检索结果-南通市图书馆

Journal of Thermal Science 2023年第2期32卷 628-642页

作者： ZHANG Jinglong HU Xingjun LUO yufei HUI Zheng WANG Jingyu yu tianming State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022China Automobile Research Institute of China Heavy Duty Automobile Group Co.Ltd. Ji'nan 250031China

In this paper,a novel composite heat transfer enhancement technique comprised of louvered fins(LFs)and rectangular wing vortex generators(RWVGs)is proposed to improve the LF side thermal-hydraulic performance of louvered fin and flat tube heat exchangers(LFHEs).After validation of the LF side pressure dropΔP and heat transfer coefficient hLFof the baseline by experiments,the numerical method is applied to investigate the influential mechanisms of the RWVG parameters(the number N(7 to 15),attack angleβ(30°to 90°),height H_(VG)(0.8 mm to 2 mm)and width W_(VG)(0.8 mm to 1.2 mm))on the performance of the LFHE in the velocity range of 3 m/s to 10 m/*** show that thermal-hydraulic performance of the LFHE is significantly impacted by the RWVGs,and according to the performance evaluation criteria(PEC),the LFHE achieves its optimal thermal-hydraulic performance when N=7,β=45°,H_(VG)=1.8 mm and W_(VG)=1 *** to the baseline,the maximum,minimum and average increments of PEC for the optimal case are 13.85%,4.67%and 8.39%,respectively.

关键词： composite heat transfer enhancement louvered fin rectangular wing vortex generator numerical simulations thermal-hydraulic performance

CD4^(+)T cell metabolism,gut microbiota,and autoimmune diseases:implication in precision medicine of autoimmune diseases

在线全文

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2022年第3期5卷 176-186页

作者： Wenjing Yang tianming yu Yingzi Cong Department of Microbiology and Immunology University of Texas Medical BranchGalvestonTX 77555USA Sealy Center for Microbiome Research University of Texas Medical BranchGalvestonTX 77555USA

CD4^(+)T cells are critical to the development of autoimmune ***,fatty acids,and glutamine metabolisms are the primary metabolic pathways in immune cells,including CD4^(+)T *** distinct metabolic programs in CD4^(+)T cell subsets are recognized to reflect the bioenergetic requirements,which are compatible with their functional *** microbiota affects T cell responses by providing a series of antigens and *** data indicate that CD4^(+)T cell metabolic pathways underlie aberrant T cell functions,thereby regulating the pathogenesis of autoimmune disorders,including inflammatory bowel diseases,systemic lupus erythematosus,and rheumatoid ***,we summarize the current progress of CD4^(+)T cell metabolic programs,gut microbiota regulation of T cell metabolism,and T cell metabolic adaptions to autoimmune disorders to shed light on potential metabolic therapeutics for autoimmune diseases.

关键词： immunometabolism gut microbiota metabolic adaption autoimmune disorders

Effect of Cu（Ⅱ） on Degradation and Decolorization of Rhodamine B in Subcritical Water

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2017年第4期33卷 643-647页

作者： CHENG Kai YANG Wei WANG Hui ZHOU Jie WU Shengji yu tianming PAN Jianbo College of Materials and Environmental Engineering Hangzhou Dianzi University Hangzhou 310018 P. R. China Eanlu Environment Technology Co. Ltd. Quzhou 324000 P R. China

In this paper, subcritical water, an environmentally friendly solvent, was employed to degrade rhodamine B, which served as a model dye in textile industrial effluents. The effect of Cu（Ⅱ） on the degradation of rhodamine B was evaluated. Further, the degradation kinetics of rhodamine B in subcritical water was evaluated via a Weibull model. The results show that subcritical water could efficiently degrade and decolorize rhodamine B. The addition of Cu（Ⅱ） into subcritical water could accelerate the degradation of rhodamine B and lower the temperature for its com- plete degradation. The Weibull equation could well express the degradation kinetics of rhodamine B. The calculated rate constants showed Arrhenius behavior and presented high correlation coefficients. The activation energy was 109.4 kJ/mol for subcritical water degradation of rhodamine B, whereas it became lower（93.4 kJ/mol） when Cu（Ⅱ） was added to the subcritical water. The frequency factors for the degradation of rhodamine B by subcritical water without and with Cu（Ⅱ） were calculated to be 1.0×10n and 3.2×109 min-1, respectively. The above results indicate that subcritical water treatment is a promising process for degrading and decolorizing textile dyes. The results will provide a theoretic support for the industrial application of subcritical water treatment.

关键词： Subcritical water Degradation kinetics Rhodamine B Weibull equation Copper ion

电控机械式自动变速器离合器灰色预测PID控制技术

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

农业机械学报 2011年第8期42卷 1-6页

作者：余天明郑磊李颂吉林大学汽车工程学院长春130025 中国第一汽车集团公司技术中心长春130011 空军航空大学航空理论系长春130022

离合器控制的优劣是影响机械式自动变速车辆起步和换挡平顺性的最重要因素,传统PID控制方法难以对电控机械式自动变速器(AMT)离合器这种复杂的大滞后、非线性系统进行精确控制。对灰色预测PID控制在AMT离合器控制中的应用进行了深入研究... 详细信息

离合器控制的优劣是影响机械式自动变速车辆起步和换挡平顺性的最重要因素,传统PID控制方法难以对电控机械式自动变速器(AMT)离合器这种复杂的大滞后、非线性系统进行精确控制。对灰色预测PID控制在AMT离合器控制中的应用进行了深入研究,与传统控制方法相比,该方法提高了离合器的控制精度。灰色预测PID控制使控制系统的灰量得到一定程度的白化,提高了控制的质量和鲁棒性,有效解决了离合器控制的超调和震荡问题,提高了车辆起步与换挡的平顺性。

关键词：电控机械式自动变速器离合器换挡品质灰色预测

在线全文

学校读者我要写书评

暂无评论

移动式架车机单点自动润滑装置研究

城市轨道交通研究 2012年第7期15卷 117-119页

作者：余添明广州市地下铁道总公司广州助理工程师510380

为改善移动式架车机润滑效果,研制了一种弹簧储能的单点自动润滑装置。介绍了弹簧储能式单点自动润滑装置的原理、弹簧储能式润滑罐以及自动润滑装置的控制。该装置可实现对移动式架车机高效可行的自动润滑。

关键词：移动式架车机单点自动润滑弹簧储能

Superior cortical screw in Lumbar spine:a biomechanical and micro-structure based study in osteoporotic human vertebrae

在线全文

学校读者我要写书评

暂无评论

Superior cortical screw in Lumbar spine:a biomechanical and ...

2016年浙江省骨科学学术年会

作者： yu tianming Zhang Xuyang Liu Junhui Li Shengyun Fan Shunwu Zhao Fengdong Department of Orthopaedics Sir Run Run Shaw HospitalSchool of MedicineZhejiang University

Objective:To verify the pullout strength of superior cortical screw(SCS) of osteoporotic lumbar spine was higher than Magerl’ method by means of biomechanical test and microarchitecture ***:Osteoporosis reduces the bone-screw purchase,and potentially decreases screw pullout strength and other biomechanical ***,there are various entry points adopted for pedicle *** of pedicle screw insertion design to improve screw stabilization may help tocompensate for the detrimental effects of decreased vertebral bone mineral ***:In our study,two modes of screw insertion were performed in 13 cadaveric lumbar vertebrae:Magerl’ method in the left pedicle,and SCS method in the right(its entry point located vertically 3-4 mm over Magerl’ point).The pedicle and its corresponding vertebral body were divided into six levels equally and tested by micro-CT before and after screw fixations,especially the bone surrounding *** screw pullout strength was tested ***:BMD,BV/TV,Tb.N,*** and *** were significantly different between the upper and the middle thirds of the lumbar spine(p<0.05).And values of BMD,BV/TV,Tb.N,*** in the upper third varied every2 millimeters in thickness(p<0.05).When related to pedicle only,values of BMD,BV/TV,Tb.N,*** and *** were statistically different between the upper and the middle thirds(p<0.05).Biomechanical test showed pullout strength was elevated 22.4%by SCS,comparing with Margerl’ method(p<0.05).Furthermore,the pullout strengthwas statistically correlated to BMD(r=0.573,p=0.002),BV/TV(r=0.529,p=0.006) and ***(r=0.515;p=0.007).Conclusions:The bone structure is denser both in the upper third of the lumbar vertebrae and the pedicle,which contributes to the elevated pullout strength of pedicle *** cortical screw for screw insertion may be another alternative technique in posterior lumbar instrumentation,especially in osteoporotic patients.

关键词： pedicle screw lumbar spine micro-CT pullout strength osteoporosis

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

激光拼焊板制车门内板冲压成形数值仿真

农业工程学报 2014年第15期30卷 46-53页

作者：余天明李颂兰巍郑磊厍军威吉林大学汽车工程学院长春130022 空军航空大学航空理论系长春130022 中国第一汽车集团公司技术中心长春130011

激光拼焊板制车门内板不仅可以优化零件结构,还可以有效降低车门内板重量,但激光拼焊板制车门在成形中容易出现破裂和焊缝移动的现象。针对激光拼焊板制车门成形中容易出现质量问题,为提高零件工艺设计的效率,利用Dynaform软件对其建立... 详细信息

激光拼焊板制车门内板不仅可以优化零件结构,还可以有效降低车门内板重量,但激光拼焊板制车门在成形中容易出现破裂和焊缝移动的现象。针对激光拼焊板制车门成形中容易出现质量问题,为提高零件工艺设计的效率,利用Dynaform软件对其建立了冲压成形的有限元仿真模型,在数值仿真过程中,对焊缝处采用共节点的简化建模方式,通过对冲压边界条件的调整,确定了压边力为1 050 kN、拉深筋高度为6.5 mm和摩擦系数为0.05的充分润滑状态,仿真和试验结果表明:车门内板冲压成形后的焊缝处的厚度的计算结果与试验数据具有良好的一致性,并预测焊缝向薄板方向的最大移动量为6.61 mm。和实测值7.31 mm的误差为0.7 mm,能较准确预测焊缝的移动量,验证了仿真模型的准确性。该研究方法可为激光拼焊板制车身覆盖件的工艺设计及模具设计提供指导和依据。

关键词：数值仿真冲压成形激光焊接车门内板焊缝移动

Intelligent interaction system based on multimodal conformal triboelectric nanogenerator patch for disabled sports and life

在线全文

学校读者我要写书评

暂无评论

Science China Technological Sciences 2025年

作者： yuzhang WEN Mengqi ZHANG Zhenning XIE Zida AN Bing LIU Fengxin SUN tianming ZHAO Zuojun yu Fei WANG yupeng MAO Physical Education Department Northeastern University(Shenyang) Faculty of Robot Science and Engineering Northeastern University Criminal Investigation Police University of China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences China Ice Sports College Beijing Sport University

Intelligent interaction technology based on advanced sensing units has become a research hotspot. In this paper, an intelligent interaction system (IIS) based on a multimodal conformal triboelectric nanogenerator patch (MCTP) is reported for sports monitoring and life promotion of the disabled. This IIS consists of a cloud-based smart sports recognition program and a smart life application. The porous micro-reinforced structure of polyurethane (PU) Sponge&Ecoflex, and the surface modification of PTFE by coating it with MXene endows the MCTP with excellent electrical properties. It shows good angle and force sensitivities of 1.1 V/°and 1.61 V/N, respectively, and has an ultra-fast response time of 15 ms, meeting the needs of human motion monitoring. The MCTP can also capture the mechanical energy, producing a maximum output power of 139μ*** with the commercial inertial measuring unit (IMU), the MCTP shows better consistency in human joint angle sensing. A precise analysis of wheelchair curling sports monitoring points is achieved by combining the MCTP and the human anatomy model. The cloud-based smart sports recognition program utilizes machine learning to achieve visual feedback on the three throwing technologies of draw, takeout and clearing. In addition, the developed smart life application uses a highsensitivity MCTP-sensor array design to achieve a variety of smart home interactions through simple finger touches. Overall,the IIS integrates the three major functions of smart sports sensing, energy capture, and smart home control, providing important application prospects in the fields of smart sports and human-computer interaction for the disabled.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

发动机凸轮挺杆摩擦副磨损原因分析

润滑与密封 2005年第1期30卷 120-121页

作者：吉建平于天明陆明蚌埠解放军汽车管理学院安徽蚌埠233011 解放军理工大学工程兵学院江苏南京210007

介绍了发动机凸轮挺杆副的磨损特点, 分析其磨损机理, 提出减少磨损的措施。

关键词：挺杆磨损原因发动机凸轮磨损机理摩擦副

铸铁结合剂金刚石砂轮ELID磨削硬质合金的性能研究

在线全文

学校读者我要写书评

暂无评论

金刚石与磨料磨具工程 2008年第6期28卷 5-8页

作者：朱从容李伟于天明浙江海洋学院机电工程学院机械系舟山316004 浙江工业大学机械制造及自动化教育部重点实验室杭州310014

硬质合金具有硬度高、强度好、耐腐蚀和耐磨损的特点,采用传统方法难以满足精密及超精密加工的技术要求。本文采用不同粒度的铸铁结合剂金刚石砂轮ELID镜面磨削硬质合金,得到了不同加工效率以及不同加工表面质量的硬质合金磨削效果,揭... 详细信息

硬质合金具有硬度高、强度好、耐腐蚀和耐磨损的特点,采用传统方法难以满足精密及超精密加工的技术要求。本文采用不同粒度的铸铁结合剂金刚石砂轮ELID镜面磨削硬质合金,得到了不同加工效率以及不同加工表面质量的硬质合金磨削效果,揭示了不同粒度砂轮其磨削性能变化的规律与作用。实验结果表明:在相同的进给量下,粗粒度砂轮的磨削效率较高,能更好地控制工件的尺寸精度。细粒度砂轮则磨削效率较低,但能获得优良的加工表面质量。砂轮表面的氧化膜在磨削过程中扮演非常重要的角色,磨粒的粒径与砂轮表面氧化膜厚度的比值大小决定了砂轮的磨削性能。氧化膜的形成又受到电解参数的影响,可以通过对电解参数的调节实现高效率高精度的ELID磨削。

关键词：铸铁结合剂金刚石砂轮在线电解修整磨削性能表面质量