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基于自适应预瞄路径的非连续曲率轨迹跟踪控制方法

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重庆理工大学学报（自然科学） 2024年第2期38卷 87-98页

作者：李杭宇刘冉冉姜宇王文豪李峰郭威江苏理工学院汽车与交通工程学院江苏常州213001

针对智能车辆在复杂道路工况下跟踪效果不佳的问题,在考虑车辆转向安全的前提下,提出了一种非连续曲率轨迹跟踪控制策略。基于道路曲率、车速指标的影响,设计一种改进的预瞄误差模型,结合安全速度约束建立自适应预瞄控制器,以五次多项... 详细信息

针对智能车辆在复杂道路工况下跟踪效果不佳的问题,在考虑车辆转向安全的前提下,提出了一种非连续曲率轨迹跟踪控制策略。基于道路曲率、车速指标的影响,设计一种改进的预瞄误差模型,结合安全速度约束建立自适应预瞄控制器,以五次多项式拟合得到预瞄路径及道路曲率,并根据预瞄式位置几何原理,设计驾驶员转向模型,推导前轮转角方程。通过Matlab/Simulink、Carsim、Prescan搭建联合仿真平台,选取双移线、非连续曲率轨迹、连续换道工况进行对比实验。结果表明:在以上工况下,文中提出的控制算法能实现预瞄路径随外界条件变化自适应调节,在保证车辆行驶稳定性、安全性、适应性的同时,跟踪精度分别提高了55.34%、65.86%、46.00%。

关键词：智能车辆轨迹跟踪曲率预瞄路径自适应控制

Preparation,Properties,and Applications of Natural Cellulosic Aerogels:A Review

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能源与人工环境(英文) 2020年第1期1卷 60-76页

作者： Ahsan Zaman Fei Huang Man jiang wei wei Zuowan Zhou Key Laboratory of Advanced Technologies of Materials(Ministry of Education) School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuan 610031China

With the depletion of fossil fuel and increasing environmental concerns,the modernized era of technology is urgently in need for sustainable and eco-friendly *** industrial sector certainly possesses enough resources for the production of available cost-effective,renewable,reusable,and sustainable raw ***-tralight,eco-friendly and renewable cellulosic aerogels are one of the most accentuated materials in the polymer research field due to their highly abundant and inexpensive raw material,biocompatibility,high specific surface area and other feasible *** review summarizes the recent progress in cellulosic aerogels,their main processing route,including a detailed description of versatile new solvents along with some essential properties of cellulosic aerogels and illustrate how their variety of chemical functionalities can be adjusted for applications in the fields of thermal insulation,fire retardant,antibacterial,CO 2 capture and energy storage systems.A de-tailed morphological analysis has been elaborated and effect of processing route,solvent medium and drying procedure on the morphology of cellulosic aerogels is also ***,we propose some suggestions to the functionalization such as silanized cellulosic aerogels and their applications in antibacterial activity yet they are still in progress and need further study for future research.

关键词： Cellulose aerogel Lignocellulose Cellulose solvents Functionalized cellulose Microstructure-related properties

不同尾气热管理策略对当量天然气发动机WHTC循环排放的影响

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车用发动机 2024年第2期 53-59页

作者：邓远海宁德忠蒋继潘恒斌付长城官维广西玉柴机器股份有限公司广西玉林537005 广西大学机械工程学院广西南宁530004

国六天然气发动机采用等当量燃烧结合外部冷却EGR及TWC的排放控制技术路线,TWC的转化效率是保证发动机排放达标的重要因素,而催化器的入口温度是决定TWC转化效率高低的最重要影响参数之一。然而,在冷起动阶段及排气管路温降较大的情况下... 详细信息

国六天然气发动机采用等当量燃烧结合外部冷却EGR及TWC的排放控制技术路线,TWC的转化效率是保证发动机排放达标的重要因素,而催化器的入口温度是决定TWC转化效率高低的最重要影响参数之一。然而,在冷起动阶段及排气管路温降较大的情况下,存在TWC入口尾气温度难以满足发动机及整车排放高效转化需求的问题。针对该问题,在一台4.5 L排量的发动机和一辆搭载该发动机的城市环卫车上探究不同尾气热管理策略对发动机WHTC循环排放及整车作业循环排放的影响。研究结果表明:采用起动快速温升的尾气热管理策略,能有效提高冷起动阶段发动机尾气温度,WHTC循环的TWC入口温度达到300℃所需时间缩短了300 s,显著降低了NO_(x),CH 4和CO循环排放,降幅分别达到38.5%,38.5%和5.8%;采取在TWC上增加金属载体前级方案的尾气控制策略,WHTC循环的NO_(x),CH 4和CO循环排放分别降低了62.2%,42.8%和15.7%;采用对整车排气尾管包裹的尾气热管理策略,在整车作业循环工况下,TWC入口温度相比采用普通石棉包裹的方案提高了近200℃,使得NO_(x)瞬时排放值30 s平均值的最大值降低了60.9%,能更好地满足北京第六阶段的排放法规要求。

关键词：天然气发动机当量燃烧尾气热管理冷起动排气温度

Study on a segmented electro-pneumatic braking system for heavy-haul trains

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Transportation Safety and Environment 2020年第3期2卷 216-225页

作者： wei wei Yong jiang Yuan Zhang Xubao Zhao Jun Zhang Dalian Jiaotong University 794 Huanghe RoadShahekou DistrictDalianLiaoning116208China Meishan CRRC Brake Science&Technology 683rd RoadScience and Technology Industrial ParkMeishanSichuan620010China

The large longitudinal impact of heavy-haul trains is the main factor limiting their development,and the asynchronous nature of train-braking systems is the main cause of this longitudinal *** this paper,a segmented electro-pneumatic braking solution fully compatible with the existing freight-train braking system in China is proposed to improve the synchrony of train-braking systems.A simulation model for this braking system is developed based on air-flow theory,the 120 distribution valve and electronic control *** braking characteristics obtained from simulations are compared to those from the train-brake testing platform,and show high *** this basis,the effects of the new braking system on the braking capacity and longitudinal impact of a 20000 t heavy-haul train are analysed by further *** results show that during service brakes,the segmented electro-pneumatic braking system can increase the braking capacity by 4.2–24.7%and reduce the coupler force by 21.6–68.0%.Therefore,it can be seen that the segmented electro-pneumatic braking system is a new type of electro-pneumatic brake that meets the needs of the Chinese railway *** solves the problem of the longitudinal impact of heavy-haul trains satisfactorily,and its compatibility with the existing braking system(resulting in a reduced modification workload)makes it possible to maintain normal operations on heavy-haul lines while trains undergo modification.

关键词： pneumatic brake electro-pneumatic brake air-flow heavy-haul train braking characteristics longitudinal dynamics coupler force

Genome-wide identification of imprinted genes in pigs and their different imprinting status compared with other mammals

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Zoological Research 2020年第6期41卷 721-725页

作者： Yin-Qiao Wu Heng Zhao Ying-Ju Li Saber Khederzadeh hong-jiang wei Zhong-Yin Zhou Ya-Ping Zhang State Key Laboratory of Genetic Resources and Evolution and Yunnan Laboratory of Molecular Biology of Domestic AnimalsKunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China Kunming College of Life Science University of Chinese Academy of SciencesKunmingYunnan 650204China Key Laboratory of Animal Gene Editing and Animal Cloning in Yunnan Province Yunnan Agricultural UniversityKunmingYunnan 650201China Center for Excellence in Animal Evolution and Genetics Chinese Academy of SciencesKunmingYunnan 650223China

DEAR EDITOR,Genomic imprinting often results in parent-of-origin specific differential expression of maternally and paternally inherited alleles and plays an essential role in mammalian development and *** genomic imprinting has primarily been studied in mice and humans,with only limited information available for *** systematically characterize this phenomenon and evaluate imprinting status between different species,we investigated imprinted genes on a genome-wide scale in pig brain tissues.

关键词： imprinting imprint primarily

Gefapixant,a Novel P2X3 Antagonist,Protects against Post Myocardial Infarction Cardiac Dysfunction and Remodeling Via Suppressing NLRP3 Inflammasome

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Current Medical Science 2023年第1期43卷 58-68页

作者： Yan-zhao wei Shuang YANG wei LI Yan-hong TANG Department of Cardiology Renmin Hospital of Wuhan UniversityWuhan430060China Cardiovascular Research Institute Wuhan UniversityWuhan430060China Hubei Key Laboratory of Cardiology Wuhan430060China Department of Cardiology Wuhan No.1 HospitalWuhan Hospital of Traditional Chinese and Western MedicineWuhan430022China

Objective The ATP responsive P2 purinergic receptors can be subdivided into metabotropic P2X family and ionotropic P2Y *** these,P2X3 is a type of P2X receptor which is specifically expressed on nerves,especially on pre-ganglionic sensory *** study investigates whether gefapixant possesses the potential of inhibiting cardiac sympathetic hypersensitivity to protect against cardiac remodeling in the context of myocardial *** The Sprague-Dawley rats were divided randomly into three groups:sham group-myocardial infarction group,and myocardial infarction with gefapixant treatment *** infarction was induced by left anterior descending branch *** gefapixant solution was intraperitoneally injected each time per day for 7 days and the appropriate dosage of gefapixant was determined according to the results of hematoxylin-eosin(HE)staining and myocardial injury *** of cardiac function were assessed by echocardiograph and cardiac fibrosis was evaluated by Western blotting and immunofluorescence staining of collagen I and collagen *** sympathetic innervation was detected by norepinephrine concentration(pg/mL),in-vivo electrophysiology,and typical sympathetic *** cell infiltration was shown from immunofluorescence staining and pro-inflammatory signaling pathway activation was checked by immunohistology,quantitative realtime PCR(qPCR)and Western *** It was found that gefapixant injection of 10 mg/kg per day had the highest dosage-efficacy ***,gefapixant treatment improved cardiac pump function as shown by increased LVEF and LVFS,and decreased LVIDd and *** expression levels of collagen I and collagen III,and TNF-αwere all decreased by P2X3 ***,the decreased activation of nucleotide-binding and oligomerization domain-like receptors family pyrin-domain-containing 3(NLRP3)inflammasome and subsequent cleavage of caspase-1 which modula

关键词： myocardial infarction P2X3 inhibition gefapixant nucleotide-binding and oligomerization domain-like receptors family pyrin-domain-containing 3 inflammasome sympathetic nerve

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建筑幕墙预埋件施工质量问题及处治措施

工程建设与设计 2024年第4期 244-246页

作者：黄友江郭明黄政围黄骊蔚潮威建设科技(广州)有限公司广州510630

以广州市广发银行总部大楼幕墙建设项目为依托,提出预埋件质量问题三分类方案并制定相应的处治措施;对广州市黄埔区红山街某金融商业大厦幕墙预埋件质量检测结果统计分析。结果表明,Ⅱ类预埋件位置偏差问题出现频次最高,占比为64.4%,针... 详细信息

以广州市广发银行总部大楼幕墙建设项目为依托,提出预埋件质量问题三分类方案并制定相应的处治措施;对广州市黄埔区红山街某金融商业大厦幕墙预埋件质量检测结果统计分析。结果表明,Ⅱ类预埋件位置偏差问题出现频次最高,占比为64.4%,针对此制订了预埋件位置偏差纠正方案,依据偏差程度制定对应的纠偏措施,预埋件质量检测结果总合格率为95.8%,达到缩短工期的目的。

关键词：建筑幕墙预埋件质量问题分类

鉴别6种常见食用肉类的多重PCR检测体系的构建及验证

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法医学杂志 2024年第3期40卷 254-260页

作者：蒋志伟夏若成陶瑞旸李成涛温州医科大学基础医学院法医学系浙江温州325035 司法鉴定科学研究院上海市法医学重点实验室司法部司法鉴定重点实验室上海市司法鉴定专业技术服务平台上海200063

目的建立一种快速、准确、灵敏的多重PCR检测方法,用于同时鉴别6种常见食用肉类(牛、羊、鸡、猪、鹅、鸭),并评估其在肉类食品掺假鉴定中的应用价值。方法基于GenBank数据库中6个物种的线粒体全基因组序列,筛选具有种内保守性、种间特... 详细信息

目的建立一种快速、准确、灵敏的多重PCR检测方法,用于同时鉴别6种常见食用肉类(牛、羊、鸡、猪、鹅、鸭),并评估其在肉类食品掺假鉴定中的应用价值。方法基于GenBank数据库中6个物种的线粒体全基因组序列,筛选具有种内保守性、种间特异性的DNA序列(牛16S rRNA、羊COX-1、鸡Cytb、猪COX-1、鹅NADH2、鸭16S rRNA),并设计物种特异性引物,以此构建一个可同时鉴别6种常见食用肉类的多重PCR检测体系。对该体系进行种属特异性、灵敏度和重复性研究,并进行模拟混合样品检测。结果成功构建了一个可同时鉴别6种常见食用肉类的多重PCR检测体系,该体系在非目标物种的DNA中均未有效扩增;在DNA模板量为0.0625~2ng/μL时,6个物种的扩增产物均能检见。在鸭肉和牛肉混合比例低至0.5%时,仍能检测到鸭肉成分。结论本研究构建了一个特异性强、灵敏度高、重复性好的多重PCR检测体系,可准确鉴别6种常见食用肉类食品中的动物源性成分,为我国常见食用肉类及肉制品的掺假鉴定提供了一种简单、实用的检测技术。

关键词：法医物证学线粒体DNA 多重PCR 种属鉴定食用肉类

婴幼儿辅助食品中配料和膳食补充成分对酪蛋白磷酸肽持钙能力的影响

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中国食品添加剂 2024年第5期35卷 224-232页

作者：姜春秀全威陈洁贺来健贝亲管理(上海)有限公司上海200030 江南大学食品科学与资源挖掘国家重点实验室无锡214122 湖南农业大学食品科学技术学院长沙410128

比较研究婴幼儿辅助食品中肉类、果蔬和谷物等配料以及维生素和蛋白质等膳食补充成分,对三种酪蛋白磷酸肽产品持钙能力强弱的影响。研究结果表明,大米和小麦对婴幼儿辅助食品中酪蛋白磷酸肽的持钙能力有一定的不良影响,但大米和小麦添... 详细信息

比较研究婴幼儿辅助食品中肉类、果蔬和谷物等配料以及维生素和蛋白质等膳食补充成分,对三种酪蛋白磷酸肽产品持钙能力强弱的影响。研究结果表明,大米和小麦对婴幼儿辅助食品中酪蛋白磷酸肽的持钙能力有一定的不良影响,但大米和小麦添加量在50%~85%的范围未显著改变酪蛋白磷酸肽的持钙能力。添加3%以上的肉类和果蔬类配料的添加量显著降低了酪蛋白磷酸肽的持钙能力。20 mg/kg的烟酰胺降低了酪蛋白磷酸肽的持钙能力,而其它维生素、乳清蛋白和大豆蛋白则未对其产生显著影响。进一步分析发现,肉类配料中脂肪和蛋白质以及果蔬类配料中的酚类化合物可能是影响酪蛋白磷酸肽持钙能力的关键因素。本文对于明确婴幼儿辅助食品中影响酪蛋白磷酸肽持钙能力的因素,使其更好地发挥功效具有一定的指导意义。

关键词：婴幼儿辅助食品酪蛋白磷酸肽持钙能力辅食配料膳食补充成分