Materials Literature
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Dislocations in solution-grown ZnSe were observed to climb when exposed to a focused 100-kV electron beam in an electron microscope. The resulting dislocation networks are complex and are generated in a three-step sequence: (1) existing dislocations extend their length by forming dipoles, (2) a thin layer of radiation…
The thermal oxidation of natural rubbers from Hevea brasiliensis (pale crepe and smoked sheet) and Parthenium argentatum (Guayule) were studied with differential scanning calorimetry (DSC) using the dynamic method. The atmosphere was oxygen at 110 ml/min and the temperature range was 393° −473°K. The decomposition rea…
Abstract A new instrument for measurement of extensional viscosity was designed and employed in the evaluation of SBR compounds containing carbon black and other non-black fillers. It was shown that carbon black filled rubbers generally do not reach steady-state viscosity ; the stress continues to increase with increa…
Experimental data, and their correlation with predictions from theory, are presented for the thermal design of a countercurrent heat exchanger for heating or cooling blood. The thermal design considers the influence on the Nusselt number of blood and the heat exchanger effectiveness of variables such as the blood flow…
Summary The relationship of geomorphic and climatic history and formation of the ferruginous soils, formed on the acidic Peninsular Gneiss, of the Mysore Plateau, India, is discussed. The profiles studied are found on two different land systems. The soils of the older, fairly smooth landscape are composed of colluvium…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe thermal reaction of vinylcyclopropylidene to cyclopentenylidene. An exploration of the electronic hypersurfaceW. W. Schoeller and U. H. BrinkerCite this: J. Am. Chem. Soc. 1978, 100, 19, 6012–6017Publication Date (Print):September 1, 1978Publication History Published onl…
Summary Full chemical analysis, cell dimensions, γ refractive index, density, and infra-red absorption spectrum have been determined for fourteen stilpnomelanes. Coupled with data from previously described material and electron probe analyses of three further samples, the new information shows that γ = 1·616+0·0047 Fe…
Abstract Moisture and mineral concentrations and calorific values of cattle dung pats were studied under field conditions. The rate of moisture loss from dung pats varied according to the season but the dung was rarely re‐wetted by rainfall. Soluble mineral ions were only leached from pats by prolonged rainfall. Magne…
Abstract Die Infrarot‐Spektren einer Reihe von Doppeloxiden des Typs MTiO 3 (mit M = Mn, Co, Ni, Zn, Cd und Mg) mit Ilmenit‐Struktur wurden aufgenommen und an Hand einer Faktorgruppen‐Analyse diskutiert. Es wird bewiesen, daß an den beobachteten Schwingungen alle Atome der Elementarzelle beteiligt sind.
The anodic oxidation kinetics and electrochemical properties of the passive surfaces of Ti, Ni, and Ti‐Ni alloys (0.2–37.5 w/o) in ( p H 5.6 and 10.6) solutions with and without redox couples have been investigated by electrochemical methods. Measurements have been made also on single crystals of (n‐type) and (p‐type)…
In connection with freezing, dynamical behaviour of (metastable) liquids is studied based on the nonlinear diffusion equation (ND eq.) derived in a previous paper. From the ND eq., an H -theorem for the free-energy functional \(\mathscr{F}(N(\mbi{r},t))\) of Brout is derived in the form \(\mathrm{d}\mathscr{F}(N(\mbi{…
Magnetoelastic interactions in amorphous rare earth-3d transition metal thin films are analysed. The calculations are based on the anisotropic pair ordering model. Pair energy is expressed in the pseudodipolar form. It has been shown that magnetoelastic tensor consists of two parts:isotropic and anisotropic. The case,…
As in chiral nematic liquid crystals, one of the most striking optical properties of chiral smectic C liquid crystalline phases is the selective reflection of certain wavelengths of light. This Bragg-like scattering is a direct consequence of the periodic nature of the helical structure of these phases. In chiral nema…
Thin films of iron were prepared by condensation from the vapour phase onto a liquid helium-cooled substrate. The 'as deposited' films possessed large resistivities similar to that of liquid iron and were ferromagnetic. The extraordinary and ordinary Hall coefficients of the films were measured and were found to be of…
A computational method to deduce depth profiles of elements from the dependence of the spectral intensity on angle has been formulated. The method is formulated as the minimization of the sum of the squares of the differences between experimental and theoretically expected relative intensities at all data points subje…
Rotational power losses per cycle Pr/f have been measured as a function of rotational frequency f, between about 0 and 25 Hz, on grain oriented and isotro pic 3% SiFe, under different magnetization conditions, up to almost complete saturation. Loss measurements were performed from the rate of change of the angular vel…
The successive phase transitions in K 2 PbCu(NO 2 ) 6 have been studied by precise X-ray and neutron measurements. In phase II, we have observed the satellite reflections at ( H ±0.416, K ±0.430, 0) around each fundamental Bragg reflection. In phase III, we have observed the superlattice reflections, instead of the sa…
Solution experiments were conducted in which basic aluminum sulfates were precipitated from dilute solutions of various concentrations of sulfate and potassium at different pHs. Aging of precipitates at 50°C for 18 weeks resulted in crystalline precipitates of gibbsite, basaluminite, alunite, or mixtures of these mine…
Single crystals of activated with Nd 3+ were studied by high resolution selective site laser spectroscopy. The optical properties of Nd 3+ ions located at various inequivalent sites were correlated with Nd 3+ site symmetries obtained from electron spin resonance (ESR) measurements and also with the polarizations predi…
Results from isothermal ageing of a commercial nickel-base alloy are presented. Particle sizes are determined by electron microscopy. The particle coarsening is found to obey the Lifschitz-Wagner theory. The volume fraction of γ′ particles is 0.15. The proof stress is determined for a series of ageing times. The Taylo…