Materials Literature
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This paper describes a multichip module technology based on highly impermeable liquid crystal polymers (LCPs) to interconnect and package monolithic microwave integrated circuits (MMICs). Because of the low moisture permeability of the LCPs, the packages can be made hermetic without heavy expensive housings can be two…
Specifications for PD tests on cables and equipment have been harmonized gradually during the past thirty years. However, there are still marked differences in the requirements for overvoltage conditioning, prior to PD tests, also in the voltages at which PD measurements are made. The merits of various specifications…
The application of liposomes as carriers for imaging agents is considered. Liposomes loaded with the appropriate contrast agents have been shown to be suitable for gamma-, magnetic resonance (MR), computed tomography (CT) and ultrasound imaging. The methods are briefly described to prepare liposomes loaded with differ…
Six fiberglass casting tapes were evaluated in bending, using an unstable fracture model. Cylindrical casts were constructed and evaluated in bending at 2, 3, and 24 hours after application. Scotchcast Plus (3M, St. Paul, MN), Vet Cast II (3M), and Zim-Flex (Zimmer, Warsaw, IN) were significantly stronger than other m…
Solid solutions of SrZr1-xYxO3–0.5x having orthorhombic perovskite-type structure with 0⩽x⩽0.2 have been studied. The conductivity increased and the activation energy decreased with yttrium content up to x = 0.2 at low temperature or x = 0.05 at high temperature. The proton and oxygen transference numbers measured in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHard/Soft Interactions in Early Transition Metal Thioether Macrocyclic Chemistry: Synthesis and Single Crystal Structure of cis-[CrCl2([14]aneS4)]PF6 ([14]aneS4 = 1,4,8,11-tetrathiacyclotetradecane)Neil R. Champness, Sarah R. Jacob, Gillian Reid, and Christopher S. FramptonC…
Light steel frame (LSF) building systems are becoming more prevalent in commercial, industrial and residential construction in New Zealand. Tested fire resistance ratings are generally available for non-loadbearing LSF drywall systems lined with gypsum plasterboard. No test information exists for loadbearing systems.…
The triboemission behavior of charged particles was measured under boundary lubrication of saturated hydrocarbon liquids during scratching of various solids by a diamond stylus. The solids tested were the metals Cu, Al and Fe, ceramics Si, ZrO2, Si3N4, Al2O3, soda lime glass and mica, polymers of 6, 6-nylon and PTFE.…
The crystal structure of the p-cyanophenyl nitronyl nitroxide [2-(4-cyanophenyl)-4,4,5,5-tetramethyl-4,5-dihydro-1-H-imidazol-1-oxyl 3-N-oxide, abbreviated as p-CNPNN] radical has been solved. It belongs to the orthorhombic system, space group Ic2a, with a= 10.482(2)Å, b= 26.615(5)Å, c=9.903(2)Å and Z= 8. The asymmetr…
Abstract Refractive indices have been evaluated from DUFFY'S optical electronegativities. The validity of the proposed empirical relation has been tested in the case of II–Vi, III–V compound semiconductors and alkali halides by comparing the calculated values of n with those in the literature. The estimated refractive…
The gene encoding the silk protein P25 is specifically transcribed in the posterior silkgland of Bombyx during larval intermoults and is repressed during moults. By performing in vitro DNA-protein interactions, at least five putative regulatory elements were localized in the 5' flanking region of the gene. The most pr…
A recently reported method for the determination of contact angles of small monodisperse spherical particles with liquid/vapour interfaces has been extended for the measurement of line tensions of the solid/liquid/air contact line. The method involves compressing monolayers of particles on a liquid substrate in a Lang…
Fundamentals Introduction Corrosion by Liquids Corrosion by Gas Corrosion by Solid Surface Effects Acid/Base Effects Thermodynamics Kinetics Diffusion Summary of Important Concepts Additional Related Reading Exercises, Questions, and Problems References Methods of Corrosion Analysis Introduction Laboratory test vs. Fi…
Concerns the use of 14N signals in RDX and HMX. The principle is to subject the quadrupole nuclei to bursts of RF radiation and monitor the signals generated in the quiescent periods between pulses. These signals may be divided into two types: free induction decays (FID) and echoes. The first is the decaying signal ob…
Abstract
Important building block ligands such as 2-thioxo-1,3-dithiole-4,5-dithiolate (dmit) and ethene-1,2-dithiolate (thiolene) form metal complexes that have been found to exhibit metallic conductivity and superconductivity. The syntheses of three well defined building block ligands that can lead to new molecular conductor…
Efficient metallurgical and processing development requires ability to predict the solidification microstructure of products. Models were developed to calculate possible growth morphologies and phases in order to select the most efficient one for a given solidification condition. It is then possible to predict solidif…
Sintered (Nd,Dy)-Fe-B-magnets were manufactured by adding low melting RE/sub 3/Co or RE/sub 3/Co/sub 2/ alloys (RE=Nd or/and Dy) to basic alloys with compositions close to the Nd/sub 2/Fe/sub 14/B stoichiometry. The remanent polarizations and the coercivities of sintered and annealed magnets with about 2 wt.% Dy range…
d-Electron stabilisation energies provide a general framework for extending conventional Molecular Mechanics to open-shell complexes; a single set of Force Field parameters successfully models both planar CuN4 and Jahn–Teller distorted, tetragonally elongated CuN6 amine complexes.
Reduction of siliceous manganese ore containing 41.0 wt%Mn and 11.0 wt%SiO2 by graphite has been studied by the measurement of weight loss in argon atmosphere at 900, 1200 and 1400°C and following by X-ray diffraction and Microprobe analyses. The ore was sized to –150+53 μm and preliminary calcined at 1000°C in argon…