Доклады Академии наук Республики Таджикистан, том 60, №11-12, 2017 г.
|Article title and abstract||Pages|
|Rakhmonov Z.Kh., Nozirov O.O.|
The distribution of Hardy-Littlewood numbers in arithmetic progressions with a difference equal to the power of a prime number
For , , - prime number, and - fixed natural numbers, , , , the asymptotic formula for the number of solutions of the congruence, has been derived the consequence of which is the upper bound for - the least Hardy-Littlewood number of the form , lying in the arithmetic progression with the difference and the initial term .
Key words: числа Харди-Литтлвуда; короткая сумма характеров; тригонометрические суммы с простыми числами; Hardy-Littlewood numbers; shorth sum of characters; exponential sums with prime numbers.
|Iskhokov S.A., Rahmonov B.A.|
Variational Dirichlet problem for second-order degenerate elliptic operators in the whole space
Solvability of the variational Dirichlet problem and a generalized eigenvalue problem for a class of second-order degenerate elliptic operators in the whole n -dimensional euclidian space is investigated. Formulation of the problems under consideration is connected with integro-differential sesquilinear forms that can not satisfy the coercitivity condition.
Key words: вариационная задача Дирихле; дискретный спектр; эллиптический оператор; степенное вырождение; некоэрцитивная форма; variational Dirichlet problem; discrete spectrum; elliptic operator; power degeneration; noncoercive form.
|Kokhirova G.I., Khamroev U.Kh., Kruychkov S.V., Nikolenko I.V., Barabanov S.I., Bakanas E.S., Mullo-Abdolov A.Sh., Abdulloev S.Kh.|
Synchronous observations of the binary asteroid 2005up156 during the close approach to the Earth
Synchronous astrometric and photometric observations of the asteroid 2005UP156 classified as fully synchronized binary system were carried out using Zeiss-1000 telescopes in the International Astronomical Observatory Sanglokh (IAOS) of the Institute of Astrophysics of the Ac. Sci. RT and the Simeiz branch of the Crimean astrophysical observatory of the Rus. Ac. Sci. The asteroid’s coordinates, apparent and absolute brightness in BVRI bands, color indexes were determined as well as the diameter and rotation period were estimated. Comparative analysis of joint observations has shown well consistency of obtained results.
Key words: астероид; астрометрия; фотометрия; координаты; кривая блеска; диаметр; период вращения; asteroid; astrometry; photometry; coordinates; light curve; diameter; rotation period.
|Salikhov T.Kh., Melikkhudzha N., Khojaev Yu.P., Khodjakhonov I.T.|
On the theory of the generation of the photoacoustics signal of the solids
The theory of generation of the PA signal is developed for the case when the substrate along with the sample is absorbing. A general expression is obtained for the complex amplitude of the temperature vibration in the buffer gas. It was found that the contribution from the absorbing substrate to the generated PA signal occurs only for thermal thin and weakly absorbing samples. Expressions describing the features of the generated PA - signal for the most interesting cases have been found.
Key words: фотоакустика; оптоакустика; photoacoustic; optoacoustic.
|Nizomov Z., Mirzoev F.M., Gulov B.N.|
Evaluation of the contribution of thermal radiation and convective exchange in the heat transfer coefficient of aluminum of different purity with natural air cooling
By the method of cooling the dependence of temperature of aluminum with different purity in the temperature range from 300 to 873 K with time was investigated. It is revealed that the cooling process of the samples is associated with thermal radiation and convective exchange. It is shown that with increasing temperature the proportion of thermal radiation in the cooling of metals increases.
Key words: охлаждение; тепловое излучение; конвективный обмен; температурная зависимость; алюминий; cooling; thermal radiation; convective exchange; temperature dependence; aluminum.
|Kurbonov A.S., Nazarov F.A., Yakubov Z.T., Nazarov Sh.B., Mirsaidov U.|
Kinetics of the process of sintering the burnt initial borosilicate ore in the application of NaOH
The kinetics study results of the decomposition of a prebaked borosilicate ore by sintering with sodium hydroxide are presented. The mechanism of the reactionsare determined, the kinetics of the sintering process is studied and the activation energies of the processes are calculated.
Key words: боросиликатная руда; кинетика; энергия активации; borosilicate ore; processing; energy activation.
|Ismonov R.D., Ganiev I.N., Odinazoda H.O., Safarov A.M.|
Potentiodynamic investigation of Al+1%Be alloy alloyed by gallium, in electrolyte medium of 0,03% NaCl
By potentiostatic method the basic electrochemical characteristics of the Al + 1% Be alloy with gallium were determined in the potentiodynamic mode with a potential sweep rate of 2 mV/s in a 0.03% NaCl electrolyte medium is studied. It is shown that the additions of the latter to 0.5% by weight, regardless of the composition of the electrolyte, reduce the corrosion rate of the initial alloy by 70%.
Key words: сплав алюминия с бериллием (Al+1%Be); галлий; анодное поведение; скорость коррозии; потенциал коррозии; потенциал питтингообразования; alloy aluminum with beryllium (Al+1%Be); gallium; anodic behavior; corrosion rate; corrosion potential; pitting potential.
|Norova M.T., Ganiev I.N., Maksudova M.S.|
Electrochemical characteristics of some alloys of aluminum with magnesium and with calcium in the medium of electrolyte NaCl
In this article about the study of electrochemical behavior of alloys AKa0.05 (Al + 0.05% Ca) with magnesium and AMg0.2 (Al + 0.2% Mg) with calcium in the medium of NaCl are reported . It is shown that alloying with magnesium decrease the corrosion rate by approximately 2.4 timesof the parent alloys, depending upon electrolyte concentration. Decreasing of the corrosion rates are associated with the process of the alloys passivation.
Key words: сплав АКа0.05; сплав AMг0.2; магний; кальций; потенциалы свободной коррозии и питтингообразования; скорость коррозии; анодные поляризационные кривые; электролит NaCl; alloy AK0.05; AMg0.2 alloy; magnesium; calcium; free corrosion potentials; pitting; corrosion rate; anodic polarization curves; NaCl electrolyte.
|Shuhratzoda M., Rajabov U.R., Turdiev SH.A., Sharipova M.M., Davlatov M.N.|
Synthesis and biological properties of the coordination compound of silver with metronidazole
On the basis of oxidative capacity and oxidative function studies, a complex compound of silver (I) with metronidazole was synthesized. Was established harmlessness, an allergenic property and a lethal dose of a substance, Diffusion method was used to determine the antimicrobial property of the substance under study. It became clear that the complex with a meter is low-toxic and a certain dose can be used in agriculture for the treatment of animals.
Key words: координационные соединения; серебро; метронидазол; Метрарг; complex compounds; argentum; metronidazole; Metrarg.
|Faiziev F.A., Fayziev A.R., Mahmadkarim K.|
About kadmiy containing fashion from Mushiston deposit (Central Tajikistan)
At the Mushiston deposit, a cadmium containing sphalerite - pribramite - was first established.
Key words: месторождение Мушистон; сфалерит; содержание; рудные минералы; Mushiston deposit; sphalerite; content; ore minerals.
|Fozilov Dj.N., Valiev Sh.F., Alidodov B.A.|
Environmental problems of the development of coal deposits in Tajikistan
Switching to fuel energy and large-scale development of coal deposits in Tajikistan it is inevitably accompanied by the deterioration of the ecological environment obektanoski. It is expressed mainly in the occupation of land for dumps, violation of the natural landscape, pollution of soil, water bodies and the atmosphere solid and gaseous impurities, which requires, first of all, the use of modern tools and utilization of coal waste.
Key words: подземная разработка; угольные отходы; вредные горные выработки; фильтрация; загрязнения; окружающая среда; underground; development; coal; drainage; harmful; environment; mining; production; filtering.
|Hisoriev H.H., Ebadi A.G.|
A new floristically findings of blue-green algae (Cyanoprokaryota) from Tajan river basin (Eron)
There are 20 species of blue-green algae or cyanobacteria (Cyanoprokaryota) are shown as a new geographically findings for Algae Flora of Iran, which were found in water bodies of Tajan river basin. Totally there 69 species and interspecific of blue-green algae were found in 9 stations of Tajan river basin. In this article we presented bio-morphological information about 20 species of Cyanoprokaryota.
Key words: новые флористические находки; синезелёные водоросли; р. Таджан; Иран; new findings; blue green algae; Tajan river; Iran.
|Sattorov B.N., Niyzmuhamedova M.B., Kosumbekova F., Kamolov N., Rahimov M.M.|
The dynamics of leaves area formation in local and introduced varieties of wheat growing in the arid conditions
The formation of the total leaves area of wheat plants during vegetation period in the arid conditions and, as well as the leaf area index (LAI). The hard of arid conditions revealed the reaction of studied wheat varieties to stressful growing conditions. The total of leaves surface was maximal in the earling phase in wheat varieties Volzhskaya 100, Volzhskaya С (light), and in Volzhskaya K (qualitative) and Zafar (standard). The maximum total of leaves surface in the flowering phase is observed.
Key words: пшеница; листья; площадь листьев; индекс листовой поверхности; wheat; leaves; leaf area; leaf index.
|Dodkhoeva M.F., Sharipova M.I.|
Disease incidence of female population in the regions with ecologically unfavorable environment
Researches, conducted in the tailings storage region revealed a high frequency of somatic and genital diseases of the women with different age groups irrespective of the farness and duration of their living in the radiation pollution of environment region. An additional point is that, an analysis of the obtained results of researches showed an increased level of reactive oxygen species in the blood of many women living in the tailings storage zone, which can adversely affect the body’s antioxidant system and the ability to develop various pathological processes, as evidenced by the abundance of genital and extragenital diseased in the respondent women.
Key words: радиация; доза; заболеваемость; женщины репродуктивного периода; экологическое неблагополучие; radiation; disease incidence; women of reproductive period; environmental ill-being.
The index of clauses published in 2017
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The author’s index
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