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| 1 | Numerical simulation and experimental verification on downwash air flow of six-rotor agricultural unmanned aerial vehicle in hover显示文摘Recently,multi-rotor unmanned aerial vehicle(UAV)becomes more and more significantly irreplaceable in the field of plant protection against diseases,pests and weeds of crops.The easy takeoff and landing performance,hover function and high spraying efficiency of UAV are urgently required to spray pesticide for crop timely and effectively,especially in dispersed plots and hilly mountains.In such situations,the current researches about UAV spray application mainly focus on studying the influence of the UAV spraying parameters on the droplet deposition,such as operation height,operation velocity and wind velocity.The deposition and distribution of pesticide droplets on crops which depends on installation position of nozzle and airflow distribution characteristics of UAV are directly related to the control effect of pesticide and crop growth in different growth periods.As a preliminary step,this study focuses on the dynamic development law and distribution characteristics of the downwash air flow for the SLK-5 six-rotor agricultural UAV.Based on compressible Reynolds-averaged Navier-Stokes(RANS)equations with an RNG k-εturbulence model and dynamic mesh technology,the efficient three-dimensional computational fluid dynamics(CFD)method was established to analyze the flow field distribution characteristics of UAV in hover.Then the unsteady interaction flow field of the wing was investigated in detail.The downwash wind speed of the marked points for the SLK-5 UAV in hover was also tested by weather tracker.It was found that the maximum velocity value of the downwash flow was close to 10 m/s;the z-direction velocity was the main body of the wind velocity in the downwash airflow,and the comparison of the wind velocity experiment test and simulation showed that the relative error was less than 12%between the experimental and simulated values of the z-direction velocity at the marked points.Then the flow characteristics of the longitudinal and cross section were analyzed in detail,the results obtained can be used as a reference for drift and sedimentation studies for multi-rotor unmanned aerial vehicle. | Yang Fengbo Xue Xinyu Zhang Ling Sun Zhu | 2017 | International Journal of Agricultural and Biological Engineering2017，10，4： | 28 |
| 2 | Assessing changes in wind erosion climatic erosivity in China's dryland region during 1961-2012显示文摘 | YANG Fengbo LU Changhe | 2016 | Journal of Geographical Sciences2016，26，9： | 11 |
| 3 | Cucurbit[10]uril-based chemistry显示文摘Cucurbit[n]urils(CB[n]s,n = 5-8,10,13-15) have been proven to be an interesting macrocyclic family with their distinctive molecular recognition properties and fascinating applications in fields such as catalysis,supramolecular materials, drug delivery and biological systems. With the biggest cavity in the CB[n]s family, CB[10] shows its unique molecular recognition properties that are rather distinctive from other CB[n]s. In this review, we summarize the progresses in CB[10]-based chemistry since CB[10] was first reported as CB[10] CB[5] complex in 2001. Purification, molecular recognition and supramolecular assembly of CB[10] will be described and an outlook will be given for further exploration of CB[10]-based chemistry. | Xiran Yang Fengbo Liu Zhiyong Zhao Feng Liang Haijun Zhang Simin Liu | 2018 | Chinese Chemical Letters2018，29，11： | 2 |
| 4 | Hydrophobic aerogel-modified hemostatic gauze with thermal management performance显示文摘Current hemostatic agents or dressings are not efficient under extremely hot and cold environments due to deterioration of active ingredients,water evaporation and ice crystal growth.To address these challenges,we engineered a biocompatible hemostatic system with thermoregulatory properties for harsh conditions by combining the asymmetric wetting nano-silica aerogel coated-gauze(AWNSA@G)with a layer-by-layer(LBL)structure.Our AWNSA@G was a dressing with a tunable wettability prepared by spraying the hydrophobic nano-silica aerogel onto the gauze from different distances.The hemostatic time and blood loss of the AWNSA@G were 5.1 and 6.9 times lower than normal gauze in rat’s injured femoral artery model.Moreover,the modified gauze was torn off after hemostasis without rebleeding,approximately 23.8 times of peak peeling force lower than normal gauze.For the LBL structure,consisting of the nano-silica aerogel layer and a n-octadecane phase change material layer,in both hot(70℃)and cold(-27℃)environments,exhibited dual-functional thermal management and maintained a stable internal temperature.We further verified our composite presented superior blood coagulation effect in extreme environments due to the LBL structure,the pro-coagulant properties of nano-silica aerogel and unidirectional fluid pumping of AWNSA@G.Our work,therefore,shows great hemostasis potential under normal and extreme temperature environments. | Xiaoli Jia Chao Hua Fengbo Yang Xiaoxiao Li Peng Zhao Feifan Zhou Yichi Lu Hao Liang Malcolm Xing Guozhong Lyu | 2023 | Bioactive Materials2023，，8： | 1 |
| 5 | Multi-Robot Privacy-Preserving Algorithms Based on Federated Learning:A Review显示文摘The robotics industry has seen rapid development in recent years due to the Corona Virus Disease 2019.With the development of sensors and smart devices,factories and enterprises have accumulated a large amount of data in their daily production,which creates extremely favorable conditions for robots to perform machine learning.However,in recent years,people’s awareness of data privacy has been increasing,leading to the inability to circulate data between different enterprises,resulting in the emergence of data silos.The emergence of federated learning provides a feasible solution to this problem,and the combination of federated learning and multi-robot systems can break down data silos and improve the overall performance of robots.However,as scholars have studied more deeply,they found that federated learning has very limited privacy protection.Therefore,how to protect data privacy from infringement remains an important issue.In this paper,we first give a brief introduction to the current development of multi-robot and federated learning;second,we review three aspects of privacy protection methods commonly used,privacy protection methods for multi-robot,and Other Problems Faced by Multi-robot Systems,focusing on method comparisons and challenges;and finally draw conclusions and predict possible future research directions. | Jiansheng Peng Jinsong Guo Fengbo Bao Chengjun Yang Yong Xu Yong Qin | 2023 | Computers, Materials & Continua2023，77，12： | 0 |
| 6 | Venetoclax and Azacitidine in Chinese patients with untreated acute myeloid leukemia ineligible for intensive chemotherapy显示文摘Dear Editor,Acute Myeloid Leukemia(AML)patients are often found ineligible for aggressive standard chemotherapy in clinic because of old age and poor conditions.Current evidences suggest that targeted combination therapy might help these patients achieve a higher response rate with acceptable adverse events(AEs).^(1)Venetoclax(VEN),a selective small-molecule BCL2 inhibitor,combined with hypomethylating agent(HMA),such as azacytidine(AZA). | Leiming Xia Wanlu Tian Yiming Zhao Lingling Jiang Wei Qian Lei Jiang Ling Ge Jianjun Li Fengbo Jin Mingzhen Yang | 2023 | Signal Transduction and Targeted Therapy2023，8，6： | 0 |
| 7 | Network Invulnerability Enhancement Algorithm Based on WSN Closeness Centrality显示文摘Wireless Sensor Network(WSN)is an important part of the Internet of Things(IoT),which are used for information exchange and communication between smart objects.In practical applications,WSN lifecycle can be influenced by the unbalanced distribution of node centrality and excessive energy consumption,etc.In order to overcome these problems,a heterogeneous wireless sensor network model with small world characteristics is constructed to balance the centrality and enhance the invulnerability of the network.Also,a new WSN centrality measurement method and a new invulnerability measurement model are proposed based on the WSN data transmission characteristics.Simulation results show that the life cycle and data transmission volume of the network can be improved with a lower network construction cost,and the invulnerability of the network is effectively enhanced. | Qian Sun Fengbo Yang Xiaoyi Wang Jing Li Jiping Xu Huiyan Zhang Li Wang Jiabin Yu Xiao Peng Ruichao Wang | 2022 | Computers, Materials & Continua2022，，11： | 0 |
| 8 | Optimal Deployment of Heterogeneous Nodes to Enhance Network Invulnerability显示文摘Wireless sensor networks(WSN)can be used in many fields.In wireless sensor networks,sensor nodes transmit data in multi hop mode.The large number of hops required by data transmission will lead to unbalanced energy consumption and large data transmission delay of the whole network,which greatly affects the invulnerability of the network.Therefore,an optimal deployment of heterogeneous nodes(ODHN)algorithm is proposed to enhance the invulnerability of the wireless sensor networks.The algorithm combines the advantages of DEEC(design of distributed energy efficient clustering)clustering algorithm and BAS(beetle antenna search)optimization algorithm to find the globally optimal deployment locations of heterogeneous nodes.Then,establish a shortcut to communicate with sink nodes through heterogeneous nodes.Besides,considering the practical deployment operation,we set the threshold of the mobile location of heterogeneous nodes,which greatly simplifies the deployment difficulty.Simulation results show that compared with traditional routing protocols,the proposed algorithm can make the network load more evenly,and effectively improve energy-utilization and the fault tolerance of the whole network,which can greatly improve the invulnerability of the wireless sensor networks. | Qian Sun Fengbo Yang Xiaoyi Wang Jiping Xu Huiyan Zhang Li Wang Jiabin Yu Xiao Peng Ruichao Wang | 2022 | Computers, Materials & Continua2022，，11： | 0 |
| 9 | Steering and braking game control architecture based minimax robust stability control for emergency avoidance of autonomous vehicles显示文摘The existing electronic stability control(ESC)system does not consider the steering intention of an autonomous driving system(ADS)during autonomous driving emergency avoidance.The distributed control scheme between ESC and ADS does not involve any information interaction,and the balance between path tracking and lateral stability is not optimal.A Nash game control scheme of steering and braking system is proposed to ensure that both path tracking and stability are simultaneously in the loop and solve the conflict by simulating the interaction between the two agents considering the impact on the interaction between a path following and lateral stability.Each agent considers its interests and the opponent’s interest,resulting in a global optimal control solution of steering control and ESC.Then,using minimax optimization theory,a lateral stability strategy is proposed to make the game control architecture under emergency avoidance more robust to uncertain lateral disturbances.Finally,simulation and hardware in the loop experiments show that the proposed scheme can consider both vehicle’s path following performance and lateral stability in the event of an emergency. | WU Jian WU DeXi YAN Yang ZHANG Ning BAO ChunJiang WANG FengBo | 2022 | Science China(Technological Sciences)2022，65，4： | 0 |
| 10 | Novel Gas-tight Multi-sampler for Discrete Deep-sea Water显示文摘The issues of how to quickly collect seawater samples and of how to make sure that those samples truly reflect the in-situ information on gas composition and concentration have therefore become a hot but difficult topic in the field of ocean technology.Most conventional seawater samplers only focus on collecting seawater itself,but take little consideration on gas preservation.A set of new oceanographic tools are presented for ocean resource exploration such as hydrothermal sulfide and gas hydrate,and for investigations on the processes and mechanisms of marine physical,chemical and biological evolutions.A gas-tight deep-sea water sampling system(GTWSS) is designed for the collection of deep-sea geochemical samples.This set of tools mainly consists of a conductivity temperature depth profiler(CTD),release devices and gas-tight deep-sea water samplers(GTWS).The GTWS is able to hold the gases in deep-sea water samples tightly,providing in-situ information on gas contents in the seawater samples and can be deployed on a routine wire-deployed CTD sampler for multi-layer discrete sampling of gas-tight seawater.Sea trials are performed successfully in 2008 and 2009,on a research vessel named HaiYang Si Hao in South China Sea,with the deepest trial depth 3 930 m.GTWSS is capable of quickly sampling 12 discrete gas-tight seawater samples(8.3 L per sample) during its single deployment.The head space method is employed to separate the gases from the seawater samples immediately after recovery of the seawater samples on the vessel.Field geochemical analysis is carried out by gaseous hydrocarbon sensors and an infrared gas analyzer.Results show that the concentrations of CH4 and CO2 in the seawater sampled by GTWSS are higher than those sampled by general non-gas-tight water samplers,thus confirming the gas tightness of GTWSS.Seawater samples can be collected quickly by using GTWSS,and GTWSS can keep the samples' integrity quite well. | HUANG Haocai YANG Canjun CHEN Shicheng CHEN Daohua SUN Chunyan NIU Wenda LI Fengbo LIU Guanghu CHEN Ying | 2012 | Chinese Journal of Mechanical Engineering2012，25，4： | 0 |
| 11 | Flavonoid-producing tomato plants have a direct negative effect on the zoophytophagous biological control agent Oriussauteri显示文摘Orius sauteri(Poppius)(Hemiptera:Anthocoridae)is often used for biological control of small arthropod pests in greenhouse vegetable production systems in Asia.In addition to feeding on arthropod prey,O.sauteri consumes small quantities of plant material.Previous studies demonstrated that tomato plant chemistry confers antixenosis resistance to phloem-feeding whiteflies,but the potential nontarget effects of phytochemicals on the beneficial predator O.sauteri are unknown.Comparison of O.sauteri confined to near-isogenic lines(NILs)of tomatoes producing high levels offlavonoids(NIL-purple hypocotyl;resistant to whiteflies)and low levels of flavonoids(NIL-green hypocotyl;susceptible to whiteflies)revealed that O.sauteri had reduced oviposition,nymphal survival,and development on resistant plants,even if they were also provided with prey that did not feed on the host plant.Moreover,O.sauteri showed a significant ovipositional preference in choice assays,laying significantly more eggs on susceptible than on resistant plants.Molecular gut content analysis using the specific chloroplast trnL gene from tomato confirmed that adult and immature O.sauteri feed on both resistant and susceptible genotypes,and feeding behavior assays revealed that resistance did not affect plant feeding or prey acceptance by O.sauteri adults.These results demonstrate a direct negative effect of phytochemicals on a nontarget beneficial species and indicate that resistance mediated by phytochemicals can affect organisms that do not solely feed on phloem sap.The results also indicate that the mode of action and the potential ecological effects of phytochemicalmediated resistance are broader than previously recognized. | Fengbo Yang Xinyi Zhang Haowei Shen Hu Xue Tian Tian Qinghe Zhang Jinyu Hu Hong Tong Youjun Zhang Qi Su | 2023 | Insect Science2023，30，1： | 0 |
| 12 | Suspension printing of liquid metal in yield-stress fluid for resilient 3D constructs with electromagnetic functions显示文摘Liquid metal is an ideal conductive material for soft electronics because of its high conductivity and fluidity at room temperature.However,the large surface tension and high mass density of liquid metal make forming three-dimensional(3D)dangling structures a challenging task.Reported here is a suspension printing strategy for direct deposition of galinstan-based liquid metal into 3D dangling structures with high shape fidelity and spatial resolution(~150μm).Acrylamide/nanoclay suspension served as a yieldstress fluid support bath,with selected hydrogen peroxide to immediately oxidize the gallium skin and strengthen the extruded liquid metal,thus continuous liquid metal filaments were deposited successfully.The subsequent photo-curing of acrylamide/nanoclay works as a resilient outer packaging,giving rise to a~500%tensile deformation for liquid metal-hydrogel composite.This suspension printing strategy should broaden the opportunity of using 3D and functional liquid metal constructs for soft yet resilient electromagnetic devices. | Qian Wu Fengbo Zhu Ziliang Wu Yu Xie Jin Qian Jun Yin Huayong Yang | 2022 | npj Flexible Electronics2022，6，1： | 0 |
| 13 | Efcient soluble PTCBI‑type non‑fullerene acceptor materials for organic solar cells显示文摘Single perylene diimide(PDI)used as a non-fullerene acceptor(NFA)in organic solar cells(OSCs)is enticing because of its low cost and excellent stability.To improve the photovoltaic performance,it is vital to narrow the bandgap and regulate the stacking behavior.To address this challenge,we synthesize soluble perylenetetracarboxylic bisbenzimidazole(PTCBI)molecules with a bulky side chain at the bay region,by replacing the widely used“swallow tail”type alkyl chains at the imide position of PDI molecules with a planar benzimidazole structure.Compared with PDI molecules,PTCBI molecules exhibit red-shifted UV–vis absorption spectra with larger extinction coefcient,and one magnitude higher electron mobility.Finally,OSCs based on one soluble PTCBI-type NFA,namely MAS-7,exhibit a champion power conversion efciency(PCE)of 4.34%,which is signifcantly higher than that of the corresponding PDI-based OSCs and is the highest PCE of PTCBI-based OSCs reported.These results highlight the potential of soluble PTCBI derivatives as NFAs in OSCs. | Xiang Gao Fengbo Sun Xinzhu Tong Xufan Zheng Yinuo Wang Cong Xiao Pengcheng Li Renqiang Yang Xunchang Wang Zhitian Liu | 2023 | Frontiers of Optoelectronics2023，16，2： | 0 |
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