Xem 1-20 trên 1400 kết quả Metals
  • Tham khảo tài liệu 'sheet metal clip', 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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  • Tham khảo tài liệu 'chương 5: thiết kế chi tiết dạng tấm (sheet metal)', công nghệ thông tin, đồ họa - thiết kế - flash phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf10p lelamttt 15-11-2010 171 69   Download

  • Clear, practical and comprehensive, this mechanical estimating manual provides an indispensable resource for contractors, estimators, owners and anyone involved with estimating mechanical costs on construction projects, including a wealth of labor and price data, formulas, charts and graphs. Covering time-proven methodologies and procedures, it offers the user a full range of ready-to-use forms, detailed estimating guidelines, and numerous completed examples.

    pdf318p kennybibo 14-07-2012 104 54   Download

  • Nu metal (nu-metal, còn gọi là aggro metal, hay nü metal theo truyền thống dùng dấu umlaut cho các tên heavy metal) là một thể loại âm nhạc khởi nguyên từ giữa thập niên 1990. Nó chịu ảnh hưởng chung từ grunge và alternative metal của đầu thập niên 1990 với hip hop, nhạc điện tử và một vài thể loại nhạc metal khác, nhiều nhất là thrash metal và groove metal . Dòng nhạc này phổ biến nhất vào cuối thập niên 1990, đầu những năm 2000....

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  • Báo cáo môn Kĩ thuật chiếu sáng: Đèn metal halide có nội dung giới thiệu về đèn metal halide, đặc tính cấu tạo, các hãng sản xuất, ứng dụng của đèn metal halide và một số nội dung liên quan khác.

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  • Báo cáo môn Kĩ thuật chiếu sáng: Đèn metal halide 2 có nội dung giới thiệu chung về metal halide, đặc tính, cấu tạo và nguyên lý hoạt động, ứng dụng của đèn metal halide.

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  • Characterizing the nature of heavy metal release reactions, sorption mechanisms, and movement in the soil is the main topic of this book. Because soils are heterogeneous, heavy metals in soils can be involved in a series of complex chemical and biological interactions including oxidation-reduction, precipitation and dissolution, volatilization, and surface and solution phase complexation. The heterogeneous nature of the different soil constituents adds to the complexity of interactions of heavy metal species with the soil environment....

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  • This book is the result of discussions that took place at the Pellston Workshop on Assessing the Hazard of Metals and Inorganic Metal Substances in Aquatic and Terrestrial Systems. The workshop, sponsored by the Society of Environmental Toxicology and Chemistry (SETAC), was held 3–8 May, 2003, in Pensacola, FL.

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  • The story of metal casting is as glamorous as it is ancient, beginning with the dawn of human civilization and interwoven with legends of fantastic weapons and exquisite artworks made of precious metals. It was and is involved in the two main activities of humans since they began walking the earth: producing and defending wealth. Civilization as we know it would not have been possible without metal casting. Metal casting must have emerged from the darkness of antiquity first as magic, later to evolve as an art, then as a technology, and finally as a complex, interdisciplinary science....

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  • Metal foams are a new, as yet imperfectly characterized, class of materials with low densities and novel physical, mechanical, thermal, electrical and acoustic properties. They offer potential for lightweight structures, for energy absorption, and for thermal management; and some of them, at least, are cheap. The current understanding of their production, properties and uses in assembled in this Design Guide.

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  • Metal nanoparticles are certain to be the building blocks of the next generation of electronic, optoelectronic and chemical sensing devices. The physical limits imposed by top-down methods such as photo- and electron- beam lithography dictate that the synthesis and assembly of functional nanoscale materials will become the province of chemists.

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  • Different aspects of metal forming, consisting of process, tools and design, are presented in this book. The chapters of this book include the state of art and analysis of the processes considering the materials characteristics. The processes of hydroforming, forging and forming of sandwich sheet are discussed. Also, a chapter on topography of tools, and another chapter on machine tools are presented. Design of a programmable metal forming press and methods for predicting forming limits of sheet metal are described....

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  • Metals come from under the ground. Most metals are found in rocks, which are drilled out and crushed.The rocks are heated to make the metal melt. When the metal cools, it turns into a solid block.There are many different types of metal. Very strong metals are used to make bridges, boats and cranes.

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  • This chapter aims to provide basic backgrounds of different types of machining processes and highlights on an understanding of important parameters which affects machining of metals. • Mechanics of machining is introduced for the calculation of power used in metal machining operation • Finally defects occurring in the machining processes will be discussed with its solutions. Significant factors influencing economics of machining will also be included to give the optimum machining efficiency.

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  • Đề tài nghiên cứu tăng khả năng phân tích gang hợp kim cao Cr trên máy phân tích phổ Metal - Lab 75-80J nhằm mục đích tăng cường năng lực thiết bị và đáp ứng nhu cầu đào tạo đội ngũ cán bộ thử nghiệm, đo lường có đủ kỹ năng cho Phòng thí nghiệm. Mời các bạn cùng tham khảo nội dung chi tiết.

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  • The long-term effects of treatment with sirolimus-eluting stents, as compared with bare-metal stents, have not been established. Methods We performed an analysis of individual data on 4958 patients enrolled in 14 randomized trials comparing sirolimus-eluting stents with bare-metal stents (mean followup interval, 12.1 to 58.9 months). The primary end point was death from any cause. Other outcomes were stent thrombosis, the composite end point of death or myocardial infarction, and the composite of death, myocardial infarction, or reintervention....

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  • Armchair Fiction presents extra large paperback editions of classic science fiction double novels. The first novel, "The Metal Doom," is a grand sci-fi adventure by venerable sci-fi author, David H. Keller, M. D. Imagine a world without metal… When all the metal was gone, the civilized world ended. People like the Tublers and John Stafford started the slow rebuilding of society—a job made difficult enough by the lack of metal tools and weapons.

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  • Cadmium is a heavy metal and a pollutant that can be found in large quantities in the environment from industrial waste. Its toxicity for living organisms could arise from its ability to alter thiol-containing cellular com-ponents. Glutathione is an abundant tripeptide (c-Glu-Cys-Gly) that is described as the first line of defence against cadmium in many cell types.

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  • Metal forming to make large parts, take large reductions, use high strength materials, work to net shape (precision flashless closed die forging), and use cold forming to obtain certain physical properties all require high forming forces. These forces may be larger than the capacity of existing machinery.



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  • The appropriate conditions have been found for syntheses of a series of azomethines using the reaction between cyclohexylamine and different aromatic aldehydes. The structures of products have been determined by the data of IR- and 1 H-NMR-spectra. All obtained azomethines have metallic inhibition corrosion capacities on CT-3 steel and aluminum in different levels. The influences of structures to their metallic inhibition corrosion capacities have been discussed.

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