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| 1 | Irrigation-induced pollution of organochlorine pesticides and polychlorinated biphenyls in paddy field ecosystem of Liaohe River Plain,China显示文摘In order to assess the influence of long-term irrigation of polluted river water on the ecological health of the rice fields in the low reach of Liaohe River Plain,a series of environmental samples and biological samples in rice fields,including sediments,paddy soils,mitten-handed crabs(Eriocheir sinensis),loaches(Misgurnus anguillicaudatu) and frog(Hoplobatrachus tigerinus),were collected from the area far away from industrial zones,and polychlorinated biphenyls(PCBs) and organochlorine pesticides(HCH,DDT,HCB and Mirex) were analyzed by high resolution gas chromatography coupled with high resolution mass spectrometry(HRGC/HRMS).The comparison of pollutant concentrations and profiles verified that the significant contribution of river water irrigation to PCBs contaminations in paddy soils and the mutual influence of organochlorine pesticide contamination between river sediments and paddy soils.Bioaccumulations of PCBs and organochlorine pesticides in mitten-handed crabs and loaches were site-specific,suggested that they were both the good indicators of ecosystem health.Mitten-handed crabs had the highest capacity to accumulate PCBs and organochlorine pesticides,and also they had the strong ability to degrade these pollutants in their bodies,especially for DDT and HCH.The biota-soil accumulation factors(BSAF) of ΣH CH,ΣDDT,Mirex,HCB and ΣP CBs in mitten-handed crab were calculated to be 24.5,15.3,122.2,28.1 and 54.6,respectively.In view of the strong bioaccumulation ability,the health risk should be concerned for the cultivation of mitten-handed crabs in paddy fields in the low reach of Liaohe River Plain. | TENG Man ZHANG HaiJun FU Qiang LU XianBo CHEN JiPing WEI FuSheng | 2013 | Chinese Science Bulletin2013，58，15： | 2 |
| 2 | Ladder-Type Thienoacenaphthopyrazine-Based Molecules:Synthesis,Properties,and Application to Construct High-Performance Polymer for Organic Solar Cells显示文摘We present a new design strategy to synthesize ladder-type thienoacenaphthopyrazine(TAP)-based monomers through two different coupling reactions from starting material 5,6-dibromoacenaphthylene-1,2-dione.By bringing varous electron-deficient groups together(such as five-membered aromatic rings,pyrazine,fluorine,and thiadiazols),this new family of molecules exhibits good stability in ambient conditions and easily tunes the electronic,photophysical and film-forming properties of polymers.The unique molecular shape with its extendedπ-conjugated backbone perpendicular to the polymer chain,offers a remarkable platform for the development of a semiconducting polymer with rare geometry.The planar and enlarged conjugated backbone enables TAP-based copolymers PTAP1 and PTAP2 to exhibit distinguishing solubility properties that are different from small-molecule-based polymers,indicating the advantages of novel ladder-type monomers.Their insolubility in chloroform supports orthogonal solvent processing to fabricate layer-by-layer organic solar cells(LBL-OSCs).Owing to its shorterπ–πstacking distance,higher hole mobility,and more favorable phase separation caused bymultifluorine substitution,polymer PTAP1-based LBL-OSC exhibits the highest efficiency of 17.14%by using Y6-BO as the electron acceptor while the efficiency for the PTAP2-based device is 14.20%.This high efficiency indicates the tremendous potential of these novel building units. | Pengwei Han Man Lin Qiuju Jiang Haijun Ning Mingbin Su Li Dang Feng He Qinghe Wu | 2023 | CCS Chemistry2023，5，6： | 0 |
| 3 | Periodic Variations of Drag Coefficient for the ANDE Spherical Satellites During its Lifetime显示文摘A drag coefficient(C_d) inversion method is introduced to study the variations of the drag coefficient for orbital satellites with spherical geometry.Drag coefficients of the four micro satellites in the Atmospheric Neutral Density Experiment(ANDE) are compiled out with this new method. The Lomb-Scargle Periodgram(LSP) analysis of the four ANDE satellites' C__d series has shown that there are obvious 5,7,9,and 27 days' period in those data.Interesting results are found through comparing the LSP analysis with series of the daily solar radio flux at 10.7cm(F_(10.7) index),the Ap index,and the daily averaged solar wind speed at 1AU.All series in the same time interval have an obvious period of about 27 days,which has already been explained as the association with the 27 days' solar rotation.The oscillating periods less than 27 days are found in series of C_D,Ap and solar wind speed at 1 AU,e.g.,the 5,7,9 days period.However,these short periods disappeared in the time series of F_(10.7) index.The same periodicities of 5,7,9 days in Ap and solar wind are presented at the same time interval during the declining phase of solar cycle 23.While in the ascending phase of solar cycle 24,these short oscillations are not so obvious as that in the declining phase of solar cycle 23.These results provide definite evidence that the C_d variations with period of 5,7 and 9 days are produced by a combination of space weather effects caused by the solar wind and geomagnetic activity. | QI Yalong LI Huijun XIANG Jie MAN Haijun | 2013 | 空间科学学报2013，33，5： | 0 |
| 4 | APOD mission status and preliminary results显示文摘On September 20 th, 2015, twenty satellites were successfully deployed into a near-polar circular orbit at 520 km altitude by the Chinese CZ-6 test rocket, which was launched from the Tai Yuan Satellite Launch Center. Among these satellites, a set of 4 Cube Sats conform the atmospheric density detection and precise orbit determination(APOD) mission, which is projected for atmospheric density estimation from in-situ detection and precise orbit products. The APOD satellites are manufactured by China Spacesat Co. Ltd. and the payload instruments include an atmospheric density detector(ADD), a dual-frequency dualmode global navigation satellite system(GNSS) receiver(GPS and Beidou), a satellite laser ranging(SLR) reflector, and an S/Xband very long baseline interferometry(VLBI) beacon. In this paper, we compare the GNSS precise orbit products with colocated SLR observations, and the 3 D orbit accuracy shows better than 10 cm RMS. These results reveal the great potential of the onboard micro-electro-mechanical system(MEMS) GNSS receiver. After calibrating ADD density estimates with precise orbit products, the accuracy of our density products can reach about 10% with respect to the background density. Density estimates from APOD are of a great importance for scientific studies on upper atmosphere variations and useful for model data assimilation. | Geshi TANG Xie LI Jianfeng CAO Shushi LIU Guangming CHEN Haijun MAN Xiaomin ZHANG Sihan SHI Ji SUN Yongping LI Andres CALABIA | 2020 | Science China Earth Sciences2020，63，2： | 0 |
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