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The systematic experiment of conservation tillage in two crops a year region has been designed and performed according to the maximum benefit of resources, environment and production, based on the research achievements of conservation tillage technology in one crop a year regions. Series experiments and embedded theory study have been conducted for estimating the feasibility of water saving in conservation tillage and guiding irrigation. At the same time, the evaporations of soil water under the condition of conservation tillages are measured and its mathematic model is studied and significant research achievements have been obtained.

中文文摘：为研究一年两熟地区实行全程保护性耕作技术体系的可行性，选择出适宜该地区一年两熟的保护性耕作技术体系和提供指导灌溉用水的理论依据，论文在一年一熟地区保护性耕作体系研究成果的基础上，以一年两熟地区全程保护性耕作体系的资源环境效益和生产效益为依据，进行了深入的理论分析和田间试验研究；同时进行了保护性耕作条件下，土壤水分棵间蒸发的专项试验及模型研究，取得了重要的研究进展。

The systematic experiment of conservation tillage in two crops a year region has been designed and performed according to the maximum benefit of resources, environment and production, based on the research achievements of conservation tillage technology in one crop a year regions. Series experiments and embedded theory study have been conducted for estimating the feasibility of water saving in conservation tillage and guiding irrigation. At the same time, the evaporations of soil water under the condition of conservation tillages are measured and its mathematic model is studied and significant research achievements have been obtained.

为研究一年两熟地区实行全程保护性耕作技术体系的可行性，选择出适宜该地区一年两熟的保护性耕作技术体系和提供指导灌溉用水的理论依据，论文在一年一熟地区保护性耕作体系研究成果的基础上，以一年两熟地区全程保护性耕作体系的资源环境效益和生产效益为依据，进行了深入的理论分析和田间试验研究；同时进行了保护性耕作条件下，土壤水分棵间蒸发的专项试验及模型研究，取得了重要的研究进展。

The test data of mechanical properties showed that the tensile strength and the elongation at break of PUE reached the maximum value as 46MPa and 732% respectively when THEIC mass fraction up to 10%.

力学性能测试结果表明：当赛克质量分数为10%时，PUE的拉伸强度和拉断伸长率达到了最高值，分别为46MPa和732%。

The experimental results show that the erosion behavior is similar to that of brittle ceramic materials while the maximum erosion is found to occur at a jet angle of 90 degrees. The successive spalling of splats ...

结果表明：Cr3C2 NiCr涂层的冲蚀磨损呈现脆性材料的冲蚀磨损特征，在 90°冲蚀率最大；磨料冲击引起的裂纹沿涂层内粒子界面萌生、扩展并最终导致粒子剥落，是涂层主要的冲蚀磨损机制。

Moreover,the results of pollution load analysis showed that NH_4~+-N,TN and TP load rates of unicellular periphyton positively impacted on the corresponding removal rates.The maximum removals of NH_4~+-N(81.0%)and TN(65.0%) occurred at the corresponding loads of 0.87 mg NH_4~+-N·g Chla~(-1)·d~(-1)and 0.40 mg TN·g Chla~(-1)·d~(-1),respectively.

通过负荷率分析发现，颗粒态周丛藻类的NH_4~+-N、TN和TP负荷率和相应去除率均呈正相关，对NH_4~+-N、TN的最佳去除率分别出现在相应负荷率为0.87mgNH_4~+-N·gChla~(-1)·d~(-1)(81.0%)和0.40 mgTN·gChla~(-1)·d~(-1)(65.0%)时。

Aiming at the uncertainty problem of crack character and location of concrete outside the pen-stocks, the cracking area of concrete outside the penstocks of the Three Gorges Hydropower Station under designed load is obtained by using nonlinear 3D-FEM. And the likely maximum width of crack of penstock concrete is also worked out.

针对三峡压力管道外包混凝土裂缝性状和位置的不确定性问题，通过对三峡压力管道的三维非线性有限元分析，得出了在设计荷载作用下三峡压力管道外包混凝土开裂区域位置，并给出了管道混凝土可能的最大裂缝宽度值。

Results: When the top shape of osteotomes was concave,displacement and tensile stress were the maximum at the maxillary sinus floor.

目前，在临床中，骨挤压器顶端形状分为凸形、平形和凹形3种，对于哪种形状的骨挤压器在窦底提升术中提升效率高，对窦底的损伤小，目前观点不一致。

AC~61?aC. The thick, homeotropically aligned LC cell with copper sheets used for mylar and electrodes, and the use of electrical field to let the tuning of phase up to 90?a, which equivalent a THz quarter wave plate. The maximum phase shift of 92.2?a was achieved at 1.00 THz when the interaction length was 524 ?

我们使用垂直配向的液晶厚样品，并以铜片作为样品电极和垫片，以及利用电场控制液晶的排列，让液晶盒能够调制相位超过90度，因此可将它当作一个兆赫波段的四分之一波片。

The dynamic phasor model is based on the time-varying phasor, which not only breaks the quasi-stationary assumption, but also overcomes the maximum step size constraint of regular transmission line, so it can be used to analyze the fast electromagnetic transient phenomena at a higher speed.

传统的机电暂态模型由于建立在&准稳态&假设基础之上，因此不能用来仿真变化迅速的电磁暂态过程，而电磁暂态模型，虽然能准确反映电磁暂态过程，但由于仿真步长很小，仿真速度受到限制，不适合用来仿真大型电力系统。

Because the threshold exposure levels for photic damage to the retina at each wavelength of the optical spectrum are well known, it is fairly simple to calculate the maximum permissible filter transmittance that will provide adequate retinal protection from sunlight.

由於每种波长光线的极限值都已被测定，所以要计算出安全太阳滤镜最高允许透光率是很容易的。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。