To expose the statistical properties of the degenerated spectrum, with the aid of the random matrix theory, a possible form of the NNS distribution function of the degenerate spectrum was proposed by providing a solut...To expose the statistical properties of the degenerated spectrum, with the aid of the random matrix theory, a possible form of the NNS distribution function of the degenerate spectrum was proposed by providing a solution in terms of the same-degeneracy case. The results indicate that the target spectrum is transformed into two sub-spectra： a random one and a regular one, and that the repulsion level of the regular spectrum is also decreased.展开更多
Based on the concept of the energy level repulsion, a potential function followed by the energy level particles is suggested. By regarding the energy level fluctuation spectrum as a dynamic system which consists of th...Based on the concept of the energy level repulsion, a potential function followed by the energy level particles is suggested. By regarding the energy level fluctuation spectrum as a dynamic system which consists of the pairs of energy level particles behaving as the generalized harmonic oscillator, a generalized Schrdinger equation valid for the nearest neighbor space (NNS) distribution of the levels is established. It turns out that the different kinds of NNS distributions found so far are the solutions of this equation: Both the Poisson type and Wigner type are its eigen solutions whereas the Gaussian unitary ensemble (GUE) type and the Brody type of NNS distribution are its composite solutions. Furthermore, the influences of the small perturbation on the NNS distribution are analyzed.展开更多
To explore atomic-level phenomena in the Cu-Ni-Sn alloy,a second nearest-neighbor modified embedded-atom method(2NN MEAM)potential has been developed for the Cu-Ni-Sn system,building upon the work of other researchers...To explore atomic-level phenomena in the Cu-Ni-Sn alloy,a second nearest-neighbor modified embedded-atom method(2NN MEAM)potential has been developed for the Cu-Ni-Sn system,building upon the work of other researchers.This potential demonstrates remarkable accuracy in predicting the lattice constant,with a relative error of less than 0.5%when compared to density functional theory(DFT)results,and it achieves a 10%relative error in the enthalpy of formation compared to experimental data,marking substantial advancements over prior models.The bulk modulus is predicted with a relative error of 8%compared to DFT.Notably,the potential effectively simulates the processes of melting and solidification of Cu-15Ni-8Sn,with a simulated melting point that closely aligns with the experimental value,within a 7.5%margin.This serves as a foundation for establishing a 2NN MEAM potential for a flawless Cu-Ni-Sn system and its microalloying systems.展开更多
目的探讨两种干预方法缓解早产儿眼底筛查所致疼痛的效果。方法纳入2017年7月~2019年6月某三级甲等专科医院早产儿病房进行眼底筛查的168例早产儿进行研究,依据随机对照原则分为三组,各56例,对照组早产儿采取常规眼底筛查,非营养性吸吮(...目的探讨两种干预方法缓解早产儿眼底筛查所致疼痛的效果。方法纳入2017年7月~2019年6月某三级甲等专科医院早产儿病房进行眼底筛查的168例早产儿进行研究,依据随机对照原则分为三组,各56例,对照组早产儿采取常规眼底筛查,非营养性吸吮(NNS)组早产儿接受NNS护理,25%葡萄糖(GS)+NNS组早产儿接受25%GS安慰奶嘴护理。比较三组早产儿不同时间点疼痛、心率(HR)、血氧饱和度(SpO2)变化情况。结果 NNS组与25%GS+NNS组早产儿筛查过程中、筛查后1 min PIPP评分、HR均低于对照组,SpO2均高于对照组,差异显著(P<0.05);GS+NNS组早产儿筛查过程中、筛查后1 min PIPP评分、HR均低于NNS组,SpO2高于NNS组,差异显著(P<0.05)。结论采取25%GS+NNS的干预方式能够有效减轻早产儿眼底筛查所致疼痛,值得临床推荐。展开更多
基金V. ACKN0WLEDGMENT This work was supported by the National Natural Sci- ence Foundation of China （No.10375024） and the Science Foundation of Hunan Educational Committee.
文摘To expose the statistical properties of the degenerated spectrum, with the aid of the random matrix theory, a possible form of the NNS distribution function of the degenerate spectrum was proposed by providing a solution in terms of the same-degeneracy case. The results indicate that the target spectrum is transformed into two sub-spectra： a random one and a regular one, and that the repulsion level of the regular spectrum is also decreased.
文摘Based on the concept of the energy level repulsion, a potential function followed by the energy level particles is suggested. By regarding the energy level fluctuation spectrum as a dynamic system which consists of the pairs of energy level particles behaving as the generalized harmonic oscillator, a generalized Schrdinger equation valid for the nearest neighbor space (NNS) distribution of the levels is established. It turns out that the different kinds of NNS distributions found so far are the solutions of this equation: Both the Poisson type and Wigner type are its eigen solutions whereas the Gaussian unitary ensemble (GUE) type and the Brody type of NNS distribution are its composite solutions. Furthermore, the influences of the small perturbation on the NNS distribution are analyzed.
基金sponsored by the Science and Technology Foundation of Guizhou Provincial Education Department(No.QJJ[2024]60)Guizhou Provincial Basic Research Program(Natural Science)(No.QKHJC[2024]Youth 214)+1 种基金Science and Technology Foundation of Guizhou Minzu University(No.GZMUZK[2024]QD21)Research Projects of Anshun University(No.asxybsjj202413).
文摘To explore atomic-level phenomena in the Cu-Ni-Sn alloy,a second nearest-neighbor modified embedded-atom method(2NN MEAM)potential has been developed for the Cu-Ni-Sn system,building upon the work of other researchers.This potential demonstrates remarkable accuracy in predicting the lattice constant,with a relative error of less than 0.5%when compared to density functional theory(DFT)results,and it achieves a 10%relative error in the enthalpy of formation compared to experimental data,marking substantial advancements over prior models.The bulk modulus is predicted with a relative error of 8%compared to DFT.Notably,the potential effectively simulates the processes of melting and solidification of Cu-15Ni-8Sn,with a simulated melting point that closely aligns with the experimental value,within a 7.5%margin.This serves as a foundation for establishing a 2NN MEAM potential for a flawless Cu-Ni-Sn system and its microalloying systems.
文摘目的探讨两种干预方法缓解早产儿眼底筛查所致疼痛的效果。方法纳入2017年7月~2019年6月某三级甲等专科医院早产儿病房进行眼底筛查的168例早产儿进行研究,依据随机对照原则分为三组,各56例,对照组早产儿采取常规眼底筛查,非营养性吸吮(NNS)组早产儿接受NNS护理,25%葡萄糖(GS)+NNS组早产儿接受25%GS安慰奶嘴护理。比较三组早产儿不同时间点疼痛、心率(HR)、血氧饱和度(SpO2)变化情况。结果 NNS组与25%GS+NNS组早产儿筛查过程中、筛查后1 min PIPP评分、HR均低于对照组,SpO2均高于对照组,差异显著(P<0.05);GS+NNS组早产儿筛查过程中、筛查后1 min PIPP评分、HR均低于NNS组,SpO2高于NNS组,差异显著(P<0.05)。结论采取25%GS+NNS的干预方式能够有效减轻早产儿眼底筛查所致疼痛,值得临床推荐。
