树和图在关系型数据库中的表示及遍历

树型结构和图型结构是表示客观事物的两个非常重要的数据结构,本文结合实例给出了树型数据结构和图型数据结构在关系型数据库中的表示方法以及相应遍历的存储过程。     

Confidence intervals for high-dimensional multi-task regression

Regression problems among multiple responses and predictors have been widely employed in many applications, such as biomedical sciences and economics. In this paper, we focus on statistical inference for the unknown coefficient matrix in high-dimensional multi-task learning problems. The new statistic is constructed in a row-wise manner based on a two-step projection technique, which improves the inference efficiency by removing the impacts of important signals. Based on the established asymptotic normality for the proposed two-step projection estimator (TPE), we generate corresponding confidence intervals for all components of the unknown coefficient matrix. The performance of the proposed method is presented through simulation studies and a real data analysis.     

用马斯洛自我实现者的爱情理论解读乔的婚姻选择

爱情是文学作品经久不衰的主题《。小妇人》的主人公乔独立、坚强、执着,最终如愿成为了名利双收的作家。但是,乔的婚姻选择令万千读者感到费解:一再拒绝和她青梅竹马、年轻又多金的劳里的追求,多年后,选择了半路结识、年长又贫穷的巴尔。用马斯洛关于自我实现者的爱情理论重新分析乔的婚姻选择,即从需求认同和爱的力量与被爱的能力两个方面来解读这一选择背后的原因:乔和劳里的需求截然不同,难以从内心深处理解和体谅对方,同时,他俩相遇时不具备爱的力量与被爱的能力。而巴尔和乔需求相似,能够感同身受,而且巴尔出现时,乔已相对成熟,双方拥有了爱的力量与被爱的能力,因此最终步入了婚姻的殿堂。     

山西省属科研院所改革转制进程回顾

文章回顾了山西省属科研院所改革特别是开发类院所企业化转制的历程及进展情况。     

方兴未艾的纳米医学

纳米技术是20世纪末期刚刚兴起的新技术，也是21世纪的科技发展前沿。文章着重介绍了纳米技术给医学领域带来的新变革。     

A Novel RAFT Polymerization under UV Radiation at Ambient Temperature

Reversible Addition Fragmentation chain Transfer （RAFT） polymerization has become a highly versatile technique for the controlled/“living” radical polymerization of a wide range of monomers under various conditions. The RAFT polymerization was carried out using a dithiocarboxylate or trithiocarbonate as a Chain Transfer Agent （CTA）, which mediates the growing chain radicals via an equilibrium. From both academic and industrial standpoints, it is clearly desirable to develop a RAFT process under mild conditions. Rizzardo, et al and McCormick＇s group have respectively reported RAFT polymerization using conventional radical initiators at ambient temperature by adjusting the structure of CTA. The RAFT Polymerization initiated by γ-radiation has also reported recently. Quinn, et al have reported the RAFT polymerization under UV radiation using CTA as the source of primary radicals at 42℃, which was well controlled at low conversions （below 20% ） but less controlled at higher conversions （over 20% ） due to the photolysis of CTA residues under UV radiation.     

山西科技人才队伍发展现状、问题及其成因分析

文章立足我省科技人才队伍发展现状，分析了目前存在的种种问题及其成因。     

让生命之树常青——二论科学保健养生

文章从健康长寿的角度出发，阐明了健康的内涵、健康的标准和人类的亚健康状态。     

Spatial and Temporal Distributions of Soil Organic Matter in the Mixed Plantations of Alder and Cypress in the Hilly Areas of Central Sichuan Basin

The investigation was conducted on the spatial and temporal distributions of soil organic mater （SOM） in the mixed plantations of alder （Aluns crernastogyne） and cypress （Cupressus funebris ） （MPAC）, which distributed in the hilly areas of central Sichuan Basin （HACSB）. The results show that： （1） the spatial distribution of SOM among different sites at the same age are not significant before 15-year-old, but significant at 20-year-old, and not significant again after 25-year-old; （2） the SOM contents in 0-15 cm and 15-30 cm layers increase sharply from 10- to 15-year-old, and decline gradually from 15- to 30- year-old; the SOM contents of the 30-year-old PCP were 80. 38% and 78.42% higher than that of the 10-year-old, but 29.16% and 53.37% lower than that of 15-year-old in the 0-15 cm and 15-30 cm layers, respectively. The decrease of SOM contents would lead to the degradation of soil fertility and the decline of forest productivity.     

论科技期刊的发展趋势

文章从分析科技期刊发展的历史与现状入手，预测了当代科技期刊的发展趋势。