G. H. Dunn

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The Great Plains is generally defined as North production is limited by soil water and nutrient availability. Using and supplementing these resources to enhance production without damaging the environment is a major challenge. To meet this challenge, the GPFARM DSS was developed. GPFARM provides crop/livestock management support at the whole farm and ranch(More)
  • M. E. Bannister, G. H. Dunn, Y.-S. Chung, B. Wallbank, K. A. Berrington
  • 1999
Absolute total cross sections for electron-impact excitation of the Be-like C¥ ¦ , N § ¦ and O¨¦ ions have been measured near threshold using the merged electron-ion beams energy-loss (MEIBEL) technique and calculated using a close-coupling R-matrix (CCR) approach. The 2s¥ © S 2s2p © P dipole-allowed transition from the ground state was investigated for all(More)
EXTENDED ABSTRACT In the Great Plains, there has been a recognized need for a systems modeling approach for sustainable agricultural research and development. Central to meeting the challenge of delivering viable decision support software, the USDA-ARS Great Plains Systems Research Unit (GPSRU), in a collaborative effort with Colorado State University(More)
The H3+ molecular ion plays a fundamental role in interstellar chemistry, as it initiates a network of chemical reactions that produce many molecules. In dense interstellar clouds, the H3+ abundance is understood using a simple chemical model, from which observations of H3+ yield valuable estimates of cloud path length, density and temperature. But(More)
Recombination of highly charged ions with electrons is studied by accelerator based merged-beams experiments. In most measurements excessively high recombination rates are observed at low relative energies which cannot be explained by ordinary radiative recombination. The enhanced rates lead to serious losses of ions during the electron cooling process in(More)
Absolute total cross sections for electron-impact excitation of the 2s ¦ S § 2p ¦ P transition in C ¨ © were measured from 7.35 eV to 8.45 eV using the merged electron-ion beams energy-loss technique. The results settle the discrepancy between two previous experiments using the crossed-beams fluorescence method, being in very good agreement with the older(More)
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