111 resultados para Lou Reed
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
In this paper, we propose a method for forming steady patterns of microparticles in a dispersion using optical tweezers. We demonstrate how to control the congregation of particles in a dispersion and to manually fabricate a pattern, The steady pattern (nay be useful for in-depth research, and the method will have applications in biology and nanotechnology.
Resumo:
We present an improved procedure on the approach to determine the stability of polystyrene spheres at microscopic particle levels by means of artificially induced particle collisions with the aid of optical tweezers [J.Chem.Phys. 119, 2399(2003)]. The basic consideration on this new development is that the major contribution to the sticking probability for a particle pair caught into the optical trap for a short period is from its single collision; therefore, if the trapping duration for the pair is taken to be short, the accumulated sticking probability will be a good approximation for the single collision. The experimental procedure associated with this approximation does not resort to exactly controlling the short trapping duration or request the trapping duration correction as previously reported and therefore it is more practical and applicable for broader range of the stability ratio. The experimental results under different electrolyte concentrations by the new procedure are consistent with those from the turbidity measurements.
Resumo:
用量纲分析方法分析了动脉脉冲血流线性理论的基础.结论是:1.目前流行的线化条件不适于动脉血流.正确的线化条件应为,或.据此,线性理论适于中等动脉;对主动脉,用以分析压力一流量关系及脉冲波传播特性尚可,不能用来求速度分布.这和实验研究的结论吻合.2.与流动迁移惯性力相比,压力径向梯度的作用是次要的.故在线化条件下考虑径向压力梯度的影响是不必要的.最后用Lou的有限幅度位移模型和最简流动方程给出了解,所得波速公式和计及时一样。
Resumo:
分析了RS（Reed-Solomon）纠错码和网格编码调制（Trellis Coded Modulation，TCM）技术在光脉冲位置调制通信中的应用．在此基础上，提出了以RS码作为外码，以网格编码调制技术作为内码，用于光脉冲位置调制通信的新编码方案，能以几乎不减少通信速率的优势，提高传统RS码系统在时变带限光信道中的通信性能．模拟研究了在不同空间光信道条件下，传统RS码的符号正确传输率和误码率，并对网格编码调制的编码增益、RS码与网格编码调制级联时的编码增益进行了仿真研究，证实了本方案的有效性．
