贮藏马铃薯龙葵素的分布与含量

<正>马铃薯块茎的营养成分完全,易于吸牧。在国外一些国家和地区,马铃薯块茎是食品重要组成部分。在我国,马铃薯分布广、种植面积大,特别是     

Modular construction of P3HT/PCBM planar-heterojunction solar cells by lamination allows elucidation of processing–structure–function relationships

Contrary to polymer solar cells with bulk-heterojunction active layers, devices with planar-heterojunction active layers allow the decoupling of active layer phase separation from constituent crystallization, and their relative influence on device performance. We fabricated planar-heterojunction devices by first processing the electron donor and electron acceptor in isolation; they were subsequently laminated across the donor–acceptor interface to establish electrical contact. Thermal annealing was intentionally avoided after lamination to maintain the pristine charge transfer interface. Lamination thus obviates the need for solvent orthogonality; more importantly, it provides independent process tuning of individual organic semiconductor layers, ultimately allowing control over constituent structural development. We found the short-circuit current density of planar-heterojunction solar cells comprising poly(3-hexyl thiophene), P3HT, and [6,6]-phenyl-C₆₁-butyric acid methyl ester, PCBM, as the electron donor and acceptor, respectively, to be generally independent of the annealing history of P3HT. On the contrary, thermal annealing PCBM prior to lamination mainly led to a reduction in short-circuit current density. This deterioration is correlated with the development of preferentially oriented PCBM crystals that hinders electron transport in the vertical direction.     

Stable and accelerated procedure to calculate transient scattering using electric field integral equation

A stable and accelerated procedure for the electric field integral equation (EFIE) is developed. The procedure employs an implicit method in conjunction with a time averaging scheme to solve EFIE with the second-order time derivatives. Two examples are provided to demonstrate the superior stability and efficiency of the proposed procedure.     

高浓度Er~(3+)/Yb~(3+)掺杂硅酸盐玻璃波导放大器的增益特性研究

本文分析了高浓度Ｅｒ３＋／Ｙｂ３＋掺杂硅酸盐玻璃波导放大器,通过优化Ｅｒ３＋、Ｙｂ３＋离子的浓度,Ｅｒ３＋／Ｅｒ３＋离于对的影响可忽略,每个 Ｅｒ３＋离子可认为只与周围的 Ｙｂ３＋离子配对．数值结果表明,制作高增益和超短长度（厘米量级）的 Ｅｒ３＋／Ｙｂ３＋混合掺杂波导放大器是可能的．获得了 ２５ ｄＢ／ｃｍ的增益．     

如何利用NOMA2.0实现话务高峰时的动态话务控制

话务控制的目标是在最有效利用网络资源的前提下最大限度地疏通呼叫。话务控制有利于改善业务质量及增加网络收益。本文主要结合2000年9月高校刚开学时对200,201字冠的高话务冲击实施动态话务控制进行详细介绍。     

速度拖引干扰和杂波背景下脉冲多普勒雷达目标跟踪算法

针对在速度拖引干扰和杂波背景下脉冲多普勒(PD)雷达无法精确跟踪目标的问题,该文提出基于双模型(DM)和幅度信息(AI)的目标跟踪算法。分别建立基于位置、幅度量测的跟踪模型和基于位置、速度、幅度量测的跟踪模型。两个模型均使用基于幅度信息的概率数据互联(AI-PDA)尽可能地降低杂波的影响,然后使用常规方法进行滤波估计。若没有速度拖引干扰,则两个模型估计具有位置和速度上的相关性;若存在干扰,由于速度量测是虚假的,则两个模型估计不具有相关性。据此,进行卡方检验(chi-square test),分析影响检验结果的因素,进而确定最终的估计结果。仿真验证了该算法的有效性。     

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为筹集天然气工业发展急需的资金,本文提出在天然气价格未全面调整前,对超包干天然气实行议价,随行就市,直接受市场调节。本文对这一办法进行了可行性分析,并列出超产气议价的幅度的计算方法,供决策参考。     

Collective Organization Behaviors of Multi-Cell Systems Induced by Engineered ECM-Cell Mechanical Coupling

Cells in vivo are surrounded by fibrous extracellular matrix (ECM), which can mediate the propagation of active cellular forces through stressed fiber bundles and regulate various biological processes. However, the mechanisms for multi-cellular organization and collective dynamics induced by cell-ECM mechanical couplings, which are crucial for the development of novel ECM-based biomaterial for cell manipulation and biomechanical applications, remain poorly understood. Herein, the authors design an in vitro quasi-3D experimental system and demonstrate a transition between spreading and aggregating in collective organizational behaviors of discrete multi-cellular systems, induced by engineered ECM-cell mechanical coupling, with the observed phenomena and underlying mechanisms differing fundamentally from those of cell monolayers. During the process of collective cell organization, the collagen substrate undergoes reconstruction into a dense fiber network structure, which is correlated with local cellular density and consistent with observed enhanced cells' motility; and the weakening of fiber bundle formation within the hydrogel reduces cells’ movement. Moreover, cells can respond to the curvature and shape of the original cell population and form different aggregation patterns. These results elucidate important physical factors involved in collective cell organization and provide important references for potential applications of biomaterials in new therapies and tissue engineering.     

A novel contention solution strategy based on priority for optical burst switching networks

A fundamental issue in optical burst switching (OBS) networks is to solve the burst contention for the core node. In this paper, a novel priority-based contention solution strategy for OBS networks is proposed. When the contention occurs, the burst priority is considered firstly, and then the burst segmentation method is used for the low priority bursts in this strategy. Ensuring the integrity of high priority bursts, part of the segmented bursts can be transmitted to the destination node via combining wavelength conversion and optical buffer method. Simulation results show that the proposed scheme not only ensures the integrity of high priority bursts, but also reduces the packet loss rate of the low priority bursts maximally, so that it can support good quality of service (QoS) for the network.