西南喀斯特区域土地利用与石漠化相关性分析——以环江毛南族自治县为例

基于两期石漠化和土地利用数据,定量分析了环江县各区不同等级石漠化土地中土地利用类型的分布规律和不同土地利用类型的石漠化发生率。研究发现,不同等级石漠化与不同土地利用类型存在着相关性,且这种关联性地域差异明显,受土地利用状况、人类活动强度等因素的制约。不同土地利用方式对不同土地生态系统的干扰效应和干扰过程是不一样的,导致喀斯特石漠化土地退化过程、退化程度、退化群落特征有异,最终表现在恢复方式和恢复难度的差异上。     

ECONOMETRIC ANALYSIS OF EUROPEAN CARBON DIOXIDE EMISSIONS BASED ON RECTANGULAR SUPPLY-USE TABLES

This paper formalises the so-called Supply-Use Based Econometric (SUBE) approach that allows for the introduction of econometric analysis in the calculation of backward input–output multipliers of the Leontief-type quantity model, using rectangular supply and use tables. The SUBE approach does not require any kind of inverse matrix and incorporates the traditional approach (with square supply-use tables) as a particular case. The empirical analysis shows that the SUBE carbon dioxide multipliers for the EU27 are considerably lower than those obtained by the traditional Leontief inverse. In an application of the SUBE approach, the European economy appears to emit about 10% less carbon dioxide than in a situation in which it would not import any intermediate inputs from outside the EU27.     

Young adults’ attitudes towards credit

This research project was undertaken to study young adults’ attitudes towards credit in general. A sample of 980 young Canadian adults, ages 18–29, participated in a telephone survey. Results reveal that they recognize both the advantages and the risks associated with credit. Regression analysis shows that attitudes towards credit is positively related to education, the number of credit cards held and knowledge of credit, but negatively related to the number of children. The young adults who reported that their parents and friends are heavy credit users are more likely to have positive attitudes towards credit. No link was found with the participants’ level of debt.     

构建我国合理用药知识传播机制的研究

如今,我国居民的自我药疗比例逐渐升高,但是从诸多调查数据来看,其自我药疗水平并不高,在这种情况下,开展药物知识的宣传教育是非常有必要和有意义的。文章从信息通讯技术的角度出发,构建了基于信息通讯技术的我国合理用药知识传播机制的基本框架。     

土地利用与交通小区发生吸引量关系研究

针对以往研究估计单位面积交通吸引权重方法的不足,本研究将仅由土地类型决定的单位土地面积交通发生量指标剥离出来,并通过优化模型估计其值;建立了由单位土地面积交通发生量作为基本量,其它土地特征指标作为调整系数的交通小区发生吸引量模型,并采用大连市进行实例分析,验证了该方法的有效性。     

大专生网络使用及成瘾状况调查

该文通过对1200名高职高专在校学生的网络使用情况和网络成瘾状况的调查,发现上网已经成为大学生业余生活的主要活动方式,学生对网络的使用娱乐性大于工具性,绝大多数学生能健康地使用网络,约4%-5%的学生存在过度使用网络而成瘾的症状。教育者要对学生进行网络成瘾的预防性教育,并通过对已经网络成瘾的学生进行有效的干预和建设网络教育平台,消除网络的负面影响,发挥它正面的积极作用。     

PDCA管理模式在电力工程管理中的运用分析

PDCA管理模式是一种循环、动态的管理模式,该种模式具有科学性、高效性的特征,本文主要分析PDCA管理模式在电力工程管理中的运用。     

Worker search effort as an amplification mechanism

It is well known that the Diamond–Mortensen–Pissarides model exhibits a strong trade-off between cyclical unemployment fluctuations and the size of rents to employment. Introducing endogenous job search effort reduces the strength of the trade-off while bringing the model closer to the data. Ignoring worker search effort leads to a large upward bias in the elasticity of matches with respect to vacancies. Merging the American Time Use Survey and the Current Population Survey, new evidence in support of procyclical search effort is presented. Average search effort of the unemployed is subject to cyclical composition biases.     

Consequences of out-migration for land use in rural Ecuador

In rural Ecuador and elsewhere in Latin America, the departure of migrants and the receipt of migrant remittances have led to declining rural populations and increasing cash incomes. It is commonly assumed that these processes will lead to agricultural abandonment and the regrowth of native vegetation, thus undermining traditional livelihoods and providing a boon for biodiversity conservation. However, an increasing number of household-level studies have found mixed and complex effects of out-migration and remittances on agriculture. We advance this literature by using household survey data and satellite imagery from three study areas in rural Ecuador to investigate the effects of migration and remittances on agricultural land use. Multivariate methods are used to disaggregate the effects of migration and remittances, to account for other influences on land use and to correct for the potential endogeneity of migration and remittances. Contrary to common assumptions but consistent with previous studies, we find that migrant departure has a positive effect on agricultural activities that is offset by migrant remittances. These results suggest that rural out-migration alone is not likely to lead to a forest transition in the study areas.