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Algorithm Summary and Evaluation: Automatic Implementation of Ringdown Analysis for Electromechanical Mode Identification from Phasor Measurements
Small signal stability problems are one of the major threats to grid stability and reliability. Prony analysis has been successfully applied on ringdown data to monitor electromechanical modes of a power system using phasor measurement unit (PMU) data. To facilitate an on-line application of mode estimation, this paper develops a recursive algorithm for implementing Prony analysis and proposed an oscillation detection method to detect ringdown data in real time. By automatically detecting ringdown data, the proposed method helps guarantee that Prony analysis is applied properly and timely on the ringdown data. Thus, the mode estimation results can be performed reliably and timely. The proposed method is tested using Monte Carlo simulations based on a 17-machine model and is shown to be able to properly identify the oscillation data for on-line application of Prony analysis. In addition, the proposed method is applied to field measurement data from WECC to show the performance of the proposed algorithm.
Date:
February 28, 2010
Creator:
Zhou, Ning; Huang, Zhenyu; Tuffner, Francis K.; Jin, Shuangshuang; Lin, Jenglung & Hauer, Matthew L.
Object Type:
Report
System:
The UNT Digital Library
The Altus Times (Altus, Okla.), Vol. 112, No. 60, Ed. 1 Sunday, February 28, 2010
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 28, 2010
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
ARM Climate Research Facility Instrumentation Status and Information January 2010
The purpose of this report is to provide a concise but comprehensive overview of Atmospheric Radiation Measurement Climate Research Facility instrumentation status. The report is divided into the following five sections: (1) new instrumentation in the process of being acquired and deployed, (2) field campaigns, (3) existing instrumentation and progress on improvements or upgrades, (4) proposed future instrumentation, and (5) Small Business Innovation Research instrument development.
Date:
February 28, 2010
Creator:
Voyles, J. W.
Object Type:
Report
System:
The UNT Digital Library
Efficient Windows Collaborative: Research Tool Dissemination to Increase Energy Efficient Fenestration Product Penetration
The project goals covered both the residential and commercial windows markets and involved a range of audiences such as window manufacturers, builders, homeowners, design professionals, utilities, and public agencies. Essential goals included: (1) Creation of 'Master Toolkits' of information that integrate diverse tools, rating systems, and incentive programs, customized for key audiences such as window manufacturers, design professionals, and utility programs. (2) Delivery of education and outreach programs to multiple audiences through conference presentations, publication of articles for builders and other industry professionals, and targeted dissemination of efficient window curricula to professionals and students. (3) Design and implementation of mechanisms to encourage and track sales of more efficient products through the existing Window Products Database as an incentive for manufacturers to improve products and participate in programs such as NFRC and ENERGY STAR. (4) Development of utility incentive programs to promote more efficient residential and commercial windows. Partnership with regional and local entities on the development of programs and customized information to move the market toward the highest performing products. An overarching project goal was to ensure that different audiences adopt and use the developed information, design and promotion tools and thus increase the market penetration of energy efficient fenestration …
Date:
February 28, 2010
Creator:
Alliance to Save Energy (U.S.)
Object Type:
Report
System:
The UNT Digital Library
Ensemble: 2010-02-28 – Opera and Symphony Orchestra
Access:
Use of this item is restricted to the UNT Community
Recording of the first Sunday afternoon performance of the opera "Prodaná nevěsta (The Bartered Bride)" at the UNT College of Music Lyric Theater.
Date:
February 28, 2010, 3:00 p.m.
Creator:
University of North Texas. Division of Vocal Studies. Opera.
Object Type:
Sound
System:
The UNT Digital Library
Hanford Site Annual Report Radiological Dose Calculation Upgrade Evaluation
Operations at the Hanford Site, Richland, Washington, result in the release of radioactive materials to offsite residents. Site authorities are required to estimate the dose to the maximally exposed offsite resident. Due to the very low levels of exposure at the residence, computer models, rather than environmental samples, are used to estimate exposure, intake, and dose. A DOS-based model has been used in the past (GENII version 1.485). GENII v1.485 has been updated to a Windows®-based software (GENII version 2.08). Use of the updated software will facilitate future dose evaluations, but must be demonstrated to provide results comparable to those of GENII v1.485. This report describes the GENII v1.485 and GENII v2.08 dose exposure, intake, and dose estimates for the maximally exposed offsite resident reported for calendar year 2008. The GENII v2.08 results reflect updates to implemented algorithms. No two environmental models produce the same results, as was again demonstrated in this report. The aggregated dose results from 2008 Hanford Site airborne and surface water exposure scenarios provide comparable dose results. Therefore, the GENII v2.08 software is recommended for future offsite resident dose evaluations.
Date:
February 28, 2010
Creator:
Snyder, Sandra F.
Object Type:
Report
System:
The UNT Digital Library
Integrated Control of Next Generation Power System
Control methodologies provide the necessary data acquisition, analysis and corrective actions needed to maintain the state of an electric power system within acceptable operating limits. These methods are primarily software-based algorithms that are nonfunctional unless properly integrated with system data and the appropriate control devices. Components of the control of power systems today include protective relays, supervisory control and data acquisition (SCADA), distribution automation (DA), feeder automation, software agents, sensors, control devices and communications. Necessary corrective actions are still accomplished using large electromechanical devices such as vacuum, oil and gas-insulated breakers, capacitor banks, regulators, transformer tap changers, reclosers, generators, and more recently FACTS (flexible AC transmission system) devices. The recent evolution of multi-agent system (MAS) technologies has been reviewed and effort made to integrate MAS into next generation power systems. A MAS can be defined as âÂÂâ¦a loosely-coupled network of problem solvers that work together to solve problems that are beyond their individual capabilitiesâ¦âÂÂ. These problem solvers, often called agents, are autonomous and may be heterogeneous in nature. This project has shown that a MAS has significant advantages over a single, monolithic, centralized problem solver for next generation power systems. Various communication media are being used in the electric power …
Date:
February 28, 2010
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Panola Watchman (Carthage, Tex.), Vol. 138, No. 17, Ed. 1 Sunday, February 28, 2010
Semiweekly newspaper from Carthage, Texas that includes local, state, and national news along with advertising.
Date:
February 28, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Polk County Enterprise (Livingston, Tex.), Vol. 128, No. 17, Ed. 1 Sunday, February 28, 2010
Semi-weekly newspaper from Livingston, Texas that includes local, state and national news along with advertising.
Date:
February 28, 2010
Creator:
Reddell, Valerie
Object Type:
Newspaper
System:
The Portal to Texas History
Sapulpa Daily Herald (Sapulpa, Okla.), Vol. 95, No. 117, Ed. 1 Sunday, February 28, 2010
Daily newspaper from Sapulpa, Oklahoma that includes local, state, and national news along with advertising.
Date:
February 28, 2010
Creator:
Shance, Brenda
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Singapore's Zero-Energy Building's daylight monitoring system
A setup to monitor the daylighting performance of different glazing types in Singapore is presented. The glazing is installed in the facade of four dedicated testing chambers in BCAA's Zero Energy Building in Singapore. These test rooms are equipped with sensors that both record illuminances on the work plane, and luminances as seen by occupants. The physical and logical design of the monitoring system is presented. Criteria to assess the daylighting performance are introduced, and initial results of the work in progress are presented.
Date:
February 28, 2010
Creator:
Grobe, Lars; Wittkopf, Stephen; Pandey, Anupama Rana; Xiaoming, Yang; Seng, Ang Kian; Scartezzini, Jean-Louis et al.
Object Type:
Article
System:
The UNT Digital Library
Sweetwater Reporter (Sweetwater, Tex.), Vol. [112], No. [089], Ed. 1 Sunday, February 28, 2010
Daily newspaper from Sweetwater, Texas that includes local, state, and national news along with advertising.
Date:
February 28, 2010
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Thermodynamically Tuned Nanophase Materials for reversible Hydrogen storage
This program was devoted to significantly extending the limits of hydrogen storage technology for practical transportation applications. To meet the hydrogen capacity goals set forth by the DOE, solid-state materials consisting of light elements were developed. Many light element compounds are known that have high capacities. However, most of these materials are thermodynamically too stable, and they release and store hydrogen much too slowly for practical use. In this project we developed new light element chemical systems that have high hydrogen capacities while also having suitable thermodynamic properties. In addition, we developed methods for increasing the rates of hydrogen exchange in these new materials. The program has significantly advanced (1) the application of combined hydride systems for tuning thermodynamic properties and (2) the use of nanoengineering for improving hydrogen exchange. For example, we found that our strategy for thermodynamic tuning allows both entropy and enthalpy to be favorably adjusted. In addition, we demonstrated that using porous supports as scaffolds to confine hydride materials to nanoscale dimensions could improve rates of hydrogen exchange by > 50x. Although a hydrogen storage material meeting the requirements for commercial development was not achieved, this program has provided foundation and direction for future efforts. More …
Date:
February 28, 2010
Creator:
Liu, Ping & Vajo, John J.
Object Type:
Report
System:
The UNT Digital Library
Time-windows-based filtering method for near-surface detection of leakage from geologic carbon sequestration sites
We use process-based modeling techniques to characterize the temporal features of natural biologically controlled surface CO{sub 2} fluxes and the relationships between the assimilation and respiration fluxes. Based on these analyses, we develop a signal-enhancing technique that combines a novel time-window splitting scheme, a simple median filtering, and an appropriate scaling method to detect potential signals of leakage of CO{sub 2} from geologic carbon sequestration sites from within datasets of net near-surface CO{sub 2} flux measurements. The technique can be directly applied to measured data and does not require subjective gap filling or data-smoothing preprocessing. Preliminary application of the new method to flux measurements from a CO{sub 2} shallow-release experiment appears promising for detecting a leakage signal relative to background variability. The leakage index of ?2 was found to span the range of biological variability for various ecosystems as determined by observing CO{sub 2} flux data at various control sites for a number of years.
Date:
February 28, 2010
Creator:
Pan, L.; Lewicki, J. L.; Oldenburg, C. M. & Fischer, M. L.
Object Type:
Article
System:
The UNT Digital Library
Analyses by the Defense Waste Processing Facility Laboratory of Thorium Glasses from the Sludge Batch 6 Variability Study
The Savannah River Remediation (SRR) Defense Waste Processing Facility (DWPF) is currently processing Sludge Batch 6 (SB6) with Frit 418. At times during the processing of this glass system, thorium is expected to be at concentrations in the final wasteform that make it a reportable element for the first time since startup of radioactive operations at the DWPF. The Savannah River National Laboratory (SRNL) supported the qualification of the processing of this glass system at the DWPF. A recommendation from the SRNL studies was the need for the DWPF Laboratory to establish a method to measure thorium by Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICPAES). This recommendation led to the set of thorium-bearing glasses from the SB6 Variability Study (VS) being submitted to the DWPF Laboratory for chemical composition measurement. The measurements were conducted by the DWPF Laboratory using the sodium peroxide fusion preparation method routinely employed for analysis of samples from the Slurry Mix Evaporator (SME). These measurements are presented and reviewed in this report. The review indicates that the measurements provided by the DWPF Laboratory are comparable to those provided by Analytical Development's laboratory at SRNL for these same glasses. As a result, the authors of this …
Date:
February 28, 2011
Creator:
Edwards, T.; Click, D. & Feller, M.
Object Type:
Report
System:
The UNT Digital Library
Analysis of IECC (2003, 2006, 2009) and ASHRAE 90.1-2007 Commercial Energy Code Requirements for Mesa, AZ.
This report summarizes code requirements and energy savings of commercial buildings in Climate Zone 2B built to the 2009 IECC and ASHRAE Standard 90.1-2007 when compared to the 2003 IECC and the 2006 IECC. In general, the 2009 IECC and ASHRAE Standard 90.1-2007 have higher insulation requirements for exterior walls, roof, and windows and have higher efficiency requirements for HVAC equipment. HVAC equipment efficiency requirements are governed by National Appliance Conversion Act of 1987 (NAECA), and are applicable irrespective of the IECC version adopted. The energy analysis results show that commercial buildings meeting the 2009 IECC requirements save 4.4% to 9.5% site energy and 4.1% to 9.9% energy cost when compared to the 2006 IECC; and save 10.6% to 29.4% site energy and 10.3% to 29.3% energy cost when compared to the 2003 IECC. Similar analysis comparing ASHRAE Standard 90.1-2007 requirements to the 2006 IECC shows that the energy savings are in the 4.0% to 10.7% for multi-family and retail buildings, but less than 2% for office buildings. Further comparison of ASHRAE Standard 90.1-2007 requirements to the 2003 IECC show site energy savings in the range of 7.7% to 30.6% and energy cost savings range from 7.9% to 30.3%. Both …
Date:
February 28, 2011
Creator:
Huang, Yunzhi & Gowri, Krishnan
Object Type:
Report
System:
The UNT Digital Library
Battery-free Wireless Sensor Network For Advanced Fossil-Fuel Based Power Generation
This report summarizes technical progress achieved during the project supported by the Department of Energy under Award Number DE-FG26-07NT4306. The aim of the project was to conduct basic research into battery-free wireless sensing mechanism in order to develop novel wireless sensors and sensor network for physical and chemical parameter monitoring in a harsh environment. Passive wireless sensing platform and five wireless sensors including temperature sensor, pressure sensor, humidity sensor, crack sensor and networked sensors developed and demonstrated in our laboratory setup have achieved the objective for the monitoring of various physical and chemical parameters in a harsh environment through remote power and wireless sensor communication, which is critical to intelligent control of advanced power generation system. This report is organized by the sensors developed as detailed in each progress report.
Date:
February 28, 2011
Creator:
Jia, Yi
Object Type:
Report
System:
The UNT Digital Library
[Breakfast hall in the Driskell Hotel in Austin]
Photograph of a dining hall where many guests are seen having their breakfast as a man stands at a podium and speaks to them during the 2011 Texas Daily Newspaper Association annual meeting held at the Driskell Hotel in Austin.
Date:
February 28, 2011
Creator:
Sharp, Andy
Object Type:
Photograph
System:
The UNT Digital Library
Coal/Biomass Gasification at the Colorado School of Mines
This program was a 2.5 year effort focused on technologies that support coal and biomass gasification. Two primary tasks were included in the effort: 1) Coal/Biomass gasification and system optimization and 2) development of high temperature microchannel ceramic heat exchangers.
Date:
February 28, 2011
Creator:
Parker, Terry; Braun, Robert; Dreyer, Chris; Dean, Anthony; Eberhart, Mark; Kee, Robert et al.
Object Type:
Report
System:
The UNT Digital Library
Completion Report for Wells ER-20-8 and ER-20-8#2 Corrective Action Units 101 and 102: Central and Western Pahute Mesa
Wells ER-20-8 and ER-20-8#2 were drilled for the U.S. Department of Energy, National Nuclear Security Administration Nevada Site Office in support of the Nevada Environmental Restoration Project at the Nevada National Security Site (formerly Nevada Test Site), Nye County, Nevada. The holes were drilled in July and August 2009, as part of the Pahute Mesa Phase II drilling program. The primary purpose of these wells was to provide detailed hydrogeologic information in the Tertiary volcanic section that will help address uncertainties within the Pahute Mesa–Oasis Valley hydrostratigraphic framework model. They may also be used as long-term monitoring wells.
Date:
February 28, 2011
Creator:
National Security Technologies, LLC
Object Type:
Report
System:
The UNT Digital Library
Continuing Resolutions: Latest Action and Brief Overview of Recent Practices
This report is divided into two segments. The first section provides the most recent information on the FY2011 continuing resolution. The second segment focuses on the (1) history and recent trends, including the nature, scope, and duration of CRs during the past 35 years; (2) CR types by duration; (3) major substantive legislative provisions included in some CRs; and (4) funding gaps.
Date:
February 28, 2011
Creator:
Streeter, Sandy
Object Type:
Report
System:
The UNT Digital Library
Critical challenges for EUV resist materials
Although Extreme ultraviolet lithography (EUVL) is now well into the commercialization phase, critical challenges remain in the development of EUV resist materials. The major issue for the 22-nm half-pitch node remains simultaneously meeting resolution, line-edge roughness (LER), and sensitivity requirements. Although several materials have met the resolution requirements, LER and sensitivity remain a challenge. As we move beyond the 22-nm node, however, even resolution remains a significant challenge. Chemically amplified resists have yet to demonstrate the required resolution at any speed or LER for 16-nm half pitch and below. Going to non-chemically amplified resists, however, 16-nm resolution has been achieved with a LER of 2 nm but a sensitivity of only 70 mJ/cm{sup 2}.
Date:
February 28, 2011
Creator:
Naulleau, Patrick P.; Anderson, Christopher N.; Baclea-an, Lorie-Mae; Denham, Paul; George, Simi; Goldberg, Kenneth A. et al.
Object Type:
Article
System:
The UNT Digital Library
[Dale Robertson receiving award]
Photograph of Dale Robertson receiving an award during the 2011 Texas Daily Newspaper Association annual meeting held at the Driskell Hotel in Austin. The award reads, "Fred Hartman Award for excellence in sports writing to Dale Robertson."
Date:
February 28, 2011
Creator:
Sharp, Andy
Object Type:
Photograph
System:
The UNT Digital Library
[Darrell Coleman receiving an award]
Photograph of Darrell Coleman (left) receiving an award from an unidentified man during the 2011 Texas Daily Newspaper Association annual meeting held at the Driskell Hotel in Austin.
Date:
February 28, 2011
Creator:
Sharp, Andy
Object Type:
Photograph
System:
The UNT Digital Library