波曲的

For these two effective focal lengths, the spots on the image surface at zero view field, 0.7-view field and full view field are all inside the airy disc. The system MTF curve of each effective focal length are accordance with the corresponding diffraction limits curve. The biggest wave aberration is smaller than 1/4 wave lengths. The maximum field curvature and maximum f-theta system distortion respectively satisfies the precision demand of the laser marking machine in China.

系统像面在0视场、0.7视场和全视场的光斑都落在相应的爱里斑以内，系统的MTF曲线接近相应的衍射极限曲线，最大波像差小于四分之一波长，系统的最大场曲和最大f-theta相对畸变都很好地满足了国内激光打标机的精度要求。

First of all, the report introduced evolution, achievments and problems in the study of anisotropy in the inner of earth. The first-order hyperbolic system of equations is work out, which is used to describe the wave motion in 2D transversely isotropic media. Utilizing the characteristics of free-divergence, We have imposed MacCormack theme that is used to simulate multicomponent records in anisotropic media and have developed a fast high order vectorized finite-difference algorithm adapted for the vector supercomputer.

本文首先阐述了地球内部介质各向异性研究的沿革、成就和问题，接着给出了描述二维横向各向同性介质中波动的一阶双曲型方程，利用其自由发散特性，构制了各向异性介质中多波多分量地震记录数值模拟的MacCormack算式，导出了适用于并行计算的二维横向各向同性介质中波动的有限差分模拟算子，该算子具有可并行化计算、相位差小等优点。

1St Week: A general introduction to the nature and contents of the course; an investigation of students' acquired knowledge of literature in general; a brief introduction to African-American literature 2nd and 3rd Weeks: Rediscovering an Invisible Culture (Why Black culture had been unknown and unobserved for several decades; how it came to be rediscovered ) 4th to 6th Weeks: Double Consciousness (the marginal perspective in Language, Oral Culture, Folklore and Religion); Reading representative works by three Black writers of racial consciousness: Douglass, Washington and Bu Bois 7th to 9th Weeks: Minstrelsy (Imitation, Parody and Travesty in Black-White interaction rituals 1830--1920); Reading the novel about the Black life: Uncle Tom's Cabin 10th to 12th Weeks: Social Mobility and Cultural Stigma: The case of Chicago Jazz 1920--1930; Reading poems by Hughes and novels by Wright 13th to 15th Weeks: Oral Tradition and the Quest for Literacy: The crisis of Black writers from Philips Wheatley to Ralph Ellison; Reading the masterpiece of Ellison 16th to 18th Weeks: Contemporary Afro-American Culture: the sixties and seventies (efforts on reconstructing the Black identiy and Black history); Reading novels by Morrison

第1周：介绍课程性质、内容，了解学生相关文学背景，简要概括黑人文学历史第2-3周：再现黑人文化（黑人文化长期被掩盖的事实和原因，重新被发现的原因和过程）第4-6周：双重意识（语言、吟唱文学、民俗民谣、宗教的边缘化），阅读黑人种族意识三代伟大启蒙家道格拉斯、华盛顿、杜波伊斯的代表作第7-9周：吟游文学（黑人与白人的文化互动过程中的模仿、戏仿、曲仿），阅读第一部反映黑人生活的小说《汤姆叔叔的小屋》第10-12周：社会动荡与文化耻辱（芝加哥爵士乐的兴起、流行和影响），阅读休斯和赖特的代表作第13-15周：口头文学传统与争取教育权利的斗争（从惠特利到埃里森的黑人作家危机），阅读拉尔夫·埃里森的代表作第16-18周：六、七十年代以来的美国黑人文化（重建身份和重建历史的努力），阅读莫里森的代表作每位参加该课程学习的学生均须严格出勤，按时完成学读任务，每学期主持两次小型（10分钟）学术报告，第一次针对老师推荐的作家作品做一个专题报告，第二次针对自己的学期研究计划做一个选题前瞻性和可行性报告。

Leaves dark to bright green, with inconspicuous veins, surface often crinkled, villous to strigillose, sessile to shortly petiolate; rosette blade 13-30 × 3-5 cm; cauline blade narrowly elliptic to lanceolate or oblanceolate, 5-15 × 2.5-4 cm, base attenuate to narrowly cuneate, margin remotely dentate, usually undulate toward base, apex acute to subobtuse.

把深色的留给翠绿，具不明显脉，通常皱曲，对具短糙伏毛，无梗在具短叶柄具长柔毛的表面；莲座丛叶片 13-30 * 3-5 厘米；茎生叶狭椭圆形到披针形或者倒披针形， 5-15 * 2.5-4 厘米，基部渐狭对狭楔形，边缘稀疏的具牙齿，通常波状对于基部，先端锐尖的对微钝。

Based on the hydroelastic response theory, the motions of the VLFS are analyzed in the dissertation, and then the velocity potential of fluid and the velocity potential of deflection wave of VLFS are solved.

本文在水弹性响应理论的基础上对超大型浮体结构的运动进行了分析，并求解出流体的速度势和浮体挠曲波速度势。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。