Viscoelastic Characterization of Reinforced Polyester Foams
Analyse transitoire (fluage sous flexion dans diverses conditions) et dynamique rigidite au voisinage de la temperature de transition vitreuse
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Constant composition study of crystal growth of dicalcium phosphate dihydrate. The influence of polyphosphates, phosphonates, and phytate
The influence of inhibitors of varying functional groups on the crystal growth of calcium phosphate dihydrate (CaHPO 4 •2H 2 O, DCPD) on DCPD seed crystals at pH 6.00, 37 °C, has been studied using the constant composition technique. The inhibitors studied include: (a) polyphosphate (sodium pyrophosphate, sodium hexam…
On the Synthesis, Selfradiolysis, and Catalytic Decomposition of Tritiated Ammonia and Methane
Based on experimental results on the catalytic decomposition of ammonia and methane into the elements a process for DT - recycling of molecular and chemically bonded deuterium / tritium from the fusion reactor exhaust gas is under development at KfK. In this context typical plasma contaminants like methane and ammonia…
Preparation and Structure of Lithium‐Ion‐Conducting Mixed‐Anion Glasses in the System LiBO 2 –LiBS 2
Oxysulfide glasses were prepared in a wide range of compositions in the system LiBO 2 ‐LiBS 2 . Temperatures of glass transition ( T g ), crystallization ( T c ), and liquidus ( T l ) were determined; a maximum of T g was observed near the composition with 20 mol% LiBS 2 . The electrical conductivity at 500 K ranges f…
A CONSTITUTIVE MODEL FOR STRAIN RATES FROM 10-4TO 106s-1
We have developed an addition to the Steinberg-Guinan high strainrate constitutive model that extends its validity to strain rates as low as 10-4 s-1. With this new model, we have successfully reproduced a number of rate-dependent, shock-induced phenomena in tantalum, such as precursor on reshock, precursor decay, and…
Spin Spin Interactions in Polynuclear Nickel(II) Complexes: A Low-Temperature Susceptibility and Magnetization Study of the Cubane Tetranuclear Complex Ni4II(chta)4(μ-OH)4(NO3)4.7H2O
The bulk magnetic susceptibility of the complex Ni4(chta)4(µ-OH)4(NO3)4.7H2O ( chta = cyclohexane-r-1,c-3,c-5-triamine) has been measured over the temperature range from 1.9 to 300 K at a field of 1 T. The observed data were fitted by a Heisenberg exchange model for the susceptibility of a cubane [Ni4II(µ-OH)4]4+ clus…
SPALLATION AND SHOCK-WAVE BEHAVIOUR OF SOME CERAMICS
To determine the best use of ceramics in shock-wave technology it is necessary not only to know certain dynamic characteristics like the Hugoniot elastic limit and the spall strength, but also the micromechanisms associated with their deformation and failure. This paper is a discussion of these different aspects for t…
The Need for Improved Contrast Media Ioxilan: Updating Design Theory
Because of computed tomography (CT) and digital subtraction angiography (DSA), other diagnostic procedures assisted by urovascular contrast media (CM) have decreased, but the annual total remains at 10 to 11 million procedures since 1980. This trend, expected to continue, suggests that CM will remain vital to medical…
Copper(II)-Lanthanoid(III) Hetero-Metal Binuclear Complexes of Compartmental Ligand, N, N'-Bis(3-Carboxy-Salicylidene) Ethylenediamine
The title complexes have been newly synthesized for the lanthanoid ions except for Ce and Pm. The effect of lanthanoid ions on the ligand field of copper(II) ion are discussed on the basis of electronic spectra.
Electronic structure of zinc phthalocyanine
The electronic structure of zinc phthalocyanine is investigated through MSXα computations and XPS experiments. Reasonable argeement is found between the qualitative structure of the molecular orbital diagram and the XPS spectrum. The visible spectrum is also discussed and the calculation is compared to previous semi-e…
Microdomains in poly(4-methyl-1-pentene) single crystals
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrodomains in poly(4-methyl-1-pentene) single crystalsP. Pradere, J. F. Revol, and R. St. John ManleyCite this: Macromolecules 1988, 21, 9, 2747–2751Publication Date (Print):September 1, 1988Publication History Published online1 May 2002Published inissue 1 September 1988ht…
Redistribution reaction of trichlorosilane in a fixed-bed reactor
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRedistribution reaction of trichlorosilane in a fixed-bed reactorK. Y. Li and C. D. HuangCite this: Ind. Eng. Chem. Res. 1988, 27, 9, 1600–1606Publication Date (Print):September 1, 1988Publication History Published online1 May 2002Published inissue 1 September 1988https://pu…
The Comparison of Black Polyvinylchloride (PVC) Tapes by Pyrolysis Gas Chromatography
Abstract Pyrolysis capillary gas chromatography (Py-GC) was used to compare thirty black polyvinylchloride (PVC) tapes. A 0.5-mm square of tape (about 25 μg) was found to be an adequate sample size. Tests of within-roll homogeneity showed sufficiently consistent pyrogram patterns throughout to allow correct matches to…
Solid-state organometallic chemistry of molecular metal oxide clusters: carbon-hydrogen activation by an iridium polyoxometalate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid-state organometallic chemistry of molecular metal oxide clusters: carbon-hydrogen activation by an iridium polyoxometalateA. R. Siedle, R. A. Newmark, K. A. Brown-Wensley, R. P. Skarjune, L. C. Haddad, K. O. Hodgson, and A. L. RoeCite this: Organometallics 1988, 7, 9,…
Nitrogen atom activation: the influence of porphyrin ring structure on the kinetics of the reaction of trifluoroacetic anhydride with nitrido manganese(V) porphyrins
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrogen atom activation: the influence of porphyrin ring structure on the kinetics of the reaction of trifluoroacetic anhydride with nitrido manganese(V) porphyrinsLawrence A. Bottomley and Frank L. NeelyCite this: J. Am. Chem. Soc. 1988, 110, 20, 6748–6752Publication Date…
Grain Growth of the Lime and Periclase Phases in a Synthetic Doloma
Simultaneous grain growth of the lime (CaO) and periclase (MgO) phases was studied in a synthetic, hydroxide‐derived doloma over the temperature range 1400° to 1700°C. The grain growth kinetic exponents were 5 and 6 and the activation energies 333±45 and 437±47 kJ/mol for the CaO and MgO phases, respectively. The larg…
Iron‐containing compounds as flame retarding/smoke‐suppressing additives for PVC
Abstract The incorporation of a range of iron‐containing inorganic and organometallic compounds into a semi‐rigid PVC formulation has been investigated. Limiting Oxygen Index and Smoke Density data were obtained across a wide range of formulations and the effects of the compounds on flammability and smoke generation a…
Pseudohalogeno Metal Compounds, LXXI [1] Hexaazidoplumbate(IV). Crystal Structure of [AsPh4]2[Pb(N3)6]
Abstract The crystal structure of [AsPh 4 ] 2 [Pb(N 3 ) 6 ] 2- has been determined by X-ray diffraction. The structure of [Pb(N 3 ) 6 ] 2- (C i symmetry) is analogous to that of [Sn(N 3 ) 6 ] 2- with covalent Pb-N bonds (222-226 pm) and angles Pb-N-N between 115 and 121°. Irridiation (daylight) of [AsPh 4 ] 2 [Pb(N 3…
Antireflection gold surface-relief gratings: experimental characteristics
A systematic procedure using the effective index method and impedance matching has recently been developed Appl. Opt. 26, 3123 (1987)] for the design of antireflection high-spatial-frequency rectangulargroove gratings on lossy materials including high conductivity metals. The design procedure in turn can be used as a…
Metal Getters for Tritium Storage
Whereas titanium is a getter material mainly suitable for the long-term storage of tritium, zirconium cobalt alloy can also be employed for the interim storage and transport of this gas. Activated zirconium cobalt alloy reacts within minutes with hydrogen at room temperature. At the composition of ZrCoH0.8 the dissoci…