新型细胞自动机规则空间的参数化

细胞自动机在复杂性科学研究中占有重要地位，规则空间的规律性是细胞自动机理论研究的核心问题。本文首次引入沃尔什正交变换，结合计算机实验，提出了刻画细胞自动机规则空间规律性的δ参数。通过对所有初等细胞自动机的分析，并与朗顿λ参数的对比研究，结果表明该参数能更好地刻画细胞自动机规则空间中从有序到混沌的相变，不存在关于相变临界值的争论。     

基于曲波变换的图像融合方法

本文在研究了曲波变换的特性后,提出了一种基于曲波变换的图像融合方法,并分别将由不同传感器获得的不同分辨率的遥感图像和医学图像利用此方法进行了融合.这种方法不仅能够完好地显示了源图像各自的信息,而且能很好地将源图像的细节融合在一起.实验结果表明采用这种方法可以得到更好的融合效果.     

多孔氧化铝担持NiFe2O4水热解制氢

氢能源作为一种清洁、高效的绿色能源在替代传统化石燃料上被寄予厚望。铁氧体等多价氧化物水热解制氢是利用太阳光热绿色制氢的主要途径之一,目前的主要问题是热循环过程中氧化物的烧结引起的比表面积减少导致制氢能力下降,因此循环寿命不长。为了延长循环寿命,尝试将镍铁氧体担持于多孔氧化铝陶瓷上以抑制其烧结。研究发现:多孔氧化铝陶瓷担持的铁氧体,其烧结现象明显缓解,循环寿命有所提高。通过比较多孔氧化铝担持镍铁氧体与氧化锆掺杂镍铁氧体在不同温度下的制氢能力及循环次数,发现在1 250℃时多孔氧化铝陶瓷担持镍铁氧体的循环寿命有明显提高,制氢能力与循环寿命的综合性能最佳。     

Study of the spectrum effect on the threshold of resonant magnetic perturbation penetration on J-TEXT

The spectrum effect on the penetration of resonant magnetic perturbation (RMP) is studied with upgraded in-vessel RMP coils on J-TEXT. The poloidal spectrum of the RMP field, especially the amplitudes of 2/1 and 3/1 components, can be varied by the phase difference between the upper and lower coil rows, Δϕ=ϕ_top−ϕ_bottom, where ϕ_top and ϕ_bottom are the toroidal phases of the n = 1 field of each coil row. The type of RMP penetration is found to be related to Δϕ, including the RMP penetration of either 2/1 or 3/1 RMP and the successive penetrations of 3/1 RMP followed by the 2/1 RMP. For cases with penetration of only one RMP component, the penetration thresholds measured by the corresponding resonant component are close for various Δ_f. However, the 2/1 RMP penetration threshold is significantly reduced if the 3/1 locked island is formed in advance. The changes in the rotation profile due to 3/1 locked island formation could partially contribute to the reduction of the 2/1 thresholds.     

Towards advanced divertor configurations on the J-TEXT tokamak

Developing advanced magnetic divertor configurations to address the coupling of heat and particle exhaust with impurity control is one of the major challenges currently constraining the further development of fusion research. It has therefore become the focus of extensive attention in recent years. In J-TEXT, several new divertor configurations, including the high-field-side single-null poloidal divertor and the island divertor, as well as their associated fundamental edge divertor plasma physics, have recently been investigated. The purpose of this paper is to briefly summarize the latest progress and achievements in this relevant research field on J-TEXT from the past few years.