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Now showing items 21-40 of 242

A Home Made Double Slab Pyranometer for Irradiance Measurements

Punyasena, M.A.; Jayasuriya, K.D. (Proceedings of the 44th Technical Session of the Sri Lanka Association for the Advancement of Science (SLAAS), 1988)
Thermally Stimulated Current-Voltage Characteristics of Cu2O/CuxS Diode

Kalingamudali, S.R.D.; Siripala, W. (1988)

A simple method was developed to fabricate a p-n junction diode of CU20/CuxS and it Was observed that the stability as well as the current-voltage characteristics of the diode could be improved significantly by controlling ...
A Photoelectrochemical Investigation of n- and p-type semi�conducting behaviour of Copper Oxide Films

Siripala W; Kumara K P (Semiconductor Science and Technology, 1989)

Copper(I) oxide films were prepared on copper substrates by exposing them to solutions containing Cu2+ ions, and it was observed that the photoresponse of these films electrodes in a photoelectrochemical cell is both n- ...
Photovolatic properties of Cu2O/CuxS heterojunction

Siripala W; Kumara K P (Journal of the National Science Council, Sri Lanka, 1990)

A simple electrochemical method was developed to fabricate a Cu2O/CuxS heterojunction and it was then used in preparing a thin film photovoltaic soar cell. Cu2O was prepared by the method of electrodeposition and CuxS was ...
Deuteron and Oxygen-17 NMR Studies of Molecular Motion in Methanol-Saturated Nafion Membranes

Chen, R.S.; Jayakody, J.R.P.; Greenbaum, S.G. (MRS Proceedings, 1993)

Deuteron and oxygen-17 NMR linewidth and spin-lattice relaxation measurements in Nafion-117 films containing methanol at ?75% and ?100% saturation are reported. Molecular motion probed by room temperature measurements in ...
A Mössbauer study of ball-milled Co?Fe?Si?B: I: dry milling

Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)

X-ray diffraction and M�ssbauer effect measurements of ball-milled Co?Fe?Si?B material which had first been re-crystallized from amorphous melt-spun ribbon are presented. Fully amorphous powders have been obtained after ...
High pressure studies of hydrated NAFION membranes: Dielectric relaxation and deuteron NMR

McLin, M.G.; Wintersgill, M.C.; Fontanella, J.J.; Chen, R.S.; Jayakody, J.R.P.; Greenbaum, S.G. (Solid State Ionics, 1993)

Audio frequency electrical conductivity/dielectric relaxation and nuclear magnetic resonance studies of NAFION-117 have been carried out at pressures up to 0.3 GPa (3 kbar). For some samples, the electrical conductivity ...
A Mössbauer study of ball-milled Co?Fe?Si?B: II: with surfactants

Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)

The use of a range of organic surface active substances in the ball milling of Co?Fe?Si?B has been studied by X-ray diffraction and M�ssbauer effect measurements. Effects characteristic of superparamagnetic relaxation of ...
Correlation Time for Polymer Chain Motion Near the Glass Transition in Nitrocellulose.

Jayakody, J.R.P.; Bulusu, S.; Marino, R.A. (MRS Proceedings, 1993)

The NMR chemical shift anisotropy (CSA) has a temperature dependence as a result of thermal motions of the NMR site. For slow motions of a polymer chain at or near the glass transition, Tg, the CSA begins to decrease, with ...
Studies of Water in Nafion Membranes: Using Deuteron and Oxygen?17 Nuclear Magnetic Resonance, and Dielectric Relaxation Techniques

Chen, R.S.; Jayakody, J.R.P.; Greenbaum, S.G.; Pak, Y.S.; Xu, G.; McLin, M.G.; Fontanella, J.J. (Journal of Electrochemical Society, 1993)

Deuteron and oxygen-17 nuclear magnetic resonance measurements and dielectric relaxation studies of Nafion-117 membranes with variable water content (approximately 5-18% by weight) have been carried out. Glassy behavior ...
Band Edge Shifts of p-type Copper Indium Diselenide Electrodes in Aqueous Electrolytes

Siripala W; Vedel, J.; Lincot, D.; Cahen, D. (Applied Physics Letters, 1993)

Impedance measurements were used to evaluate the relative band edge positions of single crystalp?CuInSe2electrodes in various aqueous electrolytes, by measuring the extrapolated flatband potentials, V fb. We find that V ...
Surfactant assisted ball-milling of barium ferrite

Jayasuriya, K.D.; Wu, E.; Kaczmarek, W.A.; Campbell, S.J. (IEEE Transactions on Magnetics, 1994)

The effects of wet-milling barium ferrite in the presence of cationic or anionic surface active substances have been investigated by X-ray diffraction and Mossbauer spectroscopy measurements. Evidence for superparamagnetic ...
A Mössbauer effect study of barium ferrite ball-milled in air

Jayasuriya, K.D.; Kaczmarek, W.A.; Wu, E.; Campbell, S.J. (Hyperfine Interactions, 1994)

The effects of dry-milling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by X-ray diffraction and M�ssbauer effect measurements. The sizes of the BaFe12O19 particles decrease on ...
Current gain increase in AlGaAs/GaAs heterojunction bipolar transistors using AlGaAs layer overgrowth

Kalingamudali, S.R.D.; Wismayer, A.C.; Woods, R.C.; Roberts, J.S. (Applied Physics Letters, 1994)

Reduction of the surface recombination current components in Npn AlGaAs/GaAs heterojunction bipolar transistors has been achieved by overgrowing the emitter?mesas with an AlGaAs layer approximately 0.5 ?m thick. It was ...
New Li+-ion conductors, Li4 ? 2xTi1 ?xSxO4, based on the Li4TiO4 structure

Dissanayake, M.A.K.L.; Sumathipala, H.H.; West, A.R. (Journal of Materials Chemistry, 1994)

In the system Li4TiO4?Li2SO4, a wide range of solid solutions, Li4 ? 2xSxTi1 ?xO4(0 < x < 0.2) with Li4TiO4 structure is formed. The ionic conductivity increases with x and exhibits a maximum (bulk) value of 8.30 ? 10?6 S ...
Synthesis and properties of a new ? polymorph of Li3CrO4

Dissanayake, M.A.K.L.; Garcia-Martin, S.; Saez-Puche, R.; Sumathipala, H.H.; West, A.R. (Journal of Materials Chemistry, 1994)

?-Li3CrO4, isostructural with ?-Li3PO4, has been synthesized by two routes. Reaction of Li2CO3 and Cr2O3 in a 5 : 1 mole ratio in flowing Ar at 800 �C yields ?-Li3CrO4, with a small amount of Li2O. The Li2CO3, seems to ...
Recombination current reduction in AlGaAs/GaAs heterojunction bipolar transistors with polyimide deposition

Kalingamudali, S.R.D.; Wismayer, A.C.; Woods, R.C. (Solid State Electronics, 1994)

N-p-n AlGaAs/GaAs heterojunction bipolar transistors of various emitter-mesa diameters have been fabricated to examine the effects on the recombination current with polyimide deposition. The recombination current in these ...
Experimental evaluation of separate contributions to ideality factor for the base surface recombination current in heterojunction bipolar transistors

Kalingamudali, S.R.D.; Wismayer, A.C.; Woods, R.C. (Materials Science and Engineering: B, 1994)

In this paper it is shown experimentally, for the first time, that the ideality factor n for the extrinsic base surface recombination current in AlGaAs/GaAs heterojunction bipolar transistors (HBTs) is unity and is bias ...
Novel Li+ Ion Conductors and Mixed Conductors, Li3+xSixCr1-xO4 and a Simple Method for Estimating Li+/e- Transport Numbers.

Sumathipala, H.H.; Dissanayake, M.A.K.L.; West, A.R. (Chem Inform, 1995)

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please ...
New solid electrolytes and mixed conductors: Li3 + xCr1 ? xMxO4: M = Ge, Ti

Dissanayake, M.A.K.L.; Gunawardane, R.P.; Sumathipala, H.H.; West, A.R. (Solid State Ionics, 1995)

New Li+ ion conducting solid solutions with ?-LISICON type structure have been found in the system Li3 + xCr1 ? xGexO4 for 0.35 < x < 0.92. Conductivity increases with x; at x = 0.90, ? (bulk) ? 1.4 ? 10?5 S cm?1 at 27 �C ...

Now showing items 21-40 of 242

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