60,548 research outputs found
The Ideal and the Real: Southern Plantation Women of the Civil War
Southern plantation women experienced a shift in identity over the course of the Civil War. Through the diaries of Catherine Edmondston and Eliza Fain, historians note the discrepancy between the ideal and real roles women had while the men were off fighting. Unique perspectives and hidden voices in their writings offer valuable insight into the life of plantation women and the hybrid identity they gained despite the Confederate loss
Projections of scan patterns on human retina
Fundus camera tracks eye movements by using camera optics with the aid of an inverted system. Camera provides a flying-spot circular scanning light source in the normal film plane and a broadband photodetector in position normally occupied by light source
Scanning technique for tracking small eye-movements
Scanning technique images spot of blue light on fundus, measures variations in reflectance of spot and compares reflectance pattern with a stored reference pattern. Method then converts the difference from stored pattern into infrared eye motion
Research study of a fundus tracker, phase 2 Final report 18 Jan. 1968 - 1 Feb. 1971
Development of apparatus for studying stabilized image properties of human eye using photomultiplier tube and magnetic core array storage syste
Research study of a fundus tracker for experiments in stabilized vision
Design and operating characteristics of electro-optical instrument for tracking of retinal blood vessels in back of ey
On the use of the approximation in atomic calculations
We demonstrate that approximation is a good starting point for the
configuration interaction calculations for many-electron atoms and ions. is
the total number of electrons in the neutral atom, is the number of valence
electrons. is the self-consistent Hartree Fock potential for a
closed-shell ion with all valence electrons removed. Using of the
approximation considerably simplifies the many-body perturbation theory for the
core-valence correlations. It makes it easier to include higher-order
correlations which often significantly improves the accuracy of the
calculations. Calculations for krypton and barium and their positive ions are
presented for illustration.Comment: 5 pages,1 figure, submitted to Phys. Rev.
Five-Year Response of Spontaneous Vegetation to Removal of Invasive Amur Bush Honeysuckle Along an Urban Creek
Non-native invasive species have major impacts on landscapes worldwide, but their effects in urban areas are not well documented. We quantified the response of naturally regenerating vegetation along an urban creek to removal of the invasive shrub Lonicera maackii (Amur Bush Honeysuckle). Over the 5-year study, species richness more than doubled. Most new plants were native, disturbance-adapted, early successional species. Trend analysis of function traits revealed annuals that rely on seed dispersal by wind or externally on animals were significantly overrepresented among new plants in comparison to their proportion in the countywide species pool. Increased species richness did not result in improved habitat quality, as indicated by Floristic Quality Assessment. Eight new invasive species appeared over the course of the study. Active management of this site may be needed in perpetuit
Velocity vector control system augmented with direct lift control
A pilot-controlled stability control system that employs direct lift control (spoiler control) with elevator control to control the flight path angle of an aircraft is described. A computer on the aircraft generates an elevator control signal and a spoiler control signal, using a pilot-controlled pitch control signal and pitch rate, vertical velocity, roll angle, groundspeed, engine pressure ratio and vertical acceleration signals which are generated on the aircraft. The direct lift control by the aircraft spoilers improves the response of the aircraft flight path angle and provides short term flight path stabilization against environmental disturbances
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