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  • 1
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    Satellite measurements oversee China’s sulfur dioxide emission reductions from coal-fired power plants (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-11-10
    Description: To evaluate the real reductions in sulfur dioxide (SO 2 ) emissions from coal-fired power plants in China, Ozone Monitoring Instrument (OMI) remote sensing SO 2 columns were used to inversely model the SO 2 emission burdens surrounding 26 isolated power plants before and after the effective operation of their flue gas desulfurization (FGD) facilities. An improved two-dimensional Gaussian fitting method was developed to estimate SO 2 burdens under complex background conditions, by using the accurate local background columns and the customized fitting domains for each target source. The OMI-derived SO 2 burdens before effective FGD operation were correlated well with the bottom-up emission estimates ( R = 0.92), showing the reliability of the OMI-derived SO 2 burdens as a linear indicator of the associated source strength. OMI observations indicated that the average lag time period between installation and effective o...
    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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    Impact of aerosols on radiation during a heavy haze event in Beijing (2014)
    Institute of Physics (IOP)
    Details
    Publication Date: 2014-03-19
    Description: In order to understand the influence of anthropogenic aerosols on radiation in the urban boundary layer, we measured atmospheric aerosol mass concentrations (PM 10 and PM 2.5 ), integrated solar radiation, wind and temperature at different layers of a 325-m iron tower. A typical heavy haze process occurring during the period of October 2004 was analyzed. It is observed that the inversion layer and the weak wind was the most important factor causing the accumulation of pollutants. The results show that the PM 10 concentrations under polluted day conditions is about 84 times (537.1μgm −3 ) higher than those on clear weather conditions (6.4μgm −3 ). The difference in the solar radiation between 2m and 280m became smaller (93.07 Wm −2 to 16.07 Wm −2 ) when pollution turned heavy, while the attenuations rate changed large (16.76% to 20.96%)
    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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    A technigue exploitation about anti-slide tire polyploid on ice-snow road in winter (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-04-22
    Description: Present studies focus on improving anti-slide property of tyes on ice-snow road by changing material modification of tyre tread and designing groove. However, the basic reason causing starting slide, long braking distance, turning slide slip and so on of tyres used in winter is that tyre tread materials are unitary and homogenous rubber composite which can’t coordinate driving demands of tyres in winter under muti-work condition, and can’t exert their best property when starting, braking and sliding slip. In order to improve comprehensive anti-slide property of tyres, this paper discusses about changing structure, shape and distribution proportion among haploid materials of tyre tread rubber. Polyploid bubber tyre tread technique based on artificial neural network which is in favor of starting, braking and anti-slide slip is optimized and combined. Friction feature and anti-slide mechanism on ice-snow road of polyploid rubber tyre tread are studied using testing technique of low...
    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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    Upper ocean response to typhoon Megi (2010) (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-02-14
    Description: In this paper, the response of the upper ocean to typhoon Megi is analyzed and studied by using the sea surface temperature (SST), 500hPa height field and wind field of NCEP reanalysis data and Argo buoy data. The results show that sea surface temperature (SST) will decrease significantly after typhoon, and on the right side of typhoon path cooling is more obvious than the left; the temperature changes dramatically on the right side of Megi path, and correspondingly the depth variation in mixed layer is also intense, and the distance between buoy and the center of the typhoon will al so affect the severity of the temperature variavtion, the salinity may increase or decrease after typhoon, it depends on the evaporation and precipitation or other relevant factors in this area.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
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    Strategy research of harbin city green transport and sustainable development from low carbon ecological perspective (2017)
    Institute of Physics (IOP)
    Details
    Publication Date: 2017-04-22
    Description: With quick development of urbanization and mechanization, there exist some problems in the cities, such as traffic jam, traffic safety, and traffic pollution and so on. It is extremely urgent for the city to develop green transport, in order to relieve these problems and push forward low carbon ecological construction in Harbin. Strategy research of Harbin city green transport and sustainable development is done from the eight aspects of building public transport system of integration, bicycle, walking, and slow-moving system and so on based on analyzing demands of low carbon ecology on city green transport development, and Harbin traffic development state.
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 6
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    Rapid decline in carbon monoxide emissions and export from East Asia between years 2005 and 2016 (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-03-24
    Description: Measurements of Pollution in the Troposphere (MOPITT) satellite and ground-based carbon monoxide (CO) measurements both suggest a widespread downward trend in CO concentrations over East Asia during the period 2005–2016. This negative trend is inconsistent with global bottom-up inventories of CO emissions, which show a small increase or stable emissions in this region. We try to reconcile the observed CO trend with emission inventories using an atmospheric inversion of the MOPITT CO data that estimates emissions from primary sources, secondary production, and chemical sinks of CO. The atmospheric inversion indicates a ~ −2% yr −1 decrease in emissions from primary sources in East Asia from 2005–2016. The decreasing emissions are mainly caused by source reductions in China. The regional MEIC inventory for China is the only bottom up estimate consistent with the inversion-diagnosed decrease of CO emissions. According to the MEIC data, decreasing CO emissions from four ma...
    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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  • 7
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    Mechanical Properties Experimental Study of Engineering Vehicle Refurbished Tire (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-06-03
    Description: The vehicle refurbished tire test system was constructed, got load-deformation, load-stiffness, and load-compression ratio property laws of engineering vehicle refurbished tire under the working condition of static state and ground contact, and built radial direction loading deformation mathematics model of 26.5R25 engineering vehicle refurbished tire. The test results show that radial-direction and side-direction deformation value is a little less than that of the new tire. The radial-direction stiffness and compression ratio of engineering vehicle refurbished tire were greatly influenced by radial-direction load and air inflation pressure. When load was certain, radial-direction stiffness would increase with air inflation pressure increasing. When air inflation pressure was certain, compression ratio of engineering vehicle refurbished tire would enlarge with radial-direction load increasing, which was a little less than that of the new and the same type tire. Aging degree of o...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 8
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    Loading Deformation Characteristic Simulation Study of Engineering Vehicle Refurbished Tire (2018)
    Institute of Physics (IOP)
    Details
    Publication Date: 2018-06-03
    Description: The paper constructed engineering vehicle refurbished tire computer geometry model, mechanics model, contact model, finite element analysis model, did simulation study on load-deformation property of engineering vehicle refurbished tire by comparing with that of the new and the same type tire, got load-deformation of engineering vehicle refurbished tire under the working condition of static state and ground contact. The analysis result shows that change rules of radial-direction deformation and side-direction deformation of engineering vehicle refurbished tire are close to that of the new tire, radial-direction and side-direction deformation value is a little less than that of the new tire. When air inflation pressure was certain, radial-direction deformation linear rule of engineer vehicle refurbished tire would increase with load adding, however, side-direction deformation showed linear change rule, when air inflation pressure was low; and it would show increase of non-linear ...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
    Published by Institute of Physics (IOP)
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  • 9
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    Influence of thermal and resonance neutron on fast neutron flux measurement by 239 Pu fission chamber (2015)
    Institute of Physics (IOP)
    Details
    Publication Date: 2015-01-15
    Description: The 239 Pu fission chambers are widely used to measure fission spectrum neutron flux due to a flat response to fast neutrons. However, in the meantime the resonance and thermal neutrons can cause a significant influence on the measurement if they are moderated, which could be eliminated by using 10 B and Cd covers. At a column enriched uranium fast neutron critical assembly, the fission reaction rates of 239 Pu are measured as 1.791×10 −16 , 2.350×10 −16 and 1.385×10 −15 per second for 15 mm thick 10 B cover, 0.5 mm thick Cd cover, and no cover respectively, while the fission reaction rate of 239 Pu is rapidly increased to 2.569×10 −14 for a 20 mm thick polythene covering fission chamber. The average 239 Pu fission cross-section of thermal and resonance neutrons is calculated to be 500 b and 24.95 b with the assumption of 1/ v and 1/ E spectra respectively, then thermal...
    Print ISSN: 1674-1137
    Topics: Physics
    Published by Institute of Physics (IOP)
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