Materials Literature
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Abstract The thermodynamics of the polymerization of acetone through the carbonyl group has been investigated in an attempt to find the limiting experimental conditions for producing high molecular weight polymer. Approximate values for the entropy and enthalpy of polymerization were estimated empirically from data pu…
Several aspects of electronic transport in nonmagnetic and magnetic transition metal oxides are reviewed. These include high- and low-temperature measurements of conductivity, the Hall effect and the Seebeck effect, and their analysis in terms of the electronic energy structure. Particular emphasis is put on the tempe…
This paper summarizes the results of an analytical study carried out for the purpose of determining the effects of cladding thickness and conductivity on fully developed heat transfer to liquid metals flowing in-line through unbaffled rod bundles. The study is based on slug flow and the assumption that the heat flux o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of trisilane by the Schlesinger methodPeter P. Gaspar, Carl A. Levy, and Gerald M. AdairCite this: Inorg. Chem. 1970, 9, 5, 1272–1273Publication Date (Print):May 1, 1970Publication History Published online1 May 2002Published inissue 1 May 1970https://pubs.acs.org…
Over the last several years, we have witnessed an upsurge in the quantity of research devoted to mesophase formation and properties.1 Of particular interest to chemists is the investigation of molecular structure requirements for liquid crystalline substances, and the variation of mesophase physical properties with co…
The variation of shock-induced phase-transition pressure with alloy composition has been observed for several Fe–Cr and Fe–Cr–Ni alloys through use of the inclined-mirror technique. It was found that transition pressures for Fe–Cr alloys varied continuously from the known 130-kbar value for pure iron to 230 kbar for 3…
Th e c rysta l s tru cture of sy nth e ti c Na2 Co.,, H2O. has been re fin ed us in g 1231 un iqu e x ray dif fr~c tlOn d a ta c~l ec l e d by the peak he ight m ~th o d on a diffractom e te r. R = 0.034. Th e unit ce ll is a -6.474(2), b -1O.724(3) and c=5.259(2) A with z = 4 a nd s pa ce gro up P2,ab. Th e ca lc ula…
Several environmental parameters influence the ability of Stauroneis anceps Ehr. to survive periods of dehydration to equilibrium with atmospheric humidity. Cells grown in soil-water are better able to survive desiccation than cells grown in defined medium and cells from older cultures survive better than those from y…
Abstract Various methods suggested for the determination of carboxyl groups in chemically modified celluloses suffer from some drawbacks. Attempts have been made to overcome the drawbacks of some of these methods. The influence of alkali‐sensitive reducing groups, enediol groups, and lactones on the carboxyl estimatio…
Abstract One objective of a new crosslinking system for NR is a vulcanizate possessing good strength and fatigue properties and a high resistance to reversion; a second is a vulcanizate with reversibly thermolabile crosslinks. The reaction of amine-chloroboranes with NR was expected to give carbon-boron-carbon crossli…
X-ray and neutron diffraction measurements have shown that Mn2Au is a compound with a tetragonal unit-cell of dimensions a = 3.328 and c = 8.539 Å and that it can be assigned to the same space group as MnAu2, namely I4/mmm (D4h17). The neutron diffraction pattern of 74.2 at.% MnAu can be explained only if the ordered…
Abstract By the oxidation of tetraphenylpyrrole, two types of dimers of tetraphenylpyrryl were obtained. One dimer showed piezochromism and thermochromism, while the other showed photochromism and thermochromism. These phenomena were found to correspond to those of the piezochromic and photochromic dimers of triphenyl…
Jørgensen (1944) showed that young specimens of the siliceous freshwater sponge Spongilla lacustris L. obtained their skeletal silica from the water and demonstrated that, under experimental conditions, a relationship existed between the size of the microscleric spicules produced and the concentration of dissolved sil…
The metallic and non-metallic behaviour of certain transition metal oxides is discussed, taking into account the effects of crystalline structure and of polaron formation as well as those of correlation. It is shown that the former have an important role in explaining recent experimental results.
The RSM can be used to detect magnetic moment (vM≥5×10−6 emu), rotational hysteresis (vWR/H≥10−2 emu), spin flop (vM≥5×10−5 emu), and properties related to anisotropy energy [vK/H, v(χ⊥−χ∥)H and vMx≥5×10−6 emu], i.e., anisotropy constants, anisotropic susceptibility, and anisotropic spontaneous magnetization. Samples…
Abstract While the results of our study leave many questions regarding vulcanization still open, it is concluded that: 1. Effective, practical vulcanization of polymers containing simple monoolefinic residues by sulfur/accelerator, sulfur donor/accelerator, p -quinone dioxime (or dinitroso benzene), and halogenated al…
The salamander limb regenerate develops from a mesenchymatous bud of cells called the blastema. This review briefly considers the local origin and major features of blastemal cells and then discusses their role in the histogenesis of the regenerate. The capacity of blastemal cells to form the various cell types of the…
By DTA and visual methods the phase diagrams of the ten binary systems formed by lithium, sodium, potassium, rubidium and cesium bromide with barium or strontium bromide have been drawn. Moreover, the fusion thermal effects regarding the eutectics and the congruent compounds singled out in the systems have been evalua…
The integrated intensities of the K alpha emission satellite groups alpha alpha 3 alpha 4 and alpha 5 alpha 6 have been measured in secondary excitation for Na + in NaF, NaCl and NaBr and of F - in LiF, NaF and KF. The results are generally in agreement with calculations based on the assumption that the satellites are…
The penetration of a small-amplitude high-frequency electromagnetic wave into a plasma slab is calculated making allowance for the thermal motion of electrons. For low collision rates the electromagnetic field distribution in the plasma is strongly dependent on the ratio of the wave period to the transit time of elect…