Materials Literature
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The crystal structure of 2DBTZP·H2O [DBTZP = 2,6-bis(5-butyl-1,2,4-triazol-3-yl)pyridine] has been determined and shows a dimeric structure in which two ligands, with different protonation patterns, form four hydrogen bonds with an enclosed water molecule. Several crystal structures have been determined of lanthanide…
Histological and biochemical investigations were carried out in order to evaluate the chondrocyte compatibility of a recently developed biodegradable polyesterurethane-foam (DegraPol-foam). Therefore, cell adhesion, cell growth, and the preservation of chondrocyte phenotype was measured in rat xyphoid chondrocytes see…
In order to improve their adhesion to polyurethane adhesives, three unvulcanized block styrene-butadiene-styrene (SBS) rubbers with styrene contents between 33% and 55% were surface-treated with solutions of 2 wt% trichloro-isocyanuric acid (TCI) in ethyl acetate. The joint strength was estimated using T-peel tests an…
Three modifications of the sodium hydrogen sulphate (NaHSO4·H2O, A-NaHSO4, B-NaHSO4) have been prepared. Their vibrational spectra have been measured. The results are discussed in relation to the structures of crystals. The good agreement between the crystal structure, selection rules and vibrational spectra is observ…
The interaction between K atoms and the (110) rutile surface was analyzed by performing ab initio Hartree−Fock calculations and molecular dynamics simulations, demonstrating that the interaction is mainly electrostatic. The preferential sites of adsorption were determined, and the effect of the coverage was studied. O…
The d2–d2 homobimetallic complex (Cp2V)2(3η:4η-Me3-SiCC–CC–CCSiMe3) was synthesized from Me3SiCC–CC–CCSiMe3 and Cp2V and characterized by an X-ray crystal structure; magnetic moment measurements from 300 to 2 K indicated a weak antiferromagnetic J exchange coupling of –3.7 cm–1.
(1999). Corrosion properties in weldments of stainless steels (1). Metallurgical factors affecting corrosion properties. Welding International: Vol. 13, No. 11, pp. 845-854.
The stereochemical features of the interaction between the sulfur atom of methionine residues and surrounding atoms are examined on a large set of known protein crystal structures. It appears that the minimum energy conformations observed in small molecule crystals are not observed within the protein core. This sugges…
The synthesis of a new family of 1,2-diarylethenes, helically locked 1,2-dithienylethenes, is reported, along with their photochromic properties in solution and as polymeric films.
Ferroelectric domain assemblages of bulk and thin film Pb(Zr,Ti)O3 (PZT) ceramics are characterized as a function of grain size. Specifically, domain morphologies of chemically prepared, bulk PZT 95/5 (rhombohedral symmetry) ceramics are compared to tetragonally distorted perovskite PZT thin films of composition rangi…
Carbothermal reduction of titanium dioxide is a very complex reaction. It comprises several successive or simultaneous reactions, interest being focused on the sequence: which is itself composed of two reactions: the first being a quasi-equilibrium which fixes the partial pressure of carbon dioxide for the second reac…
A microscopic model for the description of the proton subsystem dynamics in superionic crystals with hydrogen bonds is developed. Besides the inclusion of the proton-transport mechanism, the effect of the displacement of the nearest oxygens during hydrogen-bond formation is taken into account. The latter effect is the…
The energy-resolved momentum densities of thin polycrystalline aluminium films have been measured using electron momentum spectroscopy (EMS), for both the valence band and the outer core levels. The spectrometer used for these measurements has energy and momentum resolutions of around 1.0 eV and 0.15 atomic units, res…
The crystal and molecular structures of three reaction products formed between dimethyl sulfide and bromine have been characterised by high resolution powder synchrotron X-ray diffraction. Depending on the method of preparation, three compounds have been identified as (CH3)2SBr2, (CH3)2SBr2.5 and (CH3)2SBr4. The first…
Se citan diez taxones de diatomeas por primera vez para la Amazonia colombiana. Los taxones pertenecen a los géneros Cyclotella (1), Aulacoseira (2), Achnanthes (1), Lemnicola (1), Amphipleura (1), Gyrosigma (1), Stauroneis (1), Hantzschia (1) Y Nitzschia (1). Cuatro de ellos, Aulacosiera granulata var. anqustissima,…
The Ca-sequestering capacity of the equimolar mixture of aldonic acids or aldaric acids obtained by selective catalytic oxidation of the hydrolysis products of lactose (D-glucose and D-galactose) was determined using a Ca ion selective electrode. Also, the Ca-sequestering capacity of each component of these mixtures w…
It is known that an ultra-fine grain size can be achieved by a special intense plastic straining processes. In this paper, the authors propose a novel intense plastic straining process named the Accumulative Roll-Bonding(ARB) for bulk materials. In the process, a strip is put on another strip neatly, at first. The two…
The objective of this paper was to determine the time course and extent of platinum uptake into human malignant glioma tissue. An intraoperative, intravenous infusion of carboplatin was given to nine patients (seven glioblastoma and two anaplastic glioma) undergoing tumour excision. Carboplatin dosage was calculated i…
To study the effect of ion pairs (f and d–f) coupled in a polymeric system on their optical and magnetic properties, syntheses of homo- and heteronuclear systems were undertaken. Single crystals of the polynuclear Nd glutarate of formula [Nd(Glut)(H2O)4]Cl·2H2O (1) were obtained. The X-ray diffraction analysis shows t…
Electromigration behavior under pulsed directional current (PDC) was investigated theoretically and experimentally. A vacancy diffusion equation under current stress was derived, and the relationship between vacancy concentration and time to failure was calculated numerically. The results show that if Joule heating is…