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Cem des implants médicaux actifs
ISBN: 9786131546068 / Francuski / Miękka / 220 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Cet ouvrage presente une methode permettant d'etudier le comportement des stimulateurs cardiaques vis-a-vis des perturbations electromagnetiques de basse frequence. Les bases theoriques du bioelectromagnetisme, le fonctionnement electrique du c ur et une description fonctionnelle des stimulateurs cardiaques sont presentees. Au niveau experimental, un banc de mesure comportant une source de champ magnetique et un modele equivalent tissu destine a effectuer les essais in vitro est propose. Du point de vue modelisation, les potentiels induits, aux bornes de stimulateurs cardiaques soumis a des...
Cet ouvrage presente une methode permettant d'etudier le comportement des stimulateurs cardiaques vis-a-vis des perturbations electromagnetiques de ba...
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cena:
364,56 zł |
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Électronique Et Télécommunication (Comportement Des Antennes)
ISBN: 9786131565205 / Francuski / Miękka / 76 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Dans ce travail, on s''intA(c)resse A l''A(c)tude d''une antenne rectangulaire A ouverture, on fait un calcul simple pour trouver les champs dans ce dernier, le gain, le diagramme de rayonnement. Notre objectif et de calculer les champs sortants dans l''ouverture les calcule sont en domaine frA(c)quentiel. AprA]s avoir les champs sortants dans l''ouverture en le transforme au domaine temporel avec une mA(c)thode d''analyse qu''on appelle diffA(c)rence finie FDTD cette mA(c)thode elle s''intA(c)resse aux A(c)quations de Maxwell, on montre notamment qu''en rA(c)gime stationnaire, les champs...
Dans ce travail, on s''intA(c)resse A l''A(c)tude d''une antenne rectangulaire A ouverture, on fait un calcul simple pour trouver les champs dans ce d...
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cena:
130,94 zł |
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Réponse radar cohérente et polarimétrique de la végétation sahélienne
ISBN: 9786131583063 / Francuski / Miękka / 232 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Un modA]le cohA(c)rent de diffusion est dA(c)veloppA(c) en aide A la comprA(c)hension de la rA(c)ponse radar de la vA(c)gA(c)tation sahA(c)lienne. Cette vA(c)gA(c)tation est principalement composA(c)e de ligneux et des herbacA(c)es annuelles. Le gA(c)nA(c)rateur de la vA(c)gA(c)tation prend en compte la morphologie des ligneux et des herbacA(c)es. Le houppier des ligneux est reprA(c)sentA(c) comme contenu dans un volume cylindrique ou ellipsoAdal dA(c)pendant de la forme du ligneux. Par ailleurs, le gA(c)nA(c)rateur reprA(c)sente les herbacA(c)es comme un ensemble de tiges cylindriques et de...
Un modA]le cohA(c)rent de diffusion est dA(c)veloppA(c) en aide A la comprA(c)hension de la rA(c)ponse radar de la vA(c)gA(c)tation sahA(c)lienne. Cet...
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cena:
315,60 zł |
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Michael Faraday and the Electrical Century (Icon Science)
ISBN: 9781785782671 / Angielski / Miękka / 224 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The fascinating world of Michael Faraday
The fascinating world of Michael Faraday
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cena:
45,68 zł |
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Reciprocity, Spatial Mapping and Time Reversal in Electromagnetics
ISBN: 9789400715295 / Angielski / Twarda / 317 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This long awaited second edition traces the original developments from the 1970s and brings them up to date with new and previously unpublished material to give this work a new lease of life for the early twenty-first century and readers new to the topic. In the winter of 1970-71, Colman Altman had been finding almost exact symmetries in the computed reflection and transmission matrices for plane-stratified magnetoplasmas when symmetrically related directions of incidence were compared. At the suggestion of Kurt Suchy the complex conjugate wave fields, used to construct the eigenmode...
This long awaited second edition traces the original developments from the 1970s and brings them up to date with new and previously unpublished materi...
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cena:
383,73 zł |
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Geometrical Theory of Diffraction for Electromagnetic Waves
ISBN: 9780863410628 / Angielski / Miękka / 300 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The continuous development of the Geometrical Theory of Diffraction (GTD), from its conception in the 1950s, has now established it as a leading analytical technique in the prediction of high-frequency electromagnetic radiation and scattering phenomena. Consequently, there is an increasing demand for research workers and students in electromagnetic waves to be familiar with this technique. In this book they will find a thorough and clear exposition of the GTD formulation for vector fields. It begins by describing the foundations of the theory in canonical problems and then proceeds to develop...
The continuous development of the Geometrical Theory of Diffraction (GTD), from its conception in the 1950s, has now established it as a leading analy...
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cena:
391,23 zł |
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Analysis of Disc-Loaded Circular Waveguides for Wideband Gyro-Twts
ISBN: 9783838311456 / Angielski / Miękka / 220 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. An urge to fill up the mm-wave technology gap in the high-power regime, where a large number of civilian and military applications exist, has led to extensive research and development activities in fast-wave gyro-sources and amplifiers. Although one such gyro-source, namely, the gyrotron is now commercially available for applications such as in plasma heating and material processing, the gyro-amplifiers like the gyro- klystron and the gyro-TWT are still in the laboratory stage of development. The gyro-TWT using a non-resonant waveguide supporting propagating waves enjoys a wider...
An urge to fill up the mm-wave technology gap in the high-power regime, where a large number of civilian and military applications exist, has led t...
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cena:
356,69 zł |
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Three Novel Experiments on Wheatstone's Bridges
ISBN: 9783838367101 / Angielski / Miękka / 92 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This is a compilation of three dissertations based on experimental projects by final year undergraduate students of Jhargram Raj College, Jhargram-721507, West Bengal, India. The topics embody a detailed idea of Wheatstones Bridge as a basic tool for electrical circuit networks, its different applications in direct and alternating circuits, some new experiments based on it. The first and second chapter gives ideas of Wheatstones Bridge and different types it. The third chapter determines variation of low resistance of manganin wire with the help of Kelvin double Bridge. In the...
This is a compilation of three dissertations based on experimental projects by final year undergraduate students of Jhargram Raj College, Jhargram-...
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cena:
221,24 zł |
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Development and Evaluation of Novel FDTD Methods
ISBN: 9783838339016 / Angielski / Miękka / 188 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. |
cena:
307,02 zł |
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Microwave Imaging of Biological Structures
ISBN: 9783838368061 / Angielski / Miękka / 144 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Over the past several years, microwave imaging has grown as a promising technique for the imaging of biological structures. Thanks to the high sensitivity, simplicity, low cost and the use of non-ionizing radiations, it seems to be a valid complement to the more traditional techniques, such as radiography, magnetic resonance and ultrasound. In this work, the capability of the microwave imaging technique to detect early stage breast cancer and lesions of the knee (in particular meniscal tears and lesions of the tendons) is analysed. For both the applications, a preliminary numerical study is...
Over the past several years, microwave imaging has grown as a promising technique for the imaging of biological structures. Thanks to the high sensiti...
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cena:
266,39 zł |
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Electromagnetic Modeling with Wave Tilt and Reflection Coefficient
ISBN: 9783838377421 / Angielski / Miękka / 380 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This work aims at formulating models based on the Maxwell equations, using earth parameters such as conductivity, permeability, permittivity and surface wave impedance. Three measurable field parameters; Amplitude of the correction factor to the wave tilt, Q; phase of Q, and reflection coefficient were calculated from the model with various conductivity contrasts over a layered media. Two cases of a top layer overlying a more resistive basement and a conductive top layer overlying a resistive basement were considered with a radio frequency of 125kHz and a VLF of 20kHz, which are within the...
This work aims at formulating models based on the Maxwell equations, using earth parameters such as conductivity, permeability, permittivity and surfa...
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cena:
356,69 zł |
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A New Approach for Wire Antennas Design
ISBN: 9783838341538 / Angielski / Miękka / 272 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Nowadays, Navy ship decks are more and more 'crowded' with antennas. Often, in the design stage, brass scale models are used by the Navies of many countries to evaluate radiators' impedances and their layout. This approach may suffer from inaccuracies due to scalability and can be quite time consuming and costly. A possible different approach is the one pursued in this work, where accurate modeling of radiators (wires, loaded wires, loaded wires on ground planes, etc.) has been combined with efficient global optimization techniques. As bees in a swarm looking for the best flower, global...
Nowadays, Navy ship decks are more and more 'crowded' with antennas. Often, in the design stage, brass scale models are used by the Navies of many cou...
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cena:
356,69 zł |
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Advanced Optimization Techniques in Electromagnetics
ISBN: 9783838373263 / Angielski / Miękka / 224 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This work is relevant to the electromagnetic area. Two advanced optimization techniques have been developed and applied to solve problems in both antennas and space applications fields. In the former case a Genetic Algorithm (GA) has been used to optimize high-impedance surfaces aimed to improve antennas performance. In the second application, an ad-hoc Particle Swarm Optimization (PSO) has been implemented to solve multiple dipole modelling problems for spacecraft magnetostatic cleanliness design drivers.
This work is relevant to the electromagnetic area. Two advanced optimization techniques have been developed and applied to solve problems in both ante...
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cena:
356,69 zł |
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Numerical Methods for Simulation of Diffusion and Wave Propagation
ISBN: 9783838387314 / Angielski / Miękka / 140 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Development of numerical methods to solve partial differential equations is extremely important as most of the real life physical systems can be formulated in the form of these. By solving partial differential equations, the characteristics of a physical system can be simulated even without performing laboratory experiments. This book discusses the development of few efficient numerical tools to solve diffusion and wave equation. Methods for treating diffusion of atoms, molecules, ions and charge carriers in solid state and optoelectronic structures are presented. Additionally, split-step...
Development of numerical methods to solve partial differential equations is extremely important as most of the real life physical systems can be formu...
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cena:
266,39 zł |
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PROPAGATION OF SEVEN NEW SH-SAWs IN PIEZOELECTROMAGNETICS OF CLASS 6mm
ISBN: 9783843364034 / Angielski / Miękka / 84 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This book addresses to theoretical investigations of shear-horizontal surface acoustic waves (SH-SAWs) propagating in composites of class 6 mm which can possess piezoelectric and piezomagnetic phases. Applying different electrical and magnetic boundary conditions in the theoretical treatments, wave characteristics of seven new SH-SAWs are obtained in explicit forms. It was found that the new SH-SAWs can have both piezoelectric and piezomagnetic properties. Also, the analytically obtained exact formulae for the new SH-SAW velocities can demonstrate dependencies on the squared speed of light in...
This book addresses to theoretical investigations of shear-horizontal surface acoustic waves (SH-SAWs) propagating in composites of class 6 mm which c...
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cena:
232,30 zł |
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Validation of Remotely Sensed Soil Moisture Observations
ISBN: 9783843358187 / Angielski / Miękka / 208 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. Soil moisture controls the physical processes that exchange mass and energy between the atmosphere and the land surface in the hydrologic cycle.Improved observations of soil moisture may lead to improvements in weather forecasting,seasonal climate prediction,and our understanding of the physical,chemical and biological processes that occur within the soil.Recent advances in remote sensing have shown that microwave radiometry is a suitable approach to retrieve soil moisture.However,the quantitative aspects of remotely sensed soil moisture observations are not well-known,and...
Soil moisture controls the physical processes that exchange mass and energy between the atmosphere and the land surface in the hydrologic cycle.Impr...
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cena:
356,69 zł |
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Dispersive Saws in Layered Systems Consisting of Cubic Piezoelectrics
ISBN: 9783843375238 / Angielski / Miękka / 72 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. This work studies propagation of different SH-SAWs treating various configurations using the cubic crystals Bi12SiO20 and Bi12GeO20, which possess strong piezoelectric effect. Possible cuts for the wave propagation are treated when an even-order symmetry axis of a crystal is perpendicular to the sagittal plane, and when some analytical solutions can be obtained studying propagation direction [101] in the crystals. Calculations of the phase velocity and the CEMC versus the layer thickness were carried out. Numerical results on propagation of the seven-partial Love type waves were also...
This work studies propagation of different SH-SAWs treating various configurations using the cubic crystals Bi12SiO20 and Bi12GeO20, which possess str...
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cena:
221,24 zł |
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The Dipole Radiation
ISBN: 9783844307566 / Angielski / Miękka / 80 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. The theory of physical phenomena called "the dipole radiation" is full of surprises. The book starts with one of them. Let a particle does not produce any electric or magnetic field due to lack of charge and dipole moment, but at some moment of time $t=0$, it polarizes and since this moment on, produces a stationary dipole field. Due to the causality principle, the filed is cut at the distance $ct$. Then its lines of force have endpoints which signify presence of electric charge. On one hand, this picture follows straightforwardly from the theory of retarded potentials, on the...
The theory of physical phenomena called "the dipole radiation" is full of surprises. The book starts with one of them. Let a particle does not produ...
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cena:
89,85 zł |
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Atmospheric Profiling by GPS Radio Occultation
ISBN: 9783844308716 / Angielski / Miękka / 80 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. GPS RO is a global sounding technique providing atmospheric profiles useful for numerical weather prediction and climate studies. The system sounds the Earth's atmosphere evaluating the delay affecting the passing radio signal. Such a delay is processed to retrieve profiles of refractivity at global scale, and subsequently temperature, pressure and humidity. In the lower atmosphere the classical retrieval schemes need of additional information, e.g. of the knowledge of temperature from independent observations at each GPS occultation. This book proposes a method based on neural networks to...
GPS RO is a global sounding technique providing atmospheric profiles useful for numerical weather prediction and climate studies. The system sounds th...
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cena:
221,24 zł |
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Mutual Coupling in Patch Antennas
ISBN: 9783844309324 / Angielski / Miękka / 84 str. Termin realizacji zamówienia: ok. 5-8 dni roboczych. With the drive towards better and faster communication systems, wireless communications has assumed a new significance in todays world. In this context, it becomes all the more important to increase the efficiency of the antennas involved with these systems. Patch antennas are used because of their popularity arising from their adaptability and unobtrusive nature. Here we have tried to look at an optimum design for a patch antenna and also the best possible feed network for the same which would enhance its radiation properties as has been shown through the results obtained here. Furthermore,...
With the drive towards better and faster communication systems, wireless communications has assumed a new significance in todays world. In this contex...
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cena:
221,24 zł |
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