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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 261-280 от 853

Заглавие: Софтуер за трансформация към главни оси с MAPLE Автор: Пеева, Кети Георгиева; Peeva, Ketty Georgieva; Андреев, Любомир; Andreev, Ljubomir Дата: 2008 Резюме: We develop software in MAPLE environment for transformation of the general form equation of second order curve (conic) or second order surface (quadric) to its normal form. Following analytical methods and using some of the MAPLE functions, we propose original code for computing the normal form equation of a conic or quadric, for plotting ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изследване на характеристиките на набор сигнали с показателите на Ляпунов Автор: Манев, Стойчо Велизаров; Manev, Stoitscho Velizarov Дата: 2008 Резюме: Study of different types of signals has been made. Signals, generated by means of appropriate algorithms have been tested. Hystograms and graphs are presented. The obtained results have been discussed. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изследване на клас сигнали с помощта на модифициран алгоритъм Автор: Манев, Стойчо Велизаров; Manev, Stoitscho Velizarov Дата: 2008 Резюме: Study of different types of signals has been made . For achieving this aim an appropriate modified algorithm, designed for obtaining the Lyapunov’s exponents, has been used. Hystograms and graphs are presented. The obtained results have been discussed. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Сравнителен анализ на алгоритми за изследване на клас сигнали Автор: Манев, Стойчо Велизаров; Manev, Stoitscho Velizarov Дата: 2008 Резюме: A comparative study of algorithms, designed for analysis of class of signals has been made. On this base an appropriate algorithm has been chosen. The effectiveness of the algorithm, by the processing of determined signals, has been shown. Тhe Lyapunov’s exponents are find and some respective conclusions have been made. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Multiple-model wiener filter for load disturbance rejection in hydro generator local network operation Автор: Puleva, Teofana Todorova; Пулева, Теофана Тодорова Дата: 2008 Резюме: The problem of random load disturbance rejection for hydro generator operating in local network is formulated as an optimal controller design problem in sense of minimum mean-square error - Wiener filter design. A multiple model adaptive control approach is explored. The control signal is formed as a weighted sum of particular control ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Опростен алгоритъм за числено интегриране чрез еднокорпусен микроконролер ot фамилията PIC12XX Автор: Милетиев, Росен Георгиев; Miletiev, Rossen Georgiev; Бекярски, Александър Богданов; Bekiarski, Aleksandyr Bogdanov; Бойчев, Димитър; Bojchev, Dimitar Дата: 2008 Резюме: The algorithm’s realization for numerical integration using a microcontroller of the family PIC12XX is related to some technical difficulties like the small computing resource of the microcontroller and the lake of an arithmetical multiplying unit. These problems require the adaptation of the known classical algorithms in order to achieve ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Natural radioactivity in the soils of bansko-razlog region Автор: Kobilarov, Roumen Georgiev; Кобиларов, Румен Георгиев Дата: 2008 Резюме: The natural gamma radiation and 137Cs deposit in the soils of Bansko-Razlog region was measured, using high-resolution gamma ray spectroscopy. The resulting annual effective dose was estimated to be 0,32 mSv, that is very lower than the level of 1 mSv adopted as the upper annual dose limit for the population in Bulgaria. The study area is ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: RIGHT-LUD wide bandpass SC ladder filter with compensation for finite amplifier gain and offset voltage Автор: Radev, Nikolay Asenov; Радев, Николай Асенов; Ivanov, Kantcho Panayotov; Иванов, Кънчо Панайотов Дата: 2008 Резюме: A gain- and offset- compensated (GOC) modification of sixth-order right-LUD wide bandpass switched-capacitor (SC) ladder filter is presented. At first, the conventional integrators in the filter are replaced with GOC SC integrators and the unswitched capacitors are split into two capacitors. Subsequently, the nominal op amps gain value A0 ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Понижаващ преобразувател на постоянно напрежение управляван в режим на хлъзгане с широчинно импулсна модулация Автор: Табахнев, Иван Нанев; Tabahnev, Ivan Nanev; Трушев, Иван Митков; Trushev, Ivan Mitkov; Владов, Симеон Стоянов; Vladov, Simeon Stoyanov Дата: 2008 Резюме: Based on the sliding mode control (SMC) principle [1], [2], [3], a controller of a pulse-width modulated (PWM) buck DC/DC converter is considered [4]. Modeling and simulations of the behavior of the system is very important before the on chip realization. The converter has been simulated in SIMULINK, and its dynamic performances have been ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Atmospheric moisture monitoring using labview Автор: Nikolov, Georgi; Николов, Георги; Nikolova, Boyanka Marinova; Николова, Боянка Маринова Дата: 2007 Резюме: This paper is dedicated to design and implementation of a virtual system for atmospheric moisture parameters measurement, monitoring and logging. The main purpose is to demonstrate new developments made with a multifunction data acquisition (DAQ) system, integrated sensors, graphical programming environment and new generation of DAQmx ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Micropumps for medical applications Автор: Denishev, Krassimir Hristov; Денишев, Красимир Христов; Trencheva, Boryana; Тренчева, Боряна Дата: 2007 Резюме: Much effort is being applied to the development of autonomous Micro Electro Mechanical Systems (MEMS). In their full and total configuration, Microsystems consist of sensor part, data processing part and actuator part. One kind of actuator devices, these are Microfluidic Pumps. Nowadays, they find very large applications in different areas ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Accelerometer design Автор: Denishev, Krassimir Hristov; Денишев, Красимир Христов; Petrova, Mihaela; Петрова, Михаела Дата: 2007 Резюме: Much effort is being applied to the development of intelligent, autonomous Micro Electro Mechanical Systems (MEMS). One kind of such devices, these are Accelerometers. Nowadays, they find very large applications in different areas of life, science and techniques. Contemporary microelectronics and microelectronic technologies give the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Microstructure and optical properties of ito thin films investigated for heat mirrors in solar collectors Автор: Dobrikov, Georgy Hristov; Добриков, Георги Христов; Rassovska, Milka Markova; Расовска, Милка Маркова; Boiadjiev, Stefan Ivanov; Бояджиев, Стефан Иванов; Gesheva, Kostadinka A..; Гешева, Костадинка А.; Sharlandjiev, Peter Stoyanov; Шарланджиев, Петър Стоянов; Koserkova, Albena; Косеркова, Албена Дата: 2007 Резюме: The aim of this work is preparation of RF sputtered ITO thin films for application as heat mirrors in solar thermal collectors. The alteration of optical properties and behavior in IR spectra of additionally treated films was investigated. The films were deposited on silicon and glass substrates by RF sputtering on vacuum installation A-400 ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: “Tailored” conductivity of segmented polydiphenylacetylene thin films for microelectronc application Автор: Jivkov, Ivaylo Cankov; Живков, Ивайло; Alexandrova, Maria Petrova; Александрова, Мария Петрова; Kalinova, Radostina; Калинова, Радостина; Jossifov, Christo Petkov; Йосифов, Христо Петков; Runenkina, Elena Sotirova; Руненкина, Елена Сотирова; Dobrikov, Georgi Hristov; Добриков, Георги Христов; Rassovska, Milka Markova; Расовска, Милка Маркова Дата: 2007 Резюме: New types of segmented polymers based on polydiphenylacetylene (PDPA) were synthesized and characterized. Measurement of current-voltage (I-V) characteristics of a representative samples show that bulk charge carrier injection dominate the conductive process rather than contact limited transport. Comparing the I-V characteristics measured ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: WO 3 thin films deposition on quartz crystal resonators for applications in gas sensors Автор: Boyadjiev, Stefan Ivanov; Бояджиев, Стефан Иванов; Rassovska, Milka Markova; Расовска, Милка Маркова Дата: 2007 Резюме: The present research is focused on the preparation and properties of sputtered transition metal oxides thin films. WO3 films of various thickness were deposited on quartz resonators in order to use the quartz crystal microbalance method for studying heir gas sensing properties. The influence of oxygen partial pressure and substrate temperature ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Nano semiconductor devices, including molecular semiconductors Автор: Rusev, Rostislav Pavlov; Русев, Ростислав Павлов; Atanasov, Boris; Атанасов, Борис; Takov, Tihomir Borisov; Таков, Тихомир Борисов; Hristov, Marin Hristov; Христов, Марин Христов Дата: 2007 Резюме: New types of semiconductors for microelectronics needs are proposed. In the first part of the article single electron transistors, their physical characteristics, constructive features and problems related to its V-PADOX technology construction are described. In the second part colloidal semiconductors in photo-conversion devices are ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Design and production of precise thick film circuits using photolithographic technology Автор: Partinova, Simona Peneva; Партинова, Симона Пенева; Takov, Tihomir Borisov; Таков, Тихомир Борисов Дата: 2007 Резюме: Fodel® Photoprintable Thick Film Pastes made by DuPont guarantee that printed circuits made by using these pastes benefit from both the recognized reliability of ceramic materials and the higher image density that is common for the thin film circuits by increasing the density in the X-Y plane by 400-500% compared to the conventional screen ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: The influence of fabrication steps on selected properties of power dmos transistor Автор: Ivanova, Malinka Spasova; Иванова, Малинка Спасова; Donoval, Daniel; Доновал, Даниел; Marek, Juraj; Марек, Журай; Vrbicky, Andrej Дата: 2007 Резюме: The high-voltage power DMOS transistors are widely used for various power electronic applications as motor controls and power switching supplies. Research and optimization of their characteristics is one of the challenges of power MOS transistor design. The Technology CAD (TCAD) tools support process and device simulation and help to predict ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Modified compact model of mosfet working under ESD stress Автор: Andonova, Anna Vladova; Андонова, Анна Владова; Gadjeva, Elisaveta Dimitrova; Гаджева, Елисавета Димитрова; Draganska, Polya Georgieva; Драганска, Поля Георгиева; Pavlov, Galin; Павлов, Галин; Marinov, Ivan Yotov; Маринов, Иван Йотов Дата: 2007 Резюме: A modified compact model to simulate the high current characteristics of a MOSFET working under ESD stress is developed. The model realized with current source is used to demonstrate the better accuracy of simulated I-V characteristics for the snapback region. The variation of the simulated output I-V characteristics from gate voltage values ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Investigation of the thermal interaction between an isothermal cylinder and its isothermal enclosure of an electric junction Автор: Kafadarova, Nadezhda Miteva; Кафадарова, Надежда Митева; Andonova, Anna Vladova; Андонова, Анна Владова; Georgiev, Georgi; Георгиев, Георги Дата: 2007 Резюме: This article deals with numerical simulation of air flow and heat transfer in an electric junction box comprising conductive metal wire rods each having a cylinder shape in cross section. Results obtained by a commercial CFD package widely used for electronic system temperature predictions. The paper gives considerable insight into the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 261-280 от 853

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