波动压力

Although the ongoing debate about the crash-landing and soft landing of U.S. economy poses more risks, its potential advantage demonstrates the capability to offset crises. And its uncertainty and unpredictability may add more pressure to the fluctuation and adjustment of international finance.

加之美国经济处于硬着陆与软着陆的争论之中，金融风险的压力更为沉重，但其潜在的优势也使其具有化解危机的能力，而不确定性、不明朗性的趋势将会加大国际金融波动与调整的压力。

For strong disturbance case in which Δp is set to be 5, by examining the distributions of relevant physical quantities along radial direction and the normal of wave front, we can infer that the slow wave introduced by the strong pressure pulse steepens into slow shock during the propagation process.

与二维情形类似，沿由源区出发的径向，可以分辨出压力脉冲增长相所引起的前导快波与后随慢波的传播，同时还可观察到压力脉冲恢复相所导致的快模磁声波的传播，由于传播速度的差异，该波动在向外传播的过程中逐渐超过后随慢波。

Lever Ball Float Steam Traps are not subject to the greatest advantage of pressure, temperature, condensate water flow fluctuations, continuous drainage, water that is exclusive, the Butterfly Valves minimum undercooling of 0 ℃, heating equipment can achieve the best efficiency; Lever Ball Float Steam Traps seat total in the level below, the formation of water seal, no steam leakage; its minimum working pressure 0.01Mpa, the biggest back-pressure rate of ≤ 85%; house with an exhaust device, lever float steam trap uses the most advanced components as the automatic emptying of diaphragm valves, can automatically rule out non-condensing gas, very sensitive, high-quality work and long service life.

杠杆浮球式蒸汽疏水阀的最大优点是不受压力、温度、冷凝水流量波动的影响，连续排水，有水即排，最小过冷度为0℃，能使加热设备达到最佳工作效率；杠杆浮球式蒸汽疏水阀的阀座总处于液位以下，形成水封，无蒸汽泄漏；它的最低工作压力0.01Mpa，最大背压率≤85%；内部带有排气装置，杠杆浮球式蒸汽疏水阀采用最先进的膜盒元件做为自动排空气阀，能自动排除不凝结气体，非常灵敏，工作质量高，使用寿命长。

"Hydraulic safety valve" is widely used in hydraulic power systems and hydraulic equipment of safety devices, pressure devices can be limited, is a special valve, which is different from the conventional valve, the traditional use of mechanical valves metal spring as a driving force, can only be limited to low pressure, encountered more BALANCING VALVES than 10Mpa pressure limit pressure can do to increase the volume of pressurized design, the traditional role of the high-pressure valves and high pressure hydraulic power systems and hydraulic equipment The limit pressure of necessity is bulky and complicated structure, difficult to manufacture large, high production costs; in the course of the fatigue of metal spring parameters change fluctuating pressure limiting Ambassador to regular revision to ensure the normal use.

&气动液压安全阀&是目前广泛应用于液压动力系统和液压设备中的安全装置，也可以作限压装置，是一种特殊的阀门，它不同于传统的阀门，传统阀门用机械金属弹簧为动力，只能限中低压力，遇到超过10Mpa以上的压力限压，闸阀只能做加大体积的增压设计，因此传统阀门作用于高压和超高压的液压动力系统和液压设备的限压时必然体积笨重，结构复杂，制造难度大，产品成本高；在使用过程中金属弹簧的疲劳变化大使限压参数波动大，要经常调整才能保证正常使用。

"Hydraulic safety valve" is now widely used in hydraulic power systems and hydraulic equipment in the safety device could also serve as limited pressure device, is a special valve, unlike conventional valves, conventional valves with mechanical metal spring as a driving force, can only be limited to low pressure, the pressure encountered over more than 10Mpa limit pressure can do to increase the volume of the Safety Overflow Valve booster design, the traditional role of the high-pressure valves and high pressure hydraulic power systems and hydraulic equipment The limit pressure of necessity is bulky and complicated structure, difficult to manufacture large, high production costs; in the course of the fatigue of metal spring parameters change fluctuating pressure limiting Ambassador to regular revision to ensure the normal use.

&气动液压安全阀&是目前广泛应用于液压动力系统和液压设备中的安全装置，也可以作限压装置，是一种特殊的阀门，它不同于传统的阀门，传统阀门用机械金属弹簧为动力，只能限中低压力，遇到超过10Mpa以上的压力限压，只能做加大体积的增压设计，因此传统阀门作用于高压和超高压的液压动力系统和液压设备的限压时必然体积笨重，结构复杂，制造难度大，产品成本高；在使用过程中金属弹簧的疲劳变化大使限压参数波动大，要经常调整才能保证正常使用。

On the basis of destroying mechanism of good cushion, a new kind of high-speed pneumatic cylinder with self-adjusting cushion for supply pressure fluctuation is designed, which use relief cushion valve and feed supply pressure back cushion valve.

当供气压力在一定范围波动时，溢流阀开启压力也同时按照一定规律自动改变，使缓冲腔吸收能量与冲击能量保持平衡，实现了无需人工调整，缓冲性能自动保持良好。

According to the characteristics of gas-collector pressure and suction-control of blower system for coke oven in Xiangtan iron and steel company, primary system is developed. Fuzzy control technology and routine PID technology are combined, and the control method of the pressure of gas collector in coke oven is given based on the fuzzy theory ,then decoupling control is adopted for coupling phenomenon.

针对湘钢焦炉集气管压力和鼓冷系统吸力控制特点，对原有系统进行改造，将模糊控制技术和常规PID控制技术相结合，提出了一种基于模糊理论的焦炉集气管压力控制方法，结合相邻通道的波动引起的耦合现象，采用模糊解耦原则进行解耦控制。

According to the characteristics of gas-collector pressure and suction-control of blower system for coke oven in Xiangtan iron and steel company, primary system is developed. Fuzzy control technology and routine PID technology are combined, and the control method of the pressure of gas collector in coke oven is given based on the fuzzy theory ,then decoupling control is adopted for coupling phenomenon.

中文摘要：针对湘钢焦炉集气管压力和鼓冷系统吸力控制特点，对原有系统进行改造，将模糊控制技术和常规PID控制技术相结合，提出了一种基于模糊理论的焦炉集气管压力控制方法，结合相邻通道的波动引起的耦合现象，采用模糊解耦原则进行解耦控制。

The experimental studies were performed in the laboratory of Thermo King. Based on refrigerant flow distribution between the two evaporators, a new control method of on/off ratio of air-condition was put forward and compared with evaporator pressure regulator valves control method.

在深圳大冷王冷藏车实验室进行了制冷系统的实验研究，针对两侧蒸发器流量分配以及压缩机吸气压力波动的问题，提出了一种控制空调开停时间比的新控制方法，并与传统的蒸发压力调节阀控制方法进行了比较。

The stresses in the shell of tank and in the structures of opening s at the top and bottom crown of tank under the several conditions including pressure-testing, operating, seismic and pressure circle fatigue were analyzed by means of the finite element analysis.

介绍了1000m3 氧气球罐的应力分析设计，分别对球罐整体及其上下极开孔结构压力试验工况、操作工况、地震工况和压力波动疲劳工况的应力进行了有限元分析，对其应力进行强度和疲劳寿命评定校核。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。