Materials Literature
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The organic content of mineralized tissues has been found to decrease with increasing tissue density, from about 60% of the mineral weight in light bone like deer antler to 1 to 2% in hyperdense bone like porpoise petrosal. The ratio of the weight of mineral that can fill the collagen hole zones to the total mineral c…
For microwave and millimeter-wave applications, there is increasing interest in using films rather than bulk ferrites. In some cases, such as magnetostatic wave devices, films provide definite performance advantages. In other cases, films may provide lower cost, smaller size, and enhanced compatibility with planar cir…
New host molecules with a central 1,3,5-trisubstituted benzene ring and rigidly attached lateral arms composed of aryl or arylethynyl and extra functional groups are reported. They are shown to give more than thirty clathrates with a wide variety of organic solvents comprising alicyclic, aromatic, heterocyclic, dipola…
A hexagonal packing of rod like structures is proposed in solutions and gels of a perfluorinated ionomer. The diameter of the rods has been obtained by two different approaches either geometrical from shifts of the interference peak versus concentrations in small angle scattering experiments or direct from analysis of…
Radical polymerization of fumaric acid derivatives, such as dialkyl fumarates, gave polymers consisting of a less-or nonflexible substituted polymethylene structure. The yield and molecular weight of the polymers produced increased as the bulkiness of the ester substituents increased. For example, when di-t-butyl fuma…
This review article, based on a lecture delivered in Madras in 1985, is an account of the author's experience in the working out of the molecular structure and conformation of the collagen triple‐helix over the years 1952–78. It starts with the first proposal of the correct triple‐helix in 1954, but with three residue…
Experimental infections of pigs with Strongyloides ransomi, Stephanurus dentatus, Ascaris suum, Oesophagostomum spp. or Trichuris suis at increasing levels generally decrease daily gain and increase feed to gain ratio linearly. At lower, subclinical levels of infection, the feed to gain ratio typically is increased 3%…
A per-phase equivalent circuit of a linear induction motor (LIM) with sheet secondary is developed with parameters derived from field analysis, taking the specific phenomena of longitudinal-end effect, transverse-edge effect, field diffusion in the secondary, and back-iron saturation into account. The results are appl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic and structural properties of acetato(dien)copper(1+) perchlorate: a .mu.-acetato-bridged quasi-one-dimensional complexDebra K. Towle, S. K. Hoffmann, William E. Hatfield, Phirtu Singh, and Phalguni ChaudhuriCite this: Inorg. Chem. 1988, 27, 2, 394–399Publication Dat…
UTokyo Repositoryは本学で生産されたさまざまな学術成果を電子的形態で集中的に蓄積・保存し、世界に発信することを目的としたインターネット上の発信拠点です。 The UTokyo Repository is the system to store and provide digital resources created by members of the University of Tokyo. Its main purpose is to develop digital collections, make them available online, and preserve them for long-term…
The IR spectra of representative miscible aromatic polybenzimidazole/aromatic polyimide (PBI/PI) blends have been studied. Composition-dependent frequency shifts of up to 55 cm-1 in the N-H stretching band of PBI and up to 6 cm-1 in the carbonyl stretching bands of Pl were observed. These shifts were removed by therma…
Abstract Fibrous fractions were prepared from sugar beet pulp (RF) by sequential extractions with potassium oxalate, 0.05 M hydrochloric acid at 85°C and 0.05 m sodium hydroxide at 4°C. The overall composition, polysaccharide structure and some physico‐chemical properties (cation exchange capacity, CEC; water holding…
This reference book explains the scientific principles of heterogeneous catalysis while also providing details on the methods used to develop commercially viable catalyst products. A section of the book presents reactor design engineering theory and practices for the profitable application of these catalysts in large-…
The crystals of (CH3NH3)3Bi2Br9 have been grown which at room temperature are isomorphous with Cs3Bi2Br9 and (CH3NH3)3Sb2Br9. The space group is P3m1, a = 0.807, c = 1.008 nm, V = 0.5685 nm3, Z = 1. The crystals reveal, when cooling, three phase transitions at 188 ± 0.5, 140 ± 1, and 101.5 ± 0.5 K. The high temperatur…
The structure and mechanical properties of wool fibers and assemblies of wool fibers are explored. A progressive study of mechanics from the simple assemblies of fibers, as in wool staples and fiber bundles, through complex clothing structures made from fibers and fabrics shaped in three dimensions is developed. The i…
Plastic flow of polycrystalline solids at elevated temperatures occurs by one of three independent deformation mechanisms: slip by dislocation movement, sliding of adjacent grains along grain boundaries, and directional diffusional flow. All three mechenisms are considered to be thermally activated and controlled by t…
Introduction and General Survey. Measurement of Thermal Conductivity. Electrons and Holes in Semiconductors. Electronic Thermal Conductivity. Phonons and Phonon Scattering Processes. Lattice Thermal Conductivity. Semiconducting Materials--Analysis of Experimental Data I. Semiconducting Materials--Analysis of Experimen…
An algorithm for the protection of power transformers is described in which transformers are represented by a universal equivalent circuit composed of inverse inductance, without reference to an internal fault. The circuit is derived from multiterminal network analysis of the windings. The intrinsic characteristics of…
Abstract N,N′-Dialkyl-1,4-benzenedicarboxamides melt with anomalously small enthalpy changes. The 1,3-analogs behave similarly but at lower temperatures. These observations provide a clue to design novel mesomorphic compounds; N,N′,N″-trialkyl-1,3,5-benzenetricarboxamides. The compounds carrying pentyl to octadecyl gr…
Abstract Viscosity‐average relative molecular masses have been determined for a series of chitosans having the same relative molecular mass and relative molecular mass distribution but differing extents of N‐acetylation. The results obtained show that the same viscometric constants in the Mark‐Houwink equation [η] = K…