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  • 1
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    Spatiotemporal variation of precipitation based on three indicators in the flood season in Beijing (2016)
    Institute of Physics (IOP)
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    Publication Date: 2016-09-03
    Description: This paper attempts to analyze the spatiotemporal variation of precipitation in Beijing in terms of three indicators, i.e., the total precipitation, the maximum daily precipitation, and the maximum 5h precipitation in the flood season, with data collected from 20 meteorological stations from 1975 to 2012 (June to September). The Mann-Kendall nonparametric test, the linear regression, and five-year moving average were used. The results showed that: (i) the three indicators showed a decreasing trend; however, from 1975 to 1995 and from 1995 to 2012, the precipitation in the flood season showed an increasing trend with an increasing rate of 3.36 and 2.90mm/a, respectively. (ii) The indicators demonstrated a similar spatial variation. The high value precipitation areas were mainly in the northern and central parts of the city. The central districts had increasing centers with maximum increasing rates of 0.35, 0.65, and 0.49mm/a, respectively. However, the northern part exhibited dif...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 2
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    Numerical analysis on mixing performance of logarithmic spiral impeller (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-07-31
    Description: Mixing performance of the solid-liquid two phase system in a mixing tank equipped with a logarithmic spiral impeller is studied with fluid dynamics software FLUENT. Based on the kinetic theory of granular flow, the basic control equations of the E-E model are established. A multiple reference frame (MRF) method and the RNG k - ε turbulence model are chosen to simulate solid-liquid flow performance and results are compared with that of the four blade turbine (MK) and the six blade turbine (PY). Research shows that the logarithmic helicoidal impeller improves solid-liquid axial-flow performance, and the concentration, power consumption and the mixing time of it are better compared with the PY and MK impellers. For a wide range of mixing velocities, the concentration of the sludge particles is always lower in the upper position to impeller than in the lower position. With the increase of velocity, the power consumption raises gradually, the uniformity of solid particle ...
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    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 3
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    Contributions of climate change and anthropogenic activities to runoff change in the Hongshui River, Southwest China (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: Changes in water resources are mainly affected by the combined effects of anthropogenic activities and climate change. The relative effects of anthropogenic activities and climate on a river basin are investigated to not only understand the hydrological response mechanism in a catchment but also manage local water resources and protect against floods and droughts. In this study, a variable infiltration capacity (VIC) model combined with a hydrologic sensitivity analysis was used to quantify the effects of anthropogenic activities and climate change on runoff in the upper reaches of the Hongshui River basin (UHRB). During 1970-2015, the runoff contribution for climate change and anthropogenic activities were 89.2% and 10.8%, respectively. This result suggests that climate is the major driver of runoff variation in the basin. However, during 1990-1999, anthropogenic activities played a decisive role in the reduction in streamflow, and the contribution percentage was 96.35%. Moreov...
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  • 4
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    Study on Deformation Penetration of Rolling Process by Rolling FEM Model of Wedged Ingot (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-08
    Description: In order to study the law of deformation penetration in thickness direction of the plate, 3D finite element model of wedged ingot rolling has been developed by means of software ABAQUS, in order to quantitative study the influence of reduction rate on the deformation penetration effect of steel plates, on the same reduction amount of whole wedged ingot and different reduction at different locations of the wedged ingot. Two pass rolling tests of small rolling mill on 120 mm thick wedged plate has been conducted. Finite element calculation and test results show that the center of plate almost no deformation when the reduction rate decreased to a certain extent ( 〈 15%) and the center of plate deformation rate increased significantly with the increase of the rate of pass reduction.
    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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    Rural sewage treatment processing in Yongjia County, Zhejiang Province (2016)
    Institute of Physics (IOP)
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    Publication Date: 2016-09-03
    Description: Issues regarding water pollution in rural areas of China have garnered increased attention over the years. Further discussion on the circumstances and results of existing domestic sewage treatment methods may serve as an appropriate reference in solving these important issues. This article explored the current conditions of water contamination in rural areas of China, introduced the characteristics and effects of applicable sewage treatment technology, and summarized the results of the planning, installation, and operation of rural sewage treatment facilities in Yongjia County in Zhejiang Province. However, relying on a single technical design rule is not adequate for solving the practical problems that these villages face. Instead, methods of planning rural sewage treatment should be adapted to better suit local conditions and different residential forms. It is crucial, ultimately, for any domestic sewage treatment system in a rural area to be commissioned, engineered, and main...
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  • 6
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    Production and properties of high strength Ni free Zr-based BMGs (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-06-18
    Description: Bulk metallic glasses (BMGs) are well known for very attractive physical, mechanical and thermal properties. Zr-based BMGs are used as structural materials in sports goods, electronics, jewelry, medical and aerospace applications. Ni free Zr 48 Cu 36 Al 8 M 8 (M = Nb, Ti and Ta) BMGs are successfully synthesized by Cu mold casting technique. Differential scanning calorimetery (DSC) results show that the Zr 48 Cu 36 Al 8 Nb 8 BMG have good thermal stability, wide supercooled liquid region of 80 K and contain the double stage crystallization. The alloy has fracture strength of 1.953 GPa. Shear angle was measured to be in the range of 43.5±5° for the alloy studied. Vicker's hardness of the BMGs was found to be over 500 Hv for the as cast alloy which enhanced about 11 % more by annealing up to 600 °C/20 min. Intersected shear bands were observed. The observed promising mechanical and thermal prope...
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 7
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    Synthesis and characterization of Mg-based amorphous alloys and their use for decolorization of Azo dyes (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-06-18
    Description: Mg-based alloys are light weight and have wide range of applications in the automotive industry. These alloys are widely used because of their very attractive physical and mechanical properties and corrosion resistance. The properties and applications can be further improved by changing the nature of materials from crystalline to amorphous. In this study, melt spun ribbons (MSRs) of Mg 70 Zn 25 Ca 5 Mg 68 Zn 27 Ca 5 alloys were prepared by melt spinning technique by using 3-4N pure metals. Characterization of the samples was done by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and energy dispersive x-ray analyzer (EDAX). Microstructural investigations were conducted by using scanning electron microscopy (SEM), atomic force microscopy (AFM) as well as optical and stereo scan microscopy techniques. DSC results showed multistage crystallization. Activation energy was found to be 225 kJ/mol by Kissinger meth...
    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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    Simulating-optimizing coupled method for pumping well layout at a nitrate-polluted groundwater site (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: The unreasonable pumping scheme of the pump-treat technology can lead to high repair cost and poor performance in contaminated groundwater remediation. In order to improve the cost effectiveness of the technology, we took a heavily nitrate-polluted informal domestic waste landfill site in North China as an example, and optimized the pumping scheme using Visual MODFlOW software combined with genetic algorithm (GA) in MGO module. By designing the constant pumping rate scheme and phased pumping rate scheme, optimal layout of pumping wells were determined with the minimum total pumping capacity as the optimal target. The result showed that the two wells which located near the central axis and in the middle and lower reaches of the plume with a constant pumping rate of 13.2 m 3 /d and continuous pumping for 75 days was the optimal pumping solution in constant pumping rate scheme. While the pump schedule as Q 1 = 19.8 m 3 /d, Q 2 =...
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 9
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    Design of on line detection system for static evaporation rate of LNG vehicle cylinders (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-06-13
    Description: In order to solve the problems existing in the regular inspection of LNG vehicle cylinders, the static evaporation rate on line detection system of LNG cylinders is discussed in this paper. A non-disassembling, short-term and high-efficiency on line detection system for LNG vehicle cylinders is proposed, which can meet the requirement of evaporation rate test under different media and different test pressures. And then test methods under the experimental conditions, atmospheric pressure and pressure are given respectively. This online detection system designed in this paper can effectively solve the technical problems during the inspection of the cylinder.
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    Topics: Geography , Geosciences , Physics
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  • 10
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    The Influence of Land Intensive Use and Urbanization to Air Pollution: Evidence from China (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-11-29
    Description: Urbanization has a significant impact on environmental pollution, but the relationship between urbanization and environmental pollution is complex. This paper separately discusses the population urbanization and land urbanization relationship of air pollution, and the impact of urbanization level and land intensive utilization on air pollution are used for empirical analysis. The panel data of 35 provincial capitals and sub provincial cities in China are selected from 2003 to 2015, and index system is constructed to evaluate the level of urbanization, land urbanization and land intensive use. After testing the Heteroscedasticity between panels, Autocorrelation within groups and contemporaneous correlation across panels of the panel data, an econometric model is established and a comprehensive feasible generalized least squares (FGLS) method is chosen to estimate the consistent and valid results which show the effects of urbanization, land urbanization and land intensive utilizat...
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    Topics: Geography , Geosciences , Physics
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