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| 1 | Optimization and test for spraying parameters of cotton defoliant sprayer显示文摘Boom sprayer is widely used in large farm crops because of its high working efficiency and favorable spraying effect.But there are still some problems in cotton defoliant spraying in Xinjiang,China.Cotton is planted in a high density in Xinjiang,the row space is(10+66)cm,leaves in two adjacent rows are seriously overlapped,the lower leavers are poorly sprayed,so the defoliation effect is poor,and the cotton quality is degraded.To solve this problem and improve the defoliant droplets coverage on the cotton canopy,the original boom spraying was modified,and the spraying pardameters was optimized by the central combination test and design concept of Box-Behnken based on a single-factor test.A quadratic polynomial model of droplets coverage was created by using working parameters including horizontal spraying boom height,hang boom height and nozzles angle as the influential factors and the mean droplets coverage on cotton canopy as the target function,and the effectiveness of mode and interaction of factors were analyzed.The model was optimized and analyzed using the regression analysis method and response surface analysis method of software Design-Expert 7.0.0,and the optimal combination of spraying parameters was obtained.The results showed that the droplets coverage on cotton canopy were influenced by boom height,sprayer height and angled nozzles sequentially from large to small,and the optimal combination of spraying parameters was under horizontal spraying boom height of 134 cm,hang spraying boom height of 27.5 cm and nozzles angle of 21°.The mean droplets coverage of experimental value and predicted value on cotton canopy were 19.6%and 20.43%respectively in such conditions,and the relative error to the estimated value on the model was–4.25%.The research result can provide a reference for further optimizing the spraying parameters of cotton defoliant sprayer. | Qin Weicai Xue Xinyu Cui Longfei Zhou Qingqing Xu Zhufeng Chang Feilong | 2016 | International Journal of Agricultural and Biological Engineering2016，9，4： | 9 |
| 2 | Optimized design and test for a pendulum suspension of the crop spray boom in dynamic conditions based on a six DOF motion simulator显示文摘Spray deposit distribution from a field sprayer is mainly affected by the boom movements when the tractor is driven over a rough soil surface,the pendulum suspension that used to reduce and control the movement of spray boom by isolating the boom from vibrations of the tractor will directly enhance uniform deposition of chemicals.However,how to match the parameters of the suspension with the properties of the boom is the key problem.The dynamic rigid-flexible coupling model of the virtual prototype of the spray boom suspension system was established by using ADAMS and ABAQUS software.An optimization of the suspension parameters for a large spay boom was carried out based on the optimal Latin hypercube design,radial basis function neural network,and multi-objective genetic algorithm NSGA-II.After modified parameters of the suspension,the travel of the sprayer on a typical field motion track was simulated based on a six DOF motion simulator,and the dynamic behavior of the boom suspension was measured.The results show that RMS of the measured boom roll angle and the boom center displacement for optimized solution were reduced by 14.76%and 12.43%compared with the original suspension.Finally,the inertial measurement unit(IMU)was used to measure the movements of the sprayer vehicle during the pesticide application on the Hongze Lake Farm,the experiment of field condition reproduced by using the six DOF motion simulator,the standard deviation of the roll angle and vibration displacement for the optimized sprayer boom are only 0.6382°and 62.279 mm respectively.The research provides theoretical basis and experimental method for parameter optimization of large scale boom suspension. | Longfei Cui Hanping Mao Xinyu Xue Suming Ding Baiyu Qiao | 2018 | International Journal of Agricultural and Biological Engineering2018，11，3： | 9 |
| 3 | Nonvolatile memristor based on heterostructure of 2D room-temperature ferroelectric α-In2Se3 and WSe2显示文摘Two-dimensional(2D) ferroelectricity is considered to have significant potential for information storage in the future. Semiconducting ferroelectrics that are stable at room temperature afford many possibilities for the assembly of various high-performance heterostructures and fabricating multifuntional devices.Herein, we report the synthesis of a stable van der Waals(vd W) single-crystal semiconductor α-In2 Se3.Piezoresponse force microscopy(PFM) measurements demonstrated the out-of-plane ferroelectricity in ~15 layers α-In2 Se3 at room temperature. Both ferroelectric domains with opposite polarization and the tested amplitude and phase curve proved that this semiconductor exhibits hysteresis behavior during polarization.In the α-In2Se3/WSe2 vertical heterostructure device, the switchable diode effect and nonvolatile memory phenomenon showed a high on/off ratio and a small switching voltage. The distinct resistance switches were further analyzed by band alignment of the heterostructure under different polarizations by first principle calculations. Nonvolatile memory based on vd W ferroelectric heterostructure could provide a novel platform for developing 2 D room-temperature ferroelectrics in information storage. | Huai YANG Mengqi XIAO Yu CUI Longfei PAN Kai ZHAO Zhongming WEI | 2019 | Science China(Information Sciences)2019，62，12： | 3 |
| 4 | Design and experiment of electro hydraulic active suspension for controlling the rolling motion of spray boom显示文摘Boom sprayer is one of the most commonly used plant protection machinery for spraying pesticide.Studies have shown that the efficiency of chemicals is highly correlated with the uniformity of spray distribution patterns.As the boom is a large and flexible structure,boom rolling leads to overlapping and leakage of the pesticides.In order to improve spray uniformity,the boom attitude should be kept parallel to the ground slope or to the crop canopy beneath the boom.Passive suspension can attenuate frequencies above its resonance frequency,but nothing can be done to align the boom to the sloping ground.Therefore,an active suspension system is designed,which includes DSP-based controller,a servo valve,a hydraulic cylinder,two ultrasonic sensors,one inertial attitude sensor,and the developed control procedures.In order to prevent the wrong response of the control system caused by the high frequency component due to uneven crop canopy or rough ground.A special signal processing algorithm was proposed,including the limiting filter,smoothing algorithm and data fusion algorithm based on optimal weight.The transient and steady-state performances of the boom control system using velocity feedforward PID algorithm were tested on a six DOF motion simulator.It can be seen that the low-frequency tracking performance of the boom was greatly improved after the electro-hydraulic active suspension was added.At the resonance frequency,the peak angle of active suspension and passive suspensions are 0.72°and 1.29°respectively,and the resonance peak is greatly reduced.The controller was implemented on a self-propelled boom sprayer and validated under field conditions,the standard deviation of the roll angle of the boom with active suspension is 0.40°,compared with 1.04°of the sprayer chassis.Experimental results show that the active suspension control system can effectively reduce the effect of ground excitation disturbance on the application process,and has good tracking performance for low frequency terrain change. | Longfei Cui Xinyu Xue Feixiang Le Hanping Mao Suming Ding | 2019 | International Journal of Agricultural and Biological Engineering2019，12，4： | 3 |
| 5 | Combination therapy using microwave ablation and d-mannose-chelated iron oxide nanoparticles inhibits hepatocellular carcinoma progression显示文摘Despite being a common therapy for hepatocellular carcinoma(HCC),insufficient thermal ablation can leave behind tumor residues that can cause recurrence.This is believed to augment M2 inflammatory macrophages that usually play a pro-tumorigenic role.To address this problem,we designed D-mannose-chelated iron oxide nanoparticles(man-IONPs) to polarize M2-like macrophages into the antitumor Ml phenotype.In vitro and in vivo experiments demonstrated that man-IONPs specifically targeted M2-like macrophages and accumulated in peri-ablation zones after macrophage infiltration was augmented under insufficient microwave ablation(MWA).The nanoparticles simultaneously induced polarization of pro-tumorigenic M2 macrophages into antitumor M1 phenotypes,enabling the transformation of the immunosuppressive microenvironment into an immunoactivating one.Post-MWA macrophage polarization exerted robust inhibitory effects on HCC progression in a well-established orthotopic liver cancer mouse model.Thus,combining thermal ablation with man-IONPs can salvage residual tumors after insufficient MWA.These results have strong potential for clinical translation. | Rui Cui Luo Wang Dongyun Zhang Kun Zhang Jianping Dou Linan Dong Yixuan Zhang Jiapeng Wu Longfei Tan Jie Yu Ping Liang | 2022 | Acta Pharmaceutica Sinica B2022，12，9： | 2 |
| 6 | An SDN Oriented Loop Detection Mechanism Based on TTL Statistics显示文摘The rise of the network has injected new impetus into the development of traditional networks.Due to the complexity of the network itself and its network programmability,there is a risk of routing loops occurring in the SDN network.This paper proposes a loop detection mechanism.According to the Time To Live(TTL)value of the loop packet,there is approximately periodicity in the same loop.We use sFlow to count the number of packets corresponding to each TTL value of a switch in the loop over a period of time,and perform discrete Fourier transform on the obtained finite-length sequence to observe its frequency domain performance and determine whether there are periodic features.By doing so,it is determined whether there is a routing loop,and the purpose of passively detecting the routing loop is achieved.Compared to existing algorithms,it has advantages in real-time,scalability and false positive rate.The experimental results show that the routing loop detection algorithm based on TTL statistics in this paper still maintains high judgment accuracy under the scenarios of lower stream sampling rate and smaller detection period. | Tao Yu Longfei Yu Diyue Chen Hongyan Cui Jilong Wang | 2020 | China Communications2020，17，6： | 2 |
| 7 | The prevalence of dementia in urban and rural areas of China显示文摘 | Jianping Jia Fen Wang Cuibai Wei Aihong Zhou Xiangfei Jia Fang Li Muni Tang Lan Chu Youlong Zhou Chunkui Zhou Yong Cui Qi Wang Weishan Wang Peng Yin Nan Hu Xiumei Zuo Haiqing Song Wei Qin Liyong Wu Dan Li Longfei Jia Juexian Song Ying Han Yi Xing Peijie Y | 2013 | Alzheimer’s & Dementia: The Journal of the Alzheimer’s Association2013，，： | 2 |
| 8 | Design and implementation of a nonlinear robust controller based on the disturbance observer for the active spray boom suspension显示文摘Spray boom vibrations are one of the main causes of the uneven distribution of agrochemicals.Using active suspension to maintain the correct height of nozzles is critical for obtaining a uniform spray pattern and minimizing the possibility of spray drift.However,the electro-hydraulic active pendulum boom suspension has nonlinear uncertain factors such as parameter uncertainties,external disturbances,model error,etc.,which complicate the design of the controller.Therefore,this paper proposes a nonlinear robust feedback control method with disturbances compensation,which integrates a robust controller and disturbance observers through the backstepping method.Initially,to verify the performance of the controller,the Lyapunov stability theory is used to prove that the proposed controller can guarantee the given transient performance and the final tracking accuracy.Furthermore,taking the active suspension of a 28 m wide boom driven by a single-rod hydraulic actuator as an implementation case,the proposed NRCDC controller was compared with a variety of control schemes through a rapid control prototype of a pendulum active suspension.Finally,the proposed control scheme is implemented on a self-propelled sprayer with a boom of 12 m in length.The field test results show that all the performance indicators of the NRCDC controller are better than the other three conventional controllers.Both laboratory and field tests have verified the effectiveness and high performance of the proposed controller. | Longfei Cui Xinyu Xue Wei Kong Suming Ding Wei Gu Feixiang Le | 2023 | International Journal of Agricultural and Biological Engineering2023，16，1： | 0 |
| 9 | Pseudotyped lentiviral vectors:Ready for translation into targeted cancer gene therapy?显示文摘Gene therapy holds great promise for curing cancer by editing the deleterious genes of tumor cells,but the lack of vector systems for efficient delivery of genetic material into specific tumor sites in vivo has limited its full therapeutic potential in cancer gene therapy.Over the past two decades,increasing studies have shown that lentiviral vectors(LVs)modified with different glycoproteins from a donating virus,a process referred to as pseudotyping,have altered tropism and display cell-type specificity in transduction,leading to selective tumor cell killing.This feature of LVs together with their ability to enable high efficient gene delivery in dividing and non-dividing mammalian cells in vivo make them to be attractive tools in future cancer gene therapy.This review is intended to summarize the status quo of some typical pseudotypings of LVs and their applications in basic anti-cancer studies across many malignancies.The opportunities of translating pseudotyped LVs into clinic use in cancer therapy have also been discussed. | Longfei Deng Ping Liang Hongjuan Cui | 2023 | Genes & Diseases2023，10，5： | 0 |
| 10 | Wavelength-selectivity polarization dependence of optical absorption and photoresponse in SnS nanosheets显示文摘The optical and optoelectronic characteristics of SnS nanosheets with strong anisotropic crystal structure are researched.Transmission electron microscopy and polarized Raman spectra are used to determine the crystal orientation of SnS nanosheets.The photodetector based on SnS nanosheets exhibits the carrier mobility of 37.75 cm^(2)/V·s,photoresponsivity of 310.5 A/W and external quantum efficiency of 8.56×10^(4)%at 450 nm.Optical absorption around the absorption edge presents obvious polarization sensitivity with the highest optical absorption dichroic ratio of 3.06 at 862 nm.Due to anisotropic optical absorption,the polarized photocurrent appears as the periodic change affected by the polarized direction of the incident light at 808 nm.Overall,SnS nanosheets show good potential in the future application of the polarized photodetectors for specific wavelength. | Yu Cui Ziqi Zhou Xinghua Wang Xiaoting Wang Zhihui Ren Longfei Pan Juehan Yang | 2021 | Nano Research2021，14，7： | 0 |
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