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SSRN 2024年

作者： Chu, Rencheng Zhao, Cheng Yun, Junge Chen, Zimo Zheng, Han Zhao, Yanhong Feng, Xin Tong, Zhangfa Chen, Zhihang Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Guangdong Key Lab of Water & Air Pollution Control Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China College of Environment and Resources Xiangtan University Xiangtan China

In this paper, three Co3O4 catalysts with different morphologies (nanoparticulate, layered, and cubic) were synthesized to control the concentration of oxygen vacancies and applied to the catalytic oxidation of styrene, and the nanoparticulate Co3O4 (Co3O4-N), which has the smallest specific surface area (38.0240 m²/g), showed the best catalytic performance (T100=247 °C). Based on various characterization data, the analysis was carried out, and the results showed that the physical structural properties are not the key factor determining the catalytic activity, and more excellent chemical properties such as oxygen vacancies determine the catalytic activity. Finally, the reaction process of styrene adsorption oxidation and the degradation of key intermediates of the reaction were investigated by in situ DRIFTS technique, which demonstrated that a high concentration of oxygen vacancies can accelerate the oxidation of important intermediates, simplify the whole styrene oxidation process, and produce fewer by-products. © 2024, The Authors. All rights reserved.

关键词： Catalytic oxidation

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Tuning the photocatalytic water-splitting performance with the adjustment of diameter in an armchair WSSe nanotube

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Journal of Energy Chemistry 2021年第10期30卷 228-235,I0007页

作者： Lin Ju Penglan Liu Yifan Yang Liran Shi Gui Yang Li Sun School of Physics and Electric Engineering Anyang Normal UniversityAnyang 455000HenanChina School of Mechanical Medical and Process EngineeringQueensland University of TechnologyGardens Point CampusQLD 4001BrisbaneAustralia School of Electronic and Information Engineering Liaoning Technical UniversityHuludao 125105LiaoningChina Key Lab of Advanced Transducers and Intelligent Control System Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024ShanxiChina

Due to the enigmatical electrostatic potential difference between the inside and outside layers,the relationship between the diameter and the photocatalytic property of the Janus transition metal dichalcogenides nanotube is still *** this job,for the first time we calculate the electrostatic potential difference of the Janus WSSe armchair nanotubes with corresponding building block models through the first principles *** electrostatic potential difference increases as the diameter ***,it is observed that the WSSe armchair nanotubes with smaller diameter have stronger oxidation capacity,weaker reduction capacity,and higher solar-to-hydrogen conversion ***,the diminution of diameter could make the band gap drop,and even cause a direct-indirect transformation of band *** adjustment of diameter could also regulate the ability of adsorbing water molecules at the insider and outside ***,the suitable band edge positions,wide optical absorbance region(to the near-infrared),outstanding solar-to-hydrogen efficiency(up to 28.99%),high carrier separation,adequate photoexcited carrier driving forces,as well as the energetic and thermal stability,render these nanotubes befitting the photocata lytic water-splitting *** study not only predicts a kind of ideal water-splitting photocatalyst,but also shows an effective way to improve their photocatalytic performances.

关键词： Photocatalysis Water-splitting Janus TMD nanotube Density functional theory calculations

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V-Modified MnCo2O4.5 Spinel Catalyst for the Synergistic Removal of Nox and Vocs from Coke Oven Flue Gas: Mechanism and Performance Study

SSRN

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SSRN 2024年

作者： Chen, Zimo Zhao, Cheng Yun, Junge Chu, Rencheng Zheng, Han Feng, Xin Tong, Zhangfa Chen, Zhihang Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology School of Chemistry and Chemical Engineering Guangxi University Nanning530004 China Guangdong Key Lab of Water & Air Pollution Control Guangdong Province Engineering Laboratory for Air Pollution Control South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China College of Environment and Resources Xiangtan University Xiangtan China

A dual-function catalyst, designated as V0.5Mn5Co5, has been constructed for the synergistic removal of NOx and volatile organic compounds under coke-oven flue gas conditions. The V0.5Mn5Co5 catalyst has more than 95% NOx conversion at 180-300 °C and removes 70% of ethylene at 240 °C. Besides it has excellent sulfur resistance. The catalyst satisfies the requirements of the procedure for denitrifying coking flue gas. Vanadium (V) prevents the transition dehydrogenation and oxidation of NH3 by reducing the Lewis acidic sites of the catalyst and thus inhibiting the generation of surface reactive oxygen species. NOx removal was enhanced by increasing its Brønsted acid sites. Mechanistic studies showed that the catalysts mainly perform SCR reaction through E-R mechanism, and N2O is generated through the transition dehydrogenation of NH3 and NSCR reaction. Ethylene(C2H4) oxidation followed the MvK mechanism, and there was a competitive adsorption of NH3 with C2H4, and there was a mutual inhibition between the SCR reaction and the ethylene oxidation reaction. Commercial medium and low temperature SCR catalysts are almost ineffective in the oxidation of VOCs in coking flue gas, but V0.5Mn5Co5 exhibits excellent synergistic removal of NOx and VOCs in coke oven flue gas, which indicating great promise for industrial application. © 2024, The Authors. All rights reserved.

关键词： Nitrogen oxides

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One Pot Facile Visible-Light Promoted Synthesis of Quinazolinones Via Csp3-H Oxidation in Aqueous Media

SSRN

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SSRN 2023年

作者： Chen, Taiping Yang, Huan Li, Shuangjun Xie, Jiangping Wei, Lingyu Yang, Li Key Lab of Process Analysis and Control of Sichuan Universities Yibin University Sichuan Yibin644000 China Party Working Committee of Yibin Campus Xihua University Sichuan Yibin644000 China College of Science Xihua University Sichuan Chengdu610039 China

The utilization of biocompatible catalysts for the synthesis of biologically significant molecules in aqueous environments represents a pivotal and challenging aspect within the realm of green and sustainable chemistry. Herein, a KI-mediated Csp3-H oxidation reaction to synthesis heterogeneously of quinazolinones is reported in this study. Alcohol-oxidized aldehydes attack amides and cyclize to obtain various quinazolinones efficiently only under sunlight, in aqueous media. The utilization of solar energy significantly reduces experimental costs and minimizes the occurrence of toxic effects. This approach proceeded smoothly to afford quniazolinones in high to excellent yields with a wide substrate scope © 2023, The Authors. All rights reserved.

关键词： Synthesis (chemical)

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Apple microbial communities and differences between two main Chinese producing regions

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Food Quality and Safety 2022年第1期6卷 34-44页

作者： Youming Shen Jianyi Zhang Jiyun Nie Hui Zhang Syed Asim Shah Bacha College of Horticulture Qingdao Agricultural University/Laboratory of Quality&Safety Risk Assessment for Fruit(Qingdao)Ministry of Agriculture and Rural Affairs/National Technology Centre for Whole Process Quality Control of FSEN Horticultural Products(Qingdao)/Qingdao Key Lab of Modern Agriculture Quality and Safety EngineeringQingdaoChina Institute of Pomology Chinese Academy of Agricultural Sciences/Laboratory of Quality&Safety Risk Assessment for Fruit(Xingcheng)Ministry of Agriculture and Rural Affairs/Quality Inspection and Test Center for Fruit and Nursery Stocks(Xingcheng)Ministry of Agriculture and Rural AffairsXingchengChina

Microbes on fresh apples are closely associated with fruit disease,preservation,and quality *** into the microbial commu-nities on apples from different producing regions could reveal the microbial specificity and help disease prevention and quality *** this paper,the apple surface microbes of 44 samples from two main Chinese apple-producing regions,Bohai Bay(BHB)and the Loess Plateau(LP),were investigated by sequencing fungal internal transcribed spacer and bacterial 16s rRNA hypervariable *** and LP apples con-tained significantly different bacterial and fungal *** apples had a higher fungal diversity than LP apples.A total of 102 different fungal and bacterial taxonomies were obtained between apples from the two regions,in which 24 genera were *** apples had higher phytopathogenic fungal genera,such as Tilletiopsis,Acremonium,Candida,and Phoma,indicating the higher phytopathogenic risks of apples from the humid climate of the BHB *** apples contained more bacterial genera identified as gut microbes,indicating the potential risks of contaminating apples with foodborne pathogens in the arid environment of the LP This study highlighted the environment-oriented mi-crobial specificity on apples from two main apple-producing regions,and provided a basis for further investigation.

关键词： Apple regional climate microbiome metagenomics next generation sequencing

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An Intelligent Fatigue Life Prediction Method for Aluminum Welded Joints Based on Fatigue Characteristics Domain

An Intelligent Fatigue Life Prediction Method for Aluminum W...

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作者： Zou, Li Li, Hongxin Jiang, Wei Software Institute Dalian Jiaotong University Dalian116002 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China

In order to reduce the dispersion level of fatigue test samples of aluminum alloy welded joints and further improve the fatigue life prediction accuracy, the concept of fatigue characteristic domain is proposed. Based on the attribute reduction of neighborhood rough set, the division method of fatigue characteristic domain is determined. According to the attribute reduction, the key fatigue life influencing factor set of welded joint is used to divide all fatigue test samples into several sub-domain sets, and each sub-domain set corresponds to a fatigue character sub-field. Support vector machine has the characteristics of simple calculation, perfect theoretical foundation and suitable for small sample problems. Based on its characteristics, an improved support vector machine model for fatigue life prediction of aluminum alloy welded joints is established in the determined fatigue characteristics domain. The experimental results show that compared with the least squares fitting method, the support vector machine model has stronger anti-noise ability and higher prediction accuracy. © Springer Nature Singapore Pte Ltd. 2020.

关键词： Welds

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Group equivalent modeling and analysis of group subsynchronous oscillation of direct-drive wind turbine 5

Group equivalent modeling and analysis of group subsynchrono...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Dong, Xuetao Zhao, Yue Zhai, Wenchao Wang, Zhenyang Liu, Kan Yan, Gangui Electric Power Research Institute of State Grid Xinjiang Electric Power Co. Ltd. Dept. Xinjiang Electric Power System Whole Process Simulation Key Laboratory Urumqi China Northeast Electric Power University Dept. Min. of Educ. Key Lab. of Modern Power System Simulation Control and Green Power Technology Jilin China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Taking the direct drive wind farm connected to weak AC system as the research object, combined with the actual topology of a wind farm in Hami, Xinjiang, this paper establishes the detailed model and cluster aggregation model of direct drive wind farm on PSCAD / EMTDC platform, and comprehensively analyzes the effectiveness of aggregation model under sub synchronous oscillation (SSO). The results show that when SSO occurs, the cluster equivalent model can accurately reflect the output characteristics, damping characteristics and oscillation frequency of the wind farm. According to the actual topology of a wind power collection station in Hami, Xinjiang and the actual operation of a wind power collection station on a certain day, the equivalent clustering is carried out. © 2022 IEEE.

关键词： Wind power

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Study of Cracking Mechanism and Wear Resistance in Laser Cladding Coating of Ni-based Alloy

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 259-272页

作者： Zhenglei Yu Lunxiang Li Deqiang Zhang Guangfeng Shi Guang Yang Zezhou Xu Zhihui Zhang Key Lab of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130022China State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130022China College of Mechanical Engineering and Automation Liaoning University of TechnologyJinzhou 121001China Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process Shenyang Aerospace UniversityShenyang 110136China

Nickel-based alloy coatings were widely used for the remanufacturing of dies and moulds by laser cladding,but the crack sensitivity would be increase due to the higher strength and hardness,which reduced the wear resistance of Ni-based *** this paper,Ni-based coatings with the addition of a plastic phase(an austenitic stainless net)were prepared using laser cladding technology,and the CeO_(2)was added in cladding *** cracking mechanism,microhardness,microstructure,phase composition,and wear properties were *** relationship between thermal stress and the elastic and plastic fracture had been developed from the standpoint of fracture mechan-ics and thermal elastic fracture *** fracture criterion of the nickel-based coating was obtained,and the study has shown that the crack sensitivity could be reduced by decreasing the thermal expansion coefficientΔα.Thus,a new method was proposed,which the stainless steel nets were prefabricated on the *** was found that the number of cracks reduced significantly with the addition of stainless steel *** the stainless steel net with 14 mesh was added in Ni-based coatings,the average microhardness of nickel composite coating was 565 HV_(0.2),which was 2.6 times higher than that of the 45 steel *** the rare earth oxide 4 wt.%CeO_(2)and stainless steel net were added in the Ni-based coating reducing the microhardness(the average microhardness is 425 HV_(0.2)),the wear resistance of it improved *** wear volume of Ni-based composite coating was 0.56×10^(−5) mm^(3)·N^(−1)·m^(−1),which was 85.1%lower than that of 45 *** experiment results have shown that the Nickel-based composite coating is equipped with low crack sensitivity and high abrasive resistance with austenitic stainless net and the rare earth oxide 4 wt.%*** research offers an efficient solution to produce components with low crack susceptibility and high wear-resistance coatings fabricated

关键词： Laser cladding Wear resistance Crack sensitivity Stainless steel net Rare earth oxide

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Optical Tactile Sensing for Aerial Multi-Contact Interaction: Design, Integration, and Evaluation

arXiv

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arXiv 2024年

作者： Aucone, Emanuele Sferrazza, Carmelo Gregor, Manuel D'Andrea, Raffaello Mintchev, Stefano The Environmental Robotics Laboratory Dept. of Environmental Systems Science ETH Zürich Zürich8092 Switzerland Birmensdorf8903 Switzerland The Robot Learning Lab UC Berkeley BerkeleyCA94704 United States The Institute for Dynamic Systems and Control Dept. of Mechanical and Process Engineering ETH Zürich Zürich8092 Switzerland

Distributed tactile sensing for multi-force detection is crucial for various aerial robot interaction tasks. However, current contact sensing solutions on drones only exploit single end-effector sensors and cannot provide distributed multi-contact sensing. Designed to be easily mounted at the bottom of a drone, we propose an optical tactile sensor that features a large and curved soft sensing surface, a hollow structure and a new illumination system. Even when spaced only 2 cm apart, multiple contacts can be detected simultaneously using our software pipeline, which provides real-world quantities of 3D contact locations (mm) and 3D force vectors (N), with an accuracy of 1.5 mm and 0.17 N respectively. We demonstrate the sensor’s applicability and reliability onboard and in real-time with two demos related to i) the estimation of the compliance of different perches and subsequent re-alignment and landing on the stiffer one, and ii) the mapping of sparse obstacles. The implementation of our distributed tactile sensor represents a significant step towards attaining the full potential of drones as versatile robots capable of interacting with and navigating within complex environments. Copyright © 2024, The Authors. All rights reserved.

关键词： Drones

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Design and implementation of temperature and humidity monitoring system for small cold storage of fruit and vegetable based on Arduino 4

Design and implementation of temperature and humidity monito...

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2020 4th International Conference on Electrical, Mechanical and Computer Engineering, ICEMCE 2020

作者： Tang, Xiuying Tan, Chao Chen, Aibin Li, Zhenghong Shuai, Renzheng College of Mechanical and Electrical Engineering Yunnan Agricultural University Kunming China Key Lab of Process Analysis and control of Sicuan Universities Yibin University Yibin China

At present, the utilization rate of small cold storage for fruit and vegetable in Yunnan is low, and it is necessary to carry out regional management of cold storage in order to save energy and improve the utilization rate. Because different fruits and vegetables need different refrigeration temperatures, so real-time temperature and humidity monitoring is particularly important. For meeting this requirement, this paper designs an arduino-based temperature and humidity monitoring system for small cold storage of fruit and vegetable. The system mainly includes hardware and software parts. Handware component includes Arduino Mega2560, ESP8266, Zigbee, DHT11 temperature and humidity sensor, and OLED display and the software component includes the Arduino IDE, UartAssist serial debugging assistant, Lighting. Blinker. Finally, the whole system is tested, and the test results show that the system has the characteristics of remote viewing, high measuring accuracy and convenient use, and the system could meet the needs of temperature and humidity management for small cold storage. © 2020 Journal of Physics: Conference Series.

关键词： Cold storage

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