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Design and experimental research on the sweet potato seedling transplanting mechanism of the planetary gear train with deformed elliptical gear transmission

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International Journal of Agricultural and Biological Engineering 2024年第3期17卷 91-99页

作者： Bingliang ye yuxuan ye Haili Zhou Gaohong Yu Xiong Zhao Bin Deng Faculty of Mechanical Engineering Zhejiang Sci-Tech UniversityHangzhou 310018China Zhejiang Province Key Laboratory of Transplanting Equipment and Technology Hangzhou 310018China Key Laboratory of Agricultural Equipment for Hilly and Mountainous Areas in Southeastern China(Co-construction by Ministry and Province) Ministry of Agriculture and Rural AffairsHangzhou 310018China

Aiming at the lack of suitable machines for sweet potato seedling transplanting in China,and according to the agronomic requirements for the horizontal insertion method of sweet potato seedling,a new sweet potato seedling transplanting mechanism of planetary gear train was proposed based on the non-uniform transmission of deformed elliptical *** working principle of the transplanting mechanism was analyzed,and the kinematics modeling and analysis of the mechanism were carried *** study established the numerical objectives of the transplanting mechanism and applied the theory of membership function to establish a mathematical model for the parameter-guided optimization design of the transplanting *** parameter-guided optimization design software was developed to obtain a set of optimal mechanism parameters that satisfied the motion trajectory of sweet potato transplanting and the posture of the transplanting *** on the optimized parameters,the structure of the transplanting mechanism was designed,and a virtual prototype of the mechanism was created,whereby a virtual motion simulation of the transplanting mechanism was conducted to verify the correctness of the kinematics model and design of the *** high-speed photographic kinematics test of the mechanism prototype and sweet potato seedling transplanting tests were conducted to test the mechanism’s kinematic characteristics and transplanting *** test results show that the test trajectory of the mechanism and test posture of the transplanting arm are almost consistent with the theoretical and simulation trajectory,meeting the agronomic requirements of the horizontal insertion method of sweet potato seedling;And when the rotary speed of the mechanism are 20 r/min and 30 r/min,the average success ratios of sweet potato seedlings transplanting are 90%and 82%,respectively,which prove the application feasibility of the mechanism in the practical machines.

关键词： sweet potato seedling transplanter transplanting mechanism deformed elliptical gear transmission kinematics analysis membership function optimization design

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Drought-Tolerant Rice at Molecular Breeding Eras:An Emerging Reality

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Rice science 2024年第2期31卷 179-189页

作者： ZHU Chengqi ye yuxuan QIU Tian HUANG Yafan YING Jifeng SHEN Zhicheng Institute of Insect Sciences Zhejiang UniversityHangzhou 310058China Performance Plants Inc. 1287 Gardiners RoadKingstonOntario K7P 3J6Canada China National Rice Research Institute Hangzhou 310006China

Rice(Oryza sativa L.)stands as the most significantly influential food crop in the developing world,with its total production and yield stability affected by environmental *** stress impacts about 45%of the world’s rice area,affecting plants at molecular,biochemical,physiological,and phenotypic *** conventional breeding method,predominantly employing single pedigree selection,has been widely utilized in breeding numerous drought-tolerant rice varieties since the Green *** rapid progress in plant molecular biology,hundreds of drought-tolerant QTLs/genes have been identified and tested in rice crops under both indoor and field *** genes have been introgressed into elite germplasm to develop commercially accepted drought-tolerant varieties,resulting in the development of several drought-tolerant rice varieties through marker-assisted selection and genetically engineered *** review provides up-to-date information on proof-of-concept genes and breeding methods in the molecular breeding era,offering guidance for rice breeders to develop drought-tolerant rice varieties.

关键词： conventional breeding drought stress drought tolerant rice genetic engineering marker-assisted selection breeding

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Research on Low Sampling Rate Digital Pre-distortion Technology Based on Improved Chebyshev Polynomial

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Instrumentation 2023年第2期10卷 57-66页

作者： LU Xu ZHOU Xianchun ZHANG Ying ye yuxuan School of Electronic and Information Engineering Nanjing University of Information Science and TechnologyNanjing 210044 School of Artificial Intelligence Nanjing University of Information Science and TechnologyNanjing 210044

This paper presents a low sampling rate digital pre-distortion technique based on an improved Chebyshev polynomial for the non-linear distortion problem of amplifiers in 5G broadband communication *** improved Chebyshev polynomial is used to construct the behavioural model of the broadband amplifier,and an undersampling technique is used to sample the output signal of the amplifier,reduce the sampling rate,and extract the pre-distortion parameters from the sampled signal through an indirect learning structure to finally correct the non-linearity of the amplifier *** technique is able to improve the linearity and efficiency of the power amplifier and provides better *** results show that by constructing the behavioural model of the amplifier using memory polynomials(MP),generalised polynomials(GMP)and modified Chebyshev polynomials respectively,the adjacent channel power ratio of the obtained system can be improved by more than 13.87d B,17.6dB and 19.98dB respectively compared to the output signal of the amplifier without digital *** Chebyshev polynomial improves the neighbourhood channel power ratio by 6.11dB and 2.38dB compared to the memory polynomial and generalised polynomial respectively,while the normalised mean square error is effectively improved and *** shows that the improved Chebyshev pre-distortion can guarantee the performance of the system and improve the non-linearity better.

关键词： Digital Pre-distortion Improved Chebyshev Polynomials Undersampling Techniques Indirect Learning Structures

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Research on Facial Fatigue Detection of Drivers with Multi-feature Fusion

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Instrumentation 2023年第1期10卷 23-31页

作者： ye yuxuan ZHOU Xianchun WANG Wenyan YANG Chuanbin ZOU Qingyu School of Electronic and Information Engineering Nanjing University of Information Science and TechnologyNanjing 210044 School of Artificial Intelligence(School of Future Technology) Nanjing University of Information Science and TechnologyNanjing 210044

In order to solve the shortcomings of current fatigue detection methods such as low accuracy or poor real-time performance,a fatigue detection method based on multi-feature fusion is ***,the HOG face detection algorithm and KCF target tracking algorithm are integrated and deformable convolutional neural network is introduced to identify the state of extracted eyes and mouth,fast track the detected faces and extract continuous and stable target faces for more efficient *** the head pose algorithm is introduced to detect the driver’s head in real time and obtain the driver’s head state ***,a multi-feature fusion fatigue detection method is proposed based on the state of the eyes,mouth and *** to the experimental results,the proposed method can detect the driver’s fatigue state in real time with high accuracy and good robustness compared with the current fatigue detection algorithms.

关键词： HOG Face Posture Detection Deformable Convolution Multi-feature Fusion Fatigue Detection

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Activated carbon fiber mediates efficient activation of peroxymonosulfate systems:Modulation of manganese oxides and cycling of manganese species

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Chinese Chemical Letters 2023年第12期34卷 275-280页

作者： Lixi Xiao Yuwei Deng Huo Zhou Fengjun Lu Chong Ke yuxuan ye Xuanyuan Pei Dongsheng Xia Fei Pan School of Environmental Engineering Wuhan Textile UniversityWuhan 430200China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile UniversityWuhan 430200China

Manganese oxides show a strong catalytic activity in the peroxymonosulfate(PMS)advanced oxidation process but have poor chemical stability and a propensity to cause the aggregation of ***,a novel composite material(abbreviated as MnO_(x)@ACF)was synthesized,characterized,and *** carbon fiber(ACF)was selected as a carrier,which modulated the composition of manganese *** results showed that MnO_(x)@ACF had a strong adsorption ability and successfully activated PMS to degrade tetracycline hydrochloride(TCH),with a removal eficiency of 89.0%in 30 *** factors such as pH and coexisting ion species were investigated,and a five-cycle test was *** oxygen(^(1)O_(2))was predominated in the MnO_(x)@ACF/PMS system.A possible explanatory pathway of TCH was proposed based on the results of the high performance liquid chromatography-mass *** was concluded that this study provides a novel insight into the activation of PMS for the degradation of organic matter by carbon-loaded multivalent manganese oxides.

关键词： Activated carbon fiber Mn_(3)O_(4) MnO_(2) Singlet oxygen

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Non-woven cotton fabric based intimately coupling of photocatalysis and biodegradation system for efficient removal of Cu(Ⅱ)complex in water

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Chinese Chemical Letters 2022年第6期33卷 3127-3132页

作者： yuxuan ye Peng Yang Yuwei Deng yezhi Yang Kun Zhang Yueying Wang Wenjing Shang Qiang Li Lei Sun Fei Pan Dongsheng Xia School of Environmental Engineering Wuhan Textile UniversityWuhan 430073China Engineering Research Center for Clean Production of Textile Dyeing and Printing Ministry of EducationWuhan 430073China

The efficient remediation of heavy metal complexes in water has become a difficult and challenging task owing to their high stability and strong *** this study,a novel strategy was employed for highly efficient removal of Cu-citrate by using intimately coupled photocatalysis and biodegradation(ICPB)system with non-woven cotton fabric as a *** results showed that the ICPB system caused94%Cu removal,which was higher than those of single *** 5 cycles,Cu removal efficiency could still reach 78%within 5 *** existence of 0–40 mg/L citrate had negligible influence,whereas the presence of 60–100 mg/L citrate exhibited a limited adverse effect on Cu removal(~70%).The decomplexation of Cu-citrate was realized via the function of free radicals and *** main processes,such as bio-adsorption of Cu^(2+) by microorganisms,deposition of Cu^(0) on the surface of material,played important role in Cu removal from aqueous *** dominant microorganisms in the system were Proteobacteria,Actinobacteria,Bacteroidetes,Chloroflexi,Chlorophyta,Planctomycetes,and ***,the performance of ICPB system was also validated through treatment of other heavy metal *** study provided a feasible strategy for the decontamination of heavy metal complexes in wastewater.

关键词： Cu complex Photocatalysis Biological treatment Non-woven cotton fabric

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Efficient removal of tetracycline in water by a novel chemical and biological coupled system with non-woven cotton fabric as carrier

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Chinese Chemical Letters 2021年第9期32卷 2823-2827页

作者： Peng Yang yuxuan ye Zidu Yan Qiang Li Kun Zhang yezhi Yang Qiuyue Zhang Hang Yin Dongsheng Xia Fei Pan School of Environmental Engineering Wuhan Textile UniversityWuhan 430073China Engineering Research Center for Clean Production of Textile Dyeing and Printing Ministry of EducationWuhan 430073China

As a novel wastewater treatment strategy,the intimate coupling of photocatalysis and biodegradation(ICPB)has been attracted attention,which is ascribed to its combination of the advantages of photocatalytic reactions and biological *** selection of carriers is important since it affects the stability of the system and the removal efficiency of *** this study,a novel ICPB system was successfully constructed by loading photocatalytic materials(i.e.,TiO_(2),N-TiO_(2),and Ag-TiO_(2))and microbes onto non-woven cotton *** photocatalysts were characterized by scanning electron microscope-energy dispersive spectrometer(SEM-EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).This system exhibited good performance in degrading tetracycline(TC)in *** results showed that Ag-TiO_(2)-ICPB had the maximum removal efficiency of tetracycline(94.7%)in 5 h,which was 16.5%higher than the photocatalysis *** five cycles,82.9%of tetracycline could be still degraded through Ag-TiO_(2)-*** spectrum showed microbes on the material changed little before and after the *** result implied the materials were stable,and then beneficial for degrading of pollutants *** intermediates were detected through ultraperformance liquid chromatography-mass spectrometer(UPLC-MS)and the plausible degradation pathways were *** paramagnetic resonance(EPR)analysis showed·OH and O_(2)·-were the main reactive oxygen species for TC *** conclusion,the ICPB system with non-woven cotton fabric as a carrier has certain application prospects for antibiotic-containing wastewater.

关键词： Photocatalysis Biological treatment ICPB Non-woven cotton fabric Tetracycline removal

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Parametric Analysis and Designing Maps for Powder Spreading in Metal Additive Manufacturing

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Computer Modeling in Engineering & Sciences 2025年第2期142卷 2067-2090页

作者： yuxuan Wu Sirish Namilae Department of Aerospace Engineering Embry-Riddle Aeronautical UniversityDaytona BeachFL 32114USA

Powder bed fusion(PBF)in metallic additive manufacturing offers the ability to produce intricate geometries,high-strength components,and reliable ***,powder processing before energy-based binding significantly impacts the final product’s *** maps guide efficient process design to minimize defects,but creating them through experimentation alone is challenging due to the wide range of parameters,necessitating a comprehensive computational parametric *** this study,we used the discrete element method to parametrically analyze the powder processing design space in PBF of stainless steel 316L *** lattice parameter sweeps are often used for parametric analysis,but are computationally *** find that non-uniform parameter sweep based on the low discrepancy sequence(LDS)algorithm is ten times more efficient at exploring the design space while accurately capturing the relationship between powder flow dynamics and bed packing *** introduce a multi-layer perceptron(MLP)model to interpolate parametric causalities within the LDS parameter *** over 99%accuracy,it effectively captures these causalities while requiring fewer ***,we generate processing design maps for machine setups and powder selections for efficient process *** find that recoating speed has the highest impact on powder processing quality,followed by recoating layer thickness,particle size,and inter-particle friction.

关键词： Powder bed fusion additive manufacturing discrete element method parameter sweep process design

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The shadow and gamma-ray bursts of a Schwarzschild black hole in asymptotic safety

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Communications in Theoretical Physics 2025年第2期77卷 121-131页

作者： yuxuan Shi Hongbo Cheng Department of Physics East China University of Science and Technology The Shanghai Key Laboratory of Astrophysics

The effects and rules of the dimensionless parameter ξ on neutrino annihilation v+■→e-+e+dominated gamma-ray bursts are analysed and investigated within the context of black holes in asymptotic *** also computationally model photon orbits around black holes,as photons and neutrinos have the same geodesic equations near black *** show that the black hole shadow radius decreases with increasing ξ.Calculations are made to determine the temperature of the accretion disk surrounding the black hole and the ratio ■Newtof energy deposition per unit time and compared to that of the Newtonian *** accretion disk temperature peaks at a higher temperature due to quantum gravity corrections,which increases the probability of neutrino emission from the black *** is interesting to note that larger quantum gravity effects cause the ratio value to significantly *** the neutrinoantineutrino annihilation process,the energy deposition rate is sufficient even while the energy conversion is inhibited because of quantum ***-ray bursts might originate from the corrected annihilation ***,we examine the derivative d■/dr about the star radius *** findings demonstrate that the ratio is lowered by the black hole's quantum *** neutrino pair annihilation grows weaker the more prominent the influence of quantum gravity.

关键词： quantum gravity black hole gamma-ray burst

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Cross-subcarrier precoder design for massive MIMO-OFDM downlink with symplectic optimization

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Science China(Information Sciences) 2025年第2期68卷 216-229页

作者： yuxuan ZHANG An-An LU Xiang-Gen XIA Xiqi GAO National Mobile Communications Research Laboratory Southeast University Purple Mountain Laboratories Department of Electrical and Computer Engineering University of Delaware

We propose a cross-subcarrier precoder design(CSPD) for massive multiple-input multiple-output(MIMO) orthogonal frequency division multiplexing(OFDM) downlink. This work aims to significantly improve the channel estimation and signal detection performance by enhancing the smoothness of the frequency domain effective channel. This is accomplished by designing a few vectors known as the transform domain precoding vectors(TDPVs), which are then transformed into the frequency domain to generate the precoders for a set of subcarriers. To combat the effect of channel aging, the TDPVs are optimized under imperfect channel state information(CSI). The optimal precoder structure is derived by maximizing an upper bound of the ergodic weighted sum-rate(WSR) and utilizing the a posteriori beam-based statistical channel model(BSCM). To avoid the large-dimensional matrix inversion, we propose an algorithm with symplectic optimization. Simulation results indicate that the proposed cross-subcarrier precoder design significantly outperforms conventional methods.

关键词： massive MIMO-OFDM cross subcarrier precoder design transform domain precoding vectors effective channel symplectic optimization

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