Materials Literature
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This paper deals with discontinuous pollution layers deposited on the insulator surface. Two zones are known to form: a clean (dry) zone and a polluted (wetted) zone. The influence of the length and position of the dry zone on the leakage current and the arc length are investigated. These were made on a plane experime…
Perfluoroheptadecan-9-one is a selective and mild catalyst for the epoxidation of a wide variety of alkenes with hydrogen peroxide; after the reaction the catalyst can be easily recovered and reused without noticable decomposition.
Hetrogenisation of H3PW12O40 and (nBu4N)4W10O32 with silica provides new photocatalytic systems able to oxygenate cyclohexane with O2 without causing the oxidative mineralization process which typically occur on the surface of the photosensitive semiconductor TiO2.
The ligands N-methyl-2,7-diazapyrenium (Medap+), N-(2-pyrimidyl)-4,4′-bipyridinium (PymQ+), N-methyl-4-[trans-2-(4-pyridyl)ethenyl]pyridinium (Mebpe+) and N-phenyl-4-[trans-2-(4-pyridyl)ethenyl]pyridinium (Phbpe+) have been used to prepare a series of complex salts trans-[RuII(NH3)4(LD)(LA)][PF6]3 [LD = NH3 and LA = M…
Room-temperature dechlorination process for polyvinyl chloride (PVC) has been developed. The process employs a mechanochemical (MC) treatment of PVC and CaO mixture followed by washing of mixture with water. MC reaction between PVC and CaO was induced by the treatments with a planetary mill and a new type of mill name…
The synthesis and optical properties of 4,4′-bis(dialkylaminophenylazo)-2,2′-bipyridine and 4,4′-bis(dialkylaminophenylimino)-2,2′-bipyridine ligands are described; the corresponding dipolar bipyridyl zinc dichloride complexes have been prepared and their second order nonlinear optical properties determined by electri…
The synthesis of CdS nanocrystals has been carried out by the thermolysis of cadmium dichloride with trioctylphosphine sulfide as the sulfur source, in tri-n-octylphosphine oxide at 250 °C. The material shows quantum size effects in the optical spectrum. The onset of absorption for CdS is at ≈480 nm (bulk CdS, 515 nm)…
Several different types of SiC fiber tows were coated with BN and composited using chemically vapor‐infiltrated SiC to form single‐tow minicomposites. The types of SiC fiber included Nicalon ™ , Hi‐Nicalon ™ , and the new Sylramic ™ polycrystalline SiC fiber. The interfacial shear stresses were determined from unload–…
The main properties of NiTi alloys are presented, discussed and compared with respect to those of stainless steels. Special regard is given to the use of NiTi alloy as orthodontic wires and endodontic instruments. The superelastic properties of orthodontic wires and endodontic files are measured as a function of the a…
Cobalt can be doped into the layered alkali manganese dioxides, M x Mn 1 − y Co y O 2 for M = K or Na , during the hydrothermal synthesis from the alkali permanganates. A single phase is obtained up to about 5 % mol cobalt. The cobalt doping is found to enhance the conductivity by two orders of magnitude relative to p…
The precipitation of CaCO3 during washing treatments can be reduced by polymeric additives. This process of incrustation inhibition could be described by modeling the effects upon crystal growth. Molecular dynamics calculations were used. Different conformations of the additives on the substrates developed during the…
The crystal structure of tyrosine aminotransferase (TAT) from the parasitic protozoan Trypanosoma cruzi, which belongs to the aminotransferase subfamily Igamma, has been determined at 2.5 A resolution with the R-value R = 15.1%. T. cruzi TAT shares less than 15% sequence identity with aminotransferases of subfamily Ia…
The aim of this work was to optimize protein entrapment in pure poly(epsilon-caprolactone) (PCL) microparticles (MP) using the (water-in-oil)-in water solvent evaporation technique and bovine serum albumin (BSA) as drug model. Therefore, the preparative variables such as polymer solvent, protein/polymer ratio, polymer…
The X-ray crystal structure of native hydroxynitrile lyase from Hevea brasiliensis (Hb-HNL) has been determined at 1.1 A resolution. It refined to a final R of 11.5% for all data and an Rfree of 14.4%. The favorable data-to-parameter ratio at atomic resolution made the refinement of individual anisotropic displacement…
The purpose of this study is to prepare and characterize injectable carboplatin-loaded poly(D,L,-lactic-co-glycolic) acid copolymer (PLGA) microspheres for the intracerebral treatment of malignant glioma. The microspheres were prepared by an acetone/mineral oil emulsion and solvent evaporation method. Preparation vari…
Nanocrystalline InP was prepared at temperatures of 80-160 °C through a novel route: 4InCl 3 +12KBH 4 +P 4 → en 4InP. Mean crystallite dimensions of 11.3-20 nm were determined from X-ray powder diffraction. Transmission electron microscopy images showed that the products were 15-20 nm spherical grains when prepared at…
We review the dynamics of supercooled liquids approaching the liquid-glass transition, starting with the conventional generalized hydrodynamics formulation. Empirical models for the memory function are discussed, as are empirical models for the self-energy function for phonons in crystals. Two examples of microscopic…
The experimental information on the solubility in the various Fe phases of TiC, TiN and solutions between them has been assessed using thermodynamic modelling. A set of values for the model parameters is proposed and it is capable of reproducing the experimental information with reasonable accuracy. It is noted that t…
The genus Dictyosporium is reviewed, based on examination of type specimens as well as new collections from various localities. Three new species, D. giganticum, D. nigroapice and D. tetraseriale, are described. Twenty two species are accepted in the genus, and their conidial \nmorphology is iilustrated. The chara…
A samaria‐doped ceria composite powder produced by spray pyrolysis (SP) was employed as the anode material for medium‐temperature solid oxide fuel cells (SOFC). cermet electrodes were prepared with the expectation that their mixed conducting nature would enhance the electrode reaction rate and improve the operation ef…