检索结果-南通市图书馆

Changes in Global Vegetation Distribution and Carbon Fluxes in Response to Global Warming:Simulated Results from IAP-DGVM in CAS-ESM2

引用

Advances in Atmospheric Sciences 2022年第8期39卷 1285-1298,I0002-I0010页

作者： Xiaofei GAO Jiawen ZHU Xiaodong ZENG Minghua ZHANG Yongjiu DAI Duoying JI He zhang International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China School of Marine and Atmospheric Sciences Stony Brook UniversityNY 11790USA School of Atmospheric Sciences Sun Yat-Sen UniversityGuangzhou 510275China College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China

Terrestrial ecosystems are an important part of Earth systems,and they are undergoing remarkable changes in response to global warming.This study investigates the response of the terrestrial vegetation distribution and carbon fluxes to global warming by using the new dynamic global vegetation model in the second version of the Chinese Academy of Sciences(CAS)Earth System Model(CAS-ESM2).We conducted two sets of simulations,a present-day simulation and a future simulation,which were forced by the present-day climate during 1981-2000 and the future climate during 2081-2100,respectively,as derived from RCP8.5 outputs in CMIP5.CO_(2)concentration is kept constant in all simulations to isolate CO_(2)-fertilization effects.The results show an overall increase in vegetation coverage in response to global warming,which is the net result of the greening in the mid-high latitudes and the browning in the tropics.The results also show an enhancement in carbon fluxes in response to global warming,including gross primary productivity,net primary productivity,and autotrophic respiration.We found that the changes in vegetation coverage were significantly correlated with changes in surface air temperature,reflecting the dominant role of temperature,while the changes in carbon fluxes were caused by the combined effects of leaf area index,temperature,and precipitation.This study applies the CAS-ESM2 to investigate the response of terrestrial ecosystems to climate warming.Even though the interpretation of the results is limited by isolating CO_(2)-fertilization effects,this application is still beneficial for adding to our understanding of vegetation processes and to further improve upon model parameterizations.

关键词： global warming vegetation distribution carbon flux leaf area index surface air temperature

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chiral porphyrin assemblies

聚集体(英文)

引用

聚集体(英文) 2023年第1期4卷 27-40页

作者： Li zhang TianyuWang Jianzhuang Jiang minghua Liu Beijing National Laboratory for Molecular Science(BNLMS) CAS Key Laboratory of ColloidInterface and Chemical ThermodynamicsInstitute of ChemistryChinese Academy of SciencesBeijingP.R.China Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of ChemistryUniversity of Science and Technology BeijingBeijingP.R.China

Porphyrins are among the most important macrocycles because they perform many essential functions in living systems and serve as building blocks in many functional materials.Incorporating the chirality into porphyrins can aid biomimetic research and the exploration of new functional materials.In this review,recent developments in chiral porphyrin assemblies are highlighted.The review is mainly divided into two sections:the different strategies for constructing chiral porphyrin assemblies and the applications.The formation of chiral porphyrin assemblies can be from porphyrin molecules substituted with chiral groups;achiral porphyrins induced by chiral additives and spontaneous deracemizations of achiral porphyrins during the assemblies.We also provide an overview of the applications of chiral porphyrin assemblies in chiral sensing,asymmetry catalysis,circularly polarized luminescence,and so on.The further challenge in the field is discussed.

关键词： chiral circularly polarized luminescence helical porphyrins self-assembly

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carrier-Free Deferoxamine Nanoparticles against Iron Overload in Brain

引用

CCS Chemistry 2023年第1期5卷 257-270页

作者： Fang Zhu Jian Zhong Junfei Hu Peng Yang Jianhua zhang Minghua ZHANG Yiwen Li Zhipeng Gu College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengduSichuan 610065 State Key Laboratory of Biotherapy and Cancer West China HospitalSichuan University and Collaborative Innovation CenterChengdu 610041

Although considerable progress has been achieved in treating iron-overload diseases with deferoxamine(DFO)-based biomaterials,high DFO loading and multifunctional integration in one system are still grand challenges.Herein,a series of carrier-free,high DFO-loading(∼80%),uniform spherical nanoparticles(NPs)assisted by polyphenols have been facilely developed with both efficient iron and reactive oxygen species-scavenging properties.Interestingly,those DFO-based NPs have demonstrated excellent scavenging performance in iron-overloaded cell model and energetically exhibited brain cell protection in vivo in intracerebral hemorrhage animal models.This study could provide a promising strategy to significantly improve the curative effect of DFO delivery systems for iron-overload diseases.

关键词： carrier-free deferoxamine nanoparticles iron scavenging reactive oxygen species scavenging

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAS-ESM2.0 Successfully Reproduces Historical Atmospheric CO_(2) in a Coupled Carbon−Climate Simulation

引用

Advances in Atmospheric Sciences 2024年第4期41卷 572-580页

作者： Jiawen ZHU Juanxiong HE Duoying JI Yangchun LI He zhang Minghua ZHANG Xiaodong ZENG Kece FEI Jiangbo JIN International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD) Nanjing University of Information Science&TechnologyNanjing 210044China College of Global Change and Earth System Science Beijing Normal UniversityBeijing 100875China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029China School of Marine and Atmospheric Sciences Stony Brook UniversityNY 11790USA University of Chinese Academy of Sciences Beijing 100049China

The atmospheric carbon dioxide(CO_(2))concentration has been increasing rapidly since the Industrial Revolution,which has led to unequivocal global warming and crucial environmental change.It is extremely important to investigate the interactions among atmospheric CO_(2),the physical climate system,and the carbon cycle of the underlying surface for a better understanding of the Earth system.Earth system models are widely used to investigate these interactions via coupled carbon-climate simulations.The Chinese Academy of Sciences Earth System Model version 2(CAS-ESM2.0)has successfully fixed a two-way coupling of atmospheric CO_(2)with the climate and carbon cycle on land and in the ocean.Using CAS-ESM2.0,we conducted a coupled carbon-climate simulation by following the CMIP6 proposal of a historical emissions-driven experiment.This paper examines the modeled CO_(2)by comparison with observed CO_(2)at the sites of Mauna Loa and Barrow,and the Greenhouse Gases Observing Satellite(GOSAT)CO_(2)product.The results showed that CAS-ESM2.0 agrees very well with observations in reproducing the increasing trend of annual CO_(2)during the period 1850-2014,and in capturing the seasonal cycle of CO_(2)at the two baseline sites,as well as over northern high latitudes.These agreements illustrate a good ability of CAS-ESM2.0 in simulating carbon-climate interactions,even though uncertainties remain in the processes involved.This paper reports an important stage of the development of CAS-ESM with the coupling of carbon and climate,which will provide significant scientific support for climate research and China’s goal of carbon neutrality.

关键词： CAS-ESM atmospheric CO_(2) coupled carbon-climate simulation emissions-driven CMIP6 experiment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Agricultural pesticide use and food safety:California's model

引用

Journal of Integrative Agriculture 2015年第11期14卷 2340-2357页

作者： Minghua ZHANG Michael R Zeiss Shu Geng Department of Land Air and Water ResourcesUniversity of California California Department of Pesticide Regulation Sino-US Joint Food Safety Research Center Northwest A&F University Department of Plant Sciences University of California

Pesticides have been an essential part of agriculture to protect crops and livestock from pest infestations and yield reduction for many decades. Despite their usefulness, pesticides could pose potential risks to food safety and the environment as well as human health. This paper reviews the positive benefits of agricultural pesticide use as well as some potential negative impacts on the environment and food safety. In addition, using the case of California, we discuss the need for both residue monitoring and effective pest management to promote food safety. Twenty years＇ pesticide residue data from California＇s pesticide residue monitoring program were analyzed. Results showed that more than 95% of food samples were in compliance with US pesticide residue standards （tolerances）. However, certain commodities from certain sources had high percentages of residues above tolerance levels. Even when residues above tolerance levels were detected, most were at levels well below 1 mg kg^-1, and most posed negligible acute health risk. However, a few detected residues had the potential to cause health effects. Therefore, establishing an effective food residue monitoring program is important to ensure food quality throughout the marketplace.

关键词： food safety food security pesticide use residue monitoring environmental impacts IPM tolerances maximum residue limits （MRLs）

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

FeMo@porous carbon derived from MIL-53(Fe)@MoO_(3) as excellent heterogeneous electro-Fenton catalyst: Co-catalysis of Mo

引用

Journal of Environmental Sciences 2023年第5期127卷 652-666页

作者： Xuedong Du Wenyang Fu Pei Su Qizhan zhang minghua Zhou Key Laboratory of Pollution Process and Environmental Criteria Ministry of EducationCollege of Environmental Science and EngineeringNankai UniversityTianjin 300350China Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution Nankai UniversityTianjin 300350China Tianjin Advanced Water Treatment Technology International Joint Research Center College of Environmental Science and EngineeringNankai UniversityTianjin 300350China

An ultra-efficient electro-Fenton catalyst with porous carbon coated Fe-Mo metal(FeMo@PC),was prepared by calcining MIL-53(Fe)@MoO_(3).This FeMo@PC-2 exhibited impressive catalytic performance for sulfamethazine(SMT)degradation with a high turnover frequency value(7.89 L/(g·min)),much better than most of reported catalysts.The mineralization current efficiency and electric energy consumption were 83.2%and 0.03 kWh/gTOC,respectively,at lowcurrent(5mA)and small dosage of catalyst(25.0mg/L).The removal rate of heterogeneous electro-Fenton(Hetero-EF)process catalyzed by FeMo@PC-2 was 4.58 times that of Fe@PC/Hetero-EF process.Because the internal-micro-electrolysis occurred between PC and Fe0,while the co-catalysis of Mo accelerated the rate-limiting step of the Fe^(3+)/Fe^(2+) cycle and greatly improved the H_(2)O_(2)utilization efficiency.The results of radical scavenger experiments and electron paramagnetic resonance confirmed the main role of surface-bound hydroxyl radical oxidation.This process was feasible to remove diverse organic contaminants such as phenol,2,4-dichlorophenoxyacetic acid,carbamazepine and SMT.This paper enlightened the importance of the doped Mo,which could greatly improve the activity of the iron-carbon heterogeneous catalyst derived from metal-organic frameworks in EF process for efficient removal of organic contaminants.

关键词： Metal-organic frameworks derivatives Fe-Mo bimetal Porous carbon Co-catalysis Heterogeneous electro-Fenton

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

IAP-AGCM对QBO模拟的动量收支分析

引用

Atmospheric and Oceanic Science Letters 2021年第3期14卷 1-6页

作者： Zhaoyang Chai Minghua ZHANG Qingcun Zeng Jinbo Xie Ting You He zhang International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary Science University of Chinese Academy of SciencesBeijingChina School of Marine and Atmospheric Sciences State University of New York at Stony BrookNYUSA State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

平流层准两年振荡(QBO)是赤道平流层(~100–1 hPa)变率的主要模态,可对中高纬地区的环流产生重要影响,但目前利用通用大气环流模式(GCM)对其进行准确模拟仍然是一个挑战.本文利用IAP大气环流模式(IAP-AGCM)的中高层大气模式版本(IAP-AGC... 详细信息

平流层准两年振荡(QBO)是赤道平流层(~100–1 hPa)变率的主要模态,可对中高纬地区的环流产生重要影响,但目前利用通用大气环流模式(GCM)对其进行准确模拟仍然是一个挑战.本文利用IAP大气环流模式(IAP-AGCM)的中高层大气模式版本(IAP-AGCML69)对QBO进行模拟,并对其动量收支情况进行分析.研究发现,QBO主要是由对流活动引起的重力波强迫(参数化)引起的,但该动量强迫被平流层赤道上升流所引起的平流过程显著削弱.模式可分辨尺度的波动强迫对赤道上空的QBO的总纬向风倾向有正贡献,在上平流层,其量值大小与参数化的重力波强迫相当.以上结果提供了对QBO形成机制以及模式模拟差异可能原因的认识.

关键词：平流层准两年振荡重力波动量收支纬向风

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Gates joint locally connected network for accurate and robust reconstruction in optical molecular tomography

引用

Journal of Innovative Optical Health Sciences 2024年第3期17卷 11-22页

作者： minghua Zhao Yahui Xiao Jiaqi zhang Xin Cao Lin Wang School of Computer Science and Engineering Xi’an University of TechnologyXi’anChina School of Information Science and Technology Northwest UniversityXi’an 710127China

Optical molecular tomography(OMT)is a potential pre-clinical molecular imaging technique with applications in a variety of biomedical areas,which can provide non-invasive quantitative three-dimensional(3D)information regarding tumor distribution in living animals.The construction of optical transmission models and the application of reconstruction algorithms in traditional model-based reconstruction processes have affected the reconstruction results,resulting in problems such as low accuracy,poor robustness,and long-time consumption.Here,a gates joint locally connected network(GLCN)method is proposed by establishing the mapping relationship between the inside source distribution and the photon density on surface directly,thus avoiding the extra time consumption caused by iteration and the reconstruction errors caused by model inaccuracy.Moreover,gates module was composed of the concatenation and multiplication operators of three different gates.It was embedded into the network aiming at remembering input surface photon density over a period and allowing the network to capture neurons connected to the true source selectively by controlling three different gates.To evaluate the performance of the proposed method,numerical simulations were conducted,whose results demonstrated good performance in terms of reconstruction positioning accuracy and robustness.

关键词： Optical molecular tomography gates module positioning accuracy robustness

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

THEORETICAL ANALYSIS ON THE NUCLEATION OF MICRO-DAMAGE IN CEMENT MORTAR UNDER COMPRESSIVE LOADING AND SULFATE ATTACK

引用

Acta Mechanica Solida Sinica 2013年第1期26卷 53-61页

作者： Jiankang Chen Hui Song Minghua ZHANG Jian Ye The Faculty of Mechanical Engineering and Mechanics Ningbo University State Key Laboratory of Turbulence and Complex Systems Jiangsu Provincial Water Resources Department

Effect of uniaxial compression on the nucleation of micro-damage in cement mortar under sulfate attack is investigated. Shape and size of micro-voids in cement mortar is detected using Micro Computed Tomography techniques. The formation of delayed ettringite crystal is analyzed using scanning electron microscope and energy disperse spectrum methods. Deformation of micro-voids and the distribution of stress at the surface of a micro-void are calculated. It is found that the nucleation of micro-cracks is caused by the tensile stress at the voids＇ surface, and such damage nucleation will be speeded up by the remote uniaxial compressive load.

关键词： sulfate attack uniaxial compression micro-damage cement mortar Eshelby＇smethod

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

中高层大气环流模式的初步评估与敏感性分析

引用

Atmospheric and Oceanic Science Letters 2021年第2期14卷 35-41页

作者： Zhaoyang Chai Minghua ZHANG Qingcun Zeng He zhang Jiangbo Jin Jinbo Xie Ting You International Center for Clinate and Eirvironment Scences Irstute of Atmospheric PhysiecsChinese Academy of SsclencesBeling China College of Earth anrd Planetary Science Uintiversity of Chinese Academy of SciencesBeijingChina School of Marire and Atmospheric Scierces State University of New York at Stony BrookNYUSA State Key Laboratory of Nunerical Modeling for Atmospherie Seciences and Geophysical Fuid Dynanics Inte of Atmosphere PhysicsChinese hcademy of ScienceBeijingChina Center for Monsoon Systen Research Instinute of Atmospheric PhysicsChinese Academy of SciencesBeijing China

提高大气环流模式的模式顶层高度对中高层大气(如平流层准两年振荡)的准确模拟至关重要.本研究将IAP大气环流模型(IAP-AGCM)延伸至中层大气顶(~0.01 hPa,~80 km)并提高垂直方向分辨率(91层),发展了一个中高层大气环流模型(IAP-AGCML91)... 详细信息

提高大气环流模式的模式顶层高度对中高层大气(如平流层准两年振荡)的准确模拟至关重要.本研究将IAP大气环流模型(IAP-AGCM)延伸至中层大气顶(~0.01 hPa,~80 km)并提高垂直方向分辨率(91层),发展了一个中高层大气环流模型(IAP-AGCML91).结果表明,与低层模式相比,该中高层大气模式在整体上显著减小了平流层尤其是上平流层的冷偏差.研究发现这种改善与两种机制有关:与低层模式相比,高层模式模拟的短波加热更大,极区平流层附近的经向涡动热通量更大.上述结果表明,垂直分辨率和模式顶层高度对IAP-AGCML91的气候模拟有重要影响.

关键词： IAP-AGCM 中层大气平流层辐射加热瞬变涡动热通量

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

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

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

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：