压

The numerical results of stationary and transient Green'sfunction for high-velocity surface-head wave on some selected crystals are comparedThrough the above analyse,it is indicate that the first arrival wave mode is thelongitudinal-wave head-wave,and its propagate velocity is equal to the groupvelocity of the longitudinal bulk wave alone the surface.Furthermore,this modedoes not have the Δv/v effect,i.e.,its velocity is the same no matter the surface isfree or metalized.

通过对表面激发的瞬态和稳态Green理论分析和数值计算，表明在压电晶体表面上实际上看到的最高速的最先到达的波动模式是纵波头波，它具有沿表面纵波的群速度，而且对压电晶体，它不具有Δv/v效应，即在自由表面和金属化表面其传播速度是一样的，而压电晶体表面波及伪表面波均存在Δv/v效应。

Formation damage can be minored by using CO2 foam fracturing fluid as it has low filtration, high flowback and good compatibility with formation fluids.

由于CO2泡沫压裂液具有滤失量低、返排能力强、与地层流体配伍性良好等优点，采用CO2泡沫压裂技术，可减小压裂液对地层的伤害。

In the light of hysteresis, creep and nonlinearity of piezoelectric actuators, two control methods are presented. One is PID feedback control with BP neural network modeling in feedforward loop. Another is Fuzzy-PI sectionalized multimodal control. They are used for highspeed and precise position control of models driven by piezoelectric actuators.

针对压电陶瓷存在迟滞、蠕变和位移非线性等不足，提出了两种压电陶瓷微位移驱动器的位置闭环控制方法：带有BP神经网络前馈模型的PID控制方法和Fuzzy—PI多模态分段控制方法，实现了压电陶瓷微位移驱动器快速、高精度的位置控制。

The choose that the method chooses course of Ⅱ of ~ of Ⅰ of ASA of 30 60 years old of above period operation patient, random cent is contrast group and observation group each 15, capacity balance is maintained in art, art Bi Da arrives unplug after providing a standard, contrast 10 ML of physiological saline of group vein inject, observation group vein injects 0.5 Mg/kg of Ai Siluo Er, note with drop of 0.002% monobel vein, when subsequently observation unplugs tubal period differs paragraph of systole pressing , diastolic pressure , heartbeat and heartbeat and systole control product .

方法选择30例60岁以上ASAⅠ~Ⅱ级的择期手术患者，随机分为对照组和观察组各15例，术中维持容量平衡，术毕达到拔管标准后，对照组静脉注射生理盐水10 mL，观察组静脉注射艾司洛尔0.5 mg/kg，并以0.002%硝酸甘油静脉滴注，随后观察拔管期不同时间段收缩压、舒张压、心率及心率和收缩压乘积的变化。

Moreover CGANN was utilized to recognize the patterns of piezoelectric TSM array data set. The results show that the algorithm has strong compatible capacity and can correctly identify the samples of different classes of chemical substances such as ethanol, chloroform and acetone.

同时我们使用CGANN方法作为模式识别工具，对压电TSM晶体传感器阵列数据进行了分析，结果发现压电TSM晶体传感器阵列能够准确的识别气态物质，比较其他方法而言，CGANN具有明显的优点，如容错能力更强，识别速度更快等，CGANN方法同压电TSM晶体传感器阵列的结合在气态物质识别中有着广阔的应用前景。

And eliminates pulsing, pumping action of regulator when operating at high usually

卡司凯特轴式Horus 差压型导压计，确保主压阀在巨大起伏与高压状下的性

By the analogy test, the arc suppressing effect of mechanical arcless on-load tap changer is clear, The scheme of arcless on-load voltage regulating system, which is consisted of thyristor controlled series transformer and thyristor controlled filter, is illuminated on electrical structure, control strategy and performance in details.

无弧有载调压技术的研究方向分为机械式无弧有载分接开关调压和静止无弧有载调压两个方面，通过模拟试验，对机械式无弧有载分接开关的灭弧效果和应用可行性进行了探讨。

The actions of quick feed, workpiece feed and quickreturn of the press can be realized automatically under the program control, it is suitable for the arber of axle sleeve parts and the bending, shelling and pressing of sections parts and the stretching of parts, it can be used for flow assembly of car, machine, automobile electric,appliance motorcycle absorber and air conditioner electric appliance compared with common hydraulic press, Type YKT high speed hydraulic press is of high accuracy of adjustment, quick action, stable repeat accuracy and safe reliable operation.

YKT型快速液压机是一种多功能的液压机床，在程序控制下自动实现压机的快进、工进、快速返回等动作，适用于轴套类零件的压装，型材零件的弯曲、压印、套形及零件的拉伸等工艺动作，可应用于汽车、机床、内燃机、轻纺机械、洗衣机、汽车电器；摩托减震器、空调电器等行业装配的流水线上，与普通液压机相比，YKT型快速液压机具有调节精度高、动作速度快，重复精度稳定、操作安全可靠等优点。

The actions of quick feed, workpiece feed and quickreturn of the press can be realized automatically under the program control, it is suitable for the arber of axle sleeve parts and the bending, shelling and pressing of sections parts and the stretching of parts, it can be used for flow assembly of car, machine, automobile electric,appliance motorcycle absorber and air conditioner electric appliance compared with common hydraulic press, Type YKT high speed hydraulic press is of high accuracy of adjustment, quick action, stable repeat accuracy and safe reliable operation.

产品介绍： YKT型快速液压机是一种多功能的液压机床，在程序控制下自动实现压机的快进、工进、快速返回等动作，适用于轴套类零件的压装，型材零件的弯曲、压印、套形及零件的拉伸等工艺动作，可应用于汽车、机床、内燃机、轻纺机械、洗衣机、汽车电器；摩托减震器、空调电器等行业装配的流水线上，与普通液压机相比，YKT型快速液压机具有调节精度高、动作速度快，重复精度稳定、操作安全可靠等优点。

The biological pollution of the non-indigenous organisms via ballast water was discussed in details, then some kinds of ballast water treatment measurements which have been in use or being investigated now were introduced, the research developments of the heat treatment of ballast water by marine engine's cooling water was presented particularly.

文章对由压载水引起的外来生物污染问题进行了较详细的阐述；之后介绍了目前已经应用或正处于研究中的各种压载水处理方法，并详细介绍了船舶冷却水加热处理压载水的研究动态。

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。