近日,一老叟跌倒路边,奄奄待毙,然气息尚存。百二行人侧目驻足,竟无一援者。至翁驾鹤西飞,终而散去。予怀怆然,义愤难平,遂心书此行,以明吾志。人生七十古来稀,养孙怡乐享佳
The theoretical framework for the cascaded four waves mixing (CFWM) in gas-filled capillary by fs pulses is constructed. Based on the theoretical framework, the
企业的环境责任是企业对社会所承担的环境保护义务。本文通过分析我国目前企业环境责任立法的不足,提出完善该项立法需从明确企业环境责任、健全资源利用法律制度以及注意相关配套法律制度的建设入手,最终促使企业主动采取措施合理利用资源,做到清洁生产。
For the Generalized Linear Model (GLM), under some conditions including that the specification of the expectation is correct, it is shown that the Quasi Maximum
This paper reviews the research on land use change and its corresponding ecological responses. Patterns of land use changes in spatio-temporal level are produce
This research was designed to help solve existing sustainable use problems such as soil nutrient loss and soil fertility decline in natural rubber plantations l
Nitrogen, phosphorus, and potassium balances for agroecosystems in China from 1993 to 2001 were calculated at national and provincial levels using statistical d
The method of residue analysis of a new synthesized fungicide 2-allylphenol was studied by simulating the active compound structure in Gingko tree( Gingko bilob
一颗直径约400米、体积与一艘航母相似的小行星于美国东部时间2011年11月8日6时28分与地球擦肩而过。与地球相差的距离是32.46万千米,假如撞击地球将相当于500枚核弹同时在地
The track of Typhoon Haitang (0505), which passed through the Taiwan Island and landed again,has been successfully simulated by using the non-hydrostatic mesosc