Multistability and coexisting transient chaos in a simple memcapacitive system

The self-excited attractors and hidden attractors in a memcapacitive system which has three elements are studied in this paper.The critical parameter of stable and unstable states is calculated by identifying the eigenvalues of Jacobian matrix.Besides,complex dynamical behaviors are investigated in the system,such as coexisting attractors,hidden attractors,coexisting bifurcation modes,intermittent chaos,and multistability.From the theoretical analyses and numerical simulations,it is found that there are four different kinds of transient transition behaviors in the memcapacitive system.Finally,field programmable gate array(FPGA)is used to implement the proposed chaotic system.

Controlled Synthesis of Dental Enamel-like Hydroxyapatite Whiskers via Hydrothermal Homogeneous Precipitation

Dental enamel-like hydroxyapatite whiskers with high crystallinity and homogeneous morphology were synthesized by a hydrothermal homogeneous precipitation method. The composition,crystallinity and morphology of prepared hydroxyapatite whiskers were characterized by X-ray diffraction and scanning electron microscopy.The effects of urea and sorbitol on their morphology and composition were investigated. Homogeneous and well crystallized enamel-like hydroxyapatite whiskers with 1. 17± 0. 08 μm in length and 84± 14 nm in width were obtained at 0. 80 mol·L-1urea and 0. 26 mol·L-1sorbitol. These hydroxyapatite whiskers may be close to nature hydroxyapatite dental enamel in terms of the morphology and composition,suggesting that they could have potential application as dental restorative materials in the field of stomatology.

基于小麦条锈菌基因组序列筛选简单重复序列标记（英文）

目的:筛选得到多态性好、扩增稳定的条锈菌微卫星标记,以期更好应用于小麦条锈病菌的群体遗传学研究。创新点:基于条锈菌基因组设计了100对候选简单重复序列(SSR)引物,最终筛选得到20对多态性好并且扩增稳定的微卫星标记。方法:基于条锈菌100个组装序列用Primer 5软件设计了100对SSR引物用于检测来自7个国家的32个菌系,最终筛选得到20对较好的微卫星标记(表2)。结论:基于基因组序列筛选得到的20对微卫星标记将会在小麦条锈菌群体遗传研究中得到广泛应用。