Adjoint method for the optimum planning of industrial pollutant sources

The deterioration of air quality is threatening the life and health of people. Scientists in China and other countries have done a great deal of research work on the details of air pollution and the methods of preven-tion and control during the past decades. Up to now, most of the achievements are concentrated on the techniques of controlling pollutant sources and the programs of reduction, which focus on the improve-ment of air quality and the restoration of environment. The techniques of con…     

ENVIRONMENTAL CHANGES IN THE EASTERN CHINA DURING THE LATE PLEISTOCENE

The environmental changes during the Late Pleistocene were more obvious in the eastern China than in other areas at the same latitude, which either between northern and southern, or between land and sea of the eastern China were mostly non-synchronous. The transitional period prior to the last glaciation came about in the northern part of the eastern China about 115,000 yr. ago. The desert environments of the inland of the north China were developed both in the glacial maximum and in the warm interglacial period, but the loess accumulation mostly took place during the glacial period. The sand dunes and the periglacial solifluctions in the lower Changjiang (Yangtze) River region were formed during the last glacial period. The event of lowest surface temperature occurred at 98,000 yr. B.P. and 59,000 yr. B.P. in the northern part of the South China Sea but not during the full-glacial stage. The phenomena mentioned . above were the result of the following reasons that the paleo-environmental changes in the     

Environmental records of lacustrine sediments in different time scales: Sediment grain size as an example

Understanding the past is the key to know thepresent and to predict the future. As a core project ofthe International Geosphere Biosphere Program, PastGlobal Changes (PAGES) aims to reconstruct theevolution history of global climate, global environ-ment and global ecosystem with resort to all kinds ofnatural records, so as to reveal the change rules(change processes, change amplitude and change rate)of the global environment and thus provide scientificbasis for predicting climate changes p…     

Synthesis of todorokite by refluxing process and its primary characteristics

Todorokite is one of the common manganese ox-ides in manganese ore deposits, weathering product of manganese-bearing rocks, soils and sediments. It is also an important component in the abundant marine manganese nodules. Since todorokite was firstly found in Japanese Todoroki mine in 1934, its properties and origination have appeared to be very interesting to many researchers[1—3]. It has a stable structure similar to porous molecular sieves, constructed of triple MnO6 octahedral chains. Th…     

Helmert方差分量估计严密公式与简化公式等价性的证明

在分析了Helmert方差分量估计严密公式与简化公式迭代收敛结果一些统计性质的基础上,导出了关于收敛结果共同的求解方程,从理论上证明了两种结果的等价性,为使用简化公式提供了依据。     

基于GIS的测量标志普查信息管理系统

叙述了在VB和MapObjects组件环境下,建立测量标志信息普查管理系统。详细介绍了系统数据的处理和利用MapObjects组件开发系统过程,以及系统的主要功能。利用该系统可以全面了解和掌握某范围内测量标志的现状和完好程度,为测量标志的维护和管理提供依据。该系统提供方便、快捷的影像浏览、查询等功能,为测绘主管部门和测绘单位管理和使用这些控制点提供方便。     

海洋地理信息系统中两个问题的探讨

由离散水深数据如何描述海底地貌以及水深数据与属性数据如何关联一直是海洋地理信息系统(MGIS)需要解决的问题。文中探讨利用超图中层次结构和非层次关系对海底山峰构建,最后在一个试验区内实现,论证了其可行性。     

利用物理方法确定外方位元素的卫星立体摄影测量的精度分析

本文在分析用物理方法确定外方位元素的情况下卫星立体摄影测量的精度影响因素,推导了卫星立体摄影测量的理论精度计算公式,并以SPOT5 HRS立体像对为例,计算了SPOT5 HRS立体测量的理论精度,进行了利用少量地面控制点的立体测量试验。结果证明卫星立体摄影测量的理论精度估算公式是正确的,同时SPOT5 HRS立体测量精度能够满足1∶50000测图的要求。     

Performance of rate detector algorithms for an integrated GPS/INS system in the presence of slowly growing error

In the Global Positioning System, there is no provision for real-time integrity information within the Standard Positioning Service, by design. However, in safety critical sectors like aviation, stringent integrity performance requirements must be met. This can be achieved using the special augmentation systems or RAIM (Receiver Autonomous Integrity Monitoring) or both. RAIM, the most cost-effective method relies on data consistency, and therefore requires redundant measurements for its operation. An external aid to provide this redundancy can be in the form of an Inertial Navigation system. This should enable continued performance even when no redundant satellite measurements are available. An algorithm presented in previous papers by the authors detects the rate of slowly growing errors. The algorithm was shown to be effective for early detection of slowly growing errors that belong to the class of most difficult to detect errors. Firstly, rate detector is tested for varying faults. Secondly, real data are used to validate the rate detector algorithm. The data are extensively analyzed to ascertain whether it is suitable for integrity and fault diagnostics. A modification to the original rate detector algorithm is suggested by addition of a bias state to the dynamic model. The performance is then compared with the existing techniques and substantial improvement is shown.     

以宗地统一代码为核心加快推进国家电子文件管理系统建设

尊敬的王世元副部长,各位领导、同志们： 上午好!很高兴应邀参加国土资源部在吉林长春召开的试点工作会议。首先我代表国家电子文件管理部际联席会议办公室对“全国宗地统一代码电子文件管理试点工程”项目启动会议的召开表示祝贺!下面,我把国家电子文件管理试点工作的情况和一些想法与大家交流—下。