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Large contributions of emission reductions and meteorological conditions to the abatement of PM_(2.5)in Beijing during the 24th Winter Olympic Games in 2022

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Journal of Environmental sciences 2024年第2期136卷 172-188页

作者： Yaping Jiang Shaocai Yu Xue Chen Yibo Zhang Mengying Li Zhen Li Zhe Song Pengfei Li Xiaoye Zhang Eric Lichtfouse Daniel Rosenfeld Key Laboratory of Environmental Remediation and Ecological Health Ministry of EducationResearch Center for Air Pollution and HealthCollege of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China coll.ge of Science and Technology Hebei Agricultural UniversityBaoding 071000China Chinese Academy of Meteorological sciences China Meteorological AdministrationBeijing 100081China Aix-Marseille Univ CNRSColl FranceCNRSIRDINRAEEuropole Mediterraneen de l’ArboisAvenue Louis Philibert13100 Aix en ProvenceFrance Xi’an Jiaotong University State Key Laboratory of Multiphase Flow in Power EngineeringXi’an 710049China Institute of Earth sciences The Hebrew University of JerusalemJerusalemIsrael

To guarantee the blue skies for the 2022 Winter Olympics held in Beijing and Zhangjiakou from February 4 to 20,Beijing and its surrounding areas adopted a series of emission control *** provides an opportunity to determine the impacts of large-scale temporary control measures on the air quality in Beijing during this special ***,we applied the WRF-CMAQ model to quantify the contributions of emission reduction measures and meteorological *** show that meteorological conditions in 2022 decreased PM_(2.5)in Beijing by 6.9 and 11.8μg/m^(3)relative to 2021 under the scenarios with and without emission reductions,*** emission reduction measures implemented in Beijing and seven neighboring provinces resulted in an average decrease of 13.0μg/m^(3)(-41.2%)in PM_(2.5)in *** the entire period,local emission reductions contributed more to good air quality in Beijing than nonlocal emission *** the emission reduction scenario,local,controlled regions,other regions,and boundary conditions contributed 47.7%,42.0%,5.3%,and 5.0%to the PM_(2.5)concentrations in Beijing,*** results indicate that during the cleaning period with the air masses from the northwest,the abatements of PM_(2.5)were mainly caused by local emission ***,during the potential pollution period with the air masses from the east-northeast and west-southwest,the abatements of PM_(2.5)were caused by both local and nonlocal emission reductions almost *** implies that regional coordinated prevention and control strategies need to be arranged scientifically and rationally when heavy pollution events are forecasted.

关键词： PM_(2.5) WRF-CMAQ Meteorological conditions Emission reductions Winter Olympic games

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Characteristic Studies of Arylated β-Cyclodextrins in Host-Guest Complexation with Small Molecules

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Chinese Chemical Letters 1998年第3期9卷 265-268页

作者： Ai You HAO Lin Hui TONG Tian lin YANG and Ji Mao LIN(coll.ge of Chemistry Shandong University, Jinan250100)(Lanzhou Institute of Chemical Physics, Chinese Academy of sciences, Lanzhou730000)(Department of Chemistry Ningxia University, Yinchuan 750021) coll. of Chem. Shandong University Jinan 250100 China

The aryl moiety which was bonded as a functional group on the primary alcohol side ofβ-CD or the secondary alcohol side of β-CD or the secondary alcohol side of β-CD with anethylenediamino chain could show remarkable different molecular recognition abilities in thecomplexation with small molecular guests such as alkanes, cycloketones etc.

关键词： aryl moiety β-Cyclodextrin host-guest complexation molecular recognition ability

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Non-fragile decentralized H_∞ controller design for uncertain linear systems

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Journal of Systems Engineering and Electronics 2008年第2期19卷 321-328页

作者： Zhao Zhihua Chen Yuepeng Zhang Qingling coll. of sciences Tianjin Univ. Tianjin 300072 P. R. China School of Automation Wuhan Univ. of Technology Wuhan 430070 P. R. China Inst. of Systems Science Coll. of Science Northeastern Univ. Shenyang 110004 P. R. China

Considering the design problem of non-fragile decentralized H∞ controller with gain variations, the dynamic feedback controller by measurement feedback for uncertain linear systems is constructed and studied. The parameter uncertainties are considered to be unknown but norm bounded. The design procedures are investigated in terms of positive definite solutions to modify algebraic Riccati inequalities. Using information exchange among local controllers, the designed non-fragile decentralized H∞ controllers guarantee that the uncertain closed-loop linear systems are stable and with H∞ -norm bound on disturbance attenuation. A sufficient condition that there are such non-fragile H∞ controllers is obtained by algebraic Riccati inequalities. The approaches to solve modified algebraic Riccati inequalities are carried out preliminarily. Finally, a numerical example to show the validity of the proposed approach is given.

关键词： decentralized control stable H∞ controller algebraic Riccati inequalities gain variations non-fragile.

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Two New ent-Kaurane Diterpenoids from Isodon adenantha

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Chinese Chemical Letters 2000年第11期11卷 995-996页

作者： Jiang B. Xu J.C. Yang H. Zhao Q.S. Sun H.D. Laboratory of Phytochemistry Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Yunnan coll. Traditional Chinese M. Kunming 650200 China

Two new ent-kaurane diterpenoids, adenanthins B (1) and C (2), were isolated from the EtOAc extract of Isodon adenantha. Their structures were elucidated by spectroscopic evidences.

关键词： Two New ent-Kaurane Diterpenoids from Isodon adenantha HMBC

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Mapping the Antigenic Peptides of Sm26/2 in Glutathione S-Transferases of Schistosoma Mansoni

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Chinese Chemical Letters 1998年第4期9卷 377-379页

作者： Jia Xi XU Meng Shen CAI(coll.ge of Chemistry and Molecular Engineering, Peking University, Beijing 100871 (School of Pharmaceutical sciences, Beijing Medical University, Beijing 100083) coll. of Chem./Molec. Engineering Peking University Beijing 100871 China School of Pharmaceutical sciences Beijing Medical University Beijing 100083 China

Six antigenic peptides of Sm26/2 glutathione S-transferase of schistosoma mansoni have been predicted according to their hydrophilicity, flexibility, accessibility, charge distribution and beta-turn in the secondary structure by the determination of its primary structure, and synthesized by solid phase method. Two of them showed good antigenicity by Dot-ELISA. They would be candidate peptides of synthetic anti-schistosomal vaccine.

关键词： schistosoma mansoni glutathione S-transferase antigenic peptide peptide vaccine

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Non-normal Hasemann Boundary Value Problem

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Wuhan University Journal of Natural sciences 2001年第3期6卷 649-651页

作者： Cai Hao-tao Du Jin-yuan coll. of Mathematics and Statistics Wuhan University Wuhan 430072 China

We will discuss the non-normal Hasemann boundary value problem: we may find these results are coincided with those of normal Hasemann boundary value problem and non-normal Riemann boundary value problem.

关键词： non-normal positive transformation canonical function

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Regularity properties of a class of hybrid methods

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Communications in Nonlinear Science and Numerical Simulation 2000年第1期5卷 27-30页

作者： Daxue CHEN and Aiguo XIAO Department of Basic sciences, Xiangtan coll.ge of Mechanical and Electrical Engineering, Xiangtan411101, China Department of Mathematics, Xiangtan University, Xiangtan 411105, China e-mail: xiaoag@xtu. edu. cn, xag@lsec. cc. ac Department of Basic sciences Xiangtan Coll. Mech. and Elec. Eng. Xiangtan 411101 China Department of Mathematics Xiangtan University Xiangtan 411105 China

The existence of spurious steady solutions and period-2 solutions in constant timestep is studied. The concepts of R[1]-regularity and R[2]-regularity of a class of hybrid methods for dynamical systems of ordinary differential equations are introduced and studied. Some conditions guaranteeing R[1]-regularity and R[2]-regularity of such methods applied to dynamical systems of ordinary differential equations with some important structures are given.

关键词： hybrid method dynamical system regularity spurious solution

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Prediction, Synthesis and Antigenicity of the Antigenic Peptides of 26kDa Glutathione S-Transferasc of Schistosoma Japonicum (Sj26)

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Chinese Chemical Letters 1999年第1期10卷 27-28页

作者： Jia Xi XU Meng Shen CAI(coll.ge of Chemistry and Molecular Engineering, Peking University, Beijing 100871)(School of Pharmaceutical sciences, Beijing Medical University. Beijing 100083) coll. of Chem. and Molec. Eng. Peking University Beijing 100871 China School of Pharmaceutical sciences Beijing Medical University Beijing 100083 China

Six antigenic peptides of 26 kDa glutathione S-transferase of Schistosoma japonicum(Sj26) have been predicted according to their hydrophilicity, flexibility. accessibility. chargedistribution and β -turn in the secondary structure by the determination of its primary structure andsynthesized by solid phase method. All of them showed antigenicity with anti-schistosomajaponicum immunoglobulin polyclonal antibody, anti-Sj-lgG PcAb by Dot-ELISA. Three of themshowed good antigenicity. They would serve as candidates of synthetic anti-schistosomal vaccine.

关键词： SchistosomajQPonicum glutathione S-transferase antigenic peptide peptide vaccine.

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Vacancies and Antisites in B2 FeAl and DO_3 Fe_3Al with a Modified Analytic EAM Model

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Journal of Materials Science & Technology 2001年第6期17卷 601-604页

作者： Xiaolin SHU, Wan gyu HU, Hanning XIAO and Huiqiu DENG coll.ge of Materials Science and Engineering, Hunan University, Changsha 410082, China Ban gwei ZHANG International Centre of Materials Physics, Chinese Academy of sciences, S coll. of Mat. Sci. and Eng. Hunan Univ. Changsha 410082 China

A simple modified analytic EAM model for bcc Fe and fcc Al was used to calculate the lattice constant and elastic constants of B2 FeAl and DO3 Fe3Al alloys. The formation energies of ... 详细信息

A simple modified analytic EAM model for bcc Fe and fcc Al was used to calculate the lattice constant and elastic constants of B2 FeAl and DO3 Fe3Al alloys. The formation energies of vacancy and antisite were also calculated. The present calculations are in agreement with the experimental data and the theoretical results obtained by other authors.

关键词： Al DO Fe Vacancies and Antisites in B2 FeAl and DO3 Fe3Al with a Modified Analytic EAM Model EAM

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A New Triterpenoid Saponin: Se-saponin A

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Chinese Chemical Letters 2000年第4期11卷 333-336页

作者： Hui YANG~(1,2) Qin MU~1 Yi Neng HE~1 Han Dong SUN~1 (1Laboratory of Phytochemistry, Kunming Institute of Botany, Chinese Academy of sciences. Kunming 650204 (2Chemistry Department, coll.ge of Life Science and Chemistry, Yunnan University, Kunming 650091) Laboratory of Phytochemistry Kunming Institute of Botany Chinese Academy of Sciences Kunming 650204 China Chemistry Department Coll. of Life Science and Chemistry Yunnan University Kunming 650091 China

A new triterpenoid saponin, se-saponin A, was isolated from the aerial parts of Clerodendrum serratum var. amplexifolium Moldenke. Its structure was determined by spectral and chemical methods. Only one triterpenoid s... 详细信息

关键词： Clerodendrum serratum Verbenaceae triterpenoid saponin se-saponin A

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