Materials Literature
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Insulin has been encapsulated in biodegradable polylactic acid microcapsules and non-biodegradable ethylcellulose microcapsules by using an emulsification-solvent evaporation process. Gelatin and polyvinylalcohol were used as protective colloids. The concentrations and types of protective colloids affecting the microm…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanisms of epoxidation during ozonation of carbon-carbon double bondsPhilip S. Bailey, Hank H. Hwang, and Chin Yun ChiangCite this: J. Org. Chem. 1985, 50, 2, 231–234Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue 1…
The study of polymer degradation and stabilisation is of considerable practical importance as the industrial uses of polymeric materials continue to expand. In this book, the authors lucidly relate technological phenomena to the chemistry and physics of degradation and stabilisation processes. Degradation embraces a v…
Description Two volumes present recent research on radiation damage to structural materials in both fission and fusion environments. Seventy papers discuss: irradiation creep of structural metals; microstructural development; neutron-induced swelling; charge particle irradiation; theory of swelling; mechanical propert…
Кооперативные явления РІ кристаллах СЃ нецентральными ионами — дипольное стекло Рё сегнетоэлектричество, Вугмейстер Р‘.Р•., Глинчук Рњ.Р”.
Silicon carbide ceramics with BeO as an additive exhibit unusually high electrical resistivity and thermal conductivity compared to conventional SiC ceramics. Studies concerning the effects of carrier concentration in the SiC grains on electrical properties and thermal conductivity are described. The low carrier conce…
Preface RADIATION ROUND-UP: Introductory Aspects of Radiation Basic Concepts of Radiation Physics and Dosimetric Units IONIZATION METHODS: Ionization Chamber Dosimetry Semiconductor-Junction Dosimetry Ion Implantation Dosimetry THERMAL METHODS: Thermoluminescence Dosimetry Thermally Stimulated Conductivity (TSC) Dosim…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAccuracy of transmission electron microscopy for the analysis of asbestos in ambient environmentsEric B. Steel and John A. SmallCite this: Anal. Chem. 1985, 57, 1, 209–213Publication Date (Print):January 1, 1985Publication History Published online1 May 2002Published inissue…
The crystal and molecular structures of (3-N,N-dimethylamino-1-propanolato) isocyanatocopper(II)(1), (3-N,N-dimethylamino-1-propanolato) isothiocyanatocopper(II)(2), (3-N,N-diethylamino-1-propanolato) isothiocyanatocopper(II)(3), and (3-N,N-di-n-butylamino-1-propanolato)isothiocyanatocopper(II)(4) have been determined…
In eubacteria and eukaryotes, citrate synthase and succinate thiokinase exhibit a species‐dependent diversity of structure, activity and regulation. These enzymes have now been examined in the archaebacteria and it is found that each of the three major subgroups, the extreme halophiles, the thermoacidophiles and the m…
High-resolution adiabatic calorimetry has been used for the study of the nature of the NAC (nematic-smectic A-smectic C) multicritical point in the mixture of 4-n-hexyloxyphenyl-4'-n-octyloxybenzoate (608) and 4-n-hexyloxyphenyl-4'-n-decyloxybenzoate (6010). The N-C transitions are weak first order however the transit…
Abstract Rock samples representing different soil parent materials from the Jurassic, Cretaceous and Tertiary periods in eastern Saudi Arabia were investigated for their mineralogical and chemical properties. Samples from five soil profiles found on these rocks also were studied. Palygorskite was found to be the domin…
Two experimental determinations of W, the average energy required to produce an ion pair in dry air, for electrons arising from 60 Co radiation, are presented. One is based on calorimetric and ionometric measurements of absorbed dose in graphite, the other on activity and exposure measurements. The values obtained by…
By in situ high-pressure i.r. spectroscopy acetyl [MeCO] as a possible intermediate for C2-oxygenates and acetate surface species are observed over Rh/SiO2 and Rh–Mn/SiO2 catalysts in a CO–H2 reaction (CO/H2= 0.5, 30–50 kg/cm2, 230–270 °C).
Loss peaks are observed in both the real and imaginary parts of the a.c. conductivity of a-Si and a-Ge samples at around liquid nitrogen temperatures. The data is plotted in a way suggested by a recent scaling theory which yields almost universal curves for the loss peaks. The decay length α+1 is the only adjustable p…
An inversion barrier between enantiomorphic saddle conformers of nickel(II)ccccc-octaethyl-pyrrocorphinate in solution is observed by 1H n.m.r. spectroscopy.
Skin forms a link through which the forces required to hold and manipulate objects are transmitted from the musculoskeletal system to the objects; while these forces are necessary for most work, excessive forces can be injurious. This paper discusses some of the mechanical properties of skin and discusses how they are…
Crystals of the monoclinic compound Cu(SeO 2 OH) 2 were synthesized under hydrothermal conditions. The crystal structure was refined to R w = 0.023 for 952 unique data up to sin θ / λ = 0.81 Å −1 ( a = 5.7662(4) Å, b = 7.3521(6) Å, c = 6.4474(5) Å, β = 93.28(1)°, Z = 2, space group P 2 1 / n ). The Cu atom is [4 + 2]…
Observations of damage during the creep rupture of poly‐crystalline alumina have revealed an important influence of shear bands on the failure process. The shear bands are regions of appreciable damage, consisting of high densities of facet‐sized cavities. The cavities within the bands become crack nuclei at shear ban…
The adsorption of NO on pure MgO at 77 K gives N2O2(cis) dimers on {100} faces and NO–2(nitrite), N2O2–2(hyponitrite) and N2O2(cis) dimers on edges and steps. The hyponitrite anions (which are the precursors of N2O gas formation) and the dimeric N2O2(cis) species are absent at room temperature, while the NO–2 species…