title: Hydrodynamic electron transport and nonlinear waves in graphene

abstract:
  We derive the system of hydrodynamic equations governing the collective
motion of massless fermions in graphene. The obtained equations demonstrate the
lack of Galilean- and Lorentz invariance, and contain a variety of nonlinear
terms due to quasi-relativistic nature of carriers. Using those equations, we
show the possibility of soliton formation in electron plasma of gated graphene.
The quasi-relativistic effects set an upper limit for soliton amplitude, which
marks graphene out of conventional semiconductors. The lack of Galilean and
Lorentz invariance of hydrodynamic equations is revealed in spectra of plasma
waves in the presence of steady flow, which no longer obey the relations of
Doppler shift. The possibility of plasma wave excitation by direct current in
graphene channels is also discussed.


title:
Atomic structure of grain boundaries in iron modeled using the atomic
  density function

abstract:
  A model based on the continuous atomic density function (ADF) approach is
applied to predict the atomic structure of grain boundaries (GBs) in iron.
Symmetrical [100] and [110] tilt GBs in bcc iron are modeled with the ADF
method and relaxed afterwards in molecular dynamics (MD) simulations. The shape
of the GB energy curve obtained in the ADF model reproduces well the
peculiarities of the angles of 70.53 deg. [$\Sigma$ 3(112)] and 129.52 deg.
[$\Sigma$ 11(332)] for [110] tilt GBs. The results of MD relaxation with an
embedded-atom method potential for iron confirm that the atomic GB
configurations obtained in ADF modeling are very close to equilibrium ones. The
developed model provides well-localized atomic positions for GBs of various
geometries.


title:
The magnetic characteristics of Galactic OB stars from the MiMeS survey
  of magnetism in massive stars

abstract:
  The Magnetism in Massive Stars (MiMeS) project represents the largest
systematic survey of stellar magnetism ever undertaken. Based on a sample of
over 550 Galactic B and O-type stars, the MiMeS project has derived the basic
characteristics of magnetism in hot, massive stars. Herein we report
preliminary results.


title:
Investigation of nonlinear effects in Josephson parametric oscillators
  used in circuit QED

abstract:
  We experimentally study the behavior of a parametrically pumped nonlinear
oscillator, which is based on a superconducting \lambda /4 resonator, and is
terminated by a flux-tunable SQUID. We extract parameters for two devices. In
particular, we study the effect of the nonlinearities in the system and compare
to theory. The Duffing nonlinearity, \alpha, is determined from the probe-power
dependent frequency shift of the oscillator, and the nonlinearity, \beta,
related to the parametric flux pumping, is determined from the pump amplitude
for the onset of parametric oscillations. Both nonlinearities depend on the
parameters of the device and can be tuned in-situ by the applied dc flux. We
also suggest how to cancel the effect of \beta by adding a small dc flux and a
pump tone at twice the pump frequency.


title:
Probing isospin- and momentum-dependent nuclear effective interactions
  in neutron-rich matter

abstract:
  The single-particle potentials for nucleons and hyperons in neutron-rich
matter generally depends on the density and isospin asymmetry of the medium as
well as the momentum and isospin of the particle. It further depends on the
temperature of the matter if the latter is in thermal equilibrium. We review
here the extension of a Gogny-type isospin- and momentum-dependent interaction
in several aspects made in recent years and their applications in studying
intermediate-energy heavy ion collisions, thermal properties of asymmetric
nuclear matter and properties of neutron stars. The importance of the isospin-
and momentum-dependence of the single-particle potential, especially the
momentum dependence of the isovector potential, is clearly revealed throughout
these studies.


title: Conformational Transition of H-shaped Branched Polymers

abstract:
  We report dynamic Monte Carlo simulation on conformational transition of
H-shaped branched polymers by varying main chain (backbone) and side chain
(branch) length. H-shaped polymers in comparison with equivalent linear
polymers exhibit a depression of theta temperature accompanying with smaller
chain dimensions. We observed that the effect of branches on backbone dimension
is more pronounced than the reverse, and is attributed to the conformational
heterogeneity prevails within the molecule. With increase in branch length,
backbone is slightly stretched out in coil and globule state. However, in the
pre-collapsed (cf. crumpled globule) state, backbone size decreases with the
increase of branch length. We attribute this non-monotonic behavior as the
interplay between excluded volume interaction and intra-chain bead-bead
attractive interaction during collapse transition. Structural analysis reveals
that the inherent conformational heterogeneity promotes the formation of a
collapsed structure with segregated backbone and branch units (resembles to
'sandwich' or 'Janus' morphology) rather an evenly distributed structure
comprising of all the units. The shape of the collapsed globule becomes more
spherical with increasing either backbone or branch length.


title: The End of the Black Hole Dark Ages, and Warm Absorbers

abstract:
  We consider how the radiation pressure of an accreting supermassive hole
(SMBH) affects the interstellar medium around it. Much of the gas originally
surrounding the hole is swept into a shell with a characteristic radius
somewhat larger than the black hole's radius of influence ($\sim$ 1-100 pc).
The shell has a mass directly comparable to the ($M - \sigma$) mass the hole
will eventually reach, and may have a complex topology. We suggest that
outflows from the central supermassive black holes are halted by collisions
with the shell, and that this is the origin of the warm absorber components
frequently seen in AGN spectra. The shell may absorb and reradiate some of the
black hole accretion luminosity at long wavelengths, implying both that the
bolometric luminosities of some known AGN may have been underestimated, and
that some accreting SMBH may have escaped detection entirely.


title: Green Communication via Power-optimized HARQ Protocols

abstract:
  Recently, efficient use of energy has become an essential research topic for
green communication. This paper studies the effect of optimal power controllers
on the performance of delay-sensitive communication setups utilizing hybrid
automatic repeat request (HARQ). The results are obtained for repetition time
diversity (RTD) and incremental redundancy (INR) HARQ protocols. In all cases,
the optimal power allocation, minimizing the outage-limited average
transmission power, is obtained under both continuous and bursting
communication models. Also, we investigate the system throughput in different
conditions. The results indicate that the power efficiency is increased
substantially, if adaptive power allocation is utilized. For instance, assume
Rayleigh-fading channel, a maximum of two (re)transmission rounds with rates
$\{1,\frac{1}{2}\}$ nats-per-channel-use and an outage probability constraint
${10}^{-3}$. Then, compared to uniform power allocation, optimal power
allocation in RTD reduces the average power by 9 and 11 dB in the bursting and
continuous communication models, respectively. In INR, these values are
obtained to be 8 and 9 dB, respectively.


title: A Monadic Framework for Interactive Realizability

abstract:
  We give a new presentation of interactive realizability with a more explicit
syntax.
  Interactive realizability is a realizability semantics that extends the
Curry-Howard correspondence to (sub-)classical logic, more precisely to
first-order intuitionistic arithmetic (Heyting Arithmetic) extended by the law
of the excluded middle restricted to simply existential formulas, a system
motivated by its applications in proof mining.
  Monads can be used to structure functional programs by providing a clean and
modular way to include impure features in purely functional languages. We
express interactive realizers by means of an abstract framework that applies
the monadic approach used in functional programming to modified realizability,
in order to obtain more "relaxed" realizability notions that are suitable to
classical logic. In particular we use a combination of the state and exception
monads in order to capture the learning-from-mistakes nature of interactive
realizers at the syntactic level.


title: Full NLO massive gauge boson pair production at the LHC

abstract:
  Electroweak gauge boson pair production is a very important process at the
LHC as it probes the non-abelian structure of electroweak interactions and is a
background process for many searches. We present full next-to-leading order
predictions for the production cross sections and distributions of on-shell
massive gauge boson pair production in the Standard Model, including both QCD
and electroweak corrections. The hierarchy between the ZZ, WW and WZ channels,
observed in the transverse momentum distributions, will be analyzed. We will
also present a comparison with experimental data for the total cross sections
including a study of the theoretical uncertainties.


title: Adaptive experiment design for LTI systems

abstract:
  Optimal experiment design for parameter estimation is a research topic that
has been in the interest of various studies. A key problem in optimal input
design is that the optimal input depends on some unknown system parameters that
are to be identified. Adaptive design is one of the fundamental routes to
handle this problem. Although there exist a rich collection of results on
adaptive experiment design, there are few results that address these issues for
dynamic systems. This paper proposes an adaptive input design method for
general single-input single-output linear-time-invariant systems.


title:
The Milky Way Spiral Structure Parameters from Data on Masers and
  Selected Open Clusters

abstract:
  To estimate the parameters of the Galactic spiral structure - namely, the
pitch angle i and the number of spiral arms,- data on Galactic masers with
known trigonometric parallaxes were used. We applied the well-known method
based on analysis of the "position angle - distance logarithm" diagram.
Estimates of the pitch angle i obtained from four segments of different arms
belonging to the global Galactic structure are self-consistent and close to
i=-13+/-1 degrees. The segment which is most interesting is that of the Outer
arm. It contains only three masers. Hence, in order to obtain correct
estimates, we also used the data on 12 very young star clusters with distances
determined by Camargo et al. from infrared photometry. The estimates obtained
allow us to conclude in favor of the four-armed model of the Galactic spiral
structure.


title: HARQ Feedback in Spectrum Sharing Networks

abstract:
  This letter studies the throughput and the outage probability of spectrum
sharing networks utilizing hybrid automatic repeat request (HARQ) feedback. We
focus on the repetition time diversity and the incremental redundancy HARQ
protocols where the results are obtained for both continuous and bursting
communication models. The channel data transmission efficiency is investigated
in the presence of both secondary user peak transmission power and primary user
received interference power constraints. Finally, we evaluate the effect of
secondary-primary channel state information imperfection on the performance of
the secondary channel. Simulation results show that, while the throughput is
not necessarily increased by HARQ, substantial outage probability reduction is
achieved in all conditions.


title: Extinction window of mean field branching annihilating random walk

abstract:
  We study a model of growing population that competes for resources. At each
time step, all existing particles reproduce and the offspring randomly move to
neighboring sites. Then at any site with more than one offspring, the particles
are annihilated. This is a nonmonotone model, which makes the analysis more
difficult. We consider the extinction window of this model in the finite
mean-field case, where there are $n$ sites but movement is allowed to any site
(the complete graph). We show that although the system survives for exponential
time, the extinction window is logarithmic.


title:
Exponential convergence to equilibrium in a coupled gradient flow system
  modelling chemotaxis

abstract:
  We study a system of two coupled nonlinear parabolic equations. It
constitutes a variant of the Keller-Segel model for chemotaxis, i.e. it models
the behaviour of a population of bacteria that interact by means of a
signalling substance. We assume an external confinement for the bacteria and a
nonlinear dependency of the chemotactic drift on the signalling substance
concentration. We perform an analysis of existence and long-time behaviour of
solutions based on the underlying gradient flow structure of the system. The
result is that, for a wide class of initial conditions, weak solutions exist
globally in time and converge exponentially fast to the unique stationary state
under suitable assumptions on the convexity of the confinement and the strength
of the coupling.


title:
Atomistic Simulations of Magnetic Amorphous Solids: Magnetostriction,
  Barkhausen noise and novel singularities

abstract:
  We present results of atomistic simulations of a new model of a magnetic
amorphous solid subjected to external mechanical strains and magnetic fields.
The model employed offers new perspectives on important effects like Barkhausen
noise and magnetostriction. It is shown that the plastic response in such
systems exhibit singularities characterized by unexpected exponents requiring
careful theoretical reasoning. The spatial structure of the plastic events
requires a new coarse grained elasto-magnetic theory which is provided here.


title: Plasticity-Induced Magnetization in Amorphous Magnetic Solids

abstract:
  Amorphous magnetic solids, like metallic glasses, exhibit a novel effect: the
growth of magnetic order as a function of mechanical strain under athermal
conditions in the presence of a magnetic field. The magnetic moment increases
in steps whenever there is a plastic event. Thus plasticity induces the
magnetic ordering, acting as the effective noise driving the system towards
equilibrium. We present results of atomistic simulations of this effect in a
model of a magnetic amorphous solid subjected to pure shear and a magnetic
field. To elucidate the dependence on external strain and magnetic field we
offer a mean-field theory that provides an adequate qualitative understanding
of the observed phenomenon.


title: Decay towards the overall-healthy state in SIS epidemics on networks

abstract:
  The decay rate of SIS epidemics on the complete graph $K_{N}$ is computed
analytically, based on a new, algebraic method to compute the second largest
eigenvalue of a stochastic three-diagonal matrix up to arbitrary precision. The
latter problem has been addressed around 1950, mainly via the theory of
orthogonal polynomials and probability theory. The accurate determination of
the second largest eigenvalue, also called the \emph{decay parameter}, has been
an outstanding problem appearing in general birth-death processes and random
walks. Application of our general framework to SIS epidemics shows that the
maximum average lifetime of an SIS epidemics in any network with $N$ nodes is
not larger (but tight for $K_{N}$) than \[ E\left[ T\right]
\sim\frac{1}{\delta}\frac{\frac{\tau}{\tau_{c}}\sqrt{2\pi}% }{\left(
\frac{\tau}{\tau_{c}}-1\right) ^{2}}\frac{\exp\left( N\left\{
\log\frac{\tau}{\tau_{c}}+\frac{\tau_{c}}{\tau}-1\right\} \right) }{\sqrt
{N}}=O\left( e^{N\ln\frac{\tau}{\tau_{c}}}\right) \] for large $N$ and for an
effective infection rate $\tau=\frac{\beta}{\delta}$ above the epidemic
threshold $\tau_{c}$. Our order estimate of $E\left[ T\right] $ sharpens the
order estimate $E\left[ T\right] =O\left( e^{bN^{a}}\right) $ of Draief and
Massouli\'{e} \cite{Draief_Massoulie}. Combining the lower bound results of
Mountford \emph{et al.} \cite{Mountford2013} and our upper bound, we conclude
that for almost all graphs, the average time to absorption for $\tau>\tau_{c}$
is $E\left[ T\right] =O\left( e^{c_{G}N}\right) $, where $c_{G}>0$ depends on
the topological structure of the graph $G$ and $\tau$.

categories: math.PR cond-mat.stat-mech cs.SI physics.soc-ph


title: On the Betti numbers of some classes of Binomial edge ideals

abstract:
  We study the Betti numbers of binomial edge ideal associated to some classes
of graphs with large Castelnuovo-Mumford regularity. As an application we give
several lower bounds of the Castelnuovo-Mumford regularity of arbitrary graphs
depending on induced subgraphs.


title: Initial ideals of Borel type

abstract:
  In this paper we use some results related to regularity, Betti numbers and
reduction of generic initial ideals, showing their stability in passing from an
ideal to its initial ideal if the last has some simple properties.


title: Collective effects in vortex movements in complex (dusty) plasmas

abstract:
  We study the onset and characteristics of vortices in complex (dusty) plasmas
using two-dimensional simulations in a setup modeled after the PK-3 Plus
laboratory. A small number of microparticles initially self-arranges in a
monolayer around the void. As additional particles are introduced, an extended
system of vortices develops due to a non-zero curl of the plasma forces. We
demonstrate a shear-thinning effect in the vortices. Velocity structure
functions and the energy and enstrophy spectra show that vortex flow turbulence
is present that is in essence of the "classical" Kolmogorov type.


title:
Measuring correlations between non-stationary series with DCCA
  coefficient

abstract:
  In this short report, we investigate the ability of the DCCA coefficient to
measure correlation level between non-stationary series. Based on a wide Monte
Carlo simulation study, we show that the DCCA coefficient can estimate the
correlation coefficient accurately regardless the strength of non-stationarity
(measured by the fractional differencing parameter $d$). For a comparison, we
also report the results for the standard Pearson's correlation coefficient. The
DCCA coefficient dominates the Pearson's coefficient for non-stationary series.


title: Twist versus Nonlinear Stacking in Short DNA Molecules

abstract:
  The denaturation of the double helix is a template for fundamental biological
functions such as replication and transcription involving the formation of
local fluctuational openings. The denaturation transition is studied for
heterogeneous short sequences of DNA, i.e. $\sim 100$ base pairs, in the
framework of a mesoscopic Hamiltonian model which accounts for the helicoidal
geometry of the molecule. The theoretical background for the application of the
path integral formalism to predictive analysis of the molecule thermodynamical
properties is discussed. The base pair displacements with respect to the ground
state are treated as paths whose temperature dependent amplitudes are governed
by the thermal wavelength. The ensemble of base pairs paths is selected, at any
temperature, consistently with both the model potential and the second law of
thermodynamics. The partition function incorporates the effects of the base
pair thermal fluctuations which become stronger close to the denaturation. The
transition appears as a gradual phenomenon starting from the molecule segments
rich in adenine-thymine base pairs. Computing the equilibrium thermodynamics,
we focus on the interplay between twisting of the complementary strands around
the molecule axis and nonlinear stacking potential: it is shown that the latter
affects the melting profiles only if the rotational degrees of freedom are
included in the Hamiltonian. The use of ladder Hamiltonian models for the DNA
complementary strands in the pre-melting regime is questioned.

categories: q-bio.BM cond-mat.soft cond-mat.stat-mech physics.bio-ph


title: A new tool to study real dynamics: The Convergence Plane

abstract:
  In this paper, the author presents a new tool, called The Convergence Plane,
that allows to study the real dynamics of iterative methods whose iterations
depends on one parameter in an easy and compact way. This tool can be used,
inter alia, to find the elements of a family that have good convergence
properties and discard the bad ones or to see how the basins of attraction
changes along the elements of the family. To show the applicability of the tool
an example of the dynamics of the Damped Newton's method applied to a cubic
polynomial is presented.


title:
Chaos in computing the environmental interface temperature: nonlinear
  dynamic and complexity analysis of solutions

abstract:
  We consider an environmental interface regarding as a complex system, in
which difference equations for calculating the environmental interface
temperature and deeper soil layer temperature are represented by the coupled
maps. First equation has its background in the energy balance equation while
the second one in the prognostic equation for deeper soil layer temperature,
commonly used in land surface parameterization schemes. Nonlinear dynamical
consideration of this coupled system includes: (i) examination of period one
fixed point and (ii) bifurcation analysis. Focusing part of analysis is
calculation of the Lyapunov exponent for a specific range of values of system
parameters and discussion about domain of stability for this coupled system.
Finally, we calculate Kolmogorov complexity of time series generated from the
coupled system.


title: Comparative study of helimagnets MnSi and Cu2OSeO3 at high pressures

abstract:
  The heat capacity of helical magnets Cu2OSeO3 and MnSi has been investigated
at high pressures by the ac-calorimetric technique. Despite the differing
nature of their magnetic moments, Cu2OSeO3 and MnSi demonstrate a surprising
similarity in behavior of their magnetic and thermodynamic properties at the
phase transition. Two characteristic features of the heat capacity at the phase
transitions of both substances (peak and shoulder) behave also in a similar way
at high pressures if analyzed as a function of temperature. This probably
implies that the longitudinal spin fluctuations typical of weak itinerant
magnets like MnSi contribute little to the phase transition. The shoulders of
the heat capacity curves shrink with decreasing temperature suggesting that
they arise from classical fluctuations. In case of MnSi the sharp peak and
shoulder at the heat capacity disappear simultaneously probably signifying the
existence of a tricritical point and confirming the fluctuation nature of the
first order phase transition in MnSi as well as in Cu2OSeO3.


title: DBI inflation with a non-minimally coupled Gauss-Bonnet term

abstract:
  We study the inflation in a model with a Gauss-Bonnet term which is
non-minimally coupled to a DBI field. We study the spectrum of the primordial
perturbations in detail. The non-Gaussianity of this model is considered and
the amplitude of the non-Gaussianity is studied in both the equilateral and
orthogonal configurations. By taking various functions of the DBI field,
inflaton potential and the Gauss-Bonnet coupling term, we test the model with
observational data and find some constraints on the Gauss-Bonnet coupling
parameter.


title: Distributed Algorithm for Dynamic Data-Gathering in Sensor Network

abstract:
  In WSN, each sensor is responsible for sensing environmental conditions and
sending them to the one or more base stations. Battery-operated sensors are
severely constrained by the amount of energy that can be spend for transmitting
these sensed data. However, aggregation of data (including removal of redundant
data) at intermediate sensors and forwarding of aggregate data reduce overall
energy consumptions in WSN. In general, data gathering refers to the process of
periodic collection of sensed data from various sensors to one or more base
stations (BS). Energy efficient data gathering scheduling is essential for
improving the lifetime of WSN. In this paper, we propose a distributed
algorithm to compute data-gathering schedule that aim to improve the lifetime
of WSN by suitably selecting energy-efficient data-flow paths from various
sensors to the base station. For a multihop WSN with $n$ sensors, the proposed
algorithm first computes a schedule in $O(n^2)$ time steps, and then this
schedule is periodically updated based the residual energy and the feedback
received from the BS. The system performs approximately $\log(\mathcal{L})$
schedule updates where $\mathcal{L}$ is the expected lifetime of the system in
number of data-gathering rounds. Moreover, each updation process uses the
existing active schedule (data-flow path) - thus consuming only a small
fraction of a single data gathering round activity. Such an algorithm thus
could precisely incorporate the energy consumptions due to updates and related
activities. Moreover, our algorithm does not assume any global knowledge of the
topology or the positions of various sensors. Through simulation study, we
found that our proposed algorithm achieves significantly higher network
lifetime compared to existing data-flow schedules based on the Minimum Spanning
Tree (MST), the Shortest Path Tree (SPT), the Weighted Rooted Tree (WRT).


title:
Asymptotic Compressibility of Entanglement and Classical Communication
  in Distributed Quantum Computation

abstract:
  We consider implementations of a bipartite unitary on many pairs of unknown
input states by local operation and classical communication assisted by shared
entanglement. We investigate to what extent the entanglement cost and the
classical communication cost can be compressed by allowing nonzero but
vanishing error in the asymptotic limit of infinite pairs. We show that a lower
bound on the minimal entanglement cost, the forward classical communication
cost, and the backward classical communication cost per pair is given by the
Schmidt strength of the unitary. We also prove that an upper bound on these
three kinds of the cost is given by the amount of randomness that is required
to partially decouple a tripartite quantum state associated with the unitary.
In the proof, we construct a protocol in which quantum state merging is used.
For generalized Clifford operators, we show that the lower bound and the upper
bound coincide. We then apply our result to the problem of distributed
compression of tripartite quantum states, and derive a lower and an upper bound
on the optimal quantum communication rate required therein.


title: A sharp refinement of a result of Zverovich--Zverovich

abstract:
  For a finite sequence of positive integers to be the degree sequence of a
finite graph, Zverovich and Zverovich gave a sufficient condition involving
only the length of the sequence, its maximal element and its minimal element.
In this paper we give a sharp refinement of Zverovich--Zverovich's result.


title:
NNLO QCD corrections to jet production at hadron colliders from gluon
  scattering

abstract:
  We present the next-to-next-to-leading order (NNLO) QCD corrections to dijet
production in the purely gluonic channel retaining the full dependence on the
number of colours. The sub-leading colour contribution in this channel first
appears at NNLO and, as expected, increases the NNLO correction by around 10%
and exhibits a pT dependence, rising from 8% at low pT to 15% at high pT . The
present calculation demonstrates the utility of the antenna subtraction method
for computing the full colour NNLO corrections to dijet production at the Large
Hadron Collider.


title:
Thermodynamics of the ferromagnetic phase transition in nearly half
  metallic CoS2 at high pressures

abstract:
  The volume change and heat capacity at the ferromagnetic phase transition in
CoS2 were measured at high pressures using X-rays generated by the Argonne
synchrotron light source and by ac-calorimetry, respectively. The transition
entropy, calculated on the basis of these experimental data, drops along the
transition line due to quantum degradation, as required by Nernst law. The
volume change increases strongly along the transition line, which is explained
by specifics of the compressibility difference of coexisting phases that
results from nearly half metallic nature of the ferromagnetic phase of CoS2.


title:
On the first stability eigenvalue of constant mean curvature surfaces
  into homogeneous 3-manifolds

abstract:
  We find out upper bounds for the first eigenvalue of the stability operator
for compact constant mean curvature surfaces immersed into certain
3-dimensional Riemannian spaces, in particular into homogeneous 3-manifolds. As
an application we derive some consequences for strongly stable surfaces in such
ambient spaces. Moreover, we also get a characterization of Hopf tori in
certain Berger spheres.


title: Volume growth, Comparison theorem and Escape Rate of Diffusion Process

abstract:
  We study the escape rate of diffusion process with two approaches. We first
give an upper rate function for the diffusion process associated with a
symmetric, strongly local regular Dirichlet form. The upper rate function is in
terms of the volume growth of the underlying state space. The method is due to
Hsu and Qin [Ann. Probab., 38(4), 2010] where an upper rate function was given
for Brownian motion on Riemannian manifold. In the second part, we prove a
comparison theorem and give an upper rate function for diffusion process on
Riemannian manifold in terms of the upper rate function for the solution
process of a one dimensional stochastic differential equation.


title: Non-thermal radio emission from O-type stars. V. 9 Sgr

abstract:
  The colliding winds in a massive binary system generate synchrotron emission
due to a fraction of electrons that have been accelerated to relativistic
speeds around the shocks in the colliding-wind region. We studied the radio
light curve of 9 Sgr = HD 164794, a massive O-type binary with a 9.1-yr period.
We investigated whether the radio emission varies consistently with orbital
phase and we determined some parameters of the colliding-wind region. We
reduced a large set of archive data from the Very Large Array (VLA) to
determine the radio light curve of 9 Sgr at 2, 3.6, 6 and 20 cm. We also
constructed a simple model that solves the radiative transfer in the
colliding-wind region and both stellar winds. The 2-cm radio flux shows clear
phase-locked variability with the orbit. The behaviour at other wavelengths is
less clear, mainly due to a lack of observations centred on 9 Sgr around
periastron passage. The high fluxes and nearly flat spectral shape of the radio
emission show that synchrotron radiation dominates the radio light curve at all
orbital phases. The model provides a good fit to the 2-cm observations,
allowing us to estimate that the brightness temperature of the synchrotron
radiation emitted in the colliding-wind region at 2 cm is at least 4 x 10^8 K.
The simple model used here already allows us to derive important information
about the colliding-wind region. We propose that 9 Sgr is a good candidate for
more detailed modelling, as the colliding-wind region remains adiabatic during
the whole orbit thus simplifying the hydrodynamics.


title:
Current induced domain wall dynamics in the presence of spin orbit
  torques

abstract:
  Current induced domain wall (DW) motion in perpendicularly magnetized
nanostripes in the presence of spin orbit torques is studied. We show using
micromagnetic simulations that the direction of the current induced DW motion
and the associated DW velocity depend on the relative values of the field like
torque (FLT) and the Slonczewski like torques (SLT). The results are well
explained by a collective coordinate model which is used to draw a phase
diagram of the DW dynamics as a function of the FLT and the SLT. We show that a
large increase in the DW velocity can be reached by a proper tuning of both
torques.


title: Elastic Properties of KH2PO4 at the ferroelectric phase transition

abstract:
  We report results of ultrasonic studies of a single crystal of KDP in the
temperature range 2-300 K. The longitudinal and transverse sound velocities
along [001] and [100] directions were obtained as functions of temperature. The
analysis of the temperature evolution of pseudomoduli $c_{11}$ and $c_{33}$ in
the ferroelectric phase shows that these quantities can be approximated by the
expression $c_{ii}\sim(T-T_0)^{0.5}$ in the temperature range
0.001K$<T_c-T<$0.2K.


title:
A Secure Method for Signing in Using Quick Response Codes with Mobile
  Authentication

abstract:
  The emerging threats to user privacy over the internet are increasing at an
alarming rate. Signing in from an unreliable terminal into a web account may
result in compromising private details of a user such as username and password,
by means of keylogger software. Such software are capable of recording
keystrokes secretly, via covert channels without the knowledge of the user. In
this paper we propose a secure method for signing in using Quick Response (QR)
codes with mobile authentication. Through this method, the user can securely
sign-in into a web account by authenticating the user session on an unreliable
terminal browser, using a mobile device.


title:
Asteroseismic fundamental properties of solar-type stars observed by the
  NASA Kepler Mission

abstract:
  We use asteroseismic data obtained by the NASA Kepler Mission to estimate the
fundamental properties of more than 500 main-sequence and sub-giant stars. Data
obtained during the first 10 months of Kepler science operations were used for
this work, when these solar-type targets were observed for one month each in a
survey mode. Stellar properties have been estimated using two global
asteroseismic parameters and complementary photometric and spectroscopic data.
Homogeneous sets of effective temperatures were available for the entire
ensemble from complementary photometry; spectroscopic estimates of T_eff and
[Fe/H] were available from a homogeneous analysis of ground-based data on a
subset of 87 stars. [Abbreviated version... see paper for full abstract.]


title:
Experimental structure of gravitational wave detection by bounded cold
  electronic plasma in a long pipe

abstract:
  In the previous paper, we introduced a new method of gravitational waves (GW)
detection. In our proposal, we replaced usual Weber's metallic bar with a cold
electronic plasma. We obtained a nonhomogenous differential equation for
tangential electric field that on it GW is known as nonhomogenous term. In this
paper we estimate, the dimension of pipe, the electron density and some other
associated parameters for obtaining the best detection.


title: The chemical state of complex uranium oxides

abstract:
  We report here the first direct observation of U(V) in uranium binary oxides
and analyze the gradual conversion of the U oxidation state in the mixed
uranium systems. Our finding clarifies previous contradicting results and
provides important input for the geological disposal of spent fuel, recycling
applications and chemistry of uranium species.


title:
Role of resonant inelastic x-ray scattering in high-resolution
  core-level spectroscopy of actinide materials

abstract:
  This paper provides a brief overview of applications of advanced X-ray
spectroscopic techniques that take advantage of the resonant inelastic X-ray
scattering (RIXS) in the hard and tender x-ray range and have recently become
available for studying the electronic structure of actinides. We focus here on
the high-energy-resolution X-ray absorption near edge structure (XANES) and
core-to-core and core-to-valence RIXS spectroscopies at the U L and M edges of
uranium compounds. The spectral features are analyzed using a number of
theoretical methods, such as the density functional theory in the local density
approximation with an added Coulomb interaction (LDA+U) and full multiple
scattering (FEFF) and ab-initio finite difference method near-edge structure
(FDMNES) codes. In connection with presented results, the capabilities and
limitations of the experimental techniques and theoretical methods are
discussed.


title:
On some applications of a symbolic representation of non-centered L\'evy
  processes

abstract:
  By using a symbolic technique known in the literature as the classical umbral
calculus, we characterize two classes of polynomials related to L\'evy
processes: the Kailath-Segall and the time-space harmonic polynomials. We
provide the Kailath-Segall formula in terms of cumulants and we recover simple
closed-forms for several families of polynomials with respect to not centered
L\'evy processes, such as the Hermite polynomials with the Brownian motion, the
Poisson-Charlier polynomials with the Poisson processes, the actuarial
polynomials with the Gamma processes, the first kind Meixner polynomials with
the Pascal processes, the Bernoulli, Euler and Krawtchuk polynomials with
suitable random walks.


title: N=2 de Sitter Supersymmetry Algebra

abstract:
  It was shown that N=1 super-symmetry algebra can be constructed in de Sitter
space, through calculation of charge conjugation in the ambient space notation.
Calculation of N=2 super-symmetry algebra constitutes the main frame of this
paper. N=2 super-symmetry algebra was presented in. In this paper, we obtain an
alternative N=2 super-symmetry algebra.


title: Confidence in the neutrino mass hierarchy

abstract:
  The number of sigma of confidence in a determination of the neutrino mass
hierarchy may be obtained from the statistic Delta chi squared. However, as the
hierarchy is a discrete variable, this number is not given by the usual square
root formula. We review a simple Bayesian formula for the sensitivity to the
hierarchy that can be obtained from the median experiment as a function of
Delta chi squared. We compare this analytical formula to 6 years of simulated
data from JUNO together with a 4% (1%) determination of the effective
atmospheric mass splitting from the disappearance channel at MINOS (NOvA). We
find a Delta chi squared of 11 (20) yielding 2.6 sigma (3.9 sigma). However
when the unknown nonlinear energy response of the detector is included in our
analysis this significance degrades considerably. This degradation can be
eliminated by dividing the single detector into a near and far detector of the
same total target mass. A further advantage of a second detector is that, even
while the reactor neutrino experiment runs, the decay at rest of a single, high
intensity, continuously running pion source close to one of the detectors, such
as that described by the DAEdALUS project, may determine the leptonic
CP-violating phase delta.


title:
First stability eigenvalue characterization of CMC Hopf tori into
  Riemannian Killing submersions

abstract:
  We find out upper bounds for the first eigenvalue of the stability operator
for compact constant mean curvature orientable surfaces immersed in a
Riemannian Killing submersion. As a consequence, the strong stability of such
surfaces is studied. We also characterize constant mean curvature Hopf tori as
the only ones attaining the bound in certain cases.


title: The MOND phenomenology

abstract:
  The Lambda-CDM cosmological model is succesful at reproducing various
independent sets of observations concerning the large-scale Universe. This
model is however currently, and actually in principle, unable to predict the
gravitational field of a galaxy from it observed baryons alone. Indeed the
gravitational field should depend on the relative contribution of the particle
dark matter distribution to the baryonic one, itself depending on the
individual assembly history and environment of the galaxy, including a lot of
complex feedback mechanisms. However, for the last thirty years, Milgrom's
formula, at the heart of the MOND paradigm, has been consistently succesful at
predicting rotation curves from baryons alone, and has been resilient to all
sorts of observational tests on galaxy scales. We show that the few individual
galaxy rotation curves that have been claimed to be highly problematic for the
predictions of Milgrom's formula, such as Holmberg II or NGC 3109, are actually
false alarms. We argue that the fact that it is actually possible to predict
the gravitational field of galaxies from baryons alone presents a challenge to
the current Lambda-CDM model, and may indicate a breakdown of our understanding
of gravitation and dynamics, and/or that the actual lagrangian of the dark
sector is very different and richer than currently assumed. On the other hand,
it is obvious that any alternative must also, in fine, reproduce the successes
of the Lambda-CDM model on large scales, where this model is so well-tested
that it presents by itself a challenge to any such alternative.


title: The Potential of the Human Connectome as a Biomarker of Brain Disease

abstract:
  The human connectome at the level of fiber tracts between brain regions has
been shown to differ in patients with brain disorders compared to healthy
control groups. Nonetheless, there is a potentially large number of different
network organizations for individual patients that could lead to cognitive
deficits prohibiting correct diagnosis. Therefore changes that can distinguish
groups might not be sufficient to diagnose the disease that an individual
patient suffers from and to indicate the best treatment option for that
patient. We describe the challenges introduced by the large variability of
connectomes within healthy subjects and patients and outline three common
strategies to use connectomes as biomarkers of brain diseases. Finally, we
propose a fourth option in using models of simulated brain activity (the
dynamic connectome) based on structural connectivity rather than the structure
(connectome) itself as a biomarker of disease. Dynamic connectomes, in addition
to currently used structural, functional, or effective connectivity, could be
an important future biomarker for clinical applications.


title:
Smooth and singular multisoliton solutions of a modified Camassa-Holm
  equation with cubic nonlinearity and linear dispersion

abstract:
  We develop a direct method for solving a modified Camassa-Holm equation with
cubic nonlinearity and linear dispersion under the rapidly decreasing vanishing
boundary condition. We obtain a compact parametric representation for the
multisoliton solutions and investigate their properties. We show that the
introduction of a linear dispersive term exhibits various new features in the
structure of solutions. In particular, we find the smooth solitons whose
characteristics are different from those of the Camassa-Holm equation, as well
as the novel types of singular solitons. A remarkable feature of the soliton
solutions is that the underlying structure of the associated tau-functions is
the same as that of a model equation for shallow-water waves introduced by
Ablowitz {\it et al}(1974 {\it Stud. Appl. Math.} {\bf 53} 249-315). Finally,
we demonstrate that the short-wave limit of the soliton solutions recovers the
soliton solutions of the short pulse equation which describes the propagation
of ultra-short optical pulses in nonlinear media.


title: Control of Radiation Damage in MoS2 by Graphene Encapsulation

abstract:
  Recent dramatic progress in studying various two-dimensional (2D) atomic
crystals and their heterostructures calls for better and more detailed
understanding of their crystallography, reconstruction, stacking order, etc.
For this, direct imaging and identification of each and every atom is
essential. Transmission Electron Microscopy (TEM) and Scanning Transmission
Electron Microscopy (STEM) are ideal, and perhaps the only tools for such
studies. However, the electron beam can in some cases induce dramatic structure
changes and radiation damage becomes an obstacle in obtaining the desired
information in imaging and chemical analysis in the (S)TEM. This is the case of
2D materials such as molybdenum disulfide MoS2, but also of many biological
specimens, molecules and proteins. Thus, minimizing damage to the specimen is
essential for optimum microscopic analysis. In this letter we demonstrate, on
the example of MoS2, that encapsulation of such crystals between two layers of
graphene allows for a dramatic improvement in stability of the studied 2D
crystal, and permits careful control over the defect nature and formation in
it. We present STEM data collected from single layer MoS2 samples prepared for
observation in the microscope through three distinct procedures. The fabricated
single layer MoS2 samples were either left bare (pristine), placed atop a
single-layer of graphene or finally encapsulated between single graphene
layers. Their behaviour under the electron beam is carefully compared and we
show that the MoS2 sample 'sandwiched' between the graphene layers has the
highest durability and lowest defect formation rate compared to the other two
samples, for very similar experimental conditions.


title:
\textit{Ab initio} calculation of transport and optical properties of
  aluminum: influence of simulation parameters

abstract:
  This work is devoted to the \textit{ab initio} calculation of transport and
optical properties of aluminum. The calculation is based on the quantum
molecular dynamics simulation, density functional theory and the Kubo-Greenwood
formula. Mainly the calculations are performed for liquid aluminum at
near-normal densities for the temperatures from melting up to 20000 K. The
results on dynamic electrical conductivity, static electrical conductivity and
thermal conductivity are obtained and compared with available reference and
experimental data and the calculations of other authors. The influence of the
technical parameters on the results is investigated in detail. The error of
static electrical conductivity calculation is estimated to be about 20%; more
accurate results require bigger number of atoms.


title: Gray molasses cooling of $^{39}$K to a high phase-space density

abstract:
  We present new techniques in cooling 39K atoms using laser light close to the
D1 transition. First, a new compressed-MOT configuration is taking advantage of
gray molasses type cooling induced by blue-detuned D1 light. It yields an
optimized density of atoms. Then, we use pure D1 gray molasses to further cool
the atoms to an ultra-low temperature of 6\,$\mu$K. The resulting phase-space
density is $2 \times 10^{-4}$ and will ease future experiments with ultracold
potassium. As an example, we use it to directly load up to $3\times 10^7$ atoms
in a far detuned optical trap, a result that opens the way to the all-optical
production of potassium degenerate gases.


title: MBE grown microcavities based on selenium and tellurium compounds

abstract:
  In this work, we present three groups of microcavities: based on selenium
compounds only, based on tellurium compounds only, and structures based on
mixed selenium and tellurium compounds. We focus on their possible applications
in the field of optoelectronic devices and fundamental physics (VCSELs, narrow
range light sources, studies of cavity-polariton electrodynamics) in a range of
wavelength from 540 to 760 nm.


title: The central support of the Plancherel measure of an affine Hecke algebra

abstract:
  We give conceptual proofs of certain basic properties of the arrangement of
shifted root hyperplanes associated to a root system and a Weyl group invariant
real valued parameter function on the root system. The method is based on the
role of this shifted root hyperplane arrangement for the harmonic analysis of
affine Hecke algebras. In addition this yields a conceptual proof of the
description of the central support of the Plancherel measure of an affine Hecke
algebra given in math.RT.0101007v4.


title: Percolation transition by random vertex splitting of diamond networks?

abstract:
  We propose a statistical model defined on the three-dimensional diamond
network where the splitting of randomly selected nodes leads to a spatially
disordered network, with decreasing degree of connectivity. The terminal state,
that is reached when all nodes have been split, is a dense configuration of
self-avoiding walks on the diamond network. Starting from the crystallographic
diamond network, each of the four-coordinated nodes is replaced with
probability p by a pair of two edges, each connecting a pair of the adjacent
vertices. For all values of 0 <= p <= 1 the network percolates, yet the
fraction fp of the system that belongs to a percolating cluster drops sharply
at pc=1 to a finite value. This transition has the signature of a phase
transition with scaling exponents for p close to pc that are different from the
critical exponents of the second-order phase transition of standard percolation
models. As is the case for percolation transitions, this transition
significantly affects the mechanical properties of linear-elastic realisations,
obtained by replacing edges with solid circular struts to give an effective
density phi. Finite element methods demonstrate that, as a low-density cellular
structure, the bulk modulus K shows a cross-over from a compression-dominated
behaviour (with K proportional to phi) at p=0 to a bending-dominated behaviour
(with quadratic dependence of K on phi) at p=1.


title: Point-to-point distance in first passage percolation on (tree) x Z

abstract:
  We consider first passage percolation (FPP) on T_d x Z, where T_d is the
d-regular tree (d>=3). It is shown that for a fixed vertex v in the tree, the
fluctuation of the distance in the FPP metric between the points (v,0) and
(v,n) is of the order of at most log n. We conjecture that the real
fluctuations are of order 1 and explain why.


title: Proceedings 6th Interaction and Concurrency Experience

abstract:
  This volume contains the proceedings of ICE 2013, the 6th Interaction and
Concurrency Experience workshop, which was held in Florence, Italy on the 6th
of June 2013 as a satellite event of DisCoTec 2013. The ICE procedure for paper
selection allows PC members to interact, anonymously, with authors. During the
review phase, each submitted paper is published on a Wiki and associated with a
discussion forum whose access is restricted to the authors and to all the PC
members not declaring a conflict of interests. The PC members post comments and
questions that the authors reply to. Each paper was reviewed by three PC
members, and altogether 6 papers were accepted for publication. We were proud
to host two invited talks, Davide Sangiorgi and Filippo Bonchi, whose abstracts
are included in this volume together with the regular papers. The workshop also
featured a brief announcement of an already published paper.


title: Doppler imaging of the double-lined active binary V824 Ara

abstract:
  We introduce an iterative spectral disentangling technique combined with
Doppler imaging in order to recover surface temperature maps for both
components of double-lined active binary systems. Our method provides an
opportunity to separate spectra of the active components while minimizing the
unwanted disturbances on the given line profile from the other component. The
efficiency of the method is demonstrated on real data of the double-lined RS
CVn-type binary V824 Ara. The resulting Doppler images reveal cool spots on the
polar regions as well as low-latitude features on both of the stars. Moreover,
both components have hot spots, that are facing each other. This may indicate
interconnection between the stellar magnetic fields.


title: Nonparametric Estimation for Jump-Diffusion CIR Model

abstract:
  We study the nonparametric estimation for the intensity of Poisson random
measure in jump-diffusion CIR model based on the low frequency observations.
This is given in terms of the minimization of norms on a nonempty, closed and
convex subset of some special Hilbert space. We establish the measurability of
the estimator and derive its consistency and asymptotic risk bound.


title:
System size dependence of hadron $p_T$ spectra in p+p and Au+Au
  collisions at $\sqrt{s_{NN}}$ = 200 GeV

abstract:
  We make a systematic study of transverse momentum ($p_T$) spectra of hadrons
produced in $p+p$ and in different centralities of Au+Au collisions at
$\sqrt{s}=200$\,GeV using phenomenological fit functions. The Tsallis
distribution gives a very good description of hadron spectra in $p+p$
collisions with just two parameters but does not produce the same in Au+Au
collisions at intermediate $p_{T}$. To explain the hadron spectra in heavy ion
collisions in a wider $p_{T}$ range we propose a modified Tsallis function by
introducing an additional parameter which accounts for collective flow. The new
analytical function gives a very good description of both mesons and baryons
spectra at all centralities of Au+Au collisions in terms of parameters having a
potential physics interpretation. With this modified Tsallis function we study
the spectra of pions, kaons, protons, $\Lambda(1115)$ and $\Xi^{-}$ as a
function of system size at $\sqrt{s_{NN}}$ = 200 GeV. The parameter
representing transverse flow increases with system size and is found to be more
far baryons than that for mesons in central Au+Au collisions. The freeze-out
temperature for baryons increases with centrality in Au+Au collisions more
rapidly than for mesons.


title: Overlapping community detection in signed networks

abstract:
  Complex networks considering both positive and negative links have gained
considerable attention during the past several years. Community detection is
one of the main challenges for complex network analysis. Most of the existing
algorithms for community detection in a signed network aim at providing a
hard-partition of the network where any node should belong to a community or
not. However, they cannot detect overlapping communities where a node is
allowed to belong to multiple communities. The overlapping communities widely
exist in many real world networks. In this paper, we propose a signed
probabilistic mixture (SPM) model for overlapping community detection in signed
networks. Compared with the existing models, the advantages of our methodology
are (i) providing soft-partition solutions for signed networks; (ii) providing
soft-memberships of nodes. Experiments on a number of signed networks show that
our SPM model: (i) can identify assortative structures or disassortative
structures as the same as other state-of-the-art models; (ii) can detect
overlapping communities; (iii) outperform other state-of-the-art models at
shedding light on the community detection in synthetic signed networks.


title:
The interfacial effects on the spin density wave in FeSe/SrTiO3 thin
  film

abstract:
  Recently, the signs of both superconducting transition temperature (Tc)
beyond 60 K and spin density wave (SDW) have been observed in FeSe thin film on
SrTiO3 (STO) substrate, which suggests a strong interplay between
superconductivity and magnetism. With the first-principles calculations, we
find that the substrate-induced tensile strain tends to stabilize the SDW state
in FeSe thin film by enhancing of the next-nearest-neighbor superexchange
antiferromagnetic interaction bridged through Se atoms. On the other hand, we
find that when there are oxygen vacancies in the substrate, the significant
charge transfer from the substrate to the first FeSe layer would suppress the
magnetic order there, and thus the high-temperature superconductivity could
occur. In addition, the stability of the SDW is lowered when FeSe is on a
defect-free STO substrate due to the redistribution of charges among the Fe
3d-orbitals. Our results provide a comprehensive microscopic explanation for
the recent experimental findings, and build a foundation for the further
exploration of the superconductivity and magnetism in this novel
superconducting interface.


title:
On complexified analytic Hamiltonian flows and geodesics on the space of
  Kahler metrics

abstract:
  In the case of a compact real analytic symplectic manifold M we describe an
approach to the complexification of Hamiltonian flows [Se, Do1, Th1] and
corresponding geodesics on the space of Kahler metrics. In this approach,
motivated by recent work on quantization, the complexified Hamiltonian flows
act, through the Grobner theory of Lie series, on the sheaf of complex valued
real analytic functions, changing the sheaves of holomorphic functions. This
defines an action on the space of (equivalent) complex structures on M and also
a direct action on M. This description is related to the approach of [BLU]
where one has an action on a complexification M_C of M followed by projection
to M. Our approach allows for the study of some Hamiltonian functions which are
not real analytic. It also leads naturally to the consideration of continuous
degenerations of diffeomorphisms and of Kahler structures of M. Hence, one can
link continuously (geometric quantization) real, and more general non-Kahler,
polarizations with Kahler polarizations. This corresponds to the extension of
the geodesics to the boundary of the space of Kahler metrics. Three
illustrative examples are considered. We find an explicit formula for the
complex time evolution of the Kahler potential under the flow. For integral
symplectic forms, this formula corresponds to the complexification of the
prequantization of Hamiltonian symplectomorphisms. We verify that certain
families of Kahler structures, which have been studied in geometric
quantization, are geodesic families.


title: Discrete Gauge Symmetry and Aharonov-Bohm Radiation in String Theory

abstract:
  We investigate cosmological constraints on phenomenological models with
discrete gauge symmetries by discussing the radiation of standard model
particles from Aharonov-Bohm strings. Using intersecting D-brane models in Type
IIA string theory, we demonstrate that Aharonov-Bohm radiation, when combined
with cosmological observations, imposes constraints on the compactification
scales.


title: The Interactions of Solitons in the Novikov-Veselov Equation

abstract:
  Using the reality condition of the solutions, one constructs the real
Pfaffian N-solitons solutions of the Novikov-Veselov (NV) equation using the
$\tan$ function and the Schur identity. By the minor-summation formula of the
Pfaffian, we can study the interactions of solitons in the Novikov-Veselov
equation from the Kadomtsev-Petviashvili (KP) equation's point of view, that
is, the totally non-negative Grassmannian. Especially, the Y-shape resonance,
O-type and the P-type interactions of X-shape are investigated. Also, the
maximum amplitude of the intersection of the line solitons and the critical
angle are computed and one makes a comparison with the KP-(II) equation.


title:
Existence, Uniqueness, Analyticity, and Borel Summability for Boussinesq
  Equations

abstract:
  Through Borel summation methods, we analyze the Boussinesq equations for
coupled fluid velocity and temperature fields. We prove that an equivalent
system of integral equations in the Borel variable p dual to 1/t has a unique
solution in a class of exponentially bounded functions, implying the existence
of a classical solution to the Boussinesq equations in a complex t-region that
includes a real positive time axis segment. For analytic initial data and
forcing, it is shown that the solution is Borel summable, implying that that
formal series in powers of t is Gevrey-1 asymptotic, and within the time
interval of existence, the solution remains analytic with the same analyticity
strip width as the initial data and forcing. We also determine conditions on
the integral equation solution that improve the estimate for existence time.


title:
An updated list of AGILE bright gamma-ray sources and their variability
  in pointing mode

abstract:
  We present a variability study of a sample of bright gamma-ray (30 MeV -- 50
GeV) sources. This sample is an extension of the first AGILE catalogue of
gamma-ray sources (1AGL), obtained using the complete set of AGILE observations
in pointing mode performed during a 2.3 year period from July 9, 2007 until
October 30, 2009. The dataset of AGILE pointed observations covers a long time
interval and its gamma-ray data archive is useful for monitoring studies of
medium-to-high brightness gamma-ray sources. In the analysis reported here, we
used data obtained with an improved event filter that covers a wider field of
view, on a much larger (about 27.5 months) dataset, integrating data on
observation block time scales, which mostly range from a few days to thirty
days.
  The data processing resulted in a better characterized source list than 1AGL
was, and includes 54 sources, 7 of which are new high galactic latitude (|BII|
>= 5) sources, 8 are new sources on the galactic plane, and 20 sources from the
previous catalogue with revised positions. Eight 1AGL sources (2 high-latitude
and 6 on the galactic plane) were not detected in the final processing either
because of low OB exposure and/or due to their position in complex galactic
regions. We report the results in a catalogue of all the detections obtained in
each single OB, including the variability results for each of these sources. In
particular, we found that 12 sources out of 42 or 11 out of 53 are variable,
depending on the variability index used, where 42 and 53 are the number of
sources for which these indices could be calculated. Seven of the 11 variable
sources are blazars, the others are Crab pulsar+nebula, LS I +61{\deg}303, Cyg
X-3, and 1AGLR J2021+4030.


title: Localized topological pressure and equilibrium states

abstract:
  We introduce the notion of localized topological pressure for continuous maps
on compact metric spaces. The localized pressure of a continuous potential
$\varphi$ is computed by considering only those $(n,\epsilon)$-separated sets
whose statistical sums with respect to an $m$-dimensional potential $\Phi$ are
"close" to a given value $w\in \bR^m$. We then establish for several classes of
systems and potentials $\varphi$ and $\Phi$ a local version of the variational
principle. We also construct examples showing that the assumptions in the
localized variational principle are fairly sharp. Next, we study localized
equilibrium states and show that even in the case of subshifts of finite type
and H\"older continuous potentials, there are several new phenomena that do not
occur in the theory of classical equilibrium states. In particular, ergodic
localized equilibrium states for H\"older continuous potentials are in general
not unique.


title:
A sharp strong maximum principle and a sharp unique continuation theorem
  for singular minimal hypersurfaces

abstract:
  We prove the two theorems of the title, settling two long standing questions
in the local theory of singular minimal hypersurfaces. The sharpness of either
result is with respect to its hypothesis on the size of the allowable singular
sets. The proofs of both theorems rely heavily on the author's recent
regularity and compactness theory for stable minimal hypersurfaces, and on
earlier work of Ilmanen, Simon and Solomon--White.


title: Diffeomorphisms with stable manifolds as basin boundary

abstract:
  In this paper we study the dynamics of a family of diffeomorphisms in $\bR^2$
defined by $ F(x,y)=(g(x)+h(y),h(x)), $ where $ g(x) $ is a unimodal $C^2$-map
which has the same dynamical properties as the logistic map $P(x)=\mu x(1-x)$,
and $h(x) $ is a $C^2$ map which is a small perturbation of a linear map. For
certain maps of this form we show that there are exactly two periodic points,
namely an attracting fixed point and a saddle fixed point and the boundary of
the basin of attraction is the stable manifold of the saddle.
  The basin boundary also has the same regularity as $F$, in contrast to the
frequently observed fractal nature of basin boundaries. To establish these
results we describe the orbits under forward and backward iteration of every
point in the plane.


title:
Modules for Relative Yangians (Family Algebras) and Kazhdan-Lusztig
  Polynomials

abstract:
  Let g be a complex simple Lie algebra and let V be a finite dimensional U(g)
module. A relative Yangian is defined with respect to this pair.
  According to recent work of Khoroshkin and Nazarov the finite dimensional
simple modules of the Yangians for g = sl(n) or the twisted Yangians for g =
sp(2n); so(n) are described by the simple modules of relative Yangians for some
V using the appropriate simple Lie algebra g. Here a classification of the
simple modules of a relative Yangian is obtained simply and briefly as an
advanced exercise in Frobenius reciprocity inspired by a Bernstein- Gelfand
equivalence of categories. An unexpected fact is that the dimension of these
modules are determined by the Kazhdan-Lusztig polynomials and conversely the
latter are described in terms of dimensions of certain extension groups
associated to finite dimensional modules of relative Yangians.


title:
Photon Number Splitting of Squeezed Light by a Single Qubit in Circuit
  QED

abstract:
  We theoretically propose an efficient way to generate and detect squeezed
light by a single qubit in circuit QED. By tuning the qubit energy splitting
close to the fundamental frequency of the first harmonic mode (FHM) in a
transmission line resonator and placing the qubit at the nodal point of the
third harmonic mode, one can generate the resonantly enhanced squeezing of the
FHM upon pumping with the second harmonic mode. In order to investigate the
photon number splitting for the squeezed FHM, we have numerically calculated
the qubit absorption spectrum, which exhibits regularly spaced peaks at
frequencies separated by twice the effective dispersive shift. It is also shown
that adding a small pump field for the FHM makes additional peaks develop in
between the dominant ones as well.


title: Chains of functions in $C(K)$-spaces

abstract:
  The Bishop property ($\symbishop$), introduced recently by K.P. Hart, T.
Kochanek and the first-named author, was motivated by Pe{\l}czy{\'n}ski's
classical work on weakly compact operators on $C(K)$-spaces. This property
asserts that certain chains of functions in said spaces, with respect to a
particular partial ordering, must be countable. There are two versions of
($\symbishop$): one applies to linear operators on $C(K)$-spaces and the other
to the compact Hausdorff spaces themselves.
  We answer two questions that arose after ($\symbishop$) was first introduced.
We show that if $\mathscr{D}$ is a class of compact spaces that is preserved
when taking closed subspaces and Hausdorff quotients, and which contains no
non-metrizable linearly ordered space, then every member of $\mathscr{D}$ has
($\symbishop$). Examples of such classes include all $K$ for which $C(K)$ is
Lindel\"of in the topology of pointwise convergence (for instance, all Corson
compact spaces) and the class of Gruenhage compact spaces. We also show that
the set of operators on a $C(K)$-space satisfying ($\symbishop$) does not form
a right ideal in $\mathscr{B}(C(K))$. Some results regarding local
connectedness are also presented.


title:
Monge problem in metric measure spaces with Riemannian
  curvature-dimension condition

abstract:
  We prove the existence of solutions for the Monge minimization problem,
addressed in a metric measure space $(X,d,m)$ enjoying the Riemannian
curvature-dimension condition $\RCD(K,N)$, with $N < \infty$. For the first
marginal measure, we assume that $\mu_{0} \ll m$. As a corollary, we obtain
that the Monge problem and its relaxed version, the Monge-Kantorovich problem,
attain the same minimal value.
  Moreover we prove a structure theorem for $d$-cyclically monotone sets:
neglecting a set of zero $m$-measure they do not contain any branching
structures, that is, they can be written as the disjoint union of the image of
a disjoint family of geodesics.


title:
Constraints on kHz QPO models and stellar EOSs from SAX J1808.4-3658,
  Cyg X-2 and 4U 1820-30

abstract:
  We test the relativistic precession model (RPM) and the MHD Alfven wave
oscillation model (AWOM) for the kHz QPOs by the sources with measured NS
masses and twin kHz QPO frequencies. For RPM, the derived NS mass of Cyg X-2
(SAX J1808.4-3658 and 4U 1820-30) is 1.96 +/- 0.10 solar masses (2.83 +/- 0.04
solar masses and 1.85 +/- 0.02 solar masses), which is 30% (100% and 40%)
higher than the measured result 1.5 +/- 0.3 solar masses (< 1.4 solar masses
and 1.29 + 0.19 / - 0.07 solar masses). For AWOM, where the free parameter of
model is the density of star, we infer the NS radii to be around 10 - 20 km for
the above three sources, based on which we can infer the matter compositions
inside NSs with the help of the equations of state (EOSs). In particular, for
SAX J1808.4-3658, AWOM shows a lower mass density of its NS than those of the
other known kHz QPO sources, with the radius range of 17 - 20 km, which
excludes the strange quark matter inside its star.


title:
MOSDEN: An Internet of Things Middleware for Resource Constrained Mobile
  Devices

abstract:
  The Internet of Things (IoT) is part of Future Internet and will comprise
many billions of Internet Connected Objects (ICO) or `things' where things can
sense, communicate, compute and potentially actuate as well as have
intelligence, multi-modal interfaces, physical/ virtual identities and
attributes. Collecting data from these objects is an important task as it
allows software systems to understand the environment better. Many different
hardware devices may involve in the process of collecting and uploading sensor
data to the cloud where complex processing can occur. Further, we cannot expect
all these objects to be connected to the computers due to technical and
economical reasons. Therefore, we should be able to utilize resource
constrained devices to collect data from these ICOs. On the other hand, it is
critical to process the collected sensor data before sending them to the cloud
to make sure the sustainability of the infrastructure due to energy
constraints. This requires to move the sensor data processing tasks towards the
resource constrained computational devices (e.g. mobile phones). In this paper,
we propose Mobile Sensor Data Processing Engine (MOSDEN), an plug-in-based IoT
middleware for mobile devices, that allows to collect and process sensor data
without programming efforts. Our architecture also supports sensing as a
service model. We present the results of the evaluations that demonstrate its
suitability towards real world deployments. Our proposed middleware is built on
Android platform.


title: Constraining extended Higgs sectors with HiggsSignals

abstract:
  We introduce the public computer code HiggsSignals, which can be used to test
the predictions from models with arbitrary Higgs sectors against experimental
measurements. Following a brief description of the code, several examples of
HiggsSignals applications are given. We derive constraints on extended Higgs
sectors taking into account the measured rates for the observed LHC Higgs
signal in all available channels. The results are presented both in a
model-independent framework with coupling scale factors that parametrize
deviations from the Standard Model, and in a model-dependent example where we
analyze a specific benchmark scenario of the minimal supersymmetric standard
model.


title:
A geometric perspective on the piecewise polynomiality of double Hurwitz
  numbers

abstract:
  We describe double Hurwitz numbers as intersection numbers on the moduli
space of curves. Assuming polynomiality of the Double Ramification Cycle (which
is known in genera 0 and 1), our formula explains the polynomiality in chambers
of double Hurwitz numbers, and the wall crossing phenomenon in terms of a
variation of correction terms to the {\psi} classes. We interpret this as
suggestive evidence for polynomiality of the Double Ramification Cycle.


title:
Existence and stability of measure solutions for BSDE with generators of
  quadratic growth

abstract:
  With an emphasis on generators with quadratic growth in the control variable
we consider measure solutions of BSDE, a solution concept corresponding to the
notion of risk neutral measure in mathematical finance. In terms of measure
solutions, solving a BSDE reduces to martingale representation with respect to
an underlying filtration. Measure solutions related to measures equivalent to
the historical one provide classical solutions. We derive the existence of
measure solutions in scenarios in which the generating functions are just
continuous, of at most linear growth in the control variable (corresponding to
generators of at most quadratic growth in the usual sense), and with a random
bound in the time parameter whose stochastic integral is a BMO martingale. Our
main tools include a stability property of sequences of measure solutions, for
which a limiting solution is obtained by means of the weak convergence of
measures.


title: Forcing axioms for $\lambda$-complete $\mu^+$-C.C

abstract:
  We note that some form of the condition "$p_1, p_2$ have a
$\leq_{\mathbb{Q}}$-lub in $\mathbb{Q}$" is necessary in some forcing axiom for
$\lambda$-complete $\mu^+$-c.c. forcing notions. We also show some versions are
really stronger than others.


title:
An analysis of the trade-off between spatial and temporal resources for
  measurement-based quantum computation

abstract:
  In measurement-based quantum computation (MBQC), elementary quantum
operations can be more parallelized than the quantum circuit model by employing
a larger Hilbert space of graph states used as the resource. Thus MBQC can be
regarded as a method of quantum computation where the temporal resource
described by the depth of quantum operations can be reduced compared to the
quantum circuit model by using the extra spatial resource described by graph
states. To analyze the trade-off relationship of the spatial and temporal
resources, we consider a method to obtain quantum circuit decompositions of
general unitary transformations represented by MBQC on graph states with a
certain underlying geometry called generalized flow. We present a method to
translate any MBQC with generalized flow into quantum circuits without extra
spatial resource. We also show an explicit way to unravel acausal gates that
appear in the quantum circuit decomposition derived by a translation method
presented in [V. Danos and E. Kashefi, Phys. Rev. A {\bf 74}, 052310 (2006)]
and that represent an effect of the reduction of the temporal resource in MBQC.
Finally, by considering a way to deterministically simulate these acausal
gates, we investigate a general framework to analyze the trade-off between the
spacial and temporal resources for quantum computation.


title:
Relativistic particle-like structures associated with multi-soliton
  solutions of (1+2)-dimensional Sine-Gordon equation

abstract:
  The Sine-Gordon equation in (1+2) dimensions has N-soliton solutions that
propagate at velocities that are lower than the speed of light (c = 1), for any
N greater tha or equal to 1. A first integral of the equation, which vanishes
identically on the single soliton solution, maps multisoliton solutions onto
structures that are localized around soliton junctions. The profile of such a
structure obeys the (1+2)-dimensional linear wave equation, driven by a source
term, which is constructed from a multisoliton solution of the Sine-Gordon
equation. If the localized solutions of the source-driven wave equation are
interpreted as mass densities, they emulate free, spatially extended, massive
relativistic particles. This physical picture is summarized in terms of a
Lagrangian density for a dynamical system, in which the Sine-Gordon equation
and the linear wave equation are coupled by a small coupling term. The
Euler-Lagrange equations of motion allow for solutions, which, in lowest order
in the coupling constant are the soliton solutions of the Sine-Gordon equation,
and the first-order component are the structures that emulate spatially
extended relativistic particles.


title:
Transverse spin Seebeck vs. Anomalous and Planar Nernst Effects in
  Permalloy Thin Films

abstract:
  Transverse magneto-thermoelectric effects are studied in permalloy thin films
grown on MgO and GaAs substrates and compared to those grown on suspended SiN
membranes. The transverse voltage along platinum strips patterned on top of the
permalloy films is measured vs. the external magnetic field as a function of
angle and temperature gradient. After the identification of the contribution of
the planar and anomalous Nernst effects, we find an upper limit for the
transverse spin Seebeck effect, which is several orders of magnitude smaller
than previously reported.


title: Explicit schemes for parabolic and hyperbolic equations

abstract:
  Standard explicit schemes for parabolic equations are not very convenient for
computing practice due to the fact that they have strong restrictions on a time
step. More promising explicit schemes are associated with explicit-implicit
splitting of the problem operator (Saul'yev asymmetric schemes, explicit
alternating direction (ADE) schemes, group explicit method). These schemes
belong to the class of unconditionally stable schemes, but they demonstrate bad
approximation properties. These explicit schemes are treated as schemes of the
alternating triangle method and can be considered as factorized schemes where
the problem operator is splitted into the sum of two operators that are adjoint
to each other. Here we propose a multilevel modification of the alternating
triangle method, which demonstrates better properties in terms of accuracy. We
also consider explicit schemes of the alternating triangle method for the
numerical solution of boundary value problems for hyperbolic equations of
second order. The study is based on the general theory of stability
(well-posedness) for operator-difference schemes.


title:
New distribution spaces associated to translation-invariant Banach
  spaces

abstract:
  We introduce and study new distribution spaces, the test function space
$\mathcal{D}_E$ and its strong dual $\mathcal{D}'_{E'_{\ast}}$. These spaces
generalize the Schwartz spaces $\mathcal{D}_{L^{q}}$, $\mathcal{D}'_{L^{p}}$,
$\mathcal{B}'$ and their weighted versions. The construction of our new
distribution spaces is based on the analysis of a suitable
translation-invariant Banach space of distributions $E$ with continuous
translation group, which turns out to be a convolution module over a Beurling
algebra $L^{1}_{\omega}$. The Banach space $E'_{\ast}$ stands for
$L_{\check{\omega}}^1\ast E'$. We also study convolution and multiplicative
products on $\mathcal{D}'_{E'_{\ast}}$.


title:
From Stinespring dilation to Sz.-Nagy dilation on the symmetrized bidisc
  and operator models

abstract:
  We provide an explicit normal distinguished boundary dilation to a pair of
commuting operators $(S,P)$ having the closed symmetrized bidisc $\Gamma$ as a
spectral set. This is called Sz.-Nagy dilation of $(S,P)$. The operator pair
that dilates $(S,P)$ is obtained by an application of Stinespring dilation of
$(S,P)$ given by Agler and Young. We further prove that the dilation is minimal
and the dilation space is no bigger than the dilation space of the minimal
unitary dilation of the contraction $P$. We also describe model space and model
operators for such a pair $(S,P)$.


title: The role of low-mass star clusters in forming the massive stars in DR 21

abstract:
  We have studied the young low-mass pre-main sequence (PMS) stellar population
associated with the massive star-forming region DR 21 by using archival X-ray
Chandra observations and by complementing them with existing optical and IR
surveys. The Chandra observations have revealed for the first time a new highly
extincted population of PMS low-mass stars previously missed in observations at
other wavelengths. The X-ray population exhibits three main stellar density
peaks, coincident with the massive star-forming regions, being the DR 21 core
the main peak. The cross-correlated X-ray/IR sample exhibits a radial
"Spokes-like" stellar filamentary structure that extends from the DR 21 core
towards the northeast. The near IR data reveal a centrally peaked structure for
the extinction, which exhibits its maximum in the DR 21 core and gradually
decreases with the distance to the N-S cloud axis and to the cluster center. We
find evidence of a global mass segregation in the full low-mass stellar
cluster, and of an stellar age segregation, with the youngest stars still
embedded in the N-S cloud, and more evolved stars more spatially distributed.
The results are consistent with the scenario where an elongated overall
potential well created by the full low-mass stellar cluster funnels gas through
filaments feeding stellar formation. Besides the full gravitational well,
smaller-scale local potential wells created by dense stellar sub-clusters of
low-mass stars are privileged in the competition for the gas of the common
reservoir, allowing the formation of massive stars. We also discuss the
possibility that a stellar collision in the very dense stellar cluster revealed
by Chandra in the DR 21 core is the origin of the large-scale and
highly-energetic outflow arising from this region.


title: An Extension of Cook's Elastic Cipher

abstract:
  Given a block cipher of length L Cook's elastic cipher allows to encrypt
messages of variable length from L to 2L. Given some conditions on the key
schedule, Cook's elastic cipher is secure against any key recovery attack if
the underlying block cipher is, and it achieves complete diffusion in at most q
+ 1 rounds if the underlying block cipher achieves it in q rounds. We extend
Cook's construction inductively, obtaining an elastic cipher for any message
length greater than L with the same properties of security as Cook's elastic
cipher.


title:
Localized States and Quantum Spin Hall Effect in Si-Doped InAs/GaSb
  Quantum Wells

abstract:
  We study localized in-gap states and quantum spin Hall effect in Si-doped
InAs/GaSb quantum wells. We propose a model describing donor and/or acceptor
impurities to describe Si dopants. This model shows in-gap bound states and
wide conductance plateau with the quantized value $2e^2/h$ in light dopant
concentration, consistent with recent experiments by Du et al. We predict a
conductance dip structure due to backward scattering in the region where the
localization length $\xi$ is comparable with the sample width $L_y$ but much
smaller than the sample length $L_x$.


title:
Efficient Opportunistic Sensing using Mobile Collaborative Platform
  MOSDEN

abstract:
  Mobile devices are rapidly becoming the primary computing device in people's
lives. Application delivery platforms like Google Play, Apple App Store have
transformed mobile phones into intelligent computing devices by the means of
applications that can be downloaded and installed instantly. Many of these
applications take advantage of the plethora of sensors installed on the mobile
device to deliver enhanced user experience. The sensors on the smartphone
provide the opportunity to develop innovative mobile opportunistic sensing
applications in many sectors including healthcare, environmental monitoring and
transportation. In this paper, we present a collaborative mobile sensing
framework namely Mobile Sensor Data EngiNe (MOSDEN) that can operate on
smartphones capturing and sharing sensed data between multiple distributed
applications and users. MOSDEN follows a component-based design philosophy
promoting reuse for easy and quick opportunistic sensing application
deployments. MOSDEN separates the application-specific processing from the
sensing, storing and sharing. MOSDEN is scalable and requires minimal
development effort from the application developer. We have implemented our
framework on Android-based mobile platforms and evaluate its performance to
validate the feasibility and efficiency of MOSDEN to operate collaboratively in
mobile opportunistic sensing applications. Experimental outcomes and lessons
learnt conclude the paper.


title: IBEX, SWCX and a Consistent Model for the Local ISM

abstract:
  The Local Interstellar Medium (LISM) makes its presence felt in the
heliosphere in a number of ways including inflowing neutral atoms and dust and
shaping of the heliosphere via its ram pressure and magnetic field. Modelers of
the heliosphere need to know the ISM density and magnetic field as boundary
conditions while ISM modelers would like to use the data and models of the
heliosphere to constrain the nature of the LISM. An important data set on the
LISM is the diffuse soft X-ray background (SXRB), which is thought to originate
in hot gas that surrounds the local interstellar cloud (LIC) in which the
heliosphere resides. However, in the past decade or so it has become clear that
there is a significant X-ray foreground due to emission within the heliosphere
generated when solar wind ions charge exchange with inflowing neutrals. The
existence of this SWCX emission complicates the interpretation of the SXRB. We
discuss how data from IBEX and models for the Ribbon in particular provide the
possibility of tying together heliosphere models with models for the LISM,
providing a consistent picture for the pressure in the LISM, the ionization in
the LIC and the size and shape of the heliosphere.


title: Discretely sampled signals and the rough Hoff process

abstract:
  We introduce a canonical method for transforming a discrete sequential data
set into an associated rough path made up of lead-lag increments. In
particular, by sampling a $d$-dimensional continuous semimartingale $X:[0,1]
\rightarrow \mathbb{R}^d$ at a set of times $D=(t_i)$, we construct a piecewise
linear, axis-directed process $X^D: [0,1] \rightarrow\mathbb{R}^{2d}$ comprised
of a past and future component. We call such an object the Hoff process
associated with the discrete data $\{X_{t}\}_{t_i\in D}$. The Hoff process can
be lifted to its natural rough path enhancement and we consider the question of
convergence as the sampling frequency increases. We prove that the It\^{o}
integral can be recovered from a sequence of random ODEs driven by the
components of $X^D$. This is in contrast to the usual Stratonovich integral
limit suggested by the classical Wong-Zakai Theorem. Such random ODEs have a
natural interpretation in the context of mathematical finance.


title:
Distributional behavior of time averages of non-$L^1$ observables in
  one-dimensional intermittent maps with infinite invariant measures

abstract:
  In infinite ergodic theory, two distributional limit theorems are well-known.
One is characterized by the Mittag-Leffler distribution for time averages of
$L^1(m)$ functions, i.e., integrable functions with respect to an infinite
invariant measure. The other is characterized by the generalized arc-sine
distribution for time averages of non-$L^1(m)$ functions. Here, we provide
another distributional behavior of time averages of non-$L^1(m)$ functions in
one-dimensional intermittent maps where each has an indifferent fixed point and
an infinite invariant measure. Observation functions considered here are
non-$L^1(m)$ functions which vanish at the indifferent fixed point. We call
this class of observation functions weak non-$L^1(m)$ function. Our main result
represents a first step toward a third distributional limit theorem, i.e., a
distributional limit theorem for this class of observables, in infinite ergodic
theory. To prove our proposition, we propose a stochastic process induced by a
renewal process to mimic a Birkoff sum of a weak non-$L^1(m)$ function in the
one-dimensional intermittent maps.


title: Understanding the Chain Fountain

abstract:
  If a chain is initially at rest in a beaker at a height h1 above the ground,
and the end of the chain is pulled over the rim of the beaker and down towards
the ground and then released, the chain will spontaneously "flow" out of the
beaker under gravity. Furthermore, the beads do not simply drag over the edge
of the beaker but form a fountain reaching a height h2 above it. We show that
the formation of a fountain requires that the beads come into motion not only
by being pulled upwards by the part of the chain immediately above the pile,
but also by being pushed upwards by an anomalous reaction force from the pile
of stationary chain. We propose possible origins for this force, argue that its
magnitude will be proportional to the square of the chain velocity, and predict
and verify experimentally that h2 is proportional to h1.


title:
Comparison of H2 and He carbon cleaning mechanisms in extreme
  ultraviolet induced and surface wave discharge plasmas

abstract:
  Cleaning of contamination of optical surfaces by amorphous carbon (a-C) is
highly relevant for extreme ultraviolet (EUV) lithography. We have studied the
mechanisms for a-C removal from a Si surface. By comparing a-C removal in a
surface wave discharge (SWD) plasma and an EUV-induced plasma, the cleaning
mechanisms for hydrogen and helium gas environments were determined. The C-atom
removal per incident ion was estimated for different sample bias voltages and
ion fluxes. It was found that H2 plasmas generally had higher cleaning rates
than He plasmas: up to seven times higher for more negatively biased samples in
EUV induced plasma. Moreover, for H2, EUV induced plasma was found to be 2-3
times more efficient at removing carbon than the SWD plasma. It was observed
carbon removal during exposure to He is due to physical sputtering by He+ ions.
In H2, on the other hand, the increase in carbon removal rates is due to
chemical sputtering. This is a new C cleaning mechanism for EUV-induced plasma,
which we call "EUV-reactive ion sputtering".


title:
Mapping the intramolecular signal transduction of G-protein coupled
  receptors

abstract:
  G-protein coupled receptors (GPCRs), a major gatekeeper of extracellular
signals on plasma membrane, are unarguably one of the most important
therapeutic targets. Given the recent discoveries of allosteric modulations, an
allosteric wiring diagram of intramolecular signal transductions would be of
great use to glean the mechanism of receptor regulation. Here, by evaluating
betweenness centrality ($C_B$) of each residue, we calculate maps of
information flow in GPCRs and identify key residues for signal transductions
and their pathways. Compared with preexisting approaches, the allosteric
hotspots that our $C_B$-based analysis detects for A$_{2A}$ adenosine receptor
(A$_{2A}$AR) and bovine rhodopsin are better correlated with biochemical data.
In particular, our analysis outperforms other methods in locating the rotameric
microswitches, which are generally deemed critical for mediating orthosteric
signaling in class A GPCRs. For A$_{2A}$AR, the inter-residue cross-correlation
map, calculated using equilibrium structural ensemble from molecular dynamics
simulations, reveals that strong signals of long-range transmembrane
communications exist only in the agonist-bound state. A seemingly subtle
variation in structure, found in different GPCR subtypes or imparted by agonist
bindings or a point mutation at an allosteric site, can lead to a drastic
difference in the map of signaling pathways and protein activity. The signaling
map of GPCRs provides valuable insights into allosteric modulations as well as
reliable identifications of orthosteric signaling pathways.


title: Collective excitations in neutron-star crusts

abstract:
  We explore the spectrum of low-energy collective excitations in the crust of
a neutron star, especially in the inner region where neutron-proton clusters
are immersed in a sea of superfluid neutrons. The speeds of the different modes
are calculated systematically from the nuclear energy density functional theory
using a Skyrme functional fitted to essentially all experimental atomic mass
data.


title: On the Griesmer Bound for Systematic Codes

abstract:
  We generalize the Griesmer bound in the case of systematic codes over a field
of size q greater than the distance d of the code. We also generalize the
Griesmer bound in the case of any systematic code of distance 2,3,4 and in the
case of binary systematic codes of distance up to 6.


title: Parallelizable adiabatic gate teleportation

abstract:
  We introduce a twisted Heisenberg-type interaction Hamiltonian, a
Heisenberg-type spin interaction where the coordinates of the second qubit are
twisted according to a unitary gate. We develop parallelizable adiabatic gate
teleportation (PAGT) where a sequence of unitary gates is performed in a single
step of the adiabatic process. In PAGT, numeric calculations suggest the
necessary time for the adiabatic evolution implementing a sequence of $L$
unitary gates increases at most as $O(L^5)$. However, we show that it has the
interesting property that it can map the temporal order of gates to the spatial
order of interactions specified by the final Hamiltonian. Using this property,
we present a controlled-PAGT scheme to manipulate the order of gates by a
control-qubit. In the controlled-PAGT scheme, two differently ordered
sequential unitary gates $FG$ and $GF$ are coherently performed depending on
the state of a control-qubit by simultaneously applying the twisted
Heisenberg-type interaction Hamiltonians implementing unitary gates $F$ and
$G$. We investigate why the twisted Heisenberg-type interaction Hamiltonian
allows PAGT. We show that the twisted Heisenberg-type interaction Hamiltonian
has an ability to perform a transposed unitary gate by just modifying the space
ordering of the final Hamiltonian implementing a unitary gate in adiabatic gate
teleportation. The dynamics generated by the time-reversed Hamiltonian
represented by the transposed unitary gate enables deterministic simulation of
a postselected event of parallelized gate teleportation in adiabatic
implementation.


title: Center manifolds for infinite dimensional random dynamical systems

abstract:
  Stochastic center manifolds theory are crucial in modelling the dynamical
behavior of complex systems under stochastic influences. A multiplicative
ergodic theorem on Hilbert space is proved to be satisfied to the exponential
trichotomy condition. Then the existence of stochastic center manifolds for
infinite dimensional random dynamical systems is shown under the assumption of
exponential trichotomy. The theory provides a support for the discretisations
of nonlinear stochastic partial differential equations with space-time white
noise.


title:
Additive invariants of toric and twisted projective homogeneous
  varieties via noncommutative motives

abstract:
  I. Panin proved in the nineties that the algebraic K-theory of twisted
projective homogeneous varieties can be expressed in terms of central simple
algebras. Later, Merkurjev and Panin described the algebraic K-theory of toric
varieties as a direct summand of the algebraic K-theory of separable algebras.
In this article, making use of the recent theory of noncommutative motives, we
extend Panin and Merkurjev-Panin computations from algebraic K-theory to every
additive invariant. As a first application, we fully compute the cyclic
homology (and all its variants) of twisted projective homogeneous varieties. As
a second application, we show that the noncommutative motive of a twisted
projective homogeneous variety is trivial if and only if the Brauer classes of
the associated central simple algebras are trivial. Along the way we construct
a fully-faithful tensor functor from Merkurjev-Panin's motivic category to
Kontsevich's category of noncommutative Chow motives, which is of independent
interest.


title: Homogenization of the spectral equation in one-dimension

abstract:
  The asymptotic behavior of a one-dimensional spectral problem with periodic
coefficient is addressed for high frequency modes by a method of Bloch wave
homogenization. The analysis leads to a spectral problem including both
microscopic and macroscopic eigenmodes. Numerical simulation results are
provided to corroborate the theory.


title: Absence of phase transition in the XY-model on Menger sponge

abstract:
  We have performed a Monte Carlo study of the classical XY-model on a Menger
sponge with the Wolff cluster algorithm (U. Wolff, 1989). The Menger sponge is
a fractal object with infinite order of ramification and fractal dimension D =
log(20)/log(3) = 2.7268. From the dependence of the helicity modulus on system
size and on boundary conditions, we conclude that there is no phase transition
in the system at any finite temperature.


title:
Aggregated functional data model for Near-Infrared Spectroscopy
  calibration and prediction

abstract:
  Calibration and prediction for NIR spectroscopy data are performed based on a
functional interpretation of the Beer-Lambert formula. Considering that, for
each chemical sample, the resulting spectrum is a continuous curve obtained as
the summation of overlapped absorption spectra from each analyte plus a
Gaussian error, we assume that each individual spectrum can be expanded as a
linear combination of B-splines basis. Calibration is then performed using two
procedures for estimating the individual analytes curves: basis smoothing and
smoothing splines. Prediction is done by minimizing the square error of
prediction. To assess the variance of the predicted values, we use a
leave-one-out jackknife technique. Departures from the standard error models
are discussed through a simulation study, in particular, how correlated errors
impact on the calibration step and consequently on the analytes' concentration
prediction. Finally, the performance of our methodology is demonstrated through
the analysis of two publicly available datasets.


title: On pricing kernels, information and risk

abstract:
  We discuss the finding that cross-sectional characteristic based models have
yielded portfolios with higher excess monthly returns but lower risk than their
arbitrage pricing theory counterparts in an analysis of equity returns of
stocks listed on the JSE. Under the assumption of general no-arbitrage
conditions, we argue that evidence in favour of characteristic based pricing
implies that information is more likely assimilated by means of nonlinear
pricing kernels for the markets considered.


title: Evolving surface finite element method for the Cahn-Hilliard equation

abstract:
  We use the evolving surface finite element method to solve a Cahn- Hilliard
equation on an evolving surface with prescribed velocity. We start by deriving
the equation using a conservation law and appropriate transport for- mulae and
provide the necessary functional analytic setting. The finite element method
relies on evolving an initial triangulation by moving the nodes accord- ing to
the prescribed velocity. We go on to show a rigorous well-posedness result for
the continuous equations by showing convergence, along a subse- quence, of the
finite element scheme. We conclude the paper by deriving error estimates and
present various numerical examples.