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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 341-360 от 853

Заглавие: Моделиране и реализация на сигма-делта модулатор от трети ред Автор: Ценов, Георги; Tsenov, Georgi; Терзиева, Снежана; Terzieva, Snejana; Якимов, Петър; Yakimov, Peter; Младенов, Валери; Mladenov, Valeri Дата: 2007 Резюме: Sigma-Delta (∑∆) modulation has become more and more popular alternative for robust and inexpensive analog-to-digital (A/D) conversion for the past years. As a result of this, the converters based on 1-bit ∑∆ modulators are widely used in different applications. In this paper we present an experimental electronic realization of a third order ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Разпространение на солитони в кабелни линии със загуби Автор: Червенкова, Тодорка; Chervenkova, Todorka Дата: 2007 Резюме: The propagation of solitary waves (solitons) in communication line is investigated. The solitons are generated in the non-linear dispersion transmission line. It is presented as non-linear circuit with distribution parameters, which include non-linear capacitors. The non-linear circuit consists of multiple sections, which included inductance, ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Многоканална измервателна система за електрическа импедансна томография Автор: Долапчиев, Ивайло; Dolapchiev, Ivaylo; Брандиски, Костадин; Brandisky, Kostadin Дата: 2007 Резюме: This paper presents a prototype of a 16-channel Electrical Impedance Tomography System (EITS). The main characteristics of the system include: continuous frequency selection from 1 kHz to 100 kHz, 16 independent current sources and 16 independent synchronous voltmeters. The governing software which calibrates the system components and ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Aлгоритъм за определяне на закъсненията в електрически вериги с логически схеми Автор: Филипова, Красимира; Filipova, Krasimira; Филипова-Петракиева, Симона; Filipova-Petrakieva, Simona Дата: 2007 Резюме: Dynamical analysis of electrical circuits, based on the logical schemes, takes into consideration the delays of the output signals with respect to the input signals of the each logic schemes in the electrical circuit considered. An algorithm for synchronization the signals in the analyzed electrical circuit, takes into account the delays ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Компенсация на влиянието на крайния коефициент на усилване на операционните усилватели върху характеристиките на елиптични верижни SC филтри Автор: Радев, Николай; Radev, Nikolay; Иванов, Кънчо; Ivanov, Kantcho; Станчев, Калин; Stanchev, Kalin Дата: 2007 Резюме: A combined approach for reducing the effects of operational amplifiers finite DC gain A in SC elliptic leapfrog ladder filters is presented. The effectiveness of the proposed approach is demonstrated by designing a fifth-order lowpass filter. The variation of the finite gain A from its nominal value A0 is taken into account. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Подход за обучение на студенти по обектно-ориентирано програмиране Автор: Maleshkov, Stoyan Bogdanov; Жечев, Димитър Павлов; Jetchev, Dimitar Pavlov; Малешков, Стоян Богданов; Maleshkov, Stoyan Bogdanov Дата: 2006 Резюме: Based on the experience gained in object-oriented programming (OOP) the paper proposes a practical approach for student’s training at a technical university. Studying the Java language the main attention is focused on understanding the general philosophy of OOP. This is achieved by building up a general package of classes for processing of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: An approach for determing the difficulty of test items for assessment the quality of knowledge mastering Автор: Jelev, Gospodin Jelev; Желев, Господин Желев; Minkovska, Daniela Veleva; Минковска, Даниела Велева; Minkova, Yoana Mihaylova; Минкова, Йоана Михайлова Дата: 2006 Резюме: The paper presents the results from research and analyses of computerized test control for students’ knowledge assessment. One of the basic test characteristic – it’s difficulty is examined and analyzed. The quality of used test items is verified and estimated through experimental data, obtained from researches on two groups of students in ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Защо най-трудно се създават инженери за вградени устройства Автор: Георгиев, Веселин Gueorguiev, Vesselin; Иванов, Иван Евгениев Ivanov, Ivan Evgeniev; Георгиева, Десислава Georgieva, Desislava Дата: 2006 Резюме: Programming for embedded devices and systems is modern and preferable, and there are work positions in many companies – so students and engineers are interested in it. After few months a great percent of them quit or hesitate to work in this area. As a result – we have a lot of programmers and control engineers but there is lack of people ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: A new approach to conducting educational tests in a web environment Автор: Videkov, Valentin Hristov; Djamiykov, Todor Stoyanov; Radonov, Rossen Ivanov Дата: 2006 Резюме: This paper treats a new approach to the conduction of educational tests in different subjects in a web environment. An environment for electronic management and its functions are presented. Up to now the educational tests in that kind of environment were carried out on computers with controlled IP addresses and in the presence of a lecturer. ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Architecture of knowledge artifact tool aiming to support collaborative knowledge creation Автор: Tchoumatchenko, Vassiliy Platonovitch; Scapolla, Anna Marina; Vasileva, Tania Krumova; Furnadhziev, Ivan; Poggi, A. Дата: 2006 Резюме: In recent years, semantic web based applications have been developed in numerous fields, including those of knowledge management and education/training. EU project KP-Lab is intended to productively utilize emerging technologies of the semantic web infrastructure. The paper considers the functional requirements and the architecture of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Web based software for semiconductor devices lab measurement system Автор: Furnadziev, Ivan Haralampiev; Tchoumatchenko, Vassiliy Platonovitch; Vasileva, Tania Krumova; Tenev, Dimitar Дата: 2006 Резюме: The advance of the technologies nowadays allows putting many laboratory measurement instruments in a single desktop box. This desktop box combined with a personal computer and Internet connection, gives a perfect opportunity for a laboratory which is accessible at any time and place. Many companies have created different measurement boxes ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Computer based measurement systems for semiconductor devices labs Автор: Tchoumatchenko, Vassiliy Platonovitch; Furnadziev, Ivan Haralampiev; Vasileva, Tania Krumova; Tenev, Dimitar Дата: 2006 Резюме: The paper describes the developed software architecture of computer based measurement system for semiconductor devices labs. The architecture is specifically targeted towards Web based Java applications, where the browser becomes the platform for a lightweight hypertext-based user interface. An overview of some data acquisition (DAQ) devices is performed. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Алгоритъм за анализ на схема на Чуа Автор: Манев, Стойчо; Георгиев, Владимир; Илиев, Илия рец.; Manev, Stoycho; Georgev, Vladimir; Ilieb, Iliya rev. Дата: 2006 Резюме: An algorithm for analysis of Chua’s circuit has been proposed. The effectiveness of the algorithm, used by the analysis of the circuit for a fixed set of values of the parameters of the differential equations, has been shown. Тhe Lyapunov’s exponents are find and some respective conclusions have been made. Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Експериментално и числено изследване на баластен дросел Автор: Михов, Михо Рачев; Mihov, Miho Rachev; Рац, Нели Симеонова; Rats, Neli Simeonova; Агапиев, Васил Минчев рец.; Agapiev, Vasil Mihchev reviewer Дата: 2006 Резюме: The present work represents experimental and numerical investigations of ballast choke for discharge lamps. Purpose of the investigation is to define the non-linear relationship between the choke inductance and the current flowing trough it. The investigated object is НВИ 250/220-Bulgarian and BSN 250 L300 – made in Poland. The numerical ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Влияние на скоростта върху изходния сигнал на електромагнитен преобразувател с отместени правоъгълни намотки Автор: Иванов, Валери С.; Ivanov, Valeri S.; Daskalov, Zhivko rev.; Даскалов, Живко; Гунински, Стефчо Георгиев; Guninski, Stefcho Georgiev Дата: 2006 Резюме: The influence of the relative velocity between transformer electromagnetic transducer with parallel displaced coils and conductive flat ferromagnetic object is presented in this paper. Three designs of transducer with rectangular coils are investigated. The plan diagrams at different displacements are given and the influence of the velocity ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Получаване на солитони в нелинейна предавателна линия Автор: Grigorov, Grigori; Григоров, Григори; Червенков, Атанас; Chervenkov, Atanas; Младенов, Валери Марков; Mladenov, Valeri Markov; Chervenkova, Todorka; Червенкова, Тодорка; Папазов, Сава; Papazov, Sava; Тошев, Георги рец.; Toshev, Georgi rev. Дата: 2006 Резюме: The generation of solitary waves (solitons) in communication line is investigated. Fundamental equations for describing of electromagnetic processes, which give the solitons solution are considered. The solitons solution of Korteweg de Vries equation is solved numerical. The comparison of finding solutions with numerical solution of circuit’s ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Нелинеен динамичен модел на индуктивни баласти Автор: Рац, Нели Симеонова; Rats, Neli Simeonova; Agapiev, Vasil rev.; Агапиев, Васил рец. Дата: 2006 Резюме: The modeling of the illumination devices with discharge lamps at dimming requires adequate model of the discharge lamps and of the inductive ballast. The nonlinear dynamical model in the present work is described in Matlab environment. The model represents the electromagnetic behavior of the ballast, as well as the electrical and the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Експериментално и симулационни изследване на натриева лампа с високо налягане с мощност 1000W Автор: Рац, Нели Симеонова; Rats, Neli Simeonova; Агапиев, Васил рец.; Agapiev, Vasil rev. Дата: 2006 Резюме: The purpose of the present study is to investigate and validate of the developed in analytical description and models of high pressure sodium lamps (HPSL). Experimental and simulation results of HPSL investigation of power 1000W “Ceramalux Alto” produced by PHILIPS, are covered in the present work. The analysis of the received results proves ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Изразяване на светлинния поток на НЛВН чрез електрическите й величини и параметри Автор: Рац, Нели Симеонова; Rats, Neli Simeonova; Agapiev, Vasil rev.; Агапиев, Васил рец. Дата: 2006 Резюме: Own experience results, targeting analytical and quantitative expression of the luminous flux of high pressure sodium lamps (HPSL) dependable on the HPSL electrical values; power, voltage, current, conductance, for nominal conditions and at dimming are generalized in the present paper. The analytical models are verified by experimental ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Nb-addition and cold deformation effects on corrosion resistance of type 304L austenitic stainless steel Автор: Shenawy, Eman; El-Shenawy, Eman; Tabakova, Bozhana; Табакова, Божана рец.; Шенауи, Еман; Ел-Шенауи, Еман Дата: 2005 Резюме: The effects of Nb addition and cold deformation (CD) on the electrochemical behavior of austenitic stainless steel were studied in 3.5% NaCl solution. Electrochemical impedance spectroscopy (EIS) measurements have been used to investigate the corrosion behavior after two weeks of the steel immersion in 3.5% NaCl solution. The occurrence ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 341-360 от 853

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