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An efficient and safe platform based on the tube-in-tube reactor for implementing gas-liquid processes in flow

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Green Chemical Engineering 2023年第3期4卷 251-263页

作者： Caijin Zhou Bingqi Xie Junxin Chen yiwei Fan Jisong Zhang State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing100084China Engineering Research Center of Advanced Manufacturing Technology for Fine Chemicals College of Chemical EngineeringFuzhou UniversityFuzhou350116China

Recently,the continuous tube-in-tube reactor based on the Teflon AF membrane is emerging as a powerful toolkit for accelerating gas-liquid mass transfer and reaction *** of its large gas-liquid interfacial area and short mass transfer distance,the reactor can allow a fast gas-liquid mass transfer without direct contact between gas and liquid phases,offering an efficient and safe platform for implementing gas-liquid reaction and rapid determination of gas-liquid *** this review,a detailed description and construction method of this reactor are ***,the recent advancements of the tube-in-tube reactor in fundamental studies and practical applica-tions in gas-involved chemical reactions and biosynthetic processes are ***,a perspective on future potential applications of such flow reactors is provided.

关键词： Tube-in-tube reactor Gas-liquid mass transfer rate Biosynthetic process Gas-liquid reaction

Microplastics in sediment of the Three Gorges Reservoir:abundance and characteristics under different environmental conditions

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Journal of Oceanology and Limnology 2024年第1期42卷 101-112页

作者： Wang LI Bo ZU yiwei LIU Juncheng GUO Jiawen LI College of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing 400074China Chongqing Research Academy of Ecology and Environmental Sciences Chongqing 401147China

Freshwater microplastic pollution is an urgent issue of global concern,and research on the distribution in reservoirs is *** investigated the microplastic pollution levels in wet sediments collected from the Three Gorges Reservoir,the largest reservoir of *** show that microplastics were ubiquitous in the sediments of the Three Gorges Reservoir,and their abundance ranged from 59 to 276 pp/kg(plastic particles per kg,dry weight).Economic development and total population were important factors affecting the spatial heterogeneity of microplastic abundance,and the contribution of large cities along the reservoir to microplastic pollution should be paid with more *** microplastics were the most abundant type of microplastic particles in reservoir sediments,whereas polystyrene,polypropylene,and polyamide were the main types of *** apparent spatial heterogeneity in morphology and color of microplastics is attributed to different anthropogenic or landbased pollution ***,the accumulation of microplastics near the inlet of tributaries reflects the role of potential contributors of *** importantly,multiple bisphenols(BPs)and heavy metals detected at the microplastic surfaces indicate that microplastics can act as carriers of these pollutants in the environment in the same way as sediments did,which may alter the environmental fate and toxicity of these ***,we conclude that the Three Gorges Reservoir had been contaminated with microplastics,which posed a stress risk for organisms who ingest them along with their associated pollutants(BPs,heavy metals).

关键词： microplastics Three Gorges Reservoir sediment bisphenol heavy metal

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不同桑树品种扦插生长情况及其生根能力评价

西南大学学报（自然科学版） 2025年第2期47卷 61-69页

作者：袁姜莲李炎罗义维轩亚辉何宁佳资源昆虫高效养殖与利用全国重点实验室/西南大学重庆400715

以10个桑树品种为研究对象,分析了ABT-1、IBA和IAA对桑树扦插的影响,并通过排队评分法和公式评分法对不同桑树品种扦插生根能力进行综合评价,结合聚类分析,以期筛选出易生根的优良品种,为实现桑树规模化扦插育苗提供理论参考。结果表明... 详细信息

以10个桑树品种为研究对象,分析了ABT-1、IBA和IAA对桑树扦插的影响,并通过排队评分法和公式评分法对不同桑树品种扦插生根能力进行综合评价,结合聚类分析,以期筛选出易生根的优良品种,为实现桑树规模化扦插育苗提供理论参考。结果表明:整体上,不同激素处理提高了10个桑树品种的扦插成活率、新梢及根系指标,各指标在品种间、激素种类间及其互作间存在着显著或极显著差异。在不同激素处理下,新剑持的平均成活率和平均根数都最大,分别为78.00%和9.35根;足83122的平均新梢长、平均新梢质量和平均根直径都最大,分别为54.08 cm、31.35 g和1.47 mm;保坎的平均根质量最大,为17.36 g;双头荷叶白的平均根总长最大,为2385.46 cm。相关分析表明:成活率与根数呈显著正相关;新梢性状与根系性状总体呈极显著正相关关系。10个品种综合得分从高到低排序为:足83122、新剑持、双头荷叶白、伊达寿木桑、保坎、60178、沱桑、火桑、山西甜桑、葵桑。聚类分析将10个品种聚为易生根型、较易生根型和难生根型3类。足81322和新剑持在不同激素处理下平均成活率较高,且各扦插生长指标均表现良好,可作为桑树规模化扦插育苗的优选品种。

关键词：桑树扦插生根能力排队评分法公式评分法聚类分析综合评价

SR-DCSK Cooperative Communication System with Code Index Modulation:A New Design for 6G New Radios

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China Communications 2023年第10期20卷 1-16页

作者： Yi Fang Wang Chen Pingping Chen yiwei Tao Mohsen Guizani School of Information Engineering Guangdong University of TechnologyGuangzhou 510006China School of Advanced Manufacturing Fuzhou UniversityJinjiang campus362251China Department of Machine Learning MBZUAIAbu Dhabi999041UAE

This paper proposes a high-throughput short reference differential chaos shift keying cooperative communication system with the aid of code index modulation,referred to as CIM-SR-DCSK-CC *** the proposed CIM-SR-DCSK-CC system,the source transmits information bits to both the relay and destination in the first time slot,while the relay not only forwards the source information bits but also sends new information bits to the destination in the second time *** be specific,the relay employs an N-order Walsh code to carry additional log_(2)N information bits,which are superimposed onto the SRDCSK signal carrying the decoded source information ***,the superimposed signal carrying both the source and relay information bits is transmitted to the ***,the theoretical bit error rate(BER)expressions of the proposed CIMSR-DCSK-CC system are derived over additive white Gaussian noise(AWGN)and multipath Rayleigh fading *** with the conventional DCSKCC system and SR-DCSK-CC system,the proposed CIM-SR-DCSK-CC system can significantly improve the throughput without deteriorating any BER *** a consequence,the proposed system is very promising for the applications of the 6G-enabled lowpower and high-rate communication.

关键词： differential chaos shift keying cooperative communication short reference code index modulation high throughput bit error rate

Regulation of sulfur vacancies in vertical nanolamellar MoS_(2)for ultrathin flexible piezoresistive strain sensors

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Journal of Materials Science & Technology 2023年第10期141卷 56-65页

作者： Xing Pang Qi Zhang Yulong Zhao Xiaoya Liang Lukang Wang yiwei Shao State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China

Magnetron-sputtered MoS_(2) has applications in piezoresistive functional materials research owing to its unique ***,the controlled incorporation of sulfur vacancies and realization of en-hanced piezoresistive performance remain significant *** this work,the direct growth of large-area MoS_(2) films with tunable sulfur vacancy concentrations was successfully achieved via magnetron sputtering at various *** analysis revealed that the application of strain al-tered the number of conductive channels between the vertical MoS_(2) nanosheets,changing the measured resistance and leading to excellent piezoresistive *** importantly,the unsaturated electrons due to the sulfur vacancies increased the in-plane carrier concentration of the MoS_(2)nanosheets.A de-position temperature of 50℃afforded the highest concentrations of sulfur vacancies and *** MoS_(2)films possessed a carrier concentration of 6.58×10^(17)cm^(−3),which was 40.9%higher than that ob-tained at 150°C,and displayed superior piezoresistive *** films exhibited high gage factors of 2.66 and 23.22 under tensile and compressive strain of≤0.29%,*** values were 118%and 323%higher,respectively,than those obtained for films deposited at 150°*** work provides an effective route for modulating and mass producing MoS_(2)-based piezoresistive electronic devices.

关键词： MoS_(2) Sulfur vacancy Electron transport Piezoresistance Sensors

Night-time radiative warming using the atmosphere

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Light(Science & Applications) 2023年第12期12卷 2589-2596页

作者： Yining Zhu yiwei Zhou Bing Qin Rui Qin Min Qiu Qiang Li State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake UniversityHangzhou 310024China Institute of Advanced Technology Westlake Institute for Advanced StudyHangzhou 310024China

Night-time warming is vital for human production and daily *** methods like active heaters are energy-intensive,while passive insulating films possess restrictions regarding space consumption and the lack of heat *** this work,a nanophotonic-based night-time warming strategy that passively inhibits thermal radiation of objects while actively harnessing that of atmosphere is *** using a photonic-engineered thin film that exhibits high reflectivity(~0.91)in the atmospheric transparent band(8-14μm)and high absorptivity(~0.7)in the atmospheric radiative band(5-8 and 14-16μm),temperature rise of 2.1℃/4.4℃compared to typical low-e film and broadband absorber is ***,net heat loss as low as 9Wm-2 is experimentally observed,compared to 16 and 39Wm-2 for low-e film and broadband absorber,*** strategy suggests an innovative way for sustainable warming,thus contributes to addressing the challenges of climate change and promoting global carbon neutrality.

关键词： passive radiative absorber

Numerical analysis of wind effects on aerodynamic characteristics of a ducted fan

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Chinese Journal of Aeronautics 2024年第5期37卷 263-280页

作者： yiwei LUO Tianfu AI Yuhang HE Bin XU Yuping QIAN Yangjun ZHANG State Key Laboratory of Intelligent Green Vehicle and Mobility School of Vehicle and MobilityTsinghua UniversityBeijing 100084China Key Laboratory of Conveyance and Equipment Ministry of Education East China Jiaotong UniversityNanchang 330013China Vehicle Research Center School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Ducted fans have been extensively used in Unmanned Aerial Vehicles(UAVs)for a variety of missions because of high efficiency,high safety and low ***,as a kind of typical meteorological condition,brings significant aerodynamic interference to the ducted fan,which seriously threatens flight stability and *** this work,the numerical simulation with the Unsteady Reynolds Averaged Navier-Stokes(URANS)method and the sliding mesh technique is performed to evaluate the steady wind *** results show that the wind will lead to serious unsteady effects in the flow field,and the thrust fluctuates at the blade passing frequency of 200 *** the wind speed increases,the rotor thrust increases,the duct thrust decreases,and the total thrust changes *** instability may occur when the wind speed exceeds 8 m/*** the angle of low-speed wind increases,the rotor thrust changes little,the duct thrust increases,and the total thrust *** addition,we figure out that cases with the same crosswind ratio are similar in results,and increasing the rotating speed or fan radius is beneficial to performance improvement in *** findings are essential to the ducted fan design and UAV flight control design for stable and safe operations in wind conditions.

关键词： Unmanned Aerial Vehicle(UAV) Ducted fan Wind effect Thrust fluctuations Computational Fluid Dynamics(CFD)

Mechanical design,modeling,and identification for a novel antagonistic variable stiffness dexterous finger

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Frontiers of Mechanical Engineering 2022年第3期17卷 59-74页

作者： Handong HU yiwei LIU Zongwu XIE Jianfeng YAO Hong LIU State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

This study traces the development of dexterous hand research and proposes a novel antagonistic variable stiffness dexterous finger mechanism to improve the safety of dexterous hand in unpredictable environments,such as unstructured or man-made operational errors through comprehensive consideration of cost,accuracy,manufacturing,and *** on the concept of mechanical passive compliance,which is widely implemented in robots for interactions,a finger is dedicated to improving mechanical *** finger mechanism not only achieves passive compliance against physical impacts,but also implements the variable stiffness actuator principle in a compact finger without adding supererogatory *** achieves finger stiffness adjustability according to the biologically inspired stiffness variation principle of discarding some mobilities to adjust *** mechanical design of the finger and its stiffness adjusting methods are *** stiffness characteristics of the finger joint and the actuation unit are *** results of the finger joint stiffness identification and finger impact tests under different finger stiffness presets are provided to verify the validity of the *** have been experimentally proven to be robust against physical ***,the experimental part verifies that fingers have good power,grasping,and manipulation performance.

关键词： multifingered hand mechanism design robot safety variable stiffness actuator

Phosphorus removal from sediments by Potamogeton crispus:New high-resolution in-situ evidence for rhizosphere assimilation and oxidization-induced retention

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Journal of Environmental Sciences 2021年第11期33卷 181-192页

作者： Hezhong Yuan yiwei Cai Zhen Yang Qiang Li Enfeng Liu Hongbin Yin Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Department of Soil Science University of Wisconsin-Madison53706 MadisonWIUnited States College of Geography and Environment Shandong Normal UniversityJi’nan 250359China

Macrophytes are usually chosen for phytoremediation tools to remove P in eutrophic aquatic ecosystems,but the lack of test methods hinders the understanding of removal mechanism and *** this study,we used the novel technologies combined of Diffusive gradients in thin films(DGT),Planar optode(PO),and Non-invasive micro-test technology(NMT)to explore P dynamics in water-sediment continuum and rhizosphere of Potamogeton crispus over *** of the high-resolution in situ measurement showed that labile P(LPDGT)fluxes at the surficial sediment significantly decreased from approximate 120,140,and 200 pg/(cm^(2)·sec)via 30 days incubation period to 17,40,and 56 pg/(cm2•sec)via that of 15 *** synchronous increase of LPDGT was not detected in overlying water,suggesting the intense assimilation of dissolve reactive P via root over *** measurement indicated that O_(2)concentration around the rhizosphere remarkably increased and radially diffused into deeper sediment until 100%saturation along with the root stretch *** detection of roots showed the obvious O_(2)inflow into root tissue with the uppermost flux of 30 pmol/(cm2•sec)from surroundings via aerenchyma on different treatment *** from previous reports,gradually saturating O_(2)concentrations around the rhizosphere was principally driven by O_(2)penetration through interspace attributing to root stretch downward rather than root O_(2)*** O_(2)concentrations in deep sediment over time finally induced the oxidization of labile Fe(II)into Fe(III)bound P and local P immobilization.

关键词： Phosphorus removal Potamogeton crispus Diffusive gradients in thin films (DGT) Planar optode(PO) Non-invasive Micro-test Technique (NMT) Rhizosphere