Conferences related to Absorption

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2019 URSI International Symposium Symposium on Electromagnetic Theory (EMTS)

The interest of Commission B is fields and waves, encompassing theory, analysis, computation, experiments, validation and applications. Areas of emphasis are 1) Time-domain and frequency-domain phenomena, 2) Scattering and diffraction, 3) General propagation including waves in specialised media, 4) Guided waves, 5) Antennas and radiation, and 6) Inverse scattering and imaging.The Commission fosters the creation, development, and refinement of analytical, numerical, and measurement techniques to understand these phenomena. It encourages innovation and seeks to apply interdisciplinary concepts and methods.


2018 22nd International Microwave and Radar Conference (MIKON)

Antenna Design, Modeling & MeasurementsMicrowave Devices, Circuits & ComponentsMillimeter-wave & Terahertz TechnologyMicrowave Photonics, Circuits & SystemsRF, VHF & UHF TechnologyEM Field Theory & Numerical TechniquesMicrowave MeasurementsIndustrial, Scientific and Medical ApplicationsWireless Technology & ApplicationsElectromagnetic CompatibilitySpace & Satellite SystemsRadar TechnologyRadar Systems & ApplicationsRadar Signal ProcessingTracking & Data FusionRadar Imaging & Remote SensingNoise, MIMO & UWB RadarsMultistatic & Passive Radar Systems


2017 17th European Conference on Radiation and Its Effects on Components and Systems (RADECS)

The RADECS international conference is held once a year in Europe, covering the latest progress in the field of radiation effects on electronics, optoelectronics devices and systems and their behaviou and reliability under ionizing high energy radiation. This conference aims at bringing together scientists and industry from space, aviation, ground applications and accelerators and at the same time industrial exhibitors, together initiating contracts, collaborations and paving the way to tomorrow’s requirements. This year’s conference is organized by CERN (European Laboratory for Nuclear Research). The first day of the conference will be covered by a short course entitled “From Space, To Ground and Below”, to introduce how to deal with radiation effects within different environments such as Space, Avionic, Ground Level and Particle accelerators. The technical program will then feature oral and poster technical sessions, a data workshop and an industrial exhibition.


2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS)

The world's premiere conference in MEMS sensors, actuators and integrated micro and nano systems welcomes you to attend this four-day event showcasing major technological, scientific and commercial breakthroughs in mechanical, optical, chemical and biological devices and systems using micro and nanotechnology. The major areas of activity in the development of Transducers solicited and expected at this conference include but are not limited to: Bio, Medical, Chemical, and Micro Total Analysis Systems, Fabrication and Packaging, Mechanical and Physical Sensors, Materials and Characterization, Design, Simulation and Theory, Actuators, Optical MEMS, RF MEMS, Nanotechnology, Energy and Power


2017 19th International Conference on Transparent Optical Networks (ICTON)

ICTON addresses applications of transparent and all optical technologies in telecommunication networks, systems, and components. ICTON topics are well balanced between basic optics and network engineering. Interactions between those two groups of professionals are a valuable merit of conference. ICTON combines high level invited talks with carefully selected regular submissions.


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Periodicals related to Absorption

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Antennas and Propagation, IEEE Transactions on

Experimental and theoretical advances in antennas including design and development, and in the propagation of electromagnetic waves including scattering, diffraction and interaction with continuous media; and applications pertinent to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques.


Antennas and Wireless Propagation Letters, IEEE

IEEE Antennas and Wireless Propagation Letters (AWP Letters) will be devoted to the rapid electronic publication of short manuscripts in the technical areas of Antennas and Wireless Propagation.


Applied Superconductivity, IEEE Transactions on

Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission


Biomedical Circuits and Systems, IEEE Transactions on

The Transactions on Biomedical Circuits and Systems addresses areas at the crossroads of Circuits and Systems and Life Sciences. The main emphasis is on microelectronic issues in a wide range of applications found in life sciences, physical sciences and engineering. The primary goal of the journal is to bridge the unique scientific and technical activities of the Circuits and Systems ...


Biomedical Engineering, IEEE Transactions on

Broad coverage of concepts and methods of the physical and engineering sciences applied in biology and medicine, ranging from formalized mathematical theory through experimental science and technological development to practical clinical applications.


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Xplore Articles related to Absorption

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Optical parametric generation in the presence of strong two-photon absorption in periodically-poled LiNbO<sub>3</sub>

X. Mu; Y. J. Ding The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

Optical parametric oscillation (OPO) and optical parametric generation (OPG) have widely been used for producing tunable radiations. In this paper we present our results on the OPG pumped by a nanosecond 532-nm beam in a PPLN crystal. We have measured the OPG conversion efficiency for different repetition rates. In addition, we have also measured the transmittance of the pump beam ...


Low bias, low noise single-avalanche-stage APDs

Y. Gu; F. S. Choa The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

Avalanche photodiodes (APDs) are attractive for use in large capacity long distance optical communication systems. They provide an advantage over p-i-n detectors because of their internal gains. A gain-bandwidth product of ∼300 GHz has been achievable using an APD with a <100 nm thick multiplication layer. Avalanche multiplication based on impact ionization is a noisy process intrinsically. In a conventional ...


VIPA spectrometer for accurate and sensitive self-referenced frequency comb spectroscopy

Grzegorz Kowzan; Kevin F. Lee; Magdalena Paradowska; Mateusz Borkowski; Piotr Ablewski; Szymon Wójtewicz; Kamila Stec; Daniel Lisak; M. E. Fermann; Ryszard S. Trawiński; Piotr Masłowski 2016 Conference on Lasers and Electro-Optics (CLEO), 2016

We perform cavity-enhanced direct frequency comb spectroscopy with a self- referenced VIPA spectrometer. We compare PDH and dither cavity stabilization in near-IR measurements of carbon monoxide and measure absorption sensitivities of 9.9×10-10 and 5.3×10-9 cm-1 respectively.


Air Mass Factor Calculations Based on Support Vector Regression Machine

Dong Han; Liangfu Chen; Guojiang Chen; Zifeng Wang; Shenshen Li 2009 Second International Conference on Environmental and Computer Science, 2009

Nitrogen dioxide (NO2) plays a key role in the chemistry of the atmosphere. Based on the space borne measurements, the Differential Optical Absorption Spectroscopy (DOAS) method determines the NO2 slant column density (SCD) along the light path through the atmosphere in a given spectral window between 405 and 465 nm. Based on radiative transfer model, a Look-Up-Table (LUT) of Air ...


Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz

Baoshan Zhang; Yong Feng; Jie Xiong; Yi Yang; Huaixian Lu IEEE Transactions on Magnetics, 2006

We have investigated the microwave-absorbing properties for different shapes and aggregated states of carbonyl-iron particles dispersed in epoxy resin matrix at various volume concentrations. Here, we discuss the requirements of lower reflection coefficient for the microwave permittivity εr=ε'-jε'' and permeability μr=μ'-jμ''. Compared to the aggregated sphere-shaped particles (SS), the de-aggregated flake-shaped carbonyl iron particles (FS) have higher permeability, lower permittivity, ...


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Educational Resources on Absorption

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eLearning

Optical parametric generation in the presence of strong two-photon absorption in periodically-poled LiNbO<sub>3</sub>

X. Mu; Y. J. Ding The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

Optical parametric oscillation (OPO) and optical parametric generation (OPG) have widely been used for producing tunable radiations. In this paper we present our results on the OPG pumped by a nanosecond 532-nm beam in a PPLN crystal. We have measured the OPG conversion efficiency for different repetition rates. In addition, we have also measured the transmittance of the pump beam ...


Low bias, low noise single-avalanche-stage APDs

Y. Gu; F. S. Choa The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003

Avalanche photodiodes (APDs) are attractive for use in large capacity long distance optical communication systems. They provide an advantage over p-i-n detectors because of their internal gains. A gain-bandwidth product of ∼300 GHz has been achievable using an APD with a <100 nm thick multiplication layer. Avalanche multiplication based on impact ionization is a noisy process intrinsically. In a conventional ...


VIPA spectrometer for accurate and sensitive self-referenced frequency comb spectroscopy

Grzegorz Kowzan; Kevin F. Lee; Magdalena Paradowska; Mateusz Borkowski; Piotr Ablewski; Szymon Wójtewicz; Kamila Stec; Daniel Lisak; M. E. Fermann; Ryszard S. Trawiński; Piotr Masłowski 2016 Conference on Lasers and Electro-Optics (CLEO), 2016

We perform cavity-enhanced direct frequency comb spectroscopy with a self- referenced VIPA spectrometer. We compare PDH and dither cavity stabilization in near-IR measurements of carbon monoxide and measure absorption sensitivities of 9.9×10-10 and 5.3×10-9 cm-1 respectively.


Air Mass Factor Calculations Based on Support Vector Regression Machine

Dong Han; Liangfu Chen; Guojiang Chen; Zifeng Wang; Shenshen Li 2009 Second International Conference on Environmental and Computer Science, 2009

Nitrogen dioxide (NO2) plays a key role in the chemistry of the atmosphere. Based on the space borne measurements, the Differential Optical Absorption Spectroscopy (DOAS) method determines the NO2 slant column density (SCD) along the light path through the atmosphere in a given spectral window between 405 and 465 nm. Based on radiative transfer model, a Look-Up-Table (LUT) of Air ...


Microwave-absorbing properties of de-aggregated flake-shaped carbonyl-iron particle composites at 2-18 GHz

Baoshan Zhang; Yong Feng; Jie Xiong; Yi Yang; Huaixian Lu IEEE Transactions on Magnetics, 2006

We have investigated the microwave-absorbing properties for different shapes and aggregated states of carbonyl-iron particles dispersed in epoxy resin matrix at various volume concentrations. Here, we discuss the requirements of lower reflection coefficient for the microwave permittivity εr=ε'-jε'' and permeability μr=μ'-jμ''. Compared to the aggregated sphere-shaped particles (SS), the de-aggregated flake-shaped carbonyl iron particles (FS) have higher permeability, lower permittivity, ...


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IEEE-USA E-Books

  • Spheres

    Scattering of a plane electromagnetic wave by a spherical object is perhaps the important canonical problem in electromagnetic scattering theory. The sphere serves as a model of a compact smooth scatterer and is one of only two compact geometries for which Maxwell's equations can be solved in an explicit form. An exact solution is available not only for perfectly electrically conducting (PEC) but also for material, homogeneous or radially stratified, magneto‐dielectric spheres. This chapter addresses the physical interpretation of scattering from spheres, depending on the electrical size and the degree of absorption in the material of the sphere. It applies the general solution for the far scattered field to the particular cases of two concentric spheres and their variants, including PEC, impedance, and core‐shell spheres, and describes the most important features of low‐ and high‐frequency scattering from these structures.

  • Regulations Related to Antenna Engineers

    There are three regulations which are of relevance to antenna engineers. The specific absorption rate (SAR) regulates the maximum power density inside human bodies when a phone is used. The hearing aid compatibility (HAC) regulates the maximum value of the electric (E) and magnetic (H) fields, which can interfere with the proper functionality of a hearing aid, around a phone's speaker. The electromagnetic interference (EMI) or EM compatibility (EMC) regulates the maximum E field that can radiate into the surrounding environment. As the dielectric properties are variables of temperature, the ambient temperature and also the tissue¿¿¿simulating liquid temperature need to be well controlled within a certain range. Beside cellular bands, SAR of Wi¿¿¿Fi bands (2.4 and/or 5¿¿¿GHz) are also required. The goal of SAR measurement is to find the maximum value, which is averaged over either 1 or 10¿¿¿g volume depending on different standards, inside the phantom head.

  • Optical Light Sources and Drains

    Regarding optical communication engineering and fiber sensor techniques, semiconductor devices are predominantly used as light sources and light drains. Relating to semiconductor light sources and drains, generation and absorption of light can be demonstrated by means of the energy‐band model in semiconductors. Concerning the used light sources for optical communication and sensor techniques, light emitting diodes (LEDs) and semiconductor lasers are primarily applied. The cleaved‐coupled cavity laser consists of two coupled active resonators being adjusted by the injection current. The distributed Bragg reflection laser eliminates the Fabry‐Perot reflection at the ends of the laser by means of two grating reflectors outside the active layer. In general, photodiodes are operated in a reverse biased direction. Photons, which possess a higher energy than the band gap, are able to generate electron‐hole pairs in semiconductor materials. The types of photodiodes are PIN photodiode and avalanche photodiode.

  • Optical Receivers

    The definitive guide to fiber-optic communicationsystems, now fully up-to-date since the release of the previous edition of this proven bestseller, fiber- optic communication systems (FOCS) have revolutionized the telecommunications industry and, due to advantages over electrical transmission, have largely replaced copper wire communications. Now, the Fourth Edition continues this trusted resource's tradition of providing the most comprehensive FOCS coverage by incorporating the recent advances in the field, emphasizing both the physical understanding and engineering aspects. Featured are two new chapters: one deals with the advanced modulation formats (such as DPSK, QPSK, and QAM) that are increasingly being used for improving spectral efficiency of WDM lightwave systems; the other focuses on new techniques such as all-optical regeneration that are under development and likely to be used in future communication systems. All other chapters have been updated, and mater al has been restructured to be better suited for a two-semester course on optical communications. Students and researchers alike will benefit from the extensive pedagogical aids, including: * Extensive reference lists for each chapter * A survey of recent research material for each topic * Relevant end-of-chapter practice problems for instructors and students * A Solutions Manual available to instructors on request * State-of-the-art software on the enclosed CD, which students can use to design point-to-point optical links, as well as additional problems for each chapter Used worldwide as a textbook in many universities, Fiber-Optic Communication Systems is intended primarily for graduate students of fiber-optic communications. It is also a valuable resource for undergraduate courses at the senior level, as well as an indispensable professional reference for engineers and technicia s in the telecommunications industry and scientists working in the fields of fiber optics and optical communications.

  • FSO in HAP&#x2010;Based Communication Systems

    In this book, the authors provide a thorough overview of the state of the art in high-altitude platform (HAP) enabling technologies, addressing recent research activities and results. In addition, the book explores the enabling technologies and economics of HAP-based communication systems, including issues related to aeronautics, applications and business modelling, as well as future trends. Furthermore, the authors discuss broadband wireless communications from HAPs, the operating environment, and advanced communication techniques for efficient radio link resource management. Similarly, the authors complement radio frequency (RF) dominated issues with free space optical communications in the HAP operating environment, focusing on physical and networking layers. Finally, the book addresses the multiple HAP constellations planning procedure and discusses the networking implications of using multiple HAPs. **Key Features:** * Focuses on placing HAPs in the perspective o current and future broadband wireless communication systems * Offers an overview of the constraints affecting HAP-based broadband communications * Provides a thorough overview and state of the art of the HAP enabling technologies, including recent research activities and future directions * Examines the operating environment, advanced communication techniques for efficient radio link resource management, and suitable antennas * Addresses multiplatform constellations, presenting the multiple HAP constellation planning procedure and discussing the networking implications of using multiple HAPs This book will be of valuable interest to researchers and practitioners in the areas of wireless communications, satellite communications and high-altitude platforms, and development engineers involved in the design and development of HAP systems.

  • De&#x2010;Reverberation

    This chapter contains sections titled: Reverberation and Modeling De‐reverberation via De‐convolution De‐reverberation via Suppression De‐reverberation with Multiple Microphones Practical Recommendations Summary Bibliography

  • Transmission Impairments

    This chapter contains sections titled: Radiowave Frequency and Space Communications Radiowave Propagation Mechanisms Propagation Below About 3 GHz Propagation Above About 3 GHz Radio Noise References Problems

  • Far&#x2010;field Scattering

    Most practical applications of electromagnetic scattering (e.g., radar or remote sensing) involve targets that are located very far from the transmitter and receiver. At such distances the target appears to be a point scatterer and the scattered field at the receiver position looks like a spherical wave emanating from the scatterer. This chapter describes parameters such as various scattering cross sections, the scattering matrix, and the far‐field coefficient that characterize scattering from distant targets. It presents mathematical conditions for the distance to the far‐field region and derives integral representations of the far field in terms of equivalent currents. Furthermore, the forward‐scattering (optical) theorem which helps to determine the losses of energy in the incident wave due to scattering and absorption is derived. The chapter concludes with an overview of different scattering regimes, like low‐frequency, resonant, and high‐frequency, observed in the far‐field region of scatterers of various electrical sizes.

  • Scattering of Waves by Conducting and Dielectric Objects

    In radar, the radio wave is transmitted toward an object and the scattered wave received by an antenna reveals the characteristics of the object, such as its position and motion. This chapter develops basic formulations of the scattering problem, discusses possible potential applications. When an object is illuminated by a wave, a part of the incident power is scattered out and another part is absorbed by the object. The characteristics of these two phenomena, scattering and absorption, can be expressed by assuming an incident plane wave. The chapter discusses the scattering characteristics of a conducting body, particularly the backscattering cross section for radar applications. It presents an overall view of how these cross sections are related to the geometric cross section, wavelength, and dielectric constant. The chapter describes the physical optics approximation to give a convenient expression for the surface current, and thus it is widely used for many applications.

  • L¿¿vy Flight of Photoexcited Minority Carriers in Moderately Doped Semiconductors: Theory and Observation

    This chapter contains sections titled: * Introduction * Anomalous Diffusion of the Minority Carriers * Single Step Probability Distribution * Distribution Along a Band: Boundary Effects * Experimental Luminescence Spectra and Observation of the L¿¿vy Flight Distribution of the Minority Carriers * A Single Big Jump Approximation for the Truncated L¿¿vy Flight * Conclusions



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