Materials Literature
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The real refractive index n and power absorption coefficient alpha of high resistivity GaAs and CdTe have been directly measured at 300 K and 8 K in the wavelength region from 12.5 micro to 300 micro. This spectral region contains the fundamental lattice resonance of both materials: 37.2 micro for GaAs and 71.4 micro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of formaldehyde-treated nucleohistoneDouglas Brutlag, Cameron Schlehuber, and James BonnerCite this: Biochemistry 1969, 8, 8, 3214–3218Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published inissue 1 August 1969https://pubs.…
Abstract Surface-area studies were made on several homoionic vermiculites with both nitrogen and carbon dioxide as adsorbates. These studies show that only very slight penetration occurs between individual vermiculite platelets. This is in contrast to an earlier investigation of montmorillonite where it was found that…
Abstract Thin films of polyethylene prepared from blends of fractionated polymer and a linear hydrocarbon ( n ‐C 32 H 66 ) have been used to study the role of intercrystalline links in the deformation of semicrystalline polymer under uniaxial stress. These links have been found to be strong and virtually inextensible…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of the low-spin iron porphyrin, bis(imidazole)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron(III) chlorideRachel P. Countryman, Douglas MacPherson Collins, and James L. HoardCite this: J. Am. Chem. Soc. 1969, 91, 18, 5166–5167Publication Date (Prin…
It is well established that at temperatures above ∼0·3 T m the Cottrell theory relating the critical strain for serrated yielding, ε0, to temperature and strain rate becomes inapplicable. At these elevated temperatures ε0 increases with increasing temperature and decreasing strain rate. These phenomena may be rational…
It has been known that the transition temperature (Tc) of VO 2 is shifted by doping specified elements in VO 2 . In order to shift Tc in still wider range, experiments have been performed with adding various elements. As a result, it has become possible to shift the Tc of VO 2 either towards a higher temperature or to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBiosynthesis of alkanes in Nostoc muscorumJerry Han, Henry W. S. Chan, and Melvin CalvinCite this: J. Am. Chem. Soc. 1969, 91, 18, 5156–5159Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published inissue 1 August 1969https://pubs.acs.or…
Absorption spectra at low temperatures are reported for AmCl3, AmBr3, and AmI3. Bathochromic shifts have been generally observed in the series from the chloride to the iodide. These shifts are comparable to those observed in lanthanide halides. Hypersensitive transitions have been observed in AmI3. A number of new ass…
Abstract A study has been made of the relationship between initial foam height, H, as measured by the Ross‐Miles test, and such factors as surfactant concentration, critical micelle concentration (CMC) of the solute, surface tension (γ) of the solution, surface area (A) of the foam, and the work involved in the produc…
The limit theorems of the generalized theory of perfect plasticity are applied to obtain bearing capacity in two dimensions (strip loading or rigid punch) and in three dimensions (circular and square punches). With the safe assumption that concrete or rock is unable to take any tension, the bearing capacity is shown t…
The dominant radiationles decay channel in crystalline tetracene at 300 °K is a fission of an excited singlet into two triplet excitons with a rate constant γS = 1.5 × 10−12 ± 5% cm3 -sec−1. The efficiency of this process at room temperature is estimated as 95%and constitutesan efficient intersystem crossing mechanism…
The mechanical behavior of OFHC copper at strain rates from 10−3 to 103 sec−1 at 300°, 420°, and 590°K was investigated. The strain rate behavior of copper can be divided into two regions. Below 10 sec−1 the dislocation motion is thermally activated over forest dislocation barriers. Above 103 sec−1, a linear relations…
Abstract Electron microscopic textures of A–B type block copolymers of styrene and isoprene cast from several solvents were investigated by means of the osmium tetroxide fixation technique. The two‐phase structure, i.e., the semimicro heterogeneous structure due to the microphase separation of block segments, was obse…
Abstract X-ray analysis of Li + - and K + -saturated samples, differential thermal analysis (DTA), thermal gravimetric analysis (TGA), and chemical analysis of 83 samples enable a distinction to be made between Wyoming, Tatatilla, Otay, Chambers, and non-ideal types of montmorillonite, and between ideal and non-ideal…
Decalcification at the mantle-shell interface in Mercenaria tnercenaria was studied through the changes in the chemical composition of the extrapallial fluid, and by the measurement of Ca45-deposition and solution. Measurements of O2-tension demonstrated that the clam was anaerobic soon after the valves were closed. M…
Quasifree scattering of electrons on bound electrons gives direct information on the electronic wave functions in atoms and molecules, if the incoming energy is definitely higher than the electron binding energy. To tackle this new line of research the two outcoming electrons, whose energies are typically in the 0.1–1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTParamagnetic shifts in solutions of cholesterol and the dipyridine adduct of trisdipivalomethanatoeuropium(III). A shift reagentConrad C. HinckleyCite this: J. Am. Chem. Soc. 1969, 91, 18, 5160–5162Publication Date (Print):August 1, 1969Publication History Published online1…
The influence of intragranular bubbles, acting as efficient trapping sites, on the migration of fission gas atoms in material under irradiation is assessed. It is considered that the bubbles are unstable due to the operation of an irradiation-induced resolution process tending to dissolve their enclosed gas. Treating…
It is convenient to grasp crystals of a kind as “ferroelastic” crystals. They are defined analogously to “ferroelectric” crystals, mechanical strain and stress in the former corresponding to electric polarization and field in the latter respectively. The order of magnitude of the coercive stress for ferroelastic state…