查询词典 datum

This paper proves compactly the conclusion that the first datum of original data lists doesnt work in the course of building GM(1,1) model.Further, A zero addend GM(1,1) combining forecasting approach that takes into account the first datum is developed.

对GM(1，1)基本建模过程中第一个数据不起作用的结论作了全新的简洁的推导，提出了计及第一个数据的零加数GM(1，1)组合预测方法。

The WGS 84 Datum is generally accepted as the best simple mathematical model for the overall shape of the earth, and is an ellipsoid with an equatorial radius of 6378.1370 km and a polar radius of 6356.7523 km, and is centred on the earth's centre and orientated to the spin axis.

WGS 84基准﹙ WGS 84 Datum ﹚被普遍接受为地球整体形状之最简单数学模型，是一个赤道半径﹙ equatorial radius ﹚ 6378.1370公里和北极半径﹙ polar radius ﹚ 6356.7523公里之椭球﹙ ellipsoid ﹚，以地球的中心为中心点，并定位於﹙ orientated to ﹚自转轴﹙ spin axis ﹚。

It becomes a information exchange site,the exploration project,work area,research production,seismic datum,explainer datum,well datum can be organized into one system,which can share the research production in the exploration project;Through the datum expression of well decision,we can achieve the browsing of work area basemap,the seismic section"s remote display,the well position report"s display,the visual information of well"s wall.The system can lead to a right direction for those expert"s exploration decision .The system runs through all the process of well positon"s decision,deployment and management,which makes the exploration work becoming integrated.Now we can manage the well positon"s decision with computer,which improves work efficiency,condense whole exploration circle.

油田井位部署辅助决策系统以项目数据库的方式将分散在多个研究单位或个人手中的各类图档资料信息集中分类地保存起来，通过该系统使勘探项目、工区、研究成果、地震数据体、解释数据、井数据等有机地组织在一起，使勘探研究成果在勘探项目组内进行了充分共享；基于项目库，系统实现了井位部署决策所需的：工区底图浏览、地震剖面远程显示、井筒信息可视化，为论证专家提供了论证现场所需数据的展示；采用井位聚类分析和模糊数学综合评判决策方法，为井位论证决策提供了基本模型；利用井位部署流程子系统贯穿了井位论证、部署、管理业务的全过程中，使勘探业务有机的整合为一体，实现了井位论证工作的计算机管理。

Firstly,the wavelet-based contourlet coding using an SPIHT-like algorithm is utilized on the plain image,and as a result,the compressed datum stream could be achieved which is then mapped to a 3D bit matrix. Afterward,a chaotic sequence is generated by Lorenz chaotic map,and it is preprocessed to a bit sequence which is used to permute and substitute the elements of the 3D bit matrix achieved above. In the end,the processed 3D matrix is mapped back to datum stream,and the encrypted compressed image could be achieved if decoding and inverse transform are performed on the datum stream.

首先采用基于小波的Contourlet变换的类等级树集合分割编码算法对明文图像进行压缩，得到压缩数据流，然后将压缩数据流映射为一个三维位矩阵；利用Lorenz混沌映射产生混沌序列，并对其进行预处理得到比特值序列，根据比特值序列对上述三维位矩阵进行置乱和替代操作；将置乱和替代后的位矩阵重新映射为数据流，并对其进行解码和反变换操作，得到加密后的压缩图像。

Based on the whole year datum of 251 examination items recorded by 102 digital stations of earthquake underground fluid in 2003, systemically summarizing the distribution of digital stations, quality of the datum , the joint between the digital datum and simulative datum , and so on in china, there is a comparison analysis on the actuality of digital observation of earthquake underground fluid and part of means between homeland and fremdness, preminarily discussing the questions of digital monitoring for earthquake underground fluid in china.

以2003年全国地震地下流体数字化的102个台站的251个测项的全年资料为基础，系统总结了全国数字化台站的分布、资料的质量、数字化资料和模拟资料的衔接情况等，并就目前我国地震地下流体数字化监测的现状和国内外的部分手段进行了对比分析，初步探讨了我国地震地下流体数字化监测中存在的问题。

Based on the whole year datum of 251 examination items recorded by 102 digital stations of earthquake underground fluid in 2003, systemically summarizing the distribution of digital stations, quality of the datum, the joint between the digital datum and simulative datum, and so on in china, there is a comparison analysis on the actuality of digital observation of earthquake underground fluid and part of means between homeland and fremdness, preminarily discussing the questions of digital monitoring for eart...

以2003年全国地震地下流体数字化的102个台站的251个测项的全年资料为基础，系统总结了全国数字化台站的分布、资料的质量、数字化资料和模拟资料的衔接情况等，并就目前我国地震地下流体数字化监测的现状和国内外的部分手段进行了对比分析，初步探讨了我国地震地下流体数字化监测中存在的问题。

Based on core datum,logging informations,seismic datum and geological datum,the author constructs the sedimentary mode of Chang 61 in the area and compartmentalizes five microfacies including subaqueous distributary channel,interd...

以岩心资料、测井资料、地质资料为基础，结合沉积物粒度分析、岩心观察、取心井岩性和砂体分布特征，建立了吴旗地区长61储层的沉积相模式，并将沉积微相细分为水下分流河道、分流间、远砂坝、席状砂、河口坝5种微相类型。

For instance, datum of past mainly point to numerical values and characters, now plenty media datum is emerging, which bring the advantages about the vivid manifest of abstract information, at the same time also bring the disadvantage about management of these vast datum.

因此对这些类型数据的妥善管理给仿真系统提出了新的要求。

Finally this paper achieves a new method about Modeling and simulation of the liquid cargo tank. 3 The calculation of tank capacity based on UG/CAD modeling is studied in this paper . The calculation datum point is gotten by interposition of ship hull at first. Then many datum plane that go through different sounding and heel is created . The cad modeling of oil is created by the bool of the datum plane and the cad modeling of tank.

在使用UG建立准确的计量舱满舱CAD模型的基础上，采用插值得到计量舱计量基准，根据不同测深和不同纵倾值，建立一系列计量液位面，计量舱满舱CAD模型和计量液位面布尔运算后得到实际油液的CAD模型，通过计算油液CAD模型的体积，实现对计量舱容积的计量。

This fund item has carried out research on the current situation of various substances in urban fringe and historical space datum by such efficient space datum collecting technologies as radar, aviation remote sensing, spaceflight remote sensing, GPS and such processing technology as GIS. Monitoring its changing progress with remote sense technology and the space datum can be updated rapidly.

本基金项目利用雷达技术、航空遥感、航天遥感、GPS、GIS等多种高效率的空间数据采集和处理技术，对城市边缘区各种物质要素的现状和历史空间数据进行了研究；运用遥感技术跟踪其变化过程，进行空间数据的快速更新。

Graf, without question, is the greatest women's player in history.

格拉芙，现在，毫无疑问是女子网坛历史上最伟大的选手。

If not, you will have to look around at all your important data.

如果没有，您将需要检查所有的重要数据。