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  • 1
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    Coseismic Surface Ruptures Associated with the 2014 Mw 6.9 Yutian Earthquake on the Altyn Tagh Fault, Tibetan Plateau (2016)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2016-04-07
    Description: Field investigations reveal that the 2014 M w  6.9 Yutian earthquake on the left-lateral strike-slip Altyn Tagh fault (ATF) system, Tibetan Plateau, produced an ~25-km-long surface rupture zone that contains conjugate Riedel shear faults. The coseismic surface ruptures occurred mainly along two parallel east-northeast-trending active left-lateral strike-slip faults. Rupture also occurred in a conjugate, west-northwest-trending zone along an active right-lateral strike-slip fault. The east-northeast-trending ruptures are concentrated in a zone of 〈500-m wide and ~25-km long, and are characterized by Riedel shear structures including distinct shear faults (Y) with a maximum sinistral displacement of ~1 m, right-stepping en echelon cracks, and mole tracks. In contrast, the west-northwest-trending ruptures occur within a zone of up to 1.5-km wide and ~4-km long in the jog area between the two parallel east-northeast-trending faults, and this zone is characterized by discontinuous shear faults with dextral displacements of 〈0.5 m, left-stepping en echelon cracks, and mole tracks, all oriented oblique to the east-northeast-trending rupture zones at an angle of 30°–40°. The lengths and displacements of the coseismic surface ruptures measured in the field are comparable with those obtained from the empirical relationships between magnitude and coseismic surface rupture length and displacement. Our findings demonstrate that the coseismic conjugate Riedel faulting was controlled mainly by preexisting active faults of the ATF system, reflecting the present-day tectonic stress field associated with the ongoing penetration of the Indian Plate into the Eurasian Plate.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 2
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    Sensitive 3-omega measurements on epitaxial thermoelectric thin films (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-11-29
    Description: Here we present a work on the development of a sensitive 3-omega instrumentation adapted for the measurement of the thermal conductivity of epitaxial thin films. The experimental setup has been validated by the measurements on an epitaxial germanium nanostructured thin film. This manganese doped germanium matrix contains Ge 3 Mn 5 nanoinclusions having a diameter of 5 to 50 nm, grown by Molecular Beam Epitaxy (MBE). The 3 omega measurements have revealed that the thermal conductivity of GeMn nanostructured thin films can be decreased by a factor of ten as compared to the bulk value.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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  • 3
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    The mitigation effect of configuration and context optimization of urban holdings on heat island (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-03-19
    Description: The urban heat island (UHI) phenomenon has become a serious problem in recent years. It is necessary to study the mitigation methods and quantify their effects on UHI. In this paper, based on the remote sensed data, an empirical model was established as a negative function of land surface temperature (LST) to vegetation coverage. Urban heat island intensity (UHII) was estimated by a robust statistic algorithm. Compared with the current condition (vegetation coverage equaling to 0%), five high vegetation coverage building scenarios (10%, 20%, 30%, 40%, and 50%) were designed to explore mitigation effects on UHI separately. The results showed that the mean LST increase by about 0.5°C when vegetation coverage decrease by 0.1. UHII has a considerable decrease when the scenarios of vegetation coverage equaling to 20% and 40%, respectively. The reasonable vegetation configuration is the effective UHI mitigation.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 4
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    Experiments on Seepage Flow Patterns in Fine Controlled Fractured Thin and Poor Reservoir (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-10-12
    Description: Experiments on seepage flow patterns in fine controlled fractured thin and poor reservoir were carried out based on artificial core plate models. Pressure gradient distribution is revealed based on pressure data obtained by pressure transducers in artificial core plate models, and sketch maps of seepage flow sections are drawn to study on seepage flow patterns qualitatively and quantitatively. Experiments show that seepage flow patterns in thin and poor reservoir are influenced by permeability, heterogeneity and cracks of fine controlled fracturing, horizontal cracks generated by fine controlled fracturing have greater influence on seepage flow patterns as thin and poor reservoirs have strong homogeneity and low permeability. Fine controlled fracturing can reduce the negative influence of low permeability and strong heterogeneity and expand fluid flow range. Thin and poor reservoirs can be divided into three sections by types of seepage flow for fluid flowing through, i.e. the n...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 5
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    Coseismic Surface Ruptures Associated with the 2014 Mw 6.9 Yutian Earthquake on the Altyn Tagh Fault, Tibetan Plateau [Article] (2016)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2016-04-15
    Description: Field investigations reveal that the 2014 M w  6.9 Yutian earthquake on the left-lateral strike-slip Altyn Tagh fault (ATF) system, Tibetan Plateau, produced an ~25-km-long surface rupture zone that contains conjugate Riedel shear faults. The coseismic surface ruptures occurred mainly along two parallel east-northeast-trending active left-lateral strike-slip faults. Rupture also occurred in a conjugate, west-northwest-trending zone along an active right-lateral strike-slip fault. The east-northeast-trending ruptures are concentrated in a zone of 〈500-m wide and ~25-km long, and are characterized by Riedel shear structures including distinct shear faults (Y) with a maximum sinistral displacement of ~1 m, right-stepping en echelon cracks, and mole tracks. In contrast, the west-northwest-trending ruptures occur within a zone of up to 1.5-km wide and ~4-km long in the jog area between the two parallel east-northeast-trending faults, and this zone is characterized by discontinuous shear faults with dextral displacements of 〈0.5 m, left-stepping en echelon cracks, and mole tracks, all oriented oblique to the east-northeast-trending rupture zones at an angle of 30°–40°. The lengths and displacements of the coseismic surface ruptures measured in the field are comparable with those obtained from the empirical relationships between magnitude and coseismic surface rupture length and displacement. Our findings demonstrate that the coseismic conjugate Riedel faulting was controlled mainly by preexisting active faults of the ATF system, reflecting the present-day tectonic stress field associated with the ongoing penetration of the Indian Plate into the Eurasian Plate.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 6
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    Real-time simulation of large-scale floods (2016)
    Institute of Physics (IOP)
    Details
    Publication Date: 2016-09-03
    Description: According to the complex real-time water situation, the real-time simulation of large-scale floods is very important for flood prevention practice. Model robustness and running efficiency are two critical factors in successful real-time flood simulation. This paper proposed a robust, two-dimensional, shallow water model based on the unstructured Godunov- type finite volume method. A robust wet/dry front method is used to enhance the numerical stability. An adaptive method is proposed to improve the running efficiency. The proposed model is used for large-scale flood simulation on real topography. Results compared to those of MIKE21 show the strong performance of the proposed model.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 7
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    Water quality and emergy evaluation of two freshwater aquacultural systems for eutrophic water in the Controlling by Biological Chains (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-09-01
    Description: According to the ecological restoration theory, this experiment establishes aquaculture systems controlled by biological chains in both Xiaoxidian area and Dujiadian area of Baiyangdian Lake separately in order to improve the environment and bring economic benefits. The appearance of Emergy Theory provides a new method for the quantitative analysis of ecological economic system. Based on the analysis of Emergy Theory, this thesis compares the eco-economic systems under different polyculture models between Xiaoxidian area and Dujiadian area. The result demonstrates that Xiaoxidian ecological system is of high Emergy Transformity with higher emergy output and economic income per unit area compared with Dujiadian area. While Dujiadian area has higher Emergy Yield Rate and lower Environment Load Rate. So Dujiadian area is more sustainable due to the overload non-renewable energy of Xiaoxidian area devoted by human. Therefore, it will be better if we adjust and optimize the managemen...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 8
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    Production of negatively charged radioactive ion beams (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-08-26
    Description: Beams of short-lived radioactive nuclei are needed for frontier experimental research in nuclear structure, reactions, and astrophysics. Negatively charged radioactive ion beams have unique advantages and allow for the use of a tandem accelerator for post-acceleration, which can provide the highest beam quality and continuously variable energies. Negative ion beams can be obtained with high intensity and some unique beam purification techniques based on differences in electronegativity and chemical reactivity can be used to provide beams with high purity. This article describes the production of negative radioactive ion beams at the former holifield radioactive ion beam facility at Oak Ridge National Laboratory and at the CERN ISOLDE facility with emphasis on the development of the negative ion sources employed at these two facilities.
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 9
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    Influence of temperature on Cole-Cole dielectric model of oil-immersed bushing (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-07-22
    Description: In this paper, 72.5 kV oil-immersed bushing was produced in laboratory. The frequency-domain dielectric response tests of oil-immersed bushings were carried out at different test temperatures. The experimental data were fitted by using the modified double relaxation Cole-Cole dielectric model. The influence of temperature variation on the dielectric response test of the oil-immersed bushing and the Cole-Cole dielectric model parameters were analysed. The results showed that with the increase of the test temperature, the spectrum of the real and imaginary of the complex permittivity are shifted to the high frequency direction; the parameters of the dielectric model are significantly affected by temperature.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 10
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    Co-simulation on vibration characteristics of uniaxial shaker based on AMESim and ADAMS (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-07-22
    Description: In this paper, we propose a selection method of the increased amplitude stability parameter for the unstable motion problem of the uniaxial shaker before its stable operation. On the basis of single-axis shaker dynamics equations, an ADMAS and AMESim combined simulation model is established. According to this model, the vibration characteristics under different parameters are solved by using the control variate method. The simulation results show that the motor speed, the eccentric mass and the inclination of screen surface are the three main factors which affect work starting state of uniaxial shaker. The working efficiency of uniaxial shaker is controlled by the motor speed while the amplitude is affected by the eccentric mass. Moreover, the inclination of screen surface plays a decisive role in the distribution of the vibration track before uniaxial shaker reaching the stable operation state. The relatively stable movement is obtained by optimizing the parameters, which provi...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Institute of Physics (IOP)
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