60 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Carbon"  
Results: 1 - 24 next
open access

Basic Research Needs: Catalysis for Energy

Description: The report presents results of a workshop held August 6-8, 2007, by DOE SC Basic Energy Sciences to determine the basic research needs for catalysis research.
Date: March 11, 2008
Creator: Bell, Alexis T.; Gates, Bruce C.; Ray, Douglas & Thompson, Michael R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Half-life of 14O

Description: We have measured the half-life of 14O, a superallowed (0+\rightarrow 0+) \beta decay isotope. The 14O was produced by the12C(3He,n)14O reaction using a carbon aerogel target. A low-energy ionbeam of 14O was mass separated and implanted in a thin beryllium foil.The beta particles were counted with plastic scintillator detectors. Wefind \tau 1/2 = 70.696 +- 0.037\sigma. This result is 2.0\sigma higherthan an average value from six earlier experiments, but agrees moreclosely with the most recent p… more
Date: January 11, 2006
Creator: Burke, Jason T.; Vetter, Paul A.; Freedman, Stuart J.; Fujikawa,Brian K. & Winter, Wesley T.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

THE PATH OF CARBON IN PHOTOSYNTHESIS

Description: It is almost sixty years since Emil Fischer was describing on a platform such as this one some of the work which led to the basic knowledge of the structure of glucose and its relatives. Today we will be concerned with a description of the experiments which have led to a knowledge of the principal reactions by which those carbohydrate structures are created by photosynthetic organisms from carbon dioxide and water, using the energy of light. The speculations on the way in which carbohydrate was… more
Date: December 11, 1961
Creator: Calvin, Melvin (Nobel Prize lecture)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

SYNTHESIS AND CHARACTERIZATION OF CARBON AEROGEL NANOCOMPOSITES CONTAINING DOUBLE-WALLED CARBON NANOTUBES

Description: Carbon aerogels (CAs) are novel mesoporous materials with applications such as electrode materials for super capacitors and rechargeable batteries, adsorbents and advanced catalyst supports. To expand the potential application for these unique materials, recent efforts have focused on the design of CA composites with the goal of modifying the structure, conductivity or catalytic activity of the aerogel. Carbon nanotubes (CNTs) possess a number of intrinsic properties that make them promising ma… more
Date: March 11, 2008
Creator: Worsley, M A; Satcher, J H & Baumann, T F
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Sound velocity of carbon at high pressures

Description: We have measured the sound velocity in shock compressed graphite. The data are consistent with a model of solid diamond from 0.8 to 1.4 Mbar. 18 references.
Date: September 11, 1984
Creator: Shaner, J. W.; Brown, J. M.; Swenson, C. A. & McQueen, R. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Deactivation by Carbon of Iron Catalysts for Indirect Liquefaction

Description: This report describes recent progress in a fundamental, three-year investigation of carbon formation and its effects on the activity and selectivity of promoted iron catalysts for Fischer-Tropsch (FT) synthesis, the objectives of which are: determine rates and mechanisms of carbon deactivation of unsupported Fe and Fe/K catalysts during CO hydrogenation over a range of CO concentrations, CO:H{sub 2} ratios, and temperatures; model the rates of deactivation of the same catalysts in fixed-bed rea… more
Date: October 11, 1990
Creator: Bartholomew, C. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Flywheel rotor and containment technology development

Description: The goals of the project are: to develop an economical and practical composite flywheel having an energy density of 88 Wh/kg at failure, an operational energy density of 44 to 55 Wh/kg, and an energy storage capacity of approximately 1 kWh; to determine the suitability of various manufacturing processes for low-cost rotor fabrication; to investigate flywheel and flywheel-systems dynamics; to test and evaluate prototype rotors for use in transportation and stationary applications; and to develop… more
Date: August 11, 1981
Creator: Kulkarni, S.V.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Surface and Electrochemical Behavior of HSLA in Supercritical CO2-H2O Environment

Description: General corrosion was observed on high strength low alloy carbon steel after electrochemical impedance spectroscopy experiments (EIS) performed in H{sub 2}O saturated with CO{sub 2} at 50 C and 15.2 MPa. However, general and localized were observed on the same material surfaces after the EIS experiments performed in supercritical CO{sub 2} containing approximately 6100 ppmv H{sub 2}O at 50 C and 15.2 MPa. The general corrosion areas were uniformly covered by the FeCO{sub 3}-like phase identifie… more
Date: January 11, 2012
Creator: Ziomek-Moroz, M.; Holcomb, G. R.; Tylczak, J.; Beck, J.; Fedkin, M. & Lvov, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

GENOME-ENABLED DISCOVERY OF CARBON SEQUESTRATION GENES IN POPLAR

Description: Plants utilize carbon by partitioning the reduced carbon obtained through photosynthesis into different compartments and into different chemistries within a cell and subsequently allocating such carbon to sink tissues throughout the plant. Since the phytohormones auxin and cytokinin are known to influence sink strength in tissues such as roots (Skoog & Miller 1957, Nordstrom et al. 2004), we hypothesized that altering the expression of genes that regulate auxin-mediated (e.g., AUX/IAA or ARF tr… more
Date: October 11, 2007
Creator: Davis, J. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Final Report: Characterization of Hydrogen Adsorption in Carbon-Based Materials by NMR

Description: In support of DOE/EERE's Fuel Cell Technologies Program Hydrogen Sorption Center of Excellence (HSCoE), UNC conducted Nuclear Magnetic Resonance (NMR) measurements that contributed spectroscopic information as well as quantitative analysis of adsorption processes. While NMR based Langmuir isotherms produce reliable H2 capacity measurements, the most astute contribution to the center is provided by information on dihydrogen adsorption on the scale of nanometers, including the molecular dynamics … more
Date: July 11, 2011
Creator: Wu, Yue & Kleinhammes, Alfred
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

2010 IRON-SULFUR ENZYMES GORDON RESEARCH CONFERENCE, JUNE 6-11, 2010

Description: Iron-sulfur (FeS) centers are essential for biology and inspirational in chemistry. These protein cofactors are broadly defined as active sites in which Fe is coordinated by S-donor ligands, often in combination with extra non-protein components, for example, additional metal atoms such as Mo and Ni, and soft ligands such as CN{sup -} and CO. Iron-sulfur centers are inherently air sensitive: they are found in essentially all organisms and it is possible that they were integral components of the… more
Date: June 11, 2010
Creator: Gray, Nancy Ryan
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Pursuing Energy Efficiency as a Hedge against Carbon Regulatory Risks: Current Resource Planning Practices in the West

Description: Uncertainty surrounding the nature and timing of future carbon regulations poses a fundamental and far-reaching financial risk for electric utilities and their ratepayers. Long-term resource planning provides a potential framework within which utilities can assess carbon regulatory risk and evaluate options for mitigating exposure to this risk through investments in energy efficiency and other low-carbon resources. In this paper, we examine current resource planning practices related to managin… more
Date: July 11, 2008
Creator: Barbose, Galen; Wiser, Ryan; Phadke, Amol & Goldman, Charles
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Understanding the mechanism of nanotube synthesis for controlled production of specific (n,m) structures

Description: This report shows the extensive research on the mechanism responsible for the formation of single walled carbon nanotubes in order to get control over their structural parameters (diameter and chirality). Catalyst formulations, pre-treatment conditions, and reaction conditions are described in detail as well as mechanisms to produce nanotubes structures of specific arrays (vertical forest, nanotube pillars). Applications of SWNT in different fields are also described in this report. In relation… more
Date: February 11, 2010
Creator: Resasco, Daniel E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Research Progress Meeting for March 11,1948

Description: The linear accelerator is again in operation after a shutdown fore repairs and minor changes. Radiofrequency checks of the instrument were made while the Van de Graaff was open. The vacuum of the system is now very good, the base pressure being 1.7 x 10{sup -6} mm Hg with a rate of rise of 800 s/{micro}s. Some preliminary results have been obtained on the activation of carbon with protons. The experiments were done using 10 mil, 50 mg/cm{sup 2} polystyrene discs. The activation curve obtained i… more
Date: March 11, 1948
Creator: Wakerling, R.K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational Modeling and Assessment Of Nanocoatings for Ultra Supercritical Boilers

Description: Forced outages and boiler unavailability in conventional coal-fired fossil power plants is most often caused by fireside corrosion of boiler waterwalls. Industry-wide, the rate of wall thickness corrosion wastage of fireside waterwalls in fossil-fired boilers has been of concern for many years. It is significant that the introduction of nitrogen oxide (NOx) emission controls with staged burners systems has increased reported waterwall wastage rates to as much as 120 mils (3 mm) per year. Moreov… more
Date: April 11, 2011
Creator: Gandy, David W. & Shingledecker, John P.
Item Type: Refine your search to only Text
Partner: UNT Libraries Government Documents Department
open access

Special Issue for the 9th International Conference on Carbonaceous Particles in the Atmosphere

Description: Carbonaceous particles are a minor constituent of the atmosphere but have a profound effect on air quality, human health, visibility and climate. The importance of carbonaceous particles has been increasingly recognized and become a mainstream topic at numerous conferences. Such was not the case in 1978, when the 1st International Conference on Carbonaceous Particles in the Atmosphere (ICCPA), or ''Carbon Conference'' as it is widely known, was introduced as a new forum to bring together scient… more
Date: December 11, 2009
Creator: Strawa, A.W.; Kirchstetter, T.W. & Puxbaum, H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

2011 Computation Directorate Annual Report

Description: From its founding in 1952 until today, Lawrence Livermore National Laboratory (LLNL) has made significant strategic investments to develop high performance computing (HPC) and its application to national security and basic science. Now, 60 years later, the Computation Directorate and its myriad resources and capabilities have become a key enabler for LLNL programs and an integral part of the effort to support our nation's nuclear deterrent and, more broadly, national security. In addition, the … more
Date: April 11, 2012
Creator: Crawford, D. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An Ab Initio Approach Towards Engineering Fischer-Tropsch Surface Chemistry

Description: As the US seeks to develop an energy strategy that reduces the reliance on foreign oil, there is a renewed interest in the research and development of the Fischer Tropsch synthesis for converting syngas into long chain hydrocarbon products. This report investigates some of the basic elementary steps for Fischer-Tropsch synthesis over ideal Pt, Ru and carbon-covered Pt and Ru metal surfaces by using ab initio density functional theoretical calculations. We examine in detail the adsorption sites … more
Date: September 11, 2003
Creator: Neurock, Matthew & Chopra, Siddharth
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Factors Influencing the Quality of Carbon Coatings onLiFePO4

Description: Several LiFePO4/C composites were prepared and characterizedelectrochemically in lithium half-cells. Pressed pellet conductivitiescorrelated well with the electrochemical performance in lithiumhalf-cells. It was found that carbon structural factors such as sp2/sp3,D/G, and H/C ratios, as determined by Raman spectroscopy and elementalanalysis, influenced the conductivity and rate behavior strongly. Thestructure of the residual carbon could be manipulated through the use ofadditives during LiFePO… more
Date: October 11, 2006
Creator: Wilcox, James D.; Doeff, Marca M.; Marcinek, Marek & Kostecki,Robert
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Journal Article, full text

Description: Single-wall carbon nanotube #1;SWCNT#2; networks form a highly transparent and electrically conductive thin film that can be used to replace traditional transparent conducting oxides #1;TCOs#2; in a variety of applications. Here, the authors demonstrate their use as a transparent back contact in a near-infrared #1;NIR#2; transparent CdTe solar cell. SWCNT networks are hole-selective conductors and have a significantly greater NIR transparency than TCOs—qualities which could both make them very … more
Date: June 11, 2007
Creator: Barnes, T. M.; Wu, X.; Zhou, J.; Duda, A.; Lagemaat, J. van de; Weeks, C. L. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Storage Viability and Optimization Web Service

Description: Non-residential sectors offer many promising applications for electrical storage (batteries) and photovoltaics (PVs). However, choosing and operating storage under complex tariff structures poses a daunting technical and economic problem that may discourage potential customers and result in lost carbon and economic savings. Equipment vendors are unlikely to provide adequate environmental analysis or unbiased economic results to potential clients, and are even less likely to completely describe … more
Date: October 11, 2010
Creator: Stadler, Michael; Marnay, Christ; Lai, Judy; Siddiqui, Afzal; Limpaitoon, Tanachai; Phan, Trucy et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of Continuous Solvent Extraction Processes for Coal Derived Carbon Products Quarterly Report

Description: The purpose of this DOE-funded effort is to develop continuous processes for solvent extraction of coal for the production of carbon products. These carbon products include materials used in metals smelting, especially in the aluminum and steel industries, as well as porous carbon structural material referred to as ''carbon foam'' and carbon fibers. During this reporting period, efforts have focused on the facility modifications for continuous hydrotreating, as well as developing improved proto… more
Date: August 11, 2005
Creator: Kennel, Elliot B.; Carpenter, Stephen P.; Dadyburjor, Dady; Katakdaunde, Manoj; Magean, Liviu; Stansberry, Peter G. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen