4,545 research outputs found
A Derivation Of The Scalar Propagator In A Planar Model In Curved Space
Given that the free massive scalar propagator in 2 + 1 dimensional Euclidean
space is with
we present the counterpart of in curved space with a suitably modified
version of the Antonsen - Bormann method instead of the familiar Schwinger - de
Witt proper time approach, the metric being defined by the rotating solution of
Deser et al. of the Einstein field equations associated with a single massless
spinning particle located at the origin.Comment: 4pages,Presented at FFP10,Nov.24 - 26,2009,UWA,Perth,To appear in AIP
Conference Proceeding
Reworking the Antonsen-Bormann idea
The Antonsen - Bormann idea was originally proposed by these authors for the
computation of the heat kernel in curved space; it was also used by the author
recently with the same objective but for the Lagrangian density for a real
massive scalar field in 2 + 1 dimensional curved space. It is now reworked here
with a different purpose - namely, to determine the zeta function for the said
model using the Schwinger operator expansion.Comment: To appear in Journal of Physics:Conference Series (2012
Summary of GaAs Solar Cell Performance and Radiation Damage Workshop
The workshop considered the GaAs solar cell capability and promise in several steps: (1) maximum efficiency; (2) space application; (3) major technology problems (AR coating optimization, contacts); (4) radiation resistance; (5) cost and availability; and (6) alternatives. The workshop believes that GaAs solar cells are fast approaching the fulfillment of their potential as candidates for space cells. A maximum efficiency of 20 to 31 percent AMO can be reasonably expected from GaAs based cells, and this may go a little higher with concentration. The use of concentration in space needs to be more carefully evaluated
GaAs workshop report
The advantages of GaAs over silicon are discussed. The substrate problem in solar cell fabrication was reviewed. Future trends in solar energy technology were predicted with special emphasis on cost of production
Low energy proton radiation damage to (AlGa)As-GaAs solar cells
Twenty-seven 2 times 2 sq cm (AlGa)As-GaAs solar cells were fabricated and subjected to 50 keV, 100 keV, and 290 keV of proton irradiation along with eighteen high efficiency silicon solar cells. The results of the study further corroborate the advantages for space missions offered by GaAs cells over state of the art silicon cells. Thus, even though the GaAs cells showed greater degradation when irradiated by protons with energy less than 5 MeV, the solar cells were normally protected from these protons by the glass covers used in space arrays. The GaAs cells also offered superior end of life power capability compared with silicon. The change in the open circuit voltage, short circuit current, spectral response, and dark 1-5 characteristics after irradiation at each proton energy and fluence were found to be consistent with the explanation of the effect of the protons. Also dark 1-5 characteristics showed that a new recombination center dominates the current transport mechanism after irradiation
Electron Radiation Damage of (alga) As-gaas Solar Cells
Solar cells (2 cm by 2 cm (AlGa) As-GaAs cells) were fabricated and then subjected to irradiation at normal incidence by electrons. The influence of junction depth and n-type buffer layer doping level on the cell's resistance to radiation damage was investigated. The study shows that (1) a 0.3 micrometer deep junction results in lower damage to the cells than does a 0.5 micrometer junction, and (2) lowering the n buffer layer doping density does not improve the radiation resistance of the cell. Rather, lowering the doping density decreases the solar cell's open circuit voltage. Some preliminary thermal annealing experiments in vacuum were performed on the (AlGa)As-GaAs solar cells damaged by 1-MeV electron irradiation. The results show that cell performance can be expected to partially recover at 200 C with more rapid and complete recovery occurring at higher temperature. For a 0.5hr anneal at 400 C, 90% of the initial power is recovered. The characteristics of the (AlGa)As-GaAs cells both before and after irradiation are described
Medium energy proton radiation damage to (AlGa)As-GaAs solar cells
The performance of (AlGa)As-GaAs solar cells irradiated by medium energy 2, 5, and 10 MeV protons was evaluated. The Si cells without coverglass and a number of GaAs solar cells with 12 mil coverglass were irradiated simultaneously with bare GaAs cells. The cell degradation is directly related to the penetration of depth of protons with GaAs. The influence of periodic and continuous thermal annealing on the GaAs solar cells was investigated
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