Materials Literature
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The charge‐discharge capability of a polymer composite cathode prepared from 2,5‐dimercapto‐1,3,4‐thiadiazole (DMcT), polyaniline, S‐alkylcarboxylate‐4‐methylpyrrole, and acetylene black has been investigated on different kinds of current collectors including copper, nickel, aluminum, and titanium foil, gold‐plated ti…
Pyrococcus furiosus is a strictly anaerobic archaeon (archaebacterium) that grows at temperatures up to 105 degrees C by fermenting carbohydrates and peptides. Cell extracts have been previously shown to contain an unusual acetyl coenzyme A (acetyl-CoA) synthetase (ACS) which catalyzes the formation of acetate and ATP…
Variable‐temperature Raman spectroscopy showed that, in progressively finer BaTiO 3 powders, the Curie point increased as the room temperature tetragonality decreased. The influence of crystallite size distribution on the range of tetragonalities present in a powder was clearly evident in both phase transitions, as ob…
We study a class of models for brittle fracture: elastic theory models which allow for cracks but not for plastic flow. We show that these models exhibit, at all finite temperatures, a transition to fracture under applied load similar to that at a first order liquid-gas transition. We study this transition at low temp…
We present a model for thin film growth by particle deposition that takes into account the possible evaporation of the particles deposited on the surface. Our model focuses on the formation of two-dimensional structures. We find that the presence of evaporation can dramatically affect the growth kinetics of the film,…
Infrared emission at 1.8, 2.9, and 4.3 microm is measured in dysprosium-doped gallium lanthanum sulfide (Ga:La:S) glass excited at 815 nm. Emission cross sections were calculated by Judd-Ofelt analysis, the Füchtbauer- Ladenburg equation, and the theory of McCumber. The sigmatau value for the 4.3-microm transition is…
We previously demonstrated that ultraviolet (UV) or dehydrothermal (DHT) crosslinking partially denatured fibers extruded from an insoluble type I collagen dispersion. In this study denaturation effects were evaluated by measuring collagen-fiber sensitivity to trypsin. Shrinkage-temperature measurements and sensitivit…
The methylcellulose was mixed with chitosan as well as 4% of sodium benzoate or potassium sorbate to form a film. Investigations of the antimycotic activity of the film on Penicillium notatum and Rhodotorula rubra revealed that it possessed significant antifungal properties. At 25C, approximately 43–45% of the preserv…
The rigid-unit mode model provides many new insights into the stability and physical properties of framework silicates. In this model the SiOo and AlO4 tetrahedra are treated as very stifl to a first approximation as completely rigid, in comparison with intertetrahedral forces. In this paper we apply the model to seve…
We present transport and neutron-diffraction data establishing a clear link between static and dynamic distortions of the ${\mathrm{MnO}}_{6}$ octahedra and charge mobility in ${\mathit{A}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$A${\ensuremath{'}}_{\mathit{x}}$ ${\mathrm{MnO}}_{3}$ (A=La or Pr; ${\mathit{A}}^{\ensuremat…
Dendrimers and hyperbranched polymers are globular macromolecules that are characterized both by a highly branched structure, in which all bonds converge to a focal point or core, and a multiplicity of reactive chain-ends. Because of the obvious similarity of their building blocks, many assume that the properties of t…
The effective medium theory of one-dimensional and two-dimensional periodic structures are investigated. A method based on a Fourier decomposition of the wave propagating along the direction perpendicular to the periodic structures allows one to determine the zeroth-, first- and second-order effective indices. For one…
Crystallization is necessary to obtain the three-dimensional structure of proteins and nucleic acids; it often represents the bottleneck in structure determination. Our understanding of crystallization mechanisms is still incomplete. In this review, we emphasize fundamental aspects of the crystallization process. Prot…
Cellulose is one of the major commercial products of Sweden and constitutes the most abundant of the natural polymer systems. Thus, it is of interest to review the molecular design and architecture of cellulose with particular reference to the controls of its biosynthesis. The bioassembly process is highly ordered and…
Other| October 01, 1996 Optimizing the electron microprobe analysis of hydrous alkali aluminosilicate glasses George B. Morgan; George B. Morgan University of Oklahoma, Electron Microprobe Laboratory, Norman, OK, United States Search for other works by this author on: GSW Google Scholar David London David London Searc…
Abstract The dehydroxylation of a series of the kaolinite clay minerals, kaolinite, halloysite and dickite, has been investigated by Fourier transform in situ infrared emission spectroscopy over a temperature range of 100 to 800°C at both 50 and 5° intervals. Excellent correspondence was obtained between the high temp…
The proceedings include all the technical papers presented at the 15th International Conference on Thermoelectrics, held on 26-29 March 1996 at Pasadena, California, USA. There were 10 invited presentations and over 110 regular presentations in this conference. The presentations were made in 20 technical sessions and…
Abstract Poly(lactide)s (PLA) with different optical purities (OP) were synthesized by copolymerization of D‐lactide and L‐lactide. Crystallization of D‐ and L‐lactide‐rich copolymers before and after 1 : 1 blending was studied from the melt over a wide range of annealing temperatures (T a ) using differential scannin…
The fundamentals of wetting and wicking are reviewed. Wetting is the displacement of a fiber-air interface with a fiber-liquid interface. Wicking is the spontaneous flow of a liquid in a porous substrate, driven by capillary forces. Because capillary forces are caused by wetting, wicking is a result of spontaneous wet…
Manganese ferrite, ${\mathrm{MnFe}}_{2}$${\mathrm{O}}_{4}$, fine particles in the size range 5--15 nm have been prepared by an aqueous phase coprecipitation method. The freshly prepared particles are in a metastable state with regard to the cation distribution between the A and B sites of the spinel lattice. Thermomag…