This paper tries to present another theoretical view in the study of population geography by applying the principle of artificial neural network.It is our view that the approach to population geograph
Based on defition of desertification in Intematonal Convention toCombat Desertfication. and on Chinas situation, desenification is found notonly In and and senuand ropons but also in huAnd and subhunu
The method to determine the surface albedo using satellite date hasbeen developed and discussed. The relatons betwam the planetary albedo andsurfoce albedo in clear skies are derived with the help
The oases environment of arid lands in Northwest Chinahas been improved during recent 40 years, but the generalenvironments out of the oases have been deteriorating. This aniclediscusses the cause and