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A New Type High Gain Antenna
ISBN: 9783847317661 / Angielski / Miękka / 68 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. A quasi-Landstorfer antenna exhibits both the characteristics of a high-gain antenna as well as a small-sized antenna. This antenna extracts the advantages of both the quasi-Yagi antenna and the Landstorfer antenna. The quasi-Landstorfer antenna will be suitable for wireless applications. Moreover, there will be more developments on this antenna in the future but this book will be the pioneer for all of them. All the necessary theories and working principle of the antenna have been described explicitly in this book. A detailed description of all the measurement setup has also been provided....
A quasi-Landstorfer antenna exhibits both the characteristics of a high-gain antenna as well as a small-sized antenna. This antenna extracts the advan...
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219,18 |
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Instrumentation for AC Conductivity Measurement
ISBN: 9783846596449 / Angielski / Miękka / 92 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. A general introduction to ac conductivity and a specific introduction to Complex Impedance Spectroscopy (CIS) technique are dealt with in Chapter 1. To acquire information on the work done already in this direction, literature survey is being carried out. Chapter 2 comprises of the review of the literature, namely the various experimental techniques developed by earlier workers in this direction. The third chapter is divided into two parts. The first part deals with the instrumentation developed in the present study. The second part of this chapter comprises of the calibration of the...
A general introduction to ac conductivity and a specific introduction to Complex Impedance Spectroscopy (CIS) technique are dealt with in Chapter 1. ...
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219,18 |
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Mid-infrared quantum cascade lasers
ISBN: 9783846588376 / Angielski / Miękka / 208 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This work describes the work performed by the author at the ETH Zurich, under the supervision of Prof. Jerome Faist on the optimization of high performance quantum cascade lasers (QCLs) in the Mid-IR spectral region. The main factors influencing laser performance have therefore been analyzed. In particular the optimization of the laser design in order to improve the electron tranport and the optical gain. In addition a detailed analysis of the fabrication process is performed and a novel process scheme is presented for buried heterostructure lasers.
This work describes the work performed by the author at the ETH Zurich, under the supervision of Prof. Jerome Faist on the optimization of high perfo...
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353,37 |
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Synergetic Control
ISBN: 9783838320069 / Angielski / Miękka / 104 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This book offers a new approach to control design for DC converter-based power distribution systems, which are an attractive alternative to AC power distribution due to flexible power sharing and nearly instantaneous reconfiguration; a decrease of overall system cost and weight; and an increase of reliability. The Synergetic Control Theory offers solutions to such challenges of control design as nonlinearity, multi-connectivity, and high-dimensionality of these systems. This control design uses an analytical procedure to shift the focus of the designer from analysis of the closed loop system...
This book offers a new approach to control design for DC converter-based power distribution systems, which are an attractive alternative to AC power d...
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219,18 |
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Carbon Nanotube and Polypyrrole Supercapacitors
ISBN: 9783838340715 / Angielski / Miękka / 612 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Electrochemical capacitors also called supercapacitors are electrical energy storage devices filling the performance gap of conventional capacitors and batteries. They can store energy electrostatically at the electrode/electrolyte interface (double layer capacitance) and/or via Faradaic charge storage through reversible successive redox processes (pseudocapacitance). As such they achieve higher energy densities compared to dielectric capacitors while delivering significantly higher power than batteries. The amount of ion accessible surface area of the electrode material and the amount of...
Electrochemical capacitors also called supercapacitors are electrical energy storage devices filling the performance gap of conventional capacitors an...
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353,37 |
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Tdcv Characterization of Defects in Ultra Thin Sio2 Kinds of Films
ISBN: 9783838351544 / Angielski / Miękka / 120 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. When a MOS structure (Metal Oxide Semiconductor) is subjected to an external perturbation, defects are generated in the oxide and at the oxide-semiconductor interface. If one can easily measure distinctively the interface states and the oxides defects with the electrical method, it is difficult to separate between the different kinds of oxides defects and to obtain a microscopic nature of these defects. In this work, we are using a procedure that we have defined and which derives from a capacitive method known under the name of Jenq method in order to get further information on the proceeding...
When a MOS structure (Metal Oxide Semiconductor) is subjected to an external perturbation, defects are generated in the oxide and at the oxide-semicon...
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219,18 |
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Evolutionary Algorithms for Power Distribution System Planning
ISBN: 9783838371085 / Angielski / Miękka / 168 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The planning of power distribution systems consists in determining the optimum site and size of new substations and feeders in order to satisfy the future power demand with minimum investment and operational costs and an acceptable level of reliability. This problem is a combinatorial, non-linear and constrained optimization problem. Several solution methods based on genetic algorithms have been reported in the literature; however, some of these methods have been reported with applications to small systems while others have long solution time. In addition, the vast majority of the ...
The planning of power distribution systems consists in determining the optimum site and size of new substations and feeders in order to satisfy the f...
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304,16 |
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Vapor Phase Deposition of Organic Semiconductors
ISBN: 9783838396606 / Angielski / Miękka / 268 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The coming of age of organic circuits requires the development of high-performance and cost-effective processing techniques. In this work, the Organic Vapor Phase Deposition (OVPD ) is investigated for the production of thin semiconducting films used as the active layer of circuits. Two OVPD systems are described: A Static system that is inspired from a chemical vapor phase deposition tool and an In-line system that accommodates a linearly moving substrate and is roll-to-roll compatible. These two tools are tested for the growth of pentacene and PTCDI-C13, two high-mobility organic...
The coming of age of organic circuits requires the development of high-performance and cost-effective processing techniques. In this work, the Organic...
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353,37 |
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EMC aspects of PWM inverter fed AC motor drive system
ISBN: 9783838333823 / Angielski / Miękka / 152 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. PWM inverters are widely used in industrial, commercial and residential application such as motor drives. In three-leg inverters for three-phase applications the occurrence of common mode voltage is inherent due to asymmetrical output pulses. It has been found that the high dv/dt and high switching frequency together with the common mode voltages generated by PWM inverters have caused many adverse effects such as shaft voltage, bearing current, leakage current, motor terminal over voltage and electromagnetic interference (EMI). The EMI generated by such systems is increasingly ...
PWM inverters are widely used in industrial, commercial and residential application such as motor drives. In three-leg inverters for three-phase ap...
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263,91 |
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The Support of Renewable Electricity in the Eu
ISBN: 9783843372770 / Angielski / Miękka / 76 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Renewable power can't compete with fossil fuels without financial support because they are expensive and their technologies are not yet mature enough. As a result, support schemes are in place. However, the multitude of support schemes raises concerns from the angle of a single EU electricity market. Solutions at the national level may alter competition in the EU internal market. Then, is there a need to integrate the support schemes and have a single support scheme applicable throughout the EU? Since there are benefits and drawbacks to integration, is integration required? This analysis...
Renewable power can't compete with fossil fuels without financial support because they are expensive and their technologies are not yet mature enough....
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219,18 |
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Mismatch Losses in Grid-Connected Photovoltaic Installations
ISBN: 9783843372602 / Angielski / Miękka / 212 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The rapid expansion of photovoltaic (PV) systems has revealed the presence of losses due to module coupling, better known as mismatch losses, that deprive producers from additional and available electric energy. This book aims to better understand the causes and mechanisms of mismatch losses in grid-connected installations. Two solutions to reduce these losses are proposed, studied, and compared. Also, the modelling techniques for PV systems submitted to shade, along with experimental results, will be presented. The first solution proposed consists in modifying the connection scheme of the...
The rapid expansion of photovoltaic (PV) systems has revealed the presence of losses due to module coupling, better known as mismatch losses, that dep...
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353,37 |
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Electromagnetic Modeling of Planar Array Structures
ISBN: 9783845403557 / Angielski / Miękka / 140 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Large sized planar structures are increasingly being employed in satellite and radar applications. But due to large electrical size and complex cellular patterns of modern designs, full-wave analysis of these structures requires enormous memory and processing requirements. Therefore conventional techniques based on linear meshing either fail to simulate such structures or require resources not available to a common antenna designer. A novel technique called Scale-changing Technique (SCT) addresses this problem by partitioning the cellular array geometry in numerous nested domains defined at...
Large sized planar structures are increasingly being employed in satellite and radar applications. But due to large electrical size and complex cellul...
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263,91 |
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Detection Methods of Organic Acids in Steam/Water Circuits
ISBN: 9783844323795 / Angielski / Miękka / 152 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This study was initiated as a response to a challenge faced by coal fired power stations both nationally and internationally. It was found that there was a large degree of damage caused by 'pitting'to the turbines in spite of the high purity of water used, possibly related to the acids generated at high temperatures. In light of this, a relatively simple method for determination of short chain organic acids was identified by comparing the efficiency of several methods. This book contains the comparative study between high performance liquid chromatography methods using ion exclusion and...
This study was initiated as a response to a challenge faced by coal fired power stations both nationally and internationally. It was found that there ...
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263,91 |
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Analysis of Brushless DC Motors
ISBN: 9783844326611 / Angielski / Miękka / 80 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Brushless dc motors with Hall sensors are widely used in various industrial and electromechanical applications. These machines have often been considered in the literature, under one common assumption - ideal placement of the sensors, which is often not the case, especially for low-precision motors. This thesis is composed of three manuscripts which investigate the unbalance of Hall sensors and propose methods to eliminate its adverse effects. The studies presented here show that misalignment of Hall sensors leads to unbalanced operation of the inverter and motor phases, which in turn...
Brushless dc motors with Hall sensors are widely used in various industrial and electromechanical applications. These machines have often been consi...
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219,18 |
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Compensation of Voltage Sag and Swells by Custom Power Devices
ISBN: 9783847318095 / Angielski / Miękka / 76 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This book presents theoretical and application topics in power quality in distribution systems.With this book we wished to create a resource that is relevant to the needs of the working Power System engineers by helping bridge the theory and simulation work. A Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency that results in a failure or a mal-operation of end use equipments. Utility distribution networks, sensitive industrial loads and critical commercial operations suffer from various types of outages and service interruptions which can cost...
This book presents theoretical and application topics in power quality in distribution systems.With this book we wished to create a resource that is r...
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219,18 |
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Hole Dynamics in a 2D Quantum Antiferromagnet
ISBN: 9783846597101 / Angielski / Miękka / 140 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Layered structures of the high Tc superconductors have reinstigated the study of two dimensional (2D) antiferromagnetic spin systems and their charge dynamics for more than a couple of decades now. As a hole moves through such a system it interacts with spin waves and phonons at finite temperature. This book contains systematic derivation of the hole spectral functions in a 2D t-J model and its extensions numerically by first finding the spin waves using linear spin wave approximation and then solving the hole Dysons equation within the Non-crossing approximation. The role of different...
Layered structures of the high Tc superconductors have reinstigated the study of two dimensional (2D) antiferromagnetic spin systems and their charge ...
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263,91 |
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Fundamentos electromagnéticos de la Revolución Tecnológica
ISBN: 9783847364054 / Hiszpański / Miękka / 68 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Las fuerzas entre corrientes mediadas por campos magneticos magnificados miles de veces por la polarizacion de materiales ferro-magneticos (motores) y campos electricos inducidos por campos magneticos variables (generadores y transformadores) son los fenomenos fisicos fundamentales subyacentes en el funcionamiento de las maquinas electricas que sostienen la matriz mundial de energia electrica. Dichos desarrollos tecnologicos se basa en el descubrimiento de fenomenos electromagneticos realizados hacia principios del siglo XIX por los fisicos Oersted, Ampere, Faraday y otros. Es sobre esta base...
Las fuerzas entre corrientes mediadas por campos magneticos magnificados miles de veces por la polarizacion de materiales ferro-magneticos (motores) y...
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129,72 |
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Structured Light Fields: Applications in Optical Trapping, Manipulation, and Organisation
ISBN: 9783642293221 / Angielski / Twarda / 136 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The optical trapping of colloidal matter is an unequalled field of technology for enabling precise handling of particles on microscopic scales, solely by the force of light.Although the basic concept of optical tweezers, which are based on a single laser beam, has matured and found a vast number of exciting applications, in particular in the life sciences, there are strong demands for more sophisticated approaches. This thesis gives an introductory overview of existing optical micromanipulation techniques and reviews the state-of-the-art of the emerging field of structured light fields and...
The optical trapping of colloidal matter is an unequalled field of technology for enabling precise handling of particles on microscopic scales, solely...
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402,53 |
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Ferromagnetic resonance study of the Half-Heusler alloy NiMnSb
ISBN: 9783838131368 / Angielski / Miękka / 120 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Since the discovery of spin torque in 1996, independently by Berger and Slonczewski, and given its potential impact on information storage and communication technologies, (e.g. through the possibility of switching the magnetic configuration of a bit by current instead of a magnetic field, or the realization of high frequency spin torque oscillators (STO)), this effect has been an important field of spintronics research. One aspect of this research focuses on ferromagnets with low damping. The lower the damping in a ferromagnet, the lower the critical current that is needed to induce switching...
Since the discovery of spin torque in 1996, independently by Berger and Slonczewski, and given its potential impact on information storage and communi...
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241,09 |
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Ondas de Densidad de Espín en el compuesto casi-2D CuFeTe2
ISBN: 9783847369257 / Hiszpański / Miękka / 140 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Los sistemas de dimensionalidad reducida son el foco de atencion de muchos estudios en fisica de la materia condensada. Los electrones en estos sistemas estan confinados a geometrias que los obligan a interaccionar fuertemente entre si, dando lugar a una rica variedad de comportamientos y transiciones de fase. Las inestabilidades del gas de electrones libres llevan a la aparicion a bajas temperaturas de estados fundamentales como la superconductividad, Ondas de Densidad de Carga (ODC) u Ondas de Densidad de Espin (ODE). En esta obra se presenta suficiente evidencia experimental que apoya la...
Los sistemas de dimensionalidad reducida son el foco de atencion de muchos estudios en fisica de la materia condensada. Los electrones en estos sistem...
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219,18 |
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