使延长

When the tangential residual stress exists, the stretching stress can enhance and the crushing stress can remarkably reduce the compressive strength.

因此，为了提高石油套管的抗压溃强度，应根据管体的受力状态，使石油套管的管体上产生最佳的残余应力值，提高石油套管的抗压溃强度，延长使用寿命。

The results indicated that with the increasing of storage time, the leaves etiolated, contents of crude-fiber increased, while vitamin C, chlorogenic acid decreased, nitrate contents up to the maximum at the 3th day after storage , then decreased gradually. Stored at 2℃, the contents of chlorophyll, vitamin C, chlorogenic acid were higher, nitrate and crude-fiber contents were lower. The lower of membrane permeability and MDA content, the higher activity of SOD significantly delayed senescence process and prolonged storage life of Taraxacum mongolicum.

结果表明：采后蒲公英随着贮藏天数的增加，叶片逐渐黄化，粗纤维的含量升高，维生素C和绿原酸含量下降，硝酸盐含量先升高后降低；2℃下贮藏能够使采后蒲公英具有较高的叶绿素、维生素C、绿原酸，较低的硝酸盐和粗纤维含量，较低的细胞膜渗透率、MDA含量和较高的SOD活性，显著地延缓其衰老进程，延长贮藏寿命。

Pass the method that designed a layer of heavy chemical element plasma in the outer circle of the D-T plasma , making the time extension of the thermonuclear fusion reaction .

通过在氘氚等离子体的外围设计一层由重元素离子组成的等离子层的办法，使热核聚变反应的时间得以延长。

And what we do Computer lab fire prevention burglary-resisting system to answer require but make this, computer lab fire prevention burglary-resisting system adopt the infrared sensor, Temperature sensor, gas detector have lens , spend system able to programmer simulation circuit and picture transmit and implement and control 2 4 hours to computer lab correctly with subminiature device, Find unusual situation auto alarm , play a firing prevention and guard against theft role really , can make computer system relatively safe in one, In the reliable environment, operate steadily for a long time, and lengthen service life to the best of one's ability.

而我们讨论的机房安全措施正是应此要求而做的，机房安全措施统通过红外传感器，温度传感器，气体探测器还有摄像头，利用系统可编程模拟电路ispPC20以及用CCD超小型器件对图像传输对机房实施二四小时监控，发现异常情况自动报警，真正起到安全防范的作用，能够使计算机系统在一个相对安全，可靠的环境里，长时间稳定地运转，并尽可能延长使用寿命。

Part Ⅱ Effects of sex hormones on action potential and I〓、I〓 current in rat ventricular myocytes Objective To investigate effects of estrogen and androgen replacement on action potential and I〓, I〓 current in rat ventricular myocytes, from which to elucidate the ion mechanism of gender difference in torsade de pointes.

雌雄大鼠发生TdP的性别差异性与性别本身无关，关键在于性激素的差异，雌激素可通过使心肌细胞在复极延长的基础上EAD发生增加，导致触发活动，从而发生TdP；雄激素的作用则相反。

In mobile Ad Hoc networks, geographical routing protocol was a kind of important routing protocols, which requires the underlying topology be planar, sparse, connected and t-spanner in order to guarantee the delivery of message and bound the routing length. A new topology control algorithm named ODT, which constructed the geometry structure named ODT graph, was proposed.

基于移动Ad Hoc网络的特性，提出了一种适用于移动Ad Hoc网络的路由协议PAGPSR(Power-Aware Greedy Perimeter Stateless Routing)，该协议在原有的基于地理位置的路由协议GPSR的基础上增加了节点能量感知和负载均衡算法，修改了GPSR的转发策略，使网络中能量消耗和网络负荷分布更加均匀，从而延长了整个网络的生存时间。

In the invention, heat exchanging pipe is washed once by water in every interval. The scale removal flow is provided with big shear stress and strong embedding ability. It can wash gruel sale of the pipe wall down and clean on line so that purposes of maintaining high-efficiency heat conduction of air cooler, prolonging the running period of air cooler and decreasing operation cost, are achieved.

本发明每间隔一段时间，通入水对换热管束冲刷一次，除垢水流的剪切应力大，裹挟能力强，能使管壁上剥落的粥样水垢冲刷掉，起到在线清洗的作用，从而达到维持空冷器高效传热、延长空冷器运行周期、降低运行成本的目的。

The use of plastic introduction systems will cause unusually long washout times.

使用塑料进样系统将使清洗时间明显延长。

To match these needs,a bigger wing aspect ratio and winglet are adopted as the improvement measures,hopefully the lift-drag ratio of the modified UAV could be increased.

为延长某无人机的留空时间，加大航程和提高升限，用适当加大机翼展弦比和加装翼尖小翼的办法对原型机的气动特性进行了改进，以期能使该无人机的升阻比有较大提高。

Results showed that all the three sweet sorghum varieties contained plentiful sugar, which can provide enough carbon source for alcohol fermentation, however, total nitrogen and some mineral elements（Fe3＋）cannot meet the needs of alcohol fermentation. Activity of most microbes in stalk juice can be inhibited and the sugar can be maintained when the stalk juice was condensed to 4～5 times. Due to the reasons that the activity of acetous microbe or hydrolysis enzyme inside stalk juice can be maintained, ratio of reducing sugar to total sugar was increased with storage time at 55～60℃,0.15 MPa vacuum condensed condition, which can be beneficial for the purpose of alcohol fermentation.

结果表明，三个品种都含有丰富的糖分，可以为酵母菌发酵制取酒精提供良好的碳源，但总氮和某些矿物质元素（如：Fe3＋）不能满足酒精酵母的营养需要；甜高粱茎秆汁浓缩至4～5倍时，可以抑制汁液中大多数微生物的活动，使其中糖分不受损失；在试验设定的真空浓缩工艺条件下（55～60℃，0.15 MPa）甜高粱茎秆汁中产酸微生物或水解酶类仍保持活性，使得还原糖占总糖的比率随贮藏时间延长而升高，这有利于酒精发酵。

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。