The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique...The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique where the Liouville space is briefly expanded with an additional (virtual) space only within ultrashort subintervals. This tremendously reduces the cost of time-consuming calculations. We implement our technique for an example of a charged particle in both harmonic and anharmonic potentials. The temporal evolutions of the probability for the particle being in the ground state are obtained numerically and compared to the analytical solutions. We further discuss the physics insight of this technique based on a thought-experiment. Successive processes intrinsically “hitchhiking” via virtual space in discrete ultrashort time duration, are the hallmark of our technique. We believe that this technique has potential for solving numerous problems which often pose a challenge when using the traditional approach based on time-ordered exponentials.展开更多
目的:分析鉴定实验室自制的功能红曲菌的固态发酵物中的主要莫纳可林类物质。方法:首先通过固态发酵制得功能红曲粉,然后分别使用极性不同的4种溶剂(蒸馏水、乙醇、乙酸乙酯和正己烷)超声提取提取功能红曲粉,再通过减压旋蒸及冷冻干燥...目的:分析鉴定实验室自制的功能红曲菌的固态发酵物中的主要莫纳可林类物质。方法:首先通过固态发酵制得功能红曲粉,然后分别使用极性不同的4种溶剂(蒸馏水、乙醇、乙酸乙酯和正己烷)超声提取提取功能红曲粉,再通过减压旋蒸及冷冻干燥制得提取物粉末。通过UPLC-Q-TOF-MS对功能红曲粉的不同溶剂提取物的化学成分进行定性分析与比较。采用Agilent Eclipse Plus-C18 RRHD色谱柱(2.1 mm x 100 mm,1.8μm),以乙腈-0.1%甲酸水为流动相进行梯度洗脱。质谱分析采用电喷雾正离子全扫描模式采集,扫描范围为m/z 100-1500Da。结论:本文通过UPLC-Q-TOF-MS对功能红曲粉的不同溶剂提取物的化学成分进行定性分析与比较。鉴定出17种主要的莫纳可林类物质。该方法快速、可靠、高效,能较全面地反映功能红曲粉的的提取物中的主要莫纳可林类物质,可为深入研究功能红曲粉中的药效物质提供参考。展开更多
文摘The traditional simulations may occasionally turn out to be challenging for the quantum dynamics, particularly those governed by the nonlinear Hamiltonians. In this work, we introduce a nonstandard iterative technique where the Liouville space is briefly expanded with an additional (virtual) space only within ultrashort subintervals. This tremendously reduces the cost of time-consuming calculations. We implement our technique for an example of a charged particle in both harmonic and anharmonic potentials. The temporal evolutions of the probability for the particle being in the ground state are obtained numerically and compared to the analytical solutions. We further discuss the physics insight of this technique based on a thought-experiment. Successive processes intrinsically “hitchhiking” via virtual space in discrete ultrashort time duration, are the hallmark of our technique. We believe that this technique has potential for solving numerous problems which often pose a challenge when using the traditional approach based on time-ordered exponentials.
基金Supported by National Natural Science Foundation of China (11871258)the Young Backbone Teachers in Henan Province (2020GGJS194)the Young Backbone Teachers in Luoyang Normal College (2019XJGGJS-10)。
文摘目的:分析鉴定实验室自制的功能红曲菌的固态发酵物中的主要莫纳可林类物质。方法:首先通过固态发酵制得功能红曲粉,然后分别使用极性不同的4种溶剂(蒸馏水、乙醇、乙酸乙酯和正己烷)超声提取提取功能红曲粉,再通过减压旋蒸及冷冻干燥制得提取物粉末。通过UPLC-Q-TOF-MS对功能红曲粉的不同溶剂提取物的化学成分进行定性分析与比较。采用Agilent Eclipse Plus-C18 RRHD色谱柱(2.1 mm x 100 mm,1.8μm),以乙腈-0.1%甲酸水为流动相进行梯度洗脱。质谱分析采用电喷雾正离子全扫描模式采集,扫描范围为m/z 100-1500Da。结论:本文通过UPLC-Q-TOF-MS对功能红曲粉的不同溶剂提取物的化学成分进行定性分析与比较。鉴定出17种主要的莫纳可林类物质。该方法快速、可靠、高效,能较全面地反映功能红曲粉的的提取物中的主要莫纳可林类物质,可为深入研究功能红曲粉中的药效物质提供参考。
