Materials Literature
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The attenuation of far-infrared (λ=0.119 mm) surface plasmons has been measured as a function of the thickness of a silicon overlayer on top of silver. Good agreement with theory was obtained indicating that the Drüde model for the dielectric constant of silver is valid out to these wavelengths.
Energetic ion beam irradiation of diamondlike carbon thin films induces a decrease of 4–5 orders of magnitude in the resistivity of the films from their as-grown value of 107 Ω cm. The initial decrease in resistivity with increasing ion dose is due to the loss of hydrogen from the films with a concomitant decrease in…
Gold micropatterns have been generated by the laser photolysis of dimethylgold (III) acetylacetonate, Me2Au(acac), in the vapor phase. Linewidths as fine as 2 μm were readily obtained utilizing a simple optical projection system comprised of a 4× projection lens, a lithographic photomask, and the UV output from an exc…
The first solid-state field-effect transistor has been fabricated utilizing a film of an organic macromolecule, polythiophene, as a semiconductor. The device characteristics have been optimized by controlling the doping levels of the polymer. The device is a normally off type and the source (drain) current can be modu…
In the present scenario for the development of magnetic confinement fusion, the availability of tritium needed to fuel a D-T burning plasma in order to generate 14 MeV neutrons for material and system component testing is not being fully addressed. An alternate approach based on the in situ generation of tritium in a…
Several mechanisms have been proposed for electrical tree initiation in high voltage (HV) transmission and distribution cables. These include fatigue cracking due to Maxwell stress, Joule heating that leads to thermal decomposition, high field induced impact ionization and hot electrons that can break bonds of the pol…
Abstract Triplet lifetimes of cyclic olefins and dienes measured by pulse radiolysis are dependent on the ring size which affects the most stable conformation of the triplet. In the case of cyclic nonconjugated dienes, an intramolecular biradical formation is an important decay process when the reaction is sterically…
The plasticization and forming of birch-bark artifacts is discussed in light of the unique chemical and physical properties of the outer bark of the North American species of white birch, Betula papyrifera Marsh. Preliminary studies have shown that prolonged exposure to organic solvent vapours readily softens and rela…
Abstract In recent years there has been increasing recognition of the importance of melt elasticity in polymer processing. A new instrument has been developed that determines the elastic properties of polymers in the melt state by measuring both the stress relaxation and strain recovery characteristics as a function o…
Abstract Mit Hochtemperaturreaktionen wurde eine neue metastabile Verbindung BaNi 2 In 8 O 15 dargestellt und mit Röntgenbeugungstechniken an Einkristallen untersucht (Raumgruppe D 2h 18 –Cmca; a = 12,2811, b = 11,0214, c = 9,9103 Å; Z = 4). Die entropiestabilisierte Substanz besitzt eine partiell mit In 3+ und Ni 2+…
The dielectric constant and the pyroelectric coefficient at constant stress of 1-lithium hydrogen dimalate 1-Li ⊕ (OOCCHOHCH 2 COOH) ⊖ (HOOCCHOHCH 2 COOH), were investigated in the temperature range 200 ≦ T / K ≦ T d (decomposition temperature) and 100 ≦ T / K ≦ T d , respectively. The compound crystallizes in the spa…
Flammability, thermal, and selected mechanical properties of composites fabricated with epoxy and other thermally stable resin matrices are described. Properties which were measured included limiting-oxygen index, smoke evolu tion, thermal degradation products, total-heat release, heat-release rates, mass loss, flame…
The relatively complex corrosion mechanism of aluminium has been studied by several authors. Corrosion of aluminium occurs only when the metal protective oxide layer is damaged and when the repair mechanism is prevented by chemical dissolution. Polarization methods have been extensively used to investigate the mechani…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text J. Dugas, P. Michel, L. Martin, and J. M. Cariou, "Behavior of the refractive index and of the coefficient of thermal expansion of silicone with temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption sites for water on graphite. 3. Effect of oxidation treatment of sampleKazuhisa Miura and Tetsuo MorimotoCite this: Langmuir 1986, 2, 6, 824–828Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published inissue 1 November 1986…
4-Pyridoxolactone and 5-pyridoxolactone, formed by dehydrogenation of pyridoxal or isopyridoxal during the bacterial degradation of vitamin B6 by Pseudomonas MA-1 and Arthrobacter Cr-7, respectively, are hydrolyzed to the corresponding acids by distinct inducible lactonases which were purified to homogeneity. 4-Pyrido…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVanadium-sensitized photochemistry of heteropoly compounds. Mixed molybdo- and tungstovandatesP. Argitis and E. PapaconstantinouCite this: Inorg. Chem. 1986, 25, 24, 4386–4389Publication Date (Print):November 1, 1986Publication History Published online1 May 2002Published ini…
Abstract Three polymers based upon p ‐hydroxybenzoic acid have been studied by thermogravimetry to ascertain their relative thermal stabilities in both inert and oxidising atmospheres. Experiments have been carried out at a rate of temperature rise of 2°C min −1 and isothermally at a number of temperatures. The polyme…
A new rotary-magnetic refrigerator designed to obtain superfluid helium temperatures by executing a magnetic Carnot cycle is developed. A rotor containing 12 magnetic refrigerants (gadolinium-gallium-garnet) is immersed in liquid helium at 4.2 K and rotated at constant speed in a steady magnetic field distribution. Pe…
Heat transfer in the latent thermal storage unit using form-stable high density polyethylene rods has been numerically analyzed. The analysis is based on simple explicit one-dimensional finite difference equations. The calculation can well simulate both the charge and discharge characteristics of the prototype storage…