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  • 1
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    Microseepage of methane to the atmosphere from the Dawanqi oil-gas field, Tarim Basin, China (2018)
    Details
    Publication Date: 2018-02-16
    Description: The microseepage of natural gas from subsurface hydrocarbon reservoirs is a widespread process in petroleum basins. On a global scale, microseepage represents an important natural source of atmospheric methane (CH4). To date, microseepage CH4 flux data have been obtained from ~20 petroleum systems in North America, Europe, and Asia. While the seasonal variations of gas flux due to soil methanotrophic activity are known, the role of geological factors in controlling gas fluxes has been poorly investigated. Here we present new microseepage data from the Dawanqi oil-gas field located within the Tarim Basin (China), a petroleum system characterized by intense faulting and shallow (〈700 m) reservoirs. We measured CH4 fluxes from the ground at 51 sites along three transects by using a closed-chamber connected to a portable gas sensor using off-axis integrated cavity output spectroscopy. Our results indicate that the highest CH4 fluxes occur over faults and/or shallow reservoirs, especially those that were not developed and that have higher fluid pressures. Microseeping CH4 is thermogenic, like that occurring within the Dawanqi reservoirs, as demonstrated by 13C enrichment (δ13C from 46.3‰to 30.7‰) in the chamber. Mean and range microseepage values (17 mg m 2d 1; from 1.4 to 330 mg m 2d 1) are similar to those reported for other petroleum fields with active tectonics. Our results confirm that dry soil over petroleum fields can be a net source of atmospheric CH4 and its flux is primarily controlled by faulting, and reservoir depth and pressure. These factors shall be considered in global bottom-up seepage emission estimates.
    Description: Published
    Description: 4353–4363
    Description: 6A. Geochimica per l'ambiente
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
    Electronic Resource
    Electronic Resource
    Chemistry of oxaziridines. 17. N-(Phenylsulfonyl)(3,3-dichlorocamphoryl)oxaziridine: a highly efficient reagent for the asymmetric oxidation of sulfides to sulfoxides (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 1428-1437 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00030a045
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  • 3
    Electronic Resource
    Electronic Resource
    An Interactive Web-Based Learning System for Manufacturing Technology Education (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 505-507 (Jan. 2006), p. 1111-1116 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Manufacturing engineering education is science & technology based subjects that are traditionally the hardest to teach online because of the need for providing practice & hands-on experiences at a distance. Therefore, this research aims to develop an e-learning system to teach manufacturing technology and to enhance the quality, scale, and breadth of technological education. The major results of this research are; (1).Establish interactive on-line teaching material for the computer-aided manufacturing courses including CNC coding method, CNC simulation. (2).Propose the interactive teaching strategies for the students to learn machining process planning through web-based learning system. (3).Integrate multi-media and virtual laboratory in the developed interactive e-learning system to enhance the effectiveness of machining education through web-based system. (4).Enhance students the ability to extract the manufacturing features from a mechanical drawing in either 2D or 3D. (5). Cultivate the principle of manufacturing process planning through the developed interactive web-based learning system. (6). Discipline CNC programming and CNC machining techniques through Internet
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/12/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.505-507.1111.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Hot Extrusion on the Structure and Thermoelectric Properties of Bi〈sub〉2〈/sub〉Te〈sub〉3〈/sub〉 Material (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 1549-1552 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Bismuth telluride material was fabricated using hot extrusion. The crystal structure wasidentified by X-ray diffraction and Scanning electron microscopy. The oriented texture in extrusiondirection was formed. All the samples showed high mechanical strength. The thermoelectricproperties were determined by measuring electrical resistivity, Seebeck coefficient and thermalconductivity. The influence of extrusion temperature on the thermoelectric performence was studied.The variation of figure with temperature was also studied. The oriented texture seems promising toimprove thermoelectric properties and mechanical strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.1549.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Rotational actuators based on carbon nanotubes (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 424 (2003), S. 408-410 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Nanostructures are of great interest not only for their basic scientific richness, but also because they have the potential to revolutionize critical technologies. The miniaturization of electronic devices over the past century has profoundly affected human communication, computation, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01823
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  • 6
    Electronic Resource
    Electronic Resource
    The nuclear hormone receptor Ftz-F1 is a cofactor for the Drosophila homeodomain protein Ftz (1997)
    [s.l.] : Nature Publishing Group
    Nature 385 (1997), S. 552-555 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ftz is a segmentation gene of the pair-rule class located in the Antennapedia (Antp) complex4. Although its homeodomain and in vitro binding specificity is very similar to other Antp-class proteins5'6, its role in embryos is unique: loss-of-function ftz mutations produce deletions of even-numbered ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/385552a0
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  • 7
    Electronic Resource
    Electronic Resource
    Selective, Electrophilic Fluorinations Using N-Fluoro-o-benzenedisulfonimide (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 4730-4737 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00120a014
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  • 8
    Electronic Resource
    Electronic Resource
    Pyrolytically grown arrays of highly aligned BxCyNz nanotubes (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 2769-2771 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A pyrolysis route has been used to synthesize arrays of highly aligned BxCyNz nanotubes in bulk. The structure and composition of the product were characterized by scanning electron microscopy, high-resolution transmission electron microscopy, and electron energy-loss spectroscopy. The length and diameter of the nanotubes are quite uniform in a large area of the reaction zone. The sizes of the aligned BxCyNz nanotubes from the whole reaction zone are 10–30 μm in length and 20–140 nm in diameter. The x/z ratio of BxCyNz nanotubes for most nanotubes is about 1:1. The x/y ratio of BxCyNz nanotubes is up to 0.6. Within one nanotube, the x/y ratio is usually heterogeneous. The growth mechanism is also discussed. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1369620
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  • 9
    Electronic Resource
    Electronic Resource
    Aligned CNx nanotubes by pyrolysis of ferrocene/C60 under NH3 atmosphere (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 1807-1809 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Aligned CNx (x〈0.1) nanotubes have been generated by pyrolyzing ferrocene/C60 mixtures at 1050 °C in an ammonia atmosphere. The structure and composition of the product were determined by high-resolution transmission electron microscopy and high spatial resolution electron energy-loss spectroscopy. The CNx tubes (15–70 nm diameter, 〈50 μm length) grown in large flakes (〈3 mm2) consist of a reduced number of "graphitic" layers (〈15 on either side) arranged in a bamboo-like structure. Areas of high nitrogen concentration were found within curved or corrugated "graphite-like" domains. The observation of a well-developed double peak in the σ* feature of the N K-edge suggests that the material has not undergone the transition to the fullerene-like phase known for nitrogenated carbons. Incorporation of nitrogen from the gas phase (NH3) into CNx nanotubes therefore leads to improved and more efficient N substitution into the network as compared to the synthesis with solid nitrogen-containing precursors reported earlier. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1311813
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  • 10
    Electronic Resource
    Electronic Resource
    Pyrolysis approach to the synthesis of gallium nitride nanorods (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 303-305 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Herein we describe a pyrolysis route to the synthesis of gallium nitride (GaN) nanorods. GaN nanorods have been grown by the pyrolysis of gallium dimethylamide and ferrocene under an ammonia atmosphere. High-resolution transmission electron microscopy and energy dispersive x-ray spectrometer show that they are GaN single crystals, the sizes of which vary from 3 to 30 μm in length and 15 to 70 nm in diameter. Iron acts as an important catalyst for the GaN nanorod growth. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1431401
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