title: Multi-task Domain Adaptation for Sequence Tagging

abstract:
  Many domain adaptation approaches rely on learning cross domain shared
representations to transfer the knowledge learned in one domain to other
domains. Traditional domain adaptation only considers adapting for one task. In
this paper, we explore multi-task representation learning under the domain
adaptation scenario. We propose a neural network framework that supports domain
adaptation for multiple tasks simultaneously, and learns shared representations
that better generalize for domain adaptation. We apply the proposed framework
to domain adaptation for sequence tagging problems considering two tasks:
Chinese word segmentation and named entity recognition. Experiments show that
multi-task domain adaptation works better than disjoint domain adaptation for
each task, and achieves the state-of-the-art results for both tasks in the
social media domain.


title: Arbitrage-Free XVA

abstract:
  We develop a framework for computing the total valuation adjustment (XVA) of
a European claim accounting for funding costs, counterparty credit risk, and
collateralization. Based on no-arbitrage arguments, we derive backward
stochastic differential equations (BSDEs) associated with the replicating
portfolios of long and short positions in the claim. This leads to the
definition of buyer's and seller's XVA, which in turn identify a no-arbitrage
interval. In the case that borrowing and lending rates coincide, we provide a
fully explicit expression for the unique XVA, expressed as a percentage of the
price of the traded claim, and for the corresponding replication strategies. In
the general case of asymmetric funding, repo and collateral rates, we study the
semilinear partial differential equations (PDE) characterizing buyer's and
seller's XVA and show the existence of a unique classical solution to it. To
illustrate our results, we conduct a numerical study demonstrating how funding
costs, repo rates, and counterparty risk contribute to determine the total
valuation adjustment.


title:
Wolter-I-like X-ray telescope structure using one conical mirror and one
  quadric mirror

abstract:
  Nested multilayer mirrors are commonly used in X-ray telescope structures to
increase the collecting area. To balance the difficulty and cost of producing
these mirrors, the classical Wolter-I structure has previously been replaced
with a conical Wolter-I structure, but it can lead to significantly poorer
angular resolution. In this paper, we consider changing one of the mirror
shapes (paraboloid or hyperboloid) of the Wolter-I structure to a conical
mirror shape, while the other mirror shape remains a quadric surface-type
structure, which could thus ensure the imaging quality. Based on a theoretical
analysis and the results of simulations, the cone-hyperboloid and
paraboloid-cone structures are found to provide the best angular resolutions,
and the cone-hyperboloid structure is shorter than the paraboloid-cone
structure at the focal length. The cone-hyperboloid structure is then nested to
obtain the best on-axis angular resolution and off-axis images.


title:
Proceedings Combined 23rd International Workshop on Expressiveness in
  Concurrency and 13th Workshop on Structural Operational Semantics

abstract:
  This volume contains the proceedings of the Combined 23nd International
Workshop on Expressiveness in Concurrency and the 13th Workshop on Structural
Operational Semantics (EXPRESS/SOS 2016) which was held on 22 August 2016 in
Qu\'ebec City, Canada, as an affiliated workshop of CONCUR 2016, the 27th
International Conference on Concurrency Theory. The EXPRESS workshops aim at
bringing together researchers interested in the expressiveness of various
formal systems and semantic notions, particularly in the field of concurrency.
Their focus has traditionally been on the comparison between programming
concepts (such as concurrent, functional, imperative, logic and object-oriented
programming) and between mathematical models of computation (such as process
algebras, Petri nets, event structures, modal logics, and rewrite systems) on
the basis of their relative expressive power. The EXPRESS workshop series has
run successfully since 1994 and over the years this focus has become broadly
construed. The SOS workshops aim at being a forum for researchers, students and
practitioners interested in new developments, and directions for future
investigation, in the field of structural operational semantics. One of the
specific goals of the SOS workshop series is to establish synergies between the
concurrency and programming language communities working on the theory and
practice of SOS. Since 2012, the EXPRESS and SOS communities have organized an
annual combined EXPRESS/SOS workshop on the expressiveness of mathematical
models of computation and the formal semantics of systems and programming
concepts.


title: Deeply Semantic Inductive Spatio-Temporal Learning

abstract:
  We present an inductive spatio-temporal learning framework rooted in
inductive logic programming. With an emphasis on visuo-spatial language, logic,
and cognition, the framework supports learning with relational spatio-temporal
features identifiable in a range of domains involving the processing and
interpretation of dynamic visuo-spatial imagery. We present a prototypical
system, and an example application in the domain of computing for visual arts
and computational cognitive science.


title: A Colored KNT Neutrino Model

abstract:
  We propose a radiative seesaw model at the three-loop level, in which quarks,
leptons, leptoquark bosons, and a Majorana fermion of dark matter candidate are
involved in the neutrino loop. Analyzing neutrino oscillation data including
all possible constraints such as flavor changing neutral currents, lepton
flavor violations, upper/lower bound on the mass of leptoquark from the
collider physics, and the measured relic density of the dark matter, we show
the allowed region to satisfy all the data/constraints.


title:
An optimal discrimination of two mixed qubit states with a fixed rate of
  inconclusive results

abstract:
  In this paper we consider the optimal discrimination of two mixed qubit
states for a measurement that allows a fixed rate of inconclusive
results(FRIR). Our strategy for the problem is to transform the FRIR of two
qubit states into a minimum error discrimination for three qubit states by
adding a specific quantum state $\rho_{0}$ and a prior probability
$q_{0}$(which we will call an inconclusive degree), which we name the modified
FRIR problem. First, we investigate special inconclusive degrees $q_{0}^{(0)}$
and $q_{0}^{(1)}$, which appear naturally in the modified FRIR problem and are
the beginning and the end of practical interval of inconclusive degree, and
find the analytic form of them. Next, we show that the modified FRIR problem
can be classified into two cases $q_{0}=q_{0}^{(0)}$(or $q_{0}=q_{0}^{(1)}$)
and $q_{0}^{(0)}\!<\!q_{0}\!<\!q_{0}^{(1)}$. In fact, by maximum confidences of
two qubit states and non-diagonal element of $\rho_{0}$, the modified FRIR
problem is completely understood. Then, we provide an analytic solution of the
FRIR problem when $q_{0}=q_{0}^{(0)}$(or $q_{0}=q_{0}^{(1)}$). However, when
$q_{0}^{(0)}\!<\!q_{0}\!<\!q_{0}^{(1)}$, we rather supply the numerical method
to find the solution, because of the complex relation between inconclusive
degree and corresponding failure probability. Finally we confirm our results
using previously known examples.


title:
Constrained field theories on spherically symmetric spacetimes with
  horizons

abstract:
  We apply the Dirac-Bergmann algorithm for the analysis of constraints to
gauge theories defined on spherically symmetric black hole backgrounds. We find
that the constraints for a given theory are modified on such spacetimes through
the presence of additional contributions from the horizon. As a concrete
example, we consider the Maxwell field on a black hole background, and
determine the role of the horizon contributions on the dynamics of the theory.


title: M\"obius disjointness for non-uniquely ergodic skew products

abstract:
  For $\tau>2$, let $T$ be a $C^\tau$ skew product map of the form
$(x+\alpha,y+h(x))$ on $\mathbb T^2$ over a rotation of the circle. We show
that if $T$ preserves a measurable section, then it is disjoint to the
M\"{o}bius sequence. This in particular implies that any non-uniquely ergodic
$C^\tau$ skew product map on $\mathbb T^2$ has a finite index factor that is
disjoint to the M\"{o}bius sequence.


title:
Pure Gaussian quantum states from passive Hamiltonians and an active
  local dissipative process

abstract:
  We investigate the problem of preparing a pure Gaussian state via reservoir
engineering. In particular, we consider a linear quantum system with a passive
Hamiltonian and with a single reservoir which acts only on a single site of the
system. We then give a full parametrization of the pure Gaussian states that
can be prepared by this type of quantum system.


title:
Convergence of Newton's method in shape optimisation via approximate
  normal functions

abstract:
  In this paper we propose a Newton method for shape functions defined on an
image set generated by the (Micheletti) metric group. We review basic
properties of the metric group and a quotient associated with the metric group
and a fixed domain. Taking into account the special structure of the second
shape derivative and its symmetric part allows us to distinguish between two
Hessians, the domain shape Hessian and the boundary shape Hessian. Using the
domain Hessian we define a Newton method on the metric group by discretising
the tangent space of the quotient via approximate normal functions using
reproducing kernels. Under suitable assumptions we are able to show superlinear
convergences of the Newton iterations and additionally convergence of the
shapes in the metric group. Finally we verify our findings in a number of
numerical experiments including a thorough numerical study of the impact of the
discretisation on the convergence speed.


title: A method of complex background estimation in astronomical images

abstract:
  In this paper, we present a novel approach to the estimation of strongly
varying backgrounds in astronomical images by means of small objects removal
and subsequent missing pixels interpolation. The method is based on the
analysis of a pixel local neighborhood and utilizes the morphological distance
transform. In contrast to popular background estimation techniques, our
algorithm allows for accurate extraction of complex structures, like galaxies
or nebulae. Moreover, it does not require multiple tuning parameters, since it
relies on physical properties of CCD image sensors - the gain and the read-out
noise characteristics. The comparison with other widely used background
estimators revealed higher accuracy of the proposed technique. The superiority
of the novel method is especially significant for the most challenging
fluctuating backgrounds. The size of filtered out objects is tunable, therefore
the algorithm may eliminate a wide range of foreground structures, including
the dark current impulses, cosmic rays or even entire galaxies in deep field
images.


title: On the surjectivity of the power maps of a class of solvable groups

abstract:
  Let $G$ be a group containing a nilpotent normal subgroup $N$ with central
series $\{N_j\}$, such that each $N_j/N_{j+1}$ is a $\mathbb{F}$-vector space
over a field $\mathbb{F}$ and the action of $G$ on $N_j/N_{j+1}$ induced by the
conjugation action is $\mathbb{F}$-linear. For $k\in \mathbb N$ we describe a
necessary and sufficient condition for all elements from any coset $xN$, $x\in
G$, to admit $k$-th roots in $G$, in terms of the action of $x$ on the
quotients $N_j/N_{j+1}.$ This yields in particular a condition for surjectivity
of the power maps, generalising various results known in special cases. For
$\mathbb{F}$-algebraic groups we also characterise the property in terms of
centralizers of elements. For a class of Lie groups, it is shown that
surjectivity of the $k$-th power map, $k\in \mathbb N$, implies the same for
the restriction of the map to the solvable radical of the group. The results
are applied in particular to the study of exponentiality of Lie groups.


title: Steerable Principal Components for Space-Frequency Localized Images

abstract:
  This paper describes a fast and accurate method for obtaining steerable
principal components from a large dataset of images, assuming the images are
well localized in space and frequency. The obtained steerable principal
components are optimal for expanding the images in the dataset and all of their
rotations. The method relies upon first expanding the images using a series of
two-dimensional Prolate Spheroidal Wave Functions (PSWFs), where the expansion
coefficients are evaluated using a specially designed numerical integration
scheme. Then, the expansion coefficients are used to construct a
rotationally-invariant covariance matrix which admits a block-diagonal
structure, and the eigen-decomposition of its blocks provides us with the
desired steerable principal components. The proposed method is shown to be
faster then existing methods, while providing appropriate error bounds which
guarantee its accuracy.


title: The exact order of the number of lattice points visible from the origin

abstract:
  We say a lattice point $X=(x_1,\ldots,x_m)$ is visible from the origin, if
$\gcd(x_1,...,x_m)=1$. In other word, there are no other lattice point on the
line segment from the origin $O$ to $X$. From J.E. Nymann's result, we know
that the number of lattice point from the origin in $[-r,r]^m$ is
$(2r)^m/\zeta(m)+$(Error term). We showed that the exact order of the error
term is $r^{m-1}$ for $m\ge3$.


title: Nine new open clusters within 500 pc from the Sun

abstract:
  One of the results of the Milky Way Star Clusters (MWSC) survey by Kharchenko
et al. (2013) was the detection of a slight under-density of old (ca. 1 Gyr)
clusters within the nearest kilo-parsec from the Sun. This under-density may be
due to an ineffectiveness in the detection of larger structures with lower
surface brightness. We report on our attempts to reveal such clusters. We
derived proper motions from a combination of Tycho-2 with URAT1, and obtained a
mean precision of about 1.4 mas/y per co-ordinate for 1.3 million stars north
of -20 degree declination. We cut the sky into narrow proper motion slices and
searched for spatial over-densities of stars in each slice. In optical and
near-infrared colour-magnitude diagrams stars from over-densities were than
examined to determine if they are compatible with isochrones of a cluster. We
estimated the field star contamination using our data and the Besancon Galactic
model.We detected 9 hitherto unknown open clusters in the vicinity of the Sun
with ages between 70 Myr and 1 Gyr, and distances between 200 and 500 pc.


title: On noise-resolution uncertainty in quantum field theory

abstract:
  An uncertainty inequality is presented that establishes a lower limit for the
product of the variance of the time-averaged intensity of a mode of a quantized
electromagnetic field and the degree of its spatial localization. The lower
limit is determined by the vacuum fluctuations within the volume corresponding
to the width of the mode. This result also leads to a generalized form of the
Heisenberg uncertainty principle for boson fields in which the lower limit for
the product of uncertainties in the spatial and momentum localization of a mode
is equal to the product of Planck's constant and a dimensionless functional
which reflects the joint signal-to-noise ratio of the position and momentum of
vacuum fluctuations in the region of the phase space occupied by the mode.
Experimental X-ray synchrotron measurements provide an initial verification of
the proposed theory in the case of Poisson statistics.


title:
Another example of duality between game-theoretic and measure-theoretic
  probability

abstract:
  This paper makes a small step towards a non-stochastic version of
superhedging duality relations in the case of one traded security with a
continuous price path. Namely, we prove the coincidence of game-theoretic and
measure-theoretic expectation for lower semicontinuous positive functionals. We
consider a new broad definition of game-theoretic probability, leaving the
older narrower definitions for future work.


title:
Energy Efficient Scheduling of Cloud Application Components with
  Brownout

abstract:
  It is common for cloud data centers meeting unexpected loads like request
bursts, which may lead to overloaded situation and performance degradation.
Dynamic Voltage Frequency Scaling and VM consolidation have been proved
effective to manage overloads. However, they cannot function when the whole
data center is overloaded. Brownout provides a promising direction to avoid
overloads through configuring applications to temporarily degrade user
experience. Additionally, brownout can also be applied to reduce data center
energy consumption. As a complementary option for Dynamic Voltage Frequency
Scaling and VM consolidation, our combined brownout approach reduces energy
consumption through selectively and dynamically deactivating application
optional components, which can also be applied to self-contained microservices.
The results show that our approach can save more than 20% energy consumption
and there are trade-offs between energy saving and discount offered to users.


title: Gauge see-saw: A mechanism for a light gauge boson

abstract:
  There has been rapidly growing interest in the past decade in a new gauge
boson which is considerably lighter than the standard model Z boson. A
well-known example of this kind is the so-called dark photon, and it is
actively searched for in various experiments nowadays. It would be puzzling to
have a new gauge boson which is neither massless nor electroweak scale, but
possesses a rather small yet nonzero mass. We present a mechanism that can
provide a light gauge boson as a result of a mass matrix diagonalization.


title:
Parameterized Algorithms for the Maximum Agreement Forest Problem on
  Multiple Rooted Multifurcating Trees

abstract:
  The Maximum Agreement Forest problem has been extensively studied in
phylogenetics. Most previous work is on two binary phylogenetic trees. In this
paper, we study a generalized version of the problem: the Maximum Agreement
Forest problem on multiple rooted multifurcating phylogenetic trees, from the
perspective of fixed-parameter algorithms. By taking advantage of a new
branch-and-bound strategy, two parameterized algorithms, with running times
$O(2.42^k m^3 n^4)$ and $O(2.74^k m^3 n^5)$, respectively, are presented for
the hard version and the soft version of the problem, which correspond to two
different biological meanings to the polytomies in multifurcating phylogenetic
trees.


title: Strand algebras and contact categories

abstract:
  We demonstrate an isomorphism between the homology of the strand algebra of
bordered Floer homology, and the category algebra of the contact category
introduced by Honda. This isomorphism provides a direct correspondence between
various notions of Floer homology and arc diagrams, on the one hand, and
contact geometry and topology on the other. In particular, arc diagrams
correspond to quadrangulated surfaces, idempotents correspond to certain basic
dividing sets, strand diagrams correspond to contact structures, and
multiplication of strand diagrams corresponds to stacking of contact
structures. The contact structures considered are cubulated, and the cubes are
shown to behave equivalently to local fragments of strand diagrams.


title:
Some problems on the boundary of fractal geometry and additive
  combinatorics

abstract:
  This paper is an exposition, with some new applications, of our results on
the growth of entropy of convolutions. We explain the main result on
$\mathbb{R}$, and derive, via a linearization argument, an analogous result for
the action of the affine group on $\mathbb{R}$. We also develop versions of the
results for entropy dimension and Hausdorff dimension. The method is applied to
two problems on the border of fractal geometry and additive combinatorics.
First, we consider attractors $X$ of compact families $\Phi$ of similarities of
$\mathbb{R}$. We conjecture that if $\Phi$ is uncountable and $X$ is not a
singleton (equivalently, $\Phi$ is not contained in a 1-parameter semigroup)
then $\dim X=1$. We show that this would follow from the classical overlaps
conjecture for self-similar sets, and unconditionally we show that if $X$ is
not a point and $\dim\Phi>0$ then $\dim X=1$. Second, we study a problem due to
Shmerkin and Keleti, who have asked how small a set $\emptyset\neq
Y\subseteq\mathbb{R}$ can be if at every point it contains a scaled copy of the
middle-third Cantor set $K$. Such a set must have dimension at least $\dim K$
and we show that its dimension is at least $\dim K+\delta$ for some constant
$\delta>0$.


title: Lyapunov-like functions involving Lie brackets

abstract:
  For a given closed target we embed the dissipative relation that defines a
control Lyapunov function in a more general differential inequality involving
Hamiltonians built from iterated Lie brackets. The solutions of the resulting
extended relation, here called degree-k control Lyapunov functions (k>=1), turn
out to be still sufficient for the system to be globally asymptotically
controllable to the target. Furthermore, we work out some examples where no
standard (i.e., degree-1) smooth control Lyapunov functions exist while a
smooth degree-k control Lyapunov function does exist, for some k>1. The
extension is performed under very weak regularity assumptions on the system, to
the point that, for instance, (set valued) Lie brackets of locally Lipschitz
vector fields are considered as well.


title: Induced fermionic charge and current densities in two-dimensional rings

abstract:
  For a massive quantum fermionic field, we investigate the vacuum expectation
values (VEVs) of the charge and current densities induced by an external
magnetic flux in a two-dimensional circular ring. Both the irreducible
representations of the Clifford algebra are considered. On the ring edges the
bag (infinite mass) boundary conditions are imposed for the field operator.
This leads to the Casimir type effect on the vacuum characteristics. The radial
current vanishes. The charge and the azimuthal current are decomposed into the
boundary-free and boundary-induced contributions. Both these contributions are
odd periodic functions of the magnetic flux with the period equal to the flux
quantum. An important feature that distinguishes the VEVs of the charge and
current densities from the VEV of the energy density, is their finiteness on
the ring edges. The current density is equal to the charge density for the
outer edge and has the opposite sign on the inner edge. The VEVs are peaked
near the inner edge and, as functions of the field mass, exhibit quite
different features for two inequivalent representations of the Clifford
algebra. We show that, unlike the VEVs in the boundary-free geometry, the
vacuum charge and the current in the ring are continuous functions of the
magnetic flux and vanish for half-odd integer values of the flux in units of
the flux quantum. Combining the results for two irreducible representations, we
also investigate the induced charge and current in parity and time-reversal
symmetric models. The corresponding results are applied to graphene rings with
the electronic subsystem described in terms of the effective Dirac theory with
the energy gap. If the energy gaps for two valleys of the graphene hexagonal
lattice are the same, the charge densities corresponding to the separate
valleys cancel each other, whereas the azimuthal current is doubled.


title: A Search for O_2 in CO-depleted Molecular Cloud Cores with Herschel

abstract:
  The general lack of molecular oxygen in molecular clouds is an outstanding
problem in astrochemistry. Extensive searches with SWAS, Odin and Herschel have
only produced two detections; upper limits to the O_2 abundance in the
remaining sources observed are about 1000 times lower than predicted by
chemical models.
  Previous atomic oxygen observations and inferences from observations of other
molecules indicated that high abundances of O atoms might be present in dense
cores exhibiting large amounts of CO depletion. Theoretical arguments
concerning the oxygen gas-grain interaction in cold dense cores suggested that,
if O atoms could survive in the gas after most of the rest of the heavy
molecular material has frozen out on to dust, then O_2 could be formed
efficiently in the gas. Using Herschel HIFI we searched a small sample of four
depletion cores - L1544, L694-2, L429, Oph D - for emission in the low
excitation O_2 N_J=3_3-1_2 line at 487.249 GHz. Molecular oxygen was not
detected and we derive upper limits to its abundance in the range N(O_2)/N(H_2)
= (0.6 - 1.6)x10^{-7}. We discuss the absence of O_2 in the light of recent
laboratory and observational studies.


title: A deep language model for software code

abstract:
  Existing language models such as n-grams for software code often fail to
capture a long context where dependent code elements scatter far apart. In this
paper, we propose a novel approach to build a language model for software code
to address this particular issue. Our language model, partly inspired by human
memory, is built upon the powerful deep learning-based Long Short Term Memory
architecture that is capable of learning long-term dependencies which occur
frequently in software code. Results from our intrinsic evaluation on a corpus
of Java projects have demonstrated the effectiveness of our language model.
This work contributes to realizing our vision for DeepSoft, an end-to-end,
generic deep learning-based framework for modeling software and its development
process.


title: Generators for the SIS/DIS region

abstract:
  We describe how the main neutrino interaction generators (GENIE, NEUT and
NuWro) used by current neutrino oscillation experiments treat the shallow and
deep inelastic region. We then compare their predictions for charged current
events in this region, in terms of transferred momentum as well as
multiplicities for different types of hadrons. We present additional
comparisons in the low hadronic invariant mass region, where the generators use
different custom models.


title:
Mean Box Pooling: A Rich Image Representation and Output Embedding for
  the Visual Madlibs Task

abstract:
  We present Mean Box Pooling, a novel visual representation that pools over
CNN representations of a large number, highly overlapping object proposals. We
show that such representation together with nCCA, a successful multimodal
embedding technique, achieves state-of-the-art performance on the Visual
Madlibs task. Moreover, inspired by the nCCA's objective function, we extend
classical CNN+LSTM approach to train the network by directly maximizing the
similarity between the internal representation of the deep learning
architecture and candidate answers. Again, such approach achieves a significant
improvement over the prior work that also uses CNN+LSTM approach on Visual
Madlibs.


title:
Doubly probabilistic representation for the stochastic porous media type
  equation

abstract:
  The purpose of the present paper consists in proposing and discussing a
doubly probabilistic representation for a stochastic porous media equation in
the whole space R^1 perturbed by a multiplicative coloured noise. For almost
all random realizations $\omega$, one associates a stochastic differential
equation in law with random coefficients, driven by an independent Brownian
motion.


title: Sharpening methods for finite volume schemes

abstract:
  We review sharpening methods for finite volume schemes, with an emphasis on
the basic structure of sharpening methods. It covers high order methods and non
linear techniques for linear advection, Glimm's method, anti-diffusion
techniques, the interaction of these techniques with the PDE structures.
Additional approaches like level sets, interface reconstruction and Vofire are
also discussed. We also present the algorithmic structure of the downwind
method for a simple two components problem.


title: Almost all non-archimedean Kakeya sets have measure zero

abstract:
  We study Kakeya sets over local non-archimedean fields with a probabilistic
point of view: we define a probability measure on the set of Kakeya sets as
above and prove that, according to this measure, almost all non-archimedean
Kakeya sets are neglectable according to the Haar measure. We also discuss
possible relations with the non-archimedean Kakeya conjecture.


title:
Analytical solution to the Riemann problem of 1D elastodynamics with
  general constitutive laws

abstract:
  Under the hypothesis of small deformations, the equations of 1D
elastodynamics write as a 2 x 2 hyperbolic system of conservation laws. Here,
we study the Riemann problem for convex and nonconvex constitutive laws. In the
convex case, the solution can include shock waves or rarefaction waves. In the
nonconvex case, compound waves must also be considered. In both convex and
nonconvex cases, a new existence criterion for the initial velocity jump is
obtained. Also, admissibility regions are determined. Lastly, analytical
solutions are completely detailed for various constitutive laws (hyperbola,
tanh and polynomial), and reference test cases are proposed.


title: Optical chirality in gyrotropic media: symmetry approach

abstract:
  We discuss optical chirality in different types of gyrotropic media. Our
analysis is based on the formalism of nongeometric symmetries of Maxwell's
equations in vacuum generalized to material media with given constituent
relations. This approach enables us to derive directly conservation laws
related to the nongeometric symmetries. For isotropic chiral media, we
demonstrate that likewise free electromagnetic field, both duality and helicity
generators belong to the basis set of nongeometric symmetries that guarantees
the conservation of optical chirality. In gyrotropic crystals, which exhibit
natural optical activity, the situation is quite different from the case of
isotropic media. For light propagating along certain crystallographic
direction, there arise two distinct cases, i.~e., (1) the duality is broken but
the helicity is preserved, or (2) only the duality symmetry survives. We show
that the existence of one of these symmetries (duality or helicity) is enough
to define optical chirality. In addition, we present examples of low-symmetry
media, where optical chirality can not be defined.


title: Ott-Antonsen attractiveness for parameter-dependent oscillatory networks

abstract:
  The Ott-Antonsen (OA) ansatz [Chaos 18, 037113 (2008), Chaos 19, 023117
(2009)] has been widely used to describe large systems of coupled phase
oscillators. If the coupling is sinusoidal and if the phase dynamics does not
depend on the specific oscillator, then the macroscopic behavior of the systems
can be fully described by a low-dimensional dynamics. Does the corresponding
manifold remain attractive when introducing an intrinsic dependence between an
oscillator's phase and its dynamics by additional, oscillator specific
parameters? To answer this we extended the OA ansatz and proved that
parameter-dependent oscillatory systems converge to the OA manifold given
certain conditions. Our proof confirms recent numerical findings that already
hinted at this convergence. Furthermore we offer a thorough mathematical
underpinning for networks of so-called theta neurons, where the OA ansatz has
just been applied. In a final step we extend our proof by allowing for
time-dependent and multi-dimensional parameters as well as for network
topologies other than global coupling. This renders the OA ansatz an excellent
starting point for the analysis of a broad class of realistic settings.


title: Euler and Chebyshev: From the sphere to the plane and backwards

abstract:
  We report on the works of Euler and Chebyshev on the drawing of geographical
maps. We point out relations with questions about the fitting of garments that
were studied by Chebyshev.


title: Quantitative K-theory and the K{\"u}nneth formula for operator algebras

abstract:
  In this paper, we apply quantitative operator K-theory to develop an
algorithm for computing K-theory for the class of filtered C *-algebras with
asymptotic finite nuclear decomposition. As a consequence, we prove the
K{\"u}nneth formula for C *-algebras in this class. Our main technical tool is
a quantitative Mayer-Vietoris sequence for K-theory of filtered C *-algebras.


title:
Griffiths phase and critical behavior in layered Sr$_2$IrO$_4$
  ferromagnet

abstract:
  We report the existence of Griffiths phase (GP) and its influence on critical
phenomena in layered Sr$_2$IrO$_4$ ferromagnet (T$_C$ = 221.5 K). The power law
behavior of inverse magentic susceptibility, 1/$\chi$(T) with exponent $\lambda
= 0.18(2)$ confirm the GP in the regime T$_C$ $<$ T $\leq$ T$_G$ = 279.0(5) K.
Moreover, the detailed critical analysis via modified Arrott plot method
exhibits unrealistic critical exponents $\beta$ = 0.77(1), $\gamma$ = 1.59(2)
and $\delta = 3.06(4)$, in corroboration with magneto-caloric study. The
abnormal exponent values have been viewed in context of ferromagnetic-Griffiths
phase transition. The GP has been further analyzed using Bray model, which
yields a reliable value of $\beta$ = 0.19(2), belonging to the two-dimensional
(2D) XYh$_4$ universality class with strong anisotropy present in
Sr$_2$IrO$_4$. The present study proposes Bray model as a possible tool to
investigate the critical behavior for Griffiths ferromagnets in place of
conventional Arrott plot analysis. The possible origins of GP and its
correlation with insulating nature of Sr$_2$IrO$_4$ have been discussed.


title:
Centres of blocks of finite groups with trivial intersection Sylow
  $p$-subgroups

abstract:
  For finite groups $G$ with non-abelian, trivial intersection Sylow
$p$-subgroups, the analysis of the Loewy structure of the centre of a block
allows us to deduce that a stable equivalence of Morita type does not induce an
algebra isomorphism between the centre of the principal block of $G$ and the
centre of the Brauer correspondent. This was already known for the Suzuki
groups; the result will be generalised to cover more groups with trivial
intersection Sylow $p$-subgroups.


title: OnionNet: Sharing Features in Cascaded Deep Classifiers

abstract:
  The focus of our work is speeding up evaluation of deep neural networks in
retrieval scenarios, where conventional architectures may spend too much time
on negative examples. We propose to replace a monolithic network with our novel
cascade of feature-sharing deep classifiers, called OnionNet, where subsequent
stages may add both new layers as well as new feature channels to the previous
ones. Importantly, intermediate feature maps are shared among classifiers,
preventing them from the necessity of being recomputed. To accomplish this, the
model is trained end-to-end in a principled way under a joint loss. We validate
our approach in theory and on a synthetic benchmark. As a result demonstrated
in three applications (patch matching, object detection, and image retrieval),
our cascade can operate significantly faster than both monolithic networks and
traditional cascades without sharing at the cost of marginal decrease in
precision.


title:
Multi-resonance split ring resonator structures at sub-terahertz
  frequencies

abstract:
  This paper reports on the computational development of novel architectures of
multi-resonance Split Ring Resonators (SRRs), for efficient manipulation of
Terahertz (THz) frequency beams. The conceived resonators are based on both a
capacitive and inductive scheme. Simulation results have been obtained for a 60
GHz to 240 GHz operational bandwidth.


title: Pfister involutions in characteristic two

abstract:
  In characteristic two, it is shown that a central simple algebra of degree
equal to a power of two with anisotropic orthogonal involution is totally
decomposable, if it becomes either anisotropic or metabolic over all extensions
of the ground field. A similar result is obtained for the case where this
algebra with involution is Brauer-equivalent to a quaternion algebra and it
becomes adjoint to a bilinear Pfister form over all splitting fields of the
algebra.


title: Posterior Sampling for Reinforcement Learning Without Episodes

abstract:
  This is a brief technical note to clarify some of the issues with applying
the application of the algorithm posterior sampling for reinforcement learning
(PSRL) in environments without fixed episodes. In particular, this paper aims
to:
  - Review some of results which have been proven for finite horizon MDPs
(Osband et al 2013, 2014a, 2014b, 2016) and also for MDPs with finite ergodic
structure (Gopalan et al 2014).
  - Review similar results for optimistic algorithms in infinite horizon
problems (Jaksch et al 2010, Bartlett and Tewari 2009, Abbasi-Yadkori and
Szepesvari 2011), with particular attention to the dynamic episode growth.
  - Highlight the delicate technical issue which has led to a fault in the
proof of the lazy-PSRL algorithm (Abbasi-Yadkori and Szepesvari 2015). We
present an explicit counterexample to this style of argument. Therefore, we
suggest that the Theorem 2 in (Abbasi-Yadkori and Szepesvari 2015) be instead
considered a conjecture, as it has no rigorous proof.
  - Present pragmatic approaches to apply PSRL in infinite horizon problems. We
conjecture that, under some additional assumptions, it will be possible to
obtain bounds $O( \sqrt{T} )$ even without episodic reset.
  We hope that this note serves to clarify existing results in the field of
reinforcement learning and provides interesting motivation for future work.


title: On Lower Bounds for Regret in Reinforcement Learning

abstract:
  This is a brief technical note to clarify the state of lower bounds on regret
for reinforcement learning. In particular, this paper:
  - Reproduces a lower bound on regret for reinforcement learning, similar to
the result of Theorem 5 in the journal UCRL2 paper (Jaksch et al 2010).
  - Clarifies that the proposed proof of Theorem 6 in the REGAL paper (Bartlett
and Tewari 2009) does not hold using the standard techniques without further
work. We suggest that this result should instead be considered a conjecture as
it has no rigorous proof.
  - Suggests that the conjectured lower bound given by (Bartlett and Tewari
2009) is incorrect and, in fact, it is possible to improve the scaling of the
upper bound to match the weaker lower bounds presented in this paper.
  We hope that this note serves to clarify existing results in the field of
reinforcement learning and provides interesting motivation for future work.


title: A mathematical and numerical framework for bubble meta-screens

abstract:
  The aim of this paper is to provide a mathematical and numerical framework
for the analysis and design of bubble meta-screens. An acoustic meta-screen is
a thin sheet with patterned subwavelength structures, which nevertheless has a
macroscopic effect on the acoustic wave propagation. In this paper, periodic
subwavelength bubbles mounted on a reflective surface (with Dirichlet boundary
condition) is considered. It is shown that the structure behaves as an
equivalent surface with Neumann boundary condition at the Minnaert resonant
frequency which corresponds to a wavelength much greater than the size of the
bubbles. Analytical formula for this resonance is derived. Numerical
simulations confirm its accuracy and show how it depends on the ratio between
the periodicity of the lattice, the size of the bubble, and the distance from
the reflective surface. The results of this paper formally explain the
super-absorption behavior observed in [V. Leroy et al., Phys. Rev. B, 2015].


title: Nucleon Transversity and Hyperon Polarization

abstract:
  We calculate the transverse polarizations of the produced hyperons in the
semi-inclusive deep inelastic scattering of unpolarized lepton beam on
transversely polarized nucleon, since these polarizations provide a potential
method for extracting the transversity distribution h1(x) of the nucleon. In
this calculation we use the SU(6) wavefunctions of the octet baryons and the
spectator model for the distribution functions of nucleons and the
fragmentation functions of hyperons. We find that that H1(z) of the Sigma
hyperons are much larger than that of the Lambda hyperon. Therefore, when one
tries to extract the transversity distribution h1(x) from the hyperon
polarizations, measuring the polarizations of the Sigma hyperons is more
efficient than Lambda.


title:
Ground States of Spin-1/2 Heisenberg Antiferromagnets with Frustration
  on a Diamond-Like Decorated Square Lattice

abstract:
  We study the ground-state phase diagram of a Heisenberg model with spin
$S=\frac{1}{2}$ on a diamond-like decorated square lattice. A diamond unit has
two types of antiferromagnetic exchange interactions, and the ratio $\lambda$
between the length of the diagonal bond and that of the other four edges
determines the strength of frustration. It has been pointed out [J. Phys. Soc.
Jpn {\bf85}, 033705 (2016)] that the so-called tetramer-dimer states, which are
expected to be stabilized in an intermediate region of $\lambda_{\rm
c}<\lambda<2$, are identical to the square-lattice dimer covering states, which
ignited renewed interest in high-dimensional diamond-like decorated lattices.
In order to determine the phase boundary $\lambda_{\rm c}$, we employ the
modified spin wave method to estimate the energy of the ferrimagnetic state and
obtain $\lambda_{\rm c}=0.974$. Our obtained magnetizations for
spin-$\frac{1}{2}$ sites and for spin-1 sites are $m=0.398$ and
$\tilde{m}=0.949$, and spin reductions are 20 \% and 5\%, respectively. This
indicates that spin fluctuation is much smaller than that of the
$S=\frac{1}{2}$ square-lattice antiferromagnet: thus, we can consider that our
obtained ground-state energy is highly accurate. Further, our numerical
diagonalization study suggests that other cluster states do not appear in the
ground-state phase diagram.


title:
Anomalies and symmetry fractionalization in reflection-symmetric
  topological order

abstract:
  One of the central ideas regarding anomalies in topological phases of matter
is that they imply the existence of higher-dimensional physics, with an anomaly
in a D-dimensional theory typically being cancelled by a bulk (D+1)-dimensional
symmetry-protected topological phase (SPT). We demonstrate that for some
topological phases with reflection symmetry, anomalies may actually be
cancelled by a D-dimensional SPT, provided that it comes embedded in an
otherwise trivial (D+1)-dimensional bulk. We illustrate this for the example of
$\mathbb{Z}_N$ topological order enriched with reflection symmetry in (2+1)D,
and along the way establish a classification of anomalous reflection symmetry
fractionalization patterns. In particular, we show that anomalies occur if and
only if both electric and magnetic quasiparticle excitations possess nontrivial
fractional reflection quantum numbers.


title: Spectral rigidity of complex projective spaces, revisited

abstract:
  A classical question in spectral geometry is, for each pair of nonnegative
integers $(p,n)$ such that $p\leq 2n$, if the eigenvalues of Laplacian on
$p$-forms of a compact K\"{a}hler manifold are the same as those of
$\mathbb{C}P^n$ equipped with the Fubini-Study metric, then whether or not this
K\"{a}hler manifold is holomorphically isometric to $\mathbb{C}P^n$. For every
positive even number $p$, we affirmatively solve this problem in all dimensions
$n$ with at most two possible exceptions. We also clarify in this paper some
gaps in previous literature concerned with this question, among which one is
related to the volume estimate of Fano K\"{a}hler-Einstein manifolds.


title:
Reliability Considerations for the Operation of Large Accelerator User
  Facilities

abstract:
  The lecture provides an overview of considerations relevant for achieving
highly reliable operation of accelerator based user facilities. The article
starts with an overview of statistical reliability formalism which is followed
by high reliability design considerations with examples. The article closes
with operational aspects of high reliability such as preventive maintenance and
spares inventory.


title:
Aurora Candidates from the Chronicle of Q\={i}ng Dynasty in Several
  Degrees of Relevance

abstract:
  We present the result of the survey of sunspots and auroras in ${\it
Q\bar{\imath}ngsh\check{\imath}ga\check{o}}$, the draft chronicle of ${\it
Q\bar{\imath}ng}$ dynasty, for the period of 1559-1912 CE, as a sequel of the
series of works surveying historical sunspot and aurora records, and providing
online data to the scientific community regarding the attained results. In
total of this ${\it Q\bar{\imath}ngsh\check{\imath}ga\check{o}}$ survey, we
found 111 records of night-sky luminous events with the keywords such as vapor
(${\it q\grave{\imath}}$), cloud (${\it y\acute{u}n}$), and light (${\it
gu\bar{a}ng}$), which may indicate auroras as well as some other phenomena.
Similarly keyword survey for sunspots were done, but no sunspot record was
found. In comparison with the aurora records in the western world, we found 14
of the 111 records have a corresponding record of simultaneous observation in
the western world and hence are very likely to be aurora. In order to
investigate the likeliness of the rest of the record being aurora, we
calculated the lunar age and the phase of a solar cycle for each record. After
these calculations, notable fraction of these records clustered near the full
moon were found statistically doubtful in considerations with atmospheric
optics, meanwhile a few records near the new moon could be more likely
interpreted as auroras including three records during the Maunder minimum.


title: Bayesian nonparametric sparse VAR models

abstract:
  High dimensional vector autoregressive (VAR) models require a large number of
parameters to be estimated and may suffer of inferential problems. We propose a
new Bayesian nonparametric (BNP) Lasso prior (BNP-Lasso) for high-dimensional
VAR models that can improve estimation efficiency and prediction accuracy. Our
hierarchical prior overcomes overparametrization and overfitting issues by
clustering the VAR coefficients into groups and by shrinking the coefficients
of each group toward a common location. Clustering and shrinking effects
induced by the BNP-Lasso prior are well suited for the extraction of causal
networks from time series, since they account for some stylized facts in
real-world networks, which are sparsity, communities structures and
heterogeneity in the edges intensity. In order to fully capture the richness of
the data and to achieve a better understanding of financial and macroeconomic
risk, it is therefore crucial that the model used to extract network accounts
for these stylized facts.


title:
Dwell-time stability and stabilization conditions for linear positive
  impulsive and switched systems

abstract:
  Several results regarding the stability and the stabilization of linear
impulsive positive systems under arbitrary, constant, minimum, maximum and
range dwell-time are obtained. The proposed stability conditions characterize
the pointwise decrease of a linear copositive Lyapunov function and are
formulated in terms of finite-dimensional or semi-infinite linear programs. To
be applicable to uncertain systems and to control design, a lifting approach
introducing a clock-variable is then considered in order to make the conditions
affine in the matrices of the system. The resulting stability and stabilization
conditions are stated as infinite-dimensional linear programs for which three
asymptotically exact computational methods are proposed and compared with each
other on numerical examples. Similar results are then obtained for linear
positive switched systems by exploiting the possibility of reformulating a
switched system as an impulsive system. Some existing stability conditions are
retrieved and extended to stabilization using the proposed lifting approach.
Several examples are finally given for illustration.


title:
NORSE: A solver for the relativistic non-linear Fokker-Planck equation
  for electrons in a homogeneous plasma

abstract:
  Energetic electrons are of interest in many types of plasmas, however
previous modeling of their properties has been restricted to the use of linear
Fokker-Planck collision operators or non-relativistic formulations. Here, we
describe a fully non-linear kinetic-equation solver, capable of handling large
electric-field strengths (compared to the Dreicer field) and relativistic
temperatures. This tool allows modeling of the momentum-space dynamics of the
electrons in cases where strong departures from Maxwellian distributions may
arise. As an example, we consider electron runaway in magnetic-confinement
fusion plasmas and describe a transition to electron slide-away at field
strengths significantly lower than previously predicted.


title:
Finite sample bounds for expected number of false rejections under
  martingale dependence with applications to FDR

abstract:
  Much effort has been made to improve the famous step up test of Benjamini and
Hochberg given by linear critical values $\frac{i\alpha}{n}$. It is pointed out
by Gavrilov, Benjamini and Sarkar that step down multiple tests based on the
critical values $\beta_i=\frac{i\alpha}{n+1-i(1-\alpha)}$ still control the
false discovery rate (FDR) at the upper bound $\alpha$ under basic independence
assumptions. Since that result in not longer true for step up tests or
dependent single tests, a big discussion about the corresponding FDR starts in
the literature. The present paper establishes finite sample formulas and bounds
for the FDR and the expected number of false rejections for multiple tests
using critical values $\beta_i$ under martingale and reverse martingale
dependence models. It is pointed out that martingale methods are natural tools
for the treatment of local FDR estimators which are closely connected to the
present coefficients $\beta_i.$ The martingale approach also yields new results
and further inside for the special basic independence model.


title: Polarons and Molecules in a Fermi Gas with Orbital Feshbach Resonance

abstract:
  We study the impurity problem in a gas of $^{173}$Yb atoms near the recently
discovered orbital Feshbach resonance. In an orbital Feshbach resonance, atoms
in the electronic ground state $^1S_0$ interact with those in the long-lived
excited $^3P_0$ state with magnetically tunable interactions. We consider an
impurity atom with a given hyperfine spin in the $^3P_0$ state interacting with
a single-component Fermi sea of atoms in the ground $^1S_0$ manifold. Close to
the orbital Feshbach resonance, the impurity can induce collective
particle-hole excitations out of the Fermi sea, which can be regarded as the
polaron state. While as tuning toward the BEC regime of the resonance, a
molecular state becomes the ground state of the system. We show that a polaron
to molecule transition exists in $^{173}$Yb atoms close to the orbital Feshbach
resonance. Furthermore, due to the spin-exchange nature of the orbital Feshbach
resonance, the formation of both the polaron and the molecule involve
spin-flipping processes with interesting density distributions among the
relevant hyperfine spin states. We show that the polaron to molecule transition
can be detected using Raman spectroscopy.


title: Beam Transfer and Machine Protection

abstract:
  Beam transfer, such as injection into or extraction from an accelerator, is
one of the most critical moments in terms of machine protection in a
high-intensity machine. Special equipment is used and machine protection
aspects have to be taken into account in the design of the beam transfer
concepts. A brief introduction of the principles of beam transfer and the
equipment involved will be given in this lecture. The main concepts of machine
protection for injection and extraction will be presented, with examples from
the CERN SPS and LHC.


title: Holomorphic Hilbert Bundles and the Frame Existence Problem

abstract:
  We show that if $A=K(l^2)+ \mathbb{C}I_{l^2}$, then there exists a Hilbert
$A$-module that possess no frames.


title:
Near-field relaxation of a quantum emitter to 2D semiconductors: surface
  dissipation and exciton polaritons

abstract:
  The total spontaneous emission rate of a quantum emitter in the presence of
an infinite MoS\textsubscript{2} monolayer is enhanced by several orders of
magnitude, compared to its free-space value, due to the excitation of surface
exciton polariton modes and lossy modes. The spectral and distance dependence
of the spontaneous emission rate are analyzed and the lossy-surface-wave,
surface exciton polariton mode and radiative contributions are identified. The
transverse magnetic and transverse electric exciton polariton modes can be
excited for different emission frequencies of the quantum emitter, and their
contributions to the total spontaneous emission rate are different. To
calculate these different decay rates, we use the non-Hermitian description of
light-matter interactions, employing a Green's tensor formalism. The distance
dependence follows different trends depending on the emission energy of quantum
emitter. For the case of the lossy surface waves, the distance dependence
follows a $z^{-n}$, $n=2,3,4$, trend. When transverse magnetic exciton
polariton modes are excited, they dominate and characterize the distance
dependence of the spontaneous emission rate of a quantum emitter in the
presence of the MoS\textsubscript{2} layers. The interaction between a quantum
emitter and a MoS\textsubscript{2} superlattice is investigated and we observe
a splitting of the modes supported by the superlattice. Moreover, a blue shift
of the peak values of the spontaneous emission rate of a quantum emitter is
observed as the number of layers is increased. The field distribution profiles,
created by a quantum emitter, are used to explain this behavior.


title:
Variation of acoustic cutoff period with height in the solar atmosphere:
  theory versus observations

abstract:
  Recently Wi\'sniewska et al. demonstrated observationally how the acoustic
cutoff frequency varies with height in the solar atmosphere including the upper
photosphere and the lower and middle chromosphere, and showed that the
observational results cannot be accounted for by the existing theoretical
formulas for the acoustic cutoff. In order to reproduce the observed variation
of the cutoff with atmospheric height, numerical simulations of impulsively
generated acoustic waves in the solar atmosphere are performed, and the
spectral analysis of temporal wave profiles is used to compute numerically
changes of the acoustic cutoff with height. Comparison of the numerical results
with the observational data shows good agreement, which clearly indicates that
the obtained results may be used to determine the structure of the background
solar atmosphere.


title:
Proposal for a Self-Excited Electrically Driven Surface Plasmon
  Polariton Generator

abstract:
  We propose a generator of surface plasmon polaritons (SPPs) which, unlike
spasers or plasmon lasers, does not require stimulated emission in the system.
Its principle of operation is based on a positive feedback which a classical
oscillating dipole experiences from a reflective surface located in its near
field. The generator design includes a nanocavity between two metal surfaces
which contains metal nanoparticles in its interior. The whole structure is
placed onto a prism surface that allows one to detect the generated SPPs in the
Kretschmann configuration. The generation process is driven by a moderate
constant voltage applied between the metal covers of the cavity. Both the
generation criterion and the steady-state operation of the generator are
discussed.


title: Electronic-structural Dynamics in Graphene

abstract:
  We review our recent time- and angle-resolved photoemission spectroscopy
experiments, which measure the transient electronic structure of optically
driven graphene. For pump photon energies in the near infrared
($\hbar\omega_{\text{pump}}=950$meV) we have discovered the formation of a
population-inverted state near the Dirac point, which may be of interest for
the design of THz lasing devices and optical amplifiers. At lower pump photon
energies ($\hbar\omega_{\text{pump}}<400$meV), for which interband absorption
is not possible in doped samples, we find evidence for free carrier absorption.
In addition, when mid-infrared pulses are made resonant with an infrared-active
in-plane phonon of bilayer graphene ($\hbar\omega_{\text{pump}}=200$meV), a
transient enhancement of the electron-phonon coupling constant is observed,
providing interesting perspective for experiments that report light-enhanced
superconductivity in doped fullerites in which a similar lattice mode was
excited. All the studies reviewed here have important implications for
applications of graphene in optoelectronic devices and for the dynamical
engineering of electronic properties with light.


title:
The seven sisters DANCe.II. Proper motions and the
  lithium-rotation-activity connection for G and K Pleiads

abstract:
  Stellar clusters are open windows to understand stellar evolution.
Specifically, the change with time and the dependence on mass of different
stellar properties. As such, they are our laboratories where different theories
can be tested. We try to understand the origin of the connection between
lithium depletion in F, G and K stars, rotation and activity, in particular in
the Pleiades open cluster. We have collected all the relevant data in the
literature, including information regarding rotation period, binarity and
activity, and cross-matched with proper motions, multi-wavelength photometry
and membership probability from the DANCe database. In order to avoid biases,
only Pleiades single members with probabilities larger than p=0.75 have been
included in the discussion. Results. The analysis confirms that there is a
strong link between activity, rotation and the lithium equivalent width excess,
specially for the range Lum(bol) = 0.5-0.2 Lsun (about K2-K7 spectral types or
0.75-0.95 Msun). It is not possible to disentangle these effects but we cannot
exclude that the observed lithium overabundance is partially an observational
effect due to enhanced activity, due to a large coverage by stellar spots
induced by high rotation rates. Since a bona fide lithium enhancement is
present in young, fast rotators, both activity and rotation should play a role
in the lithium problem.


title:
The role of CRKL in Breast Cancer Metastasis: Insights from Systems
  Biology

abstract:
  MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression
post-transcriptionally. They are involved in key biological processes and then
may play a major role in the development of human diseases including cancer, in
particular their involvement in breast cancer metastasis has been confirmed.
Recently, the authors of ref.(\cite{key1} have found that miR-429 may have a
role in the inhibition of breast cancer metastasis and have identified its
target gene CRKL as a potential candidate. In this paper, by using systems
biology tools we have shown that CRKL is involved in positive regulation of
ERK1/2 signaling pathway and contribute to the regulation of LYN through a
topological generalization of feed forward loop.


title:
Delay-minimizing capacity allocation in an infinite server queueing
  system

abstract:
  We consider a service system with an infinite number of exponential servers
sharing a finite service capacity. The servers are ordered according to their
speed, and arriving customers join the fastest idle server. A capacity
allocation is an infinite sequence of service rates. We study the probabilistic
properties of this system by considering overflows from sub-systems with a
finite number of servers. Several stability measures are suggested and
analysed. The tail of the series of service rates that minimizes the average
expected delay (service time) is shown to be approximately geometrically
decreasing. We use this property in order to approximate the optimal allocation
of service rates by constructing an appropriate dynamic program.


title: Strongly correlated Fermi systems as a new state of matter

abstract:
  The aim of this review paper is to expose a new state of matter exhibited by
strongly correlated Fermi systems represented by various heavy-fermion (HF)
metals, two-dimensional liquids like $\rm ^3He$, compounds with quantum spin
liquids, quasicrystals, and systems with one-dimensional quantum spin liquid.
We name these various systems HF compounds, since they exhibit the behavior
typical of HF metals. In HF compounds at zero temperature the unique phase
transition, dubbed throughout as the fermion condensation quantum phase
transition (FCQPT) can occur; this FCQPT creates flat bands which in turn lead
to the specific state, known as the fermion condensate. Unlimited increase of
the effective mass of quasiparticles signifies FCQPT; these quasiparticles
determine the thermodynamic, transport and relaxation properties of HF
compounds. Our discussion of numerous salient experimental data within the
framework of FCQPT resolves the mystery of the new state of matter. Thus, FCQPT
and the fermion condensation can be considered as the universal reason for the
non-Fermi liquid behavior observed in various HF compounds. We show
analytically and using arguments based completely on the experimental grounds
that these systems exhibit universal scaling behavior of their thermodynamic,
transport and relaxation properties. Therefore, the quantum physics of
different HF compounds is universal, and emerges regardless of the microscopic
structure of the compounds. This uniform behavior allows us to view it as the
main characteristic of a new state of matter exhibited by HF compounds.


title: Convolutional Oriented Boundaries

abstract:
  We present Convolutional Oriented Boundaries (COB), which produces multiscale
oriented contours and region hierarchies starting from generic image
classification Convolutional Neural Networks (CNNs). COB is computationally
efficient, because it requires a single CNN forward pass for contour detection
and it uses a novel sparse boundary representation for hierarchical
segmentation; it gives a significant leap in performance over the
state-of-the-art, and it generalizes very well to unseen categories and
datasets. Particularly, we show that learning to estimate not only contour
strength but also orientation provides more accurate results. We perform
extensive experiments on BSDS, PASCAL Context, PASCAL Segmentation, and
MS-COCO, showing that COB provides state-of-the-art contours, region
hierarchies, and object proposals in all datasets.


title:
miR-34a-5p and miR-34a-3p contribute to the signaling pathway of p53 by
  targeting overlapping sets of genes

abstract:
  In contrary to the common belief that only one strand of the pre-miRNA is
active (usually the 5p one that is the more abundant) while the second one
(miRNA*) is discarded, functional 5p and 3p have been observed for many miRNAs.
Among those miRNAs is miR-34a which is a target gene of the tumor suppressor
p53. In this paper we have re-examined the role of miR-34a-5p and miR-34a-3p in
the signaling pathway of p53. We found that they target overlapping sets of
genes (MDM2 and THBS1). By a GO enrichment analysis we found that THBS1 is
involved in cancer and metastasis relevant processes. We have also deduce that
p53, MDM2 and miR-34a are linked by a type 1 incoherent FFL that represent a
novel mechanism for accelerating the response of p53 to external stress
signals.


title:
A Rule-Based Change Impact Analysis Approach in Software Architecture
  for Requirements Changes

abstract:
  Software systems usually operate in a dynamic context where their
requirements change continuously and new requirements emerge frequently. A
single requirement hardly exists in isolation: it is related to other
requirements and to the software development artifacts that implement it. When
a requirements change is introduced, the requirements engineer may have to
manually analyze all requirements and architectural elements for a single
change. This may result in neglecting the actual impact of a change. We aim at
improving change impact analysis in software architecture for requirements
changes by using formal semantics of requirements relations, requirements
changes and traces between Requirements & Architecture. In our previous work we
presented a technique for change impact analysis in requirements. The technique
uses the formal semantics of requirements relations and changes. Its output is
a set of candidate requirements for the impact with proposed changes and a
propagation path in the requirements model. In this paper we present a
complementary technique which propagates requirements changes to software
architecture and finds out which architectural elements are impacted by these
changes. The formalization of requirements relations, changes and traces
between R&A is used to determine candidate architectural elements for the
impact of requirements changes in the architecture. The tool support is an
extension of our Tool for Requirements Inferencing and Consistency Checking
(TRIC). Our approach helps in the elimination of some false positive impacts in
change propagation. We illustrate our approach in an industrial example which
shows that the formal semantics of requirements relations, changes and traces
enables the identification of candidate architectural elements with the
reduction of some false positive impacts.


title: The multitrace matrix model: An alternative to Connes NCG and IKKT model

abstract:
  We present a new multitrace matrix model, which is a generalization of the
real quartic one matrix model, exhibiting dynamical emergence of a fuzzy
two-sphere and its non-commutative gauge theory. This provides a novel and a
much simpler alternative to Connes non-commutative geometry and to the IKKT
matrix model for emergent geometry in two dimensions.


title: Triple Correlations of Multiplicative Functions

abstract:
  In this paper, we find asymptotic formula for the following sum with explicit
error term: \[M_{x}(g_{1}, g_{2}, g_3)=\frac{1}{x}\sum_{n\le
x}g_{1}(F_1(n))g_{2}(F_2(n))g_{3} (F_3(n)),\] where $F_1(x), F_2(x)$ and
$F_3(x)$ are polynomials with integer coefficients and $g_1,g_2,g_3$ are
multilpicative functions with modulus less than or equal to $1.$
  Moreover, under some assumption on $g_1,g_2,$ we prove that as $x\rightarrow
\infty,$ \[\frac{1}{x}\sum\limits_{n\le x}g_1(n+3)g_2(n+2)\mu(n+1)=o(1)\] and
assuming $2$-point Chowla type conjecture we show that as $x\rightarrow
\infty,$ \[\frac{1}{x}\sum\limits_{n\le x}g_1(n+3)\mu(n+2)\mu(n+1)=o(1).\]


title: On super integral groups

abstract:
  A finite non-abelian group $G$ is called super integral if the spectrum,
Laplacian spectrum and signless Laplacian spectrum of its commuting graph
contain only integers. In this paper, we first compute various spectra of
several families of finite non-abelian groups and conclude that those groups
are super integral. As an application of our results we obtain some positive
integers $n$ such that $n$-centralizer groups are super integral. We also
obtain some positive rational numbers $r$ such that $G$ is super integral if it
has commutativity degree $r$. In the last section, we show that $G$ is super
integral if $G$ is not isomorphic to $S_4$ and its commuting graph is planar.
We conclude the paper showing that $G$ is super integral if its commuting graph
is toroidal.


title: SpEnD: Linked Data SPARQL Endpoints Discovery Using Search Engines

abstract:
  In this study, a novel metacrawling method is proposed for discovering and
monitoring linked data sources on the Web. We implemented the method in a
prototype system, named SPARQL Endpoints Discovery (SpEnD). SpEnD starts with a
"search keyword" discovery process for finding relevant keywords for the linked
data domain and specifically SPARQL endpoints. Then, these search keywords are
utilized to find linked data sources via popular search engines (Google, Bing,
Yahoo, Yandex). By using this method, most of the currently listed SPARQL
endpoints in existing endpoint repositories, as well as a significant number of
new SPARQL endpoints, have been discovered. Finally, we have developed a new
SPARQL endpoint crawler (SpEC) for crawling and link analysis.


title: Observation of von K\'arm\'an Vortex Street in an Atomic Superfluid Gas

abstract:
  We report on the experimental observation of vortex cluster shedding from a
moving obstacle in an oblate atomic Bose-Einstein condensate. At low obstacle
velocities $v$ above a critical value, vortex clusters consisting of two
like-sign vortices are generated to form a regular configuration like a von
K\'arm\'an street, and as $v$ is increased, the shedding pattern becomes
irregular with many different kinds of vortex clusters. In particular, we
observe that the Stouhal number associated with the shedding frequency exhibits
saturation behavior with increasing $v$. The regular-to-turbulent transition of
the vortex cluster shedding reveals remarkable similarities between a
superfluid and a classical viscous fluid. Our work opens a new direction for
experimental investigations of the superfluid Reynolds number characterizing
universal superfluid hydrodynamics.


title:
Resolving Spatial-Time Conflicts In A Set Of Any-angle Or
  Angle-constrained Grid Paths

abstract:
  We study the multi-agent path finding problem (MAPF) for a group of agents
which are allowed to move into arbitrary directions on a 2D square grid. We
focus on centralized conflict resolution for independently computed plans. We
propose an algorithm that eliminates conflicts by using local re-planning and
introducing time offsets to the execution of paths by different agents.
Experimental results show that the algorithm can find high quality
conflict-free solutions at low computational cost.


title:
MASTER optical polarization variability detection in the Microquasar
  V404 Cyg/GS2023+33

abstract:
  On 2015 June 15 the Swift space observatory discovered that the Galactic
black hole candidate V404 Cyg was undergoing another active X-ray phase, after
25 years of inactivity (Barthelmy et al. 2015). Twelve telescopes of the MASTER
Global Robotic Net located at six sites across four continents were the first
ground based observatories to start optical monitoring of the microquasar after
its gamma-ray wakeup at 18h 34m 09s U.T. on 2015 June 15 (Lipunov et al. 2015).
In this paper we report, for the first time, the discovery of variable optical
linear polarization, changing by 4-6% over a timescale of approximately 1 h, on
two different epochs. We can conclude that the additional variable polarization
arisies from the relativistic jet generated by the black hole in V404Cyg. The
polarization variability correlates with optical brightness changes, increasing
when the flux decreases.


title: Universal Logarithmic Scrambling in Many Body Localization

abstract:
  Out of time ordered correlator (OTOC) is recently introduced as a powerful
diagnose for quantum chaos. To go beyond, here we present an analytical
solution of OTOC for a non-chaotic many body localized (MBL) system, showing
distinct feature from quantum chaos and Anderson localization (AL). The OTOC is
found to fall only if the nearest distance between the two operators being
shorter than $\xi\ln t$, where $\xi$ is dimensionless localization length.
Thereafter, we found an universal power law decay of OTOC as $2^{-\xi\ln t}$,
implying an universal logarithmic growth of second R\'{e}nyi entropy, where
$\xi$ plays the role of information scrambling rate. A relation between
butterfly velocity and scrambling rate is found.


title: The electromagnetic form factors of the $\Lambda$ in the timelike region

abstract:
  The reaction $e^+e^- \to \bar \Lambda \Lambda$ is investigated for energies
close to the threshold. Specific emphasis is put on the role played by the
interaction in the final $\bar \Lambda \Lambda$ system which is taken into
account rigorously. For that interaction a variety of $\bar \Lambda \Lambda$
potential models is employed that have been constructed for the analysis of the
reaction $\bar p p \to \bar \Lambda \Lambda$ in the past. The enhancement of
the effective form factor for energies close to the $\bar \Lambda \Lambda$
threshold, seen in pertinent experiments, is reproduced. Predictions for the
$\Lambda$ electromagnetic form factors $G_M$ and $G_E$ in the timelike region
and for spin-dependent observables such as spin-correlation parameters are
presented.


title: Group Riesz and Frame Sequences: The Bracket and the Gramian

abstract:
  Given a discrete group and a unitary representation on a Hilbert space
$\mathcal{H}$, we prove that the notions of operator Bracket map and Gramian
coincide on a dense set of $\mathcal{H}$. As a consequence, combining this
result with known frame theory, we can recover in a simple way all previous
Bracket characterizations of Riesz and frame sequences generated by a single
element under a unitary representation.


title: A bright triggered twin-photon source in the solid state

abstract:
  A non-classical light source emitting pairs of identical photons represents a
versatile resource of interdisciplinary importance with applications in quantum
optics and quantum biology. Emerging research fields, which benefit from such
type of quantum light source, include quantum-optical spectroscopy or
experiments on photoreceptor cells sensitive to photon statistics. To date,
photon twins have mostly been generated using parametric downconversion
sources, relying on Poissonian number distributions, or atoms, exhibiting low
emission rates. Here, we propose and experimentally demonstrate the efficient,
triggered generation of photon twins using the energy-degenerate
biexciton-exciton radiative cascade of a single semiconductor quantum dot.
Deterministically integrated within a microlens, this nanostructure emits
highly-correlated photon pairs, degenerate in energy and polarization, at a
rate of up to (234 $\pm$ 4) kHz. Furthermore, we verify a significant degree of
photon-indistinguishability and directly observe twin-photon emission by
employing photon-number-resolving detectors, which enables the reconstruction
of the emitted photon number distribution.


title: Discovery of Very High Energy Gamma Rays from 1ES 1440+122

abstract:
  The BL Lacertae object 1ES 1440+122 was observed in the energy range from 85
GeV to 30 TeV by the VERITAS array of imaging atmospheric Cherenkov telescopes.
The observations, taken between 2008 May and 2010 June and totalling 53 hours,
resulted in the discovery of $\gamma$-ray emission from the blazar, which has a
redshift $z$=0.163. 1ES 1440+122 is detected at a statistical significance of
5.5 standard deviations above the background with an integral flux of
(2.8$\pm0.7_{\mathrm{stat}}\pm0.8_{\mathrm{sys}}$) $\times$ 10$^{-12}$
cm$^{-2}$ s$^{-1}$ (1.2\% of the Crab Nebula's flux) above 200 GeV. The
measured spectrum is described well by a power law from 0.2 TeV to 1.3 TeV with
a photon index of 3.1 $\pm$ 0.4$_{\mathrm{stat}}$ $\pm$ 0.2$_{\mathrm{sys}}$.
Quasi-simultaneous multi-wavelength data from the Fermi Large Area Telescope
(0.3--300 GeV) and the Swift X-ray Telescope (0.2--10 keV) are additionally
used to model the properties of the emission region. A synchrotron self-Compton
model produces a good representation of the multi-wavelength data. Adding an
external-Compton or a hadronic component also adequately describes the data.


title: A unified flow approach to smooth, even $L_p$-Minkowski problems

abstract:
  We study long-time existence and asymptotic behaviour for a class of
anisotropic, expanding curvature flows. For this we adapt new curvature
estimates, which were developed by Guan, Ren and Wang to treat some stationary
prescribed curvature problems. As an application we give a unified flow
approach to the existence of smooth, even $L_p$-Minkowski problems in
$\mathbb{R}^{n+1}$ for $p>-n-1.$


title:
Momentum Fractions carried by quarks and gluons in models of proton
  structure functions at small $x$

abstract:
  The paper reports analysis of momentum fractions carried by quarks and gluons
in models of Proton structure functions at small $x$. First, we analyze the
model proposed by Lastovicka based on self-similarity sometime back. We then
make a similar analysis for a second model based on the same notion which is
also free from singularity in $x$ : $0<x<1$. The predictions of both the models
are then compared with a recent QCD based Froissart bound compatible model of
proton structure function at small $x$, suggested by Block, Durand, Ha and
McKay. The results are then compared with the corresponding study in
perturbative and Lattice QCD.


title:
Superconductivity and fluctuation in Ba$_{1-p}$K$_p$Fe$_2$As$_2$ and
  Ba(Fe$_{1-n}$Co$_n$)$_2$As$_2$

abstract:
  We study the interplay of fluctuations and superconductivity in
BaFe$_2$As$_2$ (Ba-122) compounds with Ba and Fe substituted by K ($p$ doping)
and Co ($n$ doping), respectively. To this end we measured electronic Raman
spectra as a function of polarisation and temperature. We observe gap
excitations and fluctuations for all doping levels studied. The response from
fluctuations is much stronger for Co substitution and, according to the
selection rules and the temperature dependence, originates from the exchange of
two critical spin fluctuations with characteristic wave vectors $(\pm\pi, 0)$
and $(0,\pm\pi)$. At 22\% K doping ($p=0.22$), we find the same selection rules
and spectral shape for the fluctuations but the intensity is smaller by a
factor of 5. Since there exists no nematic region above the orthorhombic
spin-density-wave (SDW) phase the identification of the fluctuations via the
temperature dependence is not possible. The gap excitations in the
superconducting state indicate strongly anisotropic near-nodal gaps for Co
substitution which make the observation of collective modes difficult. The
variation with doping of the spectral weights of the $A_{1g}$ and $B_{1g}$ gap
features does not support the influence of fluctuations on Cooper pairing.
Therefore, the observation of Bardasis-Schrieffer modes inside the nearly clean
gaps on the K-doped side remains the only experimental evidence for the
relevance of fluctuations for pairing.


title: Trapped $^{173}$Yb Fermi gas across an orbital Feshbach resonance

abstract:
  Starting with the two-band description of an orbital Feshbach resonance, we
study superfluid properties of a trapped $^{173}$Yb Fermi gas under the
assumptions of a local-density approximation for the trapping potential and a
mean-field approximation for the intra-band Cooper pairings. In particular, we
investigate the competition and interplay between the pair-breaking effect that
is caused by the inter-band detuning energy, and the pair-breaking and
thermal-broadening effects that are simultaneously caused by the temperature.
We predict several experimental signatures that are directly caused by this
interplay including a spatial separation of superfluid and normal phases within
the trap, and could play decisive roles in probing two-band superfluidity in
these systems.


title: Advertising Competitions in Social Networks

abstract:
  In the present work, we study the advertising competition of several
marketing campaigns who need to determine how many resources to allocate to
potential customers to advertise their products through direct marketing while
taking into account that competing marketing campaigns are trying to do the
same. Potential customers rank marketing campaigns according to the offers,
promotions or discounts made to them. Taking into account the intrinsic value
of potential customers as well as the peer influence that they exert over other
potential customers we consider the network value as a measure of their
importance in the market and we find an analytical expression for it.We analyze
the marketing campaigns competition from a game theory point of view, finding a
closed form expression of the symmetric equilibrium offer strategy for the
marketing campaigns from which no campaign has any incentive to deviate. We
also present several scenarios, such as Winner-takes-all and Borda, but not the
only possible ones for which our results allow us to retrieve in a simple way
the corresponding equilibrium strategy.


title: On sets with few distinct distances

abstract:
  It is widely believed that point sets in the plane which determine few
distinct distances must have some special structure. In particular, such sets
are believed to be similar to a lattice. This note considers two different ways
to quantify this idea.
  Firstly, improving on a result of Hanson (see arXiv:1607.03442), it is proven
that if $P= A \times A$ with $A \subset \mathbb R$ and $P$ determines
$O(|A|^2)$ distinct distances, then $|A-A|=O\left(|A|^{2-\frac{2}{11}}\right)$.
This result gives further evidence that cartesian products which determine few
distinct distances have some additive structure.
  Secondly, it is shown that if a set $P \subset \mathbb R^2$ of $N$ points
determines $O(N/\sqrt {\log N})$ distinct distances, then there exists a
reflection $\mathcal R$ and a set $P' \subset P$ with $|P'| =\Omega (
\log^{3/2} N)$ such that $\mathcal R(P') \subset P$. In other words, sets with
few distinct distances have some degree of reflexive symmetry.


title: Domain shape dependence of semiclassical corrections to energy

abstract:
  Stationary solution of one-dimensional Sine-Gordon system is embedded in a
multidimensional theory with explicitly finite domain in the added spatial
dimensions. Semiclassical corrections to energy are calculated for static kink
solution with emphasis on the impact of scale of the domain as well as the
choice of boundary conditions on the results for rectangular cross-section.


title: $\Lambda(t)$ cosmology induced by a slowly varying Elko field

abstract:
  In this work the exact Friedmann-Robertson-Walker equations for an Elko
spinor field coupled to gravity in an Einstein-Cartan framework are presented.
The torsion functions coupling the Elko field spin-connection to gravity can be
exactly solved and the FRW equations for the system assume a relatively simple
form. In the limit of a slowly varying Elko spinor field there is a relevant
contribution to the field equations acting exactly as a time varying
cosmological model $\Lambda(t)=\Lambda_*+3\beta H^2$, where $\Lambda_*$ and
$\beta$ are constants. Observational data using distance luminosity from
magnitudes of supernovae constraint the parameters $\Omega_m$ and $\beta$,
which leads to a lower limit to the Elko mass. Such model mimics, then, the
effects of a dark energy fluid, here sourced by the Elko spinor field. The
density perturbations in the linear regime were also studied in the
pseudo-Newtonian formalism.


title: Deep Convolution Networks for Compression Artifacts Reduction

abstract:
  Lossy compression introduces complex compression artifacts, particularly
blocking artifacts, ringing effects and blurring. Existing algorithms either
focus on removing blocking artifacts and produce blurred output, or restore
sharpened images that are accompanied with ringing effects. Inspired by the
success of deep convolutional networks (DCN) on superresolution, we formulate a
compact and efficient network for seamless attenuation of different compression
artifacts. To meet the speed requirement of real-world applications, we further
accelerate the proposed baseline model by layer decomposition and joint use of
large-stride convolutional and deconvolutional layers. This also leads to a
more general CNN framework that has a close relationship with the conventional
Multi-Layer Perceptron (MLP). Finally, the modified network achieves a speed up
of 7.5 times with almost no performance loss compared to the baseline model. We
also demonstrate that a deeper model can be effectively trained with features
learned in a shallow network. Following a similar "easy to hard" idea, we
systematically investigate three practical transfer settings and show the
effectiveness of transfer learning in low-level vision problems. Our method
shows superior performance than the state-of-the-art methods both on benchmark
datasets and a real-world use case.


title: Matrix product formula for $U_q(A^{(1)}_2)$-zero range process

abstract:
  The $U_q(A^{(1)}_n)$-zero range processes introduced recently by Mangazeev,
Maruyama and the authors are integrable discrete and continuous time Markov
processes associated with the stochastic $R$ matrix derived from the well-known
$U_q(A_n^{(1)})$ quantum $R$ matrix. By constructing a representation of the
relevant Zamolodchikov-Faddeev algebra, we present, for $n=2$, a matrix product
formula for the steady state probabilities in terms of $q$-boson operators.


title: A General Framework for Static Profiling of Parametric Resource Usage

abstract:
  Traditional static resource analyses estimate the total resource usage of a
program, without executing it. In this paper we present a novel resource
analysis whose aim is instead the static profiling of accumulated cost, i.e.,
to discover, for selected parts of the program, an estimate or bound of the
resource usage accumulated in each of those parts. Traditional resource
analyses are parametric in the sense that the results can be functions on input
data sizes. Our static profiling is also parametric, i.e., our accumulated cost
estimates are also parameterized by input data sizes. Our proposal is based on
the concept of cost centers and a program transformation that allows the static
inference of functions that return bounds on these accumulated costs depending
on input data sizes, for each cost center of interest. Such information is much
more useful to the software developer than the traditional resource usage
functions, as it allows identifying the parts of a program that should be
optimized, because of their greater impact on the total cost of program
executions. We also report on our implementation of the proposed technique
using the CiaoPP program analysis framework, and provide some experimental
results. This paper is under consideration for acceptance in TPLP.


title: Topological recursion on the Bessel curve

abstract:
  The Witten-Kontsevich theorem states that a certain generating function for
intersection numbers on the moduli space of stable curves is a tau-function for
the KdV integrable hierarchy. This generating function can be recovered via the
topological recursion applied to the Airy curve $x=\frac{1}{2}y^2$. In this
paper, we consider the topological recursion applied to the irregular spectral
curve $xy^2=\frac{1}{2}$, which we call the Bessel curve. We prove that the
associated partition function is also a KdV tau-function, which satisfies
Virasoro constraints, a cut-and-join type recursion, and a quantum curve
equation. Together, the Airy and Bessel curves govern the local behaviour of
all spectral curves with simple branch points.


title: Effect of dipolar-angle on phospholipid assembly

abstract:
  We report the effect of lipid head-group dipole orientation on phase
behaviour of phospholipid assembly. The work explains molecular-scale mechanism
of ion-lipid, anesthetic-lipid interactions where reorientation of dipoles play
important role in membrane potential modification. Molecular Dynamics
simulations are performed to analyse structure-property relationship and
dynamical behaviour of lipid biomembranes considering coarse-grained model
interactions.


title: Hybrid metric-Palatini stars

abstract:
  We consider the internal structure and the physical properties of specific
classes of neutron, quark and Bose-Einstein Condensate stars in the hybrid
metric-Palatini gravity theory, which is a combination of the metric and
Palatini $f(R)$ formalisms. The theory is very successful in accounting for the
observed phenomenology, since it unifies local constraints at the Solar System
level and the late-time cosmic acceleration, even if the scalar field is very
light. We derive the equilibrium equations for a spherically symmetric
configuration (mass continuity and Tolman-Oppenheimer-Volkoff) in the framework
of hybrid metric-Palatini theory, and we investigate their solutions
numerically for different equations of state of neutron and quark matter, by
adopting for the scalar field potential a Higgs-type form. Stellar models,
described by the stiff fluid, radiation-like, the bag model and the
Bose-Einstein Condensate equations of state are explicitly constructed in both
General Relativity and hybrid metric-Palatini gravity, thus allowing an in
depth comparison between the predictions of these two gravitational theories.
As a general result it turns out that for all the considered equations of
state, hybrid metric-Palatini gravity stars are more massive than their general
relativistic counterparts. Furthermore, two classes of stellar models
corresponding to fixed forms of the scalar field are also investigated.
Interestingly enough, in the case of a constant scalar field the equation of
state of the matter takes the form of the bag model equation of state
describing quark matter. As a possible astrophysical application of the
obtained results we suggest that stellar mass black holes, with masses in the
range of $3.8M_{\odot}$ and $6M_{\odot}$, respectively, could be in fact hybrid
metric-Palatini gravity neutron or quark stars.


title: Canonical Correlation Inference for Mapping Abstract Scenes to Text

abstract:
  We describe a technique for structured prediction, based on canonical
correlation analysis. Our learning algorithm finds two projections for the
input and the output spaces that aim at projecting a given input and its
correct output into points close to each other. We demonstrate our technique on
a language-vision problem, namely the problem of giving a textual description
to an "abstract scene".


title:
Cross Section for Rydberg Antihydrogen Production via Charge Exchange
  Between Rydberg Positronium and Antiprotons in Magnetic Field

abstract:
  The antihydrogen formation by charge exchange between cold antiprotons and
Rydberg positronium Ps is studied by using the Classical Trajectory Monte Carlo
(CTMC) method.


title: Quantum phase transition induced by real-space topology

abstract:
  A quantum phase transition (QPT), including both topological and symmetry
breaking types, is usually induced by the change of global parameters, such as
external fields or global coupling constants. In this work, we demonstrate the
existence of QPT induced by the real-space topology of the system. We
investigate the groundstate properties of the tight-binding model on a
honeycomb lattice with the torus geometry based on exact results. It is shown
that the ground state experiences a second- order QPT, exhibiting the scaling
behavior, when the torus switches to a tube, which reveals the connection
between quantum phase and the real-space topology of the system.


title: Protection Related to High-power Targets

abstract:
  Target protection is an important part of machine protection. The beam power
in high-intensity accelerators is high enough that a single wayward pulse can
cause serious damage. Today's high-power targets operate at the limit of
available technology, and are designed for a very narrow range of beam
parameters. If the beam pulse is too far off centre, or if the beam size is not
correct, or if the beam density is too high, the target can be seriously
damaged. We will start with a brief introduction to high-power targets and then
move to a discussion of what can go wrong, and what are the risks. Next we will
discuss how to control the beam-related risk, followed by examples from a few
different accelerator facilities. We will finish with a detailed example of the
Oak Ridge Spallation Neutron Source target tune up and target protection.


title: Finding Endomorphisms of Drinfeld modules

abstract:
  We give an effective algorithm to determine the endomorphism ring of a
Drinfeld module, both over its field of definition and over a separable or
algebraic closure thereof. Using previous results we deduce an effective
description of the image of the adelic Galois representation associated to the
Drinfeld module, up to commensurability. We also give an effective algorithm to
decide whether two Drinfeld modules are isogenous, again both over their field
of definition and over a separable or algebraic closure thereof.


title: Efficient simulations with electronic open boundaries

abstract:
  We present a reformulation of the Hairy Probe method for introducing
electronic open boundaries that is appropriate for steady state calculations
involving non-orthogonal atomic basis sets. As a check on the correctness of
the method we investigate a perfect atomic wire of Cu atoms, and a perfect
non-orthogonal chain of H atoms. For both atom chains we find that the
conductance has a value of exactly one quantum unit, and that this is rather
insensitive to the strength of coupling of the probes to the system, provided
values of the coupling are of the same order as the mean inter-level spacing of
the system without probes. For the Cu atom chain we find in addition that away
from the regions with probes attached, the potential in the wire is uniform,
while within them it follows a predicted exponential variation with position.
We then apply the method to an initial investigation of the suitability of
graphene as a contact material for molecular electronics. We perform
calculations on a carbon nanoribbon to determine the correct coupling strength
of the probes to the graphene, and obtain a conductance of about two quantum
units corresponding to two bands crossing the Fermi surface. We then compute
the current through a benzene molecule attached to two graphene contacts and
find only a very weak current because of the disruption of the
$\pi$-conjugation by the covalent bond between the benzene and the graphene. In
all cases we find that very strong or weak probe couplings suppress the
current.


title:
Smearing of mass accretion rate variation by viscous processes in
  accretion disks in compact binary systems

abstract:
  Variation of mass supply rate from the companion can be smeared out by
viscous processes inside an accretion disk. By the time the flow reaches the
inner edge, the variation in X-rays needs not reflect the true variation of the
rate at the outer edge. However, if the viscosity fluctuates around a mean
value, one would expect the viscous time scale also to spread around a mean
value. In HMXBs, the size of the viscous Keplerian disk is smaller & thus such
a spread could be lower as compared to the LMXBs. If there is an increasing or
decreasing trend in viscosity, the interval between enhanced emission would be
modified systematically. In the absence of a full knowledge about the variation
of mass supply rates at the outer edge, we study ideal circumstances where
modulation must take place exactly in orbital time scales when there is an
ellipticity in the orbit. We study a few compact binaries using long term
RXTE/ASM(1.5-12 keV) & Swift/BAT(15-50keV) data to look for such effects & to
infer what these results can tell us about the viscous processes inside the
respective disks. We employ three different methods to seek imprints of
periodicity on the X-ray variation & found that in all the cases, the location
of the peak in the power density spectra is consistent with the orbital
frequencies. Interestingly, in HMXBs the peaks are sharp with high rms values,
consistent with a small Keplerian disk in a wind fed system. However, in LMXBs
with larger Keplerian disk, the peaks are spread out with much lower rms
values. X-ray reflections, or superhump phenomena which may also cause such
X-ray modulations would not be affected by the size of the Keplerian disk. Our
result confirms different sizes of Keplerian disks in 2 classes of binaries. If
the orbital period of a binary system is not known, it may be obtained with
reasonable accuracy for HMXBs & with lesser accuracy for LMXBs by our method.


title: The Laser calibration of the Atlas Tile Calorimeter during the LHC run 1

abstract:
  This article describes the Laser calibration system of the Atlas hadronic
Tile Calorimeter that has been used during the run 1 of the LHC. First, the
stability of the system associated readout electronics is studied. It is found
to be stable with variations smaller than 0.6 %. Then, the method developed to
compute the calibration constants, to correct for the variations of the gain of
the calorimeter photomultipliers, is described. These constants were determined
with a statistical uncertainty of 0.3 % and a systematic uncertainty of 0.2 %
for the central part of the calorimeter and 0.5 % for the end-caps. Finally,
the detection and correction of timing mis-configuration of the Tile
Calorimeter using the Laser system are also presented.


title: Minimax Lower Bounds on Dictionary Learning for Tensor Data

abstract:
  This paper provides fundamental limits on the sample complexity of estimating
dictionaries for tensor data. The specific focus of this work is on $K$th-order
tensor data and the case where the underlying dictionary can be expressed in
terms of $K$ smaller dictionaries. It is assumed the data are generated by
linear combinations of these structured dictionary atoms and observed through
white Gaussian noise. This work first provides a general lower bound on the
minimax risk of dictionary learning for such tensor data and then adapts the
proof techniques for specialized results in the case of sparse and
sparse-Gaussian linear combinations. The results suggest the sample complexity
of dictionary learning for tensor data can be significantly lower than that for
unstructured data: for unstructured data it scales linearly with the product of
the dictionary dimensions, whereas for tensor-structured data the bound scales
linearly with the sum of the product of the dimensions of the (smaller)
component dictionaries. A partial converse is provided for the case of
2nd-order tensor data to show that the bounds in this paper can be tight. This
involves developing an algorithm for learning highly-structured dictionaries
from noisy tensor data. Finally, numerical experiments highlight the advantages
associated with explicitly accounting for tensor data structure during
dictionary learning.