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  • 1
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    Table 2 Analytical data of the samples by the “Dipole CHIM” at the Yingezhuang gold deposit (2013)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Description: CHIM method involves extracting metal ions of electromobile forms in either anodes or cathodes, facilitated by a man-made electric field. This paper presents two newly developed CHIM alternatives that are electrified by a low voltage dipole. The firstly improved technique enables cationic ions to be extracted in a single cathode, whereas the secondly improved technique allows both anionic and cationic species to be extracted simultaneously in an anode and in a cathode. Compared with the traditional CHIM methods, the innovative techniques developed in this paper are characterized by simple instrumentation, low cost and easy operation in field, and in particular enables simultaneous extraction of anionic and cationic species of elements, from which more information can be derived with higher extraction efficiency. Field tests at several well-known mine areas in China confirm the effectiveness and efficiency of the new techniques in exploring for deeply buried ore bodies.
    Keywords: Antimony; Arsenic; China; Geological sample; GEOS; Gold; gold deposit; Sample ID; Silver; Yingezhuang
    Type: Dataset
    Format: text/tab-separated-values, 230 data points
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  • 2
    Electronic Resource
    Electronic Resource
    Amine-linked thioxanthones as water-compatible photoinitiators (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2563-2570 
    Details
    ISSN: 0887-624X
    Keywords: thioxanthone derivatives ; water-compatible photoinitiator ; absorption spectrum ; fluorescence ; photopolymerization ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Six amine-linked thioxanthones, i.e., 2-(2-hydroxy-3-[bis(2-hydroxyethyl)amino]propoxy)thioxanthone (HAPTX) and its 4-methyl, 1,3-dimethyl, 1,4-dimethyl, 3,4-dimethyl, and 1,3,4-trimethyl substituted derivatives, were synthesized as water-compatible photoinitiators and identified with FTIR, MS, NMR, and elementary analysis. The absorption and fluorescence properties were studied. Their photoinitiating polymerization efficiencies were tested with a recording dilatometer utilizing acrylamide as monomer in aqueous solution. The results show that the six amine-linked thioxanthones can independently initiate acrylamide polymerization efficiently without additional external amines as co-initiators. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2563-2570, 1998
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
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    Characterization and 2D structural model of corn straw and poplar leaf biochars (2017)
    Springer
    Details
    Publication Date: 2017-12-22
    Print ISSN: 0944-1344
    Electronic ISSN: 1614-7499
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 4
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    H2O adsorption on amorphous In-Ga-Zn-O thin-film transistors under negative bias stress (2017)
    American Institute of Physics
    Details
    Publication Date: 2017-08-14
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 5
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    Investigation of an anomalous hump phenomenon in via-type amorphous In-Ga-Zn-O thin-film transistors under positive bias temperature stress (2017)
    American Institute of Physics
    Details
    Publication Date: 2017-04-03
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics
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  • 6
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    Diffuse reflection inside a hexagonal nanocavity (2013)
    Springer Nature
    Details
    Publication Date: 2013-02-19
    Description: Geometrical diffuse reflection is a common optical phenomenon that occurs when a reflecting surface has roughness of order of hundreds of micrometres. Light rays thus reflect uniformly in all directions with each ray obeying Snell's law. Of interest is knowing what happens when light reflects off surfaces with roughness of nanometres. Here, by introducing nanoscaled roughness on the hexagonal faces of ZnO nanocavities, we observe luminescent profiles with flowery patterns, replacing the usual whispering gallery modes. The unique profile for these nanocavities is attributed to wave diffuse reflection, which occurs when the features on the reflecting surfaces are typically nanometre-sized. Light with wavelengths of similar scale “sees” these nano-perturbations, and undergoes scattering rather than geometrical diffuse reflection. These findings could benefit the fields of nanoscale topography and nanoscopic uniform lighting by using wave diffuse reflection. Scientific Reports 3 doi: 10.1038/srep01298
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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  • 7
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    Tectonic Deformation and Fluid Flow: Implications for the Formation of Unconformity-Related Uranium Deposits (2012)
    Society of Economic Geologists (SEG)
    Details
    Publication Date: 2012-01-01
    Description: Numerical experiments were carried out to investigate the fluid flow in typical Proterozoic basins that host unconformity-related uranium deposits. We have constructed a simplified conceptual model by integrating important features shared by the Athabasca, Thelon, and Kombolgie Basins. Based on this conceptual model, various numerical scenarios were designed to explore the interaction between fluid flow, heat transport, topographic relief, and tectonic deformation. Our modeling suggests that thermally driven free convection may develop in the thick sandstone sequence at a geothermal gradient of between 25° and 35°C/km during periods of tectonic quiescence, with a maximum velocity of about 1.0 m/yr. However, reactivation of preexisting basement structures and the generation of new faults suppressed free convection and led to deformation-dominated fluid flow or mixed convection, depending on strain rates. During compressive deformation, reduced brines in the basement may flow out along fractured zones and encounter uranium-bearing fluids in the clastic sequence to form sandstone-hosted deposits. In contrast, basement-hosted deposits are likely to form during extension, when oxidized basinal brines flow into faulted structures to interact with reduced minerals or fluids in the basement. Maximum flow rates are estimated to be up to ~7 and ~2.5 m/yr in the relatively high permeability fracture zone for compressive and extensional deformation, respectively, given a strain rate of 10-13 s-1 and a geothermal gradient of 30°C/km. In addition, the rate of pressure accumulation and dissipation is different in various geologic units depending on their hydrological properties and strain rates.
    Print ISSN: 0361-0128
    Topics: Geosciences
    Published by Society of Economic Geologists (SEG)
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  • 8
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    Materials, Vol. 11, Pages 944: Effect of Alpha-Particle Irradiation on InGaP/GaAs/Ge Triple-Junction Solar Cells (2018)
    MDPI Publishing
    In: Materials
    Details
    Publication Date: 2018-06-05
    Description: Materials, Vol. 11, Pages 944: Effect of Alpha-Particle Irradiation on InGaP/GaAs/Ge Triple-Junction Solar Cells Materials doi: 10.3390/ma11060944 Authors: Jing Xu Min Guo Ming Lu Hu He Guang Yang Jianwen Xu InGaP/GaAs/Ge triple-junction solar cells were irradiated with 5.1 MeV alpha particles with different fluences. The degradations of the optical and electrical properties of InGaP/GaAs/Ge solar cells were described in terms of the variation in the short-circuit current (Isc), the open-circuit voltage (Voc), the maximum power (Pmax), the spectral response (SR), and the photoluminescence (PL) versus the 5.1 MeV alpha-particle fluences. The degradation modeling of the Isc and Voc under 1 MeV, 3 MeV, and 5.1 MeV alpha-particle irradiation was performed by calculating the introduction rate of non-radiative recombination centers, and the minority-carrier capture cross section, and the results were in good agreement with experimental data. For comparison, the degradations of the Isc and Voc were presented under 1 MeV and 3 MeV proton irradiation.
    Electronic ISSN: 1996-1944
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by MDPI Publishing
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  • 9
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    Valley surface-wave photonic crystal and its bulk/edge transport (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-11-07
    Description: Author(s): Zhen Gao, Zhaoju Yang, Fei Gao, Haoran Xue, Yahui Yang, Jianwen Dong, and Baile Zhang The valley Hall effect and topological valley edge states are two fundamental properties in gapped valleytronic materials, such as MoS 2 and biased bilayer graphene. Such properties have paved the way for applications in valleytronics. Here, the authors experimentally demonstrate a valley surface-wave photonic crystal on a single metal surface, as the photonic analog of the valley-Hall topological insulator phase. The photonic valley-Hall effect with valley-chirality locked beam splitting, and topological valley-polarized edge states, are demonstrated for the first time on a photonic platform. [Phys. Rev. B 96, 201402(R)] Published Mon Nov 06, 2017
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 10
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    Solute transport across basement/cover interfaces by buoyancy-driven thermohaline convection: Implications for the formation of unconformity-related uranium deposits (2012)
    HighWire Press
    Details
    Publication Date: 2012-11-01
    Description: Previous studies have suggested that buoyancy-driven convection could only have developed in thick sandstone aquifers within Proterozoic intracratonic sedimentary basins that host unconformity-related uranium deposits. On the other hand, oxygen and hydrogen isotopic and fluid inclusion studies of quartz and carbonate veins have shown that basinal brines have interacted with basement rocks and basement-derived fluids pervasively. Finite element modeling was conducted to investigate the potential mechanisms driving fluid interaction across a basement/cover unconformity. We firstly constructed a simplified conceptual model by integrating the known features shared by the Athabasca, Thelon and Kombolgie basins and their Phanerozoic counterparts. Based on this conceptual model, various numerical scenarios were designed to examine buoyancy-driven (heat and solute transport are coupled) fluid flow patterns and the corresponding solute transport. The results show that thermohaline convection may have penetrated into the basement for up to 1 to 2 km below the unconformity, when typical hydrological parameters for these Proterozoic hydrogeological units were used. Fluid flow velocities in the sandstone sequence were several orders of magnitude larger than those in the basement. If a uranium source (a pore fluid with 500 mg/l uranium) was assumed to be located in the center of the basin below the unconformity, uranium was able to gradually spread into the sandstone aquifer through thermohaline convection without considering any contribution from fluid-rock interaction. The uranium concentration of basinal fluids above the uranium source approached 15 and 24 mg/l after 1 and 5 m.y. of modeling time, respectively. If the uranium source was initially located at the center of the aquifer, a uranium plume developed and percolated down to 2 km below the unconformity at 5 m.y. The location of the uranium source also affects the solute transport efficiency. A uranium source located around the sloping basal unconformity, either in the basin fill or basement, close to the basin margin, led to a wider uranium plume than if it was located near the center of the basin. Given appropriate hydrological conditions, thermohaline convection could have caused widespread interaction of basinal brines with basement rocks or basement-derived fluids in Proterozoic basins where unconformity-related uranium deposits have developed, and that enough uranium could have been leached from the uranium-rich basement to form large, high-grade unconformity-related uranium deposits.
    Print ISSN: 0002-9599
    Electronic ISSN: 1945-452X
    Topics: Geosciences
    Published by HighWire Press on behalf of The American Journal of Science.
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