Details of dcfs with the rip is analyzed , including the relation of dispersion and wavelength , variation of dispersion in the c - band , cutoff wavelength of the basic mode , distribution of scalar field and power , macro - bending loss at 1550nm . based on the optimized rip , impaction of radius of core and width of depressed cladding is studied . at the s ame time , a wavelength devision multiplexing system is designed 接着对这种结构的光纤作了分析，包括它的色散与波长之间的关系，色散在c - band的变动范围，标量场的分布，基模在光纤中的功率分布，在1550处的宏弯损耗等。
Computer fluid dynamics ( cfd ) is adopted to simulate the flow fields of catalytic converter while researching the working process of emission postprocessor . the velocity field and pressure field of exhaust gas are obtained . methods of structural optimization of catalytic converter for improving gas flow and conversion efficiency are proposed 本文在汽车排气后处理装置工作过程研究方面，运用计算流体动力学软件，对催化转化装置气流场开展了模拟，得出了气体速度场和压力场的分布情况，提出了以改善气体流动和催化转化效率的催化转化装置结构优化的方案。
In this article , according to heat conduction theory , elastic creep theory and finite element theory , the temperature field and creep stress field in the arch dam during construction and operation are simulated and analyzed by means of three dimensional finite element relocating mesh method , and the distribution law of the temperature field and creep stress field in the arch dam during construction and operation are systematically studied , and according to the construction process of concrete arch dam , the effect of lamination placement , construction interval , elastic modulus change , thermal insulation change , surrounding temperature change , concrete creep and autogenous volume change on thermal stress in the arch dam are also considered 论文根据热传导理论、弹性徐变理论及有限元理论，用三维有限元浮动网格法对拱坝施工期和运行期温度场、徐变应力场进行了全过程仿真分析，较为系统的研究了混凝土拱坝施工期和运行期温度场、徐变应力场的分布规律，在分析中按照混凝土拱坝施工过程，考虑了混凝土分层浇筑、施工间隙时间、弹模变化、绝热温升过程、环境温度的变化、混凝土徐变、自生体积变形等因素对坝体温度应力的影响。
At the same time we obtained that the shg conversion efficiency of the flattened gaussian beam is higher than that of the gaussian beam under the same condition ; in section 3 , we have computed the theoretical conversion efficiency of the thg on the flattened gaussian beam , where we also have worked out the type - i and type - 11 ( 1 ) thg conversion efficiency curves versus the same effectors , and found the flattened gaussian beams thg conversion efficiency is higher than that of the gaussian beam too ; in the section 4 , we have simulated the field distribution of the shg and thg wave on the flattened gaussian beam 在相同条件下，得出了平顶高斯光束的倍频转换效率高于高斯光束的倍频转换效率；第三章对平顶高斯光束在clbo晶体上的类和类混频转换效率与其影响因素的关系进行了数值模拟和计算，并同高斯光束进行比较，同样得到混频时，平顶高斯光束的转换效率高于高斯光束的混频转换效率的结论；第四章模拟计算了平顶高斯光束的倍频、混频波横向光场的分布形式，得到了谐波场仍为均匀平顶高斯光束的结果。
Magnetic anomaly detection is a kind of magnetic technology of target - detection . it is developed with the progress of magnetic sensors , which is based on the phenomena that ferrous objects disturbs the magnetic lines of force of the earth . so we can gain the neccesary informatin of the target through processing the data of the magnetic anomaly signatures . this technology has a wide perspective in the future . this paper will study the technoly of mad through a lot of experiment . the platform for the experiment is made 本论文通过大量实验对磁异信号目标探测技术进行了研究,研制了磁异信号目标探测技术试验平台,利用amr磁阻传感器开发了提取磁异信号特征量?磁梯度计,并基于磁场梯度计通过实验对模拟磁性目标的磁异常场的分布进行了研究,用图示法将其分布特征表现出来,发现了磁异信号测量的最佳角度,并给出了理论分析和结论。
( 2 ) on the base of winkler model , compute the anti - forces of pipeline without frusta , considering the loess cohesion . compute the distortion and force of pipeline under different length of collapse . and get the stress field and the greatest mises stress and its location ( 2 )以winkler线形地基模型为基础，确定无固定墩管道两端的地基反力，并考虑黄土的内聚力作用，计算了不同长度黄土坍塌发生时管道的受力和变形，给出了管道上应力场的分布和最大mises应力部位。
In this paper , based on the qinling - zhongnanshan long double - tube highway tunnel , the rule of temperature field , pressure field and smoke distribution in a long highway tunnel fire is studied . on the basis of this , safety system on the tunnel fire protection and rescue of the long highway tunnel are discussed deeply 本文以秦岭终南山特长公路隧道为对象，研究了火灾时隧道内温度场、压力场的分布以及烟雾的扩散规律，并在此基础上深入研究了长大双洞公路隧道火灾防灾救援安全体系。
Computing about five work conditions of slurry pump , the fields of velocity , compression and turbulence intensity are obtained , and the pump performance curves are also achieved to check the computation credence . based on the results of flow fields , particle tracks in varied conditions are achieved by using lagrange method 本文对渣浆泵的在5个工况下（包括设计工况）的清水流场进行了计算，得到了描述流场的速度、压力、紊流强度等参数场的分布情况，最后计算了泵的运行性能曲线来校核计算的可靠性。
In order to improve the properties of materials , one needs to understand the structural relationship between interface and matrix of the materials , such as interface atomic structure , misfit dislocation , chemical bond structure , stress field distribution , composition segregation etc . there are tremendous research works on the grain boundary and interface structures during last century and the sophisticated theory about grain boundary and interface , i . e . coincidence site lattice and 0 - lattice theories had been developed simultaneously 众所周知，材料的宏观性质是由其微观结构所决定的，因此，为了改善材料的宏观性能我们有必要弄清楚材料的界面与基体之间的结构关系，如界面的原子结构、失配位错、化学键合、应力场的分布等等。在上世纪，人们已对晶界和相界面结构进行了大量的研究，同时，相关的理论如“重位点阵”和“ o -点阵”理论也发展成熟。
Introduced a new way for dispersion compensation in transmission using uniform fiber bragg gratings . at the last , the analysis of fiber grating production with a phase mask was carried out . based on diffraction and interference theories , we access the near - field optical intensity distributions produced by a periodic mask and draw the important conclusion that we must put the mask near the fiber as we can in the experiment 最后论文讨论了光纤光栅的制作，分析了掩膜板后干涉光场的分布，指出了掩膜板制作应该尽量实现零级抑制，且在系统调试中，光纤要尽量靠近掩膜板放置这一重要结论，在此基础上利用现有实验设备制作出了光纤光栅，研究了不同曝光条件对光栅制作的影响，并利用实验分析了光栅的温度稳定性。
