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《农业装备与车辆工程》2021,(3)
为了解决充电桩共享困难以及电动汽车充电数据的信息孤岛,基于区块链技术建立了一套可以兼顾充电桩以及充电数据的共享策略。通过智能合约生成充电数据的MD5码,以数字摘要的形式录入区块链,保证了共享过程中交易的去中心化、安全性与用户隐私,为多方提供了一个良好的共识信任机制。针对充电桩共享平台,设计了一套完整的前端操作逻辑和操作页面,为区块链技术在充电桩共享领域的实际落地提供了一种具有尝试价值的思路。 相似文献
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基于物联管理平台的自动检测认证系统就是为提升充电桩接入车联网平台的速度、推进充电桩建设、提高充电桩利用率的基础性平台系统,该系统对充电桩接入车联网平台前的注册能力、接入后的充电能力、充电过程中的数据上送能力、出现故障时的故障上报能力等进行相关检测标准的制定,以及针对这几种能力的检测,通过后能够自动生成检测认证报告。通过自动检测认证系统的检测,车联网平台能够保障接入充电桩的正常使用,减少用户使用过程中出现故障,提高平台用户的留存率,同时也减轻了充电桩企业出厂前对设备的检测工作,节约了充电桩企业的检测成本。 相似文献
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随着政策的支持和规模化电动汽车接入电网,用电安全越来越受到关注,包括车、桩、网和人的安全。在这个环节中,充电桩作为电力传输的介质,安全风险犹为须要重视。针对充换电设备本地和其平台的研究,通过冗余保护、功率调配单元和智慧运营平台的联动机制,实现电动汽车充换电安全风险多层级智能防控。首先,充换电设备结合现有国标,优化设备选型和功能设计,降低安全风险;其次,鉴于变压器扩容不便、但同时满足多车辆同时充电的现状,采用增设功率调配单元监控充电需求与剩余电力容量,达到需求与能力有效平衡;最后,为共享分支箱和延用原有塑壳断路器及其电力线缆,保证设备的最大化使用的同时,采用智慧运营平台进行精准防范和控制。 相似文献
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本文主要根据电动汽车的充电方式以及原理,针对电动汽车的充电桩进行了研究,介绍了交流式充电桩以及直流式充电桩的各自控制组成、工作原理以及优缺点,阐述了电动汽车未来的发展趋势。 相似文献
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<正>2019年元旦前,经供电人员精心调试,四川省宜宾港"港口岸电"智能充电系统一次性成功送电投运,标志着国家电网在四川境内安装的首套"港口岸电"智能充电系统正式上线。"万里长江第一港"宜宾港"港口岸电"智能充电工程系统投资69万元,共为码头4个泊位安装了8个充电桩,总容量为320 kW,能极大满足进出、停靠港口船舶用电需求,实现电能替代,掀开了 相似文献
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《Journal of Agricultural Engineering Research》1998,69(3):249-254
A model to represent the discolouration of dried powder of carrots as a function of temperature was developed. Two types of carrots, Asian and European, containing large amount of lycopene and β-carotene, respectively, were tested. The dried powder was stored under an atmosphere with O2and at three different temperatures, 5,20 and 35°C. The surface colour of the powder was monitored during storage by a Hunter colour ratioa/b. In the proposed model, the rate of oxidation was assumed to be represented by the product of the fraction of concentration of oxidized pigment at arbitrary time and a specific rate of oxidation of pigment. The rate parameters in the proposed model were calculated by fitting the experimental data with smooth curves by trial and error at the end of the induction period but before discolouration took place. The frequency constant and activation energy, expressing the temperature dependence of the rate parameters, were expressed by the Arrhenius relation. The simulation results of a Hunter colour ratioa/bof dried powder at 25°C showed good agreement with the experimental data, suggesting that the proposed model was effective for the prediction of discolouration of dried powder of both types of carrot. The use of the induction period in the manner described may enable the shelf life of dried powder to be predicted. 相似文献
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感官检验棉花的品级,这是农村常见的一种检测手段.它的一个主要特点就是存在不确定性.这是由于检验员的品级检验水平存在一定的差异,其中有很多因素制约着检验的结果.文章对影响感官检验结果的因素进行了系统的分析. 相似文献
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The fractional outflow rate of water from the rumen, measured as the rate of disappearance of the chromium complex of ethylenediamine tetra-acetic acid, was related to a number of dietary factors. A multiple regression equation was derived which expressed fractional outflow rate as a function of the intakes of dry matter, ash, acid-detergent fibre and crude protein.The data analysed consisted of 243 observations for sheep on 59 diets, including forage, concentrate and mixed diets. The ranges covered by the data were: fractional outflow rate 0.7–3.6 day?1; dry matter intake 560–1400g/day; ash 4–30%, acid-detergent fibre 7–41%, crude protein 5–26 % of dry matter; there were no observations for sheep of less than 34 kg liveweight.The equation accounted for 56·3 % of the total variance. Between-sheep variance could not be calculated for the whole of the data but was undoubtedly substantial since, for a sixth of the data, it was known to account for 38 % of the total variance. 相似文献
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从灾害经济学的角度探讨了城镇供水优化调度的必要性和可能性,认为在缺水不可避免的情况下,对供水进行优化调度可以减小缺水带来的损失,产生较好的减灾效益,特别是可以大大减小严重干旱的灾害效应。并根据水资源的特性,提出了缺水损失的计算模式以及优化调度的原则和方法。 相似文献