《测量学》实践性教学中教师的主导作用   总被引：10，自引：1，他引：9  

李素荣 《测绘工程》2000,9(1):72-75,78

实践是学好测量学的重要手段,文中就如何搞好理论与实践的关系进行了阐述,并重点强调了教师要有过硬的操作技能,是其中的重中之重,对其它同类专业的教学有指导作用。  相似文献   

天线座水平度对目标定向影响的解析分析     

张维全  张岳  李洋  赵姝慧  王吉宏  袁健  班显秀 《气象与环境学报》2014,30(2):93-100

本文定义了在天气雷达天线座水平度数值非0条件下的“实用坐标系”,并给出了该坐标系与“理想坐标系”之间的解析关系;在此基础上通过严格数学分析,给出了天气雷达探测目标的方位、仰角在“实用坐标系”中的读数与其在“理想坐标系”中对应的方位、仰角数值之间的多元函数关系;定义了方位误差分析函数、仰角误差分析函数,并利用所定义的误差分析函数对天气雷达天线座水平度数值如何影响目标定向进行了深入的解析分析。结果表明：仰角读数在45°以下,天线座水平度引起的方向定位误差不会大于天线座水平度自身的数值;当仰角读数大于45°后,天线座水平度引起的方向定位误差将迅速增大。尤其在接近天顶的空间区域,天线座水平度引起的方向定位误差可达天线座水平度数值本身的百倍以上。  相似文献   

项目教学法在专业遥感课程教学中的应用     

孙德勇  徐永明  陈健 《地理空间信息》2011,(6):148-149,152

以海洋遥感专业课程为例,展示项目教学法在遥感应用领域课程教学中的应用,教学实践表明该方法能取得较好的教学效果。通过项目教学法,不但顺利有效地完成了教学任务,更是在充分激发学生学习兴趣的基础上,提高了学生分析问题解决问题的能力,达到了该类课程的教学目的。  相似文献   

人工湿地系统对泉河水质净化处理的实践应用     

王鑫华  高奔  邹志国  马慧  王漫雪 《湿地科学与管理》2013,(2):11-14

泉河是山东省济宁市汶上县一条重要的河流,工业点源、农业面源污染使得泉河污染,水质超标。为净化水质,建设了泉河河道走廊人工湿地工程,总长度23km,规模319.7hm2,总投资5170万元。主要采用河道滞留塘+表面流人工湿地组合工艺,处理汶上县污水处理厂外排水、沿河周边农村生活污水及农田退水,污水处理规模2.0万m3/d。工程2010年10月开工,2011年6月建成并正常运行。通过1a多的运行结果表明,该人工湿地工程具有较高的污染负荷去除率,实现了河道的生态修复和沿河生态环境治理,泉河生态环境得到了明显改善。  相似文献   

Practical evaluation of sinkage and trim effects on the drag of a common generic freely floating monohull ship     

《Applied Ocean Research》2017

A practical method to account for the influence of sinkage and trim on the drag of a freely floating (free to sink and trim) common monohull ship at a Froude number F ≤ 0.45 is considered. The sinkage and the trim are estimated via two alternative simple methods, considered previously. The drag is also estimated in a simple way, based on the classical Froude decomposition into viscous and wave components. Specifically, well-known semiempirical expressions for the friction drag, the viscous pressure drag and the drag due to hull roughness are used, and the wave drag is evaluated via a practical linear potential flow method. This simple approach can be used for ship models as well as full-scale ships with smooth or rough hull surfaces, and is well suited for early ship design and optimization. The method considered here to determine the sinkage and the trim, and their influence on the drag, yields theoretical predictions of the drag of the Wigley, S60 and DTMB5415 hulls that are much closer to experimental measurements than the corresponding predictions for the hull surfaces of the ships in equilibrium position at rest. These numerical results suggest that sinkage and trim effects, significant at Froude numbers 0.25 < F, on the drag of a typical freely floating monohull ship can be realistically accounted for in a practical manner that only requires simple potential flow computations without iterative computations for a sequence of hull positions.  相似文献   

我国地理信息系统建设及进展(1)   总被引：3，自引：0，他引：3  

黄杏元 《现代测绘》2004,27(2):3-6

GIS的基础背景和发展阶段与GIS业务化应用系统的建设两个部分，着重叙述了GIS建设的探索过程和发展思路，指出GIS建设从初步发展时期的研究实验、局部应用向着实用化、集成化和产业化方向发展，成为国民经济和社会发展普遍使用的工具，在各行各业发挥着重要的作用。同时用实例说明GIS业务化应用系统，在我国大体经历的四个发展阶段。  相似文献   

Periodic heat conduction in a non-uniform soil     

R. J. Wiltshire 《地球表面变化过程与地形》1983,8(6):547-555

The one dimensional heat conduction equation is applied to a non-uniform soil in which harmonic boundary conditions are specified. The analytic solutions are derived for practical use and satisfy a law that the thermal diffusivity is proportional to the square of the speed of the temperature wave. Depending on the nature of this speed the solutions may be categorized as circular, parabolic, hyperbolic, or exponential. A practical example is given in which the damping depth and thermal capacity of the soil both vary with depth. It shows that there may be considerable differences between uniform and nonuniform soils as far as temperature is concerned. A case of a slowly varying soil layer is also examined and is compared with the constant soil solution.  相似文献   

地质实习基地建设实践与思考——以昌平南口实习基地为例     

宋丙剑 《城市地质》2015,(1):15-19

为了突出实践教学效果,更好地完成任职教育,2012-2014年武警警种学院打造了南口综合地质实习基地。该基地筛选并确立了5条地质观测路线31个观察点。通过3年10个班次的野外地质实习,较好地完成了教学任务,丰富和发展了实习基地的内容,取得了良好的办学效益,反映出该基地具有较强的利用和推广价值。建设过程中,应重点抓好实习基地选址、实习计划与实习指导书编制工作,才能推进实习基地健康可持续发展。  相似文献   

Practical control of underactuated ships     

K.D. Do 《Ocean Engineering》2010,37(13):1111-1119

This paper presents a design of global smooth controllers that achieve the practical stabilization of arbitrary reference trajectories, including fixed points and nonadmissible trajectories for underactuated ships. These ships do not have an independent actuator in the sway axis. The control design is based on several nonlinear coordinate changes, the transverse function approach, the back-stepping technique, the Lyapunov direct method, and utilization of the ship dynamics. Simulation results illustrate the effectiveness of the proposed control design.  相似文献   

科技成果转化为现实生产力的思考     

吴学伟  张宝利 《地理信息世界》2000,(1)

文章从科技成果转化的重要性出发,分析了当前在测绘科技成果转化中存在的问题,提出一些解决这些问题的看法与建议。  相似文献