论新形势下乡镇政府职能的转换

我国乡镇政府工作和乡镇政府职能面临着许多新问题。因此,提出乡镇政府职能要由全能的无限责任政府转变为有限责任政府、要由忙于应付的任务型政府转变为公共服务政府、要由错位的权责脱节型政府转变为权责对等型政府的转换路径,并从行政体制改革、组织设置、队伍建设、财政改革以及社会中介组织培育等方面提出了推动乡镇政府职能转换的具体措施。     

文化建设的四重路向与中华民族凝聚力

文化建设既要坚持民族立场,又要有全球视野;既要加强主流文化的建构,又要注重大众文明的建设;既要传承传统社会的道德精神,又要注重法理社会契约精神的培育;既要提高公民的基本素养,还要培养公民的现代意识。中华民族凝聚力在文化建设四重路向的影响下,具有合理的开放性、不同的凝聚层次以及适应时代发展的价值取向与新型主体。     

Empirical Likelihood for the Additive Hazards Model with Current Status Data

We investigate empirical likelihood for the additive hazards model with current status data. An empirical log-likelihood ratio for a vector or subvector of regression parameters is defined and its limiting distribution is shown to be a standard chi-squared distribution. The proposed inference procedure enables us to make empirical likelihood-based inference for the regression parameters. Finite sample performance of the proposed method is assessed in simulation studies to compare with that of a normal approximation method, it shows that the empirical likelihood method provides more accurate inference than the normal approximation method. A real data example is used for illustration.     

Assessing the effects of land use and land cover patterns on thermal conditions using landscape metrics in city of Indianapolis,United States

Direct applications of remote sensing thermal infrared (TIR) data in landscape ecological research are rare due to limitations in the sensors, calibration, and difficulty in interpretation. Currently there is a general lack of methodology for examining the relationship between land surface temperatures (LST) derived from TIR data and landscape patterns extracted from optical sensors. A separation of landscapes into values directly related to their scale and signature is a key step. In this study, a Landsat ETM+ image of Indianapolis, Unites States, acquired on June 22, 2000, was spectrally unmixed (using spectral mixture analysis, SMA) into fraction endmembers of green vegetation, soil, high albedo, and low albedo. Impervious surface was then computed from the high and low albedo images. A hybrid classification procedure was developed to classify the fraction images into seven land use and land cover (LULC) classes. Using the fractional images, the landscape composition and pattern were examined. Next, pixel-based LST measurements were correlated with the landscape fractional components to investigate LULC based relationships between LST and impervious surface and green vegetation fractions. An examination of the relationship between the LULC and LST maps with landscape metrics was finally conducted to deepen understanding of their interactions. Results indicate that SMA-derived fraction images were effective for quantifying the urban morphology and for providing reliable measurements of biophysical variables. LST was found to be positively correlated with impervious surface fraction but negatively correlated with green vegetation fraction. Each temperature zone was associated with a dominant LULC category. Further research should be directed to the theoretical and applied implications of describing such relationships between LULC patterns and urban thermal conditions.

Outlier detection and robust variable selection via the penalized weighted LAD-LASSO method

This paper studies the outlier detection and robust variable selection problem in the linear regression model. The penalized weighted least absolute deviation (PWLAD) regression estimation method and the adaptive least absolute shrinkage and selection operator (LASSO) are combined to simultaneously achieve outlier detection, and robust variable selection. An iterative algorithm is proposed to solve the proposed optimization problem. Monte Carlo studies are evaluated the finite-sample performance of the proposed methods. The results indicate that the finite sample performance of the proposed methods performs better than that of the existing methods when there are leverage points or outliers in the response variable or explanatory variables. Finally, we apply the proposed methodology to analyze two real datasets.     

China’s Economic Development and Development Economics Innovation

China has experienced rapid economic growth since its reform and opening up 40 years ago. The prime mover and key driver of these amazing achievements originated in China’s transformation from a planned economy to a socialist market economy, and from a closed economy to an open economy. The optimal allocation of the various factors of production and the interaction of economic growth and structural upgrading also played a significant part. China’s economic growth over the 40 years has applied, and proven effective, the general principles of development economics, and more importantly, based on the realities of China, it has contributed to theoretical innovation and institutional innovation, leading China along the road of socialism with Chinese characteristics. Entering the new era, China is committed to building a modern economic system and promoting high-quality development under the guidance of the new development concepts of innovation, coordination, green development, opening up and sharing.     

双耦合腔链慢波系统的色散分析

采用模拟场方法对由二隙缝耦合腔链所构成的“捆扎式”双通道慢波系统进行了分析,得到该结构的色散方程及耦合阻抗的变化趋向,并与传统单耦合腔链慢波结构的色散特性进行了比较。     

轴不对称联芳香化合物的研究5.(+)-和(-)-9,9’-联菲-10,10’-二甲酸的合成

文中讨论了(+)-和(-)-9,9′-联菲-10,10′-二甲酸的合成路线设计.选出了最佳的合成路线,其中关键中间体是10-溴-9-菲甲酸.其合成方法是在碱性条件下使9-菲甲酸与溴溴化钾—DMF发生10-位溴代反应,产率很好.研究中也探讨了U11mann反应的条件。合成所得的光学纯的(+)-和(-)-9,9′-联菲-10,10′-二甲酸在碱性和中性条件下均难以消旋,说明它有僵硬的轴不对称结构.     

从群体遗传的DNA线索看东乡族族源问题

DNA分析技术的发展为进行民族识别和分析民族起源、迁徙、流动、融合提供了新手段。本文在国内外首次应用D13S317基因座第 11号等位基因频率指标 ,计算了东乡族群体遗传动态数据。结果发现 ,东乡族和回族遗传距离很近 ,且东乡族中具有白种人血缘混杂。结合其他有关资料 ,我们认为东乡族的起源与元代蒙古军带来的中亚工匠、签军有关 ,亦与当地蒙古族、回族、藏族人群的融合有关。本文的研究结果可以为民族研究提供群体遗传方面的线索