检索结果-内蒙古大学图书馆

Heteroscedastic Bayesian Optimisation for Active Power Control of Wind Farms*

IFAC-PapersOnLine 2023年第2期56卷 7650-7655页

作者： Kiet Tuan Hoang Sjoerd Boersma Ali Mesbah Lars Imsland Department of Engineering Cybernetics Norwegian University of Science and Technology Norway Biometris Group Wageningen University & Research The Netherlands Department of Chemical and Biomolecular Engineering University of California Berkeley USA

Active power control of wind farms remains an open challenge due to inherent noise in wind power that arises from uncertain wind speed measurements and plant/model mismatch. To leverage the heteroscedastic nature of the wind power noise, heteroscedastic Bayesian optimisation (BO) is used for active power control of wind farms. BO utilises closed-loop performance data to tune the parameters of a stochastic model predictive controller (SMPC) in a systematic and data-efficient manner. This, in turn, allows for enhancing the closed-loop performance of the controller intended to decrease the power tracking error. A case study with 9 turbines in a 3 × 3 wind farm shows that the heteroscedastic BO approach achieves a reduced closed-loop power tracking error in terms of root-mean-square by 8.89% compared to one that relies on nominal BO and a decrease by 64.99% compared to a nominal model predictive controller (MPC) whose performance is not tuned using closed-loop data and BO.

关键词： Wind farm active power control stochastic model predictive control data-driven optimisation Heteroscedastic noise controller auto-tuning

来源：评论

学校读者我要写书评

暂无评论

Effect of calcination temperature on the performance of K-Co/Al2O3 catalyst for oxidative coupling of methane

引用

Carbon Resources Conversion 2025年第2期8卷

作者： Sringam, Sarannuch Witoon, Thongthai Wattanakit, Chularat Donphai, Waleeporn Chareonpanich, Metta Rupprechter, Günther Seubsai, Anusorn Department of Chemical Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand Center of Excellence on Petrochemical and Materials Technology Kasetsart University Bangkok10900 Thailand Department of Chemical and Biomolecular Engineering School of Energy Science and Engineering Vidyasirimedhi Institute of Science and Technology Rayong21210 Thailand Institute of Materials Chemistry Technische Universität Wien Vienna1060 Austria

The oxidative coupling of methane (OCM) involves directly converting methane to C2+ hydrocarbons (such as ethylene and ethane) via a reaction with oxygen. This study elucidated the effect of the calcination temperature on the structure and catalytic performance of potassium-doped-cobalt oxide supported on an alumina (K-Co/Al2O3) catalyst for the OCM reaction. The catalyst was highly active at relatively low reactor temperatures (500–640 °C). Four calcination temperatures (400, 500, 600, and 700 °C) were investigated, with the results showing that the calcination temperature strongly affected catalytic properties, such as the crystalline phases, elemental distribution, physical properties, and catalytic basicity, leading to a wide range in catalytic performances. The catalyst calcined at 400 °C was superior among the catalysts, with 8.3 % C2+ yield, 24.8 % C2+ selectivity, and 33.6 % CH4 conversion at 640 °C. Furthermore, the catalyst was robust over 24 h of testing. © 2024

关键词： Aluminum oxide

来源：评论

学校读者我要写书评

暂无评论

Magnetic NiFe_(2)O_(4)/Polypyrrole nanocomposites with enhanced electromagnetic wave absorption

引用

Journal of Materials science & Technology 2022年第13期108卷 64-72页

作者： Jiang Guo Xu Li Zhuoran Chen Jianfeng Zhu Xianmin Mai Renbo Wei Kai Sun Hu Liu Yunxia Chen Nithesh Naik Zhanhu Guo School of Materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi’an 710021China School of Urban Planning and Architecture Southwest Minzu UniversityChengdu 610041China School of Chemical Engineering Northwest UniversityXi’an 710069China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai201306China Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450001China School of Mechanical Engineering Shanghai Dianji UniversityShanghai201306China Department of Mechanical&Manufacturing Engineering Manipal Institute of TechnologyManipal Academy of Higher EducationManipal 576104KarnatakaIndia Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN37996USA

NiFe_(2)O_(4)/polypyrrole(NiFe_(2)O_(4)/PPy)nanocomposites are prepared by a simple surface-initiated polymerization method and demonstrate negative permittivity in the low frequency *** nanocomposites also exhibit significantly enhanced electromagnetic wave(EMW)absorption property in the high frequency *** with pure PPy,the enhanced negative permittivity is observed in the NiFe_(2)O_(4)/PPy nanocomposites with a NiFe_(2)O_(4)loading of 5.0,10.0,20.0 and 40.0 wt%,indicating the formation of metal-like electrical conducting network in NiFe_(2)O_(4)/PPy ***,the negative permittivity could be tuned by changing the NiFe_(2)O_(4)*** minimum reflection loss(RL)of-40.8 dB is observed in the 40.0 wt%NiFe_(2)O_(4)/PPy composites with a thickness of only 1.9 *** effective absorption bandwidth below-10.0 and-20.0 dB reaches 6.08 and 2.08 GHz,*** enhanced EMW absorption performance benefits from the improved independence matching,EMW attenuation capacity,and synergistic effects of conduction loss,dielectric loss(interfacial and dipole polarizations)and magnetic loss(exchange and natural resonances).This research work provides a guidance for the fabrication of nanocomposites with an excellent EMW absorption.

关键词： NiFe_(2)O_(4)/PPy composites Negative permittivity EMW absorption

来源：评论

学校读者我要写书评

暂无评论

Porous CuBi2O4 Photocathode with Intrinsic Cu+/Cu2+ Redox Improves Solar C(sp3)-H Bond Conversion Efficiency by an Order of Magnitude

引用

Advanced Materials 2025年第21期37卷 e2502321页

作者： Yang, Yan Yang, Xuhao Tang, Liguang Sung, Soli Wang, Zhonghao Lu, Ziyang Oh, Sang Ho Zhong, Qin Park, Jong Hyeok Zhang, Kan School of Chemistry and Chemical Engineering and School of Materials Science and Engineering Nanjing University of Science and Technology Jiangsu Nanjing210094 China Department of Chemical and Biomolecular Engineering Yonsei University 50 Yonsei-ro Seodaemun-gu Seoul120–749 Korea Republic of School of Material Science and Engineering Jiangsu University Zhenjiang212013 China Naju58330 Korea Republic of

Selective C-H activation is the most important step for organic molecule transformation. Photocatalytic radicals driven C-H activation is considered a promising route but suffers from simultaneously utilizing electron/hole pairs which are limited to broad-band gap semiconductors. Herein, a half-photocathodic reaction strategy is demonstrated to activate and oxygenate C(sp3)-H bonds of toluene toward selective benzaldehyde production using a narrow-bandgap CuBi2O4 (CBO) porous photocathode. The intrinsic Cu+/Cu2+ redox of porous CBO photocathode catalyzes the photocathodic oxygen reductive H2O2 to generate ·OH capable of oxidation which activates the C(sp3)-H bond that is further oxygenated via ·O2− formed of the photocathodic oxygen reduction. As a result, the benzaldehyde selectivity is up to 90%. Impressively, the narrow-band gap of CBO enables record-high light-driven benzaldehyde yields of 111.93 mmol m−2 h−1 with stability of over 20 h. This work opens a green and efficient light-driven C(sp3)-H bond oxidation strategy by using a narrow-bandgap photocathode. © 2025 Wiley-VCH GmbH.

关键词： Toluene

来源：评论

学校读者我要写书评

暂无评论

Understanding Interfacial Chemistry Interactions in Energy-Dense Lithium-Ion Electrodes

引用

Accounts of Materials Research 2023年第2期4卷 156-167页

作者： Donghee Gueon Miguel A.Gonzalez Kenneth J.Takeuchi Esther S.Takeuchi Amy C.Marschilok Elsa Reichmanis Department of Chemical and Bimolecular Engineering Lehigh UniversityBethlehemPennsylvania 18015United States School of Chemical and Biomolecular Engineering Georgia Institute of TechnologyAtlantaGeorgia 30332United States Interdisciplinary Science Department Brookhaven National LaboratoryUptonNew York 11973United States Institute for Energy Sustainability and Equity Stony Brook UniversityStony BrookNew York 11794United States Department of Material Science and Chemical Engineering Stony Brook UniversityStony BrookNew York 11794United States Department of Chemistry Stony Brook UniversityStony Brook 11794United States

For the past two decades,conversion and alloying-type materials have been heralded as the natural heir to commercially available graphite anodes due to their ability to deliver high gravimetric/volumetric *** of batteries with these high-energy-density active materials could impact a variety of sectors including electric vehicles,grid storage,and consumer electronics and contribute toward an ever-increasing electrified ***,the various failure mechanisms from inherent interfacial chemical instabilities associated with these materials make them unable to be merely substituted into currently available electrode fabrication and formulation processing *** a result,realizing the high theoretical capacity and achieving commercial viability of these materials will rely on the careful manipulation of interfacial chemical interactions that dictate and control various kinetic and transport processes across multiple scales of the composite *** has led to a plethora of research that has focused on systematically understanding properties of the different electrode components and designing carefully constructed electrode formulations to achieve composite electrodes with increased chemical stability,enhanced local mixed conductivities,or improved mechanical *** Account relates recent progress in the understanding of synergetic opportunities for energy-dense,resilient composite *** understanding the interplay between components of the composite electrode,we can construct enhanced well-integrated electrodes with performance metrics that surpass empirically derived *** to the increased complexity of high-volume-expanding electrodes,performance is more than the cumulative contributions of the individual components,and therefore energy and compatibility matching are important for robust electrochemical performance across cycling,rate capability,facile lithium-ion transport,and *** this Account,sy

关键词： composite interfacial electrode

来源：评论

学校读者我要写书评

暂无评论

Enhancing chemical synthesis: a two-stage deep neural network for predicting feasible reaction conditions

引用

Journal of Cheminformatics 2024年第1期16卷 11页

作者： Chen, Lung-Yi Li, Yi-Pei Department of Chemical Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei 10617 Taiwan Taiwan International Graduate Program on Sustainable Chemical Science and Technology (TIGP-SCST) No. 128 Sec. 2 Academia Road Taipei 11529 Taiwan

In the field of chemical synthesis planning, the accurate recommendation of reaction conditions is essential for achieving successful outcomes. This work introduces an innovative deep learning approach designed to address the complex task of predicting appropriate reagents, solvents, and reaction temperatures for chemical reactions. Our proposed methodology combines a multi-label classification model with a ranking model to offer tailored reaction condition recommendations based on relevance scores derived from anticipated product yields. To tackle the challenge of limited data for unfavorable reaction contexts, we employed the technique of hard negative sampling to generate reaction conditions that might be mistakenly classified as suitable, forcing the model to refine its decision boundaries, especially in challenging cases. Our developed model excels in proposing conditions where an exact match to the recorded solvents and reagents is found within the top-10 predictions 73% of the time. It also predicts temperatures within ± 20 ^∘C of the recorded temperature in 89% of test cases. Notably, the model demonstrates its capacity to recommend multiple viable reaction conditions, with accuracy varying based on the availability of condition records associated with each reaction. What sets this model apart is its ability to suggest alternative reaction conditions beyond the constraints of the dataset. This underscores its potential to inspire innovative approaches in chemical research, presenting a compelling opportunity for advancing chemical synthesis planning and elevating the field of reaction engineering. Scientific contribution: The combination of multi-label classification and ranking models provides tailored recommendations for reaction conditions based on the reaction yields. A novel approach is presented to address the issue of data scarcity in negative reaction conditions through data augmentation. Graphical Abstract: [Figure not available: see fullt

关键词： Multi-label classification Multi-task modeling Reaction condition Recommendation system

来源：评论

学校读者我要写书评

暂无评论

Superstructure Optimization of International Hydrogen Supply Chain with Technological Options

引用

IFAC-PapersOnLine 2024年第14期58卷 811-816页

作者： Juyeong Jung Jay H. Lee Wonsuk Chung Seongmin Heo Department of Chemical and Biomolecular Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Korea Department of Chemical and Materials Science and of Aerospace and Mechanical Engineering University of Southern California Los Angeles CA 90007 USA Clean Energy Research Center Korea Institute of Science and Technology (KIST) 02792 Seoul Korea

In the pursuit of reducing carbon emissions, the integration of renewable energy into society’s energy portfolio plays a crucial role despite challenges tied to their inherent unpredictability and seasonal variations. Hydrogen, as a mean of storing and transporting renewable energy becomes crucial in addressing these challenges. Notwithstanding its potential, the misalignment of cost-competitive hydrogen production hubs with demand centers calls for a thorough examination of global hydrogen distribution. The versatility of hydrogen transportation (e.g., pipelines, ships, trucks) and various forms like compressed hydrogen, liquid hydrogen, ammonia, and liquid organic hydrogen carriers (LOHC) adds complexity to designing an economically efficient hydrogen supply chain (HSC). Addressing previous scholarly limitations focused on existing technologies, this study advocates for a superstructure-based modeling approach for HSC that includes promising technologies. Through a case study involving a production site in the Middle East and a demand site in Texas, a dedicated HSC superstructure network is formulated, facilitating the identification of cost-effective hydrogen supply pathways using Mixed Integer Linear programming. Ultimately, this effort aims to establish a comprehensive framework to discern the most sustainable and financially viable technologies, identifying the optimal configuration within the HSC.

关键词： Hydrogen supply chain Process modeling Superstructure optimization Mixed Integer Linear programming

来源：评论

学校读者我要写书评

暂无评论

engineering H2O2 Self-Supplying Platform for Xdynamic Therapies via Ru-Cu Peroxide Nanocarrier: Tumor Microenvironment-Mediated Synergistic Therapy

引用

ACS Applied Materials and Interfaces 2024年第19期16卷 24172-24190页

作者： Dirersa, Worku Batu Kan, Tzu-Chun Chang, Jungshan Getachew, Girum Ochirbat, Sonjid Kizhepat, Shamsa Wibrianto, Aswandi Rasal, Akash Chen, Hung-An Ghule, Anil Vithal Chou, Tzung-Han Chang, Jia-Yaw Department of Chemical Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan Graduate Institute of Medical Sciences College of Medicine Taipei Medical University Taipei11031 Taiwan International Master/Ph.D. Program in Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan International Ph.D. Program for Cell Therapy and Regeneration Medicine College of Medicine Taipei Medical University Taipei11031 Taiwan Green Nanotechnology Laboratory Department of Chemistry Shivaji University Kolhapur416004 India Department of Chemical and Materials Engineering National Yunlin University of Science and Technology Yunlin64002 Taiwan

Of the most common, hypoxia, overexpressed glutathione (GSH), and insufficient H2O2 concentration in the tumor microenvironment (TME) are the main barriers to the advancment of reactive oxygen species (ROS) mediated Xdynamic therapies (X = photo, chemodynamic, chemo). Maximizing Fenton catalytic efficiency is crucial in chemodynamic therapy (CDT), yet endogenous H2O2 levels are not sufficient to attain better anticancer efficacy. Specifically, there is a need to amplify Fenton reactivity within tumors, leveraging the unique attributes of the TME. Herein, for the first time, we design RuxCu1-xO2-Ce6/CPT (RCpCCPT) anticancer nanoagent for TME-mediated synergistic therapy based on heterogeneous Ru-Cu peroxide nanodots (RuxCu1-xO2 NDs) and chlorine e6 (Ce6), loaded with ROS-responsive thioketal (TK) linked-camptothecin (CPT). The Ru-Cu peroxide NDs (RCp NDs, x = 0.50) possess the highest oxygen vacancy (OV) density, which grants them the potential to form massive Lewis’s acid sites for peroxide adsorption, while the dispersibility and targetability of the NDs were improved via surface modification using hyaluronic acid (HA). In TME, RCpCCPT degrades, releasing H2O2, Ru2+/3+, and Cu+/2+ ions, which cooperatively facilitate hydroxyl radical (•OH) formation and deactivate antioxidant GSH enzymes through a cocatalytic loop, resulting in excellent tumor therapeutic efficacy. Furthermore, when combined with laser treatment, RCpCCPT produces singlet oxygen (1O2) for PDT, which induces cell apoptosis at tumor sites. Following ROS generation, the TK linkage is disrupted, releasing up to 92% of the CPT within 48 h. In vitro investigations showed that laser-treated RCpCCPT caused 81.5% cell death from PDT/CDT and chemotherapy (CT). RCpCCPT in cancer cells produces red-blue emission in images of cells taking them in, which allows for fluorescence image-guided Xdynamic treatment. The overall results show that RCp NDs and RCpCCPT are more biocompatible and have excellent Xdynamic the

关键词： Oxidation

来源：评论

学校读者我要写书评

暂无评论

Electrochemical partial reduction of Ni(OH)_(2) to Ni(OH)_(2)/Ni via coupled oxidation of an interfacing NiAl intermetallic compound for robust hydrogen evolution

引用

Journal of Energy Chemistry 2023年第7期82卷 560-571,I0012页

作者： Young Hwa Yun Kwangsoo Kim Changsoo Lee Byeong-Seon An Ji Hee Kwon Sechan Lee MinJoong Kim Jongsu Seo Jong Hyeok Park Byung-Hyun Kim Hyun-Seok Cho Hydrogen Research Department Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Computational Science&Engineering Laboratory Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Analysis Center for Energy Research Korea Institute of Energy Research152 Gajeong-roYuseong-guDaejeon 34129Republic of Korea Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea

Ni-based porous electrocatalysts have been widely used in the hydrogen evolution reaction(HER)in alkaline water electrolysis,and the catalysts are produced by selective leaching of Al from Ni-Al *** is well known that chemical leaching of Ni-Al intermetallic compound(IMC)generates a high surface area in Ni(OH)_(2).However,the Ni(OH)_(2) produced by leaching the Ni-Al intermetallic compound retards the hydrogen evolution reaction,which is attributed to its weak hydrogen adsorption *** this study,we controlled the chemical state of Ni using plasma vapor deposition(PVD)followed by heat treatment,selective Al leaching,and electrochemical reduction.X-ray diffraction(XRD),scanning microscopy(SEM),transmission electron microscopy(TEM),and energy-dispersive X-ray spectroscopy(EDS)were used to confirm the phase evolution of the electrocatalysts during *** reveal that the heat-treated Ni-Al alloy with a thick Ni2Al3surface layer underwent selective Al leaching and produced biphasic interfaces comprising Ni(OH)_(2) and NiAl IMCs at the edges of the grains in the outermost surface *** oxidation of the interfacing NiAl IMCs facilitated the partial reduction of Ni(OH)_(2) to Ni(OH)_(2)/Ni in the grains during electrochemical reduction,as confirmed by X-ray photoelectron spectroscopy(XPS).An electrocatalyst containing partially reduced Ni(OH)_(2)/Ni exhibited an overpotential of 54 mV at 10 mA/cm^(2) in a half-cell measurement,and a cell voltage of 1.675 V at 0.4 A/cm2for single-cell operation.A combined experimental and theoretical study(density functional theory calculations)revealed that the superior HER activity was attributed to the presence of partially reduced metallic Ni with various defects and residual Al,which facilitated water adsorption,dissociation,and finally hydrogen evolution.

关键词： Raney nickel HERchemical leaching Intrinsic activity Partial reduction

来源：评论

学校读者我要写书评

暂无评论

Catalytic Conversion of Soluble Aniline into Insoluble N-Phenylphenazine for Wastewater Treatments

SSRN

引用

SSRN 2024年

作者： Wang, Ying Zhang, Zhuang Yang, Kun-Lin Department of Chemical and Biomolecular Engineering National University of Singapore 4 Engineering Drive 4 117585 Singapore Department of Materials Science & Engineering National University of Singapore 7 Engineering Drive 1 117574 Singapore

Aniline, a prevalent pollutant in industrial wastewater, necessitates efficient removal methods with minimal chemical usage. Deviating from conventional approaches, a two-step catalytic oligomerization process has been devised to convert soluble aniline into insoluble oligomers. In the first step, aniline undergoes oxidation with H2O2 and a green catalyst, iron tetraamido macrocyclic ligand (Fe-TAML), to form aniline tetramers or pentamers. In the second step, these oligoanilines are further oxidized using H2O2 alone, yielding N-phenylphenazine, which precipitates due to its conjugated macrocyclic structure. The resultant precipitates can be easily separated from the solution through decantation or gravity filtration, without generating secondary waste. Process optimization revealed that only 3 mg/L of Fe-TAML and 2 g/L of H2O2 are required to treat 1 g/L of aniline, achieving a remarkable 96.8% aniline removal efficiency and a 62.5% precipitate yield. This innovative approach holds promise for treating aniline and similar aromatic compounds in real industrial wastewater scenarios. © 2024, The Authors. All rights reserved.

关键词： Wastewater treatment

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：