扇形的

The first part is preface, on the basis of expounding the background, the purpose, the meaning and the thinking of the thesis study, briefly introduce the research achievements of domestic and international urban spatial structure; the second part is summary, expatiate on the connotation, component, research span and space type of urban spatial structure; The third part is theory foundation, mainly introduce the three classical models of city spatial structure in the west country (concentric circles mode, fan-shaped mode and multi-core mode) and the relative city development theories (growth pole theory, dot-axis theory, core-fringe theory, metropolis circle theory and city space evolution theory); The fourth part is general situations of study region; The fifth part is the analysis of Lanzhou city spatial structure evolution, along the historical venation Of city development, on the basis of analyzing industrial structure change, focus on and sumup the characteristics of spatial development and form, meanwhile, analyze factors which influences the spatial development; The sixth part is the analysis of Lanzhou city spatial development trend, put forward the development models of Lanzhou city spatial structure from three space aspects(the core city, the city, region) in the future, they are group gobbet structure, fingers structure, circle structure; The seventh part is to mainly put forward the development strategies for the different spatial structure models.

第一部分为前言，在阐明论文研究背景、目的及意义、思路的基础上，简要介绍了国内外城市空间结构相关研究成果；第二部分为概述，对城市空间结构的内涵、组成要素、研究尺度及其空间类型作以介绍；第三部分为理论基础，主要是对西方城市空间结构的3大经典模型(同心圆模式、扇形模式和多核心模式)以及与本研究相关的城市空间发展理论(增长极理论、点轴理论、核心——边缘理论、都市圈理论和城市空间演化理论)的介绍；第四部分为研究区概况，主要是对研究区域范围的界定及其社会经济发展概况介绍；第五部分是兰州城市空间结构演化分析，顺着兰州城市发展的历史脉络，在分析产业结构变动的基础上，着重对城市空间发展及其形态特征进行归纳总结，并分析了空间发展的主要影响因素；第六部分是兰州城市空间发展趋势分析，从中心城市、市域、区域3个空间层面上提出未来兰州城市空间结构的不同模式，即组团结构、指状结构、圈层结构；第七部分是城市空间发展策略，针对不同的城市空间发展模式提出一些对策建议。

For the compressible materials, in order to satisfy the higher-order compatibility equation of the rate of deformation in the centered fan sector, which is a quite difficult problem unresolved in the previous studies, a particular term must be added to the expansions of the stress components in the regular logarithmic power series adopted by many researchers before. A higher-order near tip field with tangential velocity jump ahead of the crack tip is derived first, of which the dominant terms are the solution widely accepted.

对可压缩材料，本文首先采用非规则的对数幂级数渐近展开方法，克服了过去研究中存在的中心扇形区变形率协调方程的高次渐近式不能被满足的困难，并得到了一个切向速度在裂尖前方存在间断的高阶渐近解，该解的主项就是目前被广泛接受的关于可压缩材料的尖端场解。

The detailed comparisons between the higher—order near tip solution and the well—known modified Prandtl field are also given in this paper.For the compressible materials, in order to satisfy the higher-order compatibility equation of the rate of deformation in the centered fan sector, which is a quite difficult problem unresolved in the previous studies, a particular term must be added to the expansions of the stress components in the regular logarithmic power series adopted by many researchers before. A higher-order near tip field with tangential velocity jump ahead of the crack tip is derived first, of which the dominant terms are the solution widely accepted.

对可压缩材料，本文首先采用非规则的对数幂级数渐近展开方法，克服了过去研究中存在的中心扇形区变形率协调方程的高次渐近式不能被满足的困难，并得到了一个切向速度在裂尖前方存在间断的高阶渐近解，该解的主项就是目前被广泛接受的关于可压缩材料的尖端场解。

Hutuo group of greenschist facies of the mainly sedimentary rocks appears a tectonic style of the huge invert-fan synclinorium in Wutaishan, illustrates the material components of the above crust and inner continental orogenesis. It is a typical example of the tectonic—magma event in the world at 2100—1800Ma, would be a new research hot after Rodinia.

以沉积岩为主的绿片岩相变质的滹沱群，在五台山的构造样式为巨型反扇形复式向斜，代表上地壳的物质组成和陆内造山作用，是研究全球范围内的2100-1800Ma的构造岩浆事件的典型实例，有望成为继Rodinia超大陆研究之后新的研究热点。

Initially the following measures are taken for association of the angle positions to physical reflectors, and for determination of the position of the vehicle (10): i at least three angle values with a suitable distribution over the search sector is selected, ii the angle values are associated to reflectors and a position is determined for the vehicle on the basis of the known position of the assumed reflectors, iii if the vehicle position determined in this way is within a certain part of the transport area the other angle values are associated to reflectors, iv for each angle value, existing deviation is determined between detected angle values and angle values expected between the vehicle position and known reflectors, v the measures taken are repeated for each possible combination of selected angle values.

最初使用下列步骤使这些角位与反射器关联以便确定车辆（10）的位置：i）在该搜索扇形上选择至少三个合适分布的角度值，ii）使各角度值与各反射器关联，根据假设反射器的已知位置确定车辆的位置，iii）如果如此确定的车辆位置在该运输区的某一部分中，则使其他角度值与反射器关联，iv）对于每一角度值，确定所检测角度值与车辆位置与己知反射器之间预期角度值之间的偏差，v）对于所选择的角度值的每一种可能组合反复进行这些步骤。

The first one is to generate the circle for each borderline segment of the component by considering the segment length and the prescribed tolerance value. If this is not the case, the borderline segment will be equally divided into halves until the obtained circle satisfies the tolerance value over the whole borderlines of the component. The basic idea of the last two algorithms aims at covering the domain occupied by the component as much as possible. The circle generation is carried out sequentially from salient angle to the sector formed by the salient angle till the uncovered borderline segments of the component. Particularly, the three-step algorithm with gap allows that the generated circles are distributed with gap along the component contour.

二分法利用组件各边长度和设置的容差大小得到该边的候选包络圆，若该圆不满足组件所有边的容差要求，则将该边不断地对分，直至所得到的包络圆满足各边的容差要求；三步划分法和带间隙的改进三步划分法则以组件区域为划分对象，依次对组件多边形凸顶角、凸扇形区和多边形各边剩余线段划分包络圆，且带间隙的改进三步划分法则允许包络圆在组件边界上以适当的间隙分布。

The rate of subsidence has been decreasing from area near vertex of delta to the coastal zone and some place is even rising, particularly in the early formed area. What is the different in the coastal is that the rate of subsidence is still high and can sustain a long time. This is because the land subsidence in the delta is mainly caused by the consolidation of sediments if there is no human activity. Especially in the newly formed area, Qingshuigou sub-delta, the rate of subsidence was more than 50 mm/a in the begining and now is still higher than 10 mm/a. When the newly sediments discharged by the Yellow River landed on the subaquatic delta, its load can drive the concolidation of the silt, which is on the surface of the Bohai seafloor. The rate of consolidation of the silt will be decreasing quickly in the first years, but still a long time in the later time with a slow rate.

研究结果表明：现代黄河三角洲在以宁海为顶点的河口扇形区域，近期均经历了不同程度的地表下沉过程，但是随区域地理位置和时间的不同，地表变化空间差异性比较明显；三角洲顶点附近区域的下沉速率自上世纪末开始逐渐减小，后期甚至出现轻微的抬升；滨海沿岸附近地区的地表形变特征相对比较复杂，各期叶瓣相互叠置及其各类沉积物的不均匀分配，使由沉积物自然固结压实引起的地表形变具有显著的空间差异；目前，除清水沟流路叶瓣表现为快速沉降以外，其它滨海沿岸区基本上都表现为微弱的下沉。

Leaves needlelike, slender or stout, straight or twisted, triangular, flabellate-triangular, or semiorbicular in cross section, stomatal lines several, on 1, 2, or all surfaces, vascular bundles 1 or 2, resin canals 2-10 or more, marginal or median, rarely internal, base enclosed by persistent or deciduous, membranous sheath. Pollen cones usually borne in spikelike clusters at base of 1st-year branchlets, sessile, cylindric or ovoid; pollen 2-saccate.

叶针状，纤细的或粗壮，直的或扭曲，三角形，扇形三角形，或半圆形在横断面上，气孔线数个，在1，2上，或全部表面，在第1 年的小枝，无梗，圆筒状的或卵球形的穗状的簇生在基部里的雄球花通常着生；花粉2囊。

The timepiece with a fan-shaped hand-motion display mechanism according to the invention includes a column wheel having a cam outer circumference, a swingable hammer in contact with the cam outer circumference of the column wheel, and a small day indicator that rotates in response to the swing movement of the hammer.

根据本发明的具有扇形指针运动显示机构的时计包括，具有凸轮外周的圆柱轮，与该圆柱轮的凸轮外周相接触的可摆动锤，和响应该锤的摆动而旋转的小星期指示器。

Was founded in 1999, its predecessor, Universal Mold Factory Cixi are experienced 8 years of arduous pioneering, in 2007, renamed as Cixi Ci Yu Motor Parts Factory, the company in the united struggle of all the employees, in the vast numbers of customers still do not transfer the trust and support, Tsz Yuk motor has been rapid and steady development, has successfully developed a red double-rotor slot mode, blanking duplex mode, the entire complex mode rotor, pole piece double dies, compound dies chip Yoke , fan-shaped tablet die complex, high-speed machine Notching Notching told alloy molds for dozens of special silicon steel motor dies, electrical silicon steel varieties covering most of the production tooling required type, in the years of production practice, accumulated a wealth of production experience, forming a complete set of processing technology.

慈钰电机公司创建于1999年，其前身是慈溪环球模具厂，经历8年的艰苦创业，于2007年更名为慈溪慈钰电机配件厂，公司在全体员工的齐心拼搏下，在广大客户始终不移的信任和支持下，慈钰电机得到了迅速而稳定的发展，先后成功开发了定转子复式冲槽模，复式落料模，定转子全复模，磁极片复式冲模，磁轭片复式冲模，扇形片复冲模，高速冲槽机专用合金告诉冲槽模等几十种电机硅钢片专用冲模，品种覆盖电机硅钢片生产需要的大部分模具种类，在多年的生产实践中，积累了丰富的生产经验，形成了一套完整的加工工艺。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。