title: Strangeness and charm in quark-gluon hadronization

abstract:
  This dissertation presents a theoretical study of soft hadron production in
relativistic heavy-ion collisions. We explore the principles governing the
hadronization of the expanding QGP fireball, and to understand its properties.
Much of the ongoing effort is to demonstrate the validity of a QGP
hadronization model which describes the particle production data accurately. We
begin with a centrality study of multistrange hadrons from Au-Au collisions at
62.4 GeV at RHIC. We show that the statistical hadronization model (SHM) well
describes particle production in QGP hadronization. For all centralities, the
physical properties are compatible with the earlier proposed critical
hadronization pressure suggesting universal hadronization conditions of QGP.
  Heavy-ion collisions at LHC present a new challenge for SHM in describing
particle production at TeV energy scales. We show that the chemical
non-equilibrium model gives a good description of the hadron production in
Pb--Pb collisions at 2.76 TeV consistently as a function of centrality.
Moreover, the model parameters assume expected values suggested by previous
studies at lower energies. The quark-gluon plasma fireball hadronizes at the
same universal hadronization conditions, that is a common critical pressure,
entropy and energy density.
  At LHC energies, a significant amount of charm is expected to be produced and
it is therefore crucial to incorporate charm into the present description of
particle production. We present an upgraded SHARE with CHARM program, that
quantifies the effect of charm on the yield of lighter hadrons and physical
properties of the hadronizing fireball. In addition to light flavors ($u,d,s$),
SHARE with CHARM describes charm hadron production and decays. We observe, that
according to present experimental results, charm decays mainly affect the
yields of multistrange particles.


title: Henselian Elements

abstract:
  Henselian elements are roots of polynomials which satisfy the conditions of
Hensel's Lemma. In this paper we prove that for a finite field extension
$(F|L,v)$, if $F$ is contained in the absolute inertia field of $L$, then the
valuation ring $\mathcal O_F$ of $(F,v)$ is generated as an $\mathcal
O_L$-algebra by henselian elements. Moreover, we give a list of equivalent
conditions under which $\mathcal O_F$ is generated over $\mathcal O_L$ by
finitely many henselian elements. We prove that if the chain of prime ideals of
$\mathcal O_L$ is well-ordered, then these conditions are satisfied. We give an
example of a finite valued inertial extension $(F|L,v)$ for which $\mathcal
O_F$ is not a finitely generated $\mathcal O_L$-algebra. We also present a
theorem that relates the problem of local uniformization with the theory of
henselian elements.


title: On the Gorenstein and $\mathfrak{F}$-cohomological dimensions

abstract:
  We prove that for any discrete group $G$ with finite
$\mathfrak{F}$-cohomological dimension, the Gorenstein cohomological dimension
equals the $\mathfrak{F}$-cohomological dimension. This is achieved by
constructing a long exact sequence of cohomological functors, analogous to that
constructed by Avramov and Martsinkovsky, containing the
$\mathfrak{F}$-cohomology and complete $\mathfrak{F}$-cohomology. As a
corollary we improve upon a theorem of Degrijse concerning subadditivity of the
$\mathfrak{F}$-cohomological dimension under group extensions.


title:
How Soil Organic Matter Composition Controls
  Hexachlorobenzene-Soil-Interactions: Adsorption Isotherms and Quantum
  Chemical Modelling

abstract:
  Hazardous persistent organic pollutants (POPs) interact in soil with the soil
organic matter (SOM) but this interaction is insufficiently understood at the
molecular level. We investigated the adsorption of hexachlorobenzene (HCB) on
soil samples with systematically modified SOM. These samples included the
original soil, the soil modified by adding a hot water extract (HWE) fraction
(soil+3 HWE and soil+6 HWE), and the pyrolyzed soil. The SOM contents increased
in the order pyrolyzed soil < original soil < soil+3 HWE < soil+6 HWE. For the
latter three samples this order was also valid for the HCB adsorption. The
pyrolyzed soil adsorbed more HCB than the other samples at low initial
concentrations, but at higher concentrations the HCB adsorption became weaker
than in the samples with HWE addition. This adsorption behaviour combined with
the differences in the chemical composition between the soil samples suggested
that alkylated aromatic, phenol, and lignin monomer compounds contributed most
to the HCB adsorption. To obtain a molecular level understanding, a test set
has been developed on the basis of elemental analysis which comprises 32
representative soil constituents. The calculated binding free energy for HCB
with each representative system shows that HCB binds to SOM stronger than to
soil minerals. For SOM, HCB binds to alkylated aromatic, phenols, lignin
monomers, and hydrophobic aliphatic compounds stronger than to polar aliphatic
compounds confirming the above adsorption isotherms. Moreover, quantitative
structure-activity relationship (QSAR) of the binding free energy with
independent physical properties of the test set systems for the first time
indicated that the polarizability, the partial charge on the carbon atoms, and
the molar volume are the most important properties controlling HCB-SOM
interactions.


title:
Monotonicity and regularity of the speed for excited random walks in
  higher dimensions

abstract:
  We introduce a method for studying monotonicity of the speed of excited
random walks in high dimensions, based on a formula for the speed obtained via
cut-times and Girsanov's transform. While the method gives rise to similar
results as have been or can be obtained via the expansion method of van der
Hofstad and Holmes, it may be more palatable to a general probabilistic
audience. We also revisit the law of large numbers for stationary cookie
environments. In particular, we introduce a new notion of $e_1-$exchangeable
cookie environment and prove the law of large numbers for this case.


title: Fermi bubble simulations: black hole feedback in the Milky Way

abstract:
  The $Fermi$ gamma-ray telescope discovered a pair of bubbles at the Galactic
center. These structures are spatially-correlated with the microwave emission
detected by the WMAP and Planck satellites. These bubbles were likely inflated
by a jet launched from the vicinity of a supermassive black hole in the
Galactic center. Using MHD simulations, which self-consistently include
interactions between cosmic rays and magnetic fields, we build models of the
supersonic jet propagation, cosmic ray transport, and the magnetic field
amplification within the $Fermi$ bubbles. Our key findings are that: (1) the
synthetic $Fermi$ gamma-ray and WMAP microwave spectra based on our simulations
are consistent with the observations, suggesting that a single population of
cosmic ray leptons may simultaneously explain the emission across a range of
photon energies; (2) the model fits the observed centrally-peaked microwave
emission if a second, more recent, pair of jets embedded in the $Fermi$ bubbles
is included in the model. This is consistent with the observationally-based
suggestion made by Su & Finkbeiner (2012); (3) the radio emission from the
bubbles is expected to be strongly polarized due to the relatively high level
of field ordering caused by elongated turbulent vortices. This effect is caused
by the interaction of the shocks driven by the jets with the preexisting
interstellar medium turbulence; (4) a layer of enhanced rotation measure in the
shock-compressed region could exist in the bubble vicinity but the level of
this enhancement depends on the details of the magnetic topology.


title: Shooting String Holography of Jet Quenching at RHIC and LHC

abstract:
  We derive a new formula for jet energy loss using finite endpoint momentum
shooting strings initial conditions in SYM plasmas to overcome the difficulties
of previous falling string holographic scenarios. We apply the new formula to
compute the nuclear modification factor RAA and the elliptic flow parameter v2
of light hadrons at RHIC and LHC. We show furthermore that Gauss-Bonnet
quadratic curvature corrections to the AdS5 geometry improve the agreement with
the recent data.


title:
Current induced torques between ferromagnets and compensated
  antiferromagnets: symmetry and phase coherence effects

abstract:
  It is shown that the current-induced torques between a ferromagnetic layer
and an antiferromagnetic layer with a compensated interface vanish when the
ferromagnet is aligned with an axis of spin-rotation symmetry of the
antiferromagnet. For properly chosen geometries this implies that the current
induced torque can stabilize the out-of-plane (or hard axis) orientation of the
ferromagnetic layer. This current-induced torque relies on phase coherent
transport, and we calculate the robustness of this torque to phase breaking
scattering. From this it is shown that the torque is not linearly dependent on
applied current, but has an absolute maximum.


title:
A Tidal Disruption Event in a Nearby Galaxy Hosting an Intermediate Mass
  Black Hole

abstract:
  We report the serendipitous discovery of a bright point source flare in the
Abell cluster 1795 with archival EUVE and Chandra observations. Assuming the
EUVE emission is associated with the Chandra source, the X-ray 0.5-7 keV flux
declined by a factor of ~2300 over a time span of 6 years, following a
power-law decay with index ~2.44+-0.40. The Chandra data alone vary by a factor
of ~20. The spectrum is well fit by a blackbody with a constant temperature of
kT~0.09 keV (~10^6 K). The flare is spatially coincident with the nuclear
region of a faint, inactive galaxy with a photometric redshift consistent at
the one sigma level with the cluster (z=0.062476). We argue that these
properties are indicative of a tidal disruption of a star by a black hole with
log(M_BH/M_sun)~5.5+-0.5. If so, such a discovery indicates that tidal
disruption flares may be used to probe black holes in the intermediate mass
range, which are very difficult to study by other means.


title:
Analytical Studies of Quasi Steady-State Model in Power System Long-Term
  Stability Analysis

abstract:
  In this paper, a theoretical foundation for the Quasi Steady-State (QSS)
model in power system long-term stability analysis is developed. Sufficient
conditions under which the QSS model gives accurate approximations of the
long-term stability model in terms of trajectory and !-limit set are derived.
These sufficient conditions provide some physical insights regarding the reason
for the failure of the QSS model. Additionally, several numerical examples are
presented to illustrate the analytical results derived.


title: Bishop-Runge approximations and inversion of a Riemann-Klein theorem

abstract:
  In this paper we give results about projective embeddings of Riemann
surfaces, smooth or nodal, which we apply to the inverse Dirichlet-to-Neumann
problem and to the inversion of a Riemann-Klein theorem. To produce useful
embeddings, we adapt a technique of Bishop in the open bordered case and use
Runge type harmonic approximation theorem in the compact case.


title:
Automated identification and characterization of parcels (AICP) with
  OpenStreetMap and Points of Interest

abstract:
  Against the paucity of urban parcels in China, this paper proposes a method
to automatically identify and characterize parcels (AICP) with OpenStreetMap
(OSM) and Points of Interest (POI) data. Parcels are the basic spatial units
for fine-scale urban modeling, urban studies, as well as spatial planning.
Conventional ways of identification and characterization of parcels rely on
remote sensing and field surveys, which are labor intensive and
resource-consuming. Poorly developed digital infrastructure, limited resources,
and institutional barriers have all hampered the gathering and application of
parcel data in developing countries. Against this backdrop, we employ OSM road
networks to identify parcel geometries and POI data to infer parcel
characteristics. A vector-based CA model is adopted to select urban parcels.
The method is applied to the entire state of China and identifies 82,645 urban
parcels in 297 cities. Notwithstanding all the caveats of open and/or
crowd-sourced data, our approach could produce reasonably good approximation of
parcels identified from conventional methods, thus having the potential to
become a useful supplement.


title: Direct limits in the heart of a t-structure: the case of a torsion pair

abstract:
  We study the behavior of direct limits in the heart of a t-structure. We
prove that, for any compactly generated t-structure in a triangulated category
with exact coproducts, countable direct limits are exact in its heart. Then,
for a given Grothendieck category G and a torsion pair t = (T ;F) in G, we show
that if the heart of the associated t-structure in the derived category D(G) is
AB5, then F is closed under taking direct limits. The reverse implication is
true, even implying that the heart is a Grothendieck category, for a wide class
of torsion pairs which include the hereditary ones, those for which T is a
cogenerating class and those for which F is a generating class. The results
allow to extend well-known results by Buan-Krause, Bazzoni and Colpi-Gregorio
to the general context of Grothendieck categories and to improve some results
of (co)tlting theory of modules.


title:
On reconstruction formulas for the ray transform acting on symmetric
  differentials on surfaces

abstract:
  The present article proposes a partial answer to the explicit inversion of
the tensor tomography problem in two dimensions, by proving injectivity over
certain kinds of tensors and providing reconstruction formulas for them. These
tensors are symmetric differentials of any order as well as other types
obtained after taking their transverse covariant derivative once. Such
reconstruction formulas require introducing additional types of fiberwise
Hilbert transforms which satisfy a convenient generalization of the
Pestov-Uhlmann commutator formula \cite{Pestov2005}.
  Numerical simulations in {\tt MatLab} are provided using the author's code
presented in \cite{Monard2013}, justifying the exactness of the formulas in
some cases of simple and near-simple metrics, and displaying issues encountered
as one increases either curvature, lack of simplicity, or tensor order, in all
of which cases the formulas derived in the first part become theoretically
insufficient.


title: p-adic L-functions of automorphic forms and exceptional zeros

abstract:
  Let F be a number field, p a prime number. We construct the (multi-variable)
p-adic L-function of an automorphic representation of $GL_2(A_F)$ (with certain
conditions at places above p and $\infty$), which interpolates the complex
L-function at the central critical point. We use this construction to prove
that the p-adic L-function of a modular elliptic curve E over F has vanishing
order greater or equal to the number of primes above p at which E has split
multiplicative reduction, as predicted by the exceptional zero conjecture.
  This is a generalization of analogous results by Spie{\ss} (arXiv:1207.2289)
over totally real fields.


title:
Co-annihilating Dark Matter: Effective Operator Analysis and Collider
  Phenomenology

abstract:
  We study dark matter (DM) models in which there are two dark sector
particles, $\chi_1$ and $\chi_2$, of near mass. In such models, co-annihilation
of $\chi_1$ and $\chi_2$ may be the dominant process controlling the DM relic
density during freezeout in the early universe. In this scenario, there is no
significant contribution to direct and indirect detection signals, unless there
exists an extreme degeneracy in the masses of the lightest dark sector
particles. Therefore, relic density constraints and collider searches provide
the most relevant information about these models. We consider Dirac fermion
dark matter which couples to standard model (SM) particles via an effective
operator. For the collider phenomenology, where an effective field theory may
not be valid, we adopt a simple Z' model to provide an appropriate UV
completion. We explore the interesting LHC signals that arise from the dark
matter production process $pp \rightarrow \overline{\chi_1} + \chi_2 + \textrm{
jet}$, followed by the decay $\chi_2 \rightarrow \chi_1 + SM$.


title: On the quantitative distribution of polynomial nilsequences - erratum

abstract:
  This is an erratum to 'On the quantitative distribution of polynomial
nilsequences' [GT]. The proof of Theorem 8.6 of that paper, which claims a
distribution result for multiparameter polynomial sequences on nilmanifolds,
was incorrect. We provide two fixes for this issue here. First, we deduce the
"equal sides" case $N_1 = \dots = N_t = N$ of [GT, Theorem 8.6] from the
1-parameter results in [GT]. This is the same basic mode of argument we
attempted in the original paper, though the details are different. The equal
sides case is the only one required in applications such as the proof of the
inverse conjectures for the Gowers norms due to the authors and Ziegler.
Second, we sketch a proof that [GT, Theorem 8.6] does in fact hold in its
originally stated form, that is to say without the equal sides condition. To
obtain this statement the entire argument of [GT] must be run in the context of
multiparameter polynomial sequences $g : \mathbb{Z}^t \rightarrow G$ rather
than 1-parameter sequences $g : \mathbb{Z} \rightarrow G$ as is currently done.


title:
Tuning a Schottky barrier in a photoexcited topological insulator with
  transient Dirac cone electron-hole asymmetry

abstract:
  The advent of Dirac materials has made it possible to realize two dimensional
gases of relativistic fermions with unprecedented transport properties in
condensed matter. Their photoconductive control with ultrafast light pulses is
opening new perspectives for the transmission of current and information. Here
we show that the interplay of surface and bulk transient carrier dynamics in a
photoexcited topological insulator can control an essential parameter for
photoconductivity - the balance between excess electrons and holes in the Dirac
cone. This can result in a strongly out of equilibrium gas of hot relativistic
fermions, characterized by a surprisingly long lifetime of more than 50 ps, and
a simultaneous transient shift of chemical potential by as much as 100 meV. The
unique properties of this transient Dirac cone make it possible to tune with
ultrafast light pulses a relativistic nanoscale Schottky barrier, in a way that
is impossible with conventional optoelectronic materials.


title: On the frame bundle adapted to a submanifold

abstract:
  Let $M$ be a submanifold of a Riemannian manifold $(N,g)$. $M$ induces a
subbundle $O(M,N)$ of adapted frames over $M$ of the bundle of orthonormal
frames $O(N)$. Riemannian metric $g$ induces natural metric on $O(N)$. We study
the geometry of a submanifold $O(M,N)$ in $O(N)$. We characterize the
horizontal distribution of $O(M,N)$ and state its correspondence with the
horizontal lift in $O(N)$ induced by the Levi--Civita connection on $N$.
  In the case of extrinsic geometry, we show that minimality is equivalent to
harmonicity of the Gauss map of the submanifold $M$ with deformed Riemannian
metric. In the case of intrinsic geometry we compute the curvatures.


title:
Temperature and high strain rate dependence of tensile deformation
  behavior in single crystal iron from dislocation dynamics simulations

abstract:
  We conduct dislocation dynamics (DD) simulations of Fe periodic single
crystals under tensile load at several high strain rates and temperatures. The
simulations are enabled by the recent development of temperature-dependent
dislocation mobility relations obtained from atomistic calculations. The
plastic evolution in the simulations is governed by rapid initial dislocation
multiplication, followed by a saturation of the flow stress when the
subpopulation of slow plastic carriers becomes stabilized by dislocation
annihilation. Above 500 K, edge dislocations coexist with screw dislocations
and contribute proportionaly to the value of the flow stress. The DD
simulations are used to interpret shock-loading experiments in Fe in terms of
the relative importance of different strengthening mechanisms. We find that in
the $10^4$-to-$10^6$ s$^{-1}$ strain rate regime, work hardening explains the
hardening of shock-loaded bulk Fe crystals.


title:
Lorentzian Flat Lie Groups Admitting a Timelike Left-Invariant Killing
  Vector Field

abstract:
  We call a connected Lie group endowed with a left-invariant Lorentzian flat
metric Lorentzian flat Lie group. In this Note, we determine all Lorentzian
flat Lie groups admitting a timelike left-invariant Killing vector field. We
show that these Lie groups are 2-solvable and unimodular and hence geodesically
complete. Moreover, we show that a Lorentzian flat Lie group $(\mathrm{G},\mu)$
admits a timelike left-invariant Killing vector field if and only if
$\mathrm{G}$ admits a left-invariant Riemannian metric which has the same
Levi-Civita connection of $\mu$. Finally, we give an useful characterization of
left-invariant pseudo-Riemannian flat metrics on Lie groups $\mathrm{G}$
satisfying the property: for any couple of left invariant vector fields $X$ and
$Y$ their Lie bracket $[X,Y]$ is a linear combination of $X$ and $Y$.


title:
On monoids of monotone injective partial selfmaps of
  $L_n\times_{\operatorname{lex}}\mathbb{Z}$ with co-finite domains and images

abstract:
  We study the semigroup
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ of monotone
injective partial selfmaps of the set of
$L_n\times_{\operatorname{lex}}\mathbb{Z}$ having co-finite domain and image,
where $L_n\times_{\operatorname{lex}}\mathbb{Z}$ is the lexicographic product
of $n$-elements chain and the set of integers with the usual order. We show
that $\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ is bisimple
and establish its projective congruences. We prove that
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ is finitely
generated, and for $n=1$ every automorphism of
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ is inner and
show that in the case $n\geqslant 2$ the semigroup
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ has non-inner
automorphisms. Also we show that every Baire topology $\tau$ on
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ such that
$(\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}}),\tau)$ is a
Hausdorff semitopological semigroup is discrete, construct a non-discrete
Hausdorff semigroup inverse topology on
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$, and prove that
the discrete semigroup
$\mathscr{I\!O}\!_{\infty}(\mathbb{Z}^n_{\operatorname{lex}})$ cannot be
embedded into some classes of compact-like topological semigroups and that its
remainder under the closure in a topological semigroup $S$ is an ideal in $S$.


title: Inverse questions for the large sieve

abstract:
  Suppose that an infinite set $A$ occupies at most $\frac{1}{2}(p+1)$ residue
classes modulo $p$, for every sufficiently large prime $p$. The squares, or
more generally the integer values of any quadratic, are an example of such a
set. By the large sieve inequality the number of elements of $A$ that are at
most $X$ is $O(X^{1/2})$, and the quadratic examples show that this is sharp.
The simplest form of the inverse large sieve problem asks whether they are the
only examples. We prove a variety of results and formulate various conjectures
in connection with this problem, including several improvements of the large
sieve bound when the residue classes occupied by $A$ have some additive
structure. Unfortunately we cannot solve the problem itself.


title: The Raman dressed spin-1 spin-orbit coupled quantum gas

abstract:
  The recently realized spin-orbit coupled quantum gases (Y.-J Lin {\it et
al}., Nature 471, 83-86 (2011); P. Wang {\it et al}., PRL 109, 095301 (2012);
L. W. Cheuk {\it et al}., PRL 109, 095302 (2012)) mark a breakthrough in the
cold atom community. In these experiments, two hyperfine states are selected
from a hyperfine manifold to mimic a pseudospin-1/2 spin-orbit coupled system
by the method of Raman dressing, which is applicable to both bosonic and
fermionic gases. In this work, we show that the method used in these
experiments can be generalized to create any large pseudospin spin-orbit
coupled gas if more hyperfine states are coupled equally by the Raman lasers.
As an example, we study in detail a quantum gas with three hyperfine states
coupled by the Raman lasers, and show when the state-dependent energy shifts of
the three states are comparable, triple-degenerate minima will appear at the
bottom of the band dispersions, thus realizing a spin-1 spin-orbit coupled
quantum gas. A novel feature of this three minima regime is that there can be
two different kinds of stripe phases with different wavelengths, which has an
interesting connection to the ferromagnetic and polar phases of spin-1 spinor
BECs without spin-orbit coupling.


title: Minimum Delay Huffman Code in Backward Decoding Procedure

abstract:
  For some applications where the speed of decoding and the fault tolerance are
important, like in video storing, one of the successful answers is Fix-Free
Codes. These codes have been applied in some standards like H.263+ and MPEG-4.
The cost of using fix-free codes is to increase the redundancy of the code
which means the increase in the amount of bits we need to represent any peace
of information. Thus we investigated the use of Huffman Codes with low and
negligible backward decoding delay. We showed that for almost all cases there
is always a Minimum Delay Huffman Code for a given length vector. The average
delay of this code for anti-uniform sources is calculated, that is in agreement
with the simulations, and it is shown that this delay is one bit for large
alphabet sources. Also an algorithm is proposed which will find the minimum
delay code with a good performance.


title: Optimal Strategies for a Long-Term Static Investor

abstract:
  The optimal strategies for a long-term static investor are studied. Given a
portfolio of a stock and a bond, we derive the optimal allocation of the
capitols to maximize the expected long-term growth rate of a utility function
of the wealth. When the bond has constant interest rate, three models for the
underlying stock price processes are studied: Heston model, 3/2 model and jump
diffusion model. We also study the optimal strategies for a portfolio in which
the stock price process follows a Black-Scholes model and the bond process has
a Vasicek interest rate that is correlated to the stock price.


title: Moderate and Large Deviations for the Erd\H{o}s-Kac Theorem

abstract:
  The Erd\H{o}s-Kac theorem is a celebrated result in number theory which says
that the number of distinct prime factors of a uniformly chosen random integer
satisfies a central limit theorem. In this paper, we establish the large
deviations and moderate deviations for this problem in a very general setting
for a wide class of additive functions.


title: Convex separably rationally connected complete intersections

abstract:
  We give a generalization of a result of R. Pandharipande to arbitrary
characteristic: We prove that, if $X$ is a convex, separably rationally
connected, smooth complete intersection in $\mathbb{P}^N$ over an algebraically
closed field of arbitrary characteristic, then $X$ is rational homogeneous.


title: Robust Low-rank Tensor Recovery: Models and Algorithms

abstract:
  Robust tensor recovery plays an instrumental role in robustifying tensor
decompositions for multilinear data analysis against outliers, gross
corruptions and missing values and has a diverse array of applications. In this
paper, we study the problem of robust low-rank tensor recovery in a convex
optimization framework, drawing upon recent advances in robust Principal
Component Analysis and tensor completion. We propose tailored optimization
algorithms with global convergence guarantees for solving both the constrained
and the Lagrangian formulations of the problem. These algorithms are based on
the highly efficient alternating direction augmented Lagrangian and accelerated
proximal gradient methods. We also propose a nonconvex model that can often
improve the recovery results from the convex models. We investigate the
empirical recoverability properties of the convex and nonconvex formulations
and compare the computational performance of the algorithms on simulated data.
We demonstrate through a number of real applications the practical
effectiveness of this convex optimization framework for robust low-rank tensor
recovery.


title: Rethinking State-Machine Replication for Parallelism

abstract:
  State-machine replication, a fundamental approach to designing fault-tolerant
services, requires commands to be executed in the same order by all replicas.
Moreover, command execution must be deterministic: each replica must produce
the same output upon executing the same sequence of commands. These
requirements usually result in single-threaded replicas, which hinders service
performance. This paper introduces Parallel State-Machine Replication (P-SMR),
a new approach to parallelism in state-machine replication. P-SMR scales better
than previous proposals since no component plays a centralizing role in the
execution of independent commands---those that can be executed concurrently, as
defined by the service. The paper introduces P-SMR, describes a "commodified
architecture" to implement it, and compares its performance to other proposals
using a key-value store and a networked file system.


title: Bounding the Test Log-Likelihood of Generative Models

abstract:
  Several interesting generative learning algorithms involve a complex
probability distribution over many random variables, involving intractable
normalization constants or latent variable normalization. Some of them may even
not have an analytic expression for the unnormalized probability function and
no tractable approximation. This makes it difficult to estimate the quality of
these models, once they have been trained, or to monitor their quality (e.g.
for early stopping) while training. A previously proposed method is based on
constructing a non-parametric density estimator of the model's probability
function from samples generated by the model. We revisit this idea, propose a
more efficient estimator, and prove that it provides a lower bound on the true
test log-likelihood, and an unbiased estimator as the number of generated
samples goes to infinity, although one that incorporates the effect of poor
mixing. We further propose a biased variant of the estimator that can be used
reliably with a finite number of samples for the purpose of model comparison.


title: Global small solution to the 2D MHD system with a velocity damping term

abstract:
  This paper studies the global well-posedness of the incompressible
magnetohydrodynamic (MHD) system with a velocity damping term. We establish the
global existence and uniqueness of smooth solutions when the initial data is
close to an equilibrium state. In addition, explicit large-time decay rates for
various Sobolev norms of the solutions are also given.


title: Sparse CCA via Precision Adjusted Iterative Thresholding

abstract:
  Sparse Canonical Correlation Analysis (CCA) has received considerable
attention in high-dimensional data analysis to study the relationship between
two sets of random variables. However, there has been remarkably little
theoretical statistical foundation on sparse CCA in high-dimensional settings
despite active methodological and applied research activities. In this paper,
we introduce an elementary sufficient and necessary characterization such that
the solution of CCA is indeed sparse, propose a computationally efficient
procedure, called CAPIT, to estimate the canonical directions, and show that
the procedure is rate-optimal under various assumptions on nuisance parameters.
The procedure is applied to a breast cancer dataset from The Cancer Genome
Atlas project. We identify methylation probes that are associated with genes,
which have been previously characterized as prognosis signatures of the
metastasis of breast cancer.


title: Pathwise stochastic integrals for model free finance

abstract:
  We present two different approaches to stochastic integration in frictionless
model free financial mathematics. The first one is in the spirit of It\^o's
integral and based on a certain topology which is induced by the outer measure
corresponding to the minimal superhedging price. The second one is based on the
controlled rough path integral. We prove that every "typical price path" has a
naturally associated It\^o rough path, and justify the application of the
controlled rough path integral in finance by showing that it is the limit of
non-anticipating Riemann sums, a new result in itself. Compared to the first
approach, rough paths have the disadvantage of severely restricting the space
of integrands, but the advantage of being a Banach space theory. Both
approaches are based entirely on financial arguments and do not require any
probabilistic structure.


title:
Extended Glauber Model of Antiproton-Nucleus Annihilation for All
  Energies and Mass Numbers

abstract:
  Previous analytical formulas in the Glauber model for high-energy
nucleus-nucleus collisions developed by Wong are utilized and extended to study
antiproton-nucleus annihilations for both high and low energies, after taking
into account the effects of Coulomb and nuclear interactions, and the change of
the antiproton momentum inside a nucleus. The extended analytical formulas
capture the main features of the experimental antiproton-nucleus annihilation
cross sections for all energies and mass numbers. At high antiproton energies,
they exhibit the granular property for the lightest nuclei and the black-disk
limit for the heavy nuclei. At low antiproton energies, they display the effect
of the antiproton momentum increase due to the nuclear interaction for the
light nuclei, and the effect of the magnification due to the attractive Coulomb
interaction for the heavy nuclei.


title: Growth Rates of Algebras, II: Wiegold Dichotomy

abstract:
  We investigate the function $d_\mathbf{A}(n)$, which gives the size of a
least size generating set for $\mathbf{A}^n$, in the case where $\mathbf{A}$
has a cube term. We show that if $\mathbf{A}$ has a $k$-cube term and
$\mathbf{A}^k$ is finitely generated, then $d_\mathbf{A}(n) \in O(\log(n))$ if
$\mathbf{A}$ is perfect and $d_\mathbf{A}(n) \in O(n)$ if $\mathbf{A}$ is
imperfect. When $\mathbf{A}$ is finite, then one may replace "Big Oh" with "Big
Theta" in these estimates.


title: Automatic parametrization and mesh deformation for CFD optimization

abstract:
  We present an automatic and memory efficient methods of morphing-based
parametrization of shapes in CFD optimization. Method is based on Kriging and
Radial Basis Function interpolation methods.


title: Towards a unified theory of Sobolev inequalities

abstract:
  We discuss our work on pointwise inequalities for the gradient which are
connected with the isoperimetric profile associated to a given geometry. We
show how they can be used to unify certain aspects of the theory of Sobolev
inequalities. In particular, we discuss our recent papers on fractional order
inequalities, Coulhon type inequalities, transference and dimensionless
inequalities and our forthcoming work on sharp higher order Sobolev
inequalities that can be obtained by iteration.


title: Ordered Biclique Partitions and Communication Complexity Problems

abstract:
  An ordered biclique partition of the complete graph $K_n$ on $n$ vertices is
a collection of bicliques (i.e., complete bipartite graphs) such that (i) every
edge of $K_n$ is covered by at least one and at most two bicliques in the
collection, and (ii) if an edge $e$ is covered by two bicliques then each
endpoint of $e$ is in the first class in one of these bicliques and in the
second class in other one. In this note, we give an explicit construction of
such a collection of size $n^{1/2+o(1)}$, which improves the $O(n^{2/3})$ bound
shown in the previous work [Disc. Appl. Math., 2014].
  As the immediate consequences of this result, we show (i) a construction of
$n \times n$ 0/1 matrices of rank $n^{1/2+o(1)}$ which have a fooling set of
size $n$, i.e., the gap between rank and fooling set size can be at least
almost quadratic, and (ii) an improved lower bound $(2-o(1)) \log N$ on the
nondeterministic communication complexity of the clique vs. independent set
problem, which matches the best known lower bound on the deterministic version
of the problem shown by Kushilevitz, Linial and Ostrovsky [Combinatorica,
1999].


title: Time-like graphical models

abstract:
  We study continuous processes indexed by a special family of graphs.
Processes indexed by vertices of graphs are known as probabilistic graphical
models. Burdzy and Pal in their paper proposed a continuous version of
graphical models -- processes indexed by time-like graphs. We construct a more
general family of continuous processes on a wider family of graphs, find new
properties and solve the conjecture of uniqueness of the distribution for the
process indexed by graphs with infinite number of vertices. We present new
results showing connections to the stochastic heat equation, Markov random
fields, martingales indexed by directed sets and branching Markov processes.


title:
An Overview of Geometric Asymptotic Analysis of Continuous and Discrete
  Painlev\'e Equations

abstract:
  The classical Painlev\'e equations are so well known that it may come as a
surprise to learn that the asymptotic description of its solutions remains
incomplete. The problem lies mainly with the description of families of
solutions in the complex domain. Where asymptotic descriptions are known, they
are stated in the literature as valid for large connected domains, which
include movable poles of families of solutions. However, asymptotic analysis
necessarily assumes that the solutions are bounded and so these domains must be
punctured at locations corresponding to movable poles, leading to asymptotic
results that may not be uniformly valid. To overcome these issues, we recently
carried out asymptotic analysis in Okamoto's geometric space of initial values
for the first and second Painlev\'e equations. In this paper, we review this
method and indicate how it may be extended to the discrete Painlev\'e
equations.

categories: nlin.SI math-ph math.AG math.CA math.DS math.MP


title: Spin Seebeck power generators

abstract:
  We derive expressions for the efficiency and figure of merit of two spin
caloritronic devices based on the spin Seebeck effect (SSE), i.e., the
generation of spin currents by a temperature gradient. The inverse spin Hall
effect is conventionally used to detect the SSE and offers advantages for large
area applications. We also propose a device that converts spin current into
electric one by means of a spin-valve detector, which scales favorably to small
sizes and approaches a figure of merit of 0.5 at room temperature.


title:
Analysis of contact Cauchy-Riemann maps II: canonical neighborhoods and
  exponential convergence for the Morse-Bott case

abstract:
  This is a sequel to the papers [OW1], [OW2]. In [OW1], the authors introduced
a canonical affine connection on $M$ associated to the contact triad
$(M,\lambda,J)$. In [OW2], they used the connection to establish a priori
$W^{k,p}$-coercive estimates for maps $w: \dot \Sigma \to M$ satisfying
$\overline{\partial}^\pi w= 0, \, d(w^*\lambda \circ j) = 0$ \emph{without
involving symplectization}. We call such a pair $(w,j)$ a contact instanton. In
this paper, we first prove a canonical neighborhood theorem of the locus $Q$
foliated by closed Reeb orbits of a Morse-Bott contact form. Then using a
general framework of the three-interval method, we establish exponential decay
estimates for contact instantons $(w,j)$ of the triad $(M,\lambda,J)$, with
$\lambda$ a Morse-Bott contact form and $J$ a CR-almost complex structure
adapted to $Q$, under the condition that the asymptotic charge of $(w,j)$ at
the associated puncture vanishes.
  We also apply the three-interval method to the symplectization case and
provide an alternative approach via tensorial calculations to exponential decay
estimates in the Morse-Bott case for the pseudoholomorphic curves on the
symplectization of contact manifolds. This was previously established by
Bourgeois [Bou] (resp. by Bao [Ba]), by using special coordinates, for the
cylindrical (resp. for the asymptotically cylindrical) ends. The exponential
decay result for the Morse-Bott case is an essential ingredient in the set-up
of the moduli space of pseudoholomorphic curves which plays a central role in
contact homology and symplectic field theory (SFT).


title: Geometric Property (T)

abstract:
  This paper discusses `geometric property (T)'. This is a property of metric
spaces introduced in earlier work of the authors for its applications to
K-theory. Geometric property (T) is a strong form of `expansion property': in
particular for a sequence of finite graphs $(X_n)$, it is strictly stronger
than $(X_n)$ being an expander in the sense that the Cheeger constants $h(X_n)$
are bounded below.
  We show here that geometric property (T) is a coarse invariant, i.e. depends
only on the large-scale geometry of a metric space $X$. We also discuss the
relationships between geometric property (T) and amenability, property (T), and
various coarse geometric notions of a-T-menability. In particular, we show that
property (T) for a residually finite group is characterised by geometric
property (T) for its finite quotients.


title:
Factorized Three-body S-Matrix Restrained by Yang-Baxter Equation and
  Quantum Entanglements

abstract:
  This paper investigates the physical effects of Yang-Baxter equation (YBE) to
quantum entanglements through the 3-body S-matrix in entangling parameter
space. The explicit form of 3-body S-matrix $\breve{R}_{123}(\theta,\varphi)$
based on the 2-body S-matrices is given due to the factorization condition of
YBE. The corresponding chain Hamiltonian has been obtained and diagonalized,
also the Berry phase for 3-body system is given. It turns out that by choosing
different spectral parameters the $\breve{R}(\theta,\varphi)$-matrix gives GHZ
and W state respectively. The extended 1-D Kitaev toy model has been derived.
Examples of the role of the model in entanglement transfer are discussed.


title: Battery Placement on Performance of VAR Controls

abstract:
  Battery's role in the development of smart grid is gaining greater attention
as an energy storage device that can be integrated with a Photovoltaic (PV)
cell in the distribution circuit. As more PVs are connected to the system, real
power injection to the distribution can cause fluctuation in the voltage. Due
to the rapid fluctuation of the voltage, a more advanced volt-ampere reactive
(VAR) power control scheme on a fast time scale is used to minimize the voltage
deviation on the distribution. Employing both global and local dynamic VAR
control schemes in our previous work, we show the effects of battery placement
on the performance of VAR controls in the example of a single branch radial
distribution circuit. Simulations verify that having battery placement at the
rear in the distribution circuit can provide smaller voltage variations and
higher energy savings than front battery placement when used with dynamic VAR
control algorithms.


title:
First Measurement of the Cross-Correlation of CMB Lensing and Galaxy
  Lensing

abstract:
  We measure the cross-correlation of cosmic microwave background lensing
convergence maps derived from Atacama Cosmology Telescope data with galaxy
lensing convergence maps as measured by the Canada-France-Hawaii Telescope
Stripe 82 Survey. The CMB-galaxy lensing cross power spectrum is measured for
the first time with a significance of 4.2{\sigma}, which corresponds to a 12%
constraint on the amplitude of density fluctuations at redshifts ~ 0.9. With
upcoming improved lensing data, this novel type of measurement will become a
powerful cosmological probe, providing a precise measurement of the mass
distribution at intermediate redshifts and serving as a calibrator for
systematic biases in weak lensing measurements.


title: On finite groups with nine centralizers

abstract:
  Given a finite group $G$, let $Cent(G)$ denote the set of distinct
centralizers of elements of $G$. The group $G$ is called $n$-centralizer if
$|Cent(G)|=n$ and primitive $n$-centralizer if
$|Cent(G)|=|Cent(\frac{G}{Z(G)})|=n$. In this paper, we characterize the
$9$-centralizer and the primitive $9$-centralizer groups.


title: Non-trivial Local Attractors of a Three-dimensional Dynamical System

abstract:
  Based on both qualitative method and numerical tests for a series of
particular cases in the parameter region, a=1, 0<b <1, it is shown that the
three-dimensional system (2) may have a series of interesting phenomena on the
non-trivial local attractors, such as the faint attractor (this term is
suggested by the author), the local attractor with complex structure, twin
spatial limit closed orbits, the bifurcation of rotation numbers, and the
spatial limit cycle, etc.. The system (2) is a very rich source in the study of
dynamical system theory.


title:
A Re-examination of the isometric embedding approach to General
  Relativity

abstract:
  We consider gravitational field equations which are Einstein equations
written in terms of embedding coordinates in some higher dimensional Minkowski
space. Our main focus is to address some tricky issues relating to the Cauchy
problem and possible non-equivalence with the intrinsic Einstein theory. The
well known theory introduced by Regge and Teitelboim in 9+1 dimensions is cast
in Cauchy-Kowalevskaya form and therefore local existence and uniqueness
results follow for \emph{analytic} initial data. In seeking a weakening of the
regularity conditions for initial data, we are led naturally to propose a 13+1
dimensional theory. By imposing an appropriate conserved initial value
constraint we are able, in the neighbourhood of a generic (free) embedding, to
obtain a system of nonlinear hyperbolic differential equations. The questions
of long time or global existence and uniqueness are formidable, but we offer
arguments to suggest that the situation is not hopeless if the theory is
modified in an appropriate way. We also present a modification of the
perturbation method of G\"{u}nther to weighted Sobolev spaces, appropriate to
noncompact initial data surfaces with asymptotic fall-off conditions.


title: Approximating Hereditary Discrepancy via Small Width Ellipsoids

abstract:
  The Discrepancy of a hypergraph is the minimum attainable value, over
two-colorings of its vertices, of the maximum absolute imbalance of any
hyperedge. The Hereditary Discrepancy of a hypergraph, defined as the maximum
discrepancy of a restriction of the hypergraph to a subset of its vertices, is
a measure of its complexity. Lovasz, Spencer and Vesztergombi (1986) related
the natural extension of this quantity to matrices to rounding algorithms for
linear programs, and gave a determinant based lower bound on the hereditary
discrepancy. Matousek (2011) showed that this bound is tight up to a
polylogarithmic factor, leaving open the question of actually computing this
bound. Recent work by Nikolov, Talwar and Zhang (2013) showed a polynomial time
$\tilde{O}(\log^3 n)$-approximation to hereditary discrepancy, as a by-product
of their work in differential privacy. In this paper, we give a direct simple
$O(\log^{3/2} n)$-approximation algorithm for this problem. We show that up to
this approximation factor, the hereditary discrepancy of a matrix $A$ is
characterized by the optimal value of simple geometric convex program that
seeks to minimize the largest $\ell_{\infty}$ norm of any point in a ellipsoid
containing the columns of $A$. This characterization promises to be a useful
tool in discrepancy theory.


title: Higher Spin Currents in Wolf Space: Part I

abstract:
  For the N=4 superconformal coset theory described by SU(N+2)/SU(N) (that
contains a Wolf space) with N=3, the N=2 WZW affine current algebra with
constraints is obtained. The 16 generators of the large N=4 linear
superconformal algebra are described by those WZW affine currents explicitly.
By factoring out four spin-1/2 currents and the spin-1 current from these 16
generators, the remaining 11 generators (spin-2 current, four spin-3/2
currents, and six spin-1 currents) corresponding to the large N=4 nonlinear
superconformal algebra are obtained.
  Based on the recent work by Gaberdiel and Gopakumar on the large N=4
holography, the extra 16 currents, with spin contents (1, 3/2, 3/2, 2), (3/2,
2, 2, 5/2), (3/2, 2, 2, 5/2), and (2, 5/2, 5/2, 3) described in terms of N=2
multiplets, are obtained and realized by the WZW affine currents. As a first
step towards N=4 W algebra (which is NOT known so far), the operator product
expansions (OPEs) between the above 11 currents and these extra 16 higher spin
currents are found explicitly. It turns out that the composite fields with
definite U(1) charges, made of above (11+16) currents (which commute with the
Wolf space subgroup SU(N=3) x SU(2) x U(1) currents), occur in the right hand
sides of these OPEs.


title: On structure of the polarization operator in a magnetic field

abstract:
  The polarization operator is investigated at arbitrary photon energy in a
constant and homogeneous magnetic field for the strength H less than the
Schwinger critical value. The effective mass of a real photon with a preset
polarization is considered in the quantum energy region as well as in the
quasiclassical one. Obtained in the quantum region expressions include the
singular terms at the creation threshold of electron and positron on Landau
levels.


title:
Interpolation theorems for operators in non-commutative vector-valued
  symmetric spaces

abstract:
  We prove the version of interpolation theorem for non-commutative
vector-valued fully symmetric spaces associated with fully symmetric Banach
function spaces and a von Neumann algebra equipped with a faithful semifinite
normal trace.


title: Channel and Noise Models for Nonlinear Molecular Communication Systems

abstract:
  Recently, a tabletop molecular communication platform has been developed for
transmitting short text messages across a room. The end-to-end system impulse
response for this platform does not follow previously published theoretical
works because of imperfect receiver, transmitter, and turbulent flows.
Moreover, it is observed that this platform resembles a nonlinear system, which
makes the rich body of theoretical work that has been developed by
communication engineers not applicable to this platform. In this work, we first
introduce corrections to the previous theoretical models of the end-to-end
system impulse response based on the observed data from experimentation. Using
the corrected impulse response models, we then formulate the nonlinearity of
the system as noise and show that through simplifying assumptions it can be
represented as Gaussian noise. Through formulating the system's nonlinearity as
the output a linear system corrupted by noise, the rich toolbox of mathematical
models of communication systems, most of which are based on linearity
assumption, can be applied to this platform.


title: Distributed Computation of Large-scale Graph Problems

abstract:
  Motivated by the increasing need for fast distributed processing of
large-scale graphs such as the Web graph and various social networks, we study
a message-passing distributed computing model for graph processing and present
lower bounds and algorithms for several graph problems. This work is inspired
by recent large-scale graph processing systems (e.g., Pregel and Giraph) which
are designed based on the message-passing model of distributed computing.
  Our model consists of a point-to-point communication network of $k$ machines
interconnected by bandwidth-restricted links. Communicating data between the
machines is the costly operation (as opposed to local computation). The network
is used to process an arbitrary $n$-node input graph (typically $n \gg k > 1$)
that is randomly partitioned among the $k$ machines (a common implementation in
many real world systems). Our goal is to study fundamental complexity bounds
for solving graph problems in this model.
  We present techniques for obtaining lower bounds on the distributed time
complexity. Our lower bounds develop and use new bounds in random-partition
communication complexity. We first show a lower bound of $\Omega(n/k)$ rounds
for computing a spanning tree (ST) of the input graph. This result also implies
the same bound for other fundamental problems such as computing a minimum
spanning tree (MST). We also show an $\Omega(n/k^2)$ lower bound for
connectivity, ST verification and other related problems.
  We give algorithms for various fundamental graph problems in our model. We
show that problems such as PageRank, MST, connectivity, and graph covering can
be solved in $\tilde{O}(n/k)$ time, whereas for shortest paths, we present
algorithms that run in $\tilde{O}(n/\sqrt{k})$ time (for $(1+\epsilon)$-factor
approx.) and in $\tilde{O}(n/k)$ time (for $O(\log n)$-factor approx.)
respectively.


title:
Pair Production of Majorana Neutrinos by Annihilation of Charged
  Particles in High Energy Collision

abstract:
  Assuming that neutrinos have non-vanishing magnetic moments, we discuss the
possibility of pair production through annihilation of charged fermions in
high-energy collisions. Adopting the Pauli interaction for photon-neutrino
coupling, we calculate the neutrino pair production cross section in the photon
channel and compare the result with the standard model in $ Z^{0} $ channel. we
demonstrated that the enhancement of the production rate for Majorana neutrino
pairs over the standard model rate can be possible at the center-of-mass energy
of $10 - 100$ TeV for the Large Hadron Collider or the ultra-high-energy cosmic
Ray when the transition magnetic moment is not smaller than $10^{-9} - 10^{-10}
\mu_B$.


title: Novelty Detection Under Multi-Instance Multi-Label Framework

abstract:
  Novelty detection plays an important role in machine learning and signal
processing. This paper studies novelty detection in a new setting where the
data object is represented as a bag of instances and associated with multiple
class labels, referred to as multi-instance multi-label (MIML) learning.
Contrary to the common assumption in MIML that each instance in a bag belongs
to one of the known classes, in novelty detection, we focus on the scenario
where bags may contain novel-class instances. The goal is to determine, for any
given instance in a new bag, whether it belongs to a known class or a novel
class. Detecting novelty in the MIML setting captures many real-world phenomena
and has many potential applications. For example, in a collection of tagged
images, the tag may only cover a subset of objects existing in the images.
Discovering an object whose class has not been previously tagged can be useful
for the purpose of soliciting a label for the new object class. To address this
novel problem, we present a discriminative framework for detecting new class
instances. Experiments demonstrate the effectiveness of our proposed method,
and reveal that the presence of unlabeled novel instances in training bags is
helpful to the detection of such instances in testing stage.


title: The primitive cohomology of the theta divisor of an abelian fivefold

abstract:
  The primitive cohomology of the theta divisor of a principally polarized
abelian variety of dimension $g$ is a Hodge structure of level $g-3$. The Hodge
conjecture predicts that it is contained in the image, under the Abel-Jacobi
map, of the cohomology of a family of curves in the theta divisor. In this
paper we use the Prym map to show that this version of the Hodge conjecture is
true for the theta divisor of a general abelian fivefold.


title:
Enhancement of Critical Current Densities in (Ba,K)Fe2As2 by 320 MeV Au
  Irradiation in Single Crystals and by High-Pressure Sintering in PIT Wires

abstract:
  We demonstrate a large enhancement of critical current density (Jc) up to
1.0x10^7 A/cm2 at 5 K under self-field in (Ba,K)Fe2As2 single crystals by
irradiating 320 MeV Au ions. With the very promising potential of this material
in mind, we have fabricated a (Ba,K)Fe2As2 superconducting wire through a
powder-in-tube method combined with the hot isostatic pressing technique, whose
effectiveness has been proven in industrial Bi2223 tapes. The Jc in the wire at
4.2 K has reached 37 kA/cm2 under self-field and 3.0 kA/cm2 at 90 kOe.
Magneto-optical imaging of the wire confirmed the large intergranular Jc in the
wire core.


title: Charmed Tetraquarks Tcc and Tcs from Dynamical Lattice QCD Simulations

abstract:
  Charmed tetraquarks $T_{cc}=(cc\bar{u}\bar{d})$ and
$T_{cs}=(cs\bar{u}\bar{d})$ are studied through the S-wave meson-meson
interactions, $D$-$D$, $\bar{K}$-$D$, $D$-$D^{*}$ and $\bar{K}$-$D^{*}$, on the
basis of the (2+1)-flavor lattice QCD simulations with the pion mass $m_{\pi}
\simeq $410, 570 and 700 MeV. For the charm quark, the relativistic heavy quark
action is employed to treat its dynamics on the lattice. Using the HAL QCD
method, we extract the S-wave potentials in lattice QCD simulations, from which
the meson-meson scattering phase shifts are calculated. The phase shifts in the
isospin triplet ($I$=1) channels indicate repulsive interactions, while those
in the $I=0$ channels suggest attraction, growing as $m_{\pi}$ decreases. This
is particularly prominent in the $T_{cc} (J^P=1^+,I=0)$ channel, though neither
bound state nor resonance are found in the range $m_{\pi} =410-700$ MeV. We
make a qualitative comparison of our results with the phenomenological diquark
picture.


title: Using virtual parts to optimize the metrology process

abstract:
  In the measurement process, there are many parameters affecting the
measurement results: the influence of the probe system, material stiffness of
measured workpiece, the calibration of the probe with a reference sphere, the
thermal effects. We want to obtain the limits of a measurement methodology to
be able to validate a result. The study is applied to a simple part. We observe
the dispersion of the position of different drilled holes (XYZ values in a
coordinate system) when we change the quality of the part and the method of
calculation. We use the Design of Experiment (Taguchi method) to realize our
study. We study the influence of the part quality on a measurement results. We
consider two parameters to define the part quality (flatness and
perpendicularity). We will also study the influence of different methods of
calculation to determine the coordinate system. We can use two options in
Metrolog XG software (tangent plane with or without orientation constraint).
The originality of this paper is that we present a method for the design of
experiment that uses CATIA (CAD system) to generate the measured parts. In this
way we can realize a design of experiment with a largest number of experimental
results. This is a positive point for a statistical analysis. We are also free
to define the parts we want to study without manufacturing difficulties.


title: Evaluating the Usefulness of Paratransgenesis for Malaria Control

abstract:
  Malaria is a serious global health problem which is especially devastating to
the developing world. Mosquitoes are the carriers of the parasite responsible
for the disease, and hence malaria control programs focus on controlling
mosquito populations. This is done primarily through the spraying of
insecticides, or through the use of insecticide treated bed nets. However,
usage of these insecticides exerts massive selection pressure on mosquitoes,
resulting in insecticide resistant mosquito breeds. Hence, developing
alternative strategies is crucial for sustainable malaria control. Here we
explore the usefulness of paratransgenesis, i.e., introducing genetically
engineered bacteria which secrete anti-plasmodium molecules, inside the
mosquito midgut. The bacteria enter a mosquito's midgut when it drinks from a
sugar bait, i.e., a sugar solution containing the bacterium. We formulate a
mathematical model for evaluating the number of such baits required for
preventing an outbreak. We study scenarios where vectors and hosts mix
homogeneously as well as heterogeneously. We perform a full stability analysis
and calculate the basic reproductive number for both the cases. Additionally,
for the heterogeneous mixing scenario, we propose a targeted bait distribution
strategy. The optimal bait allocation is calculated and is found to be
extremely efficient in terms of bait usage. Our analyses suggest that
paratransgenesis can prevent an outbreak, and hence it offers a viable and
sustainable path to malaria control.


title:
Structural and Dielectric Characterization on Multiferroic
  xNi0.9Zn0.1Fe2O4/(1-x)PbZr0.52Ti0.48O3 Particulate Composite

abstract:
  We have carried out the powder x-ray diffraction and dielectric studies on
multiferroic particulate composite xNi0.9Zn0.1Fe2O4/(1-x)PbZr0.52Ti0.48O3 with
x=0.15, 0.30, 0.45, 0.60, 0.75 and 0.90 to explore the structural and
ferroelectric properties. A conventional double sintering method was used to
prepare the xNi0.9Zn0.1Fe2O4/(1-x)PbZr0.52Ti0.48O3 composites. The structure of
one of the component Ni0.9Zn0.1Fe2O4 is spinel cubic with space group Fd3m,
while the other component PbZr0.52Ti0.48O3 is selected around the morphotropic
phase boundary region in which the tetragonal and monoclinic phases with space
group P4mm and Cm coexist respectively. We have carried out Rietveld refinement
of the structure to check the formation of ideal composites with separate
ferroelectric and ferrite phases. Even though the structural characterization
does not reveal the formation of any new phase due to reaction between the two
components of the composite during sintering, the tetragonality of the
PbZr0.52Ti0.48O3 continuously decreases with increasing the ferrite fraction
while the lattice parameter of ferrite phase increases with increasing fraction
of the ferroelectric phase. Similarly, the dielectric study reveals clear shift
in the ferroelectric to paraelectric phase transition temperature of
PbZr0.52Ti0.48O3 during composite formation suggesting that part of Ni2+, Zn2+/
Fe3+ ions are diffusing at the B-site of PbZr0.52Ti0.48O3 replacing Ti4+, which
in turn decreases its transition temperature. Scanning electron micrograph of
sintered pellet surface confirms the presence of two types of particle
morphology in the particulate composite, corresponding to ferrite and
ferroelectric phases.


title: Asteroseismic analysis of the CoRoT target HD49933

abstract:
  The frequency ratios and of HD 49933 exhibit an increase at high frequencies.
This behavior also exists in the ratios of other stars, which is considered to
result from the low signal-to-noise ratio and the larger line width at the
high-frequency end and could not be predicted by stellar models in previous
work. Our calculations show that the behavior not only can be reproduced by
stellar models, but can be predicted by asymptotic formulas of the ratios. The
frequency ratios of the Sun, too, can be reproduced well by the asymptotic
formulas. The increased behavior derives from the fact that the gradient of
mean molecular weight at the bottom of the radiative region hinders the
propagation of p-modes, while the hindrance does not exist in the convective
core. This behavior should exist in the ratios of stars with a large convective
core. The characteristic of the ratios at high frequencies provides a strict
constraint on stellar models and aids in determining the size of the convective
core and the extent of overshooting. Observational constraints point to a star
with $M=1.28\pm0.01 M_{\odot}$, $R=1.458\pm0.005 R_{\odot}$, $t=1.83\pm0.1$
Gyr, $r_{cc}=0.16\pm0.02 R_{\odot}$, $\alpha=1.85\pm0.05$, and
$\delta_{ov}=0.6\pm0.2$ for HD 49933.


title:
A Complete Solution Classification and Unified Algorithmic Treatment for
  the One- and Two-Step Asymmetric S-Transverse Mass (MT2) Event Scale
  Statistic

abstract:
  The MT2 or "s-transverse mass" statistic was developed to associate a parent
mass scale to a missing transverse energy signature, given that escaping
particles are generally expected in pairs, while collider experiments are
sensitive to just a single transverse momentum vector sum. This document
focuses on the generalized extension of that statistic to asymmetric one- and
two-step decay chains, with arbitrary child particle masses and upstream
missing transverse momentum. It provides a unified theoretical formulation,
complete solution classification, taxonomy of critical points, and technical
algorithmic prescription for treatment of the MT2 event scale. An
implementation of the described algorithm is available for download, and is
also a deployable component of the author's selection cut software package
AEACuS (Algorithmic Event Arbiter and Cut Selector). Appendices address
combinatoric event assembly, algorithm validation, and a complete pseudocode.


title:
Chiral symmetry and axial U(1) symmetry in finite temperature QCD with
  domain-wall fermion

abstract:
  We study the restoration of the spontaneously broken chiral symmetry and the
anomalously broken axial U(1) symmetry in finite temperature QCD at zero
chemical potential. We use 2 flavors lattice QCD with optimal domain-wall
fermion on the $ 16^3 \times 6 $ lattice, with the extent $ N_s = 16 $ in the
fifth dimension, in the temperature range $ T = 130-230 $ MeV. To examine the
restoration of the chiral symmetry and the axial $ U(1) $ symmetry, we use
diluted $ Z_2 $ noises to calculate the chiral condensate, and the chiral
susceptibilities in the scalar and pseudoscalar meson channels, for flavor
singlet and non-singlet respectively. From the degeneracy of the chiral
susceptibilities around $ T_c $, it suggests that the axial $ U(1) $ symmetry
is restored in the chirally symmetric phase. Moreover, we examine the spectral
density $ \rho(\lambda_c) $ of the 4D effective Dirac operator with exact
chiral symmetry, which is obtained by computing zero modes plus (180+180)
conjugate pairs of low-lying modes for each gauge configuration. The
suppression of low modes in the spectral density provides a consistency check
of the restoration of axial $ U(1) $ symmetry in the chirally symmetric phase.


title: The Effects of GQM+Strategies on Organizational Alignment

abstract:
  The increasing role of software for developing products and services requires
that organizations align their software-related activities with high-level
business goals. In practice, this alignment is very difficult and only little
systematic support is available. GQM+Strategies is a method that aims at
aligning organizational goals, strategies, and measurements at all levels of an
organization in a seamless way. This article describes a case study of applying
GQM+Strategies in a globally op- erating industrial R&D organization developing
special-purpose device products for B2B customers. The study analyzes how
GQM+Strategies has helped clarify and harmonize the goal set of the
organization. Results of the study indicate improved alignment and integration
of different goals. In addition, the method helped to make the initially
informal goal-setting more transparent and consequently enabled revising it
while new, more important goals were discovered and comprehended. Moreover,
several elements affecting the achievement of goals as well as impediments were
identified.


title: A multi-phenotypic cancer model with cell plasticity

abstract:
  The conventional cancer stem cell (CSC) theory indicates a hierarchy of CSCs
and non-stem cancer cells (NSCCs), that is, CSCs can differentiate into NSCCs
but not vice versa. However, an alternative paradigm of CSC theory with
reversible cell plasticity among cancer cells has received much attention very
recently. Here we present a generalized multi-phenotypic cancer model by
integrating cell plasticity with the conventional hierarchical structure of
cancer cells. We prove that under very weak assumption, the nonlinear dynamics
of multi-phenotypic proportions in our model has only one stable steady state
and no stable limit cycle. This result theoretically explains the phenotypic
equilibrium phenomena reported in various cancer cell lines. Furthermore,
according to the transient analysis of our model, it is found that cancer cell
plasticity plays an essential role in maintaining the phenotypic diversity in
cancer especially during the transient dynamics. Two biological examples with
experimental data show that the phenotypic conversions from NCSSs to CSCs
greatly contribute to the transient growth of CSCs proportion shortly after the
drastic reduction of it. In particular, an interesting overshooting phenomenon
of CSCs proportion arises in three-phenotypic example. Our work may pave the
way for modeling and analyzing the multi-phenotypic cell population dynamics
with cell plasticity.


title: Equation of State of Nucleon Matters from Lattice QCD Simulations

abstract:
  Nucleon matters are studied based on QCD. We extract nucleon-nucleon
interaction from lattice QCD simulations in a recently developed approach, and
then derive the equations of state of the symmetric nuclear matter and the pure
neutron matter, at zero temperature, in the Brueckner-Hartree-Fock framework.
We find that QCD reproduce known features of the symmetric nuclear matter, such
as the self-binding and saturation, at some values of quark mass. We find also
that the pure neutron matter become more stiff at large density as quark mass
decrease. We apply these equations of state to neutron star and study its mass
and radius.


title: Linking Software Development and Business Strategy Through Measurement

abstract:
  Most of today's products and services are software-based. Organizations that
develop software want to maintain and improve their competitiveness by
controlling software-related risks. To do this, they need to align their
business goals with software development strategies and translate them into
quantitative project management. There is also an increasing need to justify
cost and resources for software and system development and other IT services by
demonstrating their impact on an organisation's higher-level goals. For both,
linking business goals and software-related efforts in an organization is
necessary. However, this is a challenging task, and there is a lack of methods
addressing this gap. The GQM+Strategies approach effectively links goals and
strategies on all levels of an organization by means of goal-oriented
measurement. The approach is based on rationales for deciding about options
when operationalizing goals and for evaluating the success of strategies with
respect to goals.


title: Detection of a Magnetized Disk around a Very Young Protostar

abstract:
  We present subarcsecond resolution polarimetric observations of the 878 mum
thermal dust continuum emission obtained with the Submillimeter Array (SMA)
towards the IRAS 16293-2422 protostellar binary system. We report the detection
of linearly polarized dust emission arising from the circumstellar disk
associated with the IRAS 16293-2422 B protostar. The fractional polarization of
~1.4$% is only slightly lower than that expected from theoretical calculations
in such disks. The magnetic field structure on the plane of the sky derived
from the dust polarization suggests a complex magnetic field geometry in the
disk, possibly associated with a rotating disk that is wrapping the field lines
as expected from the simulations. The polarization around IRAS 16293-2422 A at
subarcsecond angular resolution is only marginally detected.


title:
On the Existence of Solutions of a Class of SDEs with Discontinuous
  Drift and Singular Diffusion

abstract:
  The classical result by It\^o on the existence of strong solutions of
stochastic differential equations (SDEs) with Lipschitz coefficients can be
extended to the case where the drift is only measurable and bounded. These
generalizations are based on techniques presented by Zvonkin and Veretennikov,
which rely on the uniform ellipticity of the diffusion coefficient. In this
paper we study the case of degenerate ellipticity and give sufficient
conditions for the existence of a solution. The conditions on the diffusion
coefficient are more general than previous results and we gain fundamental
insight into the geometric properties of the discontinuity of the drift on the
one hand and the diffusion vector field on the other hand. Besides presenting
existence results for the degenerate elliptic situation, we give an example
illustrating the difficulties in obtaining more general results than those
given. The particular types of SDEs considered arise naturally in the framework
of combined optimal control and filtering problems.


title: Experience of Developing a Meta-Semantic Search Engine

abstract:
  Thinking of todays web search scenario which is mainly keyword based, leads
to the need of effective and meaningful search provided by Semantic Web.
Existing search engines are vulnerable to provide relevant answers to users
query due to their dependency on simple data available in web pages. On other
hand, semantic search engines provide efficient and relevant results as the
semantic web manages information with well defined meaning using ontology. A
Meta-Search engine is a search tool that forwards users query to several
existing search engines and provides combined results by using their own page
ranking algorithm. SemanTelli is a meta semantic search engine that fetches
results from different semantic search engines such as Hakia, DuckDuckGo,
SenseBot through intelligent agents. This paper proposes enhancement of
SemanTelli with improved snippet analysis based page ranking algorithm and
support for image and news search.


title:
Gravitino thermal production revisited and a new cosmological scenario
  of gauge mediation

abstract:
  We present a new scenario of gravitino dark matter which is compatible with
the thermal leptogenesis. We confirm by an explicit calculation in supergravity
that the relic abundance of thermally produced gravitino becomes insensitive to
the reheating temperature once the temperature of the Universe exceeds the mass
scale of the messenger fields. In such a situation, the correct baryon to dark
matter ratio can be obtained by thermal leptogenesis when the reheating
temperature after inflation is high enough. We demonstrate in a concrete model
of gauge mediation that the correct abundance of gravitino and baryon asymmetry
can be reproduced by considering the late-time entropy production from the
decay of the SUSY-breaking pseudo-moduli field. The scenario is realized when
the gravitino mass is 100 MeV lesssim m_{3/2} lesssim 1 GeV, and the messenger
mass scale is 10^6 GeV lesssim M_{mess} lesssim 10^9 GeV.


title: Intelligent Agent for Prediction in E- Negotiation: An Approach

abstract:
  With the proliferation of web technologies it becomes more and more important
to make the traditional negotiation pricing mechanism automated and
intelligent. The behaviour of software agents which negotiate on behalf of
humans is determined by their tactics in the form of decision functions.
Prediction of partners behaviour in negotiation has been an active research
direction in recent years as it will improve the utility gain for the adaptive
negotiation agent and also achieve the agreement much quicker or look after
much higher benefits. In this paper we review the various negotiation methods
and the existing architecture. Although negotiation is practically very complex
activity to automate without human intervention we have proposed architecture
for predicting the opponents behaviour which will take into consideration
various factors which affect the process of negotiation. The basic concept is
that the information about negotiators, their individual actions and dynamics
can be used by software agents equipped with adaptive capabilities to learn
from past negotiations and assist in selecting appropriate negotiation tactics.


title:
Privacy-Preserving Verifiable Incentive Mechanism for Crowdsourcing
  Market Applications

abstract:
  Recently, a novel class of incentive mechanisms is proposed to attract
extensive users to truthfully participate in crowd sensing applications with a
given budget constraint. The class mechanisms also bring good service quality
for the requesters in crowd sensing applications. Although it is so important,
there still exists many verification and privacy challenges, including users'
bids and subtask information privacy and identification privacy, winners' set
privacy of the platform, and the security of the payment outcomes. In this
paper, we present a privacy-preserving verifiable incentive mechanism for crowd
sensing applications with the budget constraint, not only to explore how to
protect the privacies of users and the platform, but also to make the
verifiable payment correct between the platform and users for crowd sensing
applications. Results indicate that our privacy-preserving verifiable incentive
mechanism achieves the same results as the generic one without privacy
preservation.


title: Noncommutative Geometry and dynamical models on U(u(2)) background

abstract:
  In our previous publications we have introduced a differential calculus on
the algebra $U(gl(m))$ based on a new form of the Leibniz rule which differs
from that usually employed in Noncommutative Geometry. This differential
calculus includes partial derivatives in generators of the algebra $U(gl(m))$
and their differentials. The orresponding differential algebra
$\Omega(U(gl(m)))$ is a deformation of the commutative algebra $\Omega({\rm
Sym}(gl(m)))$.A similar claim is valid for the Weyl algebra ${\cal
W}(U(gl(m)))$ generated by the algebra $U(gl(m))$ and the mentioned partial
derivatives. In the particular case $m=2$ we treat the compact form $U(u(2))$
of this algebra as a quantization of the Minkowski space algebra. Below we
consider noncommutative versions of the Klein-Gordon equation and the
Schr\"odinger equation for the hydrogen atom. We show that these quantum models
become in a sense discrete.For the quantum Klein-Gordon model we get (under an
assumption on momenta) an analog of the plane wave, for the quantum hydrogen
atom model we find the first order corrections to the ground state energy and
wave function.


title: Classifying complements for associative algebras

abstract:
  For a given extension $A \subset E$ of associative algebras we describe and
classify up to an isomorphism all $A$-complements of $E$, i.e. all subalgebras
$X$ of $E$ such that $E = A + X$ and $A \cap X = \{0\}$. Let $X$ be a given
complement and $(A, \, X, \, \triangleright, \triangleleft, \leftharpoonup,
\rightharpoonup \bigl)$ the canonical matched pair associated with the
factorization $E = A + X$. We introduce a new type of deformation of the
algebra $X$ by means of the given matched pair and prove that all
$A$-complements of $E$ are isomorphic to such a deformation of $X$. Several
explicit examples involving the matrix algebra are provided.


title: Agent Based Negotiation using Cloud - an Approach in E-Commerce

abstract:
  Cloud computing allows subscription based access to computing. It also allows
storage services over Internet. Automated Negotiation is becoming an emerging,
and important area in the field of Multi Agent Systems in ECommerce. Multi
Agent based negotiation system is necessary to increase the efficiency of
E-negotiation process. Cloud computing provides security and privacy to the
user data and low maintenance costs. We propose a Negotiation system using
cloud. In this system, all product information and multiple agent details are
stored on cloud. Both parties select their agents through cloud for
negotiation. Agent acts as a negotiator. Agents have users details and their
requirements for a particular product. Using users requirement, agents
negotiate on some issues such as price, volume, duration, quality and so on.
After completing negotiation process, agents give feedback to the user about
whether negotiation is successful or not. This negotiation system is dynamic in
nature and increases the agents with the increase in participating user.


title:
Protocol based on compressed sensing for high-speed authentication and
  cryptographic key distribution over a multiparty optical network

abstract:
  We present a protocol for the amplification and distribution of a
one-time-pad cryptographic key over a point-to-multipoint optical network based
on computational ghost imaging (GI) and compressed sensing (CS). It is shown
experimentally that CS imaging can perform faster authentication and increase
the key generation rate by an order of magnitude compared with the scheme using
computational GI alone. The protocol is applicable for any number of legitimate
user, thus, the scheme could be used in real intercity networks where high
speed and high security are crucial.


title: Internal Pattern Matching Queries in a Text and Applications

abstract:
  We consider several types of internal queries: questions about subwords of a
text. As the main tool we develop an optimal data structure for the problem
called here internal pattern matching. This data structure provides
constant-time answers to queries about occurrences of one subword $x$ in
another subword $y$ of a given text, assuming that $|y|=\mathcal{O}(|x|)$,
which allows for a constant-space representation of all occurrences. This
problem can be viewed as a natural extension of the well-studied pattern
matching problem. The data structure has linear size and admits a linear-time
construction algorithm.
  Using the solution to the internal pattern matching problem, we obtain very
efficient data structures answering queries about: primitivity of subwords,
periods of subwords, general substring compression, and cyclic equivalence of
two subwords. All these results improve upon the best previously known
counterparts. The linear construction time of our data structure also allows to
improve the algorithm for finding $\delta$-subrepetitions in a text (a more
general version of maximal repetitions, also called runs). For any fixed
$\delta$ we obtain the first linear-time algorithm, which matches the linear
time complexity of the algorithm computing runs. Our data structure has already
been used as a part of the efficient solutions for subword suffix rank &
selection, as well as substring compression using Burrows-Wheeler transform
composed with run-length encoding.


title: Commune: Shared Ownership in an Agnostic Cloud

abstract:
  Although cloud storage platforms promise a convenient way for users to share
files and engage in collaborations, they require all files to have a single
owner who unilaterally makes access control decisions. Existing clouds are,
thus, agnostic to shared ownership. This can be a significant limitation in
many collaborations because one owner can, for example, delete files and revoke
access without consulting the other collaborators.
  In this paper, we first formally define a notion of shared ownership within a
file access control model. We then propose a solution, called Commune, to the
problem of distributively enforcing shared ownership in agnostic clouds, so
that access grants require the support of a pre-arranged threshold of owners.
Commune can be used in existing clouds without requiring any modifications to
the platforms. We analyze the security of our solution and evaluate its
scalability and performance by means of an implementation integrated with
Amazon S3.


title: Quantum coherence induced second plateau in high-sideband generation

abstract:
  Optically excited electron-hole pairs, driven by a strong terahertz (THz)
field, create high-sidebands in the optical spectrum. The sideband spectrum
exhibits a 'plateau' up to a cutoff of 3.17Up, where Up is the ponderomotive
energy. This cutoff is determined, semi-classically, from the maximum kinetic
energy an electron-hole pair can gain from the THz field along a closed
trajectory. A full quantum treatment reveals a second, classically forbidden,
plateau with a cutoff of 8Up, the maximum kinetic energy an electron-hole pair
can gain from the THz field along an open trajectory. The second plateau
appears because a spatially separated electron and hole can still recombine if
the classical excursion is within the coherence length of the electron-hole
wavefunction or, equivalently, the coherence time is longer than the excursion
time (half the THz field period). This effect broadens the range of materials
and excitation conditions where high-sideband generations can occur, thereby
providing a wealth of novel systems for ultrafast electro-optical applications.


title: Exact post-selection inference, with application to the lasso

abstract:
  We develop a general approach to valid inference after model selection. At
the core of our framework is a result that characterizes the distribution of a
post-selection estimator conditioned on the selection event. We specialize the
approach to model selection by the lasso to form valid confidence intervals for
the selected coefficients and test whether all relevant variables have been
included in the model.


title:
Fundamental performance limits for ideal decoders in high-dimensional
  linear inverse problems

abstract:
  This paper focuses on characterizing the fundamental performance limits that
can be expected from an ideal decoder given a general model, ie, a general
subset of "simple" vectors of interest. First, we extend the so-called notion
of instance optimality of a decoder to settings where one only wishes to
reconstruct some part of the original high dimensional vector from a
low-dimensional observation. This covers practical settings such as medical
imaging of a region of interest, or audio source separation when one is only
interested in estimating the contribution of a specific instrument to a musical
recording. We define instance optimality relatively to a model much beyond the
traditional framework of sparse recovery, and characterize the existence of an
instance optimal decoder in terms of joint properties of the model and the
considered linear operator. Noiseless and noise-robust settings are both
considered. We show somewhat surprisingly that the existence of noise-aware
instance optimal decoders for all noise levels implies the existence of a
noise-blind decoder. A consequence of our results is that for models that are
rich enough to contain an orthonormal basis, the existence of an L2/L2 instance
optimal decoder is only possible when the linear operator is not substantially
dimension-reducing. This covers well-known cases (sparse vectors, low-rank
matrices) as well as a number of seemingly new situations (structured sparsity
and sparse inverse covariance matrices for instance). We exhibit an
operator-dependent norm which, under a model-specific generalization of the
Restricted Isometry Property (RIP), always yields a feasible instance
optimality property. This norm can be upper bounded by an atomic norm relative
to the considered model.


title:
A Decision Tree Approach to Classify Web Services using Quality
  Parameters

abstract:
  With the increase in the number of web services, many web services are
available on internet providing the same functionality, making it difficult to
choose the best one, fulfilling users all requirements. This problem can be
solved by considering the quality of web services to distinguish functionally
similar web services. Nine different quality parameters are considered. Web
services can be classified and ranked using decision tree approach since they
do not require long training period and can be easily interpreted. Various
decision tree and rules approaches available are applied and tested to find the
optimal decision method to correctly classify functionally similar web services
considering their quality parameters.


title:
Multifractal formalism for expanding rational semigroups and random
  complex dynamical systems

abstract:
  We consider the multifractal formalism for the dynamics of semigroups of
rational maps on the Riemann sphere and random complex dynamical systems. We
elaborate a multifractal analysis of level sets given by quotients of Birkhoff
sums with respect to the skew product associated with a semigroup of rational
maps. Applying these results, we perform a multifractal analysis of the
H\"older regularity of limit state functions of random complex dynamical
systems.


title:
Asteroseismology of binary stars and a compilation of core overshoot and
  rotational frequency values of OB stars

abstract:
  After a brief introduction into the asteroseismic modelling of stars, we
provide a compilation of the current seismic estimates of the core overshooting
parameter and of the rotational frequency of single and binary massive stars.
These important stellar parameters have meanwhile become available for eleven
OB-type stars, among which three spectroscopic pulsating binaries and one
magnetic pulsator. We highlight the potential of ongoing and future analyses of
eclipsing binary pulsators as essential laboraties to test stellar structure
and evolution models of single and binary stars.


title: Web-page Indexing based on the Prioritize Ontology Terms

abstract:
  In this world, globalization has become a basic and most popular human trend.
To globalize information, people are going to publish the documents in the
internet. As a result, information volume of internet has become huge. To
handle that huge volume of information, Web searcher uses search engines. The
Webpage indexing mechanism of a search engine plays a big role to retrieve Web
search results in a faster way from the huge volume of Web resources. Web
researchers have introduced various types of Web-page indexing mechanism to
retrieve Webpages from Webpage repository. In this paper, we have illustrated a
new approach of design and development of Webpage indexing. The proposed
Webpage indexing mechanism has applied on domain specific Webpages and we have
identified the Webpage domain based on an Ontology. In our approach, first we
prioritize the Ontology terms that exist in the Webpage content then apply our
own indexing mechanism to index that Webpage. The main advantage of storing an
index is to optimize the speed and performance while finding relevant documents
from the domain specific search engine storage area for a user given search
query.


title: An efficient implementation of Slater-Condon rules

abstract:
  Slater-Condon rules are at the heart of any quantum chemistry method as they
allow to simplify $3N$-dimensional integrals as sums of 3- or 6-dimensional
integrals. In this paper, we propose an efficient implementation of those rules
in order to identify very rapidly which integrals are involved in a matrix
element expressed in the determinant basis set. This implementation takes
advantage of the bit manipulation instructions on x86 architectures that were
introduced in 2008 with the SSE4.2 instruction set. Finding which spin-orbitals
are involved in the calculation of a matrix element doesn't depend on the
number of electrons of the system.


title: A Model Approach to Build Basic Ontology

abstract:
  As todays world grows with the technology on the other hand it seems to be
small with the World Wide Web. With the use of Internet more and more
information can be search from the web. When Users fires a query they want
relevancy in obtained results. In general, search engines perform the ranking
of web pages in an offline mode, which is after the web pages have been
retrieved and stored in the database. But most of the time this method does not
provide relevant results as most of the search engines were using some ranking
algorithms like page Rank, HITS, SALSA and Hilltop. Where these algorithms does
not always provides the results based on the semantic web. So a concept of
Ontology is been introduced in search engines to get more meaningful and
relevant results with respect to the users query.Ontologies are used to capture
knowledge about some domain of interest. Ontology describes the concepts in the
domain and also the relationships that hold between those concepts. Different
ontology languages provide different facilities. The most recent development in
standard ontology languages is OWL (Ontology Web Language) from the World Wide
Web Consortium. OWL makes it possible to describe concept to its full extent
and enables the search engines to provide accurate results to the user.


title: Precision ephemerides for gravitational-wave searches: I. Sco X-1

abstract:
  Rapidly-rotating neutron stars are the only candidates for persistent
high-frequency gravitational wave emission, for which a targeted search can be
performed based on the spin period measured from electromagnetic (e.g. radio
and X-ray) observations. The principal factor determining the sensitivity of
such searches is the measurement precision of the physical parameters of the
system. Neutron stars in X-ray binaries present additional computational
demands for searches due to the uncertainty in the binary parameters. We
present the results of a pilot study with the goal of improving the measurement
precision of binary orbital parameters for candidate gravitational wave
sources. We observed the optical counterpart of Sco X-1 in 2011 June with the
William Herschel Telescope, and also made use of Very Large Telescope
observations in 2011, to provide an additional epoch of radial-velocity
measurements to earlier measurements in 1999. From a circular orbit fit to the
combined dataset, we obtained an improvement of a factor of two in the orbital
period precision, and a factor of 2.5 in the epoch of inferior conjunction
$T_0$. While the new orbital period is consistent with the previous value of
Gottllieb et al. (1975), the new $T_0$ (and the amplitude of variation of the
Bowen line velocities) exhibited a significant shift, which we attribute to
variations in the emission geometry with epoch. We propagate the uncertainties
on these parameters through to the expected Advanced LIGO & VIRGO detector
network observation epochs, and quantify the improvement obtained with
additional optical observations.


title: Full-Duplex Relaying with Half-Duplex Relays

abstract:
  We consider "virtual" full-duplex relaying by means of half-duplex relays. In
this configuration, each relay stage in a multi-hop relaying network is formed
by at least two relays, used alternatively in transmit and receive modes, such
that while one relay transmits its signal to the next stage, the other relay
receives a signal from the previous stage. With such a pipelined scheme, the
source is active and sends a new information message in each time slot. We
consider the achievable rates for different coding schemes and compare them
with a cut-set upper bound, which is tight in certain conditions. In
particular, we show that both lattice-based Compute and Forward (CoF) and
Quantize reMap and Forward (QMF) yield attractive performance and can be easily
implemented. In particular, QMF in this context does not require "long"
messages and joint (non-unique) decoding, if the quantization mean-square
distortion at the relays is chosen appropriately. Also, in the multi-hop case
the gap of QMF from the cut-set upper bound grows logarithmically with the
number of stages, and not linearly as in the case of "noise level"
quantization. Furthermore, we show that CoF is particularly attractive in the
case of multi-hop relaying, when the channel gains have fluctuations not larger
than 3dB, yielding a rate that does not depend on the number of relaying
stages. In particular, we argue that such architecture may be useful for a
wireless backhaul with line-of-sight propagation between the relays.


title: Fluid Approximation of a Call Center Model with Redials and Reconnects

abstract:
  In many call centers, callers may call multiple times. Some of the calls are
re-attempts after abandonments (redials), and some are re-attempts after
connected calls (reconnects). The combination of redials and reconnects has not
been considered when making staffing decisions, while ignoring them will
inevitably lead to under- or overestimation of call volumes, which results in
improper and hence costly staffing decisions. Motivated by this, in this paper
we study call centers where customers can abandon, and abandoned customers may
redial, and when a customer finishes his conversation with an agent, he may
reconnect. We use a fluid model to derive first order approximations for the
number of customers in the redial and reconnect orbits in the heavy traffic. We
show that the fluid limit of such a model is the unique solution to a system of
three differential equations. Furthermore, we use the fluid limit to calculate
the expected total arrival rate, which is then given as an input to the Erlang
A model for the purpose of calculating service levels and abandonment rates.
The performance of such a procedure is validated in the case of single
intervals as well as multiple intervals with changing parameters.


title:
Distributed-Pair Programming can work well and is not just Distributed
  Pair-Programming

abstract:
  Background: Distributed Pair Programming can be performed via screensharing
or via a distributed IDE. The latter offers the freedom of concurrent editing
(which may be helpful or damaging) and has even more awareness deficits than
screen sharing. Objective: Characterize how competent distributed pair
programmers may handle this additional freedom and these additional awareness
deficits and characterize the impacts on the pair programming process. Method:
A revelatory case study, based on direct observation of a single, highly
competent distributed pair of industrial software developers during a 3-day
collaboration. We use recordings of these sessions and conceptualize the
phenomena seen. Results: 1. Skilled pairs may bridge the awareness deficits
without visible obstruction of the overall process. 2. Skilled pairs may use
the additional editing freedom in a useful limited fashion, resulting in
potentially better fluency of the process than local pair programming.
Conclusion: When applied skillfully in an appropriate context, distributed-pair
programming can (not will!) work at least as well as local pair programming.