统计平衡状态下扭秤热噪声对引力实验的限制

讨论了统计平衡状态下的耗散涨落理论,由此推导出扭秤的热噪声对引力实验的限制.     

Click polymerization: The aurora of polymer synthetic methodology

As an emerged efficient polymerization methodology, the click polymerization plays a significant role in the area of polymer and materials sciences. Similar to the click reaction, the click polymerization enjoys the advantages of high efficiency, mild reaction conditions, and high regio- and stereo-selectivity etc. In this highlight, we summarize the recent progress on click polymerizations, with focus on the alkyne-based ones. The challenges and opportunities in this area are also briefly discussed. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55, 616–621     

木马防护系统的设计与实现

木马以其隐蔽性强,变化迅速以及窃取文件等手段成为当前网络信息系统面临的安全威胁中危害最为严重的攻击手段之一.文中分析了木马采用的相关技术和传播方式,研究了木马分析与监测的方法与技术,在此基础上设计并实现了一个由基于网络信息流的网关型木马监测预警系统和主机木马检查取证系统组成的木马防护系统.     

40G WDM——下一代光纤传输系统

带宽是满足用户体验的基本保障。逐渐步入主流的3G业务、高宽带业务的带宽需求,给运营商光传输网的建设带来了巨大压力,40G乃至100GWDM技术已成为未来光传输网的必然选择。本文着重介绍了40GWDM的关键技术、设计原则和部署模式。     

Geometric Phase in the Interaction System of Three-Energy Atom with Double-Mode Radiation Field

By using the Lewis–Riesenfeld invariant theory, we have studied the dynamical and the geometric phases in the interaction system of three-energy atom with double-mode radiation field, respectively. The Aharonov–Anandan phase is also obtained under the cyclical evolution.     

Field emission of comb-like chromium disilicide nanowires prepared by an in situ chloride-generated route

Large-area comb-like chromium disilicide (CrSi₂) nanowire film has been successfully synthesized on silicon wafer through an in situ chloride-generated route. The sample possesses branch-like nanowires grown out perpendicularly and evenly from both sides of a stem-like microrod, forming 2-fold comb-like hierarchical nanoarchitectures. The formation mechanism of the sample could be understood by a secondary nucleation process occurring on the surface of the firstly formed CrSi₂ microrod, followed by epitaxial growth of branch-like nanowires under conditions of proper temperature and sufficient vapor supply in the reaction system. The field-emission behavior of the sample shows a low turn-on field of 5.3–6.5 V/μm at anode-sample distances of 200–400 μm, and agrees well with the conventional Fowler–Nordheim theory. No obvious degradation was observed in a life stability experiment period for over 100 min. The relationship between the field enhancement factor and anode-sample distance follows a universal equation, developed within a two-region field-emission model. The convenient and low-cost preparation of the comb-like CrSi₂ nanowires and their remarkable field-emission performance suggest that they can serve as good candidates for field-emission applications.     

单体性质对樟脑醌/胡椒环光引发活性的影响

采用实时红外光谱仪(RT-FTIR)研究了单体结构、单体配比以及活性稀释剂结构对樟脑醌(CQ)/胡椒环(BDO)引发的光聚合动力学的影响,结果发现,UDMA虽然黏度较低,但是易发生链转移反应且在聚合体系中含量较高(70 wt%),可作为氢给体猝灭激发态CQ,从而影响CQ和BDO之间的相互作用.Bis-GMA虽然黏度大,但是反应活性高,当其与少量具有给氢能力的活性稀释剂TEGDMA配合使用时,不仅对聚合体系的反应活性影响较小,而且可显著降低体系的黏度,大大提高自由基的活动能力,有利于改善CQ/BDO的引发活性.     

Privacy-Preserving and Energy-Efficient Continuous Data Aggregation Algorithm in Wireless Sensor Networks

Wireless Personal Communications - Privacy-preserving continuous data aggregation in wireless sensor networks has broad application prospects, such as environmental monitoring, health care, etc....