线

Being formed by linear grain curved surface, helicoid can be expressed by a group of simple lines. Writing two equations of inside and outside of the helicoid, getting any one of simple line′s equation and from which getting the coordinations of two end points by projection transformation, the CAD system of helicoid is achieved. It...

由于螺旋面为直纹曲面，因此可用它的一组素线表示，用极坐标的形式写出内外两条螺旋线的方程，求出任一素线的方程，并通过投影变换求得素线上两端点的坐标矩阵，进而设计出螺旋面的CAD系统，并将其应用于实践，为设计优化决策提供有力的证据。

The objective of this study is to introduce briefly the basic concept and expression of isotope and the theory of isotopic hydrograph separation,to review the advantages and disadvantages of various hydrograph separation methods which are applied all over the world and to introduce two-component and three-component isotopic hydrograph separation models in details.

简要介绍了同位素的基本概念、表示方法以及同位素示踪流量过程线分割的基本原理。综述了国内外关于流量过程线分割各种方法的优缺点，并对二水源同位素过程线分割模型和三水源同位素过程线分割模型进行了详细介绍和推导。

Analyses of loci in the π plane and meridian line s show that the parabolic and hyperbolic type failure envelopes have no influences on the shape of the.

对改进式所作的π平面极限线和子午线分析表明，采用抛物线和双曲线形强度包络线基本上不会改变原准则在π平面上的极限线形状，但子午线由直线改为曲线，极限面在主应力空间内分别为抛物面和双曲面，其锥顶距坐标原点也比采用线性强度包络线的要小。

In this article, the stress inside a quantum-wire structure is studied. Based on the derived expression of the stress inside a quantum-wire structure with arbitrarily shaped cross section, the analytical solution of the stress inside a trigonal quantum-wire structure in an infinite matrix is obtained.

研究了晶格失配和热失配在半导体量子线结构中所产生的弹性场，在分析圆柱形量子线结构弹性场的基础上，推导得到了任意截面形状量子线结构解的一般形式，并给出无限大基体内横截面为三角形量子线结构的解析结果。

The 90 and 180 phase shift bits are of reflection type, using Lange coupler to realize the separation between the incident and reflection signals. According to process rules of the GaAs MMIC product line, we properly designed the circuit layout. In order to reduce the overall chip size, the transmission lines are folded with sufficient spacing to avoid interline coupling.

结合实际MMIC工艺线，合理设计移相器电路版图，折叠微带线并留出足够大的线间距，以避免线间寄生耦合的发生，并折叠兰格耦合器使90°和180°移相位的尺寸与其它相位的芯片尺寸保持一致。

This paper presents synthetic detecting fault feeder method based on the method of summation of mutual integral of transient current for intermittent arc earth fault and the method of summation of admittance mutual difference and fused current method for steady earth fault.

提出了基于电弧接地故障的暂态电流互积求和选线法和针对稳态接地故障的导纳互差求和选线法和融合电流选线法的综合选线方法。

Using the approximation of steady collisional-radiative equilibrium model, the interstage line intensity ratios of the K-shell lines of aluminum were given as a function of electron temperature and density.

利用稳态碰撞辐射平衡近似条件下的等离子体光谱辐射动力学模型，给出了Al激光等离子体Ly β线与He β线强度比以及Ly γ线与He γ线强度比与电子温度的函数关系。

Type IB: Isocline is convergent towards inner arc at a right angle to the fold.

根据等斜线的收敛层度，再细分为三个亚型：IA型：等弧线向内弧强烈收敛，各线长短判别极大，内弧曲率远大于外弧曲率，为典型的顶薄褶皱；IB型：等倾斜线向内弧收敛，并与褶皱面垂直，各线长短大致相等，褶皱层真厚度不变，内弧曲率仍大于外弧曲率，为典型的平行褶皱；IC型：等斜线相内弧轻微收敛，转折端等倾斜线比两翼附近的要略长一些，反应两翼厚度有变薄的趋势，内弧曲率略大于外弧曲率。

Wire jump prevente : The wire jump preventer (wire roller-NT series) is used for a radical change of direction and adequate guidance and prevent the wire jumping during the winding process.

防跳线器：防跳线器用于漆包线大幅度改变方向及作适量导向和防止绕线过程中的跳线。

Proposed rail lines include: a northern New England line; an Empire line running east to west in New York State; a Keystone corridor running laterally through Pennsylvania; a major Chicago hub network; a southeast network connecting the District of Columbia to Florida and the Gulf Coast; a Gulf Coast line extending from eastern Texas to western Alabama; a corridor in central and southern Florida; a Texas-to-Oklahoma line; a California corridor where voters have already approved a line that will allow travel from San Francisco to Los Angeles in two and a half hours; and a corridor in the Pacific Northwest.

拟议的铁路线包括：新英格兰北部线；一个帝国线东西在纽约州；走廊运行的基石，通过横向宾夕法尼亚州；一个主要芝加哥枢纽网络，一个东南亚网络连接哥伦比亚特区佛罗里达州和墨西哥湾沿岸地区；海湾海岸线从西部得克萨斯州到东部阿拉巴马；在走廊中部和南部的佛罗里达州；德州至俄克拉何马州线；加州走廊，在那里选民已经批准了线，使旅游从旧金山到洛杉矶的两个半小时；和一条走廊，在西北太平洋。

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。