检索结果-南通市图书馆

考虑建成环境特征的城市轨交公交换乘效率评价

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

铁道科学与工程学报 2023年第4期20卷 1242-1249页

作者：施榆吉管雪玲阎倬藩江苏大学汽车与交通工程学院江苏镇江212013

精准地进行城市轨交公交换乘服务水平评价分析是探索和推进城市轨交公交两网融合、一体化发展的重要前提。基于从全样本刷卡数据筛选出的具有实际换乘需求的轨交站点,以周边的建成环境特征为聚类指标采用k-means方法划分轨交站点类别。... 详细信息

精准地进行城市轨交公交换乘服务水平评价分析是探索和推进城市轨交公交两网融合、一体化发展的重要前提。基于从全样本刷卡数据筛选出的具有实际换乘需求的轨交站点,以周边的建成环境特征为聚类指标采用k-means方法划分轨交站点类别。基于此,综合考虑实际换乘需求和目的地站点吸引力时变性,构建动态换乘服务缺口指标,解析不同类别轨交站点换乘效率时空分布差异性。以上海市中心城区为例,进行模型的有效性验证。研究结果表明:上海市中心城区范围内轨交公交换乘效率具有时变性特征:表现为平峰时段的平均换乘效率低于高峰时段,换乘沙漠的小时尺度空间移动趋势为由市区中部逐渐向外延伸,并向北部集中。轨交站点周边建成环境对轨交公交换乘效率时变性特征存在影响:商务办公型与娱乐休闲型站点在高峰时段的平均换乘效率高于平峰时段,居住型与职住结合型站点在下午平峰与晚高峰时段的平均换乘效率优于早高峰与夜间平峰时段。针对换乘沙漠站点,商务办公型换乘沙漠站点的平均换乘效率最优,其次为娱乐休闲型与职住结合型换乘沙漠站点,居住型换乘沙漠站点的平均换乘效率最差。研究结果为城市轨交公交换乘服务能力评价提供了新的思路和方法,可有效指导轨交公交衔接不畅、换乘不便管理问题的解决,对构建绿色、和谐、可持续的城市交通系统具有现实指导意义。

关键词：城市轨交公交换乘效率建成环境特征动态换乘服务缺口

纳米氧化钛复合改性提升聚醚酰亚胺真空沿面闪络特性的物理机制分析

在线全文

学校读者我要写书评

暂无评论

中国电机工程学报 2024年第14期44卷 5810-5820,I0032页

作者：曾嘉凯李倬凡张妍刘霞杨柳青刘文凤迟晓红程璐电力设备电气绝缘国家重点实验室(西安交通大学) 陕西省西安市710049

聚醚酰亚胺是重要的航天器用绝缘材料。提升聚醚酰亚胺的沿面绝缘性能并探究沿面闪络的物理机制具有重要意义。该研究通过纳米氧化钛复合改性有效地将聚醚酰亚胺的真空沿面闪络电压提高19.25%。通过表征纳米复合前后材料的表面形貌、表... 详细信息

聚醚酰亚胺是重要的航天器用绝缘材料。提升聚醚酰亚胺的沿面绝缘性能并探究沿面闪络的物理机制具有重要意义。该研究通过纳米氧化钛复合改性有效地将聚醚酰亚胺的真空沿面闪络电压提高19.25%。通过表征纳米复合前后材料的表面形貌、表面释气和表面电荷输运特性发现,表面气体吸附量随着TiO_(2)含量的升高而增大,而深陷阱能级和表面电阻率与闪络电压呈正相关关系。分析认为,纳米复合改性后气体吸附特性变化不足以影响真空沿面闪络。纳米复合改性提高真空沿面闪络电压的根本原因在于适量的TiO_(2)能提高材料的表面电阻率和深陷阱能级,二者的提高阻碍电极处电荷的注入和表面电子发射,进而造成电子倍增过程受阻。当电子倍增过程受阻时,介质表面需要更大的能量去释放更多的内部溶解气体或使介质分解产生更多气体以便碰撞电离形成足够强度的电子崩,因此沿面闪络电压有所提升。

关键词：聚醚酰亚胺纳米复合真空闪络表面陷阱表面释气

Manipulating the ionic nanophase of Nafion by in-situ precise hybridization with polymer quantum dot towards highly enhanced fuel cell performances

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Nano Research 2022年第5期15卷 4124-4131页

作者： Wenjia Wu zhuofan Zhou yan Wang Yatao Zhang Yong Wang Jingtao Wang Yecheng Zou School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450003China State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 211816China State Key Laboratory of Fluorinated Functional Membrane Materials Shandong DongYue Polymer Material Co.Ltd.Zibo 256400China

Hierarchical-structure materials hold great promise for numerous applied domains such as fuel cell,sensor,and ***,the developments are significantly impeded by the lack of efficient strategy permitting precise and efficient decoration of specific confined ***,an in-situ precise hybridization strategy is proposed to efficiently manipulate the nanostructure of membrane ***,Nafion ionic nanochannels are impregnated with precursors via heat swelling,followed by microwave-assisted condensation to form polymer quantum dot *** formation of polymer quantum dot network significantly improves the stability and functionality of ionic nanophase(i.e.,ionic nanochannel).This helps hybrid membrane achieving enhanced proton conduction and methanol barrier properties,resulting in over ten times increase in proton/methanol *** then impart prominent device performances for both hydrogen and methanol fuel cells with the elevation of~100%.Importantly,such function manipulation of ionic nanochannels is achieved with fully maintaining function of backbone ***,the regulation of physical topology and chemical environment of ionic nanochannel also brings optimization of gas and ion separation *** facile and versatile strategy may open up a new avenue for decorating confined space of many hierarchical-structure materials.

关键词： nanophase-separated membrane in-situ precise hybridization polymer quantum dot nanophase decoration performance enhancement

Nafion-threaded MOF laminar membrane with efficient and stable transfer channels towards highly enhanced proton conduction

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

Nano Research 2022年第4期15卷 3195-3203页

作者： yan Wang Hexiang Gao Wenjia Wu zhuofan Zhou Zhiwei yang Jingtao Wang Yecheng Zou School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450003China Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China State Key Laboratory of Fluorinated Functional Membrane Materials Shandong DongYue Polymer Material Co.LtdZibo 256400China

Porous laminar membranes hold great promise to realize ultrafast ion transfer if efficient and stable transfer channels are constructed in vertical ***,metal-organic framework(MOF)nanosheets bearing imidazole molecules in the pores were designed as building blocks to assemble free-standing MOF laminar ***,Nafion chains were threaded into the pores induced by electrostatic attraction from imidazole molecules by slowly filtering dilute Nafion *** demonstrate that the threaded Nafion chains lock adjacent MOF nanosheets,affording highly enhanced structural stability to the resultant laminar membrane with almost no water ***,abundant acid-base pairs are formed in the pores along Nafion chains,working as efficient,continuous conduction pathways in vertical *** conductivities as high as 110 and 46 mS·cm^(-1)are obtained by this membrane under 100%and 40%relative humidity(RH),respectively,which are two orders of magnitude higher than that of pristine MOF *** conductivity under low humidity(40%RH)is even over 2 times higher than that of commercial Nafion membrane,generating the maximum power density of 1,100 mW·cm^(-2)in hydrogen fuel cell(vs.291 mW·cm^(-2)of Nafion membrane).Besides,the influence of water state on proton transfer in confined space is investigated in detail.

关键词： MOF nanosheet Nafion-threaded MOF laminar membrane structural stability proton conductivity hydrogen fuel cell

传统孝文化精髓融入我国现代家庭养老路径探析

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

湖北工程学院学报 2024年第4期44卷 16-22页

作者：高布权李卓凡延安大学政法与公共管理学院陕西延安716000

传统孝文化精髓对现代家庭养老有着极为重要的作用。然而,由于家庭孝道失范、学校重智轻孝、社会孝风不佳以及政府孝法缺位等因素的制约,传统孝文化精髓融入现代家庭养老效果不佳,从而导致我国部分家庭子女缺乏对传统孝文化精髓的理论... 详细信息

传统孝文化精髓对现代家庭养老有着极为重要的作用。然而,由于家庭孝道失范、学校重智轻孝、社会孝风不佳以及政府孝法缺位等因素的制约,传统孝文化精髓融入现代家庭养老效果不佳,从而导致我国部分家庭子女缺乏对传统孝文化精髓的理论认知、情感认定、意志认可以及行为认同。为此,必须通过营造孝慈家风氛围、挖掘孝德育人元素、培育孝亲社会风气、推进孝道制度建设等多种路径,促进传统孝文化精髓融入现代家庭养老。

关键词：现代家庭养老传统孝文化精髓人口老龄化

Dietary supplementation with xylooligosaccharides and exogenous enzyme improves milk production,energy utilization efficiency and reduces enteric methane emissions of Jersey cows

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Animal Science and Biotechnology 2023年第6期14卷 2514-2524页

作者： Lifeng Dong Lei Zhao Bowei Li yanhua Gao Tianhai yan Peter Lund zhuofan Liu Qiyu Diao Institute of Feed Research/Sino‑US Joint Lab On Nutrition and Metabolism of Ruminant Chinese Academy of Agricultural SciencesBeijing 100081China. School of Agriculture Ningxia UniversityYinchuan 750000China. College of Life Science and Technology Southwest Minzu UniversityChengdu 610041China. Agri-Food and Biosciences Institute Hillsborough Co.Down BT 266DRUK. Department of Animal Science Aarhus UniversityAU FoulumPO Box 508830 TjeleDenmark.

Background Sustainable strategies for enteric methane(CH_(4))mitigation of dairy cows have been extensively explored to improve production performance and alleviate environmental *** present study aimed to investigate the effects of dietary xylooligosaccharides(XOS)and exogenous enzyme(EXE)supplementation on milk production,nutrient digestibility,enteric CH_(4) emissions,energy utilization efficiency of lactating Jersey dairy ***-eight lactating cows were randomly assigned to one of 4 treatments:(1)control diet(CON),(2)CON with 25 g/d XOS(XOS),(3)CON with 15 g/d EXE(EXE),and(4)CON with 25 g/d XOS and 15 g/d EXE(XOS+EXE).The 60-d experimental period consisted of a 14-d adaptation period and a 46-d sampling *** enteric CO_(2)and CH_(4) emissions and O2 consumption were measured using two GreenFeed units,which were further used to determine the energy utilization efficiency of *** Compared with CON,cows fed XOS,EXE or XOS+EXE significantly(P<0.05)increased milk yield,true protein and fat concentration,and energy-corrected milk yield(ECM)/DM intake,which could be reflected by the significant improvement(P<0.05)of dietary NDF and ADF *** results showed that dietary supplementation of XOS,EXE or XOS+EXE significantly(P<0.05)reduced CH_(4) emission,CH_(4)/milk yield,and CH_(4)/***,cows fed XOS demonstrated highest(P<0.05)metabolizable energy intake,milk energy output but lowest(P<0.05)of CH_(4) energy output and CH_(4) energy output as a proportion of gross energy intake compared with the remaining *** Dietary supplementary of XOS,EXE or combination of XOS and EXE contributed to the improvement of lactation performance,nutrient digestibility,and energy utilization efficiency,as well as reduction of enteric CH_(4) emissions of lactating Jersey *** promising mitigation method may need further research to validate its long-term effect and mode of action for dairy cows.

关键词： Energy utilization efficiency Enteric methane emissions Exogenous enzyme Jersey cows Xylooligosaccharides

广西南宁一次“龙舟水”暴雨空报事件对流生消成因分析

在线全文

学校读者我要写书评

暂无评论

气象 2024年第8期50卷 941-952页

作者：周琰翟丽萍张丁丁樊盛黄卓帆李渝平李紫甜潘杰丽黄增俊南宁市气象局南宁530029 广西壮族自治区气象台南宁530022 广西南宁市邕宁区气象局邕宁530200

2022年6月13日,广西出现大范围暴雨过程,而南宁市区一带暴雨空报;雷达回波在南宁市区北侧衰减、东侧强度维持、南侧新生发展,过程演变复杂。文章采用常规观测资料及ERA5再分析资料,对此次过程中对流生消演变成因进行分析。结果表明:此... 详细信息

2022年6月13日,广西出现大范围暴雨过程,而南宁市区一带暴雨空报;雷达回波在南宁市区北侧衰减、东侧强度维持、南侧新生发展,过程演变复杂。文章采用常规观测资料及ERA5再分析资料,对此次过程中对流生消演变成因进行分析。结果表明:此次过程为典型广西前汛期强降雨环流形势及环境背景;然而受天气尺度冷平流及风暴冷池共同影响,冷空气快速移过南宁市区,北侧风暴出流边界远离母体,风暴前侧低层水汽输送偏东,热力、动力条件均较差,导致回波衰减消散;南宁市区东侧风暴在推进过程中出流边界紧贴母体,风暴前侧低层维持西南急流,沿出流边界不断有对流触发,风暴得以加强或维持;南侧低层高温高湿环境形成,有利于对流有效位能重建或增强。最后建立了此次过程对流生消演变机理概念模型,并通过分析冷池、出流边界、环境条件等要素演变,可对短时临近预报进行补充订正。

关键词：暴雨空报对流生消冷平流冷池出流边界

Delivery Efficiency and Supplier Performance Evaluation in China's E-retailing Industry

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2017年第2期30卷 392-410页

作者： SHI Yong yanG zhuofan yan Hong TIAN Xin Research Center on Fictitious Economy&Data Science Chinese Academy of SciencesBeijing 100190China School of Economics and Management University of Chinese Academy of SciencesBeijing 100190China Key Research Laboratory of Big Data Mining and Knowledge Management Chinese Academy of SciencesBeijing 100190China Department of Logistics and Maritime Studies Faculty of Business The Hong Kong Polytechnic UniversityHong KongChina

This paper focuses on overall and sub-process supply chain efficiency evaluation using a network slacks-based measure model and an undesirable directional distance model. Based on a case analysis of a leading Chinese B2 C firm W, a two-stage supply chain structure covering procurementstock and inventory-sale management is constructed. The research shows overall supply chain inefficiency is attributable to procurement-stock conversion inefficiency. From a view of operations model,the third-party platform model is more efficient than a "shop in shop" self-operated model. However,the self-operated mode performs better in product categories such as computer & Office & digital, food& drink and healthy products due to these products' delivery characteristics and consumers' shopping habits. In the logistics selection, most e-retail players are inclined to choose the hybrid model of 3 PL and self-operated logistics with the product category extension from vertical model to all-category model. These findings may help managers improve supplier-buyer relationship and strengthen supply chain management. This research offers a new explanation regarding the failure of e-retail supply chain.

关键词： Efficiency e-retail performance evaluation supply chain virtual business

Hierarchically mesoporous carbon spheres coated with a single atomic Fe-N-C layer for balancing activity and mass transfer in fuel cells

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2022年第1期4卷 1-11页

作者： Chengyong Shu Qiang Tan Chengwei Deng Wei Du zhuofan Gan yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong yang Xiaohua yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaiChina State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'anChina College of Materials Science and Engineering Huaqiao UniversityXiamenChina Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiangChina State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced MaterialsNanjing Tech UniversityNanjingChina

Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The high-cost PGM catalyst in fuel cells can be replaced by earth-abundant transition-metalbased catalysts,that is,an Fe-N-C catalyst,which is considered one of the most promising ***,the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability,which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass ***,a novel Fe–N–C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are *** synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer *** half-wave potential of the catalyst in 0.1M H_(2)SO_(4) is 0.82 V versus reversible hydrogen electrode,and the peak power density is 812 mW·cm^(−2) in H_(2)–O_(2) fuel ***,it shows superior methanol tolerance,which is almost immune to methanol poisoning and generates up to 162 mW·cm^(−2) power density in direct methanol fuel cells.

关键词： fuel cell hierarchically mesoporous carbon spheres oxygen reduction reaction single‐atom catalysts