Results 231 to 240 of about 30,626 (294)
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The nonmetallicity of molybdenum clusters
The Journal of Chemical Physics, 2004Molybdenum clusters consisting of 2–55 atoms were investigated using density functional theory calculations with a plane-wave basis set. The results show that the linear and planar molybdenum clusters have a strong tendency to form dimers. This tendency results in the formation of alternate short and long bonds within a linear cluster, in which the ...
Wenqin, Zhang +3 more
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Nonrenewable Resources, 1996
The first factor determining recyclability is the composition of the material itself. Metals, for example, can be reused with little or no loss in quality. Paper and rubber, by this criterion, are less recyclable. Each time paper is recycled, some cellulose fibers are broken.
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The first factor determining recyclability is the composition of the material itself. Metals, for example, can be reused with little or no loss in quality. Paper and rubber, by this criterion, are less recyclable. Each time paper is recycled, some cellulose fibers are broken.
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2021
The rules for nonmetallic piping and piping lined with nonmetals are given in Chapter VII of ASME B31.3. The paragraphs in that chapter follow the same numbering as the base Code, Chapters I through VII, but start with the letter A. If requirements located elsewhere in the Code apply to these piping systems, they are referenced by a paragraph in ...
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The rules for nonmetallic piping and piping lined with nonmetals are given in Chapter VII of ASME B31.3. The paragraphs in that chapter follow the same numbering as the base Code, Chapters I through VII, but start with the letter A. If requirements located elsewhere in the Code apply to these piping systems, they are referenced by a paragraph in ...
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Classification of the nonmetallics
Economic Geology, 1959A rational classification is a prerequisite for the systematic study of the geology of the nonmetallics. Neither the conventional treatment of the subject in standard references, nor a strictly genetic classification, is considered satisfactory for this purpose, Several criteria, primarily economic, are set forth, by which the nonmetallics are ...
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Splendid Isolation for a Nonmetallic Dication
Angewandte Chemie International Edition, 2009AbstractConfined, but happy: The triflate salt of a germanium(II) dication, an atomic cation of a nonmetal, was isolated by encapsulation in [2.2.2]cryptand (see formula and molecular structure in the crystal). The cryptand satisfies the electron demand of the cation and sterically protects it (see space‐filling depiction, right).magnified ...
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2017
Nonmetallic flexible loom is recommended for use as an insulated covering giving mechanical protection over insulated wire, metal tubing, or other parts requiring a water-, oil-, and acid-proof covering resistant to fire or abrasion. It is also recommended for use as a covering for copper or other metal tubing to prevent crystallization and to ...
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Nonmetallic flexible loom is recommended for use as an insulated covering giving mechanical protection over insulated wire, metal tubing, or other parts requiring a water-, oil-, and acid-proof covering resistant to fire or abrasion. It is also recommended for use as a covering for copper or other metal tubing to prevent crystallization and to ...
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Bipolarons in nonmetallic crystals
Journal of Structural Chemistry, 1986The binding energy of a bipolaron in an ionic crystal increases substantially in the case of strong anisotropy of the effective masses of the free carriers of the easy plane type or easy axis type. In the second case the polaron is cigar-like in shape and the coaxial configuration of bipolarons is energetically favorable.
V. L. Vinetskii +2 more
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Physics, 1934
Immutable conducting films, which adhere to any clean solid have been formed from synthetic resin solutions holding finely ground carbon in suspension. Values of surface resistivity for uniformly thin films were secured in the range 15 to 106 ohms referred to unit area of surface. When the thickness is held constant, the resistivity depends mainly upon
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Immutable conducting films, which adhere to any clean solid have been formed from synthetic resin solutions holding finely ground carbon in suspension. Values of surface resistivity for uniformly thin films were secured in the range 15 to 106 ohms referred to unit area of surface. When the thickness is held constant, the resistivity depends mainly upon
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Fields in Nonmetallic Waveguides
Proceedings of the IRE, 1948An infinite plate of dielectric material is taken as the prototype of nonmetallic waveguides. The Green's function is found for the case in which the electric field is parallel to the surfaces of the plate. The solution is set up as a Fourier integral, which is then replaced by a complex contour integral.
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Reaction of Compounds of the Nonmetallic Elements
1983The pyrolysis of the boranes is a topic of continuing interest. Lipscomb et al. (1) have published calculations that cast doubt on the long-held view that in the pyrolysis of diborane the decomposition of B3H9 an adduct of BH3 and B2H6 is a rate-determining stage.
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