Results 1 - 10 of 11
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[en] Mutual adsorbtion of cesium and barium at Mo and Nb faces is studied by methods of thermoelectron emission. Effect of preliminary adsorbed barium on the adsorption heat of cesium is determined. It is shown that at (111) faces the shielding of elctrostatic interaction occurs and at its expense compensated is the decrease of Cs adsorbtion heat, connected with Coulomn interaction of dipoles of adatoms, unlike the faces (110) of Mo and Nb
[en] The short-term effect of low temperature exerts an essential influence on the growth and development of cotton plants. However, different forms and radiation mutants show different resistance to this factor. At the same time it is shown that the mutants do not differ essentially from the initial forms by their reaction to this factor. The inhibition of plant growth is associated with a decrease in electric conductivity of cotyledonous plant leaves, the latter being revealed in plants with low resistance rather than in those with high resistance
[en] Thermal coatings of zirconia partially stabilized with yttrium, deposited by low-temperature plasma, are the basis for the thermal protection of aircraft engine. At the same time there is an actual problem of selection of coating systems “ceramic layer - underlayer” of great thickness, providing better thermal protection, but having low strength characteristics due to the accumulation of internal stresses. To determine the optimal thickness of the test method used in the 4-point bending to allow the surface coating to explore in the elastic-plastic behavior of the field of coatings and strength. Based on the experimental results established the role of underlayer in the formation of the complex mechanical properties of thermal barrier coatings. With a well formed underlayer (PVNH16U6) system becomes sensitive to a change in thickness of the coating, to optimize the response on the strength and deformation criteria. According to the results the optimum ratio of the thickness of the ceramic layer and the underlayer should be regarded as the ratio of 3-5 for which the highest strength values were obtained for all the test coating systems. (paper)
[en] Acyclic diaminodiperoxides and cyclic azadiperoxides are synthesized by the reaction of 1,1-bis-(hydroperoxy)cycloalkanes with formaldehyde and primary arylamines in the presence of Sm-containing catalysts [SmCl3·6H2O, Sm(NO3)3·6H2O, SmCl3/γ-Al2O3, and Sm(NO3)3/γ-Al2O3]. The chemoselectivity of this three-component reaction depends on the position of the substituent (F,Cl) in the phenyl ring of the primary arylamines. Signals of the cyclic aminoperoxides were assigned considering the conformation dynamics of the tetraoxazocane cycle with two rigid peroxide bonds. The structure of the acyclic diaminodiperoxides was reliably determined by X-ray diffraction analysis. The synthesized acyclic diaminodiperoxides were found to exhibit anticancer activity.
[en] The paper presents the investigation of physical-mechanical and performance properties of the glass fiber reinforced polyurethane (PUR) materials made using the long fiber injection process. It was found that glass fiber reinforced polyurethane could be used to manufacture interior parts with different surface textures (instrument panels, door trim, armrests). (paper)
[en] The novel technique based on harmonic analysis of bioimpedance microvariations with original hard- and software complex incorporating a high-resolution impedance converter was used to assess the neural activity and circulation in human urinary bladder and penis in patients with pelvic pain, erectile dysfunction, and overactive bladder. The therapeutic effects of shock wave therapy and Botulinum toxin detrusor injections were evaluated quantitatively according to the spectral peaks at low 0.1 Hz frequency (M for Mayer wave), respiratory (R) and cardiac (C) rhythms with their harmonics. Enhanced baseline regional neural activity identified according to M and R peaks was found to be presumably sympathetic in pelvic pain patients, and parasympathetic – in patients with overactive bladder. Total pulsatile activity and pulsatile resonances found in the bladder as well as in the penile spectrum characterised regional circulation and vascular tone. The abnormal spectral parameters characteristic of the patients with genitourinary diseases shifted to the norm in the cases of efficient therapy. Bioimpedance harmonic analysis seems to be a potent tool to assess regional peculiarities of circulatory and autonomic nervous activity in the course of patient treatment.
[en] This paper describes the technology of modern engineering-plasma hardening steels and prospects of its application. It gives the opportunity to manage the process without using of cooling media, vacuum, special coatings to improve the absorptive capacity of hardened surfaces; the simplicity, the low cost, the maneuverability, a small size of the process equipment; a possibility of the automation and the robotization of technological process. (paper)
[en] Detonation carbon materials (DCM) composed of non-equilibrium nano-structures show the low-threshold field emission (LTFE). These materials have forward-looking application especially due to high reproducibility of the LTFE-phenomenon on a surface of emitter, where the emitting centers are homogeneously distributed. In this paper we link the effect of LTFE to the nature of the corresponding wave functions based on the experiment results obtained for DCM by the field effect on electrolytes. As we had shown before DCM had been described by an ultra-relativistic dispersion function with extremely small effective mass of electrons and the size-quantization effect had been observed in DCM at even room temperature. Our results based on emission and electrolyte technics of the field-effect measurements in DCM along with modern observations of the field emission in strong electric fields allowed to propose a new resonance transmission model for LTFE-phenomenon, which is alternative to most widely discussed models based on the field-enhancing factors or barrier-lowering mechanisms. -- Research highlights: → Detonation carbon materials show the low-threshold field emission. → Field emission and field effect in electrolyte technics of the measurements are combined. → We propose a new resonance transmission model for low-threshold field-emission phenomenon. → The model is alternative to items of field-enhancing factors or barrier-lowering mechanisms models.