Generalized Lanczos method for systematic optimization of tensor network states

We propose a generalized Lanczos method to generate the many-body basis states of quantum lattice models using tensor-network states(TNS). The ground-state wave function is represented as a linear superposition composed from a set of TNS generated by Lanczos iteration. This method improves significantly the accuracy of the tensor-network algorithm and provides an effective way to enlarge the maximal bond dimension of TNS. The ground state such obtained contains significantly more entanglement than each individual TNS, reproducing correctly the logarithmic size dependence of the entanglement entropy in a critical system. The method can be generalized to non-Hamiltonian systems and to the calculation of low-lying excited states, dynamical correlation functions, and other physical properties of strongly correlated systems.     

整装勘查区铜铅锌矿现场快速分析技术的发展现状及思考

通过总结现场分析的现状及发展历程,针对现场分析样品的制备,分析方法及仪器在野外现场的应用条件、影响因素,提出应对措施,发展思路及建议,通过提供可靠的检测数据,充分满足野外地质工作的需要.     

一次性纸杯中浸出无机元素分析

就人们经常使用的纸杯在不同温度下浸泡出的无机元素用ICP-OES进行测试,各种元素的加标回收率在9S％-10S％,检出限达到1μg/L.     

泡塑富集-石墨炉原子吸收光谱法测定地质样品中微量铊

采用HF-HClO4-HNO3溶解样品,泡沫塑料富集-石墨炉原子吸收光谱法测定岩石、土壤、水系沉积物等地质样品中微量铊。以抗坏血酸为基体改进剂,Fe3+加入量选择200mg,灰化温度为600℃,原子化温度为1600℃。方法用于测定国家一级标准物质,结果与标准值基本一致。方法精密度(RSD,n=8)为2.73%—3.93%,回收率为96.7%—101.3%,检出限可达0.060μg/g。