检索结果-南通市图书馆

Study on Volume Variation and Stability of Riverbed in the Yangtze Estuary

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2023年第3期37卷 433-446页

作者： DING Lei JIAO Jian TONG Chao-feng WANG Yi-fei CHEN Ben sun jie-ying DOU Xi-ping Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China College of Harbour Coastal and Offshore EngineeringHohai UniversityNanjing 210098China State Key Laboratory of Hydraulics and Mountain River Engineering Sichuan UniversityChengdu 610065China

In recent years,regional floods and typhoons have occurred in the Yangtze *** dynamic conditions and dramatic reduction of sediment discharge in the basin are affecting the dynamic equilibrium pattern of the Yangtze *** on the field measurement data and theoretical derivation,this paper analyzed the changing process of runoff-sediment discharge into the sea after the operation of the Three Gorges Project(TGP),and the tidal dynamics and sediment variation characteristics of the Yangtze *** erosion of South Branch mainly occurs in the channel below-10 m contour,and the riverbed volume below contours 0 m and-10 m has a good correlation with the sediment discharge of Datong Station in the previous *** this basis,the ratio of the horizontal distance from the starting point to the section centroid below the average water level(B_c)and the water depth at the section centroid(H_c)was proposed to describe the change of the section *** relationships between the water-diverting ratio,the sediment-diverting ratio and the water-diverting angle,the conditions of runoff and sediment discharge from the upper reach and the characteristics of the riverway section were established,and the theoretical calculation equations of the water-diverting ratio,the sediment-diverting ratio and the diverting angle of each bifurcation were also established.

关键词： Yangtze Estuary volume variation section shape riverbed stability

Mechanism of the Impact of Floods and Typhoons on the Morphological Evolution of the Yangtze Estuary

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2023年第3期37卷 447-457页

作者： JIAO Jian DING Lei HAN Yu-fang sun jie-ying YANG Xiao-yu HUANG Yu-ming DOU Xi-ping Key Laboratory of Port Waterway and Sedimentation Engineering of MOTNanjing Hydraulic Research InstituteNanjing 210029China State Key Laboratory of Water Resources Engineering and Management Wuhan UniversityWuhan 430072China

In the last two decades,the Yangtze Estuary has undergone significant changes under the influence of reduced sediment inflow and estuary *** study investigates the influence of floods and typhoons on sediment concentration and the morphological evolution of shoals and channels in the Yangtze *** analysis is conducted through the utilization of topographic data measured pre-and post-flood events and observations of hydro-sedimentary changes during *** using a generalized estuary mathematical model,this study examines the interplay between varying tidal ranges,tidal divisions,runoff volumes,and regulation projects on the erosion and deposition of shoals and channels in bifurcated *** results show that due to the implementation of river and waterway regulation projects,the impact of the 2020 flood on the main channel and shoal was significantly less than that of the1998 *** swing amplitude of the South Branch main channel ***,local river sections such as the Southern Waterway of Baimao Shoal exhibited *** typhoons,sediment concentration in the 20 cm above the bottom increased significantly and was closely related to wave processes,with a weakened correlation to tidal *** typhoons,high shoals in South Passage above 0 m were silted up,while the terrain on one side of the tail of Jiuduan Shoal in the downstream deep-water area was generally scoured due to strong wave *** generalized mathematical model of the bifurcated estuary revealed that M2 tidal component contributed most to the ero sion and deposition evolution of estuary shoals and channels,with floods exhibiting characteristics of sedime ntation on shoals and erosion on *** the implementation of a branch rectification project,branch resistance increased,diversion decreased,and the riverbed changed from pre-project erosion to post-project sedimentation,with an increase in erosion in non-project branches.

关键词： the Yangtze Estuary flood typhoon morphological evolution

An Effective Image Retrieval Mechanism Using Family-based Spatial Consistency Filtration with Object Region

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2010年第1期7卷 23-30页

作者： Jing sun ying-jie Xing School of Mechanical Engineering, Dalian University of Technology, Dalian 116023, PRC School of Mechanical Engineering Dalian University of Technology Dalian PRC

How to construct an appropriate spatial consistent measurement is the key to improving image retrieval performance. To address this problem, this paper introduces a novel image retrieval mechanism based on the family filtration in object region. First, we supply an object region by selecting a rectangle in a query image such that system returns a ranked list of images that contain the same object, retrieved from the corpus based on 100 images, as a result of the first rank. To further improve retrieval performance, we add an efficient spatial consistency stage, which is named family-based spatial consistency filtration, to re-rank the results returned by the first rank. We elaborate the performance of the retrieval system by some experiments on the dataset selected from the key frames of ＂TREC Video Retrieval Evaluation 2005 （TRECVID2005）＂. The results of experiments show that the retrieval mechanism proposed by us has vast major effect on the retrieval quality. The paper also verifies the stability of the retrieval mechanism by increasing the number of images from 100 to 2000 and realizes generalized retrieval with the object outside the dataset.

关键词： Content-based image retrieval object region family-based spatial consistency filtration local affine invariant feature spatial relationship.

Heme oxygenase-1 regulates the major route involved in formation of immune hepatic fibrosis in rats

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第22期123卷 3304-3308页

作者： DUAN Zhi-jun YANG Dong WANG Fei sun ying-jie sun Xiao-yu ZHENG Miao-lei Department of Gastroenterology First Affiliated Hospital of Dalian Medical University Dalian Liaoning 116011 China

Background Heme oxygenase （HO） plays roles in some liver diseases, but what it does in immune liver fibrosis is rarely reported. We investigated the regulation mechanisms of HO-1 in rat immune liver fibrosis to find routes for intervention. Methods Male Sprague-Dawley rats were randomly divided into control group （N, n=-12）, fibrosis group （F, n=20）, cobalt protoporphyrin （CoPP） inducing group （Co, n=20） and zinc protoporphyrin （ZnPP） inhibiting group （Zn, n=20）. In groups F, Co and Zn, immune liver fibrosis was established with human serum albumin. At the attacked stage, CoPP （5 mg/kg） and ZnPP （5 mg/kg） were intraperitoneally injected in groups Co and Zn, respectively. After establishment of rat models, the numbers of rats reduced to 11, 15, 17 and 12 in groups N, F, Co and Zn respectively, because of death during the process. HO-1 in liver was detected by Western blotting and immunohistochemistry. The indexes of fibrosis were assessed by radioimmunoassay. Concentrations of serum transforming growth factor-β1 （TGF-β1）, and tissue inhibitor of metalloproteinses （TIMP-1） were detected using enzyme-linked immunosorbent assay. Hepatic stellate cell （HSC） and proliferation degree of fibrosis were assessed by pathological examination. Data analysis was performed by SPSS 10.0 software. Results The expression of HO-1 in group F was significantly higher than that in group N, but lower than that in group Co （P 〈0.05）; while that in group Zn was lower than in group F （P 〈0.05）, but still higher than that in group N （P 〈0.01）. Compared with group N, liver functional and liver fibrosis indicators were increased in group F （P 〈0.01）, while comparing to group F, they were decreased in group Co （P 〈0.05） and increased in group Zn （P 〈0.05）. CoPP reduced the extent of hepatocellular injury and hepatic fibrosis in comparison with group F （P 〈0.01）, being the opposite effect of ZnPP （P 〈0.01）. HSC was observed using indirect method and the result showed that the number of HSC in gro

关键词： heme oxygenase-1 immune fibrosis rats

Particle size distribution of the organic matters in the treated leachate using aged-refuse-bioreactor

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering 2009年第7期3卷 18-22页

作者： sun ying-jie WANG Hua-wei ZHAO You-cai School of Environmental ＆ Municipal Engineering Qingdao Technological University Qingdao 266033 China The State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai 200092 China

Micro-filtration membrane （1.2 μm）, hyper-filtration membrane （0.45 μm） and nano-filtration membrane （1000 Dalton） were used to characterize the particle size distribution of the organic matters in effluent leachate treated by the aged-refuse-bioreactor（ARB） installed at Laogang Refuse Landfill, Shanghai. The results showed that the particle size distribution of the treated fresh and aged leachate using the ARB were quite consistent. The organic matter with particle size below 1000 Dalton accounted for about 90%, balanced with the suspended （〉1.2 μm） and colloidal （1000 Dalton-l.2μm） matters. Hence, it is proposed that coagulation, nano-filtration and electrically chemical oxidation may be not applicable for the advanced treatment for the effluents to reach the discharge standard limit value defined in Chinese national Standard for Pollution Control on the Landfill Site of Municipal Solid Wastes （GB16889-2008）, CODCr〈100 mg/L. Aged refuse bioreactor combined reverse osmosis was suggested as an economically and technically feasible technology to treat sanitary landfill leachate.

关键词： landfill leachate particle size distribution nano-filtration aged refuse bioreactor: reverse osmosis

Mechanical responses, texture and microstructural evolution of high purity aluminum deformed by equal channel angular pressing

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

Journal of Central South University 2015年第10期22卷 3698-3704页

作者：汪冰峰孙杰英邹金佃 VINCENT Sherman 李娟 School of Materials Science and Engineering Central South University Departments of Mechanical and Aerospace Engineering and Nanoengineering University of California Key Lab of Nonferrous Materials of Ministry of Education (Central South University)

Ultrafine-grained(UFG) high purity aluminum exhibits a variety of attractive mechanical properties and special deformation behavior. Equal channel angular pressing(ECAP) process can be used to easily and effectively refine metals. The microstructure and microtexture evolutions and grain boundary characteristics of the high purity aluminum(99.998%) processed by ECAP at room temperature are investigated by means of TEM and EBSD. The results indicate that the shear deformation resistance increases with repeated EACP passes, and equiaxed grains with an average size of 0.9 μm in diameter are formed after five passes. Although the orientations distribution of grains tends to evolve toward random orientations, and microtextures(80°, 35°, 0°),(40°, 75°, 45°) and(0°, 85°, 45°) peak in the sample after five passes. The grain boundaries in UFG aluminum are high-angle geometrically necessary boundaries. It is suggested that the continuous dynamic recrystallization is responsible for the formation of ultrafine grains in high purity aluminum. Microstructure evolution in the high purity aluminum during ECAP is proposed.

关键词： equal channel angular processing(ECAP) aluminum grain refinement microstructure mechanical property

平潭海峡公铁两用大桥双层结合全焊钢桁梁设计

在线全文

学校读者我要写书评

暂无评论

桥梁建设 2016年第1期46卷 1-5页

作者：孙英杰徐伟中铁大桥勘测设计院集团有限公司湖北武汉430056

平潭海峡公铁两用大桥深水区非通航孔引桥采用跨度88m和80m的双层结合全焊钢桁梁。其中88m钢桁梁采用带副桁的华伦式桁架,桁高13.5m,桁宽14m,标准节间长10.8m。上层公路桥面宽35.5m,采用钢筋混凝土板与钢桁上层纵、横梁结合,标准桥面板... 详细信息

平潭海峡公铁两用大桥深水区非通航孔引桥采用跨度88m和80m的双层结合全焊钢桁梁。其中88m钢桁梁采用带副桁的华伦式桁架,桁高13.5m,桁宽14m,标准节间长10.8m。上层公路桥面宽35.5m,采用钢筋混凝土板与钢桁上层纵、横梁结合,标准桥面板厚0.25m;下层铁路桥面采用双幅预应力混凝土槽形梁,竖墙和底板厚0.36m,利用剪力钉与钢桁铁路横梁结合。该桥采用双层结合桥面避免桥面铺装难题,利用公路纵梁缩短弱化桥面系的共同作用,通过抬高桁架节点位置实现曲线超高,优化铁路槽形梁结合顺序充分发挥预应力,选用钢梁全焊整体架设技术降低海上施工风险,实现了跨海大桥建设的标准化、工厂化、预制化、大型化。

关键词：跨海大桥公路铁路两用桥钢桁梁双层结合铁路槽形梁全焊结构设计

在线全文

学校读者我要写书评

暂无评论

汉语双宾语句语义分析

湘潭大学学报（哲学社会科学版） 2006年第3期30卷 152-157页

作者：孙英杰北京语言大学外国语学院北京100083

双宾结构的分析涉及到句法与语义的接口问题,而题元角色理论无法从根本上解决其从语义到句法之间的映射问题。Larson采用的是派生的方法,但由于他所运用的X’理论存在着明显的缺陷,使其派生论的解释力明显下降。从双宾结构和与格结构的... 详细信息

双宾结构的分析涉及到句法与语义的接口问题,而题元角色理论无法从根本上解决其从语义到句法之间的映射问题。Larson采用的是派生的方法,但由于他所运用的X’理论存在着明显的缺陷,使其派生论的解释力明显下降。从双宾结构和与格结构的词汇概念结构、谓词论元结构及表层结构来看,与格结构强调的是动作,而双宾结构强调的是动作所产生的结果,二者之间的转换受词汇语义的限制,因为双宾语句中的动词蕴涵与之相对应的与格结构中的动词。因此,二者的语义可以通过词汇语义学的词汇蕴涵来解释。

关键词：题元角色题元栅格双宾语句与格结构词义蕴涵嵌入

在线全文

学校读者我要写书评

暂无评论

被动式与动词的及物性

北方论丛 2006年第2期 70-74页

作者：孙英杰牡丹江师范学院

及物动词作为动词的一种次分类,其内部并不是同质的,因为有些及物句能转换成被动句,有些则不能。在这个认识的基础上,可利用被动式作为一种测试手段来判断及物动词的及物性问题。在参照原型及物结构与非原型及物结构的观点及观察语料的... 详细信息

及物动词作为动词的一种次分类,其内部并不是同质的,因为有些及物句能转换成被动句,有些则不能。在这个认识的基础上,可利用被动式作为一种测试手段来判断及物动词的及物性问题。在参照原型及物结构与非原型及物结构的观点及观察语料的基础上,首先把及物动词按能否进入被动句式分成两类,然后再根据能否单独出现在被动句式把出现在被动句式的动词分成两类。这样,及物动词就可以按照它们的及物性被分成三个次类,以此建立汉语及物动词的及物性阶层。

关键词：被动式及物性原型及物结构非原型及物结构及物阶层