10,085 research outputs found
Special studies of AROD system concepts and designs
Signal to noise ratios in airborne range and orbit determination system, and carrier and range loop performance analyse
The development of a solar powered residential heating and cooling system
A solar energy collector design is disclosed that would be efficient for both energy transfer and fluid flow, based upon extensive parametric analyses. Thermal design requirements are generated for the energy storage systems which utilizes sensible heat storage in water. Properly size system components (including the collector and storage) and a practical, efficient total system configuration are determined by means of computer simulation of system performance
Nonlinear competition between asters and stripes in filament-motor-systems
A model for polar filaments interacting via molecular motor complexes is
investigated which exhibits bifurcations to spatial patterns. It is shown that
the homogeneous distribution of filaments, such as actin or microtubules, may
become either unstable with respect to an orientational instability of a finite
wave number or with respect to modulations of the filament density, where long
wavelength modes are amplified as well. Above threshold nonlinear interactions
select either stripe patterns or periodic asters. The existence and stability
ranges of each pattern close to threshold are predicted in terms of a weakly
nonlinear perturbation analysis, which is confirmed by numerical simulations of
the basic model equations. The two relevant parameters determining the
bifurcation scenario of the model can be related to the concentrations of the
active molecular motors and of the filaments respectively, which both could be
easily regulated by the cell.Comment: 13 pages, 7 figure
Observation of Lasing Mediated by Collective Atomic Recoil
We observe the buildup of a frequency-shifted reverse light field in a
unidirectionally pumped high- optical ring cavity serving as a dipole trap
for cold atoms. This effect is enhanced and a steady state is reached, if via
an optical molasses an additional friction force is applied to the atoms. We
observe the displacement of the atoms accelerated by momentum transfer in the
backscattering process and interpret our observations in terms of the
collective atomic recoil laser. Numerical simulations are in good agreement
with the experimental results.Comment: 4 pages, 3 figure
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