六朝“三月三日”文人雅作中的意象探析——以“流水”为例

六朝时期出现了大量以"三月三日"为背景的诗赋作品。它们传达出基本一致的写作倾向:或为应诏而作,或为惜时而发,抑或是表现悠游风雅的名士风度。但无论分属何种,文人都以"流水"为题,间接抒发了士人对政治清明的期盼,对生命意识的追寻,以及寄情山水的怡然自得情怀。     

面向企业需求的计算机专业人才3＋1培养模式与课程体系建设的探索与实践

以榆林学院计算机专业人才培养方案为例,探讨计算机专业人才培养模式的改革,面向企业需求的计算机专业课程体系建设,企业需求典型人才群的规格特征,形成3＋1的人才培养方案和＂按年级分段＂推进的课程体系统,实践表明,该培养方案可有效的提高学生适应企业需求的专业技术实践能力和就业能力。     

H~(14)CO_3~-─HCO_3~-对柑桔幼苗叶片含铁量及~(14)C放射性强度的影响

研究了介质中N14CO-HCO3浓度对三种柑桔幼苗叶片含铁量的影响以及叶片14C放射性强度与含铁量的关系。结果表明，叶片含铁量随介质H14COHCOO2浓度提高而降低，14C放射性强度随N14CO3—HCO3浓度提高而增加。叶片14C放射性强度与含铁量呈反相关。3种试材中，除酸橙叶片14C放射性强度例外，趋势基本一致。     

Invariance principles in probability for stable processes generated by a class of dependent sequences

We prove an invariance principle in probability for φ-mixing sequences of random variables taking values in a separable Banach space. The conditions on the dependence structure required for this approximation result are known to be necessary and sufficient for weak convergence of the partial-sum process to the appropriate limiting process.     

新试剂3,5—二溴—4—偶氮8—羟基喹啉苯基荧光酮光度法测定钨的研究

研究了在表面活性剂CTMAB存在下，试剂3，5－二溴－4－偶氮8－羟基喹啉苯基荧光酮与钨的显色反应，在0．6mol／LHCl介质中，钨与试剂形成1：2的红色三元胶束配合物，其最大吸收波长为538nm，表观摩尔吸光系数为1．38×105L·mol－1·cm-1，钨含量为0～10μg／25ml范围内符合比尔定律，拟定方法用于钢铁样品中微量钨的测定，结果满意．     

Robust weighted Cramér-von Mises Estimators of location,with minimax variance in ϵ-contamination neighbourhoods

We construct weighted Cramér-von Mises location estimators which are asymptotically normally distributed throughout an ?e-contamination neighbourhood of a given, strongly unimodal distribution function, and which minimize the maximum asymptotic variance in such neighbourhoods. Applications to the estimation of a normal or logistic mean are given.     

二水合三(1—苯基—3—甲基—4—苯甲酰基—5—吡唑啉酮)合镧的合成与结构

用1-苯基-3-甲基-4-苯甲酸基-5-吡唑啉酮(HPMBP)溶液与硝酸镧溶液合成了镧的PMBP络合物-La(PMBP)_3·2H_2O,用X-射线法测定了该络合物的晶体结构和分子结构,晶体属于单斜晶系,c面心格子,C2/c空间群,a=2.4744(5)nm,b=1.6325(7)nm,c=2.5871(4)nm,β=105.44(2)°,V=10.0731nm~3,Z=8,Dc=1.330g·cm~(-3),μ=9.25cm~(-1)。络合物中心离子La(Ⅲ)处于由8个氧原子所构成的四方反棱柱体中心。La-O平均健长为0.2492nm。     

掺杂E_u~(3+)的La_3WO_6Cl_3的合成及发光特性

本工作采用高温固相反应法合成掺杂E_u~(3+)离子的La_3WO_6Cl_3荧光体,测定其X-射线粉未衍射,红外光谱、拉曼光谱、激发光谱和发射光谱,探讨La_3WO_6Cl_3:E_u~(3+)荧光体的发光特性。     

Ethical problems in program evaluation: Advice for trapped evaluators

This paper argues that ethical problems in program evaluation are increased when conflicting or incompatible evaluation models are applied concurrently. Three models are illustrated: an Amelioration Model, generating better information for a program's own decision makers; an Accountability Model, focusing on public data disclosure and citizen participation in evaluation; and an Advocacy Model, in which the evaluation is designed to advance the program's interests in the competition for resources. Ethical problems inherent in each model, and arising from combining models are presented, along with case examples and discussion. The authors suggest several directions that program evaluators can consider to reduce their vulnerability to ethical problems.