Materials Literature
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Undoped and cobalt‐doped basal inversion boundaries were fabricated in ZnO bicrystals to investigate their current–voltage characteristics. High‐resolution transmission electron microscopy observations and energy‐dispersive X‐ray spectroscopy analyses for a cobalt‐doped bicrystal revealed that the boundary was highly…
This paper deals with an investigation of the trapping mechanisms and the “pumping” process on a device based on polycrystalline Chemical Vapor Deposited (CVD) diamond, recently tested as particle tracker. Photoconductivity measurements have been carried out during monochromatic illumination from near IR to above band…
When two miscible fluids, such as glycerol (glycerin) and water, are brought in contact, they immediately diffuse in each other. However if the diffusion is sufficiently slow, large concentration gradients exist during some time. They can lead to the appearance of an “effective interfacial tension”. To study these phe…
Abstract The flame retardancy and heat resistance of a phenol‐biphenylene‐type epoxy resin compound, which forms a self‐extinguishing network structure, were increased by the inclusion of a benzoguanamine‐modified phenol biphenylene resin. The benzoguanamine‐modified phenol biphenylene resin contains a benzoguanamine…
Abstract Two new species of Fragilariforma, F. cassieae sp. nov. and F. rakiuriensis sp. nov., are described from material from New Zealand, with reference to populations found in Australia. The new species are similar in shape and size to Fragilariforma lata and F. hungarica var. tumida but are separated on the basis…
The synthesis and characterization of sponges composed of polysaccharides crosslinked with different amine-containing natural polymers for the use as cell carriers is described. Sponges based on arabinogalactan, dextran, and amylose were synthesized by crosslinking with chitosan, or with the protein: gelatin, or bovin…
To specify the donor energy levels in TlInS2 single crystals, the dark electrical resistivity, photoconductivity and Hall measurements were carried out in the temperature range of 100–400 K, 110–350 K and 170–400 K, respectively. The Hall measurements revealed that the crystals exhibit an anomalous behavior of Hall vo…
Chlorophyllin (CHL) is the sodium-copper salts of chlorophyll derivatives. In this study, the CHL was derived from a traditional Chinese medicine, the Bombyx mori excreta. The CHL, at concentrations 25-400 microg/ml, reduced the proliferation of HL-60, K-562, S-180, and MCF-7 cells by 8.2-95.7% after 72 h of incubatio…
The Curie temperature of rare-earth Co intermetallics is investigated by self-consistent spin-polarized electronic-structure calculations on Y-Co compounds. The total exchange interaction of a given site with all other sites (J/sub o/) is calculated by the linear-muffin-tin-orbital method using the local force theorem…
Abstract Poly( L ‐lactide‐co‐β‐malic acid) was obtained after the hydrogenolysis of the copolymer of L ‐lactide (L‐LA) and β‐benzyl malate (MA). 1 H‐NMR demonstrated that the composition of the copolymer was identical to the feeding dose. Thermal property study revealed the morphology of the copolymer could be changed…
Abstract The syntheses of a series of novel tetrathiafulvalene derivatives substituted with four side‐chains terminating in hydrophilic amidoalcohol (arborol) groups are reported, for example the tetrathiafulvalene derivative 15 . Some of these arborol derivatives formed thin films by spin‐coating from methanol soluti…
Abstract. Three molecular theories are used to prediet the yield behavior of amorphous polymers for a wide range of temperatures and strain rates. These include the state transition theory of Ree-Eyring, the conformational change theory of Robertson and the disclinations theory of Argon. For each of these models, the…
The capacity of temperature modulated differential scanning calorimetry (TMDSC) technique to determine dynamical parameters is tested on several glass-formers of different fragility. We show that both the fragility index m and the stretching exponent β deduced from TMDSC are consistent with results from other spectros…
Plasma pressure consolidation (PPC) was used to synthesize exchange coupled composite magnets. The magnets were processed from a mixture of micrometer-size, anisotropic magnetically hard SmCo/sub 5/ and nanometer size magnetically soft Fe particles. High density magnets were obtained by PPC at a temperature as low as…
A Pb/sub 1-x/Lax(Zr/sub y/Ti/sub z/)/sub 1-x/4/O3(PLZT) electrooptic ceramic variable-rotatable waveplate and a compact inline polarimeter have been used to develop a fast feed-forward-controlled module for the continuous and complete conversion of polarization. This requires the control of only two parameters: the di…
Using the epilithic diatoms as indicators of environmental conditions, 10 lakes in the High Tatra Mountains were characterised with regard to their stage of acidification. The diatom communities were diverse; 210 taxa were found, including 27 species of north and alpine preference. On the basis of cluster analysis, tw…
A combination of increasingly stringent environmental legislation and economic competition is driving industrial processes further and further towards the three “E”s of chemical manufacture: economy, efficiency and environmental impact. In this paper, we present a novel aqueous method for the synthesis of polyimides.…
In attempts to bridge the complex [W(CO) 3 (phen)(pyz)] (phen = 1,10-phenanthroline; pyz = pyrazine) to acceptor centers, either soft centers such as cis -M(CO) 2 Cl (M = Rh(I), Ir(I)) and fac- M(CO) 3 Cl 2 (M = Ru(II), Os(II)) or hard centers such as BF 3, the pyrazine ligand is lost, while the fragment W(CO) 3 (phen…
The drain current-voltage (I-V) characteristics of Schottky-barrier carbon nanotube field-effect transistors (FETs) are computed via a self-consistent solution to the two-dimensional potential profile, the electron and hole charges in the nanotube, and the electron and hole currents. These out-of-equilibrium results a…
The scalar Preisach model of hysteresis is extended to the isotropic vector case by introducing a new type of elementary vector Play operators. The new isotropic vector hysteresis model can reproduce with reasonable accuracy the qualitative behavior of magnetic vector hysteresis in isotropic materials and is rather fa…