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open access

The photosynthetic acclimation of Lolium perenne growing in a free-air CO{sub 2} enrichment (FACE) system

Description: Stands of Ryegrass (Lolium perenne L. cv. Bastion) were grown in the field at ambient or elevated (600{mu}mol/mol) CO{sub 2} concentration, high (560Kg/ha) or low (140Kg/ha) nitrogen addition and with a frequent (every 4 weeks) or infrequent (every 8 weeks) cutting regime. Plants were in the second year of a 3 year experiment. Exposure to elevated CO{sub 2} was carried out with a Free-Air CO{sub 2} Enrichment (FACE) system which provides the most {open_quote}realistic{close_quote} system of CO{… more
Date: November 1, 1994
Creator: Bryant, J. B.
Partner: UNT Libraries Government Documents Department
open access

Study of b{anti b} production in e{sup +}e{sup {minus}} annihilation at {radical}s = 29 GeV with the aid of neural networks

Description: The author presents a measurement of {sigma}(b{anti b})/{sigma}(q{anti q}) in the annihilation process e{sup +}e{sup {minus}} {yields} q{anti q} {yields} hadrons at {radical}s = 29 GeV. The analysis is based on 66 pb{sup {minus}1} of data collected between 1984 and 1986 with the TPC/2{gamma} detector at PEP. To identify bottom events, he uses a neural network with inputs that are computed from the 3-momenta of all of the observed charged hadrons in each event. He also presents a study of bias i… more
Date: November 1, 1994
Creator: Lambert, D. J.
Partner: UNT Libraries Government Documents Department
open access

Structural oxidation state studies of the manganese cluster in the oxygen evolving complex of photosystem II

Description: X-ray absorption spectroscopy (XAS) was performed on Photosystem II (PSII)-enriched membranes prepared from spinach to explore: (1) the correlation between structure and magnetic spin state of the Mn cluster in the oxygen evolving complex (OEC) in the S{sub 2} state; and (2) the oxidation state changes of the Mn cluster in the flash-induced S-states. The structure of the Mn cluster in the S{sub 2} state with the g{approx}4 electron paramagnetic resonance (EPR) signal (S{sub 2}-g4 state) was com… more
Date: November 1, 1994
Creator: Liang, W.
Partner: UNT Libraries Government Documents Department
open access

Three dimensional simulations of space charge dominated heavy ion beams with applications to inertial fusion energy

Description: Heavy ion fusion requires injection, transport and acceleration of high current beams. Detailed simulation of such beams requires fully self-consistent space charge fields and three dimensions. WARP3D, developed for this purpose, is a particle-in-cell plasma simulation code optimized to work within the framework of an accelerator`s lattice of accelerating, focusing, and bending elements. The code has been used to study several test problems and for simulations and design of experiments. Two app… more
Date: November 1, 1994
Creator: Grote, D. P.
Partner: UNT Libraries Government Documents Department
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