Material considerations

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  • With the exception of admixtures and fly ash, all moulds and materials are discussed in this chapter. None of the factors listed can be considered in isolation since variation in one will often affect another. Mix design for various forms of precast manufacture is dealt with in Chapter 6. The purpose of this chapter is to acquaint the reader with all the starting variables. The background picture will then be fully understood before one proceeds to put these variables into a process, in order to produce a precast concrete product....

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  • Since the First International Congress on Liquid Crystals (Lcs), held at Kent State University, OH, USA, in 1965, the implications of these systems associated with various aspects of telecommunications, laser, display, automobile, aerospace technologies, thermo-optics, medicine and biology have been the subject of considerable debate among researchers, scientists and engineers. Indeed, LCs, being a unique mesomorphic phase of matter, combine properties of both solids (long-range orientation order, manifestations of Bragg diffraction, etc.) and liquids (fluidity, viscosity, etc.).

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  • Armor materials are remarkable: Able to stop multiple hits and save lives, they are essential to our military capability in the current conflicts. But as threats have increased, armor systems have become heavier, creating a huge burden for the warfighter and even for combat vehicles.

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  • In 1968 the NCRP Board of Directors, in an expansion of its internal emitter effort, assigned to Scientific Committee 24 the task of examining tritiated thymidine to determine whether the values for pennissible body burdens and concentrations of tritium as tritiated water given in NCRP Report No. 22 would be applicable. As the Committee studied the problem, they decided it would be appropriate to examine all radionuclides and additional compounds that have the potential for incorporation into genetic material....

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  • Explosives and propellants contain considerable chemical energy that can be converted into rapid expansion. In contrast to the simple burning of a fuel, explosives and propellants are self-contained and do not need an external supply of oxygen via air. Since their energy content inherently creates the risk of accidental triggering of the explosive reaction, the correct synthesis, formulation, and handling during production and use are of utmost importance for safety, necessitating specialist knowledge on energetic materials, their characteristics, handling and applications.

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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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  • When asked where landscape architects work, many people might point out their back door to the garden. It would be more accurate, however, to look out the front door. The landscape is anywhere and everywhere outdoors, and landscape architects are shaping the face of the Earth across cities, towns and countryside alike. Landscape architecture involves shaping and managing the physical world and the natural systems that we inhabit. Landscape architects do design gardens, but what is critical is that the garden, or any other outdoor space, is seen in context.

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  • Synthesis has a central role in the development of Science especially in Chemistry. The strategies adopted in synthesis of molecules and materials have undergone considerable changes in recent times and it was felt that it may be necessary to assess and assimilate information on this topic in a single place. Though, no originality is claimed to the contents on this topic, the very fact that the available information on this topic is available in one place itself is considered to be a major step forward.

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  • Recent experiences from carrying out Design for Assembly (DFA) and Design for Manufacture (DFM) product studies in industry have reinforced the authors’ belief that consideration of manufacturing problems at the design stage is the major means available for improving product quality, reducing manufacturing costs and increasing productivity. In the second edition, as well as providing further information to help select processes for components and the joining of components, we have included data on assembly process selection and costing.

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  • Enormous number of books, reviews and original papers concerning engineering applications of heat transfer has already been published and numerous new publications appear every year due to exceptionally wide list of objects and processes that require to be considered with a view to thermal energy redistribution. All the three mechanisms of heat transfer (conduction, convection and radiation) contribute to energy redistribution, however frequently the dominant mechanism can be singled out.

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  • It’s now not too hard to find problems and solutions on the Internet due to the increasing number of websites devoted to mathematical problem solving. It is our hope that this collection saves you considerable time searching the problems you really want. We intend to give an outline of solutions to the problems in the future. Now enjoy these “cakes” from Vietnam first.

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  • Despite its considerable potential for energy savings, energy efficiency is still far from realizing this potential. This is particularly true in the electrical sector (IEA, 2010). Why? There is no probably just one single answer to this question. A consequential response requires major multiform research and an analytical effort. No doubt that analysis of the interaction between energy efficiency policies and energy efficiency performance of economies accounts for a significant part of the effort....

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  • Modern electrical drive systems are composed principally of; motors, power electronics components, transformers, analog/digital controllers and sensors or observers. The improvements and the enormous advances in the fi eld of power electronic (semiconductor components), converters technology and soft ware/implementation technology have enabled advanced and complex control techniques. With these advances and robust control algorithms improved, considerable research eff ort is devoted for developing optimal techniques of speed and torque control for induction machines....

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  • Recent 40 years have witnessed considerable advances in experimental, theoretical and calculation approaches as well as in industrial utilizations. In this way, this book aims to bring together current progresses in some special heat transfer fields contributing to the dissemination of high-quality research efforts.

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  • Tàu thuyền, xe tăng, và đường ống dẫn mang, cửa hàng, hoặc nhận được các chất lỏng được gọi là áp lực mạch. Một tàu áp lực được định nghĩa như là một container với một áp lực sự khác biệt giữa bên trong và bên ngoài.

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  • Said systems are complex, producing awhole that cannot be understood by only analyzing the individual parts. They must be dealt with as a system that is characterized by all the essential properties of any social system Yolles (2006). For this reason, the following properties must be taken into consideration when modeling organizational systems.

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  • The automotive industry is experiencing a considerable “stress period”, which can lead to important changes in the whole industry. Many aspects contribute to this situation, starting from the global recession (unemployment rates, slowing growth, etc.) to credit meltdown (dependency of car sales on credit, OEM refi nancing, etc.) and fi nishing with globalization aspects (global sourcing, foreign investments, etc.) and “green challenges” (both for the industry and the fi nal products)....

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  • This book, Environmental Toxicology, is essentially the third, updated and improved version of the highly successful second edition of Principles of Environmental Toxicology. Basically the same outlay of chapters and the way of presentation were maintained; however, considerable changes and improvement were incorporated into this edition

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  • These handling methods are implemented individually, or in combination, by commercially available material-handling equipment types. 38.5 MATERIAL-HANDLING EQUIPMENT CONSIDERATIONS AND EXAMPLES 3 . . Developing the Plan 851 Once the material-handling problem has been identified and the relevant data have been collected and analyzed, the next step in the design process is to develop a plan for solving the problem. This usually involves the design and/or selection of appropriate types, sizes, and capacities of materialhandling equipment.

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  • In recent years, it was realized that the Multiple Input Multiple Output (MIMO) communication systems seems to be inevitable in accelerated evolution of high data rates applications. The MIMO systems, have received considerable att ention of researchers and commercial companies due to their potential to dramatically increase the spectral effi ciency and simultaneously sending individual information to the corresponding users in wireless systems.

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