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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 281-300 от 853

Заглавие: Behavior modeling of DC/DC buck converter Автор: Panayotov, Ivan; Панайотов, Иван; Brusev, Tihomir Sashev; Брусев, Тихомир Сашев; Hristov, Marin Hristov; Христов, Марин Христов; Philipov, Philip Philipov; Филипов, Филип Филипов Дата: 2007 Резюме: In this paper the implementation of analog extensions of Hardware Description Languages for behavior modeling and simulations of DC/DC converters is described. The design sequence from high level model to block level is examined. The system like description and top-down methodology are considered for behavior verification. The DC/DC converter ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Behavior modeling of elements of the structure of analog array Автор: Panayotov, Ivan; Панайотов, Иван; Manolov, Emil Dimitrov; Манолов, Емил Димитров; Philipov, Philip Philipov; Филипов, Филип Филипов Дата: 2007 Резюме: In this paper the way of creating universal AMS (Aanlog and Mixed Signals) HDL (Hardware Description Language) models for the elements of the structure of Field Programmable Analog Array (FPAA) chips is discussed. These are programmable chips that perform analog functions and are similar to digital FPGA (Field Programmable Gate Array) chips. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: The little transistor and the CCAS revolution Автор: Athanassov, Alexander Il.; Атанасов, Александър Ил. Дата: 2007 Резюме: A scientific trip trough the years - from the birth of the first transistor to the contemporary Computers, Communications and Automation Systems (CCAS). How did the first transistor start the worldwide technology revolution – the microprocessor power, RAM, Global Net and changed the world as a whole. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Tachometer – cyclometer with programmable logic Автор: Donkov, Yavor Danchev; Донков, Явор Данчев; Djamiykov, Todor Stoyanov; Джамийков, Тодор Стоянов; Rusev, Atanas Georgiev; Русев, Атанас Георгиев Дата: 2007 Резюме: This paper presents the technical decision of tachometer which is realized with program logic. A distinguish feature of the suggestion is the using functional transformation of the number next impulses in order to reach a result in rpm. This way there is no need oft mathematical operations multiplication and division. The device is programmed ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Optic sensor for the joint of a walking robot Автор: Djamiykov, Todor Stoyanov; Джамийков, Тодор Стоянов; Milushev, Mladen Stoilov; Милушев, Младен Стоилов; Marinov, Marin; Маринов, Марин Дата: 2007 Резюме: This paper illustrates the process of study and choice regarding a sensor for motioning of walking robots. Typical for all walking machines is the need of a effective force-to-weight ratio. Based on preset parameters a sensor prototype for a sixlegged mobile robot joint had been chosen. To meet the requirements all possibilities for reaching ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Investigation of electronic instruments and methods for web-based energy management system development Автор: Yakimov, Peter Ivanov; Якимов, Петър Иванов; Ovcharov, Stefan Yordanov; Овчаров, Стефан Йорданов; Tuliev, Nikolay Todorov; Тюлиев, Николай Тодоров; Balkanska, Emiliya Georgieva; Балканска, Емилия Георгиева Дата: 2007 Резюме: Energy management systems exchange enormous amounts of information requiring quick access and data security. The communication and integration of data from various control centers, power plants, and substations, have become necessary. SCADA (Supervisory Control and Data Acquisition) systems are essential parts of the energy management systems ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Automated system for investigation of resistance temperature dependence of high temperature superconductors Автор: Mitev, Mityo Georgiev; Митев, Митьо Георгиев; Nazarova, Elena; Назърова, Елена; Dimitrov, Emil Nikolov; Димитров, Емил Николов; Zahariev, Anton; Захариев, Антон; Georgiev, Jordan; Георгиев, Йордан Дата: 2007 Резюме: The requirements to an automated system for the temperature dependence investigation of resistance in high temperature superconductors (HTSC) were analyzed. The experimental problems within a real sample are shown. The constructed system and the calibration experiments with a superconducting sample of YBa2Cu3O7-δ were described. The achieved ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Computer controlled setup for precise electrical measurements – a step towards the virtual instrumentation Автор: Jivkov, Ivaylo Cankov; Живков, Ивайло; Alexandrova, Maria Petrova; Александрова, Мария Петрова; Dimov, Deyan; Димов, Деян; Kalinova, Radostina; Калинова, Радостина; Nikolova, Vessela; Николова, Весела; Denishev, Vladimir; Денишев, Владимир Дата: 2007 Резюме: Virtual instrument for low current and low noise DC electrical measurement based on Keithley 617 electrometer is developed. The software consists of two parts operating in parallel threads – GUI accepting the commands from the operator and a cycle for the data acquisition and control. The device is tested by measurement of resistor with ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Hazardous gas monitoring using vi server Автор: Nikolov, Georgi; Николов, Георги; Nikolova, Boyanka Marinova; Николова, Боянка Маринова; Marinov, Marin; Маринов, Марин Дата: 2007 Резюме: Today there is a great deal of interest in the development of gas monitoring systems for application of gas leaks, detection of harmful gases in mines, home safety, exhaust gas monitoring etc. In all this fields of investigation, a key matter is the need of flexible and practical virtual instruments, a way to easily expose the gas sensors ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Spice modeling of taguchi sensors Автор: Nikolova, Boyanka Marinova; Николова, Боянка Маринова; Nikolov, Georgi; Николов, Георги Дата: 2007 Резюме: The detection and monitoring of gases with metal oxide type sensors is become a well-established practice. Modern signal processing systems are usually composed of a variety of components, electrical as well as nonelectrical (e.g. sensors and actuators, fibre optics). More complex technical systems and higher levels of integration of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: The power quality and the measurement of harmonics Автор: Stanchev, Angel; Станчев, Ангел; Ovcharov, Stefan Jordanov; Овчаров, Стефан Йорданов Дата: 2007 Резюме: This paper has a purpose to explain the concept of harmonics at Low Voltage Supply Systems, which are part of the Power Quality Measurements. The work describes the main sources of the harmonic voltages and currents, the effects of harmonics, and the objectives of power quality measurement. In this work are given also the values of individual ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Dosimetric control system for a nuclear electronics training laboratory Автор: Mitev, Mityo Georgiev; Митев, Митьо Георгиев; Dimitrov, Еmil; Димитров, Емил Дата: 2007 Резюме: Analyzing the specific nature of working with radioactive sources in the Nuclear Electronics training laboratory we have formulated the precise requirements for the Dosimetric equipment. It has been proven that the stipulated requirements could be met by a dosimeter, functioning by the spectrum weight function method, using a NaI(Tl) ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: A simple method for stabilization of arbitrary spectra Автор: Tsankov, Ludmil Todorov; Цанков, Людмил Тодоров; Mitev, Mityo Georgiev; Митев, Митьо Георгиев Дата: 2007 Резюме: A method is proposed for stabilization of spectral data with arbitrary form. The method is based on the hypothesis that the successive measurements of a spectrum represent the same statistical distribution but in different X-scales. The transformation between X-scales is found by calculation of the moments of the distributions. It can be ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: GPRS system for monitoring of break - down and transient processes at current source parallel inverters Автор: Veselinov, Vladislav Danchev; Веселинов, Владислав Данчев Дата: 2007 Резюме: This article is dedicated to the realization of a GPRS system for monitoring of break-down and transient processes of a converter for induction heating. A structural scheme and an algorithm of work are represented and the influence of the system for control upon the security of work of the power electric device is summarized. The main ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Improving the parameters of an inductional surface hardening for one frequency and different specific powers per cm2 Автор: Karamanski, Pany A.; Карамански, Пани А.; Hristov, Tsvetozar; Христов, Цветозар Дата: 2007 Резюме: One of the main purposes of this article is to make a comparison among inductional heating for one working frequency of 30 kHz and different specific powers per cm 2 . Another task is to make a volume analyze of the surface and the whole volume of the hardened object and at the same time to define the quality of the hardening and the one ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Special operation features of the output transformer of series active power filters Автор: Gurgulitsov, Vanjo Tomov; Гургулицов, Ваньо Томов; Antchev, Mihail Hristov; Анчев, Михаил Христов; Petkova, Mariya; Петкова, Мария Дата: 2007 Резюме: This paper examines several special operation features of the output transformer included in the schematic of a series active power filter. Results enabling to found an output data to design the transformer are included. Also, graphics from a computer simulation and ocsilograms from experimental study of a laboratory model are presented. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Influence of input inductance over dynamic characteristics of single-phase shunt active power filter Автор: Petkova, Mariya; Петкова, Мария; Antchev, Mihail Hristov; Анчев, Михаил Христов Дата: 2007 Резюме: This paper presents the influence of input inductance over dynamic characteristics of a single-phase active power filter. Mathematical description is made and relationship among filter inductance, response time and other parameters of the system load – active power filter is derived. 3D graphics built using found formulas, simulation and ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Electrical design of three-phase bridge diode rectifiers with active-capacitive load by matlab Автор: Popov, Evgeniy; Попов, Евгений; Pindeva, Liliya; Пиндева, Лилия Дата: 2007 Резюме: Three-phase bridge diode rectifiers with active-capacitive load can be applied for energy conversion in simple wind power generators or in controlled a.c. electrical drives with squirrel-cage induction motors. They pose specific problems to the engineers. The known methods (the ”eastern”, based on the assumption that the voltage across the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Embedded system for video and signal processing Автор: Михов, Слави Георгиев; Dimitrov, Dimitar; Димитров, Димитър; Stoyanov, Krasimir; Стоянов, Красимир; Doychev, Doycho Dimitrov; Дойчев, Дойчо Димитров Дата: 2007 Резюме: Embedded microprocessor systems are becoming more and more widespread in techniques and machinery. In this paper, is made a description of a custom built system based on Analog Devices Blackfin processor family (ADSP-BF531/2/3). The system operates under Linux, which gives it flexibility and universality as an embedded solution for several ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Automatic analysis and visualization of multilead long-term ecg recordings Автор: Krasteva, Vessela Tzvetanova; Кръстева, Весела Цветанова; Iliev, Ivo Tzvetanov; Илиев, Иво Цветанов Дата: 2007 Резюме: Long-term ECG data collected during physical exercises (stress tests) and ordinary daily activity (holter recordings) are necessary for extended diagnosis of ischemia and transient cardiac arrhythmias. Owing to the computer-assisted systems, the cardiologist decision is considerably facilitated by fast methods for automated ECG analysis. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 281-300 от 853

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