查询词典 geometrical cross section

Taking into account the influences of scatterer geometrical shapes on induced currents, an algorithm, termed the sparse-matrix method, is proposed to calculate radar cross section of aircraft configuration.

论证了散射体几何形状对感应电流的影响规律，并基于飞行器几何外形特征和矩量法，提出了一种用于飞行器雷达散射截面计算的高精度快速算法。

An equal cross-section blade was investigated and a finite element model was built parametrically. Geometrical parameters (such as length, width and thickness), material parameters (such as young's modulus and density) and speed of blade were considered as input random variables while the static frequencies and dynamic frequencies were output random variables. Combining the finite element method, response surface method and Monte Carlo method, the statistical properties and cumulative distribution functions of static frequencies and dynamic frequencies were obtained. Probability sensitivities analysis, which combined the slope of the gradient and the width of the scatter range of the random input variables, was applied to quantitatively evaluate the sensitivities of static frequencies and dynamic frequencies with respect to the random variables. The Scatter plots of structural responses with respect to the random input variables were illustrated how to adjust the values of the static frequencies and dynamic frequencies by changing input random variables.

文中以某试验台用汽轮机等直叶片为研究对象，考虑几何参数、材料参数和转速的随机性，通过有限元参数化建模，将确定性有限元方法、响应面方法和Monte-Carlo模拟法相结合，从而获得了叶片静频、动频的统计特性和累积分布函数；同时考虑随机变量的梯度和离散范围对静、动频的影响，通过概率敏感性分析，定量地判断出叶片静、动频对随机输入变量的敏感性；通过绘制叶片静、动频与输入变量的散点图，定量地分析了如何改变随机变量以调整静、动频率的方法。

The invention comprises a main body of the reactor, the dynamic heat pipe, fins, a turbine, a motor, a transmission mechanism and a cold air jacket; the segment of the dynamic heat pipe in the main body of the reactor is a heat absorbing section; the segment of the dynamic heat pipe outside the main body of the reactor is a heat release section; the main technology characteristics are that the heat absorbing section of the dynamic heat pipe is connected with a central stirring shaft; and the heat absorbing section is used as a mixing impeller blade.

本发明包括反应器主体、动态热管、肋片、涡轮、电机及传动机构、冷风夹套，动态热管在反应器主体内的一段为吸热段，在反应器主体外的一段为放热段，其主要技术特征在于动态热管的吸热段与中心搅拌轴连接，吸热段作为搅拌桨叶。

Seed industry of large turn, it is big trend to grow industry develop that almightiness turn; The farm crop seed industry turns and can make section taught to grow , the seed produe, sprocess and promote to expand the section the close uniting with the agriculture, becoming the technology lead first the type seed industry group, uniting the developmend meet the next the new species that modern agriculture need when producing , new technique new product of market mechanism term establishing to rise to face to the domestic and international market teach , heavy, push, the integral whole of turns of carry camp mechanism, end guarantee to teach to grow the section can stabilize a ground of growing the high producing, superior quality, many antis of new species, good and new species in distribution in section in seed.

种业的大型化、全能化是国际种业发展的大趋势；农作物种子产业化可以使科研育种、种子生产、加工、经销和农业推广部门紧密联合成科技先导型种子产业集团，联合开发符合市场机制条件下现代农业生产所需要的新品种、新技术、新产品，建立起面向国内外市场的育、繁、推、销一体化的运营机制，最终保证育种科研能稳定地培育出高产、优质、多抗的新品种，种子部门经销优良的新品种。

Based on the PTB study situation of the studied area, two terrestrial sections and one marine-terrestrial section were chosen for the sedimentary and sequence stratigraphy study. The former are Chahe section and Zhejue section in Weining, Guizhou, and the latter is Mide section in Xuanwei, Yunnan. The definition and correlation of the TPTB were discussed based on the results of biostratigraphy, isotope stratigraphy, geochemostratigraphy, and molecule stratigraphy. Thus, it supplied a perfect base for the establishment of the TAGSSP in the area.

针对研究区二叠系—三叠系界线剖面研究现状，选择了二条陆相剖面，既贵州威宁岔河剖面和哲觉剖面，一条海、陆交互相剖面即云南宣威密德剖面，开展了有关沉积学和层序地层学方面的研究，并结合生物地层、同位素地层、地球化学地层和分子地层等资料探讨了研究区二叠系—三叠系界线的划分与对比方案，从而为在该区争取建立陆相二叠—三叠系辅助层型剖面和点打下了良好基础。

Chapter Five shows the case study of the beauty of math in high school teaching. Conic section is taken as an example to unearth the beauty of mathematics in from the following three aspects: 1. the language beauty of conic section reveals the external formal beauty; 2. the methodological beauty and the logical beauty of conic section reflect the internal rational beauty; 3. the beauty of mathematics in conic section reveals the new value in internal knowledge structure of textbooks. Moreover, the application of the beauty of mathematics in high school math teaching is also discussed from the following four points of view: the pursuit of conciseness, the construction of symmetry, the utilization of unity and the discovery of uniqueness.

首先，以圆锥曲线教学为案例来挖掘中学数学教学中的数学美，具体从三个层次探讨①圆锥曲线语言之美，是数学美的外在形式美具体展现；②圆锥曲线方法美、逻辑美，是深层次数学美的内在理性美的反映；③在圆锥曲线的教学过程中，利用其数学美处理教材，揭示内在知识结构的新价值；其次，提出数学美在中学数学学习中的具体案例运用，并具体从追求简洁性、构造对称性、利用统一性和发现奇异性四个方面来举例探讨。

Apart from the preface, the paper can be divided into four sections. Section 1, studies in four aspects: the basis characteristic of the tradition textile industry, the textile industry and regional economic, the advan-ment of the science and technology and the moderniznation of the textile industry. Section 2, addresses the textile of YunNan was in hot water in ninety ages, and why, thereout adopt a series of measures. Section 3, analyses in the textile of VunNan"s chances and challenges in three aspects: acceding to the WTO, actualizing of"the westwards great exploitation and the course of market. Section 4, according to the deciding route of development tactic, bring forward the textile of YuNanThow to debouch the hot water, the emphases and the composition in reason of the development for the future.

全文除序言外，共分四部分：第一部分：主要从传统纺织工业的基本特点、纺织业与区域经济、科技进步与纺织工业现代化三个方面进行了分析；第二部分：从云南纺织工业90年代陷入困境，为何陷入困境及采取的措施进行了分析；第三部分：对加入WTO、实施西部大开发、市场化进程带来的机遇与挑战进行了分析；第四部分：按照已定的发展战略思路，提出云南纺织业如何走出困境，二次创业，今后发展的重点和合理布局。

In order to compensate for the difference in the height of the cold end center section and the hot end center section and the resulting difference in the distance between the hot and cold center section and between the hot and cold connecting plate duct assemblies, the main support pedestal panels include offsets which extend downwardly along the sides of the cold end center section to meet with the cold end connecting plate duct assemblies.

为了补偿冷气端中心部分与热气端中心部分的高度差，以及由此带来的热气和冷气端中心部分的距离差以及冷热气端连接板管道系统间的距离差，主承重支座板上有一偏移量，它沿着冷气端中心部分的侧面向下延伸直到与冷气端连接板管道系统相连。

If you are involved in any area of infection,blood,respiration,ICU ,apparatus transplant,skin section,experiment section,internal medicine,surgery,woman section,children section,druggery research,microorganism research and related member from other areas,you are welcome to join the conference and contribute.

对老龄化进程新的科学理解对欧洲老公民改善健康、独立自主和基本生活条件的机遇起了很大的启迪作用。这个会议将是唯一聚拢药学、生物、社会科学、科技和财政等工作的座谈小组，开启使人们意识到欧洲生物学老龄化研究的讨论。

In section one, we introduce some background of the topic, in section two we review some basic and recent results about the structure and hierarchies of the computably enumerable degrees which are closely related to our topic- the algebraic structure of the plus cupping Turing degrees, in section three, we outline the basic principles of the priority tree argument, one of the main frameworks and tools of theorem proving in computability theory, and in section four, we prove a new result concerning the algebraic structure of the plus cupping Turing degrees that there exist two computably enumerable degrees a, b such that a, b ? PC, and the join a V b of a and b is high.

度结合为0′。本篇论文分为4个部分：第一部分介绍了这个领域的一些背景知识；第二部分主要回顾了前人在研究可计算枚举度的结构和层谱时所取得的一些基本和最新结果，这些结果与我们的主题—加杯图灵度的代数结构密切相关；在第三部分中，我们概要的描述了优先树方法的基本原理，此方法是可计算性理论中定理证明的一个重要框架和工具；第四部分证明了一个加杯图灵度代数结构的新结果：存在两个可计算枚举度a，b，满足a，b∈PC，而且a和b的并a∨b是一个高度。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48