Materials Literature
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A formula for discharge current flowing in a space charge filled gap is derived for a general geometry of electrodes from the energy balance equation in which the displacement current caused by the motion of the charged particles in the gap is taken into account. It is found that in the formula obtained the influence…
The eddy current drag on a moving domain wall is proportional, not to the instantaneous wall velocity, but to a moving average of its recent velocities. Thus an oscillating domain wall experiences an eddy force component in quadrature with its velocity that may formally be attributed to a negative effective 'eddy mass…
The electronic structure of the transition metal dichalcogenide layer compounds is studied using hybridised orbitals appropriate to the transition metal atom coordination. Non-bonding orbitals on the transition metal atoms give the conduction electron bands which are responsible for the charge-density-wave phase trans…
With the use of crossed beams of electrons and multiply charged argons ions, dominant contributions (above 90%) of $L$-shell ionization to multiple ionization of ${\mathrm{Ar}}^{i+}$ ions ($i=1, 2, 3$) at electron energies below 800 eV are identified. The observed contributions are explained in terms of the electron r…
Propylene glycol alginates give greater increases in foam stability than are given by equal amounts of neutral polysaccharides. This is due to electrostatic interaction between carboxyl groups on the glycol alginate molecules and amino groups on the peptides in the bubble wall. This interaction within the bubble wall…
硫酸アンモニウム融解法の酸化アルミニウム,酸化チタン(IV)及び酸化ニオブ(V)への適用性を検討した.酸化アルミニウム,酸化チタソ(IV)及び酸化ニオブ(V)に対し融剤量は,それぞれ,20倍,20倍,10倍,融解時間は2時間,1時間,1時間,融解温度は400℃,450℃,400℃の条件で融解を行った結果,酸化アルミニウム,酸化チタン(IV),酸化ニオブ(V)の回収率はそれぞれ(99.2±0.4)%,(100.1±0.2)%,(100.1±0.2)%であった.この結果より,これら酸化物は定量的に分解回収されていることが明らかとなった.
The observations of solid-liquid interface morphology of InSb single crystals pulled by using various oriented seeds is described. Experimental results indicate that the external forms of crystals as well as the formation of growth twin are closely related to the development and properties of {111} facets on the solid…
The chromatographic properties and the structure and texture of thermally treated silicagels have been studied. Commercial silicagels (Partisil and Lichrosorb) were thermally modified at 300, 400, 500, 600, 700, 800 and 900°C. The evolution of specific surface, pore volume and distribution of mean pore diameter as a f…
This paper reports on simultaneous domain structure observations and Barkhausen effect measurements in ferroelectric and ferroelastic NaH3(SeO3)2. It is found that two different types of Barkhausen jumps are discernable originating from realignments in ferroelectric and ferroelastic domain structures respectively. Wit…
The determination of void volumes from transmission electron micrographs is an essential part of evaluating the void swelling in irradiated materials. Three commonly-used methods of determining the void volume are investigated. The apparent change in the volume of octahedral voids in f.c.c. metals with orientation and…
Abstract Parts of a stainless steel limiter used in the T‐10 tokamak for about 1000 discharges have been analyzed by several standard analysis techniques as SEM, EDS, SAM, AES, RBS and SIMS with respect to modifications of surface structure and chemical composition. Erosion phenomena due to melting and evaporation, ar…
The equation of state for Lennard-Jones matter has been investigated by molecular dynamics. A crystal-liquid instability is encountered, on expansion, at a density which increases slightly with temperature. No similar liquid instability is found on compression, which instead ultimately leads to a glass transition.
The proportions of fibroin mRNA synthesized in the posterior silk gland of the flimsy cocoon mutant (flc) of Bombyx mori at days 3, 4 and 5 of the fifth instar were 1.2 %, 0.7 % and 1.8 % of the labeled total RNA, re-spectively, whereas those in heterozygous larva (+/flc) at the same stages were 1.6 %, 3.2 % and 8.5 %…
An improved, one-step synthesis for Fe(CO)5 designed for use with 57Fe is presented. This method allows for easy recovery of the unreacted starting material, requires low pressures, and avoids the use of specialized equipment.
Enthalpies of proton dissociation δHa of poly(acrylic acid) at three different temperatures have been determined as a function of the degree of dissociation α. Despite the apparent increase in pKa with increasing α, the enthalpy of proton dissociation decreases with increasing α, reaching an almost constant value arou…
Developmental changes in the fine structure of the posterior silk gland cells were studied with a recessive mutant of Bombyx mori named flimsy cocoon (flc) whose cocoon-shell weight is much less than that of the normal strain of B. mori. The flc posterior silk gland develops normally until 60 h after the fourth ecdysi…
The synthesis of UN from UO2 through carbide by oxide-carbide-nitride process has been studied in an NH3 stream and a mixed H2 and N2 stream at temperatures 1,400-1,750° C. Uranium mononitride is produced from the carbide by the following four stages: (1) deposition of free carbon, (2) deposition and removal of free c…
Thick film conductors based on Al, Cu and Ni have been studied. Because of its high depth of field, a SEM was used to study the microstructures of the fired conductors. Because of the very small size of the particles in commercial Cu pastes the neck growth forms part of the grain growth mechanism. The bonding between…
The experimental literature on the phase equilibria of the Al-Fe-Ni system has been reviewed. Recommended projections of the solid-liquid equilibria are based upon a compromise between experimental data for the isothermal contours and established points for binary and ternary invariant reactions. The nature of the equ…
Zinc amalgam or electrochemical reduction of porphyrinatoniobium(V) oxide acetates leads to porphyrinatoniobium(IV) oxides, which are characterized by their e.s.r., i.r., and u.v.–vis. spectra.