基于时序InSAR的改进型PIM矿山采空区沉降模型构建与应用

利用InSAR监测矿山采空区地表沉降的过程中易在沉降中心周围产生失相干现象,导致形变结果缺失,无法获取准确的沉降区模型。基于此,提出了一种结合时序InSAR与PIM(Probability Integral Method)的监测方法,以云南省玉溪市大红山铁矿地下采区某工作面为研究对象,首先计算出时序InSAR累积沉降量,并提取其沉降区边缘的高相干点,结合少量沉降中心水准点,利用改进型PSO(Particle Swarm Optimization)算法获取PIM参数,并通过克里金插值法建立采空区地表整体沉降区模型,利用少量水准点数据对该方法的可靠性和精度进行验证,结果表明,该方法获得的沉降区分布与实际相吻合,其沉降区监测精度比单独使用时序InSAR或PIM的更高,可用于矿区地表沉降信息的准确获取。

一种新的提高反舰导弹捕捉概率方法研究

利用星载微波散射计测量海面风场技术可以提高反舰导弹的射击精度。文章分析了海面风场对反舰导弹射击精度的影响 ,由于现有修风方法已经不能满足要求 ,提出了一种解决办法 ,即利用星载散射计测量海面风场 ,并将这些信息应用到超视距导弹射击中 ,可以提高反舰导弹捕捉概率 ,从而提高导弹命中概率。

^(87)Kr γ射线发射几率的重新测定

在以往87Kr的测量实验中,壁效应校正和HPGe探测器效率刻度结果不确定度均较大。本工作针对存在的问题,改进了实验装置,准确进行了壁效应校正,用长度补偿法测得了放射性活度浓度为100.87(1±0.86%)Bq/mL;重新设计加工了能准确标定HPGe探测器效率的源盒,测得87Kr402.6keVγ射线的发射几率为49.46%(1±1.9%)。

环形严格n中取连续K系统的失效概率

本文给出了环形严格ｎ中取连续Ｋ系统在部件独立不同分布条件下的失效概率公式，并证明了对于环形系统，部件齐次马尔科夫相依条件与独立同分布的等价性．

Improved Genetic Algorithm and Its Performance Analysis

Although ge ne tic algorithm has become very famous with its global searching, parallel computi ng, better robustness, and not needing differential information during evolution .However, it also has some demerits, such as slow convergence speed. In this pap er, based on several general theorems, an improved genetic algorithm using varia nt chromosome length and probability of crossover and mutation is proposed, and its main idea is as follows:at the beginning of evolution, our solution with sho rter length chromosome and higher probability of crossover and mutation; and at the vicinity of global optimum, with longer length chromosome and lower probabil ity of crossover and mutation. Finally, testing with some critical functions sho ws that our solution can improve the convergence speed of genetic algorithm sign ificantly, its comprehensive performance is better than that of the genetic algo rithm which only reserves the best individual.

Does Beta Thalassemia Increase the Incidence of Bell＇s Palsy？

A five-year old Iraqi patient with beta thalassemia major was presented with recurrent attack of Bell＇s palsy on 2 successive years being a milder one in the second year. This is a rare occurrence in beta thalassemia major patients and needs to be further explored. This is a case report of a nine-year old Iraqi child who is the only child born to parents of secondary consanguinity relatives from Babil Province who was diagnosed as beta thalassemia on the age of 6 months and is on regular blood transfusion and iron chelation therapy of deferasirox tablets （Exjade）, his medical follow up takes place at Babil Thalassemia center in Babil Maternity and Child Hospital. On the age of five years, he was presented with a sudden onset of right sided Bell＇s palsy within twenty four hours of swimming in a cool swimming pool at his home in July 2011. A neurosurgeon examined him at that time, no investigations were done, the diagnosis was purely clinical, steroid ＆ neurotonics were recommended as a treatment for the condition, antiviral agents were not prescribed, lacrimation ＆ taste were not affected, there was a slow improvement, two weeks later physiotherapy sessions including facial massage ad electric stimulation were recommended after which the child improved. The next year, another attach of Bell＇s Palsy developed at a similar time with the same sequel of events, this time the attack was milder and with residual effects seen in the eye ＆ mouth. This coincidence of beta thalassemia and Bell＇s palsy should be further studied by observational epidemiologic studies to prove or disprove the hypothesis that thalassemic patients especially children are at higher risk of developing Bell＇s palsy than healthy children. Beta thalassemia patients may be at higher risk of developing Bell＇s Palsy.

素数定理的拓展

设任一偶数２ｎ，是否存在着一个仅依赖于２ｎ的函数ｆ（２ｎ）？它能表示偶数表为两个素数之和的素数解的组数。本文首先把素数定理引入奇数列（一维空间），然后拓展到二维空间。在一维空间，素数定理－素数的分布函数π（ｘ）～ｘｌｏｇｘ（ｘ∞），从素数定理得到：Ｐ（Ｎ）～１ｌｏｇｘ及Ｐ（Ｇ）～２ｌｏｇｘ。Ｐ（Ｇ）作为数据处理的工具，用它解决了命题Ｐ２ｎ（１，１）。在二维空间：素数的联合分布密度Ｐ（Ｐｘ，Ｐｙ）～１ｌｏｇｘｌｏｇｙ，由它积分得到了分布函数π（ｘ，ｙ），利用π（ｘ，ｙ）可以估计圆内素点（Ｐｘ，Ｐｙ）的个数，并且解决了命题，Ｐ２ｎ（１，１）２。Ｐ２ｎ（１，１）和Ｐ２ｎ（１，１）２的结果是用不同的方法建立的不同的数学模型，但是它们主阶的数值规律是一致的。这个问题本文得到解决。

基于贝叶斯网络的航班离港时间动态估计

为了准确地感知航班离港流程和估计航班离港的时间,设计了一种基于动态贝叶斯网络的航班离港时间估计方法。首先,基于航班的不同属性分析影响航班离港流程的因素,根据影响因素对数据进行分类处理,在历史数据分类的基础上,结合蒙特卡洛模拟方法获取各环节的联合分布和先验分布,并由柯尔莫哥洛夫检验确定各环节的联合分布模型,从而获得动态贝叶斯网络模型的参数;其次,根据贝叶斯网络架构和条件概率推理动态估计离港时间及各环节的完成时间;最后,选取国内中部某机场的单航班离港运行数据进行仿真验证。研究结果表明:随着流程的推进,其传播误差会增大,但离港时间的估计精度达到了80%以上,动态估计结果的稳定性较好,能够充分地反映航班离港流程中各关键节点的实际情况。

新疆降水概率预报技术研究

采用相似预报方法以相似离度为相似判据,使用T213资料,从1980～1999年共20年的NCAR再分析格点数据中,经四次相似过滤,选取相似样本,建立预报方程,制作全疆59个测站0～12、12～24h小量、中量以上降水概率预报,预报概率值大小分为12级0、5、10、20、30、40、50、60、70、80、90、100%。