Classical chaotic behavior in diatomic molecules is studied when chaos is driven by a circularly polarized resonant electric field and expanding up to fourth order of approximation the Morse’s potential and angular m...Classical chaotic behavior in diatomic molecules is studied when chaos is driven by a circularly polarized resonant electric field and expanding up to fourth order of approximation the Morse’s potential and angular momentum of the system. On this double resonant system, we find a weak and a strong stationary (or critical) points where the chaotic characteristics are different with respect to the initial conditions of the system. Chaotic behavior around the weak critical point appears at much weaker intensity on the electric field than the electric field needed for the chaotic behavior around the strong critical point. This classical chaotic behavior is determined through Lyapunov exponent, separation of two nearby trajectories, and Fourier transformation of the time evolution of the system. The threshold of the amplitude of the electric field for appearing the chaotic behavior near each critical point is different and is found for several molecules.展开更多
目的探讨精神分裂症患者前额叶、丘脑氢质子磁共振波谱(proton magnetic resonance spectrosco-py,1H-MRS)的特点及其与临床症状的关系。方法本研究纳入7d内未使用抗精神病药物及影响脑内乙酰胆碱神经递质药物的32例精神分裂症患者和36...目的探讨精神分裂症患者前额叶、丘脑氢质子磁共振波谱(proton magnetic resonance spectrosco-py,1H-MRS)的特点及其与临床症状的关系。方法本研究纳入7d内未使用抗精神病药物及影响脑内乙酰胆碱神经递质药物的32例精神分裂症患者和36名正常对照,入组24h内采用多体素1H-MRS检测受试者前额叶和丘脑生化代谢物N-乙酰基天门冬氨酸(NAA)、胆碱复合物(Cho)与肌酸复合物(Cr),并计算NAA/Cr、Cho/Cr和NAA/(Cho+Cr)的比值。患者组同时进行阳性和阴性症状量表(PANSS)评估。结果患者组左侧前额叶及左右侧丘脑NAA/Cr值[分别为(1.30±0.39)、(1.53±0.36)和(1.47±0.35)]均低于对照组[分别为(1.74±0.24)、(1.73±0.25)和(1.74±0.31)],差异具有统计学意义(P<0.05);患者组左侧前额叶NAA/(Cho+Cr)值[(0.63±0.12)]低于对照组[(0.74±0.21)],差异具有统计学意义(P<0.05)。患者组左侧前额叶NAA/Cr值与PANSS总分及阴性症状分呈负相关(r=-0.48,P<0.01;r=-0.54,P<0.01),右侧丘脑NAA/Cr值与阴性症状呈负相关(r=-0.44,P<0.01)。结论精神分裂症患者前额叶及丘脑存在神经元功能和(或)结构异常,左侧前额叶NAA/Cr值可能作为反映精神分裂症患者阴性症状严重程度的参考指标。展开更多
文摘Classical chaotic behavior in diatomic molecules is studied when chaos is driven by a circularly polarized resonant electric field and expanding up to fourth order of approximation the Morse’s potential and angular momentum of the system. On this double resonant system, we find a weak and a strong stationary (or critical) points where the chaotic characteristics are different with respect to the initial conditions of the system. Chaotic behavior around the weak critical point appears at much weaker intensity on the electric field than the electric field needed for the chaotic behavior around the strong critical point. This classical chaotic behavior is determined through Lyapunov exponent, separation of two nearby trajectories, and Fourier transformation of the time evolution of the system. The threshold of the amplitude of the electric field for appearing the chaotic behavior near each critical point is different and is found for several molecules.
文摘目的探讨精神分裂症患者前额叶、丘脑氢质子磁共振波谱(proton magnetic resonance spectrosco-py,1H-MRS)的特点及其与临床症状的关系。方法本研究纳入7d内未使用抗精神病药物及影响脑内乙酰胆碱神经递质药物的32例精神分裂症患者和36名正常对照,入组24h内采用多体素1H-MRS检测受试者前额叶和丘脑生化代谢物N-乙酰基天门冬氨酸(NAA)、胆碱复合物(Cho)与肌酸复合物(Cr),并计算NAA/Cr、Cho/Cr和NAA/(Cho+Cr)的比值。患者组同时进行阳性和阴性症状量表(PANSS)评估。结果患者组左侧前额叶及左右侧丘脑NAA/Cr值[分别为(1.30±0.39)、(1.53±0.36)和(1.47±0.35)]均低于对照组[分别为(1.74±0.24)、(1.73±0.25)和(1.74±0.31)],差异具有统计学意义(P<0.05);患者组左侧前额叶NAA/(Cho+Cr)值[(0.63±0.12)]低于对照组[(0.74±0.21)],差异具有统计学意义(P<0.05)。患者组左侧前额叶NAA/Cr值与PANSS总分及阴性症状分呈负相关(r=-0.48,P<0.01;r=-0.54,P<0.01),右侧丘脑NAA/Cr值与阴性症状呈负相关(r=-0.44,P<0.01)。结论精神分裂症患者前额叶及丘脑存在神经元功能和(或)结构异常,左侧前额叶NAA/Cr值可能作为反映精神分裂症患者阴性症状严重程度的参考指标。
