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Full-Text Articles in Physical Sciences and Mathematics
Measurement Of The Average Solar Neutron Flux And Its Correlation With Solar Activity, Pyung Syk Ro
Measurement Of The Average Solar Neutron Flux And Its Correlation With Solar Activity, Pyung Syk Ro
Physics & Astronomy ETDs
Data from the University of New Mexico High Energy Neutron Detector flown on NASA satellite OSO-VI arc analyzed with the aim of detecting neutrons from the sun. The detector is a proton recoil telescope capable of directional discrimination and responsive to neutrons of energies between 20 and 200 MeV with an effective average efficiency for this analysis of 10-4 and an effective area of 80cm2. The detector was located in a wheel compartment of OSO-VI and scanned the sun once per revolution of the wheel at a rate of 30 rpm. The satellite was launched on August …
Increasing The Efficiency Of A Surface Ionization Mass Spectrometer, Thomas Curtis Adams
Increasing The Efficiency Of A Surface Ionization Mass Spectrometer, Thomas Curtis Adams
Physics & Astronomy ETDs
An Avco surface ionization mass spectrometer (model 90,000) was installed at the Los Alamos Scientific Laboratory in February, 1968. Since that date this machine has been used as a production instrument for the isotopic analysis of uranium and plutonium samples. During 1969, it was realized that a problem inherent in the ionization mechanism of the instrument was degrading the accuracy of results, and that the number of man-hours expended in reducing data had become excessive. As soon as this situation became apparent, corrective action was initiated to reduce the effect of the ionization problem and to decrease the amount of …
Intensity Ratios For Polarized Refracted Light Near The Critical Angle., Stephanie Layne Moore
Intensity Ratios For Polarized Refracted Light Near The Critical Angle., Stephanie Layne Moore
Physics & Astronomy ETDs
It was undertaken to investigate the intensity ratio of refracted light polarized parallel and perpendicular to the plane of incidence. The primary object of the experiment was to obtain this ratio for light incident at very nearly the critical angle on a water-air interface, the light having first passed through the water. A laser was used to produce the light beam and the experimental results were compared with the theory propounded by Fresnel for infinite plane waves and elsewhere asserted to hold for bound plane waves. As this theory predicted a ratio of the square of the refractive index (n) …
Linear Pulsation Analysis Of Cluster Cepheid Variables, Charles E. Needham
Linear Pulsation Analysis Of Cluster Cepheid Variables, Charles E. Needham
Physics & Astronomy ETDs
Models for thirteen classical Cepheids found in galactic clusters or associations are analyzed. The models are calculated using the most recently published photometric data and theoretical evolutionary tracks. The linearized equations of mass, momentum and energy conservation are solved subject to an infinitesimal radial perturbation of each equilibrium model. The equations are first solved in the adiabatic approximation. This solution is then used as the initial value for the iterative solution of the non-adiabatic equations. The linearized analysis provides information on pulsation periods of fundamental and harmonic modes, stability against pulsations and phase differences between various physical parameters, such as …