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- Scattering center model describes the scattering characteristic of radar targets in optical region. 散射中心模型是描述光学区雷达目标电磁散射特性的重要工具。
- T hen we analyze the target scattering center model, angle movement model and the simulation of radar target range profile based on these models. 并具体分析了目标的散射中心模型、角运动模型及根据这些模型进行目标一维距离像仿真的方法。
- B group(42 cases) received BCG polysaccharide and nucleic acid preparation [1 mg(2 branches),every 2 d for 1 dose,im]. B组(42例)肌肉注射卡介菌多糖-核酸注射液[1次/2 d,1mg(2支)/次];
- This method takes full advantage of GA's inherent parallelism and solves the estimation problem of the equivalent scattering center. 该方法充分利用遗传算法的内在并行性,解决了二维等效散射中心的估计问题。
- With regard to eNOS,at 2 d,3 d and 7 d post pMCAO,group B performed significant difference with group C and group D. eNOS阳性表达2、3、7d;各组之间比较差异有统计学意义(P?0.;05)。
- This work is done by using a set of parameters about radar scattering center as target features and by using HMMs as classifiers. 主要研究内容包括两个方面:(1)基于散射中心位置参数特征和连续HMM分类器的识别方法及其仿真实验;
- Matra - Marconi's "tax" 2 C (R05) or 2 D (modified after the R06 and R07) satellite communications equipment. 马特拉-马可尼公司的“赋税”2C(R05)或2D(改装后的R06和R07)卫星通信设备。
- I n the light of the high-resolution frequency-stepped millimeter wave (MMW) radar , we consider that a radar target is made up of some strong scattering center. 针对高分辨阶梯变频毫米波雷达,将目标看成是由若干个可以单独分辨开的强散射中心组成。
- The reconstruction of the 3 D deformed paleostructures should be considered as the superimposition of 2 D deformation. 三维变形古构造恢复一般应视为二维变形的某种叠加,叠加方式视断裂总体变形特征而定。
- However,it had some limitation in partial deformity of surficial body, not better than the 2 D images. 但有其一定的局限性,对部分体表畸形检出不及二维探头。
- Based on attributed scattering center model, on the basis of reference [6], a modified method of extracting SAR target scattering center features from imagery domain is presented. 本文基于属性散射中心模型,在文献[6]的基础上,提出了一种改进的图像域SAR目标散射中心特征提取方法。
- These results suggested that two immunosuppressants of CsA and 1,25(OH) 2 D 3 , combined use at low doses might be an effective therapy for EAT. 提示 :小剂量免疫抑制剂 Cs A和 1,2 5 (OH) 2 D3 联合防治 EAT有效 ,并具有协同作用。
- In addition, after 10 cycles of end-of-day far-red irradiations (EOD FR), the heading and flowering date of the mutant was delayed for 2 d. 另外,在育性转换敏感期每日主光期结束时(EOD)进行10次短暂的远红光(FR)照射。 结果表明,农垦58S植株抽穗和开花期比SD处理推迟2d,而花粉败育率、种子结实率却无变化。
- Different from the standard algorithm,the fast 2 D back projection(2D FBP)proposed in this paper requires computational time O(N 2 log N 2). 本研究提出一种快速二维反投影算法 ,其计算量仅为O(N~2 log_2~N )。
- The undamped exponential model and CLEAN method are used in the extraction algorithm to transform 1-D scattering center extraction into non-linear optimization problem with genetic algorithm. 它采用非衰减指数和模型与CLEAN方法,将每个散射中心的提取转化为一个非线性优化问题,并利用遗传算法进行优化求解。
- The Luo Rudy models (LRd00) of mammalian ventricular cell were used in simulating of two dimensional (2 D) ventricular tissue. 用Luo Rudy心室肌细胞动作电位模型LRd0 0进行二维心室肌组织仿真研究。
- When the parameter estimation of Damped Exponentials (DE) based scattering center model is considered in real life situation, the noise is always non-Gaussian and has long-tailed distribution. 实际条件下,在对基于衰减指数(DE)和模型的雷达目标散射中心参数估计和特征提取时,其噪声背景往往是非高斯的,分布密度函数表现出长拖尾性质。
- Mudde.R.F,Van Den Akker.H.E.A,2 D and3 D simulations of an airlift loop reactor of the basis of a two-fluid model,Chem.Eng. 赵飞.;外环流反应器中气体分布及气液两相的计算流体力学研究[D]
- Extracting main scatter center of the target correctly and accumulating the energy of the main scatter center are the key to the high resolution radar range extension target detection. 正确提取目标强散射中心,并对强散射中心的能量进行有效的积累,是高分辨率雷达距离扩展目标检测的关键。