Materials Literature
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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…
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K. B. Alberman, R. C. Blakey and J. S. Anderson, J. Chem. Soc., 1951, 1352 DOI: 10.1039/JR9510001352
Results are reported on tests of breaking load and elongation of single fibers at constant specimen length from the length groups of 6 cotton samples. A description is given of the instrument used in these tests. Average weight fineness of the center section of fibers from each length group was determined, and the ten…
The melting process can be conceived as consisting of first an expansion, and then a disordering of the crystalline structure. The entropy contribution from the first effect is calculated by analogy with the process occurring in a volume expansion within an individual phase; the entropy contribution from the melting d…
The mobility of electrons in diamond has been measured by means of the Hall effect. In agreement with the theory of Seitz, the mobility is inversely proportional to the three-halves power of the absolute temperature. The measured room temperature value of the mobility is 900 ${\mathrm{cm}}^{2}$/volt-sec as compared wi…
Resume Le Congres de Paris rassembla au mois de septembre de cette annee, 600 congressistes appartenant a 17 nations, qui apporterent plus de 120 communications originales et de tres nombreuses photographies; les Professeurs Wyckoff 2 , Finch 3 , Mark 4 , Cosslett 5 , firent quatre conferences d'ensemble particulierem…
Abstract Vitamin A wurde mit Aluminium‐t‐butylat und Aceton zum 4,8‐Dimethyl–10‐„1′,1′,5′‐trimethyl‐c.‐hexen‐(5′)‐yl‐(6′)”︁‐ decapentaen‐ (1, 3,5,7,9)‐methylketon kondensiert und letzteres in kristallisierter Form dargestellt (C 23 ‐Keton).