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International Forestry Issues in Climate Change Bills: Comparison of Provisions of S. 1733 and H.R. 2454
This report discusses the allowances and emissions reductions from reduce emissions from deforestation and forest degradation (REDD).
Date:
December 22, 2009
Creator:
Sheikh, Pervaze A. & Gorte, Ross W.
Object Type:
Report
System:
The UNT Digital Library
Investigating the possibility of a human component in various Pacific Decadal Oscillation indices
None
Date:
December 22, 2009
Creator:
Bonfils, C & Santer, B
Object Type:
Article
System:
The UNT Digital Library
Navy Aegis Cruiser and Destroyer Modernization: Background and Issues for Congress
The Navy has begun a multi-billion dollar program to modernize its 84 existing Aegis cruisers and destroyers over a period of more than 20 years. This report explores this program in detail, including the reasons for the program and the oversight issues it poses for Congress.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy CG(X) Cruiser Program: Background, Oversight Issues, and Options for Congress
The Navy is currently developing technologies and studying design options for a planned new cruiser called the CG(X). This report explores the reasoning behind the development of these cruisers, the budgetary actions taking place to enable their development, selected technical specifics of their design, and various other information relating to defense procurement costs.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy F/A-18E/F and EA-18G Aircraft Procurement and Strike Fighter Shortfall: Background and Issues for Congress
This report discusses the Navy's proposed FY2011 budget requests (about $1.8 billion) for the procurement of 22 F/A- 18E/F Super Hornet strike fighters and about $1.0 billion for the procurement of 12 EA-18G Growler electric attack aircraft.
Date:
December 22, 2009
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
Navy Force Structure and Shipbuilding Plans: Background and Issues for Congress
This report provides background information and presents potential issues for Congress concerning the Navy's ship force-structure goals and shipbuilding plans. Decisions that Congress makes on Navy shipbuilding programs can substantially affect Navy capabilities and funding requirements, and the U.S. shipbuilding industrial base.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy Ford (CVN-78) Class Aircraft Carrier Program: Background and Issues for Congress
This report provides background information and potential oversight issues for Congress on the CVN-78 program, which includes the CVN-78 and CVN-79 as the first two ships in the Navy's new Gerald R. Ford (CVN- 78) class of nuclear-powered aircraft carriers (CVNs).
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy Littoral Combat Ship (LCS) Program: Background, Issues, and Options for Congress
This report discusses current issues for Congress concerning the Littoral Combat Ship (LCS) program including the program's mission modules, the combat survivability of the LCS, hull cracking and engine problems on LCS-1, and corrosion on LCS-2. The LCS is a relatively inexpensive Navy surface combatant equipped with modular "plug-and-fight" mission packages.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy LPD-17 Amphibious Ship Procurement: Background, Issues, and Options for Congress
This report discusses the Navy's shipbuilding plan that calls for procuring an 11th and final San Antonio (LPD-17) class amphibious ship in FY2011. This report discusses the procurement cost estimates of this ship, as well as related issues for Congress.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Navy Virginia (SSN-774) Class Attack Submarine Procurement: Background and Issues for Congress
The Navy has been procuring Virginia (SSN-774) class nuclear-powered attack submarines (SSNs) at a rate of one per year for the past several years, and a total of 11 boats have been procured through FY2009. This report discusses the Navy's proposed FY2010 budget, which requests $1,964.3 million in procurement funding to complete the procurement cost of a 12th Virginia-class boats.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Private Security Contractors in Iraq and Afghanistan: Legal Issues
This report discusses the legal framework that applies to private security contractors (PSCs) in Iraq and Afghanistan. The report follows up with a discussion of jurisdiction over PSC personnel in U.S. courts, identifying possible means of prosecuting contractor personnel who are accused of violating the law overseas in the context of U.S. military operations. Finally, the report briefly discusses the possible implication of the roles of private security contractors with respect to inherently governmental functions.
Date:
December 22, 2009
Creator:
Elsea, Jennifer K.
Object Type:
Report
System:
The UNT Digital Library
Production and decay of element 114: high cross sections and the new nucleus 277Hs
The fusion-evaporation reaction {sup 244}Pu({sup 48}Ca,3-4n){sup 288,289}114 was studied at the new gas-filled recoil separator TASCA. Thirteen correlated decay chains were observed and assigned to the production and decay of {sup 288,289}114. At a compound nucleus excitation energy of E* = 39.8-43.9 MeV, the 4n evaporation channel cross section was 9.8{sub -3.1}{sup +3.9} pb. At E* = 36.1-39.5 MeV, that of the 3n evaporation channel was 8.0{sub -4.5}{sup +7.4} pb. In one of the 3n evaporation channel decay chains, a previously unobserved {alpha} branch in {sup 281}Ds was observed (probability to be of random origin from background: 0.1%). This {alpha} decay populated the new nucleus {sup 277}Hs, which decayed by spontaneous fission after a lifetime of 4.5 ms.
Date:
December 22, 2009
Creator:
Dullmann, Ch. E.; Schadel, M.; Yakushev, A.; Turler, A.; Eberhardt, K.; Kratz, J. V. et al.
Object Type:
Article
System:
The UNT Digital Library
Reaction of the C2H radical with 1-butyne (C4H6): Low Temperature Kinetics and Isomer-Specific Product Detection
The rate coefficient for the reaction of the ethynyl radical (C{sub 2}H) with 1-butyne (H-C{triple_bond}C-CH{sub 2}-CH{sub 3}) is measured in a pulsed Laval nozzle apparatus. Ethynyl radicals are formed by laser photolysis of acetylene (C{sub 2}H{sub 2}) at 193 nm and detected via chemiluminescence (C{sub 2}H + O{sub 2} {yields} CH (A{sup 2}{Delta}) + CO{sub 2}). The rate coefficients are measured over the temperature range of 74-295 K. The C{sub 2}H + 1-butyne reaction exhibits no barrier and occurs with rate constants close to the collision limit. The temperature dependent rate coefficients can be fit within experimental uncertainties by the expression k = (2.4 {+-} 0.5) x 10{sup -10} (T/295 K)-(0.04 {+-} 0.03) cm{sup 3} molecule{sup -1}s{sup -1}. Reaction products are detected at room temperature (295 K) and 533 Pa using a Multiplexed Photoionization Mass Spectrometer (MPIMS) coupled to the tunable VUV synchrotron radiation from the Advanced Light Source at the Lawrence Berkeley National Laboratory. Two product channels are identified for this reaction: m/z = 64 (C{sub 5}H{sub 4}) and m/z = 78 (C{sub 6}H{sub 6}) corresponding to the CH{sub 3}- and H-loss channels, respectively. Photoionization efficiency (PIE) curves are used to analyze the isomeric composition of both product channels. …
Date:
December 22, 2009
Creator:
Soorkia, Satchin; Trevitt, Adam J.; Selby, Talitha M.; Osborn, David L.; Taatjes, Craig A.; Wilson, Kevin R. et al.
Object Type:
Article
System:
The UNT Digital Library
Sea-Based Ballistic Missile Defense-- Background and Issues for Congress
This report discusses the changing role and finance of sea-based systems in U.S. ballistic missile defense (BMD). Decisions that Congress reaches on this issue could affect U.S. BMD capabilities and funding requirements; the size, capabilities, and operational patterns of the Navy and the other services; and the shipbuilding industrial base.
Date:
December 22, 2009
Creator:
O'Rourke, Ronald
Object Type:
Report
System:
The UNT Digital Library
Sensor systems for the Altair Lunar Lander:
The Altair Lunar Lander will enable astronauts to learn to live and work on the moon for extended periods of time, providing the experience needed to expand human exploration farther into the solar system. My overriding recommendation: Use independent and complementary [sometimes referred to as 'orthogonal'] techniques to disambiguate confounding/interfering signals. E.g.: a mass spectrometer ['MS'], which currently serves as a Majority Constituent Analyzer ['MCA'] can be very valuable in detecting the presence of a gaseous specie, so long as it falls on a mass-to-charge ratio ['m/z'] that is not already occupied by a majority constituent of cabin air. Consider the toxic gas, CO. Both N{sub 2} and CO have parent peaks of m/z = 28, and CO{sub 2} has a fragment peak at m/z = 28 [and at 16 and 12], so the N{sub 2} and CO{sub 2} m/z=28 signals could mask low, but potentially-dangerous levels of CO. However there are numerous surface-sensitive CO detectors, as well as tunable-diode-laser-based CO sensors that could provide independent monitoring of CO. Also, by appending a gas chromatograph ['GC'] as the front-end sample processer, prior to the inlet of the MS, one can rely upon the GC to separate CO from N{sub 2} …
Date:
December 22, 2009
Creator:
Mariella, Raymond, Jr.
Object Type:
Report
System:
The UNT Digital Library
VH-71/VXX Presidential Helicopter Program: Background and Issues for Congress
This report discusses the VH-71 program, which is intended to provide 23 new presidential helicopters to replace the current fleet of 19 aging presidential helicopters.
Date:
December 22, 2009
Creator:
Gertler, Jeremiah J.
Object Type:
Report
System:
The UNT Digital Library
V-22 Osprey Tilt-Rotor Aircraft: Background and Issues for Congress
This report discusses background information on the V-22 Osprey Tilt-Rotor Aircraft, as well as procurement and related oversight issues for Congress.
Date:
December 22, 2009
Creator:
Gertler, Jeremiah
Object Type:
Report
System:
The UNT Digital Library
3D Sedimentological and Geophysical Studies of Clastic Reservoir Analogs: Facies Architecture, Reservoir Properties, and Flow Behavior Within Delta Front Facies Elements of the Cretaceous Wall Creek Member, Frontier Formation, Wyoming
Significant volumes of oil and gas occur in reservoirs formed by ancient river deltas. This has implications for the spatial distribution of rock types and the variation of transport properties. A between mudstones and sandstones may form baffles that influence productivity and recovery efficiency. Diagenetic processes such as compaction, dissolution, and cementation can also alter flow properties. A better understanding of these properties and improved methods will allow improved reservoir development planning and increased recovery of oil and gas from deltaic reservoirs. Surface exposures of ancient deltaic rocks provide a high-resolution view of variability. Insights gleaned from these exposures can be used to model analogous reservoirs, for which data is sparser. The Frontier Formation in central Wyoming provides an opportunity for high-resolution models. The same rocks exposed in the Tisdale anticline are productive in nearby oil fields. Kilometers of exposure are accessible, and bedding-plane exposures allow use of high-resolution ground-penetrating radar. This study combined geologic interpretations, maps, vertical sections, core data, and ground-penetrating radar to construct geostatistical and flow models. Strata-conforming grids were use to reproduce the observed geometries. A new Bayesian method integrates outcrop, core, and radar amplitude and phase data. The proposed method propagates measurement uncertainty and yields …
Date:
December 21, 2009
Creator:
White, Christopher D.
Object Type:
Report
System:
The UNT Digital Library
Bridging the Gap in the Chemical Thermodynamic Database for Nuclear Waste Repository: Studies of the Effect of Temperature on Actinide Complexation
Recent results of thermodynamic studies on the complexation of actinides (UO{sub 2}{sup 2+}, NpO{sub 2}{sup +} and Pu{sup 4+}) with F{sup -}, SO{sub 4}{sup 2-} and H{sub 2}PO{sub 4}{sup -}/HPO{sub 4}{sup 2-} at elevated temperatures are reviewed. The data indicate that, for all systems except the 1:1 complexation of Np(V) with HPO{sub 4}{sup 2-}, the complexation of actinides is enhanced by the increase in temperature. The enhancement is primarily due to the increase in the entropy term (T{Delta}S) that exceeds the increase in the enthalpy ({Delta}H) as the temperature is increased. These data bridge the gaps in the chemical thermodynamic database for nuclear waste repository where the temperature could remain significantly higher than 25 C for a long time after the closure of the repository.
Date:
December 21, 2009
Creator:
Rao, Linfeng; Tian, Guoxin; Xia, Yuanxian; Friese, Judah I.; Zanonato, PierLuigi & Di Bernardo, Plinio
Object Type:
Book
System:
The UNT Digital Library
Curvature of the Lanthanide Contraction: An Explanation
A number of studies have shown that for isostructural series of the lanthanides (elements La through Lu), a plot of equivalent metal-ligand bond lengths versus atomic number differs significantly from linearity and can be better fit as a quadratic equation. However, for hydrogen type wave functions, it is the inverse of the average distance of the electron from the nucleus (an estimate of size) that varies linearly with effective nuclear charge. This generates an apparent quadratic dependence of radius with atomic number. Plotting the inverse of lanthanide ion radii (the observed distance minus the ligand size) as a function of effective nuclear charge gives very good linear fits for a variety of lanthanide complexes and materials. Parameters obtained from this fit are in excellent agreement with the calculated Slater shielding constant, k.
Date:
December 21, 2009
Creator:
Raymond, Kenneth; Wellman, Daniel; Sgarlata, Carmelo & Hill, Aru
Object Type:
Article
System:
The UNT Digital Library
Dye Sensitized Tandem Photovoltaic Cells
This work provided a new way to look at photoelectrochemical cells and their performance. Although thought of as low efficiency, a the internal efficiency of a 9% global efficiency dye sensitized solar cell is approximately equal to an 18% efficient silicon cell when each is compared to their useful spectral range. Other work undertaken with this contract also reported the first growth oriented titania and perovskite columns on a transparent conducting oxide. Other work has shown than significant performance enhancement in the performance of dye sensitized solar cells can be obtained through the use of coupling inverse opal photonic crystals to the nanocrystalline dye sensitized solar cell. Lastly, a quick efficient method was developed to bond titanium foils to transparent conducting oxide substrates for anodization.
Date:
December 21, 2009
Creator:
Barber, Greg D.
Object Type:
Report
System:
The UNT Digital Library
Expected Performance of the LHC Synchrotron-Light Telescope (BSRT) and Abort-Gap Monitor (BSRA)
This Report presents calculations of the synchrotron light from proton and lead-ion beams in the LHC at all energies from 0.45 to 7 TeV. It computes the emission from three sources: the uniform-field region of the D3 dipole, the dipole's edge field, and the short undulator just upstream. Light emitted at or near visible wavelengths is assessed for making optical measurements of transverse beam profiles and for monitoring the emptiness of the abort gap in the fill pattern. There is sufficient light for both applications, although both species pass through energy ranges in the ramp with small photon counts. Effects limiting image resolution are examined, including geometric optics, depth of field, and diffraction. The Report also considers recent suggestions that the undulator, intended to supplement the dipole for low energies, should not be ramped off at high energies and perhaps should not be used at all. We conclude that the undulator is essential at low energy for both species, but that it is possible to leave the undulator on at the cost of some blurring at intermediate energies.
Date:
December 21, 2009
Creator:
Fisher, Alan S.
Object Type:
Report
System:
The UNT Digital Library
Improving Corrosion Behavior in SCWR, LFR and VHTR Reactor Materials by Formation of a Stable Oxide
The objective of this study is to understand the influence of the alloy microstructure and composition on the formation of a stable, protective oxide in the environments relevant to the SCWR and LFR reactor concepts, as well as to the VHTR. It is proposed to use state-of-the art techniques to study the fine structure of these oxides to identify the structural differences between stable and unstable oxide layers. The techniques to be used are microbeam synchrotron radiation diffraction and fluorescence, and cross-sectional transmission electron microcopy on samples prepared using focused ion beam.
Date:
December 21, 2009
Creator:
Motta, Arthur T.; Comstock, Robert; Li, Ning; Allen, Todd & Was, Gary
Object Type:
Report
System:
The UNT Digital Library
Metal-Air Electric Vehicle Battery: Sustainable, High-Energy Density, Low-Cost Electrochemical Energy Storage – Metal-Air Ionic Liquid (MAIL) Batteries
Broad Funding Opportunity Announcement Project: ASU is developing a new class of metal-air batteries. Metal-air batteries are promising for future generations of EVs because they use oxygen from the air as one of the battery’s main reactants, reducing the weight of the battery and freeing up more space to devote to energy storage than Li-Ion batteries. ASU technology uses Zinc as the active metal in the battery because it is more abundant and affordable than imported lithium. Metal-air batteries have long been considered impractical for EV applications because the water-based electrolytes inside would decompose the battery interior after just a few uses. Overcoming this traditional limitation, ASU’s new battery system could be both cheaper and safer than today’s Li-Ion batteries, store from 4-5 times more energy, and be recharged over 2,500 times.
Date:
December 21, 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library