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Tribological Mechanism of Graphene and Ionic Liquid Mixed Fluid on Grinding Interface under Nanofluid Minimum Quantity Lubrication

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Chinese Journal of Mechanical Engineering 2023年第4期36卷 79-96页

作者： Dexiang Wang Yu Zhang Qiliang Zhao Jingliang Jiang Guoliang Liu changhe Li School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdaoChina Key Lab of Industrial Fluid Energy Conservation and Pollution Control(Qingdao University of Technology) Ministry of EducationQingdaoChina

Graphene has superhigh thermal conductivity up to 5000 W/(m·K),extremely thin thickness,superhigh mechanical strength and nano-lamellar structure with low interlayer shear strength,making it possess great potential in mini-mum quantity lubrication(MQL)***,ionic liquids(ILs)have higher thermal conductivity and better thermal stability than vegetable oils,which are frequently used as MQL grinding *** ILs have extremely low vapor pressure,thereby avoiding film boiling in *** excellent properties make ILs also have immense potential in MQL ***,the grinding performance of graphene and ionic liquid mixed fluid under nano-fluid minimum quantity lubrication(NMQL),and its tribological mechanism on abrasive grain/workpiece grinding interface,are still *** research firstly evaluates the grinding performance of graphene and ionic liquid mixed nanofluids(graphene/IL nanofluids)under NMQL *** evaluation shows that graphene/IL nanofluids can further strengthen both the cooling and lubricating performances compared with MQL grinding using ILs *** specific grinding energy and grinding force ratio can be reduced by over 40%at grinding depth of 10μ***-piece machined surface roughness can be decreased by over 10%,and grinding temperature can be lowered over 50℃at grinding depth of 30μ*** at the unclear tribological mechanism of graphene/IL nanofluids,molecular dynamics simulations for abrasive grain/workpiece grinding interface are performed to explore the formation mechanism of physical adsorption *** simulations show that the grinding interface is in a boundary lubrication *** molecules absorb in groove-like fractures on grain wear flat face to form boundary lubrication film,and graphene nanosheets can enter into the grinding interface to further decrease the contact area between abrasive grain and *** with MQL grinding,the average tangential grinding force of graphene/IL nanof

关键词： Grinding Nanofluid minimum quantity lubrication Graphene Tribological mechanism

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电感耦合等离子体质谱法测定人促红素注射剂中13种杂质元素

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化学分析计量 2024年第3期33卷 12-16页

作者：唐娜陈统华苏超男王嫦鹤陕西省食品药品检验研究院西安710065

建立了电感耦合等离子体质谱法测定人促红素注射剂中Cd、Hg、Pb、As、Co、V、Ni、Sb、Mo、Cu、Cr、Al、Fe共13种杂质元素含量。以Sc、In、Ge为内标,采用ICP-MS法测定,等离子体射频功率为1549 W,载气流量为1.12 L/min。Al、Fe质量浓度在0... 详细信息

建立了电感耦合等离子体质谱法测定人促红素注射剂中Cd、Hg、Pb、As、Co、V、Ni、Sb、Mo、Cu、Cr、Al、Fe共13种杂质元素含量。以Sc、In、Ge为内标,采用ICP-MS法测定,等离子体射频功率为1549 W,载气流量为1.12 L/min。Al、Fe质量浓度在0~50 ng/mL范围内、其余11种元素质量浓度在0~10 ng/mL范围内线性关系良好,相关系数均不小于0.999,样品加标平均回收率为81.5%~118.0%,测定结果的相对标准偏差为1.10%~2.82%(n=6),各元素检出限为0.0015~1.1488 ng/g。不同厂家的人促红素注射剂中13种杂质元素的含量均符合ICH规定。该方法准确性好,灵敏度高,可同时测定多种元素,适用于人促红素注射剂中杂质元素的质量控制。

关键词：人促红素电感耦合等离子体质谱杂质元素

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大豆玉米带状复合种植技术研究进展

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新疆农机化 2024年第1期 27-30,41页

作者：杨豫新牛长河班婷新疆农业科学院农业机械化研究所新疆乌鲁木齐830091

大豆玉米带状复合种植技术是保障我国玉米和大豆产量的一项关键性技术,本文从品种选育、种植模式研究和配套机械设备的研发等方面进行了介绍,提出了大豆玉米带状复合种植生产中存在的问题,并对相应的技术问题进行展望,为后续大豆玉米带... 详细信息

大豆玉米带状复合种植技术是保障我国玉米和大豆产量的一项关键性技术,本文从品种选育、种植模式研究和配套机械设备的研发等方面进行了介绍,提出了大豆玉米带状复合种植生产中存在的问题,并对相应的技术问题进行展望,为后续大豆玉米带状复合种植提供参考。

关键词：大豆玉米带状复合种植技术研究进展

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抚育间伐对人工柳杉林分生长的影响

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林业科技情报 2024年第04期56卷 137-139页

作者：吴丽丽邓长贺雷雨毕节市七星关区林业局国家林业和草原局重点国有林区森林资源监测中心

为探究了不同间伐强度对人工柳杉林分生长的影响，对人工柳杉林分实施抚育间伐(用伐后郁闭度体现间伐强度),伐后郁闭度为0.50、0.60、0.70、0.85(对照，未间伐),3a后研究不同伐后郁闭度对人工柳杉林分生长的变化。结果表明：抚育间伐可... 详细信息

为探究了不同间伐强度对人工柳杉林分生长的影响，对人工柳杉林分实施抚育间伐(用伐后郁闭度体现间伐强度),伐后郁闭度为0.50、0.60、0.70、0.85(对照，未间伐),3a后研究不同伐后郁闭度对人工柳杉林分生长的变化。结果表明：抚育间伐可以有效促进林分生长，具体表现在林分平均胸径、林分平均高、林分断面积、林分平均单株材积和林分蓄积5个方面，且研究发现，在抚育间伐措施中，当伐后郁闭度为0.5～0.6时林分生长效果最佳，其中0.5的伐后郁闭度的蓄积生长量最高，显著高于其余各处理。

关键词：抚育间伐柳杉林分生长

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Study on drying and combustion process in grate-CFB incinerator

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Science China(Technological Sciences) 2009年第5期52卷 1153-1160页

作者： QingHai Li YanGuo Zhang MeiQian Chen AiHong Meng changhe Chen Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing 100084 China School of Mechanical Electronical and Control Engineering Beijing Jiaotong University Beijing 100044 China

The drying and combustion process in the combined grate and circulating fluidized bed (grate-CFB) municipal solid waste (MSW) incinerator was investigated experimentally and mathematically. The drying grate bed was simulated by a muffle furnace, which could be controlled at a constant temperature level. The kind of wastes, thickness of waste layer fed and temperature were chosen as the adjustable parameters to study their effect on the drying process. The experimental results indicated that the hydrophilic wastes were more difficult to be dried than the hydrophobic wastes. The higher the temperature is the easier the waste is to be dried. The thinner waste layer is favorable to drying the waste. The pyrolysis experiment in the furnace showed that the higher temperature level could reduce the conversion rate of carbon to carbon monoxide. The semi-empirical mathematical model that included the bed material distribution submodel, volatile matter release submodel, carbon particle combustion submodel and so on was proposed. A 260 t/d grate-CFB incinerator was modeled and the model predicted bulk density agreed with the measured value from industrial field test. The predicted flue gas (e.g. CO2, CO) concentration deviated slightly from the industrial test data. The parameters and variables used in the model were determined by the experiments or practical field test. This model can be used to design the grate-CFB incinerator and guide its operation.

关键词： drying waste incineration grate-CFB combustion model

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An efficient algorithm for approximate Voronoi diagram construction on triangulated surfaces

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Computational Visual Media 2023年第3期9卷 443-459页

作者： Wenlong Meng Pengbo Bo Xiaodong Zhang Jixiang Hong Shiqing Xin changhe Tu School of Computer Science and Technology Harbin Institute of TechnologyWeihai 264209China School of Computer Science and Technology Shandong UniversityQingdao 266237China

Voronoi diagrams on triangulated surfaces based on the geodesic metric play a key role in many applications of computer *** methods of constructing such Voronoi diagrams generally depended on having an exact geodesic ***,exact geodesic computation is time-consuming and has high memory usage,limiting wider application of geodesic Voronoi diagrams(GVDs).In order to overcome this issue,instead of using exact methods,we reformulate a graph method based on Steiner point insertion,as an effective way to obtain geodesic ***,since a bisector comprises hyperbolic and line segments,we utilize Apollonius diagrams to encode complicated structures,enabling Voronoi diagrams to encode a medial-axis surface for a dense set of boundary *** on these strategies,we present an approximation algorithm for efficient Voronoi diagram construction on triangulated *** also suggest a measure for evaluating similarity of our results to the exact *** our GVD results are constructed using approximate geodesic distances,we can get GVD results similar to exact results by inserting Steiner points on triangle *** results on many 3D models indicate the improved speed and memory requirements compared to previous leading methods.

关键词： geodesic Voronoi diagrams(GVDs) triangular surfaces mesh surfaces approximate geodesics Apollonius diagrams

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微创经皮钢板接骨术联合锁定加压钢板内固定术治疗胫骨远端骨折患者的效果

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中国民康医学 2024年第19期36卷 48-50,54页

作者：和亚南段长合董德涛新乡县人民医院骨科河南新乡453700

目的:观察微创经皮钢板接骨术联合锁定加压钢板内固定术治疗胫骨远端骨折患者的效果。方法:选取2020年1月至2023年6月该院收治的60例胫骨远端骨折患者进行前瞻性研究,按照随机数字表法将其分为研究组和对照组各30例。研究组采用微创经... 详细信息

目的:观察微创经皮钢板接骨术联合锁定加压钢板内固定术治疗胫骨远端骨折患者的效果。方法:选取2020年1月至2023年6月该院收治的60例胫骨远端骨折患者进行前瞻性研究,按照随机数字表法将其分为研究组和对照组各30例。研究组采用微创经皮钢板接骨术联合锁定加压钢板内固定术治疗,对照组采用切开复位钢板内固定术治疗。比较两组手术优良率,围术期指标(住院时间、骨折愈合时间、术中出血量)水平,手术前后踝关节功能[美国足踝外科协会踝-后足评分量表(AOFAS-AH)]评分、疼痛[视觉模拟评分法(VAS)]评分、应激指标[肾上腺素(E)、β-内啡肽(β-EP)、皮质醇(Cor)]水平,以及并发症发生率。结果:研究组手术优良率为93.33%(28/30),高于对照组的73.33%(22/30),差异有统计学意义(P0.05)。结论:微创经皮钢板接骨术联合锁定加压钢板内固定术治疗胫骨远端骨折患者可提高手术优良率和踝关节功能评分,改善围术期指标水平,降低疼痛评分和应激指标水平,效果优于切开复位钢板内固定术治疗。

关键词：微创经皮钢板接骨术锁定加压钢板内固定术胫骨远端骨折疼痛踝关节功能应激

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Grinding temperature and energy ratio coefficient in MQL grinding of high-temperature nickel-base alloy by using different vegetable oils as base oil

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Chinese Journal of Aeronautics 2016年第4期29卷 1084-1095页

作者： Li Benkai Li changhe Zhang Yanbin Wang Yaogang Jia Dongzhou Yang Min School of Mechanical Engineering Qingdao Technological University

Vegetable oil can be used as a base oil in minimal quantity of lubrication (MQL). This study compared the performances of MQL grinding by using castor oil, soybean oil, rapeseed oil, corn oil, sunflower oil, peanut oil, and palm oil as base oils. A K-P36 numerical-control precision surface grinder was used to perform plain grinding on a workpiece material with a high-temperature nickel base alloy. A YDM-III 99 three-dimensional dynamometer was used to measure grinding force, and a clip-type thermocouple was used to determine grinding temperature. The grinding force, grinding temperature, and energy ratio coefficient of MQL grinding were compared among the seven vegetable oil types. Results revealed that (1) castor oil-based MQL grinding yields the lowest grinding force but exhibits the highest grinding temperature and energy ratio coefficient; (2) palm oil-based MQL grinding generates the second lowest grinding force but shows the lowest grinding temperature and energy ratio coefficient; (3) MQL grinding based on the five other vegetable oils produces similar grinding forces, grinding temperatures, and energy ratio coefficients, with values ranging between those of castor oil and palm oil; (4) viscosity significantly influences grinding force and grinding temperature to a greater extent than fatty acid varieties and contents in vegetable oils; (5) although more viscous vegetable oil exhibits greater lubrication and significantly lower grinding force than less viscous vegetable oil, high viscosity reduces the heat exchange capability of vegetable oil and thus yields a high grinding temperature; (6) saturated fatty acid is a more efficient lubricant than unsaturated fatty acid; and (7) a short carbon chain transfers heat more effectively than a long carbon chain. Palm oil is the optimum base oil of MQL grinding, and this base oil yields 26.98 N tangential grinding force, 87.10 N normal grinding force, 119.6 degrees C grinding temperature, and 42.7% energy ratio coeffi

关键词： Base oil Carbon chain length Energy ratio coefficient Grinding force Grinding temperature MQL grinding Vegetable oil Viscosity

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大径材培育对杉木林下植被生态位和种间联结特性的影响

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林业科技通讯 2024年第6期 1-6页

作者：曹飞燕周昌和蔡超俞飞伊力塔浙江农林大学林业与生物技术学院杭州311300 浙江省龙泉市林业局浙江龙泉323700

林下植被对提升人工林生产力和生态系统稳定性至关重要。本研究对间伐后5年杉木(Cunninghamia lanceolata)林和未间伐杉木林(对照)的林下植被群落特征进行了研究,分析以大径材培育为目标的经营措施对林下植被生态位、种间联结和群落稳... 详细信息

林下植被对提升人工林生产力和生态系统稳定性至关重要。本研究对间伐后5年杉木(Cunninghamia lanceolata)林和未间伐杉木林(对照)的林下植被群落特征进行了研究,分析以大径材培育为目标的经营措施对林下植被生态位、种间联结和群落稳定性的影响。结果表明:1)间伐导致灌木层优势种由喜阴植物转变成了喜光或中性植物,显著增加了灌木和草本层的物种数;2)间伐林下植被生态位宽度较对照的窄,生态位重叠显著低于对照;3)与对照相比,间伐灌木层物种间正关联程度增强,群落稳定性有所提高。但是草本层物种以负联结为主,群落结构不稳定。因此,大径材培育过程中,间伐通过提供更多的生态位增加了杉木林下植被物种丰富度,改变物种组成,并提高了物种间的依赖程度。

关键词：生态学间伐杉木 Cunninghamia lanceolata 林窗生境异质性林下植被

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Bidirectional regulation of Ca^(2+) in exo–endocytosis coupling

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Science China(Life Sciences) 2018年第12期61卷 1583-1585页

作者： Qian Song Mingzhu Huang Bianbian Wang Xinjiang Kang changhe Wang Center for Mitochondrial Biology and Medicine The Key Laboratory of Biomedical Information Engineering of Ministry of Education School of Life Science and Technology and Frontier Institute of Science and Technology Xi'an Jiaotong University College of Life Sciences Liaocheng University DOE-Key Lab of Medical Electrophysiology Institute of Cardiovascular Research Southwest Medical University

Vesicular exocytosis is a key process involved in neurotransmitter release,whereas vesicle recycling is critical for the homeostasis of plasma membrane structures and the maintenance of ***^2+ regulates several fundamental cellular processes(Zhu et al.,2016,Xiong and Zhu,2016).Especially,Ca^2+ influx plays a dual role of triggering vesicular exocytosis and modulating compensatory endocytosis in neurons and endocrine cells.

关键词： Vesicular exocytosis key process

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