查询词典 spatial model

Based on the extended Huygens-Fresnel principle and the quadratic approximation of phase structure function, we have derived the analyticl expression of the spatial degree of coherence for partially coherent flattened beams propagating through the slant turbulent atmosphere with the help of tensor integral, then analyzed the effects of different zenith angle, propagation distance, coherence of source and outer scale of turbulence on the spatial degree of coherence on the receiver.

基于广义惠更斯-菲涅耳原理和相位结构函数的平方近似，运用张量积分的方法导出了部分相干平顶光束通过斜程湍流大气传输后接收面光束空间相干度的解析表达式，分析了不同天顶角、传输距离、光源相干性以及湍流外尺度对接收面光束空间相干度的影响。

In order to reveal the spatial disciplinarian and the driving mechanism of urban land expansion, this paper applies the integrated method of remote sensing and geographic information systems to examine the dynamic changes, spatial patterns, traffic locations, barycenter migrations, allometric growth and driving mechanism of urban land expansion in Beijing.

为了揭示北京市城市用地扩张与城市化的空间推进规律及其驱动机理，本文采用RS和GIS综合集成的研究方法，探讨了北京市城市用地空间扩张的动态变化特征、交通区位特征、重心迁移特征和异速增长特征，并对城市空间扩张的机理进行了分析。

Purpose With immunohistochemical methods under the light and eletronic microscopic level, together with the computer analytic techniques , the expression changes of the synaptophysin in the hippocampus of the rats that have obtained the abilities of spatial discriminative learning and memory established by water maze during the different periods will be studied, after they stopped training. Probing into the relationship between the amenia of the spatial discriminative learning and memory with the expression changes of the synaptophys in.

目的 用免疫组化的光、电镜方法结合图像分析技术，检测经水迷宫训练获得空间辨别性学习记忆功能后的大鼠在停止训练的不同时间段其海马结构内突触素表达的变化。

It expanded to 106119ha in 1973, descented to 99167ha in 1987, backed up to 112440ha, and attained the max value in history—123170ha in 1998 and descent to 109934ha again in 2001. GIS overlaying analysis shows that, the spatial change of Minqin Oasis had the different characteristics in different stage in the last 50 years: at the end of 50's to the beginning of 70%, oasis expandation Was performed by extension of origin oasis; the atrophia of oasis from the beginning from 70's to the 80's was performed by increasing of non-oasis spot pieces of inner part for oasis; the main performance of keeping on expanding of oasis from late 80's to late 90's is outside extension of Baqu oasis near the upper stream, with increased oasis area in interior of hungriness and increased area of non-cultivation in Huqu oasis in the north. From 1998 to 2001, opening up wideness in interior of hungriness continued, but hnngrinessization of oasis became worse. The oases in the Minqin Basin developed from small to large and back to small in terms of area changes, and from south to north then to south in terms of spatial changes.

绿洲分布图的GIS叠加覆盖分析表明，近50年来民勤绿洲的空间变化在不同阶段有不同的特征：50年代末至70年代初，绿洲扩展主要表现为已有绿洲的外延式扩大；70年代初至80年代后期的绿洲萎缩，主要表现为绿洲内部非绿洲斑块增加；80年代后期至90年代后期的持续扩展，主要表现为靠近上游的坝区绿洲向外围扩展和荒漠腹地绿洲面积的增加，而北部湖区绿洲弃耕面积不断扩大；98年至2001年，绿洲荒漠腹地的开荒还在继续，但湖区的绿洲荒漠化还在进一步加剧。50年来民勤绿洲的发展总体上经历了一个面积由小到大再到小，空间位置上从南而北再向南的迁移过程。

Based on Oracle, TOS in place with Minimum Bounding Rectangle were stored and become attribute that the surface feature is collected by way of its Spatial in the paper. For adopting R-Tree that Oracle Spatial offers and set up the index and collect index on the space position to the TOS, this kind of method is simpler in design, and its index result is belter.

基于Oracle，本文将地物集的包络矩形以其Spatial的方式存储成为地物集的属性，并采用Oracle Spatial提供的R树索引对地物集进行空间位置上的索引，这种方法设计比较简单，并且其索引效果也比较好。

The spatial analysis is an important component of GIS and distinguishes GIS from the general cartographic system and management information system . The spatial analysis performance is an important performance of GIS .

空间分析是地理信息系统的一个极其重要的组成部分，是地理信息系统区别于一般的制图系统和信息管理系统的根本所在，其性能是地理信息系统的性能的重要标志。

The problem of cartographic generalization of spatial data concerns deriving spatial data with proper level of details when the data are used for an application.

制图学中的制图综合就是为不同的应用生成恰当的细节层面。

The study investigated the spatial preposition acquisition over among Chinese EFL learners. It was to explore whether there exists a correlation between their use of the preposition and the centralness of spatial meanings of the word.

本文主要调查了中国二语学习者英语空间介词over 的习得情况，并从原型理论和中心—边缘意义的角度讨论了在空间意义方面over 的意义核心程度与学习者使用over 一词的空间意义之间是否存在相关性。

In this section, applying the method, from abstract to specific and from history to present, it analyzes the operation mechanism of urbanization economy affected by market mechanism; puts forward four theories of urbanization economy from economic perspective, including agriculture surplus and comparison advantage; non-agricultural industry; agglomeration economy and spillover effect, on this basis of the theories, it, on one hand, analyzes two kinds of internal mechanism in the chronologic operation of urbanization economies: increasing mechanism of urbanization economies in urban output industry; and changing mechanism from specialization to integration, which are the representations of the evolution of "mart" development; on the other hand, it analyzes two internal mechanism of dimensional operation of urbanization economy: internal spatial enlargement mechanism of urbanization economies from monocentric city to multi-center city, and external spatial enhancement mechanism which represents city-regionalization and city-chain connection, the later two mechanism represent the evolution of "polis" development.

这一部分，按照由抽象到具体和由历史到现代的研究方法，分析了市场机制作用下的城市化经济运行机理，从经济学角度提出了农业剩余与比较优势、非农产业、聚集经济、外溢效应四大城市化经济定理；在此基础上，一方面分析了城市化经济运行沿时间增长的两个内在内容提要机制：城市输出产业的城市化经济增长机制和从专业化到综合化的城市性质变迁机制，它们主要表现为&市&发展的延续；另一方面分析了城市化经济运行沿空间增长的两个内在机制：从单中心到多中心的城市化经济运行的内部空间扩展机理和表现为城市区域化、城市连绵体的城市化经济运行的外部空间扩展机理，它们主要表现为&城&发展的延续。

With the three axes circumrotation method, the position of the incident laser is unchanged, and the conversion from the complicate three-dimensional spatial position relation into a two-dimensional plane is realized, by adjusting the relative positions of the detector and the target with certain spatial conversion relation.

采用三轴旋转方式，保持入射光源的位置不变，调整探测器和待测目标的相对位置，配合一定的空间转换关系，实现了将复杂的三维空间位置关系转换到二维平面进行调节。

"Second Life is remarkably easy to work with, and is very popular,"

"第二次生命是显着容易的工作，并且很受欢迎，"

For example, we usually assume that materials are homogeneous and isotropic and free of internal defects or flaws.

为了得到适合有限元分析的模型，我们必须经过如图2所示的简化步骤。