Materials Literature
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For pt.I see ibid., vol.11, no.17, p.3578 (1978). The authors studied the behaviour of systems undergoing structural transformations between commensurate and incommensurate ordered phases. They reviewed the theory developed by McMillan, and by Bak and Emery (1976) in which the order parameter for such phase transition…
We calculate the charge distribution $\ensuremath{\rho}(z)$ and Fermi-level distribution among the different graphite layers in a lamellar graphite acceptor compound. The charge distribution is highly nonhomogeneous and, because of the semimetallic nature of graphite, nonlinear effects are important. The calculations…
Coefficients have been determined for Berger's two-parameter formula for the Eisenhauer-Simmons gamma-ray buildup factors in ordinary concrete.
A detailed investigation was made, using Kerr effect cinematography, of the domain wall motion during cyclic magnetization in single crystals of a 3% Si-Fe alloy. At low levels of peak magnetic induction and magnetization frequency the midpoint of each slab-like domain remains stationary. With the onset of domain nucl…
There is an increasing demand both for thermoplastic and thermoset resins which, depending on the application, must exhibit one or more high performance characteristics. The resin chosen for a particular application must not only meet the end requirements but also must have good processing characteristics. High perfor…
Rotational hysteresis has been studied at very low rotational speeds in nearly isotropic polycrystalline materials. Measurements were made on disc shaped samples of pure iron, 1.2% C steel and mild steel. The magnitude and direction of the moment were measured as the disc was rotated starting from an initial magnetiza…
This paper is concerned with the study of the effect of hydrostatic pressure up to 1500 bar on the frequency spectra of polycristalline spinel ferrites. In the audio-frequencies range, this study, at different temperatures, had led to find a general hyperbolic law for the variation of the initial susceptibility versus…
The purpose of this work is to correlate solidification rate during a controlled cooling and magnetic properties of columnar Alnico 8 or Ticonal 1500 (Al 7.5%, Ni 14%, Co 35%, Cu 3%, Ti 4.3%, Nb 1.2%, Fe bal). Our investigations involved a controlled solidification with vertical zone melting furnace, micrographic exam…
We investigated when the reflectance R(p) for p-polarized light becomes exactly zero in an attenuated-total-reflection configuration where surface plasma waves at a metal–dielectric interface are excited. We particularly studied the reflection from coated metal mirrors at infrared wavelengths, where the complex refrac…
Abstract The relative position of the phase boundary curves and changes in group chemical composition have been studied, in a single stage extraction system, with three solvents for medium viscosity, raw dewaxed lube distillate. Results obtained indicate that solvents with hydrogen‐bonding tendency show low critical s…
Electron paramagentic resonance (EPR) studies of Gd3+ in single crystals of Ln2(SO4)3⋅8H2O (where Ln=Pr, Nd, Sm, Dy, and Er as well as Y) have been carried out at 9.4 GHz and 297 K. The spin-Hamiltonian parameters have been evaluated for each host. An empirical, linear relationship is found to exist between the magnit…
Abstract Moisture‐cured polyurethane films have been prepared by reaction between toluene diisocyanate and castor oil or derivatives such as castor oil diethanol amide, castor oil monoglyceride, ethylene glycol monoricinoleate, and propylene glycol monoricinoleate. Effect of acetylated castor oil as an internal plasti…
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…