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31 results on '"Will, P.M."'

3. The interaction between the Western Indian Ocean and ENSO in CESM

Author

Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Wieners, Claudia E., Dijkstra, Henk A., de Ruijter, Will P.M., Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Wieners, Claudia E., Dijkstra, Henk A., and de Ruijter, Will P.M.

Published
2019

5. The influence of the Indian Ocean on ENSO stability and flavor

Author

Wieners, Claudia E., Dijkstra, Henk A., de Ruijter, Will P.M., Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Sub Physical Oceanography, Dep Natuurkunde, and Marine and Atmospheric Research

Subjects
Atmosphere-ocean interaction, Atmospheric Science, Pacific Ocean, 010504 meteorology & atmospheric sciences, Lag, Tropics, Multivariate ENSO index, 010502 geochemistry & geophysics, 01 natural sciences, Atmosphere, Sea surface temperature, La Niña, Interannual variability, Climatology, Taverne, Common spatial pattern, Upwelling, Environmental science, ENSO, Thermocline, Indian Ocean, 0105 earth and related environmental sciences
Abstract

The effect of long-term trends and interannual, ENSO-driven variability in the Indian Ocean (IO) on the stability and spatial pattern of ENSO is investigated with an intermediate-complexity two-basin model. The Pacific basin is modeled using a fully coupled (i.e., generating its own background state) Zebiak–Cane model. IO sea surface temperature (SST) is represented by a basinwide warming pattern whose strength is constant or varies at a prescribed lag to ENSO. Both basins are coupled through an atmosphere transferring information between them. For the covarying IO SST, a warm IO during the peak of El Niño (La Niña) dampens (destabilizes) ENSO, and a warm IO during the transition from El Niño to La Niña (La Niña to El Niño) shortens (lengthens) the period. The influence of the IO on the spatial pattern of ENSO is small. For constant IO warming, the ENSO cycle is destabilized because stronger easterlies induce more background upwelling, more thermocline steepening, and a stronger Bjerknes feedback. The SST signal at the east coast weakens or reverses sign with respect to the main ENSO signal [i.e., ENSO resembles central Pacific (CP) El Niños]. This is due to a reduced sensitivity of the SST to thermocline variations in case of a shallow background thermocline, as found near the east coast for a warm IO. With these results, the recent increase in CP El Niño can possibly be explained by the substantial IO (and west Pacific) warming over the last decades.

Published
2017

7. The influence of the Indian Ocean on ENSO stability and flavor

Author

Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Wieners, Claudia E., Dijkstra, Henk A., de Ruijter, Will P.M., Sub Physical Oceanography, Dep Natuurkunde, Marine and Atmospheric Research, Wieners, Claudia E., Dijkstra, Henk A., and de Ruijter, Will P.M.

Published
2017

11. An Experimental Laboratory for Pattern Recognition and Signal Processing.

Author

Herbst, N.M. and Will, P.M.

Subjects
*AUTOMATION, *TELEVISION cameras, *PATTERN recognition systems, *IMAGE processing, *HUMAN-machine systems, *ELECTROCARDIOGRAPHY, *SPEECH perception, *SYSTEMS development, *SYSTEMS design, *EQUIPMENT & supplies
Abstract

Discusses an interactive computer-controlled scanning and display system for pattern recognition and signal processing. Components of the system; Description of the system design and programming support; Application to scanner control, optical character recognition and image processing.

Published
1972
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14. The Bruce Protocol-Ramp.

Author

Walter, Will P.M.

Subjects
*EXERCISE tests, *MEDICAL protocols
Abstract

Assesses the implementation of Bruce protocol as standard for graded exercise testing on the treadmill. Details on the formulation of the steady-state protocol; Links between the protocol in the medical exercise testing; Clinical implications of ramp-Bruce protocol; Complexities on the application of the protocol.

Published
2000

18. Exercise testing: Improving performance with a ramped Bruce protocol

Author

Will, P.M. and Walter, J.D.

Abstract

Background The standard Bruce protocol was compared with a ramped Bruce protocol in stress testing of a general population of patients. Methods We examined hemodynamic responses, test duration, and patient comfort with each exercise protocol. Twenty-three patients completed the study, 14 men and 9 women with a mean age of 51 +/- 12 years. Each patient completed the 2 treadmill protocols in a random manner. Results Mean peak heart rate, systolic blood pressure, and rating of perceived exertion according to the revised Borg scale were equivalent in both protocols, measuring 157 +/- 15 beats/min, 170 +/- 22 mm Hg, and 8 +/- 1 for the Bruce and 158 +/- 17 beats/min, 175 +/- 20 mm Hg, and 8 +/- 1 for the ramp protocol (P = NS). Duration of test and metabolic equivalents (METs) were greater with the ramp than with the Bruce protocol. For the Bruce duration and METs were 8:25 +/- 3:00 min and 9.6 +/- 3.1, and for the ramp 10:01 +/- 2:32 min and 11.4 +/- 2.7 (P < .0001 for both). Subjective rating of difficulty was assessed on a scale of 1 to 5, 1 being the most difficult and 5 being the easiest. Rating for the Bruce protocol was 2.5 +/- 0.9 and for the ramp 4.1 +/- 0.9 (P < .0001). Conclusion We propose that a ramped modification of the Bruce protocol achieves equivalent hemodynamic goals but with better duration. Patients preferred the ramp with respect to comfort, and exercise data can be correlated easily with standard protocols. (Am Heart J 1999;138:1033-7.)

Published
1999
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