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251.
In this paper,by means of similarity transfomations,we obtain explicit solutions to the cubic-quintic nonlinear Schrdinger equation with varying coefficients,which involve four free functions of space.Four types of free functions are chosen to exhibit the corresponding nonlinear wave propagations. 相似文献
252.
同介质中同能量密度的化学炸药爆炸满足爆炸相似律,在此类化爆实验中,缩比实验作为一种经济有效的实验方法被广泛采用。一些研究人员进行化爆缩比实验时,为了保证实验安全,通常会在实验中加入砂墙,起到吸收爆炸能量,消减冲击波的作用。为了研究砂墙消波吸能效应对化爆相似律的影响,建立了同介质中同能量密度化学炸药爆炸的一维计算模型,并利用两相流程序对三种缩比条件下(1∶1/1∶5/1∶10)的物理模型进行了数值模拟。数值计算结果显示:由于砂墙的吸能效应,化爆不再满足相似律。 相似文献
253.
Paul Williams 《Nonlinear dynamics》2008,52(1-2):159-179
A methodology for deployment/retrieval optimization of tethered satellite systems is presented. Previous research has focused
on the case where the tether is modeled as an inelastic, straight rod for the determination of optimal system trajectories.
However, the tether shape and string vibrations can often be very important, particularly when the deployment/retrieval speed
changes rapidly, or when external forces such as aerodynamic drag or electrodynamic forces are present. An efficient mathematical
model for flexible tethered systems is first derived, which treats the tether as composed of a system of lumped masses connected
via inelastic links. A tension control law is presented based on a discretization of the tether length dynamics via Chebyshev
polynomials. A scheme that minimizes the second derivative of length over the trajectory based on physically meaningful coefficients
is presented. This is utilized in conjunction with evolutionary optimization methods to minimize the rigid body and flexible
modes of the system during deployment/retrieval. It is shown that only a very small number of parameters are required to generate
accurate trajectories. The results are compared to the case where the tether is modeled as a straight rod. 相似文献
254.
With the help of the conditional similarity reduction method,
some new exact solutions of the (2+1)-dimensional modified dispersive
water-wave system (MDWW) are obtained. Based on the derived solution,
we investigate the evolution of solitons in the background waves. 相似文献
255.
Coherent X-ray microscopy has advanced towards higher-energy, more brilliant sources over the past decade since its demonstrations, and many advancements have been made towards optimizing this imaging technique. Here we present both the experimental instrument for obtaining diffraction patterns and the primary reconstruction of yeast cell 2D projection. In addition, the characteristics of the existing optics at BL29XUL of SPring-8 Facility and the method of image reconstruction are discussed. 相似文献
256.
Conditional Similarity Solutions of the Boussinesq Equation 总被引:2,自引:0,他引:2
The direct method proposed by Clarkson and Kruskal is modified to obtain some conditional similarity solutions of a nonlinear physics model.Taking the (1 1)-dimensional Boussinesq equation as a simple example,six types of conditional similarity reductions are obtained. 相似文献
257.
258.
在乳腺X线图像肿块检测中存在较高的假阳性率,通过基于内容的肿块检索,将待判定肿块与已确诊肿块进行相似性分析,可有效降低假阳性率.本文提出了一种结合可区分锚点图哈希和线性近邻传递的乳腺图像肿块检索方法.针对传统锚点图哈希在相似度定义中没有考虑病理相关性的问题,引入病理类别至锚点图哈希图像相似度计算,提出了可区分锚点图哈希以重新表示图像.利用线性近邻传递作为相关反馈技术,基于图像底层特征表达与图像高层语义间的学习机制,实现交互式肿块图像检索.采用北京大学人民医院乳腺中心提供的临床图像作为实验数据,实验结果表明,引入病理类别的可区分锚点图哈希图像表达在肿块相似性分析上优于传统锚点图哈希.相比于现有方法,本文提出的方法在肿块检索性能上得到明显提高. 相似文献
259.
Cruz Meneses-Fabian Gustavo Rodriguez-Zurita Maria-del-Carmen Encarnacion-Gutierrez Noel I. Toto-Arellano 《Optics Communications》2009,282(15):3063-3068
A method to reduce the number of captures needed in phase-shifting interferometry is proposed on the basis of grating interferometry and modulation of linear polarization. The case of four interferograms is considered. A common-path interferometer is used with two windows in the object plane and a Ronchi grating as the pupil, thus forming several replicated images of each window over the image plane. The replicated images, under proper matching conditions, superpose in such a way so that they produce interference patterns. Orders 0 and +1 and −1 and 0 form useful patterns to extract the optical phase differences associated to the windows. A phase of π is introduced between these orders using linear polarizing filters placed in the windows and also in the replicated windows, so two π-shifted patterns can be captured in one shot. An unknown translation is then applied to the grating in order to produce another shift in the each pattern. A second and final shot captures these last patterns. The actual grating displacement and the phase shift can be determined according to the method proposed by Kreis before applying proper phase-shifting techniques to finally calculate the phase difference distribution between windows. Related simulations and experimental results are given. 相似文献
260.