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92
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25
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12
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District of Columbia: Performance Report Shows Continued Progress
A letter report issued by the General Accounting Office with an abstract that begins "The Federal Payment Reauthorization Act of 1994 (Pub. L. 103-373) requires the District of Columbia to submit to the Congress a performance accountability plan with goals for the upcoming year, and after the end of the fiscal year, a performance accountability report on the extent to which the District achieved the goals in the plan. The 1994 act further requires that GAO review and evaluate the District's performance accountability report."
Date:
May 15, 2003
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
Measurement of actinide neutron cross sections
The maintenance of strong scientific expertise is criticalto the U.S. nuclear attribution community. It is particularly importantto train students in actinide chemistry and physics. Neutroncross-section data are vital components to strategies for detectingexplosives and fissile materials, and these measurements requireexpertise in chemical separations, actinide target preparation, nuclearspectroscopy, and analytical chemistry. At the University of California,Berkeley and the Lawrence Berkeley National Laboratory we have trainedstudents in actinide chemistry for many years. LBNL is a leader innuclear data and has published the Table of Isotopes for over 60 years.Recently, LBNL led an international collaboration to measure thermalneutron capture radiative cross sections and prepared the EvaluatedGamma-ray Activation File (EGAF) in collaboration with the IAEA. Thisfile of 35,000 prompt and delayed gamma ray cross-sections for allelements from Z=1-92 is essential for the neutron interrogation ofnuclear materials. LBNL has also developed new, high flux neutrongenerators and recently opened a 1010 n/s D+D neutron generatorexperimental facility.
Date:
June 15, 2003
Creator:
Firestone, Richard B.; Nitsche, Heino; Leung, Ka-Ngo; Perry, DaleL. & English, Gerald
Object Type:
Report
System:
The UNT Digital Library
Cryogenic refrigeration requirements for superconducting insertion devices in a light source
This report discusses cryogenic cooling superconducting insertion devices for modern light sources. The introductory part of the report discusses the difference between wiggler and undulators and how the bore temperature may affect the performance of the magnets. The steps one would take to reduce the gap between the cold magnet pole are discussed. One section of the report is devoted to showing how one would calculate the heat that enters the device. Source of heat include, heat entering through the vacuum chamber, heating due to stray electrons and synchrotron radiation, heating due to image current on the bore, heat flow by conduction and radiation, and heat transfer into the cryostat through the magnet leads. A section of he report is devoted to cooling option such as small cryo-cooler and larger conventional helium refrigerators. This section contains a discussion as to when it is appropriate to use small coolers that do not have J-T circuits. Candidates small cryo-coolers are discussed in this section of the report. Cooling circuits for cooling with a conventional refrigerator are also discussed. A section of the report is devoted to vibration isolation and how this may affect how the cooling is attached to the device. Vibration …
Date:
August 15, 2003
Creator:
Green, Michael A.; Green, Michael A. & Green, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Probing Interactions at the Nanoscale: Sensing Protein Molecules
Introduction We have developed a high-frequency electronic biosensor of parallel-plate geometry that is embedded within a microfluidic device. This novel biosensor allows us to perform dielectric spectroscopy on a variety of biological samples—from cells to molecules—in solution. Because it is purely electronic, the sensor allows for rapid characterization with no sample preparation or chemical alteration. In addition, it is capable of probing length scales from millimeters to microns over a frequency range 50 MHz to 40 GHz, and sample volumes as small as picoliters [1,2]. Our high-frequency biosensor has evolved from previous device designs based on a coplanar waveguide (CPW) geometry [2]. For our current device, we employ microfluidic tectonics (µFT) [3] to embed two microstrip conductors within a microfluidic channel. The electronic coupling between the two conductors is greater than in our previous CPW design and more importantly, leads to an enhanced sensitivity. Our utilization of µFT allows us to incorporate easily this high-frequency electronic biosensor with a variety of lab-on-a-chip architectures. Device Description Figure 1 is a schematic of our high-frequency electronic biosensor. We fabricate this sensor by first depositing a 500 Å seed layer of gold onto two glass microscope slides. We then use photolithography to pattern …
Date:
September 15, 2003
Creator:
Sohn, Lydia; Weiss, Ron & Tavazoie, Saeed
Object Type:
Report
System:
The UNT Digital Library
Cryogenic refrigeration requirements for superconducting insertion devices in a light source
This report discusses cryogenic cooling superconducting insertion devices for modern light sources. The introductory part of the report discusses the difference between wiggler and undulators and how the bore temperature may affect the performance of the magnets. The steps one would take to reduce the gap between the cold magnet pole are discussed. One section of the report is devoted to showing how one would calculate the heat that enters the device. Source of heat include, heat entering through the vacuum chamber, heating due to stray electrons and synchrotron radiation, heating due to image current on the bore, heat flow by conduction and radiation, and heat transfer into the cryostat through the magnet leads. A section of the report is devoted to cooling options such as small cryo-cooler and larger conventional helium refrigerators. This section contains a discussion as to when it is appropriate to use small coolers that do not have J-T circuits. Candidate small cryo-coolers are discussed in this section of the report. Cooling circuits for cooling with a conventional refrigerator are also discussed. A section of the report is devoted to vibration isolation and how this may affect how the cooling is attached to the device. Vibration …
Date:
August 15, 2003
Creator:
Green, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Direct to Digital Holography
In this CRADA, Oak Ridge National Laboratory (ORNL) assisted nLine Corporation of Austin, TX in the development of prototype semiconductor wafer inspection tools based on the direct-to-digital holographic (DDH) techniques invented at ORNL. Key components of this work included, development of the first prototype named the Visible Alpha Tool (VAT) that uses visible spectrum illumination of 532 nm, assist in design of second prototype tool named the DUV Alpha Tool (DAT) using deep UV (266 nm) illumination, and continuing support of nLine in the development of higher throughput commercial tools.
Date:
June 15, 2003
Creator:
Bingham, P.R. & Tobin, K.W.
Object Type:
Report
System:
The UNT Digital Library
Flow Instabilities During Injection of CO2 into SalineAquifers
Injection of carbon dioxide (CO{sub 2}) into saline aquifers has been proposed as a means to reduce greenhouse gas emissions (geological carbon sequestration). The injection process can be classified as immiscible displacement of an aqueous phase by a less dense and less viscous gas phase. Under disposal conditions (supercritical CO{sub 2}) the viscosity of carbon dioxide can be less than the viscosity of the aqueous phase by a factor of 15. Because of the lower viscosity, the CO{sub 2} displacement front will have a tendency towards instability so that waves or rounded lobes of saturation may appear and grow into fingers that lead to enhanced dissolution, bypassing, and possibly poor sweep efficiency. This paper presents an analysis, through high-resolution numerical simulations, of the onset of instabilities (viscous fingering) during injection of CO{sub 2} into saline aquifers. We explore the influence of viscosity ratio, relative permeability functions, and capillary pressure on finger growth and spacing. In addition, we address the issues of finger triggering, convergence under grid refinement and boundary condition effects. Simulations were carried out on scalar machines, and on an IBM RS/6000 SP (a distributed-memory parallel computer with 6080 processors) with a parallelized version of TOUGH2.
Date:
April 15, 2003
Creator:
Garcia, Julio E. & Pruess, Karsten
Object Type:
Article
System:
The UNT Digital Library
Engine Control Improvement through Application of Chaotic Time Series Analysis
The objective of this program was to investigate cyclic variations in spark-ignition (SI) engines under lean fueling conditions and to develop options to reduce emissions of nitrogen oxides (NOx) and particulate matter (PM) in compression-ignition direct-injection (CIDI) engines at high exhaust gas recirculation (EGR) rates. The CIDI activity builds upon an earlier collaboration between ORNL and Ford examining combustion instabilities in SI engines. Under the original CRADA, the principal objective was to understand the fundamental causes of combustion instability in spark-ignition engines operating with lean fueling. The results of this earlier activity demonstrated that such combustion instabilities are dominated by the effects of residual gas remaining in each cylinder from one cycle to the next. A very simple, low-order model was developed that explained the observed combustion instability as a noisy nonlinear dynamical process. The model concept lead to development of a real-time control strategy that could be employed to significantly reduce cyclic variations in real engines using existing sensors and engine control systems. This collaboration led to the issuance of a joint patent for spark-ignition engine control. After a few years, the CRADA was modified to focus more on EGR and CIDI engines. The modified CRADA examined relationships between …
Date:
July 15, 2003
Creator:
Green, J.B., Jr. & Daw, C.S.
Object Type:
Report
System:
The UNT Digital Library
Interannual Variability in Global Soil Respiration on a 0.5 Degree Grid Cell Basis (1980-1994)
We used a climate-driven regression model to develop spatially resolved estimates of soil-CO{sub 2} emissions from the terrestrial land surface for each month from January 1980 to December 1994, to evaluate the effects of interannual variations in climate on global soil-to-atmosphere CO{sub 2} fluxes. The mean annual global soil-CO{sub 2} flux over this 15-y period was estimated to be 80.4 (range 79.3-81.8) Pg C. Monthly variations in global soil-CO{sub 2} emissions followed closely the mean temperature cycle of the Northern Hemisphere. Globally, soil-CO{sub 2} emissions reached their minima in February and peaked in July and August. Tropical and subtropical evergreen broad-leaved forests contributed more soil-derived CO{sub 2} to the atmosphere than did any other vegetation type ({approx}30% of the total) and exhibited a biannual cycle in their emissions. Soil-CO{sub 2} emissions in other biomes exhibited a single annual cycle that paralleled the seasonal temperature cycle. Interannual variability in estimated global soil-CO{sub 2} production is substantially less than is variability in net carbon uptake by plants (i.e., net primary productivity). Thus, soils appear to buffer atmospheric CO{sub 2} concentrations against far more dramatic seasonal and interannual differences in plant growth. Within seasonally dry biomes (savannas, bushlands, and deserts), interannual variability in …
Date:
September 15, 2003
Creator:
Raich, J.W.
Object Type:
Report
System:
The UNT Digital Library
Linking reaction, transport, and hydrological parameters inunsaturated fractured rock: toughreact implementation andapplication
Modeling coupled water-gas-rock interactions in unsaturated fractured rock requires conceptual and numerical model considerations beyond those developed for saturated porous media. This paper focuses on the integration of the geological and hydrological parameters into the calculation of reactive-transport parameters and the feedback of mineral precipitation/dissolution to flow and transport. These basic relations have been implemented in the reactive transport code TOUGHREACT (Xu et al., 2003) that couples equilibrium and kinetic water-gas-rock inter-actions with multiphase flow and aqueous and gaseous species transport. Simulation results are presented illustrating the effects of water-rock interaction accompanying the heating of unsaturated heterogeneous fractured tuff. Unknowns associated with modeling water-rock interaction in fractured unsaturated systems are the area of the fracture surface that is wetted and which fractures are active components of the overall flow system. The wetted fracture area is important not only to water-rock interaction but to flow and transport between fluids flowing in fractures and the adjacent matrix. The other unknown relations are those describing permeability and capillary pressure modification during mineral precipitation and dissolution. Here we discuss solely the relations developed for fractures and the fracture-matrix interface.
Date:
May 15, 2003
Creator:
Sonnenthal, Eric; Spycher, Nicolas & Xu, Tianfu
Object Type:
Article
System:
The UNT Digital Library
[Historic Marker Application: Benjamin Franklin and Mary Hay Langford, Jr. Home]
Application materials submitted to the Texas Historical Commission requesting a historic marker for the Benjamin Franklin and Mary Hay Langford, Jr. Home, in Bandera, Texas. The materials include the inscription text of the marker, narrative, and photographs.
Date:
January 15, 2003
Creator:
Texas Historical Commission
Object Type:
Text
System:
The Portal to Texas History
Cherokeean Herald (Rusk, Tex.), Vol. 154, No. 34, Ed. 1 Wednesday, October 15, 2003
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
October 15, 2003
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
Cherokeean/Herald (Rusk, Tex.), Vol. 153, No. 47, Ed. 1 Wednesday, January 15, 2003
Weekly newspaper from Rusk, Texas that includes local, state and national news along with extensive advertising.
Date:
January 15, 2003
Creator:
Whitehead, Marie
Object Type:
Newspaper
System:
The Portal to Texas History
North Texas Daily (Denton, Tex.), Vol. 88, No. 2, Ed. 1 Wednesday, January 15, 2003
Daily student newspaper from the University of North Texas in Denton, Texas that includes local, state and campus news along with advertising.
Date:
January 15, 2003
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 234, Chapter 38
Bill introduced by the Texas House of Representatives relating to the payment of support for a child after the child's 18th birthday.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 641, Chapter 41
Bill introduced by the Texas House of Representatives relating to state policy and regulations regarding bison; providing penalties.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 1819, Chapter 77
Bill introduced by the Texas House of Representatives relating to an exclusion from unemployment compensation chargebacks based on a separation from employment caused by certain disasters.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 1820, Chapter 52
Bill introduced by the Texas House of Representatives relating to the exception of certain agricultural labor from unemployment compensation.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 200, Chapter 55
Bill introduced by the Texas Senate relating to authorizing certain hospital districts to pledge hospital system revenues and tax revenues to the payment of combination tax and revenue bonds and other obligations if the pledge is approved at an election, and related matters.
Date:
May 15, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 935, Chapter 42
Bill introduced by the Texas House of Representatives relating to the creation of magistrates in Comal County.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 970, Chapter 43
Bill introduced by the Texas House of Representatives relating to the donation by a county of salvage and surplus property to a civic or charitable organization.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, House Bill 988, Chapter 44
Bill introduced by the Texas House of Representatives relating to the composition of the First and Fourteenth courts of appeals districts.
Date:
May 15, 2003
Creator:
Texas. Legislature. House of Representatives.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 724, Chapter 59
Bill introduced by the Texas Senate relating to the settlement of certain claims against the Texas Department of Transportation.
Date:
May 15, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History
78th Texas Legislature, Regular Session, Senate Bill 752, Chapter 60
Bill introduced by the Texas Senate relating to joint negotiation by physicians and health benefit plans.
Date:
May 15, 2003
Creator:
Texas. Legislature. Senate.
Object Type:
Legislative Document
System:
The Portal to Texas History