Chirality on Hierarchical Self‐Assembly of Au@AuAg Yolk–Shell Nanorods into Core–Satellite Superstructures for Biosensing in Human Cells

Here, Au@AgAu yolk–shell nanorods (YSNRs) with tunable plasmonic circular dichroism (PCD) responses are synthesized, for the first time, using chiral d ‐ or l ‐penicillamine. The concentration of chiral molecules and the nanogap size play key roles in the PCD signal of the YSNRs. Importantly, the PCD response could be regulated by changing the aspect ratio of gold nanorods, and the largest anisotropy factor (<i>g</i>‐factor) is 0.009. Remarkably, the YSNRs are used as new chiroptical building blocks together with Au nanoparticles (NPs) to build YSNR@NP core–satellite (CS) assemblies, which display much stronger PCD intensity and an increased <i>g</i>‐factor of 0.021. The theoretical calculation data demonstrate that the significant PCD activity of nanoassemblies is originated from chiral structures and the intrinsic chirality of the building blocks. Noticeably, the developed CS superstructures with photothermal effects are utilized to quantitatively detect zinc ion in living cell lines. This study reports an emerging class of chiral inorganic nanostructures with important future applications, including enantioselective separation, asymmetric catalysis, and biomedical sensing.     

球面l1-正则化逼近模型及其应用研究

基于不同的正则化算子的选取,建立了一类球面上带[l1]-正则项最小二乘逼近模型。通过选取好条件的球面[t]-设计点作为采样点,展示了求解此逼近问题的算法。最后,通过数值例子展现了满意的逼近效果—精确数据和噪声污染的情形。     

Decentralized networked control of discrete‐time systems with local networks

This paper considers discrete‐time large‐scale networked control systems with multiple local communication networks connecting sensors, controllers, and actuators. The local networks operate asynchronously and independently of each other in the presence of variable sampling intervals, transmission delays, and scheduling protocols (from sensors to controllers). The time‐delay approach that was recently suggested to decentralized stabilization of large‐scale networked systems in the continuous time is extended to <img alt="urn:x-wiley:rnc:media:rnc3862:rnc3862-math-0001" class="section_image" src="//wol-prod-cdn.literatumonline.com/cms/attachment/103a525c-31d1-4adf-a191-c071b5a28cd9/rnc3862-math-0001.png"> decentralized control in the discrete time. An appropriate Lyapunov‐Krasovskii method is presented that leads to efficient LMI conditions for the exponential stability and <i>l</i><sub>2</sub>‐gain analysis of the closed loop large‐scale system. Differences from the continuous‐time results are discussed. A numerical example of decentralized control of 2 coupled cart‐pendulum systems illustrates the efficiency of the results.     

防空武器系统射击方案研究

利用排队论思想对同类防空导弹武器系统的几种射击方案进行了分析计算，讨论了各种射击方案的正确使用条件。     

Tensile Deformation of Iron Oxides at 600–1250°C

Tensile tests of virtually <img src="/content/jj0l4lmh462q9562/xxlarge8220.gif" alt="ldquo" align="MIDDLE" BORDER="0">pure<img src="/content/jj0l4lmh462q9562/xxlarge8221.gif" alt="rdquo" align="MIDDLE" BORDER="0"> FeO, <img src="/content/jj0l4lmh462q9562/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0"> -Fe<sub>3</sub>O<sub>4</sub>, and <img src="/content/jj0l4lmh462q9562/xxlarge945.gif" alt="agr" align="BASELINE" BORDER="0">-Fe<sub>2</sub>O<sub>3</sub> were performed at 600–1250°C at strain rates of 2.0×10<sup>–3</sup>–6.7×10<sup>–5</sup> s<sup>–1</sup> under controlled gas atmospheres. Mechanical properties and deformation/fracture behavior were investigated. For <img src="/content/jj0l4lmh462q9562/xxlarge945.gif" alt="agr" align="BASELINE" BORDER="0">-Fe<sub>2</sub>O<sub>3</sub>, brittle fracture resulted at 1150–1250°C and the fracture strain was below 4.0% at a strain rate of 2.0×10<sup>–4</sup> s<sup>–1</sup>. <img src="/content/jj0l4lmh462q9562/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0"> -Fe<sub>3</sub>O<sub>4</sub> deformed plastically above 800°C. Steady-state deformation was indicated at 1200°C; elongation of 110% was obtained. Plastic deformation observed at 800 to 1100°C was considered to result from dislocation glide. Using TEM, the Burgers vector of dislocations observed in deformed <img src="/content/jj0l4lmh462q9562/xxlarge947.gif" alt="gamma" align="MIDDLE" BORDER="0"> -Fe<sub>3</sub>O<sub>4</sub> was determined to be <110>, its slip system was estimated to be {111}<110>. FeO deformed plastically above 700°C. Steady-state deformation became predominant above 1000°C. Elongation of 160% was obtained at 1200°C. Strain rates of FeO at 1000°C and 1200°C were proportional to the fourth power of the saturated stress, indicating that plastic deformation was affected by dislocation climb.     

小波变换在机械系统非线性信号消噪中的应用

噪声的去除一直是信号处理中较为关键的技术之一。小波变换在时、频两域都具有表征信号局部特征的能力，突破了传统Fourier分析的局限性，很适合检测信号的奇异现像。用Daubechies小波和Fourier变换分别对洛仑兹混沌信号以及撞击流反应器压力波动非线性信号进行去噪分析，结果表明，二者的去噪效果有较大的不同，突出了小波变换用于非线性信号去噪的性能。因而，将小波用于信号消噪具有重要的意义。     

机械传动方案设计的模糊综合评判法

针对机器设计中的诸多模糊因素，综合应用专家评分法和模糊综合评判法建立方案评价模型，基于该模型，应用Criterium^R DecisionPlus系统对某巷道中工作的带式运输机的三种设计方案进行评价。     

U-Cell拓扑并网逆变器的MPC策略

针对七电平U-Cell拓扑并网逆变器的优化控制问题,设计了模型预测控制(MPC)策略。不同于传统并网逆变器系统,新型基于U-Cell拓扑的并网逆变器具有一个独立直流源和一组电容作为辅助直流回路,故能实现多目标控制的MPC方案应用于此具有明显优势,其通过对辅助电容电压的控制可实现七电平电压输出,同时控制逆变器在并网点提供所需的有功和无功功率,并保证电能质量。利用U-Cell拓扑逆变器样机进行了相关实验,实验结果表明,在直流电压、功率变化和功率因数变化下,系统均具有快速且准确的动态响应。     

生物基阻燃剂阻燃聚乳酸的研究进展

针对生物基阻燃剂在绿色阻燃聚乳酸（PLA）领域的应用,简要介绍了生物基阻燃剂的阻燃改性技术,重点分析和综述了近5年含纤维素、木质素、壳聚糖、植酸、环糊精以及淀粉等生物基阻燃剂阻燃PLA的研究进展。最后,指出目前生物基阻燃剂应用和发展存在的问题,并对生物基阻燃剂在PLA阻燃领域发展的趋势进行了展望。