蚀的

Experiments that use single-pulse laser to ablate small steel ball in atmosphere were conducted.

采用单脉冲激光进行了大气环境下激光烧蚀小钢珠实验，得到其推进效应参数，发现并分析了钢珠在不同放置位置时不同的物理现象；为了得到一系列定量实验数据，采用自行研制的激光冲量靶仪进行了单脉冲激光烧蚀推进效应实验测试，得到了不同环境条件、不同靶材料的激光推进效应参数，并与国外的实验数据以及数值计算结果进行了比较。

We deduce the formula of the critical thickness of ablator, and put forward the rule of how the thickness of ablator affect the velocities and the stability of flyer.

理论上从阻抗失配效应的临界密度公式，推导出了烧蚀层的临界厚度，并推广到飞片的情形，提出了烧蚀层厚度对飞片速度和稳定性的影响规律。

According to the shape of the ablator surface the particle concentration and angle versus time was obtained through projection which can then be used to calculate the critical thickness of char layer. According to this thickness whether or not char layer been ablated is decided.

计算过程中根据烧蚀求解区域的变化自动生成网格并实现了局部加密，根据烧蚀型面进行投影获得了随时间变化的浓度和角度分布，并将其用于计算当前时刻的临界炭层厚度作为判断炭层脱落的依据。

The calculation shows that with air-breathing propulsion, the maximum velocity is limited.

计算分析发现：空气呼吸模式推进飞行器的最大速度有限；烧蚀模式可以使飞行器产生很高的速度，提高冲量耦合系数和比冲，有利于提高飞行器的最高速度；两种模式相结合的推进方式提高了有效载荷比，但能源利用效率比烧蚀模式要低。

The influence of polymerization degree and alcoholysis degree of polyvinyl alcohol, the ratio of Span - 20 to Tween - 20, the amount of polyvinyl alcohol, the amount of water - soluble inhibitor, pretreatment and after - treatment processes and et al on the hydrophobic property and stability of the water -repellent is investigated.

研制了一种以聚乙烯醇、2种非离子表面活性剂——Span-20和Tween-20、水溶性缓蚀剂等为原料的水性憎水剂；考察了聚乙烯醇的聚合度和醇解度、2种非离子表面活性剂之间的配比、聚乙烯醇含量、乳化剂含量、水溶性缓蚀剂含量、预处理和后处理工序等因素对憎水剂憎水效果及稳定性的影响。

The results show that the erosion volume grows with the increment of pump pressure, there are best rock-breaking jet length, abrasive concentration and particle size. In low concentration, the erosion energy of post-mixed pulsed abrasive jet is close to the pre-mixed pulsed abrasive jet. After the external fluid is drawn in, the jet dynamic pressure increases by 7%, while pulse amplitude increases by 150%.

结果表明：冲蚀体积随泵压增大而增加，存在破岩的最佳喷距、磨料浓度和磨料粒径；在较低浓度下，后混合磨料脉冲射流的冲蚀性能较接近于前混合磨料脉冲射流；引入外部流体后射流的动压力增大了7%，脉冲幅值提高了1.5倍。

An evaluation and screening program for the corrosion inhibitors of oil and gas wells is discussed in this paper.

讨论了一套适合于油气井的缓蚀剂评选程序，该程序遵循简便、快速、经济、可靠的原则，为现场筛选经济有效的缓蚀剂提供了一种方法。

Meanwhile, we have also obtained the result that the average ablation vel...

同时，得到中心区的平均烧蚀速度为10m/s数量级，它远小于产生的烧蚀等离子体的喷发速度。

The relationship between molecular structure of the compounds and the inhibition efficiency has been investigated by ab initio quantum chemical calculations.

同时用量子化学中的从头算方法对缓蚀剂的分子结构与缓蚀性能的关系进行了研究。

Each Saros series manifests as at least two North Node eclipses, marked N in the prenatal eclipse table linked below, and at least two South Node eclipses, marked S.

每一个沙罗周期最少发生两次的北交点日蚀，在如下附注的表格中标记为&N&，和最少两次的南交点日蚀，同样在下面的表格中标记为&S&

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。