In this paper, the thickness vibration of the piezoelectric ceramic stack consisting of a number of identical piezoelectric ceramic thin rings is analyzed and its electro-mechanical equivalent circuit is obtained. The resonance frequency equation for the sandwich piezoelectric ceramic ultrasonic transducer in thickness vibration is derived.

Compared with P ( LN) ZT, the thickness vibration mode of 1-3 type piezoelectric composites is strengthened obviously, but electromechanical quality factor Q-m is reduced. All of these are in favor of increasing the emission efficiency and receiver sensitivity.

与纯P（LN）ZT压电陶瓷相比，1-3型聚合物/水泥基压电复合材料厚度方向振动增强，机械品质因数Qm明显降低，这有利于提高超声换能器的发射效率和接收灵敏度。

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Analyses of the Thickness Vibration Modes for ( yxl) φ cut Quartz Thin Plates

（yxl）φ切压电石英谐振器振动模式分析

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Thickness vibration of electrically loaded piezoelectric plate

在电负载下压电板的厚度振动

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After analyzed piezoelectric of thickness vibration, the paper provided frequency equation of thickness vibration piezoelectricity.

对厚度振动的压电片进行理论分析，推导了厚度振动压电片的频率方程。

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This paper has been introduced the imcomplete superiority that layer thickness is mined coal of the checkout of application sound wave, and has gone on research, and has selected the best scheme to design and the application of imcomplete mining coal a layer thickness checkout apparatus transducer.

文介绍了应用声波检测残采煤层厚度的优越性，对残采煤层厚度检测仪换能器的设计和应用进行了研究，选择了最佳方案。

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Instrument for Glass-thickness Measurement by Capacitance Transducer

电容传感式玻璃厚度测量仪

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According to the transmission line of Mason equivalent circuit theory, the metallic membrane plating structure of piezoelectric transducer is determinated. Then, the length, width and thickness of piezoelectric transducer and acousto-electro-optic crystal are calculated.

然后利用传输线的玛森等效电路理论计算并确定了压电换能器的最佳镀膜结构，以及换能器的长度、宽度和厚度，和声电光晶体的长度、宽度和厚度。

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The thickness of the transducer membrane is in micron scale, so we should use theory of strain gradient to evaluate the static deformation.

换能器厚度达到了微米级别，在研究薄膜应变时要应用应变梯度理论。

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The study of the impulse response of thickness vibrating transducer

厚度振动换能器脉冲响应的研究

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The smaller pushing velocity V, the thinner inner wall thickness; With the V increasing, inner wall thickness will also increase gradually, but given the bigger than 4.0mm/s V, pipe bending is prone to crinkling, its wall thickness tolerance will increasing.

推制速度较小时，弯管内侧厚度减薄，随着推制速度的增大，内侧壁厚逐渐增加：当推制速度超过4.0mm/s时，易出现起皱现象，壁厚公差明显增大。

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The paper analyzed the thickness difference in typical objects, and thickness tolerance required for different sensitivity classes.

本文分析了典型工件的厚度差，以及不同灵敏度级别的厚度宽容度。

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Orthogonal Array is applied in planning experiments to optimize the processes for plating chromium film with its thickness close to tolerance onto the inner surfaces of long tubes and for eliminating Fe-Ni alloy deposit from dullness. In the case of Fe.

运用正交表安排了试验方案，就长管内孔尺寸超差和双层镍铁/铬体系中之低镍高铁中间镀层不亮问题进行了试验，并找出主要因素，选出最佳工艺与操作条件。

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Effective method for reducing the consumption is indicated in this paper, i. e., to reduce weight of zinc layer, increase controlling level of zinc layer thickness, reduce tolerance and increase the yield of products.

减少锌耗的有效途径是降低锌层重量、提高锌层厚度控制水平、减少散差、提高成材率。

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Monte Carlo simulation can obtain the range of the controlling precision for the film thickness, tolerance on the thickness of the each layer was obtained by dynamic sensitivity analysis;

Monte Carlo模拟能够得到膜系所要求的膜层厚度控制精度范围，膜系的相对灵敏度分析可以指明每层膜对误差要求的苛刻程度；

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Instantaneous plastic deformation decreasing also as the density increases, and the "turning point" of the curve of plastic deformation vs. compressive stress which is of special importance in the thickness tolerance control of the overlaid particleboard moving along the increasing direction of stress with the density;

瞬间塑性变形随密度的提高而降低，并且，对贴面刨花板厚度控制具特殊意义的塑性变形&压缩应力关系曲线的第一个转折点随密度的提高而向应力增大方向移动；

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Via double-face equal-deep sand disposal of board, which can solve bigger thickness tolerance, worse surface quality that exist in present common bamboo plywood, and thus improve quality of bamboo plywood.

通过对板材进行双面等厚砂光处理，解决了目前普通竹胶合板产品厚度公差大、表面质量差等缺陷，使竹胶合板质量上了一个新台阶。

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The paper describes interrelation and differentiation about wall thickness tolerance and wall thickness difference of automobile motor bushing with practical example, so that it can help producing department organization producing and motor factory control reception.

本文采用实际例子叙述有关汽车发动机衬套壁厚公差与壁厚差之间的相互联系及区别，便于生产厂家的组织生产和主机厂的进货验收，以供同行参考。

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The wall thickness tolerance of hot-rolled seamless steel tubes is a major issue which has to be addressed in case of operation of any newly-built or modified hot-rolling tube mill.

如何获得更高的热轧无缝钢管的尺寸精度是新建或改造轧管机组重点考虑的问题。

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With increasingly strict demands for thickness tolerance of hot rolling strip in market, various new technologies for controlling strip profile have been developed.

随着市场对热轧板带钢精度要求的日益严格，各种控制板形的新技术也在不断地进步。

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The resultant thickness tolerance of cement lining, after measuring, is not larger than 2 mm by using the new unit.

采用这种挤涂器施工的水泥砂浆衬里，经检测，厚度偏差不超过2mm。

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