排序方式: 共有39条查询结果,搜索用时 31 毫秒
1.
模拟退火法在吸收薄膜的椭偏反演算法中的应用 总被引:18,自引:4,他引:14
将一种广泛用于求解复杂系统优化问题的技术--模拟退火法--用来求解椭偏反演方程。首先假设一个薄膜模型,计算出其相应的椭偏参数(Ψ,Δ)的值,在这个计算值的基础上加入不同标准偏差的高斯噪声;然后将加入噪声后的值(Ψm,Δm)作为模拟的测量数据,采用模拟退火算法进行求解,验证得知这种方法求得的薄膜参数很接近于假设的薄膜模型参数的真值,与其他文献的报道结果一致,而且在扩大搜寻范围时,仍然可以得到准确解,从而证明了该方法的可行性以及有效性。 相似文献
2.
3.
TheEquivalence ofthePFAandOFAAutomataTheEquivalenceofthePFAandOFAAutomata¥//LiGuocaiandWangChuanhong(DepartmentofMathematics,... 相似文献
4.
Jiang Zhipeng Xie Fan Kang Chuanhong Wang Yanfei Yuan Long Wang Yue 《Journal of Radioanalytical and Nuclear Chemistry》2019,321(3):895-905
Journal of Radioanalytical and Nuclear Chemistry - Poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) microspheres (PZA) was based on hexachlorocyclotriphosphazene (HCCP) and... 相似文献
5.
借助原位液体透射电镜,我们观察并研究了钯纳米棒溶液环境下的氧化刻蚀的微观行为及机理。通过改变钯纳米棒所处的液体环境,有效地控制了钯纳米棒的氧化刻蚀行为。由于端部具有较高的反应活性,钯纳米棒在氯化铁溶液中的氧化刻蚀会选择沿着轴向进行,具有明显的各向异性。当反应在超薄液层进行时,钯纳米棒的氧化刻蚀会变为准各向同性。这种行为是由于超薄溶液中溶解产物以及氧化物的扩散被抑制,在纳米棒端部选择性发生的氧化刻蚀会受到阻碍。最后,我们发现在钯纳米棒端部选择性沉积金,可以保护纳米棒的端部不受氧化,从而能控制刻蚀沿着钯纳米棒的径向进行。本文的研究结果对贵金属纳米晶的结构参数的精确调控以利于实际应用具有重要的意义。 相似文献
6.
The left- and right-handed chiral Schwinger models are re-examined by a modified chiral bosonization. Contrary to the usual chiral bosonization, we impose the chiral constraint on the right-handed chiral Schwinger model and the antichiral constraint on the left-handed one. The resulting chiral boson and theories are gauge-invariant and equivalent to one (free) cbiral boson and one antichiral boson respectively. 相似文献
7.
8.
Ji Guo Qing Chang Zhiwei Liu Yangming Wang Chuanhong Liu Mou Wang Danmeng Huang Guanying Chen Hongmei Zhao Wei Wang Xikui Fang 《Chemical science》2021,12(21):7361
Introducing functionalities into the interior of metal–organic cage complexes can confer properties and utilities (e.g. catalysis, separation, drug delivery, and guest recognition) that are distinct from those of unfunctionalized cages. Endohedral functionalization of such cage molecules, for decades, has largely relied on modifying their organic linkers to covalently append targeted functional groups to the interior surface. We herein introduce an effective coordination method to bring in functionalities at the metal sites instead, for a set of polyhedral cages where the nodes are in situ formed polyoxovanadate clusters, [VIV6O6(OCH3)9(μ6-SO4)(COO)3]2−. Replacing the central sulfates of these hexavanadate clusters with more strongly coordinating phosphonate groups allows the installation of functionalities within the cage cavities. Organophosphonates with phenyl, biphenyl, and terphenyl tails were examined for internalization. Depending on the size/shape of the cavities, small phosphonates can fit into the molecular containers whereas larger ones inhibit or transform the framework architecture, whereby the first non-cage complex was isolated from a reaction that otherwise would lead to entropically favored regular polyhedra cages. The results highlight the complex and dynamic nature of the self-assembly process involving polyoxometalates and the scope of molecular variety accessible by the introduction of endo functional groups.Installation of oversized functions within a metal–organic cage may “burst” or even transform the molecular cage itself. 相似文献
9.
10.
潘传红 《核聚变与等离子体物理》1987,(2)
为了便于做数值分析,需要将气球模方程表示成磁面量形式。考虑圆形磁面情形,并假定磁面位移(Shafranov位移)△为小量,如图1,图中ζ为环向角. R=R_0+△+rcosθ =rsinθ。其中r为磁面横截面半 θ为极向角,由平衡理论可知 相似文献