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Your search keyword '"Kotov N."' showing total 18 results
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18 results on '"Kotov N."'

1. Стан і тенденції розвитку систем охолодження приймально-передавальних модулів АФАР РЛС

Author

Nikolaenko, Yu. E., Bykov, E. B, Kon'ko, D. V., and Kotov, N. N.

Subjects
536.24, приемо-передающий модуль, cooling system, приймально-передавальний модуль, АФАР, APAA, heat pipe, теплова труба, transmit/receive module, тепловая труба, система охлаждения
Abstract

Наведено огляд існуючих конструкцій приймально-передавальних модулів (ППМ) для активних фазованих антенних решіток. Показана тенденція розвитку СВЧ елементної бази для побудови більш потужних ППМ. Розглянуто особливості застосовуваних і перспективних систем охолодження. Показана можливість використання теплових труб в системах охолодження ППМ. The report reviews the existing designs of transmit/receive modules (ТRMs) for active phased antenna arrays (APAA). The trend in the development of the super-high-frequency hardware components for building more powerful TRMs is shown. The features of the currently used and prospective cooling systems are examined. The possibility of using heat pipes in the cooling systems of the TRMs is demonstrated. Keywords: APAA, transmit/receive module, cooling system, heat pipe. Приведен обзор существующих конструкций приемопередающих модулей (ППМ) для активных фази-рованных антенных решеток. Показана тенденция развития СВЧ элементой базы для построения более мощных ППМ. Рассморены особенности применяемых и перспективных систем охлаждения. Показана возможность использования тепловых труб в системах охлаждения ППМ.

Published
2018

2. Использование трубобетона в сжатых элементах каркаса надстройки этажей малоэтажных жилых зданий

Author

I., Bol'shakov V., V., Savytskyi N., D., Nikiforova T., V., Razumova O., O., Grosman S., and A., Kotov N.

Subjects
житлові будівлі, reconstruction, frame, надбудова поверхів, надстройка этажей, floors superstructure, compressed elements, сжатые элементы, жилые здания, реконструкція, residential buildings, реконструкция, трубобетон, pipe-concrete, стиснуті елементи, каркас
Abstract

Summary. The article presents the results of the evaluation of different framework design solutions of superstructure floors of low-rise residential buildings. Purpose. Assessment of the effectiveness of pipe-concrete application for increase the number of storeys of low-rise residential buildings on the basis of the analysis of structural variants of resource consumption for variants of structural solutions of superstructure floors. Methods. A method of framework superstructure for additional floors of the reconstructed low-rise residential building without relocation of occupants has been proposed. The method consists in the organization of metal portal frames built along the walls of the existing building on the independent foundations, on which rest the girders, beams, ties and other structures taking the stresses of the superstructure. Results. Framework design solution for floors superstructure of low-rise residential building has been developed. The variants of framework with reinforced concrete, metal frame and framework of the pipe-concrete elements were analyzed. Based on the analysis of the stress-strain state of structural elements of framework, a comparative analysis of the consumption of materials for its construction was made. Scientific novelty. On the basis of the research it was found that the pipe-concrete structures meet the requirements of a rational joint work of steel and concrete. Practical value. The possibility of increasing the number of storeys of low-rise residential buildings with their reconstruction without the relocation of occupants., Аннотация. Представлены результаты оценки вариантов конструктивного решения каркаса надстройки этажей малоэтажного жилого здания. Цель работы. Оценка эффективности применения трубобетона для увеличения этажности малоэтажных жилых зданий на основе анализа ресурсоёмкости вариантов конструктивных решений каркаса надстройки этажей. Методика. Предложен метод надстройки каркаса дополнительных этажей реконструируемого малоэтажного жилого здания без отселения жильцов. Суть метода заключается в устройстве вдоль стен существующего здания на самостоятельных фундаментах металлических портальных рам каркаса, на которые опираются фермы, ригели, связи и другие конструкции, воспринимающие нагрузки от возводимой надстройки. Результаты. Разработано конструктивное решение каркаса надстройки этажей малоэтажного жилого здания. Рассмотрены варианты каркаса с применением монолитного железобетона, металлического каркаса и каркаса из трубобетонных элементов. На основе анализа напряженно-деформированного состояния элементов конструкций каркаса выполнен подбор сечений и сравнительный анализ расхода материалов на его возведение. Научная новизна. На основе выполненных исследований установлено, что трубобетонные конструкции отвечают требованиям рациональной совместной работы стали и бетона. Практическая значимость. Возможность увеличения этажности малоэтажных жилых зданий при их реконструкции без отселения жильцов., Анотація. Наведено результати оцінювання варіантів конструктивного рішення каркаса надбудови поверхів малоповерхового житлового будинку. Мета роботи. Оцінювання ефективності застосування трубобетону для збільшення поверховості малоповерхових житлових будинків на основі аналізу ресурсоємності варіантів конструктивних рішень каркаса надбудови поверхів. Методика. Запропоновано метод надбудови каркаса додаткових поверхів малоповерхового житлового будинку, що реконструюється без відселення мешканців. Суть методу полягає в улаштуванні уздовж стін існуючої будівлі на самостійних фундаментах металевих портальних рам каркаса, на які спираються ферми, ригелі, в'язі та інші конструкції, що приймають навантаження від конструкції надбудови. Результати. Розроблено конструктивне рішення каркаса надбудови поверхів малоповерхового житлового будинку. Розглянуто варіанти каркаса із застосуванням монолітного залізобетону, металевого каркаса і каркаса з трубобетонних елементів. На основі аналізу напружено-деформованого стану елементів конструкцій каркаса виконано підбір перерізів і порівняльний аналіз витрат матеріалів на його зведення. Наукова новизна. На основі виконаних досліджень установлено, що трубобетонні конструкції відповідають вимогам раціональної спільної роботи сталі і бетону. Практична значимість. Можливість збільшення поверховості малоповерхових житлових будинків у разі їх реконструкції без відселення мешканців.

Published
2016

3. Теплопотери многоэтажных зданий при различной ориентации и выполнении новых нормативных требований дбн в.2.6-31:2006

Author

Savickij, N. V. and Kotov, N. A.

Subjects
будівель, будівництво, Вимоги, Зданий, строительство, требованиий
Abstract

В статье обобщены сведения о факторах, влияющих на выбор глубины заложения и конструкции фундамента, изложены практические рекомендации для проектирования рациональных конструкций фундаментов малоэтажных зданий. Приведенные сведения и рекомендации могут быть полезными для строительства индивидуальных экологических зданий., У статті узагальнені відомості про фактори, що впливають на вибір глибини закладення і конструкції фундаменту, викладені практичні рекомендації для проектування раціональних конструкцій фундаментів малоповерхових будівель. Наведені відомості і рекомендації можуть бути корисними для будівництва індивідуальних екологічних будівель.

Published
2014

4. Обоснование эффективности выбора организационнотехнологических решений по утилизации битого кирпича при сносе гражданских зданий

Author

Dmitrenko, I. S., Martysh, A. A., and Kotov, N. A.

Subjects
utilization, bricks, demolition of buildings, утилизация, кирпич, снос зданий
Abstract

The article substantiates the expediency of obtaining brick rubble from the rubble of walls formed during the demolition of emergency residential buildings. The formulas for calculating the labor intensity and cost of 1 m3 of concrete mix on brick gravel are substantiated., В статье обосновывается целесообразность получения кирпичного щебня из обломков стен, образующихся при сносе аварийных жилых зданий.Приведены формулы для расчета трудоемкости и стоимости 1 м3 бетонной смеси на кирпичном щебне., У статье обосновується цілесообразность отримання кирпичного щебня з обломків стен, що утворюються при збиранні аварийних жирних приміщень.

Published
2011

5. [Experimental and modelling investigation of the mechanism of synaptic vesicles recycling].

Author

Zakharov AV, Petrov AM, Kotov NV, and Zefirov AL

Subjects
Animals, Mice, Microelectrodes, Motor Neurons metabolism, Motor Neurons physiology, Muscles innervation, Muscles physiology, Nerve Endings metabolism, Presynaptic Terminals metabolism, Presynaptic Terminals physiology, Rana ridibunda, Synaptic Transmission physiology, Endocytosis physiology, Exocytosis physiology, Models, Theoretical, Neuromuscular Junction metabolism, Synaptic Vesicles metabolism, Synaptic Vesicles physiology
Abstract

Under the condition of microelectrode recording and fluorescence microscopy with dye FM 1-43 the research of exo- endocytosis of synaptic vesicle in motor nerve terminals (NT) of frog cutaneous pectoris and white mice diaphragm muscles during high frequency stimulation (20 imp/s) was carried out. A mathematical modeling allowed us to conclude that the obtained experimental data can be explained in the following framework. Three pools of synaptic vesicles are involved in neurotransmitter release in the frog motor NT. Recovery of these pools is provided by endocytosis of two types: fast endocytosis with limited capacity and slow endocytosis. Fast-reconstructing vesicles refills the mobilization pool and slow endocytosis recovers the reserve pool. Our modelling investigation has revealed in frog NT independent recruiting of reserve and mobilization pools to the neurotransmitter secretion, i.e. this pools work concurrently. Experimental data, obtained on mice preparations, are well described with the framework of two-pools model including single type of endocytosis (fast endocytosis).

Published
2012

6. [Study of giant depolarizing activity in the neonatal hippocampal neurones].

Author

Safiulina VF, Kas'ianov AM, Murzina GB, Skorinkin AI, Kotov NB, Ezrokhi VL, and Giniatullin RA

Subjects
Animals, Animals, Newborn, Computer Simulation, Hippocampus drug effects, Hippocampus growth & development, In Vitro Techniques, Interneurons drug effects, Membrane Potentials physiology, Neural Networks, Computer, Pyramidal Cells drug effects, Rats, Rats, Wistar, Hippocampus physiology, Interneurons physiology, Pyramidal Cells physiology
Abstract

Spontaneous oscillatory activity is a general feature of developing neural networks. Early in postnatal development, spontaneous network-driven events, termed giant depolarizing potentials (GDPs), occur synchronously over the entire hippocampus. By performing simulation of hippocampal network with using physiology parameters of the neurons and its network from the present experiments and literature dates, we investigated the participation of the different components of network in the generation of GDPs. Comparing the results of the model and in vitro experiments we conclude that are necessary for the GDP generation involvement the activation of GABAergic, glutamatergic inputs and perhaps gap junction.

Published
2004

7. [Motor activity of paramecium].

Author

Kotov NV, Volchenko AM, Davydov DA, Kostyleva EK, Sadykov IKh, and Platov KV

Subjects
Animals, Models, Biological, Models, Theoretical, Cell Movement, Paramecium
Abstract

A systemic study of the mechanisms of motor activity of paramecium was carried out. The movements of paramecium responding to various influences were photographed. The analysis of the data revealed the time dependences of the rate of movement, rate of rotation, and the radius and the pitch of the helix trajectory. Mathematical models of the membrane and a unit that transforms the calcium signal to programs of regulating the effectors were constructed. A system of equations for constructing the trajectory of movement was proposed. It is concluded that the biomolecular system that involves calmodulin, calmodulin-dependent ionic channels, adenylate cyclase, guanylate cyclase, phosphodiesterases, Ca(2+)-calmodulin, cAMP, cGMP-dependent protein kinases, and phosphoprotein phosphatases is capable of regulating motor reactions necessary for complex maneuvering of paramecium under various conditions.

Published
2000

8. [Phosphorylase kinase: mathematic modeling].

Author

Davydov DA, Platov KV, and Kotov NV

Subjects
Calcium metabolism, Cyclic AMP metabolism, Models, Biological, Phosphorylation, Phosphorylase Kinase metabolism
Abstract

A mathematical model of the dynamic behavior of phosphorylase kinase was devised. Based on the results obtained, the function of this protein is discussed. It is suggested that phosphorylase kinase doses in a cAMP-dependent manner additional portions of glucoso-l-phosphate, which the muscle cell receives in response to contraction.

Published
2000

9. [Effects of induction propofol mono-narcosis on the central and cerebral hemodynamics].

Author

Grinberg BI, Levit AL, Kotov NB, and Piskunova OM

Subjects
Adult, Echocardiography, Homeostasis, Humans, Intubation, Intratracheal, Middle Aged, Ultrasonography, Doppler, Transcranial, Anesthetics, Intravenous pharmacology, Cerebrovascular Circulation drug effects, Hemodynamics drug effects, Propofol pharmacology
Abstract

Changes in the central hemodynamics were followed up by echocardiography and the linear velocity of the bloodflow by transcranial dopplerography in 15 patients with ASA classes I-II during induction bolus anesthesia with propofol in a dose 2.7 mg/kg without opioids. The diastolic and mean arterial pressure decreased by 12.3 and 15.4 %, respectively, the rate of cardiac contractions by 7.8%, cardiac index by 13.4%, and the resistive index on the radial and middle cerebral arteries by 13.4 and 10.2%, respectively, after administration of the above dose of propofol. The reaction to intubation of the trachea was the minimal, consisting in an increase of the mean and systolic arterial pressure by 22.2 and 22.7%, respectively, and of diastolic by 16.1%. The rest parameters were as initially. The linear velocity of the bloodflow in the middle cerebral artery did not reliably change. Hence, the central hemodynamic parameters are stable on condition that the deficit in the central bloodflow during induction anesthesia with propofol in a dose of 2.7 mg/kg is compensated for, adequate protection from intubation stress is provided, and autoregulation of the cerebral bloodflow is preserved.

Published
1997

10. [Mathematical modeling of the mechanism of cilia motion: an internal hydrodynamic drive].

Author

Kotov NV, Miroshnikov VV, and Iudin ID

Subjects
Biophysical Phenomena, Biophysics, Models, Theoretical, Cilia physiology
Abstract

A physical approach to the description of the motion mechanism of cilia based on the importance of hydrodynamical interactions between the intraciliary microstructures is proposed. The motion of the cilium model was investigated theoretically. A mechanism of synchronization of cilia beating in metachronal waves is proposed.

Published
1992

11. [Contamination of wild medicinal plants with cesium-137].

Author

Dmitriev SV, Fetisov AA, Pertsev VA, Kotov NN, Grinkevich NI, and Bakulina LA

Subjects
Radiometry, Russia, Soil Pollutants, Radioactive analysis, Cesium Radioisotopes analysis, Drug Contamination, Plants, Medicinal radiation effects, Soil Pollutants, Radioactive toxicity
Published
1991

12. [Experimental studies of the combined effect of styrene and general vibration].

Author

Rumiantsev GI, Prokhorov NI, Gubina NB, Karaoglanova TE, Kotov NA, and Okhrimenko SE

Subjects
Animals, Floors and Floorcoverings, Male, Rats, Styrene, Occupational Health, Styrenes toxicity, Textile Industry, Vibration adverse effects
Abstract

People working in modern carpet industry are exposed to a complex of factors of different origin, the most important among which are general vibration and styrene vapors. It has been found out in animal experiments simulating working conditions, that the central nervous system is the most sensitive both under an isolated and joint exposure to the factors. The joint exposure of animals to styrene and vibration may be evaluated as having different targets depending on the parameters under study.

Published
1990

13. [Effect of hypokinesia and +Gz loads on the transport function of blood in man].

Author

Khapilov NV, Panchenko VS, Kotov NN, and Asiamolov BF

Subjects
Adaptation, Physiological, Adult, Humans, Male, Posture, Acceleration, Blood Physiological Phenomena, Immobilization
Abstract

The results of 44 studies of circulation parameters and blood transport function of 14 test subjects exposed to 7-day bed rest (-10 degrees head-down tilt) and acceleration -4.5 Gz have demonstrated that the blood transport carriers and their actively binding centers form working structures in the adaptive reactions. As compared to the pretest level, the distribution ratio of 14C-adenine between two immiscible phases (plasma/oil, erythrocytes/oil) varies from -12 to 14% on bed rest day 3 to +32 to 40% on bed rest day 7; it increases by 145-150% after exposure to acceleration +4.5 Gz. The parameters of the blood transport function give a quantitative description of its adaptive reactions to environmental effects.

Published
1985

14. [Features of the clinical picture and diagnosis of nonspecific aorto-arteritis with lesions of the arch of the aorta].

Author

Tinigin PA, Kotov NB, Khlyzov VN, Fedorchenko VL, and Iakimova NIa

Subjects
Adult, Angiography, Aorta, Thoracic, Aortitis diagnosis, Arteritis complications, Blood Pressure, Brain Ischemia etiology, Female, Humans, Hypertension etiology, Ischemia etiology, Male, Middle Aged, Arteritis diagnosis
Abstract

A total of 68 patients with non-specific aortoarteritis (NAA) and the involvement of the aortic arch and its branches were observed. The onset of disease in a young age, a high frequency of cerebro-ischemic disorders and involvement of the other vascular regions, late diagnosis were typical signs. Knowledge of NAA clinical peculiarities, thorough examination of patients using physical and instrumental methods turned out decisive in diagnosis.

Published
1986

16. [Combined action of external radiation and of the products of air radiolysis].

Author

Golikov VIa, Karklinskaia ON, Mikhalev VP, Vorotyntsev AP, and Kotov NN

Subjects
Animals, Blood radiation effects, Dose-Response Relationship, Radiation, Gamma Rays adverse effects, Lethal Dose 50, Male, Mice, Nitrogen Oxides toxicity, Oxidative Phosphorylation radiation effects, Ozone toxicity, Spleen radiation effects, Time Factors, Air Pollutants toxicity, Air Pollutants, Radioactive toxicity, Radiation Effects
Published
1977

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