title:
Efficacy of Attack detection capability of IDPS based on it's deployment
  in wired and wireless environment

abstract:
  Intrusion Detection and/or Prevention Systems (IDPS) represent an important
line of defence against a variety of attacks that can compromise the security
and proper functioning of an enterprise information system. Along with the
widespread evolution of new emerging services, the quantity and impact of
attacks have continuously increased, attackers continuously find
vulnerabilities at various levels, from the network itself to operating system
and applications, exploit them to crack system and services. Network defence
and network monitoring has become an essential component of computer security
to predict and prevent attacks. Unlike traditional Intrusion Detection System
(IDS), Intrusion Detection and Prevention System (IDPS) have additional
features to secure computer networks. In this paper, we present a detailed
study of how deployment of an IDPS plays a key role in its performance and the
ability to detect and prevent known as well as unknown attacks. We categorize
IDPS based on deployment as Network-based, host-based, and Perimeter-based and
Hybrid. A detailed comparison is shown in this paper and finally we justify our
proposed solution, which deploys agents at host-level to give better
performance in terms of reduced rate of false positives and accurate detection
and prevention.


title: New variable stars in the field of open cluster NGC188

abstract:
  A photometric study of variable stars in the field of old open cluster NGC
188 is discussed. Observations were carried out in two bands R and I for 5513
stars up to R = 17 mag in the field of 1.5 x 1.5 grad. around the cluster. The
photometric data were processed by the console application "Astrokit", which
corrects brightness variations associated with the variability of atmospheric
transparency and carries out searching for variable stars. We found 18 new
variable stars and determined the parameters of one previously known variable.
Among discovered stars one is a low-amplitude pulsating variable, one is a EW
eclipsing binary, six are eclipsing variables of EA type, five objects are long
period variables, and for five stars variability type remains uncertain.


title: The group structure for jet bundles over Lie groups

abstract:
  The jet bundle $J^kG$ of $k$-jets of curves in a Lie group $G$ has a natural
Lie group structure. We present an explicit formula for the group
multiplication in the right trivialization and for the group 2-cocycle
describing the abelian Lie group extension $\mathfrak{g}\to J^{k}G\to
J^{k-1}G$.


title: Tunable band gap in few-layer graphene by surface adsorption

abstract:
  There is a tunable band gap in ABC-stacked few-layer graphene (FLG) via
applying a vertical electric field, but the operation of FLG-based field effect
transistor (FET) requires two gates to create a band gap and tune channel's
conductance individually. Using first principle calculations, we propose an
alternative scheme to open a band gap in ABC-stacked FLG namely via single-side
adsorption. The band gap is generally proportional to the charge transfer
density. The capability to open a band gap of metal adsorption decreases in
this order: K/Al > Cu/Ag/Au > Pt. Moreover, we find that even the band gap of
ABA-stacked FLG can be opened if the bond symmetry is broken. Finally, a
single-gated FET based on Cu-adsorbed ABC-stacked trilayer graphene is
simulated. A clear transmission gap is observed, which is comparable with the
band gap. This renders metal-adsorbed FLG a promising channel in a single-gated
FET device.


title: Dual pairs for non-abelian fluids

abstract:
  This paper is a rigorous study of two dual pairs of momentum maps arising in
the context of fluid equations whose configuration Lie group is the group of
automorphism of a trivial principal bundle, generically called here non-abelian
fluids. It is shown that the actions involved are mutually completely
orthogonal, which directly implies the dual pair property.


title: On behavior of pairs of Teichm\"{u}ller geodesic rays

abstract:
  In this paper, we obtain the explicit limit value of the Teichm\"{u}ller
distance between two Teichm\"{u}ller geodesic rays which are determined by
Jenkins-Strebel differentials having a common end point on the augmented
Teichm\"{u}ller space. Furthermore, we also obtain a condition under which
these two rays are asymptotic. This is similar to a result of Farb and Masur.


title: Harmonic morphisms and moment maps on hyper-K\"ahler manifolds

abstract:
  We characterise the actions, by holomorphic isometries on a K\"ahler manifold
with zero first Betti number, of an abelian Lie group of dim\geq 2, for which
the moment map is horizontally weakly conformal (with respect to some Euclidean
structure on the Lie algebra of the group). Furthermore, we study the
hyper-K\"ahler moment map $\phi$ induced by an abelian Lie group T acting by
triholomorphic isometries on a hyper-K\"ahler manifold M, with zero first Betti
number, thus obtaining the following: If dim T=1 then $\phi$ is a harmonic
morphism. Moreover, we illustrate this on the tangent bundle of the complex
projective space equipped with the Calabi hyper-K\"ahler structure, and we
obtain an explicit global formula for the map. If dim T\geq 2 and either $\phi$
has critical points, or M is nonflat and dim M=4 dim T then $\phi$ cannot be
horizontally weakly conformal.


title: SUSY Extended Higgs Sector and SUSY Strong Dynamics

abstract:
  We consider an extended Higgs sector that arises as a low-energy description
of a strongly-coupled SUSY gauge theory. This model predicts the presence of
extra superfields that couple with the Higgs superfields through large coupling
constants. Large radiative corrections involving the extra fields can realize
strongly first order electroweak phase transition, which is a vital requirement
for electroweak baryogenesis scenario. At the same time, the large radiative
corrections lead to significant deviations in the Higgs boson triple coupling
and Higgs-to-diphoton branching ratio, which are testable at the ILC.


title:
Multiple sign-changing and semi-nodal solutions for coupled Schrodinger
  equations

abstract:
  We study the following coupled Schr\"{o}dinger equations which have appeared
as several models from mathematical physics: \begin{displaymath}
\begin{cases}-\Delta u_1 +\la_1 u_1 = \mu_1 u_1^3+\beta u_1 u_2^2, \quad x\in
\Omega,\\ -\Delta u_2 +\la_2 u_2 =\mu_2 u_2^3+\beta u_1^2 u_2, \quad x\in
\Om,\\ u_1=u_2=0 \,\,\,\hbox{on \,$\partial\Om$}.\end{cases}\end{displaymath}
Here $\Om\subset\RN (N=2, 3)$ is a smooth bounded domain, $\la_1, \la_2$,
$\mu_1, \mu_2$ are all positive constants. We show that, for each
$k\in\mathbb{N}$ there exists $\bb_k>0$ such that this system has at least $k$
sign-changing solutions (i.e., both two components change sign) and $k$
semi-nodal solutions (i.e., one component changes sign and the other one is
positive) for each fixed $\bb\in (0, \bb_k)$.


title: Tumor can originate from not only rare cancer stem cells

abstract:
  Tumors are believed to consist of a heterogeneous population of tumor cells
originating from rare cancer stem cells (CSCs). However, emerging evidences
show that tumor may also originate from non-CSCs. Here, we give evidences
supporting that the number of tumorigenic tumor cells is higher than the number
of CSCs and tumor can also derive from non-CSCs. First, we applied an idealized
mathematical model and theoretically calculated that non-CSCs could initiate
tumor if their proliferation potential was adequate. Next, we demonstrated by
experimental studies that 17.7%, 38.6% and 5.2% of tumor cells in murine B16
solid melanoma, H22 hepatoma and Lewis lung carcinoma, respectively, were
potentially tumorigenic. We propose that the rare CSCs, if exist, are not the
only origination of a tumor.


title: Giant birefringence in layered compound LaOBiS2

abstract:
  Birefringent crystals (BFC) have been extensively used in imaging
spectrometer, laser devices, and optical components. Seeking new BFC is of
important for both fundamental research and industrial application. Employed
first-principles density functional theory (DFT), we found that LaOBiS2 (space
group P4/nmm), the parent phase of recently discovered BiS2-superconductor,
exhibits superior birefringence with a maximum value of 2.94, which is 13.4
times larger than the extensively used YVO4 (0.22). Furthermore, LaOBiS2 is an
indirect semiconductor with a band-gap of 0.9 eV, which is suitable for optical
applications. The origin of giant inherent birefringence is discussed.


title: V2494 Cyg: A unique FU Ori type object in the Cygnus OB7 complex

abstract:
  A photometric and spectral study of the variable star V2494 Cyg in the L 1003
dark cloud is presented. The brightness of the star, formerly known as HH 381
IRS, increased by 2.5 mag in R (probably in the 1980s) and since then has
remained nearly constant. Since the brightness increase, V2494 Cyg has
illuminated a bipolar cometary nebula. The stellar spectrum has several
features typical of the FU Ori type, plus it exhibits very strong Halpha and
forbidden emission lines with high-velocity components. These emission lines
originate in the HH jet near the star. The kinematic age of the jet is
consistent with it forming at the time of the outburst leading to the
luminosity increase. V2494 Cyg also produces a rather extended outflow; it is
the first known FUor with both an observed outburst and a parsec-sized HH flow.
The nebula, illuminated by V2494 Cyg, possesses similar morphological and
spectral characteristics to Hubble's Variable Nebula (R Monocerotis/NGC 2261).


title:
Quality of Real-Time Streaming in Wireless Cellular Networks -
  Stochastic Modeling and Analysis

abstract:
  We present a new stochastic service model with capacity sharing and
interruptions, appropriate for the evaluation of the quality of real-time
streaming (RTS), like e.g. mobile TV, in wireless cellular networks. The
general model takes into account multi-class Markovian process of call
arrivals, (to capture different radio channel conditions, requested streaming
bit-rates and durations) and allows for a general resource allocation policy
saying which users are temporarily denied the requested fixed streaming
bit-rates (put in outage) due to resource constraints. We give expressions for
several important performance characteristics of the model, including mean time
spent in outage and mean number of outage incidents for a typical user of a
given class. These expressions involve only stationary probabilities of the
(free) traffic demand process, which is a vector of independent Poisson random
variables describing the number of users of different classes. In order to
analyze RTS in 3GPP Long Term Evolution (LTE) cellular networks, we specify our
general model assuming orthogonal user channels with the peak bit-rates close
to the theoretical Shannon's bound in the additive white Gaussian noise (AWGN)
channel, which leads to the resource constraints in a multi-rate linear form.
In this setting we consider a natural class of least-effort-served-first
resource allocation policies, for which the characteristics of the model can be
further evaluated using Fourier analysis of Poisson variables. Within this
class we identify and evaluate an optimal and a fair policy, the latter being
suggested by LTE implementations. We also propose some intermediate policies,
which allow to solve the optimality/fairness tradeoff caused by unequal user
radio-channel conditions. Our results can be used for the evaluation of the
quality of RTS in LTE networks and dimensioning of these networks.


title: Quantum Hall effect in gapped graphene heterojunctions

abstract:
  We model the quantum Hall effect in heterostructures made of two gapped
graphene stripes with different gaps, $\Delta_1$ and $\Delta_2$. We consider
two main situations, $\Delta_1=0,\Delta_2\neq0$ and $\Delta_1=-\Delta_2$. They
are different in a fundamental aspect: only the latter feature kink states
that, when intervalley coupling is absent, are protected against
backscattering. We compute the two terminal conductance of heterostructures
with channel length up to 430 nm, in two transport configurations, parallel and
perpendicular to the interface. By studying the effect of disorder on the
transport along the boundary, we quantify the robustness of kink states with
respect to backscattering. Transport perpendicular to the boundary shows how
interface states open a backscattering channel for the conducting edge states,
spoiling the perfect conductance quantization featured by the homogeneously
gapped graphene Hall bars. Our results can be relevant for the study of
graphene deposited on hexagonal Boron-Nitride as well as to model graphene with
an interaction-driven gapped phase with two equivalent phases separated by a
domain wall.


title:
Connection between dense gas mass fraction, turbulence driving, and star
  formation efficiency of molecular clouds

abstract:
  We examine the physical parameters that affect the accumulation of gas in
molecular clouds to high column densities where the formation of stars takes
place. In particular, we analyze the dense gas mass fraction (DGMF) in a set of
self-gravitating, isothermal, magnetohydrodynamic turbulence simulations
including sink particles to model star formation. We find that the simulations
predict close to exponential DGMFs over the column density range N(H2) = 3-25 x
10^{21} cm^{-2} that can be easily probed via, e.g., dust extinction
measurements. The exponential slopes correlate with the type of turbulence
driving and also with the star formation efficiency. They are almost
uncorrelated with the sonic Mach number and magnetic-field strength. The slopes
at early stages of cloud evolution are steeper than at the later stages. A
comparison of these predictions with observations shows that only simulations
with relatively non-compressive driving (b ~< 0.4) agree with the DGMFs of
nearby molecular clouds. Massive infrared dark clouds can show DGMFs that are
in agreement with more compressive driving. The DGMFs of molecular clouds can
be significantly affected by how compressive the turbulence is on average.
Variations in the level of compression can cause scatter to the DGMF slopes,
and some variation is indeed necessary to explain the spread of the observed
DGMF slopes. The observed DGMF slopes can also be affected by the clouds' star
formation activities and statistical cloud-to-cloud variations.


title: Energy Evolution for the Sivers Asymmetries in Hard Processes

abstract:
  We investigate the energy evolution of the azimuthal spin asymmetries in
semi-inclusive hadron production in deep inelastic scattering (SIDIS) and
Drell-Yan lepton pair production in pp collisions. The scale dependence is
evaluated by applying an approximate solution to the Collins-Soper-Sterman
(CSS) evolution equation at one-loop order which is adequate for moderate Q^2
variations. This describes well the unpolarized cross sections for SIDIS and
Drell-Yan process in the $Q^2$ range of 2.4-100GeV^2. A combined analysis of
the Sivers asymmetries in SIDIS from HERMES and COMPASS experiments, and the
predictions for the Drell-Yan process at RHIC at \sqrt{S}=200GeV are presented.
We further extend to the Collins asymmetries and find, for the first time, a
consistent description for HERMES/COMPASS and BELLE experiments with the
evolution effects. We emphasize an important test of the evolution effects by
studying di-hadron azimuthal asymmetry in e^+e^- annihilation at moderate
energy range, such as at BEPC at \sqrt{S}=4.6GeV.


title:
One condition for solution uniqueness and robustness of both
  l1-synthesis and l1-analysis minimizations

abstract:
  The $\ell_1$-synthesis model and the $\ell_1$-analysis model recover
structured signals from their undersampled measurements. The solution of former
is a sparse sum of dictionary atoms, and that of the latter makes sparse
correlations with dictionary atoms. This paper addresses the question: when can
we trust these models to recover specific signals? We answer the question with
a condition that is both necessary and sufficient to guarantee the recovery to
be unique and exact and, in presence of measurement noise, to be robust. The
condition is one--for--all in the sense that it applies to both of the
$\ell_1$-synthesis and $\ell_1$-analysis models, to both of their constrained
and unconstrained formulations, and to both the exact recovery and robust
recovery cases. Furthermore, a convex infinity--norm program is introduced for
numerically verifying the condition. A comprehensive comparison with related
existing conditions are included.


title: Discrete Painleve equations and discrete KdV equation over finite fields

abstract:
  We investigate some of the discrete Painleve equations (dPII, qPI and qPII)
and the discrete KdV equation over finite fields. The first part concerns the
discrete Painleve equations. We review some of the ideas introduced in our
previous papers and give some detailed discussions. We first show that they are
well defined by extending the domain according to the theory of the space of
initial conditions. We then extend them to the field of p-adic numbers and
observe that they have a property that is called an `almost good reduction' of
dynamical systems over finite fields. We can use this property, which can be
interpreted as an arithmetic analogue of singularity confinement, to avoid the
indeterminacy of the equations over finite fields and to obtain special
solutions from those defined originally over fields of characteristic zero. In
the second part we study the discrete KdV equation. We review the previous
discussions and present a way to resolve the indeterminacy of the equation by
treating it over a field of rational functions instead of the finite field
itself. Explicit forms of soliton solutions and their periods over finite
fields are obtained.
  Note: This is a review article on the recent developments in the theory of
discrete integrable equations over finite fields based on arXiv:1201.5429,
arXiv:1206.4456, arXiv:1209.0223. This article is published as the proceedings
of the domestic conference "The breadth and depth of nonlinear discrete
integrable systems" in RIMS, Kyoto University, Japan, on August 2012.


title: Dynamic robust duality in utility maximization

abstract:
  A celebrated financial application of convex duality theory gives an explicit
relation between the following two quantities:
  (i) The optimal terminal wealth $X^*(T) : = X_{\varphi^*}(T)$ of the problem
to maximize the expected $U$-utility of the terminal wealth $X_{\varphi}(T)$
generated by admissible portfolios $\varphi(t), 0 \leq t \leq T$ in a market
with the risky asset price process modeled as a semimartingale;
  (ii) The optimal scenario $\frac{dQ^*}{dP}$ of the dual problem to minimize
the expected $V$-value of $\frac{dQ}{dP}$ over a family of equivalent local
martingale measures $Q$, where $V$ is the convex conjugate function of the
concave function $U$.
  In this paper we consider markets modeled by It\^o-L\'evy processes. In the
first part we use the maximum principle in stochastic control theory to extend
the above relation to a \emph{dynamic} relation, valid for all $t \in [0,T]$.
We prove in particular that the optimal adjoint process for the primal problem
coincides with the optimal density process, and that the optimal adjoint
process for the dual problem coincides with the optimal wealth process, $0 \leq
t \leq T$. In the terminal time case $t=T$ we recover the classical duality
connection above. We get moreover an explicit relation between the optimal
portfolio $\varphi^*$ and the optimal measure $Q^*$. We also obtain that the
existence of an optimal scenario is equivalent to the replicability of a
related $T$-claim.
  In the second part we present robust (model uncertainty) versions of the
optimization problems in (i) and (ii), and we prove a similar dynamic relation
between them. In particular, we show how to get from the solution of one of the
problems to the other. We illustrate the results with explicit examples.


title: Quantum holonomy in Lieb-Liniger model

abstract:
  We examine a parametric cycle in the N-body Lieb-Liniger model that starts
from the free system and goes through Tonks-Girardeau and super-Tonks-Girardeau
regimes and comes back to the free system. We show the existence of exotic
quantum holonomy, whose detailed workings are analysed with the specific sample
of two- and three body systems. The classification of eigenstates based on
clustering structure naturally emerges from the analysis.

categories: cond-mat.quant-gas math-ph math.MP quant-ph


title: Resource-efficient linear-optical quantum router

abstract:
  All-linear-optical scheme for fully featured quantum router is presented.
This device directs the signal photonic qubit according to the state of one
control photonic qubit. In the introduction we formulate the list of
requirements imposed on a fully quantum router. Then we describe our proposal
showing the exact principle of operation on a linear-optical scheme.
Subsequently we provide generalization of the scheme in order to optimize the
success probability by means of a tunable controlled-phase gate. At the end, we
show how one can modify the device to route multiple signal qubits using the
same control qubit.


title:
Material Optimization for Fermi Surface Shape Control of Tl-based
  Cuprate Superconductors

abstract:
  To show an optimization method of element substitution for cuprate
superconductors, we investigate Fermi surface shape of TlR2A2Cu3O9 with R=La,
Y, and A=Li, Na, K, Rb, Cs. We adopt the generalized gradient approximation in
the density-functional theory (DFT-GGA) for the study of over-doped phases of
these unknown cuprates. The electronic structures of crystals optimized by
DFT-GGA show systematic element dependence in a Fermi surface shape controlling
parameter, r, of Cu dx2-y2 bands, where nearly absent dz2 component at the
Fermi level and smaller r keeping t1 suggest enhancement of the superconducting
transition temperature within the spin-fluctuation mechanism. For TlYRb2Cu3O9,
smaller r by a reduction factor larger than 10% compared to a reference system
of TlBa2Ca2Cu3O9 (TBCCO) appears in the outer CuO2 plane, but with 12 %
reduction in t1. For TlR2Li2Cu3O9, (R=Y, La), smaller r by a factor larger than
1% appears keeping t1 as large as TBCCO in the inner plane. Our method may be
used to predict an optimized material structure referencing known cuprate
superconductors.


title: Unimodality via Kronecker products

abstract:
  We present new proofs and generalizations of unimodality of the q-binomial
coefficients \binom{n}{k}_q as polynomials in q. We use an algebraic approach
by interpreting the differences between numbers of certain partitions as
Kronecker coefficients of representations of S_n. Other applications of this
approach include strict unimodality of the diagonal q-binomial coefficients and
unimodality of certain partition statistics.


title: Towards an Infrastructure-less SOA for Mobile Web Service Composition

abstract:
  Service composition enables customizable services to be provided to the
service consumers. Since the capabilities and the performances of mobile
devices (e.g., smart phone, PDA, handheld media player) have improved, a mobile
device can be utilized to interact with external mobile service providers
towards providing composite Web service to remote clients. Existing approaches
on mobile-hosted service composition are usually platform dependent, and rely
on centralized infrastructure. Such approaches are not feasible in an open,
mobile infrastructure-less environment, in which networked services are
implemented using different technologies, devices are capable of dynamically
joining or leaving the network, and a centralized management entity is
nonexistent. This paper proposes a solution to enable mobile Web service
composition in an open, infrastructure-less environment based on loosely
coupled SOA techniques.


title: Stability of Underwater Periodic Locomotion

abstract:
  Most aquatic vertebrates swim by lateral flapping of their bodies and caudal
fins. While much effort has been devoted to understanding the flapping
kinematics and its influence on the swimming efficiency, little is known about
the stability (or lack of) of periodic swimming. It is believed that stability
limits maneuverability and body designs/flapping motions that are adapted for
stable swimming are not suitable for high maneuverability and vice versa. In
this paper, we consider a simplified model of a planar elliptic body undergoing
prescribed periodic heaving and pitching in potential flow. We show that
periodic locomotion can be achieved due to the resulting hydrodynamic forces,
and its value depends on several parameters including the aspect ratio of the
body, the amplitudes and phases of the prescribed flapping. We obtain
closed-form solutions for the locomotion and efficiency for small flapping
amplitudes, and numerical results for finite flapping amplitudes. We then study
the stability of the (finite amplitude flapping) periodic locomotion using
Floquet theory. We find that stability depends nonlinearly on all parameters.
Interesting trends of switching between stable and unstable motions emerge and
evolve as we continuously vary the parameter values. This suggests that, for
live organisms that control their flapping motion, maneuverability and
stability need not be thought of as disjoint properties, rather the organism
may manipulate its motion in favor of one or the other depending on the task at
hand.


title: Neutrino Mixing: Theoretical Overview

abstract:
  We present a concise review of the recent important experimental developments
on neutrino mixing (hints for sterile neutrinos, large $\theta_{13}$, possible
non maximal $\theta_{23}$, approaching sensitivity on $\delta_{CP}$) and their
implications on models of neutrino mixing. The new data disfavour many models
but the surviving ones still span a wide range going from Anarchy (no
structure, no symmetry in the lepton sector) to a maximum of symmetry, as for
the models based on discrete non-abelian flavour groups that can be improved
following the indications from the data.


title:
Some weighted estimates for the dbar- equation and a finite rank theorem
  for Toeplitz operators in the Fock space

abstract:
  We consider the $\dbar-$ equation in $\C^1$ in classes of functions with
Gaussian decay at infinity. We prove that if the right-hand side of the
equation is majorated by $\exp(-q|z|^2)$, with some positive $q$, together with
derivatives up to some order, and is orthogonal, as a distribution, to all
analytical polynomials, then there exists a solution with decays, together with
derivatives, as $\exp(-q'|z|^2)$, for any $q'<q/e$. This result carries over to
the $\dbar$-equation in classes of distributions, again, with Gaussian decay at
infinity, in some precisely defined sense. The properties of the solution are
used further on to prove the finite rank theorem for Toeplitz operators with
distributional symbols in the Fock space: the symbol of such operator must be a
combination of finitely many $\delta$-distributions and their derivatives. The
latter result generalizes the recent theorem on finite rank Toeplitz operators
with symbols-functions.


title: Maximum degree in minor-closed classes of graphs

abstract:
  Given a class of graphs G closed under taking minors, we study the maximum
degree \Delta_n of random graphs from G with n vertices. We prove several lower
and upper bounds that hold with high probability. Among other results, we find
classes of graphs providing orders of magnitude for \Delta_n not observed
before, such us \log n/ \log \log \log n and \log n/ \log \log \log \log n.


title: Jacobi - type identities in algebras and superalgebras

abstract:
  We introduce two remarkable identities written in terms of single commutators
and anticommutators for any three elements of arbitrary associative algebra.
One is a consequence of other (fundamental identity). From the fundamental
identity, we derive a set of four identities (one of which is the Jacobi
identity) represented in terms of double commutators and anticommutators. We
establish that two of the four identities are independent and show that if the
fundamental identity holds for an algebra, then the multiplication operation in
that algebra is associative. We find a generalization of the obtained results
to the super case and give a generalization of the fundamental identity in the
case of arbitrary elements. For nondegenerate even symplectic (super)manifolds,
we discuss analogues of the fundamental identity.


title: Constraint Satisfaction over Generalized Staircase Constraints

abstract:
  One of the key research interests in the area of Constraint Satisfaction
Problem (CSP) is to identify tractable classes of constraints and develop
efficient solutions for them. In this paper, we introduce generalized staircase
(GS) constraints which is an important generalization of one such tractable
class found in the literature, namely, staircase constraints. GS constraints
are of two kinds, down staircase (DS) and up staircase (US). We first examine
several properties of GS constraints, and then show that arc consistency is
sufficient to determine a solution to a CSP over DS constraints. Further, we
propose an optimal O(cd) time and space algorithm to compute arc consistency
for GS constraints where c is the number of constraints and d is the size of
the largest domain. Next, observing that arc consistency is not necessary for
solving a DSCSP, we propose a more efficient algorithm for solving it. With
regard to US constraints, arc consistency is not known to be sufficient to
determine a solution, and therefore, methods such as path consistency or
variable elimination are required. Since arc consistency acts as a subroutine
for these existing methods, replacing it by our optimal O(cd) arc consistency
algorithm produces a more efficient method for solving a USCSP.


title:
Word equations in simple groups and polynomial equations in simple
  algebras

abstract:
  We give a brief survey of recent results on word maps on simple groups and
polynomial maps on simple associative and Lie algebras. Our focus is on
parallelism between these theories, allowing one to state many new open
problems and giving new ways for solving older ones.


title:
Local-global invariants of finite and infinite groups: around Burnside
  from another side

abstract:
  This expository essay is focused on the Shafarevich-Tate set of a group $G$.
Since its introduction for a finite group by Burnside, it has been rediscovered
and redefined more than once. We discuss its various incarnations and
properties as well as relationships (some of them conjectural) with other
local-global invariants of groups.


title: Aggregated motion estimation for real-time MRI reconstruction

abstract:
  Real-time magnetic resonance imaging (MRI) methods generally shorten the
measuring time by acquiring less data than needed according to the sampling
theorem. In order to obtain a proper image from such undersampled data, the
reconstruction is commonly defined as the solution of an inverse problem, which
is regularized by a priori assumptions about the object. While practical
realizations have hitherto been surprisingly successful, strong assumptions
about the continuity of image features may affect the temporal fidelity of the
estimated images. Here we propose a novel approach for the reconstruction of
serial real-time MRI data which integrates the deformations between nearby
frames into the data consistency term. The method is not required to be affine
or rigid and does not need additional measurements. Moreover, it handles
multi-channel MRI data by simultaneously determining the image and its coil
sensitivity profiles in a nonlinear formulation which also adapts to
non-Cartesian (e.g., radial) sampling schemes. Experimental results of a motion
phantom with controlled speed and in vivo measurements of rapid tongue
movements demonstrate image improvements in preserving temporal fidelity and
removing residual artifacts.


title:
Online charge calibration of LHAASO-WCDA---a study with the engineering
  array

abstract:
  LHAASO-WCDA is a large ground-based water Cherenkov detector array planned to
be built at Shangri-La, Yunnan Province, China. As a major component of LHAASO
project, the main purpose of LHAASO-WCDA is to survey the northern sky for
very-high-energy (above 100 GeV) gamma ray sources. To gain full knowledge of
water Cherenkov technique and to well investigate engineering issues, a 9-cell
detector array has been built at Yang-Ba-Jing site, neighboring to the ARGO-YBJ
experiment. With the array, charge calibration methods for low and high ranges
of the PMT readout are studied, whose result shows that a very high precision
at several percentages can be reached. These calibration methods are proposed
to be applied in the future LHAASO-WCDA project.


title:
Invariant measures and long time behaviour for the Benjamin-Ono equation
  II

abstract:
  As a continuation of our previous work on the subject, we prove new measure
invariance results for the Benjamin-Ono equation. The measures are associated
with conservation laws whose leading term is a fractional Sobolev norm of order
larger or equal than 5/2. The new ingredient, compared with the case of
conservation laws whose leading term is an integer Sobolev norm of order larger
or equal than 3 (that has been studied in our previous work), is the use of
suitable orthogonality relations satisfied by multilinear products of centered
complex independent gaussian variables. We also give some partial results for
the measures associated with the two remaining conservation laws at lower
regularity. We plan to complete the proof of their invariance in a separated
article which will be the final in the series. Finally in an appendix, we give
a brief comparing of the recurrence properties of the flows of Benjamin-Ono and
KdV equations.


title:
Depletion layer-induced size effects in ferroelectric thin films: A
  Ginzburg-Landau model study

abstract:
  A Ginzburg-Landau model is used to demonstrate how depletion layers give rise
to thickness-dependent ferroelectric properties in thin films. It is shown that
free charge layers at the film-electrode interface can result in an internal
electric field in the bulk of the film even when no external voltage is
applied. At high values of the donor dopant density and small thicknesses, this
internal electric field can be strong enough to lead to the formation of a
domain pattern. This causes a drop in the remnant polarization; a direct
demonstration of the important role free charge plays in thin ferroelectric
films.


title:
Water Planets in the Habitable Zone: Atmospheric Chemistry, Observable
  Features, and the case of Kepler-62e and -62f

abstract:
  Planets composed of large quantities of water that reside in the habitable
zone are expected to have distinct geophysics and geochemistry of their
surfaces and atmospheres. We explore these properties motivated by two key
questions: whether such planets could provide habitable conditions and whether
they exhibit discernable spectral features that distinguish a water-planet from
a rocky Earth-like planet. We show that the recently discovered planets
Kepler-62e and -62f are the first viable candidates for habitable zone
water-planet. We use these planets as test cases for discussing those
differences in detail. We generate atmospheric spectral models and find that
potentially habitable water-planets show a distinctive spectral fingerprint in
transit depending on their position in the habitable zone.


title: Same-sign tetra-leptons in type II seesaw at the LHC

abstract:
  In type II seesaw model of neutrino mass generation, we study a remarkable
signal of same-sign tetra-lepton (SS4L) signal at the Large hadron collider.
When doubly charged Higgs is lightest, the heavier singly charged or neutral
Higgs boson produces a doubly charged Higgs boson through its fast gauge decay.
This leads to a novel signature of same-sign tetra-leptons resulting from a
pair production of same-sign doubly charged Higgs bosons. We study production
cross section for the SS4L signal in parameter space of the mass splitting
among triplet components and the triplet vacuum expectation value at the LHC.


title: Out-of-equilibrium one-dimensional disordered dipole chain

abstract:
  We consider a chain of one-dimensional dipole moments connected to two
thermal baths with different temperatures. The system is in nonequilibrium
steady state and heat flows through it. Assuming that fluctuation of the dipole
moment is a small parameter, we develop an analytically solvable model for the
problem. The effect of disorder is introduced by randomizing the positions of
the dipole moments. We show that the disorder leads to Anderson-like transition
from conducting to a thermal insulating state of the chain. It is shown that
considered chain supports both ballistic and diffusive heat transports
depending on the strength of the disorder. We demonstrate that nonequilibrium
leads to the emergence of the long-range order between dipoles along the chain
and make the conjecture that the interplay between nonequilibrium and
next-to-nearest-neighbor interactions results in the emergence of long-range
correlations in low-dimensional classical systems.


title: Residual Deficiency

abstract:
  We introduce a new real valued invariant for finitely presented groups called
residual deficiency. Its main property is the following. Let G be a finitely
presented group. If the residual deficiency of G is greater than one, then G
has a finite index subgroup with deficiency greater than one. The latter
property is strong. For instance, such a group is large, has positive rank
gradient and positive first L^2-Betti number, among other properties. We also
compute the residual deficiency of some well known families of presentations,
prove that residual deficiency minus one is supermultiplicative with respect to
finite index normal subgroups and find lower bounds for the residual deficiency
of quotients.


title:
Exact general relativistic lensing versus thin lens approximation: the
  crucial role of the void

abstract:
  We have used an exact general relativistic model structure within a FRW
cosmological background based on a LTB metric to study the gravitational
lensing of a cosmological structure. The integration of the geodesic equations
turned out to be a delicate task. We realized that the use of the rank 8(7) and
10(11) Runge-Kutta numerical method leads to a numerical effect and is
therefore unreliable. The so-called semi-implicit Rosenbrock method, however,
turned out to be a viable integration method for our problem. The deviation
angle calculated by the integration of the geodesic equations for different
density profiles of the model structure was then compared to those of the
corresponding thin lens approximation. Using the familiar NFW density profile,
it is shown that independent of the truncation details the thin lens
approximation differ substantially from the exact relativistic calculation. The
difference in the deflection angle for different impact parameters may be up to
about 30 percent. However, using the modified NFW density profile with a void
before going over to the FRW background, as required by an exact general
relativistic model, the thin lens approximation coincides almost exactly with
the general relativistic calculation.


title:
Combinaison d'information visuelle, conceptuelle, et contextuelle pour
  la construction automatique de hierarchies semantiques adaptees a
  l'annotation d'images

abstract:
  This paper proposes a new methodology to automatically build semantic
hierarchies suitable for image annotation and classification. The building of
the hierarchy is based on a new measure of semantic similarity. The proposed
measure incorporates several sources of information: visual, conceptual and
contextual as we defined in this paper. The aim is to provide a measure that
best represents image semantics. We then propose rules based on this measure,
for the building of the final hierarchy, and which explicitly encode
hierarchical relationships between different concepts. Therefore, the built
hierarchy is used in a semantic hierarchical classification framework for image
annotation. Our experiments and results show that the hierarchy built improves
classification results.
  Ce papier propose une nouvelle methode pour la construction automatique de
hierarchies semantiques adaptees a la classification et a l'annotation
d'images. La construction de la hierarchie est basee sur une nouvelle mesure de
similarite semantique qui integre plusieurs sources d'informations: visuelle,
conceptuelle et contextuelle que nous definissons dans ce papier. L'objectif
est de fournir une mesure qui est plus proche de la semantique des images. Nous
proposons ensuite des regles, basees sur cette mesure, pour la construction de
la hierarchie finale qui encode explicitement les relations hierarchiques entre
les differents concepts. La hierarchie construite est ensuite utilisee dans un
cadre de classification semantique hierarchique d'images en concepts visuels.
Nos experiences et resultats montrent que la hierarchie construite permet
d'ameliorer les resultats de la classification.


title: Trees of metric compacta and trees of manifolds

abstract:
  We present a construction, called the limit of a tree system of spaces (or,
less formally, a tree of spaces). The construction is designed to produce
compact metric spaces that resemble fractals, out of more regular spaces, such
as closed manifolds, compact polyhedra, compact Menger manifolds, etc. Such
spaces are potential candidates to be homeomorphic to ideal boundaries of
infinite groups. A very special case of this construction, trees of manifolds
(known also as Jakobsche spaces), has been studied in the literature. We
present here a different approach, much more general, and, as we believe, much
more convenient for establishing various basic properties of the resulting
spaces, in a more general setting. Already in the case of trees of manifolds,
using this approach we clarify, correct and extend so far known results and
properties.


title: Central Clearing of OTC Derivatives: bilateral vs multilateral netting

abstract:
  We study the impact of central clearing of over-the-counter (OTC)
transactions on counterparty exposures in a market with OTC transactions across
several asset classes with heterogeneous characteristics. The impact of
introducing a central counterparty (CCP) on expected interdealer exposure is
determined by the tradeoff between multilateral netting across dealers on one
hand and bilateral netting across asset classes on the other hand. We find this
tradeoff to be sensitive to assumptions on heterogeneity of asset classes in
terms of `riskyness' of the asset class as well as correlation of exposures
across asset classes. In particular, while an analysis assuming independent,
homogeneous exposures suggests that central clearing is efficient only if one
has an unrealistically high number of participants, the opposite conclusion is
reached if differences in riskyness and correlation across asset classes are
realistically taken into account. We argue that empirically plausible
specifications of model parameters lead to the conclusion that central clearing
does reduce interdealer exposures: the gain from multilateral netting in a CCP
overweighs the loss of netting across asset classes in bilateral netting
agreements. When a CCP exists for interest rate derivatives, adding a CCP for
credit derivatives is shown to decrease overall exposures. These findings are
shown to be robust to the statistical assumptions of the model as well as the
choice of risk measure used to quantify exposures.


title: Pulsational instability in B-type supergiant stars

abstract:
  We present results of the instability analysis of the post-main sequence
massive star models against radial and nonradial pulsations. We confirm that
both p- and g-modes can be excited by the $\kappa$-mechanism acting in the
metal opacity bump. However, as opposed to the previous claims, we find that an
intermediate convective zone (ICZ) related to the hydrogen burning shell is not
necessary for excitation of g-modes. These modes can be reflected at a minimum
of the Brunt-V\"ais\"al\"a frequency, located at the top of the chemical
composition gradient region surrounding the radiative helium core. This minimum
is associated with the change of actual temperature gradient from the adiabatic
value in the semiconvective zone to the radiative value above it. Thus, the
existence of pulsations at this evolutionary stage does not prove the existence
of the convective zone but only some reflective layer. Finally, we show that no
regular patterns can be expected in oscillation spectra of blue supergiant
pulsators but there is a prospect for identification of the mode degree,
$\ell$, from multicolour photometry.


title: Trees of manifolds as boundaries of spaces and groups

abstract:
  We show that trees of manifolds, the topological spaces introduced by
Jakobsche, appear as boundaries at infinity of various spaces and groups. In
particular, they appear as Gromov boundaries of some hyperbolic groups, of
arbitrary dimension, obtained by the procedure of strict hyperbolization. We
also recognize these spaces as boundaries of arbitrary Coxeter groups with
manifold nerves, and as Gromov boundaries of the fundamental groups of singular
spaces obtained from some finite volume hyperbolic manifolds by cutting off
their cusps and collapsing the resulting boundary tori to points.


title:
Joint On-the-Fly Network Coding/Video Quality Adaptation for Real-Time
  Delivery

abstract:
  This paper introduces a redundancy adaptation algorithm for an on-the-fly
erasure network coding scheme called Tetrys in the context of real-time video
transmission. The algorithm exploits the relationship between the redundancy
ratio used by Tetrys and the gain or loss in encoding bit rate from changing a
video quality parameter called the Quantization Parameter (QP). Our evaluations
show that with equal or less bandwidth occupation, the video protected by
Tetrys with redundancy adaptation algorithm obtains a PSNR gain up to or more 4
dB compared to the video without Tetrys protection. We demonstrate that the
Tetrys redundancy adaptation algorithm performs well with the variations of
both loss pattern and delay induced by the networks. We also show that Tetrys
with the redundancy adaptation algorithm outperforms FEC with and without
redundancy adaptation.


title: The Tap code - a code similar to Morse code for communication by tapping

abstract:
  A code is presented for fast, easy and efficient communication over channels
that allow only two signal types: a single sound (e.g. a knock), or no sound
(i.e. silence). This is a true binary code while Morse code is a ternary code
and does not work in such situations. Thus the presented code is more universal
than Morse and can be used in much more situations. Additionally it is very
tolerant to variations in signal strength or duration. The paper contains
various ways in which the code can be derived, that all lead to the same code.
It also contains a comparison to other, similar codes, including the Morse
code, in regards to efficiency and other attributes. The replacement of Morse
code with Tap code is not proposed.


title: Compact 3-manifolds via 4-colored graphs

abstract:
  We introduce a representation of compact 3-manifolds without spherical
boundary components via (regular) 4-colored graphs, which turns out to be very
convenient for computer aided study and tabulation. Our construction is a
direct generalization of the one given in the eighties by S. Lins for closed
3-manifolds, which is in turn dual to the earlier construction introduced by
Pezzana's school in Modena. In this context we establish some results
concerning fundamental groups, connected sums, moves between graphs
representing the same manifold, Heegaard genus and complexity, as well as an
enumeration and classification of compact 3-manifolds representable by graphs
with few vertices ($\le 6$ in the non-orientable case and $\le 8$ in the
orientable one).


title:
Off-equilibrium Langevin dynamics of the discrete nonlinear Schroedinger
  chain

abstract:
  Suitable Langevin thermostats are introduced which are able to control both
the temperature and the chemical potential of a one-dimensional lattice of
nonlinear Schr\"odinger oscillators. The resulting non-equilibrium stationary
states are then investigated in two limit cases (low temperatures and large
particle densities), where the dynamics can be mapped onto that of a
coupled-rotor chain with an external torque. As a result, an effective kinetic
definition of temperature can be introduced and compared with the general
microcanonical (global) definition.


title:
Derivation, interpretation, and analog modelling of fractional variable
  order derivative definition

abstract:
  The paper presents derivation and interpretation of one type of variable
order derivative definitions. For mathematical modelling of considering
definition the switching and numerical scheme is given. The paper also
introduces a numerical scheme for a variable order derivatives based on matrix
approach. Using this approach, the identity of the switching scheme and
considered definition is derived. The switching scheme can be used as an
interpretation of this type of definition. Paper presents also numerical
examples for introduced methods. Finally, the idea and results of analog
(electrical) realization of the switching fractional order integrator (of
orders 0.5 and 1) are presented and compared with numerical approach.


title:
Blind Non-parametric Statistics for Multichannel Detection Based on
  Statistical Covariances

abstract:
  We consider the problem of detecting the presence of a spatially correlated
multichannel signal corrupted by additive Gaussian noise (i.i.d across
sensors). No prior knowledge is assumed about the system parameters such as the
noise variance, number of sources and correlation among signals. It is well
known that the GLRT statistics for this composite hypothesis testing problem
are asymptotically optimal and sensitive to variation in system model or its
parameter. To address these shortcomings we present a few non-parametric
statistics which are functions of the elements of Bartlett decomposed sample
covariance matrix. They are designed such that the detection performance is
immune to the uncertainty in the knowledge of noise variance. The analysis
presented verifies the invariability of threshold value and identifies a few
specific scenarios where the proposed statistics have better performance
compared to GLRT statistics. The sensitivity of the statistic to correlation
among streams, number of sources and sample size at low signal to noise ratio
are discussed.


title:
Role of weak measurements on states ordering and monogamy of quantum
  correlation

abstract:
  The information-theoretic definition of quantum correlation, e.g., quantum
discord, is measurement dependent. By considering the more general quantum
measurements, weak measurements, which include the projective measurement as a
limiting case, we show that while weak measurements can enable one to capture
more quantumness of correlation in a state, it can also induce other
counterintuitive quantum effects. Specifically, we show that the general
measurements with different strengths can impose different orderings for
quantum correlations of some states. It can also modify the monogamous
character for certain classes of states as well which may diminish the
usefulness of quantum correlation as a resource in some protocols. In this
sense, we say that the weak measurements play a dual role in defining quantum
correlation.


title: On the Rate of Information Loss in Memoryless Systems

abstract:
  In this work we present results about the rate of (relative) information loss
induced by passing a real-valued, stationary stochastic process through a
memoryless system. We show that for a special class of systems the information
loss rate is closely related to the difference of differential entropy rates of
the input and output processes. It is further shown that the rate of (relative)
information loss is bounded from above by the (relative) information loss the
system induces on a random variable distributed according to the process's
marginal distribution.
  As a side result, in this work we present sufficient conditions such that for
a continuous-valued Markovian input process also the output process possesses
the Markov property.


title: Optical-resolution photoacoustic microscopy by use of a multimode fiber

abstract:
  We demonstrate Optical-Resolution Photoacoustic Microscopy (OR-PAM), where
the optical field is focused and scanned using Digital Phase Conjugation (DPC)
through a multimode fiber. The focus is scanned across the field of view using
digital means, and the acoustic signal induced is collected by a transducer.
Optical-resolution photoacoustic images of a knot made by two absorptive wires
are obtained and we report on resolution smaller than 1.5{\mu}m across a
201{\mu}m by 201{\mu}m field of view. The use of a multimode optical fiber for
the optical excitation part can pave the way for miniature endoscopes that can
provide optical-resolution photoacoustic images at large optical depth.


title: Multiplicity of Positive Solutions for an Obstacle Problem in R

abstract:
  In this paper we establish the existence of two positive solutions for the
obstacle problem $$ \displaystyle \int_{\Re}\left[u'(v-u)'+(1+\lambda
V(x))u(v-u)\right] \geq \displaystyle \int_{\Re} f(u)(v-u), \forall v\in \Ka $$
where $f$ is a continuous function verifying some technical conditions and
$\Ka$ is the convex set given by $$ \Ka =\left\{v\in H^{1}(\Re); v \geq \varphi
\right\}, $$ with $\varphi \in H^{1}(\Re)$ having nontrivial positive part with
compact support in $\Re$.
  \vspace{0.2cm} \noindent \emph{2000 Mathematics Subject Classification} :
34B18, 35A15, 46E39.
  \noindent \emph{Key words}: Obstacle problem, Variational methods, Positive
solutions.


title:
Absence of superheating for ice Ih with a free surface : a new method of
  determining the melting point of different water models

abstract:
  Molecular dynamic simulations were performed for ice Ih with a free surface.
The simulations were carried out at several temperatures and each run lasted
more than 7ns. At high temperatures the ice melts. It is demonstrated that the
melting process starts at the surface and propagates to the bulk of the ice
block. Already at the temperatures below the melting point, we observe a thin
liquid layer at the ice surface, but the block of ice remains stable along the
run. As soon as the temperature reaches the melting point the entire ice block
melts. Our results demonstrate that, unlike in the case of conventional
simulations in the NpT ensemble, overheating of the ice Ih with a free surface
does not occur. That allows to estimate the melting point of ice at zero
pressure. We applied the method to the following models of water: SPC/E, TIP4P,
TIP4P/Ew, TIP4P/Ice and TIP4P/2005, and found good agreement between the
melting temperatures obtained by this procedure and the values obtained either
from free energy calculations or from direct simulations of the ice/water
interface.


title:
Superfluid clusters, percolation and phase transitions in the
  disordered, two dimensional Bose-Hubbard model

abstract:
  The Bose glass (BG) phase is the Griffiths region of the disordered Bose
Hubbard model (BHM), characterized by finite, quasi-superfluid clusters within
a Mott insulating background. We propose to utilize this characterization to
identify the complete zero-temperature phase diagram of the disordered BHM in
$d\ge2$ dimensions by analyzing the geometric properties of what we call
superfluid (SF) clusters, which are defined to be clusters of sites with
non-integer expectation values for the local boson occupation number. The Mott
insulator (MI) phase then is the region in the phase diagram where no SF
clusters exist, and the SF phase the region, where SF clusters percolate - the
BG phase is in between: SF clusters exist, but do not percolate. This
definition is particularly useful in the context of local mean field (LMF, or
Gutzwiller-Ansatz) calculations, where we show that an identification of the
phases on the basis of global quantities like the averaged SF order parameter
and the compressibility are misleading. We apply the SF cluster analysis to the
LMF ground states of the two dimensional disordered BHM to produce its phase
diagram and find a) an excellent agreement with the phase diagram predicted on
the basis of quantum Monte Carlo simulations for the commensurate density
$n=1$, and b) large differences to stochastic mean field and other mean field
predictions for fixed disorder strength. The relation of the percolation
transition of the SF clusters with the onset of non-vanishing SF stiffness
indicating the BG to SF transition is discussed.


title: Scenarios with Composite Higgs Bosons

abstract:
  Typical models with composite Higgs bosons are briefly reviewed. We also
introduce the isospin symmetric Higgs model recently proposed in Ref. 1.


title: Open Tiled Manycore System-on-Chip

abstract:
  Manycore System-on-Chip include an increasing amount of processing elements
and have become an important research topic for improvements of both hardware
and software. While research can be conducted using system simulators,
prototyping requires a variety of components and is very time consuming. With
the Open Tiled Manycore System-on-Chip (OpTiMSoC) we aim at building such an
environment for use in our and other research projects as prototyping platform.
  This paper describes the project goals and aspects of OpTiMSoC and summarizes
the current status and ideas.


title: Easily Retrievable Objects among the NEO Population

abstract:
  Asteroids and comets are of strategic importance for science in an effort to
understand the formation, evolution and composition of the Solar System.
Near-Earth Objects (NEOs) are of particular interest because of their
accessibility from Earth, but also because of their speculated wealth of
material resources. The exploitation of these resources has long been discussed
as a means to lower the cost of future space endeavours. In this paper, we
consider the currently known NEO population and define a family of so-called
Easily Retrievable Objects (EROs), objects that can be transported from
accessible heliocentric orbits into the Earth's neighbourhood at affordable
costs. The asteroid retrieval transfers are sought from the continuum of low
energy transfers enabled by the dynamics of invariant manifolds; specifically,
the retrieval transfers target planar, vertical Lyapunov and halo orbit
families associated with the collinear equilibrium points of the Sun-Earth
Circular Restricted Three Body problem. The judicious use of these dynamical
features provides the best opportunity to find extremely low energy Earth
transfers for asteroid material. A catalogue of asteroid retrieval candidates
is then presented. Despite the highly incomplete census of very small
asteroids, the ERO catalogue can already be populated with 12 different objects
retrievable with less than 500 m/s of {\Delta}v. Moreover, the approach
proposed represents a robust search and ranking methodology for future
retrieval candidates that can be automatically applied to the growing survey of
NEOs.


title: How to construct generalized van der Corput sequences

abstract:
  The LS-sequences of points recently introduced by the author are a
generalization of van der Corput sequences. They were constructed by reordering
the points of the corresponding LS-sequences of partitions. Here we present
another algorithm which coincides with the classical one for van der Corput
sequences and is simpler to compute than the original construction. This
algorithm is based on the representation of natural numbers in base $L+S$ and
gives the van der Corput sequence in base $b$ if $L=b$ and S=0. In this
construction, as well as in the van der Corput one, it is essential the
inversion of digits of the representation in base $L+S$: in this paper we also
give a nice geometrical explanation of this "magical" operation.


title: Extended Object Tracking with Random Hypersurface Models

abstract:
  The Random Hypersurface Model (RHM) is introduced that allows for estimating
a shape approximation of an extended object in addition to its kinematic state.
An RHM represents the spatial extent by means of randomly scaled versions of
the shape boundary. In doing so, the shape parameters and the measurements are
related via a measurement equation that serves as the basis for a Gaussian
state estimator. Specific estimators are derived for elliptic and star-convex
shapes.


title: Probing LHC Higgs Signals from Extended Electroweak Gauge Group

abstract:
  We study the effects of the extended electroweak gauge sector on the signal
strengths of the Higgs boson at the LHC. Extension of the Higgs sector
associate with the extension of the electroweak gauge symmetry. In our setup,
there are two neutral Higgs states ($h$, $H$) and three new gauge bosons
($W'^{\pm}$, $Z'$). We assume the lightest scalar, $h$, is what LHC found and
its mass is 125 GeV. We find the enhancement of $\mu(gg \to h \to \gamma
\gamma)$. On the other hand, other decay processes are same as or smaller than
the SM expectation.


title:
On characters of Chevalley groups vanishing at the non-semisimple
  elements

abstract:
  Let G be a finite simple group of Lie type. In this paper we study characters
of G that vanish at the non-semisimple elements and whose degree is equal to
the order of a maximal unipotent subgroup of G. Such characters can be viewed
as a natural generalization of the Steinberg character. For groups G of small
rank we also determine the characters of this degree vanishing only at the
non-identity unipotent elements.


title: Symmetric quantum fully homomorphic encryption with perfect security

abstract:
  Suppose some data have been encrypted, can you compute with the data without
decrypting them? This problem has been studied as homomorphic encryption and
blind computing. We consider this problem in the context of quantum information
processing, and present the definitions of quantum homomorphic encryption (QHE)
and quantum fully homomorphic encryption (QFHE). Then, based on quantum
one-time pad (QOTP), we construct a symmetric QFHE scheme, where the evaluate
algorithm depends on the secret key. This scheme permits any unitary
transformation on any $n$-qubit state that has been encrypted. Compared with
classical homomorphic encryption, the QFHE scheme has perfect security.
Finally, we also construct a QOTP-based symmetric QHE scheme, where the
evaluate algorithm is independent of the secret key.


title: Planning of Cellular Networks Enhanced by Energy Harvesting

abstract:
  We pose a novel cellular network planning problem, considering the use of
renewable energy sources and a fundamentally new concept of energy balancing,
and propose a novel algorithm to solve it. In terms of the network capital and
operational expenditure, we conclude that savings can be made by enriching
cellular infrastructure with energy harvesting sources, in comparison to
traditional deployment methods.


title: Computing families of Cohen-Macaulay and Gorenstein rings

abstract:
  We characterize Cohen-Macaulay and Gorenstein rings obtained from certain
types of convex body semigroups. Algorithmic methods to check if a polygonal or
circle semigroup is Cohen-Macaulay/Gorenstein are given. We also provide some
families of Cohen-Macaulay and Gorenstein rings.


title: Formal Model of Living Organisms

abstract:
  A modeling formalism is proposed for the description and study of living and
life-like systems. It provides an abstract conceptual model framework for real
life and evolution of biological organisms. It is proposed, that this model
formalism provides a novel system view and immediately applicable conceptual
tools for understanding complex life and evolution. The modeling principle is
very generic suggesting that it can be directly applied also to the study of
engineered and artificial systems.


title: The merger history of massive spheroids since z~1 is size independent

abstract:
  Using a compilation of 379 massive (stellar mass M > 10^{11} M_Sun)
spheroid-like galaxies from the near-infrared Palomar/DEEP-2 survey, we have
probed, up to z~1, whether the presence of companions depends on the size of
the host galaxies. We have explored the presence of companions with mass ratios
down to 1:10 and 1:100, with respect to the central massive galaxy, and within
a projected distance of 30, 50 and 100 kpc of these objects. We find evidence
for these companions being equally distributed around both compact and extended
massive spheroids. This finding suggests that, at least since z~1, the merger
activity in these objects is rather homogeneous across the whole population and
its merger history is not affected for the size of the host galaxy. Our result
could indicate that both compact and extended massive spheroid-like galaxies
are growing in size at the same rate.


title:
Negative frequency tuning of a carbon nanotube nano-electromechanical
  resonator

abstract:
  A suspended, doubly clamped single wall carbon nanotube is characterized as
driven nano-electromechanical resonator at cryogenic temperatures.
Electronically, the carbon nanotube displays small bandgap behaviour with
Coulomb blockade oscillations in electron conduction and transparent contacts
in hole conduction. We observe the driven mechanical resonance in dc-transport,
including multiple higher harmonic responses. The data shows a distinct
negative frequency tuning at finite applied gate voltage, enabling us to
electrostatically decrease the resonance frequency to 75% of its maximum value.
This is consistently explained via electrostatic softening of the mechanical
mode.


title: The degree-2 Abel--Jacobi map for nodal curves - I

abstract:
  Let $f\col\C\ra B$ be a regular local smoothing of a nodal curve. In this
paper, we find a modular description of the Abel--N\'eron map having values in
Esteves's fine compactified Jacobian and extending the degree-2 Abel--Jacobi
map of the generic fiber of $f$


title:
Quantum to Classical Transition of Inflationary Perturbations -
  Continuous Spontaneous Localization as a Possible Mechanism -

abstract:
  The inflationary paradigm provides a mechanism to generate the primordial
perturbations needed to explain the observed large scale structures in the
universe. Inflation traces back all the inhomogeneities to quantum fluctuations
although the structures look classical today. Squeezing of primordial quantum
fluctuations along with the mechanism of decoherence accounts for many aspects
of this quantum to classical transition, although it remains a matter of debate
as to whether this is sufficient to explain the issue of realization of a
single outcome (i.e. the issue of macro-objectification) from a quantum
ensemble given that the universe is a closed system. A similar question of
emergence of classical behavior of macroscopic objects exists also for
laboratory systems and apart from decoherence there have been attempts to
resolve this issue through Continuous Spontaneous Localization (CSL), which is
a stochastic nonlinear modification of the non-relativistic Schr\"{o}dinger
equation. Recently, Martin {\it et al.} have investigated whether a CSL-like
mechanism with a constant strength parameter, when the Mukhanov-Sasaki variable
is taken as the "collapse-operator", can explain how the primordial quantum
perturbations generated during inflation become classical. Within the scope of
their assumptions they essentially come to a negative conclusion. In the
present work, we generalize their analysis by allowing the CSL strength
parameter to depend on physical scales so as to capture the CSL amplification
mechanism. We show that such a generalization provides a mechanism for
macro-objectification (i.e. classicalization) of the inflationary quantum
perturbations, while also preserving scale invariance of the power spectrum and
phase coherence of super-horizon perturbation modes in a particular class of
these models.


title:
Quasi-dilaton non-linear massive gravity: Investigations of background
  cosmological dynamics

abstract:
  We investigate cosmological behavior in the quasi-Dilaton non-linear massive
gravity. We perform a detailed dynamical analysis and examine the stable
late-time solutions relevant to late time cosmic acceleration. We demonstrate
that a dark-energy dominated, cosmological-constant-like solution is a late
attractor of the dynamics. We also analyze the evolution of the universe at
intermediate times, showing that the observed epoch sequence can be easily
obtained in the model under consideration. Furthermore, we study the
non-singular bounce and the cosmological turnaround which can be realized for a
region of the parameter space. Last but not least, we use observational data
from Type Ia Supernovae (SNIa), Baryon Acoustic Oscillations (BAO) and Cosmic
Microwave Background (CMB), in order to constrain the parameters of the theory.


title: Hyperfine interactions in two-dimensional HgTe topological insulators

abstract:
  We study the hyperfine interaction between the nuclear spins and the
electrons in a HgTe quantum well, which is the prime experimentally realized
example of a two-dimensional topological insulator. The hyperfine interaction
is a naturally present, internal source of broken time-reversal symmetry from
the point of view of the electrons. The HgTe quantum well is described by the
so-called Bernevig-Hughes-Zhang (BHZ) model. The basis states of the BHZ model
are combinations of both S- and P-like symmetry states, which means that three
kinds of hyperfine interactions play a role: (i) The Fermi contact interaction,
(ii) the dipole-dipole like coupling and (iii) the electron orbital to
nuclear-spin coupling. We provide benchmark results for the forms and
magnitudes of these hyperfine interactions within the BHZ model, which give a
good starting point for evaluating hyperfine interactions in any HgTe
nanostructure. We apply our results to the helical edge states of a HgTe
two-dimensional topological insulator and show how their total hyperfine
interaction becomes anisotropic and dependent on the orientation of the sample
edge within the plane. Moreover, for the helical edge states the hyperfine
interactions due to the P-like states can dominate over the S-like contribution
in certain circumstances.


title: Targeted Social Mobilisation in a Global Manhunt

abstract:
  Social mobilization, the ability to mobilize large numbers of people via
social networks to achieve highly distributed tasks, has received significant
attention in recent times. This growing capability, facilitated by modern
communication technology, is highly relevant to endeavors which require the
search for individuals that posses rare information or skill, such as finding
medical doctors during disasters, or searching for missing people. An open
question remains, as to whether in time-critical situations, people are able to
recruit in a targeted manner, or whether they resort to so-called blind search,
recruiting as many acquaintances as possible via broadcast communication. To
explore this question, we examine data from our recent success in the U.S.
State Department's Tag Challenge, which required locating and photographing 5
target persons in 5 different cities in the United States and Europe in less
than 12 hours, based only on a single mug-shot. We find that people are able to
consistently route information in a targeted fashion even under increasing time
pressure. We derive an analytical model for global mobilization and use it to
quantify the extent to which people were targeting others during recruitment.
Our model estimates that approximately 1 in 3 messages were of targeted fashion
during the most time-sensitive period of the challenge.This is a novel
observation at such short temporal scales, and calls for opportunities for
devising viral incentive schemes that provide distance- or time-sensitive
rewards to approach the target geography more rapidly, with applications in
multiple areas from emergency preparedness, to political mobilization.


title: Ultralight Solar Powered Hybrid Research Drone

abstract:
  A planetary research drone is proposed, which is capable for vertical takeoff
and landing. A hybrid flight concept utilizing static lift enables the
exploration over ground. The static lift is achieved with a lighter than CO2
gas like air, He or H2.


title: Expressando Atributos N\~ao-Funcionais em Workflows Cient\'ificos

abstract:
  In this paper we present OSC, a scientific workflow specification language
based on software architecture principles. In contrast with other approaches,
OSC employs connectors as first-class constructs. In this way, we leverage
reusability and compositionality in the workflow modeling process, specially in
the configuration of mechanisms that manage non-functional attributes.


title:
Improving Resource Location with Locally Precomputed Partial Random
  Walks

abstract:
  Random walks can be used to search complex networks for a desired resource.
To reduce search lengths, we propose a mechanism based on building random walks
connecting together partial walks (PW) previously computed at each network
node. Resources found in each PW are registered. Searches can then jump over
PWs where the resource is not located. However, we assume that perfect
recording of resources may be costly, and hence, probabilistic structures like
Bloom filters are used. Then, unnecessary hops may come from false positives at
the Bloom filters. Two variations of this mechanism have been considered,
depending on whether we first choose a PW in the current node and then check it
for the resource, or we first check all PWs and then choose one. In addition,
PWs can be either simple random walks or self-avoiding random walks. Analytical
models are provided to predict expected search lengths and other magnitudes of
the resulting four mechanisms. Simulation experiments validate these
predictions and allow us to compare these techniques with simple random walk
searches, finding very large reductions of expected search lengths.


title:
Impact maturity times and citation time windows: The 2-year maximum
  journal impact factor

abstract:
  Journal metrics are employed for the assessment of scientific scholar
journals from a general bibliometric perspective. In this context, the Thomson
Reuters journal impact factors (JIF) are the citation-based indicators most
used. The 2-year journal impact factor (2-JIF) counts citations to one and two
year old articles, while the 5-year journal impact factor (5-JIF) counts
citations from one to five year old articles. Nevertheless, these indicators
are not comparable among fields of science for two reasons: (i) each field has
a different impact maturity time, and (ii) because of systematic differences in
publication and citation behaviour across disciplines. In fact, the 5-JIF
firstly appeared in the Journal Citation Reports (JCR) in 2007 with the purpose
of making more comparable impacts in fields in which impact matures slowly.
However, there is not an optimal fixed impact maturity time valid for all the
fields. In some of them two years provides a good performance whereas in others
three or more years are necessary. Therefore, there is a problem when comparing
a journal from a field in which impact matures slowly with a journal from a
field in which impact matures rapidly. In this work, we propose the 2-year
maximum journal impact factor (2M-JIF), a new impact indicator that considers
the 2-year rolling citation time window of maximum impact instead of the
previous 2-year time window. Finally, an empirical application comparing 2-JIF,
5-JIF, and 2M-JIF shows that the maximum rolling target window reduces the
between-group variance with respect to the within-group variance in a random
sample of about six hundred journals from eight different fields.


title: Collective modes in free plasmas subjected to a radiation field

abstract:
  In this study we report the effects of an external electromagnetic field on
the collective properties of unmagnetized plasmas. The calculations are carried
out in the semi-classical approximation, i.e., the electromagnetic field is
treated classically and the electrons from a quantum mechanical viewpoint. The
results show that the collective modes are damped away more smoothly and in a
smaller frequency range than those reported by previous studies. An
exponential-like decay of the plasmon frequencies as a function of the external
field amplitude is readily observed. We successfully recreate the results of
previous studies. We also find that the single photon processes has a
pronounced effect on the decrease of the frequency range of modulation.


title:
Spontaneous ferromagnetism in the spinor Bose gas with Rashba spin-orbit
  coupling

abstract:
  We show that in the two-component Bose gas with Rashba spin-orbit coupling an
arbitrarily small attractive interaction between bosons with opposite spin
induces spontaneous ferromagnetism below a finite critical temperature $T_c$.
In the ferromagnetic phase the single-particle spectrum exhibits a unique
minimum in momentum space in the direction of the magnetization. For
sufficiently small temperatures below $T_c$ the bosons eventually condense into
the unique state at the bottom of the spectrum, forming a ferromagnetic
Bose-Einstein condensate.


title:
Thermal Phase Transition in the SO(5) x U(1) Gauge-Higgs Unification
  with 126GeV Higgs

abstract:
  We study the phase structure of the gauge theories in the space-time with one
compact dimension, where the gauge symmetry can be broken by the Hosotani
mechanism. As the extra dimension, we consider the SO(5) x U(1) gauge-Higgs
unification in the Randall-Sundrum space-time which reproduce the 126 GeV Higgs
mass. It is found that the thermal phase transition of the electroweak symmetry
is almost second order and the critical temperature is around 160 GeV for z_L <
10^7 and n_F=3.


title:
The existence and uniqueness result for Quasilinear Stochastic PDEs with
  Obstacle under weaker integrability conditions

abstract:
  We prove an existence and uniqueness result for quasilinear Stochastic PDEs
with Obstacle (in short OSPDE) under a weaker integrability condition on the
coefficient and the barrier.


title: Discovery of a superhard iron tetraboride superconductor

abstract:
  Single crystals of novel orthorhombic (space group Pnnm) iron tetraboride
FeB4 were synthesised at pressures above 8 GPa and high temperatures. Magnetic
susceptibility measurements demonstrated bulk superconductivity below 2.9 K.
The putative isotope effect on the superconducting critical temperature
indicates that FeB4 is likely a phonon-mediated superconductor, which is
unexpected in the light of previous knowledge on Fe-based superconductors. The
discovered iron tetraboride is highly incompressible and has the
nanoindentation hardness of 65(5) GPa, thus, it opens a new class of highly
desirable materials combining advanced mechanical properties and
superconductivity.


title:
Comparing journals from different fields of Science and Social Science
  through a JCR Subject Categories Normalized Impact Factor

abstract:
  The journal Impact Factor (IF) is not comparable among fields of Science and
Social Science because of systematic differences in publication and citation
behaviour across disciplines. In this work, a decomposing of the field
aggregate impact factor into five normally distributed variables is presented.
Considering these factors, a Principal Component Analysis is employed to find
the sources of the variance in the JCR subject categories of Science and Social
Science. Although publication and citation behaviour differs largely across
disciplines, principal components explain more than 78% of the total variance
and the average number of references per paper is not the primary factor
explaining the variance in impact factors across categories. The Categories
Normalized Impact Factor (CNIF) based on the JCR subject category list is
proposed and compared with the IF. This normalization is achieved by
considering all the indexing categories of each journal. An empirical
application, with one hundred journals in two or more subject categories of
economics and business, shows that the gap between rankings is reduced around
32% in the journals analyzed. This gap is obtained as the maximum distance
among the ranking percentiles from all categories where each journal is
included.


title:
Tilting bundles and the "missing part" on the weighted projective line
  of type $(2, 2, n)$

abstract:
  This paper classifies all the tilting bundles in the category of coherent
sheaves on the weighted projective line of weight type $(2, 2, n)$, and
investigates the abelianness of the "missing part" from the category of
coherent sheaves to the category of finitely generated right modules on the
associated tilted algebra for each tilting bundle.


title: Kadanoff Sand Pile Model. Avalanche Structure and Wave Shape

abstract:
  Sand pile models are dynamical systems describing the evolution from $N$
stacked grains to a stable configuration. It uses local rules to depict grain
moves and iterate it until reaching a fixed configuration from which no rule
can be applied. Physicists L. Kadanoff {\em et al} inspire KSPM, extending the
well known {\em Sand Pile Model} (SPM). In KSPM($D$), we start from a pile of
$N$ stacked grains and apply the rule: $D\!-\!1$ grains can fall from column
$i$ onto columns $i+1,i+2,\dots,i+D\!-\!1$ if the difference of height between
columns $i$ and $i\!+\!1$ is greater or equal to $D$. Toward the study of fixed
points (stable configurations on which no grain can move) obtained from $N$
stacked grains, we propose an iterative study of KSPM evolution consisting in
the repeated addition of one grain on a heap of sand, triggering an avalanche
at each iteration. We develop a formal background for the study of avalanches,
resumed in a finite state word transducer, and explain how this transducer may
be used to predict the form of fixed points. Further precise developments
provide a plain formula for fixed points of KSPM(3), showing the emergence of a
wavy shape.


title:
Central indexes to the citation distribution: A complement to the
  h-index

abstract:
  The citation distribution of a researcher shows the impact of their
production and determines the success of their scientific career. However, its
application in scientific evaluation is difficult due to the bi-dimensional
character of the distribution. Some bibliometric indexes that try to synthesize
in a numerical value the principal characteristics of this distribution have
been proposed recently. In contrast with other bibliometric measures, the
biases that the distribution tails provoke, are reduced by the h-index.
However, some limitations in the discrimination among researchers with
different publication habits are presented in this index. This index penalizes
selective researchers, distinguished by the large number of citations received,
as compared to large producers. In this work, two original sets of indexes, the
central area indexes and the central interval indexes, that complement the
h-index to include the central shape of the citation distribution, are proposed
and compared.


title: Combined neutron reflectometry and rheology

abstract:
  We have combined neutron reflectometry with rheology in order to investigate
the solid boundary of liquids and polymers under shear deformation. Our
approach allows one to apply a controlled stress to a material while resolving
the structural arrangements on the sub nanometer length scale with neutron
reflectivity, off-specular and small angle scattering at the same time. The
specularly reflected neutron intensity of a 20 % by weight solution of the
Pluronic F127 in deuterated water is evaluated. We find pronounced changes in
the near interface structure under applied deformation for surfaces with
different surface energies, which are correlated with changes in the storage
and loss modulus.


title: Simplifying Generalized Belief Propagation on Redundant Region Graphs

abstract:
  The cluster variation method has been developed into a general theoretical
framework for treating short-range correlations in many-body systems after it
was first proposed by Kikuchi in 1951. On the numerical side, a message-passing
approach called generalized belief propagation (GBP) was proposed by Yedidia,
Freeman and Weiss about a decade ago as a way of computing the minimal value of
the cluster variational free energy and the marginal distributions of clusters
of variables. However the GBP equations are often redundant, and it is quite a
non-trivial task to make the GBP iteration converges to a fixed point. These
drawbacks hinder the application of the GBP approach to finite-dimensional
frustrated and disordered systems.
  In this work we report an alternative and simple derivation of the GBP
equations starting from the partition function expression. Based on this
derivation we propose a natural and systematic way of removing the redundance
of the GBP equations. We apply the simplified generalized belief propagation
(SGBP) equations to the two-dimensional and the three-dimensional ferromagnetic
Ising model and Edwards-Anderson spin glass model. The numerical results
confirm that the SGBP message-passing approach is able to achieve satisfactory
performance on these model systems. We also suggest that a subset of the SGBP
equations can be neglected in the numerical iteration process without affecting
the final results.


title:
A note on weak convergence of the sequential multivariate empirical
  process under strong mixing

abstract:
  This article investigates weak convergence of the sequential $d$-dimensional
empirical process under strong mixing. Weak convergence is established for
mixing rates $\alpha_n = O(n^{-a})$, where $a>1$, which slightly improves upon
existing results in the literature that are based on mixing rates depending on
the dimension $d$.


title: Critical Point Wedge Filling

abstract:
  We present results of a microscopic density functional theory study of wedge
filling transitions, at a right-angle wedge, in the presence of dispersion-like
wall-fluid forces. Far from the corner the walls of the wedge show a
first-order wetting transition at a temperature $T_w$ which is progressively
closer to the bulk critical temperature $T_c$ as the strength of the wall
forces is reduced. In addition, the meniscus formed near the corner undergoes a
filling transition at a temperature $T_f<T_w$, the value of which is found to
be in excellent agreement with macroscopic predictions. We show that the
filling transition is {\it first-order} if it occurs far from the critical
point but is {\it continuous} if $T_f$ is close to $T_c$ even though the walls
still show first-order wetting behaviour. For this continuous transition the
distance of the meniscus from the apex grows as $\ell_w\approx
(T_f-T)^{-\beta_w}$ with critical exponent $\beta_w\approx 0.46 \pm 0.05$ in
good agreement with the phenomenological effective Hamiltonian prediction. Our
results suggest that critical filling transitions, with accompanying large
scale universal interfacial fluctuation effects, are more generic than thought
previously, and are experimentally accessible.


title:
Hadron energy response of the Iron Calorimeter detector at the
  India-based Neutrino Observatory

abstract:
  The results of a Monte Carlo simulation study of the hadron energy response
for the magnetized Iron CALorimeter detector, ICAL, proposed to be located at
the India-based Neutrino Observatory (INO) is presented. Using a GEANT4
modeling of the detector ICAL, interactions of atmospheric neutrinos with
target nuclei are simulated. The detector response to hadrons propagating
through it is investigated using the hadron hit multiplicity in the active
detector elements. The detector response to charged pions of fixed energy is
studied first, followed by the average response to the hadrons produced in
atmospheric neutrino interactions using events simulated with the NUANCE event
generator. The shape of the hit distribution is observed to fit the Vavilov
distribution, which reduces to a Gaussian at high energies. In terms of the
parameters of this distribution, we present the hadron energy resolution as a
function of hadron energy, and the calibration of hadron energy as a function
of the hit multiplicity. The energy resolution for hadrons is found to be in
the range 85% (for 1GeV) -- 36% (for 15 GeV).


title:
Experimental evidence for the coupling of Li-motion and structural
  distortions in LiMnPO$_4$

abstract:
  We present a detailed $^7$Li- and $^{31}$P-NMR study on single crystalline
LiMnPO$_4$ in the paramagnetic and antiferromagnetic phase (AFM, $T_N \sim$ 34
K). This allows us to determine the spin directions in the field-induced
spin-flop phase. In addition, the anisotropic dipolar hyperfine coupling tensor
of the $^7$Li- and $^{31}$P-nuclei is also fully determined by orientation and
temperature dependent NMR experiments and compared to the calculated values
from crystal structure data. Deviations of the experimental values from the
theoretical ones are discussed in terms of Mn disorder which is induced by
Li-disorder. In fact, the disorder in the Mn-sublattice is directly revealed by
our diffuse x-ray scattering data. The present results provide experimental
evidence for the Li-diffusion strongly coupling to structural distortions
within the MnPO$_4$ host, which is expected to significantly affect the
Li-mobility as well as the performance of batteries based on this material.


title: Splitting a single Cooper-pair with microwave light

abstract:
  We measure an aluminum superconducting double quantum dot and find that its
electrical impedance, specifically its quantum capacitance, depends on whether
or not it contains a single broken Cooper pair. In this way we are able to
observe, in real time, the thermally activated breaking and recombination of
Cooper pairs. Furthermore, we apply external microwave light and break single
Cooper pairs by the absorption of single microwave photons.


title: Higher-nodal collective modes in a resonantly interacting Fermi gas

abstract:
  We report on experimental investigations of longitudinal collective
oscillations in a highly elongated, harmonically trapped two-component Fermi
gas with resonantly tuned s-wave interactions ('unitary Fermi gas'). We focus
on higher-nodal axial modes, which in contrast to the elementary modes have
received little attention so far. We show how these modes can be efficiently
excited using a resonant local excitation scheme and sensitively analyzed by a
Fourier transformation of the detected time evolution of the axial density
profile. We study the temperature dependence of the mode frequencies across the
superfluid phase transition. The behavior is qualitatively different from the
elementary modes, where the mode frequencies are independent of the temperature
as long as the gas stays in the hydrodynamic regime. Our results are compared
to theoretical predictions based on Landau's two-fluid theory and available
experimental knowledge of the equation of state. The comparison shows excellent
agreement and thus both represents a sensitive test for the validity of the
theoretical approach and provides an independent test of the equation of state.
The present results obtained on modes of first-sound character represent
benchmarks for the observation of second-sound propagation and corresponding
oscillation modes.


title: Complementarity of direct and indirect Dark Matter detection experiments

abstract:
  We investigate the prospects for reconstructing the mass, spin-independent
and spin-dependent cross-sections of Dark Matter particles with a combination
of future direct detection experiments such as XENON1T, and the IceCube
neutrino telescope in the 86-string configuration including the DeepCore array.
We quantify the degree of complementarity between the two experiments by
adopting realistic values for their exposure, energy threshold and resolution.
Starting from benchmark models arising from a supersymmetric model with 25 free
parameters, we show that despite the stringent constraints set by the run with
79 strings, IceCube can help break the degeneracies in the Dark Matter
cross-section parameter space, even in the unfortunate case where it fails to
discover high energy neutrinos from the Sun. We also discuss how the
reconstruction of the Dark Matter particle parameters from the combined data
sets is affected by the uncertainties associated with the nuclear structure of
the target material in case of spin-dependent scattering and those associated
with astrophysical quantities such as the Dark Matter density and velocity
distribution.


title:
Study of piN->pipiN processes on polarized targets: Quantum environment
  and its dephasing interaction with particle scattering

abstract:
  Unitary evolution law describes isolated particle scattering processes in an
empty Minkowski spacetime. We put forward a hypothesis that the physical
Universe includes a quantum environment that interacts with particle scattering
processes. While the scattering process is governed by the S-matrix the
interaction evolves the produced state rho_f(S) to observed state rho_f(O). To
be consistent with the Standard Model this new interaction must be a pure
dephasing interaction governed by a non-unitary evolution law modifying the
phases of the amplitudes. We present the first test of the unitary evolution
law in particle scattering. The unitary evolution law evolves pure initial
states into pure final states in exclusive processes. This fact leads to 9
independent constraints on 16 components of angular intensities in piN->pipiN
processes. When expressed in terms of P-parity conserving transversity
amplitudes all 9 constraints are identities provided a single constrain on the
transversity amplitudes holds true. The constraint implies that the relative
phases between transverity amplitudes of the same naturality and transversity
must be 0 or +/- pi. All previous amplitude analyses of the piN->pipiN
processes found non-unitary relative phases in an apparent violation of the
unitary evolution law. The contrast between the predicted and the observed
relative phases presents an unambigous evidence for the existence of the
quantum environment and its pure dephasing interaction with particle scattering
processes.


title: Properties and composition of the $f_0(500)$ resonance

abstract:
  In this talk we review our recent developments on the understanding of the
nature of the f_0(500) resonance---or sigma meson---coming from the N_c
expansion, dispersion relations with Chiral Perturbation Theory, as well as
finite energy sum rules and semi-local duality.


title:
Boundedness of a class of bi-parameter square functions in the upper
  half-space

abstract:
  We consider a class of bi-parameter kernels and related square functions in
the upper half-space, and give an efficient proof of a boundedness criterion
for them. The proof uses modern probabilistic averaging methods and is based on
controlling double Whitney averages over good cubes.


title:
Carbon Impurities on Graphene Synthesized by Chemical Vapor Deposition
  on Platinum

abstract:
  We report nanocrystalline carbon impurities coexisting with graphene
synthesized via chemical vapor deposition (CVD) on platinum. We observe
micron-size island-like impurity layers, which can easily be mistaken for
second graphene layers in optical microscopy or secondary electron microscopy
(SEM). The island orientation depends on the crystalline orientation of the Pt,
as shown by electron backscatter diffraction(EBSD), indicating growth of
amorphous carbon below graphene. Dark-field TEM indicates that in addition to
uniform single-crystal graphene, our sample is decorated with nanocrystalline
carbon impurities with a spatially inhomogeneous distribution. Raman spectra
show a large D peak, however electrical characterization shows high mobility
(~6,000 cm2/Vs), indicating a limitation for Raman spectroscopy in
characterizing the electronic quality of graphene.


title: Spectral gap for the Kac model with hard sphere collisions

abstract: We prove the analog of the Kac conjecture for hard sphere collisions


title: Simulation Study of Ge p-type Nanowire Schottky Barrier MOSFETs

abstract:
  Ambipolar currents in Germanium p-type nanowire Schottky barrier MOSFETs were
calculated fully quantum-mechanically by using the multi-band k.p method and
the non-equilibrium Green's function approach. We investigated the performance
of devices with 100, 110, and 111 channel orientations, respectively, by
varying the nanowire width, Schottky barrier height, and EOT. The 111 oriented
devices showed the best performance. In comparison to Si as a channel material,
Ge is more desirable because more current can be injected into the channel,
resulting in steeper subthreshold slope and higher on-state current. Our
calculations predict that the Ge channel devices should have an EOT gain of
0.2-0.5 nm over Si channel devices.


title:
Linear relation for wind-blown bubble sizes of main-sequence OB stars in
  a molecular environment and implication for supernova progenitors

abstract:
  We find a linear relationship between the size of a massive star's
main-sequence bubble in a molecular environment and the star's initial mass:
R_b \approx 1.22M/Msun - 9.16 pc, assuming a constant interclump pressure.
Since stars in the mass range of 8 to 25-30 Msun will end their evolution in
the red supergiant phase without launching a Wolf-Rayet wind, the main-sequence
wind-blown bubbles are mainly responsible for the extent of molecular gas
cavities, while the effect of the photoionization is comparatively small. This
linear relation can thus be used to infer the masses of the massive star
progenitors of supernova remnants (SNRs) that are discovered to evolve in
molecular cavities, while few other means are available for inferring
properties of SNR progenitors. We have used this method to estimate the initial
masses of the progenitors of eight SNRs: Kes 69, Kes 75, Kes 78, 3C 396, 3C
397, HC 40, Vela, and RX J1713-3946.