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1992

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Articles 49831 - 49860 of 52976

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Cavity Resonances In Hermetic Compressors: A Finite Element Approach, S. Akella, N. J. Rao, K. Venkateswarlu, S. A. Sundaresan Jan 1992

Cavity Resonances In Hermetic Compressors: A Finite Element Approach, S. Akella, N. J. Rao, K. Venkateswarlu, S. A. Sundaresan

International Compressor Engineering Conference

No abstract provided.

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The Effect Of Refrigerants On The Lubrication Of Rolling Element Bearings Used In Screw Compressors, F. P. Wardle, B. Jacobson, H. Dolfsma, E. Hoglund, U. Jonsson Jan 1992

The Effect Of Refrigerants On The Lubrication Of Rolling Element Bearings Used In Screw Compressors, F. P. Wardle, B. Jacobson, H. Dolfsma, E. Hoglund, U. Jonsson

International Compressor Engineering Conference

No abstract provided.

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Experimental Investigation Of The Rolling Piston Type Refrigerating Rotary Compressor With R502, H. Zhang, B. Yu, M. Xu Jan 1992

Experimental Investigation Of The Rolling Piston Type Refrigerating Rotary Compressor With R502, H. Zhang, B. Yu, M. Xu

International Compressor Engineering Conference

No abstract provided.

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Using Shot Peening To Multiply The Life Of Compressor Components, J. S. Eckersley, B. Ferrelli Jan 1992

Using Shot Peening To Multiply The Life Of Compressor Components, J. S. Eckersley, B. Ferrelli

International Compressor Engineering Conference

No abstract provided.

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Development Of High Efficiency Dual Cylinder Type Rotary Compressor, K. Saitoh, S. Hagiwara, S. Fujimoto, S. Konishi, F. Minamibata, T. Maekawa Jan 1992

Development Of High Efficiency Dual Cylinder Type Rotary Compressor, K. Saitoh, S. Hagiwara, S. Fujimoto, S. Konishi, F. Minamibata, T. Maekawa

International Compressor Engineering Conference

No abstract provided.

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Calculation Of Optimal Value Of Taper For The Drive Pin Of The Scroll Compressor Crankshaft, D. Boyle Jan 1992

Calculation Of Optimal Value Of Taper For The Drive Pin Of The Scroll Compressor Crankshaft, D. Boyle

International Compressor Engineering Conference

No abstract provided.

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Calculating Model And Experimental Investigation Of Gas Leakage, X. Yuan, Z. Chen, Z. Fan Jan 1992

Calculating Model And Experimental Investigation Of Gas Leakage, X. Yuan, Z. Chen, Z. Fan

International Compressor Engineering Conference

No abstract provided.

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Labyrinth Piston Compressors For Low Temperature, H. Meier Jan 1992

Labyrinth Piston Compressors For Low Temperature, H. Meier

International Compressor Engineering Conference

No abstract provided.

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Design And Calculation An A Miniature High-Pressure Compressor Used In Closed Throttle Refrigerator, Z. Gu, S. Ye, Y. Yu Jan 1992

Design And Calculation An A Miniature High-Pressure Compressor Used In Closed Throttle Refrigerator, Z. Gu, S. Ye, Y. Yu

International Compressor Engineering Conference

No abstract provided.

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Effects Of Port Geometry, Dimensions And Position On The Performance Of A Rotary Compressor, A. B. Tramschek, K. T. Ooi Jan 1992

Effects Of Port Geometry, Dimensions And Position On The Performance Of A Rotary Compressor, A. B. Tramschek, K. T. Ooi

International Compressor Engineering Conference

No abstract provided.

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Icons Of Experience, Michael E. Chambers Jan 1992

Icons Of Experience, Michael E. Chambers

Electronic Theses and Dissertations

No abstract provided.

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Comparative Pharmacology-Toxicology Of Cocaethylene And Cocaine/ By Yili Wang, Yili Wang Jan 1992

Comparative Pharmacology-Toxicology Of Cocaethylene And Cocaine/ By Yili Wang, Yili Wang

Electronic Theses and Dissertations

No abstract provided.

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Cycle Performance And Heat Transfer Characteristics Of A Heat Pump Using R22/R142b Refrigerant Mixtures, T. S. Kim, J. Y. Shin, S. D. Chang, M. S. Kim, S. T. Ro Jan 1992

Cycle Performance And Heat Transfer Characteristics Of A Heat Pump Using R22/R142b Refrigerant Mixtures, T. S. Kim, J. Y. Shin, S. D. Chang, M. S. Kim, S. T. Ro

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Performance And Reliability Degradation Of A Residential Unitary Air Conditioning System Resulting From A Mismatch Of A 1992 Air Conditioning Unit With A 15-20 Year Old Evaporator, C. Heflin, F. Keller Jan 1992

Performance And Reliability Degradation Of A Residential Unitary Air Conditioning System Resulting From A Mismatch Of A 1992 Air Conditioning Unit With A 15-20 Year Old Evaporator, C. Heflin, F. Keller

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Modelling Adiabatic Capillary Tubes: A Critical Analysis, C. Melo, R. T. S. Ferreira, R. H. Pereira Jan 1992

Modelling Adiabatic Capillary Tubes: A Critical Analysis, C. Melo, R. T. S. Ferreira, R. H. Pereira

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Refrigerant Mixtures As Hcfc-22 Alternatives, M. B. Shiflett, A. Yokozeki, D. B. Bivens Jan 1992

Refrigerant Mixtures As Hcfc-22 Alternatives, M. B. Shiflett, A. Yokozeki, D. B. Bivens

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Pure Refrigerant Condensation On A Single Integral Finned Tube: Vapour Velocity Effects, B. Bella, A. Cavallini, G. A. Longo, L. Rossetto Jan 1992

Pure Refrigerant Condensation On A Single Integral Finned Tube: Vapour Velocity Effects, B. Bella, A. Cavallini, G. A. Longo, L. Rossetto

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Autonomic Distributed Coordinative Control "F-Vpm" For Multiple Air Conditioners With Concurrent Cooling And Heating Operation, J. Okajima, F. Matstuoka, Y. Shibuya Jan 1992

Autonomic Distributed Coordinative Control "F-Vpm" For Multiple Air Conditioners With Concurrent Cooling And Heating Operation, J. Okajima, F. Matstuoka, Y. Shibuya

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Domestic Refrigeraror/Freezer Applications For New Technologies, W. A. Reed Jan 1992

Domestic Refrigeraror/Freezer Applications For New Technologies, W. A. Reed

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Refrigeration Control With Varying Condensing Pressures, R. H. Green, E. A. Technology, O. A. Vinnicombe, G. A. Ibrahim Jan 1992

Refrigeration Control With Varying Condensing Pressures, R. H. Green, E. A. Technology, O. A. Vinnicombe, G. A. Ibrahim

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Lifetime And Reliability Of Small Hermetic Compressors Using A Ternary Blend Hcfc-22/Hfc-152a/Hcfc-L24, P. E. Hansen, L. Finsen Jan 1992

Lifetime And Reliability Of Small Hermetic Compressors Using A Ternary Blend Hcfc-22/Hfc-152a/Hcfc-L24, P. E. Hansen, L. Finsen

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Thermal Diffusivity Measurement Of Refrigerant 22 At Low Pressures Using The Photoacoustic Effect, K. Stephan, J. Biermann Jan 1992

Thermal Diffusivity Measurement Of Refrigerant 22 At Low Pressures Using The Photoacoustic Effect, K. Stephan, J. Biermann

International Refrigeration and Air Conditioning Conference

No abstract provided.

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R134a In Small Commercial Refrigeration System: Some Practical Aspects, K. D. Gerdsmeyer Jan 1992

R134a In Small Commercial Refrigeration System: Some Practical Aspects, K. D. Gerdsmeyer

International Refrigeration and Air Conditioning Conference

No abstract provided.

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Oxygen Radicals In Ulcerative Colitis, Charles F. Babbs Jan 1992

Oxygen Radicals In Ulcerative Colitis, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Publications

This article reviews the pathophysiologic concept that superoxide and hydrogen peroxide, generated by activated leukocytes, together with low-molecular-weight chelate iron derived from fecal sources and from denatured hemoglobin, amplify the inflammatory response and subsequent mucosal damage in patients with active episodes of ulcerative colitis. The putative pathogenic mechanisms reviewed are as follows: ( l ) Dietary iron is concentrated in fecal material owing to normally limited iron absorption. (2) Mucosal bleeding, characteristic of ulcerative colitis, as well as supplemental oral iron therapy for chronic anemia, further conspire to maintain or elevate mucosal iron concentration in colitis. (3) Fenton chemistry, driven …

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Histochemical Demonstration Of Endothelial Superoxide And Hydrogen Peroxide Generation In Ischemic And Reoxygenated Rat Tissues, Charles F. Babbs, Meloney D. Cregor, Stephen F. Badylak Jan 1992

Histochemical Demonstration Of Endothelial Superoxide And Hydrogen Peroxide Generation In Ischemic And Reoxygenated Rat Tissues, Charles F. Babbs, Meloney D. Cregor, Stephen F. Badylak

Weldon School of Biomedical Engineering Faculty Publications

Objective: The aims were to test and evaluate two novel and independent histochemical methods for detecting the initial postischemic burst of superoxide and hydrogen peroxide in buffer perfused rat tissues during reflow after 60 min warm ischemia. Methods: The first is a high manganese/diaminobenzidine technique, in which superoxide oxidises Mn2+ to Mn3+, which in turn oxidizes diaminobenzidine to form amber colored polymers, observable by light microscopy. The second is a high iron/diaminobenzidine technique, in which hydrogen peroxide oxidizes diethylenetriaminepenta-acetate chelated Fe2+ to form intermediate species, which in turn oxidize diaminobenzidine similarly to Mn3+. Various isolated organs of the rat were …

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A Computer-Based, Automated, Telephonic System To Monitor Patient Progress In The Home Setting, Umesh H. Patel, Charles F. Babbs Jan 1992

A Computer-Based, Automated, Telephonic System To Monitor Patient Progress In The Home Setting, Umesh H. Patel, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Publications

In this report we describe an automated, telephonic system to monitor the progress of patients convalescing at home. The system includes a computerized central station that is capable of automated voice communication over the telephone, using voice reproduction, and touch-tone recognition. Peripheral hardware in multiple monitored homes need include only a touch-tone telephone, but may also be augmented by inexpensive, rudimentary diagnostic aids, such as a scale for body weight, a thermometer, or a blood pressure cuff and manometer. Current central hardware includes a NeXT computer, a fax modem, and a specialized telecommunications modem developed specifically for voice telecommunication using …

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Evidence Of Changes In Regional Blood Perfusion In Human Intracranial Tumours During Conductive Interstitial Hyperthermia, U H. Patel, Charles F. Babbs, J A. Deford, W M. Bleyer, J A. Marchosky, C J. Moran Jan 1992

Evidence Of Changes In Regional Blood Perfusion In Human Intracranial Tumours During Conductive Interstitial Hyperthermia, U H. Patel, Charles F. Babbs, J A. Deford, W M. Bleyer, J A. Marchosky, C J. Moran

Weldon School of Biomedical Engineering Faculty Publications

Human intracranial tumours were treated using local heat therapy produced by surgically implanted catheters containing local resistive heating elements. Changes in local tumor blood flow were assessed indirectly from an algorithm based on the bioheat transfer equation. The algorithm used the ratio of catheter power to catheter temperature rise to estimate regional blood perfusion. Local heat therapy produced consistent reductions in local apparent perfusion. Changes in apparent regional perfusion occurred in intriguing patterns that gave clues to possible vascular events of therapeutic significance.

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Self‐Consistent Scattering Matrix Calculation Of The Distribution Function In Semiconductor Devices, Mark A. Stettler, Mark S. Lundstrom Jan 1992

Self‐Consistent Scattering Matrix Calculation Of The Distribution Function In Semiconductor Devices, Mark A. Stettler, Mark S. Lundstrom

Department of Electrical and Computer Engineering Faculty Publications

The scattering matrix approach is a new technique for solving the Boltzmann equation in devices. We report a self-consistent application of the technique to realistic silicon devices exhibiting strong nonlocal effects. Simulation of a hot-electron, n-i-n diode demonstrates that the new technique efficiently and accurately reproduces Monte Carlo results without the statistical noise, allowing much tighter convergence with Poisson’s equation.

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Minority Hole Mobility In N+ Gaas, Michael L. Lovejoy, Michael R. Melloch, Mark S. Lundstrom, R. K. Ahrenkiel Jan 1992

Minority Hole Mobility In N+ Gaas, Michael L. Lovejoy, Michael R. Melloch, Mark S. Lundstrom, R. K. Ahrenkiel

Department of Electrical and Computer Engineering Faculty Publications

The minority hole diffusivity, or equivalently the hole mobility, was measured in n+GaAs with the zero‐field time‐of‐flight technique. The minority hole mobility was measured for the donor doping range of 1.3×1017 cm−3 to 1.8×1018 cm−3 and was found to vary from 235 to 295 cm2/V s. At the lower doping level, the minority hole mobility is comparable to the corresponding majority hole mobility, but at 1.8×1018 cm−3 the minority hole mobility was 30% higher than the majority carrier hole mobility. These results have important implications for the design of devices such …

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Microsecond Lifetimes And Low Interface Recombination Velocities In Moderately Doped N-Gaas Thin Films, Gregory Benedict Lush, D. H. Levi, H. F. Macmillan, Michael R. Melloch, Mark S. Lundstrom, R. K. Ahrenkiel Jan 1992

Microsecond Lifetimes And Low Interface Recombination Velocities In Moderately Doped N-Gaas Thin Films, Gregory Benedict Lush, D. H. Levi, H. F. Macmillan, Michael R. Melloch, Mark S. Lundstrom, R. K. Ahrenkiel

Department of Electrical and Computer Engineering Faculty Publications

We have observed lifetimes greater than 1 ps in moderately doped, thin film, n-GaAs/A1a,Gae,As double heterostructure membranes formed by etching away the substrate. We attribute these ultralong lifetimes to enhanced photon recycling caused by the removal of the substrate. Nonradiative recombination in the bulk and at the interfaces is very low; the upper limit of the interface recombination velocity is 25 cm/S.-Such long lifetimes in GaAs doped at N,= 1.3 X 10” cme3 suggest that thin-film solar cells offer a potential option for achieving very high efficiencies.

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