Blood glutathione peroxidase and selenium in abortion

This study was carried out to estimate the levels of glutathione peroxidase and selenium in blood of abortion cases. Glutathione peroxidase and selenium were determined in 52 abortion cases (22 in 1^st trimester, 30 in second trimester), 45 normal pregnant cases and 25 nonpregnant control cases. The selenium concentration in whole blood and plasma in abortion cases was almost the same as in normal pregnant women but significantly low when compared with the control non-pregnant group. The glutathione levels was higher in abortion cases when compared with normal pregnant and non-pregnant control groups. Red cell and plasma glutathione peroxidase activities of women who had abortion were significantly lower compared with both non-pregnant control group and normal pregnancies.     

废旧电池的环境危害及回收处理

随着科技的发展和进步,电池越来越广泛地应用于工农业生产、军事目的以及日常生活中;与此同时,产生的废旧电池不计其数,给环境、生态系统以及人体健康造成了巨大威胁。本文论述了废旧电池对环境以及人体健康产生的种种危害。借鉴国外废旧电池回收处理经验以及电池的改造技术,对我国废旧电池回收处理提出了通过源头控制、宣传教育、意识提高、完善法规、科学管理以及加强回收处理技术的研究开发等方面的建议。     

电动车用蓄电池的选取及充电方法的研究

本文对电动车电池及充电方法的选取作了较详细的介绍,介绍了常规充电方法和快速充电方法的种类、适用范围及最新研究成果;重点分析了电动车用蓄电池的工作特点、充放电原理、选取原则、最新的充电技术及发展情况;尤其对近年来出现的快速充电技术进行了详细介绍,并对三阶段充电法作了详细的分析和探讨。实践证明三阶段充电法对电动车用铅酸蓄电池充电,具有能更好地遵循充电电流接受率曲线,减少充电出气量,克服蓄电池充电充不满的毛病,还能大大延长蓄电池的使用寿命。减少环境污染等诸多特点,具有重要的理论和实践价值。     

废电池的环境污染及防治

随着我国经济的高速发展和生活水平的迅速提高,各种类型电池的使用量和废弃量急剧增加。废电池是一种既具有一定资源化价值,又对生态环境和人体健康具有潜在威胁的、复杂的复合固体废物,其环境无害化管理和资源回收问题是国内外广泛关注的一个热点问题。但是,废电池种类很多,其对生态环境和人体健康的危害。以及再生利用的价值和可能性具有明显差别,     

Cyclic-anion salt for high-voltage stable potassium-metal batteries

Electrolyte anions are critical for achieving high-voltage stable potassium-metal batteries (PMBs). However, the common anions cannot simultaneously prevent the formation of ‘dead K’ and the corrosion of Al current collector, resulting in poor cycling stability. Here, we demonstrate cyclic anion of hexafluoropropane-1,3-disulfonimide-based electrolytes that can mitigate the ‘dead K’ and remarkably enhance the high-voltage stability of PMBs. Particularly, even using low salt concentration (0.8 M) and additive-free carbonate-based electrolytes, the PMBs with a high-voltage polyanion cathode (4.4 V) also exhibit excellent cycling stability of 200 cycles with a good capacity retention of 83%. This noticeable electrochemical performance is due to the highly efficient passivation ability of the cyclic anions on both anode and cathode surfaces. This cyclic-anion-based electrolyte design strategy is also suitable for lithium and sodium-metal battery technologies.     

Progress of all vanadium redox flow batteries

Aresearch team headed by Prof. ZHANG Huamin from the CAS Dalian Institute of Chemical Physics has made important progress in the research and development of a LED screen demo system powered by vanadium redox flow batteries （VRB）. The system has operated continuously for over one year without any malfunction. So far, the total running time is up to 11,000 hours.     

The promises,challenges and pathways to room-temperature sodium-sulfur batteries

Room-temperature sodium-sulfur batteries (RT-Na-S batteries) are attractive for large-scale energy storage applications owing to their high storage capacity as well as the rich abundance and low cost of the materials. Unfortunately, their practical application is hampered by severe challenges, such as low conductivity of sulfur and its reduced products, volume expansion, polysulfide shuttling effect and Na dendrite formation, which can lead to rapid capacity fading. The review discusses the Na-S-energy-storage chemistry, highlighting its promise, key challenges and potential strategies for large-scale energy storage systems. Specifically, we review the electrochemical principles and the current technical challenges of RT-Na-S batteries, and discuss the strategies to address these obstacles. In particular, we give a comprehensive review of recent progresses in cathodes, anodes, electrolytes, separators and cell configurations, and provide a forward-looking perspective on strategies toward robust high-energy-density RT-Na-S batteries.