染出雪山的缤纷

9月中旬我在拉萨找不到同行的伙伴,只好一人上路了。     

A note on specification of climate variables in models of population migration

"In the literature on population migration, increasing attention has been devoted to quality-of-life factors. Measures of temperature (as proxies for climate) have frequently been employed in empirical work regarding the determinants of population migration decisions. A wide range of such specifications have been used, most of which imply restrictions on the preferences of migrants. In this paper, a variety of temperature variable specifications are analyzed and interpreted. Statistical tests for nested and nonnested hypotheses are used to compare and choose among the various specifications." The model is used to analyze interstate migration in the 48 contiguous states of the United States for the period 1975-1980.     

穿越欧亚 深度自驾贝加尔湖

进入他们的生命旅程/领悟他们的思想轨迹感受他们的情感世界/探寻他们的社会影响让我们与他们面对面……     

穿越罗布泊，遥想与悼念

旅游地:罗布泊时间:2006年11月出行者:BJ咖啡决定穿越罗布泊沙漠的时间很短,从联系到安排行程只用了4天。算算时间,开车从北京到乌鲁木齐就需要3天,还不如飞往乌鲁木齐再开越野车比较理想。罗布泊地处甘肃、青海省与新疆维吾尔自治区搭界处,大部分位于新疆境内,天山山脉的东南部。它北依库鲁塔格山脉(天山余脉),南临阿尔金山北麓与昆仑山山脉东北角。东接敦煌,西连塔克拉玛干沙漠。对罗布泊沙漠的危险性是略知一