检索结果-南通市图书馆

Water quality assessment of benthic diatom communities for water quality in the subalpine karstic lakes of Jiuzhaigou,a world heritage site in China

引用

Journal of Mountain Science 2016年第9期13卷 1632-1644页

作者： OUyang Li-li pan yang-dong HUANG Cheng-min TANG Ya DU Jie XIAO Wei-yang Department of Environmental Science and Engineering Sichuan UniversityChengdu 610065China Department of Environmental Science and Management Portland State UniversityPortlandOR 97207USA Jiuzhaigou Administrative Bureau Jiuzhaigou County 623400China Chengdu Academy of Environmental Sciences Chengdu 610072China.

Jiuzhaigou, characterized by its magnificent waterscapes and subalpine karstic features, is both a World Heritage Site and a World Biosphere Reserve in southwestern China. In recent years, this unique ecosystem has shown signs of stress due to increasing tourism activities within the reserve. The various routine methods, which monitor physical and chemical properties, do not fully reflect water quality in the subalpine and alpine lakes, while the indicators using aquatic organisms to evaluate the water quality or status of the subalpine lakes are poorly reported. Thus, in this study, benthic diatoms from multiple habitats in Jiuzhaigou were sampled and assessed for water quality monitoring. Canonical Correspondence Analysis （CCA） showed that the canonical coefficients for elevation, water temperature and total nitrogen on the first Canonical Corresnondence Analysis axis were -0.84. 0.78 and -0.53, respectively, environmental variables associated with the distribution patterns of benthic diatoms. The dominance of diatom taxa indicative of nutrient enrichment indicates a clear trend toward eutrophication in the Pearl Shoal and Colorful Lake, two of the sites mostly visited by tourists. It was observed that the effect of the type of substratum on diatom community composition is not significant in subalpine lakes. The most dominant species in Jiuzhaigou lakes are the genera Achnanthes, Fragilaria, CymbeUa, Cocconeis, Diatoma and Denticula. In combination with dominant and sensitive species in the benthic diatom communities, CCA and CA methods can be used to evaluate the impact of human activities on subalpine karstic lakes. The dominance of diatom taxa is indicative of nutrient enrichment and the results of CCA and CA indicate a clear trend toward eutrophication in the Pearl Shoal and Colorful Lake, two of the sites mostly visited by tourists.

关键词： Subalpine karstic lakes Water quality Benthic diatoms Community composition Canonicalcorrespondence analysis

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

Differential Structure and Characteristics of a New-Type Silicon Magnetic Sensitivity Transistor

引用

Chinese Physics Letters 2013年第8期30卷 205-208页

作者： ZHAO Xiao-Feng WEN Dian-Zhong pan dong-yang GUAN Han-Yu LV Mei-Wei LI Lei Key Laboratory of Electronics Engineering Heilongjiang UniversityHarbin 150080

A differential structure magnetic sensor is *** is comprised of two new-type silicon magnetic sensitivity transistors(SMSTs)with similar characteristics and has a common emitter,two bases and two *** sensor is fabricated by micro electromechanical system technology on ahigh resistivity silicon *** room temperature,when supply voltage VDD=10.0 V,all the base currents Ib1 of SMST1 and Ib2 of SMST2 equal 6.0 mA,the absolute magnetic sensitivity for the two SMSTs are 46.8 mV/kG and 56.1 mV/kG,respectively,and the absolute magnetic sensitivity for the sensor is 102.9 mV/***,the temperature coefficientαV of the collector output voltage of the sensor is 0.044%/℃.The experimental results show that the magnetic sensitivity and the temperature characteristics of the sensor can be improved and ameliorated compared with a single SMST.

关键词： SMS absolute characteristics

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

Small modifications of endo-functionalized cavities lead to large changes in molecular interaction in water

引用

Science China Chemistry 2025年第1期68卷 369-376页

作者： Song-Meng Wang Hao Nian Yan-Fang Wang Li-Shuo Zheng Yu-Tao Zheng Yi-Wei dong Liping Huang Xiaoping Wang Wei Jiang Liu-pan yang Department of Chemistry Southern University of Science and Technology School of Chemistry and Pharmaceutical Sciences State Key Laboratory for Chemistry and Molecular Engineering of Medicinal ResourcesGuangxi Normal University School of Pharmaceutical Science Hengyang Medical School University of South China

Studying molecular recognition in aqueous environments is crucial for understanding biological processes. Herein, we present a series of N-doped endo-functionalized anthracene-based cavities by introducing inward-directed pyridine units. The subtle modifications can significantly affect the binding properties of these receptors, which is similar to the mutations in biological systems. Combining theoretical calculations and molecular recognition experiments demonstrated that these “mutations” have an impact on the hydrophobicity and charge distribution of the hosts, consequently significantly influencing molecular *** is crucial for understanding the intricate mechanisms of molecular-level interactions in biological receptors.

关键词： host-guest interaction hydrophobic effect endo-functionalized cavity mutation pyridine

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Deciphering the role of mtH2O2 in hepatic ischemia-reperfusion injury mechanisms with low-background super-resolution fluorogenic probe

引用

Science China Chemistry 2025年第1期68卷 297-307页

作者： Bin Fang Limin Wang Haoqin Li Jiaxin Zhang yang Ding pan pan Li Bo Peng Hua Bai Lin Li Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials &Engineering Northwestern Polytechnical University Institute of Flexible Electronics (IFE Future Technologies) Xiamen University

Hepatic ischemia-reperfusion injury（HIRI） is characterized by mitochondrial dysfunction and oxidative stress. Monitoring mitochondrial hydrogen peroxide（mtH2O2） levels in real-time through super-resolution imaging is crucial for elucidating its distribution in live cells and its mechanism of action during HIRI. However, low-background fluorogenic probes have been overlooked in the context of super-resolution imaging. In this study, we developed a low-background fluorogenic probe（MitoWG） with the potential for super-resolution morphology-correlated mitochondrial identification to track the fluctuates of mtH2O2in HIRI. Activation of the desirable fluorescence properties of the probe by mtH2O2was confirmed using structural illumination microscopy（SIM）, enabling high-quality mitochondrial imaging with exceptional specificity and *** in mtH2O2levels were successfully observed in both cellular and rat models of HIRI. Furthermore, we associated the decline in mitochondrial redox homeostasis with accelerated mtH2O2production during HIRI, which triggered mitophagy deficiency and led to cell death. In conclusion, Mito-WG possesses excellent photophysical and low-background properties for SIM imaging, making it a promising tool for mtH2O2tracking in HIRI research and clinical diagnosis.

关键词： hepatic ischemia-reperfusion injury low-background mtH2O2-activatable super-resolution imaging fluorogenic probe

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国经济绿色转型中的金融市场失灵问题与干预机制研究

引用

中央财经大学学报 2015年第11期 29-34页

作者：王遥潘冬阳中央财经大学财经研究院北京财经研究基地中央财经大学金融学院

经济的绿色发展需要大量资金支持,而由于金融市场失灵的存在,中国经济绿色转型中的资金需求无法依靠现有条件下自发的市场活动得以满足,绿色金融领域存在一系列问题,亟需必要的金融类干预机制加以解决,以实现中国经济的绿色发展目标。... 详细信息

经济的绿色发展需要大量资金支持,而由于金融市场失灵的存在,中国经济绿色转型中的资金需求无法依靠现有条件下自发的市场活动得以满足,绿色金融领域存在一系列问题,亟需必要的金融类干预机制加以解决,以实现中国经济的绿色发展目标。笔者在前人针对市场失灵、政府干预、绿色金融等研究的基础上,梳理了经济绿色转型过程中的金融市场失灵现象及相关投融资壁垒,阐述了针对金融市场失灵采取干预措施的作用,并创新性地提出在我国现阶段可行的干预机制及政策建议,这主要是:构建我国绿色银行体系、双重目标下激发社会资本挤入效应、建立多层次的贷款风险分担和补偿机制、出台绿色信贷资本监管优惠政策、通过发行绿色债券支持企业直接融资。

关键词：经济绿色转型金融市场失灵干预机制

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

Defect Engineering:Can it Mitigate Strong Coulomb Effect of Mg^(2+)in Cathode Materials for Rechargeable Magnesium Batteries?

引用

Nano-Micro Letters 2025年第1期17卷 135-159页

作者： Zhengqing Fan Ruimin Li Xin Zhang Wanyu Zhao Zhenghui pan Xiaowei yang School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China School of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024People’s Republic of China School of Materials Science and Engineering Tongji UniversityShanghai 201804People’s Republic of China

Rechargeable magnesium batteries(RMBs)have been considered a promising“post lithium-ion battery”system to meet the rapidly increasing demand of the emerging electric vehicle and grid energy storage ***,the sluggish diffusion kinetics of bivalent Mg^(2+)in the host material,related to the strong Coulomb effect between Mg^(2+)and host anion lattices,hinders their further development toward practical *** engineering,regarded as an effective strategy to break through the slow migration puzzle,has been validated in various cathode materials for *** this review,we first thoroughly understand the intrinsic mechanism of Mg^(2+)diffusion in cathode materials,from which the key factors affecting ion diffusion are further ***,the positive effects of purposely introduced defects,including vacancy and doping,and the corresponding strategies for introducing various defects are *** applications of defect engineering in cathode materials for RMBs with advanced electrochemical properties are also ***,the existing challenges and future perspectives of defect engineering in cathode materials for the overall high-performance RMBs are described.

关键词： Rechargeable magnesium battery Sluggish diffusion kinetic Defect engineering Cathode materials Ion migration

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

县域减贫效率测度及空间差异分析——基于贵州省的实证研究

引用

统计与信息论坛 2019年第1期34卷 101-108页

作者：潘东阳洪名勇中国农业大学人文与发展学院北京100193 贵州大学管理学院贵州贵阳550025

基于2012年与2015年贵州省县域经济发展的截面数据,运用三阶段DEA对贵州省县域减贫效率进行了测度,并通过探索性数据分析(ESDA)对其空间差异进行了分析。结果表明:运用三阶段DEA模型剔除管理无效率、随机误差、环境变量等因素的影响后,... 详细信息

基于2012年与2015年贵州省县域经济发展的截面数据,运用三阶段DEA对贵州省县域减贫效率进行了测度,并通过探索性数据分析(ESDA)对其空间差异进行了分析。结果表明:运用三阶段DEA模型剔除管理无效率、随机误差、环境变量等因素的影响后,贵州省县域减贫效率得到了提高,使用环境变量与随机误差项对原始投入值进行调整具有合理性;贵州省县域减贫效率呈现出明显的下降趋势,纯技术效率下降是造成贵州省县域减贫效率降低的主要原因;县域减贫综合技术效率存在明显的空间自相关特征,HH型和LL型的县域单元具有明显的聚集特征,研究期内空间范围也发生了显著变化;县域综合减贫效率呈现出黔东北、黔西南高,黔中、黔西南低的空间格局。从综合减贫效率的冷、热点格局变化来看,黔东北、黔西、黔中的减贫效率在下降,而黔东南的减贫效率在提高。

关键词：三阶段DEA 效率减贫空间

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

照料孙子女对农村中老年人医疗服务利用的影响

引用

人口与发展 2021年第2期27卷 39-51页

作者：潘东阳刘晓昀中国农业大学人文与发展学院北京100083

利用2015年中国健康与养老追踪调查(charts)数据,采用内生转换Probit模型实证检验了照料孙子女对农村中老年医疗服务利用的影响。研究发现:农村中老年照料孙子女具有一定的选择性,性别、婚姻、年龄、日常行为能力、孙子女数量对农村中... 详细信息

利用2015年中国健康与养老追踪调查(charts)数据,采用内生转换Probit模型实证检验了照料孙子女对农村中老年医疗服务利用的影响。研究发现:农村中老年照料孙子女具有一定的选择性,性别、婚姻、年龄、日常行为能力、孙子女数量对农村中老年的照料决策存在显著影响。照料孙子女给农村中老年人带来了额外的医疗负担,分别使门诊服务利用和住院服务利用发生的概率提高了6.0%和3.7%。异质性估计结果发现,照料孙子女对女性门诊服务利用的影响大于男性,但对住院服务利用的影响小于男性;照料孙子女对低龄中老年门诊服务利用的影响大于高龄中老年,但对住院服务的利用的影响小于高龄中老年。照料孙子女增加了农村中老年人的健康损失和子女的经济支持,从而引起其医疗服务利用的增加。

关键词：照料孙子女中老年人医疗服务利用

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

HNRNPC as a pan-cancer biomarker and therapeutic target involved in tumor progression and immune regulation

引用

Oncology Research 2025年第1期33卷 83-102页

作者： YUEZHOU ZHANG ZHAO ZHANG JINXIN dong CHANGAN LIU Department of Hepatobiliary Surgery The Second Affiliated Hospital of Chongqing Medical UniversityChongqing400016China Department of Hepatobiliary Surgery The First Affiliated Hospital of Chongqing Medical UniversityChongqing400016China

Background:Aberrant expression of RNA-binding proteins(RBPs)has been linked to a variety of diseases,including hematological disorders,cardiovascular diseases,and multiple types of *** nuclear ribonucleoprotein C(HNRNPC),a member belonging to the heterogeneous nuclear ribonucleoprotein(hnRNP)family,plays a pivotal role in nucleic acid *** studies have underscored the significance of HNRNPC in tumorigenesis;however,its specific role in malignant tumor progression remains inadequately ***:We leveraged publicly available databases,including The Cancer Genome Atlas(TCGA),to explore the potential involvement of HNRNPC across various ***,we performed experimental validation studies focused on liver ***:Our analysis revealed that HNRNPC is overexpressed in a wide range of common malignancies,including liver and lung cancers,and is strongly linked to unfavorable ***,HNRNPC was observed to be closely linked to tumor *** immune checkpoint analysis and immune cell infiltration assessment,HNRNPC emerged as a potential target for modulating tumor ***,silencing of HNRNPC markedly inhibited the proliferation,metastasis,and infiltration of liver cancer ***:In summary,our findings highlight HNRNPC as a prognostic marker in various cancers,including liver cancer,and suggest its involvement in shaping the tumor immune *** insights offer potential avenues for improving clinical outcomes in tumors with elevated HNRNPC expression,particularly through immunotherapeutic strategies.

关键词： Heterogeneous nuclear ribonucleoprotein C(HNRNPC) pan-cancer analysis Tumor immunity Prognostic biomarker Immunotherapeutic target Hepatocellular carcinoma

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

Tribo-piezoelectric hybrid nanogenerator based on temporary solution template process

引用

Science China Technological Sciences 2025年

作者： Jinxian ZHANG Peng pan Zhengchun yang Jie HE Peifeng ZENG College of Integrated Circuit Science and Engineering Tianjin University of Technology

In this study, a friction piezoelectric hybrid nanogenerator （HNG） with a sponge-like structure was developed. A novel temporary solution template process was proposed to create smaller, uniformly distributed pores within the sponge structure, allowing for the complete volatilization of the porous agent without causing structural defects. The output voltage of the porous HNG structure was nearly twice that of its solid structure, demonstrating superior electrical output performance. A peak-to-peak open circuit voltage of 168 V, a short circuit current density of 36.41μA cm-2, and a maximum power density of 32 W m-2were obtained at a load resistance of 200 MΩby periodically compressing an HNG with a dimension of 0.8 cm×0.8 cm. The generated electricity was sufficient to directly illuminate 180 tandem white LEDs and power small electronic devices. In addition, this study shows that the HNG could detect electrical signals from different parts of the human body during movement, suggesting significant potential for applications in energy harvesting and motion sensing.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

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：