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Articles 44821 - 44850 of 50087
Full-Text Articles in Entire DC Network
Evaluation Of Compressor Valve Stresses By Means Of Copper Electrodeposit Technique , M. Kumasawa, A. Futakawa, K. Saho
Evaluation Of Compressor Valve Stresses By Means Of Copper Electrodeposit Technique , M. Kumasawa, A. Futakawa, K. Saho
International Compressor Engineering Conference
No abstract provided.
High Performance Valve System, D. Chambers, F. Kalivoda
High Performance Valve System, D. Chambers, F. Kalivoda
International Compressor Engineering Conference
No abstract provided.
An Experimental Circulatory Arrest Model In The Rat To Evaluate Calcium Antagonists In Cerebral Resuscitation, Lawrence De Garavilla, Charles F. Babbs, Willis A. Tacker
An Experimental Circulatory Arrest Model In The Rat To Evaluate Calcium Antagonists In Cerebral Resuscitation, Lawrence De Garavilla, Charles F. Babbs, Willis A. Tacker
Weldon School of Biomedical Engineering Faculty Publications
A circulatory arrest model in the rat was developed for use in cerebral and cardiac resuscitation studies. Whole-body ischemia was produced for 8 to 18 minutes by arresting the heart with a cold potassium chloride cardioplegic solution. Following cardiopulmonary resuscitation, minimal, standardized intensive care was provided. As the duration of ischemia was increased from 8 to 18 minutes, survival immediately following resuscitation decreased from 100% to 25%, and survival at 48 hours after ischemia decreased from 80% to 0%. Thirty per cent of the rats recovering from 11 minutes of ischemia suffered motor seizures. Survival and the incidence of motor …
Regional Blood Flow During Cardiopulmonary Resuscitation With Abdominal Counterpulsation In Dogs, William D. Voorhees Iii, Sandra H. Ralston, Charles F. Babbs
Regional Blood Flow During Cardiopulmonary Resuscitation With Abdominal Counterpulsation In Dogs, William D. Voorhees Iii, Sandra H. Ralston, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
The addition of abdominal counterpulsation to standard cardiopulmonary resuscitation (IAC-CPR) during ventricular fibrillation has been shown to improve cardiac output, oxygen uptake, and central arterial blood pressure in dogs. The present study was performed to determine the effect of IAC-CPR on regional blood flow. Regional blood flow was measured with radioactively labeled microspheres during sinus rhythm and during alternate periods of IAC-CPR and standard CPR (STD-CPR) in nine dogs anesthetized with pentobarbital. Blood pressures and oxygen uptake were measured continuously. As in previous studies, diastolic arterial pressure was higher (30.8%) during IAC-CPR than during STD-CPR, as were cardiac output (24.5%) …
Preclinical Studies Of Abdominal Counterpulsation In Cpr, Charles F. Babbs
Preclinical Studies Of Abdominal Counterpulsation In Cpr, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
Abdominal counterpulsation added to standard cardiopulmonary resuscitation improves blood flow in animal models when compared to chest compressions alone. Similar effects can be demonstrated in analog and digital computer models of the circulation. The technique generates both central aortic and central venous pressure pulses, and successful application of the method depends on maximizing the former and minimizing the latter. Proper technique is important in order to generate the largest possible arteriovenous pressure difference.
Abnormal Response Of Tumor Vasculature To Vasoactive Drugs, Rosanna C. Chan, Charles F. Babbs, Richard J. Vetter, Carlton H. Lamar
Abnormal Response Of Tumor Vasculature To Vasoactive Drugs, Rosanna C. Chan, Charles F. Babbs, Richard J. Vetter, Carlton H. Lamar
Weldon School of Biomedical Engineering Faculty Publications
The effects of the vasoconstrictor, phenylephrine, and the vasodilator, hydralazine, on blood flow to tumor were studied and compared to those on blood flow to normal tissues in vivo. Regional blood flow and cardiac output were measured with the use of radioactive microspheres in 150- to 250 g inbred Harlan F344 rats bearing subcutaneous nodules of two types of transplantable carcinoma ("hard" and "soft") with microscopically different vascular patterns. Three groups of rats were treated with hydralazine, saline, or phenylephrine, and regional blood flow was determined at the time of maximum blood pressure response. Results were correlated with quantitative morphometric …
Cardiac, Thoracic, And Abdominal Pump Mechanisms In Cardiopulmonary Resuscitation: Studies In An Electrical Model Of The Circulation, Charles F. Babbs, Christopher Weaver, Sandra H. Ralston, Leslie A. Geddes
Cardiac, Thoracic, And Abdominal Pump Mechanisms In Cardiopulmonary Resuscitation: Studies In An Electrical Model Of The Circulation, Charles F. Babbs, Christopher Weaver, Sandra H. Ralston, Leslie A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
To investigate alternative mechanisms generating artificial circulation during cardiopulmonary resuscitation (CPR), an electrical model of the circulation was developed. Heart and blood vessels were modeled as resistive-capacitive networks; pressures in the chest, abdomen, and vascular compartments as voltages; blood flow as electric current; blood inertia as inductance; and the cardiac and venous valves as diodes. External pressurization of thoracic and abdominal vessels, as would occur in CPR, was simulated by application of half-sinusoidal voltage pulses. Three modes of creating artificial circulation were studied: cardiac pump (CP), in which the atria and ventricles of the model were pressurized simultaneously; thoracic pump …
Intrapulmonary Epinephrine During Prolonged Cardipulmonary Resuscitation: Improved Regional Blood Flow And Resuscitation In Dogs, Sandra H. Ralston, William D. Voorhees, Charles F. Babbs
Intrapulmonary Epinephrine During Prolonged Cardipulmonary Resuscitation: Improved Regional Blood Flow And Resuscitation In Dogs, Sandra H. Ralston, William D. Voorhees, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
Blood flow to vital organs was measured at five-minute intervals during 20 minutes of cardiopulmonary resuscitation (CPR) and ventricular fibrillation in two groups of anesthetized dogs (n = 15 per group). The relationship between organ blood flow and restoration of circulation after 20 minutes was assessed with no additional treatment in Group I and with intrapulmonary epinephrine in Group II. Cardiac output and organ blood flow did not vary significantly in Group I. In Group II, intrapulmonary epinephrine significantly improved blood flow to the myocardium, the brain, and the adrenal glands. A mean myocardial blood flow of less than 0.13 …
Theoretical Advantages Of Abdominal Counterpulsation In Cpr As Demonstrated In A Simple Electrical Model Of The Circulation, Charles F. Babbs, Sandra H. Ralston, Leslie A. Geddes
Theoretical Advantages Of Abdominal Counterpulsation In Cpr As Demonstrated In A Simple Electrical Model Of The Circulation, Charles F. Babbs, Sandra H. Ralston, Leslie A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
Animal studies and preliminary clinical observations suggest that the addition of interposed abdominal compressions (IAC) to ventilation and chest compression of standard cardiopulmonary resuscitation (CPR) augments blood flow, blood pressures, and immediate survival. To investigate the physical basis for enhanced circulation during IAC-CPR, we developed an electrical model of the circulation. Heart and blood vessels were modeled as resistive-capacitive networks, pressures as voltages, blood flow as electric current, blood inertia as inductance, and the cardiac and venous valves as diodes. External pressurization of the heart and great vessels, as would occur in CPR, was simulated by application by half-sinusoidal voltage …
Analysis And Control Of Hermetic Compressor Sound Power Levels, T. Sisson, F. Simpson
Analysis And Control Of Hermetic Compressor Sound Power Levels, T. Sisson, F. Simpson
International Compressor Engineering Conference
No abstract provided.
Compressor Modeling Technique For Realistic And Broad Range Simulation , A. Patani, U. Bonne
Compressor Modeling Technique For Realistic And Broad Range Simulation , A. Patani, U. Bonne
International Compressor Engineering Conference
No abstract provided.
Turbo Boosted Reciprocating Compressors, J. P. Clegg, J. E. Grimmer
Turbo Boosted Reciprocating Compressors, J. P. Clegg, J. E. Grimmer
International Compressor Engineering Conference
No abstract provided.
Efficacy And Safety Of The Reciprocal Pulse Defibrillator Current Waveform, M J. Niebauer, Charles F. Babbs, L A. Geddes, J D. Bourland
Efficacy And Safety Of The Reciprocal Pulse Defibrillator Current Waveform, M J. Niebauer, Charles F. Babbs, L A. Geddes, J D. Bourland
Weldon School of Biomedical Engineering Faculty Publications
The efficacy and safety of a new defibrillating current waveform, consisting of a low-tilt 5 ms trapezoidal pulse followed closely by a second identical pulse of opposite polarity, was tested m seven isolated, perfused, working canine hearts suspended in an isoresistive, isosmotic shock bath at 37 oC. The efficacy and safety of the reciprocal pulse was compared with a single 5 ms pulse, a single 10 ms pulse, and a dual (unidirectional) 5 ms pulse waveform. The mean threshold average current densities for the 5 ms single pulse, 10 ms single pulse, dual 5 ms pulse, and reciprocal pulse (absolute …
An Energy Saving Valve For Refrigeration Equipment Mounting Rotary Compressor , M. Morita, H. Nasu, M. Fujimoto
An Energy Saving Valve For Refrigeration Equipment Mounting Rotary Compressor , M. Morita, H. Nasu, M. Fujimoto
International Compressor Engineering Conference
No abstract provided.
Performance Analysis Of A Sliding -Vane Rotary Compressor For A Household Refrigerator/Freezer, J. D. Tromblee
Performance Analysis Of A Sliding -Vane Rotary Compressor For A Household Refrigerator/Freezer, J. D. Tromblee
International Compressor Engineering Conference
No abstract provided.
Design Of Compressor Suspension Systems Using Modal Analysis, N. Gupta, R. J. Bernhard
Design Of Compressor Suspension Systems Using Modal Analysis, N. Gupta, R. J. Bernhard
International Compressor Engineering Conference
No abstract provided.
A Simulation Model For Fixed Vane Rotary Compressor Using Real Gas Properties , F. Gyberg, H. S. Nissen
A Simulation Model For Fixed Vane Rotary Compressor Using Real Gas Properties , F. Gyberg, H. S. Nissen
International Compressor Engineering Conference
No abstract provided.
Vibration Analysis Of Refrigerant Compressor Shaft, K. Nishioka, T. Inagaki, T. Kannon
Vibration Analysis Of Refrigerant Compressor Shaft, K. Nishioka, T. Inagaki, T. Kannon
International Compressor Engineering Conference
No abstract provided.
Dynamics Of The Swash Plate Mechanism, J. F. Below, D. A. Miloslavich
Dynamics Of The Swash Plate Mechanism, J. F. Below, D. A. Miloslavich
International Compressor Engineering Conference
No abstract provided.
Analysis Of The Effect Of The Compressor Kinematics On The Valve Losses, P. N. Pandeya
Analysis Of The Effect Of The Compressor Kinematics On The Valve Losses, P. N. Pandeya
International Compressor Engineering Conference
No abstract provided.
Over-Reexpansion As A Means Of Compressor Capacity Modulation, K. W. Yun, L. Reese
Over-Reexpansion As A Means Of Compressor Capacity Modulation, K. W. Yun, L. Reese
International Compressor Engineering Conference
No abstract provided.
High Efficiency Compressor-Condenser In A Single Hermetic Component For Heat Pumps , G. Giuffrida
High Efficiency Compressor-Condenser In A Single Hermetic Component For Heat Pumps , G. Giuffrida
International Compressor Engineering Conference
No abstract provided.
Continuous And Discontinuous Capacity Control For High Speed Refrigeration Compressors, H. Holdack-Janssen, H. Kruse
Continuous And Discontinuous Capacity Control For High Speed Refrigeration Compressors, H. Holdack-Janssen, H. Kruse
International Compressor Engineering Conference
No abstract provided.
Heat Transfer Between Gas And Cylinder Wall Of Refrigerating Reciprocating Compressor , R. Liu, Z. Zhou
Heat Transfer Between Gas And Cylinder Wall Of Refrigerating Reciprocating Compressor , R. Liu, Z. Zhou
International Compressor Engineering Conference
No abstract provided.
An Approach To Computer Modelling Of Reciprocating Compressors, S. Lawson, R. J. L. Mclaren
An Approach To Computer Modelling Of Reciprocating Compressors, S. Lawson, R. J. L. Mclaren
International Compressor Engineering Conference
No abstract provided.
Improvements In Reciprocating Compressors - With Special Emphasis On Interesting Developments For Refrigeration In The G.D.R, H. Najork, E. Gunther, L. Kinne, U. Adolph, S. Laute
Improvements In Reciprocating Compressors - With Special Emphasis On Interesting Developments For Refrigeration In The G.D.R, H. Najork, E. Gunther, L. Kinne, U. Adolph, S. Laute
International Compressor Engineering Conference
No abstract provided.
Performance Evaluation By Analog Study Of A Two Stage Reciprocating Compressor Handling Complex Hydrocarbon Gas Mixtures, S. N. Dwivedi
Performance Evaluation By Analog Study Of A Two Stage Reciprocating Compressor Handling Complex Hydrocarbon Gas Mixtures, S. N. Dwivedi
International Compressor Engineering Conference
No abstract provided.
Hydrodynamic Optimization Of The Tribological System Piston-Ring-Liner In Reciprocating Compressors, U. Todsen, H. Kruse
Hydrodynamic Optimization Of The Tribological System Piston-Ring-Liner In Reciprocating Compressors, U. Todsen, H. Kruse
International Compressor Engineering Conference
No abstract provided.
An Application Of Triac To Capacitor Motor For Hermetic Compressor, K. Nakane, Y. Tozaki, H. Sakamoto
An Application Of Triac To Capacitor Motor For Hermetic Compressor, K. Nakane, Y. Tozaki, H. Sakamoto
International Compressor Engineering Conference
No abstract provided.
Improved Suspension System For Reciprocating Hermetic Compressors , V. Bacci, M. Zgliczynski, G. Gili
Improved Suspension System For Reciprocating Hermetic Compressors , V. Bacci, M. Zgliczynski, G. Gili
International Compressor Engineering Conference
No abstract provided.