4,448 research outputs found
Estimate of the possibility of conducting mass spectrometric measurements of the matter of lunar surface
Electron beams studied for use in lunar soil spectrometric analysi
The Formation of Low-Mass Double White Dwarfs through an Initial Phase of Stable Non-Conservative Mass Transfer
Although many double white dwarfs (DWDs) have been observed, the evolutionary
channel by which they are formed from low-mass/long-period
red-giant-main-sequence (RG-MS) binaries remains uncertain. The canonical
explanations involve some variant of double common-envelope (CE) evolution,
however it has been found that such a mechanism cannot produce the observed
distribution. We present a model for the initial episode of mass transfer (MT)
in RG-MS binaries, and demonstrate that their evolution into double white
dwarfs need not arise through a double-CE process, as long as the initial
primary's core mass (Md,c) does not exceed 0.46M. Instead, the first
episode of dramatic mass loss may be stable, non-conservative MT. We find a
lower bound on the fraction of transferred mass that must be lost from the
system in order to provide for MT, and demonstrate the feasibility of this
channel in producing observed low-mass (with M < 0.46M) DWD
systems.Comment: 2 pages, 1 figure, Conference Proceedings for the International
Conference on Binaries, Mykonos, Greec
Trends and perspectives in business psychology. What are the outcomes of the fifth International scientific-practical conference “Business psychology: theory and practice”?
The article analyzes the current state, trends and development prospects of business psychology based on the Fifth International Scientific and Practical Conference “Business Psychology: Theory and Practice (HSE, Moscow, Russia), which was held November, 30 — December, 1, 2018. The conference was prepared and held by the master’s program “Psychology in Business”, which is the domestic scientific and practical center for the development of business psychology — a new branch in applied psychology. Presentations, their discussion, workshops showed a growing interest of researchers and practitioners to business psychology. There has been a tendency to search for a deeper psychological validation of business psychological tools, search for integrated approaches that can be the basis for the development of business psychological practice. A more clear understanding of the structure of business psychology from the perspective of personal, organisational, social, cultural factors of business management was indicated. The strengths of business psychologists were identified in the context of their ability to solve problems systematically and rely on an interdisciplinary approach. The prospects for the development of business psychology are the following: the expansion of geography and subject areas of research and practical activities of business psychology on the development of new approaches in management and organisational consulting
Supernova Ia: a Converging Delayed Detonation Wave
A model of a carbon-oxygen (C--O) presupernova core with an initial mass 1.33
M_\odot, an initial carbon mass fraction 0.27, and with an average mass
growth-rate 5 x 10^{-7} M_\odot/yr due to accretion in a binary system was
evolved from initial central density 10^9 g/cm^3, and temperature 2.05 x 10^8 K
through convective core formation and its subsequent expansion to the carbon
runaway at the center. The only thermonuclear reaction contained in the
equations of evolution and runaway was the carbon burning reaction 12C + 12C
with an energy release corresponding to the full transition of carbon and
oxygen (with the same rate as carbon) into 56Ni. As a parameter we take
\alpha_c - a ratio of a mixing length to the size of the convective zone. In
spite of the crude assumptions, we obtained a pattern of the runaway acceptable
for the supernova theory with the strong dependence of its duration on
\alpha_c. In the variants with large enough values of \alpha_c=4.0 x 10^{-3}
and 3.0 x 10^{-3} the fuel combustion occurred from the very beginning as a
prompt detonation. In the range of 2.0 x 10^{-3} >= \alpha_c >= 3.0 x 10^{-4}
the burning started as a deflagration with excitation of stellar pulsations
with growing amplitude. Eventually, the detonation set in, which was activated
near the surface layers of the presupernova (with m about 1.33 M_\odot) and
penetrated into the star down to the deflagration front. Excitation of model
pulsations and formation of a detonation front are described in detail for the
variant with \alpha_c=1.0 x 10^{-3}.Comment: 13 pages, 11 figures, to appear in Astronomy Letter
On the estimate of the sigma^(I = 1)_(KN)(0)-term value from the energy level shift of kaonic hydrogen in the ground state
Using the experimental data on the energy level shift of kaonic hydrogen in
the ground state (the DEAR Collaboration, Phys. Rev. Lett. 94, 212302 (2005))
and the theoretical value of the energy level shift, calculated within the
phenomenological quantum field theoretic approach to the description of strong
low-energy anti-K N and anti-K NN interactions developed at Stefan Meyer
Institut fuer subatomare Physik in Vienna, we estimate the value of the
sigma^(I = 1)_(KN)(0)-term of low-energy anti-K N scattering. We get sigma^(I =
1)_(KN)(0) = (433 +/- 85) MeV. This testifies the absence of strange quarks in
the proton structure.Comment: 7 pages, no figure
Clusters as the competitive advantages of regional economies
Текущие экономические исследования регионального развития развиваются с учетом кластерного подхода, сущность которого раскрыта в данной статьеКамышанченко, Е.Н.Растопчина, Ю.Л
The priority choice in the process of strategy working-out of the social economic micro region development
The development of the social economic strategies progress of the micro region namely the choice of priority industries which progress is to be supported by the authorities.
The given article provides detailed description of a special authors’ approach how to analyze of perceptivity investment level into different sectors in frames of strategies working-out of the social economic development of the micro region.
This approach is based on the creation of a special scale within its formation special attention is paid to the identification of the life cycle stage of the industry under analyses besides the potential development possibility of industries available for resources usage.peer-reviewe
Group analysis and exact solutions of a class of variable coefficient nonlinear telegraph equations
A complete group classification of a class of variable coefficient
(1+1)-dimensional telegraph equations , is
given, by using a compatibility method and additional equivalence
transformations. A number of new interesting nonlinear invariant models which
have non-trivial invariance algebras are obtained. Furthermore, the possible
additional equivalence transformations between equations from the class under
consideration are investigated. Exact solutions of special forms of these
equations are also constructed via classical Lie method and generalized
conditional transformations. Local conservation laws with characteristics of
order 0 of the class under consideration are classified with respect to the
group of equivalence transformations.Comment: 23 page
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