Materials Literature
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Data from 145 recent impact tests of reinforced concrete walls with solid and pipe missiles are used to assess the accuracy of several empirical formulas. For solid missiles, penetration depths greater than six-tenths the missile diameter are predicted by the NDRC formula to within —25%, scabbing is predicted equally…
Abstract Soil from the surface horizon of a highly weathered soil (Acrohumox) from tropical Queensland was mixed with crushed basaltic cinders and incubated in a moist condition for 12 months in the laboratory. The cation exchange capacity (CEC) increased from 9 to 14 meq/100 g in direct relationship to the rate of ap…
SUMMARY Despite the important contribution of high‐resolution electron microscopy to materials science, the use of computer simulation as a reliable tool for the interpretation of the structure images in complex crystals or disordered solids has been limited seriously by the high computer demands of the available comp…
The effect of gamma ray irradiation on the density, refractive index, thermal expansion, and helium permeability of a variety of commercial borosilicate glasses has been measured for doses between 108 and 1011 rad. The radiation-induced densification of these glasses for a constant dose can vary by as much as factor o…
This article reviews the preparation and properties of silicon–germanium alloys, mentions some recent developments in their technology, and assesses their potential for further improvement as high temperature thermoelectric materials.
Abstract Greenhouse and laboratory experiments conducted with a clayey kaolinitic isohyperthermic Typic Haplustox from the Cerrado region of Brazil showed that CaCO 3 , CaSiO 3 , and previous P applications decreased P fixation and improved cation retention properties. The amendments were added at rates to replace 1 o…
Abstract Four Indian varieties of silk viz., Mulberry, Tasar, Eri, and Muga, have been investigated by x‐ray diffraction and infrared spectroscopy. The hydrolysis for Mulberry was carried out using 6 N HCI at 40°C, whereas the other wild varieties of silk were hydrolyzed partially using 8 N HCI at 40°C. The x‐ray orde…
The chemisorption of oxygen on clean polycrystalline indium surfaces is investigated by the combined techniques of x-ray photoelectron spectroscopy (XPS) and the static mode of secondary ion mass spectroscopy (SIMS). Oxygen uptake is characterized by a moderately rapid formation of In2O3, with no preoxidation adsorbed…
We have simulated the properties of an ensemble of biaxial particles interacting via an anisotropic pair potential, truncated at the second rank terms, using the Monte Carlo technique. The particles are confined to the sites of a face centred cubic lattice and the interactions are restricted to nearest neighbours. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of amphiphiles in nonaqueous mediaE. Ruckenstein and R. NagarajanCite this: J. Phys. Chem. 1980, 84, 11, 1349–1358Publication Date (Print):May 1, 1980Publication History Published online1 May 2002Published inissue 1 May 1980https://pubs.acs.org/doi/10.1021/j10044…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance spectrometry for determination of substituents and their distribution in carboxymethylcelluloseFloyd F. L. Ho and Daniel W. KlosiewiczCite this: Anal. Chem. 1980, 52, 6, 913–916Publication Date (Print):May 1, 1980Publication History Publishe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of Elastic and Piezoelectric Constants of Polymer Crystals by a Point Charge Model: Application to Poly(vinylidene fluoride) Form IKohji Tashiro, Masamichi Kobayashi, Hiroyuki Tadokoro, and Eiichi FukadaCite this: Macromolecules 1980, 13, 3, 691–698Publication Da…
The thermal and guanidine hydrochloride (GdnHCl) denaturation of lysozyme has been investigated at various concentrations of tri-N-acetylglucosamine ((GlcNAc)3), a trisaccharide which binds specifically at the active site of native lysozyme. The presence of (GlcNAc)3 leads to a readily observable stabilization of the…
The silicon content of five species of marine planktonic diatoms grown in laboratory culture was measured by a method involving soda hydrolysis of cells collected on polycarbonate filters. An increase in the temperature or light intensity during growth resulted in an increase in the Si content in some species and a de…
The contribution of the associated steps to the properties of grain-boundary dislocations are investigated. Two methods of step-height determination are given and it is shown that the step height, like the Burgers vector, must be conserved during the reactions of grain-boundary dislocations: this is not always automat…
The free-volume model, recently extended by the present authors to account for the equilibrium thermodynamic behavior of dense liquids and glasses, is used as a basis for a relaxation theory of the kinetic effects observed in the heat capacity ${C}_{p}$ near the glass transition temperature ${T}_{g}$. Most importantly…
Abstract Cellulose mesophases were obtained by preparing concentrated solutions of cellulose (20–55%) in a mixture of N ‐methyl‐morpholine N ‐oxide (MMNO) and water. The anisotropy depends on four interconnected parameters: the temperature of the solution which, in general, must be lower than 90°C; the concentration o…
The superspace-group approach [Janner & Janssen (1977), Phys. Rev. B, 15, 643-658] is used to solve the symmetry problem of incommensurate crystal phases in the case of displacive- and occupation-wave modulation. Generalization is given to cover magnetic modulation as well. The symmetry conditions imposed by the super…
X-ray diffraction studies to 2.8-A resolution have yielded the three-dimensional structure of mitochondrial aspartate aminotransferase (L-aspartate:2-oxoglutarate aminotransferase, EC 2.6.1.1), an isologous alpha 2 dimer (Mr = 2 x 45,000). The subunits are rich in secondary structure and contain two domains, one of wh…
We present electron spin resonance studies of the magnetic defect in undoped polyacetylene. Temperature dependences of the absorption spectra of (CD)x and (CH)x over the range 2–295 K have been obtained. The properties of the magnetic defect in fully isomerized trans samples and in cis-rich samples are compared. The d…