title:
Results in $B_s$ physics and bottomonium spectroscopy using the Belle
  $\Upsilon({\rm 5S})$ data

abstract:
  The Belle experiment at KEK accumulated a $121.4~{\rm fb}^{-1}$ sample of
$e^+e^-$ collisions at the $\Upsilon(5S)$ resonance. This sample provides ample
opportunity for improving the understanding of both the properties of $B_s$
mesons and the spectroscopy of bottomonium states. In this article we describe
the recent results obtained from the Belle $\Upsilon(5S)$ data.


title: Wireless Computing and IT Ecosystems

abstract:
  We have evolved an IT system that is ubiquitous and pervasive and integrated
into most aspects of our lives. Many of us are working on 4th and 5th level
refinements in efficiency and functionality. But, we stand on the shoulders of
those who came before and this restricts our freedom of action. The prior work
has left us with an ecosystem which is the living embodiment of our
state-of-the-art. While we work on integration, refinement, broader application
and efficiency, the results must move seamlessly into the ecosystem.
Fundamental concepts are being researched in the lab and may rebuild the world
we all live in, until that happens, we must work within the ecosystem.


title: Strongly nonlocal dislocation dynamics in crystals

abstract:
  We consider the equation $$v_t=L_s v-W'(v)+\sigma_\epsilon(t,x) \quad {\mbox{
in }} (0,+\infty)\times\R,$$ where $L_s$ is an integro-differential operator of
order $2s$, with $s\in(0,1)$, $W$ is a periodic potential, and
$\sigma_\epsilon$ is a small external stress. The solution $v$ represents the
atomic dislocation in the Peierls--Nabarro model for crystals, and we
specifically consider the case $s\in(0,1/2)$, which takes into account a
strongly nonlocal elastic term.
  We study the evolution of such dislocation function for macroscopic space and
time scales, namely we introduce the function $$
v_{\epsilon}(t,x):=v\left(\frac{t}{\epsilon^{1+2s}},\frac{x}{\epsilon}\right).
$$ We show that, for small $\epsilon$, the function $v_\epsilon$ approaches the
sum of step functions. From the physical point of view, this shows that the
dislocations have the tendency to concentrate at single points of the crystal,
where the size of the slip coincides with the natural periodicity of the
medium. We also show that the motion of these dislocation points is governed by
an interior repulsive potential that is superposed to an elastic reaction to
the external stress.


title:
Final-state interactions in inclusive deep-inelastic scattering from the
  deuteron

abstract:
  We explore the role of final-state interactions (FSI) in inclusive
deep-inelastic scattering from the deuteron. Relating the inclusive cross
section to the deuteron forward virtual Compton scattering amplitude, a general
formula for the FSI contribution is derived in the generalized eikonal
approximation, utilizing the diffractive nature of the effective hadron-nucleon
interaction. The calculation uses a factorized model with a basis of three
resonances with mass $W<2$ GeV and a continuum contribution for larger $W$ as
the relevant set of effective hadron states entering the final-state
interaction amplitude. The results show sizeable on-shell FSI contributions for
Bjorken $x \gtrsim 0.6$ and $Q^2 \lesssim 10$ GeV$^2$, increasing in magnitude
for lower $Q^2$, but vanishing in the high-$Q^2$ limit due to phase space
constraints. The off-shell rescattering contributes at $x \gtrsim 0.8$ and is
taken as an uncertainty on the on-shell result.


title: FDR, an easier way to NNLO calculations: a two-loop case study

abstract:
  In this paper we illustrate the simplifications produced by FDR in NNLO
computations. We show with an explicit example that - due to its
four-dimensionality - FDR does not require an order-by-order renormalization
and that, unlike the one-loop case, FDR and dimensional regularization (DR)
generate intermediate two-loop results which are no longer linked by a simple
subtraction of the ultraviolet (UV) poles in epsilon. Our case study is the
two-loop amplitude for H -> gamma gamma, mediated by an infinitely heavy top
loop, in the presence of gluonic corrections. We use this to elucidate how
gauge invariance is preserved with no need of introducing counterterms in the
Lagrangian. In addition, we discuss a possible four-dimensional approach to the
infrared (IR) problem compatible with the FDR treatment of the UV infinities.


title:
Mean square estimate for relatively short exponential sums involving
  Fourier coefficients of cusp forms

abstract:
  We estimate the mean square of a short exponential sum involving Fourier
coefficients of a cusp form with a linear twist, a smooth weight function, and
a relatively short averaging interval.


title: On the necessity of a new interpretation of the stellar light curves

abstract:
  The power of asteroseismology relies on the ability to infer the stellar
structure from the unambiguous frequency identification of the corresponding
pulsation mode. Hence, the use of a Fourier transform is in the basis of
asteroseismic studies. Nevertheless, the difficulties with the interpretation
of the frequencies found in many stars lead us to reconsider whether Fourier
analysis is the most appropriate technique to identify pulsation modes. We have
found that the data, usually analyzed using Fourier techniques, present a
non-analyticity originating from the lack of connectivity of the underlying
function describing the physical phenomena. Therefore, the conditions for the
Fourier series to converge are not fulfilled. In the light of these results, we
examine in this talk some stellar light curves from different asteroseismology
space missions (CoRoT, Kepler and SoHO) in which the interpretation of the data
in terms of Fourier frequencies becomes difficult. We emphasize the necessity
of a new interpretation of the stellar light curves in order to identify the
correct frequencies of the pulsation modes.


title:
Modeling 1D structures on semiconductor surfaces: Synergy of theory and
  experiment

abstract:
  Atomic scale nanowires attract enormous interest in a wide range of fields.
On the one hand, due to their quasi-one-dimensional nature, they can act as a
experimental testbed for exotic physics: Peierls instability, charge density
waves, and Luttinger liquid behavior. On the other hand, due to their small
size, they are of interest for future device applications in the
micro-electronics industry, but also for applications regarding molecular
electronics. This versatile nature makes them interesting systems to produce
and study, but their size and growth conditions push both experimental
production and theoretical modeling to their limits. In this review, modeling
of atomic scale nanowires on semiconductor surfaces is discussed focusing on
the interplay between theory and experiment. The current state of modeling
efforts on Pt- and Au-induced nanowires on Ge(001) is presented, indicating
their similarities and differences. Recently discovered nanowire systems (Ir,
Co, Sr) on the Ge(001) surface are also touched upon. The importance of
scanning tunneling microscopy as a tool for direct comparison of theoretical
and experimental data is shown, as is the power of density functional theory as
an atomistic simulation approach. It becomes clear that complementary strengths
of theoretical and experimental investigations are required for successful
modeling of the atomistic nanowires, due to their complexity.


title:
DFT study of La$_2$Ce$_2$O$_7$: disordered fluorite vs pyrochlore
  structure

abstract:
  The crystal structure of Lanthanum Cerium Oxide (La$_2$Ce$_2$O$_7$) is
investigated using \textit{ab initio} density functional theory (DFT)
calculations. The relative stability of fluorite- and pyrochlore-like
structures is studied through comparison of their formation energies. These
formation energies show the pyrochlore structure to be favored over the
fluorite structure, apparently contradicting the conclusions based on
experimental neutron and X-ray diffraction (XRD). By calculating and comparing
XRD spectra for a set of differently ordered and random structures, we show
that the pyrochlore structure is consistent with diffraction experiments. For
these reasons, we suggest the pyrochlore structure as the ground state crystal
structure for La$_2$Ce$_2$O$_7$. %we show that among the structures considered
in this work, the pyrochlore geometry is clearly favorable over the disordered
fluorite geometry.


title:
Tuning of CeO$_2$ buffer layers for coated superconductors through
  doping

abstract:
  The appearance of microcracks in CeO$_2$ buffer layers, as used in buffer
layer architectures for coated superconductors, indicates the presence of
stress between this buffer layer and the substrate. This stress can originate
from the differences in thermal expansion or differences in lattice parameters
between the CeO$_2$ buffer layer and the substrate. In this article, we study,
by means of \textit{ab initio} density functional theory calculations, the
influence of group IV doping elements on the lattice parameter and bulk modulus
of CeO$_2$. Vegard's law behavior is found for the lattice parameter in systems
without oxygen vacancies, and the Shannon crystal radii for the doping elements
are retrieved from the lattice expansions. We show that the lattice parameter
of the doped CeO$_2$ can be matched to that of the La$_2$Zr$_2$O$_7$ coated NiW
substrate substrate for dopant concentrations of about $5\%$, and that bulk
modulus matching is either not possible or would require extreme doping
concentrations.


title: Extending Hirshfeld-I to bulk and periodic materials

abstract:
  In this work, a method is described to extend the iterative Hirshfeld-I
method, generally used for molecules, to periodic systems. The implementation
makes use of precalculated pseudo-potential based charge density distributions,
and it is shown that high quality results are obtained for both molecules and
solids, such as ceria, diamond, and graphite. The use of such grids makes the
implementation independent of the solid state or quantum chemical code used for
studying the system. The extension described here allows for easy calculation
of atomic charges and charge transfer in periodic and bulk systems.


title:
Reply to 'Comment on "Extending Hirshfeld-I to bulk and periodic
  materials" '

abstract:
  The issues raised in the comment by T.A. Manz are addressed through the
presentation of calculated atomic charges for NaF, NaCl, MgO, SrTiO$_3$ and
La$_2$Ce$_2$O$_7$, using our previously presented method for calculating
Hirshfeld-I charges in Solids [J. Comput. Chem.. doi: 10.1002/jcc.23088]. It is
shown that the use of pseudo-valence charges is sufficient to retrieve the full
all-electron Hirshfeld-I charges to good accuracy. Furthermore, we present
timing results of different systems, containing up to over $200$ atoms,
underlining the relatively low cost for large systems. A number of theoretical
issues is formulated, pointing out mainly that care must be taken when deriving
new atoms in molecules methods based on "expectations" for atomic charges.


title:
Tetravalent doping of CeO$_2$: The impact of valence electron character
  on group IV dopant influence

abstract:
  Fluorite CeO$_2$ doped with group IV elements is studied within the DFT and
DFT+U framework. Concentration dependent formation energies are calculated for
Ce$_{1-x}$Z$_x$O$_2$ (Z= C, Si, Ge, Sn, Pb, Ti, Zr, Hf) with $0\leq x \leq
0.25$ and a roughly decreasing trend with ionic radius is observed. The
influence of the valence and near valence electronic configuration is
discussed, indicating the importance of filled $d$ and $f$ shells near the
Fermi level for all properties investigated. A clearly different behavior of
group IVa and IVb dopants is observed: the former are more suitable for surface
modifications, the latter are more suitable for bulk modifications.\\ \indent
For the entire set of group IV dopants, there exists an inverse relation
between the change, due to doping, of the bulk modulus and the thermal
expansion coefficients. Hirshfeld-I atomic charges show that charge transfer
effects due to doping are limited to the nearest neighbor oxygen atoms.


title:
Aliovalent Doping of CeO$_2$: DFT-study of Oxidation State and Vacancy
  Effects

abstract:
  The modification of the properties of CeO$_2$ through aliovalent doping are
investigated within the \emph{ab-initio} density functional theory framework.
Lattice parameters, dopant atomic radii, bulk moduli and thermal expansion
coefficients of fluorite type Ce$_{1-x}$M$_{x}$O$_{2-y}$ (with M$ = $ Mg, V,
Co, Cu, Zn, Nb, Ba, La, Sm, Gd, Yb, and Bi)are presented for dopant
concentrations in the range $0.00 \leq x \leq 0.25$. The stability of the
dopants is compared and discussed, and the influence of oxygen vacancies is
investigated. It is shown that oxygen vacancies tend to increase the lattice
parameter, and strongly decrease the bulk modulus. Defect formation energies
are correlated with calculated crystal radii and covalent radii of the dopants,
but are shown to present no simple trend. The previously observed inverse
relation between the thermal expansion coefficient and the bulk modulus is
shown to persist independent of the inclusion of charge compensating vacancies.


title: Mapping Among Manifolds III

abstract:
  In two previous papers, we constructed two modified Hamiltonian formalisms to
make maps among manifolds explicit. In this paper, the two modified formalisms
were adapted to manifolds with local coordinates given by scalar fields, as in
a classical nonlinear sigma-model. The scalar field coordinates could be built
from vectors, tensors, spinors, Lagrangians, Hamiltonians, group parameters,
etc.


title: Intuitionistic Neutrosophic Soft Set

abstract:
  In this paper we study the concept of intuitionistic neutrosophic set of
Bhowmik and Pal. We have introduced this concept in soft sets and defined
intuitionistic neutrosophic soft set. Some definitions and operations have been
introduced on intuitionistic neutrosophic soft set. Some properties of this
concept have been established.


title:
Evolved Chiral NN+3N Hamiltonians for Ab Initio Nuclear Structure
  Calculations

abstract:
  We discuss the building blocks for a consistent inclusion of chiral
three-nucleon (3N) interactions into ab initio nuclear structure calculations
beyond the lower p-shell. We highlight important technical developments, such
as the similarity renormalization group (SRG) evolution in the 3N sector, a
JT-coupled storage scheme for 3N matrix elements with efficient on-the-fly
decoupling, and the importance truncated no-core shell model with 3N
interactions. Together, these developments make converged ab initio
calculations with explicit 3N interactions possible also beyond the lower
p-shell. We analyze in detail the impact of various truncations of the
SRG-evolved Hamiltonian, in particular the truncation of the
harmonic-oscillator model space used for solving the SRG flow equations and the
omission of the induced beyond-3N contributions of the evolved Hamiltonian.
Both truncations lead to sizable effects in the upper p-shell and beyond and we
present options to remedy these truncation effects. The analysis of the
different truncations is a first step towards a systematic uncertainty
quantification of all stages of the calculation.


title:
Low frequency excitations in the Coulomb Glass: numerical analysis using
  the avalanche method

abstract:
  We develop a numerical method, which allows to find pairs of metastable
states differing by transition of several electrons. We show that at low
temperature these pairs can be treated as local metastable systems that
determine low-frequency properties of Coulomb Glass with low external disorder.
The contribution of these pairs to low-frequency properties is suppressed when
the strength of the external disorder becomes comparable with interaction
between neighboring electrons.


title:
On the $\mu$-invariant of Katz $p$-adic $L$ functions attached to
  imaginary quadratic fields and applications

abstract:
  We extend to $p=2$ and $p=3$ the result of Gillard and Schneps which says
that the $\mu$-invariant of Katz $p$-adic $L$ functions attached to imaginary
quadratic fields is zero for $p>3$. The arithmetic interpretation of this fact
is given in the introduction.


title: Improving The Scalability By Contact Information Compression In Routing

abstract:
  The existence of reduced scalability and delivery leads to the development of
scalable routing by contact information compression. The previous work dealt
with the result of consistent analysis in the performance of DTN hierarchical
routing (DHR). It increases as the source to destination distance increases
with decreases in the routing performance. This paper focuses on improving the
scalability and delivery through contact information compression algorithm and
also addresses the problem of power awareness routing to increase the lifetime
of the overall network. Thus implementing the contact information compression
(CIC) algorithm the estimated shortest path (ESP) is detected dynamically. The
scalability and release are more improved during multipath multicasting, which
delivers the information to a collection of target concurrently in a single
transmission from the source


title:
On systems of interacting populations influenced by multiplicative white
  noise

abstract:
  We discuss a model of a system of interacting populations for the case when:
(i) the growth rates and the coefficients of interaction among the populations
depend on the populations densities: and (ii) the environment influences the
growth rates and this influence can be modelled by a Gaussian white noise. The
system of model equations for this case is a system of stochastic differential
equations with: (i) deterministic part in the form of polynomial
nonlinearities; and (ii) state-dependent stochastic part in the form of
multiplicative Gaussian white noise. We discuss both the cases when the formal
integration of the stochastic differential equations leads: (i) to integrals of
Ito kind; or (ii) to integrals of Stratonovich kind. The systems of stochastic
differential equations are reduced to the corresponding Fokker-Planck
equations. For the Ito case and for the case of 1 population am analytic
results is obtained for the stationary PDF of the the population density. For
the case of more than one population and for the both Ito case and Stratonovich
case the detailed balance conditions are not satisfied and because of this
exact analytic solutions of the corresponding Fokker-Plank equations for the
stationary PDFs for the population densities are not known. We obtain
approximate solutions for this case by the methodology of the adiabatic
elimination.


title: Electron Cooling in a Young Radio Supernova: SN 2012aw

abstract:
  We present the radio observations and modeling of an optically bright Type
II-P supernova (SN), SN 2012aw which exploded in the nearby galaxy Messier 95
(M95) at a distance of $10\ \rm Mpc$. The spectral index values calculated
using $C$, $X$ & $K$ bands are smaller than the expected values for optically
thin regime. During this time the optical bolometric light curve stays in the
plateau phase. We interpret the low spectral index values to be a result of
electron cooling. On the basis of comparison between Compton cooling timescale
and Synchrotron cooling timescale we find that inverse Compton cooling process
dominates over synchrotron cooling process. We therefore model the radio
emission as synchrotron emission from a relativistic electron population with a
high energy cutoff. The cutoff is determined by comparing the electron cooling
time scale $t_{cool}$ and the acceleration time scale $\tilde t_{acc}$. We
constrain the mass loss rate in the wind ($\dot M\sim 1.9\times10^{-6}\ \rm
M_{\odot}yr^{-1}$) and the equipartition factor between relativistic electrons
and the magnetic field ($\tilde \alpha=\epsilon_e/\epsilon_B\sim
1.12\times10^2$) through our modeling of radio emission. Although the time of
explosion is fairly well constrained by optical observations within about $2\
\rm days$, we explore the effect of varying the time of explosion to best fit
the radio light curves. The best fit is obtained for the explosion date as 2012
March 15.3 UT.


title:
Generation and control of spin-polarized photocurrents in GaMnAs
  heterostructures

abstract:
  Photocurrents are calculated for a specially designed GaMnAs semiconductor
heterostructure. The results reveal regions in the infrared range of the energy
spectrum in which the proposed structure is remarkably spin-selective. For such
photon energies, the generated photocurrents are strongly spin-polarized.
Application of a relatively small static bias in the growth direction of the
structure is predicted to efficiently reverse the spin-polarization for some
photon energies. This behavior suggests the possibility of conveniently simple
switching mechanisms. The physics underlying the results is studied and
understood in terms of the spin-dependent properties emerging from the
particular potential profile of the structure.


title: Multi-indexed Jacobi polynomials and Maya diagrams

abstract:
  Multi-indexed Jacobi polynomials are defined by the Wronskian of four types
of eigenfunctions of a deformed P\"oschl-Teller Hamiltonian. We give a
correspondence between multi-indexed Jacobi polynomials and pairs of Maya
diagrams, and we show that any multi-indexed Jacobi polynomial is essentially
equal to some multi-indexed Jacobi polynomial of two types of eigenfunction. As
an application, we show a Wronskian-type formula of some special eigenstates of
the deformed P\"oschl-Teller Hamiltonian.


title:
Differential poynomial rings over locally nilpotent rings need not be
  Jacobson radical

abstract:
  We answer a question by Shestakov on the Jacobson radical in differential
polynomial rings. We show that if R is a locally nilpotent ring with a
derivation D then R[X;D] need not be Jacobson radical. We also show that
J(R[X;D])\cap R is a nil ideal of R in the case where D is a locally nilpotent
derivation and R is an algebra over an uncountable field.


title:
Quark mass anomalous dimension and $\Lambda_{\overline{\textrm{MS}}}$
  from the twisted mass Dirac operator spectrum

abstract:
  We investigate whether it is possible to extract the quark mass anomalous
dimension and its scale dependence from the spectrum of the twisted mass Dirac
operator in Lattice QCD. The answer to this question appears to be positive,
provided that one goes to large enough eigenvalues, sufficiently above the
non-perturbative regime. The obtained results are compared to continuum
perturbation theory. By analyzing possible sources of systematic effects, we
find the domain of applicability of the approach, extending from an energy
scale of around 1.5 to 4 GeV. The lower limit is dictated by physics
(non-perturbative effects at low energies), while the upper bound is set by the
ultraviolet cut-off of present-day lattice simulations. The information about
the scale dependence of the anomalous dimension allows also to extract the
value of the $\Lambda_{\overline{\textrm{MS}}}$-parameter of 2-flavour QCD,
yielding the value $303(13)(25)$ MeV, where the first error is statistical and
the second one systematic. We use gauge field configuration ensembles generated
by the European Twisted Mass Collaboration (ETMC) with 2 flavours of dynamical
twisted mass quarks, at 4 lattice spacings in the range between around 0.04 and
0.08 fm.


title:
Improved design and screening of high bioactivity peptides for drug
  discovery

abstract:
  The discovery of peptides having high biological activity is very challenging
mainly because there is an enormous diversity of compounds and only a minority
have the desired properties. To lower cost and reduce the time to obtain
promising compounds, machine learning approaches can greatly assist in the
process and even replace expensive laboratory experiments by learning a
predictor with existing data. Unfortunately, selecting ligands having the
greatest predicted bioactivity requires a prohibitive amount of computational
time. For this combinatorial problem, heuristics and stochastic optimization
methods are not guaranteed to find adequate compounds.
  We propose an efficient algorithm based on De Bruijn graphs, guaranteed to
find the peptides of maximal predicted bioactivity. We demonstrate how this
algorithm can be part of an iterative combinatorial chemistry procedure to
speed up the discovery and the validation of peptide leads. Moreover, the
proposed approach does not require the use of known ligands for the target
protein since it can leverage recent multi-target machine learning predictors
where ligands for similar targets can serve as initial training data. Finally,
we validated the proposed approach in vitro with the discovery of new cationic
anti-microbial peptides.
  Source code is freely available at
http://graal.ift.ulaval.ca/peptide-design/.


title: Gibbs measures for foliated bundles with negatively curved leaves

abstract:
  In this paper we develop a notion of Gibbs measure for the geodesic flow
tangent to a foliated bundle over a compact and negatively curved basis. We
also develop a notion of $F$-harmonic measure and prove that there exists a
natural bijective correspondence between the two.
  For projective foliated bundles with $\mathbb{C}\mathbb{P}^1$-fibers without
transverse invariant measure, we show the uniqueness of these measures for any
H\"older potential on the basis. In that case we also prove that $F$-harmonic
measures are realized as weighted limits of large balls tangent to the leaves
and that their conditional measures on the fibers are limits of weighted
averages on the orbits of the holonomy group.


title: Effects of K-\bar K mixing on determining gamma from B^\pm -> DK^\pm

abstract:
  The decay $B^{\pm}\to DK^{\pm}$ followed by the subsequent decay of the $D$
meson into final states involving a neutral kaon can be used to determine the
CKM angle $\gamma$. We study CP violation effects due to mixing and decay of
the final state kaon. We find that ignoring these effects produce a shift in
$\gamma$ of order $\epsilon_{K}/r_{B}$, an enhancement of $1/r_B$ compared to
the naive expectation. We then show how to take these effects into account such
that, in principle, they will not introduce any theoretical error in the
extraction of $\gamma$.


title:
Reproducing kernel Hilbert space based estimation of systems of ordinary
  differential equations

abstract:
  Non-linear systems of differential equations have attracted the interest in
fields like system biology, ecology or biochemistry, due to their flexibility
and their ability to describe dynamical systems. Despite the importance of such
models in many branches of science they have not been the focus of systematic
statistical analysis until recently. In this work we propose a general approach
to estimate the parameters of systems of differential equations measured with
noise. Our methodology is based on the maximization of the penalized likelihood
where the system of differential equations is used as a penalty. To do so, we
use a Reproducing Kernel Hilbert Space approach that allows to formulate the
estimation problem as an unconstrained numeric maximization problem easy to
solve. The proposed method is tested with synthetically simulated data and it
is used to estimate the unobserved transcription factor CdaR in Steptomyes
coelicolor using gene expression data of the genes it regulates.


title: Absolute Frequency Measurement of Rubidium 5S-7S Two-Photon Transitions

abstract:
  We report the absolute frequency measurements of rubidium 5S-7S two-photon
transitions with a cw laser digitally locked to an atomic transition and
referenced to an optical frequency comb. The narrow, two-photon transition,
5S-7S (760 nm) insensitive to first order in a magnetic field, is a promising
candidate for frequency reference. The performed tests yield the transition
frequency with accuracy better than reported previously.


title: Heterotic-Type II duality and wrapping rules

abstract:
  We show how the brane wrapping rules, recently discovered in closed oriented
string theories compactified on tori, are extended to the case of the Type IIA
string compactified on K3. To this aim, a crucial role is played by the duality
between this theory and the Heterotic string compactified on a four-dimensional
torus T^4. We first show how the wrapping rules are applied to the T^4/Z_N
orbifold limits of K3 by relating the D0 branes, obtained as D2 branes wrapping
two-cycles, to the perturbative BPS states of the Heterotic theory on T^4. The
wrapping rules are then extended to the solitonic branes of the Type IIA
string, finding agreement with the analogous Heterotic states. Finally, the
geometric Type IIA orbifolds are mapped, via T-duality, to non-geometric Type
IIB orbifolds, where the wrapping rules are also at work and consistent with
string dualities.


title: Model Error in Data Assimilation

abstract:
  This chapter provides various perspective on an important challenge in data
assimilation: model error. While the overall goal is to understand the
implication of model error of any type in data assimilation, we emphasize on
the effect of model error from unresolved scales. In particular, connection to
related subjects under different names in applied mathematics, such as the
Mori-Zwanzig formalism and the averaging method, were discussed with the hope
that the existing methods can be more accessible and eventually be used
appropriately. We will classify existing methods into two groups: the
statistical methods for those who directly estimate the low-order model error
statistics; and the stochastic parameterizations for those who implicitly
estimate all statistics by imposing stochastic models beyond the traditional
unbiased white noise Gaussian processes. We will provide theory to justify why
stochastic parameterization, as one of the main theme in this book, is an
adequate tool for mitigating model error in data assimilation. Finally, we will
also discuss challenges in lifting this approach in general applications and
provide an alternative nonparametric approach.


title: 3-D modeling and simulation of 2G HTS stacks and coils

abstract:
  Use of 2G HTS coated conductors in several power applications has become
popular in recent years. Their large current density under high magnetic fields
makes them suitable candidates for high power capacity applications such as
stacks, coils, magnets, cables and current leads. For this reason, modeling and
simulation of their electromagnetic properties is very desirable in the design
and optimization processes. For many applications, when symmetries allow it,
simple models consisting of 1D or 2D representations are well suited for
providing a satisfying description of the problem at hand. However, certain
designs such as racetrack coils and finite-length or non-straight stacks, do
pose a 3D problem that cannot be easily reduced to a 2D configuration. Full 3-D
models have been developed, but their use for simulating superconducting
devices is a very challenging task involving a large-scale computational
problem. In this work, we present a new method to simulate the electromagnetic
transient behavior of 2G HTS stacks and coils. The method, originally used to
model stacks of straight superconducting tapes or circular coils in 2D, is now
extended to 3D. The main idea is to construct an anisotropic bulklike
equivalent for the stack or coil, such that the geometrical layout of the
internal alternating structures of insulating, metallic, superconducting and
substrate layers is reduced while keeping the overall electromagnetic behavior
of the original device. Besides the aforementioned interest in modeling and
simulating 2G HTS coated conductors, this work gives a further step towards
efficient 3D modeling and simulation of superconducting devices for large scale
applications.


title: The evolution equations for regularized Dirac-geodesics

abstract:
  We study the evolution equations for a regularized version of
Dirac-geodesics, which are the one-dimensional version of Dirac-harmonic maps.
We show that for the regularization being sufficiently large, the evolution
equations subconverge to a regularized Dirac-geodesic. In the end, we discuss
the limiting process of removing the regularization.


title: Rearrangement invariant optimal range for Hardy type operators

abstract:
  We characterize, in the context of rearrangement invariant spaces, the
optimal range space for a class of monotone operators related to the Hardy
operator. The connection between optimal range and optimal domain for these
operators is carefully analyzed.


title:
Angular momentum coefficients for meson strong decay and the unquenched
  quark model (CHARM 2013)

abstract:
  Most models for the strong decay of mesons, as well as unquenched quark
models which incorporate the effect of coupling to meson-meson channels, assume
that the coupling is driven by the creation of a quark-antiquark pair in spin
triplet. Their matrix elements can be factorised into a sum over
(model-dependent) spatial matrix elements multiplied by (model-independent)
coefficients. A general expression for these coefficients is obtained, and
their properties are studied. Numerical tables of the coefficients can be used
as a starting point for future calculations. The coefficients lead to
model-independent predictions for decay amplitudes and widths, and can explain
how mass shifts in the unquenched quark model do not spoil successful
predictions of the ordinary (quenched) quark model. This article is based on
work which will be presented in a forthcoming paper.


title:
Higher twist nucleon distribution amplitudes in Wandzura-Wilczek
  approximation

abstract:
  We derive the higher twist (four and five) nucleon distribution amplitudes in
the Wandzura-Wilczek approximation. Our method is based on an analysis of the
conformal expansion of nonlocal operators in the spinor formalism.


title: Random unitary matrices associated to a graph

abstract:
  We analyze composed quantum systems consisting of $k$ subsystems, each
described by states in the $n$-dimensional Hilbert space. Interaction between
subsystems can be represented by a graph, with vertices corresponding to
individual subsystems and edges denoting a generic interaction, modeled by
random unitary matrices of order $n^2$. The global evolution operator is
represented by a unitary matrix of size $N=n^k$. We investigate statistical
properties of such matrices and show that they display spectral properties
characteristic to Haar random unitary matrices provided the corresponding graph
is connected. Thus basing on random unitary matrices of a small size $n^2$ one
can construct a fair approximation of large random unitary matrices of size
$n^{k}$. Graph--structured random unitary matrices investigated here allow one
to define the corresponding structured ensembles of random pure states.


title: Spike timing prediction with active dendrites

abstract:
  A complete single-neuron model must correctly reproduce the firing of spikes
and bursts. We present a study of a simplified model of deep pyramidal cells of
the cortex with active dendrites. We hypothesized that we can model the soma
and its apical tuft with only two compartments, without significant loss in the
accuracy of spike-timing predictions. The model is based on experimentally
measurable impulse-response functions, which transfer the effect of current
injected in one compartment to current reaching the other. Each compartment was
modeled with a pair of non-linear differential equations and a small number of
parameters that approximate the Hodgkin-and-Huxley equations. The predictive
power of this model was tested on electrophysiological experiments where noisy
current was injected in both the soma and the apical dendrite simultaneously.
We conclude that a simple two-compartment model can predict spike times of
pyramidal cells stimulated in the soma and dendrites simultaneously. Our
results support that regenerating activity in the dendritic tuft is required to
properly account for the dynamics of layer 5 pyramidal cells under in-vivo-like
conditions.


title: A multiplicity result for the scalar field equation

abstract:
  We prove the existence of $N - 1$ distinct pairs of nontrivial solutions of
the scalar field equation in ${\mathbb R}^N$ under a slow decay condition on
the potential near infinity, without any symmetry assumptions. Our result gives
more solutions than the existing results in the literature when $N \ge 6$. When
the ground state is the only positive solution, we also obtain the stronger
result that at least $N - 1$ of the first $N$ minimax levels are critical,
i.e., we locate our solutions on particular energy levels with variational
characterizations. Finally we prove a symmetry breaking result when the
potential is radial. To overcome the difficulties arising from the lack of
compactness we use the concentration compactness principle of Lions, expressed
as a suitable profile decomposition for critical sequences.


title: Supersymmetry of hyperbolic monopoles

abstract:
  We investigate what supersymmetry says about the geometry of the moduli space
of hyperbolic monopoles. We construct a three-dimensional supersymmetric
Yang-Mills-Higgs theory on hyperbolic space whose half-BPS configurations
coincide with (complexified) hyperbolic monopoles. We then study the action of
the preserved supersymmetry on the collective coordinates and show that
demanding closure of the supersymmetry algebra constraints the geometry of the
moduli space of hyperbolic monopoles, turning it into a so-called pluricomplex
manifold, thus recovering a recent result of Bielawski and Schwachh\"ofer.


title:
Bounding the Higgs width at the LHC using full analytic results for gg
  -> 2e 2\mu

abstract:
  We revisit the hadronic production of the four-lepton final state, e^- e^+
\mu^- \mu^+, through the fusion of initial state gluons. This process is
mediated by loops of quarks and we provide first full analytic results for
helicity amplitudes that account for both the effects of the quark mass in the
loop and off-shell vector bosons. The analytic results have been implemented in
the Monte Carlo program MCFM and are both fast, and numerically stable in the
region of low Z transverse momentum. We use our results to study the
interference between Higgs-mediated and continuum production of four-lepton
final states, which is necessary in order to obtain accurate theoretical
predictions outside the Higgs resonance region. We have confirmed and extended
a recent analysis of Caola and Melnikov that proposes to use a measurement of
the off-shell region to constrain the total width of the Higgs boson. Using a
simple cut-and-count method, existing LHC data should bound the width at the
level of 25-45 times the Standard Model expectation. We investigate the power
of using a matrix element method to construct a kinematic discriminant to
sharpen the constraint. In our analysis the bound on the Higgs width is
improved by a factor of about 1.6 using a simple cut on the MEM discriminant,
compared to an invariant mass cut m_{4l} > 300 GeV.


title: A Comparison of Tram Priority at Signalized Intersections

abstract:
  We study tram priority at signalized intersections using a stochastic
cellular automaton model for multimodal traffic flow. We simulate realistic
traffic signal systems, which include signal linking and adaptive cycle lengths
and split plans, with different levels of tram priority. We find that tram
priority can improve service performance in terms of both average travel time
and travel time variability. We consider two main types of tram priority, which
we refer to as full and partial priority. Full tram priority is able to
guarantee service quality even when traffic is saturated, however, it results
in significant costs to other road users. Partial tram priority significantly
reduces tram delays while having limited impact on other traffic, and therefore
achieves a better result in terms of the overall network performance. We also
study variations in which the tram priority is only enforced when trams are
running behind schedule, and we find that those variations retain almost all of
the benefit for tram operations but with reduced negative impact on the
network.


title: Nuclear Entalpies

abstract:
  In a compressed Nuclear Matter (NM) an increasing pressure between the
nucleons starts to increase the ratio of a nucleon Fermi to average single
particle energy and in accordance with the Hugenholtz-van Hove theorem the
longitudinal Momentum Sum Rule (MSR) is broken in a Relativistic Mean Field
(RMF) approach. We propose to benefit from the concept of enthalpy in order to
show how to fulfill the MSR above a saturation density with pressure
corrections. As a result a nucleon mass can decrease with density, making the
Equation of State (EoS) softer. The course of the EoS in our modified RMF model
is close to a semi-empirical estimate and to results obtained from extensive
DBHF calculations with a Bonn A potential, which produce the EoS stiff enough
to describe neutron star properties (mass-radius constraint), especially the
most massive known neutron star. The presented model has proper saturation
properties, including good values of a compressibility and a spin-orbit term.


title:
Nonlinear Force-Free Extrapolation of the Coronal Magnetic Field Based
  on the MHD Relaxation Method

abstract:
  We develop a nonlinear force-free field (NLFFF) extrapolation code based on
the magnetohydrodynamic (MHD) relaxation method. We extend the classical MHD
relaxation method in two important ways. First, we introduce an algorithm
initially proposed by cite{2002JCoPh.175..645D} to effectively clean the
numerical errors associated with $nabla cdot vec{B}$. Second, the multi-grid
type method is implemented in our NLFFF to perform direct analysis of the
high-resolution magnetogram data. As a result of these two implementations, we
successfully extrapolated the high resolution force-free field introduced by
cite{1990ApJ...352..343L} with better accuracy in a drastically shorter time.
We also applied our extrapolation method to the MHD solution obtained from the
flux-emergence simulation by cite{2012ApJ...748...53M}. We found that NLFFF
extrapolation may be less effective for reproducing areas higher than a
half-domain, where some magnetic loops are found in a state of continuous
upward expansion. However, an inverse S shaped structure consisting of the
sheared and twisted loops formed in the lower region can be captured well
through our NLFFF extrapolation method. We further discuss how well these
sheared and twisted fields are reconstructed by estimating the magnetic
topology and twist quantitatively.


title:
Global Continuation beyond Singularities on the Boundary for a
  Degenerate Diffusive Hamilton-Jacobi Equation

abstract:
  In this article, we are interested in the Dirichlet problem for parabolic
viscous Hamilton-Jacobi Equations. It is well-known that the gradient of the
solution may blow up in finite time on the boundary of the domain, preventing a
classical extension of the solution past this singularity. This behavior comes
from the fact that one cannot prescribe the Dirichlet boundary condition for
all time and, in order to define a solution globally in time, one has to use
"generalized boundary conditions" in the sense of viscosity solution. In this
work, we treat the case when the diffusion operator is the $p$-Laplacian where
the gradient dependence in the diffusion creates specific difficulties. In this
framework, we obtain the existence and uniqueness of a continuous, global in
time, viscosity solution. For this purpose, we prove a Strong Comparison Result
between semi-continuous viscosity sub and super-solutions. Moreover, the
asymptotic behavior of $\dfrac{u(x; t)}{t}$ is analyzed through the study of
the associated ergodic problem.


title: The PHENIX Forward Silicon Vertex Detector

abstract:
  A new silicon detector has been developed to provide the PHENIX experiment
with precise charged particle tracking at forward and backward rapidity. The
Forward Silicon Vertex Tracker (FVTX) was installed in PHENIX prior to the 2012
run period of the Relativistic Heavy Ion Collider (RHIC). The FVTX is composed
of two annular endcaps, each with four stations of silicon mini-strip sensors,
covering a rapidity range of $1.2<|\eta|<2.2$ that closely matches the two
existing PHENIX muon arms. Each station consists of 48 individual silicon
sensors, each of which contains two columns of mini-strips with 75 $\mu$m pitch
in the radial direction and lengths in the $\phi$ direction varying from 3.4 mm
at the inner radius to 11.5 mm at the outer radius. The FVTX has approximately
0.54 million strips in each endcap. These are read out with FPHX chips,
developed in collaboration with Fermilab, which are wire bonded directly to the
mini-strips. The maximum strip occupancy reached in central Au-Au collisions is
approximately 2.8%. The precision tracking provided by this device makes the
identification of muons from secondary vertices away from the primary event
vertex possible. The expected distance of closest approach (DCA) resolution of
200 $\mu$m or better for particles with a transverse momentum of 5 GeV/$c$ will
allow identification of muons from relatively long-lived particles, such as $D$
and $B$ mesons, through their broader DCA distributions.


title:
The pion distribution amplitude and the pion-photon transition form
  factor in a nonlocal chiral quark model

abstract:
  We study the pion Distribution Amplitude (\pi DA) in the context of a
nonlocal chiral quark model. The corresponding Lagrangian reproduces the
phenomenological values of the pion mass and decay constant, as well as the
momentum dependence of the quark propagator obtained in lattice calculations.
It is found that the obtained \pi DA has two symmetric maxima, which arise from
the new contributions generated by the nonlocal character of the interactions.
This \pi DA is applied to leading order and next-to-leading order calculations
of the pion-photon transition form factor. Implications of the results are
discussed.


title:
Simulation-based optimization of transportation costs in high pressure
  gas grid

abstract:
  Design, architecture and deployment details of a decision support system
engineered to minimize operating costs of compressor stations in a gas network
are presented. The system employs standard simulation software for pipelines,
combined with well known optimization routine for finding optimal station
control profiles in a repetitive way. A list of custom improvements is
presented that make the system capable and robust enough to perform the
optimization tasks. Implementation process is described in detail, covering the
case of handling extra optimality criteria postulated by the user. Benefits
from using the system and lessons learned are presented in the conclusions
section.


title:
A Simple Proof of the Uniform Convergence of Fourier Series Using
  Nonstandard Analysis

abstract:
  We give a proof of the uniform convergence of Fourier series, using the
methods of nonstandard analysis.


title:
A Statistical Model of Information Evaporation of Perfectly Reflecting
  Black Holes

abstract:
  We provide a statistical communication model for the phenomenon of quantum
information evaporation from black holes. A black hole behaves as a reflecting
quantum channel in a very special regime, which allows for a receiver to
perfectly recover the absorbed quantum information. The quantum channel of a
perfectly reflecting (PR) black hole is the probabilistically weighted sum of
infinitely many qubit cloning channels. In this work, we reveal the statistical
communication background of the information evaporation process of PR black
holes. We show that the density of the cloned quantum particles in function of
the PR black hole's mass approximates a Chi-square distribution, while the
stimulated emission process is characterized by zero-mean, circular symmetric
complex Gaussian random variables. The results lead to the existence of
Rayleigh random distributed coefficients in the probability density evolution,
which confirms the presence of Rayleigh fading (a special type of random
fluctuation) in the statistical communication model of black hole information
evaporation.


title: Decomposition of quantum gates

abstract:
  A recurrence scheme is presented to decompose an $n$-qubit unitary gate to
the product of no more than $N(N-1)/2$ single qubit gates with small number of
controls, where $N = 2^n$. Detailed description of the recurrence steps and
formulas for the number of $k$-controlled single qubit gates in the
decomposition are given. Comparison of the result to a previous scheme is
presented, and future research directions are discussed.


title:
Color/kinematics duality for general abelian orbifolds of N=4 super
  Yang-Mills theory

abstract:
  To explore color/kinematics duality for general representations of the gauge
group we formulate the duality for general abelian orbifolds of the SU(N), N=4
super Yang-Mills theory in four dimensions, which have fields in the
bi-fundamental representation, and use it to construct explicitly complete
four-vector and four-scalar amplitudes at one loop. For fixed number of
supercharges, graph-organized L-loop n-point integrands of all orbifold
theories are given in terms of a fixed set of polynomials labeled by L
representations of the orbifold group. In contrast to the standard
duality-satisfying presentation of amplitudes of the N=4 super Yang-Mills
theory, each graph may appear several times with different internal states. The
color and R-charge flow provide a way to deform the amplitudes of orbifold
theories to those of more general quiver gauge theories which do not
necessarily exhibit color/kinematics duality on their own. Based on the
organization of amplitudes required by the duality between color and kinematics
in orbifold theories we show how the amplitudes of certain non-factorized
matter-coupled supergravity theories can be found through a double-copy
construction. We also carry out a comprehensive search for theories with fields
solely in the adjoint representation of the gauge group and amplitudes
exhibiting color/kinematics duality for all external states and find an
interesting relation between supersymmetry and existence of the duality.


title: Hidden scaling patterns and universality in written communication

abstract:
  The temporal statistics exhibited by written correspondence appear to be
media dependent, with features which have so far proven difficult to
characterize. We explain the origin of these difficulties by disentangling the
role of spontaneous activity from decision-based prioritizing processes in
human dynamics, clocking all waiting times through each agent's `proper time'
measured by activity. This unveils the same fundamental patterns in written
communication across all media (letters, email, sms), with response times
displaying truncated power-law behavior and average exponents near -3/2. When
standard time is used, the response time probabilities are theoretically
predicted to exhibit a bi-modal character, which is empirically borne out by
our new years-long data on email. These novel perspectives on the temporal
dynamics of human correspondence should aid in the analysis of interaction
phenomena in general, including resource management, optimal pricing and
routing, information sharing, emergency handling.


title: Coordinate Geometric Generalization of the Spherometer and Cylindrometer

abstract:
  Spherometer is an instrument widely used for measuring the radius of
curvature of a spherical surface. Cylindrometer is a modified spherometer,
which can measure the radii of both spherical and cylindrical surfaces. Both of
these instruments are based on a geometric relation unique to circles and
spheres, from Euclidean geometry. A more general understanding is obtained
using coordinate geometry. The coordinate geometric approach also enables a
generalization of the spherometer and cylindrometer to devices, which can
handle aspherical surfaces. Here, we present the newly developed coordinate
geometric approach and its applications.


title:
Anisotropic diffusive transport: connecting microscopic scattering and
  macroscopic transport properties

abstract:
  This work concerns the modeling of radiative transfer in anisotropic turbid
media using diffusion theory. A theory for the relationship between microscopic
scattering properties (i.e., an arbitrary differential scattering
cross-section) and the macroscopic diffusion tensor, in the limit of
independent scatterers, is presented. The theory is accompanied by a numerical
method capable of performing the calculations. In addition, a boundary
condition appropriate for modeling systems with anisotropic radiance is
derived. It is shown that anisotropic diffusion theory, when based on these
developments, indeed can describe radiative transfer in anisotropic turbid
media. More specifically, it is reported that solutions to the anisotropic
diffusion equation are in excellent agreement with Monte Carlo simulations,
both in steady-state and time-domain. This stands in contrast to previous work
on the topic, where inadequate boundary conditions and/or incorrect relations
between microscopic scattering properties and the diffusion tensor have caused
disagreement between simulations and diffusion theory. The present work thus
falsify previous claims that anisotropic diffusion theory cannot describe
anisotropic radiative transfer, and instead open for accurate quantitative
diffusion-based modeling of anisotropic turbid materials.


title: Quantum Kerr(Newman) degenerate stringy vacua in 4D on a non-BPS brane

abstract:
  We investigate some of the quantum gravity effects on a vacuum created pair
of $(D{\bar D})_3$-brane by a non-linear $U(1)$ gauge theory on a $D_4$-brane.
In particular we obtain a four dimensional quantum Kerr(Newman) black hole in
an effective torsion curvature formalism sourced by a two form dynamics in the
world-volume of a $D_4$-brane on $S^1$. Interestingly the event horizon is
found to be independent of a non-linear electric charge and the $4D$ quantum
black hole is shown to describe a degenerate vacua in string theory. We show
that the quantum Kerr brane universe possesses its origin in a de Sitter
vacuum. In a nearly $S_2$-symmetric limit the Kerr geometries may seen to
describe a Schwarzschild and Reissner-Nordstrom quantum black holes. It is
argued that a quantum Reissner-Nordstrom tunnels to a large class of degenerate
Schwazschild vacua. In a low energy limit the non-linear electric charge
becomes significant at the expense of the degeneracies. In the limit the
quantum geometries may identify with the semi-classical black holes established
in Einstein gravity. Analysis reveals that a quantum geometry on a vacuum
created $D_3$-brane universe may be described by a low energy perturbative
string vacuum in presence of a non-perturbative quantum correction.


title:
A Rigorous Analysis of the Clauser-Horne-Shimony-Holt Inequality
  Experiment When Trials Need Not Be Independent

abstract:
  The Clauser-Horne-Shimony-Holt (CHSH) inequality is a constraint that local
theories must obey. Quantum Mechanics predicts a violation of this inequality
in certain experimental settings. Treatments of this subject frequently make
simplifying assumptions about the probability spaces available to a local
hidden variable theory, such as assuming the state of the system is a discrete
or absolutely continuous random variable, or assuming that repeated
experimental trials are independent and identically distributed. In this paper,
we do two things: first, show that the CHSH inequality holds even for
completely general state variables in the measure-theoretic setting, and
second, demonstrate how to drop the assumption of independence of subsequent
trials while still being able to perform a hypothesis test that will
distinguish Quantum Mechanics from local theories. The statistical strength of
such a test is computed.


title: Guided proposals for simulating multi-dimensional diffusion bridges

abstract:
  A Monte Carlo method for simulating a multi-dimensional diffusion process
conditioned on hitting a fixed point at a fixed future time is developed.
Proposals for such diffusion bridges are obtained by superimposing an
additional guiding term to the drift of the process under consideration. The
guiding term is derived via approximation of the target process by a simpler
diffusion processes with known transition densities. Acceptance of a proposal
can be determined by computing the likelihood ratio between the proposal and
the target bridge, which is derived in closed form. We show under general
conditions that the likelihood ratio is well defined and show that a class of
proposals with guiding term obtained from linear approximations fall under
these conditions.


title: Advancements on SEFE and Partitioned Book Embedding Problems

abstract:
  In this work we investigate the complexity of some problems related to the
{\em Simultaneous Embedding with Fixed Edges} (SEFE) of $k$ planar graphs and
the PARTITIONED $k$-PAGE BOOK EMBEDDING (PBE-$k$) problems, which are known to
be equivalent under certain conditions.
  While the computational complexity of SEFE for $k=2$ is still a central open
question in Graph Drawing, the problem is NP-complete for $k \geq 3$ [Gassner
{\em et al.}, WG '06], even if the intersection graph is the same for each pair
of graphs ({\em sunflower intersection}) [Schaefer, JGAA (2013)].
  We improve on these results by proving that SEFE with $k \geq 3$ and
sunflower intersection is NP-complete even when the intersection graph is a
tree and all the input graphs are biconnected. Also, we prove NP-completeness
for $k \geq 3$ of problem PBE-$k$ and of problem PARTITIONED T-COHERENT
$k$-PAGE BOOK EMBEDDING (PTBE-$k$) - that is the generalization of PBE-$k$ in
which the ordering of the vertices on the spine is constrained by a tree $T$ -
even when two input graphs are biconnected. Further, we provide a linear-time
algorithm for PTBE-$k$ when $k-1$ pages are assigned a connected graph.
Finally, we prove that the problem of maximizing the number of edges that are
drawn the same in a SEFE of two graphs is NP-complete in several restricted
settings ({\em optimization version of SEFE}, Open Problem $9$, Chapter $11$ of
the Handbook of Graph Drawing and Visualization).


title: Mechanically Modulated Tunneling Resistance in Monolayer MoS2

abstract:
  We report on the modulation of tunneling resistance in MoS2 monolayers by
nano-indentation using an atomic force microscope (AFM). The resistance between
the conductive AFM tip and the bottom electrode separated by a monolayer MoS2
is reversibly reduced by up to 4 orders of magnitude, which is attributed to
enhanced quantum tunneling when the monolayer is compressed by the tip force.
Under the WKB approximation, the experimental data is quantitatively explained
by using the metal-insulator-metal tunneling diode model. As an ideal tunneling
medium, the defect-free, nanometer-thick MoS2 monolayer can serve as the active
layer for non-impacting nano-electro-mechanical switches.


title: The search for strongly decaying exotic matter

abstract:
  In this paper we explore the possibility of detecting strongly decaying
exotic states. The dibaryon(2.15) $J^P$ = $2^+$ state which decays into d $\pi$
is the example we use in this report.


title:
Entanglement, Flow and Classical Simulatability in Measurement Based
  Quantum Computation

abstract:
  The question of which and how a particular class of entangled resource states
(known as graph states) can be used for measurement based quantum computation
(MBQC) recently gave rise to the notion of Flow and its generalisation gFlow.
That is a causal structure for measurements guaranteeing deterministic
computation. Furthermore, gFlow has proven itself to be a powerful tool in
studying the difference between the measurement-based and circuit models for
quantum computing, as well as analysing cryptographic protocols. On the other
hand, entanglement is known to play a crucial role in MBQC. In this paper we
first show how gFlow can be used to directly give a bound on the classical
simulation of an MBQC. Our method offers an interpretation of the gFlow as
showing how information flows through a computation, giving rise to an
information light cone. We then establish a link between entanglement and the
existence of gFlow for a graph state. We show that the gFlow can be used to
bound the entanglement width and what we call the \emph{structural
entanglement} of a graph state. In turn this gives another method relating the
gFlow to bounds on how efficiently a computation can be simulated classically.
These two methods of getting bounds on the difficulty of classical simulation
are different and complementary and several known results follow. In particular
known relations between the MBQC and the circuit model allow these results to
be translated across models.


title: Models and Simulations in Material Science: Two Cases Without Error Bars

abstract:
  We discuss two research projects in material science in which the results
cannot be stated with an estimation of the error: a spectro- scopic
ellipsometry study aimed at determining the orientation of DNA molecules on
diamond and a scanning tunneling microscopy study of platinum-induced nanowires
on germanium. To investigate the reliability of the results, we apply ideas
from the philosophy of models in science. Even if the studies had reported an
error value, the trustworthiness of the result would not depend on that value
alone.


title:
Dynamics of entanglement entropy and entanglement spectrum crossing a
  quantum phase transition

abstract:
  We study the time evolution of entanglement entropy and entanglement spectrum
in a finite-size system which crosses a quantum phase transition at different
speeds. We focus on the Ising model with a time-dependent magnetic field, which
is linearly tuned on a time scale $\tau$ . The time evolution of the
entanglement entropy displays different regimes depending on the value of
$\tau$, showing also oscillations which depend on the instantaneous energy
spectrum. The entanglement spectrum is characterized by a rich dynamics where
multiple crossings take place with a gap-dependent frequency. Moreover, we
investigate the Kibble-Zurek scaling of entanglement entropy and Schmidt gap.


title: A Bayesian approach to sparse channel estimation in OFDM systems

abstract:
  In this work, we address the problem of estimating sparse communication
channels in OFDM systems in the presence of carrier frequency offset (CFO) and
unknown noise variance. To this end, we consider a convex optimization problem,
including a probability function, accounting for the sparse nature of the
communication channel. We use the Expectation-Maximization (EM) algorithm to
solve the corresponding Maximum A Posteriori (MAP) estimation problem. We show
that, by concentrating the cost function in one variable, namely the CFO, the
channel estimate can be obtained in closed form within the EM framework in the
maximization step. We present an example where we estimate the communication
channel, the CFO, the symbol, the noise variance, and the parameter defining
the prior distribution of the estimates. We compare the bit error rate
performance of our proposed MAP approach against Maximum Likelihood.


title: Pulsation analysis and its impact on primary transit modeling in WASP-33

abstract:
  To date, WASP-33 is the only delta Scuti star known to be orbited by a hot
Jupiter. The pronounced stellar pulsations, showing periods comparable to the
primary transit duration, interfere with the transit modeling. Therefore our
main goal is to study the pulsation spectrum of the host star to redetermine
the orbital parameters of the system by means of pulsation-cleaned primary
transit light curves. Between August 2010 and October 2012 we obtained 457
hours of photometry of WASP-33 using small and middle-class telescopes located
mostly in Spain and in Germany. Our observations comprise the wavelength range
between the blue and the red, and provide full phase coverage of the planetary
orbit. After a careful detrend, we focus our pulsation studies in the high
frequency regime, where the pulsations that mostly deform the primary transit
exist. The data allow us to identify, for the first time in the system, eight
significant pulsation frequencies. The pulsations are likely associated with
low-order p-modes. Furthermore, we find that pulsation phases evolve in time.
We use our knowledge of the pulsations to clean the primary transit light
curves and carry out an improved transit modeling. Surprisingly, taking into
account the pulsations in the modeling has little influence on the derived
orbital parameters. However, the uncertainties in the best-fit parameters
decrease. Additionally, we find indications for a possible dependence between
wavelength and transit depth, but only with marginal significance. A clear
pulsation solution, in combination with an accurate orbital period, allows us
to extend our studies and search for star-planet interactions (SPI). Although
we find no conclusive evidence of SPI, we believe that the pulsation nature of
the host star and the proximity between members make WASP-33 a promising system
for further SPI studies.


title: Electron-hole spin flip-flop in semiconductor quantum dots

abstract:
  We use temporally resolved intensity cross-correlation measurements to
identify the biexciton-exciton radiative cascades in a negatively charged QD.
The polarization sensitive correlation measurements show unambiguously that the
excited two electron triplet states relax non-radiatively to their singlet
ground state via a spin non conserving flip-flop with the ground state heavy
hole. We explain this mechanism in terms of resonant coupling between the
confined electron states and an LO phonon. This resonant interaction together
with the electron-hole exchange interaction provides an efficient mechanism for
this, otherwise spin-blockaded, electronic relaxation.


title: Branching random walks and contact processes on Galton-Watson trees

abstract:
  We consider branching random walks and contact processes on infinite,
connected, locally finite graphs whose reproduction and infectivity rates
across edges are inversely proportional to vertex degree. We show that when the
ambient graph is a Galton-Watson tree then, in certain circumstances, the
branching random walks and contact processes will have weak survival phases. We
also provide bounds on critical values.


title: Is it possible to detect planets around young active G and K dwarfs?

abstract:
  Theoretical predictions suggest that the distribution of planets in very
young stars could be very different to that typically observed in Gyr old
systems that are the current focus of radial velocity surveys. However, the
detection of planets around young stars is hampered by the increased stellar
activity associated with young stars, the signatures of which can bias the
detection of planets. In this paper we place realistic limitations on the
possibilities for detecting planets around young active G and K dwarfs. The
models of stellar activity based on tomographic imaging of the G dwarf HD
141943 and the K1 dwarf AB Dor and also include contributions from plage and
many small random starspots. Our results show that the increased stellar
activity levels present on young Solar-type stars strongly impacts the
detection of Earth-mass and Jupiter mass planets and that the degree of
activity jitter is directly correlated with stellar \vsinis. We also show that
for G and K dwarfs, the distribution of activity in individual stars is more
important than the differences in induced radial velocities as a function of
spectral type. We conclude that Jupiter mass planets can be detected close-in
around fast-rotating young active stars, Neptune-mass planets around moderate
rotators and that Super-Earths are only detectable around very slowly rotating
stars. The effects of an increase in stellar activity jitter by observing
younger stars can be compensated for by extending the observational base-line
to at least 100 epochs.


title: Describing Textures in the Wild

abstract:
  Patterns and textures are defining characteristics of many natural objects: a
shirt can be striped, the wings of a butterfly can be veined, and the skin of
an animal can be scaly. Aiming at supporting this analytical dimension in image
understanding, we address the challenging problem of describing textures with
semantic attributes. We identify a rich vocabulary of forty-seven texture terms
and use them to describe a large dataset of patterns collected in the wild.The
resulting Describable Textures Dataset (DTD) is the basis to seek for the best
texture representation for recognizing describable texture attributes in
images. We port from object recognition to texture recognition the Improved
Fisher Vector (IFV) and show that, surprisingly, it outperforms specialized
texture descriptors not only on our problem, but also in established material
recognition datasets. We also show that the describable attributes are
excellent texture descriptors, transferring between datasets and tasks; in
particular, combined with IFV, they significantly outperform the
state-of-the-art by more than 8 percent on both FMD and KTHTIPS-2b benchmarks.
We also demonstrate that they produce intuitive descriptions of materials and
Internet images.


title: Generalized Harnack's inequality for nonhomogeneous elliptic equations

abstract:
  This paper is concerned with nonlinear elliptic equations in nondivergence
form where the operator has a first order drift term which is not Lipschitz
continuous. Under this condition the equations are nonhomogeneous and
nonnegative solutions do not satisfy the classical Harnack's inequality. This
paper presents a new type of generalization of the classical Harnack's
inequality for such equations. As a corollary we obtain the optimal Harnack
type of estimate for p(x)-harmonic functions which quantifies the strong
minimum principle.


title:
Ergodic and Mixing Properties of the Boussinesq Equations with a
  Degenerate Random Forcing

abstract:
  We establish the existence, uniqueness and attraction properties of an
ergodic invariant measure for the Boussinesq Equations in the presence of a
degenerate stochastic forcing acting only in the temperature equation and only
at the largest spatial scales. The central challenge is to establish time
asymptotic smoothing properties of the Markovian dynamics corresponding to this
system. Towards this aim we encounter a Lie bracket structure in the associated
vector fields with a complicated dependence on solutions. This leads us to
develop a novel H\"{o}rmander-type condition for infinite-dimensional systems.
Demonstrating the sufficiency of this condition requires new techniques for the
spectral analysis of the Malliavin covariance matrix.


title: NLO merging in tt+jets

abstract:
  In this talk the application of the recently introduced methods to merge NLO
calculations of successive jet multiplicities to the production of top pairs in
association with jets will be discussed, in particular a fresh look is taken at
the top quark forward-backward asymmetries. Emphasis will be put on the
achieved theoretical accuracy and the associated perturbative and
non-perturbative error estimates.


title:
Introduction of interactive learning into French university physics
  classrooms

abstract:
  We report on a project to introduce interactive learning strategies (ILS) to
physics classes at the Universit\'e Pierre et Marie Curie (UPMC), one of the
leading science universities in France. In Spring 2012, instructors in two
large introductory classes, first-year, second-semester mechanics, and
second-year introductory E&M, enrolling approximately 500 and 250 students
respectively, introduced ILS into some sections of each class. The specific ILS
utilized were Think-Pair-Share questions and Peer Instruction in the main
lecture classrooms, and UW Tutorials for Introductory Physics in recitation
sections. Pre- and post-instruction assessments (FCI and CSEM respectively)
were given, along with a series of demographics questions. We were able to
compare the results of the FCI and CSEM between interactive and non-interactive
classes taught simultaneously with the same curriculum. We also analyzed final
exam results, as well as the results of student and instructor attitude surveys
between classes. In our analysis, we argue that Multiple Linear Regression
modeling is superior to other common analysis tools, including normalized gain.
Our results show that ILS are effective at improving student learning by all
measures used: research-validated concept inventories and final exam scores, on
both conceptual and traditional problem-solving questions. Multiple Linear
Regression analysis reveals that interactivity in the classroom is a
significant predictor of student learning, showing a similar or stronger
relationship with student learning than such ascribed characteristics as
parents' education, and achieved characteristics such as GPA and hours studied
per week. Analysis of student and instructors attitudes shows that both groups
believe that ILS improve student learning in the physics classroom, and
increases student engagement and motivation.


title: On the Adaptivity Gap of Stochastic Orienteering

abstract:
  The input to the stochastic orienteering problem consists of a budget $B$ and
metric $(V,d)$ where each vertex $v$ has a job with deterministic reward and
random processing time (drawn from a known distribution). The processing times
are independent across vertices. The goal is to obtain a non-anticipatory
policy to run jobs at different vertices, that maximizes expected reward,
subject to the total distance traveled plus processing times being at most $B$.
An adaptive policy is one that can choose the next vertex to visit based on
observed random instantiations. Whereas, a non-adaptive policy is just given by
a fixed ordering of vertices. The adaptivity gap is the worst-case ratio of the
expected rewards of the optimal adaptive and non-adaptive policies.
  We prove an $\Omega(\log\log B)^{1/2}$ lower bound on the adaptivity gap of
stochastic orienteering. This provides a negative answer to the $O(1)$
adaptivity gap conjectured earlier, and comes close to the $O(\log\log B)$
upper bound. This result holds even on a line metric.
  We also show an $O(\log\log B)$ upper bound on the adaptivity gap for the
correlated stochastic orienteering problem, where the reward of each job is
random and possibly correlated to its processing time. Using this, we obtain an
improved quasi-polynomial time approximation algorithm for correlated
stochastic orienteering.


title: Parabolic refined invariants and Macdonald polynomials

abstract:
  A string theoretic derivation is given for the conjecture of Hausel,
Letellier, and Rodriguez-Villegas on the cohomology of character varieties with
marked points. Their formula is identified with a refined BPS expansion in the
stable pair theory of a local root stack, generalizing previous work of the
first two authors in collaboration with G. Pan. Haiman's geometric construction
for Macdonald polynomials is shown to emerge naturally in this context via
geometric engineering. In particular this yields a new conjectural relation
between Macdonald polynomials and refined local orbifold curve counting
invariants. The string theoretic approach also leads to a new spectral cover
construction for parabolic Higgs bundles in terms of holomorphic symplectic
orbifolds.


title: Nondestructive Detection of an Optical Photon

abstract:
  All optical detectors to date annihilate photons upon detection, thus
excluding repeated measurements. Here, we demonstrate a robust photon detection
scheme which does not rely on absorption. Instead, an incoming photon is
reflected off an optical resonator containing a single atom prepared in a
superposition of two states. The reflection toggles the superposition phase
which is then measured to trace the photon. Characterizing the device with
faint laser pulses, a single-photon detection efficiency of 74% and a survival
probability of 66% is achieved. The efficiency can be further increased by
observing the photon repeatedly. The large single-photon nonlinearity of the
experiment should enable the development of photonic quantum gates and the
preparation of novel quantum states of light.


title: Verification and Validation Issues in Systems of Systems

abstract:
  The cutting edge in systems development today is in the area of "systems of
systems" (SoS) large networks of inter-related systems that are developed and
managed separately, but that also perform collective activities. Such large
systems typically involve constituent systems operating with different life
cycles, often with uncoordinated evolution. The result is an ever-changing SoS
in which adaptation and evolution replace the older engineering paradigm of
"development". This short paper presents key thoughts about verification and
validation in this environment. Classic verification and validation methods
rely on having (a) a basis of proof, in requirements and in operational
scenarios, and (b) a known system configuration to be proven. However, with
constant SoS evolution, management of both requirements and system
configurations are problematic. Often, it is impossible to maintain a valid set
of requirements for the SoS due to the ongoing changes in the constituent
systems. Frequently, it is even difficult to maintain a vision of the SoS
operational use as users find new ways to adapt the SoS. These features of the
SoS result in significant challenges for system proof. In addition to
discussing the issues, the paper also indicates some of the solutions that are
currently used to prove the SoS.


title: Variability and Evolution in Systems of Systems

abstract:
  In this position paper (1) we discuss two particular aspects of Systems of
Systems, i.e., variability and evolution. (2) We argue that concepts from
Product Line Engineering and Software Evolution are relevant to Systems of
Systems Engineering. (3) Conversely, concepts from Systems of Systems
Engineering can be helpful in Product Line Engineering and Software Evolution.
Hence, we argue that an exchange of concepts between the disciplines would be
beneficial.


title:
Systems of Systems Modeled by a Hierarchical Part-Whole State-Based
  Formalism

abstract:
  The paper presents an explicit state-based modeling approach aimed at
modeling Systems of Systems behavior. The approach allows to specify and verify
incrementally safety and liveness rules without using model checking
techniques. The state-based approach allows moreover to use the system behavior
directly as an interface, greatly improving the effectiveness of the recursive
composition needed when assembling Systems of Systems. Such systems are, at the
same time, both parts and wholes, thus giving a formal characterization to the
notion of Holon.


title: System-of-Systems Complexity

abstract:
  The global availability of communication services makes it possible to
interconnect independently developed systems, called constituent systems, to
provide new synergistic services and more efficient economic processes. The
characteristics of these new Systems-of-Systems are qualitatively different
from the classic monolithic systems. In the first part of this presentation we
elaborate on these differences, particularly with respect to the autonomy of
the constituent systems, to dependability, continuous evolution, and emergence.
In the second part we look at a SoS from the point of view of cognitive
complexity. Cognitive complexity is seen as a relation between a model of an
SoS and the observer. In order to understand the behavior of a large SoS we
have to generate models of adequate simplicity, i.e, of a cognitive complexity
that can be handled by the limited capabilities of the human mind. We will
discuss the importance of properly specifying and placing the relied-upon
message interfaces between the constituent systems that form an open SoS and
discuss simplification strategies that help to reduce the cognitive complexity.


title:
Challenges for modelling and analysis in embedded systems and
  systems-of-systems design

abstract:
  Over the last decade we have witnessed an increasing use of data processing
in embedded systems. Where in the past the data processing was limited (if
present at all) to the handling of a small number of "on-off control signals",
more recently much more complex sensory data is being captured, processed and
used to improve system performance and dependability. The advent of
systems-of-systems aggravates the use of more and more data, for instance, by
bringing together data from several independent sources, allowing, in
principle, for even better performing systems. However, this ever stronger
data-orientation brings along several challenges in system design, both
technically and organisationally, and also forces manufacturers to think beyond
their traditional field of expertise. In this short paper, I will address these
new design challenges, through a number of examples. The paper finishes with
concrete challenges for supporting tools and techniques for system design in
this new context.


title: Contracts and Behavioral Patterns for SoS: The EU IP DANSE approach

abstract:
  This paper presents some of the results of the first year of DANSE, one of
the first EU IP projects dedicated to SoS. Concretely, we offer a tool chain
that allows to specify SoS and SoS requirements at high level, and analyse them
using powerful toolsets coming from the formal verification area. At the high
level, we use UPDM, the system model provided by the british army as well as a
new type of contract based on behavioral patterns. At low level, we rely on a
powerful simulation toolset combined with recent advances from the area of
statistical model checking. The approach has been applied to a case study
developed at EADS Innovation Works.


title: SoS contract verification using statistical model checking

abstract:
  Exhaustive formal verification for systems of systems (SoS) is impractical
and cannot be applied on a large scale. In this paper we propose to use
statistical model checking for efficient verification of SoS. We address three
relevant aspects for systems of systems: 1) the model of the SoS, which
includes stochastic aspects; 2) the formalization of the SoS requirements in
the form of contracts; 3) the tool-chain to support statistical model checking
for SoS. We adapt the SMC technique for application to heterogeneous SoS. We
extend the UPDM/SysML specification language to express the SoS requirements
that the implemented strategies over the SoS must satisfy. The requirements are
specified with a new contract language specifically designed for SoS, targeting
a high-level English- pattern language, but relying on an accurate semantics
given by the standard temporal logics. The contracts are verified against the
UPDM/SysML specification using the Statistical Model Checker (SMC) PLASMA
combined with the simulation engine DESYRE, which integrates heterogeneous
behavioral models through the functional mock-up interface (FMI) standard. The
tool-chain allows computing an estimation of the satisfiability of the
contracts by the SoS. The results help the system architect to trade-off
different solutions to guide the evolution of the SoS.


title: A coordination model for ultra-large scale systems of systems

abstract:
  The ultra large multi-agent systems are becoming increasingly popular due to
quick decay of the individual production costs and the potential of speeding up
the solving of complex problems. Examples include nano-robots, or systems of
nano-satellites for dangerous meteorite detection, or cultures of stem cells
for organ regeneration or nerve repair. The topics associated with these
systems are usually dealt within the theories of intelligent swarms or
biologically inspired computation systems. Stochastic models play an important
role and they are based on various formulations of the mechanical statistics.
In these cases, the main assumption is that the swarm elements have a simple
behaviour and that some average properties can be deduced for the entire swarm.
In contrast, complex systems in areas like aeronautics are formed by elements
with sophisticated behaviour, which are even autonomous. In situations like
this, a new approach to swarm coordination is necessary. We present a
stochastic model where the swarm elements are communicating autonomous systems,
the coordination is separated from the component autonomous activity and the
entire swarm can be abstracted away as a piecewise deterministic Markov
process, which constitutes one of the most popular model in stochastic control.
Keywords: ultra large multi-agent systems, system of systems, autonomous
systems, stochastic hybrid systems.


title: Merging of matrix elements and parton showers at NLO accuracy

abstract:
  The merging of matrix elements and parton showers is an established
calculational tool for the description of multi-jet final states at hadron
colliders. These methods have recently been promoted to next-to-leading order
accuracy in the description of hard well separated jets.
  This talk introduces such a method and discusses its application to
phenomenologically relevant signal and background processes. The systematic
assessment of its theoretical uncertainty is a prime focus.


title: Do You Always Need a Textbook to Teach Astro 101?

abstract:
  The increasing use of interactive learning strategies in Astro 101 classrooms
has led some instructors to consider the usefulness of a textbook in such
classes. These strategies provide students a learning modality very different
from the traditional lecture supplemented by reading a textbook and homework,
and raises the question of whether the learning that takes place during such
interactive activities is enough by itself to teach students what we wish them
to know about astronomy. To address this question, assessment data is presented
from an interactive class, which was first taught with a required textbook, and
then with the textbook being optional. Comparison of test scores before and
after this change shows no statistical difference in student achievement
whether a textbook is required or not. In addition, comparison of test scores
of students who purchased the textbook to those who did not, after the textbook
became optional, also show no statistical difference between the two groups.
The Light and Spectroscopy Concept Inventory (LSCI), a research-validated
assessment tool, was given pre- and post-instruction to three classes that had
a required textbook, and one for which the textbook was optional, and the
results demonstrate that the student learning gains on this central topic were
statistically indistinguishable between the two groups. Finally, the Star
Properties Concept Inventory (SPCI), another research-validated assessment
tool, was administered to a class for which the textbook was optional, and the
class performance was higher than that of a group of classes in a national
study.


title:
Multiplicity distributions in p+p, p+A and A+A collisions from
  Yang-Mills dynamics

abstract:
  We compute transverse momentum and momentum integrated multiplicity
distributions consistently in the IP-Glasma model for proton-proton and
proton-lead collisions at the LHC, in deuteron-gold collisions at RHIC, and in
heavy ion collisions at both RHIC and LHC energies. Several sources of
sub-nucleon scale contributions to the multiplicity distributions are
identified. Our results, which are constrained by inclusive and diffractive
deeply inelastic scattering data from HERA, are compared to measured
distributions for a range of collision energies. These results are an essential
first step in quantifying the relative role of initial and final state effects
on multiparticle correlations in light and heavy ion collisions.


title: MAGIC upper limits on the GRB 090102 afterglow

abstract:
  Indications of a GeV component in the emission from GRBs are known since the
EGRET observations during the 1990's and they have been confirmed by the data
of the Fermi satellite. These results have, however, shown that our
understanding of GRB physics is still unsatisfactory. The new generation of
Cherenkov observatories and in particular the MAGIC telescope, allow for the
first time the possibility to extend the measurement of GRBs from several tens
up to hundreds of GeV energy range. Both leptonic and hadronic processes have
been suggested to explain the possible GeV/TeV counterpart of GRBs.
Observations with ground-based telescopes of very high energy photons (E>30
GeV) from these sources are going to play a key role in discriminating among
the different proposed emission mechanisms, which are barely distinguishable at
lower energies. MAGIC telescope observations of the GRB 090102 (z=1.547) field
and Fermi Large Area Telescope (LAT) data in the same time interval are
analysed to derive upper limits of the GeV/TeV emission. We compare these
results to the expected emissions evaluated for different processes in the
framework of a relativistic blast wave model for the afterglow. Simultaneous
upper limits with Fermi and a Cherenkov telescope have been derived for this
GRB observation. The results we obtained are compatible with the expected
emission although the difficulties in predicting the HE and VHE emission for
the afterglow of this event makes it difficult to draw firmer conclusions.
Nonetheless, MAGIC sensitivity in the energy range of overlap with space-based
instruments (above about 40 GeV) is about one order of magnitude better with
respect to Fermi. This makes evident the constraining power of ground-based
observations and shows that the MAGIC telescope has reached the required
performance to make possible GRB multiwavelength studies in the very high
energy range.


title:
Analyses and performance of techniques PAPR reduction for STBC MIMO-OFDM
  system in (4G) wireless communication

abstract:
  An OFDM system is combined with multiple-input multiple-output (MIMO) in
order to increase the diversity gain and system capacity over the time variant
frequency-selective channels. However, a major drawback of MIMO-OFDM system is
that the transmitted signals on different antennas might exhibit high
peak-to-average power ratio (PAPR).In this paper, we present a PAPR analysis
reduction of space-timeblock-coded (STBC) MIMO-OFDM system for 4G
wirelessnetworks. Several techniques have been used to reduce the PAPR of the
(STBC) MIMOOFDM system: clipping and filtering, partial transmit sequence (PTS)
and selected mapping (SLM). Simulation results show that clipping and filtering
provides a better PAPR reduction than the others methods and only SLM technique
conserve the PAPR reduction in reception part of signal.


title: Dynamical evolution of star forming regions

abstract:
  We model the dynamical evolution of star forming regions with a wide range of
initial properties. We follow the evolution of the regions' substructure using
the Q-parameter, we search for dynamical mass segregation using the Lambda_MSR
technique, and we also quantify the evolution of local density around stars as
a function of mass using the Sigma_LDR method.
  The amount of dynamical mass segregation measured by Lambda_MSR is generally
only significant for subvirial and virialised, substructured regions - which
usually evolve to form bound clusters. The Sigma_LDR method shows that massive
stars attain higher local densities than the median value in all regions, even
those that are supervirial and evolve to form (unbound) associations.
  We also introduce the Q-Sigma_LDR plot, which describes the evolution of
spatial structure as a function of mass-weighted local density in a star
forming region. Initially dense (>1000 stars pc^{-2}), bound regions always
have Q >1, Sigma_LDR > 2 after 5Myr, whereas dense unbound regions always have
Q < 1, Sigma_LDR > 2 after 5Myr. Less dense regions (<100 stars pc^{-2}) do not
usually exhibit Sigma_LDR > 2 values, and if relatively high local density
around massive stars arises purely from dynamics, then the Q-Sigma_LDR plot can
be used to estimate the initial density of a star forming region.


title: A 9/7-Approximation Algorithm for Graphic TSP in Cubic Bipartite Graphs

abstract:
  We prove new results for approximating Graphic TSP. Specifically, we provide
a polynomial-time \frac{9}{7}-approximation algorithm for cubic bipartite
graphs and a (\frac{9}{7}+\frac{1}{21(k-2)})-approximation algorithm for
k-regular bipartite graphs, both of which are improved approximation factors
compared to previous results. Our approach involves finding a cycle cover with
relatively few cycles, which we are able to do by leveraging the fact that all
cycles in bipartite graphs are of even length along with our knowledge of the
structure of cubic graphs.


title:
Singularities of Functions on the Martinet Plane, Constrained
  Hamiltonian Systems and Singular Lagrangians

abstract:
  We consider here the analytic classification of pairs $(\omega,f)$ where
$\omega$ is a germ of a 2-form on the plane and $f$ is a quasihomogeneous
function germ with isolated singularities. We consider only the case where
$\omega$ is singular, i.e. it vanishes non-degenerately along a smooth line
$H(\omega)$ (Martinet case) and the function $f$ is such that the pair
$(f,H(\omega))$ defines an isolated boundary singularity. In analogy with the
ordinary case (for symplectic forms on the plane) we show that the moduli in
the classification problem are analytic functions of 1-variable and that their
number is exactly equal to the Milnor number of the corresponding boundary
singularity. Moreover we derive a normal form for the pair $(\omega,f)$
involving exactly these functional invariants. Finally we give an application
of the results in the theory of constrained Hamiltonian systems, related to the
motion of charged particles in the quantisation limit in an electromagnetic
field, which in turn leads to a list of normal forms of generic singular
Lagrangians (of first order in the velocities) on the plane.


title: Cahn-Hilliard Equation with Nonlocal Singular Free Energies

abstract:
  We consider a Cahn-Hilliard equation which is the conserved gradient flow of
a nonlocal total free energy functional. This functional is characterized by a
Helmholtz free energy density, which can be of logarithmic type. Moreover, the
spatial interactions between the different phases are modeled by a singular
kernel. As a consequence, the chemical potential $\mu$ contains an integral
operator acting on the concentration difference $c$, instead of the usual
Laplace operator. We analyze the equation on a bounded domain subject to
no-flux boundary condition for $\mu$ and by assuming constant mobility. We
first establish the existence and uniqueness of a weak solution and some
regularity properties. These results allow us to define a dissipative dynamical
system on a suitable phase-space and we prove that such a system has a
(connected) global attractor. Finally, we show that a Neumann-like boundary
condition can be recovered for $c$, provided that it is supposed to be regular
enough.


title: Spectral densities from the lattice

abstract:
  We discuss a method to extract the K\"all\'{e}n-Lehmann spectral density of a
particle (be it elementary or bound state) propagator by means of 4d lattice
data. We employ a linear regularization strategy, commonly known as the
Tikhonov method with Morozov discrepancy principle. An important virtue over
the popular maximum entropy method is the possibility to also probe unphysical
spectral densities, as, for example, of a confined gluon. We apply our proposal
to the SU(3) glue sector.


title: Inversion and subspaces of a finite field

abstract:
  Let $A$ and $B$ two $F_q$-subspaces of a finite field, of the same size, and
let $A^{-1}$ denote the set of inverses of the nonzero elements of $A$.
Mattarei proved that $A^{-1}$ can only be contained in $A$ if either $A$ is a
subfield, or $A$ is the set of trace zero elements in a quadratic extension of
a field. Csajb\'{o}k refined this to the following quantitative statement: if
$A^{-1}\not\subseteq B$, then the bound $|A^{-1}\cap B|\le 2|B|/q-2$ holds. He
also gave examples showing that his bound is sharp for $|B|\le q^3$. Our main
result is a proof of the stronger bound $|A^{-1}\cap B|\le
|B|/q\cdot\bigl(1+O_d(q^{-1/2})\bigr)$, for $|B|=q^d$ with $d>3$. We also
classify all examples with $|B|\le q^3$ which attain equality in Csajb\'{o}k's
bound.


title:
Multi-Epoch High-Spectral-Resolution Observations of Neutral Sodium in
  14 Type Ia Supernovae

abstract:
  One of the main questions concerning Type Ia supernovae is the nature of the
binary companion of the exploding white dwarf. A major discriminant between
different suggested models is the presence and physical properties of
circumstellar material at the time of explosion. If present, this material will
be ionized by the ultra-violet radiation of the explosion and later recombine.
This ionization-recombination should manifest itself as time-variable
absorption features that can be detected via multi-epoch
high-spectral-resolution observations. Previous studies have shown that the
strongest effect is seen in the neutral sodium D lines. We report on
observations of neutral sodium absorption features observed in multi-epoch
high-resolution spectra of 14 Type Ia supernova events. This is the first
multi-epoch high-resolution study to include multiple SNe. No variability in
line strength that can be associated with circumstellar material is detected.
We find that ~18% of the events in the extended sample exhibit time-variable
sodium features associated with circumstellar material. We explore the
implication of this study on our understanding of the progenitor systems of
Type Ia supernovae via the current Type Ia supernova multi-epoch
high-spectral-resolution sample.