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Advanced, Environmentally Friendly Hydroelectric Turbines for the Restoration of Fish and Water Quality
Hydroelectric power contributes about 10 percent of the electrical energy generated in the United States, and nearly 20 percent of the world�s electrical energy. The contribution of hydroelectric generation has declined in recent years, often as a consequence of environmental concerns centering around (1) restriction of upstream and downstream fish passage by the dam, and (2) alteration of water quality and river flows by the impoundment. The Advanced Hydropower Turbine System (AHTS) Program of the U.S. Department of Energy is developing turbine technology which would help to maximize global hydropower resources while minimizing adverse environmental effects. Major technical goals for the Program are (1) the reduction of mortality among turbine-passed fish to 2 percent or less, compared to current levels ranging up to 30 percent or greater; and (2) development of aerating turbines that would ensure that water discharged from reservoirs has a dissolved oxygen concentration of at least 6 mg/L. These advanced, �environmentally friendly� turbines would be suitable both for new hydropower installations and for retrofitting at existing dams. Several new turbine designs that have been he AHTS program are described.
Date:
September 6, 1999
Creator:
Brookshier, P. A.; Cada, G. F.; Flynn, J. V.; Rinehart, B. N.; Sale, M. J. & Sommers, G. L.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 100, No. 144, Ed. 1 Monday, September 6, 1999
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1999
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Alvin Sun (Alvin, Tex.), Vol. 108, No. 110, Ed. 1 Monday, September 6, 1999
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1999
Creator:
Schwind, Jim & Holton, Kathleen
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 77, No. 266, Ed. 1 Monday, September 6, 1999
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1999
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
Effect of Cesium and Xenon Seeding in Negative Hydrogen Ion Sources
It is well known that cesium seeding in volume hydrogen negative ion sources leads to a large reduction of the extracted electron current and in some cases to the enhancement of the negative ion current. The cooling of the electrons due to the addition of this heavy impurity was proposed as a possible cause of the mentioned observations. In order to verify this assumption, the authors seeded the hydrogen plasma with xenon, which has an atomic weight almost equal to that of cesium. The plasma properties were studied in the extraction region of the negative ion source Camembert III using a cylindrical electrostatic probe while the negative ion relative density was studied using laser photodetachment. It is shown that the xenon mixing does not enhance the negative ion density and leads to the increase of the electron density, while the cesium seeding reduces the electron density.
Date:
September 6, 1999
Creator:
Bacal, M.; Brunteau, A. M.; Deniset, C.; Elizarov, L. I.; Sube, F.; Tontegode, A. Y. et al.
Object Type:
Article
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Monday, September 6, 1999
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1999
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Increasing the Space Charge Limit and Other Effects of Cesium Seeding in Hydrogen Negative Ion Sources
The role of cesium seeding in increasing the negative ion current in volume sources is described. By a reduction in the local plasma potential the current of extracted electrons is vastly reduced. As a result, cesium increases the fraction of the transverse space charge limit available to the ions by as much as a factor of three. In addition, cesium can increase the total space charge limit by injection of Cs+ into the presheath-a newly recognized phenomenon consistent with experimental measurements and determined from application of a Double-Vlasov model for negative ion extraction.
Date:
September 6, 1999
Creator:
Bacal, M.; Bruneteau, J.; Raridon, R.J. & Whealton, J.H.
Object Type:
Article
System:
The UNT Digital Library
[News Clip: Judge DWI]
Video footage from the NBC 5 television station in Fort Worth, Texas, to accompany a news story. This story aired at 10 P.M.
Date:
September 6, 1999
Creator:
KXAS-TV (Television station : Fort Worth, Tex.)
Object Type:
Video
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 84, No. 305, Ed. 1 Monday, September 6, 1999
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1999
Creator:
Horn, Richard A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Status of the BNL High Current EBIS Test Stand.
As part of a new, compact heavy ion injector for AGS/RHIC complex at Brookhaven National Laboratory we are developing an Electron Beam Ion Source (EBIS) that would satisfy present and future requirements. Such a source should be capable of producing intensities of e.g. Al{sup 35+} ions of about 3 x 10{sup 9} particles/pulse or U{sup 45+} of about 2 x 10{sup 9} particles/pulse. To achieve this, the required e-beam intensity is 10A, at a pulse length of 100ms. An EBIS test stand has been constructed, designed for the full electron beam power and having close to 1/2 of the trap length of an EBIS for RHIC. Initial electron beam tests have resulted in a 50{micro}s, 13A electron beam. Ion production and extraction has been shown with a 3.1 A, 50 ms electron beam, achieving an ion yield of 19 nC/pulse (neutralization degree of 61%); fast extraction trials have yielded extracted ion pulses of 1mA peak current and 18{micro}s at FWHM. Details of the test stand construction, results of the electron beam studies, and properties of the extracted ion pulse are presented.
Date:
September 6, 1999
Creator:
Beebe, E.
Object Type:
Article
System:
The UNT Digital Library
Three Problems: Nuclear Energy, National Defense and International Cooperation
A little more than half a century into the Nuclear Age, we cannot look back on a peaceful period, but we can say that the second (nuclear) half of the century has seen much less violence than the first half with its two violent wars. Also the second half of the century has seen the fortunate ending of the Cold War. But as to the future, we are left with three great questions. (1) How can the world be provided with ample energy? (2) How can we avoid the potentially devastating sudden applications of new destructive technologies? And finally, (3) How can we preserve the development of the world's new potentialities without producing a continuation of violent conflicts? The development of nuclear reactors appears to provide a most interesting new initiative to make energy available to every one. The reality of this promise is at least indicated by progress in France where electricity now is 80% ''nuclear.'' Unfortunately, fear of radioactivity and fear of weapons proliferation has turned public opinion in many parts of the world against nuclear energy. The fear of radioactivity seems to be exaggerated, as indicated, for instance, in the recent international conference in Vienna on the …
Date:
September 6, 1999
Creator:
Teller, E.
Object Type:
Article
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 99, No. 149, Ed. 1 Sunday, September 6, 1998
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
Cole, Carol
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Alvin Sun-Advertiser (Alvin, Tex.), Vol. 108, No. 9, Ed. 1 Sunday, September 6, 1998
Weekly newspaper from Alvin, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
Schwind, Jim & Looby, Edward
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 76, No. 265, Ed. 1 Sunday, September 6, 1998
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
Dobbs, Gary
Object Type:
Newspaper
System:
The Portal to Texas History
Chickasha Daily Express (Chickasha, Okla.), Ed. 1 Sunday, September 6, 1998
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[Letter about Leadership Lambda Seminar, 1998-09-06]
2 pages: Personalized letter to Mr. Gordon M. Mackey from Leadership Lambda dated September 6, 1998 and general letter to Seminar Series Participant. The letter includes an invitation to a set of class sessions.
Date:
September 6, 1998
Creator:
Leadership Lambda, Inc.
Object Type:
Letter
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 125, No. 73, Ed. 1 Sunday, September 6, 1998
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 116, No. 72, Ed. 1 Sunday, September 6, 1998
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
September 6, 1998
Creator:
White, Barbara
Object Type:
Newspaper
System:
The Portal to Texas History
Progress report of FY 1998 activities: Continued development of an integrated sounding system in support of the DOE/ARM experimental program
Both during September 15-30, 1996 and September 15-October 5, 1997, the Environmental Technology Laboratory (ETL) participated in an experiment at the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site that was designed to study many of the ways that ARM is measuring water vapor. These experiments, called the Water Vapor Intensive Operating Periods (WVIOPs), produced some results of significant importance to ARM water vapor measurements. We have spent the major portion of this years activities in analyzing results of these experiments, and improving algorithms for improving the measurement of precipitable water vapor (PWV) from instruments available at ARM. The most important ARM instrument for this measurement continues to be the Microwave Radiometer (MWR). Measurements of water vapor at the North Slope of Alaska and Adjacent Arctic Ocean (NSA/AAO) CART site in Barrow, Alaska, area potential problem because of the difficulty of radiosondes to measure low amounts of vapor during cold and extremely dry conditions. The applicability of MWR scaling to radiosondes is questionable because of the low sensitivity of these instrument during dry conditions. It has been suggested by the ARM Instantaneous Radiative Flux Working Group and others that measurements of brightness temperature around 183 GHz could be …
Date:
September 6, 1998
Creator:
Westwater, Edgeworth R.; Han, Yong & Leuskiy, Vladimir
Object Type:
Report
System:
The UNT Digital Library
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 83, No. 306, Ed. 1 Sunday, September 6, 1998
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1998
Creator:
Horn, Richard A.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Towards Atomic Column-by-Column Spectroscopy
The optical arrangement of the scanning transmission electron microscope (STEM) is ideally suited for performing analysis of individual atomic columns in materials. Using the incoherent Z-contrast image as a reference, and arranging incoherent conditions also for the spectroscopy, a precise correspondence is ensured between features in the inelastic image and elastic signals. In this way the exact probe position needed to maximise the inelastic signal from a selected column can be located and monitored during the analysis using the much higher intensity elastic signal. Although object functions for EELS are typically less than 1 {Angstrom} full width at half maximum, this is still an order of magnitude larger than the corresponding object functions for elastic (or diffuse) scattering used to form the Z-contrast image. Therefore the analysis is performed with an effective probe that is significantly broader than that used for the reference Z-contrast image. For a 2.2 {Angstrom} probe the effective probe is of the order of 2.5 {Angstrom}, while for a 1.3 {Angstrom} probe the effective probe is 1.6 {Angstrom}. Such increases in effective probe size can significantly reduce or even eliminate contrast between atomic columns that are visible in the image. However, this is only true if …
Date:
September 6, 1998
Creator:
Pennycook, S.J. & Rafferty, B.
Object Type:
Article
System:
The UNT Digital Library
[Wheeler Avenue Baptist Church Bulletin: September 6, 1998]
Church bulletin listing the order of worship for the 7:30 and 11:00 Sunday morning services at the Wheeler Avenue Baptist Church, as well as various notes about upcoming events, congregational news, and other information of relevance to church members.
Date:
September 6, 1998
Creator:
Wheeler Avenue Baptist Church (Houston, Tex.)
Object Type:
Pamphlet
System:
The Portal to Texas History
The Chickasha Star (Chickasha, Okla.), Vol. 96, No. 92, Ed. 1 Saturday, September 6, 1997
Newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 6, 1997
Creator:
Settle, David
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
The Gilmer Mirror (Gilmer, Tex.), Vol. 120, No. 72, Ed. 1 Saturday, September 6, 1997
Semiweekly newspaper from Gilmer, Texas that includes local, state, and national news along with advertising.
Date:
September 6, 1997
Creator:
Overton, Mac
Object Type:
Newspaper
System:
The Portal to Texas History