压下的

It is found that the former provide more uneven circular stress state than the latter after comparing the circular stresses both of intrados and extrados,which extrados stress is large and intrados stress is small.That is confirmed by the results of experiment that the practical burst pressure...

结论认为，内压作用下的弯管结构属于有力矩旋转壳，整体环壳第二弯曲半径由外拱区的正半径变化为内拱区的负半径，引起应力性质的变化，只考虑薄膜应力的弯管内压爆破理论存在不安全的因素。

Though several leak detecting methods are available, they are not ideal inapplication scope, including responses speed and accuracy of leak localization. In thisdissertation, according to the conditions of pipeline transportation in our country,research is carried out on crude oil transported pipelines leak detection and locationtheory and the study on its supervisory system is given.

本文结合我国管道输送的实际情况，针对原油管道泄漏检测技术及其运行监测系统进行了深入的研究，主要进行了以下几个方面的工作：将小波变换技术引入到负压波特征拐点的捕捉，利用连续小波变换时间-尺度特性检测信号的奇异点，能够有效的检测出强噪声背景下的信号边沿，此外，还提出了负压波法泄漏检测中误报警消除的多种方法。

Studied the inner resistance in different charge capacity and different charge magnification, researched the charge efficiency in different charge capacity, and measured the inner resistance at high rate.

通过对失效电池不同充电容量、充电倍率下交流内阻的研究和大电流脉冲下直流内阻的研究，确定了快速判定MH-Ni电池是否失效的相关方法，并通过测量电池的内压和不同充电容量下的充电效率讨论了其有效性

Pressure governor valve is the use of a spring-loaded power and pressure balance theory, when the spring-loaded pressure less than atmospheric pressure and the valves closed when the pressure is greater than the spring-loaded rubber tubing stretch when the bottom of compressed air diaphragm, diaphragmthe effort to promote diaphragm upward and left vavle seat blow the air flow of gas, this would piston shirking role in the pressure mobile, Selection will be emissions from valve seat, air compressors made by the then air into the gas valves and exhaust emissions is through the mouth into atmospheric

调压阀的原理是利用了弹簧力与压力相平衡的原理，当弹簧的压力小于气压的时候阀关闭，当压力大于弹簧的弹力时候橡胶调压膜片下方的压缩空气对膜片的作用力，推动膜片向上拱曲离开阀座而使空气流入气腔，此时卸荷活塞在气压作用下移动，将排放阀门推离阀座，于是由空气压缩机充入气腔的空气便通过排放阀和排气口排入大气空气压缩机空转。

Pressure governor valve is the use of a spring-loaded power and pressure balance theory, when the spring-loaded pressure less than atmospheric pressure and the valves closed when the pressure is greater than the spring-loaded rubber tubing stretch when the bottom of compressed air diaphragm, diaphragm the effort to promote diaphragm upward and left vavle seat blow the air flow of gas, this would piston shirking role in the pressure mobile, Selection will be emissions from valve seat, air compressors made by the then air into the gas valves and exhaust emissions is through the mouth into atmospheric air compressors idling.

调压阀的原理是利用了弹簧力与压力相平衡的原理，当弹簧的压力小于气压的时候阀关闭，当压力大于弹簧的弹力时候橡胶调压膜片下方的压缩空气对膜片的作用力，推动膜片向上拱曲离开阀座而使空气流入气腔，此时卸荷活塞在气压作用下移动，将排放阀门推离阀座，于是由空气压缩机充入气腔的空气便通过排放阀和排气口排入大气空气压缩机空转。

Two mathematical models have been deduced in the case of dense-phase and light-phase conveying respectively. Combining the capacitance phase concentration sensor designed and the traditional Venturi flow meter, the powder velocity and instantaneous mass flowrate are obtained by measuring concentration and differential pressure signal.

本文最后提出了一种差压—浓度法测量气/固两相流瞬时质量流量的新方法，分别建立了稀相和浓相输送情况下的粉料速度和流量测量的数学模型，即将所研制的电容式相浓度传感器与传统的文丘里流量计相结合，通过测量浓度信号及差压信号，求得粉料的传送速度及其瞬时质量流量。

The previous literatures indicate the inversion temperature exists under superheated steam drying with an atmospheric pressure, when the temperature of superheated steam is higher than the point of inversion temperature, the drying rate of superheated steam is faster than that of air drying, but if the temperature of superheated steam is lower than the point of inversion temperature, the drying rate of superheated steam is slower than that of air drying.

已有的研究表明，在过热蒸汽干燥时存在一个温度点，称为&逆转温度&，当过热蒸汽的温度高于&逆转温度&的温度时，过热蒸汽干燥速率比空气要快，低于逆转温度时则正好相反。由于木材浮压干燥的工业化应用是在负压区实现的，因此对真空状态下过热蒸汽干燥是否也存在&逆转温度&问题的研究非常重要。

Simulation results show that both the longitudinal and transverse wave are included in the reflected waves,the reflection coefficient of longitudinal wave augments with the increase of the incident angle,and the reflection coefficient of transverse wave augments first and then minishes,the transverse wave disappears when the incident angl.

主要研究了声波从粘弹性介质向流体介质斜入射情况下的声反射特性，分析表明：反射声波中有横波和纵波同时存在，纵波声压反射系数随入射角度的增大逐渐增大，横波的声压反射系数随入射角度的增加先增大后减小，在垂直入射时只有纵波，而没有横波存在。

On the foundation of Betti s theorem,the constitutive relation of multi-crack rockmass which considers the effect of crack-closure is developed in this paper.

本文从贝蒂定理出发，考虑裂隙在压剪应力作用下的闭合效应，推导出有序多裂隙岩体的本构方程，同时采用数学弹性力学的方法，精确推导出传压系数的理论公式，并对传剪系数加以分析。

With Linear Time-Invariant modeling of phase noise and definition of"effective resistor", we analyze the critical parameters of the circuit and calculate the value of phase noise at the 1 /f~2 region. 3. A 4.2GHz VCO tuned by an accumulation-mode MOS varactor in TSMC 0.35μm SiGe BiCMOS process is obtained after debugging with the simulator SpectreRF.

以低压、低功耗、低相位噪声和较大调谐范围的设计目标对压控振荡器进行设计优化，最后得到由积累型MOS变容管调谐的压控振荡器，电源电压为1.5V，功耗约10mW，中心频率为4.2GHz，调谐范围为28%，在频率偏移量为600kHz处的相位噪声为-128dBc/Hz，与线性时不变模型下的理论推导结果非常接近。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。