Optically Controlled Excitonic Transistor

Optical control of exciton fluxes is realized for indirect excitons in a crossed-ramp excitonic device. The device demonstrates experimental proof of principle for all-optical excitonic transistors with a high ratio between the excitonic signal at the optical drain and the excitonic signal due to the optical gate. The device also demonstrates experimental proof of principle for all-optical excitonic routers

Oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel

Liquid-phase oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel was studied by a kinetic method. Associative interactions between the substrate, oxidant, and gel were detected by voltammetry and ESR and IR spectroscopy.Russian Foundation for Basic Researc

Excitation Energy Dependence of the Exciton Inner Ring

We report on the excitation energy dependence of the inner ring in the exciton emission pattern. The contrast of the inner ring is found to decrease with lowering excitation energy. Excitation by light tuned to the direct exciton resonance is found to effectively suppress excitation-induced heating of indirect excitons and facilitate the realization of a cold and dense exciton gas. The excitation energy dependence of the inner ring is explained in terms of exciton transport and cooling.Comment: 5 pages, 4 figure

Transport of Indirect Excitons in a Potential Energy Gradient

We realized a potential energy gradient - a ramp - for indirect excitons using a shaped electrode at constant voltage. We studied transport of indirect excitons along the ramp and observed that the exciton transport distance increases with increasing density and temperature.Comment: 4 pages, 3 figure

Developing Effective Roll Cooling Systems Based on Computational Simulation

In order to retrofit a roll cooling system at the JSC ‘Katur Invest’ rolling mill, computational simulation was carried out for a process of accelerated emulsion spray cooling the rolls heated during rolling. Initial and boundary conditions for the Fourier equation in the case of a body of infinite length and arbitrary cross-sectional shape were determined for the thermal state conditions of rolls in mill stands No. 1, 2, 5, 7. After model adaptation, a comparative analysis of the roll temperature field dynamics in different cooling conditions was made based on experimental data. The analysis revealed that extending the time of emulsion cooling, evenwithout any further cooling process intensification, allows to significantly reduce both the maximum temperature level in a roll and its penetration depth, which results in required roll surface temperature reduction. Based on computational simulation, cooling parameters and conditions for the retrofitted cooling system are selected. Experimental data on roll surface temperature as measured before and after retrofitting the cooling system proved its effectiveness. Keywords: rolling, rolls, accelerated cooling, temperature field, simulatio

Optical studies of the X-ray transient XTE J2123-058 -I. Photometry

We present optical photometry of the X-ray transient XTE J2123-058, obtained in July-October 1998. The light curves are strongly modulated on the 5.95hrs orbital period, and exhibit dramatic changes in amplitude and form during the decline. We used synthetic models which include the effect of partial eclipses and X-ray heating effects, to estimate the system parameters, and we constrain the binary inclination to be i=73+-4 degrees. The model is successful in reproducing the light curves at different stages of the decay by requiring the accretion disc to become smaller and thinner by 30% as the system fades by 1.7 mags in the optical. From Aug 26 the system reaches quiescence with a mean magnitude of R=21.7+-0.1 and our data are consistent with the optical variability being dominated by the companion's ellipsoidal modulation.Comment: 6 pages, 6 figure

Особливості типів конструкцій cучасних меблів трансформерів

Features furniture-transformer structures depend on the product and the idea of functionality. Development furnituretransformers with multiple functions and transformations appearance was due to a limited area of housing. It was found the main types of modern furniture design solutions transformers, frame, safety frame, mounted skeleton.Особенности конструкций мебели-трансформеров зависят от идеи изделия и от функционального назначения. Развитие мебели- трансформеров с несколькими функциями и трансформациями было обусловлено появлением ограниченного по площади жилья. Было выявлены основные типы конструктивных решений современной мебелитрансформеров: каркасные, непосредственно каркасные, встроенные каркасные.Особливості конструкцій меблів-трансформерів залежать від ідеї виробу та від функціонального призначення. Розвиток трансформерів з декількома функціями та трансформаціями було обумовлено появою обмеженого за площею житла. Було виявлено основні типи конструктивних рішень сучасних меблів-трансформерів: каркасні, безкаркасні, вмонтовані каркасні

SOME THROMBOCYTE FACTORS DEVELOPMENT OF THROMBOCYTOPENIA IN PATIENTS WITH CHRONIC HEPATITIS C

Purpose: to examine the frequency of mutations W 515K and W 515L in the Mpl, the encoder receptors platelets to thrombopoietin and determine the degree of activity of enzymes of blood platelets - glycogen, alpha-naphthylhesterase(αANАE) and adenosine triphosphatase (ATPase). at patients with chronic active liver disease.Materials and methods. The RT PCR was used for research mutations in Mpl (W 515K and Mpl W 515L),to determine the degree of activity of enzymes studied the strokes of the peripheral blood.Results: HCV-infected patients of both groups have demonstrated more high frequency of strong mutation in W515L than in healthy people. The same trend had been observed in regards to mutation in W515K. In the group of CHC patients with thrombocytopenia level of glycogen was lower and activity of αANАE was higher than in the group of patients without thrombocytopenia. Essential difference of ATPase activity in both groups was not established.Summary. Expressed point mutations in platelet thrombopoietin receptors and the identified violations of the enzymatic activity of platelets, may serve as prognostic aggravate factors of the course of CHC

The influence of motor activity on the development of cardiac arrhythmias during experimental emotional stress

Experimental emotional stress which can produce various disorders of cardiac rhythm: sinus tachycardia, atrial fibrillation, ventricular, extrasystoles and paroxysmal ventricular tachysystoles was studied. In these conditions the adrenalin content in the blood and myocardium is increased 3 to 4 times. It is found that moderate motor activity leads to a relative decrease of adrenalin in the myocardium and arrest of cardiac arrhythmias