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A New C++ Programming Strategy for Three-Dimensional Sphere Discontinuous Deformation Analysis

International Journal of Geomechanics 2020年第10期20卷

作者： Huang, Gang-Hai Xu, Yuan-Zhen Chen, Xiao-Feng Xia, Ming Zhang, Shu Yi, Xiong-Wei Hunan Prov. Key Laboratory of Geotechnical Engineering for Stability Control and Health Monitoring School of Civil Engineering Hunan Univ. of Science and Technology Xiangtan411201 China College of Civil Engineering and Mechanics Xiangtan Univ. Xiangtan411105 China School of Resources and Safety Engineering Central South Univ. Changsha410082 China School of Resource and Environment and Safety Engineering Hunan Univ. of Science and Technology Xiangtan411201 China

A new C++ programming strategy with high modularization and good portability, and a novel data storage format for simultaneous equations with little computer memory consumption, no sorting operation, and simple addressing algorithm are proposed for the three-dimensional sphere discontinuous deformation analysis (3D SDDA) to overcome the shortcomings of existing computation programs. An object-oriented data structure for the 3D SDDA computing code that is highly modular and easily transplanted is designed. Then, to demonstrate the portability of the 3D SDDA computing code, two computation architectures are respectively constructed to form two independent computation programs for 3D SDDA. Finally, several benchmark tests are conducted to verify the correctness of the 3D SDDA model in the new computation program, and a 170,725-sphere landslide example is simulated on a desktop computer to demonstrate the capability of the new computation program in large-scale engineering applications. Comparison between the new and existing computation programs regarding computer memory and time consumed demonstrates the great advantages brought about by the new computation program. © 2020 American Society of Civil Engineers.

关键词： C++ (programming language)

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Non-Gaussian Features of Local Wind Pressure for Typical Gable Roof of Low-rise Building

Non-Gaussian Features of Local Wind Pressure for Typical Gab...

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2019 International Conference on Informatics, control and Robotics 2019信息学、控制和机器人学国际会议(ICICR2019)

作者： Yang-jin YUAN Yi-min DAI Shu JIANG Chi-yu LI Key Laboratory of Wind-resistance and Vibration Control(Hunan Provincial) College of Civil Engineering Hunan University of Science and Technology

The non-Gaussian characteristics of local wind pressure of typical gable roof of low-rise building with a slop angle of 18.4° were monitored by means of the wind tunnel test under terrain roughness regimes of A,B and C. The probability density distribution features of wind pressure coefficient series are investigated, the characteristics of non-Gaussian zones distribution of wind pressure relative to different wind angles and different terrain conditions are analyzed and the relationships between non-Gaussian pressure and distinctions of flow field on roof are discussed. The studying results indicate that GEV distribution and Gamma distribution fit the probability density distribution of wind pressure coefficient better than Gaussian distribution and Lognormal distribution, but the fitting effect for long trailing tail part is undesirable, when skewness and kurtosis are large in magnitude(absolute value). The variation of terrain roughness and wind directions have significant influence on the distribution of non-Gaussian pressure regions on low-rise building roof. Under the oblique wind direction, the Gaussian pressure zone is divided into three sections along the approaching wind direction, along which the areas move with the change of terrain roughness regimes. The non-Gaussian features of wind pressure is positively related to mutual correlation coefficient of it's time-history.

关键词： Low-rise building Wind tunnel test Non-gaussian Correlation Skewness Kurtosis

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Numerical Simulation Analysis of Wind Interference Effects on Low-rise Gable Roof Buildings

Numerical Simulation Analysis of Wind Interference Effects o...

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2019 International Conference on Energy, Environmental and Civil engineering(EECE 2019)

作者： Yi-min DAI Yang-jin YUAN Shu JIANG Chi-yu LI Kui GUO Key Laboratory of Wind-resistance and Vibration Control (Hunan Provincial) College of Civil Engineering Hunan University of Science and Technology

A RNG k-e model,the Reynolds Averaged Navier-Stokes Equations(RANS) turbulence model, was added in software Fluent 6.3 to simulate the wind tunnel model of Tokyo Polytechnic University and the simulating results were compared to the wind tunnel test data. Then a detailed parametric study is performed for average pressure coefficient of two low-rise gable roof buildings in the same shape which only change the angle of the downstream building. The results show that the mean wind pressure coefficient of upstream building is hardly affected by the angle changing of the downstream building when the distance between buildings is larger than twice of building's width, while the downstream building is affected relatively large especially at the corner area of ridge at small angles.

关键词： Low-rise buildings Interference effect Numerical simulation Gable roof

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Research progress of supercritical water oxidation technology for oily sludge treatment

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IOP Conference Series: Earth and Environmental science 2021年第4期804卷

作者： Tianle Liu Tao Yu Guoning Gao Xuan Sun Faguo Chong Xiaofei Zhang Chengtun Qu College of Chemistry and Chemical Engineering Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields Xi'an Shiyou University Xi'an China Xi 'an Changqing Science and Technology Engineering Co. LTD China State Key Laboratory of Petroleum Pollution Control CNPC Research Institute of Safety and Environmental Technology Beijing China

Supercritical water oxidation (SCWO) technology is efficient and offers significant development potential for hazardous waste treatment. The use of water in a supercritical state with special physical and chemical properties for refractory organic matter processing offers significant advantages. This article summarizes (i) the mechanism of SCWO technology and its research progress for oily sludge treatment; (ii) the effects of reaction temperature, pressure, residence time, oxygen ratio, catalyst, antioxidant, and other factors on oily sludge treatment; and (iii) problems in the current process. Finally, SCWO technology for the future development of oily sludge treatment is discussed.

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Fullerene-Hybridized Fused-Ring Electron Acceptor with High Dielectric Constant and Isotropic Charge Transport for Organic Solar Cells

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Angewandte Chemie 2024年第6期137卷

作者： Haisheng Fang Qiaomei Chen Yi Lin Xinjie Xu Jiali Wang Mengdi Li Chengyi Xiao Christopher R. McNeill Zheng Tang Zhou Lu Weiwei Li Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites Beijing University of Chemical Technology Beijing 100029 P. R. China Center for Advanced Low-dimension Materials College of Materials Science and Engineering Donghua University Shanghai 201620 P. R. China Anhui Key Laboratory for Control and Applications of Optoelectronic Information Materials School of Physics and Electronic Information the Key Laboratory of Functional Molecular Solids Ministry of Education Anhui Normal University Wuhu 241002 P. R. China Institute of Applied Chemistry Jiangxi Academy of Sciences Nanchang 330096 P. R. China Department of Materials Science and Engineering Monash University Wellington Road Clayton Victoria 3800 Australia

A novel isotropic fullerene-hybridized fused-ring electron acceptor, designated C 60 -Y, has been synthesized via a mild [4+2] Diels–Alder cycloaddition reaction with fullerene C 60 to enhance the performance of organic solar cells (OSCs). Comparative analysis shows that C 60 -Y significantly outperforms the control acceptor Me−Y, with a notable increase in the relative dielectric constant from 2.79 to 3.95. This improvement enhances exciton dissociation and reduces non-radiative energy losses. Additionally, the isotropic molecular packing of C 60 -Y, similar to fullerene, facilitates efficient interface formation with donor polymers and improves charge mobility. As a result, incorporating C 60 -Y as an electron acceptor increases the power conversion efficiency (PCE) of binary OSCs to 15.02 %, surpassing the 13.31 % achieved with Me−Y. Moreover, when integrated into a ternary blend system, an impressive PCE of 19.22 % is achieved, top-performing among reported ternary OSCs utilizing fullerene derivatives as the third component. These results suggest that fullerene-hybridized acceptors like C 60 -Y hold great potential for advancing high-efficiency OSCs by enhancing exciton dissociation, reducing energy losses, and improving charge mobility.

关键词： fullerene non-fullerene electron acceptor dielectric constant isotropic charge transport

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Experimental Study on Wind Load Characteristics Caused by Wind Damage in Vulnerable Areas of Low-rise Building Roofs

Experimental Study on Wind Load Characteristics Caused by Wi...

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作者： Shu JIANG Yi-min DAI Yang-jin YUAN Si-ji SONG Key Laboratory of Wind-resistance and Vibration Control（Hunan Provincial） College of Civil Engineering Hunan University of Science and Technology

Through the wind tunnel test on the opening of different locations and local areas in vulnerable areas of low-rise building roofs, the distribution characteristics of wind pressure inside and outside the roof caused by roof damage. The results show that the influence of the wind direction angle on the internal pressure caused by the wind is obvious, and the internal pressure caused by the opening on the leeward surface is small and the change law is obviously different from that on the windward surface. The correlation coefficient on the inner side of the roof opening is higher than that on the side of the unopened roof, and the correlation between wind pressure on the measurement points near the opening is larger than other regions.

关键词： Low-rise buildings Roof openings Wind tunnel tests Wind-induced internal pressure

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Hydrogenation of Pyrolysis Oil from Loblolly Pine Residue

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Paper And Biomaterials 2020年第1期5卷 1-13页

作者： Ajoy Kanti Mondal Chengrong Qin Arthur JRagauskas Yonghao Ni Fang Huang College of Material Engineering Fujian Agriculture and Forestry UniversityFuzhouFujian Province350108China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control NanningGuangxi Zhuang Autonomous Region530004China Department of Forestry Wildlifeand FisheriesCenter for Renewable CarbonUniversity of Tennessee Institute of AgricultureKnoxvilleTennessee37996USA Joint Institute for Biological Science Biosciences DivisionOak Ridge National LaboratoryOak RidgeTennessee37831USA Department of Chemical Engineering University of New BrunswickFrederictonE3B 5A3Canada Institute of Fuel Research and Development Bangladesh Council of Scientific and Industrial ResearchDhaka-1205Bangladesh

Loblolly pine residue prepared with and without zeolite ZSM-5 was pyrolyzed at 600℃ and the pyrolysis oil was hydrogenated using formic acid as a hydrogen source, in the presence of a Ru/activated carbon catalyst. As indicated by the pyrolysis yield, addition of the zeolite ZSM-5 increased the yield of light oil but decreased the yield of heavy oil. The pyrolysis oils were analyzed by 13C-,31P-,19F-nuclear magnetic resonance(NMR), and heteronuclear single quantum coherence or heteronuclear single quantum correlation nuclear magnetic resonance(HSQC-NMR), demonstrating that the zeolite ZSM-5 can efficiently induce decarboxylation reactions and decrease the content of aliphatic hydroxyl groups in the heavy oil by 57%.After hydrogenation of the pyrolysis oil, the aromatic carbon content decreased by 78%, with a significant increase in the aliphatic carbon content.

关键词： hydrogenation pyrolysis oil Loblolly pine residue zeolite ZSM-5

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Microbial community with the ability to biodegradation perchlorate in a bio-electrochemical reactor 4

Microbial community with the ability to biodegradation perch...

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2019 4th International Conference on Advances in Energy and Environment Research, ICAEER 2019

作者： Zhong, Yu He, Li Fu, Guangyi Xu, Youze Xie, Lixia Cheng, Yingxiang Zhao, Yuanyuan Qiu, Yaqun Xiang, Renjun Gao, Xian Hunan Research Academy of Environmental Science Hunan Provincial Key Laboratory of Water Pollution Control Technology Changsha410004 China College of Environmental Science and Engineering Hunan University Changsha410082 China College of Life Sciences and Chemistry Hunan University of Technology Zhuzhou412007 China Hunan Research Academy of Environmental Science Technology Consulting Co. Ltd Changsha410004 China

In this study, the sediments from the Liuyang River (Hunan Province, China) were used as an inoculum to bio-reduction perchlorate in a bio-electrochemical reactor (BER). The efficient degradation of perchlorate was found in the BER by utilizing the hydrogen as electron donor. When the current intensity was 10 mA and HRT was 72 h, the removal rate of perchlorate (initial concentration was 5 mg/L) reached 84.13% and a removal flux of 178.68 mg/m2·d was achieved. High-throughput sequencing analysis confirmed that the biofilm in the reactor had been successfully acclimated, and the system could achieve perchlorate reduction effectively. Firmicutes and Bacteroidetes were the dominant phyla during inoculation phase, and Actinobacteriria, Proteobacteria, and Tenericutes also constituted a low proportion in the biofilm. Bacilli and Clostridia were dominant at class-level both in inoculum and biofilm, with the relative abundance about 56%-72% and 17%-23%, respectively. These results confirmed that the biofilm in the BER system had been successfully formed, and the BER system could biodegradation perchlorate effectively. © The Authors, published by EDP sciences, 2019.

关键词： Biofilms

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Research on control Strategy of MMC-MTDC System based on Improved Droop control

Research on Control Strategy of MMC-MTDC System based on Imp...

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2018计算机科学与工程技术国际研讨会

作者： Mingguang Zhang Jingjing Ding Yun Cai Heng Wang College of Electrical and Information Engineering Lanzhou University of Technology Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou University of Technology National Demonstration Center for Experimental Electrical and Control Engineering Education Lanzhou University of Technology

Voltage droop control is a common control strategy for multi-terminal HVDC transmission systems, while the traditional voltage droop control strategy has problems, such as large DC voltage fluctuations and unbalanced power distribution. To maintain the voltage stability of MMC-MTDC system and the power balance between the converter stations, an improved droop control strategy is proposed in this paper. The droop coefficient is designed by comparing the measured value of the multi-terminal direct-current voltage with the reference value of voltage. The fourterminal MMC-MTDC simulation model is built in PSCAD/EMTDC, and the proposed control strategy is simulated and verified under both transient and steady state conditions. The results show that the proposed control strategy can reduce the DC voltage deviation of MMC-MTDC system and improve the reliability and stability of the system. The correctness and effectiveness of the proposed method are verified.

关键词： EMTDC PSCAD MMC Research on control Strategy of MMC-MTDC System based on Improved Droop control

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Realization of Stage Batten Synchronous control Using a Fuzzy Adaptive PID Algorithm

Realization of Stage Batten Synchronous Control Using a Fuzz...

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作者： Wang Wenyan Huang Rui College of Electrical and Information Engineering Lanzhou University of Technology National Demonstration Center for Experimental Electrical and Control Engineering Education Lanzhou University of Technology Key Laboratory of Gansu Advanced Control for Industrial Processes Lanzhou University of Technology

A fuzzy adaptive PID algorithm is proposed because the parameter of conventional PID synchronous control can hardly adapt to a batten speed control *** accordance with this algorithm,a fuzzy adaptive PID synchronous controller is *** develop synchronous control programs in the upper and lower computer levels by independently utilizing hardware and software ***,we apply these programs to control the speed of two battens *** results indicate that the fuzzy adaptive PID synchronous control algorithm can achieve ideal synchronization operation when the loads on the battens are changed.

关键词： stage batten fuzzy adaptive PID synchronous control

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