压下

Under the given condition of acoustic driver, the acoustic field including oscillating pressure, volume flow rate and acoustic impedance in resonator was theoretically reconstructed by using the two-microphone method. The experiment results validate that this method is applicable and accurate for the positions with non pressure antinode and node in resonator. The maximum errors near antinode and node area are up to 12.4%.

在给定双声源条件下，采用双传感器法对该系统谐振管中的声场参数（包括声压、质点速度、当地声阻抗等）分布进行理论声场重构，并通过实验分析，证实了该方法在等径谐振管内非声压腹点和节点处的适用性和准确性，而在声压腹点和节点处的误差最大达到12.4%。

The method of testing the compression-sensitivity of CFRM is confirmed.Secondly, on the foundation of CFRM, the compression-sensitivity of CFRC is studied by mixing thick carpolite.

其次，在研究CFRM的基础上，加入粗骨料，研究CFRC的压敏特性，并进一步研究CFRC在准三向受压情况下的压敏性。

Methods Retrospectively analysis 32 cases (32 eyes) of primary retinal detachment which had accepted surgery under indirect ophthamoscope with no hand-held condensing lens.

回顾性分析32例32眼原发性视网膜脱离术中局部巩膜抵压法压陷后，不用手持聚光透镜而在间接检眼镜直视下进行巩膜外冷凝、垫压或环扎手术，临床观察统计手术效果。

In this paper the effect of countersink depth on the seam overlap percent has been analyzed by using the method of the 209 can's simulator seam and ideal parameters with computer,and this paper deals with the tendency of this effect,reference data of this effect of countersink depth on the seam overlap percent and seam guide methods in practice production is suggeste

本文通过对设定理想参数下的209罐型在计算机上的模拟卷封，分析了压头埋头度对卷封叠接率的影响，阐述了压头埋头度对卷封叠接率的影响趋势，并提出改变压头埋头度对改变卷封叠接率的参考数据，以及在实际生产中的指导方

Check paper may affect the pressure of the pressure that the reason for the press paper under the valve in the fuel tanks in the culumn because of the unavailability for a long time fatigue has broken off a section of this article, press paper cylinder performance of the product will be trimmed to be exerted by request, the replacement of a good spring, cut-quatily.

逐一检查可能影响压纸器压力的诸多方面后，发现原因在于压纸油缸内下阀芯里的压力弹簧因用久疲劳折断了一节，致使压纸油缸的工作性能满足不了产品裁切时应施加的压力要求，更换完好的弹簧后，裁切的质量达到了要求。

By simplifying the mechanical model,constitutive relation defined in principal direction based on elasticity theory with different moduli was rebuilt in common ordinates,and tension-compression area was divided.

通过合理简化模型，将不同模量弹性理论中定义在主坐标系下的本构关系重新建立在普通坐标系下，进行拉压分区，从而推导了考虑自重且顶部有水平推力的不同模量弯压柱近似弹性力学解答，并由横截面上正应力为零判定了中性层的形状和位置。

Since the turbine-driven feedwater pump failed to regulate directly the drum level of single boiler and problems like pressure overrun of main feedwater pipe existed, DCS was utilized to solve the problems for its features of shared information, powerful configuration functions and easy modification.

在对国电成都热电厂嘉陵2×142MW机组两炉一机单元给水系统控制方式进行分析的基础上，针对运行中出现的汽动给水泵不能直接调节单台锅炉汽包水位及给水母管压力超限等问题，利用分散控制系统信息共享、组态功能强大、修改方便的特点，在不增加硬件设备的情况下，通过软件组态增加了汽动给水泵调节单台锅炉汽包水位调节回路和给水母管超压及欠压保护回路，实现了机组在一炉一机单元运行和两炉一机母管运行2种运行方式下给水自动的合理控制，并解决了给水母管的压力保护问题，提高了机组运行的安全可靠性。

Results: Sixteen weeks later, compared with the Sham group , tail blood pressure, LVW/BW, LV ending systolic pressure, and LV ending diastolic pressure increased respectively (P.01); the maximal values of positive rate of LV pressure +dp/dt(subscript max, P.05 and the maximal values of negative rate of LV pressure -dp/dt(subscript max, P.01 decreased in the Operated group.

结果：实验结束时手术组鼠尾血压、左心室重量/体重、左心室收缩末压和左心室舒张末压均分别较假手术组增高(P.01)，左心室压力上升最大速率+dp/dt(下标 max， P.05和左心室压力下降最大速率-dp/dt(下标 max， P.01较假手术组下降。

The existence ofpolar nanoregions dramatically influences the extrinsic dielectric nonlinearityof paraelectric phase. 5 Slow relaxations of field induced piezoelectricresonance of paraelectric barium stannate titanate were observed after eitherapplying or removing a DC bias field. This phenomenon is attributed to slowspace charge dipoles formed by injected homocharges and validated by theobservation of a negative piezoelectric constant. Isothermal study ondielectric constant and discharging current after application or removal of astep field were performed. The relaxation laws in ferroelectric andparaelectric phases are different. The transportation of homocharges arebelieved to be responsible for the strong relaxation behavior in paraelectricphase. Domain wall can trap space charges thus the relaxation in ferroelectricphase is relatively weak. Abnormal phenomena, such as slim-waisted hysteresisloops, abnormal C-V curves and clockwise reversible hysteresis loops observedin barium stannate titanate ceramics, were attributed to pinning of gatheredpoint defect on domain walls.

5研究了直流电场施加和撤除引起的钛锡酸钡顺电相场诱压电谐振慢弛豫现象，认为这是同极性空间电荷注入形成空间电荷慢偶极子导致的，观察到的负压电常数证实了这个观点；研究了等温条件下阶跃电压作用下介电常数和放电电流的慢弛豫现象，发现钛锡酸钡陶瓷的铁电相和顺电相呈现不同的宏观性能时间依赖规律，认为是同极性空间电荷的输运过程导致了顺电相样品呈现强的弛豫行为，铁电相中存在畴壁捕获空间电荷的机制因而其弛豫行为较弱；研究了钛锡酸钡陶瓷中束腰电滞回线、反常 C-V 曲线和顺时针可逆电滞回线等反常现象，将其归因于点缺陷的聚集对铁电畴畴壁的钉扎作用，多次电场循环有助于解除这种钉扎状态，减弱反常特征。

In summary, various key experimental conditions in electron acoustic imaging of ferroelectric domains were systematically studied. The optimum experimental conditions to obtain EAI of domains with good quality and the factors important to image analysis have been presented. The piezoelectric vibrator model and calculation of motion equation are helpful for explaining the imaging mechanism and related experimental phenomena. The sample holder with variable electric field was designed. The domain movement of BaTiO〓 ceramics and crystal under lateral and longitudinal applied electric field and domain movement of PMN-PT crystal under longitudinal poling electric field were observed. The application of SEAM on revealing of ferroelastic domains, imaging of residual stress distribution in ceramics coatings and around the pores on the surface of ferroelectric ceramic composite have been reported respectively. All these works enriched the study of electron acoustic imaging and extended the application of SEAM in the characterization of materials.

综上所述，本文系统地研究了各项关键实验条件对电畴电声成像的影响，指出了获得最佳畴结构电声像的条件和成像分析中应当考虑的各种影响因素；提出了解释电畴电声成像的压电振子模型，在此基础上推导并求解了压电振子运动方程，并对一些实验现象作出了解释；成功地设计了可变电场的样品台，观察了BaTiO〓陶瓷和晶体在横向电场作用下的畴运动，PMN-PT晶体在纵向极化电场作用下的畴运动；探索了电声显微镜在铁弹畴成像，陶瓷涂层应力观察，陶瓷自然表面气孔周围应力成像的应用，这些研究，丰富了电声成像的学术内涵，拓展了电声显微镜的应用领域。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。