Доклады Академии наук Республики Таджикистан, том 59, №1-2, 2016 г.
|Article title and abstract||Pages|
About Fredholm solvability of exterior Dirichlet problem for a degenerate elliptic operator with summable coefficients
Fredholm solvability is investigated for higher-order elliptic operator given in exterior of a bounded domain Ω Ì R. Coefficients of the operator under consideration have power degeneration on the boundary ∂Ω of the domain Ω and at infinity. Lower coefficients of the operator belong to some L -spaces with power weights.
Key words: внешняя задача Дирихле; эллиптический оператор; степенное вырождение; фредгольмовая разрешимость; exterior Dirichlet problem; elliptic operator; power degeneration; Fredholm solvability.
|Khasanov Yu.Kh., Talbakov F.M.|
Analogue of the theorem S.N.Bernshteyn about the best approximation of almost periodic functions
The paper is devoted to investigation of a problem of approximation of almost periodic functions by entire functions with given spectrum in uniform metric. Also necessary and sufficient conditions for belonging of uniformly almost periodic functions to the class of entire functions are installed.
Key words: почти периодические функции; ряды Фурье; спектр функции; целые функции конечной степени; тригонометрические полиномы; наилучшее равномерное приближение; almost periodic functions; Fourier series; spectrum to function; entire functions of finite order; trigonometric polynomial; best uniform approximation.
Resonant properties of energy emited by randomly arranged oscillation sources
The resonant properties of energy emitted by Poisson-distributed point source of oscillation have been investigated.
Key words: распределенный по Пуассону точечный источник колебаний; Poisson-distributed point source of oscillation.
Approximation of continuous functions of two variables by -spline in metric
In this article the exact value of the upper bound of the deviations of φ -spline, interpolating functions of two variables for certain classes of functions defined by module of continuity in the uniform metric was found.
Key words: многогранная функция; модуль непрерывности; выпуклая функция; решётка узлов; polyhedral functions; module of continuity; convex function; lattice of nodes.
|Usmanov Z.D., Kosimov A.A.|
The bigram frequencies in tajik literature
It was established that frequencies of Tajik bigrams in classical and contemporary poetry and prose are statistically indistinguishable. The bigram data with the most frequencies are presented.
Key words: таджикский язык; биграмма; частотность; Tajik language; bigram; frequency.
|Babadzhanov P.B., Kokhirova G.I., Khamroev U.Kh.|
The object 2015TB145: asteroid or inactive comet?
The Earth-crossing asteroid 2015TB145 was discovered on 10 October 2015 and on 31 October 2015 approached the Earth at the minimal distance. On the base of obtained radio images of asteroid it was suggested that it really is a dead comet. For verification of the proposition the differential orbital evolution of the asteroid 2015TB145 was investigated under the perturbing action of major planets for the time interval of 100 thousand years. It was shown, that the object intersects the Earth’s orbit eight times during one cycle of variations of the argument of perihelion which is equal to about 40 thousand years. Consequently, if the object is of a cometary nature, it can be associated with a meteoroid stream producing eight meteor showers observable at the Earth. The features of theoretically predicted meteor showers associated with the 2015TB145 were calculated and the search for observable showers identical to predicted was conducted at the all published catalogues. It turned out, that seven from eight predicted showers were identified with the active observable meteor showers. It was concluded, that the near-Earth object 2015TB145 is really extinct nucleus of parent comet of revealed stream.
Key words: астероид; угасшая комета; орбита; эволюция; метеороидный рой; метеорный поток; asteroid; extinct; comet; orbit; evolution; meteoroid stream; meteor shower.
|Salikhov T.Kh., Abdurakhmonov A.A., Rahimi F.|
Influence of the thermal nonlinearity of the thermophysics values on the stationary temperature field of thin films dielectrics in the field of continuously proton beam
The effect of the temperature dependence of thermophysics values on the stationary temperature field of thin dielectrics with their proton beam irradiation in air has been theoretically studied. An expression describing the spatial distribution of the field шы obtained. The system of interconnection nonlinear algebraic equations for steady-state temperature of the irradiated and rear surfaces of the sample has been obtained. The comparison with the experimental data (for Kapton H types the polyimide film) has been done and the quite satisfactory agreement found between the results of theory and experiment.
Key words: температурное поле; радиационная физика; радиационная акустика; тепловая нелинейность; диэлектрик; полиимиды; temperature field; radiation physics; radiation acoustics; thermal nonlinearity; dielectric; polyimide.
|Nizomov Z., Asozoda M.Sh.|
The characteristics of the nanoparticles in aqueous solutions of acetates or sulfates of oneand divalent cations
Propagation speed of ultrasonic waves and the density of aqueous solutions of acetates or sulfates of one- and divalent cations in a wide range of salt concentration were measured. Hydration numbers and sizes of nanoparticles (hydrated ions) depending on concentration were estimated.
Key words: гидратные числа; радиус иона в растворе; водные растворы; ацетаты и сульфаты; hydration numbers; the radius of the ion in solution; aqueous solutions; acetates and sulfates.
|Kurbonov A.S., Barotov A.M., Nazarov F.A., Mirsaidov U.M.|
Decomposition of concentrate of borosilicate ore by sintering with calcium chloride
The results of study decomposition of concentrate danburite by sintering way in Ak-Arhar deposit in Tajikistan are present. Defined optimal conditions for decomposition danburite concentrate at a joint sintering with calcium chloride.
Key words: концентрат данбурита; переработка; спекание; разложение; извлечение; danburite concentrate; processing; sintering; decomposition; extraction.
|Iqbol G., Soliev L., Nizomov I.|
Solubility in the system CaСO-Са(НCO)-CaF-НО at 25ºс temperature
In manuscript the investigation of solubility at invariant points in the system CaСO-Са(НCO)-CaF-НО at 25ºС is presented. The solubility diagram of the title system is modeled according to the evidences obtained.
Key words: химический анализ; кристаллооптический анализ; диаграмма; жидкая фаза; твёрдая фаза; chemical analysis; crystal optical analysis; chart; liquid phase; solid phase.
|Moradi R., Hozhiboev Yu., Rahmonov R.O., Kukaniev M.A.|
The synthesis 6R-амide derivatives 5-оxо-5Н-7-phenyl-1,3,4-thiadiazolo-[3,2-а]-pyrimidine
This article presents a synthesis of certain novel 6R-amide derivatives 5-оxо-5Н-7-phenyl-1,3,4-thiadiazolo-[3,2-а]-pyrimidine via reaction of 5-оxо-5Н-6-ethylcarboxilate-7-phenyl-1,3,4-thiadiazolo-[3,2-а]-pyrimidine with derivatives of the amine. The structures of thecompounds obtained are set Н,С-NMR end IR-spectroscopy.
Key words: 6R-амидпроизводные-5-оксо-5Н-7-фенил-1,3,4-тиадиазоло-[3,2-а]-пиримидина; 5-оксо-5Н-6-этилкарбоксилат-7-фенил-1,3,4-тиадиазоло-[3,2-а]-пиримидина; синтез; реакции; 6R-amide derivatives-5-оxо-5Н-7-phenyl-1,3,4-thiadiazolo-[3,2-а]-pyrimidine; 5-оxо-5Н-6-ethylcarboxilate-7-phenyl-1,3,4-thiadiazolo-[3,2-а]-pyrimidine; synthesized; reaction.
|Ismonov R.D., Ganiev I.N., Odinaev H.O., Safarov A.M.|
Anodic behavior of the alloy Al +1%Be, doped with praseodymium and neodymium in the environment electrolyte 3% NaCl
By potentiodynamic methods the anodic behavior of alloy Al +1% Be, doped with praseodymium and neodymium in the environment of the electrolyte NaCl is investigated. The basic electrochemical properties of alloys and shown that the addition of rare earth metals decrease in the 2.0-2.5 times the rate of anodic corrosion of the initial alloy.
Key words: анодное поведение; алюминиевые сплавы; празеодим; неодим; коррозия; электрохимия; anodic behavior; aluminum alloys; praseodymium; neodymium; corrosion; electrochemistry.
|Faiziev A.R., Mahmadaliev A.G., Safaraliev N.S., Nabiev N.F.|
Temperature and composition of mineral-forming solutions stratiform deposits Baljuan ore district
This article the first provides information about the temperature and composition of the mineral-forming solutions stratiform lead-zinc deposits Baljuan ore district. The conclusion of these vibes are not associated with magmatic formations. Their heating was due to the depth of their circulation.
Key words: стратиформные свинцово-цинковые месторождения; температура; включения; кальцит; барит; минералообразующие растворы; stratiform lead-zinc deposits; temperature; inclusion; calcite; barite; mineral-forming solutions.
Assessment of biodiversity of wild medicinal plants of Semiganj gorge (Hissar range, Tajikistan)
The following results of the assessment of biodiversity of wild medicinal plants on the territory of the gorge Semiganj have been obtained. It was revealed that on the territory of the gorge there are most prevalent 60 species of medicinal plants, which are formed by representatives of 52 bloodlines belonging to24 different families.
Key words: биоразнообразие; семейства Fobaceae; Rosaceae; Asteraceae; Lamiaceae; biodiversity; families Fobaceae; Rosacea; Asteraceae; Lamiaceae.
|Kurbonov K.M., Daminova N.M., Gaziev Z.H., Kobilov I.I., Nurov Z.M.|
Perspectives of miniinvasive techniques in the diagnosis and treatment of postoperative peritonitis
In this work the prospects for the use of miniinvasive techniques in the diagnosis and treatment of 87 patients with postoperative peritonitis is presented. Complex ultrasound was performed in 75 patients, in 41(54.6%) observing it possible to reveal signs of peritonitis (free fluid in the abdominal cavity, the expansion loops of the small intestine etc.). Diagnostic laparoscopy was performed 32 patients, in 6 cases it possible to establish the PP, its sources and the prevalence and indications put laparotomy. In 26 (81.2%) cases, it is effectively transformed treatment benefit. Results showed that using modern miniinvasive techniques, such as ultrasound and laparoscopy are very highly effective methods that make it possible not only to diagnose development postoperative peritonitis and in some cases, will make it possible to effectively eliminate postoperative peritonitis source and adequate sanitation and drainage abdomen.
Key words: послеоперационный перитонит; постлапаротомная лапароскопия; релапароскопия; postoperative peritonitis; post laparotomy laparoscopy; relaparoscopy.
|Abdulloev J.A., Saifudinov Sh.Sh.|
Antireflux intervention in cholecystectomy for cholelithiasis for the prevention of reflux gastritis postcholecystectomy
This in works analyzed the results of diagnostic and correction videolaparoscopiс reflux gastritis in 35 patients exposed cholecystectomy about cholelithiasis. The result showed significant advantage videolaparoscopic correction reflux gastritis during cholecystectomy. Decreased incidence of postoperative complications in 4 times as compared with conrol group.
Key words: жёлчнокаменная болезнь; рефлюкс-гастрит; дуоденостаз; видеолапароскопическая коррекция; cholelithiasis; reflux-gastritis; duodenostasis; videolaparoscopiс correction.