3,197 research outputs found
Water Markets in Georgia: An Overview of Ongoing Sales of Water
This paper addresses considerations of direct relevance for ongoing debate in the state as to whether or not water should be sold "like a commodity". The primary point made in the paper is that water is and has long been bought and sold as a commodity in the state. Thus, in the author's view the ongoing debate is simply out of touch with reality.This paper presents case studies showing that there are currently wholesale and retail water markets in Georgia. Moreover, such markets have benefitted many Georgians. In each case, the market in water was created in response to the need to support economic development and lower customer's costs. These markets are subject to regulatory oversight, serve the interest of rural communities, and work in concert with the object of planning and managing water resources. Working Paper # 2003-00
Anisotropic evolution of D-dimensional FRW spacetime
We examine the time evolution of the D=d+4 dimensional Einstein field
equations subjected to a flat Robertson-Walker metric where the 3D and
higher-dimensional scale factors are allowed to evolve at different rates. We
find the exact solution to these equations for a single fluid component, which
yields two limiting regimes offering the 3D scale factor as a function of the
time. The fluid regime solution closely mimics that described by 4D FRW
cosmology, offering a late-time behavior for the 3D scale factor after becoming
valid in the early universe, and can give rise to a late-time accelerated
expansion driven by vacuum energy. This is shown to be preceded by an earlier
volume regime solution, which offers a very early-time epoch of accelerated
expansion for a radiation-dominated universe for d=1. The time scales
describing these phenomena, including the transition from volume to fluid
regime, are shown to fall within a small fraction of the first second when the
fundamental constants of the theory are aligned with the Planck time. This
model potentially offers a higher-dimensional alternative to scalar-field
inflationary theory and a consistent cosmological theory, yielding a unified
description of early- and late-time accelerated expansions via a 5D spacetime
scenario.Comment: Title changed from "A possible higher-dimensional alternative to
scalar-field inflationary theory". Several new results have been added
including a predicted lower- and upper-bound on the time scales marking the
end of an early-time inflationary epoch and the beginning of an FRW epoch for
d=
Fixed-base simulator investigation of lightweight vehicles for lunar escape to orbit with kinesthetic attitude control and simplified manual guidance
Piloted simulator investigation of lightweight vehicles for emergency lunar escape to orbit with kinesthetic attitude control and simplified manual guidanc
The Mineral Content Of Prairie Grasses Within A Five Mile Radius Of Prairie View College
Of all the plants of the earth the grasses are of the greatest use to the human race. To the grasses belong tie cereals, sugar cane, sorghum, and the bamboos; and, since they furnish the bulk of forage for domestic animals, the grasses are also the basis of animal industry. The grasses furnish the principal breadstuffs of the world and a large part of the food for domestic animals. (8)
In Texas the dominant grass over many of the prairies is curly mesquite (Hilaria Belangeri) (6), a dod-former, similar to Buffalo grass and Bermuda.
It is of interest to consider briefly the calcium and phosphorus contents of various species of herbage in relation to mineral requirements of grazing animals. Archibald and Bennett (12) concluded after a review of the literature, that 0.15% of phosphorus in the herbage is the lower limit of safety, below which point the deficiency may seriously lower the value of the pasture for grazing purposes
Application of location theory and empirical data by area industrial development groups
The objective of this paper is to determine if theories of industrial location and empirical data describing changes in manufacturing employment might suggest efficient approaches in attracting industry to a particular area. This is in sharp contrast to the usual application of location theory in which the optimum location of a firm or of a particular industry is selected
Simulator evaluation of displays for a revised takeoff performance monitoring system
Cockpit displays for a Takeoff Performance Monitoring System (TOPMS) to provide pilots with graphic and alphanumeric information pertinent to their decision to continue or abort a takeoff are evaluated. Revised head-down and newly developed head-up displays were implemented on electronic screens in the real-time Transport Systems Research Vehicle (TSRV) Simulator for the Boeing 737 airplane at the Langley Research Center and evaluated by 17 NASA, U.S. Air Force, airline, and industry pilots. Both types of displays were in color, but they were not dependent upon it. The TOPMS head-down display is composed of a runway graphic overlaid with symbolic status and advisory information related to both the expected takeoff point and the predicted stop point (in the event an abort becomes necessary). In addition, an overall Situation Advisory Flag indicates a preferred course of action based on analysis of the various elements of airplane performance and system status. A simpler head-up display conveys most of this same information and relates it to the visual scene. The evaluation pilots found the displays to be credible, easy to monitor, and appropriate for the task. In particular, the pilots said the head-up display was monitored with very little effort and did not obstruct or distract them from monitoring the simulated out-the-window runway scene. This report augments NASA TP-2908, 1989
Development of a simulator for studying simplified lunar escape systems
Design and development of lunar escape system simulator for investigation of lunar escape problems and simplified manual guidance and control for lunar escape vehicle
Description and flight tests of an oculometer
A remote sensing oculometer was successfully operated during flight tests with a NASA experimental Twin Otter aircraft at the Langley Research Center. Although the oculometer was designed primarily for the laboratory, it was able to track the pilot's eye-point-of-regard (lookpoint) consistently and unobtrusively in the flight environment. The instantaneous position of the lookpoint was determined to within approximately 1 deg. Data were recorded on both analog and video tape. The video data consisted of continuous scenes of the aircraft's instrument display and a superimposed white dot (simulating the lookpoint) dwelling on an instrument or moving from instrument to instrument as the pilot monitored the display information during landing approaches
Supersonic aircraft Patent
Design of supersonic aircraft with novel fixed, swept wing planfor
Preliminary flight tests of an oculometer
A remote sensing oculometer has been successfully operated during flight tests. This device was able to track the pilot's eye-point-of-regard (lookpoint) consistently and unobtrusively in the flight environment. The instantaneous position of the lookpoint was determined to within approximately 1 degree. Data were recorded on both analog and video tape. The video data consisted of continuous scenes of the aircraft's instrument display and a superimposed white dot (simulating the lookpoint) dwelling or moving from instrument to instrument as the pilot monitored the display information during landing approaches
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