结构参数变化下梯度结构混凝土的抗压性能

为了分析梯度结构混凝土的保护层厚度、界面取向性及施工工艺对其抗压强度、破坏形式的影响规律, 进行了多组梯度结构混凝土试件的抗压强度试验。试验结果表明: 梯度结构混凝土抗压强度随保护层厚度的增加而增大; 与串联形式的梯度结构试件相比, 并联形式的抗压强度较小, 且失效始发于界面处;在界面处插捣可提高抗压强度, 并改变其破坏形式, 然而插捣过多及插捣时间延滞时, 提高幅度会降低。最后基于试验数据拟合,建立了保护层厚度与抗压性能之间的表达式,并从机理上解释界面处适当插捣增强层间结合的有效性。     

过氧化氢催化氧化合成一乙酸甘油酯

冰乙酸和烯丙醇反应制得了乙酸烯丙酯,然后,用过氧化氢水溶液氧化合成了一乙酸甘油酯.讨论了反应原料配比、反应温度及时间等对一乙酸甘油酯收率的影响.研究结果表明,当原料配比为n（乙酸烯丙酯）∶n（过氧化氢）∶n（钨酸钠）1：2：0.04,在30℃的条件下,恒温反应8 h,产品收率可达66.0%.     

催化褪色光度法测定农产品中的痕量铜

研究了在硫酸介质中痕量铜(Ⅱ)催化过氧化氢氧化乙基紫褪色反应的最佳条件,建立了高灵敏度测定痕量铜的新方法.检出限为6.0×10-10g/mL,线性范围为0.05~3.0μg/(25 mL).使用的仪器设备简单,检测简便、快速.应用于农产品中痕量铜的测定,结果令人满意.     

世界氢能与氢经济的发展概况及不同认识

介绍了世界主要发达国家和地区的氢能与氢经济发展近况，讨论了关于氢经济发展与环境的关系、氢能的利用效率、使用安全性以及成本费用方面的不同看法，提出氢经济发展还存在诸多问题需要各方共同努力解决。     

电极添加剂Nafion乳液对离子膜燃料电池放电性能的影响

离子交换膜燃料电池作为一种理想的氢能发电装置，是目前氢能研究开发的热点。用实验方法研究了电极添加剂Ｎａｆｉｏｎ乳液对离子交换膜燃料电池电化学性能的影响。实验结果表明，在电极中加入适量的Ｎａｆｉｏｎ乳液可以显著地提高电极的电催化反应活性。当电极中Ｎａｆｉｏｎ乳液的含量为３％￣５％时，燃料电池的放电电压和电流密度者处于高峰值状态。实验结果还发现，用不同方法配制的Ｎａｆｉｏｎ乳液对燃料电池放电性能的影响     

三明治链型有机金属化合物的结构与化学键

关于三明治链型有机金属化合物中的〔Pd4(DPOT) 2 〕2 +、〔Pd4(DPOT) 2 (NC5H5) 2 〕2 +两个离子的成键问题 ,吸取了现代理论和方法的成就 ,对上述两个离子的成键情况进行了分析 ,结果非常令人满意 .     

Applying Study of Hydrogen Storage Alloy

Hydrogen is an important source of energy.The natural resouces of hydrogen is plenty and it gives us lots of heat, and it is dean. One of difficulties of developing hydrogen sources of energy is hydrogen storage. Hydrogen storage tank is either dangous or a little of capacity. Liquid hydrogen occupys small space. Liquefaction temperature of hydrogen is -253℃ and need better heat insulation protection, the volumn and weight of heat insulation layer are equal to hydrogen storage tank. Hydrogen storage utillizing hydrogen storage material is a very safety, economical and effective method. Hydrogen storage material is either a medium of sofid hydrogen storage or is negative pole active material of Ni-H battery,and is the one of key technoloy of fuel and Ni-H battery, it is an important material of new sources of energy too.Nanotechnology is introduced Mg-matrix hydrogen storage alloy and is achieved progress gteatly,but hydrogen storage alloy need be mode further improvment on applying investigation.     

碱金属及碱土金属元素性质的多元分析

通过对碱金属及碱土金属元素的键参数、拓扑指数与其物理化学性质的多元回归分析,得到了良好的结构与性质相关性.     

钢-半固态铜-石墨压力复合的优化

为了开发钢铜石墨高温自润滑复合板材的复合技术,对钢板与QT i3.5-3.5石墨半固态浆料的压力复合进行了研究。采用人工神经网络建立了钢板预热温度、模具预热温度、QT i3.5-3.5石墨半固态浆料固相率等复合参数与钢-QT i3.5-3.5石墨复合板界面剪切强度之间的关系,并且利用遗传算法进行了优化,得到了合理的复合工艺。结果表明:在钢板预热温度为618℃、模具预热温度为526℃、QT i3.5-3.5石墨半固态浆料固相率为46.2%的条件下进行压力复合,复合板最大界面剪切强度为128.3M Pa。     

Effects of hydrogen peroxide on in vitro infection of Cryptosporidium parvum

The effect of hydrogen peroxide (H2O2) on Cryptosporidium parvum infection and the protective function of free radical scavengers were studied in cultured bovine fallopian tubes epithelial cells. H2O2 treatment at 500 μmol/L and 1 mmol/L significantly inhibited excystation of bleach-treated oocysts (p ＜ 0. O1 ). At 48 h postinoculation,H2O2 at 500 and 750 μmol/L resulted in a significant (p ＜ 0.01) decrease of C. parvum infection by 35.77% and 58.16% respectively in the cultured cells, when compared with the untreated control. Surprisingly, the infection was significantly increased from 22.21% to 39.33 % ( p ＜ 0.05) with lower concentration of H2 O2 (50 ～ 200 μmol/L). The inhibitory and stimulatory effects of H2O2 treatment on C. parvum infection were, to a certain extent, abolished in the presence of reduced glutathione or mannitol. These observations indicate that reactive oxygen species, such as H2O2, may play an important role in C. parvum infection.