查询词典 Fresnel diffraction

In this dissertation,Co-Cr2O3 and Fe-Cr2O3 granular films with superiorproperties have been successfully fabricated by RF co-sputtering technique underroom and 77K substrate temperatures for the first time.The microstructure,electrical transport and magnetic properties as well as their relation to TMR effectare systematically investigated by various techniques such as X-Ray diffraction,transmission electron microscopy,electrical diffraction,X-Rayphotoelectron spectroscopyand VSM,etc.,the change of electrical transportand magnetic properties in these films with their microstructure is also shown.Someinteresting and valuable results have been obtained after the theoretical fitting ofexperimental data with the existed theory.The temperature dependence of TMReffects in these films and the way to get larger TMR effect is also studied.Our mainprincipal results obtained are as follows:(1)Microstructure and Magnetism

在本论文中，我们采用射频共溅射方法，在室温及77K的衬底温度下首次成功地制备了性能优异的Co-Cr2O3及Fe-Cr2O3系列颗粒薄膜，并利用X-Ray衍射、透射电镜、电子衍射、X-Ray光电子谱及宏观电性及磁性测量等手段详细地研究了Co-Cr2O3颗粒膜的微结构、电性、磁性及它们与TMR效应之间的关系，系统地研究了薄膜的电性和磁性随薄膜微结构的变化，通过实验数据点的理论拟合，得出了一些有价值的物理信息，探讨了磁电阻效应的温度依赖性及获得较大TMR效应的途径，主要内容可概括如下

The results are verified from deep to extremely shallow water conditions. The shoaling waves, standing waves, 3D disturbance waves, tidal waves and solitude waves are simulated and verified,and waves over an underwater bar,the diffraction near single breakwater, breakwater gap, offshore breakwater, Breakhoff experiment are taken into account in this model. Furthermore, the wave harbor resonance under special topography, and "Bragg" resonance are simulated. The wave refraction problem under current fields,the nonlinear wave refraction-diffraction under "Arthur" current field, and the wave propagation under slowly varying current field are studied. The favorable calibrations show the model's feasibility in dealing with the wave nonlinearity and simulation in both deep and shallow water.

论文对深水至极浅水非线性波进行了较全面的验证，计算模拟了波浪浅化、立波、三维干涉波、潮波、孤立波以及波浪越过潜堤、单突堤绕射、双突堤绕射、岛式堤、Berkhoff实验和多连通水域波浪传播等问题，还对特殊地形条件下波浪发生港湾共振、布拉格共振进行了仿真；论文研究了水流中波浪传播折射变形问题，Arthur流场上非线性折射-绕射、水位缓变的转向潮流中波浪传播等缓变水流中波浪问题，各类问题的较好解决验证和表明了本文模式与方法具有适用于深浅水的可计算性与非线性。

Diffraction by helices It may be shownthat the intensity distribution in the diffraction pattern of a series of points equally spaced along a helix is given by the squares of Bessel functions.

衍射螺旋这可能是显示的强度分布的衍射图样的一系列点同样距离的沿螺旋给予的平方贝塞尔函数。

The paper studies the calculaton of wave force on large scale cylinder. Using the linear wave diffraction theory to compute wave force on the large scale cylinder, the paper presents a Nystrm method to solve the problem of the linear wave diffraction.

主要考虑大尺度墩柱上的波浪力的计算，应用线性水波绕射理论来计算作用在大尺度墩柱上的波浪力。

The bioactivity of titania coatings before and after modification were investigated by simulated body fluidtests in vitro.X-ray diffraction,Scanning electron microscope,Fourier transform infrared spectroscope and Energy diffraction spectroscope were used to investigate the microstr...

结果表明：氧化钛涂层和钛合金基体的结合强度较高，其值高达40MPa，涂层的耐模拟体液腐蚀性优于钛合金。酸和碱溶液表面改性后的氧化钛涂层经模拟体液浸泡可在其表面生成含有碳酸根的羟基磷灰石，显示良好的生物活性。

Diffraction peaks mainly appeared in 1°-2° on X-ray diffraction spectrum of mesoporous materials.

介孔x衍射图谱主要在1°~2°出现衍射峰，一些0.6°~0.9°的峰可能由仪器设置、样品制备不当所致。

In this study, the traditional angular spectrum method of diffraction simulation is improved. By introducing band-with limitation, a new method is put forward, which is suitable for diffraction simulation both in far and near field.

本文对传统的角谱法衍射计算做出改进，通过引入带宽限制给出一种新的衍射计算方法，能同时兼顾近场和远场的衍射分布计算。

The product was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and transmission electron microscopy. Silver crystals were monocrystalline with face-centered cubic structures, which was confirmed by electron diffraction and XRD.

利用透射电子显微镜、X射线衍射和傅里叶变换红外光谱对复合纳米微粒的形貌及其成分进行了表征。X射线衍射和电子衍射证明银纳米微粒具有良好的面心立方体单晶结构。

Pressure induced amorphous transition of LiB 3O 5 has been investigated by using in situ high pressure X ray powder diffraction and energy dispersive X ray diffraction with synchrotron radiation at the pressure up to 45 1GPa.

采用X射线粉末衍射和同步辐射能散X射线衍射技术，对LiB3O5晶体进行了压致非晶化相变的研究，压力达45.1GPa。

By transmission electron microscope, selected area electron diffraction, powder X-ray diffraction, differential scanning calorimeter as well as self-devised drainage, the effects of metals on grindability, material size, hydrogen storage capacity and hydriding-dehydriding properties are emphatically researched. Fe、Co、Ni were added in pretreatment process of anthracite and the effects of the added metals are researched, also, the action mechanism of metals is discussed on the basis of experimental results.

通过透射电镜、选区电子衍射，X射线衍射、差式扫描量热分析以及自行设计的排水装置等分析测试手段，着重研究了储氢材料中金属对其可磨性、粒度大小、储氢密度、吸放氢性能等的影响，在无烟煤的预处理过程中添加了Fe、Co、Ni三种金属，研究了所添加金属对材料储氢的影响，并在实验结果的基础上探讨了储氢材料中金属的作用机理。

I hope that this success is just the first in a long series.

我希望这只是成功的开始。

Three dimensional stresses on the interface of tire and soil, tire deflection and soil sinkage are measured.

测试轮胎——沙土界面上的三向应力、轮胎变形和沙土沉陷；建立考虑剪切应力对沙土承载特性产生影响的车轮牵引性能预测模型；分析车轮作用下土壤的纵向稳定性。