Chemical properties

Xem 1-20 trên 294 kết quả Chemical properties
  • This paper is devoted to the study of the relationship between structure and optical properties of silica glasses doped with optically active Er3+ ions and reported the influence of the suitably selected heat treatment on the optical properties of silica glasses. The physico-chemical properties of Er3+doped silica are presented, which has been related with the effects of hydroxyl groups on the luminescence property of Er3+ in the host matrix of silica.

    pdf6p uocvong02 24-09-2015 10 2   Download

  • It is traditional to begin books about polyurethanes by defining the class of polymers that has come to be known as polyurethanes. Unlike olefin-based polymers (poly- ethylene, polypropylene, etc.), the uniqueness of polyurethane is that it results not from a specific monomer (ethylene, propylene, etc.), but rather from a type of reaction, specifically the formation of a specific chemical bond. Inevitably, the discussion in traditional books then progresses to the component parts, the produc- tion processes, and ultimately the uses.

    pdf181p layon_5 30-03-2013 21 9   Download

  • The effects of micronization methods, mechanical and jet millings, on the physico-chemical properties of mushroom (Lentinus edodes) powder were investigated in contrast to shear pulverization. The powders of dried mushroom cap and stipe were prepared to obtain six powders. Compared to shear pulverization, mechanical and jet millings effectively reduced particle size and brought about a narrow and uniform particle size distribution.

    pdf8p the_eye_1991 18-09-2012 31 6   Download

  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"Influence of decaying wood on chemical properties of forest floors and surface mineral soils: a pilot study...

    pdf11p toshiba7 08-10-2011 28 4   Download

  • Water chemistry and mineral solubility, soil minerals and surface chemical properties, electrochemistry and kinetics, soil dynamics and agriculturai, organic chemicals,... As the main contents of the teex book "Environmental Soil and Water Chemistry". Invite you to consult.

    pdf577p nguyenphong201 12-12-2015 9 4   Download

  • Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Comparison of the impact of blue spruce and reed Calamagrostis villosa on forest soil chemical properties...

    pdf7p toshiba3 09-09-2011 29 2   Download

  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Genetic variation and genotype by environment interactions of juvenile wood chemical properties in Pinus taeda L...

    pdf8p toshiba5 15-09-2011 30 2   Download

  • Selective isolation of Gold facilitated by second sphere coordination with a cyclodextrin the interaction of human beings with Gold is an activity that has been ongoing since ancient times as a result of this precious metal’s unique physical and chemical properties. As the price of Gold has skyrocketed during the past decade, a significant economic incentive exists for its recovery1, not only from ores, but also from the waste products of consumer electronics.

    pdf9p tientung000 09-09-2016 7 1   Download

  • Organic chemistry is a subdiscipline within chemistry involving the scientific study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of carbon-based compounds, hydrocarbons, and their derivatives. Organic compounds are structurally diverse. The range of application of organic compounds is enormous. They either form the basis of, or are important constituents of, many products including plastics, drugs, petrochemicals, food, explosives, and paints....

    ppt59p loc5heo 07-06-2011 104 40   Download

  • Most plastic materials are used because they have desirable mechanical properties at an economical cost. For this reason, the mechanical properties may be considered the most important of all the physical and chemical properties of high polymers for most applications. Thus everyone working with such materials needs at least an elementary knowledge of their mechanical behavior and how this behavior can be modified by the numerous structural factors that can be varied in polymers.

    pdf138p ktcn_1 10-07-2012 64 35   Download

  • Chemistry comprises two related but distinct activities:(i)the quest for an understanding of matter and material change,(ii)the utilization of material change for human ends.Ideally, thefirst activity provides the necessary know-how for the pursuit of the second, but in practice, the help it can give is only partial, and the second activity has to fall back on trial and error techniques in order to achieve its ends. This means that a good chemist is one who not only has a mastery of chemical theory, but also a good knowledge of chemical facts.

    pdf177p tuanloc_do 04-12-2012 54 21   Download

  • There are many contents in this book: physical properties of pure substances, vapor pressures of pure substances, vapor pressures of solutions, physical and chemical data, water-vapor content of gases, densities of pure substances, densities of aqueous inorganic solutions at 1 atm, densities of aqueous organic solutions, densities of miscellaneous materials, physical and chemical data, specific heats of miscellaneous materials, properties of formation and, combustion reactions.

    pdf521p langtuthangpro 14-04-2014 106 12   Download

  • Ionic Liquids (ILs) are one of the most interesting and rapidly developing areas of modern physical chemistry, technologies and engineering. This book, consisting of 29 chapters gathered in 4 sections, reviews in detail and compiles information about some important physical-chemical properties of ILs and new practical approaches. This is the first book of a series of forthcoming publications on this field by this publisher.

    pdf0p cucdai_1 20-10-2012 37 11   Download

  • Preparations derived from Lentinula edodes (Berk.) Pegl. mycelium are worldwide used as dietary supplements containing compounds active as immune system enhancers, demonstrating chemopreventive and anticancer activity. L. edodes mycelium enriched with organic forms of selenium like selenized yeast possess putative, higher cancer preventive properties. The objective of this study was to test the effect of enrichment in selenium on antioxidant, reducing and free radical scavenging activity of water and alcohol extracts from mycelium of L. edodes (Berk.).

    pdf7p the_eye_1991 18-09-2012 40 10   Download

  • Chemical substances (also called pure substances) may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook.[2] According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.[3] The chemical substance index published by CAS also includes several alloys of uncertain composition.

    pdf688p ngoctu2394 28-11-2012 29 10   Download

  • The Project Gutenberg EBook of The Chemistry, Properties and Tests of Precious Stones, by John Mastin This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at Title: The Chemistry, Properties and Tests of Precious Stones Author: John Mastin Release Date: November 26, 2007

    pdf311p khangoc2391 26-09-2012 23 9   Download

  • Characterization and elucidation of the size-dependent evolution of the physical and chemical properties of finite materials aggregates, having discrete quantized energy level spectra, specific structural and morphological motifs and exhibiting unique dynamical characteristics, are among the outstanding challenges of modern materials science.

    pdf514p thix1minh 16-10-2012 22 7   Download

  • Tham khảo sách 'the chemistry, properties and tests of precious stones, by john', khoa học tự nhiên, hoá học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

    pdf311p ngoctu2394 28-11-2012 26 7   Download

  • Amines are extremely important intermediates and end products of the chemical industry and are often obtained by hydrogenation of the corresponding nitro compounds or imines. A search of the literature reveals, that hydrogenation of nitro compounds catalyzed by well-defined molecular complexes in aqueous solutions is rare.

    pdf51p ruavanguom 25-09-2012 33 6   Download

  • Cerium, an element in the lanthanide series, has a number of radioactive isotopes. Several of these are produced in abundance in nuclear fission reactions associated with nuclear industry operations or detonation of nuclear devices. This report summarizes our present knowledge of the relevant physical, chemical, and biological properties of radiocerium as a basis for establishing radiation protection guidelines.

    pdf119p camchuong_1 04-12-2012 20 6   Download

Đồng bộ tài khoản