title:
Hard-tail emission in the soft state of low-mass X-ray binaries and
  their relation to the neutron star magnetic field

abstract:
  Average hard-tail X-ray emission in the soft state of nine bright Atoll
low-mass X-ray binaries containing a neutron star (NS-LMXBs) are investigated
by using the light curves of MAXI/GSC and Swift/BAT. Two sources (4U 1820$-$30
and 4U 1735$-$44) exhibit large hardness ratio (15--50 keV$/$2--10 keV: {\it
HR} $>$ 0.1), while the other sources distribute at {\it HR} $\ltsim$ 0.1. In
either case, {\it HR} does not depend on the 2--10 keV luminosity. Therefore
the difference of {\it HR} is due to the 15--50 keV luminosity, which is
Comptonized emission. The Compton cloud is assumed to be around the neutron
star. The size of the Compton cloud would affect the value of {\it HR}.
Although the magnetic field of NS-LMXB is weak, we could expect a larger
Alfv\'{e}n radius than the innermost stable circular orbit or the neutron star
radius in some sources. In such cases, the accretion inflow is stopped at the
Alfv\'{e}n radius and would create relatively large Compton cloud. It would
result in the observed larger Comptonized emission. By attributing the
difference of the size of Compton cloud to the Alfv\'{e}n radius, we can
estimate the magnetic fields of neutron star. The obtained lower/upper limits
are consistent with the previous results.


title: Fredholm Solvability of Time-Periodic Boundary Value Hyperbolic Problems

abstract:
  We investigate a large class of linear boundary value problems for the
general first-order one-dimensional hyperbolic systems in the strip
$[0,1]\times\R$. We state rather broad natural conditions on the data under
which the operators of the problems satisfy the Fredholm alternative in the
spaces of continuous and time-periodic functions. A crucial ingredient of our
analysis is a non-resonance condition, which is formulated in terms of the data
responsible for the bijective part of the Fredholm operator. In the case of
$2\times 2$ systems with reflection boundary conditions, we provide a criterium
for the non-resonant behavior of the system.


title: Two-dimensional traffic rules and the density classification problem

abstract:
  The density classification problem is the computational problem of finding
the majority in a given array of votes in a distributed fashion. It is known
that no cellular automaton rule with binary alphabet can solve the density
classification problem. On the other hand, it was shown that a probabilistic
mixture of the traffic rule and the majority rule solves the one-dimensional
problem correctly with a probability arbitrarily close to one. We investigate
the possibility of a similar approach in two dimensions. We show that in two
dimensions, the particle spacing problem, which is solved in one dimension by
the traffic rule, has no cellular automaton solution. However, we propose exact
and randomized solutions via interacting particle systems. We assess the
performance of our models using numeric simulations.


title: Elicitation for Preferences Single Peaked on Trees

abstract:
  In multiagent systems, we often have a set of agents each of which have a
preference ordering over a set of items and one would like to know these
preference orderings for various tasks, for example, data analysis, preference
aggregation, voting etc. However, we often have a large number of items which
makes it impractical to ask the agents for their complete preference ordering.
In such scenarios, we usually elicit these agents' preferences by asking (a
hopefully small number of) comparison queries --- asking an agent to compare
two items. Prior works on preference elicitation focus on unrestricted domain
and the domain of single peaked preferences and show that the preferences in
single peaked domain can be elicited by much less number of queries compared to
unrestricted domain. We extend this line of research and study preference
elicitation for single peaked preferences on trees which is a strict superset
of the domain of single peaked preferences. We show that the query complexity
crucially depends on the number of leaves, the path cover number, and the
distance from path of the underlying single peaked tree, whereas the other
natural parameters like maximum degree, diameter, pathwidth do not play any
direct role in determining query complexity. We then investigate the query
complexity for finding a weak Condorcet winner for preferences single peaked on
a tree and show that this task has much less query complexity than preference
elicitation. Here again we observe that the number of leaves in the underlying
single peaked tree and the path cover number of the tree influence the query
complexity of the problem.


title:
Holomorphic endomorphisms of P^3(C) related to a Lie algebra of type A_3
  and catastrophe theory

abstract:
  Chebyshev maps in the complex plane are typical chaotic maps. Veselov
generalized these map. We consider a class of those maps and view them as
holomorphic endomorphisms on the 3-dimensional complex projective space and
make use of the theory of complex dynamics in higher dimension. We determine
Julia sets and external rays of those maps, exactly. In the Julia sets, Moebius
strip and a special ruled surface appear. We also show some relation between
those maps and binary quartic forms.


title:
Multiscale inference for a multivariate density with applications to
  X-ray astronomy

abstract:
  In this paper we propose methods for inference of the geometric features of a
multivariate density. Our approach uses multiscale tests for the monotonicity
of the density at arbitrary points in arbitrary directions. In particular, a
significance test for a mode at a specific point is constructed. Moreover, we
develop multiscale methods for identifying regions of monotonicity and a
general procedure for detecting the modes of a multivariate density. It is is
shown that the latter method localizes the modes with an effectively optimal
rate. The theoretical results are illustrated by means of a simulation study
and a data example. The new method is applied to and motivated by the
determination and verification of the position of high-energy sources from
X-ray observations by the Swift satellite which is important for a
multiwavelength analysis of objects such as Active Galactic Nuclei.


title:
Measurement of coherent $\pi^{+}$ production in low energy
  neutrino-Carbon scattering

abstract:
  We report the first measurement of the flux-averaged cross section for
charged current coherent $\pi^{+}$ production on carbon for neutrino energies
less than 1.5 GeV to a restricted final state phase space region in the T2K
near detector, ND280. Comparisons are made with predictions from the
Rein-Sehgal coherent production model and the model by Alvarez-Ruso {\it et
al.}, the latter representing the first implementation of an instance of the
new class of microscopic coherent models in a neutrino interaction Monte Carlo
event generator. This results contradicts the null results reported by K2K and
SciBooNE in a similar neutrino energy region.


title:
An Anomalous Contrast of Insulators in Scanning Electron Microscope: The
  Split Image

abstract:
  A novel phenomenon of anomalous contrast in scanning electron microscope when
the instrument is used to observe an insulator specimen with a wolfram probe,
we called double imaging, is reported in this article. We give a detail
analysis of this phenomenon in its occurrence, and discuss the influence of the
added probe to internal electric field which lead to the occurrence of double
imaging.


title: Unconditional and bimonotone structures in high density Banach spaces

abstract:
  It is shown that every normalized weakly null sequence of length
$\kappa_{\lambda}$ in a Banach space has a subsequence of length $\lambda$
which is an unconditional basic sequence; here $\kappa_{\lambda}$ is a large
cardinal depending on a given infinite cardinal $\lambda$. Transfinite
topological games on Banach spaces are analyzed which determine the existence
of a long unconditional basic sequence. Then 'asymptotic disentanglement'
condition in a transfinite setting is studied which ensures a winning strategy
for the unconditional basic sequence builder in the above game. The following
problem is investigated: When does a Markushevich basic sequence with length
uncountable regular cardinal $\kappa$ admit a subsequence of the same length
which is a bimonotone basic sequence? Stabilizations of projectional
resolutions of the identity (PRI) are performed under a density contravariance
principle to gain some additional strong regularity properties, such as
bimonotonicity.


title:
Microwave emission by nonlinear crystals irradiated with a
  high-intensity, mode-locked laser

abstract:
  We report on the experimental investigation of the efficiency of some
nonlinear crystals to generate microwave (RF) radiation as a result of optical
rectification (OR) when irradiated with intense pulse trains delivered by a
mode-locked laser at $1064\,$nm. We have investigated lithium triborate (LBO),
lithium niobate (LiNbO$_3$), zinc selenide (ZnSe), and also potassium titanyl
orthophosphate (KTP) for comparison with previous measurements. The results are
in good agreement with the theoretical predictions based on the form of the
second-order nonlinear susceptibility tensor. For some crystals we investigated
also the second harmonic generation (SHG) to cross check the theoretical model.
We confirm the theoretical prediction that OR leads to the production of higher
order RF harmonics that are overtones of the laser repetition rate.


title: Multiple states in highly turbulent Taylor-Couette flow

abstract:
  The ubiquity of turbulent flows in nature and technology makes it of utmost
importance to fundamentally understand turbulence. Kolmogorov's 1941 paradigm
suggests that for strongly turbulent flows with many degrees of freedom and its
large fluctuations, there would only be \emph{one} turbulent state as the large
fluctuations would explore the entire higher-dimensional phase space. Here we
report the first conclusive evidence of multiple turbulent states for large
Reynolds number $\text{Re}=\mathcal{O}(10^6)$ (Taylor number
$\text{Ta}=\mathcal{O}(10^{12})$) Taylor-Couette flow in the regime of ultimate
turbulence, by probing the phase space spanned by the rotation rates of the
inner and outer cylinder. The manifestation of multiple turbulent states is
exemplified by providing combined global torque and local velocity
measurements. This result verifies the notion that bifurcations can occur in
high-dimensional flows i.e. very large $\text{Re}$) and questions Kolmogorov's
paradigm.


title:
The growth mechanism of CuO nanowires synthesized by the thermal
  oxidation method

abstract:
  Large-scale CuO nanowires are commonly synthesized by the thermal oxidation
method. However, the growth mechanism remains controversial between diffusion
growth mechanism and vapor-solid (VS) growth mechanism. In this study, we
investigated the morphology and atomic structure of the CuO nanowires by
electron microscopes to clarify the growth mechanism. We found that they were
grown with the annealing ambient during the cooling process and there were
screw dislocations in the nanowires. These features indicate that the VS growth
mechanism is applicable to explain the growth of the CuO nanowires. In
addition, the kinetic consideration also supports the VS growth mechanism.


title: Transient hidden chaotic attractors in a Hopfield neural system

abstract:
  In this letter we unveil the existence of transient hidden coexisting chaotic
attractors, in a simplified Hopfield neural network with three neurons.


title:
A Generalized Erasure Channel in the Sense of Polarization for Binary
  Erasure Channels

abstract:
  The polar transformation of a binary erasure channel (BEC) can be exactly
approximated by other BECs. Ar{\i}kan proposed that polar codes for a BEC can
be efficiently constructed by using its useful property. This study proposes a
new class of arbitrary input generalized erasure channels, which can be exactly
approximated the polar transformation by other same channel models, as with the
BEC. One of the main results is the recursive formulas of the polar
transformation of the proposed channel. In the study, we evaluate the polar
transformation by using the $\alpha$-mutual information. Particularly, when the
input alphabet size is a prime power, we examines the following: (i)
inequalities for the average of the $\alpha$-mutual information of the proposed
channel after the one-step polar transformation, and (ii) the exact proportion
of polarizations of the $\alpha$-mutual information of proposed channels in
infinite number of polar transformations.


title:
Partial reconstruction of the rotational motion of Philae spacecraft
  during its landing on comet 67P/Churyumov-Gerasimenko

abstract:
  This paper presents a partial reconstruction of the rotational dynamics of
the Philae spacecraft upon landing on comet 67P/Churyumov-Gerasimenko as part
of ESA's Rosetta mission. We analyze the motion and the events triggered by the
failure to fix the spacecraft to the comet surface at the time of the first
touchdown. Dynamic trajectories obtained by numerical simulation of a 7
degree-of-freedom mechanical model of the spacecraft are fitted to directions
of incoming solar radiation inferred from in-situ measurements of the electric
power provided by the solar panels. The results include a lower bound of the
angular velocity of the lander immediately after its first touchdown. Our study
also gives insight into the effect of the programmed turn-off of the
stabilizing gyroscope after touchdown; the important dynamical consequences of
a small collision during Philae's journey; and the probability that a similar
landing scenario harms the operability of this type of spacecraft.


title: The Grothendieck-Teichm\"uller group of $PSL(2, q)$

abstract:
  We show that the Grothendieck-Teichm\"uller group of $PSL(2, q)$, or more
precisely the group $GT_1(PSL(2, q))$ as previously defined by the author, is
the product of an elementary abelian 2-group and several copies of the dihedral
group of order 8. Moreover, when $q$ is even, we show that it is trivial.
  We explain how it follows that the moduli field of any "dessin d'enfant"
whose monodromy group is $PSL(2, q)$ has derived length less than 4.
  This paper can serve as an introduction to the general results on the
Grothendieck-Teichm\"uller group of finite groups obtained by the author.


title: Plane-Wave Propagation in Extreme Magnetoelectric (EME) Media

abstract:
  The extreme magnetoelectric medium (EME medium) is defined in terms of two
medium dyadics, $\alpha$, producing electric polarization by the magnetic field
and $\beta$, producing magnetic polarization by the electric field. Plane-wave
propagation of time-harmonic fields of fixed finite frequency in the EME medium
is studied. It is shown that (if $\omega\neq 0$) the dispersion equation has a
cubic and homogeneous form, whence the wave vector $k$ is either zero or has
arbitrary magnitude. In many cases there is no dispersion equation ("NDE
medium") to restrict the wave vector in an EME medium. Attention is paid to the
case where the two medium dyadics have the same set of eigenvectors. In such a
case the $k$ vector is restricted to three eigenplanes defined by the medium
dyadics. The emergence of such a result is demonstrated by considering a more
regular medium, and taking the limit of zero permittivity and permeability. The
special case of uniaxial EME medium is studied in detail. It is shown that an
interface of a uniaxial EME medium appears as a DB boundary when the axis of
the medium is normal to the interface. More in general, EME media display
interesting wave effects that can potentially be realized through metasurface
engineering.


title: Weak-local triple derivations on C*-algebras and JB*-triples

abstract:
  We prove that every weak-local triple derivation on a JB$^*$-triple $E$ (i.e.
a linear map $T: E\to E$ such that for each $\phi \in E^*$ and each $a\in E$,
there exists a triple derivation $\delta_{a,\phi} : E\to E$, depending on
$\phi$ and $a$, such that $\phi T(a) = \phi \delta_{a,\phi} (a)$) is a
(continuous) triple derivation.


title: The Exponential Cubic B-spline Algorithm for Burgers's Equation

abstract:
  The exponential cubic B-spline functions are used to set up the collocation
method for finding solutions of the Burgers's equation. The effect of the
exponential cubic B-splines in the collocation method is sought by studying
four text problems.


title:
A Trigonometric Cubic B-spline Finite Element Method for Solving the
  Nonlinear Coupled Burger Equation

abstract:
  The coupled Burgers equation is solved by way of the trigonometric B-spline
collocation method. The unknown of the coupled Burgers equation is integrated
in time by aid of the Crank-Nicolson method. Resulting time-integrated coupled
Burgers equation is discretized using the trigonometric cubic B-spline
collocation method. Fully-integrated couupled Burgers equation which is a
system of nonlinear algebraic equation is solved with a variant of Thomas
algorithm. The three model test problems are studied to illustrate the accuracy
of the suggested method.


title:
General solution of the Poisson equation for Quasi-Birth-and-Death
  processes

abstract:
  We consider the Poisson equation $(I-P)\boldsymbol{u}=\boldsymbol{g}$, where
$P$ is the transition matrix of a Quasi-Birth-and-Death (QBD) process with
infinitely many levels, $\bm g$ is a given infinite dimensional vector and $\bm
u$ is the unknown. Our main result is to provide the general solution of this
equation. To this purpose we use the block tridiagonal and block Toeplitz
structure of the matrix $P$ to obtain a set of matrix difference equations,
which are solved by constructing suitable resolvent triples.


title:
Stabilizing Transmission Intervals for Nonlinear Delayed Networked
  Control Systems [Extended Version]

abstract:
  In this article, we consider a nonlinear process with delayed dynamics to be
controlled over a communication network in the presence of disturbances and
study robustness of the resulting closed-loop system with respect to
network-induced phenomena such as sampled, distorted, delayed and lossy data as
well as scheduling protocols. For given plant-controller dynamics and
communication network properties (e.g., propagation delays and scheduling
protocols), we quantify the control performance level (in terms of Lp-gains) as
the transmission interval varies. Maximally Allowable Transfer Interval (MATI)
labels the greatest transmission interval for which a prescribed Lp-gain is
attained. The proposed methodology combines impulsive delayed system modeling
with Lyapunov-Razumikhin techniques to allow for MATIs that are smaller than
the communication delays. Other salient features of our methodology are the
consideration of variable delays, corrupted data and employment of model-based
estimators to prolong MATIs. The present stability results are provided for the
class of Uniformly Globally Exponentially Stable (UGES) scheduling protocols.
The well-known Round Robin (RR) and Try-Once-Discard (TOD) protocols are
examples of UGES protocols. Finally, two numerical examples are provided to
demonstrate the benefits of the proposed approach.


title: Tribonucleation of bubbles

abstract:
  We report on the nucleation of bubbles on solids that are gently rubbed
against each other in a liquid. The phenomenon is found to depend strongly on
the material and roughness of the solid surfaces. For a given surface,
temperature, and gas content, a trail of growing bubbles is observed if the
rubbing force and velocity exceed a certain threshold. Direct observation
through a transparent solid shows that each bubble in the trail results from
the early coalescence of several microscopic bubbles, themselves detaching from
microscopic gas pockets forming between the solids. From a detailed study of
the wear tracks, with atomic force and scanning electron microscopy imaging, we
conclude that these microscopic gas pockets originate from a local fracturing
of the surface asperities, possibly enhanced by chemical reactions at the
freshly created surfaces. Our findings will be useful either for preventing
undesired bubble formation or, on the contrary, for "writing with bubbles,"
i.e., creating controlled patterns of microscopic bubbles.


title:
Nonstationary smooth geometric structures for contracting measurable
  cocycles

abstract:
  We implement a differential-geometric approach to normal forms for
contracting measurable cocycles to $\mbox{Diff}^q({\bf R}^n, {\bf 0})$, $q \geq
2$. We obtain resonance polynomial normal forms for the contracting cocycle and
its centralizer, via $C^q$ changes of coordinates. These are interpreted as
nonstationary invariant differential-geometric structures. We also consider the
case of contracted foliations in a manifold, and obtain $C^q$ homogeneous
structures on leaves for an action of the group of subresonance polynomial
diffeomorphisms together with translations.


title:
Alternating direction algorithms for $\ell_0$ regularization in
  compressed sensing

abstract:
  In this paper we propose three iterative greedy algorithms for compressed
sensing, called \emph{iterative alternating direction} (IAD), \emph{normalized
iterative alternating direction} (NIAD) and \emph{alternating direction
pursuit} (ADP), which stem from the iteration steps of alternating direction
method of multiplier (ADMM) for $\ell_0$-regularized least squares
($\ell_0$-LS) and can be considered as the alternating direction versions of
the well-known iterative hard thresholding (IHT), normalized iterative hard
thresholding (NIHT) and hard thresholding pursuit (HTP) respectively. Firstly,
relative to the general iteration steps of ADMM, the proposed algorithms have
no splitting or dual variables in iterations and thus the dependence of the
current approximation on past iterations is direct. Secondly, provable
theoretical guarantees are provided in terms of restricted isometry property,
which is the first theoretical guarantee of ADMM for $\ell_0$-LS to the best of
our knowledge. Finally, they outperform the corresponding IHT, NIHT and HTP
greatly when reconstructing both constant amplitude signals with random signs
(CARS signals) and Gaussian signals.


title: Variety of Singular Quadrics Containing a Projective Curve

abstract:
  We study the variety of rank $\leq k$ quadrics containing a general
projective curve and show that it has the expected dimension in the range
$g-d+r\leq 1$. By considering the loci where this expectation is not true, we
construct new divisor classes in $\overline{\mathcal{M}}_{g,n}$. We use one of
these classes to show that $\overline{\mathcal{M}}_{15,9}$ is of general type.


title: Detection and control of charge states in a quintuple quantum dot

abstract:
  A semiconductor quintuple quantum dot with two charge sensors and an
additional contact to the center dot from an electron reservoir is fabricated
to demonstrate the concept of scalable architecture. This design enables
formation of the five dots as confirmed by measurements of the charge states of
the three nearest dots to the respective charge sensor. The gate performance of
the measured stability diagram is well reproduced by a capacitance model.These
results provide an important step towards realizing controllable large scale
multiple quantum dot systems.


title:
A Singularly Perturbed Boundary Value Problems with Fractional Powers of
  Elliptic Operators

abstract:
  A boundary value problem for a fractional power $0 < \varepsilon < 1$ of the
second-order elliptic operator is considered. The boundary value problem is
singularly perturbed when $\varepsilon \rightarrow 0$. It is solved numerically
using a time-dependent problem for a pseudo-parabolic equation. For the
auxiliary Cauchy problem, the standard two-level schemes with weights are
applied. The numerical results are presented for a model two-dimen\-sional
boundary value problem with a fractional power of an elliptic operator. Our
work focuses on the solution of the boundary value problem with $0 <
\varepsilon \ll 1$.


title:
The Artificial Mind's Eye: Resisting Adversarials for Convolutional
  Neural Networks using Internal Projection

abstract:
  We introduce a novel artificial neural network architecture that integrates
robustness to adversarial input in the network structure. The main idea of our
approach is to force the network to make predictions on what the given instance
of the class under consideration would look like and subsequently test those
predictions. By forcing the network to redraw the relevant parts of the image
and subsequently comparing this new image to the original, we are having the
network give a "proof" of the presence of the object.


title: Conway's groupoid and its relatives

abstract:
  In 1997, John Conway constructed a $6$-fold transitive subset $M_{13}$ of
permutations on a set of size $13$ for which the subset fixing any given point
was isomorphic to the Mathieu group $M_{12}$. The construction was via a
"moving-counter puzzle" on the projective plane ${\rm PG}(2,3)$. We discuss
consequences and generalisations of Conway's construction. In particular we
explore how various designs and hypergraphs can be used instead of ${\rm
PG}(2,3)$ to obtain interesting analogues of $M_{13}$; we refer to these
analogues as Conway groupoids. A number of open questions are presented.


title: Lipschitz slices versus linear slices in Banach spaces

abstract:
  The aim of this note is study the topology generated by Lipschitz slices in
the unit sphere of a Banach space. We prove that the above topology agrees with
the weak topology in the unit sphere and, as a consequence, we obtain Lipschitz
characterizations of classical linear topics in Banach spaces, as Radon-Nikodym
property, convex point of continuity property and strong regularity, which
shows that the above classical linear properties only depend on the natural
uniformity in the Banach space given by the metric and the linear structure.


title:
Dynamics of compressional Mach cones in a strongly coupled complex
  plasma

abstract:
  Using a Generalised-Hydrodynamic (GH) fluid model we study the influence of
strong coupling induced modification of the fluid compressibility on the
dynamics of compressional Mach cones in a dusty plasma medium. A significant
structural change of lateral wakes for a given Mach number and Epstein drag
force is found in the strongly coupled regime. With the increase of fluid
compressibility, the peak amplitude of the normalised perturbed dust density
first increases and then decreases monotonically after reaching its maximum
value. It is also noticed that the opening angle of the cone structure
decreases with the increase of the compressibility of the medium and the arm of
the Mach cone breaks up into small structures in the velocity vector profile
when the coupling between the dust particles increases.


title:
A climate network-based index to discriminate different types of El
  Ni\~no and La Ni\~na

abstract:
  El Ni\~no exhibits distinct Eastern Pacific (EP) and Central Pacific (CP)
types which are commonly, but not always consistently, distinguished from each
other by different signatures in equatorial climate variability. Here, we
propose an index based on evolving climate networks to objectively discriminate
between both flavors by utilizing a scalar-valued evolving climate network
measure that quantifies spatial localization and dispersion in El Ni\~no's
associated teleconnections. Our index displays a sharp peak (high localization)
during EP events, whereas during CP events (larger dispersion) it remains close
to the baseline observed during normal periods. In contrast to previous
classification schemes, our approach specifically account for El Ni\~no's
global impacts. We confirm recent El Ni\~no classifications for the years 1951
to 2014 and assign types to those cases were former works yielded ambiguous
results. Ultimately, we study La Ni\~na episodes and demonstrate that our index
provides a similar discrimination into two types.


title: Quantum simulations and many-body physics with light

abstract:
  In this review we discuss the works in the area of quantum simulation and
many-body physics with light, from the early proposals on equilibrium models to
the more recent works in driven dissipative platforms. We start by describing
the founding works on Jaynes-Cummings-Hubbard model and the corresponding
photon-blockade induced Mott transitions and continue by discussing the
proposals to simulate effective spin models and fractional quantum Hall states
in coupled resonator arrays (CRAs). We also analyze the recent efforts to study
out-of-equilibrium many-body effects using driven CRAs, including the
predictions for photon fermionization and crystallization in driven rings of
CRAs as well as other dynamical and transient phenomena. We try to summarise
some of the relatively recent results predicting exotic phases such as
super-solidity and Majorana like modes and then shift our attention to
developments involving one dimensional nonlinear slow light setups. There the
simulation of strongly correlated phases characterising Tonks-Girardeau gases,
Luttinger liquids, and interacting relativistic fermionic models is described.
We review the major theory results and also briefly outline recent developments
in ongoing experimental efforts involving different platforms in circuit QED,
photonic crystals and nanophotonic fibers interfaced with cold atoms.


title: Bayesian linear regression with Student-t assumptions

abstract:
  As an automatic method of determining model complexity using the training
data alone, Bayesian linear regression provides us a principled way to select
hyperparameters. But one often needs approximation inference if distribution
assumption is beyond Gaussian distribution. In this paper, we propose a
Bayesian linear regression model with Student-t assumptions (BLRS), which can
be inferred exactly. In this framework, both conjugate prior and expectation
maximization (EM) algorithm are generalized. Meanwhile, we prove that the
maximum likelihood solution is equivalent to the standard Bayesian linear
regression with Gaussian assumptions (BLRG). The $q$-EM algorithm for BLRS is
nearly identical to the EM algorithm for BLRG. It is showed that $q$-EM for
BLRS can converge faster than EM for BLRG for the task of predicting online
news popularity.


title: Expected Reachability-Time Games

abstract:
  Probabilistic timed automata are a suitable formalism to model systems with
real-time, nondeterministic and probabilistic behaviour. We study two-player
zero-sum games on such automata where the objective of the game is specified as
the expected time to reach a target. The two players---called player Min and
player Max---compete by proposing timed moves simultaneously and the move with
a shorter delay is performed. The first player attempts to minimise the given
objective while the second tries to maximise the objective. We observe that
these games are not determined, and study decision problems related to
computing the upper and lower values, showing that the problems are decidable
and lie in the complexity class NEXPTIME $\cap$ co-NEXPTIME.


title: A family of $\omega_1$ many topological types of locally finite trees

abstract:
  Two rooted locally finite trees are considered equivalent if both can be
embedded into each other as topological minors by means of tree-order
preserving mappings. By exploiting Nash-William's Theorem, Matthiesen provided
a non-constructive proof of the uncountability of such equivalence classes,
thus answering a question of van der Holst. As an open problem, Matthiesen asks
for a constructive proof of this fact. The purpose of this paper is to provide
one such construction; working solely within ZFC we illustrate a collection of
!1 many topological types of rooted trees. In particular, we also show that
this construction strengthens that of Matthiesen in that it also applies to
free (unrooted) trees of degree two.


title:
On blocks of defect two and one simple module, and Lie algebra structure
  of $HH^1$

abstract:
  Let $k$ be a field of odd prime characteristic $p$. We calculate the Lie
algebra structure of the first Hochschild cohomology of a class of quantum
complete intersections over $k$. As a consequence, we prove that if $B$ is a
defect $2$-block of a finite group algebra $kG$ whose Brauer correspondent $C$
has a unique isomorphism class of simple modules, then a basic algebra of $B$
is a local algebra which can be generated by at most $2\sqrt I$ elements, where
$I$ is the inertial index of $B$, and where we assume that $k$ is a splitting
field for $B$ and $C$.


title: Chaotic dynamics of magnetic domain walls in nanowires

abstract:
  The nonlinear dynamics of a transverse domain wall (TDW) in Permalloy and
Nickel nanostrips with two artificially patterned pinning centers is studied
numerically up to rf frequencies. The phase diagram frequency - driving
amplitude shows a rich variety of dynamical behaviors depending on the material
parameters and the type and shape of pinning centers. We find that T-shaped
traps (antinotches) create a classical double well Duffing potential that leads
to a small chaotic region in the case of Nickel and a large one for Py. In
contrast, the rectangular constrictions (notches) create an exponential
potential that leads to larger chaotic regions interspersed with periodic
windows for both Py and Ni. The influence of temperature manifests itself by
enlarging the chaotic region and activating thermal jumps between the pinning
sites while reducing the depinning field at low frequency in the notched
strips.


title:
Relationships between fluid vorticity, kinetic helicity and magnetic
  field at the small-scale (quiet-network) on the Sun

abstract:
  We derive horizontal fluid motions on the solar surface over large areas
covering the quiet-Sun magnetic network from local correlation tracking of
convective granules imaged in continuum intensity and Doppler velocity by the
Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory
(SDO). From these we calculate horizontal divergence, vertical component of
vorticity, and kinetic helicity of fluid motions. We study the correlations
between fluid divergence and vorticity, and that between vorticity (kinetic
helicity) and magnetic field. We find that the vorticity (kinetic helicity)
around small-scale fields exhibits a hemispherical pattern (in sign) similar to
that followed by the magnetic helicity of large-scale active regions
(containing sunspots). We identify this pattern to be a result of the Coriolis
force acting on supergranular-scale flows (both the outflows and inflows), and
is consistent with earlier studies using local helioseismology. Further, we
show that the magnetic fields cause transfer of vorticity from supergranular
inflow regions to outflow regions, and that they tend to suppress the vortical
motions around them when magnetic flux densities exceed about 300 G (HMI). We
also show that such action of magnetic fields leads to marked changes in the
correlations between fluid divergence and vorticity. These results are
speculated to be of importance to local dynamo action if present, and to the
dynamical evolution of magnetic helicity at the small-scale.


title:
Graphene under the influence of Aharonov-Bohm flux and constant magnetic
  field

abstract:
  Investigation of real two-dimensional systems with Dirac-like electronic
behavior under the influence of magnetic field is challenging and leads to many
interesting physical results. In this paper we study 2D graphene model with a
particular form of magnetic field as a superposition of a homogeneous field and
an Aharonov-Bohm vortex. For this configuration, electronic wave functions and
energy spectrum were obtained and it was shown that the magnetic Aharonov-Bohm
vortex plays the role of a charge impurity. As a demonstration of vacuum
properties of the system, vacuum current, as well as an electric current, is
calculated and their representation for particular limiting cases of magnetic
field is obtained.


title:
The leading twist light-cone distribution amplitudes for the S-wave and
  P-wave Bc mesons

abstract:
  The light-cone distribution amplitudes (LCDAs) serve as important
non-perturbative inputs for the study of hard exclusive processes. In this
paper, we calculate ten LCDAs at twist-2 for the S-wave and P-wave $B_c$ mesons
up to the next-to-leading order (NLO) of the strong coupling $\alpha_s$ and
leading order of the velocity expansion. Each one of these ten LCDAs is
expressed as a product of a perturbatively calculable distribution and a
universal NRQCD matrix-element. By use of the spin symmetry, only two NRQCD
matrix-elements will be involved. The reduction of the number of
non-perturbative inputs will improve the predictive power of collinear
factorization.


title: Interior regularity for fractional systems

abstract:
  We study the regularity of solutions of elliptic fractional systems of order
2s, $s \in (0, 1)$, where the right hand side f depends on a nonlocal gradient
and has the same scaling properties as the nonlocal operator. Under some
structural conditions on the system we prove interior H\"older estimates in the
spirit of [1]. Our results are stable in s allowing us to recover the classic
results for elliptic systems due to S. Hildebrandt and K. Widman [6] and M.
Wiegner [9].


title:
Iterative computational identification of a spacewise dependent the
  source in a parabolic equations

abstract:
  Coefficient inverse problems related to identifying the right-hand side of an
equation with use of additional information is of interest among inverse
problems for partial differential equations. When considering non-stationary
problems, tasks of recovering the dependence of the right-hand side on time and
spatial variables can be treated as independent. These tasks relate to a class
of linear inverse problems, which sufficiently simplifies their study. This
work is devoted to a finding the dependence of right-hand side of
multidimensional parabolic equation on spatial variables using additional
observations of the solution at the final point of time - the final
overdetermination. More general problems are associated with some integral
observation of the solution on time - the integral overdetermination. The first
method of numerical solution of inverse problems is based on iterative solution
of boundary value problem for time derivative with non-local acceleration. The
second method is based on the known approach with iterative refinement of
desired dependence of the right-hand side on spacial variables. Capabilities of
proposed methods are illustrated by numerical examples for model
two-dimensional problem of identifying the right-hand side of a parabolic
equation. The standard finite-element approximation on space is used, the time
discretization is based on fully implicit two-level schemes.


title:
Brightness variation distributions among main belt asteroids from sparse
  light curve sampling with Pan-STARRS 1

abstract:
  The rotational state of asteroids is controlled by various physical
mechanisms including collisions, internal damping and the
Yarkovsky-O'Keefe-Radzievskii-Paddack (YORP) effect. We have analysed the
changes in magnitude between consecutive detections of approximately 60,000
asteroids measured by the PanSTARRS 1 survey during its first 18 months of
operations. We have attempted to explain the derived brightness changes
physically and through the application of a simple model. We have found a
tendency toward smaller magnitude variations with decreasing diameter for
objects of 1 < D < 8 km. Assuming the shape distribution of objects in this
size range to be independent of size and composition our model suggests a
population with average axial ratios 1 : 0.85 \pm 0.13 : 0.71 \pm 0.13, with
larger objects more likely to have spin axes perpendicular to the orbital
plane.


title:
Theoretical study of head-on collision of dust acoustic solitary waves
  in a strongly coupled complex plasma

abstract:
  We investigate the propagation characteristics of two counter propagating
dust acoustic solitary waves (DASWs) undergoing a head-on collision, in the
presence of strong coupling between micron sized charged dust particles in a
complex plasma. A coupled set of nonlinear dynamical equations describing the
evolution of the two DASWs using the extended Poincar\'e-Lighthill-Kuo
perturbation technique is derived. The nature and extent of post collision
phase-shifts of these solitary waves are studied over a wide range of dusty
plasma parameters in a strongly and a weakly coupled medium. We find a
significant change in the nature and amount of phase delay in the strongly
coupled regime as compared to a weakly coupled regime. The phase shift is seen
to change its sign beyond a threshold value of compressibility of the medium
for a given set of dusty plasma parameters.


title:
Complex reflection groups, logarithmic connections and bi-flat
  F-manifolds

abstract:
  We show that bi-flat $F$-manifolds can be interpreted as natural geometrical
structures encoding the almost duality for Frobenius manifolds without metric.
Using this framework, we extend Dubrovin's duality between orbit spaces of
Coxeter groups and Veselov's $\vee$-systems, to the orbit spaces of exceptional
well-generated complex reflection groups of rank $2$ and $3$. On the Veselov's
$\vee$-systems side, we provide a generalization of the notion of
$\vee$-systems that gives rise to a dual connection which coincides with a
Dunkl-Kohno-type connection associated with such groups. In particular, this
allows us to treat on the same ground several different examples including
Coxeter and Shephard groups. Remarkably, as a byproduct of our results, we
prove that in some examples basic flat invariants are not uniquely defined. As
far as we know, such a phenomenon has never been pointed out before.


title: Limits of noise and confusion in the MWA GLEAM year 1 survey

abstract:
  The GaLactic and Extragalactic All-sky MWA survey (GLEAM) is a new relatively
low resolution, contiguous 72-231 MHz survey of the entire sky south of
declination +25 deg. In this paper, we outline one approach to determine the
relative contribution of system noise, classical confusion and sidelobe
confusion in GLEAM images. An understanding of the noise and confusion
properties of GLEAM is essential if we are to fully exploit GLEAM data and
improve the design of future low-frequency surveys. Our early results indicate
that sidelobe confusion dominates over the entire frequency range, implying
that enhancements in data processing have the potential to further reduce the
noise.


title: Cospectral digraphs from locally line digraphs

abstract:
  A digraph $\G=(V,E)$ is a line digraph when every pair of vertices $u,v\in V$
have either equal or disjoint in-neighborhoods. When this condition only
applies for vertices in a given subset (with at least two elements), we say
that $\G$ is a locally line digraph. In this paper we give a new method to
obtain a digraph $\G'$ cospectral with a given locally line digraph $\G$ with
diameter $D$, where the diameter $D'$ of $\G'$ is in the interval $[D-1,D+1]$.
In particular, when the method is applied to De Bruijn or Kautz digraphs, we
obtain cospectral digraphs with the same algebraic properties that characterize
the formers.


title: Kinetic properties of fractal media

abstract:
  Kinetic processes in fractal stellar media are analysed in terms of the
approach developed in our earlier paper (Chumak \& Rastorguev, 2015) involving
a generalization of the nearest neighbour and random force distributions to
fractal media. Diffusion is investigated in the approximation of
scale-dependent conditional density based on an analysis of the solutions of
the corresponding Langevin equations. It is shown that kinetic parameters (time
scales, coefficients of dynamic friction, diffusion, etc.) for fractal stellar
media can differ significantly both qualitatively and quantitatively from the
corresponding parameters for a quasi-uniform random media with limited
fluctuations. The most important difference is that in the fractal case kinetic
parameters depend on spatial scale length and fractal dimension of the medium
studied. A generalized kinetic equation for stellar media (fundamental equation
of stellar dynamics) is derived in the Fokker-Planck approximation with the
allowance for the fractal properties of the spatial stellar density
distribution. Also derived are its limit forms that can be used to describe
small departures of fractal gravitating medium from equilibrium.


title:
Non-Perturbative Four-Point Scattering from First-Quantized Relativistic
  JWKB

abstract:
  We apply the quantum mechanical (first-quantized) JWKB approximation to a
two-body path integral describing the near-forward scattering of two
relativistic, heavy, non-identical, scalar particles in $D$ spacetime
dimensions. In contrast to the loop expansion, in $D = 4$ this gives a
strong-coupling expansion, and in $D = 3$ a non-perturbative weak-coupling
expansion. When the interaction is mediated by massless quanta with spin $N$,
we obtain explicit, relativistic results for the scattering amplitude when $N =
0$, $1$ and $2$. In $D = 4$ we find a Regge trajectory function that agrees
with the usual quantum mechanical spectrum. We also find an exponentiated
infrared divergence that becomes a pure phase factor when the Mandelstam
invariants $s$ and $t$ are inside of the physical scattering region. In $D = 3$
we find a singularity whose position along the $s$ axis is dependent on $t$.
When the interaction is mediated by a heavy scalar with mass $M$, in $D = 3$ we
find an all-order scattering amplitude where the multi-mass branch points $t =
(L + 1)^{2}M^{2}$ appear as Regge poles.


title:
Delta divergence: A novel decision cognizant measure of classifier
  incongruence

abstract:
  Disagreement between two classifiers regarding the class membership of an
observation in pattern recognition can be indicative of an anomaly and its
nuance. As in general classifiers base their decision on class aposteriori
probabilities, the most natural approach to detecting classifier incongruence
is to use divergence. However, existing divergences are not particularly
suitable to gauge classifier incongruence. In this paper, we postulate the
properties that a divergence measure should satisfy and propose a novel
divergence measure, referred to as Delta divergence. In contrast to existing
measures, it is decision cognizant. The focus in Delta divergence on the
dominant hypotheses has a clutter reducing property, the significance of which
grows with increasing number of classes. The proposed measure satisfies other
important properties such as symmetry, and independence of classifier
confidence. The relationship of the proposed divergence to some baseline
measures is demonstrated experimentally, showing its superiority.


abstract:
  Weighted Castelnuovo-Mumford Regularity and Weighted Global GenerationWe
introduce and study a notion of Castelnuovo-Mumford regularity suitable for
weighted projective spaces.


title: Experimental quantum forgery of quantum optical money

abstract:
  Unknown quantum information cannot be perfectly copied (cloned). This
statement is the bedrock of quantum technologies and quantum cryptography,
including the seminal scheme of Wiesner's quantum money, which was the first
quantum-cryptographic proposal. Surprisingly, to our knowledge, quantum money
has not been tested experimentally yet. Here, we experimentally revisit the
Wiesner idea, assuming a banknote to be an image encoded in the polarization
states of single photons. We demonstrate that it is possible to use quantum
states to prepare a banknote that cannot be ideally copied without making the
owner aware of only unauthorized actions. We provide the security conditions
for quantum money by investigating the physically-achievable limits on the
fidelity of 1-to-2 copying of arbitrary sequences of qubits. These results can
be applied as a security measure in quantum digital right management.


title:
Enhanced Circuit Densities in Epitaxially Defined FinFETs (EDFinFETs)
  over FinFETs

abstract:
  FinFET technology is prone to suffer from Line Edge Roughness (LER) based VT
variation with scaling. To address this, we proposed an Epitaxially Defined
(ED) FinFET (EDFinFET) as an alternate to FinFET architecture for 10 nm node
and beyond. We showed by statistical simulations that EDFinFET reduces LER
based VT variability by 90% and overall variability by 59%. However, EDFinFET
consists of wider fins as the fin widths are not constrained by electrostatics
and variability (cf. FinFETs have fin width ~ LG/3 where LG is gate-length).
This indicates that EDFinFET based circuits may be less dense. In this study we
show that wide fins enable taller fin heights. The ability to engineer multiple
STI levels on tall fins enables different transistor widths (i.e. various W/Ls
e.g. 1-10) in a single fin. This capability ensures that even though individual
EDFinFET devices have ~2x larger footprints than FinFETs, EDFinFET may produce
equal or higher circuit density for basic building blocks like inverters or
NAND gates for W/Ls of 2 and higher.


title:
Direct observation of magnetization dynamics generated by nano-contact
  spin-torque vortex oscillators

abstract:
  Time-resolved scanning Kerr microscopy has been used to directly image the
magnetization dynamics of nano-contact (NC) spin-torque vortex oscillators
(STVOs) when phase-locked to an injected microwave (RF) current. The Kerr
images reveal free layer magnetization dynamics that extend outside the NC
footprint, where they cannot be detected electrically, but which are crucial to
phase-lock STVOs that share common magnetic layers. For a single NC, dynamics
were observed not only when the STVO frequency was fully locked to that of the
RF current, but also for a partially locked state characterized by periodic
changes in the core trajectory at the RF frequency. For a pair of NCs, images
reveal the spatial character of dynamics that electrical measurements show to
have enhanced amplitude and reduced linewidth. Insight gained from these images
may improve understanding of the conditions required for mutual phase-locking
of multiple STVOs, and hence enhanced microwave power emission.


title: A new study of $^{10}$B(p,$\alpha$)$^{7}$Be reaction at low energies

abstract:
  The $^{10}$B(p,$\alpha$)$^{7}$Be reaction is of great interest since it has
many applications in different fields of research such as nuclear astrophysics,
nuclear physics, and models of new reactors for clean energy generation. This
reaction has been studied at the AN2000 accelerator of the INFN National
Laboratories of Legnaro (LNL). The total cross section has been measured in a
wide energy range (250 $-$ 1182 keV) by using the activation method. The decays
of the $^7$Be nuclei produced by the reaction were measured at the low counting
facility of LNL by using two fully shielded high-purity germanium detectors.
The present dataset shows a large discrepancy with respect to one of the
previous data at the same energies and reduces the total uncertainty to the
level of 6\%. An R-matrix calculation has been performed on the present data
using the parameters from previous Trojan Horse measurements for the 10 and 500
keV resonances. The present data do not lay on the R-matrix fit in one point
suggesting the existence of a $^{11}$C level not observed yet. Further nuclear
investigations are needed to confirm this hypothesis.


title: A 3D Spatial Fluid Model for Wireless Networks

abstract:
  In this article we develop a three dimensional (3D) analytical model of
wireless networks. We establish an analytical expression of the SINR (Signal to
Interference plus Noise Ratio) of user equipments (UE), by using a 3D fluid
model approach of the network. This model enables to evaluate in a simple way
the cumulative distribution function of the SINR, and therefore the
performance, the quality of service and the coverage of wireless networks, with
a high accuracy. The use of this 3D wireless network model, instead of a
standard two-dimensional one, in order to analyze wireless networks, is
particularly interesting. Indeed, this 3D model enables to establish more
accurate performance and quality of services results than a 2D one.


title:
Deformation quantisation for unshifted symplectic structures on derived
  Artin stacks

abstract:
  We prove that every $0$-shifted symplectic structure on a derived Artin
$n$-stack admits a curved $A_{\infty}$ deformation quantisation. The classical
method of quantising smooth varieties via quantisations of affine space does
not apply in this setting, so we develop a new approach. We construct a map
from DQ algebroid quantisations of unshifted symplectic structures on a derived
Artin $n$-stack to power series in de Rham cohomology, depending only on a
choice of Drinfeld associator. This gives an equivalence between even power
series and certain involutive quantisations, which yield anti-involutive curved
$A_{\infty}$ deformations of the dg category of perfect complexes. In
particular, there is a canonical quantisation associated to every symplectic
structure on such a stack, which agrees for smooth varieties with the
Kontsevich--Tamarkin quantisation for even associators.


title: Variational existence theory for hydroelastic solitary waves

abstract:
  This paper presents an existence theory for solitary waves at the interface
between a thin ice sheet (modelled using the Cosserat theory of hyperelastic
shells) and an ideal fluid (of finite depth and in irrotational motion) for
sufficiently large values of a dimensionless parameter $\gamma$. We establish
the existence of a minimiser of the wave energy ${\mathcal E}$ subject to the
constraint ${\mathcal I}=2\mu$, where ${\mathcal I}$ is the horizontal impulse
and $0< \mu \ll 1$, and show that the solitary waves detected by our
variational method converge (after an appropriate rescaling) to solutions of he
nonlinear Schr\"{o}dinger equation with cubic focussing nonlinearity as $\mu
\downarrow 0$.


title: Quantum key distribution protocols with slow basis choice

abstract:
  Many quantum key distribution (QKD) protocols require random choice of
measurement basis for each pulse or each train of pulses. In some QKD
protocols, such as the Round-Robin Differential Phase Shift (RRDPS) QKD
protocol, this requirement is a bit challenging as randomly choosing hundreds
of settings for every, say, 100 pulses may be too fast with current
technologies. In this paper, we solve this issue by proving the security of QKD
protocols with slow basis choice without compromising the secret key rate. We
also show that the random choice of the bases for the state preparation can be
made slow if the signals do not leak any information on the basis. Examples of
QKD protocols that our technique can apply include the RRDPS protocol and
BB84-type protocols, and our technique relaxes demands for the implementation
of QKD systems.


title:
Bose-Einstein correlations and $\mathbf{v_{2n}}$ and $\mathbf{v_{2n-1}}$
  in hadron and nucleus collisions

abstract:
  We show that Bose-Einstein correlations of identical particles in hadron and
nucleus high energy collisions, lead to long range rapidity correlations in the
azimuthal angle. These correlations are inherent features of the CGC/saturation
approach, however, their origin is more general than this approach. In
framework of the proposed technique both even and odd $v_n$ occur naturally,
independent of the type of target and projectile. We are of the opinion that it
is premature to conclude that the appearance of azimuthal correlations are due
to the hydrodynamical behaviour of the quark-gluon plasma.


title:
Super-harmonic injection locking of nano-contact spin-torque vortex
  oscillators

abstract:
  Super-harmonic injection locking of single nano-contact (NC) spin-torque
vortex oscillators (STVOs) subject to a small microwave current has been
explored. Frequency locking was observed up to the fourth harmonic of the STVO
fundamental frequency $f_{0}$ in microwave magneto-electronic measurements. The
large frequency tunability of the STVO with respect to $f_{0}$ allowed the
device to be locked to multiple sub-harmonics of the microwave frequency
$f_{RF}$, or to the same sub-harmonic over a wide range of $f_{RF}$ by tuning
the DC current. In general, analysis of the locking range, linewidth, and
amplitude showed that the locking efficiency decreased as the harmonic number
increased, as expected for harmonic synchronization of a non-linear oscillator.
Time-resolved scanning Kerr microscopy (TRSKM) revealed significant differences
in the spatial character of the magnetization dynamics of states locked to the
fundamental and harmonic frequencies, suggesting significant differences in the
core trajectories within the same device. Super-harmonic injection locking of a
NC-STVO may open up possibilities for devices such as nanoscale frequency
dividers, while differences in the core trajectory may allow mutual
synchronisation to be achieved in multi-oscillator networks by tuning the
spatial character of the dynamics within shared magnetic layers.


title: On Euler's formulae for double zeta values

abstract:
  In 1776, L. Euler proposed three methods, called prima methodus, secunda
methodus and tertia methodus, to calculate formulae for double zeta values.
However strictly speaking, his last two methods are mathematically incomplete
and require more precise reformulation and more sophisticated arguments for
their justification. In this paper, we reformulate his formulae, give their
rigorous proofs and also clarify that the formulae can be derived from the
extended double shuffle relations.


title:
Evidence for exclusive gamma gamma to W+W- production and constraints on
  anomalous quartic gauge couplings in pp collisions at sqrt(s) = 7 and 8 TeV

abstract:
  A search for exclusive or quasi-exclusive gamma gamma to W+W- production, via
pp to p(*) W+W- p(*) to p(*) mu+/- e-/+ at sqrt(s) = 8 TeV, is reported using
data corresponding to an integrated luminosity of 19.7 inverse femtobarns.
Events are selected by requiring the presence of an electron-muon pair with
large transverse momentum pt(mu+/- e-/+) > 30 GeV, and no associated charged
particles detected from the same vertex. The 8 TeV results are combined with
the previous 7 TeV results (obtained for 5.05 inverse femtobarns of data). In
the signal region, 13 (2) events are observed over an expected background of
3.9 +/- 0.6 (0.84 +/-0.15) events for 8 (7) TeV, resulting in a combined excess
of 3.4 standard deviations over the background-only hypothesis. The observed
yields and kinematic distributions are compatible with the standard model
prediction for exclusive and quasi-exclusive gamma gamma to W+W- production.
Upper limits on the anomalous quartic gauge coupling operators a[W;0,C]
(dimension-6) and f[M0,1,2,3] (dimension-8), the most stringent to date, are
derived from the measured dilepton transverse momentum spectrum.


title: PRI: Privacy Preserving Inspection of Encrypted Network Traffic

abstract:
  Traffic inspection is a fundamental building block of many security solutions
today. For example, to prevent the leakage or exfiltration of confidential
insider information, as well as to block malicious traffic from entering the
network, most enterprises today operate intrusion detection and prevention
systems that inspect traffic. However, the state-of-the-art inspection systems
do not reflect well the interests of the different involved autonomous roles.
For example, employees in an enterprise, or a company outsourcing its network
management to a specialized third party, may require that their traffic remains
confidential, even from the system administrator. Moreover, the rules used by
the intrusion detection system, or more generally the configuration of an
online or offline anomaly detection engine, may be provided by a third party,
e.g., a security research firm, and can hence constitute a critical business
asset which should be kept confidential. Today, it is often believed that
accounting for these additional requirements is impossible, as they contradict
efficiency and effectiveness. We in this paper explore a novel approach, called
Privacy Preserving Inspection (PRI), which provides a solution to this problem,
by preserving privacy of traffic inspection and confidentiality of inspection
rules and configurations, and e.g., also supports the flexible installation of
additional Data Leak Prevention (DLP) rules specific to the company.


title:
Epidemic risk from friendship network data: an equivalence with a
  non-uniform sampling of contact networks

abstract:
  Contacts between individuals play an important role in determining how
infectious diseases spread. Various methods to gather data on such contacts
co-exist, from surveys to wearable sensors. Comparisons of data obtained by
different methods in the same context are however scarce, in particular with
respect to their use in data-driven models of spreading processes. Here, we use
a combined data set describing contacts registered by sensors and friendship
relations in the same population to address this issue in a case study. We
investigate if the use of the friendship network is equivalent to a sampling
procedure performed on the sensor contact network with respect to the outcome
of simulations of spreading processes: such an equivalence might indeed give
hints on ways to compensate for the incompleteness of contact data deduced from
surveys. We show that this is indeed the case for these data, for a
specifically designed sampling procedure, in which respondents report their
neighbors with a probability depending on their contact time. We study the
impact of this specific sampling procedure on several data sets, discuss
limitations of our approach and its possible applications in the use of data
sets of various origins in data-driven simulations of epidemic processes.


title: Effect of polarization force on the Mach cones in a complex plasma

abstract:
  We report the modifications of compressional Mach cone propagation
characteristics due to \textcolor{black}{the} polarization force acting on
micron size dust particles embedded in a non-uniform plasma. We solve the
hydrodynamic fluid equations for highly charged dust particles to investigate
the Mach cone by incorporating the polarization force in the momentum equation
and observe the structural change on lateral wakes at different polarization
force for a given Mach number and Epstein drag force. We also notice that the
maximum amplitude of normalized dust density perturbation decreases with the
increase of polarization interaction when the other parameters remain constant.


title: Extended First Law for Entanglement Entropy in Lovelock Gravity

abstract:
  The first law for the holographic entanglement entropy of spheres in a
boundary CFT with a bulk Lovelock dual is extended to include variations of the
bulk Lovelock coupling constants. Such variations in the bulk correspond to
perturbations within a family of boundary CFTs. The new contribution to the
first law is found to be the product of the variation $\delta a$ of the A-type
trace anomaly coefficient for even dimensional CFTs, or more generally its
extension $\delta a^*$ to include odd dimensional boundaries, times the ratio
$S/a^*$. Since $a^*$ is a measure of the number of degrees of freedom $N$ per
unit volume of the boundary CFT, this new term has the form $\mu\delta N$,
where the chemical potential $\mu$ is given by the entanglement entropy per
degree of freedom.


title:
The shrinking Sun: a systematic error in local correlation tracking of
  solar granulation

abstract:
  Context. Local correlation tracking of granulation (LCT) is an important
method for measuring horizontal flows in the photosphere. This method exhibits
a systematic error that looks like a flow converging towards disk center, also
known as the shrinking-Sun effect.
  Aims. We aim at studying the nature of the shrinking-Sun effect for continuum
intensity data and at deriving a simple model that can explain its origin.
  Methods. We derived LCT flow maps by running the local correlation tracking
code FLCT on tracked and remapped continuum intensity maps provided by the
Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory.
We also computed flow maps from synthetic continuum images generated from
STAGGER code simulations of solar surface convection. We investigated the
origin of the shrinking-Sun effect by generating an average granule from
synthetic data from the simulations.
  Results. The LCT flow maps derived from HMI and from the simulations exhibit
a shrinking-Sun effect of comparable magnitude. The origin of this effect is
related to the apparent asymmetry of granulation originating from radiative
transfer effects when observing with a viewing angle inclined from vertical.
This causes, in combination with the expansion of the granules, an apparent
motion towards disk center.


title: 3-dimensional Griess algebras and Miyamoto involutions

abstract:
  We consider a series of VOAs generated by 3-dimensional Griess algebras. We
will show that these VOAs can be characterized by their 3-dimensional Griess
algebras and their structures are uniquely determined. As an application, we
will determine the groups generated by the Miyamoto involutions associated to
Virasoro vectors of our VOAs.


title:
On Dynamic Job Ordering and Slot Configurations for Minimizing the
  Makespan Of Multiple MapReduce Jobs

abstract:
  MapReduce is a popular parallel computing paradigm for Big Data processing in
clusters and data centers. It is observed that different job execution orders
and MapReduce slot configurations for a MapReduce workload have significantly
different performance with regarding to the makespan, total completion time,
system utilization and other performance metrics. There are quite a few
algorithms on minimizing makespan of multiple MapReduce jobs. However, these
algorithms are heuristic or suboptimal. The best known algorithm for minimizing
the makespan is 3-approximation by applying Johnson rule. In this paper, we
propose an approach called UAAS algorithm to meet the conditions of classical
Johnson model. Then we can still use Johnson model for an optimal solution. We
explain how to adapt to Johnson model and provide a few key features of our
proposed method.


title:
Ab initio study of the strain dependence of thermopower in
  electron-doped SrTiO$_3$

abstract:
  In this paper we explore the different mechanisms that affect the thermopower
of a band insulating perovskite (in this case, SrTiO$_3$) when subject to
strain (both compressive or tensile). We analyze the high temperature, entropy
dominated limit and the lower temperature, energy-transport regime. We observe
that the effect of strain in the high-temperature Seebeck coefficient is small
at the concentration levels of interest for thermoelectric applications.
However, the effective mass changes substantially with strain, which produces
an opposite effect to that of the degeneracy-breakups produced by strain. In
particular, we find that the thermopower can be enhanced by applying tensile
strain in the adequate regime. We conclude that the detrimental effect of
strain in thermopower due to band splitting is a minor effect that will not
hamper the optimization of the thermoelectric properties of oxides with
t$_{2g}$-active bands by applying strain.


title:
Probing the Intra-Component Correlations within Fisher Vector for
  Material Classification

abstract:
  Fisher vector (FV) has become a popular image representation. One notable
underlying assumption of the FV framework is that local descriptors are well
decorrelated within each cluster so that the covariance matrix for each
Gaussian can be simplified to be diagonal. Though the FV usually relies on the
Principal Component Analysis (PCA) to decorrelate local features, the PCA is
applied to the entire training data and hence it only diagonalizes the
\textit{universal} covariance matrix, rather than those w.r.t. the local
components. As a result, the local decorrelation assumption is usually not
supported in practice.
  To relax this assumption, this paper proposes a completed model of the Fisher
vector, which is termed as the Completed Fisher vector (CFV). The CFV is a more
general framework of the FV, since it encodes not only the variances but also
the correlations of the whitened local descriptors. The CFV thus leads to
improved discriminative power. We take the task of material categorization as
an example and experimentally show that: 1) the CFV outperforms the FV under
all parameter settings; 2) the CFV is robust to the changes in the number of
components in the mixture; 3) even with a relatively small visual vocabulary
the CFV still works well on two challenging datasets.


title: Public key cryptography based on some extensions of group

abstract:
  Bogopolski, Martino and Ventura in [BMV10] introduced a general criteria to
construct groups extensions with unsolvable conjugacy problem using short exact
sequences. We prove that such extensions have always solvable word problem.
This makes the proposed construction a systematic way to obtain finitely
presented groups with solvable word problem and unsolvable conjugacy problem.
It is believed that such groups are important in cryptography. For this, and as
an example, we provide an explicit construction of an extension of Thompson
group F and we propose it as a base for a public key cryptography protocol.


title: 3-Leibniz bialgebras (3-Lie bialgebras)

abstract:
  The aim of this paper is to extend the notion of bialgebra for Leibniz
algebras (and Lie algebras) to $3$-Leibniz algebras (and $3$-Lie algebras) by
use of the cohomology complex of $3$-Leibniz algebras. Also, some theorems
about Leibniz bialgebras are extended and proved in the case of $3$-Leibniz
bialgebras ($3$-Lie bialgebras). Moreover, a new theorem on the correspondence
between $3$-Leibniz bialgebra and its associated Leibniz bialgebra is proved.
Finally, some examples are discussed in detail.


title: The detectability of mm-wave molecular rotational transitions

abstract:
  Elaborating on a formalism that was first expressed some 40 years ago, we
consider the brightness of low-lying mm-wave rotational lines of strongly polar
molecules at the threshold of detectability. We derive a simple expression
relating the brightness to the line of sight integral of the product of the
total gas and molecular number densities and a suitably-defined
temperature-dependent excitation rate into the upper level of the transition.
Detectability of a line is contingent only on the ability of a molecule to
channel enough of the ambient thermal energy into the line and the excitation
can be computed in bulk by summing over rates without solving the multi-level
rate equations or computing optical depths and excitation temperatures. Results
for \hcop, HNC and CS are compared with escape-probability solutions of the
rate equations using closed-form expressions for the expected range of validity
of our {\it ansatz}, with the result that gas number densities as high as $10^4
\pccc$ or optical depths as high as 100 can be accommodated in some cases. For
densities below a well-defined upper bound, the range of validity of the
discussion can be cast as an upper bound on the line brightness which is 0.3 K
for the J=1-0 lines and 0.8 - 1.7 K for the J=2-1 lines of these species. The
discussion casts new light on interpretation of line brightnesses under
conditions of weak excitation, simplifies derivation of physical parameters and
eliminates the need to construct grids of numerical solutions of the rate
equations.


title:
The decay of the $SU(2)$ Yang-Mills fields on the Schwarzschild black
  hole for spherically symmetric small energy initial data

abstract:
  We prove uniform decay estimates in the entire exterior of the Schwarzschild
black hole for gauge invariant norms on the Yang-Mills fields valued in the Lie
algebra associated to the Lie group $SU(2)$. We assume that the initial data
are spherically symmetric satisfying a certain Ansatz, and have small energy,
which eliminates the stationary solutions which do not decay. In particular,
there don't exist any Coulomb type solutions satisfying this Ansatz. We first
prove a Morawetz type estimate for the Yang-Mills fields within this setting,
using the Yang-Mills equations directly. We then adapt the proof constructed in
previous work by the first author to show local energy decay and uniform decay
of the $L^{\infty}$ norm of the middle components in the entire exterior of the
Schwarzschild black hole, including the event horizon.


title:
Computer model calibration with large non-stationary spatial outputs:
  application to the calibration of a climate model

abstract:
  Bayesian calibration of computer models tunes unknown input parameters by
comparing outputs with observations. For model outputs that are distributed
over space, this becomes computationally expensive because of the output size.
To overcome this challenge, we employ a basis representation of the model
outputs and observations: we match these decompositions to carry out the
calibration efficiently. In the second step, we incorporate the non-stationary
behaviour, in terms of spatial variations of both variance and correlations, in
the calibration. We insert two integrated nested Laplace
approximation-stochastic partial differential equation parameters into the
calibration. A synthetic example and a climate model illustration highlight the
benefits of our approach.


title: Comparison of caloric effects in view of application

abstract:
  In the framework of solid-state cooling technology, four kinds of caloric
effects, magnetocaloric (MC), electrocaloric (EC), barocaloric (BC) and
elastocaloric (eC) effects, are compared in view of environment discussion and
application fields. This field is primarily developed in the intention of
protecting the environment. However, some widely researched caloric materials
do not meet environmental friendly criteria. Currently, new caloric materials
(called "good" material) possessing the properties of friendly environment, low
cost, high caloric performance and practicability (low stress) need to be
found. In view of application, all current caloric effects/materials are
investigated for the common objective of cooling. However, the adapted
application cases for different caloric effects/materials are not considered.
Due to the different stimuli and different intrinsic properties (different
caloric performance for different dimensions) of caloric materials, they can
exhibit unique advantage to different application cases. "Good" caloric
material used for large-scale application is still less and deserve more
search. Purposeful research will save the cost and accelerate the
commercialization.


title:
Heuristic Approximations for Closed Networks: A Case Study in Open-pit
  Mining

abstract:
  We investigate a fundamental model from open-pit mining, which is a cyclic
system consisting of a shovel, traveling loaded, unloading facility, and
traveling back empty. The interaction of these subsystem determines the
capacity of the shovel, which is the fundamental quantity of interest. To
determine this capacity one needs the stationary probability that the shovel is
idle. Because an exact analysis of the performance of the system is out of
reach, besides of simulations there are various approximation algorithms
proposed in the literature which stem from computer science and can be
characterized as general purpose algorithms. We propose for solving the special
problem under mining conditions an extremely simple algorithm. Comparison with
several general purpose algorithms shows that for realistic situations the
special algorithm outperforms the precision of the general purpose algorithms.
This holds even if these general purpose candidates incorporate more details of
the underlying models than our simple algorithm, which works on a strongly
reduced model. The comparison and assessment is done with extensive simulations
on a level of detail which the general purpose algorithms are able to cover.


title: A note on multiplicative functions on progressions to large moduli

abstract:
  Let $f : \mathbf{N} \rightarrow \mathbf{C}$ be a bounded multiplicative
function. Let $a$ be a fixed integer (say $a = 1$). Then $f$ is
well-distributed on the progression $n \equiv a \pmod{q} \subset \{1,\dots,
X\}$, for almost all primes $q \in [Q,2Q]$, for $Q$ as large as $X^{\frac{1}{2}
+ \frac{1}{78} - o(1)}$.


title:
Self-Adaptive Consolidation of Virtual Machines For Energy-Efficiency in
  the Cloud

abstract:
  In virtualized data centers, consolidation of Virtual Machines (VMs) on
minimizing the number of total physical machines (PMs) has been recognized as a
very efficient approach. This paper considers the energy-efficient
consolidation of VMs in a Cloud Data center. Concentrating on CPU-intensive
applications, the objective is to schedule all requests non-preemptively,
subjecting to constraints of PM capacities and running time interval spans,
such that the total energy consumption of all PMs is minimized (called MinTE
for abbreviation). The MinTE problem is NP-complete in general. We propose a
self-adaptive approached called SAVE. The approach makes decisions of the
assignment and migration of VMs by probabilistic processes and is based
exclusively on local information, therefore it is very simple to implement.
Both simulation and real environment test show that our proposed method SAVE
can reduce energy consumption about 30% against VMWare DRS and 10-20% against
EcoCloud on average.


title:
On the numerical quadrature of weakly singular oscillatory integral and
  its fast implementation

abstract:
  In this paper, we present a Clenshaw-Curtis-Filon-type method for the weakly
singular oscillatory integral with Fourier and Hankel kernels. By interpolating
the non-oscillatory and nonsingular part of the integrand at $(N+1)$
Clenshaw-Curtis points, the method can be implemented in $O(N\log N)$
operations. The method requires the accurate computation of modified moments.
We first give a method for the derivation of the recurrence relation for the
modified moments, which can be applied to the derivation of the recurrence
relation for the modified moments corresponding to other type oscillatory
integrals. By using recurrence relation, special functions and classic
quadrature methods, the modified moments can be computed accurately and
efficiently. Then, we present the corresponding error bound in inverse powers
of frequencies $k$ and $\omega$ for the proposed method. Numerical examples are
provided to support the theoretical results and show the efficiency and
accuracy of the method.


title: Enabling Privacy-Preserving GWAS in Heterogeneous Human Populations

abstract:
  The projected increase of genotyping in the clinic and the rise of large
genomic databases has led to the possibility of using patient medical data to
perform genomewide association studies (GWAS) on a larger scale and at a lower
cost than ever before. Due to privacy concerns, however, access to this data is
limited to a few trusted individuals, greatly reducing its impact on biomedical
research. Privacy preserving methods have been suggested as a way of allowing
more people access to this precious data while protecting patients. In
particular, there has been growing interest in applying the concept of
differential privacy to GWAS results. Unfortunately, previous approaches for
performing differentially private GWAS are based on rather simple statistics
that have some major limitations. In particular, they do not correct for
population stratification, a major issue when dealing with the genetically
diverse populations present in modern GWAS. To address this concern we
introduce a novel computational framework for performing GWAS that tailors
ideas from differential privacy to protect private phenotype information, while
at the same time correcting for population stratification. This framework
allows us to produce privacy preserving GWAS results based on two of the most
commonly used GWAS statistics: EIGENSTRAT and linear mixed model (LMM) based
statistics. We test our differentially private statistics, PrivSTRAT and
PrivLMM, on both simulated and real GWAS datasets and find that they are able
to protect privacy while returning meaningful GWAS results.


title:
Radial oscillations of a radiation-supported levitating shell in
  Eddington luminosity neutron stars

abstract:
  In general relativity, it has been shown that radiation-supported atmospheres
exist outside the surface of a radiating spherical body close to a radius where
the gravitational and radiative forces balance each other. We calculate the
frequency of oscillation of the incompressible radial mode of such a thin
atmospheric shell and show that in the optically thin case, this particular
mode is overdamped by radiation drag.


title: Comment on "Testing Planck-Scale Gravity with Accelerators"

abstract:
  We challenge the analysis and conclusions of the paper Phys. Rev. Lett. 109,
141103 (2012) by V. Gharibyan on the tests of Planck-scale gravity with
accelerators. The main objective of the Comment is the observation that the
explored domain of "quantum gravity" parameters is already ruled out
experimentally from, e.g., absence of the vacuum Cherenkov radiation.


title: Phase Transitions and Scaling in Systems Far From Equilibrium

abstract:
  Scaling ideas and renormalization group approaches proved crucial for a deep
understanding and classification of critical phenomena in thermal equilibrium.
Over the past decades, these powerful conceptual and mathematical tools were
extended to continuous phase transitions separating distinct non-equilibrium
stationary states in driven classical and quantum systems. In concordance with
detailed numerical simulations and laboratory experiments, several prominent
dynamical universality classes have emerged that govern large-scale, long-time
scaling properties both near and far from thermal equilibrium. These pertain to
genuine specific critical points as well as entire parameter space regions for
steady states that display generic scale invariance. The exploration of
non-stationary relaxation properties and associated physical aging scaling
constitutes a complementary potent means to characterize cooperative dynamics
in complex out-of-equilibrium systems. This article describes dynamic scaling
features through paradigmatic examples that include near-equilibrium critical
dynamics, driven lattice gases and growing interfaces, correlation-dominated
reaction-diffusion systems, and basic epidemic models.


title: Convergence actions and Specker compactifications

abstract:
  We study locally compact convergence groups, in particular the link between
the convergence property and the Specker compactifications (a genaralization of
the ends) of a group.


title:
One-dimensional phase retrieval with additional interference
  measurements

abstract:
  The one-dimensional phase retrieval problem consists in the recovery of a
complex-valued signal from its Fourier intensity. Due to the well-known
ambiguousness of this problem, the determination of the original signal within
the extensive solution set is challenging and can only be done under suitable a
priori assumption or additional information about the unknown signal. Depending
on the application, one has sometimes access to further interference
measurements between the unknown signal and a reference signal. Beginning with
the reconstruction in the discrete-time setting, we show that each signal can
be uniquely recovered from its Fourier intensity and two further interference
measurements between the unknown signal and a modulation of the signal itself.
Afterwards, we consider the continuous-time problem, where we obtain an
equivalent result. Moreover, the unique recovery of a continuous-time signal
can also be ensured by using interference measurements with a known or an
unknown reference which is unrelated to the unknown signal.


title: Loss-tolerant parity measurement for distant quantum bits

abstract:
  We propose a scheme to measure the parity of two distant qubits, while
ensuring that losses on the quantum channel between them does not destroy
coherences within the parity subspaces. This capability enables deterministic
preparation of highly entangled qubit states whose fidelity is not limited by
the transmission loss. The key observation is that for a probe electromagnetic
field in a particular quantum state, namely a superposition of two coherent
states of opposite phases, the transmission loss stochastically applies a
near-unitary back-action on the probe state. This leads to a parity measurement
protocol where the main effect of the transmission losses is a decrease in the
measurement strength. By repeating the non-destructive (weak) parity
measurement, one achieves a high-fidelity entanglement in spite of a
significant transmission loss.


title:
Quantitative determination of optical and recombination losses in
  thin-film photovoltaic devices based on external quantum efficiency analysis

abstract:
  In developing photovoltaic devices with high efficiencies, quantitative
determination of the carrier loss is crucial. In conventional solar-cell
characterization techniques, however, photocurrent reduction originating from
parasitic light absorption and carrier recombination within the light absorber
cannot be assessed easily. Here, we develop a general analysis scheme in which
the optical and recombination losses in submicron-textured solar cells are
evaluated systematically from external quantum efficiency (EQE) spectra. In
this method, the optical absorption in solar cells is first deduced by imposing
the anti-reflection condition in the calculation of the absorptance spectrum,
and the carrier extraction from the light absorber layer is then modeled by
considering a carrier collection length from the absorber interface. Our
analysis method is appropriate for a wide variety of photovoltaic devices,
including kesterite solar cells [Cu2ZnSnSe4, Cu2ZnSnS4, and Cu2ZnSn(S,Se)4],
zincblende CdTe solar cells, and hybrid perovskite (CH3NH3PbI3) solar cells,
and provides excellent fitting to numerous EQE spectra reported earlier. Based
on the results obtained from our EQE analyses, we discuss the effects of
parasitic absorption and carrier recombination in different types of solar
cells.


title:
Manifold Learning with Contracting Observers for Data-driven Time-series
  Analysis

abstract:
  Analyzing signals arising from dynamical systems typically requires many
modeling assumptions and parameter estimation. In high dimensions, this
modeling is particularly difficult due to the "curse of dimensionality". In
this paper, we propose a method for building an intrinsic representation of
such signals in a purely data-driven manner. First, we apply a manifold
learning technique, diffusion maps, to learn the intrinsic model of the latent
variables of the dynamical system, solely from the measurements. Second, we use
concepts and tools from control theory and build a linear contracting observer
to estimate the latent variables in a sequential manner from new incoming
measurements. The effectiveness of the presented framework is demonstrated by
applying it to a toy problem and to a music analysis application. In these
examples we show that our method reveals the intrinsic variables of the
analyzed dynamical systems.


title:
Enforcing uniqueness in one-dimensional phase retrieval by additional
  signal information in time domain

abstract:
  Considering the ambiguousness of the discrete-time phase retrieval problem to
recover a signal from its Fourier intensities, one can ask the question: what
additional information about the unknown signal do we need to select the
correct solution within the large solution set? Based on a characterization of
the occurring ambiguities, we investigate different a priori conditions in
order to reduce the number of ambiguities or even to receive a unique solution.
Particularly, if we have access to additional magnitudes of the unknown signal
in the time domain, we can show that almost all signals with finite support can
be uniquely recovered. Moreover, we prove that an analogous result can be
obtained by exploiting additional phase information.


title: Long-term Temporal Convolutions for Action Recognition

abstract:
  Typical human actions last several seconds and exhibit characteristic
spatio-temporal structure. Recent methods attempt to capture this structure and
learn action representations with convolutional neural networks. Such
representations, however, are typically learned at the level of a few video
frames failing to model actions at their full temporal extent. In this work we
learn video representations using neural networks with long-term temporal
convolutions (LTC). We demonstrate that LTC-CNN models with increased temporal
extents improve the accuracy of action recognition. We also study the impact of
different low-level representations, such as raw values of video pixels and
optical flow vector fields and demonstrate the importance of high-quality
optical flow estimation for learning accurate action models. We report
state-of-the-art results on two challenging benchmarks for human action
recognition UCF101 (92.7%) and HMDB51 (67.2%).


title:
MyTrackingChoices: Pacifying the Ad-Block War by Enforcing User Privacy
  Preferences

abstract:
  Free content and services on the Web are often supported by ads. However,
with the proliferation of intrusive and privacy-invasive ads, a significant
proportion of users have started to use ad blockers. As existing ad blockers
are radical (they block all ads) and are not designed taking into account their
economic impact, ad-based economic model of the Web is in danger today. In this
paper, we target privacy-sensitive users and provide them with fine-grained
control over tracking. Our working assumption is that some categories of web
pages (for example, related to health, religion, etc.) are more
privacy-sensitive to users than others (education, science, etc.). Therefore,
our proposed approach consists in providing users with an option to specify the
categories of web pages that are privacy-sensitive to them and block trackers
present on such web pages only. As tracking is prevented by blocking network
connections of third-party domains, we avoid not only tracking but also
third-party ads. Since users will continue receiving ads on web pages belonging
to non-sensitive categories, our approach essentially provides a trade-off
between privacy and economy. To test the viability of our solution, we
implemented it as a Google Chrome extension, named MyTrackingChoices (available
on Chrome Web Store). Our real-world experiments with MyTrackingChoices show
that the economic impact of ad blocking exerted by privacy-sensitive users can
be significantly reduced.


title: Spatial Structure and Scaling of Agricultural Networks

abstract:
  Considering agricultural landscapes as networks can provide information about
spatial connectivity relevant for a wide range of applications including
pollination, pest management, and ecology. Global agricultural networks are
well-described by power law rank-size distributions. However, regional analyses
capture only a subset of the total global network. Most analyses are regional.
In this paper, we seek to address the following questions: Does the globally
observed scale-free property of agricultural networks hold over smaller spatial
domains? Can similar properties be observed at kilometer to meter scales? We
analyze 9 intensively cultivated Landsat scenes on 5 continents with a wide
range of vegetation distributions. We find that networks of vegetation fraction
within the domain of each of these Landsat scenes exhibit substantial
variability - but still possess similar scaling properties to the global
distribution of agriculture. We also find similar results using a 39 km2 IKONOS
image. To illustrate an application of spatial network analysis, we show an
example of network disruption. We compare two networks with similar rank-size
distributions that behave differently when nodes are progressively removed. We
suggest that treating agricultural land cover as spatial networks can provide a
straightforward way of characterizing the connectivity of complex spatial
distributions of agriculture across a wide range of landscapes and at spatial
scales relevant for practical agricultural applications.


title: Fluid Models of Parallel Service Systems under FCFS

abstract:
  We study deterministic fluid approximations of parallel service systems
operating under first come first served policy (FCFS). The condition for
complete resource pooling is identified in terms of the system structure and
the customer service times. The static planning linear programming approach
(Harrison and Lopez \cite{harrison-lopez:99}) is used to obtain a maximum
throughput compatibility tree and to show that FCFS using this compatibility
tree is throughput optimal. We investigate matching rates and show by
Hotelling's $T^2$-test and simulation that they are dependent on the service
time distribution.


title:
Do the Contemporary Cubature and Unscented Kalman Filtering Methods
  Outperform Always the Traditional Extended Kalman Filter?

abstract:
  This brief technical note elaborates three well-known state estimators, which
are used extensively in practice. These are the rather old-fashioned extended
Kalman filter (EKF) and the recently-designed cubature Kalman filtering (CKF)
and unscented Kalman filtering (UKF) algorithms. Nowadays, it is commonly
accepted that the contemporary techniques outperform always the traditional EKF
in the accuracy of state estimation because of the higher-order approximation
of the mean of propagated Gaussian density in the time- and measurement-update
steps of the listed filters. However, the present paper specifies this commonly
accepted opinion and shows that despite the mentioned theoretical fact the EKF
may outperform the CKF and UKF methods in the accuracy of state estimation when
the stochastic system under consideration exposes a stiff behavior. That is why
stiff stochastic models are difficult to deal with and require effective state
estimation techniques to be designed yet.


title:
Two-phase anisotropic free boundary problems and applications to the
  Bellman equation in 2D

abstract:
  We prove Lipschitz continuity of solutions to a class of rather general
two-phase anisotropic free boundary problems in 2D and we classify global
solutions. As a consequence, we obtain $C^{2,1}$ regularity of solutions to the
Bellman equation in 2D.


title:
Relativistic origin of slow electron-hole recombination in hybrid halide
  perovskite solar cells

abstract:
  The hybrid perovskite CH3NH3PbI3 (MAPI) exhibits long minority-carrier
lifetimes and diffusion lengths. We show that slow recombination originates
from a spin-split indirect-gap. Large internal electric fields act on
spin-orbit-coupled band extrema, shifting band-edges to inequivalent
wavevectors, making the fundamental gap indirect. From a description of
photoluminescence within the quasiparticle self-consistent GW (QSGW)
approximation for MAPI, CdTe and GaAs, we predict carrier lifetime as a
function of light intensity and temperature. At operating conditions we find
radiative recombination in MAPI is reduced by a factor of more than 350
compared to direct gap behavior. The indirect gap is retained with dynamic
disorder.


title:
Electric-field-induced energy tuning of on-demand entangled-photon
  emission from self-assembled quantum dots

abstract:
  The scalability of quantum dot based non-classical light sources relies on
the control over their dissimilar emission energies. Electric fields offer a
promising route to tune the quantum dot emission energy through the
quantum-confined Stark effect. However, electric fields have been mostly used
for tuning the energy of single-photon emission from quantum dots, while
electrical control over the energy of entangled-photon emission, which is
crucial for building a solid-state quantum repeater using indistinguishable
entangled photons, has not been realized yet. Here, we present a method to
achieve electrical control over the energy of entangled-photon emission from
quantum dots. The device consists of an electrically-tunable quantum diode
integrated onto a piezoactuator. We find that, through application of a
vertical electric field, the critical uniaxial stress used to eliminate the
fine-structure-splitting of quantum dots can be linearly tuned. This allows
realization of a triggered source of energy-tunable entangled-photon emission,
an important step towards a solid-state quantum repeater application.


title: Multiple Fields in Stochastic Inflation

abstract:
  Stochastic effects in multi-field inflationary scenarios are investigated. A
hierarchy of diffusion equations is derived, the solutions of which yield
moments of the numbers of inflationary $e$-folds. Solving the resulting partial
differential equations in multi-dimensional field space is more challenging
than the single-field case. A few tractable examples are discussed, which show
that the number of fields is, in general, a critical parameter. When more than
two fields are present for instance, the probability to explore arbitrarily
large-field regions of the potential, otherwise inaccessible to single-field
dynamics, becomes non-zero. In some configurations, this gives rise to an
infinite mean number of $e$-folds, regardless of the initial conditions.
Another difference with respect to single-field scenarios is that multi-field
stochastic effects can be large even at sub-Planckian energy. This opens
interesting new possibilities for probing quantum effects in inflationary
dynamics, since the moments of the numbers of $e$-folds can be used to
calculate the distribution of primordial density perturbations in the
stochastic-$\delta N$ formalism.


title: A short study of a string on a plane: the energy and the effective mass

abstract:
  We investigate the new special class of the finite string on a plane, after
the reduction from the relativistic $4D$ case. The suggested special form of
the phase space allows to define the extended Galilei group as a group of the
space - time symmetry for the considered system. The definition of the energy
for the studied non-relativistic string through the Cazimir function of this
group is suggested. The concept of the effective mass for the investigated
dynamical system is introduced. The appearance of strong correlations between
the degrees of freedom even on the classical level is discussed.