of National Academy of Sciences
of Tajikistan

News of the National Academy of Sciences of Tajikistan.
Department of physical, mathematical, chemical, geological and technical sciences

Известия Академии наук Республики Таджикистан. Отделение физико-математических, химических, геологических и технических наук, №3, 2014 г.

Article title and abstractPages
Полный текст статьи

Tukhliev K.
About the best approximation of entire functions in space. II
An extremal problem on the best mean-square approximation of functions with integer functions of exponential type . The exact inequalities between the magnitudes of best approximation and integrals with the special modules of continuity of order related to Stecklov’s operator founded. For the -widths were calculated the exact mean values formulated by G.G.Magaril-Ilyaev for the classes functions satisfying the condition where - generalized modulus of continuity order derivative - the arbitrary increasing function

Ключевые слова: наилучшие приближения; модуль непрерывности m-го порядка; неравенство Джексона-Стечкина; целая функция экспоненциального типа; средние v-поперечники; the best approximation; modulus of continuity of m-order; Jakson-Stechkin type inequality; entire function of exponential type; the mean of v-widths.

Полный текст статьи

Fayziev M.G.
About degenerating nonclassical systems of the equations of the first order
In this article we considered the generalized of the first order nonclassical systems PDE and studied the solvability character of the boundary value problems in bounded and unbounded domains of the space .

Ключевые слова: неклассическая (составная) система уравнений; вырождающаяся система уравнений волновое уравнение; уравнение Эйлера-Пуассона-Дарбу (ЭПД); характеристический определитель; nonclassical (composite) system of equations; degenerating system of the equations; wave equation; equation of Euler-Poisson-Darboux (EPD); characteristic determinant; nonclassical (composite) system of equations; degenerating system of the equations; wave equation; equation of Euler-Poisson-Darboux (EPD); characteristic determinant.

Полный текст статьи

Borzdyko V.I.
About periodic solutions of delay inhomogeneous differential equations of parabolic type
A general delay inhomogeneous differential equation of parabolic type is reduced to a differential equation with an unbounded operator in a Banach space. It is proven the theorem about existence of a periodic solution using the theory about rotation of completely continuous vector fields. It is given for example the Hutchinson’s equation with diffusion which describes the number dynamics of a single population taking into account the migration of individuals.

Ключевые слова: банахово пространство; неограниченный оператор; вполне непрерывный оператор; вращение векторного поля; периодическое решение; динамика численности популяции; a Banach space; an unbounded operator; a completely continuous operator; the rotation of vector field; a periodic solution; the dynamics of populations size.

Полный текст статьи

Kuchakshoev Kh.S.
Investigation of -dimensional mathematical model of geothermal processes
In this paper automodelling solution for n - dimensional nonlinear equation describing the process of exploiting geothermal resources is considered. Automodelling solution was found in explicit form. In one dimensional case absolutely stable difference scheme is considered.

Ключевые слова: геотермальные ресурсы; автомодельное решение; разностная схема; geothermal resources; automodelling solution; difference scheme.

Полный текст статьи

Ahmedov R.
On a theory of the equation of a special form
In the paper a behavior of solutions to the model generalized Cauchy-Riemann System in a neighborhood of the singular point is investigated.

Ключевые слова: модельная обобщенная система Коши-Римана; сингулярная точка; представление решений; Generalized Cauchy; Riemann System; singular point; representation of solutions.

Полный текст статьи

Karimov Kh.S., Akhmedov Kh.M., Farhan Mudasar, Nisar Ahmed, Mehran Bashir M.
Fabrication and investigation of properties of demonstration thermoelectric generator on the base of Bi Te
In this paper the fabrication and investigation of properties of thermoelectric generator based on Bi Te are described. Voltage and current relationships on gradient of temperature and current-voltage characteristics at gradient temperature of 110 C were measured. The generator can be used for demonstration purposes.

Ключевые слова: коэффициент Зеебека; напряжение; термоэлектрический генератор; ток; теллурид висмута; эпоксидная смола; градиент температуры; Seebeck coefficient; voltage; thermoelectric generator; current; bismuth telluride; ethoxyline resin; gradient of temperature.

Полный текст статьи

Ismailov I.
Photoluminescence of theNeodimium Pentaphosphate Crystal Upon Exitation the Laser Radiation
Hes been lead the photoluminescence of neodymium pentophosphate (NdP O ) samples in the which photoluminescence has been exited by the radiation from stripe semiconductor geterolaser based on AlGaAS/GaAs with weve length λ=803,4nm at 77K and λ=856nm at 300K. Hes been indicate,what intensive the photoluminescence of neodymium pentophosphate to observe both at pamping by radiation of geterolaser, coinside with the band absorb, at pamping by radiation to lie outside of the band absorb.The confirmation that to be intensive the photoluminescence of kristal at paping by radiation of argonium laser with wevelengthλ=487nm.

Ключевые слова: кристалл; гетеролазер; диод; накачка; неодим; krystal; geterolaser; diod; pamping; neodimum.

Полный текст статьи

Okhunova U.R., Yunusov M.M.
The formation of phases in system RbF-CrF -HCOOH-H O
In article the information about researches of system RbF-CrF -HCOOH-H O at 25ºС had been learned with method of isothermal solution. Anolе became clear in this system at 25ºС concerning of concentration of RbF formatted CrF 3HCOOH, Rb CrF , Rb CrF and RbF HCOOH

Ключевые слова: изотермическая растворимость; система взаимодействия фторидов; метод Схрейнемакерса; isotope solubility; system interaction fluoride; method shreinemakers.

Полный текст статьи

Rahmatov N.N., Mirsadov I.U., , Khikmatov M., Mirsaidov U.M.
Soprsion of uranium ions from mine and drain waters using hotshot of juniperus dynamically
It is investigated sorption abilities of the hotshot of Juniperus in room temperature in the dynamic mode. It is determined that the hotshot of Juniperur has a good sorption properties and it concentrates 8.8% of uranium. Huge sorption volume makes it one of the most perspective materials for production of cheap sorbents.

Ключевые слова: уран; сорбция; шишки арчи; динамическая обменная ёмкость; uranium; sorption; the hotshot of juniper; dynamic exchange capacity.

Полный текст статьи

Azizov R.O., Saidov M.Kh.
Modeling of density thermal flow at gas-thermal drawing of coverings from polymeric materials
In clause is considered questions of modeling of density of a thermal flow at gas-thermal drawing of coverings.

Ключевые слова: тепловой поток; газотермический метод; полимерные материалы; газопламенное напыление; a thermal flow; gas-thermal a method; polymeric materials; flame spraying.

Полный текст статьи

Takranov R.L., Fayziev A.R., Dzaynukov A.B., Kantemirova A.T., Mutavaliev A.T.
Effect of fracture on skarn formation polymetallic ores in the field Altyntopkan (Zarnisor)
On the example of deposit Altyntopkan provides information on the impact of fracture on skarn formation - ores.

Ключевые слова: месторождение; Алтынтопкан; трещиноватость; скарн; проницаемость; влияние; deposit; fracture; skarn; permeability; influence; Altyntopkan.

Полный текст статьи

Mamadjonov Yu.
Absarokite-shoshonite-latite series of Tashkesken-Samgar volcanostructure of Chatkal-Kuramin zone of the Middle Tien-Shan
Within Tashkesken-Samgar structure Kurama subzone of Chatkal-Kurama zone of the Middle Tien-Shan for the first time was isolated absarokite-shoshonite-latite volcanic series in the volume of the late carboniferous - early Permian Shurab suite of the stratified sequence of the Upper Paleozoic. It is shown that the series are highly differentiated composition from basic volcanic - absarokites to acid - quartz latites - inclusive.

Ключевые слова: абсарокиты; шошониты; латиты; кварцевые латиты; петрохимия; мантия; палеоактивная окраина; Срединный Тянь-Шань; absarokites; shoshonites; latites; quartz latites; petrochemistry; mantle; paleoactive margin; Middle Tien-Shan.

Полный текст статьи

Muhidinov F.A.
Hydrogeological characteristics of the district of tunnel "Chormagzak" (Tajikistan)
In this paper we give a generalized characteristic the hydrogeological regime groundwater plot of the tunnel "Chormagzak" (the nature of bedding of ground waters, movement of groundwater the direction of, flow rate water springs aggressiveness towards concrete and iron).

Ключевые слова: осадки; рельеф; комплекс; водоносный горизонт; гидрогеология; дебит; химический состав; precipitation; relief; complex; aquifer; hydrogeology; debit; chemical composition.

Полный текст статьи


Ключевые слова: .