用等效网络法求屏蔽微带线的特性阻抗

本文在用等效网络法分析屏蔽微带的有效介电常数及其色散特性基础上,根据屏蔽微带线中的场结构和导带表面电流分布,推导出屏蔽微带线的特性阻抗公式。文中进行了数值计算,得到了合理的结果。     

相互作用体系的随机临界地震响应分析

运用等效线性化方法分析了地基土－非线性单自由度结构相互作用体系的随机临界地震激励和随机临界地震响应，并针对一个单自由度水塔结构进行了具体的数值计算，选择方差相同的过滤白噪声随机地震动作为输入，计算了该体系的随机地震响应，并验证了随机临界地震响应分析法的实用性．     

An equivalent 1D nanochannel model to describe ion transport in multilayered graphene membranes

Multilayered graphene-based membranes are promising for a variety of applications related to ion or molecule transport, such as energy storage and water treatment. However, the complex three-dimensional cascading nanoslit-like structure embedded in the membrane makes it difficult to interpret and rationalize experimental results, quantitatively compare with the traditional membrane systems, and quantitatively design new membrane structures. In this paper, systematic numerical simulations were performed to establish an equivalent onedimensional(1 D) nanochannel model to represent the structure of multilayered graphene membranes. We have established a quantitative relationship between effective diffusion length Leffand cross-section area Aeffof the1 D model and our recently developed two dimensional(2 D) representative microstructure for graphene membranes. We find that only in the cases of a relatively large lateral size L( ~100 nm) and a small slit size h( 2 nm), the effective diffusion length Leffand Aeffcan be calculated by an over-simplified but often used model. Otherwise, they show complex dependence on all three structural parameters of the 2 D structural model.Our equivalent 1 D nano-channel model can reproduce experimental results very well except for h 0.5 nm. The discrepancy could be attributed to the anomalous behaviour of molecules under nano-confinement that is not considered in our simulations. This model can also be extended to multilayered membranes assembled by other2 D materials.     

对“置换法测定金属的当量”实验的改进

本文从原理上对该实验进行了部分改进,用“原子量”取代了“当量”,并建议将实验题目改为“置换法测定金属的原子量”。克服了实验教学中的疑难问题,有利于更好地达到实验目的。     

等势凝聚集

本文给出等势凝聚集的概念，得到了有别于导集的若干结果，由此产生了几个新概念，并讨论了它们的基本性质。     

凸函数与Jensen不等式

不等式是研究分析数学的重要工具,很多常见不等式又是与函数的凸性分不开的.文章先给出了凸函数的定义,利用其等价条件证明了Jensen不等式,并介绍了其应用.     

T型互感网络的等效电路及其在电路综合中的应用

本文推导了Ｔ型互感网络的等效电路，使得含有Ｔ型互感的电路可一次去耦，这对工程计算以及网络综合都将起到积极作用。     

Implementation of Time-Scale Transformation Based on Continuous Wavelet Theory

1.INTRODUCTIOnThebasicobjectiveoftime-scaletransformationistocompressorexpandthesignalintimefieldwhilekeepingthesamemagnitudeproperties.Byagivensquare-integrablefunctionf(t)thatisdependentontime,thispaperconstructsanexpectedfunctiong(t)~f(i/A)(^>0)throughcontinuouswavelettransformandinversetransform.Thetime--scaletransformationofsignalorfunctioncanprovidemailyillterestingapplications.FOrinstance,oneapplicationisforthephonocardiagramprocessingbyexpandingtime-scaletransformtorecognizeanopen…     

等距共轭曲面原理在精确切齿计算中的应用

本文阐述了在小轮的精确切齿计算中 ,运用等距共轭曲面原理 ,在无滚切修正机构的机床中 ,准确地得出机床调整参数 ,并在切齿中获得了良好的结果     

谷物喂入量台架当量测试与分析

对联合收割机随机喂入量实时测试技术进行了理论探讨，通过台架试验研究提出了当量喂入量测试方法的设想，并对其实际应用进行了有益的分析和研究