title: Imprint of Explosion Mechanism on Supernova Relic Neutrinos

abstract:
  The spectrum and event rate of supernova relic neutrinos are calculated
taking into account the dependence on the time it takes for the shock wave in
supernova cores to revive. The shock revival time should depend on the still
unknown explosion mechanism of collapse-driven supernovae. The contribution of
black-hole-forming failed supernovae is also considered. The total event rate
is higher for models with a longer shock revival time and/or a failed-supernova
contribution. The hardness of the spectrum does not strongly depend on the
shock revival time, but the spectrum becomes hard owing to the failed
supernovae. Therefore, the shock-revival-time dependence of supernova relic
neutrinos has different systematics from the fractions of failed supernovae.


title:
NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals,
  targets, procedures and first results

abstract:
  The discovery and subsequent detailed study of T dwarfs has provided many
surprises and pushed the physics and modeling of cool atmospheres in
unpredicted directions. Distance is a critical parameter for studies of these
objects to determine intrinsic luminosities, test binarity and measure their
motion in the Galaxy. We describe a new observational program to determine
distances across the full range of T dwarf sub-types using the NTT/SOFI
telescope/instrument combination. We present preliminary results for ten
objects, five of which represent new distances.


title: Fluorine abundances and the puzzle of globular cluster chemical history

abstract:
  The abundance of fluorine in a few Galactic globular clusters is known to
strongly vary from star-to-star. These unexpected chemical properties are an
additional confirmation of the chemical inhomogeneities already found in
several GC, and probably caused by the first generations of stars formed in
these systems. The aim of this article is to complement our understanding of
the F-behaviour in GC stars and to look for new constraints on the formation
histories of their multiple stellar populations. We have collected near-IR
spectra of 15 RGB stars belonging to GC spanning a wide range of metallicity:
47 Tuc, M4, NGC6397 and M30. F, Na and Fe abundances have been estimated by
spectral synthesis. No anticorrelation between F and Na abundances are found
for the most metal-rich cluster of the sample (47 Tuc). In this GC, RGB stars
indeed exhibit rather small differences in [F/Fe] unlike the larger ones found
for the [Na/Fe] ratios. This reveals a rather inhomogeneous stellar system and
a complex chemical evolution history for 47 Tuc . In M4, one star of our study
confirms the previous Na-F distribution reported by another group in 2005. For
the two very metal-poor GC (NGC6397 and M30), only upper limits of F abundances
have been derived. We show that F abundances could be estimated in such
metal-poor GC with current telescopes and spectrographs only if unexpected
F-rich giants are found and/or exceptional observational conditions are met.
The distribution of the F and Na abundances in GC reveal that their RGB members
seem to belong to two well-separated regions. All the RGB stars analysed so far
in the different GC are indeed found to be either F-rich Na-poor or F-poor
Na-rich. Such well-separated bimodal regimes are consistent with the separate
formation episodes suspected in most galactic GC.


title:
Conditional Least Squares and Copulae in Claims Reserving for a Single
  Line of Business

abstract:
  One of the main goals in non-life insurance is to estimate the claims reserve
distribution. A generalized time series model, that allows for modeling the
conditional mean and variance of the claim amounts, is proposed for the claims
development. On contrary to the classical stochastic reserving techniques, the
number of model parameters does not depend on the number of development
periods, which leads to a more precise forecasting.
  Moreover, the time series innovations for the consecutive claims are not
considered to be independent anymore. Conditional least squares are used for
model parameter estimation and consistency of such estimate is proved. Copula
approach is used for modeling the dependence structure, which improves the
precision of the reserve distribution estimate as well.
  Real data examples are provided as an illustration of the potential benefits
of the presented approach.


title:
Status of $Y=0$ Triplet Higgs with supersymmetry in the light of $\sim
  125$ GeV Higgs discovery

abstract:
  We study the $Y=0$ triplet extended supersymmetric model in the light of the
recent Higgs boson discovery. We calculate full one loop Higgs mass spectrum in
this model where the possible doublet-triplet mixing is considered in the
charged Higgs sector. This mixing changes the prediction of
$\mathcal{B}r(B_s\to X_s \gamma)$ in this model, compared to the MSSM. The
constraints from the $\sim 125$ GeV Higgs along with $\mathcal{B}r(B_s\to X_s
\gamma)$ are incorporated to find out the allowed parameter space. The lower
bounds on the third generation squark masses coming from 125 GeV Higgs are
rather week in this scenario compared to most constrained supersymmetric
scenarios, e.g. a 200 GeV squark mass is still possible.


title:
Generalized Kraus Operators and Generators of Quantum Dynamical
  Semigroups

abstract:
  Quantum dynamical semigroups play an important role in the description of
physical processes such as diffusion, radiative decay or other non-equilibrium
events. Taking strongly continuous and trace preserving semigroups into
consideration, we show that, under a special criterion, the generator of such a
group admits a certain generalized standard form, thereby shedding new light on
known approaches in this direction. Furthermore, we illustrate our analysis in
concrete examples.


title: Verifying the Steane code with Quantomatic

abstract:
  In this paper we give a partially mechanized proof of the correctness of
Steane's 7-qubit error correcting code, using the tool Quantomatic. To the best
of our knowledge, this represents the largest and most complicated verification
task yet carried out using Quantomatic.


title:
Interrelations between different canonical descriptions of dissipative
  systems

abstract:
  There are many approaches for the description of dissipative systems coupled
to some kind of environment. This environment can be described in different
ways; only effective models will be considered here. In the Bateman model, the
environment is represented by one additional degree of freedom and the
corresponding momentum. In two other canonical approaches, no environmental
degree of freedom appears explicitly but the canonical variables are connected
with the physical ones via non-canonical transformations. The link between the
Bateman approach and those without additional variables is achieved via
comparison with a canonical approach using expanding coordinates since, in this
case, both Hamiltonians are constants of motion. This leads to constraints that
allow for the elimination of the additional degree of freedom in the Bateman
approach. These constraints are not unique. Several choices are studied
explicitly and the consequences for the physical interpretation of the
additional variable in the Bateman model are discussed.


title:
Exploiting Cellular Data for Disease Containment and Information
  Campaigns Strategies in Country-Wide Epidemics

abstract:
  Human mobility is one of the key factors at the basis of the spreading of
diseases in a population. Containment strategies are usually devised on
movement scenarios based on coarse-grained assumptions. Mobility phone data
provide a unique opportunity for building models and defining strategies based
on very precise information about the movement of people in a region or in a
country. Another very important aspect is the underlying social structure of a
population, which might play a fundamental role in devising information
campaigns to promote vaccination and preventive measures, especially in
countries with a strong family (or tribal) structure.
  In this paper we analyze a large-scale dataset describing the mobility and
the call patterns of a large number of individuals in Ivory Coast. We present a
model that describes how diseases spread across the country by exploiting
mobility patterns of people extracted from the available data. Then, we
simulate several epidemics scenarios and we evaluate mechanisms to contain the
epidemic spreading of diseases, based on the information about people mobility
and social ties, also gathered from the phone call data. More specifically, we
find that restricting mobility does not delay the occurrence of an endemic
state and that an information campaign based on one-to-one phone conversations
among members of social groups might be an effective countermeasure.


title: The remarkable discreteness of being

abstract:
  Life is a discrete, stochastic phenomena : for a biological organism, the
time of the two most important events of its life (reproduction and death) is
random and these events change the number of individuals of the species by
single units. These facts can have surprising, counter-intuitive consequences.
I review here three examples where these facts play, or could play, important
roles : the spatial distribution of species, the biodiversity and the
(Darwinian) evolution of altruistic behavior.


title: Spanning forests in regular planar maps

abstract:
  We address the enumeration of p-valent planar maps equipped with a spanning
forest, with a weight z per face and a weight u per connected component of the
forest. Equivalently, we count p-valent maps equipped with a spanning tree,
with a weight z per face and a weight \mu:=u+1 per internally active edge, in
the sense of Tutte; or the (dual) p-angulations equipped with a recurrent
sandpile configuration, with a weight z per vertex and a variable \mu:=u+1 that
keeps track of the level of the configuration. This enumeration problem also
corresponds to the limit q -> 0 of the q-state Potts model on p-angulations.
Our approach is purely combinatorial. The associated generating function,
denoted F(z,u), is expressed in terms of a pair of series defined implicitly by
a system involving doubly hypergeometric series. We derive from this system
that F(z,u) is differentially algebraic in z, that is, satisfies a differential
equation in z with polynomial coefficients in z and u. This has recently been
proved to hold for the more general Potts model on 3-valent maps, but via a
much more involved and less combinatorial proof. For u >= -1, we study the
singularities of F(z,u) and the corresponding asymptotic behaviour of its n-th
coefficient. For u>0, we find the standard asymptotic behaviour of planar maps,
with a subexponential term in n^{-5/2}. At u=0 we witness a phase transition
with a term n^{-3}. When u\in[-1,0), we obtain an extremely unusual behaviour
in n^{-3}(\ln n)^{-2}. To our knowledge, this is a new "universality class" for
planar maps.


title: Classification of eclipsing binaries: attractive systems

abstract:
  We have compiled a catalogue of eclipsing variable stars, the largest
catalogue, containing classified eclipsing binaries. A procedure for the
classification of eclipsing binaries, based on the catalogued data, is also
developed. It was applied to unclassified eclipsing binaries. In this paper we
discuss eclipsing binaries, which can not be classified with the procedure.
Some of them belong to marginal evolutionary classes. Observational data for
others are too contradictory, and additional observations are needed to
attribute them to one or another evolutionary class.


title:
Performance of Geant4 in simulating semiconductor particle detector
  response in the energy range below 1 MeV

abstract:
  Geant4 simulations play a crucial role in the analysis and interpretation of
experiments providing low energy precision tests of the Standard Model. This
paper focuses on the accuracy of the description of the electron processes in
the energy range between 100 and 1000 keV. The effect of the different
simulation parameters and multiple scattering models on the backscattering
coefficients is investigated. Simulations of the response of HPGe and
passivated implanted planar Si detectors to \beta{} particles are compared to
experimental results. An overall good agreement is found between Geant4
simulations and experimental data.


title:
Volume-Preserving flow by powers of the mth mean curvature in the
  hyperbolic space

abstract:
  This paper concerns closed hypersurfaces of dimension $n(\geq 2)$ in the
hyperbolic space ${\mathbb{H}}_{\kappa}^{n+1}$ of constant sectional curvature
$\kappa$ evolving in direction of its normal vector, where the speed is given
by a power $\beta (\geq 1/m)$ of the $m$th mean curvature plus a volume
preserving term, including the case of powers of the mean curvature and of the
$\mbox{Gau\ss}$ curvature. The main result is that if the initial hypersurface
satisfies that the ratio of the biggest and smallest principal curvature is
close enough to 1 everywhere, depending only on $n$, $m$, $\beta$ and $\kappa$,
then under the flow this is maintained, there exists a unique, smooth solution
of the flow for all times, and the evolving hypersurfaces exponentially
converge to a geodesic sphere of ${\mathbb{H}}_{\kappa}^{n+1}$, enclosing the
same volume as the initial hypersurface.


title: M dwarf catalog of LAMOST pilot survey

abstract:
  We present a spectroscopic catalog of 67082 M dwarfs from the LAMOST pilot
survey. For each spectrum of the catalog, spectral subtype, radial velocity,
equivalent width of H${\alpha}$, a number of prominent molecular band indices
and the metal sensitive parameter $\zeta$ are provided . Spectral subtype have
been estimated by a remedied Hammer program (Original Hammer: Covey et al.
2007), in which indices are reselected to obtain more accurate auto-classified
spectral subtypes. All spectra in this catalog have been visually inspected to
confirm the spectral subtypes. Radial velocities have been well measured by our
developed program which uses cross-correlation method and estimates uncertainty
of radial velocity as well. We also examine the magnetic activity properties of
M dwarfs traced by H${\alpha}$ emission line. The molecular band indices
included in this catalog are temperature or metallicity sensitive and can be
used for future analysis of the physical properties of M dwarfs. The catalog is
available on the website \url{http://sciwiki.lamost.org/MCatalogPilot/}.


title:
Prediction of turbulence control for arbitrary periodic spanwise wall
  movement

abstract:
  In order to generalize the well-known spanwise-oscillating-wall technique for
drag reduction, non-sinusoidal oscillations of a solid wall are considered as a
means to alter the skin-friction drag in a turbulent channel flow. A series of
Direct Numerical Simulations is conducted to evaluate the control performance
of nine different temporal waveforms, in addition to the usual sinusoid,
systematically changing the wave amplitude and the period for each waveform.
  The turbulent average spanwise motion is found to coincide with the laminar
Stokes solution that is constructed, for the generic waveform, through harmonic
superposition. This allows us to define and compute, for each waveform, a new
penetration depth of the Stokes layer which correlates with the amount of
turbulent drag reduction, and eventually to predict both turbulent drag
reduction and net energy saving rate for arbitrary waveforms.
  Among the waveforms considered, the maximum net energy saving rate is
obtained by the sinusoidal wave at its optimal amplitude and period. However,
the sinusoid is not the best waveform at every point in the parameter space.
Our predictive tool offers simple guidelines to design waveforms that
outperform the sinusoid for given (suboptimal) amplitude and period of
oscillation. This is potentially interesting in view of applications, where
physical limitations often preclude the actuator to reach its optimal operating
conditions.


title: CSMA/ECA in Non-Saturation

abstract:
  During the past month we have been trying to understand both the behavior of
CSMA/ECA and how our simulator works. In this report I try to asses some of
those doubts and provide a groundwork for discussion of past and new ideas for
further develop the MAC protocol.


title: On disjunction of equations in the semigroup language with no constants

abstract:
  A semigroup $S$ is an equational domain if any finite union of algebraic sets
over $S$ is algebraic. We prove that every nontrivial semigroup in the standard
language $\{\cdot\}$ is not an equational domain.


title: Electron MHD: dynamics and turbulence

abstract:
  (Abridged) We consider dynamics and turbulent interaction of whistler modes
within the framework of inertialess electron MHD (EMHD). We argue there is no
energy principle in EMHD: any stationary closed configuration is neutrally
stable.
  We consider the turbulent cascade of whistler modes. We show that (i)
harmonic whistlers are exact non-linear solutions; (ii) co-linear whistlers do
not interact (including counter-propagating); (iii) waves with the same value
of the wave vector, $k_1=k_2$, do not interact; (iv) whistler modes have a
dispersion that allows a three-wave decay, including into a zero frequency
mode; (v) the three-wave interaction effectively couples modes with highly
different wave numbers and propagation angles. In addition, linear interaction
of a whistler with a single zero-mode can lead to spatially divergent
structures via parametric instability. All these properties are drastically
different from MHD, so that the qualitative properties of the Alfven turbulence
cannot be transferred to the EMHD turbulence.
  We derive the Hamiltonian formulation of EMHD, and using Bogolyubov
transformation reduce it to the canonical form; we calculate the matrix
elements for the three-wave interaction of whistlers. We solve numerically the
kinetic equation and show that, generally, the EMHD cascade develops within a
broad range of angles, while transiently it may show anisotropic, nearly two
dimensional structures. Development of a cascade depends on the forcing
(non-universal) and often fails to reach a steady state. Analytical estimates
predict the spectrum of magnetic fluctuations for the quasi-isotropic cascade
$\propto k^{-2}$. The cascade remains weak (not critically-balanced). The
cascade is UV-local, while the infrared locality is weakly (logarithmically)
violated.


title: On disjunction of equations in inverse semigroups

abstract:
  A semigroup $S$ is an equational domain if any finite union of algebraic sets
over $S$ is algebraic. We prove that if an inverse semigroup $S$ is an
equational domain in the extended language $\{\cdot,{}^{-1}\}\cup\{s|s\in S\}$
then $S$ is a group.


title: Dynamic Code Coverage with Progressive Detail Levels

abstract:
  Nowadays, locating software components responsible for observed failures is
one of the most expensive and error-prone tasks in the software development
process. To improve the debugging process efficiency, some effort was already
made to automatically assist the detection and location of software faults.
This led to the creation of statistical debugging tools such as Tarantula,
Zoltar and GZoltar. These tools use information gathered from code coverage
data and the result of test executions to return a list of potential faulty
locations. Although helpful, fault localization tools have some scaling
problems because of the fine-grained coverage data they need to perform the
fault localization analysis. Instrumentation overhead, which in some cases can
be as high as 50% is the main cause for their inefficiency. This thesis
proposes a new approach to this problem, avoiding as much as possible the high
level of coverage detail, while still using the proven techniques these fault
localization tools employ. This approach, named DCC, consists of using a
coarser initial instrumentation, obtaining only coverage traces for large
components. Then, the instrumentation detail of certain components is
progressively increased, based on the intermediate results provided by the same
techniques employed in current fault localization tools. To assess the validity
of our proposed approach, an empirical evaluation was performed, injecting
faults in four real-world software projects. The empirical evaluation
demonstrates that the DCC approach reduces the execution overhead that exists
in spectrum-based fault localization, and even presents a more concise
potential fault ranking to the user. We have observed execution time reductions
of 27% on average and diagnostic report size reductions of 63% on average.


title: On disjunction of equations in completely regular semigroups

abstract:
  A semigroup $S$ is called an equational domain if any finite union of
algebraic sets over $S$ is algebraic. We prove if a completely regular
semigroup $S$ is an equational domain then $S$ is completely simple.


title:
Hypocoercive relaxation to equilibrium for some kinetic models via a
  third order differential inequality

abstract:
  This paper deals with the study of some particular kinetic models, where the
randomness acts only on the velocity variable level. Usually, the Markovian
generator cannot satisfy any Poincar\'e's inequality. Hence, no Gronwall's
lemma can easily lead to the exponential decay of Ft (the L2 norm of a test
function along the semi-group). Nevertheless for the kinetic Fokker-Planck
dynamics and for a piecewise deterministic evolution we show that Ft satisfies
a third order differential inequality which gives an explicit rate of
convergence to equilibrium.


title:
Sigma-Delta quantization of sub-Gaussian frame expansions and its
  application to compressed sensing

abstract:
  Suppose that the collection $\{e_i\}_{i=1}^m$ forms a frame for $\R^k$, where
each entry of the vector $e_i$ is a sub-Gaussian random variable. We consider
expansions in such a frame, which are then quantized using a Sigma-Delta
scheme. We show that an arbitrary signal in $\R^k$ can be recovered from its
quantized frame coefficients up to an error which decays root-exponentially in
the oversampling rate $m/k$. Here the quantization scheme is assumed to be
chosen appropriately depending on the oversampling rate and the quantization
alphabet can be coarse. The result holds with high probability on the draw of
the frame uniformly for all signals. The crux of the argument is a bound on the
extreme singular values of the product of a deterministic matrix and a
sub-Gaussian frame. For fine quantization alphabets, we leverage this bound to
show polynomial error decay in the context of compressed sensing. Our results
extend previous results for structured deterministic frame expansions and
Gaussian compressed sensing measurements.


title:
Soliton dynamics in an extended nonlinear Schrodinger equation with a
  spatial counterpart of the stimulated Raman scattering

abstract:
  Dynamics of solitons is considered in the framework of the extended nonlinear
Schrodinger equation (NLSE), which is derived from a system of Zakharov's type
for the interaction between high- and low-frequency (HF and LF) waves, in which
the LF field is subject to diffusive damping. The model may apply to the
propagation of HF waves in plasmas. The resulting NLSE includes a
pseudo-stimulated-Raman-scattering (PSRS) term, i.e., a spatial-domain
counterpart of the SRS term which is well known as an ingredient of the
temporal-domain NLSE in optics. Also included is inhomogeneity of the spatial
second-order diffraction (SOD). It is shown that the wavenumber downshift of
solitons, caused by the PSRS, may be compensated by an upshift provided by the
SOD whose coefficient is a linear function of the coordinate. An analytical
solution for solitons is obtained in an approximate form. Analytical and
numerical results agree well, including the predicted balance between the PSRS
and the linearly inhomogeneous SOD.


title: False vacuum as an unstable state: possible cosmological implications

abstract:
  Recent LHC results concerning the mass of the Higgs boson indicate that the
vacuum in our Universe may be unstable. We analyze properties of unstable
vacuum states from the point of view of the quantum theory of unstable states.
From the literature it is known that some of false vacuum states may survive up
to times when their survival probability has a non-exponential form. At times
much latter than the transition time, when contributions to the survival
probability of its exponential and non-exponential parts are comparable, the
survival probability as a function of time $t$ has an inverse power-like form.
We show that at this time region the instantaneous energy of the false vacuum
states tends to the energy of the true vacuum state as $1/t^{2}$ for $t \to
\infty$. Properties of the instantaneous energy at transition times are also
analyzed for a given model. It is shown that at this time region large and
rapid fluctuations of the instantaneous energy take place. This suggests
analogous behavior of the cosmological constant at these time regions.


title: A Novel Lowest Density MDS Array Code

abstract:
  In this paper we introduce a novel MDS array code with lowest density. In
contrast to existing codes, this one has no restrictions on the size or the
number of erasures it can correct. It is based on a simple matrix construction
involving totally nonsingular matrices. We also introduce a simple decoding
algorithm based on the structure of the code.


title: Recognizable classification of Lorentzian distance-squared mappings

abstract:
  The Lorentzian length, which is one of the most significant functions in
Lorentzian geometry, is a complex-valued function. Its square gives a
real-valued non-degenerate quadratic function. In this paper, we define
naturally extended mappings of Lorentzian distance-squared functions, wherein
each component is a Lorentzian distance-squared function; and classify these
mappings completely by the likeness of recognition subspaces.


title: Control of the flow behind a backward-facing step by visual feedback

abstract:
  The separated flow downstream a backward-facing step is controlled using
visual information for feedback. This is done when looking at the flow from two
vantage points. Flow velocity fields are computed in real-time and used to
yield inputs to a control loop. This approach to flow control is shown to be
able to control the detached flow in the same way as has been done before by
using the area of the recirculation region downstream the step as input for a
gradient descent optimization scheme. Visual feedback using real-time
computations of 2D velocity fields also allows for novel inputs to the feedback
scheme. As a proof of concept, the spatially averaged value of the swirling
strength is successfully used as input for an automatically tuned PID
controller.


title: Photophoresis boosts giant planet formation

abstract:
  In the core accretion model of giant planet formation, a solid protoplanetary
core begins to accrete gas directly from the nebula when its mass reaches about
5 earth masses. The protoplanet has at most a few million years to reach
runaway gas accretion, as young stars lose their gas disks after 10 million
years at the latest. Yet gas accretion also brings small dust grains entrained
in the gas into the planetary atmosphere. Dust accretion creates an optically
thick protoplanetary atmosphere that cannot efficiently radiate away the
kinetic energy deposited by incoming planetesimals. A dust-rich atmosphere
severely slows down atmospheric cooling, contraction, and inflow of new gas, in
contradiction to the observed timescales of planet formation. Here we show that
photophoresis is a strong mechanism for pushing dust out of the planetary
atmosphere due to the momentum exchange between gas and dust grains. The
thermal radiation from the heated inner atmosphere and core is sufficient to
levitate dust grains and to push them outward. Photophoresis can significantly
accelerate the formation of giant planets.


title:
Long-range interactions and the sign of natural amplitudes in
  two-electron systems

abstract:
  In singlet two-electron systems the natural occupation numbers of the
one-particle reduced density matrix are given as squares of the natural
amplitudes which are defined as the expansion coefficients of the two-electron
wave function in a natural orbital basis. In this work we relate the sign of
the natural amplitudes to the nature of the two-body interaction. We show that
long-range Coulomb-type interactions are responsible for the appearance of
positive amplitudes and give both analytical and numerical examples that
illustrate how the long-distance structure of the wave function affects these
amplitudes. We further demonstrate that the amplitudes show an avoided crossing
behavior as function of a parameter in the Hamiltonian and use this feature to
show that these amplitudes never become zero, except for special interactions
in which infinitely many of them can become zero simultaneously when changing
the interaction strength. This mechanism of avoided crossings provides an
alternative argument for the non-vanishing of the natural occupation numbers in
Coulomb systems.

categories: physics.atom-ph cond-mat.str-el physics.comp-ph quant-ph


title:
Analysis of Lithium Driven Electron Density Peaking in FTU Liquid
  Lithium Limiter Experiments

abstract:
  The impact of lithium impurities on the microstability and turbulent
transport characteristics in the core of a typical FTU Liquid Lithium Limiter
(LLL)(Mazzitelli et al., Nucl. Fusion, 2011) discharge during the density
ramp-up phase is studied. A non-linear gyrokinetic analysis performed with GKW
(Peeters et al.,Comp. Phys. Comm., 2009) accompanied by a quasi-linear fluid
analysis is presented. We show that a centrally peaked, high concentration
lithium profile contributes to the electron peaking by reducing the outward
electron flux, and that it leads to inward turbulent deuterium transport
through ion flux separation.


title:
Weak amenability of locally compact quantum groups and approximation
  properties of extended quantum SU(1,1)

abstract:
  We study weak amenability for locally compact quantum groups in the sense of
Kustermans and Vaes. In particular, we focus on non-discrete examples. We prove
that a coamenable quantum group is weakly amenable if there exists a net of
positive, scaling invariant elements in the Fourier algebra A(G) whose
representing multipliers form an approximate identity in C_0(G) that is bounded
in the M_0A(G) norm; the bound being an upper estimate for the associated
Cowling-Haagerup constant.
  As an application, we find the appropriate approximation properties of the
extended quantum SU(1,1) group and its dual. That is, we prove that it is
weakly amenable and coamenable. Furthermore, it has the Haagerup property in
the quantum group sense, introduced by Daws, Fima, Skalski and White.


title: On Borel summability and analytic functionals

abstract:
  We show that a formal power series has positive radius of convergence if and
only if it is uniformly Borel summable over a circle with center at the origin.
Consequently, we obtain that an entire function $f$ is of exponential type if
and only if the formal power series $\sum_{n=0}^{\infty}f^{(n)}(0)z^{n}$ is
uniformly Borel summable over a circle centered a the origin. We apply these
results to obtain a characterization of those Silva tempered ultradistributions
which are analytic functionals. We also use Borel summability to represent
analytic functionals as Borel sums of their moment Taylor series over the Borel
polygon.


title: Stalled phase transition model of high-elastic polymer

abstract:
  The microscopic model of semi-crystalline polymer in high-elastic state is
proposed. The model is based on the assumption that, below the melting
temperature, the semi-crystalline polymer comprises crystal nuclei connected by
stretched chain segments (SCS) with random configuration of monomers. The key
factor that stalls the phase transition below the melting temperature is the
tension of the SCS. External stress applied to the polymer also shifts the
equilibrium and causes unfolding of the nuclei, which enables large reversible
deformation of the polymer without loss of integrity. The simple 1D model
predicts plateau in stress-strain curve of high-elastic polymer above the yield
stress, which agrees with experimental observations. The model prediction for
the temperature dependence of polytetrafluoroethylene (PTFE) yield stress in
high-elastic state is in satisfactory agreement with experiment.


title:
The predictability of advection-dominated flux-transport solar dynamo
  models

abstract:
  Space weather is a matter of practical importance in our modern society.
Predictions of forecoming solar cycles mean amplitude and duration are
currently being made based on flux-transport numerical models of the solar
dynamo. Interested in the forecast horizon of such studies, we quantify the
predictability window of a representative, advection-dominated, flux-transport
dynamo model by investigating its sensitivity to initial conditions and control
parameters through a perturbation analysis. We measure the rate associated with
the exponential growth of an initial perturbation of the model trajectory,
which yields a characteristic time scale known as the e-folding time $\tau_e$.
The e-folding time is shown to decrease with the strength of the
$\alpha$-effect, and to increase with the magnitude of the imposed meridional
circulation. Comparing the e-folding time with the solar cycle periodicity, we
obtain an average estimate for $\tau_e$ equal to 2.76 solar cycle durations.
From a practical point of view, the perturbations analysed in this work can be
interpreted as uncertainties affecting either the observations or the physical
model itself. After reviewing these, we discuss their implications for solar
cycle prediction.


title: Primality Test for Numbers of the Form Ap^n+w

abstract:
  We propose an algorithm determining the primality of numbers $M=Ap^n+w_n$
where $w_n^{p-1}\equiv1\pmod{p^n}$ and $A<p^n$ and give example when $p=7$. $p$
th reciprocity law is involved. The algorithm runs in polynomial time in
$\log_2(M)$ for fixed $p$ and $A$.


title:
Nonequilibrium microcanonical and canonical ensembles and their
  equivalence

abstract:
  Generalizations of the microcanonical and canonical ensembles for paths of
Markov processes have been proposed recently to describe the statistical
properties of nonequilibrium systems driven in steady states. Here we propose a
theory of these ensembles that unifies and generalizes earlier results, and
show how it is fundamentally related to the large deviation properties of
nonequilibrium systems. Using this theory, we provide conditions for the
equivalence of nonequilibrium ensembles, generalizing those found for
equilibrium systems, construct driven physical processes that generate these
ensembles, and re-derive in a simple way known and new product rules for their
transition rates. A nonequilibrium diffusion model is used to illustrate these
results.


title: Bi-twist manifolds and two-bridge knots

abstract:
  We give uniform, explicit, and simple face-pairing descriptions of all the
branched cyclic covers of the 3-sphere, branched over two-bridge knots. Our
method is to use the bi-twisted face-pairing constructions of Cannon, Floyd,
and Parry; these examples show that the bi-twist construction is often
efficient and natural. Finally, we give applications to computations of
fundamental groups and homology of these branched cyclic covers.


title:
Three-dimensional Dirac fermions in quasicrystals as seen via optical
  conductivity

abstract:
  The optical conductivity of quasicrystals is characterized by two features
not seen in ordinary metallic systems. There is an absence of the Drude peak
and the interband conductivity rises linearly from a very low value up to
normal metallic levels over a wide range of frequencies. The absence of a Drude
peak has been attributed to a pseudogap at the Fermi surface but a detailed
explanation of the linear behavior has not been found. Here we show that the
linear conductivity, which seems to be universal in all Al based icosahedral
quasicrystal families, as well as their periodic approximants, follows from a
simple model that assumes that the entire Fermi surface is gapped except at a
finite set of Dirac points. There is no evidence of a semiconducting gap in any
of the materials suggesting that the Dirac spectrum is massless, protected by
topology leading to a Weyl semimetal. This model gives rise to a linear
conductivity with only one parameter, the Fermi velocity. This picture suggests
that decagonal quasicrystals should, like graphene, have a frequency
independent conductivity, without a Drude peak. This is in accord with the
experimental data as well.


title:
Surface tension model for surfactant solutions at the critical micelle
  concentration

abstract:
  A model for the limiting surface tension of surfactant solutions (surface
tension at and above the critical micelle concentration, cmc) was developed.
This model takes advantage of the equilibrium between the surfactant molecules
on the liquid/vacuum surface and in micelles in the bulk at the cmc. An
approximate analytical equation for the surface tension at the cmc was
obtained. The derived equation contains two parameters, which characterize the
intermolecular interactions in the micelles, and the third parameter, which is
the surface area per surfactant molecule at the interface. These parameters
were calculated using a new atomistic modeling approach. The performed
calculations of the limiting surface tension for four simple surfactants show
good agreement with experimental data (~30% accuracy). The developed model
provides the guidance for design of surfactants with low surface tension
values.


title:
Constraining a Model of Turbulent Coronal Heating for AU Microscopii
  with X-Ray, Radio, and Millimeter Observations

abstract:
  Many low-mass pre-main-sequence stars exhibit strong magnetic activity and
coronal X-ray emission. Even after the primordial accretion disk has been
cleared out, the star's high-energy radiation continues to affect the formation
and evolution of dust, planetesimals, and large planets. Young stars with
debris disks are thus ideal environments for studying the earliest stages of
non-accretion-driven coronae. In this paper we simulate the corona of AU Mic, a
nearby active M dwarf with an edge-on debris disk. We apply a self-consistent
model of coronal loop heating that was derived from numerical simulations of
solar field-line tangling and magnetohydrodynamic turbulence. We also
synthesize the modeled star's X-ray luminosity and thermal radio/millimeter
continuum emission. A realistic set of parameter choices for AU Mic produces
simulated observations that agree with all existing measurements and upper
limits. This coronal model thus represents an alternative explanation for a
recently discovered ALMA central emission peak that was suggested to be the
result of an inner "asteroid belt" within 3 AU of the star. However, it is also
possible that the central 1.3 mm peak is caused by a combination of active
coronal emission and a bright inner source of dusty debris. Additional
observations of this source's spatial extent and spectral energy distribution
at millimeter and radio wavelengths will better constrain the relative
contributions of the proposed mechanisms.


title:
Spin-Orbit Coupling Induced Coherent Production of Feshbach Molecules in
  a Degenerate Fermi Gas

abstract:
  In this work we demonstrate a dynamic process in which SO coupling can
coherently produce s-wave Feshbach molecules from a fully polarized Fermi gas,
and can induce a coherent oscillation between Feshbach molecules and spin
polarized gas. For comparison, we also show that such phenomena are absent if
the inter-component coupling is momentum-independent. This demonstrates
experimentally that SO coupling does provide finite matrix element between a
singlet state and a triplet state, and therefore, implies the bound pairs of a
system with SO coupling have triplet p-wave component, which can become
topological superfluid by further cooling these pairs to condensation and
confining them to lower dimension.


title:
Power requirements for electron cyclotron current drive and ion
  cyclotron resonance heating for sawtooth control in ITER

abstract:
  13MW of electron cyclotron current drive (ECCD) power deposited inside the q
= 1 surface is likely to reduce the sawtooth period in ITER baseline scenario
below the level empirically predicted to trigger neo-classical tearing modes
(NTMs). However, since the ECCD control scheme is solely predicated upon
changing the local magnetic shear, it is prudent to plan to use a complementary
scheme which directly decreases the potential energy of the kink mode in order
to reduce the sawtooth period. In the event that the natural sawtooth period is
longer than expected, due to enhanced alpha particle stabilisation for
instance, this ancillary sawtooth control can be provided from > 10MW of ion
cyclotron resonance heating (ICRH) power with a resonance just inside the q = 1
surface. Both ECCD and ICRH control schemes would benefit greatly from active
feedback of the deposition with respect to the rational surface. If the q = 1
surface can be maintained closer to the magnetic axis, the efficacy of ECCD and
ICRH schemes significantly increases, the negative effect on the fusion gain is
reduced, and off-axis negative-ion neutral beam injection (NNBI) can also be
considered for sawtooth control. Consequently, schemes to reduce the q = 1
radius are highly desirable, such as early heating to delay the current
penetration and, of course, active sawtooth destabilisation to mediate small
frequent sawteeth and retain a small q = 1 radius.


title:
Euclidean hypersurfaces with a totally geodesic foliation of codimension
  one

abstract:
  We classify the hypersurfaces of Euclidean space that carry a totally
geodesic foliation with complete leaves of codimension one. In particular, we
show that rotation hypersurfaces with complete profiles of codimension one are
characterized by their warped product structure. The local version of the
problem is also considered.


title:
Cohomological, Poisson structures and integrable hierarchies in
  tautological subbundles for Birkhoff strata of Sato Grassmannian

abstract:
  Cohomological and Poisson structures associated with the special tautological
subbundles $TB_{W_{1,2,\dots,n}}$ for the Birkhoff strata of Sato Grassmannian
are considered. It is shown that the tangent bundles of $TB_{W_{1,2,\dots,n}}$
are isomorphic to the linear spaces of $2-$coboundaries with vanishing
Harrison's cohomology modules. Special class of 2-coboundaries is provided by
the systems of integrable quasilinear PDEs. For the big cell it is the dKP
hierarchy. It is demonstrated also that the families of ideals for algebraic
varieties in $TB_{W_{1,2,\dots,n}}$ can be viewed as the Poisson ideals. This
observation establishes a connection between families of algebraic curves in
$TB_{W_{\hat{S}}}$ and coisotropic deformations of such curves of zero and
nonzero genus described by hierarchies of hydrodynamical type systems like dKP
hierarchy. Interrelation between cohomological and Poisson structures is noted.


title: The Dynamics of Platinum Precipitation in an Ion Exchange Membrane

abstract:
  Microscopy of polymer electrolyte membranes that have undergone operation
under fuel cell conditions, have revealed a well defined band of platinum in
the membrane. Here, we propose a physics based model that captures the
mechanism of platinum precipitation in the polymer electrolyte membrane. While
platinum is observed throughout the membrane, the preferential growth of
platinum at the band of platinum is dependent on the electrochemical potential
distribution in the membrane. In this paper, the location of the platinum band
is calculated as a function of the gas concentration at the cathode and anode,
gas diffusion coefficients and solubility constants of the gases in the
membrane, which are functions of relative humidity. Under H2/N2 conditions the
platinum band is located near the cathode-membrane interface, as the oxygen
concentration in the cathode gas stream increases and/or the hydrogen
concentration in the anode gas stream decreases, the band moves towards the
anode. The model developed in this paper agrees with the set of experimental
data on the platinum band location and the platinum particle distribution and
size.


title:
Good interlaced polynomial lattice rules for numerical integration in
  weighted Walsh spaces

abstract:
  Quadrature rules using higher order digital nets and sequences are known to
exploit the smoothness of a function for numerical integration and to achieve
an improved rate of convergence as compared to classical digital nets and
sequences for smooth functions. A construction principle of higher order
digital nets and sequences based on a digit interlacing function was introduced
in [J. Dick, SIAM J. Numer. Anal., 45 (2007) pp.~2141--2176], which interlaces
classical digital nets or sequences whose number of components is a multiple of
the dimension.
  In this paper, we study the use of polynomial lattice point sets for
interlaced components. We call quadrature rules using such point sets {\em
interlaced polynomial lattice rules}. We consider weighted Walsh spaces
containing smooth functions and derive two upper bounds on the worst-case error
for interlaced polynomial lattice rules, both of which can be employed as a
quality criterion for the construction of interlaced polynomial lattice rules.
We investigate the component-by-component construction and the Korobov
construction as a means of explicit constructions of good interlaced polynomial
lattice rules that achieve the optimal rate of the worst-case error. Through
this approach we are able to obtain a good dependence of the worst-case error
bounds on the dimension under certain conditions on the weights, while
significantly reducing the construction cost as compared to higher order
polynomial lattice rules.


title:
Search for axioelectric effect of 5.5 MeV solar axions using BGO
  detectors

abstract:
  A search for axioelectric absorption of solar axions produced in the $ p + d
\rightarrow {^3\rm{He}}+\gamma (5.5 \rm{MeV})$ reactions has been performed
with a BGO detector placed in a low-background setup. A model-independent limit
on an axion-nucleon and axion-electron coupling constant has been obtained: $|
g_{Ae}\times g_{AN}^3|< 2.9\times 10^{-9}$ for 90% confidence level. The
constrains of the axion-electron coupling have been obtained for hadronic axion
with masses in (0.1 - 1) MeV range: $|g_{Ae}| \leq (1.4 - 9.7)\times 10^{-7}$.


title:
A Mathematical Model for Predicting the Life of PEM Fuel Cell Membranes
  Subjected to Hydration Cycling

abstract:
  Under typical PEM fuel cell operating conditions, part of membrane electrode
assembly is subjected to humidity cycling due to variation of inlet gas RH
and/or flow rate. Cyclic membrane hydration/dehydration would cause cyclic
swelling/shrinking of the unconstrained membrane. In a constrained membrane, it
causes cyclic stress resulting in mechanical failure in the area adjacent to
the gas inlet. A mathematical modeling framework for prediction of the lifetime
of a PEM FC membrane subjected to hydration cycling is developed in this paper.
The model predicts membrane lifetime as a function of RH cycling amplitude and
membrane mechanical properties. The modeling framework consists of three model
components: a fuel cell RH distribution model, a hydration/dehydration induced
stress model that predicts stress distribution in the membrane, and a damage
accrual model that predicts membrane life-time. Short descriptions of the model
components along with overall framework are presented in the paper. The model
was used for lifetime prediction of a GORE-SELECT membrane.


title: Quantum Discord for Generalized Bloch Sphere States

abstract:
  In this study for particular states of bipartite quantum system in 2n?2m
dimensional Hilbert space state, similar to m or n-qubit density matrices
represented in Bloch sphere we call them generalized Bloch sphere states(GBSS),
we give an efficient optimization procedure so that analytic evaluation of
quantum discord can be performed. Using this optimization procedure, we find an
exact analytical formula for the optimum positive operator valued measure
(POVM) that maximize the measure of the classical correlation for these states.
The presented optimization procedure also is used to show that for any concave
entropy function the same POVMs are sufficient for quantum discord of mentioned
states. Furthermore, We show that such optimization procedure can be used to
calculate the geometric measure of quantum discord (GMQD) and then an explicit
formula for GMQD is given. Finally, a complete geometric view is presented for
quantum discord of GBSS. Keywords: Quantum Discord, Generalized Bloch Sphere
States, Dirac matrices, Bipartite Quantum System. PACs Index: 03.67.-a,
03.65.Ta, 03.65.Ud


title:
The Impact of Thermal Conductivity and Diffusion Rates on Water Vapor
  Transport through Gas Diffusion Layers

abstract:
  Water management in a hydrogen polymer electrolyte membrane (PEM) fuel cell
is critical for performance. The impact of thermal conductivity and water vapor
diffusion coefficients in a gas diffusion layer (GDL) has been studied by a
mathematical model. The fraction of product water that is removed in the vapour
phase through the GDL as a function of GDL properties and operating conditions
has been calculated and discussed. Furthermore, the current model enables
identification of conditions when condensation occurs in each GDL component and
calculation of temperature gradient across the interface between different
layers, providing insight into the overall mechanism of water transport in a
given cell design. Water transport mode and condensation conditions in the GDL
components depend on the combination of water vapor diffusion coefficients and
thermal conductivities of the GDL components. Different types of GDL and water
removal scenarios have been identified and related to experimentally-determined
GDL properties.


title: Exit spaces for Cox processes and the P\'olya sum process

abstract:
  For Cox processes we construct a Markov process with increasing paths to
couple the condensations of the Cox process in a monotone way. A similar
procedure procedure yields an analogue Markov process for the P\'olya sum
process. Moreover, we identify the exit spaces of these Markov processes and
identify them firstly as mixtures of certain extremal processes, i.e. as a
process in a random environment, and secondly as Gibbs processes.


title: On the number of minimal models of a log smooth threefold

abstract:
  We give a topological bound on the number of minimal models of a class of
three dimensional log smooth pairs of general type.


title: Space Charge Transfer in Hybrid Inorganic/Organic Systems

abstract:
  We discuss density functional theory calculations of hybrid inorganic/organic
systems (HIOS) that explicitly include the global effects of doping (i.e.
position of the Fermi level) and the formation of a space-charge layer. For the
example of tetrafluoro-tetracyanoquinodimethane (F4TCNQ) on the
ZnO(000$\bar{1}$) surface we show that the adsorption energy and electron
transfer depend strongly on the ZnO doping. The associated work function
changes are large, for which the formation of space-charge layers is the main
driving force. The prominent doping effects are expected to be quite general
for charge-transfer interfaces in HIOS and important for device design.


title: Heavy-quark mass effects in Higgs boson production at the LHC

abstract:
  We study the impact of heavy-quark masses in Higgs boson production through
gluon fusion at the LHC. We extend previous computations of the fully
differential cross section and of the transverse momentum spectrum of the Higgs
boson by taking into account the finite top- and bottom-quark masses up to
O(alpha_S^3). We also discuss the issues arising when the heavy-quark mass is
much smaller than the Higgs mass. Our results are implemented in updated
versions of the HNNLO and HRes numerical programs.


title:
A hydrodynamic limit and fluctuations for a Chinese restaurant-like
  process

abstract:
  We study a Markov process constructed from the P\'olya sum process, which
yields a kind of spatial version of the Chinese restaurant process, where each
'table' is assigned a 'location'. This construction firstly allows a definition
of summation of independent processes, and secondly a monotone coupling for
different parameters. Moreover, the process is related to a multi-particle
random walk on the positive integers and its hydrodynamic limit and
fluctuations are discussed.


title:
Double criticality in the magnetic field-driven transition of a high-TC
  superconductor

abstract:
  Driving a two-dimensional superconductor normal by applying a high magnetic
field may lead to Cooper pair localization. In this case, there should be a
quantum critical point associated with specific scaling laws. Such a transition
has been evidenced in a number of low critical temperature superconducting thin
films and has been suggested to occur also in high temperature cuprate
superconductors. Here we show experimental evidence for two distinct quantum
critical regimes when applying perpendicular magnetic fields to underdoped
La2-xSrxCuO4 thin films. At intermediate values of the magnetic field
(18T-20T), a "ghost" QCP is observed, for which the values of the related
critical exponents point towards a fermionic -as opposed to bosonic- scenario.
At higher (about 37 T) magnetic field, another QCP is observed, which suggests
the existence of either a 2D/3D or a clean/dirty temperature crossover.


title: Topology Change and Tensor Forces for the EoS of Dense Baryonic Matter

abstract:
  When skyrmions representing nucleons are put on crystal lattice and
compressed to simulate high density, there is a transition above the normal
nuclear matter density $n_0$ from a matter consisting of skyrmions with integer
baryon charge to a state of half-skyrmions with half-integer baryon charge. We
exploit this observation in an effective field theory formalism to access dense
baryonic system. We find that the topology change involved implies a changeover
from a Fermi liquid structure to a non-Fermi liquid with the chiral condensate
in the nucleon "melted off." The $\sim 80%$ of the nucleon mass that remains,
invariant under chiral transformation, points to the origin of the (bulk of)
proton mass that is not encoded in the standard mechanism of spontaneously
broken chiral symmetry. The topology change engenders a drastic modification of
the nuclear tensor forces, thereby nontrivially affecting the EoS, in
particular, the symmetry energy, for compact star matter. It brings in
stiffening of the EoS needed to accommodate a neutron star of $\sim 2$ solar
mass. The strong effect on the EoS in general and in the tensor force structure
in particular will also have impact on processes that could be measured at
RIB-type accelerators.


title:
GRB 081007 and GRB 090424: the surrounding medium, outflows and
  supernovae

abstract:
  We discuss the results of the analysis of multi-wavelength data for the
afterglows of GRB 081007 and GRB 090424, two bursts detected by Swift. One of
them, GRB 081007, also shows a spectroscopically confirmed supernova, SN
2008hw, which resembles SN 1998bw in its absorption features, while the maximum
luminosity is only about half as large as that of SN 1998bw. Bright optical
flashes have been detected in both events, which allows us to derive solid
constraints on the circumburst-matter density profile. This is particularly
interesting in the case of GRB 081007, whose afterglow is found to be
propagating into a constant-density medium, yielding yet another example of a
GRB clearly associated with a massive star progenitor which did not sculpt the
surroundings with its stellar wind. There is no supernova component detected in
the afterglow of GRB 090424, likely due to the brightness of the host galaxy,
comparable to the Milky Way. We show that the afterglow data are consistent
with the presence of both forward- and reverse-shock emission powered by
relativistic outflows expanding into the interstellar medium. The absence of
optical peaks due to the forward shock strongly suggests that the reverse shock
regions should be mildly magnetized. The initial Lorentz factor of outflow of
GRB 081007 is estimated to be \Gamma ~ 200, while for GRB 090424 a lower limit
of \Gamma > 170 is derived. We also discuss the prompt emission of GRB 081007,
which consists of just a single pulse. We argue that neither the external
forward-shock model nor the shock-breakout model can account for the prompt
emission data and suggest that the single-pulse-like prompt emission may be due
to magnetic energy dissipation of a Poynting-flux dominated outflow or to a
dissipative photosphere.


title:
Target Residues Formed in the Deuteron-Induced Reaction of Gold at
  Incident Energy 2.2 AGeV

abstract:
  The cross sections of 110 radioactive nuclide with mass numbers 22 < A < 198
amu from the interaction of 2.2 GeV/nucleon deuterons from the Nuclotron of the
Laboratory of High Energies (LHE), Joint Institute for Nuclear Research (JINR)
at Dubna with a 197Au target are investigated using induced activity method.
The results including charge and mass distributions are parameterized in terms
of 3-parameter equation in order to complete the real isobaric distribution.
Using data from charge distribution total mass-yield distribution was obtained.
The analysis of the mass-yield distribution allows to suppose existence of
different channels of the interaction such as spallation, deep spallation,
fission-like and multifragmentation processes.


title:
Dual Band Electrodes in Generator-Collector Mode: Simultaneous
  Measurement of Two Species

abstract:
  A computational model for the simulation of a double band collector-generator
experiment is applied to the situation where two electrochemical reactions
occur concurrently. It is shown that chronoamperometric measurements can be
used to take advantage of differences in diffusion coefficients to measure the
concentrations of both electroactive species simultaneously, by measuring the
time at which the collection efficiency reaches a specific value. The
separation of the electrodes is shown to not affect the sensitivity of the
method (in terms of percentage changes in the measured time to reach the
specified collection efficiency), but wider gaps can provide a greater range of
(larger) absolute values of this characteristic time. It is also shown that
measuring the time taken to reach smaller collection efficiencies can allow for
the detection of smaller amounts of whichever species diffuses faster. The case
of a system containing both ascorbic acid and opamine in water is used to
exemplify the method, and it is shown that mole fractions of ascorbic acid
between 0.055 and 0.96 can, in principle, be accurately measured.


title: Flavour physics in the LHC era

abstract:
  These lectures give a topical review of heavy flavour physics, in particular
\CP violation and rare decays, from an experimental point of view. They
describe the ongoing motivation to study heavy flavour physics in the LHC era,
the current status of the field emphasising key results from previous
experiments, some selected topics in which new results are expected in the near
future, and a brief look at future projects.


title: The Inherently Three-Dimensional Nature of Magnetized Plasma Turbulence

abstract:
  It is often asserted or implicitly assumed, without justification, that the
results of two-dimensional investigations of plasma turbulence are applicable
to the three-dimensional plasma environments of interest. A projection method
is applied to derive two scalar equations that govern the nonlinear evolution
of the Alfvenic and pseudo-Alfvenic components of ideal incompressible
magnetohydrodynamic (MHD) plasma turbulence. The mathematical form of these
equations makes clear the inherently three-dimensional nature of plasma
turbulence, enabling an analysis of the nonlinear properties of two-dimensional
limits often used to study plasma turbulence. In the anisotropic limit k_perp
>>k_parallel that naturally arises in magnetized plasma systems, the
perpendicular 2D limit retains the dominant nonlinearities that are mediated
only by the Alfvenic fluctuations but lacks the wave physics associated with
the linear term that is necessary to capture the anisotropic cascade of
turbulent energy. In the in-plane 2D limit, the nonlinear energy transfer is
controlled instead by the pseudo-Alfven waves, with the Alfven waves relegated
to a passive role. In the oblique 2D limit, an unavoidable azimuthal dependence
connecting the wavevector components will likely cause artificial azimuthal
asymmetries in the resulting turbulent dynamics. Therefore, none of these 2D
limits is sufficient to capture fully the rich three-dimensional nonlinear
dynamics critical to the evolution of plasma turbulence.


title: N=2 supersymmetric QCD and elliptic potentials

abstract:
  We investigate the relation between the four dimensional N=2 SU(2) super
Yang-Mills theory with four fundamental flavors and the quantum mechanics model
with Treibich-Verdier potential described by the Heun equation in the elliptic
form. We study the precise correspondence of quantities in the gauge theory and
the quantum mechanics model. An iterative method is used to obtain the
asymptotic expansion of the spectrum for the Schr\"{o}dinger operator, we are
able to fix the precise relation between the energy spectrum and the instanton
partition function of the gauge theory. We also study asymptotic expansions for
the spectrum which correspond to the strong coupling regions of the
Seiberg-Witten theory.


title: AC/DC Spin and Valley Hall Effects in Silicene and Germanene

abstract:
  The intrinsic spin and valley Hall conductivities of silicene, germanene and
other similar two dimensional crystals are explored theoretically. Particular
attention is given to the effects of the intrinsic spin-orbit coupling,
electron doping and the type of insulating phase of the system (i.e., a
topological insulator or a band insulator) which can be tuned by a
perpendicular electric field. At finite frequency, the transverse edge to which
carriers of particular spin and valley label flow can be controlled such that
an accumulation of a particular combination of spin and valley index can be
obtained. The direction of flow is found to be dependent on the type of
insulating phase. The magnitude of the Hall conductivity response is enhanced
from the DC values at certain incident photon frequencies associated with the
onset of interband transitions. Analytic results are presented for both the DC
and finite frequency results.


title:
Time Efficient Approach To Offline Hand Written Character Recognition
  Using Associative Memory Net

abstract:
  In this paper, an efficient Offline Hand Written Character Recognition
algorithm is proposed based on Associative Memory Net (AMN). The AMN used in
this work is basically auto associative. The implementation is carried out
completely in 'C' language. To make the system perform to its best with minimal
computation time, a Parallel algorithm is also developed using an API package
OpenMP. Characters are mainly English alphabets (Small (26), Capital (26))
collected from system (52) and from different persons (52). The characters
collected from system are used to train the AMN and characters collected from
different persons are used for testing the recognition ability of the net. The
detailed analysis showed that the network recognizes the hand written
characters with recognition rate of 72.20% in average case. However, in best
case, it recognizes the collected hand written characters with 88.5%. The
developed network consumes 3.57 sec (average) in Serial implementation and 1.16
sec (average) in Parallel implementation using OpenMP.


title: Field redefinition and renormalisability in scalar field theories

abstract:
  We have addressed the issue of field redefinition in connection with
renormalisability. Our study is restricted to theories of interacting scalar
fields. We have, in particular, shown that if a theory is renormalisable in the
usual power-counting sense then it remains renormalisable in the same sense
after a change of variables. This is due to the use of the powerful method of
the background field expansion. In the case of a single complex sclar field, it
turns out that the determination of the counter-terms is much simpler when
polar coordinates are used. We illustate this by carrying out a one-loop
calculation in the latter case.


title: Intersection homology of linkage spaces

abstract:
  We consider the moduli spaces $\mathcal{M}_d(\ell)$ of a closed linkage with
n links and prescribed lengths in d-dimensional Euclidean space. For d>3 these
spaces are no longer manifolds generically, but they have the structure of a
pseudomanifold. We use intersection homology to assign a ring to these spaces
that can be used to distinguish the homeomorphism type of the moduli spaces for
a large class of length vectors in the case of d even. This result is a
high-dimensional analogue of the Walker conjecture which was proven by Farber,
Hausmann and the author.


title:
An Advanced Survey on Secure Energy-Efficient Hierarchical Routing
  Protocols in Wireless Sensor Networks

abstract:
  Wireless Sensor Networks (WSNs) are often deployed in hostile environments,
which make such networks highly vulnerable and increase the risk of attacks
against this type of network. WSN comprise of large number of sensor nodes with
different hardware abilities and functions. Due to the limited memory resources
and energy constraints, complex security algorithms cannot be used in sensor
networks. Therefore, it is necessary to balance between the security level and
the associated energy consumption overhead to mitigate the security risks.
Hierarchical routing protocol is more energy-efficient than other routing
protocols in WSNs. Many secure cluster-based routing protocols have been
proposed in the literature to overcome these constraints. In this paper, we
discuss Secure Energy-Efficient Hierarchical Routing Protocols in WSNs and
compare them in terms of security, performance and efficiency. Security issues
for WSNs and their solutions are also discussed.


title: Parallelizing the Kolmogorov-Fokker-Planck Equation

abstract:
  We design the first parallel scheme based on Schwarz waveform relaxation
methods for the Kolmogorov-Fokker-Planck equation. We introduce a new
convergence proof for the algorithms. We also provide results about the
existence and uniqueness of a solution for this equation with several boundary
conditions, in order to prove that our algorithms are well-posed. Numerical
tests are also provided.


title: Infrared identification of 2XMM J191043.4+091629.4

abstract:
  Here we report the infrared identification of the X-ray source 2XMM
J191043.4+091629.4, which was detected by XMM-Newton/EPIC in the vicinity of
the Galactic supernova remnant W49B. The aim of this work is to establish the
nature of the X-ray source 2XMM J191043.4+091629.4 studying both the infrared
photometry and spectroscopy of the companion. We analyse UKIDSS images around
the best position of the X-ray source, and obtain spectra of the best candidate
using NICS in the 3.5 m TNG telescope. We present both photometric and
spectroscopic TNG analysis of the infrared counterpart of the X-ray source
identifying emission lines in the K-band. H-band spectra does not present any
significant feature. We have showed that Brackett gamma H I, at 2.165
micrometre, and He I, at 2.184 micrometre and at 2.058 micrometre, are present
significantly in the infrared spectrum. The CO bands are also not present in
our spectrum. Based on these results and the X-ray characteristics of the
source we conclude that the infrared counterpart is an early B-type supergiant
star with an E(B-V)= 7.6 +/- 0.3 at a distance of 16.0 +/- 0.5 kpc. This would
be, therefore, the first high-mass X-ray binary in the Outer Arm at galactic
longitudes between 30 and 60 degrees.


title: Analysis of roles and groups in blogosphere

abstract:
  In the paper different roles of users in social media, taking into
consideration their strength of influence and different degrees of
cooperativeness, are introduced. Such identified roles are used for the
analysis of characteristics of groups of strongly connected entities. The
different classes of groups, considering the distribution of roles of users
belonging to them, are presented and discussed.


title: Artin's criteria for algebraicity revisited

abstract:
  Using notions of homogeneity we give new proofs of M. Artin's algebraicity
criteria for functors and groupoids. Our methods give a more general result,
unifying Artin's two theorems and clarifying their differences.


title: Propagation of Tension along a Polymer Chain

abstract:
  We study the propagation of tension caused by an external force along a long
polymeric molecule in two different settings, namely along a free polymer in 3d
space being pulled from one end, and along a pre-stretched circular polymer,
confined in a narrow circular tube. We show that in both cases, the tension
propagation is governed by a diffusion equation, and in particular, the tension
front propagates as $t^{1/2}$ along the contour of the chain. The results are
confirmed numerically, and by molecular dynamics simulations in the case of the
3d polymer. We also compare our results with the previously suggested ones for
the translocation setting, and discuss why tension propagation is slower in
that case.


title: A naturally light dilaton

abstract:
  Goldstone's theorem does not apply straightforwardly to the case of
spontaneously broken scale invariance. We elucidate under what conditions a
light scalar degree of freedom, identifiable with the dilaton, can naturally
arise. Our construction can be considered an explicit dynamical solution to the
cosmological constant problem in the scalar version of gravity.


title: Electrophoresis of a DNA Coil Near a Nanopore

abstract:
  Motivated by DNA electrophoresis near a nanopore, we consider the flow field
around an "elongated jet", a long thin source which injects momentum into a
liquid. This solution qualitatively describes the electro-osmotic flow around a
long rigid polymer, where due to electrohydrodynamic coupling, the solvent
receives momentum from the electric field. Based on the qualitative behavior of
the elongated jet solution, we develop a coarse-grained scheme which reproduces
the known theoretical results regarding the electrophoretic behavior of a long
rigid polymer and a polymer coil in a uniform field, which we then exploit to
analyze the electrophoresis of a polymer coil in the non-uniform field near a
nanopore.


title: Electrophoretic Capture of a DNA Chain into a Nanopore

abstract:
  Based on our formulation of the DNA electrophoresis near a pore [P.
Rowghanian and A. Y. Grosberg, Phys. Rev. E 87, 042723 (2013)], we address the
electrophoretic DNA capture into a nanopore as a steady-state process of
particle absorption to a sink placed on top of an energy barrier. Reproducing
the previously observed diffusion-limited and barrier-limited regimes as two
different limits of the particle absorption process and matching the data, our
model suggests a slower growth of the capture rate with the DNA length for very
large DNA molecules than the previous model, motivating more experiments beyond
the current range of electric field and DNA length. At moderately weak electric
fields, our model predicts a different effect, stating that the DNA length
dependence of the capture rate first disappears as the field is reduced and
eventually reverses to a decreasing trend with $N$.


title:
Metals in the IGM approaching the re-ionization epoch: results from
  X-shooter at the VLT

abstract:
  We present the results of observations taken with the X-shooter spectrograph
devoted to the study of quasars at z ~ 6. This paper focuses on the properties
of metals at high redshift traced, in particular, by the C IV doublet
absorption systems. Six objects were observed with resolutions ~27 and 34 km/s
in the visual, and 37.5 and 53.5 km/s in the near infrared. We detected 102 C
IV lines in the range: 4.35 < z < 6.2 of which 27 are above z ~ 5. Thanks to
the characteristics of resolution and spectral coverage of X-shooter, we could
also detect 25 Si IV doublets associated with the C IV at z>5. The column
density distribution function of the C IV line sample is observed to evolve in
redshift for z>~ 5.3, with respect to the normalization defined by low redshift
(1.5 < z <4) C IV lines. This behaviour is reflected in the redshift evolution
of the C IV cosmic mass density, Omega_CIV, of lines with column density in the
range 13.4 < log N(C IV) < 15, which is consistent with a drop of a factor of
~2 for z>~ 5.3. Considering only the stronger C IV lines (13.8 < log N(CIV) <
15), Omega_CIV gently rises by a factor of ~10 between z ~ 6.2 and z~ 1.5 with
a possible flattening toward z ~ 0. The increase is well fitted by a power law:
Omega_CIV = (2+-1)x10^{-8} [(1+z)/4]^{-3.1+-0.1}. An insight into the
properties of the C IV absorbers and their evolution with redshift is obtained
by comparing the observed column densities of associated C IV, Si IV and C II
absorptions with the output of a set of CLOUDY photo-ionization models. As
already claimed by cosmological simulations, we find that C IV is a good tracer
of the metallicity in the low-density intergalacitc medium gas at z ~ 5-6 while
at z ~ 3 it arises in gas with over density delta ~100.


title:
A Measurement of the Absorption of Liquid Argon Scintillation Light by
  Dissolved Nitrogen at the Part-Per-Million Level

abstract:
  We report on a measurement of the absorption length of scintillation light in
liquid argon due to dissolved nitrogen at the part-per-million (ppm) level. We
inject controlled quantities of nitrogen into a high purity volume of liquid
argon and monitor the light yield from an alpha source. The source is placed at
different distances from a cryogenic photomultiplier tube assembly. By
comparing the light yield from each position we extract the absorption cross
section of nitrogen. We find that nitrogen absorbs argon scintillation light
with strength of $(1.51\pm 0.15)\times10^{-4} \;\mathrm{cm^{-1} ppm^{-1}}$,
corresponding to an absorption cross section of $(7.14 \pm
0.74)\times10^{-21}\;\mathrm{cm^{2} molecule^{-1}}$. We obtain the relationship
between absorption length and nitrogen concentration over the 0 to 50 ppm range
and discuss the implications for the design and data analysis of future large
liquid argon time projection chamber (LArTPC) detectors. Our results indicate
that for a current-generation LArTPC, where a concentration of 2 parts per
million of nitrogen is expected, the attenuation length due to nitrogen will be
$30 \pm 3$ meters.


title: Keyphrase Cloud Generation of Broadcast News

abstract:
  This paper describes an enhanced automatic keyphrase extraction method
applied to Broadcast News. The keyphrase extraction process is used to create a
concept level for each news. On top of words resulting from a speech
recognition system output and news indexation and it contributes to the
generation of a tag/keyphrase cloud of the top news included in a Multimedia
Monitoring Solution system for TV and Radio news/programs, running daily, and
monitoring 12 TV channels and 4 Radios.


title: Nonlinear Control of Absorption in Graphene-based 1D Photonic Crystal

abstract:
  Perfect, narrow-band absorption is achieved in an asymmetric 1D photonic
crystal with a monolayer graphene defect. Thanks to the large third order
nonlinearity of graphene and field localization in the defect layer we
demonstrate the possibility to achieve controllable, saturable absorption for
the pump frequency.


title: Hourly Traffic Prediction of News Stories

abstract:
  The process of predicting news stories popularity from several news sources
has become a challenge of great importance for both news producers and readers.
In this paper, we investigate methods for automatically predicting the number
of clicks on a news story during one hour. Our approach is a combination of
additive regression and bagging applied over a M5P regression tree using a
logarithmic scale (log10). The features included are social-based (social
network metadata from Facebook), content-based (automatically extracted
keyphrases, and stylometric statistics from news titles), and time-based. In
1st Sapo Data Challenge we obtained 11.99% as mean relative error value which
put us in the 4th place out of 26 participants.


title: The Paran\'a Ra'anga expedition

abstract:
  Paran\'a Ra'anga (the image of Paran\'a, in Guaran\'i) is the name of a
cultural and scientific expedition that traveled the rivers: R\'io de la Plata,
Paran\'a and Paraguay, from Buenos Aires to Asunci\'on, during March 2010. The
project brought together some forty scientists and artists from three countries
in a slow and enriching cruise, putting in active contact actors from different
backgrounds and disciplines -which usually run separately- in the framework of
an unusual space-time experience. The project recovers the historical tradition
of the trip as an instrument of knowledge and collaboration between the arts
and sciences, necessary to build new ways of seeing and understanding the river
and its banks. This article reports on the motivations of this project and its
projection.


title: Strongly interacting confined quantum systems in one dimension

abstract:
  In one dimension, the study of magnetism dates back to the dawn of quantum
mechanics when Bethe solved the famous Heisenberg model that describes quantum
behaviour in magnetic systems. In the last decade, one-dimensional systems have
become a forefront area of research driven by the realization of the
Tonks-Girardeau gas using cold atomic gases. Here we prove that one-dimensional
fermionic and bosonic systems with strong short-range interactions are solvable
in arbitrary confining geometries by introducing a new energy-functional
technique and obtaining the full spectrum of energies and eigenstates. As a
first application, we calculate spatial correlations and show how both ferro-
and anti-ferromagnetic states are present already for small system sizes that
are prepared and studied in current experiments. Our work demonstrates the
enormous potential for quantum manipulation of magnetic correlations at the
microscopic scale.

categories: cond-mat.quant-gas cond-mat.str-el math-ph math.MP quant-ph


title: Adiabatic preparation of vortex lattices

abstract:
  By engineering appropriate artificial gauge potentials, a Bose-Einstein
condensate can be adiabatically loaded into a current carrying state that
resembles a vortex lattice of a rotating uniform Bose gas. We give two
explicit, experimentally feasible protocols by which vortex lattices can be
smoothly formed from a condensate initially at rest. In the first example we
show how this can be achieved by adiabatically loading a uniform BEC into an
optical flux lattice, formed from coherent optical coupling of internal states
of the atom. In the second example we study a tight binding model that is
continuously manipulated in parameter space such that it smoothly transforms
into the Harper-Hofstadter model with 1/3 flux per plaquette.


title: Simple curve singularities

abstract:
  We classify simple parametrisations of complex curve singularities. Simple
means that all neighbouring singularities fall in finitely many equivalence
classes. We take the neighbouring singularities to be the ones occurring in the
versal deformation of the parametrisation. This leads to a smaller list than
that obtained by looking at the neighbours in a fixed space of multi-germs. Our
simple parametrisations are the same as the fully simple singularities of
Zhitomirskii, who classified real plane and space curve singularities. The list
of simple parametrisations of plane curves is the A-D-E list. Also for space
curves the list coincides with the lists of simple curves of Giusti and
Fr\"uhbis-Kr\"uger, in the sense of deformations of the curve. For higher
embedding dimension no classification of simple curves is available, but we
conjecture that even there the list is exactly that of curves with simple
parametrisations.


title: Effects of gauge theory based number scaling on geometry

abstract:
  Effects of local availability of mathematics (LAM) and space time dependent
number scaling on physics and, especially, geometry are described. LAM assumes
separate mathematical systems as structures at each space time point. Extension
of gauge theories to include freedom of choice of scaling for number
structures, and other structures based on numbers, results in a space time
dependent scaling factor based on a scalar boson field. Scaling has no effect
on comparison of experimental results with one another or with theory
computations. With LAM all theory expressions are elements of mathematics at
some reference point. Changing the reference point introduces (external)
scaling. Theory expressions with integrals or derivatives over space or time
include scaling factors (internal scaling) that cannot be removed by reference
point change. Line elements and path lengths, as integrals over space and/or
time, show the effect of scaling on geometry. In one example, the scaling
factor goes to 0 as the time goes to 0, the big bang time. All path lengths,
and values of physical quantities, are crushed to 0 as $t$ goes to 0. Other
examples have spherically symmetric scaling factors about some point, $x.$ In
one type, a black scaling hole, the scaling factor goes to infinity as the
distance, $d$, between any point $y$ and $x$ goes to 0. For scaling white
holes, the scaling factor goes to 0 as $d$ goes to 0. For black scaling holes,
path lengths from a reference point, $z$, to $y$ become infinite as $y$
approaches $x.$ For white holes, path lengths approach a value much less than
the unscaled distance from $z$ to $x.$


title:
Instability of high dimensional Hamiltonian Systems: Multiple resonances
  do not impede diffusion

abstract:
  We consider models given by Hamiltonians of the form
$$H(I,\phi,p,q,t;\epsilon) = h(I) + \sum_{j = 1}^n \pm(\frac{1}{2} p_j^2 +
V_j(q_j)) + \epsilon Q(I,\phi,p,q,t;\epsilon)$$ where $I,\phi$ are
d-dimensional actions and angles, $p,q$ are n-dimensional real conjugated
variables, and $t$ is an angle. These are higher dimensional analogues, both in
the center and hyperbolic directions, of the models studied in previous papers
by the athors. All these models present the large gap problem.
  We show that, for $\epsilon$ small enough, under regularity and explicit
non-degeneracy conditions on the model, there are orbits whose action variables
$I$ perform rather arbitrary excursions in a domain of size O(1). This domain
includes resonance lines and, hence, large gaps among $d$-dimensional KAM tori.
  The method of proof follows closely the strategy of [DLS(=Delshams, Llave and
Seara) 2006]. The main new phenomenon that appears when the dimension $d$ of
the center directions is larger than one, is the existence of multiple
resonances. We show that, since these multiple resonances happen in sets of
codimension greater than one in the space of actions $I$, they can be
contoured. This corresponds to the mechanism called diffusion across resonances
in the Physics literature.
  The present paper, however, differs substantially from [DLS 2006]. On the
technical details of the proofs, we have taken advantage of the theory of the
scattering map [DLS 2008], not available when the above papers were written. We
have analyzed the conditions imposed on the resonances in more detail.
  More precisely, we have found that there is a simple condition on the
Melnikov potential which allows us to conclude that the resonances are crossed.
In particular, this condition does not depend on the resonances. So that the
results are new even when applied to the models in [DLS 2006].


title:
K-Adaptive Partitioning for Survival Data, with an Application to Cancer
  Staging

abstract:
  In medical research, it is often needed to obtain subgroups with
heterogeneous survivals, which have been predicted from a prognostic factor.
For this purpose, a binary split has often been used once or recursively;
however, binary partitioning may not provide an optimal set of well separated
subgroups. We propose a multi-way partitioning algorithm, which divides the
data into K heterogeneous subgroups based on the information from a prognostic
factor. The resulting subgroups show significant differences in survival. Such
a multi-way partition is found by maximizing the minimum of the subgroup
pairwise test statistics. An optimal number of subgroups is determined by a
permutation test. Our developed algorithm is compared with two binary recursive
partitioning algorithms. In addition, its usefulness is demonstrated with a
real data of colorectal cancer cases from the Surveillance Epidemiology and End
Results program. We have implemented our algorithm into an R package maps,
which is freely available in the Comprehensive R Archive Network (CRAN).


title:
Axially symmetric static scalar solitons and black holes with scalar
  hair

abstract:
  We construct static, asymptotically flat black hole solutions with scalar
hair. They evade the no-hair theorems by having a scalar potential which is not
strictly positive. By including an azimuthal winding number in the scalar field
ansatz, we find hairy black hole solutions which are static but axially
symmetric only. These solutions possess a globally regular limit, describing
scalar solitons. A branch of axially symmetric black holes is found to possess
a positive specific heat.


title: Cavity cooling of free silicon nanoparticles in high-vacuum

abstract:
  Laser cooling has given a boost to atomic physics throughout the last thirty
years since it allows one to prepare atoms in motional states which can only be
described by quantum mechanics. Most methods, such as Doppler cooling,
polarization gradient cooling or sub-recoil laser cooling rely, however, on a
near-resonant and cyclic coupling between laser light and well-defined internal
states. Although this feat has recently even been achieved for diatomic
molecules, it is very hard for mesoscopic particles. It has been proposed that
an external cavity may compensate for the lack of internal cycling transitions
in dielectric objects and it may thus provide assistance in the cooling of
their centre of mass state. Here, we demonstrate cavity cooling of the
transverse kinetic energy of silicon nanoparticles propagating in genuine
high-vacuum (< 10^8 mbar). We create and launch them with longitudinal
velocities even down to v < 1 m/s using laser induced thermomechanical stress
on a pristine silicon wafer. The interaction with the light of a high-finesse
infrared cavity reduces their transverse kinetic energy by more than a factor
of 30. This is an important step towards new tests of recent proposals to
explore the still speculative non-linearities of quantum mechanics with objects
in the mass range between 10^7 and 10^10 amu.


title: Enhancement of critical temperatures in disordered bipartite lattices

abstract:
  We study the strong enhancement, induced by random hopping, of the critical
temperatures characterizing the transitions to superconductivity,
charge-density wave and antiferromagnetism, which can occur in bipartite
lattice models at half-filling, like graphene, by means of an extended
Finkel'stein non-linear $\sigma$-model renormalization group approach. We show
that, if Cooper channel interaction dominates, superconducting critical
temperature can be enhanced at will, since superconductivity cannot be broken
by entering any Anderson insulating phase. If, instead, staggered interactions
are relevant, antiferromagnetic order is generated by disorder at a temperature
well above that expected for a clean system.


title: On the time spent in the red by a refracted L\'evy risk process

abstract:
  In this paper, we introduce an insurance ruin model with adaptive premium
rate, thereafter refered to as restructuring/refraction, in which classical
ruin and bankruptcy are distinguished. In this model, the premium rate is
increased as soon as the wealth process falls into the red zone and is brought
back to its regular level when the process recovers. The analysis is mainly
focused on the time a refracted L\'evy risk process spends in the red zone
(analogous to the duration of the negative surplus). Building on results from
Kyprianou and Loeffen (2010) and Loeffen et al. (2012), we identify the
distribution of various functionals related to occupation times of refracted
spectrally negative L\'evy processes. For example, these results are used to
compute the probability of bankruptcy and the probability of Parisian ruin in
this model with restructuring.


title: A critical value for dark energy

abstract:
  Experimental evidence over a number of recent years has shown the density
parameter of the universe omega converging to the critical value of 1, which
defines a flat, Euclidean universe. No such calculations have defined a
critical value for the most significant component of omega, that for the dark
energy, omega lambda, but the new data provided by the Planck probe open up the
previously unconsidered possibility that a particular value with special
physical significance occurs at omega lambda = 2/3. If future observations
should converge on exactly this value, then we may have the first indication
that the explanation for this phenomenon lies in necessary constraints provided
by fundamental laws of physics on possible cosmologies for the universe.


title: English Character Recognition using Artificial Neural Network

abstract:
  This work focuses on development of a Offline Hand Written English Character
Recognition algorithm based on Artificial Neural Network (ANN). The ANN
implemented in this work has single output neuron which shows whether the
tested character belongs to a particular cluster or not. The implementation is
carried out completely in 'C' language. Ten sets of English alphabets
(small-26, capital-26) were used to train the ANN and 5 sets of English
alphabets were used to test the network. The characters were collected from
different persons over duration of about 25 days. The algorithm was tested with
5 capital letters and 5 small letter sets. However, the result showed that the
algorithm recognized English alphabet patterns with maximum accuracy of 92.59%
and False Rejection Rate (FRR) of 0%.


title: Solution to Quadratic Equation Using Genetic Algorithm

abstract:
  Solving Quadratic equation is one of the intrinsic interests as it is the
simplest nonlinear equations. A novel approach for solving Quadratic Equation
based on Genetic Algorithms (GAs) is presented. Genetic Algorithms (GAs) are a
technique to solve problems which need optimization. Generation of trial
solutions have been formed by this method. Many examples have been worked out,
and in most cases we find out the exact solution. We have discussed the effect
of different parameters on the performance of the developed algorithm. The
results are concluded after rigorous testing on different equations.


title: The Academic Social Network

abstract:
  Through academic publications, the authors of these publications form a
social network. Instead of sharing casual thoughts and photos (as in Facebook),
authors pick co-authors and reference papers written by other authors. Thanks
to various efforts (such as Microsoft Libra and DBLP), the data necessary for
analyzing the academic social network is becoming more available on the
Internet. What type of information and queries would be useful for users to
find out, beyond the search queries already available from services such as
Google Scholar? In this paper, we explore this question by defining a variety
of ranking metrics on different entities -authors, publication venues and
institutions. We go beyond traditional metrics such as paper counts, citations
and h-index. Specifically, we define metrics such as influence, connections and
exposure for authors. An author gains influence by receiving more citations,
but also citations from influential authors. An author increases his/her
connections by co-authoring with other authors, and specially from other
authors with high connections. An author receives exposure by publishing in
selective venues where publications received high citations in the past, and
the selectivity of these venues also depends on the influence of the authors
who publish there. We discuss the computation aspects of these metrics, and
similarity between different metrics. With additional information of
author-institution relationships, we are able to study institution rankings
based on the corresponding authors' rankings for each type of metric as well as
different domains. We are prepared to demonstrate these ideas with a web site
(http://pubstat.org) built from millions of publications and authors.


title: Automated Certification of Authorisation Policy Resistance

abstract:
  Attribute-based Access Control (ABAC) extends traditional Access Control by
considering an access request as a set of pairs attribute name-value, making it
particularly useful in the context of open and distributed systems, where
security relevant information can be collected from different sources. However,
ABAC enables attribute hiding attacks, allowing an attacker to gain some access
by withholding information. In this paper, we first introduce the notion of
policy resistance to attribute hiding attacks. We then propose the tool ATRAP
(Automatic Term Rewriting for Authorisation Policies), based on the recent
formal ABAC language PTaCL, which first automatically searches for resistance
counter-examples using Maude, and then automatically searches for an Isabelle
proof of resistance. We illustrate our approach with two simple examples of
policies and propose an evaluation of ATRAP performances.


title:
A conservative spectral method for the Boltzmann equation with
  anisotropic scattering and the grazing collisions limit

abstract:
  We present the formulation of a conservative spectral scheme for Boltzmann
collision operators with anisotropic scattering mechanisms to model grazing
collision limit regimes approximating the solution to the Landau equation in
space homogeneous setting. The scheme is based on the conservative spectral
method of Gamba and Tharkabhushanam [17, 18]. This formulation is derived from
the weak form of the Boltzmann equation, which can represent the collisional
term as a weighted convolution in Fourier space. Within this framework, we also
study the rate of convergence of the Fourier transform for the Boltzmann
collision operator in the grazing collisions limit to the Fourier transform for
the Landau collision operator for a family of non-integrable angular scattering
cross sections. We analytically show that the decay rate to equilibrium depends
on the parameters associated with the collision cross section, and specifically
study numerically the differences between the classical Rutherford scattering
angular cross section, which has logarithmic error in approximating Landau, and
an artificial cross section with a linear error.


title:
Activity clocks: spreading dynamics on temporal networks of human
  contact

abstract:
  Dynamical processes on time-varying complex networks are key to understanding
and modeling a broad variety of processes in socio-technical systems. Here we
focus on empirical temporal networks of human proximity and we aim at
understanding the factors that, in simulation, shape the arrival time
distribution of simple spreading processes. Abandoning the notion of wall-clock
time in favour of node-specific clocks based on activity exposes robust
statistical patterns in the arrival times across different social contexts.
Using randomization strategies and generative models constrained by data, we
show that these patterns can be understood in terms of heterogeneous
inter-event time distributions coupled with heterogeneous numbers of events per
edge. We also show, both empirically and by using a synthetic dataset, that
significant deviations from the above behavior can be caused by the presence of
edge classes with strong activity correlations.


title: Parallel Algorithm for Longest Common Subsequence in a String

abstract:
  In the area of Pattern Recognition and Matching, finding a Longest Common
Subsequence plays an important role. In this paper, we have proposed one
algorithm based on parallel computation. We have used OpenMP API package as
middleware to send the data to different processors. We have tested our
algorithm in a system having four processors and 2 GB physical memory. The best
result showed that the parallel algorithm increases the performance (speed of
computation) by 3.22.


title: Counting genus one partitions and permutations

abstract:
  We prove the conjecture by M. Yip stating that counting genus one partitions
by the number of their elements and parts yields, up to a shift of indices, the
same array of numbers as counting genus one rooted hypermonopoles. Our proof
involves representing each genus one permutation by a four-colored noncrossing
partition. This representation may be selected in a unique way for permutations
containing no trivial cycles. The conclusion follows from a general generating
function formula that holds for any class of permutations that is closed under
the removal and reinsertion of trivial cycles. Our method also provides a new
way to count rooted hypermonopoles of genus one, and puts the spotlight on a
class of genus one permutations that is invariant under an obvious extension of
the Kreweras duality map to genus one permutations.


title: Non-Correlated Character Recognition using Artificial Neural Network

abstract:
  This paper investigates a method of Handwritten English Character Recognition
using Artificial Neural Network (ANN). This work has been done in offline
Environment for non correlated characters, which do not possess any linear
relationships among them. We test that whether the particular tested character
belongs to a cluster or not. The implementation is carried out in Matlab
environment and successfully tested. Fifty-two sets of English alphabets are
used to train the ANN and test the network. The algorithms are tested with 26
capital letters and 26 small letters. The testing result showed that the
proposed ANN based algorithm showed a maximum recognition rate of 85%.