基于平衡样本的校准估计研究--以规模以下工业企业测算为例

为解决规模以下工业企业调查中存在的样本代表性不足的问题,提出基于平衡样本的校准估计方法,并得出相应的估计量和估计量方差。该方法在抽样设计阶段采用了平衡抽样设计,在估计阶段采用了校准估计方法,较大限度地使用了辅助信息;通过数据分析得出基于平衡样本的校准估计方法要优于基于平衡抽样的HT估计方法。同时,为满足平衡变量间线性无关的假定,提出使用主成分分析、切片逆回归和切片平均方差估计三种方法对相关的平衡变量进行处理的思路。该方法对我国规模以下工业企业调查的完善具有理论与实践的双重意义,可适当的推广至我国政府统计的其他调查中。     

应用微量火焰原子吸收技术测定工业硅中铅

本实验联合应用高性能空心阴极灯，缝式石英管，高效雾化器乙炔－空气火焰原子吸收法，采用了节流脉冲进样测定工业硅中铅，使铅的灵敏度改善了３１倍，同时克服了Ｆｅ，Ａｌ等原子化过程中形成的氧化物吸收石英管壁对实验的影响，此法简便，快速。     

Electrochemical Impedance Spectroscopic Investigation in Detecting 2,4‐dinitrophenylhydrazine Using Catalytic Effect of Copper at Glassy Electrode

This paper reports on the use of electrochemical impedance spectroscopy (EIS) allied to copper (II) for the determination of 2,4‐dinitrophenylhydrazine (DNPH) at glassy carbon electrode (GCE). The experiment measurements were carried out in methanol at a potential of 0.3 V versus Ag/AgCl. The Nyquist plots were modeled with a Randle equivalent circuit, by identifying the charge transfer resistance as the relevant concentration dependent parameter. These measurements show that the impedance spectra of DNPH increased by the formation of non‐electroactive compound produced from specific interaction between DNPH and Cu (II), which will block the electron‐transfer process of the redox probe. Therefore, the proposed methodology offers a detection limit of 4.0×10^?8 mol L^?1. The proposed methodology was satisfactorily applied to determine DNPH in industrial water samples.     

大学生就业竞争力模型的建立与应用

通过定义三角模糊数的限位系数,得到由限位系数确定的模糊数排序新方法,并将其运用于层次分析排序,改进了层次分析法的理论及方法.最后,介绍了Fuzzy AHP在高校师范毕业生就业竞争力评价中的一个应用案例.     

基于解释结构模型的大学生就业能力因子分析——以工业工程专业为例

运用调查法从用人单位和应届大学毕业生两个视角提取20个就业能力因子,发现不同视角下,就业能力因子存在较大差异.构建大学生就业能力因子解释结构模型,结果显示,20个因子可分为4层,一些处于模型底层的因子没有得到大学生足够的重视,这也是导致应急式的大学生就业能力培养模式和用人单位招聘困境的根本原因.注重"循序渐进"的提高、强化"专业技术"和"个性心理"两个方面核心能力的培养、用人单位介入培养过程是提升大学生就业能力的有效途径.     

福建省能源效率影响因素灰色关联分析

利用2005-2014年样本数据,应用灰色关联分析法分析人均地区生产总值、工业增加值占地区生产总值比重、第三产业增加值占地区生产总值比重、工业能源消耗量、煤炭消耗量占一次能源消耗比重、燃料动力类价格指数及研发占地区生产总值比重对福建省能源效率的影响程度.从分析结果看,工业能源消耗量、工业增加值占地区生产总值比重及研发占地区生产总值比重对福建省能源效率的影响较大,而能源价格对福建省能源效率的拉动作用最小.这说明现阶段加强高耗能行业的结构调整、加大清洁能源技术的研发投入、完善能源价格机制,并充分发挥政府干预在节能减排中的作用是福建省提高能源效率的重要途径,也是贯彻落实节能减排政策的关键.     

基于灰色关联模型的新能源汽车产业竞争力评价研究

新能源汽车产业已经成为汽车产业未来发展方向;而提高产业竞争力,能够有效降低新能源汽车产业运营费用,增进企业效益.在相关文献研究的基础上,构建了6个一级指标和28个二级指标的新能源汽车产业竞争力评价体系;借鉴灰色关联评价模型对广东省、福建省和湖北省新能源汽车产业竞争力的相关数据展开了实证研究.研究结果表明,与福建省与湖北省的情况相比,广东省新能源汽车产业的支持力度出现了较大变化,政策的推动对产业竞争力的提升和市场的扩大起到了极大的促进作用.     

Thermal and Sintering Characterization of IGCC Slag

IGCC slag is a vitreous residual product from the new induction gasification combined cycle gasification thermal power plants. In order to characterize this waste as secondary new material for the production of new glasses and glass-ceramics as construction materials; this slag from the Puertollano, Ciudad Real, Spain power plants has been fully thermally investigated. After controlled heating this waste gives rise to hematite, anorthite, and cristobalite crystallized materials.This revised version was published online in November 2005 with corrections to the Cover Date.     

由工业硫酸钛液制备TiO2纳米微粉

本文首次报道了通过加入乙二醇单甲醚由工业硫酸钛液热水解制备ＴｉＯ２纳米微粉的工艺过程，并对其水解、煅烧条件进行了探讨。表征了ＴｉＯ２的晶型和颗粒度、分析了其纯度。结果表明，ＴｉＯ２为金红石型，颗粒大小为３５－４２ｎｍ，平均为３８ｎｍ，杂质含量小于０．１ｐｐｍ。     

Pulse polarographic determination of trace amounts of cobalt (II) by complex formation with calcon

Some aspects of the polarographic reduction of sodium 1-(2-hydroxy-1-naphthylazo)-2-naphthol-4-sulphonate (trivial name: calcon or Eriochrome Blue Black R), as observed when using differential pulse polarography (d.p.p.) and alternating current polarography (a.c.p.), are described, as well as the polarographic behaviour of this compound in the presence of some metal ions. The peak that appears in the d.p.-polarogram due to the reduction of the cobalt (II) complex is the basis of a method for the determination of very small trace amounts of cobalt(II). The proposed procedure is rather selective (Ni(II) interferes, Mn(II) does not) and has a limit of detection of 7 g 1^–1 (minimum amount which can be determined 0.6 g Co(II)).