Synthesis and structure of a new layered organic–inorganic compound containing unique chains of PbI2
Synthesis and crystal structure of [C 6 H 10 N 2 ]Pb 2 I 6 ·3thf which contains a novel lead iodide polymeric anion with a double-chain structure.
Materials Literature
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Isoelectric properties of the soluble matrices in relation to the chemical composition of some Scleractinian skeletons
Soluble matrices of four Scleractinian skeletons (Madrepora, Favia, Leptastrea and Fungia), were extracted and studied by isoelectric focusing (IEF). The main part of the extracted matrices is acidic. IEF gels are poorly stained or unstained by Coomassie Blue and silver. The positive Alcian Blue staining is indicative…
Application of the anisotropic extension of the theory of hysteresis to the magnetization curves of crystalline and textured magnetic materials
The existing isotropic model equations of hysteresis in magnetic materials have been extended to include the effects of anisotropy and texture. This has proved particularly important as the model has been used to describe an increasing range of magnetic materials in which anisotropy plays a significant role, for examp…
Flame-Retardant Characteristics of Natural Rubber Modified with a Bromo Derivative of Phosphorylated Cashew Nut Shell Liquid
Natural rubber (NR) in a typical semi-efficient vulcanization system was modified with flame-retardant additives such as bromo derivative of phosphorylated cashew nut shell liquid, antimony trioxide and alumina tri hydrate (ATH). Improvement in the flame retardancy of the vulcanizates was shown by the progressive incr…
X-ray and magnetic studies of scandium substituted Ni-Zn ferrites
The approach of simultaneous substitutions by aiming at a systematic dilution of both of the sublattices to obtain the highest possible magnetization in a given system has been made use of, since this parameter is highly desirable in the fabrication of core materials for switched mode power supplies (SMPS), Ferrite se…
Synthesis, characterization and electrochemical polymerization of eight transition-metal complexes of 5-amino-1,10-phenanthroline
The ability to prepare polymer films on the surface of glassy carbon electrodes (GCEs) by electrochemical polymerization of transition-metal complexes of 5-amino-1,10-phenanthroline (aphen) was investigated. Eight different metal ions (Mn II , Fe II , Co II , Ni II , Cu II , Zn II , Ru II and Os II ) were studied. A s…
Investigation of power loss in wound toroidal cores under PWM excitation
The pulse width modulation (PWM) inverter is widely used when voltage-frequency regulation is required. When laminated cores are energised by PWM voltage supplies additional losses occur due to flux distortion. The iron loss of three types of grain-oriented 3.25% Si-Fe toroidal cores was measured by means of a compute…
Tunable liquid-crystal filter for solar imaging at the He i 1083-nm line
A Lyot-Ohman filter for imaging near the solar He i 1083-nm line is described. Fast and continuous spectral tunability is provided by nematic liquid crystals. This solid-state filter has a free spectral range of 2.35 nm and a spectral resolution of 0.135 nm at the operating wavelength of 1083 nm. A wide-fielded design…
Iron loss under practical working conditions of a PWM powered induction motor
A study of additional loss in an induction motor supplied by a PWM inverter is presented in this paper. The magnetic material used in the motor is characterized, thanks to a suitable Epstein measurement equipment, under several excitation conditions: sine and ideal PWM waveforms similar to the voltage delivered by the…
Mechanical Properties and Structure of Ignition-Proof Mg–Ca–Zr Alloys Produced by Squeeze Casting
The effects of calcium and zirconium additions on the microstructures and mechanical properties have been investigated in the squeeze-cast ignition-proof magnesium alloys. The marked grain refining is achieved by the combined addition of calcium and zirconium because calcium promotes the dissolution of zirconium into…
Seawater Corrosivity Around The World: Results From Five Years of Testing
A world-wide test program was undertaken by ASTM Task Group Gl.09.02.03 to assess the relative corrosivity of seawater at 14 test sites. Aluminum alloy 5086 (UNS A95086), 90/10 copper-nickel (UNS C70600), and copper-bearing carbon steel (UNS K01501) test specimens were prepared at one location, shipped to the various…
Concerning the stereochemistry of poly(lactide), PLA. Previous assignments are shown to be incorrect and a new assignment is proposed
HETCOR NMR spectra reveal that previous assignments of the stereochemistry of poly(lactide) derived from rac and meso-lactide are incorrect; an alternative assignment is made at the tetrad level of resolution.
Pyrolysis chemistry of polysilazane precursors to silicon carbonitride
The cross-linking reactions and the decomposition processes of three different polysilazane precursors to silicon carbonitride have been investigated systematically in the course of pyrolysis to 1400 °C. The polymer to ceramic conversion chemistry was studied for the following precursors: (ViSiHNH) n (VS), (ViSiHNMe)…
Two-Dimensional Polymerization of Lipid Bilayers: Visible-Light-Sensitized Photoinitiation
The sensitized polymerization of synthetic lipid bilayers via visible-light irradiation of membrane-bound cyanine dyes is reported. Visible-light-initiated polymerizations were successful with liposomes composed solely or partly of either 1-palmitoyl-2-[10-(2‘,4‘-hexadienoyloxy)decanoyl]- sn -glycero-3-phosphatidylcho…
Effect of catalyst onin situ silica reinforcement of styrene–butadiene rubber vulcanizate by the sol–gel reaction of tetraethoxysilane
In situ silica reinforcement of styrene–butadiene rubber (SBR) vulcanizate has been achieved by the sol–gel reaction of tetraethoxysilane (TEOS) using n-butylamine as a catalyst. SBR was vulcanized with sulfur and soaked in TEOS and in an aqueous solution of the catalyst. When hydrochloric acid was used as a catalyst…
Reactions of water and methanol at hydrogen-terminated silicon surfaces studied by transmission FTIR
A simple method for studying the reactivity of hydrogen-terminated silicon surfaces via transmission FTIR spectroscopy is described. Abraded (100) single crystals of silicon, after etching in ammonium fluoride, show features in the IR spectrum that are assigned to Si–H stretching vibrations. Confirmation of the utilit…
Electron Energy-loss Spectroscopy Study of the Metal-insulator Transition in VO 2
Electron energy-loss spectra of VO 2 have been measured from perfect single crystalline areas of 100–180 nm diameter in the metallic and insulating phases. A sharp peak has been observed at 1.2 eV in the valence electron excitation spectra of the metallic phase but not in those of the insulating phase. We assign the p…
Investigations on Olenite with Excess Boron fromthe Koralpe, Styria, Austria
Chemical analyses of tourmaline crystals from a small pegmatite body, nearby the Stoihtte, Koralpe (Styria, Austria), exhibit a pronounced excess in boron, expressed by the simpli¢ed formula (Na0.43 Ca0.24&0:33) (Al2.43Li0.33&0:28)Al6(BO3)3(B1.23 Si4.87 O18)(O0.64(OH)3.36). A substantial substitution of silicon by bor…
Facilitated transport of amino acids by fixed-site jumping
Amino acids are transported with high fluxes through plasticized cellulose triacetate membranes containing large amounts of quaternary tetraalkylammonium salts; similar results are obtained using analogous polymer-supported liquid membranes.
Microdialysis Assessment of Fibrin Glue Containing Sodium Alginate for Local Delivery of Doxorubicin in Tumor-Bearing Rats.
This study was designed to assess a local drug delivery system of an anticancer agent, doxorubicin (DOX), using fibrin glue (Beriplast P) as a drug carrier. In vitro release of DOX from the fibrin glue was examined by a dialysis method in the presence and absence of sodium alginate. The in vitro mean dissolution times…