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Proceedings of the Technical university of Sofia, 1995 -
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Последно депозирани

Proceedings of the Technical university of Sofia, 1995 -: Последно депозирани

Показване на публикации 181-200 от 853

Заглавие: Компютърно симулиране на разпространението на високочестотни сигнали в силови кабели за средно напрежение Автор: Червенкова, Тодорка Вълева; Chervenkova, Todorka Valeva; Червенков, Атанас Георгиев; Chervenkov, Atanas Georgiev; Божков, Стоян Х.; Bozhkov, Stoyan H. Дата: 2009 Резюме: An advanced model of the power medium voltage cable for high frequency is created. Simulations of the cable model in frequency domain are made. The distributions of the impedance in frequency of the power cable by different length in border mode - opening circuit and short circuit are obtained. The change of the impedance in frequency domain ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Определяне на механичните загуби на синхронна машина по метода на самоспиране Автор: Михов, Михо Рачев; Mihov, Miho Rachev; Сотиров, Димитър Кирилов; Sotirov, Dimitar Kirilov; Баташки, Стоян; Batashki, Stojan Дата: 2009 Резюме: An implementation of selfstopping method for determining the mechanical losses of synchronous machine is presented. The survey is conducted in WEC "Krichim". With the obtained results for mechanical losses and reported data for the operating parameters of the machine in compensation regime are also defined steel losses. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Заместваща схема на синхронна машина и еквивалентност на основните формули Автор: Божилов, Ганчо Йорданов; Bojilov, Gantcho Yordanov Дата: 2009 Резюме: In this paper an equivalent circuit of a synchronous machine for adequate description of all processes and quantity by stationary function of the machine are proposed. He corresponds of the fundamental equations of the synchronous machines of all types (salient poles, smooth poles or with variable reluctance, generators, motors, compensators) ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Към определянето на ефективната стойност на тока на еднофазните колекторни двигатели с наситена магнитна система, Автор: Божилов, Ганчо Йорданов; Bojilov, Gantcho Yordanov; Иванов, Адриан Петров; Ivanov, Adrian Petrov Дата: 2009 Резюме: In the paper a method for determining of the R.M.S. value and the first three odd harmonics of the current of single-phase commutator motors with saturated magnetic system is presented which the shape is non-sinusoidal. For this purpose a approximation of the magnetic characteristic of the motor by two parametric exponential function is ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Моделни изследвания за определяне характеристиките н въглищни потоци от складовото стопанство на ТЕЦ „Марица Изток 3” Автор: Бонев, Бончо И.; Bonev, Boncho I. Дата: 2009 Резюме: The operations in the fuel depot of TPS “Maritza East 3” are directed towards equalizing of the characteristics of the coal receipted from the opencast mine. It is possible, the realization of two strategies in this relation – a strategy purposed total “equalizing” and a strategy purposed dividing of the coal into two quality categories and ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Определяне качеството на въглищата на изхода от рудник в енергийния комплекс „Марица Изток” Автор: Бонев, Бончо И.; Bonev, Boncho I. Дата: 2009 Резюме: The preliminary information about quality of the coal entering in the fuel depot is of exceptional importance for the operation of the thermal power plant. Between mine “Troyanovo 3” and TPS “Maritza East 3”, it exist direct belt transport connection. In that case, it means, it is necessary the coal characteristics on the outlet of mine to ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Методи за научни визуализации – част 2 Автор: Георгиев, Веселин; Gueorguiev, Vesselin; Георгиева, Десислава В.; Georgieva, Desislava V. Дата: 2009 Резюме: In the last two decades, growth in volume and quantity of information is so great that new methods are needed for processing and extracting information from these 'raw' data. One of the most promising directions is the computer visualization. This survey aims to present the basic methods for the visualization of scientific information - is ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Методи за научни визуализации – част 1 Автор: Георгиев, Веселин; Gueorguiev, Vesselin; Георгиева, Десислава В.; Georgieva, Desislava V. Дата: 2009 Резюме: In the last two decades, growth in volume and quantity of information is so great that new methods are needed for processing and extracting information from these 'raw' data. One of the most promising directions is the computer visualization. This survey aims to present the basic methods for the visualization of scientific information - is ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Относно едно диференциално уравнение от дробен ред с непостоянни коефициенти Автор: Николова, Янка Великова; Nikolova, Yanka Velikova Дата: 2009 Резюме: This paper refers to the solution of a two-terms fractional differential equation with nonconstant coefficients. A transform method is applied and a generalized Laplace-type integral transform is used. The explicit solution obtained agrees with previously established result by T. Nonnenmacher related to a special class of normalized one-sided ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Измерване и моделиране на статорната индуктивност на превключваем реактивен двигател 12-8 с помощта на изкуствени невронни Автор: Динчев, Димитър; Dinchev, Dimitar; Velinov, Valeri; Галинов, Иво; Galinov, Ivo; Горбунов, Ясен Владимиров; Gorbounov, Yassen Vladimirov; Павлитов, Константин Недялков; Pavlitov, Konstantin Nedyalkov Дата: 2009 Резюме: The growing popularity of the Switched Reluctance Motors (SRM) during the last years is due to the extensive development of the power electronics and the vast opportunities of computer control and simulation systems application. In this article an innovative method has been suggested. It is used for a nonlinear identification of the stator ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Използване на клъстерен анализ за определяне влиянието на основни параметри на лазерите с пари на меден бромид върху коефициента им на полезно действие Автор: Денев, Николай; Denev, Nikolay Дата: 2009 Резюме: A copper bromide vapor laser of wavelengths 510.6 nm and 578.2 nm is the object of this research. The aim of the work is the investigation of relative influence of the basic laser parameters just like input power, geometric dimensions, hydrogen gas pressure etc. on laser efficiency. A big quantity of experimental data is used from the Metal ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Отражение на обектива на термовизионната камера при наблюдение на близки обектив Автор: Видеков, Валентин Христов; Videkov, Valentin Hristov; Андонова, Анна Владова; Andonova, Anna Vladova Дата: 2009 Резюме: This paper presents the results from the investigation related to the influence of the close position of a thermo vision camera when studying micro objects. This kind of camera is used to determine the temperature distribution of objects in operation mode. The results from the impact of the camera lens on the pads with high coefficient of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Вариант на твърдотелно анизотропно контактуване Автор: Видеков, Валентин Христов; Videkov, Valentin Hristov; Цанева, Боряна Рангелова; Tzaneva, Boryana Rangelova; Бояджиев, Стефан Иванов; Boyadjiev, Stefan Ivanov; Ячовски, Александър; Yachoski, Alexander Дата: 2009 Резюме: This paper presents an alternative method for contacting and connection between electronic components. An anisotropic conducting plate is suggested to be used Instead of the well-know anisotropic adhesives. The construction of such a plate and its basic parameters are presented. A technological version for preparation based on nanopore anode ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: E-learning with MOODLE in the energetics and electronics college Автор: Spasova, Nadezhda; Спасова, Надежда Дата: 2008 Резюме: The aim of the current research is to share experience of the choice and introduction of an e-learning system in the Energetic and Electronics College, as well as considering features of the education - all curriculums are organized to have close relation between theory and practice. A choice of LMS is been made – platform Moodle. Moodle ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Applications of hardware description languages for frequency domain modeling and analysis of analog circuits Автор: Panayotov, Ivan Jelev; Панайотов, Иван Желев Дата: 2008 Резюме: In this paper the way of using universal Analog and Mixed Signal (AMS) Hardware Description Languages (HDLs) to model and simulate frequency dependant elements such as filters is discussed. Analog description languages such as VHDL-AMS and Verilog-AMS gain popularity as instruments for mixed signals modeling and simulations. They make it ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Development and analysis of a signal transfer circuit with hydrogen bonding Автор: Rusev, Rostislav Pavlov; Русев, Ростислав Павлов; Angelov, George; Ангелов, Георги; Atanasov, Boris; Атанасов, Борис; Takov, Tihomir Borisov; Таков, Тихомир Борисов; Hristov, Marin Hristov; Христов, Марин Христов Дата: 2008 Резюме: A microelectronic circuit based on hydrogen bonds is developed and analyzed. The simulations in Matlab demonstrate that the biocircuit object emulates the functionality of conventional electrical circuits. The static analysis shows the circuit is akin to current source while the dynamic analysis demonstrates that the circuit successfully ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Microelectronic networks analogous to protein hydrogen bonded networks made from backbone peptides and water molecules Автор: Rusev, Rostislav Pavlov; Русев, Ростислав Павлов; Atanasov, Boris; Атанасов, Борис; Takov, Tihomir Borisov; Таков, Тихомир Борисов; Hristov, Marin Hristov; Христов, Марин Христов Дата: 2008 Резюме: For microelectronic purposes, signal transfer (proton transfer) in a hydrogen bonding network is studied. The network is extracted from β-lactamase and it includes atoms from protein backbone and water molecules. The model of proton transfer in hydrogen bonds is developed on the basis of Marcus theory and the protein electrostatic theory. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Possibilities of improvement of monitoring and diagnostic process of power electronic devices Автор: Veselinov, Vladislav Danchev; Веселинов, Владислав Данчев Дата: 2008 Резюме: In the present article are analyzed the possible break-down situations in the internal electric circuits of power rectifier convertors. The main task is a theoretical report of the developing processes during the occurance of internal short circuits under a failure of one or several valves and their influence upon the rest of them. The ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Inductors influence over the DC-DC converter performance Автор: Brusev, Tihomir Sashev; Брусев, Тихомир Сашев; Goranov, Peter Trifonov; Горанов, Петър Трифонов Дата: 2008 Резюме: This paper concerns the technological limitation of fully monolithic dcdc converters. Two types of circuits were investigated on AMS CMOS 0.35 µm process. Comparison between efficiency results of architectures used on-chip and offchip filter’s inductors are made. The inductors influence over the dc-dc converters performance is evaluated. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Interface characterization of PPV – derivative based structures by direct current electrical measurements Автор: Aleksandrova, Mariya; Александрова, Мария; Dobrikov, Georgi Hristov; Добриков, Георги Христов; Jivkov, Ivaylo; Живков, Ивайло; Dimov, Deyan; Димов, Деян; Rassovska, Milka Markova; Ръсовска, Милка Малкова Дата: 2008 Резюме: Polyphenylenevinylene derivative (PPV – D) based structures with Ohmic and Schottky electrodes have been produced and investigated by direct current– voltage (I-V) measurements. Polymer solutions with different solvent concentrations are prepared and dependence of the film thickness on the amount of solvent is established. It was found that ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 181-200 от 853

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