压力

In order to study the fatigue of pressure vessel commonly encountered problem in engineering with large destructibility , based on the theory of fracture mechanics , the pressure vessel existing original crack was equivalent to the problem of infinite flat with center crack .

为了分析工程中常见的破坏性极大的压力容器疲劳问题，基于断裂力学理论将存在初始裂纹的压力容器等效为无穷远处作用均匀拉应力的含中心裂纹无限大板问题，解出表面半椭圆裂纹和穿透裂纹的应力强度因子；利用断裂判据得到裂纹的临界断裂尺寸；采用Paris表达式对裂纹扩展速率进行描述，推导出初始裂纹在不同裂纹尺寸和形式下的裂纹疲劳扩展寿命。

This paper measured the constitutive relation of soil in the condition of the low stain-rate by Split Hopkinson Press Bar technology. It offers the reference for study in high stain-rate in the future. And simulated the explosion between soil and concrete by finite element dynamic analysis software LS-DYNA3D. Finished the numerical simulation for power of exploding between soil and concrete in different position of detonator and different scale model. Set out the curves of displacement, velocity, acceleration and pressure of different position. Obtained the destructibility of concrete target in different explosion condition. It offers data reference for theory studying and engineering designing.

本文首先利用分离式Hopkinson压杆实验技术测定了土在低应变率下的本构关系，为以后进行较高应变率下的研究提供了参考；后面着重利用三维显式非线性有限元动力分析软件LS-DYNA3D对土壤混凝土介质中的爆炸进行了数值模拟，采用土壤混凝土分层介质模型，完成了不同装药位置、不同缩比模型的混凝土模型中爆炸威力的数值模拟，测定了不同情况下的压力曲线及典型位置的质点位移、速度、加速度和压力，得出了混凝土靶在各种不同爆炸条件下的破坏情况，为理论研究和工程设计提供了数据参考。

A method of state equation for determining minimum miscible pressure of CO_2;2. The minimum miscible pressure s of CO2,N2,natural gas and crude oil are measured.

通过气驱细管实验，在地层条件下测定了大庆油田芳48断块在二氧化碳、氮和天然气驱下原油采收率与压力的关系，由此确定了原油与二氧化碳、氮和天然气的最小混相压力。

Pressurem measurement Behaviour of a fluid can generally be deuced from measurements of flow or pressure .a flow transducer or transmitter has to be plumbed ,in line , into a pipe , whereas pressure transmitters can be added non-intrusively as tappings to the side of a pipe .

Pressurem测量行为的流体一般都可以厉害测量的流量或压力。流量传感器或变送器已被探测，在路线，成为一个管道，而压力变送器可添加非侵入性的tappings的一侧的一个管道。

The public has gotten such a uniform message that stress is always harmful," says Janet DiPietro , a developmental psychologist at Johns Hopkins University."And that's too bad, because most people do their best under mild to moderate stress.

压力总是有害的就是公众所获得的刻板的信息"，约翰霍普金斯大学的发展心理学家 Janet Dipietro 说，"这很糟糕，因为多数人在适度到中度压力下会全力以赴。

The results show that, consolidated deviator stress ratio has the most significant effect on normalized pore water pressure developed with number of cycles. And the normalized pore water pressure developed with generalized shear strain is independent of various initial stress condition.

研究表明：非均等固结条件下，固结偏应力比对归一化后的孔隙水压力随振次增长模式影响最为显著；不同固结条件下的归一化孔隙水压力随应变增长模式却基本相同。

Finally, the compare between the dewater disc of this paper and the disc of Fournier on their structure. The reference of independently

通过改变出口压力大小以及同等压力下路径的分析，对两种圆盘的承载能力进行了对比，为更好的开发国产的滚压式污泥脱水机提供了参考。

Through numerical simulation methods, influence of starting pressure gradient on production indexes of fractured producers in diamond shaped well pattern was studied.

应用数值模拟的方法研究了启动压力梯度对菱形井网压裂井日产油量、累积产油量、含水率、采出程度、地层压力等参数的影响。

2Nd, thorough analysis: The Earth may say is an extremely marvelous thermonuclear reactor, when the earth interior pressure achieved certain critical, in the Earth material may decay the nuclear matter is called as the thermonuclear material, can have the thermonuclear reaction, thus has the huge energy, then the melted partial materials, form the rock magma are the liquid state materials, this response stratification plane is possibly many stratification planes, first possibly is located between the earth's crust and the mantle, upward next two transfers, displays for the light density material diastrophism as well as density upper mantle material phenomena and so on solidification; Under second possibly is located between the mantle and the core, the pressure is more formidable, causes not not easily to have the thermonuclear reaction thermonuclear material to have the response, forms the relative quite stable liquefied material level, simultaneously is upward next two transfers, forms the counter-flow phenomenon which the high density under mantle as well as the high density core material contact liquefies and is far away cools; These material periodicity regular movements and so on convection as well as Earth polar axis rotation are possibly the basic source powers which the terrestrial magnetic field produces.

深入剖析：地球可以说是一个非常奇妙的热核反应堆，当地球内部的压力达到一定的临界，地球物质中可衰变的核物质统称为热核物质，就会发生热核反应，从而产生巨大的能量，进而融化部分物质，形成岩浆即液态物质，这个反应层面可能是多个层面，第一层可能位于地壳与地幔之间，向上下两边对流，表现为轻密度物质的地壳运动以及中密度上地幔物质的固化等现象；第二层可能位于下地幔与地核之间，压力更为强大，引起不易发生热核反应的热核物质发生反应，形成相对比较稳定的液化物质层，同时向上下两边对流，形成中高密度的下地幔以及高密度地核物质的接触液化和远离冷却的对流现象；这些对流以及地球极轴自转等物质周期性规律性运动可能是地球磁场产生的根本源动力。

We performed experiments about quartz - coesite transition, partial melt of gabbro, and rheology of quartz diorite under differential stress condition.

实验结果表明，在差应力条件下石英－柯石英转化压力远小于静压条件下柯石英稳定存在的压力。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。