Известия Академии наук Республики Таджикистан. Отделение физикоматематических, химических, геологических и технических наук, №4(173), 2018 г. 
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Скачать  Sh.A.Khayrulloev  725 
On the zeros of arithmetic dirichlet series
without Euler product 
Inequalities A.A.Karatsuba for the number of zeros of the DavenportHeilbronn function in the short intervals of the critical line when the space has a shorter length has been proven. 

Ключевые слова: DavenportHeilbronn function; exponential pair; critical line; Dirichlet character; trigonometric sum.  

Скачать  M.Azizov , A.Mukhlis  2636 
Reconstruction and coding the solution of the Neymans task using trigonometrical polynomials and given information about boundary function 
In the paper the problem of restoring and coding solutions of the Neumans boundary value problem for given information about the boundary function is solved. 

Ключевые слова: reconstruction; coding; Neyman's marginal task; marginal function; trigonometrical polynom; information vector; optimal approximation.  

Скачать  V.D.Saynakov  3743 
Mean squared approximation of two variables functions with averaged trigonometric polynomials 
In this paper are described some problems of meansquared approximation of differentiable functions of two variables by averaged trigonometric polynomials. 

Ключевые слова: best mean squared approximation; generalized trigonometric polynomials.  

Скачать  F.Raimzoda  4453 
Exact inequalities containing best approximations and norm of differences in L 
The exact inequalities between the value of the best meansquare approximation of functions and the average value of the norm of differences of functions are found. For some classes of functions defined by the indicated differences, the problem of simultaneous approximation of functions and its successive derivatives by trigonometric polynomials in the metric of the space L is solved. 

Ключевые слова: best approximation; periodic of functions; trigonometric polynomial; modulus of continuity; difference of the mth order; joint approximation.  

Скачать  E.Kh.Safarzoda  5462 
Conditions for the dependence of the degree
of summability of Stepanov functions and
Fourier coefficients 
In this work, results are obtained that establish the dependences between the degree of summability of the almost periodic Stepanov functions and Fourier coefficients. As a characteristic of the structural properties of the function, the modulus of continuity of the considered function of higher order is used. 

Ключевые слова: almost periodic functions of Stepanov; Fourier series; Fourier coefficients; orthonormal system; trigonometric sums; degree of summability.  

Скачать  R.Mustafokulov  6372 
Analysis of one lineare nonhomogeneous differential equation of Eulers type 
In this work a linear nonhomogeneous differential equation of Eulers type of  th order is considered. For equations of this class the formula reducibility to equation with constant coefficients is indicated. The formula of integral representation of solution depending on root of an characteristic equation is presented. 

Ключевые слова: linear equation type of Euler; model equation; characteristics of equation; Cauchy function; determinant type Vandermonde.  

Скачать  O.Kh.Karimov  7383 
On the coercitive solvability of the nonlinear
LaplaceBeltrami equation in Hilbert space 
In this paper we obtain coercive estimates the nonlinear operator of LaplaceBeltrami flow in Hilbert space L(R) and on the basis of the coercive estimates its separability is proven. The coercive solvability of nonlinear equations of the LaplaceBeltrami in the space L(R) is investigated. 

Ключевые слова: LaplaceBeltrami operator; coercitive inequalities; nonlinearity; separability; solvability; Hilbert space.  

Скачать  K.S.Bachteev  8491 
Author identification by truncated text digital portraits 
Free text in Tajik is matched with two digital portraits taking into account the distribution of highfrequency and lowfrequency sentence lengths. On the example of three model collections of works, make it possible to determine individually the author of the printed text in nine cases of ten using different digital portraits. 

Ключевые слова: text; sentence; identification; identifier; digital portrait.  

Скачать  Z.Rustamov  9296 
About the hybrid method of automatic representation
of the tajik word form in persian graphical letter systems 
A program of studies of regularities has been outlined on the basis of the developed conceptual model underlying the correction of grammatical errors, made in the formal conversion of Tajik words form in Persian graphical letter systems from the same word forms specified in Cyrillic. 

Ключевые слова: language; Tajik; Persian; graphics; conversion.  

Скачать  Kh.B.Sharipov , K.Kabutov , I.H.Juraqulov , A.Safarov , F.Sultonov  97102 
The synthesis of titanium dioxide nanoparticles
from titanium trichloride and research
of its photocatalytic properties 
In the article, titanium trichloride was used to obtain various polymorphic modifications of titanium dioxide (anatase, rutile). TiO powders were obtained by thermal decomposition of amorphous TiO⋅nHO at various temperatures: 300, 400, 500 and 600°C. The influence of heat treatment conditions on the micromorphology and phase composition of TiO powders has been revealed. A study was carried out on the photocatalytic properties of TiO nanoparticles. 

Ключевые слова: titanium dioxide nanoparticles; anatase; rutile; titanium trichloride (titanium (III) chloride); thermal treatment; photocatalytic properties; adsorption.  

Скачать  D.O.Davlatov , Sh.B.Nazarov , Zh.A.Misratov , U.M.Mirsaidov  103111 
Technology joint processing of nepheline syenites of Turpi and damburites of the AkArkhar deposits of Tajikistan by sintering with sodium sulfate 
The results of complex processing of nepheline syenites of Turpy and danburate of AkArkhar fields of Tajikistan by the sintering method with sodium sulfate are presented. The optimal conditions for the ore sintering process are determined. The principal technological scheme of complex processing of ores with obtaining of such products as fertilizer, alumina, boric acid, iron oxide pigments, coagulants and building materials is offered. 

Ключевые слова: nepheline syenites; danburate; sodium sulfate; complex processing; sintering; alumina; boric acid; technological scheme.  

Скачать  O.A.Azizov , S.I.Bakum , A.Badalov , U.M.Mirsaidov  112116 
Specific of isolation and cleaning alumohydrides of potassium, rubidium and cesium 
The results of the purification of aluminum hydrides of potassium, rubidium, and cesium are presented. The conditions for cleaning and obtaining crystals with a basic substance content of more than 99% were found. 

Ключевые слова: aluminum hydrides; potassium; rubidium; cesium; purification; crystallization.  

Скачать  M.J.Isobaev , E.Kh.Pulatov , B.G.Mavlonov , T.Kh.Abdullaev , M.И.Djumaeva , I.F.Rakhimov  117124 
Amides and sulfamides of 1,3,4thiadiazines 
By interaction of thiosemicarbazone αhydroxykethone with the acetic anhydride which canalized by trifluoroacetic acid the amidothiadiazines were prepared. Sulfamidothiadiazines were synthesized by the reaction of aminotiadiazine with toluene sulfur chloride. The quantumchemical calculation of synthesized compounds carried out and based on results of minimum energy calculations. The conclusion about stable configuration of the intermediate and final products was done. 

Ключевые слова: acyl and sulfuramide derivatives; aminothiadiazines; thiosemicarbazones; quantumchemical calculation.  

Скачать  Z.H.Gaibullaeva , G.T.Nasimov  125131 
Fullfactorial planning of the process of hydrometallurgical extraction of lead from the galenitecontaining Bali concentrate (Turkey) 
The article examines the process of hydrometallurgical extraction of lead from galenacontaining concentrates from the Bali deposit (Turkey) in a solution of nitric acid. The obtained experimental data were analyzed using the fullfactorial experimental method of calculation and using the statistical software Minitab 15.0. 

Ключевые слова: lead; concentrate; hydrometallurgical method; leaching; ecology.  

Скачать  E.N.Sirodjidinov , I.N.Ganiev , Z.R.Obidov  132137 
Hightemperature oxidation of Zn55Al alloy,
doped with indium, in the firm condition 
The thermogravimetrical method the interaction of Zn55Al alloy, doped with indium, with air oxygen in an interval to temperature 473623K in the firm condition is investigated. Kinetic parameters of process of hightemperature oxidation of alloys are defined. It has been shown, that additives of indium within 0.010.05 wt.% slightly increase oxidability of an initial alloy, and products of oxidation of alloys are oxides AlO, ZnO ва InO. 

Ключевые слова: Zn55Al alloy; indium; thermo gravimetrical a method; hightemperature oxidation; speed of oxidation; energy of activation.  

Скачать  I.Sh.Ahmadshoev , N.P.Moukhamediev , A.H.Safiev , R.S.Rafiev , J.R.Ruziev , Sh.S.Jumaev , H.Safiev  138144 
Technology for producing flux with application
of electrolyt turnover 
The dependence of the melting temperature of the flux on the content of the components of the charge was studied. The optimal composition of the charge was revealed: waste  60%, fluorite concentrate of Talco Fluorite LLC  10% and electrolyte turnover of aluminum production  30%. Based on the results of the studies, a basic technological scheme for the production of flux based on electrolyte turnover of aluminum production was developed. 

Ключевые слова: fluorite concentrate; electrolyte turnover; flux; refining; industrial waste.  

Скачать  Dj.N.Fozilov , B.A.Alidodov  145151 
Trace element composition of coal deposits Shishkat 
It has been identified that deposits in coal seams Shishkat has higher concentration compared with their values сlarke tungsten, vanadium, silver, phosphorus, arsenic and germanium which are of interest in terms of the associated extraction of deposits during operation. The total metal content of coal, expressed in terms of an additive factor can be attributed to a group of highly metalliferous. 

Ключевые слова: field; the deposition; facies; clark; the concentration; ratio; the average content of; the mean anomaly; toxicity.  

Скачать  S.S.Saidrahmonzoda  152159 
Features of the deep structure and the choice
of the optimal design of exploration wells with the aim
of further exploration of the Mahram oil and gas area 
In the formation of oil and gas deposits in the western part of the Fergana depression, including in the Mahram area, deep tectonic disturbances play an important role, which divide the structure into blocks and serve as a way for the migration of hydrocarbons and their accumulation in Paleogene sediments. Therefore, the optimal choice of well design for each block guarantees a reduction in the cost of construction and an increase in the possibility of obtaining a positive result. 

Ключевые слова: tectonics; blocks; cost; construction; area; result; oil; gas; economy.  

Скачать  M.S.Safarov , A.R.Fazilov  160166 
The risks of natural disasters related to water and remote methods of their monitoring 
The article is devoted to the analysis of the risk of natural disasters in Tajikistan and the justification of the possibility of using unmanned aerial vehicles for monitoring and data collection. 

Ключевые слова: natural disasters; unmanned aerial vehicles; aerial photography.  
