预防法

Having studied the relation of oil well paraffine precipitation and the rod load, the paper finds one new method to predict the oil paraffine precipitation ---statistics comparison of the indicator diagram, and calculates the paraffin removal cycle as well as the paraffin removal time And predicts the oil well paraffin precipitation; Combined with the test data of oil field and the basic production parameter of the oil well system, the paper has carried on close analysis of the efficiency of the single well system, and obtained each target reflecting the system operation; the efficiency of the oil pumping mechanical well system has been improved and the submersion pressure mathematical model has been completed, and the author draws up the dynamic control chart of sub-area system efficiency, thus raises the management level in the oil well system efficiency.

通过研究油井结蜡速度与抽油机悬点载荷的关系，将油井结蜡与示功图结合到一起，找到一种对油井结蜡预测的新方法——示功图统计对比法，计算出清蜡周期与清蜡时间，预防了油井蜡卡；以现场示功图为依据，结合生产参数对抽油机井系统效率进行实测分析，完善系统效率与沉没压力的数学模型并绘制油井系统效率动态控制图，对系统效率进行了检测评价与优化。

The paper still analyses the reason of the drop bucket accidents caused by the hoisters' peccant hoisting. Besides, it establishes four models of artificial error and proposes "1421" preventive measures.

分析了因提升司机的人失误违章操作而导致坠斗事故发生的原因，建立了人失误四种模型，提出了&1421&法预防措施。

The method of washing, scraping and suction is effective on the prevention of halitosis and stomatitis in the patients with peroral endotracheal intubation.

冲洗刮吸法在预防经口气管插管患者口臭和口腔炎症中效果明显。

Passivation process also has some drawbacks, including hard buck coke catalyst bed treatment、polythionic acid stress corrosion cracking prevent for sensitively materials, meanwhile passivation process must be coordination between skillful local workers with knowledgeable company.

钝化法也有一些潜在的缺点必须注意，同时也是需要厂商负责保证，主要包括大块结焦废触媒的处理、钝化剂化学成分是否会对设备材质造成潜在伤害的确认及设备因敏化而产生聚硫酸应力腐蚀的预防等。

On these grounds, a new method, the divided steping reduction, was put forword to prevent sticking phenomenon for pre-reduced fluidized-beds of smelting reduction, i. e. concentrate is reduced under the temperature and composition of gas first for the thick morphology of iron, to a certain metallized rate, and then for the whiskery morphology of iron.

据此，提出了一种新的旨在预防熔融还原预还原流化床粘结现象的措施——分段还原法，即先将铁精矿置于铁以致密状析出的温度和气氛下还原至一定的金属化率，而后再在铁晶须析出的温度和气氛下进一步深还原。

Potentially offering an entirely new way to prevent heart attacks, researchers at University of Pennsylvania and Tufts University found that the drug doubled HDL in people with worrisomely low levels of the heart-healthy substance.

一种全新的途径很有可能用来预防心脏病发作，宾夕法尼亚大学和塔夫脱大学的研究者发现，该药可成倍升高涉及心脏健康的HDL在含量异常偏低患者的体内含量。

The model has the following features: 1 The security information provided by the assessment result is more dependable because of the consideration of some main uncertain factors; 2 The improved analytic method of power system DSR and the dynamic equivalent technologies are applied to reduce the computing time and to make the model more practical; 3 Step-up assessment strategy is adopted in order to balance the precision and computing time requirements; 4 Decompounding of system insecurity indexes to each system component, or to each generator and consumer, and the visualization of assessment results, will help the operators to understand the security status of the power system more clearly; 5 The assessment results can be beneficial to the preventive control in traditional power systems and the security pricing in power market environments.

模型具有如下特点： 1由于综合考虑了一些不确定因素对系统安全性的影响，使得评估结果更加可靠； 2采用求解电力系统动态安全域的改进解析法，结合动态降维技术，大大减少了动态安全域的计算时间，使得模型比较实用； 3采取逐步递进的评估策略，以适应计算精度和计算时间要求； 4可定量分解出各元件或各发电与用户对系统不安全的贡献，配以形象直观的评估结果显示，使操作人员清楚了解系统的安全状况； 5评估结果在传统电力系统可帮助制定预防控制措施，在电力市场可用于安全性定价。

This method can effectively prevent the gangrene of exteriorized sigmoid colon stump and gives no permanent fecal incontinence.

术中切断肛门括约肌和肛管直肠环法，是预防经腹肛拖出式直肠癌术后肠管坏死的有效方法，一般术后不会出现肛门长久性的大便失禁。

In this paper, the finite element method was applied to the vibration characteristic analysis for the upper bracket and head cover of a certain large-scale hydropower generator unit.

采用有限元法对某大型水轮发电机组的上机架和顶盖结构进行了振动特性分析，得到了结构的自振频率和相应的振型，结果表明：顶盖产生共振的可能性较大，应加以预防。

Objective:To measure the valences of serum anti-A IgG in pregnants by microcolumn gel assay so as to prevent the occurrence of neonatal hemolysis.

目的探讨应用微柱凝胶法技术检测O型血孕妇血清中IgG抗A血型抗体的水平，以预防新生儿溶血病的发生。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。