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Articles 5821 - 5850 of 6326
Full-Text Articles in Engineering
Elevation Of Ventricular Defibrillation Threshold In Dogs By Antiarrhythmic Drugs, Charles F. Babbs, Gkw Yim, S J. Whistler, W A. Tacker, L A. Geddes
Elevation Of Ventricular Defibrillation Threshold In Dogs By Antiarrhythmic Drugs, Charles F. Babbs, Gkw Yim, S J. Whistler, W A. Tacker, L A. Geddes
Weldon School of Biomedical Engineering Faculty Publications
Effects of antiarrhythmic drugs upon the threshold delivered energy (TDE) and threshold peak current (TPC) for electrical ventricular defibrillation by damped sinusoidal shocks were investigated in 25 pentobarbital-anesthetized dogs. TDE and TPC were increased by the three antiarrhythmic drugs tested. Bolus injections produced a transient rise, and continuous infusions produced a steady rise in defibrillation threshold. The maximal percent elevations in mean defibrillation threshold during the 60 minutes after intravenous drug treatment in groups of n = 5 dogs were: Treatment % increase in TDE % increase in TPC Lidocaine bolus (3 mg/kg) 48 26 Lidocaine (0.5 mg/Kg/min) 99 45 …
Measurements Of Young's Modulus Of Elasticity Of The Canine Aorta With Ultrasound, D J. Hughes, Charles F. Babbs, L A. Geddes, J D. Bourland
Measurements Of Young's Modulus Of Elasticity Of The Canine Aorta With Ultrasound, D J. Hughes, Charles F. Babbs, L A. Geddes, J D. Bourland
Weldon School of Biomedical Engineering Faculty Publications
We have developed an ultrasonic technique for determining the dynamic Young's modulus of elasticity (E) of the canine aorta in vivo. Young's modulus was measured in the descending thoracic aorta (DTA) and the abdominal aorta (AA) of 12 dogs over a range of mean blood pressures from 40-200 mmHg. The vessels were excised and dynamic moduli were determined in vitro postmortem from pressure-volume curves. The data so obtained were compared to the in vivo values. In vivo and in vitro moduli increased exponentially with mean distending pressure (P). The equation of best fit for these data was of the form …
The Effect Of Laboratory Compaction On The Shear Behavior Of A Highly Plastic Clay After Saturation And Consolidation : Interim Report, James M. Johnson, C. W. Lovell
The Effect Of Laboratory Compaction On The Shear Behavior Of A Highly Plastic Clay After Saturation And Consolidation : Interim Report, James M. Johnson, C. W. Lovell
JTRP Technical Reports
No abstract provided.
Some Effects Of Unwarranted Traffic Signals, Chung-Cha Liu
Some Effects Of Unwarranted Traffic Signals, Chung-Cha Liu
JTRP Technical Reports
No abstract provided.
Amount Of Travel And Fuel Sales Attributable To Out-Of-State Vehicles On Indiana Highways, Kumares C. Sinha
Amount Of Travel And Fuel Sales Attributable To Out-Of-State Vehicles On Indiana Highways, Kumares C. Sinha
JTRP Technical Reports
No abstract provided.
Effects Of Raising Load Limits On Pavements And Bridges In Indiana, Eldon J. Yoder, Benjamin Colucci-Rios, J. John Fraczek, James A. Skees
Effects Of Raising Load Limits On Pavements And Bridges In Indiana, Eldon J. Yoder, Benjamin Colucci-Rios, J. John Fraczek, James A. Skees
JTRP Technical Reports
No abstract provided.
Study Of The Segmental Box Girder Bridge At Turkey Run: Construction, Instrumentation, And Data Collection : Interim Report, Stephen P. Wanders, Douglas Windslow, Charles D. Sutton
Study Of The Segmental Box Girder Bridge At Turkey Run: Construction, Instrumentation, And Data Collection : Interim Report, Stephen P. Wanders, Douglas Windslow, Charles D. Sutton
JTRP Technical Reports
No abstract provided.
Traffic Speed Report No. 110 : Interim Report, Richard Philip Guenthner, George K. Stafford
Traffic Speed Report No. 110 : Interim Report, Richard Philip Guenthner, George K. Stafford
JTRP Technical Reports
No abstract provided.
The Effect Of Compacted Prestress On Compacted Shale Compressibility : Interim Report, Gary Robert Witsman, C. W. Lovell
The Effect Of Compacted Prestress On Compacted Shale Compressibility : Interim Report, Gary Robert Witsman, C. W. Lovell
JTRP Technical Reports
No abstract provided.
Soil Compaction Specification Procedure For Desired Field Strength Response : Interim Report, John Thomas Price
Soil Compaction Specification Procedure For Desired Field Strength Response : Interim Report, John Thomas Price
JTRP Technical Reports
No abstract provided.
Maintenance Methods For Continuously Reinforced Concrete Pavements : Interim Report, Stanley Jay Virkler
Maintenance Methods For Continuously Reinforced Concrete Pavements : Interim Report, Stanley Jay Virkler
JTRP Technical Reports
No abstract provided.
Traffic Speed Report No. 104 : Interim Report, James Robert Mekemson, George K. Stafford
Traffic Speed Report No. 104 : Interim Report, James Robert Mekemson, George K. Stafford
JTRP Technical Reports
No abstract provided.
Mortar Mixtures For Thin, Skid Resistant Concrete Surfaces : Interim Report, Jorge Gomez-Dominguez
Mortar Mixtures For Thin, Skid Resistant Concrete Surfaces : Interim Report, Jorge Gomez-Dominguez
JTRP Technical Reports
No abstract provided.
The Development Of The Computerized Geotechnical Data Bank For The State Of Indiana : Interim Report, Gary Dana Goldberg
The Development Of The Computerized Geotechnical Data Bank For The State Of Indiana : Interim Report, Gary Dana Goldberg
JTRP Technical Reports
No abstract provided.
Treatment Of Sanitary Wastes At Interstate Rest Areas, Phase 3 : Interim Report, James E. Etzel
Treatment Of Sanitary Wastes At Interstate Rest Areas, Phase 3 : Interim Report, James E. Etzel
JTRP Technical Reports
No abstract provided.
Application And Field Evaluation Of Very Thin Skid Resistant Pavement Surfaces : Interim Report, Ryan R. Forrestel
Application And Field Evaluation Of Very Thin Skid Resistant Pavement Surfaces : Interim Report, Ryan R. Forrestel
JTRP Technical Reports
No abstract provided.
Effect Of Binder Characteristics On Tensile Properties Of Bituminous Mixtures, Narendra Prakash Khosla
Effect Of Binder Characteristics On Tensile Properties Of Bituminous Mixtures, Narendra Prakash Khosla
JTRP Technical Reports
No abstract provided.
Field Evaluation Of A Nuclear Density Gauge For Evaluating Concrete Consolidation, Phase 2, Charles F. Scholer, Wayne P. Schumm
Field Evaluation Of A Nuclear Density Gauge For Evaluating Concrete Consolidation, Phase 2, Charles F. Scholer, Wayne P. Schumm
JTRP Technical Reports
No abstract provided.
A Laboratory Investigation Of Cold-Mix Recycled Bituminous Pavements : Interim Report, Mang Tia
A Laboratory Investigation Of Cold-Mix Recycled Bituminous Pavements : Interim Report, Mang Tia
JTRP Technical Reports
No abstract provided.
Correlation Between Pore Size Distribution And Freeze Thaw Durability Of Coarse Aggregate In Concrete : Interim Report, Makoto Kaneuji
Correlation Between Pore Size Distribution And Freeze Thaw Durability Of Coarse Aggregate In Concrete : Interim Report, Makoto Kaneuji
JTRP Technical Reports
No abstract provided.
Development Of A System For The Evaluation Of Pavements In Indiana : Interim Report, Satish Mohan
Development Of A System For The Evaluation Of Pavements In Indiana : Interim Report, Satish Mohan
JTRP Technical Reports
No abstract provided.
Traffic Speed Report No. 105 : Interim Report, James Robert Mekemson, George K. Stafford
Traffic Speed Report No. 105 : Interim Report, James Robert Mekemson, George K. Stafford
JTRP Technical Reports
No abstract provided.
A Multidisciplinary Team Study Of High Accident Locations : Interim Report, James R. Ogren
A Multidisciplinary Team Study Of High Accident Locations : Interim Report, James R. Ogren
JTRP Technical Reports
No abstract provided.
Performance Of Buried Flexible Conduits : Interim Report, G. A. Leonards, Robert Edward Stetkar
Performance Of Buried Flexible Conduits : Interim Report, G. A. Leonards, Robert Edward Stetkar
JTRP Technical Reports
No abstract provided.
Framework For The Transferability Of Trip Generation Parameters Of Small Urban Areas In Indiana : Interim Report, Hani S. Mahmassani, Kumares C. Sinha
Framework For The Transferability Of Trip Generation Parameters Of Small Urban Areas In Indiana : Interim Report, Hani S. Mahmassani, Kumares C. Sinha
JTRP Technical Reports
No abstract provided.
Effect Of Pentobarbital Anesthesia On Ventricular Defibrillation Threshold In Dogs, Charles F. Babbs
Effect Of Pentobarbital Anesthesia On Ventricular Defibrillation Threshold In Dogs, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
The effect of pentobarbital anesthesia upon the minimal voltage and current required for electrical ventricular defibrillation (the defibrillation threshold) was investigated in dogs. Threshold current, energy, and charge in five dogs averaged 2 per cent, 13 per cent, and 6 per cent less under surgical levels of pentobarbital anesthesia than thresholds in the same animals in the awake, unanesthetized state. In dogs given sufficient pentobarbital to produce apnea and supported by mechanical ventilation, threshold current, energy, and charge averaged 3 per cent, 17 per cent, and 2 per cent less than comparable awake values. These differences were far from statistically …
Protection Of Ischemic Myocardium By Whole-Body Hypothermia After Coronary Artery Occlusion In Dogs, Dana R. Abendschein, Willis A. Tacker Jr, Charles F. Babbs
Protection Of Ischemic Myocardium By Whole-Body Hypothermia After Coronary Artery Occlusion In Dogs, Dana R. Abendschein, Willis A. Tacker Jr, Charles F. Babbs
Weldon School of Biomedical Engineering Faculty Publications
Anesthetized dogs were cooled to a core body temperature of 26°C or maintained at a body temperature of 37°C during periods of 5 and 10 hours of LAD coronary artery occlusion. Subsequent macroscopic dehydrogenase enzyme mapping showed that ischemic injury was 25 per cent less after 5 hours of coronary occlusion and 20 per cent less after 10 hours of occlusion in hypothermic dogs than in normothermic controls. The heart rate and left ventricular minute work in hypothermic dogs decreased to roughly half the levels measured in normothermic animals, while left ventricular contractility was 10 to 40 per cent lower …
Evaluation Of The Operating Internal Resistance, Inductance, And Capacitance Of Intact Damped Sine Wave Defibrillators, Charles F. Babbs, S J. Whistler
Evaluation Of The Operating Internal Resistance, Inductance, And Capacitance Of Intact Damped Sine Wave Defibrillators, Charles F. Babbs, S J. Whistler
Weldon School of Biomedical Engineering Faculty Publications
A method is developed for determining actual values of circuit elements in a damped sine wave (Lown waveform) defibrillator, solely from measurements of the output, using two or more power resistors and a storage oscilloscope. If a defibrillator containing capacitance, C, inductance, L, and internal resistance, Ri, is discharged into increasing 5- to 100-ohm resistive loads, R, it is shown for underdamped output waveforms that aˆ = Ri/2L + R/2L and cˆ = CRi + CR, where aˆ = /[t2 tan(t1/t2)], cˆ = 2 aˆ /[ 2 aˆ + (/t2)2], t1 = time from onset to peak, and t2 = …
Temporal Stability And Precision Of Ventricular Defibrillation Threshold Data, Charles F. Babbs, S J. Whistler, G Yim
Temporal Stability And Precision Of Ventricular Defibrillation Threshold Data, Charles F. Babbs, S J. Whistler, G Yim
Weldon School of Biomedical Engineering Faculty Publications
Over two-hundred measurements of the minimum damped sinusoidal current and energy for transchest electrical ventricular defibrillation (ventricular defibrillation threshold) were made to determine the stability and precision of threshold data in 15 pentobarbital-anesthetized dogs. Threshold was determined by repeated trials of fibrillation and defibrillation with successive shocks of diminishing current, each 19% less than that of the preceeding shock. The lowest shock intensity that defibrillated was defined as threshold. In three groups of five dogs each, threshold was measured at intervals of 60, 15, and 5 min. over periods of 8, 5, and 1 hr. respectively. Similar results were obtained …
The Relation Between Permeability And Pore Size Distribution Of Compacted Clayey Silts : Interim Report, Ignacio Garcia-Bengochea
The Relation Between Permeability And Pore Size Distribution Of Compacted Clayey Silts : Interim Report, Ignacio Garcia-Bengochea
JTRP Technical Reports
No abstract provided.