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相态可控硒化铜纳米粒子的超声合成
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作者 赵淑贤 杜虹 《新疆师范大学学报(自然科学版)》 2012年第4期24-27,95,共5页
在水体系中,在超声辐射条件下合成了一系列的硒化铜纳米粒子,包括Cu3Se2、Cu2-XSe和CuSe以及它们的掺杂态,通过改变反应物的配比以及在反应添加不同的配体可以有效控制合成的纳米粒子的相态和尺寸。合成样品的相态、形态尺寸通过XRD和TE... 在水体系中,在超声辐射条件下合成了一系列的硒化铜纳米粒子,包括Cu3Se2、Cu2-XSe和CuSe以及它们的掺杂态,通过改变反应物的配比以及在反应添加不同的配体可以有效控制合成的纳米粒子的相态和尺寸。合成样品的相态、形态尺寸通过XRD和TEM等技术进行了表征。 展开更多
关键词 硒化铜 超声 相态可控 纳米粒子
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ON COMPLEX DYNAMIC CONTROL SYSTEMS
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作者 CHENG Daizhan (Institute of Systems Science, Chinese Academy of Sciences, Beijing 100080, China) 《Journal of Systems Science & Complexity》 SCIE EI CSCD 2003年第3期350-357,共8页
This paper presents some recent works on the control of dynamic systems,which have certain complex properties caused by singularity of the nonlinear structures,structure^varyings, or evolution process etc. First, we c... This paper presents some recent works on the control of dynamic systems,which have certain complex properties caused by singularity of the nonlinear structures,structure^varyings, or evolution process etc. First, we consider the structure singularity of nonlinear control systems. It was revealed that the focus of researches on nonlinear control theory is shifting from regular systems to singular systems. The singularity of nonlinear systems causes certain complexity. Secondly, the switched systems are considered. For such systems the complexity is caused by the structure varying. We show that the switched systems have significant characteristics of complex systems. Finally, we investigate the evolution systems. The evolution structure makes complexity, and itself is a proper model for complex systems. 展开更多
关键词 relative degree byrnes-isidori normal form center manifold switchedsystems evolution system
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