33,025 research outputs found
Results of the 1983 NASA/JPL balloon flight solar cell calibration program
The 1983 solar cell calibration balloon flight was successfully completed and met all objectives of the program. Thirty-four modules were carried to an altitude of 36.0 kilometers. The calibrated cells can now be used as reference standards in simulator testing of cells and arrays. Cell calibration data are tabulated as well as the repeatability of standard solar cell BFS-17A (35 flights over a 21-year period)
Results of the 1984 NASA/JPL balloon flight solar cell calibration program
The 1984 solar cell calibration balloon flight was successfully completed on July 19, meeting all objectives of the program. Thirty-six modules were carried to an altitude of 36.0 kilometers. The calibrated cells can now be used as reference standards in simulator testing of cells and arrays
Characterization of solar cells for space applications. Volume 4: Electrical characteristics of Spectrolab BSF 200-micron Helios cells as a function of intensity and temperature
Electrical characteristics of Spectrolab BSF 200 micron Helios N/P silicon solar cells are presented in graphical and tabular format as a function of solar illumination intensity and temperature
Characterization of solar cells for space applications. Volume 3: Electrical characteristics of OCLI hybrid MLAR solar cells as a function of intensity and temperature
Electrical characteristics of hybrid multilayer antireflectance coated silicon solar cells are presented in graphical and tabular format as a function of solar illumination intensity and temperature
Characterization of solar cells for space applications. Volume 1: Electrical characteristics of OCLI violet solar cells as a function of intensity and temperature
Electrical characteristics of OCLI violet N/P silicon solar cells are presented in graphical and tabular format as function of solar illumination intensity and temperature
Effective target arrangement in a deterministic scale-free graph
We study the random walk problem on a deterministic scale-free network, in
the presence of a set of static, identical targets; due to the strong
inhomogeneity of the underlying structure the mean first-passage time (MFPT),
meant as a measure of transport efficiency, is expected to depend sensitively
on the position of targets. We consider several spatial arrangements for
targets and we calculate, mainly rigorously, the related MFPT, where the
average is taken over all possible starting points and over all possible paths.
For all the cases studied, the MFPT asymptotically scales like N^{theta}, being
N the volume of the substrate and theta ranging from (1 - log 2/log3), for
central target(s), to 1, for a single peripheral target.Comment: 8 pages, 5 figure
Friedel oscillations in disordered quantum wires: Influence of e-e interactions on the localization length
The Friedel oscillations caused due to an impurity located at one edge of a
disordered interacting quantum wire are calculated numerically. The electron
density in the system's ground state is determined using the DMRG method, and
the Friedel oscillations data is extracted using the density difference between
the case in which the wire is coupled to an impurity and the case where the
impurity is uncoupled. We show that the power law decay of the oscillations
occurring for an interacting clean 1D samples described by Luttinger liquid
theory, is multiplied by an exponential decay term due to the disorder. Scaling
of the average Friedel oscillations by this exponential term collapses the
disordered samples data on the clean results. We show that the length scale
governing the exponential decay may be associated with the Anderson
localization length and thus be used as a convenient way to determine the
dependence of the localization length on disorder and interactions. The
localization length decreases as a function of the interaction strength, in
accordance with previous predictions.Comment: 7 pages, 7 figure
Escape of a Uniform Random Walk from an Interval
We study the first-passage properties of a random walk in the unit interval
in which the length of a single step is uniformly distributed over the finite
range [-a,a]. For a of the order of one, the exit probabilities to each edge of
the interval and the exit time from the interval exhibit anomalous properties
stemming from the change in the minimum number of steps to escape the interval
as a function of the starting point. As a decreases, first-passage properties
approach those of continuum diffusion, but non-diffusive effects remain because
of residual discreteness effectsComment: 8 pages, 8 figures, 2 column revtex4 forma
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