Kernekemi, fotokemi og stråling

This book is a sequel of The Physics of Quantum Well Infrared Photodetectors (1997), which covered the basic physics of QWIPs. In the intervening 27 years, QWIP properties pertinent to infrared detection are much better understood, and QWIP technology has become a mainstream, widely deployed infrared technology. The main progress is the ability to know the QWIP absorption quantum efficiency quantitatively through rigorous electromagnetic modeling. The lack of theoretical prediction has impeded QWIP development for a long time. Generally, an arbitrary choice of detector structures yields substantial variations of absorption properties, and QWIP was regarded as a low quantum efficiency detector. With the advent of electromagnetic modeling, quantum efficiency of any detector geometry can be known exactly and be optimized to attain a large satisfactory value. Consequently, all properties of QWIPs are predictable, not unlike prevailing silicon devices. This unique characteristic enables QWIP to be the most manufacturable long wavelength infrared technology in mass production. This book by K K Choi, a co-inventor of QWIPs, will capture this exciting development.Based on the materials expounded in the book, the reader will know key performance metrics in infrared detection, in-depth knowledge of QWIP material and structural designs, array production, its application, and practical knowledge of electromagnetic modeling. In addition, the book will describe using micro- and nano-structures to enhance the emission properties of active and passive optical emitters, similar to detectors. The application of rigorous electromagnetic modeling to optical emitters is new to the optoelectronic community. The resonator-pixel emitter structure with its modeling method will no doubt be able to attract substantial academic and industrial attention in years to come.

This book describes various nonlinear phenomena in the radiation from plasmas, which are both fundamentally important because of the rich physics behind these phenomena, and also practically important as the most informative way to study laboratory and astrophysical plasmas is by analysing their radiation.

Combination Therapies Involving Photodynamic Therapy reviews the current state of development of PDT and presents the foreseeable advancements of combination approaches to therapeutic strategies.

The original idea that electromagnetic waves propagate in every direction with the same universal constant, the speed of light, corresponds with Maxwell's Theory of Electrodynamics in 1865. With the introduction of the Laser it became clear that it is also possible to emit a beam of light in one single direction while the speed of light in the directions perpendicular to the direction of propagation equals zero. In general, the laser frequencies are so high that the Laser radiation will not be harmful for the human brains and organs.Recent developments however demonstrate that it is very likely that Eastern countries like China and Russia are already doing experiments with Extreme Low Frequency (ELF) Masers. The fundamental principle on which Lasers and Masers are operating is the Phenomenon of Resonance. The fundamental Condition for Resonance is that the dimensions of the cavity are at least the dimension of the wave length. The wavelength of a frequency of 2.000 [Hz] equals 150 [km]. This means that to build an ELF Maser for a radio frequency of 2.000 [Hz] a resonance cavity is needed with the dimensions of at least 150 [km] which is about five times the size of New York.

This book explores the modification of various synthesis processes to enhance the photocatalytic activity in varied applications in the fields of environmental remediation and energy production. It outlines the enhancement of photocatalytic activity via alloys synthesis, thin film coatings, electro-spun nanofibers and 3D printed photocatalysts. The book further states the diverse applications of materials for degrading organic pollutants and airborne pathogens, improving indoor air quality and as a potential antimicrobial agent. The application of photocatalysts in green organic synthesis, biomedical field and in hydrogen evolution are also presented in the book. It covers theoretical studies of photocatalytic material and conversion of CO2 to value added chemical feed stocks. The book is of relevance to researchers in academia and industry alike in the fields of material science, environmental science & technology, photocatalytic applications andin energy generation and conversion.

This collection explores state-of-the-art methods and protocols for research on photodynamic therapy (PDT) and its use in a wide range of medical applications, from antiviral to anticancer. Beginning with an extensive section on in vitro and in vivo models, the volume continues with chapters on oxygen-independent photosensitizers, next-generation photosensitization strategies, contemporary insights into the immunomodulatory effects of PDT, antimicrobial effects of PDT, as well as a variety of general biochemical and molecular biological techniques. Written for the highly successful Methods in Molecular Biology series, chapters include the kind of detailed implementation advice that ensures successful results in the lab. Thorough and authoritative, Photodynamic Therapy: Methods and Protocols serves as an ideal source of inspiration for both new and established PDT scientists and a guide for designing innovative research programs in this continuously advancing and multidisciplinary field.

This book, the third in the series Behavior of Radionuclides in the Environment, is dedicated to Fukushima. Major findings from research since 2011 are reviewed concerning the behavior of radionuclides released into the environment due to the Fukushima Dai-ichi Nuclear Power Plant accident, including atmospheric transport and fallout of radionuclides, their fate, and transport in the soil-water environment, behavior in freshwater, coastal and marine environment, transfer in the terrestrial and agricultural environment. Volume III discusses not only radionuclides dynamics in the environment in the short- and mid-term, but also modeling and prediction of long-term time changes.Along with reviews, the book contains original data and results not published previously. It was spearheaded by the authors from the Institute of Environmental Radioactivity at Fukushima University, established two years after the Fukushima accident, with their collaborators from Japan, Russia, and Ukraine. The knowledge emerging from the studies of the environmental behavior of Fukushima-derived radionuclides enables us to move forward in understanding mechanisms of environmental contamination and leads to better modeling and prediction of long-term pollution effects in general. 

This work highlights recent advances in the study of rare earth elements and actinides, both of which are critical to nuclear waste challenges, through molecular and data drive modeling.

Synchrotron radiation is the name given to the radiation which occurs when charged particles are accelerated in a curved path or orbit. Classically, any charged particle which moves in a curved path or is accelerated in a straight-line path will emit electromagnetic radiation. Various names are given to this radiation in different contexts. Thus circular particle accelerators are called synchrotrons, this is where charged particles are accelerated to very high speeds and the radiation is referred to as synchrotron radiation. Suitable for a summer short course or one term lecture series this text introduces the subject, starting with some historical background then covering basic concepts such as flux, intensity, brilliance, emittance and Liouville's theorem. The book then covers the properties of synchrotron radiation, insertion devices, beamlines and monochromators before finishing with an introduction to free electron lasers and an overview of the most common techniques and applications of this technology.

This book is an introduction to the concept of symmetries in electromagnetism and explicit symmetry breaking. It begins with a brief background on the origin of the concept of symmetry and its meaning in fields such as architecture, mathematics and physics. Despite the extensive developments of symmetry in these fields, it has yet to be applied to the context of classical electromagnetism and related engineering applications. This book unravels the beauty and excitement of this area to scientists and engineers.

The development of nuclear weapons by the Manhattan Project during World War II was one of the most dramatic scientific/technological episodes in human history. This book, prepared by a recognized expert on the Manhattan Project, offers a concise survey of the essential physics concepts underlying fission weapons. The text describes the energetics and timescales of fast-neutron chain reactions, why only certain isotopes of uranium and plutonium are suitable for use in fission weapons, how critical mass and bomb yield can be estimated, how the efficiency of nuclear weapons can be enhanced, how the fissile forms of uranium and plutonium were obtained, some of the design details of the 'Little Boy' and 'Fat Man' bombs, and some of the thermal, shock, and radiation effects of nuclear weapons. Calculation exercises are provided, and a Bibliography lists authoritative print and online sources of information for readers who wish to pursue more detailed study of this fascinating topic.

This book is a rigorous but concise macroscopic description of the interaction between electromagnetic radiation and structures containing graphene sheets (two-dimensional structures). It presents canonical problems with translational invariant geometries, in which the solution of the original vectorial problem can be reduced to the treatment of two scalar problems, corresponding to two basic polarization modes. The book includes computational problems and makes use of the Python programming language to make numerical calculations accessible to any science student. Many figures within are accompanied by Python scripts.

Optical properties, particularly in the infrared range of wavelengths, continue to be of enormous interest to both material scientists and device engineers. The need for the development of standards for data of optical properties in the infrared range of wavelengths is very timely considering the on-going transition of nano-technology from fundamental R&D to manufacturing. Radiative properties play a critical role in the processing, process control and manufacturing of semiconductor materials, devices, circuits and systems. The design and implementation of real-time process control methods in manufacturing requires the knowledge of the radiative properties of materials. Sensors and imagers operate on the basis of the radiative properties of materials. This book reviews the optical properties of various semiconductors in the infrared range of wavelengths. Theoretical and experimental studies of the radiative properties of semiconductors are presented. Previous studies, potential applications and future developments are outlined. In Chapter 1, an introduction to the radiative properties is presented. Examples of instrumentation for measurements of the radiative properties is described in Chapter 2. In Chapters 3-11, case studies of the radiative properties of several semiconductors are elucidated. The modeling and applications of these properties are explained in Chapters 12 and 13, respectively. In Chapter 14, examples of the global infrastructure for these measurements are illustrated.

Lors de sa récente visite en Amérique, madame Curie a conféré un honneur spécial au Collège Vassar en livrant, à la chapelle, le soir du 14 mai, la seule longue allocution qu'elle a prononcée dans ce pays. D'une manière simple et directe, elle a raconté l'histoire de sa grande réussite. Les gens ont pu comprendre comment, entourée de toutes les grandes réalités de l'expérience humaine, face à d'énormes difficultés et avec des ressources limitées, elle avait poursuivi sans relâche sa recherche de la vérité. /// IN HER recent visit to America, Mrs Curie conferred a special honor upon Vassar College by delivering in the chapel on the evening of May fourteenth the only extended address which she made in this country. In a simple, straightforward way she told the story of her great achievement. One realized how, closely environed by all the great realities of human experience, in the face of tremendous difficulties and with limited resources, she had pursued undaunted her search for truth.

A comprehensive and accessible guide to understanding how radiation affects our everyday livesNuclear energy, X-rays, radon, cell phones . . . radiation is part of the way we live on a daily basis, and yet the sources and repercussions of our exposure to it remain mysterious. Now Pulitzer Prize-winning journalist Wayne Biddle offers a first-of-its-kind guide to understanding this fundamental aspect of the universe. From fallout to radiation poisoning, alpha particles to cosmic rays, Biddle illuminates the history, meaning, and health implications of one hundred scientific terms in succinct, witty essays. A Field Guide to Radiation is an essential, engaging handbook that offers wisdom and common sense for today's increasingly nuclear world.