Relation of chaos activity characteristics of the cardiac system with the evolution of species

According to the nonlinear theory, the experiments have been conducted on sample ECG (electrocardiogram) signals of healthy human beings, coronary heart disease patients and adult canines. On the basis of the analyses of the power spectra, the computation of the correlation dimension and the Lyapunov exponent to a large number of ECG signals, the following conclusions are shown: through the comparative research, (1( the analyses of the power spectra, the computation of the correlation dimension and the Lyapunov exponent to the ECG signals reflect the whole dynamic characteristics of the hearts, and they may become a new method of researching ECG quantitatively to an early diagnose of heart disease. (2( Under normal physiological conditions the cardiac activities are chaotic, while under pathologic conditions the cardiac activities approach regularity. (3( On the basis of the comparative research of human beings and canines, it is revealed that chaos may be a quantitative index to measure the evolution of species. This conclusion would supply a new cut-in point to elaborate the Darwin theory, and it would enable us to explain the life theory renewably using the basic principle of nonlinear theory.     

Dissociation of methanol in intense femtosecond laser field

Methanol was irradiated by 80 fs laser pulse, intensity range of 10¹³–10¹⁴ W/cm². A TOF-mass spectrometer was coupled to the laser system and used to detect the ions produced. The parent ions CH₃OH⁺ appeared firstly at the laser intensity of 1.4×10¹³ W/cm². While the laser intensity was gradually increased, the parent ions were dissociated and the primary ions CH₂OH⁺ were given as verified from the irradiation of deuterated methanol (CH₃OD) showing the C—H bond cracking firstly. While the laser intensity was further increased to 2.0 × 10¹³ W/cm², the C—O bonds of the parent ions also broke to give CH₃ ⁺. When the laser intensity was higher, smaller fragment ions like CH⁺, C⁺, OH⁺ and O⁺ also appeared. Among the fragment ions, only H⁺ ion yield had anisotropic angular distribution dependence on the laser polarization vector in the dissociation of methanol. All the experimental observations show that the dissociation of methanol proceeds through stepwise mechanism but not Coulomb explosion.     

敏化离子Yb3+对Er3+:Yb3+:YCa4O(BO3)3晶体光谱参数的影响

通过对Er^3 单掺和Er^3 、Yb^3 双掺YCa4O(BO3)3（简称为Er:YCOB和Er:YYCOB）室温吸收谱的测量和计算，发现Yb^3 的敏化作用十分显著，以至于Judd-Ofelt(JO)理论的传统算法不能奏效。本文用数值法和联立法求解了全部JO参数，计算了能量转移的量值。JO参数表明，Er:YYCOB在InCaAs二级管激光泵浦下，有望产生1500nm左右的红外激光输出。而Er:YCOB，由于Er^3 离子在此波长附近的重复吸收损耗较大，红外激光输出的可能性很小。     

Me2SnCl2与脱铁伴清蛋白作用的紫外差光谱研究

在 4mm ol/ L Na H2 PO4- 10 0 mm ol/ L Na Cl- 2 5 mm ol/ L Na HCO3 缓冲溶液 (p H=7.4)和 2 98K条件下 ,用紫外差光谱研究了 Me2 Sn Cl2 与脱铁伴清蛋白的作用。结果表明 Me2 Sn Cl2 与脱铁伴清蛋白形成 2∶ 1的配合物 ,其结合常数用作图法求得为 7.83× 10 4L/ mol     

人工神经网络用于红外光谱定性分散染料

根据分散染料的红外光谱图，用人工神经网络直接建立红外光谱数据库，以化合物编号直接作为人工神经网络的输出对网络进行训练，训练后的人工神经网络可对属于训练范围内的分散染料进行定性。     

用分光光度法测定弱电解质的解离常数——Ⅱ 溴酚蓝+氯化钠+乙醇+水体系

本文用分光光度法,测定了在恒定不同离子强度下,混合溶剂中溴酚蓝的具有等级收点的吸收谱图。利用外推法和多项式拟合法,确定了溴酚蓝的热力学解离常数K~o,两种方法所得结果在实验误差范围内基本一致。本文还讨论了混合溶剂对溴酚蓝吸收谱图的影响。     

2—(2''''—对硝基苯基)乙烯基—5—联苯基(口恶)唑的合成及荧光活化现象

通过2—甲基—5—联苯(口恶)唑与对硝基苯甲醛缩合,合成了新的化合物2—(2′一对硝基苯基)乙烯基—5—联苯基(口恶)唑[1],并对此化合物的荧光光谱进行研究,发现在只有微弱荧光的2—(2′一对硝基苯基)乙烯基—5—联苯基(口恶)唑的溶液中加入没有荧光的三正丁胺后,产生很强的荧光.亲核的三正丁胺与2—(2′一对硝基苯基)乙烯基—5—联苯基(口恶)唑形成异络激发体,三正丁胺的孤对电子与硝基反键轨道重新组合,得到新的反键轨道,因而使分子内电荷迁移受到削弱这样就产生荧光。     

四（对硝基苯）卟啉对二甲基甲酰胺的CARS信号增强效应

首次发现二甲基甲酰胺(DMF)溶液在添加适量的四(对硝基苯)卟啉(PNNNN)后,其865cm~(-1)处的Raman振动模所对应的CARS(相干反斯托克斯喇曼散射)光谱信号有明显的增强效应.从实验和理论两方面探讨了添加剂浓度变化对这种光谱信号增强效应的影响,并在四波混频理论的基础上,对上述增强效应的产生机理做了较细致的定性分析。     

C_(60):一种新型的碳素

C_(60)分子的六十个碳原子,组成一个削顶的二十面体,每个碳原子就分布在其顶点上。C_(60)分子又构成了二种晶格类型即立方面心(FCC)和六方密堆积(HCP)结构,生产C_(60)有二种方法:即激光蒸发石墨和直流电弧接触石墨,它们广泛地被用于材料的制备和天文物理研究。