Digital Commons Network^™

Compressor Discharge Line Stress Analysis Utilizing Finite Element Methods, E. Andersen

International Compressor Engineering Conference

No abstract provided.

Electrical Modeling Of Pressure Pulsation Dampers, M. Luszczycki

International Compressor Engineering Conference

No abstract provided.

Models For Verifiers, Francine Berman

Department of Computer Science Technical Reports

No abstract provided.

The Power Of Parallelism Automatic Program Synthesis, Carl H. Smith

Department of Computer Science Technical Reports

No abstract provided.

Is Mathematical Software A Legitimate Research Area?, John R. Rice

Department of Computer Science Technical Reports

No abstract provided.

Implementing The Mean Value Algorithm For The Solution Of Queueing Network Models, Herb Schwetman

Department of Computer Science Technical Reports

No abstract provided.

Dependence Of Defibrillation Threshold Upon Extracellular/Intracellular K+ Concentrations, Charles F. Babbs, S J. Whistler, G Yim, L A. Geddes

Weldon School of Biomedical Engineering Faculty Publications

The effect of increasing extracellular potassium concentration (K_o) upon electrical ventricular defibrillation threshold was investigated in pentobarbital anesthetized dogs treated with intravenous potassium chloride. Defibrillation threshold fell during potassium intoxication. The percent decrease in defibrillation threshold was linearly related to the logarithm of K_o and to the potassium equilibrium potential, E_K, calculated from measured extracellular and intracellular potassium concentrations of ventricular muscle. In dogs supported by left ventricular bypass in order to maintain the circulation during potassium intoxication, the values of K_o and E_K required for spontaneous, K⁺ induced defibrillation (electrical defibrillation …

New Versus Old Theories Of Blood Flow During Cpr, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Publications

Today, the physiology of blood flow during external chest compression appears more complicated than had previously been imagined. New evidence requires that at least two possible mechanisms be considered for generating artificial circulation by external chest compression. The first is the classical mechanism in which the heart propels blood because it is squeezed between the sternum and the spine. The second is a more recently appreciated mechanism in which the entire thorax acts as a pump because of global intrathoracic pressure changes. The first might be called the cardiac pump mechanism and the second might be called the thoracic pump …

Simple Mathematical Models Of The Vibration And Force Transmission Of Discharge Or Suction Tubes As Function Of Discharge And Suction Pressures, W. Soedel

International Compressor Engineering Conference

No abstract provided.

The Development Of Energy Efficient Compressors For Refrigerators And Freezers, R. T. Nelson, M. G. Middleton

International Compressor Engineering Conference

No abstract provided.

The Refrigeration Compressor - The Steps To Maturity, A. B. Newton

International Compressor Engineering Conference

No abstract provided.

Modelinq Of An Electromagnetic Oscillating Compressor, K. Nishioka, F. J. Friedlaender, W. Soedel

International Compressor Engineering Conference

No abstract provided.

Optimum Design Of Reciprocating Compressors To Meet Thermodynamic Criteria , S. V. Kerr, R. G. Hoare, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Lubricant Related Problems With Heat-Pumps, D. W. Hughes, J. T. Mcmullan, K. A. Mawhinney, R. Morgan, B. L. Sutcliffe

International Compressor Engineering Conference

No abstract provided.

Verification Of Flapper Suction-Va1ve Simulation Program, H. Richardson, G. W. Gatecliff, G. C. Griner

International Compressor Engineering Conference

No abstract provided.

Simple Mathematical Models Of Mode Splitting Of Hermetic Compressor Shells That Deviate From Axisymmetry, W. Soedel

International Compressor Engineering Conference

No abstract provided.

Flow Forces And The Tilting Of Spring Loaded Valve Plates - Part I, L. Boswirth

International Compressor Engineering Conference

No abstract provided.

Components On Blade Excited Rigid Body Vibrations Of Rotary Vane Compressors, V. Yee, W. Soedel

International Compressor Engineering Conference

No abstract provided.

The Dynamic Behavior Of Valve Reeds In Reciprocating Gas Compressors - Analytical Study, S. Papastergiou, J. Brown, J. F. T. Maclaren

International Compressor Engineering Conference

No abstract provided.

Performance Of Automatic Compressor Valves, J. Brown, R. Davidson, J. Fleming

International Compressor Engineering Conference

No abstract provided.

Application Of Multispectral Reflectance Studies Of Soils: Pre-Landsat, S. J. Kristof, M. F. Baumgardner, R. A. Weismiller, Shirley Davis

LARS Symposia

It was recognized in the 1960's that measuring the spectral, spatial and temporal variation of electromagnetic fields reflected and emitted from the Earth's surface had many potential applications in the field of agriculture. As a result, computer-implemented pattern recognition techniques were used to analyze multispectral data for the purpose of delineating soil differences. Spectral data were obtained (1) in the laboratory by scanning soil samples with a double-beam spectrophotometer (Beckman DK-2A) and (2) in the field by scanning large areas of soils with an airborne multispectral scanner.

The results obtained through this early research clearly illustrated relationships between the reflected …

Inventory Estimation On The Massively Parallel Processor, Peter D. Argentiero, James P. Strong, David W. Koch

LARS Symposia

This paper describes algorithms for efficiently computing inventory estimates from satellite based images. The algorithms incorporate a one dimensional feature extraction which optimizes the pairwise sum of Fisher distances. Biases are eliminated with a premultiplication by the inverse of the analytically derived error matrix. The technique is demonstrated with a numerical example using statistics obtained from an actual LANDSAT scene.

Attention was given to implementation of the Massively Parallel processor (MPP). A timing analysis demonstrates that the inventory estimation can be performed an order of magnitude faster on the MPP than on a conventional serial machine.

Bulk Processing Techniques For Very Large Areas: Landsat Classification Of California, Willard Newland, David Peterson, Susan Norman

LARS Symposia

The passage of California forestry bill AB452 created a need to assess and analyze multiresource forest data on a statewide basis. The California Department of Forestry (CDF), in responding to part of this need, formed a cooperative effort with Ames Research Center (ARC) and the Jet Propulsion Laboratory (JPL) to prepare a land-cover map of the entire state, emphasizing forest types. This map was produced in less than 1 year, as required, by combining the latest techniques in digital image mosaicking at JPL with the high-speed processing capability available on the ILLIAC IV parallel processor and other computer systems at …

Soil Moisture Sensing With Microwave Radiometers, Thomas Schmugge

LARS Symposia

The large difference between the dielectric constant of water and dry soils produces a strong dependence of the dielectric properties, and thus emissivity, of wet soils on their moisture content in the microwave (50 > X > 1 cm) region of the electromagnetic spectrum. This change in emissivity with soil moisture content can be measured remotely with microwave radiometers. The variation of emissivity with soil moisture is dependent on the wavelength (A) of observation, soil type, surface roughness and vegetative cover. These dependencies are discussed both theoretically and experimentally. Results obtained from aircraft and spacecraft platforms are presented which give a positive …

A Model Of Plant Canopy Polarization Response, V. C. Vanderbllt

LARS Technical Reports

Sensors to remotely measure the linear solarization of ground scenes have been proposed for the Multispectral Resource Sampler (MRS), a satellite sensor system proposed to compliment the Thematic Mapper. At present justification for a Sensor on MRS to measure scene polarization is limited. This paper discusses a model for the amount of linearly polarized light reflected by the shiny leaves of such crops as wheat, corn, and sorghum. The theory demonstrates that, potentially, measurements of the linearly polarized light from a crop canopy may be used as an additional feature to discriminate between crops. Examination of the model suggests that, …

The Preparation Of Land Use, Land Cover, And Prime Agricultural Land Maps For Rappahannock County, Virginia, V. Cheeseman

LARS Symposia

Rural areas are now receiving more attention from planners and natural resource researchers. As existing suburban areas and new towns (including boom towns) spread across the countryside it becomes important to conduct a survey of existing land conditions. The purpose of this research was to supply geographic and statistical data on USDA defined prime farmland in an area undergoing physical development pressures.

A county-wide land use and land cover, and prime farmland inventory was performed in Rappahannock County, Virginia to study agriculturally critical areas. Individual prime farmland soil series were delineated and mapped. The objectives were to measure six characteristics …

Procedure M: A Framework For Stratified Area Estimation, Richard J. Kauth, Richard C. Cicone, William A. Malila

LARS Symposia

This paper describes Procedure M, a systematic approach to processing multispectral scanner data for classification and acreage estimation. A general discussion of the rationale and development of the procedure is given in the context of large-area agricultural applications. Specific examples are given in the form of test results on acreage estimation of spring small grains.

The Methodology Of Ciat's Land Resource Study Of Tropical America, Thomas T. Cochrane

LARS Symposia

CIAT is carrying out an agricultural land resource evaluation of Tropical America to create a base for the effective development and transfer of germplasm oriented technology. The study started in mid-1977 and now covers 850 million ha. It reduces land information to a common base in terms of land systems defined as repetitive patterns of climate, landscape and soils. These are delineated directly onto satellite and side-looking radar imagery. Within land systems, soils are separately described in terms of the major landscape topographical facets.

Once the land resource information is summarized, it is recorded as a computerized data storage, retrieval …

Use Of Landsat Digital Data To Assist In Mapping Soils On Arizona Rangelands, Emil H. Horvath, Donald F. Post, Walter M. Lucas, Richard A. Weismiller

LARS Symposia

The outline and results of more than three years of field and laboratory studies are presented. The work was done in cooperation with the Soil Conservation Service, the Bureau of Land Management, and the Forest Service. Spectral maps generated from Landsat satellite data were used to aid in soil and vegetation surveys of five sites in southeastern Arizona. The sites are rangeland with varied physiography and relief, but generally sparse vegetation. It was found that spectral maps show a very positive correlation with grey tones or color patterns on photographs, and can be an excellent auxiliary tool for locating boundaries …

Change Vector Analysis: An Approach For Detecting Forest Changes With Landsat, William A. Malila

LARS Symposia

Periodic multiresource surveys and effective management of forest resources would be facilitated by capabilities for accurate detection of disturbances and other changes in land cover. Current techniques are not as effective and efficient as desired. This paper describes a recently developed digital method for change detection using multidate Landsat data. The method employs calculation of spectral change vectors from two different dates, prompting its name -- Change Vector Analysis. The concept and a stratification procedure are described and their features are compared to other approaches. An implementation was tested that utilizes a linear transformation of Landsat data channels and spatial-spectral …