In this paper, the step reduction method is discussed, which was advanced by Prof. Yeh Kai-yuan for calculating a non-uniform beam with various sections. The following result is proved. The approximate solution by thi...In this paper, the step reduction method is discussed, which was advanced by Prof. Yeh Kai-yuan for calculating a non-uniform beam with various sections. The following result is proved. The approximate solution by this method approaches the true solution if the number of the steps approaches the infinity. However, the measure of the error between the limit solution and the ture solution is not in the pure mathematics sense but in the mechanics sense.展开更多
Quasiclassical trajectory calculation of the title reaction O（^3P）＋H2→OH＋H at three different scattering energies of 0.5, 0.75, and 1.0 eV on the lowest electronic potential energy surface 1^3A＂ has been done. D...Quasiclassical trajectory calculation of the title reaction O（^3P）＋H2→OH＋H at three different scattering energies of 0.5, 0.75, and 1.0 eV on the lowest electronic potential energy surface 1^3A＂ has been done. Distribution P（θr） of polar angles between the relative velocityk of the reactant and rotational angular momentum vector j＇ of the product, distribution P（φr） of the azimuthal as well as dihedral angles correlating k-k＇-j＇, 3-dimensional distri-bution, and polarization-dependent differential cross sections （PDDCSs）dependent upon the scattering angle of the product molecule OH between the relative velocity k of the reactant and k＇ of the product at different scattering energies of 0.5, 0.75, and 1.0 eV are presented and discussed.展开更多
[Objective]This study aimed to provide technical parameters for large-scale production and industrial development of Chlorella vulgaris Beij.[Method]By using 721 visible spectrophotometer,the transmitted light intensi...[Objective]This study aimed to provide technical parameters for large-scale production and industrial development of Chlorella vulgaris Beij.[Method]By using 721 visible spectrophotometer,the transmitted light intensity of different concentrations of C.vulgaris liquid under different wavelengths was measured to normalize the absorbance data,thus determining the optimal wavelength for the growth of C.vulgaris and the concentration of C.vulgaris liquid under the optimal wavelength.The regression equation of absorbance at the optimal wavelength and C.vulgaris concentration was obtained to derive the formula between equivalent concentration C and transmitted light intensity I,thus calculating the equivalent concentration of 0.25-fold C.vulgaris liquid under different transmittance.[Result]The transmitted light intensity of C.vulgaris reached the peak at 670 nm,indicating that 670 nm is the optimal wavelength for measuring C.vulgaris concentration.The regression equation between absorbance and C.vulgaris concentration was y=-1.479 7＋0.987x,with a correlation coefficient of 0.991,suggesting a high correlation between these two factors.The formula of equivalent concentration C and transmitted light intensity I was C=-ln（I/I0）/LK,where L indicates the optical path length（cuvette width）and K indicates the average cross-sectional area of C.vulgaris cells.[Conclusion]It is feasible to investigate indirectly the concentration of C.vulgaris with a spectrophotometer,which can be used to determine the optimal dehydration time of C.vulgaris.展开更多
文摘In this paper, the step reduction method is discussed, which was advanced by Prof. Yeh Kai-yuan for calculating a non-uniform beam with various sections. The following result is proved. The approximate solution by this method approaches the true solution if the number of the steps approaches the infinity. However, the measure of the error between the limit solution and the ture solution is not in the pure mathematics sense but in the mechanics sense.
文摘Quasiclassical trajectory calculation of the title reaction O（^3P）＋H2→OH＋H at three different scattering energies of 0.5, 0.75, and 1.0 eV on the lowest electronic potential energy surface 1^3A＂ has been done. Distribution P（θr） of polar angles between the relative velocityk of the reactant and rotational angular momentum vector j＇ of the product, distribution P（φr） of the azimuthal as well as dihedral angles correlating k-k＇-j＇, 3-dimensional distri-bution, and polarization-dependent differential cross sections （PDDCSs）dependent upon the scattering angle of the product molecule OH between the relative velocity k of the reactant and k＇ of the product at different scattering energies of 0.5, 0.75, and 1.0 eV are presented and discussed.
基金Supported by the Spark Program of Gansu Provincial Science and Technology Department(5HS066-A91-015-01)
文摘[Objective]This study aimed to provide technical parameters for large-scale production and industrial development of Chlorella vulgaris Beij.[Method]By using 721 visible spectrophotometer,the transmitted light intensity of different concentrations of C.vulgaris liquid under different wavelengths was measured to normalize the absorbance data,thus determining the optimal wavelength for the growth of C.vulgaris and the concentration of C.vulgaris liquid under the optimal wavelength.The regression equation of absorbance at the optimal wavelength and C.vulgaris concentration was obtained to derive the formula between equivalent concentration C and transmitted light intensity I,thus calculating the equivalent concentration of 0.25-fold C.vulgaris liquid under different transmittance.[Result]The transmitted light intensity of C.vulgaris reached the peak at 670 nm,indicating that 670 nm is the optimal wavelength for measuring C.vulgaris concentration.The regression equation between absorbance and C.vulgaris concentration was y=-1.479 7＋0.987x,with a correlation coefficient of 0.991,suggesting a high correlation between these two factors.The formula of equivalent concentration C and transmitted light intensity I was C=-ln（I/I0）/LK,where L indicates the optical path length（cuvette width）and K indicates the average cross-sectional area of C.vulgaris cells.[Conclusion]It is feasible to investigate indirectly the concentration of C.vulgaris with a spectrophotometer,which can be used to determine the optimal dehydration time of C.vulgaris.
