Archive on 1997 Year
November,
18 1997
Ashot
Gevorkian
Tunnel
Dynamics in Three Body Collinear System in the Framework of the Complex
Internal Time Approach
November,
11 1997
N.V.Serov
On
modeling of the natural intelligence.
November,
3 1997, Monday.
11-00 a.m.
J.-P. Connerade
Imperial College, London
From atoms to solids through clusters.
November,
4 1997
G.E.Skvortsov
St.Petersburg State University
Dep. of Mathematics and Mechanics
System
for fundamental natural sciences.
October,
28 1997
V.G.Dubrovskii
Spontaneous
transformation of adsorbed layer into the self-assembled arrays of nanoobjects.
October,
21 1997
A.
Boukhanovsky Information on VI International Conference on Stability of
Ships and Ocean Vehicles.
A.V.Bogdanov,
Yu.E.Gorbachev Some preliminary results
on the visit to Netherland and German research centres.
October,
7 1997
Ashot.S.Gevorkyan
Information on 8-th Regional Conference
on Mathematical Physics (Nor Amberd, Armenia, June26-July4 1997) and
Information on 4-th International Conference "Problems of Modern
Mathematical Physics" (Nor Amberd, Armenia, September 5-12 1997)
Yu.M. Tsirkunov
(Baltic State Technical University) 3-rd
EUROMECH Conference on Mechanics of Fluids (Brief information)
September,
30 1997
Sokolov
E.I. Information on 3-th International Conference
"Numerical modelling in continuum Mechanics" (Prague, 8-11
september 1997)
Samsonov
A.M. 3d European Solid Mechanics Conference,
Stockholm, August 18-23, 1997.
August,
12 1997
Vladimir
N. Strocov
Electronic
Structure of Solids: Main Computational Approaches and Experimental Methods
(Overview)
The
electronic structure of crystalline solids is a key concept, which determines
the amazing variety of their properties. I overview the basic approaches
to compute the electronic structure, emphasizing the underlying approximations
(Local-Density Approximation, ets.). The principal difference of an excited-state,
and the ground-state electronic structure is stressed. I also describe
the main experimental methods: Photoelectron Spectroscopy for occupied
electron states, and Inverse Photoelectron Spectroscopy and Very-Low-Energy
Electron Diffraction for unoccupied states.
May,
13 1997
Pavel P.
Yakutceny, Sergey A. Suvorov St. Petersburg,
Institute of Toxicology, Ministry of Health Russia
Computer
Aided Drug Design and Fullerenes
Abstract
Computer Aided Drug Design (CADD) is the part of pharmacology. Its aim
is to determine and interpret the relationship between chemical structure
and biological activity. It is evident that this relationship should be
very close but as usually unknown. In these reason CADD uses a wide set
of data for biological or pharmacological activity of chemicals for empirical
searching of quantitative structure-activity relationships (QSAR). Strategy
used in such instances named as "indirect". It's based on delineating
regressions, artificial intelligence and some other methods. Fullerenes
have not any prototypes between known biologically active compounds. It
is a typical example when due to the lack of experimental data indirect
design is not available. Another way for prediction of biologically activity
is "direct" molecular modelling. Owing to the lack of present
knowledge attempts to propose such models of action for most drugs are
often disappointing. Discussed new innovative method for the molecular
modelling of interactions of chemicals with the biological membranes. This
method is based on the non-empirical computer's simulations (Monte Carlo
simulation techniques and Molecular Mechanics) of behavioral of chemicals
in lipids bilayers. On examples of fullerenes and related compounds postulated
that application of this method with other allow the real chances for the
next step in effective prediction of transport, penetration, disposition,
metabolic conversion, main and side activity of chemicals. Demonstrated
that further fundamental investigations of fullerenes may improve our understanding
of general mechanism(s) of biological action and lead to determination
of perspective of application of fullerenes as carriers for another active
compounds or independently acting pharmacological agents with neurotropic
or other activities.
April 22 1997
V.N.Svetlov
(The Ioffe Institute of the Russsian Academy of Sciences)
On
formation and evolution of the Solar system
Abstract
Based on assumption that the collapse of a protocloud could be accompanied
with waves of diffrent nature, the hypothesis is put forward , according
to which cosmic bodies in Solar system are products of parametic wave resonance
interaction. A model is proposed that provides to connect wave parameters
with the observable parameters of planets and satellites. Consequencies
are detected that allow to explain some anomalies existing in the solar
system structure.
April 8 1997
Alexander
Kazansky
Institute for Evolutionary Phyiology and Biochemistry, Russian Academy
of Sciences,
Stochastic
Simulation of biological population dynamics with evolving life - history
parameters: an adaptive response of fish populations to transformation
of their environments.
Abstract
The individual-based Monte-Carlo discrete-time energetical model of iteroparous
biological population dynamics with evolving life-history traits was used
for the prediction of environmentally induced adaptive modification of
phenotypic composition in fish populations. The population in the model
is described by an ensemble of sexually equal self - reproducing individuals.
The parameters, describing life-history traits, such as fecundity, size
at first maturation, maximum rate of somatic growth, longevity, size of
eggs are specific for every individual and can be inheritable. The ranges
of this parameters variation characterize the specific phenotypic plasticity
and individual diversity. These ranges, as well as correlations between
parameters, ('trade-offs') characterize the life-history strategy of different
species, their response to the transformation of the environment. Environment
in the model is described by the parameters of available feeds provision
and of the additional exogeneous mortalities at different sizes caused
by fishery, deseases or toxications. The process of simulation in the eternal
situation of parametric uncertainty is accompanied by a decision - making
process and the searching for 'trades-offs'. So, this simulation is of
a research type. In a 60-100 instrumental time-steps which corresponds
to 60-100 yearshe process brings to selection of evolutionary - stable
peak-type distribution of individual life-history parameters in population
in every realization. In the case of moderate level of mutations, the different
realizations of the process gives close results. Extra high frequency of
mutations results in wide distribution by realizations, but some regularity
in adaptive response of population on change of environmemt could be traced
on the level of statistical characteristics, such as mode. The applying
of the model to the simulation of the wild populations, living in different
reservoirs gave plausible results. The model predicted frequently observed
in nature lowering of size at first maturation , poor growth and shorter
life-span of fish poulation in contaminated areas, in random environment
and under high rate of mortality of adults. The strategy of population
in the situation of applying of selective fishing or in conditions of fluctuating
recruitment is analysed as well. The process of experimental natural mortalities
in age classes reconstruction (reversed problem) was realised as well .
. It appeared to be much more effective and robust than traditional procedures
admitted in fishery science, such as so called 'virtual population analysis'.
Some prospects of using of supercomputers for realization of evolutionary
and genetical algorithms as well as their role in Artificial Life will
be discussed.
April
1 1997
M.L.
Shmatov A.F. Ioffe Phisical Technical Institute, 194021 St. Petersburg,
Russia
Ignition
of a thermonuclear microexplosion with cluster ion beams
Some
methicls of ignition of thermonuclear micrexplosions with cluster ion beams
are imsidered. It is shown that clusters, used for the indirect ignition,
can be strongly ionized and, thereby, lestvoged by thermal radiation. Target
designs, sappressing such photoionization, are proposed.
March
25 1997
A.N.Labusov
Laboratory 1-4 headed by E.I.Sokolov
Technology
strategy for technical computing.
March
18 1997
V.A.Yerokhin
Self-energy
second order corrections for highly charged ions.
Abstract
The full QED investigation of diagrams of screened self-energy for the
ground state of two-electron highly charged atoms was made. The self-energy
contribution to the hyperfine splitting of the ground state of one-electron
atoms was calculated as well. An uncertainty of theoretical values of the
ground state of highly charged ions was significanly decreased due to this
calculation.
March
11 1997
A.V.Spirov
Non-linear
kinetics of activation of genes networks.
T.Gavrilova
Information about visit to Tokyo Denki University.
March
6 1997
13.30 p.m. John Reinitz (Brooksdale Center for Molecular
Biology, Maunt Sinai Medical School, New York, USA)
Dynamics
of Segment Determination in Drosophila: a Computational Analysis
Abstract
Both theoretical and experimental studies were done on mechanisms of segmentation
genes expression during early Drosophila embryogenesis. Theses studies
are aimed on a better understanding of the process by which maternal gene
product gradients ultimately give rise to the segmental pattern by means
of regulatory cascade of transcription factors encoded by zygotic segmentation
genes.
The
qualitative characteristics of segmentation genes expression patterns obtained
by means of confocal microscopy are used as a state variables in the dynamic
model for genes expression pattern formation. To fit the model to observed
levels of segmentation genes products the parameters are adjusted by least-squares
optimization. This optimization is carried out by the method of simmulated
annealing.
The
validity and utility of the model has been demonstrated by its successful
application to several important problems of embryo development.
March
4 1997
A.S.
Gevorkyan, A.G.Pogosyan
Transparency
effect for nonrelativstic electrons(positrons) in solid state appeared
under ultrasonic action.
February
25 1997
A.H.Zilbershtein,
V.C.Semenov
Problem
of the flun non-homogency formation (rithmic and inclusive) for magmatic
geological bodies.
February
18 1997
M.G.Samsonova
The
application of GeNet database for modelling of early morphogenesis.
February
11 1997
Ashot
Gevorkyan.
Dynamics
of quantum reactive harmonic oscillator interacting with vacuum. Properties
of vacuum.
February
4 1997
Alexander
M.Samsonov.
On
exact solutions to nonlinear reaction-diffusion equation.
January
28 1997
Eugeny
E. Kolesnichenko.
Structure
of natural phylosophy from the point of view of the development of computer
information systems. Problems and prospects.
January
21 1997
Labusov
A.N. Laboratory, headed by Sokolov E.I.
Review
of the grid construction methods for gasdynamic problems.
January
14 1997
Ignatiev
A.A. Laboratory, headed by Sokolov E.I.
Experience
in application of the difference schemes of high resolution capability
for computing viscose internal and jet flows.
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