System Stability and Instability： A Extended Discussion on Significance and Function of Stirring Energy Conservation Law

1Introduction Sincethemiddleofthelastcentury,thesystemscience takingthesystemasafoundationhasbeendeveloped vigorouslyasascientificsubject,andstatisticmethodshave beenintroducedtosolvesomeso called“complexproblems”withsuccess,leadingtofoundationofsystemscience.The coreideaoftheconceptsystemistoemphasizeanoverall viewofnon particle.Atpresent,thegenerallyacceptedway offormulationofsystemscienceistoregardasystemasa whole,butisnotlimitedtoasimplemixofdifferent componentsofthesystem.Substantively,…     

Principle Question of Harmonic Quantitative Analysis of Spectrum Expansion

The numerical analysis was made in terms of questions that quantity is stable or unstable. The results show that the stability due to “infinitesimal difference of they are well-matched in large quantity” or “Chaos” leads to numerical calculation meaningless. The quantity instability due to magnitude explosive increasing does not follow the suitability. Both unstable magnitude be restricted by the suitability and the numerical calculating by “ill-posed equation” of “infinitesimal difference of they are well-matched ill large quantity” might fall into producing false information.     

亚纯函数的唯一性及其推广

讨论了亚纯函数的唯一性问题，推广了谢晖春及仪洪勋的有关定理．     

温度对污泥流化床焚烧飞灰重金属迁移的影响

通过在城市污泥流化床焚烧炉炉膛出口及对流受热面处进行高温飞灰在线取样,以及对布袋除尘器飞灰在水平管式炉上进行不同温度下的煅烧试验,研究温度对焚烧飞灰中Cr,Mn,Ni,Cu,Zn,As,Cd和Pb8种重金属迁移富集特性的影响.试验结果表明,飞灰的主要化学成分为Si O2,Fe2O3,Ca O,Al2O3和P2O5.在流化床焚烧温度范围内,Mn,Cu,Cr,Ni和Zn没有经历挥发-冷凝,主要通过夹带富集于飞灰颗粒,它们在尾部烟道不同温度区域飞灰颗粒上的富集程度相当;在炉膛内挥发的Cd,As及其化合物在500~700℃和500~800℃之间大量富集于飞灰颗粒.Pb在焚烧炉内因生成氧化铅和铅酸盐等比较稳定的化合物而少量挥发.Zn的化合物与飞灰基体中的化合物发生反应,生成硅酸锌和铝酸锌等稳定的化合物,在一定程度上阻止Zn的挥发.     

“Twits-Up”,Transform of Spin Flows and Physics of Process

1 Introduction Due to theoretical difficulties and technologicalobstacles, very few people have been braveenoughtoforecast disastroustorrential rains of 100mmor higher . Because of our success withthesekinds of disastrous weather systems , manyscholars and front-line meteorologists have askedus questions like : Without first going intotheoretical details ,what is the difference betweenyour method and the traditional ,but well appliedmethod? To this end,our answer is our methodmakes use of some…     

职业资格认证进入高校教育的探讨

实行学历证书和国家职业资格证书“双证”制度,可以培养出理论水平较高、实践动手能力较强,能从事工程技术研究和开发的复合型人才,可以促进教育与市场需求相接轨,对大学生的择业和今后相关工作创造了非常有利的条件。     

乘法器式功率变换器

本文介绍了以模拟乘法器为核心器件组成的功率变换电路的基本线路、工作原理、调整方法和实验数据.对模拟乘法器的运算机理进行了理论和数学分析.文章阐述了线性误差及非线性误差,提出了对输出失调误差、u_X(或u_Y)线性馈通误差、增益误差等的调整和补偿方法.本文还对三相功率变换器的工作原理、原理框图以及检测数据进行了分析.     

正实零点整函数的广义增长指标的一性质

本文证明了,一个整函数与由该函数的非零零点构成的典型乘积具有相同的广义增长指标,给出了具有正实零点的非整数级函数,当其零点对于任意邻近级上密度存在时,其广义增长指标与其零点之上密度的关系。     

具有三个公共值的亚纯函数的唯一性

讨论了具有三个公共值的亚纯函数的唯一性，推广了Ｏｚａｗａ，Ｕｅｄａ及仪洪勋的有关定理。     

幅度-脉宽调制式功率变换电路及其显示系统

本文提出了幅度-脉宽调制原理的功率变换电路.锯齿波信号u_s加到比较器的反相输入端;与被测负载电流瞬时值成比例的信号u_i加到比较器的同相输入端.两信号在运放内进行调制,使其输出脉冲的吝个间隔分别决定于被测电流各瞬时值的大小.此输出脉冲加到积分-断流单元晶体开关管的基极.晶体开关管的集电极与发射极间的电压取决于电网电压.这样,积分-断流单元输出直流信号的平均值就与被测电路的功率成正比.文中对此种功率变换电路的误差进行了理论分析和数学推导. 文章还扼要介绍了双积分型A/D转换器及LED显示系统.