INTERFACIAL TEMPERATURE RISE AND MULTIPLICITY IN NONISOTHERMAL GAS-LIQUID CSTRs

For exothermic gas-liquid reactions.the interfacial temperature affects the gas-solubility, interfacial reaction rate, mass transfer rate and the bulk temperature of the reactor. An overall heat balance on the reaction-diffusion 'film' relates the interfacial temperature to the bulk variables (temperature, concentration), and the interfacial variables (enhancement factor, etc.). While the interfacial balance shows (apparent) multiplicity of interfacial temperature for a given bulk temperature, uniqueness results when the interfacial balances are solved together with the mass and energy balances for the reactor bulk. It is shown that the state of interface and bulk are intimately related, and thus, consideration of interfacial temperature does not increase the multiplicty of a gas-liquid CSTR. Simple a priori estimates are derived for the interfacial temperature. All of the results are found to be rather independent of kinetic details. The interfacial temperature rise is encouraged by low interfacial heat and mass transfer coefficients, by small liquid residence time in the bulk and by increased heat losses from the reactor bulk.     

复杂山地宽线观测系统叠加效果分析

如何提高复杂山地地震资料信噪比和成像的精度是复杂山地地震资料采集面临的一个主要难题。以南方某山地宽线地震采集资料为例,对宽线地震采集资料进行了处理效果分析,采用了观测系统退化的对比分析方法,对比了不同覆盖次数的宽线剖面处理效果。采用定量分析的方法,确定覆盖次数与信噪比之间的关系,提出某南方复杂山地覆盖次数应在540次左右的建议,为以后的同类地区进行宽线采集提供参考。     

多层Agent数据融合的无线传感器决策网络及其多样性研究

为实现无线传感器网络（WSN）原始感知数据融合中不确定分析的量化决策和智能处理,在 WSN层次化的数据融合机制下,引入粗糙集理论的决策表和决策网络智能技术,设计智能型和规则型2类 Agent,由此构建多层 Agent数据融合的无线传感器决策网络（WSDN）模型,并研究层间智能 Agent型和属性间规则 Agent型 WSDN的多样性。应用结果表明,该模型能较好地适用于典型的 WSN场合,实现 Agent间的融合优化与智能决策。     

The multiple-parameter fractional Fourier transform

The fractional Fourier transform （FRFT） has multiplicity, which is intrinsic in fractional operator. A new source for the multiplicity of the weight-type fractional Fourier transform （WFRFT） is proposed, which can generalize the weight coefficients of WFRFT to contain two vector parameters m,n ∈ Z^M . Therefore a generalized fractional Fourier transform can be defined, which is denoted by the multiple-parameter fractional Fourier transform （MPFRFT）. It enlarges the multiplicity of the FRFT, which not only includes the conventional FRFT and general multi-fractional Fourier transform as special cases, but also introduces new fractional Fourier transforms. It provides a unified framework for the FRFT, and the method is also available for fractionalizing other linear operators. In addition, numerical simulations of the MPFRFT on the Hermite-Gaussian and rectangular functions have been performed as a simple application of MPFRFT to signal processing.     

Mg-Ti复合脱氧对低碳微合金钢组织性能的影响

通过焊接热模拟和冲击韧性试验,研究了Mg-Ti脱氧和Al脱氧在大线能量焊接热循环条件下对低碳微合金钢粗晶区组织性能的影响。结果表明,Mg-Ti脱氧钢粗晶区的组织主要是针状铁素体（AF）和少量的多边形铁素体,Al脱氧钢粗晶区的组织主要是低碳贝氏体＋大量的块状铁素体。对Mg-Ti脱氧钢和Al脱氧钢在不同焊接热循环下的冲击韧性进行研究,结果表明随着焊接热输入量的增大,两种脱氧钢的冲击韧性都有所下降,但是从总体上来说Mg-Ti脱氧钢粗晶区的冲击韧性远远高出Al脱氧钢粗晶区的冲击韧性。     

一类可修复串联系统主算子的谱特征分析

运用泛函分析中共轭空间的相关定理和理论以及算子半群中的相关理论,研究了一类可修复串联系统主算子A＋E所对应的特征向量的几何重数、代数重数的特征,进而描述了一类可修复串联系统主算子A＋E的谱特征．     

An application of Routh stability criterion to derive the necessary conditions for multiplicity of a CSTR

It is well known that the Routh stability criterion (RSC) is a powerful method for analyzing control system stability. A new RSC finding that can aid the tangent analysis method (TAM) to determine the necessary conditions for multiplicity is presented. Adding RSC to TAM can find the bifurcation start point which cannot be obtained using TAM alone. To the author's knowledge, the above new RSC application has not been discussed in past literatures. Our results are helpful for chemical reactor design. We used two examples of the binary reaction in a non‐adiabatic CSTR to demonstrate the merit of our methods.     

铀材料的中子多重性测量分析方法

多重性测量是一种可以显著提高测量精度、降低测量偏倚的新方法.本文分析了主动法符合测量偏倚较大的原因,介绍了主动法多重性测量的理论关系式,阐述了由测量数据先确定样品增殖,再由经验关系式得到反应系数,进而得到样品质量的数据处理方法.     

基于逆变器多重化的串联混合型有源滤波器的仿真研究

针对串联混合型有源滤波器的特点,提出了用电流型逆变器多重化技术来减小输出电流谐波,从而等效地增大了串联有源滤波器的谐波阻抗,进一步隔离了谐波源在电源与负载间的互串.该方案有效地减少了电源电流谐波畸变率,仿真结果验证了方案的可行性.     

关于切触有理插值问题的一种分段方法

将插值节点进行分段,利用分段Hermite插值多项式及相应的多项式,采用线性组合方法得到一般切触有理插值函数的表达式,还可方便地给出无极点的切触有理插值函数的构造方法。通过引入参数方法,给出设定次数类型的切触有理插值问题有解的条件,证明了解的存在唯一性,并给出误差估计公式。实例表明所给方法具有直观、灵活和有效性,便于实际应用。