الصفحة 1
الصفحة 1
Wide-Gap Chalcopyrites
Chalcopyrites, in particular those with a wide band gap, are fascinating materials in terms of their technological potential in the next generation of thin-film solar cells and in terms of their basic material properties. They exhibit uniquely low defect formation energies, leading to unusual doping and phase behavior and to extremely benign grain boundaries. This book collects articles on a number of those basic material properties of wide-gap chalcopyrites, comparing them to their low-gap cousins. They explore the doping of the materials, the electronic structure and the transport through interfaces and grain boundaries, the formation of the electric field in a solar cell, the mechanisms and suppression of recombination, the role of inhomogeneities, and the technological role of wide-gap chalcopyrites.
Wide Bandgap Semiconductors : Fundamental Properties and Modern Photonic and Electronic Devices
This book offers a comprehensive overview of the development, current state and future prospects of wide bandgap semiconductor materials and related optoelectronics devices. It includes an overview of recent developments in III-V nitride semiconductors, SiC, diamond, ZnO, II-VI materials and related devices including AIGaN/GaN FET, UV LDs, white light LEDs, and cold electron emitters.With 901 references, 333 figures and 21 tables, this book will serve as a one-stop source of knowledge on wide bandgap semiconductors and related optoelectronics devices.
Vitamin deficiency
Vitamin deficiency is the condition of a long-term lack of a vitamin. When caused by not enough vitamin intake it is classified as a primary deficiency, whereas when due to an underlying disorder such as malabsorption it is called a secondary deficiency. An underlying disorder may be metabolic – as in a genetic defect for converting tryptophan to niacin – or from lifestyle choices that increase vitamin needs, such as smoking or drinking alcohol. Governments guidelines on vitamin deficiencies advise certain intakes for healthy people, with specific values for women, men, babies, the elderly, and during pregnancy or breastfeeding. Many countries have mandated vitamin food fortification programs to prevent commonly occurring vitamin deficiencies. Conversely hypervitaminosis refers to symptoms caused by vitamin intakes in excess of needs, especially for fat-soluble vitamins that can accumulate in body tissues.
Using calcium carbonate material as a bone graft following teeth extraction
Dental bone grafting is a crucial procedure in oral and maxillofacial surgery aimed at restoring bone volume and integrity for various dental applications, particularly in preparation for dental implants. The technique involves the transplantation of bone tissue or bone substitute into areas with inadequate bone structure due to tooth loss, periodontitis, trauma or congenital defects. in this research, we will discuss the dental bone grafting, including its indications, contraindications, types of graft materials, surgical techniques, and possible complications.
Transmission Electron Microscopy : Physics of Image Formation
Transmission Electron Microscopy: Physics of Image Formation presents the theory of image and contrast formation, and the analytical modes in transmission electron microscopy. The principles of particle and wave optics of electrons are described. Electron-specimen interactions are discussed for evaluating the theory of scattering and phase contrast. Also discussed are the kinematical and dynamical theories of electron diffraction and their applications for crystal-structure analysis and imaging of lattices and their defects. X-ray microanalysis and electron energy-loss spectroscopy are treated as analytical methods. Specimen damage and contamination by electron irradiation limits the resolution for biological and some inorganic specimens.
Topology in Condensed Matter
This book reports new results in condensed matter physics for which topological methods and ideas are important. It considers, on the one hand, recently discovered systems such as carbon nanocrystals and, on the other hand, new topological methods used to describe more traditional systems such as the Fermi surfaces of normal metals, liquid crystals and quasicrystals. The authors of the book are renowned specialists in their fields and present the results of ongoing research, some of it obtained only very recently and not yet published in monograph form.
Third-Party Liability of Classification Societies : A Comparative Perspective
Classification societies are charged with the technical supervision of maritime shipping to enhance the safety of life and property at sea by securing high te- nical standards of design, manufacture, construction and maintenance of seagoing vessels. Each and every shipping catastrophe caused by a technical defect reminds the maritime world of the central importance of the vessel’s proper technical supervision. Correspondingly, the liability of classification societies has become a particularly discussed issue over the past years. Their contractual liability is usually limited by general terms and conditions incorporated in the classification rules and cases brought by typical contracting partners of classification societies, such as ship owners and ship yards, are not an issue in the current debate. H- ever, one can note a substantial worldwide increase of actions brought by parties who are not in privity with classification societies. This study focuses on third-party liability of classification societies. It ori- nates in an expert opinion on selected issues relating to third-party liability which the authors compiled for the German classification society Germanischer Lloyd AG. Driven by the highly interesting legal issues and unexplored shores in this area of law
Theory of Quantum Transport in Metallic and Hybrid Nanostructures
A new science emerges at the intersection of modern physics, computer s- ence,andmaterialscience. Thestruggletofurtherminiaturizeisputtingna- technology to the verge of creating single-electron and/or single-spin devices that operate by moving a single electron (spin) and can serve as transistors, memory cells, and for logic gates. These devices take advantage of quantum physics that dominates nanometer size scales. The devices that utilize met- based hybrid nanostructures may possess signi?cant advantages over those exploiting purely semiconducting materials. First, the chemistry of metals is typically simpler than that of semiconductors. Second, the electric properties of metals are much less sensitive to the structural defects and impurities than those of semiconductors. Next, metallic devices allow better electric and th- mal contacts. Another important plus point is that in metals the electron de Broigle wavelength is smaller by many orders of magnitude as compared to that in semiconductor
Theory of Defects in Semiconductors
Semiconductor science and technology is the art of defect engineering. The theoretical modeling of defects has improved dramatically over the past decade. These tools are now applied to a wide range of materials issues: quantum dots, buckyballs, spintronics, interfaces, amorphous systems, and many others. This volume presents a coherent and detailed description of the field.
The role of six sigma
Banking Systems face a lot of changes and challenges, which necessitate applying new management and performance improvement concepts, as an attempt to achieve excellence, Six Sigma is considered to be one of the best methodologies that help in this regard because it may be utilized in improving banks performance and decrease defects in their processes. This study aimed to highlight the role of six sigma approach to improve the performance of Syrian banks according to the application of six sigma model elements (DMAIC) and selecting six sigma team (Improvement Team). Conclusions of the study show the importance of implementing Six Sigma methodology in all local sections including industrial and service organizations, and there is a tendency in the Syrian banks to utilize six sigma approach.
The Molecular Mechanisms of Axenfeld-Rieger Syndrome
Annotation The Molecular Mechanisms of Axenfeld-Rieger Syndrome describes the current research and clinical findings of the heterogeneous disorder termed Axenfeld-Rieger Syndrome (ARS). The book provides an in-depth analysis of this phenotypic diverse disorder and is designed to detail the current molecular and biochemical research involved in studying genetic defects. This book brings together the complete analysis of a human genetic defect using humans, mouse and chick epigenetic and genetic studies, combined with cell culture and in vitro analyses. It is a comprehensive study of a unique set of genes and their mutant activities. A molecular basis for the genetic and phenotypic anomalies observed in ARS patients is provided, with especially detailed descriptions of eye, tooth, and heart development.
The Metal-Hydrogen System : Basic Bulk Properties
Metal hydrides are of inestimable importance for the future of hydrogen energy. This unique monograph presents a clear and comprehensive description of the bulk properties of the metal-hydrogen system. The statistical thermodynamics is treated over a very wide range of pressure, temperature and composition. Another prominent feature of the book is its elucidation of the quantum mechanical behavior of interstitial hydrogen atoms, including their states and motion. The important topic of hydrogen interaction with lattice defects and its materials-science implications are also discussed thoroughly. This second edition has been substantially revised and updated.
The Materials Science of Semiconductors
The Materials Science of Semiconductors serves as a general textbook on semiconductors, and discusses semiconductors in detail, from the fundamental basis for their electronic structure to engineering of alloys and the effects of defects. Written for graduate and advanced undergraduate students in the hard sciences, this book covers the materials science of semiconductors rather than focusing on electronic devices as a primary topic.
Testing of Materials and Elements in Civil Engineering ; Vol. II
Presents recent developments in the field of testing of materials and elements in civil engineering. For this reason, the articles highlighted in this editorial relate to different aspects of this topic, from building materials to building structures. The current trend in the development of materials testing in civil engineering is mainly concerned with the detection of flaws and defects in elements and structures using destructive, semidestructive, and nondestructive testing
Surface Waves in Anisotropic and Laminated Bodies and Defects Detection
Among the variety of wave motions one can single out surface wave pr- agation since these surface waves often adjust the features of the energy transfer in the continuum (system), its deformation and fracture. Predicted by Rayleigh in 1885, surface waves represent waves localized in the vicinity of extendedboundaries(surfaces)of?uidsorelasticmedia. Intheidealcase of an isotropic elastic half-space while the Rayleigh waves propagate along the surface, the wave amplitude (displacement) in the transverse direction exponentially decays with increasing distance away from the surface
Sickle cell anemia : A New era of awareness in Syria
In industrialized countries, about 3% of pregnancies result in significant genetic diseases or birth defects, leading to severe conditions or early death. The prevalence of SCA is estimated by Friends of Thalassemia and Genetic Blood Disorders Association at 2,500 patients in Syria, with 500 in Damascus, and cases are increasing. The high rate of consanguinity suggests a higher prevalence of these disorders, imposing substantial medical, financial, and emotional burdens.
Safety, Reliability and Risks Associated with Water, Oil and Gas Pipelines
In this book, the three two major defect assessment tools for pipes are presented : i) the failure assessment diagram and particularly the SINTAP procedure, ii) limit analysis, iii) strain design approach Methods of defect repair are based on investigation findings. Methods such as welded sleeve, repair clamp composite sleeve, grinding, pipe replacement are described.
Residual Stress and Its Effects on Fatigue and Fracture ; Proceedings of a Special Symposium held within the 16th European Conference of Fracture - ECF16, Alexandroupolis, Greece, 3-7 July, 2006
Simplified fracture mechanics based assessment methods are widely used by the industry to determine the structural integrity significance of postulated cracks, manufacturing flaws, service-induced cracking or suspected degradation of engineering components under normal and abnormal service loads. In many cases, welded joints are the regions most likely to contain original fabrication defects or cracks initiating and growing during service operation. Various procedures provide upper bound residual stress profiles for various classes of welded joints that can be used in fracture assessments, but these often give very conservative results. Recently, the option to use more realistic profiles has been adopted, but only where such profiles are based on finite element residual stress simulations supported by detailed residual stress measurements.
Removable partial dentures: a practitioners’ manual
Describes the latest developments in planning, materials, and techniques for successful fabrication of removable partial dentures (RPDs). Readers will find information on decision-making regarding treatment options, clasp-retained RPDs and esthetic solutions, attachments and double crown systems in RPDs, implant-assisted RPDs, maintenance and post-insertion problems for all types of RPDs, the role of RPDs in the management of temporomandibular disorders and the treatment of maxillofacial defects, the re-establishment of occlusal vertical dimension and maximal intercuspation, the rules for disinfection in prosthodontic practice.
Quantum Chemistry of Solids : The LCAO First Principles Treatment of Crystals
Quantum Chemistry of Solids delivers a comprehensive account of the main features and possibilities of LCAO methods for the first principles calculations of electronic structure of periodic systems.
