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13卷 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： Residual feed Adsorption complex Feed pollution Heavy metal

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

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

爆炸恐怖袭击情景下地铁车站应急疏散模拟研究

引用

山西建筑 2024年第19期50卷 127-132页

作者：李景山郭佳荟郑州警察学院河南郑州450053

以X市C地铁车站为例,利用pathfinder软件对该车站遭受爆炸袭击时人员应急疏散进行仿真,研究发现:在发生爆炸袭击突发事件时,当爆炸发生于站台中部,疏散时间为191 s,全部乘客可以应急疏散至安全区域;袭击发生于站台层南部,可疏散楼梯为... 详细信息

以X市C地铁车站为例,利用pathfinder软件对该车站遭受爆炸袭击时人员应急疏散进行仿真,研究发现:在发生爆炸袭击突发事件时,当爆炸发生于站台中部,疏散时间为191 s,全部乘客可以应急疏散至安全区域;袭击发生于站台层南部,可疏散楼梯为中部与北部楼梯时,疏散完成时间为242.78 s,表明该地铁站发生爆炸袭击事件时建筑结构的改变严重影响人员疏散;改变应急疏散人员数量,截面人流最大为1200人,疏散完成时间为231.78 s,说明人流量的增加会使应急疏散变得更加困难,但人流量的影响小于爆炸袭击对地铁站内建筑结构的改变;增加工作人员对乘客进行分区分流疏散引导后,疏散完成时间为161.78 s,疏散完成所需时间最少,说明地铁车站工作人员应急处置能力是保证应急疏散的重要因素。

关键词：地铁车站爆炸袭击应急疏散仿真模拟

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

氮掺杂碳纳米纤维负载NiCo-LDH纳米片用于超级电容器

引用

上海纺织科技 2024年第10期52卷 44-50页

作者：李净珊徐洋洋叶仪鹏董梦娇李秉芯陈昊天中原工学院纺织服装产业研究院河南郑州450007 中原工学院国际教育学院河南郑州450007

利用静电纺丝法和高温碳化法制备了氮掺杂碳纳米纤维(NCNF),通过水热合成反应法在NCNF表面原位生长镍钴层状双氢氧化物(NiCo-LDH)纳米片,制备出核壳结构的NiCo-LDH/NCNF复合材料。对样品的形貌和结构进行表征,并对复合材料进行电化学性... 详细信息

利用静电纺丝法和高温碳化法制备了氮掺杂碳纳米纤维(NCNF),通过水热合成反应法在NCNF表面原位生长镍钴层状双氢氧化物(NiCo-LDH)纳米片,制备出核壳结构的NiCo-LDH/NCNF复合材料。对样品的形貌和结构进行表征,并对复合材料进行电化学性能测试。结果显示:NiCo-LDH/NCNF在1、10 A/g的电流密度下,比电容可达2822.9、2178.8 F/g,电容保持率高达77.2%;在连续充放电循环6000次后,电容保持率仍可达到91.8%,循环稳定性能优异。以NiCo-LDH/NCNF为正极,活性炭(AC)为负极组装的非对称超级电容器(NiCo-LDH/NCNF//AC)在1 A/g电流密度下,比电容为226.1 F/g,在742.1 W/kg功率密度下,能量密度高达69.2 Wh/kg。表明NiCo-LDH/NCNF复合材料是一种极具潜力的能量转换与存储材料。

关键词：静电纺丝氮掺杂碳纳米纤维镍钴层状双氢氧化物纳米片超级电容器电化学性能

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

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

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

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

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：