461 research outputs found
Spectral multiplicity for powers of weakly mixing automorphisms
We study the behavior of maximal multiplicities for the powers of
a weakly mixing automorphism . For some special infinite set we show the
existence of a weakly mixing rank-one automorphism such that
and for all . Moreover, the cardinality
of the set of spectral multiplicities for is not bounded. We have
and , , . We
also construct another weakly mixing automorphism with the following
properties: for but ,
all powers have homogeneous spectrum, and the set of limit points of
the sequence is infinite
Study of the dependence of Young's modulus of vertically aligned carbon nanotubes on their aspect ratio
The reported study was funded by RFBR according to the research projects No.16-29-14023 ofi_m, No.18-32-00652 and by grant of the Southern Federal University (project No. VnGr-07/2017-26)
Vector Meson Production in Ultraperipheral Heavy Ion Collisions
The ultraperipheral heavy ion collisions (UPC's) are an important alternative
to study the QCD dynamics until the next generation of
colliders become reality. Due to the coherent action of all the protons in the
nucleus, the electromagnetic field is very strong and the resulting flux of
equivalent photons is large, which allows to study two-photon as well as
photonuclear interactions at high energies. In this paper we present a brief
review of the vector meson production in UPC's at high energies using the QCD
color dipole approach to describe their photonuclear production and the
perturbative QCD Pomeron (BFKL dynamics) to describe the double meson
production in photon-photon process. Predictions for rates and integrated cross
sections are presented for energies of RHIC and LHC.Comment: 16 pages, 1 figure. Version to be published in Journal of Physics G:
Nuclear and Particle Physic
Vertically Aligned Carbon Nanotubes Production by PECVD
This chapter presents the results of experimental studies of the PECVD technological mode parameters’ influence on the formation of catalytic centers and carbon nanotubes’ (CNTs’) growth processes. This chapter also presents the ability to regulate the growth parameter for the controlled production of CNTs with the required geometric parameters, properties, and growth mechanisms. The results of experimental studies of the heating temperature and activation time effects on the catalytic center formation will be presented. This chapter also shows the effects of growth temperature, heating rate, and the activation time on the geometric and structural parameters of the carbon nanotubes. Experimental studies were carried out with the use of AFM, SEM, TEM, and EXAFS techniques. The results can be used in the development of technological processes for creating ultrafast energy-efficient electronic component base with carbon nanostructures, particularly nanoelectromechanical switches, flexo- and piezoelectric generators, gas sensors, and high-performance emitters
The Assessment of Light Environment with the First Generation Leds
The article describes experimental studies on the effectiveness of lighting installations (LI) with light-emitting diodes (LEDs). It is established that LED-based lighting does not cause a negative impact on the organ of vision and the human body as a whole. The changes in the functional parameters of the organ of sight, which occur during the visual performance has the corresponding limits of physiological fluctuations and are reversible. The integral indicators of the efficiency of LED-based lighting were estimated. The practical significance of the results was shown
Dynamics of СО2 evolution bу plants at low pressure
Dynamics of СО2 evolut:ion at low pressure was studied in barley, maize, реа, wheat and pine seedlings using the gas exchange system with laser photoacoust:ic spectrometer. The СО2 evolut:ion from plant surfaces to environment increased with decreasing air pressure. Simultaneously the changes in act:ivities of phosphoenolpyruvat
Influence of the focused ion beam parameters on the etching of planar nanosized multigraphene/SiC field emitters
The equipment of the Collective Usage Center “Nanotechnologies” and the Research and Educational Center "Nanotechnologies" of Southern Federal University was used for this study. This work was funded by Internal grant of Southern Federal University No. VnGr-07/2017-26
MULTIVALUED SYMPTOMS PSYCHOTHERAPY
This article describes how the rapid development of modern psychotherapy led to a wide variety of areas, and schools, making it difficult to even its single definition. In domestic psychotherapy are two different areas: clinical and psychological therapy, which differ on the project (patients and clients) and their means, which makes their differences with respect to the diagnosis. In psychological therapy services primarily mentally healthy individuals (clients) with personal and situational problems, which are reflected in the symbolic form of symptoms, psychiatric diagnosis and, therefore, is of secondary importance. While clinical psychotherapy busy treating people with mental disorders, for which the identification of symptoms and psychiatric diagnosis is essential. The expediency of psychiatric diagnosis prior to psychological therapy. The expediency of adequate combined use of psychopharmacological and psychological tools in clinical psychotherapy. The analysis of the differences between the concepts of the phenomenon and psychopathological symptoms. Describes the idea of the systemic nature of psychopathological symptoms and justifying the importance of symptomatic therapy
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