Materials Literature
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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…
Third in a series that addresses the design and operation of oxygen systems. The goal of the series is to build a reference for both the skilled and the uninitiated in the concepts and practices for the design and maintenance of all types of oxygen system
A simple method is presented to estimate low-frequency eddy-current losses in long nonmagnetic conductors of uniform cross section when subjected to axial or transverse magnetic field. The method involves calculation of the moment of inertia of the conductor cross section. In the case of transverse fields, the relatio…
Aromatic nitro, azoxy, azo and hydrazo compounds were reduced with the sodium borohydride-nickel boride system to the corresponding reduction products under mild conditions.
Dosimetry and biological effects of 40 and 50 keV low-energy X-rays generated by a SOFTEX Model CMBW-2 apparatus were studied. Doses were measured using a thin-window parallel-plate ionization chamber; beam quality was assessed using aluminum absorbers; exposure rates per unit current were determined according to the…
The solution properties of complexes formed from azo(benzo-18-crown-6)(1) and polymethylene-α,ω-diammonio cations [H3N+(CH2)nNH3+(2)] have been evaluated through measurements of average molecular weights, viscosity, n.m.r. spectra, and electrical conductance. The trans compound (1) and (2; n= 6) forms a polymeric comp…
Dicopper(II) complexes of 20-membered N4 binucleating macrocycles L1–L3 derived by a cyclic [2 + 2] condensation of diformylthiophene or diformylfuran with the appropriate diamine have been synthesised and characterised by analytical, spectroscopic, magnetic, and X-ray diffraction methods. A pair of bridging ligands,…
The hydrated volumes, Vh, of collagens extracted from various fish species were calculated by using the Simha-Einstein equation, and it was found that the hydration of warm-water fish collagen is greater than that of cold-water fish collagen (halibut). Although the intrinsic viscosities of warm-water fish (bigeye-tuna…