Xem 1-20 trên 1153 kết quả Technology materials
  • While selecting the coating material, we encounter a barrier caused by the fact that numerous properties expected from an ideal coating are impossible to be obtained simultaneously. For example, an increase in hardness and strength causes the reduction of the coating’s ductility and adherence to the substrate.

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  • Nanowires can be defined as structures with thicknesses or diameters of tens of nanometers or less and unconstrained lengths. Many different types of nanowires exist, including metallic (e.g., Ni, Pt, Au or different alloys based on metals), semiconducting (e.g., Si, InP, GaN, etc.), insulating (e.g., SiO2, TiO2), and molecular nanowires (e.g. organic DNA or inorganic). Nanowires have many interesting properties that are not seen in bulk or 3-D materials.

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  • The application of the nanostructure coatings is seen as the solution of this issue (Voevodin et al., 2005; Yang et al., 2007). According to the Hall–Petch equation, the strength properties of the material rise along with the reduction of the grain size. In case of the coatings deposited in the PVD processes, the structures obtained with grain size ~10 nm cause the obtainment of the maximum mechanical properties.

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  • he goal is to provide tools for leaders to improve both the environmental performance and overall competiveness by reducing materials, energy and water utilization. Section 5 are papers related to sustainable environment: all aspects of ecosystem for sustainable development, ecological assessment and sustainability for the environment.

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  • There are two basic approaches of synthesizing nanowires: top-down and bottom-up pproach. In a top-down approach a large piece of material is cut down to small pieces hrough different means such as lithography and electrophoresis. In a bottom-up approach he nanowire is synthesized by the combination of constituent ad-atoms. Most of the ynthesis techniques nowadays are based on bottom-up approaches.

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  • information technology industry is the application of technology management and information processing IT industry to use computers and computer software to convert, store, protect, process, transmit, and gather information. This book is for those materials and specialized information technology and computers, including the words, English grammar information technology industry.

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  • This text offers 25 topic-based units, each covering a key area of IT. There is a variety of texts and visual material, taken from textbooks, newspapers, computing magazines, web pages, manuals, and advertisements. The course revises and practises grammar and functions appropriate to the needs of IT specialists at intermediate level, developing all four skills, with the main emphasis on reading. Most units end with longer specialist reading texts. These are intentionally challenging, and can be used either for homework or self-study.

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  • Tham khảo sách 'welding material handbook', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • The chapter commences by reviewing the properties of the broad classes of materials used in film coating, polymers, plasticizers, pigments and solvents (or vehicles). An initial consideration of the polymers shows that while processing is most commonly performed using these materials in solution, there are systems which utilize polymers in suspension in water. The mechanism of coalescence and film formation for these types of materials are discussed.

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  • The known dependency between the hardness and abrasion resistance became the foundation for the development of harder and harder coating materials. The progress in the field of producing coatings in the physical vapour deposition process enables the obtainment of coatings of nanocrystal structure presenting high mechanical and usable properties.

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  • Nanocrystals have been attracting much attention for future science and technology. Chapters are sought that address innovative solutions to the design, synthesis, crystallization, morphology control, self-assembly, nano/micro-structure formation, patterning, novel property and device application of Nanocrystals. The book involves Nanocrystals of metal oxides, semiconductors, compounds, noble metals, metals, inorganic materials, carbon materials, organic molecules, polymers, bio materials, hybrid materials, composites, etc....

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  • Clothing is one of our basic needs in life. The second most important technique of manufacturing either clothing or clothing material is the knitting. Apparently, knitting is a very simple technique of making fabric or clothing, but it has complexity too. The more we study and the more we research on knitting, more and more mysteries of knitting are being unveiled and we become more confident to control the technology of knitting for producing from simpler to complex fabrics for diversified applications in addition to traditional apparels even at a very high speed....

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  • These unique characteristics plus the functionalities from the materials themselves impart nanofibers with a number of novel properties for applications in areas as various as biomedical engineering, wound healing, drug delivery and release control, catalyst and enzyme carriers, filtration, environment protection, composite reinforcement, sensors, optics, energy harvest and storage, and many others. More and more emphasis has recently been placed on large-scale nanofiber production, the key technology to the wide usages of nanofibers in practice....

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  • The increasing demand for energy worldwide, together with the depletion of crude oil reserves, environmental threats due to greenhouse gas emissions and new national and international legislation, is resulting in the imperative for petroleum-derived fuels to be complemented or substituted by biofuels. Such an alternative, renewable, biodegradable and nontoxic biofuel is biodiesel. The book “Biodiesel: Feedstocks and Processing Technologies” is intended to provide a professional look on the recent achievements and emerging trends in biodiesel production.

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  • The third book of four-volume edition of “Solar Cells” is devoted to solar cells based on silicon wafers, i.e., the main material used in today's photovoltaics. Single-crystalline Si (c-Si) modules are among the most efficient but at the same time the most expensive since they require the highest purity silicon and involve a lot of stages of complicated processes in their manufacture. Polycrystalline silicon (mc-Si) cells are less expensive to produce solar cells but are less efficient.

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  • Recycling of plastic materials is now an important field in the plastics industry, not just an activity born under environmental pressure. The recycling processes include industrial operations in which secondary materials are reprocessed and/or monomers recovered for further polymerization; such processes are termed secondary and tertiary recycling.

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  • This book provides excellent review on the techniques for fabrication aimed to specific applications for current technology. A tremendous amount of work is presented on different modeling and simulation based on the applied semiconductor physics of carbon nanotubes. In the past decades, although carbon nanotubes have undergone massive research, considering the success of silicon, it has, nonetheless, been difficult to appreciate the potential influence of carbon nanotubes in current technology....

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  • Materials are important to mankind because of the benefits that can be derived from the manipulation of their properties, for example electrical conductivity, dielectric constant, magnetization, optical transmittance, strength and toughness. Materials science is a broad field and can be considered to be an interdisciplinary area. Included within it are the studies of the structure and properties of any material, the creation of new types of materials, and the manipulation of a material's properties to suit the needs of a specific application....

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  • - of the third edition, while maintaining an emphasis on nutrition and, in particular, the effects of processing on the nutritive value of the products as compared with that of the raw cereals. However, some new material has been introduced, notably sections dealing with extrusion cooking and the use of cereals for animal feed, and the section on industrial uses for cereals has been considerably enlarged. A change in the fourth edition, which readers of earlier editions will notice, is the order in which the material is presented.

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  • Such a breathtaking pace of research has allowed to explore the field in several directions within just a few years. The synthesis of free-standing nanowire structures now nvolves a large variety of methods and materials, including elemental and compound (both binary and multinary) semiconductors as well as complex modulated nanostructures.

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