title:
Optimization and analysis of experimental parameters for polarization
  gradient cooling in optical molasses

abstract:
  We systematically investigate the dependence of the temperature of cold
cesium atoms of polarization gradient cooling (PGC) in optical molasses on
experimental parameters, which contain changing modes of cooling laser, PGC
interaction time, cooling laser frequency and its intensity. The SR mode of
cooling laser, that means the cooling laser frequency is changed with step mode
and cooling laser intensity is changed with ramp mode, is found to be the best
for PGC comparing with other SS, RS, and RR modes. We introduce a statistical
explanation and an exponential decay function to explain the variation of cold
atomic temperature on time. The heating effect is observed when the cooling
laser intensity is lower than the saturation intensity of cold atoms. After
optimization, the lowest temperature of cold cesium atoms is observed to be
about 4uK with the number of 2x10^9, a density of 1x10^11/cm^3 and the phase
space density of 4.4x10^(-5). The optimization process and analysis of
controllable experimental parameters are also meaningful for other cold atomic
systems.


title: Detecting regularities on grammar-compressed strings

abstract:
  We solve the problems of detecting and counting various forms of regularities
in a string represented as a Straight Line Program (SLP). Given an SLP of size
$n$ that represents a string $s$ of length $N$, our algorithm compute all runs
and squares in $s$ in $O(n^3h)$ time and $O(n^2)$ space, where $h$ is the
height of the derivation tree of the SLP. We also show an algorithm to compute
all gapped-palindromes in $O(n^3h + gnh\log N)$ time and $O(n^2)$ space, where
$g$ is the length of the gap. The key technique of the above solution also
allows us to compute the periods and covers of the string in $O(n^2 h)$ time
and $O(nh(n+\log^2 N))$ time, respectively.


title: Remarks on diameter 2 properties

abstract:
  If $X$ is an infinite-dimensional uniform algebra, if $X$ has the Daugavet
property or if $X$ is a proper $M$-embedded space, every relatively weakly open
subset of the unit ball of the Banach space $X$ is known to have diameter 2,
i.e., $X$ has the diameter 2 property. We prove that in these three cases even
every finite convex combination of relatively weakly open subsets of the unit
ball have diameter 2. Further, we identify new examples of spaces with the
diameter 2 property outside the formerly known cases; in particular we observe
that forming $\ell_p$-sums of diameter 2 spaces does not ruin diameter 2
structure.


title: Quantum nonlocality of massive qubits in a moving frame

abstract:
  We perform numerical tests on quantum nonlocality of two-level quantum
systems (qubits) observed by a uniformly moving observer. Under a suitable
momentum setting, the quantum nonlocality of two-qubit nonmaximally entangled
states could be weakened drastically by the Lorentz transformation allowing for
the existence of local-hidden-variable models, whereas three-qubit genuinely
entangled states are robust. In particular, the generalized GHZ state remains
nonlocal under arbitrary Wigner rotation and the generalized W state could
admit local-hidden-variable models within a rather narrow range of parameters.


title:
Homogenization of fully nonlinear elliptic equations with oscillating
  dirichlet boundary data

abstract:
  This paper deals with the homogenization of fully nonlinear second order
equation with an oscillating Dirichlet boundary data when the operator and
boundary data are $\e$-periodic. We will show that the solution $u_\e$
converges to some function $\bar u(x)$ uniformly on every compact subset $K$ of
the domain $D$. Moreover, $\bar u$ is a solution to some boundary value
problem. For this result, we assume that the boundary of the domain has no
(rational) flat spots and the ratio of elliptic constants $\Lambda / \lambda$
is sufficiently large.


title:
Harmonic Sums, Polylogarithms, Special Numbers, and their
  Generalizations

abstract:
  In these introductory lectures we discuss classes of presently known nested
sums, associated iterated integrals, and special constants which hierarchically
appear in the evaluation of massless and massive Feynman diagrams at higher
loops. These quantities are elements of stuffle and shuffle algebras implying
algebraic relations being widely independent of the special quantities
considered. They are supplemented by structural relations. The generalizations
are given in terms of generalized harmonic sums, (generalized) cyclotomic sums,
and sums containing in addition binomial and inverse-binomial weights. To all
these quantities iterated integrals and special numbers are associated. We also
discuss the analytic continuation of nested sums of different kind to complex
values of the external summation bound N.

categories: math-ph cs.SC hep-ph hep-th math.AG math.MP


title:
Learning and Spatiotemporally Correlated Functions Mimicked in
  Oxide-Based Artificial Synaptic Transistors

abstract:
  Learning and logic are fundamental brain functions that make the individual
to adapt to the environment, and such functions are established in human brain
by modulating ionic fluxes in synapses. Nanoscale ionic/electronic devices with
inherent synaptic functions are considered to be essential building blocks for
artificial neural networks. Here, Multi-terminal IZO-based artificial synaptic
transistors gated by fast proton-conducting phosphosilicate electrolytes are
fabricated on glass substrates. Proton in the SiO2 electrolyte and IZO channel
conductance are regarded as the neurotransmitter and synaptic weight,
respectively. Spike-timing dependent plasticity, short-term memory and
long-term memory were successfully mimicked in such protonic/electronic hybrid
artificial synapses. And most importantly, spatiotemporally correlated logic
functions are also mimicked in a simple artificial neural network without any
intentional hard-wire connections due to the naturally proton-related coupling
effect. The oxide-based protonic/electronic hybrid artificial synaptic
transistors reported here are potential building blocks for artificial neural
networks.


title:
Enhanced CBF Packet Filtering Method to Detect DDoS Attack in Cloud
  Computing Environment

abstract:
  Tremendous and extraordinary growths in the field of internet, intranet,
extranet and its users have developed an innovative era of great global
competition and contention. Denial of service attack by multiple nodes is
accomplished of disturbing the services of rival servers. The attack can be for
multiple reasons. So it is a major threat for cloud environment. Due to low
effectiveness and large storage conventional defending approaches cannot be
easily applied in cloud security. The effects of various attacks can decrease
the influence of a cloud. So, in view of this challenge task, this paper aims
at enhancing a proposed method for cloud security. We propose a modification to
the confidence Based Filtering method (CBF) which is investigated for cloud
computing environment based on correlation pattern to mitigate DDoS attacks on
Cloud. The modification introduces nominal additional bandwidth and tries to
increase the processing speed of the victim initiated server.


title:
Constrains on treating linear part as perturbation in a QCD Potential
  Model

abstract:
  We make a review of the different works of Quark Model which are based on
Perturbation theory. We make a critical analysis of taking linear part of the
Potential as perturbation with Coulombic part as parent and its reverse case.
We find in the analysis that the linear part can be treated as perturbation for
a set of larger values of $\alpha_{s}$ in the range $0.37 \leq \alpha_{s}\leq
0.75$ with a constant shift in the Cornell potential within range of $-0.4 GeV
\leq c \leq -1 GeV$. Moreover with the same range of constant shift in the
Potential, we expect better results with coulombic part as perturbation for
$\alpha_{s}\leq 0.37$.


title: Lower bounds on the M\"{u}nchhausen problem

abstract:
  "The Baron's omni-sequence", B(n), first defined by Khovanova and Lewis
(2011), is a sequence that gives for each n the minimum number of weighings on
balance scales that can verify the correct labeling of n identically-looking
coins with distinct integer weights between 1 gram and n grams. A trivial lower
bound on B(n) is log_3(n), and it has been shown that B(n) is log_3(n) + O(log
log n). In this paper we give a first nontrivial lower bound to the
M\"{u}nchhausen problem, showing that there is an infinite number of n values
for which B(n) does not equal ceil(log_3 n). Furthermore, we show that if N(k)
is the number of n values for which k = ceil(log_3 n) and B(n) does not equal
k, then N(k) is an unbounded function of k.


title:
Spectral imaging of the Central Molecular Zone in multiple 7-mm
  molecular lines

abstract:
  We have imaged 24 spectral lines in the Central Molecular Zone (CMZ) around
the Galactic Centre, in the range 42 to 50 GHz. The lines include emission from
the CS, CH3OH, HC3N, SiO, HNCO, HOCO+, NH2CHO, OCS, HCS+, CCS, C34S, 13CS,
29SiO, H13CCCN, HCC13CN and HC5}N molecules, and three hydrogen recombination
lines. The area covered is Galactic longitude -0.7 to 1.8 deg. and latitude
-0.3 to 0.2 deg., including the bright cores around Sgr A, SgrB2, SgrC and
G1.6-0.025. This work used the 22-m Mopra radio telescope in Australia,
obtaining ~ 1.8 km/s spectral and ~ 65 arcsec spatial resolution. We present
peak images from this study and conduct a principal component analysis on the
integrated emission from the brightest 10 lines, to study similarities and
differences in the line distribution. We examine the integrated line
intensities and line ratios in selected apertures around the bright cores, as
well as for the complete mapped region of the CMZ. We compare these 7-mm lines
to the corresponding lines in the 3-mm band, for five molecules, to study the
excitation. There is a variation in 3-mm to 7-mm line ratio across the CMZ,
with relatively higher ratio in the centre around Sgr B2 and Sgr A. We find
that the lines are sub-thermally excited, and from modelling with RADEX find
that non-LTE conditions apply, with densities of order 10^4 cm^{-3}.


title:
Dynamics of colloidal aggregation in microgravity by critical Casimir
  forces

abstract:
  Using the critical Casimir force, we study the attractive-strength dependence
of diffusion-limited colloidal aggregation in microgravity. By means of near
field scattering we measure both the static and dynamic structure factor of the
aggregates as the aggregation process evolves. The simultaneous measurement of
both the static and dynamic structure factor under ideal microgravity
conditions allows us to uniquely determine the ratio of the hydrodynamic and
gyration radius as a function of the fractal dimension of the aggregate,
enabling us to elucidate the internal structure of the aggregates as a function
of the interaction potential. We find that the mass is evenly distributed in
all objects with fractal dimension ranging from 2.55 for a shallow to 1.75 for
the deepest potential.


title:
Asymptotic behavior of compositions of under-relaxed nonexpansive
  operators

abstract:
  In general there exists no relationship between the fixed point sets of the
composition and of the average of a family of nonexpansive operators in Hilbert
spaces. In this paper, we establish an asymptotic principle connecting the
cycles generated by under-relaxed compositions of nonexpansive operators to the
fixed points of the average of these operators. In the special case when the
operators are projectors onto closed convex sets, we prove a conjecture by De
Pierro which has so far been established only for projections onto affine
subspaces.


title:
Maximizing Spin Torque Diode Voltage by Optimizing Magnetization
  Alignment

abstract:
  The optimum condition of the magnetization alignment to maximize the spin
torque diode voltage is derived by solving the Landau-Lifshitz-Gilbert
equation. We show that the optimized diode voltage can be one order of
magnitude larger than that of the conventional alignment where the easy axes of
the free and the pinned layers are parallel. These analytical predictions are
confirmed by numerical simulations.


title: Decay Property of Axial-Vector Tetra-Quark Mesons

abstract:
  Decay property of hidden-charm tetra-quark mesons is studied. It is seen that
estimated width of iso-triplet odd $\mathcal{C}$ partners of X(3872), although
still crude, is compatible with the measured ones of Z_c(3900). It is pointed
out that confirmation of an eta-pi^0 peak around 3.2 GeV indicated in
gamma-gamma collisions gives a clue to select a realistic model of multi-quark
mesons.


title: Microphysics of cosmic ray driven plasma instabilities

abstract:
  Energetic nonthermal particles (cosmic rays, CRs) are accelerated in
supernova remnants, relativistic jets and other astrophysical objects. The CR
energy density is typically comparable with that of the thermal components and
magnetic fields. In this review we discuss mechanisms of magnetic field
amplification due to instabilities induced by CRs. We derive CR kinetic and
magnetohydrodynamic equations that govern cosmic plasma systems comprising the
thermal background plasma, comic rays and fluctuating magnetic fields to study
CR-driven instabilities. Both resonant and non-resonant instabilities are
reviewed, including the Bell short-wavelength instability, and the firehose
instability. Special attention is paid to the longwavelength instabilities
driven by the CR current and pressure gradient. The helicity production by the
CR current-driven instabilities is discussed in connection with the dynamo
mechanisms of cosmic magnetic field amplification.


title:
Preparation and characterization of Bismaleimide resin/titania
  nanocomposites via sol-gel process

abstract:
  Bismaleimide (BMI) resin/ titania nanocomposites were synthesized from
allylated-phenolic modified bismaleimide resin and TiO2 via the sol-gel process
of tetrabutyltitanate (Ti(OnBu)4, TBT). These nanocomposite materials were
characterized by FT-IR, XRD, FE-SEM, TGA and DMA. It was found that the
nano-scale TiO2 particles were formed in the AP-BMI resin matrix, and the
average primary particle size of the dispersed phase in the nanocomposites was
less than 100nm, but the particle aggregates with bigger size existed. Obvious
improvements of glass transition temperature and heat resistance properties of
the AP-BMI resins were achieved by the introduction of nano-sized TiO2
inorganic phase, and the modulus of the material was also improved.


title: Asteroid rotation excitation by subcatastrophic impacts

abstract:
  Photometric observations of asteroids show that some of them are in
non-principal axis rotation state (free precession), called tumbling.
Collisions between asteroids have been proposed as a possible asteroid rotation
excitation mechanism. We simulated subcatastrophic collisions between asteroids
of various physical and material parameters to find out whether they could be
responsible for the excited rotation. For every simulated target body after the
collision, we computed its rotational lightcurve and we found that tumbling was
photometrically detectable for the rotational axis misalignment angle \beta
greater than about 15 deg. We found that subcatastrophic collisions are a
plausible cause of non-principal axis rotation for small slowly rotating
asteroids. The determining parameter is the ratio of the projectile orbital
angular momentum to the target rotational angular momentum and we derived an
approximate relation between this ratio and the angle \beta. We also compared
the limiting energy for the onset of tumbling with the shattering energy.
Slowly rotating asteroids of diameter 100 m and larger can be rotationally
excited by collisions with energies below the shattering limit.


title:
Orbital stability of peakons for a generalized Camassa-Holm equation
  with both quadratic and cubic nonlinearity

abstract:
  In this paper, we investigate the orbital stability problem of peakons for a
modified Camassa-Holm equation with both quadratic and cubic nonlinearity. This
equation was derived from integrable theory and admits peaked soliton (peakon)
and multipeakon solutions. By constructing two suitable piecewise functions, we
establish the polynomial inequality relating to two conserved quantities and
the maximum of the solution to this equation. The error estimate between the
maximum of the solution and the peakon then follows from the structure of the
polynomial inequality. Finally, we prove that a wave starting close to the
peakon remains close to some translate of it at all later times, that is, the
shapes of these peakons are stable under small perturbations.


title:
Entropy for curvature squared gravity using surface term and auxiliary
  field

abstract:
  We compute the entropies for general curvature squared gravities in arbitrary
dimensions using the conserved charge and Virasoro algebra from surface term.
We introduce an auxiliary tensor field in order to obtain the boundary action
which establish a variational principle. Our results reproduce those in some
specific models, that is, the Gauss-Bonnet, new massive gravity (NMG), and
critical gravity.


title: An interesting example for spectral invariants

abstract:
  In "Illinois J. of Math. {\bf 38} (1994) 653--678", the heat operator of a
Bismut superconnection for a family of generalized Dirac operators is defined
along the leaves of a foliation with Hausdorff groupoid. The Novikov-Shubin
invariants of the Dirac operators were assumed greater than three times the
codimension of the foliation. It was then showed that the associated heat
operator converges to the Chern character of the index bundle of the operator.
In "J. K-Theory {\bf 1} (2008) 305--356", we improved this result by reducing
the requirement on the Novikov-Shubin invariants to one half of the
codimension. In this paper, we construct examples which show that this is the
best possible result.


title:
The effect of Coulomb interactions on the disorder driven
  superconductor-insulator transition: THz versus tunneling spectroscopy

abstract:
  The interplay between disorder and superconductivity has intrigued physicists
for decades. Of particular interest is the influence of disorder on the
superconducting energy gap $\Delta$. In the absence of Coulomb interactions
between electrons, disorder leads to emergent granularity of the local order
parameter resulting in a pseudogap at temperatures above the critical
temperature $T_c$, as well as a finite gap $\Delta$ on the insulating side of
the disorder-driven superconductor-insulator transition (SIT). At the same
time, disorder also enhances the Coulomb interactions, which subsequently may
influence $\Delta$ in a manner that is still not fully understood. Here we
investigate the evolution of the energy gap through the SIT by two different
experimental methods: tunneling spectroscopy, in which a metallic electrode is
placed close to the studied sample thus screening the Coulomb interactions, and
terahertz (THz) spectroscopy, which probes the unscreened sample. The
comparison between the two methods illustrates the role played by electronic
interactions in determining the nature of the phases across the SIT and sheds
light on the mechanisms involved in the destruction of superconductivity.


title:
First evidence of interaction between longitudinal and transverse waves
  in solar magnetic elements

abstract:
  Small-scale magnetic fields are thought to play an important role in the
heating of the outer solar atmosphere. By taking advantage of the unprecedented
high-spatial and temporal cadence of IMaX, the filter vector polarimeter on
board the Sunrise balloon-borne observatory, we study the transversal and
longitudinal velocity oscillations in small magnetic elements. The results of
this analysis are then compared to MHD simulations, showing excellent
agreement. We found buffeting-induced transverse oscillations with velocity
amplitudes of the order of 1-2 km/s, to be common along with longitudinal
oscillations with amplitudes 0.4 km/s. Moreover, we also found an interaction
between transverse oscillations and longitudinal velocity oscillations, showing
a +-90 degrees phase lag at the frequency at which they exhibit the maximum
coherence in the power spectrum. Our results are consistent with the
theoretical picture in which MHD longitudinal waves are excited inside small
magnetic elements as a response of the flux tube to the forcing action of the
granular flows.


title:
Signature of gate-tunable magnetism in graphene grafted with
  Pt-porphyrins

abstract:
  Inducing magnetism in graphene holds great promises, such as controlling the
exchange interaction with a gate electrode and generating exotic magnetic
phases. Coating graphene with magnetic molecules or atoms has so far mostly
lead to decreased graphene mobility. In the present work, we show that
Pt-porphyrins adsorbed on graphene lead to an enhanced mobility and to
gate-dependent magnetism. We report that porphyrins can be donor or acceptor,
depending on graphene s initial doping. The porphyrins transfer charge and
ionize around the charged impurities on graphene, decreasing the graphene
doping and increasing its mobility. In addition, ionized porphyrins carry a
magnetic moment. Using the sensitivity of mesoscopic transport to magnetism, in
particular the superconducting proximity effect and conductance fluctuations,
we explore the magnetic order induced in graphene by the interacting magnetic
moments of the ionized porphyrins. Among the signatures of magnetism, we find
two-terminal-magnetoresistance fluctuations with an odd component, a tell-tale
sign of time reversal symmetry breaking at zero field, that does not exist in
uncoated graphene sample. When graphene is connected to superconducting
electrodes, the induced magnetism leads to a gate-voltage-dependent suppression
of the supercurrent, modified magnetic interference patterns, and
gate-voltage-dependent magnetic hysteresis. The magnetic signatures are
greatest for long superconductor graphene superconductor junctions and for
samples with the highest initial doping, compatible with a greater number of
ionized and thus magnetic porphyrins. Our findings suggest that long-range
magnetism is induced through graphene by the ionized porphyrins magnetic
moment. This magnetic interaction is controlled by the density of carriers in
graphene, a tunability that could be exploited in spintronic applications.


title:
The discrepancy in the muon $g - 2$ is a non-perturbative effect of the
  Standard Model

abstract:
  The non-perturbative approach based on Bogoliubov compensation principle is
applied to the calculation of a contribution to the muon $g-2$. Using the
previous results on the spontaneous generation of the effective anomalous
three-boson interaction the contribution is calculated and shown to be in
agreement with the well-known discrepancy. The calculated quantity contains no
adjusting parameters but the experimental values for the muon and the W-boson
masses.


title: Strong magnon softening in tetragonal FeCo compounds

abstract:
  Magnons play an important role in fast precessional magnetization reversal
processes serving as a heat bath for dissipation of the Zeeman energy and thus
being responsible for the relaxation of magnetization. Employing \emph{ab
initio} many-body perturbation theory we studied the magnon spectra of the
tetragonal FeCo compounds considering three different experimental $c/a$
ratios, $c/a=$1.13, 1.18, and 1.24 corresponding to FeCo grown on Pd, Ir, and
Rh, respectively. We find that for all three cases the short-wave-length
magnons are strongly damped and tetragonal distortion gives rise to a
significant magnon softening. The magnon stiffness constant $D$ decreases
almost by a factor of two from FeCo/Pd to FeCo/Rh. The combination of soft
magnons together with the giant magnetic anisotropy energy suggests FeCo/Rh to
be a promising material for perpendicular magnetic recording applications.


title:
Direct measurement of the biphoton Wigner function through two-photon
  interference

abstract:
  The Hong-Ou-Mandel (HOM) experiment was a benchmark in quantum optics,
evidencing the quantum nature of the photon. In order to go deeper, and obtain
the complete information about the quantum state of a system, for instance,
composed by photons, the direct measurement or reconstruction of the Wigner
function or other quasi--probability distribution in phase space is necessary.
In the present paper, we show that a simple modification in the well-known HOM
experiment provides the direct measurement of the Wigner function. We apply our
results to a widely used quantum optics system, consisting of the biphoton
generated in the parametric down conversion process. In this approach, a
negative value of the Wigner function is a sufficient condition for
non-gaussian entanglement between two photons. In the general case, the Wigner
function provides all the required information to infer entanglement using well
known necessary and sufficient criteria. We analyze our results using two
examples of parametric down conversion processes taken from recent experiments.
The present work offers a new vision of the HOM experiment that further
develops its possibilities to realize fundamental tests of quantum mechanics
involving decoherence and entanglement using simple optical set-ups.


title:
Improvement of N_f=3 lattice QCD with Wilson fermions and tree-level
  improved gauge action

abstract:
  We determine the parameter c_SW required for O(a)-improvement of the three
flavor Wilson fermion action together with the tree-level Symanzik improved
gauge action. The standard improvement condition is employed for a range of
couplings. Additionally, we perform a check of the volume independence of c_SW
and provide a preliminary estimate of the lattice spacing at our largest values
of g_0^2.


title: A new Watermarking Technique for Secure Database

abstract:
  Digital multimedia watermarking technology was suggested in the last decade
to embed copyright information in digital objects such images, audio and video.
However, the increasing use of relational database systems in many real-life
applications created an ever increasing need for watermarking database systems.
As a result, watermarking relational database systems is now merging as a
research area that deals with the legal issue of copyright protection of
database systems. Approach: In this study, we proposed an efficient database
watermarking algorithm based on inserting binary image watermarks in
non-numeric mutli-word attributes of selected database tuples. Results: The
algorithm is robust as it resists attempts to remove or degrade the embedded
watermark and it is blind as it does not require the original database in order
to extract the embedded watermark. Conclusion: Experimental results
demonstrated blindness and the robustness of the algorithm against common
database attacks.


title:
Proximity Factors of Lattice Reduction-Aided Precoding for Multiantenna
  Broadcast

abstract:
  Lattice precoding is an effective strategy for multiantenna broadcast. In
this paper, we show that approximate lattice precoding in multiantenna
broadcast is a variant of the closest vector problem (CVP) known as $\eta$-CVP.
The proximity factors of lattice reduction-aided precoding are defined, and
their bounds are derived, which measure the worst-case loss in power efficiency
compared to sphere precoding. Unlike decoding applications, this analysis does
not suffer from the boundary effect of a finite constellation, since the
underlying lattice in multiantenna broadcast is indeed infinite.


title: A Novel approach for Hybrid Database

abstract:
  In the current world of economic crises, the cost control is one of the chief
concerns for all types of industries, especially for the small venders. The
small vendors are suppose to minimize their budget on Information Technology by
reducing the initial investment in hardware and costly database servers like
ORACLE, SQL Server, SYBASE, etc. for the purpose of data processing and
storing. In other divisions, the electronic devices manufacturing companies
want to increase the demand and reduce the manufacturing cost by introducing
the low cost technologies. The new small devices like ipods, iphones, palm top
etc. are now-a-days used as data computation and storing tools. For both the
cases mentioned above, instead of going for the costly database servers which
additionally requires extra hardware as well as the extra expenses in training
and handling, the flat file may be considered as a candidate due to its easy
handling nature, fast accessing, and of course free of cost. But the main
hurdle is the security aspects which are not up to the optimum level. In this
paper, we propose a methodology that combines all the merit of the flat file
and with the help of a novel steganographic technique we can maintain the
utmost security fence. The new proposed methodology will undoubtedly be highly
beneficial for small vendors as well as for the above said electronic devices
manufacturer


title: A New Model of Holographic QCD and Chiral Condensate in Dense Matter

abstract:
  We consider the model of holographic QCD with asymptotic freedom and gluon
condensation in its vacuum. It consists of the color D4-branes and D0-branes as
a background and the flavor D8-branes as a probe. By taking a specific field
theory limit, the effective coupling decreases to vanish in UV region. We then
introduce the uniformly distributed baryons in terms of the baryon vertices and
study the density dependence of chiral condensate, which is evaluated using the
worldsheet instanton method. In the confined phase, the chiral condensate as a
function of density monotonically decreases in high baryon density. Such
behavior is in agreement with the expectation, while in extremely low density
it increases. We attribute this anomaly to the incorrect approximation of
uniformity in very low density. In the deconfined phase the chiral condensate
monotonically decreases in the whole region of density.


title:
Measurement of the production cross section of jets in association with
  a Z boson in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector

abstract:
  Measurements of the production of jets of particles in association with a Z
boson in pp collisions at sqrt(s) = 7 TeV are presented, using data
corresponding to an integrated luminosity of 4.6/fb collected by the ATLAS
experiment at the Large Hadron Collider. Inclusive and differential jet cross
sections in Z events, with Z decaying into electron or muon pairs, are measured
for jets with transverse momentum pT > 30 GeV and rapidity |y| < 4.4. The
results are compared to next-to-leading-order perturbative QCD calculations,
and to predictions from different Monte Carlo generators based on leading-order
and next-to-leading-order matrix elements supplemented by parton showers.


title: Simple groups and the number of countable models

abstract:
  Let $T$ be a complete, superstable theory with fewer than $2^{\aleph_{0}}$
countable models. Assuming that generic types of infinite, simple groups
definable in $T^{eq}$ are sufficiently non-isolated we prove that
$\omega^{\omega}$ is the strict upper bound for the Lascar rank of $T$.


title: Dynamics of Entanglement Entropy from Einstein Equation

abstract:
  We study the dynamics of entanglement entropy for weakly excited states in
conformal field theories by using the AdS/CFT. This is aimed at a first step to
find a counterpart of Einstein equation in the CFT language. In particular, we
point out that the entanglement entropy satisfies differential equations which
directly correspond to the Einstein equation in several setups of AdS/CFT. We
also define a quantity called entanglement density in higher dimensional field
theories and study its dynamical property for weakly excited states in
conformal field theories.


title:
GMRT discovery of PSR J1544+4937, an eclipsing black-widow pulsar
  identified with a Fermi LAT source

abstract:
  Using the Giant Metrewave Radio Telescope (GMRT) we performed deep
observations to search for radio pulsations in the directions of unidentified
Fermi Large Area Telescope (LAT) gamma-ray sources. We report the discovery of
an eclipsing black-widow millisecond pulsar, PSR J1544+4937, identified with
the un-cataloged gamma-ray source Fermi J1544.2+4941. This 2.16 ms pulsar is in
a 2.9 hours compact circular orbit with a very low-mass companion (Mc > 0.017
Msun). At 322 MHz this pulsar is found to be eclipsing for 13% of its orbit,
whereas at 607 MHz the pulsar is detected throughout the low-frequency eclipse
phase. Variations in the eclipse ingress phase are observed, indicating a
clumpy and variable eclipsing medium. Moreover, additional short-duration
absorption events are observed around the eclipse boundaries. Using the radio
timing ephemeris we were able to detect gamma-ray pulsations from this pulsar,
confirming it as the source powering the gamma-ray emission.


title: From field theory to superfluid hydrodynamics of dense quark matter

abstract:
  Hydrodynamics of superfluids can be described by formally dividing the fluid
into a normal fluid and a superfluid part. In color-flavor locked quark matter,
at least one superfluid component is present due to spontaneous breaking of
baryon number conservation, and an additional one due to the breaking of
strangeness arises once one takes into account kaon condensation. We show how
such a two-component description emerges from an underlying scalar field theory
which can be viewed as an effective theory for kaons. Furthermore, the
occurring hydrodynamic quantities in the low-temperature limit are related to
the microscopic parameters provided by the Lagrangian which closes the gap
between field theory and hydrodynamics, which are important for astrophysical
calculations.


title:
Detailed abundance study of four s-process enriched post-AGB stars in
  the Large Magellanic Cloud

abstract:
  Stellar photospheres of post-asymptotic giant branch stars bear witness to
the internal chemical enrichment processes, integrated over their entire
stellar evolution. Here we study post-AGB stars in the Large Magellanic Cloud
(LMC). With their known distances, these rare objects are ideal tracers of AGB
nucleosynthesis and dredge-up phenomena.
  We used the UVES spectrograph mounted on the Very Large Telescope (VLT) at
the European Southern Observatory (ESO), to obtain high-resolution spectra with
high signal-to-noise (S/N) of a sample of four post-AGB stars. The objects
display a spectral energy distribution (SED) that indicates the presence of
circumstellar dust.
  All objects are carbon-rich, and strongly enhanced in s-process elements. We
deduced abundances of heavy s-process elements for all stars in the sample, and
even found an indication of the presence of Hg in the spectrum of one object.
The metallicity of all stars except J053253.51-695915.1 is considerably lower
than the average value that is observed for the LMC. The derived luminosities
show that we witness the late evolution of low-mass stars with initial masses
close to 1 solar mass. An exception is J053253.51-695915.1 and we argue that
this object is likely a binary.
  We confirmed the correlation between the efficiency of the third-dredge up
and the neutron exposure that is detected in Galactic post-AGB stars. The
non-existence of a correlation between metallicity and neutron irradiation is
also confirmed and expanded to smaller metallicities. We confirm the status of
21-micron stars as post-Carbon stars. Current theoretical AGB models
overestimate the observed C/O ratios and fail to reproduce the variety of
s-process abundance patterns that is observed in otherwise very similar
objects. Similar results have recently been found for a post-AGB star in the
Small Magellanic Cloud (SMC).


title: Dynamical Black Holes in 2+1 Dimensions

abstract:
  We investigate the global structure of a recently discovered simple exact,
non-stationary solution of topologically massive and new massive gravity with
the asymptotic charges of an undeformed BTZ black hole. We establish the
existence of a timelike singularity in the causal structure of the spacetime
even in the absence of angular momentum. The dynamical trapping and event
horizons are determined and we investigate the evolution of the outer horizon
showing that it may increase or decrease with time, depending on the value of
the mass parameter. Finally, we test two proposals for dynamical entropy on
this solution, one of them depending on the Kodama vector. In addition we show
that the Kodama vector leads to the correct entropy for all stationary black
holes in 2+1 dimensions.


title:
Access structure in graphs in high dimension and application to secret
  sharing

abstract:
  We give graphical characterisation of the access structure to both classical
and quantum information encoded onto a multigraph defined for prime dimension
$q$, as well as explicit decoding operations for quantum secret sharing based
on graph state protocols. We give a lower bound on $k$ for the existence of a
$((k,n))_q$ scheme and prove, using probabilistic methods, that there exists
$\alpha$ such that a random multigraph has an accessing parameter $k\leq \alpha
n$ with high probability.


title: On representations of quantum conjugacy classes of GL(n)

abstract:
  Let $O$ be a closed Poisson conjugacy class of the complex algebraic Poisson
group GL(n) relative to the Drinfeld-Jimbo factorizable classical r-matrix.
Denote by $T$ the maximal torus of diagonal matrices in GL(n). With every $a\in
O\cap T$ we associate a highest weight module $M_a$ over the quantum group
$U_q(gl(n))$ and an equivariant quantization $C_{h,a}[O]$ of the polynomial
ring $C[O]$ realized by operators on $M_a$. All quantizations $C_{h,a}[O]$ are
isomorphic and can be regarded as different exact representations of the same
algebra, $C_{h}[O]$. Similar results are obtained for semisimple adjoint orbits
in $gl(n)$ equipped with the canonical GL(n)-invariant Poisson structure.


title: Moon night sky brightness simulation for Xinglong station

abstract:
  With a sky brightness monitor in Xinglong station of National Astronomical
Observatories of China (NAOC), we collected data from 22 dark clear nights and
90 lunar nights. We first measured the sky brightness variation with time in
dark nights, found a clear correlation between the sky brightness and human
activity. Then with a modified sky brightness model of moon night and data from
moon night, we derived the typical value for several important parameters in
the model. With these results, we calculated the sky brightness distribution
under a given moon condition for Xinglong station. Furthermore, we simulated
the moon night sky brightness distribution in a 5 degree field of view
telescope (such as LAMOST). These simulations will be helpful to determine the
magnitude limit, exposure time as well as the survey design for LAMOST at lunar
night.


title: Spontaneous formation of double bars in dark matter dominated galaxies

abstract:
  Although nearly one-third of barred galaxies host an inner, secondary bar,
the formation and evolution of double barred galaxies remain unclear. We show
here an example model of a galaxy, dominated by a live dark matter halo, in
which double bars form naturally, without requiring gas, and we follow its
evolution for a Hubble time. The inner bar in our model galaxy rotates almost
as slowly as the outer bar, and it can reach up to half of its length. The
route to the formation of a double bar may be different from that of a single
strong bar. Massive dark matter halo or dynamically hot stellar disc may play
an important role in the formation of double bars and their subsequent
evolution.


title: Reconstructing protein binding patterns from ChIP time-series

abstract:
  Motivation Gene transcription requires the orchestrated binding of various
proteins to the promoter of a gene. The binding times and binding order of
proteins allow to draw conclusions about the proteins' exact function in the
recruitment process. Time-resolved ChIP experiments are being used to analyze
the order of protein binding for these processes. However, these ChIP signals
do not represent the exact protein binding patterns. Results We show that for
promoter complexes that follow sequential recruitment dynamics the ChIP signal
can be understood as a convoluted signal and propose the application of
deconvolution methods to recover the protein binding patterns from experimental
ChIP time-series. We analyze the suitability of four deconvolution methods: two
non-blind deconvolution methods, Wiener deconvolution and Lucy-Richardson
deconvolution, and two blind deconvolution methods, blind Lucy-Richardson
deconvolution and binary blind deconvolution. We apply these methods to infer
the protein binding pattern from ChIP time-series for the pS2 gene.


title:
The Herschel-PEP survey: evidence for downsizing in the hosts of dusty
  star-forming systems

abstract:
  By making use of Herschel-PEP observations of the COSMOS and Extended Groth
Strip fields, we have estimated the dependence of the clustering properties of
FIR-selected sources on their 100um fluxes. Our analysis shows a tendency for
the clustering strength to decrease with limiting fluxes: r0(S100um >8 mJy)~4.3
Mpc and r0(S100um >5 mJy)~5.8 Mpc. These values convert into minimum halo
masses Mmin~10^{11.6} Msun for sources brighter than 8 mJy and Mmin~10^{12.4}
Msun for S100um > 5 mJy galaxies. We show such an increase of the clustering
strength to be due to an intervening population of z~2 sources, which are very
strongly clustered and whose relative contribution, equal to about 10% of the
total counts at S100um > 2 mJy, rapidly decreases for brighter flux cuts. By
removing such a contribution, we find that z <~ 1 FIR galaxies have
approximately the same clustering properties, irrespective of their flux level.
The above results were then used to investigate the intrinsic dependence on
cosmic epoch of the clustering strength of dusty star-forming galaxies between
z~0 and z~2.5. In order to remove any bias in the selection process, the
adopted sample only includes galaxies observed at the same rest-frame
wavelength, lambda~60 um, which have comparable luminosities and therefore
star-formation rates (SFR>~100 Msun/yr). Our analysis shows that the same
amount of (intense) star forming activity takes place in extremely different
environments at the different cosmological epochs. For z<~1 the hosts of such
star forming systems are small, Mmin~10^{11} Msun, isolated galaxies. High
(z~2) redshift star formation instead seems to uniquely take place in extremely
massive/cluster-like halos, Mmin~10^{13.5} Msun, which are associated with the
highest peaks of the density fluctuation field at those epochs. (abridged)


title:
Study of the pulse power supply unit for the four-horn system of the
  CERN to Frejus neutrino super beam

abstract:
  The power supply studies for the four-horn system for the CERN to Fr\'ejus
neutrino Super Beam oscillation experiment are discussed here. The power supply
is being studied to meet the physics potential and the mega-watt (MW) power
requirements of the proton driver of the Super Beam. A one-half sinusoid
current waveform with a 350 kA maximum current and pulse length of 100 \mu s at
50 Hz frequency is generated and distributed to four-horns. In order to provide
the necessary current needed to focus the charged mesons producing the neutrino
beam, a bench of capacitors is charged at 50 Hz frequency to a +12 kV reference
voltage and then discharged through a large switch to each horn via a set of
strip-lines at the same rate. A current recovery stage allows to invert rapidly
the negative voltage of the capacitor after the discharging stage in order to
recuperate large part of the injected energy and thus to limit the power
consuption. The energy recovery efficiency of that system is very high at 97%.
For feasibility reasons, a modular architecture has been adopted with 8 modules
connected in parallel to deliver 44 kA peak currents into the four-horn system.


title: A portrait of the extreme Solar System object 2012 DR30

abstract:
  2012 DR30 is a recently discovered Solar System object on a unique orbit,
with a high eccentricity of 0.9867, a perihelion distance of 14.54 AU and a
semi-major axis of 1109 AU, in this respect outscoring the vast majority of
trans-Neptunian objects. We performed Herschel/PACS and optical photometry to
uncover the size and albedo of 2012 DR30, together with its thermal and surface
properties. The body is 185 km in diameter and has a relatively low V-band
geometric albedo of ~8%. Although the colours of the object indicate that 2012
DR30 is an RI taxonomy class TNO or Centaur, we detected an absorption feature
in the Z-band that is uncommon among these bodies. A dynamical analysis of the
target's orbit shows that 2012 DR30 moves on a relatively unstable orbit and
was most likely only recently placed on its current orbit from the most distant
and still highly unexplored regions of the Solar System. If categorised on
dynamical grounds 2012 DR30 is the largest Damocloid and/or high inclination
Centaur observed so far.


title:
Optical determination and identification of organic shells around
  nanoparticles: application to silver nanoparticles

abstract:
  We present a simple method to prove the presence of an organic shell around
silver nanoparticles. This method is based on the comparison between optical
extinction measurements of isolated nanoparticles and Mie calculations
predicting the expected wavelength of the Localized Surface Plasmon Resonance
of the nanoparticles with and without the presence of an organic layer. This
method was applied to silver nanoparticles which seemed to be well protected
from oxidation. Further experimental characterization via Surface Enhanced
Raman Spectroscopy (SERS) measurements allowed to identify this protective
shell as ethylene glycol. Combining LSPR and SERS measurements could thus give
proof of both presence and identification for other plasmonic nanoparticles
surrounded by organic shells.


title:
Ankle-like Feature in the Energy Spectrum of Light Elements of Cosmic
  Rays Observed with KASCADE-Grande

abstract:
  Recent results of the KASCADE-Grande experiment provided evidence for a mild
knee-like structure in the all-particle spectrum of cosmic rays at $E =
10^{16.92 \pm 0.10} \, \mathrm{eV}$, which was found to be due to a steepening
in the flux of heavy primary particles. The spectrum of the combined components
of light and intermediate masses was found to be compatible with a single power
law in the energy range from $10^{16.3} \, \mathrm{eV}$ to $10^{18} \,
\mathrm{eV}$. In this paper, we present an update of this analysis by using
data with increased statistics, originating both from a larger data set
including more recent measurements and by using a larger fiducial area. In
addition, optimized selection criteria for enhancing light primaries are
applied. We find a spectral feature for light elements, namely a hardening at
$E = 10^{17.08 \pm 0.08} \, \mathrm{eV}$ with a change of the power law index
from $-3.25 \pm 0.05$ to $-2.79 \pm 0.08$.


title: The high-energy spectrum of 3C 273

abstract:
  The high energy spectral shape of 3C 273 is usually understood in terms of
Inverse-Compton emission in a relativistic leptonic jet. This model predicts
variability patterns and delays which could be tested if simultaneous
observations are available from the infrared to the GeV range. The instruments
IBIS, SPI, JEM-X on board INTEGRAL, PCA on board RXTE and LAT on board Fermi
have enough sensitivity to follow the spectral variability from the keV to the
GeV and to compare them with model predictions. We are presenting preliminary
results on the high energy spectrum of 3C 273 and its variability and compare
these results to predictions. We found that a single component is not able to
adequately fit the multiwavelength spectrum (5 keV - 10 GeV) when the
statistics in Fermi data is sufficient to constraint {\gamma}-ray emission.
This suggests that the X-rays emission is not originated in the jet. A possible
explanation could be that X-rays are dominated by a Seyfert-like thermal
inverse Compton.


title: Transitivity of automorphism groups of Gizatullin surfaces

abstract:
  We show that the automorphism group of a certain subclass of smooth
Gizatullin surfaces with a distinguished and rigid extended divisor is
generated by automorphisms of A1-fibrations. Moreover, such surfaces provide
examples of smooth Gizatullin surfaces with a non-transitive action of the
automorphism group. Thus, they represent counterexamples to Gizatullin's
conjecture. For such surfaces we give explicit orbits of the natural action of
the automorphism group in some special cases. Further, we present their
automorphism groups as amalgamated products of two subgroups.


title: Homological smoothness and deformations of generalized Weyl algebras

abstract:
  It is an immediate conclusion from Bavula's papers \cite{Bavula:GWA-def},
\cite{Bavula:GWA-tensor-product} that if a generalized Weyl algebra
$A=\kk[z;\lambda,\eta,\varphi(z)]$ is homologically smooth, then the polynomial
$\varphi(z)$ has no multiple roots. We prove in this paper that the converse is
also true. Moreover, formal deformations of $A$ are studied when $\kk$ is of
characteristic zero.


title:
Synthesis of neural networks for spatio-temporal spike pattern
  recognition and processing

abstract:
  The advent of large scale neural computational platforms has highlighted the
lack of algorithms for synthesis of neural structures to perform predefined
cognitive tasks. The Neural Engineering Framework offers one such synthesis,
but it is most effective for a spike rate representation of neural information,
and it requires a large number of neurons to implement simple functions. We
describe a neural network synthesis method that generates synaptic connectivity
for neurons which process time-encoded neural signals, and which makes very
sparse use of neurons. The method allows the user to specify, arbitrarily,
neuronal characteristics such as axonal and dendritic delays, and synaptic
transfer functions, and then solves for the optimal input-output relationship
using computed dendritic weights. The method may be used for batch or online
learning and has an extremely fast optimization process. We demonstrate its use
in generating a network to recognize speech which is sparsely encoded as spike
times.


title: New constraints on Coupled Dark Energy from Planck

abstract:
  We present new constraints on coupled dark energy from the recent
measurements of the Cosmic Microwave Background Anisotropies from the Planck
satellite mission. We found that a coupled dark energy model is fully
compatible with the Planck measurements, deriving a weak bound on the dark
matter-dark energy coupling parameter \xi=-0.49^{+0.19}_{-0.31} at 68% c.l..
Moreover if Planck data are fitted to a coupled dark energy scenario, the
constraint on the Hubble constant is relaxed to H_0=72.1^{+3.2}_{-2.3}
km/s/Mpc, solving the tension with the Hubble Space Telescope value. We show
that a combined Planck+HST analysis provides significant evidence for coupled
dark energy finding a non-zero value for the coupling parameter \xi, with
-0.90< \xi <-0.22 at 95% c.l.. We also consider the combined constraints from
the Planck data plus the BAO measurements of the 6dF Galaxy Survey, the Sloan
Digital Sky Survey and the Baron Oscillation Spectroscopic Survey.


title:
Dust formation in the winds of AGBs: the contribution at low
  metallicities

abstract:
  We present new models for the evolution of stars with mass in the range 1Msun
< M < 7.5Msun, followed from the pre-main-sequence through the asymptotic giant
branch phase. The metallicity adopted is $Z=3*10^{-4} (which, with an
alpha-enhancement of +0.4, corresponds to [Fe/H]=-2). Dust formation is
described by following the growth of dust grains of various types as the wind
expands from the stellar surface.
  Models with mass M>3Msun experience Hot Bottom Burning, thus maintaining the
surface C/O below unity. Unlike higher Z models, the scarcity of silicon
available in the envelope prevents the formation of silicates in meaningful
quantities, sufficient to trigger the acceleration of the wind via radiation
pressure on the dust grains formed. No silicate formation occurs below a
threshold metallicity of Z=10^{-3}.
  Low--mass stars, with M< 2.5Msun become carbon stars, forming solid carbon
dust in their surroundings. The total dust mass formed depends on the uncertain
extent of the inwards penetration of the convective envelope during the Third
Dredge--Up episodes following the Thermal Pulses. Carbon grains have sizes 0.08
micron < a_C < 0.12 micron and the total amount of dust formed (increasing with
the mass of the star) is M_C=(2-6)*10^{-4}Msun.
  Our results imply that AGB stars with Z=3*10^{-4} can only contribute to
carbon dust enrichment of the interstellar medium on relatively long
timescales, > 300 Myr, comparable to the evolutionary time of a 3Msun star. At
lower metallicities the scarcity of silicon available and the presence of Hot
Bottom Burning even in M< 2Msun, prevents the formation of silicate and carbon
grains. We extrapolate our conclusion to more metal--poor environments, and
deduce that at Z < 10^{-4} dust enrichment is mostly due to metal condensation
in supernova ejecta.


title: Power-efficient Assignment of Virtual Machines to Physical Machines

abstract:
  Motivated by current trends in cloud computing, we study a version of the
generalized assignment problem where a set of virtual processors has to be
implemented by a set of identical processors. For literature consistency, we
say that a set of virtual machines (VMs) is assigned to a set of physical
machines (PMs). The optimization criteria is to minimize the power consumed by
all the PMs. We term the problem Virtual Machine Assignment (VMA). Crucial
differences with previous work include a variable number of PMs, that each VM
must be assigned to exactly one PM (i.e., VMs cannot be implemented
fractionally), and a minimum power consumption for each active PM. Such
infrastructure may be strictly constrained in the number of PMs or in the PMs'
capacity, depending on how costly (in terms of power consumption) is to add a
new PM to the system or to heavily load some of the existing PMs. Low usage or
ample budget yields models where PM capacity and/or the number of PMs may be
assumed unbounded for all practical purposes. We study 4 VMA problems depending
on whether the capacity or the number of PMs is bounded or not. Specifically,
we study hardness and online competitiveness for a variety of cases. To the
best of our knowledge, this is the first comprehensive study of the VMA problem
for this cost function.


title: A micro-structured ion-implanted magnonic crystal

abstract:
  We investigate spin-wave propagation in a microstructured magnonic-crystal
waveguide fabricated by localized ion implantation. The irradiation caused a
periodic variation in the saturation magnetization along the waveguide. As a
consequence, the spin-wave transmission spectrum exhibits a set of frequency
bands, where spin-wave propagation is suppressed. A weak modification of the
saturation magnetization by 7% is sufficient to decrease the spin-wave
transmission in the band gaps by a factor of 10. These results evidence the
applicability of localized ion implantation for the fabrication of efficient
micron- and nano-sized magnonic crystals for magnon spintronic applications.


title:
Proceedings International Workshop on the ACL2 Theorem Prover and its
  Applications

abstract:
  This volume contains the proceedings of the Eleventh International Workshop
on the ACL2 Theorem Prover and its Applications, held on May 30 and 31, 2013,
in Laramie, Wyoming, USA.
  ACL2 is an industrial-strength automated reasoning system, the latest in the
Boyer-Moore family of theorem provers. The ACL2 workshop is the major technical
forum for users of the ACL2 theorem proving system to present research on the
prover and its applications.
  This year's workshop received 15 submissions covering a wide range of
applications, libraries, prover enhancements, interfaces, and experience
reports. 11 papers were selected by the program committee for presentation at
the workshop.


title: Security threats in Prepaid Mobile

abstract:
  Recent communications environment significantly expand the mobile
environment. Prepaid mobile services for 3G networks enables telecommunication
to sign up new users by utilizing the latest in converged billing technologies.
The worldwide mobile communication market is exploding, and 50 percent of
subscribers are expected to use prepaid billing . Prepaid services are driving
mobile communication into emerging markets such as South America, Eastern
Europe, Asia, Africa and Gulf Countries. Prepaid phone service requires a user
to make payment before calling. It is quite common to get prepaid SIM cards on
every major Network. This paper discuss about various prepaid techniques,
challenges and countermeasures in prepaid mobile communication system .


title:
Beyond the mesh handling Maxwell's curl equations with an
  unconditionally leapfrog stable scheme

abstract:
  Numerical solution of equations governing time domain simulations in
computational electromagnetics, is usually based on grid methods in space and
on explicit schemes for the time evolution. A predefined grid in the problem
domain and a stability step size restriction must be accepted. Evidence is
given that efforts need for overcoming these heavy constraints. Recently, the
authors developed a meshless method to avoid the connective laws among the
points scattered in the problem domain. Despite the good spatial properties,
the numerical explicit integration used in the original formulation of the
method provides,also in a meshless context, spatial and time discretization
strictly interleaved and mutually conditioned. Afterwards, in this paper the
stability condition is firstly addressed in a general way by allowing the time
step increment get away from the minimum points spacing. Meanwhile, a
formulation of the alternating direction implicit scheme for the evolution in
time is combined with the meshless solver. The formulation preserves the
leapfrog marching on in time of the explicit integration scheme. The new
method, not constrained by a gridding in space and unconditionally stable in
time, is numerical assessed by different numerical simulations. Perfect
matching layer technique is used in simulating open spatial problems;
otherwise, a consistency restoring approach is introduced in treating
truncation at finite boundary and irregular points distribution. Three case
studies are investigated by achieving a satisfactory agreement comparing both
numerical and analytical results.


title: RAMSES-RT: Radiation hydrodynamics in the cosmological context

abstract:
  We present a new implementation of radiation hydrodynamics (RHD) in the
adaptive mesh refinement (AMR) code RAMSES. The multi-group radiative transfer
(RT) is performed on the AMR grid with a first-order Godunov method using the
M1 closure for the Eddington tensor, and is coupled to the hydrodynamics via
non-equilibrium thermochemistry of hydrogen and helium. This moment-based
approach has the large advantage that the computational cost is independent of
the number of radiative sources - it can even deal with continuous regions of
emission such as bound-free emission from gas. As it is built directly into
RAMSES, the RT takes natural advantage of the refinement and parallelization
strategies already in place. Since we use an explicit advection solver for the
radiative transport, the time step is restricted by the speed of light - a
severe limitation that can be alleviated using the so--called "reduced speed of
light" approximation. We propose a rigorous framework to assess the validity of
this approximation in various conditions encountered in cosmology and galaxy
formation. We finally perform with our newly developed code a complete suite of
RHD tests, comparing our results to other RHD codes. The tests demonstrate that
our code performs very well and is ideally suited for exploring the effect of
radiation on current scenarios of structure and galaxy formation.


title:
NESSiE: The Experimental Sterile Neutrino Search in Short-Base-Line at
  CERN

abstract:
  Several different experimental results are indicating the existence of
anomalies in the neutrino sector. Models beyond the standard model have been
developed to explain these results and involve one or more additional neutrinos
that do not weakly interact. A new experimental program is therefore needed to
study this potential new physics with a possibly new Short-Base-Line neutrino
beam at CERN. CERN is actually promoting the start up of a New Neutrino
Facility in the North Area site, which may host two complementary detectors,
one based on LAr technology and one corresponding to a muon spectrometer. The
system is doubled in two different sites. With regards to the latter option,
NESSiE, Neutrino Experiment with Spectrometers in Europe, had been proposed for
the search of sterile neutrinos studying Charged Current (CC) muon neutrino and
antineutrino ineractions. The detectors consists of two magnetic spectrometers
to be located in two sites:"Near" and "Far" from the proton target of the
CERN-SPS beam. Each spectrometer will be complemented by an ICARUS-like LAr
target in order to allow also Neutral Current (NC) and electron neutrino CC
interactions reconstruction.


title: Identities in modular arithmetic from reversible coherence operations

abstract:
  This paper investigates some issues arising in categorical models of
reversible logic and computation. Our claim is that the structural (coherence)
isomorphisms of these categorical models, although generally overlooked, have
decidedly non-trivial computational content. The theory of categorical
coherence is based around reversible structural operations (canonical
isomorphisms) that allow for transformations between related, but distinct,
mathematical structures. A number of coherence theorems are commonly used to
treat these transformations as though they are identity maps, from which point
onwards they play no part in computational models. We simply wish to point out
that doing so overlooks some significant computational content.
  We give a single example (taken from an uncountably infinite set of similar
examples, and based on structures used in models of reversible logic and
computation) of a category whose structural isomorphisms manipulate modulo
classes of natural numbers. We demonstrate that the coherence properties that
usually allow us to ignore these structural isomorphisms in fact correspond to
countably infinite families of non-trivial identities in modular arithmetic.
Further, proving the correctness of these equalities without recourse to the
theory of categorical coherence appears to be a hard task.


title: On twinning in smectic crystals

abstract:
  It is shown that mechanical twinning in smectic crystals is possible. The
structure of the boundary of twins for a small disorientation of crystallites
is determined. The periodic twin structure, which should appear at the tension
of the smectic layer, is proposed.


title: K-theory and exact sequences of partial translation algebras

abstract:
  In an earlier paper, the authors introduced partial translation algebras as a
generalisation of group C*-algebras. Here we establish an extension of partial
translation algebras, which may be viewed as an excision theorem in this
context. We apply this general framework to compute the K-theory of partial
translation algebras and group C*-algebras in the context of almost invariant
subspaces of discrete groups. This generalises the work of Cuntz, Lance,
Pimsner and Voiculescu. In particular we provide a new perspective on Pimsner's
calculation of the K-theory for a graph product of groups.


title:
A numerical method for imaging of biological microstructures by VHF
  waves

abstract:
  Imaging techniques give a fundamental support to medical diagnostics during
the pathology discovery as well as for the characterization of biological
structures. The imaging methods involve electromagnetic waves in a frequency
range that spans from some Hz to GHz and over. Most of these methods involve
scanning of wide human body areas even if only small areas need to be analyzed.
In this paper, a numerical method to evaluate the shape of micro-structures for
application in the medical field, with a very low invasiveness for the human
body, is proposed. A flexible thin-wire antenna radiates the VHF waves and
then, by measuring the spatial magnetic field distribution it is possible to
reconstruct the micro-structures image by estimating the location of the
antenna against a sensors panel. The typical inverse problem described above is
solved numerically, and first simulation results are presented in order to show
the validity and the robustness of the proposed approach.


title: Filament and Flare Detection in H{\alpha} image sequences

abstract:
  Solar storms can have a major impact on the infrastructure of the earth. Some
of the causing events are observable from ground in the H{\alpha} spectral
line. In this paper we propose a new method for the simultaneous detection of
flares and filaments in H{\alpha} image sequences. Therefore we perform several
preprocessing steps to enhance and normalize the images. Based on the intensity
values we segment the image by a variational approach. In a final
postprecessing step we derive essential properties to classify the events and
further demonstrate the performance by comparing our obtained results to the
data annotated by an expert. The information produced by our method can be used
for near real-time alerts and the statistical analysis of existing data by
solar physicists.


title: Conserved number fluctuations in a hadron resonance gas model

abstract:
  Net-baryon, net-charge and net-strangeness number fluctuations in high energy
heavy-ion collisions are discussed within the framework of a hadron resonance
gas (HRG) model. Ratios of the conserved number susceptibilities calculated in
HRG are being compared to the corresponding experimental measurements to
extract information about the freeze-out condition and the phase structure of
systems with strong interactions. We emphasize the importance of considering
the actual experimental acceptances in terms of kinematics (pseudorapidity
($\eta$) and transverse momentum ($p_{T}$)), the detected charge state, effect
of collective motion of particles in the system and the resonance decay
contributions before comparisons are made to the theoretical calculations. In
this work, based on HRG model, we report that the net-baryon number
fluctuations are least affected by experimental acceptances compared to the
net-charge and net-strangeness number fluctuations.


title: Effective Coulomb Logarithm for One Component Plasma

abstract:
  An expression for the effective Coulomb logarithm in one-component-plasma is
proposed, which allows to extend the applicability of the classical formula for
the self-diffusion coefficient to the strongly coupled regime. The proposed
analytical approximation demonstrates reasonable agreement with previous
numerical simulation results. Relevance to weakly screened Yukawa systems (and,
in particular, complex plasmas) is discussed.


title: One-loop quantum gravity from a worldline viewpoint

abstract:
  We develop a worldline approach to quantum gravity in D=4. Using the
background field method we consider the covariantly gauge fixed
Einstein-Hilbert action with cosmological constant, and find a worldline
representation of the differential operators identified by its quadratic
approximation. We test it by computing the correct one-loop divergencies.
Alternative worldline methods, such as the use of the O(4) spinning particle
that is known to describe correctly the propagation of a massless spin 2
particle in D=4, find obstructions in the coupling to an arbitrary background
metric, apparently preventing a more extensive use in perturbative descriptions
of quantum gravity. We expect that our model might simplify calculations of
one-loop amplitudes with respect to standard quantum field theoretical methods.


title: Exact Controllability for Stochastic Schrodinger Equations

abstract:
  This paper is addressed to studying the exact controllability for stochastic
Schr\"{o}dinger equations by two controls. One is a boundary control in the
drift term and the other is an internal control in the diffusion term. By means
of the standard duality argument, the control problem is converted into an
observability problem for backward stochastic Schr\"{o}dinger equations, and
the desired observability estimate is obtained by a global Carleman estimate.
At last, we give a result about the lack of exact controllability, which shows
that the action of two controls is necessary.


title:
Interplay between symmetry and spin-orbit coupling in graphene
  nanoribbons

abstract:
  We study the electronic structure of chiral and achiral graphene nanoribbons
with symmetric edges, including curvature and spin-orbit effects. Curved
ribbons show spin-split bands, whereas flat ribbons present spin-degenerate
bands. We show that this effect is due to the breaking of spatial inversion
symmetry in curved graphene nanoribbons, while flat ribbons with symmetric
edges possess an inversion center, regardless of their having chiral or achiral
edges. We find an enhanced edge-edge coupling and a substantial gap in narrow
chiral nanoribbons, which is not present in zigzag ribbons of similar width. We
attribute these size effects to the mixing of the sublattices imposed by the
edge geometry, yielding a distinct behavior of chiral ribbons from those with
pure zigzag edges.


title: Stochastic thermodynamics of active Brownian particles

abstract:
  Examples of self propulsion in strongly fluctuating environment is abound in
nature, e.g., molecular motors and pumps operating in living cells. Starting
from Langevin equation of motion, we develop a fluctuating thermodynamic
description of self propelled particles using simple models of velocity
dependent forces. We derive fluctuation theorems for entropy production and a
modified fluctuation dissipation relation, characterizing the linear response
at non-equilibrium steady states. We study these notions in a simple model of
molecular motors, and in the Rayleigh-Helmholtz and energy-depot model of self
propelled particles.


title: A top condensate model with a Higgs doublet and a Higgs triplet

abstract:
  We reconsider top condensate models from the perspective that not only two
quark composite fields can form but also four quark ones. We obtain a model
which contains a Higgs doublet and a Higgs triplet, where one of the neutral
components of the Higgs triplet identifies with the Higgs boson found at the
LHC. We discuss some of the phenomenological consequences.


title: Pulmonary Vascular Tree Segmentation from Contrast-Enhanced CT Images

abstract:
  We present a pulmonary vessel segmentation algorithm, which is fast, fully
automatic and robust. It uses a coarse segmentation of the airway tree and a
left and right lung labeled volume to restrict a vessel enhancement filter,
based on an offset medialness function, to the lungs. We show the application
of our algorithm on contrast-enhanced CT images, where we derive a clinical
parameter to detect pulmonary hypertension (PH) in patients. Results on a
dataset of 24 patients show that quantitative indices derived from the
segmentation are applicable to distinguish patients with and without PH.
Further work-in-progress results are shown on the VESSEL12 challenge dataset,
which is composed of non-contrast-enhanced scans, where we range in the
midfield of participating contestants.


title:
Nonlinear perturbations of a $p(x)$-Laplacian equation with critical
  growth in $\mathbb{R}^N$

abstract:
  We prove the existence of solution for a class of $p(x)$-Laplacian equations
where the nonlinearity has a critical growth. Here, we consider two cases: the
first case involves the situation where the variable exponents are periodic
functions. The second one involves the case where the variable exponents are
nonperiodic perturbations.


title:
Existence of solutions for a class of $p(x)$-laplacian equations
  involving a concave-convex nonlinearity with critical growth in
  $\mathbb{R}^{N}$

abstract:
  We prove the existence of solutions for a class of quasilinear problems
involving variable exponents and with nonlinearity having critical growth. The
main tool used is the variational method, more precisely, Ekeland's Variational
Principle and the Mountain Pass Theorem.


title:
The size of the nodal sets for the eigenfunctions of the smooth
  laplacian

abstract:
  We prove estimates for eigenfunctions on a manifold equipped with a smooth
metric. We use these estimates in order estimate the size of their nodal sets.


title:
The Luminosity function of Narrow-Line Seyfert galaxies based on SDSS
  DR7 data

abstract:
  We present measurements of AGN type 1 luminosity function in the forbidden
line [OIII]5007\AA using data from SDSS DR7. A special attention is paid to
NLSy1. A new approach in calculating the luminosity function is present. We
also account for the large-scale structure variations of the Universe density.
The results obtained are compared with ones from the literature. A prediction
of X-ray luminosity function based on our results shows an agreement with
observations. One of our preliminary conclusions is that NLSy1 seems to occupy
a more narrow range in the nuclear luminosity than BLSy1, but the average
values are within errors.


title: On unbounded invariant measures of stochastic dynamical systems

abstract:
  We consider stochastic dynamical systems on ${\mathbb{R}}$, that is, random
processes defined by $X_n^x=\Psi_n(X_{n-1}^x)$, $X_0^x=x$, where $\Psi _n$ are
i.i.d. random continuous transformations of some unbounded closed subset of
${\mathbb{R}}$. We assume here that $\Psi_n$ behaves asymptotically like
$A_nx$, for some random positive number $A_n$ [the main example is the affine
stochastic recursion $\Psi_n(x)=A_nx+B_n$]. Our aim is to describe invariant
Radon measures of the process $X_n^x$ in the critical case, when
${\mathbb{E}}\log A_1=0$. We prove that those measures behave at infinity like
$\frac{dx}{x}$. We study also the problem of uniqueness of the invariant
measure. We improve previous results known for the affine recursions and
generalize them to a larger class of stochastic dynamical systems which
include, for instance, reflected random walks, stochastic dynamical systems on
the unit interval $[0,1]$, additive Markov processes and a variant of the
Galton--Watson process.


title:
Partial order in Potts models on the generalized decorated square
  lattice

abstract:
  We explore the Potts model on the generalized decorated square lattice, with
both nearest (J1) and next-neighbor (J2) interactions. Using the tensor
renormalization-group method augmented by higher-order singular value
decompositions, we calculate the spontaneous magnetization of the Potts model
with q = 2, 3, and 4. The results for q = 2 allow us to benchmark our numerics
using the exact solution. For q = 3, we find a highly degenerate ground state
with partial order on a single sublattice, but with vanishing entropy per site,
and we obtain the phase diagram as a function of the ratio J2=J1. There is no
finite-temperature transition for the q = 4 case when J1 = J2, but the magnetic
susceptibility diverges as the temperature goes to zero, showing that the model
is critical at T = 0.


title: Mixed Mimetic Spectral Element method applied to Darcy's problem

abstract:
  We present a discretization for Darcy's problem using the recently developed
Mimetic Spectral Element Method. The gist lies in the exact discrete
representation of integral relations. In this paper, an anisotropic flow
through a porous medium is considered and a discretization of a full
permeability tensor is presented. The performance of the method is evaluated on
standard test problems, converging at the same rate as the best possible
approximation.


title:
Superconducting and Normal State Properties of APd2As2 (A = Ca, Sr, Ba)
  Single Crystals

abstract:
  The synthesis and crystallography, magnetic susceptibility chi, magnetization
M, specific heat Cp, in-plane electrical resistivity rho and in-plane magnetic
penetration depth measurements are reported for single crystals of APd2As2 (A =
Ca, Sr, Ba) versus temperature T and magnetic field H. The crystals were grown
using PdAs self-flux. CaPd2As2 and SrPd2As2 crystallize in a collapsed
body-centered tetragonal ThCr2Si2-type structure (I4/mmm), whereas BaPd2As2
crystallizes in the primitive tetragonal CeMg2Si2-type structure (P4/mmm), in
agreement with literature data. The rho(T) data exhibit metallic behavior for
all three compounds. Bulk superconductivity is reported for CaPd2As2 and
SrPd2As2 below Tc = 1.27 and 0.92 K, respectively, whereas only a trace of
superconductivity is found in BaPd2As2. No other phase transitions were
observed. The chi(T) and M(H) data reveal anisotropic diamagnetism in the
normal state, with chi_c > chi_ab for CaPd2As2 and BaPd2As2, and chi_c < chi_ab
for SrPd2As2. The normal and superconducting state data indicate that CaPd2As2
and SrPd2As2 are conventional type-II nodeless s-wave electron-phonon
superconductors. The electronic superconducting-state heat capacity data for
CaPd2As2, which has an extremely sharp heat capacity jump at Tc, are analyzed
using our recent elaboration of the alpha-model of the BCS theory of
superconductivity, which indicates that the s-wave gap in this compound is
anisotropic in momentum space.


title:
Study of $\Sigma^+\pi^-$ Invariant Mass spectrum with the KLOE detector;
  preliminary results and possible hints for $\Sigma^+n$ internal conversion

abstract:
  The AMADEUS collaboration has the goal to perform unprecedented measurements
in the field of the low-energy charged kaons-nuclei interactions, by
implementing the existing KLOE detector with a dedicated setup in the inner
region. As a preliminary step towards the realization, the AMADEUS team has
analyzed the existent 2002-2005 KLOE data, studying the processes resulting
from the negative kaons nuclear absorption in the entrance wall of the KLOE
Drift Chamber (containing mostly carbon) and in the gas filling it, mostly
helium. Processes containing Lambda-p and Lambda-d in the final state were
looked for, together with the search for the Lambda(1405) going in both the
neutral and the charged Sigma-pi channels. These analyses produced unique
results, proving the possibility to obtain, for the first time, invariant mass
spectra of the Lambda(1405) for all the possible decay channels. This was
possible thanks to the unique features of the KLOE detector, including the
excellent photon detection of its calorimeter. In addition to these results,
other interesting effects like the Sigma->Lambda internal conversion could be
investigated. Preliminary results on the Sigma+pi- decay channel and on the
Sigma->Lambda internal conversion will be presented.


title: Quark scattering off quarks and hadrons

abstract:
  The in-medium elastic scattering $qq\to qq, q\bar{q}\to q\bar{q}$ and
$\bar{q}\bar{q}\to \bar{q}\bar{q}$ is calculated within the two-flavor
Polyakov-loop-extended Nambu-Jona-Lasinio model. The integral and differential
quark-quark scattering, its energy and temperature dependence are considered
and their flavor dependence is emphasized. The comparison with results of other
approaches is presented. The consideration is implemented to the case of
quark-pion scattering characterizing the interaction between quarks and hadrons
in a kinetic multiphase treatment, and the first estimate of the quark-pion
cross sections is given. A possible application of the obtained results to
heavy ion collisions is shortly discussed.


title:
Twenty-Five Shades of Greycite: Semantics for referencing and
  preservation

abstract:
  Semantic publishing can enable richer documents with clearer, computationally
interpretable properties. For this vision to become reality, however, authors
must benefit from this process, so that they are incentivised to add these
semantics. Moreover, the publication process that generates final content must
allow and enable this semantic content. Here we focus on author-led or "grey"
literature, which uses a convenient and simple publication pipeline. We
describe how we have used metadata in articles to enable richer referencing of
these articles and how we have customised the addition of these semantics to
articles. Finally, we describe how we use the same semantics to aid in digital
preservation and non-repudiability of research articles.


title: Steenrod Structures on Categorified Quantum Groups

abstract:
  Categorified quantum groups play an increasing role in quantum topology and
representation theory. The Steenrod algebra is a fundamental component of
algebraic topology. In this paper we show that categorified quantum groups can
be extended to module categories over the Steenrod algebra in a natural way.
This yields an intepretation of the small quantum group by Khovanov and Qi.


title: A Convex Approach for Image Hallucination

abstract:
  In this paper we propose a global convex approach for image hallucination.
Altering the idea of classical multi image super resolution (SU) systems to
single image SU, we incorporate aligned images to hallucinate the output. Our
work is based on the paper of Tappen et al. where they use a non-convex model
for image hallucination. In comparison we formulate a convex primal
optimization problem and derive a fast converging primal-dual algorithm with a
global optimal solution. We use a database with face images to incorporate
high-frequency details to the high-resolution output. We show that we can
achieve state-of-the-art results by using a convex approach.


title: Parton-hadron matter in- and out-off equilibrium

abstract:
  We study the shear and bulk viscosities of partonic and hadronic matter - as
well as the electric conductivity - as functions of temperature $T$ within the
Parton-Hadron-String Dynamics (PHSD) off-shell transport approach. Dynamical
hadronic and partonic systems in equilibrium are studied by the PHSD
simulations in a finite box with periodic boundary conditions. The ratio of the
shear viscosity to entropy density $\eta(T)/s(T)$ from PHSD shows a minimum
(with a value of about 0.1) close to the critical temperature $T_c$. For
$T<T_c$, i.e. in the hadronic phase, the ratio $\eta/s$ rises fast with
decreasing temperature due to a lower interaction rate of the hadronic system
and a significantly smaller number of degrees-of-freedom. The bulk viscosity
$\zeta(T)$ -- evaluated in the relaxation time approach -- is found to strongly
depend on the effects of mean fields (or potentials) in the partonic phase. We
find a significant rise of the ratio $\zeta(T)/s(T)$ in the vicinity of the
critical temperature $T_c$, when consistently including the scalar mean-field
from PHSD, which is also in agreement with that from lQCD calculations.
Furthermore, we present the results for the ratio $(\eta+3\zeta/4)/s$, which is
found to depend non-trivially on temperature and to generally agree with the
lQCD calculations as well. Within the PHSD calculations, the strong maximum of
$\zeta(T)/\eta(T)$ close to $T_c$ has to be attributed to mean-fields (or
potential) effects that in PHSD are encoded in the temperature dependence of
the quasiparticle masses, which is related to the infrared enhancement of the
resummed (effective) coupling $g(T)$. We also find that the dimensionless ratio
of the electric conductivity over temperature $\sigma_0/T$ rises above $T_c$
approximately linearly with $T$ up to $T=2.5 T_c$, but approaches a constant
above $5 T_c$, as expected qualitatively from perturbative QCD (pQCD).


title: 1ES 1927+654: a bare Seyfert 2

abstract:
  1ES 1927+654 is an active galactic nucleus (AGN) that appears to defy the
unification model. It exhibits a type-2 optical spectrum, but possesses little
X-ray obscuration. XMM-Newton and Suzaku observations obtained in 2011 are used
to study the X-ray properties of 1ES 1927+654. The spectral energy distribution
derived from simultaneous optical-to-X-ray data obtained with XMM-Newton shows
the AGN has a typical Eddington ratio (L/L_Edd = 0.014-0.11). The X-ray
spectrum and rapid variability are consistent with originating from a corona
surrounding a standard accretion disc. Partial covering models can describe the
x-ray data; however, the narrow Fe Ka emission line predicted from standard
photoelectric absorption is not detected. Ionized partial covering also favours
a high-velocity outflow (v ~ 0.3c), which requires the kinetic luminosity of
the wind to be >30 per cent of the bolometric luminosity of the AGN. Such
values are not unusual, but for 1ES 1927+654 it requires the wind is launched
very close to the black hole (~ 10 Rg). Blurred reflection models also work
well at describing the spectral and timing properties of 1ES 1927+654 if the
AGN is viewed nearly edge-on, implying that an inner accretion disc must be
present. The high inclination is intriguing as it suggests 1ES 1927+654 could
be orientated like a Seyfert 2, in agreement with its optical classification,
but viewed through a tenuous torus.


title:
The M_BH - sigma relation for intermediate-mass black holes in globular
  clusters

abstract:
  For galaxies hosting supermassive black holes (SMBHs), it has been observed
that the mass of the central black hole (M_BH) tightly correlates with the
effective or central velocity dispersion (sigma) of the host galaxy. The origin
of this M_BH - sigma scaling relation is assumed to lie in the merging history
of the galaxies but many open questions about its origin and the behavior in
different mass ranges still need to be addressed. The goal of this work is to
study the black-hole scaling relations for low black-hole masses, where the
regime of intermediate-mass black holes (IMBHs) in globular clusters (GCs) is
entered. We collect all existing reports of dynamical black-hole measurements
in globular clusters, providing black-hole masses or upper limits for 14
candidates. We plot the black-hole masses versus different cluster parameters
including total mass, velocity dispersion, concentration and half-mass radius.
We search for trends and test the correlations in order to quantify their
significance using a set of different statistical approaches. For correlations
showing a large significance we perform a linear fit, accounting for
uncertainties and upper limits. We find a clear correlation between the mass of
the IMBH and the velocity dispersion of the globular cluster. As expected, the
total mass of the globular cluster then also correlates with the mass of the
IMBH. While the slope of the M_BH - sigma correlation differs strongly from the
one observed for SMBHs, the other scaling relations M_BH - M_TOT, and M_BH - L
are similar to the correlations in galaxies. Significant correlations of
black-hole mass with other cluster properties were not found in the present
sample.


title: Question Answering Against Very-Large Text Collections

abstract:
  Question answering involves developing methods to extract useful information
from large collections of documents. This is done with specialised search
engines such as Answer Finder. The aim of Answer Finder is to provide an answer
to a question rather than a page listing related documents that may contain the
correct answer. So, a question such as "How tall is the Eiffel Tower" would
simply return "325m" or "1,063ft". Our task was to build on the current version
of Answer Finder by improving information retrieval, and also improving the
pre-processing involved in question series analysis.


title: Irreflexive and Hierarchical Relations as Translations

abstract:
  We consider the problem of embedding entities and relations of knowledge
bases in low-dimensional vector spaces. Unlike most existing approaches, which
are primarily efficient for modeling equivalence relations, our approach is
designed to explicitly model irreflexive relations, such as hierarchies, by
interpreting them as translations operating on the low-dimensional embeddings
of the entities. Preliminary experiments show that, despite its simplicity and
a smaller number of parameters than previous approaches, our approach achieves
state-of-the-art performance according to standard evaluation protocols on data
from WordNet and Freebase.


title:
Corfu lectures on wall-crossing, multi-centered black holes, and quiver
  invariants

abstract:
  The BPS state spectrum in four-dimensional gauge theories or string vacua
with N=2 supersymmetries is well known to depend on the values of the
parameters or moduli at spatial infinity. The BPS index is locally constant,
but discontinuous across real codimension-one walls where some of the BPS
states decay. By postulating that BPS states are bound states of more
elementary constituents carrying their own degrees of freedom and interacting
via supersymmetric quantum mechanics, we provide a physically transparent
derivation of the universal wall-crossing formula which governs the jump of the
index. The same physical picture suggests that at any point in moduli space,
the total index can be written as a sum of contributions from all possible
bound states of elementary, absolutely stable constituents with the same total
charge. For D-brane bound states described by quivers, this `Coulomb branch
formula' predicts that the cohomology of quiver moduli spaces is uniquely
determined by certain `pure-Higgs' invariants, which are the microscopic
analogues of single-centered black holes. These lectures are based on joint
work with J. Manschot and A. Sen.


title: On Balanced Coloring Games in Random Graphs

abstract:
  Consider the balanced Ramsey game, in which a player has r colors and where
in each step r random edges of an initially empty graph on n vertices are
presented. The player has to immediately assign a different color to each edge
and her goal is to avoid creating a monochromatic copy of some fixed graph F
for as long as possible. The Achlioptas game is similar, but the player only
loses when she creates a copy of F in one distinguished color. We show that
there is an infinite family of non-forests F for which the balanced Ramsey game
has a different threshold than the Achlioptas game, settling an open question
by Krivelevich et al. We also consider the natural vertex analogues of both
games and show that their thresholds coincide for all graphs F, in contrast to
our results for the edge case.


title:
Eisenstein classes, elliptic Soul\'e elements and the $\ell$-adic
  elliptic polylogarithm

abstract:
  This is a completely rewritten version of the paper formerly entitled
"Sheaves of Iwasawa modules, moment maps and the $\ell$-adic elliptic
polylogarithm". The proof of the main result is also simplified.
  In the paper we study systematically the $\ell$-adic realization of the
elliptic polylogarithm in the context of sheaves of Iwasawa modules. This leads
to a description of the elliptic polylogarithm in terms of elliptic units. As
an application we prove a precise relation between $\ell$-adic Eisenstein
classes and elliptic Soul\'e elements. This allows to give a new proof of the
formula for the residue of the $\ell$-adic Eisenstein classes at the cusps and
reproves the formula for the cup-product construction in \cite{Huber-Kings99}.
  The paper is the elaboration of lectures given at the Pune-Workshop on the
proof of the Bloch-Kato conjectures for the Riemann zeta function in 2012.


title:
The automorphism group of a self-dual [72,36,16] code is not an
  elementary abelian group of order 8

abstract:
  The existence of an extremal self-dual binary linear code C of length 72 is a
long-standing open problem. We continue the investigation of its automorphism
group: looking at the combination of the subcodes fixed by different
involutions and doing a computer calculation with Magma, we prove that Aut(C)
is not isomorphic to the elementary abelian group of order 8. Combining this
with the known results in the literature one obtains that Aut(C) has order at
most 5.


title:
Incompressibility of finite fermionic systems: stable and exotic atomic
  nuclei

abstract:
  The incompressibility of finite fermionic systems is investigated using
analytical approaches and microscopic models. The incompressibility of a system
is directly linked to the zero-point kinetic energy of constituent fermions,
and this is a universal feature of fermionic systems. In the case of atomic
nuclei, this implies a constant value of the incompressibility in medium-heavy
and heavy nuclei. The evolution of nuclear incompressibility along Sn and Pb
isotopic chains is analyzed using global microscopic models, based on both
non-relativistic and relativistic energy functionals. The result is an almost
constant incompressibility in stable nuclei and systems not far from stability,
and a steep decrease in nuclei with pronounced neutron excess, caused by the
emergence of a soft monopole mode in neutron-rich nuclei.


title: High-order rogue waves for the Hirota equation

abstract:
  The Hirota equation is better than the nonlinear Schr\"{o}dinger equation
when approximating deep ocean waves. In this paper, high-order rational
solutions for the Hirota equation are constructed based on the parameterized
Darboux transformation. Several types of this kind of solutions are classified
by their structures.


title:
Low energy kaon-nuclei interaction studies through the \Sigma^0\pi^0
  channel with the KLOE detector

abstract:
  The AMADEUS experiment aims to perform precision studies in the sector of
low-energy kaon-nuclei interaction at the DA\Phi NE collider at LNF-INFN,
implementing a dedicated setup in the central region of the KLOE detector. As a
first step towards the AMADEUS realization the existing KLOE data (runs from
2002 to 2005) were analysed using the detector itself as an active target. K^-
nuclear interactions in the gas filling the KLOE drift chamber (Helium 90% and
Isobutane 10%) and the drift chamber entrance wall (mainly Carbon) were
explored. Starting point was the reconstruction of the \Lambda(1116) trough its
decay into a proton and a pion (BR = 63.9 \pm 0.5%). Taking advantage of the
good performances of the KLOE calorimeter in detecting photons we then focused
on the investigation of the \Lambda(1405), through its decay into
\Sigma^0\pi^0. The details of the \Sigma^0 \pi^0 analysis and preliminary
results are presented.


title: Grand Unified Theories and Higgs Physics

abstract:
  The grand unified theories are theoretically well motivated, but they
typically have less direct indications on the low energy physics and it is not
easy to test them. Here, we discuss a scenario of them which naturally solves
the so-called doublet-triplet splitting problem and, at the same time,
generally predicts characteristic collider phenomenology. Then, we may get a
hint on the breaking of the grand unified symmetry at the on-going and
next-generation collider experiments.


title:
To see or not to see: Imaging surfactant coated nano--particles using
  HIM and SEM

abstract:
  Nano--particles are of great interest in fundamental and applied research.
However, their accurate visualization is often difficult and the interpretation
of the obtained images can be complicated. We present a comparative scanning
electron microscopy and helium ion microscopy study of
cetyltrimethylammonium--bromide (CTAB) coated gold nano--rods. Using both
methods we show how the gold core as well as the surrounding thin CTAB shell
can selectively be visualized. This allows for a quantitative determination of
the dimensions of the gold core or the CTAB shell. The obtained CTAB shell
thickness of 1.0 nm--1.5 nm is in excellent agreement with earlier results
using more demanding and reciprocal space techniques.


title: Non Deterministic Logic Programs

abstract:
  Non deterministic applications arise in many domains, including, stochastic
optimization, multi-objectives optimization, stochastic planning, contingent
stochastic planning, reinforcement learning, reinforcement learning in
partially observable Markov decision processes, and conditional planning. We
present a logic programming framework called non deterministic logic programs,
along with a declarative semantics and fixpoint semantics, to allow
representing and reasoning about inherently non deterministic real-world
applications. The language of non deterministic logic programs framework is
extended with non-monotonic negation, and two alternative semantics are
defined: the stable non deterministic model semantics and the well-founded non
deterministic model semantics as well as their relationship is studied. These
semantics subsume the deterministic stable model semantics and the
deterministic well-founded semantics of deterministic normal logic programs,
and they reduce to the semantics of deterministic definite logic programs
without negation. We show the application of the non deterministic logic
programs framework to a conditional planning problem.


title:
On the non-idealness of cyclotomic families of pairing-friendly elliptic
  curves

abstract:
  Let $k=2^mp^n$ for an odd prime $p$ and integers $m\ge 0$ and $n\ge 0$. We
obtain lower bounds for the $\rho$-values of cyclotomic families of
pairing-friendly elliptic curves with embedding degree $k$ and
$r(x)=\Phi_k(x)$. Our bounds imply that none of these families are ideal.