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The observation of a dislocation ‘Climb’ source
It has been found, using thin film electron microscopy, that aluminium 3.5 and 7.3 atomic per cent magnesium alloys quenched into silicone oil contain concentric diamond-shaped dislocation loops lying upon the cube planes. An examination of the various dislocation interactions which occur together with the electron di…
On a General Relation Involving the Glass Temperature and Coefficients of Expansion of Polymers
Treating the glass temperature TG of polymers as an iso-free volume state allows one to derive the result (αL—αG). TG=K1, a constant; or the approximate result αLTG=K2, another constant. The α's are the coefficients of cubical expansion for 100% amorphous polymer above and below TG. K1 is 0.113 for a wide variety of p…
A Re-Examination of the Relative Turgidity Technique for Estimating Water Deficits in Leaves
The relative turgidity technique consists in comparing the initial and turgid water contents, on a percentage basis, of disks punched from leaves, the turgid water content being obtained by floating the disks on water.
Fasern und Filme aus isotaktischem Polypropylen. Herstellung und Eigenschaften unter Berücksichtigung ihrer kristallinen Textur
Abstract Die kristalline Textur des isotaktischen Polypropylens ist für seine Anwendung im Bereich der synthetischen Filme und Fasern von Bedeutung. Die Erzielung einer smektischen Struktur hat sich für die Herstellung von nicht orientierten Filmen mit guten optischen Eigenschaften und von Fasern mit hoher Bruchfestig…
Anomalous electron absorption effects in metal foils: theory and comparison with experiment
Abstract The two-beam dynamical theory of electron diffraction in absorbing crystals has been applied to explain features of bend and thickness extinction contours and of images of stacking faults observed on transmission electron micrographs of metal foils. Inelastic scattering processes affect the intensities of the…
Polarization of the Electret
The internal charge distribution of the carnauba wax electret has been determined by a sectioning method: After polarization and cooling samples are cut into sections of different thickness. These are reheated and the ensuing discharge currents are measured. The total released charge, as determined by numerical integr…
Color Centers in a Cerium-Containing Silicate Glass
X-ray irradiation of glass with the weight percent composition 75% SiO2, 25% Na2O produces color centers which absorb visible light. Cerium in the glass prevents the formation of these centers. The nature of the centers and the mechanism by which cerium prevents their formation are studied by measuring the optical abs…
Über Langperioden bei verstrecktem Polyäthylen
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…
Rilsan (Polyamid 11), Synthese und Eigenschaften
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…
Crystalline Structure and Surface Reactivity
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…
The Effect of Modal Interaction in the Xenon Instability Problem
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…
THE CONCENTRATIONS OF SOME ENZYMES OF THE CITRIC ACID CYCLE AND ELECTRON TRANSPORT SYSTEM IN THE LARGE GRANULE FRACTION OF EGGS AND TROCHOPHORES OF THE OYSTER, CRASSOSTREA VIRGINICA
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…
Fiber Properties Responsible for Garment Comfort
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…
Lösungs‐ und Wachstumsbehinderung im System KCl–H2O durch Blockierung mit einer Deckschicht komplexer Cyanide
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 Susceptibility of Gadolinium and Dysprosium Sesquioxides at Elevated Temperatures
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…
Turbidity of Monodisperse Suspensions of AgBr*
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…
Spectra and Photoconduction of Phthalocyanine Complexes (I)
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 in platinum
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…