排序方式： 共有55条查询结果，搜索用时 393 毫秒
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本文讨论了遥感MSS图像成像的几何原理，阐述了时间序列的姿态、高度参数的序贯拟合推估并给出了其数学模型。试验结果证明，用文中的数学方法所获得的时间序列的姿态、高度参量是足够精确的，这些方法为使用少量地面控制点对遥感图像进行几何精纠正提供了保证。 相似文献
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本文介绍了利用数字影象处理系统进行数字微分纠正的基本原理，分析了利用该系统进行数字微分纠正的各种可能和方法，提出了用阵列代数法进行象元位置内插的数学模型，据此进行了相应的试验和比较，试验证明，阵列代数内插数字微分纠正是一种行之有效的方法。同时还进行了利用数字高程模型数据构成等高线影象的初步试验，结果表明，利用数字影象处理系统制作的数字影象地图具有较好的数学精度。 相似文献
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Research on Pressure Tight Sampling Technique of Deep-Sea Shallow Sediment-A New Approach to Gas Hydrate Investigation 总被引：1，自引：0，他引：1
1 .IntroductionRecent researches have revealed that the geochemical method is an efficient way to indicate theoccurrence of gas hydrate within marine sediments .Accordingtosediment and pore water samples col-lectedfromODPor DSDPdrill cores ,a series of ge… 相似文献
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This paper describes the implementation of a data logger for the real-time in-situ monitoring of hydrothermal systems.A compact mechanical structure ensures the security and reliability of data logger when used under deep sea.The data logger is a battery powered instrument,which can connect chemical sensors ( pH electrode,H2S electrode,H2 electrode) and temperature sensors.In order to achieve major energy savings,dynamic power management is implemented in hardware design and software design.The working current of the data logger in idle mode and active mode is 15 μA and 1.44 mA respectively,which greatly extends the working time of battery.The data logger has been successfully tested in the first Sino-American Cooperative Deep Submergence Project from August 13 to September 3,2005. 相似文献
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The paper presents the design and preliminary test results of a corer used for hard seafloor sediments sampling.Generally the sediment cores are provided by either gravity-type coring or deep-ocean drilling for a range of studies.However,in consideration of the operability and available sample length in collecting hard sediments,these methods exhibit no advantages.In this paper,a new corer which can exploit both hydrostatic energy and gravity energy for hard sediments coring is presented.The hydrostatic energy is provided by pressure differential between ambient seawater pressure and air pressure in an empty cavity.During sampling process,the corer penetrates into the sediment like a gravity corer and then automatically shifts to the percussion mode.The experiments in the laboratory indicate that the corer can complete 40 cycles in the sea with a cycle time of 2.8 seconds in percussion mode and impact the sample tube with the velocity of 0.2 m/s during each cycle.Besides,its adjustable falling velocity can make the corer achieve the maximum efficiency in coring different sediments. 相似文献