Materials Literature
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Synopsis-A quantitative method for measuring and comparing the effect of various cos-metic treatments and products on the amount of FORCE needed to COMB a tress of HAIR is described. Photographs of the apparatus and a detailed description of the experi-mental procedure are provided. The results of several experiments…
The kinetics of desorption of surface oxide as CO and CO2 from graphite have been followed, using a mass spectrometer system, allowing their activation energies of desorption to be measured as a function of the amount desorbed. After the initial degassing of the graphite, surface oxide was reformed by chemisorption at…
Hydrogen overpotential on zinc uniformly alloyed with 500 ppm Cd, Fe, Ca, and Mn, as well as 200 ppm Hg, were measured in at room temperature. Exchange current densities and transfer coefficients for each alloy for the hydrogen evolution process were obtained. Except for Cd, all the other impurities including Hg will…
The emission characteristics of phosphors based on alkaline earth tellurates as host lattice are described. The fluorescence of hexavalent uranium in compounds of the formula M n TeO 3 + n with n = 2 or 3 , was studied. The spectral energy distribution of the fluorescence is affected by the cationic species and crysta…
The nucleation and growth kinetics of voids and interstitial dislocation loops in irradiated metals is theoretically considered. Taking into account a slight dependence of void swelling on the void concentration the void and dislocation loop nucleation rates are approximated by expressions allowing an analytical treat…
Photographic Techniques for Optical Microscopy and Macroscopy.- Specimen Preparation Methods for Microstructural Analysis.- Quantitative Stereology for Microstructural Analysis.- Devices for Quantitative Analysis.- Scanning Electron Microscopy for Microstructural Analysis.- High Voltage Electron Microscopy for Microst…
Abstract Two methods for the determination of oxalic acid were collaboratively studied. In both methods, the oxalic acid in spiked and unspiked spinach is precipitated as calcium oxalate from a buffered (pH 4.0–4.5) solution. The precipitate is separated from the solution by centrifuging 15 min at 1700 rpm. The oxalic…
The enthalpies of formation from Na(s) and WO3(s) of two cubic phase sodium tungsten bronzes. Na0·53WO3(s) and Na0·77WO3(s), have been determined by solution calorimetry. The thermodynamic stability of the cubic phase towards oxidation and disproportionation is discussed.
The reactions occurring during the anodic polarization of tinplate passivated cathodically in a dichromate solution (CDC tinplate) were ascertained by applying Faraday's law to analyses of the oxidation products generated. It was found that a large portion of the CDC passivation film consists of chromium in the metall…
A review of studies of photoconductivity in the ferroelectric-semiconductors SbSI and BaTiO3 is given and the results are discussed. In the short wavelength region of the spectrum there is an “extrinsic” photoconductivity of the ferroelectric due to the effect of the strong surface electric field on the nonequilibrium…
Abstract Die Isomorphiebeziehungen bei den Heptahydratsulfaten von Mg 2+ , Zn 2+ , Ni 2+ , Fe 2+ und Co 2+ werden untersucht. Es wurde festgestellt, daß wenn die Endglieder der betrachteten isomorphen Reihen in gleichen Strukturen kristallisieren, eine lückenlose Reihe der Mischkristalle existiert. Wenn die Endglieder…
Crystals of the title adduct are triclinic, space group P, with a= 14·347 ± 0·004, b= 13·194 + 0·002, c= 9·461 ± 0·001 Å, α= 72·50 ± 0·02, β= 114·70 ± 0·01, γ= 114·12 ± 0·02°, Z= 2. The structure was refined by least-squares methods to R 0·047 for 2829 observed intensities measured by diffractometer. The analysis show…
Results from elevated temperature-strain controlled fatigue and constant-strain-rate tensile tests conducted on specimens of stainless steel Types 304, 304L (titanium modified), 316, as well as Incoloy 800 are reported. Specimens were irradiated to fluences of 0.4 to 5 × 1022 n/cm2, E>0.1 MeV at 700 to 750 C (1…
Enzyme-solubilized collagen was cast into films with different fibrillar structures and cross-linked with glutaraldehyde. Cross-linked films had decreased swelling ratios, decreased degree of hydrolysis, increased resistance to bacterial collagenase, and increased shrinkage temperatures. Subcutaneous implantation in r…
Single crystals of with dislocation and inclusion levels below 5/cm 2 were grown in a nitrogen atmosphere with an infrared television system of computer controlled Czochralski crystal growth. Coring was prevented by a high crystal rotation rate and a slow pull rate during growth, although striations occurred in the cr…
Using room temperature diffractometer intensity data the structure of Rb2TeCl6 has been determined by single crystal X-ray diffraction and refined to a final R of 0·050. The structure consists of regular octahedral [TeCl6]2–[Te–Cl = 2·541 Å(corrected)]. Lattice energy calculations on the resulting structure (for vario…
Ultraviolet high sensitivity reflection spectra of the copper electrode surface have been measured in situ under the potentiostatic polarization in 3% NaCl aqueous solution. In the deaerated nearly neutral 3% NaCl solution containing 0.0002 M BTA (benzotriazole), BTA-Cu (I) (benzotriazole-cuprous salt) film was formed…
Compressive surface stresses were formed in hot‐pressed Al 2 O 3 by quenching. Flexural strength was improved substantially, up to a maximum of 223,000 psi. The variation of strength with grain size of the quenched bodies was similar to that of the unquenched material, but the strengths were shifted to higher values.…
The influence of dislocation behaviour on void formation and growth has been studied in the High Voltage Electron Microscope (HVEM). Variation of the interstitial loop density has been used to control the concentration of biased linear sinks available for point defects, and thereby the vacancy excess required for void…
Abstract The kinetics for dehydrochlorination and benzene formation has been studied during the degradation of two samples of poly(vinyl chloride) (PVC) at 180–200°C under vacuum with and without the removal of hydrogen chloride. The effects of various additives, such as organic phosphites, mercury, silver, gold, and…