Perturbation Methods with Applications in Science and Engineering最新文献

Mechanical Perturbations at the Working Electrode to Materials Synthesis by Electrodeposition 工作电极上的机械扰动对电沉积合成材料的影响

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.78544

Baudel Lara Lara, Arturo Fernández Madrigal, Lizbeth Morales Salas, A. Gutiérrez

{"title":"Mechanical Perturbations at the Working Electrode to Materials Synthesis by Electrodeposition","authors":"Baudel Lara Lara, Arturo Fernández Madrigal, Lizbeth Morales Salas, A. Gutiérrez","doi":"10.5772/INTECHOPEN.78544","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.78544","url":null,"abstract":"Applying mechanical perturbations at the working electrode during the electrodeposi- tion process is a novel strategy for materials synthesis that has been used for Cu(In,Ga) Se 2 (CIGS) thin film synthesis. A mechanical perturbations strategy was applied during one-step electrodeposition, and the results are compared with the traditional one-step electrodeposition where no mechanical perturbations were applied. In both cases, a potentiostatic mode was employed, where DC potential is applied to the working electrode with respect to the reference electrode; the potential is regulated by the current at an auxiliary electrode. The CIGS films obtained from both strategies were analyzed as electrodeposited and after being annealed in a selenium atmosphere. The annealed film morphology obtained with the potentiostatic mode plus periodical mechanical perturbations was denser and more compact than the film without mechanical perturbations. Using contour lines, the morphology evolution and mass transport distribution on the working electrode during the electrodeposition process are explained.","PeriodicalId":114469,"journal":{"name":"Perturbation Methods with Applications in Science and Engineering","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128120702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Perturbation Method for Solar/Infrared Radiative Transfer in a Scattering Medium with Vertical Inhomogeneity in Internal Optical Properties 内部光学性质垂直不均匀散射介质中太阳/红外辐射传递的摄动方法

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77147

Yining Shi, Feng Zhang, Jia-Ren Yan, Q. Yu, Jiangnan Li

引用次数: 0

Sliding-Mode Perturbation Observer-Based Sliding-Mode Control for VSC-HVDC Systems 基于滑模摄动观测器的VSC-HVDC滑模控制

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.74717

Bo Yang, Tao Yu, H. Shu, Pulin Cao

{"title":"Sliding-Mode Perturbation Observer-Based Sliding-Mode Control for VSC-HVDC Systems","authors":"Bo Yang, Tao Yu, H. Shu, Pulin Cao","doi":"10.5772/INTECHOPEN.74717","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.74717","url":null,"abstract":"This chapter develops a sliding-mode perturbation observer-based sliding-mode control (POSMC) scheme for voltage source converter-based high voltage direct current (VSC-HVDC) systems. The combinatorial effect of nonlinearities, parameter uncertainties, unmodeled dynamics, and time-varying external disturbances is aggregated into a perturbation, which is estimated online by a sliding-mode state and perturbation observer (SMSPO). POSMC does not require an accurate VSC-HVDC system model and only the reactive power and DC voltage at the rectifier side while reactive and active powers at the inverter side need to be measured. Additionally, a considerable robustness can be provided through the real-time compensation of the perturbation, in which the upper bound of perturbation is replaced by the real-time estimation of the perturbation, such that the over-conservativeness of conventional sliding-mode control (SMC) can be effectively reduced. Four case studies are carried out on the VSC-HVDC system, such as active and reactive power tracking, AC bus fault, system parameter uncertainties, and weak AC gird connection. Simulation results verify its advantages over vector control and feedback linearization sliding-mode control. Then, a dSPACE-based hardware-in-the-loop (HIL) test is undertaken to validate the implementation feasibility of the proposed approach.","PeriodicalId":114469,"journal":{"name":"Perturbation Methods with Applications in Science and Engineering","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121074627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

On Optimal and Simultaneous Stochastic Perturbations with Application to Estimation of High-Dimensional Matrix and Data Assimilation in High-Dimensional Systems 最优同步随机扰动及其在高维矩阵估计和高维系统数据同化中的应用

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.77273

H. S. Hoang, R. Baraille

引用次数: 0

Density Functional Perturbation Theory to Predict Piezoelectric Properties 密度泛函微扰理论预测压电特性

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.76827

Kaoru Nakamura, S. Higuchi, Toshiharu Ohnuma

引用次数: 1

Application of the Method of Matched Asymptotic Expansions to Solve a Nonlinear Pseudo-Parabolic Equation: The Saturation Convection-Dispersion Equation 拟抛物型非线性方程:饱和对流-色散方程的匹配渐近展开方法的应用

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.76828

C. Machado, A. Reynolds

{"title":"Application of the Method of Matched Asymptotic Expansions to Solve a Nonlinear Pseudo-Parabolic Equation: The Saturation Convection-Dispersion Equation","authors":"C. Machado, A. Reynolds","doi":"10.5772/INTECHOPEN.76828","DOIUrl":"https://doi.org/10.5772/INTECHOPEN.76828","url":null,"abstract":"In this work, we apply the method of matched asymptotic expansions to solve the one- dimensional saturation convection-dispersion equation, a nonlinear pseudo-parabolic partial differential equation. This equation is one of the governing equations for two- phase flow in a porous media when including capillary pressure effects, for the specific initial and boundary conditions arising when injecting water in an infinite radial piece- wise homogeneous horizontal medium containing oil and water. The method of matched asymptotic expansions combines inner and outer expansions to construct the global solu- tion. In here, the outer expansion corresponds to the solution of the nonlinear first-order hyperbolic equation obtained when the dispersion effects driven by capillary pressure became negligible. This equation has a monotonic flux function with an inflection point, and its weak solution can be found by applying the method of characteristics. The inner expansion corresponds to the shock layer, which is modeled as a traveling wave obtained by a stretching transformation of the partial differential equation. In the transformed domain, the traveling wave solution is solved using regular perturbation theory. By combining the solution for saturation with the so-called Thompson-Reynolds steady-state theory for obtaining the pressure, one can obtain an approximate analytical solution for the wellbore pressure, which can be used as the forward solution which analyzes pressure data by pressure-transient analysis.","PeriodicalId":114469,"journal":{"name":"Perturbation Methods with Applications in Science and Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2018-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130906584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Formal Perturbation Theory of Carleman Operators Carleman算子的形式摄动理论

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.79022

S. Bahri

引用次数: 0

Periodic Perturbations: Parametric Systems 周期扰动:参数系统

Perturbation Methods with Applications in Science and Engineering Pub Date : 2018-10-17 DOI: 10.5772/INTECHOPEN.79513

A. Morozov

引用次数: 0