Identification of anti–hepatic fibrosis components in Periplaneta americana based on spectrum–effect relationship and chemical component separation

Periplaneta americana (PA) is used as a traditional medicine for hepatic diseases such as hepatic fibrosis in China. However, the relationship between the corresponding therapeutic effect and the chemical composition is still unclear. In this study, spectrum–effect relationship and chemical component separation were used to discover the potential of anti–hepatic fibrosis components of PA. The fingerprints of 10 batches of samples were established using HPLC, and the anti–hepatic fibrosis effect was determined using HSC-T6 cells. The spectrum–effect relationship between common peaks and efficacy values was established using partial least squares analysis. Partial peaks in the fingerprints were identified, including X₄ (9,12-heptadecanedenoic acid glyceride), X₅ (nonadecanoic acid methyl ester), X₆ (glyceryl oleate), X₇ (13,16,19-eicosatrienoic acid), X₉ (linoleic acid), X₁₀ (9,12,15-octadecatrienoic acid glyceride), X₁₂ (hexadecanoic acid), X₁₃ (oleic acid), and X₁₄ (octadecanoic acid), and their anti–hepatic fibrosis activity was tested to verify the results of spectrum–effect relationships. The results showed that X₄, X₆, X₇, and X₁₀ were the active ingredients of PA. This work successfully identified the partial anti–hepatic fibrosis components of PA, which can be used to explain the material basis for the PA anti–hepatic fibrosis effect.     

On the mean value of L-functions with the weight of character sums

The main purpose of this paper is using the estimate for character sums and the analytic method to study the mean value of the Dirichlet L-functions with the weight of character sums, and give an interesting mean value theorem.     

固体电解质ZrO2薄膜气敏光学特性的研究

本文采用溶胶凝胶法制备了ZrO₂薄膜,并研究它在乙醇蒸汽和氨蒸汽中的透射光谱,发现当掺入适量的稳定剂后,其光学特性显著增大,光学透过率随乙醇蒸汽和氨蒸汽的浓度增大而单调上升,敏感波段扩展至整个可见光区域.其气敏光学特性的灵敏度、单调性、可重复性表明了该材料是一种有实用价值的气敏光纤传感器新材料.本文亦讨论了ZrO₂薄膜的气敏光学机理.     

固体电解质ZrO_2薄膜气敏光学特性的研究

本文采用溶胶凝胶法制备了 Zr O2 薄膜 ,并研究它在乙醇蒸汽和氨蒸汽中的透射光谱 ,发现当掺入适量的稳定剂后 ,其光学特性显著增大 ,光学透过率随乙醇蒸汽和氨蒸汽的浓度增大而单调上升 ,敏感波段扩展至整个可见光区域 .其气敏光学特性的灵敏度、单调性、可重复性表明了该材料是一种有实用价值的气敏光纤传感器新材料 .本文亦讨论了 Zr O2 薄膜的气敏光学机理     

On the Mean Value of the Square of a Generalized Dedekind Sum

The main purpose of this paper is to use the mean value theorem of the Dirichlet L-functions to study the distribution property of a generalized Dedekind sum, and give a sharper mean square value formula.     

On the mean value of a sum analogous to character sums over short intervals

The main purpose of this paper is to study the mean value properties of a sum analogous to character sums over short intervals by using the mean value theorems for the Dirichlet L-functions, and to give some interesting asymptotic formulae. This work is supported by the N.S.F. (60472068) of P.R. China.     

The exponential Diophantine equation x2 + (3n 2 + 1) y = (4n 2 + 1) z

Let n be a positive integer. In this paper, using the results on the existence of primitive divisors of Lucas numbers and some properties of quadratic and exponential diophantine equations, we prove that if n ≡ 3 (mod 6), then the equation x ² + (3n ² + 1) ^y = (4n ² + 1) ^z has only the positive integer solutions (x, y, z) = (n, 1, 1) and (8n ³ + 3n, 1, 3).     

Kinetics of water filling the hydrophobic channels of narrow carbon nanotubes studied by molecular dynamics simulations

The kinetics of water filling narrow single-walled carbon nanotubes was studied using molecular dynamics simulations. The time required to fully fill a nanotube was linear with respect to the tube length. We observed that water molecules could enter into nanotubes of different lengths, either from one end or from both ends. The probability of having a nanotube filled completely from both ends increased exponentially with the tube length. For short tubes, filling usually proceeded from only one end. For long tubes, filling generally proceeded from both tube ends over three stages, i.e., filling from one end, filling from both ends, and filling from both ends with the dipole reorientation of water molecules to give a concerted ordering within the fully filled tube. The water molecules in the partially filled nanotube were hydrogen bonded similarly to those in the fully filled nanotube. Simulations for the reference Lennard-Jones fluid without hydrogen bonds were also performed and showed that the filling behavior of water molecules can be attributed to strong intermolecular hydrogen bonding.     

制冷系统六阶动态模型及仿真

在建立换热器模型时引入过冷度估计和过热度估计,采用分相区集总参数的方法,通过简化分析提取能够反映制冷系统动态特性的最少状态量,建立了制冷系统六阶动态模型。同时采用Matlab的Simulink仿真工具,比较分析六阶模型数据和实验数据,验证六阶模型的正确性。