Conformal invariance and a kind of Hojman conserved quantity of the Nambu system

Conformal invariance and a kind of Hojman conserved quantity of the Nambu system under infinitesimal transfor-mations are studied.The definition and the determining equation of conformal invariance of the system are presented.The necessary and sufficient condition under which the conformal invariance of the system would have Lie symmetry un-der infinitesimal transformations is derived.Then,the condition of existence and a kind of Hojman conserved quantity are obtained.Finally,an example is given to illustrate the application of the results.     

Perturbation to Mei symmetry and Mei adiabatic invariants for discrete generalized Birkhoffian system

Based on the concept of discrete adiabatic invariant,this paper studies the perturbation to Mei symmetry and Mei adiabatic invariants of the discrete generalized Birkhoffian system.The discrete Mei exact invariant induced from the Mei symmetry of the system without perturbation is given.The criterion of the perturbation to Mei symmetry is established and the discrete Mei adiabatic invariant induced from the perturbation to Mei symmetry is obtained.Meanwhile,an example is discussed to illustrate the application of the results.     

分数阶非线性系统PDα型迭代学习控制收敛性分析

针对一类单输入单输出的分数阶非线性连续系统,利用卷积的推广Young不等式,分别研究了开环、闭环以及开闭环PD^α型分数阶迭代学习控制算法在L^p范数意义下收敛的充分条件,并进行了严格的理论证明.研究发现:控制算法收敛的充分条件取决于算法的增益和系统自身属性;在控制算法选取适当增益的情况下,开闭环PD^α型控制算法拥有比开环算法更快的收敛速度.这些结论与分数阶线性系统是相同的.仿真实验进一步验证了上述理论的可行性和正确性.     

铟掺杂的竹节型钛酸盐纳米线的制备与表征

自日本科学家Iijima[1]于1991年发现碳纳米管以来,一维纳米结构的纳米棒、纳米线以及纳米管等由于在科学研究和工业应用方面的重要作用已引起了人们的广泛关注[2].     

1:1万建库与制图数据一体化生产

文章以甘肃省地图院1∶1万基础数据生产为例,主要阐述了航测法成图制作1∶1万入库与制图数据工作过程中,采用GeowayDPS采编一体化数字摄影测量软件对地物进行室内判调"先内后外"的作业方法.进行入库数据与制图数据一体化生产,从而实现"一套数据两种用途".同时,建立完善、有效的生产模式和采用成熟的数据生产软件是保证数据质量的关键.     

Perturbation to Noether Symmetry and Noether Adiabatic Invariants of General Discrete Holonomic Systems

The perturbation to Noether symmetry and Noether adiabatic invariants of general discrete holonomic systems are studied. First, the discrete Noether exact invariant induced directly from the Noether symmetry of the system without perturbation is given. Secondly, the concept of discrete high-order adiabatic invariant is presented, the criterion of the perturbation to Noether symmetry is established, and the discrete Noether adiabatic invariant induced directly from the perturbation to Noether symmetry is obtained. Lastly, an example is discussed to illustrate the application of the results.     

中国现代文学中的精神病患者形象及其价值

从鲁迅的《狂人日记》开始,中国现代小说中形成了一个“疯癫谱系“,他们在现代文学当中分别执行着刻度尺功能、批判功能、控诉功能等现代文学职能,同时他们无论是在时间、空间观念上,还是在心理世界上,都有着从内部的罪恶感到外部的病态的展示过程,从而也实现了现代人的精神转型。     

锂离子电池MnO/TiN负极研究

以乙酸锰和钛酸四丁酯为原料,柠檬酸为络合剂,采用溶胶-凝胶法制备钛酸锰（MnTiO3）粉体,而后将其粉体高温氨气氮化,可得到MnO/TiN复合材料. 使用X射线衍射（XRD）、X射线能量色散谱（EDS）和场发射扫描电子显微镜（FESEM）表征材料的物相结构与组分、观察其形貌. 采用循环伏安、恒流充放电和电化学阻抗方法测试电极电化学性能. 结果表明,MnO/TiN电极在100 mA?g-1和1 A?g-1倍率放电下,比容量分别为394 mAh?g-1和146 mAh?g-1,均高于单纯MnO电极比容量和倍率性能,这归因于复合材料中的TiN提供了导电网络,并有效地抑制了电极在充放电过程中的体积膨胀效应.     

分数阶线性系统初值学习的PDα型迭代学习控制

针对分数阶线性时不变系统的随机初值问题,提出了基于初值学习的PDα型分数阶迭代学习控制算法,利用λ-范数,对控制算法的收敛条件进行了严格证明,并利用仿真实验进行验证.理论分析和仿真实验表明,系统初值不论如何取值,在该算法作用下,随着迭代次数的增加,都能实现系统输出对期望输出的精确跟踪.相比传统的PDα型控制算法,该算法解决了传统控制算法要求系统初值与期望初值相同的限制,消除了随机初值对系统的影响.