近代留美学生与中美教育交流研究

近代留美学生既是中美教育交流的产物,也是学习与回报美国教育、有组织交流的主要动力与媒介。他们推动的交流在实践中虽有种种局限,但在双向、平等、立体的进行中仍不失灵活、深刻而日趋完整。     

测定二氧化碳分子量的微型实验

利用自制的简易气体发生器和洗气装置对二氧化碳分子量测定微型实验作了进一步的探索和实践、测定结果不仅达到无机化学实验对测定精度的要求。而且更便于推广和普及．     

新硼试剂3—甲氧基—甲亚胺H与硼显色反应的研究

对新硼试剂3-甲氧基-甲亚胺H与硼显色反应体系研究结果表明,在pH=5的醋酸-醋酸铵缓冲体系中,硼与3-甲氧基-甲亚胺H在常温下形成2:3的黄绿色配合物,配合物稳定24h以上,λmax=410nm,ε550=6.82×104cm·mol-1·L-1,硼含量在0～2.5μg/25mL范围符合比耳定律.     

N-硝基-N-氨基(取代)甲酰-2,4,6-三氯苯氨类化合物的合成

合成了两种新型兼有植物生长调节剂和除草剂功效的N硝基 -N -氨基 (取代 )甲酰 - 2 ,4 ,6 -三氯苯氨类化合物 ,并经元素分析、红外光谱等证实了它们的结构 .     

On Rao score and PearsonX 2 statistics in generalized linear models

The identity of the Rao score and PearsonX ² statistics is well known in the areas where the latter was first introduced: goodness-of-fit in contingency tables and binary responses. We show in this paper that the same identity holds when the two statistics are used for testing goodness-of-fit of Generalized Linear Models. We also highlight the connections that exist between the two statistics when they are used for the comparison of nested models. Finally, we discuss some merits of these unifying results. Work financially supported by cofin. MIUR grants 2000 and 2002.     

意识形态视角下的美国对华政策

作为一种系统的认识论或道德信念模式,意识形态在各国的外交政策中事实上起着世界观和方法论的作用。美国虽然号称最讲究“实用主义”,但它的对外政策同样也一直深受其意识形态的影响,尤其明显地反映在它的对华政策中。意识形态依然是美国决定其对华政策的一个重要原因。     

高羊茅愈伤组织的诱导与内源激素含量研究

该利用高羊茅种子的离体成熟胚作体植体接种到2，4-D浓度梯度的培养基上进行了愈伤组织诱导，发现2.5mg/L2,4-D是愈伤组织的最佳诱导生长激素，同时利用反相高效液相色谱法测定了愈伤组织和相应的黄化种子苗中的内源激素赤霉酸（GA3），玉米素（ZT），吲哚乙酸（IAA），脱落酸（ABA），吲哚丁酸（IBA）的含量，发现胚性愈伤组织的内源激素（EC）比非胚性愈伤组织（NEC）总含量要高，各种激素在两种愈伤组织与黄化种子苗中的比例也与献报道的相似。     

AN ALGORITHM FOR THE CONSTRUCTION OF OPTIMAL OR NEAR-OPTIMAL CHANGE-OVER DESIGNS

This paper presents an algorithm for the construction of optimal or near optimal change-over designs for arbitrary numbers of treatments, periods and units. Previous research on optimality has been either theoretical or has resulted in limited tabulations of small optimal designs. The algorithm consists of a number of steps:first find an optimal direct treatment effects design, ignoring residual effects, and then optimise this class of designs with respect to residual effects. Poor designs are avoided by judicious application of the (M, S)-optimality criterion, and modifications of it, to appropriate matrices. The performance of the algorithm is illustrated by examples.     

21世纪的美国社会保障:趋势与借鉴

美国社会保障的未来趋势是：预期寿命延长、劳动力数量增长缓慢、退休人数增加、退休年龄不断提前，这些共同加剧了社会保障收支不平衡状况，企业成为社会保障的生力军，社会保障事业出现私有化和私营化苗头。其借鉴意义：重视预期寿命延长对社会保障的压力，及早为延长退休年龄做好准备工作，重新定位企业在社会保障制度中的地位，改善社会保障的管理工作。     

On the asymptotic normality of the L1- and L2-errors in histogram density estimation

The L₁ and L₂-errors of the histogram estimate of a density f from a sample X₁,X₂,…,Xn using a cubic partition are shown to be asymptotically normal without any unnecessary conditions imposed on the density f. The asymptotic variances are shown to depend on f only through the corresponding norm of f. From this follows the asymptotic null distribution of a goodness-of-fit test based on the total variation distance, introduced by Györfi and van der Meulen (1991). This note uses the idea of partial inversion for obtaining characteristic functions of conditional distributions, which goes back at least to Bartlett (1938).