title:
A Linear-Time Algorithm for the Weighted Paired-Domination Problem on
  Block Graphs

abstract:
  In a graph $G = (V,E)$, a vertex subset $S\subseteq V(G)$ is said to be a
dominating set of $G$ if every vertex not in $S$ is adjacent to a vertex in
$S$. A dominating set $S$ of $G$ is called a paired-dominating set of $G$ if
the induced subgraph $G[S]$ contains a perfect matching. In this paper, we
propose an $O(n+m)$-time algorithm for the weighted paired-domination problem
on block graphs using dynamic programming, which strengthens the results in
[Theoret. Comput. Sci., 410(47--49):5063--5071, 2009] and [J. Comb. Optim.,
19(4):457--470, 2010]. Moreover, the algorithm can be completed in $O(n)$ time
if the block-cut-vertex structure of $G$ is given.


title: Families of Subsets Without a Given Poset in the Interval Chains

abstract:
  For two posets $P$ and $Q$, we say $Q$ is $P$-free if there does not exist
any order-preserving injection from $P$ to $Q$. The speical case for $Q$ being
the Boolean lattice $B_n$ is well-studied, and the optiamal value is denoted as
$\lanp$. Let us define $\La(Q,P)$ to be the largest size of any $P$-free
subposet of $Q$.
  In this paper, we give an upper bound for $\La(Q,P)$ when $Q$ is a double
chain and $P$ is any graded poset, which is better than the previous known
upper bound, by means of finding the indpendence number of an auxiliary graph
related to $P$. For the auxiliary graph, we can find its independence number in
polynomial time. In addition, we give methods to construct the posets
satisfying the Griggs-Lu conjecture.


title:
Dissociative Electron Attachment to the Nitroamine HMX
  (Octahydro-1,3,5,7-Tetranitro-1,3,5,7-Tetrazocine)

abstract:
  In the present study, dissociative electron attachment (DEA) measurements
with gas phase HMX, octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine,
$C_4H_8N_8O_8$, have been performed by means of a crossed electron-molecular
beam experiment. The most intense signals are observed at 46 and 176u and
assigned to $NO_{2}^{-}$ and $C_3H_6N_5O_{4}^{-}$, respectively. Anion
efficiency curves for 15 negatively charged fragments have been measured in the
electron energy region from about 0-20 eV with an energy resolution of ~0.7 eV.
Product anions are observed mainly in the low energy region, near 0 eV, arising
from surprisingly complex reactions associated with multiple bond cleavages and
structural and electronic rearrangement. The remarkable instability of HMX
towards electron attachment with virtually zero kinetic energy reflects the
highly explosive nature of this compound. Substantially different intensity
ratios of resonances for common fragment anions allow distinguishing the
nitroamines HMX and royal demolition explosive molecule (RDX) in negative ion
mass spectrometry based on free electron capture.


title: Cuspidal divisor class groups of non-split Cartan modular curves

abstract:
  I find an explicit description of modular units in terms of Siegel functions
for the modular curves $X^+_{ns}(p^k)$ associated to the normalizer of a
non-split Cartan subgroup of level $p^k$ where $p\not=2,3$ is a prime. The
Cuspidal Divisor Class Group $\mathfrak{C}^+_{ns}(p^k)$ on $X^+_{ns}(p^k)$ is
explicitly described as a module over the group ring $R =
\mathbb{Z}[(\mathbb{Z}/p^k\mathbb{Z})^*/\{\pm 1\}]$. In this paper I give a
formula involving generalized Bernoulli numbers $B_{2,\chi}$ for
$|\mathfrak{C}^+_{ns}(p^k)|$.


title: Drift-induced Benjamin-Feir instabilities

abstract:
  A modified version of the Ginzburg-Landau equation is introduced which
accounts for asymmetric couplings between neighbors sites on a one-dimensional
lattice, with periodic boundary conditions. The drift term which reflects the
imposed microscopic asymmetry seeds a generalized class of instabilities,
reminiscent of the Benjamin-Feir type. The uniformly synchronized solution is
spontaneously destabilized outside the region of parameters classically
associated to the Benjamin-Feir instability, upon injection of a non
homogeneous perturbation. The ensuing patterns can be of the traveling wave
type or display a patchy, colorful mosaic for the modulus of the complex
oscillators amplitude.


title: Curvature-Restored Gauge Invariance and Ultraviolet Naturalness

abstract:
  It is shown that, $(a \Lambda^2 + b |H|^2)R$ in a spacetime of curvature $R$
is a natural ultraviolet $(U\!V)$ completion of $(a \Lambda^4 + b \Lambda^2
|H|^2)$ in the flat-spacetime Standard Model $(S\!M)$ with Higgs field $H$,
$U\!V$ scale $\Lambda$ and loop factors $a$, $b$. This curvature completion
rests on the fact that a $\Lambda$-mass gauge theory in flat spacetime turns,
on the cut-view $R = 4 \Lambda^2$, into a massless gauge theory in curved
spacetime. It provides a symmetry reason for curved spacetime, wherein gravity
and matter are both low-energy effective phenomena. Gravity arises correctly if
new physics exists with at least 63 more bosons than fermions, with no need to
interact with the $S\!M$ and with dark matter as a natural harbinger. It can
source various cosmological, astrophysical and collider phenomena depending on
its spectrum and couplings to the $S\!M$.


title:
Metrical star discrepancy bounds for lacunary subsequences of digital
  Kronecker-sequences and polynomial tractability

abstract:
  The star discrepancy $D_N^*(\mathcal{P})$ is a quantitative measure for the
irregularity of distribution of a finite point set $\mathcal{P}$ in the
multi-dimensional unit cube which is intimately related to the integration
error of quasi-Monte Carlo algorithms. It is known that for every integer $N
\ge 2$ there are point sets $\mathcal{P}$ in $[0,1)^d$ with $|\mathcal{P}|=N$
and $D_N^*(\mathcal{P}) =O((\log N)^{d-1}/N)$. However, for small $N$ compared
to the dimension $d$ this asymptotically excellent bound is useless (e.g. for
$N \le {\rm e}^{d-1}$).
  In 2001 it has been shown by Heinrich, Novak, Wasilkowski and
Wo\'{z}niakowski that for every integer $N \ge 2$ there exist point sets
$\mathcal{P}$ in $[0,1)^d$ with $|\mathcal{P}|=N$ and $D_N^*(\mathcal{P}) \le C
\sqrt{d/N}$. Although not optimal in an asymptotic sense in $N$, this upper
bound has a much better (and even optimal) dependence on the dimension $d$.
  Unfortunately the result by Heinrich et al. and also later variants thereof
by other authors are pure existence results and until now no explicit
construction of point sets with the above properties are known. Quite recently
L\"obbe studied lacunary subsequences of Kronecker's $(n
\boldsymbol{\alpha})$-sequence and showed a metrical discrepancy bound of the
form $C \sqrt{d (\log d)/N}$ with implied absolute constant $C>0$ independent
of $N$ and $d$.
  In this paper we show a corresponding result for digital Kronecker sequences,
which are a non-archimedean analog of classical Kronecker sequences.


title:
Cosmic Galaxy-IGM HI Relation at ${\it{z}}\sim 2-3$ Probed in the
  COSMOS/UltraVISTA $1.6$ deg$^2$ Field

abstract:
  We present spatial correlations of galaxies and IGM HI in the
COSMOS/UltraVISTA 1.62 deg$^2$ field. Our data consist of 13,415 photo-$z$
galaxies at $z\sim2-3$ with $K_s<23.4$ and the Ly$\alpha$ forest absorptions in
the background quasar spectra selected from SDSS data with no signature of
damped Ly$\alpha$ system contamination. We estimate a galaxy overdensity
$\delta_{gal}$ in an impact parameter of 2.5 pMpc, and calculate the Ly$\alpha$
forest fluctuations $\delta_{\langle F\rangle}$ whose negative values
correspond to the strong Ly$\alpha$ forest absorptions. We identify weak
evidence of an anti-correlation between $\delta_{gal}$ and $\delta_{\langle
F\rangle}$ with a Spearman's rank correlation coefficient of $-0.39$ suggesting
that the galaxy overdensities and the Ly$\alpha$ forest absorptions positively
correlate in space at the $\sim90\%$ confidence level. This positive
correlation indicates that high-$z$ galaxies exist around an excess of HI gas
in the Ly$\alpha$ forest. We find four cosmic volumes, dubbed
$A_{obs}$-$D_{obs}$, that have extremely large (small) values of $\delta_{gal}
\simeq0.8$ ($-1$) and $\delta_{\langle F\rangle}$ $\simeq0.1$ ($-0.4$), three
out of which, $B_{obs}$-$D_{obs}$, significantly depart from the correlation,
and weaken the correlation signal. We perform cosmological hydrodynamical
simulations, and compare with our observational results. Our simulations
reproduce the correlation, agreeing with the observational results. Moreover,
our simulations have model counterparts of $A_{obs}$-$D_{obs}$, and suggest
that the observations pinpoint, by chance, a galaxy overdensity like a
proto-cluster, gas filaments lying on the sightline, a large void, and
orthogonal low-density filaments. Our simulations indicate that the significant
departures of $B_{obs}$-$D_{obs}$ are produced by the filamentary large-scale
structures and the observation sightline effects.


title:
Understanding decreases in land relative humidity with global warming:
  conceptual model and GCM simulations

abstract:
  Climate models simulate a strong land-ocean contrast in the response of
near-surface relative humidity to global warming: relative humidity tends to
increase slightly over oceans but decrease substantially over land. Surface
energy balance arguments have been used to understand the response over ocean
but are difficult to apply over more complex land surfaces. Here, a conceptual
box model is introduced, involving moisture transport between the land and
ocean boundary layers and evapotranspiration, to investigate the decreases in
land relative humidity as the climate warms. The box model is applied to
idealized and full-complexity (CMIP5) general circulation model simulations,
and it is found to capture many of the features of the simulated changes in
land relative humidity. The box model suggests there is a strong link between
fractional changes in specific humidity over land and ocean, and the greater
warming over land than ocean then implies a decrease in land relative humidity.
Evapotranspiration is of secondary importance for the increase in specific
humidity over land, but it matters more for the decrease in relative humidity.
Further analysis shows there is a strong feedback between changes in
surface-air temperature and relative humidity, and this can amplify the
influence on relative humidity of factors such as stomatal conductance and soil
moisture.


title: Healthiness from Duality

abstract:
  Healthiness is a good old question in program logics that dates back to
Dijkstra. It asks for an intrinsic characterization of those predicate
transformers which arise as the (backward) interpretation of a certain class of
programs. There are several results known for healthiness conditions: for
deterministic programs, nondeterministic ones, probabilistic ones, etc.
Building upon our previous works on so-called state-and-effect triangles, we
contribute a unified categorical framework for investigating healthiness
conditions. We find the framework to be centered around a dual adjunction
induced by a dualizing object, together with our notion of relative
Eilenberg-Moore algebra playing fundamental roles too. The latter notion seems
interesting in its own right in the context of monads, Lawvere theories and
enriched categories.


title: Hybrid Spectrum Access for mmWave Networks

abstract:
  While spectrum at millimeter wave (mmWave) frequencies is less scarce than at
traditional frequencies below 6 GHz, still it is not unlimited, in particular
if we consider the requirements from other services using the same band and the
need to license mmWave bands to multiple mobile operators. Therefore, an
efficient spectrum access scheme is critical to harvest the maximum benefit
from emerging mmWave technologies. In this paper, motivated by previous results
where spectrum pooling was proved to be more feasible at high mmWave
frequencies, we study the performance of a hybrid spectrum scheme where
exclusive access is used at frequencies in the 20/30 GHz range while spectrum
pooling/unlicensed spectrum is used at frequencies around 70 GHz. Our
preliminary results show that hybrid spectrum access is a promising approach
for mmWave networks, and motivate further studies to achieve a more complete
understanding of both technical and non technical implications.


title: Quantum Simulation with Interacting Photons

abstract:
  Enhancing optical nonlinearities so that they become appreciable on the
single photon level and lead to nonclassical light fields has been a central
objective in quantum optics for many years. After this has been achieved in
individual micro-cavities representing an effectively zero-dimensional volume,
this line of research has shifted its focus towards engineering devices where
such strong optical nonlinearities simultaneously occur in extended volumes of
multiple nodes of a network. Recent technological progress in several
experimental platforms now opens the possibility to employ the systems of
strongly interacting photons these give rise to as quantum simulators. Here we
review the recent development and current status of this research direction for
theory and experiment. Addressing both, optical photons interacting with atoms
and microwave photons in networks of superconducting circuits, we focus on
analogue quantum simulations in scenarios where effective photon-photon
interactions exceed dissipative processes in the considered platforms.


title: Waring loci and the Strassen conjecture

abstract:
  The Waring locus of a form F is the collection of the degree one forms
appearing in some minimal sum of powers decomposition of F. In this paper, we
give a complete description of Waring loci for several family of forms, such as
quadrics, monomials, binary forms and plane cubics. We also introduce a Waring
loci version of Strassen's Conjecture, which implies the original conjecture,
and we prove it in many cases.


title: A geometric formulation of exceptional field theory

abstract:
  We formulate the full bosonic SL(5) exceptional field theory in a
coordinate-invariant manner. Thereby we interpret the 10-dimensional extended
space as a manifold with $\mathrm{SL}(5)\times\mathbb{R}^+$-structure. We show
that the algebra of generalised diffeomorphisms closes subject to a set of
closure constraints which are reminiscent of the quadratic and linear
constraints of maximal seven-dimensional gauged supergravities, as well as the
section condition. We construct an action for the full bosonic SL(5)
exceptional field theory, even when the
$\mathrm{SL}(5)\times\mathbb{R}^+$-structure is not locally flat.


title:
Enhanced density fluctuations in water-ethanol mixtures at low ethanol
  concentrations: Temperature dependent studies

abstract:
  Since the structural transformations observed in water-ethanol binary
mixtures are apparently driven by relatively weak intermolecular forces (like
hydrophobicity and hydrogen bonding) that often cooperate to form self
assembled structures, one expects the aggregation properties to show strong
temperature dependence. We study the effect of temperature on the formation of
transient ethanol clusters as well as on the dynamic density heterogeneity
induced in the system due to such clustering. The dynamic heterogeneity is
expected to occur on small length scales with short lifetime and both are
expected to be temperature dependent. Indeed, a major finding of the work is
strong temperature dependence of the extent of structural heterogeneity.
Distinct signature of static and dynamic heterogeneity of ethanol molecules is
also found to appear with lowering of temperature. This is attributed to the
formation of transient ethanol clusters that are known to exhibit considerably
small lifetime (order of a few picosecond). The transient dynamical features of
dynamic heterogeneity are expected to affect those relaxation processes
occurring at sub-picosecond time scales. On the other hand, strong temperature
dependence of micro-structure formation can be anticipated to be due to
enhanced structural order stimulated in the system with lowering of
temperature. Present analyses reveal a number of interesting features which
were not explored beforehand in this widely studied binary mixture.


title:
A CDMFT study of antiferromagnetic transition in the square-lattice
  Hubbard model: optical conductivity and electronic structure

abstract:
  We numerically study optical conductivity $\sigma (\omega )$ near the
"antiferromagnetic" phase transition in the square-lattice Hubbard model at
half filling. We use a cluster dynamical mean field theory and calculate
conductivity including vertex corrections, and to this end, we have
reformulated the vertex corrections in the antiferromagnetic phase. We find
that the vertex corrections change various important details in temperature-
and $\omega$-dependencies of conductivity in the square lattice, and this
contrasts sharply the case of the Mott transition in the frustrated triangular
lattice. Generally, the vertex corrections enhance variations in the
$\omega$-dependence, and sharpen the Drude peak and a high-$\omega$ incoherent
peak in the paramagnetic phase. They also enhance the dip in $\sigma (\omega )$
at $\omega$=0 in the antiferromagnetic phase. Therefore, the dc conductivity is
enhanced in the paramagnetic phase and suppressed in the antiferromagnetic
phase, but this change occurs slightly below the transition temperature. We
also find a temperature region above the transition temperature in which the dc
conductivity shows an insulating behavior but $\sigma (\omega )$ retains the
Drude peak, and this region is stabilized by the vertex corrections. We also
investigate which fluctuations are important in the vertex corrections and
analyze momentum dependence of the vertex function in detail.


title: Highly Accurate Prediction of Jobs Runtime Classes

abstract:
  Separating the short jobs from the long is a known technique to improve
scheduling performance. In this paper we describe a method we developed for
accurately predicting the runtimes classes of the jobs to enable this
separation. Our method uses the fact that the runtimes can be represented as a
mixture of overlapping Gaussian distributions, in order to train a CART
classifier to provide the prediction. The threshold that separates the short
jobs from the long jobs is determined during the evaluation of the classifier
to maximize prediction accuracy. Our results indicate overall accuracy of 90%
for the data set used in our study, with sensitivity and specificity both above
90%.


title: Super-Resonant Intracavity Coherent Absorption

abstract:
  The capability of optical resonators to extend the effective radiation-matter
interaction length originates from a multipass effect, hence is intrinsically
limited by the resonator quality factor. Here, we show that this constraint can
be overcome by combining the concepts of resonant interaction and coherent
perfect absorption. We demonstrate and investigate super-resonant coherent
absorption in a coupled Fabry-Perot-ring cavity structure. At the FP resonant
wavelengths, the described phenomenon gives rise to split modes with a
nearly-transparent peak and a peak whose transmission is exceptionally
sensitive to the intracavity loss. For small losses, the effective interaction
pathlength of these modes is proportional respectively to the ratio and the
product of the individual finesse coefficients of the two resonators. The
results presented extend the conventional definition of resonant absorption and
point to a way of circumventing the technological limitations of
ultrahigh-quality resonators in spectroscopy and optical sensing schemes


title: A New NOMA Approach for Fair Power Allocation

abstract:
  A non-orthogonal multiple access (NOMA) approach to user signal power
allocation called Fair-NOMA is introduced. Fair-NOMA is the application of NOMA
in such a way that two mobile users have the opportunity to always achieve at
least the information capacity they can achieve by using orthogonal multiple
access (OMA), regardless of the user selection criteria, making it suitable for
implementation using any current or future scheduling paradigms. Given this
condition, the bounds of the power allocation coefficients are derived as
functions of the channel gains of the two mobile users. The NOMA power
allocation is analyzed for two scheduled users that are selected randomly with
i.i.d. channel gains. The capacity improvements made by each user and the sum
capacity improvement are derived.


title:
Recovery of non-linear cause-effect relationships from linearly mixed
  neuroimaging data

abstract:
  Causal inference concerns the identification of cause-effect relationships
between variables. However, often only linear combinations of variables
constitute meaningful causal variables. For example, recovering the signal of a
cortical source from electroencephalography requires a well-tuned combination
of signals recorded at multiple electrodes. We recently introduced the MERLiN
(Mixture Effect Recovery in Linear Networks) algorithm that is able to recover,
from an observed linear mixture, a causal variable that is a linear effect of
another given variable. Here we relax the assumption of this cause-effect
relationship being linear and present an extended algorithm that can pick up
non-linear cause-effect relationships. Thus, the main contribution is an
algorithm (and ready to use code) that has broader applicability and allows for
a richer model class. Furthermore, a comparative analysis indicates that the
assumption of linear cause-effect relationships is not restrictive in analysing
electroencephalographic data.


title: Revisiting Human Action Recognition: Personalization vs. Generalization

abstract:
  By thoroughly revisiting the classic human action recognition paradigm, this
paper aims at proposing a new approach for the design of effective action
classification systems. Taking as testbed publicly available three-dimensional
(MoCap) action/activity datasets, we analyzed and validated different
training/testing strategies. In particular, considering that each human action
in the datasets is performed several times by different subjects, we were able
to precisely quantify the effect of inter- and intra-subject variability, so as
to figure out the impact of several learning approaches in terms of
classification performance. The net result is that standard testing strategies
consisting in cross-validating the algorithm using typical splits of the data
(holdout, k-fold, or one-subject-out) is always outperformed by a
"personalization" strategy which learns how a subject is performing an action.
In other words, it is advantageous to customize (i.e., personalize) the method
to learn the actions carried out by each subject, rather than trying to
generalize the actions executions across subjects. Consequently, we finally
propose an action recognition framework consisting of a two-stage
classification approach where, given a test action, the subject is first
identified before the actual recognition of the action takes place. Despite the
basic, off-the-shelf descriptors and standard classifiers adopted, we noted a
relevant increase in performance with respect to standard state-of-the-art
algorithms, so motivating the usage of personalized approaches for designing
effective action recognition systems.


title:
Spectral analysis of two doubly infinite Jacobi matrices with
  exponential entries

abstract:
  We provide a complete spectral analysis of all self-adjoint operators acting
on $\ell^{2}(\mathbb{Z})$ which are associated with two doubly infinite Jacobi
matrices with entries given by $$ q^{-n+1}\delta_{m,n-1}+q^{-n}\delta_{m,n+1}
$$ and $$ \delta_{m,n-1}+\alpha q^{-n}\delta_{m,n}+\delta_{m,n+1}, $$
respectively, where $q\in(0,1)$ and $\alpha\in\mathbb{R}$. As an application,
we derive orthogonality relations for the Ramanujan entire function and the
third Jackson $q$-Bessel function.


title:
Leggett-Garg Inequality for a Two-Level System under Decoherence: A
  Broader Range of Violation

abstract:
  We consider a macroscopic quantum system in a tilted double-well potential.
By solving Hamiltonian equation, we obtain tunneling probabilities which
contain oscillation effects. To show how one can decide between quantum
mechanics and the implications of macrorealism assumption, a given form of
Leggett-Garg inequality is used. The violation of this inequality occurs for a
broader range of decoherence effects, compared to previous results obtained for
two-level systems.


title:
Application of the MST clustering to the high energy gamma-ray sky. II -
  Possible detection of gamma-ray emission from blazar candidates in the 1WHSP
  sample

abstract:
  We present the results of a photon cluster search in the 7-years Fermi-Large
Area Telescope extragalactic Pass 8 gamma-ray sky by means of the Minimum
Spanning Tree (MST) algorithm, at energies higher than 10 GeV. We found 16
clusters of photons, corresponding to candidate gamma-ray sources, located very
close to infrared-selected sources in the 1WHSP (WISE High Synchrotron Peaked)
sample, and therein classified as either "new" or "candidate" blazars. In this
paper some properties of the MST clusters and of the associated sources are
presented.


title:
Low temperature thermodynamic investigation of the phase diagram of
  Sr$_3$Ru$_2$O$_7$

abstract:
  We studied the phase diagram of Sr$_3$Ru$_2$O$_7$ by means of heat capacity
and magnetocaloric effect measurements at temperatures as low as 0.06 K and
fields up to 12 T. We confirm the presence of a new quantum critical point at
7.5 T which is characterized by a strong non-Fermi-liquid behavior of the
electronic specific heat coefficient $\Delta$C/T $\sim$ -logT over more than a
decade in temperature,placing strong constraints on theories of its
criticality. In particular logarithmic corrections are found when the dimension
d is equal to the dynamic critical exponent z, in contrast to the conclusion
proposed recently [Y. Tokiwa et al., Phys. Rev. Lett. 116, 226402 (2016)].
Moreover, we achieved a clear determination of the new second thermodynamic
phase adjoining the first one at lower temperatures. Its thermodynamic features
differ significantly from those of the dominant phase and characteristics
expected of classical equilibrium phase transitions are not observed,
indicating fundamental differences in the phase formation.


title:
Rank two perturbations of matrices and operators and operator model for
  t-transformation of probability measures

abstract:
  Rank two parametric perturbations of operators and matrices are studied in
various settings. In the finite dimensional case the formula for a
characteristic polynomial is derived and the large parameter asymptotics of the
spectrum is computed. The large parameter asymptotics of a rank one
perturbation of singular values and condition number are discussed as well. In
the operator case the formula for a rank two transformation of the spectral
measure is derived and it appears to be the t-transformation of a probability
measure, studied previously in the free probability context. New transformation
of measures is studied and several examples are presented.


title: Dynamic Address Allocation Algorithm for Mobile Ad hoc Networks

abstract:
  A Mobile Ad hoc network (MANET) consists of nodes which use multi-hop
communication to establish connection between nodes. Traditional infrastructure
based systems use a centralized architecture for address allocation. However,
this is not possible in Ad hoc networks due to their dynamic structure. Many
schemes have been proposed to solve this problem, but most of them use
network-wide broadcasts to ensure the availability of a new address. This
becomes extremely difficult as network size grows. In this paper, we propose an
address allocation algorithm which avoids network-wide broadcasts to allocate
address to a new node. Moreover, the algorithm allocates addresses dynamically
such that the network maintains an "IP resembles topology" state. In such a
state, routing becomes easier and the overall overhead in communication is
reduced. This algorithm is particularly useful for routing protocols which use
topology information to route messages in the network. Our solution is designed
with scalability in mind such that the cost of address assignment to a new node
is independent of the number of nodes in the network.


title: Cavitation inception of a van der Waals fluid at a sack-wall obstacle

abstract:
  Cavitation in a liquid moving past a constraint is numerically investigated
by means of a free-energy lattice Boltzmann simulation based on the van der
Waals equation of state. The fluid is streamed past an obstacle and, depending
on the pressure drop between inlet and outlet, vapor formation underneath the
corner of the sack-wall is observed. The circumstances of cavitation formation
are investigated and it is found that the local bulk pressure and mean stress
are insufficient to explain the phenomenon. Results obtained in this study
strongly suggest that the viscous stress, interfacial contributions to the
local pressure, and the Laplace pressure are relevant to the opening of a vapor
cavity. This can be described by a generalization of Joseph's criterion that
includes these contributions. A macroscopic investigation measuring mass flow
rate behavior and discharge coefficient was also performed. As theoretically
predicted, mass flow rate increases linearly with the square root of the
pressure drop. However, when cavitation occurs, the mass flow growth rate is
reduced and eventually it collapses into a choked flow state. In the cavitating
regime, as theoretically predicted and experimentally verified, the discharge
coefficient grows with the Nurick cavitation number.


title:
Application of the MST clustering to the high energy gamma-ray sky. III
  - New detections of gamma-ray emission from blazars

abstract:
  We present the results of a photon cluster search in the gamma-ray sky
observed by the Fermi Large Area Telescope, using the new Pass 8 dataset, at
energies higher than 10 GeV. By means of the Minimum Spanning Tree (MST)
algorithm, we found 25 clusters associated with catalogued blazars not
previously known as gamma-ray emitters. The properties of these sources are
discussed.


title: Interfilament Resistance at 77 K in Striated HTS Coated Conductors

abstract:
  Striating HTS coated conductor (CC) tapes into narrow filaments offers the
possibility of reducing the tapes' magnetization losses without unreasonably
decreasing their current-carrying capability. However, realizing well-separated
striations presents technological challenges, especially if the number of
filaments is large and/or if a thick layer of metallic stabilizer is present.
In these situations, the filaments can be easily coupled and their
effectiveness to reduce magnetization losses is strongly diminished or
eliminated. While the onset of coupling is well visible from magnetization loss
measurements, the actual path of the coupling current is unknown. In this
contribution we present a systematic study of the transverse resistance in HTS
CC samples in order to get a deeper understanding of those paths. The measured
samples differ in terms of manufacturer (SuperPower and SuperOx), and presence
and thickness of stabilizer material. In addition, oxidation is used as a means
to increase the resistance between the filaments in non-stabilized samples. The
results are interpreted with a chain network model. This work provides useful
insights on the factors determining the transverse resistance in striated HTS
CCs, thus indicating ways to improve the effectiveness of the striation process
for AC loss reduction.


title: Symbolic-Numeric Tools for Analytic Combinatorics in Several Variables

abstract:
  Analytic combinatorics studies the asymptotic behaviour of sequences through
the analytic properties of their generating functions. This article provides
effective algorithms required for the study of analytic combinatorics in
several variables, together with their complexity analyses. Given a
multivariate rational function we show how to compute its smooth isolated
critical points, with respect to a polynomial map encoding asymptotic
behaviour, in complexity singly exponential in the degree of its denominator.
We introduce a numerical Kronecker representation for solutions of polynomial
systems with rational coefficients and show that it can be used to decide
several properties (0 coordinate, equal coordinates, sign conditions for real
solutions, and vanishing of a polynomial) in good bit complexity. Among the
critical points, those that are minimal---a property governed by inequalities
on the moduli of the coordinates---typically determine the dominant asymptotics
of the diagonal coefficient sequence. When the Taylor expansion at the origin
has all non-negative coefficients (known as the `combinatorial case') and under
regularity conditions, we utilize this Kronecker representation to determine
probabilistically the minimal critical points in complexity singly exponential
in the degree of the denominator, with good control over the exponent in the
bit complexity estimate. Generically in the combinatorial case, this allows one
to automatically and rigorously determine asymptotics for the diagonal
coefficient sequence. Examples obtained with a preliminary implementation show
the wide applicability of this approach.


title: Higher Spin Double Field Theory : A Proposal

abstract:
  We construct a double field theory coupled to the fields present in
Vasiliev's equations. Employing the "semi-covariant" differential geometry, we
spell a functional in which each term is completely covariant with respect to
$\mathbf{O}(4,4)$ T-duality, doubled diffeomorphisms, $\mathbf{Spin}(1,3)$
local Lorentz symmetry and, separately, $\mathbf{HS}(4)$ higher spin gauge
symmetry. We identify a minimal set of BPS-like conditions whose solutions
automatically satisfy the full Euler-Lagrange equations. As such a solution, we
derive a linear dilaton vacuum. With extra algebraic constraints further
supplemented, the BPS-like conditions reduce to the bosonic Vasiliev equations.


title: Simple2Complex: Global Optimization by Gradient Descent

abstract:
  A method named simple2complex for modeling and training deep neural networks
is proposed. Simple2complex train deep neural networks by smoothly adding more
and more layers to the shallow networks, as the learning procedure going on,
the network is just like growing. Compared with learning by end2end,
simple2complex is with less possibility trapping into local minimal, namely,
owning ability for global optimization. Cifar10 is used for verifying the
superiority of simple2complex.


title:
Gradient Descent Only Converges to Minimizers: Non-Isolated Critical
  Points and Invariant Regions

abstract:
  Given a non-convex twice differentiable cost function f, we prove that the
set of initial conditions so that gradient descent converges to saddle points
where \nabla^2 f has at least one strictly negative eigenvalue has (Lebesgue)
measure zero, even for cost functions f with non-isolated critical points,
answering an open question in [Lee, Simchowitz, Jordan, Recht, COLT2016].
Moreover, this result extends to forward-invariant convex subspaces, allowing
for weak (non-globally Lipschitz) smoothness assumptions. Finally, we produce
an upper bound on the allowable step-size.


title:
A Tight Lower Bound for the Weights of Maximum Weight Matching in
  Bipartite Graphs

abstract:
  Let $\Ga$ be the collection of all weighted bipartite graphs each having
$\sigma$ and $m$, as the size of a vertex partition and the total weight,
respectively. We give a tight lower bound $\lceil \frac{m-\sigma}{\sigma}
\rceil+1$ for the set $\{\textit{Wt}(\textit{mwm}(G))~|~G \in \Ga\}$ which
denotes the collection of weights of maximum weight bipartite matchings of all
graphs in $\Ga$.


title: The multiphase starburst-driven galactic wind in NGC 5394

abstract:
  We present a detailed study of the neutral and ionised gas phases in the
galactic wind for the nearby starburst galaxy NGC 5394 based on new integral
field spectroscopy obtained with the INTEGRAL fibre system at the William
Herschel Telescope. The neutral gas phase in the wind is detected via the
interstellar NaI D doublet absorption. After a careful removal of the stellar
contribution to these lines, a significant amount of neutral gas (~10^7 Msun)
is detected in a central region of ~1.75 kpc size. This neutral gas is
blueshifted by ~165 km/s with respect to the underlying galaxy. The mass
outflow of neutral gas is comparable to the star formation rate of the host
galaxy. Simultaneously, several emission lines (Ha, [NII], [SII]) are also
analysed looking for the ionised warm phase counterpart of the wind. A careful
kinematic decomposition of the line profiles reveals the presence of a
secondary, broader, kinematic component. This component is found roughly in the
same region where the NaI D absorption is detected. It presents higher [NII]/Ha
and [SII]/Ha line ratios than the narrow component at the same locations,
indicative of contamination by shock ionization. This secondary component also
presents blueshifted velocities, although smaller than those measured for the
neutral gas, averaging to ~ -30 km/s. The mass and mass outflow rate of the
wind is dominated by the neutral gas, of which a small fraction might be able
to escape the gravitational potential of the host galaxy. The observations in
this system can be readily understood within a bipolar gas flow scenario.


title: Future measurements of the Lense-Thirring effect in the Double Pulsar

abstract:
  The Double Pulsar system PSR J0737-3039A/B has proven to be an excellent
laboratory for high precision tests of general relativity. With additional
years of timing measurements and new telescopes like the Square Kilometre Array
(SKA), the precision of these tests will increase and new effects like the
Lense-Thirring precession of the orbit will become measurable. Here, we discuss
the prospects of measuring the Lense-Thirring effect and thereby constraining
the equations of state at supra-nuclear densities in neutron stars using the
Double Pulsar.


title:
Fair Coexistence of Scheduled and Random Access Wireless Networks:
  Unlicensed LTE/WiFi

abstract:
  We study the fair coexistence of scheduled and random access transmitters
sharing the same frequency channel. Interest in coexistence is topical due to
the need for emerging unlicensed LTE technologies to coexist fairly with WiFi.
However, this interest is not confined to LTE/WiFi as coexistence is likely to
become increasingly commonplace in IoT networks and beyond 5G. In this article
we show that mixing scheduled and random access incurs and inherent
throughput/delay cost, the cost of heterogeneity. We derive the joint
proportional fair rate allocation, which casts useful light on current LTE/WiFi
discussions. We present experimental results on inter-technology detection and
consider the impact of imperfect carrier sensing.


title: Computing Real Roots of Real Polynomials ... and now For Real!

abstract:
  Very recent work introduces an asymptotically fast subdivision algorithm,
denoted ANewDsc, for isolating the real roots of a univariate real polynomial.
The method combines Descartes' Rule of Signs to test intervals for the
existence of roots, Newton iteration to speed up convergence against clusters
of roots, and approximate computation to decrease the required precision. It
achieves record bounds on the worst-case complexity for the considered problem,
matching the complexity of Pan's method for computing all complex roots and
improving upon the complexity of other subdivision methods by several
magnitudes.
  In the article at hand, we report on an implementation of ANewDsc on top of
the RS root isolator. RS is a highly efficient realization of the classical
Descartes method and currently serves as the default real root solver in Maple.
We describe crucial design changes within ANewDsc and RS that led to a
high-performance implementation without harming the theoretical complexity of
the underlying algorithm.
  With an excerpt of our extensive collection of benchmarks, available online
at http://anewdsc.mpi-inf.mpg.de/, we illustrate that the theoretical gain in
performance of ANewDsc over other subdivision methods also transfers into
practice. These experiments also show that our new implementation outperforms
both RS and mature competitors by magnitudes for notoriously hard instances
with clustered roots. For all other instances, we avoid almost any overhead by
integrating additional optimizations and heuristics.


title: Rigidity of integral coisotropic submanifolds of contact manifolds

abstract:
  Unlike Legendrian submanifolds, the deformation problem of coisotropic
submanifolds can be obstructed. Starting from this observation, we single out
in the contact setting the special class of integral coisotropic submanifolds
as the direct generalization of Legendrian submanifolds for what concerns
deformation and moduli theory. Indeed, being integral coisotropic is proved to
be a rigid condition, and moreover the integral coisotropic deformation problem
is unobstructed with discrete moduli space.


title: Density of Quantum States in Quasi-1D layers

abstract:
  Recently, new quantum effects have been studied in thin nano-grating layers.
Nano-grating on the surface imposes additional boundary conditions on the
electron wave function and reduces the density of states (DOS). When the
nano-grating dimensions are close to the de Broglie wavelength, the DOS
reduction is considerable and leads to changes in the layer properties. DOS
calculations are challenging to perform and are related to the quantum billiard
problem. Performing such calculations requires finding the solutions for the
time-independent Schrodinger equation with Dirichlet boundary conditions. Here,
we use a numerical method, namely the method of auxiliary sources, which offers
significant computational cost reduction relative to other numerical methods.
We found the first five eigenfunctions for the nano-grating layer and compared
them with the corresponding eigenfunctions for a plain layer by calculating the
correlation coefficients. Furthermore, the numerical data were used to analyze
the DOS reduction. The nano-grating is shown to reduce the probability of
occupation of a particular quantum state, reducing the integrated DOS by as
much as 4.1 -fold. This reduction in the DOS leads to considerable changes in
the electronic properties.


title: N3LO NN interaction adjusted to light nuclei in ab exitu approach

abstract:
  We use phase-equivalent transformations to adjust off-shell properties of
similarity renormalization group evolved chiral effective field theory NN
interaction (Idaho N3LO) to fit selected binding energies and spectra of light
nuclei in an ab exitu approach. We then test the transformed interaction on a
set of additional observables in light nuclei to verify that it provides
reasonable descriptions of these observables with an apparent reduced need for
three- and many-nucleon interactions.


title:
On sampling theorem with sparse decimated samples: exploring branching
  spectrum degeneracy

abstract:
  The paper investigates possibility of recovery of sequences from their
decimated subsequences. It is shown that this recoverability is associated with
certain spectrum degeneracy of a new kind, and that a sequences of a general
kind can be approximated by sequences featuring this degeneracy. This is
applied to sparse sampling of continuous time band-limited functions. The paper
shows that these functions allow an arbitrarily close approximation by
functions that can be recovered from sparse equidistant samples with sampling
distance larger than the distance defined by the critical Nyquist rate for the
underlying function. This allows to bypass, in a certain sense, the restriction
on the sampling rate defined by the Nyquist rate.


abstract:
  Multivariate Poisson approximation of the length spectrum of random surfaces
is studied by means of the Chen-Stein method. This approach delivers simple and
explicit error bounds in Poisson limit theorems. They are used to prove that
Poisson approximation applies to curves of length up to order $o(\log\log g)$
with $g$ being the genus of the surface.


title: Puzzle maker in SmB6: accompany-type valence fluctuation state

abstract:
  In recent years, the study on the Kondo insulator SmB6, a strongly correlated
electron material with decades-long puzzles, has become one of the most
attractive topics again because the discovery of the coexistence of its unusual
metallic surface state with an insulating bulk. Many efforts have been made in
understanding the corresponding physics behind in SmB6, but some puzzles on it,
being hotly debated and argued, has not been solved. In this article, based on
the latest progress in our high pressure studies and the accumulating results
reported by other groups on SmB6, we propose a notion named as accompany-type
valence fluctuation state, which possibly coexists with the Kondo ground state
of SmB6. The purpose of this article is to search a common starting point from
which most of the accumulated low-temperature phenomena observed by different
experimental investigations on SmB6 could be understood in a unified way.
Although this notion is only our personal understanding from a phenomenological
point of view and may be immature, anyway, we expect that this notion could
attract rigorous theoretical interpretations and further experimental
investigations, or stimulate better thinking on the physics in SmB6.


title: Degree cones and monomial bases of Lie algebras and quantum groups

abstract:
  We provide $\mathbb{N}$-filtrations on the negative part
$U_q(\mathfrak{n}^-)$ of the quantum group associated to a finite-dimensional
simple Lie algebra $\mathfrak{g}$, such that the associated graded algebra is a
skew-polynomial algebra on $\mathfrak{n}^-$. The filtration is obtained by
assigning degrees to Lusztig's quantum PBW root vectors. The possible degrees
can be described as lattice points in certain polyhedral cones. In the
classical limit, such a degree induces an $\mathbb{N}$-filtration on any finite
dimensional simple $\mathfrak{g}$-module. We prove for type $\tt{A}_n$,
$\tt{C}_n$, $\tt{B}_3$, $\tt{D}_4$ and $\tt{G}_2$ that a degree can be chosen
such that the associated graded modules are defined by monomial ideals, and
conjecture that this is true for any $\mathfrak{g}$.


title: Performance of the SDHCAL technological prototype

abstract:
  The SDHCAL technological prototype is a $1 \times 1 \times 1.3$~m$^3$
high-granularity Semi-Digital Hadronic CALorimeter using Glass Resistive Plate
Chambers as sensitive medium. It is one of the two HCAL options considered by
the ILD Collaboration to be proposed for the detector of the future
International Linear Collider project. The prototype is made of up to 50 GRPC
detectors of 1~m$^2$ size and 3~mm thickness each with an embedded semi-digital
electronics readout that is autotriggering and power-pulsed. The GRPC readout
is finely segmented into pads of 1~cm$^2$. This proceeding describes the
prototype, its operation and its performance in energy reconstruction. Aspects
of the GRPC readout modelling and comparisons with simulations are also
presented.


title:
Well-Rounded Lattices for Reliability and Security in Rayleigh Fading
  SISO Channels

abstract:
  For many wiretap channel models asymptotically optimal coding schemes are
known, but less effort has been put into actual realizations of wiretap codes
for practical parameters. Bounds on the mutual information and error
probability when using coset coding on a Rayleigh fading channel were recently
established by Oggier and Belfiore, and the results in this paper build on
their work. However, instead of using their ultimate inverse norm sum
approximation, a more precise expression for the eavesdropper's probability of
correct decision is used in order to determine a general class of good coset
codes. The code constructions are based on well-rounded lattices arising from
simple geometric criteria. In addition to new coset codes and simulation
results, novel number-theoretic results on well-rounded ideal lattices are
presented.


title:
An Enhanced Harmony Search Method for Bangla Handwritten Character
  Recognition Using Region Sampling

abstract:
  Identification of minimum number of local regions of a handwritten character
image, containing well-defined discriminating features which are sufficient for
a minimal but complete description of the character is a challenging task. A
new region selection technique based on the idea of an enhanced Harmony Search
methodology has been proposed here. The powerful framework of Harmony Search
has been utilized to search the region space and detect only the most
informative regions for correctly recognizing the handwritten character. The
proposed method has been tested on handwritten samples of Bangla Basic,
Compound and mixed (Basic and Compound characters) characters separately with
SVM based classifier using a longest run based feature-set obtained from the
image subregions formed by a CG based quad-tree partitioning approach. Applying
this methodology on the above mentioned three types of datasets, respectively
43.75%, 12.5% and 37.5% gains have been achieved in terms of region reduction
and 2.3%, 0.6% and 1.2% gains have been achieved in terms of recognition
accuracy. The results show a sizeable reduction in the minimal number of
descriptive regions as well a significant increase in recognition accuracy for
all the datasets using the proposed technique. Thus the time and cost related
to feature extraction is decreased without dampening the corresponding
recognition accuracy.


title: Molecular line study of massive star forming regions from the RMS survey

abstract:
  In this paper we selected a sample of massive star forming regions from the
Red MSX Source (RMS) survey, to study star formation activities (mainly outflow
and inflow signatures).


title: Munchausen Iteration

abstract:
  We present a method for solving polynomial equations over idempotent
omega-continuous semirings. The idea is to iterate over the semiring of
functions rather than the semiring of interest, and only evaluate when needed.
The key operation is substitution. In the initial step, we compute a linear
completion of the system of equations that exhaustively inserts the equations
into one another. With functions as approximants, the following steps insert
the current approximant into itself. Since the iteration improves its precision
by substitution rather than computation we named it Munchausen, after the
fictional baron that pulled himself out of a swamp by his own hair. The first
result shows that an evaluation of the n-th Munchausen approximant coincides
with the 2^n-th Newton approximant. Second, we show how to compute linear
completions with standard techniques from automata theory. In particular, we
are not bound to (but can use) the notion of differentials prominent in Newton
iteration.


title: Isogeometric analysis using manifold-based smooth basis functions

abstract:
  We present an isogeometric analysis technique that builds on manifold-based
smooth basis functions for geometric modelling and analysis. Manifold-based
surface construction techniques are well known in geometric modelling and a
number of variants exist. Common to all is the concept of constructing a smooth
surface by blending together overlapping patches (or, charts), as in
differential geometry description of manifolds. Each patch on the surface has a
corresponding planar patch with a smooth one-to-one mapping onto the surface.
In our implementation, manifold techniques are combined with conformal
parametrisations and the partition-of-unity method for deriving smooth basis
functions on unstructured quadrilateral meshes. Each vertex and its adjacent
elements on the surface control mesh have a corresponding planar patch of
elements. The star-shaped planar patch with congruent wedge-shaped elements is
smoothly parameterised with copies of a conformally mapped unit square. The
conformal maps can be easily inverted in order to compute the transition
functions between the different planar patches that have an overlap on the
surface. On the collection of star-shaped planar patches the partition of unity
method is used for approximation. The smooth partition of unity, or blending
functions, are assembled from tensor-product b-spline segments defined on a
unit square. On each patch a polynomial with a prescribed degree is used as a
local approximant. To obtain a mesh-based approximation scheme, the
coefficients of the local approximants are expressed in dependence of vertex
coefficients. This yields a basis function for each vertex of the mesh which is
smooth and non-zero over a vertex and its adjacent elements. Our numerical
simulations indicate the optimal convergence of the resulting approximation
scheme for Poisson problems and near optimal convergence for thin-plate and
thin-shell problems.


title: Monitoring the Galactic Centre with Australia Telescope Compact Array

abstract:
  The supermassive black hole, Sagittarius A* (Sgr A*), at the centre of the
Milky Way undergoes regular flaring activity which is thought to arise from the
innermost region of the accretion flow. We performed the monitoring
observations of the Galactic Centre to study the flux-density variations at 3mm
using the Australia Telescope Compact Array (ATCA) between 2010 and 2014. We
obtain the light curves of Sgr A* by subtracting the contributions from the
extended emission around it, and the elevation and time dependent gains of the
telescope. We perform structure function analysis and the Bayesian blocks
representation to detect flare events. The observations detect six instances of
significant variability in the flux density of Sgr A* in three observations,
with variations between 0.5 to 1.0 Jy, which last for 1.5 $-$ 3 hours. We use
the adiabatically expanding plasmon model to explain the short time-scale
variations in the flux density. We derive the physical quantities of the
modelled flare emission, such as the source expansion speed $v_{\mathrm{exp}}$,
source sizes, spectral indices, and the turnover frequency. These parameters
imply that the expanding source components are either confined to the immediate
vicinity of Sgr A* by contributing to the corona or the disc, or have a bulk
motion greater than $v_{\mathrm{exp}}$. No exceptional flux density variation
on short flare time-scales was observed during the approach and the flyby of
the dusty S-cluster object (DSO/G2). This is consistent with its compactness
and the absence of a large bow shock.


title:
When Theory and Reality Collide: Demystifying the Effectiveness of
  Ambient Sensing for NFC-based Proximity Detection by Applying Relay Attack
  Data

abstract:
  Over the past decade, smartphones have become the point of convergence for
many applications and services. There is a growing trend in which traditional
smart-card based services like banking, transport and access control are being
provisioned through smartphones. Smartphones with Near Field Communication
(NFC) capability can emulate a contactless smart card; popular examples of such
services include Google Pay and Apple Pay. Similar to contactless smart cards,
NFC-based smartphone transactions are susceptible to relay attacks. For
contactless smart cards, distance-bounding protocols are proposed to counter
such attacks; for NFC-based smartphone transactions, ambient sensors have been
proposed as potential countermeasures. In this study, we have empirically
evaluated the suitability of ambient sensors as a proximity detection mechanism
for contactless transactions. To provide a comprehensive analysis, we also
collected relay attack data to ascertain whether ambient sensors are able to
thwart such attacks effectively. We initially evaluated 17 sensors before
selecting 7 sensors for in-depth analysis based on their effectiveness as
potential proximity detection mechanisms within the constraints of a
contactless transaction scenario. Each sensor was used to record 1000
legitimate and relay (illegitimate) contactless transactions at four different
physical locations. The analysis of these transactions provides an empirical
foundation on which to determine whether ambient sensors provide a strong
proximity detection mechanism for security-sensitive applications like banking,
transport and high-security access control.


title:
Dynamic Simulation of Electro-Hydrodynamically Interacting and
  Sedimenting Particles

abstract:
  Particle-particle interactions in sedimenting systems have been investigated
in the present study considering the many-body hydrodynamic and electrodynamic
interactions. These interactions primarily occur in two modes: near-field and
far-field interactions. The hydrodynamic interactions are modeled employing the
Stokesian Dynamics while the electrodynamic interactions are accounted using
the grand Capacitance matrix formulation capable of tackling externally applied
arbitrary electric field effects. It is seen that the presence of an external
electric field and asymmetry in particle positioning greatly modifies the
dynamics of the rigid dielectric spherical particles when compared with the
sedimenting system without the electric field effects. This is attributed to
the induced dipole moment interactions among the particles. A consequence of
the alterations in the particle arrangements also changes the net drag force
experienced by these sedimenting particles, which is also reported in the
present study. Furthermore, we have evaluated the induced background velocity
field of the continuous medium due to sedimentation of the particles. A net
velocity is observed in the continuous medium due to the sedimentation-induced
particle rotation, which is found to vary in presence of an external electric
field.


title:
Hydrodynamic collective effects of active proteins in biological
  membranes

abstract:
  Lipid bilayers forming biological membranes are known to behave as viscous 2D
fluids on submicrometer scales; usually they contain a large number of active
protein inclusions. Recently, it has been shown [Proc. Nat. Acad. Sci. USA 112,
E3639 (2015)] that such active proteins should in- duce non-thermal fluctuating
lipid flows leading to diffusion enhancement and chemotaxis-like drift for
passive inclusions in biomembranes. Here, a detailed analytical and numerical
investigation of such effects is performed. The attention is focused on the
situations when proteins are concentrated within lipid rafts. We demonstrate
that passive particles tend to become attracted by active rafts and are
accumulated inside them.

categories: cond-mat.soft nlin.PS physics.bio-ph q-bio.SC


title:
Parameter based design of a twin-cylinder wave energy converter for real
  sea-states

abstract:
  We discuss the hydrodynamics of a wave energy converter consisting of two
vertically floating, coaxial cylinders connected by dampers and allowed to
heave, sway and roll. This design, viable in deep water and able to extract
energy independent of the incident wave direction, is examined for
monochromatic waves as well as broad-banded seas described by a Pierson
Moskowitz spectrum. Several possible device sizes are considered, and their
performance is investigated for a design spectrum, as well as for more severe
sea states, with a view towards survivability of the converters. In terms of
device motions and captured power, a quantitative assessment of converter
design as it relates to survival and operation is provided. Most results are
given in dimensionless form to allow for a wide range of applications.


title:
Adaptive splitting methods for nonlinear Schr\"{o}dinger equations in
  the semiclassical regime

abstract:
  The error behavior of exponential operator splitting methods for nonlinear
Schr{\"o}dinger equations in the semiclassical regime is studied. For the Lie
and Strang splitting methods, the exact form of the local error is determined
and the dependence on the semiclassical parameter is identified. This is
enabled within a defect-based framework which also suggests asymptotically
correct a~posteriori local error estimators as the basis for adaptive time
stepsize selection. Numerical examples substantiate and complement the
theoretical investigations.


title:
Undamped relativistic magnetoplasmons in lossy two-dimensional electron
  systems

abstract:
  We address electrodynamic effects in plasma oscillations of a lossy 2D
electron system whose dc 2D conductivity is comparable to the speed of light.
We argue that the perpendicular constant magnetic field B causes astonishing
features of magnetoplasma dynamics. We show that plasmon-polariton spectra can
be classified using a 'relativistic' phase diagram 2D conductivity divided by
the speed of light versus B. An extraordinarily low damping branch in
magnetoplasmon-polariton spectra emerges at two phases of this diagram. Some
magnetoplasmons at these phases are predicted to be undamped waves.


title: Complex behaviour in cyclic competition bimatrix games

abstract:
  We consider an example of cyclic competition bimatrix game which is a
Rock-Scissors-Paper game with assumption about perfect memory of the playing
agents. At first we investigate the dynamics in the neighbourhood of the Nash
equilibrium as well as the dynamics on the boundary of codimension 1 - that is
when one of the strategies is not played by any agent. For the analysis of the
asymptotic behaviour close to the boundary of state space, we provide the
description of a naturally appearing heteroclinic network. Due to the symmetry,
the heteroclinic network induces a quotient network. This quotient network is
investigated as well. In the literature this model was already studied, but
unfortunately the results stated there are invalid, as we will show in this
paper. It turns out that certain types of behaviour are never possible or
appear in the system only for some parameter values, contradicting what was
stated before in the literature. Moreover, the parameter space (-1,1)x(-1,1) is
divided into four regions where we observe either irregular behaviour, or
preference to follow an itinerary consisting of strategies for which one or the
other agent does not lose, or they alternate in winning. These regions in
parameter space are separated by two analytical curves and lines where the game
is either symmetric (system is not $C^1$ linearisable at stationary saddle
points) or is zero-sum and the system is Hamiltonian. On each of these curves
we observe different bifurcation scenarios: e.g. transition from order to
chaos, or from one kind of stability to another kind, or just loss of one
dimension of the local stable manifold of the subcycle.


abstract:
  A new construction of naturally reductive spaces is presented. This
construction gives a large amount of new families of naturally reductive
spaces. First the infinitesimal models of the new naturally reductive spaces
are constructed. A concrete transitive group of isometries is given for the new
spaces and also the naturally reductive structure with respect to this group is
explicitly given.


title: Flavour Physics and CP Violation

abstract:
  We explain the many reasons for the interest in flavor physics. We describe
flavor physics and the related CP violation within the Standard Model, and
explain how the B-factories proved that the Kobayashi-Maskawa mechanism
dominates the CP violation that is observed in meson decays. We explain the
implications of flavor physics for new physics, with emphasis on the "new
physics flavor puzzle", and present the idea of minimal flavor violation as a
possible solution. We explain why the values flavor parameters of the Standard
Model are puzzling, present the Froggatt-Nielsen mechanism as a possible
solution, and describe how measurements of neutrino parameters are interpreted
in the context of this puzzle. We show that the recently discovered Higgslike
boson may provide new opportunities for making progress on the various flavor
puzzles.


title:
An Electric Vehicle Charging Management Scheme Based on
  Publish/Subscribe Communication Framework

abstract:
  Motivated by alleviating CO$_2$ pollution, Electric Vehicle (EV) based
applications have recently received wide interests from both commercial and
research communities by using electric energy instead of traditional fuel
energy. Although EVs are inherently with limited travelling distance, such
limitation could be overcome by deploying public Charging Stations (CSs) to
recharge EVs battery during their journeys. In this paper we propose a novel
communication framework for on-the-move EV charging scenario, based on the
Publish/Subscribe (P/S) mechanism for disseminating necessary CS information to
EVs, in order for them to make optimized decisions on where to charge. A core
part of our communication framework is the utilization of Road Side Units
(RSUs) to bridge the information flow from CSs to EVs, which has been regarded
as a type of cost-efficient communication infrastructure. Under this design, we
introduce two complementary communication modes of signalling protocols, namely
Push and Pull Modes, in order to enable the required information dissemination
operation. Both analysis and simulation show the advantage of Pull Mode, in
which the information is cached at RSUs to support asynchronous communication.
We further propose a remote reservation service based on the Pull Mode, such
that the CS-selection decision making can utilize the knowledge of EVs'
charging reservation, as published from EVs through RSUs to CSs. Results show
that both the performance at CS and EV sides are further improved based on
using this anticipated information.


title: A young person's guide to mixed Hodge modules

abstract:
  We give a rather informal introduction to the theory of mixed Hodge modules
for young mathematicians.


title: Classical conformality in the Standard Model from Coleman's theory

abstract:
  The classical conformality is one of the possible candidates for explaining
the gauge hierarchy of the Standard Model. We show that it is naturally
obtained from the Coleman's theory on baby universe.


title:
Convergence of a Strang splitting finite element discretization for the
  Schr\"odinger-Poisson equation

abstract:
  Operator splitting methods combined with finite element spatial
discretizations are studied for time-dependent nonlinear Schr\"odinger
equations. In particular, the Schr\"odinger-Poisson equation under homogeneous
Dirichlet boundary conditions on a finite domain is considered. A rigorous
stability and error analysis is carried out for the second-order Strang
splitting method and conforming polynomial finite element discretizations. For
sufficiently regular solutions the classical orders of convergence are
retained, that is, second-order convergence in time and polynomial convergence
in space is proven. The established convergence result is confirmed and
complemented by numerical illustrations.


title: Cryptographic Quantum Bound on Nonlocality

abstract:
  Information causality states that the information obtainable by a receiver
cannot be greater than the communication bits from a sender, even if they
utilize no-signaling resources. This physical principle successfully explains
some boundaries between quantum and post-quantum nonlocal correlations, where
the obtainable information reaches the maximum limit. We show that no-signaling
resources of pure partially entangled states produce randomness (or noise) in
the communication bits, and achievement of the maximum limit is impossible,
i.e., the information causality principle is insufficient for the full
identification of the quantum boundaries already for bipartite settings. The
nonlocality inequalities such as so-called the Tsirelson inequality are
extended to show how such randomness affects the strength of nonlocal
correlations. As a result, a relation followed by most of quantum correlations
in the simplest Bell scenario is revealed. The extended inequalities reflect
the cryptographic principle such that a completely scrambled message cannot
carry information.


title: Global Well-posedness of the Incompressible Magnetohydrodynamics

abstract:
  This paper studies the Cauchy problem of the incompressible
magnetohydrodynamic systems with or without viscosity $\nu$. Under the
assumption that the initial velocity field and the displacement of the initial
magnetic field from a non-zero constant are sufficiently small in certain
weighted Sobolev spaces, the Cauchy problem is shown to be globally well-posed
for all $\nu \geq 0$ and all space dimension $n \geq 2$. Such a result holds
true uniformly in nonnegative viscosity parameter. The proof is based on the
inherent strong null structure of the systems which was first introduced for
incompressible elastodynamics by the second author in \cite{Lei14} and
Alinhac's ghost weight technique.


title:
Radiation Tests of Real-Sized Prototype RPCs for the Future CMS RPC
  Upscope

abstract:
  We report on a systematic study of double-gap and four-gap phenolic resistive
plate chambers (RPCs) for future high-{\eta} RPC triggers in the CMS. In the
present study, we constructed real-sized double-gap and four-gap RPCs with gap
thicknesses of 1.6 and 0.8 mm, respectively, with 2-mm-thick phenolic
high-pressure-laminated (HPL) plates. We examined the prototype RPCs for cosmic
rays and 100 GeV muons provided by the SPS H4 beam line at CERN. We applied
maximum gamma rates of 1.5 kHz cm-2 provided by 137Cs sources at Korea
University and the GIF++ irradiation facility installed at the SPS H4 beam line
to examine the rate capabilities of the prototype RPCs. In contrast to the case
of the four-gap RPCs, we found the relatively high threshold was conducive to
effectively suppressing the rapid increase of strip cluster sizes of muon hits
with high voltage, especially when measuring the narrow-pitch strips. The
gamma-induced currents drawn in the four-gap RPC were about one-fourth of those
drawn in the double-gap RPC. The rate capabilities of both RPC types, proven
through the present testing using gamma-ray sources, far exceeded the maximum
rate expected in the new high-{\eta} endcap RPCs planned for future phase-II
LHC runs.


title:
Gaussian States Minimize the Output Entropy of the One-Mode Quantum
  Attenuator

abstract:
  We prove that Gaussian thermal input states minimize the output von Neumann
entropy of the one-mode Gaussian quantum-limited attenuator for fixed input
entropy. The Gaussian quantum-limited attenuator models the attenuation of an
electromagnetic signal in the quantum regime. The Shannon entropy of an
attenuated real-valued classical signal is a simple function of the entropy of
the original signal. A striking consequence of energy quantization is that the
output von Neumann entropy of the quantum-limited attenuator is no more a
function of the input entropy alone. The proof starts from the majorization
result of De Palma et al., IEEE Trans. Inf. Theory 62, 2895 (2016), and is
based on a new isoperimetric inequality. Our result implies that geometric
input probability distributions minimize the output Shannon entropy of the
thinning for fixed input entropy. Moreover, our result opens the way to the
multimode generalization, that permits to determine both the triple trade-off
region of the Gaussian quantum-limited attenuator and the classical capacity
region of the Gaussian degraded quantum broadcast channel.

categories: quant-ph cs.IT math-ph math.IT math.MP math.PR


title: Token Sliding on Chordal Graphs

abstract:
  Let I be an independent set of a graph G. Imagine that a token is located on
any vertex of I. We can now move the tokens of I along the edges of the graph
as long as the set of tokens still defines an independent set of G. Given two
independent sets I and J, the Token Sliding problem consists in deciding
whether there exists a sequence of independent sets which transforms I into J
so that every pair of consecutive independent sets of the sequence can be
obtained via a token move. This problem is known to be PSPACE-complete even on
planar graphs.
  In 2014, Demaine et al. asked whether the Token Sliding reconfiguration
problem is polynomial time solvable on interval graphs and more generally in
chordal graphs. Yamada and Uehara showed in 2016 that a polynomial time
transformation can be found in proper interval graphs.
  In this paper, we answer the first question of Demaine et al. and generalize
the result of Yamada and Uehara by showing that we can decide in polynomial
time whether two independent sets of an interval graph are in the same
connected component. Moveover, we answer similar questions by showing that: (i)
determining if there exists a token sliding transformation between every pair
of k-independent sets in an interval graph can be decided in polynomial time;
(ii) deciding this problem becomes co-NP-hard and even co-W[2]-hard
(parameterized by the size of the independent set) on split graphs, a sub-class
of chordal graphs.


title:
On densities of lattice arrangements intersecting every i-dimensional
  affine subspace

abstract:
  In 1978, Makai Jr. established a remarkable connection between the
volume-product of a convex body, its maximal lattice packing density and the
minimal density of a lattice arrangement of its polar body intersecting every
affine hyperplane. Consequently, he formulated a conjecture that can be seen as
a dual analog of Minkowski's fundamental theorem, and which is strongly linked
to the well-known Mahler-conjecture.
  Based on the covering minima of Kannan & Lov\'asz and a problem posed by
Fejes T\'oth, we arrange Makai Jr.'s conjecture into a wider context and
investigate densities of lattice arrangements of convex bodies intersecting
every i-dimensional affine subspace. Then it becomes natural also to formulate
and study a dual analog to Minkowski's second fundamental theorem. As our main
results, we derive meaningful asymptotic lower bounds for the densities of such
arrangements, and furthermore, we solve the problems exactly for the special,
yet important, class of unconditional convex bodies.


title: Entanglement Entropy from the Truncated Conformal Space

abstract:
  A new numerical approach to entanglement entropies of the Renyi type is
proposed for one-dimensional quantum field theories. The method extends the
truncated conformal spectrum approach and we will demonstrate that it is
especially suited to study the crossover from massless to massive behavior when
the subsystem size is comparable to the correlation length. We apply it to
different deformations of massless free fermions, corresponding to the scaling
limit of the Ising model in transverse and longitudinal fields. For massive
free fermions the exactly known crossover function is reproduced already in
very small system sizes. The new method treats ground states and excited states
on the same footing, and the applicability for excited states is illustrated by
reproducing Renyi entropies of low-lying states in the transverse field Ising
model.


title: Setup of Order Conditions for Splitting Methods

abstract:
  This article is based on earlier papers where an approach based on Taylor
expansion and the structure of its leading term as an element of a free Lie
algebra was described for the setup of a system of order conditions for
operator splitting methods. Along with a brief review of these materials and
some theoretical background, we discuss the implementation of the ideas from
these papers in computer algebra, in particular using Maple 18. A parallel
version of such a code is described.


title:
Challenges of Security and Trust of Mobile Devices as Digital Avionics
  Component

abstract:
  Mobile devices are becoming part of modern digital avionics. Mobile devices
can be applied to a range of scenarios, from Electronic Flight Bags to
maintenance platforms, in order to manage and configure flight information,
configure avionics networks or perform maintenance tasks (including offloading
flight logs). It can be argued that recent developments show an increased use
of personal mobile devices playing an integral part in the digital avionics
industry. In this paper, we look into different proposals for integrating
mobile devices with various avionics networks -- either as part of the Bring
Your Own Device (BYOD) or Corporate Owned Personally Enabled (COPE) paradigms.
Furthermore, we will evaluate the security and trust challenges presented by
these devices in their respective domains. This analysis will also include the
issues related to communication between the mobile device and the aircraft
network via either wired or wireless channels. Finally, the paper puts forward
a set of guidelines with regards to the security and trust issues that might be
crucial when enabling mobile devices to be part of aircraft networks.


title: Trace identities for skew-symmetric matrices

abstract:
  We derive an expression for the product of the Pfaffians of two
skew-symmetric matrices A and B as a sum of products of the traces of powers of
AB and an expression for the inverse matrix A$^{-1}$, or equivalently B$^{-1}$,
as a finite-order polynomial of AB with coefficients depending on the traces of
powers of AB.


title: Follow Spam Detection based on Cascaded Social Information

abstract:
  In the last decade we have witnessed the explosive growth of online social
networking services (SNSs) such as Facebook, Twitter, RenRen and LinkedIn.
While SNSs provide diverse benefits for example, forstering interpersonal
relationships, community formations and news propagation, they also attracted
uninvited nuiance. Spammers abuse SNSs as vehicles to spread spams rapidly and
widely. Spams, unsolicited or inappropriate messages, significantly impair the
credibility and reliability of services. Therefore, detecting spammers has
become an urgent and critical issue in SNSs. This paper deals with Follow spam
in Twitter. Instead of spreading annoying messages to the public, a spammer
follows (subscribes to) legitimate users, and followed a legitimate user. Based
on the assumption that the online relationships of spammers are different from
those of legitimate users, we proposed classification schemes that detect
follow spammers. Particularly, we focused on cascaded social relations and
devised two schemes, TSP-Filtering and SS-Filtering, each of which utilizes
Triad Significance Profile (TSP) and Social status (SS) in a two-hop subnetwork
centered at each other. We also propose an emsemble technique,
Cascaded-Filtering, that combine both TSP and SS properties. Our experiments on
real Twitter datasets demonstrated that the proposed three approaches are very
practical. The proposed schemes are scalable because instead of analyzing the
whole network, they inspect user-centered two hop social networks. Our
performance study showed that proposed methods yield significantly better
performance than prior scheme in terms of true positives and false positives.


title:
Quasiconformal Teichmuller theory as an analytical foundation for
  two-dimensional conformal field theory

abstract:
  The functorial mathematical definition of conformal field theory was first
formulated approximately 30 years ago. The underlying geometric category is
based on the moduli space of Riemann surfaces with parametrized boundary
components and the sewing operation. We survey the recent and careful study of
these objects, which has led to significant connections with quasiconformal
Teichmuller theory and geometric function theory.
  In particular we propose that the natural analytic setting for conformal
field theory is the moduli space of Riemann surfaces with so-called
Weil-Petersson class parametrizations. A collection of rigorous analytic
results is advanced here as evidence. This class of parametrizations has the
required regularity for CFT on one hand, and on the other hand are natural and
of interest in their own right in geometric function theory.


title: Bandwidth of graphs resulting from the edge clique covering problem

abstract:
  Let $n,k,b$ be integers with $1 \le k-1 \le b \le n$ and let $G_{n,k,b}$ be
the graph whose vertices are the $k$-element subsets $X$ of $\{0,\dots,n\}$
with $\max(X)-\min(X) \le b$ and where two such vertices $X,Y$ are joined by an
edge if $\max(X \cup Y) - \min(X \cup Y) \le b$. These graphs are generated by
applying a transformation to maximal $k$-uniform hypergraphs of bandwidth $b$
that is used to reduce the (weak) edge clique covering problem to a vertex
clique covering problem. The bandwidth of $G_{n,k,b}$ is thus the largest
possible bandwidth of any transformed $k$-uniform hypergraph of bandwidth $b$.
For $b\geq \frac{n+k-1}{2}$, the exact bandwidth of these graphs is determined.
For $b<\frac{n+k-1}{2}$, the bandwidth is asymptotically determined in the case
of $b=o(n)$ and in the case of $b$ growing linearly in $n$ with a factor $\beta
\in (0,0.5]$, where for one case only bounds could be found. It is conjectured
that the upper bound of this open case is the right asymptotic value.


title: Towards a characterization of the uncertainty curve for graphs

abstract:
  Signal processing on graphs is a recent research domain that aims at
generalizing classical tools in signal processing, in order to analyze signals
evolving on complex domains. Such domains are represented by graphs, for which
one can compute a particular matrix, called the normalized Laplacian. It was
shown that the eigenvalues of this Laplacian correspond to the frequencies of
the Fourier domain in classical signal processing. Therefore, the frequency
domain is not the same for every support graph. A consequence of this is that
there is no non-trivial generalization of Heisenberg's uncertainty principle,
that states that a signal cannot be fully localized both in the time domain and
in the frequency domain. A way to generalize this principle, introduced by
Agaskar and Lu, consists in determining a curve that represents a lower bound
on the compromise between precision in the graph domain and precision in the
spectral domain. The aim of this paper is to propose a characterization of the
signals achieving this curve, for a larger class of graphs than the one studied
by Agaskar and Lu.


title:
Fourier Analysis and q-Gaussian Functions: Analytical and Numerical
  Results

abstract:
  It is a consensus in signal processing that the Gaussian kernel and its
partial derivatives enable the development of robust algorithms for feature
detection. Fourier analysis and convolution theory have central role in such
development. In this paper we collect theoretical elements to follow this
avenue but using the q-Gaussian kernel that is a nonextensive generalization of
the Gaussian one. Firstly, we review some theoretical elements behind the
one-dimensional q-Gaussian and its Fourier transform. Then, we consider the
two-dimensional q-Gaussian and we highlight the issues behind its analytical
Fourier transform computation. We analyze the q-Gaussian kernel in the space
and Fourier domains using the concepts of space window, cut-off frequency, and
the Heisenberg inequality.


title:
Symbolic Manipulation of Flows of Nonlinear Evolution Equations, with
  Application in the Analysis of Split-Step Time Integrators

abstract:
  We describe a package realized in the Julia programming language which
performs symbolic manipulations applied to nonlinear evolution equations, their
flows, and commutators of such objects. This tool was employed to perform
contrived computations arising in the analysis of the local error of operator
splitting methods. It enabled the proof of the convergence of the basic method
and of the asymptotical correctness of a defect-based error estimator. The
performance of our package is illustrated on several examples.


title: Gauges and functional measures in quantum gravity I: Einstein theory

abstract:
  We perform a general computation of the off-shell one-loop divergences in
Einstein gravity, in a two-parameter family of path integral measures,
corresponding to different ways of parametrizing the graviton field, and a
two-parameter family of gauges. Trying to reduce the gauge- and
measure-dependence selects certain classes of measures and gauges respectively.
There is a choice of two parameters (corresponding to the exponential
parametrization and the partial gauge condition that the quantum field be
traceless) that automatically eliminates the dependence on the remaining two
parameters and on the cosmological constant. We observe that the divergences
are invariant under a $\mathbf{Z}_2$ "duality" transformation that (in a
particularly important special case) involves the replacement of the densitized
metric by a densitized inverse metric as the fundamental quantum variable. This
singles out a formulation of unimodular gravity as the unique "self-dual"
theory in this class.


title: Interpreting the infinitesimal mathematics of Leibniz and Euler

abstract:
  We apply Benacerraf's distinction between mathematical ontology and
mathematical practice (or the structures mathematicians use in practice) to
examine contrasting interpretations of infinitesimal mathematics of the 17th
and 18th century, in the work of Bos, Ferraro, Laugwitz, and others. We detect
Weierstrass's ghost behind some of the received historiography on Euler's
infinitesimal mathematics, as when Ferraro proposes to understand Euler in
terms of a Weierstrassian notion of limit and Fraser declares classical
analysis to be a "primary point of reference for understanding the
eighteenth-century theories." Meanwhile, scholars like Bos and Laugwitz seek to
explore Eulerian methodology, practice, and procedures in a way more faithful
to Euler's own.
  Euler's use of infinite integers and the associated infinite products is
analyzed in the context of his infinite product decomposition for the sine
function. Euler's principle of cancellation is compared to the Leibnizian
transcendental law of homogeneity. The Leibnizian law of continuity similarly
finds echoes in Euler.
  We argue that Ferraro's assumption that Euler worked with a classical notion
of quantity is symptomatic of a post-Weierstrassian placement of Euler in the
Archimedean track for the development of analysis, as well as a blurring of the
distinction between the dual tracks noted by Bos. Interpreting Euler in an
Archimedean conceptual framework obscures important aspects of Euler's work.
Such a framework is profitably replaced by a syntactically more versatile
modern infinitesimal framework that provides better proxies for his inferential
moves.
  Keywords: Archimedean axiom; infinite product; infinitesimal; law of
continuity; law of homogeneity; principle of cancellation; procedure; standard
part principle; ontology; mathematical practice; Euler; Leibniz


title:
Nonlinearly charged dilatonic black holes and their Brans-Dicke
  counterpart: Energy dependent spacetime

abstract:
  Regarding the wide applications of dilaton gravity in the presence of
electrodynamics, we introduce a suitable Lagrangian for the coupling of dilaton
with gauge field. There are various Lagrangians which show the coupling between
scalar fields and electrodynamics with correct special situations. In this
paper, taking into account conformal transformation of Brans-Dicke theory with
an electrodynamics Lagrangian, we show that how scalar field should couple with
electrodynamics in dilaton gravity. In other words, in order to introduce a
correct Lagrangian of dilaton gravity, one should check at least two
requirements: compatibility with Brans-Dicke theory and appropriate special
situations. Finally, we apply the mentioned method to obtain analytical
solutions of dilaton-Born-Infeld and Brans-Dicke-Born-Infeld theories with
energy dependent spacetime.


title:
Solvent effects on optical excitations of poly para phenylene ethynylene
  studied by QM/MM simulations based on Many-Body Green's Functions Theory

abstract:
  Electronic excitations in dilute solutions of poly para phenylene ethynylene
(poly-PPE) are studied using a QM/MM approach combining many-body Green's
functions theory within the $GW$ approximation and the Bethe-Salpeter equation
with polarizable force field models. Oligomers up to a length of 7.5\,nm (10
repeat units) functionalized with nonyl side chains are solvated in toluene and
water, respectively. After equilibration using atomistic molecular dynamics
(MD), the system is partitioned into a quantum region (backbone) embedded into
a classical (side chains and solvent) environment. Optical absorption
properties are calculated solving the coupled QM/MM system self-consistently
and special attention is paid to the effects of solvents. The model allows to
differentiate the influence of oligomer conformation induced by the solvation
from electronic effects related to local electric fields and polarization. It
is found that the electronic environment contributions are negligible compared
to the conformational dynamics of the conjugated PPE. An analysis of the
electron-hole wave function reveals a sensitivity of energy and localization
characteristics of the excited states to bends in the global conformation of
the oligomer rather than to the relative of phenyl rings along the backbone.


title: Robustness of discrete semifluxons in closed Bose-Hubbard chains

abstract:
  We present the properties of the ground state and low-energy excitations of
Bose-Hubbard chains with a geometry that varies from open to closed and with a
tunable twisted link. In the vicinity of the symmetric $\pi-$flux case the
system behaves as an interacting gas of discrete semifluxons for finite chains
and interactions in the Josephson regime. The energy spectrum of the system is
studied by direct diagonalization and by solving the corresponding
Bogoliubov--de Gennes equations. The atom-atom interactions are found to
enhance the presence of strongly correlated macroscopic superpositions of
semifluxons.


title: Multi30K: Multilingual English-German Image Descriptions

abstract:
  We introduce the Multi30K dataset to stimulate multilingual multimodal
research. Recent advances in image description have been demonstrated on
English-language datasets almost exclusively, but image description should not
be limited to English. This dataset extends the Flickr30K dataset with i)
German translations created by professional translators over a subset of the
English descriptions, and ii) descriptions crowdsourced independently of the
original English descriptions. We outline how the data can be used for
multilingual image description and multimodal machine translation, but we
anticipate the data will be useful for a broader range of tasks.


title: On Generalized Spherical Surfaces in Euclidean Spaces

abstract:
  In the present study we consider the generalized rotational surfaces in
Euclidean spaces. Firstly, we consider generalized spherical curves in
Euclidean $(n+1)-$space $\mathbb{E}^{n+1}$. Further, we introduce some kind of
generalized spherical surfaces in Euclidean spaces $\mathbb{E}^{3}$ and $%
\mathbb{E}^{4}$ respectively. We have shown that the generalized spherical
surfaces of first kind in $\mathbb{E}^{4}$ are known as rotational surfaces,
and the second kind generalized spherical surfaces are known as meridian
surfaces in $\mathbb{E}^{4}$. We have also calculated the Gaussian, normal and
mean curvatures of these kind of surfaces. Finally, we give some examples.


title:
Stochastic parameterization of subgrid-scale processes in coupled
  ocean-atmosphere systems: Benefits and limitations of response theory

abstract:
  A stochastic subgrid-scale parameterization based on the Ruelle's response
theory and proposed in Wouters and Lucarini [2012] is tested in the context of
a low-order coupled ocean-atmosphere model for which a part of the atmospheric
modes are considered as unresolved. A natural separation of the phase-space
into an invariant set and its complement allows for an analytical derivation of
the different terms involved in the parameterization, namely the average, the
fluctuation and the long memory terms. In this case, the fluctuation term is an
additive stochastic noise. Its application to the low-order system reveals that
a considerable correction of the low-frequency variability along the invariant
subset can be obtained, provided that the coupling is sufficiently weak. This
new approach of scale separation opens new avenues of subgrid-scale
parameterizations in multiscale systems used for climate forecasts.


title: Sharper Upper Bounds for Unbalanced Uniquely Decodable Code Pairs

abstract:
  Two sets $A, B \subseteq \{0, 1\}^n$ form a Uniquely Decodable Code Pair
(UDCP) if every pair $a \in A$, $b \in B$ yields a distinct sum $a+b$, where
the addition is over $\mathbb{Z}^n$. We show that every UDCP $A, B$, with $|A|
= 2^{(1-\epsilon)n}$ and $|B| = 2^{\beta n}$, satisfies $\beta \leq 0.4228
+\sqrt{\epsilon}$. For sufficiently small $\epsilon$, this bound significantly
improves previous bounds by Urbanke and Li~[Information Theory Workshop '98]
and Ordentlich and Shayevitz~[2014, arXiv:1412.8415], which upper bound $\beta$
by $0.4921$ and $0.4798$, respectively, as $\epsilon$ approaches $0$.


title: Thin n-in-p planar pixel modules for the ATLAS upgrade at HL-LHC

abstract:
  The ATLAS experiment will undergo a major upgrade of the tracker system in
view of the high luminosity phase of the LHC (HL-LHC) foreseen to start around
2025. Thin planar pixel modules are promising candidates to instrument the new
pixel system, thanks to the reduced contribution to the material budget and
their high charge collection efficiency after irradiation. New designs of the
pixel cells, with an optimized biasing structure, have been implemented in
n-in-p planar pixel productions with sensor thicknesses of 270 um. Using beam
tests, the gain in hit efficiency is investigated as a function of the received
irradiation fluence. The outlook for future thin planar pixel sensor
productions will be discussed, with a focus on thin sensors with a thickness of
100 and 150 um and a novel design with the optimized biasing structure and
small pixel cells (50 um x 50 um and 25 um x 100 um). These dimensions are
foreseen for the new ATLAS read-out chip in 65 nm CMOS technology and the fine
segmentation will represent a challenge for the tracking in the forward region
of the pixel system at HL-LHC. To predict the performance of 50 um x 50 um
pixels at high eta, FE-I4 compatible planar pixel sensors have been studied
before and after irradiation in beam tests at high incidence angle with respect
to the short pixel direction. Results on cluster shapes, charge collection- and
hit efficiency will be shown.


title:
Slipping reconnection in a solar flare observed in high resolution with
  the GREGOR solar telescope

abstract:
  A small flare ribbon above a sunspot umbra in active region 12205 was
observed on November 7, 2014, at 12:00 UT in the blue imaging channel of the
1.5 m GREGOR telescope, using a 1 A Ca II H interference filter. Context
observations from the Atmospheric Imaging Assembly (AIA) onboard the Solar
Dynamics Observatory (SDO), the Solar Optical Telescope (SOT) onboard Hinode,
and the Interface Region Imaging Spectrograph (IRIS) show that this ribbon is
part of a larger one that extends through the neighboring positive polarities
and also participates in several other flares within the active region. We
reconstructed a time series of 140 seconds of Ca II H images by means of the
multiframe blind deconvolution method, which resulted in spatial and temporal
resolutions of 0.1 arcsec and 1 s. Light curves and horizontal velocities of
small-scale bright knots in the observed flare ribbon were measured. Some knots
are stationary, but three move along the ribbon with speeds of 7-11 km/s. Two
of them move in the opposite direction and exhibit highly correlated intensity
changes, which provides evidence of a slipping reconnection at small spatial
scales.


title:
Theoretical study of the effective modulus of a composite considering
  the orientation distribution of the fillers and the weakened interface

abstract:
  In the manufacturing process of a filler-reinforced composite, the fillers in
the matrix are aligned due to the shear flow occurring during the drawing
stage, and the interface between the matrix and the fillers form various
imperfections that lead to debonding and slip under mechanical loading. Hence,
there have been numerous micromechanics studies to predict effective moduli of
the composites in the presence of partial alignment of fillers and interface
imperfections. In this study, we present an improved theory that overcomes two
limitations in the existing micromechanics based approaches. First, we find
that the interface damage tensor, which has been developed to model the
weakened interface between matrix and fillers, has singularities that cause
non-physical predictions (such as infinite or negative effective moduli). We
correct the mathematical mistakes to remove singularities and derive analytic
expressions of the damage tensor for ellipsoidal inclusions. Second, we reveal
that the previous theory on the effective moduli with axisymmetric filler
orientation distribution fails because the longitudinal and transverse moduli
do not converge in the limit of random orientation distribution. With
appropriate corrections, we derive an analytic expression for the orientation
average of arbitrary transversely isotropic 4th order tensor under general
axisymmetric orientation distribution. We apply the improved method to compute
the effective moduli of a representative composite with non-uniform filler
orientation and interface damage.


title: Micro-electromechanical memory bit based on magnetic repulsion

abstract:
  A bistable micro-mechanical system based on magnetic repulsion is presented
exploring its applicability as memory unit where the state of the bit is
encoded in the rest position of a deflected cantilever. The non-linearity
induced on the cantilever can be tuned through the magnetic interaction
intensity between the cantilever magnet and the counter magnet in terms of
geometrical parameters. A simple model provides a sound prediction of the
behavior of the system. Finally we measured the energy required to store a bit
of information on the system that, for the considered protocols, is bounded by
the energy barrier separating the two stable states.