检索结果-南通市图书馆

The adsorption effect of aquaculture residual feed on heavy metals and its impact on microbial metabolism of feed

Ecological Processes 2024年第2期 246-259页

作者： Sufeng Wang Zijng Wang Wen Zhang jingshan li Mingyang lin li Chen State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse Yanshan University Key Laboratory of Pollution Exposure and Health Intervention of Zhejiang Province College of Biology and Environmental EngineeringZhejiang Shuren University Hebei Ocean & Fisheries Science Research Institute

Background Intensive and large-scale aquaculture has a high biological density, and a large amount of artificial feed must be provided. As a result, residual feed would be discharged into natural water bodies with water exchange. Due to heavy metal pollution in surface water, residual feed may adsorb heavy metals in the water, affecting the subsequent microbial degradation of feed and the restoration of the water environment. The combined ecological impacts of these two types of pollution urgently need to be *** This study explored the adsorption effect of residual feed on heavy metals and its impact on microbial degradation of residual feed. The results showed that both the insoluble component（mainly fiber, ash, and ether extract, abbreviated as FAE） and soluble component（soluble protein and starch） of the feed had adsorption effects on heavy metals. As the salinity increased, the adsorption capacity of Cu2+and Cd2+decreased, while the adsorption effect on Pb2+was not changed significantly. The adsorption of heavy metals by residual feed could affect the biological degradation of residual feed. The residual feed could adsorb heavy metals and bacterial cells simultaneously, forming FAE-B（bacteria）-S（starch）-Pr（protein）-metal adsorption complex. This adsorption effect could reduce the negative impact of heavy metals on microbial degradation of residual feed. The simulated degradation experiments in actual water bodies also confirmed this. However, the accumulation of heavy metals in residual feed may bring negative effects, such as being consumed by aquatic organisms and entering the food *** The results of this study provide a basis for the collection and centralized treatment of residual feed in aquaculture, as well as the control and remediation of residual feed pollution in natural water bodies.

关键词：

来源：博看期刊

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

论波浪纹刻槽盆与王湾三期文化

引用

华夏考古 2024年第1期 66-76页

作者：李景山山东大学历史文化学院山东济南市250100

波浪纹刻槽盆是一种内壁靠近口沿处有波浪形刻槽的陶器,虽然数量不多但特色鲜明,主要流行于王湾三期文化,其兴衰过程也与王湾三期文化的崛起、扩张、消亡相呼应,可视为王湾三期文化典型性器物。波浪纹刻槽盆分布范围的变迁也为这一时期... 详细信息

波浪纹刻槽盆是一种内壁靠近口沿处有波浪形刻槽的陶器,虽然数量不多但特色鲜明,主要流行于王湾三期文化,其兴衰过程也与王湾三期文化的崛起、扩张、消亡相呼应,可视为王湾三期文化典型性器物。波浪纹刻槽盆分布范围的变迁也为这一时期考古学文化之间交流传播提供了佐证,特别是其在鄂东地区的出现,是王湾三期文化东线通道南下的有力证明。

关键词：波浪纹刻槽盆刻槽盆王湾三期文化

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

Carbon dots anchored NiAl-LDH@In_(2)O_(3) hierarchical nanotubes for promoting selective CO_(2) photoreduction into CH_(4)

引用

Chinese Chemical Letters 2024年第6期35卷 404-408页

作者： Xiuzheng Deng Changhai liu Xiaotong Yan jingshan Fan Qian liang Zhongyu li Advanced Catalysis and Green Manufacturing Collaborative Innovation Center CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China School of Materials Science&Engineering Changzhou UniversityChangzhou 213164China

The efficient conversion of CO_(2) into hydrocarbon fuels(CH_(4))with high selectivity is considered as a great challenge in photocatalysis owing to the multiple-electron transfer pathway and competitive H_(2) ***,we developed carbon dots(CDs)-modulated S-scheme heterojunction of CDs/NiAl-LDH@In_(2)O_(3)(C-DH@IN)through a facile in-situ hydrothermal *** to the multi-shell nanotube structure,the C-DH@IN shows an enhanced CH_(4) evolution rate of 10.67μmol h^(-1)g^(-1)and higher selectivity of CH_(4)(85.70%)compared with In_(2)O_(3) and Ni Al-LDH@In_(2)O_(3) binary catalyst in the pure water without sacrificial *** spin resonance(ESR)and in situ Fourier transform infrared spectra verify that the constructed S-scheme heterojunction can possess the strong redox capability and the HCOOand CH_(3)O-as critical intermediates play an important role in selective CO_(2) reduction to generate CH_(4).Furthermore,CDs with superior photoabsorption can boost the electron transfer and absorb H^(+),thus improving the integration of H^(+)and CO_(2) ***,this work emphasizes a facile strategy to achieve efficient CO_(2)-to-CH_(4) conversion based on construction of CDs-based heterojunction catalysts.

关键词： Carbon dots In_(2)O_(3) Layered double hydroxides Photocatalytic CO_(2) reduction S-scheme

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

浅析新砦期与新砦文化

引用

中国国家博物馆馆刊 2023年第11期 6-14页

作者：李景山山东大学历史文化学院济南250100

新砦类遗存对于把握龙山—二里头发展脉络、深化早期夏文化认识等方面具有重要意义。目前学界对这类遗存的认识尚显不足,甚至基础概念方面仍有多种歧见。关于这类遗存主要有“新砦期”和“新砦文化”两种称谓,这两种称谓的提出均为弥补... 详细信息

新砦类遗存对于把握龙山—二里头发展脉络、深化早期夏文化认识等方面具有重要意义。目前学界对这类遗存的认识尚显不足,甚至基础概念方面仍有多种歧见。关于这类遗存主要有“新砦期”和“新砦文化”两种称谓,这两种称谓的提出均为弥补河南龙山文化和二里头文化之间的断层,但两者所指代的内容并不相同,如不进行区分则无法厘清这类遗存的文化内涵。鉴此可将新砦期定义为王湾三期文化向二里头文化转变过程中所有过渡性文化遗存的总称,新砦文化定义为以新砦遗址二、三期为代表的一类特殊遗存,是龙山晚期局部质变的产物。围绕两者的诸多争论,多数与夏文化研究相关,两者均为早期夏文化研究的重要组成部分。

关键词：新砦期新砦文化新砦遗址早期夏文化

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

基于方向相位一致性的多源光学遥感图像匹配方法

引用

遥感信息 2022年第4期37卷 29-35页

作者：程玉芳李景山中国科学院空天信息创新研究院北京100094 中国科学院大学北京100094

针对多源遥感图像间往往具有较大的辐射差异和几何畸变等问题,提出了一种基于相位一致性模型和方向相位一致性特征的匹配方法。首先,利用相位一致性模型提取边缘图像进行分块相位相关,记录脉冲峰位置从而得到图像间的空间几何约束;然后... 详细信息

针对多源遥感图像间往往具有较大的辐射差异和几何畸变等问题,提出了一种基于相位一致性模型和方向相位一致性特征的匹配方法。首先,利用相位一致性模型提取边缘图像进行分块相位相关,记录脉冲峰位置从而得到图像间的空间几何约束;然后,利用方向相位一致性描述模板区域特征,该特征具有良好的抗辐射畸变能力;最后,根据几何约束条件预测同名点位置,进行特征匹配。实验结果表明,该方法能够克服异源图像间较大的几何误差和非线性辐射差异,实现图像间的自动匹配。

关键词：多源遥感图像匹配相位一致性相位相关空间几何约束特征匹配

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

Parameter determination to calculate water environmental capacity in Zhangweinan Canal Sub-basin in China

引用

Journal of Environmental Sciences 2010年第6期22卷 904-907页

作者： Yingxia li ,Ruzhi Qiu,Zhifeng Yang,Chunhui li,jingshan Yu State Key Laboratory of Water Environment Simulation,School of Environment,Beijing Normal University,Beijing,100875,China. State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

Zhangweinan canal sub-basin （ZWN） has the most serious water resource shortage and water pollution problems in north of China. To calculate the water environmental capacity in ZWN, determination methods for design flow rates and degradation coefficients were discussed in this study. Results showed that 90% and 50% hydrological guarantee flow rates were suitable to be the design flow rates for rainy and dry seasons, respectively. Degradation coefficients of CODMn and NH3-N were 0.25 day^-1 and 0.15 day^-1 for branch streams and 0.5 day^-1 and 0.25 day^-1 for mainstreams, respectively in ZWN. With one-dimensional water quality simulation model, water environmental capacities were calculated to be 82,139 tons/yr for CODMn and 2394 tons/yr for NH3-N in ZWN.

关键词： degradation coefficient design flow rate water environmental capacity Zhangweinan

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

A Networking Platform Construction of "Leadership Science" Course

A Networking Platform Construction of "Leadership Science" C...

引用

2013教育技术与信息系统国际会议

作者： jingshan li Shengyu Ma School of Humanities and Social Sciences Heilongjiang University of Science and Technology

In order to develop students’ organization and leadership ability to improve the overall quality, shaping their perfect personality, it is very necessary to open "Leadership Science" course and use network resources in teaching. By studying the networking construction advantages of "Leadership Science" course in-depth, the basic module settings of course networking platform and basic strategies to promote the platform construction are proposed, to provide a reference for "Leadership Science" course system construction in the future. Course Networking platform construction can reasonable and effective use multimedia network technology to teaching, so that the learners transfer passive learning into active inquiry in the learning process, cultivating students’ innovative spirit and ability to solve problems independently, to adapt the requirements of information age.

关键词： "Leadership Science" Course Networking Construction.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Robust Face Recognition Based on Non-negative Sparse Discriminative Low-rank Representation

Robust Face Recognition Based on Non-negative Sparse Discrim...

引用

第30届中国控制与决策会议

作者： Xielian Hou Caikou Chen Shengwei Zhou jingshan li College of Information Engineering Yangzhou University

Due to occlusion or camouflage existing in the current face images,previous face recognition algorithms such as sparse representation classification algorithm do not take face damage into consideration during the training period,and therefore their testing performance will be *** this paper,we propose a novel non-negative sparse discriminative low-rank representation algorithm（NSDLRR）.First,we seek a sparse,low-rank and non-negative matrix in training ***,we add a structural inconsistency constraint on this basis,make different kinds of samples as independent as possible,thereby increasing the extra recognition ***,the test samples are classified by sparse linear *** results on different face database show that the algorithm has better performance.

关键词： Low-rank representation Sparse representation Structural inconsistency

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Lunar surface dielectric constant,regolith thickness, and ~3He abundance distributions retrieved from the microwave brightness temperatures of CE-1 Lunar Microwave Sounder

引用

Science China Earth Sciences 2010年第9期53卷 1365-1378页

作者： WANG ZhenZhan1, li Yun1,2, JIANG jingshan1 & li DiHui1 1 National Microwave Remote Sensing Laboratory, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China National Microwave Remote Sensing Laboratory Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China

Lunar regolith parameters, such as physical temperature, thickness and dielectric constant, are important in studying regolith features, distribution of lunar resources and evolution of the Moon. There had been no measurement obtained by lunar-orbit-borne microwave radiometer applied to evaluate the properties of lunar regolith before CE-1 Lunar Microwave Sounder (CELMS) being launched. CEMLS is the first passive microwave radiometer in the world to sound the surface of the Moon. The brightness temperatures (TB) sensed by CELMS include complicated information on the above geophysical parameters. In this paper, algorithms of retrieving dielectric constant, regolith thickness, and 3He content from CELMS brightness temperatures are developed, and the results are compared with those from literature. The results show that the regolith thicknesses are mostly in the range of 4.0-6.0 m, and 43% of them are bigger than 5.0 m. The content of 3He evaluated by retrieved regolith thickness is about 1.03 million tons.

关键词： CE-1 Lunar Microwave Sounder (CELMS) lunar regolith dielectric constant lunar regolith thickness 3He retrieval

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

政府产业基金对企业创新的影响机制研究——政治关联视角

引用

科技进步与对策 2024年第7期41卷 91-100页

作者：李宇辰郝项超刘精山中国农业银行博士后科研工作站北京100005 中国人民大学博士后科研流动站北京100872 南开大学经济学院天津300071 渤海证券股份有限公司天津300081

政府产业基金对我国中小企业创新的促进作用受到学界与企业界的广泛关注,在创新型国家建设过程中发挥着重要作用。不同于以往研究,基于手工构建的政府产业基金数据库并结合我国实际情况,从政治关联视角实证分析政府产业基金对企业创新... 详细信息

政府产业基金对我国中小企业创新的促进作用受到学界与企业界的广泛关注,在创新型国家建设过程中发挥着重要作用。不同于以往研究,基于手工构建的政府产业基金数据库并结合我国实际情况,从政治关联视角实证分析政府产业基金对企业创新的影响机制。结果发现,政府产业基金通过投资与企业形成的天然政治关联能够降低企业法律诉讼风险,形成正式产权保护制度替代机制。同时,这种政治关联可为企业生产经营活动提供资源,改善企业经营状况、缓解企业现金流压力,形成弥补融资缺口的替代机制。政府产业基金通过上述两种机制促进企业创新。结论可为政府产业基金对企业发展的作用机制研究提供新的解释,揭示在发展中国家发展政府产业基金的必要性。

关键词：政府产业基金政治关联诉讼风险经营资源企业创新

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：