Materials Literature
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Photoreceptors are a class of sensory neuronal cells that are deleteriously affected in many disorders and injuries of the visual system. Significant injury or loss of these cells often results in a partial or complete loss of vision. While previous studies have determined many necessary components of the gene regulat…
In this chapter, we recall some basic facts from Fourier analysis which we need for our approach to diffraction theory in Chapter 9. Since Fourier series and their generalisations to almost periodic functions occur only occasionally below, we keep their exposition brief and informal (mostly without proofs, but with pr…
Mathematical diffraction theory is concerned with the precise measure-theoretic formulation of kinematic diffraction in the classic Fraunhofer picture [Cow95, Hof95a]. In this setting, the diffraction measure is given by the Fourier transform of the autocorrelation of the initial structure. The corresponding inverse p…
The result on the pure point diffraction of crystallographic systems and. more generally, of regular model sets is constructive in the sense that it also provides a closed formula for the diffraction measure and the Fourier-Bohr coefficients (or amplitudes). Such a situation cannot be expected in general. and concrete…
This chapter is devoted to concepts for realizing nitride quantum dots by epitaxial methods. It starts with GaN quantum dots (QDs) grown on AlN, as these quantum dots can be grown using the Stranski–Krastanow regime, and important parameters controlling their properties are identified. It covers both the molecular bea…
This chapter presents an overview of the physics and device applications of intersubband (ISB) transitions in III-nitrides. It addresses the theoretical aspects of nitride ISB transitions, and reviews the spectroscopic investigations of ISB transitions in quantum wells (QWs) and QDs, as well as polar, semipolar, and c…
Abstract We review the challenges encountered when growing aluminum-rich nitride epilayers and devices by using MOVPE, MBE, and hydride vapour phase epitaxy (HVPE). Various issues related to both n- and p-doping, as well as control of dislocation densities, are addressed in the case of utilization of various substrate…
ii Advance in nanotechnology has made a good understanding of high frequency phonon dominant, nanometer scale thermal transport a necessity. To study nanometer-scale thermal transport in three dimensions, three-dimensional nanostructured materials are needed. In this work, fabrication of sub 100 nanometer periodic die…
Materials Science Mesoporous oxide materials have potential applications in light harvesting and catalysis and as electrode materials. Thin films of these materials are most often formed through a soft-templating process in which a precursor gel is patterned by nanoscale micelles that form from diblock copolymers duri…
Difficulties in achieving control over carrier concentration have impeded progress toward tailoring the electric fields in semiconducting oxide photocatalysts based on principles of electronic band-engineering drawn from classical microelectroncis. The present work demonstrates such principles using the model case of…
Methanogens are a group of microorganisms that utilize simple compounds such as H₂ + CO₂, acetate and methanol for the production of methane, an end-product of their metabolism. These obligate anaerobes belonging to the archaeal domain inhabit diverse anoxic environments such as rice paddy fields, human guts, rumen of…
Рассмотрена возможность получения изображений макроструктуры металлов и неметаллических материалов с помощью сканера. Проведено сравнение качества изображений, получаемых при помощи сканера и цифрового фотоаппарата. Приведены примеры количественного анализа изображений макроструктуры.
Рассмотрено влияние конусности гильз кристаллизаторов на ее стойкость и качество разливаемого слитка. Показано, что модификация по изменению конусности позволила оптимизировать профиль медных гильз, чтобы увеличить срок службы, улучшить качество блюма, повысить производительность машин непрерывного литья заготовок.
Micro- and nanostructured materials are a very important part of today’s technology due to their unique physical, optical, magnetic, and electrical properties. Many methods of producing these materials, however, require expensive precursors or templates and complicated, multi-step procedures. Ultrasonic spray pyrolysi…
Рассматриваются вопросы нанесения нанослоев вольфрама, молибдена, кобальта, карбида кремния, углерода с помощью магнетронной распределительной системы на порошки группы железа с последующим внесением их в расплав стали. Исследованы строения и свойства покрытия-модификатора и его воздействия на структуру и свойства ста…
It is showed that an increase of temperature and duration of holding time at termodiffuznom galvanizing in powder medium garttsink-Al2O3 leads to the layer thickness and the size of the samples growth. Coating thickness increases due to δ1k-compact phase having a fine crystalline structure, is in the range of 400-500…
Changes include adding to the explanation for applying TPQs for EHS that are molten solids or solids in solution, reinstated TRI reporting requirements for hydrogen sulfide, and updated radionuclides list.
На основе микроструктур чугуна с различным количеством включений пластинчатого и шаровидного графита, приведенных в ГОСТ 3443-87 «Отливки из чугуна с различной формой графита. Методы определения структуры», показаны возможности количественного автоматизированного анализа микроструктур ПГ2, ПГ4, ПГ6, ПГ10, ПГ12 (пласти…
Abstract LnBr[MoO4] (Ln: Pr, Nd, Sm, Gd—Lu) are prepared by solid state reaction of LnBr3, Ln2O3, and MoO3 in the molar ratio of 1:1:3 (evacuated silica ampoules, 820 °C, 7 d).
A double quantum dot device, connected to two channels that only see each other through interdot Coulomb repulsion, is analyzed using the numerical renormalization group technique. By using a two-impurity Anderson model, and parameter values obtained from experiment [S. Amasha {\it et al.}, Phys. Rev. Lett. {\bf 110},…