Materials Literature
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The compound hexa-(3,7,11,15-tetramethylhexadecanyl)hexa- peri -hexabenzocoronene (HBC-C 4/16 ), soluble in most organic solvents such as chloroform and THF, was synthesized. This compound shows a stable discotic hexagonal columnar mesophase between −36 and 231 °C. Symmetrical sandwich cells of ITO/HBC-C 4/16 /ITO (∼1…
Results of an investigation of hydrogen-bonding mediated interparticle assembling and spatial properties from extremely dilute concentrations of the mediation agent are reported. Nanoparticles consisting of highly monodispersed decanethiolate-capped gold nanocrystal cores and α,ω-mercapto-alkanoic acids are highlighte…
Closed-loop computer control of solution supersaturation based on in-process measurements of the concentration using ATR-FTIR spectroscopy and adaptive determination of the corresponding temperature profile has been applied to control the crystallization of monosodium glutamate from an aqueous solution. The crystal si…
We present a study of the magnetic properties of YNiO$_{3}$ in the paramagnetic range, above and below the metal-insulator (MI) transition. The dc susceptibility, $χ_{dc}$ (measured up to 1000 K) is a decreasing function of T for $T >$150 K (the Néel temperature) and we observe two different Curie-Weiss regimes corres…
Spin transport properties at finite electric and magnetic fields are studied by using the generalized semiclassical Boltzmann equation. It is found that the spin diffusion equation for non-equilibrium spin density and spin currents involves a number of length scales that explicitly depend on the electric and magnetic…
Three-dimensional porous chromium oxide single crystals have been prepared by aminosilylation of the surface silanols of the template, SBA-15, anchoring of dichromic acid to the grafted amine groups, thermal decomposition of inorganic and organic compounds, and removal of the silica framework with HF.
The paper comments on a paper by Dawber and Scott published in Appl. Phys. Lett, 76,1060 (2000) and addendum (ibid. p.3655), which addresses an important issue of the physics of ferroelectric thin films - the role of oxygen vacancies in polarization fatigue. It is shown that the content of this paper (starting equatio…
Group-theoretical methods are used to analyze perovskite structures where both ferroelectric cation displacements and simple tilting of octahedral units are present. This results in a list of 40 different structures, each with a unique space-group symmetry. The list is compared with that of Aleksandrov & Bartolomé [Ph…
The preparation and characterization of highly dispersed metal nanoparticles in mesoporous silica SBA-15 are reported. The functionalization with organosilane to generate a monolayer of charged groups on the pore surface facilitates uniform distribution of ion-exchanged metal precursors in the channels of SBA-15, whic…
Polymerization of beta-butyrolactone (BBL) and beta-valerolactone (BVL) using the zinc alkoxide initiator (BDI-1)ZnO(i)()Pr [(BDI-1) = 2-((2,6-diisopropylphenyl)amido)-4-((2,6-diisopropylphenyl)imino)-2-pentene] proceeds very rapidly under mild conditions to produce poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxyvale…
Imaging of the platinum replica of the porous structure and low-pressure argon adsorption allowed us to elucidate the complicated porous structure of SBA-15. These techniques enabled us to draw a coherent picture of the evolution of the SBA-15 precursor mesophase as a function of the synthesis temperature. TEM of the…
Recent advances in thermal infrared (TIR) detection offer design options for space sensors requiring temperature sensitivity in the 0.1-0.5 K range. A cost vs. performance trade-off is illustrated with two "reference" sensor concepts. Both systems use all reflective front optics designed for low cost "bolt-together" a…
Of interest, is to find a mica paper tape with higher dielectric properties than commercially available tapes. This paper presents the results of a preliminary evaluation of Corona Resistant (CR) Kapton/sup (R)/ backed mica paper tape. These tapes were evaluated for possible use for high voltage coil groundwall insula…
In most of the engineering applications, air is used in conjunction with solid insulation. The interface forms a weak point for the occurrence of partial discharges (PD). Therefore it becomes essential to know the behaviour of the PD in such a system. The work presented in the paper is a study of the PD corona pulse s…
The normal method of operation for a GaAs MQW quantum confined Stark effect (QCSE) reflection modulator is given for a device operating wavelength, taken as 852 nm for the analysis in this paper. Modulation in the intensity of a reference optical beam is achieved by shifting the wavelength to achieve both low reflecti…
In order to investigate partial discharge (PD) degradation in composite insulating systems such as a prefabricated cable joint (PJ), we proposed an electrode system to simulate PD degradation at a solid-solid interface. It was observed that the tree at the EPR-epoxy resin interface tended to propagate into the epoxy r…
Long term aging tests of stator bar end arms were carried out over several months. Six specimens affected by one of three types of defect were studied. Those defects were corona activity, surface tracking and bar-to-bar discharges. All the specimens were submitted to an aging voltage of 20 kV c.a. Phase resolved parti…
The pattern of the lowest-lying energy levels of ${\mathrm{Fe}}_{12},$ a ferric wheel comprising $N=12$ antiferromagnetically coupled spins $s=5/2,$ has been determined by specific-heat measurements between 0.5 and 10 K and in magnetic fields up to 7 T. Within the framework of a semiclassical model, we evaluated the p…
The electrical conductivity of amorphous boron wafers obeys Mott's T/sup -1/4/ rule. BP and B/sub 12/P/sub 2/ show band conduction. The thermoelectric power of polycrystalline B decreases with increasing temperature, while that of amorphous B is almost constant in a wide temperature range. That of BP increases with in…
In response to intense development of hybrid electric vehicles throughout the world spurred by energy and environmental concerns, Ovonic Battery Company has developed a series of high power batteries suitable for a range of vehicle design concepts. We have developed a 60 Ah HEV battery with a power capability of 620 W…