Materials Literature
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The effect of soft additives (Pb, Bi) on the machinability of low carbon resulphurised free machining steels has been investigated using the plunge machinability test. The cutting and thrust forces and chip thickness were measured as a function of cutting speed in the steels having various contents of Pb and Bi. Unexp…
The relationship between Si in soil solution and allophane and halloysite content was studied by using a drainage sequence of three New Zealand soils from rhyolitic volcanic alluvium. Clay mineralogy was compared with soil colour and drainage. Allophane and halloysite contents of two morphologically similar soils from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of the packing structure of mesogenic groups on the flexible spacer length of liquid-crystalline side-chain polymersTakanari Yamaguchi, Tadahiro Asada, Hisao Hayashi, and Naotake NakamuraCite this: Macromolecules 1989, 22, 3, 1141–1144Publication Date (Print):Marc…
Fouling of heat transfer equipment poses a major problem in the food and especially the dairy industry. A review of recent progress made in the study and understanding of fouling and cleaning mechanisms in relation to exchangers and heat exchange surfaces in contact with milk components is given. The first part descri…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectroscopy of iron(II) superstructured porphyrins: influence of porphyrin distortions on carbonyl and dioxygen ligand dissociationAlain Desbois, Michel Momenteau, and Marc LutzCite this: Inorg. Chem. 1989, 28, 5, 825–834Publication Date (Print):March 1, 198…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray diffraction and Raman studies of zinc(II) chloride hydrate melts, ZnCl2.rH2O (r = 1.8, 2.5, 3.0, 4.0, and 6.2)Toshio Yamaguchi, Shunichi Hayashi, and Hitoshi OhtakiCite this: J. Phys. Chem. 1989, 93, 6, 2620–2625Publication Date (Print):March 1, 1989Publication History…
Chemically stabilized β‐cristobalite has been synthesized in the Na 2 O‐Al 2 O 3 ‐SiO 2 and CaO‐Al 2 O 3 ‐SiO 2 systems. Highly reactive chemical precursors in the gel and zeolitic state are thermally transformed to stabilized β‐cristobalite crystalline solutions in each system. High‐temperature X‐ray diffraction, pha…
The thermodynamics of the enzymatic hydrolysis of cellobiose, gentiobiose, isomaltose, and maltose have been studied using both high pressure liquid chromatography and microcalorimetry. The hydrolysis reactions were carried out in aqueous sodium acetate buffer at a pH of 5.65 and over the temperature range of 286 to 3…
Models incorporating different levels of sophistication are presented for predicting the surge distribution in motor stator windings. Results predicted by these models have been validated against experimental results. Simple models, which provide insight into the relevant mechanisms, are presented for estimating the i…
Abstract The distribution of Fe 3+ -kaolinite, Al-goethite and Al-hematite and their contents of Fe and Al in bauxites and ferricretes are controlled by water activity, dissolved silica activity, temperature and particle size. The proposed model, based on ideal solid-solution equilibria in the Fe 2 O 3 -Al 2 O 3 -SiO…
Factors concerning the stabilization of the tetragonal and cubic phases, metastable at room temperature, with respect to the monoclinic stable phase in ultrafine zirconia powders are studied. The importance of Na + ions in the initial zirconia amorphous gel in obtaining a cubic phase has been confirmed. By an X‐ray di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxide ion conductivity in Ln5Mo3O16+x) (Ln = La, Pr, Nd, Sm, Gd; x .apprx. 0.5) with a fluorite-related structureM. Tsai, Martha Greenblatt, and W. H. McCarrollCite this: Chem. Mater. 1989, 1, 2, 253–259Publication Date (Print):March 1, 1989Publication History Published onli…
Abstract Differential Scanning Calorimetry (DSC) is a popular method for the characterization of the cure kinetics of thermosetting materials. The experiments may be carried out under isothermal or temperature program modes. Several authors have pointed out the fact that the kinetic rate expressions for non‐isothermal…
Abstract A simple model of filler dispersion has been used to approximate particle spacing and the portion of rubber that is restricted as a result of particulate reinforcement. For N330 black, which has an equivalent radius of 20.2 nm, the critical concentration (in SBR of M w =344 000 ) for coherent carbon-gel forma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange interactions in semiquinone complexes of iron. Structural and magnetic properties of tris(3,5-di-tert-butylsemiquinonato)iron(III) and tetrakis(3,5-di-tert-butylsemiquinonato)tetrakis(3,5-di-tert-butylcatecholato)tetrairon(III)Steven R. Boone, Gordon H. Pur…
Magnetic and magnetoelectric measurements were made on a single crystal of ferroelectric PbFe0.5Nb0.5O3. It was revealed that PbFe0.5Nb0.5O3 has a weak ferromagnetic moment and linear magnetoelectric effect below a transition point T m c of approximately 9 K. The magnetic class below and above T m c was determined to…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and proton NMR studies of the electronic and magnetic properties of low-spin ferric isocyanide tetraphenylporphyrin complexesG. Simonneaux, F. Hindre, and M. Le PlouzennecCite this: Inorg. Chem. 1989, 28, 5, 823–825Publication Date (Print):March 1, 1989Publication…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemical rearrangements of stable silenesKim M. Baines, A. G. Brook, R. R. Ford, P. D. Lickiss, A. K. Saxena, W. J. Chatterton, J. F. Sawyer, and B. A. BehnamCite this: Organometallics 1989, 8, 3, 693–709Publication Date (Print):March 1, 1989Publication History Publishe…
ABSTRACT We studied the hypothesis that diatom immigration abilities are related to their fitness for colonizing stream substrates. Diatom abundances on artificial substrates exposed for 24 h (the measure of immigration rate) and abundances of stream plankton were determined in six habitats. Diatom immigration varied…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the 2:1 charge-transfer salt of decamethylferrocene and perfluoro-7,7,8,8-tetracyano-p-quinodimethane: [[Fe(C5Me5)2]+.cntdot.]2[TCNQF4]2-. The electronic structure of [TCNQF4]n (n = 0, 1-, 2-)David A. Dixon, Joseph C. Calabrese, and Joel S.…