基于职业取向的化学教学设计——以“硫酸的工业生产”为例

基于人教版必修新教材中新增“化学与职业”栏目进行了“硫酸的工业生产”教学设计与实践。学生角色扮演“化工工程师”为解决工业上是如何制备硫酸这一核心研究话题,经过理论分析硫酸生产路径、模拟体会具体反应用于生产实际时所需考虑的问题、实际调研化工厂中的硫酸生产工艺这3个环节,增强对化学相关职业的认识与了解,发展以化学为职业取向的兴趣。     

Determining the structure of tetragonal Y2WO6 and the site occupation of Eu dopant

The compound Y₂WO₆ is prepared by solid state reaction at 750 °C using sodium chloride as mineralizer. Its structure is solved by ab-initio methods from X-ray powder diffraction data. This low temperature phase of yttrium tungstate crystallizes in tetragonal space group P4/nmm (No. 129), Z=2, a=5.2596(2) Å, c=8.4158(4) Å. The tungsten atoms in the structure adopt an unusual [WO₆] distorted cubes coordination, connecting [YO₆] distorted cubes with oxygen vacancies at the O₂ layers while other yttrium ions Y₂ form [YO₈] cube coordination. Y³⁺ ions occupy two crystallographic sites of 2c (C_4v symmetry) and 2a (D_2d symmetry) in the Y₂WO₆ host lattice. With Eu³⁺ ions doped, the high resolution emission spectrum of Y₂WO₆:Eu³⁺ suggests that Eu³⁺ partly substituted for Y³⁺ in these two sites. The result of the Rietveld structure refinement shows that the Eu³⁺ dopants preferentially enter the 2a site. The uniform cube coordination environment of Eu³⁺ ions with the identical eight Eu-O bond lengths is proposed to be responsible for the intense excitation of long wavelength ultraviolet at 466-535 nm.     

基于职业岗位导向的发酵工程课程改革与实践

发酵工程是高职生物技术等工科类专业一门非常重要的专业核心课程,根据学生就业岗位的职业资格标准和岗位要求,教师从教学内容、教学方法及考核方式几个方面进行尝试和探索,以期学生学习本门课程后,在取得“发酵高级工”国家职业资格证书的同时,被用人单位录用后可快速适应相关职业岗位工作。     

生态文明背景下职业经理人选择的实证研究--以常州民营企业为例

生态文明建设如火如荼,正全面融入经济建设、政治建设、文化建设和社会建设的方方面面。在此背景下,民营企业在选择职业经理人的过程中也体现出了新的特点。在对生态文明建设的含义、背景进行介绍的基础上,对现代职业经理人进行了分类,指出不同类型岗位对职业经理人的生态意识和能力要求不同;并从生态文明意识、职业道德和品质、职业资质、能力、心理和个性等方面总结和归纳出民营企业选择职业经理人的基本条件和评价要素;最后在问卷调查的基础上进行实证检验,并根据其重要度进行了排序和论证,为民营企业增加选择成功率提供参考建议。     

高职“思想道德修养与法律基础”课融入职业观教育的思考

在高校思想政治理论课程新方案实施的背景下,论述在高职“思想道德修养与法律基础”课教学中融入职业观教育的必要性、内容和实现途径,旨在进一步加强和改进大学生的职业观教育,提高高职《思想道德修养与法律基础》课教学实效。     

企业服务与市场占有率关系研究

文章运用多元线性回归统计的方法和手段,选择钢铁企业作样本,建立了企业服务与市场占有率的关系的数学模型,并进行了相关性分析,从而得出服务内容中什么因素对市场占有率的影响较大,什么因素对市场占有率影响较小的结论。     

利用GIS技术进行耕地占补平衡工作的探讨

介绍了GIS技术,针对我国目前耕地占补平衡工作的技术上的不足.提出了利用GIS进行耕地占补平衡工作的技术方案,结合山西省的实际情况,对耕地等级数据库的建立、耕地占补平衡系统的开发进行了较为详细的阐述.     

Relation between the Slater–Kohn–Sham orbitals generated by the one-body potential V(r) of DFT and the Löwdin natural orbitals for inhomogeneous electron liquids

The Löwdin natural orbitals (NO) are defined as those orbitals which bring the first-order density matrix of a correlated electron assembly into diagonal form. Another one-particle density matrix with the same diagonal elements is the single-particle idempotent Dirac density matrix generated by the one-body potential of density functional theory. Here, we compare the off diagonal form of γ expanded in terms of the Slater–Kohn–Sham (SKS) orbitals generated by V(r) with the NO expansion of Löwdin for general inhomogeneous electron liquids. In particular, the equation of motion of the correlated γ is corrected from that of γ _s , both now containing the one-body potential V(r). To illustrate the theory presented here, we first construct an approximate, albeit accurate, correlated 1DM for the ground state of the He atom and display connections between the resulting NOs and the SKS orbitals. The second example we discuss, but now quite briefly, is that of the inhomogeneous electron liquid in crystalline Si, where the NO expansion is available from the literature.     

新疆和田透闪石软玉的振动光谱

采用X荧光光谱、X光粉晶衍射、红外光谱和拉曼光谱等对新疆和田地区的白色、青色和黑色透闪石软玉进行了化学成份和振动光谱研究。在通过X光粉晶衍射判定所采样品全部属于透闪石质软玉后,采用红外光谱仪和拉曼光谱仪对样品进行振动光谱测试,并结合化学成分测试结果分析白玉、青玉和墨玉等不同颜色的软玉中透闪石晶体结构M1、M3位置中阳离子占位情况。红外光谱中M—OH吸收谱带显示样品在M1及M3位置不仅有Mg2+和Fe2+,还有Fe3+。M—OH的吸收谱带和振动光谱特征与化学成分测试结果一致。在此基础之上,总结了新疆和田透闪石软玉中阳离子的种类和含量对振动光谱的影响。     

ON THE WEIGHTED OCCUPATION TIME AND SUPPORT OF SUPER-BROWNIAN MOTION CONDITIONED ON NON-EXTINCTION

1991MRSubjectClassification60G57,60J601IntroductionInrecentyears,theconditionedsuperprocessbecomesanimportanttopicintheresearchfieldifsuperprocesstheory.Inthispaperswestudyaclassofspecialconditionedsuperprocess,i.e.thesuper-Brownianmotionconditionedonnon-extinction.Weintroducesorxlenotatiollsfirstly.LetM(R')bethecollectionofallfinitemeasllresonRd.LetCo(R') ,CO(R') ,C'(R') bethecollectionsofcontinuousfunctiollshavingcOInpactsupports,vanishingatinfinity,havingfirst-ordercontinuousderivat…