Yu L.,Harbin Institute of Technology |
Kang J.,University of Sheffield |
Hong L.,Shenzhen Environmental Monitoring Center |
Xie C.,Harbin Institute of Technology
INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control | Year: 2014
Living in modern cities is being interfered by ambitious noise more and more seriously. Present controlling approach is to monitor sound pressure level, which only describes one characteristic of a sound environment and ignores its influence on people too. Many studies proved that noise annoyance is not only determined by sound pressure level but also by soundscape that a person identifies. Since a bird singing or water babbling is perceived quieter than a traffic roaring even both having the same sound pressure level, it is considered that soundscape identification plays an important role in subjective evaluation of noise annoyance. Therefore, this study is going to explore how soundscape identification in determining noise annoyance evaluation within a city context. The study investigates four places in an ecological residential area that contains completely nature, nature mixed with man-made, and complete man-made soundscapes. Using recordings of the four study-sites, physical characteristics of a diversity soundscape have been analyzed and relationships of a soundscape's physical characteristics with noise annoyance evaluation have been studied.
Jiang B.,Shenzhen Environmental Monitoring Center |
Pang H.,Chinese Academy of Sciences |
Pang H.,Guangzhou GIC Green Building Materials Academy
Journal of Polymer Science, Part A: Polymer Chemistry | Year: 2016
Thermo-responsive block-graft fluoropolymer is synthesized and investigated the self-assembly morphology and the tunable wettability surface on cotton fabric by dip-coating into the micelles with different temperatures. Well-defined block-graft copolymer is prepared by click chemistry with poly(hexafluorobutyl methacrylate)-block-poly(glycidyl methacrylate) (PHFBMA-b-PGMA) and homopolymer poly(N-isopropylacrylate) with alkyne on main chain (Alkynyl-PNIPAM) to synthesize final block-graft polymer PHFBMA-b-(PGMA-g-PNIPAM). The thermo-responsive behaviors of block-graft polymer prove that the diameter for fluoropolymer micelle is about 50-70 nm with uniform sphere shape at room temperature and bigger and broader at 40 °C. The surface of cotton fabric processed in micelle solution at room temperature is smooth and has good hydrophobic property, while it has the hydrophilic property dipped in high temperature micelle solution. This work may give valuable guidance for fabricating a facile strategy to establish controllable wettability surfaces on different substrates, which is a promising candidate for the coating materials and industrial fields. © 2015 Wiley Periodicals, Inc.
Quantifying spatial-temporal pattern of urban heat Island in Beijing: An improved assessment using land surface temperture time series observations from landsat, modis and Chinese new satellite GaoFen-1
Liu K.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research |
Su H.,Florida Atlantic University |
Li X.,University of Connecticut |
Wang W.,Shenzhen Environmental Monitoring Center
ACRS 2015 - 36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, Proceedings | Year: 2015
The purpose of this study is to comprehensively quantify the spatial-temporal patterns of surface urban heat island (SUHI) by investigating the relationship between Land surface temperature (LST) and the land-cover types and associated landscape components in the case of Beijing, China. The Spatial and Temporal Adaptive Fusion Model (STARFM) developed by Gao et al. was employed to create the high spatial resolution LST time series, using LST data from the MODIS/Terra and LANDSAT 8 over the period from May to November in 2013. This paper also investigated the application of the Chinese new high spatial resolution satellite GaoFen-1 in urban thermal environments studies which were insufficiently studied previously. The impacts of four Landscape Metrics (LSMs) on urban LST were investigated on the basis of two scenes of GaoFen images acquired in 2013 summer (June 19 and August 10). Results showed that SUHI effect was prevalent in Beijing from May to October. The intensity of SUHI magnitude was found accentuated mainly in the summer months (July and August), indicating the trend of surface UHI effect is inconsistent with that of canopy-layer UHI effect. No obvious linear relationships were observed between mean subplot LST and impervious surfaces LSMs. However, four impervious surfaces LSMs were correlated well with the temporal dynamics of LST. We also found the configurational patterns of green space could put substantial influences as strong as corresponding compositional patterns and the lower vegetation coverage in downtown could better account for the urban LST.
Zhang H.,Shenzhen University |
Zhao L.,Shenzhen University |
He L.,Shenzhen Environmental Monitoring Center |
Chai Z.-F.,CAS Institute of High Energy Physics |
Yang B.,Shenzhen University
Huanjing Kexue/Environmental Science | Year: 2014
In order to explore the effect of regional functions on the pollution fingerprints and levels of perfluorinated compounds (PFCs), principal components analysis was combined with high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) and solid phase extraction enrichment in this research to analyze the levels of 14 PFCs species in 76 surface soil samples, which were collected from 4 functional regions, namely parks, communities, crossroads and surroundings of factories, as well as the urban background of Shenzhen. The results showed that regional functions had significant effect on total PFCs (∑PFCs), which ranked as the following: surroundings of factories(P<0.001) ≫crossroads(P<0.01)≫communities(P<0.05) ≫parks>urban background. The distribution of PFCs was in the order of medium-(P<0.05)≫long->short-chain PFCs in surroundings of factories, communities and crossroads, while in the order of medium-≈ short-(P<0.05)≫long chain PFCs in crossroads. Over 81% of ∑PFCs in the surface soil of Shenzhen could be attributed to the three principal components, represented by perfluorooctane sulfonate, perfluorooctane acid and perfluorotridecanoic acid, respectively. PFCs fingerprints were clearly shown in crossroads, as well as in surroundings of electroplating and paint factories.
Zhang F.,Wuhan University |
Li X.,Wuhan University |
Wang W.,Shenzhen Environmental Monitoring Center |
Ke X.,Huazhong Agricultural University |
And 2 more authors.
Advances in Meteorology | Year: 2013
Climate change caused by land use/cover change (LUCC) is becoming a hot topic in current global change, especially the changes caused by the grassland degradation. In this paper, based on the baseline underlying surface data of 1993, the predicted underlying surface data which can be derived through overlaying the grassland degradation information to the map of baseline underlying surface, and the atmospheric forcing data of RCP 6.0 from CMIP5, climatological changes caused by future grassland changes for the years 2010-2020 and 2040-2050 with the Weather Research Forecast model (WRF) are simulated. The model-based analysis shows that future grassland degradation will significantly result in regional climate change. The grassland degradation in future could lead to an increasing trend of temperature in most areas and corresponding change range of the annual average temperature of -0.1°C-0.4°C, and it will cause a decreasing trend of precipitation and corresponding change range of the annual average precipitation of 10 mm-50 mm. This study identifies lines of evidence for effects of future grassland degradation on regional climate in Mongolia which provides meaningful decision-making information for the development and strategy plan making in Mongolia. © 2013 Fan Zhang et al.