Materials Literature
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Like other diatoms, living cells of Chaetoceros decipiens Cleve expand lengthwise before they divide. During prophase, the nucleolus disappears in about 30 s. The spindle is very small but anaphase chromosome separation can be seen. Following rapid cleavage, the protoplasts contract, plasmolyzing slightly and transfor…
The early literature of catecholate complexes of Ni(II) is explained with regard to both high-spin octahedral and low-spin square-planar complexes. The former contain coordinated solvent, while the latter do not. The syntheses of the paramagnetic (S = 1; &mgr;(eff) = 2.93 &mgr;(B) at 300 K) octahedral Ni(II) complex N…
Cationic polymerization of isobutyl vinyl ether (IBVE) with acetic acid (CH3COOH)/tin tetrahalide (SnX4: X = Cl, Br, I) initiating systems in toluene solvent at 0°C was investigated, and the reaction conditions for living polymerization of IBVE with the new initiating systems were established. Among these tin tetrahal…
Abstract PEEK/carbon fiber composites were prepared by a modified diaphragm forming machine under vacuum. The study of the degree of crystallinity versus the differential scanning calorimetry (DSC) heating rate indicated that 50°C/min was an optimal heating rate to suppress the reorganization of the specimens crystall…
Molecule-based materials can exhibit a variety of technologically useful cooperative properties not associated with individual molecules, such as ferromagnetism, superconductivity, and ferroelectricity. Selected examples are used to illustrate the fact that, although in general the molecular structure differs in only…
Macrocyclic compounds constitute a potential class of corrosion inhibitors. In an attempt to develop effective corrosion inhibitors we have synthesized four macrocyclic compounds by condensing o‐ethylene diamine and o‐phenylene diamine with ethylacetoacetate and succinic acid; Their inhibiting action was evaluated on…
A numerical integration scheme is presented for integration of the pressure-sensitive yield criterion due to Gurson, suitable for explicit dynamic finite element calculations. This scheme utilizes a sub-increment approach to Mayntain stability for the large strain increments and intense triaxiality that can occur unde…
Intercalation of an ordered kaolinite with potassium acetate (KCHCOO) under a pressure of 20 bars and 220 °C, induced new Raman bands at 3590, 3603, and 3609 cm in addition to the normal kaolinite bands. These bands are attributed to the inner surface hydroxyls hydrogen bonded to the acetate. It is proposed that the i…
Replacing a tungsten oxide group of phosphotungstic acid with a Rh(II) acetate dimer yielded a species, Rh2POM, that catalyzed the electrochemical oxidation of L-methionine (L-Met), L-cystine, and As(III). The electrocatalytic activity of Rh2POM was greater than that of the simple Rh(II) acetate dimer in homogeneous s…
The thermal and morphological behavior of the first complete homologous series of liquid-crystalline polyacetylene derivatives has been investigated by means of X-ray diffraction, differential scanning calorimetry, thermogravimetry, and polarizing optical microscopy. The influence of the spacer length on the thermal b…
The RF plasma induced polymerization of 1-vinyl-2-pyrrolidone was examined under variable duty-cycle pulsed-plasma conditions. Large-scale progressive changes in the composition of the resultant polymeric films were observed with sequential changes in the plasma duty cycle employed during polymerization, all other pla…
High concentrations of 226Ra (865-2,383 Bq kg(1)) were measured in the coal-slags, originated from the region of the settlement Tatabánya, Transdanubian Middle Mountains, Hungary. These slags are commonly used as building materials in this district. The external gamma dose rate was measured in 188 rooms at different h…
The strength degradation of alumina/alumina:calcium‐hexaluminate/alumina trilayers, after damage from Hertzian contacts, is evaluated. Relative to the monolithic alumina and alumina:calcium‐hexaluminate constituent layer materials, the trilayers show markedly improved strength retention in the damaged state at high co…
We have used small-angle scattering to study the calcium dependence of the interactions between calmodulin (CaM) and skeletal muscle myosin light chain kinase (MLCK), as well as the conformations of the complexes that form. Scattering data were measured from equimolar mixtures of a functional MLCK and CaM or a mutated…
Thin, homogeneous films of a high electron affinity (n-dopable) polymer, poly(3,4-dicyanothiophene) (PDCTh), were prepared by in-situ thermal polymerization of 2,5-diiodo-3,4-dicyanothiophene on substrates. As a result of the presence of two cyano substituents on the thiophene backbone, PDCTh is an electronegative pol…
The bidentate dithiolate ligands N,N-diethyl-2,3-dimercaptobenzamide (H(2)-1), bis(N,N-diethyl-2,3-dimercaptoterephthalamide (H(2)-2), and 1,4-bis(hydroxymethyl)-2,3-dimercaptobenzene (H(4)-3) were synthesized from 2,3-dimercaptobenzoic acid or 2,3-dimercaptoterephthalic acid. The air-sensitive ligands form metallocen…
In this article, an all-electron first-principles total energy calculation with Gaussian-type functions for the wave functions, for the exchange correlation potential, and for the charge density has been applied for single chains of polyparaphenylene (PPP). A local-density approximation within a helical band structure…
A model graft copolymer in which position of graft points was set to the center of a backbone molecule was prepared via anionic living polymerization. Polystyrene-block-poly(p-tert-butoxystyrene)-block-polystyrene (PSt-b-PBSt-b-PSt) was prepared by three-stage sequential addition. The tert-butyl group was removed from…
The correlation between paramagnetic defects and the electron emission in diamond films, which were deposited by the chemical vapor deposition method, has been studied using electron-spin-resonance (ESR) and field-emission measurements. The paramagnetic defects, which are a carbon dangling bond in the diamond layer (P…
Radiation effects on the formation of conjugated double bonds in the thermal degradation of poly(vinyl chloride) (PVC) and poly(vinyl alcohol) (PVA) were investigated. Thin films of PVC and PVA were either irradiated with γ-rays at ambient temperature (pre-irradiation) and then subjected to thermal treatment, or irrad…