Materials Literature
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Abstract Chromating of metals has been used for a long time as corrosion protection. In this study two commercial products for chromating, one based on chromates (Iridite 9L‐6) and one with an addition of a polymer (Okem Coat F1), have been analysed on hot‐dip‐galvanized steel, 55% AlZn‐coated steel and pure Zn, Al an…
This paper discusses a generalized Stefan problem which allows for supercooling and superheating and for capillarity in the interface between phases. Simple solutions are obtained indicating the chief differences between this problem and the classical Stefan problem. A weak formulation of the general problem is given.
For an interface between two isotropic media the power reflectance Rν(ϕ) is an even function, Rν(ϕ) = Rν(−ϕ) of the angle of incidence ϕ; hence all the odd derivatives, Rν(n) = dnRν/dϕn (n odd), are identically 0 at ϕ = 0, independent of the incident polarization ν. When the incident light is unpolarized (ν = u), the…
Abstract Polycondensation processes include up to three distinct process stages: prepolymerization, polymerization, and finishing. One or more of these stages often have serious reaction rate limitations due to chemical equilibrium and the need to remove a condensate product. The problems arising in each process stage…
We report results of a Raman-scattering study of the n=4 (\ifmmode\pm\else\textpm\fi{}${\mathbf{q}}_{1}$,\ifmmode\pm\else\textpm\fi{}${\mathbf{q}}_{2}$) incommensurate phase (phase II) of biphenyl under hydrostatic pressure. We make use of a peculiar property of biphenyl, i.e., the stabilization under pressure of this…
Abstract A combination of SEM, AES and angle‐resolved XPS (ARXPS) has been applied to analyse the distribution of chemical compounds in the surface region of electrochemically etched molybdenum tips and to determine the contamination layer thickness. Carbon monoxide, graphite, molybdenum carbide and molybdenum oxide w…
Fine Fe particles produced by evaporation in Ar gas are applied to the observation of magnetic domains. Results of fundamental investigations of the patterns formed by the particles are described. Domain patterns of a Sm-Co polycrystalline magnet and magneto-optically recorded bit patterns in Tb-Fe-Co films are observ…
The BPh 4 − and BF 4 − derivatives of Co(NO) 2 (Py) 2 + 3 (Py = pyridine) have been prepared. In solution, whereas Co(NO) 2 (L) 2 + BPh 4 − (L = phosphane) and 3-BF 4 − are inert, 3-BPh 4 − decomposes rapidly in the absence of an excess of Py. Complex 3-BF 4 − crystallizes in the monoclinic system with two independent…
Abstract Thermal behaviour of HMS/RDX mixtures is studied by differential thermal analysis (DTA) and thermogravimetric analysis (TGA). It has been found that the temperature of polymorphic transformation of HMX shows an increase due to the presence of RDX. The enthalpies of the enothermic transformations depend on the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMelandrioside A, a Saponin from Melandrium firmumEun Hee Woo, Won Sick Woo, Gwendolyn N. Chmurny, and Bruce D. HiltonCite this: J. Nat. Prod. 1992, 55, 6, 786–794Publication Date (Print):June 1, 1992Publication History Published online1 July 2004Published inissue 1 June 1992…
Breakdown phenomena on surfaces of acrylic plates, 1 to 10 mm thick, were investigated under negative impulse voltage in atmospheric air. The 50% flashover voltage V/sub 50/ and the 50% corona inception voltage were measured, and the discharge phenomena were observed with an image converter camera, in the creeping dis…
The effects of additions of small amounts of Nb, Ti, Zr, and V on the intergranular precipitation of chromium carbides in N-bearing type 304 austenitic stainless steels have been studied by means of corrosion and tensile tests, x-ray diffraction measurement, and microstructure observation using optical and analytical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic reactions in liquid-crystalline solvents. Regiochemical control of bimolecular pericyclic reactions by cholesteric and smectic liquid-crystalline solventsWilliam J. Leigh and D. Scott MitchellCite this: J. Am. Chem. Soc. 1992, 114, 13, 5005–5010Publication Date (Prin…
Abstract Two series of Ni/TiO 2 and Ni/SiO 2 catalysts prepared by different methods have been characterized by XPS and Ar + sputtering. Depth profiles have been obtained from the intensity of the Ni 2p photoelectron peaks as a function of the sputtering time. The analysis has been carried out for samples in their pre…
Abstract The objective of this study was to determine the effect of arcillite, a calcined montmorillonite and illite clay, on the physical and chemical properties of a pine bark growth substrate and plant growth. To accomplish this, Cotoneaster dammeri ‘Skogholm’ and Rhododendron sp. ‘Sunglow’ were potted into pine ba…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexes of divalent lanthanides (ytterbium(II), europium(II), and samarium(II)) with decaboratesJames P. White III and Sheldon G. ShoreCite this: Inorg. Chem. 1992, 31, 13, 2756–2761Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Publishe…
Electrodeposition of waterborne anti-corrosion primers in the automative industry, F.M. Geenen the plastic jug kettle, A. Demaid how to make smaller and cheaper ceramic capacitors, A. Morell and J.-C. Niepce infra-red television by the pyroelectric effect - materials selection and deployment, D.A. Cardwell and G.H. We…
Abstract Formation constants of two-point hydrogen-bonded complexes of p-quinone dianions with CH3OH (1:2) have been successfully determined to be of the order of 104 dm6 mol−2. The origin of high reactivity of the dianions toward proton donors has been clarified experimentally and theoretically.
We have examined BN in an all-${\mathit{sp}}^{2}$ phase similar to that previously suggested for carbon. Although calculations predict that carbon in this structure, called bct-4, will be metallic, the band overlap in bct-4 BN is predicted to be very small or zero. Hence it is suggested that the BN structure is more l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTESR and ENDOR of pentacoordinated cobalt(II) porphyrinsG. P. Daeges and J. HuettermannCite this: J. Phys. Chem. 1992, 96, 12, 4787–4794Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/doi/10.…