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

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    Заглавие: System for adjustment and test of algorithms for ECG-data processing  Автор: Iliev, Ivo Tsvetanov; Tabakov, Serafim Dimitrov Дата: 2006 Резюме: The paper presents a high-performance system for adjustment and test of algorithms for data processing, embedded in real ECG devices. An additional advantage of the system is the possibility for simultaneous visualization of the applied test signal and the result after processing. This may be a beneficial tool and considerable reduce the ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Debugging and diagnostic of sensors connected in a network using microcontroller MSP430  Автор: Geshev, Georgi Dotsov; Dimitrov, Emil Nikolov Дата: 2006 Резюме: In this paper is examined monitor program for debugging, adjustment and diagnostic of embedded microprocessor system based on TEXAS Instruments MSP430. It is foreseen to work with it while the separate systems are connected to a local network. After a review of the existing monitor programs and analysis of the available resources in the ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Power electronic devices for wind turbines  Автор: Krusteva, Anastassia Petrova; Marinov, Tsvetan; Hinov, Nikolay Luboslavov Дата: 2006 Резюме: During the last two decades, the production of wind turbines has grown in size from 20 kW to 2 MW. The electrical part of a wind turbine is becoming more and more important and, it is very important to have this system highly integrated into the overall wind turbine design. Electrical developments include the use of advanced power electronics ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Computer simulation of series active power filter  Автор: Petkova, Mariya Petkova; Antchev, Mihail Hristov; Gurgulicov, Vanjo Tomov Дата: 2006 Резюме: The possibility of hysteresis following of a reference sinusoid to control series active power filters as correctors of quality of consumed power from supply network is shown in this paper. This possibility is described using computer simulation. Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Economics reasons to use shunt active power filters  Автор: Antchev, Mihail Hristov; Zobaa, Ahmed Fahem; Petkova, Mariya Petkova Дата: 2006 Резюме: The economics reasons to use shunt active power filters are considered from the point of view of the consumer and producer of electrical power. 3-D diagrams, that give the relationship between load parameters and saving for the consumer and producer of electrical power, are carried out. Experimental results with an estimated saving are given. Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Possibilities of improvement of monitoring and diagnostic process of power electronic devices  Автор: Veselinov, Vladislav Danchev Дата: 2006 Резюме: The present article consider the possibilities of optimization of the control processes on the basis of Digital Parametric Complex. Its main functional centre is presented as a part of conditions for reliability of the analysis of different break-down processes. A summery is made about the influence of the system of control upon the security ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Electrical design of single-phase diode rectifiers with active-capacitive load by MATLAB  Автор: Popov, Evgeniy Ivanov; Pindeva, Liliya Ivanova Дата: 2006 Резюме: Single-phase diode rectifiers with active-capacitive load widely applied in different supplying sources pose specific problems to the engineers. The known methods (‘eastern”, based on the assumption that the voltage across the filtering capacitor is almost even and ‘western”) for their electrical design are graphic-analytical and suffer ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Response of a NAI(TL) scintillation detector in a wide temperature interval  Автор: Tsankov, Ludmil Todorov; Mitev, Mityo Georgiev Дата: 2006 Резюме: The temperature dependence of a NaI(Tl) scintillation detector's response has been studied in the temperature interval (-300C to +500C). Besides the common temperature drift of the light output and that of the decay time of the scintillator, some other very-long-term factors have been observed which give rise to a remarkable hysteresis of ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Reiterated micro contacts  Автор: Videkov, Valentin Hristov Дата: 2006 Резюме: In the present report some micro contacts designs of "dry" type where processes of welding and soldering are not applied are considered. The peculiarities of mechanical contact realization for different structures are discussed. They have been divided into groups according to the plane of the devices. Photos of experimentally made structures ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Two-dimensional physical ac-simulation of gaas hbts  Автор: Palankovski, Vassil; Hristov, Marin Hristov; Philippov, Philipp Ivanov Дата: 2006 Резюме: : In this work, results from fully two-dimensional physical device simulation of Gallium Arsenide (GaAs) heterostructure bipolar transistors (HBTs) are presented. Scattering parameters (S-parameters) are directly obtained from small-signal AC-analysis of real devices. A comparison reveals very good agreement with measured data. Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Wave soldering quality improvement by design of experiment approach  Автор: Andonova, Anna Vladova; Dinkova, Nely; Marinov, Ivan Дата: 2006 Резюме: The investigation deals with quality improvement of wave soldering joints for printed circuit boards (PCB) by using DOE approach. Using DOE pro XL capabilities, DOE and statistic process control an effective way to approach and evaluate wave soldering process development is offered to determine the most essential control parameters in order ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Three-dimensional microfabrication of high-aspect-ratio structures using dry negative photoresist  Автор: Andreev, Svetozar Krastev; Georgieva, Adriana Kirilova; Todorov, Svetlin Stefanov Дата: 2006 Резюме: The development of anisotropic, high-aspect-ratio micromachining processes has provided opportunity for the extension of silicon microfabrication capability well into the third dimension. For some applications, however, truly 3D structures are desired, especially those that possess arbitrary surface height profiles, i.e., surfaces with ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Production of 3D contact structures using the LIGA method  Автор: Videkov, Valentin Hristov; MIhaylova, Evelina Aleksandrova; Andreev, Svetozar Krastev; Iordanov, Nikola Stefanov Дата: 2006 Резюме: The purpose of this report is finding an alternative method for 3D contact structures production, which is different from traditional silicon technology. The LIGA method showed capability of preparing such structures. For that purpose the technological sequence for LIGA process implementation in making of functional contact is investigated ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Ionization chamber based on RF sputtered ITO thin films  Автор: Boiadjiev, Stefan Ivanov; Marinov, Boris Marinov; Dobrikov, Georgi Hristov; Yordanov, Rumen Stoyanov; Minkova-Rassovska, Milka Markova Дата: 2006 Резюме: The present work presents a new type ionization chambers for x-ray dose meters, based on indium-tin oxide (ITO) thin films. ITO attract our attention as promising material with various applications, here in our study as a transparent conducting coating, but also for transparent conductive electrodes in displays, solar cells and many other ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Investigation of the effective thermal conductivity of PCB  Автор: Andonova, Anna Vladova; Kafadarova, Nadja Miteva; Pavlov, Galin Дата: 2006 Резюме: The investigation deals with the numerical solution of the 3D heat conduction equatioin and study variation of the effective conductivity of PCB with different component size. Cases with and without a copper layer on the component side and different PCB thicknesses were investigated. It was shown that the effective thermal conductivity of ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Class E power amplifier for bluetooth applications  Автор: Antonova, Olga Jorova; Angelov, George Stoychev; Draganov, Valentin Дата: 2006 Резюме: The main purpose of this paper is to present the design of a class E power amplifier for Bluetooth Class 1 application. The power amplifier has to provide 20 dBm output power and as high as possible power efficiency at 1.5V power supply voltage, for 0.35µm CMOS Austria Microsystems (AMS) technology. Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: CMOS VCO design  Автор: Hristov, Marin Hristov; Rashev, Ivan Krasimirov; Arabadzhiev, Dobromir Nikolov Дата: 2006 Резюме: In this article , the design of quadrature voltage controlled oscillator (Q-VCO), which covers the Bluetooh requirements is described. A methodology which makes easy the design of oscillators with negative resistance is shown. Standard 0.35um CMOS process was used. The circuit is fully monolithic, and this decreases its price. The oscillator ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Capacitors dc-dc converters for RF implementation  Автор: Brusev, Tihomir Sashev; Goranov, Petar Trifonov; Hristov, Marin Hristov Дата: 2006 Резюме: Two separate capacitor’s dc-dc converters for RF implementation are analyzed. The goal of this work is to be skipped the negative effects of the integrated inductors, which can destroy the circuit’s parameters. Simulations results demonstrated in this paper were done with AMS CMOS 0.35 µm process. Presented architectures are suitable for ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Efficiency investigation of buck dc-dc converter for rf applications  Автор: Brusev, Tihomir Sashev; Goranov, Petar Trifonov; Hristov, Marin Hristov; Slavo, Rosen Nikolaev Дата: 2006 Резюме: This paper was focused over the efficiency evaluation and optimization of switchmode dc-dc converter for RF applications. AMS CMOS 0.35 µm technology was used for investigations. Effect of different factors over the circuit’s behavior was considerate. Soft-switching control techniques was analyzed and compared with basic regulation’s method ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA
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    Заглавие: Electrochemical formation of three-dimensional golden microcontacts  Автор: Yordanov, Nikola Stefanov; Andreev, Svetozar Krastev; Ivanova, Filipina; Arnaudov, Radosvet Georgiev Дата: 2006 Резюме: Electroplating of golden layers is often used in the microelectronic devices. This paper reports our experimental results from formation of golden micro - contact elements – bumps with diameter 300µm, developed by UV-LIGA process. The gold-acid-cyanide electrolyte, which is used, has no influence on the dry negative photo-resist (PR). We ... Библиотека:
    TECHNICAL UNIVERSITY - SOFIA

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