267 research outputs found
В поисках механизмов социальных изменений в современной Украине
No full textBook Review: Savelyev Y. Multidimensional modernity: social inclusion in assessment of social development: monograph / Yuriy Savelyev. – K. : VPC "The University of Kyiv", 2017. – 447 p. [in Ukrainian]Рецензия на книгу: Савельєв Ю. Б. Багатовимірна сучасність: соціальне включення в оцінці суспільного розвитку : монографія / Ю. Б. Савельєв. – К. : ВПЦ "Київський університет", 2017. – 447 с
Probing the Gate-Voltage-Dependent Surface Potential of Individual InAs Nanowires Using Random Telegraph Signals RID C-6303-2008
No full textWe report a novel methocl for probing the gate-voltage dependence of the surface potential of individual semiconductor nanowires. The statistics of electronic occupation of a single defect on the surface of the nanowire, determined from a random telegraph signal, is used as a. measure for the local potential. The method, is demonstrated for the case of one or two switching defects in indium arsenide (InAs) nanowire field effect transistors at temperatures T = 25-77 K. Comparison with a self consistent model shows that surface potential variation is retarded In the conducting regime due to screening by surface states with density D(ss) approximate to 10(12) cm(-2) ev(-1). Temperature-dependent dynamics of, electron capture and emission producing the random telegraph signals are also analyzed, and multiphonon emission is identified as the process responsible for capture and emission of electrons from the surface traps. Two defects studied in detail had capture activation energies of E(B) approximate to 50 meV and E(B) approximate to 110 meV and cross sections of sigma(infinity) approximate to 3 x 10(-19) cm(2) and sigma(infinity) approximate to 2 x 10(-17) cm(2), respectively. A lattice relaxation energy of s (h) over bar omega = 187 +/- 15 meV was found for the first defect
Erratum to: Nonuniversal Scaling Behavior of Conductivity Peak Widths in the Quantum Hall Effect in InGaAs/InAlAs Structures (Semiconductors, (2018), 52, 12, (1551-1558), 10.1134/S1063782618120102)
No full textThe name of the third author should read E. V. Ilchenko. © 2018, Pleiades Publishing, Ltd
C–C and C–N bond formation in electro-oxidation reactions of aromatic compounds
No full textAtom-economical, eco-efficient, metal- and chemical oxidant-free formation of C–C and C–N bond from C(sp2)−H and C(sp3)−H of arenes toward the direct synthesis of biaryls and anilides or N-benzylamides under mild electro-oxidative conditions is described. The products of C–C and C–N coupling are obtained in up to 88% yields. Aromatic substrates that are oxidized at potentials less positive than +2 V or have bulky bromine or iodine substituents undergo homo-coupling reactions by anodic oxidation to form biaryls or dimers. Aromatic substrates that are difficult to oxidize (Eox > +2 V) preferentially form anilides and N-benzylamides upon anodic oxidation. The presence of a chlorine substituent on the aromatic ring leads to the formation of both biaryls and anilides during electro-oxidation
TO THE NEED OF INCREASING THE LEVEL OF PROFESSIONAL TRAINING OF EXPERTS IN THE CONTEXT OF DIFFERENTIATION AND INTEGRATION OF SCIENTIFIC KNOWLEDGES
No full textDevelopment of 3D Microstructures for the Formation of a Set of Optical Traps on the Optical Axis
No full textThree-dimensional (3D) microstructures used in the formation of optical traps on the optical axis in the near diffraction zone are calculated and studied. Subwavelength, variable-height annular gratings (a lattice period of 1.05λ) with a standard and graded-index (GRIN) substrate are considered as microstructures. Two scenarios are examined for changing the refractive index n of the GRIN substrate: from a maximum n in the center to a minimum n at the edges (direct GRIN) and, conversely, from a minimum n in the center to a maximum n at the edges (reverse GRIN). The propagation of light through the proposed 3D microstructures is simulated using the finite-difference time-domain (FDTD) method. The possibility of obtaining not only single but also a set of optical traps on the optical axis is demonstrated. It is also shown that compared to the results obtained with a diffractive axicon, the size of the focal spot can be reduced by 21.6% when use is made of the proposed 3D microstructures and the light needle is increased by 2.86 times
Realization of a Radiometric Channel as Part of the Microwave Sensing Complex in the Presence of Permanent Intrasystem Narrowband Interference
No full textMAGNESIUM METABOLISM AND CLINICAL CHARACTERISTICS OF PATIENTS WITH CHRONIC ISCHEMIC HEART DISEASE
No full textAim. To study relationship of the clinical state and cardiac functional parameters with magnesium metabolism indices in patients with chronic ischemic heart disease (IHD).Material and methods. Patients with stable angina pectoris, II-III class (n=480) were involved into the study. Evaluation of the following items was performed: disease course, anxiodepressive syndrome intensity, exercise tolerance, blood and urine electrolyte profile, systolic and diastolic left ventricle function, endothelium-dependent and endotheliumnondependent vasodilatation, i/v magnesium load test, Holter electrocardiogram monitoring.Results. High prevalence of systemic magnesium deficiency (17.9 and 37.5% according to serum and erythrocyte levels, respectively) was found in IHD patients. Severity of magnesium deficiency in IHD patients depended on duration of disease, experience of myocardial infarction, myocardial ischemia seriousness, disorders of endothelium vasodilating function and left ventricle diastolic function, severity of concomitant anxiety. Exercise tests were changed in IHD patients with magnesium deficiency.Conclusion. The study data let to consider that magnesium deficiency involves into the IHD pathogenesis
THE PNEUMATIC TRAINING APPARATUSES WITH ADJUSTABLE ELASTICITY
No full textIntroduction
Powerful impact loads are present in many sports. Their
frequent repetition in athletic training causes overloading and injuries
to the motor support apparatus of many athletes. As a result, training
loads must be decreased, which disrupts training plans and creates a
number of complications. This refers particularly to jumping events. In
gymnastics, for example, over 50% of all injuries are related to jumping
exercises and the gymnast\u27s landings
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