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Research on the influence of outdoor trees on natural ventilation performance of an academic building

Building Simulation 2023年第6期16卷 927-946页

作者： Shengnan Niu xiaodong Liu Annan Wang Lufang Chen xin Zhou xing Shi Liu Yang xing Jin School of Architecture Southeast UniversityNo.2 SipailouNanjing210096China College of Architecture&Urban Planning Tongji UniversityKey Laboratory of Ecology and Energy Saving Study of Dense HabitatMinistry of Education1239 Siping RoadShanghai200092China Engineering Research Center of BEEE Ministry of EducationXichengChina School of Energy and Environment Southeast UniversityNo.2 SipailouNanjing210096China

Planting trees around buildings has always been used as one of the most common viable landscaping strategies in ***,the impact of trees on natural ventilation inside the building has been neglected without *** emphasis of this study related to the impact of outdoor trees around the academic building on indoor *** simulations of the indoor wind environment of the academic building affected by trees were performed utilizing the k-εmodel with additional source *** numerical model was also validated by measured *** kinds of trees were selected,they are camphor and *** is a kind of broad-leaved tree and metasequoia is a kind of coniferous tree.26 simulation cases with six different tree canopy spacings were *** results showed that the outdoor trees had great influences on the natural ventilation performance of the academic *** with the case without the trees,the highest decrement in ventilation flow rate could be up to 31.97%in this *** the cases of classrooms with horizontal distribution,the ages of air of the classrooms became fresher with the increase of the canopy *** for the cases of classrooms with vertical distribution,the canopy spacing had fewer effects on the natural ventilation *** was also found that the blocking effects of camphor on indoor ventilation were higher than that of *** average ventilation flow rate in cases with metasequoia was increased by 14.89%compared to the cases with *** study could provide guidance for the layout design of trees around the building.

关键词： natural ventilation layout of trees academic building CFD simulation

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不同灌溉方式对槟榔生长、果实品质及产量的影响

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热带农业科学 2021年第9期41卷 1-4页

作者：降佳君张瀚李晗罗天雄辛晓栋杨福孙海南大学热带作物学院海南海口570228

节水灌溉是实现槟榔产业可持续发展的重要途径。为筛选槟榔最佳的灌溉供水模式,通过田间试验,以无灌溉为对照(CK),设树盘漫灌(T1)和滴灌(T2)2种灌溉处理,探究不同灌溉方式对槟榔树体生长、果实品质及产量的影响。结果表明:不同灌溉方式... 详细信息

节水灌溉是实现槟榔产业可持续发展的重要途径。为筛选槟榔最佳的灌溉供水模式,通过田间试验,以无灌溉为对照(CK),设树盘漫灌(T1)和滴灌(T2)2种灌溉处理,探究不同灌溉方式对槟榔树体生长、果实品质及产量的影响。结果表明:不同灌溉方式对槟榔的生长,果实品质和产量都有一定的影响;与树盘漫灌和无灌溉相比,滴灌处理下槟榔植株形态指标最佳,其中叶面积分别增加10.13%和35.94%;可溶性糖含量、纤维素含量、可溶性蛋白含量最高;此外,滴灌处理下槟榔的产量最高,结果数为233.8个/株,产量高达5866.4 kg/hm^(2),增产效果最佳。因此,相比于其他灌溉方式,滴灌更适合槟榔的生产。

关键词：槟榔灌溉方式生长品质产量

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Vertical multiple-layer structure of temperature and turbulent diffusivity in the South China Sea

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Acta Oceanologica Sinica 2022年第10期41卷 14-21页

作者： xin He Changrong Liang Yang Yang Guiying Chen xiaodong Shang Xiaozhou He Penger Tong State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China University of Chinese Academy of Sciences Beijing100049China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou511458China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou510301China Institute of Deep-Sea Science and Engineering Chinese Academy of SciencesSanya572000China School of Mechanical Engineering and Automation Harbin Institute of TechnologyShenzhen518055China Department of Physics Hong Kong University of Science and TechnologyHong Kong999077China

We report field measurements of vertical profiles of the turbulent diffusivity and temperature at different stations in the South China Sea(SCS).Our study shows that the measured turbulent diffusivity follows a power-law distribution with a varying exponent in water *** multiple-layer scaling regimes were also observed from the temperature *** turbulent diffusivity and temperature fluctuations,the vertical structure of temperature was ***,we discussed the temperature profiles in each layer.A constant function of a dimensionless temperature profile was found in water layers that have identical turbulence *** results reveal the multiple-layer structure of temperature in the *** study contributes to the understanding of the vertical structure of multiple layers in the SCS and provides clues for exploring the physical mechanism for maintaining the temperature structure.

关键词： temperature profile turbulent diffusivity South China Sea multiple layers

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Heteroatom tuning in agarose derived carbon aerogel for enhanced potassium ion multiple energy storage

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Carbon Energy 2024年第3期6卷 239-254页

作者： Kaijun Xie xin Liu Haolin Li Long Fang Kai Xia Dongjiang Yang Yihui Zou xiaodong Zhang State Key Laboratory of Bio-fibers and Eco-textiles Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological TextilesInstitute of Marine Biobased MaterialsCollege of Chemistry and Chemical EngineeringCollege of Environmental Science and EngineeringQingdao UniversityQingdaoChina

The incorporation of heteroatoms into carbon aerogels(CAs)can lead to structural distortions and changes in active sites due to their smaller size and electronegativity compared to pure ***,the evolution of the electronic structure from single-atom doping to heteroatom codoping in CAs has not yet been thoroughly investigated,and the impact of codoping on potassium ion(K+)storage and diffusion pathways as electrode material remains *** this study,experimental and theoretical simulations were conducted to demonstrate that heteroatom codoping,composed of multiple heteroatoms(O/N/B)with different properties,has the potential to improve the electrical properties and stability of CAs compared to single-atom *** states near the Fermi level have revealed that doping with O/N/B generates a greater number of active centers on adjacent carbon atoms than doping with O and O/N *** a result of synergy with enhanced wetting ability(contact angle of 9.26°)derived from amino groups and hierarchical porous structure,ON-CA has the most optimized adsorption capacity(−1.62 eV)and diffusion barrier(0.12 eV)of K^(+).The optimal pathway of K^(+)in ON-CA is along the carbon ring with N or O *** K^(+)storage material for supercapacitors and ion batteries,it shows an outstanding specific capacity and capacitance,electrochemical stability,and rate ***,the assembled symmetrical K^(+)supercapacitor demonstrates an energy density of 51.8 Wh kg^(−1),an ultrahigh power density of 443Wkg^(−1),and outstanding cycling stability(maintaining 83.3%after 10,000 cycles in 1M KPF6 organic electrolyte).This research provides valuable insights into the design of highperformance potassium ion storage materials.

关键词： agarose carbon aerogels O/N/B codoping potassium-ion battery potassium-ion supercapacitor

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Novel wreck salvaging method using curved rectangular pipe basing method:A case study of"Yangtze River EstuaryⅡ"ancient shipwreck salvage project

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Underground Space 2024年第5期18卷 97-113页

作者： Qianwei Zhuang Guofang Gong Dongrong Zhou Chi Zhang xin Huang xiaodong Zhu Weihao Yuan Deng Li School of Mechanical Engineering Zhejiang UniversityHangzhou 310030China Shanghai Tunnel Engineering Co.Ltd. Shanghai 200137China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China College of Civil Engineering and Architecture Xinjiang UniversityUrumqi 830047China Shanghai Salvage Company Shanghai 200090China

Shipwreck salvage is a risky,time-consuming,and expensive *** there are many sunken ships along coastlines and in the open seas,the salvage process of a sunken ship has rarely been *** integrated salvage of the"Yangtze River EstuaryⅡ"shipwreck used a novel method with 22 closely locked curved rectangular pipes to form a watertight base that wrapped the shipwreck *** basing was lifted out of the water using a powerful crane situated on an engineering *** the first time,the tunneling method was used in a shipwreck salvage project,significantly reducing the disturbance to the shipwreck and its stowage,thereby preserving the original state and integrity of the shipwreck to the greatest *** this study,the basic concepts of the salvage method and process are *** to critical issues in the new salvage method are provided,including jacking force prediction and major considerations for the structural design of the salvage *** design of the salvage system and salvage process of the"Yangtze River EstuaryⅡ"shipwreck are *** monitored jacking force,pipe deformation,and observed water-tightness verified that the proposed method was effective and *** possible application scenarios for the proposed method are presented at the end.

关键词： Pipe jacking Shipwreck salvage Yangtze River EstuaryⅡ Structural design

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Tailoring the microstructure and mechanical properties of the final Al-Mn foils by different intermediate annealing process

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Journal of Materials Science & Technology 2017年第9期33卷 961-970页

作者： Li Huang Guangjie Huang Yunchang xin Lingfei Cao xiaodong Wu Zhihong Jia Qilei Li Qing Liu College of Materials Science and Engineering Chongqing University

In this work, two different intermediate annealing processes, single-step annealing（SSA, 530?C/15 h）and two-step annealing（TSA, 450?C/5 h + 530?C/15 h）, were used to tailor microstructure before coldrolling and annealing of the final twin-roll cast Al-Mn foils. The recrystallization behavior and mechanical properties during annealing of severely cold-rolled foils were systematically studied. Our results show that discontinuous recrystallization occurs in SSA-foils during annealing at 150–310?C, in contrast with continuous recrystallization in TSA-foils. The continuous recrystallization develops much finer grains（;.35 μm） in the TSA-foils than those by discontinuous recrystallization in the SSA-foils（;4.7 μm）. The texture components in cold-rolled TSA-foils hardly change（retained rolling-textures） after continuous recrystallization, while those in the cold-rolled SSA-foils mainly transform into a strong cube component{001} after discontinuous recrystallization. Finally, a maximized elongation to fracture of;3.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts,;.3%. The relationships between the microstructure and mechanical properties were discussed.

关键词： Al-Mn alloys Foil Annealing Recrystallization mechanism Size effect Mechanical property

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The speciation, leachability and bioaccessibility of Cu and Zn in animal manure-derived biochar： effect of feedstock and pyrolysis temperature

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Frontiers of Environmental Science & Engineering 2017年第3期11卷 67-78页

作者： Qi Lin xin Xu Lihua, Wang Qian Chen Jing Fang xiaodong Shen Liping Lou Guangming Tian Department of Environmental Engineering Zhejiang University Hangzhou 310058 China Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province Hangzhou 310058 China Institute of Hangzhou Environmental Science Hangzhou 310014 China

Biochars derived from animal manures may accumulate potentially toxic metals and cause a potential risk to ecosystem. The synchrotron-based X-ray spectroscopy, sequential fractionation schemes, bioaccessibility extraction and leaching procedure were performed on poultry and swine manure-derived biochars （denoted PB and SB, respectively） to evaluate the variance of speciation and activity of Cu and Zn as affected by the feedstock and pyrolysis temperature. The results showed that Cu speciation was dependent on the feedstock with Cu-citrate-like in swine manure and species resembling Cu-glutathione and CuO in poultry manure. Pyrolyzed products, however, had similar Cu speciation mainly with species resembling Cu-citrate, CuO and CuS/Cu2S. Organic bound Zn and Zn3（PO4）2-1ike species were dominant in both feedstock and biochars. Both Cu and Zn leaching with synthetic precipitation leaching procedure （SPLP） and toxicity characteristic leaching procedure （TCLP） decreased greatly with the rise of pyrolysis temperature, which were consistent with the sequential extraction results that pyrolysis converted Cu and Zn into less labile phases such as organic/ sulfide and residual fractions. The potential bioaccessibility of Zn decreased for both the PB and SB, closely depending on the content of non-residual Zn. The bioaccessibility of Cu, however, increased for the SB prepared at 300℃ 700℃, probably due to the increased proportion of CuO. Concerning the results of sequential fi＇actionation schemes, bioaccessibility extraction and leaching procedure, pyrolysis at 500℃ was suggested as means of reducing Cu/Zn lability and poultry manure was more suitable for pyrolysis treatment.

关键词： Animal manure Biochar Metals Molecular species Pyrolysis

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Single-atom-mediated electron islands boost photocatalytic CO_(2)chemical fixation

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Science China Chemistry 2024年第7期67卷 2292-2299页

作者： Shu Shang Lei Li xin He Hui Wang Lirong Zheng Wei Shao xiaodong Zhang Yi Xie Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Chemistry and Chemical Engineering Hefei Normal UniversityHefei 230031China

Photocatalytic cycloadditions of CO_(2)with epoxides are emerging as a significant platform for the green synthesis of valuable carbonates,where efficient catalytic systems with spatially separated charge carriers are ***,a single p-block metal atom is proposed to be a candidate for photogenerated electron localization on a metal oxide *** taking the Bi single-atom supported on ZnO nanosheet(Bi1/ZnO)as an example,we show that the Bi atom plays the role of an electron island in the sea of delocalized holes within ***,the as-formed electron island could readily promote the rate-determining ring-opening process of cycloaddition *** from the unique spatially separated electrons and holes,the Bi1/ZnO achieves a high yield of cyclic carbonates with almost 100%*** study provides a pioneering strategy for enhancing the performances of photocatalytic CO_(2)chemical fixation.

关键词： electron islands CO_(2)photofixation photogenerated charge carriers

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High-precision pose measurement method in wind tunnels based on laser-aided vision technology

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Chinese Journal of Aeronautics 2015年第4期28卷 1121-1130页

作者： Liu Wei Ma xin Li Xiao Chen Ling Zhang Yang Li xiaodong Shang Zhiliang Jia Zhenyuan Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education Dalian University of Technology

The measurement of position and attitude parameters for the isolated target from a highspeed aircraft is a great challenge in the field of wind tunnel simulation *** this paper,firstly, an image acquisition method for small high-speed targets with multi-dimensional movement in wind tunnel environment is proposed based on laser-aided vision *** with the trajectory simulation of the isolated model, the reasonably distributed laser stripes and selfluminous markers are utilized to capture clear images of the ***, after image processing,feature extraction, stereo correspondence and reconstruction, three-dimensional information of laser stripes and self-luminous markers are ***, a pose solution method based on projected laser stripes and self-luminous markers is ***, simulation experiments on measuring the position and attitude of high-speed rolling targets are conducted, as well as accuracy verification *** results indicate that the proposed method is feasible and efficient for measuring the pose parameters of rolling targets in wind tunnels.

关键词： High-speed motion Machine vision Pose measurement Structured light Wind tunnel

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HQNN-SFOP:Hybrid Quantum Neural Networks with Signal Feature Overlay Projection for Drone Detection Using Radar Return Signals-A Simulation

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Computers, Materials & Continua 2024年第10期81卷 1363-1390页

作者： Wenxia Wang Jinchen Xu xiaodong Ding Zhihui Song Yizhen Huang xin Zhou Zheng Shan School of Cyberspace Security Information Engineering UniversityZhengzhou450001China

With the wide application of drone technology,there is an increasing demand for the detection of radar return signals from *** detection methods mainly rely on time-frequency domain feature extraction and classical machine learning algorithms for image *** method suffers from the problem of large dimensionality of image features,which leads to large input data size and noise affecting ***,this paper proposes to extract signal time-domain statistical features for radar return signals from drones and reduce the feature dimension from 512×4 to 16 ***,the downscaled feature data makes the accuracy of traditional machine learning algorithms decrease,so we propose a new hybrid quantum neural network with signal feature overlay projection(HQNN-SFOP),which reduces the dimensionality of the signal by extracting the statistical features in the time domain of the signal,introduces the signal feature overlay projection to enhance the expression ability of quantum computation on the signal features,and introduces the quantum circuits to improve the neural network’s ability to obtain the inline relationship of features,thus improving the accuracy and migration generalization ability of drone *** order to validate the effectiveness of the proposed method,we experimented with the method using the MM model that combines the real parameters of five commercial drones and random drones parameters to generate data to simulate a realistic *** results show that the method based on statistical features in the time domain of the signal is able to extract features at smaller scales and obtain higher accuracy on a dataset with an SNR of 10 *** the time-domain feature data set,HQNNSFOP obtains the highest accuracy compared to other conventional *** addition,HQNN-SFOP has good migration generalization ability on five commercial drones and random drones data at different SNR *** method verifies the fe

关键词： Quantum computing hybrid quantum neural network drone detection using radar signals time domain features

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