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Page 1, Results: 4
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1.
Подробнее
22.6
M73
Minglibayev, M. Zh.
Differential equations of the planetary systems. [Текст] / M. Zh. Minglibayev, A. B. Kosherbayeva // Reports of the National Academy of Sciences of the Republic of Kazakhstan. - 2020. - №2. - P. 14-20
ББК 22.6
Рубрики: astrophysics
Кл.слова (ненормированные):
non-stationary star -- planetary systems -- variable mass -- the many -body problem -- osculating elements
Аннотация: In this article will be considered many spherical bodies problem with variable masses , varying non-isotropic at different rates as celestial -mechanical model of non-stationary planetary systems.
Держатели документа:
WKU
Доп.точки доступа:
Kosherbayeva, A.B.
M73
Minglibayev, M. Zh.
Differential equations of the planetary systems. [Текст] / M. Zh. Minglibayev, A. B. Kosherbayeva // Reports of the National Academy of Sciences of the Republic of Kazakhstan. - 2020. - №2. - P. 14-20
Рубрики: astrophysics
Кл.слова (ненормированные):
non-stationary star -- planetary systems -- variable mass -- the many -body problem -- osculating elements
Аннотация: In this article will be considered many spherical bodies problem with variable masses , varying non-isotropic at different rates as celestial -mechanical model of non-stationary planetary systems.
Держатели документа:
WKU
Доп.точки доступа:
Kosherbayeva, A.B.
2.
Подробнее
24
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
ББК 24
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
M23
Mamyrbekova, А.
Study of kinetics of copper oxidation by electrolysis under non-stationary conditions. [Текст] / А. Mamyrbekova, А. Mamyrbekova, M. К. Kassymova, A. Zh. Aitbayeva, O. N. Chechina // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 54-59
Рубрики: chemistry
Кл.слова (ненормированные):
copper electro-oxidation -- copper (I) oxide -- copper (II) oxide -- unsteady electrolysis -- electrolyte -- polarisation curves
Аннотация: The nature of the anion electrolyte affects the rate of copper anodic oxidation, while the process occurs more efficiently in solutions of sulfate and sodium chloride and is accompanied by significant polarisation. Based on the study of kinetics the possibility of obtaining powders of metal oxide was shown, which further allowed to determine the parameters of the electrolysis process in non-stationary conditions in order to obtain highly dispersed materials based on copper oxides with specific physico-chemical properties.
Держатели документа:
WKU
Доп.точки доступа:
Mamyrbekova, А.
Kassymova, M.К.
Aitbayeva, A.Zh.
Chechina, O.N.
3.
Подробнее
24
N94
Nurdillayeva, R. N.
Dissolution of stanless steel in sodium chloride solution at polarization by non-stationary current. [Текст] / R. N. Nurdillayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 75-81
ББК 24
Рубрики: chemistry
Кл.слова (ненормированные):
stainless steel -- titanium electrode -- alternating current -- iron (II) ions -- chromium (III)ions -- current density -- and current efficiency
Аннотация: Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of half-cycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2, іSS = 800 A/m2, [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).
Держатели документа:
WKU
Доп.точки доступа:
Sauirbay, Zh.G.
Bayeshov, A.B.
N94
Nurdillayeva, R. N.
Dissolution of stanless steel in sodium chloride solution at polarization by non-stationary current. [Текст] / R. N. Nurdillayeva // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №3. - P. 75-81
Рубрики: chemistry
Кл.слова (ненормированные):
stainless steel -- titanium electrode -- alternating current -- iron (II) ions -- chromium (III)ions -- current density -- and current efficiency
Аннотация: Stainless steel is in great demand due to its mechanical strength, heat resistance, and resistance to corrosive environments. This article presents the result of a study of the electrochemical dissolution behavior of a stainless steel electrode (12X18H10T) at polarization by 50 Hz alternating current in a neutral medium (NaCl). Preliminary experiments have shown that the main processes do not take place when two stainless steel electrodes are polarized with an alternating current. It was observed that by the polarization of the “stainless steel – titanium” pair electrodes with alternating current, the alloy is intensively dissolved with the formation of iron (II) and chromium (III) ions. This is due to the "valve" properties of the oxide layer formed on the surface of the titanium electrode. A change in the value of the current density of the titanium and steel electrodes significantly affects the process of electrochemical dissolution of the alloy. At high current densities, the dissolution rate of the alloy decreases due to the deterioration of the current correcting properties of titanium. With an increase in the electrolyte concentration, the current efficiency is reduced as salt passivation occurs. A maximum value of the current efficiency of dissolution of stainless steel was observed at a current frequency of 50 Hz. High frequencies of the alternating current do not provide an adjustable duration of the anodic half-cycle for the oxidation reaction due to the frequent change of half-cycles of the alternating current. It was observed that increasing the temperature of the electrolyte reduces the current efficiency of the electrochemical dissolution of stainless steel electrodes. The effects of main electrochemical parameters on the electrolysis process have been investigated, and the optimal conditions of the alloy dissolution were established (іТі = 60 kA/m2, іSS = 800 A/m2, [NaCl] = 2.0 M, t = 30, ν = 50 Hz.).
Держатели документа:
WKU
Доп.точки доступа:
Sauirbay, Zh.G.
Bayeshov, A.B.
4.
Подробнее
35
A36
Aliyeva, N. T.
Lubricating compositions for marine , locomotive and stationary diesels based on high -alkaline detergent-dispersant additives. [Текст] / N. T. Aliyeva, A. A. Javadova, K. Q. Efendiyeva, A. K. Mammadova, Z. K. Maharramova // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №4. - P. 14-18
ББК 35
Рубрики: chemical Technology
Кл.слова (ненормированные):
base oil -- engine oil -- diesel engines -- marine diesels -- locomotive diesel -- stationary diesel -- ubricating composition -- alkaline number -- acid number -- alkylphenol -- ondensation
Аннотация: the article describes new modifications of alkylphenolate type additives synthesized in the ANAS ICA , new lubricating compositions of motor oils M-14 Г2and М-14Г2ЦС (ГОСТ 12337) were created using additives AKİ-150 and AKİ-115B, which are calcium salts of condensation products of methylene bisalkylphenol with formaldehyde, aminoacetic acid and monoethanolamine containingboron and nitrogen with high and medium acid number.
Держатели документа:
WKU
Доп.точки доступа:
Javadova, A.A.
Efendiyeva, K.Q.
Mammadova, A.K.
Maharramova, Z.K.
A36
Aliyeva, N. T.
Lubricating compositions for marine , locomotive and stationary diesels based on high -alkaline detergent-dispersant additives. [Текст] / N. T. Aliyeva, A. A. Javadova, K. Q. Efendiyeva, A. K. Mammadova, Z. K. Maharramova // News of national academy of sciences of the republic of Kazakhstan. . - 2021. - №4. - P. 14-18
Рубрики: chemical Technology
Кл.слова (ненормированные):
base oil -- engine oil -- diesel engines -- marine diesels -- locomotive diesel -- stationary diesel -- ubricating composition -- alkaline number -- acid number -- alkylphenol -- ondensation
Аннотация: the article describes new modifications of alkylphenolate type additives synthesized in the ANAS ICA , new lubricating compositions of motor oils M-14 Г2and М-14Г2ЦС (ГОСТ 12337) were created using additives AKİ-150 and AKİ-115B, which are calcium salts of condensation products of methylene bisalkylphenol with formaldehyde, aminoacetic acid and monoethanolamine containingboron and nitrogen with high and medium acid number.
Держатели документа:
WKU
Доп.точки доступа:
Javadova, A.A.
Efendiyeva, K.Q.
Mammadova, A.K.
Maharramova, Z.K.
Page 1, Results: 4