Materials Literature
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Abstract We present a method for the adjustment of parameters in the mathematical modeling of industrial tubular reactors for high pressure polymerization of ethylene. We propose a reduced mathematical model for these reactors that aids in the task of model parameter update commonly done periodically in industrial pla…
Tetra(n-butyl)ammonium- oder Di(triphenylphosphan)iminium nitrosylacidophthalocyaninato(2–)manganat, (cat)[Mn(NO)(X)pc2–] (X = ONO, NCO, N3; cat = nBu4N, PNP) wird aus [Mn(X)pc2–], (cat)NO2 und (nBu4N)BH4 in CH2Cl2 oder aus Nitrosylphthalocyaninato(2–)mangan, [Mn(NO)pc2–] und (nBu4N)X (X = ONO, NCO, N3, NCS) bei T < 1…
Optical absorption and emission spectral studies of various phthalocyanine ( Pc ) molecules in dimethyl formamide (DMF) solvent are reported in this paper. Measurements have been done for free base, Eu , Fe , Mn , Sm , Cu , Zn , Nd and La Pc - s . The principal optical transitions viz B and Q are identified and some o…
Refractory alloys are being considered as structural materials in multitube, vapor-anode alkali metal thermalto-electric conversion (AMTEC) cells for future use in radioisotope space electric power systems. In these power systems, the AMTEC cells would operate at a heat source temperature of » 1150 K and a radiator te…
An Einkristallen der drei Titelverbindungen wurden röntgenographische Strukturbestimmungen durchgeführt. [Co(NH3)6][Fe(CN)6] (a = 1098,6(6), c = 1084,6(6) pm, R3, Z = 3) kristallisiert im CsCl-artig aufgebauten [Co(NH3)6][Co(CN)6]-Typ. [Co(NH3)6]2[Ni(CN)4]3 · 2 H2O (a = 805,7(5), b = 855,7(5), c = 1205,3(7) pm, α = 86…
Disposal of worn out tyres and other rubber-based products is a global problem. They are not biodegradable. Since they are crosslinked, they can not be recycled like thermoplastics. Keeping the environmental and economic factors in mind, it is envisaged that the disposal problem could be solved by incorporating ground…
Extended x-ray absorption fine structure and near-edge x-ray absorption fine structure techniques are employed to investigate the local structure and valency about Fe atoms in the diluted magnetic alloy semiconductor system ${\mathrm{Ga}}_{1\ensuremath{-}x}{\mathrm{Fe}}_{x}\mathrm{As}$ prepared by molecular-beam epita…
d-3-Phosphoglycerate dehydrogenase from Escherichia coli contains two Gly-Gly sequences that occur at junctions between domains. A previous study (Grant, G. A., Xu, X. L., and Hu, Z. (2000) Biochemistry 39, 7316-7319) determined that the Gly-Gly sequence at the junction between the regulatory and substrate binding dom…
The specific heat in the normal and superconducting states of single-crystal intercalation compounds of the host material 2H−TaS 2 was measured from 1.7 to 9 K by use of a thermal relaxation method. By studying two extreme cases of charge transfer n, namely the 9 Å methylene blue intercalation compound (9 Å MB + −TaS…
Controlled rate thermal analysis (CRTA) has been used to separate adsorbed formamide from intercalated formamide in formamide-intercalated kaolinites. This separation is achieved by removal of the sample at the end of the controlled isothermal desorption step. The temperature of this isothermal desorption is dependent…
A model is developed to describe the formation of metallic foams in which liquid drainage acts to collapse the foam before it can freeze. Numerical solution of the foam drainage equation, combined with the equations of heat conduction, provides new insight into the competition between these two processes. It also stim…
We study the ferroelectric system consisting of the sandwich structure (PbTiO3/BaTiO3/PbTiO3) by using the Ginzburg–Landau phenomenological theory, and emphasize the importance of the long-range coupling interaction to the ferroelectric behavior of the system. We find that after introducing the long-range coupling int…
Abstract Square planar [CuN4] copper(II) complexes, Rb2[Cu(succim)4]•2H2O (1), trans-[CuL2(R-chea)(S-chea)] (2), trans-[CuL2(R-chea)2] (3), (succim = succinimidate, L = 5,5-diphenylhydantoinate, and chea = 1-cyclohexylethylamine) were prepared and crystal structures were determined. Crystal data for 1 are monoclinic w…
When gas-filled microbubbles flow into an ultrasonic wavefield, the microbubbles interact with the ultrasonic waves and aggregate into large masses of bubbles. Those bubbles are trapped against the surrounding liquid flow by ultrasonic waves. In this paper, the microbubble trapping by an ultrasonic wavefield are discu…
Color generation in a typical liquid crystal device (LCD) is usually done via an array of absorptive color filters placed over the LC subpixels. These filters offer at best 33% transmission resulting in dark displays and the need for high intensity backlights. In this paper we clearly explain a new method of color gen…
Abstract Different procedures for preparing thermoplastic vulcanizates (TPVs), based on isotactic polypropylene (iPP) and ethylene—propylene—diene terpolymer rubber (EPDM), are used and analyzed in this work. In order to determine the effect of the vulcanization method on material properties, a rheological study, dyna…
Isothermal crystallization of a low-molecular-weight poly(ethylene oxide) from both isotropic and structured melts at low undercoolings has been investigated via simultaneous measurements of small angle and wide angle X-ray scatterings (SAXS and WAXS). An evolution of the SAXS pattern was observed prior to the appeara…
In the proposed experiment, the maximum amount of cadmium substitution in lead hydroxyapatite accounts for about 30 atom-%. The crystal structures of PbHA at different degrees of cadmium substitution for lead (4.9, 10.0, 22.4 and 29.0% Cd atoms) have been investigated by X-ray powder pattern fitting and 31P MAS NMR. T…
The crystal structure analysis of model organogallium amine-alkoxides Me2Ga(OCH2CH2CH2NH2) (2) and [Me2Ga{μ-OCH2CH(CH3)NH2}]2 (3), demonstrate how hydrogen bonding can effectively compete with metal−ligand coordination preferences in determining the molecular and crystal structure and how conformational changes in a l…
The nonlinear optical quantities, second and third harmonics (beta and gamma), were predicted using a quantitative structure-property relationship (QSPR) approach. Molecular orbital ab initio calculations were applied to generate easily accessible variables to be used in the partial least-squares analysis. Simplified…