title: Simulation Model Of Functional Stability Of Business Processes

abstract:
  Functioning of business processes of high-tech enterprise is in a constant
interaction with the environment. Herewith a wide range of such interaction
represents a variety of conflicts affecting the achievement of the goals of
business processes. All these things lead to the disruption of functioning of
business processes. That's why modern enterprises should have mechanisms to
provide a new property of business processes - ability to maintain and/or
restore functions in various adverse effects. This property is called
functional stability of business processes (FSBP). In this article we offer,
showcase and test the new approach to assessing the results of business process
re-engineering by simulating their functional stability before and after
re-engineering.


title:
A mean-field monomer-dimer model with attractive interaction. The exact
  solution

abstract:
  A mean-field monomer-dimer model which includes an attractive interaction
among both monomers and dimers is introduced and its exact solution rigorously
derived. The Heilmann-Lieb method for the pure hard-core interacting case is
used to compute upper and lower bounds for the pressure. The bounds are shown
to coincide in the thermodynamic limit for a suitable choice of the monomer
density m. The consistency equation characterising m is studied in the phase
space (h, J), where h tunes the monomer potential and J the attractive
potential. The critical point and exponents are computed and show that the
model is in the mean-field ferromagnetic universality class.


title:
$B\to\pi\ell\nu$ and $B\to\pi\ell^+\ell^-$ semileptonic form factors
  from unquenched lattice QCD

abstract:
  We update the lattice calculation of the $B\to\pi$ semileptonic form factors,
which have important applications to the CKM matrix element $|V_{ub}|$ and the
$B\to\pi\ell^+\ell^-$ rare decay. We use MILC asqtad ensembles with $N_f=2+1$
sea quarks and over a range of lattice spacings $a \approx 0.045$--$0.12$ fm.
We perform a combined chiral and continuum extrapolation of our lattice data
using SU(2) staggered chiral perturbation theory in the hard pion limit. To
extend the results for the form factors to the full kinematic range, we take a
functional approach to parameterize the form factors using the
Bourrely-Caprini-Lellouch formalism in a model-independent way. Our analysis is
still blinded with an unknown off-set factor which will be disclosed when we
present the final results.


title:
Sejong Open Cluster Survey (SOS). II. IC 1848 Cluster in the H II Region
  W5 West

abstract:
  IC 1848 is one of the young open clusters in the giant star forming Cas OB6
association. Several interesting aspects relating to star formation processes
in giant star forming regions attracted us to study the initial mass function
(IMF), star formation mode, and properties of pre-main sequence stars (PMS). A
UBVI and H alpha photometric study of the young open cluster IC 1848 was
conducted as part of the "Sejong Open cluster Survey" (SOS). We have selected
105 early-type members from photometric diagrams. Their mean reddening is
<E(B-V)> = 0.660 +/- 0.054 mag. Using the published photometric data with near-
and mid-infrared archival data we confirmed the normal reddening law (R_V =
3.1) toward the cluster (IC 1848). A careful zero-age main sequence fitting
gives a distance modulus of V_0 - M_V = 11.7 +/- 0.2 mag, equivalent to 2.2 +/-
0.2 kpc. H alpha photometry and the list of young stellar objects identified by
Koenig et al. permitted us to select a large number of PMS stars comprising 196
H alpha emission stars, 35 H alpha emission candidates, 5 Class I, 368 Class
II, and 24 transition disk candidates. From the Hertzsprung-Russell diagram
using stellar evolution models, we estimate an age of 5 Myr from several
evolved stars and 3 Myr from the PMS stars. The IMF was derived from stars with
mass larger than 3 M_sun, and the slope is slightly steeper (Gamma = -1.6 +/-
0.2) than the Salpeter/Kroupa IMF. Finally, we estimated the mass accretion
rate of PMS stars with a UV excess. The mean mass accretion rate is about 1.4 x
10^-8 M_sun yr^-1 in the mass range of 0.5 M_sun to 2 M_sun, whereas
intermediate-mass stars (>= 2.5 M_sun) exhibit a much higher accretion rate of
dM/dt > 10^-6 M_sun yr^-1.


title: Natural orbital networks

abstract:
  Given a finite set T of maps on a finite ring R, we look at the finite simple
graph G=(V,E) with vertex set V=R and edge set E={(a,b) | exists t in T,
b=t(a), b not equal to a}. An example is when R=Z_n and T consists of a finite
set of quadratic maps T_i(x)=x^2+a_i. Graphs defined like that have a
surprisingly rich structure. This holds especially in an algebraic set-up when
T is generated by polynomials on Z_n. The characteristic path length L and the
mean clustering coefficient C are interlinked by global-local quantity
LC=-L/log(C) which often appears to have a limit for n to infinity like for two
quadratic maps on a finite field Z_p. We see that for one quadratic map x^2+a,
the probability to have connectedness goes to zero and for two quadratic maps,
the probability goes to 1, for three different quadratic maps x^2+a,x^2+b,x^2+c
on Z_p, we always appear to get a connected graph for all primes.


title: Lower bounds for the isoperimetric numbers of random regular graphs

abstract:
  The vertex isoperimetric number of a graph $G=(V,E)$ is the minimum of the
ratio $|\partial_{V}U|/|U|$ where $U$ ranges over all nonempty subsets of $V$
with $|U|/|V|\le u$ and $\partial_{V}U$ is the set of all vertices adjacent to
$U$ but not in $U$. The analogously defined edge isoperimetric number---with
$\partial_{V}U$ replaced by $\partial_{E}U$, the set of all edges with exactly
one endpoint in $U$---has been studied extensively. Here we study random
regular graphs. For the case $u=1/2$, we give asymptotically almost sure lower
bounds for the vertex isoperimetric number for all $d\ge3$. Moreover, we obtain
a lower bound on the asymptotics as $d\to\infty$. We also provide
asymptotically almost sure lower bounds on $|\partial_{E}U|/|U|$ in terms of an
upper bound on the size of $U$ and analyse the bounds as $d\to\infty$.


title: Double Ramp Loss Based Reject Option Classifier

abstract:
  We consider the problem of learning reject option classifiers. The goodness
of a reject option classifier is quantified using $0-d-1$ loss function wherein
a loss $d \in (0,.5)$ is assigned for rejection. In this paper, we propose {\em
double ramp loss} function which gives a continuous upper bound for $(0-d-1)$
loss. Our approach is based on minimizing regularized risk under the double
ramp loss using {\em difference of convex (DC) programming}. We show the
effectiveness of our approach through experiments on synthetic and benchmark
datasets. Our approach performs better than the state of the art reject option
classification approaches.


title:
Control over band structure and tunneling in Bilayer Graphene induced by
  velocity engineering

abstract:
  The band structure and transport properties of massive Dirac Fermions in
bilayer graphene with velocity modulation in space are investigated in presence
of the previously created band gap. It is pointed out that the velocity
engineering is considered as a factor to control the band gap of
symmetry-broken bilayer graphene. The band gap is direct and independent of
velocity value if velocity modulated in two layers is set up equally.
Otherwise, in the case of interlayer asymmetric velocity, not only the band gap
is indirect, but also the electron-hole symmetry fails. This band gap is
controllable by the ratio of the velocity modulated in the upper layer to the
velocity modulated in the lower layer. In more detail, the shift of momentum
from the conduction band edge to the valence band edge can be engineered by the
gate bias and velocity ratio. A transfer matrix method is also elaborated to
calculate four-band coherent conductance through a velocity barrier possibly
subjected to a gate bias. Electronic transport depends on the ratio of velocity
modulated inside the barrier to the one for surrounding regions. As a result, a
quantum version of total internal reflection is observed for enough thick
velocity barriers. Moreover, a transport gap originating from the applied gate
bias is engineered by modulating velocity of the carriers in the upper and
lower layers.


title:
Diffuse interface models of locally inextensible vesicles in a viscous
  fluid

abstract:
  We present a new diffuse interface model for the dynamics of inextensible
vesicles in a viscous fluid. A new feature of this work is the implementation
of the local inextensibility condition in the diffuse interface context. Local
inextensibility is enforced by using a local Lagrange multiplier, which
provides the necessary tension force at the interface. To solve for the local
Lagrange multiplier, we introduce a new equation whose solution essentially
provides a harmonic extension of the local Lagrange multiplier off the
interface while maintaining the local inextensibility constraint near the
interface. To make the method more robust, we develop a local relaxation scheme
that dynamically corrects local stretching/compression errors thereby
preventing their accumulation. Asymptotic analysis is presented that shows that
our new system converges to a relaxed version of the inextensible sharp
interface model. This is also verified numerically. Although the model does not
depend on dimension, we present numerical simulations only in 2D. To solve the
2D equations numerically, we develop an efficient algorithm combining an
operator splitting approach with adaptive finite elements where the
Navier-Stokes equations are implicitly coupled to the diffuse interface
inextensibility equation. Numerical simulations of a single vesicle in a shear
flow at different Reynolds numbers demonstrate that errors in enforcing local
inextensibility may accumulate and lead to large differences in the dynamics in
the tumbling regime and differences in the inclination angle of vesicles in the
tank-treading regime. The local relaxation algorithm is shown to effectively
prevent this accumulation by driving the system back to its equilibrium state
when errors in local inextensibility arise.

categories: math-ph cond-mat.soft math.MP physics.flu-dyn


title: A Detailed Analysis of the HD 73526 2:1 Resonant Planetary System

abstract:
  We present six years of new radial-velocity data from the Anglo-Australian
and Magellan Telescopes on the HD 73526 2:1 resonant planetary system. We
investigate both Keplerian and dynamical (interacting) fits to these data,
yielding four possible configurations for the system. The new data now show
that both resonance angles are librating, with amplitudes of 40 degrees and 60
degrees, respectively. We then perform long-term dynamical stability tests to
differentiate these solutions, which only differ significantly in the masses of
the planets. We show that while there is no clearly preferred system
inclination, the dynamical fit with i=90 degrees provides the best combination
of goodness-of-fit and long-term dynamical stability.


title: On reduced zero-divisor graphs of posets

abstract:
  In this paper we study some of the basic properties of a graph which is
constructed from the equivalence classes of non-zero zero-divisors determined
by annihilator ideals of a poset. In particular, we demonstrate how this graph
helps in identifying the annihilator prime ideals of a poset that satisfies the
ascending chain condition for its proper annihilator ideals.


title: Entropy of Symmetric Graphs

abstract:
  A graph $G$ is called \emph{symmetric with respect to a functional $F_G(P)$}
defined on the set of all the probability distributions on its vertex set if
the distribution $P^*$ maximizing $F_G(P)$ is uniform on $V(G)$. Using the
combinatorial definition of the entropy of a graph in terms of its vertex
packing polytope and the relationship between the graph entropy and fractional
chromatic number, we prove that vertex transitive graphs are symmetric with
respect to graph entropy. As the main result of this paper, we prove that a
perfect graph is symmetric with respect to graph entropy if and only if its
vertices can be covered by disjoint copies of its maximum-size clique.
Particularly, this means that a bipartite graph is symmetric with respect to
graph entropy if and only if it has a perfect matching.


abstract:
  We consider four-dimensional UV descriptions of composite Higgs models
without elementary scalars, in which four-fermion interactions are introduced
to an underlying gauge theory like in the gauged NJL model. When the anomalous
dimension of the fermion bilinear is large, these interactions drive the
spontaneous global symmetry breaking in the model, with the Higgs identified as
a Nambu-Goldstone boson. The UV descriptions support composite top partner
operators, also with large anomalous dimensions, thereby providing an explicit
realisation of the idea of partial compositeness. In particular, the composite
SO(6)/SO(5) model can be described by an Sp gauge theory with four flavours of
fermion, together with a vector-like pair of fermions transforming in the
antisymmetric representation and charged under SU(3) colour. These fermions
confine to produce both the Higgs and top partner bound states. Our methods can
also be applied to different coset groups, suggesting that four-fermion
operators can describe the underlying UV dynamics of other composite Higgs
models.


title:
Higher-order semantics for quantum programming languages with classical
  control

abstract:
  This thesis studies the categorical formalisation of quantum computing,
through the prism of type theory, in a three-tier process. The first stage of
our investigation involves the creation of the dagger lambda calculus, a lambda
calculus for dagger compact categories. Our second contribution lifts the
expressive power of the dagger lambda calculus, to that of a quantum
programming language, by adding classical control in the form of complementary
classical structures and dualisers. Finally, our third contribution
demonstrates how our lambda calculus can be applied to various well known
problems in quantum computation.


title:
Large Gaseous Detector of Ionizing Eradiation in Search for Coherent
  Neutrino-Nucleus Scattering

abstract:
  We propose to search for coherent neutrino-nucleus scattering (CNNS)by means
of a triple-sectioned low background proportional counter. As a working medium
we plan to use argon and xenon at about 1 MPa. We have shown using bench-scale
assembly, that pulse-shape discrimination enables to effectively suppress noise
pulses from electromagnetic disturbances and microphonic effect in the energy
region where one expects signal from CNNS (from 20 eV to 100 eV) with a factor
of about $10^3$. The calculation has been done of the background from neutrons,
generated by muons of cosmic rays. The experimental setup has been proposed.


title: Acoustic Methods for Evaluation of High Energy Explosions

abstract:
  Two independent acoustic methods were used to verify the results of earlier
explosion energy calculations of Chelyabinsk meteoroid. They are: estimations
through a path length of infrasound wave and through maximum concentration of
the wave energy. The energy of this explosion turned out the same as in earlier
calculations, and it is close to 57 Mt of TNT. The first method, as well as
evaluations through seismic signals and barograms, have confirmed the energy of
Tunguska meteoroid explosion at 14.0 - 14.5 Mt level. Moreover, there is a good
agreement between acoustic estimations and other data for the explosion energy
of another meteoroid that was ended its flight over the southern part of Indian
Ocean, and for two catastrophic volcanoes explosions - Bezymyanny and Krakatoa.


title:
A Randomized Generic Lucas Seed Algorithm (RGLSA) with Tail Boosting for
  Threat Modeling in Virtual Machines

abstract:
  The paper is about a self-propagating and self-replicating model of malicious
seeds.


title:
Generalized robust shrinkage estimator and its application to STAP
  detection problem

abstract:
  Recently, in the context of covariance matrix estimation, in order to improve
as well as to regularize the performance of the Tyler's estimator [1] also
called the Fixed-Point Estimator (FPE) [2], a "shrinkage" fixed-point estimator
has been introduced in [3]. First, this work extends the results of [3,4] by
giving the general solution of the "shrinkage" fixed-point algorithm. Secondly,
by analyzing this solution, called the generalized robust shrinkage estimator,
we prove that this solution converges to a unique solution when the shrinkage
parameter $\beta$ (losing factor) tends to 0. This solution is exactly the FPE
with the trace of its inverse equal to the dimension of the problem. This
general result allows one to give another interpretation of the FPE and more
generally, on the Maximum Likelihood approach for covariance matrix estimation
when constraints are added. Then, some simulations illustrate our theoretical
results as well as the way to choose an optimal shrinkage factor. Finally, this
work is applied to a Space-Time Adaptive Processing (STAP) detection problem on
real STAP data.


title: Depth $0$ Nonsingular Morse Smale flows on $S^3$

abstract:
  In this paper, we first develope the concept of Lyapunov graph to weighted
Lyapunov graph (abbreviated as WLG) for nonsingular Morse-Smale flows
(abbreviated as NMS flows) on $S^3$. WLG is quite sensitive to NMS flows on
$S^3$. For instance, WLG detect the indexed links of NMS flows. Then we use WLG
and some other tools to describe nonsingular Morse-Smale flows without
heteroclinic trajectories connecting saddle orbits (abbreviated as depth $0$
NMS flows). It mainly contains the following several directions:
\begin{enumerate}
  \item we use WLG to list depth $0$ NMS flows on $S^3$;
  \item with the help of WLG, comparing with Wada's algorithm, we provide a
direct description about the (indexed) link of depth $0$ NMS flows;
  \item to overcome the weakness that WLG can't decide topologically equivalent
class, we give a simplified Umanskii Theorem to decide when two depth $0$ NMS
flows on $S^3$ are topological equivalence;
  \item under these theories, we classify (up to topological equivalence) all
depth 0 NMS flows on $S^3$ with periodic orbits number no more than 4.
\end{enumerate}


title: Regularity of the obstacle problem for the parabolic biharmonic equation

abstract:
  We study the regularity of solutions to the obstacle problem for the
parabolic biharmonic equation. We analyze the problem via an implicit time
discretization, and we prove some regularity properties of the solution.


title: XQuery Streaming by Forest Transducers

abstract:
  Streaming of XML transformations is a challenging task and only very few
systems support streaming. Research approaches generally define custom
fragments of XQuery and XPath that are amenable to streaming, and then design
custom algorithms for each fragment. These languages have several shortcomings.
Here we take a more principles approach to the problem of streaming
XQuery-based transformations. We start with an elegant transducer model for
which many static analysis problems are well-understood: the Macro Forest
Transducer (MFT). We show that a large fragment of XQuery can be translated
into MFTs --- indeed, a fragment of XQuery, that can express important features
that are missing from other XQuery stream engines, such as GCX: our fragment of
XQuery supports XPath predicates and let-statements. We then rely on a
streaming execution engine for MFTs, one which uses a well-founded set of
optimizations from functional programming, such as strictness analysis and
deforestation. Our prototype achieves time and memory efficiency comparable to
the fastest known engine for XQuery streaming, GCX. This is surprising because
our engine relies on the OCaml built in garbage collector and does not use any
specialized buffer management, while GCX's efficiency is due to clever and
explicit buffer management.


title:
An Algebraic Method for the Analytical Solutions of the Klein-Gordon
  equation for any angular momentum for some diatomic potentials

abstract:
  Analytical solutions of the Klein-Gordon equation are obtained by reducing
the radial part of the wave equation to a standard form of a second order
differential equation. Differential equations of this standard form are
solvable in terms of hypergeometric functions and we give an algebraic
formulation for the bound state wave functions and for the energy eigenvalues.
This formulation is applied for the solutions of the Klein-Gordon equation with
some diatomic potentials.


title:
Visualizing influence of point defects on electronic band structure of
  graphene

abstract:
  The supercell approach enables us to treat the electronic structure of
defective crystals, but the calculated energy bands are too complicated to
understand or to compare with angle-resolved photoemission spectra because of
inevitable zone folding. We discuss how to visualize supercell band structures
more effectively by incorporating in them unfolded spectral weights and orbital
decompositions. We then apply these ideas to gain a better understanding of the
band structure of graphene containing various types of points defects,
including nitrogen impurity, hydrogen adsorbate, and vacancy defect, and also
the Stone-Wales defect.


title:
Global existence and decay estimates for quasilinear wave equations with
  nonuniform dissipative term

abstract:
  We study global existence and decay estimates for quasilinear wave equations
with dissipative terms in the Sobolev space $H^L \times H^{L-1}$, where $L \geq
[d/2]+3$. The linear dissipative terms depend on space variable coefficient,
and these terms may vanish in some compact region. For the proof of global
existence, we need estimates of higher order energies. To control derivatives
of the dissipative coefficient, we introduce an argument using the rescaling.
Furthermore we get the decay estimates with additional assumptions on the
initial data. To obtain the decay estimates, the rescaling argument is also
needed.


title: How river rocks round: resolving the shape-size paradox

abstract:
  River-bed sediments display two universal downstream trends: fining, in which
particle size decreases; and rounding, where pebble shapes evolve toward
ellipsoids. Rounding is known to result from transport-induced abrasion;
however many researchers argue that the contribution of abrasion to downstream
fining is negligible. This presents a paradox: downstream shape change
indicates substantial abrasion, while size change apparently rules it out. Here
we use laboratory experiments and numerical modeling to show quantitatively
that pebble abrasion is a curvature-driven flow problem. As a consequence,
abrasion occurs in two well-separated phases: first, pebble edges rapidly round
without any change in axis dimensions until the shape becomes entirely convex;
and second, axis dimensions are then slowly reduced while the particle remains
convex. Explicit study of pebble shape evolution helps resolve the shape-size
paradox by reconciling discrepancies between laboratory and field studies, and
enhances our ability to decipher the transport history of a river rock.


title: Charge renormalisation in a mean-field approximation of QED

abstract:
  We study the Bogoliubov-Dirac-Fock (BDF) model, a no-photon, mean-field
approxi- mation of quantum electrodynamics that allows to study relativistic
electrons interacting with the vacuum. It is a variational model in which
states are represented by Hilbert- Schmidt operators. We prove a charge
renormalisation formula that holds close to the non-relativistic limit: the
density of a ground state is shown to be integrable although such a state is
known not to be trace-class. We prove that we can take the non-relativistic
limit by keeping track of the vacuum polarisation. We get an altered
Hartree-Fock model due to the screening effect.


title:
Comment on "Self-Averaging Stochastic Kohn-Sham Density-Functional
  Theory"

abstract:
  In a recent Letter, Baer et al. present a stochastic method for Kohn-Sham
density functional theory calculations. Their convergence criterion is the
self-averaging total energy per electron, which requires a number of
statistical samples that decreases with system size and enables a
sublinear-scaling computational cost. However, the electron density, atomic
forces, orbital energies, and many other physical quantities do not
self-average, and this procedure causes their statistical errors to grow with
system size. Convergence of non-self-averaging quantities requires that the
number of samples be maintained with system size and is incompatible with a
sublinear-scaling cost.


title:
Topological invariant tensor renormalization group method for spin
  glasses

abstract:
  Tensor renormalization group method (TRG) is a real space renormalization
group approach. It has been successfully applied to both classical and quantum
systems. In this paper, we study a disordered and frustrated system, the
two-dimensional Edward-Anderson model, by a new topological invariant TRG
scheme. We propose an approach to calculate the local magnetizations and
nearest pair correlations simultaneously. The Nishimori multi-critical point
predicted by the topological invariant TRG agrees well with the recent
Monte-Carlo results. The TRG schemes outperform the mean field methods on the
calculation of the partition function. We notice that it maybe obtain a
negative partition function at sufficiently low temperatures. However, the
negative contribution can be neglected if the systems is large enough. This
topological invariant TRG can also be used to study three-dimensional spin
glass systems.


title:
Reverse Proxy Framework using Sanitization Technique for Intrusion
  Prevention in Database

abstract:
  With the increasing importance of the internet in our day to day life, data
security in web application has become very crucial. Ever increasing on line
and real time transaction services have led to manifold rise in the problems
associated with the database security. Attacker uses illegal and unauthorized
approaches to hijack the confidential information like username, password and
other vital details. Hence the real time transaction requires security against
web based attacks. SQL injection and cross site scripting attack are the most
common application layer attack. The SQL injection attacker pass SQL statement
through a web applications input fields, URL or hidden parameters and get
access to the database or update it. The attacker take a benefit from user
provided data in such a way that the users input is handled as a SQL code.
Using this vulnerability an attacker can execute SQL commands directly on the
database. SQL injection attacks are most serious threats which take users input
and integrate it into SQL query. Reverse Proxy is a technique which is used to
sanitize the users inputs that may transform into a database attack. In this
technique a data redirector program redirects the users input to the proxy
server before it is sent to the application server. At the proxy server, data
cleaning algorithm is triggered using a sanitizing application. In this
framework we include detection and sanitization of the tainted information
being sent to the database and innovate a new prototype.


title:
Excited light and strange hadrons from the lattice with two Chirally
  Improved quarks

abstract:
  Results for excited light and strange hadrons from the lattice with two
flavors of Chirally Improved sea quarks are presented. We perform simulations
at several values of the pion mass ranging from 250 to 600 MeV and extrapolate
to the physical pion mass. The variational method is applied to extract excited
energy levels but also to discuss the content of the states. Among others, we
explore the flavor singlet/octet content of Lambda states. In general, our
results agree well with experiment, in particular we confirm the Lambda(1405)
and its dominant flavor singlet structure.


title:
Strongly elliptic pseudodifferential equations on the sphere with radial
  basis functions

abstract:
  Spherical radial basis functions are used to define approximate solutions to
strongly elliptic pseudodifferential equations on the unit sphere. These
equations arise from geodesy. The approximate solutions are found by the
Galerkin and collocation methods. A salient feature of the paper is a {\em
unified theory} for error analysis of both approximation methods.


title:
Implementation of the finite amplitude method for the relativistic
  quasiparticle random-phase approximation

abstract:
  A new implementation of the finite amplitude method (FAM) for the solution of
the relativistic quasiparticle random-phase approximation (RQRPA) is presented,
based on the relativistic Hartree-Bogoliubov (RHB) model for deformed nuclei.
The numerical accuracy and stability of the FAM -- RQRPA is tested in a
calculation of the monopole response of $^{22}$O. As an illustrative example,
the model is applied to a study of the evolution of monopole strength in the
chain of Sm isotopes, including the splitting of the giant monopole resonance
in axially deformed systems.


title:
Cooperative Lifting of Spin Blockade in a Three-Terminal Triple Quantum
  Dot

abstract:
  We report measurements of multi-path transport through a triple quantum dot
(TQD) in the few-electron regime using a GaAs three-terminal device with a
separate lead attached to each dot. When two paths reside inside the transport
window and are simultaneously spin-blockaded, the leak currents through both
paths are significantly enhanced. We suggest that the transport processes in
the two paths cooperate to lift the spin blockade. Fine structures in transport
spectra indicate that different kinds of cooperative mechanisms are involved,
depending on the details of the three-electron spin states governed by the size
of exchange splitting relative to nuclear spin fluctuations. Our results
indicate that a variety of correlation phenomena can be explored in
three-terminal TQDs.


title:
Permutation-like Matrix Groups with a Maximal Cycle of Prime Square
  Length

abstract:
  A matrix group is said to be permutation-like if any matrix of the group is
similar to a permutation matrix. G. Cigler proved that, if a permutation-like
matrix group contains a normal cyclic subgroup which is generated by a maximal
cycle and the matrix dimension is a prime, then the group is similar to a
permutation matrix group. This paper extends the result to the case where the
matrix dimension is a square of a prime.


title: The (B) conjecture for uniform measures in the plane

abstract:
  We prove that for any two centrally-symmetric convex shapes $K,L \subset
\mathbb{R}^2$, the function $t \mapsto |e^t K \cap L|$ is log-concave. This
extends a result of Cordero-Erausquin, Fradelizi and Maurey in the two
dimensional case. Possible relaxations of the condition of symmetry are
discussed.


title:
Reliability measures for indexed semi-Markov chains applied to wind
  energy production

abstract:
  The computation of the dependability measures is a crucial point in the
planning and development of a wind farm. In this paper we address the issue of
energy production by wind turbine by using an indexed semi-Markov chain as a
model of wind speed. We present the mathematical model, we describe the data
and technical characteristics of a commercial wind turbine (Aircon HAWT-10kW).
We show how to compute some of the main dependability measures such as
reliability, availability and maintainability functions. We compare the results
of the model with real energy production obtained from data available in the
Lastem station (Italy) and sampled every 10 minutes.


title:
Quantum Metrology via Repeated Quantum Nondemolition Measurements in
  "Photon Box"

abstract:
  In quantum metrology schemes, one generally needs to prepare $m$ copies of
$N$ entangled particles, such as entangled photon states, and then they are
detected in a destructive process to estimate an unknown parameter. Here, we
present a novel experimental scheme for estimating this parameter by using
repeated indirect quantum nondemolition measurements in the setup called
"photon box". This interaction-based scheme is able to achieve the phase
sensitivity scaling as $1/N$ with a Fock state of $N$ photons. Moreover, we
only need to prepare one initial $N$-photon state and it can be used
repetitively for $m$ trials of measurements. This new scheme is shown to
sustain the quantum advantage for a much longer time than the damping time of
Fock state and be more robust than the common strategy with exotic entangled
states. To overcome the $2\pi/N$ periodic error in the estimation of the true
parameter, we can employ a cascaded strategy by adding a real-time feedback
interferometric layout.


title: Spin noise spectroscopy of a single-quantum-well microcavity

abstract:
  We report on the first experimental observation of spin noise in a single
semiconductor quantum well embedded into a microcavity. The great
cavity-enhanced sensitivity to fluctuations of optical anisotropy has allowed
us to measure the Kerr rotation and ellipticity noise spectra in the strong
coupling regime. The spin noise spectra clearly show two resonant features: a
conventional magneto-resonant component shifting towards higher frequencies
with magnetic field and an unusual "nonmagnetic" component centered at zero
frequency and getting suppressed with increasing magnetic field. We attribute
the first of them to the Larmor precession of free electron spins, while the
second one being presumably due to hyperfine electron-nuclei spin interactions.


title: A Bertini-type theorem for free arithmetic linear series

abstract:
  In this paper, we prove a version of the arithmetic Bertini theorem asserting
that there exists a strictly small and generically smooth section of a given
arithmetically free graded arithmetic linear series.


title: Symmetry breaking in a mechanical resonator made from a carbon nanotube

abstract:
  Nanotubes behave as semi-flexible polymers in that they can bend by a
sizeable amount. When integrating a nanotube in a mechanical resonator, the
bending is expected to break the symmetry of the restoring potential. Here we
report on a new detection method that allows us to demonstrate such symmetry
breaking. The method probes the motion of the nanotube resonator at nearly
zero-frequency; this motion is the low-frequency counterpart of the second
overtone of resonantly excited vibrations. We find that symmetry breaking leads
to the spectral broadening of mechanical resonances, and to an apparent quality
factor that drops below 100 at room temperature. The low quality factor at room
temperature is a striking feature of nanotube resonators whose origin has
remained elusive for many years. Our results shed light on the role played by
symmetry breaking in the mechanics of nanotube resonators.


title:
Origin of Nonthermal Emission from the Fermi Bubbles and Mechanisms of
  Particle Acceleration There

abstract:
  We analyse processes of particle acceleration in the Fermi Bubbles. The goal
of our investigations is to obtain restrictions for acceleration mechanisms.
Our analysis of the three processes: acceleration from background plasma,
re-acceleration of relativistic electrons emitted by supernova remnants, and
acceleration by shocks generated by processes of star tidal disruption in the
Galactic Center, showed that the model of multi-shock acceleration does not
have serious objections at present and therefore seems us more attractive than
others.


title:
On the Complexity and Approximation of Binary Evidence in Lifted
  Inference

abstract:
  Lifted inference algorithms exploit symmetries in probabilistic models to
speed up inference. They show impressive performance when calculating
unconditional probabilities in relational models, but often resort to
non-lifted inference when computing conditional probabilities. The reason is
that conditioning on evidence breaks many of the model's symmetries, which can
preempt standard lifting techniques. Recent theoretical results show, for
example, that conditioning on evidence which corresponds to binary relations is
#P-hard, suggesting that no lifting is to be expected in the worst case. In
this paper, we balance this negative result by identifying the Boolean rank of
the evidence as a key parameter for characterizing the complexity of
conditioning in lifted inference. In particular, we show that conditioning on
binary evidence with bounded Boolean rank is efficient. This opens up the
possibility of approximating evidence by a low-rank Boolean matrix
factorization, which we investigate both theoretically and empirically.


title: Plasma injection and outflow formation in Kerr black holes

abstract:
  We discuss the role plasma injection plays in the formation of outflows in
Kerr spacetime. Using a model for the double flow established in the polar
region of a rotating black hole, we study the interplay between the different
processes that can power the outflow. In particular, we find two types of flows
with distinct properties that depend on the rate at which energy is deposited
in the magnetosphere. We discuss the implications of this result for gamma ray
bursts outflows.


title:
Capillary-gravity water waves with discontinuous vorticity: existence
  and regularity results

abstract:
  In this paper we construct periodic capillarity-gravity water waves with an
arbitrary bounded vorticity distribution. This is achieved by reexpressing, in
the height function formulation of the water wave problem, the boundary
condition obtained from Bernoulli's principle as a nonlocal differential
equation. This enables us to establish the existence of weak solutions of the
problem by using elliptic estimates and bifurcation theory. Secondly, we
investigate the a priori regularity of these weak solutions and prove that they
are in fact strong solutions of the problem, describing waves with a
real-analytic free surface. Moreover, assuming merely integrability of the
vorticity function, we show that any weak solution corresponds to flows having
real-analytic streamlines.


title: Auto-adaptative Laplacian Pyramids for High-dimensional Data Analysis

abstract:
  Non-linear dimensionality reduction techniques such as manifold learning
algorithms have become a common way for processing and analyzing
high-dimensional patterns that often have attached a target that corresponds to
the value of an unknown function. Their application to new points consists in
two steps: first, embedding the new data point into the low dimensional space
and then, estimating the function value on the test point from its neighbors in
the embedded space.
  However, finding the low dimension representation of a test point, while easy
for simple but often not powerful enough procedures such as PCA, can be much
more complicated for methods that rely on some kind of eigenanalysis, such as
Spectral Clustering (SC) or Diffusion Maps (DM). Similarly, when a target
function is to be evaluated, averaging methods like nearest neighbors may give
unstable results if the function is noisy. Thus, the smoothing of the target
function with respect to the intrinsic, low-dimensional representation that
describes the geometric structure of the examined data is a challenging task.
  In this paper we propose Auto-adaptive Laplacian Pyramids (ALP), an extension
of the standard Laplacian Pyramids model that incorporates a modified LOOCV
procedure that avoids the large cost of the standard one and offers the
following advantages: (i) it selects automatically the optimal function
resolution (stopping time) adapted to the data and its noise, (ii) it is easy
to apply as it does not require parameterization, (iii) it does not overfit the
training set and (iv) it adds no extra cost compared to other classical
interpolation methods. We illustrate numerically ALP's behavior on a synthetic
problem and apply it to the computation of the DM projection of new patterns
and to the extension to them of target function values on a radiation
forecasting problem over very high dimensional patterns.


title:
On `The conformal metric structure of Geometrothermodynamics':
  Generalizations

abstract:
  We show that the range of applicability of the change of representation
formula derived in J. Math. Phys. \textbf{54}, 033513 (2013) [arXiv:1302.6928]
is very narrow and extend it to include all physical applications,
particularly, applications to black hole thermodynamics, cosmology and fluid
thermodynamics.


title: Field Measurement for Superconducting Magnets of ADS Injector I

abstract:
  The superconducting solenoid magnet prototype for ADS injection-I had been
fabricated in Beijing Qihuan Mechanical and Electric Engineer Company and
tested in Haerbin Institute of Technology (HIT) in Nov, 2012. Batch magnet
production was processed after some major revision from the magnet prototype,
they include: removing off the perm-alloy shield, extending the iron yoke,
using thin superconducting cable, etc. The first one of the batch magnets was
tested in the vertical Dewar in HIT in Sept. 2013. Field measurement was
carried out at the same time by the measurement platform that seated on the top
of the vertical Dewar. This paper will present the field measurement system
design, measurement results and discussion on the residual field from the
persistent current effect.


title: A non-grey analytical model for irradiated atmospheres. I: Derivation

abstract:
  Context. Semi-grey atmospheric models (with one opacity for the visible and
one opacity for the infrared) are useful to understand the global structure of
irradiated atmospheres, their dynamics and the interior structure and evolution
of planets, brown dwarfs and stars. But when compared to direct numerical
radiative transfer calculations for irradiated exoplanets, these models
systematically overestimate the temperatures at low optical depth,
independently of the opacity parameters. We wish to understand why semi-grey
models fail at low optical depths, and provide a more accurate approximation to
the atmospheric structure by accounting for the variable opacity in the
infrared. Our analytical irradiated non-grey model is found to provide a range
of temperatures that is consistent with that obtained by numerical
calculations. We find that even for slightly non-grey thermal opacities the
temperature structure differs significantly from previous semi-grey models. For
small values of beta (expected when lines are dominant), we find that the
non-grey effects are confined to low-optical depths. However, for beta larger
than 0.5 (appropriate in the presence of bands with a wavelength-dependence
smaller or comparable with the width of the Planck function), we find that the
temperature structure is affected even down to infrared optical depths unity
and deeper as a result of the so-called blanketing effect. The expressions that
we derive may be used to provide a proper functional form for algorithms that
invert the atmospheric properties from spectral information. Because a full
atmospheric structure can be calculated directly, these expressions should be
useful for simulations of the dynamics of these atmospheres and of the thermal
evolution of the planets. Finally, they should be used to test full radiative
transfer models and improve their convergence.


title:
Calculation ofthe transitions and migration of nitrogen and vacancy
  related defects,with implications on the formation of NV centers in bulk
  diamond

abstract:
  Formation and excitation energies as well charge transition levels, are
determined forthe substitutional nitrogen (Ns),the vacancy (V) and related
point defects (NV, NVH, N2, N2V and V2) by screened non-local hybrid density
functional supercell plane wave calculations in bulk diamond. In additionthe
activation energy for V and NV diffusion is calculated.We find good agreement
between theory and experiment for the previously well-establisheddata, and
predict missing ones. Based on the calculated properties of these defects, the
formation of the negatively charged nitrogen-vacancy center is studied, which
is a prominent candidate for application in quantum information processing and
for nanosensors. We find that the concentration of NV defects are limited in
natural diamonds due to the relatively high formation energy of NV. Our results
imply that NV defects dominantly form just in the early stage of annealing in
N-doped and irradiated diamonds. We find that the amphoteric divacancy defect
with multiple acceptor states may significantly influence the charge state and
photo-stability of NV in irradiated diamond samples.


title:
Topological susceptibility in lattice Yang-Mills theory with open
  boundary condition

abstract:
  We find that using open boundary condition in the temporal direction can
yield the expected value of the topological susceptibility in lattice SU(3)
Yang-Mills theory. As a further check, we show that the result agrees with
numerical simulations employing the periodic boundary condition. Our results
support the preferability of the open boundary condition over the periodic
boundary condition as the former allows for computation at smaller lattice
spacings needed for continuum extrapolation at a lower computational cost.


title: Optimal condition for measurement observable via error-propagation

abstract:
  Propagation of error is a widely used estimation tool in experiments, where
the estimation precision of the parameter depends on the fluctuation of the
physical observable. Thus which observable is chosen will greatly affect the
estimation sensitivity. Here we study the optimal observable for the ultimate
sensitivity bounded by the quantum Cram\'er-Rao theorem in parameter
estimation. By invoking the Schr\"odinger-Robertson uncertainty relation, we
derive the necessary and sufficient condition for the optimal observables
saturating the ultimate sensitivity for single parameter estimate. By applying
this condition to Greenberg-Horne-Zeilinger states, we obtain the general
expression of the optimal observable for separable measurements to achieve the
Heisenberg-limit precision and show that it is closely related to the parity
measurement. However, Jose {\em et al} [Phys. Rev. A {\bf 87}, 022330 (2013)]
have claimed that the Heisenberg limit may not be obtained via separable
measurements. We show this claim is incorrect.


title:
Large enhancement in the generation efficiency of pure spin currents in
  Ge using Heusler-compound Co_2FeSi electrodes

abstract:
  We show nonlocal spin transport in n-Ge based lateral spin-valve devices with
highly ordered Co_2FeSi/n^+-Ge Schottky tunnel contacts. Clear spin-valve
signals and Hanle-effect curves are demonstrated at low temperatures,
indicating generation, manipulation, and detection of pure spin currents in
n-Ge. The obtained spin generation efficiency of ~ 0.12 is about two orders of
magnitude larger than that for a device with Fe/MgO tunnel-barrier contacts
reported previously. Taking the spin related behavior with temperature
evolution into account, we infer that it is necessary to simultaneously
demonstrate the high spin generation efficiency and improve the quality of the
transport channel for achieving Ge based spintronic devices.


title: An asynchronous leapfrog method II

abstract:
  A second order explicit one-step numerical method for the initial value
problem of the general ordinary differential equation is proposed. It is
obtained by natural modifications of the well-known leapfrog method, which is a
second order, two-step, explicit method. According to the latter method, the
input data for an integration step are two system states, which refer to
different times. The usage of two states instead of a single one can be seen as
the reason for the robustness of the method. Since the time step size thus is
part of the step input data, it is complicated to change this size during the
computation of a discrete trajectory. This is a serious drawback when one needs
to implement automatic time step control.
  The proposed modification transforms one of the two input states into a
velocity and thus gets rid of the time step dependency in the step input data.
For these new step input data, the leapfrog method gives a unique prescription
how to evolve them stepwise.
  The stability properties of this modified method are the same as for the
original one: the set of absolute stability is the interval [-i,+i] on the
imaginary axis. This implies exponential growth of trajectories in situations
where the exact trajectory has an asymptote.
  By considering new evolution steps that are composed of two consecutive old
evolution steps we can average over the velocities of the sub-steps and get an
integrator with a much larger set of absolute stability, which is immune to the
asymptote problem.
  The method is exemplified with the equation of motion of a one-dimensional
non-linear oscillator describing the radial motion in the Kepler problem.


title: Matching and geometry of 2-step nilpotent Lie groups

abstract:
  In this paper we study contact structure on 2-step nilpotent, Heisenberg type
Lie groups. We decompose this Lie groups to center and orthogonal complement,
then investigate properties of both orthogonal Lie subgroups. Finally, we
provide a connection between matchings in groups and field extensions and
2-step nilpotent Lie groups.


title: On applying the subspace perturbation theory to few-body Hamiltonians

abstract:
  We present a selection of results on variation of the spectral subspace of a
Hermitian operator under a Hermitian perturbation and show how these results
may work for few-body Hamiltonians.

categories: quant-ph math-ph math.MP physics.atm-clus


title: Enhancing Approximations for Regular Reachability Analysis

abstract:
  This paper introduces two mechanisms for computing over-approximations of
sets of reachable states, with the aim of ensuring termination of state-space
exploration. The first mechanism consists in over-approximating the automata
representing reachable sets by merging some of their states with respect to
simple syntactic criteria, or a combination of such criteria. The second
approximation mechanism consists in manipulating an auxiliary automaton when
applying a transducer representing the transition relation to an automaton
encoding the initial states. In addition, for the second mechanism we propose a
new approach to refine the approximations depending on a property of interest.
The proposals are evaluated on examples of mutual exclusion protocols.


title: Random Grammar-based Testing for Covering All Non-Terminals

abstract:
  In the context of software testing, generating complex data inputs is
frequently performed using a grammar-based specification. For combinatorial
reasons, an exhaustive generation of the data -- of a given size -- is
practically impossible, and most approaches are either based on random
techniques or on coverage criteria. In this paper, we show how to combine these
two techniques by biasing the random generation in order to optimise the
probability of satisfying a coverage criterion.


title:
Self-generated interior blow-up solutions in fractional elliptic
  equation with absorption

abstract:
  In this paper we study positive solutions to problem involving the fractional
Laplacian $(E)$ $(-\Delta)^{\alpha} u(x)+|u|^{p-1}u(x)=0 in
x\in\Omega\setminus\mathcal{C}$, subject to the conditions $u(x)=0$
$x\in\Omega^c$ and $\lim_{x\in\Omega\setminus\mathcal{C},
x\to\mathcal{C}}u(x)=+\infty$, where $p>1$ and $\Omega$ is an open bounded
$C^2$ domain in $\mathbb{R}^N$, $\mathcal{C}\subset \Omega$ is a compact $C^2$
manifold with $N-1$ multiples dimensions and without boundary, the operator
$(-\Delta)^{\alpha}$ with $\alpha\in(0,1)$ is the fractional Laplacian.
  We consider the existence of positive solutions for problem $(E)$. Moreover,
we further analyze uniqueness, asymptotic behaviour and nonexistence.


title: Some effectivity questions for plane Cremona transformations

abstract:
  We give a way of estimating quickly the length of the hyperbolic isometry
associated to a plane Cremona transformation that is presented as the product
of two involutions. We also show, using the ideas of Cantat and Lamy, that,
provided that the ground field is either algebraic of characteristic not 2 or
of characteristic zero, the normal closure of a high power of such a
transformation is a proper subgroup of the Cremona group; this gives an
effective instantiation of some of their results. Moreover, we show that any
hyperbolic Cremona transformation is rigid and give a simple criterion for it
to be tight.
  This version is thoroughly revised from the previous version. In particular,
it corrects an error in an earlier version that was pointed out by Lonjou.


title: Choreography In Inter-Organizational Innovation Networks

abstract:
  This paper introduces the concept of choreography with respect to
inter-organizational innovation networks, as they constitute an attractive
environment to create innovation in different sectors. We argue that
choreography governs behaviours by shaping the level of connectivity and
cohesion among network members. It represents a valid organizational system
able to sustain some activities and to reach effects generating innovation
outcomes. This issue is tackled introducing a new framework in which we propose
a network model as prerequisite for our hypothesis. The analysis is focused on
inter-organizational innovation networks characterized by the presence of hubs,
semi-peripheral and peripheral members lacking hierarchical authority. We
sustain that the features of a network, bringing to synchronization phenomena,
are extremely similar to those existing in innovation network characterized by
the emergence of choreography. The effectiveness of our model is verified by
providing a real case study that gives preliminary empirical hints on the
network aptitude to perform choreography. Indeed, the innovation network
analysed in the case study reveals characteristics causing synchronization and
consequently the establishment of choreography.


title:
Vortex pinning vs superconducting wire network: origin of periodic
  oscillations induced by applied magnetic fields in superconducting films with
  arrays of nanomagnets

abstract:
  Hybrid magnetic arrays embedded in superconducting films are ideal systems to
study the competition between different physical (such as the coherence length)
and structural length scales such as available in artificially produced
structures. This interplay leads to oscillation in many magnetically dependent
superconducting properties such as the critical currents, resistivity and
magnetization. These effects are generally analyzed using two distinct models
based on vortex pinning or wire network. In this work, we show that for
magnetic dot arrays, as opposed to antidot (i.e holes) arrays, vortex pinning
is the main mechanism for field induced oscillations in resistance R(H),
critical current Ic(H), magnetization M(H) and ac-susceptibility Xac(H) in a
broad temperature range. Due to the coherence length divergence at Tc, a
crossover to wire network behavior is experimentally found. While pinning
occurs in a wide temperature range up to Tc, wire network behavior is only
present in a very narrow temperature window close to Tc. In this temperature
interval, contributions from both mechanisms are operational but can be
experimentally distinguished.


title: On the Holonomic Equivalence of Two Curves

abstract:
  Given a principal $G$-bundle $P \to M$ and two $C^1$ curves in $M$ with
coinciding endpoints, we say that the two curves are holonomically equivalent
if the parallel transport along them is identical for any smooth connection on
$P$. The main result in this paper is that if $G$ is semi-simple, then the two
curves are holonomically equivalent if and only if there is a thin, i.e. of
rank at most one, $C^1$ homotopy linking them. Additionally, it is also
demonstrated that this is equivalent to the factorizability through a tree of
the loop formed from the two curves and to the reducibility of a certain
transfinite word associated to this loop. The curves are not assumed to be
regular.


title: Rational curves on Calabi-Yau threefolds and a conjecture of Oguiso

abstract:
  This short note is an extended abstract of a talk given at the conference
"Komplexe Analysis" at the Mathematisches Forschungsinstitut Oberwolfach in
September 2012. We explained some recent results about the existence of
rational curves on Calabi-Yau threefolds as well as a curvature approach to the
non hyperbolicity of such manifolds.


title: About the hyperbolicity of complete intersections

abstract:
  This note is an extended version of a thirty minutes talk given at the "XIX
Congresso dell'Unione Matematica Italiana", held in Bologna from September 12th
to September 17th, 2011. This was essentially a survey talk about connections
between Kobayashi hyperbolicity properties and positivity properties of the
canonical bundle of projective algebraic varieties.


title: The volume of positive braid links

abstract:
  Based on recent work by Futer, Kalfagianni and Purcell, we prove that the
volume of sufficiently complicated positive braid links is proportional to the
signature defect $\Delta \sigma=2g-\sigma$.


title: Improved approximation algorithm for Fault-Tolerant Facility Placement

abstract:
  We consider the Fault-Tolerant Facility Placement problem ($FTFP$), which is
a generalization of the classical Uncapacitated Facility Location problem
($UFL$). In the $FTFP$ problem we have a set of clients $C$ and a set of
facilities $F$. Each facility $i \in F$ can be opened many times. For each
opening of facility $i$ we pay $f_i \geq 0$. Our goal is to connect each client
$j \in C$ with $r_j \geq 1$ open facilities in a way that minimizes the total
cost of open facilities and established connections.
  In a series of recent papers $FTFP$ was essentially reduced to $FTFL$ and
then to $UFL$ showing it could be approximated with ratio $1.575$. In this
paper we show that $FTFP$ can actually be approximated even better. We consider
approximation ratio as a function of $r = min_{j \in C} r_j$ (minimum
requirement of a client). With increasing $r$ the approximation ratio of our
algorithm $\lambda_r$ converges to one. Furthermore, for $r > 1$ the value of
$\lambda_r$ is less than 1.463 (hardness of approximation of $UFL$). We also
show a lower bound of 1.278 for the approximability of the Fault-Tolerant
Facility Location problem ($FTFL$) for arbitrary $r$. Already for $r > 3$ we
obtain that $FTFP$ can be approximated with ratio 1.275, showing that under
standard complexity theoretic assumptions $FTFP$ is strictly better
approximable than $FTFL$.


title:
Recent Progress in III-V based ferromagnetic semiconductors: Band
  structure, Fermi level, and tunneling transport

abstract:
  Spin-based electronics or spintronics is an emerging field, in which we try
to utilize spin degrees of freedom as well as charge transport in materials and
devices. While metal-based spin-devices, such as magnetic-field sensors and
magnetoresistive random access memory using giant magnetoresistance and
tunneling magnetoresistance, are already put to practical use,
semiconductor-based spintronics has greater potential for expansion because of
good compatibility with existing semiconductor technology. Many
semiconductor-based spintronics devices with useful functionalities have been
proposed and explored so far. To realize those devices and functionalities, we
definitely need appropriate materials which have both the properties of
semiconductors and ferromagnets. Ferromagnetic semiconductors (FMS), which are
alloy semiconductors containing magnetic atoms such as Mn and Fe, are one of
the most promising classes of materials for this purpose, and thus have been
intensively studied for the past two decades. Here, we review the recent
progress in the studies of the most prototypical III-V based FMS, p-type
(GaMn)As, and its heterostructures with focus on tunneling transport, Fermi
level, and bandstructure. Furthermore, we cover the properties of a new n-type
FMS, (InFe)As, which shows electron-induced ferromagnetism. These FMS materials
having zinc-blende crystal structure show excellent compatibility with
well-developed III-V heterostructures and devices.


title:
Circularly Polarised X-ray Scattering Investigation of Spin-Lattice
  Coupling in TbMnO$_3$ in Crossed Electric and Magnetic Fields

abstract:
  We present a study of the magnetic and crystallographic structure of
TbMnO$_3$ in the presence of crossed electric and magnetic fields using
circularly polarised X-ray non-resonant scattering. A comprehensive account is
presented of the scattering theory and data analysis methods used in our
earlier studies, and in addition we present new high magnetic field data and
its analysis. We discuss in detail how polarisation analysis was used to reveal
structural information, including the arrangement of Tb moments which we
proposed for $H = 0$ T, and how the diffraction data for $H<H_C$ can be used to
determine specific magnetostrictively induced atomic displacements with
femto-metre accuracy. The connection between the electric polarisation and
magnetostrictive mechanisms is discussed. Similar magnetostrictive
displacements have been observed for $H > H_C$ as for $H < H_C$. Finally some
observations regarding the kinetics and the conservation of domain population
at the transition are described.


title:
The second order hydrodynamic transport coefficient $\kappa$ for the
  gluon plasma from the lattice

abstract:
  The quark gluon plasma produced in heavy ion collisions behaves like an
almost ideal fluid described by viscous hydrodynamics with a number of
transport coefficients. The second order coefficient $\kappa$ is related to a
Euclidean correlator of the energy-momentum tensor at vanishing frequency and
low momentum. This allows for a lattice determination without maximum entropy
methods or modelling, but the required lattice sizes represent a formidable
challenge. We calculate $\kappa$ in leading order lattice perturbation theory
and simulations on $120^3\times 6,8$ lattices with $a<0.1$ fm. In the
temperature range $2T_\mathrm{c}-10T_\mathrm{c}$ we find $\kappa=0.36(15)T^2$.
The error covers both a suitably rescaled AdS/CFT prediction as well as,
remarkably, the result of leading order perturbation theory. This suggests that
appropriate noise reduction methods on the lattice and NLO perturbative
calculations could provide an accurate QCD prediction in the near future.


title:
Canonical versus noncanonical equilibration dynamics of open quantum
  systems

abstract:
  In statistical mechanics, any quantum system in equilibrium with its weakly
coupled reservoir is described by a canonical state at the same temperature as
the reservoir. Here, by studying the equilibration dynamics of a harmonic
oscillator interacting with a reservoir, we evaluate microscopically the
condition under which the equilibration to a canonical state is valid. It is
revealed that the non-Markovian effect and the availability of a stationary
state of the total system play a profound role in the equilibration. In the
Markovian limit, the conventional canonical state can be recovered. In the
non-Markovian regime, when the stationary state is absent, the system
equilibrates to a generalized canonical state at an effective temperature;
whenever the stationary state is present, the equilibrium state of the system
cannot be described by any canonical state anymore. Our finding of the physical
condition on such noncanonical equilibration might have significant impact on
statistical physics. A physical scheme based on circuit QED is proposed to test
our results.


title:
Monte Carlo modeling of spallation targets containing uranium and
  americium

abstract:
  Neutron production and transport in spallation targets made of uranium and
americium are studied with a Geant4-based code MCADS (Monte Carlo model for
Accelerator Driven Systems). A good agreement of MCADS results with
experimental data on neutron- and proton-induced reactions on $^{241}$Am and
$^{243}$Am nuclei allows to use this model for simulations with extended Am
targets. It was demonstrated that MCADS model can be used for calculating the
values of critical mass for $^{233,235}$U, $^{237}$Np, $^{239}$Pu and
$^{241}$Am. Several geometry options and material compositions (U, U+Am, Am,
Am$_2$O$_3$) are considered for spallation targets to be used in Accelerator
Driven Systems. All considered options operate as deep subcritical targets
having neutron multiplication factor of $k \sim 0.5$. It is found that more
than 4 kg of Am can be burned in one spallation target during the first year of
operation.


title: Constructibility of tempered solutions of holonomic D-modules

abstract:
  In this paper we prove the constructibility on the subanalytic sites of the
sheaves of tempered holomorphic solutions of holonomic D-modules on complex
analytic manifolds. Such a result solves a conjecture of M. Kashiwara and P.
Schapira (2003).


title: Inverting Ray-Knight identity

abstract:
  We provide a short proof of the Ray-Knight second generalized Theorem, using
a martingale which can be seen (on the positive quadrant) as the Radon-Nikodym
derivative of the reversed vertex-reinforced jump process measure with respect
to the Markov jump process with the same conductances. Next we show that a
variant of this process provides an inversion of that Ray-Knight identity. We
give a similar result for the Ray-Knight first generalized Theorem.


title:
Transfer of Vibrational Coherence Through Incoherent Energy Transfer
  Process in F\"{o}rster Limi

abstract:
  We study transfer of coherent nuclear oscillations between an excitation
energy donor and an acceptor in a simple dimeric electronic system coupled to
an unstructured thermodynamic bath and some pronounced vibrational
intramolecular mode. Our focus is on the non-linear optical response of such a
system, i.e. we study both excited state energy transfer and the compensation
of the so-called ground state bleach signal. The response function formalism
enables us to investigate a heterodimer with monomers coupled strongly to the
bath and by a weak resonance coupling to each other (F\"{o}rster rate limit).
Our work is motivated by recent observation of various vibrational signatures
in 2D coherent spectra of energy transferring systems including large
structures with a fast energy diffusion. We find that the vibrational coherence
can be transferred from donor to acceptor molecules provided the transfer rate
is sufficiently fast. The ground state bleach signal of the acceptor molecules
does not show any oscillatory signatures, and oscillations in ground state
bleaching signal of the donor prevail with the amplitude which is not
decreasing with the relaxation rate.


title: Limiting Bourgain-Brezis estimates for systems: theme and variations

abstract:
  J. Bourgain and H. Brezis have obtained in 2002 some new and surprising
estimates for systems of linear differential equations, dealing with the
endpoint case $\mathrm{L}^1$ of singular integral estimates and the critical
Sobolev space $\mathrm{W}^{1, n} (\mathbf{R}^n)$. This paper presents an
overview of the results, further developments over the last ten years and
challenging open problems.


title:
Computational biology approach to uncover hepatitis C virus helicase
  operation

abstract:
  Hepatitis C virus helicase is a molecular motor that splits nucleic acid
duplex structures during viral replication, therefore representing a promising
target for antiviral treatment. Hence, a detailed understanding of the
mechanism by which it operates would facilitate the development of efficient
drug-assisted therapies aiming to inhibit helicase activity. Despite extensive
investigations performed in the past, a thorough understanding of the activity
of this important protein was lacking since the underlying internal
conformational motions could not be resolved. Here we review investigations
that have been previously performed by us for HCV helicase. Using methods of
structure-based computational modelling it became possible to follow entire
operation cycles of this motor protein in structurally resolved simulations and
uncover the mechanism by which it moves along the nucleic acid and accomplishes
strand separation. We also discuss observations from that study in the light of
recent experimental studies that confirm our findings.


title: Nucleon Excited State Wave Functions from Lattice QCD

abstract:
  We apply the eigenvectors from a variational analysis to successfully extract
the wave functions of even-parity excited states of the nucleon, including the
Roper. We explore the first four states in the spectrum excited by the standard
nucleon interpolating field. We find that the states exhibit a structure
qualitatively consistent with a constituent quark model, where the ground,
first-, second- and third-excited states have 0, 1, 2, and 3 nodes in the
radial wave function of the d-quark about two $u$ quarks at the origin.
Moreover the radial amplitude of the probability distribution is similar to
that predicted by constituent quark models. We present a detailed examination
of the quark-mass dependence of the probability distributions for these states,
searching for a nontrivial role for the multi-particle components mixed in the
finite-volume QCD eigenstates. Finally we examine the dependence of the d-quark
probability distribution on the positions of the two u quarks. The results are
fascinating, with the underlying S-wave orbitals governing the distributions
even at rather large u-quark separations.


title: Modelling low-mass resonances in multi-body decays

abstract:
  Recent advances towards a model-independent description of hadronic few-body
final states, relevant for the extraction of direct CP violation from the
decays of heavy mesons, are presented.


title:
The asymmetric simple exclusion process on chains with a shortcut
  revisited

abstract:
  We consider the asymmetric simple exclusion process (TASEP) on open network
consisting of three consecutively coupled macroscopic chain segments with a
shortcut between the tail of the first segment and the head of the third one.
The model was introduced by Y.-M. Yuan et al [J. Phys. A 40, 12351 (2007)] to
describe directed motion of molecular motors along filaments. We report here
unexpected results in the case of maximum current through the network which
revise the previous findings. Our theoretical analysis, based on the effective
rates approximation, shows that the second (shunted) segment can exist in both
low-density and high-density phases, as well as in the coexistence (shock)
phase. Numerical simulations demonstrate that it is the last option that takes
place - the local density distribution and the nearest-neighbor correlations in
the middle chain correspond to a shock phase with completely delocalized domain
wall. Surprisingly, the main quantitative parameters of that shock phase are
governed by a real root of a cubic equation the coefficients of which simply
depend on the probability of choosing the shortcut. The unexpected conclusion
is that a shortcut in the bulk of a single lane always creates traffic jams.


title: Higgs as a Top-Mode Pseudo

abstract:
  In the spirit of the top quark condensation, we propose a model which has a
naturally light composite Higgs boson, "tHiggs", to be identified with the 126
GeV Higgs discovered at the LHC. The tHiggs, a bound state of the top quark and
its flavor (vector-like) partner, emerges as a pseudo Nambu-Goldstone boson
(NGB), "Top-Mode Pseudo", together with the exact NGBs to be absorbed into the
W and Z bosons as well as another (heavier) Top-Mode Pseudo (CP-odd composite
scalar). Those five composite (exact/pseudo) NGBs are dynamically produced
simultaneously by a single supercritical four-fermion interaction having U(3) x
U(1) symmetry which includes the electroweak symmetry, where the vacuum is
aligned by small explicit breaking term so as to break the symmetry down to a
subgroup, U(2) x U(1)', in a way not to retain the electroweak symmetry, in
sharp contrast to the little Higgs models. The explicit breaking term for the
vacuum alignment gives rise to a mass of the tHiggs, which is protected by the
symmetry and hence naturally controlled against radiative corrections.
Realistic top quark mass is easily realized similarly to the top-seesaw
mechanism by introducing an extra (subcritical) four-fermion coupling which
explicitly breaks the residual U(2) x U(1)' symmetry. We present a
phenomenological Lagrangian of the Top-Mode Pseudos along with the standard
model particles, which will be useful for the study of the collider
phenomenology. The coupling property of the tHiggs is shown to be consistent
with the currently available data reported from the LHC. Several
phenomenological consequences and constraints from experiments are also
addressed.


title: Superconductivity and Magnetism in YFe$_2$Ge$_2$

abstract:
  We report calculations of the electronic structure and magnetic properties of
YFe$_2$Ge$_2$ and discuss the results in terms of the observed
superconductivity near magnetism. We find that YFe$_2$Ge$_2$ is a material near
a magnetic quantum critical point based on comparison of standard density
functional results that predict magnetism with experiment. The band structure
and Fermi surfaces are very three dimensional and higher conductivity is
predicted in the $c$-axis direction. The magnetism is of Stoner type and is
predominately from an in-plane ferromagnetic tendency. The inter-layer coupling
is weak giving a perhaps 2D character to the magnetism, which is in contrast to
the conductivity and may be important for suppressing the ordering tendency.
This is compatible with a triplet superconducting state mediated by spin
fluctuations.


title: Broadband plasmonic absorber for photonic integrated circuits

abstract:
  The loss of surface plasmon polaritons has long been considered as a fatal
shortcoming in information transport. Here we propose a plasmonic absorber
utilizing this "shortcoming" to absorb the stray light in photonic integrated
circuits (PICs). Based on adiabatic mode evolution, its performance is
insensitive to incident wavelength with bandwidth larger than 300nm, and robust
against surrounding environment and temperature. Besides, the use of metal
enables it to be very compact and beneficial to thermal dissipation. With this
40um-long absorber, the absorption efficiency can be over 99.8% at 1550nm, with
both the reflectivity and transmittance of incident light reduced to less than
0.1%. Such device may find various applications in PICs, to eliminate the
residual strong pump laser or stray light.


title:
Ultra-nonlocality in density functional theory for photo-emission
  spectroscopy

abstract:
  We derive an exact expression for the photo-current of photo-emission
spectroscopy using time-dependent current density functional theory (TDCDFT).
This expression is given as an integral over the Kohn-Sham spectral function
renormalized by effective potentials that depend on the exchange-correlation
kernel of current density functional theory. We analyze in detail the physical
content of this expression by making a connection between the
density-functional expression and the diagrammatic expansion of the
photo-current within many-body perturbation theory. We further demonstrate that
the density functional expression does not provide us with information on the
kinetic energy distribution of the photo-electrons. Such information can, in
principle, be obtained from TDCDFT by exactly modeling the experiment in which
the photo-current is split into energy contributions by means of an external
electromagnetic field outside the sample, as is done in standard detectors. We
find, however, that this procedure produces very nonlocal correlations between
the exchange-correlation fields in the sample and the detector.


title: First X-ray observations of Low-Power Compact Steep Spectrum Sources

abstract:
  We report first X-ray Chandra observations of a sample of seven low
luminosity compact (LLC) sources. They belong to a class of young compact steep
spectrum (CSS) radio sources. Four of them have been detected, the other three
have upper limit estimations for X-ray flux, one CSS galaxy is associated with
an X-ray cluster. We have used the new observations together with the
observational data for known strong CSS and gigahertz-peaked spectrum (GPS)
objects and large scale FRIs and FRIIs to study the relation between
morphology, X-ray properties and excitation modes in radio-loud AGNs. We found
that: (1) The low power objects fit well to the already established X-ray -
radio luminosity correlation for AGNs and occupy the space among, weaker in the
X-rays, FRI objects. (2) The high excitation galaxies (HEG) and low excitation
galaxies (LEG) occupy distinct locus in the radio/X-ray luminosity plane,
notwithstanding their evolutionary stage. This is in agreement with the
postulated different origin of the X-ray emission in these two group of
objects. (3) We have tested the AGN evolution models by comparing the
radio/X-ray luminosity ratio with the size of the sources, and indirectly, with
their age. We conclude that the division for two different X-ray emission
modes, namely originate in the base of the relativistic jet (FRIs) or in the
accretion disk (FRIIs) is already present among the younger compact AGNs. (4)
Finally, we found that the CSS sources are less obscured than the more compact
GPSs in X-rays. However, the anti-correlation between X-ray column density and
radio size does not hold for the whole sample of GPS and CSS objects.


title:
Observation of grand-canonical number statistics in a photon
  Bose-Einstein condensate

abstract:
  We report measurements of particle number correlations and fluctuations of a
photon Bose-Einstein condensate in a dye microcavity using a Hanbury
Brown-Twiss experiment. The photon gas is coupled to a reservoir of molecular
excitations, which serve both as heat bath and particle reservoir to realize
grand-canonical conditions. For large reservoirs, we observe strong number
fluctuations of order of the total particle number extending deep into the
condensed phase. Our results demonstrate that Bose-Einstein condensation under
grand-canonical ensemble conditions does not imply second-order coherence.


title: Multiuser Random Coding Techniques for Mismatched Decoding

abstract:
  This paper studies multiuser random coding techniques for channel coding with
a given (possibly suboptimal) decoding rule. For the mismatched discrete
memoryless multiple-access channel, an error exponent is obtained that is tight
with respect to the ensemble average, and positive within the interior of
Lapidoth's achievable rate region. This exponent proves the ensemble tightness
of the exponent of Liu and Hughes in the case of maximum-likelihood decoding.
An equivalent dual form of Lapidoth's achievable rate region is given, and the
latter is shown to extend immediately to channels with infinite and continuous
alphabets. In the setting of single-user mismatched decoding, similar analysis
techniques are applied to a refined version of superposition coding, which is
shown to achieve rates at least as high as standard superposition coding for
any set of random-coding parameters.


title: High-dimensional influence measure

abstract:
  Influence diagnosis is important since presence of influential observations
could lead to distorted analysis and misleading interpretations. For
high-dimensional data, it is particularly so, as the increased dimensionality
and complexity may amplify both the chance of an observation being influential,
and its potential impact on the analysis. In this article, we propose a novel
high-dimensional influence measure for regressions with the number of
predictors far exceeding the sample size. Our proposal can be viewed as a
high-dimensional counterpart to the classical Cook's distance. However, whereas
the Cook's distance quantifies the individual observation's influence on the
least squares regression coefficient estimate, our new diagnosis measure
captures the influence on the marginal correlations, which in turn exerts
serious influence on downstream analysis including coefficient estimation,
variable selection and screening. Moreover, we establish the asymptotic
distribution of the proposed influence measure by letting the predictor
dimension go to infinity. Availability of this asymptotic distribution leads to
a principled rule to determine the critical value for influential observation
detection. Both simulations and real data analysis demonstrate usefulness of
the new influence diagnosis measure.


title: A Natural Topological Insulator

abstract:
  The earth's crust and outer space are rich sources of technologically
relevant materials which have found application in a wide range of fields.
Well-established examples are diamond, one of the hardest known materials, or
graphite as a suitable precursor of graphene. The ongoing drive to discover
novel materials useful for (opto)electronic applications has recently drawn
strong attention to topological insulators. Here, we report that Kawazulite, a
mineral with the approximate composition Bi$_2$(Te,Se)$_2$(Se,S), represents a
naturally occurring topological insulator whose electronic properties compete
well with those of its synthetic counterparts. Kawazulite flakes with a
thickness of a few tens of nanometers were prepared by mechanical exfoliation.
They exhibit a low intrinsic bulk doping level and correspondingly a sizable
mobility of surface state carriers of more than $1000 \text{cm}^2/(\text{V s})$
at low temperature. Based on these findings, further minerals which due to
their minimized defect densities display even better electronic characteristics
may be identified in the future.


title: $K$-anonymous Signaling Scheme

abstract:
  We incorporate signaling scheme into Ad Auction setting, to achieve better
welfare and revenue while protect users' privacy. We propose a new
\emph{$K$-anonymous signaling scheme setting}, prove the hardness of the
corresponding welfare/revenue maximization problem, and finally propose the
algorithms to approximate the optimal revenue or welfare.


title:
Computational screening study towards redox-active metal-organic
  frameworks

abstract:
  The metal-organic framework (MOF) MFU-4l containing Co(II) centers and Cl-
ligands has recently shown promising redox activity. Aiming for further
improved MOF catalysts for oxidation processes employing molecular oxygen we
present a density-functional theory (DFT) based computational screening
approach to identify promising metal center and ligand combinations within the
MFU-4l structural family. Using the O2 binding energy as a descriptor for the
redox property, we show that relative energetic trends in this descriptor can
reliably be obtained at the hybrid functional DFT level and using small cluster
(scorpionate-type complex) models. Within this efficient computational protocol
we screen a range of metal center / ligand combinations and identify several
candidate systems that offer more exothermic O2 binding than the original
Co/Cl-based MFU-4l framework.


title: Local structural excitations in model glasses

abstract:
  Structural excitations of model Lennard-Jones glass systems are investigated
using the Activation-Relaxation-Technique (ART), which explores the potential
energy landscape of a local minimum energy configuration by converging to a
nearby saddle-point configuration. Performing ART results in a distribution of
barrier energies that is single-peaked for well relaxed samples. The present
work characterises such atomic scale excitations in terms of their local
structure and environment. It is found that, at zero applied stress, many of
the identified events consist of chain-like excitations that can either be
extended or ring-like in their geometry. The location and activation energy of
these saddle-point structures are found to correlate with the type of atom
involved, and with spatial regions that have low shear moduli and are close to
the excess free volume within the configuration. Such correlations are however
weak and more generally the identified local structural excitations are seen to
exist throughout the model glass sample. The work concludes with a discussion
within the framework of $\alpha$ and $\beta$ relaxation processes that are
known to occur in the under-cooled liquid regime.


title: Novel collective excitations in a hot scalar field theory

abstract:
  We study the spectrum of quasiparticles in a scalar quantum field theory at
high temperature. Our results indicate the existence of novel quasiparticles
with purely collective origin at low momenta for some choices of the masses and
coupling. Scalar fields play a prominent role in many models of cosmology, and
their collective excitations could be relevant for transport phenomena in the
early universe.


title:
On the long-term correlation between the flux in the Ca II H & K and
  Halpha lines for FGK stars

abstract:
  The re-emission in the cores of the Ca II H & K and H$\alpha$ lines, are well
known proxies of stellar activity. However, these activity indices probe
different activity phenomena, the first being more sensitive to plage
variation, while the other one being more sensitive to filaments. In this paper
we study the long-term correlation between $\log R'_{HK}$ and $\log
I_{H\alpha}$, two indices based on the Ca II H & K and H$\alpha$ lines
respectively, for a sample of 271 FGK stars using measurements obtained over a
$\sim$9 year time span. Because stellar activity is one of the main obstacles
to the detection of low-mass and long-period planets, understanding further
this activity index correlation can give us some hints about the optimal target
to focus on, and ways to correct for these activity effects. We found a great
variety of long-term correlations between $\log R'_{HK}$ and $\log
I_{H\alpha}$. Around 20% of our sample has strong positive correlation between
the indices while about 3% show strong negative correlation. These fractions
are compatible with those found for the case of early-M dwarfs. Stars
exhibiting a positive correlation have a tendency to be more active when
compared to the median of the sample, while stars showing a negative
correlation are more present among higher metallicity stars. There is also a
tendency for the positively correlated stars to be more present among the
coolest stars, a result which is probably due to the activity level effect on
the correlation. Activity level and metallicity seem therefore to be playing a
role on the correlation between $\log R'_{HK}$ and $\log I_{H\alpha}$. Possible
explanations based on the influence of filaments for the diversity in the
correlations between these indices are discussed in this paper.


title: Dynamics of CO in Amorphous Water Ice Environments

abstract:
  The long-timescale behavior of adsorbed carbon monoxide on the surface of
amorphous water ice is studied under dense cloud conditions by means of
off-lattice, on-the-fly, kinetic Monte Carlo simula- tions. It is found that
the CO mobility is strongly influenced by the morphology of the ice substrate.
Nanopores on the surface provide strong binding sites which can effectively
immobilize the adsorbates at low coverage. As the coverage increases, these
strong binding sites are gradually occupied leav- ing a number of admolecules
with the ability to diffuse over the surface. Binding energies, and the energy
barrier for diffusion are extracted for various coverages. Additionally, the
mobility of CO is determined from isothermal desorption experiments. Reasonable
agreement on the diffusivity of CO is found with the simulations. Analysis of
the 2152 cm$^{-1}$, polar CO band supports the computational findings that the
pores in the water ice provide the strongest binding sites and dominate
diffusion at low temperatures.


title:
Far-infrared molecular lines from Low- to High-Mass Star Forming Regions
  observed with Herschel

abstract:
  (Abridged) We study the response of the gas to energetic processes associated
with high-mass star formation and compare it with studies on low- and
intermediate-mass young stellar objects (YSOs) using the same methods. The
far-IR line emission and absorption of CO, H$_2$O, OH, and [OI] reveals the
excitation and the relative contribution of different species to the gas
cooling budget. Herschel-PACS spectra covering 55-190 um are analyzed for ten
high-mass star forming regions of various luminosities and evolutionary stages
at spatial scales of ~10^4 AU. Radiative transfer models are used to determine
the contribution of the envelope to the far-IR CO emission.
  The close environments of high-mass YSOs show strong far-IR emission from
molecules, atoms, and ions. Water is detected in all 10 objects even up to high
excitation lines. CO lines from J=14-13 up to typically 29-28 show a single
temperature component, Trot~300 K. Typical H$_2$O temperatures are Trot~250 K,
while OH has Trot~80 K. Far-IR line cooling is dominated by CO (~75 %) and to a
smaller extent by OI (~20 %), which increases for the most evolved sources.
H$_2$O is less important as a coolant for high-mass sources because many lines
are in absorption. Emission from the envelope is responsible for ~45-85 % of
the total CO luminosity in high-mass sources compared with only ~10 % for
low-mass YSOs. The highest-J lines originate most likely from shocks, based on
the strong correlation of CO and H$_2$O with physical parameters of the sources
from low- to high-masses. Excitation of warm CO is very similar for all mass
regimes, whereas H$_2$O temperatures are ~100 K higher for high-mass sources
than the low-mass YSOs. Molecular cooling is ~4 times more important than
cooling by [OI]. The total far-IR line luminosity is about 10$^{-3}$ and
10$^{-5}$ times lower than the dust luminosity for the low- and high-mass YSOs.


title: All you ever wanted to know about the quantum Zeno effect in 70 minutes

abstract:
  This is a primer on the quantum Zeno effect, addressed to students and
researchers with no previous knowledge on the subject. The prerequisites are
the Schr\"odinger equation and the von Neumann notion of projective
measurement.


title:
Large area buried nanopatterning by broad ion implantation without any
  mask or direct writing

abstract:
  We have introduced here a simple, single step and cost effective broad ion
beam technique for preparation of nanoscale electronic, magnetic, optical and
mechanical devices without the need of resist, mask, or focused electron and
ion beams. In this approach, broad beam ion implantation of desired atom on a
prefabricated ion beam patterned surface promotes site selective deposition by
adjusting the local angle of ion implantation. We show that implantation of Fe
ions on an O+ induced pre fabricated triangular shaped patterned Si surface
results in a self-organized periodic array of striped magnetic nanostructures
having several micron length and about 50 nm width arranged with a lateral
separation of ~ 200 nm. The morphology, composition, crystalline structure and
magnetic property of these nanopatterns have been analyzed and the crucial
feature of such nanopattern formation by broad beam ion implantation is
explained.


title: DoF Analysis of the K-user MISO Broadcast Channel with Alternating CSIT

abstract:
  We consider a $K$-user multiple-input single-output (MISO) broadcast channel
(BC) where the channel state information (CSI) of user $i(i=1,2,\ldots,K)$ may
be either perfect (P), delayed (D) or not known (N) at the transmitter with
probabilities $\lambda_P^i$, $\lambda_D^i$ and $\lambda_N^i$, respectively. In
this channel, according to the three possible CSIT for each user, joint CSIT of
the $K$ users could have at most $3^K$ realizations. Although the results by
Tandon et al. show that the Degrees of Freedom (DoF) region for the two user
MISO BC with symmetric marginal probabilities (i.e., $\lambda_Q^i=\lambda_Q
\forall i\in \{1,2,\ldots,K\}, Q\in \{P,D,N\}$) depends only on the marginal
probabilities, we show that this interesting result does not hold in general
when the number of users is more than two. In other words, the DoF region is a
function of the \textit{CSIT pattern}, or equivalently, all the joint
probabilities. In this paper, given the marginal probabilities of CSIT, we
derive an outer bound for the DoF region of the $K$-user MISO BC. Subsequently,
the achievability of these outer bounds are considered in certain scenarios.
Finally, we show the dependence of the DoF region on the joint probabilities.


title: Braess paradox at the mesoscopic scale

abstract:
  We theoretically demonstrate that the transport inefficiency recently found
experimentally for branched-out mesoscopic networks can also be observed in a
quantum ring of finite width with an attached central horizontal branch. This
is done by investigating the time evolution of an electron wave packet in such
a system. Our numerical results show that the conductivity of the ring does not
necessary improves if one adds an extra channel. This ensures that there exists
a quantum analogue of the Braess Paradox, originating from quantum scattering
and interference.


title: N-body Dark Matter Haloes with simple Hierarchical Histories

abstract:
  We present a new algorithm which groups the subhaloes found in cosmological
N- body simulations by structure finders such as SUBFIND into dark matter
haloes whose formation histories are strictly hierarchical. One advantage of
these `Dhaloes' over the commonly used friends-of-friends (FoF) haloes is that
they retain their individual identity in cases when FoF haloes are artificially
merged by tenuous bridges of particles or by an overlap of their outer diffuse
haloes. Dhaloes are thus well-suited for modelling galaxy formation and their
merger trees form the basis of the Durham semi-analytic galaxy formation model,
GALFORM. Applying the Dhalo construction to the LambdaCDM Millennium-2
simulation we find that approximately 90% of Dhaloes have a one-to-one,
bijective match with a corresponding FoF halo. The remaining 10% are typically
secondary components of large FoF haloes. Although the mass functions of both
types of haloes are similar, the mass of Dhaloes correlates much more tightly
with the virial mass, M200, than FoF haloes. Approximately 80% of FoF and
bijective and non-bijective Dhaloes are relaxed according to standard criteria.
For these relaxed haloes all three types have similar concentration-M200
relations and, at fixed mass, the concentration distributions are described
accurately by log-normal distributions.


title:
Quantum Spin Hall Effect in Two-dimensional Crystals of Transition Metal
  Dichalcogenides

abstract:
  We propose to engineer time-reversal-invariant topological insulators in
two-dimensional (2D) crystals of transition metal dichalcogenides (TMDCs). We
note that, at low doping, semiconducting TMDCs under shear strain will develop
spin-polarized Landau levels residing in different valleys. We argue that gaps
between Landau levels in the range of $10-100$ Kelvin are within experimental
reach. In addition, we point out that a superlattice arising from a Moir\'e
pattern can lead to topologically non-trivial subbands. As a result, the edge
transport becomes quantized, which can be probed in multi-terminal devices made
using strained 2D crystals and/or heterostructures. The strong $d$ character of
valence and conduction bands may also allow for the investigation of the
effects of electron correlations on the topological phases.


title: Preplanetary scavengers: Growing tall in dust collisions

abstract:
  Dust collisions in protoplanetary disks are one means to grow planetesimals,
but the destructive or constructive nature of high speed collisions is still
unsettled. In laboratory experiments, we study the self-consistent evolution of
a target upon continuous impacts of submm dust aggregates at collision
velocities of up to 71m/s. Earlier studies analyzed individual collisions,
which were more speculative for high velocities and low projectile masses.
Here, we confirm earlier findings that high speed collisions result in mass
gain of the target. We also quantify the accretion efficiency for the used SiO2
(quartz) dust sample. For two different average masses of dust aggregates
(0.29g and 2.67g) accretion efficiencies are decreasing with velocity from 58%
to 18% and from 25% to 7% at 27m/s to 71m/s, respectively. The accretion
efficiency decreases approximately as logarithmic with impact energy. At the
impact velocity of 49m/s the target acquires a volume filling factor of 38%.
These data extend earlier work that pointed to the filling factor leveling off
at 8m/s to a value of 33%. Our results imply that high speed collisions are an
important mode of particle evolution. It especially allows existing large
bodies to grow further by scavenging smaller aggregates with high efficiency.


title:
Magnon breakdown in a two dimensional triangular lattice Heisenberg
  antiferromagnet of multiferroic LuMnO$_3$

abstract:
  The breakdown of magnons, the quasiparticles of magnetic systems, has rarely
been seen. By using an inelastic neutron scattering technique we report the
observation of spontaneous magnon decay in multiferroic LuMnO$_3$, a simple
two-dimensional Heisenberg triangular lattice antiferromagnet, with large spin,
S = 2. The origin of this rare phenomenon lies in the non-vanishing cubic
interaction between magnons in the spin Hamiltonian arising from the
noncollinear 120$^o$ spin structure. We observed all three key features of the
nonlinear effects as theoretically predicted: a roton-like minimum, a flat
mode, and a linewidth broadening, in our inelastic neutron scattering
measurements of single crystal LuMnO$_3$. Our results show that quasiparticles
in a system hitherto thought of as "classical" can indeed break down.


title: A model for the Balmer pseudocontinuum in spectra of type 1 AGNs

abstract:
  Here we present a new method for subtracting the Balmer pseudocontinuum in
the UV part of type 1 AGN spectra. We calculate the intensity of the Balmer
pseudocontinuum using the prominent Balmer lines in AGN spectra. We apply the
model on a sample of 293 type 1 AGNs from SDSS database, and found that our
model of Balmer pseudocontinuum + power law continuum very well fits the
majority of the AGN spectra from the sample, while in 15% of AGNs, the model
fits reasonable the UV continuum, but a discrepancy between the observed and
fitted spectra is noted. Some of the possible reasons for the discrepancy may
be a different value for the optical depth in these spectra than used in our
model or the influence of the intrinsic reddening.