With the development of low-end businesses,an extensive operation model,and lack of cutting-edge competitiveness,Chinese non-govemental enterprises in the “pla
施用氮肥是提高作物产量的重要手段。然而，越来越多的氮肥投入不可避免地导致大量未被作物吸收利用的矿质氮素残留在农田土壤，进而污染地表、地下水体和大气等生态环境。本文首
This article is a historiographical review that traces the origin of the different roles assigned to Brumaire by some of the most important and/or original hist
In recent years,China’s accelerated urbanization is approaching the ting point from the conventional urbanization to neo-urbanization.At this critical stage,it
The general narration of world history after 1500 is divided into two successive stages:the early modem and modem periods.Demarcated roughly by 1800,they are us
Studies on colonial history have long been trapped either by the binary framework of the imperial history or by the linear narrative of the national history.How
As an expert on Jewish studies in China,Zhang Qianhong has published several books conceming Judaism,Jewish culture,Jewish thought and Israeli economy.The prese
Nowadays,the urbanization wave in China is in the ascendant.It is changing China’s landscape in many respects,and bringing many challenges.The Middle East is t
Over sixty years ago,when the People’s Republic of China was established,Byzantine history (拜占庭史) was rarely touched upon by Chinese scholars.Now Byzantine
稀土元素(Rare Earth Elements,REEs)现已广泛应用于冶金、机械、化工和农牧养殖等传统产业领域,因为可以显著改善产品性能和增加产量等优良特性,一直成为各个国家优先开发和发展的热点。我国是稀土的大国,稀土的开发利用一直受到高度重视。特别是近 30 年来稀土肥料在农业领域的大量推广应用,增产提质的同时,无疑也加速了环境中稀土元素的富集和积累。稀土进入环境后,对生态,生物和人体的负面