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Your search keyword '"Jenkins, David G."' showing total 3 results
Start Over Author "Jenkins, David G." Publication Type Reports
3 results on '"Jenkins, David G."'

1. Towards an Experimental Determination of the Transition Strength Between the Ground States of $^{20}$F and $^{20}$Ne

Author

Kirsebom, Oliver S., Cederkäll, Joakim, Jenkins, David G., Joshi, Pankaj, Julin, Rauno, Kankainen, Anu, Kibédi, Tibor, Tengblad, Olof, and Trzaska, Wladyslaw H.

Subjects
Physics - Instrumentation and Detectors, Astrophysics - Solar and Stellar Astrophysics
Abstract

Electron capture on $^{20}$Ne is thought to play a crucial role in the final evolution of electron-degenerate ONe stellar cores. Recent calculations suggest that the capture process is dominated by the second-forbidden transition between the ground states of $^{20}$Ne and $^{20}$F, making an experimental determination of this transition strength highly desirable. To accomplish this task we are refurbishing an intermediate-image magnetic spectrometer capable of focusing 7 MeV electrons, and designing a scintillator detector surrounded by an active cosmic-ray veto shield, which will serve as an energy-dispersive device at the focal plane., Comment: 4 pages, 1 figure, NIC-XIV

Published
2017
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2. Temporal Aspects of the V[o.sub.2] Response at the Power Output Associated with V[o.sub.2]peak in Well Trained Cyclists-Implications for Interval Training Prescription

Author

Laursen, Paul B., Shing, Cecilia M., and Jenkins, David G.

Abstract

The power output achieved at peak oxygen consumption (V[O.sub.2]peak) and the time this power can be maintained (i.e., Tmax) have been used in prescribing high-intensity interval training. In this context, the present study examined temporal aspects of the V[O.sub.2] response to exercise at the cycling power that output well trained cyclists achieve their V[O.sub.2]peak (i.e., Pmax). Following a progressive exercise test to determine V[O.sub.2]peak, 43 well trained male cyclists (M age = 25 years, SD = 6; M mass = 75 kg, SD = 7; M V[O.sub.2] peak = 64.8 ml x [kg.sup.-1] x [min.sup.-1], SD = 5.2) performed two Tmax tests 1 week apart. Values expressed for each participant are means and standard deviations of these two tests. Participants achieved a mean V[O.sub.2]peak during the Tmax test after 176 s (SD = 40; M = 74% of Tmax, SD = 12) and maintained it for 66 s (SD = 39; M = 26% of Tmax, SD = 12). Additionally, they obtained mean 95% of V[O.sub.2]peak after 147 s (SD = 31; M = 62% of Tmax, SD = 8) and maintained it for 95 s (SD = 38; M = 38% of Tmax, SD = 8). These results suggest that 60-70% of Tmax is an appropriate exercise duration for a population of well trained cyclists to attain V[O.sub.2]peak during exercise at Pmax. However, due to intraparticipant variability in the temporal aspects of the V[O.sub.2] response to exercise at Pmax, future research is needed to examine whether individual high-intensity interval training programs for well trained endurance athletes might best be prescribed according to an athlete's individual V[O.sub.2] response to exercise at Pmax.

Published
2004

3. Microinvertebrates in CELSS Hydroponic Rhizosphere: Experimental Invasion as a Test of Community Stability and a Test of a Method to Measure Bacterivory

Author

Sager, John, Garland, Jay, and Jenkins, David G

Subjects
Life Sciences (General)
Abstract

This report consists of two separate draft manuscripts, each prepared for submittal to a peer-reviewed journal after Kennedy Space Center (KSC) colleague editorial review and final revision. References for the two papers have been combined in this report. The two manuscripts are: (1) Experimental invasion of aquatic rhizosphere habitat and invertebrate communities, and (2) Lysozyme analysis is neither protistan- or bacteriore-specific.

Published
1996

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