[Objective]The study aimed to discuss the optimal conditions of extracting humic acids from brown coal using hydrogen peroxide(H2O2).[Method]Fulvic acid(FA) was
[Objective]The aim was to study climate change trend in Cangzhou City in recent 38 years. [Method]Based on the climate date such as temperature,precipitation,su
<正> 向外国学习,引进先进的科学技术,是后进国家加速经济发展步伐,在短期内赶超世界先进水平的重要途径。第二次世界大战后,日本就是通过引进国外先进技术来建立本国的科技体系,从而实现经济高速增长的。日本从五十年代初开始,一直把引进国外先进科学技术定为国策,称之为“吸收性战略”。在1950——1979年3月这二十九年中,日本共引进国外新技术35,995件(其中甲种技术18,523件),支付外汇近104亿美元。引进技术之多,居世界首位。由于引进外国先
Waste pyrolysis technology as a new method of waste treatment induces more and more attention.Waste pyrolysis technology is not only good for garbage reduction,
Being sensitive to climatic conditions,the growth of Litchi chinensis( lychee) can be greatly affected both in rainy warm winter which is conductive to winter s
<正> 认识源泉问题,是认识论所要研究的重要课题之一。在最近关于这个问题的讨论中,意见极为分歧:是“客观实在才是认识的唯一源泉”呢,还是“实践是认识的源泉”?或者是两个命题一致,都能成立?众说纷纭,各执一端。为了和大家一起求得对于认识源泉问题的全面的、科学的理解,我们借本文发表一点浅见。
<正> 鲍照"才秀人微,取湮当代"(钟嵘:《诗品》),然而他谢世后不久,其创作的"超丽"(虞炎:《鲍照集序》)就引起了齐代文学家们的注意;至梁,其影响则直侵凌谢、颜,构成了"师范宋集"(刘勰:《文心雕龙·情采篇》)的主流派,形成了风靡盛行的"鲍照热".齐梁的文论家们特别是梁的文论家们对此颇为惊奇乃至不满,故而多发批评之辞.因此,客观认识鲍照在齐梁的文学地位,正确揭示"鲍照热"盛起的原因,认真辨析文论家们对于鲍照的批评,这在鲍照研究中当是颇有意义.
[Objective]The study aimed to discuss the influence of light and temperature factors on biomass accumulation of winter wheat at each growth stage and changes in
Based on the field investigation,the flora of spermatophyte in Xinluhai Nature Reserve was analyzed. The results showed that there were 41 families,99 genera an
[Objective] The aim was to address the difficulty of long pipe for centralized sewage treatment in campus life and difficulty in use.[Method] Though the four in