Materials Literature
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Microcrystalline cellulose (M.C.C.) having various ratios of crystal region to amorphous one obtained by grinding. Crystallinity was determined for M.C.C. and ground M.C.C. by X ray diffraction method (powder method) using Hermans'theory. Crystallinity was also determined by infrared measurement in converting hydroxyl…
The production of radioactive nuclei during the operation of a light-water reactor is traced, and their decay history is followed. The potential environmental impacts of this waste are calculated and shown to be comparable to those of other materials we produce. Assuming deep burial, it is shown that there are importa…
The syntheses of four binary porphyrins, two of which are constrained to a "face-to-face" conformation, and their Co2+ and Cu2+ derivatives are described. Electron spin resonance indicates that the intermetallic separation in the binuclear "face-to-face" porphyrins is about 6.5-6.8 A. Electronic spectra and proton mag…
(1977). Radiolysis of Glutathione in Oxygen-containing Solutions of pH 7. International Journal of Radiation Biology and Related Studies in Physics, Chemistry and Medicine: Vol. 32, No. 2, pp. 195-202.
Recent theoretical calculations of the properties of rare gases, and in particular Helium, in the common f.c.c. and b.c.c. metals, are reviewed from the viewpoint of the investigator concerned with the behaviour of rare gas in such radiation damage processes as surface blistering and void swelling. Particular attentio…
Résumé. 2014 Un modèle utilisant l’élasticité de type mixte introduite par de Gennes est construit pour décrire le comportement de cristaux liquides smectiques A soumis à des forces de compression ou de dilatation normales aux couches. Ce modèle prévoit deux types d’instabilités mécaniques, respectivement: basculement…
A new nondestructive technique is described which provides information about the distribution of charges in nonpolar electrets. Changes in the equivalent electret voltage are measured during and after the absorption of a short pulse of heat on one side of an otherwise well thermally isolated electret. The total electr…
Abstract The morphology of porous polysulfone hollow fibers which were spun by the dry–wet spinning process is discussed. It was demonstrated that a relatively moderate quenching medium should be employed in the bore of the nascent fiber in order to produce an isotropic fiber free of macrovoids and intrusion cells. A…
The splay and twist elastic constants (k 11 and k 22) of pentyl, hexyl, heptyl and octyl cyanobiphenyls (5CB, 6CB, 7CB and 8CB respectively) have been determined by the Freedericksz transition method. The results are compared with the bend elastic constants (k 33) and order parameters (S) of these compounds reported b…
The first measurements of integrated lateral stress S have been obtained for He implantations to fluences where surface deformation occurs. Implants into Mo, Nb, and Al were carried out at room temperature. The low-fluence results provide values for the induced volume expansion per implanted He atom. The high-fluence…
Included are fifty-nine papers. Each paper has been separately processed for the Energy Data Base. (DG)
The effect of the presence of gaseous hydrogen on the mechanical properties of steels is presented. This phenomena, generally known as hydrogen embrittlement, is shown to be dependent on the ability of the steel to adsorb hydrogen. A series of crack‐growth and adsorption experiments clearly shows that the supply of hy…
The ordering of H in α, β, γ and δ-niobium hydride phases can be classified on the basis of electrostatic forces. In α and α'-NbH the H atoms should not be distributed statistically on all tetrahedral sites of the b.c.c. Nb lattice, but should prefer short-range ordering. In agreement with the structure determination,…
An efficient non-template synthesis of a new macrocycle, a conjugated tautomer of 1,14 : 7,8-diethenotetrapyrido-[2,1,6-cd:2′,1′,6′-gh :2″,1″,6″-jk:2‴,1‴,6‴-na][1,4,8,11]tetra-azacyclotetradecine (3), is described. The thermal behaviour of several disubstituted 1,10-phenanthrolines towards dimerization is studied by u…
Starting from a p-aminobenzoate-requiring strain of Escherichia coli (E. coli K-12 AB3292), we have isolated mutants that can grow in the absence of p-aminobenzoate (and thus tetrahydrofolate). The following lines of evidence suggest that at least one of these mutants is capable of initiating protein synthesis without…
This literature review was conducted in connection with a study on heat transfer in frozen logs. A combination of data by two researchers on specific heat and thermal conductivity and diffusivity in the radial direction of wood, at various temperatures and moisture contents, is discussed and compared with data from ot…
Precise conductivity results are reported for dilute aqueous solutions of lithium, rubidium and caesium fluorides and for lithium bromide and iodide and sodium iodide at 25°C. The results are analysed in terms of both the full Pitts equation and the latest version of the Fuoss conductivity equation. Association consta…
The largest gap in the list of reciprocal interatomic distances is used to limit the coordination polyhedra. For the structure types AIB2 and NiAs, the polyhedra are evaluated according to c/a. In plots of c/a versus rA/rB, the various coordination types correspond to actually observed families of representatives. The…
CdTe is a material potentially useful for a number of optical applications. These include electrooptic modulation, high power laser windows, electroluminescence and photo-conduction. In this review these and other uses will be described. Particular attention will be paid to the various optical absorption mechanisms an…
Specific heat data (at zero field and 21.7 kV/cm) and electrocaloric data (field strengths up to 23.5 kV/cm) were measured on the same sample of a carefully prepared SrTiO3 ceramic between 2-30 K. A field-dependent maximum in CT-3 at 23 K is due primarily to a large density of acoustic phonons at 70 cm-1 and to the fi…