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GCMC study hydrogen adsorption on MOfs with Ab initio force field

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GCMC study hydrogen adsorption on MOFs with Ab initio force ...

On-site rapid detection of multiple pesticide residues in tea leaves by lateral flow immunoassay

第九届全国氢能学术会议

作者： J.fu,X.f.Li,L.f.zhao,H.Sun Shanghai Jiao Tong University,China

＜正＞MOfs are potential materials for hydrogen storage,but several key issues need to be solved before making this kind of materials *** order to help design new MOf materials, we developed an ab initio force *** thi...

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Journal of Pharmaceutical Analysis 2024年第2期14卷 276-283页

作者： Junxia Gao Tianyi Zhang Yihua fang Ying zhao Mei Yang Li zhao Ye Li Jun Huang Guonian Zhu Yirong Guo Institute of Pesticide and Environmental Toxicology Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang ProvinceMinistry of Agriculture Key Laboratory of Molecular Biology of Crop Pathogens and InsectsZhejiang UniversityHangzhou310058China Tea Research Institute Chinese Academy of Agricultural SciencesKey Laboratory of Tea Biology and Resources UtilizationMinistry of AgricultureHangzhou310008China Shanghai Agricultural Technology Extension Service Center Shanghai201103China School of Biological and Chemical Engineering Zhejiang University of Science and TechnologyHangzhou311200China

The application of pesticides (mostly insecticides and fungicides) during the tea-planting process will undoubtedly increase the dietary risk associated with drinking tea. Thus, it is necessary to ascertain whether pesticide residues in tea products exceed the maximum residue limits. However, the complex matrices present in tea samples comprise a major challenge in the analytical detection of pesticide residues. In this study, nine types of lateral flow immunochromatographic strips (LfICSs) were developed to detect the pesticides of interest (fenpropathrin, chlorpyrifos, imidacloprid, thiamethoxam, acetamiprid, carbendazim, chlorothalonil, pyraclostrobin, and iprodione). To reduce the interference of tea substrates on the assay sensitivity, the pretreatment conditions for tea samples, including the extraction solvent, extraction time, and purification agent, were optimized for the simultaneous detection of these pesticides. The entire testing procedure (including pretreatment and detection) could be completed within 30 min. The detected results of authentic tea samples were confirmed by ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS), which suggest that the LfICS coupled with sample rapid pretreatment can be used for on-site rapid screening of the target pesticide in tea products prior to their market release.

关键词： Lateral flow immunoassay Rapid detection Pesticide multi-residue Tea matrix Sample rapid pretreatment

Multi-timescale Modeling and Dynamic Stability Analysis for Sustainable Microgrids:State-of-the-art and Perspectives

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Protection and Control of Modern Power Systems 2024年第3期9卷 1-35页

作者： Mingyue Zhang Yang Han Yuxiang Liu Amr S.Zalhaf Ensheng zhao Karar Mahmoud Mohamed M.f.Darwish frede Blaabjerg the School of Mechanical and Electrical Engineering University of Electronic Science and Technology of ChinaChengdu 611731China IEEE 不详 the University of Electronic Science and Technology of China(UESTC) ChengduChina Aswan University the School of Electrical Engineering Aalto UniversityFinland the Department of Electrical Engineering Faculty of Engineering at ShoubraBenha University the Department of EEA School of Electrical EngineeringAalto University

The increasing trend for integrating renewable energy sources into the grid to achieve a cleaner energy system is one of the main reasons for the development of sustainable microgrid(MG)*** typical power-electronized power systems,MGs make extensive use of power electronics converters,which are highly controllable and flexible but lead to a profound impact on the dynamic performance of the whole *** with traditional large-capacity power systems,MGs are less resistant to perturbations,and various dynamic variables are coupled with each other on multiple timescales,resulting in a more complex system instability *** meet the technical and economic challenges,such as active and reactive power-sharing,voltage,and frequency deviations,and imbalances between power supply and demand,the concept of hierarchical control has been introduced into MGs,allowing systems to control and manage the high capacity of renewable energy sources and ***,as the capacity and scale of the MG system increase,along with a multi-timescale control loop design,the multi-timescale interactions in the system may become more significant,posing a serious threat to its safe and stable *** investigate the multi-timescale behaviors and instability mechanisms under dynamic inter-actions for AC MGs,existing coordinated control strategies are discussed,and the dynamic stability of the system is defined and classified in this ***,the modeling and assessment methods for the stability analysis of multi-timescale systems are also ***,an outlook and discussion of future research directions for AC MGs are also presented.

关键词： Sustainable microgrid hierarchical control modeling model simplification multi-timescale dynamic stability analysis timescale decomposition.

光纤传感器测量fRP加固结构的损伤(英文)

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力学季刊 2002年第2期23卷 196-202页

作者：赵鸣赵鸿赵阳 f.Ansari 同济大学上海房屋质量检测站 University of Illinois at Chicago ChicagoIllinois 60607-7023USA

A distributed fiber optic sensor is developed for condition monitoring of civil infrastructure sys-tems. The fiber optic sensor is especially useful in applications involving structures strengthened by fiberreinforced polymer (fRP) composites. The sensor principles are simple and therefore, practical for detec-tion of cracks, debonding and deformation measurements. Structural monitoring capability of the sensorwas evaluated through experiments with cracked reinforced concrete beams strengthened by way of CfRP(Carbon fiber Reinforced Polymer) fabrics. Sensor principle and experimental results are presented anddiscussed.

关键词：光纤传感器 fRP 加固结构损伤测量纤维增强塑料

A COMPACT EMBEDDING RESULT fOR NONLOCAL SOBOLEV SPACES AND MULTIPLICITY Of SIGN-CHANGING SOLUTIONS fOR NONLOCAL SCHRÖDINGER EQUATIONS

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Acta Mathematica Scientia 2024年第5期44卷 1853-1876页

作者： Xu ZHANG Hao ZHAI fukun zhao Department of Mathematics Wuhan University of TechnologyWuhan430070China Department of Mathematics Yunnan Normal UniversityKunming650500China

for any s∈(0,1),let the nonlocal Sobolev space X^(s)(ℝ^(N))be the linear space of Lebesgue measure functions fromℝN toℝsuch that any function u in X^(s)(ℝ^(N))belongs to L2(ℝN)and the function(x,y)\longmapsto\big(u(x)-u(y)\big)\sqrt{K(x-y)}is in L2(ℝN,ℝN).first,we show,for a coercive function V(x),the subspace E:=\bigg\{u\in X^s(\mathbb{R}^N):\int_{\mathbb{R}^N}V(x)u^2{\rm d}xfty\bigg\}of X^(s)(ℝ^(N))is embedded compactly into L^(p)(ℝ^(N))for p\in[2,2_s^*),where 2_s^*is the fractional Sobolev critical *** terms of applications,the existence of a least energy sign-changing solution and infinitely many sign-changing solutions of the nonlocal Schrödinger equation-{\cal{L}_K}u+V(x)u=f(x,u),\x\in\\mathbb{R}^N are obtained,where-{\cal{L}_K}is an integro-differential operator and V is coercive at infinity.

关键词： sign-changing solution integro-differential operator least energy variational method

DIffUSION EffECT IN THE fORMATION PROCESS Of Cr-NITRIDE UNDER N^+ IMPLANTATION

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真空科学与技术学报 1992年第Z1期23卷 103-106页

作者： Y.f.zhao S.Z.SUN Z.QIAN Z.A.ZHANG BeiJing Laboratory of Vacuum Physics Academic SinicaBeiJing 100080P.R.China Physics Department Northeast University of TechnologyShenyang 110006China

The diffusion of nitrogen atom in Cr thin film is studied. The temperature of the film under ion beam bombarding was measured by a new method and discussed theoretically. The temperature measured by means of thin film resistor gave a same level of volume. On the basis of the conservation of energy in equilibrium state, a semi-theoretical formula has been derived. The factors ion beam assisted diffusion were discussed. The result of AES analysis indicates that the arrangement of N atoms is long and smooth. HREM analysis and dynamic resistance measurement show that the Cr-nitride formed by N^+ implantation is in the near surface layers and can not grow very deep. The assemble of N was observed by means of TEM.

关键词： HREM Cr DIffUSION EffECT IN THE fORMATION PROCESS Of Cr-NITRIDE UNDER N IMPLANTATION

有战略眼光的地球化学家--解读1986年Crafoord奖获得者Claude Jean Allègre

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中国科学：地球科学 2016年第4期46卷 519-528页

作者：赵子福吴福元郑永飞中国科学技术大学地球和空间科学学院合肥230026 中国科学院地质与地球物理研究所北京100029

Allègre教授是国际著名的地球化学家,他在太阳系和行星早期演化、陨石形成、地球层圈结构与演化及其相互作用的化学地球动力学等诸多领域取得了杰出的成就,并因此于1986年获得瑞典皇家科学院颁发的Crafoord奖.他所提出的化学地球动力... 详细信息

Allègre教授是国际著名的地球化学家,他在太阳系和行星早期演化、陨石形成、地球层圈结构与演化及其相互作用的化学地球动力学等诸多领域取得了杰出的成就,并因此于1986年获得瑞典皇家科学院颁发的Crafoord奖.他所提出的化学地球动力学是当前地球化学领域最活跃、最具生命力的学科领域.目前,化学地球动力学研究已经从大洋俯冲带拓展到大陆俯冲带.Allègre教授不仅是一位杰出的科学家,也是一位热衷于科学普及的大师,还是一位有争议的政治和公众人物.他曾担任法国教育部部长,但由于要推行激进的改革而被迫下台.他曾参与中法喜马拉雅-青藏高原合作研究,是中国地学界熟悉的老朋友.本文简要介绍了Allègre教授的生平、学习和工作经历、取得的主要学术成就,希望能对中国地球科学家们有所启示.

关键词： Allègre教授 Crafoord奖地球化学家化学地球动力学

Reasonable grazing may balance the conflict between grassland utilization and soil conservation in the semi-arid hilly areas, China

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Journal of Arid Land 2024年第8期16卷 1130-1146页

作者： SUN Hui zhao Yunge GAO Liqian XU Mingxiang College of forestry Northwest A&F UniversityYangling 712100China College of Soil and Water Conservation Science and Engineering Institute of Soil and Water ConservationNorthwest A&F UniversityYangling 712100China

Soil erosion caused by unsustainable grazing is a major driver of grassland ecosystem degradation in many semi-arid hilly areas in ***,grazing exclusion is considered as an effective method for solving this issue in such ***,some ecological and economic problems,such as slow grassland rejuvenation and limited economic conditions,have become obstacles for the sustainable utilization of grassland ***,we hypothesized that the conflict between grassland use and soil conservation may be balanced by a reasonable grazing *** this study,a two-year grazing fence experiment with five grazing intensity gradients was conducted in a typical grassland of the Loess Plateau in China to evaluate the responses of vegetation characteristics and soil and water losses to grazing *** five grazing intensity gradients were 2.2,3.0,4.2,6.7,and 16.7 goats/hm2,which were represented by G1-G5,respectively,and no grazing was used as *** results showed that a reasonable grazing intensity was conducive to the sustainable utilization of grassland *** biomass under G1-G4 grazing intensity significantly increased by 51.9%,42.1%,36.9%,and 36.7%,respectively,compared with *** addition,vegetation coverage increased by 19.6%under G1 grazing *** diversity showed a single peak trend with increasing grazing *** Shannon-Wiener diversity index under G1-G4 grazing intensities significantly increased by 22.8%,22.5%,13.3%,and 8.3%,respectively,compared with ***,grazing increased the risk of soil *** with control,runoff yields under G1-G5 grazing intensities increased by 1.4,2.6,2.8,4.3,and 3.9 times,respectively,and sediment yields under G1-G5 grazing intensities were 3.0,13.0,20.8,34.3,and 37.7 times greater,respectively,than those under *** result was mainly attributed to a visible decrease in litter biomass after grazing,which decreased by 50.5%,72.6%,79.0%,80.0%

关键词： fence-controlled grazing rehabilitated grassland vegetation community characteristics soil erosion sediment biocrusts Loess Plateau

N-cycle gene abundance determination of N mineralization rate following re-afforestation in the Loess Plateau of China

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Soil Ecology Letters 2024年第1期6卷 97-106页

作者： Yaping zhao Yuqing zhao Shuohong Zhang Yulin Xu Xinhui Han Gaihe Yang Chengjie Ren College of Agronomy Northwest A&F UniversityYangling 712100China Shaanxi Engineering Research Center of Circular Agriculture College of AgronomyNorthwest A&F UniversityYangling 712100China

Afforestation effectively improved soil microbial communities and significantly increased soil nitro-gen mineralization rate(Rm).Soil microorganisms drive Rm by regulating soil N-cycling *** nitrification genes had a major effect on soil Rm than denitrification genes after *** the function of forest ecosystems requires an understanding of the mechanism of soil nitrogen ***,it remains unclear how soil N-cycling genes drive soil nitrogen mineralization during *** this study,we collected soil samples from a chrono-sequence of 14,20,30,and 45 years of Robinia pseudoacacia L.(RP14,RP20,RP30,and RP45)with a sloped farmland(fL)as a *** metagenomic sequencing analysis,we found significant changes in the diversity and composition of soil microbial communities involved in N-cycling along the afforestation time series,with afforestation effectively increasing the diversity(both alpha and beta diversity)of soil microbial *** conducted indoor culture experiments and analyzed correlations,which revealed a significant increase in both soil nitrification rate(Rn)and soil nitrogen mineralization rate(Rm)with increasing stand ***,we found a strong correlation between soil Rm and soil microbial diversity(both alpha and beta diversity)and with the abundance of soil N-cycling *** least squares path modeling(PLS-PM)analysis showed that nitrification genes(narH,narY,nxrB,narG,narZ,nxrA,hao,pmoC-amoC)and denitrification genes(norB,nosZ,nirK)had a greater direct effect on soil Rm compared to their effect on soil microbial *** results reveal the relationships between soil nitrogen mineralization rate and soil microbial communities and between the mineralization rate and functional genes involved in N-cycling,in the context of Robinia pseudoacacia *** on the Loess *** study enriches the understanding of the effects of microorganisms on soil nitrogen mineraliza

关键词： afforestation soil N mineralization rate denitrification genes nitrification genes the Loess Plateau