Materials Literature
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This paper discusses environmental management and technical considerations for the decommissioning, closure and reclamation of a mine site. The management and technical aspects discussed include planning; decommissioning, closure and reclamation design basis and performance measures; implementation; monitoring; and fi…
We discuss the behaviour of a thin soap film facing a frame element: the pressure in the Plateau border around the frame is lower than the film pressure, and the film thins out over a certain distance λ( t ), due to the formation of a well-localized pinched region of thickness h ( t ) and extension w ( t ). We constru…
Microstructural changes associated with the martensitic transformation from cubic (parent phase) to trigonal (R phase) which occurs with decreasing temperature in Ti50Ni48Fe2 have been intensively studied by in-situ electron microscopy. Although the parent phase shows a characteristic microstructure with small domains…
Abstract Weathering profiles developed on the top surface of a bentonite (containing Al-Mg montmorillonite) and a K-bentonite (containing mixed-layer illite-smectite (I-S)) under Central European temperate conditions were studied by XRD, HRTEM, FTIR, K-Ar and chemical analyses. Weathering of montmorillonite results in…
The morphological metastability of spontaneous crystallization from the melt of short-chain semiflexible homopolymers was studied through dynamic Monte Carlo simulations of a lattice multiple-chain system. Frictional hindrance for the sliding diffusion of the chains in the crystallites was employed to enhance the meta…
Red single crystals of AuSO4 have been obtained by evaporating a solution of Au(OH)3 in concentrated sulfuric acid. The crystal structure (orthorhombic, Pbca, Z = 8, a = 854.9(2), b = 824.9(3), c = 1001.1(4) pm) exhibits the dumbbell shaped Au24+ cation (bond length Au–Au: 249 pm) which is coordinated by two chelating…
BaTi 1- x Mn x O 3 solid solutions with 0≤ x ≤0.04 were synthesized in reducing atmosphere ( P O2 <10 -9 Pa) and in air at 1350°C for 2 h. The effect of Mn ions with different valences on the crystal structure of BaTiO 3 was studied by the room-temperature Raman scattering, electron spin resonance (ESR) and X-ray p…
Esters or carbonates of N-hydroxypyridine-2-thione (Barton esters) were appended to either carboxymethyl or hydroxypropyl cellulose. Irradiation of the cellulose bound Barton esters in monomer initiated free radical graft copolymerization with minimal concomitant homopolymerization. Grafting of styrene to carboxymethy…
A method for estimating the signal-to-noise ratio from a single image is presented in this paper. The autocorrelation-based technique requires that image details be correlated over distances of a few pixels, while the noise is assumed to be uncorrelated from pixel to pixel. The latter is shown to be a good approximati…
The infrared to visible upconversion processes have been investigated for ${\mathrm{Nd}}^{3+}$-doped chalcohalide glasses with different halide modifiers by using steady-state and time-resolved laser spectroscopy. Two different upconversion mechanisms have been identified depending on the infrared excitation wavelengt…
Allosteric regulation of key metabolic enzymes is a fascinating field to study the structure-function relationship of induced conformational changes of proteins. In this review we compare the principles of allosteric transitions of the complex classical model aspartate transcarbamoylase (ATCase) from Escherichia coli,…
The polycondensation reactions of luminophoric dialdehydes 5 and bisphosphonates 3 provide a new type of π-conjugated polymers 7 with well-defined structure (—Ar—C≡C—Ar—C≡C—Ar—CH=CH—Ar— CH=CH—)n , which was confirmed by NMR, infrared and UV-Vis spectroscopy. High molecular weight (M̄w up to 500 000 g/mol), thermostabl…
The bulk morphology of a crystalline/amorphous diblock copolymer under different thermal conditions was studied. The diblock copolymer, poly((ethylene oxide)- b -1,4-polybutadiene), forms a microphase-separated lamellar morphology in the molten state. For samples crystallized within the range of 20−50 °C, TEM coupled…
Abstract Poly(amic acid) nanocomposites were synthesized from a dimethylacetamide (DMAc) solution with two organophilic montmorillonites (organo‐MMTs). It was then heated at various temperatures under vacuum, yielding 15–20 um thick films of polyimide/organo‐MMT hybrid with different clay contents (1–8 wt%). Dodecy‐la…
Abstract High internal phase emulsion (HIPE) copolymer and interpenetrating network foams were prepared from 2‐ethylhexyl acrylate (EHA), styrene (S) and divinylbenzene (DVB) using a unique process. The morphologies, thermal properties and dynamic and static mechanical properties of these foams were investigated. The…
MINCRYST is an original interrelated combination of the Crystal Structure Database for Minerals, Subbase of Calculated Polycrystal Standards (Calculated Powder X-ray Diffraction Standard Subbase, CPDS Subbase), and the Applied Program Package. The Information fund of the Crystal Structure Database comprises about 4800…
Abstract Crystallization of the 80Li2S·20P2S5 (mol%) glassy powders derived from mechanical milling improved their conductivities. The obtained glass–ceramic exhibited high conductivity of approximately 10−3 S cm−1 at room temperature. The stabilization of the high-temperature phase of Li7PS6 crystal in the glass matr…
We report photoemission spectroscopic studies of zinc sulfide nanocrystallites in the quantum size regime. The nanocrystallites studied have average sizes of 1.8, 2.5, and 3.5 nm and narrow size distributions as determined from UV-visible absorption spectroscopy, as well as x-ray diffraction and high-resolution transm…
First-principles molecular dynamics simulations are carried out to study the structural properties of liquid ${\mathrm{GeSe}}_{2}.$ We use a generalized gradient approximation for the exchange and correlation energy, which we find to improve significantly upon the local density approximation in describing both the sho…
A study was made of a series of one-layer and two-layer models of graphite surface and especially of interactions in the two-layer models. Seven one-layer models, of increasing size up to seven rings, in the C 6 n 2 H 6 n series were calculated for reference purposes with the Hartree−Fock method. Four two-layer models…