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Effects of working parameters on gasoline engine exergy balance

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Journal of Central South University 2013年第7期20卷 1938-1946页

作者： LIU Jing-ping FU Jian-qin feng ren-hua ZHU Guo-hui Research Center for Advanced Powertrain Technology Hunan University Changsha 410082 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body (Hunan University) Changsha 410082 China

To improve the energy utilization efficiency of internal combustion （IC） engine, exergy analysis was conducted on a passenger car gasoline engine. According to the thermodynamic theory of IC engine, in-cylinder exergy balance model was built. The working processes of gasoline engine were simulated by using the GT-power. In this way, the required parameters were calculated and then gasoline engine exergy balance was obtained by programming on computer. On this basis, the influences of various parameters on exergy balance were analyzed. Results show that, the proportions of various forms of exergy in gasoline engine from high to low are irreversible loss, effective work, exhaust gas exergy and heat transfer exergy. Effective exergy proportion fluctuates with cylinder volumetric efficiency at full load, while it always increases with break mean effective pressure （BMEP） at part load. Exhaust gas exergy proportion is more sensitive to speed, and it increases with speed increasing except at the highest speed. The lower proportion of heat transfer exergy appears at high speed and high load. Irreversible loss is mainly influenced by load. At part load, higher BMEP results in lower proportion of irreversible loss; at full load, the proportion of irreversible loss changes little except at the highest speed.

关键词： gasoline engine exergy balance waste heat recovery thermal efficiency energy conservation

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桥壳铸造工艺计算机模拟优化

铸造技术 2009年第6期30卷 834-836页

作者：任凤华航天科工集团第九研究院万山公司湖北孝感432000

铸造工艺计算机模拟技术让铸造工作者在工艺设计前或生产过程中进行工艺优化,省掉传统的编工艺-制模造型-试浇试铸-解剖铸件-修改工艺过程,缩短工艺试验或工艺改进的时间,减少工艺设计对经验的依赖,从而保持工艺设计水平稳定[1,2].

关键词：计算机模拟技术铸造工艺模拟优化桥壳生产过程工艺设计华铸CAE 工艺优化

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汽油机凸轮型线改进设计

湖南大学学报（自然科学版） 2009年第11期36卷 21-26页

作者：杨靖冯仁华邓帮林樊明明湖南大学机械与运载工程学院先进动力总成技术研究中心湖南长沙410082 湖南奔腾动力科技有限公司湖南长沙410205

应用配气机构模拟计算软件AVL-TYCON对国内某四缸汽油机配气机构进行运动学、动力学分析.结果显示,原机配气机构存在的进、排气门升程丰满系数较低,进排气凸轮与挺柱间的最大接触应力大等不足.本文根据其不足之处,通过重新设计进、排气... 详细信息

应用配气机构模拟计算软件AVL-TYCON对国内某四缸汽油机配气机构进行运动学、动力学分析.结果显示,原机配气机构存在的进、排气门升程丰满系数较低,进排气凸轮与挺柱间的最大接触应力大等不足.本文根据其不足之处,通过重新设计进、排气凸轮型线,解决了原机配气机构存在的问题,提高了配气机构的可靠性和寿命,而且提高了充气效率和发动机整机性能.

关键词：汽油机配气机构凸轮型线

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摩托车发动机性能优化

内燃机工程 2012年第1期33卷 67-71页

作者：刘敬平冯仁华杨靖王勇湖南大学先进动力总成技术研究中心长沙410082 湖南大学汽车车身先进设计制造国家重点实验室长沙410082

针对某摩托车发动机中速性能较差的情况,运用发动机性能模拟分析软件GT-Power对该机进行性能开发,找出了原机中转速性能差的原因。通过优化进排气凸轮型线、空滤器结构、排气管管长和管径,提高了发动机的充气效率和发动机整机性能。对... 详细信息

针对某摩托车发动机中速性能较差的情况,运用发动机性能模拟分析软件GT-Power对该机进行性能开发,找出了原机中转速性能差的原因。通过优化进排气凸轮型线、空滤器结构、排气管管长和管径,提高了发动机的充气效率和发动机整机性能。对优化后的发动机进行了台架试验,优化后发动机的最大扭矩为10.13N.m,最大功率为8.03kW。

关键词：内燃机摩托车发动机充气效率模拟性能优化

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工程场地动力特性分析的地脉动法

世界地震工程 2005年第4期21卷 139-142页

作者：郭明珠任凤华北京工业大学建筑工程学院北京100022 内蒙古赤峰市喀喇沁旗建设局内蒙古赤峰024400

简要地回顾了地脉动研究的历史,综述了地脉动在场地动力分析中应用的四种主要分析方法:直接富氏谱法、相对参考点谱比法、单点地脉动谱比法和利用地脉动反演场地剪切波速法。介绍各种分析方法的理论依据和适用条件,侧重分析了各种方法... 详细信息

简要地回顾了地脉动研究的历史,综述了地脉动在场地动力分析中应用的四种主要分析方法:直接富氏谱法、相对参考点谱比法、单点地脉动谱比法和利用地脉动反演场地剪切波速法。介绍各种分析方法的理论依据和适用条件,侧重分析了各种方法中存在的问题,论述了地脉动的应用前景和进一步研究的内容。

关键词：地脉动场地动力特性测试谱比法

Universal design of three-dimensional porous graphene-iron based promotors for kinetically rationalized lithium-sulfur chemistry

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Journal of Energy Chemistry 2025年第1期100卷 192-200页

作者： hua Gao Yunfeng Zhang Menglei Wang Ruoxuan Yang Shuai feng Xuan Cao Yaping Zhang Zhongyuan Lu Yingze Song State Key Laboratory of Environment-Friendly Energy Materials School of Materials and Chemistry Southwest University of Science and Technology School of Material Science and Engineering Henan University of Technology College of Chemistry and Chemical Engineering Taishan University

Lithium-sulfur （Li-S） batteries are widely deemed to be one of the most potential candidates for future secondary batteries because of their remarkable energy ***,notorious polysulfide shuttling and retarded sulfur reaction kinetics pose significant obstacles to the further application of Li-S *** rationally designed highly active electrocatalysts can facilitate polysulfide conversion,the universal and scalable synthesis strategies need to be ***,a universal synthetic strategy to construct a series of three-dimensional （3D） porous graphene-iron （3DGr-Fe） based electrocatalysts involving 3DGr-FeP,3DGr-Fe3C,and 3DGr-Fe3Se4is exploited for manipulating the Li-S redox *** has been observed that the implementation of a 3D porous Gr architecture leads to the well-designed conductive networks,while the uniformly dispersed iron nanoparticles introduce an abundance of active sites,fostering the lithium polysulfide conversion,thereby bolstering the overall electrochemical *** Li-S battery with the 3DGr-Fe based electrocatalyst exhibits remarkable capacity retention of 94.8%upon 100 times at 0.2 ***,the soft-packaged Li-S pouch cell based on such a 3DGr-Fe electrocatalyst delivers superior capacity of 1060.71 mA h g-1and guarantees for the continuous 30 min work of fan *** investigation gives comprehensive insights into the design,synthesis,and mechanism of 3DGr-Fe based electrocatalysts with high activity toward efficient and durable Li-S batteries.

关键词： Redox reactions

Searching for new drugs to treat Alzheimer’s disease dementia through multiple pathways

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World Journal of Clinical Cases 2025年第1期13卷 22-28页

作者： hua Bai Xiao-feng feng Department of Neurology The Third Affiliated Hospital of Guizhou Medical UniversityDuyun 558099Guizhou ProvinceChina Department of Neurology Wulong Branch of the People's Hospital Affiliated to Chongqing UniversityWulong 408500ChongqingChina Department of Neurology Guizhou Medical UniversityGuiyang 550004Guizhou ProvinceChina

Dementia is a group of diseases,including Alzheimer's disease(AD),vascular dementia,Lewy body dementia,frontotemporal dementia,Parkinson's disease dementia,metabolic dementia and toxic *** treatment of dementia mainly includes symptomatic treatment by controlling the primary disease and accompanying symptoms,nutritional support therapy for repairing nerve cells,psychological auxiliary treatment,and treatment that improves cognitive function through *** them,drug therapy to improve cognitive function is *** review focuses on introducing and commenting on some recent progress in exploring drugs to improve cognitive function,especially the new progress in drug treatment for *** mainly discuss the opportunities and challenges in finding and developing new therapeutic drugs from the aspects of acetylcholinesterase,N-methyl-D-aspartate glutamate receptor,amyloid protein,tau protein and chronic immune inflammation.

关键词： Alzheimer's disease Dementia Cholinesterase inhibitor Beta amyloid Tau protein

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边缘检测和小波变换在多聚焦图像中的应用

信息技术 2013年第2期37卷 24-27页

作者：任风华桂林电子科技大学电子工程与自动化学院广西壮族自治区桂林541004

根据多聚焦图像的特点,把边缘检测方法和小波变换融合算法结合起来,可以获得同一场景内所有物体都清晰的图像。首先利用高斯—拉普拉斯算子对源图像进行融合,得到边缘清晰的融合图像;接着对源图像进行小波变换,变换后的小波系数融合规... 详细信息

根据多聚焦图像的特点,把边缘检测方法和小波变换融合算法结合起来,可以获得同一场景内所有物体都清晰的图像。首先利用高斯—拉普拉斯算子对源图像进行融合,得到边缘清晰的融合图像;接着对源图像进行小波变换,变换后的小波系数融合规则采用选择融合和加权平均融合相结合,经反变换后得到整体清晰的图像;最后将边缘清晰融合图像与小波变换融合图像再一次融合,得到了清晰度增强的融合图像。仿真试验表明,边缘检测和小波变换相结合的融合方法可有效综合多聚焦图像。

关键词：多聚焦图像边缘检测小波变换融合算法图像融合

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基于MGCP的媒体网关控制器的分析与仿真

成都信息工程学院学报 2005年第5期20卷 523-526页

作者：任枫华电子科技大学计算机科学和工程学院四川成都610054

MGCP(Media Gateway Controll Protocol)作为一种著名的媒体网关控制协议,许多厂商都在它的基础上开发媒体网关(MG)及媒体网关控制器(MGC)。MG的开发离不开MGC的配合与支持,然而开发MGC的低效率、长周期往往成为MG开发的瓶颈。着眼于此... 详细信息

MGCP(Media Gateway Controll Protocol)作为一种著名的媒体网关控制协议,许多厂商都在它的基础上开发媒体网关(MG)及媒体网关控制器(MGC)。MG的开发离不开MGC的配合与支持,然而开发MGC的低效率、长周期往往成为MG开发的瓶颈。着眼于此,在介绍了基于MGCP的VoIP系统结构的基础上,引入一种VoIP仿真工具Artiza VoIP Simulator,接着详细描述了怎样通过此工具仿真MGC实现跨MG通话。

关键词： MGCP MGC MG voIP