Serial/Series Title
OIT Best Practices
45
OIT Tip Sheets
32
Fiscal Year 2000
23
Small Wind Electric Systems Consumers' Guides
20
Fiscal Year 2007
17
Clean Cities alternative fuel information series
15
Fiscal Year 2001
15
Fiscal Year 2002
14
Fiscal Year 1999
13
Gas/Liquid Membranes for Natural Gas Upgrading Quarterly Report
12
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Reconnaissance of Field Sites for the Study of Chemical Weathering on the Guayana Shield, South America
Despite the fact that chemical weathering of silicate rocks plays an important role in the draw-down of CO{sub 2} over geologic time scales (Berner and Berner, 1996), the overall controls on the rate of chemical weathering are still not completely understood. Lacking a mechanistic understanding of these controls, it remains difficult to evaluate a hypothesis such as that presented by Raymo and Ruddiman (1992), who suggested that enhanced weathering and CO{sub 2} draw-down resulting from the uplift of the Himalayas contributed to global cooling during the Cenozoic. At an even more fundamental level, the three to four order of magnitude discrepancy between laboratory and field weathering rates is still unresolved (White et al., 1996). There is as yet no comprehensive, mechanistic model for silicate chemical weathering that considers the coupled effects of precipitation, vadose zone flow, and chemical reactions. The absence of robust process models for silicate weathering and the failure to resolve some of these important questions may in fact be related-the controls on the overall rates of weathering cannot be understood without considering the weathering environment as one in which multiple, time-dependent chemical and physical processes are coupled (Malmstrom, 2000). Once chemical weathering is understood at a mechanistic …
Date:
February 1, 2003
Creator:
Steefell, C. I.; Viani, B. E.; Ramirez, A. & Lee, K.
Object Type:
Report
System:
The UNT Digital Library
Preventive Maintenance Strategies for Compressed Air Systems;Industrial Technologies Program (ITP) Compressed Air Tip Sheet No.6
BestPractices Program tip sheet discussing preventive maintenance strategies for compressed air systems.
Date:
August 1, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Reducing the longitudinal emittance of the 8-GeV beam via the rf manipulation in a booster cycle
Bunch rotation will cause the longitudinal emittance growth whenever there are far more A rf stations than B rf stations, or vice versa. An alternate method via optimizing the RFSUM curve in a Booster cycle has been investigated using the ESME simulation. Since the rf manipulation at transition crossing can reduce the longitudinal emittance 31% and the momentum spread 17%, eventually, the rms momentum spread of 2.98 MeV and the longitudinal emittance of 0.061 eV {center_dot} sec with 95% of the beam can be achieved at 8-GeV.
Date:
August 1, 2005
Creator:
Yang, Xi; Lebedev, Valeri A. & Ankenbrandt, Charles M.
Object Type:
Report
System:
The UNT Digital Library
Insights into the Dynamic Response of Tunnels in Jointed Rocks
Tunnels in jointed rocks can be subjected to severe dynamic loads because of rock bursts, coal bumps, and large earthquakes. A series of 3-dimensional simulations was performed, based on discrete element analysis to gain insights into the parameters that influence the response of such tunnels. The simulations looked at the effect of joint set orientation, the effect of joint spacing, the effect of pulse shape for a given displacement, and the influence of using rigid versus deformable blocks in the analyses. The results of this modeling were also compared to field evidence of dynamic tunnel failures. This comparison reinforced the notion that 3-dimensional discrete element analysis can capture very well the kinematics of structures in jointed rock under dynamic loading.
Date:
November 1, 2004
Creator:
Heuze, F E
Object Type:
Article
System:
The UNT Digital Library
Small Wind Electric Systems: An Idaho Consumer's Guide (Revised)
Small Wind Electric Systems: An Idaho Consumer's Guide provides consumers with information to help them determine whether a small wind electric system can provide all or a portion of the energy they need for their home or business based on their wind resource, energy needs, and their economics. Topics discussed in the guide include how to make a home more energy efficient, how to choose the correct turbine size, the parts of a wind electric system, how to determine whether enough wind resource exists, how to choose the best site for a turbine, how to connect a system to the utility grid, and whether it's possible to become independent of the utility grid using wind energy. In addition, the cover of the guide contains a regional wind resource map and a list of incentives and contacts for more information.
Date:
August 1, 2004
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Performance Evaluations of Prototype Houses: Minimum 40% Residential Building Energy Savings Level Habitat for Humanity of Greater Newburgh Liberty Street Project: April 2003--September 2004
Habitat for Humanity International (HfHI) is a nonprofit organization that engages volunteers and would-be homebuyers in programs that emphasize sweat-equity and self-help. Habitat is among the top-ten housing producers in the United States. In collaboration with the HfHI Department of Construction & Environmental Resources, Steven Winter Associates, Inc., (SWA) began working with the Habitat for Humanity of Greater Newburgh (HfHGN) affiliate in Newburgh, New York, in April 2003. Since October 1999, HfHGN has acquired and renovated abandoned houses for an average cost of $45,000 per home. The affiliate serves area families living in overcrowded, substandard housing and spending 50% to 80% of their income on housing. In August 2003, HfHGN began their first new construction project, six row houses located on Liberty Street in Newburgh.
Date:
June 1, 2005
Creator:
Guilbert, R. & Magee, A.
Object Type:
Report
System:
The UNT Digital Library
Toward understanding environmental effects in SDSS clusters
We find clusters and superclusters of galaxies using the Data Release 1 of the Sloan Digital Sky Survey. We determine the luminosity function of clusters and find that clusters in a high-density environment have a luminosity a factor of {approx}5 higher than in a low-density environment. We also study clusters and superclusters in numerical simulations. Simulated clusters in a high-density environment are also more massive than those in a low-density environment. Comparison of the density distribution at various epochs in simulations shows that in large low-density regions (voids) dynamical evolution is very slow and stops at an early epoch. In contrast, in large regions of higher density (superclusters) dynamical evolution starts early and continues until the present; here particles cluster early, and by merging of smaller groups very rich systems of galaxies form.
Date:
November 1, 2004
Creator:
Einasto, Jaan; Tago, E.; Einasto, M.; Saar, E.; Suhhonenko, I.; Heinamaki, P. et al.
Object Type:
Article
System:
The UNT Digital Library
EVALUATING ENVIRONMENTAL DECISION SUPPORT TOOLS.
Effective contaminated land management requires a number of decisions addressing a suite of technical, economic, and social concerns. These concerns include human health risks, ecological risks, economic costs, technical feasibility of proposed remedial actions, and the value society places on clean-up and re-use of formerly contaminated lands. Decision making, in the face of uncertainty and multiple and often conflicting objectives, is a vital and challenging role in environmental management that affects a significant economic activity. Although each environmental remediation problem is unique and requires a site-specific analysis, many of the key decisions are similar in structure. This has led many to attempt to develop standard approaches. As part of the standardization process, attempts have been made to codify specialist expertise into decision support tools. This activity is intended to facilitate reproducible and transparent decision making. The process of codifying procedures has also been found to be a useful activity for establishing and rationalizing management processes. This study will have two primary objectives. The first is to develop taxonomy for Decision Support Tools (DST) to provide a framework for understanding the different tools and what they are designed to address in the context of environmental remediation problems. The taxonomy will have …
Date:
October 1, 2004
Creator:
SULLIVAN, T.
Object Type:
Report
System:
The UNT Digital Library
The Weak lensing bispectrum
Weak gravitational lensing of background galaxies offers an excellent opportunity to study the intervening distribution of matter. While much attention to date has focused on the two-point function of the cosmic shear, the three-point function, the bispectrum, also contains very useful cosmological information. Here, we compute three corrections to the bispectrum which are nominally of the same order as the leading term. We show that the corrections are small, so they can be ignored when analyzing present surveys. However, they will eventually have to be included for accurate parameter estimates from future surveys.
Date:
January 1, 2005
Creator:
Dodelson, Scott & Zhang, Pengjie
Object Type:
Article
System:
The UNT Digital Library
Analysis and Comparison of Test Results from the Small Wind Research Turbine Test Project: Preprint
Most small wind turbines furl (yaw or tilt out of the wind) as a means of limiting power and rotor speeds in high winds. The Small Wind Research Turbine (SWRT) testing project was initiated in 2003 with the goal of better characterizing both small wind turbine loads (including thrust) and dynamic behavior, specifically as they relate to furling. The main purpose of the testing was to produce high-quality data sets for model development and validation and to help the wind industry further their understanding of small wind turbine behavior. Testing was conducted on a modified Bergey Excel 10-kW wind turbine. A special shaft sensor was designed to measure shaft loads including thrust, torque, and shaft bending. Analysis of 10-minute mean data showed a strong correlation between furling and center of thrust location, as calculated from the shaft-bending and thrust measurements. Data were collected for three different turbine configurations that included a change in the lateral furling offset and the blades. An analysis of inflow conditions indicated that organized atmospheric turbulence had some impact on furling.
Date:
November 1, 2004
Creator:
Corbus, D. & Prascher, D.
Object Type:
Article
System:
The UNT Digital Library
Measurement of the azimuthal angle distribution of leptons from W boson decays as a function of the W transverse momentum in p anti-p collisions at s**(1/2) = 1.8-TeV
We present the first measurement of the A{sub 2} and A{sub 3} angular coefficients of the W boson produced in proton-antiproton collisions. We study W {yields} ev{sub e} and W {yields} {mu}{nu}{sub {mu}} candidate events produced in association with at least one jet at CDF, during Run Ia and Run Ib of the Tevatron at {radical}s = 1.8 TeV. The corresponding integrated luminosity was 110 pb{sup -1}. The jet balances the transverse momentum of the W and introduces QCD effects in W boson production. The extraction of the angular coefficients is achieved through the direct measurement of the azimuthal angle of the charged lepton in the Collins-Soper rest-frame of the W boson. The angular coefficients are measured as a function of the transverse momentum of the W boson. The electron, muon, and combined results are in good agreement with the Standard Model prediction, up to order {alpha}{sub s}{sup 2} in QCD.
Date:
April 1, 2005
Creator:
Acosta, D.; Affolder, Anthony A.; Albrow, M. G.; Ambrose, D.; Amidei, D.; Anikeev, K. et al.
Object Type:
Article
System:
The UNT Digital Library
Di-boson production and SM SUSY Higgs searches at the Tevatron
The discovery of the Higgs boson would be a major success for the Standard Model (SM) and would provide further insights into the electroweak symmetry breaking mechanism. This report contains the latest results from the D0 and CDF Tevatron experiments on searches for the SM Higgs produced from gluon fusion with H {yields} WW, and in association with a W boson. It also includes searches for a supersymmetric Higgs in the b{bar b} and {tau}{sup +}{tau}{sup -} decay channels. The study of di-boson production at the Tevatron is important to understand backgrounds in high mass Higgs searches. It also provides a test of the SM through the measurement of the production cross section and the gauge boson self couplings. This paper includes measurements of the WW, W{gamma}, and WZ production cross sections, as well as limits on the anomalous couplings associated with the WW{gamma} and WWZ interactions. The results are based on sets of up to 320 pb{sup -1} of data collected by the D0 and CDF experiments at the {bar p}p Tevatron collider, running at a center-of-mass energy of 1.96 TeV.
Date:
July 1, 2005
Creator:
Elvira, V. Daniel
Object Type:
Article
System:
The UNT Digital Library
Paradyn a parallel nonlinear, explicit, three-dimensional finite-element code for solid and structural mechanics user manual
ParaDyn is a parallel version of the DYNA3D computer program, a three-dimensional explicit finite-element program for analyzing the dynamic response of solids and structures. The ParaDyn program has been used as a production tool for over three years for analyzing problems which range in size from a few tens of thousands of elements to between one-million and ten-million elements. ParaDyn runs on parallel computers provided by the Department of Energy Accelerated Strategic Computing Initiative (ASCI) and the Department of Defense High Performance Computing and Modernization Program. Preprocessing and post-processing software utilities and tools are designed to facilitate the generation of partitioned domains for processors on a massively parallel computer and the visualization of both resultant data and boundary data generated in a parallel simulation. This manual provides a brief overview of the parallel implementation; describes techniques for running the ParaDyn program, tools and utilities; and provides examples of parallel simulations.
Date:
June 1, 2000
Creator:
Hoover, C G; DeGroot, A J & Sherwood, R J
Object Type:
Report
System:
The UNT Digital Library
Wind Energy Benefits
Wind energy provides many benefits, including economic and environmental. This two-sided fact sheet succinctly outlines the top ten wind energy benefits and is especially well suited for general audiences.
Date:
April 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Field Verification Project for Small Wind Turbines, Quarterly Report, October-December 2001, 4th Quarter, Issue No.7
This newsletter provides a brief overview of the Field Verification Project for Small Wind Turbines conducted at the NWTC, along with a description of activities and case studies of projects.
Date:
December 1, 2004
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Properties of High Efficiency CIGS Thin Film Solar Cells
We present experimental results in three areas. Solar cells with an efficiency of 19% have been fabricated with an absorber bandgap in the range of 1.1-1.2 eV. Properties of solar cells fabricated with and without an undoped ZnO layer were compared. The data show that high efficiency cells can be fabricated without using the high-resistivity or undoped ZnO layer. Properties of CIGS solar cells were fabricated from thin absorbers (1 {micro}m) deposited by the three-stage process and simultaneous co-deposition of all the elements. In both cases, solar cells with efficiencies of 16%-17% are obtained.
Date:
February 1, 2005
Creator:
Ramanathan, K.; Keane, J. & Noufi, R.
Object Type:
Article
System:
The UNT Digital Library
Building America Research is Leading the Way to Zero Energy Homes
During times of peak demand, a near zero energy home generates more power than it uses and reduces power demand on the utility provider. In a Florida study, a prototype near zero energy home outperforms a conventional model by providing most of its own power needs throughout the year.
Date:
May 1, 2005
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
H2O Outgassing In and Its Effects on M9787 Silicone
Temperature programmed desorption (TPD) was performed on M9787 silicone, Cab-O-Sil-M-7D (fumed) and Hi-Sil-233 (precipitated) silica particles that had been annealed to 460 K for 24 hours then exposed to different moisture levels. Our results suggest that moisture desorption and adsorption in M9787 can be approximated by the interaction of its silica contents (Cab-O-Sil-M-7D and Hi-Sil-233) with moisture. Our experimental data also reveal that, in general, as heat treated silica particles are exposed to moisture, chemisorbed states, then physisorbed states are gradually filled up in that order. However, there seems to have some rearrangement of bonds as moisture desorbs or absorbs on the surfaces of the silica particles. Nanoindentation was also performed on M9787 silicones that were simultaneously pumped down to a few hundred Pa of residual pressure at room temperature. Our data shows that the removal of physisorbed water in M9787 has none or reversible little effect on the mechanical properties of M9787.
Date:
September 1, 2001
Creator:
Dinh, L N; Schildbach, M A; McLean, W; Balazs, B; LeMay, J D & Balooch, M
Object Type:
Report
System:
The UNT Digital Library
Activities and Accomplishments in MY 2004/FY 2005
From vehicle acquisition and credit trading to exemptions and outreach activity, the Annual Report summarizes the State & Alternative Fuel Provider Activity's accomplishments during MY 2004/FY 2005.
Date:
October 1, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
J.R. Simplot: Burner Upgrade Project Improves Performance and Saves Energy at a Large Food Processing Plant
This DOE Industrial Program case study describes how the J.R. Simplot Company saved energy and money by increasing the efficiency of the steam system in its potato processing plant in Caldwell, Idaho.
Date:
September 1, 2005
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
$1.6 Million in Savings Identified in Anchor Assessment: Plant-Wide Assessment Summary--Glass (Fact Sheet)
Summary of Anchor Glass' plant-wide assessment to identify energy and cost saving opportunities at the corporation's facilities in Warner Robins, GA and Jacksonville, FL.
Date:
August 1, 2003
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Predicting Human Thermal Comfort in Automobiles
The objects of this report are to: (1) increase national energy security by reducing fuel use for vehicle climate control systems; (2) show/demonstrate technology that can reduce the fuel used by LD vehicles' ancillary systems; and (3) develop tools to evaluate the effectiveness of energy-efficient systems including--comfort, cost, practicality, ease-of-use, and reliability.
Date:
June 1, 2005
Creator:
Rugh, J.; Bharathan, D. & Chaney, L.
Object Type:
Presentation
System:
The UNT Digital Library
Sub-microsecond beam notching at low energy
A technique for creating a burst of 100 ns notches (beam extinctions) in an H{sup -} beam at 454 kHz has been developed at {le} 20 keV utilizing a Magnetron ion source with a slit extraction system and a split extractor. Each half of the extractor is treated as part of a 50 ohm transmission line which can be pulsed at {+-} 700 volts creating a 1400 volt gradient across the extractor. A beam current reduction of better than 95% has been observed at the end of the Fermilab 400 MeV Linac. Notched multi-turn charge-exchange injection into the Booster, a 400 MeV to 8 GeV synchrotron, has been demonstrated with a charge reduction in the resulting beam gap of 83%. Presently, the trailing edge of the notch may be adversely affected by space charge resulting in a beam recovery with two different time constants. Efforts to minimize this effect are discussed.
Date:
September 1, 2005
Creator:
Moehs, D. P.
Object Type:
Article
System:
The UNT Digital Library
Development of a Cummins ISL Natural Gas Engine at 1.4g/bhp-hr NOx + NMHC Using PLUS Technology: Final Report
NREL subcontractor report describes Cummins Westport, Inc.'s development of an 8.9 L natural gas engine (320 hp, 1,000 ft-lb peak torque) with CARB emissions certification of 1.4 g/bhp-hr NOx + NMHC.
Date:
July 1, 2005
Creator:
Kamel, M. M.
Object Type:
Report
System:
The UNT Digital Library