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ABSTRACT Title of Theme: Numerical Simulation and Controlling of Dimples on the Process of Multi-Point Forming for Sheet Metal Specialty: Material Processing Engineering Faculty Adviser: Prof. Cai Zhongyi Multi-point forming is a new means for sheet metal forming.

论文题目:板材多点成形中压痕的数值模拟及控制专业:材料加工工程指导老师:蔡中义教授多点成形(Multi-point forming,简称MPF)是一种全新的板材成形方式。

Software Description: About Action Point Of Sale, This is a complete point-of-sale solution for small restaurants.

Action Point Of Sale 这是一款适用于小型饭店的电子收款机系统解决方案。

Because the carbonyl in its structure is with strongly absorb-electron effect, so it is a kind of non-proton polarity solvent with high boiling point, high flash point and low melting point, use conveniently for many processing operation such as filtration, distillation, solvent extraction, and so on; it is with very low toxicity, so the harm to human body is inappreciable, and reduce the environment pollution; due to its very strong dissolvability, it can dissolve organic matter, inorganic matter, resin, polymer, etc., and activate all kinds of reagent, mix to dissolve the other high boiling point solvents; it is with very good stability, it is stable under the hot strong alkali and acidity condition, it is with water-resistance and light, oxygen stability.

246℃ m.p:—20℃闪点121℃ flash point: 121℃分子式:C6H12N2O molecular formula: C6H12N2O 分子量128.18 molecular weight: 128.18 二、DMPU的化学性质 Chemical character of DMPU 其结构中由于羰基具有强烈的吸电子效应,因而它是一种非质子的极性溶剂,具有高沸点、高闪点、低熔点,在过滤、蒸馏、溶剂萃取等工艺操作中使用方便;毒性极低,对人体危害微不足道,也减少了对环境的污染;由于它具有极强的溶解性,能溶解有机物、无机物、树脂、聚合物等,并对各种试剂具有活化性质,还能与其它高沸点溶剂混溶;具有极好的稳定性,在热的强碱和酸性条件下都很稳定,还具有耐水性及对光、氧的稳定性。

This paper proposes an algorithm for point of collapse method to compute the static voltage stability limit point.

文章提出一种计算静态电压稳定极限点的崩溃点(Point of Col- lapse)算法。

Median Point - the axis passes through the median point of the selection.

Median Point---坐标轴通过选择体的中心点。

The Hot Keys which supported by this USB keypad areMouse Left Key, Mouse Right Key,Num Lock,Window Magnifier, Internet, Email, Media, Power Point, Word, Excel (Word, Excel and Power Point hotkeys only work with pre-Office 2007 suite),Play/Pause, Prev Track, Vol +, Stop, Next Track, and Vol -.

热键是通过这个USB键盘支持的鼠标左键,鼠标右键,数量锁,窗放大镜,互联网,电子邮件,媒体,功率点时,Word,Excel中(如Word,Excel和Power Point热键只能与前办公室2007套件),播放/暂停,昨日轨道,音量+,停止,下一曲,和卷-。

Aimed at the problem of choosing the initial value when the Newton method is used to compute the controlling unstable equilibrium point, a practical and rigorous solving scheme was presented: by identifying the controlling load bus of the given fault, and using the Thevenin equivalent circuit to represent the rest of the system at the state of the post disturbance stable equilibrium point, using the steady equivalent circuit to represent the induction motor in composite load, and then using the torque characteristics of induction motor, a point near the CUEP is gained to be the initial value. The second order normal forms was used to approximate the stable manifold of CUEP, and the local approximating boundary of the region of attraction of the post disturbance stable equilibrium point was gained. Then just by simulating the state of the system at the fault clearing time, the transient voltage stability of the system could be determined.

针对采用牛顿法求取故障后系统主导不稳定平衡点(controlling unstable equilibrium point,CUEP)存在的初值选取难题,提出一种实用但不失严谨的解决方案:通过识别给定故障的主导负荷母线,对主导负荷母线以外系统由故障后稳定平衡点处的状态进行戴维南等值,对负荷中感应电动机部分采用其稳态等值电路,再由感应电动机的转矩特性求得CUEP附近的一个点作为近似的CUEP,以此为迭代初值可靠求得CUEP;采用二阶正规型来近似CUEP的稳定流形的方法求得近似的局部吸引域边界;由仿真得到故障清除时刻系统的状态并根据该状态是否位于吸引域内判断系统的暂态电压稳定性。

Based on the analysis of the affected extent of the neutral-point potential by every space vector on all kinds of voltage and current conditions the concept named neutral point control grade was proposed for the first time in this paper. The calculation formulas of NPCG were presented as well. Based on NPCG, a novel modulation scheme called optimized 3D space vector modulation (O3DSVM) scheme was proposed in a-b-0 coordinates based on the translation principle of axes, by which the space vectors with higher NPCG values are selected to synthesize the object vector to suppress the unbalance of the neutral-point potential.

该文通过对各种电流电压状态下每个三维空间矢量对直流中点电位的影响进行分析,提出了"中点控制度"(neutral-point control grades,NPCG)的概念,并给出了NPCG的计算公式;基于NPCG,在a-b-0坐标系下提出一种基于坐标平移原理的新型"三维矢量优化选择调制策略"(optimized 3D space vector modulation,O3DSVM),该调制策略能优化选择NPCG值较高的矢量以合成目标矢量,从而达到最大程度控制直流中点电位偏移的目的。

Point/Snap toggle Allows you to choose between Point Mode (exact point of cursor click determines point selected) or Snap Mode (point is determined by, or "snaps to," nearest endpoint of an existing item to cursor click) while drawing .

点击/捕捉切换当你正在绘图的时候,允许你在 Point Mode 点模式(精确选择鼠标指针所单击的点位置)和 Snap Mode 捕捉模式(点位置的选择被确定在距离指针单击位置最近的一个现有内容上的一个距离指针单击位置最近的端点)之间自由切换

If the Point/Snap button in the Status Bar is set to Snap, the left mouse button will snap to the closest point (either an end point or a line intersection) when clicked in the Design Document Window.

如果在状态栏上的 Point/Snap 点击/捕捉按钮被设置为捕捉模式,当在文档设计窗口中单击时,鼠标左键将捕捉最近点。

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相关中文对照歌词
Two Point Four
The Sharpest Point
Point The Finger
Point Of Know Return
The Point Of It All
Point Of Safe Return
Breaking Point
19 Turning Point
You Miss The Point Completely I Get The Point Exactly
From Point A To Point B
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The difference between him and the others forced me to be less partial.

也这是因为这种区别,让我在他和其他孩子之间没有偏爱任何人。

I decided to be frank in rejecting the proposal.

他说,他准备直率地拒绝接受这个建议

One downside: the iPhone doesn't have a built-in slot for a stylus.

不过,还有一个问题:iPhone没有内置的手写笔槽。