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  • 11
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    Land use/cover change and ITS eco-environment effect in Shiyang River Basin (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-11-06
    Description: Based on the origin data of Landsat TM images in 1980, 1995, 2000, 2006, 2012, this paper recurred to geoscience information spectrogram theory and utlized RS / GIS technologies, land use dynamic degree, land use transition matrixes and CA-Markov model to analyze the land use pattern change in Shiyang River Basin in the past 33 years, which was for the sake of discussing the spatial-temporal evolution rules and driving mechanism of land use in Shiyang River Basin. The results showed that: (1) There were apparent changes in the land use of Shiyang River Basin form 1980 to 2013. (2) in the past 33 years, the dynamic degrees of forest land, urban and rural resident construction land had relative large increase degree on the whole. (3) The main transition direction of land use types were arable land to grass land, grass land to unused land and unused land to arable land and forest land. (4) The CA-Markov model forecasting results indicated that there was no obvious change in land us...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 12
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    The tendency of linuron in microcosmic system and its response to hydrodynamic conditions (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: The environmental fate and bioaccumulation of linuron in a laboratory microcosm were investigated at three flow velocity over a period of 10 days. Linuron concentrations were quantified in the environmental media water, sediment, algae and fish after 1, 2, 4, 7 and 10 days of exposure. The results showed that rapid decrease in water phase of the microcosm was occurred, linuron had decreased to 56.7%-67.9% of the initial concentrations on day 10, and reduction rates showed an obvious increase with increased flow velocity. The linuron concentrations in the sediment were 1.25-2.13 ng/g on day 10, which were much less than that in algae (387-477 ng/g). The linuron was widely detected in fish tissues, and the bioaccumulation concentrations were generally in the following order: liver 〉 kidney 〉 brain 〉 skin 〉 muscle 〉 gill at an early stage of exposure. However, the ability of liver detoxification increased with the exposure time and exposure flow velocity, so that the...
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    Topics: Geography , Geosciences , Physics
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  • 13
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    The contrastive study of Mn-Ce/clay and Mn-Ce/TiO 2 catalysts in denitration performance (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-08
    Description: The strip-like Mn-Ce/clay and Mn-Ce/TiO 2 catalysts, which used MnOx and CeOx as active components, clay and TiO 2 as supports respectively, were prepared by impregnation method. The as-prepared catalysts were systematically characterized by XRF, BET, XRD, NH 3 -TPD and in situ DRIFTS respectively. Meanwhile, their denitration performance was also studied. The experimental results presented that Mn-Ce/clay and Mn-Ce/TiO 2 had little difference in denitration performance, which can be attributed to the amorphous status of their active components. When the loading amount of Mn-Ce was 30%, the as-prepared catalyst showed the highest activity at 150~200°C, and the denitration rate was over 90%.
    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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  • 14
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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)
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    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...
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    Topics: Geography , Geosciences , Physics
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  • 15
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    Research on the response of the water sources to the climatic change in Shiyang River Basin (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-09-01
    Description: The influence of the future climate change to the water resource will directly pose some impact on the watershed management planning and administrative strategies of Shiyang River Basin. With the purpose of exploring the influence of climate change to the runoff, this paper set Shiyang River as the study area and then established a SWAT basin hydrological model based on the data such as DEM, land use, soil, climate hydrology and so on. Besides, algorithm of SUFI2 embedded in SWAT-CUP software is adopted. The conclusion shows that SWAT Model can simulate the runoff process of Nanying River well. During the period of model verification and simulation, the runoff Nash-Sutcliffe efficient coefficient of the verification and simulation is 0.76 and 0.72 separately. The relative error between the simulation and actual measurement and the model efficient coefficient are both within the scope of acceptance, which means that the SWAT hydrological model can be properly applied into the run...
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    Topics: Geography , Geosciences , Physics
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  • 16
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    Dissolution behaviour of polyethersulfone in diglycidyl ether of bisphenol-A epoxy resins (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-07-07
    Description: Polyethersulfone (PES) is considered as an important and useful toughener for epoxy resins (EPs). Generally, PES was first dissolved in EP oligomer to form a homogeneous solution, which considerably affected the properties of cured EPs. Turbidity measurement was carried out to characterize the dissolution behaviour. Different PES/EP systems exhibited the same dissolution behaviour, albeit different swelling rate ( R S ) and dissolution rate ( R D ). Compared to molecular weight, the particle size and hydroxyl content of PES exerted considerable effects on dissolution. The smaller epoxy equivalent these diglycidyl ether of bisphenol-A (DGEBA) oligomers possessed, the better dissolubility they had; the more small molecules they contained, the more apparent the swelling observed. Moisture prevented the diffusion of the DGEBA oligomer molecules into PES. With increasing temperature, R S and R D first rapidly increas...
    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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  • 17
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    The synthesis of ZSM-5 using natural clay of Qinghai Salt Lake and its Pb(II) adsorption (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-08-06
    Description: ZSM-5 zeolite was successfully prepared through hydrothermal synthesis, for the first time, using natural clay collected from the potash ore deposit of a Salt Lake in Qaidam Basin, China. The resultant product was characterized by a series of technologies. The adsorption capacity of the final product for removing Pb (II) in aqueous solution was also investigated. The adsorption processes can be well described by the pseudo-second-order rate equation and classical Langmuir model. Results suggested that Salt Lake clay is a promising low-cost precursor for the industrial production of microporous aluminosilicate, and the ZSM-5 zeolite exhibited a potential application in Pb(II) pollution cleanup.
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 18
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    Influencing Factors on Shear Strength of Asphalt Mortar with High Viscosity (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-17
    Description: In order to study the influencing factors on the shear strength of asphalt mortar with high viscosity, many different compositions are considered to analyse the shear strength of asphalt mortar, such as asphalt from different resource, mineral powder, wimble weight, temperature and ratio of filler to bitumen. The results indicate that among these factors, the influence of wimble strength is the smallest, which can be ignored. The shear strength of asphalt mortar decreases with increasing temperature from 25°C∼50°C. Meanwhile it changes with the ratio of filler to bitumen by 1.2 under the temperature changing from 25°C∼35°C. Also with the rising ratio between filler and bitumen, the sheer strength of mortar increases. However, the temperature sensitivity changes differently with its peak. Compared to the type of mineral powder, the influence of asphalt resource on shear strength and temperature sensitivity are more significant.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 19
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    Rheological Properties of Asphalt Mortar with High Viscosity (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-05-17
    Description: In order to study the rheological and rotary viscosity characteristics of asphalt mortar with high viscosity containing different asphalt and filler, the component, filler-bitumen ratio and temperature are considered. The results show that among these factors, viscosity and specific surface area are the main factors that influence the ability of resistance to high temperature deformation. The temperature sensitivity and G*/sinδ increase with increasing filler-bitumen ratio.The growth rate changes corresponding to the filler-bitumen ratio of 1.2. A good exponential relationship exists between G*/sinδ and Brookfield rotary viscosity at 135°C and 150°C. Thus, the results of Brookfield rotary viscosity can be used to estimate the influence of filler-bitumen ratio to asphalt mortar characteristics at high temperature instead of filler-bitumen ratio to asphalt mortar characteristics at high temperature instead of G*/sinδ.
    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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  • 20
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    Research on Modeling Technology of Virtual Robot Based on LabVIEW (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-12-22
    Description: Because of the dangerous working environment, the underwater operation robot for nuclear power station needs manual teleoperation. In the process of operation, it is necessary to guide the position and orientation of the robot in real time. In this paper, the geometric modeling of the virtual robot and the working environment is accomplished by using SolidWorks software, and the accurate modeling and assembly of the robot are realized. Using LabVIEW software to read the model, and established the manipulator forward kinematics and inverse kinematics model, and realized the hierarchical modeling of virtual robot and computer graphics modeling. Experimental results show that the method studied in this paper can be successfully applied to robot control system.
    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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