排序方式： 共有69条查询结果，搜索用时 140 毫秒
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随着便携式用电器具的普及和电动汽车的发展,开发廉价、高性能、安全性锂离子电池成为锂离子电池工业发展的中心。层状锰系锂离子电池正极材料正符合此背景需要。本文选取LiNi0.5Mn0.5O2为研究对象,对其制备方法、合成条件进行了研究,并对正极材料LiNi0.5Mn0.5O2采用多种方法进行表征。具体采用了电感耦合高频等离子体发射光谱、X射线衍射、循环伏安测试手段。 相似文献
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废旧电池液对鲫鱼血液和免疫的影响 总被引：1，自引：0，他引：1
将相同情况下相等数量的鲫鱼随机放养于4个不同浓度的废旧电池液中暴露25d后,通过观察其摆尾频数反映新陈代谢快慢.并从各试验组中随机抽取血液样本,观察染毒后鲫鱼红细胞、白细胞数目的变化,血红蛋白含量变化,以及脾脏体指数等病理学和毒理学变化.通过试验结果判断废旧电池液对鲫鱼的危害程度. 相似文献
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A performance test bench for power batteries in hybrid electric vehicles is built. According to vehicles’ real driving condition, the correlative charge and discharge experiments of power batteries are carried out in different environmental temperatures. A new algorithm about self-correction fuzzy neural network control is used to calculate the state of charge(SOC)of power batteries at 25 ℃, and the result is compared with that of Arbin test instrumentation. Theoretical analysis and experimental results suggest that the accuracy of SOC calculated by the algorithm of correction fuzzy neural network control under variable rate discharge for power batteries meets the requirements. 相似文献
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The accumulation of heavy metals (HMs) in soils is the most often cited potential risk of compost application. As the ecological effects of metals are related to mobile fractions rather than to total concentrations in the soil, we measured the total (aqua regia–extractable) HM concentrations, the readily available water‐soluble and the potentially bioavailable LiCl‐extractable fraction of soil HMs in a field experiment after 10 y with total applications of 95, 175, and 255 t ha–1 biowaste compost (fresh matter). Total soil concentrations of Cd, Cr, Cu, Ni, and Pb in the compost treatments were not significantly higher than in the unfertilized control. Total Zn concentrations increased in the treatment with the highest application rate, as expected from the calculation of the Zn load in the composts. In the mobile fractions, as measured in soil saturation extract and LiCl extract, Cd and Pb were not detectable. Concentrations of Cr, Ni, and Zn were in the range published for unpolluted soils in other studies and did not show any differences according to treatment. Easily exchangeable Cu (in LiCl extract) was increased with compost fertilization, most probably due to complexation with low‐molecular organic complexants. Except for Cd and Zn, the results of the mobile HM fractions in the soil were in good agreement with plant HM concentrations. In conclusion, fertilization with high‐quality biowaste compost at such rates and after 10 y of application gives no cause for concern with regard to both total HM concentrations and available HM fractions. 相似文献
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基于太阳能的植保无人机续航提升方案 总被引：2，自引：0，他引：2
在农业领域对无人机的任务需求中,续航问题无疑是目前植保无人机所面临的重要问题之一。由于电池生产技术的瓶颈,目前植保无人机的有效作业时间大都被限制在12 min左右难以突破。太阳作为一个取之不尽用之不竭的“无源”动力得到了特别的关注,因此设计了一种基于太阳能的植保无人机续航提升方案。在六旋翼无人机平台上对方案的可行性进行实验,结果表明,安装了太阳能续航模块后的无人机相比安装前,飞行续航时间平均提升了70 s。该方案基于多轴无人机飞行平台,在无人机工作时将太阳能转化为电能为锂电池续电,从而减少锂电池在飞行时的电量消耗,增加植保无人机的有效作业时间,在一定程度上缓解了当前植保无人机的续航问题,并能够向其他基于无人机平台的应用延伸。 相似文献
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采用蚯蚓毒性试验方法,以赤子爱胜蚓(Eisenia foetida)为试验蚓种,研究土壤中废电池对蚯蚓超氧化物岐化酶(SOD)和可溶性蛋白含量的影响。结果表明:随着污染时间的延长,蚯蚓体内组织的SOD活性先增大后降低,呈现出抛物线型暴露时间-胁迫效应的相关关系;在一定暴露时间内,随着废电池浓度的增加,SOD活性呈抛物线型剂量-效应相关关系;蚯蚓体内的可溶性蛋白含量随着废电池污染浓度的增加及污染时间的延长均呈现下降趋势。蚯蚓体内可溶性蛋白和SOD活性对废电池污染产生了不同的响应,蚯蚓体内的SOD对环境污染比较敏感。 相似文献
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OBJECTIVE: To assess the suitability of a human algorithm for calculation of continuous cardiac output from the arterial pulse waveform, in anaesthetized horses. STUDY DESIGN: Prospective clinical study. ANIMALS: Twenty-four clinical cases undergoing anaesthesia for various conditions. MATERIALS AND METHODS: Cardiac output (Qt), measured by lithium dilution (QtLiDCO), was compared with a preceding, calibrated Qt measured from the pulse waveform (QtPulse). These comparisons were repeated every 20-30 minutes. Positive inotropes or vasopressors were administered when clinically indicated. Cardiac indices from 30.7 to 114.9 mL kg(-1) minute(-1) were recorded. Unusually shaped QtLiDCO curves were rejected and the measurement was repeated immediately. RESULTS: Eighty-nine comparisons were made between QtLiDCO and QtPulse. The bias between the mean (+/-SD) of the two methods (QtLiDCO - QtPulse) was -0.07 L minute(-1)(+/-3.08) (0.24 +/- 6.48 mL kg(-1) minute(-1)). The limits of agreement were -12.72 and 13.2 mL kg(-1) minute(-1) (Bland & Altman 1986; Mantha et al. 2000). Linear regression analysis demonstrated a correlation coefficient (r2) of 0.89. Cardiac output in individual patients varied from 49.1 to 183% of the initial measurement at the time of calibration. Linear regression of log-transformed Qt variation for each method found a mean difference of 9% with limits of agreement of -4.1 to 22.1%. CONCLUSIONS AND CLINICAL RELEVANCE: This method of pulse contour analysis is a relatively noninvasive and reliable way of monitoring continuous Qt in the horse under anaesthesia. The ability to easily monitor Qt might decrease morbidity and mortality in the anaesthetized horse. 相似文献
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水杨酸对废电池胁迫下绿豆幼苗抗氧化酶活性及生理特性的影响 总被引：3，自引：0，他引：3
采用室内有培养土的纸杯培养方法,研究了不同浓度水杨酸(SA)处理对废电池胁迫下,绿豆幼苗抗氧化酶及生理特性的影响.结果表明,废电池胁迫下,超氧化物歧化酶(SOD)活性升高,过氧化物酶(POD)活性降低,光合色素、可溶性蛋白含量下降,脯氨酸和丙二醛(MDA)含量升高,电导率增大,膜稳定性降低.显示出一定的毒害效应;低浓度(≤100mg·L-1)的外源SA处理能够明显增强废电池胁迫下绿豆叶片SOD、POD活性,改善多项指标,但随着SA浓度升高,SOD和POD酶活性逐渐降低.说明低浓度SA能通过刺激抗氧化酶活性.减轻氧化胁迫,缓解废电池对绿豆幼苗的毒害作用,但高浓度SA(≥100mg·L-1)缓解作用降低. 相似文献