MAP-NSF算法的收敛条件和适用范围扩展

为了拓宽最大后验概率-噪声子空间拟合（MAP-NSF）算法在信号到达角估计上的适用范围,针对通道特性失配和非结构误差两种阵列扰动模型,对MAP-NSF算法的信号到达角估计问题进行了讨论。给出了两种误差模型参数化之间的关系,通过分析,得到了在非结构误差模型下MAP-NSF算法的收敛条件,同时证明了在通道特性失配模型下,MPA-NSF算法可适用于有限样本误差与非结构误差与非结构误差不同量级时的情况。数值仿真结果证实了所得到结论的正确性。     

Bi-2212超导体中氧原子位移调制的计算机模拟

根据Bi系超导体的结构特点提出了BiO层中O原子位移调制的结构模型.通过计算机模拟计算了Bi-2212相A型调制结构的选区电子衍射和会聚束电子衍射花样.计算结果表明,O原子的位移调制对电子衍射花样中调制衍射斑的影响甚大,不容忽视.而会聚束电子衍射对O原子的位移更敏感,利用这一特点,进一步调整BiO层中O原子的位移,使模拟计算的电子衍射花样和会聚束电子衍射花样与实验结果完全一致.     

南水北调中线工程西甘池试验洞收敛变形反分析

利用南水北调中线西甘池试验洞变形量测数据,采用三维有限差分程序FLAC~(3D).进行反分析计算,所得围岩地质力学参数和现场原位试验结果基本一致,使用的方法和所得结论可用于隧洞围岩稳定计算、优化设计和指导施工.     

Development and validation of the Refugee Trauma Experience Inventory.

This article reports the development and validation of a new self-report measure, the Refugee Trauma Experience Inventory (RTEI). This scale was designed to assess refugees’ traumatic experiences. The RTEI was administered to 226 Tibetan refugees (113 men and 113 women) residing in India. Principal-components analysis generated 3 factors—Survival Trauma, Ethnic Concern, and Deprivation–Uncertainty. Three subscales and the Total scale showed high internal consistency. The factors derived from this scale correlated moderately to strongly with theoretically related constructs such as intrusion, avoidance, rumination, and posttraumatic schema changes, namely negative cognitions about the self and world and self-blame, thus endorsing the RTEI’s convergent validity. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Construct validity of the Wechsler Abbreviated Scale of Intelligence and Wide Range Intelligence Test: Convergent and structural validity.

The Wechsler Abbreviated Scale of Intelligence (WASI; Psychological Corporation, 1999) and the Wide Range Intelligence Test (WRIT; Glutting, Adams, & Sheslow, 2000) are two well-normed brief measures of general intelligence with subtests purportedly assessing verbal–crystallized abilities and nonverbal–fluid–visual abilities. With a sample of 152 children, adolescents, and adults, the present study reports meaningful convergent validity coefficients and a latent factor structure consistent with the theoretical intellectual models both tests were constructed to reflect. Consideration of the hierarchical model of intelligence tests and issues regarding test interpretation are presented. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

复平面或左半平面内收敛的L—Stieltjes积分的下级下上级

在上侧Laplace-Stieltjes积分的下级与上级理论基础上 ,对下侧L -S积分定义的整函数f2 (s)定义了下级与上级 ,通过引入递减负实数列 {λ-n} ,建立了f2 (s)的下级 (或上级 )与其系数及指数之间的关系 ,并拓广到双侧L -S积分所定义的整函数F(s) ;建立了在收敛半平面Re(s) =σ <0内的解析函数f2 (s)的下级与上级概念 ,并讨论了f2 (s)的下级 (或上级 )与其系数及指数之间的关系 ,推广了上侧L -S积分f1(s)的两个结论     

具有饱和治疗率的H7N9型禽流感模型的动力学性态分析

建立具有饱和治疗率的H7N9型禽流感模型,研究媒体报道和饱和治疗对禽流感传播的影响.定义模型的基本再生数,利用V函数、Dulac函数和极限方程理论等对模型进行动力学性态的分析.证明当基本再生数小于等于1时,无病平衡点全局渐近稳定;当基本再生数大于1时,地方病平衡点全局渐近稳定.数值模拟验证了本文的理论结果.     

Euler常数与Stirling序列的快速收敛法

对某些重要的收敛序列,借助几何直观方法估计了它们的收敛余项。     

一类在两个斑块内人口迁移的传染病模型的研究

建立了一类在两个斑块内人口迁移的传染病模型,得到了该模型的基本再生数R12和主特征值λ1,证明了若λ1〈0,则无病平衡点是全局渐近稳定的,即疾病在人口迁移条件下消失,若λ1〉0,则地方病平衡点存在,且是全局渐近稳定的,即疾病在人口迁移条件下持续存在．     

高压条件下密封环变形的控制

分析了高压条件下机械密封端面的变形情况及其对密封性能的影响,提出了密封环的压力变形机理和解决措施以及实际设计中的注意事项,列举了部分成功应用的实例。