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Overcoming Scalability Challenges for Tool Daemon Launching
Many tools that target parallel and distributed environments must co-locate a set of daemons with the distributed processes of the target application. However, efficient and portable deployment of these daemons on large scale systems is an unsolved problem. We overcome this gap with LaunchMON, a scalable, robust, portable, secure, and general purpose infrastructure for launching tool daemons. Its API allows tool builders to identify all processes of a target job, launch daemons on the relevant nodes and control daemon interaction. Our results show that Launch-MON scales to very large daemon counts and substantially enhances performance over existing ad hoc mechanisms.
Date:
February 15, 2008
Creator:
Ahn, D H; Arnold, D C; de Supinski, B R; Lee, G L; Miller, B P & Schulz, M
Object Type:
Article
System:
The UNT Digital Library
Environmental Exemptions for the Navy's Mid-Frequency Active Sonar Training Program
This report discusses laws related to the protection of marine mammals when using mid-frequency active sonar including the Marine Mammal Protection Act (MMPA), the Endangered Species Act (ESA), the National Environmental Policy Act (NEPA), and the Coastal Zone Management Act (CZMA). The report discusses each of the laws generally, and then reviews the litigation surrounding the Navy's compliance with these laws in the context of using the sonar for training purposes off California's coast.
Date:
April 15, 2008
Creator:
Alexander, Kristina
Object Type:
Report
System:
The UNT Digital Library
Timpson & Tenaha News (Timpson, Tex.), Vol. 26, No. 20, Ed. 1 Thursday, May 15, 2008
Weekly newspaper from Timpson, Texas that includes local, state, and national news along with advertising.
Date:
May 15, 2008
Creator:
Alexander, Nancy
Object Type:
Newspaper
System:
The Portal to Texas History
Tests and Calibration of the NIF Neutron Time of Flight Detectors
The National Ignition Facility (NIF) Neutron Time of Flight (NTOF) diagnostic will measure neutron yield and ion temperature in all NIF campaigns in DD, DT, and THD* implosions. The NIF NTOF diagnostic is designed to measure neutron yield from 109 to 2 x 1019. The NTOF consists of several detectors of varying sensitivity located on the NIF at about 5 m and 20 m from the target. Production, testing, and calibration of the NIF NTOF detectors have begun at the Laboratory for Laser Energetics (LLE). Operational tests of the NTOF detectors were performed on several facilities including the OMEGA laser at LLE and the Titan laser at Lawrence Livermore National Laboratory (LLNL). Neutron calibrations were carried out on the OMEGA laser. Results of the NTOF detectors tests and calibration will be presented. *(D = deuterium, T = tritium, H = hydrogen)
Date:
May 15, 2008
Creator:
Ali, Z. A.; Glebov, V. Yu.; Cruz, M.; Duffy, T.; Stoeckl, C.; Roberts, S. et al.
Object Type:
Article
System:
The UNT Digital Library
Characterization of Surplus Plutonium for Disposition Options
The United States (U.S.) has identified 61.5 metric tons (MT) of plutonium that is permanently excess to use in nuclear weapons programs, including 47.2 MT of weapons-grade plutonium. Except for materials that remain in use for programs outside of national defense, including programs for nuclear-energy development, the surplus inventories will be stored safely by the Department of Energy (DOE) and then transferred to facilities that will prepare the plutonium for permanent disposition. Some items will be disposed as transuranic waste, low-level waste, or spent fuel. The remaining surplus plutonium will be managed through: (1) the Mixed Oxide (MOX) Fuel Fabrication Facility (FFF), to be constructed at the Savannah River Site (SRS), where the plutonium will be converted to fuel that will be irradiated in civilian power reactors and later disposed to a high-level waste (HLW) repository as spent fuel; (2) the SRS H-Area facilities, by dissolving and transfer to HLW systems, also for disposal to the repository; or (3) alternative immobilization techniques that would provide durable and secure disposal. From the beginning of the U.S. program for surplus plutonium disposition, DOE has sponsored research to characterize the surplus materials and to judge their suitability for planned disposition options. Because many …
Date:
July 15, 2008
Creator:
Allender, Jeffrey S.; Moore, Edwin N. & Davies, Scott H.
Object Type:
Article
System:
The UNT Digital Library
Electronic contribution to friction on GaAs
The electronic contribution to friction at semiconductor surfaces was investigated by using a Pt-coated tip with 50nm radius in an atomic force microscope sliding against an n-type GaAs(100) substrate. The GaAs surface was covered by an approximately 1 nm thick oxide layer. Charge accumulation or depletion was induced by the application of forward or reverse bias voltages. We observed a substantial increase in friction force in accumulation (forward bias) with respect to depletion (reverse bias). We propose a model based on the force exerted by the trapped charges that quantitatively explains the experimental observations of excess friction.
Date:
April 15, 2008
Creator:
Applied Science and Technology Graduate Group, UC Berkeley; Dept. of Materials Sciences and Engineering, UC Berkeley; Salmeron, Miquel; Qi, Yabing; Park, J.Y.; Hendriksen, B.L.M. et al.
Object Type:
Article
System:
The UNT Digital Library
Temperature dependence of the interface moments in Co2MnSi thin films
X-ray magnetic circular dichroism (XMCD) is utilized to explore the temperature dependence of the interface moments in Co{sub 2}MnSi (CMS) thin films capped with aluminium. By increasing the thickness of the capping layer we demonstrate enhanced interface sensitivity of the measurements and the existence of a thin Mn oxide layer at the CMS/Al interface even when a thick capping layer is used. We show that for well ordered L2{sub 1} CMS films there is no significant variation in either the Co or Mn interface moments as a function of temperature. However, a dramatic reduction in the interface moments at low temperature is observed in a disordered CMS film that is likely to be caused by increased Mn-Mn antiferromagnetic coupling. It is suggested that for ordered L2{sub 1} CMS films the temperature dependence of the tunneling magnetoresistance is not related to changes in the interface moments. However, the existence of residual Mn oxide at the CMS/barrier interface could be a contributing factor.
Date:
March 15, 2008
Creator:
Arenholz, Elke; Telling, N.; Keatley, P.; Shelford, L.; Arenholz, E.; van der Laan, G. et al.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the Decay B- to D*0 e- anti-nu_e
Using 226 million B{bar B} events recorded on the {Upsilon}(4S) resonance with the BABAR detector at the SLAC e{sup +}e{sup -} PEP-II storage rings, they reconstruct B{sup -} {yields} D*{sup 0}e{sup -}{bar {nu}}{sub e} decays using the decay chain D*{sup 0} {yields} D{sup 0}{pi}{sup 0} and D{sup 0} {yields} K{sup -} {pi}{sup +}. From the dependence of their differential rate on the w, the dot product of the four-velocities of B{sup -} and D*{sup 0}, and using the form factor description by Caprini et al. with the parameters F(1) and {rho}{sub 1{sub 1}}{sup 2}, they obtain the results {rho}{sub A{sub 1}}{sup 2} = 1.16 {+-} 0.06 {+-} 0.08, F(1) {center_dot} |V{sub cb}| = (35.9 {+-} 0.6 {+-} 1.4) {center_dot} 10{sup -3}, and {beta}(B{sup -} {yields} D*{sup 0} e{sup -}{bar {nu}}{sub e}) = (5.56 {+-} 0.08 {+-} 0.41)%.
Date:
January 15, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Measurements of Branching Fractions for B+ -> rho+ gamma, B0 -> rho0 gamma, and B0 -> omega gamma
The authors present branching fraction measurements for the radiative decays B{sup +} {yields} {rho}{sup +}{gamma}, B{sup 0} {yields} {rho}{sup 0}{gamma}, and B{sup 0} {yields} {omega}{gamma}. The analysis is based on a data sample of 465 million B{bar B} events collected with the BABAR detector at the PEP-II asymmetric-energy B Factory located at the Stanford Linear Accelerator Center (SLAC). They find {Beta}(B{sup +} {yields} {rho}{sup +}{gamma}) = (1.20{sub -0.37}{sup +0.42} {+-} 0.20) x 10{sup -6}, {Beta}(B{sup 0} {yields} {rho}{sup 0}{gamma}) = (0.97{sub -0.22}{sup +0.24} {+-} 0.06) x 10{sup -6}, and a 90% C.L. upper limit {Beta}(B{sup 0} {yields} {omega}{gamma}) < 0.9 x 10{sup -6}, where the first error is statistical and the second is systematic. They also measure the isospin-violating quantity {Lambda}(B{sup +} {yields} {rho}{sup +}{gamma})/2{Lambda}(B{sup 0} {yields} {rho}{sup 0}{gamma}) - 1 = -0.43{sub -0.22}{sup +0.25} {+-} 0.10.
Date:
August 15, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Search For B --> K* Nu Anti-Nu Decays
We present a search for the decays B {yields} K* {nu}{bar {nu}} using 454 x 10{sup 6} B{bar B} pairs collected at the {Upsilon}(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We first select an event sample where one B is reconstructed in a semileptonic or hadronic mode with one charmed meson. The remaining particles in the event are then examined to search for a B {yields} K* {nu}{bar {nu}} decay. The charged K* is reconstructed as K*{sup +} {yields} K{sub S}{sup 0}{pi}{sup +} or K*{sup +} {yields} K{sup +}{pi}{sup 0}; the neutral K* is identified in K*{sup 0} {yields} K{sup +}{pi}{sup -} mode. We establish upper limits at 90% confidence level of {Beta}(B{sup +} {yields} K*{sup +} {nu}{bar {nu}}) < 8 x 10{sup -5}, {Beta}(B{sup 0} {yields} K*{sup 0} {nu}{bar {nu}}) < 12 x 10{sup -5}, and {Beta}(B {yields} K* {nu}{bar {nu}}) < 8 x 10{sup -5}.
Date:
August 15, 2008
Creator:
Aubert, B.
Object Type:
Article
System:
The UNT Digital Library
Study of the pi+pi-J//psi Mass Spectrum Via Initial State Radiation at BaBar
We present an update of the study of the Y(4260) resonance, produced in the process e{sup +}e{sup -} {yields} {gamma}{sub ISR} {pi}{sup +}{pi}{sup -} J/{psi} using initial-state radiation events at the PEP-II e{sup +}e{sup -} storage rings. This study is based on 454 fb{sup -1} of data recorded with the BABAR detector at a center-of-mass energy in the {Upsilon}(4S) resonance region. From a fit with a single non-relativistic Breit-Wigner shape we obtain updated parameters for the Y(4260) resonance which are m{sub Y} = 4252 {+-} 6{sub -3}{sup +2} MeV/c{sup 2} and {Lambda}{sub Y} = 105 {+-} 18{sub -6}{sup +4} MeV/c{sup 2}; we also measure {Beta}({pi}{sup +}{pi}{sup -} J/{psi}){Lambda}{sub e{sup +}e{sup -}} = (7.5 {+-} 0.9 {+-} 0.8) eV. We cannot confirm the recent BELLE observation of a broad structure around 4.05GeV/c{sup 2} in this decay mode.
Date:
August 15, 2008
Creator:
Aubert, Bernard
Object Type:
Article
System:
The UNT Digital Library
H02 WETLAND TREATMENT SYSTEM WATER CHEMISTRY SAMPLING AND RESULTS REPORT
The H-02 Wetland Treatment System (Figure 1) is used to remove heavy metals (e.g., copper and zinc) from the H-Area process and storm water discharge. Routine flow enters an equalization basin by inlets on either the east (Location 1) or west end (Location 2). The west end influent constitutes 75% of the average flow into the basin which has an average residence time of approximately 3 days at low pool (i.e., 120 gal/min. through a volume of 0.5 million gallons). The water then exits via the basin outlet on the east end. Next, the water flows to a splitter box (Location 3) which evenly separates the flow between two wetland cells for a design flow of 60 gal/min. per wetland cell with a residence time in the cell of approximately 2 days. The wetland effluent is then combined (Location 4) and flows through a spillway before reaching the National Pollution Discharge Elimination System (NPDES) measurement point near Road 4. During initial operation, it was observed that the pH of the water leaving the equalization basin was elevated compared to the influent pH. Furthermore, the elevated pH remained through the wetland cells so that there was an average pH of 10 …
Date:
February 15, 2008
Creator:
Bach, M; Michael Serrato, M & Eric Nelson, E
Object Type:
Report
System:
The UNT Digital Library
Defense Contracting in Iraq: Issues and Options for Congress
This report examines logistical support contracts for troop support services in Iraq primarily administered through the U.S. Army's Logistics Civil Augmentation Program (LOGCAP).
Date:
August 15, 2008
Creator:
Bailey Grasso, Valerie
Object Type:
Report
System:
The UNT Digital Library
The Strategic Petroleum Reserve: History, Perspectives, and Issues
None
Date:
May 15, 2008
Creator:
Bamberger, Robert
Object Type:
Report
System:
The UNT Digital Library
Separation of Nuclear Fuel Surrogates from Silicon Carbide Inert Matrix
The objective of this project has been to identify a process for separating transuranic species from silicon carbide (SiC). Silicon carbide has become one of the prime candidates for the matrix in inert matrix fuels, (IMF) being designed to reduce plutonium inventories and the long half-lives actinides through transmutation since complete reaction is not practical it become necessary to separate the non-transmuted materials from the silicon carbide matrix for ultimate reprocessing. This work reports a method for that required process.l
Date:
December 15, 2008
Creator:
Baney, Ronald
Object Type:
Report
System:
The UNT Digital Library
[Response to Address Inquiry]
Email containing an address update from Kristopher Banks.
Date:
March 15, 2008
Creator:
Banks, Christopher
Object Type:
Text
System:
The UNT Digital Library
State Policies Provide Critical Support for Renewable Electricity
Growth in renewable energy in the U.S. over the past decade has been propelled by a number of forces, including rising fossil fuel prices, environmental concerns, and policy support at the state and federal levels. In this article, we review and discuss what are arguably the two most important types of state policies for supporting electricity generation from geothermal and other forms of renewable energy: renewables portfolio standards and utility integrated resource planning requirements. Within the Western U.S., where the vast majority of the nation's readily-accessible geothermal resource potential resides, these two types of state policies have been critical to the growth of renewable energy, and both promise to continue to play a fundamental role for the foreseeable future. In its essence, a renewables portfolio standard (RPS) requires utilities and other retail electricity suppliers to produce or purchase a minimum quantity or percentage of their generation supply from renewable resources. RPS purchase obligations generally increase over time, and retail suppliers typically must demonstrate compliance on an annual basis. Mandatory RPS policies are backed by various types of compliance enforcement mechanisms, although most states have incorporated some type of cost-containment provision, such as a cost cap or a cap on retail …
Date:
July 15, 2008
Creator:
Barbose, Galen; Wiser, Ryan & Bolinger, Mark
Object Type:
Article
System:
The UNT Digital Library
Federal Stafford Act Disaster Assistance: Presidential Declarations, Eligible Activities, and Funding
This report discusses the Robert T. Stafford Disaster Relief and Emergency Assistance Act (the Stafford Act) that authorizes the President to issue major disaster, emergency, and fire management declarations, which in turn enable federal agencies to provide assistance to state and local governments overwhelmed by catastrophes.
Date:
August 15, 2008
Creator:
Bea, Keith
Object Type:
Report
System:
The UNT Digital Library
Farm and Food Support Under USDA’s Section 32 Program
This report provides information about the Farm and Food Support Under USDA’s Section 32 Program which is funded by a permanent appropriation of 30% of previous year' s custom receipts to support the farm sector.
Date:
February 15, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
Sanitary and Phytosanitary (SPS) Concerns in Agricultural Trade
This report categorizes, describes, and in some cases quantifies these barriers on a country-by-country basis. Sixty-two major trading partners are covered in the 2008 report.10 Sanitary and phytosanitary (SPS) measures and technical barriers to trade (TBTs) are generally detailed in each country’s profile and, where feasible, their impacts on U.S. exports are quantified by U.S. Trade Representative (USTR).
Date:
December 15, 2008
Creator:
Becker, Geoffrey S.
Object Type:
Report
System:
The UNT Digital Library
The Cost of Iraq, Afghanistan, and Other Global War on Terror Operations Since 9/11
This report analyzes war funding for the Defense Department and tracks funding for USAID and VA Medical funding.
Date:
October 15, 2008
Creator:
Belasco, Amy
Object Type:
Report
System:
The UNT Digital Library
Optimal Knot Selection for Least-squares Fitting of Noisy Data with Spline Functions
An automatic data-smoothing algorithm for data from digital oscilloscopes is described. The algorithm adjusts the bandwidth of the filtering as a function of time to provide minimum mean squared error at each time. It produces an estimate of the root-mean-square error as a function of time and does so without any statistical assumptions about the unknown signal. The algorithm is based on least-squares fitting to the data of cubic spline functions.
Date:
May 15, 2008
Creator:
Blair, Jerome
Object Type:
Article
System:
The UNT Digital Library
Gamma Ray Multiplicity of 252Cf Spontaneous Fission using LiBerACE
We are studying the gamma ray and neutron multiplicity of various fission processes, beginning with the spontaneous fission of {sup 252}Cf, for a variety of basic and applied science purposes. The Livermore-Berkeley Array for Collaborative Experiments (LiBerACE) consists of six high-purity germanium Clover detectors (HPGe) each enclosed by an array of 16 bismuth-germanate (BGO) detectors. These detectors were arranged in a cubic pattern around a 1 {micro}Ci {sup 252}Cf source to attempt to cover as much solid angle of gamma ray emission as possible with a high level of segmentation. The single-gamma detector response function is determined at several energies by tagging in a HPGe detector on the photopeak of one of two gamma rays in two-gamma ray calibration sources and observing the multiplicity of the remainder of the array. Summing these single-gamma responses in groups yields the response function of the array to higher multiplicity events, which are convolved with multiplicity distributions from theoretical models and compared to the measured results to test the models validity.
Date:
January 15, 2008
Creator:
Bleuel, D L; Bernstein, L A; Burke, J T; Heffner, M D; Norman, E B; Scielzo, N D et al.
Object Type:
Article
System:
The UNT Digital Library
Surpassing Expectations: State of the U.S. Wind Power Market
The wind power industry in the U.S. has been on a growth binge in recent years, and the rapid pace of development has made it difficult to keep up with trends in the marketplace. Yet the need for timely, objective information on the wind industry and its progress has never been greater. This article, excerpted from a longer report from the U.S. Department of Energy, attempts to fill this need by providing a comprehensive, yet detailed, overview of key developments in the U.S. wind power market, with a particular focus on 2007. This summary includes information on wind project installation trends, industry developments, and, perhaps most interestingly, project-level installed cost and pricing information that has not otherwise been widely reported. The article concentrates on larger-scale wind applications, defined here as projects utilizing turbines that exceed 50 kW in size. In many cases, the data reported here represent only a sample of all wind projects installed in the United States; furthermore, the data vary in quality. As such, emphasis should be placed on overall trends in the data, rather than on individual data points.
Date:
July 15, 2008
Creator:
Bolinger, Mark A. & Wiser, Ryan
Object Type:
Article
System:
The UNT Digital Library