捕食者-食系统的捕获优化问题

对两种群捕食者-食系统捕获与优化问题进行了定性分析,并讨论了其生态意义,求出了利润最大时的最佳投入.     

Historical and probabilistic structural analysis of the Royal ditch aqueduct in the Alhambra (Granada)

The structural and historical analysis of the aqueduct of the Alhambra is presented. In the 13th century, Muhammad I built the palatial city of the Alhambra. To provide a water supply, Muhammad I built an irrigation ditch, known as the Royal ditch. The aqueduct was reconstructed in the 18th century in ashlar masonry to replace the original one. This work analyzes the history, geometric modeling, materials and stability of the aqueduct. Due to difficulties in testing and measuring the properties and loads, the Monte Carlo analysis technique is used to analyze stability, where the input parameters are defined as probabilistic distributions. Monte Carlo analysis provides the probability of risk of collapse defined by the geometric security coefficient obtained by means of the theory of limit analysis. Additionally, this technique is used to optimize the thickness of the arch.     

高强度间歇运动对长期住院男性精神分裂症患者精神症状、康复疗效影响的研究

目的:探讨高强度间歇运动(HIIT)对长期住院男性精神分裂症患者的精神症状及康复疗效的影响。方法:将58名长期住院男性精神分裂症患者便利抽样分为对照组、研究组,研究组开展HIIT,共6个月。结果:两组患者的阳性和阴性症状评定量表(PANSS)、住院精神病人康复疗效评定量表(IPROS)、卡尔加里精神分裂症抑郁量表(CDSS)评分显著降低。患者CDSS 、IPROS评分在干预后3个月和6个月时,研究组优于对照组,差异有统计学意义(P<0.05)。结论:HIIT可以改善长期住院男性精神分裂症患者的精神症状,提     

关于参数的区间估计探讨

论述了区间估计的定义、评价标准及其计算方法 .以正态总体均值的区间估计为研究对象,阐明了如何恰当地构造分布,确定置信限,得到高精度的区间估计.     

第二类Fredholm积分方程的小波解法

本文先介绍了第二类Fredholm积分方程的一般数值解法,然后自主讨论了利用区间小波做基底对所求的函数进行逼近,并迭代得到了相对于一般的Galerkin方法收敛程度高的数值结果,表明了此小波解法方法相对于一般数值解法的优越性.