title: Relatively Moving Systems in "True Transformations Relativity"

abstract:
  In this paper the physical systems consisting of relatively moving subsystems
are considered in the "true transformations relativity." It is found in a
manifestly covariant way that there is a second-order electric field outside
stationary current-carrying conductor. It is also found that there are opposite
charges on opposite sides of a square loop with current and these charges are
invariant charges.


title: Quantum Monte Carlo Method for Attractive Coulomb Potentials

abstract:
  Starting from an exact lower bound on the imaginary-time propagator, we
present a Path-Integral Quantum Monte Carlo method that can handle singular
attractive potentials. We illustrate the basic ideas of this Quantum Monte
Carlo algorithm by simulating the ground state of hydrogen and helium.


title:
Exact Enumeration of Two-Dimensional Closed Random Paths Using a DSP
  Processor

abstract:
  The aim of this paper is to show that Digital Signal Processors (DSPs) can be
used to efficiently implement complex algorithms. As an example we have chosen
the problem of enumerating closed two-dimensional random paths. An Evaluation
Module Board (EVM) for TMS320C6201 fixed-point processor is used. The algorithm
is implemented in hand-written parallel assembly language. Some techniques are
used to fit the algorithm to the parallel structure of the processor and also
to avoid Branch and Condition-Checking tasks. Common optimization methods are
also employed to improve the execution speed of the code. These methods are
shown to yield a good efficiency in using the maximum computation power of the
processor. We use these results to obtain the area distribution of the paths.


title:
Relativistically extended Blanchard recurrence relation for hydrogenic
  matrix elements

abstract:
  General recurrence relations for arbitrary non-diagonal, radial hydrogenic
matrix elements are derived in Dirac relativistic quantum mechanics. Our
approach is based on a generalization of the second hypervirial method
previously employed in the non-relativistic Schr\"odinger case. A relativistic
version of the Pasternack-Sternheimer relation is thence obtained in the
diagonal (i.e. total angular momentum and parity the same) case, from such
relation an expression for the relativistic virial theorem is deduced. To
contribute to the utility of the relations, explicit expressions for the radial
matrix elements of functions of the form $r^\lambda$ and $\beta r^\lambda$
---where $\beta$ is a Dirac matrix--- are presented.


title: Problems connected with electrons trajectory in separated atom

abstract:
  The time-dependent electromagnetic field can results both pair waves and pair
particles. It can be for mathematical relations between two functions with
identical argument and difference of phases equal to $\pi$. Two examples both
the opportunity of phase synchronism for different frequencies of at atom-field
interaction with known abnormal dispersion of refraction and the possible
trajectories for pair particles are considered.


title:
Fermat's principle and variational analysis of an optical model for
  light propagation exhibiting a critical radius

abstract:
  Fermat's principle and variational analysis is used to analyze the
trajectories of light propagating in a radially inhomogeneous medium with a
singularity in the center. It is found that the light trajectories are similar
to those around a black hole, in the sense that there exists a critical radius
within which the light cannot escape, but spirals into the singularity.


title: On a universal photonic tunnelling time

abstract:
  We consider photonic tunnelling through evanescent regions and obtain general
analytic expressions for the transit (phase) time $\tau$ (in the opaque barrier
limit) in order to study the recently proposed ``universality'' property
according to which $\tau$ is given by the reciprocal of the photon frequency.
We consider different physical phenomena (corresponding to performed
experiments) and show that such a property is only an approximation. In
particular we find that the ``correction'' factor is a constant term for total
internal reflection and quarter-wave photonic bandgap, while it is
frequency-dependent in the case of undersized waveguide and distributed Bragg
reflector. The comparison of our predictions with the experimental results
shows quite a good agreement with observations and reveals the range of
applicability of the approximated ``universality'' property.

categories: physics.optics hep-ph hep-th physics.gen-ph quant-ph


title: Codon Distributions in DNA

abstract:
  The codons, sixtyfour in number, are distributed over the coding parts of DNA
sequences. The distribution function is the plot of frequency-versus-rank of
the codons. These distributions are characterised by parameters that are almost
universal, i.e., gene independent. There is but a small part that depends on
the gene. We present the theory to calculate the universal (gene-independent)
part. The part that is gene-specific, however, has undetermined overlaps and
fluctuations.


title:
Three-potential formalism for the three-body scattering problem with
  attractive Coulomb interactions

abstract:
  A three-body scattering process in the presence of Coulomb interaction can be
decomposed formally into a two-body single channel, a two-body multichannel and
a genuine three-body scattering. The corresponding integral equations are
coupled Lippmann-Schwinger and Faddeev-Merkuriev integral equations. We solve
them by applying the Coulomb-Sturmian separable expansion method. We present
elastic scattering and reaction cross sections of the $e^++H$ system both below
and above the $H(n=2)$ threshold. We found excellent agreements with previous
calculations in most cases.


title: Harmonic generation in ring-shaped molecules

abstract:
  We study numerically the interaction between an intense circularly polarized
laser field and an electron moving in a potential which has a discrete
cylindrical symmetry with respect to the laser pulse propagation direction.
This setup serves as a simple model, e.g., for benzene and other aromatic
compounds. From general symmetry considerations, within a Floquet approach,
selection rules for the harmonic generation [O. Alon Phys. Rev. Lett. 80 3743
(1998)] have been derived recently. Instead, the results we present in this
paper have been obtained solving the time-dependent Schroedinger equation ab
initio for realistic pulse shapes. We find a rich structure which is not always
dominated by the laser harmonics.


title: On the Compatibility Between Physics and Intelligent Organisms

abstract:
  It has been commonly argued, on the basis of Goedel's theorem and related
mathematical results, that true artificial intelligence cannot exist. Penrose
has further deduced from the existence of human intelligence that fundamental
changes in physical theories are needed. I provide an elementary demonstration
that these deductions are mistaken.

categories: physics.bio-ph gr-qc hep-ph physics.gen-ph q-bio.OT


title: Aspects of the Structure of the QCD Radiation Field

abstract:
  We consider the classical radiative solution to the QCD (quantum
chromodynamics) dynamical equations and find trivial solutions similar to the
electrodynamic situation when one considers singlet (colorless) radiation
sources. We transpose the findings to quantum fields and identify radiation
from hadron (meson) sources with gluon packages of 3 (2) gluons. Invoking the
singlet character of the QCD matter and radiation field, we deduce that the
blank (singlet) gluon packages are the elementary building blocks of QCD
radiation, just as blank hadrons and mesons are the building blocks of baryon
matter. Colorlessness of the gluon packages suggests a possibly simpler
quasi-abelian behaviour, as far as linear superposition is involved, of the QCD
singlet radiation field.


title: On the thermocapillary motion of deformable droplets

abstract:
  In studies on Marangoni type motion of particles the surface tension is often
approximated as a linear function of temperature. For deformable particles in a
linear external temperature gradient far from the reference point this
approximation yields a negative surface tension which is physically
unrealistic. It is shown that H.Zhou and R.H.Davis J. Colloid Interface Sci.,
n.181,60,1996 presented calculation where the leading deformable drop moved
into a region of negative surface tension. With respect numerical studies the
restriction of the migration of two deformable drops is given in terms of the
drift time.


title: A Reconciliation of Collision Theory and Transition State Theory

abstract:
  A statistical-mechanical treatment of collision leads to a formal connection
with transition-state theory, suggesting that collision theory and
transition-state theory might be joined ultimately as a collision induced
transition state theory.


title:
Signatures of quantum-like chaos in spacing intervals of non-trivial
  Riemann zeta zeros and in turbulent fluid flows

abstract:
  The spacing intervals of adjacent Riemann zeta zeros(non-trivial) exhibit
fractal(irregular) fluctuations generic to dynamical systems in nature such as
fluid flows, heart beat patterns, stock market price index, etc., and are
associated with unpredictability or chaos. The power spectra of such fractal
space-time fluctuations exhibit universal inverse power law form and signify
long-range correlations, identified as self-organized criticality . A cell
dynamical system model developed by the author for turbulent fluid flows
provides a unique quantification for the observed power spectra in terms of the
statistical normal distribution, such that the variance represents the
statistical probability densities. Such a result that the additive amplitudes
of eddies when squared, represent the statistical probabilities is an observed
feature of the subatomic dynamics of quantum systems such as an electron or
photon. Self-organized criticality is therefore a signature of quantum-like
chaos in dynamical systems. The model concepts are applicable to all real
world(observed) and computed(mathematical model) dynamical systems.
  Continuous periodogram analyses of the fractal fluctuations of Riemann zeta
zero spacing intervals show that the power spectra follow the unique and
universal inverse power law form of the statistical normal distribution. The
Riemann zeta zeros therefore exhibit quantum-like chaos, the spacing intervals
of the zeros representing the energy(variance) level spacings of quantum-like
chaos inherent to dynamical systems in nature. The cell dynamical system model
is a general systems theory applicable to dynamical systems of all size scales.


title:
Extraction of Cs-137 by alcohol-water solvents from plants containing
  cardiac glycosides

abstract:
  As a result of nuclear power plant accidents, large areas receive radioactive
inputs of Cs-137. This cesium accumulates in herbs growing in such territories.
The problem is whether the herbs contaminated by radiocesium may be used as a
raw material for medicine. The answer depends on the amount of Cs-137
transfered from the contaminated raw material to the medicine. We have
presented new results of the transfer of Cs-137 from contaminated Digitalis
grandiflora Mill. and Convallaria majalis L. to medicine. We found that the
extraction of Cs-137 depends strongly on the hydrophilicity of the solvent. For
example 96.5%(vol.) ethyl alcohol extracts less Cs-137 (11.6%) than 40%(vol.)
ethyl alcohol or pure water (66.2%). The solubility of the cardiac glycosides
is inverse to the solubility of cesium, which may be of use in the
technological processes for manufacturing ecologically pure herbal medicine.

categories: physics.med-ph physics.bio-ph physics.chem-ph physics.soc-ph


title:
High-precision calculations of van der Waals coefficients for
  heteronuclear alkali-metal dimers

abstract:
  Van der Waals coefficients for the heteronuclear alkali-metal dimers of Li,
Na, K, Rb, Cs, and Fr are calculated using relativistic ab initio methods
augmented by high-precision experimental data. We argue that the uncertainties
in the coefficients are unlikely to exceed about 1%.


title: Two particle states, lepton mixing and oscillations

abstract:
  Discussions of lepton mixing and oscillations consider generally only flavor
oscillations of neutrinos and neglect the accompanying charged leptons. In
cases of experimental interest like pion or nuclear beta decay an oscillation
pattern is expected indeed only for neutrinos if only one of the two produced
particles is observed. We argue that flavor oscillations of neutrinos without
detecting the accompanying lepton is a peculiarity of the two-particle states
$|l\nu>$ produced in pion or nuclear beta decay. Generally, an oscillation
pattern is only found if both particles are detected. We discuss in a
pedagogical way how this distinction of the neutrinos arises, although on the
level of the Lagrangian lepton mixing does not single them out against charged
leptons. As examples, we discuss the difference between the state $|l\nu>$
produced by the decay of real $W$ boson and a $W$ originating from pion decay.


title: Two-photon absorption in potassium niobate

abstract:
  We report measurements of thermal self-locking of a Fabry-Perot cavity
containing a potassium niobate (KNbO3) crystal. We develop a method to
determine linear and nonlinear optical absorption coefficients in intracavity
crystals by detailed analysis of the transmission lineshapes. These lineshapes
are typical of optical bistability in thermally loaded cavities. For our
crystal, we determine the one-photon absorption coefficient at 846 nm to be
(0.0034 \pm 0.0022) per m and the two-photon absorption coefficient at 846 nm
to be (3.2 \pm 0.5) \times 10^{-11} m/W and the one-photon absorption
coefficient at 423 nm to be (13 \pm 2) per m. We also address the issue of
blue-light-induced-infrared-absorption (BLIIRA), and determine a coefficient
for this excited state absorption process. Our method is particularly well
suited to bulk absorption measurements where absorption is small compared to
scattering. We also report new measurements of the temperature dependence of
the index of refraction at 846 nm, and compare to values in the literature.


title: Planar Waveguide Hybrids for Very High Power RF

abstract:
  Two basic designs have been developed for waveguide hybrids, or 3-dB
couplers, capable of handling hundreds of megawatts at X-band. Coupling is
provided by one or two connecting waveguides with h-plane junctions and
matching elements. In the former case, the connecting waveguide supports two
modes. Small apertures and field-enhancing e-bends are avoided to reduce the
risk of rf breakdown. The h-plane symmetry also allows the use of over-moded
rectangular waveguide in which the height has been increased to reduce field
amplitudes without affecting the scattering matrix. The theory and designs are
presented, along with the results of prototype tests of functionality and
power-handling capability. Such a device is integral to the rf pulse
compression or power distribution system of the Next Linear Collider (NLC) for
combining, splitting, and directing power. This work was motivated by the
observation of rf breakdown at power levels above 200 MW in conventional and
modified magic-T's.


title:
A Compact, Planar, Eight-Port Waveguide Power Divider/Combiner: The
  Cross Potent Superhybrid

abstract:
  In this letter, we present a novel four-way divider/combiner in rectangular
waveguide. The design is completely two-dimensional in the h-plane, with
eight-fold mirror symmetry, and is based on a recent four-port hybrid design
[6]. In combining mode, it can function as a phased array with four inputs and
four outputs. The planar nature of this design provides advantages, such as the
freedom to increase the waveguide height beyond the over-moding limit in order
to reduce field strengths. Along with its open geometry, this makes it ideal
for high-power applications where rf break down is a concern. Design criteria,
field-solver simulation results, and prototype measurements are presented.


title:
A walk in the parameter space of L-H transitions without stepping on or
  through the cracks

abstract:
  A mathematically and physically sound three-degree-of-freedom dynamical model
that emulates low- to high-confinement mode (L--H) transitions is elicited from
a singularity theory critique of earlier fragile models. We construct a smooth
map of the parameter space that is consistent both with the requirements of
singularity theory and with the physics of the process. The model is found to
contain two codimension 2 organizing centers and two Hopf bifurcations, which
underlie dynamical behavior that has been observed around L-H transitions but
not mirrored in previous models. The smooth traversal of parameter space
provided by this analysis gives qualitative guidelines for controlling access
to H-mode and oscillatory regimes.


title: Hot Points of the Wave Universe Concept: New World of Megaquantization

abstract:
  We present the brief review of some central problems, anomalies, paradoxes of
Astrophysics, Cosmology and new approaches to its decisions, proposed by the
Wave Universe Concept (WU Concept). All these, anyhow, - Hot Points of modern
science of Universe, about which Standard Model have not authentic answers. The
represented set of brief (justified) Novels reflects very perspective
directions of search. Essential from thems - Headline (and Topics): New
Phenomenon-Megaquantization: Observed Megaquantum Effects in Astronimical
Systems. Internal Structure of Celestial Bodies and Sun. Where is disposes the
Convective Zone? Towards to Stars: Where the Heliopause will be found? Mystery
of the Fine Structure Constant (FSC). Answer of the WU Concept: Theoretical
Representation of the Fine Structure Constant. FSC - As Micro and Mega
Parameter of the Universe. FSC, Orbits, Heliopause. What Quasars with Record
Redshifts will be discovered in Future? Observed Universe: Monotonic
Homogeneity and Anisotropy or Principal Hierarchy? Is the (Large - Scale) Limit
of Universe exist? All answers, proposed by the Wave Universe Concept, in
contrast with speculative schemes of Standard Model, are effectively verified
by experience, including, - and by justified in observations prognoses. It will
be waited, that namely here it is possible the real break in the understanding
of these principal problems and enigmas, which Nature, infinite Universe offers
(to us).


title:
Equilibrium sizes of jellium metal clusters in the stabilized
  spin-polarized jellium model

abstract:
  We have used the stabilized spin-polarized jellium model to calculate the
equilibrium sizes of metal clusters. Our self-consistent calculations in the
local spin-density approximation show that for an $N$-electron cluster, the
equilibrium is achieved for a configuration in which the difference in the
numbers of up-spin and down-spin electrons is zero or unity, depending on the
total number of electrons. That is, a configuration in which the spins are
maximally compensated. This maximum spin-compensation results in both the
alternation in the average distance between the nearest neighbor ions and the
odd-even alternations in the ionization energies of alkali metal clusters, in a
good agreement with the molecular dynamics findings and the experiment. These
suggest a realistic and more accurate method for calculating the properties of
metal clusters in the context of jellium model than previous jellium model
methods.


title:
On the physical nature of the photon mixing processes in nonlinear
  optics

abstract:
  The physical nature of the photon mixing and photon echo processes is
discussed on the basis of inequality of the forward and backward optical
transitions.


title: The Legality of Wind and Altitude Assisted Performances in the Sprints

abstract:
  Based on a mathematical simulation which reproduces accurate split and
velocity profiles for the 100 and 200 metre sprints, the magnitudes of altitude
and mixed wind/altitude-assisted performances as compared to their sea-level
equivalents are presented. It is shown that altitude-assisted times for the 200
metre are significantly higher than for the 100 metre, suggesting that the
``legality'' of such marks perhaps be reconsidered.


title: Coherent structures in a turbulent environment

abstract:
  A systematic method is proposed for the determination of the statistical
properties of a field consisting of a coherent structure interacting with
turbulent linear waves. The explicit expression of the generating functional of
the correlations is obtained, performing the functional integration on a
neighbourhood in the function space around the soliton. The results show that
the non-gaussian fluctuations observed in the tokamak plasma edge can be
explained by the intermittent formation of nonlinear coherent structures.


title:
Quasilinearization Approach to Nonlinear Problems in Physics with
  Application to Nonlinear ODEs

abstract:
  The general conditions under which the quadratic, uniform and monotonic
convergence in the quasilinearization method of solving nonlinear ordinary
differential equations could be proved are formulated and elaborated. The
generalization of the proof to partial differential equations is straight
forward. The method, whose mathematical basis in physics was discussed recently
by one of the present authors (VBM), approximates the solution of a nonlinear
differential equation by treating the nonlinear terms as a perturbation about
the linear ones, and unlike perturbation theories is not based on the existence
of some kind of a small parameter.
  It is shown that the quasilinearization method gives excellent results when
applied to different nonlinear ordinary differential equations in physics, such
as the Blasius, Duffing, Lane-Emden and Thomas-Fermi equations. The first few
quasilinear iterations already provide extremely accurate and numerically
stable answers.


title: Physical Interpretation of the 26 Dimensions of Bosonic String Theory

abstract:
  The 26 dimensions of Closed Unoriented Bosonic String Theory are interpreted
as the 26 dimensions of the traceless Jordan algebra J3(O)o of 3x3 Octonionic
matrices, with each of the 3 Octonionic dimenisons of J3(O)o having the
following physical interpretation: 4-dimensional physical spacetime plus
4-dimensional internal symmetry space; 8 first-generation fermion particles; 8
first-generation fermion anti-particles. This interpretation is consistent with
interpreting the strings as World Lines of the Worlds of Many-Worlds Quantum
Theory and the 26 dimensions as the degrees of freedom of the Worlds of the
Many-Worlds.


title: Statistical Approach to Gene Evolution

abstract:
  The evolution in coding DNA sequences brings new flexibility and freedom to
the codon words, even as the underlying nucleotides get significantly ordered.
These curious contra-rules of gene organisation are observed from the
distribution of words and the second moments of the nucleotide letters. These
statistical data give us the physics behind the classification of bacteria.


title:
Optimality of the genetic code with respect to protein stability and
  amino acid frequencies

abstract:
  How robust is the natural genetic code with respect to mistranslation errors?
It has long been known that the genetic code is very efficient in limiting the
effect of point mutation. A misread codon will commonly code either for the
same amino acid or for a similar one in terms of its biochemical properties, so
the structure and function of the coded protein remain relatively unaltered.
Previous studies have attempted to address this question more quantitatively,
namely by statistically estimating the fraction of randomly generated codes
that do better than the genetic code regarding its overall robustness. In this
paper, we extend these results by investigating the role of amino acid
frequencies in the optimality of the genetic code. When measuring the relative
fitness of the natural code with respect to a random code, it is indeed natural
to assume that a translation error affecting a frequent amino acid is less
favorable than that of a rare one, at equal mutation cost. We find that taking
the amino acid frequency into account accordingly decreases the fraction of
random codes that beat the natural code, making the latter comparatively even
more robust. This effect is particularly pronounced when more refined measures
of the amino acid substitution cost are used than hydrophobicity. To show this,
we devise a new cost function by evaluating with computer experiments the
change in folding free energy caused by all possible single-site mutations in a
set of known protein structures. With this cost function, we estimate that of
the order of one random code out of 100 millions is more fit than the natural
code when taking amino acid frequencies into account. The genetic code seems
therefore structured so as to minimize the consequences of translation errors
on the 3D structure and stability of proteins.


title:
Some exact analytical results and a semi-empirical formula for single
  electron ionization induced by ultrarelativistic heavy ions

abstract:
  The delta function gauge of the electromagnetic potential allows
semiclassical formulas to be obtained for the probability of exciting a single
electron out of the ground state in an ultrarelativistic heavy ion reaction.
Exact formulas have been obtained in the limits of zero impact parameter and
large, perturbative, impact parameter. The perturbative impact parameter result
can be exploited to obtain a semi-empirical cross section formula of the form,
sigma = A ln(gamma) + B, for single electron ionization. A and B can be
evaluated for any combination of target and projectile, and the resulting
simple formula is good at all ultrarelativistic energies. The analytical form
of A and B elucidates a result previously found in numerical calculations:
scaled ionization cross sections decrease with increasing charge of the nucleus
being ionized. The cross section values obtained from the present formula are
in good agreement with recent CERN SPS data from a Pb beam on various nuclear
targets.


title:
Ablation of solids by femtosecond lasers: ablation mechanism and
  ablation thresholds for metals and dielectrics

abstract:
  The mechanism of ablation of solids by intense femtosecond laser pulses is
described in an explicit analytical form. It is shown that at high intensities
when the ionization of the target material is complete before the end of the
pulse, the ablation mechanism is the same for both metals and dielectrics. The
physics of this new ablation regime involves ion acceleration in the
electrostatic field caused by charge separation created by energetic electrons
escaping from the target. The formulae for ablation thresholds and ablation
rates for metals and dielectrics, combining the laser and target parameters,
are derived and compared to experimental data. The calculated dependence of the
ablation thresholds on the pulse duration is in agreement with the experimental
data in a femtosecond range, and it is linked to the dependence for nanosecond
pulses.


title: Complex Numbers and Physical Reality

abstract:
  Some aspects of the development of physics and the mathematics set one think
about relation between complex numbers and reality around us. If number to spot
as the relation of two quantities, from the fact of existence of complex
numbers and accepted definition of number it is necessary necessity complex
value to assign to all physical quantities. The basic property of quantity to
be it is more or less, therefore field of complex quantities, if it exists, it
is necessary is ranked.
  The hypothesis was proposed that lexicographic ordering may be applied to the
complex physical quantities. A set of the ranked complex numbers is quite
natural to arrange on a straight line that represents in this case a
non-Archimedean complex numerical axis. All physical quantities are located on
the relevant non-Archimedean complex numerical axes, forming a new reality -
"complex-valued" world.
  Thus, we get the conclusion that the resulting non-Archimedean complex
numerical axis may serve as an example of the ideal mathematical object -
hyperreal numerical axis. So, differentiation and integration on the
non-Archimedean complex numerical axis can be realized using methods of
nonstandard analysis.
  Certain properties of a new "complex-valued" reality, its connection with our
"real" world and possibility of experimental detection of complex physical
quantities are discussed.


title: Self-Organizing Approach for Finding Borders of DNA Coding Regions

abstract:
  A self-organizing approach is proposed for gene finding based on the model of
codon usage for coding regions and positional preference for noncoding regions.
The symmetry between the direct and reverse coding regions is adopted for
reducing the number of parameters. Without requiring prior training, parameters
are estimated by iteration. By employing the window sliding technique and
likelihood ratio, a very accurate segmentation is obtained.


title: Implementation of analytical Hartree-Fock gradients for periodic systems

abstract:
  We describe the implementation of analytical Hartree-Fock gradients for
periodic systems in the code CRYSTAL, emphasizing the technical aspects of this
task. The code is now capable of calculating analytical derivatives with
respect to nuclear coordinates for systems periodic in 0, 1, 2 and 3 dimensions
(i.e. molecules, polymers, slabs and solids). Both closed-shell restricted and
unrestricted Hartree-Fock gradients have been implemented. A comparison with
numerical derivatives shows that the forces are highly accurate.


title: Coherent Radiation of Crystalline Beams

abstract:
  Crystallization and radiation of accelerator beams is considered. For the
first time it is shown that crystallization conditions for charged particle
beams differs from those of plasma. Crystallization conditions of charged
relativistic bunches are found and shown that they may be satisfies in existing
linacs. The coherence radiation of crystalline beams in the XUV region is
investigated. Necessary conditions of coherency are found. The influence of
deviations from mean interparticle distance on the radiation coherency is
considered.


title: String Theory: An Evaluation

abstract:
  A polemical article evaluating string theory from the point of view of a
quantum field theorist working in a mathematics department. Comments to the
author are encouraged.


title:
A simple Solvable Model of Body Motion in a One-dimensional Resistive
  Medium

abstract:
  We introduce and solve in closed form a simple model of a macroscopic body
propagating in a one-dimensional resistive medium at temperature T. The
assumption of completely inelastic collisions between the body and the
particles composing the medium leads to a resistive force that is opposite and
proportional to the square of the body's velocity


title: The attractive nonlinear delta-function potential

abstract:
  We solve the continuous one-dimensional Schr\"{o}dinger equation for the case
of an inverted {\em nonlinear} delta-function potential located at the origin,
obtaining the bound state in closed form as a function of the nonlinear
exponent. The bound state probability profile decays exponentially away from
the origin, with a profile width that increases monotonically with the
nonlinear exponent, becoming an almost completely extended state when this
approaches two. At an exponent value of two, the bound state suffers a
discontinuous change to a delta-like profile. Further increase of the exponent
increases again the width of the probability profile, although the bound state
is proven to be stable only for exponents below two. The transmission of plane
waves across the nonlinear delta potential increases monotonically with the
nonlinearity exponent and is insensitive to the sign of its opacity.


title: Exact zero-energy solution for a new family of Anharmonic Potentials

abstract:
  An explicit, oscillatory solution of the type r = [A + B sin(wt)]exp(a) is
found for the zero-energy one-dimensional motion of a particle under a specific
family of anharmonic potentials. We present a new parametric family of
anharmonic potentials for which one is able to obtain closed analytical
solutions for the trajectories of zero-energy.


title: Mathematics of Structure-Function Equations of All Orders

abstract:
  Exact equations are derived that relate velocity structure functions of
arbitrary order with other statistics. "Exact" means that no approximations are
used except that the Navier-Stokes equation and incompressibility condition are
assumed to be accurate. The exact equations are used to determine the
structure-function equations of all orders for locally homogeneous but
anisotropic turbulence as well as for the locally isotropic case. These
equations can be used for investigating the approach to local homogeneity and
to local isotropy as well as the balance of the equations and identification of
scaling ranges.


title: Alternative to R_lambda-scaling of Small-Scale Turbulence Statistics

abstract:
  Traditionally, trends of universal turbulence statistics are presented versus
R-lambda, which is the Reynolds number based on Taylor's scale, lambda, and the
root-mean-squared (rms) velocity component, u'. Taylor's scale and u', and
hence R-lambda, do not have the attribute of universality. The ratio of rms
fluid-particle acceleration to rms viscous acceleration is an alternative to
R-lambda which has the advantage of being determined by the small scales of
turbulence. This ratio, denoted R-a, has the following attributes: it is a
Reynolds number, it is composed of statistics of the small scales of
turbulence, it can be evaluated with single-wire hot-wire anemometry, and like
R-lambda, can be partially evaluated by means of flow similarity. For isotropic
turbulence the relationship between R-a and R-lambda is shown. Velocity
derivative flatness measured between counter-rotating blades appears monotonic
when graphed versus R-a, unlike when graphed versus R-lambda.


title: Large Scale Quantization and the Puzzling Cosmological Problems

abstract:
  We have investigated the implications of Quantum Mechanics to macroscopic
scale. Evaporation of Black Holes and evolution of pulsars may be one of the
consequences of this conjecture. The two equations GM=Rc^2 and GM^2=hc where R
and M are the radius and the mass of the universe, are governing the evolution
of the universe throughout its entire cosmic expansion, provided that the
appropriate Planck constant is chosen. The existence of very large values of
physical quantities are found to be due to cosmic quantization. We predict a
constant residual acceleration of the order 10^{-7}cm s^{-2} acting on all
objects at the present time.


title: Velocity field distributions due to ideal line vortices

abstract:
  We evaluate numerically the velocity field distributions produced by a
bounded, two-dimensional fluid model consisting of a collection of parallel
ideal line vortices. We sample at many spatial points inside a rigid circular
boundary. We focus on ``nearest neighbor'' contributions that result from
vortices that fall (randomly) very close to the spatial points where the
velocity is being sampled. We confirm that these events lead to a non-Gaussian
high-velocity ``tail'' on an otherwise Gaussian distribution function for the
Eulerian velocity field. We also investigate the behavior of distributions that
do not have equilibrium mean-field probability distributions that are uniform
inside the circle, but instead correspond to both higher and lower mean-field
energies than those associated with the uniform vorticity distribution. We find
substantial differences between these and the uniform case.


title: The coherent dynamics of photoexcited green fluorescent proteins

abstract:
  The coherent dynamics of vibronic wave packets in the green fluorescent
protein is reported. At room temperature the non-stationary dynamics following
impulsive photoexcitation displays an oscillating optical transmissivity
pattern with components at 67 fs (497 cm-1) and 59 fs (593 cm-1). Our results
are complemented by ab initio calculations of the vibrational spectrum of the
chromophore. This analysis shows the interplay between the dynamics of the
aminoacidic structure and the electronic excitation in the primary optical
events of green fluorescent proteins.


title: Novel Mechanism for Single Bubble Sonoluminescence

abstract:
  Careful re-examination of typical experimental data made it possible to show
that the UV continua observed in multi-bubble (MBSL) and single-bubble (SBSL)
sonoluminescence spectra have the same physical nature - radiative dissociation
of electronically excited hydrogen molecules [and probably hydrides of heavy
rare gases like ArH*] due to spontaneous transitions between bound and
repulsive electronic states. The proposed mechanism is able to explain all
available spectroscopic observations without any exotic hypothesis but in terms
usual for plasma spectroscopy.


title: On Superluminal Propagation and Information Velocity

abstract:
  This paper examines some of the recent experiments on superluminal
propagation. It is well known that Sommerfeld and Brillouin analyzed a
rectangular sinusoidal signal propagating through a dispersive medium and
derived expressions to describe the precursors and the main signal. In this
paper, the impulse response of this dispersive medium is derived as exact
expression using Taylor series expansion and output signal for any causal input
signal is shown to be zero for time $t$ less than vaccum transit time and
implications for superluminal information velocity is analyzed.


title: Does Recycling in Germinal Centers Exist?

abstract:
  A general criterion is formulated in order to decide if recycling of B-cells
exists in GC reactions. The criterion is independent of the selection and
affinity maturation process and based solely on total centroblast population
arguments. An experimental test is proposed to verify whether the criterion is
fulfilled.


title: Equations relating structure functions of all orders

abstract:
  The hierarchy of exact equations is given that relates two-spatial-point
velocity structure functions of arbitrary order with other statistics. Because
no assumption is used, the exact statistical equations can apply to any flow
for which the Navier-Stokes equations are accurate, and they apply no matter
how small the number of samples in the ensemble. The exact statistical
equations can be used to verify DNS computations and to detect their
limitations. For example,if DNS data are used to evaluate the exact statistical
equations, then the equations should balance to within numerical precision,
otherwise a computational problem is indicated. The equations allow
quantification of the approach to local homogeneity and to local isotropy.
Testing the balance of the equations allows detection of scaling ranges for
quantification of scaling-range exponents. The second-order equations lead to
Kolmogorov's equation. All higher-order equations contain a statistic composed
of one factor of the two-point difference of the pressure gradient multiplied
by factors of velocity difference. Investigation of this
pressure-gradient-difference statistic can reveal much about two issues: 1)
whether or not different components of the velocity structure function of given
order have differing exponents in the inertial range, and 2) the increasing
deviation of those exponents from Kolmogorov scaling as the order increases.
Full disclosure of the mathematical methods is in
xxx.lanl.gov/list/physics.flu-dyn/0102055.


title:
Quantum Ground State and Minimum Emittance of a Fermionic Particle Beam
  in a Circular Accelerator

abstract:
  In the usual parameter regime of accelerator physics, particle ensembles can
be treated as classical. If we approach a regime where
$\epsilon_x\epsilon_y\epsilon_s \approx N_{particles}\lambda_{Compton}^3\$,
however, the granular structure of quantum-mechanical phase space becomes a
concern. In particular, we have to consider the Pauli exclusion principle,
which will limit the minimum achievable emittance for a beam of fermions. We
calculate these lowest emittances for the cases of bunched and coasting beams
at zero temperature and their first-order change rate at finite temperature.


title:
Strong "quantum" chaos in the global ballooning mode spectrum of
  three-dimensional plasmas

abstract:
  The spectrum of ideal magnetohydrodynamic (MHD) pressure-driven (ballooning)
modes in strongly nonaxisymmetric toroidal systems is difficult to analyze
numerically owing to the singular nature of ideal MHD caused by lack of an
inherent scale length. In this paper, ideal MHD is regularized by using a
$k$-space cutoff, making the ray tracing for the WKB ballooning formalism a
chaotic Hamiltonian billiard problem. The minimum width of the toroidal Fourier
spectrum needed for resolving toroidally localized ballooning modes with a
global eigenvalue code is estimated from the Weyl formula. This
phase-space-volume estimation method is applied to two stellarator cases.


title:
A simple iterative algorithm for generating selected eigenspaces of
  large matrices

abstract:
  We propose a new iterative algorithm for generating a subset of eigenvalues
and eigenvectors of large matrices which generalizes the method of optimal
relaxations. We also give convergence criteria for the iterative process,
investigate its efficiency by evaluating computer storage and time requirements
and by a few numerical tests.


title: Quasi-quantization of writhe in ideal knots

abstract:
  The values of writhe of the most tight conformations, found by the SONO
algorithm, of all alternating prime knots with up to 10 crossings are analysed.
The distribution of the writhe values is shown to be concentrated around the
equally spaced levels. As predicted by Cerf and Stasiak the writhe quantum is
shown to be close to the rational 4/7 value. The deviation of the writhe values
from the n*(4/7) writhe levels scheme is analysed quantitatively. Consequences
of the writhe quantization phenomenon are discussed.


title: Thermalization of magnetically trapped metastable helium

abstract:
  We have observed thermalization by elastic collisions of magnetically trapped
metastable helium atoms. Our method directly samples the reconstruction of a
thermal energy distribution after the application of an RF knife. The
relaxation time of our sample towards equilibrium gives an elastic collision
rate constant close to the unitarity limit.


title: Trial function optimization for excited states of van der Waals clusters

abstract:
  A method is introduced to optimize excited state trial wave functions. The
method is applied to ground and vibrationally excited states of bosonic van der
Waals clusters of upto seven particles. Employing optimized trial wavefunctions
with three-body correlations, we use correlation function Monte Carlo to
estimate the corresponding excited state energies.


title:
High-precision calculations of electric-dipole amplitudes for
  transitions between low-lying levels of Mg, Ca, and Sr

abstract:
  To support efforts on cooling and trapping of alkaline-earth atoms and
designs of atomic clocks, we performed ab initio relativistic many-body
calculations of electric-dipole transition amplitudes between low-lying states
of Mg, Ca, and Sr. In particular, we report amplitudes for ^1P_1 --> ^1S_0,
^3S_1, ^1D_2$, for ^3P_1 --> ^1S_0, ^1D_2, and for ^3P_2 --> ^1D_2 transitions.
For Ca, the reduced matrix element <4s4p, ^1P_1 ||D|| 4s^2, ^1S_0> is in a good
agreement with a high-precision experimental value deduced from
photoassociation spectroscopy [Zinner et al., Phys.Rev.Lett., v.85, 2292
(2000)]. An estimated uncertainty of the calculated lifetime of the (3s3p
^1P_1) state of Mg is a factor of three smaller than that of the most accurate
experiment. Calculated binding energies reproduce experimental values within
0.1-0.2%.


title: Electron mobility maximum in dense argon gas at low temperature

abstract:
  We report measurements of excess electron mobility in dense Argon gas at the
two temperatures $T=152.15$ and 162.30 K, fairly close to the critical one
($T_c =150.7$ K), as a function of the gas density $N$ up to 14
atoms$\cdot$nm$^{-3}$ ($N_{c}=8.08$ atoms$\cdot$nm$^{-3}$). For the first time
a maximum of the zero-field density-normalized mobility $\mu_{0}N$ has been
observed at the same density where it was detected in liquid Argon under
saturated vapor pressure conditions. The existence of the $\mu_{0}N$ maximum in
the liquid is commonly attributed to electrons scattering off long-wavelength
collective modes of the fluid, while for the low-density gas a density-modified
kinetic model is valid. The presence of the $\mu_{0}N$ maximum also in the gas
phase raises therefore the question whether the single scattering picture valid
in the gas is valid even at liquid densities.


title:
Interaction of two deformable viscous drops under external temperature
  gradient

abstract:
  The axisymmetric deformation and motion of interacting droplets in an imposed
temperature gradient is considered using boundary-integral techniques for slow
viscous motion. Results showing temporal drop motion, deformations and
separation are presented for equal-viscosity fluids. The focus is on cases when
the drops are of equal radii or when the smaller drop trails behind the larger
drop. For equal-size drops, our analysis shows that the motion of a leading
drop is retarded while the motion of the trailing one is enchanced compared to
the undeformable case. The distance between the centers of equal-sized
deformable drops decreases with time. When a small drop follows a large one,
two patterns of behavior may exist. For moderate or large initial separation
the drops separate. However, if the initial separation is small there is a
transient period in which the separation distance initially decreases and only
afterwards the drops separate. This behavior stems from the multiple time
scales that exist in the system.


title:
The direction of Coulomb's force and the direction of gravitational
  force in the 4-dimensional space-time

abstract:
  In this paper, we point out that the 4-vector force acting on a particle is
always in the direction orthogonal to the 4-vector velocity of the particle in
the 4-dimensional space-time, rather than along the line joining the particle
and the action source. This inference is obviously supported from the fact that
the magnitude of the 4-vector velocity is a constant. This orthogonality brings
out many new aspects for force concept. In this paper it is found that the
Maxwell's equations can be derived from classical Coulomb's force and the
orthogonality, some gravitational effects such as the perihelion advance of
planet can also be explained in terms of the orthogonality.


title:
Effective theory of systems coupled strongly to rapidly-varying external
  sources

abstract:
  We consider quantum systems which interact strongly with a rapidly varying
environment and derive a Schrodinger-like equation which describes the time
evolution of the average wave function. We show that the corresponding
Hamiltonian can be taken to be Hermitian provided all states are rotated using
an appropriate unitary transformation. The formalism is applied to a variety of
systems and is compared and contrasted with related results describing
stochastic resonances.


title:
Molecular dynamics simulation for pressure-induced structural transition
  from C$_{60}$ fullerene into amorphous diamond

abstract:
  The pressure-induced structural transition in fcc C$_{60}$ fullerene by shock
compression and rapid quenching is investigated by a semi-empirical
tight-binding molecular dynamics simulation, adopting a constant-pressure
scheme and a method of the order N electronic structure calculation. At first,
the process of the amorphization of C$_{60}$ is demonstrated. The simulated
results indicated that, in the material fabricated after the quenching, the
remaining dangling bonds have a large influence on physical properties, such
as, the density and the presence of the band gap at the Fermi level. We have
furthermore studied the formation of the short-range order, observed as
amorphous diamond. In order to form the amorphous diamond phase, the bonding
state of sp$^2$ must be turned into that of sp$^3$. The transition process is
seriously influenced from the the external pressure, the temperature, or the
presence of hydrogen. The comparison to the pressure-induced structural
transition in the graphite is also executed and a brief discussion on the
difference in those carbon crystals is given.


title: Errors drive the evolution of biological signalling to costly codes

abstract:
  Reduction of costs in biological signalling seems an evolutionary advantage,
but recent experiments have shown signalling codes shifted to signals of high
cost with a underutilisation of low cost signals. Here I show that errors in
the efficient translation of biological states into signals shift codes to
higher costs, effectively performing a quality control. The statistical
structure of signal usage is predicted to be of a generalised Boltzmann form
that penalises signals that are costly and sensitive to errors. This predicted
distribution of signal usage against signal cost has two main features: an
exponential tail required for cost efficiency and an underutilisation of the
low cost signals required to protect the signalling quality from the errors.
These predictions are shown to correspond quantitatively to the experiments in
which gathering signal statistics is feasible as in visual cortex neurons.

categories: physics.bio-ph cond-mat.dis-nn physics.data-an physics.gen-ph q-bio


title: Self-trapping of strong electromagnetic beams in relativistic plasmas

abstract:
  Interaction of an intense electromagnetic (EM) beam with hot relativistic
plasma is investigated. It is shown that the thermal pressure brings about a
fundamental change in the dynamics - localized, high amplitude, EM field
structures, not accessible to a cold (but relativisic) plasma, can now be
formed under well- defined conditions. Examples of the trapping of EM beams in
self-guiding regimes to form stable 2D solitonic structures in a pure e-p
plasma are worked out.


title: Fuzzy, Non Commutative SpaceTime: A New Paradigm for a New Century

abstract:
  Much of twentieth century physics, whether it be Classical or Quantum, has
been based on the concept of spacetime as a differentiable manifold. While this
work has culminated in the standard model, it is now generally accepted that in
the light of recent experimental results, we have to go beyond the standard
model. On the other hand Quantum SuperString Theory and a recent model of
Quantized Spacetime in which, for example, an electron can be meaningfully
described by the Kerr-Newman metric, have shown promise. They lead to
mathematically identical spacetime-energy-momenta commutation relations, and
infact an identical non commutative geometry which is a departure from the
usual concept of spacetime. This could well be a new paradigm for the new
century.


title: Operator Ordering in Quantum Radiative Processes

abstract:
  In this work we reexamine quantum electrodynamics of atomic eletrons in the
Coulomb gauge in the dipole approximation and calculate the shift of atomic
energy levels in the context of Dalibard, Dupont-Roc and Cohen-Tannoudji (DDC)
formalism by considering the variation rates of physical observables. We then
analyze the physical interpretation of the ordering of operators in the dipole
approximation interaction Hamiltonian in terms of field fluctuations and
self-reaction of atomic eletrons, discussing the arbitrariness in the
statistical functions in second order bound-state perturbation theory.


title: Resonant $dd\mu$ Formation in Condensed Deuterium

abstract:
  The rate of $dd\mu$ muonic molecule resonant formation in $d\mu$ atom
collision with a condensed deuterium target is expressed in terms of a
single-particle response function. In particular, $dd\mu$ formation in solid
deuterium at low pressures is considered. Numerical calculations of the rate in
the case of fcc polycrystalline deuterium at 3 K have been performed using the
isotropic Debye model of solid. It is shown that the energy-dependent $dd\mu$
formation rates in the solid differ strongly from those obtained for D$_2$
gaseous targets, even at high $d\mu$ kinetic energies. Monte Carlo neutron
spectra from $dd$ fusion in $dd\mu$ molecules have been obtained for solid
targets with different concentrations of ortho-D$_2$ and para-D$_2$. The
neutron time spectra calculated for pure ortho-D$_2$ and para-D$_2$ targets are
very similar.


title: Why the 3D Writhe of Ideal Knots and Links Is Quantized and Additive

abstract:
  Besides mathematical interest, knots and knot theory have important
applications in physics, chemistry, and biology. Stasiak and colleagues devised
a constructive method for a knot "energy" using a Metropolis Monte Carlo
algorithm to minimize the length of rope needed to realize a given knot for a
rope of a fixed diameter. They called the resulting rendering of the knot the
"ideal" configuration. They have found (i) that the 3-dimensional (3D) writhe
of the ideal configuration of a knot appeared, empirically, to be quantized;
(ii) empirically, the 3D writhe of the ideal configuration was additive over
composition of knots; and (iii) the 3D writhe of ideal configuration of
alternating knots (which have a projection in which crossings alternate between
over and under as one transverses the knot in a fixed direction) seems to be
equal, to 1*T + 3/7*(W-B), where T is the "Tait number," and W and B are the
number of the white and black regions in the checkerboard coloring of the knot.
It is still not clear why properties i-iii might be true. Here I show that all
these empirical findings can be related to the fact that T and W-B can be
proven to be additive over composition of alternating knots. In particular, (1)
the 3D writhe of ideal configurations is likely only to be additive for
composition of alternating knots, and (2) remarkably, the geometrical structure
of all alternating (even prime) knots is determined by the three smallest
knots.


title:
Problems with "GR without SR: A gravitational-domain description of
  first-order Doppler effects" (gr-qc/9807084)

abstract:
  Einstein's goal of producing an advanced gravitational model that was
independent of special relativity's "non-gravitational" derivations has
arguably still not been achieved. The author produced a paper in 1998 outlining
a possible method of attack on the problem based on shift equivalence
principles ("Doppler mass shift"). Some problems with this paper have since
come to light. We list some further developments, some papers not cited in
gr-qc/9807084, some experimental results missed by the author, and identify a
problem with the paper's approach to aberration effects.


title: Compact vacuum phototriodes for operation in strong magnetic field

abstract:
  The results of tests of 1'' vacuum phototriodes in a magnetic field up to 4.5
T are presented. It was found that output amplitude decreases by about 6 % per
tesla in the magnetic field range from 2.0 to 4.0 T. For devices with an anode
mesh pitch of 16$\mu$m, the output amplitude at 4.0 T is 30 % lower than that
at zero field.


title:
True energy-momentum tensors are unique. Electrodynamics spin tensor is
  not zero

abstract:
  A true energy-momentum tensor is unique and does not admit an addition of a
term. The true electrodynamics' energy-momentum tensor is the Maxwell-Minkowski
tensor. It cannot be got with the Lagrange formalism. The canonical
energy-momentum and spin tensors are out of all relation to the physical
reality. The true electrodynamics' spin tensor is not equal to a zero. So,
electrodynamics' ponderomotive action comprises a force from the Maxwell stress
tensor and a torque from the spin tensor. A gauge non-invariant expression for
the spin tensor is presented and is used for a consideration of a circularly
polarized standing wave. A circularly polarized light beam carries a spin
angular momentum and an orbital angular momentum. So, we double the beams
angular momentum. The Beths experiment is considered.


title: 2s Hyperfine Structure in Hydrogen Atom and Helium-3 Ion

abstract:
  The usefulness of study of hyperfine splitting in the hydrogen atom is
limited on a level of 10 ppm by our knowledge of the proton structure. One way
to go beyond 10 ppm is to study a specific difference of the hyperfine
structure intervals 8 Delta nu_2 - Delta nu_1. Nuclear effects for are not
important this difference and it is of use to study higher-order QED
corrections.


title:
The Hierarchic Theory of Liquids and Solids. Computerized applications
  for ice, water, and Biosystems

abstract:
  This is a new book of quantum Hierarchic theory of condensed matter, general
for liquids and solids, developed by this author during 20 years and its
numerous applications. Computer program, based on new theory, was used for
simulations of big number of physical properties of water and ice. Condensed
matter is considered as a superposition of 3D standing waves (collective
excitations) of different nature: thermal de Broglie waves, IR photons and
thermal phonons. New theories of total internal energy, heat capacity, surface
tension, vapor pressure, thermal conductivity, viscosity and self-diffusion are
described. Hierarchic theory of osmotic pressure, based on new state equation,
new theories of light refraction, Brillouin light scattering and Mossbauer
effect are presented also and compared with available experimental data for
water and ice. The agreement between theoretical and available experimental
results for water and ice is very good. New approach to the turbulence,
superfluidity and superconductivity is developed. A lot of applications of new
theory to biophysics, including model of Quantum of Mind are described. New
optoacoustic device: Comprehensive Analyzer of Matter Properties (CAMP) is
proposed.


title:
Relativistic integro-differential form of the Lorentz-Dirac equation in
  3D without runaways

abstract:
  It is well known that the third-order Lorentz-Dirac equation admits runaway
solutions wherein the energy of the particle grows without limit, even when
there is no external force. These solutions can be denied simply on physical
grounds, and on the basis of careful analysis of the correspondence between
classical and quantum theory. Nonetheless, one would prefer an equation that
did not admit unphysical behavior at the outset. Such an equation - an
integro-differential version of the Lorentz-Dirac equation - is currently
available either in 1 dimension only, or in 3 dimensions only in the
non-relativistic limit.
  It is shown herein how the Lorentz-Dirac equation may be integrated without
approximation, and is thereby converted to a second-order integro-differential
equation in 3D satisfying the above requirement. I.E., as a result, no
additional constraints on the solutions are required because runaway solutions
are intrinsically absent. The derivation is placed within the historical
context established by standard works on classical electrodynamics by Rohrlich,
and by Jackson.


title:
Coherent Control of Multiphoton Transitions with Femtosecond pulse
  shaping

abstract:
  We explore the effects of ultrafast shaped pulses for two-level systems that
do not have a single photon resonance by developing a multiphoton
density-matrix approach. We take advantage of the fact that the dynamics of the
intermediate virtual states are absent within our laser pulse timescales. Under
these conditions, the multiphoton results are similar to the single photon and
that it is possible to extend the single photon coherent control ideas to
develop multiphoton coherent control.


title: Wave Universe and Spectrum of Quasars Redshifts

abstract:
  In the framework of the Wave Universe concept it is shown, that the genesis
of redshifts can be connected with the intra-system (endogenous) processes,
which take place in astronomical systems. The existance of extremal redshift
objects (quasars - QSO) with most probable z = 3.523 (3.847); 4.677; 6.947
(7.4); 10.524; 14.7; 27.79; is predicted


title:
Experimental investigations of spatial distribution anisotropy of pulsed
  plasma generator radiation

abstract:
  Results of experimental investigation of plasma luminous emittance
(integrated with respect to time and quartz transmission band spectrum) of a
pulsed plasma generator depending on its axis spatial position, are presented.
It is shown that the spatial distribution of plasma radiant intensity is of
clearly anisotropic character, that is, there exists a cone of the plasma
generator axial directions in which the radiation of plasma reaches its peak. A
possible explanation of the results obtained is given based on a hypothesis of
global anisotropy of space caused by the existence of a cosmological vectorial
potential $\bf{A}_g$. It is shown that the vector $\bf{A}_g$ has the following
coordinates in the second equatorial coordinate system: right ascension $\alpha
= 293^\circ \pm 10^\circ$, declination $\delta = 36^\circ \pm 10^\circ$. The
experimental results are in accordance with those of the earlier experiments on
determining the direction of $\bf{A}_g$.


title:
The manipulation of massive ro-vibronic superpositions using
  time-frequency-resolved coherent anti-Stokes Raman scattering (TFRCARS): from
  quantum control to quantum computing

abstract:
  Molecular ro-vibronic coherences, joint energy-time distributions of quantum
amplitudes, are selectively prepared, manipulated, and imaged in
Time-Frequency-Resolved Coherent Anti-Stokes Raman Scattering (TFRCARS)
measurements using femtosecond laser pulses. The studies are implemented in
iodine vapor, with its thermally occupied statistical ro-vibrational density
serving as initial state. The evolution of the massive ro-vibronic
superpositions, consisting of 1000 eigenstates, is followed through
two-dimensional images. The first- and second-order coherences are captured
using time-integrated frequency-resolved CARS, while the third-order coherence
is captured using time-gated frequency-resolved CARS. The Fourier filtering
provided by time integrated detection projects out single ro-vibronic
transitions, while time-gated detection allows the projection of arbitrary
ro-vibronic superpositions from the coherent third-order polarization. Beside
the control and imaging of chemistry, the controlled manipulation of massive
quantum coherences suggests the possibility of quantum computing. We argue that
the universal logic gates necessary for arbitrary quantum computing - all
single qubit operations and the two-qubit controlled-NOT (CNOT) gate - are
available in time resolved four-wave mixing in a molecule. The molecular
rotational manifold is naturally "wired" for carrying out all single qubit
operations efficiently, and in parallel. We identify vibronic coherences as one
example of a naturally available two-qubit CNOT gate, wherein the vibrational
qubit controls the switching of the targeted electronic qubit.


title: About forces, acting on radiating charge

abstract:
  It is shown, that the force acting on a radiating charge is stipulated by two
reasons - owing to exchange of a momentum between radiating charge and
electromagnetic field of radiation, and also between a charge and field
accompanying the charge.


title:
Thermodynamics of hot dense H-plasmas: Path integral Monte Carlo
  simulations and analytical approximations

abstract:
  This work is devoted to the thermodynamics of high-temperature dense hydrogen
plasmas in the pressure region between $10^{-1}$ and $10^2$ Mbar. In particular
we present for this region results of extensive calculations based on a
recently developed path integral Monte Carlo scheme (direct PIMC). This method
allows for a correct treatment of the thermodynamic properties of hot dense
Coulomb systems. Calculations were performed in a broad region of the
nonideality parameter $\Gamma \lesssim 3$ and degeneracy parameter $n_e
\Lambda^3 \lesssim 10$. We give a comparison with a few available results from
other path integral calculations (restricted PIMC) and with analytical
calculations based on Pade approximations for strongly ionized plasmas. Good
agreement between the results obtained from the three independent methods is
found.


title: Quantum fluid-dynamics from density functional theory

abstract:
  A partial differential eigenvalue equation for the density displacement
fields associated with electronic excitations is derived in the framework of
density functional theory. Our quantum fluid-dynamical approach is based on a
variational principle and the Kohn-Sham ground-state energy functional, using
only the occupied Kohn-Sham orbitals. It allows for an intuitive interpretation
of electronic excitations in terms of intrinsic local currents that obey a
continuity equation. We demonstrate the capabilities of this non-empirical
approach by calculating the photoabsorption spectra of small sodium clusters.
The quantitative agreement between theoretical and experimental spectra shows
that even for the smallest clusters, the resonances observed experimentally at
low temperatures can be interpreted in terms of density vibrations.


title: Quaternion Supergravity predicts the Standard Model

abstract:
  It is shown that extending Osp(4/1) supergravity to quaternion co-ordinates
to get HU(4/1) gives the standard model with 3 generations of fermions,
U(1)xSU(2)xSU(3) bosons plus 2 gravitinos, 1 graviton, and nothing else. It is
shown using the method of components that this is the largest supergravity
theory possible. Briefly, we look at how this relates to 16D M-Theory (which I
call Q-Theory). I hope others will be encouraged to work on this idea. This
paper was replaced because it now includes conclusions on the fermionic sector
such as the number of generations.


title:
Properties of Pt Schottky Type Contacts On High-Resistivity CdZnTe
  Detectors

abstract:
  In this paper we present studies of the I-V characteristics of CdZnTe
detectors with Pt contacts fabricated from high-resistivity single crystals
grown by the high-pressure Brigman process. We have analyzed the experimental
I-V curves using a model that approximates the CZT detector as a system
consisting of a reversed Schottky contact in series with the bulk resistance.
Least square fits to the experimental data yield 0.78-0.79 eV for the Pt-CZT
Schottky barrier height, and <20 V for the voltage required to deplete a 2 mm
thick CZT detector. We demonstrate that at high bias the thermionic current
over the Schottky barrier, the height of which is reduced due to an interfacial
layer between the contact and CZT material, controls the leakage current of the
detectors. In many cases the dark current is not determined by the resistivity
of the bulk material, but rather the properties of the contacts; namely by the
interfacial layer between the contact and CZT material.


title:
The ghostly solution of the quantum paradoxes and its experimental
  verification

abstract:
  The wave-particle duality is a mind-body one. In the real 3d-space there
exists only the particle; the wave exists in its consciousness, as well as the
reflection of the whole world. If there are many particles, their distribution
in accordance with the wave function looks as a real wave in real space.


title:
Classical calculation of high-order harmonic generation of atomic and
  molecular gases in intense laser fields

abstract:
  Based upon our previous works (Eur.Phys.J.D 6, 319(1999); Chin.Phys.Lett. 18,
236(2001)), we develop a classical approach to calculate the high-order
harmonic generation of the laser driven atoms and molecules. The Coulomb
singularities in the system have been removed by a regularization procedure.
Action-angle variables have been used to generate the initial microcanonical
distribution which satisfies the inversion symmetry of the system. The
numerical simulation show, within a proper laser intensity, a harmonic plateau
with only odd harmonics appears. At higher intensities, the spectra become
noisier because of the existence of chaos. With further increase in laser
intensity, ionization takes place, and the high-order harmonics disappear. Thus
chaos introduces noise in the spectra, and ionization suppresses the harmonic
generation, with the onset of the ionization follows the onset of chaos.


title: Rest mass or inertial mass?

abstract:
  Rest mass takes the place of inertial mass in modern physics textbooks. It
seems to be wrong. But this phenomenon is hidden away by the facts that rest
mass adherents busily call rest mass "mass", not rest mass, and the word "mass"
is associated with a measure of inertia. This topic has been considered by the
author in the article "What is mass?" [1, 2, 3]. Additional arguments to a
confirmation of such a thesis are presented here.


title:
On some Implications of (Symmetric) Special Relativity to High Energy
  Physics

abstract:
  Beside the rise of total cross sections or interaction radii of colliding
high energetic particles and the shrinkage of mean-free-paths of ultra
relativistic particles (nucleii) in material media (anomalons), which have been
shown to be of special relativistic origin [1], still other phenomena in high
energy physics may arise from relativistic kinematics. In particular this seems
to be the case with the EMC-effect and the so called atmosperic neutrino
anomaly.


title: Cauchy stress in mass distributions

abstract:
  The thermodynamic definition of pressure P = dU/dV is one form of the
principle that in a given state, the mass in V and potential are proportional.
Subject of this communication is the significance of this principle for the
understanding of Cauchy stress.


title: Analysis of Optical Pulse Propagation with ABCD Matrices

abstract:
  We review and extend the analogies between Gaussian pulse propagation and
Gaussian beam diffraction. In addition to the well-known parallels between
pulse dispersion in optical fiber and CW beam diffraction in free space, we
review temporal lenses as a way to describe nonlinearities in the propagation
equations, and then introduce further concepts that permit the description of
pulse evolution in more complicated systems. These include the temporal
equivalent of a spherical dielectric interface, which is used by way of example
to derive design parameters used in a recent dispersion-mapped soliton
transmission experiment. Our formalism offers a quick, concise and powerful
approach to analyzing a variety of linear and nonlinear pulse propagation
phenomena in optical fibers.


title: Absorption Line Shape of a One-Dimensional Bose Gas

abstract:
  We discuss the line shape for an internal state transition for bosonic atoms
confined as a one-dimensional gas. Typical line shape is an edge singularity
due to the absence of Bose-Einstein Condensation in such systems.


title: Probability tree algorithm for general diffusion processes

abstract:
  Motivated by path-integral numerical solutions of diffusion processes,
PATHINT, we present a new tree algorithm, PATHTREE, which permits extremely
fast accurate computation of probability distributions of a large class of
general nonlinear diffusion processes.


title:
Wave packet propagation study of the charge transfer interaction in the
  F^- -Cu(111) and -Ag(111) systems

abstract:
  The electron transfer between an $F^{-}$ ion and $Cu(111)$ and $Ag(111)$
surfaces is studied by the wave packet propagation method in order to determine
specifics of the charge transfer interaction between the negative ion and the
metal surface due to the projected band gap. A new modeling of the $F^{-}$ ion
is developed that allows one to take into account the six quasi-equivalent
electrons of $F^{-}$ which are {\it a priori} active in the charge transfer
process. The new model invokes methods of constrained quantum dynamics. The
six-electron problem is transformed to two one-electron problems linked via a
constraint. The projection method is used to develop a wave packet propagation
subject to the modeling constraint. The characteristics (energy and width) of
the ion $F^{-}$ ion level interacting with the two surfaces are determined and
discussed in connection with the surface projected band gap.


title: A bubble theorem

abstract:
  Proof of a simple mathematical inequality using elements of surface tension
theory and ideal gas law to the formation and coalescence of bubbles.


title: Tight open knots

abstract:
  The most tight conformations of prime knots are found with the use of the
SONO algorithm. Their curvature and torsion profiles are calculated. Symmetry
of the knots is analysed. Connections with the physics of polymers are
discussed.


title: Resonant radiation pressure on neutral particles in a waveguide

abstract:
  A theoretical analysis of electromagnetic forces on neutral particles in an
hollow waveguide is presented. We show that the effective scattering cross
section of a very small (Rayleigh) particle can be strongly modified inside a
waveguide. The coupling of the scattered dipolar field with the waveguide modes
induce a resonant enhanced backscattering state of the scatterer-guide system
close to the onset of new modes. The particle effective cross section can then
be as large as the wavelength even far from any transition resonance. As we
will show, a small particle can be strongly accelerated along the guide axis
while being highly confined in a narrow zone of the cross section of the guide.


title: Effect of Trends on Detrended Fluctuation Analysis

abstract:
  Detrended fluctuation analysis (DFA) is a scaling analysis method used to
estimate long-range power-law correlation exponents in noisy signals. Many
noisy signals in real systems display trends, so that the scaling results
obtained from the DFA method become difficult to analyze. We systematically
study the effects of three types of trends -- linear, periodic, and power-law
trends, and offer examples where these trends are likely to occur in real data.
We compare the difference between the scaling results for artificially
generated correlated noise and correlated noise with a trend, and study how
trends lead to the appearance of crossovers in the scaling behavior. We find
that crossovers result from the competition between the scaling of the noise
and the ``apparent'' scaling of the trend. We study how the characteristics of
these crossovers depend on (i) the slope of the linear trend; (ii) the
amplitude and period of the periodic trend; (iii) the amplitude and power of
the power-law trend and (iv) the length as well as the correlation properties
of the noise. Surprisingly, we find that the crossovers in the scaling of noisy
signals with trends also follow scaling laws -- i.e. long-range power-law
dependence of the position of the crossover on the parameters of the trends. We
show that the DFA result of noise with a trend can be exactly determined by the
superposition of the separate results of the DFA on the noise and on the trend,
assuming that the noise and the trend are not correlated. If this superposition
rule is not followed, this is an indication that the noise and the superimposed
trend are not independent, so that removing the trend could lead to changes in
the correlation properties of the noise.


title: Quantum Mechanical Description of Fluid Dynamics

abstract:
  In this paper, we deal with fluid motion in terms of quantum mechanics.
Mechanism accounting for the appearance of quantum behavior is discussed.


title: BGK Electron Solitary Waves Reexamined

abstract:
  This paper reexamines the physical roles of trapped and passing electrons in
electron Bernstein-Greene-Kruskal (BGK) solitary waves, also called the BGK
phase space electron holes (EH). It is shown that the charge density variation
in the vicinity of the solitary potential is a net balance of the negative
charge from trapped electrons and positive charge due to the decrease of the
passing electron density. A BGK EH consists of electron density enhancements as
well as a density depletion, instead of only the density depletion as
previously thought. The shielding of the positive core is not a thermal
screening by the ambient plasma, but achieved by trapped electrons oscillating
inside the potential energy trough. The total charge of a BGK EH is therefore
zero. Two separated EHs do not interact and the concept of negative mass is not
needed. These features are independent of the strength of the nonlinearity. BGK
EHs do not require thermal screening, and their size is thus not restricted to
be greater than the Debye length $\lambda_D$. Our analysis predicts that BGK
EHs smaller than $\lambda_D$ can exist. A width($\delta$)-amplitude($\psi$)
relation of an inequality form is obtained for BGK EHs in general. For
empty-centered EHs with potential amplitude $\gg 1$, we show that the
width-amplitude relation of the form $\delta\propto\sqrt{\psi}$ is common to
bell-shaped potentials. For $\psi\ll 1$, the width approaches zero faster than
$\sqrt{\psi}$.


title:
Kinetic theory of QED plasma in a strong electromagnetic field I. The
  covariant hyperplane formalism

abstract:
  We develop a covariant density matrix approach to kinetic theory of QED
plasmas subjected into a strong external electromagnetic field. A canonical
quantization of the system on space-like hyperplanes in Minkowski space and a
covariant generalization of the Coulomb gauge is used. The condensate mode
associated with the mean electromagnetic field is separated from the photon
degrees of freedom by a time-dependent unitary transformation of both, the
dynamical variables and the nonequilibrium statistical operator. Therefore even
in the case of strong external fields a perturbative expansion in orders of the
fine structure constant for the correlation functions as well as the
statistical operator is applicable. A general scheme for deriving kinetic
equations in the hyperplane formalism is presented.


title:
Selection for Fitness vs. Selection for Robustness in RNA Secondary
  Structure Folding

abstract:
  We investigate the competition between two quasispecies residing on two
disparate neutral networks. Under the assumption that the two neutral networks
have different topologies and fitness levels, it is the mutation rate that
determines which quasispecies will eventually be driven to extinction. For
small mutation rates, we find that the quasispecies residing on the neutral
network with the lower replication rate will disappear. For higher mutation
rates, however, the faster replicating sequences may be outcompeted by the
slower replicating ones in case the connection density on the second neutral
network is sufficiently high. Our analytical results are in excellent agreement
with flow-reactor simulations of replicating RNA sequences.

categories: physics.bio-ph cond-mat.stat-mech nlin.AO q-bio.PE


title: Quantization of Chaos for Particle Motion

abstract:
  We propose a formalism which makes the chaos to be quantized. Quantum
mechanical equation is derived for describing the chaos for a particle moving
in an electromagnetic field.


title: Duality and Cosmology

abstract:
  In some recent theories including Quantum SuperString theory we encounter
duality - it arises due to a non commutative geometry which in effect adds an
extra term to the Heiserberg Uncertainity Principle. The result is that the
micro world and the macro universe seem to be linked. We show why this is so in
the context of a recent cosmological model and a physical picture emerges in
the context of the Feynman-Wheeler formulation of interactions.


title:
Trapping oscillations, discrete particle effects and kinetic theory of
  collisionless plasma

abstract:
  Effects induced by the finite number $N$ of particles on the evolution of a
monochromatic electrostatic perturbation in a collisionless plasma are
investigated. For growth as well as damping of a single wave, discrete particle
numerical simulations show a $N$-dependent long time behavior which differs
from the numerical errors incurred by vlasovian approaches and follows from the
pulsating separatrix crossing dynamics of individual particles.

categories: physics.plasm-ph cond-mat.stat-mech nlin.CD physics.comp-ph


title:
An Invariant Formulation of Special Relativity, or the "True
  Transformation Relativity," and its Comparison with Experiments

abstract:
  Different formulations of special relativity are theoretically discussed.
First an invariant formulation, i.e., the ''true transformations (TT)
relativity,'' is exposed. There a physical quantity is represented by a true
tensor which comprises both components and a basis. Also the usual covariant
formulation and the ''apparent transformations (AT) relativity'' are
considered. It is shown that all the experiments are in agreement with the ''TT
relativity'' but not always with the ''AT relativity.''


title: An insulating grid spacer for large-area MICROMEGAS chambers

abstract:
  We present an original design for large area gaseous detectors based on the
MICROMEGAS technology. This technology incorporates an insulating grid,
sandwiched between the micro-mesh and the anode-pad plane, which provides an
uniform 200 $\mu$m amplification gap. The uniformity of the amplification gap
thickness has been verified under several experimental conditions. The gain
performances of the detector are presented and compared to the values obtained
with detectors using cylindrical micro spacers. The new design presents several
technical and financial advantages.


title:
Compositional representation of protein sequences and the number of
  Eulerian loops

abstract:
  An amino acid sequence of a protein may be decomposed into consecutive
overlapping strings of length K. How unique is the converse, i.e.,
reconstruction of amino acid sequences using the set of K-strings obtained in
the decomposition? This problem may be transformed into the problem of counting
the number of Eulerian loops in an Euler graph, though the well-known formula
must be modified. By exhaustive enumeration and by using the modified formula
we show that the reconstruction is unique at K equal or greater than 5 for an
overwhelming majority of the proteins in the PDB.seq database. The
corresponding Euler graphs provide a means to study the structure of repeated
segments in protein sequences.


title:
The Inertial Polarization Principle: The Mechanism Underlying
  Sonoluminescence?

abstract:
  In this paper we put forward a mechanism in which imploding shock waves emit
electromagnetic radiation in the spectral region $\lambda_{0}\cong 2\pi
R_{0}.$, where R$_{0}$ is the radius of the shock by the time it is first
formed. The mechanism relies on three different pieces of Physics: Maxwell's
equations, the existence of corrugation instabilities of imploding shock waves
and, last but not least, the{\em Inertial Polarization Principle}. The
principle is extensively discussed: how it emerges from very elementary physics
and finds experimental support in shock waves propagating in water. The
spectrum of the emitted light is obtained and depends upon two free parameters,
the amplitude of the instabilities and the cut-off $% R_{\max}$, the shocks'
spatial extension. The spectral intensity is determined by the former, but its
shape turns out to have only a mild dependence on the latter, in the region of
physical interest. The matching with the observed spectrum $ $requires a fine
tuning of the perturbation amplitude $\epsilon \sim 10^{-14},${\em indicating a
quantum mechanical origin. Indeed, we support this conjecture with an order of
magnitude estimative. The Inertial Polarization Principle clues the resolution
of the noble gas puzzle in SL.


title: A Good Measure for Bayesian Inference

abstract:
  The Gaussian theory of errors has been generalized to situations, where the
Gaussian distribution and, hence, the Gaussian rules of error propagation are
inadequate. The generalizations are based on Bayes' theorem and a suitable
measure. The following text sketches some chapters of a monograph that is
presently prepared. We concentrate on the material that is - to the best of our
knowledge - not yet in the statistical literature. See especially the extension
of form invariance to discrete data in section 4, the criterion on the
compatibility between a proposed distribution and sparse data in section 7 and
the ``discovery'' of probability amplitudes in section 9.


title:
Unified Theory of Bivacuum, Particles Duality, Time & Fields Bivacuum
  Mediated Interaction, as a Bridge between Normal and Paranormal

abstract:
  The coherent physical theory of Psi phenomena is absent till now due to its
high complexity and multilateral character. The original mechanism of Bivacuum
mediated Psi phenomena, proposed here, is based on few stages of my long term
efforts. They include creation of new theories: 1) Unified theory of Bivacuum,
matter and fields duality, mass and charge origination as a result of Bivacuum
fermions symmetry shift, fusion of elementary particles from sub-elementary
fermions and dynamic mechanism of their corpuscle-wave [C - W] duality; 2) New
quantitative Hierarchic theory of liquids and solids; 3) Elementary act of
consciousness or cycle of mind; 4) Theory of Virtual Replica (VR) of material
objects in Bivacuum (virtual hologram); 5) Theory of nonlocal Virtual Guides
(VirG)of spin, momentum and energy - constructed from virtual Cooper pairs of
Bivacuum fermions and antifermions, interacting side-by-side. The bundles of
VirG, connecting coherent particles of Sender (S) and Receiver (R), are
responsible for macroscopic entanglement and mediate different kinds of Psi
phenomena. The 3D net of VirG forms part of Virtual Replica of any macroscopic
object, interacting with other objects with similar properties in non
equilibrium conditions. The correctness of our Unified Theory (UT) follows from
its ability to explain a lot of unconventional experimental data, like remote
vision, mind-matter interaction, etc. without contradictions with fundamental
laws of nature.


title:
Spurious oscillations from local self-interaction correction in high
  energy photoionization calculations for metal clusters

abstract:
  We find that for simple metal clusters a single-electron description of the
ground state employing self-interaction correction (SIC) in the framework of
local-density approximation strongly contaminates the high energy
photoionization cross sections with spurious oscillations for a subshell
containing node(s). This effect is shown connected to the unphysical structure
that SIC generates in ensuing state-dependent radial potentials around a
position where the respective orbital density attains nodal zero. Non-local
Hartree-Fock that exactly eliminates the electron self-interaction is found
entirely free from this effect. It is inferred that while SIC is largely
unimportant in high photon-energies, any implementation of it within the local
frame can induce unphysical oscillations in the high energy photospectra of
metal clusters pointing to a general need for caution in choosing appropriate
theoretical tools.


title:
Effects of thermal fluctuation and the receptor-receptor interaction in
  bacterial chemotactic signalling and adaptation

abstract:
  Bacterial chemotaxis is controlled by the conformational changes of the
receptors, in response to the change of the ambient chemical concentration. In
a statistical mechanical approach, the signalling due to the conformational
changes is a thermodynamic average quantity, dependent on the temperature and
the total energy of the system, including both ligand-receptor interaction and
receptor-receptor interaction. This physical theory suggests to biology a new
understanding of cooperation in ligand binding and receptor signalling
problems. How much experimental support of this approach can be obtained from
the currently available data? What are the parameter values? What is the
practical information for experiments? Here we make comparisons between the
theory and recent experimental results. Although currently comparisons can only
be semi-quantitative or qualitative, consistency is clearly shown. The theory
also helps to sort a variety of data.


title: Designer Gene Networks: Towards Fundamental Cellular Control

abstract:
  The engineered control of cellular function through the design of synthetic
genetic networks is becoming plausible. Here we show how a naturally occurring
network can be used as a parts list for artificial network design, and how
model formulation leads to computational and analytical approaches relevant to
nonlinear dynamics and statistical physics.


title:
S-, P- and D-wave resonances in positronium-sodium and
  positronium-potassium scattering

abstract:
  Scattering of positronium (Ps) by sodium and potassium atoms has been
investigated employing a three-Ps-state coupled-channel model with Ps(1s,2s,2p)
states using a time-reversal-symmetric regularized electron-exchange model
potential fitted to reproduce accurate theoretical results for PsNa and PsK
binding energies. We find a narrow S-wave singlet resonance at 4.58 eV of width
0.002 eV in the Ps-Na system and at 4.77 eV of width 0.003 eV in the Ps-K
system. Singlet P-wave resonances in both systems are found at 5.07 eV of width
0.3 eV. Singlet D-wave structures are found at 5.3 eV in both systems. We also
report results for elastic and Ps-excitation cross sections for Ps scattering
by Na and K.


title:
Convergent variational calculation of positronium-hydrogen-atom
  scattering lengths

abstract:
  We present a convergent variational basis-set calculational scheme for
elastic scattering of positronium atom by hydrogen atom in S wave. Highly
correlated trial functions with appropriate symmetry are needed for achieving
convergence. We report convergent results for scattering lengths in atomic
units for both singlet ($=3.49\pm 0.20$) and triplet ($=2.46\pm 0.10$) states.


title:
On the Dependence of Electromagnetic Phenomena on the Relativity of
  Simultaneity

abstract:
  Maxwell's equations hold in inertial reference frames in uniform
translational motion relative to one another. In conjunction with the Lorentz
coordinate transformation equations, the transformation equations for the
electric and magnetic field components in these reference frames can be
derived. As the derivation of the Lorentz coordinate transformation equations
depends on the relativity of simultaneity, and indeed on the argument on the
relativity of simultaneity, electromagnetic phenomena indicate that human
cognition is involved in the structure and functioning of the physical world.


title: Mecanica Relacional: A proposito de uma resenha

abstract:
  We present a critical analysis of what is called Relational Mechanics, as it
has been presented in a book thus entitled, which has been recently reviewed in
this journal.


title: The ideal trefoil knot

abstract:
  The most tight conformation of the trefoil knot found by the SONO algorithm
is presented. Structure of the set of its self-contact points is analyzed.


title:
Absolute frequency measurement of the 171Yb+ clock transition with a
  Kerr-lens mode-locked femtosecond laser

abstract:
  We have measured the frequency of the $6s^2S_{1/2} - 5d^2D_{3/2}$
electric-quadrupole transition of $^{171}$Yb$^+$ with a relative uncertainty of
$1\times 10^{-14}$, $\nu_{Yb}$ = 688 358 979 309 312 Hz $\pm$ 6 Hz. A
femtosecond frequency comb generator was used to phase-coherently link the
optical frequency derived from a single trapped ion to a cesium fountain
controlled hydrogen maser. This measurement is one of the most accurate
measurements of optical frequencies ever reported, and it represents a
contribution to the development of optical clocks based on an $^{171}$Yb$^+$
ion standard.


title:
Chemical efficiency of reactive microflows with heterogeneus catalysis:
  a lattice Boltzmann study

abstract:
  We investigate the effects of geometrical micro-irregularities on the
conversion efficiency of reactive flows in narrow channels of millimetric size.
Three-dimensional simulations, based upon a Lattice-Boltzmann-Lax-Wendroff
code, indicate that periodic micro-barriers may have an appreciable effect on
the effective reaction efficiency of the device. Once extrapolated to
macroscopic scales, these effects can result in a sizeable increase of the
overall reaction efficiency.


title: Information transport by sine-Gordon solitons in microtubules

abstract:
  We study the problem of information propagation in brain microtubules. After
considering the propagation of electromagnetic waves in a fluid of permanent
electric dipoles, the problem reduces to the sine-Gordon wave equation in one
space and one time dimensions. The problem of propagation of information is
thus set.


title:
Analytic tomography of the mantle in a spherically Earth. The technique
  MZY

abstract:
  An explicit expression for P-wave velocity is proposed to develop a novel
tomographic technique in a spherically symmetric model of the Earth (MZY). The
distribution of the P velocity structure in the mantle is determined using only
34 P- and 2 PcP-observed traveltimes. By applying a non-linear inversion, the
P-residuals in the range between 0 and 100 degrees are minimised up to a
maximum value of 0.015 s. Furthermore, from the high quality computation of PcP
traveltimes, with residuals much better than 0.13 s, it is possible to infer
the existence of a brief low velocity layer in the D" region. This is then
followed by a gradual increasing in the velocity profile towards the core,
which begins at a depth of 2893.9 km.


title: On the relativistic origin of inertia and zero-point forces

abstract:
  Current approaches to the problem of inertia attempt to explain the inertial
properties of matter by expressing the inertial mass appearing in Newton's
second law of motion in terms of some other more fundamental interaction. One
increasingly popular approach explains inertial and gravitational forces as
drag forces arising due to quantum vacuum zero-point phenomena. General
relativity, however, suggests that gravitational and inertial forces are
manifestations of space-time geometry. Based on this, the present analysis
demonstrates that inertia and zero-point forces are ultimately relativistic in
origin. Additionally, it is argued that body forces induced on matter through
zero-point interactions are resistive forces acting in addition to inertia.


title: Large Faraday rotation of resonant light in a cold atomic cloud

abstract:
  We experimentally studied the Faraday rotation of resonant light in an
optically-thick cloud of laser-cooled rubidium atoms. Measurements yield a
large Verdet constant in the range of 200 000 degrees/T/mm and a maximal
polarization rotation of 150 degrees. A complete analysis of the polarization
state of the transmitted light was necessary to account for the role of the
probe laser's spectrum.


title: Anharmonic parametric excitation in optical lattices

abstract:
  We study both experimentally and theoretically the losses induced by
parametric excitation in far-off-resonance optical lattices. The atoms confined
in a 1D sinusoidal lattice present an excitation spectrum and dynamics
substantially different from those expected for a harmonic potential. We
develop a model based on the actual atomic Hamiltonian in the lattice and we
introduce semiempirically a broadening of the width of lattice energy bands
which can physically arise from inhomogeneities and fluctuations of the
lattice, and also from atomic collisions. The position and strength of the
parametric resonances and the evolution of the number of trapped atoms are
satisfactorily described by our model.


title:
Military use of depleted uranium: assessment of prolonged population
  exposure

abstract:
  This work is an exposure assessment for a population living in an area
contaminated by use of depleted uranium (DU) weapons. RESRAD 5.91 code is used
to evaluate the average effective dose delivered from 1, 10, 20 cm depths of
contaminated soil, in a residential farmer scenario. Critical pathway and group
are identified in soil inhalation or ingestion and children playing with the
soil, respectively. From available information on DU released on targeted
sites, both critical and average exposure can leave to toxicological hazards;
annual dose limit for population can be exceeded on short-term period (years)
for soil inhalation. As a consequence, in targeted sites cleaning up must be
planned on the basis of measured concentration, when available, while special
cautions have to be adopted altogether to reduce unaware exposures, taking into
account the amount of the avertable dose.


title:
Strange Attractors in Multipath propagation: Detection and
  characterisation

abstract:
  Multipath propagation of radio waves in indoor/outdoor environments shows a
highly irregular behavior as a function of time. Typical modeling of this
phenomenon assumes the received signal is a stochastic process composed of the
superposition of various altered replicas of the transmitted one, their
amplitudes and phases being drawn from specific probability densities. We set
out to explore the hypothesis of the presence of deterministic chaos in signals
propagating inside various buildings at the University of Calgary. The
correlation dimension versus embedding dimension saturates to a value between 3
and 4 for various antenna polarizations. The full Liapunov spectrum calculated
contains two positive exponents and yields through the Kaplan-Yorke conjecture
the same dimension obtained from the correlation sum. The presence of strange
attractors in multipath propagation hints to better ways to predict the
behaviour of the signal and better methods to counter the effects of
interference. The use of Neural Networks in non linear prediction will be
illustrated in an example and potential applications of same will be
highlighted.


title: Oblique Surface Waves on a Pair of Planar Periodic Slotted Waveguides

abstract:
  The dispersion relation and mode amplitudes of oblique surface waves
propagating on an acoustic double comb filter are obtained with a method based
on the calculus of residues. We obtain a better agreement (below 480 Hz)
between theoretical predictions and measurements reported previously when the
filter was being supposed to be made of a single comb structure.