title:
First principles molecular dynamics without self-consistent field
  optimization

abstract:
  We present a first principles molecular dynamics approach that is based on
time-reversible ex- tended Lagrangian Born-Oppenheimer molecular dynamics
[Phys. Rev. Lett. 100, 123004 (2008)] in the limit of vanishing self-consistent
field optimization. The optimization-free dynamics keeps the computational cost
to a minimum and typically provides molecular trajectories that closely follow
the exact Born-Oppenheimer potential energy surface. Only one single
diagonalization and Hamiltonian (or Fockian) costruction are required in each
integration time step. The proposed dy- namics is derived for a general
free-energy potential surface valid at finite electronic temperatures within
hybrid density functional theory. Even in the event of irregular functional
behavior that may cause a dynamical instability, the optimization-free limit
represents an ideal starting guess for force calculations that may require a
more elaborate iterative electronic ground state optimization. Our
optimization-free dynamics thus represents a flexible theoretical framework for
a broad and general class of ab initio molecular dynamics simulations.


title:
Theoretical investigation of thermodynamic balance between cluster
  isomers and statistical model for predicting isomerization rate

abstract:
  By molecular dynamics simulations and free energy calculations based on Monte
Carlo method, the detailed balance between Pt cluster isomers was investigated.
For clusters of n<=50, stationary equilibrium is achieved in 100 ns in the
canonical ensemble, while longer time is needed for n>50. Then, a statistical
mechanical model was built to evaluate unimolecular isomerization rate and
simplify the prediction of isomer formation probability. This model is simpler
than transition state theory and can be easily applied on ab initio
calculations to predict the lifetime of nanostructures.


title:
Proton decay in a supersymmetric SO(10) model with missing partner
  mechanism

abstract:
  The extended supersymmetric SO(10) model with missing partner mechanism is
studied. An intermediate vacuum expectation value is incorporated which
corresponds to the see-saw scale. Gauge coupling unification is not broken
explicitly. Proton decay is found to satisfy the present experimental limits at
the cost of fine-tuning some parameters.


title: On numerical equivalence for algebraic cobordism

abstract:
  We define and study the notion of numerical equivalence on algebraic
cobordism cycles. We prove that algebraic cobordism modulo numerical
equivalence is a finitely generated module over the Lazard ring, and it
reproduces the Chow group modulo numerical equivalence. We show this theory
defines an oriented Borel-Moore homology theory on schemes and oriented
cohomology theory on smooth varieties.
  We compare it with homological equivalence and smash-equivalence for
cobordism cycles. For the former, we show that homological equivalence on
algebraic cobordism is strictly finer than numerical equivalence, answering
negatively the integral cobordism analogue of the standard conjecture $(D)$.
For the latter, using Kimura finiteness on cobordism motives, we partially
resolve the cobordism analogue of a conjecture by Voevodsky on rational
smash-equivalence and numerical equivalence.


title:
Imaging the Moon II: Webcam CCD observations & analysis (a two week lab
  for non-majors)

abstract:
  Presented is a successful two week lab involving real sky observations of the
Moon in which students make telescopic observations and analyze their own
images. Originally developed around the 35 mm film camera as a common household
object adapted for astronomical work, the lab transitioned to use the webcam as
film photography evolved into an obscure specialty technology and increasing
numbers of students had little familiarity with it. The printed circuit board
with the CCD is harvested from a retail webcam and affixed to a tube to mount
on a telescope in place of an eyepiece. Image frames are compiled to form a
lunar mosaic and crater sizes are measured. Students also work through the
logistical steps of telescope time assignment and scheduling, keeping to
schedule and working with uncertainties of weather, in ways paralleling
research observations. Because there is no need for a campus observatory, this
lab can be replicated at a wide variety of institutions.


title:
Up to 700k GPU cores, Kepler, and the Exascale future for simulations of
  star clusters around black holes

abstract:
  We present direct astrophysical N-body simulations with up to a few million
bodies using our parallel MPI/CUDA code on large GPU clusters in China, Ukraine
and Germany, with different kinds of GPU hardware. These clusters are directly
linked under the Chinese Academy of Sciences special GPU cluster program in the
cooperation of ICCS (International Center for Computational Science). We reach
about the half the peak Kepler K20 GPU performance for our phi-GPU code [2], in
a real application scenario with individual hierarchically block time-steps
with the high (4th, 6th and 8th) order Hermite integration schemes and a real
core-halo density structure of the modeled stellar systems. The code and
hardware are mainly used to simulate star clusters [23, 24] and galactic nuclei
with supermassive black holes [20], in which correlations between distant
particles cannot be neglected.


title:
Casimir Effect under Quasi-Periodic Boundary Condition Inspired by
  Nanotubes

abstract:
  When one studies the Casimir effect, the periodic (anti-periodic) boundary
condition is usually taken to mimic a periodic (anti-periodic) structure for a
scalar field living in a flat space with a non-Euclidean topology. However,
there could be an arbitrary phase difference between the value of the scalar
field on one endpoint of the unit structure and that on the other endpoint,
such as the structure of nanotubes. Then, in this paper, a periodic condition
on the ends of the system with an additional phase factor, which is called the
``quasi-periodic" condition, is imposed to investigate the corresponding
Casimir effect. And an attractive or repulsive Casimir force is found, whose
properties depend on the phase angle value. Especially, the Casimir effect
disappears when the phase angle takes a particular value. High dimensional
space-time case is also investigated.


title: Topological T-duality for Stacks using a Gysin Sequence

abstract:
  In this paper we study the topological T-dual of spaces with a non-free
circle action mainly using the stack theory method of Bunke and co-workers
\cite{Bunke1}. We first compare three formalisms for obtaining the Topological
T-dual of a semi-free $S^1$-space in a simple example. Then, we calculate the
T-dual of general KK-monopole backgrounds using the stack theory method. We
define the dyonic coordinate for these backgrounds. We introduce an approach to
Topological T-duality using classifying spaces which simultaneously generalizes
the methods of Bunke et al \cite{Bunke1} and Mathai and Wu \cite{MaWu}. Then,
we define a cohomology Gysin sequence for prinicpal bundles of stacks and
describe an application to Topological T-duality for stacks. We apply the above
to calculate the Topological T-dual of a general compact three-manifold with an
{\em arbitrary} smooth circle action. We point out a possible application of
these T-duals to higher-dimensional black holes.


title:
Stellar Diameters and Temperatures V. Eleven Newly Characterized
  Exoplanet Host Stars

abstract:
  We use near-infrared interferometric data coupled with trigonometric parallax
values and spectral energy distribution fitting to directly determine stellar
radii, effective temperatures, and luminosities for the exoplanet host stars 61
Vir, $\rho$ CrB, GJ 176, GJ 614, GJ 649, GJ 876, HD 1461, HD 7924, HD 33564, HD
107383, and HD 210702. Three of these targets are M dwarfs. Statistical
uncertainties in the stellar radii and effective temperatures range from 0.5%
-- 5% and from 0.2% -- 2%, respectively. For eight of these targets, this work
presents the first directly determined values of radius and temperature; for
the other three, we provide updates to their properties. The stellar
fundamental parameters are used to estimate stellar mass and calculate the
location and extent of each system's circumstellar habitable zone. Two of these
systems have planets that spend at least parts of their respective orbits in
the system habitable zone: two of GJ 876's four planets and the planet that
orbits HD 33564. We find that our value for GJ 876's stellar radius is more
than 20% larger than previous estimates and frequently used values in the
astronomical literature.


title: "Nice" Rational Functions

abstract:
  We consider simple rational functions $R_{mn}(x)=P_m(x)/Q_n(x)$, with $P_m$
and $Q_n$ polynomials of degree $m$ and $n$ respectively. We look for "nice"
functions, which we define to be ones where as many as possible of the roots,
poles, critical points and (possibly) points of inflexion are integer or, at
worst, rational.


title: Statistical Modelling of Citation Exchange Between Statistics Journals

abstract:
  Rankings of scholarly journals based on citation data are often met with
skepticism by the scientific community. Part of the skepticism is due to
disparity between the common perception of journals' prestige and their ranking
based on citation counts. A more serious concern is the inappropriate use of
journal rankings to evaluate the scientific influence of authors. This paper
focuses on analysis of the table of cross-citations among a selection of
Statistics journals. Data are collected from the Web of Science database
published by Thomson Reuters. Our results suggest that modelling the exchange
of citations between journals is useful to highlight the most prestigious
journals, but also that journal citation data are characterized by considerable
heterogeneity, which needs to be properly summarized. Inferential conclusions
require care in order to avoid potential over-interpretation of insignificant
differences between journal ratings. Comparison with published ratings of
institutions from the UK's Research Assessment Exercise shows strong
correlation at aggregate level between assessed research quality and journal
citation `export scores' within the discipline of Statistics.


title:
Modeling association between DNA copy number and gene expression with
  constrained piecewise linear regression splines

abstract:
  DNA copy number and mRNA expression are widely used data types in cancer
studies, which combined provide more insight than separately. Whereas in
existing literature the form of the relationship between these two types of
markers is fixed a priori, in this paper we model their association. We employ
piecewise linear regression splines (PLRS), which combine good interpretation
with sufficient flexibility to identify any plausible type of relationship. The
specification of the model leads to estimation and model selection in a
constrained, nonstandard setting. We provide methodology for testing the effect
of DNA on mRNA and choosing the appropriate model. Furthermore, we present a
novel approach to obtain reliable confidence bands for constrained PLRS, which
incorporates model uncertainty. The procedures are applied to colorectal and
breast cancer data. Common assumptions are found to be potentially misleading
for biologically relevant genes. More flexible models may bring more insight in
the interaction between the two markers.


title:
Discussions on the crossover property within the Nambu--Jona-Lasinio
  model

abstract:
  In this paper, chiral symmetry breaking and its restoration are investigated
in the mean field approximation of Nambu--Jona-Lasinio model. A first-order
phase transition exists at low temperature, but is smeared out at high
temperature. We discuss the rationality of using susceptibilities as the
criteria to determine the crossover region as well as the critical point. Based
on our results, it is found that to define a critical band instead of an
exclusive line in this region might be a more suitable choice.


title: The number of killings in southern rural Norway, 1300-1569

abstract:
  Three dual systems estimates are employed to study the number of killings in
southern rural Norway in a period of slightly over 250 years. The first system
is a set of five letters sent to each killer as part of the legal process. The
second system is the mention of killings from all other contemporary sources.
The posterior distributions derived suggest fewer such killings than rough
demographic estimates.


title:
Utilitarian Opacity Model for Aggregate Particles in Protoplanetary
  Nebulae and Exoplanet Atmospheres

abstract:
  As small solid grains grow into larger ones in protoplanetary nebulae, or in
the cloudy atmospheres of exoplanets, they generally form porous aggregates
rather than solid spheres. A number of previous studies have used highly
sophisticated schemes to calculate opacity models for irregular, porous
particles with size much smaller than a wavelength. However, mere growth itself
can affect the opacity of the medium in far more significant ways than the
detailed compositional and/or structural differences between grain constituents
once aggregate particle sizes exceed the relevant wavelengths. This physics is
not new; our goal here is to provide a model that provides physical insight and
is simple to use in the increasing number of protoplanetary nebula evolution,
and exoplanet atmosphere, models appearing in recent years, yet quantitatively
captures the main radiative properties of mixtures of particles of arbitrary
size, porosity, and composition. The model is a simple combination of effective
medium theory with small-particle closed-form expressions, combined with
suitably chosen transitions to geometric optics behavior. Calculations of
wavelength-dependent emission and Rosseland mean opacity are shown and compared
with Mie theory. The model's fidelity is very good in all comparisons we have
made, except in cases involving pure metal particles or monochromatic opacities
for solid particles with size comparable to the wavelength.


title: Space-Time Polar Coded Modulation

abstract:
  The polar codes are proven to be capacity-achieving and are shown to have
equivalent or even better finite-length performance than the turbo/LDPC codes
under some improved decoding algorithms over the additive white Gaussian noise
(AWGN) channels. Polar coding is based on the so-called channel polarization
phenomenon induced by a transform over the underlying binary-input channel. The
channel polarization is found to be universal in many signal processing
problems and has been applied to the coded modulation schemes. In this paper,
the channel polarization is further extended to the multiple antenna
transmission following a multilevel coding principle. The multiple-input
multile-output (MIMO) channel under quadrature amplitude modulation (QAM) are
transformed into a series of synthesized binary-input channels under a
three-stage channel transform. Based on this generalized channel polarization,
the proposed space-time polar coded modulation (STPCM) scheme allows a joint
optimization of the binary polar coding, modulation and MIMO transmission. In
addition, a practical solution of polar code construction over the fading
channels is also provided, where the fading channels are approximated by an
AWGN channel which shares the same capacity with the original. The simulations
over the MIMO channel with uncorrelated Rayleigh fast fading show that the
proposed STPCM scheme can outperform the bit-interleaved turbo coded scheme in
all the simulated cases, where the latter is adopted in many existing
communication systems.


title:
Dynamic synchrotron X-ray imaging study of effective temperature in a
  vibrated granular medium

abstract:
  We present a dynamic synchrotron X-ray imaging study of the effective
temperature $T_{eff}$ in a vibrated granular medium. By tracking the directed
motion and the fluctuation dynamics of the tracers inside, we obtained
$T_{eff}$ of the system using Einstein relation. We found that as the system
unjams with increasing vibration intensities $\Gamma$, the structural
relaxation time $\tau$ increases substantially which can be fitted by an
Arrhenius law using $T_{eff}$. And the characteristic energy scale of
structural relaxation yielded by the Arrhenius fitting is $E = 0.21 \pm 0.02$
$pd^3$, where $p$ is the pressure and $d$ is the background particle diameter,
which is consistent with those from hard sphere simulations in which the
structural relaxation happens via the opening up of free volume against
pressure.


title: Visualizing genetic constraints

abstract:
  Principal Components Analysis (PCA) is a common way to study the sources of
variation in a high-dimensional data set. Typically, the leading principal
components are used to understand the variation in the data or to reduce the
dimension of the data for subsequent analysis. The remaining principal
components are ignored since they explain little of the variation in the data.
However, evolutionary biologists gain important insights from these low
variation directions. Specifically, they are interested in directions of low
genetic variability that are biologically interpretable. These directions are
called genetic constraints and indicate directions in which a trait cannot
evolve through selection. Here, we propose studying the subspace spanned by low
variance principal components by determining vectors in this subspace that are
simplest. Our method and accompanying graphical displays enhance the
biologist's ability to visualize the subspace and identify interpretable
directions of low genetic variability that align with simple directions.


title:
Gaugino physics of split supersymmetry spectrum at the LHC and future
  proton colliders

abstract:
  Discovery of the Higgs boson and lack of discovery of superpartners in the
first run at LHC are both predictions of split supersymmetry with thermal dark
matter. We discuss what it would take to find gluinos at hadron supercolliders,
including the LHC at 14 TeV center of mass energy, and future pp colliders at
100 TeV and 200 TeV. We generalize the discussion by re-expressing the search
capacity in terms of gluino to lightest superpartner mass ratio, and apply
results to other scenarios, such as gauge mediation and mirage mediation.


title:
Influence of the electron density on the thickness-dependent energy gap
  oscillations in superconducting metallic nanofilms

abstract:
  The thickness-dependent energy gap oscillations in the metallic nanofilms are
investigated by the use of the self-consistent numerical solutions of the
Bogoliubov-de Gennes equations. It is shown, that the oscillations are induced
by the quasi-particle energy quantization triggered by the confinement of
electrons in the direction perpendicular to the sample. We have analyzed, how
the changes in the electron density of states ($n_e$) and the electron-phonon
coupling constant ($g$) influence the amplitude of the considered oscillations.
It has been found, that the increase in $n_e$ and the decrease in $g$, can lead
to a significant reduction of the oscillations amplitude. As a result, for the
values of the mentioned parameters corresponding to some of the realistic
situations the thickness-dependent superconducting gap oscillations can be
almost completely suppressed.


title: Vacuum structure in 3d supersymmetric gauge theories

abstract:
  Based on a talk given at the Pomeranchuk memorial conference at ITEP in June
2013, we review the vacuum dynamics in 3d supersymmetric
Yang-Mills-Chern-Simons theories with and without extra matter multiplets. By
analyzing the effective Born-Oppenheimer Hamiltonian in a small spatial box, we
calculate the number of vacuum states (Witten index) and examine their
structure for these theories. The results are identical to those obtained by
other methods.


title:
Plasduino: an inexpensive, general purpose data acquisition framework
  for educational experiments

abstract:
  Based on the Arduino development platform, Plasduino is an open-source data
acquisition framework specifically designed for educational physics
experiments. The source code, schematics and documentation are in the public
domain under a GPL license and the system, streamlined for low cost and ease of
use, can be replicated on the scale of a typical didactic lab with minimal
effort. We describe the basic architecture of the system and illustrate its
potential with some real-life examples.


title: Approximation in $AC(\sigma)$

abstract:
  In order to extend the theory of well-bounded operators to include operators
with nonreal spectrum, Ashton and Doust introduced definitions for two new
algebras of functions defined on a nonempty compact subset $\sigma$ of the
plane. These are the functions of bounded variation and the absolutely
continuous functions on $\sigma$. Proofs involving absolutely continuous
functions usually require that one first works with elements of a dense subset
and then take limits. In this paper we present some new theorems about
approximating absolutely continuous functions as well as providing missing
proofs for some important earlier results.


title:
Magnetic Field Effect on Electron Spin Dynamics in (110) GaAs Quantum
  wells

abstract:
  We study the electron spin relaxation in both symmetric and asymmetric
GaAs/AlGaAs quantum wells (QWs) grown on (110) substrates in an external
magnetic field B applied along the QW normal. The spin polarization is induced
by circularly polarized light and detected by time-resolved Kerr rotation
technique. In the asymmetric structure, where a {\delta}-doped layer on one
side of the QW produces the Rashba contribution to the conduction-band
spin-orbit splitting, the lifetime of electron spins aligned along the growth
axis exhibits an anomalous dependence on B in the range 0<B<0.5 T; this results
from the interplay between the Dresselhaus and Rashba effective fields which
are perpendicular to each other. For larger magnetic fields, the spin lifetime
increases, which is the consequence of the cyclotron motion of the electrons
and is also observed in (001)-grown quantum wells. The experimental results are
in agreement with the calculation of the spin lifetimes in (110)- grown
asymmetric quantum wells described by the point group Cs where the growth
direction is not the principal axis of the spin-relaxation-rate tensor.


title: Spin structures on almost-flat manifolds

abstract:
  We give a necessary and suffcient condition for almost-flat manifolds with
cyclic holonomy to admit a Spin structure. Using this condition we find all
4-dimensional orientable almost- flat manifolds with cyclic holonomy that do
not admit a Spin structure.


title: Hierarchical Bayesian analysis of somatic mutation data in cancer

abstract:
  Identifying genes underlying cancer development is critical to cancer biology
and has important implications across prevention, diagnosis and treatment.
Cancer sequencing studies aim at discovering genes with high frequencies of
somatic mutations in specific types of cancer, as these genes are potential
driving factors (drivers) for cancer development. We introduce a hierarchical
Bayesian methodology to estimate gene-specific mutation rates and driver
probabilities from somatic mutation data and to shed light on the overall
proportion of drivers among sequenced genes. Our methodology applies to
different experimental designs used in practice, including one-stage, two-stage
and candidate gene designs. Also, sample sizes are typically small relative to
the rarity of individual mutations. Via a shrinkage method borrowing strength
from the whole genome in assessing individual genes, we reinforce inference and
address the selection effects induced by multistage designs. Our simulation
studies show that the posterior driver probabilities provide a nearly unbiased
false discovery rate estimate. We apply our methods to pancreatic and breast
cancer data, contrast our results to previous estimates and provide estimated
proportions of drivers for these two types of cancer.


title: File System - A Component of Operating System

abstract:
  The file system provides the mechanism for online storage and access to file
contents, including data and programs. This paper covers the high-level details
of file systems, as well as related topics such as the disk cache, the file
system interface to the kernel, and the user-level APIs that use the features
of the file system. It will give you a thorough understanding of how a file
system works in general. The main component of the operating system is the file
system. It is used to create, manipulate, store, and retrieve data. At the
highest level, a file system is a way to manage information on a secondary
storage medium. There are so many layers under and above the file system. All
the layers are to be fully described here. This paper will give the explanatory
knowledge of the file system designers and the researchers in the area. The
complete path from the user process to secondary storage device is to be
mentioned. File system is the area where the researchers are doing lot of job
and there is always a need to do more work. The work is going on for the
efficient, secure, energy saving techniques for the file systems. As we know
that the hardware is going to be fast in performance and low-priced day by day.
The software is not built to comeback with the hardware technology. So there is
a need to do research in this area to bridge the technology gap.


title: Filtrations of free groups as intersections

abstract:
  For several natural filtrations of a free group S we express the n-th term of
the filtration as the intersection of all kernels of homomorphisms from S to
certain groups of upper-triangular unipotent matrices. This generalizes a
classical result of Grun for the lower central filtration. In particular, we do
this for the n-th term in the lower p-central filtration of S.


title:
Long multiplication by instruction sequences with backward jump
  instructions

abstract:
  For each function on bit strings, its restriction to bit strings of any given
length can be computed by a finite instruction sequence that contains only
instructions to set and get the content of Boolean registers, forward jump
instructions, and a termination instruction. Backward jump instructions are not
necessary for this, but instruction sequences can be significantly shorter with
them. We take the function on bit strings that models the multiplication of
natural numbers on their representation in the binary number system to
demonstrate this by means of a concrete example. The example is reason to
discuss points concerning the halting problem and the concept of an algorithm.


title: Jet Production Measurements at CMS

abstract:
  Jet production cross-section measurements are presented. The measurements are
done with the data from Large Hadron Collider (LHC) proton-proton collisions,
collected with the Compact Muon Solenoid (CMS) detector. The inclusive jet
production measurements are carried out with data collected $\rm \sqrt{s} ~= ~7
~TeV$ and $\rm 8~TeV$ with total integrated luminosity ($\mathcal{L}_{int}$)
$\rm 5.0~ fb^{-1}$ and $\rm 10.71~ fb^{-1}$ respectively. The dijet production
measurements are carried out with the $\rm \sqrt{s}~ =~ 7 ~TeV$ dataset. Jets
are reconstructed with the anti-$k_T$ clustering algorithm with size parameter
$R=0.7$. The measured cross sections are corrected for detector effects and
compared to perturbative QCD predictions at NLO, corrected for NP factors,
using various sets of PDF. The inclusive jet cross-section ratio of the jets
reconstructed with the anti-$k_T$ (AK) algorithm and two radius parameter $\rm
R~=~0.5$ and $\rm R~=~0.7$ are also presented. The data used is $\rm \sqrt{s}~
=~ 7 ~TeV$ CMS data corresponding to $\rm \mathcal{L}_{int}~=~5.0 ~fb^{-1}$.
Significant discrepancies are found comparing the data to leading order
calculations and to fixed order calculations at NLO, corrected for NP effects,
whereas simulations with NLO matrix elements matched to the parton showers
describe the data quite well. A study of color coherence effects in pp
collisions has been performed with the data collected at $\rm \sqrt{s}~ =~
7~TeV$ and $\rm\mathcal{L}_{int}~=~ 36~pb^{-1}$. The measurement of the
azimuthal angular correlation between the second and third jets is compared to
the predictions of Monte Carlo models with different implementations of color
coherence effects.


title: Generalized Subdifferentials of the Sign Change Counting Function

abstract:
  The counting function on binary values is extended to the signed case in
order to count the number of transitions between contiguous locations. A
generalized subdifferential for the sign change counting function is given
where classical subdifferentials remain intractable. An attempt to prove global
optimality at some point, for the 4-dimensional first non trivial example, is
made by using a sufficient condition specially tailored among all the cases for
this subdifferential.


title:
Thoughts on entropic gravity in the Parikh-Wilczek tunneling model of
  Hawking radiation

abstract:
  In this letter, we use the Parikh-Wilczek tunneling model of Hawking
radiation to illustrate that a reformulation of Verlinde's entropic gravity is
needed to derive the Newton's law for a temperature-varying screen, demanded by
the conservation of energy. Furthermore, the entropy stored in the holographic
screen is shown to be additive and its temperature dependence can be obtained.


title: Extreme value analysis for evaluating ozone control strategies

abstract:
  Tropospheric ozone is one of six criteria pollutants regulated by the US EPA,
and has been linked to respiratory and cardiovascular endpoints and adverse
effects on vegetation and ecosystems. Regional photochemical models have been
developed to study the impacts of emission reductions on ozone levels. The
standard approach is to run the deterministic model under new emission levels
and attribute the change in ozone concentration to the emission control
strategy. However, running the deterministic model requires substantial
computing time, and this approach does not provide a measure of uncertainty for
the change in ozone levels. Recently, a reduced form model (RFM) has been
proposed to approximate the complex model as a simple function of a few
relevant inputs. In this paper, we develop a new statistical approach to make
full use of the RFM to study the effects of various control strategies on the
probability and magnitude of extreme ozone events. We fuse the model output
with monitoring data to calibrate the RFM by modeling the conditional
distribution of monitoring data given the RFM using a combination of flexible
semiparametric quantile regression for the center of the distribution where
data are abundant and a parametric extreme value distribution for the tail
where data are sparse. Selected parameters in the conditional distribution are
allowed to vary by the RFM value and the spatial location. Also, due to the
simplicity of the RFM, we are able to embed the RFM in our Bayesian
hierarchical framework to obtain a full posterior for the model input
parameters, and propagate this uncertainty to the estimation of the effects of
the control strategies. We use the new framework to evaluate three potential
control strategies, and find that reducing mobile-source emissions has a larger
impact than reducing point-source emissions or a combination of several
emission sources.


title:
Java File Security System (JFSS) Evaluation Using Software Engineering
  Approaches

abstract:
  A Java File Security System (JFSS) [1] has been developed by us. That is an
ecrypted file system. It is developed by us because there are so many file data
breaches in the past and current history and they are going to increase day by
day as the reports by DataLossDB (Open Security Foundation) organization, a
non-profit organization in US so it is. The JFSS is evaluated regarding the two
software engineering approaches. One of them is size metric that is Lines of
Code (LOC) in the software product development. Another approach is the
customer oriented namely User Satisfaction Testing methodology. Satisfying our
customers is an essential element to stay in business in modern world of global
competition. We must satisfy and even delight our customers with the value of
our software products and services to gain their loyalty and repeat business.
Customer satisfaction is therefore a primary goal of process improvement
programs as well as quality predictions of our software. With the help of User
Satisfaction Index that is calculated for many parameters regarding the
customer satisfaction. Customer Satisfaction Surveys are the best way to find
the satisfaction level of our product quality.


title:
Sparse latent factor models with interactions: Analysis of gene
  expression data

abstract:
  Sparse latent multi-factor models have been used in many exploratory and
predictive problems with high-dimensional multivariate observations. Because of
concerns with identifiability, the latent factors are almost always assumed to
be linearly related to measured feature variables. Here we explore the analysis
of multi-factor models with different structures of interactions between latent
factors, including multiplicative effects as well as a more general framework
for nonlinear interactions introduced via the Gaussian Process. We utilize
sparsity priors to test whether the factors and interaction terms have
significant effect. The performance of the models is evaluated through
simulated and real data applications in genomics. Variation in the number of
copies of regions of the genome is a well-known and important feature of most
cancers. We examine interactions between factors directly associated with
different chromosomal regions detected with copy number alteration in breast
cancer data. In this context, significant interaction effects for specific
genes suggest synergies between duplications and deletions in different regions
of the chromosome.


title:
Exponential lower bounds on the size of approximate formulations in the
  natural encoding for Capacitated Facility Location

abstract:
  The metric capacitated facility location is a well-studied problem for which,
while constant factor approximations are known, no efficient relaxation with
constant integrality gap is known. The question whether there is such a
relaxation is among the most important open problems of approximation
algorithms \cite{ShmoysWbook}.
  In this paper we show that, if one is restricted to linear programs that use
the natural encoding for facility location, at least an exponential number of
constraints is needed to achieve a constant gap. Our proof does not assume any
special property of the relaxation such as locality or symmetry.


title: Differential inclusions and Young measures involving prescribed Jacobian

abstract:
  This work presents a general principle, in the spirit of convex integration,
leading to a method for the characterization of Young measures generated by
gradients of maps in $W^{1,p}$ with $p$ less than the space dimension, whose
Jacobian determinant is subjected to a range of constraints. Two special cases
are particularly important in the theories of elasticity and fluid dynamics:
(a) the generating gradients have positive Jacobians that are uniformly bounded
away from zero and (b) the underlying deformations are incompressible,
corresponding to their Jacobian determinants being constantly one. This
characterization result, along with its various corollaries, underlines the
flexibility of the Jacobian determinant in subcritical Sobolev spaces and gives
a more systematic and general perspective on previously known pathologies of
the pointwise Jacobian. Finally, we show that, for $p$ less than the dimension,
$W^{1,p}$-quasiconvexity and $W^{1,p}$-orientation-preserving quasiconvexity
are both unsuitable convexity conditions for nonlinear elasticity where the
energy is assumed to blow up as the Jacobian approaches zero.


title: Towards sub-microarcsecond models for relativistic astrometry

abstract:
  Astrometric space missions like Gaia have stimulated a rapid advance in the
field of relativistic astrometry. Present investigations in that field aim at
accuracies significantly less than a microarcsecond. We review the present
status of relativistic astrometry. As far as the problem of light propagation
is concerned we face two problems: the form of the BCRS metric and solutions to
the light-ray equation. Finally, work in progress in that field is briefly
mentioned.


title:
Towards the Framework of the File Systems Performance Evaluation
  Techniques and the Taxonomy of Replay Traces

abstract:
  This is the era of High Performance Computing (HPC). There is a great demand
of the best performance evaluation techniques for the file and storage systems.
The task of evaluation is both necessary and hard. It gives in depth analysis
of the target system and that becomes the decision points for the users. That
is also helpful for the inventors or developers to find out the bottleneck in
their systems. In this paper many performance evaluation techniques are
described for file and storage system evaluation and the main stress is given
on the important one that is replay traces. A survey has been done for the
performance evaluation techniques used by the researchers and on the replay
traces. And the taxonomy of the replay traces is described. The some of the
popular replay traces are just like, Tracefs [1], //Trace [2], Replayfs [3] and
VFS Interceptor [12]. At last we have concluded all the features that must be
considered when we are going to develop the new tool for the replay traces. The
complete work of this paper shows that the storage system developers must care
about all the techniques which can be used for the performance evaluation of
the file systems. So they can develop highly efficient future file and storage
systems.


title:
The nature of the Island and Banana States in Atoll sources and a
  Unified Model for Low Mass X-ray Binaries

abstract:
  We propose an explanation of the Island and Banana states and the relation
between Atoll and Z-track sources, constituting a unified model for Low Mass
X-ray Binaries (LMXB). We find a dramatic transition at a luminosity of 1 -
2.10^{37} erg/s above which the high energy cut-off E_CO of the Comptonized
emission in all sources is low at a few keV. There is thermal equilibrium
between the neutron star at ~2 keV and the Comptonizing accretion disk corona
(ADC) causing the low E_CO in the Banana state of Atolls and all states of the
Z-track sources. Below this luminosity, E_CO increases towards 100 keV causing
the hardness of the island state. Thermal equilibrium is lost, the ADC becoming
much hotter than the neutron star via an additional coronal heating mechanism.
This suggests a unified model of LMXB: the Banana state is a basic state with
the mass accretion rate Mdot increasing, corresponding to the Normal Branch of
Z-track sources. The Island state has high ADC temperature, this state not
existing in the Z-track sources with luminosities much greater than the
critical value. The Z-track sources have an additional flaring branch
consistent with unstable nuclear burning on the neutron star at high Mdot. This
burning regime does not exist at low Mdot so this branch is not seen in Atolls
(except GX Atolls). The Horizontal Branch in Z-track sources has a strong
increase in radiation pressure disrupting the inner disk and launching
relativistic jets.


title:
Introduction to computer animation and its possible educational
  applications

abstract:
  Animation, which is basically a form of pictorial presentation, has become
the most prominent feature of technology-based learning environments. It refers
to simulated motion pictures showing movement of drawn objects. Recently,
educational computer animation has turned out to be one of the most elegant
tools for presenting multimedia materials for learners, and its significance in
helping to understand and remember information has greatly increased since the
advent of powerful graphics-oriented computers. In this book chapter we
introduce and discuss the history of computer animation, its well-known
fundamental principles and some educational applications. It is however still
debatable if truly educational computer animations help in learning, as the
research on whether animation aids learners' understanding of dynamic phenomena
has come up with positive, negative and neutral results. We have tried to
provide as much detailed information on computer animation as we could, and we
hope that this book chapter will be useful for students who study computer
science, computer-assisted education or some other courses connected with
contemporary education, as well as researchers who conduct their research in
the field of computer animation.


title: Cosmographic Constraints and Cosmic Fluids

abstract:
  The problem of reproducing dark energy effects is reviewed here with
particular interest devoted to cosmography. We summarize some of the most
relevant cosmological models, based on the assumption that the corresponding
barotropic equations of state evolve as the universe expands, giving rise to
the accelerated expansion. We describe in detail the $\Lambda$CDM
($\Lambda$-Cold Dark Matter) and $\omega$CDM models, considering also some
specific examples, e.g., Chevallier-Polarsky-Linder, the Chaplygin gas and the
Dvali-Gabadadze-Porrati cosmological model. Finally, we consider the
cosmological consequences of $f(\mathcal{R})$ and $f(\mathcal{T})$ gravities
and their impact on the framework of cosmography. Keeping these considerations
in mind, we point out the \emph{model-independent} procedure related to
cosmography, showing how to match the series of cosmological observables to the
free parameters of each model. We critically discuss the role played by
cosmography, as a \emph{selection criterion} to check whether a particular
model passes or does not present cosmological constraints. In so doing, we find
out cosmological bounds by fitting the luminosity distance expansion of the
redshift, z, adopting the recent Union 2.1 dataset of supernovae, combined with
the baryonic acoustic oscillation and the cosmic microwave background
measurements. We perform cosmographic analyses, imposing different priors on
the Hubble rate present value. In addition, we compare our results with recent
PLANCK limits, showing that the $\Lambda$CDM and $\omega$CDM models seem to be
the favorite with respect to other dark energy models. However, we show that
cosmographic constraints on $f(\mathcal{R})$ and $f(\mathcal{T})$ cannot
discriminate between extensions of General Relativity and dark energy models,
leading to a disadvantageous degeneracy problem.


title: Hitting-sets for low-distance multilinear depth-3

abstract:
  The depth-$3$ model has recently gained much importance, as it has become a
stepping-stone to understanding general arithmetic circuits. Its restriction to
multilinearity has known exponential lower bounds but no nontrivial blackbox
identity tests. In this paper we take a step towards designing such
hitting-sets. We define a notion of distance for multilinear depth-$3$ circuits
(say, in $n$ variables and $k$ product gates) that measures how far are the
partitions from a mere refinement. The $1$-distance strictly subsumes the
set-multilinear model, while $n$-distance captures general multilinear
depth-$3$. We design a hitting-set in time poly($n^{\delta\log k}$) for
$\delta$-distance. Further, we give an extension of our result to models where
the distance is large (close to $n$) but it is small when restricted to certain
variables. This implies the first subexponential whitebox PIT for the sum of
constantly many set-multilinear depth-$3$ circuits.
  We also explore a new model of read-once algebraic branching programs (ROABP)
where the factor-matrices are invertible (called invertible-factor ROABP). We
design a hitting-set in time poly($\text{size}^{w^2}$) for width-$w$
invertible-factor ROABP. Further, we could do without the invertibility
restriction when $w=2$. Previously, the best result for width-$2$ ROABP was
quasi-polynomial time (Forbes-Saptharishi-Shpilka, arXiv 2013).
  The common thread in all these results is the phenomenon of low-support `rank
concentration'. We exploit the structure of these models to prove
rank-concentration after a `small shift' in the variables. Our proof techniques
are stronger than the results of Agrawal-Saha-Saxena (STOC 2013) and
Forbes-Saptharishi-Shpilka (arXiv 2013); giving us quasi-polynomial-time
hitting-sets for models where no subexponential whitebox algorithms were known
before.


title:
Transiting planets from WASP-South, Euler and TRAPPIST: WASP-68 b,
  WASP-73 b and WASP-88 b, three hot Jupiters transiting evolved solar-type
  stars

abstract:
  We report the discovery by the WASP transit survey of three new hot Jupiters,
WASP-68 b, WASP-73 b and WASP-88 b. WASP-68 b has a mass of 0.95+-0.03 M_Jup, a
radius of 1.24-0.06+0.10 R_Jup, and orbits a V=10.7 G0-type star (1.24+-0.03
M_sun, 1.69-0.06+0.11 R_sun, T_eff=5911+-60 K) with a period of
5.084298+-0.000015 days. Its size is typical of hot Jupiters with similar
masses. WASP-73 b is significantly more massive (1.88-0.06+0.07 M_Jup) and
slightly larger (1.16-0.08+0.12 R_Jup) than Jupiter. It orbits a V=10.5 F9-type
star (1.34-0.04+0.05 M_sun, 2.07-0.08+0.19 R_sun, T_eff=6036+-120 K) every
4.08722+-0.00022 days. Despite its high irradiation (2.3 10^9 erg s^-1 cm^-2),
WASP-73 b has a high mean density (1.20-0.30+0.26 \rho_Jup) that suggests an
enrichment of the planet in heavy elements. WASP-88 b is a 0.56+-0.08 M_Jup
planet orbiting a V=11.4 F6-type star (1.45+-0.05 M_sun, 2.08-0.06+0.12 R_sun,
T_eff=6431+-130 K) with a period of 4.954000+-0.000019 days. With a radius of
1.70-0.07+0.13 R_Jup, it joins the handful of planets with super-inflated
radii. The ranges of ages we determine through stellar evolution modeling are
4.2-8.3 Gyr for WASP-68, 2.7-6.4 Gyr for WASP-73 and 1.8-5.3 Gyr for WASP-88.
WASP-73 appears to be a significantly evolved star, close to or already in the
subgiant phase. WASP-68 and WASP-88 are less evolved, although in an advanced
stage of core H-burning.


title: Non-abelian resonance: product and coproduct formulas

abstract:
  We investigate the resonance varieties attached to a commutative differential
graded algebra and to a representation of a Lie algebra, with emphasis on how
these varieties behave under finite products and coproducts.


title: The Lipschitz metric on deformation spaces of $G$-trees

abstract:
  For a finitely generated group $G$, we introduce an asymmetric pseudometric
on projectivized deformation spaces of $G$-trees, using stretching factors of
$G$-equivariant Lipschitz maps, that generalizes the Lipschitz metric on Outer
space and is an analogue of the Thurston metric on Teichm\"uller space. We show
that in the case of irreducible $G$-trees distances are always realized by
minimal stretch maps, can be computed in terms of hyperbolic translation
lengths, and geodesics exist. We then study displacement functions on
projectivized deformation spaces of $G$-trees and classify automorphisms of
$G$. As an application, we prove existence of train track representatives for
irreducible automorphisms of virtually free groups and nonelementary
generalized Baumslag-Solitar groups that contain no solvable Baumslag-Solitar
group $BS(1,n)$ with $n\geq 2$.


title:
Quantization and Greed are Good: One bit Phase Retrieval, Robustness and
  Greedy Refinements

abstract:
  In this paper, we study the problem of robust phase recovery. We investigate
a novel approach based on extremely quantized (one-bit) phase-less measurements
and a corresponding recovery scheme. The proposed approach has surprising
robustness and stability properties and, unlike currently available methods,
allows to efficiently perform phase recovery from measurements affected by
severe (possibly unknown) non-linear perturbations, such as distortions (e.g.
clipping). Beyond robustness, we show how our approach can be used within
greedy approaches based on alternating minimization. In particular, we propose
novel initialization schemes for the alternating minimization achieving
favorable convergence properties with improved sample complexity.


title:
Welfare Maximization and Truthfulness in Mechanism Design with Ordinal
  Preferences

abstract:
  We study mechanism design problems in the {\em ordinal setting} wherein the
preferences of agents are described by orderings over outcomes, as opposed to
specific numerical values associated with them. This setting is relevant when
agents can compare outcomes, but aren't able to evaluate precise utilities for
them. Such a situation arises in diverse contexts including voting and matching
markets.
  Our paper addresses two issues that arise in ordinal mechanism design. To
design social welfare maximizing mechanisms, one needs to be able to
quantitatively measure the welfare of an outcome which is not clear in the
ordinal setting. Second, since the impossibility results of Gibbard and
Satterthwaite~\cite{Gibbard73,Satterthwaite75} force one to move to randomized
mechanisms, one needs a more nuanced notion of truthfulness.
  We propose {\em rank approximation} as a metric for measuring the quality of
an outcome, which allows us to evaluate mechanisms based on worst-case
performance, and {\em lex-truthfulness} as a notion of truthfulness for
randomized ordinal mechanisms. Lex-truthfulness is stronger than notions
studied in the literature, and yet flexible enough to admit a rich class of
mechanisms {\em circumventing classical impossibility results}. We demonstrate
the usefulness of the above notions by devising lex-truthful mechanisms
achieving good rank-approximation factors, both in the general ordinal setting,
as well as structured settings such as {\em (one-sided) matching markets}, and
its generalizations, {\em matroid} and {\em scheduling} markets.


title: Universally Optimal Noisy Quantum Walks on Complex Networks

abstract:
  Transport properties play a crucial role in several fields of science, as
biology, chemistry, sociology, information science, and physics. The behavior
of many dynamical processes running over complex networks is known to be
closely related to the geometry of the underlying topology, but this connection
becomes even harder to understand when quantum effects come into play. Here, we
exploit the Kossakoski-Lindblad formalism of quantum stochastic walks to
investigate the capability to quickly and robustly transmit energy (or
information) between two distant points in very large complex structures,
remarkably assisted by external noise and quantum features as coherence. An
optimal mixing of classical and quantum transport is, very surprisingly, quite
universal for a large class of complex networks. This widespread behaviour
turns out to be also extremely robust with respect to geometry changes. These
results might pave the way for designing optimal bio-inspired geometries of
efficient transport nanostructures that can be used for solar energy and also
quantum information and communication technologies.


title: Optimal, robust geometries for coherent excitation transport

abstract:
  Coherent transport promises to be the basis for an emerging new technology.
Notwithstanding, a mechanistic understanding of the fundamental principles
behind optimal scattering media is still missing. Here, complex network
analysis is applied for the characterization of geometries that result in
optimal coherent transport. The approach is tailored towards the elucidation of
the subtle relationship between transport and geometry. Investigating systems
with a different number of elementary units allows us to identify classes of
structures which are common to all system sizes and which possess distinct
robustness features. In particular, we find that small groups of two or three
sites closely packed together that do not carry excitation at any time are
fundamental to realize efficient and robust excitation transport. Features
identified in small systems recur also in larger systems, what suggests that
such strategy can efficiently be used to construct close-to-optimal transport
properties irrespective of the system size.


title:
The importance of Charge Fluctuations for the Topological Phase in
  SmB$_6$

abstract:
  The discovery of topologically non-trivial states in band insulators has
induced an extensive search for topological phase in strongly correlated
electron systems. In particular, samarium hexaboride (SmB$_6$) has drawn much
attention as it might represent a new class of condensed matter called
topological Kondo insulator. Kondo insulators (KI) can have non-trivial Z$_2$
topology because the energy gap opens at the Fermi energy ($E_F$) by
hybridization between an odd- parity renormalized $f$ band and an even- parity
conduction $d$ band. However, the characteristics of SmB$_6$ deviate from the
conventional KI because its gap is insensitive to doping and pressure. Thus, it
is unclear what makes the gap of SmB$_6$ different from that of KI, and how the
band inversion features occur. In this manuscript, we demonstrate the
importance of charge fluctuations in SmB$_6$. Our angle-resolved photoemission
spectroscopy (ARPES) results reveal that with decreasing temperature the bottom
of the $d$-$f$ hybridized band at the $\bar{\text{X}}$ point gradually shifts
from below to above $E_F$. This shift accompanies a redistribution of spectral
weight from the upper to the lower quasiparticle band, and reflects the change
in both carrier density and the number of localized $f$ electron. Moreover,
because this hybridized band is predicted to have odd parity and to induce a
non-trivial $Z_{2}$ topology, we compare our ARPES spectra with theoretical
surface band structures and find signatures of topological surface states.
Therefore, our results indicate that SmB$_6$ is a charge fluctuating
topological insulator having the odd-parity hybridized band above $E_F$ at the
$X$ point. This demonstrates that the charge fluctuations do not only drive the
insulating bulk phase but also the non-trivial topological phase.


title:
Wiener-Hopf operators in higher dimensions: the Widom conjecture for
  piece-wise smooth domains

abstract:
  We prove a two-term quasi-classical trace asymptotic formula for the
functions of multi-dimensional Wiener-Hopf operators with discontinuous
symbols. The discontinuities occur on the surfaces which are assumed to be
piece-wise smooth. Such a two-term formula was conjectured by H. Widom in 1982,
and proved by A. V Sobolev for smooth surfaces in 2009.


title: Discovery of the first B[e] supergiants in M 31

abstract:
  B[e] supergiants (B[e]SGs) are transitional objects in the post-main sequence
evolution of massive stars. The small number of B[e]SGs known so far in the
Galaxy and the Magellanic Clouds indicates that this evolutionary phase is
short. Nevertheless, the strong aspherical mass loss occurring during this
phase, which leads to the formation of rings or disk-like structures, and the
similarity to possible progenitors of SN1987A emphasize the importance of
B[e]SGs for the dynamics of the interstellar medium as well as stellar and
galactic chemical evolution. The number of objects and their mass loss behavior
at different metallicities are essential ingredients for accurate predictions
from stellar and galactic evolution calculations. However, B[e]SGs are not
easily identified, as they share many characteristics with luminous blue
variables (LBVs) in their quiescent (hot) phase. We present medium-resolution
near-infrared K-band spectra for four stars in M 31, which have been assigned a
hot LBV (candidate) status. Applying diagnostics that were recently developed
to distinguish B[e]SGs from hot LBVs, we classify two of the objects as
bonafide LBVs; one of them currently in outburst. In addition, we firmly
classify the two stars 2MASS J00441709+4119273 and 2MASS J00452257+4150346 as
the first B[e]SGs in M 31 based on strong CO band emission detected in their
spectra, and infrared colors typical for this class of stars.


title: Jordan tori for a torsion free abelian group

abstract:
  We classify Jordan $G$-tori, where $G$ is any torsion-free abelian group.
Using the Zelmanov prime structure theorem, such a class divides into three
types, namely, {the Hermitian type, the Clifford type and the Albert type.} We
concretely describe Jordan $G$-tori of each type.


title:
Generation of reference dc currents at 1 nA level with the
  capacitance-charging method

abstract:
  The capacitance-charging method is a well-established and handy technique for
the generation of dc current in the 100 pA range or lower. The method involves
a capacitance standard and a sampling voltmeter, highly stable devices easy to
calibrate, and it is robust and insensitive to the voltage burden of the
instrument being calibrated. We propose here a range extender amplifier, which
can be employed as a plug-in component in existing calibration setups, and
allows the generation of currents in the 1 nA range. The extender has been
employed in the INRIM setup and validated with two comparisons at 100 pA and 1
nA current level. The calibration accuracy achieved on a top-class instrument
is 10 ppm at 1 nA.


title: Spin glasses: the game

abstract:
  This document presents the rules of a tactical two-player board game which is
inspired by spin glasses. The aim is, while placing bonds and spins, to achieve
a majority of the spins facing the chosen direction of each player. The game
has been already successfully used in university teaching but should be
accessible to players from age 10 and up. (Note that there is a non-physics
version of the rules available at www.compphys.uni-oldenburg.de which
formulates the game in terms of a comptetion between party hosts.) Material is
included such that a cheap version of the board game can be made using a color
printer, scissors and glue.


title: Bayesian alignment of similarity shapes

abstract:
  We develop a Bayesian model for the alignment of two point configurations
under the full similarity transformations of rotation, translation and scaling.
Other work in this area has concentrated on rigid body transformations, where
scale information is preserved, motivated by problems involving molecular data;
this is known as form analysis. We concentrate on a Bayesian formulation for
statistical shape analysis. We generalize the model introduced by Green and
Mardia [Biometrika 93 (2006) 235-254] for the pairwise alignment of two
unlabeled configurations to full similarity transformations by introducing a
scaling factor to the model. The generalization is not straightforward, since
the model needs to be reformulated to give good performance when scaling is
included. We illustrate our method on the alignment of rat growth profiles and
a novel application to the alignment of protein domains. Here, scaling is
applied to secondary structure elements when comparing protein folds;
additionally, we find that one global scaling factor is not in general
sufficient to model these data and, hence, we develop a model in which multiple
scale factors can be included to handle different scalings of shape components.


title:
\"Uber eine Ungleichung von Schmidt und Summerer f\"ur diophantische
  Exponenten von Linearenformen in drei Variablen

abstract:
  We give a simple proof of a recent inequality by W.M. Schmidt and L. Summerer
concerning Diophantine exponents for a linear form in three real variables.


title:
Boundedness of semilinear Duffing equations at resonance with
  oscillating nonlinearities

abstract:
  In this paper, we prove the boundedness of all the solutions for the equation
$\ddot{x}+n^2x+g(x)+\psi'(x)=p(t)$ with the Lazer-Leach condition on $g$ and
$p$, where $n\in \mathbb{N^+}$, $p(t)$ and $\psi'(x)$ are periodic and $g(x)$
is bounded. For the critical situation that $\big |\int_0^{2\pi}p(t)e^{int}dt
\big|=2\big|g(+\infty)-g(-\infty)\big|$, we also prove a sufficient and
necessary condition for the boundedness if $\psi'(x)\equiv0$.


title: Anomalous transport with overlap fermions

abstract:
  Anomalous correlators of vector and axial currents which enter the Kubo
formulae for the chiral magnetic and the chiral separation conductivities are
explicitly calculated for free overlap fermions on the lattice. The results are
confronted with continuum calculations in the finite-temperature
regularization, and a subtle point of such regularization for chiral magnetic
conductivity related to the correct counting of the chiral states is
highlighted. In agreement with some previous claims in the literature, we find
that in a lattice regularization which respects gauge invariance, the chiral
magnetic conductivity vanishes. We point out that the relation of anomalous
transport coefficients to axial anomaly is nontrivial due to the
non-commutativity of their infrared limit and the Taylor expansion in baryon or
chiral chemical potential. In particular, we argue that the vector and axial
Ward identities fix the asymptotic behavior of anomalous current-current
correlators in the limit of large momenta. Basing on the work of Knecht et al.
on the perturbative non-renormalization of the transverse part of the
correlator of two vector and one axial currents, we demonstrate that the
relation of the anomalous vector-vector correlator to axial anomaly holds
perturbatively in massless QCD but might be subject to non-perturbative
corrections. Finally, we identify kinematical regimes in which the anomalous
transport coefficients can be extracted from lattice measurements.


title: Non-emptiness of Brill-Noether loci in M(2,L)

abstract:
  Let $C$ be a smooth projective complex curve of genus $g \geq 2$. We
investigate the Brill-Noether locus consisting of stable bundles of rank 2 and
determinant $L$ of odd degree $d$ having at least $k$ independent sections.
This locus possesses a virtual fundamental class. We show that in many cases
this class is non-zero, which implies that the Brill-Noether locus is
non-empty. For many values of $d$ and $k$ the result is best possible. We
obtain more precise results for $k\le5$. An appendix contains the proof of a
combinatorial lemma which we need.


title:
Studies of azimuthal dihadron correlations in ultra-central PbPb
  collisions at sqrt(s[NN]) = 2.76 TeV

abstract:
  Azimuthal dihadron correlations of charged particles have been measured in
PbPb collisions at sqrt(s[NN]) = 2.76 TeV by the CMS collaboration, using data
from the 2011 LHC heavy-ion run. The data set includes a sample of
ultra-central (0-0.2% centrality) PbPb events collected using a trigger based
on total transverse energy in the hadron forward calorimeters and the total
multiplicity of pixel clusters in the silicon pixel tracker. A total of about
1.8 million ultra-central events were recorded, corresponding to an integrated
luminosity of 120 inverse microbarns. The observed correlations in
ultra-central PbPb events are expected to be particularly sensitive to
initial-state fluctuations. The single-particle anisotropy Fourier harmonics,
from v[2] to v[6], are extracted as a function of particle transverse momentum.
At higher transverse momentum, the v[2] harmonic becomes significantly smaller
than the higher-order v[n] (n greater than or equal to 3). The pt-averaged v[2]
and v[3] are found to be equal within 2%, while higher-order v[n] decrease as n
increases. The breakdown of factorization of dihadron correlations into
single-particle azimuthal anisotropies is observed. This effect is found to be
most prominent in the ultra-central PbPb collisions, where the initial-state
fluctuations play a dominant role. A comparison of the factorization data to
hydrodynamic predictions with event-by-event fluctuating initial conditions is
also presented.


title:
Multi-frequency constraints on the non-thermal pressure in galaxy
  clusters

abstract:
  The origin of radio halos in galaxy clusters is still unknown and is the
subject of a vibrant debate both from the observational and theoretical point
of view. In particular the amount and the nature of non-thermal plasma and of
the magnetic field energy density in clusters hosting radio halos is still
unclear. The aim of this paper is to derive an estimate of the pressure ratio X
between the non-thermal and thermal plasma in radio halo clusters that have
combined radio, X-ray and SZ effect observations. From the simultaneous
P_{1.4}-L_X and P_{1.4}-Y_{SZ} correlations for a sample of clusters observed
with Planck, we derive a correlation between Y_{SZ} and L_X that we use to
derive a value for X. This is possible since the Compton parameter Y_{SZ} is
proportional to the total plasma pressure in the cluster (that we characterize
as the sum of the thermal and non-thermal pressure) while the X-ray luminosity
L_X is proportional only to the thermal pressure of the intracluster plasma.
Our results indicate that the average (best fit) value of the pressure ratio in
a self-similar cluster formation model is X =0.55 \pm 0.05 in the case of an
isothermal beta-model with beta=2/3 and a core radius r_c = 0.3 R_{500} holding
on average for the cluster sample. We also show that the theoretical prediction
for the Y_{SZ}-L_X correlation in this model has a slope that is steeper than
the best fit value for the available data. The agreement with the data can be
recovered if the pressure ratio X decreases with increasing X-ray luminosity as
L_X^{-0.96}. We conclude that the available data on radio halo clusters
indicate a substantial amount of non-thermal pressure in cluster atmospheres
whose value must decrease with increasing X-ray luminosity, or increasing
cluster mass (temperature). (abridged)


title: Understanding Deep Architectures using a Recursive Convolutional Network

abstract:
  A key challenge in designing convolutional network models is sizing them
appropriately. Many factors are involved in these decisions, including number
of layers, feature maps, kernel sizes, etc. Complicating this further is the
fact that each of these influence not only the numbers and dimensions of the
activation units, but also the total number of parameters. In this paper we
focus on assessing the independent contributions of three of these linked
variables: The numbers of layers, feature maps, and parameters. To accomplish
this, we employ a recursive convolutional network whose weights are tied
between layers; this allows us to vary each of the three factors in a
controlled setting. We find that while increasing the numbers of layers and
parameters each have clear benefit, the number of feature maps (and hence
dimensionality of the representation) appears ancillary, and finds most of its
benefit through the introduction of more weights. Our results (i) empirically
confirm the notion that adding layers alone increases computational power,
within the context of convolutional layers, and (ii) suggest that precise
sizing of convolutional feature map dimensions is itself of little concern;
more attention should be paid to the number of parameters in these layers
instead.


title:
Giant magnetoresistance and perfect spin filter in silicene, germanene,
  and stanene

abstract:
  Silicene, germanene and stanene are two-dimensional topological insulators
exhibiting helical edge states. We investigate global and local manipulations
at the edges by exposing them to (i) a charge-density-wave order, (ii) a
superconductor, (iii) an out-of-plane antiferromagnetic, and (iv) an in-plane
antiferromagnetic field. We show that these perturbations affect the helical
edge states in a different fashion. As a consequence one can realize quantum
spin-Hall effect without edge states. In addition, these edge manipulations
lead to very promising applications: a giant magnetoresistance and a perfect
spin filter. We also investigate the effect of manipulations on a very few
edge-sites of a topological insulator nanodisk.


title:
A relative basis for mixed Tate motives over the projective line minus
  three points

abstract:
  In a previous work, the author have built two families of distinguished
algebraic cycles in Bloch-Kriz cubical cycle complex over the projective line
minus three points. The goal of this paper is to show how these cycles induce
well-defined elements in the $\HH^0$ of the bar construction of the cycle
complex and thus generated comodules over this $\HH^0$, that is a mixed Tate
motives as in Bloch and Kriz construction. In addition, it is shown that out of
the two families only ones is needed at the bar construction level. As a
consequence, the author obtains that one of the family gives a basis of the
tannakian coLie coalgebra of mixed Tate motives over $\ps$ relatively to the
tannakian coLie coalgebra of mixed Tate motives over $\Sp(\Q)$. This in turns
provides a new formula for Goncharov motivic coproduct, which arise explicitly
as the coaction dual to Ihara action by special derivations.


title: Single and dual fiber nano-tip optical tweezers: trapping and analysis

abstract:
  An original optical tweezers using one or two chemically etched fiber
nano-tips is developed. We demonstrate optical trapping of 1 micrometer
polystyrene spheres at optical powers down to 2 mW. Harmonic trap potentials
were found in the case of dual fiber tweezers by analyzing the trapped particle
position fluctuations. The trap stiffness was deduced using three different
models. Consistent values of up to 1 fN/nm were found. The stiffness linearly
decreases with decreasing light intensity and increasing fiber tip-to-tip
distance.


title:
Stability of large periodic solutions of Klein-Gordon near a homoclinic
  orbit

abstract:
  We consider a Klein-Gordon equation (KG) on a Riemannian compact surface, for
which the flow lets invariant the two dimensional space the solutions
independent of the space variable. It turns out that in this invariant space,
there is a homoclinic orbit to the origin, and a family of periodic solutions
inside the loops of the homoclinic orbit. In this paper we study the stability
of these periodic orbits under the (KG) flow, i.e. when turning on the
nonlinear interaction with the non stationary modes. By a shadowing method, we
prove that around the periodic orbits, solutions stay close to them during a
time of order $(\log a)^2$, where $a$ is the distance between the periodic
orbit considered and the homoclinic orbit.


title:
Parametrizing the local dark matter speed distribution: a detailed
  analysis

abstract:
  In a recent paper, a new parametrization for the dark matter (DM) speed
distribution f(v) was proposed for use in the analysis of data from direct
detection experiments. This parametrization involves expressing the logarithm
of the speed distribution as a polynomial in the speed v. We present here a
more detailed analysis of the properties of this parametrization. We show that
the method leads to statistically unbiased mass reconstructions and exact
coverage of credible intervals. The method performs well over a wide range of
DM masses, even when finite energy resolution and backgrounds are taken into
account. We also show how to select the appropriate number of basis functions
for the parametrization. Finally, we look at how the speed distribution itself
can be reconstructed, and how the method can be used to determine if the data
are consistent with some test distribution. In summary, we show that this
parametrization performs consistently well over a wide range of input
parameters and over large numbers of statistical ensembles and can therefore
reliably be used to reconstruct both the DM mass and speed distribution from
direct detection data.


title: Une loi de r\'eciprocit\'e explicite pour le polylogarithme elliptique

abstract:
  We construct a dual exponential map which relates the $p$-adic Eisenstein
classes to Eisenstein series. From this map, we deduce a compatibility between
the $p$-adic realization and the de Rham realization of the torsion sections of
the elliptic polylogarithm prosheaf.


title:
Generalized Thomson problem in arbitrary dimensions and non-euclidean
  geometries

abstract:
  Systems of identical particles with equal charge are studied under a special
type of confinement. These classical particles are free to move inside some
convex region S and on the boundary of it $\Omega$ (the $S^{d-1}-$ sphere, in
our case). We shall show how particles arrange themselves under the sole action
of the Coulomb repulsion in many dimensions in the usual Euclidean space,
therefore generalizing the so called Thomson problem to many dimensions. Also,
we explore how the problem varies when non-Euclidean geometries are considered.
We shall see that optimal configurations in all cases possess a high degree of
symmetry, regardless of the concomitant dimension or geometry.


title: Embeddings into Thompson's group $V$ and $co\mathcal{CF}$ groups

abstract:
  Lehnert and Schweitzer show in [20] that R. Thompson's group $V$ is a
co-context-free ($co\mathcal{CF}$) group, thus implying that all of its
finitely generated subgroups are also $co\mathcal{CF}$ groups. Also, Lehnert
shows in his thesis that $V$ embeds inside the $co\mathcal{CF}$ group
$\mathrm{QAut}(\mathcal{T}_{2,c})$, which is a group of particular bijections
on the vertices of an infinite binary $2$-edge-colored tree, and he conjectures
that $\mathrm{QAut}(\mathcal{T}_{2,c})$ is a universal $co\mathcal{CF}$ group.
We show that $\mathrm{QAut}(\mathcal{T}_{2,c})$ embeds into $V$, and thus
obtain a new form for Lehnert's conjecture. Following up on these ideas, we
begin work to build a representation theory into R. Thompson's group $V$. In
particular we classify precisely which Baumslag-Solitar groups embed into $V$.


title:
Bayesian nonparametric hierarchical modeling for multiple membership
  data in grouped attendance interventions

abstract:
  We develop a dependent Dirichlet process (DDP) model for repeated measures
multiple membership (MM) data. This data structure arises in studies under
which an intervention is delivered to each client through a sequence of
elements which overlap with those of other clients on different occasions. Our
interest concentrates on study designs for which the overlaps of sequences
occur for clients who receive an intervention in a shared or grouped fashion
whose memberships may change over multiple treatment events. Our motivating
application focuses on evaluation of the effectiveness of a group therapy
intervention with treatment delivered through a sequence of cognitive
behavioral therapy session blocks, called modules. An open-enrollment protocol
permits entry of clients at the beginning of any new module in a manner that
may produce unique MM sequences across clients. We begin with a model that
composes an addition of client and multiple membership module random effect
terms, which are assumed independent. Our MM DDP model relaxes the assumption
of conditionally independent client and module random effects by specifying a
collection of random distributions for the client effect parameters that are
indexed by the unique set of module attendances. We demonstrate how this
construction facilitates examining heterogeneity in the relative effectiveness
of group therapy modules over repeated measurement occasions.


title:
Deriving tight error-trade-off relations for approximate joint
  measurements of incompatible quantum observables

abstract:
  The quantification of the "measurement uncertainty" aspect of Heisenberg's
Uncertainty Principle---that is, the study of trade-offs between accuracy and
disturbance, or between accuracies in an approximate joint measurement on two
incompatible observables---has regained a lot of interest recently. Several
approaches have been proposed and debated. In this paper we consider Ozawa's
definitions for inaccuracies (as root-mean-square errors) in approximate joint
measurements, and study how these are constrained in different cases, whether
one specifies certain properties of the approximations---namely their standard
deviations and/or their bias---or not. Extending our previous work [C.
Branciard, Proc. Natl. Acad. Sci. U.S.A. 110, 6742 (2013)], we derive new
error-trade-off relations, which we prove to be tight for pure states. We show
explicitly how all previously known relations for Ozawa's inaccuracies follow
from ours. While our relations are in general not tight for mixed states, we
show how these can be strengthened and how tight relations can still be
obtained in that case.


title: How Santa Fe Ants Evolve

abstract:
  The Santa Fe Ant model problem has been extensively used to investigate, test
and evaluate Evolutionary Computing systems and methods over the past two
decades. There is however no literature on its program structures that are
systematically used for fitness improvement, the geometries of those structures
and their dynamics during optimization. This paper analyzes the Santa Fe Ant
Problem using a new phenotypic schema and landscape analysis based on executed
instruction sequences. For the first time we detail systematic structural
features that give high fitness and the evolutionary dynamics of such
structures. The new schema avoids variances due to introns. We develop a
phenotypic variation method that tests the new understanding of the landscape.
We also develop a modified function set that tests newly identified
synchronization constraints. We obtain favorable computational efforts compared
to those in the literature, on testing the new variation and function set on
both the Santa Fe Trail, and the more computationally demanding Los Altos
Trail. Our findings suggest that for the Santa Fe Ant problem, a perspective of
program assembly from repetition of highly fit responses to trail conditions
leads to better analysis and performance.


title:
Interfaces with internal structures in generalized rock-paper-scissors
  models

abstract:
  In this work we investigate the development of stable dynamical structures
along interfaces separating domains belonging to enemy partnerships, in the
context of cyclic predator-prey models with an even number of species $N \ge
8$. We use both stochastic and field theory simulations in one and two spatial
dimensions, as well as analytical arguments, to describe the association at the
interfaces of mutually neutral individuals belonging to enemy partnerships and
to probe their role in the development of the dynamical structures at the
interfaces. We identify an interesting behaviour associated to the symmetric or
asymmetric evolution of the interface profiles depending on whether $N/2$ is
odd or even, respectively. We also show that the macroscopic evolution of the
interface network is not very sensitive internal structure of the interfaces.
Although this work focus on cyclic predator prey-models with an even number of
species, we argue that the results are expected to be quite generic in the
context of spatial stochastic May-Leonard models.


title: Flexible queries in XML native databases

abstract:
  To date, most of the XML native databases (DB) flexible querying systems are
based on exploiting the tree structure of their semi structured data (SSD).
However, it becomes important to test the efficiency of Formal Concept Analysis
(FCA) formalism for this type of data since it has been proved a great
performance in the field of information retrieval (IR). So, the IR in XML
databases based on FCA is mainly based on the use of the lattice structure.
Each concept of this lattice can be interpreted as a pair (response, query). In
this work, we provide a new flexible modeling of XML DB based on fuzzy FCA as a
first step towards flexible querying of SSD.


title:
A geometric approach to the distribution of quantum states in bipartite
  physical systems

abstract:
  Any set of pure states living in an given Hilbert space possesses a natural
and unique metric --the Haar measure-- on the group $U(N)$ of unitary matrices.
However, there is no specific measure induced on the set of eigenvalues
$\Delta$ of any density matrix $\rho$. Therefore, a general approach to the
global properties of mixed states depends on the specific metric defined on
$\Delta$. In the present work we shall employ a simple measure on $\Delta$ that
has the advantage of possessing a clear geometric visualization whenever
discussing how arbitrary states are distributed according to some measure of
mixedness. The degree of mixture will be that of the participation ratio
$R=1/Tr(\rho^2)$ and the concomitant maximum eigenvalue $\lambda_m$. The cases
studied will be the qubit-qubit system and the qubit-qutrit system, whereas
some discussion will be made on higher-dimensional bipartite cases in both the
$R$-domain and the $\lambda_m$-domain.


title:
Host redshifts from gravitational-wave observations of binary neutron
  star mergers

abstract:
  Inspiralling compact binaries as standard sirens will soon become an
invaluable tool for cosmology when advanced interferometric gravitational-wave
detectors begin their observations in the coming years. However, a degeneracy
in the information carried by gravitational waves between the total rest-frame
mass $M$ and the redshift $z$ of the source implies that neither can be
directly extracted from the signal, but only the combination $M(1+z)$, the
redshifted mass. Recent work has shown that for binary neutron star systems, a
tidal correction to the gravitational-wave phase in the late-inspiral signal
that depends on the rest-frame source mass could be used to break the
mass-redshift degeneracy. We propose here to use the signature encoded in the
post-merger signal to deduce the redshift to the source. This will allow an
accurate extraction of the intrinsic rest-frame mass of the source, in turn
permitting the determination of source redshift and luminosity distance solely
from gravitational-wave observations. This will herald a new era in precision
cosmography and astrophysics. Using numerical simulations of binary neutron
star mergers of very slightly different mass, we model gravitational-wave
signals at different redshifts and use Bayesian parameter estimation to
determine the accuracy with which the redshift can be extracted for a source of
known mass. We find that the Einstein Telescope can determine the source
redshift to $sim 10$--$20%$ at redshifts of $z<0.04$.


title: On Some Models for Elastic Solids with Micro-Structure

abstract:
  We review the concept of well-posedness in the context of evolutionary
problems from mathematical physics for a particular subclass of problems from
elasticity theory. The complexity of physical phenomena appears as encoded in
so called material laws. The usefulness of the structural perspective developed
is illustrated by showing that many initial boundary value problems in the
theory of elastic solids share the same type of solution theory. Moreover,
interconnections of the respective models are discussed via a previously
introduced mother/descendant mechanism.


title:
Relativistic viscous hydrodynamics for heavy-ion collisions: A
  comparison between the Chapman-Enskog and Grad methods

abstract:
  Derivations of relativistic second-order dissipative hydrodynamic equations
have relied almost exclusively on the use of Grad's 14-moment approximation to
write $f(x,p)$, the nonequilibrium distribution function in the phase space.
Here we consider an alternative Chapman-Enskog-like method, which, unlike
Grad's, involves a small expansion parameter. We derive an expression for
$f(x,p)$ to second order in this parameter. We show analytically that while
Grad's method leads to the violation of the experimentally observed
$1/\sqrt{m_T}$ scaling of the longitudinal femtoscopic radii, the alternative
method does not exhibit such an unphysical behavior. We compare numerical
results for hadron transverse-momentum spectra and femtoscopic radii obtained
in these two methods, within the one-dimensional scaling expansion scenario.
Moreover, we demonstrate a rapid convergence of the Chapman-Enskog-like
expansion up to second order. This leads to an expression for $\delta f(x,p)$
which provides a better alternative to Grad's approximation for hydrodynamic
modeling of relativistic heavy-ion collisions.


title: Study of the solar wind-magnetosphere coupling on different time scales

abstract:
  Solar wind-magnetosphere coupling, its causes and consequences have been
studied for the last several decades. However, the assessment of continuously
changing behaviour of the sun, plasma and field flows in the interplanetary
space and their influence on geomagnetic activity is still a subject of intense
research. Search for the best possible coupling function is also important for
space weather prediction. We utilize four geomagnetic indices (ap, aa, AE and
Dst) as parameters of geomagnetic activity level in the earth's magnetosphere.
In addition to these indices, we utilize various solar wind plasma and field
parameters for the corresponding periods. We analyse the geomagnetic activity
and plasma/field parameters at yearly, half-yearly, 27-day, daily, 3-hourly,
and hourly time resolutions. Regression analysis using geomagnetic and solar
wind data of different time resolutions, over a continuous long period, and at
different phases of solar activity (increasing including maximum/decreasing
including minimum) led us to suggest that two parameters BV/1000 (mV/m) and BV2
(mV/s) are highly correlated with the all four geomagnetic activity indices not
only at any particular time scale but at different time scales. It probably
suggests for some role of the fluctuations/variations in interplanetary
electric potential, its spacial variation [i.e., interplanetary electric field
BV (mV/m)] and/or time variation [BV2 (mV/s)], in influencing the reconnection
rate.

categories: astro-ph.SR astro-ph.EP physics.data-an physics.space-ph


title: Rogers functions and fluctuation theory

abstract:
  Extending earlier work by Rogers, Wiener-Hopf factorisation is studied for a
class of functions closely related to Nevanlinna-Pick functions and complete
Bernstein functions. The name 'Rogers functions' is proposed for this class.
Under mild additional condition, for a Rogers function f, the Wiener--Hopf
factors of f(z)+q, as well as their ratios, are proved to be complete Bernstein
functions in both z and q. This result has a natural interpretation in
fluctuation theory of L\'evy processes: for a L\'evy process X_t with
completely monotone jumps, under mild additional condition, the Laplace
exponents kappa(q;z), kappa*(q;z) of ladder processes are complete Bernstein
functions of both z and q. Integral representation for these Wiener--Hopf
factors is studied, and a semi-explicit expression for the space-only Laplace
transform of the supremum and the infimum of X_t follows.


title: Enumeration of $k$-Fibonacci Paths using Infinite Weighted Automata

abstract:
  In this paper, we introduce a new family of generalized colored Motzkin
paths, where horizontal steps are colored by means of $F_{k,l}$ colors, where
$F_{k,l}$ is the $l$th $k$-Fibonacci number. We study the enumeration of this
family according to the length. For this, we use infinite weighted automata.


title: Linking Theorems of Local Semiflows on Complete Metric Spaces

abstract:
  In this paper we prove some linking theorems and mountain pass type results
for dynamical systems in terms of local semiflows on complete metric spaces.
Our results provide an alternative approach to detect the existence of compact
invariant sets without using the Conley index theory. They can also be applied
to variational problems of elliptic equations without verifying the classical
P.S. Condition.
  As an example, we study the resonant problem of the nonautonomous parabolic
equation $ u_t-\Delta u-\mu u=f(u)+g(x,t) $ on a bounded domain. The existence
of a recurrent solution is proved under some Landesman-Laser type conditions by
using an appropriate linking theorem of semiflows. Another example is the
elliptic equation $-\Delta u+a(x)u=f(x,u)$ on $R^n$. We prove the existence of
positive solutions by applying a mountain pass lemma of semiflows to the
parabolic flow of the problem.


title: Parallel inversion of huge covariance matrices

abstract:
  An extremely common bottleneck encountered in statistical learning algorithms
is inversion of huge covariance matrices, examples being in evaluating Gaussian
likelihoods for a large number of data points. We propose general parallel
algorithms for inverting positive definite matrices, which are nearly rank
deficient. Such matrix inversions are needed in Gaussian process computations,
among other settings, and remain a bottleneck even with the increasing
literature on low rank approximations. We propose a general class of algorithms
for parallelizing computations to dramatically speed up computation time by
orders of magnitude exploiting multicore architectures. We implement our
algorithm on a cloud computing platform, providing pseudo and actual code. The
algorithm can be easily implemented on any multicore parallel computing
resource. Some illustrations are provided to give a flavor for the gains and
what becomes possible in freeing up this bottleneck.


title:
Energy-Efficient, Large-scale Distributed-Antenna System (L-DAS) for
  Multiple Users

abstract:
  Large-scale distributed-antenna system (L-DAS) with very large number of
distributed antennas, possibly up to a few hundred antennas, is considered. A
few major issues of the L-DAS, such as high latency, energy consumption,
computational complexity, and large feedback (signaling) overhead, are
identified. The potential capability of the L-DAS is illuminated in terms of an
energy efficiency (EE) throughout the paper. We firstly and generally model the
power consumption of an L-DAS, and formulate an EE maximization problem. To
tackle two crucial issues, namely the huge computational complexity and large
amount of feedback (signaling) information, we propose a channel-gain-based
antenna selection (AS) method and an interference-based user clustering (UC)
method. The original problem is then split into multiple subproblems by a
cluster, and each cluster's precoding and power control are managed in parallel
for high EE. Simulation results reveal that i) using all antennas for
zero-forcing multiuser multiple-input multiple-output (MU-MIMO) is energy
inefficient if there is nonnegligible overhead power consumption on MU-MIMO
processing, and ii) increasing the number of antennas does not necessarily
result in a high EE. Furthermore, the results validate and underpin the EE
merit of the proposed L-DAS complied with the AS, UC, precoding, and power
control by comparing with non-clustering L-DAS and colocated antenna systems.


title: Wind collisions in three massive stars of Cyg OB2

abstract:
  Aims: We wish to study the origin of the X-ray emission of three massive
stars in the Cyg OB2 association: Cyg OB2 #5, #8A, #12. Methods: To this aim,
dedicated X-ray observations from XMM and Swift are used, as well as archival
ROSAT and Suzaku data. Results: Our results on Cyg OB2 #8A improve the phase
coverage of the orbit and confirm previous studies: the signature of a
wind-wind collision is conspicuous. In addition, signatures of a wind-wind
collision are also detected in Cyg OB2 #5, but the X-ray emission appears to be
associated with the collision between the inner binary and the tertiary
component orbiting it with a 6.7yr period, without a putative collision inside
the binary. The X-ray properties strongly constrain the orbital parameters,
notably allowing us to discard some proposed orbital solutions. To improve the
knowledge of the orbit, we revisit the light curves and radial velocity of the
inner binary, looking for reflex motion induced by the third star. Finally, the
X-ray emission of Cyg OB2 #12 is also analyzed. It shows a marked decrease in
recent years, compatible with either a wind-wind collision in a wide binary or
the aftermath of a recent eruption.


title:
On maximal commutative subalgebras of Poisson algebras associated with
  involutions of semisimple Lie algebras

abstract:
  For any involution $\sigma$ of a semisimple Lie algebra $\mathfrak g$, one
constructs a non-reductive Lie algebra $\mathfrak k$, which is called a
$\mathbb Z_2$-contraction of $\mathfrak g$. In this paper, we attack the
problem of describing maximal commutative subalgebras of the Poisson algebra
$S(\mathfrak k)$. This is closely related to the study of the coadjoint
representation of $\mathfrak k$ and the set, $\mathfrak k^*_{reg}$, of the
regular elements of $\mathfrak k^*$. By our previous results, in the context of
$\mathbb Z_2$-contractions, the argument shift method provides maximal
commutative subalgebras of $S(\mathfrak k)$ whenever $codim(\mathfrak k^*
\setminus \mathfrak k^*_{reg})\ge 3$.
  Our main result here is that $codim(\mathfrak k^* \setminus \mathfrak
k^*_{reg})\ge 3$ if and only if the Satake diagram of $\sigma$ has no trivial
nodes. (A node is trivial, if it is white, has no arrows attached, and all
adjacent nodes are also white.) The list of suitable involutions is provided.
We also describe certain maximal commutative subalgebras of $S(\mathfrak k)$ if
the (-1)-eigenspace of $\sigma$ in $\mathfrak g$ contains regular elements.


title: Travel time estimation for ambulances using Bayesian data augmentation

abstract:
  We introduce a Bayesian model for estimating the distribution of ambulance
travel times on each road segment in a city, using Global Positioning System
(GPS) data. Due to sparseness and error in the GPS data, the exact ambulance
paths and travel times on each road segment are unknown. We simultaneously
estimate the paths, travel times, and parameters of each road segment travel
time distribution using Bayesian data augmentation. To draw ambulance path
samples, we use a novel reversible jump Metropolis-Hastings step. We also
introduce two simpler estimation methods based on GPS speed data. We compare
these methods to a recently published travel time estimation method, using
simulated data and data from Toronto EMS. In both cases, out-of-sample point
and interval estimates of ambulance trip times from the Bayesian method
outperform estimates from the alternative methods. We also construct
probability-of-coverage maps for ambulances. The Bayesian method gives more
realistic maps than the recently published method. Finally, path estimates from
the Bayesian method interpolate well between sparsely recorded GPS readings and
are robust to GPS location errors.


title:
On WKB theoretic transformations for Painleve transcendents on
  degenerate Stokes segments

abstract:
  The WKB theoretic transformation theorem established in [KT2] implies that
the first Painleve equation gives a normal form of Painleve equations with a
large parameter near a simple P-turning point. In this paper we extend this
result and show that the second Painleve equation (PII) and the third Painleve
equation (PIII'(D7)) of type D7 give a normal form of Painleve equations on a
degenerate P-Stokes segments connecting two different simple P-turning points
and on a degenerate P-Stokes segment of loop-type, respectively. That is, any
2-parameter formal solution of a Painleve equation is reduced to a 2-parameter
formal solution of (PII) or (PIII'(D7)) on these degenerate P-Stokes segments
by our transformation.


title:
Perspective: Tipping the scales - search for drifting constants from
  molecular spectra

abstract:
  Transitions in atoms and molecules provide an ideal test ground for
constraining or detecting a possible variation of the fundamental constants of
nature. In this Perspective, we review molecular species that are of specific
interest in the search for a drifting proton-to-electron mass ratio $\mu$. In
particular, we outline the procedures that are used to calculate the
sensitivity coefficients for transitions in these molecules and discuss current
searches. These methods have led to a rate of change in $\mu$ bounded to $6
\times 10^{-14}$/yr from a laboratory experiment performed in the present
epoch. On a cosmological time scale the variation is limited to
$|\Delta\mu/\mu| < 10^{-5}$ for look-back times of 10-12 billion years and to
$|\Delta\mu/\mu| < 10^{-7}$ for look-back times of 7 billion years. The last
result, obtained from high-redshift observation of methanol, translates into
$\dot{\mu}/\mu = (1.4 \pm 1.4) \times 10^{-17}$/yr if a linear rate of change
is assumed.


title:
Identifying Combinatorial Biomarkers by Association Rule Mining in the
  CAMD Alzheimer's Database

abstract:
  Background: The concept of combinatorial biomarkers was conceived around
2010: it was noticed that simple biomarkers are often inadequate for
recognizing and characterizing complex diseases.
  Methods: Here we present an algorithmic search method for complex biomarkers
which may predict or indicate Alzheimer's disease (AD) and other kinds of
dementia. We applied data mining techniques that are capable to uncover
implication-like logical schemes with detailed quality scoring. Our program
SCARF is capable of finding multi-factor relevant association rules
automatically. The new SCARF program was applied for the Tucson, Arizona based
Critical Path Institute's CAMD database, containing laboratory and cognitive
test data for more than 6000 patients from the placebo arm of clinical trials
of large pharmaceutical companies, and consequently, the data is much more
reliable than numerous other databases for dementia.
  Results: The results suggest connections between liver enzyme-, B12 vitamin-,
sodium- and cholesterol levels and dementia, and also some hematologic
parameter-levels and dementia.


title:
Vortex ratchet reversal in an asymmetric washboard pinning potential
  subject to combined dc and ac stimuli

abstract:
  The mixed-state resistive response of a superconductor thin film with an
asymmetric washboard pinning potential subject to superimposed dc and ac
currents of arbitrary amplitudes and frequency at finite temperature is
theoretically investigated. The problem is considered in the single-vortex
approximation, relying upon the exact solution of the Langevin equation in
terms of a matrix continued fraction. The dc voltage response and the absorbed
power in ac response are analyzed as functions of dc bias, ac current amplitude
and frequency, in a wide range of corresponding dimensionless parameters.
Predictions are made of (i) a reversal of the rectified voltage at small dc
biases and strong ac drives and (ii) a non-monotonic enhancement of the
absorbed power in the nonlinear ac response at far sub-depinning frequencies.
It is elucidated how and why both these effects appear due to the competition
of the fixed internal and the tunable, dc bias-induced external asymmetry of
the potential as the only reason. This is distinct from other scenarios used
for explaining the vortex ratchet reversal effect so far.