Xem 1-20 trên 46 kết quả Metal complexes
  • A central metal atom bonded to a group of molecules or ions is a metal complex. • If it’s charged, it’s a complex ion. Chemistry • Compounds containing complexes are coordination of Coordination Compounds compounds.The molecules or ions coordinating to the metal are the ligands.

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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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  • 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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  • We studied the interaction of several metal ions with the copper chaperone fromEnterococcus hirae(EhCopZ). We show that the stoichiometry of the protein–metal complex varies with the experimental conditions used. At high con-centration of the protein in a noncoordinatingbuffer, a dimer, (EhCopZ)2–metal, was formed. The presence of a potentially coordinatingmolecule L in the solution leads to the formation of a monomeric ternary complex, EhCopZ– Cu–L, where L can be a buffer or a coordinatingmole-cule (glutathione, tris(2-carboxyethyl)phosphine). ...

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  • Hydrogenation is one of the most intensively studied fields of metal complex catalyzed homogeneous transformations. There are several reasons for such a strong interest in this reaction. First of all, there are numerous important compounds which can be produced through hydrogenation, such as pharmaceuticals, herbicides, flavors, fragrances, etc [1-3]. Activation of is involved in other important industrial processes, such as hydroformylation, therefore the mechanistic conclusions drawn from hydrogenation studies can be relevant in those fields, as well.

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  • Solubility of the catalysts in water is determined by their overall hydrophilic nature which may arise either as a consequence of the charge of the complex ion as a whole, or may be due to the good solubility of the ligands. Although transition metal complexes with small ionic ligands, such as halides, pseudohalides or simple carboxylates can be useful for specific reactions the possibility of the variation of such ligands is very limited. As in organometallic catalysis in general, phosphines play a leading role in aqueous organometallic catalysis (AOC), too.

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  • Sintering refers to the science and technology of production objects from fines or powders. Being a very complex phenomenon, sintering covers a broad subject field and combines chemistry, physics and mechanics. Sintering deals with various material systems such as metals, non-metals, ceramics, polymers, and their combinations. Processes of sintering may occur in a wide temperature range - in a solid state as well as with participation of a liquid phase.

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  • The technique can be applied for chlorophyll level monitoring in basic photosynthesis research, agriculture, horticulture, and forestry. Abiotic stress (water deficit, salinity, heat, heavy metals soil contamination, intense light, etc) affects significantly crop growth and yield in agricultural areas all over the world. Thus, it is imperative to study their effect upon the crops and discriminate among abiotic stresses using new noninvasive and nondestructive remote sensing precision diagnostic techniques.

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  • American Welding Society Vice President Jerry Uttrachi is a master welder and he reveals all major welding processes and techniques, so you can repair and fabricate using advanced materials and complete complex projects. TIG, MIG, oxy-acetylene, and stick welding techniques are illustrated for a wide range of automotive applications. Uttrachi details how to make a butt joint, single pass butt, double pass butt, joggle joint, lap joint welds, and numerous other varieties of joint welds.

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  • Today, greater emphasis is being placed on a component’s ‘machinability’ , but this term is an ambiguous one, having a variety of different meanings, depending upon the production engineer’s requirements. In fact, the machinability expression does not have an authoritative definition, despite the fact that it has been used for decades. In 1938, Ernst in his book on the ‘Physics of Metal Cutting’ , defined machinability in the following manner: ‘As a complex physical property of a metal...

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  • Science seeks to understand and explain our world, be that its physical composition (geology), chemical composition (chemistry), the way its composite matter interacts (physics), or the organisms that inhabit it (biology). We can only get an idea of what life is all about by piecing together information from each discipline to give us the big picture. We don’t have to look very far to realize that it is difficult, if not impossible, to separate biology from chemistry. After all, our body is a bag of chemicals.

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  • Once the damaged area was located with AE, many local track The method is often used to further assess the damage and mapping. In contrast to the assessment of buildings and bridges, detailed calculations of the whole structure is generally not part of load and standardized assessment procedures. Similar procedures have been developed AE for other equipment such as manlifts coincidence (Ternowchek and Mitchell, 1992, Pollock and Ternowcheck, 1992); metal rail cars and other vessels (AAR, 1999; AAR, 2002; Fowler et al, 1989)....

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  • The real estate impact of arts and cultural activities is seen not only in the redevelopment of discrete buildings, but in the incremental renewal of large districts involving complex social and design solutions. The physical expression of place-making by the creative sector often plays out over decades. Older urban neighborhoods are filled with architecturally- distinct buildings that exist in the interplay of recently re-built and longer term deteriorated sites.

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  • Mining wastes can cause significant ecological destruction. Often, solid mine wastes are dumped into streams, destroying habitat and causing siltation and heavy metal and other contamination. Even when such wastes are stored out of water channels, trace materials can leach into surface waters and infiltrate into local groundwater. Fine- grained tailings can wash into local waterways and degrade streams by covering and filling coarser-grained substrates.

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  • There must have been at least a dozen of them that I made-more or less complex....The White Sun at Princeton is one of the other studies that I made. This was carved by me in Italy at the same time that I made on somewhat different version of the study which is at the National Collection of Fine Arts in Washington [National Museum of American Art]...in gray marble...One [other study]...is in front of the Seattle Art Museum and was carved in black Brazilian granite in Japan. It has been my conceit to think that I have spanned the continent with a giant White Sun in the East and Black...

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  • If the dent is very small or shallow, it may well be easier to simply carry out the repair with only bodyfiller without restoring the metal surface. Remember, bodyfiller applied in thick layers is not as flexible as the metalwork, leading to cracks and other problems especially near panel edges or on unsupported areas. Avoid deep filling on flexible panels. Assess the extent of metal damage first to make sure it really is repairable, otherwise consider panel replacement or professional help.

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  • The scientific evidence is now overwhelming: climate change presents very serious global risks, and it demands an urgent global response. This independent Review was commissioned by the Chancellor of the Exchequer, reporting to both the Chancellor and to the Prime Minister, as a contribution to assessing the evidence and building understanding of the economics of climate change. The Review first examines the evidence on the economic impacts of climate change itself, and explores the economics of stabilising greenhouse gases in the atmosphere.

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  • Mercury has a number of unique and fascinating properties. It is the only metal that, in its pure form, is a liquid at room temperature. Liquid mercury is volatile, meaning that it evaporates easily to form a poisonous vapour. Mercury conducts electricity and expands at a constant rate in response to changes in pressure or temperature. Electrical switches, barometers and thermometers take advantage of these properties.

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  • Gamma uses traditional relational techniques for query parsing, optimization [SELI79, JARK84], and code generation. The optimization process is somewhat simplified as Gamma only employs hash-based algorithms for joins and other complex operations. Queries are compiled into a left-deep tree of operators. At execution time, each operator is executed by one or more operator processes at each participating site.

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  • A comparative study of thermodynamic and kinetic aspects of Cu(II) and Ni(II) binding at the N-terminal binding site of human and bovine serum albumins (HSA and BSA, respectively) and short peptide analogues was performed using potentiometry and spectroscopic techniques. It was found that while qualitative aspects of interaction (spectra and structures of complexes, order of reactions) could be reproduced, the quantitative parameters (stability and rate constants) could not.

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