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Utilizing the Vector Autoregression Model (VAR) for Short-Term Solar Irradiance Forecasting

Energy and Power engineering 2023年第11期15卷 353-362页

作者： Farah Z. Najdawi Ruben Villarreal Department of Material Science Engineering and Commercialization Texas State University San Marcos USA

Forecasting solar irradiance is a critical task in the renewable energy sector, as it provides essential information regarding the potential energy production from solar panels. This study aims to utilize the Vector Autoregression (VAR) model to forecast solar irradiance levels and weather characteristics in the San Francisco Bay Area. The results demonstrate a correlation between predicted and actual solar irradiance, indicating the effectiveness of the VAR model for this task. However, the model may not be sufficient for this region due to the requirement of additional weather features to reduce disparities between predictions and actual observations. Additionally, the current lag order in the model is relatively low, limiting its ability to capture all relevant information from past observations. As a result, the model’s forecasting capability is limited to short-term horizons, with a maximum horizon of four hours.

关键词： Vector Autoregression Model Hyperparameter Parameters Augmented Dickey Fuller Durbin Watson’s Statistics

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Alicyclic Dianhydrides and Polyimides Containing Double-Bond Bridged Cyclohexanes and Investigations on Their Retro Diels-Alder Reaction

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ACS Applied Polymer materials 2023年第1期5卷 602-613页

作者： Zhong, Kai-Cheng Chen, Jyh-Chien Lee, Shih-Wei Wu, Hsin-Chung Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan R & D Center LCY Chemical Corporation Kaohsiung811645 Taiwan Material and Chemical Research Laboratories Division of Organic Opto-electronic Materials and Applications Industrial Technology Research Institute Hsinchu31057 Taiwan

In this study, two alicyclic dianhydrides, bicyclo[2.2.2]oct-7-ene-2-exo,3-exo,5-exo,6-exo,7-methyltetracarboxylic-2,3:5,6-dianhydride (MBTA) and bicyclo[2.2.2]oct-7-ene-2-exo,3-exo,5-exo,6-exo,7,8-dimethyltetracarboxylic-2,3:5,6-dianhydride (DMBTA), containing methyl substituents on the double-bond bridged cyclohexane structures were successfully synthesized by Diels-Alder reaction. The chemical structures of these dianhydrides with exo-exo configuration were fully characterized by NMR spectroscopy and X-ray single crystal diffraction. Alicyclic polyimides were prepared from these dianhydrides and diamines, such as 4,4′-oxydianiline (4,4′-ODA) and 2,2′-bis(trifluoromethyl)benzidine (TFMB). The introduction of methyl substituents on the double-bond bridges exhibits enhancements in various properties compared with their nonsubstituted analogs. These polyimides with high molecular weights can form flexible, transparent, and colorless films with superior optical transmittance at wavelength 400 nm (T400) of 86-88% and yellow indices (b*) of 0.32-0.87. They also showed high thermal stability with the degradation temperature at 5% weight loss (Td5%) of 423-447 °C in nitrogen and glass transition temperature (Tg) of 372-417 °C. These polyimides are good candidates as substrates for flexible electronic application. These polyimides also showed excellent solubility in organic solvents. Especially, PI-MBTA/TFMB and PI-DMBTA/TFMB are soluble even in low-boiling-point solvents such as cyclopentanone (CPN), implying the potential application as negative photosensitive polyimides (PSPIs) using CPN as the developing solvent. The double bonds of the bridges of MBTA and DMBTA cannot be hydrogenated with hydrogen pressure of 1-4.5 kg cm-2 using palladium on carbon as the catalyst at room temperature for 1-5 days. This could be attributed to the steric hindrance of the methyl substituents on the double bond. From the results of model compounds and the addition of strong dienophile (ma

关键词： Polyimides

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Reaction Mechanism of Ethylene Oxide at Various Oxygen/Ethylene Oxide Ratios in an RF Cold Plasma Environment

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Aerosol and Air Quality Research 2024年第2期5卷 185-203页

作者： Liao, Wei-Tung Wei, Ta-Chin Hsieh, Lien-Te Tsai, Cheng-Hsien Shih, Minliang Department of Chemical and Material Engineering Southern Taiwan University of Technology Tainan Taiwan Department of Chemical Engineering Chung-Yuan University Chung Li Taiwan Department of Environmental Engineering and Science National Pingtung University of Science and Technology Pingtung Taiwan Department of Chemical and Material Engineering National Kaohsiung University of Applied Sciences Kaohsiung Taiwan Department of Environmental Engineering and Science Chia-Nan University of Pharmacy and Science Tainan Taiwan

An innovative method was used to simulate ethylene oxide (EO) oxidation in an RF plasma reactor. The objective of this work was to simulate the stable species mole fraction profiles measured in a flowing plasma system at constant temperature and pressure. The mechanism involved participation of 36 species in 140 elementary reactions. Sensitivity analysis was also performed to identify the order of significance of reactions in the mechanism of the model’s predictions. The results show that the main_reactions for EO decomposition changed with a varying O2/EO ratio in the plasma system. That is to say, the most important reaction to the O2/EO ratio of zero was the electron dissociation reaction of EO, C2H4O + e- → CH3CHO + e-. While, the most influential reaction for EO decomposition at O2/EO ratio of 5.0 was the formation reaction of HO2, which forms OH radicals, then enhances the decomposition of C2H4O by the reaction, C2H4O + OH = C2H3O + H2O.

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Trivalent Ni oxidation controlled through regulating lithium content to minimize perovskite interfacial recombination

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Rare Metals 2022年第1期41卷 96-105页

作者： Jin-Jin Zhao Xiao Su Zhou Mi Ying Zhang Yan-Jun Hu Hua-Jun Guo Yi-Nan Jiao Yu-Xia Zhang Yan Shi Wei-Zhong Hao Jing-Wei Wu Yi Wang Cun-Fa Gao Guo-Zhong Cao School of Materials Science and Engineering School of Mechanical EngineeringShijiazhuang Tiedao UniversityShijiazhuang 050043China School of Materials Science and Engineering Hebei Key Laboratory of Material Near Net Forming TechnologyHebei University of Science and TechnologyShijiazhuang 050018China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA

Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation *** this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n... 详细信息

关键词： Lithium ions Ni^(3+) Oxidized defect Photocurrent Perovskite solar cells

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MXene Enhanced 3D Needled Waste Denim Felt for High‑Performance Flexible Supercapacitors

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Nano-Micro Letters 2024年第2期16卷 383-394页

作者： Wei Fan Qi Wang Kai Rong Yang Shi Wanxi Peng Handong Li Zhanhu Guo Ben Bin Xu Hua Hou Hassan Algadi Shengbo Ge Key Laboratory of Functional Textile Material and Product of the Ministry of Education School of Textile Science and EngineeringInstitute of Flexible electronics and Intelligent TextileXi’an Polytechnic UniversityXi’an 710048People’s Republic of China Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China Henan Province International Collaboration Lab of Forest Resources Utilization School of ForestryHenan Agricultural UniversityZhengzhou 450002People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Electrical Engineering Faculty of EngineeringNajran University11001 NajranSaudi Arabia

MXene,a transition metal carbide/nitride,has been prominent as an ideal electrochemical active material for ***,the low MXene load limits its practical *** environmental concerns and sustainable development become more widely recognized,it is necessary to explore a greener and cleaner technology to recycle textile by-products such as *** present study proposes an effective 3D fabrication method that uses MXene to fabricate waste denim felt into ultralight and flexible supercapacitors through needling and *** 3D structure provided more sites for loading MXene onto Z-directional fiber bundles,resulting in more efficient ion exchange between the electrolyte and ***,the carbonization process removed the specific adverse groups in MXenes,further improving the specific capacitance,energy density,power density and electrical conductivity of *** electrodes achieve a maximum specific capacitance of 1748.5 mF cm-2 and demonstrate remarkable cycling stability maintaining more than 94%after 15,000 galvanostatic charge/discharge ***,the obtained supercapacitors present a maximum specific capacitance of 577.5 mF cm^(-2),energy density of 80.2μWh cm^(-2)and power density of 3 mW cm^(-2),*** resulting supercapacitors can be used to develop smart wearable power devices such as smartwatches,laying the foundation for a novel strategy of utilizing waste cotton in a high-quality manner.

关键词： MXene 3D needled waste denim felt Supercapacitors Carbonization

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Prussian blue analogue derived NiCoSe_(4) coupling with nitrogen-doped carbon nanofibers for pseudocapacitive electrodes

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Chinese Chemical Letters 2023年第11期34卷 297-301页

作者： Guohao Yang Chengang Pei Fang Xu Ho-Seok Park Xu Yu Huan Pang School of Material Science and Engineering Guizhou Minzu UniversityGuiyang 550025China School of Chemical Engineering Guizhou Minzu UniversityGuiyang 550025China Department of Chemical Engineering College of EngineeringSungkyunkwan UniversitySuwon-siGyeonggi-do 440-746Republic of Korea School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China

The design of pseudocapacitive materials by coupling transition metal compounds with a conductive carbon matrix is important for the high performance of ***,we construct the Prussian blue analogue derived nickel-cobalt selenides coupling with nitrogen-doped carbon nanofibers(NiCoSe_(4)-NCNFs)by carbonization and selenization of polyacrylonitrile *** effect of selenization and element N doping on the morphological structure and surface chemistry of NiCoSe_(4)-NCNFs are *** to the accelerated electrolyte ion diffusion,enlarged active surface area and the modified surface chemistry by the strong interaction at NiCoSe_(4)/NCNFs interfaces,NiCoSe_(4)-NCNFs show excellent capacitive behaviors in 1 mol/L KOH,and the specific capacitance is 1257 F/g at 1 A/g with a rate capability of 78%and cyclic stability of 82.9%.The Gibbs free energy of adsorption OH−is calculated by density functional theory to investigate the charge storage *** work offers a new strategy to construct the transition metal selenides/carbon nanofibers hybrids for high-performance supercapacitor devices.

关键词： Electrospinning Carbon nanofibers Supercapacitors Heteroatom doping Metal selenides

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Energy band engineering of Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction for enhanced photocatalytic reduction of CO_(2)

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Journal of materials science & Technology 2022年第16期111卷 17-27页

作者： Guojing Wang Zhiwei Tang Jing Wang Shasha Lv Yunjie Xiang Feng Li Chong Liu School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China Department of Electronic Materials Science and Engineering School of Materials Science and EngineeringSouth China University of TechnologyGuangzhou 510640China Key Laboratory of Beam Technology and Material Modification Ministry of EducationCollege of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China School of Materials and Energy Southwest UniversityChongqing 404100China

In this work,a Bi_(2)O_(2.33)–CdS direct Z-scheme heterojunction was fabricated based on energy band *** Bi_(2)O_(2.33)core nanoflakes were first synthesized by electrodeposition which was followed by an annealing process to fabricate this *** the Cd S shell was deposited on Bi_(2)O_(2.33)nanoflakes utilizing the solution method,during which a suitable concentration of Cd Clsolution was used for forming a homogeneous and continuous integrated CdS shell.A space charge region and an internal electric field from CdS(+)to Bi_(2)O_(2.33)(-),which drove a direct Z-scheme charge transfer process,were formed at the *** Bi_(2)O_(2.33)–CdS exhibited excellent photocatalytic performance for CO_(2)reduction mainly attributed to the satisfactory photoinduced charge separation and transport efficiency in the direct Z-scheme *** photocatalytic CO_(2)reduction ability of Bi_(2)O_(2.33)–CdS was significantly enhanced compared with single Bi_(2)O_(2.33)or Cd S,with a CO_(2)yield rate of ca.2.9μmol/(cm^(2)h)under a 300 W Xe *** reduction of CO_(2)to CO_(2)demonstrated 94.0%selectivity.

关键词： Photocatalysis Cds Nanocomposite Vacancies Direct z-scheme heterojunction

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Seismic performance enhancement of RC framed structures through retrofitting and strengthening: an experimental and numerical study

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Asian Journal of Civil engineering 2024年第1期25卷 555-573页

作者： Wahab, Abdul Ghafar Zhong, Tao Wei, Fangfang Hakimi, Nadimullah Ahiwale, Dhiraj D. Civil Engineering and Architecture Faculty Kunming University of Science and Technology Kunming 650500 China Yunnan Earthquake Engineering Research Institute Kunming 6505000 China Civil Engineering and Transportation Engineering Faculty Hehai University Nanjing 2110024 China Faculty of Material Science and Engineering Kunming University of Science and Technology Kunming 650500 China Department of Civil Engineering Vidya Pratishthan’s Kamalnayan Bajaj Institute of Engineering and Technology Baramati SPPU Pune 413133 India

This study investigates the seismic performance of a two-bay, two-story reinforced concrete (RC) framed structure and proposes a retrofitting strategy by removing a column and strengthening the adjoining beams and columns using RC jacketing and post-tensioning tendons. Experimental testing and numerical simulations are conducted to assess the effectiveness of the retrofitting method. The experimental results indicate that the retrofitted RC frame exhibits enhanced lateral stiffness and shear force resistance, resulting in reduced shear deformation compared to the existing RC frame. However, the two frames’ ductility and energy dissipation characteristics remain similar. Notably, failure in the retrofitted frame occurs primarily in the second-story beam–column joint, whereas the original frame experiences failure at the ground-floor beam–column joints. Furthermore, a numerical macro-based finite element model is developed in OpenSEES, validated with experimental data, and utilized for a parametric study. The numerical findings suggest that retrofitting is suitable when the axial compression ratio of the second story’s side columns is kept below 0.52. Attention should be given to the size of the retrofitted columns to avoid compromising the upper floor’s structural integrity, as the retrofitting process may result in a softer upper floor. It is essential to regulate the dimensions of retrofitted columns and ensure that the elastic lateral stiffness of the retrofitted story is greater than the upper story. In this case, a 350 and 300 mm column depth had acceptable performance. Overall, this study provides valuable insights into the seismic performance of retrofitted RC-framed structures. The findings emphasize the importance of appropriate column sizing and maintaining adequate lateral stiffness to enhance retrofitted buildings’ structural integrity and seismic resistance. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Column removal Crack pattern Numerical simulation Post-tensioning RC frame Strengthening Structural retrofitting

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Self-healing of active site in Co(OH)_(2)/MXene electrocatalysts for hydrazine oxidation

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Journal of materials science & Technology 2024年第36期203卷 108-117页

作者： Kun Xiang Yongjing Wang Zechao Zhuang Jing Zou Neng Li Dingsheng Wang Tianyou Zhai Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The development of efficient hydrazine oxidation reaction(HzOR)catalysts is important for the construc-tion of remarkable energy storage and conversion ***,after a period of electrochemical reaction,the active site of the catalyst will be irreversibly reduced or inactivated,and how to recover the active site is a major ***,we report 2D Co(OH)_(2)/Ti_(3)C_(2)(OH)_(x)MXene composites with rapid re-construction and self-healing behaviors as efficient and stable electrocatalysts during HzOR *** experimental and theoretical results indicate that the introduction of Ti_(3)C_(2)(OH)_(x)MXene can effectively reduce the dehydrogenation barrier of Co(OH)_(2),from 0.584 eV to 0.481 eV to form the real catalytic active center Co(OH)***,Co(OH)O/Ti_(3)C_(2)(OH)_(x)MXene composites with metal-like conductiv-ity not only present spontaneous adsorption capacity of N_(2)H_(4),but also can modulated rate-determining step of dehydrogenation of∗N_(2)H_(4)to∗N_(2)H_(3)(0.54 eV)compared with Co(OH)***,the electrophilic oxygen of Co(OH)O/Ti_(3)C_(2)(OH)_(x)can spontaneously obtain electrons and protons from N_(2)H_(4),achieving the oxidation of N_(2)H_(4)while reducing Co(OH)O to Co(OH)_(2),thus completing the self-healing of the efficient catalyst.

关键词： Hydrazine oxidation Self-healing Reconstruction Co(OH)_(2)/MXene Electrocatalysis

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Correlating dynamic relaxation and viscoelasticity in metallic glasses

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science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 81-90页

作者： GuangHui Xing Qi Hao Fan Zhu Yun-Jiang Wang Yong Yang Hidemi Kato Eloi Pineda Si Lan JiChao Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Department of Mechanical Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Department of Materials Science and Engineering College of EngineeringCity University of Hong KongHong Kong 999077China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarceona 9Spain School of Material Science and Engineering Herbert Gleiter Institute of NanoscienceNanjing University of Science and Technology.Nanjing 210094China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Northwestern Polytechnical UniversityXi'an 710072China

Relaxation dynamics,essential for the structural evolution of non-equilibrium systems like glassy materials,remain ***,we explore relaxation dynamics and viscoelastic properties in three types of metallic glasses with distinctβrelaxation *** systems with significantβrelaxation,stress relaxation and creep experiments reveal a transition from two-step to one-step relaxation with rising ***,such a phenomenon is absent in systems with weakerβ*** model the two-step relaxation process using a double Kohlrausch-Williams-Watts equation,and the obtained relaxation times elegantly adhere to the Arrhenius *** combining fitted activation energies with theoretical analysis,we conclusively attribute these relaxation processes toβrelaxation andαrelaxation,***,we analyze the relaxation time spectra of two processes and establish a comprehensive picture linking dynamic relaxation with *** study provides new strategies for probing the complex relaxation behaviors of glasses from the perspective of viscoelasticity.

关键词： creep relaxation glasses

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