title:
Spin fluctuations and pairing symmetry in A$_{x}$Fe$_{2-y}$Se$_{2}$:
  dual effect of the itinerant and the localized nature of electrons

abstract:
  We investigate the spin fluctuations and the pairing symmetry in
A$_{x}$Fe$_{2-y}$Se$_{2}$ by the fluctuation exchange approximation. Besides
the on-site interactions, the next-nearest-neighbor antiferromagnetic coupling
$J_{2}$ is also included. We find that both the itinerant and the localized
natures of electrons are important to describe the recent experimental results
of the spin fluctuations and the pairing symmetry. In particular, a small
$J_{2}$ coupling can change the pairing gap from the d-wave symmetry to the
s-wave symmetry. We have also studied the real-space structures of the gap
functions for different orbits in order to gain more insight on the nature of
the pairing mechanism.


title: Further improvements on the Feng-Rao bound for dual codes

abstract:
  Salazar, Dunn and Graham in [Salazar et. al., 2006] presented an improved
Feng-Rao bound for the minimum distance of dual codes. In this work we take the
improvement a step further. Both the original bound by Salazar et. al., as well
as our improvement are lifted so that they deal with generalized Hamming
weights. We also demonstrate the advantage of working with one-way
well-behaving pairs rather than weakly well-behaving or well-behaving pairs.


title:
Electrical resistance of the low dimensional critical branching random
  walk

abstract:
  We show that the electrical resistance between the origin and generation n of
the incipient infinite oriented branching random walk in dimensions d<6 is
O(n^{1-alpha}) for some universal constant alpha>0. This answers a question of
Barlow, J\'arai, Kumagai and Slade [2].


title:
Computational methods for the dynamics of the nonlinear
  Schrodinger/Gross-Pitaevskii equations

abstract:
  In this paper, we begin with the nonlinear Schrodinger/Gross-Pitaevskii
equation (NLSE/GPE) for modeling Bose-Einstein condensation (BEC) and nonlinear
optics as well as other applications, and discuss their dynamical properties
ranging from time reversible, time transverse invariant, mass and energy
conservation, dispersion relation to soliton solutions. Then, we review and
compare different numerical methods for solving the NLSE/GPE including finite
difference time domain methods and time-splitting spectral method, and discuss
different absorbing boundary conditions. In addition, these numerical methods
are extended to the NLSE/GPE with damping terms and/or an angular momentum
rotation term as well as coupled NLSEs/GPEs. Finally, applications to simulate
a quantized vortex lattice dynamics in a rotating BEC are reported.


title:
Electromagnetic transition from the 4$^+$ to 2$^+$ resonance in $^8$Be
  measured via the radiative capture in $^4$He+$^4$He

abstract:
  An earlier measurement on the 4$^+$ to 2$^+$ radiative transition in $^8$Be
provided the first electromagnetic signature of its dumbbell-like shape.
However, the large uncertainty in the measured cross section does not allow a
stringent test of nuclear structure models. The present paper reports a more
elaborate and precise measurement for this transition, via the radiative
capture in the $^4$He+$^4$He reaction, improving the accuracy by about a factor
of three. The {\it ab initio} calculations of the radiative transition strength
with improved three-nucleon forces are also presented. The experimental results
are compared with the predictions of the alpha cluster model and {\it ab
initio} calculations.


title:
Time-dependent loss of derivatives for hyperbolic operators with non
  regular coefficients

abstract:
  In this paper we will study the Cauchy problem for strictly hyperbolic
operators with low regularity coefficients in any space dimension $N\geq1$. We
will suppose the coefficients to be log-Zygmund continuous in time and
log-Lipschitz continuous in space. Paradifferential calculus with parameters
will be the main tool to get energy estimates in Sobolev spaces and these
estimates will present a time-dependent loss of derivatives.


title: Is Mg II 2800 a Reliable Virial Broadening Estimator for Quasars?

abstract:
  [Abridged] Broad MgII 2800 and Hbeta lines have emerged as the most reliable
virial estimators of black hole mass in quasars. Which is more reliable?
Comparison of MgII 2800 and Hbeta profile measures in the same sources and
especially FWHM measures that provide the virial broadening estimator.
Identification of 680 bright Sloan Digital Sky Survey DataRelease 7 quasars
with spectra showing both MgII 2800 and Hbeta lines, at redshift 0.4 < z <
0.75. The s/n of these spectra are high enough to allow binning in the
"four-dimensional (4D) eigenvector 1'' optical plane and construction of high
s/n composite spectra. We confirm that MgII 2800 shows a profile that is ~ 20%
narrower as suggested in some previous studies. FWHM measures for Population B
sources (i.e., with FWHM of Hbeta larger than 4000 km/s) are uncertain because
they show complex profiles with at least two broad-line components involving a
nearly unshifted broad and redshifted very-broad component. Only the broad
component is likely to be a valid virial estimator. If Hbeta and MgII 2800 are
not corrected for the very broad component then black hole mass values for
Population B sources will be systematically overestimated by up to logM ~
0.3-0.4 dex. We suggest a simple correction that can be applied to the majority
of sources. MgII 2800 is the safer virial estimator for Population B sources
because the centroid shifts with respect to rest frame are lower than for
Hbeta. In the broad and very broad component profile interpretation this is a
consequence of the lower very broad to broad component intensity ratio for MgII
2800. Effective discrimination of black hole mass and Eddington ratio at fixed
redshift is not achieved via luminosity binning but rather by binning in a "4D
eigenvector 1'' context that reflects different broad line region
geometry/kinematics likely driven by Eddington ratio.


title:
Dissipative Effects on the Superfluid to Insulator Transition in
  Mixed-dimensional Optical Lattices

abstract:
  We study the superfluid to Mott insulator transition of a mixture of heavy
bosons and light fermions loaded in an optical lattice. We focus on the effect
of the light fermions on the dynamics of the heavy bosons. It is shown that,
when the lattice potential is sufficiently deep to confine the bosons to one
dimension but allowing the fermions to freely move in three dimensions (i.e. a
mixed-dimensionality lattice), the fermions act as an ohmic bath for bosons
leading to screening and dissipation effects on the bosons. Using a
perturbative renormalization-group analysis, it is shown that the
fermion-induced dissipative effects have no appreciable impact on the
transition from the superfluid to the Mott-insulator state at integer filling.
On the other hand, dissipative effects are found to be very important in the
half-filled case near the critical point. In this case, in the presence of a
finite incommensurability that destabilizes the Mott phase, the bosons can
still be localized by virtue of dissipative effects.


title:
Generalized frieze pattern determinants and higher angulations of
  polygons

abstract:
  Frieze patterns (in the sense of Conway and Coxeter) are in close connection
to triangulations of polygons. Broline, Crowe and Isaacs have assigned a
symmetric matrix to each polygon triangulation and computed the determinant. In
this paper we consider d-angulations of polygons and generalize the
combinatorial algorithm for computing the entries in the associated symmetric
matrices; we compute their determinants and the Smith normal forms. It turns
out that both are independent of the particular d-angulation, the determinant
is a power of d-1, and the elementary divisors only take values d-1 and 1. We
also show that in the generalized frieze patterns obtained in our setting every
adjacent 2x2-determinant is 0 or 1, and we give a combinatorial criterion for
when they are 1, which in the case d=3 gives back the Conway-Coxeter condition
on frieze patterns.


title: Detection of Coma Activity of the ACO/Quasi-Hilda Object, 212P/2000YN30

abstract:
  The quasi-Hilda object, 212P/2000YN30 with a cometary-like orbit, was found
to display a dust tail structure between January and March, 2009. From orbital
calculations, it is shown that this object could have been an active comet in
its past history before being transported to the current orbital configuration
in quasi-stable 3:2 resonance with Jupiter.


title: Inverse magnetic catalysis induced by sphalerons

abstract:
  The recently discovered inverse magnetic catalysis around the critical
temperature indicates that some important information is missing in our current
understanding of conventional chiral dynamics of QCD, which is enhanced by the
magnetic field. In this work, we provide a mechanism to explain that the
inverse magnetic catalysis around the critical temperature is induced by
sphalerons. At high temperatures, sphaleron transitions between distinct
classical vacua cause an asymmetry between the number of right- and left-handed
quarks due to the axial anomaly of QCD. In the presence of a strong magnetic
field, the chiral imbalance is enhanced and destroys the right- and left-handed
pairings, which naturally induces a decreasing critical temperature of the
chiral phase transition for increasing magnetic field. The inverse magnetic
catalysis at finite baryon density, and the critical end point in the presence
of a strong magnetic field is also explored in this work.


title:
Generating polarization controllable FELs at Dalian coherent light
  source

abstract:
  The property of the FEL polarization is of great importance to the user
community. FEL pulses with ultra-high intensity and flexible polarization
control ability will absolutely open up new scientific realms. In this paper,
several polarization control approaches are presented to investigate the great
potential on Dalian coherent light source, which is a government-approved novel
FEL user facility with the capability of wavelength continuously tunable in the
EUV regime of 50-150 nm. The numerical simulations show that both circularly
polarized FELs with highly modulating frequency and 100 microjoule level pulse
energy could be generated at Dalian coherent light source.


title:
Incremental Sampling-based Algorithm for Minimum-violation Motion
  Planning

abstract:
  This paper studies the problem of control strategy synthesis for dynamical
systems with differential constraints to fulfill a given reachability goal
while satisfying a set of safety rules. Particular attention is devoted to
goals that become feasible only if a subset of the safety rules are violated.
The proposed algorithm computes a control law, that minimizes the level of
unsafety while the desired goal is guaranteed to be reached. This problem is
motivated by an autonomous car navigating an urban environment while following
rules of the road such as "always travel in right lane'' and "do not change
lanes frequently''. Ideas behind sampling based motion-planning algorithms,
such as Probabilistic Road Maps (PRMs) and Rapidly-exploring Random Trees
(RRTs), are employed to incrementally construct a finite concretization of the
dynamics as a durational Kripke structure. In conjunction with this, a weighted
finite automaton that captures the safety rules is used in order to find an
optimal trajectory that minimizes the violation of safety rules. We prove that
the proposed algorithm guarantees asymptotic optimality, i.e., almost-sure
convergence to optimal solutions. We present results of simulation experiments
and an implementation on an autonomous urban mobility-on-demand system.


title: Dijkgraaf-Vafa conjecture and beta-deformed matrix models

abstract:
  We study the beta-deformed matrix models using the method of refined
topological string theory. The refined holomorphic anomaly equation and
boundary conditions near the singular divisors of the underlying geometry fix
the refined amplitudes recursively. We provide exact test of the quantum
integrality conjecture in the Nekrasov-Shatashvili limit. We check the higher
genus exact formulae with perturbative matrix model calculations.


title:
Every flat surface is Birkhoff and Oseledets generic in almost every
  direction

abstract:
  We prove that the Birkhoff pointwise ergodic theorem and the Oseledets
multiplicative ergodic theorem hold for every flat surface in almost every
direction. The proofs rely on the strong law of large numbers, and on recent
rigidity results for the action of the upper triangular subgroup of SL(2,R) on
the moduli space of flat surfaces. Most of the results also use a theorem about
continuity of splittings of the Kontsevich-Zorich cocycle recently proved by S.
Filip.


title:
Integral field spectroscopy of supernova explosion sites: constraining
  mass and metallicity of the progenitors - I. Type Ib and Ic supernovae

abstract:
  Integral field spectroscopy of 11 type-Ib/c supernova explosion sites in
nearby galaxies has been obtained using UH88/SNIFS and Gemini-N/GMOS. The use
of integral field spectroscopy enables us to obtain both spatial and spectral
information of the explosion site, allowing the identification of the parent
stellar population of the supernova progenitor star. The spectrum of the parent
population provides metallicity determination via strong-line method and age
estimation obtained via comparison with simple stellar population (SSP) models.
We adopt this information as the metallicity and age of the supernova
progenitor, under the assumption that it was coeval with the parent stellar
population. The age of the star corresponds to its lifetime, which in turn
gives the estimate of its initial mass. With this method we were able to
determine both the metallicity and initial (ZAMS) mass of the progenitor stars
of the type Ib and Ic supernovae. We found that on average SN Ic explosion
sites are more metal-rich and younger than SN Ib sites. The initial mass of the
progenitors derived from parent stellar population age suggests that SN Ic have
more massive progenitors than SN Ib. In addition, we also found indication that
some of our SN progenitors are less massive than ~25 Msun, indicating that they
may have been stars in a close binary system that have lost their outer
envelope via binary interactions to produce Ib/c supernovae, instead of single
Wolf-Rayet stars. These findings support the current suggestions that both
binary and single progenitor channels are in effect in producing type Ib/c
supernovae. This work also demonstrates the power of integral field
spectroscopy in investigating supernova environments and active star forming
regions.


title: Discretized Tikhonov regularization for Robin boundaries localization

abstract:
  We deal with a boundary detection problem arising in nondestructive testing
of materials. The problem consists in recovering an unknown portion of the
boundary, where a Robin condition is satisfied, with the use of a Cauchy data
pair collected on the accessible part of the boundary. We combine a
linearization argument with a Tikhonov regularization approach for the local
reconstruction of the unknown defect. Moreover, we discuss the regularization
parameter choice by means of the so called balancing principle and we present
some numerical tests that show the efficiency of our method.


title:
Towards single-cycle squeezing in chirped quasi-phase-matched optical
  parametric down-conversion

abstract:
  We propose a method for generation of a single-cycle squeezed light by
parametric down-conversion in a chirped quasi-phase-matched nonlinear crystal.
We find an exact quantum solution for this process valid for an arbitrary
parametric gain, and discover an ultrabroadband squeezing in the down-converted
light with flat squeezing spectrum comprising the full optical octave. We
describe a scheme for observation of this kind of squeezing using
second-harmonic generation as an ultrafast correlator.


title: Dark Matter and Vector-like Leptons From Gauged Lepton Number

abstract:
  We investigate a simple model where Lepton number is promoted to a local
$U(1)_L$ gauge symmetry which is then spontaneously broken, leading to a viable
thermal DM candidate and vector-like leptons as a byproduct. The dark matter
arises as part of the exotic lepton sector required by the need to satisfy
anomaly cancellation and is a Dirac electroweak (mostly) singlet neutrino. It
is stabilized by an accidental global symmetry of the renormalizable Lagrangian
which is preserved even after the gauged lepton number is spontaneously broken
and can annihilate efficiently to give the correct thermal relic abundance. We
examine the ability of this model to give a viable DM candidate and discuss
both direct and indirect detection implications. We also examine some of the
LHC phenomenology of the associated exotic lepton sector and in particular its
effects on Higgs decays.


title: The Aubry-Mather theorem for driven generalized elastic chains

abstract:
  We consider uniformly (DC) or periodically (AC) driven generalized infinite
elastic chains (a generalized Frenkel-Kontorova model) with gradient dynamics.
We first show that the union of supports of all the invariant measures, denoted
by A, projects injectively to a dynamical system on a 2-dimensional cylinder.
We also prove existence of ergodic invariant measures supported on a set of
rotationaly ordered configurations with an arbitrary (rational or irrational)
rotation number. This shows that the Aubry-Mather structure of ground states
persists if an arbitrary AC or DC force is applied. The set A attracts almost
surely (in probability) configurations with bounded spacing. In the DC case,
the set A consists entirely of equilibria and uniformly sliding solutions. The
key tool is a new weak Lyapunov function on the space of translationally
invariant probability measures on the state space, which counts intersections.


title:
Dissipative dynamics of atom-field entanglement in the
  ultrastrong-coupling regime

abstract:
  The dynamics of atom-field entanglement for a system composed of two atoms
resonantly coupled to a single mode leaky cavity field has been investigated
beyond rotating wave approximation (RWA). By using monogamic relation for
entanglement of formation (EOF) as well as the lower bound of EOF for bipartite
mixed states in higher dimensions, contrary to the RWA case, the atom-field
system in the steady states is found to be entangled in the strong-coupling
regime and the entanglement can grow as a function of atom-field coupling
strength.


title:
About integrability of almost complex structures on strictly Nearly
  K\"{a}hler 6-manifolds

abstract:
  We show that any almost complex structure, positively tamed with $\omega$ on
nearly K\"{a}hler 6-manifold $(M,g,J,\omega)$ is not integrable


title: json2run: a tool for experiment design & analysis

abstract:
  json2run is a tool to automate the running, storage and analysis of
experiments. The main advantage of json2run is that it allows to describe a set
of experiments concisely as a JSON-formatted parameter tree. It also supports
parallel execution of experiments, automatic parameter tuning through the
F-Race framework and storage and analysis of experiments with MongoDB and R.


title: Boundary quantum Knizhnik-Zamolodchikov equations and Bethe vectors

abstract:
  Solutions to boundary quantum Knizhnik-Zamolodchikov equations are
constructed as bilateral sums involving "off-shell" Bethe vectors in case the
reflection matrix is diagonal and only the 2-dimensional representation of
$U_q(\hat{\frak{sl}(2)})$ is involved. We also consider their rational and
classical degenerations.


title: Towards User Profile Modelling in Recommender System

abstract:
  The notion of profile appeared in the 1970s decade, which was mainly due to
the need to create custom applications that could be adapted to the user. In
this paper, we treat the different aspects of the user's profile, defining it,
profile, its features and its indicators of interest, and then we describe the
different approaches of modelling and acquiring the user's interests.


title: Approximate Hagemann-Mitschke co-operations

abstract:
  We show that varietal techniques based on the existence of operations of a
certain arity can be extended to n-permutable categories with binary
coproducts. This is achieved via what we call approximate Hagemann-Mitschke
co-operations, a generalisation of the notion of approximate Mal'tsev
co-operation. In particular, we extend characterisation theorems for
n-permutable varieties due to J. Hagemann and A. Mitschke to regular categories
with binary coproducts.


title:
Gate voltage tuned quantum superconductor to insulator transition in an
  ultrathin bismuth film revisited

abstract:
  We explore the implications of Berezinskii-Kosterlitz-Thouless (BKT) critical
behavior and variable-range hopping on the two dimensional (2D) quantum
superconductor-insulator (QSI) transition driven by tuning the gate voltage. To
illustrate the potential and the implications of this scenario we analyze sheet
resistance data of Parendo et al. taken on a gate voltage tuned ultrathin
amorphous bismuth film. The finite size scaling analysis of the BKT-transition
uncovers a limiting length preventing the correlation length to diverge and to
enter the critical regime deeply. Nevertheless the attained BKT critical regime
reveals consistency with two parameter quantum scaling and an explicit quantum
scaling function determined by the BKT correlation length. The two parameter
scaling yields for the zero temperature critical exponents of the
QSI-transition the estimates zn = 3/2, z = 3, and n = 1/2, revealing that
hyperscaling is violated and in contrast to finite temperature disorder is
relevant at zero temperature. Furthermore, zn = 3/2 is also consistent with the
two variable quantum scaling form associated with a variable-range hopping
controlled insulating ground state.


title: The $T$-equivariant integral cohomology ring of $F_4/T$

abstract:
  We determine the $T$-equivariant integral cohomology of $F_4/T$
combinatorially by the GKM theory, where T is a maximal torus of the
exceptional Lie group $F_4$ and acts on $F_4/T$ by the left multiplication.


title: Statistical tests for group comparison of manifold-valued data

abstract:
  Motivated by population studies of Diffusion Tensor Imaging, the paper
investigates the use of mean-based and dispersion-based permutation tests to
define and compute the significance of a statistical test for data taking
values on nonlinear manifolds. The paper proposes statistical tests that are
computationally tractable and geometrically sound for Diffusion Tensor Imaging.


title:
Far-Infrared Spectroscopy of the Galactic Center. Hot Molecular Gas:
  Shocks versus Radiation near SgrA*

abstract:
  We present a 52-671um spectral scan toward SgrA* taken with the PACS and
SPIRE spectrometers onboard Herschel. The achieved angular resolution allows us
to separate, for the first time at far-IR wavelengths, the emission toward the
central cavity (gas in the inner central parsec of the galaxy) from that of the
surrounding circum-nuclear disk. The spectrum toward SgrA* is dominated by
strong [OIII], [OI], [CII], [NIII], [NII], and [CI] fine structure lines (in
decreasing order of luminosity) arising in gas irradiated by UV-photons from
the central stellar cluster. In addition, rotationally excited lines of 12CO
(from J=4-3 to 24-23), 13CO, H2O, OH, H3O+, HCO+ and HCN, as well as
ground-state absorption lines of OH+, H2O+, H3O+, CH+, H2O, OH, HF, CH and NH
are detected. The excitation of the 12CO ladder is consistent with a hot
isothermal component at Tk ~ 10^{3.1} K and n(H2)< 10^4 cm^{-3}. It is also
consistent with a distribution of temperature components at higher density with
most CO at Tk<300 K. The detected molecular features suggest that, at present,
neither very enhanced X-ray, nor cosmic-ray fluxes play a dominant role in the
heating of the hot molecular gas. The hot CO component (either the bulk of the
CO column or just a small fraction depending on the above scenario) results
from a combination of UV- and shock-driven heating. If irradiated dense
clumps/clouds do not exist, shocks likely dominate the heating of the hot
molecular gas. This is consistent with the high-velocity gas detected toward
SgrA*.


title: The predictability of consumer visitation patterns

abstract:
  We consider hundreds of thousands of individual economic transactions to ask:
how predictable are consumers in their merchant visitation patterns? Our
results suggest that, in the long-run, much of our seemingly elective activity
is actually highly predictable. Notwithstanding a wide range of individual
preferences, shoppers share regularities in how they visit merchant locations
over time. Yet while aggregate behavior is largely predictable, the
interleaving of shopping events introduces important stochastic elements at
short time scales. These short- and long-scale patterns suggest a theoretical
upper bound on predictability, and describe the accuracy of a Markov model in
predicting a person's next location. We incorporate population-level transition
probabilities in the predictive models, and find that in many cases these
improve accuracy. While our results point to the elusiveness of precise
predictions about where a person will go next, they suggest the existence, at
large time-scales, of regularities across the population.


title: Storage and Search in Dynamic Peer-to-Peer Networks

abstract:
  We study robust and efficient distributed algorithms for searching, storing,
and maintaining data in dynamic Peer-to-Peer (P2P) networks. P2P networks are
highly dynamic networks that experience heavy node churn (i.e., nodes join and
leave the network continuously over time). Our goal is to guarantee, despite
high node churn rate, that a large number of nodes in the network can store,
retrieve, and maintain a large number of data items. Our main contributions are
fast randomized distributed algorithms that guarantee the above with high
probability (whp) even under high adversarial churn:
  1. A randomized distributed search algorithm that (whp) guarantees that
searches from as many as $n - o(n)$ nodes ($n$ is the stable network size)
succeed in ${O}(\log n)$-rounds despite ${O}(n/\log^{1+\delta} n)$ churn, for
any small constant $\delta > 0$, per round. We assume that the churn is
controlled by an oblivious adversary (that has complete knowledge and control
of what nodes join and leave and at what time, but is oblivious to the random
choices made by the algorithm).
  2. A storage and maintenance algorithm that guarantees (whp) data items can
be efficiently stored (with only $\Theta(\log{n})$ copies of each data item)
and maintained in a dynamic P2P network with churn rate up to
${O}(n/\log^{1+\delta} n)$ per round. Our search algorithm together with our
storage and maintenance algorithm guarantees that as many as $n - o(n)$ nodes
can efficiently store, maintain, and search even under ${O}(n/\log^{1+\delta}
n)$ churn per round. Our algorithms require only polylogarithmic in $n$ bits to
be processed and sent (per round) by each node.
  To the best of our knowledge, our algorithms are the first-known,
fully-distributed storage and search algorithms that provably work under highly
dynamic settings (i.e., high churn rates per step).


title: Gravitational-Wave by Binary OJ287 in 3.5 PN Approximation

abstract:
  We compute the gravitational radiation of the supermassive binary black hole
OJ287. By fitting the data of its recent seven outbursts, we obtain the orbital
motion up to 3.5PN (Post-Newtonian) order, the energy and angular momentum
fluxes and the waveform up to the 2PN. It is found that the 1PN term of the
energy flux, has an opposite sign to the Newtonian flux, and the 2PN term has
an opposite sign to the 1PN one. The same pattern is also found for the angular
momentum fluxes. The total flux is reduced by 30.8% on average from the
Newtonian flux for OJ287, resulting in a smaller orbital decay rate than that
of 2.5PN calculation. Consisting with this, it is checked that, in the sequence
of non-dissipative PN forces, each term of $i^{th}$ order (dissipative or
non-dissipative) has a sign opposite to the $(i-1)^{th}$ order. The origin of
this characteristic is traced to the appearance of the non-diagonal metric
component $g_{0i}$ in PN approximation. This feature will have profound impact
on estimation of gravitational waves from binary systems.


title:
Phonon coupling effects in magnetic moments of magic and semi-magic
  nuclei

abstract:
  Phonon coupling (PC) corrections to magnetic moments of odd neighbors of
magic and semi-magic nuclei are analyzed within the self-consistent Theory of
Finite Fermi Systems (TFFS) based on the Energy Density Functional by Fayans et
al. The perturbation theory in g_L^2 is used where g_L is the phonon-particle
coupling vertex. A model is developed with separating non-regular PC
contributions, the rest is supposed to be regular and included into the
standard TFFS parameters. An ansatz is proposed to take into account the
so-called tadpole term which ensures the total angular momentum conservation
with g_L^2 accuracy. An approximate method is suggested to take into account
higher order terms in g_L^2. Calculations are carried out for four odd-proton
chains, the odd Tl, Bi, In and Sb ones. Different PC corrections strongly
cancel each other. In the result, the total PC correction to the magnetic
moment in magic nuclei is, as a rule, negligible. In non-magic nuclei
considered it is noticeable and, with only one exception, negative. On average
it is of the order of -(0.1 - 0.5) \mu_N and improves the agreement of the
theory with the data. Simultaneously we calculated the gyromagnetic ratio
g_L^{ph} of all low-lying phonons in 208Pb. For the 3^-_1 state it is rather
close to the Bohr-Mottelson model prediction whereas for other L-phonons, two
5^- and six positive parity states, the difference from the Bohr-Mottelson
values is significant.


title: Interplay between magnetism and magnetocaloric effect in NdCuSi

abstract:
  We report the magnetic, thermal, magnetocaloric and transport properties of
polycrystalline NdCuSi. The compound shows a weak antiferromagnetic ordering,
as confirmed by different measurements. Arrott plots indicate that the magnetic
phase transition is found to be second order in nature. The isothermal magnetic
entropy change calculated using the magnetization data gives a value of 11.1
J/kg K for a field change of 50 kOe. The follows h2/3 dependence (h is the
reduced field) with a negative intercept, which is predicted by mean field
theory for second order phase transitions. Landau theory of phase transition
was applied to calculate change in entropy, which was found to be in good
agreement with that calculated directly from the magnetization data.
Temperature dependence of electrical resistivity shows a pronounced anomaly at
the ordering temperature, which is attributed to the spin fluctuations.


title:
A note on the continuity of free-boundaries in finite-horizon optimal
  stopping problems for one dimensional diffusions

abstract:
  We provide sufficient conditions for the continuity of the free-boundary in a
general class of finite-horizon optimal stopping problems arising for instance
in finance and economics. The underlying process is a strong solution of one
dimensional, time-homogeneous stochastic differential equation (SDE). The proof
relies on both analytic and probabilistic arguments and it is based on a
contradiction scheme inspired by the maximum principle in partial differential
equations (PDE) theory. Mild, local regularity of the coefficients of the SDE
and smoothness of the gain function locally at the boundary are required.


title:
Gains from the upgrade of the cold neutron triple-axis spectrometer
  FLEXX at the BER-II reactor

abstract:
  The upgrade of the cold neutron triple-axis spectrometer FLEXX is described.
We discuss the characterisation of the gains from the new primary spectrometer,
including a larger guide and double focussing monochromator, and present
measurements of the energy and momentum resolution and of the neutron flux of
the instrument. We found an order of magnitude gain in intensity (at the cost
of coarser momentum resolution), and that the incoherent elastic energy widths
are measurably narrower than before the upgrade. The much improved count rate
should allow the use of smaller single crystals samples and thus enable the
upgraded FLEXX spectrometer to continue making leading edge measurements.


title:
Harmonic Bergman spaces, the Poisson equation and the dual of Hardy-type
  spaces on certain noncompact manifolds

abstract:
  In this paper we consider a complete connected noncompact Riemannian manifold
M with bounded geometry and spectral gap. We realize the dual space Y^h(M) of
the Hardy-type space X^h(M), introduced in a previous paper of the authors, as
the class of all locally square integrable functions satisfying suitable
BMO-like conditions, where the role of the constants is played by the space of
global k-quasi-harmonic functions. Furthermore we prove that Y^h(M) is also the
dual of the space X^k_fin(M) of finite linear combination of X^k-atoms. As a
consequence, if Z is a Banach space and T is a Z-valued linear operator defined
on X^k_fin(M), then T extends to a bounded operator from X^k(M) to Z if and
only if it is uniformly bounded on X^k-atoms. To obtain these results we prove
the global solvability of the generalized Poisson equation L^ku=f with f in
L^2_loc(M) and we study some properties of generalized Bergman spaces of
harmonic functions on geodesic balls.


title:
Conservation of geometric structures for non-homogeneous inviscid
  incompressible fluids

abstract:
  We obtain a result about propagation of geometric properties for solutions of
the non-homogeneous incompressible Euler system in any dimension $N\geq2$. In
particular, we investigate conservation of striated and conormal regularity,
which is a natural way of generalizing the 2-D structure of vortex patches. The
results we get are only local in time, even in the dimension N=2; however, we
provide an explicit lower bound for the lifespan of the solution. In the case
of physical dimension N=2 or 3, we investigate also propagation of H\"older
regularity in the interior of a bounded domain.


title:
The well-posedness issue for the density-dependent Euler equations in
  endpoint Besov spaces

abstract:
  This work is the continuation of the recent paper \cite{D2} devoted to the
density-dependent incompressible Euler equations. Here we concentrate on the
well-posedness issue in Besov spaces of type $B^s_{\infty,r}$ embedded in the
set of Lipschitz continuous functions, a functional framework which contains
the particular case of H\"older spaces and of the endpoint Besov space
$B^1_{\infty,1}.$ For such data and under the nonvacuum assumption, we
establish the local well-posedness and a continuation criterion in the spirit
of that of Beale, Kato and Majda in \cite{BKM}.
  In the last part of the paper, we give lower bounds for the lifespan of a
solution. In dimension two, we point out that the lifespan tends to infinity
when the initial density tends to be a constant. This is, to our knowledge, the
first result of this kind for the density-dependent incompressible Euler
equations.


title: Universal gates for transforming multipartite entangled Dicke states

abstract:
  We determine the minimal number of qubits that it is necessary to have access
to in order to transform Dicke states into other Dicke states. In general, the
number of qubits in Dicke states cannot be increased via transformation gates
by accessing only a single qubit, in direct contrast to other multipartite
entangled states such as GHZ, W and cluster states. We construct a universal
optimal gate which adds spin-up qubits or spin-down qubits to any Dicke state
by minimal access. We also show the existence of a universal gate which
transforms any size of Dicke state as long as it has access to at least the
required number of qubits. Our results have important consequences for the
generation of Dicke states in physical systems such as ion traps, all-optical
setups and cavity-QED settings where they can be used for a variety of quantum
information processing tasks.


title:
The well-posedness issue in endpoint spaces for an inviscid low-Mach
  number limit system

abstract:
  The present paper is devoted to the well-posedness issue for a low-Mach
number limit system with heat conduction but no viscosity. We will work in the
framework of general Besov spaces $B^s_{p,r}(\R^d)$, $d\geq 2$, which can be
embedded into the class of Lipschitz functions.
  Firstly, we consider the case of $p\in[2,4]$, with no further restrictions on
the initial data. Then we tackle the case of any $p\in\,]1,\infty]$, but
requiring also a finite energy assumption. The extreme value $p=\infty$ can be
treated due to a new a priori estimate for parabolic equations. At last we also
briefly consider the case of any $p\in ]1,\infty[$ but with smallness condition
on initial inhomogeneity.
  A continuation criterion and a lower bound for the lifespan of the solution
are proved as well. In particular in dimension 2, the lower bound goes to
infinity as the initial density tends to a constant.


title:
iota Horologi, the first coronal activity cycle in a young solar-like
  star

abstract:
  Context: The shortest chromospheric (Ca II H&K) activity cycle (1.6 yr) has
been recently discovered in the young (~600 Myr) solar-like star iota Hor.
Coronal X-ray activity cycles have only been discovered in a few stars other
than the Sun, all of them with an older age and a lower activity level than
iota Hor. Aims: We intended to find the X-ray coronal counterpart of the
chromospheric cycle for i Hor. This represents the first X-ray cycle observed
in an active star, as well as the paradigm of the first coronal cycles in the
life of a solar-like star. Methods: We monitored i Hor with XMM-Newton
observations spanning almost two years. The spectra of each observation are fit
with two-temperature coronal models to study the long-term variability of the
star. Results: We find a cyclic behavior in X-rays very similar to the
contemporaneous chromospheric cycle. The continuous chromospheric monitoring
for more than three cycle lengths shows a trend toward decreasing amplitude,
apparently modulated by a longer term trend. The second cycle is disrupted
prior to reaching its maximum, followed by a brief episode of chaotic
variability before the cyclic behavior resumes, only to be disrupted again
after slightly more than one cycle. Conclusions: We confirm the presence of an
activity cycle of ~1.6 yr in i Hor both in X-rays and Ca II H&K. It is likely
subject to the modulation of a longer, not yet constrained second cycle. The
1.6 yr cycle is the shortest coronal one observed to date, and i Hor represents
the most active star for which a coronal activity cycle has been found. This
cycle is probably representative of the first coronal cycles in the life of a
solar-like star, at the age when life started on Earth.


title:
A note on non-homogeneous hyperbolic operators with low-regularity
  coefficients

abstract:
  In this paper we obtain an energy estimate for a complete strictly hyperbolic
operator with second order coefficients satisfying a log-Zygmund-continuity
condition with respect to $t$, uniformly with respect to $x$, and a
log-Lipschitz-continuity condition with respect to $x$, uniformly with respect
to $t$.


title: Distribution of HNCO 5$_{05}-4_{04}$ in Massive Star-forming Regions

abstract:
  The goal of this paper is to study the spatial distribution of HNCO in
massive star-forming regions, and investigate its spatial association with
infrared sources, as well as physical conditions in region of HNCO emission. We
have mapped nine massive star-forming regions in HNCO 5$_{05}-4_{04}$ with the
Purple Mountain Observatory 13.7m telescope. The C18O maps of these sources
were obtained simultaneously. The HNCO emission shows compact distribution,
with emission peak centred on water masers. Nearly all the HNCO clumps show
signs of embedded mid-infrared or far-infrared sources. The FWHM sizes of HNCO
clumps are significantly smaller than C18O clumps but rather similar to HC3N
clumps. We also found good correlation between the integrated intensities,
linewidths and LSR velocities of HNCO and HC3N emission, implying similar
excitation mechanism of these two species. As such, collisional excitation is
likely to be the dominant excitation mechanism for HNCO 5$_{05}-4_{04}$
emission in galactic massive star-forming regions.


title: Discovery of Methyl Acetate and Gauche Ethyl Formate in Orion

abstract:
  We report on the discovery of methyl acetate, CH3COOCH3, through the
detection of a large number of rotational lines from each one of the spin
states of the molecule: AA species (A1 or A2), EA species (E1), AE species
(E2), EE species (E3 or E4). We also report the detection, for the first time
in space, of the $gauche$ conformer of ethyl formate, CH3CH2OCOH, in the same
source. The trans conformer is also detected for the first time outside the
galactic center source SgrB2. From the derived velocity of the emission of
methyl acetate we conclude that it arises mainly from the compact ridge region
with a total column density of (4.2+-0.5)E15 cm(-2). The derived rotational
temperature is 150 K. The column density for each conformer of ethyl formate,
trans and gauche, is (4.5+-1.0)E14 cm(-2). Their abundance ratio indicates a
kinetic temperature of 135 K for the emitting gas and suggests that gas phase
reactions could participate efficiently in the formation of both conformers in
addition to cold ice mantle reactions on the surface of dust grains.


title: A Topological Approach to Unifying Compactifications of Symmetric Spaces

abstract:
  In this paper we present a topological way of building a compactification of
a symmetric space from a compactification of a Weyl Chamber.


title:
Practical Tikhonov Regularized Estimators in Reproducing Kernel Hilbert
  Spaces for Statistical Inverse Problems

abstract:
  Regularized kernel methods such as support vector machines (SVM) and support
vector regression (SVR) constitute a broad and flexible class of methods which
are theoretically well investigated and commonly used in nonparametric
classification and regression problems. As these methods are based on a
Tikhonov regularization which is also common in inverse problems, this article
investigates the use of regularized kernel methods for inverse problems in a
unifying way. Regularized kernel methods are based on the use of reproducing
kernel Hilbert spaces (RKHS) which lead to very good computational properties.
It is shown that similar properties remain true in solving statistical inverse
problems and that standard software implementations developed for ordinary
regression problems can still be used for inverse regression problems.
Consistency of these methods and a rate of convergence for the risk is shown
under quite weak assumptions and rates of convergence for the estimator are
shown under somehow stronger assumptions. The applicability of these methods is
demonstrated in a simulation.


title:
Spectroscopic parameters of phosphine, PH3, in its ground vibrational
  state

abstract:
  The ground state rotational spectrum of PH3 has been reanalyzed taking into
account recently published very accurate data from sub-Doppler and conventional
absorption spectroscopy measurements as well as previous data from the
radio-frequency to the far-infrared regions. These data include Delta(J) =
Delta(K) = 0 transitions between A1 and A2 levels, Delta(J) = 0, Delta(K) = 3
transitions as well as regular Delta(J) = 1, Delta(K) = 0 rotational
transitions. Hyperfine splitting caused by the 31P and 1H nuclei has been
considered, and the treatment of the A1/A2 splitting has been discussed
briefly. Improved spectroscopic parameters have been obtained. Interestingly,
the most pronounced effects occured for the hyperfine parameters.


title: Counting Spectral Radii of Matrices with Positive Entries

abstract:
  The sum-product conjecture of Erd\H os and Szemer\'edi states that, given a
finite set $A$ of positive numbers, one can find asymptotic lower bounds for
$\max\{|A+A|,|A\cdot A|\}$ of the order of $|A|^{1+\delta}$ for every $\delta
<1$. In this paper we consider the set of all spectral radii of $n\times n$
matrices with entries in $A$, and find lower bounds for the cardinality of this
set. In the case $n=2$, this cardinality is necessarily larger than
$\max\{|A+A|,|A\cdot A|\}$.


title: Temperature of projectile like fragments in heavy ion collisions

abstract:
  A model in which a projectile like fragment can be simply regarded as a
remnant after removal of some part of the projectile leads to an excited
fragment. This excitation energy can be calculated with a Hamiltonian that
gives correct nuclear matter binding, compressibility and density distribution
in finite nuclei. In heavy ion collisions the model produces a dependence of
excitation energy on impact parameter which appears to be correct but the
magnitude of the excitation energy falls short. It is argued that dynamic
effects left out in the model will increase this magnitude. The model can be
directly extended to include dynamics but at the expense of increased
computation. For many calculations for observables, a temperature is an easier
tool to use rather than an excitation energy. Hence temperature dependences on
impact parameter in heavy ion collisions are displayed.


title:
Acoustic Echo Cancellation Postfilter Design Issues For Speech
  Recognition System

abstract:
  In this paper a generalized postfilter algorithm design issues are presented.
This postfilter is used to jointly suppress late reverberation, residual echo,
and background noise. When residual echo and noise are suppressed, the best
result obtains by suppressing both interferences together after the Acoustic
echo cancellation (AEC). The main advantage of this approach is that the
residual echo and noise suppression does not suffer from the existence of a
strong acoustic echo component. Furthermore, the Acoustic echo cancellation
(AEC) does not suffer from the time-varying noise suppression. A disadvantage
is that the input signal of the Acoustic echo cancellation (AEC) has a low
signal-to-noise ratio (SNR). To overcome this problem, algorithms have been
proposed where, apart from the joint suppression, a noise-reduced signal is
used to adapt the echo canceller.


title: Streamers in air splitting into three branches

abstract:
  We investigate the branching of positive streamers in air and present the
first systematic investigation of splitting into more than two branches. We
study discharges in 100 mbar artificial air that is exposed to voltage pulses
of 10 kV applied to a needle electrode 160 mm above a grounded plate. By
imaging the discharge with two cameras from three angles, we establish that
about every 200th branching event is a branching into three. Branching into
three occurs more frequently for the relatively thicker streamers. In fact, we
find that the surface of the total streamer cross-sections before and after a
branching event is roughly the same.


title:
The $k$-th derivatives of the immanant and the $\chi$-symmetric power of
  an operator

abstract:
  In recent papers, R. Bhatia, T. Jain and P. Grover obtained formulas for
directional derivatives, of all orders, of the determinant, the permanent, the
$m$-th compound map and the $m$-th induced power map. In this paper we
generalize these results for immanants and for other symmetric powers of a
matrix.


title:
The norm of the $k$-th derivative of the $\chi$-symmetric power of an
  operator

abstract:
  In this paper we present the exact value for the norm of directional
derivatives, of all orders, for symmetric tensor powers of operators on finite
dimensional vector spaces. Using this result we obtain an upper bound for the
norm of all directional derivatives of immanants.
  This work is inspired in results by R. Bhatia, J. Dias da Silva, P. Grover
and T. Jain.


title:
Techniques for Feature Extraction In Speech Recognition System : A
  Comparative Study

abstract:
  The time domain waveform of a speech signal carries all of the auditory
information. From the phonological point of view, it little can be said on the
basis of the waveform itself. However, past research in mathematics, acoustics,
and speech technology have provided many methods for converting data that can
be considered as information if interpreted correctly. In order to find some
statistically relevant information from incoming data, it is important to have
mechanisms for reducing the information of each segment in the audio signal
into a relatively small number of parameters, or features. These features
should describe each segment in such a characteristic way that other similar
segments can be grouped together by comparing their features. There are
enormous interesting and exceptional ways to describe the speech signal in
terms of parameters. Though, they all have their strengths and weaknesses, we
have presented some of the most used methods with their importance.


title: How to Collaborate between Threshold Schemes

abstract:
  Threshold schemes have been used to protect secrets by distributing shares to
participants. To protect two secrets, we can use two separate traditional
schemes, say, a (t1, n1) scheme and a (t2, n2) scheme. If there are u
(<=min(t1, t2)) participants involved in both schemes, each of these u
participants must keep two different shares. This paper proposes a method that
allows each common participant to keep only one share. Our method constructs
two polynomials with u common crossover points. We give theoretical details and
two demonstrative examples. This algorithm can also handle the collaboration
between more than two schemes.


title:
Nonlinear modes in binary bosonic condensates with the
  pseudo-spin-orbital coupling

abstract:
  We consider a binary Bose-Einstein condensate (BEC) with nonlinear repulsive
interactions and linear spin-orbit (SO) and Zeeman-splitting couplings. In the
presence of the trapping harmonic-oscillator (HO) potential, we report the
existence of even, odd, and asymmetric spatial modes. They feature alternating
domains with opposite directions of the pseudo-spin, i.e., anti-ferromagnetic
structures, which is explained by the interplay of the linear couplings, HO
confinement, and repulsive self-interaction. The number of the domains is
determined by the strength of the SO coupling. The modes are constructed
analytically in the weakly nonlinear system. The dynamical stability of the
modes is investigated by means of the Bogoliubov-de Gennes equations and direct
simulations. A notable result is that the multi-domain-wall (DW) structures are
stable, alternating between odd and even shapes, while the simplest single-DW
structure is unstable. Thus, the system features a transition to the complex
ground states under the action of the SO coupling. The addition of the Zeeman
splitting transforms the odd modes into asymmetric ones via spontaneous
symmetry breaking. The results suggest possibilities for switching the binary
system between states with opposite (pseudo) magnetization by external fields,
and realization of similar stable states and dynamical effects in solid-state
and nonlinear-optical settings emulated by the SO-coupled BECs.


title:
Measuring Leaf Chlorophyll Concentration from Its Color: A Way in
  Monitoring Environment Change to Plantations

abstract:
  Leaf colors of a plant can be used to identify stress level due to its
adaptation to environmental change. For most leaves green-related colors are
sourced from chlorophyll a and b. Chlorophyll concentration is normally
measured using a spectrophotometer in laboratory. In some remote observation
places, it is impossible to collect the leaves, preserve them, and bring them
to laboratory to measure their chlorophyll content. Based on this need,
measurement of chlorophyll content is observed through its color. Using CIE
chromaticity diagram leaf color information in RGB is transformed into
wavelength (in nm). Paddy seed with variety name IR-64 is used in observation
during its vegetation stage t (age of 0-10 days). Light exposure time {\tau} is
chosen as environmental change, which normally should be about 12 hours/day, is
varied (0-12 hours/day). Each day sample from different exposure time is taken,
its color is recorded using HP Deskjet 1050 scanner with 1200 dpi, and its
chlorophyll content is obtained from absorption spectrum measured using
Campspec M501 Single Beam UV/Vis Spectrophotometer after it is rinsed in 85 %
acetone solution and the information from the spectrum is calculated using
Arnon method. It has been observed that average wavelength of leaf color
{\lambda}avg is decreased from 570.55 nm to 566.01 nm as is measured for t = 1
- 10 days with {\tau} = 9 hours/day, but chlorophyll concentration C is
increased from 0.015 g/l to 3.250 g/l and from 0.000 g/l to 0.774 g/l for
chlorophyll a and b, respectively. Other value of {\tau} gives similar results.
Based on these results an empirical relation between concentration of
chlorophyll a Cc-a and its wavelength {\lambda}avg can be formulated.


title: Entropy and complexity analysis of hydrogenic Rydberg atoms

abstract:
  The internal disorder of hydrogenic Rydberg atoms as contained in their
position and momentum probability densities is examined by means of the
following information-theoretic spreading quantities: the radial and
logarithmic expectation values, the Shannon entropy and the Fisher information.
As well, the complexity measures of Cr\'amer-Rao, Fisher-Shannon and LMC types
are investigated in both reciprocal spaces. The leading term of these
quantities is rigorously calculated by use of the asymptotic properties of the
concomitant entropic functionals of the Laguerre and Gegenbauer orthogonal
polynomials which control the wavefunctions of the Rydberg states in both
position and momentum spaces. The associated generalized Heisenberg-like,
logarithmic and entropic uncertainty relations are also given. Finally,
application to linear ($l=0$), circular ($l=n-1$) and quasicircular ($l=n-2$)
states is explicitly done.


title: Overview of the Geometries of Shape Spaces and Diffeomorphism Groups

abstract:
  This article provides an overview of various notions of shape spaces,
including the space of parametrized and unparametrized curves, the space of
immersions, the diffeomorphism group and the space of Riemannian metrics. We
discuss the Riemannian metrics that can be defined thereon, and what is known
about the properties of these metrics. We put particular emphasis on the
induced geodesic distance, the geodesic equation and its well-posedness,
geodesic and metric completeness and properties of the curvature.


title:
Dynamic Mott gap from holographic fermions in geometries with
  hyperscaling violation

abstract:
  We investigate a dynamically generated Mott gap from holographic fermions in
asymptotically geometries with hyperscaling violation by employing a bulk
dipole coupling for the fermion field. We find that when the coupling strength
increases the spectral function first transfers to the negative frequency
region but soon redistributes to the positive region. A stable gap and two
bands emerges for all momentum when the coupling strength beyonds a critical
value. Generally, The upper band on the positive frequency axis is much sharper
than the lower band on the negative side. When the diploe coupling increases
further, the gap becomes larger and the up band still keeps sharp while the
lower band disperses and widens, concentrating on the small momentum region. We
also find that the bands will be smoothed out gradually with the increasing of
hyperscaling violation.


title:
Estimating Interaction Strengths with Correlations in Annual Relative
  Weight: Interspecific Competition and Predation in Fishes, Pueblo Reservoir,
  Colorado

abstract:
  Quantifying interaction strength between species is of interest in food web
studies for understanding population dynamics. Theory has run ahead of
experiment in solving equations describing ecological systems (the
Lotka-Volterra equations, for example). Modeling approaches depend upon
quantitative knowledge of interaction strengths among species, yet there are
few methods available for estimating strengths of interactions between species,
especially in the field. Competition and predation in fishes is traditionally
studied with a variety of methods, most requiring extensive sampling to
determine stock densities or extensive stomach content or isotope analysis.
Average relative weight of fish species in an ecosystem can usually be
accurately determined with much smaller sample sizes than required for accurate
determination of stock densities. Correlations of mean annual relative weights
may be used to test hypotheses and establish interaction strengths regarding
competition and predation among fishes. The trends are sufficiently suggestive
to use a strong positive correlation as supporting evidence of competition and
possibly indicative of the magnitude of competition if other evidence such as
analysis of stomach contents is also present. Likewise, a strong negative
correlation might be interpreted as relevant when forming a hypothesis of
predation and as supporting evidence of the magnitude of predation if other
evidence is also present. In systems where regular weight and length survey
data are available, this method can suggest the likely strength of competitive
and predatory relationships and may be more cost effective than stomach content
or isotope analysis.


title:
Dust-to-metal ratios in damped Lyman-alpha absorbers: Fresh clues to the
  origins of dust and optical extinction towards gamma-ray bursts

abstract:
  Motivated by the anomalous dust-to-metal ratios derived in the literature for
gamma-ray burst (GRB) damped Lyman-alpha absorbers (DLAs), we measure these
ratios using the dust-depletion pattern observed in UV/optical afterglow
spectra associated with the ISM at the GRB host-galaxy redshifts. Our sample
consists of 20 GRB absorbers and a comparison sample of 72 QSO-DLAs with
redshift 1.2 < z < 4.0 and down to Z = 0.002 Z_Sol metallicities. The
dust-to-metal ratio in QSO- and GRB-DLAs increases both with metallicity and
metal column density, spanning ~10--110% of the Galactic value and pointing to
a non universal dust-to-metal ratio. The low values of dust-to-metal ratio
suggest that low-metallicity systems have lower dust fractions than typical
spiral galaxies and perhaps that the dust in these systems is produced
inefficiently, i.e. by grain growth in the low-metallicity regime with
negligible contribution from supernovae (SNe) and asymptotic giant branch (AGB)
stars. On the other hand, some GRB- and QSO-DLAs show high dust-to-metal ratio
values out to z ~ 4, requiring rapid dust production, such as in SN ejecta, but
also in AGB winds and via grain growth for the highest metallicity systems.
GRB-DLAs overall follow the dust-to-metal-ratio properties of QSO-DLAs, GRBs
probing up to larger column and volume densities. For comparison, the
dust-to-metal ratio that we derive for the SMC and LMC are ~82--100% and ~98%
of the Galactic value, respectively. The literature dust-to-metal ratio of the
low-metallicity galaxy I Zw 18 (< 37%) is consistent with the distribution that
we find. The dust extinction Av increases steeply with the column density of
iron in dust, N(Fe)dust, calculated from relative metal abundances, confirming
that dust extinction is mostly occurring in the host galaxy ISM. Most GRB-DLAs
display log N(Fe)dust > 14.7, above which several QSO-DLAs reveal H2
(abridged).


title: Ion-mediated RNA structural collapse: effect of spatial confinement

abstract:
  RNAs are negatively charged molecules residing in macromolecular crowding
cellular environments. Macromolecular confinement can influence the ion effects
in RNA folding. In this work, using the recently developed tightly bound ion
model for ion fluctuation and correlation, we investigate the confinement
effect on the ion-mediated RNA structural collapse for a simple model system.
We found that, for both Na$^+$ and Mg$^{2+}$, ion efficiencies in mediating
structural collapse/folding are significantly enhanced by the structural
confinement. Such an enhancement in the ion efficiency is attributed to the
decreased electrostatic free energy difference between the compact conformation
ensemble and the (restricted) extended conformation ensemble due to the spatial
restriction.

categories: physics.bio-ph cond-mat.soft physics.chem-ph q-bio.BM


title: Efficient computation of trees with minimal atom-bond connectivity index

abstract:
  The {\em atom-bond connectivity (ABC) index} is one of the recently most
investigated degree-based molecular structure descriptors, that have
applications in chemistry. For a graph $G$, the ABC index is defined as
$\sum_{uv\in E(G)}\sqrt{\frac{(d(u) +d(v)-2)}{d(u)d(v)}}$, where $d(u)$ is the
degree of vertex $u$ in $G$ and $E(G)$ is the set of edges of $G$. Despite many
attempts in the last few years, it is still an open problem to characterize
trees with minimal $ABC$ index. In this paper, we present an efficient approach
of computing trees with minimal ABC index, by considering the degree sequences
of trees and some known properties of the graphs with minimal $ABC$ index. The
obtained results disprove some existing conjectures end suggest new ones to be
set.


title: Anomalous resistance overshoot in the integer quantum Hall effect

abstract:
  In this work we report experiments on defined by shallow etching narrow Hall
bars. The magneto-transport properties of intermediate mobility two-dimensional
electron systems are investigated and analyzed within the screening theory of
the integer quantized Hall effect. We observe a non-monotonic increase of Hall
resistance at the low magnetic field ends of the quantized plateaus, known as
the overshoot effect. Unexpectedly, for Hall bars that are defined by shallow
chemical etching the overshoot effect becomes more pronounced at elevated
temperatures. We observe the overshoot effect at odd and even integer plateaus,
which favor a spin independent explanation, in contrast to discussion in the
literature. In a second set of the experiments, we investigate the overshoot
effect in gate defined Hall bar and explicitly show that the amplitude of the
overshoot effect can be directly controlled by gate voltages. We offer a
comprehensive explanation based on scattering between evanescent incompressible
channels.


title: Parallel String Sample Sort

abstract:
  We discuss how string sorting algorithms can be parallelized on modern
multi-core shared memory machines. As a synthesis of the best sequential string
sorting algorithms and successful parallel sorting algorithms for atomic
objects, we propose string sample sort. The algorithm makes effective use of
the memory hierarchy, uses additional word level parallelism, and largely
avoids branch mispredictions. Additionally, we parallelize variants of multikey
quicksort and radix sort that are also useful in certain situations.


title:
Bessel beams of two-level atoms driven by a linearly polarized laser
  field

abstract:
  We study Bessel beams of two-level atoms that are driven by a linearly
polarized laser field. Starting from the Schroedinger equation, we determine
the states of two-level atoms in a plane-wave field respecting propagation
directions both of the atom and the field. For such laser-driven two-level
atoms, we construct Bessel beams beyond the typical paraxial approximation. We
show that the probability density of these atomic beams obtains a non-trivial,
Bessel-squared-type behavior and can be tuned under the special choice of the
atom and laser parameters, such as the nuclear charge, atom velocity, laser
frequency, and propagation geometry of the atom and laser beams. Moreover, we
spatially and temporally characterize the beam of hydrogen and selected
(neutral) alkali-metal atoms that carry non-zero orbital angular momentum
(OAM). The proposed spatiotemporal Bessel states (i) are able to describe, in
principle, twisted states of any two-level system which is driven by the
radiation field and (ii) have potential applications in atomic, nuclear
processes and quantum communication.


title: On polymorphism-homogeneous relational structures and their clones

abstract:
  A relational structure is homomorphism-homogeneous if every homomorphism
between finite substructures extends to an endomorphism of the structure. This
notion was introduced recently by Cameron and Ne\v{s}et\v{r}il. In this paper
we consider a strengthening of homomorphism-homogeneity --- we call a
relational structure polymorphism-homogeneous if every partial polymorphism
with a finite domain extends to a global polymorphism of the structure. It
turns out that this notion (under various names and in completely different
contexts) has been existing in algebraic literature for at least 30 years.
Motivated by this observation, we dedicate this paper to the topic of
polymorphism-homogeneous structures. We study polymorphism-homogeneity from a
model-theoretic, an algebraic, and a combinatorial point of view. E.g., we
study structures that have quantifier elimination for positive primitive
formulae, and show that this notion is equivalent to polymorphism-homogeneity
for weakly oligomorphic structures. We demonstrate how the Baker-Pixley theorem
can be used to show that polymorphism-homogeneity is a decidable property for
finite relational structures. Eventually, we completely characterize the
countable polymorphism-homogeneous graphs, the polymorphism-homogeneous posets
of arbitrary size, and the countable polymorphism-homogeneous strict posets.


title:
Dzyaloshinsky-Moriya driven helical-butterfly structure in
  Ba3NbFe3Si2O14

abstract:
  We have used soft x-ray magnetic diffraction at the Fe3+ L2,3 edges to
examine to what extent the Dzyaloshinsky-Moriya interaction in Ba3NbFe3Si2O14
influences its low temperature magnetic structure. A modulated component of the
moments along the c-axis is present, adding to the previously proposed helical
magnetic configuration of co-planar moments in the a,b-plane. This leads to a
helical-butterfly structure and suggests that both the multi-axial in-plane and
the uniform out-of-plane Dzyaloshinsky-Moriya vectors are relevant. A non zero
orbital magnetic signal is also observed at the oxygen K edge, which reflects
the surprisingly strong hybridization between iron 3d and oxygen 2p states,
given the nominal spherical symmetry of the Fe3+ half filled shell.


title:
Two-orbital view on the origin of the material dependence of Tc in the
  single-layer cuprates

abstract:
  Using the dx2-y2+dz2 two orbital model of the high Tc cuprates obtained from
the first-principle calculation, we show that the material dependence of the
Fermi surface shape can be understood by the degree of the mixture between the
dx2-y2$ and the dz2 orbitals. We explain, through investigating the
tightbinding hopping integrals, why some cuprates have square shaped Fermi
surface, while others have more rounded ones. From this viewpoint, we explain
the experimentally observed correlation between the curvature of the Fermi
surface and Tc.


title: Stick-Slip Sliding of Water Drops on Chemically Heterogeneous Surfaces

abstract:
  We present a comprehensive study of water drops sliding down chemically
heterogeneous surfaces formed by a periodic pattern of alternating hydrophobic
and hydrophilic stripes. Drops are found to undergo a stick-slip motion whose
average speed is an order of magnitude smaller than that measured on a
homogeneous surface having the same static contact angle. This motion is the
result of the periodic deformations of the drop interface when crossing the
stripes. Numerical simulations confirm this view and are used to elucidate the
principles underlying the experimental observations.


title: A Computer Vision System for Attention Mapping in SLAM based 3D Models

abstract:
  The study of human factors in the frame of interaction studies has been
relevant for usability engi-neering and ergonomics for decades. Today, with the
advent of wearable eye-tracking and Google glasses, monitoring of human factors
will soon become ubiquitous. This work describes a computer vision system that
enables pervasive mapping and monitoring of human attention. The key
contribu-tion is that our methodology enables full 3D recovery of the gaze
pointer, human view frustum and associated human centred measurements directly
into an automatically computed 3D model in real-time. We apply RGB-D SLAM and
descriptor matching methodologies for the 3D modelling, locali-zation and fully
automated annotation of ROIs (regions of interest) within the acquired 3D
model. This innovative methodology will open new avenues for attention studies
in real world environments, bringing new potential into automated processing
for human factors technologies.


title: Vertical flows and mass flux balance of sunspot umbral dots

abstract:
  A new Stokes inversion technique that greatly reduces the effect of the
spatial point spread function of the telescope is used to constrain the
physical properties of umbral dots (UDs). The depth-dependent inversion of the
Stokes parameters from a sunspot umbra recorded with Hinode SOT/SP revealed
significant temperature enhancements and magnetic field weakenings in the core
of the UDs in deep photospheric layers. Additionally, we found upflows of
around 960 m/s in peripheral UDs (i.e., UDs close to the penumbra) and
$\approx$ 600 m/s in central UDs. For the first time, we also detected
systematic downflows for distances larger than 200 km from the UD center that
balance the upflowing mass flux. In the upper photosphere, we found almost no
difference between the UDs and their diffuse umbral background.


title:
Combinatorial 8-Manifolds having Cohomology of the Quaternionic
  Projective Plane and Their Nonembeddings

abstract:
  In this paper we prove, that none of the three combinatorial 8- manifolds on
15 vertices constructed by Brehm and Kuhnel, each of which is a cohomology
quaternionic projective plane, can be combinatorially embedded in the Euclidean
12-space, though they have tight polyhedral embeddings in Euclidean 14-space.
This extends a similar method already known for the nonembeddings of real and
complex projective planes.


title:
Andreev reflection tuned by magnetic barriers in superconductor
  contacted graphene

abstract:
  The Andreev reflection of the normal state-superconductor junction both in
monolayer and bilayer graphene with a single magnetic barrier is investigated
by means of the Green's function formalism. Within the tight-binding model, we
study the direction-dependent Andreev reflection of two-dimensional
graphene-superconductor junctions in the specular and retro-reflection regimes.
The presence of a magnetic barrier close to the superconducting hybrid junction
introduces a rich phenomenology. Such a barrier is capable of tuning the
preferred angles of incidence for the Andreev reflection. In particular, it can
enhance the specular reflection probability for certain angles of incidence in
bilayer-based hybrid structures. When transmission is permitted, the Andreev
reflection manifests itself in isolated peaks and asymmetric resonances
associated with offsets and Fano-type oscillations in the transmission,
respectively. Moreover, Fabry-P\'{e}rot oscillations in the Andreev reflection
due to the interior scattering inside the magnetic barrier may appear. The
impacts of magnetic barriers on the monolayer and bilayer hybrid interfaces are
furthermore studied by calculating the differential conductances within the
Blonder-Tinkham-Klapwijk formula.


title:
Generalized black-box large deviation simulations: High-precision work
  distributions for extreme non-equilibrium processes in large systems

abstract:
  The distributions of work for strongly non-equilibrium processes are studied
using a very general form of a large-deviation approach, which allows one to
study distributions of almost arbitrary quantities of interest for equilibrium,
non-equilibrium stationary and even non-stationary processes. The method is
applied to varying quickly the external field in a wide range B=3 <-> 0 for
critical (T=2.269) two-dimensional Ising system of size LxL=128x128. To obtain
free energy differences from the work distributions, they must be studied in
ranges where the probabilities are as small as 10^{-240}, which is not possible
using direct simulation approaches. By comparison with the exact free energies,
which are available for this model for the zero-field case, one sees that the
present approach allows one to obtain the free energy with a very high relative
precision of 10^{-4}. This works well also for non-zero field, i.e., for a case
where standard umbrella-sampling methods seem to be not so efficient to
calculate free energies. Furthermore, for the present case it is verified that
the resulting distributions of work for forward and backward process fulfill
Crooks theorem with high precision. Finally, the free energy for the Ising
magnet as a function of the field strength is obtained.


title: Lips and swallow-tails of singularities of product maps

abstract:
  Lips and swallow-tails are generic local moves of singularities of a smooth
map to a 2-manifold. We prove that these moves of singularities of the product
map of two functions on a 3-manifold can be realized by isotopies of the
functions.


title: Multi-Objective AI Planning: Comparing Aggregation and Pareto Approaches

abstract:
  Most real-world Planning problems are multi-objective, trying to minimize
both the makespan of the solution plan, and some cost of the actions involved
in the plan. But most, if not all existing approaches are based on
single-objective planners, and use an aggregation of the objectives to remain
in the single-objective context. Divide and Evolve (DaE) is an evolutionary
planner that won the temporal deterministic satisficing track at the last
International Planning Competitions (IPC). Like all Evolutionary Algorithms
(EA), it can easily be turned into a Pareto-based Multi-Objective EA. It is
however important to validate the resulting algorithm by comparing it with the
aggregation approach: this is the goal of this paper. The comparative
experiments on a recently proposed benchmark set that are reported here
demonstrate the usefulness of going Pareto-based in AI Planning.


title:
Isotropic Gaussian random fields on the sphere: Regularity, fast
  simulation and stochastic partial differential equations

abstract:
  Isotropic Gaussian random fields on the sphere are characterized by
Karhunen-Lo\`{e}ve expansions with respect to the spherical harmonic functions
and the angular power spectrum. The smoothness of the covariance is connected
to the decay of the angular power spectrum and the relation to sample
H\"{o}lder continuity and sample differentiability of the random fields is
discussed. Rates of convergence of their finitely truncated Karhunen-Lo\`{e}ve
expansions in terms of the covariance spectrum are established, and algorithmic
aspects of fast sample generation via fast Fourier transforms on the sphere are
indicated. The relevance of the results on sample regularity for isotropic
Gaussian random fields and the corresponding lognormal random fields on the
sphere for several models from environmental sciences is indicated. Finally,
the stochastic heat equation on the sphere driven by additive, isotropic Wiener
noise is considered, and strong convergence rates for spectral discretizations
based on the spherical harmonic functions are proven.


title:
Analysis of a carbon dimer bound to a vacancy in iron using density
  functional theory and a new tight binding model

abstract:
  Recent density functional theory (DFT) calculations by Foerst et al. have
predicted that vacancies in both low and high carbon steels have a carbon dimer
bound to them. This is likely to change the thinking of metallurgists in the
kinetics of the development of microstructures. While the notion of a C2
molecule bound to a vacancy in Fe will potentially assume a central importance
in the atomistic modeling of steels, neither a recent tight binding (TB) model
nor existing classical interatomic potentials can account for it. Here we
present a new TB model for C in Fe, based on our earlier work for H in Fe,
which correctly predicts the structure and energetics of the carbon dimer at a
vacancy in Fe. Moreover the model is capable of dealing with both concentrated
and dilute limits of carbon in both bcc-Fe and fcc-Fe as comparisons with DFT
show. We use both DFT and TB to make a detailed analysis of the dimer and to
come to an understanding as to what governs the choice of its curious
orientation within the vacancy.


title: Gromov-Hausdorff Approximation of Metric Spaces with Linear Structure

abstract:
  In many real-world applications data come as discrete metric spaces sampled
around 1-dimensional filamentary structures that can be seen as metric graphs.
In this paper we address the metric reconstruction problem of such filamentary
structures from data sampled around them. We prove that they can be
approximated, with respect to the Gromov-Hausdorff distance by well-chosen Reeb
graphs (and some of their variants) and we provide an efficient and easy to
implement algorithm to compute such approximations in almost linear time. We
illustrate the performances of our algorithm on a few synthetic and real data
sets.


title: Total positivity of a Cauchy kernel

abstract:
  We study the total positivity of the kernel $1/(x^2 + 2 \cos(\pi\a)xy +y^2).$
The case of infinite order is characterized by an application of Schoenberg's
theorem. We then give necessary conditions for the cases of any given finite
order with the help of Chebyshev polynomials of the second kind. Sufficient
conditions for the finite order cases are also obtained, thanks to Propp's
formula for the Izergin-Korepin determinant. As a by-product, we give a partial
answer to a question of Karlin on positive stable semi-groups.


title: On nilpotent and solvable Lie algebras of derivations

abstract:
  Let K be a field and A be a commutative associative K-algebra which is an
integral domain. The Lie algebra Der A of all K-derivations of A is an A-module
in a natural way and if R is the quotient field of A, then RDer A is a vector
space over R. It is proved that if L is a nilpotent subalgebra of RDer A of
rank k over R (i.e. such that dim_{R}RL=k), then the derived length of L is at
most k and L is finite dimensional over its field of constants. In case of
solvable Lie algebras over a field of characteristic zero their derived length
does not exceed 2k. Nilpotent and solvable Lie algebras of rank 1 and 2 (over
R) from the Lie algebra RDer A are characterized. As a consequence we obtain
the same estimations for nilpotent and solvable Lie algebras of vector fields
with polynomial, rational, or formal coefficients.


title:
IMDB network revisited: unveiling fractal and modular properties from a
  typical small-world network

abstract:
  We study a subset of the movie collaboration network, imdb.com, where only
adult movies are included. We show that there are many benefits in using such a
network, which can serve as a prototype for studying social interactions. We
find that the strength of links, i.e., how many times two actors have
collaborated with each other, is an important factor that can significantly
influence the network topology. We see that when we link all actors in the same
movie with each other, the network becomes small-world, lacking a proper
modular structure. On the other hand, by imposing a threshold on the minimum
number of links two actors should have to be in our studied subset, the network
topology becomes naturally fractal. This occurs due to a large number of
meaningless links, namely, links connecting actors that did not actually
interact. We focus our analysis on the fractal and modular properties of this
resulting network, and show that the renormalization group analysis can
characterize the self-similar structure of these networks.


title:
Isoscalar-vector interaction and hybrid quark core in massive neutron
  stars

abstract:
  The hadron-quark phase transition in the core of massive neutron stars is
studied with a newly constructed two-phase model. For nuclear matter, a
nonlinear Walecka type model with general nucleon-meson and meson-meson
couplings, recently calibrated by Steiner, Hemper and Fischer, is taken. For
quark matter, a modified Polyakov-Nambu--Jona-Lasinio (mPNJL) model, which
gives consistent results with lattice QCD data, is used. Most importantly, we
introduce an isoscalar-vector interaction in the description of quark matter,
and we study its influence on the hadron-quark phase transition in the interior
of massive neutron stars. With the constraints of neutron star observations,
our calculation shows that the isoscalar-vector interaction between quarks is
indispensable if massive hybrids star exist in the universe, and its strength
determines the onset density of quark matter, as well as the mass-radius
relations of hybrid stars. Furthermore, as a connection with
heavy-ion-collision experiments we give some discussions about the strength of
isoscalar-vector interaction and its effect on the signals of hadron-quark
phase transition in heavy-ion collisions, in the energy range of the NICA at
JINR-Dubna and FAIR at GSI-Darmstadt facilities.


title:
Interaction-induced chiral p_x \pm i p_y superfluid order of bosons in
  an optical lattice

abstract:
  The study of superconductivity with unconventional order is complicated in
condensed matter systems by their extensive complexity. Optical lattices with
their exceptional precision and control allow one to emulate superfluidity
avoiding many of the complications of condensed matter. A promising approach to
realize unconventional superfluid order is to employ orbital degrees of freedom
in higher Bloch bands. In recent work, indications were found that bosons
condensed in the second band of an optical chequerboard lattice might exhibit
p_x \pm i p_y order. Here we present experiments, which provide strong evidence
for the emergence of p_x \pm i p_y order driven by the interaction in the local
p-orbitals. We compare our observations with a multi-band Hubbard model and
find excellent quantitative agreement.


title:
Index of a finitistic space and a generalization of the topological
  central point theorem

abstract:
  In this paper we prove that if $G$ is a p-torus (resp. torus) group acting
without fixed points on a finitistic space X (resp. with finitely many orbit
types), then the G-index $i_G(X) < 1$. Using this G-index we obtain a
generalization of the Central Point Theorem and also of the Tverberg Theorem
for any d-dimensional Hausdorff space.


title: Spatial heterogeneity in earthquake fault-like systems

abstract:
  The inhomogeneity of the materials with different physical properties in the
Earth is responsible for a wide variety of spatial and temporal behaviors. In
this work, we study an earthquake fault model based on Olami-Feder-Christensen
(OFC) and Rundle-Jackson-Brown (RJB) cellular automata models with particular
aspects of spatial heterogeneities and long-range stress interactions. In our
model some localized stress accumulators are added into the system by
converting a percentage of randomly selected sites into stronger sites which
are called asperity cells. These asperity cells support much higher failure
stresses than the surrounding regular lattice sites but eventually rupture when
the applied stress reaches their threshold stress. We find that changing the
spatial configuration of those stronger sites generally increases capability of
the fault system to generate larger events, but that the total percentage of
asperities is important as well. We also observe an increasing number of larger
events associated with the total number of asperities in the lattice.


title:
Nonlinear free fall of one-dimensional rigid bodies in hyperviscous
  fluids

abstract:
  We consider the free fall of slender rigid bodies in a viscous incompressible
fluid. We show that the dimensional reduction (DR), performed by substituting
the slender bodies with one-dimensional rigid objects, together with a
hyperviscous regularization (HR) of the Navier--Stokes equation for the
three-dimensional fluid lead to a well-posed fluid-structure interaction
problem. In contrast to what can be achieved within a classical framework, the
hyperviscous term permits a sound definition of the viscous force acting on the
one-dimensional immersed body. Those results show that the DR/HR procedure can
be effectively employed for the mathematical modeling of the free fall problem
in the slender-body limit.


title:
Reactions with pions and vector mesons in the sector of odd intrinsic
  parity

abstract:
  The Wess-Zumino-Witten structure is supplemented by a simple vector-meson
Lagrangian where the vector mesons are described by antisymmetric tensor
fields. With the \rho-\omega-\pi{} coupling as the only parameter in the sector
of odd intrinsic parity, i.e. without additional contact terms, one can achieve
a proper description of the decay of an \omega-meson into three pions, the
single- and double-virtual pion transition form factor and the three-pion
production in electron-positron collisions.


title: On the cycle class map for zero-cycles over local fields

abstract:
  We study the Chow group of zero-cycles of smooth projective varieties over
local and strictly local fields. We prove in particular the injectivity of the
cycle class map to integral l-adic cohomology for a large class of surfaces
with positive geometric genus, over local fields of residue characteristic
different from l. The same statement holds for semistable K3 surfaces defined
over C((t)), but does not hold in general for surfaces over strictly local
fields.


title: Optimizing CUDA Code By Kernel Fusion---Application on BLAS

abstract:
  Modern GPUs are able to perform significantly more arithmetic operations than
transfers of a single word to or from global memory. Hence, many GPU kernels
are limited by memory bandwidth and cannot exploit the arithmetic power of
GPUs. However, the memory locality can be often improved by kernel fusion when
a sequence of kernels is executed and some kernels in this sequence share data.
  In this paper, we show how kernels performing map, reduce or their nested
combinations can be fused automatically by our source-to-source compiler. To
demonstrate the usability of the compiler, we have implemented several BLAS-1
and BLAS-2 routines and show how the performance of their sequences can be
improved by fusions.
  Compared to similar sequences using CUBLAS, our compiler is able to generate
code that is up to 2.61x faster for the examples tested.


title:
Probabilistic wind speed forecasting using Bayesian model averaging with
  truncated normal components

abstract:
  Bayesian model averaging (BMA) is a statistical method for post-processing
forecast ensembles of atmospheric variables, obtained from multiple runs of
numerical weather prediction models, in order to create calibrated predictive
probability density functions (PDFs). The BMA predictive PDF of the future
weather quantity is the mixture of the individual PDFs corresponding to the
ensemble members and the weights and model parameters are estimated using
ensemble members and validating observation from a given training period.
  In the present paper we introduce a BMA model for calibrating wind speed
forecasts, where the components PDFs follow truncated normal distribution with
cut-off at zero, and apply it to the ALADIN-HUNEPS ensemble of the Hungarian
Meteorological Service. Three parameter estimation methods are proposed and
each of the corresponding models outperforms the traditional gamma BMA model
both in calibration and in accuracy of predictions. Moreover, since here the
maximum likelihood estimation of the parameters does not require numerical
optimization, modelling can be performed much faster than in case of gamma
mixtures.


title:
Nonlocal response in thin-film waveguides: loss versus nonlocality and
  breaking of complementarity

abstract:
  We investigate the effects of nonlocal response on the surface-plasmon
polariton guiding properties of the metal-insulator (MI), metal-insulator-metal
(MIM), and insulator-metal-insulator (IMI) waveguides. The nonlocal effects are
described by a linearized hydrodynamic model, which includes the Thomas-Fermi
internal kinetic energy of the free electrons in the metal. We derive the
nonlocal dispersion relations of the three waveguide structures taking into
account also retardation and interband effects, and examine the delicate
interplay between nonlocal response and absorption losses in the metal. We also
show that nonlocality breaks the complementarity of the MIM and IMI waveguides
found in the non-retarded limit.


title:
Counterexample of the magnetorotational instability in two-dimensional
  axial symmetry

abstract:
  We analyze a linear perturbation scheme for a two-dimensional background
plasma, which is rotating with a differential frequency and is embedded in a
poloidal magnetic field. The main two assumptions of the present study, which
in turn are related, are that the plasma profile is axially symmetric, both in
the background and the perturbation approximation, where the azimuthal magnetic
field is requested to vanish identically and secondly the angular frequency on
the magnetic surface function only still holds in the non-stationary regime,
which, on the steady background equilibrium, is ensured by the validity of the
corotation theorem (Ferraro 1937). Indeed, such a restriction of the model is
rather natural and it implies that the azimuthal component of the linear plasma
shift is reabsorbed in the expression for the non stationary electric field (in
principle, at any order of approximation) and can no longer provide a non-zero
azimuthal component of the magnetic tension field. As a result, the
Magneto-rotational instability is suppressed and the magnetic field has the
effect to stabilize the plasma configuration with respect to the pure
hydrodynamical case.


title:
Calculation of the Performance of Communication Systems from Measured
  Oscillator Phase Noise

abstract:
  Oscillator phase noise (PN) is one of the major problems that affect the
performance of communication systems. In this paper, a direct connection
between oscillator measurements, in terms of measured single-side band PN
spectrum, and the optimal communication system performance, in terms of the
resulting error vector magnitude (EVM) due to PN, is mathematically derived and
analyzed. First, a statistical model of the PN, considering the effect of white
and colored noise sources, is derived. Then, we utilize this model to derive
the modified Bayesian Cramer-Rao bound on PN estimation, and use it to find an
EVM bound for the system performance. Based on our analysis, it is found that
the influence from different noise regions strongly depends on the
communication bandwidth, i.e., the symbol rate. For high symbol rate
communication systems, cumulative PN that appears near carrier is of relatively
low importance compared to the white PN far from carrier. Our results also show
that 1/f^3 noise is more predictable compared to 1/f^2 noise and in a fair
comparison it affects the performance less.


title:
Universal inverse power-law distribution for temperature and rainfall in
  the UK region

abstract:
  Meteorological parameters, such as temperature, rainfall, pressure etc.,
exhibit selfsimilar space-time fractal fluctuations generic to dynamical
systems in nature such as fluid flows, spread of forest fires, earthquakes,
etc. The power spectra of fractal fluctuations display inverse power-law form
signifying long-range correlations. The author has developed a general systems
theory which predicts universal inverse power-law form incorporating the golden
mean for the fractal fluctuations of all size scales, i.e., small, large and
extreme values. The model predicted distribution is in close agreement with
observed fractal fluctuations in the historic month-wise temperature (maximum
and minimum) and rainfall in the UK region. The present study suggests that
fractal fluctuations result from the superimposition of an eddy continuum
fluctuations. The observed extreme values result from superimposition of maxima
(or minima) of dominant eddies (waves) in the eddy continuum.


title: Optical coherence in astrophysics: The powerful alternative of big bang

abstract:
  The coherence of the interaction of light with a collisionless gas (Einstein
1917) founds the theory of gas lasers. It is, for the understanding of
universe, a simpler and more powerful tool than the big bang which requires
questionable supplements (dark matter, MOND, etc..). The Impulsive Stimulated
Raman Scattering (ISRS) redshifts gradually light pulses which cross excited
atomic hydrogen H*, so that the redshift is a measure of the column density of
H*. Thus, the distance of the hot stars, surrounded by much H*, is exaggerated
by the use of Hubble's law. Local exaggerated distances create voids in the
maps of galaxies which become spongy. The interpretation of spectra of quasars,
the periodicity of galaxy redshifts introduce an experimental "Karlsson's
constant" exactly computed by ISRS. The need for dark matter comes from the
exaggeration of the distance, therefore the size of galaxies. Without dark
matter, celestial mechanics provides a reliable distance of spiral galaxies.
Coherence also introduces superradiance and mode competition that explain that
only the limbs of Str\"omgren spheres are visible as circles maybe punctuated
by an even number of dots: Too numerous, the figures assigned to gravitational
lenses can be such limbs. The coincidence of the ignition of the rings of
SNR1987A with the extinction of the star is due to a multiphoton coherent
scattering of star light, which amplifies the superradiant emission of the
rings.. A blueshift of microwaves crossing H* resulting, between 10 and 15 AU,
of the expansion of solar wind, explains the "anomalous acceleration" of
Pioneer probes. All is obtained without any change in theories of standard
spectroscopy.


title:
Cubic symmetric graphs having an abelian automorphism group with two
  orbits

abstract:
  Finite connected cubic symmetric graphs of girth 6 have been classified by K.
Kutnar and D. Maru\v{s}i\v{c}, in particular, each of these graphs has an
abelian automorphism group with two orbits on the vertex set. In this paper all
cubic symmetric graphs with the latter property are determined. In particular,
with the exception of the graphs K_4, K_{3,3}, Q_3, GP(5,2), GP(10,2), F40 and
GP(24,5), all the obtained graphs are of girth 6.


title:
Traveling Wavetrains in the Complex Cubic-Quintic Ginzburg-Landau
  Equation

abstract:
  In this paper we use a traveling wave reduction or a so-called spatial
approximation to comprehensively investigate the periodic solutions of the
complex cubic-quintic Ginzburg-Landau equation. The primary tools used here are
Hopf bifurcation theory and perturbation theory. Explicit results are obtained
for the post-bifurcation periodic orbits and their stability. Generalized and
degenerate Hopf bifurcations are also briefly considered to track the emergence
of global structure such as homoclinic orbits.


title:
Numerical Simulations of Snake Dissipative Solitons in Complex
  Cubic-Quintic Ginzburg-Landau Equation

abstract:
  Numerical simulations of the complex cubic-quintic Ginzburg-Landau equation
(CCQGLE), a canonical equation governing the weakly nonlinear behavior of
dissipative systems in a wide variety of disciplines, reveal five entirely
novel classes of pulse or solitary waves solutions, viz. pulsating, creeping,
snaking, erupting, and chaotical solitons. Here, we develop a theoretical
framework for analyzing the full spatio-temporal structure of one class of
dissipative solution (snaking soliton) of the CCQGLE using the variational
approximation technique and the dynamical systems theory. The qualitative
behavior of the snaking soliton is investigated using the numerical simulations
of (a) the full nonlinear complex partial differential equation and (b) a
system of three ordinary differential equations resulting from the variational
approximation.


title: Canonical Forms and Automorphisms in the Projective Space

abstract:
  Let $\C$ be a sequence of multisets of subspaces of a vector space $\F_q^k$.
We describe a practical algorithm which computes a canonical form and the
stabilizer of $\C$ under the group action of the general semilinear group. It
allows us to solve canonical form problems in coding theory, i.e. we are able
to compute canonical forms of linear codes, $\F_{q}$-linear block codes over
the alphabet $\F_{q^s}$ and random network codes under their natural notion of
equivalence. The algorithm that we are going to develop is based on the
partition refinement method and generalizes a previous work by the author on
the computation of canonical forms of linear codes.


title: Dirty-boson physics with magnetic insulators

abstract:
  We review recent theoretical and experimental efforts aimed at the
investigation of the physics of interacting disordered bosons (so-called dirty
bosons) in the context of quantum magnetism. The physics of dirty bosons is
relevant to a wide variety of condensed matter systems, encompassing Helium in
porous media, granular superconductors and ultracold atoms in disordered
optical potentials, to cite a few. Nevertheless, the understanding of the
transition from a localized, Bose-glass phase to an ordered, superfluid
condensate phase still represents a fundamentally open problem. Still to be
constructed is also a quantitative description of the highly inhomogeneous and
strongly correlated phases connected by the transition. We discuss how
disordered magnetic insulators in a strong magnetic field can provide a well
controlled realization of the above transition. Combining numerical simulations
with experiments on real materials can shed light on some fundamental
properties of the critical behavior, such as the scaling of the critical
temperature to condensation close to the quantum critical point.