射表示

3D reconstruction is one of the most challenging problems in computer vision. This project uses CAD model to increase the accuracy,robustness and speed of 3D reconstruction and five different works are conducted: 1 research on space curve 3D reconstruction method based on high curvature point nad turning point; 2 free-form curve 3D reconstruction based on B-spline and BURBS; 3 Active surface affine reconstruction based on single frame; 4 Matching and reconstruction of 3D sparse points; Data fitting method based on the iteration of nearest point.

三维重建是计算机视觉中公认的难题，本项目使用CAD模型来提高三维重建的精度、稳健性和速度的思路，围绕着空间曲线和曲面的三维重建和匹配开展了以下五个方面的研究：1）基于高曲率点和拐点分割的空间曲线三维重建方法研究；2）基于B样条和NURBS表示的空间自由曲线三维重建方法研究；3）基于单帧图像的有源曲面仿射重建；4）三维离散数据的匹配与重建；5）基于迭代最近点的数据拟合方法。

Ten parameters of Doyle-Turner expression of scattering factors have been accurately fitted, which include the elastic scattering factors of 98 elements crystals, TDS absorptive scattering factors of 43 elements crystals and absorptive atomic scattering factors of 17 important materials with the zinc blende structure.

对CCD相机的几何畸变进行了矫正。通过对高能电子衍射理论及散射机制的阐述，一方面利用模拟退火算法对原子的弹性和非弹性散射因子进行含10个参数的Doyle-Turner表示的拟合。

Then the brutal minions of the law fell upon the hapless Toad; loaded him with chains, and dragged him from the Court House, shrieking, praying, protesting; across the marketplace, where the playful populace, always as severe upon detected crime as they are sympathetic and helpful when one is merely 'wanted,' assailed him with jeers, carrots, and popular catch-words; past hooting school children, their innocent faces lit up with the pleasure they ever derive from the sight of a gentleman in difficulties; across the hollow-sounding drawbridge, below the spiky portcullis, under the frowning archway of the grim old castle, whose ancient towers soared high overhead; past guardrooms full of grinning soldiery off duty, past sentries who coughed in a horrid, sarcastic way, because that is as much as a sentry on his post dare do to show his contempt and abhorrence of crime; up time-worn winding stairs, past men-at-arms in casquet and corselet of steel, darting threatening looks through their vizards; across courtyards, where mastiffs strained at their leash and pawed the air to get at him; past ancient warders, their halberds leant against the wall, dozing over a pasty and a flagon of brown ale; on and on, past the rack-chamber and the thumbscrew-room, past the turning that led to the private scaffold, till they reached the door of the grimmest dungeon that lay in the heart of the innermost keep.

随后，粗暴的狱吏们扑向倒霉的蟾蜍，给他戴上镣铐，拖出法庭。他一路尖叫，祈求，抗议。他被拖着经过市场。市场上那些游手好闲的公众，对通缉犯向来都表同情和提供援助，而对已确认的罪犯则向来是疾言厉色。他们纷纷向他投来嘲骂，扔胡萝卜，喊口号。他被拖着经过起哄的学童，他们每看到一位绅士陷入困境，天真的小脸上就露出喜滋滋的神色。他被拖着走过轧轧作响的吊桥，穿过布满铁钉的铁闸门，钻过狰狞的古堡里阴森可怖的拱道，古堡上的塔楼高耸入云；穿过挤满了下班士兵的警卫室，他们冲他咧嘴狞笑；经过发出嘲弄的咳嗽的哨兵，因为当班的哨兵只许这样来表示他们对罪犯的轻蔑和嫌恶；走上一段转弯抹角的古老石级，经过身着钢盔铁甲的武士，他们从盔里射出恐吓的目光；穿过院子，院里凶恶的猛犬把皮带绷得紧紧的，爪子向空中乱抓，要向他扑过来；经过年老的狱卒，他们把兵器斜靠在墙上，对着一个肉馅饼和一罐棕色的麦酒打瞌睡；走呀走呀，走过拉肢拷问室，夹指室，走过通向秘密断头台的拐角，一直走到监狱最深处那间最阴森的地牢门前。

Furthermore,some circular arc spline curves which have C~0 or GC~1 continuity are constructed.

该表示形式中没有权因子和额外的控制参数，而且具有几何不变性、仿射不变性等良好性质。

The phase of optical wave can be recovered by the intensity transport equation under the paraxial approximation For the optical system with diffraction limit, it is difficult to get the boundary radical slope of phase and sample in the circular domain boundary when using the intensity transport equation to recover the phase, consequently, we reviewed an algorithm mentioned in the reference ［4］, namely, the equation, computation domain and boundary condition are changed, then the phase is reconstructed by the multigrid method and corrected at last Moreover, the experiment system is set to testify the algorithm, and the recovered phase from the intensity data detected by CCD is compared with the result from phase retrieval algorithm, it is found that the phase reconstruction error can reach 017 λ in the case of non-uniform intensity distribution, as a result, the method is suitable for the phase recovery with low wavefront sensing accuracy.

在傍轴近似条件下，可以利用光强传播方程对畸变波前进行相位恢复。对于衍射受限的光学系统，很难获得相位的边界径向斜率值作为边界条件，此外，要获得精确的圆域边界采样值也并非易事。为了克服上述困难，进一步研究了相位恢复改进方法，即改变了方程的表示形式、计算区域和边界条件，并用多重网格法进行求解获得重构相位，最后再将其修正。为了验证算法的精确性，搭建了实验系统对算法进行实验验证，将由CCD探测的光强分布进行计算得到的相位分布与相位恢复算法的结果进行比较，证明在光强分布非均匀的情况下，该方法恢复的相位均方根误差能够达到017 λ，可以适用于波前传感精度要求不是很高的相位恢复。标签自适应光学相位恢复相位修正光强传播方程 adaptive optics phase retrieval phase correction intensity transport equation

The nonlinear Winkler-Kelvin sub-grade model is adopted in this simplified model and the complicated 3-D problems of the soil-single piles dynamic interaction are simplified to the 1-D, that is to say, the lateral nonlinear acting force of the soil to the pile shift is simulated with thehorizontal nonlinear springs which have the continuous uniform distribution, while the nonlinear spring restoring force is described by the deteriorated Bouc-Wen model; the radiation damping and material damping due to the energy dissipation and inner friction in the soil are displayed with the dashpots which are in parallel with the horizontal nonlinear springs.

该模型采用非线性Winkler-Kelvin地基模型，将复杂的地基土-单桩动力相互作用的三维问题，简化为一维问题，即，地基土对桩轴的横向非线性作用力，由随深度均匀分布的水平非线性弹簧模拟，非线性弹簧恢复力由退化的Bouc-Wen模型描述；地基土中由于能量耗散和内部摩擦而产生的幅射阻尼和材料阻尼，由与水平非线性弹簧并联的粘壶表示。

We studied the influence of single magnetic impurity on the spin orientation of an incident electron, the scattering barrier can be expressed by the Rashba Hamitonian and delta function.

研究局域化磁性杂质引发的散射势对入射电子自旋取向的影响，该势可用Rashbah哈密顿项表示。

In other words, if you ejaculate within 2 minutes of entering the vagina, you suffer from premature ejaculation.

换言之，如果在进入阴道二分钟内即射精的话，就表示有早泄的问题。

As a consequence, the connection of ABCD theorem with the fundamental " uncertainty principle " in quantum mechanics had been established.

此外应用推广的ABCD定理，可导出推广的含ABCD的衍射积分定理，用角程函的导数来表示。

First, each shape is represented by the eigenvectors of an appropriately defined affinity matrix based on approximated geodesic distance, forming a spectral embedding which achieves normalization against rigid-body transformations, uniform scaling, and shape articulation (i.e., pose changing). This procedure is called the pose-oblivious transform.

首先，针对每一个形状都基于谱嵌入的方法求得其相应的谱嵌入表示，这里的谱嵌入是基于以近似测地距离为基础构造出的仿射矩阵的特征向量得到的，这一过程称为姿态无关变换，经过这一变换，模型的形状的描述符就具备了刚体变换不变、均匀缩放不变和姿态无关的特性。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。