title:
Linear relation between HI circular velocity and stellar velocity
  dispersion in early-type galaxies, and slope of the density profiles

abstract:
  We report a tight linear relation between the HI circular velocity measured
at 6 $R_{\rm e}$ and the stellar velocity dispersion measured within 1 $R_{\rm
e}$ for a sample of 16 early-type galaxies with stellar mass between $10^{10}$
and $10^{11}$ $\mathrm{M}_\odot$. The key difference from previous studies is
that we only use spatially resolved $v_\mathrm{circ}$(HI) measurements obtained
at large radius for a sizeable sample of objects. We can therefore link a
kinematical tracer of the gravitational potential in the dark-matter dominated
outer regions of galaxies with one in the inner regions, where baryons control
the distribution of mass. We find that $v_\mathrm{circ}$(HI) = 1.33
$\sigma_\mathrm{e}$ with an observed scatter of just 12 percent. This indicates
a strong coupling between luminous and dark matter from the inner- to the outer
regions of early-type galaxies, analogous to the situation in spirals and dwarf
irregulars. The $v_\mathrm{circ}$(HI)-$\sigma_\mathrm{e}$ relation is shallower
than those based on $v_\mathrm{circ}$ measurements obtained from stellar
kinematics and modelling at smaller radius, implying that \vcirc\ declines with
radius -- as in bulge-dominated spirals. Indeed, the value of
$v_\mathrm{circ}$(HI) is typically 25 percent lower than the maximum
$v_\mathrm{circ}$ derived at $\sim0.2\ R_\mathrm{e}$ from dynamical models.
Under the assumption of power-law total density profiles $\rho \propto
r^{-\gamma}$, our data imply an average logarithmic slope
$\langle\gamma\rangle=2.18\pm0.03$ across the sample, with a scatter of 0.11
around this value. The average slope and scatter agree with recent results
obtained from stellar kinematics alone for a different sample of early-type
galaxies.


title:
Conforming mixed triangular prism and nonconforming mixed tetrahedral
  elements for the linear elasticity problem

abstract:
  We propose two families of mixed finite elements for solving the classical
Hellinger-Reissner mixed problem of the linear elasticity equations in three
dimensions. First, a family of conforming mixed triangular prism elements is
constructed by product of elements on triangular meshes and elements in one
dimension. The well-posedness is established for all elements with $k\geq1$,
which are of $k+1$ order convergence for both the stress and displacement.
Besides, a family of reduced stress spaces is proposed by dropping the degrees
of polynomial functions associated with faces. As a result, the lowest order
conforming mixed triangular prism element has 93 plus 33 degrees of freedom on
each element. Second, we construct a new family of nonconforming mixed
tetrahedral elements. The shape function spaces of our stress spaces are
different from those of the elements in literature.


title: Image Colorization Using a Deep Convolutional Neural Network

abstract:
  In this paper, we present a novel approach that uses deep learning techniques
for colorizing grayscale images. By utilizing a pre-trained convolutional
neural network, which is originally designed for image classification, we are
able to separate content and style of different images and recombine them into
a single image. We then propose a method that can add colors to a grayscale
image by combining its content with style of a color image having semantic
similarity with the grayscale one. As an application, to our knowledge the
first of its kind, we use the proposed method to colorize images of ukiyo-e a
genre of Japanese painting?and obtain interesting results, showing the
potential of this method in the growing field of computer assisted art.


title:
Observability-Aware Trajectory Optimization for Self-Calibration with
  Application to UAVs

abstract:
  We study the nonlinear observability of a systems states in view of how well
they are observable and what control inputs would improve the convergence of
their estimates. We use these insights to develop an observability-aware
trajectory-optimization framework for nonlinear systems that produces
trajectories well suited for self-calibration. Common trajectory-planning
algorithms tend to generate motions that lead to an unobservable subspace of
the system state, causing suboptimal state estimation. We address this problem
with a method that reasons about the quality of observability while respecting
system dynamics and motion constraints to yield the optimal trajectory for
rapid convergence of the self-calibration states (or other user-chosen states).
Experiments performed on a simulated quadrotor system with a GPS-IMU sensor
suite demonstrate the benefits of the optimized observability-aware
trajectories when compared to a covariance-based approach and multiple
heuristic approaches. Our method is approx. 80x faster than the
covariance-based approach and achieves better results than any other approach
in the self-calibration task. We applied our method to a waypoint navigation
task and achieved a approx. 2x improvement in the integrated RMSE of the global
position estimates and approx. 4x improvement in the integrated RMSE of the
GPS-IMU transformation estimates compared to a minimal-energy trajectory
planner.


title:
Procedural Generation of Angry Birds Levels using Building Constructive
  Grammar with Chinese-Style and/or Japanese-Style Models

abstract:
  This paper presents a procedural generation method that creates visually
attractive levels for the Angry Birds game. Besides being an immensely popular
mobile game, Angry Birds has recently become a test bed for various artificial
intelligence technologies. We propose a new approach for procedurally
generating Angry Birds levels using Chinese style and Japanese style building
structures. A conducted experiment confirms the effectiveness of our approach
with statistical significance.


title:
The $Spitzer$ infrared spectrograph survey of protoplanetary disks in
  Orion A: I. disk properties

abstract:
  We present our investigation of 319 Class II objects in Orion A observed by
$Spitzer$/IRS. We also present the follow-up observation of 120 of these Class
II objects in Orion A from IRTF/SpeX. We measure continuum spectral indices,
equivalent widths, and integrated fluxes that pertain to disk structure and
dust composition from IRS spectra of Class II objects in Orion A. We estimate
mass accretion rates using hydrogen recombination lines in the SpeX spectra of
our targets. Utilizing these properties, we compare the distributions of the
disk and dust properties of Orion A disks to those of Taurus disks with respect
to position within Orion A (ONC and L1641) and to the sub-groups by the
inferred radial structures, such as transitional disks vs. radially continuous
full disks. Our main findings are as follows. (1) Inner disks evolve faster
than the outer disks. (2) Mass accretion rate of transitional disks and that of
radially continuous full disks are statistically significantly displaced from
each other. The median mass accretion rate of radially continuous disks in ONC
and L1641 is not very different from that in Taurus. (3) Less grain processing
has occurred in the disks in ONC compared to those in Taurus, based on analysis
of the shape index of the 10 $\mu$m silicate feature ($F_{11.3}/F_{9.8}$). (4)
The 20-31 $\mu$m continuum spectral index tracks the projected distance from
the most luminous Trapezium star, $\theta^{1}$ Ori C. A possible explanation is
the effect of UV ablation of the outer part of the disks.


title: Spin exchange collision mixing of the K and Rb ac Stark shifts

abstract:
  In a hybrid pumping alkali vapor cell that both K and Rb are filled, K atom
spins are optically pumped by laser and Rb atom spins are polarized by the K
spins through spin exchange. We find that the AC Stark shift of the Rb atoms is
composed of not only the AC Stark shift of the Rb atoms caused by the far off
resonant pumping laser which is tuned to the K absorption lines, but also the
AC Stark shift of the K atom spins. The mixing of the light shifts through fast
spin exchange between K and Rb atoms are studied in this paper and we
demonstrate a K-Rb-21Ne co-magnetometer in which the AC Stark shift of the Rb
atoms are reduced by the collision mixing.


title: On the roots of a hyperbolic polynomial pencil

abstract:
  Let $\nu_0(t),\nu_1(t),\,\ldots\,,\nu_n(t)$ be the roots of the equation
$R(z)=t$, where $R(z)$ is a rational function of the form
\[R(z)=z+\sum\limits_{k=1}^n\frac{\alpha_k}{z-\mu_k},\] $\mu_k$ are pairwise
different real numbers, $\alpha_k>0,\,1\leq{}k\leq{}n$. Then for each real
$\xi$, the function
$e^{\xi\nu_0(t)}+e^{\xi\nu_1(t)}+\,\cdots\,+e^{\xi\nu_n(t)}$ is exponentially
convex on the interval $-\infty<t<\infty$.


title:
What are $Omh^2(z_1,z_2)$ and $Om(z_1,z_2)$ diagnostics telling us in
  light of $H(z)$ data?

abstract:
  Two-point diagnostics $Om(z_i,z_j)$ and $Omh^2(z_i,z_j)$ have been introduced
as an interesting tool for testing the validity of the $\Lambda$CDM model.
Quite recently, Sahni, Shafieloo $\&$ Starobinsky (2014) combined two
independent measurements of $H(z)$ from BAO data with the value of the Hubble
constant $H_0$, and used the second of these diagnostics to test the
$\Lambda$CDM model. Their result indicated a considerable tension between
observations and predictions of the $\Lambda$CDM model. Since reliable data
concerning expansion rates of the Universe at different redshifts $H(z)$ are
crucial for the successful application of this method, we investigate both
two-point diagnostics on the most comprehensive set of $N=36$ measurements of
$H(z)$ coming from the BAO and differential ages (DA) of passively evolving
galaxies. We discuss the uncertainties of two-point diagnostics and find that
they are strongly non-Gaussian and follow the patterns deeply rooted in their
very construction. Therefore we propose that non-parametric median statistics
is the most appropriate way of treating this problem. Our results support the
claims that $\Lambda$CDM is in tension with $H(z)$ data according to the
two-point diagnostics developed by Shafieloo, Sahni and Starobinsky. However,
other alternatives to the $\Lambda$CDM, such as wCDM or CPL models perform even
worse. We also notice that there are serious systematic differences between BAO
and DA methods which ought to be better understood before $H(z)$ measurements
can become competitive to the other probes.


title:
Relation between the rate of convergence of strong law of large numbers
  and the rate of concentration of Bayesian prior in game-theoretic probability

abstract:
  We study the behavior of the capital process of a continuous Bayesian mixture
of fixed proportion betting strategies in the one-sided unbounded forecasting
game in game-theoretic probability. We establish the relation between the rate
of convergence of the strong law of large numbers in the self-normalized form
and the rate of divergence to infinity of the prior density around the origin.
In particular we present prior densities ensuring the validity of
Erdos-Feller-Kolmogorov-Petrowsky law of the iterated logarithm.


title: Trapped charge driven degradation of perovskite solar cells

abstract:
  Perovskite solar cells have shown fast deterioration during actual operation
even with encapsulation, but its mechanism has been elusive. We found the
fundamental mechanism for irreversible degradation of perovskite materials in
which trapped charges regardless of the polarity play a decisive role. A novel
experimental setup utilizing different polarity ions revealed that the moisture
induced irreversible dissociation of perovskite materials is triggered by
charges trapped along grain boundaries. Our finding clearly explained the
intriguing observations why light soaking induces irreversible degradation
while in the dark, moisture only causes reversible hydration, and why
degradation begins from different side of interface for different charge
extraction layers. The deprotonation of organic cations by trapped charge
induced local electric field is attributed to the initiation of irreversible
decomposition.


title: Helicity and nuclear $\beta$ decay correlations

abstract:
  We present simple derivations of nuclear $\beta$-decay correlations with an
emphasis on the special role of helicity. This provides a good opportunity to
teach students about helicity and chirality in particle physics through
exercises using simple aspects of quantum mechanics. In addition, this paper
serves as an introduction to nuclear $\beta$-decay correlations from both a
theoretical and experimental vantage. This article can be used to introduce
students to ongoing experiments searching for hints of new physics in the
low-energy precision frontier.


title:
Proposal for implementing universal superadiabatic geometric quantum
  gates in nitrogen-vacancy centers

abstract:
  We propose a feasible scheme to implement a universal set of quantum gates
based on geometric phases and superadiabatic quantum control. Consolidating the
advantages of both strategies, the proposed quantum gates are robust and fast.
The diamond nitrogen-vacancy center system is adopted as a typical example to
illustrate the scheme. We show that these gates can be realized in a simple
two-level configuration by appropriately controlling the amplitude, phase, and
frequency of just one microwave field. The gate's robust and fast features are
confirmed by comparing the fidelity of the proposed superadiabatic geometric
phase (controlled-PHASE) gate with those of two other kinds of phase
(controlled-PHASE) gates.


title:
Study of Swift/BAT Selected Low-luminosity Active Galactic Nuclei
  Observed with Suzaku

abstract:
  We systematically analyze the broadband (0.5--200 keV) X-ray spectra of hard
X-ray ($>10$ keV) selected local low-luminosity active galactic nuclei (LLAGNs)
observed with {\it Suzaku} and {\it Swift}/BAT. The sample consists of ten
LLAGNs detected with {\it Swift}/BAT with intrinsic 14--195 keV luminosities
smaller than $10^{42}$ erg s$^{-1}$ available in the {\it Suzaku} archive,
covering a wide range of the Eddington ratio from $10^{-5}$ to $10^{-2}$. The
overall spectra can be reproduced with an absorbed cut-off power law, often
accompanied by reflection components from distant cold matter, and/or
optically-thin thermal emission from the host galaxy. In all objects,
relativistic reflection components from the innermost disk are not required.
Eight objects show a significant narrow iron-K$\alpha$ emission line. Comparing
their observed equivalent widths with the predictions from the Monte-Carlo
based torus model by \cite{Ike09}, we constrain the column density in the
equatorial plane to be $\log N^{\rm eq}_{\rm H} > 22.7$ or the torus half
opening angle $\theta_{\rm oa} < 70^\circ$. We infer that the Eddington ratio
($\lambda_{\rm Edd}$) is a key parameter that determines the torus structure of
LLAGNs: the torus becomes large at $\lambda_{\rm Edd} \gtrsim 2\times10^{-4}$,
whereas at lower accretion rates it is little developed. The luminosity
correlation between the hard X-ray and mid-infrared (MIR) bands of the LLAGNs
follows the same one as for more luminous AGNs. This implies that other
mechanisms than AGN-heated dust are responsible for the MIR emission in low
Eddington ratio LLAGNs.


title: Boundary feedback stabilization of Fisher's equation

abstract:
  The aim of this work is to design an explicit finite dimensional boundary
feedback controller for locally exponentially stabilizing the equilibrium
solutions to Fisher's equation in both $L^2(0,1)$ and $H^1(0,1)$. The feedback
controller is expressed in terms of the eigenfunctions corresponding to
unstable eigenvalues of the linearized equation. This stabilizing procedure is
applicable for any level of instability, which extends the result of \cite{02}
for nonlinear parabolic equations. The effectiveness of the approach is
illustrated by a numerical simulation.


title: Direct measurement of the density matrix of a quantum system

abstract:
  One drawback of conventional quantum state tomography is that it does not
readily provide access to single density matrix elements, since it requires a
global reconstruction. Here we experimentally demonstrate a scheme that can be
used to directly measure individual density matrix elements of general quantum
states. The scheme relies on measuring a sequence of three observables, each
complementary to the last. The first two measurements are made weak to minimize
the disturbance they cause to the state, while the final measurement is strong.
We perform this joint measurement on polarized photons in pure and mixed states
to directly measure their density matrix. The weak measurements are achieved
using two walk-off crystals, each inducing a polarization-dependent spatial
shift that couples the spatial and polarization degree of freedom of the
photons. This direct measurement method provides an operational meaning to the
density matrix and promises to be especially useful for large dimensional
states.


title:
Fundamental Green Tradeoffs: Progresses, Challenges, and Impacts on 5G
  Networks

abstract:
  With years of tremendous traffic and energy consumption growth, green radio
has been valued not only for theoretical research interests but also for the
operational expenditure reduction and the sustainable development of wireless
communications. Fundamental green tradeoffs, served as an important framework
for analysis, include four basic relationships: spectrum efficiency (SE) versus
energy efficiency (EE), deployment efficiency (DE) versus energy efficiency
(EE), delay (DL) versus power (PW), and bandwidth (BW) versus power (PW). In
this paper, we first provide a comprehensive overview on the extensive on-going
research efforts and categorize them based on the fundamental green tradeoffs.
We will then focus on research progresses of 4G and 5G communications, such as
orthogonal frequency division multiplexing (OFDM) and non-orthogonal
aggregation (NOA), multiple input multiple output (MIMO), and heterogeneous
networks (HetNets). We will also discuss potential challenges and impacts of
fundamental green tradeoffs, to shed some light on the energy efficient
research and design for future wireless networks.


title:
Engineering bandgaps of monolayer MoS2 and WS2 on fluoropolymer
  substrates by electrostatically tuned many-body effects

abstract:
  Intrinsic electrical and excitonic properties of monolayer transition metal
dichalcogenides are studied on CYTOP fluoropolymer substrates with greatly
suppressed unintentional doping and dielectric screening. Ambipolar transport
behavior is observed in monolayer WS2 by applying solid states backdates. The
excitonic properties of monolayer MoS2 and WS2 are determined by intricate
interplays between the bandage renormalization, Pauli blocking and carrier
screening against carrier doping.


title:
The Rotation-Activity Correlations in K and M dwarfs. I. Stellar
  parameters, compilations of $v\sin i$ and $P/\sin i$ for a large sample of
  late-K and M dwarfs

abstract:
  Reliable determination of Rotation-Activity Correlation (RAC's) depends on
precise measurements of the following stellar parameters: $T_{eff}$, parallax,
radius, metallicity, and rotational speed $v\sin i$. In this paper, our goal is
to focus on the determination of these parameters for a sample of K and M
dwarfs. In a future paper (Paper II), we will combine our rotational data with
activity data in order to construct RAC's.
  Here, we report on a determination of effective temperatures based on the
(R-I)$_C$ color from the calibrations of Mann et al. (2015) and Kenyon \&
Hartmann (1995) for four samples of late-K, dM2, dM3 and dM4 stars. We also
determine stellar parameters ($T_{eff}$, $log(g)$ and [M/H]) using the
PCA-based inversion technique for a sample of 105 late-K dwarfs. We compile all
effective temperatures from the literature for this sample. We determine
empirical radius-[M/H] correlations in our stellar samples. This allows us to
propose new effective temperatures, stellar radii, and metallicities for a
large sample of 612 late-K and M dwarfs. Our mean radii agree well with those
of Boyajian et al. (2012).
  We analyze HARPS and SOPHIE spectra of 105 late-K dwarfs, and have detected
$v\sin i$ in 92 stars. In combination with our previous $v\sin i$ measurements
in M and K dwarfs, we now derive $P/sin i$ measures for a sample of 418 K and M
dwarfs. We investigate the distributions of $P/sin i$ and we show that they are
different from one spectral sub-type to another at a 99.9\% confidence level.


title: Electroweak radiative corrections to triple photon production at the ILC

abstract:
  In this paper, we present the precision predictions for three photon
production in the standard model (SM) at the ILC including the full
next-to-leading (NLO) electroweak (EW) corrections, high order initial state
radiation (h.o.ISR) contributions and beamstrahlung effects. We present the LO
and the NLO EW+h.o.ISR+beamstrahlung corrected total cross sections for various
colliding energy when $\sqrt s \ge 200 {\rm GeV}$ and the kinematic
distributions of final photons with $\sqrt s = 500 {\rm GeV}$ at ILC, and find
that the NLO EW corrections, the h.o.ISR contributions and the beamstrahlung
effects are important in exploring the process $e^+e^- \to \gamma\gamma\gamma$.


title:
Global regularities of two-dimensional density patch for inhomogeneous
  incompressible viscous flow with general density

abstract:
  Toward the open question proposed by P.-L. Lions in \cite{Lions96} concerning
the propagation of regularities of density patch for viscous inhomogeneous
flow, we first establish the global in time well-posedness of two-dimensional
inhomogeneous incompressible Navier-Stokes system with initial density being of
the form: $\eta_1{\bf 1}_{\Om_0}+\eta_2{\bf 1}_{\Om_0^c},$ for any pair of
positive constants $(\eta_1,\eta_2),$ and for any bounded, simply connected
$W^{k+2,p}(\R^2)$ domain $\Om_0.$ We then prove that the time evolved domain
$\Om(t)$ also belongs to the class of $W^{k+2,p}$ for any $t>0.$ Thus in some
sense, we have solved the aforementioned Lions' question %of density patch in
\cite{Lions96} in the two-dimensional case. Compared with our previous paper
\cite{LZ}, here we remove the smallness condition on the jump,
$|\eta_1-\eta_2|,$ moreover, the techniques used in the present paper are
completely different from those in \cite{LZ}.


title:
Existence, Lifespan and Transfer Rate of Ricci Flows on Manifolds with
  Small Ricci Curvature

abstract:
  We show that in dimension 4 and above, the lifespan of Ricci flows depends on
the relative smallness of the Ricci curvature compared to the Riemann curvature
on the initial manifold. We can generalize this lifespan estimate to the local
Ricci flow, using which we prove the short-time existence of Ricci flow
solutions on noncompact Riemannian manifolds with at most quadratic curvature
growth, whose Ricci curvature and its first two derivatives are sufficiently
small in regions where the Riemann curvature is large. Those Ricci flow
solutions may have unbounded curvature. Moreover, our method implies that,
under some appropriate assumptions, the spatial transfer rate (the rate at
which high curvature regions affect low curvature regions) of the Ricci flow
resembles that of the heat equation.


title: Iterative $\ell_1$ minimization for non-convex compressed sensing

abstract:
  An algorithmic framework, based on the difference of convex functions
algorithm (DCA), is proposed for minimizing a class of concave sparse metrics
for compressed sensing problems. The resulting algorithm iterates a sequence of
$\ell_1$ minimization problems. An exact sparse recovery theory is established
to show that the proposed framework always improves on the basis pursuit
($\ell_1$ minimization) and inherits robustness from it. Numerical examples on
success rates of sparse solution recovery illustrate further that, unlike most
existing non-convex compressed sensing solvers in the literature, our method
always out-performs basis pursuit, no matter how ill-conditioned the
measurement matrix is. Moreover, the iterative $\ell_1$ (IL$_1$) algorithm lead
by a wide margin the state-of-the-art algorithms on $\ell_{1/2}$ and
logarithimic minimizations in the strongly coherent (highly ill-conditioned)
regime, despite the same objective functions. Last but not least, in the
application of magnetic resonance imaging (MRI), IL$_1$ algorithm easily
recovers the phantom image with just 7 line projections.


title: Permutation-invariant qudit codes from polynomials

abstract:
  A permutation-invariant quantum code on $N$ qudits is any subspace stabilized
by the matrix representation of the symmetric group $S_N$ as permutation
matrices that permute the underlying $N$ subsystems. When each subsystem is a
complex Euclidean space of dimension $q \ge 2$, any permutation-invariant code
is a subspace of the symmetric subspace of $(\mathbb C^q)^N.$ We give an
algebraic construction of new families of of $d$-dimensional
permutation-invariant codes on at least $(2t+1)^2(d-1)$ qudits that can also
correct $t$ errors for $d \ge 2$. The construction of our codes relies on a
real polynomial with multiple roots at the roots of unity, and a sequence of
$q-1$ real polynomials that satisfy some combinatorial constraints. When $N >
(2t+1)^2(d-1)$, we prove constructively that an uncountable number of such
codes exist.


title:
Effects of electrically charged dark matter on cosmic microwave
  background anisotropies

abstract:
  We examine the possibility that dark matter consists of charged massive
particles (CHAMPs) in view of the cosmic microwave background (CMB)
anisotropies. The evolution of cosmological perturbations of CHAMP with other
components is followed in a self-consistent manner, without assuming that CHAMP
and baryons are tightly coupled. We incorporate for the first time the "kinetic
re-coupling" of the Coulomb scattering, which is characteristic of heavy
CHAMPs. By a direct comparison of the predicted CMB temperature/polarization
auto-correlations in CHAMP models and the observed spectra in the Planck
mission, we show that CHAMPs leave sizable effects on CMB spectra if they are
lighter than $10^{11}\,{\rm GeV}$. Our result can be applicable to any CHAMP as
long as its lifetime is much longer than the cosmic time at the recombination
($\sim 4 \times 10^{5}\, {\rm yr}$). An application to millicharged particles
is also discussed.


title:
Investigation of the physical properties of the Ce2MAl7Ge4 (M = Co, Ir,
  Ni, Pd) heavy fermion compounds

abstract:
  We report the synthesis, crystal structure and characterization by means of
single crystal x-ray diffraction, neutron powder diffraction, magnetic, thermal
and transport measurements of the new heavy fermion compounds
Ce$_{2}$MAl$_{7}$Ge$_{4}$ (M = Co, Ir, Ni, Pd). These compounds crystallize in
a noncentrosymmetic tetragonal space group P\={4}2$_{1}$m, consisting of layers
of square nets of Ce atoms separated by Ge-Al and M-Al-Ge blocks.
Ce$_{2}$CoAl$_{7}$Ge$_{4}$, Ce$_{2}$IrAl$_{7}$Ge$_{4}$ and
Ce$_{2}$NiAl$_{7}$Ge$_{4}$ order magnetically behavior below $T_{M}=$ 1.8, 1.6,
and 0.8 K, respectively. There is no evidence of magnetic ordering in
Ce$_{2}$PdAl$_{7}$Ge$_{4}$ down to 0.4 K. The small amount of entropy released
in the magnetic state of Ce$_{2}$MAl$_{7}$Ge$_{4}$ (M = Co, Ir, Ni) and the
reduced specific heat jump at $T_M$ suggest a strong Kondo interaction in these
materials. Ce$_{2}$PdAl$_{7}$Ge$_{4}$ shows non-Fermi liquid behavior, possibly
due to the presence of a nearby quantum critical point.


title: Distributed Flexible Nonlinear Tensor Factorization

abstract:
  Tensor factorization is a powerful tool to analyse multi-way data. Compared
with traditional multi-linear methods, nonlinear tensor factorization models
are capable of capturing more complex relationships in the data. However, they
are computationally expensive and may suffer severe learning bias in case of
extreme data sparsity. To overcome these limitations, in this paper we propose
a distributed, flexible nonlinear tensor factorization model. Our model can
effectively avoid the expensive computations and structural restrictions of the
Kronecker-product in existing TGP formulations, allowing an arbitrary subset of
tensorial entries to be selected to contribute to the training. At the same
time, we derive a tractable and tight variational evidence lower bound (ELBO)
that enables highly decoupled, parallel computations and high-quality
inference. Based on the new bound, we develop a distributed inference algorithm
in the MapReduce framework, which is key-value-free and can fully exploit the
memory cache mechanism in fast MapReduce systems such as SPARK. Experimental
results fully demonstrate the advantages of our method over several
state-of-the-art approaches, in terms of both predictive performance and
computational efficiency. Moreover, our approach shows a promising potential in
the application of Click-Through-Rate (CTR) prediction for online advertising.


title: A symmetry breaking transition in the edge/triangle network model

abstract:
  Our general subject is the emergence of phases, and phase transitions, in
large networks subjected to a few variable constraints. Our main result is the
analysis, in the model using edge and triangle subdensities for constraints, of
a sharp transition between two phases with different symmetries, analogous to
the transition between a fluid and a crystalline solid.

categories: math.CO cond-mat.stat-mech cs.SI math.PR


title: Bulk Topological Superconductors

abstract:
  This review introduces known candidates for bulk topological superconductors
and categorizes them with time-reversal symmetry (TRS) and gap structures.
Recent studies on two archetypal topological superconductors, TRS-broken
Sr2RuO4 and TRS-preserved CuxBi2Se3, are described in some detail.


title:
Coexistence curves and molecule number densities of AdS black holes in
  the reduced parameter space

abstract:
  In this paper, we investigate the coexistence curves and molecule number
densities of $f(R)$ AdS black holes and Gauss-Bonnet AdS black holes.
Specifically, we work with the reduced parameter space and derive the analytic
expressions of the universal coexistence curves that are independent of theory
parameters. Moreover, we obtain the explicit expressions of the physical
quantity describing the difference of the number densities of black hole
molecules between the small and large black hole. It is found that both the
coexistence curve and the difference of the molecule number densities of $f(R)$
AdS black holes coincide with those of RN-AdS black holes. It may be attributed
to the same equation of state they share in the reduced parameter space. The
difference of the molecule number densities between the small and large
Gauss-Bonnet AdS black hole exhibits different behavior. This may be attributed
to the fact that the charge of RN-AdS black hole is non-trivial. Our research
will not only deepen the understanding of both the physics along the
coexistence curve and the underlying microscopic freedom of AdS black holes,
but also highlight the importance of the law of corresponding states.


title: Regularization of Kepler Problem in $\kappa$-spacetime

abstract:
  In this paper we regularize the Kepler problem on $\kappa$-spacetime in
several different ways. First, we perform a Moser-type regularization and then
we proceed for the Ligon-Schaaf regularization to our problem. In particular,
generalizing Heckman-de Laat (J. Symplectic Geom. 10, (2012), 463-473) in the
noncommutative context we show that the Ligon-Schaaf regularization map follows
from an adaptation of the Moser regularization can be generalized to the Kepler
problem on $\kappa$-spacetime.


title: Spin dynamics of large-spin (spinor) fermions in a harmonic trap

abstract:
  Understanding the collective dynamics in a many-body system has been a
central task in condensed matter physics. To achieve this task, we develop a
Hartree-Fock theory to study the collective oscillations of spinor Fermi
system, motivated by recent experiment on spin-9/2 fermions. We observe an
oscillation period shoulder for small rotation angles. Different from previous
studies, where the shoulder is found connected to the resonance from periodic
to running phase, here the system is always in a running phase in the two-body
phase space. This shoulder survives even in the many-body oscillations, which
could be tested in the experiments. We also show how these collective
oscillations evolve from two- to many-body. Our theory provides an alternative
way to understand the collective dynamics in large-spin Fermi systems.


title:
Impulsive perturbations to differential equations: stable/unstable
  pseudo-manifolds, heteroclinic connections, and flux

abstract:
  State-dependent time-impulsive perturbations to a two-dimensional autonomous
flow with stable and unstable manifolds are analysed by posing in terms of an
integral equation which is valid in both forwards- and backwards-time. The
impulses destroy the smooth invariant manifolds, necessitating new definitions
for stable and unstable pseudo-manifolds. Their time-evolution is characterised
by solving a Volterra integral equation of the second kind with discontinuous
inhomogeniety. A criteria for heteroclinic trajectory persistence in this
impulsive context is developed, as is a quantification of an instantaneous flux
across broken heteroclinic manifolds. Several examples, including a kicked
Duffing oscillator and an underwater explosion in the vicinity of an eddy, are
used to illustrate the theory.


title:
Line tension and morphology of a sessile droplet on a spherical
  substrate

abstract:
  The effects of line tension on the morphology of a sessile droplet placed on
top of a convex spherical substrate are studied. The morphology of the droplet
is determined from the global minimum of the Helmholtz free energy. The contact
angle between the droplet and the spherical substrate is expressed by the
generalized Young's formula. When the line tension is positive and large, the
contact angle jumps discontinuously to $180^{\circ}$, the circular contact line
shrinks towards the top of the substrate, and the droplet detaches from the
substrate, forming a spherical droplet if the substrate is hydrophobic (i.e.,
the Young's contact angle is large). This finding is consistent with that
predicted by Widom [J. Phys. Chem. {\bf 99}, 2803 (1995)]; the line tension
induces a drying transition on a flat substrate. On the other hand, the contact
angle jumps to $0^{\circ}$, the circular contact line shrinks towards the
bottom of the substrate, and the droplet spreads over the substrate to form a
wrapped spherical droplet if the substrate is hydrophilic (i.e., the Young's
contact angle is small). Therefore, not only the drying transition of a
cap-shaped to a detached spherical droplet but also the wetting transition of a
cap-shaped to a wrapped spherical droplet could occur on a spherical substrate
as the surface area of the substrate is finite. When the line tension is
negative and its magnitude increases, the contact line asymptotically
approaches the equator from either above or below. The droplet with a contact
line that coincides with the equator is an isolated, singular solution of the
first variational problem. In this instance, the contact line is pinned and
cannot move as far as the line tension is smaller than the critical magnitude,
where the wetting transition occurs.


title:
Imperfect traveling chimera states induced by local synaptic gradient
  coupling

abstract:
  In this paper we report the occurrence of chimera patterns in a network of
neuronal oscillators, which are coupled through {\it local}, synaptic {\it
gradient} coupling. We discover a new chimera pattern, namely the {\it
imperfect traveling chimera} where the incoherent traveling domain spreads into
the coherent domain of the network. Remarkably, we also find that chimera
states arise even for {\it one-way} local coupling, which is in contrast to the
earlier belief that only nonlocal, global or nearest neighbor local coupling
can give rise to chimera; this find further relaxes the essential connectivity
requirement of getting a chimera state. We choose a network of identical
bursting Hindmarsh-Rose neuronal oscillators and show that depending upon the
relative strength of the synaptic and gradient coupling several chimera
patterns emerge. We map all the spatiotemporal behaviors in parameter space and
identify the transitions among several chimera patterns, in-phase synchronized
state and global amplitude death state.


title:
Search for sub-millimeter H2O masers in active galaxies - the detection
  of a 321 GHz H2O maser in NGC4945

abstract:
  We present further results of a search for extragalactic submillimeter H2O
masers using the Atacama Large Millimeter/Submillimeter Array (ALMA). The
detection of a 321 GHz H2O maser in the nearby Type 2 Seyfert galaxy, the
Circinus galaxy, has previously been reported, and here the spectral analysis
of four other galaxies is described. We have discovered H2O maser emission at
321 GHz toward the center of NGC 4945, a nearby Type 2 Seyfert. The maser
emission shows Doppler-shifted velocity features with velocity ranges similar
to those of the previously reported 22 GHz H2O masers, however the
non-contemporaneous observations also show differences in velocity offsets. The
sub-parsec-scale distribution of the 22 GHz H2O masers revealed by earlier VLBI
(Very Long Baseline Interferometry) observations suggests that the
submillimeter masers could arise in an edge-on rotating disk. The maser
features remain unresolved by the synthesized beam of ~ 0.54 (~30 pc) and are
located toward the 321 GHz continuum peak within errors. A marginally detected
(3 sigma) high-velocity feature is redshifted by 579 km/s with respect to the
systemic velocity of the galaxy. Assuming that this feature is real and arises
from a Keplerian rotating disk in this galaxy, it is located at a radius of
~0.020 pc (~1.5 x 10^5 Schwarzschild radii), which would enable molecular
material closer to the central engine to be probed than the 22 GHz H2O masers.
This detection confirms that submillimeter H2O masers are a potential tracer of
the circumnuclear regions of active galaxies, which will benefit from higher
angular resolution studies with ALMA.


title:
Growth of Tall Vertical Carbon Nanotube Forests using Al-Fe Catalysts
  and Transfer to Flexible Substrates

abstract:
  Carbon nanotubes (CNTs) have found plenty of applications in electronics,
sensing, actuation, mechanical structures, etc. There is a growing demand to
produce large scale arrays of CNTs that can satisfy the requirements of cost
effective, quick and relatively simpler methods of growth. The other
conflicting requirement is to produce very high quality of CNTs in very high
densities and volumes. There has been considerable research that has gone into
resolving the above mentioned issues. Here we show that a significantly simple
and quick method of growing CNTs using Al-Fe thin film catalysts can also
produce very dense and tall forests of vertically aligned CNTs that can be
grown very uniformly over a substrate. We further show that this can be easily
transferred onto a flexible substrate like an adhesive tape.


title: Large-Scale Query-by-Image Video Retrieval Using Bloom Filters

abstract:
  We consider the problem of using image queries to retrieve videos from a
database. Our focus is on large-scale applications, where it is infeasible to
index each database video frame independently. Our main contribution is a
framework based on Bloom filters, which can be used to index long video
segments, enabling efficient image-to-video comparisons. Using this framework,
we investigate several retrieval architectures, by considering different types
of aggregation and different functions to encode visual information -- these
play a crucial role in achieving high performance. Extensive experiments show
that the proposed technique improves mean average precision by 24% on a public
dataset, while being 4X faster, compared to the previous state-of-the-art.


title: Multiple-pseudogap phases in hydrogen-doped LaFeAsO system

abstract:
  The low energy electronic structure of LaFeAsO1-xHx (0.0 < x < 0.60), the
system which exhibits two superconducting domes in its phase diagram, is
investigated by utilizing the laser photoemission spectroscopy. From the
precise temperature-dependent measurement of the spectra near the Fermi level,
we find the suppression of the density of states with cooling, namely the
pseudogap formation, for all doping range. The pseudogap in the low x range
(i.e. the first superconducting dome regime) gets suppressed with increasing x,
more or less similarly to the previous results in F-doped LaFeAsO system. On
the other hand, the pseudogap behavior in the second superconducting dome
regime at high-x becomes stronger with increasing the H-doping level. The
systematic doping dependence shows that the pseudogap is enhanced toward the
both ends of the phase diagram where the different types of antiferromagnetic
order exist.


title: From the 750 GeV Diphoton Resonance to Multilepton Excesses

abstract:
  Weakly-coupled models for the 750 GeV diphoton resonance often invoke new
particles carrying both color and/or electric charges to mediate loop-induced
couplings of the resonance to two gluons and two photons. The new colored
particles may not be stable and could decay into final states containing
standard model particles. We consider an electroweak doublet of vector-like
quarks (VLQs) carrying electric charges of 5/3 and 2/3, respectively, which
mediate the loop-induced couplings of the 750 GeV resonance. If the VLQ has a
mass at around 1 TeV, it naturally gives rise to the observed diphoton signal
strength while all couplings remain perturbative up to a high scale. At the
same time, if the charge-5/3 VLQ decays into final states containing top quark
and W boson, it would contribute to the multilepton excesses observed in both
Run 1 and Run 2 data. It is also possible to incorporate a dark matter
candidate in the decay final states to explain the observed relic density.


title: Diamagnetic pumping in a rotating convection zone

abstract:
  Solar dynamo models require some mechanism for magnetic field concentration
near the base of the convection zone in order to generate super-kilogauss
toroidal fields with sufficiently large (~10^{24} Mx) magnetic flux. We
consider the downward diamagnetic pumping near the base of the convection zone
as a possible concentration mechanism and derive the pumping velocities with
allowance for the effect of rotation. Transport velocities for poloidal and
toroidal fields differ in rotating fluid. The toroidal field is transported
downward along the radius only but the pumping velocity for the poloidal field
has an equatorward meridional component also. Previous results for cases of
slow and rapid rotation are reproduced and the diamagnetic pumping expressions
adapted for use in dynamo models are presented.


title:
Transition from homogeneous to inhomogeneous steady states in
  oscillators under cyclic coupling

abstract:
  We report a transition from homogeneous steady state to inhomogeneous steady
state in coupled oscillators, both limit cycle and chaotic, under cyclic
coupling and diffusive coupling as well when an asymmetry is introduced in
terms of a negative parameter mismatch. Such a transition appears in limit
cycle systems via pitchfork bifurcation as usual. Especially, when we focus on
chaotic systems, the transition follows a transcritical bifurcation for cyclic
coupling while it is a pitchfork bifurcation for the conventional diffusive
coupling. We use the paradigmatic Van der Pol oscillator as the limit cycle
system and a Sprott system as a chaotic system. We verified our results
analytically for cyclic coupling and numerically check all results including
diffusive coupling for both the limit cycle and chaotic systems.


title:
DASC: Robust Dense Descriptor for Multi-modal and Multi-spectral
  Correspondence Estimation

abstract:
  Establishing dense correspondences between multiple images is a fundamental
task in many applications. However, finding a reliable correspondence in
multi-modal or multi-spectral images still remains unsolved due to their
challenging photometric and geometric variations. In this paper, we propose a
novel dense descriptor, called dense adaptive self-correlation (DASC), to
estimate multi-modal and multi-spectral dense correspondences. Based on an
observation that self-similarity existing within images is robust to imaging
modality variations, we define the descriptor with a series of an adaptive
self-correlation similarity measure between patches sampled by a randomized
receptive field pooling, in which a sampling pattern is obtained using a
discriminative learning. The computational redundancy of dense descriptors is
dramatically reduced by applying fast edge-aware filtering. Furthermore, in
order to address geometric variations including scale and rotation, we propose
a geometry-invariant DASC (GI-DASC) descriptor that effectively leverages the
DASC through a superpixel-based representation. For a quantitative evaluation
of the GI-DASC, we build a novel multi-modal benchmark as varying photometric
and geometric conditions. Experimental results demonstrate the outstanding
performance of the DASC and GI-DASC in many cases of multi-modal and
multi-spectral dense correspondences.


title:
Instability of solitary waves for a generalized derivative nonlinear
  Schr\"odinger equation in a borderline case

abstract:
  We study the orbital instability of solitary waves for a generalized
derivative nonlinear Schr\"odinger equation. We give sufficient conditions for
instability of a two-parameter family of solitary waves in a degenerate case.


title:
Experimental measurement of plasmonic nanostructures embedded in silicon
  waveguide gaps

abstract:
  In this work, we report numerical simulations and experiments of the optical
response of a gold nanostrip embedded in a silicon strip waveguide gap at
telecom wavelengths. We show that the spectral features observed in
transmission and reflection when the metallic nanostructure is inserted in the
gap are extremely different to those observed in free-space excitation. First,
we find that interference between the guided field and the electric dipolar
resonance of the metallic nanostructure results in high-contrast (> 10)
spectral features showing an asymmetric Fano spectral profile. Secondly, we
reveal a crossing in the transmission and reflection responses close to the
nanostructure resonance wavelength as a key feature of our system. This
approach, which can be realized using standard semiconductor nanofabrication
tools, could lead to fully exploit the extreme properties of subwavelength
metallic nanostructures in an on-chip configuration, with special relevance in
fields such as biosensing or optical switching.


title:
Multifractality at non-Anderson disorder-driven transitions in Weyl
  semimetals and other systems

abstract:
  Systems with the power-law quasiparticle dispersion $\epsilon_{\bf k}\propto
k^\alpha$ exhibit non-Anderson disorder-driven transitions in dimensions
$d>2\alpha$, as exemplified by Weyl semimetals, 1D and 2D arrays of ultracold
ions with long-range interactions, quantum kicked rotors and semiconductor
models in high dimensions. We study the wavefunction structure in such systems
and demonstrate that at these transitions they exhibit fractal behaviour with
an infinite set of multifractal exponents. The multifractality persists even
when the wavefunction localisation is forbidden by symmetry or topology and
occurs as a result of elastic scattering between all momentum states in the
band on length scales shorter than the mean free path. We calculate explicitly
the multifractal spectra in semiconductors and Weyl semimetals using one-loop
and two-loop renormalisation-group approaches slightly above the marginal
dimension $d=2\alpha$.

categories: cond-mat.mes-hall cond-mat.dis-nn cond-mat.mtrl-sci cond-mat.quant-gas cond-mat.str-el


title:
Graph Laplacian Regularization for Image Denoising: Analysis in the
  Continuous Domain

abstract:
  Inverse imaging problems are inherently under-determined, and hence it is
important to employ appropriate image priors for regularization. One recent
popular prior---the graph Laplacian regularizer---assumes that the target pixel
patch is smooth with respect to an appropriately chosen graph. However, the
mechanisms and implications of imposing the graph Laplacian regularizer on the
original inverse problem are not well understood. To address this problem, in
this paper we interpret neighborhood graphs of pixel patches as discrete
counterparts of Riemannian manifolds and perform analysis in the continuous
domain, providing insights into several fundamental aspects of graph Laplacian
regularization for image denoising. Specifically, we first show the convergence
of the graph Laplacian regularizer to a continuous-domain functional,
integrating a norm measured in a locally adaptive metric space. Focusing on
image denoising, we derive an optimal metric space assuming non-local
self-similarity of pixel patches, leading to an optimal graph Laplacian
regularizer for denoising in the discrete domain. We then interpret graph
Laplacian regularization as an anisotropic diffusion scheme to explain its
behavior during iterations, e.g., its tendency to promote piecewise smooth
signals under certain settings. To verify our analysis, an iterative image
denoising algorithm is developed. Experimental results show that our algorithm
performs competitively with state-of-the-art denoising methods such as BM3D for
natural images, and outperforms them significantly for piecewise smooth images.


title:
Auxiliary Likelihood-Based Approximate Bayesian Computation in State
  Space Models

abstract:
  A computationally simple approach to inference in state space models is
proposed, using approximate Bayesian computation (ABC). ABC avoids evaluation
of an intractable likelihood by matching summary statistics for the observed
data with statistics computed from data simulated from the true process, based
on parameter draws from the prior. Draws that produce a 'match' between
observed and simulated summaries are retained, and used to estimate the
inaccessible posterior. With no reduction to a low-dimensional set of
sufficient statistics being possible in the state space setting, we define the
summaries as the maximum of an auxiliary likelihood function, and thereby
exploit the asymptotic sufficiency of this estimator for the auxiliary
parameter vector. We derive conditions under which this approach - including a
computationally efficient version based on the auxiliary score - achieves
Bayesian consistency. To reduce the well-documented inaccuracy of ABC in
multi-parameter settings, we propose the separate treatment of each parameter
dimension using an integrated likelihood technique. Three stochastic volatility
models for which exact Bayesian inference is either computationally
challenging, or infeasible, are used for illustration. We demonstrate that our
approach compares favorably against an extensive set of approximate and exact
comparators. An empirical illustration completes the paper.


title:
Collective spin excitations in bi-component magnonic crystals consisting
  of bi-layer Permalloy/Fe nanowires

abstract:
  In the developing field of magnonics,it is very important to achieve
tailoring of spin wave propagation by both a proper combination of materials
with different magnetic properties and their nanostructuring on the
submicrometric scale. We have exploited deep ultra-violet lithography, in
combination with tilted shadow deposition technique, to fabricate arrays of
closely spaced bi-layer nanowires (NWs), with separation d=100 nm and
periodicity a=440 nm, having bottom and top layers made of Permalloy and Iron,
respectively. The NWs have either rectangular cross section (bottom and upper
layers of equal width) or L-shaped cross section (upper layer of half width).
The frequency dispersion of collective spin wave excitations in the above
bi-layered NWs arrays has been measured by the Brillouin light scattering
technique while sweeping the wave vector perpendicularly to the wire length
over three Brillouin zones of the reciprocal space. For the rectangular NWs,
the lowest frequency fundamental mode, characterized by a quasi- uniform
profile of the amplitude of the dynamic magnetization across the NW width,
exhibits a sizeable and periodic frequency dispersion. A similar dispersive
mode is also present in L-shaped NWs, but the mode amplitude is concentrated in
the thin side of the NWs. The width and the center frequency of the magnonic
band associated with the above fundamental modes has been analyzed, showing
that both can be tuned by varying the external applied field. Moreover, for the
L-shaped NWs it is shown that there is also a second dispersive mode,at higher
frequency,characterized by an amplitude concentrated in the thick side of the
NW. These experimental results have been quantitatively reproduced by an
original numerical model that includes two-dimensional Green's function of the
dipole field of the dynamic magnetization and interlayer exchange coupling
between the layers.


title:
Dynamics of Local Symmetry Correlators for Interacting Many-Particle
  Systems

abstract:
  Recently (PRL 113, 050403 (2014)) the concept of local symmetries in
one-dimensional stationary wave propagation has been shown to lead to a class
of invariant two-point currents that allow to generalize the parity and Bloch
theorem. In the present work we establish the theoretical framework of local
symmetries for higher-dimensional interacting many-body systems. Based on the
Bogoliubov-Born-Green-Kirkwood-Yvon (BBGKY) hierarchy we derive the equations
of motion of local symmetry correlators which are off-diagonal elements of the
reduced one-body density matrix at symmetry related positions. The natural
orbital representation yields equations of motion for the convex sum of the
local symmetry correlators of the natural orbitals as well as for the local
symmetry correlators of the individual orbitals themselves. An alternative
integral representation with a unique interpretation is provided. We discuss
special cases, such as the bosonic and fermionic mean field theory and show in
particular that the invariant two-point currents are recovered in the case of
the non-interacting one-dimensional stationary wave propagation. Finally we
derive the equations of motion for anomalous local symmetry correlators which
indicate the breaking of a global into a local symmetry in the stationary
non-interacting case.


title: Zero-shot object prediction using semantic scene knowledge

abstract:
  This work focuses on the semantic relations between scenes and objects for
visual object recognition. Semantic knowledge can be a powerful source of
information especially in scenarios with few or no annotated training samples.
These scenarios are referred to as zero-shot or few-shot recognition and often
build on visual attributes. Here, instead of relying on various visual
attributes, a more direct way is pursued: after recognizing the scene that is
depicted in an image, semantic relations between scenes and objects are used
for predicting the presence of objects in an unsupervised manner. Most
importantly, relations between scenes and objects can easily be obtained from
external sources such as large scale text corpora from the web and, therefore,
do not require tremendous manual labeling efforts. It will be shown that in
cluttered scenes, where visual recognition is difficult, scene knowledge is an
important cue for predicting objects.


title: Simultaneous Food Localization and Recognition

abstract:
  The development of automatic nutrition diaries, which would allow to keep
track objectively of everything we eat, could enable a whole new world of
possibilities for people concerned about their nutrition patterns. With this
purpose, in this paper we propose the first method for simultaneous food
localization and recognition. Our method is based on two main steps, which
consist in, first, produce a food activation map on the input image (i.e. heat
map of probabilities) for generating bounding boxes proposals and, second,
recognize each of the food types or food-related objects present in each
bounding box. We demonstrate that our proposal, compared to the most similar
problem nowadays - object localization, is able to obtain high precision and
reasonable recall levels with only a few bounding boxes. Furthermore, we show
that it is applicable to both conventional and egocentric images.


title: Towards a simple characterization of the Chern-Schwartz-MacPherson class

abstract:
  For a large class of possibly singular complete intersections we prove a
formula for their Chern-Schwartz-MacPherson classes in terms of a single blowup
along a scheme supported on the singular loci of such varieties. In the
hypersurface case our formula recovers a formula of Aluffi proven in 1996. As
our formula is in no way tailored to the complete intersection hypothesis, we
conjecture that it holds for all closed subschemes of a smooth variety. If in
fact true, such a formula would provide a simple characterization of the
Chern-Schwartz-MacPherson class which does not depend on a resolution of
singularities. We also show that our formula may be suitably interpreted as the
Chern-Fulton class of a scheme-like object which we refer to as an
`$\mathfrak{f}$-scheme'.


title:
Occurrence of instability through the protostellar accretion disks by
  landing of low-mass condensations

abstract:
  Low-mass condensations (LMCs) are observed inside the envelope of the
collapsing molecular cloud cores. In this research, we investigate the effects
of landing LMCs for occurrence of instability through the protostellar
accretion disks. We consider some regions of the disk where duration of
infalling and landing of the LMCs are shorter than the orbital period. In this
way, we can consider the landing LMCs as density bumps and grooves in the
azimuthal direction of an initial thin axisymmetric steady state
self-gravitating protostellar accretion disk (nearly Keplerian). Using the
linear effects of the bump quantities, we obtain a characteristic equation for
growth/decay rate of bumps; we numerically solve it to find occurrence of
instability. We also evaluate the minimum-growth-time-scale (MGTS) and the
enhanced mass accretion rate. The results show that infalling and landing of
the LMCs in the inner regions of the protostellar accretion disks can cause
faster unstable modes and less enhanced accretion rates relative to the outer
regions. Also, more fragmentation of landed LMCs in the azimuthal direction
have less chance for instability, and then can produce more values of enhanced
mass accretion rate.


title:
State-conditional coherent charge qubit oscillations in a Si/SiGe
  quadruple quantum dot

abstract:
  Universal quantum computation requires high fidelity single qubit rotations
and controlled two qubit gates. Along with high fidelity single qubit gates,
strong efforts have been made in developing robust two qubit logic gates in
electrically-gated quantum dot systems to realize a compact and
nano-fabrication-compatible architecture. Here, we perform measurements of
state-conditional coherent oscillations of a charge qubit. Using a quadruple
quantum dot formed in a Si/SiGe heterostructure, we show the first
demonstration of coherent two-axis control of a double quantum dot charge qubit
in undoped Si/SiGe, performing Larmor and Ramsey oscillation measurements. We
extract the strength of the capacitive coupling between double quantum dots by
measuring the detuning energy shift ($\approx$ 75 $\mu$eV) of one double dot
depending on the excess charge configuration of the other double dot. We
further demonstrate that the strong capacitive coupling allows fast conditional
Landau-Zener-Stuckelberg interferences with conditonal $\pi$ phase flip time
about 80 ps, showing promising pathways toward multi-qubit entanglement control
in semiconductor quantum dots.


title:
Degrees of Freedom of Full-Duplex Cellular Networks with Reconfigurable
  Antennas at Base Station

abstract:
  Full-duplex (FD) cellular networks are considered in which a FD base station
(BS) simultaneously supports a set of half-duplex (HD) downlink (DL) users and
a set of HD uplink (UL) users. The transmitter and the receiver of the BS are
equipped with reconfigurable antennas, each of which can choose its transmit or
receive mode from several preset modes. Under the no self-interference
assumption arisen from FD operation at the BS, the sum degrees of freedom (DoF)
of FD cellular networks is investigated for both no channel state information
at the transmit side (CSIT) and partial CSIT. In particular, the sum DoF is
completely characterized for no CSIT model and an achievable sum DoF is
established for the partial CSIT model, which improves the sum DoF of the
conventional HD cellular networks. For both no CSIT and partial CSIT models,
the results show that the FD BS with reconfigurable antennas can double the sum
DoF even in the presence of user-to-user interference as both the numbers of DL
and UL users and preset modes increase. It is further demonstrated that such
DoF improvement indeed yields the sum rate improvement at the finite and
operational signal-to-noise ratio regime.


title: Superconductivity at 7.8 K in the ternary LaRu2As2 compound

abstract:
  Here we report the discovery of superconductivity in the ternary LaRu2As2
compound. The polycrystalline LaRu2As2 samples were synthesized by the
conventional solid state reaction method. Powder X-ray diffraction analysis
indicates that LaRu2As2 crystallizes in the ThCr2Si2-type crystal structure
with the space group I4/mmm (No. 139), and the refined lattice parameters are a
= 4.182(6) {\AA} and c = 10.590(3) {\AA}. The temperature dependent resistivity
measurement shows a clear superconducting transition with the onset Tc
(critical temperature) at 7.8 K, and zero resistivity happens at 6.8 K. The
upper critical field at zero temperature m0Hc2(0) was estimated to be 1.6 T
from the resistivity measurement. DC magnetic susceptibility measurement shows
a bulk superconducting Meissner transition at 7.0 K, and the isothermal
magnetization measurement indicates that LaRu2As2 is a type-II superconductor.


title: First-principles simulations of glass-formers

abstract:
  In this article we review results of computer simulation of glasses carried
out using first principles approaches, notably density functional theory. We
start with a brief introduction to this method and compare the pros and cons of
this approach with the ones of simulations with classical potentials. This is
followed by a discussion of simulation results of various glass-forming systems
that have been obtained via ab initio simulations and that demonstrate the
usefulness of this approach to understand the properties of glasses on the
microscopic level.


title:
Delta(1232) contribution to real photon radiative corrections for
  elastic electron-proton scattering

abstract:
  Here we consider a contribution of Delta(1232) resonance to real photon
radiative corrections for elastic $ep$-scattering. The effect is found to be
small for past experiments to study unpolarized cross section as well as for
the recent VEPP-3 experiment to investigate two-photon exchange effects by
precision measurement of $e^\pm p$-scattering cross sections ratio.


title: Self-assembly of repulsive interfacial particles via collective sinking

abstract:
  Charged colloidal particles trapped at an air--water interface are well known
to form an ordered crystal, stabilized by a long ranged repulsion, the details
of this repulsion remain something of a mystery, but all experiments performed
to date have confirmed a dipolar-repulsion, at least at dilute concentrations.
More complex arrangements are often observed, especially at higher
concentration, and these seem to be incompatible with a purely repulsive
potential. In addition to electrostatic repulsion, interfacial particles may
also interact via deformation of the surface: so-called capillary effects.
Pair-wise capillary interactions are well understood, and are known to be too
small (for these colloidal particles) to overcome thermal effects. Here we show
that collective effects may significantly modify the simple pair-wise
interactions and become important at higher density, though we remain well
below close packing throughout. In particular, we show that the interaction of
many interfacial particles can cause much larger interfacial deformations than
do isolated particles, and show that the energy of interaction per particle due
to this "collective sinking" grows as the number of interacting particles
grows. Though some of the parameters in our simple model are unknown, the
scaling behaviour is entirely consistent with experimental data, strongly
indicating that estimating interaction energy based solely on pair-wise
potentials may be too simplistic for surface particle layers.


title:
Poincar\'e map construction for some classical two predators - one prey
  systems

abstract:
  In this paper we consider a family of system with 2 predators feeding on one
prey. We show how to construct a positively invariant set in which it is
possible to define a Poincar\'e map for examining the behaviour of the system,
mainly in the case when both predators survive. We relate it to examples from
earlier works.


title: Roughening of an interface in a system with surface or bulk disorder

abstract:
  We study numerically the roughening properties of an interface in a
two-dimensional Ising model with either random bonds or random fields, which
are representative of universality classes where disorder acts only on the
interface or also away from it, in the bulk. The dynamical structure factor
shows a rich crossover pattern from the form of a pure system at large
wavevectors $k$, to a different behavior, typical of the kind of disorder, at
smaller $k$'s. For the random field model a second crossover is observed from
the typical behavior of a system where disorder is only effective on the
surface, as the random bond model, to the truly large scale behavior, where
bulk-disorder is important, that is observed at the smallest wavevectors.


title:
Thermodynamic Properties of a Nucleon under the Generalized Symmetric
  Woods-Saxon Potential in Flourine 17 Isotope

abstract:
  The exact analytical solution of the Schr\"odinger equation for a generalized
symmetrical Woods-Saxon potential are examined for a nucleon in Fluorine 17
nucleus for bound and quasi-bound states in one dimension. The wave functions
imply that the nucleon is completely confined within the nucleus, i.e., no
decay probability for bound states, while tunneling probabilities arise for the
quasi-bound state. We have calculated the temperature dependent Helmholtz free
energies, the internal energies, the entropies and the specific heat capacities
of the system. It is shown that, when the quasi-bound state is included, the
internal energy and entropy increase, while the Helmholtz energy decreases at
high temperatures. Very high excitation temperatures imply that the nucleus
does not tend to release a nucleon. The calculated quasi bound state energy is
in reasonable agreement with the experimental data on the cumulative fission
energy issued by IAEA.


title:
Dense ionic fluids confined in planar capacitors: in- and out-of-plane
  structure from classical density functional theory

abstract:
  The ongoing scientific interest in the properties and structure of electric
double layers (EDLs) stems from their pivotal role in (super)capacitive energy
storage, energy harvesting, and water treatment technologies. Classical density
functional theory (DFT) is a promising framework for the study of the in- and
out-of-plane structural properties of double layers. Supported by molecular
dynamics simulations, we demonstrate the adequate performance of DFT for
analyzing charge layering in the EDL perpendicular to the electrodes. We
discuss charge storage and capacitance of the EDL and the impact of screening
due to dielectric solvents. We further calculate, for the first time, the
in-plane structure of the EDL within the framework of DFT. While our
out-of-plane results already hint at structural in-plane transitions inside the
EDL, which have been observed recently in simulations and experiments, our DFT
approach performs poorly in predicting in-plane structure in comparison to
simulations. However, our findings isolate fundamental issues in the
theoretical description of the EDL within the primitive model and point towards
limitations in the performance of DFT in describing the out-of-plane structure
of the EDL at high concentrations and potentials.


title:
Scale heights and equivalent widths of the iron K-shell lines in the
  Galactic diffuse X-ray emission

abstract:
  This paper reports the analysis of the X-ray spectra of the Galactic diffuse
X-ray emission (GDXE) in the Suzaku archive. The fluxes of the Fe I K alpha
(6.4 keV), Fe XXV,He alpha (6.7 keV) and Fe XXVI Ly alpha (6.97 keV) lines are
separately determined. From the latitude distributions, we confirm that the
GDXE is decomposed into the Galactic center (GCXE), the Galactic bulge (GBXE)
and the Galactic ridge (GRXE) X-ray emissions. The scale heights (SHs) of the
Fe XXV He alpha line of the GCXE, GBXE and GRXE are determined to be ~40, ~310
and ~140 pc, while those of the Fe I K alpha line are ~30, ~160 and ~70 pc,
respectively. The mean equivalent widths (EWs) of the sum of the Fe XXV He
alpha and Fe XXVI Ly alpha lines are ~750 eV, ~600 eV and ~550 eV, while those
of the Fe I K alpha line are ~150~eV, ~60~eV and ~100~eV for the GCXE, GBXE and
GRXE, respectively. The origin of the GBXE, GRXE and GCXE is separately
discussed based on the new results of the SHs and EWs, in comparison with those
of the Cataclysmic Variables (CVs), Active Binaries (ABs) and Coronal Active
stars (CAs).


title: Reduced and nonreduced presentations of Weyl group elements

abstract:
  This paper is a sequel to work of Dynkin on subroot lattices of root lattices
and to work of Carter on presentations of Weyl group elements as products of
reflections. The quotients $L/L_1$ are calculated for all irreducible root
lattices $L$ and all subroot lattices $L_1$. The reduced (i.e. those with
minimal number of reflections) presentations of Weyl group elements as products
of arbitrary reflections are classified. Also nonreduced presentations are
studied. Quasi Coxeter elements and strict quasi Coxeter elements are defined
and classified. An application to extended affine root lattices is given. A
side result is that any set of roots which generates the root lattice contains
a $Z$-basis of the root lattice.


title:
Magneto-acoustic study near the quantum critical point of the frustrated
  quantum antiferromagnet Cs2CuCl4

abstract:
  Magneto-acoustic investigations of the frustrated triangular-lattice
antiferromagnet Cs2CuCl4 were performed for the longitudinal modes c11 and c33
in magnetic fields along the a-axis. The temperature dependence of the sound
velocity at zero field shows a mild softening at low temperature and displays a
small kink-like anomaly at TN. Isothermal measurements at T < TN of the sound
attenuation reveal two closely-spaced features of different character on
approaching the materials quantum-critical point (QCP) around Bs = 8.5 T for B
// a. The peak at slightly lower fields remains sharp down to the lowest
temperature and can be attributed to the ordering temperature TN(B). The second
anomaly which is rounded and which becomes reduced in size upon cooling is
assigned to the materials spin-liquid properties preceding the long-range
antiferromagnetic ordering. These two features merge upon cooling suggesting a
coincidence at the QCP. The elastic constant at lowest temperatures of our
experiment at 32 mK can be well described by a Landau free energy model with a
very small magnetoelastic coupling constant G/kB = 2.8 K. The applicability of
this classical model indicates the existence of a small gap in the magnetic
excitation spectrum which drives the system away from quantum criticality.


title:
On the Surprising Explanatory Power of Higher Realized Moments in
  Practice

abstract:
  Realized moments of higher order computed from intraday returns are
introduced in recent years. The literature indicates that realized skewness is
an important factor in explaining future asset returns. However, the literature
mainly focuses on the whole market and on the monthly or weekly scale. In this
paper, we conduct an extensive empirical analysis to investigate the
forecasting abilities of realized skewness and realized kurtosis towards
individual stock's future return and variance in the daily scale. It is found
that realized kurtosis possesses significant forecasting power for the stock's
future variance. In the meanwhile, realized skewness is lack of explanatory
power for the future daily return for individual stocks with a short horizon,
in contrast with the existing literature.


title:
Stationary measures and phase transition for a class of probabilistic
  cellular automata

abstract:
  We discuss various properties of Probabilistic Cellular Automata, such as the
structure of the set of stationary measures and multiplicity of stationary
measures (or phase transition) for reversible models.


title: Influence of nonlocal damping on the field-driven domain wall motion

abstract:
  We derive the complete expression of nonlocal damping in noncollinear
magnetization due to the nonuniform spin current pumped by precessional
magnetization and incorporate it into a generalized Thiele equation to study
its effects on the dynamics of the transverse and vortex domain walls (DWs) in
ferromagnetic nanowires. We demonstrate that the transverse component of
nonlocal damping slows down the field-driven DW propagation and increases the
Walker breakdown field whereas it is neglected in many previous works in
literature. The experimentally measured DW mobility variation with the damping
tuned by doping with heavy rare-earth elements that had discrepancy from
micromagnetic simulation are now well understood with the nonlocal damping. Our
results suggest that the nonlocal damping should be properly included as a
prerequisite for quantitative studies of current-induced torques in
noncollinear magnetization.


title: Physical and unphysical solutions of random-phase approximation equation

abstract:
  Properties of solutions of the RPA equation is reanalyzed mathematically,
which is defined as a generalized eigenvalue problem of the stability matrix
$\mathsf{S}$ with the norm matrix $\mathsf{N}=\mathrm{diag.}(1,-1)$. As well as
physical solutions, unphysical solutions are examined in detail, with taking
the possibility of Jordan blocks of the matrix $\mathsf{N\,S}$ into
consideration. Two types of duality of eigenvectors and basis vectors of the
Jordan blocks are pointed out and explored, which disclose many basic
properties of the RPA solutions.


title: Reference and Structure of Software Engineering Theories

abstract:
  This paper tries to contribute towards the solution of an important question
raised in the SE literature: What is a Software Engineering (SE) specific
theory? Which are the main features of a theory that is endemic to SE? In this
paper we will use 'theory' as the term is used in traditional sciences. Other
uses of the term 'theory' are discussed. Finally, we propose to focus on the
reference class and on the structuring of SE theories as a basis for further
progress.


title:
Non-convexity of private capacity and classical environment-assisted
  capacity of a quantum channel

abstract:
  The capacity of classical channels is convex. This is not the case for the
quantum capacity of a channel: the capacity of a mixture of different quantum
channels exceeds the mixture of the individual capacities and thus is
non-convex. Here we show that this effect goes beyond the quantum capacity and
holds for the private and classical environment-assisted capacities of quantum
channels.


title: S-Channel Dark Matter Simplified Models and Unitarity

abstract:
  The ultraviolet structure of $s$-channel mediator dark matter simplified
models at hadron colliders is considered. In terms of commonly studied
$s$-channel mediator simplified models it is argued that at arbitrarily high
energies the perturbative description of dark matter production in high energy
scattering at hadron colliders will break down in a number of cases. This is
analogous to the well documented breakdown of an EFT description of dark matter
collider production. With this in mind, to diagnose whether or not the use of
simplified models at the LHC is valid, perturbative unitarity of the scattering
amplitude in the processes relevant to LHC dark matter searches is studied. The
results are as one would expect: at the LHC and future proton colliders the
simplified model descriptions of dark matter production are in general valid.
As a result of the general discussion, a simple new class of previously
unconsidered `Fermiophobic Scalar' simplified models is proposed, in which a
scalar mediator couples to electroweak vector bosons. The Fermiophobic
simplified model is well motivated and exhibits interesting collider and direct
detection phenomenology.


title:
Smaller Extended Formulations for the Spanning Tree Polytope of
  Bounded-genus Graphs

abstract:
  We give an $O(g^{1/2} n^{3/2} + g^{3/2} n^{1/2})$-size extended formulation
for the spanning tree polytope of an $n$-vertex graph embedded on a surface of
genus $g$, improving on the known $O(n^2 + g n)$-size extended formulations
following from Wong and Martin.


title: Some divisibility properties of q-Fibonacci numbers

abstract:
  We give a survey of some known and some new results about factors of
different sorts of $q-$Fibonacci numbers.


title: UV Photosensing Characteristics of Nanowire-Based GaN/AlN Superlattices

abstract:
  We have characterized the photodetection capabilities of single GaN nanowires
incorporating 20 periods of AlN/GaN:Ge axial heterostructures enveloped in an
AlN shell. Transmission electron microscopy confirms the absence of an
additional GaN shell around the heterostructures. In the absence of a surface
conduction channel, the incorporation of the heterostructure leads to a
decrease of the dark current and an increase of the photosensitivity. A
significant dispersion in the magnitude of dark currents for different single
nanowires is attributed to the coalescence of nanowires with displaced
nanodisks, reducing the effective length of the heterostructure. A larger
number of active nanodisks and AlN barriers in the current path results in
lower dark current and higher photosensitivity, and improves the sensitivity of
the nanowire to variations in the illumination intensity (improved linearity).
Additionally, we observe a persistence of the photocurrent, which is attributed
to a change of the resistance of the overall structure, particularly the GaN
stem and cap sections. In consequence, the time response is rather independent
of the dark current.


title: Boundedness and closedness of linear relations

abstract:
  This paper studies boundedness and closedness of linear relations, which
include both single-valued and multi-valued linear operators. A new
(single-valued) linear operator induced by a linear relation is introduced, and
its relationships with other two important induced linear operators are
established. Several characterizations for closedness, closability, bundedness,
relative boundedness, and boundedness from below (above) of linear relations
are given in terms of their induced linear operators. In particular, the closed
graph theorem for linear relations in Banach spaces is completed, and stability
of closedness of linear relations under bounded and relatively bounded
perturbations is studied. The results obtained in the present paper generalize
the corresponding results for single-valued linear operators to multi-valued
linear operators, and some improve or relax certain assumptions of the related
existing results.


title:
Polycomp: efficient and configurable compression of astronomical
  timelines

abstract:
  This paper describes the implementation of polycomp, a open-sourced, publicly
available program for compressing one-dimensional data series in tabular
format. The program is particularly suited for compressing smooth, noiseless
streams of data like pointing information, as one of the algorithms it
implements applies a combination of least squares polynomial fitting and
discrete Chebyshev transforms that is able to achieve a compression ratio Cr up
to ~40 in the examples discussed in this work. This performance comes at the
expense of a loss of information, whose upper bound is configured by the user.
I show two areas in which the usage of polycomp is interesting. In the first
example, I compress the ephemeris table of an astronomical object (Ganymede),
obtaining Cr ~ 20, with a compression error on the x, y, z coordinates smaller
than 1 m. In the second example, I compress the publicly available timelines
recorded by the Low Frequency Instrument (LFI), an array of microwave
radiometers onboard the ESA Planck spacecraft. The compression reduces the
needed storage from ~6.5 TB to ~0.75 TB (C_r ~ 9), thus making them small
enough to be kept in a portable hard drive.


title:
The Power of Arc Consistency for CSPs Defined by Partially-Ordered
  Forbidden Patterns

abstract:
  Characterising tractable fragments of the constraint satisfaction problem
(CSP) is an important challenge in theoretical computer science and artificial
intelligence. Forbidding patterns (generic sub-instances) provides a means of
defining CSP fragments which are neither exclusively language-based nor
exclusively structure-based. It is known that the class of binary CSP instances
in which the broken-triangle pattern (BTP) does not occur, a class which
includes all tree-structured instances, are decided by arc consistency (AC), a
ubiquitous reduction operation in constraint solvers. We provide a
characterisation of simple partially-ordered forbidden patterns which have this
AC-solvability property. It turns out that BTP is just one of five such
AC-solvable patterns. The four other patterns allow us to exhibit new tractable
classes.


title: Can a Fast-mode EUV Wave Generate a Stationary Front?

abstract:
  The discovery of stationary "EIT waves" about 16 years ago posed a big
challenge to the then favorite fast-mode wave model for coronal "EIT waves". It
encouraged the proposing of various non-wave models, and played an important
role in approaching the recent converging viewpoint, {\it i.e.} there are two
types of EUV waves. However, it was recently discovered that a stationary wave
front can also be generated when a fast-mode wave passes through a magnetic
quasi-separatrix layer (QSL). In this paper, we perform a magnetohydrodynamic
(MHD) numerical simulation of the interaction between a fast-mode wave and a
magnetic QSL, and a stationary wave front is reproduced. The analysis of the
numerical results indicates that near the plasma beta $\sim 1$ layer in front
of the magnetic QSL, part of the fast-mode wave is converted to a slow-mode MHD
wave, which is then trapped inside the magnetic loops, forming a stationary
wave front. Our research implies that we have to be cautious in identifying the
nature of a wave since there may be mode conversion during the propagation of
the waves driven by solar eruptions.


title:
An implementation of hybrid parallel CUDA code for the hyperonic nuclear
  forces

abstract:
  We present our recent effort to develop a GPGPU program to calculate 52
channels of the Nambu-Bethe-Salpeter (NBS) wave functions in order to study the
baryon interactions, from nucleon-nucleon to $\Xi-\Xi$, from lattice QCD. We
adopt CUDA programming to perform the multi-GPU execution on a hybrid parallel
programming with MPI and OpenMP. Effective baryon block algorithm is briefly
outlined, which calculates efficaciously a large number of NBS wave functions
at a time, and three CUDA kernel programs are implemented to materialize the
effective baryon block algorithm using GPUs on the single-program multiple-data
(SPMD) programming model. In order to parallelize multiple GPUs, we take both
two approaches by dividing the time dimension and by dividing the spatial
dimensions. Performances are measured using HA-PACS supercomputer in University
of Tsukuba, which includes NVIDIA M2090 and NVIDIA K20X GPUs. Strong scaling
and weak scaling measured by using both M2090 and K20X GPUs are presented. We
find distinct difference between the M2090 and the K20X in the sustained
performance measurement of particular kernel executions which utilize the
cudaStream objects.


title:
Using Leaked Power to Measure Intrinsic AGN Power Spectra of Red-Noise
  Time Series

abstract:
  Fluxes emitted at different wavebands from active galactic nuclei (AGNs)
fluctuate at both long and short timescales. The variation can typically be
characterized by a broadband power spectrum, which exhibits a red-noise process
at high frequencies. The standard method of estimating power spectral density
(PSD) of AGN variability is easily affected by systematic biases such as
red-noise leakage and aliasing, in particular, when the observation spans a
relatively short period and is gapped. Focusing on the high-frequency PSD that
is strongly distorted due to red-noise leakage and usually not significantly
affected by aliasing, we develop a novel and observable normalized leakage
spectrum (NLS), which describes sensitively the effects of leaked red-noise
power on the PSD at different temporal frequencies. Using Monte Carlo
simulations, we demonstrate how an AGN underlying PSD sensitively determines
the NLS when there is severe red-noise leakage and thereby how the NLS can be
used to effectively constrain the underlying PSD.


title:
On the viability of the single wave model for the beam plasma
  instability

abstract:
  We analyze the interaction of a cold fast electron beam with a thermalized
plasma, in the presence of many Langmuir modes. The work aims at characterizing
the deviation of the system behavior from the single mode approximation, both
with respect to a consistent spectral analysis of the most unstable mode
harmonics and with respect to the presence of a dense spectrum, containing
linearly unstable and stable modes. We demonstrate how, on the one hand, the
total energy fraction absorbed by the harmonics is negligible at all (by
evaluating its total amount) and, on the other hand, the additional Langmuir
modes can be excited via an avalanche mechanism, responsible for a transport in
the particle velocity space. In particular, we show that the spectral
broadening outlines a universal shape and the distribution function, associated
to the avalanche mechanism, has an asymptotic plateau, differently from the
coherent structures characterizing the single wave model.


title: The set of distances in seminormal weakly Krull monoids

abstract:
  The set of distances of a monoid or of a domain is the set of all $d \in
\mathbb N$ with the following property: there are irreducible elements $u_1,
\ldots, u_k, v_1, \ldots, v_{k+d}$ such that $u_1 \cdot \ldots \cdot u_k = v_1
\cdot \ldots \cdot v_{k+d}$, but $u_1 \cdot \ldots \cdot u_k$ cannot be written
as a product of $l$ irreducible elements for any $l$ with $k < l < k+d$. We
show that the set of distances is an interval for certain seminormal weakly
Krull monoids which include seminormal orders in holomorphy rings of global
fields.


title:
Comments on the symmetry of AdS$_6$ solutions in String/M-theory and
  Killing spinor equations

abstract:
  It was recently pointed out in \cite{Kim:2015hya} that AdS$_6$ solutions in
IIB theory enjoy an extended symmetry structure and the consistent truncation
to $D=4$ internal space leads to a nonlinear sigma model with target
$SL(3,\mathbb{R})/SO(2,1)$. We continue to study the purely bosonic $D=4$
effective action, and elucidate how the addition of scalar potential term still
allows Killing spinor equations in the absence of gauge fields. In particular,
the potential turns out to be a single diagonal component of the coset
representative. Furthermore, we perform a general analysis of the integrability
conditions of Killing spinor equations and establish that the effective action
can be in fact generalized to arbitrary sizes and signatures, e.g. with target
$SL(n,\mathbb{R})/SO(p,n-p)$ and the scalar potential expressible by a single
diagonal component of the coset representative. We also comment on a similar
construction and its generalizations of effective $D=5$ purely bosonic
non-linear sigma model action related to AdS$_6$ in M-theory.


title:
Linear Irreversible Thermodynamics and Onsager Reciprocity for
  Information-driven Engines

abstract:
  In the recent progress in nonequilibrium thermodynamics, information has been
recognized as a kind of thermodynamic resource that can drive thermodynamic
current without any direct energy injection. In this paper, we establish the
framework of linear irreversible thermodynamics for a broad class of autonomous
information processing. In particular, we prove that the Onsager reciprocity
holds true with information: The linear response matrix is well-defined, and is
shown symmetric with both of the information affinity and the conventional
thermodynamic affinity. As an application, we derive a universal bound for the
efficiency at maximum power for information-driven engines in the linear
regime. Our result reveals the fundamental role of information flow in linear
irreversible thermodynamics, and would be applicable to study the role of
information in biological systems.


title:
Magnetar-Powered Supernovae in Two Dimensions. I. Superluminous
  Supernovae

abstract:
  Previous studies have shown that the radiation emitted by a rapidly rotating
magnetar embedded in a young supernova can greatly amplify its luminosity.
These one-dimensional studies have also revealed the existence of an
instability arising from the piling up of radiatively accelerated matter in a
thin dense shell deep inside the supernova. Here we examine the problem in two
dimensions and find that, while instabilities cause mixing and fracture this
shell into filamentary structures that reduce the density contrast, the
concentration of matter in a hollow shell persists. The extent of the mixing
depends upon the relative energy input by the magnetar and the kinetic energy
of the inner ejecta. The light curve and spectrum of the resulting supernova
will be appreciably altered, as will the appearance of the supernova remnant,
which will be shellular and filamentary. A similar pile up and mixing might
characterize other events where energy is input over an extended period by a
centrally concentrated source, e.g. a pulsar, radioactive decay, a
neutrino-powered wind, or colliding shells. The relevance of our models to the
recent luminous transient ASASSN-15lh is briefly discussed.


title: Probabilistic Graphical Models on Multi-Core CPUs using Java 8

abstract:
  In this paper, we discuss software design issues related to the development
of parallel computational intelligence algorithms on multi-core CPUs, using the
new Java 8 functional programming features. In particular, we focus on
probabilistic graphical models (PGMs) and present the parallelisation of a
collection of algorithms that deal with inference and learning of PGMs from
data. Namely, maximum likelihood estimation, importance sampling, and greedy
search for solving combinatorial optimisation problems. Through these concrete
examples, we tackle the problem of defining efficient data structures for PGMs
and parallel processing of same-size batches of data sets using Java 8
features. We also provide straightforward techniques to code parallel
algorithms that seamlessly exploit multi-core processors. The experimental
analysis, carried out using our open source AMIDST (Analysis of MassIve Data
STreams) Java toolbox, shows the merits of the proposed solutions.


title: Global Coronal Waves

abstract:
  After the {\em Solar and Heliospheric Observatory} ({\em SOHO}) was launched
in 1996, the aboard Extreme Ultraviolet Imaging Telescope (EIT) observed a
global coronal wave phenomenon, which was initially named "EIT wave" after the
telescope. The bright fronts are immediately followed by expanding dimmings. It
has been shown that the brightenings and dimmings are mainly due to plasma
density increase and depletion, respectively. Such a spectacular phenomenon
sparked long-lasting interest and debates. The debates were concentrated on two
topics, one is about the driving source, and the other is about the nature of
this wavelike phenomenon. The controversies are most probably because there may
exist two types of large-scale coronal waves that were not well resolved before
the {\em Solar Dynamics Observatory} ({\em SDO}) was launched: one is a
piston-driven shock wave straddling over the erupting coronal mass ejection
(CME), and the other is an apparently propagating front, which may correspond
to the CME frontal loop. Such a two-wave paradigm was proposed more than 13
years ago, and now is being recognized by more and more colleagues. In this
paper, we review how various controversies can be resolved in the two-wave
framework and how important it is to have two different names for the two types
of coronal waves.


title:
Very low critical current density for motion of coupled domain walls in
  synthetic ferrimagnet nanowires

abstract:
  Domain walls in ferromagnetic nanowires are potential building-blocks of
future technologies such as racetrack memories, in which data encoded in the
domain walls are transported using spin-polarised currents. However, the
development of energy-efficient devices has been hampered by the high current
densities needed to initiate domain wall motion. We show here that a remarkable
reduction in the critical current density can be achieved for in-plane
magnetised coupled domain walls in CoFe/Ru/CoFe synthetic ferrimagnet tracks.
The antiferromagnetic exchange coupling between the layers leads to simple
N\'{e}el wall structures, imaged using photoemission electron and Lorentz
transmission electron microscopy, with a width of only $\sim 100$~nm. The
measured critical current density to set these walls in motion, detected using
magnetotransport measurements, is $1.0 \times 10^{11}$~Am$^{-2}$, almost an
order of magnitude lower than in a ferromagnetically coupled control sample.
Theoretical modelling indicates that this is due to nonadiabatic driving of
anisotropically coupled walls, a mechanism that can be used to design efficient
domain-wall devices.


title:
How the nature of web services drives vocabulary creation in social
  tagging

abstract:
  A social tagging system allows users to add arbitrary strings, called "tags",
on a shared resource to organize and manage information. The Yule--Simon
process, which has shown the ability to capture the population dynamics of
social tagging behavior, does not handle the mechanism of new vocabulary
creation because it assumes that new vocabulary creation is a Poisson-like
random process. In this research, we focus on the mechanism of vocabulary
creation from the microscopic perspective and discuss whether it also follows
the random process assumed in the Yule--Simon process. To capture the
microscopic mechanism of vocabulary creation, we focus on the relationship
between the number of tags used in the same entry and the local vocabulary
creation rate. We find that the relationship is not the result of a simple
random process, and differs between services. Furthermore, these differences
depend on whether the user's tagging attitudes are private or open. These
results provide the potential for a new index to identify the service's
intrinsic nature.


title:
Highly sparse surface couplings for subdomain-wise isoviscous Stokes
  finite element discretizations

abstract:
  The Stokes system with constant viscosity can be cast into different
formulations by exploiting the incompressibility constraint. For instance the
strain in the weak formulation can be replaced by the gradient to decouple the
velocity components in the different coordinate directions. Thus the
discretization of the simplified problem leads to fewer nonzero entries in the
stiffness matrix. This is of particular interest in large scale simulations
where a reduced memory bandwidth requirement can help to significantly
accelerate the computations. In the case of a piecewise constant viscosity, as
it typically arises in multi-phase flows, or when the boundary conditions
involve traction, the situation is more complex, and one has to treat the cross
derivatives in the original Stokes system with care. A naive application of the
standard vectorial Laplacian results in a physically incorrect solution, while
formulations based on the strain increase the computational effort everywhere,
even when the inconsistencies arise only from an incorrect treatment in a small
fraction of the computational domain. Here we propose a new approach that is
consistent with the strain-based formulation and preserves the decoupling
advantages of the gradient-based formulation in isoviscous subdomains. The
modification is equivalent to locally changing the discretization stencils,
hence the more expensive discretization is restricted to a lower dimensional
interface, making the additional computational cost asymptotically negligible.
We demonstrate the consistency and convergence properties of the method and
show that in a massively parallel setup, the multigrid solution of the
resulting discrete systems is faster than for the classical strain-based
formulation. Moreover, we give an application example which is inspired by
geophysical research.