Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Summary Electrical anisotropy in the Earth is usually a scale effect, created by averaging over structures with a preferred orientation. Homogenization theory applied to typical geological structures can help to determine the range of values to be expected in electrically anisotropic formations. The staggered-grid fin…
The thermal, morphological and conducting properties of macromolecular organic-inorganic networks synthesized by the sol-gel process and containing a wide concentration range of europium trifluoromethanesulfonate, Eu(CF 3 SO 3 ) 3 , have been investigated. The hybrid matrix, U(2000), of these materials, classed as ure…
The synthesis of two series of thiophenes substituted with crown and oligoether groups either via isolating oxaalkyl chains (2, 7-11) or in direct π-conjugation (4, 12-15) is described. Electrooxidative polymerization leads to the corresponding crown and oligoether-functionalized polythiophenes P2, P7-P11, and P4, P12…
Electronic and structural properties of TiO2 species of various sizes, charges and stoichiometries, ranging from TinOmx clusters (n=1–3, m-n=0, 1, x=-1, 0, +1) to bulk rutile and its (110) surface, have been obtained by total energy calculation based on the density functional theory (DFT), in the local density and loc…
The use of synthetic and natural biodegradable plastics has been severely limited due to their strong sensitivity to processing conditions such as temperature. The object of our research is to develop novel biodegradable thermoplastic compositions and processing methods for making plastic articles reproducibly from so…
Potassium niobophosphate glasses and glass-ceramics of the family [ x Nb 2 O 5 .(50- x ) P 2 O 5 .50K 2 O]: y Fe 2 O 3 were studied by x-ray powder diffraction, infrared and Raman scattering spectroscopy. For the potassium-phosphate samples [50P 2 O 5 -50K 2 O] the iron oxide presents a network former behaviour, for 2…
In addition to the Cys-Xaa-Xaa-Cys motif at position 30-33, DsbA, the essential catalyst for disulfide bond formation in the bacterial periplasm shares with other oxidoreductases of the thioredoxin family a cis-proline in proximity of the active site residues. In the variant DsbA(P151A), this residue has been changed…
The successive structural phase transitions in the layer compound have been studied using single-crystal x-ray diffraction. The intermediate phase between 194 K and 214 K is found to be incommensurate; the satellite maps show that the modulation mode which characterizes the intermediate phase has . It is shown that th…
Vanadium-based BCC alloys are known to absorb a high amount of protium. But, they do not desorb absorbed-protium completely. This paper aims to clarify the effects of alloy composition and heat-treatment on the protium absorption-desorption properties of Ti-(0–35) at%V–Cr alloys.A Ti–35V–40Cr alloy was chosen as the s…
Reichardt's dye can be used to determine the surface characteristics of a range of inorganic and organic materials. This simple, rapid technique gives information regarding the polarity of the surface.
The material design of ceramic matrix composites (CMCs) is discussed in terms of fiber nature and architecture, interphases (pyrocarbon, BN, multilayers), matrices and seal-coating, taking into account lifetime considerations. CMCs are processed by liquid or gas phase routes. Besides the well established processing ro…
In rapid alloy solidification the dendrite-growth velocity depends sensitively on the deviations from local interfacial equilibrium manifested by kinetic effects such as solute trapping. The dendrite tip velocity-undercooling function was measured in dilute Ni(Zr) over the range 1--25 m/s and 50--255 K using electroma…
We have prepared ordered thin films of NiO and CoO in (100) orientation by evaporating Ni (Co) in an O2 atmosphere onto Ag(100). The films have been analysed by scanning tunnelling microscopy and low-energy electron diffraction. In the initial stage (coverage up to a few monolayers), growth and structure of the grown…
The ruthenium(II) complexes [Ru(dmb)2(LH)][ClO4]2 [dmb = 4,4′-dimethyl-2,2′-bipyridine; LH = 2-(4-nitrophenyl)imidazo[4,5-f][1,10]phenanthroline (PNOPH), 2-(3-nitrophenyl)imidazo[4,5-f][1,10]phenanthroline (MNOPH) and 2-(2-nitrophenyl)imidazo[4,5-f][1,10]phenanthroline (ONOPH)] and their deprotonated complexes have be…
We report the determination of the crystal structure of a new polymorph of the pharmaceutical material fluticasone propionate, which is obtained as a microcrystalline powder by a supercritical crystallization procedure; the structure was solved directly from powder diffraction data using our Genetic Algorithm techniqu…
We have previously demonstrated that liposomal doxorubicin (DXR), targeted against the CD 19 receptor of human B lymphoma (Namalwa) cells resulted in selective affinity of SIL[anti-CD19] for CD19+ Namalwa cells in vitro and significantly increased therapeutic efficacy in mice compared to non-targeted liposomal DXR or…
Synthetic hydrotalcite calcined at 350-550 °C was used for the removal of arsenate, chromate, and vanadate ions from water solutions. The initial anion concentrations were 0.002 mol l -1 . The sorption isotherms were measured at 20 °C and at neutral pH. The Langmuir adsorption isotherm was used for the sorption capaci…
Photoinduced optical phenomena in amorphous Sb2Se3–BaCl2–PbCl2 glasses are studied using experimental spectroscopic and theoretical quantum chemical methods. Photoinduced two-photon absorption (TPA) (for λ=10.6 μm) and second harmonic generation (SHG) (for the output wavelengths 5.3 μm) were measured. CO laser (λ=5.5…
Smectic liquid-crystalline states have been successfully gelled by low molecular weight hydrogen-bonded molecules and anisotropic fibrous aggregates of the gelling agents are obtained when the sol–gel transition occurs within the smectic temperature range.
We show how the growth of a dynamical correlation length and its associated susceptibility recently observed by the present authors and co-workers as T c is approached can be understood in an appropriate theoretical framework. We discuss some predictions for these quantities in the region below T c which have not yet…