求解一类单向函数的 TMP 权衡方法

针对求解一类具有良好伪随机性的单向函数,利用ＴＭＰ权衡技术,提出了一种新型的迭代算法．经过分析,此算法在计算上是可行的：其时间复杂度Ｔ～ｌｔ,空间复杂度Ｍ～ｍ,（其中ｍｌｔ≥Ｎ,Ｎ是所求问题定义域中元素的个数）,且此算法将以极大概率（在随机性假设下,以１概率）在上述时空复杂度内得出所求结果;同时,对特殊问题ＤＥＳ进行复杂度分析,证明了此算法的优越性．     

Simplified hybrid white organic light‐emitting diodes with efficiency/efficiency roll‐off/color rendering index/color‐stability trade‐off

A high‐performance hybrid white organic light‐emitting diode (WOLED) based on a simple structure has been developed. The resulting device exhibits a maximum total current efficiency and power efficiency of 35.7 cd/A and 30.6 lm/W, respectively. Even at a high luminance of 1000 cd/m², a current efficiency of 32.0 cd/A and a power efficiency of 19.4 lm/W are obtained, suggesting that the device exhibits a low efficiency roll‐off. Besides, the device shows excellent color‐stability during a wide range of luminance and a high color rendering index (CRI) of 83 is obtained. Moreover, the origin of the superior properties is explored comprehensively. Such achieved results demonstrate that high efficiency, low efficiency roll‐off, stable color and high CRI can be simultaneously realized in a simplified hybrid WOLEDs. (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)     

爆发型种群铜锤草的数量动态研究

外来杂草入侵我国广大地区造成的严重危害迫切要求加大对外来杂草的研究.针对重庆地区外来种铜锤草(Oxalis corymbosa)危害严重的状况,通过不同生境下铜锤草种群在一个生长季的数量动态的研究,对其生态学特征及适应对策有了初步了解,结果表明:1) 铜锤草分株种群的死亡率的密度效应显著,高密度种群死亡率较高; 2) 叶构件种群和留土鳞茎种群数量随季节变化有显著的负相关关系; 3) 铜锤草种群生物量结构及光合面积动态与环境之间的整合特征显著,表现为不同生境铜锤草种群生物量指标及叶面积指数增长速度和持续时间不同,生物量在光合体与非光合体之间的分配不同.