盐胁迫下稀土浸种对薏苡幼苗膜脂过氧化作用影响的研究

研究了薏苡种子用２００、４００ｐｐｍ稀土溶液浸种后，其幼苗在ＮａＣｌ胁迫下体内ＳＯＤ活性、膜脂过氧化作用、膜系统伤害三者之间的关系。结果表明：经２００ｐｐｍ稀土溶液浸种后，幼苗在ＮａＣｌ胁迫下，能够维持较高ＳＯＤ活性，降低膜脂过氧化作用和细胞膜透性。说明经合适的稀土溶液浸种，能够提高薏苡幼苗的耐盐性。     

高性能磁性液体材料研究进展

解决纳米磁性粒子的耐氧化问题对制备高性能磁性液体具有重要意义。系统介绍了金属磁性液体和氮化铁磁性液体的制备方法，并对各种制备方法进行了评述。综述了磁性液体的耐氧化研究进展，主要是纳米金属粒子的无机物包覆和氮化铁磁性液体的抗氧化剂添加；展望了高性能磁性液体在耐氧化方面的研究趋势。     

碳纳米管及C60和石墨氧化动力学机理函数的分析

The oxidation of carbon nanotubes, C60 and graphite was studied by thermogravimetric (TG) analysis and differential thermal analysis (DTA) technique, and the oxidation kinetic models of three carbon materials studied were analyzed by mechanism-function method. The results indicate that three carbon species adopt different oxidation mechanisms due to their different structures. The oxidation of carbon nanotubes with cylindrical structure follows contracting volume reaction mechanism [R3 mechanism, 1-(1-α)1/3 = kt], indicating that the oxidation of carbon nanotubes takes place from the ends to the center. For graphite with planar sandwich structure, the oxidation starts at the edges initially and gradually moves toward the center, which corresponds to contracting area phase boundary reaction mechanism [R2 mechanism, 1-(1-α)1/2 = kt]. The oxidation of C60 with spherical structure, however, is complex and apparently cannot be illustrated with a single kinetic model. The values of apparent activation energy     

优良水消毒剂——ClO2的性质表现

二氧化氯是优良的水消毒剂,是氧化型消毒剂。二氧化氯对水中的一些还原态的金属阳离子、低价硫化物、氰化物、有机物等均有氧化作用。ClO2对无机物氧化以祛毒为主,对有机物的氧化降解以含氧基团的小分子化合物为主,即最终以无毒害作用的产物为主。     

聚丙烯单丝用抗老化剂浅述

简述了聚丙烯的老化机制,着重介绍了在光氧作用下的老化及添加抗老化剂的措施,分别从添加紫外线吸收剂、氢过氧化物分解剂、激发态猝灭剂和自由基捕获剂、光屏蔽剂六种助剂出发,研究其作用机制、性能优势并综述当前的研究进展。研究了在水和金属离子以及力的作用等不同环境因素影响下聚丙烯的老化过程,最后简要介绍了目前的复合抗老化剂。     

环氧SEBS胶黏剂的制备及性能研究

通过苯乙烯-乙烯-丁二烯-苯乙烯共聚物(SEBS)的环氧化反应制备出两性的SEBS,然后用适当的溶剂混合C9石油树脂和古马隆树脂制成胶黏剂,研究了SEBS、增黏树脂、过氧化氢等对胶黏剂剪切强度和剥离强度的影响,并用红外光谱、TG、SEM等对胶黏剂的结构和性能进行了分析。结果表明:环氧SEBS胶黏剂的剪切强度和剥离强度大幅提高,热分解温度有所下降;当过氧化氢用量为8 g时,环氧指数和180°剥离强度同时达到最大值。     

木耳并非越黑越好

木耳被誉为"素中之王",含有丰富的碳水化合物、蛋白质、铁、钙、维生素等营养物质,营养价值极高。同时它富含的植物胶原成分,具有很强的吸附作用,对难以消化的谷壳、沙子等异物具有溶解和氧化作用。因此,常吃黑木耳能起到清理消化道、清胃涤肠的作用。但一些不法商贩经常使用墨汁将普通地耳染黑冒充黑木耳,因此专家提醒消费者,黑木耳并非越黑越好,消费者应通过辨色、闻味等方法仔细鉴别。真正的黑木耳正面是黑褐色,背面是灰白色的,而地耳是     

仲钨酸铵对Ag-Sn合金粉末的氧化作用

本文采用氧化增重法（TGA），研究了添加少量仲钨酸铵（APT）对Ag-Sn合金粉末的氧化作用，用X射线衍射仪，电子探针和金相分析了粉末氧化前后相的转变、氧化物的分布、形貌。结果表明，Ag-Sn APT混合粉末的氧化规律服从Wagner理论；APT的分解产物及形成的新相Ag2WO4作为活性氧原子源，促进Sn的氧化，添加剂APT在0－2．26wt%成分范围内和相同温度、相同氧化时间条件下，氧化速率随添加量增加而加快，随氧化温度的提高，氧化速率加大，如在800摄氏度下的氧化速率大于700摄氏度下的氧化速率。     

Change of Electrochemical Property of Reinforced Concrete after Electrochemical Chloride Extraction

The half cell potential （HCP） and corrosion current of reinforced concrete specimens doped with sodium chloride were determined after electrochemical chloride extraction （ECE）. The experimental results show that when ECE treatment is removed, HCP becomes more negative and corrosion current becomes larger in comparison to those before ECE treatment, then HCP shifts positively and corrosion current decreases with time. After 30 days ECE treatment, the HCP of cored specimens turn to about -100 mV due to the existence of sufficient oxygen around the exposed steel bars, but for un-cored specimens, longer time, about two months, is to be taken. The non-homogeneous HCP distribution at different layers of the same specimen after ECE treatment might induce secondary corrosion of steels.