Materials Literature
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Carbon (fiber)-carbon (matrix) composites have the highest thermal conductivity per unit density among materials suitable for thermal management applications. C-C composites also have high toughness and their mechanical strength increases with temperature. We have developed C-C materials and structures for heat manage…
Tin phosphate glasses, of general formula x SnO · (1 − x )P 2 O 5 (0.3 < x < 0.8), have been prepared by conventional melt-quench techniques and their structures studied using 31 P and 119 Sn nuclear magnetic resonance. The distribution of [PO 4 ] Q n species changes with composition in accordance with the simple bina…
The application of interleaving techniques is a very common practice in the construction of transformers for electronic circuits, in order to reduce the AC resistance and leakage inductance. However, the effects of the interleaving techniques on the capacitive effects is not so well known. This work presents a study o…
The study of the biological consequences of oxidative damage to DNA requires the characterization of DNA lesions at a molecular level. The oxidation of guanine in the dinucleoside monophosphate, d(GpT), by a metal-oxo porphyrin produces a dehydro-guanidinohydantoin derivative. The (1)H NMR spectrum of this oxidized gu…
Degradation of XLPE cable by water trees gives rise to harmonics in the loss current. The authors are engaged in development of diagnostic methods for water tree degradation utilizing these harmonic components. As a result of this development, the following was discovered. The harmonic components occurring in the loss…
This paper describes deterioration phenomena and mechanisms on silicone rubber housings of the polymer insulators by corona discharges. The corona discharge was observed on the trunk portion the insulator tested in a fog chamber. Nitric acid and ozone generated by the corona discharge were recognized on that trunk por…
Theoretical electronic structure studies on the anionic and neutral ${\mathrm{Al}}_{13}X$ $(X=\mathrm{Li}--\mathrm{Cs})$ clusters have been carried out using a gradient corrected density-functional approach. The alkali atoms occupy the hollow sites on the ${\mathrm{Al}}_{13}$ icosahedron surface and the calculated ver…
The mutual solubilities and liquid–liquid equilibria of acetonitrile binary systems with different compounds exhaustively and critically are reviewed. The compounds include water, inorganic compounds, and a variety of organic compounds (hydrocarbons, halogenated hydrocarbons, alcohols, carboxylic acids and esters, nit…
During the last twenty years many papers have been presented on the subject of aging of silicone rubber under conditions of high voltage, outdoor environment and contamination. Many opinions on the aging mechanisms of silicone rubber have been published. This paper will review current and previous works which have add…
This paper analyses scale effects for actuator types which are strong candidates for micro-actuation: shape memory alloys (SMAs), electrostatic, electromagnetic and piezoelectric actuators. SMA actuators are studied in detail and compared to the other actuator types on a basis of force, response time, and power densit…
We report the synthesis, electronic properties, and second-order nonlinear optical (NLO) response of asymmetric heteronuclear push−pull bimetallic complexes with pyrazine (pyz) and trans -1,2-bis(4-pyridyl)ethylene (BPE) as polarizable linkers, connecting the “W(CO) 5 ” fragment (acting as donor group) and “ cis -Rh(C…
Molecular dynamics (MD) simulations are undertaken on a series of five copolyimides based on two different dianhydrides: the flexible 4,4‘-oxydiphthalic dianhydride (ODPA) and the rigid bulky bicyclo(2.2.2)-oct-7-ene-2,3,5,6-tetracarboxylic dianhydride (BCDA). The diamines are respectively 4,4‘-oxydi(phenylamine) (ODA…
beta-[SiW(12)O(40)](4)(-) (C(3)(v) symmetry) is sufficiently higher in energy than its alpha-isomer analogue that effectively complete conversion to alpha-[SiW(12)O(40)](4)(-) (T(d)) is observed. By contrast, beta- and alpha-[AlW(12)O(40)](5)(-) (beta- and alpha-1; C(3)(v) and T(d), respectively) are sufficiently clos…
An efficient method for doping a transition metal oxide (TMO) with hole carriers is presented: photocarrier injection (PCI) in an oxide heterostructure. It is shown that an insulating vanadium dioxide (VO 2 ) film is rendered metallic under light irradiation by PCI from an n-type titanium dioxide (TiO 2 ) substrate do…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Size-Tunable Silver Iodide Nanowires in Reverse MicellesSheng Xu, Haicheng Zhou, Jian Xu, and Yadong LiView Author Information Department of Chemistry, the Key Laboratory of Atomic and Molecular Nanoscience (China Ministry of Education), Tsinghua University, Beijin…
Using the density-functional perturbation theory, the vibrational and dielectric properties are calculated for five ${\mathrm{C}}_{3}{\mathrm{N}}_{4}$ crystalline phases. The vibrational frequencies are found to differ significantly from one phase to another, thus giving a strong support to the use of Raman scattering…
Composite polymeric insulators are increasingly being accepted by the traditionally cautious electric utilities worldwide. They currently represent about 70% of installed new high voltage insulators in North America. The tremendous growth in the applications of non-ceramic insulators is due to their advantages over th…
We describe a method for producing and characterizing electrically connected single-wall carbon nanotube scanned-probe tips. The stable contact resistance, of the order of 100 kΩ, makes these tips suitable for conducting probe applications. The nanotubes, grown by chemical vapor deposition, are mounted on the end of m…
Bundles of single-wall carbon nanotubes (SWCNTs) coalesce forming multiwall carbon nanotubes (MWCNTs), containing from two to six nested tubes, under thermal treatment at high temperatures [(2200-2400) degrees C]. This structural transformation is confirmed by extensive molecular dynamics (MD) simulations. The simulat…
Diagnostic measurements of dielectric materials can be performed either in time-domain or frequency-domain. If the dielectric material can be described as a linear system the acquired information in the two domains are in theory equivalent. In time-domain charging/discharging currents and recovery voltage are used and…