Materials Literature
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Rates of K absorption by young barley plants grown for 20 days in flowing nutrient solutions have been studied at 3 solution K concentrations (20, 200, and 2000 mum) and at 2 Ca concentrations (250 and 2500 mum). Increasing solution K increased plant K content, concentration, and rate of absorption: solution Ca concen…
Measurements of the specific heats of NaF and CsBr between 20 and 300 °K are reported. The results are believed to be accurate to within 0.5% down to 60 °K, falling to 2% at 25 °K. The Grüneisen parameters γ = β V/C V χ T = β V/C P χ S of NaF and CsBr have been calculated from the present heat capacity measurements in…
Magnetocrystalline anisotropy in gadolinium has been studied utilizing a spin-wave model in which a crystal field of hexagonal close-packed symmetry and magnetic dipole-dipole interactions are treated as a first-order perturbation to isotropic exchange. Corrections to the temperature dependence of K 1 , due to normal…
The denaturation of enzymes in solution by cavitating ultrasound has been reported previously. This report presents the results of an extensive study of the effects of noncavitating ultrasound on solutions of α-chymotrypsin, trypsin, aldolase, lactate dehydrogenase, and ribonuclease. In one set of experiments, the sol…
Data on the electrical, optical, magnetic, and structural properties of ${\mathrm{Ti}}_{2}$${\mathrm{O}}_{3}$ are reviewed; the differences between the transition encountered in ${\mathrm{Ti}}_{2}$${\mathrm{O}}_{3}$ and ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ are particularly stressed. Perusal of the available experiment…
Liquidus phase equilibrium data are presented for the system Al 2 O 3 ‐Cr 2 O 3 ‐SiO 2 . The liquidus diagram is dominated by a large, high‐temperature, two‐liquid region overlying the primary phase field of corundum solid solution. Other important features are a narrow field for mullite solid solution, a very small c…
The irradiation damage configuration and yield stress response obtained in the c.p.h. α’and α phases in a Zr-2·7% Nb alloy after fast neutron irradiation have been studied as a function of pre-irradiation solute distribution. Largest yield stress increments were obtained for specimens irradiated with the solute initia…
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…