关于中国粮食科技发展问题的几点思考

在分析我国粮食科技发展存在的主要问题和面临的发展机遇的基础上,提出了我国“十一五”粮食科技的发展方向和落实《“十一五”粮食科技发展指导意见》的工作建议。     

Nonparametric control charts based on runs and Wilcoxon-type rank-sum statistics

In this article, we introduce three new distribution-free Shewhart-type control charts that exploit run and Wilcoxon-type rank-sum statistics to detect possible shifts of a monitored process. Exact formulae for the alarm rate, the run length distribution, and the average run length (ARL) are all derived. A key advantage of these charts is that, due to their nonparametric nature, the false alarm rate (FAR) and in-control run length distribution is the same for all continuous process distributions. Tables are provided for the implementation of the charts for some typical FAR values. Furthermore, a numerical study carried out reveals that the new charts are quite flexible and efficient in detecting shifts to Lehmann-type out-of-control situations.     

Intention to emigrate in transition countries: the case of Albania

We analyse the profile of potential emigrants from Albania using data from the Central and Eastern Europe Eurobarometer in 1992. Respondents were asked to rate on a four-point scale the likelihood that they would go to live in Western Europe. Our results show that intention to emigrate is correlated positively with males, education and certain occupations, and negatively with age. There is little relation between emigration and income. Those who support the introduction of a free market in Albania are also more likely to emigrate than those who do not. Received: 24 August 1998/Accepted: 17 April 2000     

四川省“十一五”期间“民族问题”研究述评

"十一五"期间,四川省"民族问题"研究已经形成了良好的发展势头,"民族问题"研究工作者和民族工作战线的广大工作人员,取得了令人瞩目的成绩,主要表现在学术机构、学术队伍和学科建设的新发展以及社科基金项目大幅攀升等方面。这些成就为"十二五"期间"民族问题"研究的发展跃上一个新台阶奠定了很好的基础。但是,也存在一些问题:国家社科基金侧重应用研究和对策研究,事实上削弱了基本理论的研究,"体"与"用"出现失衡,从长远而言,不利于我国哲学社会科学的繁荣发展;理论研究的失误和缺失势必带来政策与工作的失误。实事求是地总结近60年来我们民族工作正、反两个方面的经验教训,评估我们当前的民族问题和民族工作状况,改进我们下一步的民族工作是我们面临的一个重要课题。     

YAG:RE3+(RE=Eu,Tb)的制备及发光特性研究

利用柠檬酸-凝胶方法,以Y2O3,Eu2O3,Tb4O7和Al(NO3)3·9H2O作为初始原料,柠檬酸作为配位剂,成功制备出了Y3Al5O12:Eu3+(Tb3+)发光材料,其烧结温度为1?000℃,时间4?h.通过X射线衍射测试,表征Y3Al5O12为单相;计算其晶胞参数,发现晶胞体积v随着pH值的增大而增大.对Y3Al5O12:Eu3+(Tb3+)系列样品在紫外光谱区域和真空紫外光谱区域的发光性能进行了研究,结果表明:在真空紫外光谱区域激发下,Eu3+(Tb3+)的猝灭浓度比在紫外光谱区域激发下的低.     

Banking on fewer children: financial intermediation,fertility and economic development

This paper shows that financial intermediation can influence fertility and labor allocation decisions by raising market wages. The increase in wages induces some households to abandon “traditional” labor intensive methods of production managed at the household level and supply labor to “modern” sector firms. Since it is optimal for households in the modern sector to have fewer children, the labor allocation decision leads to lower national fertility. A panel VAR using financial intermediation, fertility and industrial employment share data in 87 countries is estimated. The empirical results show that the data are consistent with the theoretical predictions. Received: 20 October 1997/Accepted: 31 August 1998     

“S+V+R+O”双核谓词格框架研究

在“S +V +R +O”句式中 ,由于述语中心动词V价的不同、宾语的不同 ,补语R语义指向的不同 ,主语S、述语V、补语R、宾语O构成一个复杂的语义网络。弄清楚其中的语义网络 ,就可以着手建立“S +V +R +O”双核谓词格框架了。建立双核谓词格框架 ,可以促进对句子的理解 ,促进现代汉语格系统的建立