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A Cross-Coupled Iterative Learning Control Design for Biaxial Systems Based on Natural Local Approximation of Contour Error 36

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A Cross-Coupled Iterative Learning Control Design for Biaxia...

An Implementation of Full Cycle Strategy Using Dynamic Blending for Rapid Refresh Short-range Weather Forecasting in China

第36届中国控制会议

作者： Shihua liu yanjie li Harbin Institute of Technology Shenzhen Graduate School

ISBN: (纸本)9781538629185

The contour error is the core index to measure the machining quality,so how to get an accurate contour error value and reduce contour error is still an urgent problem in the production process,especially in high-speed and large-curvature contouring *** this paper,a cross-coupled iterative learning control（CCILC） based on natural local approximation of contour error is proposed to reduce the contour error in the repetitive machining *** and experiments on XY-table demonstrate that the contour error can be reduced effectively by using the proposed method.

关键词： Cross-Coupled Control Iterative Learning Control Natural Local Approximation

来源： cnki会议评论

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Advances in Atmospheric Sciences 2021年第6期38卷 943-956页

作者： Jin FENG Min CHEN yanjie li Jiqin ZHONG Institute of Urban Meteorology(IUM) China Meteorological Administration(CMA)Beijing 100089China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

The partial cycle(PC)strategy has been used in many rapid refresh cycle systems(RRC)for regional short-range weather *** the strategy periodically reinitializes the regional model(RM)from the global model(GM)forecasts to correct the large-scale drift,it has replaced the traditional full cycle(FC)strategy in many RRC ***,the extra spin-up in the PC strategy increases the computer burden on RRC and generates discontinuous smallscale systems among *** study returns to the FC strategy but with initial fields generated by dynamic blending(DB)and data assimilation(DA).The DB ingests the time-varied large-scale information from the GM to the RM to generate less-biased background *** the DA is *** applied the new FC strategy in a series of 7-day batch forecasts with the 3-hour cycle in July 2018,and February,April,and October 2019 over China using a Weather Research and Forecast(WRF)model-based RRC.A comparison shows that the new FC strategy results in less model bias than the PC strategy in most state variables and improves the forecast skills for moderate and light *** new FC strategy also allows the model to reach a balanced state earlier and gives favorable forecast continuity between adjacent ***,this new FC strategy has potential to be applied in RRC forecast systems to replace the currently used PC strategy.

关键词： rapid refresh weather forecast full cycle blending

Computational uncertainty and optimal grid size and time step of the Lax-Friedrichs scheme for the 1D advection equation

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Atmospheric and Oceanic Science Letters 2023年第3期16卷 46-51页

作者： Jing Cao Jianping li yanjie li College of Science Tianjin University of TechnologyTianjinChina Frontiers Science Center for Deep Ocean Multispheres and Earth System/Key Laboratory of Physical Oceanography/Academy of the Future Ocean/Innovation Center for Ocean Carbon Neutrality Ocean University of ChinaQingdaoChina Laboratory for Ocean Dynamics and Climate Pilot Qingdao National Laboratory for Marine Science and TechnologyQingdaoChina State Key Laboratoryof Numerical Modelingfor Atmospheric Sciences and GeophysicalFluid Dynamics Instituteof Atmospheric PhysicsChinese Academyof SciencesBejingChina

本文对于应用Lax-Friedrichs格式数值求解一维平流方程,研究数值求解过程中产生的截断误差与舍入误差,以及两种误差逐层向高时间层传播的累积,得到新的数值解总误差上界的理论近似公式,以及最优格距和最优时间步长的理论公式.通过数值... 详细信息

本文对于应用Lax-Friedrichs格式数值求解一维平流方程,研究数值求解过程中产生的截断误差与舍入误差,以及两种误差逐层向高时间层传播的累积,得到新的数值解总误差上界的理论近似公式,以及最优格距和最优时间步长的理论公式.通过数值算例验证了所得公式的可靠性。然后,发现了两种不同机器精度下最优时间步长之比满足的一个仅与机器精度有关的普适关系.最后,理论验证了在网格比固定的情况下,此问题满足数值计算的不确定性原理,以及在机器有限精度下最优时间步长的必然存在。

关键词： Lax-Friedrichs格式数值计算的不确定性原理最优格距最优时间步长普适关系

ExtSpecR:An R Package and Tool for Extracting Tree Spectra from UAV-Based Remote Sensing

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Plant Phenomics 2023年第4期5卷 893-904页

作者： Zhuo liu Mahmoud AI-Sarayreh Cong Xu Federico Tomasetto yanjie li State Key Laboratory of Tree Genetics and Breeding Research Institute of Subtropical ForestryChinese Academy of ForestryHangzhouZhejiang 311400China Key Laboratory of Tree Breeding of Zhejiang Province Research Institute of Subtropical ForestryChinese Academy of ForestryHangzhouZhejiang 311400China Department of Computer Engineering German Jordanian UniversityAmman 11180Jordan School of Forestry University of CanterburyPrivate Bag 4800Christchurch 8140New Zealand AgResearch Ltd. Christchurch 8140New Zealand

The development of unmanned aerial vehicle(UAV)remote sensing has been increasingly applied in forestry for high-throughput and rapid acquisition of tree phenomics traits for various research ***,the detection of individual trees and the extraction of their spectral data remain a challenge,often requiring manual *** several software-based solutions have been developed,they are far from being widely *** paper presents ExtSpecR,an open-source tool for spectral extraction of a single tree in forestry with an easy-to-use interactive web *** reduces the time required for single tree detection and annotation and simplifies the entire process of spectral and spatial feature extraction from UAV-based *** addition,ExtSpecR provides several functionalities with interactive dashboards that allow users to maximize the quality of information extracted from UAV *** can promote the practical use of UAV remote sensing data among forest ecology and tree breeding researchers and help them to further understand the relationships between tree growth and its physiological traits.

关键词： interactive Remote Tool

Distribution of per-and polyfluoroalkyl substances in blood,serum,and urine of patients with liver cancer and associations with liver function biomarkers

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Journal of Environmental Sciences 2024年第5期139卷 418-427页

作者： Cao Dai lin Peng yanjie li Zhendong li Da Chen Fei Wang Nan lin Department of Hepatobiliary Surgery The Third Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510630China School of Environment Guangdong Key Laboratory of Environmental Pollution and HealthJinan UniversityGuangzhou 510632China State Key Laboratory of Environmental and Biological Analysis Department of ChemistryHong Kong Baptist UniversityHong Kong 999077China South China Institute of Environmental Sciences MEEGuangzhou 510655China

Studies have shown that per-and polyfluoroalkyl substances(PFASs)may be hepatotoxic in animals or ***,data on clinical epidemiology are very *** this study,21PFASs were determined in patients with liver diseases,with the highest median concentrations detected in the serum sample(26.7 ng/mL),followed by blood(10.7 ng/mL)and urine(5.02 ng/mL).Higher total PFAS concentrations were found in hepatocellular carcinoma(HCC)patients compared to non-HCC patients,with significant discrepancies in serum and blood ***,significant correlations were also found among PFAS concentrations and age,gender,body mass index(BMI),and liver function biomarkers *** example,PFAS concentrations are significantly higher in males than in females;Several serum PFASs concentrations increase with age and BMI,while the serum perfluorohexane sulfonic acid(PFHxS)concentrations are negatively correlated with *** addition,multiple regression models adjusted for age,gender and BMI found that increased serum perfluorobutane sulfonic acid(PFBS),perfluoroheptane sulfonic acid(PFHpS)and perfluorohexylphosphonic acid(PFHxPA)conentrations are correlated with elevated alkaline phosphatase(ALP),aspartate aminotransferase(AST),and alpha-fetoprotein(AFP)(plinical hepatotoxicity of PFAS.

关键词： Per-and polyfluoroalkyl substances(PFASs) liver cancer Serum Blood Urine liver function biomarkers

Spectrometric Prediction of Nitrogen Content in Different Tissues of Slash Pine Trees

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Plant Phenomics 2022年第1期4卷 420-429页

作者： yanjie li Honggang Sun Federico Tomasetto Jingmin Jiang Qifu Luan Research Institute of Subtropical Forestry Chinese Academy of ForestryHangzhouZhejiang 311400China AgResearch Ltd. Christchurch 8140New Zealand

The internal cycling of nitrogen(N)storage and consumption in trees is an important physiological mechanism associated with tree ***,we examined the capability of near-infrared spectroscopy(NIR)to quantify the N concentration across tissue types(needle,trunk,branch,and root)without time and *** NIR spectral data of different tissues from slash pine trees were collected,and the N concentration in each tissue was determined using standard analytical method in laboratory.

关键词： pine cycling consuming

Analysis of Seed Phenotypic and Metabolic Characteristics of Diploid and Tetraploid Tartary Buckwheat

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Phyton-International Journal of Experimental Botany 2022年第9期91卷 1973-1986页

作者： Xiaodong Shi Cong Wang Wenjian li Hanlei Xiao yanjie li Bei Niu Key Laboratory of Coarse Cereal Processing Ministry of Agriculture and Rural AffairsSchool of Food and Biological EngineeringChengdu UniversityChengdu610106China School of Preclinical Medicine Chengdu UniversityChengdu610106China

Polyploid plants grow well,are stress tolerant,and are rich in nutrients and bioactive ***,they are useful for improving crop quality and *** this study,we compared the seed characteristics and metabolite profiles of diploid and tetraploid tartary buckwheat,which was developed via an artificially induced chromosome doubling *** length,width,area,and thousand-grain weight were greater for the tetraploid seeds than for the diploid ***,the germination rate decreased for the tetraploid ***,there was a gap between the shell and kernel of the tetraploid ***,the water absorption rate was higher for the tetraploid than for the diploid *** doubling increased the seed total flavonoid content and deepened the seed color.A principal component analysis of the ultrahigh-pressure liquid chromatography-high resolution mass spectrometry data revealed the clear separation between the diploid and tetraploid *** orthogonal partial least squares-discriminant analysis and other multivariate statistical analyses identified 83 differentially abundant compounds,with most of the flavonoid metabolites more abundant in the tetraploid than in the diploid *** on tartary buckwheat polyploidy may result in enhanced germplasm resources and may clarify the mechanism underlying the biosynthesis of bioactive compounds.

关键词： Tartary buckwheat diploid tetraploid seed

中药单体治疗脊髓损伤后神经炎症:核转录因子κB信号通路的作用

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中国组织工程研究 2025年第3期29卷 590-598页

作者：徐振华李彦杰秦合伟刘昊源朱博超王煜普河南中医药大学康复医学院河南省郑州市450046 河南省中医院康复科河南省郑州市450002

背景:基于核转录因子κB通路探究神经炎症的靶向治疗越来越值得探究,中药靶点多、范围广、机制丰富及不良反应少等优点在治疗各类疾病时都具有十分巨大的潜力。目的:基于核转录因子κB信号通路,对近年研究中出现的山奈酚、红花黄、汉黄... 详细信息

背景:基于核转录因子κB通路探究神经炎症的靶向治疗越来越值得探究,中药靶点多、范围广、机制丰富及不良反应少等优点在治疗各类疾病时都具有十分巨大的潜力。目的:基于核转录因子κB信号通路,对近年研究中出现的山奈酚、红花黄、汉黄芩苷及雷公藤甲素等中药单体治疗脊髓损伤后神经炎症的研究进展进行系统的阐述与归纳。方法:以“脊髓损伤,炎症,抗炎,中药单体,单体化合物,NF-κB信号通路,黄酮,糖苷,酚类,酯类,生物碱”为检索词在中国知网数据库中进行检索;以“Spinal cord injury,inflammation,anti-inflammatory,traditional Chinese medicine monomer,monomeric compound,NF-κB signaling pathway,flavonoids,glycosides,phenols,esters,alkaloids”为检索词在PubMed数据库中进行检索,最终共纳入67篇文献进行综述分析。结果与结论:①核转录因子κB信号通路在神经系统中的作用复杂多样,能够调控中性粒细胞、小胶质细胞、星形胶质细胞和巨噬细胞等,介导损伤后炎症的发生与发展;②中药单体如汉黄芩苷对核转录因子κB抑制蛋白的降解、红花黄素对核转录因子κB信号通路磷酸化过程的抑制、山奈酚对核转录因子κB信号通路p65核易位的抑制等作用可以降低炎症反应对机体造成的影响,从而促进神经功能恢复;③核转录因子κB信号通路在损伤早期能够促进炎症反应和免疫细胞迁移活化,在损伤中后期能够促进损伤部位的修复和纤维化的发生等,适当的激活核转录因子κB信号通路具有促进炎症因子的释放、提高细胞的抗氧化能力及促进免疫细胞的活化等能力,但过度激活的核转录因子κB信号通路则容易导致慢性炎症的发生和持续、细胞凋亡受到抑制等;④未来的研究可以进一步探索如何准确调控核转录因子κB信号通路的活化水平、如何实现对神经系统炎症和损伤的精准干预展开,也可围绕中药单体的制备及中药单体对信号通路的作用机制展开,以期为神经系统疾病的康复和功能恢复提供更有效的治疗策略。

关键词：核转录因子κB 信号通路脊髓损伤中药单体继发性损伤神经炎症小胶质细胞星形胶质细胞糖苷机制

A micro-scale strain rosette for residual stress measurement by SEM Moiré method

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Science China(Physics,Mechanics & Astronomy) 2014年第4期57卷 716-722页

作者： ZHU RongHua XIE HuiMin ZHU JianGuo li yanjie CHE ZhiGang ZOU ShiKun Key Laboratory of Applied Mechanics (AML) Department of Engineering Mechanics Tsinghua University School of Civil Engineering and Architecture University of Jinan Beijing Aeronautical Manufacturing Technology Research Institute

In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is *** FIB is employed to introduce stress relief like the macro ring-core method and fabricate gratings with a frequency of 5000 lines/mm on the measured area of the sample *** groups of gratings in different radial directions are manufactured in order to form a micro-scale strain *** milling ring-core by FIB,the deformation incurred by relief of the stress will be recorded with the strain *** displacement/strain field can be measured using SEM scanning Moiréwith random phase-shifting *** this study,the Nickel alloy GH4169 sample(which was processed by laser shock peening)is selected as a study object to determine its residual *** results showed that the components of the in-plane principal stresses were-359 MPa and-207 MPa,respectively,which show good agreement with the results obtained from the available literature.

关键词： residual stress focused ion beam SEM Moiré method ring-core method random phase-shifting