检索结果-内蒙古大学图书馆

The Variation, Source, and Environmental Impact of Chloride Across China: Summarized Field Results Based on the Aerosol Mass Spectrometer (AMS)

引用

Journal of Geophysical Research: Atmospheres 2025年第11期130卷

作者： Mingkai Liu Zhaoce Liu Jun Wang Wei Chen Tingting Feng Tianle Pan Bin Yuan Shan Huang Min Shao Min Hu Xinming Wang Weiwei Hu State Key Laboratory of Advanced Environmental Technology Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Science Guangzhou China Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization Chinese Academy of Science Guangzhou China University of Chinese Academy of Sciences Beijing China Now at Division of Environment & Sustainability Hong Kong University of Science & Technology Hong Kong China Institute for Environmental and Climate Research Jinan University Guangzhou China Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality Guangzhou China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and Engineering Peking University Beijing China

Despite numerous field studies focusing on the chemical composition of particulate matter, systematic investigations on particulate chloride (Cl − ) are scarce in China. This study examines the spatiotemporal distribution, origin, and environmental impact of Cl − across China via compiling a comprehensive data set of submicron aerosol (PM 1 ) detected by the aerosol mass spectrometer (AMS). In addition, we integrated high-time resolution aerosol composition data from AMS at six representative sites in China for more detailed insights. The mass concentration of Cl − across China is notably high (1.9 ± 2.7 μg m −3 ) in comparison to the global average (0.3 ± 1.0 μg m −3 ), with a distinguished N–S pattern (North > South) and a distinct seasonality (winter > other seasons). Three categories of Cl − diurnal variations were classified, suggesting the primary combustion emission and gas/particle partitioning are the main drivers for the dynamic variation of Cl − . The good correlation between Cl − and combustion tracers corroborates the assertion that coal and biomass combustion are the main anthropogenic sources of Cl − based on emission inventory. Furthermore, the quantified environmental impacts of Cl − on ammonium balances, aerosol liquid water content, and hygroscopicity were systematically explored. In extreme cases, the Cl − can enhance 100% ALWC during polluted periods, signifying its key role in impacting the physiochemistry of aerosols. The mutual promotion between Cl − and other environment effects was also found. In summary, this study enhances our understanding of the distribution, sources, and environmental effects of Cl − across China, indicating that Cl − should be systematically considered in elucidating environment effect of fine particles.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Hole-Mediated Lattice Oxygen Redox Design for Perovskite Oxide Catalysts

引用

Angewandte Chemie 2025年

作者： Dr. Xinbo Li Dr. Xiyang Wang Dr. Yaowen Wang Dr. Jingze Shao Prof. Yimin A. Wu Dr. Subhajit Jana Prof. Haozhe Liu Prof. Yue Peng Dr. Zhiyao Wu Dr. Zhen Li Dr. Yingge Cong Prof. Yawen Zhang Prof. Guangshe Li Prof. Liping Li State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 China Department of Mechanical and Mechatronics Engineering Waterloo Institute for Nanotechnology Materials Interface Foundry University of Waterloo Waterloo Ontario N2 L 3G1 Canada Center for High Pressure Science and Technology Advanced Research Beijing 100094 China State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi University Nanning 530004 China CAS Key Laboratory of Bio Medical Diagnostics Suzhou Institute of Biomedical Engineering and Technology Chinese Academy of Sciences Suzhou 215163 China Beijing National Laboratory for Molecular Sciences (BNLMS) State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Present design and application of perovskite oxide catalysts assume lattice oxygen redox (LOR) mechanisms that depend on lattice oxygen activity without consideration of the entire redox cycle. Herein, using in situ characterizations and theoretical calculations, we uncover a hole-mediated LOR cycle on p-type Sr-deficient SrFeO 3–δ (SFO-Srv) perovskites in CO oxidation reaction. Sr vacancies activate surface lattice oxygen of SFO-Srv and promote formation of highly covalent Fe (4–x)+ -O (2–x)– sites. In situ electrical conductivity measurement demonstrates that holes directly participate in the entire LOR cycle, and are reversibly consumed and regenerated in reducing/oxidizing atmosphere via Fe (4–x)+ -O (2–x)– sites of SFO-Srv. Hole-mediated LOR in SFO-Srv, as revealed by in situ soft X-ray absorption spectroscopy, occurs through changing in covalency of Fe−O bonds, O 2p hole state, and electron density of Fe sites. 18 O 2 labeling experiment further confirms an improved Mars–van Krevelen pathway in the hole-mediated LOR cycle, which accounts for a ten-times enhancement of SFO-Srv for CO reaction rate over that of SFO alone.

关键词： p-type perovskite oxides Sr vacancy lattice oxygen redox reaction mechanism SrFeO3

来源：评论

学校读者我要写书评

暂无评论

Effects of ultrasonic treatment on dithiothreitol(DTT) assay measurements for carbon materials

引用

Journal of Environmental Sciences 2019年第10期31卷 51-58页

作者： Haotian Jiang Yun Xie Yanli Ge Hong He Yongchun Liu State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center forEco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Aerosol and Haze Laboratory Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China Key Laboratory of Environmental Biotechnology Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China Center for Excellence in Urban Atmospheric Environment Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021China

The dithiothreitol(DTT)assay is the most commonly used method to quantify the oxidative potential of fine ***,the reported DTT decay rates of carbon black(CB)materials vary greatly among different *** might have resulted from either the intrinsic toxicity of CB or the unsuitability of the DTT assay protocol for CB *** the current study,the protocol of the DTT assay for CB materials has been carefully *** was found that the dispersion degree of CB particles in water has a great influence on the DTT decay rate of CB *** CB particles(special black 4A(SB4A)and Printex U)and single-walled carbon nanotube tube(SWCNT),the DTT decay rate after sonication for 10 min became 4.2,4.6 and 1.7 times higher than that without *** rate continued to grow as a function of ultrasound time up to 30 min of *** the concentration of soluble transition metals and surface oxygen-containing species such as carbonyls increased slightly with sonication,they had no significant effects on the measured DTT activity,while the increase in the dispersion degree of aggregates was found to play a vital role in the observed enhancement of the DTT decay rates for different CB *** on our results,30 min of sonication is recommended for sample dispersion when measuring the DTT decay rate of CB materials.

关键词： Sonication Dispersion Dithiothreitol(DTT) assay Carbon nanomaterials

来源：评论

学校读者我要写书评

暂无评论

Novel pH-responsive hybrid hydrogels for controlled delivery of curcumin: Overcoming conventional constraints and enhancing cytotoxicity in MCF-7 cells

Hybrid Advances

引用

Hybrid Advances 2024年 6卷

作者： Pourmadadi, Mehrab Gerami, Saman Emami Ajalli, Narges Yazdian, Fatemeh Rahdar, Abbas Fathi-karkan, Sonia Aboudzadeh, M. Ali Protein Research Center Shahid Beheshti University Tehran GC *** Iran School of Chemical Engineering College of Engineering University of Tehran Tehran Iran Department of Life Science Engineering Faculty of New Science and Technologies University of Tehran Tehran Iran Department of Physics Faculty of Sciences University of Zabol Zabol 538-98615 Iran Key Laboratory of Modeling and Simulation-based Reliability and Optimization University of Zabol Zabol Iran Natural Products and Medicinal Plants Research Center North Khorasan University of Medical Sciences Bojnurd 94531-55166 Iran Department of Advanced Sciences and Technologies in Medicine School of Medicine North Khorasan University of Medical Sciences Bojnurd *** Iran POLYMAT and Department of Polymers and Advanced Materials: Physics Chemistry and Technology Faculty of Chemistry University of the Basque Country UPV/EHU Paseo Manuel de Lardizabal 3 Donostia-San Sebastián 20018 Spain

Traditional drug delivery techniques often have drawbacks such inadequate bioavailability, quick clearance, and non-specific targeting, which may result in unfavorable side effects. Hybrid nanocarriers composed of nanoclay have the potential to be a viable solution to these problems. The goal of this work was to design a biocompatible hybrid nanocarrier that would release curcumin under regulated conditions to specific locations, especially cancer cells. FTIR, XRD, and FESEM were used to effectively construct and evaluate our polyvinyl pyrrolidone/polyethylene glycol/montmorillonite (PVP/PEG/MMT) hybrid hydrogels, verifying their synthesis and intended features. Zeta potential and DLS studies showed a suitable size distribution (∼300 nm) and high stability. The curcumin encapsulation efficiency and release profile were assessed using the use of UV spectrophotometry and the dialysis bag technique. The findings showed a gradual and continuous release that was highly impacted by the acidic environment (which mimicked the characteristics of cancer cells), suggesting pH-responsive activity. The MTT test was used in vitro cytotoxicity experiments to show that curcumin-loaded nanocarriers were more effective against MCF-7 cancer cells than curcumin in solution. Increased rates of necrosis and apoptosis in cancer cells treated with the nanocarrier formulation were further validated by flowcytometry. According to these results, PVP/PEG/MMT hybrid hydrogels have a lot of potential as a cutting-edge drug delivery strategy for curcumin. They may be able to overcome some of the drawbacks of traditional techniques and improve the effectiveness of treatment against cancer cells. © 2024 The Authors

关键词： Cancer Curcumin Cytotoxicity Hybrid hydrogel pH-responsive Polyvinylpyrrolidone

来源：评论

学校读者我要写书评

暂无评论

Ferroelectric control of single-molecule magnetism in 2D limit

引用

Science Bulletin 2020年第15期65卷 1252-1259,M0003页

作者： Xinwei Wang Chengcheng Xiao Chao Yang Miaogen Chen Shengyuan A.Yang Jun Hu Zhaohui Ren Hui Pan Wenguang Zhu Zhu-An Xu Yunhao Lu State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang UniversityHangzhou 310027China Departments of Materials and the Thomas Young Centre for Theory and Simulation of Materials Imperial College LondonLondon SW72AZUK Department of Physics China Jiliang University.Hangzhou 310018China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore 487372Singapore School of Physical Science and Technology Soochow UniversitySuzhou 215006China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao SARChina ICQD Hefei National Laboratory for Physical Science at the MicroscaleKey Laboratory of Strongly-Coupled Quantum Matter PhysicsChinese Academy of SciencesDepartment of Physicsand Synergetic Innovation Center of Quantum Information and Quantum PhysicsUniversity of Science and Technology of ChinaHefei 230026China Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China Collaborative Innovation Centre of Advanced Microstructures Nanjing UniversityNanjing 210093China

The electric control of magnetic properties based on magnetoelectric effect is crucial for the development of future data storage ***,based on first-principles calculations,a strong magnetoelectric effect is proposed to effectively switch on/off the magnetic states as well as alter the in-plane/perpendicular easy axes of metal-phthalocyanine molecules(MPc)by reversing the electric polarization of the underlying two-dimensional(2D)ferroelectric a-In2Se3 substrate with the application of an external electric *** mechanism originates from the different hybridization between the molecule and the ferroelectric substrate in which the different electronic states of surface Se layer play a dominant ***,the magnetic moments and magnetic anisotropy energies(MAE)of OsPc/In2Se3 can be further largely enhanced by a functionalized atom atop the OsPc *** I-OsPc/In2Se3 system possesses large MAE up to 30 meV at both polarization directions,which is sufficient for room-temperature *** findings provide a feasible scheme to realize ferroelectric control of magnetic states in 2D limit,which have great potential for applications in nanoscale electronics and spintronics.

关键词： Magnetoelectric effect Two-dimensional ferroelectric Single-molecular magnets In2Se3 Metal-phthalocyanine molecules

来源：评论

学校读者我要写书评

暂无评论

An N/D study of the S11channel πn scattering amplitude

arXiv

引用

arXiv 2021年

作者： Li, Qu-Zhi Ma, Yao Niu, Wen-Qi Wang, Yu-Fei Zheng, Han-Qing Department of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing100871 China Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany College of Physics Sichuan University Sichuan Chengdu610065 China Collaborative Innovation Center of Quantum Matter Beijing China

Extensive dynamical N/D calculations are made in the study of S11channel low energy πN scatterings, based on various phenomenological model inputs of left cuts at tree level. The subtleties of the singular behavior of the partial wave amplitude at the origin of the complex s plane are carefully analysed. Furthermore, it is found that the dispersion representation for the phase shift, δ, has to be modified in the case of πN scatterings. An additional contribution from the dispersion integral exists, which is, however, almost exactly cancelled the contribution from two virtual poles located near the end points of the segment cut induced by u channel nucleon exchanges. Relying very little on the details of the dynamical inputs, the subthreshold resonance N∗(890) survives. © 2021, CC0.

关键词： Dispersion (waves)

来源：评论

学校读者我要写书评

暂无评论

Diversity of states in a chiral magnet nanocylinder

arXiv

引用

arXiv 2022年

作者： Savchenko, Andrii S. Zheng, Fengshan Kiselev, Nikolai S. Yang, Luyan Rybakov, Filipp N. Blügel, Stefan Dunin-Borkowski, Rafal E. Peter Grünberg Institute Institute for Advanced Simulation Forschungszentrum Jülich and JARA Jülich52425 Germany Donetsk Institute for Physics and Engineering National Academy of Sciences of Ukraine Kyiv03028 Ukraine Ernst Ruska-Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg Institute Forschungszentrum Jülich Jülich52425 Germany Spin-X Institute School of Physics and Optoelectronics State Key Laboratory of Luminescent Materials and Devices Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional Materials South China University of Technology Guangzhou511442 China Department of Physics and Astronomy Uppsala University UppsalaSE-75120 Sweden

The diversity of three-dimensional magnetic states in an FeGe nanocylinder is studied using micromagnetic simulations and off-axis electron holography in the transmission electron microscope. In particular, we report the observation of a dipole string - a spin texture composed of two coupled Bloch points - which becomes stable under geometrical confinement. Quantitative agreement is obtained between experimental and theoretical phase shift images by taking into account the presence of a damaged layer on the surface of the nanocylinder. The theoretical model is based on the assumption that the damaged surface layer, which results from focused ion beam milling during sample preparation, has similar magnetic properties to those of an amorphous FeGe alloy. The results highlight the importance of considering the magnetic properties of the surface layers of such nanoscale samples, which influence their magnetic states. Copyright © 2022, The Authors. All rights reserved.

关键词： Germanium alloys

来源：评论

学校读者我要写书评

暂无评论

Nonlinear Control Method for Hypersonic Vehicle Based on Double Power Reaching Law of Sliding Mode

引用

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第5期35卷 849-857页

作者： Liu Rong Zhang Heng Liang Jin Key Laboratory of UAV’s Advanced Technology(Nanjing University of Aeronautics and Astronautics) Ministry of Industry and Information Technology College of Automation Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Aircraft Control Integration Technology Aviation Industry Xi’an Flight Automatic Control Research Institute

The intelligence nonlinear control scheme via double power reaching law based sliding mode control method is proposed to solve the problems of model uncertainties and unknown outside ***,the aerodynamic parameters of the morphing vehicle are replaced with curve-fitted approximation to build the accurate model for control design in the hypersonic *** the nonlinear vehicle model is transformed into the strict feedback multi-input/multi-output nonlinear system by using the input-output feedback linearization *** the same time,the disturbance observer is used to approximate the unknown disturbance,and the sliding mode method is used to solve the problem of non-matching and ***,according to the buffeting problem in sliding mode control,the double power is *** results show that the proposed method can ensure the global stability of the closed-loop system,and has good tracking and robust performance.

关键词： hypersonic vehicle disturbance observer double power sliding mode buffeting

来源：评论

学校读者我要写书评

暂无评论

Beyond the Halving Commitment: China can do more to achieve clean air for global health

引用

The Innovation 2025年

作者： Ning Kang Ruohan Wang Pengfei Li Tao Xue Jun Liu Wei Wan Jicheng Gong Shiqiu Zhang Tong Zhu Institute of Reproductive and Child Health / National Health Commission Key Laboratory of Reproductive Health and Department of Epidemiology and Biostatistics / Ministry of Education Key Laboratory of Epidemiology of Major Diseases (PKU) School of Public Health Peking University Health Science Centre Beijing 100191 China Institute of Medical Technology Peking University Beijing 100191 China Advanced Institute of Information Technology Peking University Hangzhou 311215 China State Environmental Protection Key Laboratory of Atmospheric Exposure and Health Risk Management Center for Environment and Health Peking University Beijing 100871 China School of Energy and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Clean Air Asia Beijing 100600 China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and Health Peking University Beijing 100871 China College of Environmental Sciences and Engineering Peking University Beijing 100871 China

来源：评论

学校读者我要写书评

暂无评论

Role of left-hand cut contributions on pole extractions from lattice data: Case study for Tcc(3875)+

arXiv

引用

arXiv 2023年

作者： Du, Meng-Lin Filin, Arseniy Baru, Vadim Dong, Xiang-Kun Epelbaum, Evgeny Guo, Feng-Kun Hanhart, Christoph Nefediev, Alexey Nieves, Juan Wang, Qian School of Physics University of Electronic Science and Technology of China Chengdu611731 China Institut für Theoretische Physik II Ruhr-Universität Bochum BochumD-44780 Germany CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Peng Huanwu Collaborative Center for Research and Education Beihang University Beijing100191 China Institute for Advanced Simulation Institut für Kernphysik Jülich Center for Hadron Physics Forschungszentrum Jülich JülichD-52425 Germany Jozef Stefan Institute Jamova 39 Ljubljana1000 Slovenia CeFEMA Center of Physics and Engineering of Advanced Materials Instituto Superior Técnico Avenida Rovisco Pais 1 Lisboa1049-001 Portugal Institutos de Investigación de Paterna Apartado 22085 Valencia46071 Spain Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum Matter South China Normal University Guangzhou510006 China Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing Center South China Normal University Guangzhou510006 China

We discuss recent lattice data for the Tcc(3875)+ state to stress, for the first time, a potentially strong impact of left-hand cuts from the one-pion exchange on the pole extraction for near-threshold exotic states. In particular, if the left-hand cut is located close to the two-particle threshold, which happens naturally in the DD∗ system for the pion mass exceeding its physical value, the effective-range expansion is valid only in a very limited energy range up to the cut and as such is of little use to reliably extract the poles. Then, an accurate extraction of the pole locations requires the one-pion exchange to be implemented explicitly into the scattering amplitudes. Our findings are general and potentially relevant for a wide class of hadronic near-threshold states. © 2023, CC BY.

关键词： Poles

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：