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基于Modbus的双环路冗余总线控制器的设计与实现
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作者 黄文庆 李春杰 李伟华 《计算机应用与软件》 北大核心 2024年第11期273-278,共6页
针对传统过程控制系统的PLC/DCS对终端执行机构实时监测与控制导致系统资源消耗沉重,单点设备故障容易引发整个系统通信瘫痪等工业问题,为增强系统通信容错能力,使PLC与终端执行机构稳定可靠地连接,设计并实现基于Modbus的双环路冗余总... 针对传统过程控制系统的PLC/DCS对终端执行机构实时监测与控制导致系统资源消耗沉重,单点设备故障容易引发整个系统通信瘫痪等工业问题,为增强系统通信容错能力,使PLC与终端执行机构稳定可靠地连接,设计并实现基于Modbus的双环路冗余总线控制器。控制器内部采用双CPU冗余热备份设计,有效降低PLC的工作负担,提高了系统的鲁棒性和实时性,适用于工业现场。 展开更多
关键词 MODbuS 总线控制器 冗余
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Pang Fuwan Uses Yao Medicine to Observe the Therapeutic Effects on the Physical and Mental Symptoms of Patients with Advanced Non-Small Cell Lung Cancer
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作者 Qiuxiang Luo Qiongping Liang Xiaoyan Luo 《Pharmacology & Pharmacy》 2024年第3期62-69,共8页
Objective: Investigate the efficacy and safety of Yao Medicine in the treatment of advanced non-small-cell lung carcinoma, and explore the best therapeutic measure for clinical benefit. Methods: From July 2020 to July... Objective: Investigate the efficacy and safety of Yao Medicine in the treatment of advanced non-small-cell lung carcinoma, and explore the best therapeutic measure for clinical benefit. Methods: From July 2020 to July 2022, 84 patients with advanced non-small-cell lung carcinoma were selected and randomly divided into the Observation Group and control group, and the control group was treated with routine Western medicine, with 42 cases in each group. The activity of daily living (ADL) was assessed before and after treatment, meanwhile, the self-rating depression scale (SDS) and self-rating anxiety SAS (SAS) were used to assess the improvement of a bad mood, and quality of life SF-36 was used to assess the quality of life, to judge the efficacy and safety. Results: The effective rate of observation group was 91.67%. The effective rate of the control group was 76.19%. The effective rate of the observation group was significantly higher than that of the control group (P 0.05). There were no significant differences in the scores of SDS, SAS and quality of life between the two groups before treatment (P > 0.05), and after treatment, the scores of SDS, SAS and quality of life in the two groups were compared with those in the control group (P > 0.05), the scores of VAS, SDS and SAS decreased significantly, while ESCV, angle of straight leg elevation, ADL, physiological score, emotional score, social score and health status score increased significantly, the difference was statistically significant (P 0.05). Conclusion: Yao Medicine can improve the psychosomatic symptoms of patients with advanced non-small-cell lung carcinoma better, with better efficacy and higher safety. 展开更多
关键词 yao Medicine Non-Small-Cell Lung Carcinoma Advanced Stage EFFICACY Physical and Mental
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一种基于多谐振开关槽与Buck-Boost电路的准并联变换器
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作者 戴瑞然 马运东 +1 位作者 王鹏 王鹏飞 《电工技术学报》 EI CSCD 北大核心 2024年第18期5768-5785,共18页
谐振开关电容变换器具有效率高、体积小、质量轻和易集成等优点,是中间母线变换器的理想拓扑,然而其不足之处在于电压比固定以及软开关特性易受谐振参数容差的影响。该文针对这两个问题,将多谐振开关槽式变换器与四开关Buck-Boost变换... 谐振开关电容变换器具有效率高、体积小、质量轻和易集成等优点,是中间母线变换器的理想拓扑,然而其不足之处在于电压比固定以及软开关特性易受谐振参数容差的影响。该文针对这两个问题,将多谐振开关槽式变换器与四开关Buck-Boost变换器进行结合,提出一种基于准并联架构的中间母线变换器,详细分析变换器的工作原理与电压增益特性。通过推导电流时域表达式详细分析谐振参数容差对变换器的影响,并给出参数设计的方法。该文研究一种合适的控制方式,完成环路补偿设计,实现输出电压的闭环控制。通过仿真和实验对上述理论和解决方案进行验证。 展开更多
关键词 中间母线变换器 谐振开关电容变换器 多谐振开关槽式变换器 准并联架构
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英特尔内部三个独立BU联合开发基于FPGA的IPU
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作者 康文静 《微型计算机》 2024年第11期10-12,共3页
本文旨在为寻求洞察英特尔在开发基于FPGA的基础设施处理单元(IPU)方面的协作努力的读者提供信息。本文概述了英特尔的三个独立业务部门(DCG、PSG和NEX)之间跨职能合作的重要性,阐明了它如何增强了英特尔的市场地位并设立了新的行业标... 本文旨在为寻求洞察英特尔在开发基于FPGA的基础设施处理单元(IPU)方面的协作努力的读者提供信息。本文概述了英特尔的三个独立业务部门(DCG、PSG和NEX)之间跨职能合作的重要性,阐明了它如何增强了英特尔的市场地位并设立了新的行业标准。文章探讨了基于FPGA的IPU的适应性和实时决策能力,强调了它在数据中心、客户设备和物联网解决方案等多领域的多才多艺的应用,从而重塑了现代计算和连接的格局。除英特尔外,IPU的影响扩展到更广泛的科技行业,催生了创新,并鼓励在各个领域探索FPGA技术。这一合作项目凸显了英特尔不断拓展技术边界、弥合多元领域差距和推动科技领域的变革承诺,巩固了公司作为科技领域的领先者地位。 展开更多
关键词 英特尔 FPGA IPU bu
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线上中文学习平台Lingo Bus和Lingo Ace比较研究
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作者 李萌 吴应辉 《海南师范大学学报(社会科学版)》 2024年第1期101-108,共8页
Lingo Bus和Lingo Ace平台是当前受到市场青睐的知名线上中文学习平台。对两个学习平台的建设、教学和管理营销三个方面的情况进行比较研究后发现:两个平台均通过线上直播课程面向海外青少儿教授中文,均建立了各自的官网和客户端,在品... Lingo Bus和Lingo Ace平台是当前受到市场青睐的知名线上中文学习平台。对两个学习平台的建设、教学和管理营销三个方面的情况进行比较研究后发现:两个平台均通过线上直播课程面向海外青少儿教授中文,均建立了各自的官网和客户端,在品牌定位、课程资源体系、选课方式和学习者服务模式等方面的设计上都有差异,针对教师选拔、培训的侧重点和严格程度也有不同的标准;两个平台均注重通过口碑、新闻软文和社交媒体等途径进行营销,但在推广方式和营销经费投入力度方面做法不同。线上中文学习平台应建设本土化和标准化教学资源,提升系统稳定性和智能化水平,完善教师管理机制,建立良好服务体系,组建本土团队,实施精准营销等发展策略。 展开更多
关键词 中文学习平台 Lingo bus Lingo Ace 数字中文教育
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Factors Influence Hanoians’ Choice of Non-Motorized Transport Mode to Access Bus Stations
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作者 Ngo Trung Phuong Masahiko Kikuchi +1 位作者 Aya Kojima Hisashi Kubota 《Journal of Transportation Technologies》 2024年第3期372-389,共18页
Hanoi’s rapid urbanization has led to a surge in private vehicle ownership, particularly motorcycles, amidst inadequate public transportation infrastructure. Despite government efforts, many still prefer motorized tr... Hanoi’s rapid urbanization has led to a surge in private vehicle ownership, particularly motorcycles, amidst inadequate public transportation infrastructure. Despite government efforts, many still prefer motorized transport, citing mobility and safety concerns, exacerbated by insufficient pedestrian infrastructure. This study examines the motivations behind this reliance on motorized vehicles, particularly motorcycles, in Hanoi. Findings reveal safety and convenience as primary factors driving motorized transport use, especially for accessing bus stations. Economic incentives could promote non-motorized travel and public transport adoption. Policy implications highlight the importance of addressing economic factors and improving access infrastructure to manage motorized vehicle reliance and foster sustainable urban mobility in Hanoi. 展开更多
关键词 Access Mode Choice Non-Motorized Vehicles Motorized Vehicles bus User Urban Transport Behavior
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Charging Ahead with E-Buses: Benefits, Costs, and Transition Roadmap
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作者 Aaron Yang Katherine Wan Angela Fanqi Jin 《Open Journal of Applied Sciences》 2024年第9期2717-2748,共32页
This paper reaches a recommendation for the 10-year e-bus transition roadmap for New York City. The lifecycle model of emission reduction demonstrates the ecological and financial impacts of a complete transition from... This paper reaches a recommendation for the 10-year e-bus transition roadmap for New York City. The lifecycle model of emission reduction demonstrates the ecological and financial impacts of a complete transition from the current diesel bus fleet to an all-electric bus fleet in New York City by 2033. This study focuses on the NOx pollution, which is the highest among all major cities by Environmental Protection Agency (EPA) and greenhouse gases (GHG) with annual emissions of over five million tons. Our model predicts that switching to an all-electric bus fleet will cut GHG emissions by over 390,000 tons and NOx emissions by over 1300 tons annually, in addition to other pollutants such as VOCs and PM 2.5. yielding an annual economic benefit of over 75.94 million USD. This aligns with the city mayor office’s initiative of achieving total carbon neutrality. We further model an optimized transition roadmap that balances ecological and long-term benefits against the costs of the transition, emphasizing feasibility and alignment with the natural replacement cycle of existing buses, ensuring a steady budgeting pattern to minimize interruptions and resistance. Finally, we advocate for collaboration between government agencies, public transportation authorities, and private sectors, including electric buses and charging facility manufacturers, which is essential for fostering innovation and reducing the costs associated with the transition to e-buses. 展开更多
关键词 City Electric bus Greenhouse Gas Emission Reduction Economic Analysis Optimization Model Total Cost of Ownership
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基于M-BUS总线通信的泵站智能巡检系统设计
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作者 朱星宇 《自动化应用》 2024年第16期276-278,共3页
针对目前采用的人工巡视方法存在受地域限制、数据采集速度慢的问题,设计了一种利用M-BUS总线通信技术的智能泵站巡视系统。本系统以STM32为核心,以M-BUS总线为通信接口,对泵站的工作状况进行远程智能化监测,并对其故障进行预警和预报... 针对目前采用的人工巡视方法存在受地域限制、数据采集速度慢的问题,设计了一种利用M-BUS总线通信技术的智能泵站巡视系统。本系统以STM32为核心,以M-BUS总线为通信接口,对泵站的工作状况进行远程智能化监测,并对其故障进行预警和预报。同时,基于智慧云平台,进行远距离通信,并通过WiFi无线通信模块将采集的信息上传到云服务器,从而达到对泵站进行远程信息化管理的目的。所设计系统可有效解决泵站运行中存在的问题,为泵站的安全、稳定运行提供了有效的保证。 展开更多
关键词 泵站 M-buS通信 智能巡检 状态预测 远程监控 智慧云平台
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NC/Bu-NENA基推进剂性能研究(Ⅱ):吸收工艺
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作者 袁志锋 胡松启 +5 位作者 韩进朝 潘清 赵昱 裴江峰 张军 赵凤起 《火炸药学报》 EI CAS CSCD 北大核心 2023年第2期172-178,I0010,共8页
为研究一种无硝化甘油(NG)、以硝化棉(NC)和丁基-硝氧乙基硝胺(Bu-NENA)为主体的NC/Bu-NENA基推进剂的吸收工艺,设计了NC/Bu-NENA基推进剂配方,在不同的吸收温度、搅拌时间和冷却温度等吸收工艺条件下制备了吸收药,采用相机拍摄的方法... 为研究一种无硝化甘油(NG)、以硝化棉(NC)和丁基-硝氧乙基硝胺(Bu-NENA)为主体的NC/Bu-NENA基推进剂的吸收工艺,设计了NC/Bu-NENA基推进剂配方,在不同的吸收温度、搅拌时间和冷却温度等吸收工艺条件下制备了吸收药,采用相机拍摄的方法研究吸收药的分散度以及推进剂样品中NC分子的塑化度。分析了吸收药的分散度和塑化度,探索了NC/Bu-NENA基推进剂最适宜的吸收工艺并分析了原因。结果表明,首先,吸收温度是吸收工艺中最重要的因素,决定了增塑剂Bu-NENA在NC分子中的扩散速度,吸收温度越高则Bu-NENA在NC分子中的扩散速度越快,塑化越好,但是温度越高,Bu-NENA蒸发更快,两者平衡来看,吸收温度以70℃为宜;其次,冷却温度是吸收工艺中次重要的因素,决定了Bu-NENA在水中的溶解度和吸收药的团聚程度,温度越低,Bu-NENA在水中的溶解度越低,吸收药的团聚程度越低,但在工程应用中不能无限制地降低温度,两者综合考虑,冷却温度以20~25℃为宜;最后,搅拌时间的意义是在该时间段内Bu-NENA完成对NC的增塑,增塑完成后延长搅拌时间对提高推进剂性能效果不明显,以40~60min为宜。 展开更多
关键词 物理化学 bu-NENA NC/bu-NENA基推进剂 吸收工艺 吸收温度 冷却温度
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NC/Bu-NENA基推进剂性能研究(Ⅲ): 安定性、力学性能及机械感度
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作者 袁志锋 胡松启 +6 位作者 韩进朝 赵昱 李普瑞 王月梅 裴江峰 谢五喜 赵凤起 《兵器装备工程学报》 CAS CSCD 北大核心 2023年第9期108-113,194,共7页
为了研究丁基-硝氧乙基硝胺(Bu-NENA)对NC基推进剂安定性、力学性能及机械感度的影响,通过吸收-压延的方法制备了推进剂样品,测试了Bu-NENA的酸碱度、PH值以及阿贝尔安定性,获得了推进剂的拉伸强度、延伸率、抗冲击强度、玻璃化温度、... 为了研究丁基-硝氧乙基硝胺(Bu-NENA)对NC基推进剂安定性、力学性能及机械感度的影响,通过吸收-压延的方法制备了推进剂样品,测试了Bu-NENA的酸碱度、PH值以及阿贝尔安定性,获得了推进剂的拉伸强度、延伸率、抗冲击强度、玻璃化温度、动态力学性能、撞击感度及摩擦感度,分析探讨了表征Bu-NENA安定性的方法,NC/Bu-NENA基推进剂的热安定性、力学性能和机械感度的变化及机理。结果表明:采用酸碱度和纯度表征Bu-NENA的安定性比阿贝尔试验更贴合实际,Bu-NENA替代NG后推进剂的热安定性更好,甲基紫变色时间达到95 min(120℃);替代后推进剂的拉伸强度下降,延伸率和抗冲击强度大幅度提高,其中-40℃低温延伸率提高74.73%;玻璃化温度前移11.2℃,可能对推进剂制备工艺产生正面的影响并提高推进剂制备过程中的安全性;机械感度明显下降,其原因可能是Bu-NENA的自身感度低和对NC的塑化效果更强。 展开更多
关键词 bu-NENA 推进剂 热安定性 力学性能 机械感度
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From Hai Yao, Yang Yao to Xi Yao: Sinification of Material Medical from the West 被引量:1
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作者 Patrick Chiu 《Chinese Medicine and Culture》 2023年第4期319-329,共11页
In ancient China, Daoist philosophers developed the concepts of qi(energy), Wu Xing(five elements), and yin(feminine, dark, negative) and yang(masculine, bright, positive) opposite forces between 200 and 600 BCE. Base... In ancient China, Daoist philosophers developed the concepts of qi(energy), Wu Xing(five elements), and yin(feminine, dark, negative) and yang(masculine, bright, positive) opposite forces between 200 and 600 BCE. Based on these philosophies, Zhen Jiu(acupuncture), Ben Cao(materia medica), and the practice of Qi Gong(energy optimization movements) evolved as the three interrelated therapeutic regimens of Chinese medicine(Note 1). Since the time of Zhang Qian, who discovered China's western regions in the 1st century BCE, Hai Yao(the exotic elements of materia medica from the maritime Silk Road countries), had been transmitted from the ancient land and maritime routes of the Silk Road to China in the past two millennia(Note 2). Since the late 17th century, the English East India Company, later called the British East India Company, introduced Yang Yao(opium) to the Manchu Qing Empire to balance a growing trade deficit for tea export from China to the British Empire. After the First Opium War ended in 1842, enterprising expatriate chemists and druggists in the treaty ports imported Xi Yao(modern medicines from the Western world) for sale to the merchant navy and the local market. From the second half of the 19th century onwards, both Hai Yao and Xi Yao have become a fully integrated part of modern China's armamentarium for the Chinese medicine and Western hospitals and retail pharmacy sectors. This paper articulates the journey of adoption of exotic elements of materia medica from the ancient land and sea routes of the Silk Road, including the western regions and the rest of the world in the past two millennia. Opium traders, ship surgeons, medical and pharmaceutical missionaries, enterprising traders, and policymakers together transformed Ben Cao into Xi Yao during the late Manchu Qing dynasty and the early Nationalist Era. 展开更多
关键词 Hai yao Materia Medica Opium Cures Xi yao Yang yao
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Petrogenesis of the Late Eocene to Early Oligocene Yao'an Shoshonitic Complex,Southeastern Tibet:Partial Melting of an Ancient Continental Lithospheric Mantle beneath the Yangtze Block 被引量:2
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作者 DONG Mengmeng YANG Tiannan +3 位作者 XUE Chuandong XIN Di LIANG Mingjuan YAN Qinggao 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2023年第6期1657-1670,共14页
Cenozoic potassic-ultrapotassic igneous rocks are widespread in the southeastern Tibetan Plateau.Their petrogenesis and magmatic processes remain subject to debate in spite of numerous publications.Almost all of the C... Cenozoic potassic-ultrapotassic igneous rocks are widespread in the southeastern Tibetan Plateau.Their petrogenesis and magmatic processes remain subject to debate in spite of numerous publications.Almost all of the Cenozoic extrusive and intrusive rocks in the Yao’an area,western Yunnan Province,SW China,are geochemically shoshonitic,collectively termed here the Yao’an Shoshonitic Complex(YSC).The YSC is located in the(south)easternmost part of the ENE-WSW-trending,~550 km-long and~250 km-wide Cenozoic magmatic zone;the latter separates the orthogonal and oblique collision belts of the India-Eurasia collision orogen.Previously published geochronological and thermochronological data revealed that the rocks of the YSC were emplaced over a short timespan of 34-32 Ma.This and our new data suggest that the primary magma of the YSC likely was formed by partial melting of ancient continental lithospheric mantle beneath the Yangtze Block.This part of the continental lithospheric mantle had likely not been modified by any oceanic subduction.Fractionation crystallization of an Mg-and Ca-bearing mineral and TiFe oxides during the magmatic evolution probably account for the variable lithologies of the YSC. 展开更多
关键词 Ancient continental lithospheric mantle Partial melting yao’an Shoshonitic Complex Late Eocene to early Oligocene SE Tibetan Plateau
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Book Review of A Rainbow in the Mountains:Dress of the Yao—A Guide to Traditional Yao Costumes and Ornaments
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作者 Chen Bing 《Contemporary Social Sciences》 2023年第1期144-155,共12页
A Rainbow in the Mountains:Dress of the Yao,an album of pictures and texts on Yao clothing,the most comprehensive and systematic record of the dazzling costumes of the Yao ethnic minority which has been inscribed on t... A Rainbow in the Mountains:Dress of the Yao,an album of pictures and texts on Yao clothing,the most comprehensive and systematic record of the dazzling costumes of the Yao ethnic minority which has been inscribed on the national intangible cultural heritage list of China since 2006,is of great academic value and practical significance to study the profound connotation of the Yao traditional culture.The various styles,colorful dress customs,and exquisite craftsmanship constitute the beautiful cultural landscape within the Yao ethnic minority,as well as the way to explore all the social aspects of the Yao ethnic minority.This book review aims to arouse the attention of all sectors of the community to the clothing of the Yao ethnic minority,which has met the greatest challenge of the collection and protection of the Yao costumes and ornaments.Thus it is expected to sort out and retain those precious records that have been drifting away via pictures and texts,which we have already started and will continue to do in accord with the national cultural development strategy. 展开更多
关键词 the yao ethnic minority costumes and ornaments intangible cultural heritage
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“要不然”类推论标记的来源及其关联功能的扩展
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作者 叶建军 《通化师范学院学报》 2024年第11期28-39,共12页
“要不然”类推论标记包括“不然”“要不然”“要不”,表示对上文某种情况作出否定性假设,然后推导出某个结论。推论标记“不然”始见于上古汉语,“要不然”和“要不”始见于近代汉语。从根本上说,“要不然”类推论标记来源于“(如果)... “要不然”类推论标记包括“不然”“要不然”“要不”,表示对上文某种情况作出否定性假设,然后推导出某个结论。推论标记“不然”始见于上古汉语,“要不然”和“要不”始见于近代汉语。从根本上说,“要不然”类推论标记来源于“(如果)不这样”义的否定性假设小句。“要不然”类推论标记的连词化并不伴随着语法化,其否定性假设小句的性质未变。不过“要不然”类推论标记连词化后进一步语法化了,关联功能得到扩展,可以表示选择,进而可以表示建议。“否定性假设小句→推论标记→选择标记→建议标记”是推论标记的形成和演变模式。 展开更多
关键词 “要不然”类 否定性假设小句 推论 选择 建议
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团队年轻化生产设计更加优化和现代化 访Burmester CEO Frank Weise
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作者 本刊记者(图/文) 《视听前线》 2023年第11期86-87,共2页
在8月的“香港高级视听展”会上,我们有幸见到Burmester CEO Frank Weise,并与他进行了愉快的交流。作为在疫情期间才上任的Weise先生,自信心很强,并就明星产品和新产品作了简单的介绍。
关键词 明星产品 CEO 年轻化 自信心 现代化 bu
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基于EtherCAT总线的空间结构点阵自动同步加载系统研发 被引量:1
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作者 郝际平 黄育琪 +6 位作者 孙晓岭 赵敏 薛强 樊春雷 李存良 卜延渭 刘鹏飞 《土木工程学报》 EI CSCD 北大核心 2024年第1期10-25,82,共17页
大型空间结构试验通常具有加载点数量多、覆盖面积广、加载工况较多的特点,传统的加载方法很难兼顾成本适宜、安全高效。该文提出了一种新型空间结构点阵自动同步加载系统,该加载系统采用水作为试验载荷,应用实时工业以太网EtherCAT总... 大型空间结构试验通常具有加载点数量多、覆盖面积广、加载工况较多的特点,传统的加载方法很难兼顾成本适宜、安全高效。该文提出了一种新型空间结构点阵自动同步加载系统,该加载系统采用水作为试验载荷,应用实时工业以太网EtherCAT总线技术,可实现任意比例下多点同步精确加载。加载系统的控制模块、数据采集模块和加载容器可根据试验需要在控制总线上无限挂载和自由分布,具有通用性强、自动化程度高、安全高效、加载耗材清洁廉价的特点。该文详细介绍了该加载系统的原理与组成,以及EtherCAT总线主从式结构下主站和从站的具体实现,并将其应用于马鞍形正交索网结构承载力试验,整个加载过程中荷载稳步匀速增长、数值稳定准确,验证了该加载系统的可行性和准确性。 展开更多
关键词 空间结构 加载装置 EtherCAT总线 控制验证
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基于Profibus-DP的中冷控制器的设计研究
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作者 王香梅 薛英龙 《南方农机》 2023年第15期144-148,168,共6页
【目的】中冷控制器涵盖多种科学技术,具有一定的开发难度。【方法】课题组基于Profibus-DP总线接口,结合现代电子/电气设计方法和EMC工程设计实务,采用电路的模块化方法,设计了四种中冷控制器模块方案,从电机伺服驱动、温度测量、编码... 【目的】中冷控制器涵盖多种科学技术,具有一定的开发难度。【方法】课题组基于Profibus-DP总线接口,结合现代电子/电气设计方法和EMC工程设计实务,采用电路的模块化方法,设计了四种中冷控制器模块方案,从电机伺服驱动、温度测量、编码器脉冲计数、Profibus-DP总线四个方面分析了中冷控制器接口设计及算法,提出了部分硬件设计原理图以及温度控制算法及编程,并进行了发动机转速分别为1400 rpm、1800 rpm和2000 rpm时的涡轮增压后空气温升、压降、扭矩降实验。【结果】在不同运转工况下,发动机温升速度均不相同,功率越大、负荷越高,则温升速率越快;随着温度升高,涡轮增压的空气压力反而下降;随着涡轮增压后空气的温升,发动机扭矩下降。【结论】通过比较,选用总线桥产品,可以优化电子器件布局、布板布线,大大缩短课题开发时间,提高总线应用的稳定性与可靠性,对于短时间内工业级产品的设计与制造具有很好的应用价值。 展开更多
关键词 中冷控制器 PROFIbuS总线 温度控制 接口电路 PID算法
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Shaping a New Level of Bus Service under a Novel Concept of Bus Interaction: A Meta-Review
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作者 Vu Van-Huy Masahiko Kikuchi Hisashi Kubota 《Journal of Transportation Technologies》 2023年第2期173-207,共35页
Public transport services, particularly bus services, play an important role in a sustainable transportation system. However, despite various efforts, bus ridership has decreased. The appearance of shared and on-deman... Public transport services, particularly bus services, play an important role in a sustainable transportation system. However, despite various efforts, bus ridership has decreased. The appearance of shared and on-demand vehicle services is one of the main reasons for this issue. In addition, bus tourism services have been successfully developed to meet the exigent needs of tourists. Therefore, a new level of daily bus service is necessary to adapt to the changing demands of customers. Bus interaction (BI) plays an important role in bus services. Nevertheless, the conventional concept of BI mainly refers to users, physical interaction, and safety, but it does not address non-users, non-physical interactions, service quality, and other aspects. This study aims to elaborate on a new concept of bus services. Based on this, we developed a theoretical framework for BI. A meta-analysis was then conducted to identify the achievements and untouched aspects. The results of this study provide three main contributions. First, an unprecedented novel concept of BI is defined, including 13 types of interactions. Second, a comprehensive theoretical framework of BI is established based on the relationships between eight sustainable bus system sub-aspects and 13 BI types. Third, based on the theoretical framework and findings of the reviewed studies, a common finding comprehensive framework of BI is completed, which is accompanied by 1) key findings of the 13 BI types, 2) conclusions of traffic conditions affecting BI research, 3) BI research gaps, and 4) 16 main suggestions for future BI research. 展开更多
关键词 bus Service bus Interaction Human Demand Sustainable bus System Traffic Condition
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新型混合式贯通牵引供电系统及其复合控制策略 被引量:2
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作者 王鑫 郭祺 +2 位作者 涂春鸣 肖凡 侯玉超 《中国电机工程学报》 EI CSCD 北大核心 2024年第3期981-991,I0011,共12页
电分相与负序等电能质量问题是制约电气化铁路向高速化、重载化发展的桎梏。贯通牵引供电系统为消弭上述问题提供了契机,但既有贯通方案依然存在所需器件数目多、改造成本高、可靠性差等弊端。为此,在充分利用既有牵引变压器基础上,该... 电分相与负序等电能质量问题是制约电气化铁路向高速化、重载化发展的桎梏。贯通牵引供电系统为消弭上述问题提供了契机,但既有贯通方案依然存在所需器件数目多、改造成本高、可靠性差等弊端。为此,在充分利用既有牵引变压器基础上,该文设计一种新型混合式贯通牵引供电装置。该装置通过共直流侧与功率均分手段有效抵消输入侧纹波功率,降低有源/无源器件数目与电容容量。同时,针对直流侧二次纹波与负荷功率冲击,提出一种输入端口复合控制策略,有效解决纹波传递与冲击波动问题。最后通过仿真与实验验证所提装置及其控制策略的可行性与可靠性。 展开更多
关键词 新型混合式 牵引供电装置 公共直流母线 复合控制
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基于1553B总线的大规模信息系统设计问题研究
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作者 冯帅 牛剑 +5 位作者 李经松 董暘暘 于丹 王磊 蔡彪 张锦江 《载人航天》 CSCD 北大核心 2024年第3期364-371,共8页
某大型航天器GNC系统应用1553B总线构建了其规模庞大的信息系统,在信息系统设计过程中产生了3个问题:超长总线下的稳定通信、应用层协议的设计、多条总线的管理等。对这3个问题开展研究,描述了3个问题的由来,给出了问题的解决方法,并验... 某大型航天器GNC系统应用1553B总线构建了其规模庞大的信息系统,在信息系统设计过程中产生了3个问题:超长总线下的稳定通信、应用层协议的设计、多条总线的管理等。对这3个问题开展研究,描述了3个问题的由来,给出了问题的解决方法,并验证了方法的实际效果。结果表明:总线中继的方法,有效解决了1553B总线在240 m长度下的稳定可靠通信问题;广播帧计数回传的应用层协议,节省了总线数据通讯开销、并提供了丰富的故障诊断信息;遍历寻优的总线管理策略,最大程度上发挥了多机多总线系统的容错能力。 展开更多
关键词 1553B总线 信息系统 总线中继器 应用层协议 总线管理 GNC
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