Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract A calcium‐binding phosphoprotein has been isolated from the extrapallial fluid of clams where it occurs as discrete particles 30–40 nm in diameter at a concentration of 1.5–6.0 mM with respect to organic phosphate. The particles were isolated by nitration and differential centrifugation procedures. In particl…
The dielectric constant tris-sarcosine calcium chloride [${(\mathrm{C}{\mathrm{H}}_{3}\ensuremath{-}\mathrm{N}\mathrm{H}\ensuremath{-}\mathrm{C}{\mathrm{H}}_{2}\ensuremath{-}\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H})}_{3}$\ifmmode\cdot\else\textperiodcentered\fi{}Ca${\mathrm{Cl}}_{2}$] has been measured with a relative…
A mathematical model for the initiation of crevice corrosion was developed based on the hypothesis that, for Al in , initiation occurs when the concentration of dissolved metal exceeds a certain minimum critical value. This hypothesis was tested experimentally in the preceding qualitative paper. The model accounts for…
The molecular structures of the amorphous films formed on pure aluminium by anodic oxidation in sodium tartrate and phosphoric acid electrolytes, which are known to give quite different oxide morphologies, have been investigated using the technique of electron-yield EXAFS. The Al-0 ‘bond length’ derived from the EXAFS…
The toughening induced by monoclinic ZrO 2 in the absence of microcracking was investigated, using ZnO as the host material. Toughness levels K c in excess of the host toughness K c M were achieved, attaining a peak toughness K c /K c M ∼1.7, at monoclinic ZrO 2 volume concentrations 0.2. This toughening is attributed…
We present calculations (1) of the climb and glide velocities of edge dislocations in layered structures having the characteristics of smectic liquid crystals (equi-valently Rayleigh-Bénard rolls with froe slip-boundary conditions), (2) of Rayleigh-Bénard rolls with rigid boundary conditions and (3) of the nematic ell…
Electrochemical hydrogen permeation experiments were performed on polycrystalline nickel and nickel-base alloys in order to study the factors affecting the entry and transport of hydrogen in such materials. The diffusivity of hydrogen is found to be dependent upon alloy composition, prior cold work, and the concentrat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed-metal face-to-face porphyrin dimersJames P. Collman, C. Susana Bencosme, Richard R. Durand Jr., Robert P. Kreh, and Fred C. AnsonCite this: J. Am. Chem. Soc. 1983, 105, 9, 2699–2703Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Publis…
The IR spectra of meso-tetraphenylporphine (TPP) dissolved in CCl4 have been measured in the NH and ND stretching band region as a function of isotopic substitution using a newly constructed vacuum IR cell. Thus, it was possible for the first time to localize the NH and ND stretching bands of TPP–HD, which are charact…
Nonlinear elasticity in proper ferroelastics is investigated using the Landau theory of phase transitions. In proper ferroelastics, where certain combinations of strain components ${e}_{s}$ correspond to the order parameter, coefficients in the Landau free energy are found to coincide with special combinations of elas…
Electrochemical oxidation of azulene in acetonitrile containing an appropriate electrolyte yields thick, electrically conducting polymeric films. Free-standing films of polyazulene peeled off a platinum electrode have electrical conductivities [sgrave]=10−2 to 1/Ω·cm, depending on the counter-anion, with perchlorate o…
High-resolution ac calorimetric measurements have been made on $\mathrm{azoxy}\ensuremath{-}4,{4}^{\ensuremath{'}}\ensuremath{-}\mathrm{di}\ensuremath{-}\mathrm{undecyl}\ensuremath{-}\ensuremath{\alpha}\ensuremath{-}\mathrm{methylcinnamate}$ (AMC-11), butyloxybenzylidene heptylaniline (4O.7), heptyloxybenzylidene hexy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBranch structures in poly(vinyl chloride) and the mechanism of chain transfer to monomer during vinyl chloride polymerizationW. H. Starnes Jr., Frederic C. Schilling, I. M. Plitz, Rudolf E. Cais, D. J. Freed, R. L. Hartless, and Frank A. BoveyCite this: Macromolecules 1983,…
A Schottky type diode has been constructed with the electrochemically prepared copolymer having pyrrole and N-methylpyrrole units and a low work function metal (In). The heat treatment of the copolymer in air was performed in order to stabilize the electrical characteristics of the device before the deposition of a bl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible oxidation and rereduction of entire thin films of transition-metal phthalocyaninesJ. Mark Green and Larry R. FaulknerCite this: J. Am. Chem. Soc. 1983, 105, 10, 2950–2955Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published in…
Valence effective Hamiltonian (VEH) calculations are performed on a number of sulfur containing organic conjugated polymers of interest to the conducting polymers area. Theoretical results for parameters related to conductivity such as ionization potentials, bandwidths, and bandgaps are presented. Systems considered i…
The structure of ribonuclease A has been refined jointly with the neutron and X-ray data extending to 2.0 A. The results of an earlier X-ray refinement provided the starting model [Wlodawer, A., Bott, R., & Sjölin, L. (1982) J. Biol. Chem. 257, 1325-1332]. The final R factors were 0.159 (X-ray) and 0.183 (neutron) for…
Protein C activation is catalyzed by a complex between thrombin and an endothelial cell surface receptor, thrombomodulin.To investigate the function of the y-carboxyglutamic acid (Gla) residues in the calciumdependent activation of protein C, residues 1-41 were removed from the protein C light chain by selective prote…
关于钾芒硝(Glaserite)的组成和性质,曾有过许多研究,但一直存在着争论. 五十年代以来,各研究者的分歧仍然很大,Frondel给出钾芒硝的化学式为(K,Na)_3Na(SO_4)_2,Winckell认为钾芒硝是一种复盐而不是固溶体,等在研究55℃K_2SO_4-Na_2SO_4-H_2O三元体系时,认为存在着一种富含K_2SO_4的新相,摩尔比K∶Na达3.20—3.60. 等研究75℃上述三元系时,也做出了摩尔比高达3.73的固相,等研究100℃的三元系时,认为存在着固定组成为K_3Na(SO_4)_2的结晶区,同时还有K_3Na(SO_4)_2和Na_2SO_4单方向的固溶体. 总之,没有做出最终的结论.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMethyl-substituted tribenzo[b,f,j][1,5,9]triazacycloduodecine with copper(II) ion: a dynamic Jahn-Teller effectRobert I. Sheldon, Alan J. Jircitano, Mark A. Beno, Jack M. Williams, and Kristin Bowman MertesCite this: J. Am. Chem. Soc. 1983, 105, 10, 3028–3031Publication Date…