title: Electron-capture supernovae as sources of 60Fe

abstract:
  We investigate the nucleosynthesis of the radionuclide 60Fe in
electron-capture supernovae (ECSNe). The nucleosynthetic results are based on a
self-consistent, two-dimensional simulation of an ECSN as well as models in
which the densities are systematically increased by some factors (low-entropy
models). 60Fe is found to be appreciably made in neutron-rich ejecta during the
nuclear quasi-equilibrium phase with greater amounts being produced in the
lower-entropy models. Our results, combining them with the yields of
core-collapse supernovae (CCSNe) in the literature, suggest that ECSNe account
for at least 4-30% of live 60Fe in the Milky Way. ECSNe co-produce neutron-rich
isotopes, 48Ca, 50Ti, 54Cr, some light trans-iron elements, and possibly weak
r-process elements including some radionuclides such as 93Zr, 99Tc, and 107Pd,
whose association with 60Fe might have been imprinted in primitive meteorites
or in the deep ocean crust on the Earth.


title:
Observation of Longitudinal Spin Seebeck Effect with Various Transition
  Metal Films

abstract:
  We evaluated the thermoelectric properties of longitudinal spin Seebeck
devices by using ten different transition metals (TMs). Both the intensity and
sign of spin Seebeck coefficients were noticeably dependent on the degree of
the inverse spin Hall effect and the resistivity of each TM film. Spin
dependent behaviors were also observed under ferromagnetic resonance. These
results indicate that the output of the spin Seebeck devices originates in the
spin current.


title: Report: A Model for Remote Parental Control System Using Smartphones

abstract:
  The mammoth growth in the information technology sector in terms of both
quantity and pervasiveness has opened up a Pandora's Box of issues which are
relevant in technical and social aspects. This paper attempts to address one of
the critical issues among them which is concerned with the proper utilization
of computer systems and mobile devices by children and teens. This paper
proposes a model termed "RePort (Remote Parental Control System using
Smartphones)" which is aimed towards monitoring the access behaviour of
computers and smartphones in general and internet to be specific, by teens and
children in a private environment. The model is built such that the access
behaviour shall be monitored from a remote location with the help of smartphone
devices. The access- characteristics are modelled using various parameters in
four different layers of the model.The proposed model is validated with a
prototype implementation in the Android platform for smartphones and as a
background service for computer systems. Various experiments were conducted on
the prototype implementation and results of the experiments validate the
efficiency of the proposed model with respect to user's relevancy metric which
is computed as 93.46%.


title:
A scaling relation between merger rate of galaxies and their close pair
  count

abstract:
  We study how to measure the galaxy merger rate from the observed close pair
count. Using a high-resolution N-body/SPH cosmological simulation, we find an
accurate scaling relation between galaxy pair counts and merger rates down to a
stellar mass ratio of about 1:30. The relation explicitly accounts for the
dependence on redshift (or time), on pair separation, and on mass of the two
galaxies in a pair. With this relation, one can easily obtain the mean merger
timescale for a close pair of galaxies. The use of virial masses, instead of
stellar masses, is motivated by the fact that the dynamical friction time scale
is mainly determined by the dark matter surrounding central and satellite
galaxies. This fact can also minimize the error induced by uncertainties in
modeling star formation in the simulation. Since the virial mass can be read
from the well-established relation between the virial masses and the stellar
masses in observation, our scaling relation can be easily applied to
observations to obtain the merger rate and merger time scale. For major merger
pairs (1:1-1:4) of galaxies above a stellar mass of 4*10^10 M_sun/h at z=0.1,
it takes about 0.31 Gyr to merge for pairs within a projected distance of 20
kpc/h with stellar mass ratio of 1:1, while the time taken goes up to 1.6 Gyr
for mergers with stellar mass ratio of 1:4. Our results indicate that a single
timescale usually used in literature is not accurate to describe mergers with
the stellar mass ratio spanning even a narrow range from 1:1 to 1:4.


abstract:
  Bound states of the generalized spiked harmonic oscillator potential are
calculated accurately by using the generalized pseudospectral method. Energy
eigenvalues, various expectation values, radial densities are obtained through
a nonuniform, optimal spatial discretization of the radial Schr\"odinger
equation efficiently. Ground and excited states corresponding to arbitrary
values of $n$ and $\ell$ are reported for potential parameters covering a wide
range of interaction. Both weak and strong coupling is considered. The effect
of potential parameters on eigenvalues and densities are discussed. Almost all
of the results are reported here for the first time, which could be useful for
future studies.


title: Power efficient carry propagate adder

abstract:
  Here we describe the design details and performance of proposed Carry
Propagate Adder based on GDI technique. GDI technique is power efficient
technique for designing digital circuit that consumes less power as compare to
most commonly used CMOS technique. GDI also has an advantage of minimum
propagation delay, minimum area required and less complexity for designing any
digital circuit. We designed Carry Propagate Adder using GDI technique and
compared its performance with CMOS technique in terms of area, delay and power
dissipation. Circuit designed using CADENCE EDA tool and simulated using
SPECTRE VIRTUOSO tool at 0.18m technology. Comparative performance result shows
that Carry Propagate Adder using GDI technique dissipated 55.6% less power as
compare to Carry Propagate Adder using CMOS technique.


title:
Challenges of Critical and Emancipatory Design Science Research: The
  Design of 'Possible Worlds' as Response

abstract:
  Popper's (1967) 'piecemeal social change' is an approach manifesting itself
in science as critical and emancipatory (C&E) research. It is concerned with
incrementally removing manifested inequalities to achieve a 'better' world.
Although design science research in information systems seems to be a prime
candidate for such endeavors, respective projects are clearly underrepresented.
This position paper argues that this is due to the demand of justifying
research ex post by an evaluation in practical settings. From the perspective
of C&E research it is questionable if powerful actors grant access to their
organization and support projects which ultimately challenge their position. It
is suggested that theory development based on a synthesis of justificatory
knowledge is a complementary approach that allows designing realizable
responses to C&E issues---the design of 'possible worlds' (Lewis, 1986) as
basis for C&E design science research.


title:
Optimizing a variable-rate diffusion to hit an infinitesimal target at a
  set time

abstract:
  I consider a stochastic optimization problem for a time-changed Bessel
process whose diffusion rate is constrained to be between two positive values
$r_{1}<r_{2}$. The problem is to find an optimal adapted strategy for the
choice of diffusion rate in order to maximize the chance of hitting an
infinitesimal region around the origin at a set time in the future. More
precisely, the parameter associated with "the chance of hitting the origin" is
the exponent for a singularity induced at the origin of the final time
probability density. I show that the optimal exponent solves a transcendental
equation depending on the ratio $\frac{r_{2}}{r_{1}}$ and the dimension of the
Bessel process.


title:
Second order ODE's cubic in the first order derivative with
  2-dimensional symmetry algebra

abstract:
  We describe the second order ODE's cubic in the first order derivative with
2-dimensional symmetry algebra. We show that there exist only eight different
types of them. We also construct the easily verifiable Equivalence Criterion
for every type of equations analogous to Linearization Criterion of S. Lie.


title:
Centrality and Transverse Momentum Dependencies of Minijets and Hadrons
  in Au-Au Collisions

abstract:
  In the study of hadron production in Au-Au collisions at RHIC minijets play
an important role in generating shower partons in the intermediate \ppt\
region. Momentum degradation of the hard and semihard partons as they traverse
the inhomogeneous medium at various azimuthal angles results in a complicated
convolution of geometrical, nuclear and dynamical factors that cannot usually
be described in a transparent way. In this work a compact formula is found that
represents the inclusive distributions of minijets of any parton type at the
surface of the medium for any collision centrality. They take into account the
contributions from all initiating partons created at any point in the medium.
By comparing with the case of no energy loss, a ratio has been determined that
is analogous to the nuclear modification factor for minijets. Phenomenological
reality of such distributions is examined by calculating the hadronization of
the minijets in the recombination model. Good fits of the data on pion, kaon
and proton production throughout the intermediate \ppt\ region have been
obtained by adjusting the parameters controlling the magnitude of the thermal
partons and the degradation rates of the semihard partons. The result gives
support to the minijet spectra at any centrality on the one hand, and the
hadronization procedure used on the other. An important property made manifest
in this study is that quarks and gluons must not lose energy in the same way
because the partons form mesons and baryons differently by recombination and
the momenta of quarks and gluons must be degraded at different rates in order
to reproduce the experimental pion and proton spectra. This is a feature that
renders invalid the notion of parton-hadron duality or other hadronization
schemes based on similar ideas.


title: Revealing missing parts of the interactome

abstract:
  Protein interaction networks (PINs) are often used to "learn" new biological
function from their topology. Since current PINs are noisy, their computational
de-noising via link prediction (LP) could improve the learning accuracy. LP
uses the existing PIN topology to predict missing and spurious links. Many of
existing LP methods rely on shared immediate neighborhoods of the nodes to be
linked. As such, they have limitations. Thus, in order to comprehensively study
what are the topological properties of nodes in PINs that dictate whether the
nodes should be linked, we had to introduce novel sensitive LP measures that
overcome the limitations of the existing methods.
  We systematically evaluate the new and existing LP measures by introducing
"synthetic" noise to PINs and measuring how well the different measures
reconstruct the original PINs. Our main findings are: 1) LP measures that favor
nodes which are both "topologically similar" and have large shared extended
neighborhoods are superior; 2) using more network topology often though not
always improves LP accuracy; and 3) our new LP measures are superior to the
existing measures. After evaluating the different methods, we use them to
de-noise PINs. Importantly, we manage to improve biological correctness of the
PINs by de-noising them, with respect to "enrichment" of the predicted
interactions in Gene Ontology terms. Furthermore, we validate a statistically
significant portion of the predicted interactions in independent, external PIN
data sources.
  Software executables are freely available upon request.


title: Review of axino dark matter

abstract:
  We review the status of axino dark matter. Two hierarchy problems, the strong
CP problem and the gauge hierarchy problem, have led to introducing into
particle physics a spontaneously broken global Peccei-Quinn symmetry and a
softly broken supersymmetry, respectively. Combining them implies the presence
of not only an axion, but also of its scalar component, saxion, and their
fermionic partner, axino. Among these, the axion and the axino are attractive
dark matter candidates. Various possibilities for the axino as dark matter are
discussed.


title:
Shot-to-shot spectrally-resolved characterization of
  continuous-wave-triggered supercontinuum near 1 um

abstract:
  We demonstrate shot-to-shot (at a rate of 20 MHz), broadband (>200 nm),
spectrally-resolved (spectral resolution of 0.2 nm) statistical
characterization of continuous-wave-triggered supercontinuum in the 1 um
regime, enabled by optical time stretch.


title:
Universal truncation error upper bounds in irregular sampling
  restoration

abstract:
  Universal (pointwise uniform and time shifted) truncation error upper bounds
are presented in Whittaker--Kotel'nikov--Shannon (WKS) sampling restoration sum
for Bernstein function class $B_{\pi,d}^q\,,\ q \ge 1,$ $d\in \mathbb N\,,$
when the sampled functions decay rate is unknown. The case of multidimensional
irregular sampling is discussed.


title:
Spin injection from topological insulator tunnel-coupled to metallic
  leads

abstract:
  We study theoretically helical edge states of 2D and 3D topological
insulators (TI) tunnel-coupled to metal leads and show that their transport
properties are strongly affected by contacts as the latter play a role of a
heat bath and induce damping and relaxation of electrons in the helical states
of TI. A simple structure that produces a pure spin current in the external
circuit is proposed. The current and spin current delivered to the external
circuit depend on relation between characteristic lengths: damping length due
to tunneling, contact length and, in case of 3D TI, mean free path and spin
relaxation length caused by momentum scattering. If the damping length due to
tunneling is the smallest one, then the electric and spin currents are
proportional to the conductance quantum in 2D TI, and to the conductance
quantum multiplied by the ratio of the contact width to the Fermi wavelength in
3D TI.


title: Singular Behavior At The Edge of Laughlin States

abstract:
  A distinguishing feature of fractional quantum Hall (FQH) states is a
singular behavior of equilibrium densities at boundaries. In contrast to states
at integer filling fraction, such quantum liquids posses an additional dipole
moment localized near edges. It enters observable quantities such as universal
dispersion of edge states and Lorentz shear stress. For a Laughlin state, this
behavior is seen as a peak, or overshoot, in the single particle density near
the edge, reflecting a general tendency of electrons in FQH states to cluster
near edges. We compute the singular edge behavior of the one particle density
by a perturbative expansion carried out around a completely filled Landau
level. This correction is shown to fully capture the dipole moment and the
major features of the overshoot observed numerically. Furthermore, it exhibits
the Stokes phenomenon with the Stokes line at the boundary of the droplet,
decaying like a Gaussian inside and outside the liquid with different decay
lengths. In the limit of vanishing magnetic length the shape the overshoot is a
singular double layer with a capacity that is a universal function of the
filling fraction. Finally, we derive the edge dipole moment of Pfaffian FQH
states. The result suggests an explicit connection between the magnitude of the
dipole moment and the bulk odd viscosity.


title: Universality and thermalization in the Unruh Effect

abstract:
  We explore the effects of different boundary conditions and coupling schemes
on the response of a particle detector undergoing uniform acceleration in
optical cavities. We analyze the thermalization properties of the accelerated
detector via non-perturbative calculations. We prove non-perturbatively that if
the switching process is smooth enough, the detector thermalizes to the Unruh
temperature regardless of the boundary conditions and the form of the coupling
considered.


title: Opinion Mining and Analysis: A survey

abstract:
  The current research is focusing on the area of Opinion Mining also called as
sentiment analysis due to sheer volume of opinion rich web resources such as
discussion forums, review sites and blogs are available in digital form. One
important problem in sentiment analysis of product reviews is to produce
summary of opinions based on product features. We have surveyed and analyzed in
this paper, various techniques that have been developed for the key tasks of
opinion mining. We have provided an overall picture of what is involved in
developing a software system for opinion mining on the basis of our survey and
analysis.


title: Unsupervised Gene Expression Data using Enhanced Clustering Method

abstract:
  Microarrays are made it possible to simultaneously monitor the expression
profiles of thousands of genes under various experimental conditions.
Identification of co-expressed genes and coherent patterns is the central goal
in microarray or gene expression data analysis and is an important task in
bioinformatics research. Feature selection is a process to select features
which are more informative. It is one of the important steps in knowledge
discovery. The problem is that not all features are important. Some of the
features may be redundant, and others may be irrelevant and noisy. In this work
the unsupervised Gene selection method and Enhanced Center Initialization
Algorithm (ECIA) with K-Means algorithms have been applied for clustering of
Gene Expression Data. This proposed clustering algorithm overcomes the
drawbacks in terms of specifying the optimal number of clusters and
initialization of good cluster centroids. Gene Expression Data show that could
identify compact clusters with performs well in terms of the Silhouette
Coefficients cluster measure.


title:
On the Quiver Presentation of the Descent Algebra of the Hyperoctahedral
  Group

abstract:
  In a recent article we introduced a mechanism for producing a presentation of
the descent algebra of the symmetric group as a quiver with relations, the
mechanism arising from a new construction of the descent algebra as a
homomorphic image of an algebra of binary forests. Here we extend the method to
construct a similar presentation of the descent algebra of the hyperoctahedral
group, providing a simple proof of the known formula for the quiver of this
algebra and a straightforward method for calculating the relations.


title:
On the Accuracy of van der Waals Inclusive Density-Functional Theory
  Exchange-Correlation Functionals for Ice at Ambient and High Pressures

abstract:
  Density-functional theory (DFT) has been widely used to study water and ice
for at least 20 years. However, the reliability of different DFT
exchange-correlation (xc) functionals for water remains a matter of
considerable debate. This is particularly true in light of the recent
development of DFT based methods that account for van der Waals (vdW)
dispersion forces. Here, we report a detailed study with several xc functionals
(semi-local, hybrid, and vdW inclusive approaches) on ice Ih and six proton
ordered phases of ice. Consistent with our previous study [Phys. Rev. Lett.
107, 185701 (2011)] which showed that vdW forces become increasingly important
at high pressures, we find here that all vdW inclusive methods considered
improve the relative energies and transition pressures of the high-pressure ice
phases compared to those obtained with semi-local or hybrid xc functionals.
However, we also find that significant discrepancies between experiment and the
vdW inclusive approaches remain in the cohesive properties of the various
phases, causing certain phases to be absent from the phase diagram. Therefore,
room for improvement in the description of water at ambient and high pressures
remains and we suggest that because of the stern test the high pressure ice
phases pose they should be used in future benchmark studies of simulation
methods for water.

categories: cond-mat.mtrl-sci cond-mat.other cond-mat.soft physics.chem-ph physics.comp-ph


title: Non-modal linear stability of the Schwarzschild black hole

abstract:
  A proof is given that the space $\L$ of solutions of the linearized vacuum
Einstein's equation around a Schwarzschild black hole is parameterized by two
scalar fields which are gauge invariant combinations of perturbed algebraic and
differential invariants of the Weyl tensor, and encode the information on the
odd (-) and even (+) sectors $\L_{\pm}$ These fields measure the distortion of
the geometry caused by a generic perturbation, and are shown to be pointwise
bounded on the outer region $r \geq 2M$.


title: The Flow Fingerprinting Game

abstract:
  Linking two network flows that have the same source is essential in intrusion
detection or in tracing anonymous connections. To improve the performance of
this process, the flow can be modified (fingerprinted) to make it more
distinguishable. However, an adversary located in the middle can modify the
flow to impair the correlation by delaying the packets or introducing dummy
traffic.
  We introduce a game-theoretic framework for this problem, that is used to
derive the Nash Equilibrium. As obtaining the optimal adversary delays
distribution is intractable, some approximations are done. We study the
concrete example where these delays follow a truncated Gaussian distribution.
We also compare the optimal strategies with other fingerprinting schemes. The
results are useful for understanding the limits of flow correlation based on
packet timings under an active attacker.


title:
Generalized Browder's theorem for tensor product and elementary
  operators

abstract:
  The transfer property for the generalized Browder's theorem both of the
tensor product and of the left-right multiplication operator will be
characterized in terms of the $B$-Weyl spectrum inclusion. In addition, the
isolated points of these two classes of operators will be fully characterized.


title: Similarity of Cowen-Douglas operators to the backward Dirichlet shift

abstract:
  We show that the same similarity characterization obtained for Cowen-Douglas
operators to the backward shift operators on reproducing kernel Hilbert spaces
with analytic kernels can be used to describe similarity in the Dirichlet space
setting. As in previous proofs, a model theorem that allows one to get the
eigenvector bundle structure of the operator plays a crucial role.


title:
BCVEGPY and GENXICC for the hadronic production of the doubly heavy
  mesons and baryons

abstract:
  Doubly heavy mesons and baryons provide a good platform for testing pQCD. Two
generators BCVEGPY and GENXICC for simulating the hadronic production of the
doubly heavy mesons and baryons have been developed in recent years. In this
talk, we present their main idea and their recent progresses. The dominant
gluon-gluon fusion mechanism programmed in those two generators are written
based on the improved helicity amplitude approach, in which the hard scattering
amplitude are dealt with directly at the amplitude level and the numerical
efficiency are greatly improved by properly decomposing the Feynman diagrams
and by fully applying the symmetries among them. Moreover, in comparison to the
previous versions, we have updated the programs in order to generate the
unweighted meson or baryon events much more effectively within various
simulation environments. The generators can be conveniently imported into
PYTHIA to do further hadronization and decay simulation.


title:
Cyclic Length in the Tame Brauer Group of the Function Field of a p-Adic
  Curve

abstract:
  Let $F$ be the function field of a smooth curve over the $p$-adic number
field $\Q_p$. We show that for each prime-to-$p$ number $n$ the $n$-torsion
subgroup $\H^2(F,\mu_n)={}_n\Br(F)$ is generated by $\Z/n$-cyclic classes; in
fact the $\Z/n$-length is equal to two. It follows that the Brauer dimension of
$F$ is two (first proved in \cite{Sa97}), and any $F$-division algebra of
period $n$ and index $n^2$ is decomposable.


title: Universal truncation error upper bounds in sampling restoration

abstract:
  Universal (pointwise uniform and time shifted) truncation error upper bounds
are presented for the Whittaker--Kotel'nikov--Shannon (WKS) sampling
restoration sum for Bernstein function classes $B_{\pi,d}^q,\, q>1,\, d\in
\mathbb N$, when the decay rate of the sampled functions is unknown. The case
of regular sampling is discussed. Extremal properties of related series of sinc
functions are investigated.


title:
Strong coupling of Jahn-Teller distortion to oxygen-octahedron rotation
  and functional properties in epitaxially-strained orthorhombic LaMnO$_3$

abstract:
  First-principles calculations reveal a large cooperative coupling of
Jahn-Teller (JT) distortion to oxygen-octahedron rotations in perovskite
LaMnO$_3$. The combination of the two distortions is responsible for
stabilizing the strongly orthorhombic $A$-AFM insulating ($I$) $Pbnm$ ground
state relative to a metallic ferromagnetic (FM-$M$) phase. However, epitaxial
strain due to coherent matching to a crystalline substrate can change the
relative stability of the two states. In particular, coherent matching to a
square-lattice substrate favors the less orthorhombic FM-$M$ phase, with the
$A$-AFM phase stabilized at higher values of tensile epitaxial strain due to
its larger volume per formula unit, resulting in a coupled magnetic and
metal-insulator transition at a critical strain close to 1%. At the phase
boundary, colossal magneto-resistance is expected. Tensile epitaxial strain
enhances the JT distortion and opens the band gap in the $A$-AFM-$I$ $c$-$Pbnm$
phase, offering the opportunity for band-gap engineering. Compressive epitaxial
strain induces an orientational transition within the FM-$M$ phase from
$c$-$Pbnm$ to $ab$-$Pbnm$ with a change in the direction of the magnetic easy
axis relative to the substrate, yielding strain-controlled magnetization at the
phase boundary. The strong couplings between the JT distortion, the
oxygen-octahedron rotations and the magnetic and electronic properties, and
associated functional behavior, motivate interest in other orthorhombic $Pbnm$
perovskites with large JT distortions, which should also exhibit a rich variety
of coupled magnetic, structural and electronic phase transitions driven by
epitaxial strain.


title: Location Verification Systems in Emerging Wireless Networks

abstract:
  As location-based techniques and applications become ubiquitous in emerging
wireless networks, the verification of location information will become of
growing importance. This has led in recent years to an explosion of activity
related to location verification techniques in wireless networks, with a
specific focus on Intelligent Transport Systems (ITS) being evident. Such focus
is largely due to the mission-critical nature of vehicle location verification
within the ITS scenario. In this work we review recent research in wireless
location verification related to the vehicular network scenario. We
particularly focus on location verification systems that rely on formal
mathematical classification frameworks, showing how many systems are either
partially or fully encompassed by such frameworks.


title:
Asymptotic behaviour of functionals of cyclical long-range dependent
  random fields

abstract:
  Long-range dependent random fields with spectral densities which are
unbounded at some frequencies are investigated. We demonstrate new examples of
covariance functions which do not exhibit regular varying asymptotic behaviour
at infinity. However, variances of averaged functionals of these fields are
regularly varying. Limit theorems for weighted functionals of cyclical
long-range dependent fields are obtained. The order of normalizing constants
and relations between the weight functions and singularities in
non-degenerative asymptotics are discussed.


title:
On the stability of dust orbits in mean motion resonances with
  considered perturbation from an interstellar wind

abstract:
  Circumstellar dust particles can be captured in a mean motion resonance with
a planet and simultaneously be affected by non-gravitational effects. It is
possible to describe the secular variations of a particle orbit in the mean
motion resonance analytically using averaged resonant equations. We derive the
averaged resonant equations from the equations of motion in near-canonical
form. The secular variations of the particle orbit depending on the orientation
of the orbit in space are taken into account. The averaged resonant equations
can be derived/confirmed also from Lagrange's planetary equations. We apply the
derived theory to the case when the non-gravitational effects are the
Poynting--Robertson effect, the radial stellar wind, and an interstellar wind.
The analytical and numerical results obtained are in excellent agreement. We
found that the types of orbits correspond to libration centers of the
conservative problem. The averaged resonant equations can lead to a system of
equations which hold for stationary points in a subset of resonant variables.
Using this system we show analytically that for the considered
non-gravitational effects, all stationary points should correspond to orbits
which are stationary in interplanetary space after an averaging over a synodic
period. In an exact resonance, the stationary orbits are stable. The stability
is achieved by a periodic repetition of the evolution during the synodic
period. Numerical solutions of this system show that there are no stationary
orbits for either the exact or non-exact resonances.


title:
Variations of the telescope conjecture and Bousfield lattices for
  localized categories of spectra

abstract:
  We investigate several versions of the telescope conjecture on localized
categories of spectra, and implications between them. Generalizing the "finite
localization" construction, we show that on such categories, localizing away
from a set of strongly dualizable objects is smashing. We classify all smashing
localizations on the harmonic category, HFp-local category and I-local
category, where I is the Brown-Comenetz dual of the sphere spectrum; all are
localizations away from strongly dualizable objects, although these categories
have no nonzero compact objects. The Bousfield lattices of the harmonic,
E(n)-local, K(n)-local, HFp-local and I-local categories are described, along
with some lattice maps between them. One consequence is that in none of these
categories is there a nonzero object that squares to zero. Another is that the
HFp-local category has localizing subcategories that are not Bousfield classes.


title: Hosotani model in closed-string theory

abstract:
  The Hosotani mechanism in the closed-string theory with current algebra
symmetry is described by the (old covariant) operator method. We compare the
gauge symmetry breaking mechanism in a string theory which contains SU(2)
symmetry originated from current algebra with the one in an equivalent
compactified closed-string theory. We also investigate the difference between
the Hosotani mechanism and the Higgs mechanism in closed-string theories by
calculation of a four-point amplitude of `Higgs' bosons at tree level.


title: Random Walks in I.I.D. Random Environment on Cayley Trees

abstract:
  We consider the random walk in an \emph{i.i.d.} random environment on the
infinite $d$-regular tree for $d \geq 3$. We consider the tree as a Cayley
graph of free product of finitely many copies of $\Zbold$ and $\Zbold_2$ and
define the i.i.d. environment as invariant under the action of this group.
Under a mild non-degeneracy assumption we show that the walk is always
transient.


title: Study on the frequency tuning of half-wave resonator at IMP

abstract:
  A 162.5 MHz superconducting half-wave resonator (HWR) with geometry beta of
0.09 is being developed for Injector II of China Accelerator Driven
Sub-critical System (CADS) Project at the Institute of Modern Physics (IMP).
The HWR section composed of 16 HWR cavities will accelerate the proton beam
from 2.1 MeV to 10 MeV. The RF and mechanical coupled analysis are essential in
geometry design in order to predict the deformation of the cavity walls and the
frequency shift caused by the deformation. In this paper, the detuning caused
by both bath helium pressure and Lorentz force is analysed and a tuning system
has been investigated and designed to compensate the detuning by deforming the
cavity along the beam axis. The simulations performed with ANSYS code show that
the tuning system can adjust and compensate the frequency drift due to external
vibrations and helium pressure fluctuation during operation.


title:
Modeling of Nonlinear Dynamic Systems with Volterra Polynomials:
  Elements of Theory and Applications

abstract:
  The paper presents a review of the studies that were conducted at Energy
Systems Institute (ESI) SB RAS in the field of mathematical modeling of
nonlinear input-output dynamic systems with Volterra polynomials. The first
part presents an original approach to identification of the Volterra kernels.
The approach is based on setting special multiparameter families of piecewise
constant test input signals. It also includes a description of the respective
software; presents illustrative calculations on the example of a reference
dynamic system as well as results of computer modeling of real heat exchange
processes. The second part of the review is devoted to the Volterra polynomial
equations of the first kind. Studies of such equations were pioneered and have
been carried out in the past decade by the laboratory of ill-posed problems at
ESI SB RAS. A special focus in the paper is made on the importance of the
Lambert function for the theory of these equations.


title: Comparative Study on Agile software development methodologies

abstract:
  Today-s business environment is very much dynamic, and organisations are
constantly changing their software requirements to adjust with new environment.
They also demand for fast delivery of software products as well as for
accepting changing requirements. In this aspect, traditional plan-driven
developments fail to meet up these requirements. Though traditional software
development methodologies, such as life cycle-based structured and object
oriented approaches, continue to dominate the systems development few decades
and much research has done in traditional methodologies, Agile software
development brings its own set of novel challenges that must be addressed to
satisfy the customer through early and continuous delivery of the valuable
software. It is a set of software development methods based on iterative and
incremental development process, where requirements and development evolve
through collaboration between self-organizing, cross-functional teams that
allows rapid delivery of high quality software to meet customer needs and also
accommodate changes in the requirements. In this paper, we significantly
identify and describe the major factors, that Agile development approach
improves software development process to meet the rapid changing business
environments. We also provide a brief comparison of agile development
methodologies with traditional systems development methodologies, and discuss
current state of adopting agile methodologies. We speculate that from the need
to satisfy the customer through early and continuous delivery of the valuable
software, Agile software development is emerged as an alternative to
traditional plan-based software development methods. The purpose of this paper,
is to provide an in-depth understanding, the major benefits of agile
development approach to software development industry, as well as provide a
comparison study report of ASDM over TSDM.


title:
Study of Conduction Cooling Effects in Long Aspect Ratio
  Penning-Malmberg Micro-Traps

abstract:
  A first order perturbation with respect to velocity has been employed to find
the frictional damping force imposed on a single moving charge due to a
perturbative electric field, inside a long circular cylindrical trap. We find
that the electric field provides a cooling effect, has a tensorial relationship
with the velocity of the charge. A mathematical expression for the tensor field
has been derived and numerically estimated. The corresponding drag forces for a
charge moving close to the wall in a cylindrical geometry asymptotically
approaches the results for a flat surface geometry calculated in the
literature. Many particle conduction cooling power dissipation is formulated
using the single particle analysis. Also the cooling rate for a weakly
interacting ensemble is estimated. It is suggested that a pre-trap section with
relatively high electrical resistivity can be employed to cool down low density
ensembles of electrons/positrons before being injected into the trap. For a
micro-trap with tens of thousands of micro-tubes, hundreds of thousands of
particles can be cooled down in each cooling cycle. For example, tens of
particles per micro-tube in a $5 cm$ long pre-trap section with the resistivity
of $0.46 \Omega m$ and the micro-tubes of radius $50 \mu m$ can be cooled down
with the time constant of $106\mu s$.


title:
A combination of transcriptional and microRNA regulation improves the
  stability of the relative concentrations of target genes

abstract:
  It is well known that, under suitable conditions, microRNAs are able to fine
tune the relative concentration of their targets to any desired value. We show
that this function is particularly effective when one of the targets is a
Transcription Factor (TF) which regulates the other targets. This combination
defines a new class of feed-forward loops (FFLs) in which the microRNA plays
the role of master regulator. Using both deterministic and stochastic equations
we show that these FFLs are indeed able not only to fine-tune the TF/target
ratio to any desired value as a function of the miRNA concentration but also,
thanks to the peculiar topology of the circuit, to ensures the stability of
this ratio against stochastic fluctuations. These two effects are due to the
interplay between the direct transcriptional regulation and the indirect
TF/Target interaction due to competition of TF and target for miRNA binding
(the so called "sponge effect"). We then perform a genome wide search of these
FFLs in the human regulatory network and show that they are characterizedby a
very peculiar enrichment pattern. In particular they are strongly enriched in
all the situations in which the TF and its target have to be precisely kept at
the same concentration notwithstanding the environmental noise. As an example
we discuss the FFL involving E2F1 as Transcription Factor, RB1 as target and
miR-17 family as master regulator. These FFLs ensure a tight control of the
E2F/RB ratio which in turns ensures the stability of the transition from the
G0/G1 to the S phase in quiescent cells.


title: Black holes in Lorentz-violating gravity theories

abstract:
  Lorentz-symmetry and the notion of light cones play a central role in the
definition of horizons and the existence of black holes. Current observations
provide strong indications that astrophysical black holes do exist in Nature.
Here we explore what happens to the notion of a black hole in gravity theories
where local Lorentz symmetry is violated, and discuss the relevant
astrophysical implications. Einstein-aether theory and Horava gravity are used
as the theoretical background for addressing this question. We review earlier
results about static, spherically symmetric black holes, which demonstrate that
in Lorentz-violating theories there can be a new type of horizon and, hence, a
new notion of black hole. We also present both known and new results on slowly
rotating black holes in these theories, which provide insights on how generic
these new horizons are. Finally, we discuss the differences between black holes
in Lorentz-violating theories and in General Relativity, and assess to what
extent they can be probed with present and future observations.


title: Low-complexity Multiclass Encryption by Compressed Sensing

abstract:
  The idea that compressed sensing may be used to encrypt information from
unauthorised receivers has already been envisioned, but never explored in depth
since its security may seem compromised by the linearity of its encoding
process. In this paper we apply this simple encoding to define a general
private-key encryption scheme in which a transmitter distributes the same
encoded measurements to receivers of different classes, which are provided
partially corrupted encoding matrices and are thus allowed to decode the
acquired signal at provably different levels of recovery quality.
  The security properties of this scheme are thoroughly analysed: firstly, the
properties of our multiclass encryption are theoretically investigated by
deriving performance bounds on the recovery quality attained by lower-class
receivers with respect to high-class ones. Then we perform a statistical
analysis of the measurements to show that, although not perfectly secure,
compressed sensing grants some level of security that comes at almost-zero cost
and thus may benefit resource-limited applications.
  In addition to this we report some exemplary applications of multiclass
encryption by compressed sensing of speech signals, electrocardiographic tracks
and images, in which quality degradation is quantified as the impossibility of
some feature extraction algorithms to obtain sensitive information from
suitably degraded signal recoveries.


title: Efficient method for controlling the spatial coherence of a laser

abstract:
  An efficient method to tune the spatial coherence of a degenerate laser over
a broad range with minimum variation in the total output power is presented. It
is based on varying the diameter of a spatial filter inside the laser cavity.
The number of lasing modes supported by the degenerate laser can be controlled
from 1 to 320,000, with less than a 50% change in the total output power. We
show that a degenerate laser designed for low spatial coherence can be used as
an illumination source for speckle-free microscopy that is 9 orders of
magnitude brighter than conventional thermal light.


title:
Many-body study of a quantum point contact in the fractional quantum
  Hall regime at v=5/2

abstract:
  We study a quantum point contact in the fractional quantum Hall regime at
Landau level filling factors 1/3 and 5/2. By using exact diagonalizations in
the cylinder geometry we identify the edge modes in the presence of a parabolic
confining potential. By changing the sign of the potential we can access both
the tunneling through the bulk of the fluid and the tunneling between spatially
separated droplets. This geometry is realized in the quantum point contact
geometry for two-dimensional electron gases. In the case of the model
Moore-Read Pfaffian state at filling factor 5/2 we identify the conformal
towers of many-body eigenstates including the non-Abelian sector. By a
Monte-Carlo technique we compute the various scaling exponents that
characterize the edge modes. In the case of hard-core interactions whose ground
states are exact model wavefunction we find equality of neutral and charged
velocities for the Pfaffian state both bosonic and fermionic.


title:
Renormalized energy equidistribution and local charge balance in 2D
  Coulomb systems

abstract:
  We consider two related problems: the first is the minimization of the
"Coulomb renormalized energy" of Sandier-Serfaty, which corresponds to the
total Coulomb interaction of point charges in a uniform neutralizing background
(or rather variants of it). The second corresponds to the minimization of the
Hamiltonian of a two-dimensional "Coulomb gas" or "one-component plasma", a
system of n point charges with Coulomb pair interaction, in a confining
potential (minimizers of this energy also correspond to "weighted Fekete
sets"). In both cases we investigate the microscopic structure of minimizers,
i.e. at the scale corresponding to the interparticle distance. We show that in
any large enough microscopic set, the value of the energy and the number of
points are "rigid" and completely determined by the macroscopic density of
points. In other words, points and energy are "equidistributed" in space
(modulo appropriate scalings). The number of points in a ball is in particular
known up to an error proportional to the radius of the ball. We also prove a
result on the maximal and minimal distances between points. Our approach
involves fully exploiting the minimality by reducing to minimization problems
with fixed boundary conditions posed on smaller subsets.


title: Connections between Quasi-periodicity and Modulation in Pulsating Stars

abstract:
  The observations of the photometric space telescopes CoRoT and Kepler show
numerous Blazhko RR Lyrae stars which have non-repetitive modulation cycles.
The phenomenon can be explained by multi-periodic, stochastic or chaotic
processes. From a mathematical point of view, almost periodic functions
describe all of them. We assumed band-limited almost periodic functions either
for the light curves of the main pulsation or for the modulation functions. The
resulting light curves can generally be described analytically and it can also
be examined by numerical simulations. This presentation is a part of our
systematic study on the modulation of pulsating stars (Benko et al. 2009, 2011,
2012).


title: Markov games with frequent actions and incomplete information

abstract:
  We study a two-player, zero-sum, stochastic game with incomplete information
on one side in which the players are allowed to play more and more frequently.
The informed player observes the realization of a Markov chain on which the
payoffs depend, while the non-informed player only observes his opponent's
actions. We show the existence of a limit value as the time span between two
consecutive stages vanishes; this value is characterized through an auxiliary
optimization problem and as the solution of an Hamilton-Jacobi equation.


title: Precision measurements in nuclear {\beta}-decay with LPCTrap

abstract:
  The experimental achievements and the current program with the LPCTrap device
installed at the LIRAT beam line of the SPIRAL1-GANIL facility are presented.
The device is dedicated to the study of the weak interaction at low energy by
means of precise measurements of the {\beta}-{\nu} angular correlation
parameter. Technical aspects as well as the main results are reviewed. The
future program with new available beams is briefly discussed.


title: Three-dimensional emission from organic Fabry-Perot microlasers

abstract:
  We measured the far-field emission patterns in three dimensions of flat
organic dye microlasers using a solid angle scanner. Polymer-based
microcavities of ribbon shape (i.e., Fabry-Perot type) were investigated. Out
of plane emission from the cavities was observed, with significant differences
for the two cases of resonators either fully supported by the substrate or
sustained by a pedestal. In both cases, the emission diagrams are accounted for
by a model combining diffraction at the cavity edges and reflections from the
substrate.


title:
Kato perturbation expansion in classical mechanics and an explicit
  expression for a Deprit generator

abstract:
  This work explores the structure of Poincare-Lindstedt perturbation series in
Deprit operator formalism and establishes its connection to Kato resolvent
expansion. A discussion of invariant definitions for averaging and integrating
perturbation operators and their canonical identities reveals a regular pattern
in a Deprit generator. The pattern was explained using Kato series and the
relation of perturbation operators to Laurent coefficients for the resolvent of
Liouville operator.
  This purely canonical approach systematizes the series and leads to the
explicit expression for the Deprit generator in any perturbation order: \[G = -
\hat{\mathsf S}_H H_i.\] Here, $\hat{\mathsf S}_H$ is the partial
pseudo-inverse of the perturbed Liouville operator. Corresponding Kato series
provides a reasonably effective computational algorithm.
  The canonical connection of perturbed and unperturbed averaging operators
allows for a description of ambiguities in the generator and transformed
Hamiltonian, while Gustavson integrals turn out to be insensitive to
normalization style. Non-perturbative examples are used for illustration.


title: Noisy classification with boundary assumptions

abstract:
  We address the problem of classification when data are collected from two
samples with measurement errors. This problem turns to be an inverse problem
and requires a specific treatment. In this context, we investigate the minimax
rates of convergence using both a margin assumption, and a smoothness condition
on the boundary of the set associated to the Bayes classifier. We establish
lower and upper bounds (based on a deconvolution classifier) on these rates.


title: Crackling vs. continuum-like dynamics in brittle failure

abstract:
  We study how the loading rate, specimen geometry and microstructural texture
select the dynamics of a crack moving through an heterogeneous elastic material
in the quasi-static approximation. We find a transition, fully controlled by
two dimensionless variables, between dynamics ruled by continuum fracture
mechanics and crackling dynamics. Selection of the latter by the loading,
microstructure and specimen parameters is formulated in terms of scaling laws
on the power spectrum of crack velocity. This analysis defines the experimental
conditions required to observe crackling in fracture. Beyond failure problems,
the results extend to a variety of situations described by models of the same
universality class, e.g. the dynamics in wetting or of domain walls in
amorphous ferromagnets.


title: On the number of rational points on Prym varieties over finite fields

abstract:
  We give upper and lower bounds for the number of rational points on Prym
varieties over finite fields. Moreover, we determine the exact maximum and
minimum number of rational points on Prym varieties of dimension 2.


title: Fractional decay bounds for nonlocal zero order heat equations

abstract:
  In this paper we obtain bounds for the decay rate for solutions to the
nonlocal problem $\partial_t u(t,x) = \int_{\R^n} J(x,y)[u(t,y) - u(t,x)] dy$.
Here we deal with bounded kernels $J$ but with polynomial tails, that is, we
assume a lower bound of the form $J(x,y) \geq c_1|x-y|^{-(n + 2\sigma)}$, for
$|x - y| > c_2$. Our estimates takes the form $\|u(t)\|_{L^q(\R^n)} \leq C
t^{-\frac{n}{2\sigma} (1 - \frac{1}{q})}$ for $t$ large.


title:
Numerical modeling of nonlinear acoustic waves in a tube connected with
  Helmholtz resonators

abstract:
  Acoustic wave propagation in a one-dimensional waveguide connected with
Helmholtz resonators is studied numerically. Finite amplitude waves and viscous
boundary layers are considered. The model consists of two coupled evolution
equations: a nonlinear PDE describing nonlinear acoustic waves, and a linear
ODE describing the oscillations in the Helmholtz resonators. The thermal and
viscous losses in the tube and in the necks of the resonators are modeled by
fractional derivatives. A diffusive representation is followed: the convolution
kernels are replaced by a finite number of memory variables that satisfy local
ordinary differential equations. A splitting method is then applied to the
evolution equations: their propagative part is solved using a standard TVD
scheme for hyperbolic equations, whereas their diffusive part is solved
exactly. Various strategies are examined to compute the coefficients of the
diffusive representation; finally, an optimization method is preferred to the
usual quadrature rules. The numerical model is validated by comparisons with
exact solutions. The properties of the full nonlinear solutions are
investigated numerically. In particular, the existence of acoustic solitary
waves is confirmed.


title:
The Plastic and Liquid Phases of CCl$_3$Br Studied by Molecular Dynamics
  Simulations

abstract:
  We present a molecular dynamics study of the liquid and plastic crystalline
phases of CCl$_3$Br. We investigated the short-range orientational order using
a recently developed classification method and we found that both phases behave
in a very similar way. The only differences occur at very short molecular
separations, which are shown to be very rare. The rotational dynamics was
explored using time correlation functions of the molecular bonds. We found that
the relaxation dynamics corresponds to an isotropic diffusive mode for the
liquid phase, but departs from this behavior as the temperature is decreased
and the system transitions into the plastic phase.


title:
An asymptotical method to estimate the parameters of a deteriorating
  system under condition-based maintenance

abstract:
  In this paper, we develop a new method to estimate the parameters of a
deteriorating system under perfect condition-based maintenance. This method is
based on the asymptotical behavior of the system, which is studied by using the
renewal process theory. We obtain a Central Limit Theorem (CLT in the
following) for the parameters. We compare the accuracy and the speed of the
method with the maximum likelihood one (ML method in the following) on
different examples.


title: Exact formulas for the approximation of connections and curvature

abstract:
  First we express the holonomy along a boundary curve as the integral on the
domain, of an expression which is linear in the curvature. Then we provide a
rigorous justification of the definition of curvature in Regge calculus.


title: Avalanches in 2D Dislocation Systems: Plastic Yielding is not Depinning

abstract:
  We study the properties of strain bursts (dislocation avalanches) occurring
in two-dimensional discrete dislocation dynamics models under quasistatic
stress-controlled loading. Contrary to previous suggestions, the avalanche
statistics differs fundamentally from predictions obtained for the depinning of
elastic manifolds in quenched random media. Instead, we find an exponent \tau
=1 of the power-law distribution of slip or released energy, with a cut-off
that increases exponentially with the applied stress and diverges with system
size at all stresses. These observations demonstrate that the avalanche
dynamics of 2D dislocation systems is scale-free at every applied stress and,
therefore, can not be envisaged in terms of critical behavior associated with a
depinning transition.


title:
The dissipative phase transition in a pair of coupled noisy two-level
  systems

abstract:
  We study the renormalization group (RG) equations of a pair of spin-boson
systems coupled in the z-direction with each other. Each spin is coupled to a
different bath of harmonic oscillators. We introduce a systematic adiabatic RG,
which generalizes the first-order adiabatic renormalization previously used for
the single spin-boson model, and we obtain the flow equations for the tunneling
constant, the dissipation strength and the inter-spin coupling up to third
order in the tunneling. If one of the two spins is treated as a constant
magnetization the other spin is described by a biased spin-boson Hamiltonian.
In this case the RG equations we find coincide with the ones obtained via a
mapping to a long-range Ising chain. If the whole Ohmic two-spin system is
considered the Kosterlitz-Thouless phase transition is replaced by a
second-order phase transition. In the case of a sub-Ohmic bath our approach
predicts that the two-spin system is always localized.


title: Purity for graded potentials and quantum cluster positivity

abstract:
  Consider a smooth quasiprojective variety X equipped with a C*-action, and a
regular function f: X -> C which is C*-equivariant with respect to a positive
weight action on the base. We prove the purity of the mixed Hodge structure and
the hard Lefschetz theorem on the cohomology of the vanishing cycle complex of
f on proper components of the critical locus of f, generalizing a result of
Steenbrink for isolated quasi-homogeneous singularities. Building on work of
Kontsevich-Soibelman, Nagao and Efimov, we use this result to prove the quantum
positivity conjecture for cluster mutations for all quivers admitting a
positively graded nondegenerate potential. We deduce quantum positivity for all
quivers of rank at most 4; quivers with nondegenerate potential admitting a
cut; and quivers with potential associated to triangulations of surfaces with
marked points and nonempty boundary.


title: High-energy radiation damage in zirconia: modeling results

abstract:
  Zirconia is viewed as a material of exceptional resistance to amorphization
by radiation damage, and consequently proposed as a candidate to immobilize
nuclear waste and serve as an inert nuclear fuel matrix. Here, we perform
molecular dynamics simulations of radiation damage in zirconia in the range of
0.1-0.5 MeV energies with full account of electronic energy losses. We find
that the lack of amorphizability co-exists with a large number of point defects
and their clusters. These, importantly, are largely isolated from each other
and therefore represent a dilute damage that does not result in the loss of
long-range structural coherence and amorphization. We document the nature of
these defects in detail, including their sizes, distribution and morphology,
and discuss practical implications of using zirconia in intense radiation
environments.


title: Wiener measure for Heisenberg group

abstract:
  In this paper, we build Wiener measure for the path space on the Heisenberg
group by using of the heat kernel corresponding to the sub-Laplacian and give
the definition of the Wiener integral. Then we give the Feynman-Kac formula.


title:
The limit to rarefaction wave with vacuum for 1D compressible fluids
  with temperature-dependent viscosities

abstract:
  In this paper we study the zero dissipation limit of the one-dimensional full
compressible Navier-Stokes(CNS) equations with temperature-dependent viscosity
and heat-conduction coefficient. It is proved that given a rarefaction wave
with one-side vacuum state to the full compressible Euler equations, we can
construct a sequence of solutions to the full CNS equations which converge to
the above rarefaction wave with vacuum as the viscosity and the heat conduction
coefficient tend to zero. Moreover, the uniform convergence rate is obtained.
The main difficulty in our proof lies in the degeneracies of the density, the
temperature and the temperature-dependent viscosities at the vacuum region in
the zero dissipation limit.


title: Determination of the CMSSM Parameters using Neural Networks

abstract:
  In most (weakly interacting) extensions of the Standard Model the relation
mapping the parameter values onto experimentally measurable quantities can be
computed (with some uncertainties), but the inverse relation is usually not
known. In this paper we demonstrate the ability of artificial neural networks
to find this unknown relation, by determining the unknown parameters of the
constrained minimal supersymmetric extension of the Standard Model (CMSSM) from
quantities that can be measured at the LHC. We expect that the method works
also for many other new physics models. We compare its performance with the
results of a straightforward \chi^2 minimization. We simulate LHC signals at a
center of mass energy of 14 TeV at the hadron level. In this proof-of-concept
study we do not explicitly simulate Standard Model backgrounds, but apply cuts
that have been shown to enhance the signal-to-background ratio. We analyze four
different benchmark points that lie just beyond current lower limits on
superparticle masses, each of which leads to around 1000 events after cuts for
an integrated luminosity of 10 fb^{-1}. We use up to 84 observables, most of
which are counting observables; we do not attempt to directly reconstruct
(differences of) masses from kinematic edges or kinks of distributions. We
nevertheless find that m_0 and m_{1/2} can be determined reliably, with errors
as small as 1% in some cases. With 500 fb^{-1} of data tan\beta as well as A_0
can also be determined quite accurately. For comparable computational effort
the \chi^2 minimization yielded much worse results.


title:
From Discrete Time Quantum Walk to Continuous Time Quantum Walk in Limit
  Distribution

abstract:
  The discrete time quantum walk defined as a quantum-mechanical analogue of
the discrete time random walk have recently been attracted from various and
interdisciplinary fields. In this review, the weak limit theorem, that is, the
asymptotic behavior, of the one-dimensional discrete time quantum walk is
analytically shown. From the limit distribution of the discrete time quantum
walk, the discrete time quantum walk can be taken as the quantum dynamical
simulator of some physical systems.

categories: quant-ph math-ph math.MP math.PR nlin.CG


title: Electronic effects in high-energy radiation damage in iron

abstract:
  Electronic effects are believed to be important in high--energy radiation
damage processes where high electronic temperature is expected, yet their
effects are not currently understood. Here, we perform molecular dynamics
simulations of high-energy collision cascades in $\alpha$-iron using the
coupled two-temperature molecular dynamics (2T-MD) model that incorporates both
effects of electronic stopping and electron-ion interaction. We subsequently
compare it with the model employing the electronic stopping only, and find
several interesting novel insights. The 2T-MD results in both decreased damage
production in the thermal spike and faster relaxation of the damage at short
times. Notably, the 2T-MD model gives a similar amount of the final damage at
longer times, which we interpret to be the result of two competing effects:
smaller amount of short-time damage and shorter time available for damage
recovery.


title:
Development of the Photomultiplier-Tube Readout System for the CTA Large
  Size Telescope

abstract:
  We have developed a prototype of the photomultiplier tube (PMT) readout
system for the Cherenkov Telescope Array (CTA) Large Size Telescope (LST). Two
thousand PMTs along with their readout systems are arranged on the focal plane
of each telescope, with one readout system per 7-PMT cluster. The Cherenkov
light pulses generated by the air showers are detected by the PMTs and
amplified in a compact, low noise and wide dynamic range gain block. The output
of this block is then digitized at a sampling rate of the order of GHz using
the Domino Ring Sampler DRS4, an analog memory ASIC developed at Paul Scherrer
Institute. The sampler has 1,024 capacitors per channel and four channels are
cascaded for increased depth. After a trigger is generated in the system, the
charges stored in the capacitors are digitized by an external slow sampling ADC
and then transmitted via Gigabit Ethernet. An onboard FPGA controls the DRS4,
trigger threshold, and Ethernet transfer. In addition, the control and
monitoring of the Cockcroft-Walton circuit that provides high voltage for the
7-PMT cluster are performed by the same FPGA. A prototype named Dragon has been
developed that has successfully sampled PMT signals at a rate of 2 GHz, and
generated single photoelectron spectra.


title:
Perturbative Analysis of Potential Scattering Problems in the
  Lieb-Liniger Model

abstract:
  The Lieb-Liniger model which has a weak external potential term under the
periodic boundary condition is investigated. By exploiting the Bethe states as
bases, we perform a perturbation analysis up to the first order to obtain the
shifts of eigenenergies and corresponding eigenstates which have been brought
about by the external potential. If we take a sufficiently large system, the
eigenstates can be "the Schr\"odinger's cat states". Expectation values of the
density operator taken between two Bethe states can be calculated with the aid
of the Slavnov's formula and we evaluate the influence of the many-body
interaction to the system under the external potential. The system is
insensitive to the external potential because of the many-body interaction.


title: Dynamic networks reveal key players in aging

abstract:
  Motivation: Since susceptibility to diseases increases with age, studying
aging gains importance. Analyses of gene expression or sequence data, which
have been indispensable for investigating aging, have been limited to studying
genes and their protein products in isolation, ignoring their connectivities.
However, proteins function by interacting with other proteins, and this is
exactly what biological networks (BNs) model. Thus, analyzing the proteins' BN
topologies could contribute to understanding of aging. Current methods for
analyzing systems-level BNs deal with their static representations, even though
cells are dynamic. For this reason, and because different data types can give
complementary biological insights, we integrate current static BNs with
aging-related gene expression data to construct dynamic, age-specific BNs.
Then, we apply sensitive measures of topology to the dynamic BNs to study
cellular changes with age.
  Results: While global BN topologies do not significantly change with age,
local topologies of a number of genes do. We predict such genes as
aging-related. We demonstrate credibility of our predictions by: 1) observing
significant overlap between our predicted aging-related genes and "ground
truth" aging-related genes; 2) showing that our aging-related predictions group
by functions and diseases that are different than functions and diseases of
genes that are not predicted as aging-related; 3) observing significant overlap
between functions and diseases that are enriched in our aging-related
predictions and those that are enriched in "ground truth" aging-related data;
4) providing evidence that diseases which are enriched in our aging-related
predictions are linked to human aging; and 5) validating all of our
high-scoring novel predictions via manual literature search.


title:
SInC: An accurate and fast error-model based simulator for SNPs, Indels
  and CNVs coupled with a read generator for short-read sequence data

abstract:
  We report SInC (SNV, Indel and CNV) simulator and read generator, an
open-source tool capable of simulating biological variants taking into account
a platform-specific error model. SInC is capable of simulating and generating
single- and paired-end reads with user-defined insert size with high efficiency
compared to the other existing tools. SInC, due to its multi-threaded
capability during read generation, has a low time footprint. SInC is currently
optimised to work in limited infrastructure setup and can efficiently exploit
the commonly used quad-core desktop architecture to simulate short sequence
reads with deep coverage for large genomes. Sinc can be downloaded from
https://sourceforge.net/projects/sincsimulator/.


title: A systematic approach to reductions of type-Q ABS equations

abstract:
  We present a class of reductions of M\"obius type for the lattice equations
known as Q1, Q2, and Q3 from the ABS list. The deautonomised form of one
particular reduction of Q3 is shown to exist on the $A_1^{(1)}$ surface which
belongs to the multiplicative type of rational surfaces in Sakai's
classification of Painlev\'e systems. Using the growth of degrees of iterates,
all other mappings that result from the class of reductions considered here are
shown to be linearisable. Any possible linearisations are calculated explicitly
by constructing a birational transformation defined by invariant curves in the
blown up space of initial values for each reduction.


title:
Modeling the linewidth dependence of coherent terahertz emission from
  intrinsic Josephson junction stacks in the hot-spot regime

abstract:
  Recently it has been found that, when operated at large input power, the
linewidth of terahertz radiation emitted from intrinsic Josephson junction
stacks can be as narrow as some megahertz. In this high-bias regime a hot spot
coexists with regions which are still superconducting. Surprisingly, the
linewidth was found to decrease with increasing bath temperature. We present a
simple model describing the dynamics of the stack in the presence of a hot spot
by two parallel arrays of pointlike Josephson junctions and an additional shunt
resistor in parallel. Heat diffusion is taken into account by thermally
coupling all elements to a bath at temperature T_b. We present current-voltage
characteristics of the coupled system and calculations of the linewidth of the
radiation as a function of T_b. In the presence of a spatial gradient of the
junction parameters critical current and resistance, the linewidth deceases
with increasing T_b, similar to the experimental observation.


title: Hot coronal loops associated with umbral brightenings

abstract:
  We analyzed AIA/SDO high-cadence images in all bands, HMI/SDO data, soft
X-ray images from SXI/GOES-15, and Halpha images from the GONG network. We
detected umbral brightenings that were visible in all AIA bands as well as in
Halpha. Moreover, we identified hot coronal loops that connected the
brightenings with nearby regions of opposite magnetic polarity. These loops
were initially visible in the 94 A band, subsequently in the 335 A band, and in
one case in the 211 A band. A differential emission measure analysis revealed
plasma with an average temperature of about 6.5x10^6 K. This behavior suggests
cooling of impulsively heated loops.


title: Stellarators close to quasisymmetry

abstract:
  Rotation is favorable for confinement, but a stellarator can rotate at high
speeds if and only if it is sufficiently close to quasisymmetry. This article
investigates how close it needs to be. For a magnetic field $\mathbf{B} =
\mathbf{B}_0 + \alpha \mathbf{B}_1$, where $\mathbf{B}_0$ is quasisymmetric,
$\alpha\mathbf{B}_1$ is a deviation from quasisymmetry, and $\alpha\ll 1$, the
stellarator can rotate at high velocities if $\alpha < \epsilon^{1/2}$, with
$\epsilon$ the ion Larmor radius over the characteristic variation length of
$\mathbf{B}_0$. The cases in which this result may break down are discussed. If
the stellarator is sufficiently quasisymmetric in the above sense, the rotation
profile, and equivalently, the long-wavelength radial electric field, are not
set neoclassically; instead, they can be affected by turbulent transport. Their
computation requires the $O(\epsilon^2)$ pieces of both the turbulent and the
long-wavelength components of the distribution function. This article contains
the first step towards a formulation to calculate the rotation profile by
providing the equations determining the long-wavelength components of the
$O(\epsilon^2)$ pieces.


title: Multimode optical fiber radiation modal decomposition

abstract:
  We proposed the method of the optical fiber modal decomposition of the
radiation propagating in a multimode optical fiber with a step like refractive
index profile. The field distribution at the output end of the fiber was used.
The method is based on the field decomposition by non-orthogonal modes. The
full complex expansion coefficients of the light field were calculated for
theoretical data.


title: On the codegree density of complete 3-graphs and related problems

abstract:
  Given a family of 3-graphs F its codegree threshold coex(n, F) is the largest
number d=d(n) such that there exists an n-vertex 3-graph in which every pair of
vertices is contained in at least d 3-edges but which contains no member of F
as a subgraph. The codegree density gamma(F) is the limit of coex(n,F)/(n-2) as
n tends to infinity.
  In this paper we generalise a construction of Czygrinow and Nagle to bound
below the codegree density of complete 3-graphs: for all integers s>3, the
codegree density of the complete 3-graph on s vertices K_s satisfies
gamma(K_s)\geq 1-1/(s-2).
  We also provide constructions based on Steiner triple systems which show that
if this lower bound is sharp, then we do not have stability in general. In
addition we prove bounds on the codegree density for two other infinite
families of 3-graphs.


title: Software as a Service - Common Service Bus (SAAS-CSB)

abstract:
  Software-as-a-Service (SaaS) is a form of cloud computing that relieves the
user from the concern of hardware, software installation and management. It is
an emerging business model that delivers software applications to the users
through Web-based technology. Software vendors have varying requirements and
SaaS applications most typically support such requirements. The various
applications used by unique customers in a single instance are known as
Multi-Tenancy. There would be a delay in service when the user sends the data
from multiple applications to multiple destinations and from multiple
applications to single destination due to the use of single CSB. This problem
can be overcome by using multiple CSB concepts and hence multiple senders can
efficiently send their data to multiple receivers at the same time. The
multiple clouds are monitored and managed by the SaaS-CSB portal. The idea of
SaaS-CSB Portal is to provide a single pane of glass for the user to consume
and govern any service from any cloud. Thus, SaaS-CSB application allows
companies to save their IT cost and valuable time.


title: Distillation of the two-mode squeezed state

abstract:
  We experimentally demonstrate entanglement distillation of the two mode
squeezed state. Applying the annihilation operator to both modes, we increase
the fraction of the two-photon component in the state, resulting in the
increase of both squeezing and entanglement by about 50%.


title:
Agent Based Software Testing Framework (ABSTF) for Application
  Maintenance

abstract:
  Software testing framework can be stated as the process of verifying and
validating that a computer program/application works as expected and meets the
requirements of the user. Usually testing can be done manually or using tools.
Manual testing can be time consuming and tedious, also it requires heavy
investment of human resources. Testing tools in fact have many advantages and
are widely used nowadays, but also has several disadvantages. One particular
problem is that human intervention is no longer needed. Testing tools are of
high cost and so, it cannot be used for small companies. Hence in this paper we
propose Agent based testing, which is a fast growing approach in testing field.
The proposed system (ABSTF) has to reduce the application testing moment,
easily find out bug and solve the bug by Regression Testing. Here by we are
going to use a safe efficient regression selection technique algorithm to
selectively retest the modified program. We also use Traceability relation of
completeness checking for agent oriented system, which identifies missing
elements in entire application and classifies defect in the testing moment.
With the ability of agents to act autonomously, monitoring code changes and
generating test cases for the changed version of code can be done dynamically.


title: Social Networking Site For Self Portfolio

abstract:
  Online social networking concept is a global phenomenon and there are
millions of sites which help in being connected with friends and family. This
project focuses on creating self-portfolios for the users which makes the users
engaging with their skills. The users follow the other users to interact and
communicate with them. Users can encourage the other users blogs and videos by
clicking the hit button. The functionality of this site is designed to focus on
both professional as well as academics. Each user is given a dashboard for
uploading videos and writing blogs.


title: Thompson Sampling for 1-Dimensional Exponential Family Bandits

abstract:
  Thompson Sampling has been demonstrated in many complex bandit models,
however the theoretical guarantees available for the parametric multi-armed
bandit are still limited to the Bernoulli case. Here we extend them by proving
asymptotic optimality of the algorithm using the Jeffreys prior for
1-dimensional exponential family bandits. Our proof builds on previous work,
but also makes extensive use of closed forms for Kullback-Leibler divergence
and Fisher information (and thus Jeffreys prior) available in an exponential
family. This allow us to give a finite time exponential concentration
inequality for posterior distributions on exponential families that may be of
interest in its own right. Moreover our analysis covers some distributions for
which no optimistic algorithm has yet been proposed, including heavy-tailed
exponential families.


title: Einstein's Miraculous Year

abstract:
  With each passing year, the young Albert Einstein's achievements in physics
in the year 1905 seem to be ever more miraculous. We describe why the centenary
of this remarkable year is worthy of celebration.


title:
Improving Data Security in Infrastructure Networks Based on Unipath
  Routing

abstract:
  An infrastructure network is a self-organizing network which uses Access
Point (AP) of wireless links that connecting one node with another. These nodes
can communicate without using ad hoc, instead these nodes form an arbitrary
topology (BSS/ESS) in which these nodes play the role of routers. Though the
efficiency of Infrastructure networks is high, they are highly vulnerable to
security attacks. Detecting/Preventing these attacks over the network is highly
challenging task. Many solutions are proposed to provide authentication,
confidentiality, availability, secure routing and intrusion avoidance in
infrastructure networks. Providing security in such dynamically changing
networks is a hard task. Characteristic of infrastructure network should also
be taken into consideration in order to design efficient solutions. In this
study, we focus on efficiently increasing the flow transmission confidentiality
in infrastructure networks based on multi-path routing. In order to increase
confidentiality of transmitted data, we take advantage of the existence of
multiple paths between nodes in an infrastructure network with the help of
Access Point. In this approach the original data is split into package and are
forwarded through access point. The encrypted packets are then forwarded in
different disjoint paths that exist between sender and receiver. Even if an
attacker succeeds to obtain one or more transmitted packets, the probability of
reconstructing the original message is very low.


title:
Detection of Ly\beta auto-correlations and Ly\alpha-Ly\beta
  cross-correlations in BOSS Data Release 9

abstract:
  The Lyman-$\beta$ forest refers to a region in the spectra of distant quasars
that lies between the rest-frame Lyman-$\beta$ and Lyman-$\gamma$ emissions.
The forest in this region is dominated by a combination of absorption due to
resonant Ly$\alpha$ and Ly$\beta$ scattering. When considering the 1D Ly$\beta$
forest in addition to the 1D Ly$\alpha$ forest, the full statistical
description of the data requires four 1D power spectra: Ly$\alpha$ and
Ly$\beta$ auto-power spectra and the Ly$\alpha$-Ly$\beta$ real and imaginary
cross-power spectra. We describe how these can be measured using an optimal
quadratic estimator that naturally disentangles Ly$\alpha$ and Ly$\beta$
contributions. Using a sample of approximately 60,000 quasar sight-lines from
the BOSS Data Release 9, we make the measurement of the one-dimensional power
spectrum of fluctuations due to the Ly$\beta$ resonant scattering. While we
have not corrected our measurements for resolution damping of the power and
other systematic effects carefully enough to use them for cosmological
constraints, we can robustly conclude the following: i) Ly$\beta$ power
spectrum and Ly$\alpha$-Ly$\beta$ cross spectra are detected with high
statistical significance; ii) the cross-correlation coefficient is $\approx 1$
on large scales; iii) the Ly$\beta$ measurements are contaminated by the
associated OVI absorption, which is analogous to the SiIII contamination of the
Ly$\alpha$ forest. Measurements of the Ly$\beta$ forest will allow extension of
the usable path-length for the Ly$\alpha$ measurements while allowing a better
understanding of the physics of intergalactic medium and thus more robust
cosmological constraints.


title: Mesh Improvement Methodology for 3D Volumes with non-Planar Surfaces

abstract:
  A mesh improvement methodology is pre- sented which aims to improve the
quality of the worst elements in 3D meshes with non-planar surfaces which
cannot be improved using traditional methods. A nu- merical optimisation
algorithm, which specifically tar- gets the worst elements in the mesh, but is
a smooth function of nodal positions is introduced. A method of moving nodes on
curved surfaces whilst maintaining the domain geometry and preserving mesh
volume is proposed. This is shown to be very effective at improv- ing meshes
for which traditional mesh improvers do not perform well.


title: The water supercooled regime as described by four common water models

abstract:
  The temperature scale of simple water models in general does not coincide
with the natural one. Therefore, in order to make a meaningful evaluation of
different water models a temperature rescaling is necessary. In this paper we
introduce a rescaling using the melting temperature and the temperature
corresponding to the maximum of the heat capacity to evaluate four common water
models (TIP4P-Ew, TIP4P-2005, TIP5P-Ew and Six-Sites) in the supercooled
regime. Although all the models show the same general qualitative behavior, the
TIP5P-Ew appears as the best representation of the supercooled regime when the
rescaled temperature is used. We also analyze, using thermodynamic arguments,
the critical nucleus size for ice growth. Finally, we speculate on the possible
reasons why atomistic models do not usually crystalize while the coarse grained
mW model do crystallize.


title:
Towards a full Atmospheric Calibration system for the Cherenkov
  Telescope Array

abstract:
  The current generation of Cherenkov telescopes is mainly limited in their
gamma-ray energy and flux reconstruction by uncertainties in the determination
of atmospheric parameters. The Cherenkov Telescope Array (CTA) aims to provide
high-precision data extending the duty cycle as much as possible. To reach this
goal, it is necessary to continuously and precisely monitor the atmosphere by
means of remote-sensing devices, which are able to provide altitude-resolved
and wavelength-dependent extinction factors, sensitive up to the tropopause and
higher. Raman LIDARs are currently the best suited technology to achieve this
goal with one single instrument. However, the synergy with other instruments
like radiometers, solar and stellar photometers, all-sky cameras, and possibly
radio-sondes is desirable in order to provide more precise and accurate
results, and allows for weather forecasts and now-casts. In this contribution,
we will discuss the need and features of such multifaceted atmospheric
calibration systems.


title: Fragmentation Functions measurement at COMPASS

abstract:
  Fragmentation functions represent a key ingredient to address the proton spin
structure in semi-inclusive deep-inelastic scattering and proton-proton
collisions. They can not be determined from perturbative Quantum Chromodynamics
and have to be extracted from experimental data in different processes. The
COMPASS experiment at CERN provides a large data sample and covers a wide
kinematic range for precise measurement of hadron multiplicities, directly
connected to fragmentation functions. Recent, full-differential results on pion
and kaon multiplicities are presented and discussed


title:
Superconducting gap with sign reversal between hole pockets in heavily
  hole-doped Ba1-xKxFe2As2

abstract:
  To gain insight into the unconventional superconductivity of Fe-pnictides
with no electron pockets, we measure the thermal conductivity $\kappa$ and
penetration depth $\lambda$ in the heavily hole-doped regime of
Ba$_{1-x}$K$_x$Fe$_2$As$_2$. The residual thermal conductivity $(\kappa/T)_{T
\rightarrow 0\,{\rm K}}$ and $T$-dependence of $\lambda$ consistently indicate
the fully gapped superconductivity at $x=0.76$ and the (line) nodal
superconductivity at higher hole concentrations. The magnitudes of
$\frac{\kappa}{T}\cdot T_c|_{T \rightarrow 0\,{\rm K}}$ and
$\frac{d\lambda}{d(T/T_c)}$ at low temperatures, both of which are determined
by the properties of the low-energy excitations, exhibit a highly unusual
non-monotonic x-dependence. These results indicate a dramatic change of the
nodal characteristics in a narrow doping range, suggesting a doping crossover
of the gap function between the s-wave states with and without sign reversal
between $\Gamma$-centered hole pockets.


title: Performance of the Cherenkov Telescope Array at energies above 10 TeV

abstract:
  The Cherenkov Telescope Array (CTA) is the next generation observatory for
very high energy gamma rays. The capability of the array to detect gamma-rays
above 10 TeV is going to be achieved with a large number of Small Size
Telescopes (SSTs) which will cover a large area. The subarray composed of SSTs
has to compromise the number of telescopes (cost) and the large effective area.
The separation between the telescopes has to be adjusted to achieve highest
sensitivity with the smallest number of telescopes. On the other hand larger
separation can worsen the energy threshold as well as the energy and angular
resolutions. In our study we have investigated the optimal spacing between the
telescopes of the SST array using an analytical approach and the concept of
telescope cell consisting of four telescopes as well as Monte Carlo simulations
of the sets of cells.


title: On Sasaki-Ricci solitons and their deformations

abstract:
  We extend to the Sasakian setting a result of Tian and Zhu about the
decomposition of the Lie algebra of holomorphic vector fields on a K\"ahler
manifold in the presence of a K\"ahler-Ricci soliton. Furthermore we apply
known deformations of Sasakian structures to a Sasaki-Ricci soliton to obtain a
stability result concerning \emph{generalized} Sasaki-Ricci solitons,
generalizing Li in the K\"ahler setting and also He and Song by relaxing some
of their assumptions.


title: Sip Overload Control Testbed: Design, Building and Evaluation

abstract:
  Having facilities such as being in text form, end-to-end connection
establishment, and being independence from the type of transmitted data, SIP
protocol is a good choice for signaling protocol in order to set up a
connection between two users of an IP network. Although utilization of SIP
protocol in a wide range of applications has made various vulnerabilities in
this protocol, amongst which overload could make serious problems in SIP
servers. A SIP is overloaded when it does not have sufficient resources
(majorly CPU processing power and memory) to process all messages. In this
paper the window-based overload control mechanism which does not require
explicit feedback is developed and implemented on Asterisk open source proxy
and evaluated. The results of implementation show that this method could
practically maintain throughput in case of overload. As we know this is the
only overload control method which is implemented on a real platform without
using explicit feedback. The results show that the under load server maintains
its throughput at the maximum capacity.


title:
A new method for comparing rankings through complex networks: Model and
  analysis of competitiveness of major European soccer leagues

abstract:
  In this paper we show a new technique to analyze families of rankings. In
particular we focus on sports rankings and, more precisely, on soccer leagues.
We consider that two teams compete when they change their relative positions in
consecutive rankings. This allows to define a graph by linking teams that
compete. We show how to use some structural properties of this competitivity
graph to measure to what extend the teams in a league compete. These structural
properties are the mean degree, the mean strength and the clustering
coefficient. We give a generalization of the Kendall's correlation coefficient
to more than two rankings. We also show how to make a dynamic analysis of a
league and how to compare different leagues. We apply this technique to analyze
the four major European soccer leagues: Bundesliga, Italian Lega, Spanish Liga,
and Premier League. We compare our results with the classical analysis of sport
ranking based on measures of competitive balance.


title:
Time Homogeneous Diffusion with drift and killing to meet a given
  marginal

abstract:
  This article gives conditions on a probability measure and drift field b such
that for a given killing field k and a given time t > 0, there is function a
such that there is a time homogeneous Markov process with infinitesimal
generator a((1/2)d^2/dx^2 + b d/dx - k) which meets the given marginal at time
t.


title:
Proper motions of young stars in Chamaeleon. II. New kinematical
  candidate members of Chamaeleon I and II

abstract:
  The Chamaeleon star-forming region has been extensively studied in the last
decades. However, most studies have been confined to the densest parts of the
clouds. In a previous paper, we analysed the kinematical properties of the
spectroscopically confirmed population of the Chamaeleon I and II clouds. We
now report on a search for new kinematical candidate members to the Chamaeleon
I and II moving groups using available information from public databases and
catalogues. Our candidates were initially selected in an area of 3 deg around
each cloud on the basis of proper motions and colours from the UCAC4 Catalog.
The SEDs of the objects were constructed using photometry retrieved from the
Virtual Observatory and other resources, and fitted to models of stellar
photospheres to derive effective temperatures, gravity values, and
luminosities. Masses and ages were estimated by comparison with theoretical
evolutionary tracks in a Hertzprung-Russell diagram. We have identified 51 and
14 candidate members to the Chamaeleon I and II moving groups, respectively, of
which 17 and 1, respectively, are classified as probable young stars (ages < 20
Myr) according to our analysis. Another object in Chamaeleon I located slightly
above the 1 Myr isochrone is classified as a possible young star. All these
objects are diskless stars with masses in the range 0.3M-1.4MSun, and ages
consistent with those reported for the corresponding confirmed members. They
tend to be located at the boundaries of or outside the dark clouds, preferably
to the north-east and south-east in the case of Chamaeleon I, and to the
north-east in the case of Chamaeleon II. We conclude that the kinematical
population of Chamaeleon I and II could be larger and spread over a larger area
of the sky than suggested by previous studies.


title: Elastic pbar-d scattering and total pbar-d cross sections reexamined

abstract:
  We update our recent analysis of pbar-d scattering, performed within the
Glauber theory including the single- and double pbar-N scattering mechanisms.
Specifically, now we consider also Nbar-N amplitudes from a new partial-wave
analysis of pbar-p scattering data. Predictions for differential cross sections
and the spin observables A_y^d, A_y^pbar, A_xx, A_yy are presented for
antiproton beam energies between 50 and 300 MeV. Total polarized cross sections
are calculated utilizing the optical theorem. The efficiency of the
polarization buildup for antiprotons in a storage ring is investigated.


title: Fermi liquid theory of resonant spin pumping

abstract:
  We study resonant all-electric adiabatic spin pumping through a quantum dot
with two nearby levels by using a Fermi liquid approach in the strongly
interacting regime, combined with a projective numerical renormalization group
(NRG) theory. Due to spin-orbit coupling, a strong spin pumping resonance
emerges at every charging transition, which allows for the transfer of a spin
$~ \hbar/2$ through the device in a single pumping cycle. Depending on the
precise geometry of the device, controlled pure spin pumping is also possible.


title:
Linear polarization of gluons and photons in unpolarized collider
  experiments

abstract:
  We study azimuthal asymmetries in heavy quark pair production in unpolarized
electron-proton and proton-proton collisions, where the asymmetries originate
from the linear polarization of gluons inside unpolarized hadrons. We provide
cross section expressions and study the maximal asymmetries allowed by
positivity, for both charm and bottom quark pair production. The upper bounds
on the asymmetries are shown to be very large depending on the transverse
momentum of the heavy quarks, which is promising especially for their
measurements at a possible future Electron-Ion Collider or a Large Hadron
electron Collider. We also study the analogous processes and asymmetries in
muon pair production as a means to probe linearly polarized photons inside
unpolarized protons. For increasing invariant mass of the muon pair the
asymmetries become very similar to the heavy quark pair ones. Finally, we
discuss the process dependence of the results that arises due to differences in
color flow and address the problem with factorization in case of proton-proton
collisions.


title:
Study of the hadronisation process from single hadron and hadron-pair
  production in SIDIS at COMPASS

abstract:
  Hadron production in hard scattering reactions is described by the
hadronization mechanism which combines quarks into final-state hadrons. Within
the theoretical framework of leading-twist collinear QCD, the cross section for
hadron production in semi-inclusive deep-inelastic scattering can be factorized
into a hard scattering cross section describing the hard interaction at the
quark level calculable in perturbative QED, and non-perturbative universal
functions: parton distribution functions which reflect the quark structure of
initial-state hadrons and collinear fragmentation functions which encode
details on the hadronization process. In the last decades, a major effort has
been achieved on theoretical and experimental levels and allowed to constraint,
with very high precision, parton distribution functions except strange quark
distribution, which still carries large uncertainties. Fragmentation functions,
however, remain at a very preliminary stage of study with a growing interest in
a more accurate and precise knowledge. Nowadays, while pion fragmentation
functions are known with a limited precision and kaon fragmentation functions
are poorly known, the situation for dihadron fragmentation functions turns out
to be behind the schedule and no studies or measurements have been yet
performed.Measuring both single hadron and hadron pair multiplicities in
semi-inclusive deep inelastic scattering at COMPASS represent a fundamental
contribution towards a better understanding of the hadronization process and a
first measurement for hadron pair multiplicities in SIDIS. These measurements
will be presented and discussed.


title: Pleasantly Consuming Linked Data with RDF Data Descriptions

abstract:
  Although the intention of RDF is to provide an open, minimally constraining
way for representing information, there exists an increasing number of
applications for which guarantees on the structure and values of an RDF data
set become desirable if not essential. What is missing in this respect are
mechanisms to tie RDF data to quality guarantees akin to schemata of relational
databases, or DTDs in XML, in particular when translating legacy data coming
with a rich set of integrity constraints - like keys or cardinality
restrictions - into RDF. Addressing this shortcoming, we present the RDF Data
Description language (RDD), which makes it possible to specify instance-level
data constraints over RDF. Making such constraints explicit does not only help
in asserting and maintaining data quality, but also opens up new optimization
opportunities for query engines and, most importantly, makes query formulation
a lot easier for users and system developers. We present design goals, syntax,
and a formal, First-order logics based semantics of RDDs and discuss the impact
on consuming Linked Data.


title: ALMA imaging of the CO snowline of the HD 163296 disk with DCO+

abstract:
  The high spatial and line sensitivity of ALMA opens the possibility of
resolving emission from molecules in circumstellar disks. With an understanding
of physical conditions under which molecules have high abundance, they can be
used as direct tracers of distinct physical regions. In particular, DCO+ is
expected to have an enhanced abundance within a few Kelvin of the CO freezeout
temperature of 19 K, making it a useful probe of the cold disk midplane. We
compare ALMA line observations of HD 163296 to a grid of models. We vary the
upper- and lower-limit temperatures of the region in which DCO+ is present as
well as the abundance of DCO+ in order to fit channel maps of the DCO+ J=5-4
line. To determine the abundance enhancement compared to the general
interstellar medium, we carry out similar fitting to HCO+ J=4-3 and H13CO+
J=4-3 observations. ALMA images show centrally peaked extended emission from
HCO+ and H13CO+. DCO+ emission lies in a resolved ring from ~110 to 160 AU. The
outer radius approximately corresponds to the size of the CO snowline as
measured by previous lower resolution observations of CO lines in this disk.
The ALMA DCO+ data now resolve and image the CO snowline directly. In the best
fitting models, HCO+ exists in a region extending from the 19 K isotherm to the
photodissociation layer with an abundance of 3x10^-10 relative to H2. DCO+
exists within the 19-21 K region of the disk with an abundance ratio [DCO+] /
[HCO+] = 0.3. This represents a factor of 10^4 enhancement of the DCO+
abundance within this narrow region of the HD 163296 disk. Such a high
enhancement has only previously been seen in prestellar cores. The inferred
abundances provide a lower limit to the ionization fraction in the midplane of
the cold outer disk (approximately greater than 4x10^-10), and suggest the
utility of DCO+ as a tracer of its parent molecule H2D+. Abridged