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Antennas represent a critical technology in any of these wireless systems. Not only do they directly affect the received power of the system, they are also typically the largest and most visible part. Recently, the need for low-cost, low-profile, and lightweight antenna in the frequency range of the microwave/millimeter wave/THz band has regained momentum. "Basic Principles of Fresnel Antenna Arrays" provides us a with the basics of the various Fresnel Antenna approaches, in order to achieve low-cost, low-profile, and lightweight antenna in the microwave/millimeter wave band. A potential solution of the antenna problem lies in using lens technology in an array. The Fresnel zone plate lens (FZPL) antenna is in particular an interesting candidate for the array element. The limiting focusing properties of FZPL including subwave length focus are described in detail. The book further presents a novel hexagonal FZPL antenna which can be more effectively packed in an array due to its shape. Before considering the hexagonal FZPL antenna in an array, the authors investigate two ideas, described as methods to potentially improve the radiation characteristics. The first idea is to change the reference phase of the Fresnel zone radii - a novel free parameter in the usual design of zone plate’s lenses and antennas. To further improve the radiation characteristics of the hexagonal FZPL antenna, a technique involving Fresnel zone rotation is investigated. The book is of interest for designers of optical systems because taking scaling effects into account, the characteristics of diffractive quasioptical elements are valid for diffractive focusing elements of integrated optics.
Lens antennas. --- Fresnel lenses. --- Antenna arrays. --- Arrays, Antenna --- Antennas (Electronics) --- Large space structures (Astronautics) --- Lenses --- Computer engineering. --- Microwaves. --- Electrical Engineering. --- Microwaves, RF and Optical Engineering. --- Optics, Lasers, Photonics, Optical Devices. --- Hertzian waves --- Electric waves --- Electromagnetic waves --- Geomagnetic micropulsations --- Radio waves --- Shortwave radio --- Computers --- Design and construction --- Electrical engineering. --- Optical engineering. --- Lasers. --- Photonics. --- New optics --- Optics --- Light amplification by stimulated emission of radiation --- Masers, Optical --- Optical masers --- Light amplifiers --- Light sources --- Optoelectronic devices --- Nonlinear optics --- Optical parametric oscillators --- Mechanical engineering --- Electric engineering --- Engineering
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This book is planned to publish with an objective to provide a state-of-art reference book in the area of computational fluid dynamics for CFD engineers, scientists, applied physicists and post-graduate students. Also the aim of the book is the continuous and timely dissemination of new and innovative CFD research and developments. This reference book is a collection of 14 chapters characterized in 4 parts: modern principles of CFD, CFD in physics, industrial and in castle. This book provides a comprehensive overview of the computational experiment technology, numerical simulation of the hydrodynamics and heat transfer processes in a two dimensional gas, application of lattice Boltzmann method in heat transfer and fluid flow, etc. Several interesting applications area are also discusses in the book like underwater vehicle propeller, the flow behavior in gas-cooled nuclear reactors, simulation odour dispersion around windbreaks and so on.
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This book provides an overview of ultrafast ultrasound imaging, 3D high-quality ultrasonic imaging, correction of phase aberrations in medical ultrasound images, etc. Several interesting medical and clinical applications areas are also discussed in the book, like the use of three dimensional ultrasound imaging in evaluation of Asherman's syndrome, the role of 3D ultrasound in assessment of endometrial receptivity and follicular vascularity to predict the quality oocyte, ultrasound imaging in vascular diseases and the fetal palate, clinical application of ultrasound molecular imaging, Doppler abdominal ultrasound in small animals and so on.
Radiology, Medical. --- Clinical radiology --- Radiology, Medical --- Radiology (Medicine) --- Medical physics --- Radiology --- Medical radiology.
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Optical materials. --- Photonics. --- Lasers. --- Light amplification by stimulated emission of radiation --- Masers, Optical --- Optical masers --- Light amplifiers --- Light sources --- Optoelectronic devices --- Nonlinear optics --- Optical parametric oscillators --- New optics --- Optics --- Materials
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Electronics and optics of solids --- Spectrometric and optical chemical analysis --- fysicochemie --- spectrometrie --- optica
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This book describes the recently-discovered artificially curved light beam known as the photonic hook. Self-bending of light, a long-time goal of optical scientists, was realized in 2007 with the Airy beam, followed by the first demonstration of the photonic hook by the authors of this book and their collaborators in 2015 and experimentally in 2019. The photonic hook has curvature less than the wavelength, along with other unique features described in this book that are not shared by Airy-like beams, and so deepens our understanding of light propagation. This book discusses the general principles of artificial near-field structured curved light and the full-wave simulations of the photonic hook along with their experimental confirmation. The book goes on to show how the photonic hook has implications for acoustic and surface plasmon waves and as well as applications in nanoparticle manipulation.
Vibrations --- Optics. Quantum optics --- Electronics --- geluidsleer --- akoestiek --- photonics --- microwaves --- optica
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Antennas represent a critical technology in any of these wireless systems. Not only do they directly affect the received power of the system, they are also typically the largest and most visible part. Recently, the need for low-cost, low-profile, and lightweight antenna in the frequency range of the microwave/millimeter wave/THz band has regained momentum. "Basic Principles of Fresnel Antenna Arrays" provides us a with the basics of the various Fresnel Antenna approaches, in order to achieve low-cost, low-profile, and lightweight antenna in the microwave/millimeter wave band. A potential solution of the antenna problem lies in using lens technology in an array. The Fresnel zone plate lens (FZPL) antenna is in particular an interesting candidate for the array element. The limiting focusing properties of FZPL including subwave length focus are described in detail. The book further presents a novel hexagonal FZPL antenna which can be more effectively packed in an array due to its shape. Before considering the hexagonal FZPL antenna in an array, the authors investigate two ideas, described as methods to potentially improve the radiation characteristics. The first idea is to change the reference phase of the Fresnel zone radii - a novel free parameter in the usual design of zone plate's lenses and antennas. To further improve the radiation characteristics of the hexagonal FZPL antenna, a technique involving Fresnel zone rotation is investigated. The book is of interest for designers of optical systems because taking scaling effects into account, the characteristics of diffractive quasioptical elements are valid for diffractive focusing elements of integrated optics.
Electronics and optics of solids --- Spectrometric and optical chemical analysis --- fysicochemie --- spectrometrie --- optica
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Photonic jets (PJs) are important mesoscale optical phenomena arising from electromagnetic waves interacting with dielectric particles. PJs have applications in super-resolution imaging, sensing, detection, patterning, trapping, manipulation, waveguiding, signal amplification and high-efficiency signal collection, among others. This reprint provides an overview of the field and highlights recent advances and trends in PJ research.
Research & information: general --- Physics --- photonic nanojet --- hemisphere --- microstructure --- interference --- standing wave --- reflection --- microsphere --- evanescent waves --- propagation --- whispering gallery modes --- super-resolution --- femtosecond laser processing --- photonics nanojet --- nanometer-scale pattern --- semiconductor materials --- super-resolution imaging --- dielectric superlens --- label-free imaging --- titanium dioxide --- spider silk --- dome lens --- photonic jet --- nanojet --- waveguide --- microlens --- fiber tip --- microspheres --- photonic nanojets --- optical trapping --- signal enhancement --- photonic hook --- patchy particles --- patchy particle --- optical switch --- Poynting vector --- vortex --- n/a
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Vibrations --- Optics. Quantum optics --- Electronics --- geluidsleer --- akoestiek --- photonics --- microwaves --- optica
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This book presents recent developments and new directions in advanced control systems, together with new theoretical findings, industrial applications and case studies on complex engineering systems, sensors, materials science, medicine, non-destructive testing and quality assurance. With a breakthrough in technology, the modern world is on the verge of new industrial revolution, at the stage of digital transformation when innovations from various industries collaborate and change each other. Innovations are the basis of the developed products and technologies. They are used to create new developments and advances as well as improve the state-of-the-art processes. However, the digital transformation both opens new opportunities and introduces additional risks. The successful industrial modernization is characterized by the combination of stable manufacturing regulatory structure with the new technological approaches of the Fourth Industrial Revolution. Developments and advances of School of Non-Destructive Testing relate to technological trends in the areas of systems, decision making and control in the fields of aerospace systems, robotics and automation, power systems and sensor networks.
Mathematics --- Electrical engineering --- Applied physical engineering --- Artificial intelligence. Robotics. Simulation. Graphics --- neuronale netwerken --- fuzzy logic --- cybernetica --- automatisering --- economie --- wiskunde --- KI (kunstmatige intelligentie) --- automatische regeltechniek --- AI (artificiële intelligentie)
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