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  • American Institute of Physics  (602,932)
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  • 1
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Papers in mathematical physics - that is, the application of mathematics to problems in physics and the development of mathematical methods suitable for such applications and for the formulation of physical theories
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: PHF online publishes articles that emphasize understanding of the physics underlying modern technology. The subject coverage includes, but is not limited to, experimental or theoretical physics applied to all aspects of materials: for example, charge and mass transport, superconductivity magnetism; surfaces, interfaces, thin films, crystal lattice defects; electrical, optical, magnetic, and structural properties; processing; ion implantation. Materials covered include semiconductors, superconductors, metals and alloys, amorphous materials, and oxides.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 2015-11-25
    Description: Gas-hydrate accumulations located onshore in Arctic permafrost regions are seen as a potential source of natural gas. Surprisingly, most of the gas hydrate found in the Mackenzie Delta and Beaufort Sea areas was indirectly discovered or inferred from conventional hydrocarbon exploration programs. One of these occurrences, the Mallik gas-hydrate field (Figure 1), has received particular attention over the last 10 years. Two internationally partnered research well programs have intersected three intervals of gas hydrates and have allowed successful extraction of subpermafrost core samples with significant gas hydrates. The gas-hydrate intervals are up to 40 m thick and have high gas-hydrate saturation, sometimes exceeding 80% of pore volume of unconsolidated clastic sediments with average porosities from 25–40%. At Mallik, the gas-hydrate intervals are located at depths of 900–1100 m and are localized on the crest of an anticline.
    Type: Article , PeerReviewed
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  • 4
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    American Institute of Physics
    In:  The Leading Edge, 27 (2). pp. 258-265.
    Publication Date: 2015-12-16
    Description: The definition of noise and signal in seismic data will vary widely with the viewer's perspective and methods to process and visualize the data. Thus we begin with our definition from the perspective of presenting structural subsurface information.
    Type: Article , PeerReviewed
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  • 5
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    American Institute of Physics
    In:  The Leading Edge, 21 (7). pp. 686-689.
    Publication Date: 2016-07-13
    Description: As offshore petroleum exploration and development move into deeper water, industry must contend increasingly with gas hydrate, a solid compound that binds water and a low-molecular-weight gas (usually methane). Gas hydrate has been long studied in industry from an engineering viewpoint, due to its tendency to clog gas pipelines. However, hydrate also occurs naturally wherever there are high pressures, low temperatures, and sufficient concentrations of gas and water. These conditions prevail in two natural environments, both of which are sites of active exploration: permafrost regions and marine sediments on continental slopes. In this article we discuss seismic detection of gas hydrate in marine sediments. Gas hydrate in deepwater sediments poses both new opportunities and new hazards. An enormous quantity of natural gas, likely far exceeding the global inventory of conventional fossil fuels, is locked up worldwide in hydrates. Ex-traction of this unconventional resource presents unique exploration, engineering, and economic challenges, and several countries, including the United States, Japan, Canada, India, and Korea, have initiated joint industry-academic-governmental programs to begin studying those challenges. Hydrates also constitute a potential drilling hazard. Because hydrates are only stable in a restricted range of pressure and temperature, any activity that sufficiently raises temperature or lowers pressure could destabilize them, releasing potentially large volumes of gas and decreasing the shear strength of the host sediments. Assessment of the opportunities and hazards associated with hydrates requires reliable methods of detecting hydrate and accurate maps of their distribution and concentration. Hydrate may occur only within the upper few hundred meters of deepwater sediment, at any depth between the seafloor and the base of the stability zone, which is controlled by local pressure and temperature. Hydrate is occasionally exposed at the seafloor, where it can be detected either visually or acoustically by strong seismic reflection amplitudes or high backscatter …
    Type: Article , PeerReviewed
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  • 6
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    American Institute of Physics
    In:  The Leading Edge, 14 (10). pp. 1053-1058.
    Publication Date: 2016-07-26
    Description: Seismic data are usually acquired and processed for imaging reflections. This paper describes a method of processing seismic data for imaging discontinuities (e.g., faults and stratigraphic features). One application of this nontraditional process is a 3-D volume, or cube, of coherence coefficients within which faults are revealed as numerically separated surfaces. Figure 1 compares a traditional 3-D reflection amplitude time slice with the results of the new method. To our knowledge, this is the first published method of revealing fault surfaces within a 3-D volume for which no fault reflections have been recorded.
    Type: Article , PeerReviewed
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  • 7
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    American Institute of Physics
    In:  The Leading Edge, 15 (10). p. 1090.
    Publication Date: 2016-08-30
    Description: Attributes have proliferated recently with different selections available on different workstations. What do they all mean? When do we use one and when another? The answers to these questions are not easy but the first step is to understand what our options are, and herein lies the purpose of this article.
    Type: Article , PeerReviewed
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  • 8
    Publication Date: 2019-01-02
    Description: High-resolution 3D (HR3D) seismic data are important for hydrocarbon exploration of shallow reservoirs, site characterization, and geohazard assessments. The goal of this contribution is to identify and quantify the parameters to increase the resolution of HR3D seismic data to meter scale. The main acquisition parameters controlling the resolution of the collected data are the spectrum of the seismic source, source-receiver offset range, and trace density. An evolution to one-meter-scale resolution of 3D seismic will rely on combining a reproducible seismic source with high frequencies up to at least 600 Hz, a high uniform trace density of more than 4 million traces per square kilometer, and an offset range shorter than approximately 200 m. The resulting 3D seismic data volume will reach meter-scale resolution for water and target depths of less than 600 m. The proposed HR3D system will be suitable for 3D and 4D characterization of seabed properties and shallow stratigraphy, the identification of geohazards and hydrocarbon leakage, and monitoring the environmental impact of offshore activities. The P-Cable 3D system is an excellent starting point for achieving one-meter-scale resolution due to its flexible and tight meter-scale shot and receiver spacing.
    Type: Article , PeerReviewed
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  • 9
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    American Institute of Physics
    In:  The Leading Edge, 26 (9). pp. 1186-1196.
    Publication Date: 2019-04-29
    Description: The seismic trace is a complex aggregate of reflected and scattered signals from subsurface formation interfaces and heterogeneities. Although many varieties of random noise may also be present in the trace, we know from reacquiring the same seismic survey that seismic data are highly repeatable, indicating that significant information about the subsurface is contained in the trace but not yet used by our standard analysis methods. Seismic scattering is a type of signal contained in the data that is generally not utilized.
    Type: Article , PeerReviewed
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  • 10
    Publication Date: 2016-05-24
    Description: Shallow gas occurs between 0 and 1000 m below the sea floor. It consists mainly of microbial-formed or thermogenic methane or a combination of both, sometimes with a limited admixture of higher hydrocarbons (propane, butane, etc.).
    Type: Article , PeerReviewed
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