直线的

This paper investigates the converse theorem of rectangular projection theorem in descriptive geometry,and furthermore supplements and confirms another converse theorem,If the projection of two lines intersecting vertically fo rms a rectangle on a certain projecting plane,at least one line of the two lines is parallel to the projecting plane.

通过对《画法几何学》中直角投影定理的逆定理的研究，得出："若垂直相交的两直线在某一投影面上投影成直角，则该两直线至少有一条直线平行于该投影面"的推论。

The results indicate that lgG'-,lgG-lgw relation-ship curves look as straight lines on the double logarithmic scale at lower mas fraction of fumed silica.In the higher angular frequency region,therer is a slight downward discrepancy for the curves from the straight line.With the increase of the fumed silica mass fraction the lines are upward translation,but the slopes decrease.

发现当气相二氧化硅质量分数最小时， lgG'-lgG"-lgw 相互关系基本上呈直线，在高频部位 lgG'， lgG"开始微微向下偏离直线形态；随着气相二氧化硅质量分数的增加，直线整体向上平移的同时谢率降低。

Lines are induced on the surface of a photosensitive glass by focused femtosecond laser transverse writing with scanning velocity in a wide range of 40-1800 μm/s. The formed lines are analyzed using scanning electron microscope and optical microscope.

利用聚焦飞秒激光的横向直写方式，采用宽的扫描速度范围(40-1800 μm/s)，在光敏玻璃表面上诱导了直线结构，并扫描电子显微镜和光学显微镜分析了形成的直线，发现随着扫描速度不同，形成的直线具有三种不同的形貌。

Knowledge and skills: Students should be able to 1 determine the position relationships between lines and planes: 2 find the point of intersection of a line and a plane;3 find the angle between a line and a plane.

根据方程确定直线与平面的位置关系； 2）根据方程找到直线与平面的交点； 3）求出直线与平面的夹角。

The projection sequence of plane graphs apex and relationship of the sequence and plane faces were discussed.

阐述了空间直线与平面相交，彼此相对位置的不变性，提出并论证了各种位轩直线与平面相交，直线在相邻两投影面上可见性的投影规律。

Based on Pseudo-linearization and least square methods, the bearings-only target motion problem was studied under the conditions that the target takes uniform rectilinear motion in 2-dimensional space, the single observer takes uniform rectilinear motion first, and then takes rectilinear motion with constant acceleration. The necessary and sufficient observable conditions, some unobservable conditions are gained.

基于拟线性处理和最小二乘方法，在目标作匀速直线运动，单观测站作匀速直线运动，进而作匀加速直线运动的机动情形下，研究了二维纯方位系统的可观测性，得到了系统可观测性的充要条件以及系统的某些不可观测的条件。

In order to look for fast calculation model of a linear oscillation motor, which can express the transitive relation between parameters and performance. The basic mathematic model of a linear oscillation motor is established by finite analysis method and the regression modeling method for the support vector machines is introduced. Then, the SVM calculation model is set up. A shortcut online calculation method is provided for the process of the parameter optimization of linear motors.

为了寻找反映直线振荡电机参数与性能输入输出传递关系的快速计算模型，利用有限元分析法，建立了直线振荡电机非参数建模的基本数据计算模型，根据基本数据计算模型，引入支持向量机(Support Vector Machines， SVM)非参数回归建模方法，建立了用于直线振荡电机参数与性能之间输入输出传递关系的SVM计算模型，为电机参数优化过程提供了方便快捷的在线计算方法。

Institute of Power and Electronic Technology, Naval University of EngineeringAbstract : Due to the existence of long unexcited primary between the import and export of linear induction motor with multi-segment primary, the static longitudinal end effect are different comparing with conventional LIM.

多段初级直线感应电动机(linear induction motor，LIM)由于在通电初级绕组外还存在较长的不通电初级铁心，因此这种结构的直线感应电动机的磁场边界条件与传统直线感应电动机不同，静态纵向边端效应对电机性能的影响也存在较大差异。

Including linear bearings, linear guide, straight axle, ball screw, spline shaft, oil bearing, bearing joints, locking nut, coupling, pneumatic / hydraulic / electrical devices, X-Y-Z platform, sliding Unit, cross-roller guide, all kinds of casters, as well as various types of high-speed motor with frequency, widely used in woodworking machinery, and other carvings of CNC machine tools on the main axis, its high-performance, low prices, is your An ideal choice.

包括直线轴承、直线导轨、直线轴、滚珠丝杠、花键轴、含油轴承、关节轴承、锁紧螺母、联轴器、气动／液压／电器元件、X —Y—Z平台、滑动单元、交叉滚子导轨、各种脚轮等，及各种类型的高速同频电机，广泛用于木工机械、雕刻机等CNC数控机床的主轴上，其性能高，价格低，是您的理想选择。

The relations between the simulation circuit parameters and the linear motor parameters were achieved by analyzing the equivalent circuit of the linear motor and the simulation circuit of piston displacement self-sensor.

通过分析直线压缩机的直线电机的等效电路和活塞位移自传感器的模拟电路，得出了模拟电路参数与直线电机参数之间的关系。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。