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Advanced Techniques for Power System Identification from Measured Data

Description: Time-synchronized measurements provide rich information for estimating a power-system's electromechanical modal properties via advanced signal processing. This information is becoming critical for the improved operational reliability of interconnected grids. A given mode's properties are described by its frequency, damping, and shape. Modal frequencies and damping are useful indicators of power-system stress, usually declining with increased load or reduced grid capacity. Mode shape provides cr… more
Date: November 25, 2008
Creator: Pierre, John W.; Wies, Richard & Trudnowski, Daniel
Item Type: Refine your search to only Report
open access

Airport Improvement Program: Issues for Congress

Description: This report discusses the Airport Improvement Program and its complement, the passenger facility charge (PFC), within the broader context of airport capital development finance. After a brief history of federal support for airport construction and improvement, the report describes AIP funding, its source of revenues, funding distribution, and the types of projects the program funds
Date: April 25, 2008
Creator: Kirk, Robert S.
Item Type: Refine your search to only Report
open access

ALT-GTS-Stem Fabrication

Description: In 2007, a study investigated options to manufacture stems utilizing methods that would replace crush form grinding while maintaining or improving quality at a comparative cost. Crush form grinding is a special process used at the Kansas City Plant to finish stem sections of reservoir products. However, crush form grinding is a complex process with many variables affecting the final product. This study identified two potential methods that can be applied to stems. Profile grinding was investiga… more
Date: September 25, 2008
Creator: Nguyen, Thuan
Item Type: Refine your search to only Report
open access

Analysis of community structure in networks of correlated data

Description: We present a reformulation of modularity that allows the analysis of the community structure in networks of correlated data. The new modularity preserves the probabilistic semantics of the original definition even when the network is directed, weighted, signed, and has self-loops. This is the most general condition one can find in the study of any network, in particular those defined from correlated data. We apply our results to a real network of correlated data between stores in the city of Ly… more
Date: December 25, 2008
Creator: Gomez, S.; Jensen, P. & Arenas, A.
Item Type: Refine your search to only Article
open access

An Analysis of the Price Elasticity of Demand for Household Appliances

Description: This report summarizes our study of the price elasticity of demand for home appliances, including refrigerators, clothes washers, and dishwashers. In the context of increasingly stringent appliance standards, we are interested in what kind of impact the increased manufacturing costs caused by higher efficiency requirements will have on appliance sales. We begin with a review of existing economics literature describing the impact of economic variables on the sale of durable goods.We then describ… more
Date: January 25, 2008
Creator: Fujita, Kimberly; Dale, Larry & Fujita, K. Sydny
Item Type: Refine your search to only Report
open access

Animal Waste and Hazardous Substances: Current Laws and Legislative Issues

Description: This report describes the provisions of Superfund and Emergency Planning and Community Right-to-Know Act (EPCRA), and enforcement actions under these laws that have increasingly been receiving attention. Congressional scrutiny in the form of legislative proposals and a House hearing in the 109th Congress are discussed.
Date: January 25, 2008
Creator: Copeland, Claudia
Item Type: Refine your search to only Report
open access

Application Of Chiral Two- And Three-Nucleon Interactions To The 4He Photo-Disintegration

Description: We report on an ab initio calculation of the {sup 4}He total photo-absorption cross section using two- and three-nucleon interactions based upon chiral effective field theory. The microscopic treatment of the continuum problem is achieved using the Lorentz integral transform method, applied within the no-core shell model approach.
Date: January 25, 2008
Creator: Quaglioni, S & Navratil, P
Item Type: Refine your search to only Article
open access

Aviation Safety: FAA Has Increased Efforts to Address Runway Incursions

Description: Testimony issued by the Government Accountability Office with an abstract that begins "Despite a recent reduction in air traffic due to economic factors, congestion on airport runways remains a safety concern. The nation's aviation system is still expected to grow and become more crowded in the coming years, exacerbating concerns about ground safety issues, including runway incursions, which occur when aircraft enter runways without authorization. This statement addresses (1) recent trends in r… more
Date: September 25, 2008
Creator: United States. Government Accountability Office.
Item Type: Refine your search to only Text
open access

Balkan Cooperation on War Crimes Issues

Description: Full cooperation with ICTY has long been a key prerequisite to advancing the shared goal of closer association with and eventual membership in the European Union and NATO for the western Balkan countries. This policy of conditionality has affected Serbia the most, but also other western Balkan countries to varying degrees.
Date: July 25, 2008
Creator: Kim, Julie
Item Type: Refine your search to only Report
open access

Beam-Based Alignment, Tuning and Beam Dynamics Studies for the ATF2 Extraction Line and Final Focus System

Description: Using a new extraction line currently under construction, the ATF2 experiment plans to test the novel compact final focus optics design with local chromaticity correction intended for use in future linear colliders. With a 1.3 GeV design beam of 30nm normalized vertical emittance extracted from the ATF damping ring, the primary goal is to achieve a vertical spot-size at the IP waist of 37nm. We discuss our planned strategy for tuning the ATF2 beam to meet the primary goal. Simulation studies ha… more
Date: July 25, 2008
Creator: White, Glen R.; /LAL, Orsay /SLAC; Molloy, S.; Woodley, M. & /SLAC
Item Type: Refine your search to only Article
open access

Beam dynamics limits for low-energy RHIC operation

Description: There is a strong interest in low-energy RHIC operations in the single-beam total energy range of 2.5-25 GeV/nucleon [1-3]. Collisions in this energy range, much of which is below nominal RHIC injection energy, will help to answer one of the key questions in the field of QCD about the existence and location of a critical point on the QCD phase diagram [4]. There have been several short test runs during 2006-2008 RHIC operations to evaluate RHIC operational challenges at these low energies [5]. … more
Date: August 25, 2008
Creator: Fedotov, A. V.; Ben-Zvi, Ilan; Chang, X.; Kayran, D.; Litvinenko, V. N.; Pozdeyev, E. et al.
Item Type: Refine your search to only Article
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