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liquid metal-based plant electronic tattoos for in-situ monitoring of plant physiology

Science China(Technological Sciences) 2023年第6期66卷 1617-1628页

作者： QU ChunChun CAO lingXiao li maolin WANG XiQing HE ZhiZhu College of Engineering China Agricultural UniversityBeijing 100083China Center for Crop Functional Genomics and Molecular Breeding China Agricultural UniversityBeijing 100083China Sanya Institute of China Agricultural University China Agricultural UniversitySanya 572000China

Flexible plant sensors,as a noninvasive and real-time monitoring method for plant physiology,are becoming crucial for precision ***,integrating flexible devices with plants are challenging due to their fragility and complex *** this study,we introduce a liquid metal-based plant electronic tattoo(LM-PET)that can harmlessly and continuously monitor the loss of water content and plant electrical signals,which are critical parameters for analyzing plant physiological *** LM-PET achieves double-sided conductivity through soluble electrostatic spinning films and transferring technology,effectively addressing the issue of mismatch between the rigid interface of electronic devices and the surface of delicate *** fabricated tattoo electrode can adhere tightly to the leaf surface for a long time and can significantly broaden the scope of moisture monitoring,even in cases of severe wrinkling caused by water *** the optimum operating frequency of 100 kHz,the sensitivity of LM-PET can reach 25.4 kΩ%^(-1).Thus,LM-PETs can record the electrical signals generated when abiotic stresses threaten *** are also significant in providing a deeper understanding of the drought adaptation mechanisms of plants and developing drought-resistant *** offer data-driven crop management and decision-making guidance,which is imperative for advancing precision ***,our findings provide valuable insights into the performance of agricultural inputs and facilitate real-time monitoring of plant growth and development.

关键词： plant flexible electrodes liquid metal impedance plant electrical signal plant phenotype

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Application of Instantaneous Rotational Speed to Detect Gearbox Faults Based on Double Encoders

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Chinese Journal of Mechanical Engineering 2019年第1期32卷 54-64页

作者： lin liang Fei liu Xiangwei Kong maolin li Guanghua Xu School of Mechanical Engineering Xi’an Jiaotong University Key Laboratory of Education Ministry for Modern Design and Rotor-bearing System Xi’an Jiaotong University Engineering Workshop Xi’an Jiaotong University State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong University

Considerable studies have been carried out on fault diagnosis of gears, with most of them concentrated on conventional vibration analysis. However, besides the complexity of gear dynamics, the diagnosis results in terms of vibration signal are easily misjudged owing to the interference of sensor position or other components. In this paper, an alternative gearbox fault detection method based on the instantaneous rotational speed is proposed because of its advantages over vibration analysis. Depending on the timer/counter-based method for the pulse signal of the optical encoder, the varying rotational speed can be obtained e ectively. Owing to the coupling and meshing of gears in transmission, the excitations are the same for the instantaneous rotational speed of the input and output shafts. Thus, the di erential signal of instantaneous rotational speeds can be adopted to eliminate the e ect of the interference excitations and extract the associated feature of the localized fault e ectively. With the experiments on multistage gearbox test system, the di erential signal of instantaneous speeds is compared with other signals. It is proved that localized faults in the gearbox generate small angular speed fluctuations, which are measurable with an optical encoder. Using the di erential signal of instantaneous speeds, the fault characteristics are extracted in the spectrum where the deterministic frequency component and its harmonics corresponding to crack fault characteristics are displayed clearly.

关键词： Instantaneous rotational speed Optical encoder Localized fault Multistage gearbox

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Preparation and Anti-wear and Friction-reducing Properties of Barium Borate Modified with Dodecoxyl Group

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China Petroleum Processing & Petrochemical Technology 2007年第4期9卷 55-59页

作者： Zeng Xiaojun li Fenfang Zhou maolin School of Chemistry and Chemical Engineering Central South University Changsha 410083

A novel lubricating oil additive dodecoxyl barium borate was synthesized. The product was characterized by FTIR, elemental analysis, thermo-gravimetric analysis （TGA）, and scanning electron microscopy （SEM）. Four-ball tests showed that the addition of a certain concentration of the additive to rapeseed oil could effectively increase both the load-carrying capacity （PB value）, resistance to wear, and friction-reducing abilities. SEM observations confirmed that the additive could result in a reduced diameter of the wear scar.

关键词： dodecoxyl barium borate prepare rapeseed oil tribological properties

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Effect of Intermolecular Interaction on Stability of Asphaltene-Hydrogen Donor System

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China Petroleum Processing & Petrochemical Technology 2022年第4期24卷 21-28页

作者： Sun Yudong li maolin liu Ziyuan Xiao Shengyu College of Chemical Engineering China University of PetroleumQingdao 266580China

The stability of three asphaltene-hydrogen donor systems,namely asphaltene-1-methylnaphthalene,asphaltene-tetralin,and asphaltene-decalin,with a mass ratio of 1:10 was investigated using the Turbiscan stability *** interactions between hydrogen donor molecules and asphaltene units were simulated and calculated using Gaussian and Multiwfn,and then,noncovalent interaction analysis was *** results showed that the stability of the three asphaltene-hydrogen donor systems decreased as follows:asphaltene-1-methylnaphthalene>asphaltene-tetralin>*** stability differences among the three systems were due to the different interactions between the hydrogen donor molecules and the asphaltene *** T-stacking interaction strength between the hydrogen donor molecules and the asphaltene units decreased as follows:1-methylnaphthalene-asphaltene unit>tetralin-asphaltene unit>decalin-asphaltene *** analysis indicates that the T-stacking interactions between the hydrogen donor molecules and the asphaltene units were mainly van der Waals forces,and the proportions of hydrogen bonds in the weak interaction differed among the systems.

关键词： asphaltene-hydrogen donor system stability interaction gaussian NCI analysis

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Synthesis of Two Novel Additives and Study of Their Tribological Properties in Rapeseed Oil

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China Petroleum Processing & Petrochemical Technology 2007年第3期9卷 29-33页

作者： Zhou maolin li Fenfang Zeng Xiaojun Fan Chengkai School of Chemistry and Chemical Engineering Central South University Changsha 410083 China

Two novel ashless additives - benzothiazole derivatives containing boron and chlorine, OBC and BBC, were synthesized. The tribological performances of OBC and BBC at different mass ratios as additives in rapeseed oil （RO） were examined on a four-ball machine. The worn surfaces of the lower steel balls lubricated by oil samples were analyzed by means of scanning electron microscopy （SEM）. The test results showed that OBC and BBC had good solubility in the base oil, and could effectively increase the load-carrying capacity of the base oil. The maximum non-seizure load of oil sample containing 1.5 m% BBC was 1117 N, which was 2.3 times as much as that of the base oil. Both OBC and BBC could improve the anti-wear and corrosion inhibiting performance and thermal stability of the base oil, whose initial decomposition temperatures was above 350 ~C. However, OBC and BBC at different concentrations could increase the friction coefficient of the base oil. The SEM morphology of steel balls lubricated by oil samples containing 1.5 m% additives seemed to be more uniform and smoother than that of the base oil, and the scars formed were very shallow.

关键词： additives anti-wear friction reduction rapeseed oil benzothiazole derivatives

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Removal of Fe3+ from Aqueous Solution by Natural Apatite

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Journal of Surface Engineered Materials and Advanced Technology 2014年第1期4卷 14-20页

作者： Gongming Qian maolin li Fei Wang Xinggang liu School of Resource and Environmental Engineering Wuhan University of Science & Technology Wuhan China

The feasibility of natural apatite for adsorptive removal of Fe3+ from aqueous solution was investigated. Batch experiments were performed as function of process parameters such as contact time, initial concentration of Fe3+, temperature, apatite dosage and pH. The natural apatite exhibited a high performance for the removal of Fe3+ from aqueous solution. The pH value clearly affects the removal mechanism of Fe3+ by natural apatite. At low pH value, dissolution/precipitation is the main effect. The effect of hydrolyzation increased with the pH value. After the pH value above 5.0, hydrolyzation is the main effect. The adsorption isotherms demonstrated that the adsorbent behaved in a favorable manner for Fe3+ adsorption. The experimental data were well fitted with Langmuir isotherm.

关键词： Adsorbent Iron Removal Apatite Adsorption Isotherm

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基于主题敏感的重启随机游走实体链接方法

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北京大学学报（自然科学版） 2016年第1期52卷 17-24页

作者：李茂林北京邮电大学智能科学与技术中心北京100876

实体链接任务的目的是将文本中的实体指称链接到知识库中与之对应的无歧义实体。针对此任务,提出一种基于主题敏感的重启随机游走的实体链接方法。该方法首先使用实体指称的背景文本信息将实体指称扩充为全称,并在维基百科知识库中搜索... 详细信息

实体链接任务的目的是将文本中的实体指称链接到知识库中与之对应的无歧义实体。针对此任务,提出一种基于主题敏感的重启随机游走的实体链接方法。该方法首先使用实体指称的背景文本信息将实体指称扩充为全称,并在维基百科知识库中搜索候选实体,得到候选实体集合;根据上述中间结果构建图,利用在图上的主题敏感重启随机游走得到的平稳分布对候选实体集合进行排序,选出top 1的候选实体作为目标实体。实验结果表明,该方法在KBP2014实体链接数据集上实验的F值为0.623,高于其他系统实验的F值,能够有效提高实体链接系统的整体性能。

关键词：实体链接随机游走维基百科

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中国式减税降费与经济高质量发展:企业金融化视角的研究

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财经研究 2021年第6期47卷 4-18页

作者：李真李茂林华东师范大学经济学院上海200062

大规模减税降费是后金融危机时代我国财政政策的重要特征,而且防止经济过度金融化及资本无序扩张是新时期构建内外双循环新发展格局的核心任务之一,但鲜有研究从虚拟经济和实体经济协调发展的角度研究此次减税降费对于中国经济高质量发... 详细信息

大规模减税降费是后金融危机时代我国财政政策的重要特征,而且防止经济过度金融化及资本无序扩张是新时期构建内外双循环新发展格局的核心任务之一,但鲜有研究从虚拟经济和实体经济协调发展的角度研究此次减税降费对于中国经济高质量发展的意义。文章基于地方性法规规章和行政区划禀赋特征,深入探讨供给侧改革中的减税降费政策对扭转我国经济金融化趋势的影响效应,理清财税政策在引导社会资本"脱虚还实"过程中的作用机制。研究发现:(1)减税降费政策对于企业金融化具有明显的抑制作用,且在非国有产权、非制造业行业、中西部地区、经济相对落后区域和规模较小的企业中表现得更为突出。(2)减税降费通过有效弱化企业的金融偏向性"投资替代"动机和"实体中介"动机促进社会资本回归实体领域,但并未对企业投资"蓄水池"动机产生显著影响。(3)减税降费对金融化的抑制作用虽有利于促进企业进行实物资本投资,但在引导金融资源回流而促进创新投资方面的作用效果并不明显。文章对于进一步科学优化财政政策设计以引导产业资本流动,以及构建有效的财税政策组合体系和协同有效的现代宏观治理机制具有积极意义。

关键词：减税降费企业金融化财政政策

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基于稀疏表示的故障敏感特征提取方法

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机械工程学报 2013年第1期49卷 73-80页

作者：栗茂林梁霖王孙安西安交通大学机械工程学院西安710049 西安交通大学工程坊西安710049

针对故障诊断中的特征选择问题,提出一种基于非负稀疏表示的低维敏感特征提取方法。为了增强主分量的可解释性,针对L1-范数优化目标,通过权系数的稀疏和非负约束实现非负稀疏主分量的提取。采用主分量特征的累积方差变化率自适应地确定... 详细信息

针对故障诊断中的特征选择问题,提出一种基于非负稀疏表示的低维敏感特征提取方法。为了增强主分量的可解释性,针对L1-范数优化目标,通过权系数的稀疏和非负约束实现非负稀疏主分量的提取。采用主分量特征的累积方差变化率自适应地确定稀疏度,并依据稀疏分量与原始特征少关联的需求确定稀疏分量的数目,实现敏感特征的优化提取。通过仿真数据的分析表明,非负稀疏分量不仅提取出描述原始数据分布的敏感特征,还提高了数据的聚类性能。将该方法应用于滚动轴承的多种故障状态识别中,在由非负稀疏主分量构成的特征空间中,数据的聚类效果优于主分量特征空间;综合分析稀疏参数的选取和敏感特征的提取过程,表明提出的稀疏表示方法不仅能自适应地确定稀疏度,还能有效地获取原始特征的敏感程度,为故障诊断特征提取提供了很好的解决方案。

关键词：稀疏表示主分量分析特征提取故障诊断

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利用非线性流形学习的轴承早期故障特征提取方法

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西安交通大学学报 2010年第5期44卷 45-49页

作者：栗茂林王孙安梁霖西安交通大学机械工程学院西安710049 西安交通大学机械制造系统工程国家重点实验室西安710049

针对早期故障微弱特征难以提取的问题,提出了一种基于非线性流形学习的滚动轴承早期故障特征提取方法.在由时域指标和小波频带能量组成的原始特征空间中,结合局部切空间排列学习算法的特点,采用散布矩阵分类测度指标,实现了局部邻域的... 详细信息

针对早期故障微弱特征难以提取的问题,提出了一种基于非线性流形学习的滚动轴承早期故障特征提取方法.在由时域指标和小波频带能量组成的原始特征空间中,结合局部切空间排列学习算法的特点,采用散布矩阵分类测度指标,实现了局部邻域的优化选取,从而提取出最优的敏感故障特征.通过实例应用,表明该方法有效地克服了主分量分析和非线性核主分量分析方法的不足,提取的融合特征敏感性更好,从而提高了故障模式的分类性能,实现了轴承的早期故障诊断.

关键词：特征提取流形学习故障诊断滚动轴承

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