Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports (open access)

Attrition Resistant Fischer-Tropsch Catalysts Based on FCC Supports

Commercial spent fluid catalytic cracking (FCC) catalysts provided by Engelhard and Albemarle were used as supports for Fe-based catalysts with the goal of improving the attrition resistance of typical F-T catalysts. Catalysts with the Ruhrchemie composition (100 Fe/5 Cu/4.2 K/25 spent FCC on mass basis) were prepared by wet impregnation. XRD and XANES analysis showed the presence of Fe{sub 2}O{sub 3} in calcined catalysts. FeC{sub x} and Fe{sub 3}O{sub 4} were present in the activated catalysts. The metal composition of the catalysts was analyzed by ICP-MS. F-T activity of the catalysts activated in situ in CO at the same conditions as used prior to the attrition tests was measured using a fixed bed reactor at T = 573 K, P = 1.38 MPa and H{sub 2}:CO ratio of 0.67. Cu and K promoted Fe supported over Engelhard provided spent FCC catalyst shows relatively good attrition resistance (8.2 wt% fines lost), high CO conversion (81%) and C{sub 5}+ hydrocarbons selectivity (18.3%).
Date: February 5, 2010
Creator: Adeyiga, Adeyinka
Object Type: Report
System: The UNT Digital Library
Erosion-Resistant Nanocoatings for Improved Energy Efficiency in Gas Turbines (open access)

Erosion-Resistant Nanocoatings for Improved Energy Efficiency in Gas Turbines

The objective of this Stage Gate IV project was to test and substantiate the viability of an erosion‐resistant nanocoating for application on compressor airfoils for gas turbines in both industrial power generation and commercial aviation applications. To effectively complete this project, the National Energy Technology Laboratory’s Office of Research & Development teamed with MDS Coating Technologies Inc. (MCT), Delta Air Lines ‐ Technical Operations Division (Delta Tech Ops), and Calpine Corporation. The coating targeted for this application was MCT’s Next Generation Coating, version 4 (NGC‐v4 ‐ with the new registered trademark name of BlackGold®). The coating is an erosion and corrosion resistant composite nanostructured coating. This coating is comprised of a proprietary ceramic‐metallic nano‐composite construction which provides enhanced erosion resistance and also retains the aerodynamic geometry of the airfoils. The objective of the commercial aviation portion of the project was to substantiate the coating properties to allow certification from the FAA to apply an erosion‐resistant coating in a commercial aviation engine. The goal of the series of tests was to demonstrate that the durability of the airfoils is not affected negatively with the application of the NGC v4 coating. Tests included erosion, corrosion, vibration and fatigue. The results of the …
Date: February 5, 2014
Creator: Alman, David & Marcio, Duffles
Object Type: Report
System: The UNT Digital Library
Paleoclimatic implications of glacial and postglacial refugia for Pinus pumila in western Beringia (open access)

Paleoclimatic implications of glacial and postglacial refugia for Pinus pumila in western Beringia

Palynological results from Julietta Lake currently provide the most direct evidence to support the existence of a glacial refugium for Pinus pumila in mountains of southwestern Beringia. Both percentages and accumulation rates indicate the evergreen shrub survived until at least {approx}19,000 14C yr B.P. in the Upper Kolyma region. Percentage data suggest numbers dwindled into the late glaciation, whereas pollen accumulation rates point towards a more rapid demise shortly after {approx}19,000 14C yr B.P. Pinus pumila did not re-establish in any great numbers until {approx}8100 14C yr B.P., despite the local presence {approx}9800 14C yr B.P. of Larix dahurica, which shares similar summer temperature requirements. The postglacial thermal maximum (in Beringia {approx}11,000-9000 14C yr B.P.) provided Pinus pumila shrubs with equally harsh albeit different conditions for survival than those present during the LGM. Regional records indicate that in this time of maximum warmth Pinus pumila likely sheltered in a second, lower-elevation refugium. Paleoclimatic models and modern ecology suggest that shifts in the nature of seasonal transitions and not only seasonal extremes have played important roles in the history of Pinus pumila over the last {approx}21,000 14C yr B.P.
Date: February 5, 2010
Creator: Anderson, P M; Lozhkin, A V; Solomatkina, T B & Brown, T A
Object Type: Article
System: The UNT Digital Library
A Harmonic Approach for Calculating Daily Temperature Normals Constrained by Homogenized Monthly Temperature Normals (open access)

A Harmonic Approach for Calculating Daily Temperature Normals Constrained by Homogenized Monthly Temperature Normals

A report offering a constrained harmonic technique that forces the daily temperature normals to be consistent with the monthly temperature normals that NOAA archived between 1981 and 2010.
Date: February 5, 2013
Creator: Arguez, Anthony & Applequist, Scott
Object Type: Report
System: The UNT Digital Library
Discretionary Budget Authority by Subfunction: An Overview (open access)

Discretionary Budget Authority by Subfunction: An Overview

This report presents figures showing trends in discretionary budget authority as a percentage of gross domestic product (GDP) by subfunction within each of 17 budget function categories, using data from President Obama's FY2016 budget submission. This report provides a graphical overview of historical trends in discretionary budget authority from FY1977 through FY2014, estimates for FY2015 spending, and the levels consistent with the President's proposals for FY2016 through FY2020.
Date: February 5, 2015
Creator: Austin, D. Andrew
Object Type: Report
System: The UNT Digital Library
Results For The Fourth Quarter 2012 Tank 50 WAC Slurry Sample: Chemical And Radionuclide Contaminants (open access)

Results For The Fourth Quarter 2012 Tank 50 WAC Slurry Sample: Chemical And Radionuclide Contaminants

This report details the chemical and radionuclide contaminant results for the characterization of the 2012 Fourth Quarter sampling of Tank 50 for the Saltstone Waste Acceptance Criteria (WAC).Information from this characterization will be used by Waste Solidification Engineering (WSE) to support the transfer of low-level aqueous waste from Tank 50 to the Salt Feed Tank in the Saltstone Facility in Z-Area, where the waste will be immobilized. This information is also used to update the Tank 50 Waste Characterization System. The following conclusions are drawn from the analytical results provided in this report: The concentration of the reported chemical and radioactive contaminants were less than their respective WAC Limits and Targets, unless noted in this section; Norpar 13 and Isopar L have higher detection limits compared with the Saltstone WAC. The data provided in this report is based upon the concentrations in the sub-sample, and due to the limited solubility in aqueous solution, may not represent the concentrations of the analytes in Tank 50; Diisooctyl adipate (or diisooctyl hexanedioate) and 5-methyl-3-hexanol, plasticizers, were measured at 1.30E+00 mg/L and 3.00E+00 mg/L, respectively, in one of two replicate measurements conducted on an at-depth sample. The organic analysis of the at-depth sample was …
Date: February 5, 2013
Creator: Bannochie, C. J.
Object Type: Report
System: The UNT Digital Library
Saudi Arabia: Background and U.S. Relations (open access)

Saudi Arabia: Background and U.S. Relations

This report discusses the kingdom of Saudi Arabia's relations with the United States; its stability, and its future trajectory are subjects of continuing congressional interest.
Date: February 5, 2016
Creator: Blanchard, Christopher M.
Object Type: Report
System: The UNT Digital Library
Gulf Petro Initiative (open access)

Gulf Petro Initiative

In this report, technologies for petroleum production and exploration enhancement in deepwater and mature fields are developed through basic and applied research by: (1) Designing new fluids to efficiently drill deepwater wells that can not be cost-effectively drilled with current technologies. The new fluids will be heavy liquid foams that have low-density at shallow dept to avoid formation breakdown and high density at drilling depth to control formation pressure. The goal of this project is to provide industry with formulations of new fluids for reducing casing programs and thus well construction cost in deepwater development. (2) Studying the effects of flue gas/CO{sub 2} huff n puff on incremental oil recovery in Louisiana oilfields bearing light oil. An artificial neural network (ANN) model will be developed and used to map recovery efficiencies for candidate reservoirs in Louisiana. (3) Arriving at a quantitative understanding for the three-dimensional controlled-source electromagnetic (CSEM) geophysical response of typical Gulf of Mexico hydrocarbon reservoirs. We will seek to make available tools for the qualitative, rapid interpretation of marine CSEM signatures, and tools for efficient, three-dimensional subsurface conductivity modeling.
Date: February 5, 2011
Creator: Boukadi, Fathi
Object Type: Report
System: The UNT Digital Library
The Renewable Fuel Standard (RFS): Waiver Authority and Modification of Volumes (open access)

The Renewable Fuel Standard (RFS): Waiver Authority and Modification of Volumes

This report discusses the renewable fuel standard which require a certain level of bio-fuel (usually ethanol) to be included in gas and the issuance of the 2018 rule by the Environmental Protection Agency (EPA).
Date: February 5, 2018
Creator: Bracmort, Kelsi
Object Type: Report
System: The UNT Digital Library
RTE1, A Novel Regulator of Ethylene Receptor Function (open access)

RTE1, A Novel Regulator of Ethylene Receptor Function

RTE1 is a novel conserved gene found in both plants and animals. The main aims of this project were to: 1) examine Arabidopsis RTE1 function using genetic and cell biological analyses, and 2) determine whether the Arabidopsis RTH gene plays a role similar to that of RTE1 in ethylene signaling.
Date: February 5, 2013
Creator: Chang, Caren
Object Type: Report
System: The UNT Digital Library
Ocean Energy Agency Appropriations, FY2016 (open access)

Ocean Energy Agency Appropriations, FY2016

This report discusses FY2016 appropriations for the Department of the Interior's (DOI's) Bureau of Ocean Energy Management (BOEM), Bureau of Safety and Environmental Enforcement (BSEE), and Office of Natural Resources Revenue (ONRR)--the three agencies that collectively administer federal ocean energy resources covering more than 1.7 billion acres on the U.S. outer continental shelf (OCS).
Date: February 5, 2016
Creator: Comay, Laura B. & Humphries, Marc
Object Type: Report
System: The UNT Digital Library
Congressional Liaison Offices of Selected Federal Agencies (open access)

Congressional Liaison Offices of Selected Federal Agencies

This report lists about 200 congressional liaison offices and is intended to help congressional offices in placing telephone calls and addressing correspondence to government agencies. The information was supplied by the appropriate agency and is current as of the date of publication. Entries are arranged alphabetically in four sections: legislative branch; judicial branch; executive branch; and agencies, boards, and commissions.
Date: February 5, 2018
Creator: Crane-Hirsch, Audrey Celeste
Object Type: Report
System: The UNT Digital Library
Congressional Roll Call Votes on the Keystone XL Pipeline (open access)

Congressional Roll Call Votes on the Keystone XL Pipeline

This report provides roll call vote data related to the proposed TransCanada Keystone XL Pipeline that would transport oil sands crude from Canada and shale oil produced in North Dakota and Montana to a market hub in Nebraska for further delivery to Gulf Coast refineries. Voting information is listed chronologically and broken down by chamber, Congress, and type of legislation.
Date: February 5, 2015
Creator: Cunningham, Lynn J. & Cook, Beth
Object Type: Report
System: The UNT Digital Library
Nutrition Labeling of Restaurant Menu and Vending Machine Items (open access)

Nutrition Labeling of Restaurant Menu and Vending Machine Items

This report discusses nutrition labeling for items on restaurant menus, in vending machines, prepared food at groceries, and entertainment venues which is required by the Patient Protection and Affordable Care Act passed in 2010 but now due to be fully implemented in May 2018.
Date: February 5, 2018
Creator: Dabrowska, Agata
Object Type: Report
System: The UNT Digital Library
Streamlining and Refining FEDS Loads Models - Final Report (open access)

Streamlining and Refining FEDS Loads Models - Final Report

The Facility Energy Decision System (FEDS) software is a powerful buildings energy analysis tool developed by Battelle at the Pacific Northwest National Laboratory with support from numerous organizations including several within the U.S. Department of Energy (DOE) and U.S. Department of Defense (DoD). FEDS is used extensively throughout the federal sector to examine building energy efficiency potential and recommend energy saving retrofit projects. The focus of this CRADA was to update the foundation of the FEDS loads models, to improve the core functionality and calculation methods and position the building efficiency analysis software for continued growth. The broader intent was to increase FEDS utility and user satisfaction via improving modeling accuracy, facilitating development and making possible a wide range of new and desired capability enhancements. This report provides an summary of the various tasks performed under the CRADA.
Date: February 5, 2013
Creator: Dahowski, Robert T. & Dirks, James A.
Object Type: Report
System: The UNT Digital Library
NEUTRON MULTIPLICITY AND ACTIVE WELL NEUTRON COINCIDENCE VERIFICATION MEASUREMENTS PERFORMED FOR MARCH 2009 SEMI-ANNUAL DOE INVENTORY (open access)

NEUTRON MULTIPLICITY AND ACTIVE WELL NEUTRON COINCIDENCE VERIFICATION MEASUREMENTS PERFORMED FOR MARCH 2009 SEMI-ANNUAL DOE INVENTORY

The Analytical Development (AD) Section field nuclear measurement group performed six 'best available technique' verification measurements to satisfy a DOE requirement instituted for the March 2009 semi-annual inventory. The requirement of (1) yielded the need for SRNL Research Operations Department Material Control & Accountability (MC&A) group to measure the Pu content of five items and the highly enrich uranium (HEU) content of two. No 14Q-qualified measurement equipment was available to satisfy the requirement. The AD field nuclear group has routinely performed the required Confirmatory Measurements for the semi-annual inventories for fifteen years using sodium iodide and high purity germanium (HpGe) {gamma}-ray pulse height analysis nondestructive assay (NDA) instruments. With appropriate {gamma}-ray acquisition modeling, the HpGe spectrometers can be used to perform verification-type quantitative assay for Pu-isotopics and HEU content. The AD nuclear NDA group is widely experienced with this type of measurement and reports content for these species in requested process control, MC&A booking, and holdup measurements assays Site-wide. However none of the AD HpGe {gamma}-ray spectrometers have been 14Q-qualified, and the requirement of reference 1 specifically excluded a {gamma}-ray PHA measurement from those it would accept for the required verification measurements. The requirement of reference 1 was a new …
Date: February 5, 2010
Creator: Dewberry, R.; Ayers, J.; Tietze, F. & Klapper, K.
Object Type: Article
System: The UNT Digital Library
The Artisanal Nuke (open access)

The Artisanal Nuke

None
Date: February 5, 2014
Creator: Dixon, M C
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Guide to Describing the Income Distribution (open access)

A Guide to Describing the Income Distribution

This report provides descriptive analysis of the U.S. income distribution to illustrate various concepts. First, it examines the complexities of income measurement and important definitional and data considerations to bear in mind when using and interpreting income statistics. Next, it describes two popular data sources used to study the U.S. income distribution, followed by sections on statistics commonly used to provide point-in-time analysis and to compare U.S. income across groups, time, and location. The report concludes with an explanation of the Gini index.
Date: February 5, 2015
Creator: Donovan, Sarah A.
Object Type: Report
System: The UNT Digital Library
What Does the Gig Economy Mean for Workers? (open access)

What Does the Gig Economy Mean for Workers?

This report provides an overview of the gig economy -- i.e., the collection of markets that match providers to consumers on a gig (or job) basis in support of on-demand commerce (e.g., Uber, TaskRabbit) -- and identifies legal and policy questions relevant to its workforce.
Date: February 5, 2016
Creator: Donovan, Sarah A.; Bradley, David H. & Shimabukuro, Jon O.
Object Type: Report
System: The UNT Digital Library
Frequency stabilization via the mixed mode in three mode HeNe lasers (open access)

Frequency stabilization via the mixed mode in three mode HeNe lasers

This paper describes a three mode HeNe laser frequency stabilization technique using the mixed mode frequency to obtain a fractional frequency stability of 2 x 10{sup -11}. The mixed mode frequency occurs due to optical nonlinear interactions with the adjacent modes at each of the three modes. In precision displacement interferometry systems, the laser source frequency must be stabilized to provide an accurate conversion ratio between phase change and displacement. In systems, such as lithography applications, which require high speed, high accuracy and low data age uncertainty, it is also desirable to avoid periodic nonlinearities, which reduces computation time and errors. One method to reduce periodic nonlinearity is to spatially separate the measurement and reference beams to prevent optical mixing, which has been shown for several systems. Using spatially separated beams and the proper optical configuration, the interferometer can be fiber fed, which can increase the interferometer's stability by reducing the number of beam steering optical elements. Additionally, as the number of measurement axes increases, a higher optical power from the laser source is necessary.
Date: February 5, 2010
Creator: Ellis, J D; Joo, K; Buice, E S; Spronck, J W & Munnig Schmidt, R H
Object Type: Article
System: The UNT Digital Library
Air Quality: EPA’s 2013 Changes to the Particulate Matter (PM) Standard (open access)

Air Quality: EPA’s 2013 Changes to the Particulate Matter (PM) Standard

This report summarizes the Environmental Protection Agency's (EPA) proposed changes to the National Ambient Air Quality Standard (NAAQS) and includes comparisons with previous (1997 and 2006) promulgated and proposed standards.
Date: February 5, 2013
Creator: Esworthy, Robert
Object Type: Report
System: The UNT Digital Library
National Commission on the Future of the Army (NCFA): Background and Issues for Congress (open access)

National Commission on the Future of the Army (NCFA): Background and Issues for Congress

This report discusses the the National Commission on the Future of the Army (NCFA), which was established to conduct a comprehensive study of the structure of the Army. The NCFA reported its findings to Congress and the Administration on January 28, 2016, and made a number of recommendations that may or may not be acted upon.
Date: February 5, 2016
Creator: Feickert, Andrew
Object Type: Report
System: The UNT Digital Library
Vulnerable Youth: Employment and Job Training Programs (open access)

Vulnerable Youth: Employment and Job Training Programs

This report provides an overview of federal employment programs for vulnerable young people. It begins with a discussion of the current challenges in preparing all youth today for the workforce. The report hen provides a chronology of job training and employment programs for at-risk youth that began in the 1930s.
Date: February 5, 2010
Creator: Fernandes, Adrienne L.
Object Type: Report
System: The UNT Digital Library
Federal Laws Relating to Cybersecurity: Overview and Discussion of Proposed Revisions (open access)

Federal Laws Relating to Cybersecurity: Overview and Discussion of Proposed Revisions

This report discusses that framework and proposals to amend more than 30 acts of Congress that are part of or relevant to it.
Date: February 5, 2013
Creator: Fischer, Eric A.
Object Type: Report
System: The UNT Digital Library