Materials Literature
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Compressibilities of pyrite and cattierite have been examined by the single-crystal X-ray diffraction method up to 42 kbar and 36 kbar, respectively. Both S–S and M–S (M: Fe, Co) bonds in both of the minerals are contracted linearly with pressure within the experimental pressure ranges. However, contraction of the S–S…
Abstract A single crystal YAG: Ce 3+ annular scintillator axially placed in a movable light guide forms the essential part of a new BSE detector. Comparison of properties of this detector with those of a semiconductor detector is made. The bandwidth, signal‐to‐noise ratio, capacitance effects, and relative efficiency…
Binuclear [Co2(RCO2)4L2] and trinuclear [Co3(RCO2)6L2] cobalt(II) carboxylate complexes have been prepared (R = unsaturated alkyl, L = sterically hindered amine). The roles of electronic and steric effects on the formation of oligonuclear cobalt(II) carboxylates are discussed. The temperature dependence of their antif…
Most ceramic materials are unsuited to conditions involving non-uniform temperature distributions because of their inherent brittleness. Ceramic cutting tools operate in conditions of rapid temperature variation and consequently thermal cracking is frequently observed. Under certain cutting conditions, these cracks ar…
In order to evaluate the effect of environmental parameters on atmospheric stress corrosion cracking (SCC) of SUS 304 and 316L stainless steels, SCC tests were carried out in laboratory air controlled temperature and relative humidity (RH) environment by using U-bend specimens with the deposition of 0.5N chloride solu…
Abstract A study of iodine‐complexed nylon 6 films by polarized resonance Raman spectra shows the presence of both I 3 − and I 5 − species, the latter most likely in the form of an I 2 / I 3 − complex. Polarization characteristics of the Raman spectra show that the I 2 / I 3 units are orinted along the polymer chain a…
The two-phase titration of miconazole, econazole and clotrimazole in vaginal tablets and suppositories, creams and lotions using indophenol blue as a hydrophobic indicator and sodium dodecyl sulphate as a titrant is proposed. The accuracy and precision of the method are good. The non-interfering substances that are pr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon-29 NMR structural characterization of two novel germanosilicate cages in a tetramethylammonium germanosilicate solutionC. T. G. Knight, R. James. Kirkpatrick, and Eric. OldfieldCite this: J. Am. Chem. Soc. 1986, 108, 1, 30–33Publication Date (Print):January 1, 1986Pu…
A novel procedure for the removal of carbonaceous deposits from zeolites using ozone-enriched oxygen is described. Pentasil zeolites (SiO2/Al2O3 mole ratios 35, 70) were studied and deactivated using methanol conversion to hydrocarbons and o-xylene isomerisation. Low temperature ozone reactivation was found to restore…
p-Benzoquinone derivatives fused with sulphur-containing heterocycles are strong electron acceptors and some of their charge transfer complexes with electron donors show high electrical conductivities.
A homologous series of α,ω-bis-[p-(4-alkoxyphenoxycarbony)Phenoxy] alkanes was prepared; their thermal and liquid crystalline properties were studied by differential scanning calorimetry and on the hotstage of a polarizing microscope. The nature of the liquid crystalline phase of the compounds depended greatly on the…
The ignition of metals and alloys have been investigated by rotating the end of a hollow cylinder against an identical stationery cylinder on a common axis (frictional heating) in gaseous oxygen. A ranking criterion that measures the resistance of metals and alloys to ignition is discussed. It consists of the power pe…
The possibilities for the use of fine structural methods in environmental toxicology are briefly summarized with special respect to fine structural consequences of toxic cellular injury and cell death.
Abstract In the system CuO – SeO 2 – H 2 O three new copper(II)-selenites were synthesized under hydrothermal conditions. The crystal structures were determined by single crystal X-ray techniques: Cu(SeO 3 )-II [ a = 5.962(1) Å, b = 7.010(1) Å, c = 12.240(1) Å, space group Pcab , Z = 8, R w = 0.020], Cu(SeO 3 )-III […
Solution properties of three manganese porphyrins, in monomeric form, were investigated. These were the 'picket-fence-like' porphyrin Mn(III)-alpha,alpha,alpha,beta- tetra-ortho(N-methylisonicotinamidophenyl)porphyrin (Mn(III)PFP) and two 'planar unhindered' porphyrins, the Mn(III)TMPyP (tetrakis (4-N-methylpyridyl)po…
Abstract not Available.
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Abstract Five vinylcatechol precursors have been synthesized by either alcohol dehydration or Wittig coupling techniques. Dehydration of the appropriate sec ‐phenethyl alcohol is the most efficient synthetic approach: the following monomers (yields) are reported: 5‐vinyl‐1,3‐benzodioxole, I (63%); 3,4‐dimethoxystyrene…
Accurate, O(5%) measurements of total-atom differential coherent-scattering cross sections of Sn and Pb within the range of scattering angles 10?(de60\ifmmode^\circ\else\textdegree\fi{} have been performed using 279.2and Comparison, with the predictions of Kissel, Pratt, and Roy and the various form-factor formulation…
In order to understand the hydrogen permeation phenomena in multiple metal layers, the time dependent permeation rates for duplex membranes of Cu–Ni and Cu–Fe have been systematically measured under hydrogen pressures from 103 to 105 Pa at temperatures from 500 to 1000 K, and the obtained results are compared with the…