Influence of compressive stress on magnetic properties of commercial
Magnetic properties of several batches of commercial
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Analysis of Effect of Heat‐Transfer Variables on Thermal Stress Resistance of Brittle Ceramics Measured by Quenching Experiments
Heat‐transfer theory was used to analyze the variables which control the thermal stress fracture of brittle ceramic specimens subjected to rapid cooling by quenching into fluid media. Expressions were derived for the maximum quenching temperature difference to which circular solid cylindrical specimens can be subjecte…
Reprocessing of thermoplastics. II. Polycarbonate
Abstract The effect of recycling on the properties of injection molded polycarbonate was investigated. One unreinforced and two glass‐reinforced grades were studied. Fiber degradation was distinguished from molecular scission by spiral flow measurements and molecular weight analysis. During the first cycles the averag…
Nematic liquid crystals in high magnetic field: Quenching of the transverse fluctuations
The partial quenching of the fluctuations of orientation of nematic layers by very large magnetic fields predicted by de Gennes and leading to increased birefringence has received a first experimental verification by Poggi and Filippini. In this paper a detailed account of this effect is given: the progressive disappe…
Cell Surface Measurements in Hydrocarbon and Carbohydrate Fermentations
Acinetobacter calcoaceticus was grown in 11-liter batch fermentations with hexadecane or sodium citrate as the sole source of carbon. Surface and interfacial tension measurements of the microbial broth indicated that surface-active compounds were being produced only during growth on the hydrocarbon substrate. Contact…
Macroions and Macroion Pairs in the Anionic Polymerization of β-Propiolactone (β-PL)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacroions and Macroion Pairs in the Anionic Polymerization of β-Propiolactone (β-PL)Stanislaw Slomkowski and Stanislaw PenczekCite this: Macromolecules 1980, 13, 2, 229–233Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue 1…
Sub-part-per-billion determination of total dissolved selenium and selenite in environmental waters by x-ray fluorescence spectrometry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSub-part-per-billion determination of total dissolved selenium and selenite in environmental waters by x-ray fluorescence spectrometryHarry J. Robberecht and Rene E. Van GriekenCite this: Anal. Chem. 1980, 52, 3, 449–453Publication Date (Print):March 1, 1980Publication Histo…
Electron Mean Free Paths in Solid Organic Insulators
A simple expression is presented which can be used to estimate the mean free paths of electrons in solid organic insulators as a function of the electon energy. Input parameters are the molecular weight and the density of the organic sample. The range of validity is 100 eV to 10 keV. It is demonstrated that, for this…
Analysis of the Exciton Luminescence of Silicon for Characterization of the Content of Impurities
The low-temperature exciton luminescence of silicon has been measured and analyzed on the basis of rate equations describing the formation and decay kinetics of free exciton, bound exciton and bound multiexciton complexes. In particular, the excitation-level and impurity-concentration dependences of the luminescence-i…
Nonlinear elasticity of rodlike macromolecules in condensed state
Abstract The finite deformation elasticity of gels of stiff rodlike polymer chains is discussed theoretically. Unlike a rubber composed of flexible polymer chains, the elasticity of this system is energetic, and arises from the elastic deformation of the stiff chains which are forced to bend under macroscopic strain.…
Functional metal‐porphyrazine derivatives and their polymers, 3. Catalytic activity of Fe(III)‐3,4,3′,4′,3″,4″,3″′,4″′‐octacarboxyphthalocyanine for decomposition of hydrogen peroxide
Abstract The decomposition reaction of hydrogen peroxide was carried out by using Fe(III)‐3,4,3′,4′,3″,4″,3″′,4″′‐octacarboxyphthalocyanine (Fe(III)‐oaPc) as a catalyst, which has previously been reported by Boston et al. Fe(III)‐oaPc is a remarkably effective catalyst for the reaction, compared with hemin, other meta…
Singlet Electronic Energy Transfer in Polymers Containing Naphthalene and Anthracene Chromophores
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet Electronic Energy Transfer in Polymers Containing Naphthalene and Anthracene ChromophoresD. A. Holden and J. E. GuilletCite this: Macromolecules 1980, 13, 2, 289–295Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Published inissue…
Spectroscopy of high-frequency phonons
It has recently become possible to observe experimentally the spectral, spatial and temporal evolution of non-equilibrium phonon distributions in solids. The author reviews those techniques which are applicable to high-frequency (>or approximately=200 GHz) phonon propagation. Each technique is analysed for the physica…
Ionization of the Catalytic Groups and Tyrosyl Residues in Human Lysozyme1
The pH difference absorption spectra of human lysozyme [EC 3.2.1.17] were measured. The difference spectra in the acidic region had a peak at 300 nm, as observed for hen and turkey lysozymes. The pH dependence curve of the extinction difference at 300 nm was well interpreted in terms of the pK values of the catalytic…
A Monte Carlo simulation of the diffusion of gases in porous solids
A Monte Carlo simulation of the Knudsen diffusion of gases in a porous solid is described and results of such simulations presented. The solid was represented in the computer as an assemblage of spheres. Equations are presented which enable the prediction of a Knudsen diffusivity from the mean pore size (or, preferabl…
Induced crystallization of glass-forming systems: A case of transient heterogeneous nucleation, part 1.
Glass-ceramics which have played an ever increasing role in science and technology in the last two decades are the most widely used representative of a new type of partly crystalline or semi-amorphous materials. They can be prepared by induced crystallization of glass-forming melts. This article, which is in two parts…
The water–water pair potential near the hydrogen bonded equilibrium configuration
An analysis is presented of the contributions to the potential energy of interaction between water molecules near the hydrogen bonded equilibrium configuration. From this analysis we synthesize an effective potential that includes the influences of long-ranged and nonadditive interactions. The influence of the hydroge…
Factors Affecting the Electrochemical Responses of Metal Complexes at Pyrolytic Graphite Electrodes Coated with Films of Poly(4‐Vinylpyridine)
Electrochemical responses from the reduction of Ru III (edta) coordinated to films of high molecular weight poly(4‐vinylpyridine) on pyrolytic graphite electrodes were studied as functions of film thickness, temperature, supporting electrolyte composition, and solvent. Responses at filmed electrodes from metal complex…
The influence of oxygen pressure on lead oxidation kinetics
The dependence of the oxidation rate of lead films on the pressure of oxygen was investigated by ellipsometric and resistance techniques for oxygen pressures between 200 Pa and 100 kPa and in the temperature range 323-423 K. Measurements of the pressure dependence were obtained by studying the change in oxidation rate…
Time resolved cathodoluminescence in the scanning electron microscope by use of the streak technique
SUMMARY Minority carrier lifetime is one of the basic material properties in optoelectronic devices and material. Both the micrometer range dimensions of the devices and lifetime variations around defects in materials require a lifetime measurement technique with both high spatial and high temporal resolution. In orde…