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| 1 | Land surface temperature retrieval for arid regions based on Landsat-8 TIRS data:a case study in Shihezi,Northwest China显示文摘Scientific interest in geophysical information about land surface temperature(LST) is ever increasing, as such information provides a base for a large number of applications, including environmental and agricultural monitoring. Therefore, the research of LST retrieval has become a hot topic. Recent availability of Landsat-8 satellite imagery provides a new data source for LST retrieval. Hence, exploring an adaptive method with reliable accuracy seems to be essential. In this study, basing on features of Landsat-8 TIRS thermal infrared channels, we re-calculated parameters in the atmospheric transmittance empirical models of the existing split-window algorithm, and estimated the ground emissivity with the help of the land cover classification map of the study area. Furthermore, a split-window algorithm was rebuilt by virtual of the estimation model of the updated atmospheric transmittance and the ground emissivity, and then a remote sensing retrieval for the LST of Shihezi city in Xinjiang Uygur autonomous region of Northwest China was conducted on the basis of this modified algorithm. Finally, precision validation of the new model was implemented by using the MODIS LST products. The results showed that the LST retrieval from Landsat-8 TIRS data based on our algorithm has a higher credibility, and the retrieved LST is more consistent with the MODIS LST products. This indicated that the modified algorithm is suitable for retrieving LST with competitive accuracy. With higher resolutions, Landsat-8 TIRS data may provide more accurate observation for LST retrieval. | Lei YANG YunGang CAO XiaoHua ZHU ShengHe ZENG GuoJiang YANG JiangYong HE XiuChun YANG | 2014 | Journal of Arid Land2014，6，6： | 17 |
| 2 | Characteristics of U-pattern distribution of high-concentration ^(210)Pb in surface air at central Guizhou,China显示文摘A better understanding of the variation of 210Pb concentrations in the surface air is the key to trace lake sedimentation and catchment erosion, to establish and vali-date the global diffusion model of contaminants, and to as-sess the impact of natural radiation on the ecological system. Basing on the study progresses of the sedimentation, the at-mospheric model and the unique environmental background in the Yunnan-Guizhou Plateau, and starting from December 20, 2001, we made use of a 500 NE Type aerosol sampler to collect filter samples, once a week in the past consecutive two years, in the surface air at Mt. Guanfeng, Guiyang City, China. Synchronous detailed γ -energy spectrometric obser-vations of 210Pb concentrations at both Chinese and U.S. laboratories have shown that the average monthly 210Pb concentration displays a regular U-patterns distribution of annual variations, with high values appearing in winter and low values in late spring and summer. The average annual 210Pb concentrations are estimated to be 2.77±0.63 mBq/m3, about 4 times the average maximum concentrations reported from quite a number of monitoring stations throughout the world. The possible factors affecting the sources of 210Pb in the surface air in the central part of Guizhou Province are: Release of 222Rn from the U-Ra series enriched in the soils; chemical weathering of carbonate rocks; the exploitation, processing and utilization of coal and phosphorous resources. The principal factor controlling the high 210Pb concentrations in the surface air in the central Guizhou and their annual U-pattern distribution is the release of 222Rn. The average monthly 210Pb concentrations show a good negative power- function relationship with increasing precipitation and also show a good negative linear-function relationship with the rise of air temperature in month grouping. Group No.1 (June to November) reflects a relatively low release of 222Rn from soils in relatively high temperature seasons; Group No.2 (December to May) mirrors a relatively high release of 222Rn from soils in relatively low temperature seasons. The average monthly 210Pb concentrations simulated in terms of the pre-cipitation and air temperature are in good consistency with the measured values, revealing that the regular U-pattern distribution characteristics of 210Pb concentrations in the surface air in the central Guizhou are controlled predomi-nantly by regional precipitation and air temperature. Meanwhile, it is also indicated that the magnitude of varia-tion of air temperature and precipitation within the same year also constrains the ratio of high values over low values of average monthly 210Pb concentrations. On a month time scale, precipitation and air temperature are a main factor affecting the release of 222Rn from soils (rocks). In this aspect strong evidence has been obtained. | WAN Guojiang YANG Wei WANG Shilu WAN Enyuan WU Fengchang S.N.LEE WANG Changsheng HUANG Ronggui | 2005 | Chinese Science Bulletin2005，50，16： | 2 |
| 3 | Anticoagulant surface modification of titanium via layer-by-layer assembly of collagen and sulfated chitosan multilayer显示文摘 | Quan-Li Li Nan Huang Jialong Chen Guojiang Wan Ansa Zhao Junying Chen Jin Wang Ping Yang Yongxiang Leng | 2009 | Journal of Biomedical Materials Research2009，，： | 1 |
| 4 | Theoretical calculation and experimental study of influence of oxygen vacancy on the electronic structure and hemocompatibility of rutile TiO_2显示文摘In this work,the relationship between electronic structure and hemocompatibility of oxygen deficient rutile TiO2-x was studied by both theoretical calculation and experimental study. Based on the local density functional theory,first-principals method was performed to calculate the electronic structure of rutile TiO2 with different oxygen vacancy concentration. In the range of less than 10% of (or equal) physically realistic O vacancy concentration,the band gap of rutile TiO2 increases with increasing O vacancy concentration,leading the TiO2 changes from a p-type to an n-type semiconductor. The valance band of TiO2 is predominated by O 2p orbital,while the conduction band is occupied by Ti 3d orbital for different O vacancy concentration. The O vacancy results in the occupation of electrons at the bottom of conduction band of TiO2,and the donor density increases with increasing O vacancy concentration. When materials come in contact with blood,the n-type semiconductor feature of oxygen deficient TiO2-x with the bottom of conduction band occupied by electrons would prevent charge transfer from fibrinogen into the surface of materials,thus inhibiting the aggregation and activation of platelets,therefore improving the hemocompatibility of rutile TiO2-x. | LEI YiFeng,LENG YongXiang,YANG Ping,WAN GuoJiang & HUANG Nan Key Laboratory of Advanced Materials Technology of Ministry of Education,Department of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China | 2009 | Science China(Technological Sciences)2009，52，9： | 0 |
| 5 | Synthesis of biheteroaryls via 2-methyl quinoline C(sp^(3))-H functionalization under metal-free conditions显示文摘An acetic acid-promoted C(sp^(3))-H functionalization of 2-methyl quinoline,enaminoesters and elemental sulfur for the synthesis of 3,4,5-trisubstituted isothiazoles under metal-free conditions has been developed.This approach provides viable access to various 5-(quinolin-2-yl)isothiazoles in moderate to good yields with good functional group tolerance.Moreover,the success of the gram-scale reaction gives this reaction a great potential application. | Dahan Wang Yuhan Yang Fuhong Xiao Jinbing Liu Guojiang Mao Guo-Jun Deng | 2024 | Green Synthesis and Catalysis2024，5，1： | 0 |
| 6 | Carbon-Doped Titanium Oxide Films by DC Reactive Magnetron Sputtering Using CO_2 and O_2 as Reactive Gas显示文摘CO2and O2were employed as reactive gases to fabricate carbon-doped titanium oxide films using DC reactive magnetron sputtering.Microstructure,composition and optical band gap of the films were investigated by X-ray diffraction,X-ray photoelectron spectroscopy,and UV–visible spectrophotometer,respectively.The results showed that carbon-doped titanium monoxide films(C-TiO) with a carbon concentration of 5.8 at.% were obtained in an Ar/CO2mixed atmosphere.However,carbon-doped rutile and anatase(C-TiO2) with a carbon concentration of about 1.4 at.% were obtained in an Ar/CO2/O2mixed atmosphere.The optical band gaps of C-TiO and C-TiO2were about 2.6 and 2.9 eV,respectively.Both of them were narrower than that of pure TiO2films.Films with narrowed optical band gap energy are promising in promoting their photo-catalytic activity. | Dong Xie Feng Wen Wenmao Yang Xueyuan Li Yongxiang Leng Guojiang Wan Hong Sun Nan Huang | 2014 | Acta Metallurgica Sinica(English Letters)2014，27，2： | 0 |
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