基于DNAzyme的自驱动DNA分子机器检测有机磷农药

通过范德华力作用,将脱氧核酶(DNAzyme)和6-羧基荧光素(FAM)标记的底物链共修饰的金纳米粒子(AuNPs)负载于MnO2纳米片上,构建了一种自驱动DNA分子机器.乙酰胆碱酯酶(AChE)将其底物乙酰硫代胆碱(ATCh)转化为硫代胆碱(TCh)后,MnO2纳米片被降解为Mn2+,激活DNAzyme切割底物链的循...     

结构偏差对保偏光子晶体光纤色散特性的影响

光子晶体光纤(PCF)具有很多特殊性质,这些性质强烈依赖其具体结构.由于光子晶体光纤制作过程复杂,容易造成各种变形,包括包层气孔的位置偏移或变形等,从而明显影响该光子晶体光纤的性能.选用商品保偏单模光子晶体光纤作为研究对象,改变了环绕中心石英芯的两个大空气孔之一的形状和尺寸.固定气孔尺寸和形状,改变其位置;再固定其位置,改变一个大气孔的直径;最后同时改变二者,分析其交叉影响.仿真结果显示当一个气孔变形或偏移后,光子晶体光纤的等效折射率、零色散波长、偏振拍长、导模模场形状等参数均发生变化,说明结构偏差对保偏光子晶体光纤性质有明显影响.     

Cryo-EM Data Statistics and Theoretical Analysis of KaiC Hexamer

Cryo-electron microscopy(cryo-EM) provides a powerful tool to resolve the structure of biological macromolecules in natural state. One advantage of cryo-EM technology is that different conformation states of a protein complex structure can be simultaneously built, and the distribution of different states can be measured. This provides a tool to push cryo-EM technology beyond just to resolve protein structures, but to obtain the thermodynamic properties of protein machines. Here, we used a deep m...     

场协同理论在脉管制冷机研究中的推广

本文采用理论分析和数值计算的方法,确认由过增元教授等提出的强化换热的场协同理论同样可以应用到能量转换过程。文中用场协同理论揭示了脉管制冷机发展过程中几次重大改进的实质,并以此理论指导改进脉管制冷机的结构参数,发现了脉管的最佳长径比。     

G—M制冷机穿梭传热损失的数值计算与分析

1引言G－M制冷机自50年代末发明以来[1]，由于其结构新颖、工作可靠、寿命长，已在军工和民用部门得到广泛应用。尤其是近些年，由于新型磁性蓄冷材料的发现，随之液氦温区G－M制冷机的研制成功，更加扩大了G－M制冷机的应用前景，使得G－M制冷机的研究再次引起各国高技术领域的极大兴趣。我国液氦温区G－M制冷机的研究已隶属于国家高技术“863”计划。G－M制冷机的工作原理参见[1]。所谓穿梭传热损失是指由于制冷机的排出器（活塞）在汽缸内作往复运动，造成排出器上各点与气缸对应点之间有温差，从而热量由热端传至冷端形成的冷量损…     

Additive Temporal Coloured Noise Induced Eckhaus Instability in Complex Ginzburg-Landau Equation System

The effect of additive coloured noises, which are correlated in time, on one-dimensional travelling waves in the complex Ginzburg-Landau equation is studied by numerical simulations. We found that a small coloured noise with temporal correlation could considerably influence the stability of one-dimensional wave trains. There exists an optimal temporal correlation of noise where travelling waves are the most vulnerable. To elucidate the phenomena, we statistically calculated the convective velocities Vg of the wave packets, and found that the coloured noise with an appropriate temporal correlation can decrease Vg, making the system convectively more unstable.     

Responses of a Noisy Excitable System to External Signals with Different Periods

The behaviour of an excitable system under Gaussian white noise and external periodic forcing is systematically studied. In a large range of noise intensity, the n:l phase locking patterns are obtained for certain ranges of the input periods, where n input periods give one spike. In the phase locking regimes, the system presents low noise-to-signal ratios and shows better regularities. Out of the regimes the system behaves less regularly and the relations between the noise-to-signal ratio and the noise intensity exhibit typical stochastic resonance phenomena.At a higher noise level, the system shows the characteristic behaviour of the noise.     

节理表面波纹度对其闭合性质的影响

节理的表面形貌中普遍含有波纹度。本文分析了含波纹度节理闭合模型的性质，探讨了其接触变形机理，研究了波纹度幅值、频率及不规则度方差对节理闭合性质的效应，最后与将波纹度分量作为随机分量处理的以往的节理闭合模型进行了比较。     

无锡国际马拉松赛电视转播方案

本文简述了无锡国际马拉松赛的背景资料.重点就本次马拉松赛的电视转播方案进行了阐述.其中涉及到转播方案的模块组成、各模块之间的连接方式以及分别承担的作用.并就转播中的一些实际感受谈了谈自己的想法.主要涉及前期赛道准备的意义、EFP系统核心设备的选择及在该次转播中的使用方法,并对大型转播中各种传输方式的选择以及注意点阐述了自己的观点.