Materials Literature
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The pH response, hygroscopicity, and che mi cal durability of a seri es of Na, O-K, O-Si02 glasses have bee n in vestiga ted. The pH responses of electrodes prepared from t hese glasses are in accord wit h similar dat a previously reported for t wo other series of glasses, namely, N a, O-CaO-Si02 and N a20 -PbO-Si02,…
Abstract Methods which have proved useful in the chemical and infra‐red examination of plasticizers used in polyvinyl chloride (PVC) compositions are summarized. Information is given about the method of isolation of the plasticizer and the qualitative tests which may be applied. On the quantitative side attention is g…
(1951). THE ANALYSIS OF YARN IRREGULARITY. Journal of the Textile Institute Proceedings: Vol. 42, No. 3, pp. P107-P113.
Compositions having negative linear thermal expansions ranging from 0 to –0.38% have been obtained in two areas of the system lithia‐alumina‐silica. Petrographic and X‐ray examinations indicate the presence of three principal crystalline phases, each of which is a solid solution: β ‐eucryptite, β ‐spodumene, and an un…
Part I. A short discussion is given of the magnetic properties of large aromatic hydrocarbons and of the applicability of various wave-mechanical methods of calculating the diamagnetic susceptibility. The ultimate particles of most cokes and carbon blacks are not sufficiently large to be regarded as crystalline and mu…
The kinetic and potential parts of the nuclear surface energy are calculated on the basis of the statistical model of the nucleus taken to first order and using a gaussian interaction between particles. The resulting surface energy is found to be of the right order of magnitude, the calculated figure being in fact 55%…
Co mpressio n da ta (t. V IVo) are repor ted between 1,000 a nd 10,000 atmos pheres for the foll owing materi a ls : dry cellulose, polyvinylidene chloride (Saran), polyeth ylene, polyrn onochlorotrifluoroeth ylene (K el-F) , polytetrafluoro ethy le ne (T efion ), a polyester (Seleetron 5003), and raw r ubbers, H ycar…
Measurements have been made on single crystals of CuZn and Cu3Au held at various temperatures below Tc to decide whether there is a single-ordered phase whose order changes with temperature, or whether there is an ordered and a disordered phase the relative amounts changing with temperature. Precision measurements wer…
A study has been made of butadiene-styrene copolymers formed at −18°C. From analyses for bound styrene in the product for various conversions and initial butadiene-styrene ratios the reactivity ratios were calculated to be r 1 = 1.37 and r 2 = 0.38 compared with 1.8 and 0.6 at 45°C. Q and e for butadiene were 1.38 and…
The present reticular concept of the internal structure of cellulose gels is inadequate from several points of view. Principally, it fails to take sufficient account of purely energetic effects in the mechanical behavior of the gels, and is based primarily upon entropy changes. Further more, the marked influence of de…
Abstract Adsorption of nitrogen and hydrogen on lithium was investigated and the activation energy for nitrogen found to be 47 kg.‐cal./g.‐mol. The addition of other metals promoted adsorption, cerium being found the most effective. The rates of formation of calcium hydride and calcium nitride from the gases and the m…
The general theory is developed and the exact solutions obtained for the design of reflecting microscope objectives having two or three concentric spherical surfaces. It is shown that the only serious optical defect of reflecting objectives, low contrast due to the high obstruction ratio, can be satisfactorily control…
YASUYUKI OGURA; STUDIES ON THE GLUCOSE DEHYDROGENASE OF ASPERGILLUS ORYZAE, The Journal of Biochemistry, Volume 38, Issue 1, 1 March 1951, Pages 75–84, https://
Abstract The dichroism of crystals of BaPt(CN)4·4H2O, CaPt(CN)4·5H2O and MgPt(CN)4·7H2O has been measured in the visible and the near-ultraviolet region, and with the aid of results of this measurement, the state of the complex ions in the crystals has been, discussed in relation to their crystal structures. These cry…
The emissivity, reflectivity, and transmissivity have been studied for a number of glasses throughout the wave‐length region 2.2 to μ , and through a temperature range of 500° to 1500°F. In general it is found that, although the spectral emissivity varies considerably with wave length throughout the opaque portion of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic Acid Esters of Cellulose. PropertiesC. J. Maim, J. W. Mench, D. L. Kendall, and G. D. HiattCite this: Ind. Eng. Chem. 1951, 43, 3, 688–691Publication Date (Print):March 1, 1951Publication History Published online1 May 2002Published inissue 1 March 1951https://pubs.…
ADVERTISEMENT RETURN TO ISSUEArticleNEXTExperiments on the Reduction of the Crystallinity of Cotton Cellulose.Leon Segal, Mary L. Nelson, and Carl M. ConradCite this: J. Phys. Chem. 1951, 55, 3, 325–336Publication Date (Print):March 1, 1951Publication History Published online1 May 2002Published inissue 1 March 1951htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow Temperature Heat Capacities of Inorganic Solids.1 V. The Heat Capacity of Pure Elementary Boron in Both Amorphous and Crystalline Conditions between 13 and 305°K. Some Free Energies of FormationHerrick L. Johnston, Herbert N. Hersh, and Eugene C. KerrCite this: J. Am. Ch…
Each type of ion is shown to have very nearly the same polarizability in different crystals of the perovskite type as well as in the diagonal cubic types reported previously. This conclusion is based on dielectric constant data for several titanates and zirconates and KMg${\mathrm{F}}_{3}$. The values of ionic polariz…
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