Materials Literature
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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…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic Acid Esters of Cellulose. Preparation by Acid-Chloride-Pyridine ProcedureC. J. Maim, J. W. Mench, D. L. Kendall, and G. D. HiattCite this: Ind. Eng. Chem. 1951, 43, 3, 684–688Publication Date (Print):March 1, 1951Publication History Published online1 May 2002Publis…
In dealing with numerical values for relative intensities derived from the Debye-Scherrer technique, the alteration of diffracted intensities produced by absorption in the sample cannot be ignored. Claassen has shown how this effect can be allowed for in the case of homogeneous cylindrical samples. This paper deals wi…
Examines the analysis of a fragment of a bronze, Chinese vessel.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElastic Modulus and Swelling of Butyl VulcanizatesR. L. Zapp and Eugene GuthCite this: Ind. Eng. Chem. 1951, 43, 2, 430–438Publication Date (Print):February 1, 1951Publication History Published online1 May 2002Published inissue 1 February 1951https://pubs.acs.org/doi/10.1021…
A model for plastic deformation in soft metals, i.e. metals which are not age-hardened or severely cold-worked, is given. It is based on the assumption that in real crystals there is always a number of regions present which, by an unknown process, act as sources of dislocations. Furthermore, it is assumed that in soft…
The absorption of $\ensuremath{\gamma}$-rays in Al, Cu, Sn, Ta, and Pb was measured using $\ensuremath{\gamma}$-rays from ${\mathrm{I}}^{131}$, ${\mathrm{Cu}}^{64}$, ${\mathrm{Mn}}^{54}$, ${\mathrm{Co}}^{60}$, ${\mathrm{Zn}}^{65}$, and ${\mathrm{Na}}^{24}$. Tests showed that scattering from nearby objects and from the…
1. The amount of pseudo-cholinesterase in the livers of adult male rats decreased from 96 to 70 units/100 g. initial body weight during a 6-day fast, but the activity per g. liver changed very little, and the activity of the serum enzyme remained constant at 7-1 units/ml. serum.
If the disodium phenylphosphate contains appreciable inorganic phosphate the solid material should be extracted with 95% alcohol in a Soxhlet.
Abstract Die Theorie der schnellverlaufenden katalytischen Prozesse wird weiterentwickelt und für den Fall der Ammoniak‐Oxydation 1 ) erläutert. Einfache Beispiele werden herangezogen, zugleich wird eine allgemeine Theorie der Ammoniak‐Oxydation gegeben. Als Grundlagen werden im wesentlichen Ergebnisse eigener systema…
Precautions for obtaining clean and reliable replicas for the study of large areas of metal surfaces are outlined. Modifications to the backed replica technique, and the application of preshadowing in metallographic studies are described.
Cast-iron surfaces rubbing against steel have been found to develop a thin layer of a white constituent when scuffing occurs or is approached. This material has not been fully identified, but the results point to it having a basis of two phases, viz. cementite and a quenched high-carbon ferritic phase developed from a…