33,196 research outputs found
Hybrid Performance of the Pierre Auger Observatory
A key feature of the Pierre Auger Observatory is its hybrid design, in which
ultra high energy cosmic rays are detected simultaneously by fluorescence
telescopes and a ground array. The two techniques see air showers in
complementary ways, providing important cross-checks and measurement
redundancy. Much of the hybrid capability stems from the accurate geometrical
reconstruction it achieves, with accuracy better than either the ground array
detectors or a single telescope could achieve independently. We have studied
the geometrical and longitudinal profile reconstructions of hybrid events. We
present the results for the hybrid performance of the Observatory, including
trigger efficiency, energy and angular resolution, and the efficiency of the
event selection.Comment: Contribution to the 30th International Cosmic Ray Conference, Merida
Mexico, July 200
Gallium phosphide high temperature diodes
High temperature (300 C) diodes for geothermal and other energy applications were developed. A comparison of reverse leakage currents of Si, GaAs, and GaP was made. Diodes made from GaP should be usable to 500 C. A Liquid Phase Epitaxy (LPE) process for producing high quality, grown junction GaP diodes is described. This process uses low vapor pressure Mg as a dopant which allows multiple boat growth in the same LPE run. These LPE wafers were cut into die and metallized to make the diodes. These diodes produce leakage currents below ten to the -9th power A/sq cm at 400 C while exhibiting good high temperature rectification characteristics. High temperature life test data is presented which shows exceptional stability of the V-I characteristics
A General Tank Test of NACA Model 11-C Flying-boat Hull, Including the Effect of Changing the Plan Form of the Step
The results of a general tank test model 11-C, a conventional pointed afterbody type of flying-boat hull, are given in tables and curves. These results are compared with the results of tests on model 11-A, from which model 11-C was derived, and it is found that the resistance of model 11-C is somewhat greater. The effect of changing the plan form of the step on model 11-C is shown from the results of tests made with three swallow-tail and three pointed steps formed by altering the original step of the model. These results show only minor differences from the results obtained with the original model
The use of the plane wave fluid-structure interaction loading approximation in NASTRAN
The Plane Wave Approximation (PWA) is widely used in finite element analysis to implement the loading generated by an underwater shock wave. The method required to implement the PWA in NASTRAN is presented along with example problems. A theoretical background is provided and the limitations of the PWA are discussed
A Complete Tank Test of the Hull of the Sikorsky S-40 Flying Boat - American Clipper Class
The results of a complete test in the N.A.C.A. tank on a model of the hull of Sikorsky S-40 flying boat ('American Clipper') are reported. The test data are given in tables and curves. From these data non-dimensional coefficients are derived for use in take-off calculations and the take-off time and run for the S-40 are computed. The computed take-off time was obtained by the Sikorsky Aviation Corporation in performance tests of the actual craft
- …