Materials Literature
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A 46‐in core from the lacsutrine sediments beneath Mexico City was analyzed to establish a stratigraphic sequence of diatom assemblages for use in interpreting the climatic and limnologic history of ancient Lake Texcoco. Diatoms were found in nearly every 20‐cm sample interval, and several major zones were established…
Abstract An idealized model for flexible foam in tension is developed. The model includes large deformations and cell structure orientation before and after deformation. It is predicted that two quantities affect the initial modulus of an unoriented foam: the density and a cell structure parameter. Data for latex foam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of ruthenium nitrosyl complexes containing 2,2'-bipyridine and 1,10-phenanthrolineThomas J. Meyer and John B. GodwinCite this: Inorg. Chem. 1971, 10, 3, 471–474Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1…
The nonlinear quasi-Poisson equation that describes static magnetic fields in saturable iron is solved approximately by minimizing the corresponding nonlinear energy functional. The minimization is performed by means of the method of finite elements, using firstorder elements and a quadratically convergent iterative s…
When a Cu surface is sputtered by ion bombardment under the condition that Mo atoms arrive at the Cu surface during sputtering an unexpected phenomenon can arise: The surface of the Cu target becomes covered with microscopic cones. The cone density increases with increasing flux density of arriving Mo atoms. When the…
Lattice dynamics has some claim to being the oldest branch of solid state physics. Planck's Theory of Radiation and the Theory of Specific Heat was published by Einstein in 1907, On Vibrations in Space Lattices by Born and von Karman in 1912, and On the Theory of Specific Heat by Debye in the same year. Other early pa…
Abstract The glycerides 2‐oleodipalmitin (POP) and 2‐elaidodipalmitin (PEP) were synthesized and their melting behavior and dilatometric properties were determined. Three mixtures of POP with PEP were examined. Five polymorphs of POP and four of PEP were identified by x‐ray diffraction patterns. Rates of transformatio…
Untreated and chemically modified cotton fabrics which had been laboratory-abraded by machine-washing and tumlle drying were studied with the scanning electron microscope. Generally, abrasion patterns were not different from those normally associated with any wet or dry abrasion. Greater differences were observed betw…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination effects on the spectrum of uranium(IV) in molten fluoridesLouis M. TothCite this: J. Phys. Chem. 1971, 75, 5, 631–636Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1 March 1971https://pubs.acs.org/doi/10.102…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicromeritics Instrument CorporationCite this: Anal. Chem. 1971, 43, 3, 44APublication Date (Print):March 1, 1971Publication History Published online23 May 2012Published inissue 1 March 1971https://doi.org/10.1021/ac60298a734RIGHTS & PERMISSIONSArticle Views10Altmetric-Citat…
Abstract It is shown that various modulus values of carbon black reinforced rubber are functions of the product of the actual black loading and a structure dependent factor. The structure factor appears to be a linear function of the so-called 24M4 value of the dibutylphthalate absorption and is independent of elongat…
Abstract The optical and transport properties in the paramagnetic phase of α‐RuCl 3 are studied here for the first time. Values are reported for the dc conductivity of single crystals over the temperature range 110 to 500 °K in the two crystallographic directions, along and perpendicular to the optic c ‐axis: at 300 °…
The sintering and grain‐growth kinetics of finely divided MgAl 2 O 4 were determined from 1300° to 1600°C for densities up to 96% of theoretical. These results show that sintering is governed by volume diffusion and that the temperature dependence of the diffusivities is 157 exp [(‐118 kcal/mol)/ RT ] cm 2 /s. Grain g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spin resonance study of the photoionization of thymine. Thymine cation and anion radicalsMichael D. SevillaCite this: J. Phys. Chem. 1971, 75, 5, 626–631Publication Date (Print):March 1, 1971Publication History Published online1 May 2002Published inissue 1 March 197…
The results of studies concerning the effects of artificially increasing temperature and naturally and artificially increasing day length are discussed. Naturally increasing day length was more favorable for community development than increasing clay length by artificial light. Increasing temperature is most beneficia…
Abstract Explanations of the deviations of polymer crystallisation isotherms from Avrami equations are considered in the light of the assumptions inherent in the derivation of the equations and analysis of the crystallisation isotherms; these explanations are rejected. Modified equations which allow for the presence o…
Distinct glass‐forming composition regions were found in the system Ge‐S (1) from GeS 2 to GeS 9 and (2) from GeS 1.21 a to GeS 1.5 The properties of these glasses, e.g. ir absorption spectra, thermal expansion, extraction of S 8 molecules with CS 2 , Vickers hardness, density, and optical absorption, led to the concl…
The treatment of the deterioration of insulation as a chemical rate phenomenon has been extended to cover complex multiple reactions. The relationships between the parameters goveming the thermal stability of a polymer in a given environment are calculated first for isothermal thermal endurance test conditions and sec…
The difficulties involved in the accurate measurement of the flow stress of materials at high rates of deformation are reviewed, and methods of overcoming these difficulties are discussed. It is concluded that the best experimental method is that in which a split Hopkinson bar is adapted for torsion testing, and the l…
Abstract Small‐angle multiple scattering of low‐energy heavy particles (Born parameter α > 1) in solid layers is calculated, using a scattering cross section derived from classical mechanics. The angular distribution of the scattered particles is given as a sum of two functions, which are tabulated. The calculated…