Adaptive optics in coherent lidar wind measurements: A feasibility study

Laser Doppler radar (lidar) is widely used for remote sensing of wind velocities. Usable wavelengths for the laser are limited by the effects of atmospheric turbulence. An adaptive optical system is proposed to compensate for turbulence effects on signal power. The feasibility of an adaptive system is considered in light of the effects of speckle from the aerosol target. It is concluded that adaptive optics is a promising technique for improving the performance of a 2 micron lidar wind measurement system. The chief technical challenges are a laser that will give the required output and pulse repetition rate, a combined Hartmann sensor and heterodyne detector, and a suitable reconstruction algorithm

Adaptive optics for laser power beaming

It has been proposed to use a high energy pulsed laser to beam power into space for satellites or a lunar base. The effects of atmospheric transmission are critical to such a system. Thermal blooming in the atmosphere can cause the beam to spread rapidly. Atmospheric turbulence can cause beam bending or beam spreading, resulting in the loss of transmitted energy that fails to hit the target receiver

Master of Arts

thesi

A Symbiotic Blepharisma

During the summer of 1946, while studying material taken from Marble Lake in Dickinson County in Northwest Iowa a Blepharisma, apparently containing zoochlorellae, was observed. Kahl (1932) lists no symbiotic Blepharisma, but describes Blepharisma coeruleum which apparently eats only the alga Tetraspora. Kahl also cites Blepharisma tardum and Blepharisma dileptus as having a diet composed primarily of red bacteria. It was thought an interesting problem would be to determine the relationship between the Blepharisma and green alga thought to be zoochlorella

A Peculiar Staining Reaction in Euglena rubra Hardy 1911

During experimental work in which routine temporary stains were applied to various species of Euglena, an unusual reaction was found to occur in Euglena rubra when subjected to Noland\u27s 1928 stain and fixative

Paper Session I-A - Space Shuttle Launch Delays and Lessons Learned for RLV/X-33

The Shuttle Program has experienced numerous launch delays over the 15-year history of launch operations. This paper presents a comprehensive tabulation of those delays along with descriptive data covering launch attempts, system/subsystem involved and a brief discussion of the cause of the each delay. This historical data has been audited against NASA/JSC flight history and current records at KSC. Both number of occurrences and magnitude of each launch delay are summarized in a database format allowing analysis, sorting by system o r Orbiter vehicle and chronological assessment. Trends in launch delays since return to flight and comparisons with expendable launch vehicle data are presented. A special sort is described summarizing the propulsion system delays over the history of the program. This particular analysis has application to the new X-33 / Reusable Launch Vehicle (RLV) Program due to the universal selection of L02/LH2 engines for all RLV designs. Significant lessons learned from these launch delay data are presented for comparison with the optimistic turnaround projections for X-33 and RLV

Gender differences in primary grade level students in tests of visual and auditory memory

The purpose of this study was to discover if gender is a significant factor when determining the auditory and visual memory skills of primary grade level students. The study also sought to determine if boys or girls are more able to recall visual or auditory stimuli. Based on the literature related to the subject of gender and memory, differences between males and females vary depending on the tasks performed. The subjects were taken from first, second and third grade students attending a suburban elementary school in New Jersey. Fifty-two boys and fifty-three girls were subjected to a story on an audio tape then tested to determine their ability to remember the auditory material. Thereafter, forty-six boys and fifty-two girls were exposed to a video tape then tested to determine their ability to remember the material on the video. The tests were separated by gender and graded on a scale from 0 to 9. The mean, median and mode of the boys\u27 auditory tests were determined, as well as the mean, median and mode for the girls\u27 auditory tests. The same statistical procedures were performed for both the boys\u27 and girls\u27 visual tests. A two-way Analysis of Variance was then performed on the scores to ascertain whether a significant difference existed between the boys\u27 scores on the two tests and the girls\u27 scores on the two tests. Although the boys scored higher on both tests than did the girls, no significant difference was found between the overall scores comparing the two tests in the Analysis of Variance