从一九七八年年底起,美国《读者文摘》用十五种文字出版。其中有中文版。另外还有盲文版、大号字版和录音带版。它在美国国内的销数是一千八百三十万册,在国外的销数是一千
The depletion interactions between two large-spheres immersed in a fluid of small spheres under unsymmetrical geometrical confinement are studied through the ac
随着全球经济的快速发展和二氧化碳排放量的逐年增加,高温热害的发生频率日趋频繁,严重时导致农作物大面积减产和产品品质下降。面对这样的栽培逆境,如何稳定和提高作物产量,确保农业经济和粮食安全,已成为农业科技领域迫切需要解决的重大科研课题。水稻是最重要的粮食农作物,全球有一半以上的人口以水稻为主食。因此,在全球平均气温逐年上升的背景之下,我们迫切需要解决水稻耐高温的难题,这对我国粮食安全和农业可持续发展
Non-local electron transport in laser-produced plasmas under inertial confinement fusion (ICF) conditions is studied based on Fokker-Planck (FP) and hydrodynami
油菜作为重要的油料作物,提高其单产水平是我国发展油菜生产亟待解决的瓶颈问题。油菜增产途径主要是应用具有高产潜力的优良品种,通过采用不同栽培措施,构建高光效群体来实现的。本试验以9个油菜品种为试验材料,以华油杂9号和华油杂62为主要研究对象,设置不同播期、密度和氮水平,构建不同油菜群体结构,观测全生育期叶片和角果皮面积指数的消长变化,探究各群体指标与产量的关系,以期得出油菜3000kg/hm2高产条
The influence of multi-photon pulses on practical differential-phase-shift quantum key distribution (DPS-QKD) is analysed. We have estimated the information whi
Using transmission electron microscopy (TEM) and x-ray diffraction analysis, we have studied the structural and morphological evolution of highly Er/Yb co-doped
This paper reports on laser surface remelting experiments performed on a Zn-2wt.%Cu hypoperitectic alloy by employing a 5kW CW CO2 laser at scanning velocities
十六大以来,农业部围绕“三农”工作中带有全局性、战略性和前瞻性的重要问题和难点、焦点问题,面向地方农业系统干部,开展了“农业产业结构调整”、“农村劳动力转移”、“
In this paper the multiwalled carbon nanotubes (MWNTs) were synthesized by a chemical vapour deposition and the SEM graph shows that the sample has good constru