QRS波群检测中的二次B样条小波变换算法

针对目前心电信号检测中准确度不高以及适应性不强的问题,提出了一种基于二次B样条小波,结合二分搜索算法和圆弧逼近曲线算法的QRS波群检测算法。首先对心电信号用二次B样条小波经Mallat算法分解,在二分搜索法调整阈值和模极大值检测R波的基础上,再用基于最小二乘圆弧逼近曲线算法检测T波与P波。最后用MIT-BIH数据库的数据验证了该改进算法增强了R波检测的适应能力,提高了T波与P波的检测准确度。仿真实验表明该改进算法可以有效地提高心电信号自动检测能力。     

广义Nizhnik-Novikov-Veselov方程组的新行波解

借助齐次平衡方法和数学软件计算,应用修正的G＇/G展开法成功获得了Nizhnik-Novikov-Veselov（简称NNV）系统的多个含有参数的精确行波解,所得的解包含有新的孤立波解,丰富了已有结果.该方法具有简单高效、计算量小、求解速度快等特点,此方法还可以用来求解其它的高维非线性发展方程的精确行波解和孤立波解.     

变频器谐波产生的原因与抑制措施

变频器谐波是变频器运行过程中,在输入输出回路产生的高次谐波。首先阐述了变频器谐波产生机理;其次,分析了变频器谐波产生干扰的传播途径;同时,对变频器谐波对电力设备或电力系统的主要危害进行了深入的探讨。最后,结合实际应用和调试经验,介绍了一些抑制干扰的有效措施。     

泛函积分与玻色费米子模型中的长波激发

本文采用泛函积分方法研究了高温超导中玻色-费米子模型的长波激发.推导了能隙方程和激发谱方程,并且计算了在长波近似下费米场的玻色能谱,得到了简并和非简并激发模.     

基于地面参数预测的电波折射修正软件设计

受大气折射效应的影响,电波传播路径发生弯曲,传播速度小于光速,给无线电定位系统带来了一定的误差,因此需利用电波折射误差计算软件进行修正.首先通过对常用大气折射误差修正方法的分析,结合实际应用需求,选取了基于地面参数预测的电波折射修正模型.然后进行折射软件修正算法设计,给出了流程图及主要功能实现方法.最后通过模拟数据对该软件修正效果进行检验.结果表明,该软件能够准确、快速显示大气引起的电波折射误差,且能够将误差控制在1%以内.     

Simulation of mode conversion at the magnetopause

Two-dimensional(2-D)and three-dimensional(3-D)hybrid simulations are carried out for mode conversion from fast mode compressional wave to kinetic Alfvn waves(KAWs)at the inhomogeneous magnetopause boundary.For cases in which the incident fast wave propagates in the xz plane,with the magnetopause normal along x and the background magnetic field pointing along z,the 2-D (xz)simulation shows that KAWs with large wave number kxρi～1 are generated near the Alfve′n resonance surface,whereρi is the ion Larmor radius.Several nonlinear wave properties are manifest in the mode conversion process.Harmonics of the driver frequency are generated.As a result of nonlinear wave interaction,the mode conversion region and its spectral width are broadened.In the 3-D simulation,after this first stage of the mode conversion to KAWs with large kx,a subsequent generation of KAW modes of finite ky is observed in the later stage,through a nonlinear parametric decay process.Since the nonlinear cascade to ky can lead to massive transport at the magnetopause,the simulation results provide an effective transport mechanism at the plasma boundaries in space as well as laboratory plasmas.     

Observations of kinetic Alfvén waves by THEMIS near a substorm onset

Low frequency electromagnetic fluctuations in the vicinity of a magnetospheric substorm onset were investigated using simultaneous observations by THEMIS multiple probes in the near-Earth plasma sheet in the magnetotail.The observations indicate that in the vicinity of a substorm onset,kinetic Alfvén waves can be excited in the high-βplasma sheet(β=2μ0nT/B 2 ,the ratio of plasma thermal pressure to magnetic pressure)within the near-Earth magnetotail.The kinetic Alfvén wave has a small spatial scale in the high-βplasma.The parallel electric field accompanying kinetic Alfvén waves accelerates the charged particles along the magnetic field.The kinetic Alfvén waves play an important role in the substorm trigger process,and possibly in the formation of a substorm current wedge.     

1420冷轧轧机轧辊的加热改进

分析比较了国内某1420冷轧酸洗一轧机联合机组生产产品质量,针对换辊时温差导致轧制的薄板变形量大,对联合机组进行了改进,改进后末架配备了轧辊预热装置,产品质量明显提高。     

建筑形式的理性推演——记河南出版产业基地方案的形式生成

记述河南出版产业基地建筑形式的推演过程.首先对整体构图形式进行了多种可能性分析,探讨建筑群体与地块平面的图底关系,然后确立功能分区和内部空间组织框架,使建筑形成围合和半围合的空间院落,树木与水渠等景观系统也随之生成.从建筑形式的缘起与生成和空间的特别营造两方面探讨了形式的理性分析与生成.     

任意域上矩阵的Jordan标准型

文章根据线性变换的相似性与矩阵相似性之间的等价关系,利用一般算子和位移算子Sq是相似的这个特别的方法,推导出了线性代数中复矩阵的Jordan标准型的存在性,并推广到了任意域F上的矩阵的广义的Jordan标准型.