title:
Shock-Enhanced C+ Emission and the Detection of H2O from Stephan's
  Quintet's Group-Wide Shock using Herschel

abstract:
  We present the first Herschel spectroscopic detections of the [OI]63 and
[CII]158 micron fine-structure transitions, and a single para-H2O line from the
35 x 15 kpc^2 shocked intergalactic filament in Stephan's Quintet. The filament
is believed to have been formed when a high-speed intruder to the group
collided with clumpy intergroup gas. Observations with the PACS spectrometer
provide evidence for broad (> 1000 km s^-1) luminous [CII] line profiles, as
well as fainter [OI]63micron emission. SPIRE FTS observations reveal water
emission from the p-H2O (111-000) transition at several positions in the
filament, but no other molecular lines. The H2O line is narrow, and may be
associated with denser intermediate-velocity gas experiencing the strongest
shock-heating. The [CII]/PAH{tot) and [CII]/FIR ratios are too large to be
explained by normal photo-electric heating in PDRs. HII region excitation or
X-ray/Cosmic Ray heating can also be ruled out. The observations lead to the
conclusion that a large fraction the molecular gas is diffuse and warm. We
propose that the [CII], [OI] and warm H2 line emission is powered by a
turbulent cascade in which kinetic energy from the galaxy collision with the
IGM is dissipated to small scales and low-velocities, via shocks and turbulent
eddies. Low-velocity magnetic shocks can help explain both the [CII]/[OI]
ratio, and the relatively high [CII]/H2 ratios observed. The discovery that
[CII] emission can be enhanced, in large-scale turbulent regions in collisional
environments has implications for the interpretation of [CII] emission in
high-z galaxies.


title: Bounding $S(t)$ and $S_1(t)$ on the Riemann hypothesis

abstract:
  Let $\pi S(t)$ denote the argument of the Riemann zeta-function, $\zeta(s)$,
at the point $s=\frac{1}{2}+it$. Assuming the Riemann hypothesis, we present
two proofs of the bound $$ |S(t)| \leq \left(\tfrac{1}{4} + o(1)
\right)\tfrac{\log t}{\log \log t} $$ for large $t$. This improves a result of
Goldston and Gonek by a factor of 2. The first method consists in bounding the
auxiliary function $S_1(t) = \int_0^{t} S(u) du$ using extremal functions
constructed by Carneiro, Littmann and Vaaler. We then relate the size of $S(t)$
to the size of the functions $S_1(t\pm h)-S_1(t)$ when $h\asymp 1/\log\log t$.
The alternative approach bounds $S(t)$ directly, relying on the solution of the
Beurling-Selberg extremal problem for the odd function $f(x) =
\arctan\left(\tfrac{1}{x}\right) - \tfrac{x}{1 + x^2}$. This draws upon recent
work by Carneiro and Littmann.


title: Entire approximations for a class of truncated and odd functions

abstract:
  We solve the problem of finding optimal entire approximations of prescribed
exponential type (unrestricted, majorant and minorant) for a class of truncated
and odd functions with a shifted exponential subordination, minimizing the
$L^1(\R)$-error. The class considered here includes new examples such as the
truncated logarithm and truncated shifted power functions. This paper is the
counterpart of the works of Carneiro and Vaaler (Some extremal functions in
Fourier analysis, Part II in Trans. Amer. Math. Soc. 362 (2010), 5803-5843;
Part III in Constr. Approx. 31, No. 2 (2010), 259--288), where the analogous
problem for even functions was treated.


title: Selective Equal-Spin Andreev Reflections Induced by Majorana Fermions

abstract:
  In this work, we find that Majorana fermions induce selective equal spin
Andreev reflections (SESARs), in which incoming electrons with certain spin
polarization in the lead are reflected as counter propagating holes with the
same spin. The spin polarization direction of the electrons of this Andreev
reflected channel is selected by the Majorana fermions. Moreover, electrons
with opposite spin polarization are always reflected as electrons with
unchanged spin. As a result, the charge current in the lead is spin-polarized.
Therefore, a topological superconductor which supports Majorana fermions can be
used as a novel device to create fully spin-polarized currents in paramagnetic
leads. We point out that SESARs can also be used to detect Majorana fermions in
topological superconductors.


title: On the variation of maximal operators of convolution type

abstract:
  In this paper we study the regularity properties of two maximal operators of
convolution type: the heat flow maximal operator (associated to the Gauss
kernel) and the Poisson maximal operator (associated to the Poisson kernel). In
dimension $d=1$ we prove that these maximal operators do not increase the
$L^p$-variation of a function for any $p \geq 1$, while in dimensions $d>1$ we
obtain the corresponding results for the $L^2$-variation. Similar results are
proved for the discrete versions of these operators.


title: Some categories of modules for toroidal Lie algebras

abstract:
  In this paper, we use basic formal variable techniques to study certain
categories of modules for the toroidal Lie algebra $\tau$. More specifically,
we define and study two categories $\mathcal{E}_{\tau}$ and
$\mathcal{C}_{\tau}$ of $\tau$-modules using generating functions, where
$\mathcal{E}_{\tau}$ is proved to contain the evaluation modules while
$\mathcal{C}_{\tau}$ contains certain restricted $\tau$-modules, the evaluation
modules, and their tensor product modules. Furthermore, we classify the
irreducible integrable modules in categories $\mathcal{E}_{\tau}$ and
$\mathcal{C}_{\tau}$.


title: Magnetism and local structure in low-dimensional, Mott insulating GdTiO3

abstract:
  Cation displacements, oxygen octahedral tilts, and magnetism of epitaxial,
ferrimagnetic, insulating GdTiO3 films sandwiched between cubic SrTiO3 layers
are studied using scanning transmission electron microscopy and magnetization
measurements. With decreasing GdTiO3 film thickness, structural (GdFeO3-type)
distortions are reduced, concomitant with a reduction in the Curie temperature.
Ferromagnetism persists to smaller deviations from the cubic perovskite
structure than is the case for the bulk rare earth titanates. The results
indicate that the FM ground state is controlled by the narrow bandwidth,
exchange and orbital ordering, and only to second order depends on amount of
the GdFeO3-type distortion.


title: The Evolution of Proto-Strange Stars

abstract:
  We perform 1D calculations of neutrino opacities inside a young "strange
star" assumed to be the result of the conversion process of a normal neutron
object. We evaluate the deleptonization and cooling timescales, which happen to
be longer than the proto-NS analogues, and preliminary address the features of
the emerging neutrino signal.


title: Integrable representations of affine A(m, n) and C(m) superalgebras

abstract:
  Rao and Zhao classified the irreducible integrable modules with finite
dimensional weight spaces for the untwisted affine superalgebras which are not
$\hat{A}(m,n)$ ($m\ne n$) or $\hat{C}(m)$. Here we treat the latter affine
superalgebras to complete the classification. The problem boils down to
classifying the irreducible zero-level integrable modules with finite
dimensional weight spaces for these affine superalgebras, which is solved in
this paper. We note in particular that such modules for $\hat{A}(m,n)$ ($m\ne
n$) and $\hat{C}(m)$ must be of highest weight type, but are not necessarily
loop modules. This is in sharp contrast to the cases of ordinary affine
algebras and the other types of affine superalgebras.


title:
A Fault-Tolerant Scheme of Holonomic Quantum Computation on Stabilizer
  Codes with Robustness to Low-weight Thermal Noise

abstract:
  We show an equivalence relation between fault-tolerant circuits for a
stabilizer code and fault-tolerant adiabatic processes for holonomic quantum
computation (HQC), in the case where quantum information is encoded in the
degenerated ground space of the system Hamiltonian. By this equivalence, we can
systematically construct a fault-tolerant HQC scheme, which can geometrically
implement a universal set of encoded quantum gates by adiabatically deforming
the system Hamiltonian. During this process, quantum information is protected
from low weight thermal excitations by an energy gap that does not change with
the problem size.


title: On the endpoint regularity of discrete maximal operators

abstract:
  Given a discrete function $f:\Z^d \to \R$ we consider the maximal operator
$$Mf(\vec{n}) = \sup_{r\geq0} \frac{1}{N(r)} \sum_{\vec{m} \in \bar{\Omega}_r}
\big|f(\vec{n} + \vec{m})\big|,$$ where $\big\{\bar{\Omega}_r\big\}_{r \geq 0}$
are dilations of a convex set $\Omega$ (open, bounded and with Lipschitz
boudary) containing the origin and $N(r)$ is the number of lattice points
inside $\bar{\Omega}_r$. We prove here that the operator $f \mapsto \nabla M f$
is bounded and continuous from $l^1(\Z^d)$ to $l^1(\Z^d)$. We also prove the
same result for the non-centered version of this discrete maximal operator.


title: Rank-frequency relation for Chinese characters

abstract:
  We show that the Zipf's law for Chinese characters perfectly holds for
sufficiently short texts (few thousand different characters). The scenario of
its validity is similar to the Zipf's law for words in short English texts. For
long Chinese texts (or for mixtures of short Chinese texts), rank-frequency
relations for Chinese characters display a two-layer, hierarchic structure that
combines a Zipfian power-law regime for frequent characters (first layer) with
an exponential-like regime for less frequent characters (second layer). For
these two layers we provide different (though related) theoretical descriptions
that include the range of low-frequency characters (hapax legomena). The
comparative analysis of rank-frequency relations for Chinese characters versus
English words illustrates the extent to which the characters play for Chinese
writers the same role as the words for those writing within alphabetical
systems.


title: Integrable functions within the theory of schemic motivic integration

abstract:
  We develop notions of integrable functions within the theory of schemic
motivic integration.


title: Conditions for supernovae driven galactic winds

abstract:
  We point out that the commonly assumed condition for galactic outflows, that
supernovae (SNe) heating is efficient in the central regions of starburst
galaxies, suffers from invalid assumptions. We show that a large filling factor
of hot ($\ge 10^6$ K) gas is difficult to achieve through SNe heating,
irrespective of the initial gas temperature and density, and of its being
uniform or clumpy. We instead suggest that correlated supernovae from OB
associations in molecular clouds in the central region can drive powerful
outflows if the molecular surface density is $> 10^3$ M$_{\odot}$ pc$^{-2}$.


title:
Practical Matrix Completion and Corruption Recovery using Proximal
  Alternating Robust Subspace Minimization

abstract:
  Low-rank matrix completion is a problem of immense practical importance.
Recent works on the subject often use nuclear norm as a convex surrogate of the
rank function. Despite its solid theoretical foundation, the convex version of
the problem often fails to work satisfactorily in real-life applications. Real
data often suffer from very few observations, with support not meeting the
random requirements, ubiquitous presence of noise and potentially gross
corruptions, sometimes with these simultaneously occurring.
  This paper proposes a Proximal Alternating Robust Subspace Minimization
(PARSuMi) method to tackle the three problems. The proximal alternating scheme
explicitly exploits the rank constraint on the completed matrix and uses the
$\ell_0$ pseudo-norm directly in the corruption recovery step. We show that the
proposed method for the non-convex and non-smooth model converges to a
stationary point. Although it is not guaranteed to find the global optimal
solution, in practice we find that our algorithm can typically arrive at a good
local minimizer when it is supplied with a reasonably good starting point based
on convex optimization. Extensive experiments with challenging synthetic and
real data demonstrate that our algorithm succeeds in a much larger range of
practical problems where convex optimization fails, and it also outperforms
various state-of-the-art algorithms.


title: Nitrogen Abundances and the Distance Moduli of the Pleiades and Hyades

abstract:
  Recent reanalyses of HIPPARCOS parallax data confirm a previously noted
discrepancy with the Pleiades distance modulus estimated from main-sequence
fitting in the color-magnitude diagram. One proposed explanation of this
distance modulus discrepancy is a Pleiades He abundance that is significantly
larger than the Hyades value. We suggest that, based on our theoretical and
observational understanding of Galactic chemical evolution, nitrogen abundances
may serve as a proxy for helium abundances of disk stars. Utilizing
high-resolution near-UV Keck/HIRES spectroscopy, we determine N abundances in
the Pleiades and Hyades dwarfs from NH features in the 3330 Ang region. While
our Hyades N abundances show a modest 0.2 dex trend over a 800 K Teff range, we
find the Pleiades N abundance (by number) is 0.13+/-0.05 dex lower than in the
Hyades for stars in a smaller overlapping Teff range around 6000 K; possible
systematic errors in the lower Pleiades N abundance result are estimated to be
at the <0.10 dex level. Our results indicate [N/Fe]=0 for both the Pleiades and
Hyades, consistent with the ratios exhibited by local Galactic disk field stars
in other studies. If N production is a reliable tracer of He production in the
disk, then our results suggest the Pleiades He abundance is no larger than that
in the Hyades. This finding is supported by the relative Pleiades-Hyades C, O,
and Fe abundances interpreted in the current context of Galactic chemical
evolution, and is resistant to the effects on our derived N abundances of a He
abundance difference like that needed to explain the Pleiades distance modulus
discrepancy. A physical explanation of the Pleiades distance modulus
discrepancy does not appear to be related to He abundance.


title:
Projection onto the probability simplex: An efficient algorithm with a
  simple proof, and an application

abstract:
  We provide an elementary proof of a simple, efficient algorithm for computing
the Euclidean projection of a point onto the probability simplex. We also show
an application in Laplacian K-modes clustering.


title:
Ubiquitous healthcare monitoring system using integrated triaxial
  accelerometer,spo2 and location sensors

abstract:
  Ubiquitous healthcare has become one of the prominent areas of research
inorder to address the challenges encountered in healthcare environment. In
contribution to this area, this study developed a system prototype that
recommends diagonostic services based on physiological data collected in real
time from a distant patient. The prototype uses WBAN body sensors to be worn by
the individual and an android smart phone as a personal server. Physiological
data is collected and uploaded to a Medical Health Server (MHS) via
GPRS/internet to be analysed. Our implemented prototype monitors the activity,
location and physiological data such as SpO2 and Heart Rate (HR) of the elderly
and patients in rehabilitation. The uploaded information can be accessed in
real time by medical practitioners through a web application.


title:
A Comparism of the Performance of Supervised and Unsupervised Machine
  Learning Techniques in evolving Awale/Mancala/Ayo Game Player

abstract:
  Awale games have become widely recognized across the world, for their
innovative strategies and techniques which were used in evolving the agents
(player) and have produced interesting results under various conditions. This
paper will compare the results of the two major machine learning techniques by
reviewing their performance when using minimax, endgame database, a combination
of both techniques or other techniques, and will determine which are the best
techniques.


title:
Benchmarking GEANT4 nuclear models for hadron therapy with 95
  MeV/nucleon carbon ions

abstract:
  In carbon-therapy, the interaction of the incoming beam with human tissues
may lead to the production of a large amount of nuclear fragments and secondary
light particles. An accurate estimation of the biological dose deposited into
the tumor and the surrounding healthy tissues thus requires sophisticated
simulation tools based on nuclear reaction models. The validity of such models
requires intensive comparisons with as many sets of experimental data as
possible. Up to now, a rather limited set of double di erential carbon
fragmentation cross sections have been measured in the energy range used in
hadrontherapy (up to 400 MeV/A). However, new data have been recently obtained
at intermediate energy (95 MeV/A). The aim of this work is to compare the
reaction models embedded in the GEANT4 Monte Carlo toolkit with these new data.
The strengths and weaknesses of each tested model, i.e.
G4BinaryLightIonReaction, G4QMDReaction and INCL++, coupled to two di fferent
de-excitation models, i.e. the generalized evaporation model and the Fermi
break-up are discussed.


title: Linear and cyclic distance-three labellings of trees

abstract:
  Given a finite or infinite graph $G$ and positive integers $\ell, h_1, h_2,
h_3$, an $L(h_1, h_2, h_3)$-labelling of $G$ with span $\ell$ is a mapping $f:
V(G) \rightarrow \{0, 1, 2, \ldots, \ell\}$ such that, for $i = 1, 2, 3$ and
any $u, v \in V(G)$ at distance $i$ in $G$, $|f(u) - f(v)| \geq h_i$. A $C(h_1,
h_2, h_3)$-labelling of $G$ with span $\ell$ is defined similarly by requiring
$|f(u) - f(v)|_{\ell} \ge h_i$ instead, where $|x|_{\ell} = \min\{|x|,
\ell-|x|\}$. The minimum span of an $L(h_1, h_2, h_3)$-labelling, or a $C(h_1,
h_2, h_3)$-labelling, of $G$ is denoted by $\lambda_{h_1,h_2,h_3}(G)$, or
$\sigma_{h_1,h_2,h_3}(G)$, respectively. Two related invariants,
$\lambda^*_{h_1,h_2,h_3}(G)$ and $\sigma^*_{h_1,h_2,h_3}(G)$, are defined
similarly by requiring further that for every vertex $u$ there exists an
interval $I_u$ $\mod~(\ell + 1)$ or $\mod~\ell$, respectively, such that the
neighbours of $u$ are assigned labels from $I_u$ and $I_v \cap I_w = \emptyset$
for every edge $vw$ of $G$. A recent result asserts that the
$L(2,1,1)$-labelling problem is NP-complete even for the class of trees. In
this paper we study the $L(h, p, p)$ and $C(h, p, p)$ labelling problems for
finite or infinite trees $T$ with finite maximum degree, where $h \ge p \ge 1$
are integers. We give sharp bounds on $\lambda_{h,p,p}(T)$,
$\lambda^*_{h,p,p}(T)$, $\sigma_{h, 1, 1}(T)$ and $\sigma^*_{h, 1, 1}(T)$,
together with linear time approximation algorithms for the $L(h,p,p)$-labelling
and the $C(h, 1, 1)$-labelling problems for finite trees. We obtain the precise
values of these four invariants for a few families of trees. We give sharp
bounds on $\sigma_{h,p,p}(T)$ and $\sigma^*_{h,p,p}(T)$ for trees with maximum
degree $\Delta \le h/p$, and as a special case we obtain that
$\sigma_{h,1,1}(T) = \sigma^*_{h,1,1}(T) = 2h + \Delta - 1$ for any tree $T$
with $\Delta \le h$.


title:
Stability of relativistic Bondi accretion in Schwarzschild-(anti-)de
  Sitter spacetimes

abstract:
  In a recent paper we investigated stationary, relativistic Bondi-type
accretion in Schwarzschild-(anti-)de Sitter spacetimes. Here we study their
stability, using the method developed by Moncrief. The analysis applies to
perturbations satisfying the potential flow condition. We prove that global
isothermal flows in Schwarzschild-anti-de Sitter spacetimes are stable,
assuming the test-fluid approximation. Isothermal flows in Schwarzschild-de
Sitter geometries and polytropic flows in Schwarzschild-de Sitter and
Schwarzschild-anti-de Sitter spacetimes can be stable, under suitable boundary
conditions.


title: Combinatorial optimization with 2-joins

abstract:
  A 2-join is an edge cutset that naturally appears in decomposition of several
classes of graphs closed under taking induced subgraphs, such as perfect graphs
and claw-free graphs. In this paper we construct combinatorial polynomial time
algorithms for finding a maximum weighted clique, a maximum weighted stable set
and an optimal coloring for a class of perfect graphs decomposable by 2-joins:
the class of perfect graphs that do not have a balanced skew partition, a
2-join in the complement, nor a homogeneous pair. The techniques we develop are
general enough to be easily applied to finding a maximum weighted stable set
for another class of graphs known to be decomposable by 2-joins, namely the
class of even-hole-free graphs that do not have a star cutset.
  We also give a simple class of graphs decomposable by 2-joins into bipartite
graphs and line graphs, and for which finding a maximum stable set is NP-hard.
This shows that having holes all of the same parity gives essential properties
for the use of 2-joins in computing stable sets.


title:
Thermodynamics of the spin-1/2 two-leg ladder compound
  $(C_{5}H_{12}N)_{2} CuBr_{4}$

abstract:
  The thermodynamic behavior of the spin $S=1/2$ antiferromagnetic two-leg
ladder compound $(C_{5}H_{12}N)_{2} CuBr_{4}$ in a uniform magnetic field is
studied using numerical and analytical approaches. The entropy $S(H,T)$ and
specific heat $C(H,T)$ are calculated. The specific heat shows various
behaviors in different regions of the magnetic field. The field-dependence of
the specific heat is almost symmetric about the average of quantum critical
fields in complete agreement with experimental results. In addition, it is
found that during an adiabatic demagnetization process, temperature drops in
the vicinity of the field induced zero-temperature quantum phase transitions.


title: Operating mode of high pressure straws with high spatial resolution

abstract:
  The article presents results of studying the operating mode of thin-walled
drift tubes (straws) at flushing it with a high-pressure gas mixture, which
allowed obtaining extremely high spatial resolution for straw detectors. The
results of studying the radiation ageing of straws operating in this mode are
also described.


title: On the Positivity Problem for Simple Linear Recurrence Sequences

abstract:
  Given a linear recurrence sequence (LRS) over the integers, the Positivity
Problem} asks whether all terms of the sequence are positive. We show that, for
simple LRS (those whose characteristic polynomial has no repeated roots) of
order 9 or less, Positivity is decidable, with complexity in the Counting
Hierarchy.


title:
$\varphi$-strong solutions and uniqueness of 1-dimensional stochastic
  differential equations

abstract:
  In this paper we consider stochastic differential equations with
discontinuous diffusion coefficient of varying sign, for which weak existence
and uniqueness holds but strong uniqueness fails. We introduce the notion of
$\varphi $-strong solution, and we show that under certain conditions on the
diffusion coefficient a $\varphi$-strong solution exists and it is unique. We
also give a construction of a $\varphi$-strong solution and a weak solution in
terms of the notion of \emph{i.i.d. sign choice} introduced in the paper, and
we give an explicit representation of the set of all weak solutions, which in
particular explains the reason for the lack of strong existence and uniqueness.


title: Experimental realization of quantum zeno dynamics

abstract:
  It is generally impossible to probe a quantum system without disturbing it.
However, it is possible to exploit the back-action of quantum measurements and
strong couplings to tailor and protect the coherent evolution of a quantum
system. This is a profound and counterintuitive phenomenon known as quantum
Zeno dynamics (QZD). Here we demonstrate QZD with a rubidium Bose-Einstein
condensate in a five-level Hilbert space. We harness measurements and strong
couplings to dynamically disconnect different groups of quantum states and
constrain the atoms to coherently evolve inside a two-level subregion. In
parallel to the foundational importance due to the realization of a dynamical
superselection rule and the theory of quantum measurements, this is an
important step forward in protecting and controlling quantum dynamics and,
broadly speaking, quantum information processing.


title: Finding an induced subdivision of a digraph

abstract:
  We consider the following problem for oriented graphs and digraphs: Given an
oriented graph (digraph) $G$, does it contain an induced subdivision of a
prescribed digraph $D$? The complexity of this problem depends on $D$ and on
whether $G$ must be an oriented graph or is allowed to contain 2-cycles. We
give a number of examples of polynomial instances as well as several
NP-completeness proofs.


title:
On Discovering Electromagnetic Emission from Neutron Star Mergers: The
  Early Years of Two Gravitational Wave Detectors

abstract:
  We present the first simulation addressing the prospects of finding an
electromagnetic (EM) counterpart to gravitational wave detections (GW) during
the early years of only two advanced interferometers. The perils of such a
search may have appeared insurmountable when considering the coarse ring-shaped
GW localizations spanning thousands of deg^2 using time-of-arrival information
alone. We show that leveraging the amplitude and phase information of the
predicted GW signal narrows the localization to arcs with a median area of only
~250 deg^2, thereby making an EM search tractable. Based on the locations and
orientations of the two LIGO detectors, we find that the GW sensitivity is
limited to one polarization and thus to only two sky quadrants. Thus, the rates
of GW events with two interferometers is only ~40% of the rate with three
interferometers of similar sensitivity. Another important implication of the
sky quadrant bias is that EM observatories in North America and Southern Africa
would be able to systematically respond to GW triggers several hours sooner
than Russia and Chile. Given the larger sky areas and the relative proximity of
detected mergers, 1m-class telescopes with very wide-field cameras are well
positioned for the challenge of finding an EM counterpart. Identification of
the EM counterpart amidst the even larger numbers of false positives further
underscores the importance of building a comprehensive catalog of foreground
stellar sources, background AGN and potential host galaxies in the local
universe.


title: A New Chase-type Soft-decision Decoding Algorithm for Reed-Solomon Codes

abstract:
  This paper addresses three relevant issues arising in designing Chase-type
algorithms for Reed-Solomon codes: 1) how to choose the set of testing
patterns; 2) given the set of testing patterns, what is the optimal testing
order in the sense that the most-likely codeword is expected to appear earlier;
and 3) how to identify the most-likely codeword. A new Chase-type soft-decision
decoding algorithm is proposed, referred to as tree-based Chase-type algorithm.
The proposed algorithm takes the set of all vectors as the set of testing
patterns, and hence definitely delivers the most-likely codeword provided that
the computational resources are allowed. All the testing patterns are arranged
in an ordered rooted tree according to the likelihood bounds of the possibly
generated codewords. While performing the algorithm, the ordered rooted tree is
constructed progressively by adding at most two leafs at each trial. The
ordered tree naturally induces a sufficient condition for the most-likely
codeword. That is, whenever the proposed algorithm exits before a preset
maximum number of trials is reached, the output codeword must be the
most-likely one. When the proposed algorithm is combined with Guruswami-Sudan
(GS) algorithm, each trial can be implement in an extremely simple way by
removing one old point and interpolating one new point. Simulation results show
that the proposed algorithm performs better than the recently proposed
Chase-type algorithm by Bellorado et al with less trials given that the maximum
number of trials is the same. Also proposed are simulation-based performance
bounds on the MLD algorithm, which are utilized to illustrate the
near-optimality of the proposed algorithm in the high SNR region. In addition,
the proposed algorithm admits decoding with a likelihood threshold, that
searches the most-likely codeword within an Euclidean sphere rather than a
Hamming sphere.


title: Hyper-Graph Based Database Partitioning for Transactional Workloads

abstract:
  A common approach to scaling transactional databases in practice is
horizontal partitioning, which increases system scalability, high availability
and self-manageability. Usu- ally it is very challenging to choose or design an
optimal partitioning scheme for a given workload and database. In this
technical report, we propose a fine-grained hyper-graph based database
partitioning system for transactional work- loads. The partitioning system
takes a database, a workload, a node cluster and partitioning constraints as
input and out- puts a lookup-table encoding the final database partitioning
decision. The database partitioning problem is modeled as a multi-constraints
hyper-graph partitioning problem. By deriving a min-cut of the hyper-graph, our
system can min- imize the total number of distributed transactions in the
workload, balance the sizes and workload accesses of the partitions and satisfy
all the partition constraints imposed. Our system is highly interactive as it
allows users to im- pose partition constraints, watch visualized partitioning
ef- fects, and provide feedback based on human expertise and indirect domain
knowledge for generating better partition- ing schemes.


title: Assembly and Installation of the Daya Bay Antineutrino Detectors

abstract:
  The Daya Bay reactor antineutrino experiment is designed to make a precision
measurement of the neutrino mixing angle theta13, and recently made the
definitive discovery of its nonzero value. It utilizes a set of eight,
functionally identical antineutrino detectors to measure the reactor flux and
spectrum at baselines of 300 - 2000m from the Daya Bay and Ling Ao Nuclear
Power Plants. The Daya Bay antineutrino detectors were built in an above-ground
facility and deployed side-by-side at three underground experimental sites near
and far from the nuclear reactors. This configuration allows the experiment to
make a precision measurement of reactor antineutrino disappearance over km-long
baselines and reduces relative systematic uncertainties between detectors and
nuclear reactors. This paper describes the assembly and installation of the
Daya Bay antineutrino detectors.


title: Multi-occupation field generates the Borel-sigma-field of loops

abstract:
  In this article, we consider the space of c\`{a}dl\`{a}g loops on a Polish
space $S$. The loop space can be equipped with a ``Skorokhod'' metric.
Moreover, it is Polish under this metric. Our main result is to prove that the
Borel-$\sigma$-field on the space of loops is generated by a class of loop
functionals: the multi-occupation field. This result generalizes the result in
the discrete case, see \cite{loop}.


title: Large induced subgraphs via triangulations and CMSO

abstract:
  We obtain an algorithmic meta-theorem for the following optimization problem.
Let \phi\ be a Counting Monadic Second Order Logic (CMSO) formula and t be an
integer. For a given graph G, the task is to maximize |X| subject to the
following: there is a set of vertices F of G, containing X, such that the
subgraph G[F] induced by F is of treewidth at most t, and structure (G[F],X)
models \phi.
  Some special cases of this optimization problem are the following generic
examples. Each of these cases contains various problems as a special subcase:
  1) "Maximum induced subgraph with at most l copies of cycles of length 0
modulo m", where for fixed nonnegative integers m and l, the task is to find a
maximum induced subgraph of a given graph with at most l vertex-disjoint cycles
of length 0 modulo m.
  2) "Minimum \Gamma-deletion", where for a fixed finite set of graphs \Gamma\
containing a planar graph, the task is to find a maximum induced subgraph of a
given graph containing no graph from \Gamma\ as a minor.
  3) "Independent \Pi-packing", where for a fixed finite set of connected
graphs \Pi, the task is to find an induced subgraph G[F] of a given graph G
with the maximum number of connected components, such that each connected
component of G[F] is isomorphic to some graph from \Pi.
  We give an algorithm solving the optimization problem on an n-vertex graph G
in time O(#pmc n^{t+4} f(t,\phi)), where #pmc is the number of all potential
maximal cliques in G and f is a function depending of t and \phi\ only. We also
show how a similar running time can be obtained for the weighted version of the
problem. Pipelined with known bounds on the number of potential maximal
cliques, we deduce that our optimization problem can be solved in time
O(1.7347^n) for arbitrary graphs, and in polynomial time for graph classes with
polynomial number of minimal separators.


title:
Shear Thickening in Concentrated Soft Sphere Colloidal Suspensions: A
  Shear Induced Phase Transition

abstract:
  A model of shear thickening in dense suspensions of Brownian soft sphere
colloidal particles is established. It suggests that shear thickening in soft
sphere suspensions can be interpreted as a shear induced phase transition.
Based on a Landau model of the coagulation transition of stabilized colloidal
particles, taking the coupling between order parameter fluctuations and the
local strain-field into account, the model suggests the occurrence of clusters
of coagulated particles (subcritical bubbles) by applying a continuous shear
perturbation.The critical shear stress of shear thickening in soft sphere
suspensions is derived while reversible shear thickening and irreversible shear
thickening have the same origin. The comparison of the theory with an
experimental investigation of electrically stabilized colloidal suspensions
confirms the presented approach.


title:
Beam polarization effects in the radiative production of lightest
  neutralinos in $e^+ e^-$ collisions in supersymmetric grand unified models

abstract:
  We study the production of the lightest neutralinos in the process $e^+ e^-
\rightarrow \chi_1^0 \chi_1^0 \gamma$ in supersymmetric grand unified models
for the International Linear Collider Energies with longitudinally polarized
beams. We consider cases where the standard model gauge group is unified into
the grand unified gauge groups SU(5), or SO(10). We have carried out a
comprehensive study of this process in the SU(5) and SO(10) grand unified
theories which includes the QED radiative corrections. We compare and contrast
the dependence of the signal cross section on the grand unified gauge group,
and on the different representations of the grand unified gauge group, when the
the electron and positron beams are longitudinally polarized. To assess the
feasibility of experimentally observing the radiative production process, we
have also considered in detail the background to this process coming from the
radiative neutrino production process $e^+ e^- \rightarrow \nu \bar\nu \gamma$
with longitudinally polarized electron and positron beams. In addition we have
also considered the supersymmetric background coming from the radiative
production of scalar neutrinos in the process $e^+ e^- \rightarrow \tilde \nu
\tilde\nu^* \gamma$ with longitudinally polarized beams. The process can be a
major background to the radiative production of neutralinos when the scalar
neutrinos decay invisibly.


title: Dyson's Ranks and Appell-Lerch Sums

abstract:
  Denote by $p(n)$ the number of partitions of $n$ and by $N(a,M;n)$ the number
of partitions of $n$ with rank congruent to $a$ modulo $M$. We find and prove a
general formula for Dyson's ranks by considering the deviation of the ranks
from the average: \begin{equation*} D(a,M) := \sum_{n=
0}^{\infty}\left(N(a,M;n) - \frac{p(n)}{M}\right) q^n. \end{equation*} Using
Appell--Lerch sum properties we decompose $D(a,M)$ into modular and mock
modular parts so that the mock modular component is supported on certain
arithmetic progressions, whose modulus we can control. Using our decomposition,
we show how our formula gives as a straightforward consequence Atkin and
Swinnerton-Dyer's results on ranks as well as Bringmann, Ono, and Rhoades's
results on Maass forms. We also apply our techniques to a variation of Dyson's
ranks due to Berkovitch and Garvan.


title:
Superfluid-Insulator transition of quantum Hall domain walls in bilayer
  graphene

abstract:
  We consider the zero-filled quantum-Hall ferromagnetic state of bilayer
graphene subject to a kink-like perpendicular electric field, which generates
domain walls in the electronic state and low-energy collective modes confined
to move along them. In particular, it is shown that two pairs of collective
helical modes are formed at opposite sides of the kink, each pair consisting of
modes with identical helicities. We derive an effective field-theoretical model
of these modes in terms of two weakly coupled anisotropic quantum spin-ladders,
with parameters tunable through control of the electric and magnetic fields.
This yields a rich phase diagram, where due to the helical nature of the modes,
distinct phases possess very different charge conduction properties. Most
notably, this system can potentially exhibit a transition from a superfluid to
an insulating phase.


title: Maximally reducible monodromy of bivariate hypergeometric systems

abstract:
  We investigate branching of solutions to holonomic bivariate hypergeometric
systems of Horn's type. Special attention is paid to the invariant subspace of
Puiseux polynomial solutions. We mainly study Horn systems defined by
simplicial configurations and Horn systems whose Ore-Sato polygons are either
zonotopes or Minkowski sums of a triangle and segments proportional to its
sides. We prove a necessary and sufficient condition for the monodromy
representation to be maximally reducible, that is, for the space of holomorphic
solutions to split into the direct sum of one-dimensional invariant subspaces.


title: Sextans' cold substructures as a dynamical judge: Core, Cusp or MOND?

abstract:
  The cold dark matter model predicts cuspy dark matter halos. However, it has
been found that, in some low-mass galaxies, cored dark halos provide a better
description of their internal dynamics. Here we give constraints on the dark
halo profile in the Sextans dwarf spheroidal galaxy by studying the longevity
of two cold kinematic substructures detected in this galaxy. We perform N-body
simulations of a stellar clump in the Sextans dwarf galaxy, including a live
dark matter halo and the main stellar component. We find that, if the dark halo
is cuspy, stellar clumps orbiting with semi-major axis ~400 pc are disrupted in
~5 Gyr, even if the clump is initially as compact stellar cluster with a radius
of r_c=5 pc. Stellar clusters in an initial orbit with semi-major axis \leq 250
pc may survive to dissolution but their orbits decay towards the center by
dynamical friction. In contrast, the stellar clumps can persist for a Hubble
time within a cored dark matter halo, even if the initial clump's radius is as
extended as r_c=80 pc. We also study the evolution of the clump in the MONDian
context. In this scenario, we find that even an extended stellar clump with
radius r_c=80 pc survives for a Hubble time, but an unrealistic value for the
stellar mass-to-light ratio of 9.2 is needed.


title:
Th\'eor\`eme ergodique pour cocycle harmonique, applications au milieu
  al\'eatoire. Ergodic theorem for harmonic cocycle, applications in random
  environment

abstract:
  In this work we prove the pointwise ergodic theorem for harmonic degree 1
cocycle of a measurable stationary action of Z^d on a probability space. In a
precedent paper Boivin and Derriennic (1991) studied this theorem for not
necessarily harmonic cocycles. The harmonic hypothesis allows, in the elliptic
case, to change the integrability condition to L^2, while Boivin and Derriennic
showed that the optimum condition in the non-harmonic case is the finiteness of
Lorentz's norm L_{d,1}. They showed in particular that L^d is not enough.
Berger and Biskup published in 2007 a paper on the harmonic not elliptic case,
but only in dimension d=2. Finally, applications of this theorem in random
media are presented.


title:
On Variant Strategies To Solve The Magnitude Least Squares Optimization
  Problem In Parallel Transmission Pulse Design And Under Strict SAR And Power
  Constraints

abstract:
  Parallel transmission has been a very promising candidate technology to
mitigate the inevitable radio-frequency field inhomogeneity in magnetic
resonance imaging (MRI) at ultra-high field (UHF). For the first few years,
pulse design utilizing this technique was expressed as a least squares problem
with crude power regularizations aimed at controlling the specific absorption
rate (SAR), hence the patient safety. This approach being suboptimal for many
applications sensitive mostly to the magnitude of the spin excitation, and not
its phase, the magnitude least squares (MLS) problem then was first formulated
in 2007. Despite its importance and the availability of other powerful
numerical optimization methods, this problem yet has been faced exclusively by
the pulse designer with the so-called variable exchange method. In this paper,
we investigate other strategies and incorporate directly the strict SAR and
hardware constraints. Different schemes such as sequential quadratic
programming (SQP), interior point (I-P) methods, semi-definite programming
(SDP) and magnitude squared least squares (MSLS) relaxations are studied both
in the small and large tip angle regimes with real data sets obtained in-vivo
on a human brain at 7 Tesla. Convergence and robustness of the different
approaches are analyzed, and recommendations to tackle this specific problem
are finally given. Small tip angle and inversion pulses are returned in a few
seconds and in under a minute respectively while respecting the constraints,
allowing the use of the proposed approach in routine.


title: Propagating Waves Transverse to the Magnetic Field in a Solar Prominence

abstract:
  We report an unusual set of observations of waves in a large prominence
pillar which consist of pulses propagating perpendicular to the prominence
magnetic field. We observe a huge quiescent prominence with the Solar Dynamics
Observatory (SDO) Atmospheric Imaging Assembly (AIA) in EUV on 2012 October 10
and only a part of it, the pillar, which is a foot or barb of the prominence,
with the Hinode Solar Optical Telescope (SOT) (in Ca II and H\alpha lines), Sac
Peak (in H\alpha, H\beta\ and Na-D lines), THEMIS ("T\'elescope
H\'eliographique pour l' Etude du Magn\'etisme et des Instabilit\'es Solaires")
with the MTR (MulTi-Raies) spectropolarimeter (in He D_3 line). The THEMIS/MTR
data indicates that the magnetic field in the pillar is essentially horizontal
and the observations in the optical domain show a large number of horizontally
aligned features on a much smaller scale than the pillar as a whole. The data
is consistent with a model of cool prominence plasma trapped in the dips of
horizontal field lines. The SOT and Sac Peak data over the 4 hour observing
period show vertical oscillations appearing as wave pulses. These pulses, which
include a Doppler signature, move vertically, perpendicular to the field
direction, along thin quasi-vertical columns in the much broader pillar. The
pulses have a velocity of propagation of about 10 km/s, a period about 300 sec,
and a wavelength around 2000 km. We interpret these waves in terms of fast
magneto-sonic waves and discuss possible wave drivers.


title:
A model for the self-organization of vesicular flux and protein
  distributions in the Golgi apparatus

abstract:
  The generation of two non-identical membrane compartments via exchange of
vesicles is considered to require two types of vesicles specified by distinct
cytosolic coats that selectively recruit cargo and two membrane-bound SNARE
pairs that specify fusion and differ in their affinities for each type of
vesicles. The mammalian Golgi complex is composed of 6-8 non-identical
cisternae that undergo gradual maturation and replacement yet features only two
SNARE pairs. We present a model that explains how the distinct composition of
Golgi cisternae can be generated with two and even a single SNARE pair and one
vesicle coat. A decay of active SNARE concentration in aging cisternae provides
the seed for a cis > trans SNARE gradient that generates the predominantly
retrograde vesicle flux which further enhances the gradient. This flux in turn
yields the observed inhomogeneous steady-state distribution of Golgi enzymes,
which compete with each other and with the SNAREs for incorporation into
transport vesicles. We show analytically that the steady state SNARE
concentration decays exponentially with the cisterna number. Numerical
solutions of rate equations reproduce the experimentally observed SNARE
gradients, overlapping enzyme peaks in cis, medial and trans and the reported
change in vesicle nature across Golgi: Vesicles originating from younger
cisternae mostly contain Golgi enzymes and SNAREs enriched in these cisternae
and extensively recycle through the Endoplasmic Reticulum (ER), while the other
subpopulation of vesicles contains Golgi proteins prevalent in older cisternae
and hardly reaches the ER.

categories: q-bio.SC nlin.AO physics.bio-ph q-bio.MN


title:
$H$-$T$ Phase Diagram of Multi-component Superconductors with Frustrated
  Inter-component Couplings

abstract:
  Multi-band superconductors in which frustrated inter-band couplings yield a
time-reversal-symmetry breaking (TRSB) state are investigated. Stability
condition for the TRSB state are derived based on the Bardeen-Cooper-Schrieffer
(BCS) theory. With the time-dependent Ginzburg-Landau (GL) method, vortex
states are investigated first at the vicinity of critical temperature
$T_\text{c}$ where the GL theory is valid, and the results are extended to
compose the $H$-$T$ phase diagram. When material parameters satisfy the
condition that the nucleation field is slightly larger than the thermodynamic
field ($H_\text{n} \gtrsim H_\text{tc}$) derived in a previous work (X. Hu and
Z. Wang, Phys. Rev. B 85, 064516 (2012)), an unconventional intermediate state
characterized by clustering vortices appears. Calculation of interface energy
reveals that the clustering vortices are associated with positive interface
energy.


title:
The Star Formation History of Redshift z~2 Galaxies: The Role of The
  Infrared Prior

abstract:
  We build a sample of 298 spectroscopically-confirmed galaxies at redshift
z~2, selected in the z-band from the GOODS-MUSIC catalog. By exploiting the
rest frame 8 um luminosity as a proxy of the star formation rate (SFR) we check
the accuracy of the standard SED-fitting technique, finding it is not accurate
enough to provide reliable estimates of the galaxy physical parameters. We then
develop a new SED-fitting method that includes the IR luminosity as a prior and
a generalized Calzetti law with a variable RV . Then we exploit such a new
method to re-analyze our galaxy sample, and to robustly determine SFRs, stellar
masses and ages. We find that there is a general trend of increasing
attenuation with the SFR. Moreover, we find that the SFRs range between a few
to 1000 solar mass per year, the masses from one billion to 400 billion solar
masses, while the ages from a few tens of Myr to more than 1 Gyr. We discuss
how individual age easurements of highly attenuated objects indicate that dust
must form within a few tens of Myr and be copious already at ~100 Myr. In
addition, we find that low luminous galaxies harbor, on average, significantly
older stellar populations and are also less massive than brighter ones; we
discuss how these findings and the well known 'downsizing' scenario are
consistent in a framework where less massive galaxies form first, but their
star formation lasts longer. Finally, we find that the near-IR attenuation is
not scarce for luminous objects, contrary to what is customarily assumed; we
discuss how this affects the interpretation of the observed mass-to-light
ratios.


title:
Symmetry energy from the nuclear collective motion: constraints from
  dipole, quadrupole, monopole and spin-dipole resonances

abstract:
  The experimental and theoretical studies of Giant Resonances, or more
generally of the nuclear collective vibrations, are a well established domain
in which sophisticated techniques have been introduced and firm conclusions
reached after an effort of several decades. From it, information on the nuclear
equation of state can be extracted, albeit not far from usual nuclear
densities. In this contribution, which complements other contributions
appearing in the current volume, we survey some of the constraints that have
been extracted recently concerning the parameters of the nuclear symmetry
energy. Isovector modes, in which neutrons and protons are in opposite phase,
are a natural source of information and we illustrate the values of symmetry
energy around saturation deduced from isovector dipole and isovector quadrupole
states. The isotopic dependence of the isoscalar monopole energy has also been
suggested to provide a connection to the symmetry energy: relevant theoretical
arguments and experimental results are thoroughly discussed. Finally, we
consider the case of the charge-exchange spin-dipole excitations in which the
sum rule associated with the total strength gives in principle access to the
neutron skin and thus, indirectly, to the symmetry energy.


title: Charm mass effects in bulk channel correlations

abstract:
  The bulk viscosity of thermalized QCD matter at temperatures above a few
hundred MeV could be significantly influenced by charm quarks because their
contribution arises four perturbative orders before purely gluonic effects. In
an attempt to clarify the challenges of a lattice study, we determine the
relevant imaginary-time correlator (of massive scalar densities) up to NLO in
perturbation theory, and compare with existing data. We find discrepancies much
larger than in the vector channel; this may hint, apart from the importance of
taking a continuum limit, to larger non-perturbative effects in the scalar
channel. We also recall how a transport peak related to the scalar density
spectral function encodes non-perturbative information concerning the charm
quark chemical equilibration rate close to equilibrium.


title:
Identification of nonlinear controllers from data: theory and
  computation

abstract:
  This manuscript contains technical details and proofs of recent results
developed by the authors, pertaining to the design of nonlinear controllers
from the experimental data measured on an existing feedback control system.


title: Lukasiewicz logic and Riesz spaces

abstract:
  We initiate a deep study of {\em Riesz MV-algebras} which are MV-algebras
endowed with a scalar multiplication with scalars from $[0,1]$. Extending
Mundici's equivalence between MV-algebras and $\ell$-groups, we prove that
Riesz MV-algebras are categorically equivalent with unit intervals in Riesz
spaces with strong unit. Moreover, the subclass of norm-complete Riesz
MV-algebras is equivalent with the class of commutative unital C$^*$-algebras.
The propositional calculus ${\mathbb R}{\cal L}$ that has Riesz MV-algebras as
models is a conservative extension of \L ukasiewicz $\infty$-valued
propositional calculus and it is complete with respect to evaluations in the
standard model $[0,1]$. We prove a normal form theorem for this logic,
extending McNaughton theorem for \L ukasiewicz logic. We define the notions of
quasi-linear combination and quasi-linear span for formulas in ${\mathbb
R}{\cal L}$ and we relate them with the analogue of de Finetti's coherence
criterion for ${\mathbb R}{\cal L}$.


title:
Simple Piecewise Geodesic Interpolation of Simple and Jordan Curves with
  Applications

abstract:
  We explicitly construct simple, piecewise minimizing geodesic, arbitrarily
fine interpolation of simple and Jordan curves on a Riemannian manifold. In
particular, a finite sequence of partition points can be specified in advance
to be included in our construction. Then we present two applications of our
main results: the generalized Green's theorem and the uniqueness of signature
for planar Jordan curves with finite p-variation for 1<=p<2.


title: Inverse Smith-Purcell effect near rough surfaces

abstract:
  Absorption of a photon by an electron moving parallel to a rough surface is
studied.In the weak scattering regime we have evaluated the absorption
probability of absorption of a single photon. It is shown the absorption
probability with diffusional contribution becomes large by a lin/l factor
compared to the analogous result with the single scattering contribution. The
maximum of probability takes place for the infrared wavelengths and strongly
depends on the particle energy. We also discuss the case of two-dimensional
periodical surface profile and indicate optimal conditions for maximal
absorption probability. The results can be used in electron energy gain
spectroscopy and in laser-driven acceleration.


title: Almost Sure Local Limit Theorem for the Dickman distribution

abstract:
  In this paper we present a new correlation inequality and use it for proving
an Almost Sure Local Limit Theorem for the so-called Dickman distribution.
Several related results are also proved


title: Bispectrum from open inflation

abstract:
  We calculate the bispectrum of primordial curvature perturbations, \zeta,
generated during "open inflation." Inflation occurs inside a bubble nucleated
via quantum tunneling from the background false vacuum state. Our universe
lives inside the bubble, which can be described as a
Friedman-Lema\^itre-Robertson-Walker (FLRW) universe with negative spatial
curvature, undergoing slow-roll inflation. We pay special attention to the
issue of an initial state for quantum fluctuations. A "vacuum state" defined by
a positive-frequency mode in de Sitter space charted by open coordinates is
different from the Euclidean vacuum (which is equivalent to the so-called
"Bunch-Davies vacuum"). Quantum tunneling then modifies the initial state away
from the original Euclidean vacuum. While most of the previous study on
modifications of the initial quantum state introduces, by hand, an initial time
at which the quantum state is modified as well as the form of the modification,
an effective initial time naturally emerges and the form is fixed by quantum
tunneling in open inflation models. Therefore, open inflation enables a
self-consistent computation of the effect of a modified initial state on the
bispectrum. We find a term which goes as <\zeta_{k_1} \zeta_{k_2} \zeta_{k_3}>
\propto 1/k_1^2k_3^4 in the so-called squeezed configurations, k_3\ll
k_1\approx k_2, in agreement with the previous study. The bispectrum in the
exact folded limit, e.g., k_1=k_2+k_3, is also enhanced and remains finite.
However, these terms are exponentially suppressed when the wavelength of \zeta
is smaller than the curvature radius of the universe. The leading-order
bispectrum is equal to the usual one from single-field slow-roll inflation; the
terms specific for open inflation arise only in the sub-leading order when the
wavelength of \zeta is smaller than the curvature radius.


title:
Coexistence of diffusive resistance and ballistic persistent current in
  disordered metallic rings with rough edges: Possible origin of puzzling
  experimental values

abstract:
  Typical persistent current ($I_{typ}$) in a mesoscopic normal metal ring with
disorder due to rough edges and random grain boundaries is calculated by a
scattering matrix method. In addition, resistance of a corresponding metallic
wire is obtained from the Landauer formula and the electron mean free path
($l$) is determined. If disorder is due to the rough edges, a ballistic
persistent current $I_{typ} \simeq e v_F/L$ is found to coexist with the
diffusive resistance ($ \propto L/l$), where $v_F$ is the Fermi velocity and $L
\gg l$ is the ring length. This ballistic current is due to a single electron
that moves almost in parallel with the rough edges and thus hits them rarely
(it is shown that this parallel motion exists in the ring geometry owing to the
Hartree-Fock interaction). Our finding agrees with a puzzling experimental
result $I_{typ}\simeq e v_F/L$, reported by Chandrasekhar et al. [Phys. Rev.
Lett. \textbf{67}, 3578 (1991)] for metallic rings of length $L \simeq 100 l$.
If disorder is due to the grain boundaries, our data reproduce theoretical
result $I_{typ}\simeq (e v_F/L) (l/L)$ that holds for the white-noise-like
disorder and has been observed in recent experiments. Thus, result
$I_{typ}\simeq e v_F/L$ in a disordered metallic ring of length $L \gg l$ is as
normal as result $I_{typ}\simeq (e v_F/L)(l/L)$. Which result is observed
depends on the nature of disorder. Experiments that would determine $I_{typ}$
and $l$ in correlation with the nature of disorder can be instructive.


title: One-loop correction to the energy of a wavy line string in AdS_5

abstract:
  We consider a computation of one-loop AdS_5 x S^5 superstring correction to
the energy radiated by the end-point of a string which moves along a wavy line
at the boundary of AdS_5 with a small transverse acceleration (the
corresponding classical solution was described by Mikhailov in hep-th/0305196).
We also compute the one-loop effective action for an arbitrary small transverse
string fluctuation background. It is related by an analytic continuation to the
Euclidean effective action describing one-loop correction to the expectation
value of a wavy Wilson line. We show that both the one-loop contribution to the
energy and to the Wilson line are controlled by the subleading term in the
strong-coupling expansion of the function B(\lambda) as suggested by Correa,
Henn, Maldacena and Sever in arXiv:1202.4455.


title:
About Brezis-Merle Problem with holderian condition: the case of three
  blow-up points

abstract:
  We give a compactness result for the Brezis-Merle problem with holderian
condition. We look to the case of three blow-up points.


title:
Irreducible characters of Sylow p-subgroups of the Steinberg triality
  groups $^3D_4(p^{3m})$

abstract:
  In this notes we construct and count all ordinary irreducible characters of
Sylow $p$-subgroups of the Steinberg triality groups ${}^3D_4(p^{3m})$.


title: Galactic Evolved Massive Stars Discovered by Their Infrared Emission

abstract:
  Determining the Galactic distribution and numbers of massive stars, such as
Wolf-Rayet stars (WRs), is hampered by intervening Galactic or local
circumstellar dust obscuration. In order to probe such regions of the Galaxy we
can use infrared observations, which provide a means for finding such hidden
populations through the dust. The availability of both 2MASS and
Spitzer/GLIMPSE large-scale survey data provides infrared colours from 1.25 to
8$\mu$m for a large fraction of the inner Galactic plane. In 2005 we initiated
a pilot study of the combined set of infrared colours for two GLIMPSE fields
and showed that WRs typically occupy a sparsely populated region of the colour
space. We followed up 42 of our WR candidates spectroscopically in the
near-infrared, and with limited additional observations of some of these
candidates in the optical. Six new WRs, four late-type WN and two late-type WC
stars, were discovered as a result. Of the remaining $\sim$86% of the sample,
five appear to be O-type stars. 21 stars are likely of type Be, and 10 stars
appear to be of late-type, or possibly young stellar objects, which have
"contaminated" the infrared color space. The survey is generally unbiased
towards clusters or field stars, and the new WRs found are in both the field
and in and around the RCW 49 region (including cluster Westerlund 2). In this
work, and in our other recent work, we show that the infrared broad-band
colours to be the most efficient means of identifying (particularly,
dust-obscured) candidate massive stars, notably WRs.


title: Network-Level Cooperation in Energy Harvesting Wireless Networks

abstract:
  We consider a two-hop communication network consisted of a source node, a
relay and a destination node in which the source and the relay node have
external traffic arrivals. The relay forwards a fraction of the source node's
traffic to the destination and the cooperation is performed at the network
level. In addition, both source and relay nodes have energy harvesting
capabilities and an unlimited battery to store the harvested energy. We study
the impact of the energy constraints on the stability region. Specifically, we
provide inner and outer bounds on the stability region of the two-hop network
with energy harvesting source and relay.


title: Stuck walks: A conjecture of Erschler, T\'oth and Werner

abstract:
  In this paper, we work on a class of self-interacting nearest neighbor random
walks, introduced in [Probab. Theory Related Fields 154 (2012) 149-163], for
which there is competition between repulsion of neighboring edges and
attraction of next-to-neighboring edges. Erschler, T\'{o}th and Werner proved
in [Probab. Theory Related Fields 154 (2012) 149-163] that, for any $L\ge1$, if
the parameter $\alpha$ belongs to a certain interval $(\alpha_{L+1},\alpha_L)$,
then such random walks localize on $L+2$ sites with positive probability. They
also conjectured that this is the almost sure behavior. We prove this
conjecture partially, stating that the walk localizes on $L+2$ or $L+3$ sites
almost surely, under the same assumptions. We also prove that, if
$\alpha\in(1,+\infty)=(\alpha_2,\alpha_1)$, then the walk localizes a.s. on $3$
sites.


title:
Intermittent dynamics and logarithmic domain growth during the spinodal
  decomposition of a glass-forming liquid

abstract:
  We use large-scale molecular dynamics simulations of a simple glass-forming
system to investigate how its liquid-gas phase separation kinetics depends on
temperature. A shallow quench leads to a fully demixed liquid-gas system
whereas a deep quench makes the dense phase undergo a glass transition and
become an amorphous solid. This glass has a gel-like bicontinuous structure
that evolves very slowly with time and becomes fully arrested in the limit
where thermal fluctuations become negligible. We show that the phase separation
kinetics changes qualitatively with temperature, the microscopic dynamics
evolving from a surface tension-driven diffusive motion at high temperature to
a strongly intermittent, heterogeneous and thermally activated dynamics at low
temperature, with a logarithmically slow growth of the typical domain size.
These results shed light on recent experimental observations of various porous
materials produced by arrested spinodal decomposition, such as nonequilibrium
colloidal gels and bicontinuous polymeric structures, and they elucidate the
microscopic mechanisms underlying a specific class of viscoelastic phase
separation.


title: A "Piano Movers" Problem Reformulated

abstract:
  It has long been known that cylindrical algebraic decompositions (CADs) can
in theory be used for robot motion planning. However, in practice even the
simplest examples can be too complicated to tackle. We consider in detail a
"Piano Mover's Problem" which considers moving an infinitesimally thin piano
(or ladder) through a right-angled corridor.
  Producing a CAD for the original formulation of this problem is still
infeasible after 25 years of improvements in both CAD theory and computer
hardware. We review some alternative formulations in the literature which use
differing levels of geometric analysis before input to a CAD algorithm. Simpler
formulations allow CAD to easily address the question of the existence of a
path. We provide a new formulation for which both a CAD can be constructed and
from which an actual path could be determined if one exists, and analyse the
CADs produced using this approach for variations of the problem.
  This emphasises the importance of the precise formulation of such problems
for CAD. We analyse the formulations and their CADs considering a variety of
heuristics and general criteria, leading to conclusions about tackling other
problems of this form.


title:
Interplay of force constants in the lattice dynamics of disordered
  alloys : An ab-initio study

abstract:
  A reliable prediction of interatomic force constants in disordered alloys is
an outstanding problem. This is due to the need for a proper treatment of
multisite (atleast pair) correlation within a random environment. The situation
becomes even more challenging for systems with large difference in atomic size
and mass. We propose a systematic density functional theory (DFT) based study
to predict the ab-initio force constants in random alloys. The method is based
on a marriage between special quasirandom structures (SQS) and the augmented
space recursion (ASR) to calculate phonon spectra, density of states (DOS) etc.
bcc TaW and fcc NiPt alloys are considered as the two distinct test cases.
Ta-Ta (W-W) bond distance in the alloy is predicted to be smaller (larger) than
those in pure Ta (W), which, in turn, yields stiffer (softer) force constants
for Ta (W). Pt-Pt force constants in the alloy, however, are predicted to be
softer compared to Ni-Ni, due to a large bond distance of the former. Our
calculated force constants, phonon spectra and DOS are compared with
experiments and other theoretical results, wherever available. Correct trend of
present results for the two alloys pave a path for further future studies in
more complex alloy systems.


title: Isospin transport in 84Kr+112,124Sn reactions at Fermi energies

abstract:
  Isospin transport phenomena in dissipative heavy ion collisions have been
investigated at Fermi energies with a beam of 84Kr at 35AMeV. A comparison of
the <N>/Z of light and medium products forward-emitted in the centre of mass
frame when the beam impinges on a n-poor 112Sn and a n-rich 124Sn targets is
presented. Data were collected by means of a three-layer telescope with very
good performances in terms of mass identification (full isotopic resolution up
to Z about 20 for ions punching through the first detector layer) built by the
FAZIA Collaboration and located just beyond the grazing angle for both
reactions. The <N>/Z of the decay products emitted when the n-rich target is
used is always higher than that associated to the n-poor one. Since the
detector was able to measure only fragments coming from the QuasiProjectile
decay and/or neck emission, the observed behaviour can be ascribed to the
isospin diffusion, driven by the isospin gradient between QuasiProjectile and
QuasiTarget. Moreover, for light fragments the <N>/Z as a function of the lab
velocity of the fragment increases when we move from the QuasiProjectile
velocity to the centre of mass (neck zone). This effect can be interpreted as
an evidence of isospin drift driven by the density gradient between the
QuasiProjectile zone (at normal density) and the more diluted neck zone.


title:
Seeking Observable Imprints of Small-Scale Structure on the Properties
  of Dark Matter Haloes

abstract:
  The characteristic prediction of the Cold Dark Matter (CDM) model of
cosmological structure formation is that the Universe should contain a wealth
of small-scale structure -- low-mass dark matter haloes and subhaloes. However,
galaxy formation is inefficient in their shallow potential wells and so we
expect these low-mass haloes and subhaloes to be dark. Can we tell the
difference between a Universe in which low-mass haloes are present but dark and
one in which they never formed, thereby providing a robust test of the CDM
model? We address this question using cosmological simulations to examine how
properties of low-mass haloes that are potentially accessible to observation,
such as their spatial clustering, rate of accretions and mergers onto massive
galaxies and the angular momentum content of massive galaxies, differ between a
LCDM model and dark matter models in which low-mass halo formation is
suppressed. Adopting an effective cut-off mass scale M_cut below which
small-scale power is suppressed in the initial conditions, we study dark matter
models in which M_cut varies between 5e9 Msol/h and 1e11 Msol/h, equivalent to
the host haloes of dwarf and low mass galaxies. Our results show that both the
clustering strength of low-mass haloes around galaxy-mass primaries and the
rate at which they merge with these primaries is sensitive to the assumed value
of M_cut; in contrast, suppressing low-mass halo formation has little influence
on the angular momentum content of galaxy-mass haloes -- it is the quiescence
or violence of a halo's assembly history that has a more marked effect.
However, we expect that measuring the effect on spatial clustering or the
merger rate is likely to be observationally difficult for realistic values of
M_cut, and so isolating the effect of this small-scale structure would appear
to be remarkably difficult to detect, at least in the present day Universe.


title: Symmetry energy, unstable nuclei, and neutron star crusts

abstract:
  Phenomenological approach to inhomogeneous nuclear matter is useful to
describe fundamental properties of atomic nuclei and neutron star crusts in
terms of the equation of state of uniform nuclear matter. We review a series of
researches that we have developed by following this approach. We start with
more than 200 equations of state that are consistent with empirical masses and
charge radii of stable nuclei and then apply them to describe matter radii and
masses of unstable nuclei, proton elastic scattering and total reaction cross
sections off unstable nuclei, and nuclei in neutron star crusts including
nuclear pasta. We finally discuss the possibility of constraining the density
dependence of the symmetry energy from experiments on unstable nuclei and even
observations of quasi-periodic oscillations in giant flares of soft gamma-ray
repeaters.


title:
CLASH-VLT: spectroscopic confirmation of a z=6.11 quintuply lensed
  galaxy in the Frontier Fields Cluster RXC J2248.7-4431

abstract:
  We present VIsible Multi-Object Spectrograph (VIMOS) observations of a z 6
galaxy quintuply imaged by the Frontier Fields galaxy cluster RXC J2248.7-4431
(z=0.348). This sub-L^*, high-z galaxy has been recently discovered by Monna et
al. (2013) using dropout techniques with the 16-band HST photometry acquired as
part of the Cluster Lensing And Supernova survey with Hubble (CLASH). Obtained
as part of the CLASH-VLT survey, the VIMOS medium-resolution spectra of this
source show a very faint continuum between ~8700A and ~9300A and a prominent
emission line at 8643A, which can be readily identified with Lyman-alpha at
z=6.110. The emission line exhibits an asymmetric profile, with a more
pronounced red wing. The rest-frame equivalent width of the line is EW=79+-10A.
After correcting for magnification, the star-formation rate (SFR) estimated
from the Lya line is SFR(Lya)=11 M_{sol}/yr and that estimated from the UV data
is SFR(UV)=3 M_{sol}/yr. We estimate that the effective radius of the source is
R_e<~0.4 kpc, which implies a star formation surface mass density Sigma_{SFR}>6
M_{sol}/yr/kpc^2 and, using the Kennicutt-Schmidt relation, a gas surface mass
density Sigma_{gas}>10^3 M_{sol}/pc^2. Our results support the idea that this
magnified, distant galaxy is a young and compact object with 0.4 L^* at z=6,
with comparable amount of mass in gas and stars. Future follow-up observations
with ALMA will provide valuable insight into the SFR and molecular gas content
of this source. In the spirit of the Frontier Fields initiative, we also
publish the redshifts of several multiply imaged sources and other background
objects which will help improving the strong lensing model of this galaxy
cluster.


title:
A study of the apsidal angle and a proof of monotonicity in the
  logarithmic potential case

abstract:
  This paper concerns the behaviour of the apsidal angle for orbits of central
force system with homogenous potential of degree $-2\leq \alpha\leq 1$ and
logarithmic potential. We derive a formula for the apsidal angle as a fixed-end
points integral and we study the derivative of the apsidal angle with respect
to the angular momentum $\ell$. The monotonicity of the apsidal angle as
function of $\ell$ is discussed and it is proved in the logarithmic potential
case.


title: Graphene/liquid crystal based terahertz phase shifters

abstract:
  Due to its high electrical conductivity and excellent transmittance at
terahertz frequencies, graphene is a promising candidate as transparent
electrodes for terahertz devices. We demonstrate a liquid crystal based
terahertz phase shifter with the graphene films as transparent electrodes. The
maximum phase shift is 10.8 degree and the saturation voltage is 5 V with a 50
um liquid crystal cell. The transmittance at terahertz frequencies and
electrical conductivity depending on the number of graphene layer are also
investigated. The proposed phase shifter provides a continuous tunability,
fully electrical controllability, and low DC voltage operation.


title:
Security analysis of epsilon-almost dual universal2 hash functions:
  smoothing of min entropy vs. smoothing of R\'enyi entropy of order 2

abstract:
  Recently, $\varepsilon$-almost dual universal$_2$ hash functions has been
proposed as a new and wider class of hash functions. Using this class of hash
functions, several efficient hash functions were proposed. This paper evaluates
the security performance when we apply this kind of hash functions. We evaluate
the security in several kinds of setting based on the $L_1$ distinguishability
criterion and the modified mutual information criterion. The obtained
evaluation is based on smoothing of R\'{e}nyi entropy of order 2 and/or min
entropy. We clarify the difference between these two methods.


title: KdV equation under periodic boundary conditions and its perturbations

abstract:
  In this paper we discuss properties of the KdV equation under periodic
boundary conditions, especially those which are important to study
perturbations of the equation. Next we review what is known now about long-time
behaviour of solutions for perturbed KdV equations.


title: 2D fuzzy Anti-de Sitter space from matrix models

abstract:
  We study the fuzzy hyperboloids AdS^2 and dS^2 as brane solutions in matrix
models. The unitary representations of SO(2,1) required for quantum field
theory are identified, and explicit formulae for their realization in terms of
fuzzy wavefunctions are given. In a second part, we study the (A)dS^2 brane
geometry and its dynamics, as governed by a suitable matrix model. In
particular, we show that trace of the energy-momentum tensor of matter induces
transversal perturbations of the brane and of the Ricci scalar. This leads to a
linearized form of Henneaux-Teitelboim-type gravity, illustrating the mechanism
of emergent gravity in matrix models.


title:
Phase Transition in 3d Heisenberg Spin Glasses with Strong Random
  Anisotropies, through a Multi-GPU Parallelization

abstract:
  We characterize the phase diagram of anisotropic Heisenberg spin glasses,
finding both the spin and the chiral glass transition. We remark the presence
of strong finite-size effects on the chiral sector. We find a unique phase
transition for the chiral and spin glass sector, in the Universality class of
Ising spin glasses. We focus on keeping finite-size effects under control, and
we stress that they are important to understand experiments. Thanks to large
GPU clusters we have been able to thermalize cubic lattices with up to 64x64x64
spins, over a vast range of temperatures.


title: Local deformation rings and a Breuil-M\'{e}zard conjecture when l\neq p

abstract:
  We compute the deformation rings of two dimensional mod l representations of
Gal(Fbar/F) with fixed inertial type, for l an odd prime, p a prime distinct
from p and F/Q_p a finite extension. We show that in this setting (when p is
also odd) an analogue of the Breuil-M\'{e}zard conjecture holds, relating the
special fibres of these deformation rings to the mod l reduction of certain
irreducible representations of GL_2(O_F).


title: Biharmonic submanifolds into ellipsoids

abstract:
  In this paper we construct proper biharmonic submanifolds into various types
of ellipsoids. We also prove, in this context, some useful composition
properties which can be used to produce large families of new proper biharmonic
immersions.


title:
Global estimation of child mortality using a Bayesian B-spline
  Bias-reduction model

abstract:
  Estimates of the under-five mortality rate (U5MR) are used to track progress
in reducing child mortality and to evaluate countries' performance related to
Millennium Development Goal 4. However, for the great majority of developing
countries without well-functioning vital registration systems, estimating the
U5MR is challenging due to limited data availability and data quality issues.
We describe a Bayesian penalized B-spline regression model for assessing levels
and trends in the U5MR for all countries in the world, whereby biases in data
series are estimated through the inclusion of a multilevel model to improve
upon the limitations of current methods. B-spline smoothing parameters are also
estimated through a multilevel model. Improved spline extrapolations are
obtained through logarithmic pooling of the posterior predictive distribution
of country-specific changes in spline coefficients with observed changes on the
global level. The proposed model is able to flexibly capture changes in U5MR
over time, gives point estimates and credible intervals reflecting potential
biases in data series and performs reasonably well in out-of-sample validation
exercises. It has been accepted by the United Nations Inter-agency Group for
Child Mortality Estimation to generate estimates for all member countries.


title: Gas accretion in disk galaxies

abstract:
  Gas accretion is necessary to maintain star formation, spiral and bar
structure, and secular evolution in galaxies. This can occur through tidal
interaction, or mass accretion from cosmic filaments. Different processes will
be reviewed to drive gas towards galaxy centers and trigger starbursts and AGN.
The efficiency of these dynamical processes can be estimated through
simulations and checked by observations at different redshift, across the
Hubble time. Large progress has been made on galaxies at moderate and high
redshifts, allowing to interpret the star formation history and star formation
efficiency as a function of gas content, dynamical state and galaxy evolution.


title: Sunspot Group Development in High Resolution

abstract:
  The Solar and Heliospheric Obseratory/Michelson Doppler Imager--Debrecen Data
(SDD) sunspot catalogue provides an opportunity to study the details and
development of sunspot groups on a large statistical sample. The SDD data
allow, in particular, the differential study of the leading and following parts
with a temporal resolution of 1.5 hours. In this study, we analyse the
equilibrium distance of sunspot groups as well as the evolution of this
distance over the lifetime of the groups and the shifts in longitude associated
with these groups. We also study the asymmetry between the compactness of the
leading and following parts, as well as the time-profiles for the development
of the area of sunspot groups. A logarithmic relationship has been found
between the total area and the distance of leading-following parts of active
regions (ARs) at the time of their maximum area. In the developing phase the
leading part moves forward; this is more noticeable in larger ARs. The leading
part has a higher growth rate than the trailing part in most cases in the
developing phase. The growth rates of the sunspot groups depend linearly on
their maximum total umbral area. There is an asymmetry in compactness: the
number of spots tends to be smaller, while their mean area is larger in the
leading part at the maximum phase.


title:
Dumbbells in suspension: A numerical study on their dynamics and shear
  viscosity

abstract:
  The dynamics of elastic dumbbells in linear shear flow is investigated by
fluid particle dynamics simulations at small Reynolds numbers. The positive
contribution of a single dumbbell to the effective shear viscosity is
determined via the extra stress exerted at the boundaries of the shear cell and
the difference to the contributions obtained via the Kramers-Kirkwood formula
are described. For a small Weissenberg number and when the mean dumbbell length
becomes larger than the mean next-neighbor distance, the contribution of
interacting dumbbells to the mean shear viscosity exceeds significantly the
contribution of unconnected beads occupying the same volume fraction.


title:
Measuring the Kerr spin parameter of regular black holes from their
  shadow

abstract:
  In a previous paper, one of us has showed that, at least in some cases, the
Kerr-nature of astrophysical black hole candidates is extremely difficult to
test and current techniques, even in presence of excellent data not available
today, cannot distinguish a Kerr black hole from a Bardeen one, despite the
substantial difference of the two backgrounds. In this paper, we investigate if
the detection of the "shadow" of nearby super-massive black hole candidates by
near future mm/sub-mm very long baseline interferometry experiments can do the
job. More specifically, we consider the measurement of the Kerr spin parameter
of the Bardeen and Hayward regular black holes from their shadow, and we then
compare the result with the estimate inferred from the K$\alpha$ iron line and
from the frequency of the innermost stable circular orbit. For non-rotating
black holes, the shadow approach provides different values, and therefore the
Kerr black hole hypothesis can potentially be tested. For near extremal
objects, all the approaches give quite similar results, and therefore it is not
possible to constrain deviations from the Kerr solution. The present work
confirms that it is definitively challenging to test this kind of metrics, even
with future facilities. However, the detection of a source that looks like a
fast-rotating Kerr black hole can put meaningful constraints on the nature of
the compact object.


title: The Physics of Traffic and Regional Development

abstract:
  This contribution summarizes and explains various principles from physics
which are used for the simulation of traffic flows in large street networks,
the modeling of destination, transport mode, and route choice, or the
simulation of urban growth and regional development. The methods stem from
many-particle physics, from kinetic gas theory, or fluiddynamics. They involve
energy and entropy considerations, transfer the law of gravity, apply cellular
automata and require methods from evolutionary game theory. In this way, one
can determine interaction forces among driver-vehicle units, reproduce
breakdowns of traffic including features of synchronized congested flow, or
understand changing usage patterns of alternative roads. One can also describe
daily activity patterns based on decision models, simulate migration streams,
and model urban growth as a particular kind of aggregation process.


title: Particles with non abelian charges

abstract:
  Efficient methods for describing non abelian charges in worldline approaches
to QFT are useful to simplify calculations and address structural properties,
as for example color/kinematics relations. Here we analyze in detail a method
for treating arbitrary non abelian charges. We use Grassmann variables to take
into account color degrees of freedom, which however are known to produce
reducible representations of the color group. Then we couple them to a U(1)
gauge field defined on the worldline, together with a Chern-Simons term, to
achieve projection on an irreducible representation. Upon gauge fixing there
remains a modulus, an angle parametrizing the U(1) Wilson loop, whose
dependence is taken into account exactly in the propagator of the Grassmann
variables. We test the method in simple examples, the scalar and spin 1/2
contribution to the gluon self energy, and suggest that it might simplify the
analysis of more involved amplitudes.


title: Pedestrian, Crowd, and Evacuation Dynamics

abstract:
  This contribution describes efforts to model the behavior of individual
pedestrians and their interactions in crowds, which generate certain kinds of
self-organized patterns of motion. Moreover, this article focusses on the
dynamics of crowds in panic or evacuation situations, methods to optimize
building designs for egress, and factors potentially causing the breakdown of
orderly motion.


title:
A General Framework for Nonlinear Model Predictive Control with Abstract
  Updates

abstract:
  Considering nonlinear processes which are subject to unknown but measurable
disturbances, we provide both stability and feasibility proofs for nonlinear
model predictive controllers with abstract updates without the use of
stabilizing terminal constraints or cost. The result utilizes a relaxed
Lyapunov inequality for the nominal system and reasonable affine Lipschitz
conditions on the open loop change of the optimal value function and the stage
costs. For this methodology, we provide proofs that the known MPC updating
techniques based on sensitivities, realtime iterations and hierachically
structured MPC updates satisfy our assumptions revealing a common stability
framework. To illustrate our approach we present a quartercar example and show
performance improvements of the updated solution with respect to comfort and
handling properties.


title:
Second comment on "Dense and nanometric electronic excitations induced
  by swift heavy ions in an ionic CaF2 crystal: Evidence for two thresholds of
  damage creation"

abstract:
  Controversy over nature and existence of the velocity effect [G. Szenes,
Phys. Rev. B 87, 056101 (2013)], [M. Toulemonde et al., Phys. Rev. B 87, 056102
(2013)] reignited after new experimental data on swift heavy ion tracks in CaF2
was reported recently [M. Toulemonde et al., Phys. Rev. B 85, 054112 (2012)].
Here we show that results of the analysis in ref. [G. Szenes, Phys. Rev. B 87,
056101 (2013)] should be interpreted differently within analytical thermal
spike model. We also propose explanation for apparently missing velocity
effect.


title:
Study of resonant inelastic light scattering in Keldysh-Schwinger
  functional integral formalism

abstract:
  The scattering cross section of the resonant inelastic light scattering is
represented as a correlation function in the Keldysh-Schwinger functional
integral formalism. The functional integral approach enables us to compute the
cross section in the Feynman diagram perturbation theory where many-body
effects can be fully incorporated. This approach is applied to the one G-phonon
Raman scattering of graphene, and the result is shown to agree with the one
previously obtained by the conventional Fermi golden rule formula. Also, this
approach is generalized to the systems in non-equilibrium conditions.


title:
An Aggregation Technique For Large-Scale PEPA Models With Non-Uniform
  Populations

abstract:
  Performance analysis based on modelling consists of two major steps: model
construction and model analysis. Formal modelling techniques significantly aid
model construction but can exacerbate model analysis. In particular, here we
consider the analysis of large-scale systems which consist of one or more
entities replicated many times to form large populations. The replication of
entities in such models can cause their state spaces to grow exponentially to
the extent that their exact stochastic analysis becomes computationally
expensive or even infeasible.
  In this paper, we propose a new approximate aggregation algorithm for a class
of large-scale PEPA models. For a given model, the method quickly checks if it
satisfies a syntactic condition, indicating that the model may be solved
approximately with high accuracy. If so, an aggregated CTMC is generated
directly from the model description. This CTMC can be used for efficient
derivation of an approximate marginal probability distribution over some of the
model's populations. In the context of a large-scale client-server system, we
demonstrate the usefulness of our method.


title:
Infrared conformality and bulk critical points: SU(2) with heavy adjoint
  quarks

abstract:
  The lattice phase structure of a gauge theory can be a serious obstruction to
Monte Carlo studies of its continuum behaviour. This issue is particularly
delicate when numerical studies are performed to determine whether a theory is
in a (near-)conformal phase. In this work we investigate the heavy mass limit
of the SU(2) gauge theory with Nf=2 adjoint fermions and its lattice phase
diagram, showing the presence of a critical point ending a line of first order
bulk phase transition. The relevant gauge observables and the low-lying
spectrum are monitored in the vicinity of the critical point with very good
control over different systematic effects. The scaling properties of masses and
susceptibilities open the possibility that the effective theory at criticality
is a scalar theory in the universality class of the four-dimensional Gaussian
model. This behaviour is clearly different from what is observed for SU(2)
gauge theory with two dynamical adjoint fermions, whose (near-)conformal
numerical signature is hence free from strong-coupling bulk effects.


title:
Influence of homo-buffer layer on stress control of sputtered
  (Ba0.45,Sr0.55)TiO3 thin films on Pt-Si

abstract:
  To engineer strain relaxation of sputtered BST thin films on Pt-Si wafers,
homo-buffer layer method was applied to eliminate Pt hillock formation. Thin
BST homo-buffer layers were deposited at room temperature and subsequently the
main BST layer was deposited at 650{\deg}C, Pt hillock free BST films were
obtained with homo-buffer thickness above 5 nm. Relatively good electrical
properties were obtained for BST thin films with 15 and 25 nm homo-buffer layer
(T= 30 % at 5V and tan {\delta}= 0.018).


title:
On Jaeger's HOMFLY-PT expansions, branching rules and link homology: a
  progress report

abstract:
  This note is a write-up of a talk given by the author at the Meeting of the
Sociedade Portuguesa de Matematica in July 2012. We describe Jaeger's HOMFLY-PT
expansion of the Kauffman polynomial and how to generalize it to other quantum
invariants using the so-called "branching rules" for Lie algebra
representations. We present a program which aims to construct Jaeger expansions
for link homology theories.


title:
To be or not to be intrusive? The solution of parametric and stochastic
  equations - the "plain vanilla" Galerkin case

abstract:
  In parametric equations - stochastic equations are a special case - one may
want to approximate the solution such that it is easy to evaluate its
dependence of the parameters. Interpolation in the parameters is an obvious
possibility, in this context often labeled as a collocation method. In the
frequent situation where one has a "solver" for the equation for a given
parameter value - this may be a software component or a program - it is evident
that this can independently solve for the parameter values to be interpolated.
Such uncoupled methods which allow the use of the original solver are classed
as "non-intrusive". By extension, all other methods which produce some kind of
coupled system are often - in our view prematurely - classed as "intrusive". We
show for simple Galerkin formulations of the parametric problem - which
generally produce coupled systems - how one may compute the approximation in a
non-intusive way.


title:
Detection of $^{133}$Xe from the Fukushima nuclear power plant in the
  upper troposphere above Germany

abstract:
  After the accident in the Japanese Fukushima Dai-ichi nuclear power plant in
March 2011 large amounts of radioactivity were released and distributed in the
atmosphere. Among them were also radioactive noble gas isotopes which can be
used as tracers to test global atmospheric circulation models. This work
presents unique measurements of the radionuclide $^{133}$Xe from Fukushima in
the upper troposphere above Germany. The measurements involve air sampling in a
research jet aircraft followed by chromatographic xenon extraction and
ultra-low background gas counting with miniaturized proportional counters. With
this technique a detection limit of the order of 100 $^{133}$Xe atoms in
litre-scale air samples (corresponding to about 100 mBq/m$^3$) is achievable.
Our results provide proof that the $^{133}$Xe-rich ground level air layer from
Fukushima was lifted up to the tropopause and distributed hemispherically.
Moreover, comparisons with ground level air measurements indicate that the
arrival of the radioactive plume at high altitude over Germany occurred several
days before the ground level plume.


title: On the asymptotics of the scenery flow

abstract:
  Various notions of "zooming in" on measures exist in the literature and the
scenery flow is one of them. It is of interest to describe the joint
asymptotics of the scenery flows generated by a measure and the measure
transported by a local diffeomorphism. We give both sufficient and necessary
conditions for the scenery distributions to be asymptotic and provide some
examples.


title:
Stellar granulation as seen in disk-integrated intensity. I. Simplified
  theoretical modeling

abstract:
  The solar granulation is known for a long time to be a surface manifestation
of convection. Thanks to the current space-borne missions CoRoT and Kepler, it
is now possible to observe in disk-integrated intensity the signature of this
phenomena in a growing number of stars. The space-based photometric
measurements show that the global brightness fluctuations and the lifetime
associated with granulation obeys characteristic scaling relations. We thus aim
at providing a simple theoretical modeling to reproduce these scaling relations
and subsequently at inferring the physical properties of granulation properties
across the HR diagram.
  We develop a simple 1D theoretical model that enable us to test any
prescription concerning the time-correlation between granules. The input
parameters of the model are extracted from 3D hydrodynamical models of the
surface layers of stars, and the free parameters involved in the model are
calibrated with solar observations. Two different prescriptions for
representing the eddy time-correlation in the Fourier space are compared: a
Lorentzian and an exponential form. Finally, we compare our theoretical
prediction with a 3D radiative hydrodynamical (RHD) numerical modeling of
stellar granulation (ab-initio approach). Provided that the free parameters are
appropriately adjusted, our theoretical model satisfactorily reproduces the
shape and the amplitude of the observed solar granulation spectrum. The best
agreement is obtained with an exponential form. Furthermore, our theoretical
model results in granulation spectra that consistently agree with the these
calculated on the basis of the ab-initio approach with two 3D RHD models.
Comparison between theoretical granulation spectra calculated with the present
model and high precision photometry measurements of stellar granulation is
undertaken in a companion paper.


title: Skew Generalized Quasi-Cyclic Codes over Finite Fields

abstract:
  In this work, we study a class of generalized quasi-cyclic (GQC) codes called
skew GQC codes. By the factorization theory of ideals, we give the Chinese
Remainder Theorem over the skew polynomial ring, which leads to a canonical
decomposition of skew GQC codes. We also focus on some characteristics of skew
GQC codes in details. For a 1-generator skew GQC code, we define the
parity-check polynomial, determine the dimension and give a lower bound on the
minimum Hamming distance. The skew quasi-cyclic (QC) codes are also discussed
briefly.


title:
FPU physics with nanomechanical graphene resonators: intrinsic
  relaxation and thermalization from flexural mode coupling

abstract:
  Thermalization in nonlinear systems is a central concept in statistical
mechanics and has been extensively studied theoretically since the seminal work
of Fermi, Pasta and Ulam (FPU). Using molecular dynamics and continuum modeling
of a ring-down setup, we show that thermalization due to nonlinear mode
coupling intrinsically limits the quality factor of nanomechanical graphene
drums and turns them into potential test beds for FPU physics. We find the
thermalization rate $\Gamma$ to be independent of radius and scaling as
$\Gamma\sim T^*/\epsilon_{{\rm pre}}^2$, where $T^*$ and $\epsilon_{{\rm pre}}$
are effective resonator temperature and prestrain.


title: Quasi-Cyclic Codes Over Finite Chain Rings

abstract:
  In this paper, we mainly consider quasi-cyclic (QC) codes over finite chain
rings. We study module structures and trace representations of QC codes, which
lead to some lower bounds on the minimum Hamming distance of QC codes.
Moreover, we investigate the structural properties of 1-generator QC codes.
Under some conditions, we discuss the enumeration of 1-generator QC codes and
describe how to obtain the one and only one generator for each 1-generator QC
code.