水溶液中取代乙酸的取代基效应

本文应用量子化学理论、超分子方法和ＣＮＤＯ／２计算方法，结合回归分析研究水溶液中取代乙酸的取代基效应与分子的电子结构的关系。并分析在水溶液中取代基效应被削弱的原因。     

吡虫啉防治柑桔黑刺粉虱,蚜虫试验

本文报道了吡虫啉在柑桔上的应用结果。用１０％吡虫啉２５００－１００００倍液喷雾一次，对柑桔黑刺粉虱防效达９１．１－１００％，对桔蚜防效达８５．３－１００％，持效期３０天以上，明显优于水胺硫磷和氧乐果。     

甲基橙指示还原终点铈量法测定铁矿石中全铁含量

铁矿石经HCl-KF HCO4溶样后，用二氯化锡还原Fe^3 为Fe^2 ，以甲基橙做指示剂指示还原终点，肺铈量法测定铁矿石中全铁的含量。方法简便，快速，终点每锐，精密度好，准确度高。     

NOX removal in excess oxygen by plasma-enhanced selective catalytic reduction

In the off-gases of internal combustion engines running with oxygen excess, non-thermal plasmas (NTPs) have an oxidative potential, which results in an effective conversion of NO to NO₂. In combination with appropriate catalysts and ammonia (NH₃-SCR) or hydrocarbons (HC-SCR) as a reducing agent, this can be utilized to reduce nitric oxides (NO and NO₂) synergistically to molecular nitrogen.

The combination of SCR and cold plasma enhanced the overall reaction rate and allowed an effective removal of NO_X at low temperatures. Using NH₃ as a reducing agent, NO_X was converted to N₂ on zeolites or NH₃-SCR catalysts like V₂O₅–WO₃/TiO₂ at temperatures as low as 100–200 °C. Significant synergetic effects of plasma and catalyst treatment were observed both for NH₃ stored by ion exchange on the zeolite and for continuous NH₃ supply.

Certain modifications of Al₂O₃ and ZrO₂ have been found to be effective as catalysts in the plasma-assisted HC-SCR in oxygen excess. With an energy supply of about 30 eV/NO-molecule, 500 ppm NO was reduced by more than half at a temperature of 300 °C and a space velocity of 20 000 h⁻¹ at the catalyst. The synergistic combinations of NTP and both NH₃- and HC-SCR have been verified under real diesel engine exhaust conditions.     

拟薄水铝石结构的演化

以理学Ｄ／ｍａｘ－３ＢＸ射线衍射仪，ＴＧ－ＤＴＡ，ＩＲ－４４０红外光谱等方法，研究了拟薄水铝石结构的演化。     

PbTiO3超微粉的介电性质

对于平均粒径２０～２００ｎｍ的ＰｂＴｉＯ３超微粉，首次通过它们的压块研究了介电性质。在粒径为３５ｎｍ左右时介电常数旦现峰值。     

Evidence of the vital role of the pore network on various catalytic conversions of N2O over Fe-silicalite and Fe-SBA-15 with the same iron constitution

Fe-silicalite and Fe-SBA-15 with similar iron content have been characterized by N₂ adsorption, small angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), scanning electron microscopy (SEM), high-resolution transmission electron micrographs (HRTEM), UV–vis–DRS and EPR, and tested in direct N₂O decomposition, N₂O reduction by CO and N₂O-mediated propane oxidative dehydrogenation. Both catalysts contain almost exclusively isolated Fe³⁺ sites of similar concentration and structure, which are, however, stabilized in markedly different pore geometries (intersecting channels of ca. 0.55 nm diameter in Fe-silicalite versus parallel linear pores of ca. 7.5 nm diameter in Fe-SBA-15). This aspect is of vital importance in order to exclusively ascribe different catalytic performances to the environment where the iron species are stabilized. Fe-silicalite revealed to be much more active than Fe-SBA-15 in all reactions studied. This clearly illustrates that the confinement of the iron species in pores of suitable geometry (structure and size) is essential to originate their remarkable catalytic properties. The large pores in ordered mesoporous materials apparently do not generate the required intimate contact between potentially active Fe sites and reactant molecules.     

HSV-tk基因/GCV系统治疗肿瘤的旁观者效应与缝隙连接关系的研究

目的 探讨单纯疱疹病毒胸苷激酶（HSV－tk）基因／丙氧鸟苷（GCV）系统杀伤肿瘤细胞时旁观者效应与细胞间缝隙连接的关系。方法 用PA317细胞包装STK质粒（逆转录病毒载体介导的HSV-tk基因），形成假逆转录病毒颗粒，转染有缝隙连接的大鼠胶质瘤细胞C6和无缝隙连接的入宫颈癌细胞 Hela，制成 C6 tk+和 Helatk+细胞，将不同比例的C6和 C6 tk+、Hela和 Hela tk+细胞混合，每种比例8孔，培养 24h后 4孔加入含0．5μg/mlGCV的培养基，4孔作对照，6d后用MTT法测量细胞存活率。在两个培养皿中放入周围粘有33mm高滤纸的载玻片，分别接种 C6、C6 tk+细胞。细胞 80%汇合后将载玻片互换，并加入含0．5μg/ml GCV的培养基，6d后观察细胞形态。结果C6细胞组存在旁观者效应，Heal细胞组不存在旁观者效应。培养皿中tk+细胞大部分被杀死,tk-细胞无变化。结论HSV-tk基因/GCV系统杀伤肿瘤细胞时旁观者效应与细胞间缝隙连接有关。     

工艺参数对TiO2碳热还原合成Ti（C,N）粉末的影响

本文探讨了ＴｉＯ２碳热还原法合成Ｔｉ（Ｃ，Ｎ）粉末过程中合成温度，保温时间，Ｎ２气流量，Ｃ／Ｔｉ比值等工艺参数的变化对粉末性状的影响，实验表明，Ｎ比Ｃ更易于Ｔｉ结合，改变工艺对数可调整Ｔｉ（Ｃ１－ｘＮｘ）的ｘ值。在１４００～１７００℃间可获得ｘ值的０．６～０．８５的Ｔｉ（Ｃ１－ｘＮｘ）粉末。     

基于非晶薄带逆磁致伸缩特性的非接触扭矩传感器

新型扭矩传感器的开发一直是国内外众多专家学者研究的重点,提出了一种基于逆磁致伸缩效应的扭矩传感器,它利用粘贴在轴上的高磁致伸缩非晶态合金层代替轴本身作为应力敏感元件。此传感器可安装在旋转轴上,而固定的测量仪器采用磁性耦合技术,可避免滑动接触。实验论证了传感器的基本特性,结果表明传感器具有检测扭矩的能力。