title: The physical properties of Fermi BL Lac objects jets

abstract:
  We investigate the physical properties of BL Lac objects (BL Lacs) jets by
modeling the quasi-simultaneous spectral energy distributions (SEDs) of 22 {\it
Fermi} BL Lac objects in the frame of a simple one-zone synchrotron
self-Compton (SSC) model. We obtained the best-fit model parameters and their
uncertainties for each BL Lac object through the $\chi^2$-minimization
procedure and discussed their implications on the physical processes. The
modeling results show that the one-zone SSC model can successfully fit the SEDs
of high-synchrotron-peaked BL Lacs (HBLs) and intermediate-synchrotron-peaked
BL Lacs (IBLs), but fails to explain the SEDs of low-synchrotron-peaked BL Lacs
(LBLs). The statistical analysis results for model parameters are summarized as
follows. (1) No correlation is found between magnetic field ($B$) and the
broken energy of relativistic electrons distribution ($\gamma^{\prime}_{\rm
b}$) for HBLs and IBLs, but there are inverse correlations between
$\gamma^{\prime}_{\rm b}$ and the radius of emitting blob ($R^{\prime}_{\rm
b}$) as well as the electrons number $K^{\prime}_{\rm e}$ for HBLs and IBLs.
It's therefore concluded that the variation of $\gamma^{\prime}_{\rm b}$ is
mainly caused by that of $R^{\prime}_{\rm b}$ rather than $B$ for HBLs and
IBLs. (2) The Poynting flux in jets can not account for the observed radiations
since the power in Poynting flux is smaller than the radiative power, and the
cold protons could be the primary energy carrier in the jets.


title: Peer Ratings in Massive Online Social Networks

abstract:
  Instant quality feedback in the form of online peer ratings is a prominent
feature of modern massive online social networks (MOSNs). It allows network
members to indicate their appreciation of a post, comment, photograph, etc.
Some MOSNs support both positive and negative (signed) ratings. In this study,
we rated 11 thousand MOSN member profiles and collected user responses to the
ratings. MOSN users are very sensitive to peer ratings: 33% of the subjects
visited the researcher's profile in response to rating, 21% also rated the
researcher's profile picture, and 5% left a text comment. The grades left by
the subjects are highly polarized: out of the six available grades, the most
negative and the most positive are also the most popular. The grades fall into
three almost equally sized categories: reciprocal, generous, and stingy. We
proposed quantitative measures for generosity, reciprocity, and benevolence,
and analyzed them with respect to the subjects' demographics.


title:
Profile decompositions of fractional Schr\"odinger equations with
  angularly regular data

abstract:
  We study the fractional Schr\"odinger equations in $\mathbb R^{1+d}, d \geq
3$ of order ${d}/({d-1}) < \al < 2$. Under the angular regularity assumption we
prove linear and nonlinear profile decompositions which extend the previous
results \cite{chkl2} to data without radial assumption. As applications we show
blowup phenomena of solutions to mass-critical fractional Hartree equations.


title:
Interference Statistics and Capacity Analysis for Uplink Transmission in
  Two-Tier Small Cell Networks: A Geometric Probability Approach

abstract:
  Small cell networks are evolving as an economically viable solution to
ameliorate the capacity and coverage of state-of-the-art wireless cellular
systems. Nonetheless, the dense and unplanned deployment of the small cells
(e.g., femtocells, picocells) with restricted user access significantly
increases the impact of interference on the overall network performance. To
this end, this paper presents a novel framework to derive the statistics of the
interference considering dedicated and shared spectrum access for uplink
transmissions in two-tier small cell networks such as the macrocell-femtocell
networks. The derived expressions are validated by the Monte-Carlo simulations.
Numerical results are generated to assess the feasibility of shared and
dedicated spectrum access in femtocells under varying traffic load and spectral
reuse scenarios.


title:
On the length of Golomb Ruler: A function construction approach based on
  difference triangle

abstract:
  Since the significance of Golomb Ruler Problem in some context, we proposes a
function construction approach based on difference triangle to generate
near-optimal Golomb rulers. Let x1, x2, ..., xn be an increasing sequence of
integers, where x1 = 0, which satisfies the following conditions: if abs(xi-xj)
= abs(xp-xq) then {i, j} = {p,q}. Our objective is to find the order of minimum
xn for any given n. In this paper, the two results in a paper are both
improved. In addition, it will be shown that the length of Golomb Ruler have
been shortened to a half, and that the satisfying sequence can not be generated
by such a quadratic formula as $xi = ai^2+bni+ci+dn^2+en+f$ for any rational a,
b, c, d, e and f.


title:
Modular Matrices as Topological Order Parameter by Gauge Symmetry
  Preserved Tensor Renormalization Approach

abstract:
  Topological order has been proposed to go beyond Landau symmetry breaking
theory for more than twenty years. But it is still a challenging problem to
generally detect it in a generic many-body state. In this paper, we will
introduce a systematic numerical method based on tensor network to calculate
modular matrices in 2D systems, which can fully identify topological order with
gapped edge. Moreover, it is shown numerically that modular matrices, including
S and T matrices, are robust characterization to describe phase transitions
between topologically ordered states and trivial states, which can work as
topological order parameters. This method only requires local information of
one ground state in the form of a tensor network, and directly provides the
universal data (S and T matrices), without any non-universal contributions.
Furthermore it is generalizable to higher dimensions. Unlike calculating
topological entanglement entropy by extrapolating, which numerical complexity
is exponentially high, this method extracts a much more complete set of
topological data (modular matrices) with much lower numerical cost.


title: (0,2) ADE Models From Four Dimensions

abstract:
  Four dimensional N=1 supersymmetric gauge theories with unitary gauge groups
and matter in the adjoint and fundamental representations give rise to a series
of non-trivial fixed points with an ADE classification. Many of these models
exhibit generalizations of Seiberg duality. Upon compactification on a
two-torus with suitable background fields for global U(1) symmetries, they flow
at long distances to two dimensional theories with (0,2) supersymmetry. We
study these theories, focusing on the two dimensional analogs of the four
dimensional dualities.


title:
License Plate Recognition (LPR): A Review with Experiments for Malaysia
  Case Study

abstract:
  Most vehicle license plate recognition use neural network techniques to
enhance its computing capability. The image of the vehicle license plate is
captured and processed to produce a textual output for further processing. This
paper reviews image processing and neural network techniques applied at
different stages which are preprocessing, filtering, feature extraction,
segmentation and recognition in such way to remove the noise of the image, to
enhance the image quality and to expedite the computing process by converting
the characters in the image into respective text. An exemplar experiment has
been done in MATLAB to show the basic process of the image processing
especially for license plate in Malaysia case study. An algorithm is adapted
into the solution for parking management system. The solution then is
implemented as proof of concept to the algorithm.


title:
The influence of $\mathfrak{F_{\mathrm s}}$-quasinormality of subgroups
  on the structure of finite groups

abstract:
  Let $\frak{F}$ be a class of finite groups. A subgroup $H$ of a finite group
$G$ is said to be $\mathfrak{F_{\mathrm s}}$-quasinormal in $G$ if there exists
a normal subgroup $T$ of $G$ such that $HT$ is $s$-permutable in $G$ and
$(H\cap T)H_G/H_G$ is contained in the $\frak{F}$-hypercenter
$Z_\infty^\mathfrak{F}(G/H_G)$ of $G/H_G$. In this paper, we investigate
further the influence of $\mathfrak{F_{\mathrm s}}$-quasinormality of some
subgroups on the structure of finite groups. New characterization of some
classes of finite groups are obtained.


title: A Study of Various Steganographic Techniques Used for Information Hiding

abstract:
  Steganography derives from the Greek word steganos, meaning covered or
secret, and graphy (writing or drawing). Steganography is a technology where
modern data compression, information theory, spread spectrum, and cryptography
technologies are brought together to satisfy the need for privacy on the
Internet. This paper is an attempt to analyse the various techniques used in
steganography and to identify areas in which this technique can be applied, so
that the human race can be benefited at large.


title: Spectral Curve Fitting for Automatic Hyperspectral Data Analysis

abstract:
  Automatic discovery and curve fitting of absorption bands in hyperspectral
data can enable the analyst to identify materials present in a scene by
comparison with library spectra. This procedure is common in laboratory
spectra, but is challenging for sparse hyperspectral data. A procedure for
robust discovery of overlapping bands in hyperspectral data is described in
this paper. The method is capable of automatically discovering and fitting
symmetric absorption bands, can separate overlapping absorption bands in a
stable manner, and has relatively low sensitivity to noise. A comparison with
techniques already available in the literature is presented using simulated
spectra. An application is demonstrated utilizing the shortwave infrared
(2.0-2.5 micron or 5000-4000 cm-1) region. A small hyperspectral scene is
processed to demonstrate the ability of the method to detect small shifts in
absorption wavelength caused by varying white mica chemistry in a natural
setting.


title:
Constraining warm dark matter with 21 cm line fluctuations due to
  minihalos

abstract:
  Warm dark matter (WDM) with mass m_WDM = O(1) keV has long been discussed as
a promising solution for discrepancies between cosmic structures observed at
small scales and predications of the concordance CDM model. Though several
cosmological observations such as the Lyman-alpha forest have already begun to
constrain the range of m_WDM, WDM is yet to be fully excluded as a solution for
these so-called small-scale problems. In this paper, we study 21 cm line
fluctuations from minihalos in a WDM model and evaluate constraints on m_WDM
for future cosmological 21 cm surveys, such as SKA and FFTT. We show that,
since WDM with mass m_WDM>10 keV decreases the abundance of minihalos by
suppressing the matter power spectrum on small scales via free-streaming, such
WDM can significantly affect the resultant 21 cm line fluctuations from
minihalos. We find that if the 21 cm signal from minihalos can be observed
above z>5, SKA and FFTT can give lower bounds m_WDM>24 keV and 31 keV,
respectively, which are tighter than the current constraint. These future 21 cm
surveys might be able to rule out a WDM model as a solution of small-scale
problems.


title:
Equal-Interval Splitting of Quantum Tunneling in Single-Molecule Magnets
  with Identical Exchange Coupling

abstract:
  The equal-interval splitting of quantum tunneling observed in
simple-Ising-model systems of Ni$_{4}$ (3D) and Mn$_3$ (2D) single-molecule
magnets (SMMs) is reported. The splitting is due to the identical exchange
coupling in the SMMs, and is simply determined by the difference between the
two numbers of the spin-down $n_{\downarrow}$ and spin-up $n_{\uparrow}$
molecules neighboring to the tunneling molecule. The splitting may be presented
as $(n_{\downarrow}-n_{\uparrow})JS/{g\mu_{0}\mu_{B}}$, and the number of the
splittings follows $n+1$ where $n=n_{\downarrow}+n_{\uparrow}$ is the
coordination number. Besides, since the quantum tunneling is heavily dependent
on local spin environment, the manipulation of quantum tunneling may become
feasible for this kind of system, which may shed new light on novel
applications of SMMs.


title: The First Gamma-Ray Bursts in the Universe

abstract:
  Gamma-ray bursts (GRBs) are the ultimate cosmic lighthouses, capable of
illuminating the universe at its earliest epochs. Could such events probe the
properties of the first stars at z $\sim$ 20, the end of the cosmic Dark Ages?
Previous studies of Population III GRBs only considered explosions in the
diffuse relic H II regions of their progenitors, or bursts that are far more
more energetic than those observed to date. But the processes that produce GRBs
at the highest redshifts likely reset their local environments, creating much
more complicated structures than those in which relativistic jets have been
modeled so far. These structures can greatly affect the luminosity of the
afterglow, and hence the redshift at which it can be detected. We have now
simulated Population III GRB afterglows in H II regions, winds, and dense
shells ejected by the star during the processes that produce the burst. Our
model, which has been used in previous work, has been extended to include
contributions from reverse shocks, inverse Compton cooling and the effects of
sphericity and beaming in the blast wave, and is valid in a variety of
circumjet density profiles. We find that GRBs with E$_{\mathrm{iso},\gamma} =$
10$^{ 51}$ - 10$^{53}$ erg will be visible at z $\gtrsim$ 20 to the next
generation of near infrared and radio observatories. In many cases, the
environment of the burst, and hence progenitor type, can be inferred from the
afterglow light curve. Although some Population III GRBs are visible to Swift
and the Very Large Array now, the optimal strategy for their detection will be
future missions like EXIST and JANUS, which have large survey areas and onboard
X-ray and infrared telescopes that can track their near infrared flux from the
moment of the burst, thereby identifying its redshift.


title:
High-contrast Coherent Population Trapping based on Crossed Polarizers
  Method

abstract:
  We developed a method based on crossed polarizers to observe high-contrast
coherent population trapping (CPT) resonance. Since crossed polarizers have a
simple optical system, our method is suitable for chip-scale atomic clocks
(CSACs). We calculated the Faraday rotation in CPT in a linearly polarized
light field (lin || lin) using two pairs of lambda system models based on the
density matrix and estimated the spectrum of the Faraday rotation. After that,
we measured the contrast and linewidth with the crossed polarizers method. A
comparison of the theoretical model and experiment data showed they were in
good agreement. Moreover, the experimental results showed that a high contrast
(88.4 %) and narrow linewidth (1.15 kHz) resonance could be observed using a Cs
gas cell and D1-line vertical-cavity surfaceemitting laser (VCSEL).


title:
On Controllability and Near-controllability of Multi-input Discrete-time
  Bilinear Systems in Dimension Two

abstract:
  This paper completely solves the controllability problems of two-dimensional
multi-input discrete-time bilinear systems with and without drift. Necessary
and sufficient conditions for controllability, which cover the existing
results, are obtained by using an algebraic method. Furthermore, for the
uncontrollable systems, near-controllability is studied and necessary and
sufficient conditions for the systems to be nearly controllable are also
presented. Examples are provided to demonstrate the conceptions and results of
the paper.


title: On the group of alternating colored permutations

abstract:
  The group of alternating colored permutations is the natural analogue of the
classical alternating group, inside the wreath product $\mathbb{Z}_r \wr S_n$.
We present a 'Coxeter-like' presentation for this group and compute the length
function with respect to that presentation. Then, we present this group as a
covering of $\mathbb{Z}_{\frac{r}{2}} \wr S_n$ and use this point of view to
give another expression for the length function. We also use this covering to
lift several known parameters of $\mathbb{Z}_{\frac{r}{2}} \wr S_n$ to the
group of alternating colored permutations.


title: Generalized L\"uscher's Formula in Multichannel Baryon-Baryon Scattering

abstract:
  In this paper, L\"uscher's formula is generalized to the case of two
spin-$\frac{1}{2}$ particles in two-channel scattering based on Ref.
\cite{Li:2012bi}. This is first done in a non-relativistic quantum mechanics
model and then generalized to quantum field theory. We show that L\"uscher's
formula obtained from these two different methods are equivalent up to terms
that are exponentially suppressed in the box size. This formalism can be
readily applied to future lattice QCD calculations.


title:
Dense molecular cloud cores as a source of micrometer-sized grains in
  galaxies

abstract:
  Coreshine in dense molecular cloud cores (dense cores) is interpreted as
evidence for micrometer-sized grains (referred to as very large grains, VLGs).
VLGs may have a significant influence on the total dust amount and the
extinction curve. We estimate the total abundance of VLGs in the Galaxy,
assuming that dense cores are the site of VLG formation. We find that the VLG
abundance relative to the total dust mass is roughly $\phi_\mathrm{VLG}\sim
0.01(1-\epsilon )/\epsilon (\tau_\mathrm{SF}/5\times 10^9~\mathrm{yr})^{-1}
(f_\mathrm{VLG}/0.5)(t_\mathrm{shat}/10^8~\mathrm{yr})$, where $\epsilon$ is
the star formation efficiency in dense cores, $\tau_\mathrm{SF}$ the timescale
of gas consumption by star formation, $f_\mathrm{VLG}$ the fraction of dust
mass eventually coagulated into VLGs in dense cores, and $t_\mathrm{shat}$ the
lifetime of VLGs (determined by shattering). Adopting their typical values for
the Galaxy, we obtain $\phi_\mathrm{VLG}\sim 0.02$--0.09. This abundance is
well below the value detected in the heliosphere by Ulysses and Galileo, which
means that local enhancement of VLG abundance in the solar neighborhood is
required if the VLGs originate from dense cores. We also show that the effects
of VLGs on the extinction curve are negligible even with the upper value of the
above range, $\phi_\mathrm{VLG}\sim 0.09$. If we adopt an extreme value,
$\phi_\mathrm{VLG}\sim 0.5$, close to that inferred from the above spacecraft
data, the extinction curve is still in the range of the variation in Galactic
extinction curves, but is not typical of the diffuse ISM.


title:
Well-Posed Bayesian Geometric Inverse Problems Arising in Subsurface
  Flow

abstract:
  In this paper, we consider the inverse problem of determining the
permeability of the subsurface from hydraulic head measurements, within the
framework of a steady Darcy model of groundwater flow. We study geometrically
defined prior permeability fields, which admit layered, fault and channel
structures, in order to mimic realistic subsurface features; within each layer
we adopt either constant or continuous function representation of the
permeability. This prior model leads to a parameter identification problem for
a finite number of unknown parameters determining the geometry, together with
either a finite number of permeability values (in the constant case) or a
finite number of fields (in the continuous function case). We adopt a Bayesian
framework showing existence and well-posedness of the posterior distribution.
We also introduce novel Markov Chain-Monte Carlo (MCMC) methods, which exploit
the different character of the geometric and permeability parameters, and build
on recent advances in function space MCMC. These algorithms provide rigorous
estimates of the permeability, as well as the uncertainty associated with it,
and only require forward model evaluations. No adjoint solvers are required and
hence the methodology is applicable to black-box forward models. We then use
these methods to explore the posterior and to illustrate the methodology with
numerical experiments.


title: The combinatorics of S, M, L, XL - The best fitting delivery of T-shirts

abstract:
  We consider the problem of approximating the branch and size dependent demand
of a fashion discounter with many branches by a distributing process being
based on the branch delivery restricted to integral multiples of lots from a
small set of available lot-types. We propose a formalized model which arises
from a practical cooperation with an industry partner. Besides an integer
linear programming formulation we provide an appropriate primal heuristic for
this problem.


title: Phononic crystal waveguides for electromechanical circuits

abstract:
  Nanoelectromechanical systems (NEMS), utilising localised mechanical
vibrations, were pioneered for sensors, signal processors and to study
macroscopic quantum mechanics. Increasingly the concept of integrating multiple
mechanical elements via electrical/optical means has emerged as a challenge
towards NEMS circuits. Here we develop phononic crystal waveguides (PnC WGs),
using a 1-dimensional array of suspended membranes, that offer purely
mechanical means to integrate isolated NEMS resonators. In the first steps to
this objective, we demonstrate the PnC WG can support and guide mechanical
vibrations where the periodic membrane arrangement also creates a phonon
bandgap that enables the phonon propagation velocity to be controlled.
Additionally embedding a phonon-cavity into the PnC allows mechanical
vibrations in the WG to be dynamically switched or transferred to the cavity,
illustrating the availability of WG-resonator coupling. These highly functional
traits of the PnC WG architecture exhibit all the ingredients necessary to
permit the realisation of all-phononic NEMS circuits.


title: Accurate Parallax Measurement toward the Symbiotic Star R Aquarii

abstract:
  Multi-epoch phase-referencing VLBI (Very Long Baseline Interferometry)
observations with VERA (VLBI Exploration of Radio Astrometry) were performed
for the symbiotic star R Aquarii (R Aqr) from September 2005 to Oct 2006.
Tracing one of the $v=2$, $J=1-0$ SiO maser spots, we measured an annual
parallax of $\pi = 4.59\pm0.24$ mas, corresponding to a distance of
$218_{-11}^{+12}$ pc. Our result is consistent with earlier distance
measurements, but yields the highest accuracy of about $5\%$ level. Applying
our distance, we derived an absolute K-band magnitude of $M_{\mathrm{K}} =
-7.71 \pm 0.11$, which is consistent with the recent Period-Luminosity relation
by VLBI parallax measurements for 5 OH-Mira variables. In addition, the
expansion age of an inner nebulae around R Aqr is found to be about 240 years,
corresponds to about the year 1773.


title:
Parity switching and decoherence by quasiparticles in single-junction
  transmons

abstract:
  The transmon superconducting qubit is being intensely investigated as a
promising approach for the physical implementation of quantum information
processing, and high quality factors of order $10^6$ have been achieved both in
two- and three-dimensional architectures. These high quality factors enable
detailed investigations of decoherence mechanisms. An intrinsic decoherence
process originates from the coupling between the qubit degree of freedom and
the quasiparticles that tunnel across Josephson junctions. In a transmon,
tunneling of a single quasiparticle is associated with a change in parity. Here
we present the theory of the parity-switching rates in single-junction
transmons and compare it with recent measurements. We also show that parity
switching can have an important role in limiting the coherence time.


title: Disentangling defect-induced ferromagnetism in SiC

abstract:
  We present a detailed investigation of the magnetic properties in SiC single
crystals bombarded with neon ions. Through careful measuring of the
magnetization of virgin and irradiated SiC, we decompose the magnetization of
SiC into paramagnetic, superparamagnetic, and ferromagnetic contributions. The
ferromagnetic contribution persists well above room temperature and exhibits a
pronounced magnetic anisotropy. We qualitatively explain the magnetic
properties as a result of the intrinsic clustering tendency of defects.


title:
Robust Cooperation in the Prisoner's Dilemma: Program Equilibrium via
  Provability Logic

abstract:
  We consider the one-shot Prisoner's Dilemma between algorithms with
read-access to one anothers' source codes, and we use the modal logic of
provability to build agents that can achieve mutual cooperation in a manner
that is robust, in that cooperation does not require exact equality of the
agents' source code, and unexploitable, meaning that such an agent never
cooperates when its opponent defects. We construct a general framework for such
"modal agents", and study their properties.


title: Shaping the dust mass - star-formation rate relation

abstract:
  There is a remarkably tight relation between the observationally inferred
dust masses and star-formation rates (SFRs) of SDSS galaxies, Mdust $\propto$
SFR$^{1.11}$ (Da Cunha et al. 2010). Here we extend the Mdust-SFR relation to
the high end and show that it bends over at very large SFRs (i.e., dust masses
are lower than predicted for a given SFR). We identify several distinct
evolutionary processes in the diagram: (1) A star-bursting phase in which dust
builds up rapidly at early times. The maximum attainable dust mass in this
process is the cause of the bend-over of the relation. A high dust-formation
efficiency, a bottom-light initial mass function, and negligible supernova
shock dust destruction are required to produce sufficiently high dust masses.
(2) A quiescent star-forming phase in which the subsequent parallel decline in
dust mass and SFR gives rise to the Mdust-SFR relation, through astration and
dust destruction. The dust-to-gas ratio is approximately constant along the
relation. We show that the power-law slope of the Mdust-SFR relation is
inversely proportional to the global Schmidt-Kennicutt law exponent (i.e.,
$\sim 0.9$) in simple chemical evolution models. (3) A quenching phase which
causes star formation to drop while the dust mass stays roughly constant or
drops proportionally. Combined with merging, these processes, as well as the
range in total baryonic mass, give rise to a complex population of the diagram
which adds significant scatter to the original Mdust-SFR relation. (4) At very
high redshifts, a population of galaxies located significantly below the local
relation is predicted.


title:
Application of the nuclear equation of state obtained by the variational
  method to core-collapse supernovae

abstract:
  The equation of state (EOS) for hot asymmetric nuclear matter which is
constructed with the variational method starting from the Argonne v18 and
Urbana IX nuclear forces is applied to spherically symmetric core-collapse
supernovae (SNe). We first investigate the EOS of isentropic beta-stable SN
matter, and find that the matter with the variational EOS is more neutron-rich
than that with the Shen EOS. Using the variational EOS for uniform matter
supplemented by the Shen EOS of non-uniform matter at low densities, we perform
general-relativistic spherically symmetric simulations of core-collapse SNe
with and without neutrino transfer, starting from a presupernova model of 15
solar mass. In the adiabatic simulation without neutrino transfer, the
explosion is successful, and the explosion energy with the variational EOS is
larger than that with the Shen EOS. In the case of the simulation with neutrino
transfer, the shock wave stalls and then the explosion fails, as in other
spherically symmetric simulations. The inner core with the variational EOS is
more compact than that with the Shen EOS, due to the relative softness of the
variational EOS. This implies that the variational EOS is more advantageous for
SN explosions than the Shen EOS.


title: Polynomial Transformation Method for Non-Gaussian Noise Environment

abstract:
  Signal processing in non-Gaussian noise environment is addressed in this
paper. For many real-life situations, the additive noise process present in the
system is found to be dominantly non-Gaussian. The problem of detection and
estimation of signals corrupted with non-Gaussian noise is difficult to track
mathematically. In this paper, we present a novel approach for optimal
detection and estimation of signals in non-Gaussian noise. It is demonstrated
that preprocessing of data by the orthogonal polynomial approximation together
with the minimum error-variance criterion converts an additive non-Gaussian
noise process into an approximation-error process which is close to Gaussian.
The Monte Carlo simulations are presented to test the Gaussian hypothesis based
on the bicoherence of a sequence. The histogram test and the kurtosis test are
carried out to verify the Gaussian hypothesis.


title:
Efficient allocation of heterogeneous response times in information
  spreading process

abstract:
  Recently, the impacts of spatiotemporal heterogeneities of human activities
on spreading dynamics have attracted extensive attention. In this paper, to
study heterogeneous response times on information spreading, we focus on the
susceptible-infected spreading dynamics with adjustable power-law response time
distribution based on uncorrelated scale-free networks. We find that the
stronger the heterogeneity of response times is, the faster the information
spreading is in the early and middle stages. Following a given heterogeneity,
the procedure of reducing the correlation between the response times and
degrees of individuals can also accelerate the spreading dynamics in the early
and middle stages. However, the dynamics in the late stage is slightly more
complicated, and there is an optimal value of the full prevalence time changing
with the heterogeneity of response times and the response time-degree
correlation, respectively. The optimal phenomena results from the efficient
allocation of heterogeneous response times.


title:
Beyond One-Way Communication: Degrees of Freedom of Multi-Way Relay MIMO
  Interference Networks

abstract:
  We characterize the degrees of freedom (DoF) of multi-way relay MIMO
interference networks. In particular, we consider a wireless network consisting
of 4 user nodes, each with M antennas, and one N-antenna relay node. In this
network, each user node sends one independent message to each of the other user
nodes, and there are no direct links between any two user nodes, i.e., all
communication must pass through the relay node. For this network, we show that
the symmetric DoF value per message is given by max(min(M/3,N/7),min(2M/7,N/6))
normalized by space dimensions, i.e., piecewise linear depending on M and N
alternatively. While the information theoretic DoF upper bound is established
for every M and N, the achievability relying on linear signal subspace
alignment is established in the spatially-normalized sense in general. In
addition, by deactivating 4 messages to form a two-way relay MIMO X channel, we
also present the DoF result in the similar piecewise linear type. The central
new insight to emerge from this work is the notion of inter-user signal
subspace alignment incorporating the idea of network coding, which is the key
to achieve the optimal DoF for multi-way relay interference networks. Moreover,
this work also settles the feasibility of linear interference alignment that
extends the feasibility framework from one-way to multi-way relay interference
networks.


title: Improved Online Square-into-Square Packing

abstract:
  In this paper, we show an improved bound and new algorithm for the online
square-into-square packing problem. This two-dimensional packing problem
involves packing an online sequence of squares into a unit square container
without any two squares overlapping. The goal is to find the largest area
$\alpha$ such that any set of squares with total area $\alpha$ can be packed.
We show an algorithm that can pack any set of squares with total area $\alpha
\leq 3/8$ into a unit square in an online setting, improving the previous bound
of $11/32$.


title: Second Main Theorem in the Tropical Projective Space

abstract:
  Tropical Nevanlinna theory, introduced by Halburd and Southall as a tool to
analyze integrability of ultra-discrete equations, studies the growth and
complexity of continuous piecewise linear real functions. The purpose of this
paper is to extend tropical Nevanlinna theory to n-dimensional tropical
projective spaces by introducing a natural characteristic function for tropical
holomorphic curves, and by proving a tropical analogue of Cartan's second main
theorem. It is also shown that in the 1-dimensional case this result implies a
known tropical second main theorem due to Laine and Tohge.


title: Water-filled telescopes

abstract:
  In this short note we discuss the case of the thought experiments on
water-filled telescopes and their realizations during 18th and 19th century.
The story of those instruments shows that the scientific progress occurs in a
curious way, since there was no stringent reason for the construction of a
water-filled telescope.


title: Higgs-dilaton(radion) system confronting the LHC Higgs data

abstract:
  We consider the Higgs-dilaton(radion) system using the trace of
energy-momentum tensor ($T_{~\mu}^\mu$) with the full Standard Model (SM) gauge
symmetry $G_{\rm SM} \equiv SU(3)_c \times SU(2)_L \times U(1)_Y$, and find out
that the resulting phenomenology for the Higgs-dilaton(radion) system is
distinctly different from the earlier studies based on the $T_{~\mu}^\mu$ with
the unbroken subgroup $H_{\rm SM} \equiv SU(3)_c \times U(1)_{\rm em}$ of
$G_{\rm SM}$. After electroweak symmetry breaking (EWSB), the SM Higgs boson
and dilaton(radion) will mix with each other, and there appear two Higgs-like
scalar bosons and the Higgs-dilaton mixing changes the scalar phenomenology in
interesting ways. The signal strengths for the $gg$-initiated channels could be
modified significantly compared with the SM predictions due to the QCD scale
anomaly and the Higgs-dilaton(radion) mixing, whereas anomaly contributions are
almost negligible for other channels. We also discuss the self-couplings and
the signal strengths of the $126$ GeV scalar boson in various channels and
possible constraints from the extra light/heavy scalar boson. The
Higgs-dilaton(radion) system considered in this work has a number of
distinctive features that could be tested by the upcoming LHC running and at
the ILC.


title:
Purely Surface Electric Transport Phenomenon on a Three-Dimensional
  Topological Insulator

abstract:
  We theoretically study the electric current induced by the temporally
oscillating magnetic field onto a three-dimensional topological insulator based
on the linear response theory. The electric current flows on its surface
because of the unique characters of the surface states: the linear dispersion
in two-dimension and the chiral spin texture on the Fermi surface. In the bulk
region, on the other hand, the current is absent because of the degeneracy for
the bulk bands. The response function has a peak structure when the frequency
of the magnetic field is equal to twice of the Fermi energy of the surface
states measured from the Dirac node. This feature is unique to the surface
states on the three-dimensional topological insulator.


title: Modular Macdonald functions and Generalized Newton's identity

abstract:
  Based on a generalized Newton's identity, we construct a family of symmetric
functions which deform the modular Hall-Littlewood functions. We also give a
determinant formula for the Macdonald functions.


title:
The Gabor-Einstein Wavelet: A Model for the Receptive Fields of V1 to MT
  Neurons

abstract:
  Our visual system is astonishingly efficient at detecting moving objects.
This process is mediated by the neurons which connect the primary visual cortex
(V1) to the middle temporal (MT) area. Interestingly, since Kuffler's
pioneering experiments on retinal ganglion cells, mathematical models have been
vital for advancing our understanding of the receptive fields of visual
neurons. However, existing models were not designed to describe the most
salient attributes of the highly specialized neurons in the V1 to MT motion
processing stream; and they have not been able to do so. Here, we introduce the
Gabor-Einstein wavelet, a new family of functions for representing the
receptive fields of V1 to MT neurons. We show that the way space and time are
mixed in the visual cortex is analogous to the way they are mixed in the
special theory of relativity (STR). Hence we constrained the Gabor-Einstein
model by requiring: (i) relativistic-invariance of the wave carrier, and (ii)
the minimum possible number of parameters. From these two constraints, the sinc
function emerged as a natural descriptor of the wave carrier. The particular
distribution of lowpass to bandpass temporal frequency filtering properties of
V1 to MT neurons (Foster et al 1985; DeAngelis et al 1993b; Hawken et al 1996)
is clearly explained by the Gabor-Einstein basis. Furthermore, it does so in a
manner innately representative of the motion-processing stream's neuronal
hierarchy. Our analysis and computer simulations show that the distribution of
temporal frequency filtering properties along the motion processing stream is a
direct effect of the way the brain jointly encodes space and time. We uncovered
this fundamental link by demonstrating that analogous mathematical structures
underlie STR and joint cortical spacetime encoding. This link will provide new
physiological insights into how the brain represents visual information.


title: Phase transitions in a system of hard rectangles on the square lattice

abstract:
  The phase diagram of a system of monodispersed hard rectangles of size
$m\times m k$ on a square lattice is numerically determined for $m=2,3$ and
aspect ratio $k= 1,2,\ldots, 7$. We show the existence of a disordered phase, a
nematic phase with orientational order, a columnar phase with orientational and
partial translational order, and a solid-like phase with sublattice order, but
no orientational order. The asymptotic behavior of the phase boundaries for
large $k$ are determined using a combination of entropic arguments and a Bethe
approximation. This allows us to generalize the phase diagram to larger $m$ and
$k$, showing that for $k \geq 7 $, the system undergoes three entropy driven
phase transitions with increasing density. The nature of the different phase
transitions are established and the critical exponents for the continuous
transitions are determined using finite size scaling.


title: The existence of non-abelian local constants and their properties

abstract:
  In his Ph.D thesis, John Tate attached local constants with characters of a
non-Archimedean local field of characteristic zero. Robert Langlands proved the
existence theorem of non-abelian local constants of higher dimensional complex
local Galois representations. Later Helmut Koch summarized Langlands' strategy
and gave shorter version (group theoretic) of Langlands' proof. The Brauer
induction formula plays a very crucial role in the Langlands' proof. Robert
Boltje gives a canonical version of the Brauer induction formula. In this
paper, we review the Langlands' strategy via Boltje's canonical Brauer
induction formula. After that we also review properties of local constants,
some applications and open problems.


title: Electrical and Thermal Control of Magnetic Exchange Interactions

abstract:
  We investigate the far-from-equilibrium nature of magnetic anisotropy and
exchange interactions between molecular magnets embedded in a tunnel junction.
By mapping to an effective spin model, these magnetic interactions can be
divided into three types: isotropic Heisenberg, anisotropic Ising, and
anisotropic Dzyaloshinski-Moriya contributions, which are attributed to the
background non-equilibrium electronic structures. We further demonstrate that
both the magnetic self and exchange interactions can be controlled either
electrically by gating and tuning voltage bias, or thermally by adjusting
temperature bias. We show that the Heisenberg and Ising interactions scale
linearly, while the Dzyaloshinski-Moriya interaction scales quadratically, with
the molecule-lead coupling strength. The interactions scale linearly with the
effective spin-polarizations of the leads and the molecular coherence. Our
results pave a way for smart control of magnetic exchange interactions at
atomic and molecular levels.


title: C IV absorption line variability in X-ray bright BALQSOs

abstract:
  We report kinematic shift and strength variability of C IV broad absorption
line (BAL) trough in two high-ionization X-ray bright QSOs SDSS J085551+375752
(at zem ~ 1.936) and SDSS J091127+055054 (at zem ~ 2.793). Both these QSOs have
shown combination of profile shift, appearance and disappearance of absorption
components belonging to a single BAL trough. The observed average kinematic
shift of whole BAL profile resulted in an average deceleration of ~ -0.7 +-
0.1, -2.0 +- 0.1 cm/s^2 over a rest-frame time-span of 3.11 yr and 2.34 yr for
SDSS J085551+375752 and SDSS J091127+055054, respectively. To our knowledge,
these are the largest kinematic shifts exceeding by factor of about 2.8, 7.8
than the highest deceleration reported in the literature; making both of them
as a potential candidate to investigate outflows using multi-wavelength
monitoring for their line and continuum variability. We explore various
possible mechanisms to understand the observed profile variations. Outflow
models involving many small self-shielded clouds moving probably in a curved
path provides the simplest explanation for the C IV BAL strength and velocity
variations along with the X-ray bright nature of these sources.


title:
Molecules and dust in Cas A: I - Synthesis in the supernova phase and
  processing by the reverse shock in the clumpy remnant

abstract:
  Aims: We study the chemistry of the Type IIb supernova ejecta that led to the
Cas A supernova remnant to assess the chemical type and quantity of dust that
forms and evolves in the remnant phase. We later model a dense oxygen-rich
ejecta knot that is crossed by the reverse shock in Cas A to study the
evolution of the clump gas phase and the possibility to reform dust clusters in
the post-reverse shock gas.
  Methods: A chemical network including all processes efficient at high gas
temperatures and densities is considered. The formation of key bimolecular
species (CO, SiO) and dust clusters is described. Stiff, coupled, ordinary,
differential equations are solved for the conditions pertaining to both the SN
ejecta and the post-reverse shock gas.
  Results: We find that the ejecta of Type IIb SNe are unable to form large
amounts of molecules and dust clusters as opposed to their Type II-P
counterparts because of their diffuse ejecta. The gas density needs to be
increased by several orders of magnitude to allow the formation of dust
clusters. We show that the chemical composition of the dust clusters changes
drastically and gains in chemical complexity with increasing gas density.
Hence, the ejecta of the Cas A supernova progenitor must have been in the form
of dense clumps to account for the dust chemical composition and masses
inferred from infrared observations of Cas A. We show that the ejecta molecules
in a clump that is processed by the reverse shock reform in the post-reverse
shock gas with lower abundances than those of the initial ejecta clump, except
SiO. These molecules include CO, SiS and O2. Dust clusters are destroyed by the
reverse shock and do not reform in the post-reverse shock gas, even for the
highest gas density. These results indicate that the synthesis of dust grains
from the gas phase in the dense knots of Cas A and in other supernova remnants
is unlikely.


title: Multilevel Dyson Brownian motions via Jack polynomials

abstract:
  We introduce multilevel versions of Dyson Brownian motions of arbitrary
parameter $\beta>0$, generalizing the interlacing reflected Brownian motions of
Warren for $\beta=2$. Such processes unify $\beta$ corners processes and Dyson
Brownian motions in a single object. Our approach is based on the approximation
by certain multilevel discrete Markov chains of independent interest, which are
defined by means of Jack symmetric polynomials. In particular, this approach
allows to show that the levels in a multilevel Dyson Brownian motion are
intertwined (at least for $\beta\ge 1$) and to give the corresponding link
explicitly.


title:
Spontaneous breaking of spacetime symmetries and the inverse Higgs
  effect

abstract:
  It has been long known that when spacetime symmetry is spontaneously broken,
some of the broken generators may not give rise to independent gapless,
Nambu-Goldstone excitations. We provide two complementary viewpoints of this
phenomenon. On the one hand, we show that the corresponding field degrees of
freedom have the same symmetry transformation properties as massive, matter
fields. The "inverse Higgs constraints", sometimes employed to eliminate these
modes from the theory, are reinterpreted as giving a field parametrization that
makes these transformation properties manifest. On the other hand, relations
among classical symmetry transformations generally lead to identities for the
associated Noether currents that allow saturation of the Ward-Takahashi
identities for all the broken symmetries with fewer gapless excitations than
suggested by mere counting of broken generators.


title: Global Hopf Bifurcation in the ZIP regulatory system

abstract:
  Regulation of zinc uptake in roots of Arabidopsis thaliana has recently been
modeled by a system of ordinary differential equations based on the uptake of
zinc, expression of a transporter protein and the interaction between an
activator and inhibitor. For certain parameter choices the steady state of this
model becomes unstable upon variation in the external zinc concentration.
Numerical results show periodic orbits emerging between two critical values of
the external zinc concentration. Here we show the existence of a global Hopf
bifurcation with a continuous family of stable periodic orbits between two Hopf
bifurcation points. The stability of the orbits in a neighborhood of the
bifurcation points is analyzed by deriving the normal form, while the stability
of the orbits in the global continuation is shown by calculation of the Floquet
multipliers. From a biological point of view, stable periodic orbits lead to
potentially toxic zinc peaks in plant cells. Buffering is believed to be an
efficient way to deal with strong transient variations in zinc supply. We
extend the model by a buffer reaction and analyze the stability of the steady
state in dependence of the properties of this reaction. We find that a large
enough equilibrium constant of the buffering reaction stabilizes the steady
state and prevents the development of oscillations. Hence, our results suggest
that buffering has a key role in the dynamics of zinc homeostasis in plant
cells.


title:
What is the Pairing Glue in the Cuprates? Insights from Normal and
  Anomalous Propagators

abstract:
  Both the pairing and the pair-breaking modes lead to similar kinks of the
electron dispersion curves in superconductors, and therefore the photoemission
spectroscopy can not be straightforwardly applied in search for their pairing
glue. If the momentum-dependence of the normal and anomalous self-energy can be
neglected, manipulation with the data does allow us to extract the gap function
$\Delta(\omega)$ and therefore also the pairing glue. However, in the
superconducting cuprates such procedure may not be justified. In this paper we
point out that the pairing glue is more directly visible in the spectral
function of the Nambu-Gor'kov anomalous propagator and we demonstrate that this
function is in principle experimentally observable.


title:
Correct quantitative determination of ethanol and volatile compounds in
  alcohol products

abstract:
  Determination of the volume content of ethanol in the alcohol products in
practice is usually determined by pycnometry, electronic densimetry, or
densimetry using a hydrostatic balance in accordance with Commission Regulation
No 2870/2000. However, these methods determine directly only density of the
tested liquid sample and does not take into account the effects of other
volatile components such as aldehydes, esters and higher alcohols. So they are
appropriate only for binary water-ethanol solutions in accordance with
international table adopted by the International Legal Metrology Organization
in its Recommendation No 22. Availability notable concentrations of the higher
alcohols and ethers in different alcohol-based products, e. g. in whisky,
cognac, brandy, wine as well as in waste alcohol and alcohol beverage
production, leads to the significant contribution of these compounds in the
value of the density of tested alcohol-containing sample. As a result,
determination of the volume of ethanol content for such alcohol products in
gives the value of the strength, which may significantly differ from the true
one. Using incorrectly calculated volume content of ethyl alcohol leads to
incorrect results determining the quantities of volatile compounds in the
alcohol-containing products, expressed in milligrams per liter of absolute
alcohol. We propose experimental results of the method of correct determination
of ethanol and other volatile compounds content in waste products of alcohol
and alcoholic beverage industry by gas chromatography. Calculations are based
on the measured value of sample density and volatile compound concentrations
expressed in mg per liter of absolute alcohol [JAFC 61(2013)2950]. The method
can be easily incorporated into daily practice of analytical and control
laboratories with no additional material, financial or time costs.


title:
Scaling relations of cluster elliptical galaxies at z~1.3.
  Distinguishing luminosity and structural evolution

abstract:
  [Abridged] We studied the size-surface brightness and the size-mass relations
of a sample of 16 cluster elliptical galaxies in the mass range
10^{10}-2x10^{11} M_sun which were morphologically selected in the cluster RDCS
J0848+4453 at z=1.27. Our aim is to assess whether they have completed their
mass growth at their redshift or significant mass and/or size growth can or
must take place until z=0 in order to understand whether elliptical galaxies of
clusters follow the observed size evolution of passive galaxies. To compare our
data with the local universe we considered the Kormendy relation derived from
the early-type galaxies of a local Coma Cluster reference sample and the WINGS
survey sample. The comparison with the local Kormendy relation shows that the
luminosity evolution due to the aging of the stellar content already assembled
at z=1.27 brings them on the local relation. Moreover, this stellar content
places them on the size-mass relation of the local cluster ellipticals. These
results imply that for a given mass, the stellar mass at z~1.3 is distributed
within these ellipticals according to the same stellar mass profile of local
ellipticals. We find that a pure size evolution, even mild, is ruled out for
our galaxies since it would lead them away from both the Kormendy and the
size-mass relation. If an evolution of the effective radius takes place, this
must be compensated by an increase in the luminosity, hence of the stellar mass
of the galaxies, to keep them on the local relations. We show that to follow
the Kormendy relation, the stellar mass must increase as the effective radius.
However, this mass growth is not sufficient to keep the galaxies on the
size-mass relation for the same variation in effective radius. Thus, if we want
to preserve the Kormendy relation, we fail to satisfy the size-mass relation
and vice versa.


title: Unimodality and genus distributions

abstract:
  New criteria are shown that certain combinations of finite unimodal
polynomials are unimodal. %Given unimodal polynomials with explicit expressions
and dependent recursion relations, we propose an approach to determine their
modes. As applications, unimodality of several polynomial sequences satisfying
dependent recurrence relations and their modes are provided. Then unimodality
of genus distributions for some ladders and crosses can be determined. As
special cases, that of genus distributions for Closed-end ladders, circular
ladders, M\"{o}bius ladders and Ringel ladders and their modes are given, which
induces the known results for Closed-end ladders.


title:
Dimensional operators for mathematical morphology on simplicial
  complexes

abstract:
  In this work we study the framework of mathematical morphology on simplicial
complex spaces. Simplicial complexes are widely used to represent
multidimensional data, such as meshes, that are two dimensional complexes, or
graphs, that can be interpreted as one dimensional complexes. Mathematical
morphology is one of the most powerful frameworks for image processing,
including the processing of digital structures, and is heavily used for many
applications. However, mathematical morphology operators on simplicial complex
spaces is not a concept fully developed in the literature. Specifically, we
explore properties of the dimensional operators, small, versatile operators
that can be used to define new operators on simplicial complexes, while
maintaining properties from mathematical morphology. These operators can also
be used to recover many morphological operators from the literature. Matlab
code and additional material, including the proofs of the original properties,
are freely available at
\url{https://code.google.com/p/math-morpho-simplicial-complexes.}


title:
Optical Analogue of Quantum Spin Hall Effect in a Two-Dimensional
  Gyrotropic Photonic Crystal

abstract:
  We propose an optical counterpart of the quantum spin Hall (QSH) effect in a
two-dimensional photonic crystal composed of a gyrotropic medium exhibiting
both gyroelectric and gyromagnetic properties simultaneously. Such QSH effect
shows unidirectional polarization-dependent transportation of photonic
topological edged states, which is robust against certain disorders and
impurities. More importantly, we find that such unique property is not
protected by conventional time-reversal symmetry of photons obeying the Bosonic
statistics but rather by the same symmetry, as electron's time-reversal
symmetry. Based on the tight-binding approximation approach, we construct an
effective Hamiltonian for this photonic structure, which is shown to have a
similar form to that of an electronic QSH system. Furthermore, the invariant of
such model is calculated in order to unify its topological non-trivial
character. Our finding provides a viable way to exploit the optical topological
property, and also can be leveraged to develop a photonic platform to mimic the
spin properties of electrons.


title: Further remarks on the "Smith is Huq" condition

abstract:
  We compare the 'Smith is Huq' condition (SH) with three commutator conditions
in semi-abelian categories: first an apparently weaker condition which arose in
joint work with Bourn and turns out to be equivalent with (SH), then an
apparently equivalent condition which takes commutation of non-normal
subobjects into account and turns out to be stronger than (SH). This leads to
the even stronger condition that weighted commutators (in the sense of Gran,
Janelidze and Ursini) are independent of the chosen weight, which is known to
be false for groups but turns out to be true in any two-nilpotent semi-abelian
category.


title:
Espace des twisteurs d'une vari\'et\'e quaternionique K\"ahler
  g\'en\'eralis\'ee

abstract:
  To give an almost quaternionic structure on a 4n-manifold $M$ is equivalent
to give its bundle of twistors $Z(Q)\longrightarrow M$. When $Q$ is invariant
under a torsion free connection, $Z(Q) $ can be provided with an almost complex
structure $ \mathbb J $. In the case $ n = 1 $ Atiyah, Hitchin and Singer have
related the integrability of $ \mathbb J $ to the geometry of $ (M, Q) $. For $
n> 1 $ Salamon showed that the almost complex structure $ \mathbb J $ on $ Z
(Q) $ is always integrable. The purpose of this article is to extend these
results to the generalized complex geometry. We begin by defining the concept
of almost generalized quaternionic manifolds $ (M, g, \mathcal Q ) $. We will
see that we can associate a twistor space denoted by $ \mathcal Z( \mathcal Q)
$ which is a $ \mathbb S^2$-bundle over $ M $. When $\mathcal Q$ is invariant
under a generalized torsion free connection, then $ \mathcal Z(\mathcal Q) $
comes with an almost generalized complex structure $\mathbb J$. Whatever the
dimension of $ M $ is, we give a criterion for integrability of the almost
generalized complex structure $ \mathbb J $ on $ \mathcal Z(\mathcal Q) $. In
the particular case where $ (M, g,\mathcal Q) $ is a generalized quaternionic
K\"ahler manifold, we show that $\mathbb J$ is always integrable as soon as
$n>1$. We illustrate this work by giving several examples of generalized
quaternionic K\"ahler manifolds for which the almost generalized complex
structure $ \mathbb J $ on the twistor space $ \mathcal Z(\mathcal Q) $ is
integrable.


title: Implicit QR for Companion-like Pencils

abstract:
  A fast implicit QR algorithm for eigenvalue computation of low rank
corrections of unitary matrices is adjusted to work with matrix pencils arising
from polynomial zerofinding problems . The modified QZ algorithm computes the
generalized eigenvalues of certain NxN rank structured matrix pencils using
O(N^2) ops and O(N) memory storage. Numerical experiments and comparisons
confirm the effectiveness and the stability of the proposed method.


title: Quality Indicators for Collective Systems Resilience

abstract:
  Resilience is widely recognized as an important design goal though it is one
that seems to escape a general and consensual understanding. Often mixed up
with other system attributes; traditionally used with different meanings in as
many different disciplines; sought or applied through diverse approaches in
various application domains, resilience in fact is a multi-attribute property
that implies a number of constitutive abilities. To further complicate the
matter, resilience is not an absolute property but rather it is the result of
the match between a system, its current condition, and the environment it is
set to operate in. In this paper we discuss this problem and provide a
definition of resilience as a property measurable as a system-environment fit.
This brings to the foreground the dynamic nature of resilience as well as its
hard dependence on the context. A major problem becomes then that, being a
dynamic figure, resilience cannot be assessed in absolute terms. As a way to
partially overcome this obstacle, in this paper we provide a number of
indicators of the quality of resilience. Our focus here is that of collective
systems, namely those systems resulting from the union of multiple individual
parts, sub-systems, or organs. Through several examples of such systems we
observe how our indicators provide insight, at least in the cases at hand, on
design flaws potentially affecting the efficiency of the resilience strategies.
A number of conjectures are finally put forward to associate our indicators
with factors affecting the quality of resilience.


title: Spherical collapse for unified dark matter models

abstract:
  We study the non-linear spherical "top hat" collapse for Chaplygin and
viscous unified cosmologies. The term unified refers to models where dark
energy and dark matter are replaced by one single component. For the
generalized Chaplygin gas (GCG) we extend previous results of [R. A. A.
Fernandes {\it et al}. Physical Review D 85, 083501 (2012)]. We discuss the
differences at non-linear level between the GCG with $\alpha=0$ and the
$\Lambda$CDM model. We show that both are indeed different. The bulk viscous
model which differs from the GCG due to the existence of non-adiabatic
perturbations is also studied. In this case, the clustering process is in
general suppressed and the viable parameter space of the viscous model that
accelerates the background expansion does not lead to collapsed structures.
This result challenges the viability of unified viscous models.


title: Higgs Naturalness and Dark Matter Stability by Scale Invariance

abstract:
  Extending the spacetime symmetries of standard model (SM) by scale invariance
(SI) may address the Higgs naturalness problem. In this article we attempt to
embed accidental dark matter (DM) into SISM, requiring that the symmetry
protecting DM stability is accidental due to the model structure rather than
imposed by hand. In this framework, if the light SM-like Higgs boson is the
pseudo Goldstone boson of SI spontaneously breaking, we can even pine down the
model, two-Higgs-doublets plus a real singlet: The singlet is the DM candidate
and the extra Higgs doublet triggers electroweak symmetry breaking via the
Coleman-Weinberg mechanism; Moreover, it dominates DM dynamics. We study
spontaneously breaking of SI using the Gillard-Weinberg approach and find that
the second doublet should acquire vacuum expectation value near the weak scale.
Moreover, its components should acquire masses around 380 GeV except for a
light CP-odd Higgs boson. Based on these features, we explore viable ways to
achieve the correct relic density of DM, facing stringent constraints from
direct detections of DM. For instance, DM annihilates into $b\bar b$ near the
SM-like Higgs boson pole, or into a pair of CP-odd Higgs boson with mass above
that pole.


title:
Stability of the Superfluid State in Three-Component Fermionic Optical
  Lattice Systems

abstract:
  Three-component fermionic optical lattice systems are investigated in
dynamical mean-field theory for the Hubbard model. Solving the effective
impurity model by means of continuous-time quantum Monte Carlo simulations in
the Nambu formalism, we find that the $s$-wave superfluid state proposed
recently is indeed stabilized in the repulsively interacting case and appears
along the first-order phase boundary between the metallic and paired Mott
states in the paramagnetic system. The BCS-BEC crossover in the three-component
fermionic system is also addressed.


title:
The effect of exceptionally high fluorine doping on the anisotropy of
  single crystalline SmFeAsO1-xFx

abstract:
  We succeeded in growing single crystalline SmFeAsO1-xFx with exceptionally
high fluorine concentration by using a CsCl flux method. Comparing to
conventional flux methods, this method can introduce about double the amount of
fluorine into the oxygen site. The obtained single crystal shows the highest
superconducting transition temperature (Tc = 57.5 K) in single crystalline iron
pnictides. In addition, the residual resistivity ratio (RRR) is almost three
times as large as that of previously reported single crystals. This suggests
that our single crystals are suitable for investigation of the intrinsic
superconducting properties since they have few defects and impurities. Using
both the Werthamer-Helfand-Hohenberg model and the effective mass model, we
demonstrated that a higher fluorine concentration suppresses the anisotropic
superconductivity of SmFeAsO1-xFx.


title:
Formalization and Verification of Hierarchical Use of Interaction
  Overview Diagrams Using Timing Diagrams

abstract:
  Thanks to its graphical notation and simplicity, Unified Modeling Language
(UML) is a de facto standard and a widespread language used in both industry
and academia, despite the fact that its semantics is still informal. The
Interaction Overview Diagram (IOD) is introduced in UML2; it allows the
specification of the behavior in the hierarchical way. This paper is a
contribution towards a formal dynamic semantics of UML2. We start by
formalizing the Hierarchical use of IOD. Afterward, we complete the mapping of
IOD, Sequence Diagrams and Timing Diagrams into Hierarchical Colored Petri Nets
(HCPNs) using the Timed colored Petri Nets (timed CP-net). Our approach helps
designers to get benefits from abstraction as well as refinement at more than
two levels of hierarchy which reduces verification complexity.


title: A precision of the sequential change point detection

abstract:
  A random sequence having two segments being the homogeneous Markov processes
is registered. Each segment has his own transition probability law and the
length of the segment is unknown and random. The transition probabilities of
each process are known and a priori distribution of the disorder moment is
given. The decision maker aim is to detect the moment of the transition
probabilities change. The detection of the disorder rarely is precise. The
decision maker accepts some deviation in estimation of the disorder moment. In
the considered model the aim is to indicate the change point with fixed,
bounded error with maximal probability. The case with various precision for
over and under estimation of this point is analysed. The case when the disorder
does not appears with positive probability is also included. The results
insignificantly extends range of application, explain the structure of optimal
detector in various circumstances and shows new details of the solution
construction. The motivation for this investigation is the modelling of the
attacks in the node of networks. The objectives is to detect one of the attack
immediately or in very short time before or after it appearance with highest
probability. The problem is reformulated to optimal stopping of the observed
sequences. The detailed analysis of the problem is presented to show the form
of optimal decision function.


title:
Simultaneous XMM-\textit{Newton} and HST-COS observation of 1H0419-577:
  II. Broadband spectral modeling of a variable Seyfert galaxy

abstract:
  In this paper we present the longest exposure (97 ks) XMM-Newton EPIC-pn
spectrum ever obtained for the Seyfert 1.5 galaxy 1H 0419-577. With the aim of
explaining the broadband emission of this source, we took advantage of the
simultaneous coverage in the optical/UV that was provided in the present case
by the XMM-Newton Optical Monitor and by a HST-COS observation. Archival FUSE
flux measurements in the FUV were also used for the present analysis. We
successfully modeled the X-ray spectrum together with the optical/UV fluxes
data points using a Comptonization model. We found that a blackbody temperature
of $T \sim 56$ eV accounts for the optical/UV emission originating in the
accretion disk. This temperature serves as input for the Comptonized components
that model the X-ray continuum. Both a warm ($T_{\rm wc} \sim 0.7 $ keV,
$\tau_{\rm wc} \sim 7 $) and a hot corona ($T_{\rm hc} \sim 160 $ keV,
$\tau_{\rm hc} \sim 0.5$) intervene to upscatter the disk photons to X-ray
wavelengths. With the addition of a partially covering ($C_v\sim50\%$) cold
absorber with a variable opacity ($ {\it N}_{\rm H}\sim [10^{19}- 10^{22}]
\,\rm cm^{-2}$), this model can well explain also the historical spectral
variability of this source, with the present dataset presenting the lowest one
(${\it N}_{\rm H}\sim 10^{19} \, \rm cm^{-2} $). We discuss a scenario where
the variable absorber, getting ionized in response to the variations of the
X-ray continuum, becomes less opaque in the highest flux states. The lower
limit for the absorber density derived in this scenario is typical for the
broad line region clouds. Finally, we critically compare this scenario with all
the different models (e.g. disk reflection) that have been used in the past to
explain the variability of this source


title:
Investigating the Possibility of a Turning Point in the Dark Energy
  Equation of State

abstract:
  We investigate a second order $parabolic$ parametrization,
$w(a)=w_t+w_a(a_t-a)^2$, which is a direct characterization of a possible
$turning$ in $w$. The cosmological consequence of this parametrization is
explored by using the observational data of the SNLS3 type Ia supernovae
sample, the CMB measurements from WMAP9 and Planck, the Hubble parameter
measurement from HST, and the baryon acoustic oscillation (BAO) measurements
from 6dFGS, BOSS DR11 and improved WiggleZ. We found the existence of a turning
point in $w$ at $a\sim0.7$ is favored at 1$\sigma$ CL. In the epoch $0.55< a<
0.9$, $w<-1$ is favored at 1$\sigma$ CL, and this significance increases near
$a=0.8$, reaching a 2$\sigma$ CL. The parabolic parametrization achieve
equivalent performance to the $\Lambda$CDM and Chevallier-Polarski-Linder (CPL)
models when the Akaike information criterion was used to assess them. Our
analysis shows the value of considering high order parametrizations when
studying the cosmological constraints on $w$.


title: Comment on "Heat dissipation in atomic-scale junctions"

abstract:
  We discuss the recent results of Lee et al. [Nature 498, 209 (2013)] using
the notion of thermoelectric convection. In particular, we highlight the fact
that this contribution to the thermal flux is not a dissipative process.


title:
Exploring Hoover and Perez's experimental designs using global
  sensitivity analysis

abstract:
  This paper investigates variable-selection procedures in regression that make
use of global sensitivity analysis. The approach is combined with existing
algorithms and it is applied to the time series regression designs proposed by
Hoover and Perez. A comparison of an algorithm employing global sensitivity
analysis and the (optimized) algorithm of Hoover and Perez shows that the
former significantly improves the recovery rates of original specifications.


title: Generalized Penner model and the Gaussian beta ensemble

abstract:
  In this paper, a new expression for the partition function of the generalized
Penner model given by Goulden, Harer and Jackson is derived. The Penner and the
orthogonal Penner partition functions are special cases of this formula. The
parametrized Euler characteristic $\xi^s_g(\gamma)$ deduced from our expression
of the partition function is shown to exhibit a contribution from the orbifold
Euler characteristic of the moduli space of Riemann surfaces of genus $g$, with
$s$ punctures, for all parameters $\gamma$ and $g$ odd. The other contributions
for $g$ even are linear combinations of the Bernoulli polynomials at rational
arguments. It turns out that the free energy coefficients of the generalized
Penner model in the continuum limit, are identical to those coefficients in the
large $N$ expansion of the Gaussian $\beta$-ensemble. Moreover, the duality
enjoyed by the generalized Penner model, is also the duality symmetry of the
Gaussian $\beta$-ensemble. Finally, a shift in the 't Hooft coupling constant
required by the refined topological string, would leave the Gaussian
$\beta$-ensemble duality intact. This duality is identified with the remarkable
duality of the $c=1$ string at radius $R=\beta$.


title: Galaxy Mass Models: MOND versus Dark Matter Halos

abstract:
  Mass models of 15 nearby dwarf and spiral galaxies are presented. The
galaxies are selected to be homogeneous in terms of the method used to
determine their distances, the sampling of their rotation curves (RCs) and the
mass-to-light ratio (M/L) of their stellar contributions, which will minimize
the uncertainties on the mass model results. Those RCs are modeled using the
MOdified Newtonian Dynamics (MOND) prescription and the observationally
motivated pseudo-isothermal (ISO) dark matter (DM) halo density distribution.
For the MOND models with fixed (M/L), better fits are obtained when the
constant a$_{0}$ is allowed to vary, giving a mean value of (1.13 $\pm$ 0.50)
$\times$ 10$^{-8}$ cm s$^{-2}$, compared to the standard value of 1.21 $\times$
10$^{-8}$ cm s$^{-2}$. Even with a$_{0}$ as a free parameter, MOND provides
acceptable fits (reduced $\chi^{2}_{r}$ $<$ 2) for only 60% (9/15) of the
sample. The data suggest that galaxies with higher central surface brightnesses
tend to favor higher values of the constant a$_{0}$. This poses a serious
challenge to MOND since a$_{0}$ should be a universal constant. For the DM
models, our results confirm that the DM halo surface density of ISO models is
nearly constant at $ \rho_{0} \ R_{C} \sim 120\ M_{\odot} \ pc^{-2}$. This
means that if the (M/L) is determined by stellar population models, ISO DM
models are left with only one free parameter, the DM halo central surface
density.


title: Dimensional transition in rotating turbulence

abstract:
  In this work we investigate, by means of direct numerical simulations, how
rotation affects the bi-dimensionalization of a turbulent flow. We study a thin
layer of fluid, forced by a two-dimensional forcing, within the framework of
the "split cascade" in which the injected energy flows both to small scales
(generating the direct cascade) and to large scale (to form the inverse
cascade). It is shown that rotation reinforces the inverse cascade at the
expense of the direct one, thus promoting bi-dimensionalization of the flow.
This is achieved by a suppression of the enstrophy production at large scales.
Nonetheless, we find that, in the range of rotation rates investigated,
increasing the the vertical scale causes a reduction of the flux of the inverse
cascade. Our results suggest that, even in rotating flows, the inverse cascade
may eventually disappear when the vertical scale is sufficiently large with
respect to the forcing scale.


title:
Improved chemical vapor transport growth of transition metal
  dichalcogenides

abstract:
  In the crystal growth of transition metal dichalcogenides by the Chemical
Vapor Transport method (CVT), the choice of the transport agent plays a key
role. We have investigated the effect of various chemical elements and
compounds on the growth of TiSe2, MoSe2, TaS2 and TaSe2 and found that pure I2
is the most suitable for growing TiSe2, whereas transition metal chlorides
perform best with Mo- and Ta- chalcogenides. The use of TaCl5 as a transport
agent in the CVT process allows to selectively growth either polymorph of TaS2
and TaSe2 and the optimum growth conditions are reported. Moreover, by using
TaCl5 and tuning the temperature and the halogen starting ratio, it was
possible to grow whiskers of the compounds TaS2, TaSe2, TaTe2, TaS3 and TaSe3.


title:
Superconducting quantum node for entanglement and storage of microwave
  radiation

abstract:
  Superconducting circuits and microwave signals are good candidates to realize
quantum networks, which are the backbone of quantum computers. We have realized
a quantum node based on a 3D microwave superconducting cavity parametrically
coupled to a transmission line by a Josephson ring modulator. We first
demonstrate the time-controlled capture, storage and retrieval of an optimally
shaped propagating microwave field, with an efficiency as high as 80%. We then
demonstrate a second essential ability, which is the timed-controlled
generation of an entangled state distributed between the node and a microwave
channel.


title: Statistics of dislocation pinning at localized obstacles

abstract:
  Pinning of dislocations at nanosized obstacles like precipitates, voids and
bubbles, is a crucial mechanism in the context of phenomena like hardening and
creep. The interaction between such an obstacle and a dislocation is often
explored at fundamental level by means of analytical tools, atomistic
simulations and finite element methods. Nevertheless, the information extracted
from such studies has not been utilized to its maximum extent on account of
insufficient information about the underlying statistics of this process
comprising a large number of dislocations and obstacles in a system. Here we
propose a new statistical approach, where the statistics of pinning of
dislocations by idealized spherical obstacles is explored by taking into
account the generalized size-distribution of the obstacles along with the
dislocation density within a three-dimensional framework. The application of
this approach, in combination with the knowledge of fundamental
dislocation-obstacle interactions, has successfully been demonstrated for
dislocation pinning at nanovoids in neutron irradiated type 316-stainless steel
in regard to both conservative and non-conservative motions of dislocations.


title: Exact response functions within the time-dependent Gutzwiller approach

abstract:
  We investigate the applicability of the two existing versions of a
time-dependent Gutzwiller approximation (TDGA) beyond the frequently used limit
of infinite spatial dimensions. To this end, we study the two-particle response
functions of a two-site Hubbard model where we can compare the exact results
and those derived from the TDGA. It turns out that only the more recently
introduced version of the TDGA can be combined with a diagrammatic approach
which allows for the evaluation of Gutzwiller wave functions in finite
dimensions. For this TDGA method we derive the time-dependent Lagrangian for
general single-band Hubbard models.


title:
Identifiability of an Integer Modular Acyclic Additive Noise Model and
  its Causal Structure Discovery

abstract:
  The notion of causality is used in many situations dealing with uncertainty.
We consider the problem whether causality can be identified given data set
generated by discrete random variables rather than continuous ones. In
particular, for non-binary data, thus far it was only known that causality can
be identified except rare cases. In this paper, we present necessary and
sufficient condition for an integer modular acyclic additive noise (IMAN) of
two variables. In addition, we relate bivariate and multivariate causal
identifiability in a more explicit manner, and develop a practical algorithm to
find the order of variables and their parent sets. We demonstrate its
performance in applications to artificial data and real world body motion data
with comparisons to conventional methods.


title: Origin of gamma-ray emission in the shell of Cassiopeia A

abstract:
  Non-thermal X-ray emission from the shell of Cassiopeia A (Cas A) has been an
interesting subject of study, as it provides information about relativistic
electrons and their acceleration mechanisms in the shocks. Chandra X-ray
observatory revealed the detailed spectral and spatial structure of this SNR in
X-rays. The spectral analysis of Chandra X-ray data of Cas A shows unequal flux
levels for different regions of the shell, which can be attributed to different
magnetic fields in those regions. Additionally, the GeV gamma-ray emission
observed by Large Area Telescope on board Fermi Gamma Ray Space Telescope
showed that the hadronic processes are dominating in Cas A, a clear signature
of acceleration of protons. In this paper we aim to explain the GeV-TeV
gamma-ray data in the context of both leptonic and hadronic scenario. We
modeled the multi-wavelength spectrum of Cas A. We use synchrotron emission
process to explain the observed non-thermal X-ray fluxes from different regions
of the shell. These result in estimation of the model parameters, which are
then used to explain TeV gamma-ray emission spectrum. We also use hadronic
scenario to explain both GeV and TeV fluxes simultaneously. We show that a
leptonic model alone cannot explain the GeV-TeV data. Therefore, we need to
invoke a hadronic model to explain the observed GeV-TeV fluxes. We found that
although pure hadronic model is able to explain the GeV-TeV data, a
lepto-hadronic model provides the best fit to the data.


title: The Ellipsoidal Universe in the Planck Satellite Era

abstract:
  Recent Planck data confirm that the cosmic microwave background displays the
quadru-pole power suppression together with large scale anomalies. Progressing
from previous results, that focused on the quadrupole anomaly, we strengthen
the proposal that the slightly anisotropic ellipsoidal universe may account for
these anomalies. We solved at large scales the Boltzmann equation for the
photon distribution functions by taking into account both the effects of the
inflation produced primordial scalar perturbations and the anisotropy of the
geometry in the ellipsoidal universe. We showed that the low quadrupole
temperature correlations allowed us to fix the eccentricity at decoupling,
$e_{\rm dec} \, = \, (0.86 \, \pm \, 0.14) \, 10^{-2}$, and to constraint the
direction of the symmetry axis. We found that the anisotropy of the geometry of
the universe contributes only to the large scale temperature anisotropies
without affecting the higher multipoles of the angular power spectrum.
Moreover, we showed that the ellipsoidal geometry of the universe induces
sizable polarization signal at large scales without invoking the reionization
scenario. We explicitly evaluated the quadrupole TE and EE correlations. We
found an average large scale polarization $\Delta T_{pol} \, = \, (1.20 \, \pm
\, 0.38) \; \mu K $. We point out that great care is needed in the experimental
determination of the large-scale polarization correlations since the average
temperature polarization could be misinterpreted as foreground emission
leading, thereby, to a considerable underestimate of the cosmic microwave
background polarization signal.


title:
The effective resistance of the $N$-cycle graph with four nearest
  neighbors

abstract:
  The exact expression for the effective resistance between any two vertices of
the $N$-cycle graph with four nearest neighbors $C_{N}(1,2)$, is given. It
turns out that this expression is written in terms of the effective resistance
of the $N$-cycle graph $C_{N}$, the square of the Fibonacci numbers, and the
bisected Fibonacci numbers. As a consequence closed form formulas for the total
effective resistance, the first passage time (FPT), and the mean first passage
time (MFPT) for the simple random walk on the the $N$-cycle graph with four
nearest neighbors are obtained. Finally, a closed form formula for the
effective resistance of $C_{N}(1,2)$ with all first neighbors removed is
obtained.


title: Generalized almost paracontact structures

abstract:
  The notion of generalized almost paracontact structure on the generalized
tangent bundle $TM\oplus T^*M$ is introduced and its properties are
investigated. The case when the manifold $M$ carries an almost paracontact
metric structure is also discussed. Conditions for its transformed under a
$\beta$- or a $B$-field transformation to be also a generalized almost
paracontact structure are given. Finally, the normality of a generalized almost
paracontact structure is defined and a characterization of a normal generalized
almost paracontact structure induced by an almost paracontact one is given.


title:
The Continuum Emission Spectrum of Hf 2-2 near the Balmer Limit and the
  ORL versus CEL abundance and temperature Discrepancy

abstract:
  The continuum spectrum of the planetary nebula Hf 2-2 close to the Balmer
discontinuity is modeled in the context of the long standing problem of the
abundance and temperature discrepancy found when analyzing optical
recombination lines and collisionally excited forbidden lines in nebulae.
Models are constructed using single and double Maxwell-Boltzmann distributions
as well as kappa-distributions for the energies of the free electrons. New
results for the necessary continuum and line emission coefficients are
presented calculated with kappa-distributed energies. The best fit to the
observed continuum spectrum is found to be a model comprising two components
with dramatically different temperatures and with a Maxwell-Boltzmann
distribution of electron energies. On the basis of a chi-squared analysis, this
model is strongly favored over a model with kappa-distributed electron
energies.


title:
Robustness of the filamentation instability in arbitrarily oriented
  magnetic field: Full 3D calculation

abstract:
  The filamentation (Weibel) instability plays a key role in the formation of
collisionless shocks which are thought to produce Gamma-Ray-Bursts and
High-Energy-Cosmic-Rays in astrophysical environments. While it has been known
for long that a flow-aligned magnetic field can completely quench the
instability, it was recently proved in 2D that in the cold regime, such
cancelation is possible if and only if the field is perfectly aligned. Here,
this result is finally extended to a 3D geometry. Calculations are conducted
for symmetric and asymmetric counter-streaming relativistic plasma shells. 2D
results are retrieved in 3D: the instability can never be completely canceled
for an oblique magnetic field. In addition, the maximum growth-rate is always
larger for wave vectors lying in the plan defined by the flow and the oblique
field. On the one hand, this bears consequences on the orientation of the
generated filaments. On the other hand, it certifies 2D simulations of the
problem can be performed without missing the most unstable filamentation modes.


title:
Enhancing Template Security of Face Biometrics by Using Edge Detection
  and Hashing

abstract:
  In this paper we address the issues of using edge detection techniques on
facial images to produce cancellable biometric templates and a novel method for
template verification against tampering. With increasing use of biometrics,
there is a real threat for the conventional systems using face databases, which
store images of users in raw and unaltered form. If compromised not only it is
irrevocable, but can be misused for cross-matching across different databases.
So it is desirable to generate and store revocable templates for the same user
in different applications to prevent cross-matching and to enhance security,
while maintaining privacy and ethics. By comparing different edge detection
methods it has been observed that the edge detection based on the Roberts Cross
operator performs consistently well across multiple face datasets, in which the
face images have been taken under a variety of conditions. We have proposed a
novel scheme using hashing, for extra verification, in order to harden the
security of the stored biometric templates.


title:
Laterally-confined two-dimensional electron gases in self-patterned
  LaAlO3/SrTiO3 interfaces

abstract:
  A bottom-up process has been used to engineer the LaAlO3/SrTiO3 interface
atomic composition and locally confine the two-dimensional electron gas to
lateral sizes in the order of 100 nm. This is achieved by using SrTiO3(001)
substrate surfaces with self-patterned chemical termination, which is
replicated by the LaAlO3 layer, resulting in a modulated LaO/TiO2 and AlO2/SrO
interface composition. We demonstrate the confinement of the conducting
interface forming either long-range ordered nanometric stripes or isolated
regions. Our results demonstrate that engineering the interface chemical
termination is a suitable strategy towards nanoscale lateral confinement of
two-dimensional high-mobility systems.


title:
Relation between the charge/discharge processes of dust particles and
  the dynamics of dust clouds over the Moon surface

abstract:
  It is shown that the appearance of lunar horizon glow and streamers observed
above the lunar terminator described by the dynamic fountain mode byl Stubbs et
al. (2006) requires a value of dust particles charge several orders exceed what
they obtain on the Lunar surface. To obtain a sufficient charge due to a
departure of photoelectrons separated submicron particles have to flow over the
surface during tens of seconds or even several minutes. Therefore for emergence
of dust streamers at the lunar sunrise it is necessary that dust particles do
not lose the positive charge during a night.


title: Experimental Feed-Forward Control of the Backwards-Facing Step Flow

abstract:
  Closed-loop control of an amplifier flow is experimentally investigated. A
feed-forward algorithm is implemented to control the flow downstream a
backward-facing step. Upstream and downstream data are extracted from real-time
velocity fields to compute an ARMAX model used to effect actuation. This work,
done at Reynolds number 430 investigates the practical feasibility of this
approach which has shown great promise in a recent numerical study by Herv\'e
et al (2012). The linear nature of the regime is checked, 2D upstream
perturbations are introduced, and the degree to which the flow can be
controlled is quantified. The resulting actuation is able to effectively reduce
downstream energy levels and fluctuations. The limitations and difficulties of
applying such an approach to an experiment are also emphasized.


title: Causal Discovery in a Binary Exclusive-or Skew Acyclic Model: BExSAM

abstract:
  Discovering causal relations among observed variables in a given data set is
a major objective in studies of statistics and artificial intelligence.
Recently, some techniques to discover a unique causal model have been explored
based on non-Gaussianity of the observed data distribution. However, most of
these are limited to continuous data. In this paper, we present a novel causal
model for binary data and propose an efficient new approach to deriving the
unique causal model governing a given binary data set under skew distributions
of external binary noises. Experimental evaluation shows excellent performance
for both artificial and real world data sets.


title:
The thermodynamics of hydride precipitation: the importance of entropy,
  enthalpy and disorder

abstract:
  The thermodynamics of H/{\alpha}-Zr solid solution and zirconium hydride
phases were studied using density functional theory. Disorder in {\zeta},
{\gamma} and {\delta} hydrides and solid solutions were modelled using a
statistically significant number of randomly generated structures in
combination with special quasi-random structures and solid solutions with a
range of concentrations. This is used in conjunction with a calculation of
thermodynamic parameters of the system, including the temperature dependent
sensible enthalpy, configurational entropy and vibrational entropy of the
different crystals in the system, developed from phonon density of states. It
was found that precipitation of hydrides is not thermodynamically favourable
for Zr-H solid solutions containing less than 300 ppm H, suggesting that a
mechanism must cause local concentration of H atoms to a greater amount than
found globally in experimental samples containing hydrides. Temperature drives
the reaction in the direction of solution, primarily due to entropic effects.
Generally, {\gamma} hydride is the most stable phase, although it is very close
in energy to the {\delta}-phase. The sensible enthalpy of precipitation assists
in stabilising HCP hydrides, and the configurational entropy change during
precipitation favours FCC hydrides. None of the thermodynamic contributions are
found to be negligible in driving precipitation.


title:
Specification of the State Lifetime in the DEVS Formalism by Fuzzy
  Controller

abstract:
  This paper aims to develop a new approach to assess the duration of state in
the DEVS formalism by fuzzy controller. The idea is to define a set of fuzzy
rules obtained from observers or expert knowledge and to specify a fuzzy model
which computes this duration, this latter is fed into the simulator to specify
the new value in the model. In conventional model, each state is defined by a
mean lifetime value whereas our method, calculates for each state the new
lifetime according to inputs values. A wildfire case study is presented at the
end of the paper. It is a challenging task due to its complex behavior,
dynamical weather condition, and various variables involved. A global
specification of the fuzzy controller and the forest fire model are presented
in the DEVS formalism and comparison between conventional and fuzzy method is
illustrated.


title:
Tsallis statistics approach to the transverse momentum distributions in
  p-p collisions

abstract:
  Transverse momentum distributions of negatively charged pions produced in p-p
interactions at beam momenta 20, 31, 40, 80 and 158 GeV/c are studied using the
Tsallis distribution as a parametrization. Results are compared with higher
energies data and changes of parameters with energy are determined. Different
Tsallis-like distributions are compared.


title: The Euler valuation on MV-algebras

abstract:
  Every finitely presented MV-algebra A has a unique idempotent valuation E
assigning value 1 to every basic element of A. For each element a of A, E(a)
turns out to coincide with the Euler characteristic of the open set of maximal
ideals m of A such that a/m is nonzero.


title: Tracing sunspot groups to determine angular momentum transfer on the Sun

abstract:
  The goal of this paper is to investigate Reynolds stresses and to check if it
is plausible that they are responsible for angular momentum transfer toward the
solar equator. We also analysed meridional velocity, rotation velocity
residuals and correlation between the velocities. We used sunspot groups
position measurements from GPR (Greenwich Photographic Result) and
SOON/USAF/NOAA (Solar Observing Optical Network/United States Air
Force/National Oceanic and Atmospheric Administration) databases covering the
period from 1878 until 2011. In order to calculate velocities we used daily
motion of sunspot groups. The sample was also limited to $\pm$58\degr in
Central Meridian Distance (CMD) in order to avoid solar limb effects. We mainly
investigated velocity patterns depending on solar cycle phase and latitude. We
found that meridional motion of sunspot groups is toward the centre of activity
from all available latitudes and in all phases of the solar cycle. The range of
meridional velocities is $\pm10$ m s$^{-1}$. Horizontal Reynolds stress is
negative at all available latitudes and indicates that there is a minimum value
($q\approx$ - 3000 m$^2$ s$^{-2}$) located at $b\approx\pm$30$^{0}$. In our
convention this means that angular momentum is transported toward the solar
equator in agreement with the observed rotational profile of the Sun.


title: A Generalization of a Minimal Problem of Korkin-Zolotarev kind

abstract:
  This is an English translation of the paper in which N. I. Akhiezer
discovered his famous orthogonal polynomials on two intervals in a connection
with a generalization of the Korkin-Zolotarev (Korkine-Zolotaref) problem (see
the small commentary by P. Yuditskii, attached to the current publication).
Translated from German by F. Puchhammer.


title:
Hole burning and higher order photon effects in attosecond light-atom
  interaction

abstract:
  We have performed calculations of attosecond laser-atom interactions for
laser intensities where interesting two and three photon effects become
relevant. In particular, we examine the case of "hole burning" in the initial
orbital. Hole burning is present when the laser pulse duration is shorter than
the classical radial period because the electron preferentially absorbs the
photon near the nucleus. We also examine how 3 photon Raman process can lead to
a time delay in the outgoing electron for the energy near one photon
absorption. For excitation out of the hydrogen $2s$ state, an intensity of
$2.2\times 10^{16}$ W/cm$^2$ leads to a 6 attosecond delay of the outgoing
electron. We argue that this delay is due to the hole burning in the initial
state.


title:
A new keyphrases extraction method based on suffix tree data structure
  for arabic documents clustering

abstract:
  Document Clustering is a branch of a larger area of scientific study known as
data mining .which is an unsupervised classification using to find a structure
in a collection of unlabeled data. The useful information in the documents can
be accompanied by a large amount of noise words when using Full Text
Representation, and therefore will affect negatively the result of the
clustering process. So it is with great need to eliminate the noise words and
keeping just the useful information in order to enhance the quality of the
clustering results. This problem occurs with different degree for any language
such as English, European, Hindi, Chinese, and Arabic Language. To overcome
this problem, in this paper, we propose a new and efficient Keyphrases
extraction method based on the Suffix Tree data structure (KpST), the extracted
Keyphrases are then used in the clustering process instead of Full Text
Representation. The proposed method for Keyphrases extraction is language
independent and therefore it may be applied to any language. In this
investigation, we are interested to deal with the Arabic language which is one
of the most complex languages. To evaluate our method, we conduct an
experimental study on Arabic Documents using the most popular Clustering
approach of Hierarchical algorithms: Agglomerative Hierarchical algorithm with
seven linkage techniques and a variety of distance functions and similarity
measures to perform Arabic Document Clustering task. The obtained results show
that our method for extracting Keyphrases increases the quality of the
clustering results. We propose also to study the effect of using the stemming
for the testing dataset to cluster it with the same documents clustering
techniques and similarity/distance measures.


title: Global Far-Ultraviolet Properties of the Cygnus Loop

abstract:
  We present the C III {\lambda}977, O VI {\lambda}{\lambda}1032, 1038 and N
IV] {\lambda}1486 emission line maps of the Cygnus Loop, obtained with the
newly processed data of Spectroscopy of Plasma Evolution from Astrophysical
Radiation (SPEAR; also known as FIMS) mission. In addition, the Si IV+O IV]
line complexes around 1400 {\AA} are resolved into two separate emission lines,
whose intensity demonstrates a relatively high Si IV region predicted in the
previous study. The morphological similarity between the O VI and X-ray images,
as well as a comparison of the O VI intensity with the value expected from the
X-ray results, indicates that large portions of the observed O VI emissions
could be produced from X-ray emitting gas. Comparisons of the far-ultraviolet
(FUV) images with the optical and H I 21 cm images, reveal spatial variations
of shock-velocity populations and high FUV extinction in the direction of a
previously identified H I cloud. By calculating the FUV line ratios for several
subregions of the Cygnus Loop, we investigate the spatial variation of the
population of radiative shock velocities; and the effects of resonance
scattering, X-ray emitting gas, and non-radiative shocks. The FUV and X-ray
luminosity comparisons between the Cygnus Loop and the Vela supernova remnant
suggest that the fraction of shocks in the early evolutionary stages is much
larger in the Cygnus Loop.