Materials Literature
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Abstract The harmonic balance method is a technique for the numerical solution of nonlinear analog circuits operating in a periodic, or quasi‐periodic, steady‐state regime. The method can be used to efficiently derive the continuous‐wave response of numerous nonlinear microwave components including amplifiers, mixers,…
An approach to molecular wires based on quasi-one-dimensional linearly conjugated poly-porphyrin systems is outlined and a rationally designed synthesis of the tetrakisporphyrin 9, a strand some 65 Å in length, via the bis(porphyrin)tetraone 2 is described.
The author presents a bibliography and survey of the literature concerned with theory and measurement of the stochastic behavior of pulsating partial-discharge (PD) phenomena that can occur when insulation is subjected to electrical stress. The types of PD phenomena considered include AC and DC generated electron aval…
Erbium-doped fiber has become the central component of nearly all optical amplifiers. Applications reported include repeaters, power amplifiers, preamplifiers, and distributed amplifiers. To date, nearly all the fiber used in these devices has been silica based and fabricated by variations on the major telecommunicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced electron transfer in the solid state: rate vs. free energy dependence in fixed-distance porphyrin-acceptor moleculesGeorge L. Gaines III, Michael P. O'Neil, Walter A. Svec, Mark P. Niemczyk, and Michael R. WasielewskiCite this: J. Am. Chem. Soc. 1991, 113, 2, 71…
The journal consistently attracts the most important and highly innovative papers from the current research; our commitment to rapid publication ensures that these are published in the fastest time possible. In addition to primary papers from world-renowned experts, the Journal contains authoritative reviews that summ…
Thermodynamics and phase diagrams of materials, A.D.Pelton diffusion in crystalline solids, G.E.Murch statistical theories of phase transitions, K.Binder homogeneous second phase precipitation, R.Wagner transformations involving interfacial diffusion, G.R.Purdy diffusionless transformations, L.Delaey spinodal decompos…
Polyhydroxyalkanoic acids (PHA) are water-insoluble polyesters of alkanoic acids containing a hydroxyl group as at least one functional group in addition to the carboxy group, and possess the general formula shown in Fig. 1. Although some of these polymers are also available from chemical synthesis, many of them are s…
Chirality has become arguably the most important and complex topic of research in liquid crystals today. The reduced symmetry in these organized phases leads to a variety of novel phase structures, properties, and applications. Molecular asymmetry imparts form chirality to liquid-crystalline phases, which is manifeste…
The free-base octabromotetraphenylporphyrin (H2OBP) has been prepared by a novel bromination reaction of (meso-tetraphenylporphyrinato)copper(II). The metal [V(IV)O, Co(II), Ni(II), Cu(II), Zn(II), Pd(II), Ag(II), Pt(II)] derivatives exhibit interesting electronic spectral features and electrochemical redox properties…
The aim of the present study was to investigate whether angiotensin II, by increasing extracellular matrix synthesis, contributed to the vascular wall thickening observed in hypertension. Thus, we examined the direct effects of angiotensin II on collagen and fibronectin synthesis in cultured rat vascular smooth muscle…
The structure of pressure-densified vitreous ${\mathrm{SiO}}_{2}$ has been investigated using neutron-diffraction and molecular-dynamics techniques. After compression to 16 GPa at room temperature, recovered samples have densities 20% higher than normal vitreous ${\mathrm{SiO}}_{2}$ and show substantial changes in the…
The sol–gel process enables on to prepare oxide glasses at room temperature with little or no heating. By using this method, it is possible to encapsulate a wide variety of organic and organometallic molecules in the inorganic matrix. Studies of this new type of organic/inorganic composite have evolved towards two dif…
Part I: 1. The structure of simple liquids (I. McDonald). 2. Statistical mechanics of cellular automata fluids (M.H. Ernst). 3. Crystallization of liquids: a density functional approach (D. Oxtoby). 4. Theory of quantum processes in liquids (D. Chandler). 5. Aspects of structural glass transitions (W. Gotze). Part II:…
(1991). NEW MATERIALS BY MECHANICAL ALLOYING TECHNIQUES. Materials and Manufacturing Processes: Vol. 6, No. 4, pp. 733-736.
M. R. Bryce, Chem. Soc. Rev., 1991, 20, 355 DOI: 10.1039/CS9912000355
Hydrogen diffusivity and solubility in pure solid aluminum were measured in a high temperature range from 573 to 923 K, by means of a desorption technique, which was an outgassing study from thermally hydrogen-charged cylindrical samples with various grain sizes. The diffusion coefficient depended linearly upon an inv…
Abstract
Abstract The solubilization of silicates was investigated using kaolin and quartz sand as model substances. The mineral solubilization was studied in the concentration of solubilized Si and Al. The chemical leaching of the silicates was carried out using inorganic and organic acids as well as sodium hydroxide. The pro…
Poisson's ratio of cow teat skin was measured uni- and biaxially and shown to be anisotropic and dependent on aspect ratio. At strains below 0.1 (where Cauchy and Hencky strain are indistinguishable) the Poisson's ratio of cow teat skin measured biaxially is very much greater than 1.0, whereas the Poisson's ratio of d…