Single photoeffect on helium-like ions in the non-relativistic region

We present a generalization of the pioneering results obtained for single K-shell photoionization of H-like ions by M. Stobbe [Ann. Phys. 7 (1930) 661] to the case of the helium isoelectronic sequence. The total cross section of the process is calculated, taking into account the correlation corrections to first order of the perturbation theory with respect to the electron-electron interaction. Predictions are made for the entire non-relativistic energy domain. The phenomenon of dynamical suppression of correlation effects in the ionization cross section is discussed.Comment: to be published in Physics Letters

Metal Films as Mass Standard Samples in the Nano-Gram Range

Attestation of magnetron sputtered films as mass standards is presented. Homogeneous, long-lived metal films were measured by different methods for comparison. The accuracy of the order 1 ng was found to be provided by application of the metal film standards for element analysis by X-ray fluorescent method. Keywords: Thin Films, Nano-Standards, Magnetron Sputtering, X-ray Reflectometry, X-ray Fluorescent When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/3516

Nonrelativistic double photoeffect on lithiumlike ions at high energies

The total cross section for double ionization of lithiumlike ions by a high-energy photon is calculated in leading order of the nonrelativistic perturbation theory. The partial contributions due to simultaneous and sequential emissions of two electrons are taken into account. The cross section under consideration is shown to be related to those for double photoeffect on the ground and excited 2^{1,3}S states of heliumlike ions. The double-to-single ionization ratio is equal to R = 0.288/Z^2 for lithiumlike ions with moderate nuclear charge numbers Z. However, even for the lightest three-electron targets such as Li and Be^+, analytical predictions are found to be in good agreement with the numerical calculations performed within the framework of different rather involved approaches.Comment: 12 pages, 2 figures. to be published in Physics Letters

Development of theory and devices water dynamic air conditioning

Обосновано новое решение актуальной научной проблемы создания              нормативных условий труда на робочих местах в замкнутых производственных  пространствах, в частности, в горных выработках глубоких шахт, по факторам запыленности воздуха и температуры. На основе развития теории   гидродинамического очищения воздуха от пыли и  охлаждения его водой, обоснованы функциональные, параметрические и конструктивные   особенности  кондиционера в виде многокамерного водного эжектора.  Впервые определены условия и параметры для создания импульсно-волнового процесса очищения и охлаждения воздуха в многокамерном эжекторе, позволяющем создавать смесь из воздуха и капель воды, что повышает эффективность улавливания пыли и охлаждения воздуха. Получены    закономерности,  позволяющие разработать модуль кондиционера, на  основе которого могут быть созданы  установки различной  производительности.Ключевые слова: охрана труда,  пыль, воздух, вода, очищение,  охлаждение.It is proved the new solution actual scientific problem of creating a regulatory working condition in confined spaces of production, in particular in the workings of deep mines, according to the factors of air purity and temperature. On the basis of the theory of the hydrodynamic air purification from dust and cool it with water, proved functional, parametric design features and air conditioning unit in a                  multi-chamber of the ejector. For the first time defined the conditions and parameters for creating a pulse-wave process of purification and cooling for multi-ejector-based, allowing  creating the foam from the air and water, which improves the efficiency of dust   removal and cooling. On the basis of the laws of design main unit air conditioner with multi-chamber steam ejector and refrigerant, this allows you to create blocks with the required performance.Keywords: safety, dust, air, water, purification, cooling

Theory of Doping: Monovalent Adsorbates

Contains fulltext : 224022.pdf (Publisher’s version ) (Open Access

Reactivity of free radical intermediates that form spontaneously during molecular chlorine action on acetylene and vinyl monomers at low temperatures

In this study ESR, UV, VIS and IR spectroscopy, chromatography, calorimetry, and elemental analysis were employed to show the spontaneous formation of free radicals under low-temperature action of molecular chlorine on acetylene monomer p-diethynylbenzene, and vinyl monomer acrylamide. These radicals are able to initiate chain reaction of polymerization of monomers at low temperatures. This reaction results in a completely soluble polymer with a yield of 25 %, while an insoluble cross-linked polymer has been obtained during polymerization of p-diethynylbenzene initiated by other means. For example, under radiolysis by 1000 kGy the soluble fraction of obtained polymer was ≈ 1% while the overall yield was ≈ 10%. p-Diethynylbenzene polymerizes at temperatures close to chlorine melting (170 K). Polymerization of acrylamide takes place in the temperature range of 180–210 K with an yield of polymer ≈ 10%. The low-temperature chlorination of a 20%-solution of acrylamide in glycerol enables a twofold increase of the polymer yield, and a tenfold decrease of the chlorine content in it

Возрастные зависимости длин теломер клеток мышечной ткани хищных видов рыб с потенциально различным механизмом старения

The mechanisms of aging differ and have their own features both mammals, and in different species groups of fish. Telomere length is an indicator of the theoretical number of cell cycles that cells of a particular tissue can go through; therefore, the age-related dynamics of telomere length characterizes changes in the tissue's ability to regenerate and is necessary to describe the mechanism of tissue aging. In this work, age-related linear regressions of the telomere lengths of muscle tissue of northern pike (Esox lucius) and zander (Sander lucioperca) were empirically obtained for the wide age groups of individuals of both sexes. The identified significant difference in the dependences on their slope values indicates different degrees of decrease in the ability to regenerate muscle tissue with age, which is consistent with the previously discovered physiological characteristics of the muscle tissue of pike. In both fish species studied, telomere length in females decreases with age much more slowly than in males, which is a common feature in the aging mechanisms of most vertebrates.Механизмы старения отличаются и имеют свои особенности как у рыб и млекопитающих, так и у различных видовых групп рыб, поэтому представляют научный интерес. Длина теломер является показателем теоретического числа клеточных циклов, которые могут пройти клетки той или иной ткани, следовательно, возрастная динамика длины теломер характеризует изменение способности ткани к регенерации и необходима для описания механизма старения. В данной работе эмпирически получены линейные зависимости длин теломер мышечной ткани щуки (Esox lucius) и судака (Sander lucioperca) от возраста рыбы для широких возрастных выборок особей обоих полов. Достоверно выявленная разница зависимостей длины теломер от возраста по угловым коэффициентам свидетельствует о разной степени снижения способности к регенерации мышечной ткани со временем, что согласуется с обнаруженными ранее физиологическими особенностями этой ткани у щуки. У обоих исследуемых видов рыб длина теломер у самок уменьшается с возрастом значительно медленнее, чем у самцов, что является общей чертой в механизмах старения большинства позвоночных

Nonforward anomalous dimensions of Wilson operators in N=4 super-Yang-Mills theory

We present the next-to-leading order results for universal non-forward anomalous dimensions of Wilson twist-2 operators in N=4 supersymmetric Yang-Mills theory. The whole calculation was performed using supersymmetric Ward identities derived in this paper together with already known QCD results and does not involve any additional calculation of diagrams. We also considered one particular limit of our result, which could potentially be interesting in the context of AdS/CFT correspondence.Comment: 15 pages, references added, typos corrected, version accepted in JHE

Observation of KS0K_S^0 semileptonic decays with CMD-2 detector

The decay $K_S^0 \to \pi e \nu$ has been observed by the CMD-2 detector at the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced $K_L^0K_S^0$ pairs, $75 \pm 13$ events of the $K_S^0 \to \pi e \nu$ decay were selected. The corresponding branching ratio is $B(K_S^0 \to \pi e \nu)=(7.2 \pm 1.4)\times10^{-4}$. This result is consistent with the evaluation of $B(K_S^0 \to \pi e \nu)$ from the $K_L^0$ semileptonic rate and $K_S^0$ lifetime assuming $\Delta S=\Delta Q$ .Comment: 7 pages, 6 figures, LaTex2e. Submitted to Phys.Lett.

Study of the process e+e- to pi+pi-pi+pi-pi0 with CMD-2 detector

The process e+e- to pi+ pi- pi+ pi- pi0 has been studied in the center of mass energy range 1280 -- 1380 MeV using 3.0 1/pb of data collected with the CMD-2 detector in Novosibirsk. Analysis shows that the cross section of the five pion production is dominated by the contributions of the eta pi+pi- and omega pi+pi- intermediate states.Comment: 8 pages, 3 figure. Submitted to Phys. Lett.