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Articles 45691 - 45720 of 50081
Full-Text Articles in Entire DC Network
Electrical Modeling Of Pressure Pulsation Dampers, M. Luszczycki
Electrical Modeling Of Pressure Pulsation Dampers, M. Luszczycki
International Compressor Engineering Conference
No abstract provided.
The Effect Of Newer Antiarrhythmic Drugs On Defibrillation Threshold, W A. Tacker, M J. Niebauer, Charles F. Babbs, W J. Combs, B M. Hahn, M A. Barker, J F. Seipel, J D. Bourland, L A. Geddes
The Effect Of Newer Antiarrhythmic Drugs On Defibrillation Threshold, W A. Tacker, M J. Niebauer, Charles F. Babbs, W J. Combs, B M. Hahn, M A. Barker, J F. Seipel, J D. Bourland, L A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
This study was conducted to determine the effects of clofilium phosphate and bretylium tosylate on ventricular defibrillation threshold. Dogs were anesthetized with pentobarbital and subjected to repeated fibrillation-defibrillation episodes. Defibrillation thresholds were determined at 15-min intervals using underdamped 5-6 msec sinusoidal current shocks, from 30 min before drug injection to 120 min after injection. Eight dogs were given clofilium phosphate (0.34 mg/kg, iv). Another 10 dogs were given bretylium tosylate (10.0 mg/kg, iv). Both drugs lowered defibrillation threshold from 15-90 min after injection. The maximum clofilium effect was a 31% decrease in threshold current and a 54% decrease in threshold …
An Animal Model For Testing Automatic Defibrillators, J D. Bourland, Charles F. Babbs, W A. Tacker, L A. Geddes
An Animal Model For Testing Automatic Defibrillators, J D. Bourland, Charles F. Babbs, W A. Tacker, L A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
A promising therapy for ventricular fibrillation--a life-threatening cardiac arrhythmia--is the implantation of an automatic defibrillator. A critical component of such a device is the system that detects the presence of ventricular fibrillation. Automatic systems for detecting ventricular fibrillation have been tested with arrhythmias produced by electric shocks in normal canine hearts, but have not been tested with spontaneous arrhythmias in hyperirritable hearts. We have developed an animal model to create arrhythmias without electrical stimulation and have used it to test our automatic defibrillator. This model permits evaluation of both reliability to diagnose ventricular fibrillation and reliability to reject other tachyarrhythmias.
Dynamic Intraesophageal Imaging Of The Heart With Ultrasound, N. E. Fearnot, Charles F. Babbs, J. D. Bourland, L. A. Geddes
Dynamic Intraesophageal Imaging Of The Heart With Ultrasound, N. E. Fearnot, Charles F. Babbs, J. D. Bourland, L. A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
Real-time images of the heart from within the esophagus are produced by a new intraesophageal ultrasonic sector scanner. Sixty images per second are displayed on a gray scale CRT in real-time and recorded on standard videotape for review. By interactive positioning of the esophageal probe, heart ventricles, atria, and valves can be visualized and their dynamics can be studied. The esophageal probe comprises four 5 MHz PZT-5 piezoelements of 6.35 mm diameter, mounted on a shaft that rotates at 900 rpm. The piezoelements are pulsed at a 5 kHz rate and the echoes are processed electronically.
Salmonella Sp. Harbored By Aquatic Fauna As Indices Of Fecal Pollution, E. V. Morse, K. A. Gossett, R. L. Lawton
Salmonella Sp. Harbored By Aquatic Fauna As Indices Of Fecal Pollution, E. V. Morse, K. A. Gossett, R. L. Lawton
IWRRC Technical Reports Archive
No abstract provided.
Models For Verifiers, Francine Berman
Models For Verifiers, Francine Berman
Department of Computer Science Technical Reports
No abstract provided.
The Power Of Parallelism Automatic Program Synthesis, Carl H. Smith
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
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
Implementing The Mean Value Algorithm For The Solution Of Queueing Network Models, Herb Schwetman
Department of Computer Science Technical Reports
No abstract provided.
A New Technique For Repeated Measurement Of Cardiac Output During Cardiopulmonary Resuscitation, L A. Geddes, Charles F. Babbs
A New Technique For Repeated Measurement Of Cardiac Output During Cardiopulmonary Resuscitation, L A. Geddes, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
We have developed a method for measurement of cardiac output during CPR with ventricular fibrillation. The method avoids the problems encountered when conventional techniques are used under the conditions of very low cardiac output. The method consists of injecting 5% saline as the indicator into the left ventricle and detecting its appearance in the descending aorta by withdrawing blood through an electrically calibrated conductivity cell. The adequacy of indicator mixing has been verified by obtaining dilutions curves simultaneously from the brachial and femoral arteries. Cardiac output can be determined even when output is as low as 7 ml/min/kg during CPR …
Influence Of Adrenergic Drugs Upon Vital Organ Perfusion During Cpr, H R. Holmes, Charles F. Babbs, W D. Voorhees, W A. Tacker, B De Garavilla
Influence Of Adrenergic Drugs Upon Vital Organ Perfusion During Cpr, H R. Holmes, Charles F. Babbs, W D. Voorhees, W A. Tacker, B De Garavilla
Weldon School of Biomedical Engineering Faculty Publications
To determine whether adrenergic drugs administered during cardiopulmonary resuscitation (CPR) alter the distribution of artificial card:l.ac output, we measu"red regional blood flow and cardiac output using radioactive microspheres in 12 dogs. Ventricular fibrillation was induced electrically and CPR was immediately begun with a mechanical chest compressor and ventilator (Thurn per ( R) ) at 60 compressions/min, with a ventilation:compression ratio of 1:5, a compression duration of 0.5 sec, and a ventilation pressure of 20 em H 2 o. Compression force was sufficient to develop 40-50 mmHg peak intraesophageal pressure. After 30 sec of CPR, either 0.9% saline vehicle or 50 …
Dependence Of Defibrillation Threshold Upon Extracellular/Intracellular K+ Concentrations, Charles F. Babbs, S J. Whistler, G Yim, L A. Geddes
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 (Ko) 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 Ko and to the potassium equilibrium potential, EK, 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 Ko and EK required for spontaneous, K+ induced defibrillation (electrical defibrillation …
Dynamic Intraesophageal Imagining Of The Heart With Ultrasound, N E. Fearnot, Charles F. Babbs, J D. Bourland, L A. Geddes
Dynamic Intraesophageal Imagining Of The Heart With Ultrasound, N E. Fearnot, Charles F. Babbs, J D. Bourland, L A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
Real-time images of the heart from within the esophagus are produced by a new intraesophageal ultrasonic sector scanner. Sixty images per second are displayed on a gray scale CRT in real-time and recorded on standard videotape for review. By interactive positioning of the esophageal probe, heart ventricles, atria, and valves can be visualized and their dynamics can be studied. The esophageal probe comprises four 5 MHz PZT-5 piezoelements of 6.35 mm diameter, mounted on a shaft that rotates at 900 rpm. The piezoelements are pulsed at a 5 kHz rate and the echoes are processed electronically.
New Versus Old Theories Of Blood Flow During Cpr, Charles F. Babbs
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
The Development Of Energy Efficient Compressors For Refrigerators And Freezers, R. T. Nelson, M. G. Middleton
International Compressor Engineering Conference
No abstract provided.
Analytical Model Of An Oil-Free Screw Compressor, J. Brablik
Analytical Model Of An Oil-Free Screw Compressor, J. Brablik
International Compressor Engineering Conference
No abstract provided.
The Refrigeration Compressor - The Steps To Maturity, A. B. Newton
The Refrigeration Compressor - The Steps To Maturity, A. B. Newton
International Compressor Engineering Conference
No abstract provided.
Time Resolved Mass Flow Measurement For A Reciprocating Compressor, K. Lee, J. L. Smith
Time Resolved Mass Flow Measurement For A Reciprocating Compressor, K. Lee, J. L. Smith
International Compressor Engineering Conference
No abstract provided.
Simulation Studies, On The Rotary Type Compressor Systems, A. S. Ucer, H. M. Aksel
Simulation Studies, On The Rotary Type Compressor Systems, A. S. Ucer, H. M. Aksel
International Compressor Engineering Conference
No abstract provided.
Requirements To Be Met By A Refrigerant Compressor For Domestic Refrigerating And Freezing Appliances From The Point Of View Of The Users, A. Herrmann
International Compressor Engineering Conference
No abstract provided.
Predicting The Influence Of Internal Mounting Bracket And External Mounting Feed Locations On Sound Radiated From Hermetic Compressor Shells, E. B. Brookbank, L. L. Faulkner
Predicting The Influence Of Internal Mounting Bracket And External Mounting Feed Locations On Sound Radiated From Hermetic Compressor Shells, E. B. Brookbank, L. L. Faulkner
International Compressor Engineering Conference
No abstract provided.
Modelinq Of An Electromagnetic Oscillating Compressor, K. Nishioka, F. J. Friedlaender, W. Soedel
Modelinq Of An Electromagnetic Oscillating Compressor, K. Nishioka, F. J. Friedlaender, W. Soedel
International Compressor Engineering Conference
No abstract provided.
Miniaturization Of Freon Compressor: The Bellows Pump, J. L. Kamm
Miniaturization Of Freon Compressor: The Bellows Pump, J. L. Kamm
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
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.
Eer Improvement On A Reciprocating Hermetic Compressor, F. Peruzzi, V. Bacci, G. Scandurra
Eer Improvement On A Reciprocating Hermetic Compressor, F. Peruzzi, V. Bacci, G. Scandurra
International Compressor Engineering Conference
No abstract provided.
Modeling Of Cylinder Heat Transfer - Large Effort, Little Effect?, S. W. Brok, S. Touber, J. S. Van Der Meer
Modeling Of Cylinder Heat Transfer - Large Effort, Little Effect?, S. W. Brok, S. Touber, J. S. Van Der Meer
International Compressor Engineering Conference
No abstract provided.
Practical Method For Analysis And Estimation Of Reciprocating Hermetic Compressor Performance, K. Suefuji, S. Nakayama
Practical Method For Analysis And Estimation Of Reciprocating Hermetic Compressor Performance, K. Suefuji, S. Nakayama
International Compressor Engineering Conference
No abstract provided.
Optimization Of Compressor Design Including Economic Factors, S. V. Kerr, R. G. Hoare, J. F. T. Maclaren
Optimization Of Compressor Design Including Economic Factors, S. V. Kerr, R. G. Hoare, J. F. T. Maclaren
International Compressor Engineering Conference
No abstract provided.
Investigation Of Non-Lubricated Piston Ring Problems - Cause, Effect And Solution, R.F. M. Tremain
Investigation Of Non-Lubricated Piston Ring Problems - Cause, Effect And Solution, R.F. M. Tremain
International Compressor Engineering Conference
No abstract provided.