Известия Академии наук Республики Таджикистан. Отделение физико-математических, химических, геологических и технических наук, №2, 2016 г. |
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Скачать | Shabozov M.Sh., Langarshoev M.R. | 7-19 | On the best linear method of approximation of some classes of analytic functions in Khardi and Bergman spases |
In the Banach spaces of Hardy and weighted Bergman space the exact values of Bernshtein, Kolmogorov, Gelfand and linear n -widths for the classes of functions analytic in the unit circle that the averaged with weight of module of continuity of r order derivatives majorize by given function, satisfying some constraint are found. |
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Ключевые слова: наилучшие линейные методы приближения; модуль непрерывности; пространства Харди и Бергмана; мажоранта; n-поперечники; best linear method of approximation; modulus of continuity; Khardi and Bergman space; majorant; n-widths. | |
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Скачать | Tukhliev K. | 20-30 | Of the best approximation of certain classes of folds |
We find upper bounds of the best approximations of certain classes of periodic functions can be represented as a convolution of trigonometric polynomials, the structural characteristics of which are defined by various modifications of the moduli of continuity m -th order in the metric of L . |
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Ключевые слова: наилучшие приближения; периодическая функция; свёртка; тригонометрический полином; модуль непрерывности m-го порядка; best approximations; periodic function; convolution; trigonometric polynomial; module continuity of m-th order. | |
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Скачать | Yumagulov M.G., Arabov M.K. | 31-39 | Signs of Andronov-Hopf bifurcation for a dynamic system comprising a nonsmooth nonlinearity |
This paper is researched Andronov-Hopf bifurcation for differential equations, which contain non-smooth functions of modulus type in the right side. Using topological methods is defined signs of Andronov-Hopf bifurcation. |
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Ключевые слова: динамические системы; нелинейность; бифуркация; точки равновесия; периодические решения; операторные уравнения; dynamical systems; non-linear; bifurcation; stationary point; periodic solution; operator equation. | |
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Скачать | Saidov R.H. | 40-46 | Thermodynamic properties of alloys galfan I and galfan II doped with rare earth metals |
Investigated temperature dependence of the specific heat of the alloy Zn5Al and Zn55Al doped with scandium, yttrium, praseodymium, cerium, neodymium and europium. Determined the temperature dependence of the heat capacity, enthalpy, entropy and Gibbs energy. |
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Ключевые слова: сплавы; теплоемкость; редкоземельные металлы; alloys; specific heat; rare earth metals. | |
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Скачать | Tuichiev Sh., Rashidov D., Shoimov U., Tuichiev L., Aknazarova Sh. | 47-56 | The change of supramolecular morphology of elastomers under influence of external factors |
Atomic force microscopy, X-ray diffraction, optical microscopy and scattering of linearly polarized light were used to study the changes in the supramolecular structure of samples of synthetic rubber SKI-3 under influence of external factors. Intrafibrillyar periodicity is detected. A clear reversible transitions between the amorphous and crystalline-amorphous stats under the influence of factors such as temperature, strain, radiation and modification of fullerene Cwere studied; conducted evaluation of the elastic moduli of the crystal lattice of the elastomer along and across the direction of the chains. |
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Ключевые слова: эластомеры; атомно-силовая микроскопия; рентгенография; оптическая микроскопия; термодеформационное испытание; elastomers; atomic-force microscopy; X-ray; optical microscopy; thermodeformation test. | |
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Скачать | Karimov Kh.S., Akhmedov Kh.M., Khalid F.A., Murtaza I., Mehran Bashir M., Fatima N., Zaman H., Mirza D., Khan M.U. | 57-62 | Fabrication by inkjet printer of electronic deviees on the base of organic materials |
It is described fabrication by inkjet printer of humidity sensor, thermoelectric element. It is described the design of solar cell based on organic materials. As the ink it was used the colloidal solution that contained carbon nanotubes (CNT), surfactant and water. The thin film of CNT was printed on the paper substrate and the sensor was fabricated. |
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Ключевые слова: датчик влажности; термоэлектрический элемент; солнечный элемент; органические материалы; полупроводники; струйный принтер; коллоидный раствор; Sensor; thermoelectric cell; solar cell; organic material; semiconductors; printed; inkjet printer; colloid at solution. | |
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Скачать | Nizomov J.N., Kalandarbekov I., Kalandarbekov I.I. | 63-68 | Calculation of continuous beams of action of dynamic loads supported by concentrated deformation method |
The calculation of two-span continuous beam on the dynamic load action with supple legs. The show features the formation of the coefficient matrix and the stiffness matrix of the inner intermediate compliant supports. The results are compared with the analytical solution. |
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Ключевые слова: метод сосредоточенных деформаций; неразрезная балка; матрица внутренней жёсткости; диагональная матрица податливости; коэффициент жёсткости; матрица масс; матрица демпфирования; аналитическое решение; свободные колебания; method of lumped strain; continuous beam; internal stiffness matrix; a diagonal matrix of compliance; coefficient of rigidity; mass matrix; damping matrix; analytic solution; free oscillations. | |
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Скачать | Vakhobova R.U., Zaripova A.M., Khamzaeva G.Ch., Rachinskaia G.F., Bobiev G.M., Pachadjanov D.N. | 69-75 | Silver definition in coordination connections with isoleucine and tryptophan by inversion voltammetry method |
Possibility of studying and definition of ions of the silver which is in structure of coordination connections with isoleucine and tryptophan by a method classical inversion voltammetry method is shown. |
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Ключевые слова: микроконцентрации; серебро; координационные соединения; изолейцин; триптофан; инверсионная вольтамперометрия; microconcentration; silver; coordination compounds; isoleucine; tryptophan; inversion voltammetry. | |
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Скачать | Kurbonov A.S., Yatimov P.M., Yakubov Z.T., Mamatov E.D., Barotov A.M. | 76-80 | Comparative evaluation of chloric and acetic acid decomposition of danburite concentrate |
The comparative evaluation of chloric and acetic acid decomposition of danburite concentrate of Ak-Arkhar deposit of Tajikistan is given in present article. |
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Ключевые слова: данбурит; уксусная кислота; хлор; разложение; danburite; acetic acid; chlorine; decomposition. | |
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Скачать | Mirsaidov U.M., Akramov M.Yu., Badalov A. | 81-87 | Study of effects of the treatment of aluminum hydride with various acids at its thermal stability |
The effect of different acids on the stability of aluminum hydride in the aqueous acidic AlH processing is studied in the paper. The stabilizing effect of phosphoric acid on aluminum hydride is detected. |
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Ключевые слова: гидрид алюминия; кислотная обработка; термическая стабильность; aluminum hydride; phosphoric acid; thermal stability. | |
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Скачать | Valiev Yu.Ya., Safiev H., Boboev H.E., Majidov T.S., Rajabova J.A. | 88-93 | Physical and chemical analysis of kaolin clay of the ziddi deposits |
In the article present results of chemical analysis of the content of the main rock-forming oxides in Jurassic sedimentary rocks, ash of coal and carbonaceous rocks of the Ziddi deposits. Relatively high content of AlO (27.1 wt.%) in the kaolin clay of the deposits of "Ziddi" allows us to consider them as a promising raw material for the production of alumina refractories china and glass of liquid. |
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Ключевые слова: производство фарфора; технологические параметры; экспериментальные изделия; огнеупорные изделия; кварцевый концентрат; гравитационное обогащение; песчаные породы; porcelain production; process parameters; experimental products; refractories; quartz concentrate; gravity concentration; sandy rocks. | |
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Скачать | Juraev R.U., Olimov B.K. | 94-102 | Vahdats earthquake at 10 november 2013 |
The results of field survey of the effects of the earthquake occurred in Vahdat district 10.11.2013. The map of isoclines defined macro seismic earthquake parameters and confinement to geological structures area. The analysis of damage to building and structures, and identified the main causes, recommendations for their recovery. |
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Ключевые слова: макросейсмика; изосейста; балльность; магнитуда; сейсмостойкость; антисейсмические мероприятия; macro seismic; isoclines; magnitude; resistant-antiseismic. | |
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Скачать | Qadamov A., Ikromov I.I. | 103-110 | Stratification and mobility of water deposited sands in Vakhan Ishkashim Tajikistan |
The article presents the results of field measurements of sand mobility and it’s stratification in upper Ishkashim, in Vakhan. It was identified that the newly formed alluvial sands significantly changed their structure under the wind forcing during the season. Under the wind processing there is a “blind area” appeared on the soil surface, consisting mainly of “big” fractions. The distribution of the sand along the longitudinal and cross section of the valley mainly depend on wind characteristics. |
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Ключевые слова: стратификация; Ишкашимский район; аллювиальные пески; гранулометрический состав; Вахан; податливость и развеваемость песков; stratification; Ishkashim; alluvial sands; granulometric structure; Vakhan; surface compliance. | |
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Скачать | , , , , , , | 111-113 | |
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Скачать | , , | 114 | |
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