title:
Gradient estimate of a Neumann eigenfunction on a compact manifold with
  boundary

abstract:
  Let $e_\l(x)$ be a Neumann eigenfunction with respect to the positive
Laplacian $\Delta$ on a compact Riemannian manifold $M$ with boundary such that
$\Delta\, e_\l=\l^2 e_\l$ in the interior of $M$ and the normal derivative of
$e_\l$ vanishes on the boundary of $M$. Let $\chi_\lambda$ be the unit band
spectral projection operator associated with the Neumann Laplacian and $f$ a
square integrable function on $M$. We show the following gradient estimate for
$\chi_\lambda\,f$ as $\lambda\geq 1$: $\|\nabla\ \chi_\l\ f\|_\infty\leq C\l
\|\chi_\l\f\|_\infty+\l^{-1}\|\Delta\ \chi_\l\ f\|_\infty$, where $C$ is a
positive constant depending only on $M$. As a corollary, we obtain the gradient
estimate of $e_\l$: for every $\l\geq 1$, there holds $\|\nabla
e_\l\|_\infty\leq C\,\l\, \|e_\l\|_\infty$.


title:
The Influence of Thermal Pressure on Equilibrium Models of Hypermassive
  Neutron Star Merger Remnants

abstract:
  The merger of two neutron stars leaves behind a rapidly spinning hypermassive
object whose survival is believed to depend on the maximum mass supported by
the nuclear equation of state, angular momentum redistribution by
(magneto-)rotational instabilities, and spindown by gravitational waves. The
high temperatures (~5-40 MeV) prevailing in the merger remnant may provide
thermal pressure support that could increase its maximum mass and, thus, its
life on a neutrino-cooling timescale. We investigate the role of thermal
pressure support in hypermassive merger remnants by computing sequences of
spherically-symmetric and axisymmetric uniformly and differentially rotating
equilibrium solutions to the general-relativistic stellar structure equations.
Using a set of finite-temperature nuclear equations of state, we find that hot
maximum-mass critically spinning configurations generally do not support larger
baryonic masses than their cold counterparts. However, subcritically spinning
configurations with mean density of less than a few times nuclear saturation
density yield a significantly thermally enhanced mass. Even without decreasing
the maximum mass, cooling and other forms of energy loss can drive the remnant
to an unstable state. We infer secular instability by identifying approximate
energy turning points in equilibrium sequences of constant baryonic mass
parametrized by maximum density. Energy loss carries the remnant along the
direction of decreasing gravitational mass and higher density until instability
triggers collapse. Since configurations with more thermal pressure support are
less compact and thus begin their evolution at a lower maximum density, they
remain stable for longer periods after merger.


title: Graviton scattering amplitudes and Pure Connection Formulation of GR

abstract:
  We show how the recently introduced "Pure Connection Formulation" of gravity
provides a natural framework for approaching the problem of computing graviton
scattering amplitudes. In particular, we show that the interaction vertices are
greatly simplified in this formalism as compared to the Einstein-Hilbert
perturbation theory. This, in turns, leads to very simple Feynman rules that we
employ for the direct computations. Furthermore, this framework naturally
extends to wider class of gravitational theories, which encompasses General
Relativity as a special case. We compute all the possible tree-level
graviton-graviton scattering amplitudes for a general theory from this class.
In the GR case the results are in complete accordance with the known
expressions in the literature. Moreover, for the general theory distinct from
GR, we find new tree-level parity-violating amplitudes. The presence of this
new amplitudes is a direct consequence of the fact that the general theory does
not exhibit explicit parity invariance.


title:
Distributed Inference with M-ary Quantized Data in the Presence of
  Byzantine Attacks

abstract:
  The problem of distributed inference with M-ary quantized data at the sensors
is investigated in the presence of Byzantine attacks. We assume that the
attacker does not have knowledge about either the true state of the phenomenon
of interest, or the quantization thresholds used at the sensors. Therefore, the
Byzantine nodes attack the inference network by modifying modifying the symbol
corresponding to the quantized data to one of the other M symbols in the
quantization alphabet-set and transmitting the false symbol to the fusion
center (FC). In this paper, we find the optimal Byzantine attack that blinds
any distributed inference network. As the quantization alphabet size increases,
a tremendous improvement in the security performance of the distributed
inference network is observed.
  We also investigate the problem of distributed inference in the presence of
resource-constrained Byzantine attacks. In particular, we focus our attention
on two problems: distributed detection and distributed estimation, when the
Byzantine attacker employs a highly-symmetric attack. For both the problems, we
find the optimal attack strategies employed by the attacker to maximally
degrade the performance of the inference network. A reputation-based scheme for
identifying malicious nodes is also presented as the network's strategy to
mitigate the impact of Byzantine threats on the inference performance of the
distributed sensor network.


title: Hybrid Indexes for Repetitive Datasets

abstract:
  Advances in DNA sequencing mean databases of thousands of human genomes will
soon be commonplace. In this paper we introduce a simple technique for reducing
the size of conventional indexes on such highly repetitive texts. Given upper
bounds on pattern lengths and edit distances, we preprocess the text with LZ77
to obtain a filtered text, for which we store a conventional index. Later,
given a query, we find all matches in the filtered text, then use their
positions and the structure of the LZ77 parse to find all matches in the
original text. Our experiments show this also significantly reduces query
times.


title: Conformal scaling and the size of $m$-hadrons

abstract:
  The scaling laws in an infrared conformal (IR) theory are dictated by the
critical exponents of relevant operators. We have investigated these scaling
laws at leading order in two previous papers. In this work we investigate
further consequences of the scaling laws, trying to identify potential
signatures that could be studied by lattice simulations. From the first
derivative of the form factor we derive the behaviour of the mean charge radius
of the hadronic states in the theory. We obtain $\langle r_H^2 \rangle \sim
m^{-2/(1+\gamma^*_m)}$ which is consistent with $\langle r_H^2 \rangle \sim
1/M_H^{2}$. The mean charge radius can be used as an alternative observable to
assess the size of the physical states, and hence finite size effects, in
numerical simulations. Furthermore, we discuss the behaviour of specific field
correlators in coordinate space for the case of conformal, scale-invariant, and
confining theories making use of selection rules in scaling dimensions and
spin. We compute the scaling corrections to correlations functions by
linearizing the renormalization group equations. We find that these correction
are potentially large close to the edge of the conformal window. As an
application we compute the scaling correction to the formula $M_H \sim
m^{1/(1+\gamma_m^*)}$ directly through its associated correlator as well as
through the trace anomaly. The two computations are shown to be equivalent
through a generalisation of the Feynman-Hellmann theorem for the fermion mass,
and the gauge coupling.


title: Tomographic Discord and Quantum Correlations for System of Qubits

abstract:
  The difference of quantum mutual information for bipartite system of qubits
and minimum taken with respect to local unitary transformation group is
introduced as a characteristic of quantum correlations.The two qubits example
(and specifically the two qubits X state) is studied in some details.


title: An Algorithm to Find Optimal Attack Paths in Nondeterministic Scenarios

abstract:
  As penetration testing frameworks have evolved and have become more complex,
the problem of controlling automatically the pentesting tool has become an
important question. This can be naturally addressed as an attack planning
problem. Previous approaches to this problem were based on modeling the actions
and assets in the PDDL language, and using off-the-shelf AI tools to generate
attack plans. These approaches however are limited. In particular, the planning
is classical (the actions are deterministic) and thus not able to handle the
uncertainty involved in this form of attack planning.
  We herein contribute a planning model that does capture the uncertainty about
the results of the actions, which is modeled as a probability of success of
each action. We present efficient planning algorithms, specifically designed
for this problem, that achieve industrial-scale runtime performance (able to
solve scenarios with several hundred hosts and exploits). These algorithms take
into account the probability of success of the actions and their expected cost
(for example in terms of execution time, or network traffic generated).
  We thus show that probabilistic attack planning can be solved efficiently for
the scenarios that arise when assessing the security of large networks. Two
"primitives" are presented, which are used as building blocks in a framework
separating the overall problem into two levels of abstraction. We also present
the experimental results obtained with our implementation, and conclude with
some ideas for further work.


title: Bayesian Monotone Regression using Gaussian Process Projection

abstract:
  Shape constrained regression analysis has applications in dose-response
modeling, environmental risk assessment, disease screening and many other
areas. Incorporating the shape constraints can improve estimation efficiency
and avoid implausible results. We propose two novel methods focusing on
Bayesian monotone curve and surface estimation using Gaussian process
projections. The first projects samples from an unconstrained prior, while the
second projects samples from the Gaussian process posterior. Theory is
developed on continuity of the projection, posterior consistency and rates of
contraction. The second approach is shown to have an empirical Bayes
justification and to lead to simple computation with good performance in finite
samples. Our projection approach can be applied in other constrained function
estimation problems including in multivariate settings.


title:
Prediction of the effective force on DNA in a nanopore based on density
  functional theory

abstract:
  We consider voltage-driving DNA translocation through a nanopore in the
present study. By assuming the DNA is coaxial with the cylindrical nanopore, a
hydrodynamic model for determining effective force on a single DNA molecule in
a nanopore was presented, in which density functional theory (DFT) combined
with the continuum Navier-Stokes (NS) equations is utilized to investigate
electro-osmotic flow and the viscous drag force acting on the DNA inside a
nanopore. Surface charge on the walls of the nanopore is also taken into
account in our model. The consistence between our calculation and the previous
experimental measurement indicates that the present theoretical model is an
effective tool to predict the hydrodynamic resistance on DNA. Results show that
charge inversion, which cannot be obtained by the Poisson-Boltzmann (PB) model,
will reduce electro-osmotic velocity, or even lead to flow reversal for higher
salt concentration. This is helpful to raise the effective force profoundly in
the overscreening region.


title:
Diagrams for perverse sheaves on isotropic Grassmannians and the
  supergroup SOSP(m|2n)

abstract:
  We describe diagrammatically a positively graded Koszul algebra \mathbb{D}_k
such that the category of finite dimensional \mathbb{D}_k-modules is equivalent
to the category of perverse sheaves on the isotropic Grassmannian of type D_k
constructible with respect to the Schubert stratification. The connection is
given by an explicit isomorphism to the endomorphism algebra of a projective
generator described in by Braden. The algebra is obtained by a "folding"
procedure from the generalized Khovanov arc algebras. We relate this algebra to
the category of finite dimensional representations of the orthosymplectic
supergroups. The proposed equivalence of categories gives a concrete
description of the categories of finite dimensional SOSP(m|2n)-modules.


title: Attack Planning in the Real World

abstract:
  Assessing network security is a complex and difficult task. Attack graphs
have been proposed as a tool to help network administrators understand the
potential weaknesses of their network. However, a problem has not yet been
addressed by previous work on this subject; namely, how to actually execute and
validate the attack paths resulting from the analysis of the attack graph. In
this paper we present a complete PDDL representation of an attack model, and an
implementation that integrates a planner into a penetration testing tool. This
allows to automatically generate attack paths for penetration testing
scenarios, and to validate these attacks by executing the corresponding actions
-including exploits- against the real target network. We present an algorithm
for transforming the information present in the penetration testing tool to the
planning domain, and show how the scalability issues of attack graphs can be
solved using current planners. We include an analysis of the performance of our
solution, showing how our model scales to medium-sized networks and the number
of actions available in current penetration testing tools.


title:
Cobordism categories of manifolds with Baas-Sullivan singularities, Part
  2

abstract:
  For a given list of closed manifolds $\Sigma_k=(P_1,...,P_k)$, we construct a
cobordism category $\mathbf{Cob}_{d}^{\Sigma_{k}}$ of embedded manifolds with
Baas-Sullivan singularities of type $\Sigma_k$. Our main results identify the
homotopy type of the classifying spaces $B\mathbf{Cob}_{d}^{\Sigma_{k}}$ of
these cobordism categories with that of the infinite loop-space of a certain
spectrum, $\mathsf{MT}_{\Sigma_{k}}(d)$. Our results generalize of the work of
Galatius, Madsen, Tillmann, and Weiss from arXiv:math/0605249. It also
generalizes the work of Genauer on the cobordism categories of manifolds with
corners from arXiv:0810.0581.


title: The BNS-invariant for the pure braid groups

abstract:
  In 1987 Bieri, Neumann and Strebel introduced a geometric invariant for
discrete groups. In this article we compute and explicitly describe the
BNS-invariant for the pure braid groups.


title:
Localization computation of one-point disk invariants of projective
  Calabi-Yau complete intersections

abstract:
  We define one-point disk invariants of a smooth projective Calabi-Yau (CY)
complete intersection (CI) in the presence of an anti-holomorphic involution
via localization. We show that these invariants are rational numbers and obtain
a formula for them which confirms, in particular, a conjecture by
Jinzenji-Shimizu.


title: Drawing Permutations with Few Corners

abstract:
  A permutation may be represented by a collection of paths in the plane. We
consider a natural class of such representations, which we call tangles, in
which the paths consist of straight segments at 45 degree angles, and the
permutation is decomposed into nearest-neighbour transpositions. We address the
problem of minimizing the number of crossings together with the number of
corners of the paths, focusing on classes of permutations in which both can be
minimized simultaneously. We give algorithms for computing such tangles for
several classes of permutations.


title: Nonstandard Analysis: Its Creator and Place

abstract:
  This is a biographical sketch and tribute to Abraham Robinson (1918-1974) on
the 95th anniversary of his birth with a short discussion of the place of
nonstandard analysis in the present-day mathematics.


title: Color Dispersion and Milky Way Reddening Among Type Ia Supernovae

abstract:
  Past analyses of Type Ia Supernovae (SNe Ia) have identified an irreducible
scatter of 5-10% in distance widely attributed to an intrinsic dispersion in
luminosity. Another, equally valid, source of this scatter is intrinsic
dispersion in color. Misidentification of the true source of this scatter can
bias both the retrieved color-luminosity relation and cosmological parameter
measurements. The size of this bias depends on the magnitude of the intrinsic
color dispersion relative to the distribution of colors that correlate with
distance. We produce a realistic simulation of a misattribution of intrinsic
scatter, and find a negative bias in the recovered color-luminosity relation,
beta, of dbeta -1.0 (~33%) and a positive bias in the equation of state
parameter, w, of dw +0.04 (~4%). We re-analyze current published data sets with
the assumptions that the distance scatter is predominantly the result of color.
Unlike previous analyses, we find that the data are consistent with a Milky Way
reddening law R_V=3.1, and that a Milky Way dust model better predicts the
asymmetric color-luminosity trends than the conventional luminosity scatter
hypothesis. We also determine that accounting for color variation reduces the
correlation between various Host galaxy properties and Hubble residuals by
~20%.


title: Day-Night Asymmetries in Active-Sterile Solar Neutrino Oscillations

abstract:
  Day-night asymmetries in active-sterile solar neutrino oscillations are
discussed in the general $3+N_{s}$ mixing framework with three active and N_s
sterile neutrinos. Analytical expressions of the probability of neutrino flavor
transitions in the Earth in the perturbative approximation and in the slab
approximation are presented and the effects of active-sterile mixing and of the
CP-violating phases are discussed. The accuracy of the analytical
approximations and the properties of the day-night asymmetries are illustrated
numerically in the 3+1 neutrino mixing framework.


title:
Target Localization in Wireless Sensor Networks using Error Correcting
  Codes

abstract:
  In this work, we consider the task of target localization using quantized
data in Wireless Sensor Networks (WSNs). We propose an energy efficient
localization scheme by modeling it as an iterative classification problem. We
design coding based iterative approaches for target localization where at every
iteration, the Fusion Center (FC) solves an M-ary hypothesis testing problem
and decides the Region of Interest (ROI) for the next iteration. The coding
based iterative approach works well even in the presence of Byzantine
(malicious) sensors in the network. We further consider the effect of non-ideal
channels. We suggest the use of soft-decision decoding to compensate for the
loss due to the presence of fading channels between the local sensors and the
FC. We evaluate the performance of the proposed schemes in terms of the
Byzantine fault tolerance capability and probability of detection of the target
region. We also present performance bounds which help us in designing the
system. We provide asymptotic analysis of the proposed schemes and show that
the schemes achieve perfect region detection irrespective of the noise variance
when the number of sensors tends to infinity. Our numerical results show that
the proposed schemes provide a similar performance in terms of Mean Square
Error (MSE) as compared to the traditional Maximum Likelihood Estimation (MLE)
but are computationally much more efficient and are resilient to errors due to
Byzantines and non-ideal channels.


title:
Thirteenth Marcel Grossmann Meeting, Summary of the session, White Dwarf
  Pulsars and Rotating White Dwarf Theory

abstract:
  This is the summary of the parallel session entitled "White Dwarf Pulsars and
Rotating White Dwarf Theory", chaired by Yukikatsu Terada in Thirteenth Marcel
Grossmann Meeting. The origin of cosmic rays remains a mystery, even over 100
years since their discovery. Neutron stars (NSs) are considered textbook cases
of particle acceleration sites in our Galaxy, but many unresolved numerical
problems remain. Searches for new acceleration sites are crucial for
astrophysics. The magnetized white dwarfs (MWDs) have the same kind of rotating
magnetosphere as NSs, and may be the source of up to 10% of galactic cosmic ray
electrons. In the parallel session of the "white dwarf pulsars and rotating
white dwarf theory", we focus on the current observational results on white
dwarf pulsars, related theories of the radiation process both in white dwarfs
and neutron stars, and the origin and rule of white dwarf pulsars, as well as
surveying on the current theories of the internal structure and the equation of
state of white dwarfs.


title:
Excitation spectroscopy of few-electron states in artificial diatomic
  molecules

abstract:
  We study the excitation spectroscopy of few-electron, parallel coupled double
quantum dots (QDs). By applying a finite source drain voltage to a double QD
(DQD), the first excited states observed in nonequilibrium charging diagrams
can be classified into two kinds in terms of the total effective electron
number in the DQD, assuming a core filling. When there are an odd (even) number
of electrons, one (two)-electron antibonding (triplet) state is observed as the
first excited state. On the other hand, at a larger source drain voltage we
observe higher excited states, where additional single-particle excited levels
are involved. Eventually, we identify the excited states with a calculation
using the Hubbard model and, in particular, we elucidate the quadruplet state,
which is normally forbidden by the spin blockade caused by the selection rule.


title:
Evolution of a family of expanding cubic black-hole lattices in
  numerical relativity

abstract:
  We present the numerical evolution of a family of conformally-flat, infinite,
expanding cubic black-hole lattices. We solve for the initial data using an
initial-data prescription presented recently, along with a new multigrid solver
developed for this purpose. We then apply the standard tools of numerical
relativity to calculate the time development of this initial dataset and derive
quantities of cosmological relevance, such as the scaling of proper lengths.
Similarly to the case of S3 lattices, we find that the length scaling remains
close to the analytical solution for Friedmann-Lemaitre-Robertson-Walker
cosmologies throughout our simulations, which span a window of about one order
of magnitude in the growth of the scale factor. We highlight, however, a number
of important departures from the Friedmann-Lemaitre-Robertson-Walker class.


title: Measurable motivic sites

abstract:
  We introduce the notion of a relative limit simplicial partial motivic site
and a corresponding notion of motivic measurability which specializes to the
notion of finite schemic motivic measures of H. Schoutens and the notion of
infinite schemic motivic measures of the author. The advantage to working with
simplicial motivic sites is that it gives the correct notion of the motivic
measure of a derived stacks which have some reasonable finiteness conditions.
This work was partially supported by the Chateaubriand Fellowship.


title: Generation of N-atom W-class states in spatially separated cavities

abstract:
  We propose a feasible and efficient scheme to generate $N$-atom $W$-class
states in spatially separated cavities without using any classical driving
pulses. We adopt the model in which the couplings between different atoms are
mediated only by virtual excitations of the cavity and fiber fields, so the
scheme is insensitive to the cavity decay and fiber photon leakage. We carry
out both theoretical investigation in a decoherence-free subspace and numerical
calculation accounting for decoherence due to the atomic spontaneous emission
as well as the decay of cavity and fiber modes. The theoretical and numerical
results agree in the large atom-cavity detuning regime. Our scheme proves to be
useful in scalable distributed quantum networks.


title:
Scaling limits of correlations of characteristic polynomials for the
  Gaussian beta-ensemble with external source

abstract:
  We study the averaged product of characteristic polynomials of large random
matrices in the Gaussian beta-ensemble perturbed by an external source of
finite rank. We prove that at the edge of the spectrum, the limiting
correlations involve two families of multivariate functions of Airy and
Gaussian types. The precise form of the limiting correlations depends on the
strength of the nonzero eigenvalues of the external source. A critical value
for the latter is obtained and a phase transition phenomenon similar to that of
arXiv:math/0403022 is established. The derivation of our results relies mainly
on previous articles by the authors, which deal with duality formulas
arXiv:0801.3438 and asymptotics for Selberg-type integrals arXiv:1112.1119v3.


title: Deciding Nonnegativity of Polynomials by MAPLE

abstract:
  There have been some effective tools for solving (constant/parametric)
semi-algebraic systems in Maple's library RegularChains since Maple 13. By
using the functions of the library, e.g., RealRootClassfication, one can prove
and discover polynomial inequalities. This paper is more or less a user guide
on using RealRootClassfication to prove the nonnegativity of polynomials. We
show by examples how to use this powerful tool to prove a polynomial is
nonnegative under some polynomial inequality and/or equation constraints. Some
tricks for using the tool are also provided.


title: Estimating Certain Non-Zero Littlewood-Richardson Coefficients

abstract:
  Littlewood Richardson coefficients are structure constants appearing in the
representation theory of the general linear groups ($GL_n$). The main results
of this paper are: 1. A strongly polynomial randomized approximation scheme for
certain Littlewood-Richardson coefficients. 2. A proof of approximate
log-concavity of certain Littlewood-Richardson coefficients.


title:
The London-Anderson-Englert-Brout-Higgs-Guralnik-Hagen-Kibble-Weinberg
  mechanism and Higgs boson reveal the unity and future excitement of physics

abstract:
  The particle recently discovered by the CMS and ATLAS collaborations at CERN
is almost certainly a Higgs boson, fulfilling a quest that can be traced back
to three seminal high energy papers of 1964, but which is intimately connected
to ideas in other areas of physics that go back much further. One might
oversimplify the history of the features which (i) give mass to the W and Z
particles that mediate the weak nuclear interaction, (ii) effectively break
gauge invariance, (iii) eliminate physically unacceptable Nambu-Goldstone
bosons, and (iv) give mass to fermions (like the electron) by collectively
calling them the
London-Anderson-Englert-Brout-Higgs-Guralnik-Hagen-Kibble-Weinberg mechanism.
More important are the implications for the future: a Higgs boson appears to
point toward supersymmetry, since new physics is required to protect its mass
from enormous quantum corrections, while the discovery of neutrino masses seems
to point toward grand unification of the nongravitational forces.

categories: hep-ph cond-mat.supr-con hep-th quant-ph


title:
Success rates for linear optical generation of cluster states in
  coincidence basis

abstract:
  We report on theoretical research in photonic cluster-state computing.
Finding optimal schemes of generating non-classical photonic states is of
critical importance for this field as physically implementable photon-photon
entangling operations are currently limited to measurement-assisted stochastic
transformations. A critical parameter for assessing the efficiency of such
transformations is the success probability of a desired measurement outcome. At
present there are several experimental groups which are capable of generating
multi-photon cluster states carrying more than eight qubits. Separate photonic
qubits or small clusters can be fused into a single cluster state by a
probabilistic optical CZ gate conditioned on simultaneous detection of all
photons with 1/9 success probability of each gate. This design mechanically
follows the original theoretical scheme of cluster state generation proposed
more than a decade ago by Raussendorf, Browne and Briegel. The optimality of
the destructive CZ gate in application to linear optical cluster state
generation has not been analyzed previously. Our results reveal that this
method is far from the optimal one. Employing numerical optimization we have
identified that maximal success probability of fusing n unentangled dual-rail
optical qubits into a linear cluster state is equal to 1/2^(n-1); m-tuple of
photonic Bell pair states, commonly generated via spontaneous parametric
down-conversion, can be fused into a single cluster with the maximal success
probability of 1/4^(m-1).


title: Web Service Testing Tools: A Comparative Study

abstract:
  Quality of Service (QoS) has gained more importance with the increase in
usage and adoption of web services. In recent years, various tools and
techniques developed for measurement and evaluation of QoS of web services.
There are commercial as well as open-source tools available today which are
being used for monitoring and testing QoS for web services. These tools
facilitate in QoS measurement and analysis and are helpful in evaluation of
service performance in real-time network. In this paper, we describe three
popular open-source tools and compare them in terms of features, usability,
performance, and software requirements. Results of the comparison will help in
adoption and usage of these tools, and also promote development and usage of
open-source web service testing tools.


title: A surrogate for networks -- How scale-free is my scale-free network?

abstract:
  Complex networks are now being studied in a wide range of disciplines across
science and technology. In this paper we propose a method by which one can
probe the properties of experimentally obtained network data. Rather than just
measuring properties of a network inferred from data, we aim to ask how typical
is that network? What properties of the observed network are typical of all
such scale free networks, and which are peculiar? To do this we propose a
series of methods that can be used to generate statistically likely complex
networks which are both similar to the observed data and also consistent with
an underlying null-hypothesis -- for example a particular degree distribution.
There is a direct analogy between the approach we propose here and the
surrogate data methods applied to nonlinear time series data.

categories: physics.soc-ph cs.SI nlin.AO physics.data-an


title: Matter effects on binary neutron star waveforms

abstract:
  Using an extended set of equations of state and a multiple-group
multiple-code collaborative effort to generate waveforms, we improve
numerical-relativity-based data-analysis estimates of the measurability of
matter effects in neutron-star binaries. We vary two parameters of a
parameterized piecewise-polytropic equation of state (EOS) to analyze the
measurability of EOS properties, via a parameter {\Lambda} that characterizes
the quadrupole deformability of an isolated neutron star. We find that, to
within the accuracy of the simulations, the departure of the waveform from
point-particle (or spinless double black-hole binary) inspiral increases
monotonically with {\Lambda}, and changes in the EOS that did not change
{\Lambda} are not measurable. We estimate with two methods the minimal and
expected measurability of {\Lambda} in second- and third- generation
gravitational-wave detectors. The first estimate, using numerical waveforms
alone, shows two EOS which vary in radius by 1.3km are distinguishable in
mergers at 100Mpc. The second estimate relies on the construction of hybrid
waveforms by matching to post-Newtonian inspiral, and estimates that the same
EOS are distinguishable in mergers at 300Mpc. We calculate systematic errors
arising from numerical uncertainties and hybrid construction, and we estimate
the frequency at which such effects would interfere with template-based
searches.


title: MYE: Missing Year Estimation in Academic Social Networks

abstract:
  In bibliometrics studies, a common challenge is how to deal with incorrect or
incomplete data. However, given a large volume of data, there often exists
certain relationships between the data items that can allow us to recover
missing data items and correct erroneous data. In this paper, we study a
particular problem of this sort - estimating the missing year information
associated with publications (and hence authors' years of active publication).
We first propose a simple algorithm that only makes use of the "direct"
information, such as paper citation/reference relationships or paper-author
relationships. The result of this simple algorithm is used as a benchmark for
comparison. Our goal is to develop algorithms that increase both the coverage
(the percentage of missing year papers recovered) and accuracy (mean absolute
error of the estimated year to the real year). We propose some advanced
algorithms that extend inference by information propagation. For each
algorithm, we propose three versions according to the given academic social
network type: a) Homogeneous (only contains paper citation links), b) Bipartite
(only contains paper-author relations), and, c) Heterogeneous (both paper
citation and paper-author relations). We carry out experiments on the three
public data sets (MSR Libra, DBLP and APS), and evaluated by applying the
K-fold cross validation method. We show that the advanced algorithms can
improve both coverage and accuracy.


title: Spiral and never-settling patterns in active suspensions

abstract:
  We present a combined numerical and analytical study of pattern formation in
an active system where particles align, possess a density-dependent motility,
and are subject to a logistic reaction. This is a model for suspensions of
reproducing bacteria, but it can also represent, in the ordered phase,
actomyosin gels in vitro or in vivo. In the disordered phase, we find that
motility suppression and growth compete to yield stable or blinking patterns,
which, when dense enough, acquire internal orientational ordering, to yield
asters or spirals. In the ordered phase, the reaction term leads to previously
unobserved never-settling patterns which can provide a simple framework to
understand the formation of motile and spiral patterns in actin.


title: Higher order Sobol' indices

abstract:
  Sobol' indices measure the dependence of a high dimensional function on
groups of variables defined on the unit cube $[0,1]^d$. They are based on the
ANOVA decomposition of functions, which is an $L^2$ decomposition. In this
paper we discuss generalizations of Sobol' indices which yield $L^p$ measures
of the dependence of $f$ on subsets of variables. Our interest is in values
$p>2$ because then variable importance becomes more about reaching the extremes
of $f$. We introduce two methods. One based on higher order moments of the
ANOVA terms and another based on higher order norms of a spectral decomposition
of $f$, including Fourier and Haar variants. Both of our generalizations have
representations as integrals over $[0,1]^{kd}$ for $k\ge 1$, allowing direct
Monte Carlo or quasi-Monte Carlo estimation. We find that they are sensitive to
different aspects of $f$, and thus quantify different notions of variable
importance.


title:
An Efficient Distributed Data Extraction Method for Mining Sensor
  Networks Data

abstract:
  A wide range of Sensor Networks (SNs) are deployed in real world applications
which generate large amount of raw sensory data. Data mining technique to
extract useful knowledge from these applications is an emerging research area
due to its crucial importance but still its a challenge to discover knowledge
efficiently from the sensor network data. In this paper we proposed a
Distributed Data Extraction (DDE) method to extract data from sensor networks
by applying rules based clustering and association rule mining techniques. A
significant amount of sensor readings sent from the sensors to the data
processing point(s) may be lost or corrupted. DDE is also estimating these
missing values from available sensor reading instead of requesting the sensor
node to resend lost reading. DDE also apply data reduction which is able to
reduce the data size while transmitting to sink. Results show our proposed
approach exhibits the maximum data accuracy and efficient data extraction in
term of the entire networks energy consumption.


title:
Fractional G-White Noise Theory, Wavelet Decomposition for Fractional
  G-Brownian Motion, and Bid-Ask Pricing Application to Finance Under
  Uncertainty

abstract:
  G-framework is presented by Peng [41] for measure risk under uncertainty. In
this paper, we define fractional G-Brownian motion (fGBm). Fractional
G-Brownian motion is a centered G-Gaussian process with zero mean and
stationary increments in the sense of sub-linearity with Hurst index $H\in
(0,1)$. This process has stationary increments, self-similarity, and long rang
dependence properties in the sense of sub-linearity. These properties make the
fractional G-Brownian motion a suitable driven process in mathematical finance.
We construct wavelet decomposition of the fGBm by wavelet with compactly
support. We develop fractional G-white noise theory, define G-It\^o-Wick
stochastic integral, establish the fractional G-It\^o formula and the
fractional G-Clark-Ocone formula, and derive the G-Girsanov's Theorem. For
application the G-white noise theory, we consider the financial market modelled
by G-Wick-It\^o type of SDE driven by fGBm. The financial asset price modelled
by fGBm has volatility uncertainty, using G-Girsanov's Theorem and
G-Clark-Ocone Theorem, we derive that sublinear expectation of the discounted
European contingent claim is the bid-ask price of the claim.


title: A Microcontroller Based Device to Reduce Phanthom Power

abstract:
  In this paper we concern ourselves with the problem of minimizing the standby
power consumption in some of the house hold appliances. Here we propose a
remote controlled device through which we could reduce the amount of standby
power consumed by the electrical appliances connected to it. This device
provides an option of controlling each of the appliances connected to it
individually or as a whole when required. The device has got number of plug
points each of which could be controlled through the remote and also has a
provision of switching off all the points at once.


title: Arguments for Detecting Octaneutrons in Cluster Decay of 252Cf Nuclei

abstract:
  A new method of searching for neutron clusters (multineutrons) composed of
neutrons bound by nuclear forces has been introduced and implemented. The
method is based on the search for daughter nuclei that emerge at the nuclei
cluster decay of 252Cf to neutron clusters. The effect of long-time build-up of
daughter nuclei with a high atomic number and long half-life was utilized. As a
result, the cluster decay of Cf-252 to a daughter nucleus U-232 (half- life of
T1/2= 68.9 years) was discovered. It is assumed that the emergence of U-232
nuclei is attributed to emission of neutron clusters consisting of eight
neutrons - octaneutrons. The emission probability of octaneutrons against
{\alpha}-decay probability of Cf-252 is defined equal to
{\lambda}C/{\lambda}{\alpha} = 1.74*10-6.


title:
Simultaneous measurement of the microscopic dynamics and the mesoscopic
  displacement field in soft systems by speckle imaging

abstract:
  The constituents of soft matter systems such as colloidal suspensions,
emulsions, polymers, and biological tissues undergo microscopic random motion,
due to thermal energy. They may also experience drift motion correlated over
mesoscopic or macroscopic length scales, \textit{e.g.} in response to an
internal or applied stress or during flow. We present a new method for
measuring simultaneously both the microscopic motion and the mesoscopic or
macroscopic drift. The method is based on the analysis of spatio-temporal
cross-correlation functions of speckle patterns taken in an imaging
configuration. The method is tested on a translating Brownian suspension and a
sheared colloidal glass.


title: Fragmenting protostellar disks: properties and observational signatures

abstract:
  Using numerical hydrodynamic simulations, we study the gravitational
fragmentation of an unstable protostellar disc formed during the collapse of a
pre-stellar core with a mass of 1.2 M_sun. The forming fragments span a mass
range from about a Jupiter mass to very-low-mass protostars and are located at
distances from a few tens to a thousand AU, with a dearth of objects at < 100
AU. We explore the possibility of observational detection of the fragments in
discs viewed through the outflow cavity at a distance of 250 pc. We demonstrate
that one hour of integration time with the Atacama Large
Millimeter/sub-millimeter Array (ALMA) is sufficient to detect the fragments
with masses as low as 1.5 M_Jup at orbital distances up to 800 AU from the
protostar. The ALMA resolution sets the limit on the minimum orbital distance
of detectable fragments. For the adopted resolution of our simulated ALMA
images of 0.1", the fragments can be detected at distances down to 50 AU. At
smaller distances, the fragments usually merge with the central density peak.
The likelihood for detecting the fragments reduces significantly for a lower
resolution of 0.5". Some of the most massive fragments, regardless of their
orbital distance, can produce characteristic peaks at approximately 5 micron
and hence their presence can be indirectly inferred from the observed spectral
energy distributions of protostars.


title: Geometric aspects of Pellet's and related theorems

abstract:
  Pellet's theorem determines when the zeros of a polynomial can be separated
into two regions, according to their moduli. We refine one of those regions and
replace it with the closed interior of a lemniscate that provides more precise
information on the location of the zeros. Moreover, Pellet's theorem is
considered the generalization of a zero inclusion region due to Cauchy. Using
linear algebra tools, we derive a different generalization that leads to a
sequence of smaller inclusion regions, which are also the closed interiors of
lemniscates.


title:
Phase Space Dynamics of Ionization Injection in Plasma Based
  Accelerators

abstract:
  The evolution of beam phase space in ionization-induced injection into plasma
wakefields is studied using theory and particle-in-cell (PIC) simulations. The
injection process causes special longitudinal and transverse phase mixing
leading initially to a rapid emittance growth followed by oscillation, decay,
and eventual slow growth to saturation. An analytic theory for this evolution
is presented that includes the effects of injection distance (time),
acceleration distance, wakefield structure, and nonlinear space charge forces.
Formulas for the emittance in the low and high space charge regimes are
presented. The theory is verified through PIC simulations and a good agreement
is obtained. This work shows how ultra-low emittance beams can be produced
using ionization-induced injection.


title:
Spectral variability of IRAS 18325-5926 and constraints on the geometry
  of the scattering medium

abstract:
  We analyze Suzaku and XMM-Newton data of the highly variable Seyfert 2, IRAS
18325-5926. The spectra of the source are well modeled as a primary component
described as an absorbed power law and a secondary power law component which is
consistent with being scattered emission from an on-axis extended highly
ionized medium. We show that while the primary component varies on a wide range
of timescales from $10^{4} - 10^{8}$ s, the scattered emission is variable only
on timescales longer than $10^{5}$ s. This implies that the extent of the
scattering medium is greater than $10^{16}$ cm. The ratio of the scattered to
primary flux ($\sim 0.03$) implies a column density for the scattering medium
to be $\sim 10^{23}$ cm$^{-2}$. We argue that for such a medium to be highly
ionized it must be located less than $10^{17}$ cm from the X-ray source. Thus
we localize the position and extent of scattering region to be $\sim$ a few
$\times 10^{16}$ cm, with an average particle density of $\sim 10^{6}$
cm$^{-3}$. We consider the physical interpretation of these results and as an
aside, we confirm the presence of a broad Iron line emission in both the {\it
XMM-Newton} and {\it Suzaku} observations.


title: Computably regular topological spaces

abstract:
  This article continues the study of computable elementary topology started by
the author and T. Grubba in 2009 and extends the author's 2010 study of axioms
of computable separation. Several computable T3- and Tychonoff separation
axioms are introduced and their logical relation is investigated. A number of
implications between these axioms are proved and several implications are
excluded by counter examples, however, many questions have not yet been
answered. Known results on computable metrization of T3-spaces from M.
Schr/"oder (1998) and T. Grubba, M. Schr/"oder and the author (2007) are proved
under uniform assumptions and with partly simpler proofs, in particular, the
theorem that every computably regular computable topological space with
non-empty base elements can be embedded into a computable metric space. Most of
the computable separation axioms remain true for finite products of spaces.


title: A Novel Block-DCT and PCA Based Image Perceptual Hashing Algorithm

abstract:
  Image perceptual hashing finds applications in content indexing, large-scale
image database management, certification and authentication and digital
watermarking. We propose a Block-DCT and PCA based image perceptual hash in
this article and explore the algorithm in the application of tamper detection.
The main idea of the algorithm is to integrate color histogram and DCT
coefficients of image blocks as perceptual feature, then to compress perceptual
features as inter-feature with PCA, and to threshold to create a robust hash.
The robustness and discrimination properties of the proposed algorithm are
evaluated in detail. Our algorithms first construct a secondary image, derived
from input image by pseudo-randomly extracting features that approximately
capture semi-global geometric characteristics. From the secondary image (which
does not perceptually resemble the input), we further extract the final
features which can be used as a hash value (and can be further suitably
quantized). In this paper, we use spectral matrix invariants as embodied by
Singular Value Decomposition. Surprisingly, formation of the secondary image
turns out be quite important since it not only introduces further robustness,
but also enhances the security properties. Indeed, our experiments reveal that
our hashing algorithms extract most of the geometric information from the
images and hence are robust to severe perturbations (e.g. up to %50 cropping by
area with 20 degree rotations) on images while avoiding misclassification.
Experimental results show that the proposed image perceptual hash algorithm can
effectively address the tamper detection problem with advantageous robustness
and discrimination.


title:
Parallel Coordinate Descent Newton Method for Efficient
  $\ell_1$-Regularized Minimization

abstract:
  The recent years have witnessed advances in parallel algorithms for large
scale optimization problems. Notwithstanding demonstrated success, existing
algorithms that parallelize over features are usually limited by divergence
issues under high parallelism or require data preprocessing to alleviate these
problems. In this work, we propose a Parallel Coordinate Descent Newton
algorithm using multidimensional approximate Newton steps (PCDN), where the
off-diagonal elements of the Hessian are set to zero to enable parallelization.
It randomly partitions the feature set into $b$ bundles/subsets with size of
$P$, and sequentially processes each bundle by first computing the descent
directions for each feature in parallel and then conducting $P$-dimensional
line search to obtain the step size. We show that: (1) PCDN is guaranteed to
converge globally despite increasing parallelism; (2) PCDN converges to the
specified accuracy $\epsilon$ within the limited iteration number of
$T_\epsilon$, and $T_\epsilon$ decreases with increasing parallelism (bundle
size $P$). Using the implementation technique of maintaining intermediate
quantities, we minimize the data transfer and synchronization cost of the
$P$-dimensional line search. For concreteness, the proposed PCDN algorithm is
applied to $\ell_1$-regularized logistic regression and $\ell_2$-loss SVM.
Experimental evaluations on six benchmark datasets show that the proposed PCDN
algorithm exploits parallelism well and outperforms the state-of-the-art
methods in speed without losing accuracy.


title: Computing the truncated theta function via Mordell integral

abstract:
  Hiary [3] has presented an algorithm which allows to evaluate the truncated
theta function $\sum_{k=0}^n \exp(2\pi \i (zk+\tau k^2))$ to within $\pm
\epsilon$ in $O(\ln(\tfrac{n}{\epsilon})^{\kappa})$ arithmetic operations for
any real $z$ and $\tau$. This remarkable result has many applications in Number
Theory, in particular it is the crucial element in Hiary's algorithm for
computing $\zeta(\tfrac{1}{2}+\i t)$ to within $\pm t^{-\lambda}$ in
$O_{\lambda}(t^{\frac{1}{3}}\ln(t)^{\kappa})$ arithmetic operations, see [2].
We present a significant simplification of Hiary's algorithm for evaluating the
truncated theta function. Our method avoids the use of the Poisson summation
formula, and substitutes it with an explicit identity involving the Mordell
integral. This results in an algorithm which is efficient, conceptually simple
and easy to implement.


title:
Energy efficient routing in mobile ad-hoc networks for Healthcare
  Environments

abstract:
  The modern and innovative medical applications based on wireless network are
being developed in the commercial sectors as well as in research. The emerging
wireless networks are rapidly becoming a fundamental part of medical solutions
due to increasing accessibility for healthcare professionals/patients reducing
healthcare costs. Discovering the routes among hosts that are energy efficient
without compromise on smooth communication is desirable. This work investigates
energy efficiency of some selected proactive and reactive routing protocols in
wireless network for healthcare environments. After simulation and analysis we
found that DSR is best energy efficient routing protocol among DSR, DSDV and
AODV, because DSR has maximum remaining energy.


title: Modeling the guaranteed delivery of bulk data

abstract:
  The delivery of bulk data is an increasingly pressing problem in modern
networks. While in some cases these transfers happen in background without
specific constraints in terms of delivery times, there are a number of
scenarios in which the transfer of tens of GB of data must occur in specific,
limited time windows. In order to face this task, a suitable solution is the
deployment of virtual links with guaranteed bandwidth between endpoints
provided by a Service Overlay Network (SON) provider. We model this scenario as
an optimization problem, in which the target consists of minimizing the costs
of the virtual links provided by the SON and the unknowns are the provisioned
bandwidths of these links. Since the resulting objective function is neither
continuous nor convex, the solution of this problem is really challenging for
standard optimization tools in terms of both convergence time and solution
optimality. We propose a solution based on an heuristic approach which uses the
min-plus algebra. Numerical results show that the proposed heuristic
outperforms the considered optimization tools, whilst maintaining an affordable
computation time.


title:
Space Group Symmetry Classification of Energy Bands in Graphene and
  Destruction of Dirac Points by Supercell Potential

abstract:
  In the previous publications (E. Kogan and V. U. Nazarov, Phys. Rev. B {\bf
85}, 115418 (2012) and E. Kogan, Graphene {\bf 2}, 74 (2013)) we presented
point group symmetry classification of energy bands in graphene. In the present
note we generalize classification by considering the space group symmetry. Also
in the framework of group theory we describe destruction of the Dirac points in
graphene by a supercell potential.


title: Blended Learning or E-learning?

abstract:
  ICT or Information and Communication Technology has pervaded the fields of
education.In recent years the term e-learning has emerged as a result of the
integration of ICT in the education fields. Following the application this
technology into teaching, some pitfalls have been identified and this have led
to the Blended learning phenomenon.However the preference on this new method
has been debated quite extensively.The aim of this paper is to investigate the
advantages of blended learning over face to face instruction through reviews of
related literature.The present survey revealed that blended learning is more
favorable than pure e-learning and offers many advantages for learners like
producing a sense of community or belonging.This study concludes that blended
learning can be considered as an efficient approach of distance learning in
terms of students' learning experience student-student interaction as well as
studentinstructor interaction and is likely to emerge as the predominant
education model in the future.


title:
Interaction of a Bose-Einstein Condensate and a Superconductor via Eddy
  Currents

abstract:
  We study center-of-mass oscillations of a dipolar Bose-Einstein condensate in
the vicinity of a superconducting surface. We show that the magnetic field of
the magnetic dipoles induces eddy currents in the superconductor, which act
back on the Bose-Einstein condensate. This leads to a shift of its oscillation
frequency and to an anharmonic coupling of the Bose-Einstein condensate with
the superconductor. The anharmonicity creates a coupling to one of the
collective modes of the condensate that can be resonantly enhanced, if the
parameters of the condensate are chosen properly. This provides a new physical
mechanism to couple a Bose-Einstein condensate and a superconductor which
becomes significant for 52Cr, 168Er or 164Dy condensates in superconducting
mircotraps.


title:
The role of the Legendre transform in the study of the Floer complex of
  cotangent bundles

abstract:
  Consider a classical Hamiltonian H on the cotangent bundle T*M of a closed
orientable manifold M, and let L:TM -> R be its Legendre-dual Lagrangian. In a
previous paper we constructed an isomorphism Phi from the Morse complex of the
Lagrangian action functional which is associated to L to the Floer complex
which is determined by H. In this paper we give an explicit construction of a
homotopy inverse Psi of Phi. Contrary to other previously defined maps going in
the same direction, Psi is an isomorphism at the chain level and preserves the
action filtration. Its definition is based on counting Floer trajectories on
the negative half-cylinder which on the boundary satisfy "half" of the Hamilton
equations. Albeit not of Lagrangian type, such a boundary condition defines
Fredholm operators with good compactness properties. We also present a
heuristic argument which, independently on any Fredholm and compactness
analysis, explains why the spaces of maps which are used in the definition of
Phi and Psi are the natural ones. The Legendre transform plays a crucial role
both in our rigorous and in our heuristic arguments. We treat with some detail
the delicate issue of orientations and show that the homology of the Floer
complex is isomorphic to the singular homology of the loop space of M with a
system of local coefficients, which is defined by the pull-back of the second
Stiefel-Whitney class of TM on 2-tori in M.


title: Duality of Preenvelopes and Pure Injective Modules

abstract:
  Let $R$ be an arbitrary ring and $(-)^+=\Hom_{\mathbb{Z}}(-,
\mathbb{Q}/\mathbb{Z})$ where $\mathbb{Z}$ is the ring of integers and
$\mathbb{Q}$ is the ring of rational numbers, and let $\mathcal{C}$ be a
subcategory of left $R$-modules and $\mathcal{D}$ a subcategory of right
$R$-modules such that $X^+\in \mathcal{D}$ for any $X\in \mathcal{C}$ and all
modules in $\mathcal{C}$ are pure injective. Then a homomorphism $f: A\to C$ of
left $R$-modules with $C\in \mathcal{C}$ is a $\mathcal{C}$-(pre)envelope of
$A$ provided $f^+: C^+\to A^+$ is a $\mathcal{D}$-(pre)cover of $A^+$. Some
applications of this result are given.


title: Regularizing properties of the twisted K\"ahler-Ricci flow

abstract:
  Let $X$ be a compact K\"ahler manifold. We show that the K\"ahler-Ricci flow
(as well as its twisted versions) can be run from an arbitrary positive closed
current with zero Lelong numbers and immediately smoothes it.


title: Modeling of Multipath Transport

abstract:
  In this paper, we propose a model for evaluating the transmission performance
of multipath transport. Previous researches focused exclusively on single pair
users in simple scenarios. The distinct perspective in this paper is to build
models for analyzing the performance when multipath transport is used in the
entire network scope. We illustrate the influences on the transmission
performance caused by the variation of network topologies, the services'
arrival rate, the services' size and other parameters. We demonstrate through
simulation that multipath transport could conditionally increase the throughput
than single-path transport. And it has the capability to support higher
services' arrival rate in various network topologies. And higher multi-parent
probability will be beneficial for multipath transport to take its advantages.


title: The Dark Side of the Universe after Planck

abstract:
  Recently released Planck data implies a smaller Hubble constant $H_0$ than
that from Hubble Space Telescope project (HST) and a larger percentage of the
matter components $\Omega_m$ compared to Supernova Legacy Survey (SNLS) in
$\Lambda$CDM model. In this paper we found that even though the tension on
$H_0$ between Planck and HST can be relaxed if the dark radiation is introduced
($\Delta N_{\rm eff}=0.536_{-0.224}^{+0.229}$ at $68\%$ CL from the datasets of
Planck+WMAP Polarization (WP)+baryon acoustic oscillation (BAO)+the combination
of supernova Union2.1 compilation of 580 SNe (Union2.1)+HST), $\Omega_m$ from
Planck is still not nicely compatible with that from SNLS. The tensions between
Planck and other astrophysical datasets can be significantly relaxed in $w$CDM
model, and the combination of these datasets prefers a phantom-like dark energy
at more than $95\%$ CL: $w=-1.15\pm 0.07$ and $w=-1.16\pm 0.06$ at $68\%$ CL
from Planck+WP+BAO+Union2.1+HST and Planck+WP+BAO+SNLS+HST respectively. From
the statistical point of view, there is no evidence for a time-evolving
equation of state ($\Delta \chi^2=-0.3$ compared to a constant equation of
state for the combination of Planck+WP+BAO+SNLS+HST).


title:
Application of particle swarm optimization for enhanced cyclic steam
  stimulation in a offshore heavy oil reservoir

abstract:
  Three different variations of PSO algorithms, i.e. Canonical, Gaussian
Bare-bone and L\'evy Bare-bone PSO, are tested to optimize the ultimate oil
recovery of a large heavy oil reservoir. The performance of these algorithms
was compared in terms of convergence behaviour and the final optimization
results. It is found that, in general, all three types of PSO methods are able
to improve the objective function. The best objective function is found by
using the Canonical PSO, while the other two methods give similar results. The
Gaussian Bare-bone PSO may picks positions that are far away from the optimal
solution. The L\'evy Bare-bone PSO has similar convergence behaviour as the
Canonical PSO. For the specific optimization problem investigated in this
study, it is found that the temperature of the injection steam, CO2 composition
in the injection gas, and the gas injection rates have bigger impact on the
objective function, while steam injection rate and the liquid production rate
have less impact on the objective function.


title:
Factorizations of EP Banach space operators and EP Banach algebra
  elements

abstract:
  EP Banach space operators and EP Banach algebra elements are characterized
using different kinds of factorizations. The results obtained generalize
well-known characterizations of EP matrices, EP Hilbert space operators and EP
$C^*$-algebra elements. Furthermore, new results that hold in these contexts
are presented.


title:
Exploring Verbalization and Collaboration during Usability Evaluation
  with Children in Context

abstract:
  In this paper, we investigate the effect of context on usability evaluation.
The focus is on how children behave and perform when they are tested in
different settings. Two most commonly applied usability evaluation methods: the
think-aloud and constructive interactions are applied to the children in
different physical contexts. We present an experimental design involving 54
children participating in two different configurations of constructive
interaction and a traditional think-aloud. The behavior and performance of the
children in two different physical contexts is measured by evaluating the
results of application of think-aloud and constructive interaction. Finally, we
outline lessons on the impact of context on involving children in usability
testing.


title:
Investigation of the $B_c\rightarrow \chi_{c2} l \bar{\nu} $ transition
  via QCD sum rules

abstract:
  We calculate the transition form factors of the semileptonic $B_c\rightarrow
\chi_{c2} l \bar{\nu} $ in the framework of QCD sum rules taking into account
the two-gluon condensate corrections. Using the obtained results of form
factors we estimate the decay widths and branching ratios related to this
transition at all lepton channels. A comparison of the obtained results with
the predictions of other non-perturbative approaches are also made. The orders
of branching ratios for different lepton channels indicate that the
$B_c\rightarrow \chi_{c2} l \bar{\nu} $ transition can be studied at LHC using
the collected or future data.


title: On-board GRB trigger algorithms of SVOM-GRM

abstract:
  GRM (Gamma-Ray Monitor) is the high energy detector on-board the future
Chinese-French satellite SVOM (Space-based multi-band astronomical Variable
Object Monitor) which is dedicated to Gamma-Ray Burst (GRB) studies. This paper
presents the investigation of the on-board counting rate trigger algorithms of
GRM. The trigger threshold and trigger efficiency based on the given GRB sample
are calculated with the algorithms. The trigger characteristics of GRM and
ECLAIRs are also analyzed. In addition, the impact of solar flares on GRM is
estimated, and the method to distinguish solar flares from GRBs is
investigated.


title:
Generating mid-IR octave-spanning supercontinua and few-cycle pulses
  with solitons in phase-mismatched quadratic nonlinear crystals

abstract:
  We discuss a novel method for generating octave-spanning supercontinua and
few-cycle pulses in the important mid-IR wavelength range. The technique relies
on strongly phase-mismatched cascaded second-harmonic generation (SHG) in
mid-IR nonlinear frequency conversion crystals. Importantly we here investigate
the so-called noncritical SHG case, where no phase matching can be achieved but
as a compensation the largest quadratic nonlinearities are exploited. A
self-defocusing temporal soliton can be excited if the cascading nonlinearity
is larger than the competing material self-focusing nonlinearity, and we define
a suitable figure of merit to screen a wide range of mid-IR dielectric and
semiconductor materials with large effective second-order nonlinearities
$d_{\rm eff}$. The best candidates have simultaneously a large bandgap and a
large $d_{\rm eff}$. We show selected realistic numerical examples using one of
the promising crystals: in one case soliton pulse compression from 50 fs to 15
fs (1.5 cycles) at $3.0\mic$ is achieved, and at the same time a 3-cycle
dispersive wave at $5.0\mic$ is formed that can be isolated using a long-pass
filter. In another example we show that extremely broadband supercontinua can
form spanning the near-IR to the end of the mid-IR (nearly 4 octaves).


title:
Investigation of the semileptonic transition of the $B$ into the
  orbitally excited charmed tensor meson

abstract:
  The transition form factors of the semileptonic $B \rightarrow
D_2^*(2460)\ell\bar{\nu}\,\,\,\,(\ell=\tau,\mu,e)$ decay channel are calculated
within the framework of the three-point QCD sum rules. The fit functions of the
form factors are then used to estimate the total decay width and branching
ratio of this transition. The order of branching ratio shows that this channel
can be detected at LHCb.


title:
The confinement induced resonance in spin-orbit coupled cold atoms with
  Raman coupling

abstract:
  We investigate the confinement induced resonance in spin-orbit coupled cold
atoms with Raman coupling. We find that the quasi-bound levels induced by the
spin-orbit coupling and Raman coupling result in the Feshbach-type resonances.
For sufficiently large Raman coupling, the bound states in one dimension exist
only for sufficiently strong attractive interaction. Furthermore, the bound
states in quasi-one dimension exist only for sufficient large ratio of the
length scale of confinement to three dimensional s-wave scattering length. The
Raman coupling substantially changes the confinement-induced resonance
position. We give a proposal to realize confinement induced resonance by
increasing the Raman coupling strength in experiments.


title:
A mixed finite element method for nearly incompressible elasticity and
  Stokes equations using primal and dual meshes with quadrilateral and
  hexahedral grids

abstract:
  We consider a mixed finite element method for approximating the solution of
nearly incompressible elasticity and Stokes equations. The finite element
method is based on quadrilateral and hexahedral triangulation using primal and
dual meshes. We use the standard bilinear and trilinear finite element space
enriched with element-wise defined bubble functions with respect to the primal
mesh for the displacement or velocity, whereas the pressure space is
discretised by using a piecewise constant finite element space with respect to
the dual mesh.


title:
Insights on the local dynamics induced by thermal cycling in granular
  matter

abstract:
  In this letter, we report results on the effect of temperature variations on
a granular assembly through Molecular Dynamic simulations of a 2D granular
column. Periodic dilation of the grains are shown to perfectly mimic such
thermal cycling, and allows to rationalize the link between the compaction
process, the local grains dynamics and finite size effects. Here we show that
the individual grain properties, namely their roughness and elastic modulus
define a minimal cycling amplitude of temperature \Delta Tc below which the
dynamics is intermittent and spatially heterogeneous while confined into
localized regions recently coined "hot spot" [Amon et al., Phys. Rev. Lett.
108, 135502 (2012)]. Above \Delta Tc, the whole column flows while the grains
dynamics ranges continuously from cage-like at the bottom of the column to
purely diffusive at the top. Our results provide a solid framework for the
futur use of thermal cycling as an alternate driving method for soft glassy
materials.


title:
Ultrasensitive Detection of Majorana Fermions via Spin-based
  Optomechanics with Carbon Nanotubes

abstract:
  We propose a novel optical method to detect the existence of Majorana
fermions at the ends of the semiconductor nanowire via the coupling to an
electron spin trapped on a carbon nanotube resonator under the control of a
strong pump field and a weak probe field. The coupling strength of Majorana
fermion to the spin in the carbon nanotube and the decay rate of the Majorana
fermion can be easily measured from the probe absorption spectrum via
manipulating the spin-mechanical coupling in the suspended\ carbon nanotube.
The scheme proposed here will open a good perspective for its applications in
all-optical controlled Majorana fermion-based quantum computation and quantum
information processing.


title: Group Symmetry and non-Gaussian Covariance Estimation

abstract:
  We consider robust covariance estimation with group symmetry constraints.
Non-Gaussian covariance estimation, e.g., Tyler scatter estimator and
Multivariate Generalized Gaussian distribution methods, usually involve
non-convex minimization problems. Recently, it was shown that the underlying
principle behind their success is an extended form of convexity over the
geodesics in the manifold of positive definite matrices. A modern approach to
improve estimation accuracy is to exploit prior knowledge via additional
constraints, e.g., restricting the attention to specific classes of covariances
which adhere to prior symmetry structures. In this paper, we prove that such
group symmetry constraints are also geodesically convex and can therefore be
incorporated into various non-Gaussian covariance estimators. Practical
examples of such sets include: circulant, persymmetric and complex/quaternion
proper structures. We provide a simple numerical technique for finding maximum
likelihood estimates under such constraints, and demonstrate their performance
advantage using synthetic experiments.


title: Power moments of Kloosterman sums

abstract:
  In this paper we give an essential treatment for estimating arbitrary
integral power moments of Kloosterman sums over the residue class ring. For
prime moduli we derive explicit estimates, and for prime-power moduli we prove
concrete formulas using computations with Igusa zeta functions.


title:
Evidence for the coexistence of Dirac and massive carriers in
  a-(BEDT-TTF)2I3 under hydrostatic pressure

abstract:
  Transport measurements were performed on the organic layered compound \aI3
under hydrostatic pressure. The carrier types, densities and mobilities are
determined from the magneto-conductance of \aI3 . While evidence of
high-mobility massless Dirac carriers has already been given, we report here,
their coexistence with low-mobility massive holes. This coexistence seems
robust as it has been found up to the highest studied pressure. Our results are
in agreement with recent DFT calculations of the band structure of this system
under hydrostatic pressure. A comparison with graphene Dirac carriers has also
been done.


title:
Diffusion processes and the asymptotic bulk gap probability for the real
  Ginibre ensemble

abstract:
  It is known that the bulk scaling limit of the real eigenvalues for the real
Ginibre ensemble is equal in distribution to the rescaled $t \to \infty$ limit
of the annihilation process $A + A \to \emptyset$. Furthermore, deleting each
particle at random in the rescaled $t \to \infty$ limit of the coalescence
process $A + A \to A$, a process equal in distribution to the annihilation
process results. We use these inter-relationships to deduce from the existing
literature the asymptotic small and large distance form of the gap probability
for the real Ginibre ensemble. In particular, the leading form of the latter is
shown to be equal to $\exp(-(\zeta(3/2)/(2 \sqrt{2 \pi}))s)$, where $s$ denotes
the gap size and $\zeta(z)$ denotes the Riemann zeta function. It is shown how
this can be rigorously established using an asymptotic formula for matrix
Fredholm operators. A determinant formula is derived for the gap probability in
the finite $N$ case, and this is used to illustrate the asymptotic formulas
against numerical computations.


title: Gravity-mediated (or Composite) Dark Matter

abstract:
  Dark matter could have an electroweak origin, yet communicate with the
visible sector exclusively through gravitational interactions. In a set-up
addressing the hierarchy problem, we propose a new dark matter scenario where
gravitational mediators, arising from the compactification of extra-dimensions,
are responsible for dark matter interactions and its relic abundance in the
Universe. We write an explicit example of this mechanism in warped
extra-dimensions and work out its constraints. We also develop a dual picture
of the model, based on a four-dimensional scenario with partial compositeness.
We show that Gravity-mediated Dark Matter is equivalent to a mechanism of
generating viable dark matter scenarios in a strongly-coupled, near-conformal
theory, such as in composite Higgs models.


title: Quark mass dependence of the X(3872) binding energy

abstract:
  We explore the quark-mass dependence of the pole position of the X(3872)
state within the molecular picture. The calculations are performed within the
framework of a nonrelativistic Faddeev-type three-body equation for the
$D\bar{D}\pi$ system in the $J^{PC}=1^{++}$ channel. The $\pi D$ interaction is
parametrised via a $D^*$ pole, and a three-body force is included to render the
equations well defined. Its strength is adjusted such that the X(3872) appears
as a $D\bar{D}^*$ bound state 0.5 MeV below the neutral threshold. We find that
the trajectory of the X(3872) depends strongly on the assumed quark-mass
dependence of the short-range interactions which can be determined in future
lattice QCD calculations. At the same time we are able to provide nontrivial
information on the chiral extrapolation in the $X$ channel.


title: On the Krull dimension of rings of semialgebraic functions

abstract:
  Let $R$ be a real closed field and let ${\mathcal S}(M)$ be the ring of
(continuous) semialgebraic functions on a semialgebraic set $M\subset R^n$ and
let ${\mathcal S}^*(M)$ be its subring of bounded semialgebraic functions. In
this work we introduce the concept of \em semialgebraic depth \em of a prime
ideal $\gtp$ of ${\mathcal S}(M)$ in order to provide an elementary proof of
the finiteness of the Krull dimension of the rings ${\mathcal S}(M)$ and
${\mathcal S}^*(M)$, inspired in the classical way of doing to compute the
dimension of a ring of polynomials on a complex algebraic set and without
involving the sophisticated machinery of real spectra. We also show that
$\dim{\mathcal S}(M)=\dim{\mathcal S}^*(M)=\dim M$ and we prove that in both
cases the height of a maximal ideal corresponding to a point $p\in M$ coincides
with the local dimension of $M$ at $p$. In case $\gtp$ is a prime \em $z$-ideal
\em of ${\mathcal S}(M)$, its semialgebraic depth coincides with the
transcendence degree over $R$ of the real closed field $\qf({\mathcal
S}(M)/\gtp)$.


title: A simple configuration setup for compton suppression spectroscopy

abstract:
  The fast timing, standard timing and easy timing are popular timing
configurations of compton suppression spectroscopy. Such spectroscopes always
use a module of coincidence or time-to-amplitude converter (TAC). A compton
suppression spectroscopy with semi-timing configuration is presented in this
paper. The semi-timing configuration is relatively simple and easy system
setup, especially this spectroscopy does not need to use module of coincidence
or TAC. The performance of spectroscopy was tested and summarized. The count
rate background, full peak efficiency and the ratios of area/background of
peaks in suppressed and unsuppressed modes were comparative.


title: Counting thin subgraphs via packings faster than meet-in-the-middle time

abstract:
  Vassilevska and Williams (STOC 2009) showed how to count simple paths on $k$
vertices and matchings on $k/2$ edges in an $n$-vertex graph in time
$n^{k/2+O(1)}$. In the same year, two different algorithms with the same
runtime were given by Koutis and Williams~(ICALP 2009), and Bj\"orklund
\emph{et al.} (ESA 2009), via $n^{st/2+O(1)}$-time algorithms for counting
$t$-tuples of pairwise disjoint sets drawn from a given family of $s$-sized
subsets of an $n$-element universe. Shortly afterwards, Alon and Gutner (TALG
2010) showed that these problems have $\Omega(n^{\lfloor st/2\rfloor})$ and
$\Omega(n^{\lfloor k/2\rfloor})$ lower bounds when counting by color coding.
  Here we show that one can do better, namely, we show that the
"meet-in-the-middle" exponent $st/2$ can be beaten and give an algorithm that
counts in time $n^{0.45470382 st + O(1)}$ for $t$ a multiple of three. This
implies algorithms for counting occurrences of a fixed subgraph on $k$ vertices
and pathwidth $p\ll k$ in an $n$-vertex graph in $n^{0.45470382k+2p+O(1)}$
time, improving on the three mentioned algorithms for paths and matchings, and
circumventing the color-coding lower bound. We also give improved bounds for
counting $t$-tuples of disjoint $s$-sets for $s=2,3,4$.
  Our algorithms use fast matrix multiplication. We show an argument that this
is necessary to go below the meet-in-the-middle barrier.


title:
Energy-dependent relative charge transfer cross sections of Cs+ + Rb(5s,
  5p)

abstract:
  Magneto optical trap recoil ion momentum spectroscopy is used to measure
energy-dependent charge exchange cross sections in the Cs+ + Rb(5s, 5p) system
over a range of projectile energies from 3.2 to 6.4 keV. The measurements are
kinematically complete and yield cross sections that are differential in
collision energy, scattering angle, and initial and final states.


title:
Unlocking the Standard Model; N=1 and 2 generations of quarks :
  spectrum, mixing and symmetries

abstract:
  The Glashow-Salam-Weinberg model for N=2 generations is extended to 8
composite Higgs multiplets by using a one-to-one correspondence between its
complex Higgs doublet and very specific quadruplets of bilinear quark
operators. This is the minimal number required to suitably account,
simultaneously, for the pseudoscalar mesons that can be built with 4 quarks and
for the masses of the $W$ gauge bosons. They are used as input, together with
elementary low energy considerations, from which all other parameters, masses
and couplings can be calculated. We focus in this work on the spectrum of the 8
Higgs bosons, on the mixing angles, and on the set of "horizontal" and
"vertical" entangled symmetries that, within the chiral $U(4)_L \times U(4)_R$
group, strongly frame this extension of the Standard Model. In particular, the
$u-c$ ($\theta_u$) and $d-s$ ($\theta_d$) mixing angles satisfy the robust
relation $\tan(\theta_d+\theta_u)\tan(\theta_d-\theta_u) =
\Big(\frac{1}{m_{K^\pm}^2}-\frac{1}{m_{D^\pm}^2}\Big) \big/
\Big(\frac{1}{m_{\pi^\pm}^2}-\frac{1}{m_{D_s^\pm}^2}\Big)$. Light scalars
(below $90 MeV$) arise and the mass of (at least) one of the Higgs bosons grows
like that of the heaviest $\bar q\gamma_5 q$ bound state. $\theta_u$ cannot be
safely tuned to zero and several parameters have no reliable expansion in terms
of "small" parameters like $m_\pi$ or the mixing angles. This study does not
call for extra species of fermions. The effective couplings of scalars, which
depend on the non-trivial normalization of their kinetic terms, can be
extremely weak. For the sake of (relative) brevity, their rich content of
non-standard physics (including astrophysics), the inclusion of the 3rd
generation and the taming of quantum corrections are left for a subsequent
work.


title: Adaptive coupling induced multi-stable states in complex networks

abstract:
  Adaptive coupling, where the coupling is dynamical and depends on the
behaviour of the oscillators in a complex system, is one of the most crucial
factors to control the dynamics and streamline various processes in complex
networks. In this paper, we have demonstrated the occurrence of multi-stable
states in a system of identical phase oscillators that are dynamically coupled.
We find that the multi-stable state is comprised of a two cluster
synchronization state where the clusters are in anti-phase relationship with
each other and a desynchronization state. We also find that the phase
relationship between the oscillators is asymptotically stable irrespective of
whether there is synchronization or desynchronization in the system. The time
scale of the coupling affects the size of the clusters in the two cluster
state. We also investigate the effect of both the coupling asymmetry and
plasticity asymmetry on the multi-stable states. In the absence of coupling
asymmetry, increasing the plasticity asymmetry causes the system to go from a
two clustered state to a desynchronization state and then to a two clustered
state. Further, the coupling asymmetry, if present, also affects this
transition. We also analytically find the occurrence of the above mentioned
multi-stable-desynchronization-multi-stable state transition. A brief
discussion on the phase evolution of nonidentical oscillators is also provided.
Our analytical results are in good agreement with our numerical observations.


title:
Boundary layers, Rellich estimates and extrapolation of solvability for
  elliptic systems

abstract:
  The purpose of this article is to study extrapolation of solvability for
boundary value problems of elliptic systems in divergence form on the upper
half-space assuming De Giorgi type conditions. We develop a method allowing to
treat each boundary value problem independently of the others. We shall base
our study on solvability for energy solutions, estimates for boundary layers,
equivalence of certain boundary estimates with interior control so that
solvability reduces to a one-sided Rellich inequality. Our method then amounts
to extrapolating this Rellich inequality using atomic Hardy spaces,
interpolation and duality. In the way, we reprove the Regularity-Dirichlet
duality principle between dual systems and extend it to $H^1-BMO$. We also
exhibit and use a similar Neumann-Neumann duality principle.


title:
Broadband absorption enhancement in ultra-thin crystalline Si solar
  cells by incorporating metallic and dielectric nanostructures in the back
  reflector

abstract:
  We propose a back-reflecting scheme in order to enhance the maximum
achievable current in one micron thick crystalline silicon solar cells. We
perform 3-dimensional numerical investigations of the scattering properties of
metallic nanostructures located at the back side, and optimize them for
enhancing absorption in the silicon layer. We validate our numerical results
experimentally and also compare the absorption enhancement in the solar cell
structure, both with quasi-periodic and random metallic nanostructures. We have
looked at the interplay between the metallic nanostructures and an integrated
back-reflector. We show that the combination of metallic nanoparticles and a
metallic reflector results in significant parasitic absorption. We compared
this to another implementation based on titanium dioxide nanoparticles which
act as a lambertian reflector of light. Our simulation and experimental results
show that this proposed configuration results in reduced absorption losses and
in broadband enhancement of absorption for ultra-thin solar cells, paving the
way to an optimal back reflector for thin film photovoltaics.


title: Drake's Rule as a Consequence of Approaching Channel Capacity

abstract:
  How mutations accumulate in genomes is the central question of molecular
evolution theories, however our understanding of this process is far from
complete. Drake's rule is a notoriously universal property of genomes from
microbes to mammals - the number of (functional) mutations per-genome
per-generation is approximately constant within a phylum, despite orders of
magnitude differences in genome sizes and diverse populations properties. So
far there is no concise explanation for this phenomenon. A formal model of
storage of genetic information suggests that a genome of any species operates
near its maximum informational storage capacity, and the mutation rate is near
its upper limit, providing a simple explanation for the rule with minimal
assumptions.


title: General Hilbert stacks and Quot schemes

abstract:
  We prove the algebraicity of the Hilbert functor, the Hilbert stack, the Quot
functor and the stack of coherent sheaves on an algebraic stack X with
(quasi-)finite diagonal without any finiteness assumptions on X. We also give
similar results for Hom stacks and Weil restrictions.


title: Groupoids, Frobenius algebras and Poisson sigma models

abstract:
  In this paper we discuss some connections between groupoids and Frobenius
algebras specialized in the case of Poisson sigma models with boundary. We
prove a correspondence between groupoids in the category Set and relative
Frobenius algebras in the category Rel, as well as an adjunction between a
special type of semigroupoids and relative H*-algebras. The connection between
groupoids and Frobenius algebras is made explicit by introducing what we called
weak monoids and relational symplectic groupoids, in the context of Poisson
sigma models with boundary and in particular, describing such structures in the
ex- tended symplectic category and the category of Hilbert spaces. This is part
of a joint work with Alberto Cattaneo and Chris Heunen.


title: Magnetic-Moment Fragmentation and Monopole Crystallization

abstract:
  The Coulomb phase, with its dipolar correlations and pinch-point-scattering
patterns, is central to discussions of geometrically frustrated systems, from
water ice to binary and mixed-valence alloys, as well as numerous examples of
frustrated magnets. The emergent Coulomb phase of lattice-based systems has
been associated with divergence-free fields and the absence of long-range
order. Here, we go beyond this paradigm, demonstrating that a Coulomb phase can
emerge naturally as a persistent fluctuating background in an otherwise ordered
system. To explain this behavior, we introduce the concept of the fragmentation
of the field of magnetic moments into two parts, one giving rise to a magnetic
monopole crystal, the other a magnetic fluid with all the characteristics of an
emergent Coulomb phase. Our theory is backed up by numerical simulations, and
we discuss its importance with regard to the interpretation of a number of
experimental results.


title: The hard-core model on random graphs revisited

abstract:
  We revisit the classical hard-core model, also known as independent set and
dual to vertex cover problem, where one puts particles with a first-neighbor
hard-core repulsion on the vertices of a random graph. Although the case of
random graphs with small and very large average degrees respectively are quite
well understood, they yield qualitatively different results and our aim here is
to reconciliate these two cases. We revisit results that can be obtained using
the (heuristic) cavity method and show that it provides a closed-form
conjecture for the exact density of the densest packing on random regular
graphs with degree K>=20, and that for K>16 the nature of the phase transition
is the same as for large K. This also shows that the hard-code model is the
simplest mean-field lattice model for structural glasses and jamming.


title: Substellar multiplicity in the Hyades cluster

abstract:
  We present the first high-angular resolution survey for multiple systems
among very low-mass stars and brown dwarfs in the Hyades open cluster. Using
the Keck\,II adaptive optics system, we observed a complete sample of 16
objects with estimated masses $\lesssim$0.1 Msun. We have identified three
close binaries with projected separation $\lesssim$0.11", or $\lesssim$5 AU. A
number of wide, mostly faint candidate companions are also detected in our
images, most of which are revealed as unrelated background sources based on
astrometric and/or photometric considerations. The derived multiplicity
frequency, 19+13/-6 % over the 2-350 AU range, and the rarity of systems wider
than 10 AU are both consistent with observations of field very low-mass
objects. In the limited 3-50 AU separation range, the companion frequency is
essentially constant from brown dwarfs to solar-type stars in the Hyades
cluster, which is also in line with our current knowledge for field stars.
Combining the binaries discovered in this surveys with those already known in
the Pleiades cluster reveals that very low-mass binaries in open clusters, as
well as in star-forming regions, are skewed toward lower mass ratios ($0.6
\lesssim q \lesssim 0.8$) than are their field counterparts, a result that
cannot be accounted for by selection effects. Although the possibility of
severe systematic errors in model-based mass estimates for very low-mass stars
cannot be completely excluded, it is unlikely to explain this difference. We
speculate that this trend indicates that surveys among very low-mass field
stars may have missed a substantial population of intermediate mass ratio
systems, implying that these systems are more common and more diverse than
previously thought.


title:
Momentum Dependent Local-Ansatz with Hybrid Wavefunction from Weak to
  Strong Electron Correlations

abstract:
  The variational theory of momentum dependent local-ansatz (MLA) has been
generalized by introducing a hybrid (HB) wavefunction as a starting
wavefunction, whose potential can flexibly change from the Hartree-Fock type to
the alloy-analogy type by varying a weighting factor from zero to one.
Numerical results based on the half-filled band Hubbard model on the hypercubic
lattice in infinite dimensions show up that the new wavefunction yields the
ground-state energy lower than that of the Gutzwiller wavefunction (GW) in the
whole Coulomb interaction regime. Calculated double occupation number is
smaller than the result of the GW in the weak Coulomb interaction regime, and
remains finite in the strong regime. Furthermore, the momentum distribution
shows a distinct momentum dependence, which is qualitatively different from
that of the GW.


title: Observations of ubiquitous compressive waves in the Sun's chromosphere

abstract:
  The details of the mechanism(s) responsible for the observed heating and
dynamics of the solar atmosphere still remain a mystery. Magnetohydrodynamic
(MHD) waves are thought to play a vital role in this process. Although it has
been shown that incompressible waves are ubiquitous in off-limb solar
atmospheric observations their energy cannot be readily dissipated. We provide
here, for the first time, on-disk observation and identification of concurrent
MHD wave modes, both compressible and incompressible, in the solar
chromosphere. The observed ubiquity and estimated energy flux associated with
the detected MHD waves suggest the chromosphere is a vast reservoir of wave
energy with the potential to meet chromospheric and coronal heating
requirements. We are also able to propose an upper bound on the flux of the
observed wave energy that is able to reach the corona based on observational
constraints, which has important implications for the suggested mechanism(s)
for quiescent coronal heating.


title: The need for an early anti-neutrino run of NOvA

abstract:
  The moderately large value of $\ty$, measured recently by reactor
experiments, is very welcome news for the future neutrino experiments. In
particular, the \nova experiment, with 3 years each of $\nu$ and $\anu$ runs,
will be able to determine the mass hierarchy if one of the following two
favourable combinations is true: normal hierarchy with $-180^\circ \leq \dcp
\leq 0$ or inverted hierarchy with $0\leq \dcp \leq 180^\circ$. In this report,
we study the hierarchy reach of the first 3 years of \nova data. Since $\sin^2
2 \tz$ is measured to be non-maximal, $\tz$ can be either in the lower or
higher octant. Pure $\nu$ data is affected by $\ty$-hierarchy and
octant-hierarchy degeneracies, which limit the hierarchy sensitivity of such
data. A combination of $\nu$ and $\anu$ data is not subject to these
degeneracies and hence has much better hierarchy discrimination capability. We
find that, with a 3 year $\nu$ run, hierarchy determination is possible for
only two of the four octant-hierarchy combinations. Equal 1.5 year runs in
$\nu$ and $\anu$ modes give good hierarchy sensitivity for all the four
combinations.


title:
Alternate Definitions of Loop Corrections to the Primordial Power
  Spectra

abstract:
  We consider two different definitions for loop corrections to the primordial
power spectra. One of these is to simply correct the mode functions in the tree
order relations using the linearized effective field equations. The second
definition involves the spatial Fourier transform of the 2-point correlator.
Although the two definitions agree at tree order, we show that they disagree at
one loop using the Schwinger-Keldysh formalism, so there are at least two
plausible ways of loop correcting the tree order result. We discuss the
advantages and disadvantages of each.


title:
Some features of anomalous conductivity of vinylene and vinyl chloride
  copolymer films

abstract:
  Manifestations of anomalous conductivity in polar dielectric films is
demonstrated for the first time on samples of copolymer of vinylene and vinyl
chloride, as was previously observed on modified PVC samples. On the base of
these experimental results important new insights into the physical sense of
traditionally used in these conditions specific resistivity indicators, both
volume and surface, should be replaced by transverse and longitudinal
resistance (according to polymer film surface) respectively, because the
specific resistivity of polymer composite does not permits to calculate as
usual the resistance of sample of arbitrary form..


title: Constant Modulus Algorithms Using Hyperbolic Givens Rotation

abstract:
  We propose two new algorithms to minimize the constant modulus (CM) criterion
in the context of blind source separation. The first algorithm, referred to as
Givens CMA (G-CMA) uses unitary Givens rotations and proceeds in two stages:
prewhitening step, which reduces the channel matrix to a unitary one followed
by a separation step where the resulting unitary matrix is computed using
Givens rotations by minimizing the CM criterion. However, for small sample
sizes, the prewhitening does not make the channel matrix close enough to
unitary and hence applying Givens rotations alone does not provide satisfactory
performance. To remediate to this problem, we propose to use non-unitary Shear
(Hyperbolic) rotations in conjunction with Givens rotations. This second
algorithm referred to as Hyperbolic G-CMA (HG-CMA) is shown to outperform the
G-CMA as well as the Analytical CMA (ACMA) in terms of separation quality. The
last part of this paper is dedicated to an efficient adaptive implementation of
the HG-CMA and to performance assessment through numerical experiments.


title:
Magnetic domain growth in a ferromagnetic Bose-Einstein condensate:
  Effects of current

abstract:
  Magnetic domain patterns in a ferromagnetic Bose-Einstein condensate (BEC)
show different properties depending on the quadratic Zeeman effect and
dissipation. Another important factor that affects domain patterns and domain
growth is superfluid flow of atoms. Domain growth in a ferromagnetic BEC with
negative quadratic Zeeman energy is characterized by the same growth law as
(classical) binary fluid in the inertial hydrodynamic regime. In the absence of
the superfluid flow, the domain growth law for negative quadratic Zeeman energy
is the same as that of scalar conserved fields such as binary alloys.


title:
Localization phenomena in a DNA double helix structure : A twisted
  ladder model

abstract:
  In this work we propose a model for DNA double helix within the tight-binding
framework that incorporates the helicity of the molecules. We have studied
localization properties of three DNAsequences,the periodic poly(dG)-poly(dC)
and poly(dA)-poly(dT) sequences and the random ATGCsequence, all of which are
coupled to backbone withrandom site energies representing the
environmentalfluctuations. We observe that due to helicity of DNA, electron
transport is greatly enhancedand there exists almost a disorder-strength
independent critical value of the hopping integral, thataccounts for helicity
of DNA, for which the electronic states become maximally extended. We havealso
investigated the effect of backbone energetics on the transmission and I-V
characteristics of DNA.


title: On characterization of toric varieties

abstract:
  We study the conjecture due to V.\,V. Shokurov on characterization of toric
varieties. We also consider one generalization of this conjecture. It is shown
that none of the characterizations holds true in dimension $\ge 3$. Some weaker
versions of the conjecture(s) are verified.


title:
Coupling of a Single Quantum Emitter to End-to-end Aligned Silver
  Nanowires

abstract:
  We report on the observation of coupling a single nitrogen vacancy (NV)
center in a nanodiamond crystal to a propagating plasmonic mode of silver
nanowires. The nanocrystal is placed either near to the apex of a single silver
nanowire or in the gap between two end-to-end aligned silver nanowires. We
observe an enhancement of the NV-centers' decay rate in both cases as a result
of the coupling to the plasmons. The devices are nano-assembled with a scanning
probe technique. Through simulations, we show that end-to-end aligned silver
nanowires can be used as a controllable splitter for emission from a dipole
emitter.


title: On M2M communications standards for smart metering

abstract:
  The paper discusses M2M communications standards for smart metering. One of
the our goals is to show the failures of ETSI standartization process for M2M
communications. Our paper proposes some extesions to ETSI standards. At the
first hand, it is M-Bus protocol and Open Metering System based on M-Bus. The
paper shows how to estimate wireless M-bus throughput and how to avoid
collisions. After analysis of Open API for M2M, submitted to ETSI, we propose a
new approach in the client-side web development - Web Intents. The main goal
for our suggestions is to simplify the development phase for new applications
by support asynchronous calls and JSON versus XML for data exchange.


title: Dialogue System: A Brief Review

abstract:
  A Dialogue System is a system which interacts with human in natural language.
At present many universities are developing the dialogue system in their
regional language. This paper will discuss about dialogue system, its
components, challenges and its evaluation. This paper helps the researchers for
getting info regarding dialogues system.