检索结果-内蒙古大学图书馆

05AIChE: 2005 AIChE Annual Meeting and Fall Showcase

作者： Luís, Dário A. F. Astolfi, A. Kershenbaum, L. Centre for Process Systems Engineering Department of Chemical Engineering and Chemical Technology Imperial College London Department of Electrical and Electronic Engineering Imperial College London

This work examines a nonlinear algorithm to control a class of chemical reactors in which a highly exothermic reaction takes place, and gives relevance to the controller's experimental performance in a real application equivalent to what is encountered in industry. The control objective is to maintain the temperature inside the reactor by manipulating two variables. Several options are available;in this work, we consider as controls the cooling supplied by the jacket and the inlet concentration of one reactant (or, alternatively, the concentration of a homogenous catalyst or promoter of the flow rate of a diluent). These variables are most easily adjusted in the experimental set-up used to test the performance of the Lyapunov-based nonlinear robust controller developed previously. This work fills a gap caused by the lack of experimental applications of the numerous different nonlinear controller proposals to relevant real life situations. It provides some experimental results, which were obtained in a pilot plant CSTR. The reactor is a pilot plant among the facilities in the laboratories at Imperial College London. The results obtained are consistent with earlier simulation studies. They strongly suggest the ability of the proposed controller to globally stabilise the closed loop system and to achieve the desired setpoint(s) as long as the control problem is feasible within the available bounded inputs.

关键词： Nonlinear control systems

来源：评论

学校读者我要写书评

暂无评论

Genetically tuned decentralized proportional-integral controllers for composition control of reactive distillation

Genetically tuned decentralized proportional-integral contro...

引用

作者： Sumana, C. Venkateswarlu, Ch. Department of Chemical Engineering Sciences Process Dynamics and Control Group Indian Institute of Chemical Technology Hyderabad-500 007 India

This paper presents a genetic algorithm (GA) based autotuning method to design a decentralized proportionalintegral (PI) control system for composition control of a highly interactive and nonlinear reactive distillation column. The control relevant characteristics such as nonlinearities, interactions, and stability are analyzed for assessing the complexity of the process. The objective of GA tuning is to account the multivariable interactions and nonlinear dynamics of the process to find a unique set of parameters for the control system that is robust to all kinds of disturbances. The performance function in GA is formulated by incorporating the dynamic state information of the process derived from its model for various closed-loop disturbance conditions. The controller tuning problem of this multivariable process is resolved as an optimization problem and multiloop PI controllers are designed by exploiting the powerful global search features of GA. An estimator is designed to provide the compositions which serve as inferential measurements to the controllers. The performance of the proposed GA-tuned decentralized control scheme is evaluated by applying it to a metathesis reactive distillation column, and the results are compared with conventionally tuned PI controllers. The results demonstrate the better regulatory and servo performance of the GA-tuned PI controllers for composition control of reactive distillation column. © 2010 American chemical Society.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Decoding and quantitative detection of antibiotics by a luminescent mixed-lanthanide-organic framework

引用

Frontiers of Environmental Science & engineering 2022年第12期16卷 55-65页

作者： Yuping Wang Jing Xia Yanxin Gao Department of Environmental Science and Engineering Fuzhou UniversityMinhou350108China State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental EngineeringEast China University of Science and TechnologyShanghai200237China

Due to the potential risk of antibiotics to the environment,the development of inexpensive,simple,and reliable antibiotic detection methods is significant but also faces *** this work,several lanthanide-organic frameworks(LOFs),constructed from lanthanide ions(Eu3+and/or Tb3+)and 1,3,5-benzene-tricarboxylic acid(BTC),were synthesized by solvothermal ***-S3 with comparable emission peaks of 5D4→7F5(Tb3+,545 nm)and 5D0→7F2(Eu3+,618 nm)was selected as a luminescent *** this system,the highly efficient energy transferred from the organic linker to lanthanide ions and from Tb3+to Eu3+***-S3 sensor was capable of decoding antibiotics by distinguishable emission intensity ***,a two-dimensional decoded map of antibiotics was *** linear relationship between antibiotic concentration and emission intensity ratio indicated the quantitative determination of antibiotics was *** a typical analyte,the response mechanism of nalidixic acid(NA)was investigated in *** competition of NA and BTC for UV light absorption,as well as the binding propensity of NA and Tb,affected the organic linkers-to-lanthanide ions and Tb-to-Eu energy transfer,resulting in the change of fluorescence intensity *** self-calibrating mixed-LOF sensor overcame the uncontrollable errors of the traditional absolute emission intensity method and generated stable luminescent signals in multiple ***,the integration of LOF-S3 with polymer fibers enabled the formation of a LOF-polymer fibrous composite with fluorescence detection capability,which is a promising portable sensor for practical applications.

关键词： Antibiotics Sensor Luminescence Lanthanide-organic frameworks

来源：评论

学校读者我要写书评

暂无评论

Leaf metabolomic traits decipher the invasiveness of Alternanthera philoxeroides in urban wetlands

引用

Science of the Total Environment 2025年 968卷 178888页

作者： Huang, Xiaolong Yang, Jinming Yang, Xue Wang, Tong Meng, Jie Guo, Xiao Wang, Yang Xiong, Wen Zeng, Jin Wu, Zhaoshi Li, Kuanyi Jeppesen, Erik Key Laboratory of Lake and Watershed Science for Water Security Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing211135 China College of Landscape Architecture and Forestry Qingdao Agricultural University Qingdao266109 China Key Laboratory for Green Chemical Process of Ministry of Education Hubei Key Laboratory of Novel Reactor and Green Chemical Technology Institute of Changjiang Water Environment and Ecological Security School of Environmental Ecology and Biological Engineering Wuhan Institute of Technology Wuhan430205 China College of Life Sciences Hubei Normal University Huangshi435002 China Sino-Danish College University of Chinese Academy of Sciences Beijing China Department of Ecoscience Aarhus University Aarhus Denmark Limnology Laboratory Department of Biological Sciences and Centre for Ecosystem Research and Implementation Middle East Technical University Ankara Turkey Institute of Marine Sciences Middle East Technical University Erdemli-Mersin Turkey Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan University Kunming China

Urbanisation has been considered to promote exotic plant invasion. Ecophysiology predicts phenotypic variation and potential evolution following urbanisation and can be used to evaluate plant invasiveness. However, few studies have included the role of ecophysiological traits for such invasiveness in urban ecosystems. Traditional plant functional traits have been used but have their limitations. Novel approaches such as metabolomics may potentially be useful. The present study explored the invasiveness of the cosmopolitan noxious invasive plant Alternanthera philoxeroides in urban and periurban areas of a megacity city in China using both traditional leaf functional traits and novel leaf metabolome as indicators. We found that traditional leaf functional traits, including specific leaf area, nitrogen concentration, carbon:nitrogen ratio and construction costs, did not differ between urban and periurban A. philoxeroides populations. However, metabolomic profiling showed that the urban populations had an up-regulated expression of zeatin and purine, two cytokinins correlated with plant growth and a down-regulated expression of isoflavonoids, a defensive metabolite for herbivory. Leaf metabolome may, therefore, be sensitive in deciphering the facilitative effects of urbanisation on plant invasion. We also found that the urban populations of A. philoxeroides accumulated more beneficial microbes, which might enhance their invasiveness. Urbanisation likely promotes exotic plants invasion through generation of metabolites, which stimulates growth via modification of the soil microbiome. Our results indicate that leaf metabolome may be used for interpreting plant invasiveness and predicting plant invasion. © 2025 Elsevier B.V.

关键词： Plant diseases

来源：评论

学校读者我要写书评

暂无评论

Factor analysis thermography for defect detection of panel paintings

引用

Quantitative InfraRed Thermography Journal 2023年第1期20卷 25-37页

作者： Liu, Kaixin Huang, Kai-Lun Sfarra, Stefano Yang, Jianguo Yi, Liu Yuan, Yao Institute of Process Equipment and Control Engineering Zhejiang University of Technology Hangzhou China Department of Chemical Engineering National Tsing Hua University Hsinchu Taiwan Department of Industrial and Information Engineering and Economics University of L’Aquila L’Aquila Italy

Active infrared thermography is an important non-destructive testing method used for revealing defect structures in materials. In many applications, thermographic data processing is necessary to extract defect features from a large number of thermal images. This work proposes to use a factor analysis thermography (FAT) method that automatically extracts defect features from thermograms via exploratory factor analysis, in tandem with a fuzzy c-means (FCM) clustering algorithm to segment the defects and background. By means of factor rotation, factor analysis minimises the complexity of factor loadings and makes the results more interpretable. Consequently, the defect information is extracted while large signal-to-noise ratios are obtained. Employing the FCM image segmentation algorithm on factor loading images reduces the interference of background on human visual detection. Additionally, the parameter selection is emphasised and addressed. Experiments on a panel painting illustrate that the proposed method promotes the accuracy and efficiency of thermographic detection of defects, compared with the popular principal component thermography (PCT) method. © 2021 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Nondestructive examination

来源：评论

学校读者我要写书评

暂无评论

Online tuning of a steady state crude distillation unit model for real time applications

Online tuning of a steady state crude distillation unit mode...

引用

作者： Dave, Dhaval J. Dabhiya, Murtuza Z. Satyadev, S.V.K. Ganguly, Saibal Saraf, Deoki N. Process Control Laboratory Department of Chemical Engineering Indian Institute of Technology Kanpur 208016 India Indian Institute of Technology Kharagpur India

The steady state simulators, used for on-line performance prediction and for on-line optimization in crude distillation units are often sensitive to small variations in the feed composition, which is specified in terms of a True Boiling Point (TBP) vs volume percent distilled curve. The exact feed TBP is often not available during the plant operation. Also stratification of raw crude oil into layers in the large tank farm sections cause severe operating problems in terms of the stability of the column. If feed TBP can be predicted online, necessary feedforward action can considerably reduce the operating problems. A model has been developed for backcalculation of feed TBP using measured plant parameters. A heat balance is performed around an envelope encompassing the rectifying section of the fractionator and is followed by the calculation of Equilibrium Flash Vaporization (EFV) temperatures at six different locations of the column which are correlated with corresponding feed TBP temperatures. The second part of model tuning consists of calculating model parameters in the form of point efficiencies so as to minimize the discrepancy between the simulator predicted and measured column parameters which arises out of modelling approximations such as assumption of phase equilibria at each stage and use of imperfect thermodynamics correlations. The simulator results, after tuning, were found to match the plant measurements within two percent in all the cases investigated. The simulator output was used to predict various product properties using a Property Prediction package and these were also found to match well with those of laboratory measurements. Both the backcalculation of feed TBP and the efficiency tuning need to be implemented on-line for inferential control and supervisory optimization. © 2003 Elsevier Science Ltd. All rights reserved.

关键词： process control

来源：评论

学校读者我要写书评

暂无评论

Multi-site performance monitoring in batch pharmaceutical production 7th

Multi-site performance monitoring in batch pharmaceutical pr...

引用

7th International Symposium on Advanced control of chemical processes, ADCHEM 2003

作者： Wong, C.W.L. Escott, R.E.A. Morris, A.J. Martin, E.B. Centre for Process Analytics and Control Technology School of Chemical Engineering and Advanced Materials University of Newcastle Newcastle upon TyneNE1 7RU United Kingdom GlaxoSmithKline Chemical Development Tonbridge United Kingdom

A challenge facing the pharmaceutical and chemical industries is how to understand and identify differences in process behaviour where a product is manufactured at two different sites. Three approaches based on multi-group principal component analysis are investigated and benchmarked against single site models. The multi-group approach is shown to remove differences between sites such as operational scale thereby enabling the analysis to focus on identifying differences in variation between the two sites that are not a consequence of process configurations. From the analysis it is observed that the multi-group approach can assist in the understanding of manufacturing performance. Copyright © IFAC 2003

关键词： chemical industry

来源：评论

学校读者我要写书评

暂无评论

Soot formation in propane/air diffusion flames

引用

2nd International Conference on Materials Science and engineering, ICMSE 2013

作者： Sun, Xue Zhang, D.-W. Ning, G.-L. Department of Chemical material Engineering School of Chemical Engineering Dalian University of Technology Dalian 116012 China Department of Process Equipment and Control Engineering School of Chemical Engineering Dalian University of Technology Dalian 116012 China

ISBN: (纸本)9783037856444

Soot formation and growth in propane/air diffusion flames in a wide range of mole ratio of propane to air from 0.01 to 0.1 have been studied experimentally and theoretically. The concentration of acetylene, soot yield and particle size have been measured and the growth of soot particle has been simulated from surface growth and nucleation processes. The rate coefficient of surface growth has been correlated with the mole ratio of propane to air and the comparisons of particle size between measured and calculated results have been made. © (2013) Trans Tech Publications, Switzerland.

关键词： Propane

来源：评论

学校读者我要写书评

暂无评论

NEURAL NETWORK BASED ON-LINE RE-OPTIMISATION OF FED-BATCH processES USING ITERATIVE DYNAMIC PROGRAMMING FOR DISCRETE-TIME SYSTEMS

引用

IFAC Proceedings Volumes 2002年第1期35卷 289-294页

作者： Zhihua Xiong Jie Zhang Centre for Process Analytics and Control Technology Department of Chemical and Process Engineering University of Newcastle Newcastle upon Tyne NE1 7RU U. K.

Optimisation of fed-batch processes can be described as a constrained nonlinear end-point dynamic optimisation problem. Although iterative dynamic programming (IDP) is feasible, it is usually very time-consuming and very difficult to apply to on-line optimisation because of solving the non-linear differential-algebraic equations of the process model in each iteration. The replacement of a rigorous mechanistic model by an equivalent neural network (NN) model takes the advantage of high speed processing, since simulation with a NN model involves only a few non-iterative algebraic calculations. To use IDP algorithm for NN model based on-line re-optimisation, a modified algorithm is proposed and is called as iterative dynamic programming for discrete-time system ( IDP/DTS ). The novel IDP/DTS algorithm can obtain a reduction of many times in computational time compared to the conventional IDP algorithm. In this paper, an effective optimisation and control scheme for on-line re-optimisation of fed-batch processes is proposed based on NN models and the novel IDP/DTS algorithm. The proposed scheme is illustrated using simulation studies of an ethanol fermentation process.

关键词： neural networks on-line re-optimisation IDP IDP/DTS algorithm fed-batch processes

来源：评论

学校读者我要写书评

暂无评论

Simultaneous removal of Congo red and cadmium(Ⅱ) from aqueous solutions using graphene oxide–silica composite as a multifunctional adsorbent

引用

Journal of Environmental Sciences 2020年第12期32卷 151-160页

作者： Ebrahim Mahmoudi Sepehr Azizkhani Abdul Wahab Mohammad Law Yong Ng Abdelbaki Benamor Wei Lun Ang Muneer Ba-Abbad Department of Chemical and Process Engineering Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangor Darul EhsanMalaysia Department of Chemical and Environmental Engineering Faculty of EngineeringUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Chemical Engineering Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul RahmanJalan Sungai LongBandar Sungai LongCheras43000 KajangSelangorMalaysia Centre for Sustainable Process Technology(CESPRO) Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiSelangor Darul EhsanMalaysia Gas Processing Centre Qatar UniversityP.O.Box 2713DohaQatar

Graphene oxide is a very high capacity adsorbent due to its functional groups and π-π interactions with other compounds. Adsorption capacity of graphene oxide, however, can be further enhanced by having synergistic effects through the use of mixed-matrix composite. In this study, silica-decorated graphene oxide(SGO) was used as a high-efficiency adsorbent to remove Congo red(CR) and Cadmium(Ⅱ) from aqueous solutions. The effects of solution initial concentration(20 to 120 mg/l), solution pH(pH 2 to 7), adsorption duration(0 to 140 min) and temperature(298 to 323 K) were measured in order to optimize the adsorption conditions using the SGO adsorbent. Morphological analysis indicated that the silica nanoparticles could be dispersed uniformly on the graphene oxide surfaces. The maximum capacities of adsorbent for effective removal of Cd(Ⅱ) and CR were 43.45 and 333.33 mg/g based on Freundlich and Langmuir isotherms, respectively. Langmuir and Freundlich isotherms displayed the highest values of Q max for CR and Cd(Ⅱ) adsorption in this study, which indicated monolayer adsorption of CR and multilayer adsorption of Cd(II) onto the SGO, respectively. Thermodynamic study showed that the enthalpy( H) and Gibbs free energy( G) values of the adsorption process for both pollutants were negative, suggesting that the process was spontaneous and exothermic in nature. This study showed active sites of SGO( π-π, hydroxyl, carboxyl, ketone, silane-based functional groups) contributed to an enormous enhancement in simultaneous removal of CR and Cd(Ⅱ) from an aqueous solu-tion, Therefore, SGO can be considered as a promising adsorbent for future water pollution control and removal of hazardous materials from aqueous solutions.

关键词： Graphene-oxide Multifunctional adsorbent Competitive removal Heavy metal-dye removal

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：