Browsing Faculty Research Publications by Title
Now showing items 1590-1609 of 2106
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Radiation distortions in fast frequency-scanned antenna arrays
(1976)The pattern deterioration that occurs at high scanning speeds in frequency-scanned arrays is studied. Four major effects are observed; these are 1) fall in main beam amplitude, 2) rise in sidelobe level, 3) angular shift ... -
Radiation guiding in a plasma wave wiggler free-electron laser
(1991)The radiation guiding of a plasma wave wiggler free-electron laser (FEL) in the Compton regime was examined. It was found that a Langmuir wave supported by a plasma cylinder acts as a wiggler for the generation of ... -
Radiation hardness of polycrystalline diamond thin films irradiated with 100 MeV I7+ ions
(1997)Polycrystalline diamond thin films grown by hot-filament chemical vapour deposition (CVD) process were irradiated with 100 MeV I7+ ions. The as-deposited and irradiated films were characterized using micro-Raman spectroscopy, ... -
Radiative heat transfer across transparent honeycomb insulation materials.
(1995)A physical model is formulated to evaluate the radiative heat transfer across transparent honeycomb insulation materials. The model takes into account the refraction, reflection, absorption and scattering characteristics ... -
Raman investigation of InSe doped with GaS
(1996)The Raman spectrum of lnSe doped with GaS exhibits appreciable changes at low doping densities indicating considerable changes on introducing GaS. The photoluminescence as well as resonance Raman study shows that the exciton ... -
A raman regime free-electron laser in a partially dielectric-loaded waveguide
(1990)A partially dielectric-loaded waveguide supports modes with phase velocity νph>c/∈1/2, where ∈ is the dielectric constant of the lining. The coupling of a fast mode (with νph>c) with a slow mode (with c /∈1/2<νph<c) via a ... -
Raman scattering in resonance with yellow luminescence transitions in GaN layers grown on sapphire by molecular beam epitaxy
(2000)We have carried out defect-induced Raman scattering in resonance with yellow-luminescence (YL) transitions in GaN layers grown on sapphire by electron cyclotron resonance-molecular beam epitaxy technique. The photoluminescence ... -
Raman scattering line shapes as a probe of the order parameter symmetry in high — Tc superconductors
(1994)We present a microscopic many-body multichannel theory of interference effects between Raman scattering from phonon (discrete) and gap (continuum) pair electronic excitations in a superconductor with dy2−y2 pairing symmetry. ... -
Raman spectroscopy of polycrystalline molybdenum silicide thin films
(1997)Polycrystalline molybdenum disilicide thin films have been prepared by RF magnetron co-sputtering of molybdenum andsilicon onto P-type silicon (100) substrates and annealing thereafter using RTA technique. Raman spectroscopy ... -
Raman, photoluminescence and optical absorption studies on nanocrystalline silicon
(2002)Raman, photoluminescence (PL) and optical absorption results on silicon nanocrystals in SiO2 matrices prepared by RF sputtering method are presented. The samples have varying Si/SiO2 compositional fraction and are annealed ... -
Ranking in quadratic integer programming problems
(1996)The present paper develops an algorithm for ranking the integer feasible solutions of a quadratic integer programming (QIP) problem. A linear integer programming (LIP) problem is constructed which provides bounds on the ... -
Ranking of line outages in an AC-DC system causing overload and voltage problems
(1991)An efficient noniterative method for ranking line outage contingencies in an AC-DC system based on overload and voltage deviation performance indices is developed. The method is based on the calculation of complex line ... -
Rapid performance evaluation of journal bearings
(1997)This paper describes a rapid method for evaluating the significant design parameters such as load capacity, maximum pressure,flow, power loss, and maximum temperature in the oil film. The proposed analytical pressure ... -
Rayleigh–Taylor mode-RF coupling in a dusty plasma
(1999)The growth rate of a gravity or curvature drift driven Rayleigh–Taylor R–T mode in a dusty plasma is adversely affected by the dust particles, through dust charge fluctuations. When a high-power radio wave (rf) is launched ... -
Reactions of hybrid organotellurium ligands 1-(4-methoxyphenyl telluro)-2-[3-(6-methyl-2-pyridyl)propoxy]ethane (L1) and 1-ethylthio-2-[2-thienyltelluro]ethane (L2) with mercury (II) bromide: formation of complexes and their decomposition
(2005)Two tellurium ligands 1-(4-methoxyphenyltelluro)-2-[3-(6-methyl-2-pyridyl)propoxy]ethane (L1) and 1-ethylthio-2-[2-thienyltelluro]ethane (L2) have been synthesized by reacting nucleophiles [4-MeO–C6H4Te−] and [C4H3S-2-Te−] ... -
Reactive power compensation and load balancing in electric power distribution systems
(1998)This article presents a new method for reactive power compensation and load balancing in a four-wire, three-phase distribution system. An IGBT-based PWM voltage source inverter with a dc bus capacitor is used as a compensator. ... -
Reactivity behavior of (hydroxy)diorganotin(IV)methanesulfonates with ionic nucleophiles – synthesis and structural characterization of novel diorganostannate salts, [R2Sn(μ-OH)(OSO2Me)(ONO2)]22Bu4N
(2004)The reaction of R2Sn(OH)OSO2Me [R=n-Pr (1a), or n-Bu (1b)] with one equivalent of Bu4NNO3 in CH2Cl2 proceeds via nucleophilic addition of NO3 − ion to the Lewis acidic tin center and results in the formation of novel ... -
Reactivity ratios and microstructure determination of vinyl acetate-ethy methacrylate copolymers l
(Elsevier Science, 1996)Vinyl acetate ethyl methacrylate (VAc-EMA, V/E) copolymers have been prepared by solution polymerization using benzoyl peroxide as initiator. The composition of the copolymers has been calculated using 1H nuclear magnetic ... -
Reactivity ratios and sequence determination of methacrylonitrile/butyl acrylate copolymers by NMR spectroscopy
(2004)Methacrylonitrile/butyl acrylate (M/B) copolymers were prepared by bulk polymerization using benzoyl peroxide as an initiator. The Distortionless Enhancement by Polarization Transfer spectra were used to differentiate ... -
Ready reserve power determination using artificial neural network
(2004)This paper presents an application of artificial neural network for determination of ready reserve power required under generator outage and increased load conditions in a power system. Gas turbines or hydro plants are ...