Materials Literature
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Mixtures of SF6 (100 kPa≤PSF6≤400 kPa) and water (concentrations ranging from 240 to 2000 vpm) have been submitted to point-plane 50-Hz ac corona discharges. The only stable gaseous by-products detected, either by gas-phase chromatography or gas chromatography–mass spectrometry techniques, were SOF2 and SO2F2. The var…
Abstract It is well known that during the sulfur curing of unsaturated rubbers, two competing reactions occur: (a) crosslinking or vulcanization, and (b) reversion or devulcanization. In the case of butyl rubber, these two competing reactions have been summarized in earlier reports. Tire curing bag (bladder) compounds…
Monodispersed ZrO 2 seed particles which were prepared by hydrolysis of zirconium alkoxide solutions were allowed to grow by further addition of zirconium alkoxide and water under conditions in which new particles do not nucleate and grow. The particle growth mechanism is presumed to be a surface reaction in which the…
Abstract An apparatus has been constructed that permits the measurement of time‐dependent changes in pressure near the point of vitrification. The same instrument is used for measuring steady‐state PVT properties, which are necessary for a proper analysis of the dynamic measurements. The former experiments are referre…
Abstract The organometallic oxide clusters [(MCp*)4V6O19] (M = Rh, Ir; Cp* = C5Me5) were prepared and characterized by elemental analyses, SIMS as well as IR and NMR (1H, 13C, 17O, 51V) spectroscopy. Single crystal X-ray analysis showed that [(RhCp*)4V6O19]·4CH3CN·H2O contains the vanadate hexamer core (V6O19). The rh…
An efficient and reliable method for characterizing the nature of stacking fault tetrahedra in f.c.c. metals using electron microscope diffraction image contrasts is presented. By using the 220 reflection, and thereby eliminating the contrast from overlapping stacking faults, one can differentiate between intrinsic-ty…
Abstract When chemical additives were found that could minimize the loss of chemical and physical properties of a thermally‐processable but heat‐sensitive polymer called poly(vinyl chloride) (PVC), an industry was born. And with it grew the world of plastics additives. Stabilizers for PVC became and industry itself, f…
The normal voltage failures in multilayer ceramic capacitors (MLC) using the temperature-humidity-bias test (THB) are described. The cumulative failure data showed that the MLC failures occurred in several stages during the THB test, with the extent of failures depending on the quality of the capacitor lot and the bia…
The essential oil of Bupleurum fruticosum was investigated qualitatively and quantitatively together with the anti-inflammatory activity of the whole essential oil and its major components. In addition, antispasmodic activity was determined in rat uterus preparations using acetylcholine and oxytocin as agonists. The a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of nematic interaction in the orientational relaxation of polymer meltsMasao Doi, Dale Pearson, Julie Kornfield, and Gerry FullerCite this: Macromolecules 1989, 22, 3, 1488–1490Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics and mechanisms of thermal imidization of a polyamic acid studied by ultraviolet-visible spectroscopyEumi Pyun, Richard J. Mathisen, and Chong Sook Paik SungCite this: Macromolecules 1989, 22, 3, 1174–1183Publication Date (Print):March 1, 1989Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental characterization of the elution profiles of high concentration chromatographic bands using the analytical solution of the ideal modelSadroddin. Golshan-Shirazi and Georges. GuiochonCite this: Anal. Chem. 1989, 61, 5, 462–467Publication Date (Print):March 1, 1989…
Thirty-five human neoplasms from various sites and of various histologic types and stages were examined with phosphorus-31 magnetic resonance spectroscopy in situ. The tumors included 13 squamous cell carcinomas of the head and neck (lymph nodes), eight Hodgkin lymphomas, six non-Hodgkin lymphomas, four carcinomas of…
The discussion centers on the formulation of a constitutive model for brittle solids satisfying two conflicting requirements: simplicity and accuracy. Owing to the inherent complexity oif the problem, stemming from the random distribution of interacting defects, analytical expressions relating macrofields are possible…
Some Thalassiosira species with undulated valves have been examined in light and electron microscopes, partly by using type material. Two groups of taxa are distinguished based on the internal valve structure. Thalassiosira lacustris, T. australiensis and T. gessneri from fresh or brackish water have radial zig-zag pa…
The strength distribution of fibers within a two‐dimensional laminate ceramic/ceramic composite consisting of an eight harness satin weave of Nicalon continuous fibers within a chemically vapor infiltrated SiC matrix was determined from analysis of the fracture mirrors of the fibers. Comparison of the fiber strengths…
Abstract The plasma polymerization of allylamine in an inductively coupled rf plasma reactor is analyzed by Fourier transform infrared spectroscopy. Comparison of the infrared spectra of the as‐received monomer and the plasma polymerized film reveals a conversion of the primary amine in the monomer (CH 2 NH 2 ) to a…
Abstract The α‐relaxation process of seven commercial diglycidyl ether of bisphenol‐A (DGEBA) epoxy resins of varying molecular weights, without hardener, was characterized by measuring the frequency and temperature dependence of the complex permittivity, (ϵast;). The temperature dependences of the frequency of maximu…
Abstract Calcareous Vertisols and associated Inceptisols are abundant around the River Guadalquivir Valley, southern Spain. They support a profitable rainfed agriculture; little is known, however, about their phosphate status and fertility. For this reason the phosphate fractions in the Ap horizons of 24 of such soils…
We present a Landau theory for transitions among tilted hexatic phases in liquid-crystal films. Using the renormalization group, we then derive phase diagrams with four tilted hexatic phases: the hexatic-I and hexatic-F phases, an intermediate hexatic-L phase, and an unlocked phase. If the films are crystalline rather…