检索结果-南通市图书馆

Current state and future perspectives of sewer networks in urban China

Frontiers of Environmental Science & Engineering 2018年第3期12卷 13-28页

作者： Dong Huang Xiuhong Liu Songzhu Jiang Hongchen wang junyan wang Yuankai Zhang School of Environment & Resource Renmin University of China Beijing 100872 China Chengdu Urban and Rural Construction Commission Chengdu 610094 China

Chinese authorities and the public have largely ignored sewer networks; however, various problems are emerging nationwide with the increase construction of new sewers. The current state of sewer network construction, administration, and maintenance in China is comprehensively reviewed in this study. Serving about 444 million people, 511,200 km of sewer lines are located in urban areas. In 2014,$7 billion was invested in sewer network construction. However, both the sewer pervasion rate and the per capita sewer length were significantly lower than those in developed countries. Sewer administrative agencies in local governments are uncoordinated. Laws, regulations, and standards are incomplete, and some practices are unscientific. The future situation of sewer maintenance is extremely grim because sewer corrosion control measures have not been launched. Moreover, inspection and rehabilitation chiefly rely on traditional approaches. In contrast, the overall market share of innovative technologies is very low owing to high cost, funds shortage, and technical limitations. Approaches such-as liner inversion cured-in-place pipe, pull-in ultraviolet light cured liners, and spiral wound lining are applied mostly in economically developed regions. According to status and problem analyses, China＇s top priority will be to conduct aggressive maintenance work in sewer networks in the future. New technical route, corrosion control - periodic visualized inspection - trenchless rehabilitation, could be the best option for future sewer maintenance in China. Instmctions and opportunities for applying this technical route are discussed in detail in this study. *** factors in the development of sewer networks in China are suggested.

关键词： Sewer network China Management Sewer corrosion Sewer inspection Trenchless rehabilitation

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

Activation-induce d bowl-shape d nitrogen and oxygen dual-doped carbon material and its excellent supercapacitance

引用

Journal of Materials Science & Technology 2023年第29期160卷 1-8页

作者： junyan wang Xinta Li Wanchun Guo Kesong Tian Jiamin Zhang Bosen Zhang Xueai Li Haiyan wang Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource Reuse State Key Laboratory of Metastable Materials Science and TechnologySchool of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004China

Porous heteroatom-doped carbon materials exhibit promising electrochemical applications because of tunable porous structure and doping heteroatom-induced charge ***,it is still a great challenge to develop porous heteroatom-doped carbon materials with both high-content active heteroatom species and facilitated diffusion ***,we report a bowl-shaped nitrogen and oxygen dual-doping carbon(N,O-doped carbon)material based on low-temperature defluorination pyrolysis and alkali-etched activation of 3-fluorophenol-3-amino-4-hydroxypyridine-formaldehyde co-condensed resin and its excellent *** low-temperature thermal treatment strategy ensures high-content pyrrolic nitrogen(4.6 at.%)and oxygen species(15.9 at.%)to avoid high-temperature treatment-induced heteroatom loss and undesired configuration *** these processes,the defluorination pyrolysis promotes the transformation from the resin to carbon material to some extent,and KOH activation also promotes the ordered arrangement of 002 planes,which together assure the appropriate conductivity of the final microporous carbon *** importantly,KOH-etched activation partially removes an un-stable nano/microscale domain of the intermediate carbon microspheres to form a unique bowl-shaped structure extremely facilitating the diffusion of the substitutes and/or electrolyte *** expected,N,O-doped carbon material displays a remarkable specific capacitance of 486.4 F g^(−1)at 1 A g^(−1)with nitro-gen/oxygen species-dependant pseudocapacitance and good electrochemical durability.

关键词： N O-doped carbon Bowl-shaped structure Low-temperature pyrolysis Alkali activation Supercapacitance

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

A solvent-free,selective liquid phase hydrogenation of nitroarenes to aniline in slurry bubble mode on porous NiMo bimetallic catalyst

引用

Chinese Journal of Chemical Engineering 2021年第5期34卷 175-180页

作者： Di Liu Pengshan Zhao Hao Zhang Minjie Liu junyan wang Guoming Zhao Qingbin Guo College of Chemical and Biological Engineering Shandong University of Science and TechnologyQingdao 266590China

NiMo bimetallic catalysts were prepared by a solid reaction *** the NiMo catalyst,the selective liquid phase hydrogenation of nitrobenzene to aniline was achieved in slurry bubble *** the high yields(98.9%)were obtained under the conditions of 80℃,solvent-free and atmospheric *** effect of Mo on the catalytic behavior of Ni based catalyst was *** characterization displayed that the inclusion of Mo could improve the specific surface area and pore volume,and the solid reaction method made metal Mo enrichment on the surface of *** two aspects should be responsible for excellent catalytic performance of NiMo *** sum,we described a simple and efficient NiMo catalyst and provided a facile and green procedure for liquid phase hydrogenation of nitrobenzene to aniline.

关键词： Catalysis Nitroarenes Hydrogenation NiMo catalyst Solid reaction Bubble column reactor

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

Quantum Griffiths singularity in two-dimensional superconducting 4Ha-TaSe_(2) nanodevices

引用

Nano Research 2023年第10期16卷 12281-12285页

作者： Ying Xing Yiyu Liu Pu Yang Jun Ge Longxin Pan junyan wang Shichao Qi Yi Liu Jian wang State Key Laboratory of Heavy Oil Processing College of New Energy and MaterialsChina University of Petroleum(Beijing)Beijing 102249China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China College of Chemistry Beijing Normal UniversityBeijing 100875China Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China Collaborative Innovation Center of Quantum Matter Beijing 100871China Hefei National Laboratory Hefei 230088China Beijing Academy of Quantum Information Sciences Beijing 100193China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

The layered transition metal dichalcogenides(TMDs)have raised considerable interest in the past decades for both fundamental physics and low-dimensional nanodevice ***,intriguing phenomena of Ising superconductivity and quantum metallic state have been reported in two-dimensional(2D)4Ha-TaSe2 ***,we report the magnetic field induced superconductor–metal transition(SMT)in mechanical exfoliated 4Ha-TaSe2 nanodevices with thickness down to 2.5 *** observe the quantum Griffiths singularity(QGS)of SMT in thin 4Ha-TaSe2 nanodevices by performing ultralow temperature transport measurements and activated scaling *** increasing the thickness of TaSe2 nanodevice to 10.6 nm,the signature of magnetoresistance crossing region can hardly be detected,revealing the thickness dependence of *** this procedure,the disorder strength plays a dominant *** work enriches the platform for studying QGS and may stimulate further investigations on the correlation between different novel quantum phenomena in the same 2D superconducting system.

关键词： two-dimensional superconductor quantum phase transition quantum Griffiths singularity transition metal dichalcogenides electrical transport property

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

Exploration and practice of general practitioner responsibility system in an urban community of Shanghai

引用

Family Medicine and Community Health 2015年第4期3卷 15-22页

作者： Yan Wu Yanping Zhao Xiaoxia Huang junyan wang Huilin Xu Hualin Su Center for Disease Control MinhangShanghai 201105China

Objective:The Minhang district of Shanghai was selected as the subject and its public health management model was ***:Minhang became a pilot location for the implementation of the general practitioner responsibility system(GPRS)in *** then,the management model of public health services in the district has gradually merged with the GPRS through a series of actions:the adjustment of organizations and the coordination mechanism in community public health services,the integration of basic public health services and clinic practice,the establishment of an informationized Internet service platform,comprehensive budgeting management of public health service programs,and performance assessment management of health ***:By the end of 2014,the number of residents who had a contractual relationship with a general practitioner(GP)in Minhang had reached 1.4367 million and all of them had family health *** with 2010,both the rate of maternal management and the rate of children management stayed at high level(≥96%),the rate of hypertension management increased(40.73%vs.28.70%),the rate of blood pressure control increased(82.13%vs.77.51%),the incidence of diabetes decreased(21.93%vs.37.85%),the rate of effective control of blood glucose for dia-betic patients increased(82.43%vs.62.77%),and the rate of child health management increased(99.79%vs.91.54%).Conclusion:The GPRS has helped to create a better community health ***-ever,the development of this system is limited by several factors,including the following:the shortage of GPs,most GPs do not have good public health service skills and a correct public health concept,unclear division of different services,and imperfect department coordination.

关键词： General practitioner Center for Disease Control Minhang Shanghai

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

Proof of Aerobically Autoxidized Self-Charge Concept Based on Single Catechol-Enriched Carbon Cathode Material

引用

Nano-Micro Letters 2024年第4期16卷 1-13页

作者： junyan wang Wanchun Guo Kesong Tian Xinta Li Xinyu wang Panhua Li Yu Zhang Bosen Zhang Biao Zhang Shuhu Liu Xueai Li Zhaopeng Xu Junjie Xu Haiyan wang Yanglong Hou State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep‑Remediation in Water and Resource ReuseSchool of Environmental and Chemical EngineeringYanshan UniversityQinhuangdao 066004People’s Republic of China Beijing Key Laboratory for Magnetoelectric Materials and Devices Beijing Innovation Centre for Engineering Science and Advanced TechnologySchool of Materials Science and EngineeringPeking UniversityBeijing 100871People’s Republic of China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People’s Republic of China Xi’an Rare Metal Materials Institute Co.Ltd Xi’an 710016People’s Republic of China

The self-charging concept has drawn considerable attention due to its excellent ability to achieve environmental energy harvesting,conversion and storage without an external power ***,most self-charging designs assembled by multiple energy harvesting,conversion and storage materials increase the energy transfer loss;the environmental energy supply is generally limited by climate and meteorological conditions,hindering the potential application of these selfpowered devices to be available at all *** on aerobic autoxidation of catechol,which is similar to the electrochemical oxidation of the catechol groups on the carbon materials under an electrical charge,we proposed an air-breathing chemical self-charge concept based on the aerobic autoxidation of catechol groups on oxygen-enriched carbon materials to ortho-quinone *** harvesting,conversion and storage functions could be integrated on a single carbon material to avoid the energy transfer loss among the different ***,the assembled Cu/oxygen-enriched carbon battery confirmed the feasibility of the air-oxidation self-charging/electrical discharging mechanism for potential *** air-breathing chemical self-charge concept could facilitate the exploration of high-efficiency sustainable air self-charging devices.

关键词： Carbon material Oxygen functionality Air oxidation self-charge

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 panel data model to predict airline passenger volume

Digital Transportation and Safety

引用

Digital Transportation and Safety 2024年第2期3卷 46-52页

作者： Xiaoting wang Junyu Cai junyan wang StarGIS(Tianjin)Technology Development Co. Ltd.Tianjin 300380China School of Automobile and Traffic Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina School of Transportation Zhenjiang CollegeZhenjiang 212028JiangsuChina

Airline passenger volume is an important reference for the implementation of aviation capacity and route adjustment *** paper explores the determinants of airline passenger volume and proposes a comprehensive panel data model for predicting ***,potential factors influencing airline passenger volume are analyzed from Geo-economic and service-related ***,the principal component analysis(PCA)is applied to identify key factors that impact the airline passenger volume of city *** the panel data model is estimated using 120 sets of data,which are a collection of observations for multiple subjects at multiple ***,the airline data from Chongqing to Shanghai,from 2003 to 2012,was used as a test case to verify the validity of the prediction *** show that railway and highway transportation assumed a certain proportion of passenger volumes,and total retail sales of consumer goods in the departure and arrival cities are significantly associated with airline passenger *** to the validity test results,the prediction accuracies of the model for 10 sets of data are all greater than 90%.The model performs better than a multivariate regression model,thus assisting airport operators decide which routes to adjust and which new routes to introduce.

关键词： Airline passenger volume Traffic prediction Panel data model Airline route decision Transportation engineering

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

负泊松比钢筋与UHPC的黏结性能

引用

哈尔滨工业大学学报 2023年第9期55卷 135-142页

作者：王俊颜常思远先进土木工程材料教育部重点实验室(同济大学) 上海201804 同济大学材料科学与工程学院上海201804

为探究负泊松比钢筋(negative Poisson's patio rebar,NPR钢筋)与超高性能混凝土(ultra high performance concrete,UHPC)的黏结性能,通过对27个拉拔试件进行中心拉拔试验,研究了UHPC种类、钢筋种类和外形、锚固长度以及保护层厚度等参... 详细信息

为探究负泊松比钢筋(negative Poisson's patio rebar,NPR钢筋)与超高性能混凝土(ultra high performance concrete,UHPC)的黏结性能,通过对27个拉拔试件进行中心拉拔试验,研究了UHPC种类、钢筋种类和外形、锚固长度以及保护层厚度等参数对NPR钢筋与UHPC间黏结性能的影响规律,并使用声发射技术对NPR钢筋与高应变强化型UHPC间的黏结滑移破坏损伤行为及破坏模式进行分析。试验结果表明:高应变强化型UHPC与NPR钢筋的黏结性能优于低应变强化型及应变软化型UHPC;随着锚固长度的增加,拉拔试验的极限荷载逐渐增加,荷载-滑移曲线趋势并未发生明显改变;保护层厚度较小时,会导致试件破坏呈现一定的脆性。NPR钢筋与高应变强化型UHPC间的黏结滑移破坏可分为初始、破坏和残余三个阶段,声发射试验可以较好地表征拉拔试验过程中基体损伤的演化进程。

关键词：负泊松比钢筋超高性能混凝土黏结性能拉拔试验声发射

来源：

维普期刊数据库博看期刊

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

超轻质水泥基复合材料基本力学性能

引用

哈尔滨工业大学学报 2018年第12期50卷 67-73页

作者：杲晓龙王俊颜先进土木工程材料教育部重点实验室(同济大学) 上海201804

为探究超轻质水泥基复合材料(ultra lightweight cement composite,ULCC)的基本力学性能及应力-应变曲线本构关系.以粉煤灰空心微珠为唯一轻质微集料,以水泥和硅灰为胶凝材料,以高效减水剂和减缩剂为外加剂,配制了钢纤维体积掺量为1%,... 详细信息

为探究超轻质水泥基复合材料(ultra lightweight cement composite,ULCC)的基本力学性能及应力-应变曲线本构关系.以粉煤灰空心微珠为唯一轻质微集料,以水泥和硅灰为胶凝材料,以高效减水剂和减缩剂为外加剂,配制了钢纤维体积掺量为1%,表观密度介于1 250~1 550 kg/m3,轴心抗压强度介于47.9~70.0 MPa的4种不同密度等级的ULCC.对其分别进行单轴抗压和单轴抗拉试验,分别研究了ULCC的轴心抗压和轴心抗拉力学性能,测得了ULCC材料轴心抗压强度、轴心抗拉强度、弹性模量、泊松比及单轴抗压和单轴抗拉应力-应变曲线.结果表明:ULCC的抗压强度、抗拉强度和弹性模量均随密度的增加而增加; ULCC的轴心抗压强度和弹性模量与密度呈较强线性相关性.轴心抗拉试验结果表明ULCC抗拉应力-应变曲线关系呈现明显的峰后平台段,ULCC材料具有良好的拉伸变形能力.根据试验测得的ULCC单轴抗压和单轴抗拉应力-应变全曲线,建立了ULCC单轴抗压和单轴抗拉的分段式应力-应变本构方程.研究成果可为ULCC结构的设计和非线性有限元计算提供理论依据.

关键词：超轻质水泥基复合材料应力-应变曲线本构关系抗压强度抗拉强度

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

日本室町时代的文化及其特色

引用

上海师范大学学报（哲学社会科学版） 2009年第3期38卷 57-65页

作者：王军彦上海师范大学外国语学院上海200234

研究和了解日本室町时代的文化对于研究现代日本文化的形成根源及其文化底流具有相当重要的意义和很大的帮助。纵观室町时代日本文化的各个领域,可以看出以下三个方面的特色。一、室町时代的文化由皇家贵族和封建武士的双重文化转向了... 详细信息

研究和了解日本室町时代的文化对于研究现代日本文化的形成根源及其文化底流具有相当重要的意义和很大的帮助。纵观室町时代日本文化的各个领域,可以看出以下三个方面的特色。一、室町时代的文化由皇家贵族和封建武士的双重文化转向了由武士主宰的一元化的文化,实现了贵族文化、武士文化和禅宗文化的融合。二、室町文化充分显示出了明显的中国宋、元、明文化的影响,是带有浓厚禅宗色彩的象征性暗示性文化。三、文化的庶民倾向和向地方的传播普及是室町文化最大的特色。

关键词：室町时代新佛教发展学问教育庶民文艺日本文化

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：