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Articles 1381 - 1383 of 1383
Full-Text Articles in Physical Sciences and Mathematics
An Investigation Of Surface Albedo Variations During The Recent Sahel Drought, Carl C. Norton, Frederick R. Mosher, Barry Hinton
An Investigation Of Surface Albedo Variations During The Recent Sahel Drought, Carl C. Norton, Frederick R. Mosher, Barry Hinton
Publications
Applications Technology Satellite (ATS) 3 green sensor data are used to measure surface reflectance variations in the Sahara/Sahel during the recent drought period 1967–74. The magnitude of the seasonal reflectance change is shown to be as much as 80% for years of normal precipitation and less than 50% for drought years. Year-to-year comparisons during both wet and dry seasons reveal the existence of a surface reflectance cycle coincident with the drought intensity. The relationship between the green reflectance and solar albedo is examined and estimated to be about 0.6 times the reflectance change observed by the green channel.
Ca Ii H And K And Hydrogen-Line Variations In V471 Tauri (=Bd + 16°516), Terry D. Oswalt
Ca Ii H And K And Hydrogen-Line Variations In V471 Tauri (=Bd + 16°516), Terry D. Oswalt
Publications
Spectroscopic and narrow-band photoelectric observations of the white dwarf eclipsing binary V471 Tau (= BD + 16°516) are reported. Periodic fluctuations in Ca IIH and K emission and Ha absorption, and a wave-like distortion of the light curve mimic the characteristics of several well-observed RS CVn binaries. A probable correlation between maximum emission-line strength and wave minimum is shown to exist.
A Computerized Demonstration Of The Central Limit Theorem In Statistics, Paul S. T. Lee
A Computerized Demonstration Of The Central Limit Theorem In Statistics, Paul S. T. Lee
Publications
The Central Limit Theorem is one of the most important concepts in statistics. It provides a link between sample statistics and population parameters. It is a basic concept for understanding various hypothesis-testing techniques such as Student's t-distribution, x2-distribution and F-distribution.