Materials Literature
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The Slater theory of the ferroelectric phase transition in K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$ type crystals as modified by Takagi and extended by Senko is examined again in the light of recent measurements of parameters made on K${\mathrm{D}}_{2}$P${\mathrm{O}}_{4}$. Making full use of the measurements, and assign…
Previously available data on nonlinear optical phenomena in potassium dihydrogen phosphate (KDP) are interpreted together with new data on the linear electrooptic effect. It is shown that second harmonic generation is dominated by energy levels in the ultraviolet ("electronic" levels) whereas the dc and linear electro…
The conventional spherical harmonics expansion of the electron distribution function has been useful in obtaining solutions of the Boltzmann equation under circumstances in which the distribution function is fairly isotropic. This same expansion is here used under conditions in which the distribution is distorted by t…
Crystals of CdTe containing 1 mole% of Mn, Fe, or ZnTe have been grown from the melt. The segregation coefficients of these impurities and of Co can be understood in terms of differences in the covalent, tetrahedral radii of the various metal atoms. The thermal conductivity, $K$, of these crystals and of pure CdTe has…
Brief Particulars of Recently Introduced Materials likely to have Aircraft, Missile or Space Vehicle Applications. Imperial Aluminium Co. Ltd. , Birmingham, is now operating a sales agency in Great Britain for all the aluminium chemical and paste/powder products of ALCOA { Aluminum Company of America ).
As an attempt to improve the stability problem of U-carbide fuel, the solid solutions of UC-ZrC and UC-NbC were prepared. Their stabilities against water corrosion and atmospheric oxidation and their compatibility with graphite were compared with those of UC and UC2.UO2+C+ZrC (NbC) mixture was heated in vacuum at arou…
The authors found that α-alumina film is produced on aluminium by anodic oxidation in the low temperature melts of bisulphates.1, 2, 3) In this paper, in order to clarify the mechanism of formation, optical studies were made for such films as well as the films formed under certain other conditions which are likely to…
Optical observations facilitate the elucidation of the structure of anodic oxide films on aluminium which are mostly of amorphous nature and thus are difficult to be analyzed by X-ray diffraction.In the previous paper, the authors clarified the process of formation and the crystal structure of α-alumina films anodical…
This paper reports the results of efforts to fabricate PbTe thermoelectric elements with a combination of high figure of merit and good shock resistance. Two partially successful approaches to this problem were the addition of tin to PbTe and the application of hot powder pressing. Experimental evidence is presented t…
When high-carbon steel ingots of collt/Jarative/y large size are heated m a heating furnace, crach are often ob,erved in their interior. The author has studied eX/Jerilllentally and theoretically the con.ditions under wh.ich these ingots develop cracks lInder thermal stress during the heating /Hocess.
Differential thermal analysis has been utilised for determination of surface area of china clay and bentonite samples. It, has been observed that the amount of mechanically adsorbed H2O in kaolinite and bentonite samples varies linearly with the surface area of the samples. The amount of this adsorbed H2O has been det…
The influence of the flow resistance of fabrics on their absorption characteristics has been investigated by measuring the flow resistance and the absorption characteristics. To deal with this subject from the point of view of the design and density of fabrics, we wove 13 different kinds of cotton fabrics as samples.…
Abstract A review of the various theories of potential formation on the glass‐electrode is followed by a discussion of the deviations from the ideal hydrogen (H) electrode function in the acidic and alkaline ranges from the viewpoint of the phase‐boundary‐potential theory. The effect of the composition and solubility…
The design of back-up roll bearings in cluster-type rolling mills has, historically, been dictated by past engineering trial and error experience. Thus, to cause the bearings to act, as nearly as practicable, similarly to conventionally supported bearings, the outer ring section is usually made very heavy precluding l…
SummaryAs part of a continuing effort to improve the durability of decorative plated automobile parts, a deleterious type of chromium cracking and the changes in the microstructure of nickel brought about by addition of a sulphur-containing additive have been studied. Type Y cracking of 0·02–0·05 mil chromium deposits…
Investigation has been made on the fresh-water algae as represented in a small but unique collection from Shigatze and Gyangtze districts, southern Tibet, gathered from May to August, 1961, by Mr. H. J. Hwang, an ichthyological worker during the Tibetan Scientific Expedition organized by Academia Sinica. The collectio…
The algal flora of a small, artificial, ice-cave located in Northern Hungary is described. In this cave 23 species of algae (see in Table 3) were found of which the Cyanophyta and Chlorophyta occurred with approximately equal number. (9 vers. 11) It was found that the primary limiting factor influencing the penetratio…
Abstract There are several pieces of evidence in the published literature for the existence of a hexagonal crystalline form of polypropylene. Evidence obtained by infrared absorption, x‐ray diffraction, differential thermal analysis, and annealing experiments is consistent with the view that the quenched state of poly…
アイソタクチックポリビニルエーテルから誘導されたアイソタクチックポリビニルアルコール (isot-PVA) およびポリトリフルオロ酢酸ビニルから誘導されたシンジオタクチックポリビニルアルコール (synd-PVA) をアセトアルデヒドによりアセタール化した。isot-PVAはsynd-PVAよりも大きい反応性を示した。synd-PVAおよび各種の条件下でラジカル重合により製造したポリ酢酸ビニルから誘導されたPVAは, アセタール化に対して互にほぼ同じ反応性を示した。isot-PVAのホウ酸およびホウ砂との反応性も他のPVA試料のそれらよりも大きい。これらの結果およびポリ酢酸ビニルのケン化反応に関する結果から, ラジカル重合ポリビニ…
Polarization measurements have been made on individual electrodes in operating molten carbonate fuel cells by using a third idling electrode. Hydrogen was supplied to the anode and an air‐carbon dioxide mixture to the cathode. Overvoltages as a function of time from 10 −6 to 100 sec after current interruption have bee…