Xem 1-20 trên 113 kết quả Metal oxides
  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Ultraviolet photodetectors based on ZnO nanorods-seed layer effect and metal oxide modifying layer effect

    pdf6p sting05 09-02-2012 30 5   Download

  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: A general strategy for synthesis of metal oxide nanoparticles attached on carbon nanomaterials

    pdf5p sting05 10-02-2012 31 5   Download

  • Manufacture of metal oxide electrodes: Thermochemical oxide layers, metal oxide hydrates, amorphous and crystalline powders, and supported and adsorbed ruthenium di-oxide (RuO2).

    pdf14p congdat261 01-12-2010 36 4   Download

  • A three-dimensional macroporous Cu/SnO2 composite anode sheet prepared via a novel method was prepared via a novel method that is based on selective reduction of metal oxides at appropriate temperatures. SnO2 particles were imbedded on the Cu particles within the three-dimensionally interconnected Cu substrate.

    pdf6p nguyenphong201 09-07-2016 11 1   Download

  • 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....

    pdf0p 951628473 07-05-2012 61 22   Download

  • Permanganate may be applied to sites as either potassium permanganate (KMnO4) or sodium permanganate (NaMnO4). Where cost dominates over engineering factors at a site, potassium permanganate is the preferred chemical form because it is more widely available, less costly, and is available in solid form, which facilitates transport and handling. Where other factors are more important, the liquid form of sodium permangante is preferable.

    pdf52p cao_can 29-12-2012 48 20   Download

  • Catalytic oxidation of organic compounds is an extremely important field of chemistry, spanning the range from biological oxidations to large scale industrial production of commodity chemicals. However, many of these transformations can hardly be classified as organometallic reactions, since the catalysts (often simple metal salts) and the intermediates can be rather regarded as coordination complexes than organometallic compounds.

    pdf7p boyminsk 10-06-2010 64 18   Download

  • In order to meet the increasing demand for valve-regulated lead–acid ŽVRLA. batteries, a new soft lead has been produced by Pasminco Metals. In this material, bismuth is increased to a level that produces a significant improvement in battery cycle life. By contrast, other common impurities, such as arsenic, cobalt, chromium, nickel, antimony and tellurium, that are known to be harmful to VRLA batteries are controlled to very low levels. A bismuth ŽBi.-bearing oxide has been manufactured ŽBarton-pot method. ...

    pdf11p congdat261 19-11-2010 67 13   Download

  • According to American Society for Testing and Materials' corrosion glossary, corrosion is defined as "the chemical or electrochemical reaction between a material, usually a metal, and its environment that produces a deterioration of the material and its properties".1 Other definitions include Fontana's description that corrosion is the extractive metallurgy in reverse,2 which is expected since metals thermodynamically are less stable in their elemental forms than in their compound forms as ores.

    pdf176p thienbinh1311 13-12-2012 30 11   Download

  • Research on nanoparticles, including synthesis, characterization of the structural, chemical and physical properties, assembly into 1-, 2- and 3-dimensional architectures extending over several lengths scales and with hierarchical construction principles, and application in various fields of technology, represents a fundamental cornerstone of nanoscience and nanotechnology.

    pdf230p xrzc1-1 18-09-2013 53 7   Download

  • Almost 4000 years ago Egyptians and Babylonians used aluminum compounds in various chemicals and medicines. Herodotus mentioned alum in the fifth century b.c. and Pliny referred to “alumen,” now known as alum, as a mordant to fix dyes to textiles around 80 a.d. In 1754 Marggraf showed that a distinct compound existed in both alum and clays. In 1761 the French chemist Guyton de Morveau proposed the name “alumine” for the base in alum, identified in 1787 by Antoine Lavosier as the oxide of a then-undiscovered element.

    pdf40p dienthoi 09-05-2013 28 4   Download

  • Metallothionein-3, also called neuronal growth-inhibitory factor, is one of the four members of the mammalian metallothionein family, which in turn belongs to the metallothionein, a class of ubiquitously occurring low-molecular-weight cysteine- and metal-rich proteins containing metal– thiolate clusters.

    pdf10p mobifone23 21-01-2013 15 2   Download

  • Prefractionation procedures facilitate the identification of lower-abundance proteins in proteome analysis. Here we have optimized the conditions for immobilized metal affinity chromatography (IMAC) to enrich for phos-phoproteins. The metal ions, Ga(III), Fe(III), Zn(II), and Al(III), were compared for their abilities to trap phosphoproteins; Ga(III) was the best.

    pdf12p galaxyss3 21-03-2013 7 2   Download

  • H2 -forming methylenetetrahydromethanopterin dehydro-genase (Hmd) is an unusual hydrogenase present in many methanogenic archaea. The homodimeric enzyme dubbed metal-free hydrogenase does not contain iron–sulfur clus-ters or nickel and thus differs from [Ni-Fe] and [Fe-Fe] hydrogenases, which are all iron–sulfur proteins. Hmd preparations were found to contain up to 1 mol iron per 40 kDa subunit, but the iron was considered to be a con-taminant as none of the catalytic and spectroscopic pro-perties of the enzyme indicated that it was an essential component....

    pdf10p dell39 03-04-2013 10 2   Download

  • It is widely accepted that oxidative modification of lowdensity lipoprotein (LDL) plays a pivotal role in the initiation and development of atherosclerosis. In the present study, we found that the MeOH and H2O extracts of the plant Ampelopsis cantoniensis, and its main constituent, myricetin, possessed significant protective effects on LDL oxidation induced by either a metal ion (Cu2+) or a free radical (AAPH).

    pdf4p uocvong04 24-09-2015 11 2   Download

  • Selective fractionation was applied to partition of heavy metals in river sediment of the rivers Nhue and Tolich Hanoi’s outskirts. The observed results showed a considerable difference of the proportion of various fractions of studied heavy metals. The residual fraction of Cu, Pb, Zn, Cd, Cr, and Ni stayed the highest portions. The portions/percentages of Cu, Pb, Zn, Cd as carbonate fractions were comparatively higher than those as Fe-Mn oxide fractions and organic fractions.

    pdf6p uocvong04 24-09-2015 4 2   Download

  • Since their first introduction, metallic biomaterials have always been designed to be corrosion resistant. For decades, this paradigm has become the mainframe of the biomaterials world. It has been cited in thousands of scientific papers and taught in hundreds of courses of materials for biomedical devices. It has also been followed by industries in developing millions of medical devices until today. Nowadays, with the advent of tissue engineering, biomaterials are envisaged to actively interact with the body.

    pdf72p xunu1311 02-11-2012 8 1   Download

  • The EF-hand protein S100A2 is a cell cycle regulator involved in tumori-genesis, acting through regulation of the p53 activation state. Metal ion-free S100A2 is homodimeric and contains two Ca 2+ -binding sites and two Zn 2+ -binding sites per subunit, whereby the Zn 2+ ion binding to one of the sites is coordinated by residues from two homodimers.

    pdf11p vinaphone15 27-02-2013 12 1   Download

  • Thông thường lớp cách điện được dùng là lớp oxit nên còn gọi là metal - oxide - semiconductor transistor (viết tắt là MOSFET).Transistor hiệu ứng trường (Field Effect Transistor - FET): JFET: Junction FET; MOSFET: Metal - Oxid Semiconductor FET (Insulated - Gate - IGFET) Tính chất (Phân biệt với BJT); Nhạy với điện áp; Trở kháng...

    ppt56p son2483 12-11-2010 819 279   Download

  • Giới thiệu: Transistor hiệu ứng trường (Field Effect Transistor - FET): JFET: Junction FET; MOSFET: Metal - Oxid Semiconductor FET (Insulated - Gate - IGFET) Tính chất (Phân biệt với BJT); Nhạy với điện áp; Trở kháng vào rất cao

    pdf13p doanhuan87 17-05-2010 681 232   Download

Đồng bộ tài khoản