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In this paper,the development status of direct-driven variable-speed constant-frequency permanent magnet wind-power generators around the world was introduced.

介绍了国内外直驱变速恒频永磁风力发电机的发展应用状况，对发电机的结构、特点和转子磁钢进行了描述，针对它的特殊结构对其电磁系统设计方法及电力电子变换器进行了研究，最后指出了直驱变速恒频永磁风力发电机的发展趋势和研究方向，以期推进我国风力发电机的研究和应用。

Direct-driven non-linear proportional valve that the flow characteristic curve was non-linear was designed to reduce hydraulic impact in the reversing process of proportional reversal valve.

为了进一步降低比例换向阀换向时产生的压力冲击，设计了流量特性曲线为非线性曲线的直动式非线性比例换向阀，在AMESim中建立了直动式非线性比例阀及试验台仿真研究模型。

Comparing comprehensive ly the present various current converting circuits, it is proposed an design structure of direct-driven wind power generation current converting systems in megawatt level.

摘 要：在综合比较当前适合直驱型风力发电机组的各种变流电路的基础上[1~ 2]，提出了一种兆瓦级直驱型风力发电变流系统的设计结构，即采用不控整流+升压斩波+SPWM逆变的变流器将电机发出的电能转换为可接入电网的恒频恒压的交流电。

Considering the geographic dispersive distribution of large-scale offshore wind farms and the feature that doubly-fed wind power generators or direct-driven/ hybrid-driven wind power generators are mainly adopted in them, a power transmission topological structure of VSC-HVDC system corresponding to the connection offshore wind farms with power grid is proposed, and related control strategy is designed.

针对大规模近海风电场地理分布上高度分散以及主要采用双馈式或直驱/半直驱式风电机组的特点，提出了相应的电压源型变流器的高压直流(voltage source converter based HVDC，VSC-HVDC)并网传输拓扑结构，并设计了相应的控制策略。

Cutting Tool: Drills--Straight Shank Drill,Drill for Stainless Steel, Noss Drill, Drill Blank, Taper Shank Drill...etc.

切削工具：钻头--直柄钻头、钴钢直柄钻头、诺氏钻头、圆棒、斜柄钻头。。。。

Our products are: the overall alloy straight shank twist drill, crude shank twist drill, straight shank keyway milling cutter, end mill, ball milling insert, inlay alloy spiral end mill, reamer, such as inlay alloys.

本厂产品有：整体合金直柄麻花钻、粗柄麻花钻，直柄键槽铣刀、立铣刀、球头铣刀片、镶合金螺旋立铣刀、镶合金铰刀等。

I produced the whole grinding high speed steel straight shank twist drill drill head copper series, drill steel series, drilling stainless steel series, parabolic drill (deep-hole drilling) series, carbide straight shank twist drill , high-speed steel red needles (red steel series, aluminum series red, red stainless steel series), round tools, kinds of non-standard, complex tools, cutting tools.

我公司生产全磨制高速钢直柄麻花钻头，硬质合金直柄麻花钻，高速钢冲针(冲钢系列，冲铝系列，冲不锈钢系列)，圆车刀，各种非标，复杂刀具，刃具。

The technical characteristic of a pendulum drill assembly is to lose "penetration rate"in order to get"dropping angle", but sometimes a pendulum drill assembly can't meet the need of drop—off hole angle, which results in longer completion well cycle and more drilling cost.

防斜打直是常遇到的钻井技术问题，防斜的钻具组合是满眼钻具，纠斜的钻具组合是钟摆钻具，当满眼钻具满足不了井斜控制的要求，就必须强迫起钻换钟摆钻具，而钟摆钻具的技术特点是损&快&保&直&，有时还达不到纠斜要求，导致较长的建井周期和较高的钻井成本。

This paper establishes cubic spline function, analyzes subsection curve function and curve slope and curvature, at last decides to place the curve especial points which can be obtain easement curve length and other line parameters, such as the ZH point (end of line and beginning of transition curve), the HY point (end of transition curve and beginning of circular curve), the QZ point, the YH point (end of circular curve and beginning of transition curve), the HZ point (end of transition curve and beginning of line).

针对公路平面线形的8种组合类型，其线形元素特征则由最基本的直线、圆曲线、缓和曲线组成的特点，解析三次样条函数模型，得分段曲线函数、曲线斜率、曲率，从而确定曲线特征点（直缓ZH点、缓圆HY点、曲中QZ点、圆缓YH点、缓直HZ点）位置，进而得到曲线缓和曲线长度及其他线形参数。

Forelegs are straight and strong with great length between elbow and pastern; elbows well held in; forefeet large in both length and width; toes well arched; feet covered with long thick hair; fine in texture; pasterns long and straight; pads of feet unusually large and well down on the ground.

前 肢直而结实，从肘部到骹骨的长度很大，肘部贴合身体，前足爪的长度和宽度都很大，脚趾圆拱，足爪上覆盖着浓厚的长被毛，质地精细，骹骨长而直，脚垫非常大且支撑在地面上。肩关节角度恰当，使腿在身体下方合适的位置。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。