Materials Literature
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Shape memory alloys are characterized by a thermoelastic martensitic transformation and the presence of ordering in the parent phase and martensite. Crystal structure studies of parent and martensite phases in a CuAlMn alloy show that a thermoelastic transformation from an or- nered parent phase of DO3 type to an M18R…
The earliest substantial experimental work to grow diamond from gaseous phase at low pressure was disclosed by Eversole of UCC in 1962 and independently by Russian team of Derjaguin. Recently, the diamond film and particles with well-define habites were synthesized by Spitsyn and his co-warkers by the chemical transpo…
A washing method was developed to import beneficial mechanical effects to sheets of soiled cotton fabric, fabric deformation clash of the fabric against wire gauze and penetration of a liquid flow through the fabric. This method consists in pulsating flows of through the fabric placed between two wire gauzes set in a…
Søderberg selfbaking electrodes are used to conduct electric current into the electric reduction furnace. Two-dimensional computer models for the computation of temperatures, electric currents and thermal stresses have been used for a long time in the R&D effort to improve the construction and operation of the ele…
Experimental Results on the rotatory power of a stresed Cholesteric Liquid Crystal are reported. The dependence on the applied strain is measured and a critical dependence on the light wavelenght is shown. Applications of this effect to optical modulation is also reported.
The use of olivine sand as a molding material is limited in comparison with silica sand, and its characteristics are not sufficiently known. The previous papers by the authors described that the olivine sand mold prevented burning not only in the case of high manganese cast steel but also of low carbon cast steel. Met…
Some physical as well as chemical factors would take part in the appearance of corrosion morphology of metals in humid environment. In this paper, some cases of corrosion on the copper alloy were demonstrated which were caused by the capillary action due to superficial structure of the metal. A model was proposed in w…
Paramagnetic metal chelates including Fe-EDTA, Fe-CDTA, Fe-DTPA, and Gd-DTPA were compared as intravenous urographic contrast agents for magnetic resonance (MR) imaging in rats. Each compound, administered intravenously at three different doses (0.05, 0.1, and 0.2 mmol./kg.), was rapidly excreted through the kidneys y…
One synthesis of N-alkyl-N′-(4-acylphenyl)piperazines and their physical properties have been studied using calorimetric, optical, and X-ray crystallographic methods. The compounds exhibit only smectic phases, the higher-temperature phase being a probable smectic B. The lower-temperature smectic is uniaxial but relati…
The interfacial interaction of an ethylene-acrylic acid-t-butyl acrylate (EAA) terpolymer with metals (mild steel) has been studied by spectroscopic techniques (XPS, AES, and IR), SEM, and mechanical testing. Using peel tests it was shown that the copolymerization of small quantities of acrylic acid and t-butyl acryla…
Permeation rates of tritium and hydrogen through iron were measured by the electrochemical method in which an aqueous solution containing 3.7×1012 Bq/m3 tritium was used as a cathodic electrolyte. Tritium and hydrogen were introduced from one side of a specimen by cathodic polarization with a constant current density,…
The use of amorphous ferromagnetic materials for the magnetic circuits of distribution transformers could reduce the losses associated with iron cores and result in substantial economic savings to utilities. The value of such savings obviously depends on the loss evaluation. Optimization calculations show that this va…
All-film type power capacitors with folded electrode foil have been developed and was clarified to have an excellent electric properties and also a reliable lifetime of more than 30 years in service field. According to the electric field calculation, the folded foil can reduce the electric field at the electrode edge…
The X-ray diffraction patterns from second-stage rubidium–graphite, C24Rb, have been measured at high resolution in the basal plane for samples made from oriented, exfoliated graphite. The pattern at 5 K has been indexed on the basis of both a simple static distortion wave and a √43 ×√43 superlattice consisting of nea…
This paper reports a study of the effect of accelerated heat ageing in air on the fracture toughness of two uPVC pipes. The pipes were extruded at 179°C and 195°C respectively and curved fracture toughness specimens were aged at temperatures between 100 and 140°C. After testing at a crosshead rate of 1 mm/min, a simil…
Austenitic stainless steels are not generally thought to undergo ductile-to-brittle transitions as the temperature is lowered to 77 K or to be susceptible to hydrogen embrittlement. However, some austenitic steels do undergo a classic ductile-to-brittle transition, and are susceptible to hydrogen embrittlement even at…
The uniaxial mechanical behavior of shape memory alloys is studied from the phenomenological point of view in the process of stress-induced martensitic transformation or of its reverse transformation. The phenomenological interpretation of the fraction of phase, which is identified as the internal state variable in th…
Treatment of protoporphyrin IX dimethyl ester (12) with benzoyl peroxide affords a mixture of the four isomeric meso-benzoyloxy derivatives (13). These have been separated by h.p.l.c. and distinguished from each other by hydrolysis to the corresponding oxophlorins (oxyporphyrins), insertion of iron to form the oxyhaem…
A thermally stimulated current measurement using a temperature gradient (TG–TSC measurement) has been applied to the study of dipolar depolarization in polymers. TG–TSC in the initial rise region has been theoretically analyzed and the effect of a temperature gradient has been clarified. The theoretical relation betwe…
The interdiffusion coefficient and the ratio of the intrinsic diffusivities with respect to the mole fixed frame of reference in Ag–Cd alloys have been determined by taking the volume change effects into account. The interdiffusivities obtained in this work are in good agreement with those obtained by previous workers…