Materials Literature
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The underlying principles of the transfer‐matrix programs GIOS and COSY are outlined. Especial emphasis is given to the calculation of particle trajectories and of image aberrations. Input and output of a second‐order calculation of GIOS is shown.
New electropolymerizable metal Schiff-base complexes (M = Ni, Co, or Mn) were prepared for use in polymer modified electrodes by incorporating two N,N-dimethylaniline-like moieties onto the periphery of the salen (salen = ethylenebis(salicyldiminato)) ligand. Oxidative electropolymerzation appears to occur by the tail…
Abstract The Stokes flow of a micropolar fluid past a Newtonian fluid spheriod whose shape deviates slightly from that of a sphere is investigated. To the first‐order in the small parameter characterizing the deformation, an exact solution is obtained. As an application, the case of a fluid oblate spheroid is consider…
The reaction of primary and α,α-disubstituted α-amino acids with pyridoxal in the presence of N-phenylmaleimide in various solvents at temperatures up to 120 °C gives rise to two series of cycloadducts. One series arises from azomethine ylides formed by decarboxylation of the intermediate pyridoxal imines whilst the o…
Based on an ellipsoidal particle model, the equivalent diameter for the slip correction, diffusion coefficient, and diffusion diameter of fibers were obtained from the adjusted sphere method of Dahneke. The diffusion coefficient calculated for polydisperse crocidolite fibers compared favorably with available experimen…
Abstract A method to obtain the tenacity and Young's modulus of nonwoven webs without direct measurement of web thickness is proposed. This has been tested with several series of samples with different basis weight. It was found that these properties were nearly Independent of the sample gage length, and both tenacity…
Phase transformation and thermal conductivity of hot‐pressed β‐SiC with Al 2 O 3 and carbon additions were studied. Densification rate was a complex function of both Al 2 O 3 and carbon. Simultaneous additions of Al 2 O 3 and carbon accelerated the 3C → 4H phase transformation. Carbon additions lowered the thermal con…
Time-resolved transmitted-light spectra are obtained during the reappearance of the ‘crystal-like’ structure of a deionized polystyrene sphere after the rapid flow through a thin optical cell is stopped. Fast formation of metastable ordered structures finishes within 100 ms. Formation of the stable structure is attain…
Nearly four decades of research in bearing steel metallurgy and processing has resulted in improvements in bearing life by a factor of 100 over that obtained in the early 1940s. For critical applications such as aircraft, these improvements have resulted in longer-lived, more reliable commercial aircraft engines. Mate…
Treatment of a titanium dioxide polycrystalline powder with hydrogen peroxide produces a paramagnetic species with g1= 2.022, g2= 2.010, g3= 2.003. This radical, observed at atmospheric pressure, is proposed to be subsurface O˙–2i.e. the superoxide radical anion. The same species, although with different g values; g1=…
Sandwich cluster compounds of the type [M{Pt3(µ-CO)3(PPh3)3}2]PF6[M = Cu (1a) or Au (1b)], where the Group 1 B metal is co-ordinated simulataneously to two planar [Pt3(µ-CO)3(PPh3)3]triangulo rings, have been synthesised from [Pt3(µ-CO)3(PPh3)4] and either [Cu(MeCN)4]PF6 or [Au(L)Cl](L = CO or Me2S) in the presence of…
A novel macropentacyclic system (1) containing double layered porphyrin units which are bridged by four azobenzene links has been synthesized, two stable isomers being isolated, differing in spatial arrangement of the amide groups and azobenzene links; the complex formation of these compounds with zinc(II) is reported.
Nineteen different carotenoids have been isolated from various harvests of Mytilus edulis (edible mussels). Besides beta,beta-carotene (occasional) these were ten acetylenic C40-carotenoids: crocoxanthin-like, anhydro-amarouciaxanthin B, 19'-hexanoyloxyisomytiloxanthin, isomytiloxanthin, alloxanthin, mytiloxanthin, am…
Iron(II) cage complexes [Fe{(1-X, 8-Y)-sar}]2+(X = Y = H, NH2, or NH3+, or X = Me, Y = H, sar = 3,6,10,13,16,19-hexa-azabicyclo[6.6.6]icosane) show high-spin (5T2g origin)⇌ low-spin (1A1g origin) equilibria in solution, characterised by measurements of magnetism and visible and 1H n.m.r. spectra.
Two new phenylpropanoid diglucosides named syringinoside and coniferinoside have been isolated from the water-soluble fraction of Wikstroemia sikokiana FRANCE. et SAV. (Thymelaeaceae). Their structures have been characterized on the basis of spectral and chemical evidence.
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The interaction of methanol with zinc–chromium mixed oxides has been studied by temperature-programmed desorption (t.p.d.) in the range 430–770 K. Both the amount of methanol adsorbed and the amount of desorbed species in t.p.d. experiments, which can be taken as an indicator of the number of active sites responsible…
This paper is a summation of the author's work towards creating valid stress analysis of adhesively bonded structure. The context is airframe construction, specifically metal to metal bonds, and excluding sandwich structure. A model joint is presented as being a basic representation of the problem. A linear formula is…
Microwave energy has been demonstrated to be capable of heating pavements rapidly, uniformly, and to depths of up to 5 in. without overheating the surface. Microwave treatment of asphalt mixtures is believed to have the potential of improving asphalt adhesion to aggregate. Presented in this paper is the work that was…
Description Tutorial manual on galvanic corrosion; includes articles from industry, introductory and theoretical articles. Twenty-three papers divided into five sections: theory; computer prediction; testing and control; environments; and industries.