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1.
随着电动汽车技术的发展和应用,对于电动汽车充电技术的要求不断提高,对于充电时间短、充电效率高以及对电网负担小的充电模式的研究成为电动汽车充电技术的发展趋势,其中快速充电模式已经成为电动汽车充电技术研究与发展的主要模式。本文从快速充电技术的发展与影响,介绍了快速充电模式中的脉冲充电法、恒流恒压充电法以及综合快速充电法,分析了快速充电模式对电网的影响以及目前的解决方案,对于电动汽车快速充电的发展趋势做了总结。  相似文献   

2.
针对目前不同领域对于铅酸蓄电池充电电源技术的要求,本文具体介绍了包括恒压充电法、恒流充电法以及分段式充电法在内的3种铅酸蓄电池充电方法,并重点分析了各种充电方法的充电控制原理。本文从铅酸蓄电池的Thevenin模型出发,基于Boost电路来建立仿真模型,利用比例积分调节来实现动态控制,并在Matlab中对上述3种方法进行了仿真,确定了各种充电方法的优点和缺点。仿真结果表明,不同的充电方法结合其自身的特点有着不同的应用领域和范围。  相似文献   

3.
缺少软件控制系统的康复训练设备难以被用户操作,在Android平台上为下肢训练轮椅设计一套人机交互软件系统,旨在帮助用户通过使用该系统简单有效地控制轮椅设备,提高患者训练效果。利用Android集成开发工具ADT在Android智能设备上设计完整的图形用户界面系统,并使用该系统与下肢训练轮椅进行语音控制实验。结果表明,该人机交互系统能够实时控制轮椅的运动状态。  相似文献   

4.
随着电动汽车和充电设施的长足发展,电动汽车充电慢的问题日趋严峻,大功率充电技术的需求日益明确,但充电电缆重量随电流增加而剧增,给用户带来不便。现有自动充电机器人的充电电流较小,无法兼容大功率液冷充电枪的大电流需求。为此,该文设计了基于关节球轴承与直线轴承的混合结构、平行式电动缸与柔性软轴互补方式的6自由度机械结构,利用ADAMS动力学软件模拟机械本体,仿真分析了电动推缸、充电枪夹头等主要部位的受力情况,验证了大功率全自动充电辅助装置设计的合理性,为样机试制奠定了坚实的理论与技术基础,打破了因大电流充电电缆韧性差与质量重而导致单枪自动插拔动作难实现的限制,助力充电服务体系的智能化与便捷化发展。  相似文献   

5.
本设计是一款面向高龄者和肢体残疾者的创新产品.它是通过链传动、蜗轮蜗杆传动等组成的转向机构实现轮椅的全方向无回转半径转向运动,其中,利用蜗轮蜗杆传动的自锁性解决驱动机构对转向控制机构的影响,提高轮椅转向运动的稳定性;其驱动机构由控制机构、中央驱动机构和周边万向轮机构组成,周边万向轮支撑腿设计成弹簧式杠杆机构,起到运动平衡补偿作用.这几个机构共同组成了轮椅主体,可以使轮椅在狭小的空间内自由运动,结构简单、控制灵活、成本低、效果好,为高龄者和肢体残疾者的生活提供便利.  相似文献   

6.
设计了以ATM89C51单片机为核心的太阳能路灯照明系统.系统采用节能、环保的大功率白光LD作为灯源,利用UC3909芯片对胶体铅酸蓄电池进行智能充电,结合混合储能技术以提高储能效率,延长蓄电池的使用寿命;利用升降压电路实现弱光充电功能,同时采用最大功率跟踪技术,使太阳能电池的利用效率明显提高.对系统的运行情况的检测结果验证了其可行性与稳定性,对同类产品的研发具有很好的参考价值.  相似文献   

7.
多功能轮椅     
为了体现对残疾人的关爱,给他们的出行和生活带来方便,我发明了这种“多功能轮椅”,他们一定会喜欢的。这种多功能轮椅的主要特点是:1.给轮椅设计一个活动雨篷,不管天晴下雨、下雪都可以外出;2.轮椅底座下面设计了可以放生活用品的储物箱,  相似文献   

8.
正也许我们都曾经遭遇过这样的尴尬,当你拿起手机准备接打电话时,手机却没电了。现在,你大可不必为此烦恼,因为在科技高速发展的今天,一些让人瞠目结舌的另类手机充电方式已经应运而生。用尿液充电英国布里斯托尔机器人研究所的科学家已开发出一种用"尿液充电"的技术,且以此技术造出了世界上第一部用微生物燃料电池供电的手机。原来这种"尿液电池"是一种微生物燃料电池,它利用活的微生物的  相似文献   

9.
文章主要研究了电动汽车无线充电的分类及磁共振式无线充电的工作原理,设计了单线圈双边LCC型补偿电路的无线充电系统,并利用MATLAB软件中的SIMULINK仿真平台进行了系统部分性能的仿真分析,重点研究了耦合线圈的电磁耦合系数和负载阻值对无线充电系统电能传输功率和传输效率的影响。分析结果发现,单线圈双边LCC型无线充电系统能够满足大部分中、小型电动汽车日常无线充电的需求。  相似文献   

10.
盛莉 《教育技术导刊》2008,7(6):145-147
论述利用PWM脉宽调制产生可用软件控制的充电电源,以适应不同阶段的充电电流的要求。温度传感器对电池温度进行监测,并通过AD转换和相关计算检测电池充电电压和电流,以判断电池到达哪个阶段,以此达到智能充电的目的。  相似文献   

11.
B Mader  L A Hart  B Bergin 《Child development》1989,60(6):1529-1534
While service dogs are known to perform important tasks for people using wheelchairs, such as retrieving dropped items or pulling a wheelchair, they may also serve as an antidote for social ostracism. Adults in wheelchairs have been found to receive many more social acknowledgements when a service dog is present than when not. This study examined whether disabled children in wheelchairs with service dogs receive more frequent social acknowledgment than when no dog is present. Behaviors of passersby in response to children in wheelchairs were recorded in shopping malls and on school playgrounds. In both settings, social acknowledegments (e.g., friendly glances, smiles, and conversations) were substantially more frequent when a service dog was present. Social effects of the dog were more pronounced in shopping malls, typical of unfamiliar settings where the child would be likely to experience being ignored or overlooked. Service dogs may assist in normalizing the social interactions for children with disabilities producing social isolation.  相似文献   

12.
13.
Within the so‐called normal society one can observe again and again symptoms of reluctance to being closely associated with people with physical disabilities. The general opinion is that this group of people is characterised by specific psychological and physical functioning and they are thought to have distinct needs and expectations as regards family life. To verify and confirm the above, comparative research was undertaken to find out how young able‐bodied, blind and persons using wheelchairs evaluate marriage. The subject of the research was the importance ascribed to the hierarchy of values related to marriage and family, and the types of needs satisfied through these institutions of social life. The participants were asked to evaluate such phenomena as love, sexual life and parenthood as well as expressing their attitude and opinion on conjugal infidelity. The results obtained do not indicate any significant differences in attitudes and views presented between the groups under consideration. All valued marriage and family life very highly and had similar expectations, however, not all will be able to fulfil their needs and aspirations in these areas. It will be quite complicated, especially so for those who are disabled. All possible failures are caused by, first of all, negative attitudes of the society towards erotic activities of people with disabilities.  相似文献   

14.
This comparative study explores the attitudes of children towards deaf children, children in wheelchairs and blind children in Greece and in the UK. A total of 463 children participated in this study, with 229 children from Greece and 234 children from the UK, in the fifth and sixth grades in primary schools. The views of the children were elicited with the use of an attitude scale. The roles of prior contact and current contact were examined. Results indicated that all children were positive towards the three categories of children and that girls were more positive than boys. Comparative findings showed that children's attitudes in the two countries differed in several ways. Children in Greece were more positive than children in the UK. However, children attending schools with special education units in Greece held more negative attitudes than children attending schools with special education units in the UK. Also, children in Greece who had prior contact with deaf children were less favourable towards deaf children compared with children in the UK. Furthermore, the results indicated that children held positive attitudes at a superficial level, expressing mostly social and emotional concern, and not a willingness to interact with these children. The findings stimulate a discussion regarding the impact of sociocultural characteristics upon children's attitudes towards children with special educational needs.  相似文献   

15.
论建立求能欲概念和创新欲概念的必要性   总被引:1,自引:0,他引:1  
对才能、智慧和新事物的需要和渴求是客观存在的。求能欲(益智兴趣)和创新欲(创造兴趣)在心理系统中已有准确的定位。求知欲、求能欲、创新欲之间是层次递进的相交关系。创新是时代的课题,创新能力可以培养也有必要培养。创造教育方兴未艾,培养创新欲的工作应贯穿教育的全过程。“求知欲”这个词不能直观、准确地反映求能欲和创新欲的客观现实,仅利用求知欲概念不便于指导和促进“激发求能欲和创新欲的工作”。故建立求能欲概念和创新欲概念很有必要。  相似文献   

16.
司马迁写《史记》不是适应西汉统治者"一统天下"的需要而为其做哲学和历史的解释。中国古代帝王"一统天下"后,没有必要也没有用著通史的形式做哲学和历史的解释;汉武帝也没有就"一统天下"提出解释的要求;司马迁父子写《史记》并不为"一统天下"做解释,其动因一是为天地良心所迫,为后世留传史料,二是为展示个人才华,立身扬名,为先祖争光。  相似文献   

17.
苏霍姆林斯基的创造教育思想   总被引:6,自引:0,他引:6  
苏霍姆林斯基认为,学校进行创造教育的主要任务是培养多方面的天赋和才能,培养学生的创造品质。创造教育的基本内容有:创造意识教育、创造毅力教育、创造力培养、教会学生学习和世界观教育。上思维课、进行创造性劳动的、提供丰富多彩的精神生活以及发现和培养创造性教师,这是实施创造教育的主要途径和方法。  相似文献   

18.
会计诚信是我国市场经济健康运行的基本保障,是会计行业发展的奠基石,是会计从业人员的安身立命之本。建立和完善会计诚信教育机制、会计诚信法律机制、会计诚信激励制约机制、会计诚信的评价机制和会计诚信的内控机制等在内的会计诚信促进机制,是当前我国会计诚信建设的有效手段。  相似文献   

19.
思想政治教育是真善美对立统一的过程。思想政治教育需要增强思想政治教育的艺术性,从而不断推进思想政治教育的创新,更加充分地发挥其功能。为此,需要着眼全局,抓住关键要素,营造和谐的氛围,增强思想政治教育的融合性;架起心灵的桥梁,增强思想政治教育的互动性;引发理性的思考,增强思想政治教育的说服性;召唤情感的力量,增强思想政治教育的渗透性;发挥人格的魅力,增强思想政治教育的引导性;加强文化建设,增强思想政治教育的实效性。  相似文献   

20.
在山西临汾建立了大豆、油葵、玉米和休闲4个茬口。对不同茬口下的8个不同专用小麦品种的产量及个体和群体发育的影响进行了研究。结果表明:产量性状适宜大豆茬口的品种1个,玉米茬口2个,油葵茬口3个,休闲茬口2个。8个品种在各茬口的平均产量以玉米茬最高5985.0kg/hm^2,大豆茬最低5602.5kg/hm^2。个体生长冬前表现较好的为油葵茬,拔节期表现较好的为玉米茬。不同茬口对同一品种的群体消长动态影响不同,不同品种间的群体消长动态存在差异。  相似文献   

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