Materials Literature
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Abstract A novel heterogeneous polymerization process for synthesizing particulate with a wide range of properties has been developed. This process, which is called semi ‐ suspension polymerization (SSP), consists of two steps. In the first step a mixture of monomer, polymer, initiator, and other required ingredients…
Abstract The diprotonated, bishydroperchlorate forms of three isomeric β‐octaalkyl‐substituted tetrapyrrolic macro‐cycles, namely, etioporphyrin II (1) , etio porphycene (2) , and etiocorrphycene (3) , have been characterized both in chloroform solution, by UV/visible spectroscopy and 1 H and proton‐correlated 2D 15 N…
Crack faces in solids are modelled as non-standard patterns whose standard parts are self-affine fractals. The morphological and mechanical features of brittle and ductile fracture are discussed. A concept of equivalent traction is employed to obtain the asymptotic stress fields near the crack tip, which in turn used…
The use of natural zirconolites to assess the effect of α-decay damage and geochemical alteration on the release of actinides from HLW wasteforms is critically examined. There is evidence that the natural zirconolites provide a good chemical and radi-ation damage analogy for the HLW wasteforms, but additional work is…
Abstract Ammonia present in the product gas from coal gasification may increase NO x emissions from IGCC systems. A fixed bed reactor was used to study the effect of calcined limestone (CaO) on NH 3 decomposition and reaction of NH 3 and NO. Reactions at temperatures to 900°C in helium and in gas compositions typical…
Abstract The K-Ar systematics of illite/smectite (I/S) mixed layers in deeply buried shales from the Gulf Coast, the North Sea and the Mahakam Delta basins have been compared to provide additional perspectives on the diagenetic evolution of these minerals. Comparison of the results suggests that illitization proceeds…
Isocitrate dehydrogenase from an extremely thermophilic bacterium, Thermus aquaticus YT1, was purified to homogeneity, and the gene was cloned by using a degenerate oligonucleotide probe based on the N-terminal sequence. The gene consisted of a single open reading frame of 1,278 bp preceded by a Shine-Dalgarno ribosom…
A liquid‐crystalline coordination compound immobilized on an oligomeric superstructure free from cross‐linking (see Figure) is reported for the first time. A highly versatile synthetic methodology is described that allows unsymmetrical, mono‐functionalized, metal‐containing liquid‐crystalline coordination complexes to…
Abstract Two partially‐stabilized zirconia materials, Mg‐PSZ and Y‐PSZ, were investigated in static and cyclic fatigue tests. The crack growth rates were determined as a function of the stress intensity factor (static tests) and the stress intensity factor range (cyclic tests). For all R ‐ratios investigated the crack…
Gagaminine, a steroidal alkaloid, was isolated for the first time from the root of Cynanchum wilfordi Hemsley (Asclepiadaceae), and its effects on lipid peroxidation and the activity of aldehyde oxidase (EC. 1.2.3.1) were investigated in vitro. This alkaloid suppressed significantly the formation of lipid peroxides in…
Abstract Diffusion coefficients have been measured for the two-shell cluster of Au55(Hdpbs) 12Cl6 (Hdpbs = diphenylphosphino-benzene-3-sulfonic acid) in water at varying ionic strengths. Hydrodynamic radius of the particles are found to be 1.44 nm as calculated from the diffusion coefficient at sufficiently high ionic…
Polarization and impedance measurements were carried out on an iron electrode in an anhydrous methanol solution of and containing organic corrosion inhibitors. They were alkylamines, N,N‐dimethylalkylamines, and alkanethiols with various carbon numbers. These inhibitors suppressed both cathodic and anodic processes of…
Abstract In this work, poly ether ketone ether ketone ketone (PEKEKK) was used as a thermoplastic adhesive for joining metals. Titanium and cobalt chromium alloys were joined to form tensile butt joints. These tensile specimens were used to evaluate bond performance. A controlled thermal processing cycle was used to m…
The preparation, structure, and properties of microcrystalline cellulose (MCC) from rice straw were investigated by IR, x-ray, viscometry, polarizing microscope, SEM, etc. The results are as follows: 1. The leveling-off degree of polymerization (LODP) obtained from rice straw is about 80–150. The dimensions of MCC gra…
PbTiO 3 (PT)‐PbO‐B 2 O 3 glass‐ceramics were produced by a sol‐gel process. Achievement of high PT content at levels unattainable by conventional glass‐ceramics preparation methods was semiquantitatively shown. PT content was similar to the designed PT volume fraction and seemed rather unaffected by the composition of…
Several families of transition metal oxide bronzes including the quasi one-dimensional molybdenum blue bronzes A0.3MoO3, the quasi two-dimensional (2D) Mo purple bronzes AMo6O17 and the quasi 2D monophosphate tungsten bronzes (PO2)4(WO3)2m show Peierls transitions leading to commensurate or incommensurate charge densi…
Abstract: For N-terminally fluoresceine labelled KLALKLALKALKAALKLA-NH2 (I) extensive incorporation into aortic endothelial cells (AEC) was found, resulting in an about 500-fold enrichment within the cell interior. The cellular uptake was not influenced by energy depletion and only partly by lowering the temperature t…
The polarized optical reflectance of the quasi-one-dimensional organic conductor (TMTSF)2ClO4 has been measured along the chain axis from the far-infrared (~8 meV) to the visible (~1 eV) at temperatures between 10 and 300 K. A self-consistent description of the far infrared reflectance and the high metallic conductivi…
Abstract Two smectites with different layer charge localization were used to characterize the chemical and structural aspects of minerals treated with 1.9 × 10 −2 m and 1 m heavy metal solutions (Zn 2+ and Pb 2+ ). Natural and treated smectites were analysed by: (1) X-ray powder diffraction first at 25°C and relative…
Abstract In this work, we have investigated by differential scanning calorimetry the enthalpy relaxation of two poly[methyl(α‐n‐alkyl)acrylates] in which it is possible to change the length of the two alkyl chains. In particular, we have evaluated the Narayanaswamy parameter, which controls relative contribution of te…