美国公共交通导向发展模式浅析     

李乐  田振国  李学慧  杨希  李峰  火厚红  张景燕 《国土资源情报》2016,(5):36-41

美国公共交通导向发展模式有效实现了城市内部能源资源的使用整合,降低了城市私人交通车辆使用所造成的交通阻塞、环境污染、生态恶化等多种问题,是优化城市内部结构与要素配置、控制城市不合理扩张的有效手段.本文在充分分析美国规划体系及公共交通导向发展模式特征的基础上,对其内涵与特点、综合效益、主导机构、实现途径和融资模式等进行综合分析,以期为我国城市内部格局优化及公共交通体系建设提供理论支撑和依据.  相似文献   

Parallel Neural Network-Based Motion Controller for Autonomous Underwater Vehicles   总被引：2，自引：0，他引：2  

甘永 王丽荣万磊  徐玉如 《中国海洋工程》2005,19(3):485-496

A parallel neural network-based controller （PNNC） is presented for the motion control of underwater vehicles in this paper. It consists of a real-time part, a self-learning part and a desired-state programmer, and it is different from normal adaptive neural network controller in structure. Owing to the introduction of the self-learning part, on-line learning can be performed without sample data in several sample periods, resulting in high learning speed of the controller and good control performance. The desired-state programmer is utilized to obtain better learning samples of the neural network to keep the stability of the controller. The developed controller is applied to the 4-degree of freedom control of the AUV “IUV- IV” and is successful on the simulation platform. The control performance is also compared with that of neural network controller with different structures such as normal adaptive neural network and different learning methods. Current effects and surge velocity control are also included to demonstrate the controller＇ s performance. It is shown that the PNNC has a great possibility to solve the problems in the control system design of underwater vehicles.  相似文献   

多规合一 并联审批——新乡市自然资源和规划局持续优化营商环境     

董广 《资源导刊(河南)》2020,(7):26-26

近日,新乡市润华置业负责人将一面印有“勤政高效、情系企业”的锦旗送到该市自然资源和规划局规划管理科负责人手中,点赞该局干部职工“高效、便捷”的服务。2019年以来,新乡市自然资源和规划局坚持目标导向、问题导向,着力营造“近悦远来”的良好发展氛围,深入推进“放管服”改革,着力打造充满活力、富有效率、更加公正的营商环境,让新乡成为资本的洼地、创新的高地、发展的旺地、市民的福地,有力推动了当地经济的快速发展。去年该局被市委、市政府表彰为“服务企业先进单位”。  相似文献   

以科研案例为导向的专业课程教学模式创新研究     

魏伟  魏晓旭  周俊菊  潘竟虎 《地理信息世界》2021,28(5):15-18

作为地理学类研究生课程的核心课之一,《现代地理学中的数学方法》课程对于培养研究生定量分析和评价思维,利用相关地学模型解决地理学中的问题,并学会系统分析方法具有十分重要的理论和实践价值.因此,本文以《现代地理学中的数学方法》课程为例,对其案例和实践环节的教学模式、教学效果进行分析评价,依此探讨提高教学质量和实践效果的模式与方法,对于其他地理学类研究生课程具有指导借鉴意义.  相似文献   

方位伽马在煤层气水平井中的应用          下载免费PDF全文

武程亮 《探矿工程》2021,48(5):69-75

水平井作为煤层气开发的一种井型,施工难度相对较大,主要体现在安全着陆、钻遇率、储层保护、防塌防卡等,其中煤层钻遇率是提高产气量的重要指标。随着钻井技术和随钻仪器的不断发展,保障储层钻遇率的相关地质参数探管、短节和地质导向技术也相继应用在煤层气水平井施工中。现阶段在煤层气水平井中,伽马探管,特别是方位伽马探管的运用较广,利用伽马测井划分岩性、地层对比、计算地层视倾角的功能,为现场决策者提供井内地质参数,能够有效地为钻井服务。本文通过一口煤层气水平井的施工,介绍了方位伽马在煤层气水平井中的应用。  相似文献   

如何使用有线控向系统进行非开挖施工     

李冬瑞 《岩土钻凿工程》2010,(1):70-73

本文结合沈阳南部苏家屯天然气管道由508mm钢管的穿越工程,介绍了有线导向的工作原理和实践经验。  相似文献   

中石油西气东输二期武汉倒水河穿越工程     

臧志成 《岩土钻凿工程》2010,(3):25-27

本文简要介绍了威猛D750x900水平导向钻机在中石油西气东输二期武汉倒水河穿越工程中的应用过程,表明了威猛水平导向钻机的高水平和高质量。  相似文献   

Object-oriented Urban Dynamic Monitoring——A Case Study of Haidian District of Beijing     

An Kai  Zhang Jinshui  Xiao Yu 《中国地理科学(英文版)》2007,17(3):236-242

It is crucial to conduct the land use/cover research to obtain the global change information.Urban area is one of the most sensitive areas in land use/cover change.Therefore land use/cover change in urban areas is very im-portant in global change.It is vital to incorporate the information of urban land use/cover change into the process of decision-making about urban area development.In this paper,a new urban change detection approach,urban dynamic monitoring based on objects,is introduced.This approach includes four steps:1)producing multi-scale objects from multi-temporal remotely sensed images with spectrum,texture and context information;2)extracting possible changed objects adopting object-oriented classification;3)obtaining shared objects as the basic units for urban change detection;4)determining the threshold to segment the changed objects from the possible changed objects using Otsu method.In this paper,the object-based approach was applied to detecting the urban expansion in Haidian District,Beijing,China with two Landsat Thematic Mapper(TM)data in 1997 and 2004.The results indicated that the overall accuracy was about 84.83%,and Kappa about 0.785.Compared with other conventional approaches,the object-based approach was advantageous in reducing the error accumulation of image classification of each datum and in independence to the radiometric correction and image registration accuracy.  相似文献   

非开挖铺管技术在石门电厂灰坝排渗系统施工中的应用     

胡光林 《湖南地质》2009,(5):69-71

介绍了导向钻进和顶管两种非开挖铺管技术在石门电厂灰库坝排渗系统施工中的应用，总结了其成功的经验，为类似工程的施工、设计提供了参考。  相似文献   

导向钻进与夯管锤反夯相结铺设热力套管     

王银献  刘国伟等 《岩土钻凿工程》2001,18(5):10-13

针对地下条件比较复杂，管线铺设精度要求较高的工程，提出导向钻进法与夯管锤反夯相结合的方法进行铺管。并根据具体的工程实例，详细阐述了该技术手段的施工工艺及技术措施。  相似文献