78,717 research outputs found
Design of an atmospheric sounding radiometer for the GOES meteorological satellite system
An advanced version of the visible infrared spin scan radiometer onboard U.S. geostationary operational environmental satellites was developed to add a vertical dimension to the instrument's infrared atmospheric images. Through the addition of twelve selectable narrow band filters and more precise in-flight calibration of the infrared detectors, the VISSR atmospheric sounder (VAS) will provide increased data to help determine the Earth's atmospheric temperature and water vapor distribution. The radiometer design, filter wheel, calibration shutter mechanisms, and their preflight test performance are discussed
Dupin hypersurfaces in Lie sphere geometry
The method of moving frames in Lie sphere geometry has produced significant
results in the classification of Dupin hypersurfaces in spheres. What is the
secret of its effectiveness? The answer emerges in the classification of
nonumbilic isoparametric surfaces in the space form geometries. Using the
method of moving frames, the proof of this classification is an elementary
exercise. The same proof classifies the cyclides of Dupin in M\"obius geometry
and finally in Lie sphere geometry, where all nonumbilic Dupin immersions are
Lie sphere congruent to each other.Comment: To appear in the Shoshichi Kobayashi Memorial Volume of Progress in
Mathematics, Birkhause
Solar engine
A solar engine is disclosed in which a fluid, which is first heated and then cooled, forces a piston outward as the fluid is heated, and then draws the piston inward as the fluid is cooled. The piston is connected to a shaft and produces work as it moves outward and inward. A displacer plate moves between an absorber plate and a cooling plate to form an air space between the displacer and one or the other of these two plates for heating and cooling the fluid. The displacer plate is moved from one plate to the other by the displacer push ring as the piston nears the midpoint of its travel on the outward stroke and again on the inward stroke
Solar heating system
A system is disclosed for using solar energy to heat the interior of a structure. The system utilizes a low cost solar collector to heat a recirculating air mass which then flows through a series of interconnected ducts and passageways without the use of exterior fans or blowers. Heat is transferred from the air mass to the structure's interior and the air mass is then reheated
Separation nut Patent
Contamination free separation nut eliminating combustion products from ambient surroundings generated by squib firin
Keener\u27s Spirit hermeneutics: Reading scripture in the light of Pentecost (Book Review)
A review of Keener, C. S. (2016). Spirit hermeneutics: Reading scripture in the light of Pentecost. Grand Rapids, MI: Wm. B. Eerdmans. 522 pp. ISBN 978080287439
Wilder, Brand, Chester, Osborne, and Seifrid\u27s Perspectives on Our Struggle with Sin: Three Views of Romans 7 (Book Review)
A Review of
Perspectives on Our Struggle with Sin: Three Views of Romans 7, By Terry L. Wilder, Chad Brand, Stephen Chester, Grant R. Osborne, and Mark Seifrid. Nashville, TN: B&H Academic, 2011. 213 pp. $24.99. ISBN 9780805447910
Combined solar collector and energy storage system
A combined solar energy collector, fluid chiller and energy storage system is disclosed. A movable interior insulated panel in a storage tank is positionable flush against the storage tank wall to insulate the tank for energy storage. The movable interior insulated panel is alternately positionable to form a solar collector or fluid chiller through which the fluid flows by natural circulation
Quantum mechanics of a constrained electrically charged particle in the presence of electric currents
We discuss the dynamics of a classical spinless quantum particle carrying
electric charge and constrained to move on a non singular static surface in
ordinary three dimensional space in the presence of arbitrary configurations of
time independent electric currents. Starting from the canonical action in the
embedding space we show that a charged particle with charge couples to a
term linear in , where is the transverse component of the
electromagnetic vector potential and is the mean curvature in the surface.
This term cancels exactly a curvature contribution to the orbital magnetic
moment of the particle. It is shown that particles, independently of the value
of the charge, in addition to the known couplings to the geometry also couple
to the mean curvature in the surface when a Neumann type of constraint is
applied on the transverse fluctuations of the wave function. In contrast to a
Dirrichlet constraint on the transverse fluctuations a Neumann type of
constraint on these degrees of freedom will in general make the equations of
motion non separable. The exceptions are the equations of motion for
electrically neutral particles on surfaces with constant mean curvature. In the
presence of electric currents the equation of motion of a charged particle is
generally non separable independently of the coupling to the geometry and the
boundary constraints.Comment: to appear in Phys.Rev.
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