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(2,2-Bipyridyl)bis(eta5-1,2,3,4,5-pentamethylcyclopentadienyl)Strontium(II)
In the title compound, the Sr-N distances are 2.624 (3) and 2.676 (3) Angstroms. The Sr-centroid distances are 2.571 and 2.561 Angstroms. The N-C-C-N torsion angle in the bipyridine ligand is 2.2 (4){sup o}. Interestingly, the bipyridine ligand is tilted. The angle between the plane defined by Sr1, N1 and N2 and the plane defined by the 12 atoms of the bipyridine ligand is 10.7{sup o}.
Date:
July 3, 2008
Creator:
Kazhdan, Daniel; Kazhdan, Daniel; Hu, Yung-Jin; Kokai, Akos; Levi, Zerubba & Rozenel, Sergio
Object Type:
Article
System:
The UNT Digital Library
A 12 GHz RF Power Source for the CLIC Study
The CLIC RF frequency has been changed in 2008 from the initial 30 GHz to the European X-band 11.9942 GHz permitting beam independent power production using klystrons for CLIC accelerating structure testing. A design and fabrication contract for five klystrons at that frequency has been signed by different parties with SLAC. France (IRFU, CEA Saclay) is contributing a solid state modulator purchased in industry and specific 12 GHz RF network components to the CLIC study. RF pulses over 120 MW peak at 230 ns length will be obtained by using a novel SLED-I type pulse compression scheme designed and fabricated by IAP, Nizhny Novgorod, Russia. The X-band power test stand is being installed in the CLIC Test Facility CTF3 for independent structure and component testing in a bunker, but allowing, in a later stage, for powering RF components in the CTF3 beam lines. The design of the facility, results from commissioning of the RF power source and the expected performance of the Test Facility are reported.
Date:
July 3, 2012
Creator:
Schirm, Karl; Curt, Stephane; Dobert, Steffen; McMonagle, Gerard; Rossat, Ghislain; Syratchev, Igor et al.
Object Type:
Article
System:
The UNT Digital Library
300 Area Building Retention Evaluation Mitigation Plan
Evaluate the long-term retention of several facilities associated with the PNNL Capability Replacement Laboratory and other Hanfor mission needs. WCH prepared a mitigation plan for three scenarios with different release dates for specific buildings. The evaluations present a proposed plan for providing utility services to retained facilities in support of a long-term (+20 year) lifespan in addition to temporary services to buildings with specified delayed release dates.
Date:
July 3, 2007
Creator:
McBride, D. J.
Object Type:
Report
System:
The UNT Digital Library
500 MW X-Band RF System of a 0.25 GeV Electron LINAC for Advanced Compton Scattering Source Application
A Mono-Energetic Gamma-Ray (MEGa-Ray) Compton scattering light source is being developed at LLNL in collaboration with the SLAC National Accelerator Laboratory. The electron beam for the Compton scattering interaction will be generated by a X-band RF gun and a X-band LINAC at the frequency of 11.424 GHz. High power RF in excess of 500 MW is needed to accelerate the electrons to energy of 250 MeV or greater for the interaction. Two high power klystron amplifiers, each capable of generating 50 MW, 1.5 msec pulses, will be the main high power RF sources for the system. These klystrons will be powered by state of the art solid-state high voltage modulators. A RF pulse compressor, similar to the SLED II pulse compressor, will compress the klystron output pulse with a power gain factor of five. For compactness consideration, we are looking at a folded waveguide setup. This will give us 500 MW at output of the compressor. The compressed pulse will then be distributed to the RF gun and to six traveling wave accelerator sections. Phase and amplitude control are located at the RF gun input and additional control points along the LINAC to allow for parameter control during operation. This …
Date:
July 3, 2012
Creator:
Chu, Tak Sum; Anderson, Scott; Barty, Christopher; Gibson, David; Hartemann, Fred; Marsh, Roark et al.
Object Type:
Article
System:
The UNT Digital Library
1999 Federal energy saver showcases
Sixteen-page booklet containing case studies of the nine Federal Energy Saver Showcase award recipients for 1999.
Date:
July 3, 2000
Creator:
Nahan, R.
Object Type:
Book
System:
The UNT Digital Library
2000 Census: Refinements to Full Count Review Program Could Improve Future Data Quality
A letter report issued by the General Accounting Office with an abstract that begins "To ensure the completeness and accuracy of the 2000 census data, Bureau of the Census analysts were to identify, investigate, and document suspected data discrepancies or issues to clear census data files and products for subsequent processing or public release. They were to determine whether and how to correct the data by weighing quality improvements against time and budget constraints. Because the bureau lacked sufficient staff to conduct a full count review on its own, it contracted out some of the work to members of the Federal-State Cooperative Program for Population Estimates (FSCPE). FSCPE documented 1,402 data issues, 29 percent of the 4,809 issues identified by both FSCPE and bureau analysts during the full count review. Of the 4,809 issues, 1,599 dealt with "group quarters," where counts for prisons, nursing homes, dormitories, and other group living facilities differed from what analysts expected. Of the 1,599 group quarters issues, FSCPE identified 567. Discrepancies relating to housing unit counts, population data, and demographic characteristics accounted for 1,150 issues, 375 of which were identified by FSCPE. Overall, of the 4,809 issues identified during review, 4,267 were not subjected to …
Date:
July 3, 2002
Creator:
United States. General Accounting Office.
Object Type:
Report
System:
The UNT Digital Library
The 2002 Farm Bill: Overview and Status
The Federal Agriculture Improvement and Reform, or FAIR, Act of 1996 (commonly known as the "farm bill"), which was due to expire in 2002, is expected to be extended for another six years when President Bush signs the bill into law. This report discusses the provisions of the new "farm bill," including the federal spending involved.
Date:
July 3, 2002
Creator:
Becker, Geoffrey S. & Womach, Jasper
Object Type:
Report
System:
The UNT Digital Library
The 2008 Farm Bill: Analysis of Tax-Related Conservation Reserve Program Proposals
This report discusses the 2008 Farm Bill, which contains two tax-related proposals for the Conservation Reserve Program.
Date:
July 3, 2008
Creator:
Pettit, Carol A.
Object Type:
Report
System:
The UNT Digital Library
ACA: A Brief Overview of the Law, Implementation, and Legal Challenges
This report summarizes the Affordable Care Act (ACA) and the legal challenges it has faced. The report contains information on various lawsuits due to the ACA and provides the reasoning behind them as Congress violating its enumerated powers in the constitution. Moreover, the report covers the challenges of implementing the law.
Date:
July 3, 2012
Creator:
Redhead, C. Stephen; Chaikind, Hinda; Fernandez, Bernadette & Staman, Jennifer
Object Type:
Report
System:
The UNT Digital Library
Acceleration of high-pressure-ratio single-spool turbojet engine as determined from component performance characteristics 2: effect of compressor interstage air bleed
Report presenting an analytical investigation to determine the effect of compressor interstage air bleed with the use of constant-area bleed ports on the acceleration characteristics of a typical high-pressure-ratio single-spool turbojet engine. Constant-area interstage bleed, properly located, gave smaller acceleration times than variable-area compressor exit bleed. Results regarding acceleration with interstage bleed, acceleration using constant-area interstage bleed in combination with compressor outlet bleed, variable-area interstage bleed, and comparison of acceleration modes are provided.
Date:
July 3, 1953
Creator:
Rebeske, John J., Jr. & Dugan, James F., Jr.
Object Type:
Report
System:
The UNT Digital Library
Advanced X-Band Test Accelerator for High Brightness Electron and Gamma Ray Beams
In support of Compton scattering gamma-ray source efforts at LLNL, a multi-bunch test stand is being developed to investigate accelerator optimization for future upgrades. This test stand will enable work to explore the science and technology paths required to boost the current 10 Hz monoenergetic gamma-ray (MEGa-Ray) technology to an effective repetition rate exceeding 1 kHz, potentially increasing the average gamma-ray brightness by two orders of magnitude. Multiple bunches must be of exceedingly high quality to produce narrow-bandwidth gamma-rays. Modeling efforts will be presented, along with plans for a multi-bunch test stand at LLNL. The test stand will consist of a 5.5 cell X-band rf photoinjector, single accelerator section, and beam diagnostics. The photoinjector will be a high gradient standing wave structure, featuring a dual feed racetrack coupler. The accelerator will increase the electron energy so that the emittance can be measured using quadrupole scanning techniques. Multi-bunch diagnostics will be developed so that the beam quality can be measured and compared with theory. Design will be presented with modeling simulations, and layout plans.
Date:
July 3, 2012
Creator:
Marsh, Roark; Anderson, Scott; Barty, Christopher; Chu, Tak Sum; Ebbers, Chris; Gibson, David et al.
Object Type:
Article
System:
The UNT Digital Library
The aerodynamic characteristics at transonic speeds of an all-movable, tapered, 45 degrees sweptback, aspect-ratio-4 tail surface deflected about a skewed hinge axis
From Introduction: "The purpose of the present paper was to determine whether the characteristics about a skewed axis could be predicted from data about the normal angle-of-attack axis, and whether such a configuration offered any aerodynamic advantages over the conventional hinge location normal to the pane of symmetry."
Date:
July 3, 1952
Creator:
Hammond, Alexander D. & Watson, James M.
Object Type:
Report
System:
The UNT Digital Library
Africa: U.S. Foreign Assistance Issues
This report discusses the issue of U.S. economic assistance to sub-Saharan Africa, highlighting the importance of continued assistance in light of U.S. national security and also various U.S.-led efforts to promote reform amongst African citizens themselves. U.S. assistance finds its way to Africa through a variety of channels, including the USAID-administered DA program, food aid programs, and indirect aid provided through international financial institutions and the United Nations.
Date:
July 3, 2003
Creator:
Copson, Raymond W.
Object Type:
Report
System:
The UNT Digital Library
Aging Infrastructure: Dam Safety
To help inform discussions on the federal role in dam safety, this report provides background information on the nation’s dam safety activities and funding mechanisms.
Date:
July 3, 2006
Creator:
Lane, Nic
Object Type:
Report
System:
The UNT Digital Library
Agricultural Disaster Assistance
Report containing a description of recent developments in weather and U. S. policy. as well as an overview of current and expired USDA disaster assistance programs. An appendix reviews the recent history of emergency supplemental farm disaster assistance and administrative actions by USDA.
Date:
July 3, 2013
Creator:
Shields, Dennis A.
Object Type:
Report
System:
The UNT Digital Library
Agricultural Disaster Assistance
This report discusses the ongoing major USDA disaster programs designed to help crop producers recover from the financial effects of natural disasters — federal crop insurance, noninsured assistance program (NAP) payments, and emergency disaster loans.
Date:
July 3, 2008
Creator:
Chite, Ralph M.
Object Type:
Report
System:
The UNT Digital Library
Agricultural Disaster Assistance
The U.S. Department of Agriculture (USDA) offers several permanently authorized programs to help farmers recover financially from a natural disaster, including federal crop insurance, the noninsured assistance program (NAP), and emergency disaster loans. This report outlines the various agricultural disaster assistance appropriations included in the FY2007 Iraq war supplemental appropriations act; the Food, Conservation, and Energy Act of 2008; the 2008 farm bill; and the FY2008 Supplemental Appropriations Act.
Date:
July 3, 2008
Creator:
Chite, Ralph M.
Object Type:
Report
System:
The UNT Digital Library
Algeria: Current Issues
This report examines the current state of Algeria, including the country's associations with terrorism, despite steady decreases of domestic terrorism; the lessening in power of the Algerian military; and growing oil revenues.
Date:
July 3, 2008
Creator:
Migdalovitz, Carol
Object Type:
Report
System:
The UNT Digital Library
Algorithm refinement for fluctuating hydrodynamics
This paper introduces an adaptive mesh and algorithmrefinement method for fluctuating hydrodynamics. This particle-continuumhybrid simulates the dynamics of a compressible fluid with thermalfluctuations. The particle algorithm is direct simulation Monte Carlo(DSMC), a molecular-level scheme based on the Boltzmann equation. Thecontinuum algorithm is based on the Landau-Lifshitz Navier-Stokes (LLNS)equations, which incorporate thermal fluctuations into macroscopichydrodynamics by using stochastic fluxes. It uses a recently-developedsolver for LLNS, based on third-order Runge-Kutta. We present numericaltests of systems in and out of equilibrium, including time-dependentsystems, and demonstrate dynamic adaptive refinement by the computationof a moving shock wave. Mean system behavior and second moment statisticsof our simulations match theoretical values and benchmarks well. We findthat particular attention should be paid to the spectrum of the flux atthe interface between the particle and continuum methods, specificallyfor the non-hydrodynamic (kinetic) time scales.
Date:
July 3, 2007
Creator:
Williams, Sarah A.; Bell, John B. & Garcia, Alejandro L.
Object Type:
Article
System:
The UNT Digital Library
Alpha-Decay Studies in the Heavy Element Region
Thesis describing a research conducted to extend observations on nuclear energy levels and how they effect the nucleus itself, and an investigation on the gamma rays associated for the even-even isotopes and to obtain additional data for the oddmass neclei in the hope that more regularities will become apparent for that class of nuclides.
Date:
July 3, 1956
Creator:
Hummel, John Philip
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Altitude-Chamber Performance of British Roll-Royce Nene II Engine 4: Effect of Operational Variables on Temperature Distribution at Combustion-Chamber Outlets
"Temperature surveys were made at the combustion-chamber outlets of a British Rolls-Royce Nene II engine. The highest mean nozzle-vane and mean gas temperatures were found to occur at a radius approximately 75% of the nozzle-vane length from the inner ring of the nozzle-vane assembly. Variations in engine speed, jet-nozzle area, simulated altitude, and simulated flight speed altered the temperature level but did not materially affect the pattern of radial temperature distribution" (p. 1).
Date:
July 3, 1950
Creator:
Huntley, Sidney C.
Object Type:
Report
System:
The UNT Digital Library
Amtrak Reauthorization: S. 738
The report discusses the bill that was introduced on May 14,1997, by the chairman of the Senate Commerce Committee, Subcommittee on surface Transportation and Merchant Marine, and the bill was referred to that committee.
Date:
July 3, 1997
Creator:
Thompson, Stephen J.
Object Type:
Report
System:
The UNT Digital Library
Angular Distribution of Particles Emerging from a Diffusive Region and its Implications for the Fleck-Canfield Random Walk Algorithm for Implicit Monte Carlo Radiation Transport
We present various approximations for the angular distribution of particles emerging from an optically thick, purely isotropically scattering region into a vacuum. Our motivation is to use such a distribution for the Fleck-Canfield random walk method [1] for implicit Monte Carlo (IMC) [2] radiation transport problems. We demonstrate that the cosine distribution recommended in the original random walk paper [1] is a poor approximation to the angular distribution predicted by transport theory. Then we examine other approximations that more closely match the transport angular distribution.
Date:
July 3, 2000
Creator:
Cooper, M. A.
Object Type:
Report
System:
The UNT Digital Library
Animal-Trap.
Patent for Improvements in Animal Traps. This trap is a "self and everset trap" (lines 11-12) with the primary purpose of creating a trap that is "efficient of operation, economical of construction, and sanitary" (lines 14-15).
Date:
July 3, 1917
Creator:
Burgett, William Matthews
Object Type:
Patent
System:
The Portal to Texas History