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油茶花苞采集机械手的设计与试验

农机化研究 2025年第1期47卷 46-53页

作者：赵青李立君吴泽超李骏郭鑫中南林业科技大学机电工程学院长沙410004

丘陵地区油茶林地众多,油茶花苞采集暂无机械化设备,故设计了一款六自由度的油茶花苞采集机械手。通过油茶花苞生物学特性分析,使用旋扭式末端执行器可以实现油茶花苞的高效采集,采净率为90%。通过机械手工作空间分析,确定了机械手的尺... 详细信息

丘陵地区油茶林地众多,油茶花苞采集暂无机械化设备,故设计了一款六自由度的油茶花苞采集机械手。通过油茶花苞生物学特性分析,使用旋扭式末端执行器可以实现油茶花苞的高效采集,采净率为90%。通过机械手工作空间分析,确定了机械手的尺寸,并将末端执行器搭载到机械手上进行了油茶林田间试验。试验结果表明:搭载了旋扭式末端执行器六自由度机械手,可以到达采摘区间的边界位置,末端在x、y、z方向的最大偏差分别为3.4、3.3、3.4 cm,为油茶花苞智能化采集提供了依据。

关键词：采集机械手生物学特性末端执行器油茶花苞

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Plant Diversity 2019年第4期41卷 250-257页

作者： Aysajan Abdusalam qing jun Li College of Life and Geographic Sciences Kashi UniversityKashi.Xinjiang844000PR China The Key Laboratory of Ecology and Biological Resources in Yarkand Oasis Under the Department of Education of Xinjiang Uygur Autonomous Region Kashi University.KashiXinjiang844000PR China Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical BotanicalCarden.Chinese Academy of SciencesMenglun Town666303PR China Laboratory of Ecology and Evolutionary Biology.Yunnan University KunmingYunnan650091PR China

The population characteristics of distylous species are highly sensitive to stochastic natural selection ***,populations growing under different environmental conditions may vary in floral morph ratios,potentially affecting female fitness and leading to inbreeding ***,the variation in offspring quality among populations as a result of inbreeding depression is poorly understood in distylous *** study investigates variations in plant density,seed mass,seed viabilityfemale fitness,and post-dispersal inbreeding depression in both sexual morphs(long-styled and shortstyled plants)of the distylous Primula nivalis that were subjected to different pollination treatments along an elevational gradient from 1657 to 2704 m *** characteristics(morph plant density and ratio)and fruit set were significantly affected by sexual morph and *** density and fruitset frequencies were lower for short-styled than for long-styled plants at 2704 m *** seeds from the cross-pollinated flowers of both morphs were higher in quality than those of self-pollinated *** female fitness of seeds from cross-pollinated flowers of both morphs was higher than that of seeds from open-pollinated and self-pollinated *** female fitness of seeds from long-styled flowers was higher than that of seeds from short-styled flowers at all *** depression increased with elevation among plants with short-styled flowers but not among those with long-styled *** in the elevation-dependent mating system might influence female fitness and affect inbreeding depression in both floral *** conclusion,the low quality of seeds from short-styled flowers at high elevations might decrease short-styled flower frequency,affecting population characteristics.

关键词： Inbreeding depression Pollination treatment Seed mass Seed quality

Influence of reaction piles on test pile response in a static load test

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 198-205页

作者： Qian-qing ZHANG Shu-cai LI Zhong-miao ZHANG Geotechnical and Structural Engineering Research Center Shandong University MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University

This work presents a new analytical method to analyze the influence of reaction piles on the test pile response in a static load *** our method,the interactive effect between soil and pile is simulated using independent springs and the shear displacement method is adopted to analyze the influence of reaction piles on test pile ***,the influence of the sheltering effect between reaction piles and test pile on the test pile response is taken into *** cases are analyzed to verify the rationality and efficiency of the present *** method can be easily extended to a nonlinear response of an influenced test pile embedded in a multilayered soil,and the validity is also demonstrated using centrifuge model tests and a computer program presented in the *** present analyses indicate that the proposed method will lead to an underestimation of the test pile settlement in a static load test if the influence of the presence of reaction piles on the test pile response is neglected.

关键词： Test pile Reaction pile Shear displacement method Sheltering effect Multilayered soil

Modulation of protein expression in alfalfa (Medicago sativa L.) root and leaf tissues by Fusarium proliferatum

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Journal of Integrative Agriculture 2017年第11期16卷 2558-2572页

作者： CONG Li-li SUN Yan LONG Rui-cai KANG jun-mei ZHANG Tie-jun LI Ming-na WANG Zhen YANG qing-chuan Institute of Animal Sciences Chinese Academy of Agricultural Science Beijing 100193 P.R. China Institute of Grassland Science China Agricultural University Beijing 100193 P.R. China College of Animal Science and Technology Qingdao Agricultural University Qingdao 266109 P.R. China

Alfalfa （Medicago sativa L.） is an important forage crop and is also a target of many fungal diseases including Fusarium spp. As of today, very little information is available about molecular mechanisms that contribute to pathogenesis and defense responses in alfalfa against Fusarium spp. and specifically against Fusarium proliferatum, the causal agent of alfalfa root rot. In this study, we used a proteomic approach to identify inducible proteins in alfalfa during a compatible interaction with F. proliferatum strain YQC-LI. Samples used for the two-dimensional gel electrophoresis （2-DE） and MALDI-TOF/TOF mass spectrometry were from roots and leaves of alfalfa cultivar AmeriGraze 401＋Z and WL656HQ. Plants were grown in hydroponic conditions and at 4 days post inoculation with YQC-LI. Our disease symptom assays indicated thatAmeriGraze 401＋Z was tolerant to YQC-L1 infection while WL656HQ was highly susceptible. Analysis of differentially expressed proteins found in the 2-DE was further characterized using the MASCOT MS/MS ion search software and associated databases to identify multiple proteins that might be involved in F. proliferatum resistance. A total of 66 and 27 differentially expressed proteins were found in the roots and leaves of the plants inoculated with YQC-L1, respectively. These identified proteins were placed in various categories including defense and stress response related metabolism, photosynthesis and protein synthesis. Thirteen identified proteins were validated for their expressions by quantitative reverse transcription （qRT）-PCR. Our results suggested that some of the identified proteins might play important roles in alfalfa resistance against Fusarium spp. These finding could facilitate further dissections of molecular mechanisms controlling root rot disease in alfalfa and potentially other legume crops.

关键词： alfalfa proteome 2-DE mass spectrometry Fusarium proliferatum

In vivo and in vitro anti-sepsis effects of physcion 8-O-β- glu- copyranoside extracted from Rumexjaponicus

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Chinese Journal of Natural Medicines 2017年第7期15卷 534-539页

作者： FU Wei-jun TANG Jian-jun WANG Hui WEI Hong-Yun cai Shu-Min ZENG Zhen-Hua CHEN Hui CHEN Zhong-qing Department of Intensive Care Medicine Nanfang Hospital Southern Medical University Guangzhou 510515 China Department of Anesthesiology Nan fang Hospital Southern Medical University Guangzhou 510515 China Department of Plastic and Reconstructive Surgery Nanfang Hospital Southern Medical University Guangzhou 510515 China

The present study was designed to investigate the anti-sepsis effects of physcion 8-O-β-glucopyranoside (POG) isolated from Rumex japonicas and explore its possible pharmacological mechanisms. POG was extracted from R. japonicas by bioactivity-guided isolation with the anti-sepsis agents. Survival analysis in septic mouse induced by LPS and heat-killed Escherichia coli were used to evaluate the protective effect of POG(40 mg·kg^(-1), i.p.) on sepsis. Cytokines including TNF-α, IL-1β and IL-6 in RAW 264.7 cells induced by LPS(100 ng·mL^(-1)) were determined by ELISA. In addition, the proteins expressions of TLR2 and TLR4 were determined by Western blotting assay. Our results demonstrated that POG(40 mg·kg^(-1), i.p.) possessed significant protective activity on the endotoxemic mice. The POG treatment(20, 40, and 80 μg·mL^(-1)) significantly decreased the TNF-α, IL-1β and IL-6 induced by LPS(P < 0.01) in a concentration-dependent manner. Furthermore, the TLR4 and TLR2 proteins were also down-regulated by POG at 20(P < 0.01), 40(P < 0.01), and 80 μg·mL^(-1)(P < 0.01). The present study demonstrated that the POG extracted from R. japonicas possessed significant anti-sepsis effect on endotoxemic mice, and can be developed as a novel drug for treating sepsis in the future.

关键词： Anti-sepsis TLR-4 TLR-2 Pro-inflammatory cytokines LPS

Effect of reduction pretreatment process on evolution of micro-porosity in 42CrMo billet

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Journal of Iron and Steel Research International 2021年第4期28卷 413-423页

作者： Zhen Ning Wei Yu Hong-qiang Liu qing-wu cai Collaborative Innovation Centre of Steel Technology University of Science and Technology BeijingBeijing 100083China HBIS Group Co. Ltd.Shijiazhuang 050000HebeiChina

Reduction pretreatment(RP)process,which is implemented after the billet is completely solidified,is an alternative process to further improve billet *** element method and experiment were used to investigate the effect of the RP process on the internal quality of 42CrMo *** ultrasonic testing technology was used to study the influence of the RP process on the *** a three-dimensional finite element model,the mechanism of the RP process on the porosity closure was *** experimental results show that the RP process eliminates the macro-porosities of the billet *** number of micro-porosities in the billets is effectively reduced,and the increase in deformation contributes to the reduction in *** with isothermal rolling,the RP process leads to a larger equivalent strain and hydrostatic integration in the billet center because of the temperature gradient,and the effect of the temperature gradient is greater with the increase in *** closure effect of micro-porosity is related not only to the stress state,but also to the distribution of *** increase in three-dimensional compressive stress is beneficial to the porosity *** the micro-porosities distributed densely,excessive stress could induce micro-porosity coalescence,which has the risk of inducing cracks.

关键词： Reduction pretreatment Temperature gradient Large deformation Micro-porosity Ultrasonic testing

A Light Weight Traffic Volume Prediction Approach Based on Finite Traffic Volume Data

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Journal of Systems Science and Systems Engineering 2023年第5期32卷 603-622页

作者： Xing Su Minghui Fan Zhi cai qing Liu Xiaojun Zhang Faculty of Information Technology Bering University of TechnologyBeijing100124China Shanghai Ocean University Shanghai201306China Academy of Opto-electronics Chinese Academy of SciencesBeijing100094China

As one of the key technologies of intelligent transportation systems, short-term traffic volume prediction plays an increasingly important role in solving urban traffic problems. In the last decade, many approaches were proposed for the traffic volume prediction from different perspectives. However, most of these approaches are based on a large amount of historical data. When there are only finite collected traffic data, they cannot be well trained, so the prediction accuracy of these approaches will be poor. In this paper, a tensor model is proposed to capture the change patterns of continuous traffic volumes. From collected traffic volume data, the element data are extracted to update the corresponding elements of the tensor model. Then, a tucker decomposition and gradient descent based algorithm is employed to impute the missing elements of the tensor model. After missing element imputation, the tensor model can be directly applied to the short-term traffic volume prediction through searching the corresponding elements of the model and the storage cost of the model is low. Our model is evaluated on real traffic volume data from PeMS dataset, which indicates that our model has higher traffic volume prediction accuracy than other approaches in the situation of finite traffic volume data.

关键词： Short-term traffic volume prediction tensor Tucker decomposition finite traffic volume data

IL-2Rα up-regulation is mediated by latent membrane protein 1 and promotes lymphomagenesis and chemotherapy resistance in natural killer/T-cell lymphoma

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Cancer Communications 2018年第1期38卷 667-676页

作者： Liang Wang Xi-wen Bi Yu-jia Zhu Ying-zhi He Qiu-yu Lai Zhong-jun Xia qing-qing cai Department of Hematology ZhuJiang HospitalSouthern Medical UniversityGuangzhou 510280GuangdongP.R.China State Key Laboratory of Oncology in South China Collaborative Innovation Center for Cancer MedicineGuangzhou 510060GuangdongP.R.China Department of Medical Oncology Sun Yat-sen University Cancer CenterGuangzhou 510060Guang-dongP.R.China Department of Radiation Oncology Sun Yat-sen University Cancer CenterGuangzhou 510060GuangdongP.R.China Department of Hematologic Oncology Sun Yat-sen University Cancer CenterGuangzhou 510060GuangdongP.R.China

Background:Natural killer/T-cell lymphoma(NKTCL)is a highly aggressive non-Hodgkin lymphoma often resistant to *** level of soluble IL-2 receptorα(IL-2Rα)is elevated in NKTCL patients and correlates signifi-cantly with treatment response and *** the current study we examined the potential role of IL-2Rαby over-expressing IL-2Rαin representative cell ***:Levels of IL-2Rαwere evaluated in the human natural killer cell line NK-92 and the NKTCL cell line *** vectors were used to express latent membrane protein 1(LMP1)in NK-92 cells,and IL-2Rαin both NK-92 and SNK-6 *** biological effects of these genes on proliferation,apoptosis,cell cycle distribution,and chemosensitiv-ity were ***:Expression of IL-2Rαwas significantly higher in SNK-6 cells than in NK-92 *** LMP1 in NK-92 cells remarkably up-regulated IL-2Rαlevels,whereas selective inhibitorss of the proteins in the MAPK/NF-κB pathway significantly down-regulated IL-2Rα.IL-2Rαoverexpression in SNK-6 cells promoted cell proliferation by altering cell cycle distribution,and induced resistance to gemcitabine,doxorubicin,and *** effects were reversed by an anti-IL-2Rα***:Our results suggest that LMP1 activates the MAPK/NF-κB pathway in NKTCL cells,up-regulating IL-2Rα***-2Rαoverexpression promotes growth and chemoresistance in NKTCL,making this interleukin receptor a potential therapeutic target.

关键词： Natural killer/T-cell lymphoma Latent membrane protein 1 Epstein-Barr virus Interleukin-2 receptor alpha

Quinolinyl Imidazolidin-2-imine Nickel Catalyzed Efficient Copolymerization of Norbornene with para-Chlorostyrene

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Chinese Journal of Polymer Science 2020年第9期38卷 941-949,I0005页

作者： Yan-qing Li Jian Zhou Ru Xiao Zheng-Guo cai State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China College of Biological and Chemical Engineering Guangxi University of Science and TechnologyLiuzhou 545006China

A series of novel quinolinyl imidazolidin-2-imine nickel complexes with different substituents on the imidazolidin-2-imine ligand were synthesized and *** complexes in the presence of methylaluminoxane(MAO)as a cocatalyst catalyzed the copolymerization of norbornene(N)and styrene(S)or para-chlorostyrene(CS)with high activity(up to 1070 kg·mol^-1·h^-1).The installation of sterically bulky substituents on the imidazolidine-2-imine ligand was effective for the increase of the molecular weight and the comonomer content,affording high molecular weight copolymers with tunable CS content(0.57 mol%-11.7 mol%),in which the existence of CI group can provide reaction site for the further functionalization of copolymers as well as the synthesis of graft or cross-linked *** linear relationship between the comonomer content and the glass transition temperature of the copolymers and the monomer reactivity ratios in the copolymerization indicated the formation of the expected functionalized cyclic olefin copolymers(COC).

关键词： Imidazolidin-2-imine ligand Nickel complex Norbornene para-Chlorostyrene Copolymerization