Известия Национальной академии наук Таджикистана. Отделение физикоматематических, химических, геологических и технических наук, №4(185), 2021 г. 
File  Article title and abstract  Pages 


Скачать  А.А.Eshonqulov  713 
On one algebra of twodimensional integral operators with an odd characteristic with a shift 
The paper studies the algebra of twodimensional singular integral operators with odd characteristic with shift, new classes of polykernels of Bergman operators in Lebegа space. Necessary and sufficient conditions are found for the above operators to be noetherian, and a formula is obtained for calculating the index. 

Ключевые слова: polykernfunction; polykernBergman operator; singular integral; operator symbol; operator index; operators noetherian.  

Скачать  E.M.Mukhsinov  1424 
Solvability of the pursuit problem for a linear differential game of a neutral type with integral restrictions 
In a Hilbert space, we consider the pursuit problem for a linear differential game of neutral type with integral constraints on the players' controls. Two theorems on the solvability of the pursuit problem are proved. 

Ключевые слова: pursuit problem; differential game of neutral type; Hilbert space; integral constraints; pursuit time.  

Скачать  F.Kholmurodov  2528 
Critical phenomena near the smecticisotropic liquid phase transition 
In this paper, we consider the influence of the smectic A phase transition on the pretransition phenomena in the isotropic phase of a nematic liquid crystal. It is shown that as the width of the nematic zone decreases, the regular part of the heat capacity increases, which leads to deviations from the Curie  Weiss law for the susceptibility from the root divergence from the heat capacity. 

Ключевые слова: phase transition; nematic zone; isotropic liquid; smectic phase; order parameter.  

Скачать  A.M.Ilolov  2938 
Catalysis and synthesis of catalyst 
In this article summarizes the basic aspects of catalysis. The synthesis of nanoheterogeneous zeolites  catalysts are considered. Synthesis of catalysts based on the impregnation method of the carrier with metal salts with the formation of a «crust» layer along the grain is shown. Solgel method used for formation binary MgSi catalyst are considered. 

Ключевые слова: catalysis; nanocatalysts; heterogeneous catalysis; solgel method.  

Скачать  A.S.Kurbonov , M.M.Tagoev , Sh.D.Otaev , A.Р.Tagаev , A.М.Kayumov , U.M.Mirsaidov  3944 
Comparative assessment and characteristics of the sintering process of boron and aluminosilicate ore with sodium and calcium chloride 
The results of a comparative assessment and characteristics of the sintering process of borosilicate ores and kaolin clays with chlorinecontaining reagents are presented in the article. The optimal parameters of sintering of boric ore of the AkArkhar deposit with sodium and calcium chlorides and sintering ofkaolin clays of the ChashmaSang deposit with CaClwith subsequent hydrochloric acid treatment of the sinter have been found.
Comparative assessments of the process of sintering boron and alumosilicate ores with sodium and calcium chlorides are given as well. 

Ключевые слова: sodium chloride; calcium chloride; boric ore; kaolin clay; optimal parameters; comparative assessment.  

Скачать  B.I.Asrorov , S.B.Bahriddinzoda , T.Nasimov , Z.H.Gaibullaeva  4552 
The catalytic process of obtaining hydride aluminum from hydrogen from coal gasification 
The article discusses the heterogeneous catalytic process of obtaining hydride aluminum hydrogen from coal gasification.
A palladium mobile was used as a catalyst for the preparation of aluminum hydride. Research used hydrogen obtained by coal gasification method. The work was used to be a sample of coal of the backgroundYagnobskoye field (Tajikistan) of the following composition, masses. %: Humidity  4.0; volatile components  0.98 %; resin  4.5 %; C  81.0; H  5.2; N  1.0; O  2.0; S  1,4; ash  5.3. The results obtained suggest that when processing aluminum chloride in the presence of a palladium catalyst atoms of hydrogen in the gas discharge stream, a rhombic modification of aluminum hydride with grid parameters are formed: а=0.534±0.005 нм; в=0.744±0.005 нм; с=0.575±0.005 нм. 

Ключевые слова: catalyst; palladium; hydride aluminum; hydrogen; restoration; water gas; gasification.  

Скачать  Sh.R.Samikhov , F.M.Toshov , Sh.A.Kurbanov , M.S.Ismoilova , S.Sh.Safarov  5359 
Mechanism and kinetics of decomposition of phosphorite minerals with hydrochloric acid solutions 
The results of studies on hydrochloric acid decomposition of phosphoruscontaining concentrates of Rivat deposit are presented. The kinetic parameters of this process are defined. 

Ключевые слова: concentrate; deposit; hydrochloric acid decomposition; process temperature; decomposition duration; extraction degree.  

Скачать  A.Badalov , F.A.Khamidov , D.T.Isozoda , D.N.Eshov , U.M.Mirsaidov  6065 
Modeling of change regularity of thermodynamic
properties of lanthanide borohydrides 
Thermodynamic characteristics of all line borohydrides have been clarified and/or determined by means of semiemperical method. The system analysis has been carried out and it has been determined that regularities of their changes depending on nature of lanthanides has complicated character with revealing of tetradeffect. The mathematical models of determined regularities for the borohydrides of cerium and yttrium subgroups have been composed. 

Ключевые слова: lanthanide borohydrides; thermodynamic characteristics; system analysis; changes regularities; mathematic modeling.  

Скачать  U.R.Jobirov , I.N.Ganiev , M.Ch.Shirinov , Z.R.Obidov  6671 
Oxidation of Zn0.5Al zinc alloy, doped with erbium,
in the firm condition 
The thermo gravimetrical method investigates interaction of Zn0.5Al zinc alloy, doped with erbium, with air oxygen in an interval to temperature 523  623K in the firm condition. Kinetic parameters of process of hightemperature oxidation of alloys are defined. Showed, that additives of erbium within 0.01÷1.0 wt.% slightly increase oxidability of an zinc alloy, and products of oxidation of alloys are oxides ZnO, AlO, AlO∙ZnO, ErO. 

Ключевые слова: Zn0.5Al alloy; erbium; thermo gravimetrical method; hightemperature oxidation; speed of oxidation; energy of activation.  

Скачать  M.М.Tagoev  7277 
Processing of boron and aluminosilicate ore of Tajikistan 
The article presents the results of the laboratory of complex processing of mineral raw materials and wastes of the V.I.Nikitin Institute of Chemistry of the National Academy of Sciences of Tajikistan in the field of processing boron and aluminosilicate ores. Acidic, chlorine and sintering processing methods have been found for boron raw materials. Basic technological schemes for processing raw materials with the production of boric acid, enamel, BCl and other useful components have been developed.
Processing methods have been found for aluminosilicate raw materials as well, optimal processing parameters have been determined and technological schemes for obtaining valuable products have been developed. 

Ключевые слова: processing; borosilicate ore; aluminosilicate ore; technological scheme; optimal parameters.  

Скачать  Z.S.Nazarov  7883 
Coprocessing of waste slurry field aluminum production with nepheline syenite of the Turpi deposit 
This article presents the results of joint sintering waste from the Talko sludge field and nepheline Turpi and the optimal sitering modest: t=900950C, the ratio of nepheline syenite and waste =1:2, the sintering duration 4060 mines, The solid residue was also decomposed with sulfuric acid after water treat ment of the sinter to obtain useful components for the production of aluminum. 

Ключевые слова: washed sludge; Industrial waste; waterinsoluble part; sinter; sulfuric acid decomposition.  

Скачать  M.M.Mamadvafoev , D.A.Davlatshoev  8491 
Sulfur in the intrusive complexes of the Kafandara ore field (Central Tajikistan) 
The article is the first to consider the distribution function of sulfur, its abundance and correlation with iron in 34 petrochemical different types, geologically different in age and tectonically different modes of intrusive rocks of the Southern Tien Shan in the position of the Kafandara ore field in Central Tajikistan. 

Ключевые слова: sulfur; distribution function; abundance in rocks; correlation with iron; Kafandara ore field.  

Скачать  A.K.Khodzhiev , J.H.Aminov  92101 
To geochemistry and geodynamic position of the Khojamafrach plagiogranitoid intrusive of the South Gissar zone, South TienShan 
In this article the geochemical features of the Khojamafraj pluton are analyzed and for the first time interpreted in the context of the tectonic plates theory. The analysis of the geochemical features of the rocks suggests that the intrusive rocks of the Khojamafrach pluton formed in an islans arc geodynamic conditions. 

Ключевые слова: South Gissar; Khojamafrach intrusion; geochemistry; gabbroplagiogranitoids; geodynamics.  

Скачать  Kh.S.Karimov , M.Tariq Chani , Batool Haider , A.C.Kodirov , J.Sh.Rahmatov , Kh.M.Akhmedov  102109 
Electric properties of the flexible sensor based on carbon nano tube and orange dye composite 
The article investigates the electrical properties of a flexible sensor based on a carbon nanotube and a composite with an orange dye obtained by rubbing in. It was shown that under the action of pressure up to 73.25 gs/cm, the initial resistance and impedance of the sensors at 200 kHz decreased three times (contact resistance) and five times (volume resistance). An increase in temperature from 30 to 86°C leads to a decrease in the resistance and impedance of the sensors. It was found that an increase in humidity from 50 to 91% leads to a decrease in the resistance and impedance of the sensors from 1.08 to 1.43 times. The research results can be used to lower the physical properties of a composite based on CNTs and organic semiconductors, in particular, an orange dye in electronic devices. 

Ключевые слова: carbon nanotubes; orange dye composite; resistance; impedance; pressure; temperature; humidity; sensor; composite; temperature coefficient of resistance.  

Скачать  J.N.Nizomov , I.K.Kalandarbekov , I.I.Kalandarbekov  110117 
On the calculation methods of loading systems of multistorey buildings based on discrete models 
The improvement of calculation methods is one of the main tasks of structural mechanics. A comparative analysis of numerical methods for calculating the loadbearing structures of buildings is presented. The results of a comparative analysis of the methods of concentrated deformations and finite elements are presented. 

Ключевые слова: constructive scheme; lumped deformation method; finite element method; discrete model; stressstrain state; stiffness matrix; compressiontension; compliance of real bonds; stiffness characteristic.  

Скачать   118122 



Ключевые слова: .  
