做试验

The high-power system including main circuit, the charging and discharging circuit of synthetic circuit test system, and the principle of charging and discharging for current supply using electrolytic capacitor is presented. At the aspect of circuit breaker control, the advanced permanent magnetic actuator is used and analyzed in this paper, including the precision computation and using in synthetic circuit. The trigger circuit of voltage supply is designed, and the intelligent control is used to trigger the igniting gap. And the integraph based Rogowski coil is designed and employed the intelligent detection of breaking current.

强电系统介绍了合成回路试验系统的主电路及其充放电电路，讲述了电流源采用电解电容器的充放电原理；断路器控制方面，采用当前比较先进的永磁操动机构，并对永磁机构的原理、精度计算和在合成回路中的应用做了详细地分析；设计并制作了电压源点火回路，对球隙点火进行智能控制；在智能检测开断电流方面，设计并制作了与Rogowski线圈相配合的积分器。

Combining the experimental results and theoretical analysis, the following work has been accomplished.(1) Reasons of the decrease of interelectrode capacitance and the increase of discharge gap caused by the powder suspended in dielectric fluid are explained. And the mechanism that surface quality of workpiece improved by powder-mixed EDM is analyzed from this viewpoint.(2) The variation regularity of the percentage of silicon on the machined surface of workpiece has been summarized according to the experiment results when silicon powder was added into the working fluid. The entropy is introduced to explain the reasons for this variation regularity by thermodynamics.(3) The dimensional accuracy is greatly influenced by the overcut resulting from discharge gap and electrode wear in practice application. Empirical formulas for the overcut in EDM and powder-mixed EDM are established based on the experimental results using the ternary linear regressive method in this paper.(4) The influence of main factors on the machined surface characteristics has been evaluated based on the orthogonal experimental design method.

通过一系列普通电火花加工与混粉电火花加工的对比实验，运用工艺实验和理论分析相结合的方法，重点做了以下工作：(1)探讨了粉末颗粒导致极间电容减小、放电间隙增大的原因，并从这个角度解释了混粉电火花加工可以改善工件表面质量的机理；(2)以混合硅粉的电火花加工为例，实验得出峰值电流和脉冲宽度对加工表面层成分中硅元素含量的影响规律，并引入熵的概念从热力学的角度对硅元素含量变化的原因寻找了理论依据；(3)在实际加工中，由于粉末的加入使放电间隙变大，这使得混粉电火花加工的尺寸精度难以控制，本文利用三元线性回归的方法，在实验数据的基础上，建立了两种电火花加工过切量的计算公式；(4)将正交试验法应用于混粉电火花加工实验研究，并通过对实验指标极差的直观分析，得出各电参数对加工指标影响的敏感程度。

His internist didn't think it was his heart, and a normal stress test done the previous year seemed to confirm that.

他的内科医生并不认为他的心脏有病，前一年做的运动试验正常也似乎证实了这一点。

Monitor your ovarian health with semiannual pelvic exams by a gynecologist, annual pelvic ultrasound with an intravaginal probe, and blood tests for a special protein called CA-125. Consider participating in a clinical trial evaluating newer methods of early detection.

监测你的卵巢健康情况，每半年由妇科医生作骨盆检测，每年用阴道探针做骨盆超声，血液检测一种特殊蛋白叫做CA—125 ，考虑参加临床试验早期检测新方法的测评。

Next, the author discussed the application problem of the inversion, researched the controllable effects in inversion from different viewpoints.

可信度是反演中无法回避的问题，通常的反演需要做很多的试验才能获得可用的结果。

Using potato tubers of Irish cobbler variety naturally infected with X- and Y-virus, the writer compared the concentrations of X-virus in the young sprouts of different seed pieces longitudinally cut from the same tuber and subjected to various temperatures, light and darkness, normal and dereased oxygen tensions during the period of germination.

在定温箱内所做的发芽温度试验的结果指出，块茎在20℃中发出的幼芽内X-病毒的浓度最高，沉淀滴度一般在1/80—1/160之间，最高的达到1/320，千日红上平均半叶斑点数目约为30.16°及24℃中的病毒浓度相近，沉淀滴度约为20℃的1/2，斑点数目达20℃的2/3左右。28℃发出的幼芽内病毒浓度最低，平均沉淀滴度约在1/10—1/20之间，平均半叶斑点数目为11.9。

It's an experiment. I'm trying to change my bed karma.

我在做一项试验改变我的命运

Perhaps less than a kiloton, which sounds like a lot but is actually small as nuclear devices go.

也许不超过千吨当量，也许他们宣传的很大，但事实上根据他们的核设施，所做的试验是很小规模的。

Today The Lancet publishes the results of trials carried out at 121 centres in the United States.

今天，The Lancet发表了在美国121个研究中心所做的试验结果。

Having realized that I could use a kite to attract lightening, I decide to do an experiment.

在意识到可以使用风筝捕捉闪电之后，我决定做一个试验。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。