检索结果-南通市图书馆

Recent advances in bismuth-based multimetal oxide photocatalysts for hydrogen production from water splitting:Competitiveness,challenges,and future perspectives

引用

Materials Reports(Energy) 2021年第2期1卷 22-34页

作者： zheng zhu Shipeng Wan Yunxia Zhao Yaxin Gu Yaobin Wang Yong Qin Zhihui Zhang Xinlei Ge Qin Zhong Yunfei Bu Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)UNIST-NUIST Research Center of Environment and Energy(UNNU)School of Environmental Science and TechnologyNanjing University of Information Science and Technology(NUIST)210044PR China School of Chemical and Engineering Nanjing University of Science and TechnologyNanjing210094PR China Jiangsu Key Laboratory of Advanced Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu213164PR China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Changzhou UniversityChangzhou213164PR China

The efficient utilization of photocatalytic technology is essential for clean ***-based multimetal oxides(Bi_(2)WO_(6),Bi_(2)MoO_(6),BiVO_(4)and Bi_(4)Ti_(3)O_(12))have aroused widespread attention as a visible light responsive photocatalyst for hydrogen evolution due to their low cost,nontoxicity,modifiable morphology,and outstanding optical and chemical ***,the photocatalytic activities of pure materials are unsatisfactory because of their relative small specific surface area,poor quantum yield,and the rapid recombination of photogenerated ***,some modification strategies,including morphological control,semiconductor combination,doping,and defect engineering,have been systematically studied to enhance photocatalytic H_(2)evolution activity in the past few ***,we summarize the recent research progress on bismuth-based photocatalysts,pointing out the prospects,opportunities and challenges of bismuth-based ***,we aims to put forward valuable suggestions for designing of bismuth-based photocatalysts applied in hydrogen production on the premise of consolidating the existing theoretical basis of photocatalysis.

关键词： Bi_(2)WO_(6) Bi_(2)MoO_(6) BiVO_(4) Bi_(4)Ti_(3)O_(12) Morphological control Semiconductor combination Heterojunction Doping Defect Hydrogen production

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

长株潭城市群农业用地损失的动态模拟研究

引用

长江流域资源与环境 2019年第5期28卷 1142-1153页

作者：朱政朱翔湖南师范大学美术学院环境设计系湖南长沙410081 湖南师范大学资源与环境科学学院湖南长沙410081

对城市群发展过程中的农业用地损失进行动态模拟研究,有助于准确归纳其损失的趋势和机制,为农业用地保护规划的制定提供依据。以长株潭城市群为例,通过遥感影像图的收集与处理以及空间数据库、方格网系统、十二向玫瑰图和三维山丘图的构... 详细信息

对城市群发展过程中的农业用地损失进行动态模拟研究,有助于准确归纳其损失的趋势和机制,为农业用地保护规划的制定提供依据。以长株潭城市群为例,通过遥感影像图的收集与处理以及空间数据库、方格网系统、十二向玫瑰图和三维山丘图的构建,对城市群扩张和农业用地损失的过程进行动态模拟,通过离心模型归纳导致农业用地损失的动力机制,并对2020、2025年的农业用地损失情况进行预测。结果显示:城镇建成区扩张是长株潭城市群农业用地损失最主要的原因。伴随着城市群空间结构的演变,农业用地损失经历了"中心区主导—中心区与产业园区共同主导—连绵式损失"的过程。如不加以控制,至2025年,一个总面积达1 500 km^2,呈连绵状分布的超大型都市区将在长株潭城市群形成,现有中心城区、产业园区之间的农业用地将逐渐消失殆尽,从而造成难以弥补的环境损失。从空间规划上优化城市群的空间结构和发展方式,从政策法规上对侵占行为进行严格控制,是保护农业用地的关键所在。研究有望为我国城市群环境保护规划的制定提供方法论参考。

关键词：长株潭城市群农业用地损失动态模拟研究

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

Chemical transformations of arteannuin B

引用

Acta Chimica Sinica(English Edition) 1983年第1期1卷 28-36页

作者： GAI Yuan-zhu zheng Ya-ping LI Liang-quan Shanghai Institute of Materia Medica,Academia Sinica,Shanghai Shanghai Institute of Materia Medica Academia Sinica Shanghai

Using arteannuin B(2)isolated from Artemisia annua L.,a number of chemical transforma-tions have been carried out,i.e.,catalytic hydrogenation of 2 to give a mixture of 5,6 and 7,reac-tion of 6 with boron trifluoride etherate to give 8 and 9,saponification of 6 with potassium hydro-xide and deoxygenation of 2,6 and 7 with iron pentacarbonyl to give 18,4 and 3,respectively.

关键词： MS Chemical transformations of arteannuin B

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

Evidence of Positron Trapping into Defects in Zn-Doped GaAs

引用

Wuhan University Journal of Natural Sciences 2003年第04A期8卷 1103-1106页

作者： Wang zhu, zheng Zi-yao, Su Ben-fa, Hu Wei-guo School of Physics and Technology, Wuhan University , Wuhan 430072, Hubei, China School of Physics and Technology Wuhan University Wuhan Hubei China

The defect properties in as-grown and deformed p-type GaAs with different concentration of dopants and different growth method have investigated by positron lifetime measurement. The result indicates that no positron trapping was observed in LEC-grown Zn-doped p-type GaAs. However, in HB- and FZ-grown Zn-doped GaAs, positron trapping into vacancy type defects was observed. In deformed samples, clusters were formed during deformation. Positron detected shallow positron traps and the dominant shallow positron traps were attributed to Zn acceptors in Zn-doped GaAs.

关键词： positron annihilation defect semiconductor deformation p-type GaAs

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

Ammonia induces upregulation of aquaporin-4 in neocortical astrocytes of rats through the p38 mitogen-activated protein kinase pathway

引用

Chinese Medical Journal 2010年第14期123卷 1888-1892页

作者： PAN Cai-fei zhu Sheng-mei zheng Yue-ying Department of Anesthesiology First Affiliated Hospital School of Medicine Zhejiang University Hangzhou Zhejiang 310003 China

Background Astrocyte swelling is an important consequence of hepatic encephalopathy, and aquaporin-4 has been reported to play a vital role in this swelling. Ammonia causes astrocyte swelling and is also known to modulate aquaporin-4 expression in the astrocyte foot processes. The purpose of this study was to explore the mechanism of ammonia-induced aquaporin-4 expression, which has been suggested to involve the p38 mitogen-activated protein kinase pathway. Methods We exposed cultured astrocytes to ammonium chloride, an in vitro model of hepatic encephalopathy. The purity of cultured astrocytes was evaluated by fluorescent glial fibrillary acidic protein labeling; cell morphology was assessed by light microscopy; the expression of aquaporin-4, phospho-p38, and p38 were detected by Western blotting analysis. Statistical analysis was performed by one-way factorial analysis of variance, and the relationship between variables was calculated by linear regression using SPSS version 13.0 program for Windows （SPSS, Chicago, IL, USA）. Results The purity of cultured astrocytes was （96.6±1.4）%. Astrocytes swelled significantly when exposed to 5 mmol/L ammonium chloride for 24 hours as compared to non-exposed astrocytes. Co-treatment with 10 μmol/L SB203580 （an inhibitor of p38） attenuated the degree of ammonium chloride induced astrocyte swelling. Western blotting analysis revealed that the expression levels of phospho-p38 and aquaporin-4 in ammonium chloride treated cells were significantly increased relative to the control group （P 〈0.001）; SB203580 co-treatment inhibited the increased expression of phospho-p38 and aquaporin-4 relative to the ammonium chloride treated group （P=0.002 and P=0.015 respectively）. The phosphorylation of p38 and upregulation of aquaporin-4 were highly correlated （r=0.909）. There were no significant differences in total p38 expression among the groups （P=0.341）. Conclusions Ammonium chloride induced upregulation of aquaporin-4 in astrocytes is regu

关键词： ammonia aquaporin-4 astrocytes phospho-p38 mitogen-activated protein kinases

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 Simple Hybrid Recursive Learning Algorithm with High Generalization Performance for Radial Basis Function Neural Network

引用

Systems Science and Systems Engineering 2000年第1期10卷 16-27页

作者： zhu Tao,\ WANG zheng\|ou Institute of Systems Engineering, Tianjin University, Tianjin 300072, China

In this paper, we propose a simple learning algorithm for non\|linear function approximation and system modeling using minimal radial basis function neural network with high generalization performance. A hybrid algorithm is constructed, which combines recursive n \|means clustering algorithm with a simple recursive regularized least squares algorithm (SRRLS). The n \|means clustering algorithm adjusts the centers of the network, while the SRRLS constructs a parsimonious network which makes the generalization performance of the network well. The SRRLS algorithm needs no matrix computing, so it has a lower computational cost and no ill\|conditional problem. Because of the recursive manner, this algorithm is suitable for on\|line applications. The effectiveness of this algorithm is demonstrated by two benchmark examples.

关键词： radial basis function neural network generalization regularized least squares simplicity n\| means clustering recursive algorithm

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

Removal of tungsten and vanadium from molybdate solutions using ion exchange resin

引用

Transactions of Nonferrous Metals Society of China 2017年第12期27卷 2727-2732页

作者： Xian-zheng zhu Guang-sheng HUO Jie NI Qiong SONG School of Metallurgy and Environment Central South University Changsha 410083 China

The removal of tungsten(W)and vanadium(V)from molybdate solutions was studied using the poly hydroxyl chelating resin D403in batch and column *** batch experiments indicated that tungsten and vanadium could be preferentially adsorbed by the D403resin for4h in molybdate solution at a pH of *** factors,αVMo andαWMo,wereabove45and18,respectively,when the molar ratios of Mo/V and Mo/W in the solution *** tests illustrated that vanadium and tungsten could be easily eluted from the resin with1mol/L sodium hydroxide solution in *** further explore the sorption mechanism of the resin,the experimental equilibrium isotherm data of the three metals fitted well with the Freundlich *** column experiments confirmed the adaptability of the D403resin in the production of sodium molybdate with a removal rate of tungsten surpassing90%and that of vanadium of99.4%.

关键词： tungsten vanadium removal ion exchange molybdate

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

Relationship between symptoms and weight-bearing radiographic parameters of idiopathic flexible flatfoot in children

引用

Chinese Medical Journal 2013年第11期126卷 2029-2033页

作者： YAN Gui-sen YANG zheng LU Ming ZHANG Jian-li zhu zheng-hua GUO Yuan Department of Pediatric Orthopaedics Beijing Jishuitan Hospitalthe Fourth Clinical Medical College of Peking University Beijing100035 China

Background Idiopathic flexible flatfoot in children most frequently improves with age and remains asymptomatic. It is a physiological variation of the normality that does not require treatment unless it becomes symptomatic. The aim of this research was to investigate the reason why some individuals with flexible flatfoot become symptomatic by analysis of the differences in the relative alignment of each segment of the foot between symptomatic and asymptomatic patients with idiopathic flexible flatfoot using radiographic measurements. Methods One hundred patients with idiopathic flexible flatfoot were retrospectively identified and divided into two groups： asymptomatic （n=50） and symptomatic （n=50）. Standing anteroposterior and lateral radiographs of the foot were analyzed. Five measurements were calculated to describe the alignment of the foot. An independent-samples t-test and Logistic regression test were used for statistical analysis. Results Age and sex were similar in the two groups. The independent-samples test revealed significant differences in two parameters： the anteroposterior talonavicular coverage angle and the lateral talo-first metatarsal angle. When the Logistic regression test was performed, only the talonavicular coverage angle showed statistical significance. Conclusions The lateral displacement of the navicular bone, measured by the anteroposterior talonavicular coverage angle, seems to be related to the onset of symptoms. In individuals with otherwise normal flexible flatfoot, an increase in this angle might be an important risk factor for developing symptoms.

关键词： flexible flatfoot radiographic analysis symptomatic flatfoot children

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

技术治理嵌入“干部国家”:基层社会治理的二元结构

引用

学习与探索 2020年第9期 54-61页

作者：朱政湖北民族大学法学院湖北恩施445000

在当下中国基层治理中,技术治理构成制度体系和制度执行能力的核心要素,它将社会治理视为科学技术问题,运用科学技术工具、方法进行政策法律执行和公共事务管理。在中国共产党和中华人民共和国长历史的观照下,基层治理正在经历技术治理... 详细信息

在当下中国基层治理中,技术治理构成制度体系和制度执行能力的核心要素,它将社会治理视为科学技术问题,运用科学技术工具、方法进行政策法律执行和公共事务管理。在中国共产党和中华人民共和国长历史的观照下,基层治理正在经历技术治理嵌入“干部国家”的总体转型,并形成一个二元的治理结构,亦即以技术应对复杂治理和精准治理的要求,而党政干部则构成基层政权的权力框架和象征性权威符号。技术治理的进化遵循其内在逻辑:技术工具有自我拓展的特性,能够因应新时代的治理需求和制度环境变迁。但是,技术治理在显著提升治理绩效的同时,也产生了新的问题,需要通过实践正确认识和有效化解。

关键词：基层社会治理技术治理 “干部国家” 二元结构

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

“双高合作”——突破STEM教育瓶颈的有效尝试

引用

中国电化教育 2018年第11期 54-58,125页

作者：朱征南京大学教育研究院江苏南京210093

该文分析了我国中小学STEM教育发展面临的缺少打通学段的整体设计、社会联动机制不够健全、师资队伍整体水平不高的现状,借鉴美国中小学STEM教育中的中学大学衔接、联邦政府主导、校内校外合作等经验做法,结合南京外国语学校高中学生走... 详细信息

该文分析了我国中小学STEM教育发展面临的缺少打通学段的整体设计、社会联动机制不够健全、师资队伍整体水平不高的现状,借鉴美国中小学STEM教育中的中学大学衔接、联邦政府主导、校内校外合作等经验做法,结合南京外国语学校高中学生走进高校以拓展中学教育资源、高校教授走进高中以弥补中学师资短板、高中高校科研合作以创新联合培养模式等实践做法,提出"双高"(高中高校)合作共创STEM教育的新路径。

关键词： STEM教育社会资源高中高校合作

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：