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Single crystals of yttrium phosphate doped with Eu3+ were investigated by means of polarized emission and absorption spectroscopy. The spectra are consistent with the known D2d site symmetry of the Eu3+ ion, and most of the observed transitions have been assigned. The energy-level structure of the 7F multiplet and the…
Increasing concentrations of K (20, 200, 2000 mum) in the nutrient solution depressed Ca content and concentration in barley plants growing in nutrient solutions of low Ca concentrations (250 and 2500 mum). Increasing K from 20 to 200 mum depressed Ca absorption more than increasing K from 200 to 2000 mum K.The strong…
The optical absorption associated with charge carriers in NiO and CoO has been obtained from transmission measurements on pure and Li-doped crystals in the wavelength region 0·5 to 700 μm, at temperatures between 100 and 500°K. The absorption increases smoothly with frequency to a maximum near 1 ev and then shows a fu…
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Abstract The surface properties of a range of aluminas, obtained by calcination of crystalline and gelatinous aluminium hydroxides at temperatures from 300° to 1000° and characterised by X ‐ray powder diffractometry, have been examined by nitrogen adsorption. On calcination the hydroxides exhibited two distinct types…
The ferromagnetic Curie temperature of EuO films has been increased by selective doping with trivalent rare-earth oxides. The electrical resistivity, which depends upon the temperature and has a broad peak at ≈100°K, decreases markedly to ≈10−1 Ω·cm with doping. A typical ferromagnetic Curie temperature, determined fr…
As part of a long range study to develop grades of steel with improved resistance to hydrogen-induced cracking, techniques for measuring hydrogen uptake and hydrogen permeability were investigated and these parameters were correlated with resistance to hydrogen-induced cracking at different strength levels. The steel…
The equilibrium P-T curves for the following have been determined: albite = jadeite + quartz; albite + nepheline = 2 jadeite; analcite = jadeite + water. The curves for albite = jadeite + quartz is P(bars) = 6800 + 18.6 T degrees C. The reaction albite + nepheline = 2 jadeite is shown by P(bars) = -4000 + 25 T degrees…
The self-diffusion of 14C in TiC0.67 was studied in the temperature range 1745°–2720°C. The diffusivity, which exhibits a discontinuity at 2080°C, can be represented by two expressions: D0.67*=(2.85±0.20)×10−4exp[−(49 600±300)/RT] cm2/sec above 2080°C and D0.67*=(1.14±0.66)×102exp[−(109,900±2000)/RT] cm2/sec below thi…
A method is described for location of proteins in bacteria. It depends upon two techniques. One technique is the inactivation of the protein by a reagent which is incapable of penetrating the bacterial membrane (permeability barrier). Proteins inside this membrane cannot be inactivated unless the cells are disrupted;…
The range of existence of the cubic phase in the system CaO‐ZrO 2 was determined at temperatures from 1300° to 1700°C, using the lattice parameter method. This technique could not be used at higher temperatures because of anomalous changes in the lattice parameter. The possibility of the existence of a compound, CaZr…
Abstract In continuation of an earlier preliminary study, some further physical and synthetic studies on the homogenous phase condensation of pyrrole and benzaldehyde to ms ‐tetraphenylporphin in acidic media were undertaken. The role of atmospheric oxygen in the reaction was studied in some detail. The effects of aci…
Abstract Either of the two endothermic melting peaks found by differential thermal analysis of nylon 66 may be converted to the other by appropriate choice of annealing conditions. The two peaks are considered due to the melting of two morphological species, forms I and II. Form I is relatively fixed in melting temper…
The Preliminary Check-list of British Marine Algae (Parke, 1953), with three subsequent lists of additions and corrections (Parke, 1956, 1957, 1959), was superseded by the Revised Check-list of British Marine Algae (Parke & Dixon, 1964). Since the publication of the latter, changes, both taxonomic and systematic,…
1. The effects of acid mucopolysaccharides and acid mucopolysaccharide-proteins on the size and rate of formation of fibril aggregates from collagen solutions in pH7.6 buffers were studied by turbidimetric and light-scattering methods. 2. Serum albumin, orosomucoid, methylated cellulose, chondroitin sulphate A and cho…
The finite pertubation method developed in the first paper of this series is applied to isotropic nuclear-spin coupling constants, assuming that only a Fermi contact mechanism couples the electron and nuclear spins. Results for some simple systems are calculated using self-consistent molecular orbital methods involvin…
A rate of 0.3 failures per billion hours or less is desirable for memory components in large integrated arrays. This unusually stringent requirement complicates the determination of lifetime from accelerated aging studies. The value and limitations of step stress aging techniques are discussed in terms of experimental…
Masamichi Tsuboi, Minoru Terada, Teruo Kajiura; Raman Effect in Ferroelectric Sodium Nitrite Crystal, Bulletin of the Chemical Society of Japan, Volume 41,
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnthalpy of formation of Nd2O3-hexagonalGeorge C. Fitzgibbon, Daniel. Pavone, and Charles E. HolleyCite this: J. Chem. Eng. Data 1968, 13, 4, 547–548Publication Date (Print):October 1, 1968Publication History Published online1 May 2002Published inissue 1 October 1968https://…
The corrosion behavior of plain carbon steel in high temperature water has been studied using electrochemical polarization techniques. The influence of oxygen, hydrogen, and ammonia on the corrosion behavior has been studied over the range < 0.1-100 ppm. Potentiostatic anodic polarization data indicate that onl…