Materials Literature
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The effects of electron radiation and elevated temperature on the matrix dominated, cyclic response of standard T300/934 and a chemically modified T300/934 graphite-epoxy are characterzed. Both materials were subjected to 1.0 x 10 10 rads of 1.0 MeV electron ir radiation, under vacuum, to simulate 30 years in geosynch…
This paper deals with the irradiation effects on the thermal shock resistance Δ = σtk/Eα (σt : tensile strength, k: thermal conductivity, E: Young's modulus, α: thermal expansivity) and the thermal shock fracture toughness ∇=KIck/Eα (KIc : fracture toughness value of mode I) in addition to other mechanical properties…
It is shown that accurate x-ray photoemission spectroscopy values of the valence band offsets ΔEv for Ge/GaAs(110), GaAs/ZnSe(110), and Ge/ZnSe(110) vary linearly with the minimum band-gap difference and obey the simple scaling relation, ΔEv/ΔEg(min)=3/4. This empirical observation is compared with the predictions of…
Thermal conductivity, specific heat capacity and complex dielectric constant of PSN ceramic have been measured from 0.1 K up to 100 K. The thermal conductivity increases after poling of the sample but no influence of an applied electric field on the specific heat and the dielectric constant has been detected. Below 0.…
Abstract The behaviour of electrical conductivity of four ferrite semiconductor systems viz., Li‐Ni, Mn‐Mg, Co‐Zn and Ni‐Zn having different compositions has been studied in the vicinity of magnetic transformation temperature. Contrary to the predictions of an empirical formula (P ARKER 's) all the ferrites under inve…
Abstract A molecular theory for small‐angle neutron scattering from polymer mixtures is reviewed and extended to consider multiphase polymer systems such as block copolymers and their blends with homopolymers. Methods are developed for the isolation of scattering functions for individual components in these blends. Th…
Abstract Thermodynamic information is utilized to study the width of the zinc ferritemagnetite phase field, and to establish the oxygen fugacity in equilibrium with this solid solution. Information is provided for the specification of the phase boundaries and for the particular oxygen fugacity that corresponds to the…
We employ mean field theory to study the phase behaviour of nematics in the presence of arbitrary electric and magnetic fields. A rotationally invariant pseudopotential is used. If the molecules have cylindrical symmetry, the most general situation is equivalent to perpendicular electric and magnetic fields. The numer…
Abstract The influence of diluent composition on the internal structure of porous copolymers of 1,4‐di(methacryloyloxymethyl)naphthalene (1,4‐DMN) and divinylbenzene (DVB) was studied. A set of copolymers containing 0.5 mole fraction of 1,4‐DMN and 0.5 mole fraction of DVB obtained in the presence of various amounts o…
The need for more efficient transformer core materials, due to increased recognition by electric utilities of the costs of system losses, has spurred the development of amorphous alloy usage in power transmission and distribution transformers. Amorphous alloy core fabrication, as it relates to single phase distributio…
Summary. The relationship between environmental archaeology and diatom analysis, a well established technique in palaeoecology, is explored. The development of diatom analysis for palaeoenvironmental reconstruction is briefly considered and flow diagrams are presented to illustrate laboratory techniques. Examples of r…
Surface Raman scattering (SRS) by electron-hole pairs at metal surfaces has been analysed theoretically and experimentally. Our analysis, performed for a planar surface, predicts for the SRS intensity a broad peak at low temperatures, due to the excitation of e-h pairs by the polariton field penetrating into the metal…
Abstract This study is concerned with some kinetic features of the reaction of n‐butyl isocyanate with poly(vinyl alcohol) without any catalyst and using triethylene diamine as catalyst. The structure of the resulting polymers was determined by means of IR, 1 H‐ and 13 C‐NMR spectroscopy as well as by chemical analysi…
-Measurements has been made of the ignition temperature of three structural metals in bulk form in a pure oxygen environment. Cylindrical specimens 5 mm in diameter and 5 mm high were ignited by a focused cwCOz laser beam in a static oxygen environment at pressures from 0.084 to 6.895 MPa. A two-color pyrometer was de…
Historically, simulations of the blown film process have been carried out only to the freeze line; a point which is often well below the actual frost line for the process. This limitation in previous simulations was discovered to be related to the interaction of the process boundary conditions with the rheological equ…
This paper reports the results of experimental investigations into the chemical shifts of Fe 2p, Ni 2p and N 1s in Ni-Fe alloy and Fe films. Through XPS analysis on Ni-Fe film composition, it is known that the binding energy of Fe 0 2p increases and the satellite around 859 eV shifts toward lower binding energy with a…
The solid solution (${\mathrm{Cd}}_{0.83}$${\mathrm{Pb}}_{0.17}$${)}_{2}$${\mathrm{Nb}}_{2}$${\mathrm{O}}_{7}$ has a ferroelectric transition at 71 K. Dielectric, specific heat, and electrocaloric measurements are reported in the paraelectric phase of this material on multilayer ceramic capacitors which support electr…
Zwischen den Extrema (Cs⊕)4(Hg4)4⊖ und (Cs⊕)4(Hg4)°4e⊖ liegt der Bindungszustand in CsHg, das isolierte, quadratisch-planare Hg4-Cluster enthält. Die Temperaturabhängigkeit des spezifischen elektrischen Widerstands dieser goldbronzenen, extrem luftempfindlichen Verbindung weist sie als Metall aus, so daß die Formulier…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInverse photoemission spectroscopy at the platinum/acetonitrile interface with several redox couplesJiangbo. Ouyang and Allen J. BardCite this: J. Phys. Chem. 1987, 91, 15, 4058–4062Publication Date (Print):July 1, 1987Publication History Published online1 May 2002Published…
The kinetics and mechanisms of the decomposition of C2H2, C2H4, and n-C4H10 on polycrystalline Ni resulting in the carburization of the metal have been studied at 1300 to 1500 K and 10−4–10−1 Pa. Special attention has been given to the reaction-retarding effect of surface-segregated carbon. Simultaneous investigations…