Materials Literature
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In order to explain the influence of carbon on the embrittlement of 12%Cr steels, a systematic study of the effects of tempering on AISI 410 steel was carried out. Reversible temper embrittlement was detected and related to the mechanical properties and microstructural variations and to the segregation of carbon and a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer and Raman spectra of carbon-supported iron phthalocyanineCarlos A. MelendresCite this: J. Phys. Chem. 1980, 84, 15, 1936–1939Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980https://pubs.acs.org/doi/10…
The defect microstructure of electron-irradiated α-quartz was studied by transmission electron microscopy. Formation of heterogeneously-nucleated disordered strain centers and a homogeneous crystalline → amorphous transformation of the surrounding matrix were observed. Both features are shown to be attributable to rad…
Positive carbon-containing electrodes conveying 5 or more microA of constant direct current per cm2 showed bactericidal activity on intact back skin of 13 human subjects. This effect increased with the duration of stimulation up to a total surface bacterial kill at 20 h. When total current and current density were var…
The Raman spectra of NH4I and ND4I are reported at pressures up to 130 kbar and the II–IV transition in this compound is observed to occur at 27(5) kbar at room temperature. The Raman spectral changes which characterize this transition are very subtle and it is concluded that a considerable amount of disorder can stil…
Abstract Cold‐drawn and hot‐drawn samples of poly(ethylene terephthalate) were studied by means of measurements of shrinkage stress, birefringence and differential scanning calorimetry (DSC). The values of shrinkage stress were comparable for both types of sample, implying that the deformation of a molecular network i…
Abstract A new one‐dimensional model for penetration analysis of a rigid projectile into a soil target is presented. The soil medium is represented by a set of discs of constant thickness, responding in the radial direction under plain strain regime. When penetration through a typical disc occurs, the projectile displ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of (5,10,15,20-tetra-N-propylporphinato)lead(II): a "roof" porphyrinK. M. Barkigia, J. Fajer, A. D. Adler, and G. J. B. WilliamsCite this: Inorg. Chem. 1980, 19, 7, 2057–2061Publication Date (Print):July 1, 1980Publication History Published on…
Abstract The prediction of the lifetime of a polymer by extrapolation from weight‐loss data requires a thorough analysis of degradation kinetics over a wide temperature range. Techniques are described in which entire kinetic spectra are compared among experiments performed at heating rates from 6 deg/min to 9 deg/day.…
ABSTRACT The mechanical behavior of selected food powders was studied by an Instron UTM through compression, decompression, and stress relaxation tests. Powders in moist or cohesive state were considerably more deformable than in dry or noncohesive state. Upon decompression, cohesive powders remained compacted while t…
This paper presents an extension of the penetration theory proposed by the National Defense Research Committee (NDRC). The extension is based on experimental studies, performed over the last few years and covering projectiles with lower impact velocities and larger diameters and weights than originally considered by t…
A simple test based on intensity statistics is presented for the detection of twinning by merohedry. Using relationships derived in the text, the twinning fraction of a crystal may be estimated from the intensity probability distribution. Unlike most methods for the detection of twinning, application of this test does…
Inactivation rates for nine enzymes extracted from Bacillus cereus spores were measured at several temperatures, and the temperature at which each enzyme had a half-life of 10 min (inactivation temperature) was determined. Inactivation temperatures ranged from 47 degrees C for glucose 6-phosphate dehydrogenase to 70 d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of Polystyrene at the θ TemperatureAkira Takahashi, Masami Kawaguchi, Hideyuki Hirota, and Tadaya KatoCite this: Macromolecules 1980, 13, 4, 884–889Publication Date (Print):July 1, 1980Publication History Published online1 May 2002Published inissue 1 July 1980http…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer/Polymer Diffusion. 2. Effect of Temperature and Molecular Weight on Macromolecular Diffusion in Blends of Poly(vinyl chloride) and Poly(ε-caprolactone)P. T. Gilmore, R. Falabella, and R. L. LaurenceCite this: Macromolecules 1980, 13, 4, 880–883Publication Date (Print…
The solid products of decomposing CaCO 3 powder in vacuum at 510°C (sr‐CaO) and of decomposing Ca(OH) 2 powder at 320°C in vacuum (h‐CaO) are particles which have approximately the same exterior dimensions as the parent CaCO 3 or Ca(OH) 2 particles. N 2 adsorption and desorption isotherms show that sr‐and h‐CaO have h…
A study was made of the overpotential and product selectivity characteristics of the high temperature solid electrolyte fuel cell It was found that is the primary oxidation product, although significant amounts of by‐product are also formed due to the catalytic reaction between and on Pt. The influence of this side re…
Abstract The relation between the relaxation behaviour of photochromic aromatic azo benzenes and spiropyrans in a series of amorphous polymers and the polymer properties has been investigated. The distinctive differences of the rate of thermal isomerization found below and above T g and also compared to solution can b…
Synthesis of LaAl 11 O 18 by the solid‐state reaction of La 2 O 3 and Al 2 O 3 occurs in two stages, i.e. LaAlO 3 forms immediately at 1450°C in air but LaAl 11 O 18 formation is very slow and requires up to 141 days. First‐order kinetics were observed and an activation energy of 118±4 kcal was calculated. Formation o…
R‐T and I‐V characteristics of single grains and grain boundaries in large‐grained BaTiO 3 PTC ceramics were studied with a two‐probe technique using a micromanipulator and fine Al wire. The PTC originates in the grain boundary only and behaves differently in each boundary. Even below T c , the ceramic resistance depe…