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Articles 18841 - 18870 of 19337
Full-Text Articles in Entire DC Network
Optimisation Of Compressor Valve Designs Using The 'Nelder-Mead' Simplex Method , P. C. Shu, A. B. Tramschek
Optimisation Of Compressor Valve Designs Using The 'Nelder-Mead' Simplex Method , P. C. Shu, A. B. Tramschek
International Compressor Engineering Conference
No abstract provided.
Tribology Analysis In Rolling Piston Type Compressor , S. Fujimoto, K. Sakitani, M Watada
Tribology Analysis In Rolling Piston Type Compressor , S. Fujimoto, K. Sakitani, M Watada
International Compressor Engineering Conference
No abstract provided.
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.
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 …
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.
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.
A Digital Reciprocating Compressor Simulation Program Including Suction And Discharge Piping , P. J. Singh
A Digital Reciprocating Compressor Simulation Program Including Suction And Discharge Piping , P. J. Singh
International Compressor Engineering Conference
No abstract provided.
The Importance Of Wall Friction In The Compressible Flow Of Gas Through A Compressor Valve, J. S. Fleming, P. C. Shu, J. Brown
The Importance Of Wall Friction In The Compressible Flow Of Gas Through A Compressor Valve, J. S. Fleming, P. C. Shu, J. Brown
International Compressor Engineering Conference
No abstract provided.
The Study Of Rolling Piston, Rotary Compressor Dynamic Behavior When Stopping To Reduce Noise And Vibration Level , N. Ishii, K. Imaichi, S. Muramatsu, M. Fukushima, H. Matsunaga
The Study Of Rolling Piston, Rotary Compressor Dynamic Behavior When Stopping To Reduce Noise And Vibration Level , N. Ishii, K. Imaichi, S. Muramatsu, M. Fukushima, H. Matsunaga
International Compressor Engineering Conference
No abstract provided.
Basic Practices In Compressors Selection , M. O. Khan
Basic Practices In Compressors Selection , M. O. Khan
International Compressor Engineering Conference
No abstract provided.
Mechanical Loss Model Of Rolling Piston Rotary Compressor With Special Importance Attached To Journal Bearing, S. H. Jorgensen, H. S. Nissen
Mechanical Loss Model Of Rolling Piston Rotary Compressor With Special Importance Attached To Journal Bearing, S. H. Jorgensen, H. S. Nissen
International Compressor Engineering Conference
No abstract provided.
The Prediction Of Frictional Losses In Variable-Speed Rotary Compressors, E. Sakurai, J. F. Hamilton
The Prediction Of Frictional Losses In Variable-Speed Rotary Compressors, E. Sakurai, J. F. Hamilton
International Compressor Engineering Conference
No abstract provided.
Some Approaches Towards A High Efficient Rotary Compressor, K. Sakaino, S. Muramatsu, S. Shida, Ohinata
Some Approaches Towards A High Efficient Rotary Compressor, K. Sakaino, S. Muramatsu, S. Shida, Ohinata
International Compressor Engineering Conference
No abstract provided.
Performance Analysis Of Rolling Piston Type Rotary Compressor For Household Refrigerators, S. Nagatomo, H. Sakata, M. Tago, H. Hattori
Performance Analysis Of Rolling Piston Type Rotary Compressor For Household Refrigerators, S. Nagatomo, H. Sakata, M. Tago, H. Hattori
International Compressor Engineering Conference
No abstract provided.
Characterization Of Solid Contaminants In Air Conditioning And Heat Pump Residential Split Systems And Their Effect On Compressor Reliability, S. G. Sundaresan
Characterization Of Solid Contaminants In Air Conditioning And Heat Pump Residential Split Systems And Their Effect On Compressor Reliability, S. G. Sundaresan
International Compressor Engineering Conference
No abstract provided.
Improvement Of P -V Diagram Measurements, N. Murata, M. Fujitani
Improvement Of P -V Diagram Measurements, N. Murata, M. Fujitani
International Compressor Engineering Conference
No abstract provided.
A Generalized Performance Computer Program For Oil Flooded Twin-Screw Compressors, P. J. Singh, G. C. Patel
A Generalized Performance Computer Program For Oil Flooded Twin-Screw Compressors, P. J. Singh, G. C. Patel
International Compressor Engineering Conference
No abstract provided.
The Dynamic Measurement And Mating Design Of A Screw Compressor Rotor Pair, Z. Xiong
The Dynamic Measurement And Mating Design Of A Screw Compressor Rotor Pair, Z. Xiong
International Compressor Engineering Conference
No abstract provided.
Computer Modeling Of Single -Screw Oil Flooded Refrigerant Compressors, W. W. Boblitt, J. Moore
Computer Modeling Of Single -Screw Oil Flooded Refrigerant Compressors, W. W. Boblitt, J. Moore
International Compressor Engineering Conference
No abstract provided.
Louis Xiv: Patron Of Science And Technology, E. Stewart Saunders
Louis Xiv: Patron Of Science And Technology, E. Stewart Saunders
Libraries Research Publications
Louis XIV during the fifty-five years of his personal reign (1661-1715) created the institutional foundations for the science and technology of France. These institutions were outwardly an attempt both to meet the needs of the French state for technical advice and to provide professional scientists with the necessary support for pure scientific research. In a less obvious sense, the origin and evolution of these institutions represented an attempt on the part of the monarchy to disentangle the pursuit of knowledge from the prevailing system of political patronage and from the political and religious speculation that fed the social conflicts of …
Writing Workshop I, Gardner Mcfall
Theory Z Management And The College Writing Center, James Tackach
Theory Z Management And The College Writing Center, James Tackach
The Writing Center Journal
No abstract provided.