Pressure and Temperature Dependence of the Decomposition Rate of Aliphatic tert-butyl Peroxyesters
The thermal decomposition in solution of
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Infrared and Raman spectra ofL-valine nitrate andL-leucine nitrate
A comparative study of the infrared and Raman spectra of L-valine nitrate and L-leucine nitrate helps in determining the role of hydrogen bonds in these crystals. Both compounds have carboxylic and protonated amino groups in the cation while the nitrate ion forms the anion. The wavenumbers of several modes of vibratio…
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In this letter an approach for fitting saturation characteristic and hysteresis using arctangent functions is presented. It has direct application to modeling transformers and electric machines. The approach is based on measurements of the magnetizing curve of the ferromagnetic material. The analytical form of the cha…
Comparison of assumptions in computation of short circuit forces in transformers
This paper describes the modeling of shell type distribution transformers with varying degrees of complexity. Results from several types of studies are reported and used to evaluate the effectiveness of FEA methods for resolving the forces exerted on the coils of a single-phase shell form transformer. The sensitivity…
Improvement of properties of silica-filled styrene-butadiene rubber compounds using acrylonitrile-butadiene rubber
Since silica has strong filler-filler interactions and adsorbs polar materials, a silica-filled rubber compound has a poor dispersion of the filler and poor cure characteristics. Improvement of the properties of silica-filled styrene-butadiene rubber (SBR) compounds was studied using acrylonitrile-butadiene rubber (NB…
Biocompatible surfaces by immobilization of heparin on diamond-like carbon films deposited on various substrates
Although graphitic carbon has been known and used as a biomaterial for a very long time, the excellent biocompatibility of diamond-like carbon (DLC) films has been addressed only in a few cases. We anticipate the combination of bioinert DLC films and surface-immobilized bioactive biomolecules with antithrombogenic pro…
Selective enhancement of Raman or fluorescence spectra of biomolecules using specifically annealed thick gold films
Annealing of "thick" metal films deposited onto a smooth dielectric substrate leads to high-order self-organization of metal clusters on the film surface. This work presents the first experimental evidence that the "thick" gold film (TGF) may be specifically annealed to serve as a substrate for surface-enhanced fluore…
Effect of basicity on chemical bonding of metal ions in glass and its relevance to their stability
An investigation is made concerning the negatively charged environment, which the oxygen atoms of a glass provide for hosted metal ions, and the extent to which this changes on varying the glass composition. For Mn2+, d–d spectra show that the changes in the (average) oxygen electronic density of the glass are faithfu…
EQCM studies of polypyrrole films. Part 2. Exposure to aqueous sodium tosylate solutions under thermodynamically non-permselective conditions
We describe electrochemical quartz crystal microbalance studies of polypyrrole films exposed to concentrated aqueous sodium tosylate solutions, in which the polymer is non-permselective in doped and undoped redox states at equilibrium. Then, sources and sinks of salt within the film open up new mechanistic possibiliti…
Surface characterization and platelet adhesion studies on fluorocarbons prepared by plasma-induced graft polymerization
It is believed that the interactions between the biological environment and biomaterial surface are the key factors influencing its biocompatibility. Therefore, plasma processing, which can vary the surface properties without altering the bulk properties, has been considered as one of the important techniques for impr…
Pt(0) and Pd(0) based metallocryptands: metallophilic hosts for Pb(ii) ion
Metallocryptands based on trigonally coordinated Pt(0) or Pd(0) with P2phen [2,9-bis(diphenylphosphino)-1,10-phenanthroline] bind Pb(II) ion through very strong, closed-shell metallophilic interactions; their syntheses, characterization and X-ray crystallography are presented.
Photosensitized luminescence of novel β-diketonato Nd(III) complexes in solution
Photosensitized luminescence in the near-infrared region of five low vibrational β–diketonato neodymium(III) complexes, tris(1,1,1,5,5,5-hexafluoroacetylacetonato)neodymium(III) (1), tris(4,4,5,5,5-pentafluoro-1-pentafluorophenyl-1,3-pentanedionato)neodymium(III) (2), tris(4,4,5,5,6,6,6-heptafluoro-1-pentafluorophenyl…
Synthesis, structure and properties of new unsymmetrical nickel dithiolene complexes useful as near-infrared dyes
The new unsymmetrical [Bu4N][Ni(Pri2timdt)(dmit)] 4 and [Bu4N][Ni(Pri2timdt)(mnt)] 5 dithiolene complexes (Pri2timdt is the mono-anion of 1,3-diisopropylimidazolidine-2,4,5-trithione; dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate; mnt = maleonitriledithiolate) have been prepared from the reaction of the neutral complex…
The use of the CIGRE data format for PD diagnosis applications
A standardized format for partial discharge (PD) data recorded in gas-insulated switchgear (GIS) was proposed recently by a CIGRE Task Force (15.03.08). Being an open structure, the PD CIGRE data format can be used for all HV apparatus and equipment. Such a format is necessary to process PD measurements from any PD ac…
Chemical synthesis of silver nanoparticles encapsulated in boron nitride nanocages
Silver nanoparticles encapsulated within boron nitride nanocages were produced from mixtures of boric acid, urea and silver nitrate upon reduction at 700 °C in hydrogen; this is a useful fabrication method for the mass production of boron nitride nanocapsules at low temperatures compared to the ordinary arc discharge…
Field and laboratory aging of RTV silicone insulator coatings
The silicone-based coating applied to 345 kV post insulators in a substation on the shore of Long Island Sound has depolymerized over a period of about 7 years although no in-service failures have occurred. However, the increasing rate of depolymerization suggests that the coatings will have to be renewed in the near…
Effect of Microstructure on Fracture Mechanisms in Galvannealed Coatings.
Fracture mechanisms in galvannealed coatings have been studied by performing draw bead tests on galvannealed Ti stabilized interstitial free and Aluminum killed low carbon steel sheets and by investigating coating microstructures by scanning electron microscopy. Galvannealing treatments, on samples galvanized using an…
Thermal stability of polyurethane elastomers before and after UV irradiation
In this work, we investigated the thermal degradation behavior of segmented polyurethane (PUR) elastomers before and after UV irradiation. The thermal degradation of PUR elastomers was studied over the temperature range of 25–600°C in an atmosphere of nitrogen using thermal gravimetric analysis (TGA). Four series of P…
Hexalithiobenzene: A molecule with exceptionally high second hyperpolarizability
The electronic structure of the fully lithiated benzene molecule has been calculated at different levels of approximation with particular attention paid to its second hyperpolarizability. It has been estimated that lithiation of the benzene molecule may lead to the enormous increase of the second hyperpolarizability.…
The first lanthanide-templated molecular wheel containing six copper ions †
A novel copper(II)–praseodymium(III) hetero-polynuclear complex [Cu6PrL6][Pr(H2O)10]·14H2O (H3L: N-carboxymethyl-N-(2-carboxyphenyl) glycine acid) has been structurally and magnetically characterized, which consists of a molecular wheel of six Cu(II) ions with a Pr(III) ion axle.