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Cross-correlations of the Lyman-alpha forest with weak lensing convergence I: Analytical Estimates of S/N and Implications for Neutrino Mass and Dark Energy
We expect a detectable correlation between two seemingly unrelated quantities: the four point function of the cosmic microwave background (CMB) and the amplitude of flux decrements in quasar (QSO) spectra. The amplitude of CMB convergence in a given direction measures the projected surface density of matter. Measurements of QSO flux decrements trace the small-scale distribution of gas along a given line-of-sight. While the cross-correlation between these two measurements is small for a single line-of-sight, upcoming large surveys should enable its detection. This paper presents analytical estimates for the signal to noise (S/N) for measurements of the cross-correlation between the flux decrement and the convergence, {delta}F{kappa}, and for measurements of the cross-correlation between the variance in flux decrement and the convergence, <({delta}F){sup 2}{kappa}>. For the ongoing BOSS (SDSS III) and Planck surveys, we estimate an S/N of 30 and 9.6 for these two correlations. For the proposed BigBOSS and ACTPOL surveys, we estimate an S/N of 130 and 50 respectively. Since <({delta}F){sup 2}{kappa}> {proportional_to} {delta}{sub s}{sup 4}, the amplitude of these cross-correlations can potentially be used to measure the amplitude of {delta}{sub 8} at z {approx} 2 to 2.5% with BOSS and Planck and even better with future data sets. These …
Date:
October 1, 2009
Creator:
Vallinotto, Alberto; Viel, Matteo; Das, Sudeep & Spergel, David N.
Object Type:
Article
System:
The UNT Digital Library
Crossing the mesoscale no-man<U+2019>s land via parallel kinetic Monte Carlo.
The kinetic Monte Carlo method and its variants are powerful tools for modeling materials at the mesoscale, meaning at length and time scales in between the atomic and continuum. We have completed a 3 year LDRD project with the goal of developing a parallel kinetic Monte Carlo capability and applying it to materials modeling problems of interest to Sandia. In this report we give an overview of the methods and algorithms developed, and describe our new open-source code called SPPARKS, for Stochastic Parallel PARticle Kinetic Simulator. We also highlight the development of several Monte Carlo models in SPPARKS for specific materials modeling applications, including grain growth, bubble formation, diffusion in nanoporous materials, defect formation in erbium hydrides, and surface growth and evolution.
Date:
October 1, 2009
Creator:
Garcia Cardona, Cristina (San Diego State University); Webb, Edmund Blackburn, III; Wagner, Gregory John; Tikare, Veena; Holm, Elizabeth Ann; Plimpton, Steven James et al.
Object Type:
Report
System:
The UNT Digital Library
A Depleted Argon Dark Matter Search
None
Date:
October 1, 2009
Creator:
Alton, Drew; Coll., /Augustana; Durben, Dan; Keeter, Kara; Zehfus, Michael; U., /Black Hills State et al.
Object Type:
Report
System:
The UNT Digital Library
DETERMINATION OF CORROSION INHIBITOR CRITERIA FOR TYPE III/IIIA TANKS DURING SALT DISSOLUTION OPERATIONS SUMMARY DOCUMENT
Dissolution of salt from Type III/IIIA waste tanks at the Savannah River Site may create solutions with inhibitor concentrations below those currently required (0.6M OH{sup -} and 1.1M OH{sup -} + NO{sub 2}{sup -}) per the Corrosion Control Program for high nitrate salt solutions (5.5 to 8.5M NO{sub 3}{sup -}). An experimental program was conducted to evaluate the corrosion susceptibility of grade A537 carbon steel for waste simulants containing 4.5-8.5M NaNO{sub 3} with maximum inhibitor concentrations of 0.6M NaOH and 0.2M NaNO{sub 2}. These maximum inhibitor concentrations used in this program are at a reduced level from those currently required. Current requirements were initially established for the Types I, II and IV tanks made of A285 carbon steel. The experimental program involved corrosion testing to evaluate the pitting and stress corrosion stress corrosion cracking (SCC) susceptibility of the Type III/IIIA waste tank materials. The program was conducted in two phases; the results of the first phase were reported previously (WSRC-STI-2006-00029). In this second phase, the corrosion specimens were modified to represent the 'as-fabricated' condition of the tank wall, and included specimens with mill scale, ground welds and stress-relief heat treatments. The complete description of the corrosion testing and the results …
Date:
October 1, 2009
Creator:
Mickalonis, J.; Wiersma, B. & Garcia-Diaz, B.
Object Type:
Report
System:
The UNT Digital Library
Di-J/psi Studies, Level 3 Tracking and the D0 Run IIb Upgrade
The D0 detector underwent an upgrade to its silicon vertex detector and triggering systems during the transition from Run IIa to Run IIb to maximize its ability to fully exploit Run II at the Fermilab Tevatron. This thesis describes improvements made to the tracking and vertexing algorithms used by the high level trigger in both Run IIa and Run IIb, as well as a search for resonant di-J/{psi} states using both Run IIa and Run IIb data. Improvements made to the tracking and vertexing algorithms during Run IIa included the optimization of the existing tracking software to reduce overall processing time and the certification and testing of a new software release. Upgrades made to the high level trigger for Run IIb included the development of a new tracking algorithm and the inclusion of the new Layer 0 silicon detector into the existing software. The integration of Layer 0 into the high level trigger has led to an improvement in the overall impact parameter resolution for tracks of {approx}50%. The development of a new parameterization method for finding the error associated to the impact parameter of tracks returned by the high level tracking algorithm, in association with the inclusion of Layer …
Date:
October 1, 2009
Creator:
Vint, Philip John
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Diboson Production at D0
We present recent diboson production measurements from the D0 experiment at Fermilab's Tevatron collider. The production of ZZ was observed using leptonic final states. Z{gamma} {yields} vv{gamma} was observed and used to set the most stringent limits from a hadron collider on anomalous Z{gamma}{gamma} and ZZ{gamma} trilinear gauge couplings (TGCs). WW events with leptonic final states and WW + WZ events with semi-leptonic final states were used to set limits on anomalous WWZ and WW{gamma} TGCs. Finally, limits on anomalous WWZ and WW{gamma} TGCs were obtained from a combination of the fully-leptonic W{gamma}, WW, and WZ channels and the semi-leptonic WW and WZ channels, giving the most stringent limits from a hadron collider.
Date:
October 1, 2009
Creator:
Haley, Joseph
Object Type:
Article
System:
The UNT Digital Library
Discovery, integration, and interrogation of biotic/abiotic materials and systems.
Immobilization of individual cells and collections of cells in well-defined, reproducible, nano-to-microscale structures that allow structural and functional manipulation and interrogation is important for developing new classes of biotic/abiotic materials, for establishing the relationship between genotype and phenotype, and for elucidating responses to disease, injury/stress, or therapy - primary goals of biomedical research. Although there has been considerable recent progress in investigating the response of cells to chemical or topological patterns defined lithographically on 2D surfaces, it is time to advance from two-dimensional adhesion on dishes/fluidic devices to three-dimensional architectures that better represent the nanoporous, 3-D extracellular matrix (ECM). 3D immobilization in nanostructured hosts enables cells to be surrounded by other cells, maintains fluidic connectivity/accessibility, and allows development of 3-D molecular or chemical gradients that provide an instructive background to guide cellular behavior. Although 3-D cell immobilization in polymers, hydrogels, and inorganic gels has been practiced for decades, these approaches do not provide for bio/nano interfaces with 3D spatial control of topology and composition important to both the maintenance of natural cellular behavior patterns and the development of new non-native behaviors and functions. This LDRD project exploited our discovery of the ability of living cells to organize extended nanostructures and …
Date:
October 1, 2009
Creator:
Dunphy, Darren Robert (University of New Mexico, Albuquerque, NM); Brinker, C. Jeffrey; Ashley, Carlee E. (University of New Mexico, Albuquerque, NM); Baca, Helen Kennicott (University of New Mexico, Albuquerque, NM); Lopez, DeAnna M. (University of New Mexico, Albuquerque, NM) & Carnes, Eric C. (University of New Mexico, Albuquerque, NM)
Object Type:
Report
System:
The UNT Digital Library
Distributed Energy Systems Integration Group (Fact Sheet)
Factsheet developed to describe the activites of the Distributed Energy Systems Integration Group within NREL's Electricity, Resources, and Buildings Systems Integration center.
Date:
October 1, 2009
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
DOE 2008 Occupational Radiation Exposure October 2009
A major priority of the U.S. Department of Energy (DOE) is to ensure the health, safety, and security of DOE employees, contractors, and subcontractors. The Office of Health, Safety and Security (HSS) provides the corporate-level leadership and strategic vision necessary to better coordinate and integrate health, safety, environment, security, enforcement, and independent oversight programs. One function that supports this mission is the DOE Corporate Operating Experience Program that provides collection, analysis, and dissemination of performance indicators, such as occupational radiation exposure information. This analysis supports corporate decision-making and synthesizes operational information to support continuous environment, safety, and health improvement across the DOE complex.
Date:
October 1, 2009
Creator:
U.S. Department of Energy, Office of Health, Safety, and Security
Object Type:
Report
System:
The UNT Digital Library
The Dublin Citizen (Dublin, Tex.), Vol. 20, No. 5, Ed. 1 Thursday, October 1, 2009
Weekly newspaper from Dublin, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Dynamic crack initiation toughness : experiments and peridynamic modeling.
This is a dissertation on research conducted studying the dynamic crack initiation toughness of a 4340 steel. Researchers have been conducting experimental testing of dynamic crack initiation toughness, K{sub Ic}, for many years, using many experimental techniques with vastly different trends in the results when reporting K{sub Ic} as a function of loading rate. The dissertation describes a novel experimental technique for measuring K{sub Ic} in metals using the Kolsky bar. The method borrows from improvements made in recent years in traditional Kolsky bar testing by using pulse shaping techniques to ensure a constant loading rate applied to the sample before crack initiation. Dynamic crack initiation measurements were reported on a 4340 steel at two different loading rates. The steel was shown to exhibit a rate dependence, with the recorded values of K{sub Ic} being much higher at the higher loading rate. Using the knowledge of this rate dependence as a motivation in attempting to model the fracture events, a viscoplastic constitutive model was implemented into a peridynamic computational mechanics code. Peridynamics is a newly developed theory in solid mechanics that replaces the classical partial differential equations of motion with integral-differential equations which do not require the existence of spatial …
Date:
October 1, 2009
Creator:
Foster, John T.
Object Type:
Report
System:
The UNT Digital Library
The Effect of Driving Intensity and Incomplete Charging on the Fuel Economy of a Hymotion Prius PHEV
On-road testing was conducted on a Hymotion Prius plug-in hybrid electric vehicle (PHEV) at the Electric Transportation Engineering Corporation in Phoenix, Arizona. The tests were comprised of on-road urban and highway driving during charge-depleting and charge-sustaining operation. Determining real-world effectiveness of PHEVs at reducing petroleum consumption in real world driving was the main focus of the study. Throughout testing, several factors that affect fuel consumption of PHEVs were identified. This report discusses two of these factors: driving intensity (i.e., driving aggressiveness) and battery charging completeness. These two factors are unrelated, yet both significantly impact the vehicle’s fuel economy. Driving intensity was shown to decrease fuel economy by up to half. Charging completeness, which was affected by human factors and ambient temperature conditions, also showed to have great impact on fuel economy for the Hymotion Prius. These tests were performed for the U.S. Department of Energy’s Advanced Vehicle Testing Activity. The Advanced Vehicle Testing Activity, part of the U.S. Department of Energy’s Vehicle Technology Program, is conducted by the Idaho National Laboratory and the Electric Transportation Engineering Corporation.
Date:
October 1, 2009
Creator:
Carlson, Richard Barney
Object Type:
Report
System:
The UNT Digital Library
Effects of composition on the mechanical response of alumina-filled epoxy.
The effect of composition on the elastic responses of alumina particle-filled epoxy composites is examined using isotropic elastic response models relating the average stresses and strains in a discretely reinforced composite material consisting of perfectly bonded and uniformly distributed particles in a solid isotropic elastic matrix. Responses for small elastic deformations and large hydrostatic and plane-strain compressions are considered. The response model for small elastic deformations depends on known elastic properties of the matrix and particles, the volume fraction of the particles, and two additional material properties that reflect the composition and microstructure of the composite material. These two material properties, called strain concentration coefficients, are characterized for eleven alumina-filled epoxy composites. It is found that while the strain concentration coefficients depend strongly on the volume fraction of alumina particles, no significant dependence on particle morphology and size is observed for the compositions examined. Additionally, an analysis of the strain concentration coefficients reveals a remarkably simple dependency on the alumina volume fraction. Responses for large hydrostatic and plane-strain compressions are obtained by generalizing the equations developed for small deformation, and letting the alumina volume fraction in the composite increase with compression. The large compression plane-strain response model is shown to …
Date:
October 1, 2009
Creator:
Montgomery, Stephen Tedford
Object Type:
Report
System:
The UNT Digital Library
Electra Star-News (Electra, Tex.), Vol. 103, No. 8, Ed. 1 Thursday, October 1, 2009
Weekly newspaper from Electra, Texas that includes local, state, and national news along with advertising.
Date:
October 1, 2009
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Electrochemical Oxygen Pumps. Final CRADA Report.
All tasks of the Work Plan of ISTC Project 2277p have been completed, thus: (1) techniques of chemical synthesis were developed for more than ten recipes of electrolyte based on cerium oxide doped with 20 mole% of gadolinium (CeGd)O{sub 2}, doped by more than 10 oxide systems including 6 recipes in addition to the Work Plan; (2) electric conductivity and mechanical strength of CeGd specimens with additions of oxide systems were performed, two candidate materials for the electrolyte of electrochemical oxygen pump (pure CeGd and CeGd doped by 0.2 wt% of a transition metal) were chosen; (3) extended studies of mechanical strength of candidate material specimens were performed at room temperature and at 400, 600, 800 C; (4) fixtures for determination of mechanical strength of tubes by external pressure above 40 atmospheres at temperature up to 700 C were developed and fabricated; and (5) technology of slip casting of tubes from pure (Ce,Gd)O{sub 2} and of (Ce,Gd)O{sub 2} doped by 0.2 wt% of a transition metal, withstanding external pressure of minimum 40 atmospheres at temperature up to 700 C was developed, a batch of tubes was sent for testing to Argonne National Laboratory; (6) technology of making nanopowder from pure …
Date:
October 1, 2009
Creator:
Carter, J. D. & Noble, J.
Object Type:
Report
System:
The UNT Digital Library
Emergency Management: Preliminary Observations on FEMA's Community Preparedness Programs Related to the National Preparedness System
Testimony issued by the Government Accountability Office with an abstract that begins "By preparing their families and property before an event, individuals can reduce a disaster's impact on them and their need for first responder assistance, particularly in the first 72 hours following a disaster. By law, the Federal Emergency Management Agency (FEMA), located in the Department of Homeland Security (DHS), is to develop a national preparedness system (NPS)--FEMA includes community preparedness programs as part of the NPS. FEMA's budget to operate these programs made up less than one half of 1 percent of its $7.9 billion budget for fiscal year 2009. These programs include the Citizen Corps program and its partner programs, such as Fire Corps, and rely on volunteers to coordinate efforts and assist first responders in local communities. DHS's Ready Campaign promotes preparedness through mass media. This testimony provides preliminary observations on (1) challenges FEMA faces in measuring the performance of Citizen Corps, its partner programs, and the Ready Campaign and (2) actions FEMA has taken to develop a strategy to encompass how Citizen Corps, its partner programs, and the Ready Campaign operate within the context of the NPS. This testimony is based on work conducted from …
Date:
October 1, 2009
Creator:
United States. Government Accountability Office.
Object Type:
Text
System:
The UNT Digital Library
Emissions inventory report summary for Los Alamos National Laboratory for calendar year 2008
Los Alamos National Laboratory (LANL) is subject to annual emissions reporting requirements for regulated air pollutants under Title 20 of the New Mexico Administrative Code, Chapter 2, Part 73 (20.2.73 NMAC), Notice of Intent and Emissions Inventory Requirements. The applicability of the requirements is based on the Laboratory’s potential to emit 100 tons per year of suspended particulate matter, nitrogen oxides, carbon monoxide, sulfur oxides, or volatile organic compounds. Additionally, on April 30, 2004, LANL was issued a Title V Operating Permit from the New Mexico Environment Department/Air Quality Bureau, under 20.2.70 NMAC. This permit was modified and reissued on July 16, 2007. This Title V Operating Permit (Permit No. P-100M2) includes emission limits and operating limits for all regulated sources of air pollution at LANL. The Title V Operating Permit also requires semiannual emissions reporting for all sources included in the permit. This report summarizes both the annual emissions inventory reporting and the semiannual emissions reporting for LANL for calendar year 2008. LANL’s 2008 emissions are well below the emission limits in the Title V Operating Permit.
Date:
October 1, 2009
Creator:
Group, Ecology and Air Quality
Object Type:
Report
System:
The UNT Digital Library
Energy scavenging from environmental vibration.
The goal of this project is to develop an efficient energy scavenger for converting ambient low-frequency vibrations into electrical power. In order to achieve this a novel inertial micro power generator architecture has been developed that utilizes the bi-stable motion of a mechanical mass to convert a broad range of low-frequency (< 30Hz), and large-deflection (>250 {micro}m) ambient vibrations into high-frequency electrical output energy. The generator incorporates a bi-stable mechanical structure to initiate high-frequency mechanical oscillations in an electromagnetic scavenger. This frequency up-conversion technique enhances the electromechanical coupling and increases the generated power. This architecture is called the Parametric Frequency Increased Generator (PFIG). Three generations of the device have been fabricated. It was first demonstrated using a larger bench-top prototype that had a functional volume of 3.7cm3. It generated a peak power of 558{micro}W and an average power of 39.5{micro}W at an input acceleration of 1g applied at 10 Hz. The performance of this device has still not been matched by any other reported work. It yielded the best power density and efficiency for any scavenger operating from low-frequency (<10Hz) vibrations. A second-generation device was then fabricated. It generated a peak power of 288{micro}W and an average power of 5.8{micro}W …
Date:
October 1, 2009
Creator:
Galchev, Tzeno (University of Michigan); Apblett, Christopher Alan & Najafi, Khalil (University of Michigan)
Object Type:
Report
System:
The UNT Digital Library
Enhanced molecular dynamics for simulating porous interphase layers in batteries.
Understanding charge transport processes at a molecular level using computational techniques is currently hindered by a lack of appropriate models for incorporating anistropic electric fields in molecular dynamics (MD) simulations. An important technological example is ion transport through solid-electrolyte interphase (SEI) layers that form in many common types of batteries. These layers regulate the rate at which electro-chemical reactions occur, affecting power, safety, and reliability. In this work, we develop a model for incorporating electric fields in MD using an atomistic-to-continuum framework. This framework provides the mathematical and algorithmic infrastructure to couple finite element (FE) representations of continuous data with atomic data. In this application, the electric potential is represented on a FE mesh and is calculated from a Poisson equation with source terms determined by the distribution of the atomic charges. Boundary conditions can be imposed naturally using the FE description of the potential, which then propagates to each atom through modified forces. The method is verified using simulations where analytical or theoretical solutions are known. Calculations of salt water solutions in complex domains are performed to understand how ions are attracted to charged surfaces in the presence of electric fields and interfering media.
Date:
October 1, 2009
Creator:
Zimmerman, Jonathan A.; Wong, Bryan Matthew; Jones, Reese E.; Templeton, Jeremy Alan & Lee, Jonathan (Rice University, Houston, TX)
Object Type:
Report
System:
The UNT Digital Library
EPAct Fleet and Stakeholder Workshops
None
Date:
October 1, 2009
Creator:
Sears, T.
Object Type:
Presentation
System:
The UNT Digital Library
Equation of state and transport property measurements of warm dense matter.
Location of the liquid-vapor critical point (c.p.) is one of the key features of equation of state models used in simulating high energy density physics and pulsed power experiments. For example, material behavior in the location of the vapor dome is critical in determining how and when coronal plasmas form in expanding wires. Transport properties, such as conductivity and opacity, can vary an order of magnitude depending on whether the state of the material is inside or outside of the vapor dome. Due to the difficulty in experimentally producing states near the vapor dome, for all but a few materials, such as Cesium and Mercury, the uncertainty in the location of the c.p. is of order 100%. These states of interest can be produced on Z through high-velocity shock and release experiments. For example, it is estimated that release adiabats from {approx}1000 GPa in aluminum would skirt the vapor dome allowing estimates of the c.p. to be made. This is within the reach of Z experiments (flyer plate velocity of {approx}30 km/s). Recent high-fidelity EOS models and hydrocode simulations suggest that the dynamic two-phase flow behavior observed in initial scoping experiments can be reproduced, providing a link between theory and …
Date:
October 1, 2009
Creator:
Knudson, Marcus D. & Desjarlais, Michael Paul
Object Type:
Report
System:
The UNT Digital Library
Evaluation of the impact chip multiprocessors have on SNL application performance.
This report describes trans-organizational efforts to investigate the impact of chip multiprocessors (CMPs) on the performance of important Sandia application codes. The impact of CMPs on the performance and applicability of Sandia's system software was also investigated. The goal of the investigation was to make algorithmic and architectural recommendations for next generation platform acquisitions.
Date:
October 1, 2009
Creator:
Doerfler, Douglas W.
Object Type:
Report
System:
The UNT Digital Library
Evaluation Report on "The Department's Unclassified Cyber Security Program"
Industry experts report that security challenges and threats are continually evolving as malicious activity has become more web-based and attackers are able to rapidly adapt their attack methods. In addition, the number of data breaches continues to rise. In an effort to mitigate and address threats and protect valuable information, the Department of Energy anticipated spending about $275 million in Fiscal Year (FY) 2009 to implement cyber security measures necessary to protect its information technology resources. These systems and data are designed to support the Department's mission and business lines of energy security, nuclear security, scientific discovery and innovation, and environmental responsibility. The Federal Information Security Management Act of 2002 (FISMA) provides direction to agencies on the management and oversight of information security risks, including design and implementation of controls to protect Federal information and systems. As required by FISMA, the Office of Inspector General conducts an annual independent evaluation to determine whether the Department's unclassified cyber security program adequately protects its information systems and data. This memorandum and the attached report present the results of our evaluation for FY 2009. The Department continued to make incremental improvements in its unclassified cyber security program. Our evaluation disclosed that most sites …
Date:
October 1, 2009
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Exotic Photon Searches at CDF II
We present recent results of searches for exotic photons at CDF II. In the first signature-based search, we search for anomalous production of two photons with additional energetic objects. The results are consistent with the standard model expectations. In the second analysis, we present a signature-based search for anomalous production of events containing a photon, two jets, of which at least one is identified as originating from a b quark, and missing transverse energy. We find no indications of non-standard model phenomena. Finally, a search for a fermiophobic Higgs in the diphoton final state is presented. Since no evidence of a resonance in the diphoton mass spectrum is observed we exclude this Higgs boson with mass below 106 GeV/c{sup 2} at a 95% confidence level.
Date:
October 1, 2009
Creator:
Lee, Eunsin & collaboration, for the CDF
Object Type:
Article
System:
The UNT Digital Library