title: Routing Proposals for Multipath Interdomain Routing

abstract:
  Internet is composed of numbers of independent autonomous systems. BGP is
used to disseminate reachability information and establishing path between
autonomous systems. Each autonomous system is allowed to select a single route
to a destination and then export the selected route to its neighbors. The
selection of single best route imposes restrictions on the use of alternative
paths during interdomain link failure and thus, incurred packet loss. Packet
loss still occurs even when multiple paths exist between source and destination
but these paths have not been utilized. To minimize the packet loss, when
multiple paths exist, multipath routing techniques are introduced. Multipath
routing techniques ensure the use of alternative paths on link failure. It
computes set of paths which can be used when primary path is not available and
it also provides a way to transit domains to have control over the traffic
flow. This can be achieved by little modification to current BGP. This paper
highlights different multipath routing techniques and also discusses the
overhead incurred by each of them.


title: Associative detachment of rubidium hydroxide

abstract:
  We performed calculations of the optimized structure, harmonic vibrational
frequencies and dissociation energies of RbOH and its anion, and investigate
the interactions between Rb and OH$^-$ leading to possible associative
detachment pathways. The electron affinity of RbOH was computed to be 0.2890
eV, with a bond energy of Rb+OH$^-$ half that of Rb+OH. To determine other
possible charge loss pathways, the Rb+OH and Rb+OH$^-$ dissociation curves were
computed using couple cluster methods along all possible collisional angles. An
adiabatic curve crossing between the neutral and charged molecule was found at
the inner wall of the molecular potential curve for linear geometries.
Associative detachment rates were estimated using the Langevin ion capture
cross-section for hydroxide. We find for $v\ge 2$ an associative detachment
rate of $>2\times 10^{-9}$ cm$^3$s$^{-1}$, while for $v=0$ and 1 no appreciable
rate exists. This strong dependence on vibrational level suggests the ability
to control the associative detachment rate directly.


title: Doping-Induced Spectral Shifts in Two Dimensional Metal Oxides

abstract:
  Doping of strongly layered ionic oxides is an established paradigm for
creating novel electronic behavior. This is nowhere more apparent than in
superconductivity, where doping gives rise to high temperature
superconductivity in cuprates (hole-doped) and to surprisingly high Tc in HfNCl
(Tc=25.5K, electron-doped). First principles calculations of hole-doping of the
layered delafossite CuAlO2 reveal unexpectedly large doping-induced shifts in
spectral density, strongly in opposition to the rigid band picture that is
widely used as an accepted guideline. These spectral shifts, of similar origin
as the charge transfer used to produce negative electron affinity surfaces and
adjust Schottky barrier heights, drastically alter the character of the Fermi
level carriers, leading in this material to an O-Cu-O molecule-based carrier
(or polaron, at low doping) rather than a nearly pure-Cu hole as in a rigid
band picture. First principles linear response electron-phonon coupling (EPC)
calculations reveal, as a consequence, net weak EPC and no superconductivity
rather than the high Tc obtained previously using rigid band expectations.
These specifically two-dimensional dipole-layer driven spectral shifts provides
new insights into materials design in layered materials foe functionalities
besides superconductivity.


title:
Impact of mobility models on clustering based routing protocols in
  mobile WSNs

abstract:
  This paper presents comparison of different hierarchical (position and
non-position based) protocols with respect to different mobility models.
Previous work mainly focuses on static networks or at most a single mobility
model. Using only one mobility model may not predict the behavior of routing
protocol accurately. Simulation results show that mobility has large impact on
the behavior of WSN routing protocols. Also, position based routing protocols
performs better in terms of packet delivery compared to non position based
routing protocols.


title: Root Statistics of Random Polynomials with Bounded Mahler Measure

abstract:
  The Mahler measure of a polynomial is a measure of complexity formed by
taking the modulus of the leading coefficient times the modulus of the product
of its roots outside the unit circle. The roots of a real degree $N$ polynomial
chosen uniformly from the set of polynomials of Mahler measure at most 1 yields
a Pfaffian point process on the complex plane. When $N$ is large, with
probability tending to 1, the roots tend to the unit circle, and we investigate
the asymptotics of the scaled kernel in a neighborhood of a point on the unit
circle. When this point is away from the real axis (on which there is a
positive probability of finding a root) the scaled process degenerates to a
determinantal point process with the same local statistics (i.e., scalar
kernel) as the limiting process formed from the roots of complex polynomials
chosen uniformly from the set of polynomials of Mahler measure at most 1. Three
new matrix kernels appear in a neighborhood of $\pm 1$ which encode information
about the correlations between real roots, between complex roots and between
real and complex roots. Away from the unit circle, the kernels converge to new
limiting kernels, which imply among other things that the expected number of
roots in any open subset of $\C$ disjoint from the unit circle converges to a
positive number. We also give ensembles with identical statistics drawn from
two-dimensional electrostatics with potential theoretic weights, and normal
matrices chosen with regard to their topological entropy as actions on
Euclidean space.


title: A Performance Comparison of Network Simulators for Wireless Networks

abstract:
  Network simulation is the most useful and common methodology used to evaluate
different network to-pologies without real world implementation. Network
simulators are widely used by the research community to evaluate new theories
and hypotheses. There are a number of network simulators, for instance, ns-2,
ns-3, OMNET++, SWAN, OPNET, Jist, and GloMoSiM etc. Therefore, the selection of
a network simulator for evaluating research work is a crucial task for
researchers. The main focus of this paper is to compare the state-of-the-art,
open source network simulators based on the following parameters: CPU
utilization, memory usage, computational time, and scalability by simulating a
MANET routing protocol, to identify an optimal network simulator for the
research community.


title: Symmetry Energy II: Isobaric Analog States

abstract:
  Using excitation energies to isobaric analog states (IAS) and charge
invariance, we extract nuclear symmetry coefficients, from a mass formula, on a
nucleus-by-nucleus basis. Consistently with charge invariance, the coefficients
vary weakly across an isobaric chain. However, they change strongly with
nuclear mass and range from a_a~10 MeV at mass A~10 to a_a~22 MeV at A~240.
Following the considerations of a Hohenberg-Kohn functional for nuclear
systems, we determine how to find in practice the symmetry coefficient using
neutron and proton densities, even when those densities are simultaneously
affected by significant symmetry-energy and Coulomb effects. These results
facilitate extracting the symmetry coefficients from Skyrme-Hartree-Fock (SHF)
calculations, that we carry out using a variety of Skyrme parametrizations in
the literature. For the parametrizations, we catalog novel short-wavelength
instabilities. In comparing the SHF and IAS results for the symmetry
coefficients, we arrive at narrow (+-2.4 MeV) constraints on the symmetry
energy values S(rho) at 0.04<rho<0.13 fm^-3. Towards normal density the
constraints significantly widen, but the normal value of energy a_a^V and the
slope parameter L are found to be strongly correlated. To narrow the
constraints, we reach for the measurements of asymmetry skins and arrive at
a_a^V=(30.2-33.7) MeV and L=(35-70) MeV, with those values being again strongly
positively correlated along the diagonal of their combined region. Inclusion of
the skin constraints allows to narrow the constraints on S(rho), at
0.04<rho<0.13 fm^-3, down to +-1.1 MeV. Several microscopic calculations,
including variational, Bruckner-Hartree-Fock and Dirac-Bruckner-Hartree-Fock,
are consistent with our constraint region on S(rho).


title:
Pairing and rotational properties of actinides and superheavy nuclei in
  covariant density functional theory

abstract:
  The cranked relativistic Hartree-Bogoliubov (CRHB) theory has been applied
for a systematic study of pairing and rotational properties of actinides and
light superheavy nuclei. Pairing correlations are taken into account by the
Brink-Booker part of finite range Gogny D1S force. For the first time in the
covariant density functional theory (CDFT) framework the pairing properties are
studied via the quantities (such as three-point $\Delta^{(3)}$ indicators)
related to odd-even mass staggerings. The investigation of the moments of
inertia at low spin and the $\Delta^{(3)}$ indicators shows the need for an
attenuation of the strength of the Brink-Booker part of the Gogny D1S force in
pairing channel. The investigation of rotational properties of even-even and
odd-mass nuclei at normal deformation, performed in the density functional
theory framework in such a systematic way for the first time, reveals that in
the majority of the cases the experimental data are well described. These
include the evolution of the moments of inertia with spin, band crossings in
the $A\geq 242$ nuclei, the impact of the particle in specific orbital on the
moments of inertia in odd-mass nuclei. The analysis of the discrepancies
between theory and experiment in the band crossing region of $A\leq 240$ nuclei
suggests the stabilization of octupole deformation at high spin, not included
in the present calculations. The evolution of pairing with deformation, which
is important for the fission barriers, has been investigated via the analysis
of the moments of inertia in the superdeformed minimum. The dependence of the
results on the CDFT parametrization has been studied by comparing the results
of the calculations obtained with the NL1 and NL3* parametrizations.


title: Energy Disaggregation via Adaptive Filtering

abstract:
  The energy disaggregation problem is recovering device level power
consumption signals from the aggregate power consumption signal for a building.
We show in this paper how the disaggregation problem can be reformulated as an
adaptive filtering problem. This gives both a novel disaggregation algorithm
and a better theoretical understanding for disaggregation. In particular, we
show how the disaggregation problem can be solved online using a filter bank
and discuss its optimality.


title:
Weak Antilocalization and Linear Magnetoresistance in The Surface State
  of SmB6

abstract:
  Strongly correlated Kondo insulator SmB6 is known for its peculiar low
temperature residual conduction, which has recently been demonstrated to arise
from a robust metallic surface state, as predicted by the theory of topological
Kondo insulator (TKI). Photoemission, quantum oscillation and magnetic doping
experiments have provided evidence for the Dirac-like dispersion and
topological protection. Questions arise as whether signatures of spin-momentum
locking and electron interaction could be resolved in transport measurements.
Here we report metallic conduction of surface state down to mK temperatures
with saturation behaviors suggestive of Kondo effect. We observe in the surface
state the weak-antilocalization (WAL) effect that is in agreement with a
spin-momentum locked metallic surface. At larger perpendicular magnetic fields,
the surface state exhibits an unusual linear magnetoresistance similar to those
found in Bi-based topological insulators and in graphene. (Correspondence to:
xia.jing@uci.edu)


title:
Non linear magnetotransport theory and Hall induced resistance
  oscillations in graphene

abstract:
  The quantum oscillations of nonlinear magnetoresistance in graphene that
occurs in response to a dc current bias are investigated. We present a
theoretical model for the nonlinear magnetotransport of graphene carriers. The
model is based on the exact solution of the effective Dirac equation in crossed
electric and magnetic fields, while the effects of randomly distributed
impurities are perturbatively added. To compute the nonlinear current we
develop a covariant formulation of the migration center theory. The analysis of
the differential resistivity in the large magnetic field region, shows that the
extrema of the Shubnikov de Hass oscillations invert when the dc currents
exceeds a threshold value. This results are in good agreement with the
experimental observations. At small magnetic field, the existence of Hall
induced resistance oscillations are predicted for ultra clean graphene samples.
These oscillations originate from Landau-Zener transitions between Landau
levels, that are tilted by the strong electric Hall field.


title: Paradigms in Physics Education Research

abstract:
  In this paper, we describe two paradigms in physics education research (PER):
recurrence-oriented and case-oriented PER. We connect theory on research
methodologies in the social sciences to interviews with physics education
researchers and examples of published PER to articulate the specific
assumptions of recurrence- and case-oriented PER. We show that the different
assumptions made in these two paradigms bear out in specific aims and research
designs taken up by physics education researchers. In particular,
recurrence-oriented research seeks reproducible, representative patterns and
relationships; human behavior is modeled as governed by lawful (albeit
probabilistic) relationships. Case-oriented research, in contrast, seeks to
refine and develop theory by linking that theory to cases; human action is
assumed to be shaped by the meanings that participants make of their local
environments. We briefly offer examples in which researchers take up both the
recurrence- and case-oriented research paradigms.


title:
Selection, Generalization, and Theories of Cause in Case-Oriented
  Physics Education Research

abstract:
  Case-oriented physics education research - which seeks to refine and develop
theory by linking that theory to cases - incorporates distinct practices for
selecting data for analysis, generalizing results, and making causal claims.
Unanswered questions about these practices may constrain researchers more
familiar with the recurrence-oriented research paradigm - which seeks to inform
instructional predictions by discerning reproducible, representative patterns
and relationships - from participating in or critically engaging with
case-oriented research. We use results from interviews with physics education
researchers, a synthesis of the literature on research methodologies, and
published examples of case-oriented and recurrence-oriented research to answer
"hard-hitting questions" that researchers may pose. In doing so, we aim to
substantiate our position that both case-oriented and recurrence- oriented PER
are rigorous but that the rigor is of a different nature in each paradigm.


title:
A model-based approach for identifying signatures of balancing selection
  in genetic data

abstract:
  While much effort has focused on detecting positive and negative directional
selection in the human genome, relatively little work has been devoted to
balancing selection. This lack of attention is likely due to the paucity of
sophisticated methods for identifying sites under balancing selection. Here we
develop two composite likelihood ratio tests for detecting balancing selection.
Using simulations, we show that these methods outperform competing methods
under a variety of assumptions and demographic models. We apply the new methods
to whole-genome human data, and find a number of previously-identified loci
with strong evidence of balancing selection, including several HLA genes.
Additionally, we find evidence for many novel candidates, the strongest of
which is FANK1, an imprinted gene that suppresses apoptosis, is expressed
during meiosis in males, and displays marginal signs of segregation distortion.
We hypothesize that balancing selection acts on this locus to stabilize the
segregation distortion and negative fitness effects of the distorter allele.
Thus, our methods are able to reproduce many previously-hypothesized signals of
balancing selection, as well as discover novel interesting candidates.


title: Point transitivity, $\Delta$-transitivity and multi-minimality

abstract:
  Let $(X, f)$ be a topological dynamical system and $\mathcal {F}$ be a
Furstenberg family (a collection of subsets of $\mathbb{N}$ with hereditary
upward property). A point $x\in X$ is called an $\mathcal {F}$-transitive point
if for every non-empty open subset $U$ of $X$ the entering time set of $x$ into
$U$, $\{n\in \mathbb{N}: f^{n}(x) \in U\}$, is in $\mathcal {F}$; the system
$(X,f)$ is called $\mathcal {F}$-point transitive if there exists some
$\mathcal {F}$-transitive point. In this paper, we first discuss the connection
between $\mathcal {F}$-point transitivity and $\mathcal {F}$-transitivity, and
show that weakly mixing and strongly mixing systems can be characterized by
$\mathcal {F}$-point transitivity, completing results in [Transitive points via
Furstenberg family, Topology Appl. 158 (2011), 2221--2231]. We also show that
multi-transitivity, $\Delta$-transitivity and multi-minimality can also be
characterized by $\mathcal {F}$-point transitivity, answering two questions
proposed by Kwietniak and Oprocha [On weak mixing, minimality and weak
disjointness of all iterates, Erg. Th. Dynam. Syst., 32 (2012), 1661--1672].


title:
Properties of non-q\bar{q} XYZ mesons and results of a search for the
  H-dibaryon

abstract:
  A number of charmonium- and bottomonium-like meson states have been observed
that have properties that do not match well to expectations for the simple
quark-antiquark substructure suggested by the constituent quark model. Some of
them are electrically charged and decay to final states containing hidden
charmonum or bottomonium mesons and, thus, must contain at least four quarks.
Common properties of these so-called XYZ mesons are partial widths for decays
to hidden quarkonium states plus light hadrons that are much larger than
corresponding partial widths for established quarkonium mesons. I review some
recent results from the Belle experiment, including the recent discovery of two
charged bottomium-like states, the Z_b(10610)^+ and Z_b(10650)^+, that decay to
pi^+pi^- h_b(mS) (m=1,2) and pi^+ Upsilon(nS) (n=1,2,3) final states. In
addition, I present recent Belle results from a search for H-dibaryon
production in inclusive Upsilon(1S) and Upsilon(2S) decays.


title: On the aftershocks of the Great Sumatra-Andaman earthquake

abstract:
  Analysis of the Sumatra-Andaman earthquake on 26.12.2004 (M = 9) has allowed
us to identify two non- trivial properties of the dynamics of aftershocks.
First, the strongest aftershock (M = 7.2) was likely triggered by the
round-the-world seismic echo of the main shock. The idea is that the surface
waves propagating outwards from the main shock return back to the vicinity of
the epicenter after having made a complete revolution around the Earth and
induce there the aftershock. The second property is the modulation of the
aftershock sequence by the fundamental oscillation of the Earth 0S2 excited by
the main shock. Both results are supported by analysis of the Tohoku earthquake
(11.03.2011, M = 9), as well as by the statistical analysis of the USGS
earthquake catalog.


title: Evolution via imitation among like-minded individuals

abstract:
  In social situations with which evolutionary game is concerned, individuals
are considered to be heterogeneous in various aspects. In particular, they may
differently perceive the same outcome of the game owing to heterogeneity in
idiosyncratic preferences, fighting abilities, and positions in a social
network. In such a population, an individual may imitate successful and similar
others, where similarity refers to that in the idiosyncratic fitness function.
I propose an evolutionary game model with two subpopulations on the basis of
multipopulation replicator dynamics to describe such a situation. In the
proposed model, pairs of players are involved in a two-person game as a
well-mixed population, and imitation occurs within subpopulations in each of
which players have the same payoff matrix. It is shown that the model does not
allow any internal equilibrium such that the dynamics differs from that of
other related models such as the bimatrix game. In particular, even a slight
difference in the payoff matrix in the two subpopulations can make the opposite
strategies to be stably selected in the two subpopulations in the snowdrift and
coordination games.


title:
Moore-Penrose Invertibility of Differences and Products of Projections
  in Rings with Involution

abstract:
  This article concerns the MP inverse of the differences and the products of
projections in a ring $R$ with involution. Some equivalent conditions are
obtained. As applications, the MP invertibility of the commutator $pq-qp$ and
the anti-commutator $pq+qp$ are characterized, where $p$ and $q$ are
projections in $R$. Some related known results in $C^*$-algebra are
generalized.


title:
Storage Sizing and Placement through Operational and Uncertainty-Aware
  Simulations

abstract:
  As the penetration level of transmission-scale time-intermittent renewable
generation resources increases, control of flexible resources will become
important to mitigating the fluctuations due to these new renewable resources.
Flexible resources may include new or existing synchronous generators as well
as new energy storage devices. Optimal placement and sizing of energy storage
to minimize costs of integrating renewable resources is a difficult
optimization problem. Further,optimal planning procedures typically do not
consider the effect of the time dependence of operations and may lead to
unsatisfactory results. Here, we use an optimal energy storage control
algorithm to develop a heuristic procedure for energy storage placement and
sizing. We perform operational simulation under various time profiles of
intermittent generation, loads and interchanges (artificially generated or from
historical data) and accumulate statistics of the usage of storage at each node
under the optimal dispatch. We develop a greedy heuristic based on the
accumulated statistics to obtain a minimal set of nodes for storage placement.
The quality of the heuristic is explored by comparing our results to the
obvious heuristic of placing storage at the renewables for IEEE benchmarks and
real-world network topologies.


title: The Origin of the Dynamical Quantum Non-locality

abstract:
  Non-locality is one of the hallmarks of quantum mechanics and is responsible
for paradigmatic features such as entanglement[1] and the Aharonov-Bohm
effect[2,3]. Non-locality comes in two "flavours": a \emph{kinematic
non-locality}-- arising from the structure of the Hilbert space--[4-6] and a
\emph{dynamical non-locality}-- arising from the quantum equations of
motion--[2,3,5,6]. Despite of its main role in quantum information processing,
kinematic non-locality is unable to induce any change in the probability
distributions, so that the "action-at-a-distance" cannot manifest[5,6].
Conversely, dynamical non-locality does create explicit changes in probability,
though in a "causality-preserving" manner[6,7]. Recently, the origin of the
kinematic non-locality was related to the uncertainty principle[8], here we
trace the origin of dynamical non-locality to the superposition principle. This
relation adds to the more fundamental understanding of the nature of quantum
dynamics and allows us to establish and identify how the uncertainty and the
superposition principles determine the non-local character of the outcome of a
quantum measurement. Thus, dynamical non-locality emerges as the responsible of
the breakdown of the dynamical classical realism[9] and therefore, as key
feature in the classical-quantum transition. Most importantly, being based on
group theoretical and path integral formulations, our formulation admits
immediate generalizations and extensions to, e.g., quantum field theory.

categories: quant-ph gr-qc hep-th physics.atom-ph physics.chem-ph


title: A Safe Screening Rule for Sparse Logistic Regression

abstract:
  The l1-regularized logistic regression (or sparse logistic regression) is a
widely used method for simultaneous classification and feature selection.
Although many recent efforts have been devoted to its efficient implementation,
its application to high dimensional data still poses significant challenges. In
this paper, we present a fast and effective sparse logistic regression
screening rule (Slores) to identify the 0 components in the solution vector,
which may lead to a substantial reduction in the number of features to be
entered to the optimization. An appealing feature of Slores is that the data
set needs to be scanned only once to run the screening and its computational
cost is negligible compared to that of solving the sparse logistic regression
problem. Moreover, Slores is independent of solvers for sparse logistic
regression, thus Slores can be integrated with any existing solver to improve
the efficiency. We have evaluated Slores using high-dimensional data sets from
different applications. Extensive experimental results demonstrate that Slores
outperforms the existing state-of-the-art screening rules and the efficiency of
solving sparse logistic regression is improved by one magnitude in general.


title:
Wireless Physical Layer Security with Imperfect Channel State
  Information: A Survey

abstract:
  Physical layer security is an emerging technique to improve the wireless
communication security, which is widely regarded as a complement to
cryptographic technologies. To design physical layer security techniques under
practical scenarios, the uncertainty and imperfections in the channel knowledge
need to be taken into consideration. This paper provides a survey of recent
research and development in physical layer security considering the imperfect
channel state information (CSI) at communication nodes. We first present an
overview of the main information-theoretic measures of the secrecy performance
with imperfect CSI. Then, we describe several signal processing enhancements in
secure transmission designs, such as secure on-off transmission, beamforming
with artificial noise, and secure communication assisted by relay nodes or in
cognitive radio systems. The recent studies of physical layer security in
large-scale decentralized wireless networks are also summarized. Finally, the
open problems for the on-going and future research are discussed.


title: Exploring the mechanisms of protein folding

abstract:
  Neither of the two prevalent theories, namely thermodynamic stability and
kinetic stability, provides a comprehensive understanding of protein folding.
The thermodynamic theory is misleading because it assumes that free energy is
the exclusive dominant mechanism of protein folding, and attributes the
structural transition from one characteristic state to another to energy
barriers. Conversely, the concept of kinetic stability overemphasizes dominant
mechanisms that are related to kinetic factors. This article explores the
stability condition of protein structures from the viewpoint of meso-science,
paying attention to the compromise in the competition between minimum free
energy and other dominant mechanisms. Based on our study of complex systems, we
propose that protein folding is a meso-scale, dissipative, nonlinear and
non-equilibrium process that is dominated by the compromise between free energy
and other dominant mechanisms such as environmental factors. Consequently, a
protein shows dynamic structures, featuring characteristic states that appear
alternately and dynamically, only one of which is the state with minimum free
energy. To provide evidence for this concept, we analyzed the time series of
energetic and structural changes of three simulations of protein
folding/unfolding. Our results indicate that thorough consideration of the
multiple dynamic characteristic structures generated by multiple mechanisms may
be the key to understanding protein folding.


title:
The performance of a double sided silicon strip detector as a
  transmission detector for heavy ions

abstract:
  The performance of a double sided silicon strip detector (DSSSD), used for
position and energy detection of heavy ions, is reported. The analysis shows
that the incomplete charge collection (ICC) and charge sharing (CS) effects of
the DSSSD give rise to a loss of energy resolution, however the position
information is recorded without ambiguity. Representations of ICC/CS events in
the energy spectra are shown and their origins are confirmed by correlation
analysis of the spectra from both junction side and ohmic side of the DSSSD.


title:
Self-Interference Cancellation with Phase Noise Induced ICI Suppression
  for Full-Duplex Systems

abstract:
  One of the main bottlenecks in practical full-duplex systems is the
oscillator phase noise, which bounds the possible cancellable self-interference
power. In this paper, a digitaldomain self-interference cancellation scheme for
full-duplex orthogonal frequency division multiplexing systems is proposed. The
proposed scheme increases the amount of cancellable selfinterference power by
suppressing the effect of both transmitter and receiver oscillator phase noise.
The proposed scheme consists of two main phases, an estimation phase and a
cancellation phase. In the estimation phase, the minimum mean square error
estimator is used to jointly estimate the transmitter and receiver phase noise
associated with the incoming self-interference signal. In the cancellation
phase, the estimated phase noise is used to suppress the intercarrier
interference caused by the phase noise associated with the incoming
self-interference signal. The performance of the proposed scheme is numerically
investigated under different operating conditions. It is demonstrated that the
proposed scheme could achieve up to 9dB more self-interference cancellation
than the existing digital-domain cancellation schemes that ignore the
intercarrier interference suppression.


title: Explicit Maximally Recoverable Codes with Locality

abstract:
  Consider a systematic linear code where some (local) parity symbols depend on
few prescribed symbols, while other (heavy) parity symbols may depend on all
data symbols. Local parities allow to quickly recover any single symbol when it
is erased, while heavy parities provide tolerance to a large number of
simultaneous erasures. A code as above is maximally-recoverable if it corrects
all erasure patterns which are information theoretically recoverable given the
code topology. In this paper we present explicit families of
maximally-recoverable codes with locality. We also initiate the study of the
trade-off between maximal recoverability and alphabet size.


title:
Large Enhancement of the Photoluminescence Emission of Photoexcited
  Undoped GaAs Quantum Wells Induced by an Intense Single-Cycle Terahertz Pulse

abstract:
  Intense terahetz (THz) pulses induce a photoluminescence (PL) flash from
undoped high-quality GaAs/AlGaAs quantum wells under continuous wave laser
excitation. The number of excitons increases 10000-fold from that of the steady
state under only laser excitation. The THz electric field dependence and the
relaxation dynamics of the PL flash intensity suggest that the strong electric
field of the THz pulse ionizes impurity states during the one-picosecond period
of the THz pulse and release carriers from a giant reservoir containing
impurity states in the AlGaAs layers.


title:
Suppression of Structural Phase Transition in IrTe2 by Isovalent Rh
  Doping

abstract:
  We report that the isovalent Rh doping of IrTe2 suppresses the
structural/electronic phase transition and induces superconductivity at 2.6 K.
The doping level of Rh that is necessary for suppressing the transition is
three times higher than those of Pt and Pd. Ir1-xRhxTe2 might provide us with a
unique opportunity to study the origin of the structural/electronic phase
transition in IrTe2.


title:
Exploring Rigidly Rotating Vortex Configurations and their Bifurcations
  in Atomic Bose-Einstein Condensates

abstract:
  In the present work, we consider the problem of a system of few vortices $N
\leq 5$ as it emerges from its experimental realization in the field of atomic
Bose-Einstein condensates. Starting from the corresponding equations of motion,
we use a two-pronged approach in order to reveal the configuration space of the
system's preferred dynamical states. On the one hand, we use a Monte-Carlo
method parametrizing the vortex "particles" by means of hyperspherical
coordinates and identifying the minimal energy ground states thereof for $N=2,
..., 5$ and different vortex particle angular momenta. We then complement this
picture with a dynamical systems analysis of the possible rigidly rotating
states. The latter reveals all the supercritical and subcritical pitchfork, as
well as saddle-center bifurcations that arise exposing the full wealth of the
problem even at such low dimensional cases. By corroborating the results of the
two methods, it becomes fairly transparent which branch the Monte-Carlo
approach selects for different values of the angular momentum which is used as
a bifurcation parameter.


title: Extended quark mean-field model for neutron stars

abstract:
  We extend the quark mean-field (QMF) model to strangeness freedom to study
the properties of hyperons ($\Lambda,\Sigma,\Xi$) in infinite baryon matter and
neutron star properties. The baryon-scalar meson couplings in the QMF model are
determined self-consistently from the quark level, where the quark confinement
is taken into account in terms of a scalar-vector harmonic oscillator
potential. The strength of such confinement potential for $u,d$ quarks is
constrained by the properties of finite nuclei, while the one for $s$ quark is
limited by the properties of nuclei with a $\Lambda$ hyperon. These two
strengths are not same, which represents the SU(3) symmetry breaking
effectively in the QMF model. Also, we use an enhanced $\Sigma$ coupling with
the vector meson, and both $\Sigma$ and $\Xi$ hyperon potentials can be
properly described in the model. The effects of the SU(3) symmetry breaking on
the neutron star structures are then studied. We find that the SU(3) breaking
shifts earlier the hyperon onset density and makes hyperons more abundant in
the star, in comparisons with the results of the SU(3) symmetry case. However,
it does not affect much the star's maximum mass. The maximum masses are found
to be $1.62 M_{\odot}$ with hyperons and $1.88 M_{\odot}$ without hyperons. The
present neutron star model is shown to have limitations on explaining the
recently measured heavy pulsar.


title: Proof of a Conjecture of Hirschhorn and Sellers on Overpartitions

abstract:
  Let $\bar{p}(n)$ denote the number of overpartitions of $n$. It was
conjectured by Hirschhorn and Sellers that $\bar{p}(40n+35)\equiv 0\ ({\rm
mod\} 40)$ for $n\geq 0$. Employing 2-dissection formulas of quotients of theta
functions due to Ramanujan, and Hirschhorn and Sellers, we obtain a generating
function for $\bar{p}(40n+35)$ modulo 5. Using the $(p, k)$-parametrization of
theta functions given by Alaca, Alaca and Williams, we give a proof of the
congruence $\bar{p}(40n+35)\equiv 0\ ({\rm mod\} 5)$. Combining this congruence
and the congruence $\bar{p}(4n+3)\equiv 0\ ({\rm mod\} 8)$ obtained by
Hirschhorn and Sellers, and Fortin, Jacob and Mathieu, we give a proof of the
conjecture of Hirschhorn and Sellers.


title:
Efficient Mixed-Norm Regularization: Algorithms and Safe Screening
  Methods

abstract:
  Sparse learning has recently received increasing attention in many areas
including machine learning, statistics, and applied mathematics. The mixed-norm
regularization based on the l1q norm with q>1 is attractive in many
applications of regression and classification in that it facilitates group
sparsity in the model. The resulting optimization problem is, however,
challenging to solve due to the inherent structure of the mixed-norm
regularization. Existing work deals with special cases with q=1, 2, infinity,
and they cannot be easily extended to the general case. In this paper, we
propose an efficient algorithm based on the accelerated gradient method for
solving the general l1q-regularized problem. One key building block of the
proposed algorithm is the l1q-regularized Euclidean projection (EP_1q). Our
theoretical analysis reveals the key properties of EP_1q and illustrates why
EP_1q for the general q is significantly more challenging to solve than the
special cases. Based on our theoretical analysis, we develop an efficient
algorithm for EP_1q by solving two zero finding problems. To further improve
the efficiency of solving large dimensional mixed-norm regularized problems, we
propose a screening method which is able to quickly identify the inactive
groups, i.e., groups that have 0 components in the solution. This may lead to
substantial reduction in the number of groups to be entered to the
optimization. An appealing feature of our screening method is that the data set
needs to be scanned only once to run the screening. Compared to that of solving
the mixed-norm regularized problems, the computational cost of our screening
test is negligible. The key of the proposed screening method is an accurate
sensitivity analysis of the dual optimal solution when the regularization
parameter varies. Experimental results demonstrate the efficiency of the
proposed algorithm.


title:
Pressure-induced enhancement of superconductivity and suppression of
  semiconducting behavior in Ln(O0.5F0.5)BiS2 (Ln = La, Ce) compounds

abstract:
  Electrical resistivity measurements as a function of temperature between 1 K
and 300 K were performed at various pressures up to 3 GPa on the
superconducting layered compounds Ln(O0.5F0.5)BiS2 (Ln = La, Ce). At
atmospheric pressure, La(O0.5F0.5)BiS2 and Ce(O0.5F0.5)BiS2 have
superconducting critical temperatures, Tc, of 3.3 K and 2.3 K, respectively.
For both compounds, the superconducting critical temperature Tc initially
increases, reaches a maximum value of 10.1 K for La(O0.5F0.5)BiS2 and 6.7 K for
CeO(0.5F0.5)BiS2, and then gradually decreases with increasing pressure. Both
samples also exhibit transient behavior in the region between the lower Tc
phase near atmospheric pressure and the higher Tc phase. This region is
characterized by a broadening of the superconducting transition, in which Tc
and the transition width, delta Tc, are reversible with increasing and
decreasing pressure. There is also an appreciable pressure-induced and
hysteretic suppression of semiconducting behavior up to the pressure at which
the maximum value of Tc is found. At pressures above the value at which the
maximum in Tc occurs, there is a gradual decrease of Tc and further suppression
of the semiconducting behavior with pressure, both of which are reversible.


title:
Metrics for multi-detector template placement in searches for
  short-duration nonprecessing inspiral gravitational-wave signals

abstract:
  Using the family of multi-detector F-statistic metrics for short duration,
nonprecessing inspiral signals, we derive a marginalized metric that is
directly applicable to the problem of generating template banks for coincident
and coherent multi-detector searches for gravitational-waves. This metric is
compared to other average metrics, such as that proposed for the case of
searches associated with continuous signals from rotating neutron stars. We
show how the four-dimensional metric can be separated into two two-dimensional
metrics associated with the sky and mass parameter subspaces, allowing the
creation of separate template banks for these subspaces. Finally, we present an
algorithm for computing the mass space metric associated with both coincident
and coherent multi-detector targeted or all-sky searches for short duration,
nonprecessing inspiral gravitational-wave signals.


title:
Enhancement of electron energy to multi-GeV regime by a dual-stage
  laser-wakefield accelerator pumped by petawatt laser pulses

abstract:
  Laser wakefield acceleration offers the promise of a compact electron
accelerator for generating a multi-GeV electron beam using the huge field
gradient induced by an intense laser pulse, compared to conventional rf
accelerators. However, the energy and quality of the electron beam from the
laser wakefield accelerator have been limited by the power of the driving laser
pulses and interaction properties in the target medium. Recent progress in
laser technology has resulted in the realization of a petawatt (PW) femtosecond
laser, which offers new capabilities for research on laser wakefield
acceleration. Here, we present a significant increase in laser-driven electron
energy to the multi-GeV level by utilizing a 30-fs, 1-PW laser system. In
particular, a dual-stage laser wakefield acceleration scheme (injector and
accelerator scheme) was applied to boost electron energies to over 3 GeV with a
single PW laser pulse. Three-dimensional particle-in-cell simulations
corroborate the multi-GeV electron generation from the dual-stage laser
wakefield accelerator driven by PW laser pulses.


title:
Image transport through a disordered optical fiber mediated by
  transverse Anderson localization

abstract:
  Transverse Anderson localization of light allows localized
optical-beam-transport through a transversely-disordered and
longitudinally-invariant medium. Its successful implementation in disordered
optical fibers recently resulted in the propagation of localized beams of radii
comparable with that of conventional optical fibers. We present what is, to the
best of our knowledge, the first demonstration of optical image transport using
transverse Anderson localization of light. The image transport quality obtained
in the polymer disordered optical fiber is comparable with or better than some
of the best commercially available multicore image fibers with less pixelation
and higher contrast. It is argued that considerable improvement in image
transport quality can be obtained in a disordered fiber made from a glass
matrix with near wavelength-size randomly distributed air-holes with an
air-hole fill-fraction of $50\%$. Our results open the way to device-level
implementation of the transverse Anderson localization of light with potential
applications in biological and medical imaging.


title: Quantum-defect theory for $-1/r^4$ type of interactions

abstract:
  We present a quantum-defect theory (QDT) for the $-1/r^4$ type of long-range
potential, as a foundation for a systematic understanding of charge-neutral
quantum systems such as ion-atom, ion-molecule, electron-atom, and
positron-atom interactions. The theory incorporates both conceptual and
mathematical advances since earlier formulations of the theory. It also
includes more detailed discussions of the concept of resonance spectrum and its
representations, universal properties in charge-neutral quantum systems, and
the QDT description of scattering resonances that is applicable to any $-1/r^n$
potential with $n>2$.


title:
Proceedings Fourth International Symposium on Games, Automata, Logics
  and Formal Verification

abstract:
  This volume contains the proceedings of the Fourth International Symposium on
Games, Automata, Logic and Formal Verification (GandALF 2013). The symposium
took place in Borca di Cadore, Italy, from 29th to 31st of August 2013.
  The proceedings of the symposium contain the abstracts of three invited talks
and 17 papers that were accepted after a careful evaluation for presentation at
the conference. The topics of the accepted papers range over a wide spectrum,
including algorithmic and behavioral game theory, game semantics, formal
languages and automata theory, modal and temporal logics, software
verification, hybrid systems.


title:
Measuring reliable surface rotation rates from Kepler photometric
  observations

abstract:
  High-quality time series provided by space instrumentation such as CoRoT and
Kepler, allow us to measure modulations in the light curves due to changes in
the surface of stars related to rotation and activity. Therefore, we are able
to infer the surface (possibly differential) rotation rate. However,
instrumental perturbations can also produce artificial modulations in the light
curves that would mimic those of truly stellar origin. In this work we will
concentrate on Kepler observations in order to review an optimal way to extract
reliable surface rotation rates.


title: Approximating Minimum Cost Connectivity Orientation and Augmentation

abstract:
  We investigate problems addressing combined connectivity augmentation and
orientations settings. We give a polynomial-time 6-approximation algorithm for
finding a minimum cost subgraph of an undirected graph $G$ that admits an
orientation covering a nonnegative crossing $G$-supermodular demand function,
as defined by Frank. An important example is $(k,\ell)$-edge-connectivity, a
common generalization of global and rooted edge-connectivity.
  Our algorithm is based on a non-standard application of the iterative
rounding method. We observe that the standard linear program with cut
constraints is not amenable and use an alternative linear program with
partition and co-partition constraints instead. The proof requires a new type
of uncrossing technique on partitions and co-partitions.
  We also consider the problem setting when the cost of an edge can be
different for the two possible orientations. The problem becomes substantially
more difficult already for the simpler requirement of $k$-edge-connectivity.
Khanna, Naor, and Shepherd showed that the integrality gap of the natural
linear program is at most $4$ when $k=1$ and conjectured that it is constant
for all fixed $k$. We disprove this conjecture by showing an $\Omega(|V|)$
integrality gap even when $k=2$.


title: A Comparative Study of CPU Scheduling Algorithms

abstract:
  Developing CPU scheduling algorithms and understanding their impact in
practice can be difficult and time consuming due to the need to modify and test
operating system kernel code and measure the resulting performance on a
consistent workload of real applications. As processor is the important
resource, CPU scheduling becomes very important in accomplishing the operating
system (OS) design goals. The intention should be allowed as many as possible
running processes at all time in order to make best use of CPU. This paper
presents a state diagram that depicts the comparative study of various
scheduling algorithms for a single CPU and shows which algorithm is best for
the particular situation. Using this representation, it becomes much easier to
understand what is going on inside the system and why a different set of
processes is a candidate for the allocation of the CPU at different time. The
objective of the study is to analyze the high efficient CPU scheduler on design
of the high quality scheduling algorithms which suits the scheduling goals. Key
Words:-Scheduler, State Diagrams, CPU-Scheduling, Performance


title:
Quark-Meson Coupling Model, Nuclear Matter Constraints and Neutron Star
  Properties

abstract:
  We explore the equation of state for nuclear matter in the quark-meson
coupling model, including full Fock terms. The comparison with phenomenological
constraints can be used to restrict the few additional parameters appearing in
the Fock terms which are not present at Hartree level. Because the model is
based upon the in-medium modification of the quark structure of the bound
hadrons, it can be applied without additional parameters to include hyperons
and to calculate the equation of state of dense matter in beta-equilibrium.
This leads naturally to a study of the properties of neutron stars, including
their maximum mass, their radii and density profiles.


abstract:
  The main objective of this paper is to improve the Round Robin scheduling
algorithm using the dynamic time slice concept. CPU scheduling becomes very
important in accomplishing the operating system (OS) design goals. The
intention should be allowed as many as possible running processes at all time
in order to make best use of CPU. CPU scheduling has strong effect on resource
utilization as well as overall performance of the system. Round Robin algorithm
performs optimally in time-shared systems, but it is not suitable for soft real
time systems, because it gives more number of context switches, larger waiting
time and larger response time. In this paper, a new CPU scheduling algorithm
called An Optimum Multilevel Dynamic Round Robin Scheduling Algorithm is
proposed, which calculates intelligent time slice and changes after every round
of execution. The suggested algorithm was evaluated on some CPU scheduling
objectives and it was observed that this algorithm gave good performance as
compared to the other existing CPU scheduling algorithms.


title:
Enigmatic 4/11 State: A Prototype for Unconventional Fractional Quantum
  Hall Effect

abstract:
  The origin of fractional quantum Hall effect (FQHE) at 4/11 and 5/13 has
remained controversial. We make a compelling case that FQHE is possible here
for fully spin polarized composite fermions, but with an unconventional
underlying physics. Thanks to a rather unusual interaction between composite
fermions, FQHE here results from the suppression of pairs with relative angular
momentum {\em three} rather than one, confirming the exotic mechanism proposed
by W\'ojs, Yi and Quinn [Phys. Rev. B {\bf 69}, 205322 (2004)]. We predict that
the 4/11 state reported a decade ago by Pan {\em et al.} [Phys. Rev. Lett. {\bf
90}, 016801 (2003)] is a conventional partially spin polarized FQHE of
composite fermions, and estimate the Zeeman energy where a phase transition
into the unconventional fully spin polarized state will occur.


title:
Small-scale Gradients of Charged Particles in the Heliospheric Magnetic
  Field

abstract:
  Using numerical simulations of charged-particles propagating in the
heliospheric magnetic field, we study small-scale gradients, or "dropouts", in
the intensity of solar energetic particles seen at 1 AU. We use two turbulence
models, the foot-point random motion model (Jokipii & Parker 1969; Giacalone et
al. 2006) and two-component model (Matthaeus et al. 1990), to generate
fluctuating magnetic fields similar to spacecraft observations at 1 AU. The
turbulence models include a Kolmogorov-like magnetic field power spectrum
containing a broad range of spatial scales from those that lead to large-scale
field-line random walk to small scales leading to resonant pitch-angle
scattering of energetic particles. We release energetic protons (20 keV - 10
MeV) from a spatially compact and instantaneous source. The trajectories of
energetic charged particles in turbulent magnetic fields are numerically
integrated. Spacecraft observations are mimicked by collecting particles in
small windows when they pass the windows at a distance of 1 AU. We show that
small-scale gradients in the intensity of energetic particles and velocity
dispersions observed by spacecraft can be reproduced using the foot-point
random motion model. However, no dropouts is seen in simulations using the
two-component magnetic turbulence model. We also show that particle scattering
in the solar wind magnetic field needs to be infrequent for intensity dropouts
to form.


title:
Nonmagnetic impurity resonance states as a test of superconducting
  pairing symmetry in CeCoIn$_{5}$

abstract:
  We theoretically study the effect of a nonmagnetic impurity in heavy fermion
superconductor CeCoIn$_{5}$ within a realistic band model and the T-matrix
approximation approach. By considering two known possible pairing symmetry
candidates $d_{x^{2}-y^{2}}$ and $d_{xy}$, we find that although both total
density of states exhibit a similar V-shaped gaplike feature, only the
$d_{x^{2}-y^{2}}$-wave pairing symmetry gives rise to robust intragap impurity
resonance states reflected by the resonance peaks near the Fermi energy in the
local density of states. These features can be readily probed by scanning
tunneling microscopy experiments, and are proposed to shed light on the pairing
symmetry and provide hints on the microscopic mechanism of unconventional
superconductivity in the Ce-based heavy fermion superconductors.


title:
Human Brain Mapping based on COLD Signal Hemodynamic Response and
  Electrical Neuroimaging

abstract:
  To understand Working of Human Brain measurements related to the brain
function are required. These measurements should be possibly non-invasive.
Brain should be disturbed as less as possible during the measurement.
Integration of various modalities plays a vital role in understanding the
cognitive and the behavioral changes in the human brain. It is an important
source of converging evidence about specific aspects of neural functions and
dysfunctions under certain pathological conditions. Focal changes in cortical
blood flow are tightly coupled with the changes in neuronal activity. This
constitutes the option to map the hemodynamic response and infer principles of
the cortical processing, even of complex tasks. The very high temporal
resolution of EEG and good spatial resolution by NIRS make this concurrent
measurement unique to study the spatio-temporal dynamics of large scale
neuronal networks in the human brain. Such integration of two techniques will
help to overcome the limitations of a specific method. Such as insensitivity of
electroencephalogram (EEG) to unsynchronized neural events or lack of near
infrared spectroscopy (NIRS) to low metabolic demand. A combination of EEG and
NIRS will be more informative than the two separate analyses in both
modalities.


title:
Magellanic Cloud stars with TiO bands in emission: binary post-RGB/AGB
  stars or young stellar objects?

abstract:
  Fourteen stars from a sample of Magellanic Cloud objects selected to have a
mid-infrared flux excess have been found to also show TiO bands in emission.
The mid-infrared dust emission and the TiO band emission indicate that these
stars have large amounts of hot circumstellar dust and gas in close proximity
to the central star. The luminosities of the sources are typically several
thousand L_sun while the effective temperatures are 4000-8000 K. Such stars
could be post-AGB stars of mass 0.4-0.8 M_sun or pre-main-sequence stars (young
stellar objects) with masses of 7-19 M_sun. If the stars are pre-main-sequence
stars, they are substantially cooler and younger than stars at the birth line
where Galactic protostars are first supposed to become optically visible out of
their molecular clouds. They should therefore be hidden in their present
evolutionary state. The second explanation for these stars is that they are
post-AGB or post-RGB stars that have recently undergone a binary interaction
when the red giant of the binary system filled its Roche lobe. Being
oxygen-rich, they have gone through this process before becoming carbon stars.
Most of the stars vary slowly on timescales of 1000 days or more suggesting a
changing circumstellar environment. Apart from the slow variations, most stars
also show variability with periods of tens to hundreds of days. One star shows
a period that is rapidly decreasing and we speculate that this star may have
accreted a large blob of gas and dust onto a disk whose orbital radius is
shrinking rapidly. Another star has Cepheid-like pulsations of rapidly
increasing amplitude suggesting a rapid rate of evolution. Seven stars show
quasi-periodic variability and one star has a light curve similar to that of an
eclipsing binary.


title:
Stochastic integration for fractional Levy process and stochastic
  differential equation driven by fractional Levy noise

abstract:
  In this paper, based on the white noise analysis of square integrable
pure-jump Levy process given by [1], we define the formal derivative of
fractional Levy process defined by the square integrable pure-jump Levy process
as the fractional Levy noises by considering fractional Levy process as the
generalized functional of Levy process, and then we define the Skorohod
integral with respect to the fractional Levy process. Moreover, we propose a
class of stochastic Volterra equations driven by fractional Levy noises and
investigate the existence and uniqueness of their solutions; In addition, we
propose a class of stochastic differential equations driven by fractional Levy
noises and prove that under the Lipschtz and linear conditions there exists
unique stochastic distribution-valued solution.

categories: math.PR math-ph math.DS math.MP math.ST stat.TH


title: Ontology Based Feature Driven Development Life Cycle

abstract:
  The upcoming technology support for semantic web promises fresh directions
for Software Engineering community. Also semantic web has its roots in
knowledge engineering that provoke software engineers to look for application
of ontology applications throughout the Software Engineering life cycle. The
internal components of a semantic web are light weight and may be of less
quality standards than the externally visible modules. In fact the internal
components are generated from external (ontological) component. That is the
reason agile development approaches such as feature driven development are
suitable for applications internal component development. As yet there is no
particular procedure that describes the role of ontology in the processes.
Therefore we propose an ontology based feature driven development for semantic
web application that can be used form application model development to feature
design and implementation. Features are precisely defined in the OWL-based
domain model. Transition from OWL based domain model to feature list is
directly defined in transformation rules. On the other hand the ontology based
overall model can be easily validated through automated tools. Advantages of
ontology-based feature Driven development are also discussed.


title:
Polaron-bipolaron superconductivity and the intrinsic pairing symmetry
  in cuprate superconductors

abstract:
  We have calculated the tunneling conductance of a
superconductor-insulator-superconductor junction based on the polaron-bipolaron
theory of superconductivity. The predicted incoherent hump features are in
quantitative agreement with tunneling spectra of optimally doped
Bi2Sr2CaCu2O8+y and Bi2Sr2Ca2Cu3O10+y. We further show that angle-resolved
photoemission spectra of underdoped cuprates are consistent with the
Bose-Einstein condensation of inter-site bipolarons and that the
superconducting gap symmetry is d-wave, which is determined by the anomalous
kinetic process rather than by the pairing interaction. In the overdoped
cuprates (BCS-like superconductors), the superconducting gap symmetry is the
same as the pairing symmetry, which is found to be extended s-wave with eight
line nodes in hole-doped cuprates and nodeless s-wave in electron-doped
cuprates. The polaronic effect significantly enhances the density of states at
the Fermi level and the effective electron-phonon coupling constant for
low-energy phonon modes, which is the key to the understanding of
high-temperature superconductivity.


title: Full Counting Statistics of Andreev Tunneling

abstract:
  We employ a single-charge counting technique to measure the full counting
statistics (FCS) of Andreev events in which Cooper pairs are either produced
from electrons that are reflected as holes at a superconductor/normal-metal
interface or annihilated in the reverse process. The FCS consists of quiet
periods with no Andreev processes, interrupted by the tunneling of a single
electron that triggers an avalanche of Andreev events giving rise to strongly
super-Poissonian distributions.

categories: cond-mat.mes-hall cond-mat.supr-con physics.data-an quant-ph


title: Direct model fitting to combine dithered ACS images

abstract:
  The information lost in images of undersampled CCD cameras can be recovered
with the technique of `dithering'. A number of subexposures is taken with
sub-pixel shifts in order to record structures on scales smaller than a pixel.
The standard method to combine such exposures, `Drizzle', averages after
reversing the displacements, including rotations and distortions. More
sophisticated methods are available to produce, e.g., Nyquist sampled
representations of band-limited inputs. While the combined images produced by
these methods can be of high quality, their use as input for forward-modelling
techniques in gravitational lensing is still not optimal, because the residual
artefacts still affect the modelling results in unpredictable ways. In this
paper we argue for an overall modelling approach that takes into account the
dithering and the lensing without the intermediate product of a combined image.
As one building block we introduce an alternative approach to combine dithered
images by direct model fitting with a least-squares approach including a
regularization constraint. We present tests with simulated and real data that
show the quality of the results. The additional effects of gravitational
lensing and the convolution with an instrumental point spread function can be
included in a natural way, avoiding the possible systematic errors of previous
procedures.


title:
High-Resolution Scanning Tunneling Spectroscopy of Vortex Cores in
  Inhomogeneous Electronic States of Bi2Sr2CaCu2Ox

abstract:
  We studied electronic states in vortex cores of slightly overdoped
Bi2Sr2CaCu2Ox by scanning tunneling spectroscopy. We have found that they have
stripe structures with a 4a0 width extending along the Cu-O bond directions.
Vortex core states are observed as two peaks at particle-hole symmetric
positions in the energy gap. Along a stripe, the peak positions of vortex core
states are constant and not influenced by the spatial variation of the energy
gap \Delta. Outer stripes have a larger energy than inner stripes. A mazelike
pattern in the electronic states at E = +-\Delta has been observed all over the
surface both inside and outside the vortex core. The orientation of stripes of
vortex core states was found to be related to the mazelike pattern in the
vortex core region. A short-range order of the mazelike pattern spatially
coexists with the superconductivity and locally breaks the symmetry of the two
Cu-O bond directions. We propose that the vortex core bound states are formed
by Bogoliubov quasiparticles owing to the depairing of Cooper pairs and have a
local C2 symmetry influenced by the short-range order of the mazelike pattern.


title:
Clifford algebra and the projective model of Minkowski
  (pseudo-Euclidean) spaces

abstract:
  I apply the algebraic framework introduced in arXiv:1101.4542v3[math.MG] to
Minkowski (pseudo-Euclidean) spaces in 2, 3, and 4 dimensions. The exposition
follows the template established in arXiv:1307.2917[math.MG] for Euclidean
spaces. The emphasis is on geometric structures, but some contact with special
relativity is made by considering relativistic addition of velocities and
Lorentz transformations, both of which can be seen as rotation applied to
points and to lines. The language used in the paper reflects the emphasis on
geometry, rather than applications to special relativity. The use of Clifford
algebra greatly simplifies the study of Minkowski spaces, since unintuitive
synthetic techniques are replaced by algebraic calculations.


title:
Flux through a time-periodic gate: Monte Carlo test of a homogenization
  result

abstract:
  We investigate via Monte Carlo numerical simulations and theoretical
considerations the outflux of random walkers moving in an interval bounded by
an interface exhibiting channels (pores, doors) which undergo an open/close
cycle according to a periodic schedule. We examine the onset of a limiting
boundary behavior characterized by a constant ratio between the outflux and the
local density, in the thermodynamic limit. We compare such a limit with the
predictions of a theoretical model already obtained in the literature as the
homogenization limit of a suitable diffusion problem.


title: A test of the Suyama-Yamaguchi inequality from weak lensing

abstract:
  We investigate the weak lensing signature of primordial non-Gaussianities of
the local type by constraining the magnitude of the weak convergence bi- and
trispectra expected for the EUCLID weak lensing survey. Starting from
expressions for the weak convergence spectra, bispectra and trispectra, whose
relative magnitudes we investigate as a function of scale, we compute their
respective signal to noise ratios by relating the polyspectra's amplitude to
their Gaussian covariance using a Monte-Carlo technique for carrying out the
configuration space integrations. In computing the Fisher-matrix on the
non-Gaussianity parameters f_nl, g_nl and tau_nl with a very similar technique,
we can derive Bayesian evidences for a violation of the Suyama-Yamaguchi
relation tau_nl>=(6 f_nl/5)^2 as a function of the true f_nl and tau_nl-values
and show that the relation can be probed down to levels of f_nl~10^2 and
tau_nl~10^5. In a related study, we derive analytical expressions for the
probability density that the SY-relation is exactly fulfilled, as required by
models in which any one field generates the perturbations. We conclude with an
outlook on the levels of non-Gaussianity that can be probed with tomographic
lensing surveys.


title:
Boosting work characteristics and overall heat engine performance via
  shortcuts to adiabaticity: quantum and classical systems

abstract:
  Under a general framework, shortcuts to adiabatic processes are shown to be
possible in classical systems. We then study the distribution function of the
work done on a small system initially prepared at thermal equilibrium. It is
found that the work fluctuations can be significantly reduced via shortcuts to
adiabatic processes. For example, in the classical case probabilities of having
very large or almost zero work values are suppressed. In the quantum case
negative work may be totally removed from the otherwise non-positive-definite
work values. We also apply our findings to a micro Otto-cycle-based heat
engine. It is shown that the use of shortcuts, which directly enhances the
engine output power, can also increase the heat engine efficiency
substantially, in both quantum and classical regimes.


title: Statistical distribution of bonding distances in a unidimensional solid

abstract:
  We study a Fermi-Pasta-Ulam-like chain with realistic potentials, which
models a unidimensional solid in contact with heat baths at some temperature.
We formulate an explicit analytical expression for the probability density of
bonding distances between neighbor particles, which depends on temperature
similarly to the distribution of velocities. Its validity is verified with a
striking accuracy through simulations.


title: Classical Inversion of the CHSH Inequality

abstract:
  In general, the CHSH inequality $S \le 2$ is considered to provide an
\textit{upper} bound for classical correlations. In this note it is shown that
if incoming particles are allowed to be delayed ever so briefly, the inequality
can be inverted to $S \ge 2$ thus becoming a \textit{lower} bound for classical
correlations (maximum S=3). All interaction is strictly local and events are
neither dropped nor re-sequenced thus strictly conforming to the standard CHSH
setup. The key notion is that a (brief) delay in front of a detector is not a
causative intervention.


title: Squeezing light with Majorana fermions

abstract:
  Coupling a semiconducting nanowire to a microwave cavity provides a powerfull
means to assess the presence or absence of isolated Majorana fermions in the
nanowire. These exotic bound states can cause a significant cavity frequency
shift but also a strong cavity nonlinearity leading for instance to light
squeezing. The dependence of these effects on the nanowire gate voltages gives
direct signatures of the unique properties of Majorana fermions, such as their
self-adjoint character and their exponential confinement.


title: A Brief Review of Nature-Inspired Algorithms for Optimization

abstract:
  Swarm intelligence and bio-inspired algorithms form a hot topic in the
developments of new algorithms inspired by nature. These nature-inspired
metaheuristic algorithms can be based on swarm intelligence, biological
systems, physical and chemical systems. Therefore, these algorithms can be
called swarm-intelligence-based, bio-inspired, physics-based and
chemistry-based, depending on the sources of inspiration. Though not all of
them are efficient, a few algorithms have proved to be very efficient and thus
have become popular tools for solving real-world problems. Some algorithms are
insufficiently studied. The purpose of this review is to present a relatively
comprehensive list of all the algorithms in the literature, so as to inspire
further research.


title:
X-Ray and Gamma-Ray Polarization in Leptonic and Hadronic Jet Models of
  Blazars

abstract:
  We present a theoretical analysis of the expected X-ray and gamma-ray
polarization signatures resulting from synchrotron self-Compton emission in
leptonic models, compared to the polarization signatures from proton
synchrotron and cascade synchrotron emission in hadronic models for blazars.
Source parameters resulting from detailed spectral-energy-distribution modeling
are used to calculate photon-energy-dependent upper limits on the degree of
polarization, assuming a perfectly organized, mono-directional magnetic field.
In low-synchrotron-peaked blazars, hadronic models exhibit substantially higher
maximum degrees of X-ray and gamma-ray polarization than leptonic models, which
may be within reach for existing X-ray and gamma-ray polarimeters. In
high-synchrotron-peaked blazars (with electron-synchrotron-dominated X-ray
emission), leptonic and hadronic models predict the same degree of X-ray
polarization, but substantially higher maximum gamma-ray polarization in
hadronic models than leptonic ones. These predictions are particularly relevant
in view of the new generation of balloon-borne X-ray polarimeters (and possibly
GEMS, if revived), and the ability of Fermi-LAT to measure gamma-ray
polarization at < 200 MeV. We suggest observational strategies combining
optical, X-ray, gamma-ray polarimetry to determine the degree of ordering of
the magnetic field and to distinguish between leptonic and hadronic high-energy
emission.


title: Heat trace and spectral action on the standard Podles sphere

abstract:
  We give a new definition of dimension spectrum for non-regular spectral
triples and compute the exact (i.e. non only the asymptotics) heat-trace of
standard Podles spheres $S^2_q$ for $0<q<1$, study its behavior when $q\to 1$
and fully compute its exact spectral action for an explicit class of cut-off
functions.


title:
Single-Mirror Small-Size Telescope structure for the Cherenkov Telescope
  Array

abstract:
  A single-mirror small-size (1M-SST) Davies-Cotton telescope has been proposed
for the southern observatory of the Cherenkov Telescope Array (CTA) by a
consortium of scientific institutions from Poland, Switzerland, and Germany.
The telescope has a 4 m diameter reflector and will be equipped with a fully
digital camera based on Geiger avalanche photodiodes (APDs). Such a design is
particularly interesting for CTA because it represents a very simple, reliable,
and cheap solution for a SST. Here we present the design and the
characteristics of the mechanical structure of the 1M-SST telescope and its
drive system. We also discuss the results of a finite element method analysis
in order to demonstrate the conformance of the design with the CTA
specifications and scientific objectives. In addition, we report on the current
status of the construction of a prototype telescope structure at the Institute
of Nuclear Physics PAS in Krakow.


title: SPI Measurements of Nucleosynthesis Gamma-Rays

abstract:
  Studies based on the gamma-ray lines from radioactive decay of unstable
isotopes produced in massive-star and supernova nucleosynthesis have been among
INTEGRAL's prominent science achievements. 26Al has become a tool to study
specific source regions, such as massive-star groups and associations in nearby
regions which can be discriminated from the galactic-plane background, and the
inner Galaxy where Doppler shifted lines add to the astronomical information.
60Fe is co-produced by the sources of 26Al, and the isotopic ratio from their
nucleosynthesis encodes stellar-structure information. Here we summarize latest
results using the accumulated multi-year database of observations, point to the
relevant publications, and discuss their astrophysical implications.


title:
Estimating the number of disjoint edges in simple topological graphs via
  cylindrical drawings

abstract:
  A topological graph drawn on a cylinder whose base is horizontal is
\emph{angularly monotone} if every vertical line intersects every edge at most
once. Let $c(n)$ denote the maximum number $c$ such that every simple angularly
monotone drawing of a complete graph on $n$ vertices contains at least $c$
pairwise disjoint edges. We show that for every simple complete topological
graph $G$ there exists $\Delta$, $0<\Delta<n$, such that $G$ contains at least
$\max \{\frac n\Delta, c(\Delta)\}$ pairwise disjoint edges. By combining our
result with a result of T\'oth we obtain an alternative proof for the best
known lower bound of $\Omega(n^\frac 13)$ on the maximum number of pairwise
disjoint edges in a simple complete topological graph proved by Suk. Our proof
is based on a result of Ruiz-Vargas.


title: A Lattice for Persistence

abstract:
  The intrinsic connection between lattice theory and topology is fairly well
established, For instance, the collection of open subsets of a topological
subspace always forms a distributive lattice. Persistent homology has been one
of the most prominent areas of research in computational topology in the past
20 years. In this paper we will introduce an alternative interpretation of
persistence based on the study of the order structure of its correspondent
lattice. Its algorithmic construction leads to two operations on homology
groups which describe a diagram of spaces as a complete Heyting algebra, which
is a generalization of a Boolean algebra. We investigate some of the properties
of this lattice, the algorithmic implications of it, and some possible
applications.


title: Statistical pairing fluctuation and phase transition in $^{94}Mo$

abstract:
  In the framework of BCS model, we have applied the isothermal probability
distribution to take into account the statistical fluctuations in calculation
of thermodynamical properties of nuclei. The energy and the heat capacity are
calculated in $^{94}Mo$ nucleus using the mean gap parameter. The results are
compared with the values obtained based on the most probable values,
experimental data as well as some other theoretical models. We have shown that
heat capacity versus temperature behaves smoothly instead of singular behaviour
predicted by the standard BCS model. Also a smooth peak in heat capacity is
observed which is a signature of transition from normal to super fluid phase.


title: A Proof of Factorization Theorem of Drell-Yan Process at Operator Level

abstract:
  An alternative proof of factorization theorem for Drell-Yan process that
works at operator level is given in the article. Final state interactions for
such inclusive processes are proved to be cancel out at operator level
according to the unitarity of time evolution operator. After this cancellation,
one can always deform the integral path so that eikonal line approximation
works while calculating the time evolution of electromagnetic currants.
Decoupling of soft gluons from collinear jets is realized by defining new
collinear fields that decouple from soft gluons. Cancelation of soft gluons is
attribute to unitarity of time evolution operator and light-like Wilson lines
of soft gluons.


title: Modified Dispersion Relation, Photon's Velocity, and Unruh Effect

abstract:
  Motivated by the recently derived new form of generalized uncertainty
principle we obtain the corresponding dispersion relation which is now
modified. This modification can be interpreted as a possible mechanism that
makes particles more massive. In addition, the modified velocity of photons is
obtained and indicates that photons' propagation depends on their energy, thus
superluminal photons are permitted due to generalized uncertainty principle.
Furthermore, we derive and solve the two-dimensional Klein-Gordon equation in
the presence of GUP corrections, and therefore the GUP-corrected emission
spectrum due to the Unruh effect is obtained.


title: A stability criterion for high-frequency oscillations

abstract:
  We show that a simple Levi compatibility condition determines stability of
WKB solutions to semilinear hyperbolic initial-value problems issued from
highly-oscillating initial data with large amplitudes. The compatibility
condition involves the hyperbolic operator, the fundamental phase associated
with the initial oscillation, and the semilinear source term; it states roughly
that hyperbolicity is preserved around resonances.
  If the compatibility condition is satisfied, the solutions are defined over
time intervals independent of the wavelength, and the associated WKB solutions
are stable under a large class of initial perturbations. If the compatibility
condition is not satisfied, resonances are exponentially amplified, and
arbitrarily small initial perturbations can destabilize the WKB solutions in
small time.
  The amplification mechanism is based on the observation that in frequency
space, resonances correspond to points of weak hyperbolicity. At such points,
the behavior of the system depends on the lower order terms through the
compatibility condition.
  The analysis relies, in the unstable case, on a short-time Duhamel
representation formula for solutions of zeroth-order pseudo-differential
equations.
  Our examples include coupled Klein-Gordon systems, and systems describing
Raman and Brillouin instabilities.


title: The automorphism group of the singular K3 surface of discriminant 7

abstract:
  We give a system of generators of the automorphism group of the singular $K3$
surface of discriminant 7. This system of generators consists of the inversion
involutions of some elliptic fibrations with a section together with ${\rm
PGL}_2(7)$.


title: Cosmic Gamma-Ray Spectroscopy

abstract:
  Gamma-ray instrumentation for astronomical spectroscopy consists of
multiple-interaction detectors in space combined with sophisticated
post-processing of detector events on ground. Spectral signatures in the MeV
regime originate from transitions in the nuclei of atoms (rather than in their
electron shell). Nuclear transitions are stimulated by either radioactive
decays or high-energy nuclear collisions such as with cosmic rays. Gamma-ray
lines have been detected from radioactive isotopes produced in nuclear burning
inside stars and supernovae, and from energetic-particle interactions in solar
flares. 56Ni directly reflects the source of supernova light. The paucity of
corresponding 44Ti gamma-ray line sources reflects the variety of dynamical
conditions herein. 26Al and 60Fe are dispersed in interstellar space from
massive-star nucleosynthesis over millions of years. Gamma-rays from their
decay are measured in detail by gamma-ray telescopes, astrophysical
interpretations reach from massive-star interiors to dynamical processes in the
interstellar medium. Nuclear de-excitation gamma-ray lines have been found in
solar-flare events, and convey information about energetic-particle production
in these events, and their interaction in the solar atmosphere. The
annihilation of positrons leads to another type of cosmic gamma-ray source. The
characteristic annihilation gamma-rays at 511 keV have been measured long ago
in solar flares, and now throughout the interstellar medium of our Milky Way
galaxy. But now a puzzle has appeared, as a surprising predominance of the
central bulge region was determined. This requires either new positron sources
or transport processes not yet known to us. In this paper we discuss
instrumentation and data processing for cosmic gamma-ray spectroscopy, and the
astrophysical issues and insights from these measurements.


title:
First-principles thermodynamic screening approach to photo-catalytic
  water splitting with co-catalysts

abstract:
  We adapt the computational hydrogen electrode approach to explicitly account
for photo-generated charges and use it to computationally screen for viable
catalyst/co-catalyst combinations for photo-catalytic water splitting. The hole
energy necessary to thermodynamically drive the reaction is employed as
descriptor for the screening process. Using this protocol and hybrid-level
density-functional theory we show that water oxidation on bare TiO2 surfaces is
thermodynamically more complex than previously thought. This motivates a
screening for suitable co-catalysts for this half-reaction, which we carry out
for Au particles down to the non-scalable size regime. We find that almost all
small Au clusters studied are better suited for water photo-oxidation than an
extended Au(111) surface or bare TiO2 facets.


title:
Highly asymmetric electrolytes in the primitive model: Hypernetted chain
  solution in arbitrary spatial dimensions

abstract:
  The pair-correlation functions for fluid ionic mixtures in arbitrary spatial
dimensions are computed in hypernetted chain (HNC) approximation. In the
primitive model, all ions are approximated as non-overlapping hyperspheres with
Coulomb interactions. Our spectral HNC solver is based on a Fourier-Bessel
transform introduced by Talman [J. Comput. Phys., 29, 35 (1978)], with
logarithmically spaced computational grids. Numeric efficiency for arbitrary
spatial dimensions is a commonly exploited virtue of this transform method.
Here, we highlight another advantage of logarithmic grids, consisting in
efficient sampling of pair-correlation functions for highly asymmetric ionic
mixtures. For three-dimensional fluids, ion size- and charge-ratios larger than
one thousand can be treated, corresponding to hitherto computationally not
accessed micrometer-sized colloidal spheres in 1-1 electrolyte. Effective
colloidal charge numbers are extracted from our primitive model results. For
moderately large ion size- and charge-asymmetries, we present Molecular
Dynamics simulation results that agree well with the approximate HNC pair
correlations.


title: Effect algebras with state operator

abstract:
  State operators on convex effect algebras, in particular effect algebras of
unital JC-algebras, JW-algebras and convex sigma-MV algebras are studied and
their relations with conditional expectations in algebraic sense as well as in
the sense of probability on MV-algebras are shown.


title:
Clusterized nuclear matter in the (proto-)neutron star crust and the
  symmetry energy

abstract:
  Though generally agreed that the symmetry energy plays a dramatic role in
determining the structure of neutron stars and the evolution of core-collapsing
supernovae, little is known in what concerns its value away from normal nuclear
matter density and, even more important, the correct definition of this
quantity in the case of unhomogeneous matter. Indeed, nuclear matter
traditionally addressed by mean-field models is uniform while clusters are
known to exist in the dilute baryonic matter which constitutes the main
component of compact objects outer shells. In the present work we investigate
the meaning of symmetry energy in the case of clusterized systems and the
sensitivity of the proto-neutron star composition and equation of state to the
effective interaction. To this aim an improved Nuclear Statistical Equilibrium
(NSE) model is developed, where the same effective interaction is consistently
used to determine the clusters and unbound particles energy functionals in the
self-consistent mean-field approximation. In the same framework, in-medium
modifications to the cluster energies due to the presence of the nuclear gas
are evaluated. We show that the excluded volume effect does not exhaust the
in-medium effects and an extra isospin and density dependent energy shift has
to be considered to consistently determine the composition of subsaturation
stellar matter. The symmetry energy of diluted matter is seen to depend on the
isovector properties of the effective interaction, but its behavior with
density and its quantitative value are strongly modified by clusterization.


title: Continuous extension of conformal maps

abstract:
  For a simply connected domain $G$, let $\partial_{a}G$ be the set of
accessible points in $\partial G$ and let $\partial_{n} G=\partial
G-\partial_{a}G$. A point $a\in\partial G$ is called semi-unreachable if there
is a crosscut $J$ of $G$ and domains $U$ and $V$ such that $G-J=U\cup V$ and
$a\in(\partial_{n} U\cup\partial_{n} V)-J$. We use $\partial_{sn}G$ to denote
the set of semi-unreachable points. In this article we show that a univalent
analytic function $\psi$ from the unit disk $D$ onto $G$ extends continuously
to $\overline D$ if and only if $\partial_{sn}G=\emptyset$.
  As a consequence, we provide a very short and elementary proof for the Osgood
conjecture: if $G$ is a Jordan domain, then $\psi^{-1}$, the Riemann map,
extends to be a homeomorphism from $\overline G$ to $\overline D$.


title:
A setup for soft proton irradiation of X-ray detectors for future
  astronomical space missions

abstract:
  Protons that are trapped in the Earth's magnetic field are one of the main
threats to astronomical X-ray observatories. Soft protons, in the range from
tens of keV up to a few MeV, impinging on silicon X-ray detectors can lead to a
significant degradation of the detector performance. Especially in low earth
orbits an enhancement of the soft proton flux has been found. A setup to
irradiate detectors with soft protons has been constructed at the Van-de-Graaff
accelerator of the Physikalisches Institut of the University of T\"ubingen. Key
advantages are a high flux uniformity over a large area, to enable irradiations
of large detectors, and a monitoring system for the applied fluence, the beam
uniformity, and the spectrum, that allows testing of detector prototypes in
early development phases, when readout electronics are not yet available. Two
irradiation campaigns have been performed so far with this setup. The
irradiated detectors are silicon drift detectors, designated for the use
on-board the LOFT space mission. This paper gives a description of the
experimental setup and the associated monitoring system.


title:
Orbit classification in the meridional plane of a disk galaxy model with
  a spherical nucleus

abstract:
  We investigate the regular or chaotic nature of star orbits moving in the
meridional plane of an axially symmetric galactic model with a disk and a
spherical nucleus. We study the influence of some important parameters of the
dynamical system, such as the mass and the scale length of the nucleus, the
angular momentum or the energy, by computing in each case the percentage of
chaotic orbits, as well as the percentages of orbits of the main regular
resonant families. Some heuristic arguments to explain and justify the
numerically derived outcomes are also given. Furthermore, we present a new
method to find the threshold between chaos and regularity for both Lyapunov
Characteristic Numbers and SALI, by using them simultaneously.


title: Analysis of magnetic neutron-scattering data of two-phase ferromagnets

abstract:
  We have analyzed magnetic-field-dependent small-angle neutron scattering
(SANS) data of soft magnetic two-phase nanocomposite ferromagnets in terms of a
recent micromagnetic theory for the magnetic SANS cross section [D. Honecker
and A. Michels, Phys. Rev. B $\mathbf{87}$, 224426 (2013)]. The approach yields
a value for the average exchange-stiffness constant and provides the Fourier
coefficients of the magnetic anisotropy field and magnetostatic field, which is
related to jumps of the magnetization at internal interfaces.


title:
Branching-Time Model Checking Gap-Order Constraint Systems (Extended
  Version)

abstract:
  We consider the model checking problem for Gap-order Constraint Systems (GCS)
w.r.t. the branching-time temporal logic CTL, and in particular its fragments
EG and EF.
  GCS are nondeterministic infinitely branching processes described by
evolutions of integer-valued variables, subject to Presburger constraints of
the form $x-y\ge k$, where $x$ and $y$ are variables or constants and
$k\in\mathbb{N}$ is a non-negative constant.
  We show that EG model checking is undecidable for GCS, while EF is decidable.
In particular, this implies the decidability of strong and weak bisimulation
equivalence between GCS and finite-state systems.


title:
Quark tensor charge and electric dipole moment within the
  Schwinger-Dyson formalism

abstract:
  We calculate the tensor charge of the quark in the QCD-like theory in the
Landau gauge using the Schwinger-Dyson formalism. It is found that the dressed
tensor charge of the quark is significantly suppressed against the bare quark
contribution, and the result agrees qualitatively with the analyses in the
collinear factorization approach and lattice QCD. We also analyze the quark
confinement effect with the phenomenological strong coupling given by
Richardson, and find that this contribution is small. We show that the
suppression of the quark tensor charge is due to the superposition of the spin
flip of the quark arising from the successive emission of gluons which dress
the tensor vertex. We also consider the relation between the quark and the
nucleon electric dipole moments by combining with the simple constituent quark
model.


title:
Robust periodic stability implies uniform exponential stability of
  Markovian jump linear systems and random linear ordinary differential
  equations

abstract:
  In this paper we show that if a linear cocycle is robustly periodical stable
then it is uniformly stable.


title:
Heavy ion collisions in the 1A GeV regime: how well do we join up to
  astrophysics?

abstract:
  The derivation of information useful for understanding the physics inside
compact stars from HIC observations is a difficult task. Complications due to
finite size, different chemistry, non-adiabatic compression, incomplete
stopping and structural effects must be overcome. This can only be convincingly
achieved by a successful simulation of many experimental observables varying
incident energy, system size and isospin content. Using now available
systematic FOPI data in the SIS energy range we try to trace the path to take.


title: Analysis of $\alpha_s$ from the realization of quark-hadron duality

abstract:
  We present an analysis of the role of the running coupling constant at the
intersection of perturbative and nonperturbative QCD in the context of the
quark-hadron duality \`a la Bloom-Gilman. Our framework will be the unpolarized
structure function of the proton in the resonance region. We suggest that the
realization of duality is related to the inclusion of nonperturbative effects
at the level of the coupling constant. The outcome of our analysis is a smooth
transition from perturbative to nonperturbative QCD physics, embodied in the
running of the coupling constant at intermediate scales.


title: Generalised CP and $A_4$ Family Symmetry

abstract:
  We perform a comprehensive study of family symmetry models based on $A_4$
combined with the generalised CP symmetry $H_{\rm{CP}}$. We investigate the
lepton mixing parameters which can be obtained from the original symmetry
$A_4\rtimes H_{\rm{CP}}$ breaking to different remnant symmetries in the
neutrino and charged lepton sectors. We find that only one case is
phenomenologically viable, namely $G^{\nu}_{\rm{CP}}\cong Z^{S}_2\times
H^{\nu}_{\rm{CP}}$ in the neutrino sector and $G^{l}_{\rm{CP}}\cong
Z^{T}_3\rtimes H^{l}_{\rm{CP}}$ in the charged lepton sector, leading to the
prediction of no CP violation, namely $\delta_{CP}$ and the Majorana phases
$\alpha_{21}$ and $\alpha_{31}$ are all equal to either zero or $\pi$. We then
propose an effective supersymmetric model based on the symmetry $A_4\rtimes
H_{\rm{CP}}$ in which trimaximal lepton mixing is predicted together with
either zero CP violation or $\delta_{CP}\simeq\pm \pi/2$ with non-trivial
Majorana phases. An ultraviolet completion of the effective model yields a
neutrino mass matrix which depends on only three real parameters. As a result
of this, all three CP phases and the absolute neutrino mass scale are
determined, the atmospheric mixing angle is maximal, and the Dirac CP can
either be preserved with $\delta_{CP}=0,\pi$ or maximally broken with
$\delta_{CP}=\pm \pi /2$ and sharp predictions for the Majorana phases and
neutrinoless double beta decay.


title: Locus of the centers of Meusnier spheres in Euclidean 3-space

abstract:
  In this study, we investigate the locus of the centers of the Meusnier
spheres. Just as focal curve is the locus of the centers of the osculating
spheres, we investigate the geometrical interpretation on the locus of the
centers of the Meusnier spheres. We proved that if the curve is a principal
line, the locus of the centers of the Meusnier spheres of the curve is an
evolute curve. Then, we give the relations between this evolute curve and the
focal curve. Also, we give some relations between helices, slant helices and
the locus of the centers of the Meusnier spheres of the curve.


title:
Review of simulating four classes of window materials for daylighting
  with non-standard BSDF using the simulation program Radiance

abstract:
  This review describes the currently available simulation models for window
material to calculate daylighting with the program "Radiance". The review is
based on four abstract and general classes of window materials, depending on
their scattering and redirecting properties (bidirectional scatter distribution
function, BSDF). It lists potential and limits of the older models and includes
the most recent additions to the software. All models are demonstrated using an
exemplary indoor scene and two typical sky conditions. It is intended as
clarification for applying window material models in project work or teaching.
The underlying algorithmic problems apply to all lighting simulation programs,
so the scenarios of materials and skies are applicable to other lighting
programs.


title: Design of a small-scale prototype for research in airborne wind energy

abstract:
  Airborne wind energy is a new renewable technology that promises to deliver
electricity at low costs and in large quantities. Despite the steadily growing
interest in this field, very limited results with real-world data have been
reported so far, due to the difficulty faced by researchers when realizing an
experimental setup. Indeed airborne wind energy prototypes are mechatronic
devices involving many multidisciplinary aspects, for which there are currently
no established design guidelines. With the aim of making research in airborne
wind energy accessible to a larger number of researchers, this work provides
such guidelines for a small-scale prototype. The considered system has no
energy generation capabilities, but it can be realized at low costs, used with
little restrictions and it allows one to test many aspects of the technology,
from sensors to actuators to wing design and materials. In addition to the
guidelines, the paper provides the details of the design and costs of an
experimental setup realized at the University of California, Santa Barbara, and
successfully used to develop and test sensor fusion and automatic control
solutions.


title: Single-mode subwavelength waveguides with wire metamaterials

abstract:
  We study the eigenmodes of a slab of a wire metamaterial and demonstrate that
such a waveguiding structure supports deep-subwavelength propagating modes
exhibiting properties of a single-mode waveguide at any fixed frequency below
the plasma frequency of metal wires. We compare our analytical results with the
dispersion relations extracted from the experimental measurements.


title:
PORTA: A three-dimensional multilevel radiative transfer code for
  modeling the intensity and polarization of spectral lines with massively
  parallel computers

abstract:
  The interpretation of the intensity and polarization of the spectral line
radiation produced in the atmosphere of the Sun and of other stars requires
solving a radiative transfer problem that can be very complex, especially when
the main interest lies in modeling the spectral line polarization produced by
scattering processes and the Hanle and Zeeman effects. One of the difficulties
is that the plasma of a stellar atmosphere can be highly inhomogeneous and
dynamic, which implies the need to solve the non-equilibrium problem of the
generation and transfer of polarized radiation in realistic three-dimensional
(3D) stellar atmospheric models. Here we present PORTA, an efficient multilevel
radiative transfer code we have developed for the simulation of the spectral
line polarization caused by scattering processes and the Hanle and Zeeman
effects in 3D models of stellar atmospheres. The numerical method of solution
is based on the non-linear multigrid iterative method and on a novel
short-characteristics formal solver of the Stokes-vector transfer equation
which uses monotonic B\'ezier interpolation. Therefore, with PORTA the
computing time needed to obtain at each spatial grid point the self-consistent
values of the atomic density matrix (which quantifies the excitation state of
the atomic system) scales linearly with the total number of grid points.
Another crucial feature of PORTA is its parallelization strategy, which allows
us to speed up the numerical solution of complicated 3D problems by several
orders of magnitude with respect to sequential radiative transfer approaches,
given its excellent linear scaling with the number of available processors. The
PORTA code can also be conveniently applied to solve the simpler 3D radiative
transfer problem of unpolarized radiation in multilevel systems.