论文部分内容阅读
不同水稻土上施肥对土壤氮磷供应和水稻生长的影响
【机 构】
:
沈阳农业大学
【出 处】
:
沈阳农业大学
【发表日期】
:
1991年期
其他文献
五种土产药用品待开发出口综合国际医药市场情况分析,目前我国亟等开发出口的药用品种有以下五种:一、水蛭(蚂蝗)。治跌打损伤、瘀血等症,欧美国家渐用水蛭治病,需求量日增,较为抢手
This paper presents 28 GHz path loss model based on cluster obtained from channel measurement campaigns with rotating platforms and directional antennas in the
Event detection remains a challenge because of the difficulty of encoding the word semantics in various contexts.Previous approaches have heavily depended on la
Cultural heritage is the asset of all the peoples of the world. The preservation and inheritance of cultural heritage is conducive to the progress of human civilization. In northwestern China, there i
,45-GHz and 60-GHz 90 nm CMOS power amplifiers with a fully symmetrical 8-way transformer power comb
In this paper,45 GHz and 60 GHz power amplifiers (PAs) with high output power have been successfully designed by using 90 nm CMOS process.The 45 GHz (60 GHz) PA
孟县的赵军同志来信说,每年麦收后,都有大量的麦秆无法处理,除一部分用于种菇、沤粪外,大部分麦秆都一烧了之,很是可惜。问有没有什么好的办法使这些麦秆能够更好的利用起来
,Channel measurements and models for high-speed train wireless communication systems in tunnel scena
The rapid developments of high-speed trains (HSTs) introduce new challenges to HST wireless communication systems.Realistic HST channel models play a critical r