title:
A Formulation of a Matrix Sparsity Approach for the Quantum Ordered
  Search Algorithm

abstract:
  One specific subset of quantum algorithms is Grovers Ordered Search Problem
(OSP), the quantum counterpart of the classical binary search algorithm, which
utilizes oracle functions to produce a specified value within an ordered
database. Classically, the optimal algorithm is known to have a $\log_2 N$
complexity; however, Grovers algorithm has been found to have an optimal
complexity between the lower bound of $((\ln N-1)/\pi \approx 0.221\log_2 N)$
and the upper bound of $0 .433\log_2 N$. We sought to lower the known upper
bound of the OSP. With [E. Farhi et al, arXiv:quant-ph/9901059], we see that
the OSP can be resolved into a translational invariant algorithm to create
quantum query algorithm restraints. With these restraints, one can find Laurent
polynomials for various $k$ -- queries -- and $N$ -- database sizes -- thus
finding larger recursive sets to solve the OSP and effectively reducing the
upper bound. These polynomials are found to be convex functions, allowing one
to make use of convex optimization to find an improvement on the known bounds.
According to [A. Childs et al, arXiv:quant-ph/0608161v1], semidefinite
programming, a subset of convex optimization, can solve the particular problem
represented by the constraints . We were able to implement a program abiding to
their formulation of a semidefinite program (SDP), leading us to find that it
takes an immense amount of storage and time to compute. To combat this setback,
we then formulated an approach to improve results of the SDP using matrix
sparsity. Through the development of this approach, along with an
implementation of a rudimentary solver, we demonstrate how matrix sparsity
reduces the amount of time and storage required to compute the SDP -- overall
ensuring further improvements will likely be made to reach the theorized lower
bound


title: Analytical Signatures and Proper Actions

abstract:
  In this short note we compare Mishchenko's definition of noncommutative
signature for a manifold with proper $G$-action of a discrete, countable group
$G$ with the (more analytical) counterpart defined by Higson and Roe in the
series of articles "Mapping Surgery to Analysis". A generalization of the
coarse index is also addressed.


title: Spin blockade as a probe of Zeeman interactions in hole quantum dots

abstract:
  Spin-orbit coupling is key to all-electrical control of quantum-dot spin
qubits, and is frequently stronger for holes than for electrons. Here we
investigate Pauli spin blockade for two heavy holes in a gated double quantum
dot in an in-plane magnetic field. The interplay of the complex Zeeman and
spin-orbit couplings causes a blockade leakage current anisotropic in the field
direction. The period of the anisotropic leakage is critically dependent on the
relative magnitude of Zeeman interaction terms linear and cubic in the magnetic
field. The current and singlet-triplet exchange splitting can be effectively
adjusted by an appropriate choice of field direction, providing a simple
control variable for quantum information processing and a way of tailoring
magnetic interactions in hole spin qubits.


title: On a resolvent estimate for bidomain operators and its applications

abstract:
  We study bidomain equations that are commonly used as a model to represent
the electrophysiological wave propagation in the heart. We prove existence,
uniqueness and regularity of a strong solution in $L^p$ spaces. For this
purpose we derive an $L^\infty$ resolvent estimate for the bidomain operator by
using a contradiction argument based on a blow-up argument. Interpolating with
the standard $L^2$-theory, we conclude that bidomain operators generate
$C_0$-analytic semigroups in $L^p$ spaces, which leads to construct a strong
solution to a bidomain equation in $L^p$ spaces.


title:
Large-scale all-electron density functional theory calculations using an
  enriched finite element basis

abstract:
  We present a computationally efficient approach to perform large-scale
all-electron density functional theory calculations by enriching the classical
finite element basis with compactly supported atom-centered numerical basis
functions that are constructed from the solution of the Kohn-Sham (KS) problem
for single atoms. We term these numerical basis functions as enrichment
functions, and the resultant basis as the enriched finite element basis. The
enrichment functions are compactly supported through the use of smooth cutoff
functions, which enhances the conditioning and maintains the locality of the
basis. The integrals involved in the evaluation of the discrete KS Hamiltonian
and overlap matrix in the enriched finite element basis are computed using an
adaptive quadrature grid based on the characteristics of enrichment functions.
Further, we propose an efficient scheme to invert the overlap matrix by using a
block-wise matrix inversion in conjunction with special reduced-order
quadrature rules to transform the discrete Kohn-Sham problem to a standard
eigenvalue problem. Finally, we solve the resulting standard eigenvalue problem
by using a Chebyshev polynomial based filtering technique to compute the
relevant eigenspectrum. We demonstrate the accuracy, efficiency and parallel
scalability of the proposed method on semiconducting and heavy-metallic systems
of various sizes, with the largest system containing 8694 electrons. We obtain
accuracies in the ground-state energies that are within $\sim 1$mHa with
ground-state energies obtained from classical finite element as well as
gaussian basis sets. We observe a $50-300$ and $\sim 8$ fold reduction in the
overall computational time when compared to classical finite element and
gaussian basis, respectively. We also observe good parallel scalability up to
384 processors for a benchmark system comprising of 280-atom silicon
nano-cluster.


title: Significance testing in non-sparse high-dimensional linear models

abstract:
  In high-dimensional linear models, the sparsity assumption is typically made,
stating that most of the parameters are equal to zero. Under the sparsity
assumption, estimation and, recently, inference have been well studied.
However, in practice, sparsity assumption is not checkable and more importantly
is often violated; a large number of covariates might be expected to be
associated with the response, indicating that possibly all, rather than just a
few, parameters are non-zero. A natural example is a genome-wide gene
expression profiling, where all genes are believed to affect a common disease
marker. We show that existing inferential methods are sensitive to the sparsity
assumption, and may, in turn, result in the severe lack of control of Type-I
error. In this article, we propose a new inferential method, named CorrT, which
is robust to model misspecification such as heteroscedasticity and lack of
sparsity. CorrT is shown to have Type I error approaching the nominal level for
\textit{any} models and Type II error approaching zero for sparse and many
dense models.
  In fact, CorrT is also shown to be optimal in a variety of frameworks:
sparse, non-sparse and hybrid models where sparse and dense signals are mixed.
Numerical experiments show a favorable performance of the CorrT test compared
to the state-of-the-art methods.


title:
Numerical Simulation of Star Formation by the Bow Shock of the Centaurus
  A Jet

abstract:
  Recent Hubble Space Telescope (HST) observations of the extragalactic radio
source Centaurus A (Cen A) display a young stellar population around the
southwest tip of the inner filament 8.5 kpc from the Cen A galactic center,
with ages in the range of 1-3 Myr. Crockett et al. (2012) argue that the
transverse bow shock of the Cen A jet triggered this star formation as it
impacted dense molecular cores of clouds in the filament. To test this
hypothesis, we perform three-dimensional numerical simulations of induced star
formation by the jet bow shock in the inner filament of Cen A, using a
positivity preserving WENO method to solve the equations of gas dynamics with
radiative cooling. We find that star clusters form inside a bow-shocked
molecular cloud when the maximum initial density of the cloud is > 40 H2
molecules/cm^3. In a typical molecular cloud of mass 10^6 M_sun and diameter
200 pc, approximately 20 star clusters of mass 10^4 M_sun are formed, matching
the HST images.


title:
There's No Comparison: Reference-less Evaluation Metrics in Grammatical
  Error Correction

abstract:
  Current methods for automatically evaluating grammatical error correction
(GEC) systems rely on gold-standard references. However, these methods suffer
from penalizing grammatical edits that are correct but not in the gold
standard. We show that reference-less grammaticality metrics correlate very
strongly with human judgments and are competitive with the leading
reference-based evaluation metrics. By interpolating both methods, we achieve
state-of-the-art correlation with human judgments. Finally, we show that GEC
metrics are much more reliable when they are calculated at the sentence level
instead of the corpus level. We have set up a CodaLab site for benchmarking GEC
output using a common dataset and different evaluation metrics.


title:
On optimal solutions of the constrained $\ell_0$ regularization and its
  penalty problem

abstract:
  The constrained $\ell_0$ regularization plays an important role in sparse
reconstruction. A widely used approach for solving this problem is the penalty
method, of which the least square penalty problem is a special case. However,
the connections between global minimizers of the constrained $\ell_0$ problem
and its penalty problem have never been studied in a systematic way. This work
provides a comprehensive investigation on optimal solutions of these two
problems and their connections. We give detailed descriptions of optimal
solutions of the two problems, including existence, stability with respect to
the parameter, cardinality and strictness. In particular, we find that the
optimal solution set of the penalty problem is piecewise constant with respect
to the penalty parameter. Then we analyze in-depth the relationship between
optimal solutions of the two problems. It is shown that, in the noisy case the
least square penalty problem probably has no common optimal solutions with the
constrained $\ell_0$ problem for any penalty parameter. Under a mild condition
on the penalty function, we establish that the penalty problem has the same
optimal solution set as the constrained $\ell_0$ problem when the penalty
parameter is sufficiently large. Based on the conditions, we further propose
exact penalty problems for the constrained $\ell_0$ problem. Finally, we
present a numerical example to illustrate our main theoretical results.


title:
Multiple risk factor dependence structures: Copulas and related
  properties

abstract:
  Copulas have become an important tool in the modern best practice Enterprise
Risk Management, often supplanting other approaches to modelling stochastic
dependence. However, choosing the `right' copula is not an easy task, and the
temptation to prefer a tractable rather than a meaningful candidate from the
encompassing copulas toolbox is strong. The ubiquitous applications of the
Gaussian copula is just one illuminating example.
  Speaking generally, a `good' copula should conform to the problem at hand,
allow for asymmetry in the domain of definition and exhibit some extent of tail
dependence. In this paper we introduce and study a new class of Multiple Risk
Factor (MRF) copula functions, which we show are exactly such. Namely, the MRF
copulas (1) arise from a number of meaningful default risk specification with
stochastic default barriers, (2) are in general non-exchangeable and (3)
possess a variety of tail dependences. That being said, the MRF copulas turn
out to be surprisingly tractable analytically.


title:
A Decision Support System to Choose Optimal Release Cycle Length in
  Incremental Software Development Environments

abstract:
  In the last few years it has been seen that many software vendors have
started delivering projects incrementally with very short release cycles. Best
examples of success of this approach has been Ubuntu Operating system that has
a 6 months release cycle and popular web browsers such as Google Chrome, Opera,
Mozilla Firefox. However there is very little knowledge available to the
project managers to validate the chosen release cycle length. We propose a
decision support system that helps to validate and estimate release cycle
length in the early development phase by assuming that release cycle length is
directly affected by three factors, (i) choosing right requirements for current
cycle, (ii) estimating proximal time for each requirement, (iii) requirement
wise feedback from last iteration based on product reception, model accuracy
and failed requirements. We have altered and used the EVOLVE technique proposed
by G. Ruhe to select best requirements for current cycle and map it to time
domain using UCP (Use Case Points) based estimation and feedback factors. The
model has been evaluated on both in-house as well as industry projects.


title:
Effects of Homogeneous Plasma on Strong Gravitational Lensing of Kerr
  Black Holes

abstract:
  Considering a Kerr black hole surrounded by the homogenous unmagnetised
plasma medium, we study the strong gravitational lensing on the equatorial
plane of the Kerr black hole. We find that the presence of the uniform plasma
increases the photon-sphere radius $r_{ps}$, the coefficient $\bar{a},\bar{b}$,
the angular position of the relativistic images $\theta_{\infty}$, the
deflection angle $\alpha(\theta)$ and the angular separation $s$. However the
relative magnitudes $r_m$ decrease in presence of the uniform plasma medium. It
is also shown that the impact of the uniform plasma on the effect of strong
gravitational become smaller as the spin of the Kerr black increace in prograde
orbit($a>0$). Especially, for the extreme black hole(a=0.5), the effect of
strong gravitational lensing in homogenous plasma medium is the same as the
case in vacuum for the prograde orbit.


title: Alternative proof of Keith-Zhong self-improvement and connectivity

abstract:
  We find a new proof for the celebrated theorem of Keith and Zhong that a
$(1,p)$-Poincar\'e inequality self-improves to a $(1,p-\epsilon)$-Poincar\'e
inequality. The paper consists of a novel characterization of Poincar\'e
inequalities and then uses it to give an entirely new proof which is closely
related to Muckenhoupt-weights. This new characterization, and the alternative
proof, demonstrate a formal similarity between Muckenhoupt-weights and
Poincar\'e inequalities. The proofs we give are short and somewhat more direct.
With them we can give the first completely transparent bounds for the quantity
of self-improvement and the constants involved. We observe that the quantity of
self-improvement is, for large $p$, directly proportional to $p$, and inversely
proportional to a power of the doubling constant and the constant in the
Poincar\'e inequality. The proofs can be localized and thus we obtain more
transparent proofs of the self-improvement of local Poincar\'e inequalities.


title:
Performance Evaluation of Klystron Beam Focusing System with Anisotropic
  Ferrite Magnet

abstract:
  A klystron beam focusing system using permanent magnets, which increases
reliability in comparison with electromagnet focusing system, is reported. A
prototype model has been designed and fabricated for a 1.3 GHz, 800 kW klystron
for evaluation of the feasibility of the focusing system with permanent
magnets. In order to decrease the production cost and to mitigate complex
tuning processes of the magnetic field, anisotropic ferrite magnet is adopted
as the magnetic material. As the result of a power test, 798 kW peak output
power was successfully achieved with the prototype focusing system. Considering
a power consumption of the electromagnet focusing system, the required
wall-plug power to produce nominal 800 kW output power with the permanent
magnet system is less than that with electromagnet. However, the power
conversion efficiency of the klystron with the permanent magnet system was
found to be limited by transverse multipole magnetic fields. By decreasing
transverse multipole magnetic field components, especially the dipole and the
quadrupole, the power conversion efficiency would approach to that with
electromagnets.


title:
Minority Games With Applications to Distributed Decision Making and
  Control in Wireless Networks

abstract:
  Fifth generation (5G) dense small cell networks (SCNs) are expected to meet
the thousand-fold mobile traffic challenge within the next few years. When
developing solution schemes for resource allocation problems in such networks,
conventional centralized control is no longer viable due to excessive
computational complexity and large signaling overhead caused by the large
number of users and network nodes in such a network. Instead, distributed
resource allocation (or decision making) methods with low complexity would be
desirable to make the network self-organizing and autonomous. Minority game
(MG) has recently gained attention of the research community as a tool to model
and solve distributed resource allocation problems. The main objective of this
article is to study the applicability of the MG to solve the distributed
decision making problems in future wireless networks. We present the
fundamental theoretical aspects of basic MG, some variants of MG, and the
notion of equilibrium. We also study the current state-of-the-art on the
applications of MGs in communication networks. Furthermore, we describe an
example application of MG to SCNs, where the problem of computation offloading
by users in an SCN is modeled and analyzed using MG.


title: QSGD: Communication-Efficient SGD via Gradient Quantization and Encoding

abstract:
  Parallel implementations of stochastic gradient descent (SGD) have received
significant research attention, thanks to excellent scalability properties of
this algorithm, and to its efficiency in the context of training deep neural
networks. A fundamental barrier for parallelizing large-scale SGD is the fact
that the cost of communicating the gradient updates between nodes can be very
large. Consequently, lossy compression heuristics have been proposed, by which
nodes only communicate quantized gradients. Although effective in practice,
these heuristics do not always provably converge, and it is not clear whether
they are optimal.
  In this paper, we propose Quantized SGD (QSGD), a family of compression
schemes which allow the compression of gradient updates at each node, while
guaranteeing convergence under standard assumptions. QSGD allows the user to
trade off compression and convergence time: it can communicate a sublinear
number of bits per iteration in the model dimension, and can achieve
asymptotically optimal communication cost. We complement our theoretical
results with empirical data, showing that QSGD can significantly reduce
communication cost, while being competitive with standard uncompressed
techniques on a variety of real tasks.
  In particular, experiments show that gradient quantization applied to
training of deep neural networks for image classification and automated speech
recognition can lead to significant reductions in communication cost, and
end-to-end training time. For instance, on 16 GPUs, we are able to train a
ResNet-152 network on ImageNet 1.8x faster to full accuracy. Of note, we show
that there exist generic parameter settings under which all known network
architectures preserve or slightly improve their full accuracy when using
quantization.


title:
The split feasibility and fixed point equality problems for
  quasi-nonexpansive mappings in Hilbert spaces

abstract:
  In this paper, we introduce a new problem called the split feasibility and
fixed point equality problems (SFFPEP) and propose a new iterative algorithm
for solving the problem (SFFPEP) for the class of quasi-nonexpansive mappings
in Hilbert spaces. Furthermore, we study the convergence of the proposed
algorithm. At the end, we give numerical example that illustrate our
theoretical result. The SFFPEP is a generalization of the split feasibility
problem (SFP), split feasibility and fixed point problems (SFFPP) and split
equality fixed point problem (SEFPP).


title:
Loop Quantum Gravity, Exact Holographic Mapping, and Holographic
  Entanglement Entropy

abstract:
  The relation between Loop Quantum Gravity (LQG) and tensor network is
explored from the perspectives of bulk-boundary duality and holographic
entanglement entropy. We find that the LQG spin-network states in a space
$\Sigma$ with boundary $\partial\Sigma$ is an exact holographic mapping similar
to the proposal in arXiv:1309.6282. The tensor network, understood as the
boundary quantum state, is the output of the exact holographic mapping emerging
from a coarse graining procedure of spin-networks. Furthermore, when a region
$A$ and its complement $\bar{A}$ are specified on the boundary
$\partial\Sigma$, we show that the boundary entanglement entropy $S(A)$ of the
emergent tensor network satisfies the Ryu-Takayanagi formula in the
semiclassical regime, i.e. $S(A)$ is proportional to the minimal area of the
bulk surface attached to the boundary of $A$ in $\partial\Sigma$.


title: Beam Characterization at the KAERI UED Beamline

abstract:
  The UED (ultrafast electron diffraction) beamline of the KAERI's (the Korea
Atomic Energy Research Institute's) WCI (World Class Institute) Center has been
successfully commissioned. We have measured the beam emittance by using the
quadrupole scan technique and the charge by using a novel measurement system we
have developed. In the quadrupole scan, a larger drift distance between the
quadrupole and the screen is preferred because it gives a better thin-lens
approximation. A high bunch-charge beam, however, will undergo emittance growth
in the long drift caused by the space-charge force. We present a method that
mitigates this growth by introducing a quadrupole scan with a short drift and
without using the thin-lens approximation. The quadrupole in this method is
treated as a thick lens, and the emittance is extracted by using the thick-lens
equations. Apart from being precise, our method can be readily applied without
making any change to the beamline and has no need for a big drift space. For
charge measurement, we have developed a system consisting of an in-air Faraday
cup (FC) and a preamplifier. Tests performed utilizing 3.3-MeV electrons show
that the system was able to measure bunches with pulse durations of tens of
femtoseconds at 10 fC sensitivity.


title:
A Baseline for Detecting Misclassified and Out-of-Distribution Examples
  in Neural Networks

abstract:
  We consider the two related problems of detecting if an example is
misclassified or out-of-distribution. We present a simple baseline that
utilizes probabilities from softmax distributions. Correctly classified
examples tend to have greater maximum softmax probabilities than erroneously
classified and out-of-distribution examples, allowing for their detection. We
assess performance by defining several tasks in computer vision, natural
language processing, and automatic speech recognition, showing the
effectiveness of this baseline across all. We then show the baseline can
sometimes be surpassed, demonstrating the room for future research on these
underexplored detection tasks.


title:
Uniform positivity of the Lyapunov exponent for monotone potentials
  generated by the doubling map

abstract:
  We show that for any doubling map generated $C^1$ monotone potential with
derivative uniformly bounded away from zero, the Lyapunov exponent of the
associated Schr\"odinger operators is uniformly positive for all energies
provided the coupling constant is large.


title: A Highly Adjustable Helical Beam: Design and Propagation Characteristic

abstract:
  Light fields with extraordinary propagation behaviours such as nondiffracting
and self-bending are useful in optical delivery for energy, information, and
even objects. A kind of helical beams is constructed here based on the caustic
method. With appropriate design, the main lobe of these helical beams can be
both well-confined and almost nondiffracting while moving along a helix with
its radius, period, the number of rotations and main lobes highly adjustable.
In addition, the main lobe contains almost half of the optical power and the
peak intensity fluctuates below 15% during propagation. These promising
characteristics may enable a variety of potential applications based on these
beams.


title: Active Fault Tolerant Flight Control System Design

abstract:
  In this paper we investigate the design of an active fault tolerant control
system applicable to autonomous flight. The system comprises a nonlinear model
predictive based controller integrated with an unscented Kalman filter for
fault detection and identification. We apply the fault tolerant control system
design to a generic aircraft model, and simulate a failed engine scenario. The
results show that the system correctly identifies the fault within seconds of
occurrence and updates the nonlinear model predictive controller which is then
able to reallocate control authority to the healthy actuators based upon up to
date fault information.


title: Quantum walks in commensurate off-diagonal Aubry-Andr\'{e}-Harper model

abstract:
  Due to the topological nature of Aubry-Andr\'{e}-Harper (AAH) model, exotic
edge states have been found existing in one-dimensional periodic and
quasiperiodic lattices. In this article, we investigate continuous-time quantum
walks of identical particles initially located on either edge of commensurate
AAH lattices in detail. It is shown that the quantum walker is delocalized
among the whole lattice until the strength of periodic modulation is strong
enough. The inverse participation ratios (IPRs) for all of the eigenstates are
calculated. It is found that the localization properties of the quantum walker
is mainly determined by the IPRs of the topologically protected edge states.
More interestingly, the edge states are shown to have an exotic
`\emph{repulsion}' effect on quantum walkers initiated from the lattice sites
inside the bulk. Furthermore, we examine the role of nearest-neighbour
interaction on the quantum walks of two identical fermions. Clear enhancement
of the `\emph{repulsion}' effect by strong interaction has been shown.


title: How does interference fall?

abstract:
  We study how single- and double-slit interference patterns fall in the
presence of gravity. First, we demonstrate that universality of free fall still
holds in this case, i.e., interference patterns fall just like classical
objects. Next, we explore lowest order relativistic effects in the Newtonian
regime by employing a recent quantum formalism which treats mass as an
operator. This leads to interactions between non-degenerate internal degrees of
freedom (like spin in an external magnetic field) and external degrees of
freedom (like position). Based on these effects, we present an unusual
phenomenon, in which a falling double slit interference pattern periodically
decoheres and recoheres. The oscillations in the visibility of this
interference occur due to correlations built up between spin and position.
Finally, we connect the interference visibility revivals with non-Markovian
quantum dynamics.


title:
Symmetries and hybridization in the indirect interaction between
  magnetic moments in MoS$_{2}$ nanoflakes

abstract:
  We study the Ruderman-Kittel-Kasuya-Yosida interaction between magnetic
impurities embedded in $p$-doped transition metal dichalcogenide triangular
flakes. The role of underlying symmetries is exposed by analyzing the
interaction as a function of impurity separation along zigzag and armchair
trajectories, in specific parts of the sample. The large spin-orbit coupling in
these materials produces strongly anisotropic interactions, including a
Dzyaloshinskii-Moriya component that can be sizable and tunable. We consider
impurities hybridized to different orbitals of the host transition-metal and
identify specific characteristics for onsite and hollow site adsorption. In the
onsite case, the different components of the interaction have similar
magnitude, while for the hollow site, the Ising component dominates. We also
study the dependence of the interaction with the level of hole doping, which
supplies a further degree of tunability. Our results could provide ways of
controlling helical long range spin order in magnetic impurity arrays embedded
in these materials.


title:
Stochastic Averaging for Constrained Optimization with Application to
  Online Resource Allocation

abstract:
  Existing approaches to resource allocation for nowadays stochastic networks
are challenged to meet fast convergence and tolerable delay requirements. The
present paper leverages online learning advances to facilitate stochastic
resource allocation tasks. By recognizing the central role of Lagrange
multipliers, the underlying constrained optimization problem is formulated as a
machine learning task involving both training and operational modes, with the
goal of learning the sought multipliers in a fast and efficient manner. To this
end, an order-optimal offline learning approach is developed first for batch
training, and it is then generalized to the online setting with a procedure
termed learn-and-adapt. The novel resource allocation protocol permeates
benefits of stochastic approximation and statistical learning to obtain
low-complexity online updates with learning errors close to the statistical
accuracy limits, while still preserving adaptation performance, which in the
stochastic network optimization context guarantees queue stability. Analysis
and simulated tests demonstrate that the proposed data-driven approach improves
the delay and convergence performance of existing resource allocation schemes.


title: Lightweight User-Space Record And Replay

abstract:
  The ability to record and replay program executions with low overhead enables
many applications, such as reverse-execution debugging, debugging of
hard-to-reproduce test failures, and "black box" forensic analysis of failures
in deployed systems. Existing record-and-replay approaches rely on recording an
entire virtual machine (which is heavyweight), modifying the OS kernel (which
adds deployment and maintenance costs), or pervasive code instrumentation
(which imposes significant performance and complexity overhead). We
investigated whether it is possible to build a practical record-and-replay
system avoiding all these issues. The answer turns out to be yes --- if the CPU
and operating system meet certain non-obvious constraints. Fortunately modern
Intel CPUs, Linux kernels and user-space frameworks meet these constraints,
although this has only become true recently. With some novel optimizations, our
system RR records and replays real-world workloads with low overhead with an
entirely user-space implementation running on stock hardware and operating
systems. RR forms the basis of an open-source reverse-execution debugger seeing
significant use in practice. We present the design and implementation of RR,
describe its performance on a variety of workloads, and identify constraints on
hardware and operating system design required to support our approach.


title: Smoothed nonparametric tests and their properties

abstract:
  In this paper we propose new smoothed sign and Wilcoxon's signed rank tests,
which are based on a kernel estimator of the underlying distribution function
of data. We discuss approximations of $p$-values and asymptotic properties of
these tests. The new smoothed tests are equivalent to the ordinary sign and
Wilcoxon's tests in the sense of the Pitman's asymptotic relative efficiency,
and the differences of the ordinary and the new tests converge to zero in
probability. Under the null hypothesis, the main terms of the asymptotic
expectations and variances of the tests do not depend on the underlying
distribution. Though the smoothed tests are not distribution-free, we can
obtain Edgeworth expansions with residual term $o(n^{-1})$, which do not depend
on the underlying distribution.


title:
Modelling the thermal X-ray emission around the Galactic centre from
  colliding Wolf-Rayet winds

abstract:
  The Galactic centre is a hotbed of astrophysical activity, with the injection
of wind material from $\sim$30 massive Wolf-Rayet (WR) stars orbiting within
12" of the super-massive black hole (SMBH) playing an important role.
Hydrodynamic simulations of such colliding and accreting winds produce a
complex density and temperature structure of cold wind material shocking with
the ambient medium, creating a large reservoir of hot, X-ray-emitting gas. This
work aims to confront the 3Ms of Chandra X-ray Visionary Program (XVP)
observations of this diffuse emission by computing the X-ray emission from
these hydrodynamic simulations of the colliding WR winds, amid exploring a
variety of SMBH feedback mechanisms. The major success of the model is that it
reproduces the spectral shape from the 2"--5" ring around the SMBH, where most
of the stellar wind material that is ultimately captured by Sgr A* is
shock-heated and thermalised. This naturally explains that the hot gas comes
from colliding WR winds, and that the wind speeds of these stars are in general
well constrained. The flux level of these spectra, as well as 12"$\times$12"
images of 4--9 keV, show the X-ray flux is tied to the SMBH feedback strength;
stronger feedback clears out more hot gas, thereby decreasing the thermal X-ray
emission. The model in which Sgr A* produced an intermediate-strength outflow
during the last few centuries best matches the observations to within about
10%, showing SMBH feedback is required to interpret the X-ray emission in this
region.


title:
Analysis of BaBar, Belle, BES-II, CLEO and KEDR data on $\psi(3770)$
  line shape and determination of the resonance parameters

abstract:
  The available data on the $D\overline{D}$ and inclusive hadronic cross
sections in the $\psi(3770)$ region from the BaBar, Belle, BES-II, CLEO and
KEDR experiments have been analyzed assuming that systematic uncertainties on
cross sections measured by different detectors are not correlated. Four
theoretical models predicting the $\psi(3770)$ line shape were considered for
the $D\overline{D}$ channel. All of them gave satisfactory description of the
data. The combined analysis of the $D\overline{D}$ and inclusive hadronic
channel was performed using the model based on the vector dominance approach
and accounting for the contribution of the $\psi(2S)$ tail to the
$D\overline{D}$ cross section. The following values of the mass, total width,
electron width and decay probability to the non-$D\overline{D}$ states were
obtained: $M=3779.8 \pm 0.6 ~\text{MeV}, \Gamma=25.8 \pm 1.3 ~\text{MeV} ,
\Gamma_{ee}=196 \pm 18 ~\text{eV}, \mathcal{B}_{nD\overline{D}}=0.164 \pm
0.049$, where the errors quoted include both statistical and dominant
systematic uncertainties.


title:
Double Resonance in Dalitz Plot of M(pLambda)-M(KLambda) in DISTO Data
  on p+p rightarrow p+Lambda+K+ at 2.85 GeV

abstract:
  The X(2265) resonance was previously observed in DISTO data of p+p rightarrow
p+Lambda+K+ at 2.85 GeV on an attempt of searching for the kaonic nuclear state
K-pp rightarrow p + Lambda. In the present paper we report an additional
finding, namely, a double resonance type phenomena, not only with a peak at
M(pLambda) = 2265 MeV/c2 but also a broad bump at M(K+ Lambda) ~ 1700 MeV/c2.
This "double-resonance" zone is expressed as XY(2265, 1700). The latter bump
may result from nearby nucleon resonances, typically N*(1710), as well as by
attractive K - Lambda final-state interaction. We point out that this double
resonance XY(2265, 1700) as seen in DISTO at 2.85 GeV cannot be populated
kinematically in a HADES experiment at 3.5 GeV.


title:
Feasibility study for the measurement of $\pi N$ TDAs at PANDA in
  $\bar{p}p\to J/\psi\pi^0$

abstract:
  The exclusive charmonium production process in $\bar{p}p$ annihilation with
an associated $\pi^0$ meson $\bar{p}p\to J/\psi\pi^0$ is studied in the
framework of QCD collinear factorization. The feasibility of measuring this
reaction through the $J/\psi\to e^+e^-$ decay channel with the PANDA
(AntiProton ANnihilation at DArmstadt) experiment is investigated. Simulations
on signal reconstruction efficiency as well as the background rejection from
various sources including the $\bar{p}p\to\pi^+\pi^-\pi^0$ and $\bar{p}p\to
J/\psi\pi^0\pi^0$ reactions are performed with PandaRoot, the simulation and
analysis software framework of the PANDA experiment. It is shown that the
measurement can be done at PANDA with significant constraining power under the
assumption of an integrated luminosity attainable in four to five months of
data taking at the maximum design luminosity.


title: K-K-pp - an important gateway toward multi-kaonic nuclei

abstract:
  Based on our Faddeev-Yakubowsky calculations of four-body kaonic nuclear
systems it was revealed that the structure of K-K-pp is well approximated by
two Lambda*=K-p's with strong mutual attraction. It is vitally important to
study this nucleus, as it is an essential gateway toward multi-Lambda* nuclei.
Two experimental proposals are presented: i) production of K-K-pp by p+p
reactions at T_p = 7 GeV, and ii) search for K-K-pp from the invariant mass of
M(Lambda-Lambda) around 2.6 GeV/c2 in high-energy HI reactions.


title: A Chiral Solution to the Ginsparg-Wilson Equation

abstract:
  We present a chiral solution of the Ginsparg-Wilson equation. This work is
motivated by our recent proposal for nonperturbatively regulating chiral gauge
theories, where five-dimensional domain wall fermions couple to a
four-dimensional gauge field that is extended into the extra dimension as the
solution to a gradient flow equation. Mirror fermions at the far surface
decouple from the gauge field as if they have form factors that become
infinitely soft as the distance between the two surfaces is increased. In the
limit of an infinite extra dimension we derive an effective four-dimensional
chiral overlap operator which is shown to obey the Ginsparg-Wilson equation,
and which correctly reproduces a number of properties expected of chiral gauge
theories in the continuum.


title: Reconstructing open quantum system dynamics with limited control

abstract:
  The dynamics of an open quantum system can be fully described and
tomographically reconstructed if the experimenter has complete control over the
system of interest. Most real-world experiments do not fulfill this assumption,
and the amount of control is restricted by the experimental set-up. That is,
the set of performable manipulations of the system is limited. For instance,
imagine a set-up where unitary operations are easy to make, but only one
measurement at the end of the experiment is allowed. In this paper, we provide
a general reconstruction scheme that yields operationally well-defined dynamics
for any conceivable kind of experimental situation. If one additional operation
can be performed, these `restricted' dynamics allow for the construction of
witnesses for initial correlations and the presence of memory effects. We
demonstrate the applicability of our framework for the the two important cases
where the set of performable operations comprises only unitary operations or
projective measurements, respectively, and show that it provides a powerful
tool for the description of quantum control experiments.


title:
Distribution of singular values of random band matrices;
  Marchenko-Pastur law and more

abstract:
  We consider the limiting spectral distribution of matrices of the form
$\frac{1}{2b_{n}+1} (R + X)(R + X)^{*}$, where $X$ is an $n\times n$ band
matrix of bandwidth $b_{n}$ and $R$ is a non random band matrix of bandwidth
$b_{n}$. We show that the Stieltjes transform of ESD of such matrices converges
to the Stieltjes transform of a non-random measure. And the limiting Stieltjes
transform satisfies an integral equation. For $R=0$, the integral equation
yields the Stieltjes transform of the Marchenko-Pastur law.


title: Quantum Monte Carlo simulation of topological phase transitions

abstract:
  We study the electron-electron interaction effects on topological phase
transitions by the ab-initio quantum Monte Carlo simulation. We analyze
two-dimensional class A topological insulators and three-dimensional Weyl
semimetals with the long-range Coulomb interaction. The direct computation of
the Chern number shows the electron-electron interaction modifies or
extinguishes topological phase transitions.


title: Lattice QCD simulation of the Berry curvature

abstract:
  The Berry curvature is a fundamental concept describing topological order of
quantum systems. While it can be analytically tractable in non-interacting
systems, numerical simulations are necessary in interacting systems. We present
a formulation to calculate the Berry curvature in lattice QCD.


title:
Motion of Satellite under the Effect of Oblateness of Earth and
  Atmospheric Drag

abstract:
  The equations governing motion of the satellite under the effect of
oblateness of Earth and atmospheric drag have been simulated, for a fixed
initial position and three different initial velocities, till satellite
collapses on Earth. Simulation of motion of artificial Earth satellite subject
to the combined effects of oblate Earth and atmospheric drag is presented. The
atmospheric model considered here takes in to account of exponential variation
of the density with initial distance of Satellite from Earth's surface, scale
height and radial distance. The minimum and maximum values of orbital elements
and their variation over a time for different initial velocities have been
reported.


title: Quantitative Diophantine approximation on affine subspaces

abstract:
  Recently, Adiceam, Beresnevich, Levesley, Velani and Zorin proved a
quantitative version of the convergence case of the Khintchine-Groshev theorem
for nondegenerate manifolds, motivated by applications to interference
alignment. In the present paper, we obtain analogues of their results for
affine subspaces.


title:
On reducible monodromy representations of some generalized Lam\'e
  equation

abstract:
  In this note, we compute the explicit formula of the monodromy data for a
generalized Lam\'{e} equation when its monodromy is reducible but not
completely reducible. We also solve the corresponding Riemman-Hilbert problem.


title: Nonharmonic analysis of boundary value problems without WZ condition

abstract:
  In this work we continue our research on nonharmonic analysis of boundary
value problems as initiated in our recent paper (IMRN 2016). There, we assumed
that the eigenfunctions of the model operator on which the construction is
based do not have zeros. In this paper we have weakened this condition
extending the applicability of the developed pseudo-differential analysis.
Also, we do not assume that the underlying set is bounded.


title: States on sharply dominating effect algebras

abstract:
  We prove that Archimedean sharply dominating atomic lattice effect algebras
can be characterized by property called basic decomposition of elements. As an
application we prove the state smearing theorem for these effect algebras.


title: On Diophantine transference principles

abstract:
  We provide an extension of the transference results of Beresnevich and Velani
connecting homogeneous and inhomogeneous Diophantine approximation on manifolds
and provide bounds for inhomogeneous Diophantine exponents of affine subspaces
and their nondegenerate submanifolds.


title:
Unsaturated magnetoconductance of epitaxial La0.7Sr0.3MnO3 thin films in
  pulsed magnetic fields up to 60 T

abstract:
  We report on the temperature and field dependence of resistance of
La0.7Sr0.3MnO3 thin films over a wide temperature range and in pulsed magnetic
fields up to 60 T. The epitaxial La0.7Sr0.3MnO3 thin films were deposited by
laser molecular beam epitaxy. High magnetic field magnetoresistance curves were
fitted by the Brillouin function, which indicated the existence of magnetically
polarized regions and the underlying hopping mechanism. The unsaturated
magnetoconductance was the most striking finding observed in pulsed magnetic
fields up to 60 T. These observations can deepen the fundamental understanding
of the colossal magnetoresistance in manganites with strong correlation of
transport properties and magnetic ordering.


title:
Self-Guiding of Electromagnetic Beams in Degenerate Relativistic
  Electron-Positron Plasma

abstract:
  The possibility of self-trapped propagation of electromagnetic beams in the
fully degenerate relativistic electron-positron plasma has been studied
applying Fluid-Maxwell model; it is shown that dynamics of such beams can be
described by the generalized Nonlinear Schr\"odinger equation with specific
type of saturating nonlinearity. Existence of radially symmetric localized
solitary structures is demonstrated. It is found that stable solitary
structures exist for the arbitrary level of degeneracy.


title: Deep Reinforcement Learning From Raw Pixels in Doom

abstract:
  Using current reinforcement learning methods, it has recently become possible
to learn to play unknown 3D games from raw pixels. In this work, we study the
challenges that arise in such complex environments, and summarize current
methods to approach these. We choose a task within the Doom game, that has not
been approached yet. The goal for the agent is to fight enemies in a 3D world
consisting of five rooms. We train the DQN and LSTM-A3C algorithms on this
task. Results show that both algorithms learn sensible policies, but fail to
achieve high scores given the amount of training. We provide insights into the
learned behavior, which can serve as a valuable starting point for further
research in the Doom domain.


title:
Quasi Hyperrigidity and Weak Peak Points for Non-Commutative Operator
  Systems

abstract:
  In this article, we introduce the notions of weak boundary repre- sentation,
quasi hyperrigidity and weak peak points in the non-commutative setting for
operator systems in C* algebras. An analogue of Saskin theorem relating quasi
hyperrigidity and weak Choquet boundary for particular classes of C* algebras
is proved. We also show that, if an irreducible representation is a weak
boundary representation and weak peak then it is a boundary repre- sentation.
Several examples are provided to illustrate these notions. It is also observed
that isometries on Hilbert spaces play an important role in the study of
certain operator systems.


title:
Transitively-Saturated Property, Banach Recurrence and Lyapunov
  Regularity

abstract:
  The topological entropy of various gap-sets on periodic-like recurrence and
Birkhoff regularity were considered in [69] but some Banach recurrence and
Lyapunov regularity are not considered.
  In this paper we introduce five new levels on Banach recurrence and show they
all carry full topological entropy, and simultaneously combine with Lyapunov
regularity to get some refined theory on mixed multifractal analysis of [8,29].
  In this process, we strengthen Pfister and Sullivan's result of [58] from
saturated property to transitively-saturated property (and from
single-saturated property to transitively-convex-saturated property).


title: Schatten properties of Toeplitz operators on the Paley-Wiener space

abstract:
  We collect several old and new descriptions of Schatten class Toeplitz
operators on the Paley-Wiener space and answer a question on discrete Hilbert
transform commutators posed by Richard Rochberg.


title:
Variability of stellar granulation and convective blueshift with
  spectral type and magnetic activity. I. K and G main sequence stars

abstract:
  In solar-type stars, the attenuation of convective blueshift by stellar
magnetic activity dominates the RV variations over the low amplitude signal
induced by low mass planets. Models of stars that differ from the Sun will
require a good knowledge of the attenuation of the convective blueshift to
estimate its impact on the variations. It is therefore crucial to precisely
determine not only the amplitude of the convective blueshift for different
types of stars, but also the dependence of this convective blueshift on
magnetic activity, as these are key factors in our model producing the RV. We
studied a sample of main sequence stars with spectral types from G0 to K2 and
focused on their temporally averaged properties: the activity level and a
criterion allowing to characterise the amplitude of the convective blueshift.
We find the differential velocity shifts of spectral lines due to convection to
depend on the spectral type, the wavelength (this dependence is correlated with
the Teff and activity level), and on the activity level. This allows us to
quantify the dependence of granulation properties on magnetic activity for
stars other than the Sun. The attenuation factor of the convective blueshift
appears to be constant over the considered range of spectral types. We derive a
convective blueshift which decreases towards lower temperatures, with a trend
in close agreement with models for Teff lower than 5800 K, but with a
significantly larger global amplitude. We finally compare the observed RV
variation amplitudes with those that could be derived from our convective
blueshift using a simple law and find a general agreement on the amplitude. Our
results are consistent with previous results and provide, for the first time,
an estimation of the convective blueshift as a function of Teff, magnetic
activity, and wavelength, over a large sample of G and K main sequence stars.


title: Wigner crystal phases in confined carbon nanotubes

abstract:
  We present a detailed theoretical analysis of the Wigner crystal states in
confined semiconducting carbon nanotubes. We show by robust scaling arguments
as well as by detailed semi-microscopic calculations that the effective
exchange interaction has an SU(4) symmetry, and can reach values even as large
as $J\sim 100 {\rm \,K}$ in weakly screened, small diameter nanotubes, close to
the Wigner crystal - electron liquid crossover. Modeling the nanotube carefully
and analyzing the magnetic structure of the inhomogeneous electron crystal, we
recover the experimentally observed 'phase boundaries' of Deshpande and
Bockrath [V. V. Deshpande and M. Bockrath, Nature Physics $\mathbf 4$, 314
(2008)]. Spin-orbit coupling only slightly modifies these phase boundaries, but
breaks the spin symmetry down to SU(2)$\times$SU(2), and in Wigner molecules it
gives rise to interesting excitation spectra, reflecting the underlying SU(4)
as well as the residual SU(2)$\times$SU(2) symmetries.


title: Iterative regularization via dual diagonal descent

abstract:
  In the context of linear inverse problems, we propose and study a general
iterative regularization method allowing to consider large classes of
regularizers and data-fit terms. The algorithm we propose is based on a
primal-dual diagonal {descent} method. Our analysis establishes convergence as
well as stability results. Theoretical findings are complemented with numerical
experiments showing state of the art performances.


title: The Landau-Ginzburg-Wilson Hamiltonian for the Griffiths phase

abstract:
  The Landau-Ginzburg-Wilson Hamiltonian with random temperature for the phase
transition in disordered systems from the Griffiths phase to ferromagnetic
phase is reexamined. From the saddle point solutions, especially the excited
state solutions, it is shown that the system self-organizes into blocks coupled
with their neighbors like superspins, which are emergent variables. Taking the
fluctuation around these saddle point solutions into account, we get an
effective Hamiltonian, including the emergent superspins of the blocks, the
fluctuation around the saddle point solutions, and their couplings. Applying
Stratonovich-Hubbard transformation to the part of superspins, we get a
Landau-Ginzburg-Wilson Hamiltonian for the blocks. From the saddle point
equations for the blocks, we can get the second generation blocks, of which
sizes are much larger than the first generation blocks. Repeating this
procedure again and again, we get many generations of blocks to describe the
asymptotic behavior. If a field is applied, the effective field on the
superspins is multiplied greatly and proportional to the block size. For a very
small field, the effective field on the higher generation superspins can be so
strong to cause the superspins polarizaed radically. This can explain the extra
large critical isotherm exponent discovered in the experiments. The phase space
of reduced temperature vs. field is divided into many layers , in which
different generation blocks dominate the critical behavior. The sizes of the
different generation emergent blocks are new relevant length scales. This can
explain a lot of puzzles in the experiments and the Monte Carlo simulation.


title:
Skyrmions and multi-sublattice helical states in a frustrated chiral
  magnet

abstract:
  We investigate the existence and stability of skyrmions in a frustrated
chiral ferromagnet by considering the competition between ferromagnetic (FM)
nearest-neighbour (NN) interaction ($J_1$) and antiferromagnetic (AFM)
next-nearest-neighbour (NNN) interaction ($J_2$). Contrary to the general
wisdom that long-range ferromagnetic order is not energy preferable under
frustration, the skyrmion lattice not only exists but is even stable for a
large field range when $J_2 \leq J_1$ compared with frustration-free systems.
We defend that the enlargement of stability window of skyrmions is a
consequence of the reduced effective exchange interaction caused by the
frustration. A multi-sublattice helical state is found below the skyrmion
phase, which results from the competition between AFM coupling that favors a
two-sublattice N\'{e}el state and the chiral interaction that prefers a helix.
As a byproduct, the hysteresis loop of the frustrated chiral system shrinks as
the magnetization goes to zero and then opens up again, known as wasp-waist
hysteresis loop. The critical field that separates the narrow and wide part of
the wasp-waist loop depends exponentially on the strength of NNN coupling. By
measuring the critical field, it is possible to determine the strength of NNN
coupling.


title:
The Clusters AgeS Experiment (CASE). Variable stars in the field of the
  globular cluster NGC 362

abstract:
  The field of the globular cluster NGC 362 was monitored between 1997 and 2015
in a search for variable stars. BV light curves were obtained for 151 periodic
or likely periodic variables, over a hundred of which are new detections.
Twelve newly detected variables are proper motion members of the cluster: two
SX Phe and two RR Lyr pulsators, one contact binary, three detached or
semi-detached eclipsing binaries, and four spotted variables. The most
interesting objects among these are the binary blue straggler V20 with an
asymmetric light curve, and the 8.1 d semidetached binary V24 located on the
red giant branch of NGC 362, which is a Chandra X-ray source. We also provide
substantial new data for 24 previously known variables.


title:
Submillimeter spectroscopy of H$_2$C$^{17}$O and a revisit of the
  rotational spectra of H$_2$C$^{18}$O and H$_2$C$^{16}$O

abstract:
  The rotational spectrum of the formaldehyde isotopologue H$_2$C$^{17}$O was
investigated between 0.56 and 1.50 THz using a sample of natural isotopic
composition. In addition, transition frequencies were determined for
H$_2$C$^{18}$O and H$_2$C$^{16}$O between 1.37 and 1.50 THz. The data were
combined with critically evaluated literature data to derive improved sets of
spectroscopic parameters which include $^{17}$O or H nuclear hyperfine
structure parameters.

categories: astro-ph.GA astro-ph.IM astro-ph.SR physics.chem-ph


title: F-index and coindex of some derived graphs

abstract:
  In this study, the explicit expressions for F-index and coindex of derived
graphs such as a line graph, subdivision graph, vertex-semitotal graph,
edge-semitotal graph, total graph and paraline graph (line graph of the
subdivision graph) are obtained.


title: PSF reconstruction validated using on-sky CANARY data in MOAO mode

abstract:
  In preparation of future Multi-Object Spectrographs (MOS) whose one of the
major role is to provide an extensive statistical studies of high redshifted
galaxies surveyed, the demonstrator Canary has been designed to tackle
technical challenges related to open-loop Adaptive-Optics (AO) control with
jointed Natural Guide Star (NGS) and Laser Guide Star (LGS) tomography. We have
developed a Point Spread Function (PSF)-Reconstruction algorithm dedicated to
MOAO systems using system telemetry to estimate the PSF potentially anywhere in
the observed field, a prerequisite to post- process AO-corrected observations
in Integral Field Spectroscopy (IFS). In this paper we show how to handle
off-axis data to estimate the PSF using atmospheric tomography and compare it
to a classical approach that uses on-axis residual phase from a truth sensor
observing a natural bright source. We have reconstructed over 450 on-sky Canary
PSFs and we get bias/1-${\sigma}$ standard-deviation (std) of 1.3/4.8 on the
H-band Strehl ratio (SR) with 92.3% of correlation between reconstructed and
sky SR. On the Full Width at Half Maximum (FWHM), we get respectively 2.94 mas,
19.9 mas and 88.3% for the bias, std and correlation. The reference method
achieves 0.4/3.5/95% on the SR and 2.71 mas/14.9 mas/92.5% on the FWHM for the
bias/std/correlation.


title:
Automatic Liver and Lesion Segmentation in CT Using Cascaded Fully
  Convolutional Neural Networks and 3D Conditional Random Fields

abstract:
  Automatic segmentation of the liver and its lesion is an important step
towards deriving quantitative biomarkers for accurate clinical diagnosis and
computer-aided decision support systems. This paper presents a method to
automatically segment liver and lesions in CT abdomen images using cascaded
fully convolutional neural networks (CFCNs) and dense 3D conditional random
fields (CRFs). We train and cascade two FCNs for a combined segmentation of the
liver and its lesions. In the first step, we train a FCN to segment the liver
as ROI input for a second FCN. The second FCN solely segments lesions from the
predicted liver ROIs of step 1. We refine the segmentations of the CFCN using a
dense 3D CRF that accounts for both spatial coherence and appearance. CFCN
models were trained in a 2-fold cross-validation on the abdominal CT dataset
3DIRCAD comprising 15 hepatic tumor volumes. Our results show that CFCN-based
semantic liver and lesion segmentation achieves Dice scores over 94% for liver
with computation times below 100s per volume. We experimentally demonstrate the
robustness of the proposed method as a decision support system with a high
accuracy and speed for usage in daily clinical routine.


title: Optimal blow up rate for the constants of Khinchin type inequalities

abstract:
  We provide, among other results, the optimal blow up rate of the constants of
a family of Khinchin inequalities for multiple sums.


title:
Generation of a VUV-to-visible Raman frequency comb in hydrogen-filled
  kagom\'e photonic crystal fiber

abstract:
  We report the generation of a purely vibrational Raman comb, extending from
the vacuum ultraviolet (184 nm) to the visible (478 nm), in hydrogen-filled
kagom\'e-style photonic crystal fiber pumped at 266 nm. Stimulated Raman
scattering and molecular modulation processes are enhanced by higher Raman gain
in the ultraviolet. Owing to the pressure-tunable normal dispersion landscape
of the fiber-gas system in the ultraviolet, higher-order anti-Stokes bands are
generated preferentially in higher-order fiber modes. The results pave the way
towards tunable fiber-based sources of deep- and vacuum ultraviolet light for
applications in, e.g., spectroscopy and biomedicine.


title: Operations on categories of modules are given by Schur functors

abstract:
  Let $k$ be a commutative $\mathbb{Q}$-algebra. We study families of functors
between categories of finitely generated $R$-modules which are defined for all
commutative $k$-algebras $R$ simultaneously and are compatible with base
changes. These operations turn out to be Schur functors associated to
$k$-linear representations of symmetric groups. This result is closely related
to Macdonald's classification of polynomial functors.


title:
An Algebraic Approach to a Class of Rank-Constrained Semi-Definite
  Programs With Applications

abstract:
  A new approach to solving a class of rankconstrained semi-definite
programming (SDP) problems, which appear in many signal processing applications
such as transmit beamspace design in multiple-input multiple-output (MIMO)
radar, downlink beamforming design in MIMO communications, generalized sidelobe
canceller design, phase retrieval, etc., is presented. The essence of the
approach is the use of underlying algebraic structure enforced in such problems
by other practical constraints such as, for example, null shaping constraint.
According to this approach, instead of relaxing the non-convex rankconstrained
SDP problem to a feasible set of positive semidefinite matrices, we restrict it
to a space of polynomials whose dimension is equal to the desired rank. The
resulting optimization problem is then convex as its solution is required to be
full rank, and can be efficiently and exactly solved. A simple matrix
decomposition is needed to recover the solution of the original problem from
the solution of the restricted one. We show how this approach can be applied to
solving some important signal processing problems that contain null-shaping
constraints. As a byproduct of our study, the conjugacy of beamfoming and
parameter estimation problems leads us to formulation of a new and rigorous
criterion for signal/noise subspace identification. Simulation results are
performed for the problem of rank-constrained beamforming design and show an
exact agreement of the solution with the proposed algebraic structure, as well
as significant performance improvements in terms of sidelobe suppression
compared to the existing methods.


title: Angular Momentum of Twisted Radiation from an Electron in Spiral Motion

abstract:
  We theoretically demonstrate for the first time that a single free electron
in circular/spiral motion emits twisted photons carrying well defined orbital
angular momentum along the axis of the electron circulation, in adding to spin
angular momentum. We show that, when the electron velocity is relativistic, the
radiation field contains harmonic components and the photons of l-th harmonic
carry lhbar total angular momentum for each. This work indicates that twisted
photons are naturally emitted by free electrons and more ubiquitous in
laboratories and in nature than ever been thought.

categories: physics.optics astro-ph.HE physics.acc-ph physics.plasm-ph


title: Search for a new baryonic state decaying to $pK^0_S$

abstract:
  We report on a new ZEUS search for a narrow state decaying into
$p(\bar{p})K^0_S$, which was previously claimed by the ZEUS collaboration. In
the present search, which uses much increased statistics, no evidence for this
state is found. Limits on the cross section for such a state are given.


title:
Nonlocal Kirchhoff superlinear equations with indefinite nonlinearity
  and lack of compactness

abstract:
  We study the following Kirchhoff equation $$- \left(1 + b \int_{\mathbb{R}^3}
|\nabla u|^2 dx \right) \Delta u + V(x) u = f(x,u), \ x \in \mathbb{R}^3.$$ A
special feature of this paper is that the nonlinearity $f$ and the potential
$V$ are indefinite, hence sign-changing. Under some appropriate assumptions on
$V$ and $f$, we prove the existence of two different solutions of the equation
via the Ekeland variational principle and Mountain Pass Theorem.


title: Generic injectivity and stability of inverse problems for connections

abstract:
  We consider the nonlinear problem of determining a connection and a Higgs
field from the corresponding parallel transport along geodesics on a Riemannian
manifold with boundary, in any dimension. The problem can be reduced to an
integral geometry question of some attenuated geodesic ray transform through a
pseudolinearization argument. We show injectivity (up to natural obstructions)
and stability estimates for both the linear and nonlinear problems for generic
simple metrics and generic connections and Higgs fields, including the
real-analytic ones. We consider the problems on simple manifolds in order to
make the exposition of the main ideas clear and concise, many results of this
paper are still true under much weaker geometric assumptions, in particular
conjugate points and trapped geodesics are allowed and the boundary is not
necessarily convex.


title:
Patterning of two-dimensional electron systems in SrTiO3 based
  heterostructures using a CeO2 template

abstract:
  Two-dimensional electron systems found at the interface of SrTiO3-based oxide
heterostructures often display anisotropic electric transport whose origin is
currently under debate. To characterize transport along specific
crystallographic directions, we developed a hard-mask patterning routine based
on an amorphous CeO2 template layer. The technique allows preparing
well-defined microbridges by conventional ultraviolet photolithography which,
in comparison to standard techniques such as ion- or wet-chemical etching, does
not induce any degradation of interfacial conductance. The patterning scheme is
described in details and the successful production of microbridges based on
amorphous Al2O3-SrTiO3 heterostructures is demonstrated. Significant
anisotropic transport is observed for T < 30 K which is mainly related to
impurity/defect scattering of charge carriers in these heterostructures.


title:
Measurement of the $\omega \to \pi^+ \pi^- \pi^0$ Dalitz plot
  distribution

abstract:
  Using the production reactions $pd\to {}^3\mbox{He}\,\omega$ and $pp\to
pp\omega$, the Dalitz plot distribution for the $\omega \to \pi^+ \pi^- \pi^0$
decay is studied with the WASA detector at COSY, based on a combined data
sample of $ (4.408\pm 0.042) \times 10^4$ events. The Dalitz plot density is
parametrised by a product of the $P$-wave phase space and a polynomial
expansion in the normalised polar Dalitz plot variables $Z$ and $\phi$. For the
first time, a deviation from pure $P$-wave phase space is observed with a
significance of $4.1\sigma$. The deviation is parametrised by a linear term
$1+2\alpha Z$, with $\alpha$ determined to be $+0.147\pm0.036$, consistent with
the expectations of $\rho$-meson-type final-state interactions of the $P$-wave
pion pairs.


title:
Characterizations of Lie Higher Derivations on J-Subspace Lattice
  Algebras

abstract:
  Let $\mathcal{L}$ be a $\mathcal{J}$-subspace lattice on a Banach space $X$
over the real or complex field $\mathbb{F}$ and $ \mathrm{Alg}\mathcal{L}$ be
the associated $\mathcal{J}$-subspace lattice algebras. In this paper, we
characterize the structure of a family $\{L_n\}_{n=0}^{\infty}:
\mathrm{Alg}\mathcal{L}\rightarrow \mathrm{Alg}\mathcal{L}$ of linear mappings
satisfying the condition
  $$L_n([A, B])=\sum_{i+j=n}[L_i(A), L_j(B)]$$ for any $A,
B\in\mathrm{Alg}\mathcal{L}$ with $AB = 0$. Moreover, the family
$\{L_n\}_{n=0}^{\infty}: \mathrm{Alg}\mathcal{L}\rightarrow
\mathrm{Alg}\mathcal{L}$ of linear mappings satisfying $L_n([A,
B]_{\xi})=\sum_{i+j=n}[L_i(A), L_j(B)]_{\xi}$ for any $A,
B\in\mathrm{Alg}\mathcal{L}$ with $AB = 0$ and $1\neq \xi\in \mathbb{F}$ is
also considered in the current work.


title: Top-quark loop corrections in Z+jet and Z+2 jet production

abstract:
  The sophistication of current predictions for $Z+$jet production at hadron
colliders necessitates a re-evaluation of any approximations inherent in the
theoretical calculations. In this paper we address one such issue, the
inclusion of mass effects in top-quark loops. We ameliorate an existing
calculation of $Z+1$~jet and $Z+2$~jet production by presenting exact analytic
formulae for amplitudes containing top-quark loops that enter at
next-to-leading order in QCD. Although approximations based on an expansion in
powers of $1/m_t^2$ can lead to poor high-energy behavior, an exact treatment
of top-quark loops demonstrates that their effect is small and has limited
phenomenological interest.


title: Weak decreasing stochastic order

abstract:
  We introduce the notion of weak decreasing stochastic (WDS) ordering for
real-valued processes with negative means, which, to our knowledge, has not
been studied before. Thanks to Madan-Yor's argument, it follows that the WDS
ordering is a necessary and sufficient condition for a process with negative
mean to be embeddable in a standard Brownian motion by the Cox and Hobson
extension of the Az\'ema-Yor algorithm. Since the decreasing stochastic order
is stronger than the WDS order, then, for every stochastically non-decreasing
family of probability measures with densities, the Cox-Hobson stopping times
provide an associated Markov process. The quantile process associated to a
stochastically non-decreasing process is not necessarily Markovian.


title: Proof Theory of Constructive Systems: Inductive Types and Univalence

abstract:
  In Feferman's work, explicit mathematics and theories of generalized
inductive definitions play a central role. One objective of this article is to
describe the connections with Martin-Lof type theory and constructive
Zermelo-Fraenkel set theory. Proof theory has contributed to a deeper grasp of
the relationship between different frameworks for constructive mathematics.
Some of the reductions are known only through ordinal-theoretic
characterizations. The paper also addresses the strength of Voevodsky's
univalence axiom. A further goal is to investigate the strength of
intuitionistic theories of generalized inductive definitions in the framework
of intuitionistic explicit mathematics that lie beyond the reach of Martin-Lof
type theory.


title: Minimal Inputs/Outputs for Subsystems in a Networked System

abstract:
  Minimal input/output selection is investigated in this paper for each
subsystem of a networked system. Some novel sufficient conditions are derived
respectively for the controllability and observability of a networked system,
as well as some necessary conditions. These conditions only depend separately
on parameters of each subsystem and its in/out-degrees. It is proven that in
order to be able to construct a controllable/observable networked system, it is
necessary and sufficient that each subsystem is controllable/observable. In
addition, both sparse and dense subsystem connections are helpful in making the
whole system controllable/observable. An explicit formula is given for the
smallest number of inputs/outputs for each subsystem required to guarantee
controllability/observability of the whole system.


title:
Magnetic helicity estimations in models and observations of the solar
  magnetic field. Part I: Finite volume methods

abstract:
  Magnetic helicity is a conserved quantity of ideal magneto-hydrodynamics
characterized by an inverse turbulent cascade. Accordingly, it is often invoked
as one of the basic physical quantities driving the generation and structuring
of magnetic fields in a variety of astrophysical and laboratory plasmas. We
provide here the first systematic comparison of six existing methods for the
estimation of the helicity of magnetic fields known in a finite volume. All
such methods are reviewed, benchmarked, and compared with each other, and
specifically tested for accuracy and sensitivity to errors. To that purpose, we
consider four groups of numerical tests, ranging from solutions of the
three-dimensional, force-free equilibrium, to magneto-hydrodynamical numerical
simulations. Almost all methods are found to produce the same value of magnetic
helicity within few percent in all tests. In the more solar-relevant and
realistic of the tests employed here, the simulation of an eruptive flux rope,
the spread in the computed values obtained by all but one method is only 3%,
indicating the reliability and mutual consistency of such methods in
appropriate parameter ranges. However, methods show differences in the
sensitivity to numerical resolution and to errors in the solenoidal property of
the input fields. In addition to finite volume methods, we also briefly discuss
a method that estimates helicity from the field lines' twist, and one that
exploits the field's value at one boundary and a coronal minimal connectivity
instead of a pre-defined three-dimensional magnetic-field solution.


title: Classifying the provably total set functions of KP and KP(P)

abstract:
  This article is concerned with classifying the provably total set-functions
of Kripke-Platek set theory, KP, and Power Kripke-Platek set theory, KP(P), as
well as proving several (partial) conservativity results. The main technical
tool used in this paper is a relativisation technique where ordinal analysis is
carried out relative to an arbitrary but fixed set x. A classic result from
ordinal analysis is the characterisation of the provably recursive functions of
Peano Arithmetic, PA, by means of the fast growing hierarchy [10]. Whilst it is
possible to formulate the natural numbers within KP, the theory speaks
primarily about sets. For this reason it is desirable to obtain a
characterisation of its provably total set functions. We will show that KP
proves the totality of a set function precisely when it falls within a
hierarchy of set functions based upon a relativised constructible hierarchy
stretching up in length to any ordinal below the Bachmann-Howard ordinal. As a
consequence of this result we obtain that IKP + forall x,y (x in y or x not in
y) is conservative over KP for forall-exists-formulae, where IKP stands for
intuitionistic Kripke-Platek set theory. In a similar vein, utilising [56], it
is shown that KP(P) proves the totality of a set function precisely when it
falls within a hierarchy of set functions based upon a relativised von Neumann
hierarchy of the same length. The relativisation technique applied to KP(P)
with the global axiom of choice, AC-global, also yields a parameterised
extension of a result in [58], showing that KP(P) + AC-global is conservative
over KP(P) + AC and CZF + AC for Pi_2 in powerset statements. Here AC stands
for the ordinary axiom of choice and CZF refers to constructive
Zermelo-Fraenkel set theory.


title: Magnetic activity of seismic solar analogs

abstract:
  We present our latest results on the solar-stellar connection by studying 18
solar analogs that we identified among the Kepler seismic sample (Salabert et
al., 2016a). We measured their magnetic activity properties using observations
collected by the Kepler satellite and the ground-based, high-resolution Hermes
spectrograph. The photospheric (Sph) and chromospheric (S) magnetic activity
proxies of these seismic solar analogs are compared in relation to solar
activity. We show that the activity of the Sun is actually comparable to the
activity of the seismic solar analogs. Furthermore, we report on the discovery
of temporal variability in the acoustic frequencies of the young (1 Gyr-old)
solar analog KIC10644253 with a modulation of about 1.5 years, which agrees
with the derived photospheric activity (Salabert et al., 2016b). It could
actually be the signature of the short-period modulation, or quasi-biennal
oscillation, of its magnetic activity as observed in the Sun and the 1-Gyr-old
solar analog HD30495. In addition, the lithium abundance and the chromospheric
activity estimated from Hermes confirms that KIC10644253 is a young and more
active star than the Sun.


title: Curves and envelopes that bound the spectrum of a matrix

abstract:
  A generalization of the method developed by Adam, Psarrakos and Tsatsomeros
to find inequalities for the eigenvalues of a complex matrix A using knowledge
of the largest eigenvalues of its Hermitian part H(A) is presented. The
numerical range or field of values of A can be constructed as the intersection
of half-planes determined by the largest eigenvalue of H($e^{i\theta}$A). Adam,
Psarrakos and Tsatsomeros showed that using the two largest eigenvalues of
H(A), the eigenvalues of A satisfy a cubic inequality and the envelope of such
cubic curves defines a region in the complex plane smaller than the numerical
range but still containing the spectrum of A. Here it is shown how using the
three largest eigenvalues of H(A) or more, one obtains new inequalities for the
eigenvalues of A and new envelope-type regions containing the spectrum of A.


title:
New exact solutions of hydrodynamics for rehadronizing fireballs with
  lattice QCD equation of state

abstract:
  We describe fireballs that rehadronize from a perfectly fluid quark matter to
a chemically frozen, multi-component hadron gas. In the hydrodynamics of these
fireballs, we utilize the lattice QCD equation of state, however, we also apply
non-relativistic kinematics for simplicity and clarity. Two new classes of
exact, analytic solutions of fireball hydrodynamics are presented: the first
class describes triaxially expanding, non-rotating ellipsoidal fireballs, while
the second class of exact solutions corresponds to spheroidally symmetric,
rotating fireballs. In both classes of solutions, we find evidence for a
secondary explosion, that happens just after hadrochemical freeze-out. A
realistic, linear mass scaling of the slope parameters of the single particle
spectra of various hadronic species is obtained analytically, as well as an
also realistic, linear mass scaling of the inverse of the squared HBT radius
parameters of the Bose-Einstein correlation functions.


title:
Phenomenology of infant death rates. Identification of the peaks of
  viral and bacterial diseases

abstract:
  After birth setting up an effective immune system is a major challenge for
all living organisms. In this paper we show that this process can be explored
by using the age-specific infant death rate as a kind of sensor. This is made
possible because, as shown by the authors in Berrut et al. (2016), between
birth and a critical age t_c, for all mammals the death rate decreases with age
as an hyperbolic function. For humans t_c is equal to 10 years. At some ages
the hyperbolic fall displays spikes which, it is assumed, correspond to
specific events in the organism's response to exogenous factors. One of these
spikes occurs 10 days after birth and there is another at the age of about 300
days. It is shown that the first spike is related to viral infections whereas
the second is related to bacterial diseases. By going back to former time
periods during which infant mortality was much higher than currently, it is
possible to get a magnified view of these peaks which in turn may give us
useful information about how an organism adapts to new conditions. Apart from
pathogens, the same methodology can be used to study the response to changes in
other external conditions, e.g. supply of food, temperature or oxygen level.


title:
Evolutionary history of four binary blue stragglers from the globular
  clusters \omega Cen, M55, 47 Tuc and NGC 6752

abstract:
  Context. Origin and evolution of blue stragglers in globular clusters is
still a matter of debate. Aims. The aim of the present investigation is to
reproduce the evolutionary history of four binary blue stragglers in four
different clusters, for which precise values of global parameters are known.
Methods. Using the model for cool close binary evolution, developed by one of
us (KS), progenitors of all investigated binaries were found and their
parameters evolved into the presently observed values. Results. The results
show that the progenitors of the binary blue stragglers are cool close binaries
with period of a few days, which transform into stragglers by rejuvenation of
the initially less massive component by mass transfer from its more massive
companion overflowing the inner critical Roche surface. The parameters of V209
from \omega Cen indicate that the binary is substantially enriched in helium.
This is an independent and strong evidence for the existence of the helium rich
subpopulation in this cluster.


title:
Difference frequencies of nonradial pulsation modes and repetitive
  outbursts in classical Be stars

abstract:
  Space photometry has revealed rich pulsation spectra in classical Be stars.
Often frequency pairs can be found that differ by nearly the frequency of a
third genuine stellar variability. The lowest currently known of these
so-called difference (or $\Delta$) frequencies reach 0.03 c/d, which is the
upper limit of outburst frequencies. The potential of such slow variations for
pulsation-assisted mass loss is discussed.


title: Results from the ANTARES Neutrino Telescope

abstract:
  A primary goal of a deep-sea neutrino telescopes as ANTARES is the search for
astrophysical neutrinos in the TeV-PeV range. ANTARES is today the largest
neutrino telescope in the Northern hemisphere. After the discovery of a cosmic
neutrino diffuse flux by the IceCube, the understanding of its origin has
become a key mission in high-energy astrophysics. ANTARES makes a valuable
contribution for sources located in the Southern sky thanks to its excellent
angular resolution in both the muon channel and the cascade channel (induced by
all neutrino flavors).
  Assuming various spectral indexes for the energy spectrum of neutrino
emitters, the Southern sky and in particular central regions of our Galaxy are
studied searching for point-like objects and for extended regions of emission.
In parallel, by adopting a multimessenger approach, based on time and/or space
coincidences with other cosmic probes, the sensitivity of such searches can be
considerably augmented. ANTARES has participated to a high-energy neutrino
follow-up of the gravitational wave signal GW150914, providing the first
constraint on high-energy neutrino emission from a binary black hole
coalescence. ANTARES has also performed indirect searches for Dark Matter,
yielding limits for the spin-dependent WIMP-nucleon cross-section that improve
upon those of current direct-detection experiments.


title:
A remark on gradient estimates for spacelike mean curvature flow with
  boundary conditions

abstract:
  We prove a gradient estimate for graphical spacelike mean curvature flow with
a general Neumann boundary condition in dimension $n=2$. This then implies that
the mean curvature flow exists for all time and converges to a translating
solution.


title: The Bose polaron problem: effect of mass imbalance on binding energy

abstract:
  By means of Quantum Monte Carlo methods we calculate the binding energy of an
impurity immersed in a Bose-Einstein condensate at T = 0. The focus is on the
attractive branch of the Bose polaron and on the role played by the mass
imbalance between the impurity and the surrounding particles. For an impurity
resonantly coupled to the bath, we investigate the dependence of the binding
energy on the mass ratio and on the interaction strength within the medium. In
particular, we determine the equation of state in the case of a static
(infinite mass) impurity, where three-body correlations are irrelevant and the
result is expected to be a universal function of the gas parameter. For the
mass ratio corresponding to $^{40}$K impurities in a gas of $^{87}$Rb atoms we
provide an explicit comparison with the experimental findings of a recent study
carried out at JILA.


title:
Mapping atomic orbitals with the transmission electron microscope:
  Images of defective graphene predicted from first-principles theory

abstract:
  Transmission electron microscopy has been a promising candidate for mapping
atomic orbitals for a long time. Here, we explore its capabilities by a first
principles approach. For the example of defected graphene, exhibiting either an
isolated vacancy or a substitutional nitrogen atom, we show that three
different kinds of images are to be expected, depending on the orbital
character. To judge the feasibility of visualizing orbitals in a real
microscope, the effect of the optics aberrations is simulated. We demonstrate
that, by making use of energy-filtering, it should indeed be possible to map
atomic orbitals in a state-of-the-art transmission electron microscope.


title:
Enhancing thermal stability of solution-processed small molecule
  semiconductor thin films using a flexible linker approach

abstract:
  Solution-processed organic photovoltaics (OPV) have recently reached the
target 10% power conversion efficiency expected to signal their viable
commercialization as an inexpensive and scalable energy conversion technology.
However, obtaining devices with suitable long-term stability remains an
unsolved challenge. Here we present a new strategy to improve the thermal
stability of small-molecule-based bulk-heterojunction OPVs by including a
custom additive specifically designed to interact with the device active layer
components. Our results indicate that active layer degradation under continuous
thermal stress can be inhibited due to the formation of more robust thin film
microstructure with the additive present. Since our additive employs the
identical semiconductor core used in the active layer, but linked by aliphatic
chains into a flexible polymer, this straightforward strategy can reasonably be
applied to stabilize a wide variety of semiconducting small molecules in
solution-processed molecular OPVs, transistors and light emitting diodes.


title:
Micro-Structured Two-Component 3D Metamaterials with Negative
  Thermal-Expansion Coefficient from Positive Constituents

abstract:
  Controlling the thermal expansion of materials is of great technological
importance. Uncontrolled thermal expansion can lead to failure or irreversible
destruction of structures and devices. In ordinary crystals, thermal expansion
is governed by the asymmetry of the microscopic binding potential, which cannot
be adjusted easily. In artificial crystals called metamaterials, thermal
expansion can be controlled by structure. Here, following previous theoretical
work, we fabricate three-dimensional two-component polymer microlattices by
using gray-tone laser lithography. We perform cross-correlation analysis of
optical microscopy images taken at different sample temperatures. The derived
displacement-vector field reveals that the thermal expansion and resulting
bending of the bi-material beams leads to a rotation of the 3D chiral crosses
arranged onto a 3D checkerboard pattern within one metamaterial unit cell.
These rotations can over-compensate the expansion and lead to an effectively
negative thermal length-expansion coefficient for all positive constituents
evidencing a striking level of thermal-expansion control.


title: New testing procedures for Structural Equation Modeling

abstract:
  We introduce and evaluate a new class of hypothesis testing procedures for
moment structures. The methods are valid under weak assumptions and includes
the well-known Satorra-Bentler adjustment as a special case. The proposed
procedures applies also to difference testing among nested models. We prove the
consistency of our approach. We introduce a bootstrap selection mechanism to
optimally choose a p-value approximation for a given sample. Also, we propose
bootstrap procedures for assessing the asymptotic robustness (AR) of the
normal-theory maximum likelihood test, and for the key assumption underlying
the Satorra-Bentler adjustment (Satorra-Bentler consistency). Simulation
studies indicate that our new p-value approximations performs well even under
severe nonnormality and realistic sample sizes, but that our tests for AR and
Satorra-Bentler consistency require very large sample sizes to work well.


title: Quantum information processing with superconducting circuits: a review

abstract:
  During the last ten years, superconducting circuits have passed from being
interesting physical devices to becoming contenders for near-future useful and
scalable quantum information processing (QIP). Advanced quantum simulation
experiments have been shown with up to nine qubits, while a demonstration of
Quantum Supremacy with fifty qubits is anticipated in just a few years. Quantum
Supremacy means that the quantum system can no longer be simulated by the most
powerful classical supercomputers. Integrated classical-quantum computing
systems are already emerging that can be used for software development and
experimentation, even via web interfaces.
  Therefore, the time is ripe for describing some of the recent development of
superconducting devices, systems and applications. As such, the discussion of
superconducting qubits and circuits is limited to devices that are proven
useful for current or near future applications. Consequently, the centre of
interest is the practical applications of QIP, such as computation and
simulation in Physics and Chemistry.


title:
Morphology Generation for Statistical Machine Translation using Deep
  Learning Techniques

abstract:
  Morphology in unbalanced languages remains a big challenge in the context of
machine translation. In this paper, we propose to de-couple machine translation
from morphology generation in order to better deal with the problem. We
investigate the morphology simplification with a reasonable trade-off between
expected gain and generation complexity. For the Chinese-Spanish task, optimum
morphological simplification is in gender and number. For this purpose, we
design a new classification architecture which, compared to other standard
machine learning techniques, obtains the best results. This proposed
neural-based architecture consists of several layers: an embedding, a
convolutional followed by a recurrent neural network and, finally, ends with
sigmoid and softmax layers. We obtain classification results over 98% accuracy
in gender classification, over 93% in number classification, and an overall
translation improvement of 0.7 METEOR.


title: MuPix7 - A fast monolithic HV-CMOS pixel chip for Mu3e

abstract:
  The MuPix7 chip is a monolithic HV-CMOS pixel chip, thinned down to 50 \mu m.
It provides continuous self-triggered, non-shuttered readout at rates up to 30
Mhits/chip of 3x3 mm^2 active area and a pixel size of 103x80 \mu m^2. The hit
efficiency depends on the chosen working point. Settings with a power
consumption of 300 mW/cm^2 allow for a hit efficiency >99.5%. A time resolution
of 14.2 ns (Gaussian sigma) is achieved. Latest results from 2016 test beam
campaigns are shown.


title: Horndeski/Galileon in High Energy Collisions

abstract:
  Horndeski/Galileons may be considered as a proper generalization of General
Relativity in high energy regime. Thus one may search for manifestation of
Galileons interaction in collision experiments. In this paper we give arguments
supporting this thesis. Galileon scalar field do not interact with matter via
Standard Model interactions, we discuss a mechanism that allows Galileons to
have influence on particle collisions. We give reasons to narrow the whole
class of Horndeski/Galileons models to one particular term - John term from Fab
Four subclass - for this particular issue. We were able to establish the
constraint on the model coupling constant.


title: Hamilton Cycles in Double Generalized Petersen Graphs

abstract:
  Watkins (1969) first introduced the generalized Petersen graphs (GPGs) by
modifying Petersen graph. Zhou and Feng (2012) modified GPGs and introduced the
double generalized Petersen graphs (DGPGs). Kutnar and Petecki (2016) proved
that DGPGs are Hamiltonian in special cases and conjectured that all DGPGs are
Hamiltonian. In this paper, we construct Hamilton cycles in all DGPGs.


title: Challenges of Computational Processing of Code-Switching

abstract:
  This paper addresses challenges of Natural Language Processing (NLP) on
non-canonical multilingual data in which two or more languages are mixed. It
refers to code-switching which has become more popular in our daily life and
therefore obtains an increasing amount of attention from the research
community. We report our experience that cov- ers not only core NLP tasks such
as normalisation, language identification, language modelling, part-of-speech
tagging and dependency parsing but also more downstream ones such as machine
translation and automatic speech recognition. We highlight and discuss the key
problems for each of the tasks with supporting examples from different language
pairs and relevant previous work.


title:
`That looks weird' - evaluating citizen scientists' ability to detect
  unusual features in ATLAS images of LHC collisions

abstract:
  Using data from the HiggsHunters.org project we investigate the ability of
non-expert citizen scientists to identify long-lived particles, and other
unusual features, in images of LHC collisions recorded by the ATLAS experiment.
More than 32,000 volunteers from 179 countries participated, classifying
1,200,000 features of interest on about 39,000 distinct images. We find that
the non-expert volunteers are capable of identifying the decays of long-lived
particles with an efficiency and fake-rate comparable to that of the ATLAS
algorithms. Volunteers also picked out events with unexpected features,
including what appeared to be an event containing a jet of muons.


title: A remark on regularity of powers and products of ideals

abstract:
  New title and minor adjustments. To appear in the Journal of Pure and Applied
Algebra


title:
Real-root property of the spectral polynomial of the Treibich-Verdier
  potential and related problems

abstract:
  We study the spectral polynomial of the Treibich-Verdier potential. Such
spectral polynomial, which is a generalization of the classical Lame
polynomial, plays fundamental roles in both the finite-gap theory and the ODE
theory of Heun's equation. In this paper, we prove that all the roots of such
spectral polynomial are real and distinct under some assumptions. The proof
uses the classical concept of Sturm sequence and isomonodromic theories. We
also prove an analogous result for a polynomial associated with a generalized
Lame equation. Differently, our new approach is based on the viewpoint of the
monodromy data.


title:
Stability analysis of the homogeneous hydrodynamics of a model for a
  confined granular gas

abstract:
  The linear hydrodynamic stability of a model for confined
quasi-two-dimensional granular gases is analyzed. The system exhibits
homogeneous hydrodynamics, i.e. there are macroscopic evolution equations for
homogeneous states. The stability analysis is carried out around all these
states and not only the homogeneous steady state reached eventually by the
system. It is shown that in some cases the linear analysis is not enough to
reach a definite conclusion on the stability, and molecular dynamics simulation
results are presented to elucidate these cases. The analysis shows the
relevance of nonlinear hydrodynamic contributions to describe the behavior of
spontaneous fluctuations occurring in the system, that lead even to the
transitory formation of clusters of particles. The conclusion is that the
system is always stable. The relevance of the results for describing the
instabilities of confined granular gases observed experimentally is discussed.


title: Persistence of Chaos in Coupled Lorenz Systems

abstract:
  The dynamics of unidirectionally coupled chaotic Lorenz systems is
investigated. It is revealed that chaos is present in the response system
regardless of generalized synchronization. The presence of sensitivity is
theoretically proved, and the auxiliary system approach and conditional
Lyapunov exponents are utilized to demonstrate the absence of synchronization.
Periodic motions embedded in the chaotic attractor of the response system is
demonstrated by taking advantage of a period-doubling cascade of the drive. The
obtained results may shed light on the global unpredictability of the weather
dynamics and can be useful for investigations concerning coupled Lorenz lasers.


title:
Kinetic Equation and Non-equilibrium Entropy for a Quasi-two-dimensional
  Gas

abstract:
  A kinetic equation for a dilute gas of hard spheres confined between two
parallel plates separated a distance smaller than two particle dimeters is
derived. It is a Boltzmann-like equation, which incorporates the effect of the
confinement on the particle collisions. A function $S(t)$ is constructed by
adding to the Boltzmann expression a confinement contribution. Then it is shown
that for the solutions of the kinetic equation, $S(t)$ increases monotonically
in time, until the system reaches a stationary inhomogeneous state, when $S$
becomes the equilibrium entropy of the confined system as derived from
equilibrium statistical mechanics. From the entropy, other equilibrium
properties are obtained, and Molecular Dynamics simulations are used to verify
some of the theoretical predictions.


title:
Prospect for UV observations from the Moon. II. Instrumental Design of
  an Ultraviolet Imager LUCI

abstract:
  We present a design for a near-ultraviolet (NUV) imaging instrument which may
be flown on a range of available platforms, including high-altitude balloons,
nanosatellites, or space missions. Although all current UV space missions adopt
a Ritchey-Chretain telescope design, this requires aspheric optics, making the
optical system complex, expensive and challenging for manufacturing and
alignment. An all-spherical configuration is a cost-effective and simple
solution. We have aimed for a small payload which may be launched by different
platforms and we have designed a compact, light-weight payload which will
withstand all launch loads. No other UV payloads have been previously reported
with an all-spherical optical design for imaging in the NUV domain and a weight
below 2 kg. Our main science goal is focussed on bright UV sources not
accessible by the more sensitive large space UV missions.
  Here we discuss various aspects of design and development of the complete
instrument, the structural and finite-element analysis of the system performed
to ensure that the payload withstands launch-load stresses and vibrations. We
expect to fly this telescope -- Lunar Ultraviolet Cosmic Imager (LUCI) -- on a
spacecraft to the Moon as part of the Indian entry into Google X-Prize
competition. Observations from the Moon provide a unique opportunity to observe
the sky from a stable platform far above the Earth's atmosphere. However, we
will explore other opportunities as well, and will fly this telescope on a
high-altitude balloon later this year.