11,105 Matching Results

Search Results

Note: All results matching your query require you to be a member of the UNT Community (you must be on campus or login with university credentials for access).

1,2-HOIQO--A highly versatile 1,2-HOPO analog

Description: A cyclic, bidentate hydroxamic acid binding unit based on an isoquinoline scaffold has been utilized for the synthesis of a hexadentate tripodal ligand based on the TREN backbone. This prototype for a new class of multidentate chelators forms mononuclear iron(III) complexes and one-dimensional coordination polymers with lanthanide(III) cations. The latter has been determined by single crystal X-ray analysis of the cerium species. The solid state structure in the monoclinic space group P2{sub 1}/c (C{sub 36}H{sub 34}CeN{sub 7}O{sub 11}, a = 12.341(2){angstrom}, b = 26.649(4){angstrom}, c = 10.621(2){angstrom}, {alpha} = {gamma} = 90{sup o}, {beta} = 96.753(3){sup o}, V = 3468.6(9) {angstrom}{sup 3}, Z = 4) exhibits a trigonal-dodecahedral environment around the cerium cation. The proof of concept for the versatility of the new scaffold has been shown by the modification of the crucial precursor 3-carboxyiso-coumarin through electrophilic aromatic substitutions to yield the corresponding chlorosulfonated and nitrated analogs.
Date: August 7, 2006
Creator: Seitz, Michael; Pluth, Michael D. & Raymond, Kenneth N.
Partner: UNT Libraries Government Documents Department


Description: A test stand for the investigation of 1+-n+ charge boosting using an ECR ion sources is currently being assembled at the Texas A&M Cyclotron Institute. The ultimate goal is to relate the charge-boosting of ions of stable species to possible charge-boosting of ions of radioactive species extracted from the diverse, low-charge-state ion sources developed for radioactive ion beams.
Date: April 7, 2006
Creator: May, Donald P.
Partner: UNT Libraries Government Documents Department

2 MV Injector as the Elise Front-End and as an Experimental Facility

Description: We report on progress in the preparation of the 2 MV Injector at LBNL as the front-end of Elise, and as a multi-purpose experimental facility for Heavy Ion Fusion beam dynamics studies. Recent advances on the performance and understanding of the injector are described, and some of the on-going experimental activities are summarized.
Date: December 7, 1999
Creator: Yu, S S; Eylon, S; Henestroza, E; Peters, C; Reginato, L; Tauschwitz, A et al.
Partner: UNT Libraries Government Documents Department

A 3.3 MJ, Rb + 1 driver design based on an integrated systems analysis

Description: A computer model for systems analysis of heavy ion drivers has been developed and used to evaluate driver designs for inertial fusion energy (IFE). The present work examines a driver for a close-coupled target design that requires less total beam energy but also smaller beam spots sizes than previous target designs. Design parameters and a cost estimate for a 160 beam, 3.3 MJ driver using rubidium ions (A = 85) are reported, and the sensitivity of the results to variations in selected design parameters is given.
Date: March 7, 2000
Creator: Meier, W R; Barnard, J J & Bangerter, R O
Partner: UNT Libraries Government Documents Department

A 6.3 T Bend Magnet for the Advanced Light Source

Description: The Advanced Light Source (ALS) is a 1.5 to 1.9 GeV high-brightness electron storage ring operating at Lawrence Berkeley Laboratory (LBL) that provides synchrotron radiation for a large variety of users. It Is proposed to replace three of the thirty six 1.5T, one meter long bend magnets with very sbort high-field superconductlng (SC) dipoles. These magnets would provide bend-magnet synchrotron radiation to six bcamlines with a critical energy of at least 6 keV that is much better suited for protein crystallography and other small-sample x-ray diffraction and adsorption studies, than is currently available at the ALS. The magnet design is described, including coil, yoke, magnetic field analysis, and cyrostat. A prototype magnet is under construction at LBL.
Date: June 7, 1995
Creator: Taylor, C. E. & Caspi, S.
Partner: UNT Libraries Government Documents Department

08-ERD-071 Final Report: New Molecular Probes and Catalysts for Bioenergy Research

Description: A major thrust in bioenergy research is to develop innovative methods for deconstructing plant cell wall polymers, such as cellulose and lignin, into simple monomers that can be biologically converted to ethanol and other fuels. Current techniques for monitoring a broad array of cell wall materials and specific degradation products are expensive and time consuming. To monitor various polymers and assay their breakdown products, molecular probes for detecting specific carbohydrates and lignins are urgently needed. These new probes would extend the limited biochemical techniques available, and enable realtime imaging of ultrastructural changes in plant cells. Furthermore, degradation of plant biomass could be greatly accelerated by the development of catalysts that can hydrolyze key cell wall polysaccharides and lignin. The objective of this project was to develop cheap and efficient DNA reagents (aptamers) used to detect and quantify polysaccharides, lignin, and relevant products of their breakdown. A practical goal of the research was to develop electrochemical aptamer biosensors, which could be integrated into microfluidic devices and used for high-throughput screening of enzymes or biological systems that degrade biomass. Several important model plant cell wall polymers and compounds were targeted for specific binding and purification of aptamers, which were then tested by microscopic imaging, circular dichroism, surface plasmon resonance, fluorescence anisotropy, and electrochemical biosensors. Using this approach, it was anticiated that we could provide a basis for more efficient and economically viable biofuels, and the technologies established could be used to design molecular tools that recognize targets sought in medicine or chemical and biological defense projects.
Date: March 7, 2011
Creator: Thelen, M P; Rowe, A A; Siebers, A K & Jiao, Y
Partner: UNT Libraries Government Documents Department

A 10,000 groove/mm multilayer coated grating for EUV spectroscopy

Description: Ultra-high spectral resolution in the EUV and soft x-ray energy ranges requires the use of very high line density gratings with optimal design resulting in use of a Blazed Multilayer Grating (BMG) structure. Here we demonstrate the production of near-atomically perfect Si blazed substrates with an ultra-high groove density (10,000 l/mm) together with the measured and theoretical performance of an Al/Zr multilayer coating on the grating. A 1st order absolute efficiency of 13percent and 24.6percent was achieved at incidence angles of 11o and 36o respectively. Cross-sectional TEM shows the effect of smoothing caused by the surface mobility of deposited atoms and we correlate this effect with a reduction in peak diffraction efficiency. This work shows the high performance that can be achieved with BMGs based on small-period anisotropic etched Si substrates, but also the constraints imposed by the surface mobility of deposited species.
Date: February 7, 2011
Creator: Voronov, Dmytro; Anderson, Erik; Cambie, Rossana; Cabrini, Stefano; Dhuey, Scott; Goray, Leonid et al.
Partner: UNT Libraries Government Documents Department

13.2 nm Table-Top Inspection Microscope for Extreme Ultraviolet Lithography Mask Defect Characterization

Description: We report on a reflection microscope that operates at 13.2-nm wavelength with a spatial resolution of 55{+-}3 nm. The microscope uses a table-top EUV laser to acquire images of photolithography masks in 20 seconds.
Date: April 7, 2009
Creator: Brizuela, F.; Wang, Y.; Brewer, C.; Pedaci, F.; Chao, W.; Anderson, E. et al.
Partner: UNT Libraries Government Documents Department


Description: A 15kJoule, Flash Lamp Power Conditioning Unit has been successfully designed, developed, and deployed in the National Ignition Facility (NIF) Preamplifier Modules (PAM). The primary design philosophy of this power conditioning unit (PCU) is safety, reliability, and manufacturability. Cost reduction over commercially equivalent systems was also achieved through an easily manufactured packaging design optimized to meet NIF requirements. While still maintaining low cost, the PCU design includes a robust control system, fault diagnostic system, and safety features. The pulsed power design includes 6 PFN modules, each including a dual series injection trigger transformer, that drive a total of 12 flash lamp loads. The lamps are individually triggered via a 20kV pulse produced by a 1kV, MCT switched capacitive discharge unit on the primary side of the trigger transformer. The remote control interface includes an embedded controller that captures flash lamp current wave forms and fault status for each shot. The embedded controller provides the flexibility of remotely adjusting both the main drive voltage from 1.6 to 2.5 kV and the trigger voltage from 0 to 20 kV.
Date: August 7, 2007
Creator: James, G; Merritt, B; Dreifuerst, G & Strickland, S
Partner: UNT Libraries Government Documents Department

20,000 KW Nuclear Power Plant Study for United States Atomic Energy Commission

Description: Introduction: In September of 156, Gilbert Associates, Inc., entered into a contract with the United States of America, acting through the United States Atomic Energy Commission, for the study and preliminary design of a nuclear power plant being considered for integration into a central station power system at an overseas site.
Date: July 7, 1957
Creator: Gilbert Associates, Inc.
Partner: UNT Libraries Government Documents Department

25 Can Verification Report for the LLNL Plutonium Packaging System (PuPS)

Description: This document reports the results of the 25 Can Verification Run. The 25 Can Verification Run was performed as outlined in Section 1.d of SRS Acceptance Criteria (Reference 1). The run was performed over the period of February 16 to the 28, 2001. Each of these cans was welded with a dummy Inner Can containing about 5 kg of surrogate material. The cans were then analyzed using radiography and metallography of samples taken at four locations of the weld. The radiographs were examined for porosity. The micrographs of the metallurgical samples were examined for porosity, cracks, and lack of fusion. The results were reviewed by Derrill Rikard (a level 3 inspector at LLNL) and by Ken Durland (a level 3 inspector from WSRC). These reviews did not find anything of concern. Therefore we are submitting these results to SRS for concurrence.
Date: May 7, 2001
Creator: Riley, D C & Dodson, K E
Partner: UNT Libraries Government Documents Department

100 Areas technical activities report - physics, December 1946

Description: This report summarizes physics experiments carried out in different parts of the 100 area at Hanford during December, 1946. This included work on the D pile, F pile, and experiments aimed at studying the irradiation properties of graphite and metal samples exposed to different radiation environments. Pile tests included reactivity tests, calibrations of control rods, and power coefficient tests.
Date: January 7, 1947
Creator: Montgomery, E. B.
Partner: UNT Libraries Government Documents Department

225-B Pool Cell 5 Liner Leak Investigation

Description: This document describes the actions taken to confirm and respond to a very small (0.046 ml/min) leak in the stainless steel liner of Hanford`s Waste Encapsulation and Storage Facility (WESF) storage pool cell 5 in Building 225-B. Manual level measurements confirmed a consistent weekly accumulation of 0.46 liters of water in the leak detection grid sump below the pool cell 5 liner. Video inspections and samples point to the capsule storage pool as the source of the water. The present leak rate corresponds to a decrease of only 0.002 inches per week in the pool cell water level, and consequently does not threaten any catastrophic loss of pool cell shielding and cooling water. The configuration of the pool cell liner, sump system, and associated risers will limit the short-term consequences of even a total liner breach to a loss of 1 inch in pool cell level. The small amount of demineralized pool cell water which has been in contact with the concrete structure is not enough to cause significant structural damage. However, ongoing water-concrete interaction increases. The pool cell leak detection sump instrumentation will be modified to improve monitoring of the leak rate in the future. Weekly manual sump level measurements continue in the interim. Contingency plans are in place to relocate the pool cell 5 capsules if the leak worsens.
Date: June 7, 1996
Creator: Rasmussen, J.H., Westinghouse Hanford
Partner: UNT Libraries Government Documents Department

300 Area Disturbance Report

Description: The objective of this study was to define areas of previous disturbance in the 300 Area of the U.S. Department of Energy (DOE) Hanford Site to eliminate these areas from the cultural resource review process, reduce cultural resource monitoring costs, and allow cultural resource specialists to focus on areas where subsurface disturbance is minimal or nonexistent. Research into available sources suggests that impacts from excavations have been significant wherever the following construction activities have occurred: building basements and pits, waste ponds, burial grounds, trenches, installation of subsurface pipelines, power poles, water hydrants, and well construction. Beyond the areas just mentioned, substrates in the' 300 Area consist of a complex, multidimen- sional mosaic composed of undisturbed stratigraphy, backfill, and disturbed sediments; Four Geographic Information System (GIS) maps were created to display known areas of disturbance in the 300 Area. These maps contain information gleaned from a variety of sources, but the primary sources include the Hanford GIS database system, engineer drawings, and historic maps. In addition to these maps, several assumptions can be made about areas of disturbance in the 300 Area as a result of this study: o o Buried pipelines are not always located where they are mapped. As a result, cultural resource monitors or specialists should not depend on maps depicting subsurface pipelines for accurate locations of previous disturbance. Temporary roads built in the early 1940s were placed on layers of sand and gravel 8 to 12 in. thick. Given this information, it is likely that substrates beneath these early roads are only minimally disturbed. Building foundations ranged from concrete slabs no more than 6 to 8 in. thick to deeply excavated pits and basements. Buildings constructed with slab foundations are more numerous than may be expected, and minimally disturbed substrates may be expected in these locations. Historic ...
Date: January 7, 1999
Creator: Hale, L. L.; Wright, M. K. & Cadoret, N. A.
Partner: UNT Libraries Government Documents Department

300 Area Liquid Effluent Facilities (LEF) Authorization Envelope

Description: The purpose of this document is to establish the facility Authorization Envelope (AE) for the 300 Liquid Effluent Facilities (LEP )Project and identify the requirements related to the maintenance of the AE as Specified in HNF-PRO-2701, Authorization Envelope and Authorization Agreement. The 300 LEF Project consists of two separate facilities operating under one management organization. They are the 310 Facility and the 340 Facility. The AE documents the limits of operations for all 300 LEF Project activities.
Date: April 7, 2000
Creator: WRIGHT, E.J. & STORDEUR, R.T.
Partner: UNT Libraries Government Documents Department

340 Representative sampling verification tank sampling and analysis plan

Description: This Sampling and Analysis Plan contains requirements for characterizing the 340 vault tank 1. The objective of the sampling and characterization is to determine if the tank is homogeneous when agitated and which sampling method provides the most representative sample. A secondary objective is to collect and characterize solid samples.
Date: August 7, 1996
Creator: Olander, A.R., Westinghouse Hanford
Partner: UNT Libraries Government Documents Department

401(k) Plans and Retirement Savings: Issues for Congress

Description: From Summary: "This report describes seven major policy issues with respect to defined contribution plans include: 1. access to employer-sponsored retirement plans; 2. participation in employer-sponsored plans; 3. contribution rates; 4. investment choices; 5. fee disclosure; 6. leakage from retirement savings; converting retirement savings into income."
Date: January 7, 2011
Creator: Topoleski, John J.
Partner: UNT Libraries Government Documents Department

401(K) Plans: Labor and IRS Could Improve the Rollover Process for Participants

Description: A letter report issued by the Government Accountability Office with an abstract that begins "The current rollover process favors distributions to individual retirement accounts (IRA). Waiting periods to roll into a new employer plan, complex verification procedures to ensure savings are tax-qualified, wide divergences in plans' paperwork, and inefficient practices for processing rollovers make IRA rollovers an easier and faster choice, especially given that IRA providers often offer assistance to plan participants when they roll their savings into an IRA. The Department of Labor (Labor) and the Internal Revenue Service (IRS) provide oversight and guidance for this process generally and can take steps to make plan-to-plan rollovers more efficient, such as reducing the waiting period to roll over into a 401(k) plan and improving the asset verification process. Such actions could help make staying in the 401(k) plan environment a more viable option, allowing participants to make distribution decisions based on their financial circumstances rather than on convenience."
Date: March 7, 2013
Creator: United States. Government Accountability Office.
Partner: UNT Libraries Government Documents Department

450/sup 0/F step transient thermal analysis of the LOFT pressurizer surge and spray line piping

Description: The LOFT pressurizer spray and surge line piping was analyzed for a 450/sup 0/F step change in fluid temperature. This transient was chosen to conservatively represent several pressurizer operating transients that had not previously been analyzed. These include temperature transients resulting from a 300/sup 0/F ..delta..T between pressurizer temperature and cold leg temperature, injection of a cooled (70/sup 0/F) slug of stagnant fluid into the hot (540/sup 0/F) spray line piping, and inflow of 100/sup 0/F primary coolant system water into the hot (480/sup 0/F) surge line piping.
Date: July 7, 1977
Creator: Tolan, B.J.
Partner: UNT Libraries Government Documents Department

527 Organizations: How the Differences in Tax and Election Laws Permit Certain Organizations to Engage in Issue Advocacy without Public Disclosure and Proposals for Change

Description: This report compares the tax and election laws relating to political organizations and political committees prior to the enactment of P.L. 106-230 in an attempt to highlight the differences between them, and discusses some of the proposals in the 106th Congress to require additional reporting by organizations engaging in political activities. This report does not address the taxation of other tax-exempt organizations making political expenditures taxable under IRC § 527. For developments after the enactment of P.L. 106-230, please see CRS Report RS20650, 527 Organizations: Reporting Requirements Imposed on Political Organizations after the Enactment of P.L. 106-230.
Date: September 7, 2000
Creator: Morris, Marie B.
Partner: UNT Libraries Government Documents Department

527 Organizations: How the Differences in Tax and Election Laws Permit Certain Organizations to Engage in Issue Advocacy without Public Disclosure and Proposals for Change

Description: Virtually all political organizations are "section 527" political organizations, which means that they are tax-exempt. 527 organizations are created to influence the election or defeat of public officials. This report compares the tax and election laws relating to political organizations and political committees prior to the enactment of P.L. 106-230 in an attempt to highlight the differences between them, and discusses some of the proposals in the 106th Congress to require additional reporting by organizations engaging in political activities. This report does not address the taxation of other tax-exempt organizations making political expenditures taxable under IRC § 527.
Date: September 7, 2000
Creator: Morris, Marie B.
Partner: UNT Libraries Government Documents Department