Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Chitin is a relatively intractable polymer and despite its structural similarity to cellulose it is insoluble in typical cellulose solvents such as cuprammonium hydroxide (Schweizer's reagent), cupriethylene diamine and Cadoxen. However there are a limited number of solvent systems which may be grouped together in thr…
The authors present a model for the development of crystallographic texture by hot deformation in NdFeB magnets produced by rapid solidification. Favourably oriented grains, with their c-axis parallel to the compression axis, grow by mass transport through a Nd-rich liquid grain boundary phase, forming large platelet…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of triethylsiloxy-substituted alumoxanes: their structural relationship to the minerals boehmite and diasporeAllen W. Apblett, Alison C. Warren, and Andrew R. BarronCite this: Chem. Mater. 1992, 4, 1, 167–182Publication Date (Print):January 1,…
Grain defect formation during solidification of <OOl> nickel base single crystals has been studied in a series of alloys over a wide range of imposed thermal gradients and growth rates. Solute-driven convective instabilities, associated with high levels of Re and W and/or low levels of Ta, promote the formation of "fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel thermoset polyimidazole amidesYing Hung SoCite this: Macromolecules 1992, 25, 2, 516–520Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00028a003https://doi.org/10.…
High coordinate (five- and sixfold) Si and Al species have been previously observed by MAS NMR techniques in binary silicate and peraluminous aluminosilicate glasses and gels. For liquids along the charge-balanced joins SiO2-MAlO2 or SiO2-M′Al2O4 (M = alkali metal; M′ = alkaline earth), such high coordinate species ha…
This review attempts to bring together published data, their analysis, and models related to water adsorption and surface conductivity in humid environment of unirradiated and gamma -irradiated practical insulating solid polymers. It also includes similar information on the decay of charges deposited by corona on thei…
The transition mechanism for spark to pseudoglow and glow discharge is examined and the attending question of discharge detectability in an electrical apparatus is considered. The effect of gap spacing or cavity diameter and overvoltage is discussed in terms of experimental observations and theoretical calculations us…
The inconsistencies in contact angle data presented in the literature can be attributed to a number of factors. The awareness of these factors would allow novice researchers to make meaningful contact angle measurements and interpretations. In this survey the effects of surface roughness and heterogeneity, surface pre…
Four mineral apatites (three samples of Totenkopf-hydroxyapatite, one sample of Durango-fluorapatite) and a synthetic fluorapatite were analysed as a function of temperature by X-ray and neutron single crystal diffraction mainly to quantify the disorder contribution to the atomic Debye Waller factor (DWF). The anisotr…
NADP-dependent isocitrate dehydrogenase activity has been screened in several cyanobacteria grown on different nitrogen sources; in all the strains tested isocitrate dehydrogenase activity levels were similar in cells grown either on ammonium or nitrate. The enzyme from the unicellular cyanobacterium Synechocystis sp.…
Work roll life of hot rolling mills is strongly affected by roll material. Recently, high-carbon high speed steel rolls have been developed to improve further work roll life.In this paper, relationship between basic characteristics of roll and microstructure in high-carbon high speed steels were investigated. After sp…
A γ-ray absorption technique has been used to measure the evolution of volume fraction profiles during transient settling of flocculated alumina suspensions. The experimental system consisted of a submicron, polydisperse alumina powder immersed in an organic solvent (decalin) with fatty acids of varying molecular weig…
Microstructure and Transformations in Steel (G. Krauss). Structure-Property Relationships in Steels (F. Pickering). Steelmaking and Non-Metallic Inclusions (A. Nicholson & D. Thornton). Processing - Conventional Heat Treatments (H. Ohtani). Processing - Thermomechanical Controlled Processing (I. Kozasu). Processing -…
Magnesium single crystals were stretched in [1120] direction to investigate the deformation behavior by {1122} <1123> slip (SPCS). In a range from 77K to 133K, the yield stress decreases with increasing temperature, while the stress increases with increasing temperature in a range from 133K to 293K. The stress increas…
Selected commercial and experimental composites and resin systems have been evaluated by thermal analysis techniques of Differential Scanning Calorimetry, Thermogravimetric Analysis and Thermomechanical Analysis. Important thermal data such as heat of cure, coefficient of thermal expansion, dimensional changes over se…
Magic angle spinning nuclear magnetic resonance spectroscopy was used to determine the local evironments of silicon and aluminium atoms in yttrium aluminosilicate glasses. The 29 Si and 27 Al spectra indicate that these glasses are quite complex and possess a lower degree of short range order than alkali and alkaline…
A series of free-base octaalkylporphyrins having halogen substituents at different sites on the nucleus has been examined by photophysical methods. In general, halogenation decreases the fluorescence yield and lifetime, increases triplet formation and decreases the resultant triplet lifetime. The magnitude of these ef…
The basic characteristics of the stress-strain-temperature relationship were investigated experimentally as part of the research on the mechanical properties of shape memory polymer of polyurethane series. The main results are summarized as follows.(1) The deformation resistance of the material increase with the numbe…
Extracellular matrix molecules, such as collagens, are good targets for oxygen free radicals. Collagen is the only protein susceptible to fragmentation by superoxide anion as demonstrated by the liberation of small 4-hydroxyproline-containing-peptides. It seems likely that hydroxyl radicals in the presence of oxygen c…