白腐真菌J610-D分泌漆酶处理几种有毒环境污染物的研究

就白腐真菌漆酶对环境中几种常见的有毒污染物的降解效果进行了研究.结果表明:白腐真菌漆酶能够很好地催化氧化芳胺类及其衍牛物,当控制苯胺浓度<800 mg/L、邻苯二胺浓度<150 mg/L时,白腐真菌漆酶对苯胺、邻苯二胺的降解率均可达90%、100%;白腐真菌漆酶对硝基苯类化合物的降解效果不明显,当控制其浓度<150mg/L,对硝基苯化合物的降解率可达80%.     

Numerical simulation of ionization enhancement in the topside ionosphere of cusp foot-point region caused by low energy particle precipitation

The Graz Ionospheric Flux Tube Simulations (GIFTS) has been improved. The improved GIFTS model was used to numerically investigate the energy particle precipitation on the distribution of electron density in the ionospheric cusp foot-point region under conditions of large plasma convection during magnetic storm. After including the effects of low energy incident particles, the ionospheric electron densities increase remarkably above altitude of ∼250 km, showing a peak at about 350 km. The percent enhancements of electron densities increase gradually with altitude, exceeding 60% near the upper boundary of the calculation. The calculated ionospheric F ₂-peak was remarkably enhanced and lifted up by the incident low energy electrons. Biography: CAI Hongtao(1976–), male, Associate professor, Ph.D., research direction: polar magnetosphere and ionosphere.     

TiO2对共沉淀法制备Pd/Al2O3-TiO2催化活性的影响

文中采用共沉淀法制备了混合载体质量分数为1%的Pd/Al₂O₃-TiO₂催化剂，借助XRD和XPS对样品进行了表征，结果表明：混合载体Al₂O₃-TiO₂为无定形结构；TiO₂降低了Pd和Al₂O₃的相互作用能力。将样品应用于C₃H₆选择催化还原NO反应，以NO转化率为活性评价指标对催化剂的活性进行了对比，发现TiO₂的含量对催化剂活性有显著影响：随着TiO₂质量分数从0增加至50%，催化剂活性迅速增加；TiO₂质量分数超过50%，催化剂活性增加趋势变缓。     

切分方式对鲜切紫甘蓝营养品质和挥发性风味物质的影响

为研究不同切分方式对鲜切紫甘蓝品质的影响,采用横切及纵切两种方式切分紫甘蓝,比较贮藏前后鲜切紫甘蓝的表观颜色、褐变率、可溶性固形物、酚类物质和花色苷含量及风味品质。结果表明,贮藏9d后,鲜切紫甘蓝的L*值和a*值降低,b*值增加,褐变率增加,可溶性固形物减少0.27~0.33Brix,总酚和总花色苷质量分数分别增加2.69~2.78mg/g和0.06~0.11mg/g;纵切可有效减缓样品褐变,保持儿茶素、绿原酸、咖啡酸、阿魏酸和奎宁酸等酚类物质含量。电子鼻与挥发性物质分析表明,贮藏9d后紫甘蓝中的氮氧化合物增加,横切较纵切样品异硫氰酸烯丙酯等含量增加,导致不良风味的产生。研究结果表明,纵向切分可减缓切面褐变,较好地保持紫甘蓝的酚类成分及风味品质。     

Optical properties of cobalt xanthate films on different substrates

Cobalt isopropyl xanthate thin films (CXTFs) were deposited via chemical bath deposition onto different substrates: commercial glass (CG), indium tin oxide (ITO), and poly(methyl methacrylate) (PMM). Isopropyl xanthate was synthesized according to a method described in the literature. The cobalt nitrate and isopropyl xanthate were mixed in a beaker, which allowed the thin films to be deposited via a simple ion-ion mechanism. The transmission, reflectivity, refractive index, dielectric constant, and optical conductivity were investigated for various thin films coated onto different substrates. An ultraviolet-visible spectrophotometer was used to measure the optical properties of the thin films. The lowest value of the transmission and the highest value of the refractive index were observed for the thin films deposited onto PMM. The structure of the cobalt xanthate was characterized by Fourier transform infrared (FTIR) spectroscopy, which was measured using a Perkin-Elmer Spectrum 400 spectrometer. The stretching vibration of the Co-S bonds was observed at 359 cm-1 in the FTIR spectrum of the CXTFs.     

2013年初夏河南一次区域性暴雨天气过程的分析

利用常规资料和NCEP再分析资料,对2013年5月25—26日河南省区域性暴雨过程的环流形势、水汽条件和垂直螺旋度进行了分析,结果发现:西南涡沿切变线移出是暴雨形成的诱因,中低层低涡与涡前持续的低空急流为暴雨的产生提供有利的大尺度天气背景条件.700 hPa水汽通量变化对强降水落区有一定的指示作用,暴雨区一般位于水汽通量大值中心附近和前端等值线梯度密集带内;水汽通量辐合增强增厚降水增强.强降水多位于垂直螺旋度正大值中心附近和长轴两侧.     

薄板坯连铸连轧流程试制含钒钛取向硅钢中氮化物析出相

通过热力学计算与模拟试验研究了含钒钛取向硅钢中氮化物析出相的析出规律与析出行为,并探讨了含钒钛元素的氮化物析出相作为薄板坯连铸连轧流程制备取向硅钢中辅助抑制剂的可行性.研究表明,在所冶炼的含钒钛取向硅钢的成分范围内,Ti N在钢液凝固末期便具备析出的热力学条件,而Al N与VN只可能在凝固后的α+γ或α+Fe3C两相区内析出.含钒钛取向硅钢中氮化物析出相以成分复杂的复合析出相为主,且随着钒钛加入量的增加,钢中抑制剂析出相总的分布密度由于含钒钛元素的氮化物析出相的增加而明显提高,使抑制剂抑制初次再结晶晶粒正常长大的能力得以加强,最终成品的磁感应强度值B8由1.857 T提升至1.898 T.同时,加入不高于0.007%的Ti与不高于0.005%的V不会影响中间脱碳退火工序的脱碳效果以及高温退火净化阶段硫、氮的脱除效果,其形成的含钒钛元素的纳米级氮化物析出相适合作为薄板坯连铸连轧流程制备取向硅钢的辅助抑制剂.     

简单铁盐催化的Suzuki-Miyaura偶联反应研究

开发一种廉价、无毒的过渡金属用于催化Suzuki-Miyaura偶联反应具有重要的现实意义。本文选取简单的铁盐作为研究对象,考察了不同铁盐、碱以及溶剂对催化Suzuki-Miyaura偶联反应的影响。结果表明:在乙醇溶液中,K2CO3作为碱,5 mol%FeCl2·4H2O在80°C下能够有效催化各种溴代芳烃及碘代芳烃与芳基硼酸的Suzuki-Miyaura偶联反应,产率在33%~99%之间。     

含D-乙酰氨基葡萄糖和哌嗪的脲类化合物的合成及表征

以D-氨基葡萄糖盐酸盐为起始原料,经过羟基的乙酰化保护,得到2-氨基-1,3,4,6-四-O-乙酰基-2-脱氧-β-D-吡喃糖盐酸盐;然后在三乙胺存在下,与三光气、哌嗪衍生物"一锅法"反应,合成4种具有代表性的糖基哌嗪物质.产物结构均经FT-IR,1 H NMR和HRMS(ESI)确认.     

氯化钠作为造孔剂制备含氯多孔羟基磷灰石实验研究

采用化学沉淀法,制备纳米HA粉体.采用造孔剂法,首次利用Na Cl作造孔剂,将纳米HA粉体和Na Cl颗粒按一定比例混合压制成型,经高温烧结制备出多孔含Na Cl的HA材料.利用XRD、SEM、EDX手段研究多孔HA的组成成分、微观形貌、孔径尺寸及孔隙率.研究结果表明:Na Cl是比较理想的造孔剂材料,可制备孔隙率、孔径尺寸、形貌可控的多孔材料.造孔剂含量为30%,尺寸在160~200目时,造孔效果最好;在烧结温度1200℃烧结时,Na Cl会与HA发生反应,生成Ca5(PO4)3Cl,Ca9.54P5.98O23.58Cl1.6(OH)2.74等新的物相.