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新能源汽车概论课程的开设不仅能让学生对新能源汽车有一个清晰的概念,而且能帮助学生理解新能源汽车的发展现状、趋势以及推广的现实意义,是社会发展的现实需要。我国大力发展新能源汽车,不仅能有效推动国家经济的进一步发展,而且大幅度缓解了国家所面临的能源压力,代表了我国现有的经济与科技实力。新能源汽车概论课程的开设是为了让学生在掌握基本的新能源汽车知识的基础上理清汽车行业的发展方向与需求。文章主要分析了新能源汽车概论课程的重要性与存在的问题,探究其实践方向。 相似文献
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汽车工业的不断发展,给环境带来了沉重的负担,而新能源技术的发展,让人们看到了环保型社会的前景。本文详细分析了新能源汽车技术的发展现状,探讨了当前新能源汽车技术遇到的两大问题,并展望了新能源汽车技术未来的发展方向。 相似文献
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基于全球能源短缺与环境污染的现状,新能源汽车必将成为未来汽车的发展方向,我国已将新能源汽车列入国家战略性新兴产业。本文从可持续发展的角度出发,详细阐述了新能源汽车在我国发展的必要性,分析了目前我国新能源汽车产业的发展现状及不足之处,并对新能源汽车产业发展的有效路径提出了合理的建议。 相似文献
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随着我国汽车工业的长足发展,随之而来的石油等能源短缺和二氧化碳污染的问题越来越突出,汽车工业面临着前所未有的挑战,亟需革命性的变革。全球能源和环境面临的巨大挑战使得全球新能源汽车的发展和应用已经形成共识,以电动、混合动力以及燃料电池等技术支持的新能源汽车为代表的汽车改革是我国新能源汽车的发展方向。为进一步探究新能源技术在汽车工业中的应用价值,本文从新能源汽车产业的现状、新能源技术的应用现状及新能源技术的发展前景等多个角度进行分析和探讨,为汽车产业变革提供可参考的依据。 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