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(176), 2019 г.

Article title and abstractPages
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A.A.Kosimov , K.S.Baсhteev
Application of a specific digital portrait for identification of authors of text
A model collection of texts in Tajk, composed of 12 text by 5 authors is considered. Each text is associated with a digital portrait characterizing the distribution of frequencies of the sentences lengths in texts. The effectiveness of applying the -classifier for identifying authors of text is established.

Ключевые слова: Tajik language; text; frequency; classifier; identification.

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F.Rakhimi , Kh.Kh.Muminov , F.Sh.Shokirov , Q.M.Azizshoev , R.Bakhromzod , A.R.Muqumov , S.F.Odinaev , M.Sh.Imom , M.G.Shanbiev
Pamir Expedition 2019
The results of the work of the Pamir-2019 research expedition (July 09-20, 2019) at the high-altitude scientific research station for cosmic rays of the Ak-Arkhar tract in the Murghab region of the Gorno-Badakhshan Autonomous Region are presented. In particular, the radiation background of the Ak-Arkhar tract (at an altitude of 4360-4450 m) was monitored, a radiation map of the area was compiled, and a gamma-spectrometric analysis of representative samples of high-altitude soil was carried out.

Ключевые слова: Pamir experiment; cosmic ray; Ak-Arkhar tract; radiation monitoring.

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Kh.Kh.Muminov , Sh.F.Muhamedova
Some features of formation and evolution of dissipative breaters of the scalar nonlinear Schrödinger equation
In the paper some features of the formation and evolution of dissipative breathers of the scalar nonlinear Schrödinger equation with the attraction potential in an external oscillating field are discussed. By the numerical simulation methods, it has been shown that the two-solitonic solution of the scalar nonlinear Schrödinger equation with the attraction potential, under condensate boundary conditions, manifestating breather dynamics under non-zero motion velocity of the center of mass forms the stable dissipative breather of limit cycle in the presence of pumping by an external oscillating field, when its frequencies are reciprocal to eigenfrequencies of the breather oscillation.

Ключевые слова: dissipative breather; condensate boundary conditions; scalar nonlinear Schrödinger equation; attraction potential.

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Kh.G.Gafurov , B.I.Nazarov , S.F.Abdullaev
Method for forming multibite information in lasers with passive synchronization mod
The paper analyzes the ways of forming multibit information in passive mode synchronization lasers. The creation of a generation condition in a saturated absorber is a method of inputting information in a light pulse of a laser with synchronization of longitudinal modes. The greater the amount of information, the shorter the duration of the generated light pulse. The laser mode synchronization mode provides high stability of the formed multi-bit information, which is important for digital systems for receiving, storing, processing and transmitting data.

Ключевые слова: laser; active mode locking; passive mode locking; light pulse; ring resonator.

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D.Kh.Mirzoev , Sh.O.Azamov , U.M.Mirsaidov
Features of Tajikistan Ziddy deposit argillites processing by sintering with sodium hydroxide
The hydrochloric acid decomposition of argillites of the Ziddy deposit has been studied with preliminary sintering with sodium hydroxide, followed by dissolution of sinter in water and decomposition of it with hydrochloric acid. The optimal parameters for the extraction of useful components have been found and a basic technological flowchart for the processing of argillites by sintering with NaOH has been developed.

Ключевые слова: argillites; Ziddy; decomposition; sintering; sodium hydroxide; hydrochloric acid.

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S.E.Otajonov , I.N.Ganiev , M.Mahmudov , J.H.Jailoev , M.M Sangov
Strontium effects to anode behaviour of the alloy AK1M2
Corrosion of electrochemical behavior of the alloy AK1М2, alloying strontium in ambience of the electrolyte NaСl to investigated by potentiodynamic method. It is shown that additions strontium reduce the velocity to corrosions of the source alloy in 2 times in electrolyte NaCl.

Ключевые слова: alloy AК1М2; strontium; corrosion of electrochemical; anode behavior; electrolyte NaCl.

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M.B.Sharipova , M.B.Ikrami , K.K.Mirzorahimov
Influence of phenolic compounds on physicochemical properties of pasta
The paper deals with the development of technology for the production of pasta with the addition of a natural dye obtained from a walnut shell and the results of the study of the effect of this dye on the physical and chemical properties of the finished pasta.

Ключевые слова: pasta; phenolic compounds; extract; food dyes; food products.

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Engineering and geological features of the Mahram oil and gas field and the application of modern equipment and technology for drilling directional wells
The article shows that in difficult engineering and geological conditions of the earths surface on Mahram Square it is possible and advisable to use a new modification of the ZJ70/4500DB brand drilling rig, which contributes to significant drilling efficiency and productivity. Using a drilling rig of this class allows drilling directional wells with its location on land and reaching the deposits of the central block of Mahram area, located under the water of the Kairakkum reservoir.

Ключевые слова: drilling rig; drilling; oil and gas potential; reservoir; engineering-geological element; ground; physical and mechanical properties; chemical composition; platform.

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M.M.Mamadvafoev , D.A.Davlatshoev
Geochemistry of phosphorus magmatic rocks of kafandara ore field (Central Tajikistan)
The article provides information on the geochemistry of phosphorus in inverse (C) granitoid and alkaline rocks, their lamprophyric derivatives, post-inversion orogenic (P) acid dikes and taphrogenic (P) dikes of alkaline basaltoids; studied the distribution functions, prevalence and relationships of phosphorus with the composition of rocks of intrusive complexes

Ключевые слова: Central Tajikistan; Kafandara ore field; rocks; intrusive complexes; distribution functions of PO; phosphorus abundance; correlation of PO with the chemical composition of rocks.

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S.H.Negmatullaev , R.U.Juraev
Problems of estimation of seismic safety of metropolises of Central Asia
For the capitals of our region at one time complex of works were done for the estimations of consequences of potential strong earthquakes with the purpose of reduction of degree of seismic risk for building constructed mainly in soviet period. Existing to date problems in estimation of seismic vulnerability of the urbanized territories are examined on the example of researches for Dushanbe.

Ключевые слова: seismic risk; models of isoseists; nidal zone; seismic vulnerability.

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J.Niyazov , O.Kalashnikova , S.Mirzokhonova
The impact of climate change the flow of the Gunt river (a tributary of the Panj river, Amu Darya basin, Tajikistan) for the period 1940-2016
The study of changes in water level in the Amu Darya rivers basin in the runoff formation (the territory of the Republic of Tajikistan) in the context of global climate change, the threat of drying out of the Aral Sea and the increasing occurrence of natural disasters (mudflows, floods, etc.) has been a major challenge. According to long-term observations for the common period 1940-2016, the authors analyzed the mean annual and withinnyear to a change in Gunt River flow, the inflow to the Amu Darya River, and the influence of meteorological parameters on the flow change. The main hydrological and meteorological characteristics of the Gunt River basin are presented for the period 1940-2016. And also presents data on the area of glaciation for the period 1985-2015.

Ключевые слова: climate change; the flow of the river; the mean annual and withinnyear to a change in river flow; glaciers; the basin of the Gunt river.

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A.S.Kodirov , D.S.Husenov
Hydroecological assessment of the Vakhsh river basin
The study of the hydroecological characteristics of the Vakhsh river basin is an urgent task, and plays an important role for the development and improvement of the Action Program to assist the countries of the Aral Sea Basin (ASBP-4) and Strengthening the institutional and legal frameworks of the International Fund for Saving the Aral Sea. This program is being developed taking into account countries' commitments to the Sustainable Development Goals, the Paris Agreement on Climate Change and national programs to mitigate the effects of the Aral Sea crisis. A comprehensive assessment of the Aral Sea river basins is one of the most effective mechanisms for resolving the water, socio-economic and environmental problems that have arisen in the region in connection with the Aral crisis. In this regard, tasks were posed related to the study of the hydroecological characteristics of the Vakhsh river basin. During the study, we studied the hydrological regime of the Vakhsh river basin for the period 2001-2015 and the water quality of this basin.

Ключевые слова: Vakhsh river; hydrology; meteorology; ecology; mineralization; water quality.

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Q.Z.Olimov , I.I.Saidov
Method and methodology for developing a basin plan for managing water resources of the Zeravshan river
The article presents a new approach to the management of water resources in the Zeravshan river basin when applying the River Basin Water Plan system analysis for planning and organizing the work of water management systems. In connection with the water reform and to determine the optimal decision-making strategy in this article, the Zeravshan River Basin Water Plan uses the methodology and methodology for developing the Zeravshan River Basin Water Plan. In the future, it is necessary to develop acceptable algorithms and programs for solving the most important water management problems using a decision tree.

Ключевые слова: Water management system; Basin Plan; water management systems; integrated water resources management; water resources; water users; water users; on-farm; water reform.

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G.I.Kokhirova , F.Dzh.Rakhmatullaeva
International expedition to the Pamir astronomical observatory
In this paper have deals with an international expedition and a working trip to the Pamir astronomical Observatory, where they were organized and implemented in July and September 2018.

Ключевые слова: expedition; Pamir; observatory.

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