title:
Rapid divergence of the ecdysone receptor in Diptera and Lepidoptera
  suggests coevolution between ECR and USP-RXR

abstract:
  Ecdysteroid hormones are major regulators in reproduction and development of
insects, including larval molts and metamorphosis. The functional ecdysone
receptor is a heterodimer of ECR (NR1H1) and USP-RXR (NR2B4), which is the
orthologue of vertebrate retinoid X receptors (RXR alpha, beta, gamma). Both
proteins belong to the superfamily of nuclear hormone receptors,
ligand-dependent transcription factors that share two conserved domains: the
DNA-binding domain (DBD) and the ligand-binding domain (LBD). In order to gain
further insight into the evolution of metamorphosis and gene regulation by
ecdysone in arthropods, we performed a phylogenetic analysis of both partners
of the heterodimer ECR/USP-RXR. Overall, 38 USP-RXR and 19 ECR protein
sequences, from 33 species, have been used for this analysis. Interestingly,
sequence alignments and structural comparisons reveal high divergence rates,
for both ECR and USP-RXR, specifically among Diptera and Lepidoptera. The most
impressive differences affect the ligand-binding domain of USP-RXR. In
addition, ECR sequences show variability in other domains, namely the
DNA-binding and the carboxy-terminal F domains. Our data provide the first
evidence that ECR and USP-RXR may have coevolved during holometabolous insect
diversification, leading to a functional divergence of the ecdysone receptor.
These results have general implications on fundamental aspects of insect
development, evolution of nuclear receptors, and the design of specific
insecticides.


title:
An algebraic derivation of the eigenspaces associated with an Ising-like
  spectrum of the superintegrable chiral Potts model

abstract:
  In terms of the $\mathfrak{sl}_{2}$ loop algebra and the algebraic
Bethe-ansatz method, we derive the invariant subspace associated with a given
Ising-like spectrum consisting of $2^{r}$ eigenvalues of the
diagonal-to-diagonal transfer matrix of the superintegrable chiral Potts (SCP)
model with arbitrary inhomogeneous parameters. We show that every regular Bethe
eigenstate of the $\tau_2$-model leads to an Ising-like spectrum and is an
eigenvector of the SCP transfer matrix which is given by the product of two
diagonal-to-diagonal transfer matrices with a constraint on the spectral
parameters. We also show in a sector that the $\tau_2$-model commutes with the
$\mathfrak{sl}_{2}$ loop algebra, $L(\mathfrak{sl}_{2})$, and every regular
Bethe state of the $\tau_2$-model is of highest weight. Thus, from physical
assumptions such as the completeness of the Bethe ansatz, it follows in the
sector that every regular Bethe state of the $\tau_2$-model generates an
$L(\mathfrak{sl}_{2})$-degenerate eigenspace and it gives the invariant
subspace, i.e. the direct sum of the eigenspaces associated with the Ising-like
spectrum.


title: Stability of Tails and 4-Canonical Models

abstract:
  We show that the GIT quotients of suitable loci in the Hilbert and Chow
schemes of 4-canonically embedded curves of genus $g\ge 3$ are the moduli space
$\bar{M}_g^{\text{ps}}$ of pseudo-stable curves constructed by Schubert in
\cite{Schubert} using Chow varieties and 3-canonical models. The only new
ingredient needed in the Hilbert scheme variant is a more careful analysis of
the stability with respect to a certain 1-ps $\lambda$ of the $m^{\text{th}}$
Hilbert points of curves $X$ with elliptic tails. We compute the exact weight
with which $\lambda$ acts, and not just the leading term in $m$ of this weight.
A similar analysis of stability of curves with rational cuspidal tails allows
us to determine the stable and semistable 4-canonical Chow loci. Although here
the geometry of the quotient is more complicated because there are strictly
semi-stable orbits, we are able to again identify it as
$\bar{M}_g^{\text{ps}}$. Our computations yield, as byproducts, examples of
both $m$-Hilbert unstable and $m$-Hilbert stable $X$ that are Chow strictly
semi-stable.


title: A symplectic realization of the Volterra lattice

abstract:
  We examine the multiple Hamiltonian structure and construct a symplectic
realization of the Volterra model. We rediscover the hierarchy of invariants,
Poisson brackets and master symmetries via the use of a recursion operator. The
rational Volterra bracket is obtained using a negative recursion operator.


title: Scheduling Sensors by Tiling Lattices

abstract:
  Suppose that wirelessly communicating sensors are placed in a regular fashion
on the points of a lattice. Common communication protocols allow the sensors to
broadcast messages at arbitrary times, which can lead to problems should two
sensors broadcast at the same time. It is shown that one can exploit a tiling
of the lattice to derive a deterministic periodic schedule for the broadcast
communication of sensors that is guaranteed to be collision-free. The proposed
schedule is shown to be optimal in the number of time slots.


title: Thermal rectification effect of an interacting quantum dot

abstract:
  We investigate nonlinear thermal transport properties of a single interacting
quantum dot with two energy levels tunnel-coupled to two electrodes using
nonequilibrium Green function method and Hartree-Fock decoupling approximation.
In the case of asymmetric tunnel-couplings to two electrodes, for example, when
the upper level of the quantum dot is open for transport, whereas the lower
level is blocked, our calculations predict a strong asymmetry for the heat
(energy) current, which shows that, the quantum dot system may act as a thermal
rectifier in this specific situation.


title: Matricial formulae for partitions

abstract:
  The exponential of the triangular matrix whose entries in the diagonal at
distance $n$ from the principal diagonal are all equal to the sum of the
inverse of the divisors of $n$ is the triangular matrix whose entries in the
diagonal at distance $n$ from the principal diagonal are all equal to the
number of partitions of $n$. A similar result is true for any pair of sequences
satisfying a special recurrence.


title:
Measurement of the 20 and 90 keV resonances in the ${}^{18}{\rm
  O}(p,\alpha){}^{15}$N reaction via THM

abstract:
  The $^{18}{\rm O}(p,\alpha)^{15}{\rm N}$ reaction is of primary importance in
several astrophysical scenarios, including fluorine nucleosynthesis inside AGB
stars as well as oxygen and nitrogen isotopic ratios in meteorite grains. Thus
the indirect measurement of the low energy region of the $^{18}{\rm
O}(p,\alpha)^{15}{\rm N}$ reaction has been performed to reduce the nuclear
uncertainty on theoretical predictions. In particular the strength of the 20
and 90 keV resonances have been deduced and the change in the reaction rate
evaluated.


title: Maximal plurisubharmonic models

abstract:
  An analytic pair of dimension n and center V is a pair (V, M) where M is a
complex manifold of (complex) dimension n and V is a closed totally real
analytic submanifold of dimension n. To an analytic pair (V, M) we associate
the class of the functions u from M to a positive bounded interval which are
plurisubharmonic in M and such that u(p) = 0 for each p in V. If the class
admits a maximal function u, the triple (V, M, u) is said to be a maximal
plurisubharmonic model. After defining a pseudo-metric E(V,M) on the center V
of an analytic pair (V, M) we prove (see Theorem 4.1, Theorem 5.1) that maximal
plurisubharmonic models provide a natural generalization of the Monge-Ampere
models introduced by Lempert and Szoke in [16].


title: Multifractal Formalism and Inequality involving Packing Dimension

abstract:
  This article fits in many studies of multifractal analysis of measure. We
took as a starting point the work of F. Ben Nasr in " Calculs de dimension de
packing " to give a new inequality involving $Dim(\bar{X}^{\alpha})$ which
would be, in certain cases, finer than the inequality established by L. Olsen
in " A multifractal formalism " . Besides we elaborated an application of our
result which gives a better inequality involving $Dim(\bar{X}^{\alpha})$.


title: Dark Entropy

abstract:
  We examine the consequences of a universe with a non-constant cosmological
term in Einstein's equations and find that the Bianchi identities reduce to the
first law of thermodynamics when cosmological term is identified as being
proportional to the entropy density of the universe. This means that
gravitating dark energy can be viewed as entropy, but more, the holographic
principle along with the known expansion of the universe indicates that the
entropy of the universe is growing with time and this leads to a cosmic
repulsion that also grows with time. Direct implications of this result are
calculated and shown to be in good accord with recent observational data.


title:
Broadband lightcurve characteristics of GRBs 980425 and 060218 and
  comparison with long-lag, wide-pulse GRBs

abstract:
  It has been recently argued that low-luminosity gamma-ray bursts (LL-GRBs)
are likely a unique GRB population. Here, we present systematic analysis of the
lightcurve characteristics from X-ray to gamma-ray energy bands for the two
prototypical LL-GRBs 980425 and 060218. It is found that both the pulse width
($w$) and the ratio of the rising width to the decaying width ($r/d$) of theses
two bursts are energy-dependent over a broad energy band. There exists a
significant trend that the pulses tend to be narrower and more symmetry with
respect to the higher energy bands for the two events. Both the X-rays and the
gamma-rays follow the same $w - E$ and $r/d - E$ relations. These facts may
indicate that the X-ray emission tracks the gamma-ray emission and both are
likely to be originated from the same physical mechanism. Their light curves
show significant spectral lags. We calculate the three types of lags with the
pulse peaking time ($t_{peak}$), the pulse centroid time ($t_{cen}$), and the
cross-correlation function (CCF). The derived $t_{peak}$ and $t_{cen}$ are a
power-law function of energy. The lag calculated by CCF is strongly correlated
with that derived from $t_{peak}$. But the lag derived from $t_{cen}$ is less
correlated with that derived from $t_{peak}$ and CCF. The energy dependence of
the lags is shallower at higher energy bands. These characteristics are well
consistent with that observed in typical long-lag, wide-pulse GRBs, suggesting
that GRBs 980425 and 060218 may share the similar radiation physics with them.


title:
Relationship between pulse width and energy in GRB 060124: from X-ray to
  gamma-ray bands

abstract:
  GRB 060124 is the first event that both prompt and afterglow emission were
observed simultaneously by the three \emph{Swift} instruments. Its main peak
also triggered Konus-Wind and HETE-II. Therefore, investigation on both the
temporal and spectral properties of the prompt emission can be extended to
X-ray bands. We perform a detailed analysis on the two well identified pulses
of this burst, and find that the pulses are narrower at higher energies, and
both X-rays and gamma-rays follow the same $w - E$ relation for an individual
pulse. However, there is no a universal power-law index of the $w - E$ relation
among pulses. We find also that the rise-to-decay ratio $r/d$ seems not to
evolve with $E$ and the $r/d$ values are well consistent with that observed in
typical GRBs. The broadband spectral energy distribution also suggest that the
X-rays are consistent with the spectral behavior of the gamma-rays. These
results indicates that the X-ray emission tracks the gamma-ray emission and the
emissions in the two energy bands are likely to be originated from the same
physical mechanism.


title: The Role of Artificial Intelligence Technologies in Crisis Response

abstract:
  Crisis response poses many of the most difficult information technology in
crisis management. It requires information and communication-intensive efforts,
utilized for reducing uncertainty, calculating and comparing costs and
benefits, and managing resources in a fashion beyond those regularly available
to handle routine problems. In this paper, we explore the benefits of
artificial intelligence technologies in crisis response. This paper discusses
the role of artificial intelligence technologies; namely, robotics, ontology
and semantic web, and multi-agent systems in crisis response.


title:
Extracting Programs from Constructive HOL Proofs via IZF
  Set-Theoretic<br> Semantics

abstract:
  Church's Higher Order Logic is a basis for influential proof assistants --
HOL and PVS. Church's logic has a simple set-theoretic semantics, making it
trustworthy and extensible. We factor HOL into a constructive core plus axioms
of excluded middle and choice. We similarly factor standard set theory, ZFC,
into a constructive core, IZF, and axioms of excluded middle and choice. Then
we provide the standard set-theoretic semantics in such a way that the
constructive core of HOL is mapped into IZF. We use the disjunction, numerical
existence and term existence properties of IZF to provide a program extraction
capability from proofs in the constructive core.
  We can implement the disjunction and numerical existence properties in two
different ways: one using Rathjen's realizability for IZF and the other using a
new direct weak normalization result for IZF by Moczydlowski. The latter can
also be used for the term existence property.


title:
Chemical and magnetic impurity effects on electronic properties of
  semiconductor quantum wires

abstract:
  We present a theoretical study of electronic states in magnetic and
nonmagnetic semiconductor quantum wires. The effects of chemical and magnetic
disorder at paramagnetic temperatures are investigated in single-site coherent
potential approximation. It is shown that the nonmagnetic impurity shifts the
band of carriers and suppresses the van Hove singularities of the local density
of states (LDOS) depending on the value of impurity concentration. The magnetic
impurity, however, broadens the band which depends on the strength of exchange
coupling, and in the high impurity concentration, the van Hove singularities in
the LDOS can completely disappear and the curves become smooth.


title: Generalized Jacobi operators in Krein spaces

abstract:
  A special class of generalized Jacobi operators which are self-adjoint in
Krein spaces is presented. A description of the resolvent set of such operators
in terms of solutions of the corresponding recurrence relations is given. In
particular, special attention is paid to the periodic generalized Jacobi
operators. Finally, the spectral properties of generalized Jacobi operators are
applied to prove convergence results for Pad\'e approximants.


title: The Separation of Duty with Privilege Calculus

abstract:
  This paper presents Privilege Calculus (PC) as a new approach of knowledge
representation for Separation of Duty (SD) in the view of process and intents
to improve the reconfigurability and traceability of SD. PC presumes that the
structure of SD should be reduced to the structure of privilege and then the
regulation of system should be analyzed with the help of forms of privilege.


title: Suppression of the commensurate spin-Peierls state in Sc-doped TiOCl

abstract:
  We have performed x-ray scattering measurements on single crystals of the
doped spin-Peierls compound Ti(1-x)Sc(x)OCl (x = 0, 0.01, 0.03). These
measurements reveal that the presence of non-magnetic dopants has a profound
effect on the unconventional spin-Peierls behavior of this system, even at
concentrations as low as 1%. Sc-doping suppresses commensurate fluctuations in
the pseudogap and incommensurate spin-Peierls phases of TiOCl, and prevents the
formation of a long-range ordered spin-Peierls state. Broad incommensurate
scattering develops in the doped compounds near Tc2 ~ 93 K, and persists down
to base temperature (~ 7 K) with no evidence of a lock-in transition. The width
of the incommensurate dimerization peaks indicates short correlation lengths on
the order of ~ 12 angstroms below Tc2. The intensity of the incommensurate
scattering is significantly reduced at higher Sc concentrations, indicating
that the size of the associated lattice displacement decreases rapidly as a
function of doping.


title: Cahn-Hilliard Equations and Phase Transition Dynamics for Binary Systems

abstract:
  The process of phase separation of binary systems is described by the
Cahn-Hilliard equation. The main objective of this article is to give a
classification on the dynamic phase transitions for binary systems using either
the classical Cahn-Hilliard equation or the Cahn-Hilliard equation coupled with
entropy, leading to some interesting physical predictions. The analysis is
based on dynamic transition theory for nonlinear systems and new classification
scheme for dynamic transitions, developed recently by the authors.


title: Quasi-cycles in a spatial predator-prey model

abstract:
  We show that spatial models of simple predator-prey interactions predict that
predator and prey numbers oscillate in time and space. These oscillations are
not seen in the deterministic versions of the models, but are due to stochastic
fluctuations about the time-independent solutions of the deterministic
equations which are amplified due to the existence of a resonance. We calculate
the power spectra of the fluctuations analytically and show that they agree
well with results obtained from stochastic simulations. This work extends the
analysis of these quasi-cycles from that previously developed for well-mixed
systems to spatial systems, and shows that the ideas and methods used for
non-spatial models naturally generalize to the spatial case.


title:
Comparison between shape optimization and volumic level set
  approximation for geometrical functionals

abstract:
  We propose to differentiate a general curvature functional with two different
approaches. In the first one we compute the derivative with the tools of shape
optimization and in the second one we compute the derivative of a volumic
approximation of the functional with respect to a level set function. We show
that the two previous approaches give the same result.


title: Phase Separation of Binary Systems

abstract:
  In this Letter, three physical predictions on the phase separation of binary
systems are derived based on a dynamic transition theory developed recently by
the authors. First, the order of phase transitions is precisely determined by
the sign of a parameter Kd (or a nondimensional parameter K) such that if Kd>0,
the transition is first-order with latent heat and if Kd <0, the transition is
second-order. Second, a theoretical transition diagram is derived, leading in
particular to a prediction that there is only second-order transition for molar
fraction near 1/2. This is different from the prediction made by the classical
transition diagram. Third, a critical length scale is derived such that no
phase separation occurs at any temperature if the length of the container is
smaller than the critical length scale.


title: New absolute magnitude calibrations for detached binaries

abstract:
  Lutz-Kelker bias corrected absolute magnitude calibrations for the detached
binary systems with main-sequence components are presented. The absolute
magnitudes of the calibrator stars were derived at intrinsic colours of
Johnson-Cousins and 2MASS (Two Micron All Sky Survey) photometric systems. As
for the calibrator stars, 44 detached binaries were selected from the Hipparcos
catalogue, which have relative observed parallax errors smaller than 15%
($\sigma_{\pi}/\pi\leq0.15$). The calibration equations which provide the
corrected absolute magnitude for optical and near-infrared pass bands are valid
for wide ranges of colours and absolute magnitudes: $-0.18<(B-V)_{0}<0.91$,
$-1.6<M_{V}<5.5$ and $-0.15<(J-H)_{0}<0.50$, $-0.02<(H-K_{s})_{0}<0.13$,
$0<M_{J}<4$, respectively. The distances computed using the luminosity-colours
(LCs) relation with optical (BV) and near-infrared ($JHK_{s}$) observations
were compared to the distances found from various other methods. The results
show that new absolute magnitude calibrations of this study can be used as a
convenient statistical tool to estimate the true distances of detached binaries
out of Hipparcos' distance limit.


title: Computing expected transition events in reducible Markov chains

abstract:
  We present a closed-form, computable expression for the expected number of
times any transition event occurs during the transient phase of a reducible
Markov chain. Examples of events include time to absorption, number of visits
to a state, traversals of a particular transition, loops from a state to
itself, and arrivals to a state from a particular subset of states. We give an
analogous expression for time-average events, which describe the steady-state
behavior of reducible chains as well as the long-term behavior of irreducible
chains.


title:
A standalone version of IsoFinder for the computational prediction of
  isochores in genome sequences

abstract:
  Isochores are long genome segments relatively homogeneous in G+C. A heuristic
algorithm based on entropic segmentation has been developed by our group, and a
web server implementing all the required components is available. However, a
researcher may want to perform batch processing of many sequences
simultaneously in its local machine, instead of analyzing them on one by one
basis through the web. To this end, standalone versions are required. We report
here the implementation of two standalone programs, able to predict isochores
at the sequence level: 1) a command-line version (IsoFinder) for Windows and
Linux systems; and 2) a user-friendly version (IsoFinderWin) running under
Windows.


title: Stabilizing Randomly Switched Systems

abstract:
  This article is concerned with stability analysis and stabilization of
randomly switched systems under a class of switching signals. The switching
signal is modeled as a jump stochastic (not necessarily Markovian) process
independent of the system state; it selects, at each instant of time, the
active subsystem from a family of systems. Sufficient conditions for stochastic
stability (almost sure, in the mean, and in probability) of the switched system
are established when the subsystems do not possess control inputs, and not
every subsystem is required to be stable. These conditions are employed to
design stabilizing feedback controllers when the subsystems are affine in
control. The analysis is carried out with the aid of multiple Lyapunov-like
functions, and the analysis results together with universal formulae for
feedback stabilization of nonlinear systems constitute our primary tools for
control design


title:
Sur la convergence des s\'eries trigonom\'etriques qui servent \`a
  repr\'esenter une fonction arbitraire entre des limites donn\'ees

abstract:
  Dirichlet proves the general convergence of Fourier series, after pointing
out errors in an earlier attempt by Cauchy. We transcribed from Crelle's
Journal (1829) with numerous typographical corrections, and added a completed
bibliography.
  Dirichlet prouve la convergence g\'en\'erale de la s\'eries de Fourier,
apr\`es avoir montr\'e des erreurs dans un essai par Cauchy. Nous avons
transcrit de Crelle's journal (1829) avec de nombreuses corrections
typographiques, et avons ajout\'e une bibliographie compl\`ete.


title:
Giant formation rates of ultracold molecules via Feshbach Optimized
  Photoassociation

abstract:
  Ultracold molecules offer a broad variety of applications, ranging from
metrology to quantum computing. However, forming "real" ultracold molecules,
{\it i.e.} in deeply bound levels, is a very difficult proposition. Here, we
show how photoassociation in the vicinity of a Feshbach resonance enhance
molecular formation rates by several orders of magnitude. We illustrate this
effect in heteronuclear systems, and find giant rate coefficients even in
deeply bound levels. We also give a simple analytical expression for the
photoassociation rates, and discuss future applications of the Feshbach
Optimized Photoassociation, or FOPA, technique.


title:
Model atmospheres of magnetic chemically peculiar stars. A remarkable
  strong-field Bp SiCrFe star HD137509

abstract:
  In the last few years we have developed stellar model atmospheres which
included effects of anomalous abundances and strong magnetic field. The full
treatment of anomalous Zeeman splitting and polarized radiative transfer were
introduced in the model atmosphere calculations for the first time. In this
investigation we present results of modelling the atmosphere of one of the most
extreme magnetic chemically peculiar stars, HD137509. This Bp SiCrFe star has
the mean surface magnetic field modulus of about 29kG. We use the recent
version of the line-by-line opacity sampling stellar model atmosphere code
LLmodels, which incorporates the full treatment of Zeeman splitting of spectral
lines, detailed polarized radiative transfer and arbitrary abundances. We
compare model predictions with photometric and spectroscopic observations of
the star, aiming to reach a self-consistency between the abundance pattern
derived from high-resolution spectra and abundances used for model atmosphere
calculation. Based on magnetic model atmospheres, we redetermined abundances
and fundamental parameters of HD137509 using spectroscopic and photometric
observations. This allowed us to obtain a better agreement between observed and
theoretical parameters compared to non-magnetic models with individual or
scaled-solar abundances. We confirm that the magnetic field effects should be
taken into account in the stellar parameter determination and abundance
analysis.


title:
On the Estimation of the Proportion of True Recent Infections Using the
  BED Capture Enzyme Immunoassay

abstract:
  In this short note, we analyze the assumptions made by McDougal et al (2006),
both explicit and implicit, in their estimation of the proportion of "true
recent infections" using the BED CEIA. This enables us to write down
expressions for the sensitivity, short term specificity and long term
specificity of a test for recent infection defined by a BED ODn below a
threshold. We then derive an identity which shows the relationship between
these parameters, allowing the elimination of sensitivity and short term
specificity from an expression relating the proportion of "true recent
infections" to the proportion of seropositive individuals testing below
threshold. This has two important consequences. Firstly, the simplified formula
is substantially more amenable to calibration. Secondly, naively treating the
parameters as independent would lead to an incorrect estimate of uncertainty
due to imperfect calibration.


title:
Dissipation in circuit quantum electrodynamics: lasing and cooling of a
  low-frequency oscillator

abstract:
  Superconducting qubits coupled to electric or nanomechanical resonators
display effects previously studied in quantum electrodynamics (QED) and
extensions thereof. Here we study a driven qubit coupled to a low-frequency
tank circuit with particular emphasis on the role of dissipation. When the
qubit is driven to perform Rabi oscillations, with Rabi frequency in resonance
with the oscillator, the latter can be driven far from equilibrium. Blue
detuned driving leads to a population inversion in the qubit and lasing
behavior of the oscillator ("single-atom laser"). For red detuning the qubit
cools the oscillator. This behavior persists at the symmetry point where the
qubit-oscillator coupling is quadratic and decoherence effects are minimized.
Here the system realizes a "single-atom-two-photon laser".


title: Structure of the string R-matrix

abstract:
  By requiring invariance directly under the Yangian symmetry, we rederive
Beisert's quantum R-matrix, in a form that carries explicit dependence on the
representation labels, the braiding factors, and the spectral parameters u_i.
In this way, we demonstrate that there exist a rewriting of its entries, such
that the dependence on the spectral parameters is purely of difference form.
Namely, the latter enter only in the combination u_1-u_2, as indicated by the
shift automorphism of the Yangian. When recasted in this fashion, the entries
exhibit a cleaner structure, which allows to spot new interesting relations
among them. This permits to package them into a practical tensorial expression,
where the non-diagonal entries are taken care by explicit combinations of
symmetry algebra generators.


title: Cores of Geometric Graphs

abstract:
  Cameron and Kazanidis have recently shown that rank-3 graphs are either cores
or have complete cores, and they asked whether this holds for all strongly
regular graphs. We prove that this is true for the point graphs and line graphs
of generalized quadrangles and that when the number of points is sufficiently
large, it is also true for the block graphs of Steiner systems and orthogonal
arrays.


title: Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs

abstract:
  A new hight Tc Fe-based compound system, AFe2As2 with A = K, Cs, K/Sr and
Cs/Sr has been found. Through electron-doping, Tc of the A = K and Cs compounds
rises to ~37 K, and finally enter a spin-density-wave state (SDW) through
further electron doping with Sr. The observation demonstrates the crucial role
of the (FeAs)-layers in the superconductivity in the Fe-based layered system
and the special feature of elemental A-layers in this complex chemical system
may provide new avenues to superconductivity at a higher Tc.


title:
Extreme ultraviolet emission from dense plasmas generated with sub-10-fs
  laser pulses

abstract:
  The extreme ultraviolet (XUV) emission from dense plasmas generated with
sub-10-fs laser pulses with varying peak intensities up to 3*10^16 W/cm^2 is
investigated for different target materials. K shell spectra are obtained from
low Z targets (carbon and boron nitride). In the spectra a series limit for the
hydrogen and helium like resonance lines is observed indicating that the plasma
is at high density and pressure ionization has removed the higher levels. In
addition, L shell spectra from titanium targets were obtained. Basic features
of the K and L shell spectra are reproduced with computer simulations. The
calculations include hydrodynamic simulation of the plasma expansion and
collisional radiative calculations of the XUV emission.


title: Directed abelian algebras and their applications to stochastic models

abstract:
  To each directed acyclic graph (this includes some D-dimensional lattices)
one can associate some abelian algebras that we call directed abelian algebras
(DAA). On each site of the graph one attaches a generator of the algebra. These
algebras depend on several parameters and are semisimple. Using any DAA one can
define a family of Hamiltonians which give the continuous time evolution of a
stochastic process. The calculation of the spectra and ground state
wavefunctions (stationary states probability distributions) is an easy
algebraic exercise. If one considers D-dimensional lattices and choose
Hamiltonians linear in the generators, in the finite-size scaling the
Hamiltonian spectrum is gapless with a critical dynamic exponent $z = D$. One
possible application of the DAA is to sandpile models. In the paper we present
this application considering one and two dimensional lattices. In the one
dimensional case, when the DAA conserves the number of particles, the
avalanches belong to the random walker universality class (critical exponent
$\sigma_{\tau} = 3/2$). We study the local densityof particles inside large
avalanches showing a depletion of particles at the source of the avalanche and
an enrichment at its end. In two dimensions we did extensive Monte-Carlo
simulations and found $\sigma_{\tau} = 1.782 \pm 0.005$.


title:
Axisymmetric models for galaxies by equipotential and equidensity
  methods

abstract:
  In this paper we outline equipotential and equidensity methods of
constructing axisymmetric models for galaxies. The former method defines
equipotentials, from which the corresponding densities of the galaxy models can
be obtained using Poisson's equation; the latter defines the equidensity
surfaces of the galaxy models directly.


title: General Flattened Jaffe Models for Galaxies

abstract:
  In this paper we extend oblate and prolate Jaffe models into more general
flattened Jaffe models. Since dynamical properties of oblate and prolate Jaffe
Models have been studied by Jiang & Moss, they are not repeated here.


title: Visibility study of graphene multilayer structures

abstract:
  The visibility of graphene sheets on different types of substrates has been
investigated both theoretically and experimentally. Although single layer
graphene is observable on various types of dielectrics under an optical
microscope, it is invisible when it is placed directly on most of the
semiconductor and metallic substrates. We show that coating of a resist layer
with optimum thickness is an effective way to enhance the contrast of graphene
on various types of substrates and makes single layer graphene visible on most
semiconductor and metallic substrates. Experiments have been performed to
verify the results on quartz and NiFe-coated Si substrates. The results
obtained will be useful for fabricating graphene-based devices on various types
of substrates for electronics, spintronics and optoelectronics applications.


title: Regular Maximal Monotone Multifunctions and Enlargements

abstract:
  In this note we use recent results concerning the sum theorem for maximal
monotone multifunctions in general Banach spaces to find new characterizations
and properties of regular maximal monotone multifunctions and then use these to
describe the domain of certain enlargements.


title: Parabolic principal Higgs bundles

abstract:
  In ``Ramified G-bundles as parabolic bundles'' (J. Ramanujan Math. Soc.
(2003) Vol. 18) with Balaji and Nagaraj we introduced the ramified principal
bundles. The aim here is to define the Higgs bundles in the ramified context.


title:
Sharp asymptotics for the Neumann Laplacian with variable magnetic field
  : case of dimension 2

abstract:
  The aim of this paper is to establish estimates of the lowest eigenvalue of
the Neumann realization of $(i\nabla+B\textbf{A})^2$ on an open bounded subset
of $\mathbb{R}^2$ $\Omega$ with smooth boundary as $B$ tends to infinity. We
introduce a "magnetic" curvature mixing the curvature of $\partial\Omega$ and
the normal derivative of the magnetic field and obtain an estimate analogous
with the one of constant case. Actually, we give a precise estimate of the
lowest eigenvalue in the case where the restriction of magnetic field to the
boundary admits a unique minimum which is non degenerate. We also give an
estimate of the third critical field in Ginzburg-Landau theory in the variable
magnetic field case.


title:
Acceleration-extended Newton-Hooke symmetry and its dynamical
  realization

abstract:
  Newton-Hooke group is the nonrelativistic limit of de Sitter (anti-de Sitter)
group, which can be enlarged with transformations that describe constant
acceleration, as well as central charges. We consider a higher order Lagrangian
that is quasi-invariant under the acceleration-extended Newton-Hooke symmetry,
and obtain the Schr\"{o}dinger equation quantizing the Hamiltonian
corresponding to its first order form. We show that the Schr\"{o}dinger
equation is invariant under the acceleration-extended Newton-Hooke
transformations. We also discuss briefly the exotic conformal Newton-Hooke
symmetry in 2+1 dimension.


title: Decaying Sterile Neutrinos as a Heating Source in the Milky Way Center

abstract:
  Recent Chandra and Newton observations indicate that there are
two-temperature components ($T \sim$ 8 keV, 0.8 keV) of the diffuse x-rays
emitted from deep inside the center of Milky Way. We show that this can be
explained by the existence of sterile neutrinos, which decay to emit photons
that can be bound-free absorbed by the isothermal hot gas particles in the
center of Milky Way. This model can account for the two-temperature components
naturally as well as the energy needed to maintain the $\sim$ 8 keV temperature
in the hot gas. The predicted sterile neutrino mass is between 16-18 keV.


title: Insufficiency of the Brauer-Manin obstruction applied to etale covers

abstract:
  Let k be any global field of characteristic not 2. We construct a k-variety X
such that X(k) is empty, but for which the emptiness cannot be explained by the
Brauer-Manin obstruction or even by the Brauer-Manin obstruction applied to
finite etale covers.


title: Observed properties of FRII quasars and radio galaxies at z < 1.0

abstract:
  In a long-term observing project we have imaged a complete sample of FRII
quasars and radio galaxies with z < 1.0 at high resolution and high sensitivity
with the VLA and MERLIN. This sample of 98 sources includes 15 quasars, 11
broad line radio galaxies and 57 narrow line radio galaxies, allowing
unification to be considered in terms of source morphological properties. Radio
maps of all the targets have been presented in earlier papers. Here we carry
out a systematic analysis of the properties of the jets, cores, lobes and
hotspots of objects in the sample. The majority of the tests that we perform
show that the data are consistent with a model in which quasars and broad-line
radio galaxies are unified with narrow-line objects. Relativistic beaming is
the main effect that determines the properties of kiloparsec-scale jets, and it
may also have some effect on hotspots. However, some properties of the sample
are difficult to account for in simple unified models.


title: Toward an understanding of entanglement for generalized n-qubit W-states

abstract:
  We solve stationarity equations of the geometric measure of entanglement for
multi-qubit W-type states. In this way we compute analytically the maximal
overlap of one-parameter $n$-qubit and two-parameter four-qubit W-type states
and their nearest product states. Possible extensions to arbitrary W-type
states and geometrical interpretations of these results are discussed in
detail.


title:
Electronic properties of bulk and thin film SrRuO$_3$: a search for the
  metal-insulator transition

abstract:
  We calculate the properties of the 4$d$ ferromagnet SrRuO$_3$ in bulk and
thin film form with the aim of understanding the experimentally observed metal
to insulator transition at reduced thickness. Although the spatial extent of
the 4$d$ orbitals is quite large, many experimental results have suggested that
electron-electron correlations play an important role in determining this
material's electronic structure. In order to investigate the importance of
correlation, we use two approaches which go beyond the conventional local
density approximation to density functional theory (DFT): the local spin
density approximation + Hubbard $U$ (LSDA+$U$) and the pseudopotential
self-interaction correction (pseudo-SIC) methods. We find that the details of
the electronic structure predicted with the LSDA do not agree with the
experimental spectroscopic data for bulk and thin film SrRuO$_3$. Improvement
is found by including electron-electron correlations, and we suggest that bulk
orthorhombic SrRuO$_3$ is a {\it weakly strongly-correlated} ferromagnet whose
electronic structure is best described by a 0.6 eV on-site Hubbard term, or
equivalently with corrections for the self-interaction error. We also perform
{\it ab initio} transport calculations that confirm that SrRuO$_3$ has a
negative spin polarization at the Fermi level, due to the position of the
minority Ru 4$d$ band center. Even with correlations included in our
calculations we are unable to reproduce the experimentally observed
metal-insulator transition, suggesting that the electronic behavior of
SrRuO$_3$ ultra-thin films might be dominated by extrinsic factors such as
surface disorder and defects.


title: The end of Sleeping Beauty's nightmare

abstract:
  The way a rational agent changes her belief in certain
propositions/hypotheses in the light of new evidence lies at the heart of
Bayesian inference. The basic natural assumption, as summarized in van
Fraassen's Reflection Principle ([1984]), would be that in the absence of new
evidence the belief should not change. Yet, there are examples that are claimed
to violate this assumption. The apparent paradox presented by such examples, if
not settled, would demonstrate the inconsistency and/or incompleteness of the
Bayesian approach and without eliminating this inconsistency, the approach
cannot be regarded as scientific.
  The Sleeping Beauty Problem is just such an example. The existing attempts to
solve the problem fall into three categories. The first two share the view that
new evidence is absent, but differ about the conclusion of whether Sleeping
Beauty should change her belief or not, and why. The third category is
characterized by the view that, after all, new evidence (although hidden from
the initial view) is involved.
  My solution is radically different and does not fall in either of these
categories. I deflate the paradox by arguing that the two different degrees of
belief presented in the Sleeping Beauty Problem are in fact beliefs in two
different propositions, i.e. there is no need to explain the (un)change of
belief.


title: QPOs in CVs: An executive summary

abstract:
  An overview is given of the properties of the various kinds of quasi-periodic
luminosity modulations observed in cataclysmic variables (CVs). The two
principal types, known in the CV literature as dwarf nova oscillations and
quasi-periodic oscillations, have similarities to the high and low frequency
quasi-periodic oscillations in X-Ray binaries. There is a further well observed
class known as longer period dwarf nova oscillations. In CVs the observed
interrelations between these oscillations suggests a model of magnetically
controlled accretion onto a rapidly rotating equatorial belt of accreted gas.
Non-radial oscillations of the central white dwarf are observed in some
systems.


title:
Flux pinning mechanism in NdFeAsO0.82F0.18 superconductor: Thermally
  activated flux flow and charge carrier mean free path fluctuation pinning

abstract:
  The flux pinning mechanism of NdO0.82F0.18FeAs superconductor made under high
pressure, with a critical temperature, Tc, of 51 K, has been investigated in
detail in this work. The field dependence of the magnetization and the
temperature dependence of the magnetoresistivity were measured in fields up to
13 T. The field dependence of the critical current density, Jc(B), was analyzed
within the collective pinning model. A crossover field, Bsb, from the single
vortex to the small vortex bundle pinning regime was observed. The temperature
dependence of Bsb(T) is in good agreement with the delta-l pinning mechanism,
i.e., pinning associated with fluctuations in the charge-carrier mean free
path, l. Analysis of resistive transition broadening revealed that thermally
activated flux flow is found to be responsible for the resistivity contribution
in the vicinity of Tc. The activation energy U0/kB is 2000 K in low fields and
scales as B (-1/3) over a wide field range. Our results indicate that the
NdO0.82F0.18FeAs has stronger intrinsic pinning than Bi-2212 and also stronger
than MgB2 for H > 8 T.


title: Wormholes in Bulk Viscous Cosmology

abstract:
  We investigate the effects of the accretion of phantom energy with non-zero
bulk viscosity onto a Morris-Thorne wormhole. We have found that if the bulk
viscosity is large then the mass of wormhole increases rapidly as compared to
small or zero bulk viscosity.


title: Black Holes in Accelerated Universe

abstract:
  We have analyzed the evolution of mass of a stationary black hole in the
standard FRW cosmological model. The evolution is determined specifically about
the time of transition from the earlier matter to the later exotic dark energy
dominated universe. It turns out that the accretion rate of matter on the black
hole of mass $M$ was approximately $10^{54}M^{-1}$ higher than the accretion
rate of exotic dark energy at the time of transition.


title: Embeddings and chains of free groups

abstract:
  We build two non-abelian CSA-groups in which maximal abelian subgroups are
conjugate and divisible.


title:
Stroke volume estimation by thoracocardiography is better when glottis
  is closed

abstract:
  Thoracocardiography approach pretends to non-invasively monitor stroke volume
by inductive plethysmographic recording of ventricular volume curves by a
transducer placed on the chest. The purpose of this study was to investigate
the potential of thoracocardiography to estimate stroke volumes while apnea
with open glottis. We hypothesized that, when glottis is open, stroke volumes
would be better estimated if airways flow curves were taken into account.


title: Dark Energy Phenomenology

abstract:
  We discuss the phenomenology of the dark energy in first order perturbation
theory, demonstrating that the dark energy cannot be fully constrained unless
the dark matter is found, and that there are two functions that characterise
the observational properties of the dark sector for cosmological probes. We
argue that measuring these two functions should be an important goal for
observational cosmology in the next decades.


title: Localization theory for triangulated categories

abstract:
  These notes provide an introduction to the theory of localization for
triangulated categories. Localization is a machinery to formally invert
morphisms in a category. We explain this formalism in some detail and we show
how it is applied to triangulated categories.


title:
Volume Growth and Curvature Decay of Complete Positively Curved
  K\"{a}hler Manifolds

abstract:
  This paper constructs a class of complete K\"{a}hler metrics of positive
holomorphic sectional curvature on ${\bf C}^n$ and finds that the constructed
metrics satisfy the following properties: As the geodesic distance
$\rho\to\infty,$ the volume of geodesic balls grows like
$O(\rho^{\frac{2(\beta+1)n}{\beta+2}})$ and the Riemannian scalar curvature
decays like $O(\rho^{-\frac{2(\beta+1)}{\beta+2}}),$ where $\beta\geq 0.$


title:
Strength distribution of solar magnetic fields in photospheric quiet Sun
  regions

abstract:
  The magnetic topology of the solar photosphere in its quietest regions is
hidden by the difficulties to disentangle magnetic flux through the resolution
element from the field strength of unresolved structures. The observation of
spectral lines with strong coupling with hyperfine structure, like the observed
MnI line at 553.7 nm, allows such differentiation.
  The main aim is to analyse the distribution of field strengths in the network
and intranetwork of the solar photosphere through inversion of the MnI line at
553.7 nm.
  An inversion code for the magnetic field using the Principal Component
Analysis (PCA) has been developed. Statistical tests are run on the code to
validate it. The code has to draw information from the small-amplitude spectral
feature oppearing in the core of the Stokes V profile of the observed line for
field strengths below a certain threshold, coinciding with lower limit of the
Paschen-Back effect in the fine structure of the involved atomic levels.
  The inversion of the observed profiles, using the circular polarization (V)
and the intensity (I), shows the presence of magnetic fields strengths in a
range from 0 to 2 kG, with predominant weak strength values. Mixed regions with
mean strength field values of 1130 and 435 Gauss are found associated with the
network and intranetwork respectively.
  The MnI line at 553 nm probes the field strength distribution in the quiet
sun and shows the predominance of weak, hectoGauss fields in the intranetwork,
and strong, kiloGauss fields in the network. It also shows that both network
and intranetwork are to be understood at our present spatial resolutions as
field distributions of which we hint the mean properties.


title: Cesaro averages of Euler-like functions

abstract:
  By Euler-like function we mean a function defined on the positive integers
and associating to $n$ the product, over all primes $p$ dividing $n$, of 1 plus
(or minus) the inverse of $p$ to the power $s$. We calculate the limit of the
Cesaro mean of these functions.


title:
First-order symmetries of Dirac equation in curved background: a unified
  dynamical symmetry condition

abstract:
  It has been shown that, for all dimensions and signatures, the most general
first-order linear symmetry operators for the Dirac equation including
interaction with Maxwell field in curved background are given in terms of
Killing-Yano (KY) forms. As a general gauge invariant condition it is found
that among all KY-forms of the underlying (pseudo) Riemannian manifold, only
those which Clifford commute with the Maxwell field take part in the symmetry
operator. It is also proved that associated with each KY-form taking part in
the symmetry operator, one can define a quadratic function of velocities which
is a geodesic invariant as well as a constant of motion for the classical
trajectory. Some geometrical and physical implications of the existence of
KY-forms are also elucidated.


title: Anderson Transition in Disordered Graphene

abstract:
  We use the regularized kernel polynomial method (RKPM) to numerically study
the effect disorder on a single layer of graphene. This accurate numerical
method enables us to study very large lattices with millions of sites, and
hence is almost free of finite size errors. Within this approach, both weak and
strong disorder regimes are handled on the same footing. We study the
tight-binding model with on-site disorder, on the honeycomb lattice. We find
that in the weak disorder regime, the Dirac fermions remain extended and their
velocities decrease as the disorder strength is increased. However, if the
disorder is strong enough, there will be a {\em mobility edge} separating {\em
localized states around the Fermi point}, from the remaining extended states.
This is in contrast to the scaling theory of localization which predicts that
all states are localized in two-dimensions (2D).


title: Higgs Searches at the LHC

abstract:
  These proceedings summarize the sensitivity for the ATLAS and CMS experiments
at the LHC to discover a Standard Model Higgs boson with relatively low
integrated luminosity per experiment. A brief discussion on the expected
performance from these experiments in searches for one or more of the Higgs
bosons from the minimal version of the supersymmetric theories is also
included.


title:
Reconsideration of the 2-flavor NJL model with dimensional
  regularization at finite temperature and density

abstract:
  We study the 2-flavor Nambu--Jona-Lasinio (NJL) model at finite temperature,
$T$, and chemical potential, $\mu$, in the dimensional regularization. The pion
and sigma meson masses are calculated at finite $T$ and $\mu$. The color
superconductivity is also discussed in the extended NJL model. We obtain the
phase structure of the chiral and color symmetry in the dimensional
regularization and compare the results with ones obtained in the cut-off
regularization.


title:
A field theory characterization of interacting adiabatic particles in
  cosmology

abstract:
  We explore the adiabatic particle excitations of an interacting field in a
cosmological background. By following the time-evolution of the quantum state
corresponding to the particle excitation, we show how the basic properties
characterizing the particle propagation can be recovered from the two-point
propagators. As an application, we study the background-induced dissipative
effects on the propagation of a two-level atom in an expanding universe.


title: Liouville structures

abstract:
  A 'Liouville structure' is a structure isomorphic to a cotangent vector
fibration. A Liouville structure is an essential ingredient of every
variational formulation of a physical theory. For reasons of interpretation the
Liouville structure can not be replaced by the corresponding cotangent
fibration. We give a precise definition of Liouville structures, study their
properties, and give examples used in variational formulations of mechanics.


title: (Un)attractor black holes in higher derivative AdS gravity

abstract:
  We investigate five-dimensional static (non-)extremal black hole solutions in
higher derivative Anti-de Sitter gravity theories with neutral scalars
non-minimally coupled to gauge fields. We explicitly identify the boundary
counterterms to regularize the gravitational action and the stress tensor. We
illustrate these results by applying the method of holographic renormalization
to computing thermodynamical properties in several concrete examples. We also
construct numerical extremal black hole solutions and discuss the attractor
mechanism by using the entropy function formalism.


title:
Detection of high energy cosmic rays with the resonant gravitational
  wave detector NAUTILUS and EXPLORER

abstract:
  The cryogenic resonant gravitational wave detectors NAUTILUS and EXPLORER,
made of an aluminum alloy bar, can detect cosmic ray showers. At temperatures
above 1 K, when the material is in the normal conducting state, the measured
signals are in good agreement with the values expected based on the cosmic rays
data and on the thermo-acoustic model. When NAUTILUS was operated at the
temperature of 0.14 K, in superconductive state, large signals produced by
cosmic ray interactions, more energetic than expected, were recorded. The
NAUTILUS data in this case are in agreement with the measurements done by a
dedicated experiment on a particle beam. The biggest recorded event was in
EXPLORER and excited the first longitudinal mode to a vibrational energy of
about 670 K, corresponding to about 360 TeV absorbed in the bar. Cosmic rays
can be an important background in future acoustic detectors of improved
sensitivity. At present, they represent a useful tool to verify the
gravitational wave antenna performance.


title: On Discrete Subgroups of automorphism of $P^2_C$

abstract:
  We study the geometry and dynamics of discrete subgroups $\Gamma$ of
$\PSL(3,\mathbb{C})$ with an open invariant set $\Omega \subset \PC^2$ where
the action is properly discontinuous and the quotient $\Omega/\Gamma$ contains
a connected component whicis compact. We call such groups {\it
quasi-cocompact}. In this case $\Omega/\Gamma$ is a compact complex projective
orbifold and $\Omega$ is a {\it divisible set}. Our first theorem refines
classical work by Kobayashi-Ochiai and others about complex surfaces with a
projective structure: We prove that every such group is either virtually affine
or complex hyperbolic. We then classify the divisible sets that appear in this
way, the corresponding quasi-cocompact groups and the orbifolds
$\Omega/\Gamma$. We also prove that excluding a few exceptional cases, the
Kulkarni region of discontinuity coincides with the equicontinuity region and
is the largest open invariant set where the action is properly discontinuous.


title: Realistic Simulation of Local Solar Supergranulation

abstract:
  I represent results three-dimensional numerical simulation of solar surface
convection on scales local supergranulation with realistic model physics. I
study thermal structure of convective motions in photosphere, the range of
convection cell sizes and the penetration depths of convection. A portion of
the solar photosphere extending 100 x 100 Mm horizontally and from 0 Mm down to
20 Mm below the visible surface is considered. I take equation of state and
opacities of stellar matter and distribution with radius of all physical
variables from Solar Standard Model. The equations of fully compressible
radiation hydrodynamics with dynamical viscosity and gravity are solved. The
high order conservative PPML difference scheme for the hydrodynamics, the
method of characteristic for the radiative transfer and dynamical viscosity
from subgrid scale modeling are applied. The simulations are conducted on a
uniform horizontal grid of 1000 x 1000, with 168 nonuniformly spaced vertical
grid points, on 256 processors with distributed memory multiprocessors on
supercomputer MVS5000 in Computational Centre of Russian Academy of Sciences.


title:
Novel electronic structure induced by a highly strained oxide interface
  with incommensurate crystal fields

abstract:
  The misfit oxide, Bi$_{2}$Ba$_{1.3}$K$_{0.6}$Co$_{2.1}$O$_{y}$, made of
alternating rocksalt-structured [BiO/BaO] layers and hexagonal CoO$_{2}$
layers, was studied by angle-resolved photoemission spectroscopy. Detailed
electronic structure of such a highly strained oxide interfaces is revealed for
the first time. We found that under the two incommensurate crystal fields,
electrons are confined within individual sides of the interface, and scattered
by umklapp scattering of the crystal field from the other side. In addition,
the high strain on the rocksalt layer raises its chemical potential and induces
large charge transfer to the CoO$_{2}$ layer. Furthermore, a novel interface
effects, the interfacial enhancement of electron-phonon interactions, is
discovered. Our findings of these electronic properties lay a foundation for
designing future functional oxide interfaces.


title: Smooth Loops and Fiber Bundles: Theory of Principal Q-bundles

abstract:
  A nonassociative generalization of the principal fiber bundles with a smooth
loop mapping on the fiber is presented. Our approach allows us to construct a
new kind of gauge theories that involve higher ''nonassociative'' symmetries.


title: Steiner trees and spanning trees in six-pin soap films

abstract:
  We have studied the Steiner tree problem using six-pin soap films in detail.
We extend the existing method of experimental realisation of Steiner trees in
$n$-terminal problem through soap films to observe new non-minimal Steiner
trees. We also produced spanning tree configurations for the first time by our
method. Experimentally, by varying the pin diameter, we have achieved these new
stable soap film configurations. A new algorithm is presented for creating
these Steiner trees theoretically.
  Exact lengths of these Steiner tree configurations are calculated using a
geometrical method. An exact two-parameter empirical formula is proposed for
estimating the lengths of these soap film configurations in six-pin soap film
problem.


title:
Additional Comments on "New Limits on Spin-Independent Couplings of
  Low-Mass WIMP Dark Matter with a Germanium Detector at a Threshold of 200 eV"

abstract:
  In a previous comment (arXiv:0806.1341v1) we criticized purely technical
aspects of arXiv:0712.1645 but pointed out that many other inconsistencies were
readily apparent. In view of the imminent posting of another version of
arXiv:0712.1645, still containing these issues, we would like to offer with
this additional note a critical guide to the methodology followed by the TEXONO
collaboration, in their effort to extract dark matter limits from a spectral
region completely dominated by electronic noise. We find that systematics have
been neglected through a combination of erroneous assumptions and failure to
explore all of their possible sources.


title: The Crab Nebula's Composition and Precursor Star Mass

abstract:
  We present results of new photoionization calculations for investigating
gaseous regions that represent potentially expected stages of nuclear
processing in the Crab Nebula supernova remnant. In addition to gas resulting
from CNO-processing and oxygen-burning, as previously reported, a large
component of the nebula appears to be carbon-rich. These results suggest that
the precursor star had an initial mass of 9.5 solar masses or more.


title: Temporized Equilibria

abstract:
  This paper has been withdrawn by the author due to a crucial error in the
submission action.


title:
Primary role of the barely occupied states in the charge density wave
  formation of NbSe2

abstract:
  NbSe2 is a prototypical charge-density-wave (CDW) material, whose mechanism
remains mysterious so far. With angle resolved photoemission spectroscopy, we
mapped out the CDW gap and recovered the long-lost nesting condition over a
large broken-honeycomb region in the Brillouin zone, which consists of six
saddle band point regions with high density of states (DOS), and large regions
away from Fermi surface with negligible DOS at the Fermi energy. We show that
the major contributions to the CDW come from these barely occupied states
rather than the saddle band points. Our findings not only resolve a long
standing puzzle, but also overthrow the conventional wisdom that CDW is
dominated by regions with high DOS.


title: Asymptotics of Plancherel measures for $GL(n,q)$

abstract:
  We introduce the Plancherel measure on the set of partition collections,
which parameterize irreducible representations of order n general linear group
over a finite field. We prove that as n goes to infinity, the random partitions
from the random collections converge in finite dimencional distribution to
independent random variables. We give explicit formulas for the corresponding
limit distributions.


title: The Misleading Nature of the Leaky Box Models in Cosmic Ray Physics

abstract:
  Many experimental results around and above the energies where the solar
modulation affects cosmic ion fluxes were quantified, conceptualized and
debated using leaky box models. These models exploit the notion of equilibrium
between creation and destruction processes of cosmic ions in an
undifferentiated arbitrary volume representing the Galaxy, ignoring the
galactic magnetic field, the size of the Galaxy, the position of the solar
cavity, the spatial distribution of the sources, the space variation of the
interstellar matter and other pertinent observations. Progress in the
measurements of the quoted observational parameters rendes obsolete the use of
the leaky box models. Specific examples substantiating the inadequacy of the
leaky box models are analyzed such as the conversion of the boron-to-carbon
flux ratio into grammage and the residence times of cosmic ions in the Galaxy.
The unphysical and misleading nature of the leaky box models is ascertained and
illustrated at very high energy.


title: KPZ in one dimensional random geometry of multiplicative cascades

abstract:
  We prove a formula relating the Hausdorff dimension of a subset of the unit
interval and the Hausdorff dimension of the same set with respect to a random
path matric on the interval, which is generated using a multiplicative cascade.
When the random variables generating the cascade are exponentials of Gaussians,
the well known KPZ formula of Knizhnik, Polyakov and Zamolodchikov from quantum
gravity appears. This note was inspired by the recent work of Duplantier and
Sheffield proving a somewhat different version of the KPZ formula for Liouville
gravity. In contrast with the Liouville gravity setting, the one dimensional
multiplicative cascade framework facilitates the determination of the Hausdorff
dimension, rather than some expected box count dimension.


title: Classes of 3-regular graphs that are (7, 2)-edge-choosable

abstract:
  A graph is (7, 2)-edge-choosable if, for every assignment of lists of size 7
to the edges, it is possible to choose two colors for each edge from its list
so that no color is chosen for two incident edges. We show that every
3-edge-colorable graph is (7, 2)-edge-choosable and also that many
non-3-edge-colorable 3-regular graphs are (7, 2)-edge-choosable.


title:
3D binary anti-commutative operadic Lax representations for harmonic
  oscillator

abstract:
  It is explained how the time evolution of the operadic variables may be
introduced by using the operadic Lax equation. The operadic Lax representations
for the harmonic oscillator are constructed in 3-dimensional binary
anti-commutative algebras. As an example, an operadic Lax representation for
the harmonic oscillator in the Lie algebra sl(2) is constructed.


title: Slow decorrelations in KPZ growth

abstract:
  For stochastic growth models in the Kardar-Parisi-Zhang (KPZ) class in 1+1
dimensions, fluctuations grow as t^{1/3} during time t and the correlation
length at a fixed time scales as t^{2/3}. In this note we discuss the scale of
time correlations. For a representant of the KPZ class, the polynuclear growth
model, we show that the space-time is non-trivially fibred, having slow
directions with decorrelation exponent equal to 1 instead of the usual 2/3.
These directions are the characteristic curves of the PDE associated to the
surface's slope. As a consequence, previously proven results for space-like
paths will hold in the whole space-time except along the slow curves.

categories: math-ph cond-mat.stat-mech math.MP math.PR


title: Seshadri constants and surfaces of minimal degree

abstract:
  In "Seshadri fibrations of algebraic surfaces" [arXiv:0709.2592v1] we showed
that if the multiple point Seshadri constants of an ample line bundle on a
smooth projective surface in very general points satisfy certain inequality
then the surface is fibred by curves computing these constants. Here we
characterize the border case of polarized surfaces whose Seshadri constants in
general points fulfill the equality instead of inequality and which are not
fibred by Seshadri curves. It turns out that these surfaces are the projective
plane and surfaces of minimal degree.


title:
Comparative High Field Magneto-Transport of Rare Earth Oxypnictides with
  Maximum Transition Temperatures

abstract:
  The recent discovery of a new class of superconducting oxypnictides with high
transition temperatures may have profound implications for understanding
unconventional high-temperature superconductivity. Like the cuprates, the
oxypnictides seem to manifest an interleaving of charge donor and
superconducting layers emerging upon doping of an antiferromagnetic parent
semi-metal. Here we report magneto-transport measurements of three rare earth
(Re = La, Nd, Sm) oxypnicide compounds with the transition temperatures near
the maximum reported to date, in very high DC and pulsed magnetic fields up to
45 and 54 T, respectively. Our resistivity, Hall coefficient and critical
magnetic fields data suggest that these oxypnictide superconductors bridge the
gap between MgB$_2$ and YBaCu$_3$O$_{7-x}$ as far as electromagnetic and vortex
properties are concerned.


title:
Asymptotic Behavior of Solutions of a Free Boundary Problem Modelling
  the Growth of Tumors with Stokes Equations

abstract:
  We study a free boundary problem modelling the growth of non-necrotic tumors
with fluid-like tissues. The fluid velocity satisfies Stokes equations with a
source determined by the proliferation rate of tumor cells which depends on the
concentration of nutrients, subject to a boundary condition with stress tensor
effected by surface tension. It is easy to prove that this problem has a unique
radially symmetric stationary solution. By using a functional approach, we
prove that there exists a threshold value $\gamma_*>0$ for the surface tension
coefficient $\gamma$, such that in the case $\gamma>\gamma_*$ this radially
symmetric stationary solution is asymptotically stable under small non-radial
perturbations, whereas in the opposite case it is unstable.


title:
Analysis of the Effect of Speed Limit Increases on Accident-Injury
  Severities

abstract:
  The influence of speed limits on roadway safety has been a subject of
continuous debate in the State of Indiana and nationwide. In Indiana,
highway-related accidents result in about 900 fatalities and forty thousand
injuries annually and place an incredible social and economic burden on the
state. Still, speed limits posted on highways and other roads are routinely
exceeded as individual drivers try to balance safety, mobility (speed), and the
risks and penalties associated with law enforcement efforts. The
speed-limit/safety issue has been a matter of considerable concern in Indiana
since the state raised its speed limits on rural interstates and selected
multilane highways on July 1, 2005. In this paper, the influence of the posted
speed limit on the severity of vehicle accidents is studied using Indiana
accident data from 2004 (the year before speed limits were raised) and 2006
(the year after speed limits were raised on rural interstates and some
multi-lane non-interstate routes). Statistical models of the injury severity of
different types of accidents on various roadway classes were estimated. The
results of the model estimations showed that, for the speed limit ranges
currently used, speed limits did not have a statistically significant effect on
the severity of accidents on interstate highways. However, for some
non-interstate highways, higher speed limits were found to be associated with
higher accident severities - suggesting that future speed limit changes, on
non-interstate highways in particular, need to be carefully assessed on a
case-by-case basis.


title:
From a set of parts to an indivisible whole. Part III: Holistic space of
  multi-object relations

abstract:
  The previously described methodology for hierarchical grouping of objects
through iterative averaging has been used for simulation of cooperative
interactions between objects of a system with the purpose of investigation of
the conformational organization of the system. Interactions between objects
were analyzed within the space of an isotropic field of one of the objects
(drifter). Such an isotropic field of an individual object can be viewed as a
prototype of computer ego. It allows visualization of a holistic space of
multi-object relations (HSMOR) which has a complex structure depending on the
number of objects, their mutual arrangement in space, and the type of metric
used for assessment of (dis)similarities between the objects. In the course of
computer simulation of cooperative interactions between the objects, only those
points of the space were registered which corresponded to transitions in
hierarchical grouping. Such points appeared to aggregate into complex spatial
structures determining a unique internal organization of a respective HSMOR. We
describe some of the peculiarities of such structures, referred to by us as
attractor membranes, and discuss their properties. We also demonstrate the
peculiarities of the changing of intergroup similarities which occurs when a
drifter infinitely moves away from the fixed objects.


title: From Glasma to Quark Gluon Plasma in heavy ion collisions

abstract:
  When two sheets of Color Glass Condensate collide in a high energy heavy ion
collision, they form matter with very high energy densities called the Glasma.
We describe how this matter is formed, its remarkable properties and its
relevance for understanding thermalization of the Quark Gluon Plasma in heavy
ion collisions. Long range rapidity correlations contained in the near side
ridge measured in heavy ion collisions may allow one to directly infer the
properties of the Glasma.


title: Differentiable Categories, gerbes and G-structures

abstract:
  The theories of strings and $D$-branes have motivated the development of non
Abelian cohomology techniques in differential geometry, on the purpose to find
a geometric interpretation of characteristic classes. The spaces studied here,
like orbifolds are not often smooth. In classical differential geometry, non
smooth spaces appear also naturally, for example in the theory of foliations,
the space of leaves can be an orbifold with singularities. The scheme to study
these structures is identical: classical tools used in differential geometry,
like connections, curvature are adapted. The purpose of this paper is to
present the notion of differential category which unifies all these points of
view. This enables us to provide a geometric interpretation of 5-characteristic
classes, and to interpret classical problems which appear in the theory of
$G$-structures by using gerbes.


title:
Photometric study of selected cataclysmic variables II. Time-series
  photometry of nine systems

abstract:
  We present time-series photometry of nine cataclysmic variables: EI UMa,
V844Her, V751 Cyg, V516 Cyg, GZ Cnc, TY Psc, V1315 Aql, ASAS J002511+1217.12,
V1315 Aql and LN UMa. The observations were conducted at various observatories,
covering 170 hours and comprising 7,850 data points in total.
  For the majority of targets we confirm previously reported periodicities and
for some of them we give, for the first time, their spectroscopic orbital
periods. For those dwarf-nova systems which we observed during both quiescence
and outburst, the increase in brightness was followed by a decrease in the
amount of flickering. Quasi-periodic oscillations have either been discovered,
or were confirmed. For the eclipsing system V1315 Aql we have covered 9
eclipses, and obtained a refined orbital ephemeris. We find that, during its
long baseline of observations, no change in the orbital period of this system
has occurred. V1315 Aql also shows eclipses of variable depth.


title: Does the Higgs Mechanism Exist?

abstract:
  This paper explores the argument structure of the concept of spontaneous
symmetry breaking in the electroweak gauge theory of the Standard Model: the
so-called Higgs mechanism. As commonly understood, the Higgs argument is
designed to introduce the masses of the gauge bosons by a spontaneous breaking
of the gauge symmetry of an additional field, the Higgs field. The technical
derivation of the Higgs mechanism, however, consists in a mere re-shuffling of
degrees of freedom by transforming the Higgs Lagrangian in a gauge-invariant
manner. This already raises serious doubts about the adequacy of the entire
manoeuvre. It will be shown that no straightforward ontic interpretation of the
Higgs mechanism is tenable since gauge transformations possess no real
instantiations. In addition, the explanatory value of the Higgs argument will
be critically examined.


title:
Integrable generalizations of Schrodinger maps and Heisenberg spin
  models from Hamiltonian flows of curves and surfaces

abstract:
  A moving frame formulation of non-stretching geometric curve flows in
Euclidean space is used to derive a 1+1 dimensional hierarchy of integrable
SO(3)-invariant vector models containing the Heisenberg ferromagnetic spin
model as well as a model given by a spin-vector version of the mKdV equation.
These models describe a geometric realization of the NLS hierarchy of soliton
equations whose bi-Hamiltonian structure is shown to be encoded in the Frenet
equations of the moving frame. This derivation yields an explicit
bi-Hamiltonian structure, recursion operator, and constants of motion for each
model in the hierarchy. A generalization of these results to geometric surface
flows is presented, where the surfaces are non-stretching in one direction
while stretching in all transverse directions. Through the Frenet equations of
a moving frame, such surface flows are shown to encode a hierarchy of 2+1
dimensional integrable SO(3)-invariant vector models, along with their
bi-Hamiltonian structure, recursion operator, and constants of motion,
describing a geometric realization of 2+1 dimensional bi-Hamiltonian NLS and
mKdV soliton equations. Based on the well-known equivalence between the
Heisenberg model and the Schrodinger map equation in 1+1 dimensions, a
geometrical formulation of these hierarchies of 1+1 and 2+1 vector models is
given in terms of dynamical maps into the 2-sphere. In particular, this
formulation yields a new integrable generalization of the Schrodinger map
equation in 2+1 dimensions as well as a mKdV analog of this map equation
corresponding to the mKdV spin model in 1+1 and 2+1 dimensions.


title:
VPOET: Using a Distributed Collaborative Platform for Semantic Web
  Applications

abstract:
  This paper describes a distributed collaborative wiki-based platform that has
been designed to facilitate the development of Semantic Web applications. The
applications designed using this platform are able to build semantic data
through the cooperation of different developers and to exploit that semantic
data. The paper shows a practical case study on the application VPOET, and how
an application based on Google Gadgets has been designed to test VPOET and let
human users exploit the semantic data created. This practical example can be
used to show how different Semantic Web technologies can be integrated into a
particular Web application, and how the knowledge can be cooperatively
improved.


title:
Supercurrent transferring through c-axis cuprate Josephson junctions
  with thick normal-metal-bridge

abstract:
  With simple but exactly solvable model, we investigate the supercurrent
transferring through the c-axis cuprate superconductor-normal
metal-superconductor junctions with the clean normal metal much thicker than
its coherence length. It is shown that the supercurrent as a function of
thickness of the normal metal decreases much slower than the exponential
decaying expected by the proximity effect. The present result may account for
the giant proximity effect observed in the c-axis cuprate SNS junctions.


title:
Asymptotic Stability of Stationary Solutions of a Free Boundary Problem
  Modeling the Growth of Tumors with Fluid Tissues

abstract:
  This paper aims at proving asymptotic stability of the radial stationary
solution of a free boundary problem modeling the growth of nonnecrotic tumors
with fluid-like tissues. In a previous paper we considered the case where the
nutrient concentration $\sigma$ satisfies the stationary diffusion equation
$\Delta\sigma=f(\sigma)$, and proved that there exists a threshold value
$\gamma_*>0$ for the surface tension coefficient $\gamma$, such that the radial
stationary solution is asymptotically stable in case $\gamma>\gamma_*$, while
unstable in case $\gamma<\gamma_*$. In this paper we extend this result to the
case where $\sigma$ satisfies the non-stationary diffusion equation
$\epsln\partial_t\sigma=\Delta\sigma-f(\sigma)$. We prove that for the same
threshold value $\gamma_*$ as above, for every $\gamma>\gamma_*$ there is a
corresponding constant $\epsln_0(\gamma)>0$ such that for any
$0<\epsln<\epsln_0(\gamma)$ the radial stationary solution is asymptotically
stable with respect to small enough non-radial perturbations, while for
$0<\gamma<\gamma_*$ and $\epsln$ sufficiently small it is unstable under
non-radial perturbations.


title:
Isotriviality is equivalent to potential good reduction for
  endomorphisms of ${\mathbb P}^N$ over function fields

abstract:
  Let $K=k(C)$ be the function field of a complete nonsingular curve $C$ over
an arbitrary field $k$. The main result of this paper states that a morphism
$\phi:{\mathbb P}^N_K\to{\mathbb P}^N_K$ is isotrivial if and only if it has
potential good reduction at all places $v$ of $K$; this generalizes results of
Benedetto for polynomial maps on ${\mathbb P}^1_K$ and Baker for arbitrary
rational maps on ${\mathbb P}^1_K$. We offer two proofs: the first uses
algebraic geometry and geometric invariant theory, and it is new even in the
case N=1. The second proof uses non-archimedean analysis and dynamics, and it
more directly generalizes the proofs of Benedetto and Baker. We will also give
two applications. The first states that an endomorphism of ${\mathbb P}^N_K$ of
degree at least two is isotrivial if and only if it has an isotrivial iterate.
The second gives a dynamical criterion for whether (after base change) a
locally free coherent sheaf ${\mathcal E}$ of rank $N+1$ on $C$ decomposes as a
direct sum ${\mathcal L}\oplus...\oplus{\mathcal L}$ of $N+1$ copies of the
same invertible sheaf ${\mathcal L}$.


title:
Comment on "Problems in the derivations of the renormalization group
  equation for the low momentum nucleon interactions"

abstract:
  The criticisms in manuscript arXiv:0803.4371 do not change the
renormalization group equation for the "$\vlowk$" interaction nor do they
affect any results in the literature. Several other potentially misleading
statements about low-momentum interactions are also addressed.


title: New coupled quintessence cosmology

abstract:
  A component of dark energy has been recently proposed to explain the current
acceleration of the Universe. Unless some unknown symmetry in Nature prevents
or suppresses it, such a field may interact with the pressureless component of
dark matter, giving rise to the so-called models of coupled quintessence. In
this paper we propose a new cosmological scenario where radiation and baryons
are conserved, while the dark energy component is decaying into cold dark
matter (CDM). The dilution of CDM particles, attenuated with respect to the
usual $a^{-3}$ scaling due to the interacting process, is characterized by a
positive parameter $\epsilon$, whereas the dark energy satisfies the equation
of state $p_x=\omega \rho_x$ ($\omega < 0$). We carry out a joint statistical
analysis involving recent observations from type Ia supernovae, baryon acoustic
oscillation peak, and Cosmic Microwave Background shift parameter to check the
observational viability of the coupled quintessence scenario here proposed.


title: Dissipative effects from transport and viscous hydrodynamics

abstract:
  We compare 2->2 covariant transport theory and causal Israel-Stewart
hydrodynamics in 2+1D longitudinally boost invariant geometry with RHIC-like
initial conditions and a conformal e = 3p equation of state. The pressure
evolution in the center of the collision zone and the final differential
elliptic flow v2(pT) from the two theories agree remarkably well for a small
shear viscosity to entropy density ratio eta/s ~ 1/(4 pi), and also for a large
cross section sigma ~ 50 mb. A key to this agreement is keeping ALL terms in
the Israel-Stewart equations of motion. Our results indicate promising
prospects for the applicability of Israel-Stewart dissipative hydrodynamics at
RHIC, provided the shear viscosity of hot and dense quark-gluon matter is
indeed very small for the relevant temperatures T ~ 200-500 MeV.


title:
Application of B-splines to determining eigen-spectrum of Feshbach
  molecules

abstract:
  The B-spline basis set method is applied to determining the rovibrational
eigen-spectrum of diatomic molecules. A particular attention is paid to a
challenging numerical task of an accurate and efficient description of the
vibrational levels near the dissociation limit (halo-state and Feshbach
molecules). Advantages of using B-splines are highlighted by comparing the
performance of the method with that of the commonly-used discrete variable
representation (DVR) approach. Several model cases, including the Morse
potential and realistic potentials with 1/R^3 and 1/R^6 long-range dependence
of the internuclear separation are studied. We find that the B-spline method is
superior to the DVR approach and it is robust enough to properly describe the
Feshbach molecules. The developed numerical method is applied to studying the
universal relation of the energy of the last bound state to the scattering
length. We numerically illustrate the validity of the quantum-defect-theoretic
formulation of such a relation for a 1/R^6 potential.


title: Berry phase and quantum criticality in Yang--Baxter systems

abstract:
  Spin interaction Hamiltonians are obtained from the unitary Yang--Baxter
$\breve{R}$-matrix. Based on which, we study Berry phase and quantum
criticality in the Yang--Baxter systems.


title:
Instability of wormholes supported by a ghost scalar field. II.
  Nonlinear evolution

abstract:
  We analyze the nonlinear evolution of spherically symmetric wormhole
solutions coupled to a massless ghost scalar field using numerical methods. In
a previous article we have shown that static wormholes with these properties
are unstable with respect to linear perturbations. Here we show that depending
on the initial perturbation the wormholes either expand or decay to a
Schwarzschild black hole. We estimate the time scale of the expanding solutions
and the ones collapsing to a black hole and show that they are consistent in
the regime of small perturbations with those predicted from perturbation
theory. In the collapsing case, we also present a systematic study of the final
black hole horizon and discuss the possibility for a luminous signal to travel
from one universe to the other and back before the black hole forms. In the
expanding case, the wormholes seem to undergo an exponential expansion, at
least during the run time of our simulations.


title: Unranking permutations in transposition order and linear time

abstract:
  An algorithm is presented for unranking permutations in transposition order:
Given a seed s\in N, the algorithm produces a permutation P(s) that differs
from the permutation P(s+1) by the transposition of two elements.


title: Robust Cognitive Beamforming With Partial Channel State Information

abstract:
  This paper considers a spectrum sharing based cognitive radio (CR)
communication system, which consists of a secondary user (SU) having multiple
transmit antennas and a single receive antenna and a primary user (PU) having a
single receive antenna. The channel state information (CSI) on the link of the
SU is assumed to be perfectly known at the SU transmitter (SU-Tx). However, due
to loose cooperation between the SU and the PU, only partial CSI of the link
between the SU-Tx and the PU is available at the SU-Tx. With the partial CSI
and a prescribed transmit power constraint, our design objective is to
determine the transmit signal covariance matrix that maximizes the rate of the
SU while keeping the interference power to the PU below a threshold for all the
possible channel realization within an uncertainty set. This problem, termed
the robust cognitive beamforming problem, can be naturally formulated as a
semi-infinite programming (SIP) problem with infinitely many constraints. This
problem is first transformed into the second order cone programming (SOCP)
problem and then solved via a standard interior point algorithm. Then, an
analytical solution with much reduced complexity is developed from a geometric
perspective. It is shown that both algorithms obtain the same optimal solution.
Simulation examples are presented to validate the effectiveness of the proposed
algorithms.


title:
Global well-posedness for the $L^2$ critical Hartree equation on
  $\bbr^n$, $n\ge 3$

abstract:
  We consider the initial value problem for the L^2-critical defocusing Hartree
equation in R^n, n \ge 3. We show that the problem is globally well posed in
H^s(R^n) when 1>s> \frac{2(n-2)}{3n-4}$. We use the "I-method" combined with a
local in time Morawetz estimate for the smoothed out solution.


title:
Intensity-Dependent Enhancement of Saturable Absorption in PbS-Au4
  Nanohybrid Composites: Evidence for Resonant Energy Transfer by Auger
  Recombination

abstract:
  Intensity-dependent enhancement of saturable absorption in a film of PbS-Au4
nanohybrid composites has been observed by femtosecond time-resolved transient
absorption measurement at 780 nm. The nonlinear absorption coefficient of
saturable absorption in PbS-Au4 nanohybrid composites is found to be dependent
on excitation irradiance and it is determined to be -2.9 cm/GW at 78 GW/cm2, an
enhancement of nearly fourfold in comparison with that of pure PbS quantum dots
(QDs). The enhancement is attributed to excitation of surface plasmon by
resonant energy transfer between PbS QDs and Au nanoparticles through Auger
recombination.


title: Two Photon Distribution Amplitudes

abstract:
  The factorization of the amplitude of the process gamma* gamma -> gamma gamma
in the low energy and high photon virtuality region is demonstrated at the Born
order and in the leading logarithmic approximation. The leading order two
photon (generalized) distribution amplitudes exhibit a characteristic ln Q2
behaviour and obey new inhomogeneous evolution equations.


title:
First-principles studies for structural transitions in ordered phase of
  cubic approximant Cd6Ca

abstract:
  Recently low-temperature structural transition has been reported for complex
cubic compounds Cd6M (M=Ca, Yb, Y, rare earth) and it is believed that the
transition is due to orientational ordering of an atomic shell in the
icosahedral cluster in Cd6M. The first-principles electronic structure
calculations and structural relaxations are carried out to investigate
structures and orientational ordering of the innermost tetrahedral shell of the
icosahedral cluster in Cd6Ca. The very short interatomic distances in the
experimental average structures are relaxed and the innermost tetrahedral shell
of an almost regular shape is obtained. Three types of orientation for the
tetrahedral shell and eight different combinations of them for the clusters at
a vertex and body-centre of a cubic cell are obtained. A possible model
describing the orientational ordering at low temperatures or high pressures is
discussed.


title:
An Identity Based Strong Bi-Designated Verifier (t, n) Threshold Proxy
  Signature Scheme

abstract:
  Proxy signature schemes have been invented to delegate signing rights. The
paper proposes a new concept of Identify Based Strong Bi-Designated Verifier
threshold proxy signature (ID-SBDVTPS) schemes. Such scheme enables an original
signer to delegate the signature authority to a group of 'n' proxy signers with
the condition that 't' or more proxy signers can cooperatively sign messages on
behalf of the original signer and the signatures can only be verified by any
two designated verifiers and that they cannot convince anyone else of this
fact.


title: Hadamard Phylogenetic Methods and the n-taxon process

abstract:
  The Hadamard transform of \cite{Hendy89a, Hendy89} provides a way to work
with stochastic models for sequence evolution without having to deal with the
complications of tree space and the graphical structure of trees. Here we
demonstrate that the transform can be expressed in terms of the familiar
$\bP[\bt] = e^{\bQ[\bt]}$ formula for Markov chains. The key idea is to study
the evolution of vectors of states, one vector entry for each taxa; we call
this the $n$-taxon process. We derive transition probabilities for the process.
Significantly, the findings show that tree-based models are indeed in the
family of (multi-variate) exponential distributions.


title:
High-pT photon processes and the photon structure - results from HERA
  jet and prompt photon (photo)production

abstract:
  Many important QCD tests with jets and prompt photons have been performed
with the experiments H1 and ZEUS at the HERA ep collider. This contribution
focuses on results from jet and prompt photon photoproduction. In particular,
the concept of resolved photon interactions and various jet cross sections and
their sensitivity to the photon (and proton) PDFs will be discussed. In
addition, recent results from prompt photon production will be shown. Finally
results on multi-parton interactions and the underlying event will be
presented.


title: The ground state energy of the mean field spin glass model

abstract:
  From the study of a functional equation of Gibbs measures we calculate the
limiting free energy of the Sherrington-Kirkpatrick spin glass model at a
particular value of (low) temperature. This implies the following lower bound
for the ground state energy $\epsilon_0$ \[\epsilon_0\geq -0.7833\cdots,\]
close to the replica symmetry breaking and numerical simulations values.


title: Feedback Scheduling: An Event-Driven Paradigm

abstract:
  Embedded computing systems today increasingly feature resource constraints
and workload variability, which lead to uncertainty in resource availability.
This raises great challenges to software design and programming in multitasking
environments. In this paper, the emerging methodology of feedback scheduling is
introduced to address these challenges. As a closed-loop approach to resource
management, feedback scheduling promises to enhance the flexibility and
resource efficiency of various software programs through dynamically
distributing available resources among concurrent tasks based on feedback
information about the actual usage of the resources. With emphasis on the
behavioral design of feedback schedulers, we describe a general framework of
feedback scheduling in the context of real-time control applications. A simple
yet illustrative feedback scheduling algorithm is given. From a programming
perspective, we describe how to modify the implementation of control tasks to
facilitate the application of feedback scheduling. An event-driven paradigm
that combines time-triggered and event-triggered approaches is proposed for
programming of the feedback scheduler. Simulation results argue that the
proposed event-driven paradigm yields better performance than time-triggered
paradigm in dynamic environments where the workload varies irregularly and
unpredictably.


title:
Extra-auditory effects of noise in laboratory animals: the relationship
  between noise and sleep

abstract:
  Noise has both auditory and extra-auditory effects. Some of the most
deleterious extra-auditory effects of noise are those leading to sleep
disturbances. These disturbances seem to be related to both endogenous
(physical parameters) and exogenous (sex, age) factors of noise. Despite
correlative relations between noise level and awakenings, the scientific
community has not reached consensus regarding a specific action of these
factors on the different sleep stages. In animal research, 2 complementary main
fields of research exist. One is focused on the positive modulation of sleep by
repeated tone stimulation. The other concerns noise-related sleep disturbances.
The few studies that have investigated noise-related sleep disturbances suggest
the following conclusions. First, sleep disturbances are greater upon exposure
to environmental noise, whose frequency spectrum is characterized by high and
ultrasonic sounds, than white noise. Second, unpredictability and pattern of
noise events are responsible for extractions from both SWS and PS. Third,
chronic exposure to noise permanently reduces and fragments sleep. Finally, in
chronic noise exposure, an inter-individual variability in SWS deficits is
observed and correlated to a psychobiological profile related to an
incapability to face stressful situations. Based on results from other
research, acute noise-related sleep perturbations could result from an
imbalance in the sleep-wake cycle in favor of arousing ascending systems.
Chronic noise-related sleep disturbances may arise due to imbalance of the
sleep-wake cycle and malfunctioning of the hypothalamo-pituitary-adrenal axis
which may both contribute to the development of pathology.


title:
Uniform spectral estimates for families of Schrodinger operators with
  magnetic field of constant intensity and applications

abstract:
  The aim of this paper is to establish uniform estimates of the spectrum's
bottom of the Neumann realization of $(i\nabla+q\A)^2$ on a bounded open set
$\Om$ with smooth boundary when $|\nabla\times\A|=1$ and $q\to+\infty$. This
problem was motivated by a question occuring in the theory of liquid crystals
and appears also in superconductivity questions in large domains.


title: Coulomb oscillations in three-layer graphene nanostructures

abstract:
  We present transport measurements on a tunable three-layer graphene single
electron transistor (SET). The device consists of an etched three-layer
graphene flake with two narrow constrictions separating the island from source
and drain contacts. Three lateral graphene gates are used to electrostatically
tune the device. An individual three-layer graphene constriction has been
investigated separately showing a transport gap near the charge neutrality
point. The graphene tunneling barriers show a strongly nonmonotonic coupling as
function of gate voltage indicating the presence of localized states in the
constrictions. We show Coulomb oscillations and Coulomb diamond measurements
proving the functionality of the graphene SET. A charging energy of $\approx
0.6$ meV is extracted.


title:
Control-Scheduling Codesign: A Perspective on Integrating Control and
  Computing

abstract:
  Despite rapid evolution, embedded computing systems increasingly feature
resource constraints and workload uncertainties. To achieve much better system
performance in unpredictable environments than traditional design approaches, a
novel methodology, control-scheduling codesign, is emerging in the context of
integrating feedback control and real-time computing. The aim of this work is
to provide a better understanding of this emerging methodology and to spark new
interests and developments in both the control and computer science
communities. The state of the art of control-scheduling codesign is captured.
Relevant research efforts in the literature are discussed under two categories,
i.e., control of computing systems and codesign for control systems. Critical
open research issues on integrating control and computing are also outlined.


title:
High-resolution simulations of galaxy mergers: Resolving globular
  cluster formation

abstract:
  Massive star clusters observed in galaxy mergers are often suggested to be
progenitors of globular clusters. To study this hypothesis, we performed the
highest resolution simulation of a gas-rich galaxy merger so far. The formation
of massive star clusters of 10^5 to 10^7 Mo, triggered by the galaxy
interaction, is directly resolved in this model. We show that these clusters
are tightly bound structures with little net rotation, due to evolve into
compact long-lived stellar systems. Massive clusters formed in galaxy mergers
are thus robust candidates for progenitors of long-lived globular clusters. The
simulated cluster mass spectrum is consistent with theory and observations.
Tidal dwarf galaxies of 10^8-9 Mo can form at the same time, and appear to be
part of a different class of objects, being more extended and rotating.