69 research outputs found
Physicochemical properties of eutonic aqueous solutions of zinc and copper tetraammoniates in the range 293–323 K
No full textOptical Properties of Multilayered Sol–Gel Zinc-Oxide Films
No full textStudy of structural, optical and photocatalytic properties of multilayered (1–8 layers) zinc oxide films deposited on glass substrates by sol-gel method showed, that after thermal treatment at 500°C they consist of random oriented hexagonal crystalline grains with size of 34–40 nm, forming larger particles with sizes of 100–150 nm, which do not depend on number of layers. With an increase in the number of layers, the intensity of exciton photoluminescence decreases by a factor of 10, the absorption of light in the visible and near IR ranges increases, and the efficiency of photocatalytic decomposition of the test organic dye rhodamine B increases by 10–12%. The observed changes are related to the increase in the total area of grain boundaries and to the change in the integral amount of oxygen vacancies and interstitial atoms as the number of layers increases, which makes it possible to control the properties of zinc oxide films for applications in optoelectronics, photovoltaics and photocatalysis
Impact of porous silicon thickness on thermoelectric properties of silicon-germanium alloy films produced by electrochemical deposition of germanium into porous silicon matrices followed by rapid thermal annealing
No full textSilicon-germanium alloy films were formed by electrochemical deposition of germanium into porous silicon
matrices with thicknesses varying from 1.5 to 10 μm followed by subsequent rapid thermal processing at 950 ◦C
in an inert atmosphere. Study of the fabricated structures using SEM and Raman spectroscopy, as well as
measurements of their electrical conductivity and thermoelectric properties revealed that the highest Seebeck
coefficient ( 505 μV/K at 450 K) and Power Factor (1950 μW/(m⋅K2) at 400 K) values were obtained when a 5
μm-thick porous silicon was used as a structural matrix. Under such conditions, an optimal balance between
electrical conductivity, structural disorder and electrical insulation from the substrate is achieved due to the
presence of a residual porous underlayer, making it possible to maximize the film’s thermoelectric performance.
The obtained silicon-germanium alloy films are deemed suitable for the fabrication of both discrete and integrated
thermoelectric devices based on monocrystalline silicon substrates
EXPERIMENTAL RESEARCH OF DIURETIC PROPERTIES OF NEW 7-METHYL-N-BENZYL-8- SUBSTITUTED THEOPHYLLINE
No full textEXPERIMENTAL RESEARCH DIURETIC PROPERTIES OF NEW 7-METHYL-N-BENZYL-8-SUBSTITUTED THEOPHYLLINE.Matviychuk O.P., Gladchenko O.M., Matviychuk A.V., Ivanchenko D.G.National University of PharmacyZaporozhye State Medical UniversityIntroduction. Diuretics are widely used in the treatment of a number of diseases caused by a variety of diseases, in which the need to use these drugs. In many cases there is a clinical need to increase urine output for excretion of fluid, reducing its content in tissues and serous cavities. Especially great role of diuretic drugs in the treatment of patients with chronic congestive heart failure. Thanks to properties diuretics cause increased excretion of sodium and water from the body is given a real opportunity to actively influence the fluid and electrolyte disturbances in these patients.The use of diuretic agents (hydrochlorothiazide, furosemide, etacrynic acid, etc.) are often accompanied by side effects, which primarily relate to fluid and electrolyte homeostasis, acid-base balance, carbohydrate metabolism, phosphate, creatinine and uric acid.The search for new medicines that improve the functional activity of the kidneys, is one of the urgent problems of modern experimental pharmacology. Synthesis of modified analogs of biologically active substances of natural origin is a priority for research to address this issue.Given this, it was interesting to conduct forecasting of possible types of pharmacological activity of derivatives 7,8-disubstituted theophylline using the «PASS» (Predectum of Activity Spectra for Substances: Complex & Training), whose work is based on an analysis of dependencies "structure - activity".The results of the computer forecast derivative 7-p-metylbenzyl-8-substituted theophylline showed a high likelihood of these types of compounds of pharmacological activity, diuretical, spasmolytical, psycho-stimulant, analgesic, anti-inflammatory.Investigation methods. To solve the tasks as object of study was first taken 20 compounds synthesized derivatives of 7-n-metylbenzyl-8-substituted theophylline. The influence of new derivatives of p-20 metylbenzyl-8-substituted theophylline on renal function was performed on white male rats weighing 140-190 g Ye.B.Berhina method [1; 5]. Animals in the experiment were in individual metabolic cages adapted to collect urine. Number of animals in the group amounted to 5. Investigated derivatives intragastric administered at a dose of 1/100 of LD50. After 30 minutes, the rats were injected with tap water at the rate of 3 ml per100 g body weight. Urine recorded 2 hours to 4 hours. As a comparison drug used hydrochlorothiazide (hypothiazid) production «Sanofi Aventis»,France.Results and discussion. Study diuretic activity 7-p-metylbenzyl-8-substituted theophylline showed that these compounds affect renal function. Most of the studied derivatives showed diuretic activity, which used to range from 23.2% to 153.7%. Marked diuretic effect compound found 14 - 7 p-metylbenzyl-8-p-bromobenzylidenhidrazynoteofilin which stimulates excretory renal function in rats and increases urine 4 hours of observation at 153.7% (p <0.01).Thus, our experimental studies demonstrate the effectiveness of computer prediction. The results forecast for the derivatives of 7-n-metylbenzyl-8-substituted theophylline, envisaged a high probability vasodilatation (peripheral) and diuretic activities that were specifically synthesized to produce the intended biological activity that was confirmed by our experiments.Conclusions. Investigated derivatives of 7-n-metylbenzyl-8-substituted theophylline affect renal excretory function that confirms your computer forecast. The most severe action has diuretic compound 14 - 7- p-metylbenzyl-8-p-bromobenzylidenhydrasinotheophylline which revealed a strong diuretic activity that exceeds the effect hypothiazid 2 times. Among the studied compound found 14 derivatives with diuretic activity high, which makes it promising for further in-depth study of specific diuretic activity as a potential diuretic drug.References1. Berhyn, E. B. Methods Study novyh action of chemical compounds on kidney function // Chemical. Pharm. Zh. - 1977. - T. 11, № 5.- P. 3 - 11.2. Brukhanov, V. M., Zverev, J. F. Side effects of modern diuretics. - Novosibirsk, 2000. -242 p.3. Glaser, G. A. Diuretics. Guidelines for doctors. - M .: Interbuk Business, 1993. - 352 p.4. James A. Sheiman. Pathophysiology of the kidney. Trans. with Eng. 2nd ed., Rev. - M. - SPb .: "Publisher Binom" - "Nevsky Dialect", 1999. - 206 p.5. Preclinical studies of medicines. / Ed. O.V. Stefanova. - K .: Publishing house "Avicenna", 2001. - 528 p.6. Lapach, S. N. Statistic Methods in Medical and Biology with Research Using EXCEL / S. N. Lapach, A.V. Chubenko, P.N. Babich - K .: Morion, 2000. - 320 p.7. Mashkovskiy, M. D. Medicines / M. D. 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Technical Physics Letters V. 24, I. 10
No full textleave(s) : ill; 28 cm.Technical Physics Letters -- October 1998
Volume 24, Issue 10, pp. 747-828
OCTOBER 12, 1998
Investigation of plug extrusion processes in counterpropagating waves
A. K. Divakov, V. A. Ermolaev, N. I. Zhigacheva, Yu. I. Meshcheryakov, Yu. A. Petrov, S. A. Petrochenkov, and M. V. Sil'nikov
Full Text: PDF (207 kB)
Laws governing the reaction of a system
G. E. Skvortsov
Full Text: PDF (77 kB)
Mechanism of field-enhanced self-sustaining secondary electron emission in porous dielectrics
P. M. Shikhaliev
Full Text: PDF (68 kB)
Switching time of planar ferroelectric capacitors using strontium titanate and barium strontium titanate films
A. B. Kozyrev, O. I. Soldatenkov, and A. V. Ivanov
Full Text: PDF (72 kB)
Modified method of plasma-enhanced chemical vapor deposition of nanocrystalline silicon
V. G. Golubev, A. V. Medvedev, A. B. Pevtsov, and N. A. Feoktistov
Full Text: PDF (46 kB)
Decay dynamics of superheated states of liquid metals
A. P. Kubyshkin, F. Kh. Mirzoev, and V. Ya. Panchenko
Full Text: PDF (73 kB)
Metal���insulator cathode in an rf electron gun
N. I. Aizatskii, E. Z. Biller, V. A. Kushnir, V. V. Mitrochenko, I. V. Khodak, and V. F. Zhiglo
Full Text: PDF (103 kB)
Chain mechanism for initiation of hydrocarbon oxidation reactions in a low-temperature plasma
Yu. N. Novoselov, V. V. Ryzhov, and A. I. Suslov
Full Text: PDF (48 kB)
Adhesion mechanism of friction in nanotribocontacts
G. V. Dedkov
Full Text: PDF (71 kB)
Anisotropy of thin ferromagnetic films
A. V. Kovalev
Full Text: PDF (65 kB)
A new class of electrostatic systems which keep plane homogeneous charged-particle beams exactly parallel
L. G. Glikman and Yu. V. Goloskokov
Full Text: PDF (56 kB)
Formation of macroparticle structures in an rf induction discharge plasma
Yu. V. Gerasimov, A. P. Nefedov, V. A. Sinel'shchikov, and V. E. Fortov
Full Text: PDF (252 kB)
Modeling of a crossed-groove cavity in the 8 mm wavelength range
F. F. Baryshnikov, G. A. Bogatova, G. D. Bogomolov, V. V. Zavyalov, V. A. Ipatov, A. I. Kleev, V. V. Perebeinos, N. V. Cheburkin, and E. Yu. Shamparov
Full Text: PDF (63 kB)
Retention time and memory mechanism in ferrite powders
L. N. Kotov and V. N. Shaporov
Full Text: PDF (45 kB)
Hydrogen-induced phase transition in barium cerate
Yu. M. Baikov, V. M. Egorov, N. F. Kartenko, B. A-T. Melekh, Yu. P. Stepanov, and Yu. N. Filin
Full Text: PDF (42 kB)
Preparation and investigation of films of (Zn1 ��� xCdx)3(P1 ��� yAsy)2 solid solutions
V. M. Trukhan, V. F. Gremenok, V. V. Rubtsov, and I. A. Viktorov
Full Text: PDF (55 kB)
Preparation of thick YBa2Cu3O7 ��� delta films by dc magnetron sputtering
E. K. Hollmann, D. A. Plotkin, S. V. Razumov, and A. V. Tumarkin
Full Text: PDF (203 kB)
OCTOBER 26, 1998
Physical model for shock-wave initiation of detonation in pressed fine crystalline explosives
K. F. Grebenkin
Full Text: PDF (50 kB)
Active microwave pulse compressor utilizing an axisymmetric mode of a circular waveguide
A. L. Vikharev, A. M. Gorbachev, O. A. Ivanov, V. A. Isaev, S. V. Kuzikov, A. L. Kolysko, and M. I. Petelin
Full Text: PDF (199 kB)
On the generation of radiation defects by accelerated ions in silicon
A. M. Ivanov and N. B. Strokan
Full Text: PDF (81 kB)
Features of the emission spectrum of relativistic electrons moving in an ultraintense laser field
A. Kh. Khokonov, M. Kh. Khokonov, and R. M. Keshev
Full Text: PDF (92 kB)
Study of the surface of diamondlike carbon films doped with copper
V. I. Ivanov-Omskii, S. G. Yastrebov, O. A. Golubok, S. A. Masalov, and V. V. Rozanov
Full Text: PDF (544 kB)
Investigation of the characteristics of an ionization���neutron calorimeter in 4���70 GeV hadron beams at the IHEP accelerator
V. V. Ammosov, G. I. Merzon, T. Saito, K. Sasaki, V. A. Ryabov, A. P. Chubenko, and A. L. Shepetov
Full Text: PDF (72 kB)
Experiments on interferometric enhanced scattering in a plasma with a nonuniform magnetic field
E. Z. Gusakov, N. M. Kaganskaya, M. Kraemer, P. Morsinchik, and V. L. Selenin
Full Text: PDF (86 kB)
On the epitaxy of aluminum nitride on silicon substrates in a chloride���hydride process
A. N. Efimov, A. O. Lebedev, and A. M. Tsaregorodtsev
Full Text: PDF (461 kB)
Apparatus for growing GaN films on large-area substrates by the method of chloride���hydride vapor-phase epitaxy
S. I. Stepanov, D. V. Tsvetkov, and A. E. Cherenkov
Full Text: PDF (56 kB)
Observation of self-modulation regimes of generation in high-power backward-wave tubes
N. S. Ginzburg, N. I. Zaitsev, E. V. Ilyakov, I. S. Kulagin, Yu. V. Novozhilova, A. S. Sergeev, and A. K. Tkachenko
Full Text: PDF (95 kB)
Influence of a shock-wave pressure gradient on the appearance of a microhardness maximum in alpha-Fe irradiated by a high-power ion beam
A. N. Valyaev, A. D. Pogrebnyak, S. N. Bratushka, V. I. Lavrent'ev, S. N. Volkov, and S. V. Plotnikov
Full Text: PDF (71 kB)
Monitoring the deposition of an interference film by differential reflection of light
P. V. Adamson
Full Text: PDF (112 kB)
Spin���orbit interaction in the field of an optical vortex of a few-mode fiber
A. V. Volyar, V. Z. Zhilaitis, and V. G. Shvedov
Full Text: PDF (98 kB)The content contained herein is maintained and curated by the Preservation Department.This record is revised and maintained by the content administrators from the Cataloging & Metadata Department
X-ray film chamber with carbon target of Tien-Shan complex array
No full textX-ray films were exposed inside the ionization calorimeter under 74g/sq cm of carbon and 5 cm of lead. The X-ray film chamber area is 35 sq. m. Moving X-ray films were used, 50% of the events, which succeeded to determine incidence time, were identified with corresponding extensive air showers (EAS). For such events the size spectrum of associated EAS was derived. Two methods of energy measurement using X-ray films and ionization calorimeter were compared. The energy transfer from selected hadron to electromagnetic component is illustrated. It is found that in cascades with high energy release into electromagnetic components the hadron component is practically absent
Technical Physics Letters V. 24, I. 10
No full textTechnical Physics Letters -- October 1998
Volume 24, Issue 10, pp. 747-828
OCTOBER 12, 1998
Investigation of plug extrusion processes in counterpropagating waves
A. K. Divakov, V. A. Ermolaev, N. I. Zhigacheva, Yu. I. Meshcheryakov, Yu. A. Petrov, S. A. Petrochenkov, and M. V. Sil'nikov
Full Text: PDF (207 kB)
Laws governing the reaction of a system
G. E. Skvortsov
Full Text: PDF (77 kB)
Mechanism of field-enhanced self-sustaining secondary electron emission in porous dielectrics
P. M. Shikhaliev
Full Text: PDF (68 kB)
Switching time of planar ferroelectric capacitors using strontium titanate and barium strontium titanate films
A. B. Kozyrev, O. I. Soldatenkov, and A. V. Ivanov
Full Text: PDF (72 kB)
Modified method of plasma-enhanced chemical vapor deposition of nanocrystalline silicon
V. G. Golubev, A. V. Medvedev, A. B. Pevtsov, and N. A. Feoktistov
Full Text: PDF (46 kB)
Decay dynamics of superheated states of liquid metals
A. P. Kubyshkin, F. Kh. Mirzoev, and V. Ya. Panchenko
Full Text: PDF (73 kB)
Metal–insulator cathode in an rf electron gun
N. I. Aizatskii, E. Z. Biller, V. A. Kushnir, V. V. Mitrochenko, I. V. Khodak, and V. F. Zhiglo
Full Text: PDF (103 kB)
Chain mechanism for initiation of hydrocarbon oxidation reactions in a low-temperature plasma
Yu. N. Novoselov, V. V. Ryzhov, and A. I. Suslov
Full Text: PDF (48 kB)
Adhesion mechanism of friction in nanotribocontacts
G. V. Dedkov
Full Text: PDF (71 kB)
Anisotropy of thin ferromagnetic films
A. V. Kovalev
Full Text: PDF (65 kB)
A new class of electrostatic systems which keep plane homogeneous charged-particle beams exactly parallel
L. G. Glikman and Yu. V. Goloskokov
Full Text: PDF (56 kB)
Formation of macroparticle structures in an rf induction discharge plasma
Yu. V. Gerasimov, A. P. Nefedov, V. A. Sinel'shchikov, and V. E. Fortov
Full Text: PDF (252 kB)
Modeling of a crossed-groove cavity in the 8 mm wavelength range
F. F. Baryshnikov, G. A. Bogatova, G. D. Bogomolov, V. V. Zavyalov, V. A. Ipatov, A. I. Kleev, V. V. Perebeinos, N. V. Cheburkin, and E. Yu. Shamparov
Full Text: PDF (63 kB)
Retention time and memory mechanism in ferrite powders
L. N. Kotov and V. N. Shaporov
Full Text: PDF (45 kB)
Hydrogen-induced phase transition in barium cerate
Yu. M. Baikov, V. M. Egorov, N. F. Kartenko, B. A-T. Melekh, Yu. P. Stepanov, and Yu. N. Filin
Full Text: PDF (42 kB)
Preparation and investigation of films of (Zn1 – xCdx)3(P1 – yAsy)2 solid solutions
V. M. Trukhan, V. F. Gremenok, V. V. Rubtsov, and I. A. Viktorov
Full Text: PDF (55 kB)
Preparation of thick YBa2Cu3O7 – delta films by dc magnetron sputtering
E. K. Hollmann, D. A. Plotkin, S. V. Razumov, and A. V. Tumarkin
Full Text: PDF (203 kB)
OCTOBER 26, 1998
Physical model for shock-wave initiation of detonation in pressed fine crystalline explosives
K. F. Grebenkin
Full Text: PDF (50 kB)
Active microwave pulse compressor utilizing an axisymmetric mode of a circular waveguide
A. L. Vikharev, A. M. Gorbachev, O. A. Ivanov, V. A. Isaev, S. V. Kuzikov, A. L. Kolysko, and M. I. Petelin
Full Text: PDF (199 kB)
On the generation of radiation defects by accelerated ions in silicon
A. M. Ivanov and N. B. Strokan
Full Text: PDF (81 kB)
Features of the emission spectrum of relativistic electrons moving in an ultraintense laser field
A. Kh. Khokonov, M. Kh. Khokonov, and R. M. Keshev
Full Text: PDF (92 kB)
Study of the surface of diamondlike carbon films doped with copper
V. I. Ivanov-Omskii, S. G. Yastrebov, O. A. Golubok, S. A. Masalov, and V. V. Rozanov
Full Text: PDF (544 kB)
Investigation of the characteristics of an ionization–neutron calorimeter in 4–70 GeV hadron beams at the IHEP accelerator
V. V. Ammosov, G. I. Merzon, T. Saito, K. Sasaki, V. A. Ryabov, A. P. Chubenko, and A. L. Shepetov
Full Text: PDF (72 kB)
Experiments on interferometric enhanced scattering in a plasma with a nonuniform magnetic field
E. Z. Gusakov, N. M. Kaganskaya, M. Kraemer, P. Morsinchik, and V. L. Selenin
Full Text: PDF (86 kB)
On the epitaxy of aluminum nitride on silicon substrates in a chloride–hydride process
A. N. Efimov, A. O. Lebedev, and A. M. Tsaregorodtsev
Full Text: PDF (461 kB)
Apparatus for growing GaN films on large-area substrates by the method of chloride–hydride vapor-phase epitaxy
S. I. Stepanov, D. V. Tsvetkov, and A. E. Cherenkov
Full Text: PDF (56 kB)
Observation of self-modulation regimes of generation in high-power backward-wave tubes
N. S. Ginzburg, N. I. Zaitsev, E. V. Ilyakov, I. S. Kulagin, Yu. V. Novozhilova, A. S. Sergeev, and A. K. Tkachenko
Full Text: PDF (95 kB)
Influence of a shock-wave pressure gradient on the appearance of a microhardness maximum in alpha-Fe irradiated by a high-power ion beam
A. N. Valyaev, A. D. Pogrebnyak, S. N. Bratushka, V. I. Lavrent'ev, S. N. Volkov, and S. V. Plotnikov
Full Text: PDF (71 kB)
Monitoring the deposition of an interference film by differential reflection of light
P. V. Adamson
Full Text: PDF (112 kB)
Spin–orbit interaction in the field of an optical vortex of a few-mode fiber
A. V. Volyar, V. Z. Zhilaitis, and V. G. Shvedov
Full Text: PDF (98 kB)Archived web conten
Recovery Behavior of the Luminescence Peak from Graphitic Carbon Nitride as a Function of the Synthesis Temperature
No full textGraphitic carbon nitride (g-C3N4) is synthesized by thermal decomposition of thiourea and subsequent in situ polymerization of the products in the oxygen-containing ambient at 450–625 °C. The synthesized material contains oxygen at a concentration increasing with the processing temperature from 4.8 to 9.8 at %. The photoluminescence peak is found to be red-shifted with the temperature increased to 575 °C becoming then blue-shifted at higher temperatures. The observed red-shift of the photoluminescence peak is supposed to be caused by band-gap narrowing in g-C3N4 doped by oxygen while its recovery behavior is controlled by thermally induced oxygen-assisted disruption of sp2 bonds in C-N pi-orbital conjugated system of tri-s-triazine units building polymer sheets in g-C3N4
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