Food safety is a major concern for the Chinese public. This study collected 465 published papers on heavy metal pollution rates (the ratio of samples exceeding Grade II limits soils, Soil Environmental Quality Standard-1995) in farmland soil throughout China. The results showed that Cd had highest rate 7.75%, followed by Hg, Cu, Ni and Zn, Pb Cr lowest at lower than 1%. total was 10.18%, mainly from Cd, Ni. human activities mining smelting, industry, irrigation sewage, urban development,...

cis,cis-1,2,3,4-Tetraphenylbutadiene (TPBD) exhibits aggregation-induced emission (AIE) in the UV-blue band: photoluminescence (PL) quantum yield of TPBD aggregates can differ from that molecularly dissolved species by 2 orders magnitude (>200). When isolated molecules solutions are cooled to extremely low temperature, they also emit intense light comparable solid state. thin layer shows on−off fluorescence switching behavior be utilized for sensing organic vapors. The phenyl substituents...

The Advanced Along-Track Scanning Radiometer (AATSR) land surface temperature (LST) product has a long-term time series of data from 20 May 2002 to 8 April 2012 and is crucial dataset for global change studies. Accuracy uncertainty assessment satellite derived LST important its use in studying land–surface–atmosphere interactions. However, the validation AATSR-derived products scarce China, especially arid semi-arid areas. In this study, we evaluated accuracy AATSR using ground-based...

Due to the Sustainable Development Goals (SDGs) being designed at both national and globally applicable level, it is challenging adequately reflect local context characteristics in different urban regions without fully utilizing big earth data. To effectively address this issue, study localized 73 indicators for 13 SDGs assessed forecasted sustainability across 18 cities Hainan (2010-2030) using Our analysis specifically focused on indicator score, goal SDG index, spatial spillover effect,...

The central problem of temperature and emissivity separation (TES) is, as Realmuto had pointed out, that we obtain N spectral measurements radiance need to find N+1 unknowns (N emissivities one temperature), if the atmospheric perturbations are well corrected for. Thus, constraint must be found in retrieval realistic solution for temperature/emissivity separation. A new index called `Downwelling Radiance Residual Index' (DRRI) is proposed provide this type constraint. Tests with simulated...

Sensitivity analysis of temperature-emissivity separation method commonly applied to hyperspectral data various sources errors is performed in this paper. In terms resulting the process retrieving surface temperature, results show that: (1) Satisfactory can be obtained for heterogeneous land surfaces and retrieval error temperature small enough neglected all atmospheric conditions. (2) Separation downwelling radiance from at-ground not very sensitive uncertainty column water vapor (WV)...

Abstract 2,5‐Bis(2‐bromofluorene‐7‐yl)silole was prepared by a modified one‐pot synthesis with reverse addition procedure, from which novel silole‐containing polyfluorenes binary random and alternating structures (silole contents between 4.5 25% high M w up to 509 kDa were successfully synthesized. The well‐defined repeating unit of the copolymer comprises terfluorene silole ring. Optoelectronic properties including UV absorption, electrochemistry, photoluminescence (PL), electroluminescence...

High-resolution land surface temperature (LST) data are essential for fine-scale urban thermal environment studies. Urban LST downscaling studies mostly remain focused on only two-dimensional (2-D) data, and neglect the impact of three-dimensional (3-D) structure LST. In addition, choice window size is also important over heterogeneous surfaces. this study, we downscaled Landsat-LST using localized stepwise approaches in a random forest model (RF). both 2- 3-D building morphologies were...

Satellite-derived rugged land surface temperature (LST) is an important parameter indicating the status of Earth’s energy budget and its seasonal/temporal dynamic change. However, existing LST products from areas are more prone to error when supporting applications in mountainous Earth processes that occur at high spatial temporal resolutions. This research aimed develop a method for generating with resolution by using improved ensemble model combining three regressors, including random...

Sensible heat exchange has important consequences for urban meteorology and related applications. Directional radiometric surface temperatures of canopies observed by remote sensing platforms have the potential to inform estimations sensible flux. An imaging radiometer viewing from nadir cannot capture complete temperature, which is defined as mean temperature over all facets in three dimensions, includes building wall requires an estimation In this study, a numerical microclimate model,...

Abstract. In recent years, photochemical smog has been a major cause of air pollution in the metropolitan area Guangzhou, China, with continuing increase concentrations pollutants. The concentration peroxyacetyl nitrate (PAN) often found to reach very high levels, posing potential threat public health. To better understand changes PAN and its sources, study was carried from January December 2012 at Guangzhou Panyu Atmospheric Composition Station (GPACS) measure atmospheric as well those...

Land surface temperature (LST) is one of the key state variables for many applications. This article aims to apply our previously developed LST retrieval method infrared atmospheric sounding interferometer (IASI) and sounder (AIRS) data. On basis opposite characteristics spectral absorption emissivity, a 'downwelling radiance residual index' (DRRI) has been recalled improved obtain emissivity. To construct an efficient DRRI, automatic channel selection procedure proposed, 11 groups channels...

Ground surface temperature (GST) measurements are scarce in Tibetan plateau (TP), whereas the satellite observations and numerical weather model outputs good alternatives to fill spatial gaps among ground stations. However, evaluation of different products is challenging due distinct temporal dimensions their acquisition methods. This paper intended develop an framework for comparing performances various data, including Advanced Along-Track Scanning Radiometer (AATSR) land (LST) high Asia...

Land surface temperature (LST) and near-surface air products have been commonly used in the studies of global climate change. In this work, we compare satellite-observed LST from Advanced Along-Track Scanning Radiometer (AATSR) skin 2 m (T2) simulated High Asian Refined analysis (HAR) to provide an independent overview surface/air trend over Tibetan Plateau (TP) region 2003–2011. We investigate seasonal trend, spatial variability, elevation dependency TP for last decade. Linear regression...

Driven by the 2030 Agenda for Sustainable Development, importance of sustainable urbanization has taken center stage. In this study, we investigate impact polycentric structures on CO2 emissions using data from 279 Chinese cities and employing two-way fixed effects complemented instrumental variables. Our findings indicate that effectively alleviate emissions. We identify two key pathways through which contribute to reduction: promoting green technology curbing energy consumption....