基于投影寻踪学习网络模型的光纤陀螺漂移估计器设计

环境温度变化造成的复杂漂移（温度漂移）始终是制约光纤陀螺（FOG）性能提高的重要因素。FOG温度漂移本质上是一组与温度有关的多变量非线性时间序列，在这一领域首次采用投影寻踪学习网络（PPLN）方法设计FOG温度漂移在线估计器，相对于传统的神经网络技术，PPLN采用批量学习和参数变替优化的训练算法，可以自适应确定神经网络的规模、参数和神经元函数，不仅具有简捷的网络结构和较强的鲁棒性和模型辨识能力，还可以有效克服学习过程局部极限问题。基于该方法设计PPLN漂移估计器对某型FOG温度漂移进行估计。采用试验实测数据对所提方法进行验证，并采用传统反向传播神经网络（BPNN）的方法进行比较，计算分析结果表明，PPLN漂移估计器具有更好的估计精度和鲁棒性，尤其在陀螺温度不正常变化时对当前漂移的估计精度可以提高至少2倍。     

玉米套种的栽培技术要点

简要介绍了玉米套种甘蓝复播架豆角的栽培技术及其收益。     

Removal of disinfection by-product formation potentials by biologically assisted GAC treatment

The object of this paper is to evaluate the removal of disinfection by-products formation potential by artificially intensified biological activated carbon（BAC） process which is developed on the basis of traditional ozone granular activated carbon （GAC）. The results show that 23.1% of trihalomethane formation potential （THMFP） and 68% of haloacetic acid formation potential （HAAFP） can be removed by BAC, respectively. Under the same conditions, the removal rates of the same substances were 12.2% and 13-25% respectively only by GAC process. Compared with GAC, the high removal rates of the two formed potential substances were due to the increasing of bioactivity of the media and the synergistic capabilities of biological degradation cooperating with activated carbon adsorption of organic compounds. BAC process has some advantages such as long backwashing cycle time, low backwashing intensity and prolonged activated carbon lifetime, etc.     

Effects of medium nutrition on cell growth and isocamptothecin A and B production by suspension cell culture of Camptotheca acuminata

The effects of initial sucrose concentration, nitrate to ammonium ratio, total N concentration and phosphate concentration in medium on cell growth and isocamptothecin A and B synthesis by suspension call culture of Camptotheca acuminata were investigated in 250 mL shake flasks. 30 g L^-1 sucrose concentration was beneficial to secondary metabolites synthesis. The cell growth and metabolites synthesis were also affected by the ratio of NO3^-/NH4^＋ , and nitrate was tavourable for cell growth. The maximum dry weight was achieved when nitrate was used as the sole N souree. The effect of total initial N on the cell cultures was also investigated with NO3^-/NH4^＋ ratio of 1 ： 2. The final dry cell weight was similar throughout culture period and 50 mM initial N was favourable for secondary metabolite synthesis. 50 mM initial phosphate concentration facilitated both cell growth and secondary metabolites synthesis.     

中承式钢筋混凝土拱桥自振特性分析

在分析中承式钢筋混凝土拱桥自振特性的基础上,考虑了各种结构参数(矢跨比、横撑的布置、桥面刚度和拱肋刚度、支撑条件等)对中承式钢筋混凝土拱桥的自振特性的影响,建立了拱桥的有限元空间计算模型,并将其应用于该类某市政桥的自振特性的计算,为该类桥的设计和检测提供参考.     

游离脂肪酸对模型胆汁相平衡的影响

0 引言 随着饮食结构的改变,胆结石的发病率也不断增加,其中大多数为胆固醇结石.胆结石及其引发的胆绞痛、急性胆囊炎、胰腺炎以及其它胆道并发症严重地危害着人民群众的健康,因此,对胆固醇结石成因的研究和防治具有十分重要的意义.     

区间数互补判断矩阵中元素的运算与排序算法

分析区间数互补判断矩阵中已有的元素运算法则,重新定义区间数互补判断矩阵中一些元素的运算,给出将区间数互补矩阵转换为一致性矩阵的定理,并利用互反和互补之间的转换,得到一个区间数互补判断矩阵的排序算法.     

钢-混凝土组合梁附加挠度的能量法分析

钢梁与混凝土之间的相对滑移使钢-混凝土组合梁刚度降低,变形增大。文章从能量的角度,提出滑移效应下剪力连接件应变能公式;建立了钢-混凝土组合梁应变性能分析的微分方程;并对集中荷载下简支梁的挠曲线进行了实例求解;与换算截面法和有限元分析结果比较,验证了通过能量法求解滑移效应下组合梁挠度的可行性。     

数学物理反问题不适定性理论研究

本文对当前的热门问题反问题,从数学角度给出它的算子形式,讨论了反问题的求解难点不适定性理论,并在Tikhonov正则化方法下给出了数值算例。     

数学中特殊高次方程的解法研究

基于五次或五次以上方程没有一般通用的求根公式,本文列举了一些特殊的高次方程的解法。最后阐述了方程的发展历程对代数领域的贡献。