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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 321-340 от 853

Заглавие: Трифазни математически модели на агрегати за собствени нужди в електрическите централи с различни специфични особености Автор: Крумов, Андрей; Krumov, Andrej Дата: 2007 Резюме: The three-phase models are realized with momentary values of the electric quantities. This enables study of all types of slow and fast transients – starting of aggregates, operation at change of the load, supply voltage or its frequency, incomplete phase regimes, short circuits, etc. In the electric power stations, the driving of mechanisms ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Трифазен математически модел за изследване на режимите на работа на системите за собствени нужди в електрическите централи Автор: Крумов, Андрей; Krumov, Andrej Дата: 2007 Резюме: The auxiliary systems are built with single sectioned busbar system. For reducing the short-circuit currents transformers with separate windings are used. The loads are distributed almost uniformly between the main sections. This enables the model study of the regimes of auxiliaries to be limited to one section. The three-phase model of a ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Подходи за определяне на индуктивността на намагнитващия контур на асинхронен двигател Автор: Михов, Михо; Mihov, Miho; Рац, Емил; Ratz, Emil; Рачев, Емил; Rachev, Emil; Рац, Роберт; Ratz, Robert Дата: 2007 Резюме: The report covers comparison between the capabilities of three approaches for determination of the magnetizing mutual inductance in the asynchronous motor;Experimental approach by means of the idling and locked rotor experiments results,Numerical approach using the final elements analysis method in the FEMM program environment, Static ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Относно отчитането на насищането на магнитната среда при безсензорно векторно управление на асинхронни двигатели Автор: Рац, Емил; Ratz, Emil; Михов, Михо; Mihov, Miho; Рац, Роберт; Ratz, Robert; Рачев, Емил; Rachev, Emil Дата: 2007 Резюме: The paper is focused on the expression of the mutual inductance, L f m mr ( ) N  I , L f m ms ( ) N  I , L f m m ( ) N  I in order to take into account the squirrel cage asynchronous motor magnetic core saturation. The conducted analytical, experimental and simulation investigations in Matlab and FEMM environments show that adequate ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Числен подход за построяване на P-Q диаграми на явнополюсни синхронни генератори Автор: Михов, Михо; Mihov, Miho; Сотиров, Димитър; Sotirov, Dimitar; Ризов, Пламен; Rizov, Plamen; Господинов, Васил; Gospodinov, Vasil; Баташки, Стоян; Batashki, Stoyan Дата: 2007 Резюме: The numerical approach is offered for construction P-Q diagrams of hydrogenerators with different limits. The needed incoming data is usually provided by the producer of the machines. At the calculations it is supposed sanely that the iron cores are low saturated and the coefficient in saturation on d and q axes is practically the same. The ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Сравнителен анализ на характеристики в установен режим при честотно и векторно управление на асинхронен двигател Автор: Рац, Емил; Ratz, Emil; Рачев, Емил; Rachev, Emil Дата: 2007 Резюме: In this paper a comparative analysis of scalar and vector control method of induction motor is presented. Some steady-state characteristics are considered: the overloading ability is compared in both scalar control and rotor flux oriented vector control technique taking to account not to exceed motor’s rated current and voltage. Various ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Влияние на организирано подавания въздух, върху процесите в пещната камера на котел № 10 в ТЕЦ “Марица Изток 2” Автор: Игнатов, Борислав; Ignatov, Borislav; Бонев, Бончо; Bonev, Boncho; Тотев, Тотьо; Totev, Totyo Дата: 2007 Резюме: Some of the factors that have big influence on the burning processes are the quantity of the oxidant and the place where it is fed. In the present article are made investigations of the behavior of the torch in the burning chamber of boilers type P-62 №10 by different amounts of air in the basic burner, using the simulation modeling. The ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Влияние на експлоатационните характеристики на прахоприготвящите системи, върху процесите в пещната камера на котел №10 в ТЕЦ “Марица Изток 2” Автор: Игнатов, Борислав; Ignatov, Borislav; Тотев, Тотьо; Totev, Totyo; Бонев, Бончо; Bonev, Boncho Дата: 2007 Резюме: The characteristics of the coal-dust preparation systems and the mills productivity render a big influence over the process in the steam generators. The aim of that investigation is to value their influence and to determinate their effect on the burning process. It is possible to influence with them direct over the burning process in the ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Сегментиране на ръкописни думи с комбиниране на самоорганизиращи се невронни мрежи и евристични правила Автор: Драганов, Иво; Draganov, Ivo; Попова, Антоанета; Popova, Antoaneta Дата: 2007 Резюме: In this paper we present a new algorithm for handwritten word segmentation from images based on a combined method using self-organizing neural networks and heuristic rules. The suggested algorithm aims the usage of minimal number of segmentation points with as little heuristic rules as possible but preserving good accuracy for the segmentation ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Приложение на wavelet трансформацията за декомпозиция на дискретни аудио сигнали Автор: Момчеджиков, Михаил; Momtchedjikov, Mihail; Буджашки, Менде; Bujashki, Mende; Миронов, Румен; Mironov, Rumen Дата: 2007 Резюме: The Wavelet Transform (WT) is a transformation that can be used to analyze and represent the temporal and spectral properties of non-stationary signals like audio. The combination of time and frequency localization is important for coding audio signals. The WT yields a compact representation of signals without an a priori knowledge of signal ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Техники за 3D визуализация на терапевтично ниско-честотно магнитно поле Автор: Димитрова, Виргиния; Dimitrova, Virginiya Дата: 2007 Резюме: The article presents algorithms and techniques for 3d visualization of low-frequency magnetic field, generated by a pair of cylindrical coils placed on the surface of human body parts. Two different approaches for visualization of the field distribution are discussed for the cases of: coils with co-planar Z-axis and coils with arbitrary ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Тенденции в развитието на ICT-бранша и потенциалната реализуемост на бъдещите млади специалисти Автор: Георгиев, Веселин; Gueorguiev, Vesselin; Иванов, Иван; Ivanov, Ivan; Георгиева, Десислава; Georgieva, Desislava Дата: 2007 Резюме: The last 10-15 years of Bulgarian higher education changed lecturers’ point of view about the main question “What is the students’ education – social event or business”. This is the fundament on what is based the answer of the question “Who is the recipient of education results – the students or companies hiring that students”. Now we are ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Метод за валидиране на входни данни при web базирани приложения Автор: Ганчева, Веска; Gancheva, Veska Дата: 2007 Резюме: The paper presents an approach for fully implementation of a data validation in Web applications. This approach separates the implementation of common data validation reasoning code from the business rules and criteria data used to validate user input. Suggested approach is realized as fourth layer with the possibility to validate data from ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Автоматизирана система за проучване на студентското мнение Автор: Желев, Господин; Jelev, Gospodin; Минкова, Йоана; Minkova, Yoana; Минковска, Даниела; Minkovska, Daniela Дата: 2007 Резюме: The article presents the results of students’ opinion research concerning the quality and effectiveness of the educational process. The research is carried out by means of computerized inquiries, based on “6-models” standard of TSS. The inquiries explore the students’ motivation, educational environment factors, teaching technology and ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: ERP базирана електронна търговия Автор: Маринов, Орлин; Marinov, Orlin; Цанкова, Румяна; Tsankova, Roumiana Дата: 2007 Резюме: Different Forms e- commerce requirements are discussed in this paper. Bulgarian and foreign Sites Experience is investigated. In this way the functional Characteristics of the different commerce Forms and the Possibilities of the advanced information Technologies are satisfied. Flexible architecture Modules for Satisfaction of these ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Паралелен парсинг механизъм за ускоряване на sax парсери Автор: Георгиев, Божидар; Georgiev, Bozhidar Дата: 2007 Резюме: This paper presents a non-traditional approach for acceleration of parsing process in modern W3C-standard XML. Here are described both possibilities for faster parsing procedures- conventional SAX architecture and the parallel parsing concept proposed in this paper. In the article is proven that the parallel parser is faster than traditional ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Повишаване на коефициента на справедливост при клетъчни мрежи за пренос на медицински сигнали и данни Автор: Христов, Валентин; Hristov, Valentin; Димитров, Димитър; Dimitrov, Dimiter Дата: 2007 Резюме: Improving throughput and fairness in Cellular Data Networks is a problem of present interest. Non high throughput and unfairness of data streams and sharing the network resources greatly limit putting into practice and the commercial market wining of such networks and technologies. In article are considered main realized in practice way of ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Генериране на асиметрични периодични сигнали на базата на свързани резонансни системи Автор: Паралиев, Мартин; Paraliev, Martin; Димитров, Димитър; Dimitrov, Dimiter Дата: 2007 Резюме: The coupled resonant systems are an attractive solution if a good energy transfer rate is required and low coupling factor is available. However, these systems have narrow bandwidth that makes them less applicable for signals with more complex harmonic structure. Their analysis utilizes their application for asymmetric periodical signals ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Електрохимично израстване на топологично структурирани дебели слоеве Автор: Йорданов, Никола; Yordanov, Nikola; Филипов, Филип; Philippov, Philip; Видеков, Валентин Христов; Videkov, Valentin Hristov; Арнаудов, Радосвет; Arnaudov, Radosvet Дата: 2007 Резюме: In the present report some basic methods in the electrochemical plating of copper or some other metal layers, at structured topology layout, are revealed. The given arbitrary topology layout could be structured by means of additive or subtractive methods. Technology routes for electrochemical growth of metal structures, as well as their ... Библиотека:
TECHNICAL UNIVERSITY - SOFIA
Заглавие: Алгоритъм за прогнозиране с невронни мрежи Автор: Винчева, Илияна; Vincheva, Iliana Дата: 2007 Резюме: Neural networks are good at classification, forecasting. Forecasting is often used in the decision making process. In this article is built a seven-step neural network forecasting model. Pre and post data processing/analysis skills, data sampling, training criteria and model recommendation will also be covered in this article. Библиотека:
TECHNICAL UNIVERSITY - SOFIA

Показване на публикации 321-340 от 853

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