Quasicrystals: A New Kind of Ordered Solids
The various approaches proposed so far to describe the atomic structure of quasicrystals are discussed together with some of the descriptions of the newly observed defects in these structures.
Materials Literature
文献浏览
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。
Some characteristics of mineralised collagen
According to Albert Szent-Gyorgyi, ‘Discovery consists of looking at the same thing as everyone else and thinking something different.’ The ideas and suggestions presented in this chapter do not quite satisfy Szent-Gyorgyi’s paradigm, since some new facts were added to the older data. However, the previously available…
Overview of the pulp and paper industry from a chemical industry perspective
Abstract The major processes of the pulp and paper industry are overviewed with particular emphasis given to existing chemical requirements; processing trends are identified which may affect future chemical requirements. The pulp and paper industry represents a vast market for chemicals. On the papermaking side, overa…
The Properties and Uses of Specific Hollow-spindle Yarns
A study is reported in which fancy yarns were made by the wrap-spinning process with a range of machine conditions and fibre supplies. The initial exploration identified the important control parameters and showed up characteristic yarn features. A particular bouclé-derivative yarn was especially interesting and was t…
Appendix: conduction in polar crystals. I. Electrolytic conduction in solid salts
N. F. Mott and M. J. Littleton, J. Chem. Soc., Faraday Trans. 2, 1989, 85, 565 DOI: 10.1039/F29898500565
Tungsten-carbon, carbon-carbon and carbon-hydrogen bond activations in the chemistry of W2R2(OR')4(W.tplbond.W) complexes. 3. Competitive .alpha.-hydrogen versus .beta.-hydrogen eliminations and ethylene-to-acetylene hydrogen transfers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTungsten-carbon, carbon-carbon and carbon-hydrogen bond activations in the chemistry of W2R2(OR')4(W.tplbond.W) complexes. 3. Competitive .alpha.-hydrogen versus .beta.-hydrogen eliminations and ethylene-to-acetylene hydrogen transfersMalcolm H. Chisholm, Bryan W. Eichhorn,…
Isocyanate blocking agents use in polyurethane processing
Abstract Difunctional isocyanates blocked with ϵ‐caprolactam and oximes are tested as curing agents in poly‐(urethane‐ureas) prepregs formulations. With ϵ‐caprolactam blocking agent the temperature of dissociation is around 20–40°C higher than with 2‐butanone oxime. Polymerizable blocking agents are proposed for the d…
A vibrational study of tautomerism and associations of 2-mercaptoimidazole and 2-mercaptothiazole
Infrared and Raman spectra of 2-mercaptoimidazole and 2-mercaptothiazole in solid state as well as i.r. spectra of 2-mercaptothiazole in HCCl 3 and CS 2 0.05M solutions have been investigated. A general assignment of all the observed bands is proposed for both fundamental vibrations and for overtone and combination ba…
Detailed analysis of uranium silicide dispersion fuel swelling
Swelling of U{sub 3}Si and U{sub 3}Si{sub 2} is analyzed. The growth of fission gas bubbles appears to be affected by fission rate, fuel loading, and microstructural change taking place in the fuel compounds during irradiation. Several mechanisms are explored to explain the observations. The present work is aimed at a…
Influence of Magnetic Field on the Dissolution of Copper, Zinc and Brass in Flowing Nitric Acid Solution
To utilize the inhibition effect of magnetic field on metal dissolution, it was required to be examined in the flowing conditions of solutions. A 100cm3 of 0.015mol dm-3 nitric acid solution for zinc and of 1.5mol dm-3 nitric acid solution for copper and brass were used respectively. The flowing rate of solutions were…
A Computer Program for Semiquantitative Mineral Analysis by X-Ray Powder Diffraction
Abstract A computer program for semiquantitative mineral analysis used by the U.S. Geological Survey was designed in 1972 by J. C. Hathaway and translated into Fortran language for the IBM-360–65 computer by R. W. Bowen, both of the Geological Survey. Since then, the program has been upgraded and adapted for other com…
Gold plating on aluminium alloys for space applications
SummaryThe inherent lightness and good strength to weight ratio of aluminium is important in aerospace fields. Gold plating is required where a stable coating should have good electrical conductivity and/or low infrared emissivity. Aluminium and its alloys require special surface preparation for successful electrodepo…
Structural studies on 6–66 and 6–68 copolyamides
Abstract The effect of irregularity of chemical structure on melting points, densities and crystal structures was studied for 6–66 and 6–68 copolyamides. All copolyamides showed V‐shaped melting point vs. composition curves. The densities, corrected for the difference in molecular weights between comonomers, also show…
Stability of organic thin films on inorganic substrates : prototype studies using metal phthalocyanines
Thin films of metal phthalocyanines (PbPc and RuPc) on inorganic substrates (Ag, Pt, Cu, Au, Al203 and Agl) In the submonolayer and monolayer range were investigated. Their chemical compositions and electronic and dynamic structures were characterized by means of photoemission and vibrational spectroscopy, with partic…
Stability relationships between solid cesium aluminosilicates in aqueous solutions at 200 °C
Interconversion reactions among the solids SiO 2 (quartz and fused), γ-AlOOH (boehmite), CsAlSiO 4 , CsAlSi 2 O 6 (pollucite), and CsAlSi 5 O 12 , in contact with aqueous solutions at 200 °C, have been investigated. Results support earlier suggestions that CsAlSi 5 O 12 is not stable with respect to CsAlSi 2 O 6 + SiO…
Microstructural Effects on Fracture Toughness of Polycrystalline Ceramics in Combined Mode I and Mode II Loading
Fracture toughness of polycrystalline alumina and ceria partially stabilized tetragonal zirconia (CeO2-TZP) ceramics were assessed in combined mode I and mode II loading using precracked disk specimens in diametral compression. Stress states ranging from pure mode I, combined mode I and mode II, and pure mode II were…
Raman and infrared spectroscopy of the AlCl3–SOCl2 system
The structural aspects of the AlCl3–SOCl2 system have been examined by vibrational spectroscopy. The SOCl2 molecule exhibits amphoteric character, i.e. it can act simultaneously as a donor through the oxygen atom and as an acceptor through the sulphur atom. The liquid state contains loosely bound, open-chain dimers/ol…
Relationship between lens properties and director orientation in a liquid crystal lens
Lenses with a homogeneously aligned liquid crystal having a Fresnel structure have been prepared by using a nematic with a positive dielectric anisotropy. Their focal length can be varied continuously from the value fe for an extraordinary ray to f o for an ordinary ray by applying an electric field across the lens ce…
Water Chemistry Experience of Nuclear Power Plants in Japan
Japanese LWRs have experienced several troubles caused by corrosions of structural materials in the past ca. 20 years of their operational history, among which are increase in the occupational radiation exposures, intergranular stress corrosion cracking (IGSCC) of stainless steel piping in BWR, and steam generator cor…
Correlation between occupancy and temperature factors of solvent molecules in crystal structures of proteins
Correlation between occupancy and temperature factors during the refinement of a disordered molecule is discussed on the basis of their effects on an atomic scattering factor curve. When the resolution of the data is limited, occupancy and temperature factors affect scattering-factor curves in a similar fashion, and t…