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Analytical Solution for Subsurface Gas Flow to a Well Induced by Surface Pressure Fluctuations
A simple analytical model is presented for predicting subsurface gas flow to a vadose zone well in response to atmospheric pressure fluctuations (barometric pumping). The effective radial permeability (kr) in the vicinity of the well is determined during model calibration using less than two weeks of data. By combining the flow solution with a solution for the vertical gas pressure, only atmospheric pressure data are required to predict the induced flow through a well. The ability to quantitatively predict naturally induced flow in vadose zone wells by simple and inexpensive measurements is invaluable for systems using barometric pumping for remediation.
Date:
June 20, 2001
Creator:
Rossabi, J.
Object Type:
Article
System:
The UNT Digital Library
Application of a Sixth Order Generalized Stress Function To Determine Limit Loads for Plates with Triangular Penetration Patterns
The capabilities to obtain limit load solutions of plates with triangular penetration patterns using fourth order functions to represent the collapse surface has been presented in previous papers. These papers describe how equivalent solid plate elastic-perfectly plastic finite element capabilities are generated and demonstrated how such capabilities can be used to great advantage in the analysis of tubesheets in large heat exchanger applications. However, these papers have pointed out that although the fourth order functions can produce sufficient accuracy for many practical applications, there are situations where improvements in the accuracy of inplane and transverse shear are desirable. This paper investigates the use of a sixth order function to represent the collapse surface for improved accuracy of the inplane response. Explicit elastic-perfectly plastic finite element solutions are obtained for unit cells representing an infinite array of circular penetrations arranged in an equilateral triangular array. These cells are used to create a numerical representation of the complete collapse surfaces for a number of ligament efficiencies (h/P where h is the minimum ligament width and P is the distance between hole centers). Each collapse surface is then fit to a sixth order function that satisfies the periodicity of the hole pattern. Sixth-order …
Date:
December 20, 2001
Creator:
Gordon, J.L. & Jones, D.P.
Object Type:
Article
System:
The UNT Digital Library
The Application of Reliability-Based Design Factors In Stress Corrosion Cracking Evaluations
First-order reliability methodology (FORM) is used to develop reliability-based design factors for deterministic analyses of stress corrosion cracking. The basic elements of FORM as applied to structural reliability problems are reviewed and then employed specifically to stress corrosion cracking evaluations. Failure due to stress corrosion cracking is defined as crack initiation followed by crack growth to a critical depth. The stress corrosion cracking process is thus represented in terms of a crack initiation time model and a crack growth rate model, with the crack growth rate integrated from the initiation time to the time at which the crack grows to its critical depth. Both models are described by log-normal statistical distribution functions. A procedure is developed to evaluate design factors that are applied to the mean values of the crack initiation time and the crack growth rate for specified temperature and stress conditions. The design factors, which depend on the standard deviations of the statistical distributions, are related to a target reliability, which is inversely related to an acceptable probability of failure. The design factors are not fixed, but are evaluated on a case-to-case basis for each application. The use of these design factors in a deterministic analysis assures that …
Date:
December 20, 2001
Creator:
Friedman, E.
Object Type:
Report
System:
The UNT Digital Library
Application of Sensitivity and Uncertainty Analysis Methods to a Validation Study for Weapons-Grade Mixed-Oxide Fuel
At the Oak Ridge National Laboratory (ORNL), sensitivity and uncertainty (S/U) analysis methods and a Generalized Linear Least-Squares Methodology (GLLSM) have been developed to quantitatively determine the similarity or lack thereof between critical benchmark experiments and an application of interest. The S/U and GLLSM methods provide a mathematical approach, which is less judgment based relative to traditional validation procedures, to assess system similarity and estimate the calculational bias and uncertainty for an application of interest. The objective of this paper is to gain experience with the S/U and GLLSM methods by revisiting a criticality safety evaluation and associated traditional validation for the shipment of weapons-grade (WG) MOX fuel in the MO-1 transportation package. In the original validation, critical experiments were selected based on a qualitative assessment of the MO-1 and MOX contents relative to the available experiments. Subsequently, traditional trending analyses were used to estimate the {Delta}k bias and associated uncertainty. In this paper, the S/U and GLLSM procedures are used to re-evaluate the suite of critical experiments associated with the original MO-1 evaluation. Using the S/U procedures developed at ORNL, critical experiments that are similar to the undamaged and damaged MO-1 package are identified based on sensitivity and uncertainty …
Date:
July 20, 2001
Creator:
Dunn, M.E.
Object Type:
Article
System:
The UNT Digital Library
Appropriations for FY2001: Legislative Branch
Appropriations are one part of a complex federal budget process that includes budget resolutions, appropriations (regular, supplemental, and continuing) bills, rescissions, and budget reconciliation bills. This report is a guide to one of the 13 regular appropriations bills that Congress passes each year. It is designed to supplement the information provided by the House and Senate Appropriations Subcommittees on Legislative Branch Appropriations.
Date:
April 20, 2001
Creator:
Dwyer, Paul E.
Object Type:
Report
System:
The UNT Digital Library
Archer County News (Archer City, Tex.), No. 38, Ed. 1 Thursday, September 20, 2001
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
September 20, 2001
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
Archer County News (Archer City, Tex.), No. 51, Ed. 1 Thursday, December 20, 2001
Weekly newspaper from Archer City, Texas that includes local, state, and national news along with advertising.
Date:
December 20, 2001
Creator:
Lewis, Shelley
Object Type:
Newspaper
System:
The Portal to Texas History
ARF1 Frequency and Amplitude Curve Calibration
ARF1 was calibrated and checked on 4/18/01. The technique used was to set the start/stop timers (A:R1LLT1 and A:R1LLT2) for duration of 200 msec. Driving the cavities for longer than 200 msec at full voltage could put some stress on the Hipotronics anode supply. The Camac curve generator card was substituted with a precision DC voltage source. Data for both amplitude and frequency were taken with the DC source. A HP 8563A spectrum analyzer in zero span with resolution bandwidth of 1 MHz at a center frequency of 52.818 MHz was used to take the amplitude data. The dynamic curve was a triangle waveform provided by a triggered HP3213A function generator. Frequency was measured on the Fluke frequency counter mounted in the rack in AP50 (with the high level RF off). The attached data and graph contain the current calibration. ARF1-1 is slightly lower voltage than ARF1-2, but well within spec. The calibration was made with the Anode supply at 9 Kvolts, the bend busses were off due to an access that was in progress. Due to the unregulated Anode supply, the voltage levels observed may be slightly higher than with bend busses on. The dynamic performance with the triangle …
Date:
April 20, 2001
Creator:
Pasquinelli, Ralph J.
Object Type:
Report
System:
The UNT Digital Library
Army Readiness: Readiness Improved for Selected Divisions, but Manning Imbalances Persist
A letter report issued by the General Accounting Office with an abstract that begins "In recent years, GAO has testified that personnel shortages, assignment priorities, and frequent peacekeeping deployments were undermining the combat readiness of the Army's five later-deploying divisions. In 2001, GAO reported on the Army Chief of Staff's manning initiative of October 1999, which seeks to ensure that all active Army units are assigned the numbers, grades, and skills needed to carry out wartime missions. Since then, terrorists have attacked the World Trade Center and the Pentagon, and the Bush administration has formulated a new military strategy. These developments may change how, when, and where these divisions will be used--as seen in the deployment of soldiers from the 40th Infantry Division in Operation Enduring Freedom. As of June 2001 the five divisions reported they were ready and able to perform all or most of their combat missions. Enlisted personnel levels were at or near 100 percent of their authorization compared with 93 percent in March 1998. However, staffing imbalances persist for some combat support skills. Each division met its training requirements for combat missions. The amount of equipment on hand and the serviceability of that equipment indicated that …
Date:
December 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Aviation Security: Terrorist Acts Demonstrate Urgent Need to Improve Security at the Nation's Airports
Testimony issued by the General Accounting Office with an abstract that begins "A safe and secure civil aviation system is a critical component of the nation's overall security, physical infrastructure, and economic foundation. Billions of dollars and myriad programs and policies have been devoted to achieving such a system. Although it is not fully known at this time what actually occurred or what all the weaknesses in the nation's aviation security apparatus are that contributed to the horrendous events on September 11, 2001, it is clear that serious weaknesses exist in our aviation security system and that their impact can be far more devastating than previously imagined. As reported last year, GAO's review of the Federal Aviation Administration's (FAA) oversight of air traffic control (ATC) computer systems showed that FAA had not followed some critical aspects of its own security requirements. Specifically, FAA had not ensured that ATC buildings and facilities were secure, that the systems themselves were protected, and that the contractors who access these systems had undergone background checks. Controls for limiting access to secure areas, including aircraft, have not always worked as intended. GAO's special agents used fictitious law enforcement badges and credentials to gain access to …
Date:
September 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Aviation Security: Terrorist Acts Illustrate Severe Weaknesses in Aviation Security
Testimony issued by the General Accounting Office with an abstract that begins "A safe and secure civil aviation system is critical to the nation's security, physical infrastructure, and economy. Billions of dollars and myriad programs and policies have been devoted to achieving such a system. Although it is not fully known at this time what actually occurred or what all the weaknesses in the nation's aviation security apparatus are that contributed to the horrendous events on September 11, 2001, it is clear that serious weaknesses exist in our aviation security system and that their impact can be far more devastating than previously imagined. As reported last year, GAO's review of the Federal Aviation Administration's (FAA) oversight of air traffic control (ATC) computer systems showed that FAA had not followed some critical aspects of its own security requirements. Specifically, FAA had not ensured that ATC buildings and facilities were secure, that the systems themselves were protected, and that the contractors who use these systems had undergone background checks. Controls for limiting access to secure areas, including aircraft, have not always worked as intended. GAO's special agents used fictitious law enforcement badges and credentials to gain access to secure areas, bypass security …
Date:
September 20, 2001
Creator:
United States. General Accounting Office.
Object Type:
Text
System:
The UNT Digital Library
Barriers and opportunities: A review of selected successful energy-efficiency programs
In industry, barriers may exist at various points in the decision making process, and in the implementation and management of measures to improve energy efficiency. Barriers may take many forms, and are determined by the business environment and include decision-making processes, energy prices, lack of information, a lack of confidence in the information, or high transaction costs for obtaining reliable information, as well as limited capital availability. Other barriers are the ''invisibility'' of energy efficiency measures and the difficulty of quantifying the impacts, and slow diffusion of innovative technology into markets while firms typically under-invest in R and D, despite the high pay-backs. Various programs try to reduce the barriers to improve the uptake of innovative technologies. A wide array of policies has been used and tested in the industrial sector in industrialized countries, with varying success rates. We review some new approaches to industrial energy efficiency improvement in industrialized countries, focusing on voluntary agreements.
Date:
March 20, 2001
Creator:
Worrell, Ernst & Price, Lynn
Object Type:
Article
System:
The UNT Digital Library
Battery Usage and Thermal Performance of the Toyota Prius and Honda Insight for Various Chassis Dynamometer Test Procedures: Preprint
This study describes the results from the National Renewable Energy Laboratory's (NREL) chassis dynamometer testing of a 2000 model year Honda Insight and 2001 model year Toyota Prius. The tests were conducted for the purpose of evaluating the battery thermal performance, assessing the impact of air conditioning on fuel economy and emissions, and providing information for NREL's Advanced Vehicle Simulator (ADVISOR).
Date:
November 20, 2001
Creator:
Kelly, K. J.; Mihalic, M. & Zolot, M.
Object Type:
Article
System:
The UNT Digital Library
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 55, Ed. 1 Saturday, January 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 86, Ed. 1 Tuesday, February 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 114, Ed. 1 Tuesday, March 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 145, Ed. 1 Friday, April 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 175, Ed. 1 Sunday, May 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 206, Ed. 1 Wednesday, June 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
June 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 236, Ed. 1 Friday, July 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 267, Ed. 1 Monday, August 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 298, Ed. 1 Thursday, September 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 328, Ed. 1 Saturday, October 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 79, No. 358, Ed. 1 Tuesday, November 20, 2001
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 20, 2001
Creator:
Cash, Wanda Garner
Object Type:
Newspaper
System:
The Portal to Texas History