89 research outputs found
Variations of cosmic rays according to the data of interplanetary probes Zond-3 and Venus-2
Cosmic ray intensity variation measured by Zond 3 and Venus 2 interplanetary probe
Distribution of Tryptophan-Dependent <I>Yersinia pestis</I> Variants in the Altai Mountain Natural Plague Focus
Carried out is the analysis of spatial location of tryptophan-dependent variants of plague microbe in the territory of Altai mountain plague natural focus. 1166
Y. pestis strains isolated in 1990–2010, were studied as regards nutrient requirements. 140 of them (12 %) were determined as tryptophan-dependent. The highest occurence of such strains was registered in Ulandryk focal region (21.6 % in average). Among strains isolated in Tarkhatin focal region only 2.3 % were tryptophan-dependent, and in Kuray region they were absent. Thus, the data obtained suggest that spatial heterogeneity of
Y. pestis
subsp.
altaica in the focus takes place
Influence of the space charge of an ion beam on the time-of-flight diagnostics of its composition
Environmental and Technological Aspects of Converter Slag Utilization in Sintering and Blast-Furnace Production
Political and Cultural Transfers in a Time of Revolution. The Netherlands 1795-1805One of the hallmarks of modern historiography is its strong engagement with the national scene. Yet despite this, European countries have always exchanged ideas and practices and influenced each other. This was the case, for example, between 1795 and 1805, during which period the Dutch had to rethink their society and their government. To do this, they entered into a deep and creative dialogue with France in particular, as well as America. The manner in which this took place and its consequences are explored in this paper
30 MeV injector for a synchrotron
An electron source for a synchrotron is described. The source consists of RF gun, bunch forming system, and linear accelerator operating at 2856 MHz. Packets of electron bunches are formed within the RF gun with time intervals, which correspond to the accelerating RF voltage period of the synchrotron, that decreases the radiation background during injection
Measurement of the branching fraction of at KEDR
We present the study of the decay . The results
are based on of 5.2 million events collected by the KEDR detector at
VEPP-4M collider. The branching fraction is measured to be
where the first uncertainty is statistical, the second one
is systematic. This is the most precise single measurement of this quantity at
the moment
Investigations of Structural-Functional Aspects of Epizootic Process in Natural Plague Foci in Siberia
Comprehensively studied have been structural elements of ecosystems of Siberian natural plague foci, as well as levels of integration among epizootic process components, and ways of their functional interaction. Application of the complex approach to the surveillance over structural-functional elements of the parasitic system along with investigations of epizootic process dynamics has provided for identification of peculiarities as regards epizootics development, transformation and evolution of population and carrier/vector coenosis structure in time and space. Revealed is the genetic diversity of plague microbe circulating within the bounds of separate foci and zones of focality. Determined is a long-lasting anti-epidemic effect (more than 20 years) of the field desinsection in the Saglinsk meso-focus of the Tuva natural plague focus
Ab Initio Study of the Structural Phase Transition in Cubic Pb_3GeTe_4
In the substitutionally disordered narrow-gap semiconductor Pb_{1-x}Ge_xTe, a
finite-temperature cubic-rhombohedral transition appears above a critical
concentration . As a first step towards a first-principles
investigation of this transition in the disordered system, a (hypothetical)
ordered cubic Pb_3GeTe_4 supercell is studied. First principles
density-functional calculations of total energies and linear response functions
are performed using the conjugate-gradients method with ab initio
pseudopotentials and a plane-wave basis set. Unstable modes in Pb_3GeTe_4 are
found, dominated by off-centering of the Ge ions coupled with displacements of
their neighboring Te ions. A model Hamiltonian for this system is constructed
using the lattice Wannier function formalism. The parameters for this
Hamiltonian are determined from first principles. The equilibrium
thermodynamics of the model system is studied via Metropolis Monte Carlo
simulations. The calculated transition temperature, T_c, is approximately 620K
for the cubic Pb_3GeTe_4 model, compared to the experimental value of T_c
\approx 350K for disordered Pb_{0.75}Ge_{0.25}Te. Generalization of this
analysis to the disordered Pb_{1-x}Ge_xTe system is discussed.Comment: 38 pages, LaTeX, 11 PostScript figure
Recommended from our members
Energetic particle influence on the Earth's atmosphere
This manuscript gives an up-to-date and comprehensive overview of the effects of energetic particle precipitation (EPP) onto the whole atmosphere, from the lower thermosphere/mesosphere through the stratosphere and troposphere, to the surface. The paper summarizes the different sources and energies of particles, principally
galactic cosmic rays (GCRs), solar energetic particles (SEPs) and energetic electron precipitation (EEP). All the proposed mechanisms by which EPP can affect the atmosphere
are discussed, including chemical changes in the upper atmosphere and lower thermosphere, chemistry-dynamics feedbacks, the global electric circuit and cloud formation. The role of energetic particles in Earth’s atmosphere is a multi-disciplinary problem that requires expertise from a range of scientific backgrounds. To assist with this synergy, summary tables are provided, which are intended to evaluate the level of current knowledge of the effects of energetic particles on processes in the entire atmosphere
- …