取代三联吡啶光度法测定铬(Ⅵ)

研究了 6 ,6″—二甲基— 4′—苯基 - 2 ,2′ :6′ ,2″—三联吡啶 (TPY)与Cr(Ⅵ )的显色反应。在pH5 .0 6 .2的HAc -NaAc介质中 ,Cr(Ⅵ )与该试剂形成稳定的橙色络合物 ,其吸收峰波长λmax=36 7nm ,表观摩尔吸光系数为 1.72× 10 5L(mol·cm) -1,Cr(Ⅵ )浓度在 1.3～ 76 μg/L内服从比尔定律。精密度和准确度实验结果表明 ,该方法准确 ,可用于环境水及电镀水中铬 (Ⅵ )的测定     

江泽民论“三农”问题的多维视角及价值取向

江泽民从理论和实践、历史和现实的多维视角,对“三农”问题进行了深刻的阐述．江泽民关于“三农”问题的重要论述,鲜明地体现了“三个代表”重要思想的本质要求,集中体现了以人为本的价值取向,为推进我国社会主义新农村建设提供了理论指导。     

替吉奥与卡培他滨联合奥沙利铂治疗晚期胃癌效果对比分析

目的分析比较替吉奥联合奥沙利铂与卡培他滨联合奥沙利铂治疗术后复发转移性胃癌的效果。方法 2010年5月至2011年5月收治26例术后复发转移晚期胃癌患者,观察组12例予奥沙利铂30mg/m2,第1天,静脉滴注;替吉奥按体表面积选择40mg~60mg/次,2次/日,口服,第1~14天。对照组予奥沙利铂30mg/m2,第1天,静脉滴注;卡培他滨1500mg/次,2次/日,口服,第1~14天。以上均为21天为1周期,每2周期评价疗效,并随访病情进展。结果 26例病例均可评价;观察组和对照组的近期有效率(RR)分别为50%和42·8%,两组比较差异无显著性,但治疗组的不良反应及严重反应发生率均明显低于对照组。结论替吉奥治疗术后复发转移性胃癌的疗效较好,不良反应轻,值得临床进一步研究。     

关于辛亥革命史研究的几个问题

“辛亥革命”是一历史的概念 ,现有的辛亥革命的话语主要源于革命党人关于革命的历史记忆与历史叙述 ,同时又受到了现代中国革命话语的影响。从一个较长的历史时段来看 ,1911年的辛亥革命是晚清最后十几年间 ,特别是甲午战争以后维新运动、社会化趋势与民族主义建国思潮相激荡的产物 ,这三种因素的相互作用又影响了辛亥革命的结局。因此 ,研究辛亥革命 ,必须考察辛亥革命话语的形成 ,同时注重研究辛亥革命年间维新与革命、文化与社会之间的互动关系以及民国初年的国民心理     

汉英新闻翻译中的词汇迁移及分析

新闻翻译是对外宣传的主要途径之一，准确而有效地翻译不仅涉及信息的有效传达，而且事关我们的国际形象。本文结合新闻英译中的一些实例，从语言迁移的角度分析新闻英译过程中一些词汇翻译的不当之处进行剖析，以探讨如何实现准确、有效的翻译。     

Comparing several experimental groups with a control in the multivariate case

This paper presents a multivariate extension of Dunnett's test for comparing simultaneously k treatment group means with a single control group mean. A test based on Hotelling T²statistics is presented and approximate critical values are evaluated for the case of equal numbers of observations in each group, for the .05 and .01 levels of significance, for 1 to 5 variates, for 1 to 10 treatment groups, and for varying degrees of freedom. The accuracy of the procedure for generating approximate critical values is assessed via simulation studies conducted for selected cases and an example is presented using real data.     

略论元诗“宗唐得古”说的理论可能——以语义学分析为线索

“宗唐得古”是元诗的基本特征之一,但这种后来的归纳与认定却被过度引申.客观史料和语义学的分析证明:元诗“宗唐得古”说的理论引申必须得到限制,它只能在“陈述”与“总结”的基础上被理解;元诗的理论口号与实践间存在巨大差异,由口号上的“宗唐”得出元诗“反宋”的引申并不能成立;元代诗风的建立在很大程度上也是一个官方“雅正”诗风建立的过程,元人自身的陈述既剖明又遮蔽了历史.     

中国黄金市场的风险价值研究

受美国次贷危机以及中国股市低进的影响，对于中国的投资者而言，黄金作为硬通货自然就成为一种很好的实现财富保值增值的投资工具。本文以基于广义误差分布的EGARCH（1，1）模型估计了中国黄金市场的日对数回报VaR值，通过后验测试与统计分析，得出以下结论：EGARCH（1，1）模型（1）能较好地拟合黄金价格的走势（2）杜宾-沃特森（D．W）统计量为1．994103极为接近2，这意味着回报序列的自相关很弱，因此均值方程可以不考虑自回归项。     

Trade-off between quoted lead time and price

In a make-to-order environment, lead time and price can play a crucial role in determining the financial success of a firm. Their importance increases when demand is sensitive to the quoted lead time and price. A model is presented which uses the quoted lead time and price as a mechanism to determine the optimal demand level. The relationships between the model parameters and their impacts on the firm's profit is also analysed. In addition, the effect of the number of job requests, and the mean processing time are examined. Based on the results presented in this paper, there is clear indication that the firm's profit is sensitive to the inventory holding rate, and that the inventory holding cost component is redundant in the presence of a tardiness cost component.     

The robustness of the systemwise breusch-godfrey autocorrelation test for non-normal distributed error terms

Using Monte Carlo methods, the properties of systemwise generalisations of the Breusch-Godfrey test for autocorrelated errors are studied in situations when the error terms follow either normal or non-normal distributions, and when these errors follow either AR(1) or MA(1) processes. Edgerton and Shukur (1999) studied the properties of the test using normally distributed error terms and when these errors follow an AR(1) process. When the errors follow a non-normal distribution, the performances of the tests deteriorate especially when the tails are very heavy. The performances of the tests become better (as in the case when the errors are generated by the normal distribution) when the errors are less heavy tailed.