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Application of a screw conveyor with axial tilt blades on a shearer drum and investigation of conveying performance based on DEM

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Particuology 2022年第2期20卷 91-102页

作者： liqing sun Xiaodi Zhang Qingliang Zeng Kuidong Gao Kao Jiang Jiawei Zhou College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590China Shandong Province Key Laboratory of Mine Mechanical Engineering Shandong University of Science and TechnologyQingdao 266590China School of Information Science and Engineering Shandong Normal UniversityJinan 250014China School of Mechanical Engineering North China University of Water Resources and Electric PowerZhengzhou 450045China

Screw conveyors are widely employed in industrial fields for conveying bulk *** shearer drum which uses the screw conveying principle is responsible for excavation and conveying coal particles onto the chain *** conveyor performance is affected by potential factors,such as the blade axial tilt angle and style,core shaft form and *** effect of blade axial tilt angle on the conveying performance was investigated with the help of *** the case of the screw conveyor,the mass flow rate,and particle axial velocity increased with increasing positive axial tilt angle,and declined with increasing negative axial tilt *** the case of the drum,the mass flow rate,particle axial velocity,and loading rate first increased and then decreased with increasing positive axial tilt angle,and decreased with increasing negative axial tilt *** results can be considered as a benchmark for screw conveyor and drum structural designs with axial tilt screw blades.

关键词： Screw conveyor Drum Axial tilt angle Conveying performance DEM

超高效液相色谱-串联质谱法检测乳清蛋白粉中神经节苷脂GD3

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中国乳品工业 2024年第1期52卷 53-58页

作者：宋戈苗晶孙立庆高珊徐慧许瑞敏李筱薇黑龙江省绿色食品科学研究院哈尔滨150028 美赞臣婴幼儿营养品研发中心有限公司广州510000

建立了超高效液相色谱-串联质谱快速测定乳清蛋白中双唾液酸神经节苷脂(GD3)的方法。通过试验优化样品的初次提取条件(提取剂比例及用量)和再萃取条件(萃取剂用量)。在样品充分溶解后,用4 mL三氯甲烷-甲醇溶液(V_(三氯甲烷)∶V_(甲醇溶... 详细信息

建立了超高效液相色谱-串联质谱快速测定乳清蛋白中双唾液酸神经节苷脂(GD3)的方法。通过试验优化样品的初次提取条件(提取剂比例及用量)和再萃取条件(萃取剂用量)。在样品充分溶解后,用4 mL三氯甲烷-甲醇溶液(V_(三氯甲烷)∶V_(甲醇溶液)=1∶2)提取1.0 mL样液,转移合并提取液,加入2.0 mL水进行萃取转移为最佳提取条件。然后分别对质谱与色谱条件(定量扫描模式、色谱柱以及流动相pH)进行优化,选取Syncronis HILIC硅胶色谱柱,以0.01 mol/L乙酸铵水溶液-乙腈(pH5.6)为流动相,进行色谱分离,色谱分离后采用母离子监测模式定量测定和多反应监测模式定性分析。在最佳优化分析条件下,双唾液酸神经节苷脂GD3质量浓度在0.5~50.0μg/mL内具有良好的线性关系,相关系数(R^(2))>0.99,回收率在87.3%~103.7%,精密度(RSD)为4.16%~8.95%,检出限在0.1 g/kg。该方法可用于乳清蛋白粉中双唾液酸神经节苷脂GD3。

关键词：双唾液酸神经节苷脂GD3 母离子扫描乳清蛋白超高效液相色谱-串联质谱

Prognosis and outcome of intrauterine treatment of fetuses with critical congenital heart disease

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Chinese Medical Journal 2024年第12期137卷 1431-1436页

作者： liqing Zhao Lei Wang Hongping Xia Yurong Wu Xianting Jiao Hong Zhu sun Chen Kun sun Department of Pediatric Cardiology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Diagnosis and Treatment Center for in utero Pediatric Disease Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China Department of Neonatology Xinhua Hospital Affiliated to Shanghai Jiao Tong University School of MedicineShanghai 200092China

Background:Intrauterine valvuloplasty is an innovative therapy,which promotes ventricular growth and function in some congenital heart diseases(CHDs).The technique remains challenging and can only be performed in a few *** study aimed to assess the feasibility and mid-term outcomes of fetal cardiac intervention(FCI)in fetuses with critical CHD in an experienced tertiary ***:Five fetal aortic valvuloplasty(FAV)or fetal pulmonary valvuloplasty(FPV)procedures were performed in our fetal heart center between August 2018 and May *** success was defined as crossing the aortic or pulmonary valve and balloon inflation,followed by evidence of increased blood flow across the valve and/or new ***-up clinical records and echocardiography were obtained during the prenatal and postnatal ***:Five fetuses received FAV or FPV,including critical aortic stenosis(n=2)and pulmonary atresia with intact ventricular septum(n=3).The mean maternal age was 33.0±2.6 *** median gestational age(GA)at diagnosis was 24 weeks(range,22-26 weeks).The median GA at intervention was 29 weeks(range,28-32 weeks).All five cases underwent successful or partially successful *** patient had pulmonary valve perforation without balloon *** procedure-related deaths or significant complications ***,one neonatal death occurred due to heart and renal *** median follow-up period was 29.5 months(range,8.0-48.0 months).The four surviving patients had achieved biventricular circulation,exhibited improved valve,and ventricular development at the last follow-up ***:Intrauterine FCI could be performed safely with good prognosis in critical CHD.

关键词： Fetal cardiac intervention Valvuloplasty Pulmonary atresia Critical aortic stenosis Congenital heart disease

Correlation of personality with individual reproductive success in shrub-nesting birds depends on their life history style

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Avian Research 2024年第1期15卷 42-49页

作者： Jianchuan Li Wen Zhang Ningning sun Yujie Wang Lifang Gao Ran Feng liqing Fan Bo Du Tibet Museum of Natural Science Lhasa850011China School of Life Sciences Lanzhou UniversityLanzhou730000China Institute of Plateau Ecology Tibet Agricultural and Animal Husbandry UniversityLinzhi860000China

Two questions in the research of animal personality—whether there is a correlation between a personality trait and individual reproductive success,and what is the genetic basis underlying a personality trait—remain *** addressed these two questions in three shrub-nesting birds,the Azure-winged Magpie(Cyanopica cyanus,AM),White-collared Blackbird(Turdus albocinctus,WB),and Brown-cheeked Laughingthrush(Trochalopteron henrici,BL).The personality type of an individual was first identified according to its response to a territorial ***,we compared the fleeing distance,breeding parameters,and differential expressed genes(DEGs) in the brain transcriptome between bold and shy *** the three species,bold breeders exhibited more aggressiveness towards an intruder of their territory than did shy *** reproductive success of bold breeders was significantly higher than that of shy breeders in AM but not in WB and *** three species shared one DEG,crabp1,which was up-regulated in bold relative to in shy *** regulating the expression of corticotropin-releasing hormone,higher crabp1 gene expression can decrease cellular response to retinoic ***,bold individuals are insensitive to external stresses and able to exhibit more aggressiveness to intruders than their shier *** is beneficial to bold individuals in AM but not in WB and BL because the former could evoke neighbors to make the same response of defending against intruders but the latter could *** a personality trait may have the same genetic basis across species,its correlation with reproductive success depends largely on the life history style of a species.

关键词： Boldness Life history style Personality Reproductive success Transcriptome analysis

DESIGN AND EXPERIMENT OF ELECTRIC BUS

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Chinese Journal of Mechanical Engineering 2002年第1期15卷 57-61页

作者： sun Fengchun Chen Yong Zhang Chengning sun liqing School of Vehicle and Transportation Engineering，Beijing Institute of Technology， Beijing 100081，China School of Vehicle and Transportation Engineering Beijing Institute of Technology 北京 100081

Performance and reliability experiments on BJD-6100EV electric buses, jointlydeveloped by Beijing Institute of Technology and Beijing Public Transport Company, are *** power model of battery pack is established and maximum output power is analyzed. A permanentmagnetic direct current (PMDC) motor with enhanced windings is developed for the bus. Torque-speedcharacteristics of the motor are modeled and performance of electric bus is analyzed. Computationalmethod of the range of electric bus is proposed and discussed. Experiments show that electric buscan realize design requirements. Computational methods are verified with the help of field test. Itis expected that design and computation method will provide helpful reference to development ofelectric vehicles.

关键词： Electric bus Storage battery Electric motor Range Performancecharacteristics

Simulation of Restraint System Performance upon the Occupant's Response During Impact

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Journal of Beijing Institute of Technology 1999年第2期8卷 96-102页

作者：孙立清林逸孙逢春北京理工大学车辆工程学院吉林工业大学汽车工程学院

目的研究约束系统特性对乘员碰撞响应的影响规律，为约束系统设计提供依据．方法以多体系统动力学和经典碰撞动力学的基本理论为依据，利用ＲＷ方法建立了具有１４个刚体、３７个自由度、带滑移铰的汽车乘员多体系统碰撞仿真模型，... 详细信息

目的研究约束系统特性对乘员碰撞响应的影响规律，为约束系统设计提供依据．方法以多体系统动力学和经典碰撞动力学的基本理论为依据，利用ＲＷ方法建立了具有１４个刚体、３７个自由度、带滑移铰的汽车乘员多体系统碰撞仿真模型，并开发了相应的仿真软件ＳＶＣ３Ｄ．结果仿真和试验结果基本一致；伸展率较小或配备了预紧器的约束系统约束效果好．结论所建立模型和所开发软件是正确的；在一定范围内，应采用伸展率较小的安全带并应配备安全带预紧器。

关键词：汽车-乘员多体系统模型多体系统动力学碰撞动力学计算机仿真汽车被动安全性

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基于扰动补偿的电机模拟器电流控制策略

电工技术学报 2023年第22期38卷 5987-5998页

作者：王泽尚孙立清王志福潘琼北京理工大学电动车辆国家工程研究中心北京100081 北京理工大学长三角研究院嘉兴314011

针对传统PI控制的低通滤波特性对电机模拟器动态控制效果的限制以及传统开环控制策略易受参数扰动影响的问题,该文提出一种基于滑模扰动观测器的开环电流控制策略。首先,根据目标电机数学模型以及接口电路模型推导出不带微分计算的开环... 详细信息

针对传统PI控制的低通滤波特性对电机模拟器动态控制效果的限制以及传统开环控制策略易受参数扰动影响的问题,该文提出一种基于滑模扰动观测器的开环电流控制策略。首先,根据目标电机数学模型以及接口电路模型推导出不带微分计算的开环控制电压方程;其次,为了解决传统开环控制易受参数扰动影响的问题,设计滑模扰动观测器进行扰动观测;最后,通过实验对比了该文所提控制策略与PI控制和传统开环控制的控制效果。实验结果表明,在存在参数扰动时,该文所提的控制策略无论在瞬态或稳态工况,均比基于传统PI控制和开环控制策略的电机模拟器系统具有更高的模拟精度与准确性。

关键词：电机模拟器开环控制 PI控制扰动观测器

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锂离子电池外部短路电压行为预测模型评价

机械工程学报 2023年第2期59卷 199-211页

作者：燕润博孙立清杨瑞鑫熊瑞北京理工大学机械与车辆学院北京100081

锂离子电池外部短路瞬间产生大电流引发安全事故频繁发生,精确的模型是风险预警的基础。围绕外部短路故障,从不同初始荷电状态(State of charge,SOC)、不同温度两方面开展了Thevenin等效电路模型与单粒子电化学模型的电压预测精度评价... 详细信息

锂离子电池外部短路瞬间产生大电流引发安全事故频繁发生,精确的模型是风险预警的基础。围绕外部短路故障,从不同初始荷电状态(State of charge,SOC)、不同温度两方面开展了Thevenin等效电路模型与单粒子电化学模型的电压预测精度评价与复杂性对比。结果表明,Thevenin模型精度随初始SOC降低而下降,随环境温度升高上升;单粒子模型精度受初始SOC影响较小,随温度升高先上升后下降。针对Thevenin模型短路中精度下降等问题,提出了应用电感元件的模型优化方法。模型方均根误差小于60 mV,精度提升了76%;针对单粒子模型在外部短路大电流中精度变差的问题,提出了使用双电层放电和锂离子扩散限制进行建模的模型优化方法。模型方均根误差小于40 mV,精度提升了64%。优化后的模型分析结果表明:Thevenin模型实时性高,单粒子模型弥补了电池漏液时Thevenin模型的失效,但计算复杂;前者可用在外部短路的前期诊断和预警中,后者可用在外部短路发生后的热管理或热安全研究中。

关键词：锂离子电池电池安全外部短路模型性能评价模型优化

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农村水利工程中BIM技术应用的思考

山西水利 2022年第5期38卷 46-47页

作者：孙丽卿曲沃县水利局山西曲沃043400

建筑信息模型BIM技术,是建筑学、工程学及土木工程的信息化工具,是对传统建筑行业的信息革命。文章根据农村水利供水工程建设一线工作的实践与思考,提出了BIM在水利工程合同和资料储存管理、GIS+BIM技术在工程设计环节、BIM技术在施工中... 详细信息

建筑信息模型BIM技术,是建筑学、工程学及土木工程的信息化工具,是对传统建筑行业的信息革命。文章根据农村水利供水工程建设一线工作的实践与思考,提出了BIM在水利工程合同和资料储存管理、GIS+BIM技术在工程设计环节、BIM技术在施工中、BIM技术在项目等工程管理的几个重要环节中的应用。

关键词： BIM技术农村水利工程信息管理运维管理