27 research outputs found
The Game Theory Application in the Transport Flows Control Algorithm Development in the Intelligent Transport System
No full textTraffic management in modern intelligent transport systems includes monitoring the actual traffic situation in real time (volumes, speeds, incidents, etc.) and management or controlling transport traffic using this information. At the same time, cars as intelligent transport systems components must be equipped with communication capabilities for exchanging information with other vehicles (V2V) and with road infrastructure (V2I). All this is connected with the presence of special equipment connected to the on-board network for local data collection, which can be exchanged between cars and with a central communication station using wireless Internet. At the same time, the issue of developing the traffic organization algorithms themselves is still open. This problem can be solved with the help of game theory, a fairly new but rapidly developing part of modern mathematics. Unlike optimization theory, which studies the possibilities of constructing an optimal solution for the entire system as a whole, game theory studies ways to optimize individual benefits in competition with other persons (events) that rationally seek to satisfy their own benefits. The problem of “smart” regulation of intersections is quite difficult to solve, it combines the efforts of scientists from different fields of knowledge. However, the rapid development of ICT technologies and their rapid application to transport tasks makes it possible to develop some approaches to optimize the current situation at the intersection
Scientometric Dimensions of Innovation Communication Productivity of the Chemistry Division at Bhabha Atomic Research Centre
No full textScientrometric analysis of 1733 papers published by the teams comprising total of 926 participating scientists at Chemistry Division of Bhabha Atomic Research Centre (BARC) during 1970-1999 in the domains: Radiation & Photochemistry and Chemical Dynamics (649), Solid State Studies (558), Inorganic, Structural and Materials Chemistry (460) and Theoretical Chemistry (66) were analysed for yearwise productivity, authorship pattern and collaboration. The highest number of publicationsin a year were 98 and 104 produced in 1989 and 1996 respectively. Average number of publications per year were 57.76. Highest collaboration coefficient 1.0 was in 1977 and 1999.
The authors with most prolific publications were J. P. Mittal (204), R. M. Iyer (190), J. V. Yakhmi (156), V. K. Jain (106), Hari Mohan (96), K. N. Rao (92), I. K. Gopalakrishnan (80), P. N. Moorthy (78), T. Mukherjee (77), and S. K. Kulshreshtha (74).
The core journals preferred for publishing with high number of publications were: Indian Journal of chemistry - A (96), Radiation Physics and Chemistry (92), Chemical Physics Letters (67), Journal of Physical Chemistry (59) and Indian Journal of Chemistry (45). Publication concentration was (28.57%) and publication density was (5.48). Top ranking journals publishing chemistry division,BARC publications were from UK (471), India (326), The Netherlands (302), USA (277) and Switzerland (104)
Разработка подхода к проектированию и расчету безвоздушного колеса электрического самоката
No full textA. T. Volochko, S. N. Yankevich. DEVELOPMENT OF AN APPROACH TO THE DESIGN AND CALCULATION OF A N AIRLESS WHEEL FOR AN ELECTRIC SCOOTERПредложена методика расчета безвоздушного колеса электрического самоката, основанная на применении системного подхода. Выполнен анализ безвоздушного колеса как механической системы с учетом внешнего нагружения, представлен расчет внешних нагрузок и жесткости безвоздушного колеса и обоснование его конструктивного исполнения, предложена методика выбора конструктивных параметров спиц безвоздушного колеса электрического самоката и выполнен синтез конструкции безвоздушного колеса с помощью метода конечных элементов. Приведенные зависимости учитывают как конструктивные параметры самоката и применяемого колеса, так и массу водителя. Они могут быть использованы при анализе нагруженности безвоздушного колеса, объединяющего функции колеса и амортизатора при разработке методики сравнительных экспериментальных исследований безвоздушных колес для самокатов
Publication productivity of the Bio-organic division at Bhabha Atomic Research Centre : a scientometric study
No full textAttempts to analyse quantitatively 475 papers published by the Bio-Organic Division of Bhabha Atomic Research Centre during 1972–2002 in various domains like Synthesis (202), Bioorganic Chemistry (100), Biotechnology (70), Natural Products (53), Waste Management (30), Supra-molecular Chemistry (18) and Organic Spectroscopy (2). The highest number of publications in a year were 38 in 2001. The average number of publications per year was 15.3 and the highest collaboration coefficient 1.0 was found in the years 1972,1976-1977,1980-1985,1987,1989-1990 and 1993. The most prolific authors were: A. Banerji (125), V. R. Mamdapur (93), S. Chattopadhyay (86), M. S. Chadha (61), S. K. Nayak (37), A. Chattopadhyay (30), L. P. Badheka (26), G. J. Chintalwar (26), S.K. Ghosh (25), and N. B. Mulchandani (25). The core journals preferred by the scientists to publish their papers include: Indian Journal of Chemistry-B (56), Tetrahedron Letters (20), Synthetic Communications (15), Journal of Organic Chemistry (14), Biotechnology Letters (12), Phytochemistry (12), Tetrahedron Asymmetry (11), Journal of Chemical Society- Perkin Transactions –I (10) and Molecules(10)
Exhaust Gas Cleaning of Internal Combustion Engine Manufactured by JSC “Motovilo”
No full textВ настоящее время наиболее универсальным методом снижения содержания вредных примесей в отработавших газах признано каталитическое дожигание. Известны каталитические системы для дожига всех нормируемых компонентов или их комбинаций (трехмаршрутные катализаторы). Вместе с тем вопрос создания новых конструкторско-технологических решений по-прежнему остается актуальным в связи с тем, что применение штатной системы на конкретном двигателе внутреннего сгорания, как правило, сопровождается рядом затруднений. В статье рассматриваются исследования по разработке каталитического нейтрализатора для бензиновых мотоциклетных двигателей
Orthostatic Hemodynamic Changes in Brain Damage
No full textAim: to study orthostatic hemodynamic changes in patients with chronic disorders of consciousness after critical brain damage.Materials and methods. We studied 30 patients (10 women and 20 men) with chronic disorders of consciousness after severe brain damage aged 45±7 years, 10 of which were in the vegetative state (VS) and 20 had the minimally conscious state (MCS). The main causes of brain damage were traumatic brain injury (53% of patients) and cerebrovascular accidents (CVA) (23.3%). The rest of the patients had posthypoxic encephalopathy or were after brain tumor removal surgery. Passive orthostatic test (POT) 0° to 60° to 0° was performed using an electrically driven tilt table (Vario Line). Hemodynamic monitoring during the verticalization was done using a non-invasive oscillometric recording of blood pressure on the brachial artery, stroke volume (SV) and cardiac minute output (CMO) were measured by impedance cardiography with the multifunctional «Task Force Monitor 3010i» (CNSystem, Austria). Data were statistically analyzed using the Statistica 10 software package.Results. Orthostatic hemodynamic stability was found in 26 out of 30 patients with chronic disorders of consciousness after critical brain damage. It was manifested by stable systolic blood pressure (SBP) in tilted orthostatic and horizontal position (120.7±2.2 and 121.1±3.6 mmHg, respectively, P>0.05). Orthostatic hypotension was observed in 3 patients and postural tachycardia syndrome (PTS) in one patient. We compared orthostatic hemodynamic changes in the studied cohort versus published data on orthostatic hemodynamic changes uncluding POT revealed in patients with severe brain damage examined before and after brain death.Conclusion. Orthostatic stability of blood circulation can be maintained for a short period of time in patients surviving after critical diffuse brain damage associated with chronic disorders of consciousness. Critical brain damage resulting in brain death associates with a significant reduction of all hemodynamic parameters and severe orthostatic hypotension with restoration of initial blood pressure values when the patient is returned to the horizontal position
Effects of an Innovative Head-Up Tilt Protocol on Blood Pressure and Arterial Stiffness Changes
No full textThe objective of our study was to identify blood pressure (BP) and pulse wave velocity (PWV) changes during orthostatic loading, using a new the head-up tilt test (HUTT), which incorporates the usage of a standardized hydrostatic column height. Methods: 40 healthy subjects 20–32 years performed HUTT, which was standardized to a height of the hydrostatic column at 133 cm. Exposure time was 10 min in each of 3 positions: horizontal supine 1, HUTT, and horizontal supine 2. The individual tilt up angle made it possible to set the standard value of the hydrostatic column. Hemodynamic parameters were recorded beat to beat using “Task Force Monitor 3040 i”, pulse-wave velocity (PWV) was measured with a sphygmograph–sphygmomanometer VaSera VS1500N. Results: Orthostatic loading caused a significant increase in heart rate (HR) and a decrease in stroke volume (SV) (p < 0.05) but no significant reductions in cardiac output, changes in total vascular resistance (TVR), or BP. An analysis of personalized data on systolic blood pressure (SBP) changes in tilt up position as compared to horizontal position (ΔSBP) revealed non-significant changes in this index in 48% of subjects (orthostatic normotension group), in 32% there was a significant decrease in it (orthostatic hypotension group) and in 20% there was a significant increase in it (orthostatic hypertension group). These orthostatic changes were not accompanied by any clinical symptoms and/or syncope. During HUTT, all subjects had in the PWV a significant increase of approximately 27% (p < 0.001). Conclusion: The new test protocol involving HUTT standardized to a height of hydrostatic column at 133 cm causes typical hemodynamics responses during orthostatic loading. Individual analysis of the subjects revealed subclinical orthostatic disorders (OSD) in up to 52% of the test persons. During HUTT, all test subjects showed a significant increase in PWV. The new innovative HUTT protocol can be applied in multi-center studies in healthy subjects to detect preclinical forms of orthostatic disorders under standard gravity load conditions
The use of high-strength cast iron with a ferritic structure for the reciprocating displacement system of the internal combustion engine pistons and the improvement of its operation parameters
No full textA study of compositions of samples of high‑strength cast iron, the use of which is possible in the development of an internal combustion engine with an improved design of a combined reciprocating conversion system, has been carried out. A number of research methods were carried out, including isothermal hardening. The optimal combination of strength and plastic properties have samples from high‑strength cast iron containing, wt.%: 2.9–3.1 C; 3.2–3.5 Si; 0.28–0.31 Mn; 0.7 Cu; 0.35 % Mo and 0.025B. Also, in the course of the study, the possibility was considered and studies were conducted on quenching cast iron in a spray chamber and jet cooling, as an alternative to traditional quenching in molten salts. The data obtained indicate that during jet‑air isothermal quenching, the structure of cast iron is completely and uniformly formed along the cross‑section, while providing a level of tensile strength up to 950 MPa, hardness up to 360–370 NV while maintaining elongation at tension up to 8 %. The use of such a class of cast iron in improved KSPVPP will both increase the life of the internal combustion engine as a whole, and improve its operational characteristics – reduce noise and reduce the weight of the structure
Bibliometric dimension of innovation communication productivity of Tata Institute of Social Sciences
No full textBibliometric analysis of 663 papers published by the social scientists of Tata Institute of Social Sciences during 1990-2000 in diverse domains: Criminology and Correctional Administration, Extra Mural Studies, Family and Child Welfare, Health Service Studies, Medical and Psychiatric Social work, Personnel Management and Industrial Relations, Research Methodology, Social Welfare Administration, and Urban and Rural Community Development, and Research Units: Social Work Education and Practice Cell, Audi-Visual Unit, Unit for Labour Studies, National Service Scheme, Publication Unit, Unit for Rural Studies, Unit for Research in the Sociology of Education, Students Service Cell, Unit for Child and Youth Research , Unit for Family Studies, Unit for Media and Communication, Unit for Research and Consultancy in Social Policy, Unit for Urban Studies, Unit for Social Policy and Social Welfare Administration, and Unit for Women Studies were analysed for authorship pattern, collaboration co-efficient 92.46 percent (613 papers) of papers were single authored followed by 6.33 percent (42 papers) two authored papers. Maximum collaboration coefficient (0.13) was found during 1996-1997. Most prolific authors were: Murli Desai, Sarthy Acharya, Lakshmi Lingam, I.U.B. Reddy, Kailash, Shalini Bharat, and Chhaya Datar. The core journals that publishes Tata Institute of Social Sciences scientists’ papers were: Indian Journal of Social Work (98), Economic and Political Weekly (26), Perspective of Social Work (7), and All India Institute of Local Self Government (5). Most prolific keywords were: Social Work (9), People-Centred development (8), Social work profession (8), Child labour (6), India (6), Sociology-South-Asia (6), and Non-Governmental Organisations (5)
Оценка прочностных характеристик полимерных материалов для изготовления элементов персонального электротранспорта
No full textThe properties of materials for airless wheel propulsion of vehicles, including electric ones, have been studied. The experimental substantiation of the choice of the type of polymer matrices and compositions of reinforcing fillers for the manufacture of an airless wheel mover of electric vehicles has been carried out. To test the basic epoxy matrix, part of the samples without the addition of reinforcing fibers was cured at room temperature (L-285H), and the rest (L-285G) – when heated to 60 °C. In order to improve the strength characteristics of the epoxy matrix L-285G, glass reinforcement was carried out with EC16 1600T-16(400) glass reinforcement. The Smooth-Cast 300 Series was chosen as the matrix for performing samples based on injection-molded polyurethanes. Samples are made of base polyurethane under various conditions: at atmospheric rejection (SC), under vacuum 0.8 kPa (SC-0.8) and during vibration-induced curing (SCV). Comparative tests were carried out, which showed differences in the mechanical properties of the base matrices based on epoxy resins and injection-molded polyurethanes, in particular, the relative elongation of samples from injection-molded polyurethane by more than 2 times. It is established that the most rational use of injection-molded polyurethane is application as damping elements, and the material for manufacturing spokes dampers is composite SCV-S-20. It is advisable to manufacture products from the resulting composite when vibrations are applied to the mold and with preliminary vacuuming at a vacuum of 0.8 kPa of the components of the polyurethane matrix, which reduces the number of internal defects in the form of shells. Since vacuuming of the product during polymerization does not give a significant effect due to the presence of a set of specialized deaeration additives in the base matrix, it is proposed to carry it out under constant control, since exceeding the vacuum in the range from 0.8 to 0.9 kPa entails decomposition of individual matrix components with foam formation.Изучены свойства материалов для безвоздушного колесного движителя транспортных средств, в том числе электрических. Выполнено экспериментальное обоснование выбора типа полимерных матриц и составов армирующих наполнителей для изготовления безвоздушного колесного движителя электротранспортных средств. Для проведения испытаний базовой эпоксидной матрицы часть образцов без добавления армирующих волокон отверждалась при комнатной температуре (L-285H), а остальные (L-285G) – при нагреве до 60 °С. В целях улучшения прочностных характеристик эпоксидной матрицы L-285G проводили армирование стеклоровингом ЕС16 1600Т-16(400). Матрицей для выполнения образцов на базе литьевых полиуретанов был выбран Smooth-Cast 300 Series. Из базового полиуретана изготовлены образцы при различных условиях: при атмосферном отвержении (SC), под вакуумом –81,1 кПа (SC-0.8) и при отверждении с наложением вибрации (SCV). Проведены сравнительные испытания, которые показали отличия механических свойств базовых матриц на базе эпоксидных смол и литьевых полиуретанов, в частности относительное удлинение образцов из литьевого полиуретана более чем в 2 раза. Установлено, что в качестве демпфирующих элементов наиболее рационально применение литьевого полиуретана, а материала изготовления спиц-демпферов – композита SCV-S-20. Изготовление изделий из полученного композита целесообразно проводить при наложении на форму вибраций и с предварительным вакуумированием при вакууме 81,1 кПа компонентов полиуретановой матрицы, что позволяет снизить количество внутренних дефектов в виде раковин. Вакуумирование изделия при полимеризации не дает значимого эффекта ввиду наличия в базовой матрице комплекта специализированных деаэрационных присадок, поэтому предложено проводить его при постоянном контроле, так как превышение вакуума в пределах от 81,1 до 91,2 кПа влечет разложение отдельных компонентов матрицы с образованием пены
