压力

The studies was proceeded on the the supercritical CO2 extraction technique of rotenone from Tephrosia vogelii. The extraction influences of technology conditions were systematically groped, The research results were listed as follows:1 The analysis method applied in this paper has been proved to be suitable to technology research of the studies on the SC-CO: extraction technique of rotenone from Tephrosia vogelii. 3 indexes, extraction ratio of rotenone. extraction ratio of total compounds and rotenone content percent in total compounds weight, were carried out with HPLC quantitatively determination combined with the sample weight loss after extraction. With these 3 indexes. The extraction influences of technology conditions were evaluated by synthesis. Then the best technology conditions were ascertained for different extraction aims.2 The pretreatment of rough material should be needed before extraction. Comminuting the material to 0.28mm size is most fit to SC-CO: extraction.3 Firstly static extracting 20 min then turn to dynamic doing is the better extraction mode than other ones.4 The orthogonal experiment was conduct with 3 factors and 5 levers.

本论文通过对非洲山毛豆SC-CO_2萃取中影响萃取效果的工艺条件的研究，初步得出如下结果：(1)本论文中所采用的萃取效果评价方法适宜于非洲山毛豆中鱼藤酮的超临界流体萃取技术研究，该方法具体为：HPLC定量分析非洲山毛豆SC-CO_2萃取物中的鱼藤酮含量，再结合萃取前后处理样品的重量损失，得出鱼藤酮萃取率、萃取所得粗物质萃取率和粗物质中鱼藤酮含量三个参数，以此三个指标综合评价萃取条件对萃取效果的影响；(2)通过对原料粒度对萃取效果影响的研究，结果表明SC-CO_2萃取非洲山毛豆复叶中的鱼藤酮，原料粉碎成30目粒度叶粉时萃取效果较好；(3)通过对萃取方式与萃取效果之间关系的研究，结果表明SC-CO_2萃取非洲山毛豆中鱼藤酮应采用先静态后动态的萃取方式，静态萃取时间为20min；(4)通过温度、压力和CO_2流量三因素五水平的正交试验，结果表明温度是最主要的影响因素，压力因素对鱼藤酮萃取率的影响程度高于CO_2流量，而对于粗物质萃取率和粗物质中鱼藤酮含量CO_2流量因素高于压力。

The results show that when the pressure increases, the gasification reaction rate will be faster, the concentration of CO and H2 reduce, the concentration of CH4 increase and undecomposed vapor increase. When the pressure increases from 1 to 200atm, the concentration of CH4 will increase from 0.06% to 5.66%. Pressure has little effect on the heat value of syngas.

研究表明：随着气化压力的提高，气化反应速度加快，合成燃气中CO和H_2含量减少，CH_4含量增加(反应压力从1atm提高到200atm时，CH_4含量从0.06%提高到5.66%)，未分解的水蒸汽量增加；压力对高温气化燃气热值影响不大。

The core of this difficulty is how to keep the circulating pressure at the well bottom lower than the pore pressure or reservoir pressure within a proper margin (i.e., to design the underbalance degree).

其核心问题是如何在钻井过程中保持井底循环压力低于地层孔隙压力或储层压力在一个合适的范围内。

The generating reason,response characteristic and distributing rule of remaining oil was deeply studied aiming at water-flooded continental reservoir with characteristic of intense heterogeneity,high water-cut,low recovery efficiency,complex distributing rule of mobile remaining oil,intergrowth of major and untabulated formation . At the same time,a systemic method of evaluation and predicating remaining oil and pressure was put forward basing on the theory of development geology,seepage flow mechanics,fluid mechanics which resolved the hard technologic problem of predicting remaining oil and pressure.

本文针对陆相注水开发油藏具有非均质性强、含水率高、原油采收率低、可采剩余油分布复杂、主力产层和表外产层同时存在等特点，深入研究了剩余油的形成机理、响应特征和分布规律，应用开发地质学、渗流力学、流体力学和地质统计学理论，将静态地质数据和动态开发数据相结合，综合现有的与剩余油及压力分布有关的所有资料，提出了一套系统的评价和预测剩余油及压力的方法，较好地解决了目前剩余油与压力评价和预测中的技术难题。

It show that interstitial fluid pressure changes its sig n twice within one arteriolar vasomotion period and it is therefor not important that interstitial fluid pressure is a little higher or lower than atmospheric p ressure; arteriolar vasomotion can periodically result in lymph formation and in terstitial total pressure plays an important role in this procedure; local regu l ation of microcirculation can meet metabolic need to some extent in the form of dynamic equilibrium.

利用解析法与有限元法相结合的&影响线算法&，求解了第一部分中建立的数学模型，分析了微循环系统动力学的若干重要问题，表明在微动脉自律运动周期内，间质流体压力将两次改变符号，因而某些理论中十分强调的间质流体压力是略高于或略低于大气压力的问题显得并不重要；微动脉自律运动能导致周期性的淋巴形成，间质总应力在这一过程中起着重要作用；微循环局部调节可以以动态平衡的方式在一定范围内满足代谢的需要。

Dwyer has been for 75 years in the World, its Low 〔differential） pressure instruments are high appreciated and are applied broadly over the World. Alicat Scientific has over a decade of experience in providing Mass Flow Meter, Flow Controller , Pressure Gage and Pressure Controller products. InstruTech concentrates in researching and manufacturing the vacuum gauges. Wasco concentrates in producing pressure switch、vacuum switch and pressure transmitters. Pyropress has been for about 60 years in the control and procedure application in the world, its products are rugged, lasting, many of which have options of explosion-proof, they are widely used in the harsh fields such as nuclear and non nuclear power generation, petroleum, chemical industry, defense industries, and so on.

美国Dwyer公司已有75年的历史，其微〔差）压产品在全球享有极高盛誉并得到了广泛的应用；美国Alicat公司在流量测量和控制领域有着数十年的丰富经验，为您提供精确、可靠的质量流量解决方案；美国InstruTech公司专注于真空测量仪表的研发和制造；美国Wasco公司是专业的压力开关、真空开关、压力变送器制造商；美国Anderson公司专业制造用于医药、食品等领域的卫生型压力、流量等仪表；英国Pyropress公司在控制和过程应用方面有近60年的历史，其产品坚固、耐用，许多都有防爆选项，大量用于核电站、电厂、石油、化工和国防等要求严格的领域。

The results show that the flow length of microfluid in micro channels that have different section shapes but the same length(50 mm) is in inverse proportion to sections RPA (RPA means the ratio of the section s perimeter to its area),and the smaller the RPA , the longer the flow length.

研究结果表明：微流体在截面形态不同，长度均为50 mm微流道中的流动长度与流道截面的比表面积(截面周长与截面面积的比值)呈反比关系，比表面积越小，流动长度越大；当微流道的比表面积较小时，熔体温度与注射压力对流动长度的影响较大；当比表面积较大时，熔体温度与注射压力对流动长度的影响较小，且不论比表面积如何变化，注射压力对流动长度的影响比熔体温度对流动长度的影响显著。

On the safe side, we should use active soil pressure and passive soil pressure to calculate the support strength before T increased. That is RA=EA-EP Among them: RA ………… holding strength EA ………… composite force of active soil pressure EP ………… composite force of passive soil pressure Immediately, flexural torque distribution of enclosure wall can be counted. Mmax is the location of shear force zero. Equivalence beam method abridges. No matter which kind of supporting structure form, the key problem lies in the establishment depth of catch point, severity of support and enclosure wall, penetration depth and pit bottom quality of soil property.

单道锚杆支护结构计算分别采用静力平衡法及等值梁法，根据试算法插入深度t值需先进行假定墙的插入深度确定后来计算支撑力，为了安全起见，可按插入深度增大前的主动与被动土压力合力计算支撑力即 RA=EA-EP 式中：RA …………支撑力 EA …………主动土压力合力 EP …………被动土压力合力随之可求围护墙的弯矩分布，Mmax为剪力为零点的位置，等值梁法的计算略述。

It is found that for the same volumetric flow rate, the pressure drop in the shell side of the curved baffle heat exchanger is remarkably lower than that of the traditional one. And the pressure drop percentage deceases even more for a smaller curvature radius of the curved baffle and height of the baffle cut.

结果发现：在流量一定的情况下，曲面弓形折流板换热器的壳程压力降明显低于普通弓形折流板换热器的壳程压力降，而且随着曲面折流板曲率半径和折流板圆缺口高度的减小，曲面弓形折流板换热器的壳程压力降降低的百分比增大。

A pressure compensator equalizes lubricant pressure to the exterior of the bit.

压力补偿器使润滑油压力与钻头外部的压力平衡。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。