title: To differentiate neutron star models by X-ray polarimetry

abstract:
  The nature of pulsar is still unknown because of non-perturbative effects of
the fundamental strong interaction, and different models of pulsar inner
structures are then suggested, either conventional neutron stars or quark
stars. Additionally, a state of quark-cluster matter is conjectured for cold
matter at supranuclear density, as a result pulsars could thus be quark-cluster
stars. Besides understanding different manifestations, the most important issue
is to find an effective way to observationally differentiate those models.
X-ray polarimetry would play an important role here. In this letter, we focus
on the thermal X-ray polarization of quark/quark-cluster stars. While the
thermal X-ray linear polarization percentage is typically higher than ~10% in
normal neutron star models, the percentage of quark/quark-cluster stars is
almost zero. It could then be an effective method to identify
quark/quark-cluster stars by soft X-ray polarimetry. We are therefore expecting
to detect thermal X-ray polarization in the coming decades.


title: Injective hulls of odd cycles

abstract: The injective hulls of odd cycles are described explicitly.


title: Stochastic evolution of finite level systems: classical vs. quantum

abstract:
  Quantum dynamics of the density operator in the framework of a single
probability vector is analyzed. In this framework quantum states define a
proper convex quantum subset in an appropriate simplex. It is showed that the
corresponding dynamical map preserving a quantum subset needs not be stochastic
contrary to the classical evolution which preserves the entire simplex.
Therefore, violation of stochasticity witnesses quantumness of evolution.


title: Cosmology With Axionic-quintessence Coupled with Dark Matter

abstract:
  We study the possibility of explaining the late time acceleration with an
axion field which is coupled with the dark matter sector of the energy budget
of the Universe. The axion field arises from the Ramond-Ramond sector of the
Type-IIB string theory. We study the background evolution of the Universe as
well as the growth of the matter perturbation in the linear regime. We
subsequently use the observational data from Sn-Ia, BAO measurements,
measurements of the Hubble parameter as well as the observational data for the
growth of the matter perturbation to constrain our model. Our results show that
coupled axion models are allowed to have larger deviation from cosmological
constant by the present observational data.


title:
Adsorption of Alkali, Alkaline Earth and Transition Metal Atoms on
  Silicene

abstract:
  The adsorption characteristics of alkali, alkaline earth and transition metal
adatoms on silicene, a graphene-like monolayer structure of silicon, are
analyzed by means of first-principles calculations. In contrast to graphene,
interaction between the metal atoms and the silicene surface is quite strong
due to its highly reactive buckled hexagonal structure. In addition to
structural properties, we also calculate the electronic band dispersion, net
magnetic moment, charge transfer, workfunction and dipole moment of the metal
adsorbed silicene sheets. Alkali metals, Li, Na and K, adsorb to hollow site
without any lattice distortion. As a consequence of the significant charge
transfer from alkalis to silicene metalization of silicene takes place. Trends
directly related to atomic size, adsorption height, workfunction and dipole
moment of the silicene/alkali adatom system are also revealed. We found that
the adsorption of alkaline earth metals on silicene are entirely different from
their adsorption on graphene. The adsorption of Be, Mg and Ca turns silicene
into a narrow gap semiconductor. Adsorption characteristics of eight transition
metals Ti, V, Cr, Mn, Fe, Co, Mo and W are also investigated. As a result of
their partially occupied d orbital, transition metals show diverse structural,
electronic and magnetic properties. Upon the adsorption of transition metals,
depending on the adatom type and atomic radius, the system can exhibit metal,
half-metal and semiconducting behavior. For all metal adsorbates the direction
of the charge transfer is from adsorbate to silicene, because of its high
surface reactivity. Our results indicate that the reactive crystal structure of
silicene provides a rich playground for functionalization at nanoscale.


title: Geometric approach to non-relativistic Quantum Dynamics of mixed states

abstract:
  In this paper we propose a geometrization of the non-relativistic quantum
mechanics for mixed states. Our geometric approach makes use of the Uhlmann's
principal fibre bundle to describe the space of mixed states and as a novelty
tool, to define a dynamic-dependent metric tensor on the principal manifold,
such that the projection of the geodesic flow to the base manifold gives the
temporal evolution predicted by the von Neumann equation. Using that approach
we can describe every conserved quantum observable as a Killing vector field,
and provide a geometric proof for the Poincare quantum recurrence in a physical
system with finite energy levels.


title: Principles of modal and vector theory of formal intelligence systems

abstract:
  The paper considers the class of information systems capable of solving
heuristic problems on basis of formal theory that was termed modal and vector
theory of formal intelligent systems (FIS). The paper justifies the
construction of FIS resolution algorithm, defines the main features of these
systems and proves theorems that underlie the theory. The principle of
representation diversity of FIS construction is formulated. The paper deals
with the main principles of constructing and functioning formal intelligent
system (FIS) on basis of FIS modal and vector theory. The following phenomena
are considered: modular architecture of FIS presentation sub-system, algorithms
of data processing at every step of the stage of creating presentations.
Besides the paper suggests the structure of neural elements, i.e. zone
detectors and processors that are the basis for FIS construction.


title: Ontology Guided Information Extraction from Unstructured Text

abstract:
  In this paper, we describe an approach to populate an existing ontology with
instance information present in the natural language text provided as input. An
ontology is defined as an explicit conceptualization of a shared domain. This
approach starts with a list of relevant domain ontologies created by human
experts, and techniques for identifying the most appropriate ontology to be
extended with information from a given text. Then we demonstrate heuristics to
extract information from the unstructured text and for adding it as structured
information to the selected ontology. This identification of the relevant
ontology is critical, as it is used in identifying relevant information in the
text. We extract information in the form of semantic triples from the text,
guided by the concepts in the ontology. We then convert the extracted
information about the semantic class instances into Resource Description
Framework (RDF3) and append it to the existing domain ontology. This enables us
to perform more precise semantic queries over the semantic triple store thus
created. We have achieved 95% accuracy of information extraction in our
implementation.


title: Device-independent entanglement quantification and related applications

abstract:
  We present a general method to quantify both bipartite and multipartite
entanglement in a device-independent manner, meaning that we put a lower bound
on the amount of entanglement present in a system based on observed data only
but independently of any quantum description of the employed devices. Some of
the bounds we obtain, such as for the Clauser-Horne-Shimony-Holt Bell
inequality or the Svetlichny inequality, are shown to be tight. Besides,
device-independent entanglement quantification can serve as a basis for
numerous tasks. We show in particular that our method provides a rigorous way
to construct dimension witnesses, gives new insights into the question whether
bound entangled states can violate a Bell inequality, and can be used to
construct device independent entanglement witnesses involving an arbitrary
number of parties.


title: An Abelian theorem with application to the conditional Gibbs principle

abstract:
  Let $X_1,...,X_n$ be $n$ independent unbounded real random variables which
have common, roughly speaking, light-tailed type distribution. Denote by
$S_1^n$ their sum and by $\pi^{a_n}$ the tilted density of $X_1$, where $a_n
\rightarrow\infty$ as $n\rightarrow \infty$. An Abelian type theorem is given,
which is used to approximate the first three centered moments of the
distribution $\pi^{a_n}$. Further, we provide the Edgeworth expansion of
$n$-convolution of the normalized tilted density under the setting of a
triangular array of row-wise independent summands, which is then applied to
obtain one local limit theorem conditioned on extreme deviation event
$(S_1^n/n=a_n)$ with $a_n\rightarrow \infty$.


title:
Source Code Analysis to Remove Security Vulnerabilities in Java Socket
  Programs: A Case Study

abstract:
  This paper presents the source code analysis of a file reader server socket
program (connection-oriented sockets) developed in Java, to illustrate the
identification, impact analysis and solutions to remove five important software
security vulnerabilities, which if left unattended could severely impact the
server running the software and also the network hosting the server. The five
vulnerabilities we study in this paper are: (1) Resource Injection, (2) Path
Manipulation, (3) System Information Leak, (4) Denial of Service and (5)
Unreleased Resource vulnerabilities. We analyze the reason why each of these
vulnerabilities occur in the file reader server socket program, discuss the
impact of leaving them unattended in the program, and propose solutions to
remove each of these vulnerabilities from the program. We also analyze any
potential performance tradeoffs (such as increase in code size and loss of
features) that could arise while incorporating the proposed solutions on the
server program. The proposed solutions are very generic in nature, and can be
suitably modified to correct any such vulnerabilities in software developed in
any other programming language. We use the Fortify Source Code Analyzer to
conduct the source code analysis of the file reader server program, implemented
on a Windows XP virtual machine with the standard J2SE v.7 development kit.


title: PGC 60020: a Polar-Ring Galaxy

abstract:
  We present an analysis of new observations of a peculiar galaxy PGC 60020,
obtained with the 6-m BTA telescope of the SAO RAS with a multimode SCORPIO
instrument. The observational data includes direct images in the B, V, Rc
photometric bands and long-slit spectra in the red range (the Ha line spectral
region). Based on the analysis of these data it was found that PGC 60020
belongs to the type of classical polar-ring galaxies. Its main body is an S0
galaxy, around the major axis of which a disk of gas, dust and stars is
rotating in the plane inclined at an angle of about 60 degrees to the galactic
plane. A loop-shaped structure stretches from the southern part of this disk
(possibly, a tidal tail) towards the SDSS J171745.58+404137.1 galaxy.


title:
Representation of spectrums of $C^{\ast}$-algebras of bounded functions
  in terms of filters

abstract:
  Let $X$ be a non-empty set and let $\mathcal{F}$ be any $C^{\ast}$-subalgebra
of $\ell ^{\infty}(X)$ containing the constant functions. We show that the
spectrum of $\mathcal{F}$ can be considered as a space of certain filters
determined by $\mathcal{F}$ on $X$. Furthermore, we show that these filters
describe the topology of the spectrum of $\mathcal{F}$.


title:
Towards experimentally testing the paradox of black hole information
  loss

abstract:
  Information about the collapsed matter in a black hole will be lost if
Hawking radiations are truly thermal. Recent studies discover that information
can be transmitted from a black hole by Hawking radiations, due to their
spectrum deviating from exact thermality when back reaction is considered. In
this paper, we focus on the spectroscopic features of Hawking radiation from a
Schwarzschild black hole, contrasting the differences between the nonthermal
and thermal spectra. Of great interest, we find that the energy covariances of
Hawking radiations for the thermal spectrum are exactly zero, while the energy
covariances are non-trivial for the nonthermal spectrum. Consequently, the
nonthermal spectrum can be distinguished from the thermal one by counting the
energy covariances of successive emissions, which provides an avenue towards
experimentally testing the long-standing "information loss paradox".


title:
Ionization--induced star formation V: Triggering in partially unbound
  clusters

abstract:
  We present the fourth in a series of papers detailing our SPH study of the
effects of ionizing feedback from O--type stars on turbulent star forming
clouds. Here, we study the effects of photoionization on a series of initially
partially unbound clouds with masses ranging from $10^{4}$--$10^{6}$M$_{\odot}$
and initial sizes from 2.5-45pc. We find that ionizing feedback profoundly
affects the structure of the gas in most of our model clouds, creating large
and often well-cleared bubble structures and pillars. However, changes in the
structures of the embedded clusters produced are much weaker and not well
correlated to the evolution of the gas. We find that in all cases, star
formation efficiencies and rates are reduced by feedback and numbers of objects
increased, relative to control simulations. We find that local triggered star
formation does occur and that there is a good correlation between triggered
objects and pillars or bubble walls, but that triggered objects are often
spatially-mixed with those formed spontaneously. Some triggered objects acquire
large enough masses to become ionizing sources themselves, lending support to
the concept of propagating star formation. We find scant evidence for spatial
age gradients in most simulations, and where we do see them, they are not a
good indicator of triggering, as they apply equally to spontaneously-formed
objects as triggered ones. Overall, we conclude that inferring the global or
local effects of feedback on stellar populations from observing a system at a
single epoch is very problematic.


title:
Experimental study of z resolution in acousto-optical coherence
  tomography using random phase jumps on ultrasound and light

abstract:
  Acousto-Optical Coherence Tomography (AOCT) is a variant of Acousto Optic
Imaging (also called Ultrasound modulated Optical Tomography) that makes
possible to get resolution along the ultrasound propagation axis $z$. We
present here new AOCT experimental results, and we study how the $z$ resolution
depends on time step between phase jumps $T_\phi$, or on the correlation length
$\Delta z$. By working at low resolution, we perform a quantitative comparison
of the $z$ measurements with the theoretical Point Spread Function (PSF). We
present also images recorded with different $z$ resolution, and we
qualitatively show how the image quality varies with $T_\phi$, or $\Delta z$.


title: Period Variability of Coupled Noisy Oscillators

abstract:
  Period variability, quantified by the standard deviation (SD) of the
cycle-to-cycle period, is investigated for noisy phase oscillators. We define
the checkpoint phase as the beginning/end point of one oscillation cycle and
derive an expression for the SD as a function of this phase. We find that the
SD is dependent on the checkpoint phase only when oscillators are coupled. The
applicability of our theory is verified using a realistic model. Our work
clarifies the relationship between period variability and synchronization from
which valuable information regarding coupling can be inferred.


title:
Oscillating waves and optimal smoothing effect for one-dimensional
  nonlinear scalar conservation laws

abstract:
  Lions, Perthame, Tadmor conjectured in 1994 an optimal smoothing effect for
entropy solutions of nonlinear scalar conservations laws . In this short paper
we will restrict our attention to the simpler one-dimensional case. First,
supercritical geometric optics lead to sequences of $C^\infty$ solutions
uniformly bounded in the Sobolev space conjectured. Second we give continuous
solutions which belong exactly to the suitable Sobolev space. In order to do so
we give two new definitions of nonlinear flux and we introduce fractional $BV$
spaces.


title:
Connecting Magnetic Towers with Faraday Rotation Gradients in Active
  Galactic Nuclei Jets

abstract:
  The idea that systematic Faraday Rotation gradients across the parsec-scale
jets of AGNs can reveal the presence of helical magnetic (B) fields has been
around since the early 1990s. These gradients are taken to be due to the
systematic variation of the line of sight-B-field across the jet. We present
here the parsec-scale Faraday Rotation distributions for the BL Lac objects
0716+714 and 1749+701, based on polarization data obtained with the Very Long
Baseline Array (VLBA) at two wavelengths near each of the 2cm, 4cm and 6cm
bands (0716+714) and at four wavelengths in the range 18-22 cm (1749+701). The
Rotation Measure (RM) maps for both these sources indicate systematic gradients
across their jets, as expected if these jets have helical B fields. The
significance of these transverse RM gradients is > 3 sigma in all cases. We
present the results of Monte Carlo simulations directly demonstrating the
possibility of observing such transverse RM gradients even if the intrinsic jet
structure is much narrower than the observing beam. We observe an intriguing
new feature in these sources, a reversal in the direction of the gradient in
the jet as compared to the gradient in the core region. This provides new
evidence to support models in which field lines emerging from the central
region of the accretion disk and closing in the outer region of the accretion
disk are both "wound up" by the differential rotation of the disk. The net
observed RM gradient will essentially be the sum effect of two regions of
helical field, one nested inside the other. The direction of the net RM
gradient will be determined by whether the inner or outer helix dominates the
RM integrated through the jet, and RM gradient reversals will be observed if
the inner and outer helical fields dominate in different regions of the jet.
This potentially provides new insights about the overall configuration of the
jet B fields.


title: Interacting dark energy and transient accelerated expansion

abstract:
  We argue that interactions in the dark sector may have a crucial impact on
the cosmological dynamics. In particular, the future cosmic evolution may be
very different from that predicted by the LCDM model. An example is a scenario
in which the currently observed accelerated expansion is an interaction-induced
transient phenomenon. We discuss such type of behavior on the basis of a
two-fluid toy model.


title:
Dynamics during outburst: VLTI observations of the young eruptive star
  V1647 Ori during its 2003-2006 outburst

abstract:
  Context: It is hypothesized that low-mass young stellar objects undergo
eruptive phases during their early evolution. The outburst of V1647 Ori between
2003 and 2006 offered a rare opportunity to investigate such an accretion
event. Aims: By means of our interferometry observing campaign during this
outburst, supplemented by other observations, we investigate the temporal
evolution of the inner circumstellar structure of V1647 Ori We also study the
role of the changing extinction in the brightening of the object and separate
it from the accretional brightening. Methods: We observed V1647 Ori with
MIDI/VLTI at two epochs in this outburst. First, during the slowly fading
plateau phase (2005 March) and second, just before the rapid fading of the
object (2005 September), which ended the outburst. We used the radiative
transfer code MC3D to fit the interferometry data and the spectral energy
distributions from five different epochs at different stages of the outburst.
The comparison of these models allowed us to trace structural changes in the
system on AU-scales. We also considered qualitative alternatives for the
interpretation of our data. Results: We found that the disk and the envelope
are similar to those of non-eruptive young stars and that the accretion rate
varied during the outburst. We also found evidence for the increase of the
inner radii of the circumstellar disk and envelope at the beginning of the
outburst. Furthermore, the change of the interferometric visibilities indicates
structural changes in the circumstellar material. We test a few scenarios to
interpret these data. We also speculate that the changes are caused by the
fading of the central source, which is not immediately followed by the fading
of the outer regions. However, if the delay in the fading of the disk is
responsible for the changes seen in the MIDI data, the effect should be
confirmed by dynamical modeling.


title:
Optimal Power and Rate Allocation in the Degraded Gaussian Relay Channel
  with Energy Harvesting Nodes

abstract:
  Energy Harvesting (EH) is a novel technique to prolong the lifetime of the
wireless networks such as wireless sensor networks or Ad-Hoc networks, by
providing an unlimited source of energy for their nodes. In this sense, it has
emerged as a promising technique for Green Communications, recently. On the
other hand, cooperative communication with the help of relay nodes improves the
performance of wireless communication networks by increasing the system
throughput or the reliability as well as the range and efficient energy
utilization. In order to investigate the cooperation in EH nodes, in this
paper, we consider the problem of optimal power and rate allocation in the
degraded full-duplex Gaussian relay channel in which source and relay can
harvest energy from their environments. We consider the general stochastic
energy arrivals at the source and the relay with known EH times and amounts at
the transmitters before the start of transmission. This problem has a min-max
optimization form that along with the constraints is not easy to solve. We
propose a method based on a mathematical theorem proposed by Terkelsen [1] to
transform it to a solvable convex optimization form. Also, we consider some
special cases for the harvesting profile of the source and the relay nodes and
find their solutions efficiently.


title:
Scattering of antiplane elastic waves by two-dimensional periodic arrays
  of cracks

abstract:
  In the context of elastic wave propagation in damaged solids, an analytical
approach for scattering of antiplane waves by two-dimensional periodic arrays
of cracks is developed. Before considering the study of arrays of cracks, the
scattering of an antiplane wave by a flat crack is first studied. Then, using
the representation formula for the scattered displacement by a flat and by
considering the periodicity condition of the crack-spacing, a boundary integral
equation is obtained for the crack face displacement of the reference crack.
Numerical results for the reflection and transmission coefficients are
presented as functions of the crack-spacing, the frequency of excitation, and
the angle of incidence. Finally, the propagation of antiplane waves by
two-dimensional periodic arrays of cracks is studied. Despite the use of a
finite number of linear arrays, one recognizes the effects of band-pass
filtering or band rejection characteristics of the transmission spectra of a
periodic medium. Effects due to a disorder in the periodicity are also
analysed.


title: Adaptive Sparse Channel Estimation for Time-Variant MIMO-OFDM Systems

abstract:
  Accurate channel state information (CSI) is required for coherent detection
in time-variant multiple-input multipleoutput (MIMO) communication systems
using orthogonal frequency division multiplexing (OFDM) modulation. One of
low-complexity and stable adaptive channel estimation (ACE) approaches is the
normalized least mean square (NLMS)-based ACE. However, it cannot exploit the
inherent sparsity of MIMO channel which is characterized by a few dominant
channel taps. In this paper, we propose two adaptive sparse channel estimation
(ASCE) methods to take advantage of such sparse structure information for
time-variant MIMO-OFDM systems. Unlike traditional NLMS-based method, two
proposed methods are implemented by introducing sparse penalties to the cost
function of NLMS algorithm. Computer simulations confirm obvious performance
advantages of the proposed ASCEs over the traditional ACE.


title: Theory of spin Hall magnetoresistance

abstract:
  We present a theory of the spin Hall magnetoresistance (SMR) in multilayers
made from an insulating ferromagnet F, such as yttrium iron garnet (YIG), and a
normal metal N with spin-orbit interactions, such as platinum (Pt). The SMR is
induced by the simultaneous action of spin Hall and inverse spin Hall effects
and therefore a non-equilibrium proximity phenomenon. We compute the SMR in
F$|$N and F$|$N$|$F layered systems, treating N by spin-diffusion theory with
quantum mechanical boundary conditions at the interfaces in terms of the
spin-mixing conductance. Our results explain the experimentally observed spin
Hall magnetoresistance in N$|$F bilayers. For F$|$N$|$F spin valves we predict
an enhanced SMR amplitude when magnetizations are collinear. The SMR and the
spin-transfer torques in these trilayers can be controlled by the magnetic
configuration.


title:
Adaptive Sparse Channel Estimation for Time-Variant MISO Communication
  Systems

abstract:
  Channel estimation problem is one of the key technical issues in time-variant
multiple-input single-output (MSIO) communication systems. To estimate the MISO
channel, least mean square (LMS) algorithm is applied to adaptive channel
estimation (ACE). Since the MISO channel is often described by sparse channel
model, such sparsity can be exploited and then estimation performance can be
improved by adaptive sparse channel estimation (ASCE) methods using sparse LMS
algorithms. However, conventional ASCE methods have two main drawbacks: 1)
sensitive to random scale of training signal and 2) unstable in low
signal-to-noise ratio (SNR) regime. To overcome these two harmful factors, in
this paper, we propose a novel ASCE method using normalized LMS (NLMS)
algorithm (ASCE-NLMS). In addition, we also proposed an improved ASCE method
using normalized least mean fourth (NLMF) algorithm (ASCE-NLMF). Two proposed
methods can exploit the channel sparsity effectively. Also, stability of the
proposed methods is confirmed by mathematical derivation. Computer simulation
results show that the proposed sparse channel estimation methods can achieve
better estimation performance than conventional methods.


title: Nonlinear Spinor Fields in Bianchi type-I spacetime reexamined

abstract:
  The specific behavior of spinor field in curve space-time with the exception
of FRW model almost always gives rise to non-trivial non-diagonal components of
the energy-momentum tensor. This non-triviality of non-diagonal components of
the energy-momentum tensor imposes some severe restrictions either on the
spinor field or on the metric functions. In this paper within the scope of an
anisotropic Bianchi type-I Universe we study the role of spinor field in the
evolution of the Universe. It is found that there exist two possibilities. In
one scenario the initially anisotropic Universe evolves into an isotropic one
asymptotically, but in this case the spinor field itself undergoes some severe
restrictions. In the second scenario the isotropization takes places almost at
the beginning of the process.


title: Characterizing and Evaluating The Impact of Software Interface Clones

abstract:
  Software Interfaces are meant to describe contracts governing interactions
between logic modules. Interfaces, if well designed, significantly reduce
software complexity and ease maintainability . However, as software evolves,
the organization and the quality of software interfaces gradually deteriorate.
As a consequence, this often leads to increased development cost, lower code
quality and reduced reusability . Code clones are one of the most known bad
smells in source code. This design defect may occur in interfaces by
duplicating method/API declarations in several interfaces. Such interfaces are
similar from the point of view of public services/APIs they specify, thus they
indicate a bad organization of application services. In this paper, we
characterize the interface clone design defect and illustrate it via examples
taken from real-world open source software applications. We conduct an
empirical study covering nine real-world open source software applications to
quantify the presence of interface clones and evaluate their impact on
interface design quality . The results of the empirical study show that
interface clones are widely present in software interfaces. They also show that
the presence of interface clones may cause a degradation of interface cohesion
and indicate a considerable presence of code clones at implementations level.


title:
Lipschitz and uniformly continuous reducibilities on ultrametric Polish
  spaces

abstract:
  We analyze the reducibilities induced by, respectively, uniformly continuous,
Lipschitz, and nonexpansive functions on arbitrary ultrametric Polish spaces,
and determine whether under suitable set-theoretical assumptions the induced
degree-structures are well-behaved.


title:
Consistent Horava gravity without extra modes and equivalent to general
  relativity at the linearized level

abstract:
  We consider a Horava theory that has a consistent structure of constraints
and propagates two physical degrees of freedom. The Lagrangian includes the
terms of Blas, Pujolas and Sibiryakov. The theory can be obtained from the
general Horava's formulation by setting lambda = 1/3. This value of lambda is
protected in the quantum formulation of the theory by the presence of a
constraint. The theory has two second-class constraints that are absent for
other values of lambda. They remove the extra scalar mode. There is no
strong-coupling problem in this theory since there is no extra mode. We perform
explicit computations on a model that put together a z = 1 term and the IR
effective action. We also show that the lowest-order perturbative version of
the IR effective theory has a dynamics identical to the one of linearized
general relativity. Therefore, this theory is smoothly recovered at the deepest
IR without discontinuities in the physical degrees of freedom.


title:
Sparse Channel Estimation for MIMO-OFDM Amplify-and-Forward Two-Way
  Relay Networks

abstract:
  Accurate channel impulse response (CIR) is required for coherent detection
and it can also help improve communication quality of service in
next-generation wireless communication systems. One of the advanced systems is
multi-input multi-output orthogonal frequency-division multiplexing (MIMO-OFDM)
amplify and forward two-way relay networks (AF-TWRN). Linear channel estimation
methods, e.g., least square (LS), have been proposed to estimate the CIR.
However, these methods never take advantage of channel sparsity and then cause
performance loss. In this paper, we propose a sparse channel estimation method
to exploit the sparse structure information in the CIR at each end user. Sparse
channel estimation problem is formulated as compressed sensing (CS) using
sparse decomposition theory and the estimation process is implemented by LASSO
algorithm. Computer simulation results are given to confirm the superiority of
proposed method over the LS-based channel estimation method.


title:
High Fidelity Teleportation of Continuous Variable Quantum States using
  Delocalized Single Photons

abstract:
  Traditional continuous variable teleportation can only approach unit fidelity
in the limit of an infinite (and unphysical) amount of squeezing. We describe a
new method for continuous variable teleportation that approaches unit fidelity
with finite resources. The protocol is not based on squeezed states as in
traditional teleportation but on an ensemble of single photon entangled states.
We characterize the teleportation scheme with coherent states, Schrodinger cat
states and two-mode squeezed state and we find several situations in which
near-unity teleportation fidelity can be obtained with modest resources.


title:
Quantitative Determination of the Band-Gap of WS2 with Ambipolar Ionic
  Liquid-Gated Transistors

abstract:
  We realized ambipolar Field-Effect Transistors by coupling exfoliated thin
flakes of tungsten disulphide (WS2) with an ionic liquid-dielectric. The
devices show ideal electrical characteristics, including very steep
sub-threshold slopes for both electrons and holes and extremely low OFF-state
currents. Thanks to these ideal characteristics, we determine with high
precision the size of the band-gap of WS2 directly from the gate-voltage
dependence of the source-drain current. Our results demonstrate how a careful
use of ionic liquid dielectrics offers a powerful strategy to study
quantitatively the electronic properties of nano-scale materials.


title: Exact expression for the number of states in lattice models

abstract:
  We derive a closed-form combinatorial expression for the number of states in
canonical systems with discrete energy levels. The expression results from the
exact low-temperature power series expansion of the partition function. The
approach provides interesting insights into basis of statistical mechanics. In
particular, it is shown that in some cases the logarithm of the partition
function may be considered the generating function for the number of internal
states of energy clusters, which characterize system's microscopic
configurations. Apart from elementary examples including the Poisson, geometric
and negative binomial probability distributions for the energy, the framework
is also validated against the one-dimensional Ising model.


title: Complex oscillatory yielding of model hard sphere glasses

abstract:
  The yielding behaviour of hard sphere glasses under large amplitude
oscillatory shear has been studied by probing the interplay of Brownian motion
and shear-induced diffusion at varying oscillation frequencies. Stress,
structure and dynamics are followed by experimental rheology and Browian
Dynamics simulations. Brownian motion assisted cage escape dominates at low
frequencies while escape through shear-induced collisions at high ones, both
related with a yielding peak in\ $G^{\prime \prime}$. At intermediate
frequencies a novel, for HS glasses, double peak in $G^{\prime \prime}$ is
revealed reflecting both mechanisms. At high frequencies and strain amplitudes
a persistent structural anisotropy causes a stress drop within the cycle after
strain reversal, while higher stress harmonics are minimized at certain strain
amplitudes indicating an apparent harmonic response.


title:
The interaction-driven starburst contribution to the cosmic star
  formation rate density

abstract:
  An increasing amount of observational evidence supports the notion that there
are two modes of star formation: a quiescent mode in disk-like galaxies, and a
starburst mode, which is generally interpreted as driven by merging. Using a
semi-analytic model of galaxy formation, we derive the relative contribution to
the cosmic star formation rate density of quiescently starforming and starburst
galaxies, predicted under the assumption that starburst events are triggered by
galaxy encounters (merging and fly-by kind) during their merging histories. We
show that, within this framework, quiescently starforming galaxies dominate the
cosmic star formation rate density at all redshifts. The contribution of the
burst-dominated starforming galaxies increases with redshift, rising from <5%
at low redshift (z<0.1) to ~20% at z>5. We estimated that the fraction of the
final (z=0) galaxy stellar mass which is formed through the burst component of
star formation is ~10% for 10^10 M_\odot<M_*<10^11.5 M_\odot. Starburst
galaxies, selected according to their distance from the galaxy main sequence,
account for ~10% of the star formation rate density in the redshift interval
1.5<z<2.5, i.e. at the cosmic peak of the star formation activity.


title: p-wave superconductivity near a transverse saturation field

abstract:
  We investigate reentrant superconductivity in an Ising ferromagnetic
superconductor URhGe under a transverse magnetic field h_x. The superconducting
transition temperature for p-wave order parameters T_{sc} is calculated and
shows two domes as a function of h_x. We find strong enhancement of T_{sc} in
the high-field dome near a saturation field h_s where the spins align in the
transverse direction. Soft magnons generate strong attractive interactions
there. Spin components of the pairing show a significant change between h_x<h_s
and h_x>h_s. We also discuss the appearance of superconductivity with zero-spin
pair due to cancellation between external and exchange fields.


title: Polarisation of electroweak gauge bosons at the LHC

abstract:
  We present results for the polarisation of gauge bosons produced at the LHC.
Polarisation effects for W bosons manifest themselves in the angular
distributions of the lepton and in the distributions of lepton transverse
momentum and missing transverse energy. The polarisation is discussed for a
range of different processes producing W bosons such as W+jets and W from top
production. The relative contributions of the different polarisation states
vary from process to process, reflecting the dynamics of the underlying
hard-scattering process. We also calculate the polarisation of the Z boson
produced in association with QCD jets at the LHC.


title: Quasar host galaxies in the SDSS Stripe 82

abstract:
  We present first results from our study of the properties of ~400 low
redshift (z < 0.5) quasars, based on a large homogeneous dataset derived from
the Stripe 82 area of the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7).
For this sky region, deep (r~22.4) u,g,r,i,z images are available, up to ~2 mag
deeper than standard SDSS images, allowing us to study both the host galaxies
and the Mpc-scale environments of the quasars. This sample greatly outnumbers
previous studies of low redshift quasar hosts, from the ground or from space.
Here we report the preliminary results for the quasar host galaxies. We are
able to resolve the host galaxy in ~80 % of the quasars. The quasar hosts are
luminous and large, the majority of them in the range between M*-1 and M*-2,
and with ~10 kpc galaxy scale-lengths. Almost half of the host galaxies are
best fit with an exponential disk, while the rest are spheroid-dominated. There
is a reasonable relation between the central black hole mass and the host
galaxy luminosity.


title:
Dixmier traces and extrapolation description of noncommutative Lorentz
  spaces

abstract:
  We study the relationships between Dixmier traces, zeta-functions and traces
of heat semigroups beyond the dual of the Macaev ideal and in the general
context of semifinite von Neumann algebras. We show that the correct framework
for this investigation is that of operator Lorentz spaces possessing an
extrapolation description. We demonstrate the applicability of our results to
H\"ormander-Weyl pseudo-differential calculus. In that context, we prove that
the Dixmier trace of a pseudo-differential operator coincide with the `Dixmier
integral' of its symbol.


title: On the finitizability problem in algebraic logic; recent results

abstract:
  This is a survey article in algebraic logic, where we take a magical tour
from old concepts due to Henkin, Monk and Tarski like neat embeddings, to
modern views and perspectives, culminating in the use of Erdos graphs in
settling important questions in algebraic logic.


title:
Key User Extraction Based on Telecommunication Data (aka. Key Users in
  Social Network. How to find them?)

abstract:
  The number of systems that collect vast amount of data about users rapidly
grow during last few years. Many of these systems contain data not only about
people characteristics but also about their relationships with other system
users. From this kind of data it is possible to extract a social network that
reflects the connections between system's users. Moreover, the analysis of such
social network enables to investigate different characteristics of its members
and their linkages. One of the types of examining such network is key users
extraction. Key users are these who have the biggest impact on other network
members as well as have big influence on network evolution. The obtained about
these users knowledge enables to investigate and predict changes within the
network. So this knowledge is very important for the people or companies who
make a profit from the network like telecommunication company. The second
important thing is the ability to extract these users as quick as possible,
i.e. developed the algorithm that will be time-effective in large social
networks where number of nodes and edges equal few millions. In this master
thesis the method of key user extraction, which is called social position, was
analyzed. Moreover, social position measure was compared with other methods,
which are used to assess the centrality of a node. Furthermore, three
algorithms used to social position calculation was introduced along with
results of comparison between their processing time and others centrality
methods.


title:
Octant sensitivity for large theta(13) in atmospheric and long baseline
  neutrino experiments

abstract:
  One of the unknown parameters in neutrino oscillations is the octant of the
mixing angle theta_{23}. In this paper, we discuss the possibility of
determining the octant of theta_{23} in the long baseline experiments T2K and
NOvA in conjunction with future atmospheric neutrino detectors, in light of
non-zero value of theta_{13} measured by reactor experiments. We consider two
detector technologies for atmospheric neutrinos - magnetized iron calorimeter
and non-magnetized Liquid Argon Time Projection Chamber. We present the octant
sensitivity for T2K/NOvA and atmospheric neutrino experiments separately as
well as combined. For the long baseline experiments, a precise measurement of
theta_{13}, which can exclude degenerate solutions in the wrong octant,
increases the sensitivity drastically. For theta_{23} = 39^o and sin^2 2
theta_{13} = 0.1, at least ~2 sigma sensitivity can be achieved by T2K+NOvA for
all values of delta_{CP} for both normal and inverted hierarchy. For
atmospheric neutrinos, the moderately large value of theta_{13} measured in the
reactor experiments is conducive to octant sensitivity because of enhanced
matter effects. A magnetized iron detector can give a 2 sigma octant
sensitivity for 500 kT yr exposure for theta_{23} = 39^o, delta_{CP} = 0 and
normal hierarchy. This increases to 3 sigma for both hierarchies by combining
with T2K+NOvA. This is due to a preference of different theta_{23} values at
the minimum chi^2 by T2K/NOvA and atmospheric neutrino experiments. A Liquid
Argon detector for atmospheric neutrinos with the same exposure can give higher
octant sensitivity, due to the interplay of muon and electron contributions and
superior resolutions. We obtain a ~3 sigma sensitivity for theta_{23} = 39^o
for normal hierarchy. This increases to > ~4 sigma for all values of delta_{CP}
if combined with T2K+NOvA. For inverted hierarchy the combined sensitivity is
~3 sigma.


title:
Reclassification of the nearest quasar pair candidate: SDSS J15244+3032
  - RXS J15244+3032

abstract:
  We present optical spectroscopy of the nearest quasar pair listed in the 13th
edition of the Veron-Cetty & Veron catalogue, i.e. the two quasars SDSS
J15244+3032 and RXS J15244+3032 (redshift z~0.27, angular separation ~7 arcsec,
and line-of-sight velocity difference ~1900 km/s). This system would be an
optimal candidate to investigate the mutual interaction of the host galaxies
with ground based optical imaging and spectroscopy. However, new optical data
demonstrate that RXS J15244+3032 is indeed a star of spectral type G.
  This paper includes data gathered with the Asiago 1.82m telescope (Cima Ekar
Observatory, Asiago, Italy).


title: Non-universal shot noise in quasiequilibrium spin valves

abstract:
  We show that the breakdown of the Wiedemann-Franz law due to
electron--electron scattering in diffusive spin valves may result in a strong
suppression of the Fano factor that describes the ratio between shot noise and
average current. In the parallel configuration of magnetizations, we find the
universal value $\sqrt{3}/4$ in the absence of a normal-metal spacer layer, but
including the spacer leads to a non-monotonous suppression of this value before
reaching back to the universal value for large spacer lengths. On the other
hand, in the case of an antiparallel configuration with a negligibly small
spacer, the Fano factor is $\sqrt{3 (1-P^2)}/4$, where $P$ denotes the
polarization of the conductivities. For $P\rightarrow \pm 1$, the current
through the system is almost noiseless.


title: Quark Confinement from Correlation Functions

abstract:
  We study quark confinement by computing the Polyakov loop potential in
Yang--Mills theory within different non-perturbative functional continuum
approaches [1]. We extend previous studies in the formalism of the functional
renormalisation group and complement those with findings from Dyson--Schwinger
equations and two-particle-irreducible functionals. These methods are
formulated in terms of low order Green functions. This allows to identify a
criterion for confinement solely in terms of the low-momentum behaviour of
correlators.


title: Peaks and jumps reconstruction with B-splines scaling functions

abstract:
  We consider a methodology based in B-splines scaling functions to numerically
invert Fourier or Laplace transforms of functions in the space
$L^2(\mathbb{R})$. The original function is approximated by a finite
combination of $j^{th}$ order B-splines basis functions and we provide
analytical expressions for the recovered coefficients. The methodology is
particularly well suited when the original function or its derivatives present
peaks or jumps due to discontinuities in the domain. We will show in the
numerical experiments the robustness and accuracy of the method.


title: Experiments on autonomous Boolean networks

abstract:
  We realize autonomous Boolean networks by using logic gates in their
autonomous mode-of-operation on a field-programmable gate array. This allows us
to implement time-continuous systems with complex dynamical behaviors that can
be conveniently interconnected into large-scale networks with flexible
topologies that consist of time-delay links and a large number of nodes. We
demonstrate how we realize networks with periodic, chaotic, and excitable
dynamics and study their properties. Field-programmable gate arrays define a
new experimental paradigm that holds great potential to test a large body of
theoretical results on the dynamics of complex networks, which has been beyond
reach of traditional experimental approaches.


title: Extended Bose-Hubbard model with pair hopping on the triangular lattice

abstract:
  We study systematically an extended Bose-Hubbard model on the triangular
lattice by means of a meanfield method based on the Gutzwiller ansatz. Pair
hopping terms are explicitly included and a three-body constraint is applied.
The ground-state phase diagram and a variety of quantum phase transitions are
investigated in great detail. In particular, we show the existence and
stability of the pair supersolid phase.


title:
Shock creation and Painlev\'{e} property of colliding peakons in the
  Degasperis-Procesi Equation

abstract:
  The Degasperis-Procesi equation (DP) is one of several equations known to
model important nonlinear effects such as wave breaking and shock creation. It
is, however, a special property of the DP equation that these two effects can
be studied in an explicit way with the help of the multipeakon ansatz. In
essence this ansatz allows one to model wave breaking as a collision of
hypothetical particles (peakons and antipeakons), called henceforth
collectively multipeakons. It is shown that DP multipeakons have Painlev\'{e}
property which implies a universal wave breaking behaviour, that multipeakons
can collide only in pairs, and that there are no multiple collisions other
than, possibly simultaneous, collisions of peakon-antipeakon pairs at different
locations. Moreover, it is demonstrated that each peakon-antipeakon collision
results in creation of a shock thus making possible a multi shock phenomenon.


title:
Response to Comment on `Undamped electrostatic plasma waves' [Phys.
  Plasmas 19, 092103 (2012)]

abstract:
  Numerical and experimental evidence is given for the occurrence of the
plateau states and concomitant corner modes proposed in \cite{valentini12}. It
is argued that these states provide a better description of reality for small
amplitude off-dispersion disturbances than the conventional
Bernstein-Greene-Kruskal or cnoidal states such as those proposed in
\cite{comment}


title:
GAMA/H-ATLAS: The Dust Opacity - Stellar Mass Surface Density Relation
  for Spiral Galaxies

abstract:
  We report the discovery of a well-defined correlation between B-band face-on
central optical depth due to dust, \tau^f_B, and the stellar mass surface
density, \mu_{*}, of nearby (z < 0.13) spiral galaxies: log(\tau^f_B) =
1.12(+-0.11)log(\mu_{*}/M_sol kpc^2)-8.6(+-0.8). This relation was derived from
a sample of spiral galaxies taken from the Galaxy and Mass Assembly (GAMA)
survey and detected in the FIR/submm in the Herschel-ATLAS survey. Using a
quantitative analysis of the NUV attenuation-inclination relation for complete
samples of GAMA spirals categorized according to \mu_{*} we demonstrate that
this correlation can be used to statistically correct for dust attenuation
purely on the basis of optical photometry and S'ersic-profile morphological
fits. Considered together with previously established empirical relationships
between stellar mass, metallicity and gas mass, the near linearity and high
constant of proportionality of the \tau^f_B-\mu_{*} relation disfavors a
stellar origin for the bulk of refractory grains in spiral galaxies, instead
being consistent with the existence of a ubiquitous and very rapid mechanism
for the growth of dust in the ISM. We use the \tau^f_B-\mu_{*} relation in
conjunction with the radiation transfer model for spiral galaxies of Popescu &
Tuffs (2011) to derive intrinsic scaling relations between specific star
formation rate (sSFR), stellar mass, and \mu_{*}, in which the attenuation of
the UV light used to measure the SFR is corrected on an object-to-object basis.
A marked reduction in scatter in these relations is achieved which is
demonstrably due to correction of both the inclination-dependent and face-on
components of attenuation. Our results are consistent with a picture of spiral
galaxies in which most of the submm emission originates from grains residing in
translucent structures, exposed to UV in the diffuse interstellar radiation
field.


title: Towards the Rapid Development of a Natural Language Understanding Module

abstract:
  When developing a conversational agent, there is often an urgent need to have
a prototype available in order to test the application with real users. A
Wizard of Oz is a possibility, but sometimes the agent should be simply
deployed in the environment where it will be used. Here, the agent should be
able to capture as many interactions as possible and to understand how people
react to failure. In this paper, we focus on the rapid development of a natural
language understanding module by non experts. Our approach follows the learning
paradigm and sees the process of understanding natural language as a
classification problem. We test our module with a conversational agent that
answers questions in the art domain. Moreover, we show how our approach can be
used by a natural language interface to a cinema database.


title: Tensor products of valued fields

abstract:
  We give a short argument why the tensor product valuation on $K \otimes_k L$
is multiplicative when $k$ is an algebraically closed valued field and $K$ and
$L$ are valued extensions (all valuations being in $\bR$). When the valuation
on $k$ is non trivial we use the fact that $ACVF$, the theory of algebraically
closed (non trivially) valued fields, has quantifier elimination.


title:
Test Sensitivity in the Computer-Aided Detection of Breast Cancer from
  Clinical Mammographic Screening: a Meta-analysis

abstract:
  Objectives: To assess evaluative methodologies for comparative measurements
of test sensitivity in clinical mammographic screening trials of computer-aided
detection (CAD) technologies. Materials and Methods: This meta-analysis was
performed by analytically reviewing the relevant literature on the clinical
application of computer-aided detection (CAD) technologies as part of a breast
cancer screening program based on x-ray mammography. Each clinical study's
method for measuring the CAD system's improvement in test sensitivity is
examined in this meta-analysis. The impact of the chosen sensitivity
measurement on the study's conclusions are analyzed. Results: This
meta-analysis demonstrates that some studies have inappropriately compared
sensitivity measurements between control groups and CAD enabled groups. The
inappropriate comparison of control groups and CAD enabled groups can lead to
an underestimation of the benefits of the clinical application of
computer-aided detection technologies. Conclusions: The potential for the
sensitivity measurement issues raised in this meta-analysis to alter the
conclusions of multiple existing large clinical studies is discussed. Two large
scale studies are substantially affected by the analysis provided in this study
and this meta-analysis demonstrates that computer-aided detection systems are
successfully assisting in the breast cancer screening process.


title:
Orlov's Equivalence and Maximal Cohen-Macaulay Modules over the Cone of
  an Elliptic Curve

abstract:
  We describe a method for doing computations with Orlov's equivalence between
the bounded derived category of certain hypersurfaces and the stable category
of graded matrix factorisations of the polynomials describing these
hypersurfaces. In the case of a smooth elliptic curve over an algebraically
closed field we describe the indecomposable graded matrix factorisations of
rank one. Since every indecomposable Maximal Cohen-Macaulay module over the
completion of a smooth cubic curve is gradable, we obtain explicit descriptions
of all indecomposable rank one matrix factorisations of such potentials.
Finally, we explain how to compute all indecomposable matrix factorisations of
higher rank with the help of a computer algebra system.


title:
A uniform upper bound for the character degree sums and
  Gelfand-Graev-like characters for finite simple groups

abstract:
  Let G be a finite non-abelian simple group and let p be a prime. We classify
all pairs (G,p) such that the sum of the complex irreducible character degrees
of G is greater than the index of a Sylow p-subgroup of G. Our classification
includes all groups of Lie type in defining characteristic p (because every
Gelfand-Graev character of G is multiplicity free and has degree equal to the
above index), and a handful of well-described examples.


title: Graphene as a Prototype Crystalline Membrane

abstract:
  The understanding of the structural and thermal properties of membranes,
low-dimensional flexible systems in a space of higher dimension, is pursued in
many fields from string theory to chemistry and biology. The case of a
two-dimensional (2D) membrane in three dimensions is the relevant one for
dealing with real materials. Traditionally, membranes are primarily discussed
in the context of biological membranes and soft matter in general. The
complexity of these systems hindered a realistic description of their
interatomic structures based on a truly microscopic approach. Therefore,
theories of membranes were developed mostly within phenomenological models.
From the point of view of statistical mechanics, membranes at finite
temperature are systems governed by interacting long-range fluctuations.
Graphene, the first truly two-dimensional system consisting of just one layer
of carbon atoms, provides a model system for the development of a microscopic
description of membranes. In this Account, we review key results in the
microscopic theory of structural and thermal properties of graphene and compare
them with the predictions of phenomenological theories. The two approaches are
in good agreement for the various scaling properties of correlation functions
of atomic displacements. However, some other properties, such as the
temperature dependence of the bending rigidity, cannot be understood based on
phenomenological approaches. We also consider graphene at very high temperature
and compare the results with existing models for two-dimensional melting. The
melting of graphene presents a different scenario, and we describe that process
as the decomposition of the graphene layer into entangled carbon chains.


title: Homometric sets in trees

abstract:
  Let $G = (V,E)$ denote a simple graph with the vertex set $V$ and the edge
set $E$. The profile of a vertex set $V'\subseteq V$ denotes the multiset of
pairwise distances between the vertices of $V'$. Two disjoint subsets of $V$
are \emph{homometric}, if their profiles are the same. If $G$ is a tree on $n$
vertices we prove that its vertex sets contains a pair of disjoint homometric
subsets of size at least $\sqrt{n/2} - 1$. Previously it was known that such a
pair of size at least roughly $n^{1/3}$ exists. We get a better result in case
of haircomb trees, in which we are able to find a pair of disjoint homometric
sets of size at least $cn^{2/3}$ for a constant $c > 0$.


title: Interpreting the observed UV continuum slopes of high-redshift galaxies

abstract:
  The observed UV continuum slope of star forming galaxies is strongly affected
by the presence of dust. Its observation is then a potentially valuable
diagnostic of dust attenuation, particularly at high-redshift where other
diagnostics are currently inaccesible. Interpreting the observed UV continuum
slope in the context of dust attenuation is often achieved assuming the
empirically calibrated Meurer et al. (1999) relation. Implicit in this relation
is the assumption of an intrinsic UV continuum slope ($\beta=-2.23$). However,
results from numerical simulations suggest that the intrinsic UV continuum
slopes of high-redshift star forming galaxies are bluer than this, and moreover
vary with redshift. Using values of the intrinsic slope predicted by numerical
models of galaxy formation combined with a Calzetti et al. (2000) reddening law
we infer UV attenuations ($A_{1500}$) $0.35-0.5\,{\rm mag}$ ($A_{V}$:
$0.14-0.2\,{\rm mag}$ assuming Calzetti et al. 2000) greater than simply
assuming the Meurer relation. This has significant implications for the
inferred amount of dust attenuation at very-high ($z\approx 7$) redshift given
current observational constraints on $\beta$, combined with the Meurer
relation, suggest dust attenuation to be virtually zero in all but the most
luminous systems.


title:
In situ X-ray photoelectron spectroscopy of model catalysts: At the edge
  of the gap

abstract:
  We present a High-Pressure X-ray Photoelectron Spectroscopy (HP-XPS) and
first-principles kinetic Monte Carlo study addressing the nature of the active
surface in CO oxidation over Pd(100). Simultaneously measuring the chemical
composition at the surface and in the near-surface gas-phase, we reveal both
O-covered pristine Pd(100) and a surface oxide as stable, highly active phases
in the near-ambient regime accessible to HP-XPS. Surprisingly, no adsorbed CO
can be detected during high CO2 production rates, which can be explained by a
combination of a remarkably short residence time of the CO molecule on the
surface and mass-transfer limitations in the present set-up.


title: Hydrogen-loosing planets in transition discs around young protostars

abstract:
  We point out that protoplanets created in the framework of the Tidal
Downsizing (TD) theory for planet formation play a very important role for the
evolution of accretion discs hosting them. Since all TD protoplanets are
initially as massive as $\sim 10$ Jupiter masses, they are able to open very
deep gaps in their discs, and even completely isolate the inner disc flows from
the outer ones. Furthermore, in contrast to other planet formation theories, TD
protoplanets are mass donors for their protostars. One potentially observable
signature of planets being devoured by their protostars are FU Ori like
outbursts, and episodic protostar accretion more generally, as discussed by a
number of authors recently.
  Here we explore another observational implication of TD hypothesis: dust poor
inner accretion flows, which we believe may be relevant to some of the observed
mm-bright transitional discs around protostars. In our model, a massive
protoplanet interrupts the flow of the outer dust-rich disc on its protostar,
and at the same time looses a part of its dust-poor envelope into the inner
disc. This then powers the observed gas-but-no-dust accretion onto the star.
Upon a more detailed investigation, we find that this scenario is quite natural
for young massive discs but is less so for older discs, e.g., those whose
self-gravitating phase has terminated a fraction of a Million year or more ago.
This stems from the fact that TD protoplanets of such an age should have
contracted significantly, and so are unlikely to loose much mass. Therefore, we
conclude that either (i) the population of "transition discs" with large holes
and dust-poor accretion is much younger than generally believed; or (ii) there
is a poorly understood stage for late removal of dust-poor envelopes from TD
planets; (iii) another explanation for the observations is correct.


title: MGSim - Simulation tools for multi-core processor architectures

abstract:
  MGSim is an open source discrete event simulator for on-chip hardware
components, developed at the University of Amsterdam. It is intended to be a
research and teaching vehicle to study the fine-grained hardware/software
interactions on many-core and hardware multithreaded processors. It includes
support for core models with different instruction sets, a configurable
multi-core interconnect, multiple configurable cache and memory models, a
dedicated I/O subsystem, and comprehensive monitoring and interaction
facilities. The default model configuration shipped with MGSim implements
Microgrids, a many-core architecture with hardware concurrency management.
MGSim is furthermore written mostly in C++ and uses object classes to represent
chip components. It is optimized for architecture models that can be described
as process networks.


title: Tunneling Hamiltonian

abstract:
  For the description of the transport of electrons across a quantum dot, which
is tunnel coupled to leads at different chemical potentials, it is usual to
assume that the total Hamiltonian of the composite system of the leads and the
quantum dot is the sum of three contributions: That of the leads
(noninteracting electrons), that of the quantum dot and a third one, the
"tunneling Hamiltonian", which reflects the possibility that electrons can move
from the leads to the quantum dot or vice versa. The text aims at a
mathematically clear derivation of such a separation. I will start the
discussion with the total Hamiltonian of the system acting on a many-electron
wave function, including the attractive interaction between nuclei and
electrons as well as the repulsive Coulomb-interaction between different
electrons. Indeed, a natural separation of the total Hamiltonian in the
described form will be obtained. An analysis of the tunneling Hamiltonian shows
that the electron-electron interaction yields contributions to it which
represent the correlated tunneling of two electrons at the same time. For the
derivations it was useful to introduce a map called "antisymmetric product". In
an appendix I show possible exact representations of the total Hamiltonian
(with arbitrary potential V(r)) obtained by the use of the antisymmetric
product.


title: On the cohomology of weakly almost periodic group representations

abstract:
  We initiate a study of cohomological aspects of weakly almost periodic group
representations on Banach spaces, in particular, isometric representations on
reflexive Banach spaces. Using the Ryll-Nardzewski fixed point Theorem, we
prove a vanishing result for the restriction map (with respect to a subgroup)
in the reduced cohomology of weakly periodic representations. Combined with the
Alaoglu-Birkhoff decomposition theorem, this generalizes and complements
theorems on continuous group cohomology by several authors.


title:
Semantic integration process of business components to support
  information system designers

abstract:
  The present work is inscribed within the intersection of two scientific
thematic: the engineering by reuse of components and ontologies alignment. The
integration of Business Components (BC) is a research problem that has been
identified in the field of engineering by reuse. Our proposal aims to provide
assistance to designers of information systems in the integration phase. It is
a process guided by domain ontology to provide semantic integration of BC. This
process allows the detection and resolution of semantic conflicts naming type
encountered in the process of integration of BC.


title: The time-asymmetric quantum state exchange mechanism

abstract:
  We show here that due to non-adiabatic couplings in decaying systems applying
the same time-dependent protocol in the forward and reverse direction to the
same mixed initial state leads to different final pure states. In particular,
in laser driven molecular systems applying a specifically chosen positively
chirped laser pulse or an equivalent negatively chirped laser pulse yields
entirely different final vibrational states. This phenomenon occurs when the
laser frequency and intensity are slowly varied around an exceptional point
(EP) in the laser intensity and frequency parameter space where the
non-hermitian spectrum of the problem is degenerate. The protocol implies that
a positively chirped laser pulse traces a counter-clockwise loop in time in the
laser parameters' space whereas a negatively chirped pulse follows the same
loop in the clockwise direction. According to this protocol one can choose the
final pure state from any initial state. The obtained results imply the
intrinsic non-adiabaticity of quantum transport around an EP, and offer a way
to observe the EP experimentally in time-dependent quantum systems.


title: ZFITTER 1985-2013

abstract:
  The ZFITTER project is aimed at the computation of high-precision theoretical
predictions for various observables in high-energy electron-positron
annihilation and other processes. The stages of the project development are
described. Accent is made on applications to the analysis of LEP data. The
present status of the project and perspectives are given as well.


title:
Finite Horizon Adaptive Optimal Distributed Power Allocation for
  Enhanced Cognitive Radio Network in the Presence of Channel Uncertainties

abstract:
  In this paper, novel enhanced Cognitive Radio Network is considered by using
power control where secondary users are allowed to use wireless resources of
the primary users when primary users are deactivated, but also allow secondary
users to coexist with primary users while primary users are activated by
managing interference caused from secondary users to primary users. Therefore,
a novel finite horizon adaptive optimal distributed power allocation scheme is
proposed by incorporating the effect of channel uncertainties for enhanced
cognitive radio network in the presence of wireless channel uncertainties under
two cases. In Case 1, proposed scheme can force the Signal-to-interference
(SIR) of the secondary users to converge to a higher target value for
increasing network throughput when primary users' are not communicating within
finite horizon. Once primary users are activated as in the Case 2, proposed
scheme can not only force the SIR of primary users to converge to a higher
target SIR, but also force the SIR of secondary users to converge to a lower
value for regulating their interference to Pus during finite time period. In
order to mitigate the attenuation of SIR due to channel uncertainties the
proposed novel finite horizon adaptive optimal distributed power allocation
allows the SIR of both primary users' and secondary users' to converge to a
desired target SIR while minimizing the energy consumption within finite
horizon. Simulation results illustrate that this novel finite horizon adaptive
optimal distributed power allocation scheme can converge much faster and cost
less energy than others by adapting to the channel variations optimally.


title: The AGN phenomenon: open issues

abstract:
  The aim of this short paper is to motivate and encourage research in the
field of Active Galactic Nuclei (AGN). Here we summarize the main open
questions concerning the central engine. Is the central black hole rapidly
spinning and can we prove this? What is the dominant accretion mechanism in
AGN? Why do some AGN form jets while others don't and how do the jets
originate? What keeps jets collimated out to distances of 100 kpc? Is the
emission of blazars dominated rather by synchrotron self-Compton or by external
Compton processes? Which parameters are important in the unified model? We
outline the status of related research, formulate the questions and try to hint
at research projects able to tackle these fundamental topics. Deep surveys,
polarization measurements, improved models, faster and more accurate
simulations as well as bridging the gap in the MeV range can be part of the
tools to bring us closer to an understanding of AGN.


title: Special prime Fano fourfolds of degree 10 and index 2

abstract:
  Mukai proved that most prime Fano fourfolds of degree 10 and index 2 are
contained in a Grassmannian G(2,5). They are all unirational and some are
rational, as remarked by Roth in 1949. We show that their middle cohomology is
of K3 type and that their period map is dominant, with smooth 4-dimensional
fibers, onto a 20-dimensional bounded symmetric period domain of type IV.
Following Hassett, we say that such a fourfold is special if it contains a
surface whose cohomology class does not come from the Grassmannian G(2,5).
Special fourfolds correspond to a countable union of hypersurfaces in the
period domain, labelled by a positive integer d, the discriminant. We describe
special fourfolds for some low values of d. We also characterize those integers
d for which special fourfolds do exist.


title: Black holes and the positive cosmological constant

abstract:
  We address some aspects of black hole spacetimes endowed with a positive
cosmological constant, i.e. black holes located inside a cosmological event
horizon. First we establish a general criterion for existence of cosmological
event horizons. Using the geometrical set up built for this, we study classical
black hole no hair theorems for both static and stationary axisymmetric
spacetimes. We discuss cosmic Nielsen-Olesen strings as hair in
Schwarzschild-de Sitter spacetime. We also give a general calculation for
particle creation by a Killing horizon using complex path analysis and using
this we study particle creation in Schwarzschild-de Sitter spacetime by both
black hole and the cosmological event horizons.


title:
A new greedy randomized adaptive search procedure for multiobjective RNA
  structural alignment

abstract:
  RNA secondary structures prediction is one of the main issues in
bioinformatics. It seeks to elucidate structural conserved regions within a set
of RNA sequences. Unfortunately, finding an accurate conserved structure is a
very hard task to do. Within the present study, the prediction problem is
considered as a multiobjective optimization process in which the structural
conservation and the sensitivity of the multiple alignment are optimized. The
proposed method called GRASPMORSA is based on an aggregate function and GRASP
procedure. The initial solutions are obtained by using a random progressive
local/ global algorithm, and then they are refined by an iterative realignment.
Experiments within a large scale of data have shown the efficacy and
effectiveness of the proposed method and its capacity to reach good quality
solutions.


title: On transparent boundary conditions for the high--order heat equation

abstract:
  In this paper we develop an artificial initial boundary value problem for the
high-order heat equation in a bounded domain $\Omega$. It is found an unique
classical solution of this problem in an explicit form and shown that the
solution of the artificial initial boundary value problem is equal to the
solution of the infinite problem (Cauchy problem) in $\Omega$.


title: Clique cycle-transversals in distance-hereditary graphs

abstract:
  A cycle-transversal of a graph G is a subset T of V(G) such that T intersects
every cycle of G. A clique cycle-transversal, or cct for short, is a
cycle-transversal which is a clique. Recognizing graphs which admit a cct can
be done in polynomial time; however, no structural characterization of such
graphs is known. We characterize distance-hereditary graphs admitting a cct in
terms of forbidden induced subgraphs. This extends similar results for chordal
graphs and cographs.


title: Protoplanetary Disk Structure With Grain Evolution: the ANDES Model

abstract:
  We present a self-consistent model of a protoplanetary disk: 'ANDES'
('AccretioN disk with Dust Evolution and Sedimentation'). ANDES is based on a
flexible and extendable modular structure that includes 1) a 1+1D
frequency-dependent continuum radiative transfer module, 2) a module to
calculate the chemical evolution using an extended gas-grain network with
UV/X-ray-driven processes surface reactions, 3) a module to calculate the gas
thermal energy balance, and 4) a 1+1D module that simulates dust grain
evolution. For the first time, grain evolution and time-dependent molecular
chemistry are included in a protoplanetary disk model. We find that grain
growth and sedimentation of large grains to the disk midplane lead to a
dust-depleted atmosphere. Consequently, dust and gas temperatures become higher
in the inner disk (R < 50 AU) and lower in the outer disk (R > 50 AU), in
comparison with the disk model with pristine dust. The response of disk
chemical structure to the dust growth and sedimentation is twofold. First, due
to higher transparency a partly UV-shielded molecular layer is shifted closer
to the dense midplane. Second, the presence of big grains in the disk midplane
delays the freeze-out of volatile gas-phase species such as CO there, while in
adjacent upper layers the depletion is still effective. Molecular
concentrations and thus column densities of many species are enhanced in the
disk model with dust evolution, e.g., CO2, NH2CN, HNO, H2O, HCOOH, HCN, CO. We
also show that time-dependent chemistry is important for a proper description
of gas thermal balance.


title:
Energy spectrum of pseudospin-electron model in the dynamical mean-field
  theory

abstract:
  The pseudospin-electron model in the case of infinite on-site electron
repulsion is investigated. The electron energy spectrum is calculated within
the framework of the dynamical mean field theory (DMFT), and the alloy analogy
approximation is developed. The effect of the pseudospin-electron interaction,
local asymmetry field, and tunneling-like level splitting on the existence and
the number of electron subbands is investigated. The relation of the
pseudospin-electron model to the problem of energy spectrum of boson-fermion
mixtures in optical lattices is discussed.


title: Critical reflexivity in financial markets: a Hawkes process analysis

abstract:
  We model the arrival of mid-price changes in the E-Mini S&P futures contract
as a self-exciting Hawkes process. Using several estimation methods, we find
that the Hawkes kernel is power-law with a decay exponent close to -1.15 at
short times, less than approximately 10^3 seconds, and crosses over to a second
power-law regime with a larger decay exponent of approximately -1.45 for longer
times scales in the range [10^3, 10^6] seconds. More importantly, we find that
the Hawkes kernel integrates to unity independently of the analysed period,
from 1998 to 2011. This suggests that markets are and have always been close to
criticality, challenging a recent study which indicates that reflexivity
(endogeneity) has increased in recent years as a result of increased automation
of trading. However, we note that the scale over which market events are
correlated has decreased steadily over time with the emergence of higher
frequency trading.


title: Quantum dynamics of vortices in mesoscopic magnetic disks

abstract:
  Model of quantum depinning of magnetic vortex cores from line defects in a
disk geometry and under the application of an in-plane magnetic field has been
developed within the framework of the Caldeira-Leggett theory. The
corresponding instanton solutions are computed for several values of the
magnetic field. Expressions for the crossover temperature Tc and for the
depinning rate \Gamma(T) are obtained. Fitting of the theory parameters to
experimental data is also presented.


title: Restricted Successive Minima

abstract:
  We give bounds on the successive minima of an $o$-symmetric convex body under
the restriction that the lattice points realizing the successive minima are not
contained in a collection of forbidden sublattices. Our investigations extend
former results to forbidden full-dimensional lattices, to all successive minima
and complement former results in the lower dimensional case.


title:
N\'eel to valence-bond solid transition on the honeycomb lattice:
  Evidence for deconfined criticality

abstract:
  We study a spin-1/2 SU(2) model on the honeycomb lattice with
nearest-neighbor antiferromagnetic exchange $J$ that favors N\'eel order, and
competing 6-spin interactions $Q$ which favor a valence bond solid (VBS) state
in which the bond-energies order at the "columnar" wavevector ${\mathbf K} =
(2\pi/3,-2\pi/3)$. We present quantum Monte-Carlo evidence for a direct
continuous quantum phase transition between N\'eel and VBS states, with
exponents and logarithmic violations of scaling consistent with those at
analogous deconfined critical points on the square lattice. Although this
strongly suggests a description in terms of deconfined criticality, the
measured three-fold anisotropy of the phase of the VBS order parameter shows
unusual near-marginal behaviour at the critical point.


title: Investigate The Performance Evaluation of IPTV over WiMAX Networks

abstract:
  Deployment Video on Demand (VoD) over the next generation (WiMAX) has become
one of the intense interest subjects in the research these days, and is
expected to be the main revenue generators in the near future and the
efficiency of video streaming over next generation 4G is the key to enabling
this. We are considering video streaming for real time video was coded by
different H.264.x codes (H.264/AVC, and SVC), and we consider an IP-Unicast to
deliver this streaming video over WiMAX. Our approach investigates the
performance evaluation of IPTV (VoD) over WiMAX networks. OPNET is used to
investigate the performance of VoD over WiMAX. Results obtained from simulation
indicate that SVC video codec is an appropriate video codec for video streaming
over WiMAX.


title: Water vapor in the protoplanetary disk of DG Tau

abstract:
  Water is key in the evolution of protoplanetary disks and the formation of
comets and icy/water planets. While high excitation water lines originating in
the hot inner disk have been detected in several T Tauri stars (TTSs), water
vapor from the outer disk, where most of water ice reservoir is stored, was
only reported in the closeby TTS TW Hya. We present spectrally resolved
Herschel/HIFI observations of the young TTS DG Tau in the ortho- and para-
water ground-state transitions at 557, 1113 GHz. The lines show a narrow
double-peaked profile, consistent with an origin in the outer disk, and are
~19-26 times brighter than in TW Hya. In contrast, CO and [C II] lines are
dominated by emission from the envelope/outflow, which makes H2O lines a unique
tracer of the disk of DG Tau. Disk modeling with the thermo-chemical code
ProDiMo indicates that the strong UV field, due to the young age and strong
accretion of DG Tau, irradiates a disk upper layer at 10-90 AU from the star,
heating it up to temperatures of 600 K and producing the observed bright water
lines. The models suggest a disk mass of 0.015-0.1 Msun, consistent with the
estimated minimum mass of the solar nebula before planet formation, and a water
reservoir of ~1e2-1e3 Earth oceans in vapour, and ~100 times larger in the form
of ice. Hence, this detection supports the scenario of ocean delivery on
terrestrial planets by impact of icy bodies forming in the outer disk.


title:
Evolution of variable range hopping in strongly localized two
  dimensional electron gas at NdAlO3/SrTiO3 (100) heterointerfaces

abstract:
  We report evolution of the two-dimensional electron gas behavior at the
NdAlO3/SrTiO3 heterointerfaces with varying thicknesses of the NdAlO3
overlayer. The samples with a thicker NdAlO3 show strong localizations at low
temperatures and the degree of localization is found to increase with the
NdAlO3 thickness. The T -1/3 temperature dependence of the sheet resistance at
low temperatures and the magnetoresistance study reveal that the conduction is
governed by a two-dimensional variable range hopping mechanism in this strong
localized regime. We attribute this thickness dependence of the transport
properties of the NdAlO3/SrTiO3 interfaces to the interface strain induced by
the overlayers.


title: Smoothing equations for large P\'olya urns

abstract:
  Consider a balanced non triangular two-color P\'olya-Eggenberger urn process,
assumed to be large which means that the ratio sigma of the replacement matrix
eigenvalues satisfies 1/2<sigma <1. The composition vector of both discrete
time and continuous time models admits a drift which is carried by the
principal direction of the replacement matrix. In the second principal
direction, this random vector admits also an almost sure asymptotics and a
real-valued limit random variable arises, named WDT in discrete time and WCT in
continous time. The paper deals with the distributions of both W. Appearing as
martingale limits, known to be nonnormal, these laws remain up to now rather
mysterious.
  Exploiting the underlying tree structure of the urn process, we show that WDT
and WCT are the unique solutions of two distributional systems in some suitable
spaces of integrable probability measures. These systems are natural extensions
of distributional equations that already appeared in famous algorithmical
problems like Quicksort analysis. Existence and unicity of the solutions of the
systems are obtained by means of contracting smoothing transforms. Via the
equation systems, we find upperbounds for the moments of WDT and WCT and we
show that the laws of WDT and WCT are moment-determined. We also prove that WDT
is supported by the whole real line and admits a continuous density (WCT was
already known to have a density, infinitely differentiable on R\{0} and not
bounded at the origin).


title: On smooth lattice polytopes with small degree

abstract:
  Toric geometry provides a bridge between the theory of polytopes and
algebraic geometry: one can associate to each lattice polytope a polarized
toric variety. In this paper we explore this correspondence to classify smooth
lattice polytopes having small degree, extending a classification provided by
Dickenstein, Di Rocco and Piene. Our approach consists in interpreting the
degree of a polytope as a geometric invariant of the corresponding polarized
variety, and then applying techniques from Adjunction Theory and Mori Theory.


title:
Periodic Solutions to Dissipative Hyperbolic Systems. II: Hopf
  Bifurcation for Semilinear Problems

abstract:
  We consider boundary value problems for semilinear hyperbolic systems of the
type $$ \partial_tu_j + a_j(x,\la)\partial_xu_j + b_j(x,\la,u) = 0, \;
x\in(0,1), \;j=1,\dots,n $$ with smooth coefficient functions $a_j$ and $b_j$
such that $b_j(x,\la,0) = 0$ for all $x \in [0,1]$, $\la \in \R$, and
$j=1,\ldots,n$. We state conditions for Hopf bifurcation, i.e., for existence,
local uniqueness (up to phase shifts), smoothness and smooth dependence on
$\la$ of time-periodic solutions bifurcating from the zero stationary solution.
Furthermore, we derive a formula which determines the bifurcation direction.
  The proof is done by means of a Liapunov-Schmidt reduction procedure. For
this purpose, Fredholm properties of the linearized system and implicit
function theorem techniques are used.
  There are at least two distinguishing features of Hopf bifurcation theorems
for hyperbolic PDEs in comparison with those for parabolic PDEs or for ODEs:
First, the question if a non-degenerate time-periodic solution depends smoothly
on the system parameters is much more delicate. And second, a sufficient amount
of dissipativity is needed in the system, and a priori it is not clear how to
verify this in terms of the data of the PDEs and of the boundary conditions.


title:
Measurement of kT splitting scales in W->lv events at sqrt(s)=7 TeV with
  the ATLAS detector

abstract:
  A measurement of splitting scales, as defined by the kT clustering algorithm,
is presented for final states containing a W boson produced in proton--proton
collisions at a centre-of-mass energy of 7 TeV. The measurement is based on the
full 2010 data sample corresponding to an integrated luminosity of 36 pb-1
which was collected using the ATLAS detector at the CERN Large Hadron Collider.
Cluster splitting scales are measured in events containing W bosons decaying to
electrons or muons. The measurement comprises the four hardest splitting scales
in a kT cluster sequence of the hadronic activity accompanying the W boson, and
ratios of these splitting scales. Backgrounds such as multi-jet and
top-quark-pair production are subtracted and the results are corrected for
detector effects. Predictions from various Monte Carlo event generators at
particle level are compared to the data. Overall, reasonable agreement is found
with all generators, but larger deviations between the predictions and the data
are evident in the soft regions of the splitting scales.


title:
An Analytical Model of Radiation-Induced Charge Transfer Inefficiency
  for CCD Detectors

abstract:
  The European Space Agency's Gaia mission is scheduled for launch in 2013. It
will operate at L2 for 5 years, rotating slowly to scan the sky so that its two
optical telescopes will repeatedly observe more than one billion stars. The
resulting data set will be iteratively reduced to solve for the position,
parallax and proper motion of every observed star. The focal plane contains 106
large area silicon CCDs continuously operating in a mode where the line
transfer rate and the satellite rotation are in synchronisation.
  One of the greatest challenges facing the mission is radiation damage to the
CCDs which will cause charge deferral and image shape distortion. This is
particularly important because of the extreme accuracy requirements of the
mission. Despite steps taken at hardware level to minimise the effects of
radiation, the residual distortion will need to be calibrated during the
pipeline data processing. Due to the volume and inhomogeneity of data involved,
this requires a model which describes the effects of the radiation damage which
is physically realistic, yet fast enough to implement in the pipeline. The
resulting charge distortion model was developed specifically for the Gaia CCD
operating mode. However, a generalised version is presented in this paper and
this has already been applied in a broader context, for example to investigate
the impact of radiation damage on the Euclid dark-energy mission data.


title: Three-dimensional conformally symmetric manifolds

abstract:
  The non-existence of non-trivial conformally symmetric manifolds in the
three-dimensional Riemannian setting is shown. In Lorentzian signature, a
complete local classification is obtained. Furthermore, the isometry classes
are examined.


title: Graphene transistors for bioelectronics

abstract:
  This paper provides an overview on graphene solution-gated field effect
transistors (SGFETs) and their applications in bioelectronics. The fabrication
and characterization of arrays of graphene SGFETs is presented and discussed
with respect to competing technologies. To obtain a better understanding of the
working principle of solution-gated transistors, the graphene-electrolyte
interface is discussed in detail. The in-vitro biocompatibility of graphene is
assessed by primary neuron cultures. Finally, bioelectronic experiments with
electrogenic cells are presented, confirming the suitability of graphene to
record the electrical activity of cells.


title: Blind One-Bit Compressive Sampling

abstract:
  The problem of 1-bit compressive sampling is addressed in this paper. We
introduce an optimization model for reconstruction of sparse signals from 1-bit
measurements. The model targets a solution that has the least l0-norm among all
signals satisfying consistency constraints stemming from the 1-bit
measurements. An algorithm for solving the model is developed. Convergence
analysis of the algorithm is presented. Our approach is to obtain a sequence of
optimization problems by successively approximating the l0-norm and to solve
resulting problems by exploiting the proximity operator. We examine the
performance of our proposed algorithm and compare it with the binary iterative
hard thresholding (BIHT) [10] a state-of-the-art algorithm for 1-bit
compressive sampling reconstruction. Unlike the BIHT, our model and algorithm
does not require a prior knowledge on the sparsity of the signal. This makes
our proposed work a promising practical approach for signal acquisition.


title:
Calculation of the electrostatic energy of two charged helices on rods
  in a generalized braid geometry

abstract:
  This is a technical document that outlines a calculation of an electrostatic
interaction energy between two rods, with charge helices on them, forming a
braid. We deal here with screened electrostatics. A general braid geometry is
considered, though to obtain local expressions for the energy the curvature of
the rods is considered to be small. Further approximations are made for small
tilt angle. This is a generalization of the calculations given in the
supplemental material of [R. Cortini et Al, Biophys. J. 101 875 (2011)] for a
straight symmetric braid structure, using a different method of calculation
where the braid geometry does not need to be supposed a priori.

categories: math-ph cond-mat.soft math.MP physics.class-ph


title:
Graphene field-effect transistors with gigahertz-frequency power gain on
  flexible substrates

abstract:
  The development of flexible electronics operating at radio-frequencies (RF)
requires materials that combine excellent electronic performance and the
ability to withstand high levels of strain. In this work, we fabricate graphene
field-effect transistors (GFETs) on flexible substrates from graphene grown by
chemical vapor deposition (CVD). Our devices demonstrate unity-current-gain
frequencies, fT, and unity-power-gain frequencies, fmax, up to 10.7 and 3.7
GHz, respectively, with strain limits of 1.75%. These devices represent the
only reported technology to achieve gigahertz-frequency power gain at strain
levels above 0.5%. As such, they demonstrate the potential of CVD graphene to
enable a broad range of flexible electronic technologies which require both
high-flexibility and RF operation.


title: S\'emantique des d\'eterminants dans un cadre richement typ\'e

abstract:
  The variation of word meaning according to the context leads us to enrich the
type system of our syntactical and semantic analyser of French based on
categorial grammars and Montague semantics (or lambda-DRT). The main advantage
of a deep semantic analyse is too represent meaning by logical formulae that
can be easily used e.g. for inferences. Determiners and quantifiers play a
fundamental role in the construction of those formulae. But in our rich type
system the usual semantic terms do not work. We propose a solution ins- pired
by the tau and epsilon operators of Hilbert, kinds of generic elements and
choice functions. This approach unifies the treatment of the different determi-
ners and quantifiers as well as the dynamic binding of pronouns. Above all,
this fully computational view fits in well within the wide coverage parser
Grail, both from a theoretical and a practical viewpoint.


title: Accessibility percolation on n-trees

abstract:
  Accessibility percolation is a new type of percolation problem inspired by
evolutionary biology. To each vertex of a graph a random number is assigned and
a path through the graph is called accessible if all numbers along the path are
in ascending order. For the case when the random variables are independent and
identically distributed, we derive an asymptotically exact expression for the
probability that there is at least one accessible path from the root to the
leaves in an $n$-tree. This probability tends to 1 (0) if the branching number
is increased with the height of the tree faster (slower) than linearly. When
the random variables are biased such that the mean value increases linearly
with the distance from the root, a percolation threshold emerges at a finite
value of the bias.


title: A geometric study of Wasserstein spaces: an addendum on the boundary

abstract:
  We extend the geometric study of the Wasserstein space W(X) of a simply
connected, negatively curved metric space X by investigating which pairs of
boundary points can be linked by a geodesic, when X is a tree.


title: Fictitious Supercontinent Cycles

abstract:
  Descriptions of phenomena, events, or processes made on the basis of
problematic paradigms can be unreasonably complex (e.g. epicycles) or simply
wrong (e.g. ultraviolet catastrophe). Supercontinent cycles, also called Wilson
cycles, are, I submit, artificial constructs, like epicycles. Here I provide
the basis for that assertion and describe published considerations from a
fundamentally different, new, indivisible geoscience paradigm which obviate the
necessity for assuming supercontinent cycles.


title: On the phase structure and thermodynamics of QCD

abstract:
  We discuss the phase structure and thermodynamics of QCD by means of
dynamical chiral effective models. Quark and meson fluctuations are included
via the functional renormalization group. We study the influence of confinement
in addition to the impact of fluctuations by comparing the results of the
chiral models to their Polyakov-loop extended versions. Furthermore, we discuss
the mass sensitivity of the phase structure and thermodynamics and find
interesting modifications close to the chiral limit.


title: Singular solutions of fractional elliptic equations with absorption

abstract:
  The aim of this paper is to study the singular solutions to fractional
elliptic equations with absorption $$ \left\{\arraycolsep=1pt
\begin{array}{lll} (-\Delta)^\alpha u+|u|^{p-1}u=0,\quad &
\rm{in}\quad\Omega\setminus\{0\},\\[2mm] u=0,\quad & \rm{in}\quad
\R^N\setminus\Omega,\\[2mm] \lim_{x\to 0}u(x)=+\infty, \end{array} \right. $$
where $p>0$, $\Omega$ is an open, bounded and smooth domain of $\R^N\ (N\ge2)$
with $0\in\Omega$. We analyze the existence, nonexistence, uniqueness and
asymptotic behavior of the solutions.


title: Thermodynamics and kinetics of elementary particles in cosmology

abstract:
  Several lectures for non-experts on equilibrium and non-equilibrium kinetics
in expanding universe are presented. An establishment of thermal equilibrium in
the ealry universe as well as mechanisms leading to deviations from the
equilibrium are discussed. In the first lecture an elementary introduction to
cosmology is presented. Next, kinetic equation in Friedman-Robertson-Walker
mertric is considered. Properties of its solutions for different types of
particles, in particular, for photons of cosmic microwave background radiation,
neutrinos, and massive particles, which could be cold dark matter ones, are
analyzed. It is shown, in particular, that despite being massless, neutrinos
noticeably deviate from equilibrium. Next the modification of the detailed
balance condition in the case of broken T-invariance is discussed and it is
shown that the standard equilibrium distribution functions remain unchanged.
Possible modification of the standard kinetics in the case of broken CPT and
applications to baryogenesis are considered.


title:
Spin-pairing and penetration depth measurements from nuclear magnetic
  resonance in NaFe$_{0.975}$Co$_{0.025}$As

abstract:
  We have performed $^{75}$As nuclear magnetic resonance (NMR) Knight shift
measurements on single crystals of NaFe$_{0.975}$Co$_{0.025}$As to show that
its superconductivity is a spin-paired, singlet state consistent with
predictions of the weak-coupling BCS theory. We use a spectator nucleus,
$^{23}$Na, uncoupled from the superconducting condensate, to determine the
diamagnetic magnetization and to correct for its effect on the $^{75}$As NMR
spectra. The resulting temperature dependence of the spin susceptibility
follows the Yosida function as predicted by BCS for an isotropic, single-valued
energy gap. Additionally, we have analyzed the $^{23}$Na spectra that become
significantly broadened by vortices to obtain the superconducting penetration
depth as a function of temperature with $\lambda_{ab}(0) = 5,327 \pm$
78$\,\AA$.