检索结果-南通市图书馆

Benthic foraminiferal fauna turnover at 2.1 Ma in the northern South china Sea

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2007年第6期52卷 839-843页

作者： huang baoqi {2. zhimin wang pinxian school of earth and Space {2. Peking University Beijing 100871 China Laboratory of Marine Geology Tongji University Shanghai 200092 China

Quantitative analysis of benthic foraminifera from ODP Site 1146 in the northern South china Sea (SCS) shows that abundance of Bulimina alazanensis, sometimes up to about 90%, decreased gradually since 3.2.Ma, especially at 2.1 Ma. Abundance of other benthic foraminiferal species, Globobulimina sub-globosa and Cibicidoides wuellerstorfi, increased after 2.1 Ma. Comparison with changes in oxygen and carbon isotopes of planktonic and benthic foraminifera shows that high abundance values of B. alazanensis corresponded with lower values of oxygen isotope, but for carbon isotope, high values of the species were consistent with heavier carbon isotope of benthic foraminifera and lighter carbon isotope of planktonic foraminifera, respectively, and vice versa. Considering factors such as uplift of Bashi Strait, expansion of the North Hemisphere Glaciation, strengthening of East Asian winter mon-soon and variations in oxygen and carbon isotope of foraminifera, changes of B. alazanensis in ODP Site 1146 suggest that the source of deep water masses of the northern South china Sea changed from the warm Pacific deep water with high oxygen content to Pacific Intermediate water with low oxygen content at 2.1 Ma. In addition, the strengthened East Asian winter monsoon resulted in increased pri-mary productivity, high nutrient and suboxic bottom water. Variations in species of B. alazanensis seemed to be unable to tolerate environmental stress induced by deep water masses and productivity changes.

关键词：南海北部深海海底有孔虫区系晚上新世古海洋学

An overview for monitoring and prediction of pathogenic microorganisms in the atmosphere

在线全文

学校读者我要写书评

暂无评论

Fundamental Research 2024年第3期4卷 430-441页

作者： jianping huang Danfeng {2. Yongguan Zhu Zifeng Yang Maosheng Yao Xiaoming Shi Taicheng An Qiang Zhang Cunrui huang Xinhui Bi jiang Li Zifa {2. Yongqin Liu Guibing Zhu Siyu Chen jian Hang Xinghua Qiu Weiwei Deng Huaiyu Tian Tengfei Zhang Tianmu Chen Sijin Liu Xinbo Lian Bin Chen Beidou Zhang Yingjie Zhao Rui {2. Han Li Collaborative Innovation Center for Western Ecological Safety College of Atmospheric SciencesLanzhou UniversityLanzhou 730000China Research Center for Eco-Environmental sciences Chinese Academy of SciencesBeijing 100085China National Clinical Research Center for Respiratory Disease Guangzhou Institute of Respiratory HealthFirst Affiliated Hospital of Guangzhou Medical UniversityState Key Laboratory of Respiratory Disease(Guangzhou Medical University)Guangzhou 510230China College of Environmental sciences and Engineering Peking UniversityBeijing 100871China china CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health School of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China Ministry of Education Key Laboratory for earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Vanke school of Public Health Tsinghua UniversityBeijing 100084China State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Center for Pan-third Pole Environment Lanzhou UniversityLanzhou 730000China College of Atmospheric sciences Lanzhou UniversityLanzhou 730000China school of Atmospheric sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 510640

Corona virus disease 2.19(COVID-19)has exerted a profound adverse impact on human *** have demonstrated that aerosol transmission is one of the major transmission routes of severe acute respiratory syndrome coronavirus 2.SARS-CoV-2..Pathogenic microorganisms such as SARS-CoV-2.can survive in the air and cause widespread infection among *** monitoring of pathogenic microorganism transmission in the atmosphere and accurate epidemic prediction are the frontier guarantee for preventing large-scale epidemic *** of pathogenic microorganisms in the air,especially in densely populated areas,may raise the possibility to detect viruses before people are widely infected and contain the epidemic at an earlier *** multi-scale coupled accurate epidemic prediction system can provide support for governments to analyze the epidemic situation,allocate health resources,and formulate epidemic response *** review first elaborates on the effects of the atmospheric environment on pathogenic microorganism transmission,which lays a theoretical foundation for the monitoring and prediction of epidemic ***,the monitoring technique development and the necessity of monitoring pathogenic microorganisms in the atmosphere are summarized and ***,this review introduces the major epidemic prediction methods and highlights the significance to realize a multi-scale coupled epidemic prediction system by strengthening the multidisciplinary cooperation of epidemiology,atmospheric sciences,environmental sciences,sociology,demography,*** summarizing the achievements and challenges in monitoring and prediction of pathogenic microorganism transmission in the atmosphere,this review proposes suggestions for epidemic response,namely,the establishment of an integrated monitoring and prediction platform for pathogenic microorganism transmission in the atmosphere.

关键词： Aerosol transmission Epidemic monitoring methods Epidemic prediction modelsEpidemic response Multidisciplinary cooperation

GeoChip-based microbial functions in biogeochemical cycles and their responses to environmental factors in Tengchong hot springs

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

Journal of earth Science 2024年

作者： Muhammad Inayat Ullah Khan Liuqin huang Geng Wu jian Yang Xiangyu Guan Hongchen jiang school of Environmental Studies， china {2. of Geosciences school of Ocean sciences，{2. university of Geosciences Beijing State Key Laboratory of Biogeology and Environmental Geology， china university of Geo{2.

Microorganisms actively participate in biogeochemical cycling processes and play a crucial role in maintaining the dynamic balance of hot spring ecosystems. However， the distribution of microbial functional genes and their influencing factors in hot springs remain largely unclear. Therefore， this study investigated the microbial functional genes and their potential for controlling biogeochemical cycles (C， N， S， and P) in the hot Springs of Tengchong， china， using the Geochip method， a functional gene microarray technology. The examined hot springs have very different microbial functional genes. A total of 2.736 gene probe signals were identified， belonging to 567 functional genes and associated with 15 ecological functions， mainly involving stress response， carbon cycle， nitrogen cycle， sulfur cycle， phosphorus cycle and energy processes. The amyA， narG， dsrA and ppx genes were most abundant in carbon， nitrogen， sulfur and phosphorus cycles， respectively， and were significantly correlated with pH， temperature and SO42.. The diversity and abundance of detected gene probes were negatively correlated with temperature. The α-diversity (i.e.， Shannon index) was high at low temperature and low pH. Molecular functional interactions revealed by the gene connectivity levels were negatively correlated with temperature， pH and SO42.. These results suggested that the abundance， diversity and interactions of microbial functional genes were significantly influenced by geochemical parameters?. In addition， some genera possessed functional genes related to carbon， nitrogen， sulfur， and phosphorus cycles and can synergistically control the biogeochemical cycles of carbon， nitrogen， sulfur and phosphorus. These findings provide new insights into the functional potentials of microorganisms to participate in biogeochemical cycles and their responses to environmental factors in hot springs.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

稀土离子对溶液体系中碳酸钙生成的影响

中国稀土学报 2001年第5期19卷 478-480页

作者：黄健许善锦卢景芬王夔北京大学药学院化学生物学系北京大学天然药物与仿生药物国家重点实验室北京大学天然药物与仿生药物国家重点实验室北京100083

用X射线粉末衍射、XPS光电子能谱、红外光谱以及ICP MS等技术研究不同浓度的Ce3 +,Nd3 +,Tb3 +,Gd3 +,Lu3 +对碳酸钙结晶状况的影响。稀土离子的加入有利于热力学稳定态的方解石型碳酸钙的生成 ,并且稀土离子能够部分的取代晶格中的钙离... 详细信息

用X射线粉末衍射、XPS光电子能谱、红外光谱以及ICP MS等技术研究不同浓度的Ce3 +,Nd3 +,Tb3 +,Gd3 +,Lu3 +对碳酸钙结晶状况的影响。稀土离子的加入有利于热力学稳定态的方解石型碳酸钙的生成 ,并且稀土离子能够部分的取代晶格中的钙离子 ,改变碳酸钙的结晶习性 ,在宏观上形成有序规则的排列

关键词：稀土碳酸钙方解石晶体

The 2.2. report of synergetic roadmap on carbon neutrality and clean air for china:Accelerating transition in key sectors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Environmental Science and Ecotechnology 2024年第3期19卷 4-18页

作者： Yu Lei Zhicong Yin Xi Lu Qiang Zhang Jicheng Gong Bofeng Cai Cilan Cai Qimin Chai Huopo Chen Renjie Chen Shi Chen Wenhui Chen Jing Cheng Xiyuan Chi Hancheng Dai Xiangzhao Feng Guannan Geng jianlin Hu Shan Hu Cunrui huang Tiantian Li Wei Li Xiaomei Li Jun Liu Xin Liu Zhu Liu Jinghui Ma Yue Qin Dan Tong Xuhui {2. Xuying {2. Rui Wu Qingyang Xiao Yang Xie Xiaolong Xu Tao Xue Haipeng Yu Da Zhang Ning Zhang Shaohui Zhang Shaojun Zhang Xian Zhang Xin Zhang Zengkai Zhang Bo Zheng Yixuan Zheng jian Zhou Tong Zhu Jinnan {2. Kebin He Center of Air Quality Simulation and System Analysis Chinese Academy of Environmental PlanningBeijing100041China Center for Carbon Neutrality Chinese Academy of Environmental PlanningBeijing100041China Key Laboratory of Meteorological Disaster Ministry of Education/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)Nanjing University of Information Science&TechnologyNanjing210044China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084China Ministry of Education Key Laboratory for earth System Modelling Department of Earth System ScienceTsinghua UniversityBeijing100084China State Key Joint Laboratory for Environment Simulation and Pollution Control College of Environmental Sciences and Engineering and Center for Environment and HealthPeking UniversityBeijing100871China National Center for Climate Change Strategy and International CooperationBeijing100035China Nansen-Zhu International Research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China school of Public Health Key Lab of Public Health Safety of the Ministry of Education and Key Lab of Health Technology Assessment of the Ministry of HealthFudan UniversityShanghai200032China school of Economics and Management Beijing University of Chemical TechnologyBeijing100029China Department of earth System Science University of CaliforniaIrvineCA92697USA National Meteorological Center China Meteorological AdministrationBeijing100081China College of Environmental sciences and Engineering Peking UniversityBeijing100871China Policy Research Center for Environment and Economy Ministry of Ecology and Environment of the People's Republic of ChinaBeijing100029China jiangsu Key Laboratory of Atmospheric Environment Monitoring

china is now confronting the intertwined challenges of air pollution and climate *** the high synergies between air pollution abatement and climate change mitigation,the Chinese government is actively promoting synergetic control of these two *** Synergetic Roadmap project was launched in 2.2. to track and analyze the progress of synergetic control in china by developing and monitoring key *** Synergetic Roadmap 2.2. report is the first annual update,featuring 2. indicators across five aspects:synergetic governance system and practices,progress in structural transition,air pollution and associated weather-climate interactions,sources,sinks,and mitigation pathway of atmospheric composition,and health impacts and benefits of coordinated *** to the comprehensive review presented in the 2.2. report,the Synergetic Roadmap 2.2. report places particular emphasis on progress in 2.2. with highlights on actions in key sectors and the relevant *** milestones include the proportion of non-fossil power generation capacity surpassing coal-fired capacity for the first time,a decline in the production of crude steel and cement after years of growth,and the surging penetration of electric ***,in 2.2.,china issued the first national policy that synergizes abatements of pollution and carbon emissions,marking a new era for china's pollution-carbon *** changes highlight china's efforts to reshape its energy,economic,and transportation structures to meet the demand for synergetic control and sustainable ***,the country has witnessed a slowdown in carbon emission growth,improved air quality,and increased health benefits in recent years.

关键词： Synergetic roadmap Carbon neutrality Clean air

Mobilization of Cu in the continental lower crust:A perspective from Cu isotopes

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

Geoscience Frontiers 2023年第5期14卷 17-38页

作者： Chen-Hao Luo Rui wang Yun Zhao jian {2. Noreen J.Evans State Key Laboratory of Geological Processes and Mineral Resources and Institute of Earth SciencesChina University of GeosciencesBeijing 100083China State Key Laboratory for Mineral Deposits Research School of Earth Sciences and EngineeringNanjing UniversityNanjingChina SinoProbe Laboratory of Chinese Academy of Geological sciences BeijingChina State Key Laboratory of Geological Processes and Mineral Resources School of Earth Sciences and ResourcesChina University of GeosciencesBeijing 100083China CAS Key Laboratory of Crust-Mantle Materials and Environments School of Earth and Space SciencesUniversity of Science and Technology of ChinaHefei 230026China John de Laeter Centre Curtin UniversityGPO Box U1987PerthWA 6845Australia

Recent studies have shown that Cu-rich sulfide accumulates in the lower continental crust and serves as a critical reservoir to balance Cu depletion in the upper *** of Cu in the lower crust is also assumed to be a major metal source for non-arc setting porphyry Cu *** test this hypothesis and further explore the behavior of Cu in the lower crust,we analyzed the elemental and Cu isotopic compositions of lower crustal rocks from different geological *** collected samples include hornblendites from the Kohistan arc,granulite xenoliths and hornblendites from the Gangdese arc,hornblendites and gabbros from the Laiyuan complex in the North china Craton,and hornblendite xenoliths from the western margin of the Yangtze *** lower crustal rocks have experienced varying degrees of primary or secondary sulfide accumulation,with significantly varied Cu contents(11.2.to 145 ppm)andδδ^(65)(1.05‰to 1.40‰).Petrography and geochemistry reveal varying degrees of metasomatism and fluid interaction in these rocks,and based on this,they can be further divided into three groups:Group I includes the Gangdese granulites and Yunnan hornblendites,which perhaps experienced significant *** suite of rocks shows enrichment ofδ^(65)(dδ^(65)=0.01‰to 1.40‰),positively correlated with metasomatism(dδ^(65)***/Pb).We suggest the secondary sulfides which transformed from sulfates during the interaction between lower crust and arc magma are dominant in these rocks,so the feature of heavy isotope enrichment is *** II includes Laiyuan hornblendites and gabbros,derived from the same parental magma and emplaced at different depths(hornblendites,2..3–2..1 km;gabbros 8.4–11.1 km).The Cu isotopic compositions are strongly fractionated between these two kinds of rocks,with low dδ^(65)in the hornblendites(0.00‰to 0.2.‰)and highly polarized dδ^(65)in the gabbros(1.05‰to 0.81‰).Geochemical indicators and mineral assemblages reveal that fluid intera

关键词： Cu isotope of lower continental crust Cu mobilization Metasomatism Fluid interaction Partial melting

我国省际天然气资源流调入规模分布的分形分析

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

中国矿业 2015年第12期24卷 51-55页

作者：丛殿阁林健宸陈孝劲赵奎涛叶张煌中国地质大学(北京)地球科学与资源学院北京100083 北京理工大学管理与经济学院北京100081 中国地质科学院全球矿产资源战略研究中心北京100037 北京土人咨询服务有限公司北京100083

本文运用了位次变化、齐夫定律、差异度，比较分析了2.00～2.12.我国省际天然气资源流调入规模分布的变化特征。得出以下结论：从各省历年天然气调入量位次变化看出近年来我国天然气资源流调入规模分布趋于分散，呈良性趋势发展；研究... 详细信息

本文运用了位次变化、齐夫定律、差异度，比较分析了2.00～2.12.我国省际天然气资源流调入规模分布的变化特征。得出以下结论：从各省历年天然气调入量位次变化看出近年来我国天然气资源流调入规模分布趋于分散，呈良性趋势发展；研究时段内我国省际天然气资源流调入规模结构都基本遵循齐夫法则，而且与差异度变化趋势也是一致的。这说明齐夫法则可为我国省际天然气资源流调入规模结构变化的研究提供新的定量方法。从省际天然气调入量来看，无标度区覆盖的地区范围呈扩大趋势，说明我国省际天然气调入资源量规模结构逐步得到优化。研究时段内我国省际天然气资源流调入量规模结构的空间分形演化规律不同，除了2.11年为局部单分形外，其余各年都都具有双分形结构。研究时段内我国省际天然气资源流调入量规模结构的形态发生变化，第一无标度区2.02.2.05年呈对数正态分布模式，2.06～2.08年呈帕雷托分布模式，2.09～2.12.呈对数正态分布模式。第二无标度区中各年（除2.11年）均呈不规则帕雷托分布模式。本文主要就我国省际天然气资源流的位序一规模结构的分形意义进行了讨论，对于引起我国天然气资源流动特征变化的原因和机理还有待于另行深入研究。

关键词：天然气调入位序一规模齐夫定律差异度

高寒草甸退化过程中群落生产力和物种多样性的非线性响应机制研究

在线全文

学校读者我要写书评

暂无评论

植物生态学报 2018年第1期42卷 50-65页

作者：陈宁张扬建朱军涛李军祥刘瑶杰俎佳星丛楠黄珂王荔中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态试验站北京100101 中国科学院大学北京100190 中国科学院青藏高原地球科学卓越创新中心北京100101 中国科学院大学资源与环境学院北京100190 北京大学深圳研究生院深圳518055

为了阐释青藏高原高寒草甸退化的关键生态过程,该研究依托藏北高原草地生态系统研究站(那曲站),设置不同退化梯度实验,即对照、轻度退化、中度退化、重度退化和极度退化5个梯度,探究群落生产力和物种多样性对不同退化强度的响应机制。... 详细信息

为了阐释青藏高原高寒草甸退化的关键生态过程,该研究依托藏北高原草地生态系统研究站(那曲站),设置不同退化梯度实验,即对照、轻度退化、中度退化、重度退化和极度退化5个梯度,探究群落生产力和物种多样性对不同退化强度的响应机制。结果表明:1)随着退化程度不断加剧,地上生物量呈现线性或非线性增加趋势,在重度退化处理下,地上生物量显著高于对照32.3%,其中高山嵩草(Kobresia pygmaea)地上生物量呈非线性下降趋势,而矮火绒草(Leontopodium nanum)地上生物量呈非线性增加趋势;2.与地上生物量的响应模式相反,随着退化程度加剧,地下生物量与总生物量均呈现非线性降低趋势;3)高寒草甸退化过程中,物种辛普森指数、丰富度指数、香农多样性指数和均匀度指数均呈现非线性上升趋势。结构等式方程结果表明,土壤碳含量和体积含水量与地下生物量均呈现显著的正相关关系。土壤碳含量、体积含水量和砾石质量比对地上生物量无显著影响,土壤碳、氮含量与物种多样性指数呈现显著的负相关关系。研究认为地上生产力的变化不能很好地指示草地的退化程度,建议今后研究应以可食性牧草和毒杂草等植物功能群的变化来衡量草地退化。

关键词：高寒草甸退化梯度物种多样性生产力非线性响应

In situ stress state and seismic hazard in the Dayi seismic gap of the Longmenshan thrust belt

在线全文

学校读者我要写书评

暂无评论

Science china earth {2. 2022年第7期65卷 1388-1398页

作者： Bing LI Furen XIE Jinshui huang Xiwei XU Qiliang GUO Guangwei ZHANG Junshan XU jianxin {2. Dawei jianG jian {2. Lifeng DING school of earth and Space {2. University of Science and Technology of ChinaHefei 230026China National Institute of Natural Hazards Ministry of Emergency ManagementBeijing 100085China

In the Longmenshan thrust belt,the Dayi seismic gap,an area with few earthquakes,is located between the ruptures of the 2.08 Wenchuan earthquake and the {2.3 Lushan earthquake,with a length of approximately 40–60 *** date,however,the extent of the seismic hazard of the Dayi seismic gap and whether this gap is under high stress are still hotly *** further evaluate the seismic hazard of the Dayi seismic gap with regard to stress,two boreholes(1,000 and 500 m deep)were arranged to carry out hydraulic fracturing in situ stress measurement on either side of the Shuangshi-Dachuan fault *** zone has a high seismic hazard and the capacity to undergo surface *** the analogy of this new data with stability analysis using Byerlee’s Law and existing stress measurement data collected before strong earthquakes,the results show that the area surrounding the Shuangshi-Dachuan fault zone in the Dayi seismic gap(Dachuan Town)is in a state of high in situ stress,and has the conditions necessary for friction slip,with the potential hazard of moderate to strong *** results are the first to reveal the in situ stress profile at a depth of 1,000 m in the Dayi seismic gap,and provide new data for comprehensive evaluation of the seismic hazard in this seismic gap,which is of great significance to explore the mechanism of earthquake occurrence and to help mitigate future disaster.

关键词： Dayi seismic gap Wenchuan earthquake Lushan earthquake In situ stress state Byerlee criterion Fault stability