title:
Phase Stability in the Two dimensional Anisotropic Boson Hubbard
  Hamiltonian

abstract:
  The two dimensional square lattice hard-core boson Hubbard model with near
neighbor interactions has a `checkerboard' charge density wave insulating phase
at half-filling and sufficiently large intersite repulsion. When doped, rather
than forming a supersolid phase in which long range charge density wave
correlations coexist with a condensation of superfluid defects, the system
instead phase separates. However, it is known that there are other lattice
geometries and interaction patterns for which such coexistence takes place. In
this paper we explore the possibility that anisotropic hopping or anisotropic
near neighbor repulsion might similarly stabilize the square lattice
supersolid. By considering the charge density wave structure factor and
superfluid density for different ratios of interaction strength and
hybridization in the $\hat x$ and $\hat y$ directions, we conclude that phase
separation still occurs.


title:
Observation of the ghost critical field for superconducting fluctuations
  in a disordered TaN thin film

abstract:
  We experimentally study the ghost critical field (GCF), a magnetic field
scale for the suppression of superconducting fluctuations, using Hall effect
and magnetoresistance measurements on a disordered superconducting thin film
near its transition temperature $T_c$. We observe an increase in the Hall
effect with a maximum in field that tracks the upper critical field below
$T_c$, vanishes near $T_c$, and returns to higher fields above $T_c$. Such a
maximum has been observed in studies of the Nernst effect and identified as the
GCF. Magnetoresistance measurements near $T_c$ indicate quenching of
superconducting fluctuations, agree with established theoretical descriptions,
and allow us to extract the GCF and other parameters. Above $T_c$ the Hall peak
field is quantitatively distinct from the GCF, and we contrast this finding
with ongoing studies of the Nernst effect and superconducting fluctuations in
unconventional and thin-film superconductors.


title:
Photoacoustic Tomography using a Michelson Interferometer with
  Quadrature Phase Detection

abstract:
  We present a pressure sensor based on a Michelson interferometer, for use in
photoacoustic tomography. Quadrature phase detection is employed allowing
measurement at any point on the mirror surface without having to retune the
interferometer, as is typically required by Fabry-Perot type detectors. This
opens the door to rapid full surface detection, which is necessary for clinical
applications. Theory relating acoustic pressure to detected acoustic particle
displacements is used to calculate the detector sensitivity, which is validated
with measurement. Proof-of-concept tomographic images of blood vessel phantoms
have been taken with sub-millimeter resolution at depths of several
millimeters.


title:
Has your organization compliance with ISMS? A case study in an Iranian
  Bank

abstract:
  The purpose of this study is proposing a model to determine the gaps between
security standards requirements and the reality of implementation ISMS. The
research approach analyzes the various industry standards relevant to
information security and responses gained from interviewing with 45 individuals
of IT professionals and information security experts (who are chosen with
targeted sampling) in order to develop a model comprising factors and
subfactors which assesses compliance with ISMS (Information Security Management
System) in organizations. For hypothesis test, binomial test and for ranking of
factors and sub factors, Friedman test was done. This model tested in a bank
and the degree of compliance with ISMS calculated.


title: Radiation Mechanism of the Soft Gamma-ray Pulsar PSR B1509-58

abstract:
  The outer gap model is used here to explain the spectrum and the energy
dependent light curves of the X-ray and soft gamma-ray radiations of the
spin-down powered pulsar PSR B1509-58.In the outer gap model, most pairs inside
the gap are created around the null charge surface and the gap's electric field
separates the two charges to move in opposite directions. Consequently, the
region from the null charge surface to the light cylinder is dominated by the
outflow of particles and that from the null charge surface to the star is
dominated by the inflow of particles. The inflow and outflow of particles move
along the magnetic field lines and emit curvature photons, and the incoming
curvature photons are converted to pairs by the strong magnetic field of the
star. These pairs emit synchrotron photons. We suggest that the X-rays and soft
gamma-rays of PSR B1509-58 result from the synchrotron radiation of these
pairs, and the viewing angle of PSR B1509-58 only receives the inflow
radiation. The magnetic pair creation requires a large pitch angle, which makes
the pulse profile of the synchrotron radiation distinct from that of the
curvature radiation. We carefully trace the pulse profiles of the synchrotron
radiation with different pitch angles. We find that the differences between the
light curves of different energy bands are due to the different pitch angles of
the secondary pairs, and the second peak appearing at E>10MeV comes from the
region near the star, where the stronger magnetic field allows the pair
creation to happen with a smaller pitch angle.


title: Radiative generation of metastable minima in a scalar-fermion model

abstract:
  I consider a theory of a real scalar and a fermion field, with a Yukawa
interaction and a potential term that admits two degenerate minima at the tree
level. The quantum vacuum energy difference between these two vacua can be
calculated using the renormalization group improved effective potential, and
gives a finite, nonzero result, dependent on the relative strength of the
scalar and the Yukawa interactions.


title:
Neutral defects in SrTiO3 studied with screened hybrid density
  functional theory

abstract:
  The properties of neutral defects in SrTiO3 are calculated using the screened
hybrid density functional of Heyd, Scuseria, and Ernzerhof. The formation
energies, the crystal field splittings affecting the SrTiO3 band structure, and
the relaxation geometries around each defect are discussed. Oxygen vacancies
introduced in SrTiO3 are found to cause a small tetragonal elongation of the
lattice along the z-axis. The resulting conduction band minimum electron
effective masses deviate from the bulk values and support the proposal of
enhanced electron mobility along the direction of the compressive strain. The
locations of the various defect bands within the SrTiO3 gap are estimated
without introducing any post hoc corrections, thus allowing a more reliable
comparison with experiment.


title: Local dynamics of intersections: V. I. Arnold's theorem revisited

abstract:
  V. I. Arnold proved in 1991 (published in 1993) that the intersection
multiplicity between two germs of analytic subvarieties at a fixed point of a
holomorphic invertible self-map remains bounded when one of the germs is
dragged by iterations of the self map. The proof is based on the
Skolem-Mahler-Lech theorem on zeros in recurrent sequences.
  We give a different proof, based on the Noetherianity of certain algebras,
which allows to generalize the Arnold's theorem for local actions of arbitrary
finitely generated commutative groups, both with discrete and infinitesimal
generators. Simple examples show that for non-commutative groups the analogous
assertion fails.


title: On a family of diamond-free strongly regular graphs

abstract:
  The existence of a partial quadrangle ${\mathsf{PQ}}(s, t, \mu)$ is
equivalent to the existence of a diamond-free strongly regular graph
${\mathsf{SRG}}(1+s(t+1)+s^2t(t+1)/\mu, s(t+1), s-1, \mu)$. Recently, it is
shown that there exists a ${\mathsf{PQ}}(2, (n^3+3n^2-2)/2, n^2+n)$ if and only
if $n\in\{1, 2, 4\}$. Let $\mathcal{S}$ be a ${\mathsf{PQ}}(3,(n+3)(n^2-1)/3,
n^2+n)$ such that for every two non-collinear points $p_1$ and $p_2$, there is
a point $q$ non-collinear with $p_1$, $p_2$, and all points collinear with both
$p_1$ and $p_2$. In this article, we establish that $\mathcal{S}$ exists only
for $n\in\{-2, 2, 3\}$ and probably $n=10$.


title: Ramsey numbers for multiple copies of hypergraphs

abstract:
  In this paper, for sufficiently large $n$ we determine the Ramsey number
$R(G,nH)$ where $G$ is a $k$-uniform hypergraph with the maximum independent
set that intersects each of the edges in $k-1$ vertices and $H$ is a
$k$-uniform hypergraph with a vertex so that the hypergraph induced by the
edges containing this vertex is a star. There are several examples for such $G$
and $H$, among them are any disjoint union of $k$-uniform hypergraphs involving
loose paths, loose cycles, tight paths, tight cycles with a multiple of $k$
edges, stars, Kneser hypergraphs and complete $k$-uniform $k$-partite
hypergraphs for $G$ and linear hypergraphs for $H$. As an application,
$R(mG,nH)$ is determined where $m$ or $n$ is large and $G$ and $H$ are either
loose paths, loose cycles, tight paths, or stars. Also, $R(G,nH)$ is determined
when $G$ is a bipartite graph with a matching saturating one of its color
classes and $H$ is an arbitrary graph for sufficiently large $n$. Moreover,
some bounds are given for $R(mG,nH)$ which allow us to determine this Ramsey
number when $m\geq n$ and $G$ and $H$, $(|V(G)|\geq |V(H)|)$, are 3-uniform
loose paths or cycles, $k$-uniform loose paths or cycles with at most 4 edges
and $k$-uniform stars with 3 edges.


title:
Using new dynamical indicators to distinguish between order and chaos in
  a galactic potential producing exact periodic orbits and chaotic components

abstract:
  The theory of the inverse problem is used in order to find a two dimensional
galactic potential generating a mono-parametric family of elliptic periodic
orbits. The potential is made up of a two-dimensional harmonic oscillator with
perturbing terms of third and fourth degree and can be considered to describe
local motion in the central parts of a barred galaxy. Our numerical
calculations indicate that the potential produces also other families of orbits
and there are cases, where distinct chaotic components are also observed. The
numerical experiments suggest that there are regular as well as chaotic orbits
supporting the barred structure. We use a variety of dynamical indicators, in
order to determine the character of motion. Of significant interest, is the
S(g) dynamical spectrum, which is used in order to identify the islandic motion
of resonant orbits and also proves to be a very useful and fast indicator, in
order to distinguish between regular and chaotic motion. Comparison with other
methods for detecting chaos is also discussed. The present results are compared
with outcomes from earlier work.


title:
A rational galactic potential with accurate periodic orbits and
  quasi-integrals of motion

abstract:
  The motion in a simple, time independent rational galactic potential is
studied. The potential is a generalization of a two dimensional harmonic
oscillator potential and can be considered to describe plane motion in the
central parts of a galaxy. There are cases, where the potential displays
accurate periodic orbits, together with large chaotic regions. The starting
position of these orbits can be found using analytical arguments. Using a
quasi-integral of motion, we study the stability of the central periodic orbit
and explain the degree of chaos in the inner regions of the galaxy. Our
outcomes are compared with results coming from polynomial potentials with
accurate periodic orbits and large chaotic regions.


title: Clear and Compress: Computing Persistent Homology in Chunks

abstract:
  We present a parallelizable algorithm for computing the persistent homology
of a filtered chain complex. Our approach differs from the commonly used
reduction algorithm by first computing persistence pairs within local chunks,
then simplifying the unpaired columns, and finally applying standard reduction
on the simplified matrix. The approach generalizes a technique by G\"unther et
al., which uses discrete Morse Theory to compute persistence; we derive the
same worst-case complexity bound in a more general context. The algorithm
employs several practical optimization techniques which are of independent
interest. Our sequential implementation of the algorithm is competitive with
state-of-the-art methods, and we improve the performance through parallelized
computation.


title: Monomial Testing and Applications

abstract:
  In this paper, we devise two algorithms for the problem of testing
$q$-monomials of degree $k$ in any multivariate polynomial represented by a
circuit, regardless of the primality of $q$. One is an $O^*(2^k)$ time
randomized algorithm. The other is an $O^*(12.8^k)$ time deterministic
algorithm for the same $q$-monomial testing problem but requiring the
polynomials to be represented by tree-like circuits. Several applications of
$q$-monomial testing are also given, including a deterministic $O^*(12.8^{mk})$
upper bound for the $m$-set $k$-packing problem.


title:
Scale Selection of Adaptive Kernel Regression by Joint Saliency Map for
  Nonrigid Image Registration

abstract:
  Joint saliency map (JSM) [1] was developed to assign high joint saliency
values to the corresponding saliency structures (called Joint Saliency
Structures, JSSs) but zero or low joint saliency values to the outliers (or
mismatches) that are introduced by missing correspondence or local large
deformations between the reference and moving images to be registered. JSM
guides the local structure matching in nonrigid registration by emphasizing
these JSSs' sparse deformation vectors in adaptive kernel regression of
hierarchical sparse deformation vectors for iterative dense deformation
reconstruction. By designing an effective superpixel-based local structure
scale estimator to compute the reference structure's structure scale, we
further propose to determine the scale (the width) of kernels in the adaptive
kernel regression through combining the structure scales to JSM-based scales of
mismatch between the local saliency structures. Therefore, we can adaptively
select the sample size of sparse deformation vectors to reconstruct the dense
deformation vectors for accurately matching the every local structures in the
two images. The experimental results demonstrate better accuracy of our method
in aligning two images with missing correspondence and local large deformation
than the state-of-the-art methods.


title: Observations of SN2011fe with INTEGRAL

abstract:
  SN2011fe was detected by the Palomar Transient Factory on August 24th 2011 in
M101 few hours after the explosion. From the early spectra it was immediately
realized that it was a Type Ia supernova thus making this event the brightest
one discovered in the last twenty years. In this paper the observations
performed with the instruments on board of INTEGRAL (SPI, IBIS/ISGRI, JEM-X and
OMC) before and after the maximum of the optical light as well as the
interpretation in terms of the existing models of $\gamma$--ray emission from
such kind of supernovae are reported. All INTEGRAL high-energy have only been
able to provide upper limits to the expected emission due to the decay of
$^{56}$Ni. These bounds allow to reject explosions involving a massive white
dwarf in the sub--Chandrasekhar scenario. On the other hand, the optical light
curve obtained with the OMC camera suggests that the event was produced by a
delayed detonation of a CO white dwarf that produced $\sim 0.5$ M$\odot$ of
$^{56}$Ni. In this particular case, INTEGRAL would have only been able to
detect the early $\gamma$--ray emission if the supernova had occurred at a
distance of 2 -3 Mpc, although the brightest event could be visible up to
distances larger by a factor two.


title: Situation-Aware Approach to Improve Context-based Recommender System

abstract:
  In this paper, we introduce a novel situation aware approach to improve a
context based recommender system. To build situation aware user profiles, we
rely on evidence issued from retrieval situations. A retrieval situation refers
to the social spatio temporal context of the user when he interacts with the
recommender system. A situation is represented as a combination of social
spatio temporal concepts inferred from ontological knowledge given social
group, location and time information. User's interests are inferred from past
user's interaction with the recommender system related to the identified
situations. They are represented using concepts issued from a domain ontology.
We also propose a method to dynamically adapt the system to the user's
interest's evolution.


title:
Nevanlinna-Pick problem and uniqueness of left inverses in convex
  domains, symmetrized bidisc and tetrablock

abstract:
  In the paper we discuss the problem of uniqueness of left inverses (solutions
of two point Nevanlinna-Pick problem) in bounded convex domains, strongly
linearly convex domains, the symmetrized bidisc and the tetrablock.


title: Rigid particle revisited: extrinsic curvature yields the Dirac equation

abstract:
  We reexamine the model of relativistic particle with higher-derivative term
linear on the first extrinsic curvature (rigidity). The passage from classical
to quantum theory requires a number of rather unexpected steps which we report
here. We found that, contrary to common opinion, quantization of the model in
terms of $so(3.2)$-algebra yields massive Dirac equation.


title: Onomastics 2.0 - The Power of Social Co-Occurrences

abstract:
  Onomastics is "the science or study of the origin and forms of proper names
of persons or places." ["Onomastics". Merriam-Webster.com, 2013.
http://www.merriam-webster.com (11 February 2013)]. Especially personal names
play an important role in daily life, as all over the world future parents are
facing the task of finding a suitable given name for their child. This choice
is influenced by different factors, such as the social context, language,
cultural background and, in particular, personal taste.
  With the rise of the Social Web and its applications, users more and more
interact digitally and participate in the creation of heterogeneous,
distributed, collaborative data collections. These sources of data also reflect
current and new naming trends as well as new emerging interrelations among
names.
  The present work shows, how basic approaches from the field of social network
analysis and information retrieval can be applied for discovering relations
among names, thus extending Onomastics by data mining techniques. The
considered approach starts with building co-occurrence graphs relative to data
from the Social Web, respectively for given names and city names. As a main
result, correlations between semantically grounded similarities among names
(e.g., geographical distance for city names) and structural graph based
similarities are observed.
  The discovered relations among given names are the foundation of "nameling"
[http://nameling.net], a search engine and academic research platform for given
names which attracted more than 30,000 users within four months,
underpinningthe relevance of the proposed methodology.


title:
Optimizing an Utility Function for Exploration / Exploitation Trade-off
  in Context-Aware Recommender System

abstract:
  In this paper, we develop a dynamic exploration/ exploitation (exr/exp)
strategy for contextual recommender systems (CRS). Specifically, our methods
can adaptively balance the two aspects of exr/exp by automatically learning the
optimal tradeoff. This consists of optimizing a utility function represented by
a linearized form of the probability distributions of the rewards of the
clicked and the non-clicked documents already recommended. Within an offline
simulation framework we apply our algorithms to a CRS and conduct an evaluation
with real event log data. The experimental results and detailed analysis
demonstrate that our algorithms outperform existing algorithms in terms of
click-through-rate (CTR).


title: Holomorphic jets in symplectic manifolds

abstract:
  We define pointwise partial differential relations for holomorphic discs.
Given a relative homotopy class, a relation, and a generic almost complex
structure we provide the moduli space of discs which have an injective point
with the structure of a smooth manifold. Applications to the local behaviour
are given and an adjunction inequality for singularities is derived. Moreover,
we show that for a coordinate class of a monotone Lagrangian split torus
generically the number of non-immersed holomorphic discs is even.


title:
The dynamic conductivity of strongly non-ideal plasmas: is the Drude
  model valid?

abstract:
  The method of moments is used to calculate the dynamic conductivity of
strongly coupled fully ionized hydrogen plasmas. The electron density $n_{e}$
and temperature $T$ vary in the domains $ 10^{21} < n_{e} < 10^{24} {\rm
cm}^{-3}$, $10^{4} {\rm K} < T < 10^{6} {\rm K}$. The results are compared to
some theoretical data.


title:
The effect of fluctuations - thermal and otherwise - on the temperature
  dependence of thermopower in aromatic chain single-molecule junctions

abstract:
  We report a theoretical study of the thermopower of single-molecule
junctions, with focus on phenyl-based molecular junctions. In contrast to prior
studies, thermal fluctuations of the torsional angle between the phenyl rings
and variations in the position of the molecular level alignment with respect to
the electrode Fermi energy were both taken into account. Full thermopower
histograms were obtained, and their dependence on the magnitude of the
fluctuations was studied. We found that at large molecular orbital variations
the thermopower becomes strongly dependent on the torsion angle and can even
change sign. This results in a marked effect of fluctuations on the thermopower
distribution, yielding an average thermopower at high temperatures that differs
(smaller or larger) from the fluctuation-free value, depending on the strength
of fluctuations. We therefore conclude that fluctuations should be taken into
account both when extracting single-molecule parameters, such as the molecular
level-Fermi level offset, and in predictions of the thermopower of molecular
junctions.


title: A Semantic approach for effective document clustering using WordNet

abstract:
  Now a days, the text document is spontaneously increasing over the internet,
e-mail and web pages and they are stored in the electronic database format. To
arrange and browse the document it becomes difficult. To overcome such problem
the document preprocessing, term selection, attribute reduction and maintaining
the relationship between the important terms using background knowledge,
WordNet, becomes an important parameters in data mining. In these paper the
different stages are formed, firstly the document preprocessing is done by
removing stop words, stemming is performed using porter stemmer algorithm, word
net thesaurus is applied for maintaining relationship between the important
terms, global unique words, and frequent word sets get generated, Secondly,
data matrix is formed, and thirdly terms are extracted from the documents by
using term selection approaches tf-idf, tf-df, and tf2 based on their minimum
threshold value. Further each and every document terms gets preprocessed, where
the frequency of each term within the document is counted for representation.
The purpose of this approach is to reduce the attributes and find the effective
term selection method using WordNet for better clustering accuracy. Experiments
are evaluated on Reuters Transcription Subsets, wheat, trade, money grain, and
ship, Reuters 21578, Classic 30, 20 News group (atheism), 20 News group
(Hardware), 20 News group (Computer Graphics) etc.


title:
A Gaps Approach to Access the Efficiency and Effectiveness of
  IT-Initiatives In Rural Areas: case study of Samalta, a village in the
  central Himalayan Region of India

abstract:
  This paper focuses on the effectiveness and efficiency of IT initiatives in
rural areas where topology creates isolation to developmental activities. A
village is selected for the study and information is gathered through
interviews of village dwellers. These collected responses are then analyzed and
a gaps model is proposed.


title: Complementary role of the pressure in the black hole thermodynamics

abstract:
  In black hole thermodynamics of certain models, the thermodynamic first law
may contain the pressure term. The corresponding entropy follows the area law
whereas the thermodynamic energy is not the same with the black hole mass. If
the pressure can be decomposed into two parts and recombined with the original
thermodynamic quantities, then the thermodynamic energy becomes the black hole
mass and the entropy satisfying the area law turns out to be the corrected
entropy called the Wald entropy, respectively.


title: From individual to strongly coupled metallic nanocavities

abstract:
  Localized plasmonic modes of metallic nanoparticles may hybridize like those
of atoms forming a molecule. However, the rapid decay of the plasmonic fields
outside the metal severely limits the range of these interactions to tens of
nanometers. Herein, we demonstrate very strong coupling of nanocavities in
metal films, sparked by propagating surface plasmons and evident even at much
larger distances of hundreds of nanometers for the properly selected
metal/wavelength combination. Such strong coupling drastically changes the
symmetry of the charge distribution around the nanocavities making it amenable
to probing by the nonlinear optical response of the medium. We show that when
strongly coupled, equilateral triangular nanocavities lose their individual
three-fold symmetry to adopt the lower symmetry of the coupled system and then
respond like a single dipolar entity. A quantitative model is suggested for the
transition from individual to strongly coupled nanocavities.


title:
Perfect Echo HMQC: Sensitivity and Resolution Enhancement by Broadband
  Homonuclear Decoupling

abstract:
  Homonuclear 1H-1H J-modulation leads to J-multiplets in F1 dimension of 2D
1H-13C HMQC spectra. This hampers unambiguous signal assignment for overcrowded
13C spectra. Broadband homonuclear decoupling has been achieved in the indirect
t1 evolution period by incorporating blocks of perfect echo. This method
enhances resolution and sensitivity of 2D 1H-13C HMQC spectra. The results on
Cyclosporine demonstrate that the method is very efficient for -13CH2 groups,
though partial sensitivity and resolution enhancements have also been observed
for -13CH and -13CH3 groups. Interpretation of the result based on product
operator formalism is also given.


title: Barrier properties of k-mer packings

abstract:
  This work discusses numerical studies of the barrier properties of k-mer
packings by Monte Carlo method. The studied variants of regular and non-regular
arrangements on a square lattice included models of random sequential
adsorption (RSA) and random deposition (RD). The discrete problem of diffusion
through the bonds of a square lattice was considered. The k-mers were perfectly
oriented perpendicular to the diffusion direction and blocked certain fraction
of bonds $f_b$ against diffusion. For loose RSA and RD packings, the
percolation like-behavior of diffusion coefficient was observed and the data
evidenced that their barrier properties at large values of k may be more
effective than those of some dense packings. Such anomalous behavior can
reflect the details of k-mer spatial organization (aggregation) and structure
of pores in RD and RSA packings. The contradictions between simulation data and
predictions of EM theory were also discussed.


title: Detecting non-Abelian geometric phase in circuit QED

abstract:
  We propose a scheme for detecting noncommutative feature of the non-Abelian
geometric phase in circuit QED, which involves three transmon qubits
capacitively coupled to an one-dimensional transmission line resonator. By
controlling the external magnetic flux of the transmon qubits, we can obtain an
effective tripod interaction of our circuit QED setup. The noncommutative
feature of the non-Abelian geometric phase is manifested that for an initial
state undergo two specific loops in different order will result in different
final states. Our numerical calculations show that this difference can be
unambiguously detected in the proposed system.


title:
Enhancement of 3rd-harmonics generation during ultrashort pulse
  diffraction in multi-layer volume-grating

abstract:
  Successful phase-matching methods for Third Harmonics Generation (THG)
include phase-matching in birefringent crystal and quasi-phase-matching (QPM)
in crystal with periodically poled domains. However, these methods are not
feasible in some isotropic materials (e.g. fused silica and photosensitive
silicate glass). It was known that volume-grating in isotropic materials can
independently generate frequency-converted waves. One of disadvantages of
single-layer volume-grating is that the brightness of harmonic emission can not
be enhanced by increasing the grating thickness. In this paper, a THG device
with stratified sub-gratings was designed to enhance THG in isotropic
materials: several sub-gratings were arranged parallel, and the grating-figures
misalignment between neighboring sub-gratings was pre-fabricated. In terms of
extension of interaction length in THG, our multi-layer sub-grating is formally
equivalent to the multi-layer periodically poled crystal (e.g. lithium niobate)
in conventional QPM approach. According to the calculation results, the N-layer
(N >2) can, in principle, generate TH output intensity of N*N times stronger
than single-layer volume-grating does, also compared to N times stronger than
N-layer without figures-misalignment. The effect of random fabrication error in
grating thickness on normalized conversion efficiency was discussed.


title: On the structure of isentropes of polynomial maps

abstract:
  The structure of isentropes (i.e. level sets of constant topological entropy)
including the monotonicity of entropy, has been studied for polynomial interval
maps since the 1980s. We show that isentropes of multimodal polynomial families
need not be locally connected and that entropy does in general not depend
monotonically on a single critical value.


title: Double loop quantum enveloping algebras

abstract:
  In this paper we describe certain homological properties and representations
of a two-parameter quantum enveloping algebra $U_{g,h}$ of ${\frak {sl}}(2)$,
where $g,h$ are group-like elements.


title: Some sufficient problems for certain univalent functions

abstract:
  For analytic functions f(z) in the open unit disk U with f(0)=f'(0)-1=0, R.
Singh and S. Singh (Coll. Math. 47(1982), 309-314) have considered some
sufficient problems for f(z) to be univalent in U. The object of the present
paper is to discuss some sufficient problems for f(z) to be some classes of
analytic functions in U.


title: The superconducting state in the B2H6 compound at 360 GPa

abstract:
  In the paper, the thermodynamic properties of the superconducting state in
the $\rm{B_{2}H_{6}}$ compound have been characterized. The pressure of 360 GPa
has been taken into account. The calculations have been carried out in the
framework of the Eliashberg formalism for the wide range of the Coulomb
pseudopotential: $\mu^{\star}\in<0.1,0.3>$. It has been found that the critical
temperature ($T_{C}$) varies in the range from 147 K to 87 K, depending on the
assumed value of the Coulomb pseudopotential. The ratio of the energy gap to
the critical temperature ($R_{\Delta}\equiv 2\Delta(0)/k_{B}T_{C}$)
significantly exceeds the value predicted by the BCS theory:
$R_{\Delta}\in<4.24,3.98>$. In the similar manner behaves the ratio of the
specific heat jump to the heat of the normal state ($R_{C}\equiv\Delta
C(T_{C})/C^{N}(T_{C})$), namely: $R_{C}\in<2.33,2.17>$. The parameter
$R_{H}\equiv T_{C}C^{N}(T_{C})/H^{2}_{C}(0)$, where $H_{C}(0)$ is the
thermodynamic critical field, ranges from 0.144 to 0.168.


title:
Starlikeness and convexity for analytic functions concerned with Jack's
  lemma

abstract:
  There are many results for sufficient conditions of functions f(z) which are
analytic in the open unit disc U to be starlike and convex in U. The object of
the present paper is to derive some interesting sufficient conditions for f(z)
to be starlike of order \alpha\ and convex of order \alpha\ in U concerned with
Jack's lemma. Some examples for our results are also considered with the help
of Mathematica 5.2.


title: Starlikeness of order \alpha\ rerated to Mocanu functions

abstract:
  For analytic functions f(z) in the open unit disk U with f(0)=f'(0)-1=0, P.
T. Mocanu (Mathematica (Cluj), 11(34) (1969)) have considered Mocanu functions.
The object of the present paper is to discuss some sufficient problems for f(z)
to be starlike of order \alpha.


title:
The Weight Distributions of a Class of Cyclic Codes with Three Nonzeros
  over F3

abstract:
  Cyclic codes have efficient encoding and decoding algorithms. The decoding
error probability and the undetected error probability are usually bounded by
or given from the weight distributions of the codes. Most researches are about
the determination of the weight distributions of cyclic codes with few
nonzeros, by using quadratic form and exponential sum but limited to low
moments. In this paper, we focus on the application of higher moments of the
exponential sum to determine the weight distributions of a class of ternary
cyclic codes with three nonzeros, combining with not only quadratic form but
also MacWilliams' identities. Another application of this paper is to emphasize
the computer algebra system Magma for the investigation of the higher moments.
In the end, the result is verified by one example using Matlab.


title: Some sufficient problems for strongly close-to-convex of order \mu

abstract:
  For analytic functions f(z) in the open unit disk U with f(0)=f'(0)-1=0, a
class STC(\mu) is defined. The object of the present paper is to discuss some
sufficient problems for f(z) to be strongly close-to-convex of order \mu\ in U.


title: The Cross Spectral Time lags evolution along branches in XTE J1701-462

abstract:
  We investigate the cross spectrum of XTE J1701-462 in various types of
Neutron Star-Low Mass X-ray Binary subclasses, during its 2006-2007 outburst.
We analyze the relation between the time lags and temporal variabilities. We
find that the hard time lags accompany with the horizontal branch oscillations
(HBOs) and the soft time lags dominate the noise in the low frequency range
0.1-10 Hz on HB. In the Cyg-like phase, the time lags decrease on the middle
normal branch (NB) from HB/NB vertex to NB/FB vertex, whereas the time lags are
roughly invariant in the Sco-like source. We discuss that the Compton
upscattering by the corona introduces the soft lag in low frequency noise. We
interpret that the variation of the Comptonization component from the disk
emission lead to the HBOs' time lags evolution along the Z tracks. We also
report the rms amplitude spectrum and phase lag spectrum for the NBO. The
$\sim$ $160^{\circ}$ phase lag is found. We present that the rms amplitude of
both the Cyg-like and the Sco-like NBO linearly increase with the photon energy
in low energy bands, and it will drop in the highest energy band.


title:
Properties of certain analytic functions associated with two boundary
  points

abstract:
  For analytic functions f(z) in the closed unit disk \bar{U}, two boundary
points z_1 and z_2 such that \alpha = (f'(z_1)+f'(z_2))/2 in f'(U) are
considered. The object of the present paper is to discuss some interesting
conditions for f(z) to be |f'(z)-1|<\rho|1-\alpha| in U with some examples.


title:
A circuit analysis of an in situ tunable radio-frequency quantum point
  contact

abstract:
  A detailed analysis of the tunability of a radio-frequency quantum point
contact setup using a C-LCR circuit is presented. We calculate how the series
capacitance influences resonance frequency and charge-detector resistance for
which matching is achieved as well as the voltage and power delivered to the
load. Furthermore, we compute the noise contributions in the system and compare
our findings with measurements taken with an etched quantum point contact.
While our considerations mostly focus on our specific choice of matching
circuit, the discussion of the influence of source-to-load power transfer on
the signal-to-noise ratio is valid generally.


title: An application of Miller and Mocanu lemma

abstract:
  Let H[a_0,n] be the class of functions f(z)=a_0+a_nz^n+...which are analytic
in the open unit disk U}. For f(z) in H[a_0,n], S. S. Miller and P. T. Mocanu
(J. Math. Anal. Appl. 65(1978), 289-305) have shown Miller and Mocanu lemma
which is the generalization of Jack lemma by I. S. Jack (J. London Math. Soc.
3(1971), 469-474). Applying Miller and Mocanu lemma, an interesting property
for f(z) in H[a_0,n] and an example are discuss.


title:
High spin polarization of the anomalous Hall current in Co-based Heusler
  compounds

abstract:
  Based on first principles density functional calculations of the intrinsic
anomalous and spin Hall conductivities, we predict that the charge Hall current
in Co-based full Heusler compounds Co$_2$XZ (X = Cr and Mn; Z = Al, Si, Ga, Ge,
In and Sn) except Co$_2$CrGa would be almost fully spin-polarized even although
Co$_2$MnAl, Co$_2$MnGa, Co$_2$MnIn and Co$_2$MnSn do not have a half-metallic
band structure. Furthermore, the ratio of the associated spin current to the
charge Hall current is slightly larger than 1.0. This suggests that these
Co-based Heusler compounds, especially Co$_2$MnAl, Co$_2$MnGa and Co$_2$MnIn
which are found to have large anomalous and spin Hall conductivities, might be
called anomalous Hall half-metals and could have valuable applications in
spintronics such as spin valves as well as magnetoresistive and spin-torque
driven nanodevices. These interesting findings are discussed in terms of the
calculated electronic band structures, magnetic moments and also anomalous and
spin Hall conductivities as a function of the Fermi level.


title:
Starlikeness problems for certain analytic functions concerned with
  subordinations

abstract:
  Let A_n be the class of functions f(z) which are analytic in the open unit
disk U} with f(0)=0, f'(0)=1, f"(0)=f"'(0)=...=f^{(n)}=0 and f^{(n+1)}\neq0.
Applying the results due to S. S. Miller (J. Math. Anal. Appl. 65(1978),
289-305), some interesting starlikeness problems concerned with subordinations
are discussed. The results in the paper are extensions of results by M.
Obradovi\'c (Hokkaido Math. J. 27(1998), 329-335).


title: Sufficient conditions for strongly Carath\'eodory functions

abstract:
  Applying the subordination principle for analytic functions in the open unit
disk U, I. H. Kim and N. E. Cho (Comput. Math. Appl. 59(2010), 2067-2073)
considered some sufficient conditions for Carath\'eodory functions. The purpose
of this paper is to discuss some sufficient conditions for the class of
strongly Carath\'eodory functions in U.


title: Some classes of order \alpha\ for second-order differential inequalities

abstract:
  For analytic functions f(z) in the open unit disk U with f(0)=f'(0)-1=0, S.
S. Miller and P. T. Mocanu (Integral Transform. Spec. Funct. 19(2008)) have
considered some sufficient problems for starlikeness. The object of the present
paper is to discuss some sufficient problems for f(z) to be in some classes of
order \alpha.


title: New extensions for a theorem by Mocanu

abstract:
  For analytic functions f(z) in the open unit disk U with
f(0)=f'(0)-1=f"(0)=0, P. T. Mocanu (Mathematica (Cluj), 42(2000)) has
considered some sufficient arguments of f'(z)+zf"(z) for
|\arg(zf'(z)/f(z))|<\pi\mu/2. The object of the present paper is to discuss
those probrems for f(z) with f"(0)=f"'(0)=...=f^{(n)}(0)=0 and f^{(n+1)}(0) \ne
0.


title: An application of Jack's lemma for the minimum point

abstract:
  For the analytic function f(z), H. Shiraishi and S. Owa (Stud. Univ.
Babes-Bolyai Math. 55(2010), 207-211) have shown a theorem for the minimum
value of |f(z)|. In this paper, we discuss an application of this theorem and
some corollaries.


title: 3He-rich SEP Events Observed by STEREO-A

abstract:
  Using the SIT (Suprathermal Ion Telescope) instrument on STEREO-A we have
examined the abundance of the rare isotope 3He during the rising activity phase
of solar cycle 24 between January 2010 and December 2011. We have identified
six solar energetic particle (SEP) events with enormous abundance enhancements
of 3He (3He/4He >1). The events were short lasting, typically ~0.5-1 day and
most of them occurred in association with high-speed solar wind streams and
corotating interaction regions. With one exception the events were not
associated with ~100 keV solar electron intensity increases. The events showed
also enhanced NeS/O and Fe/O ratios. The solar images indicate that the events
were generally associated with the active regions located near a coronal hole.


title:
Critical correlations in an ultracold Bose gas revealed by means of a
  temporal Talbot-Lau interferometer

abstract:
  We study experimentally the critical correlation in an ultra-cold Bose gas
with a temporal Talbot-Lau (TL) interferometer. Near the critical temperature,
we observe a bi-modal density distribution in an ultra-cold Bose gas after the
application of the TL interferometer. The measured fraction of the narrower
peak in the density distribution displays a clear peak within the critical
regime. The peak position agrees with the critical temperature calculated with
the finite-size and interaction corrections. The critical exponents are
extracted from the peak and they agree with the critical exponents for the
correlation length.


title:
Lattice QCD study of the s-wave $\pi\pi $ scattering lengths in the I=0
  and 2 channels

abstract:
  The s-wave pion-pion ($\pi\pi$) scattering lengths are computed below the
inelastic threshold by the L\"uscher technique with pion masses ranging from
240 MeV to 463 MeV. In the Asqtad-improved staggered fermion formulation, we
calculate the $\pi\pi$ four-point functions for the I=0 and 2 channels with
"moving" wall sources without gauge fixing, and analyze them at the
next-to-leading order in the continuum three-flavor chiral perturbation theory.
At the physical pion mass, we secure the s-wave $\pi\pi$ scattering lengths as
$m_\pi a_{\pi\pi}^{I=0} = 0.214(4)(7)$ and $m_\pi a_{\pi\pi}^{I=2} =
-0.04430(25)(40)$ for the I=0 and 2 channels, respectively, where the first
uncertainties are statistical and second ones are our estimates of several
systematic effects. Our lattice results for the s-wave $\pi\pi$ scattering
lengths are in well accordance with available experimental reports and
theoretical forecasts at low momentum. A basic ingredient in our study for the
I=0 case is properly incorporating disconnected diagram. These lattice
computations are carried out with the MILC 2+1 flavor gauge configurations at
two lattice spacings $a \approx 0.15$ and 0.12 fm.


title:
On asymptotically optimal confidence regions and tests for
  high-dimensional models

abstract:
  We propose a general method for constructing confidence intervals and
statistical tests for single or low-dimensional components of a large parameter
vector in a high-dimensional model. It can be easily adjusted for multiplicity
taking dependence among tests into account. For linear models, our method is
essentially the same as in Zhang and Zhang [J. R. Stat. Soc. Ser. B Stat.
Methodol. 76 (2014) 217-242]: we analyze its asymptotic properties and
establish its asymptotic optimality in terms of semiparametric efficiency. Our
method naturally extends to generalized linear models with convex loss
functions. We develop the corresponding theory which includes a careful
analysis for Gaussian, sub-Gaussian and bounded correlated designs.


title: Rotating black hole hair

abstract:
  A Kerr black hole sporting cosmic string hair is studied in the context of
the abelian Higgs model vortex. It is shown that a such a system displays much
richer phenomenology than its static Schwarzschild or Reissner--Nordstrom
cousins, for example, the rotation generates a near horizon electric field. In
the case of an extremal rotating black hole, two phases of the Higgs hair are
possible: Large black holes exhibit standard hair, with the vortex piercing the
event horizon. Small black holes on the other hand, exhibit a flux-expelled
solution, with the gauge and scalar field remaining identically in their false
vacuum state on the event horizon. This solution however is extremely sensitive
to confirm numerically, and we conjecture that it is unstable due to a
supperradiant mechanism similar to the Kerr-adS instability. Finally, we
compute the gravitational back reaction of the vortex, which turns out to be
far more nuanced than a simple conical deficit. While the string produces a
conical effect, it is conical with respect to a local co-rotating frame, not
with respect to the static frame at infinity. As a consequence, we find that
the ergosphere is shifted, and geodesics around the black hole are perturbed.


title:
Comparison of the Information Technology Development in Slovakia and
  Hungary

abstract:
  Nowadays the role of information is increasingly important, so every company
has to provide the efficient procurement, processing, storage and visualization
of this special resource in hope to stay competitive. More and more enterprises
introduce Enterprise Resource Planning System to be able to perform the listed
functions. The article illustrates the usage of these systems in Hungary and
Slovakia, as well as tests the following presumption: the level of Information
Technology (IT) development is lower in Hungary than our northern neighbor.


title:
Non-conventional Anderson localization in a matched quarter stack with
  metamaterials

abstract:
  We study the problem of non-conventional Anderson localization emerging in
bilayer periodic-on-average structures with alternating layers of materials
with positive and negative refraction indices $n_a$ and $n_b$. Main attention
is paid to the model of the so-called quarter stack with perfectly matched
layers (the same unperturbed by disorder impedances, $Z_a=Z_b$, and optical
path lengths, $n_ad_a=|n_b| d_b$, with $d_a$, $d_b$ being the thicknesses of
basic layers). As was recently numerically discovered, in such structures with
weak fluctuations of refractive indices (compositional disorder) the
localization length $L_{loc}$ is enormously large in comparison with the
conventional localization occurring in the structures with positive refraction
indices only. In this paper we develop a new approach which allows us to derive
the expression for $L_{loc}$ for weak disorder and any wave frequency $\omega$.
In the limit $\omega \rightarrow 0$ one gets a quite specific dependence,
$L^{-1}_{loc}\propto\sigma^4\omega^8$ which is obtained within the fourth order
of perturbation theory. We also analyze the interplay between two types of
disorder, when in addition to the fluctuations of $n_a$, $n_b$ the thicknesses
$d_a$, $d_b$ slightly fluctuate as well (positional disorder). We show how the
conventional localization recovers with an addition of positional disorder.


title:
Asymptotic behaviour of ruin probabilities in a general discrete risk
  model using moment indices

abstract:
  We study the rough asymptotic behaviour of a general economic risk model in a
discrete setting. Both financial and insurance risks are taken into account.
Loss during the first $n$ years is modelled as a random variable
$B_1+A_1B_2+\ldots+A_1\ldots A_{n-1}B_n$, where $A_i$ corresponds to the
financial risk of the year $i$ and $B_i$ represents the insurance risk
respectively. Risks of the same year $i$ are not assumed to be independent.
  The main result shows that ruin probabilities exhibit power law decay under
general assumptions. Our objective is to give a complete characterisation of
the relevant quantities that describe the speed at which the ruin probability
vanishes as the amount of initial capital grows. These quantities can be
expressed as maximal moments, called moment indices, of suitable random
variables. In addition to the study of ultimate ruin, the case of finite time
interval ruin is considered. Both of these investigations make extensive use of
the new properties of moment indices developed during the first half of the
paper.


title: Advantage in the discrete Voronoi game

abstract:
  We study the discrete Voronoi game, where two players alternately claim
vertices of a graph for t rounds. In the end, the remaining vertices are
divided such that each player receives the vertices that are closer to his or
her claimed vertices. We prove that there are graphs for which the second
player gets almost all vertices in this game, but this is not possible for
bounded-degree graphs. For trees, the first player can get at least one quarter
of the vertices, and we give examples where she can get only little more than
one third of them. We make some general observations, relating the result with
many rounds to the result for the one-round game on the same graph.


title: Version of A Generalization of Injective and Projective Complexes

abstract:
  Let $\mathcal{X}$ be a class of $R$-modules. In this paper, we investigate
\;$\mathcal{X}$-(f.g.)injective ((f.g.)projective) and
DG-$\mathcal{X}$-injective (projective) complexes which are generalizations of
injective (projective) and DG-injective (projective) complexes. We prove that
some known results can be extended to the class of
\;$\mathcal{X}$-(f.g.)injective ((f.g.)projective) and
DG-$\mathcal{X}$-injective (projective) complexes for this general settings.


title: Quantitative Characterization of Randomly Roving Agents

abstract:
  Quantitative characterization of randomly roving agents in Agent Based
Intrusion Detection Environment (ABIDE) is studied. Formula simplifications
regarding known results and publications are given. Extended Agent Based
Intrusion Detection Environment (EABIDE) is introduced and quantitative
characterization of roving agents in EABIDE is studies.


title:
Search for third generation scalar leptoquarks in pp collisions at
  sqrt(s) = 7 TeV with the ATLAS detector

abstract:
  A search for pair-produced third generation scalar leptoquarks is presented,
using proton-proton collisions at sqrt(s)= 7 TeV at the LHC. The data were
recorded with the ATLAS detector and correspond to an integrated luminosity of
4.7 fb-1. Each leptoquark is assumed to decay to a tau lepton and a b-quark
with a branching fraction equal to 100%. No statistically significant excess
above the Standard Model expectation is observed. Third generation leptoquarks
are therefore excluded at 95% confidence level for masses less than 534 GeV.


title: Focal Plane Wavefront Sensing using Residual Adaptive Optics Speckles

abstract:
  Optical imperfections, misalignments, aberrations, and even dust can
significantly limit sensitivity in high-contrast imaging systems such as
coronagraphs. An upstream deformable mirror (DM) in the pupil can be used to
correct or compensate for these flaws, either to enhance Strehl ratio or
suppress residual coronagraphic halo. Measurement of the phase and amplitude of
the starlight halo at the science camera is essential for determining the DM
shape that compensates for any non-common-path (NCP) wavefront errors. Using DM
displacement ripples to create a series of probe and anti-halo speckles in the
focal plane has been proposed for space-based coronagraphs and successfully
demonstrated in the lab. We present the theory and first on-sky demonstration
of a technique to measure the complex halo using the rapidly-changing residual
atmospheric speckles at the 6.5m MMT telescope using the Clio mid-IR camera.
The AO system's wavefront sensor (WFS) measurements are used to estimate the
residual wavefront, allowing us to approximately compute the rapidly-evolving
phase and amplitude of speckle halo. When combined with relatively-short,
synchronized science camera images, the complex speckle estimates can be used
to interferometrically analyze the images, leading to an estimate of the static
diffraction halo with NCP effects included. In an operational system, this
information could be collected continuously and used to iteratively correct
quasi-static NCP errors or suppress imperfect coronagraphic halos.


title:
Odd and even Maass cusp forms for Hecke triangle groups, and the
  billiard flow

abstract:
  By a transfer operator approach to Maass cusp forms and the Selberg zeta
function for cofinite Hecke triangle groups, M. M\"oller and the author found a
factorization of the Selberg zeta function into a product of Fredholm
determinants of transfer-operator-like families: $Z(s) = \det(1-\mc
L_s^+)\det(1-\mc L_s^-)$. In this article we show that the operator families
$\mc L_s^\pm$ arise as families of transfer operators for the triangle groups
underlying the Hecke triangle groups, and that for $s\in\C$, $\Rea s=\tfrac12$,
the operator $\mc L_s^+$ (resp. $\mc L_s^-$) has a 1-eigenfunction if and only
if there exists an even (resp. odd) Maass cusp form with eigenvalue $s(1-s)$.
For nonarithmetic Hecke triangle groups, this result provides a new formulation
of the Phillips-Sarnak conjecture on nonexistence of even Maass cusp forms.


title:
Average Rate of Downlink Heterogeneous Cellular Networks over
  Generalized Fading Channels - A Stochastic Geometry Approach

abstract:
  In this paper, we introduce an analytical framework to compute the average
rate of downlink heterogeneous cellular networks. The framework leverages
recent application of stochastic geometry to other-cell interference modeling
and analysis. The heterogeneous cellular network is modeled as the
superposition of many tiers of Base Stations (BSs) having different transmit
power, density, path-loss exponent, fading parameters and distribution, and
unequal biasing for flexible tier association. A long-term averaged maximum
biased-received-power tier association is considered. The positions of the BSs
in each tier are modeled as points of an independent Poisson Point Process
(PPP). Under these assumptions, we introduce a new analytical methodology to
evaluate the average rate, which avoids the computation of the Coverage
Probability (Pcov) and needs only the Moment Generating Function (MGF) of the
aggregate interference at the probe mobile terminal. The distinguishable
characteristic of our analytical methodology consists in providing a tractable
and numerically efficient framework that is applicable to general fading
distributions, including composite fading channels with small- and mid-scale
fluctuations. In addition, our method can efficiently handle correlated
Log-Normal shadowing with little increase of the computational complexity. The
proposed MGF-based approach needs the computation of either a single or a
two-fold numerical integral, thus reducing the complexity of Pcov-based
frameworks, which require, for general fading distributions, the computation of
a four-fold integral.


title:
AMS-02 positron excess: new bounds on dark matter models and hint for
  primary electron spectrum hardening

abstract:
  The data collected by ATIC, CREAM and PAMELA all display remarkable
cosmic-ray-nuclei spectrum hardening above the magnetic rigidity $\sim$ 240 GV.
One natural speculation is that the primary electron spectrum also gets
hardened (possibly at $\sim 80$ GV) and the hardening partly accounts for the
electron/positron total spectrum excess discovered by ATIC, HESS and Fermi-LAT.
If it is the case, the increasing behavior of the subsequent
positron-to-electron ratio will get flattened and the spectrum hardening should
be taken into account in the joint fit of the electron/psoitron data otherwise
the inferred parameters will be biased. Our joint fits to the latest AMS-02
positron fraction data together with the PAMELA/Fermi-LAT electron/positron
spectrum data suggest that the primary electron spectrum hardening is needed in
most though not all modelings. The bounds on dark matter models have also been
investigated. In the presence of spectrum hardening of primary electrons, the
amount of dark-matter-originated electron/positron pairs needed in the modeling
is smaller. Even with such a modification, the annihilation channel $\chi\chi
\rightarrow \mu^{+}\mu^{-}$ has been tightly constrained by the Fermi-LAT
Galactic diffuse emission data. The decay channel $\chi\rightarrow
\mu^{+}\mu^{-}$ is found to be viable.


title:
On the modification of the cosmic microwave background anisotropy
  spectrum from canonical quantum gravity

abstract:
  We evaluate the modifications to the cosmic microwave background anisotropy
spectrum that result from a semiclassical expansion of the Wheeler-DeWitt
equation. Recently, such an investigation in the case of a real scalar field
coupled to gravity, has led to the prediction that the power at large scales is
suppressed. We make here a more general analysis and show that there is an
ambiguity in the choice of solution to the equations describing the quantum
gravitational effects. Whereas one of the two solutions describes a suppression
of power, the other one describes an enhancement. We investigate possible
criteria for an appropriate choice of solution. The absolute value of the
correction term is in both cases of the same order and currently not
observable. We also obtain detailed formulae for arbitrary values of a complex
parameter occurring in the general solution of the nonlinear equations of the
model. We finally discuss the modification of the spectral index connected with
the power spectrum and comment on the possibility of a quantum-gravity induced
unitarity violation.


title:
A new phase of scalar field with a kinetic term non-minimally coupled to
  gravity

abstract:
  We consider the dynamics of a scalar field non-minimally coupled to gravity
in the context of cosmology. It is demonstrated that there exists a new phase
for the scalar field, in addition to the inflationary and dust-like (reheating
period) phases. Analytic expressions for the scalar field and the Hubble
parameter, which describe the new phase are given. The Hubble parameter
indicates an accelerating expanding Universe. We explicitly show that the
scalar field oscillates with time- dependent frequency. Moreover, an
interaction between the scalar field in the new phase and other fields is
discussed. It turns out that the parametric resonance is absent, which is
another crucial difference between the dynamics of the scalar field in the new
phase and dust-like phase.


title: Multiband tunneling in trilayer graphene

abstract:
  The electronic tunneling properties of the two stable forms of trilayer
graphene (TLG), rhombohedral ABC and Bernal ABA, are examined for pn and pnp
junctions as realized by using a single gate (SG) or a double gate (DG). For
the rhombohedral form, due to the chirality of the electrons, the Klein paradox
is found at normal incidence for SG devices while at high energy interband
scattering between additional propagation modes can occur. The electrons in
Bernal ABA TLG can have a monolayer- or bilayer-like character when incident on
a SG device. Using a DG however both propagation modes will couple by breaking
the mirror symmetry of the system which induces intermode scattering and
resonances that depend on the width of the DG pnp junction. For ABC TLG the DG
opens up a band gap which suppresses Klein tunneling. The DG induces also an
unexpected asymmetry in the tunneling angle for single valley electrons.


title:
The inviscid instability in an electrically conducting fluid affected by
  a parallel magnetic field

abstract:
  We investigate inviscid instability in an electrically conducting fluid
affected by a parallel magnetic field. The case of low magnetic
  Reynolds number in Poiseuille flow is considered. When the magnetic field is
sufficiently strong, for a flow with low hydrodynamic Reynolds number, it is
already known that the neutral disturbances are three-dimensional. Our
investigation shows that at high hydrodynamic Reynolds number(inviscid flow),
the effect of the strength of the magnetic field on the fastest growing
perturbations is limited to a decrease of their oblique angle i.e. angle
between the direction of the wave propagation and the basic flow. The waveform
remains unchanged. The detailed analysis of the linear instability provided by
the eigenvalue problem shows that the magnetic field has a stabilizing effect
on the electrically conducting fluid flow. We find also that at least, the
unstability appears if the main flow possesses an inflexion point with a
suitable condition between the velocity of the basic flow and the complex
stability parameter according to Rayleigh's inflexion point theorem.


title:
Stability analysis of Boundary Layer in Poiseuille Flow Through A
  Modified Orr-Sommerfeld Equation

abstract:
  For applications regarding transition prediction, wing design and control of
boundary layers, the fundamental understanding of disturbance growth in the
flat-plate boundary layer is an important issue. In the present work we
investigate the stability of boundary layer in Poiseuille flow. We normalize
pressure and time by inertial and viscous effects. The disturbances are taken
to be periodic in the spanwise direction and time. We present a set of linear
governing equations for the parabolic evolution of wavelike disturbances. Then,
we derive modified Orr-Sommerfeld equations that can be applied in the layer.
Contrary to what one might think, we find that Squire's theorem is not
applicable for the boundary layer. We find also that normalization by inertial
or viscous effects leads to the same order of stability or instability. For the
2D disturbances flow ($\theta=0$), we found the same critical Reynolds number
for our two normalizations. This value coincides with the one we know for
neutral stability of the known Orr-Sommerfeld equation. We noticed also that
for all overs values of $k$ in the case $\theta=0$ correspond the same values
of $Re_\delta$ at $c_i=0$ whatever the normalization. We therefore conclude
that in the boundary layer with a 2D-disturbance, we have the same neutral
stability curve whatever the normalization. We find also that for a flow with
hight hydrodynamic Reynolds number, the neu- tral disturbances in the boundary
layer are two-dimensional. At last, we find that transition from stability to
instability or the opposite can occur according to the Reynolds number and the
wave number.


title:
Active Control of the Parametric Resonance in the Modified
  Rayleigh-Duffing Oscillator

abstract:
  The present paper examines the active control of parametric resonance in
modified Rayleigh-Duffing oscillator. We used the method of averaging to obtain
steady-state solutions. We have found the critical value of the parametrical
amplitude which indicates the boundary layer where the control is efficient in
reducing the amplitude vibration. We have also found the effects of excitation
parameters and time-delay on dynamical of this system with the principal
parametric resonance. We have obtained for this oscillator the Hopf bifurcation
and saddle-node bifurcation for certains values of parametric parameters and
time-delay. We have studied the influence of parameter $k_2$ which is one of
the parameters which modify the ordinary Rayleigh-Duffing oscillator. We have
discussed the appropriate choice of the time-delay and control gain. We finally
studied the stability of fixed point and it is found that the appropriate
choice of the time-delay can broaden the stable region of the non-trivial
steady-state solutions which will enhance the control efficiency. Numerical
simulations are performed in order to confirm analytical results.


title:
Recherche et \'etude de la stabilit\'e du cycle limite pour
  l'oscillateur de Rayleigh

abstract:
  In this paper, we studied Rayleigh autonomous oscillator by searching its
limit cycle and by studying the stability of the cycle. Through this study, we
studied the fixed points of the equation of Rayleigh oscillator and we realized
that in reality this oscillator has only one fixed point. What appears new
according to our point of view is that we found the cycle limit of the
oscillator using a form of Poincar\'e-Bendixson theorem. Then, we studied the
stability of this limit cycle by the method of multiple scales. Finally, the
most important is that in this paper we have shown analytically and confirmed
by numerical simulation using Mathematica that the Rayleigh oscillator exhibits
a bifurcation of PAH


title: An Interacting Galaxy System Along a Filament in a Void

abstract:
  Cosmological voids provide a unique environment for the study of galaxy
formation and evolution. The galaxy population in their interior have
significantly different properties than average field galaxies. As part of our
Void Galaxy Survey (VGS), we have found a system of three interacting galaxies
(VGS_31) inside a large void. VGS_31 is a small elongated group whose members
are embedded in a common HI envelope. The HI picture suggests a filamentary
structure with accretion of intergalactic cold gas from the filament onto the
galaxies. We present deep optical and narrow band H_alpha data, optical
spectroscopy, near-UV and far-UV GALEX and CO(1-0) data. We find that one of
the galaxies, a Markarian object, has a ring-like structure and a tail evident
both in optical and HI. While all three galaxies form stars in their central
parts, the tail and the ring of the Markarian object are devoid of star
formation. We discuss these findings in terms of a gravitational interaction
and ongoing growth of galaxies out of a filament. VGS_31 is one of the first
observed examples of a filamentary structure in a void. It is an important
prototype for understanding the formation of substructure in a void. This
system also shows that the galaxy evolution in voids can be as dynamic as in
high density environments.


title:
Novel Method for Mutational Disease Prediction using Bioinformatics
  Techniques and Backpropagation Algorithm

abstract:
  Cancer is one of the most feared diseases in the world it has increased
disturbingly and breast cancer occurs in one out of eight women, the prediction
of malignancies plays essential roles not only in revealing human genome, but
also in discovering effective prevention and treatment of cancers. Generally
cancer disease driven by somatic mutations in an individual DNA sequence, or
genome that accumulates during the lifetime of person. This paper is proposed a
novel method can predict the disease by mutations despite The presence in gene
sequence is not necessary it are malignant, so will be compare the protein of
patient with the gene's protein of disease if there is difference between these
two proteins then can say there is malignant mutations. This method will use
bioinformatics techniques like FASTA, CLUSTALW, etc which shows whether
malignant mutations or not, then training the backpropagation algorithm using
all expected malignant mutations for a certain genes (e.g. BRCA1 and BRCA2) of
disease, and using it to test whether patient is holder the disease or not.
Implementing this novel method as the first way to predict the disease based on
mutations in the sequence of the gene that causes the disease shows two
decisions are achieved successfully, the first diagnose whether the patient has
mutations of cancer or not using bioinformatics techniques the second
classifying these mutations are related to breast cancer (e.g. BRCA1 and BRCA2)
using backpropagation with mean square rate 0.0000001. Keywords-Gene sequence;
Protein; Deoxyribonucleic Acid DNA; Malignant mutation; Bioinformatics;
Back-propagation algorithm.


title: The Space of Solutions of Coupled XORSAT Formulae

abstract:
  The XOR-satisfiability (XORSAT) problem deals with a system of $n$ Boolean
variables and $m$ clauses. Each clause is a linear Boolean equation (XOR) of a
subset of the variables. A $K$-clause is a clause involving $K$ distinct
variables. In the random $K$-XORSAT problem a formula is created by choosing
$m$ $K$-clauses uniformly at random from the set of all possible clauses on $n$
variables. The set of solutions of a random formula exhibits various
geometrical transitions as the ratio $\frac{m}{n}$ varies.
  We consider a {\em coupled} $K$-XORSAT ensemble, consisting of a chain of
random XORSAT models that are spatially coupled across a finite window along
the chain direction. We observe that the threshold saturation phenomenon takes
place for this ensemble and we characterize various properties of the space of
solutions of such coupled formulae.


title: Derived categories of surfaces isogenous to a higher product

abstract:
  We construct exceptional sequences of line bundles of maximal length on a
family of surfaces isogenous to a higher product of unmixed type with
$p_g=q=0$.


title:
A multidimensional tropical optimization problem with nonlinear
  objective function and linear constraints

abstract:
  We examine a multidimensional optimisation problem in the tropical
mathematics setting. The problem involves the minimisation of a nonlinear
function defined on a finite-dimensional semimodule over an idempotent
semifield subject to linear inequality constraints. We start with an overview
of known tropical optimisation problems with linear and nonlinear objective
functions. A short introduction to tropical algebra is provided to offer a
formal framework for solving the problem under study. As a preliminary result,
a solution to a linear inequality with an arbitrary matrix is presented. We
describe an example optimisation problem drawn from project scheduling and then
offer a general representation of the problem. To solve the problem, we
introduce an additional variable and reduce the problem to the solving of a
linear inequality, in which the variable plays the role of a parameter. A
necessary and sufficient condition for the inequality to hold is used to
evaluate the parameter, whereas the solution to the inequality is considered a
solution to the problem. Based on this approach, a complete direct solution in
a compact vector form is derived for the optimisation problem under fairly
general conditions. Numerical and graphical examples for two-dimensional
problems are given to illustrate the obtained results.


title: Gluon polarization and jet production at STAR

abstract:
  At RHIC kinematics, polarized jet hadroproduction is dominated by $gg$ and
$qg$ scattering, making the jet longitudinal double-spin asymmetry, $A_{LL}$,
sensitive to gluon polarization in the nucleon. I will present STAR results of
$A_{LL}$ from inclusive jet and dijet measurements for the RHIC 2006 run
totaling 5.5 pb$^{-1}$ of integrated luminosity with 55% beam polarization at
center-of-mass energy 200 GeV. I will also present preliminary results from the
analyses of data from the 2009 run, which collected a much larger sample (25
pb$^{-1}$ with 57% polarization) at 200 GeV. The results are compared with
theoretical calculations of $A_{LL}$ based on various models of the polarized
gluon distribution function in the nucleon. The STAR data place significant
constraints on allowed theoretical models.


title:
Invariance of waveguide grating mirrors to lateral displacement phase
  shifts

abstract:
  We present a method to analyse the coupling of lateral displacements in
nanoscale structures, in particular waveguide grating mirrors (WGM), into the
phase of a reflected Gaussian beam using a finite-difference time-domain
simulation. Such phase noise is of interest for using WGMs in high-precision
interferometry. We show that WGMs do not couple lateral displacements into the
phase of a reflected beam to a precision of 10^{-7} rad and that WGMs are
therefore not subject to the same stringent alignment requirements as
previously proposed layouts using diffraction gratings.


title: Complex multiplication cycles and Kudla-Rapoport divisors

abstract:
  We study the intersections of special cycles on a unitary Shimura variety of
signature (n-1,1), and show that the intersection multiplicities of these
cycles agree with Fourier coefficients of Eisenstein series. The results are
new cases of conjectures of Kudla, and suggest a Gross-Zagier theorem for
unitary Shimura varieties.


title: Littlewood complexes and analogues of determinantal varieties

abstract:
  One interesting combinatorial feature of classical determinantal varieties is
that the character of their coordinate rings give a natural truncation of the
Cauchy identity in the theory of symmetric functions. Natural generalizations
of these varieties exist and have been studied for the other classical groups.
In this paper we develop the relevant properties from scratch. By studying the
isotypic decomposition of their minimal free resolutions one can recover
classical identities due to Littlewood for expressing an irreducible character
of a classical group in terms of Schur functions. We propose generalizations
for the exceptional groups. In type G_2, we completely analyze the variety and
its minimal free resolution and get an analogue of Littlewood's identities. We
have partial results for the other cases. In particular, these varieties are
always normal with rational singularities.


title: Complex multiplication cycles and Kudla-Rapoport divisors II

abstract:
  This paper is about the arithmetic of Kudla-Rapoport divisors on Shimura
varieties of type GU(n-1,1). In the first part of the paper we construct a
toroidal compactification of N. Kramer's integral model of the Shimura variety.
This extends work of K.-W. Lan, who constructed a compactification at
unramified primes.
  In the second, and main, part of the paper we use ideas of Kudla to construct
Green functions for the Kudla-Rapoport divisors on the open Shimura variety,
and analyze the behavior of these functions near the boundary of the
compactification. The Green functions turn out to have logarithmic
singularities along certain components of the boundary, up to log-log error
terms. Thus, by adding a prescribed linear combination of boundary components
to a Kudla-Rapoport divisor one obtains a class in the arithmetic Chow group of
Burgos-Kramer-Kuhn.
  In the third and final part of the paper we compute the arithmetic
intersection of each of these divisors with a cycle of complex multiplication
points. The computation is quickly reduced to the calculations of the author's
earlier work Complex multiplication cycles and Kudla-Rapoport divisors. The
arithmetic intersection multiplicities are shown to appear as Fourier
coefficients of the diagonal restriction of the central derivative of a Hilbert
modular Eisenstein series.


title: The mixed scalar curvature flow and harmonic foliations

abstract:
  We introduce and study the flow of metrics on a foliated Riemannian manifold
$(M,g)$, whose velocity along the orthogonal distribution is proportional to
the mixed scalar curvature, $\Sc_{\,\rm mix}$. The flow is used to examine the
question: When a foliation admits a metric with a given property of $\Sc_{\,\rm
mix}$ (e.g., positive or negative)\/? We observe that the flow preserves
harmonicity of foliations and yields the Burgers type equation along the leaves
for the mean curvature vector $H$ of orthogonal distribution. If $H$ is
leaf-wise conservative, then its potential obeys the non-linear heat equation
$\dt u=n\Delta_\calf\,u +(n\beta_{\mathcal D}+\Phi)\,u+\Psi^\calf_1
u^{-1}-\Psi^\calf_2 u^{-3}$ with a leaf-wise constant $\Phi$ and known
functions $\beta_{\mathcal D}\ge0$ and $\Psi^\calf_i\ge0$. We study the
asymptotic behavior of its solutions and prove that under certain conditions
(in terms of spectral parameters of leaf-wise Schr\"{o}dinger operator
$\mathcal{H}_\calf=-\Delta_\calf -\beta_{\mathcal D}\id$) there exists a unique
global solution $g_t$, whose $\Sc_{\rm mix}$ converges exponentially as
$t\to\infty$ to a leaf-wise constant. The metrics are smooth on $M$ when all
leaves are compact and have finite holonomy group. Hence, in certain cases,
there exist ${\mathcal D}$-conformal to $g$ metrics, whose $\Sc_{\rm mix}$ is
negative or positive.


title: Heights of Kudla-Rapoport divisors and derivatives of L-functions

abstract:
  We study special cycles on integral models of Shimura varieties associated
with unitary similitude groups of signature (n-1,1). We construct an arithmetic
theta lift from harmonic Maass forms of weight 2-n to the arithmetic Chow group
of the integral model of a unitary Shimura variety, by associating to a
harmonic Maass form f a linear combination of Kudla-Rapoport divisors, equipped
with the Green function given by the regularized theta lift of f.
  Our main result is an equality of two complex numbers: (1) the height pairing
of the arithmetic theta lift of f against a CM cycle, and (2) the central
derivative of the convolution L-function of a weight n cusp form (depending on
f) and the theta function of a positive definite hermitian lattice of rank n-1.
When specialized to the case n=2, this result can be viewed as a variant of the
Gross-Zagier formula for Shimura curves associated to unitary groups of
signature (1,1). The proof relies on, among other things, a new method for
computing improper arithmetic intersections.


title: Tameness from Large Cardinal Axioms

abstract:
  We show that Shelah's Eventual Categoricity Conjecture follows from the
existence of class many strongly compact cardinals. This is the first time the
consistency of this conjecture has been proven. We do so by showing that every
AEC with $LS(K)$ below a strongly compact cardinal $\kappa$ is $< \kappa$ tame
and applying the categoricity transfer of Grossberg and VanDieren. These
techniques also apply to measurable and weakly compact cardinals and we prove
similar tameness results under those hypotheses. We isolate a dual property to
tameness, called \emph{type shortness}, and show that it follows similarly from
large cardinals.


title: Sparse PCA through Low-rank Approximations

abstract:
  We introduce a novel algorithm that computes the $k$-sparse principal
component of a positive semidefinite matrix $A$. Our algorithm is combinatorial
and operates by examining a discrete set of special vectors lying in a
low-dimensional eigen-subspace of $A$. We obtain provable approximation
guarantees that depend on the spectral decay profile of the matrix: the faster
the eigenvalue decay, the better the quality of our approximation. For example,
if the eigenvalues of $A$ follow a power-law decay, we obtain a polynomial-time
approximation algorithm for any desired accuracy.
  A key algorithmic component of our scheme is a combinatorial feature
elimination step that is provably safe and in practice significantly reduces
the running complexity of our algorithm. We implement our algorithm and test it
on multiple artificial and real data sets. Due to the feature elimination step,
it is possible to perform sparse PCA on data sets consisting of millions of
entries in a few minutes. Our experimental evaluation shows that our scheme is
nearly optimal while finding very sparse vectors. We compare to the prior state
of the art and show that our scheme matches or outperforms previous algorithms
in all tested data sets.


title:
Time-dependent Hartree-Fock calculations for multinucleon transfer
  processes in $^{40,48}$Ca+$^{124}$Sn, $^{40}$Ca+$^{208}$Pb, and
  $^{58}$Ni+$^{208}$Pb reactions

abstract:
  Multinucleon transfer processes in heavy-ion reactions at energies slightly
above the Coulomb barrier are investigated in a fully microscopic framework of
the time-dependent Hartree-Fock (TDHF) theory. Transfer probabilities are
calculated from the TDHF wave function after collision using the projection
operator method which has recently been proposed by Simenel (C. Simenel, Phys.
Rev. Lett. 105, 192701 (2010)). We show results of the TDHF calculations for
transfer cross sections of the reactions of $^{40,48}$Ca+$^{124}$Sn at
$E_{lab}=$ 170, 174 MeV, $^{40}$Ca+$^{208}$Pb at $E_{lab}=$ 235, 249 MeV, and
$^{58}$Ni+$^{208}$Pb at $E_{lab}=$ 328.4 MeV, for which measurements are
available. We find the transfer processes show different behaviors depending on
the $N/Z$ ratios of the projectile and the target, and the product of the
charge numbers, $Z_P Z_T$. When the projectile and the target have different
$N/Z$ ratios, fast transfer processes of a few nucleons towards the charge
equilibrium of the initial system occur in reactions at large impact
parameters. As the impact parameter decreases, a neck formation is responsible
for the transfer. A number of nucleons are transferred by the neck breaking
when two nuclei dissociate, leading to transfers of protons and neutrons in the
same direction. Comparing cross sections by theory and measurements, we find
the TDHF theory describes the transfer cross sections of a few nucleons
reasonably. As the number of transferred nucleons increases, the agreement
becomes less accurate. The TDHF calculation overestimates transfer cross
sections accompanying a large number of neutrons when more than one proton are
transferred. Comparing our results with those by other theories, we find the
TDHF calculations give qualitatively similar results to those of direct
reaction models such as GRAZING and Complex WKB.


title:
Searches for New Physics in the Standard Model's Electroweak Sector:
  Quartic Anomalous Couplings with Vector Boson Fusion and Flavor Changed
  Neutral Current in the $SU(3)_{C}\otimes SU(3)_{L}\otimes U(1)_{X}$ model

abstract:
  In this thesis we investigated, at partonic level and leading order, the LHC
potencial operating with $\sqrt{s}=14$ TeV and integrated luminosity of
$L=100\;{fb}^{-1}$ to probe "pure" (without triple vertex contributions)
anomalous electroweak quartic couplings, $WWWW$ and $WWZZ$, in the semileptonic
$pp \rightarrow l^{\pm}\nu_{l}jjjj$ channel, enhanced by the Vector Boson
Fusion collider signatures. Deviations on SM quartic couplings were
parameterized in a model independent approach, realized linearly ($L_{S0}$ and
$L_{S1}$ operators) or not ($L_{4}$ and $L_{5}$ operators), on the basis of
effective lagrangians. Being our analysis essentially events counting-and-cut
based, we took into account all possible backgrounds (irreducible, QCD and top
quarks processes) considered at ${\cal O}(\alpha_{em}^{6})$, ${\cal
O(\alpha_{em}^{4}\alpha_{s}^{2})$ and ${\cal
O}(\alpha_{em}^{2}\alpha_{s}^{4})$. In this way, we have obtained the following
constraints for the non-linear $\alpha_{4}$ and $\alpha_{5}$ anomalous
couplings: $|\alpha_{4,5}| \lesssim 0.01$ to 0.02 at 3$\sigma$. Based on
non-linear results, we have estimated, for a specific choice of factorization
and renormalization scale, the linear parameters $f_{0}$ and $f_{1}$
constraints as $-22 \leq \dfrac{f_{0}}{\Lambda^{4}}\;({TeV}^{-4}) \leq 20,
\quad {and} \quad -26 \leq \dfrac{f_{1}}{\Lambda^{4}}\;({TeV}^{-4}) \leq 24$ at
3$\sigma$. On a different approach, manipulating one extension of the SM named
$331_{RHN}$, we have evaluated the contribution of new sources of FCNC for the
difference of mass of neutral meson systems, $K_{0}-\bar{K_{0}}$,
$D^{0}-\bar{D^0}$ and $B^0_d-\bar{B^0_d}$. Bounds related to these systems may
be significantly strengthened in the presence of these new interactions
allowing stronger constraints on the parameter space of the model.


title:
Visible and near-infrared observations of asteroid 2012 DA14 during its
  closest approach of February 15, 2013

abstract:
  Near-Earth asteroid 2012 DA14 made its closest approach on February 15, 2013,
when it passed at a distance of 27,700 km from the Earth's surface. It was the
first time an asteroid of moderate size was predicted to approach that close to
the Earth, becoming bright enough to permit a detailed study from ground-based
telescopes. Asteroid 2012 DA14 was poorly characterized before its closest
approach. We acquired data using several telescopes on four Spanish
observatories: the 10.4m Gran Telescopio Canarias (GTC) and the 3.6m Telescopio
Nazionale Galileo (TNG), both in the El Roque de los Muchachos Observatory
(ORM, La Palma); the 2.2m CAHA telescope, in the Calar Alto Observatory
(Almeria); the f/3 0.77m telescope in the La Hita Observatory (Toledo); and the
f/8 1.5m telescope in the Sierra Nevada Observatory (OSN, Granada). We obtained
visible and near-infrared color photometry, visible spectra and time-series
photometry. Visible spectra together with color photometry of 2012 DA14 show
that it can be classified as an L-type asteroid, a rare spectral type with a
composition similar to that of carbonaceous chondrites. The time-series
photometry provides a rotational period of 8.95 +- 0.08 hours after the closest
approach, and there are indications that the object suffered a spin-up during
this event. The large amplitude of the light curve suggests that the object is
very elongated and irregular, with an equivalent diameter of around 18m. We
obtain an absolute magnitude of H_R = 24.5 +- 0.2, corresponding to H_V = 25.0
+- 0.2. The GTC photometry also gives H_V = 25.29 +- 0.14. Both values agree
with the value listed at the Minor Planet Center shortly after discovery. From
the absolute photometry, together with some constraints on size and shape, we
compute a geometric albedo of p_V = 0.44 +- 0.20, which is slightly above the
range of albedos known for L-type asteroids (0.082 - 0.405).


title: X-ray selected galaxy clusters in the Pan-STARRS Medium-Deep Survey

abstract:
  [abridged]
  We present the results of a pilot study for the extended MACS survey (eMACS),
a comprehensive search for distant, X-ray luminous galaxy clusters at z>0.5.
Our pilot study applies the eMACS concept to the 71 deg^2 area extended by the
ten fields of the Pan-STARRS1 (PS1) Medium Deep Survey (MDS). Candidate
clusters are identified by visual inspection of PS1 images in the g,r, i, and z
bands in a 5x5 arcmin^2 region around X-ray sources detected in the ROSAT
All-Sky Survey (RASS). To test and optimize the eMACS X-ray selection criteria,
our pilot study uses the largest possible RASS database, i.e., all RASS sources
listed in the Bright and Faint Source Catalogs (BSC and FSC) that fall within
the MDS footprint. Scrutiny of PS1/MDS images for 41 BSC and 200 FSC sources
combined with dedicated spectroscopic follow-up observations results in a
sample of 11 clusters with estimated or spectroscopic redshifts of z>0.3. X-ray
follow-up observations will be crucial in order to establish robust cluster
luminosities for eMACS clusters.
  Although the small number of distant X-ray luminous clusters in the MDS does
not allow us to make firm predictions for the over 20,000 deg^2 of
extragalactic sky covered by eMACS, the identification of two extremely
promising eMACS cluster candidates at z>0.6 (both yet to be observed with
Chandra) in such a small solid angle is encouraging. Representing a tremendous
gain over the presently known two dozen such systems from X-ray, optical, and
SZ cluster surveys combined, the sample of over 100 extremely massive clusters
at z>0.5 expected from eMACS would be invaluable for the identification of the
most powerful gravitational lenses in the Universe, as well as for in-depth and
statistical studies of the physical properties of the most massive galaxy
clusters out to z~1.


title:
A Joint Localization and Clock Bias Estimation Technique Using
  Time-of-Arrival at Multiple Antenna Receivers

abstract:
  In this work, a system scheme is proposed for tracking a radio emitting
target moving in two-dimensional space. The localization is based on the use of
biased time-of-arrival (TOA) measurements obtained at two asynchronous
receivers, each equipped with two closely spaced antennas. By exploiting the
multi-antenna configuration and using all the TOA measurements up to current
time step, the relative clock bias at each receiver and the target position are
jointly estimated by solving a nonlinear least-squares (NLS) problem. To this
end, a novel time recursive algorithm is proposed which fully takes advantage
of the problem structure to achieve computational efficiency while using
orthogonal transformations to ensure numerical reliability. Simulations show
that the mean-squared error (MSE) of the proposed method is much smaller than
that of existing methods with the same antenna scheme, and approaches the
Cramer-Rao lower bound (CRLB) closely.


title:
Security Analysis on "An Authentication Code Against Pollution Attacks
  in Network Coding"

abstract:
  We analyze the security of the authentication code against pollution attacks
in network coding given by Oggier and Fathi and show one way to remove one very
strong condition they required. Actually, we find a way to attack their
authentication scheme. In their scheme, they considered that if some malicious
nodes in the network collude to make pollution in the network flow or make
substitution attacks to other nodes, they thought these malicious nodes must
solve a system of linear equations to recover the secret parameters. Then they
concluded that their scheme is an unconditional secure scheme. Actually, note
that the authentication tag in the scheme of Oggier and Fathi is nearly linear
on the messages, so it is very easy for any malicious node to make pollution
attack in the network flow, replacing the vector of any incoming edge by linear
combination of his incoming vectors whose coefficients have sum 1. And if the
coalition of malicious nodes can carry out decoding of the network coding, they
can easily make substitution attack to any other node even if they do not know
any information of the private key of the node. Moreover, even if their scheme
can work fruitfully, the condition in their scheme $H\leqslant M$ in a network
can be removed, where $H$ is the sum of numbers of the incoming edges at
adversaries. Under the condition $H\leqslant M$, $H$ may be large, so we need
large parameter $M$ which increases the cost of computation a lot. On the other
hand, the parameter $M$ can not be very large as it can not exceed the length
of original messages.


title:
Anomalous selective reflection in cholesteryl oleyl carbonate - nematic
  5CB mixtures and effects of their doping by single-walled carbon nanotubes

abstract:
  Liquid crystalline (LC) mixtures of cholesteryl oleyl carbonate (COC) and
4-pentyl-4'-cyanobiphenyl (5CB), as well as dispersions of single-walled carbon
nanotubes (NTs) in these mixtures, were studied by means of selective
reflection measurements, differential scanning calorimetry (DSC) and optical
microscopy. The relative mass of COC in a mixture X was varied between 0.4 and
1.0, the temperature range of measurements was between 284 K and 314 K, and
concentration of NTs was fixed at 0.1 %. Two important anomalies were noted:
(1) the cholesteric to smectic-A transition temperature increased on dilution
of COC by non-smectogenic 5CB in the concentration range 0.8<X<1, and (2) the
reciprocal pitch vs. 5CB concentration dependence was essentially linear, in
contrast to behaviour commonly observed in nematic-cholesteric mixtures. A
model of molecular arrangement in the mixtures, accounting for the possibility
of integration of 5CB dimers and monomers between COC molecules and presumably
explaining the experimental data, was proposed. The helical pitch of the
cholesteric mixtures remained practically unchanged upon doping by NTs, and
only slight widening of the selective reflection peaks was noted. The obtained
results allow considering the COC+5CB mixtures as promising matrices for
composite materials on the basis of liquid crystals and carbon nanotubes.


title: Transport Properties for Triangular Barriers in Graphene

abstract:
  We theoretically study the electronic transport properties of Dirac fermions
through one and double triangular barriers in graphene. Using the transfer
matrix method, we determine the transmission, conductance and Fano factor. They
are obtained to be various parameters dependent such as well width, barrier
height and barrier width. Therefore, different discussions are given and
comparison with the previous significant works is done. In particular, it is
shown that at Dirac point the Dirac fermions always own a minimum conductance
associated with a maximum Fano factor and change their behaviors in an
oscillatory way (irregularly periodical tunneling peaks) when the potential of
applied voltage is increased.

categories: cond-mat.mes-hall math-ph math.MP quant-ph


title:
LC nanocomposites: induced optical singularities, managed nano/micro
  structure, and electrical conductivity

abstract:
  Microstructure, phase transitions, electrical conductivity, and optical and
electrooptical properties of multiwalled carbon nanotubes (NTs), dispersed in
the cholesteric liquid crystal (cholesteryl oleyl carbonate, COC), nematic 5CB
and their mixtures, were studied in the temperature range between 255 K and 363
K. The relative concentration X=COC/(COC+5CB)was varied within 0.0-1.0. The
concentration $C_p$ of NTs was varied within 0.01-5% wt. The value of X
affected agglomeration and stability of NTs inside COC+5CB. High-quality
dispersion, exfoliation, and stabilization of the NTs were observed in COC
solvent ("good" solvent). From the other side, the aggregation of NTs was very
pronounced in nematic 5CB solvent ("bad" solvent). The dispersing quality of
solvent influenced the percolation concentration $C_p$, corresponding to
transition between the low conductive and high conductive states: e.g.,
percolation was observed at $C_p=1%$ and $C_p=0.1%$ for pure COC and 5CB,
respectively. The effects of thermal pre-history on the heating-cooling
hysteretic behavior of electrical conductivity were studied. The mechanism of
dispersion of NTs in COC+5CB mixtures is discussed. Utilization of the mixtures
of "good" and "bad" solvents allowed fine regulation of the dispersion,
stability and electrical conductivity of LC+NTs composites. The mixtures of COC
and 5CB were found to be promising for application as functional media with
controllable useful chiral and electrophysical properties.


title: Top-down particle filtering for Bayesian decision trees

abstract:
  Decision tree learning is a popular approach for classification and
regression in machine learning and statistics, and Bayesian
formulations---which introduce a prior distribution over decision trees, and
formulate learning as posterior inference given data---have been shown to
produce competitive performance. Unlike classic decision tree learning
algorithms like ID3, C4.5 and CART, which work in a top-down manner, existing
Bayesian algorithms produce an approximation to the posterior distribution by
evolving a complete tree (or collection thereof) iteratively via local Monte
Carlo modifications to the structure of the tree, e.g., using Markov chain
Monte Carlo (MCMC). We present a sequential Monte Carlo (SMC) algorithm that
instead works in a top-down manner, mimicking the behavior and speed of classic
algorithms. We demonstrate empirically that our approach delivers accuracy
comparable to the most popular MCMC method, but operates more than an order of
magnitude faster, and thus represents a better computation-accuracy tradeoff.


title:
Effects of partial charge-transfer solute -- solvent interactions in
  absorption spectra of aromatic hydrocarbons in aqueous and alcoholic
  solutions

abstract:
  A method for study of charge-transfer interactions between solute molecules
and solvent based on the comparison of the ratios of spectral shifts of
different electronic transitions in solute molecules in chemically inert
solvent is proposed. The method is applicable to molecules that do not change
their dipole moment on excitation. As an example, a presence of charge transfer
interactions in higher electronic states of aromatic hydrocarbons (benzene,
phenanthrene, and naphthalene) dissolved in water and alcohols was
demonstrated.


title:
Connecting the Sun's High-Resolution Magnetic Carpet to the Turbulent
  Heliosphere

abstract:
  The solar wind is connected to the Sun's atmosphere by flux tubes that are
rooted in an ever-changing pattern of positive and negative magnetic polarities
on the surface. Observations indicate that the magnetic field is filamentary
and intermittent across a wide range of spatial scales. However, we do not know
to what extent the complex flux tube topology seen near the Sun survives as the
wind expands into interplanetary space. In order to study the possible
long-distance connections between the corona and the heliosphere, we developed
new models of turbulence-driven solar wind acceleration along empirically
constrained field lines. We used a potential-field model of the Quiet Sun to
trace field lines into the ecliptic plane with unprecedented spatial resolution
at their footpoints. For each flux tube, a one-dimensional model was created
with an existing wave/turbulence code that solves equations of mass, momentum,
and energy conservation from the photosphere to 4 AU. To take account of
stream-stream interactions between flux tubes, we used those models as inner
boundary conditions for a time-steady MHD description of radial and
longitudinal structure in the ecliptic. Corotating stream interactions smear
out much of the smallest-scale variability, making it difficult to see how
individual flux tubes on granular or supergranular scales can survive out to 1
AU. However, our models help clarify the level of "background" variability with
which waves and turbulent eddies should be expected to interact. Also, the
modeled fluctuations in magnetic field magnitude were seen to match measured
power spectra quite well.