截面

The two-photon absorption cross-sections of these styryl derivatives were determined by Z-scan technique, and the benzothiazolium derivatives exhibited the largest TPA cross-sections (10〓s·cm〓/photon) and the best power limiting ability at high operable incident intensity. The results show that the benzothiazolium derivatives are promising organic compounds as two-photon absorption optical limiting materials. 2. Several organic dyes active to 800nm femtosecond laser with D-π-A structure were designed and synthesized.

研究了它们的上转换荧光、上转换激射和光限幅行为，通过改变染料分子共轭体系的大小，首次实现了在576nm-635nm范围内的双光子上转换激光波长的调节，其中噻唑啉碘盐类二苯乙烯化合物的双光子上转换激射峰（576nm）是迄今在1064nm皮秒激光作用下能够得到的最短波长的激光；阴离子显著改变上转换激射效率，但对上转换荧光峰和激射峰的位置影响很小；增加溶液的浓度，上转换荧光光谱和激射光谱红移，并在一定的浓度范围内，能够有效的提高上转换激射效率；利用Z-扫描技术测定了染料分子的双光子吸收截面，发现苯并噻唑类染料分子的双光子吸收截面高达10〓s·cm〓／photon，而且在较大的入射光强范围内，这类染料分子具有较大的光限幅能力，是一类作为双光子吸收光限幅材料很有潜力的染料分子。

The scale-type geometric wear-resistant structure surface is characterized in being made up of a base and the bionic geometric units on the surface. The bionic geometric structure unit is a scale-type structure distributed regularly on the surface of the base, and the distribution density is that: the ratio between the geometric projection area of the scale-type structure on the base surface and the surface area of the base formed by all the edge ends is 50-100%; the scale-type geometric structure unit has a symmetric hexagon shape on the surface; the sides L2/L1=1.0-2.0, L1: 1mm-50mm, and the internal angle Alpha is 120 degree -130 degree, the internal angle Beta is 100 degree -110 degree; the A-A section is subtriangular, and the B-B section is a trapezoid, the height H of the scale-type is 1-5mm.

本发明由基体和其表面上的仿生几何结构单元组成，仿生几何结构单元为在基体表面规律分布的鳞片型结构，鳞片型的分布密度为：其在基体表面上的几何投影面积之和与所有棱端围成的基体表面积之比为50-100％，鳞片型几何结构单元的表面形状为对称六边形结构：边长L2/L1＝1.0-2.0，L1：1mm-50mm，内角α为120°-130°，内角β为100°-110°，鳞片型的A-A截面为近似三角形，B-B截面为梯形，鳞片型的高度H为1-5mm。

Through anaslysing section real constant and weight of different parts and selecting different element type which are based on structure blueprint, we will build the ANSYS model.2. Unloader boom will be discrete based on trolly travelling on it.

根据卸船机的金属结构设计图纸确定卸船机各个部件几何尺寸以及具体位置，通过分析不同部件的截面尺寸以及重量计算其相应的截面性质和材料密度，以及不同的结构部件采用其相应的单元类型，从而建立抓斗卸船机作业时的载荷变化与运行的在ANSYS中数学模型。

The bearing capacity of the special steel tube column can be improved at least about 20% with rib stiffener.The effect of stiffening truss is unapparent though the stress distribution on tube wall is further reasonable.

对管壁采用内加劲肋方式处理后，截面承载能力提高20%左右，采用内桁架对管壁进行处理也可改善截面的应力分布，但在设计荷载作用下的效果并不显著。

This definitely affects the accuracy of both waer hammer pressure and hydraulic resonance calculation resuLlts.

目前，对非圆形截面，一般都参照圆形截面的水锤波速，进行分析计算，这必然影响水锤压力及水力共振计算结果的准确性。

The results show that grains at core are coarser and deformation bands are observed at surface,while microstructure both at core and at surface is composed of bainitic ferrite laths with high dislocation density and interlath cementite or residual austenite.Good uniforinity in h...

结合NQP钢连续冷却时的相变特点，分析其截面硬度波动在±1.5HRC内的原因在于其有较好的贝氏体淬透性，模块整个截面上都得到了均匀的贝氏体组织，贝氏体板条宽度和位错密度的差异使得其表层硬度稍高于心部。

The paper reviews the development in the analytical theory of mechanical behavior of composites, pointing out the problems existed, presenting creatively the concept of yarn state, solving the descriptive problem of perform structure of any woven composites and laying the foundation for predetermining the elastic behavior of 3-d woven composites with computer. On the basis of yarn state, the relative cross section deformation theory is introduced, the yarn cross section deformation is studied, and the experiential formula is described in the paper on the basis of experiment. The crimping state of yarn is studied, the classical "straight warp view"is modified, and the crimp height value of crimped yarn is studied. At the same time, with shrinkage rate sine method, the paper proposes the idea which imitate the shape of crimped yarn. With the third power template curve, the paper describes the microgeometry structure of fabric, finding a brief and precise approach for the calculation of mechanical behavior of composites.

本文回顾了复合材料力学性能分析理论的发展，指出了存在的问题，创造性地提出了纱态概念，解决了任意结构机织复合材料预制件结构表征问题，进而为用计算机预报三维机织复合材料的弹性性能打下了基础；基于纱态概念，提出了相对截面变形理论，研究了纱线截面变形情况，在实验的基础上给出了纱线截变经验公式；研究了纱线屈曲状态，修正了传统的&地经纱直线论&，提出了以纱线缩率研究屈曲峰谷值的思想，同时以三次样条曲线拟合了纱线的卷曲形状，较好地描述了织物的细观几何结构，为复合材料力学性能的计算找到了一条既比较简便又比较精确的途径。

During the research and fabrication, many problems encountered, especially principle tests, design of mechatronics system, synchronal control between press (cross-section correction) feeding and preforming/bending feeding and damped oscillation have been solved.

利用绕线机这套硬件设备和CICC超导磁体绕制技术的研究成果，发展了复杂截面铠装超导缆导体线圈的无张力绕制技术；确定了D形线圈的绕制工艺和NC控制程序，最终高质量地完成了复杂D形截面CICC纵场试验线圈的研制。

Through detailed theory analysis and formulas, the paper raveled out the limitation of big section and small section, and got conclusion that current transformer with big section and high quality PCB rogowski coils has the same measure principle as the one with ideal rogowski coils, which provides the theoretical basis for optimization design of current transformer with PCB rogowski coils and its application in the power system of mining area.

文章通过详细的理论分析和推导，解除了对截面大小的这一限制，得出大截面、高精度的PCB空心线圈电流互感器具有和理想空心线圈电流互感器相同测量原理的结论，为PCB空心线圈电流互感器的优化设计和在矿区电力系统中的应用提供了理论基础。

The ground floor column"s axial compressive force is especially big in high-rise buildings and skyscrapers . If using RC column ,it will lead short-column and "fat-column;if adopting steel structure ,it may reduce section area sharping,but its capacity of bearing erosion is weak,especially fireproof performance is its fatal weakness;SRC may not only reduce section area effectively,but also save steel,without the weaknesses in bearing erosion and fire-resistant capacity.

高层超高层建筑的底层柱轴力特别大，如果采用钢筋混凝土柱，会出现短柱和胖柱现象；采用钢结构，可以大大减小截面面积，但钢结构的耐腐蚀性能差，尤其是耐火性能成为它的致命弱点；而型钢混凝土既可以有效减小截面尺寸，又可以节省钢材，还没有腐蚀性和耐火性差这些问题。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷