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Virtual Simulation System with Path-following Control for Lunar Rovers Moving on Rough Terrain

Chinese Journal of Mechanical Engineering 2012年第1期25卷 38-46页

作者： GAO Haibo DENG Zongquan DING Liang wang mengyu State Key Laboratory of Robotics and Systems Harbin Institute of TechnologyHarbin 150001China School of Mechatronics Harbin Institute of TechnologyHarbin 150001China

Virtual simulation technology is of great importance for the teleoperation of lunar rovers during the exploration phase, as well as the design of locomotion systems, performance evaluation, and control strategy verification during the R&D phase. The currently used simulation methods for lunar rovers have several disadvantages such as poor fidelity for wheel-soil interaction mechanics, difficulty in simulating rough terrains, and high complexity making it difficult to realize mobility control in simulation systems. This paper presents an approach for the construction of a virtual simulation system that integrates the features of 3D modeling, wheel-soil interaction mechanics, dynamics analysis, mobility control, and visualization for lunar rovers. Wheel-soil interaction experiments are carried out to test the forces and moments acted on a lunar rover’s wheel by the soil with a vertical load of 80 N and slip ratios of 0, 0.03, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.6. The experimental results are referenced in order to set the parameters’ values for the PAC2002 tire model of the ADAMS/Tire module. In addition, the rough lunar terrain is simulated with 3DS Max software after analyzing its characteristics, and a data-transfer program is developed with Matlab to simulate the 3D reappearance of a lunar environment in ADAMS. The 3D model of a lunar rover is developed by using Pro/E software and is then imported into ADAMS. Finally, a virtual simulation system for lunar rovers is developed. A path-following control strategy based on slip compensation for a six-wheeled lunar rover prototype is researched. The controller is implemented by using Matlab/Simulink to carry out joint simulations with ADAMS. The designed virtual lunar rover could follow the planned path on a rough terrain. This paper can also provide a reference scheme for virtual simulation and performance analysis of rovers moving on rough lunar terrains.

关键词： lunar rover comprehensive simulation system rough terrain wheel-soil interaction mechanics path-following control

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Contribution of plant traits to the explanation of temporal variations in carbon and water fluxes in semiarid grassland patches

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Journal of Plant Ecology 2020年第6期13卷 773-784页

作者： mengyu wang Nan Lu Qinglin Li Weiwei Fang Bojie Fu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China College of Forestry and Biotechnology Zhejiang Agriculture and Forestry UniversityHangzhou 311300China Key Research Institute of Yellow River Civilization and Sustainable Development Henan UniversityKaifeng 475001China School of Natural Resources Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China

Aims Accurate prediction of spatiotemporal variations in carbon and water fluxes of heterogeneous landscape is critical to comprehensively address the effects of climate change and vegetation dynamics on landscape and regional carbon and water *** A field study was conducted to characterize the seasonal variations in gas fluxes and explore their relationships with abiotic and biotic factors in a small grassland *** carbon and water fluxes including net ecosystem exchange,gross ecosystem productivity,ecosystem respiration and evapotranspiration(ET)were measured for three types of grassland patches over a growing season using the closed chamber *** key plant trait variables were measured,based on which community weighted mean(CWM)and functional variance(FDvar)were *** Findings The results showed that the temporal variations in the carbon and water fluxes were regulated by meteorological,soil and community functional *** of the CWM and FDvar of plant trait measures greatly improved the degree of explanation of the predict *** leaf area and leafδ^(13)C content(Lδ^(13)C)were the most important trait variables in affecting the variations of the gas *** indices had greater importance than FDvar indices in predicting the variation of the C fluxes but FDvar indices were more important for ET than C *** findings demonstrated that mass ratio hypothesis and the complementary effects hypothesis are not mutually exclusive but have different relative importance for different ecosystem *** functional traits played important roles in predicting the spatiotemporal variations of carbon and water fluxes in semiarid grassland.

关键词： plant functional trait functional diversity carbon and water fluxes semiarid area Loess Plateau

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UV-B irradiation enhances the accumulation of beneficial glucosinolates induced by melatonin in Chinese kale sprout

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Horticultural Plant Journal 2024年第4期10卷 995-1006页

作者： mengyu wang Jiansheng wang Yuhe Yang Zhiqing Li Ghazala Mustafa Yubo Li Lihong Liu Zuofa Zhang Qiaomei wang Zhejiang Academy of Agricultural Sciences HangzhouZhejiang 310021China Key Laboratory of Horticultural Plant Growth Development and Quality ImprovementMinistry of AgricultureDepartment of HorticultureZhejiang UniversityHangzhouZhejiang 310058China Department of Plant Sciences Quaid-i-Azam UniversityIslamabad 45320Pakistan

Cruciferous sprout is a new form of vegetable product rich in bioactive compounds,especially *** studies have focused on increasing the accumulation of glucosinolates in cruciferous sprouts by applying different chemical regulators,with a particular focus on their contribution to nutritional quality and health ***,the effects of melatonin and UV-B irradiation on glucosinolate biosynthesis remain *** this study,it was found that changes in melatonin concentrations significantly affected the contents of individual as well as total aliphatic and indolic *** 5μmol·L^(-1)melatonin was decided as the optimum concentration that could increase the content of beneficial glucosinolates including glucoraphanin and 4-methoxy glucobrassicin in Chinese kale ***,the enhancement of glucosinolate accumulation by melatonin treatment could be further amplified by UV-B ***,our results showed that R2R3-MYB transcription factor BoaMYB28 and BoaMYB51,which are central regulators of aliphatic and indolic glucosinolate biosynthesis respectively,were both involved in the regulation of glucosinolate biosynthesis by melatonin and UV-B ***,the expression of glucosinolate biosynthetic genes,including BoaCYP79F1,BoaCYP83A1,BoaSUR1,BoaUGT74B1,BoaCYP79B2,BoaCYP79B3,and BoaCYP83B1 participated in the formation of core structures and BoaFMOGS-OX5,BoaAOP2,BoaCYP81F2,and BoaIGMT1 involved in the sidechain modification of aliphatic and indolic glucosinolate,was regulated by melatonin or UV-B *** together,these findings provide a potential strategy for improving the nutritional quality and resistance of Chinese kale sprouts.

关键词： Melatonin Chinese kale sprouts UV-B Glucosinolates Nutritional quality Second metabolism

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Brassinosteroids fine-tune secondary and primary sulfur metabolism through BZR1-mediated transcriptional regulation

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Journal of Integrative Plant Biology 2023年第5期65卷 1153-1169页

作者： mengyu wang Congxi Cai Yubo Li Han Tao Fanliang Meng Bo Sun Huiying Miao Qiaomei wang Department of Horticulture Key Laboratory of Horticultural Plant GrowthDevelopment and Quality improvementMinistry of AgricultureZhejiang UniversityHangzhou 310058China School of Horticulture and Landscape Architecture Yangzhou UniversityYangzhou 221116China Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang Province Zhejiang Academy of Agricultural SciencesHangzhou 310021China College of Horticulture Sichuan Agricultural UniversityChengdu 611130China

For adaptation to ever-changing environments,plants have evolved elaborate metabolic systems coupled to a regulatory network for optimal growth and defense. Regulation of plant secondary metabolic pathways such as glucosinolates(GSLs) by defense phytohormones in response to different stresses and nutrient deficiency has been intensively investigated, while how growth-promoting hormone balances plant secondary and primary metabolism has been largely unexplored. Here, we found that growth-promoting hormone brassinosteroid(BR) inhibits GSLs accumulation while enhancing biosynthesis of primary sulfur metabolites, including cysteine(Cys) and glutathione(GSH) both in Arabidopsis and Brassica crops, fine-tuning secondary and primary sulfur metabolism to promote plant growth. Furthermore, we demonstrate that of BRASSINAZOLE RESISTANT 1(BZR1), the central component of BR signaling, exerts distinct transcriptional inhibition regulation on indolic and aliphatic GSL via direct MYB51 dependent repression of indolic GSL biosynthesis, while exerting partial MYB29 dependent repression of aliphatic GSL biosynthesis. Additionally, BZR1 directly activates the transcription of APR1 and APR2 which encodes rate-limiting enzyme adenosine 5′-phosphosulfate reductases in the primary sulfur metabolic *** summary, our findings indicate that BR inhibits the biosynthesis of GSLs to prioritize sulfur usage for primary metabolites under normal growth *** findings expand our understanding of BR promoting plant growth from a metabolism perspective.

关键词： brassinosteroids BZR1 glucosinolates plant growth primary sulfur metabolites secondary sulfur metabolites

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Multi-task Learning of Semantic Segmentation and Height Estimation for Multi-modal Remote Sensing Images

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Journal of Geodesy and Geoinformation Science 2023年第4期6卷 27-39页

作者： mengyu wang Zhiyuan YAN Yingchao FENG Wenhui DIAO Xian SUN Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100190China Key Laboratory of Network Information System Technology(NIST) Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100190China

Deep learning based methods have been successfully applied to semantic segmentation of optical remote sensing ***,as more and more remote sensing data is available,it is a new challenge to comprehensively utilize multi-modal remote sensing data to break through the performance bottleneck of single-modal *** addition,semantic segmentation and height estimation in remote sensing data are two tasks with strong correlation,but existing methods usually study individual tasks separately,which leads to high computational resource *** this end,we propose a Multi-Task learning framework for Multi-Modal remote sensing images(MM_MT).Specifically,we design a Cross-Modal Feature Fusion(CMFF)method,which aggregates complementary information of different modalities to improve the accuracy of semantic segmentation and height ***,a dual-stream multi-task learning method is introduced for Joint Semantic Segmentation and Height Estimation(JSSHE),extracting common features in a shared network to save time and resources,and then learning task-specific features in two task *** results on the public multi-modal remote sensing image dataset Potsdam show that compared to training two tasks independently,multi-task learning saves 20%of training time and achieves competitive performance with mIoU of 83.02%for semantic segmentation and accuracy of 95.26%for height estimation.

关键词： multi-modal multi-task semantic segmentation height estimation convolutional neural network

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Recent progress of diversiform humidity sensors based on versatile nanomaterials and their prospective applications

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Nano Research 2023年第10期16卷 11938-11958页

作者： Dongzhi Zhang mengyu wang Mingcong Tang Xiaoshuang Song Xixi Zhang Zhanjia Kang Xiaohua Liu Jianhua Zhang Qingzhong Xue State Key Laboratory of Heavy Oil Processing College of Control Science and EngineeringChina University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Heavy Oil Processing School of Materials Science and EngineeringChina University of Petroleum(East China)Qingdao 266580China

Humidity sensors are of significance in various fields,such as environmental and food quality monitoring,industrial processing,wearable and flexible electronics,and human health ***-performance humidity sensors with high sensitivity,rapid response time,and good stability are of paramount importance in humidity *** this paper,diversiform humidity sensors with different sensing mechanisms are summarized,including resistive,impedance,capacitive,quartz crystal microbalance(QCM),surface acoustic wave(SAW),field-effect transistor(FET),and optical fiber humidity *** nanomaterials such as graphene,transition-metal chalcogenide,MXenes,black phosphorus(BP),boron nitride(BN),polymers,and nanofibers were promising building-blocks for constructing humidity *** latest progress in the wearable and flexible humidity sensors,and self-powered humidity sensors was *** diversiform applications of the humidity sensors with great prospects were demonstrated in various fields in terms of human respiratory monitoring,skin dryness diagnosing,fingertip approaching,and non-contact ***,the challenges and prospects of nanomaterials-based humidity sensors were discussed.

关键词： humidity sensors nanomaterials wearable humidity sensors self-powered humidity sensors human respiratory monitoring

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The Analysis of Using MGGH in Flue Gas Desulphurization (FGD) System in Cement Plant

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Journal of Geoscience and Environment Protection 2019年第10期7卷 155-160页

作者： mengyu wang Hefei Cement Research & Design Institute Corporation Ltd. Hefei China

The paper first introduces the background and the mechanism of secondary pollution from desulfurization in cement plant. Then, take plant A as an example, using MGGH (media gas-gas heater) to control “white smoke”. MGGH uses heat medium water to heat transfer between the original flue gas and the clean flue gas, without additional heat source, and has obvious economic benefits, which is the inevitable development direction of desulfurization reform of cement kiln system in the future.

关键词： MGGH Cement Plant Flue Gas Desulphurization “White Smoke”

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WRKY33-mediated indolic glucosinolate metabolic pathway confers resistance against Alternaria brassicicola in Arabidopsis and Brassica crops

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Journal of Integrative Plant Biology 2022年第5期64卷 1007-1019页

作者： Han Tao Huiying Miao Lili Chen mengyu wang Chuchu Xia Wei Zeng Bo Sun Fen Zhang Shuqun Zhang Chuanyou Li Qiaomei wang Department of Horticulture Zhejiang UniversityHangzhou 310058ZhejiangChina State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro‐products Key Laboratory of Biotechnology in Plant Protection of Ministry of Agriculture and Zhejiang ProvinceInstitute of Virology and BiotechnologyZhejiang Academy of Agricultural SciencesHangzhou 310021China College of Horticulture Sichuan Agricultural UniversityChengdu 611130China Division of Biochemistry Interdisciplinary Plant GroupUniversity of MissouriColumbia 65211MissouriUSA State Key Laboratory of Plant Genomics National Centre for Plant Gene Research(Beijing)Institute of Genetics and Developmental Biologythe Chinese Academy of SciencesBeijing 100101China

The tryptophan(Trp)-derived plant secondary metabolites,including camalexin,4-hydroxyindole-3-carbonylnitrile,and indolic glucosinolate(IGS),show broad-spectrum antifungal ***,the distinct regulations of these metabolic pathways among different plant species in response to fungus infection are rarely *** this study,our results revealed that WRKY33 directly regulates IGS biosynthesis,notably the production of 4-methoxyindole-3-ylmethyl glucosinolate(4MI3G),conferring resistance to Alternaria brassicicola,an important pathogen which causes black spot in Brassica ***33 directly activates the expression of CYP81F2,IGMT1,and IGMT2 to drive sidechain modification of indole-3-ylmethyl glucosinolate(I3G)to 4MI3G,in both Arabidopsis and Chinese kale(Brassica oleracea *** Bailey).However,Chinese kale showed a more severe symptom than Arabidopsis when infected by Alternaria *** analyses of the origin and evolution of Trp metabolism indicate that the loss of camalexin biosynthesis in Brassica crops during evolution might attenuate the resistance of crops to Alternaria *** a result,the IGS metabolic pathway mediated by WRKY33 becomes essential for Chinese kale to deter Alternaria *** results highlight the differential regulation of Trp-derived camalexin and IGS biosynthetic pathways in plant immunity between Arabidopsis and Brassica crops.

关键词： Alternaria brassicicola glucosinolate plant defense secondary metabolism WRKY33

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WRKY33 negatively regulates anthocyanin biosynthesis and cooperates with PHR1 to mediate acclimation to phosphate starvation

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Plant Communications 2024年第5期5卷 134-147页

作者： Han Tao Fei Gao Linying Li Yuqing He Xueying Zhang mengyu wang Jia Wei Yao Zhao Chi Zhang Qiaomei wang Gaojie Hong State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products Key Laboratory of Biotechnology in Plant Protection of the MOA of China and Zhejiang ProvinceInstitute of Virology and BiotechnologyZhejiang Academy of Agricultural SciencesHangzhou 310021China State Key Laboratory of Subtropical Silviculture Zhejiang Provincial Key Laboratory of Resources Protection and Innovation of Traditional Chinese MedicineZhejiang A&F UniversityHangzhou 311300China Department of Horticulture College of Agriculture and BiotechnologyZhejiang UniversityKey Laboratory of Horticultural Plant GrowthDevelopment and Quality ImprovementMinistry of AgricultureHangzhouZhejiangChina Institute of Sericulture and Tea Zhejiang Academy of Agricultural SciencesHangzhou 310000China

Anthocyanin accumulation is acknowledged as a phenotypic indicator of phosphate(Pi)***,negative regulators of this process and their molecular mechanisms remain largely *** this study,we demonstrate that WRKY33 acts as a negative regulator of phosphorus-status-dependent anthocyanin ***33 regulates the expression of the gene encoding dihydroﬂavonol 4-reductase(DFR),a rate-limiting enzyme in anthocyanin production,both directly and ***33 binds directly to the DFR promoter to repress its expression and also interferes with the MBW complex through interacting with PAP1 to indirectly inﬂuence DFR transcriptional ***�Pi conditions,PHR1 interacts with WRKY33,and the protein level of WRKY33 decreases;the repression of DFR expression by WRKY33 is thus attenuated,leading to anthocyanin accumulation in *** genetic and biochemical assays suggest that PHR1 is also involved in regulating factors that affect WRKY33 protein *** together,ourfindings reveal that Pi starvation represses WRKY33,a repressor of anthocyanin biosynthesis,tofinely tune anthocyanin ***‘‘double-negative logic’’regulation of phosphorus-status-dependent anthocyanin biosynthesis is required for the mainte-nance of plant metabolic homeostasis during acclimation to Pi starvation.

关键词： WRKY33 phosphate signaling PHR1 Arabidopsis thaliana anthocyanins

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Degradation of ciprofloxacin hydrochloride in a multiphase mixed system by subaquatic gas-liquid discharge plasma

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Plasma Science and Technology 2024年第11期26卷 144-151页

作者： mengyu wang Jianping LIANG Ke LU Zikai ZHOU Qinghua LIU Hao YUAN Wenchun wang Dezheng YANG Key Laboratory of Materials Modification by Laser Ion and Electron BeamsMinistry of EducationDalian 116024People’s Republic of China

In recent years, antibiotic pollution has become a serious threat to human health. In this study, a gas-liquid discharge plasma is developed to degrade ciprofloxacin hydrochloride in a multiphase mixed system containing inorganic and organic impurities. The discharge characteristics are analyzed by diagnosing the applied voltage and discharge current waveforms, as well as the optical emission spectra. The work investigates how degradation efficiency is affected by applied voltage, gas flow rate, treatment time, initial concentration as well as the addition of γ-Al_(2)O_(3) pellets and peanut straw. After 70 min, the degradation efficiency of ciprofloxacin hydrochloride in the multiphase mixed system reached 99.6%. Its removal efficiency increases as the initial concentration decreases and the applied voltage increases. Besides, there is still a good degradation efficiency of ciprofloxacin hydrochloride with the addition of peanut *** degradation mechanism of ciprofloxacin hydrochloride is investigated through the analysis of degraded intermediates and reactive species.

关键词： antibiotic gas-liquid discharge multiphase mixed system ciprofloxacin hydrochloride degradation

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