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Construction of a Porous Pyrite Cinder-Supported Mn-Doped Bifeo 3 Composite Photocatalyst: Confined-Space Strategy, Structure, And Visible-Light Catalytic Degradation Toward Ciprofloxacin

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SSRN 2023年

作者： Liu, Lihua Pan, Weimin Liu, Yuzhi Xu, Shijie Zhou, Jinxun Tang, Anping Xue, Jianrong School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan411201 China Key Laboratory of Theoretical Organic Chemistry and Function Molecule Ministry of Education Xiangtan411201 China Hunan Province Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers Xiangtan411201 China Hunan Province College Key Laboratory of Molecular Design and Green Chemistry Xiangtan411201 China

A series of novel confined visible-light catalysts, namely, Mn-doped BiFeO3 (MBFO) composite photocatalyst supported on porous residue pyrite cinder (PR-PyC) after partial Fe extraction (PR-PyC/MBFO-φ, φ refers to the doped amount of Mn), was successfully constructed via confined-space strategy using the Fe-containing solution extracted from PyC as Fe source for BiFeO3 (BFO) and the PR-PyC as the template and structure regulator for MBFO generation. The obtained product, PR-PyC/MBFO-5%, consists of relatively uniform nanoparticles anchored in the channels of PR-PyC matrix and interparticle interstices and has a specific surface area of 14.1835 m2/g, an average pore size of 37.7610 nm, and a pore volume 0.1339 cm3/g. It has a type-Ⅱ heterojunction with a band gap energy (Eg) of 1.95 eV and exhibits high visible-light catalytic degradation activity toward ciprofloxacin (CIP) and excellent recyclability. The CIP degradation rate of PR-PyC/MBFO-5% reached 96.41% with an apparent reaction rate constant kapp of 0.0265 min−1 under visible-light irradiation for 120 min, and the corresponding mineralization rate reached 77.42%. The active species produced during photocatalysis were h+ and •OH, in which h+ plays a major role. The doping of 5% Mn can effectively regulate the energy band structure and heterojunction type and the use of an appropriate amount of PR-PyC can effectively guide and regulate the structure and morphology of the as-prepared catalyst. This work provides an efficient confined-space strategy for the construction of novel high-efficiency photocatalysts for antibiotic degradation and opens up a new avenue for the high-value resource utilization of PyC. © 2023, The Authors. All rights reserved.

关键词： Reusability

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Field measurements for calibration of simplified models of the stiffening effect of infill masonry walls in high-rise RC framed and shear-wall buildings

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Earthquake Engineering and Engineering Vibration 2020年第1期19卷 87-104页

作者： Zhou Yun Pei Yilin Zhou Yi Hyeon-Jong Hwang Yi Weijian College of Civil Engineering Hunan UniversityChangsha 410082China Hunan Provincial Key Lab on Damage Diagnosis for Engineering Structures Hunan UniversityChangsha 410082China Key Laboratory for Green&Advanced Civil Engineering Materials and Application Technology of Hunan Province Hunan UniversityChangsha 410082China

As a type of nonstructural component, infill walls play a significant role in the seismic behavior of high-rise buildings. However, the stiffness of the infill wall is generally either ignored or considered by simplified empirical criteria that lead to a period shortening. The difference can be greatly decreased by using a structural identification methodology. In this study, an ambient vibration test was performed on four on-site reinforced concrete high-rise buildings, and the design results were compared with the PKPM models using corresponding finite element(FE) models. A diagonal strut model was used to simulate the behavior of the infill wall, and the identified modal parameters measured from the on-site test were employed to calibrate the parameters of the diagonal strut in the FE models. The SAP2000 models with calibrated elastic modulus were used to evaluate the seismic response in the elastic state. Based on the load-displacement relationship of the infill wall, nonlinear dynamic analysis models were built in PERFORM-3 D and calibrated using the measured modal periods. The analysis results revealed that the structural performance under small/large earthquake records were both strengthened by infill walls, and the contribution of infill walls should be considered for better accuracy in the design process.

关键词： high-rise building ambient vibration test model calibration infi ll wall seismic performance nonlinear dynamic analysis

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Using Load Transient Waveform to Analyze Fault Propagation Mechanism in DC-DC Switching Power Supply

Using Load Transient Waveform to Analyze Fault Propagation M...

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Progress in Electromagnetic Research Symposium (PIERS)

作者： Junliang Wan Pengfei Yu Qiang-Ming Cai Xin Cao Longjian Zhou Haoran Li Yuyu Zhu Jun Fan School of Information Engineering Southwest University of Science and Technology Mianyang China Laboratory of Science and Technology on Reliability Physics and Application of Electronic Component Guangzhou China Robot Technology Used for Special Environment Key Laboratory of Sichuan Province Mianyang China Tianfu Institute of Research and Innovation Southwest University of Science and Technology (SWUST-TIRI) China

ISBN: (数字)9798350375909

ISBN: (纸本)9798350375916

The degradation of certain components within DC-DC power supplies can lead to abnormal performance, resulting in the occurrence of faults. The degradation of components can cause changes in output voltage and current, and the different degradation characteristics of components have different impacts on the characteristics of output parameters. Therefore, it is necessary to master this impact relationship, that is, the fault propagation mechanism can be used to effectively diagnose faults and manage health. Studying the fault propagated mechanism is an important prerequisite for fault diagnosis. Output terminals of DC-DC power supply are usually connected in parallel with electrolytic capacitors. The function of electrolytic capacitors is to filter, filtering out most of the AC part of the output voltage, and reducing the ripple of the output voltage. Electrolytic capacitors are the most vulnerable components to failure in switching power supplies, with approximate 60% of failed components being electrolytic capacitors. Therefore, the fault propagation mechanism of electrolytic capacitors is a key research topic. Most research focuses on the fault propagation mechanism based on steady-state output signals. This article studies the fault propagation mechanism based on transient output signals. Through experimental testing, the impact of parameter degradation of electrolytic capacitors on the transient waveform of output voltage and the mapping relationship between capacitor degraded parameters and transient waveform are studied. The method is to analyze the voltage waveform when the current step changes using equivalent degradated experiments of capacitors. Its advantage lies in the fact that transient waveforms are more sensitive than steady-state waveforms and require lower sampling rates, making it easier to analyze the degradated characteristics of electrolytic capacitors. For power supplies with simple structures, data is collected through simulation. For commerc

关键词： Degradation Resistance Power supplies Capacitors Voltage Switches Capacitance

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Insight into Synergistic Effect of Zinc Oxide/Expanded Vermiculite Composite (Zno/Evmt) on Bitumen: From laboratory Performance of Bituminous Mixture Under Different Aging Conditions

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SSRN 2024年

作者： Duan, Haihui Zhang, Henglong Lv, Songtao Lu, Weiwei Ge, Dongdong Jiang, Ruiyao Wang, Jinping School of Traffic and Transportation Engineering Changsha University of Science & Technology Hunan Changsha410114 China Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China National Engineering Research Center of Highway Maintenance Technology Changsha University of Science & Technology Hunan Changsha410114 China Changsha University of Science & Technology Hunan Changsha410114 China

It has been confirmed that ZnO/EVMT with synergistic effect can comprehensively retard thermal-oxidative and photo-oxidative aging behavior of bitumen. However, the synergistic effect of ZnO/EVMT on road and mechanical performance of bituminous mixture under different aging conditions is unknown, blocking the application and promotion of ZnO/EVMT. In the study, the synergistic effect of ZnO/EVMT on bitumen from bituminous mixture perspective was revealed, with the ultraviolet absorber (UVA) compounding with antioxidant (AO) (label as UVA+AO, the same component ratio as ZnO/EVMT) and hydrated lime (HL) modifier serving as controls. The influence of ZnO/EVMT on the laboratory performance, including road performance (high-temperature and low-temperature properties, water stability and fatigue property) and mechanical properties (dynamic modulus and its master curve, uniaxial compression creep), of bituminous mixtures under four different aging conditions (unaged, long-term oven aging, long-term continuous photo-oxidative aging and long-term all-weather photo-oxidative aging conditions) were investigated. Results show that under unaged condition, the addition of ZnO/EVMT with synergistic effect can enhance road performance of bituminous mixture. The positive effects on bituminous mixture are similar to that of HL modifier and more than of UVA+AO modifier. Under long-term oven aging condition, bituminous mixture containing ZnO/EVMT with synergistic effect and HL have similar deformation resistance. Moreover, adding ZnO/EVMT and the other two modifiers can enhance the low-temperature property, water stability and fatigue property of bituminous mixture, and ZnO/EVMT modified bituminous mixture has the highest low-temperature property. Moreover, ZnO/EVMT modified bituminous mixture has the lowest property change sensitivity due to its synergistic effect on thermal-oxidative aging of bitumen. At two long-term photo-oxidative aging conditions, ZnO/EVMT modified bituminous mix

关键词： Zinc oxide

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Research on the Properties and Mechanism of Graphene/nano-TiO2 Composite Modified Asphalt

Research on the Properties and Mechanism of Graphene/nano-Ti...

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2022世界交通运输大会(WTC2022)

作者： Wang Min Shi Kaixin Yan Kezhen Shi Junyi Hong Zhe College of Civil Engineering Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan ProvinceKey Laboratory of Building Safety and Energy Efficiency of the Ministry of EducationHunan University

In this paper,graphene was used to improve the dispersion of nano-TiOin asphalt by preparing graphene and nano-TiOcomposite modified asphalt with different *** properties of nano-TiOand graphene composite modified asphalt before and after short-term and long-term aging were analyzed by dynamic shear rheometer（DSR）and bending beam rheometer（BBR）*** mechanism of nano-TiOand graphene composite modified asphalt was studied by particle sizer and scanning electron microscopy（SEM）.The results indicated that the incorporation of graphene and nano-TiOincreased the elastic properties and the deformation resistance of asphalt at high temperature,and the graphene and nano-TiOcould improve the short-term and long-term aging resistance of *** low temperature,the short-term and long-term aging resistance was improved by compounding graphene and nano-TiOwith asphalt to some *** optimum composite dosage is 1%nano-TiOand 0.04%graphene for improving the properties of *** dispersion of nano-TiOwas improved effectively by incorporating graphene,and adding graphene into asphalt could reduce the agglomeration of nano-TiOin asphalt.

关键词： Graphene Nano-TiO2 Composite modified asphalt Properties Mechanism

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Research on Fast Adaptive Transmission Models for International Inland Port Based on Edge Intelligence

Research on Fast Adaptive Transmission Models for Internatio...

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IEEE International Conference on Cyber Security and Cloud Computing (CSCloud)

作者： Liu Yiwen Zhu Zhirong Tangyan Wen Wenkan Peng Xiaoning Shi Yuanquan School of Computer and Artificial Intelligence Huaihua University Huaihua Hunan P. R. China Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing Application in Hunan Province Universities Huaihua Hunan P. R. China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua Hunan P. R. China

In this paper, we propose a logistics International Inland Port resource allocation method based on intelligent edge scheduling, and we do a reasonable pre-allocation of logistics resources by building an edge network in the urban system. By using multiple integrated learning models and regional prevalence classification algorithms, the distribution demand of each sub-distribution point is predicted. The proposed method is able to cope with uncertainties such as high distribution volume, variable distribution situations or long transportation distances. We use the HuaiHua International Inland Port as the simulation object, and the simulation results show that the proposed method has the highest efficiency in logistics distribution and is still highly adaptive in emergency situations.

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Cha-Based Self-Ratiometric Gel Electrophoresis Detection Platform for Reliable Nucleic Acid Analysis

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SSRN 2023年

作者： Qi, Fang-Yuan Zhang, Chong-Hua Qiao, Lei Zhang, Ding Liu, Xianjun Peng, Lan Yang, Yu Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Province College Key Laboratory of QSAR/QSPR Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers School of Chemistry and Chemical Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China Xuzhou Medical University China

The development of gel electrophoresis-based biodetection assays for point-of-care analysis has been limited by their reliability and reproducibility due to many interfering factors. In this work, we proposed a ratiometric gel electrophoresis-based biosensing platform by employing CHA process function as both signal output and signal amplification module. The self-ratiometric biosensor had the advantages in miniaturized instruments, simple operation and high reproducibility. Moreover, dual isothermal amplifications for nucleic acid enable improved sensitivity with less cost. Two types of nucleic acids DNA and miRNA are chosen for demonstration. The developed strategy reaches a detection limit of 130 fM for HBV and 150 fM for miRNA , respectively. More interestingly, this developed assay also has the potential to enable rapid point-of-care detection by introducing smartphone camera for imaging. In virtue of these advantages, the proposed ratiometric gel electrophoresis strategy indeed provides a new paradigm for the design of portable detection platform and might hold great potential for sensitive diagnosis. © 2023, The Authors. All rights reserved.

关键词： Reliability analysis

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Design and Dynamic Simulation of Single-arm Inspection robot System for Transmission Lines

Design and Dynamic Simulation of Single-arm Inspection Robot...

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International Conference on Advanced robotics and Mechatronics (ICARM)

作者： Dehua Zou Lanlan Liu Zhipeng Jiang Bangwei Luo Wusheng Quan Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (ROBOT) (State Grid Hunan Ultra-High Voltage Transmission Company) and Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory(State Grid Hunan Ultra-High Voltage Transmission Company) Changsha China

Overhead transmission line energized maintenance is a necessary means to maintain the safe and stable operation of electric power, common energized operation tasks require manual tower operation, and inspection robots are gradually becoming a powerful tool as an alternative or auxiliary manual energized operation, but conventional inspection robots have problems such as difficulty in getting on and off the line, single operation function, weak intelligent behavior, etc. Therefore, this paper proposes a new method of intelligent cooperative operation between a large-load UAV and a power inspection robot, a transmission line single-arm inspection robot mechanical system has been designed, the Lagrangian method has been used to model and analyze, and the theoretical model basis for the drive selection of the robot arm joint has been established. On this basis, a virtual prototype model is established in ADMAS software, and the dynamics characteristics have been simulated and analyzed. Finally, an online operation experiment was carried out on the actual live line, the results show that the single-arm inspection robot mechanism designed in this paper meets the requirements of conventional live line operation inspection, it is easy to control and can be precisely positioned. The research in this paper can solve the bottleneck problem of robot practicality, which has important theoretical significance and practical application value for the safety, stability, and intelligent operation and maintenance management of power transmission lines.

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Phase Engineering of Alkali-Activated Materials: A Case of Shrinkage Mitigation Via Cldh Seeding

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SSRN 2023年

作者： Zhou, Zhengning Zhang, Zuhua Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University 410082 China Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education School of Materials Science and Engineering Tongji University Shanghai201804 China

In this research, we proposed the conception and methodology of phase engineering for alkali-activated materials (AAMs). As a case, we showed the efficiency of adopting calcined layered double hydroxides (CLDHs) as hydration seeds to solve the technical problem of high autogenous shrinkage and drying shrinkage of alkali-activated slag (AAS). We examined the effects of two types of CLDHs in Ms=0.6 and 1.0 of activator activated slag binders, and found the maximum autogenous shrinkage and drying shrinkage of AAS mortar containing 6% CLDH were only 348μm/mm and 473μm/mm, reduced by 70% and 45% respectively. Low modulus activation (here it is Ms=0.6) was a more favorable conditions for seeding and generation of crystalline hydrotalcite. From the inspiring results, the phase engineering (via CLDH seeding here) is a fundamental method to design and control the properties of AAMs as it can change the crystal/gel ratio and microstructure of amorphous gel. © 2023, The Authors. All rights reserved.

关键词： Microstructure

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Research on Multi-objective Coordination Strategies for Active Distribution Networks Based on Dynamic Energy Storage Management

Research on Multi-objective Coordination Strategies for Acti...

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Clean Energy and Electric Power Engineering (ICCEPE), International Conference on

作者： Huaping Yin Yeqin Ma Mouhai Liu Jiale Li State Grid Hunan Electric Power Limited Company Changsha China Hunan Province Key Laboratory of Intelligent Electrical Measurement and Application Technology (Power Supply Service Center (Metrology Center) State Grid Hunan Electric Power Limited Company Changsha China School of Electrical & Information Engineering Changsha University of Science & Technology Changsha China

ISBN: (数字)9798350390315

ISBN: (纸本)9798350390322

Aimed at the challenges posed by the increasing penetration of renewable energy sources (RES) in active distribution networks, particularly concerning local consumption and transmission barriers of harvested RES, this study investigates a coordination control methodology between distributed energy storage systems (ESS), volatile renewable power generation systems, and highly stable large-scale grid systems under secure operational conditions. Initially, the dynamic variations in charging and discharging depths during operation are considered, leading to a dynamic modeling of the state-of-charge (SOC) for ESS batteries. On the premise of ensuring the safety of distributed ESS, a multi-objective comprehensive optimization strategy is developed to enhance RES accommodation, augment regional grid RES export capability, and maximize economic benefits. Ultimately, the feasibility and rationality of the proposed strategy are validated through simulations, which demonstrate that the approach enables different storage units to adjust their charge-discharge depths, significantly improving the capacity for integrating renewable energy.

关键词： Economics Renewable energy sources Storage management Batteries Safety Power systems Active distribution networks State of charge Resource management Power generation

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