福建省旅游景区系统空间结构特征与优化研究——基于分形理论视角

运用分形理论对福建旅游景区系统空间结构进行研究。聚集维数分析表明,该系统是分形的,处于有限扩散集团凝聚模型演化的中期阶段,空间集聚模式与自组织演化以向心化为主;各子系统发育成熟度不一,表现为:闽东北>闽南>闽西北>闽西南。区系统自组织优化还未完全形成,大部分旅游景区以沿海各大城市为中心呈团状分布于交通干线附近,西北与西南部、东部沿海同类旅游景区密集分布,屏蔽效应显著,全省交通网络通达性一般。当前福建旅游景区系统空间结构的优化需要解决旅游中心地培育与优化,降低旅游屏蔽与完善旅游空间网络体系问题。

Reservoir detection based on EMD and correlation dimension

In hydrocarbon reservoirs, seismic waveforms become complex and the correlation dimension becomes smaller. Seismic waves are signals with a definite frequency bandwidth and the waveform is affected by all the frequency components in the band. The results will not define the reservoir well if we calculate correlation dimension directly. In this paper, we present a method that integrates empirical mode decomposition （EMD） and correlation dimension. EMD is used to decompose the seismic waves and calculate the correlation dimension of every intrinsic mode function （IMF） component of the decomposed wave. Comparing the results with reservoirs identified by known wells, the most effective IMF is chosen and used to predict the reservoir. The method is applied in the Triassic Zhongyou group in the XX area of the Tahe oil field with quite good results.

Path Integral Liouville Dynamics Simulations of Vibrational Spectra of Formaldehyde and Hydrogen Peroxide

Formaldehyde and hydrogen peroxide are two important realistic molecules in atmospheric chemistry.We implement path integral Liouville dynamics(PILD)to calculate the dipolederivative autocorrelation function for obtaining the infrared spectrum.In comparison to exact vibrational frequencies,PILD faithfully captures most nuclear quantum effects in vibrational dynamics as temperature changes and as the isotopic substitution occurs.

人体心脏脉动的混沌动力学研究

目的和方法采用混沌动力学方法，对冠心病３０例和正常对照组３０例的心率时间序列功率谱和关联维数等三个方面作了对比研究。结果心脏健康者的心率变化表现出明显的游走性，其功率谱和相空间吸引子明显呈现混沌特性，奇怪吸引子呈现复杂结构，关联维数Ｄｎ＞４。而心脏病患者的心率呈现出明显的周期性，其功率谱主要集中在０～０．１Ｈｚ的窄带范围，相空间轨迹不存在饱和的关联维数。结论上述结果为分析心率变化提供了反映动力学特性的量化指标。心脏病患者与正常人的心率变化特征有本质区别。