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| 1 | Particulate matter pollution in Kunshan High-Tech zone: Source apportionment with trace elements, plume evolution and its monitoring显示文摘Particulate matter(PM) in the Kunshan High-Tech zone is studied during a three-month campaign. PM and trace elements are measured by the online pollution monitoring, forecastwarning and source term retrieval system AS3. Hourly measured concentrations of PM_(10), PM_(2.5) and 16 trace elements in the PM_(2.5) section(Ca, Pb, Cu, Cl, V, Cr, Fe, Ti, Mn, Ni, Zn, Ga, As, Se, Sr, Ba)are focused. Source apportionment of trace elements by Positive Matrix Factorization modeling indicates that there are five major sources, including dust, industrial processing, traffic,combustion, and sea salt with contribution rate of 23.68%, 21.66%, 14.30%, 22.03%, and 6.89%,respectively. Prediction of plume dispersion from concrete plant and traffic emissions shows that PM_(10) pollution of concrete plant is three orders of magnitude more than that of the traffic. The influence range can extend to more than 3 km in 1 hr. Because the footprint of the industrial plumes is constantly moving according to the local meteorological conditions, the fixed monitoring sites scattered in a few hundred meters haven't captured the heaviest pollution plume at the local scale of a few km^2. As a more intensive monitoring network is not operationally possible, the use of online modeling gives accurate and quantitative information of plume location, which increases the spatial pollution monitoring capacity and improves the understanding of measurement data. These results indicate that the development of the AS3 system, which combines monitoring equipment and air pollution modeling systems, is beneficial to the real-time pollution monitoring in the industrial zone. | Suwei Zhang Qijie Zhang Armand Albergel Didier Buty Liangmin Yu Haiting Wang Wuxia Bi Peng Cheng Fu Chen Jun Fang Ruirui Hou Xudong Luan Changgan Shu Jingjing Su | 2018 | Journal of Environmental Sciences2018，30，9： | 3 |
| 2 | Determination of trace mercury species by high performance liquid chromatography- inductively coupled plasma mass spectrometry after cloud point extraction显示文摘 | CHEN Haiting CHEN Jianguo JIN Xianzhong | 2009 | Journal of Hazardous Materials2009，172，23： | 1 |
| 3 | Determination of trace mercury species by HPLC-ICP-MS after cloud point extraction显示文摘 | Chen Haiting Chen Jianguo Jin Xianzhong | 2009 | Journal of Hazardous Materials2009，，172： | 1 |
| 4 | General and Modular Access to Enantioenriched α-Trifluoromethyl Ketones via Nickel-Catalyzed Reductive Trifluoroalkylation显示文摘The development of new catalytic enantioselective access to stereogenic CF_(3)-containingmolecules is of great interest for expediting the discovery of lead compounds that remain challenging.Specifically,enantioselective synthesis of valuable ketones featuring stereogenicα-CF_(3) has rarely been reported.We devise a general and modular approach to facilely access enantioenrichedα-CF_(3) ketones via nickel-catalyzed reductive cross-coupling of readily available acid chlorides and racemicα-CF_(3) alkyl bromides in an enantioconvergent fashion under mild conditions.This protocol features neighboring directing group-free,high chemoselectivity,excellent functional group tolerance,facile scale-up,and notable amenability to straightforward downstream elaboration toward pharmaceutically useful enantioenrichedβ-trifluoromethylated secondary and tertiary alcohols,thus constituting a reliable,direct,practical,and efficient synthetic alternative to furnish enantiopureα-CF_(3) carbonyls.Interestingly,an appropriate choice of the phosphine ligand as coligand plays an important role in high efficiency and asymmetric induction.Mechanistic studies suggest a radical chain pathway. | Dengkai Lin Yongzhi Chen Zhan Dong Pan Pei Haiting Ji Lanzhu Tai Liang-An Chen | 2023 | CCS Chemistry2023，5，6： | 0 |
| 5 | Design of phase interface and defect in niobium-nickel oxide for ultrafast Li-ion storage显示文摘Niobium pentoxide(Nb2O5)has attracted much attention in lithium batteries due to its advantages of high operating voltage,large theoretical capacity,environmental friendliness and cost-effectiveness.However,the intrinsic poor electrical conductivity,sluggish kinetics,and large volume changes hinder its electrochemical performance at high power density,making it away from the requirements for practical applications.In this research work,we regulate the electron transport of niobium-nickel oxide(NiNbO)anode material with enhanced structural stability at high power density by constructing the two-phase boundaries between niobium pentoxide(Nb2O5)and nickel niobate(NiNb2O6)through simple solid phase reaction.In addition,the presence of lattice defects in NiNbO-F further speeds up the transport of Li+and promotes the electrochemical reaction kinetics more effectively.The two-phase boundaries and defect modulated anode material displays high Li+diffusion coefficient of 1.63×10^(−10) cm^(2) s^(−1),pretty high initial discharge capacity of 222.8 mAh g^(−1) at 1 C,extraordinary high rate performance(66.7 mAh g^(−1))at an ultrahigh rate(100 C)and ultra-long cycling stability under high rate of 25 C(83.4 mAh g^(−1) after 2000 cycles)with only 0.016%attenuation per cycle.These results demonstrate an effective approach for developing electrode materials that greatly improve rate performance and durability. | Haiting Chen Haoyan Cheng Hangchen Liu Yibo Hu Tongtong Yuan Shuge Dai Meilin Liu Hao Hu | 2023 | Journal of Materials Science & Technology2023，，16： | 0 |
| 6 | Design of Large-aperture and Wide-band Optical Lens显示文摘The design of a large-aperture and wide-band optical lens for camera is presented. By utilizing the atmospheric window of infrared light, clear images can be achieved in the dark or poor visibility conditions. To use near-infrared and visible light to obtain images, the charge coupled device(CCD) is adopted as the image sensor of the lens with the center wavelength of 880 nm, which operates at the wavelength range from 400 nm to 1 000 nm. After calculating the parameters of optical lens, Sunnah type is selected as the initial structure. Through the optimization of optical design software ZEMAX, the lens obtains an excellent imaging performance. The modulation transfer function(MTF) can be more than 0.3 at the spatial frequency of 110 lp/mm, and the maximum distortion can be less than 0.1%. | ZHANG Shanhua, CHEN Huifang, ZHANG Haiting, TIAN Weijian (Institute of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, CHN) | 2010 | Semiconductor Photonics and Technology2010，16，4： | 0 |
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