严独鹤先生是新闻界的前辈,是著名的爱国新闻工作者。虽然他离开我们已经十八个年头了,但他献身我国新闻事业的崇高精神,是值得我们学习的;他毕生办报留下的丰富经验,需要我
We investigate the diffraction characteristics of an incident Gaussian beam cut by a straight edge bounding a semi-infinite opaque plane using Kirchhoff scalar
玉米是一种最重要的禾本科作物,它能够为全世界提供粮食、饲料及生物能源。但在玉米的生长发育过程中,会受到各种各样的逆境胁迫,其中以干旱和盐碱胁迫最为严重,最终影响玉米的产量。利用传统育种的方法已经获得一些抗旱或者耐盐的玉米新品种,但是传统育种的方法比较耗时、耗力和耗钱。随着生物技术的迅速发展,利用转基因方法获得抗旱或者耐盐的玉米品种成为了一种可能。拟南芥的AtHDG11(HOMEODOMAIN GL
玉米（Zea mays L.）是重要的粮食、饲料和工业原料作物，近年来其种植面积和总产量已成为我国第一大作物。玉米瘤黑粉病是一种世界性病害，广泛分布在各玉米栽培地区，常为害玉米叶、
The recording density of multilevel photochromic memory is limited by the signal-to-noise ratio (SNR) of the readout signal. In this paper, shot noise and mater
Spiral waves have been controlled by generating target waves with a localized inhomogeneity in the oscillatory medium. The competition between the spiral waves
By use of an auxiliary equation and through a function transformation, the Jacobi elliptic function wave-like solutions, the degenerated soliton-like solutions
With a coupling laser locked to caesium 6S1/2 Fg=4-6P3/2Fe=5 cycling transition and a co-propagating probe laser scanned across 6S1/2Fg=4-6P3/2Fe=3, 4 and 5 tra
近年来,随着马铃薯产业的快速发展,宁夏南部山区常年大面积种植,改变了马铃薯原有的生产布局,致使轮作倒茬困难,连作障碍问题日益突出,造成马铃薯地上部和地下部生长发育减弱、土壤养分含量下降,微生态环境改变等状况,研究通过两年田间定位试验和室内分析实验,结合磷脂脂肪酸(PLFA)、Biolog Eco板等技术手段,以单作马铃薯、蚕豆、荞麦,马铃薯//蚕豆、马铃薯//荞麦为处理,研究了马铃薯不同间作模式对
By taking full account of the non-orthogonality of the orbitals between the low-lying doubly excited states 1po and the singly excited states 1Se and 1 De of He