Materials Literature
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A method for calculating the magnetizing and coupling fields, anisotropy field, and demagnetizing factors in various thin-film anisotropic structures is presented. Single-stripe and multistripe structures are investigated. A generalized method for calculating the magnetization in thin-film structures with arbitrary sh…
Silicon nitride and sialon ceramics are receiving a great deal of attention as potential high temperature structural materials for engines and other demanding applications. The sintering behaviour and high temperature preformance of these ceramics is strongly influenced by the sintering additives, impurities and powde…
The response of a blue SrS:CeF/sub 3/ AC thin-film electroluminescent display device to a pulsed voltage train is marked by a luminescence peak at both the leading and trailing edges of the pulse. The height of the leading peak is less than that of the trailing peak at low (near threshold) voltages but grows much larg…
This experiment provides an interesting and visually stimulating study of the different colors and shapes of crystals of transition metal dimethylglyoxime complexes.
It has been demonstrated that pitting attack on aluminium brass condenser tubes, due to aggressive estuarine water, can be halted by adding to the cooling water suitable amounts of an oxidising agent without injection of ferrous sulphate. Acid cleaning and prepassivation with benzotriazole are followed by continuous c…
Mechanistic studies of methanol decomposition on Ni/SiO2-MgO were performed by use of deuterium isotopic species. In the exchange reaction of methanol with a deuterium molecule, one hydrogen in methanol was much more readily exchangeable than the other hydrogen atoms, suggesting that dissociation of methanol to form a…
Abstract To achieve the highest resolution in the scanning electron microscope (SEM) or in the scanning transmission electron microscope (STEM), the sample must be mounted in the high‐field region of a condenser‐objective lens. A secondary electron (SE) image can then be obtained using a collector before the lens. It…
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Abstract Different cellulose reactions are influenced by the various structural parameters of the cellulose (structure of pores and fibrils, crystallinity, hydrogen bonds) in different way. For that reason accessibility and reactivity of cellulose are no absolute but only relative parameters. The lines of the 13 C‐NMR…
Static tensile properties of as HIP’ed Ti-Fe alloys and heat treated Ti-Fe alloys after HIP were studied, and metallographic and fractographic observations were also carried out by means of the back scattered electron images and a scanning electron microscope.Despite the low level of oxygen content, the HIP’ed specime…
A high N.A. i-line lens and a field-by-field leveling system have been developed. Resolution of the lens is better than 0.65 μm. The leveling system has achieved ±0.3 uμ/field on an experimental basis.
The basic characteristics of cellulose triacetate (CTA) film dosimeter have been investigated with 5, 8, and 15 MeV proton beams. The optical density change per unit absorbed dose for 8 and 15 MeV protons is the same as that given for electron beams, but a little smaller for 5 MeV protons. The CTA dosimeter was found…
Polarised neutron-diffraction experiments on the Pccn polymorph of deuteriated cis-[FeIII-(bipy)2Cl2][FeIIICl4](bipy = 2,2′-bipyridyl) gave 402 unique magnetic structure factors collected with magnetic fields almost parallel to the c and b crystal directions. These data were analysed using a valence-orbital model invo…
The characteristic features of flash-butt welded and kindred joints and the defects which occur in them are reported. The mechanisms of their formation, the effects which they have on the quality of the welded joint and the possible methods for their avoidance are discussed.
X.p.s. binding energies and Auger-electron kinetic energies of some Ni-exchanged montmorillonites have been measured. The results are discussed in terms of the bonding states of the elements and their relation to the montmorillonite structure. It is shown that the preparation procedure influences the chemical and stru…
Using the χ 2 ‐test a statistical method is described, which allows a clear decision whether a given distribution of orientation relationships between adjacent grains is random or not. The validity of this method even for small numbers of orientation relationships, as obtained from electron microscopical measurements,…
Sm-Co-Cu-Fe-Zr phase diagram near compositions of magnet alloys, that is, Sm-Co-7.0 at%Cu-22.0 at%Fe-(0, 1.4, 2.0 and 3.0 at%)Zr sections of the phase diagram were determined in the Sm content range from 6 to 16 at% above 1073 K, and effects of Zr on the phase transformation and magnetic properties of the magnet alloy…
The structure of D1.65MoO3 has been refined in the space group C2/m. Half of the deuterium in D1.65MoO3 has been localized using powder neutron diffraction, the other half being dispersed on numerous sites throughout the structure. Insertion of deuterium in the MoO3 network produces only weak structural modifications.
A new measurement cell for very small quantities of liquid crystals is used for the determination of the complex permittivity of the cyanobenzylidene p' octyloxyaniline (CBOOA). The dielectric behaviour in the nematic and smectic-A phase is given as a function of an applied electric field (static and alternative) as w…
Results are presented for the influence of tensioning weight, number of wraps, wrap angle, cyclic stroke, and cyclic speed on the cycles to failure of two nylon and two polyester–fibre yarns, wet and dry, in a yarn-on-yarn abrasion test, which involves a reciprocating motion between two helically wrapped yarn sections…