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  • 1
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    Did the widespread haze pollution over China increase during the last decade? A satellite view from space (2016)
    Institute of Physics (IOP)
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    Publication Date: 2016-05-27
    Description: Widespread haze layers usually cover China like low clouds, exerting marked influence on air quality and regional climate. With recent Collection 6 MODIS Deep Blue aerosol data in 2000–2015, we analyzed the trends of regional haze pollution and the corresponding influence of atmospheric circulation in China. Satellite observations show that regional haze pollution is mainly concentrated in northern and central China. The annual frequency of regional haze in northern China nearly doubles between 2000 and 2006, increasing from 30–50 to 80–90 days. Though there is a marked decrease in annual frequency during 2007–2009 due to both reduction of anthropogenic emissions and changes of meteorological conditions, regional pollution increases slowly but steadily after 2009, and maintains at a high level of 70–90 days except for the sudden decrease in 2015. Generally, there is a large increase in the number of regional-scale haze events during the last decade. Seasonal frequency of regiona...
    Print ISSN: 1748-9318
    Electronic ISSN: 1748-9326
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering
    Published by Institute of Physics (IOP)
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  • 2
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    Aerial visible-thermal infrared hyperspectral feature extraction technology and its application to object identification (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-03-19
    Description: Based on aerial visible-thermal infrared hyperspectral imaging system (CASI/SASI/TASI) data, field spectrometer data and multi-source geological information, this paper utilizes the hyperspectral data processing and feature extraction technology to identify uranium mineralization factors, the spectral features of typical tetravalent, hexavalent uranium minerals and mineralization factors are established, and hyperspectral logging technology for drill cores and trench also are developed, the relationships between radioactive intensity and spectral characteristics are built. Above methods have been applied to characterize uranium mineralization setting of granite-type and sandstone-type uranium deposits in south and northwest China, the successful outcomes of uranium prospecting have been achieved.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 3
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    Effect of Long-term Aging on Microstructure and Mechanical Properties of 2205 Duplex Stainless Steel at 500°C (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-12-13
    Description: The microstructure and mechanical properties of 2205 duplex stainless steel (DSS) during long-term aging at 500°C were studied. The results showed the hardness of specimens increased all the time during aging, reach the peak with aged for 5800h. Besides, aging at 500°C led to a significant decrease in toughness and notable increase in strength. Fractographs showed that, with increasing aging time, the fracture morphology changed from fibrous fracture to Tran’s granular and intragranular fracture. Finally, the changes in microstructure due to aging were studied by optical microscope, scanning electron microscopy and transmission electron microscopy. Transmission electron micrographs revealed that many dislocations and precipitates were distributed along α/γ and α/α interfaces. The precipitates were extracted and confirmed by diffraction pattern to be Cr2N and R-phase; they precipitate from the ferrite phase. Therefore, it can be concluded that dislocation, Cr2N and R-phase are th...
    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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  • 4
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    Analysis of Errors in Subway Team Cooperation based on Complex Network (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-08-04
    Description: Multi-team collaboration plays an important role in subway safe operation. In order to avoid the delay and inefficiency of emergency response caused by multi-team’ errors, this paper built the complex network of subway multi-team’s human factors. The complex network is constructed through thirteen types of subway emergency response. The status of events and equipment represents the node and the behavior of multi-team represents the edge in the complex network. The weight of edge ensured by the probability of a person’s failure that be calculated though the VACP model. At last, the importance of node and edge in complex network of multi-team is evaluated based on the complex network theory. So the importance of events and equipment status and team’s behavior in complex networks of multi-team are evaluated and sorted. The analysis results show that the screen, telephones and broadcasts are important equipment and “contacting by phone”, “seeing the screen” and “adjusting the train”...
    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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  • 5
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    Study on flow-induced crystallization behaviour of s-PVA/SWNTs dispersion (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-09-01
    Description: In this paper, crystallization behaviour of syndiotactic poly (vinyl alcohol) (s-PVA)/single-walled carbon nanotubes (SWNTs) under shear flow was studied. The flow-induced crystallization was carried out in test tubes by stirring the uniform s-PVA/SWNTs composite dispersions at high stirring speed, during which the crystalline precipitates were gradually formed as shear time goes on. The effect of flow resistance of tube walls ascribed to the tube types and the amount of SWCNTs on the crystallization, and the thermal properties and crystallinity of the precipitates were investigated. Results showed that plastic tube is easier to cause precipitates than glass tube; the amount of SWNTs has a great effect on the crystallization behaviour.
    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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  • 6
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    Indirect magnetic interaction mediated by Fermi arc and boundary reflection near Weyl semimetal surface (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-11
    Description: We theoretically investigate the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction between magnetic impurities distributed in the vicinity of the surface of a Weyl semimetal. Contrary to previous studies, we further take into account the influence of interplay of the Fermi arc and bulk states, and interface refection. It is shown that the RKKY pattern is significantly mediated by the Fermi-arc surface state along with the interface reflection. The Fermi-arc surface state mediates the RKKY interaction by interfering with the bulk states. The resulting interference contribution in the short-range impurity distance R is comparable in magnitude to the bulk-band contribution and even dominates the latter near the surface. It either enhances or weakens the bulk contribution, depending on the relative orientation of impurities and Fermi energy. More importantly, for the long-range impurity distance the interference term dominates in that it can prolong the decay rate from the ori...
    Electronic ISSN: 1367-2630
    Topics: Physics
    Published by Institute of Physics (IOP)
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  • 7
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    Parametric Modeling and Contact Analysis of Skew Spiral Bevel Gears (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: According to the principle of spherical involute generation, the mathematical model of skew spiral bevel gear tooth flank is derived, according to the mathematical model of the tooth flank, a solid model of the bevel gear is constructed, and then the meshing equation is derived by regulation that the relative motion velocity vector is perpendicular to the common normal line at the meshing point for a pair of gears. Finally, the contact line of skew spiral bevel gears meshing is analyzed, and the relative relationship between the meshing contact line and the tooth flank generation line are derived to provide a theoretical model for design, machining and assembly of gear.
    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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  • 8
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    Fractional Control of An Active Four-wheel-steering Vehicle (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-03-30
    Description: A four-wheel-steering (4WS) vehicle model and reference model with a drop filter are constructed. The decoupling of 4WS vehicle model is carried out. And a fractional PI λ D μ controller is introduced into the decoupling strategy to reduce the effects of the uncertainty of the vehicle parameters as well as the unmodelled dynamics on the system performance. Based on optimization techniques, the design of fractional controller are obtained to ensure the robustness of 4WS vehicle during the special range of frequencies through proper choice of the constraints. In order to compare with fractional robust controller, an optimal controller for the same vehicle is also designed. The simulations of the two control systems are carried out and it reveals that the decoupling and fractional robust controller is able to make vehicle model trace the reference model very well with better robustness.
    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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  • 9
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    Comprehensive vulnerability assessment method for nodes considering anti-interference ability and influence (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-04-05
    Description: The vulnerability assessment of power grid is of great significance in the current research. Power system faces many kinds of uncertainty factors, and the disturbance caused by them has become one of the main factors which restrict the safe operation of power grid. To solve this problem, considering the anti-interference ability of the system when the system is disturbed and the effect of the system when the node is out of operation, a set of index to reflect the anti-interference ability and the influence of nodes are set up. On this basis, a new comprehensive vulnerability assessment method of nodes is put forward by using super efficiency data envelopment analysis to scientific integration. Finally, the simulative results of IEEE30-bus system indicated that the proposed model is rational and valid.
    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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    The research and application of movable gel flooding technology in horizontal well pattern of Lu 36 block (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-06-03
    Description: Lu 36 block in Huabei oilfield uses vertical well to inject and horizontal well to produce. The reservoir heterogeneity of this block is strong and watercut is rising fast. The drilling in reservoirs of horizontal well pattern is long, so it is difficult to find water and shut off water, increasing the difficulty to adjust and develop. To explore an effective way to develop the remaining oil of the horizontal well reservoir in later stage of production. Through analyzing, the movable gel flooding can effectively improve interlayer contradictions, expand swept volume in the plane and innerlayer in Lu 36 block. The gel adaptable in horizontal well pattern is large doses, moderate strength and strong stability. Injecting on the single well can lead to the channeling or streaming. Through detailed reservoir description, the reserves are recalculated. The displacement system and parameters are further optimized. 4 wells in Lu 36 block has carried out the overall displacement. 51,264 ...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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