Materials Literature
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Abstract Die im Röntgenkleinwinkeldiagramm von verstrecktem Polyäthylen auftretenden Meridian‐ Interferenzen werden durch eine nahezu periodische Anordnung von kristallinen und fehlgeordneten Bereichen hervorgerufen. Die durch den mittleren Abstand zweier aufeinanderfolgender Kristallite definierte Langperiode hängt v…
Abstract Die Ausarbeitung einer technischen Synthese von 11‐Aminoundecansäure hat zur Aufnahme des Polyamids 11 – unter der Bezeichnung Rilsan – in die Reihe der handelsüblichen Polyamide geführt. Die Eigenschaften des Rilsans leiten sich aus der Struktur seines Grundbausteines ab: Im Rilsan sind die Carbonamidgruppen…
The role of crystalline structure in the surface reactivity of predominantly covalent materials has been examined in terms of chemical bonding concepts. In this context a solid surface can be viewed as a giant lattice defect characterized by dangling bonds. Although it is difficult, at the present stage of development…
This paper deals with the space and time dependent reactor stability problem of neutron flux shape variations due to xenon-135. The effect of modal interaction on stability is investigated for a simple reactor model when the characteristic functions of the wave equation are used in a modal expansion. It is shown that…
1. The enzymes aconitase, TPN-specific isocitric dehydrogenase, alpha-ketoglutaric dehydrogenase, succinic dehydrogenase, fumarase, malic dehydrogenase, DPNH oxidase, and DPNH-cytochrome c reductase have been assayed in two fractions, large granules and supernatant, prepared from sucrose homogenates of fertilized eggs…
Numerous articles have appeared in the literature on such factors involved in garment comfort as moisture porosity and wickability. However, the only way to determine the relative importance of such factors is to conduct a subjective comfort test. This has been done for knitted sport shirts of "Orlon," 1 nylon, and ra…
Abstract Es wurde das System KCl–H 2 O in Gegenwart von K 4 [Fe(CN) 6 ] · 3 H 2 O sowie K 3 [Fe(CN) 6 ] in bezug auf die Lage der Grenze der kritischen Übersättigung, auf seine Löslichkeit und auf die Verschiebungsgeschwindigkeit von KCl‐Kristallflächen untersucht. K 4 [Fe(CN) 6 ] · 3 H 2 O und K 3 [Fe(CN) 6 ] verursa…
Magnetic susceptibilities of Gd2O3 and Dy2O3 have been studied from about 300° to 1500°K and 300° to 1250°K, respectively. The paramagnetic susceptibility data of both oxides obey the Curie-Weiss law. This information supports the suggestion that the small deviations from the Curie-Weiss law found in gadolinium and dy…
Monodisperse precipitates of silver bromide were made which had average grain sizes in the range of 0.1 to 1.0 μ. The optical transmittance of dilute turbid suspensions of the grains was measured over the wavelength range from 300 to 700 mμ. Suspensions in water and in gelatin coatings were measured and the results co…
Reflection spectra of Co, Ni, Cu, Zn, and metal-free phthalocyanines have been measured. The Davydov splitting of the main absorption peak in the metal compounds correlates with the relative tendencies of the metals to out-of-plane bonding. Photoconduction response curves have been measured between 1500 and 300 mμ for…
Self-diffusion coefficients in platinum have been measured, in the temperature range between 1250°C and 1725°C, by measuring the decrease of activity at the surface of the specimen during diffusion. The experimental results can be summarized by the following relationship: D = 0.22 exp (−2.89 ev/kT) cm2 sec−1. The cons…
Raman intensities and frequencies of molten potassium bisulfate, obtained in the temperature range of about 300° to 700°C, provide evidence for the reactions 2HSO4−→S2O72−+H2O and S2O72−→SO42−+SO3. Between 300° and 620°C the HSO4− concentration, inferred from Raman intensities, decreases rapidly. Simultaneously, the S…
The lathyrogenic effect of INAH in the chick embryo may be measured by the increase in the extractibility of collagen from the bones with 1 M NaCl. Incubation of these bones in vitro with carbonyl compounds diminishes the amount of extractible collagen; with D-L-glyceraldehyde the reversal of the INAH effect is comple…
A1-3.85% Cu single crystals were studied by means of the back-reflection divergent X-ray beam method after solution treatment, various modes of quenching and various stages of age-hardening. A complete strain analysis was developed by which the principal strains in a crystal or polycrystalline material can be determin…
The aggregation of pairs consisting of divalent cations and cation vacancies, in KCl containing Sr 2+ , KCl containing Ba 2+ and NaCl containing Mn 2+ , has been studied by dielectric absorption measurements. Each of the pairs forms a dipole and the decay with time of the dipole concentration at various temperatures,…
The infrared absorption spectrum of peroxy titanium sulphate has been studied in the region from 2 to 23 μ and the various bands are characterized. The sulphate group in the compound is shown to have C 2v symmetry, indicating its bidentate nature.
The role of cerium in the suppression of gamma‐ray induced coloration in glass has been found to depend on the relative concentration of Ce 3+ to Ce 4+ ions as well as on the total cerium content. In a borate glass having high ultraviolet transmission, it has been found that both Ce 3+ and Ce 4+ ions are necessary to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexafluorides of Molybdenum, Tungsten, and Uranium. I. Reactions with Nitrous and Nitric OxidesJ. R. Geichman, E. A. Smith, S. S. Trond, and P. R. OgleCite this: Inorg. Chem. 1962, 1, 3, 661–665Publication Date (Print):August 1, 1962Publication History Published online1 May…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Reactions of Diethylenetriamineaquoplatinum(II) Ion with Different LigandsHarry B. Gray and Richard J. OlcottCite this: Inorg. Chem. 1962, 1, 3, 481–485Publication Date (Print):August 1, 1962Publication History Published online1 May 2002Published inissue 1 Au…
The respiratory coefficient, expressed here as respiration per unit of chlorophyll, of six clones (five species) of diatoms was measured at temperatures of 5°, 10°, 15°, 20°, and 25 °C. The acclimatized cultures used were grown at each of these temperatures that supported sufficient growth. Considering any one of the…