Digital Commons Network^™

Comparative Study Of Minority Electron Properties In P+-Gaas Doped With Beryllium And Carbon, Michael L. Lovejoy, Michael R. Melloch, Mark S. Lundstrom, R. K. Ahrenkiel, B. M. Keyes, T. J. De Lyon, J. M. Woodall

Department of Electrical and Computer Engineering Faculty Publications

Minority electron properties in p+‐GaAs doped with beryllium (Be) and with carbon (C) are reported. Measurements of essentially identical responses for structures differing only in dopant element demonstrate that the diffusivity (Dn) and the diffusion lengths (Ln) are the same in p+‐GaAs doped to ∼1019 cm−3 with Be‐ and C‐dopants. Zero‐field time‐of‐flight analysis yields Dn=35 cm2/s and internal quantum efficiency analysis yields Ln=2.4 μm, which implies a lifetime that is approximately at the estimated radiative limit. In addition, the majority Hall mobility was also found to be identical …

Minority Electron Transport In Inp/Ingaas Heterojunction Bipolar Transistors, Paul Dodd, Mark S. Lundstrom

Department of Electrical and Computer Engineering Faculty Publications

Electron transport across the base of InP/InGaAs heterojunction bipolar transistors is examined by Monte Carlo simulation. The base transit times and electron distribution functions are examined as a function of basewidth. Clear ballistic behavior is observed only for extremely thin bases (much less than 100 A). Over the range of basewidths of interest for devices, base transport appears diffusive, but the electrons are very far from thermal equilibrium. The diffusive behavior is shown to arise from the sensitivity of the steady-state carrier population to small amounts of large-angle scattering.

A Study Of Minority Carrier Lifetime Versus Doping Concentration In N‐Type Gaas Grown By Metalorganic Chemical Vapor Deposition, Gregory Benedict Lush, H. F. Macmillan, B. M. Keyes, D. H. Levi, Michael R. Melloch, R. K. Ahrenkiel, Mark S. Lundstrom

Department of Electrical and Computer Engineering Faculty Publications

Time‐resolved photoluminescence decay measurements are used to explore minority carrier recombination in n‐type GaAs grown by metalorganic chemical vapor deposition, and doped with selenium to produce electron concentrations from 1.3×10¹⁷ cm⁻³ to 3.8×10¹⁸ cm⁻³. For electron densities n₀<10¹⁸ cm⁻³, the lifetime is found to be controlled by radiative recombination and photon recycling with no evidence of Shockley–Read–Hall recombination. For higher electron densities, samples show evidence of Shockley–Read–Hall recombination as reflected in the intensity dependence of the photoluminescence decay. Still, we find that radiative recombination and photon recycling are important for …

Some Aspects Of Describing Processes In Sliding Vane Rotary Machines, Z. Gnutek, E. Kalinowski

International Compressor Engineering Conference

No abstract provided.

The Two Stage Compound Screw Low Molecular Weight Gas Compressor, M. Y. Dreksler

International Compressor Engineering Conference

No abstract provided.

A Massively Parallel Mimd Implemented By Simd Hardware?, H. G. Dietz, W E. Cohen

Department of Electrical and Computer Engineering Technical Reports

Both conventional wisdom and engineering practice hold that a massively parallel MIMD machine should be constructed using a large number of independent processors and an asynchronous interconnection network. In this paper, we suggest that it may be beneficial to implement a massively parallel MIMD using microcode on a massively parallel SIMD microengine; the synchronous nature of the system allows much higher performance to be obtained with simpler hardware. The primary disadvantage is simply that the SIMD microengine must serialize execution of different types of instructions - but again the static nature of the machine allows various optimizations that can minimize …

Optimum Combination Of Parameters For High Mechanical Efficiency Of A Scroll Compressor, Noriaki Ishii, Shuichi Yamamoto, Shigeru Muramatsu, Michio Yamamura, Masatoshi Takahashi

International Compressor Engineering Conference

No abstract provided.

Active Control Of Compressor Noise Radiation Using Piezoelectric Actuators, A. R. Masters, S. J. Kim, J. D. D. Jones

International Compressor Engineering Conference

No abstract provided.

Analytical And Experimental Investigation Of A Scroll Compressor Lubrication System, R. T. Drost, J. F. Quesada

International Compressor Engineering Conference

No abstract provided.

Discharge Gas Temperature Control In Reciprocating Hermetic Compressors Modified For R134a/R22 Refrigerants Operation As Substitutes Of Present R12/R502, F. Peruzzi, G. Lampugnani

International Compressor Engineering Conference

No abstract provided.

Application Of Trunk Piston Labyrinth Compressors In Refrigeration And Heat Pump Cycles, L. E. Keller

International Compressor Engineering Conference

No abstract provided.

One Dimensional Non-Steady Flow In Compressor Pipes Simulated By A Modified Inverse Marching Method Of Characteristics, L. Rosa, R. Tosato

International Compressor Engineering Conference

No abstract provided.

Derivation Of A General Relation Governing The Conjugacy Of Scroll Profiles, J. W. Bush, W. P. Beagle

International Compressor Engineering Conference

No abstract provided.

A Technical Note On The Effects Of Suction Chamber And Cell Interaction An The Suction Characteristics Of A Rotary Vane Compressor, A. B. Tramschek, K. T. Ooi

International Compressor Engineering Conference

No abstract provided.

Optimum Circuit Tube Length And Pressure Drop On The Refrigerant Side Of Evaporators, E. Granryd

International Refrigeration and Air Conditioning Conference

No abstract provided.

Decision Making And Uncertainty, Donald G. Davis Jr., E. Stewart Saunders

Libraries Research Publications

In an article intitled, “Epistemological Dead End and Ergonomic Disaster? The North Amercian Collections Inventory Project,” Journal of Academic Librarianship 13 (September 1987): 209-213, David Henige charges that academic libraries are deceiving themselves when they assign a number to a subject collection and claim that this number represents the strength of the collection. Assigning numbers or levels to subject collections is the methodology used by the RLG Conspectus to rate academic collections. This article by Davis and Saunders offers a counter argument, based on subjective probabilities, to justify the RLG procedure.

Willing To Provide But Unable To Support: The Dilemma Of Smaller Depositories In An Electronic Era , Bert Chapman

Libraries Research Publications

The increasing influence of government information in electronic format poses acute problems for smaller depositories facing financial and personnel shortages. These constraints will increase the dependence of smalier depositories on regional depositories and may compel the smaller institutions to reassess the viability of their depository status. This cumulative predicament will make some government information inacces-sibIe to users of smaller depositories.

Recognition of this should be augmented by acceptance of the reality that existing Federal budgetary pressures, coupled with trends toward user fees in other sectors of librarianship, make free and unimpeded access to all government information an unrealistic public policy …

Method For Determining Flexural Property Changes Of Polymeric Materials Upon Accelerated Aging In Refrigerant/Lubricant Mixtures, N. D. T. Rohatgi, H. O. Spauschus

International Refrigeration and Air Conditioning Conference

No abstract provided.

Criteria For Establishing Accurate Vapor Pressure Curves, L. A. Weber

International Refrigeration and Air Conditioning Conference

No abstract provided.

Basic Design Of A Data Bank System Aimed At The Energy -Efficient Utilization And Application Of Heat Pumps And Other Energy Recovery, S. Nowotny

International Refrigeration and Air Conditioning Conference

No abstract provided.

Advances In Non-Vapor-Compression Refrigeration Systems, T. G. Statt

International Refrigeration and Air Conditioning Conference

No abstract provided.

Manual Of Traffic Impact Studies, 3 Volumes: Volume 1 - Final Report, Guidelines For Traffic Analysis Of Developments Along State Highways, Soumya Sekhar Dey, Jon D. Fricker

JTRP Technical Reports

With intensification urban development and dwindling public resources, assessing the impacts of a new development (traffic impact analysis) is becoming an important planning tool for transportation engineers, so that the traffic impacts of new developments can be foreseen and effective mitigating measures can be planned using optimal allocation of the available funds. The study establishes a detailed and standardized methodology for traffic impact analysis. Although the procedure was developed for the Indiana Department of Transportation, it can be used by other transportation agencies as well with little or no modification.

A new methodology for estimating the percentage of pass-by trips …

Announcements

The Writing Center Journal

No abstract provided.

Front Matter

The Writing Center Journal

No abstract provided.

Provocative Revision, Toby Fulwiler

The Writing Center Journal

No abstract provided.

College Culture And The Challenge Of Collaboration, Art Young

The Writing Center Journal

No abstract provided.

"Whispers Of Coming And Going": Lessons From Fannie, Anne Dipardo

The Writing Center Journal

No abstract provided.

Review Of The Writing Center: New Directions, Jeanette Harris

The Writing Center Journal

No abstract provided.

Front Matter

The Writing Center Journal

No abstract provided.

What Do We Talk About When We Talk About Our Metaphors: A Cultural Critique Of Clinic, Lab, And Center, Peter Carino

The Writing Center Journal

No abstract provided.