Materials Literature
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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.
The materials evaluated in fog produced from low (250 mu s/cm) and high (1000 mu s/cm) conductivity water include cylindrical rod samples of high-temperature-vulcanized silicone rubber and ethylene-propylene-diene monomer rubber (EPDM) containing various amounts of either alumina trihydrate or silica fillers, or both.…
We first present a digest of a previous theoretical study of one of us (F. B.) about the static aspects of wetting of thin fibers. This study includes the effects of long range Van der Waals interactions. Two points merit special attention : (i) the threshold value Sc of the spreading parameter for complete wetting is…
The backbone conformation of a liquid crystalline side-chain polyacrylate was studied by Small Angle Neutron Scattering (SANS) in the isotropic, nematic, smectic A and re-entrant nematic phases. A transition from an oblate backbone conformation (observed in the nematic and in the smectic A phases) to a prolate conform…
Inspection by microtomography of active devices, tuning, and repair of III–V microstructures and microcircuits have been performed using the capabilities of combined scanning-electron microscope (SEM) and low-voltage (0.5–20 kV) focused-ion-beam (FIB), or focused-droplet beam (FDB) system. In this instrument, the ion…