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Chemical mechanical polishing as an alternative surface treatment technique for corrosion prevention of carbon steel in an acidic medium

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Scientific Reports 2025年第1期15卷 1-11页

作者： Ahmed, Mohamed Ali Al-Timimi, Buthainah Al-Ali, Maha Abdullah, Ghassan H. Khalaf Atiyaha, Safa Yaseen Ali Aljanabi, Ahmed Mel, Maizirwan Mechanical Engineering Department College of Engineering Tikrit University Tikrit Iraq Chemical Engineering Department University of Technology-Iraq Baghdad Iraq Chemical Engineering and Sustainability Department Faculty of Engineering International Islamic University of Malasiya (IIUM) Kuala Lumpur Malaysia Oil and Gas Refining Engineering Department College of Petroleum Process Engineering Tikrit University Tikrit Iraq Petroleum Systems Control Engineering Department College of Petroleum Processes Engineering Tikrit University Tikrit Iraq Modeling and Design Program Atilim University Ankara Turkey

Chemical mechanical polishing (CMP) has been a standard technique in semiconductor manufacturing for achieving smooth surfaces. CMP utilizes a synergistic interplay of chemical and mechanical interactions to achieve the desired removal rates, selectivity, and ultimately planarity with different substrate materials. In this study, the impact of CMP on the surface properties of steel used in the petroleum industry was examined, with a focus on its corrosion behavior posttreatment. Steel samples were subjected to CMP with and without an oxidizer in a silica-based slurry, and their surface characteristics were compared to those of samples polished mechanically. The addition of an oxidizer to the slurry resulted in increased material removal rates and the formation of an oxide layer on the surface;this phenomenon was not observed in CMP without an oxidizer. However, in mechanical polishing, the action of silicon carbide grains on the steel surface led to an increase in the removal rate but caused a decrease in its corrosion resistance. Compared with other treatments, the oxide layer provided a good protective barrier against corrosion and improved the corrosion resistance of the steel substrate. Based on the results from the practical study, an improvement in the corrosion resistance properties was observed due to the chemical reaction of the oxidizer and the mechanical action of the silica nanoparticles;these results showed the importance of chemical mechanical polishing as an alternative method to reduce the corrosion of steel in acidic environments. Additionally, the effect of hydrogen peroxide in a silica slurry with respect to the wettability, surface roughness, and hardness of steel was examined using contact angle measurements, profilometry, scanning electron microscopy, and microhardness tests. © The Author(s) 2025.

关键词： Chemical mechanical polishing Contact angle Electrochemical corrosion test Hydrogen peroxide oxidizer Immersion test Material removal rate Silica-based slurry Surface roughness

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Knowledge extraction from artificial neural networks models

Knowledge extraction from artificial neural networks models

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1997 IEEE International Conference on systems, Man, and Cybernetics - Computational Cybernetics and Simulation (SMC 97)

作者： Boger, Z Guterman, H Intelligent Process Control Systems Be'er-Sheva Israel

ISBN: (纸本)078034054X

The paper describes the development and application of several techniques for knowledge extraction from trained ANN models, such as the identification of redundant inputs and hidden neurons, deriving of causal relationships between inputs and outputs, and analysis of the hidden neuron behavior in classification ANN. Example of the application of these techniques is given of the faulty LED display benchmark. References of the application of these techniques are given of diverse large scale ANN models of industrial processes.

关键词： Neural networks

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Aspect orientation as a new approach for context dependent hmi adaptation

Aspect orientation as a new approach for context dependent h...

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2016 International Conference on Interfaces and Human Computer Interaction, IHCI 2016, Game and Entertainment Technologies, GET 2016 and Computer Graphics, Visualization, Computer Vision and Image processing, CGVCVIP 2016

作者： Heinze, Sebastian Ziegler, Jens Graube, Markus Urbas, Leon Department of Process Control Systems Engineering TU Dresden Germany

ISBN: (纸本)9789898533524

This article presents a concept to improve the collaborative, task-centered work in all phases of the lifecycle of a production site. Key feature of this concept is a shared access to an integrated, semantically connected information space for all users. The interaction with the information space is facilitated by means of an adaptive HMI which reconfigures itself at runtime to fit the users' needs in their current context of use. The HMI is implemented with readily available concepts and technologies of concurrent responsive web design that make it possible to also accommodate the properties of different device classes and sizes.

关键词： Semantic Web

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Thermodynamics at microscales: 3D→2D, 1D and 0D

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Green Energy & Environment 2020年第3期5卷 251-258页

作者： Kun Dong Feng Huo Suojiang Zhang State Key Laboratory of Multiphase Complex Systems Beijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing100190China

Today, the laws of traditional thermodynamics are facing challenges when science is growing rapidly toward the microscale-world, even quantum hypothesis. In this work, the thermodynamics of nano-confinement and quantu... 详细信息

关键词： Thermodynamics Confinement Quantum scale Entropy Reduced dimension

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Efficient removal of tetracycline and norfloxacin contaminants in wastewater onto N-dopped Cu/Al@Biochar as low-cost sorbent: kinetic and adsorption mechanism investigation

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Environmental Science and Pollution Research 2025年 1-20页

作者： Tchuifon Tchuifon, Donald Raoul Fotsop, Cyrille Ghislain Kenda, Georges Teikam Feudjio, Frank Dorinel Solefack Mafo, Sandrale Grace Mokue Dongmo, Dave Sanchez Mouafo Anagho, Solomon Gabche Hosseini-Bandegharaei, Ahmad Laboratory of Chemical Engineering and Industrial Bio-Processes Department of Process Engineering National Higher Polytechnic School of Douala University of Douala PO Box 2701 Douala Cameroon Faculty of Process and Systems Engineering Institute of Chemistry Universität Platz 2 Magdeburg 39106 Germany Research Unit of Noxious Chemistry and Environmental Engineering Department of Chemistry Faculty of Science University of Dschang PO Box 67 Dschang Cameroon Laboratory of Applied Physical and Analytical Chemistry Department of Inorganic Chemistry Faculty of Science University of Yaoundé1 PO Box 812 Yaoundé Cameroon Faculty of Chemistry Semnan University Semnan Iran Department of Sustainable Engineering Saveetha School of Engineering SIMATS Tamil Nadu Chennai 602105 India Centre of Research Impact and Outcome Chitkara University Punjab Rajpura 140417 India University Centre for Research & Development Chandigarh University Punjab Mohali 140413 India

In the present study, an adsorbent material (N-dopped Cu/Al@Biochar) was synthesized by integrating N, Cu, and Al atoms into the structure of a biochar. This material was characterized by several physicochemical methods, then applied to the elimination of tetracycline (TC) and norfloxacin (NC). The results obtained showed that the modification method used, although significantly altering the mesoporous structure of the original biochar, generates several functional groups on the surface of the material, giving it excellent adsorption properties. These properties were evaluated by studying the influence of various experimental parameters such as the pH of the solution, the mass of doped biochar, and the contact time on the amount of antibiotic adsorbed. Adsorption studies revealed maximum amounts of TC and NC adsorbed of 65 and 96 mg/g at pH = 8 and 6 respectively with 50 mg of adsorbent for an equilibrium time of 90 min for TC and 60 min for NC at a concentration of 15 mg/L for both antibiotics. This adsorption capacity led to the removal percentages of up to 90 and 82% for TC and NC, respectively. After five cycles of use, a decrease in adsorption efficiency of 9% for TC and 11% for NC was observed, demonstrating the impressive stability of the synthesized material. Kinetic studies revealed that the Elovich and pseudo nth order models are the most appropriate to describe the adsorption kinetics of TC and NC respectively. In addition, the two- and three-parameter isotherm models used in this study revealed multilayer adsorption processes, based on both π-π, n-π, van der Waals bond formation and hydrogen bonds. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Adsorption Biochar Doping Non-linear method Norfloxacin Tetracycline

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Computer-aided ionic liquid design for alkane/cycloalkane extractive distillation process

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Green Energy & Environment 2019年第2期4卷 154-165页

作者： Zhen Song Xinxin Li He Chao Fan Mo Teng Zhou Hongye Cheng Lifang Chen Zhiwen Qi State Key Laboratory of Chemical Engineering School of Chemical Engineering East China University of Science and Technology Process Systems Engineering Max Planck Institute for Dynamics of Complex Technical Systems

A computer-aided ionic liquid design(CAILD) study is presented for the frequently encountered alkane/cycloalkane separations in petrochemical industry. Exhaustive experimental data are first collected to extend the UNIFAC-IL model for this system, where the proximity effect in alkanes and cycloalkanes is considered specifically by defining distinct groups. The thermodynamic performances of a large number of ILs for 4 different alkane/cycloalkane systems are then compared to select a representative example of such separations. By applying n-heptane/methylcyclohexane extractive distillation as a case study, the CAILD task is cast as a mixed-integer nonlinear programming(MINLP) problem based on the obtained task-specific UNIFAC-IL model and two semi-empirical models for IL physical properties. The top 5 IL candidates determined by solving the MINLP problem are subsequently introduced into Aspen Plus for process simulation and economic analysis, which finally identify 1-hexadecyl-methylpiperidinium tricyanomethane([C_(16)MPip][C(CN)_3]) as the best entrainer for this separation.

关键词： CAILD Alkane/cycloalkane extractive distillation UNIFAC-IL MINLP process performance and economics

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A NEURAL NETWORK METHODOLOGY FOR process FAULT-DIAGNOSIS

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AICHE JOURNAL 1989年第12期35卷 1993-2002页

作者： VENKATASUBRAMANIAN, V CHAN, K Laboratory for Intelligent Process Systems School of Chemical Engineering Purdue University West Lafayette IN 47907

The ability of knowledge-based expert systems to facilitate the automation of difficult problems in process engineering that require symbolic reasoning and an efficient manipulation of diverse knowledge has generated considerable interest recently. Rapid deployment of these systems, however, has been difficult because of the tedious nature of knowledge acquisition, the inability of the system to learn or dynamically improve its performance, and the unpredictability of the system outside its domain of *** paper proposes a neural-network-based methodology for providing a potential solution to the preceding problems in the area of process fault diagnosis. The potential of this approach is demonstrated with the aid of an oil refinery case study of the fluidized catalytic cracking process. The neural-network-based system successfully diagnoses the faults it is trained upon. It is able to generalize its knowledge to successfully diagnose novel fault combinations it is not explicitly trained upon. Furthermore, the network can also handle incomplete and uncertain data. In addition, this approach is compared with the knowledge-based approach.

关键词： Chemical Operations

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Hydrated titanium(IV) oxide as a granular inorganic sorbent for removal of radiostrontium .2. Column experiment using simulated reprocessing plant waste

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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES 1996年第1期209卷 243-247页

作者： Samanta, SK Process Engineering and Systems Development Division Bhabha Atomic Research Centre Bombay (India)

The potential of hydrated titanium(IV) oxide as a granular inorganic sorbent fur radiostrontium was studied by carrying out laboratory-scale column experiment. The feed to the column was a simulated waste solution of reprocessing plant origin. The breakthrough curve for removal of radiostrontium was determined. High decontamination factors were obtained for thousands of bed volumes. ?he column loading results were correlated with batch distribution data.

关键词： Hydration

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Corrigendum to “Crystallization-Based Separation of ε-Caprolactam from a Depolymerization Reaction Mixture – Fundamentals and Potential Separation Strategies”

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Chemie Ingenieur Technik 2025年第3期97卷 247-247页

作者： Axel Schultheis Vico Tenberg Liisa Rihko-Struckmann Kai Sundmacher Heike Lorenz Physical and Chemical Foundations of Process Engineering Group Max Planck Institute for Dynamics of Complex Technical Systems Sandtorstr. 1 39106 Magdeburg Germany Process System Engineering Group Max Planck Institute for Dynamics of Complex Technical Systems Sandtorstr. 1 39106 Magdeburg Germany

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Economic Nonlinear Model Predictive control for Flexible Operation of Air Separation Units⁎

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IFAC-PapersOnLine 2018年第20期51卷 295-300页

作者： Caspari, Adrian Faust, Johannes M.M. Schäfer, Pascal Mhamdi, Adel Mitsos, Alexander AVT Process Systems Engineering RWTH Aachen University Aachen52056 Germany

The integration of renewables into the portfolio of energy sources implies that dynamic operation of energy intensive processes, such as air separation, may give an economic advantage. Dynamic process operation can be achieved by applying economic nonlinear model predictive control (eNMPC). In this work, we present an in-silico case study of dynamic operation of an air separation process under fluctuating electricity prices. Using a day-ahead electricity price profile, an offline dynamic optimization (DO) problem is solved, which is used as an initial guess to start a fast update method deployed by the eNMPC. The eNMPC uses the same objective and constraints as the offline DO. However, the prediction horizon is shorter and current states and disturbances are taken into account. A first-principle air separation process model implemented in Modelica is used in all optimization problems. All optimization problems are solved using the DO framework DyOS. The process is flexibly operated by the application of the eNMPC, which leads to near-optimal economic process behavior during operation. This work demonstrates the contribution of model based process control to the integration of renewable energy sources in the supply chain of the process industry. © 2018

关键词： Model predictive control Demand side management Electric utilities Natural resources Nonlinear systems Optimal control systems Optimization Predictive control systems Renewable energy resources Separation Source separation Supply chains Air separation Economic modeling Nonlinear model predictive control Optimal control problem Renewable energy source

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