Download or read book Design and Implementation of Vo2 based Tunable Windows and Microelectromechanical Optical Shutters for Emissivity Modulation written by Jose Luis Figueroa-Soto and published by . This book was released on 2021 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the programmability of emissivity states in a monolithically integrated micro window based on vanadium dioxide (VO2) thin films. The 400Îơm window features a VO2 thin film with integrated electrodes for actuation and sensing. The phase transition was induced by resistive heating, while the electrical resistivity and optical transmittance (for near IR wavelength of 1550 nm) of the VO2 thin film were monitored simultaneously. Abrupt drops in electrical resistance and optical transmittance confirmed the quality of the VO2 thin films. Electronic pulses were used to program emissivity states in the VO2 window. The emissivity programmed state was shown for a specific DC current over imposed with the programming pulse; but any emissivity state that belongs to the minor hysteretic curves can be obtained by choosing different electronic inputs. The fully monolithically integrated device presented here can be used for IR cloaking applications, where different emissivity values can be programmed with electronic pulses.Micrometer-sized VO2-based devices with integrated resistive heaters of different configurations were fabricated. Quality of the VO2 films was confirmed by measuring the characteristic drop in transmittance and negative differential emissivity for these films. A two-interface model for optical transmittance, reflectance, and absorbance is presented. This method and analytic model presents an advantage over most typically used approaches in that it does not require direct measurements of the material's optical constants to estimate transmittance. By combining the substrate and the VO2 film into one layer with a reduced optical admittance, the two-interface model was reduced to a single-layer model. Moreover, the present work demonstrates the implementation of the developed VO2-based devices in adaptive camouflage and shape-converting applications. Electrical pulses are used to program different emissivity states to convert geometric shapes inside a fully integrated VO2-basedelectro-optical window. This resulted in the reconfiguring of thermal images to either create new shapes, or shift from one to another.A transient heat deflection model is developed which can be applied for any bimorph structure actuated electro-thermally and for which the dimensions and material properties are known. Micrometer size VO2 based cantilevers with integrated resistive heaters are fabricated and deflections due to an input of current are recorded using a high-speed camera. From the high frame rate videos, deflection measurements and dynamic response is extracted and compared to numerical data obtained from the model. The transient heat as caused by the current input is studied, and a model is developed.VO2-based MEMS tunable optical attenuators are demonstrated. The design consists of a VO2-based cantilever attached to a VO2-based optical window with integrated resistive heaters for individual mechanical actuation of the cantilever structure, tuning of the optical properties of the window, or both. Optical transmittance measurements as a function of current for both heaters demonstrates that the developed devices can be used as analog optical attenuators, where the intensity of a light beam can be tuned to any value within the range of VO2 phase transition. A transmittance drop off 30% is shown for the optical window, with tuning capabilities greater than 30% upon actuation of the cantilever. Unlike typical mechanical attenuators, these devices are not restricted to binary optical states. Optical modulation of the optical window is demonstrated with an oscillating electrical input. This produces a transmittance signal that oscillates around an average value within the range off VO2's phase transition. For an input current signal with fixed amplitude (fel= 0.28Hz), tuned to be at the onset of the phase transition, a transmittance modulation of 14% is shown. Similarly, by modulating the DC-offset, a transmittance modulation of VO2 along the hysteresis is obtained.
Download or read book Metamaterials and Metasurfaces written by Josep Canet-Ferrer and published by BoD – Books on Demand. This book was released on 2019-01-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Metamaterials have provided applications in spectral ranges covering radio frequencies and ultraviolet. However, most applications have been extrapolated to the visible or near-infrared after being developed at the GHz level. This is due to technological reasons since fabrication of microwave antennas is not as demanding as THz resonators or plasmonic nanostructures. Accordingly, this book has been divided into three parts. In the first part, fundamentals of metamaterials and metadevices are discussed, while describing recent advances in the field. In the second part, the discussion is extended to the different spectral ranges focusing on the strategies for enabling the reconfigurability of metadevices. Given the increasing interest in THz applications, these can be found in the third part.
Download or read book Micro and Smart Systems written by G. K. Ananthasuresh and published by Wiley Global Education. This book was released on 2012-04-13 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microsystems are systems that integrate, on a chip or a package, one or more of many different categories of microdevices. As the past few decades were dominated by the development and rapid miniaturization of circuitry, the current and coming decades are witnessing a similar revolution in the miniaturization of sensors, actuators, and electronics; and communication, control and power devices. Applications ranging from biomedicine to warfare are driving rapid innovation and growth in the field, which is pushing this topic into graduate and undergraduate curricula in electrical, mechanical, and biomedical engineering.
Download or read book Springer Handbook of Glass written by J. David Musgraves and published by Springer. This book was released on 2019-08-14 with total page 1590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook provides comprehensive treatment of the current state of glass science from the leading experts in the field. Opening with an enlightening contribution on the history of glass, the volume is then divided into eight parts. The first part covers fundamental properties, from the current understanding of the thermodynamics of the amorphous state, kinetics, and linear and nonlinear optical properties through colors, photosensitivity, and chemical durability. The second part provides dedicated chapters on each individual glass type, covering traditional systems like silicates and other oxide systems, as well as novel hybrid amorphous materials and spin glasses. The third part features detailed descriptions of modern characterization techniques for understanding this complex state of matter. The fourth part covers modeling, from first-principles calculations through molecular dynamics simulations, and statistical modeling. The fifth part presents a range of laboratory and industrial glass processing methods. The remaining parts cover a wide and representative range of applications areas from optics and photonics through environment, energy, architecture, and sensing. Written by the leading international experts in the field, the Springer Handbook of Glass represents an invaluable resource for graduate students through academic and industry researchers working in photonics, optoelectronics, materials science, energy, architecture, and more.
Download or read book Uncooled Infrared Imaging Arrays and Systems written by and published by Academic Press. This book was released on 1997-11-24 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first book to describe an emerging but already growing technology of thermal imaging based on uncooled infrared imaging arrays and systems, which are the most exciting new developments in infrared technology today. This technology is of great importance to developers and users of thermal images for military and commercial applications. The chapters, prepared by world leaders in the technology, describe not only the mainstream efforts, but also exciting new approaches and fundamental limits applicable to all. - Unified approach to technology development based on fundamental limits - Individual chapters written by world leaders in each technology - Novel potential approaches, allowing for the reduction of costs, described in detail - Descriptive and analytical - Provides details of the mainstream approaches--resistive bolometric, pyroelectric/field enhanced pyroelectric, thermoelectric - Provides insight into a unified approach to development of all types of thermal imaging arrays Features state-of-the-art and selected new developments
Download or read book Nanotechnology in Construction written by Peter J M Bartos and published by Royal Society of Chemistry. This book was released on 2007-10-31 with total page 397 pages. Available in PDF, EPUB and Kindle. Book excerpt: The importance of nanotechnology related research and development has become recognised worldwide. Substantial public and private investment is now being ploughed into research and development in a number of industrial sectors, where nanotechnology has become established and has led to new commercial products. The construction industry, having major economic significance with nano-scale research and development which is only emerging, offers a wide scope for exploitation of nanotechnology. With international contributions from experts in the field, Nanotechnology in Construction amalgamates previously fragmented research and emerging trends. It reflects the inherent multi-disciplinary nature of nano-scale research in construction and contributions cover a wide spectrum, from highly scientific investigations to futuristic applications. The book is organised into four broad sections, the first reviews and analyses the prospects of exploitation of nanotechnology in construction, the second discusses novel tools and their capabilities, the final two sections show existing significant products where nanotechnology has been already been exploited or where product development is under-way. Nanotechnology in Construction will appeal to researchers already working in this field as well as those wishing to enter it. It will also inform governmental and other funding agencies of the most promising future directions and their related timescales. Practical applications are considered and explanations of the underlying basics are given, raising awareness and understanding of what nanotechnology can offer to construction professionals in general.
Download or read book Smart Architecture A Sustainable Approach for Transparent Building Components Design written by Valentina Frighi and published by Springer Nature. This book was released on 2021-08-25 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the specific role that glazing technologies play within the world of smart architecture as important components of contemporary and future sustainable architectural and technological research. Smart Architecture begins with a definition of the concept of “smart” in architecture and examines how innovative technologies and materials have shaped buildings over the years. The author then provides a supporting database of contemporary smart architecture—mapping adopted strategies, recognizing common patterns, and evaluating current and future trends in the context of smart building envelopes, energy efficiency, and the development of high-potential innovative building components. The book proceeds with a focus on the specific role that glazing technologies play in this framework and provides a systematic methodology to quantify options for the effective integration of transparent building components within advanced and innovative building envelope systems.
Download or read book Self Adjustability written by James Thomas Searcy and published by . This book was released on 1895 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Schott Guide to Glass written by H.G. Pfaender and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accessible and generously illustrated in full colour, this reference spans the history of glass, the raw materials and the manufacturing process, as well as its many products. Informative and compact, this convenient guide is appropriate for anyone interested in glass. Revised throughout for this new edition.
Download or read book Metal Insulator Transitions written by Nevill Mott and published by CRC Press. This book was released on 2004-01-14 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a second edition of a classic book. Written by the late, great Sir Nevill Mott (Britain's last Nobel Prize winner for Physics), Metal Insulator Transitions has been greatly updated and expanded to further enhance its already enviable reputation.
Download or read book Smart Biomaterials written by Mitsuhiro Ebara and published by Springer. This book was released on 2014-05-28 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides comprehensive coverage of smart biomaterials and their potential applications, a field that is developing at a very rapid pace. Because smart biomaterials are an emerging class of biomaterials that respond to small changes in external stimuli with large discontinuous changes in their physical properties, they have been designed to act as an “on–off” switch for, among others, bio separation, immunoanalysis, drug delivery technologies, gene therapy, diagnostics, bio sensors and artificial muscles. After an introduction to the topic and the history of smart biomaterials, the author gives the reader an in-depth look at the properties, mechanics, and characterization of smart biomaterials including hydrogels, particles, assemblies, surfaces, fibers and conjugates. Information on the wide range of applications for these materials follows, including drug delivery, tissue engineering, diagnostics, biosensors, bio separation and actuators. In addition, recent advances in shape memory biomaterials as active components of medical devices are also presented.
Download or read book The Industrial Electronics Handbook Second Edition Five Volume Set written by Bogdan M. Wilamowski and published by CRC Press. This book was released on 2011-03-04 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industrial electronics systems govern so many different functions that vary in complexity—from the operation of relatively simple applications, such as electric motors, to that of more complicated machines and systems, including robots and entire fabrication processes. The Industrial Electronics Handbook, Second Edition combines traditional and newer, more specialized knowledge that will help industrial electronics engineers develop practical solutions for the design and implementation of modern industrial systems. Embracing the broad technological scope of the field, this collection explores fundamental areas, including analog and digital circuits, electronics, electromagnetic machines, and signal processing. It also facilitates the use of intelligent systems—such as neural networks, fuzzy systems, and evolutionary methods—in terms of a hierarchical structure that makes factory control and supervision more efficient by addressing the needs of all production components. Assembling the world’s leading researchers to cover key aspects of this branch of science, the handbook includes the following volumes, which are available individually or as a complete set: Fundamentals of Industrial Electronics Power Electronics and Motor Drives Control and Mechatronics Industrial Communication Systems Intelligent Systems To help readers deal with myriad physical phenomena—and the sensors used to measure them—the handbook re-evaluates the importance of electronic circuits. It goes beyond their value as an end product and focuses on their importance as building blocks in larger systems. Taking into account the relative complexity of most fabrication processes, contributors simplify the development and application of communication systems that can be tailored for specific industrial environments to link the various elements of each. Enhancing its value, this fully updated collection presents research and global trends as published in the IEEE Transactions on Industrial Electronics Journal, one of the largest and most respected publications in the field.
Download or read book Infrared Detectors and Emitters Materials and Devices written by Peter Capper and published by Springer Science & Business Media. This book was released on 2013-11-27 with total page 500 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date view of the various detector/emitter materials systems currently in use or being actively researched. The book is aimed at newcomers and those already working in the IR industry. It provides both an introductory text and a valuable overview of the entire field.
Download or read book Least Tern written by and published by . This book was released on 1994 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Metal Amide Chemistry written by Michael Lappert and published by John Wiley & Sons. This book was released on 2008-12-23 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by internationally recognised leaders in the field, Metal Amide Chemistry is the authoritative survey of this important class of compounds, the first since Lappert and Power’s 1980 book “Metal and Metalloid Amides.” An introduction to the topic is followed by in-depth discussions of the amide compounds of: alkali metals alkaline earth metals zinc, cadmium and mercury the transition metals group 3 and lanthanide metals group 13 metals silicon and the group 14 metals group 15 metals the actinide metals Accompanied by a substantial bibliography, this is an essential guide for researchers and advanced students in academia and research working in synthetic organometallic, organic and inorganic chemistry, materials chemistry and catalysis.
Download or read book Nanophotonic Materials written by Ralf B. Wehrspohn and published by John Wiley & Sons. This book was released on 2008-09-08 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: `Nanophotonic Materials - Photonic Crystals, Plasmonics, and Metamaterials' summarizes the work and results of a consortium consisting of more than 20 German research groups concentrated on photonics crystals research over the last seven years. Illustrated throughout in full color, the book provides an overview of these novel materials, spanning the entire range from fundamentals to applications.
Download or read book Responsive Polymer Materials written by Sergiy Minko and published by Wiley-Blackwell. This book was released on 2006-01-18 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new book offers practical insights into the latest developments in responsive polymers, i.e., polymers engineered to alter structure and properties in response to environmental inputs. The book features original design, methodological, and application data. Chemists, biochemists, and electronic engineers will find here important new material to understand and characterize molecular and submolecular assemblies that enable the fabrication of switch-driven polymer systems. Beginning from basic research and moving to single-molecular design, the contributors illuminate switching in self-assembled aggregates of polymer chains. These analyses are extended to the switching/changing of macroscopic properties in bulk and thin films. The book demonstrates how the properties of responsive polymers such as morphology, wetting behavior, adhesion, roughness, permeability etc., can be modified to create and improve biomedical devices, chemical sensors, microfluidic devices, drug delivery systems, adhesion systems, and self-regulating colloids. For specialists investigating the potential of molecular and submolecular polymer design, this book is essential.
