Materials Literature
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Abstract The mineralogy of the clay fraction was studied for soils and saprolite on two Blue Ridge Front mountain slopes. The clay fraction contained the weathering products of primary minerals in the mica gneiss and schist parent rocks. Gibbsite is most abundant in the saprolite and residual soil horizons, where only…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEquilibrium dissolution temperature of low molecular weight polyethylene fractions in dilute solutionAbaneshwar Prasad and Leo MandelkernCite this: Macromolecules 1989, 22, 2, 914–920Publication Date (Print):February 1, 1989Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of close boiling point mixtures (p-cresol/m-cresol, guaiacol/alkylphenols, 3-picoline/4-picoline, substituted anilines) through dissociation extractive crystallizationVilas G. Gaikar, Alpana Mahapatra, and Man Mohan SharmaCite this: Ind. Eng. Chem. Res. 1989, 28,…
The aspartylprotease of the human immunodeficiency virus HIV-1 (NY5) has been crystallized in a form suitable for x-ray diffraction analysis. The crystals are tetragonal bipyramids and produce an x-ray diffraction pattern that exhibits the symmetry associated with space group P4(1)2(1)2 (or its enantiomorph, P4(3)2(1)…
Characteristic features of compositional ordering processes in ferroelectric (FE) and antiferroelectric (AFE) compounds, the effect of compositional ordering upon the Curie point, FE phase transition diffusion and other properties are considered. The effect offers ample scope for studies into the nature of FE transiti…
The overall performance of a Compton spectrometer and, in particular, its energy resolution are investigated both experimentally and theoretically for different scattering materials. Using low-Z (less than or equal to 8) scatterers of moderate sizes (scatterer diameter d less than or equal to 5 mm), there are negligib…
The amount and profile of the charge distribution in a polymethyl methacrylate plate of 7.9-mm thickness were measured after electron beam irradiation. When the plate was irradiated by a beam whose energy was 1 MeV and the total dose was 3 kGy, a spatial charged layer was produced at approximately 2.5 mm from the irra…
Spectropolarimetric observations of the BN object at 10 and 20 μm reveal a surprisingly large ratio of 20 to 10 μm polarization in the respective peaks. The results are compared with the predictions of core/mantle grain models based on graphite and ice mixtures with a variety of silicates. Except for a glassy bronzite…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLight-scattering characterization of poly(tetrafluoroethylene). 2. PTFE in perfluorotetracosane: molecular weight distribution and solution propertiesBenjamin Chu, Chi Wu, and Warren BuckCite this: Macromolecules 1989, 22, 2, 831–837Publication Date (Print):February 1, 1989P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of surface structure of built-up film of fluorocarbon amphiphile and polymer/(fluorocarbon amphiphile) composite thin film by means of x-ray photoelectron spectroscopyAtsushi Takahara, Naoaki Morotomi, Shoji Hiraoka, Nobuyuki Higashi, Toyoki Kunitake, and Tisato Kaj…
We have performed an exact real-space renormalization-group calculation of the complete wave-vector- and frequency-dependent-response function, S(q,\ensuremath{\omega}), for the one-dimensional Fibonacci-chain quasicrystal with ``Goldstone'' dynamics as in the case of phonons or magnons. We present surface plots, whic…
We report experimental studies of the onset of hard-mode Raman activity in some AB′ x B″1−x O3-type compounds related closely to the perovskites. The first order Ramanscattering seems to appear due to a phase transition at high temperatures into Fm3m space group from the Pm3m paraphase. We believe that the existence o…
A one‐dimensional mathematical model for the lithium/thionyl chloride primary cell has been developed to investigate methods of improving its performance and safety. The model includes many of the components of a typical lithium/thionyl chloride cell such as the porous lithium chloride film which forms on the lithium…
In Landau--de Gennes theory, the free energy f of liquid crystals is expanded into powers of a symmetric, traceless tensor order parameter ${Q}_{\ensuremath{\alpha}\ensuremath{\beta}}$ and its derivatives ${Q}_{\ensuremath{\alpha}\ensuremath{\beta}}$,\ensuremath{\gamma}. The expansion is subject to the condition that…
Amine aus Amiden, Nitrilen und Nitroalkenen, Alkohole aus Carbonsäuren und Sulfide aus Sulfoxiden werden in guten Ausbeuten mit dem Reduktionsmittel LiBH 4 /Me 3 SiCl erhalten. Auch α‐Aminosäuren lassen sich leicht und unter Erhalt der optischen Reinheit zu Aminoalkoholen reduzieren. 1, 3 und 5 sind Beispiele für Eduk…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHalf-open metallocenes of iron, ruthenium, and osmium: synthesis, characterization, photoelectron spectroscopy, and theoretical calculationsRolf. Gleiter, Isabella. Hyla-Kryspin, Manfred L. Ziegler, Gertrud. Sergeson, Jennifer C. Green, Lothar. Stahl, and Richard D. ErnstCit…
Expressions for the electron energy-loss probability are obtained for electrons travelling parallel to, firstly, one and, secondly, two coaxial cylindrical interfaces between different media. These expressions have been evaluated for Al-vacuum interfaces confirming that the cylindrical modes behave in the manner expec…
Abstract A deforming FEM (DFEM) analysis of one‐dimensional inverse Stefan problems is presented. Specifically, the problem of calculating the position and velocity of the moving interface from the temperature measurements of two or more sensors located inside the solid phase is addressed. Since the interface velocity…
In this investigation, critical manipulation, observation, and analysis of polarization curves as a function of nitrogen content in cast duplex CF-type stainless steels (SSs) has been performed. These, in conjunction with microstructural observations and atomic absorption spectroscopic analyses of polarization cell so…
The determination of alpha-amylase activity using an ethylidene-blocked 4-nitrophenyl-maltoheptaoside (EPS) has been evaluated in five laboratories on eight different analysers at 25 degrees C, 30 degrees C and 37 degrees C. The protecting ethylidene group inhibits hydrolysis at the non-reducing end of the substrate m…