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479 Matching Results
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Frequency Control Concerns in the North American Electric Power System
This paper examines the relationship between system frequency, reliability and markets. It was prompted by the frequency deviations recently experienced at 2200 hours daily but is more generally concerned with the question of what frequency control is necessary. The paper does not provide new information or document new research. Nor is it intended to educate readers concerning power system engineering. Instead, the purpose is to reexamine well known truths concerning the power system and to freshly explore the basic relationship between frequency, reliability and markets: stepping back, if you will, to see if we are collectively missing something. The concern of this paper is with frequency and reliability. Off-nominal frequency can impact reliability and markets efficiency (as we are using the term here) in four ways. It could damage equipment (generation, transmission, or load). It could degrade the quality of the product being delivered to end users (too low and lights would flicker unacceptably, for example). It could result in the collapse of the power system itself (by triggering protective system actions, for example). Or it could result in overloading transmission lines as various generators try to restore system frequency impacting markets efficiency. Often these causes operate in concert. Generator …
Date:
March 26, 2003
Creator:
Kirby, B.J.
Object Type:
Report
System:
The UNT Digital Library
Feasibility Study for Photovoltaics, Wind, solar Hot Water and Hybrid Systems
Southwestern Indian Polytechnic Institute (SIPI) located in Albuquerque New Mexico is a community college that serves American Indians and Alaska Natives. SIPI’s student body represents over 100 Native American Tribes. SIPI completed a renewable energy feasibility study program and established renewable energy hardware on the SIPI campus, which supplements and creates an educational resource to teach renewable energy courses. The SIPI campus is located, and has as student origins, areas, in which power is an issue in remote reservations. The following hardware was installed and integrated into the campus facilities: small wind turbine, large photovoltaic array that is grid-connected, two photovoltaic arrays, one thin film type, and one polycrystalline type, one dual-axis active tracker and one passive tracker, a hot air system for heating a small building, a portable hybrid photovoltaic system for remote power, and a hot water system to preheat water used in the SIPI Child Care facility. Educational curriculum has been developed for two renewable energy courses one being the study of energy production and use, and especially the roles renewable energy forms like solar, wind, geothermal, hydro, and biomass plays, and the second course being a more advanced in-depth study of renewable energy system design, maintenance, …
Date:
March 26, 2008
Creator:
Hooks, Ronald & Montoya, Valerie
Object Type:
Report
System:
The UNT Digital Library
Synthesis of Non-molecular Nitrogen Phases at Mbar Pressures by Direct Laser-heating
Direct laser heating of molecular N2 to above 1400 K at 120-130 GPa results in the formation of a reddish amorphous phase and a transparent crystalline solid above 2000 K. Raman and x-ray data confirm that the transparent phase is cubic-gauche nitrogen (cg-N), while the reddish color of the amorphous phase might indicate the presence of N=N dish bonds. The quenched amorphous phase is stable down to at least 70GPa, analogous to cg-N, and could be a new non-molecular phase or an extension of the already known {eta}-phase. A chemo-physical phase diagram is presented which emphasizes the difference between pressure- and temperature-induced transitions from molecular to non-molecular solids, as found in other low Z systems.
Date:
March 26, 2007
Creator:
Lipp, M. J.; Klepeis, J. P.; Baer, B. J.; Cynn, H.; Evans, W. J.; Iota, V. et al.
Object Type:
Article
System:
The UNT Digital Library
Studies of Correlated-Electron Systems in High Magnetic Fields and at High Pressures
None
Date:
March 26, 2008
Creator:
Cornelius, Dr. Andrew
Object Type:
Report
System:
The UNT Digital Library
Energy dependence of pi, p and pbar transverse momentum spectra for Au+Au collisions at sqrt sNN = 62.4 and 200 GeV
We study the energy dependence of the transverse momentum (pT) spectra for charged pions, protons and anti-protons for Au+Au collisions at sqrt sNN = 62.4 and 200 GeV. Data are presented at mid-rapidity (lbar y rbar< 0.5) for 0.2< pT< 12 GeV/c. In the intermediate pT region (2< pT< 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher pT (pT> 7 GeV/c) the modification is similar for both energies. The p/pi+ and pbar/pi- ratios for central collisions at sqrt sNN = 62.4 GeV peak at pT _~;; 2 GeV/c. In the pT range where recombination is expected to dominate, the p/pi+ ratios at 62.4 GeV are larger than at 200 GeV, while the pbar/pi- ratios are smaller. For pT> 2 GeV/c, the pbar/pi- ratios at the two beam energies are independent of pT and centrality indicating that the dependence of the pbar/pi- ratio on pT does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.
Date:
March 26, 2007
Creator:
Ritter, H
Object Type:
Article
System:
The UNT Digital Library
Ab Initio Many-Body Calculations Of n-3H, n-4He, p-3,4He, And n-10Be Scattering
We develop a new ab initio many-body approach capable of describing simultaneously both bound and scattering states in light nuclei, by combining the resonating-group method with the use of realistic interactions, and a microscopic and consistent description of the nucleon clusters. This approach preserves translational symmetry and Pauli principle. We present phase shifts for neutron scattering on {sup 3}H, {sup 4}He and {sup 10}Be and proton scattering on {sup 3,4}He, using realistic nucleon-nucleon potentials. Our A = 4 scattering results are compared to earlier ab initio calculations. We demonstrate that a proper treatment of the coupling to the n-{sup 10}Be continuum is essential to explain the parity-inverted ground state in {sup 11}Be.
Date:
March 26, 2008
Creator:
Quaglioni, S & Navratil, P
Object Type:
Article
System:
The UNT Digital Library
October 2007 Monitoring Results for Morrill, Kansas.
In September 2005, the Commodity Credit Corporation of the U.S. Department of Agriculture (CCC/USDA) initiated periodic sampling of groundwater in the vicinity of a grain storage facility formerly operated by the CCC/USDA at Morrill, Kansas. On the basis of available information, the CCC/USDA believes that one or more third parties operated this facility after termination of the CCC/USDA's lease in 1971. The sampling at Morrill is being performed on behalf of the CCC/USDA by Argonne National Laboratory, in accord with a monitoring program approved by the Kansas Department of Health and Environment (KDHE), to monitor levels of carbon tetrachloride contamination identified in the groundwater at this site (Argonne 2004, 2005a). Under the KDHE-approved monitoring plan (Argonne 2005b), the groundwater has been sampled twice yearly for a recommended period of two years. The samples are analyzed for volatile organic compounds (VOCs), as well as for selected geochemical parameters to aid in the evaluation of possible natural contaminant degradation (reductive dechlorination) processes in the subsurface environment. The sampling is presently conducted in a network of 12 monitoring wells and 3 private wells (Figure 1.1), at locations approved by the KDHE. The scope of the originally approved monitoring has been expanded to include …
Date:
March 26, 2008
Creator:
LaFreniere, L. M.
Object Type:
Report
System:
The UNT Digital Library
Greensheet (Houston, Tex.), Vol. 39, No. 90, Ed. 1 Wednesday, March 26, 2008
Free weekly newspaper that includes business and classified advertising.
Date:
March 26, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Port Aransas South Jetty (Port Aransas, Tex.), Vol. 39, No. 13, Ed. 1 Thursday, March 26, 2009
Weekly newspaper from Port Aransas, Texas on Mustang Island that includes local, state and national news along with extensive advertising.
Date:
March 26, 2009
Creator:
Judson, Mary Henkel
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 93, Ed. 1 Thursday, March 26, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
March 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Greensheet (Houston, Tex.), Vol. 40, No. 92, Ed. 1 Thursday, March 26, 2009
Free weekly newspaper that includes business and classified advertising.
Date:
March 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
[Clipping: Female pilot supports Stewart's mission]
Newspaper clipping of an article about former WASP member Helen Wyatt Snapp's experiences serving as a pilot in WWII. The clipping includes other articles about local and world news, as well as advertisements.
Date:
March 26, 2009
Creator:
Van Pool, J. Elise
Object Type:
Clipping
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 154, No. 5, Ed. 1 Wednesday, March 26, 2003
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 26, 2003
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 159, No. 5, Ed. 1 Wednesday, March 26, 2008
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
March 26, 2008
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 93, No. 34, Ed. 1 Thursday, March 26, 2009
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
March 26, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 91, No. 38, Ed. 1 Wednesday, March 26, 2008
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
March 26, 2008
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Texas Jewish Post (Fort Worth, Tex.), Vol. 63, No. 13, Ed. 1 Thursday, March 26, 2009
Weekly Jewish newspaper from Fort Worth, Texas that includes local, state and national news along with extensive advertising.
Date:
March 26, 2009
Creator:
Wisch, Rene
Object Type:
Newspaper
System:
The Portal to Texas History
The University News (Irving, Tex.), Vol. 32, No. 18, Ed. 1 Wednesday, March 26, 2003
Weekly student newspaper from the University of Dallas in Irving, Texas that includes campus news and commentaries along with advertising.
Date:
March 26, 2003
Creator:
Hendrickson, Janet & Kuckelman, Meghan
Object Type:
Newspaper
System:
The Portal to Texas History
The Rambler (Fort Worth, Tex.), Vol. 100, No. 7, Ed. 1 Wednesday, March 26, 2008
Weekly student newspaper from Texas Wesleyan University in Fort Worth, Texas that includes campus and local news along with advertising.
Date:
March 26, 2008
Creator:
Poling, Shawn R.
Object Type:
Newspaper
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, Senate Concurrent Resolution 32
Concurrent resolution introduced by the Texas Senate and House of Representatives declaring March 7, 2007, Texas Southern University Day at the State Capitol.
Date:
March 26, 2007
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 100
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to congratulating the Chilton Pirates for winning the 2006 Class A Division II state football championship.
Date:
March 26, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 133
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to commending Larry Carroll of Midland on his 30 years of service with Permian Basin Community Centers for Mental Health and Mental Retardation.
Date:
March 26, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 135
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to commending Special Olympics Texas and welcoming its athletes to the Capitol.
Date:
March 26, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
80th Texas Legislature, Regular Session, House Concurrent Resolution 147
Concurrent resolution introduced by the Texas House of Representatives and Senate relating to congratulating Beverly Marie Pevehouse of Midland on her receipt of the Hope Award from the National Multiple Sclerosis Society.
Date:
March 26, 2007
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History