水生动物选择-回避温度试验装置的设计和应用     

蔡泽平  陈浩如 《热带海洋学报》1998,(2)

选择-回避温度是电站温排水生物热效应的重要温度测试指标。文中报道选择-回避温度试验装置的设计、制作及其在海水鱼、虾温度选择性试验中的应用。该装置结构简单,自动控温精度高,性能稳定。实验结果表明：随着驯化温度的提高,鱼和虾的选择最适温度也升高。利用选择-回避温度值可以快速而准确地测定鱼类的最适生长温度和适宜温度范围。  相似文献   

龙陵—瑞丽走滑体系中段自相似结构与热液成矿定位   总被引：4，自引：0，他引：4  

张永北 《地质学报》1999,73(4):334-341

龙陵－瑞丽走滑体系是滇西三江构造带中腾冲地块与邦地块交界线南段的大规模右旋平移走滑带。剖面上它是一个自相似的花状构造体系;平面上则是一个由强应变带与弱应变域交织复合的自相似的网眼构造,表现为大尺度的“网眼构造”套叠小尺度的“网眼构造”的复杂图像,热液蚀变主要集中在不同尺度的弱应变域的下列三个部位：（１）弱应变域消失部斜面朝向与走滑运动方向一致的一侧。（２）强烈错位部;（３）角砾化透镜体中。走滑带的  相似文献   

The spatial allocation of fishing intensity by port-based inshore fleets: a GIS application   总被引：5，自引：1，他引：4  

Caddy  J. F.; Carocci  F. 《ICES Journal of Marine Science》1999,56(3):388-403

  相似文献   

大城市服务业区位理论及其实证研究   总被引：45，自引：6，他引：39  

张文忠 《地理研究》1999,18(3):273-281

文章从经济区位论的角度出发,研究了服务业的类型和不同类型服务业的区位特征,以及服务业布局的理论依据。在此基础上,分析了发达国家大城市服务业布局的特征和空间演变趋势。最后就大城市服务业的区位特征和存在的问题,以及今后的发展方向等进行了研究。  相似文献   

澳门的土地资源与经济发展   总被引：4，自引：0，他引：4  

谭光民 《热带地理》1999,19(4):324-330

以综合地理学原理分析澳门土地资源的特点及土地资源开发史实, 指出填海拓地与经济发展关系和未来经济发展路向： 应充分利用路乙水连贯公路两侧的大片滩涂。着重阐明土地开发中, 研究土地承载力和淡水资源供需平衡的重要性。同时, 提出今后土地资源的利用方向和对策： 加强与周边地区合作; 稳定发展博彩旅游业, 开发大型旅游景区, 发展省、港、澳旅游大三角; 在工业方面, 应建设路乙水—横琴开发区, 以高附加值产品创汇; 搞好交通运输网络、整治环境、强化社会治安。实现以“博彩旅游生财“、“商贸服务生财”和“高质产品生财”, 继续繁荣澳门经济。  相似文献   

我国20世纪工业地理学的发展   总被引：12，自引：2，他引：10  

张雷  陆大道 《地理学报》1999,54(5):391-400

我国工业地理学发轫于２０世纪初,在经历了启蒙和成长两个阶段后,终于成为经济地理学的一个重要分支学科。作为一门实证性学科,我国工业地理学面临国家工业化转型所带来的巨大挑战。为此,实现以政府主导布局的传统理论思维向以市场主导布局理论思维的转变强调空间扩散和空间重组的协调发展和现实布局实践的科学总结将 国工业地理学未来发展的三个最重要和最基本的方向和任务。  相似文献   

Location‐based social media behavior and perception: Views of university students          下载免费PDF全文

Matthew Haffner  Adam J. Mathews  Emily Fekete  G. Allen Finchum 《Geographical review》2018,108(2):203-224

Location‐based social media (LBSM), a specific type of volunteered geographic information (VGI), is increasingly being used as a spatial data source for researchers in geography and related disciplines. Many questions, though, have been raised about VGI data in terms of its quality and its contributors. While a number of studies have explored users’ demographics and motivations for contribution to explicitly geographic forms of VGI, such as OpenStreetMap and Wikimapia, few have focused on these aspects with implicitly geographic forms of VGI, such as LBSM (for example, Twitter and Instagram). This study, through use of an online survey, specifically assesses the LBSM behavior and perceptions of 253 university students, noting differences found in gender, race, and academic standing. We find that the greatest differences are those between males and females, rather than through race or academic standing, and LBSM appears less biased than other forms of VGI.  相似文献   

Application of the state space model to the system of wave energy conversion Analytical method for wave forces on single oscillating rectangular buoy     

ZHENG Yonghong  SUN Xiaoyan  YOU Yage  SHEN Yongming  WU Bijun 《海洋学报(英文版)》2004,23(4):757-765

A new analytical method is proposed to analyze the force acting on a rectangular oscillating buoy due to linear waves. In the method a new analytical expression for the diffraction velocity potential is obtained first by use of the eigenfunction expansion method and then the wave excitation force is calculated by use of the known incident wave potential and the diffraction potential. Compared with the classical analytical method, it can be seen that the present method is simpler for a two-dimensional problem due to the comparable effort needed for the computation of diffraction potential and for that of radiated potential. To verify the correctness of the method, a classical example in the reference is recomputed and the obtained results are in good accordance with those by use of other methods, which shows that the present method is correct.  相似文献   

船基激光法波浪测量仪器的研究   总被引：1，自引：0，他引：1  

王军成  侯广利  刘岩  蒋慧略 《海洋技术学报》2004,23(4):14-17

介绍了船基激光法波浪测量仪器研制的可行性。船载激光测波是利用舰船作测量平台,在水面上方设置激光测距装置,以一定的频率测量探头与水面的垂直距离,分析所测距离信号的变化规律,可以得出波浪高度、周期等信息,描述出波浪的形态和变化规律。文章提出了测量原理,分析了可能遇到的测量误差,给出了相应的解决措施,得出了研究开发船基激光法波浪测量仪器的可行性结论。  相似文献   

Influence of structural parameters on dynamic characteristics and wind-induced buffeting responses of a super-long-span cable-stayed bridge     

Hao Wang  Chunchao Chen  Chenxi Xing  Aiqun Li 《地震工程与工程振动(英文版)》2014,13(3):389-399

A 3D finite element (FE) model for the Sutong cable-stayed bridge (SCB) is established based on ANSYS. The dynamic characteristics of the bridge are analyzed using a subspace iteration method. Based on recorded wind data, the measured spectra expression is presented using the nonlinear least-squares regression method. Turbulent winds at the bridge site are simulated based on the spectral representation method and the FFT technique. The influence of some key structural parameters and measures on the dynamic characteristics of the bridge are investigated. These parameters include dead load intensity, as well as vertical, lateral and torsional stiffness of the steel box girder. In addition, the influence of elastic stiffness of the connection device employed between the towers and the girder on the vibration mode of the steel box girder is investigated. The analysis shows that all of the vertical, lateral and torsional buffeting displacement responses reduce gradually as the dead load intensity increases. The dynamic characteristics and the structural buffeting displacement response of the SCB are only slightly affected by the vertical and torsional stiffness of the steel box girder, and the lateral and torsional buffeting displacement responses reduce gradually as the lateral stiffness increases. These results provide a reference for dynamic analysis and design of super-long-span cable-stayed bridges.  相似文献