Materials Literature
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Abstract A method for determining long‐chain branching frequency and molecular weight averages for unfractionated low‐density polyethylene (LDPE) by the combined use of gel‐permeation chromatography (GPC) and intrinsic viscosity data has been reported (GPC–IV method). The method assumes that the number of long branche…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLaser emission spectrography of rare earth elementsToshio. IshizukaCite this: Anal. Chem. 1973, 45, 3, 538–541Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 March 1973https://pubs.acs.org/doi/10.1021/ac60325a024https:/…
Calcium carbonate structure in mollusc shells can be determined by infrared spectroscopy. Infrared analysis is easier and less expensive than most other current methods for macroscopic analysis of the structures in gross calcium carbonate. Shell specimens from 22 river species were shown to be entirely aragonite; the…
The effects of wash-water temperature, cold-water or regular detergent, wash-cycle design, drying, and drying temperature on survival of four microorganisms on polyester-cotton sheeting were examined. Escherichia coli T3 bacteriophage survived washing at 24, 35, 46, and 57 C, but not at 68 C. Serratia marcescens survi…
In‐reactor creep tests were performed on stoichiometric UO 2 helices enriched with 1.82% 235 U at fission rates of 2×10 12 to 1.5×10 13 fissions/cm 3 ‐s and outer‐fiber shear stresses of 2890 and 2090 psi. Depending on the test procedure, the initial creep transient either decelerated continuously or was of the sigmoi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of polyenes. III. Preparation of 7-cis-ionyl and ionylidene derivatives and other sterically hindered olefins by one-way sensitized geometric isomerizationV. Ramamurthy, Y. Butt, C. Yang, P. Yang, and R. S. H. LiuCite this: J. Org. Chem. 1973, 38, 6, 1247–1249…
Cu and Cu—Al alloys were pre-stressed to produce strains of the order of 10−4 and then reverse strained to study the Bauschinger effect. Under these conditions of pre-stressing cross slip will not occur to any significant degree and variations in the mechanical properties of the alloys reflect differences in the type…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and single-crystal electron paramagnetic resonance data for bis[dihydrobis(1-pyrazolyl)borato]cobalt(II)L. J. Guggenberger, C. T. Prewitt, P. Meakin, S. Trofimenko, and J. P. JessonCite this: Inorg. Chem. 1973, 12, 3, 508–515Publication Date (Print):March 1…
Abstract A differential conductimetric apparatus allowing the continuous titration of HCl carried by a stream of gas with a limit sensitivity of 40 nanograms is described and applied to study the initial steps of poly(vinyl chloride) thermal degradation. The powdered sample is placed in a quartz cell which may be clos…
For pt. I. see ibid., 523-36. The Peierls stress of the 1 / 2 (111) nonscrew dislocations was calculated. Two methods were used: positioning the dislocation in various crystallographically nonequivalent positions and calculating the corresponding variation in its core energy, and simulation of the dislocations in a cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal structure of Nb14S5H. Y. Chen, R. T. Tuenge, and H. F. FranzenCite this: Inorg. Chem. 1973, 12, 3, 552–555Publication Date (Print):March 1, 1973Publication History Published online1 May 2002Published inissue 1 March 1973https://doi.org/10.1021/ic50121…
Atomistic calculations of the core structures of six different nonscrew 1 / 2 (111) dislocations lying on a (110) plane have been made using three different central inter-atomic forces. The cores of all the dislocations studied have been found to be similar: planar, confined to a single (110) plane. The results are, t…
Abstract Secretion of the exoskeleton of Thecidellina barretti proceeds in the same way as in other living brachiopods, but the structure of the mantle edge is different. Mucin cells occupy the core of the outer mantle lobe, and periostracal secretion begins within a slot separating lobate cells charged with secretion…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance and electron spin resonance investigation of axial solvation in planar, low-spin cobalt(II) porphyrin complexesGerd N. La Mar and F. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 6, 1790–1796Publication Date (Print):March 1, 1973Publicat…
The results of single-zone annealing of 76 samples of Pb1−xSnxTe are reported, covering the entire composition range from pure PbTe to pure SnTe. Some of the sample preparation work overlapped and improved on the work of others, while some of the results, particularly in the alloy samples, are new. Annealing times, te…
This paper reports the results of extensive examination of 15 kV and 22 kV polyethylene insulated cables which had been in service from less than one year to eleven years. The data presented are the results of the continuation of the investigation reported previously. This investigation of samples rermoved from servic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProton nuclear magnetic resonance and electron spin resonance investigation of the electronic structure and magnetic properties of synthetic low-spin ferric porphyrinsGerd N. La Mar and F. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 6, 1782–1790Publication Date (Print)…
Experimental figures for the solid-liquid free energy, γSL, have been obtained for white phosphorus, for seven organic substances and for ice-water-sodium chloride systems having salt concentrations in the melt of 0 to 1 mol kg−1. The present work utilized observations made of grain-boundary grooves at solid-liquid in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamics of ligand and oxygen binding to cobalt protoporphyrin IX dimethyl ester in toluene solutionDennis V. Stynes, H. Cleary. Stynes, Brian R. James, and James A. IbersCite this: J. Am. Chem. Soc. 1973, 95, 6, 1796–1801Publication Date (Print):March 1, 1973Publicati…
Hydrogen-induced slow crack growth, da/dt, was studied in AISI-SAE 4130 low alloy steel in gaseous hydrogen and distilled water environments as a function of applied stress intensity, K, at various temperatures, hydrogen pressures, and alloy strength levels. At low values of K, da/dt was found to exhibit a strong expo…