高职学生信息技术能力特点调查分析

通过问卷方式对高职学生信息技术能力进行调查,统计数据,从信息获取、评价、处理、交流能力以及信息道德方面对高职学生信息技术能力特点进行分析。     

超高效液相色谱串联质谱法测定烟草中的噁霉灵残留

为降低烟草中噁霉灵检测中的基质干扰，提高检测灵敏度和和稳定性，通过试验建立了以QuEChERS为样品前处理方法、液相色谱串联质谱仪为检测仪器的烟草中噁霉灵残留检测方法。样品加水浸润后，经丙酮提取、盐析试剂包除水、石墨化炭黑除杂后，采用Agilent ZORBAX 300SB-C8液相色谱柱（2.1 mm×100 mm，1.8 μm）分离，甲醇-水程序洗脱，ESI雾化，串联质谱MRM检测。结果发现，该方法在0.0025~0.0500 mg/L范围内线性良好，决定系数r²=0.9996，定量检测限1.06 μg/L，回收率在90.8%~92.0%之间，相对标准偏差为5.1%。运用该方法测定烟草中的噁霉灵，操作简单，检测精度高，满足CORESTA对烟草农残检测的要求。     

Effects of Cooling Rate and Component on the Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

The microstructure and mechanical properties of Mg–6Zn–1Y and Mg–6Zn–3Y(wt%) alloys under different cooling rates were investigated. The results show that the second dendrite arm spacing(SDAS) of Mg–6Zn–1Y and Mg–6Zn–3Y is reduced by 32 and 30% with increasing cooling rates(Rc) from 10.2 to 23 K/s, which can be predicted using a empirical model of SDAS=68 R 0:45:45cand SDAS=73 R 0c, respectively. The compressive strength of both alloys increases with increasing the cooling rate, which is attributed to the increase of volume fraction(Vf) of secondary phases under high cooling rate. The interaction of the cooling rate and component with SDAS has been theoretically analyzed using interdependence theory.     

Zinc doped Fe2O3 for boosting Electrocatalytic Nitrogen Fixation to ammonia under mild conditions

Artificial nitrogen fixation is emerging as a promising approach for synthesis of ammonia at mild conditions. Inspired by biological nitrogen fixation based on bacteria containing iron, zinc doped Fe₂O₃ nanoparticles are proposed as an efficient and earth abundant electrocatalyst for converting N₂ to NH₃. In neutral media, it achieves a maximum Faradaic efficiency (FE) of 10.4% and a large NH₃ yield rate of 15.1 μg h^?1 mg^?1_cat. at ?0.5 V vs. reversible hydrogen electrode. This catalyst also exhibits excellent selectivity and stability. Theoretical calculations suggest the reaction follows the associative enzymatic mechanism and it has a barrier of as low as 0.68 eV.     

稠油微生物开采技术现状及进展

综述了用微生物方法开采稠油的技术现状与进展，论题如下。①概述。②基本方法：异源微生物采油，包括微生物吞吐和微生物驱；本源微生物采油压大港孔店油田的实例。③主要机理，包括产表面活性剂，降解稠油中重质组分及其他。④技术研究，包括机理性、可行性及经济效益研究，列举了国内外6个实例。⑤现场应用，包括国外1个、国内6个实例。⑥该技术的优势及问题。参22。     

试论绩效考核反馈--面谈

从剖析绩效考核反馈案例入手，分析和论述了绩效反馈面谈的目的、任务、内容、原则和技巧，指明了面谈是绩效考核反馈的黄金途径，提出了面谈的具体做法和要求。为企业人力资源管理者掌握绩效考核面谈及开展此项面谈工作提供一些参考和借鉴。     

HEDP作为润滑油抗磨剂的应用研究

考察了1-羟基乙叉-1，1-二膦酸（二辛）酯（HEDP）的极压抗磨性能以及与硫化异丁烯的复合效应，并用俄歇电子能谱（AES）分析了其四球机试验后钢球表面的元素。结果表明，HEDP作为抗磨剂用于极压性润滑油中，具有优良的极压抗磨性能，其与硫化异丁烯复配也显示出了良好的协同效应。HEDP对于油品的防锈性能具有积极的作用，对有色金属的腐蚀无不良影响，具有多效功能，对于研制低剂量的极压性油品配方具有重要意义。HEDP应用于重负荷车辆齿轮油的全配方中，所调制的复合剂添加量不大于4．5％的GL-5车辆齿轮油符合GB1389592质量标准。