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Zhiquan Wang,Jianjun Li,Xuejun Jiang,Xuejun Jiang,Neng Wang,Shimin Wang 대한의학회 2009 Journal of Korean medical science Vol.24 No.1
The effects of the antiarrhythmic drug propafenone at c-type kv1.4 channels in Xenopus laevis oocytes were studied with the two-electrode voltage-clamp techinique. Defolliculated oocytes (stage V-VI) were injected with transcribed cRNAs of ferret Kv1.4△N channels. During recording, oocytes were continuously perfused with control solution or propafenone. Propafenone decreased the currents during voltage steps. The block was voltage-, use-, and concentration- dependent manners. The block was increased with positive going potentials. The voltage dependence of block could be fitted with the sum of monoexponential and a linear function. Propafenone accelerated the inactivate of current during the voltage step. The concentration of half-maximal block (IC50) was 121 μM/L. With high, normal, and low extracellular potassium concentrations, the changes of IC50 value had no significant statistical differences. The block of propafenone was PH- dependent in high-, normal- and low- extracellular potassium concentrations. Acidification of the extracellular solution to PH 6.0 increased the IC50 values to 463 μM/L, alkalization to PH 8.0 reduced it to 58 μM/L. The results suggest that propafenone blocks the kv1.4 N channel in the open state and give some hints for an intracellular site of action.
Strong limit theorems for weighted sums of NOD sequence and exponential inequalities
Xuejun Wang,Shuhe Hu,Andrei I. Volodin 대한수학회 2011 대한수학회보 Vol.48 No.5
Some properties for negatively orthant dependent sequence are discussed. Some strong limit results for the weighted sums are obtained, which generalize the corresponding results for independent sequence and negatively associated sequence. At last, exponential inequalities for negatively orthant dependent sequence are presented.
STRONG LIMIT THEOREMS FOR WEIGHTED SUMS OF NOD SEQUENCE AND EXPONENTIAL INEQUALITIES
Wang, Xuejun,Hu, Shuhe,Volodin, Andrei I. Korean Mathematical Society 2011 대한수학회보 Vol.48 No.5
Some properties for negatively orthant dependent sequence are discussed. Some strong limit results for the weighted sums are obtained, which generalize the corresponding results for independent sequence and negatively associated sequence. At last, exponential inequalities for negatively orthant dependent sequence are presented.
ON COMPLETE CONVERGENCE AND COMPLETE MOMENT CONVERGENCE FOR A CLASS OF RANDOM VARIABLES
Wang, Xuejun,Wu, Yi Korean Mathematical Society 2017 대한수학회지 Vol.54 No.3
In this paper, the complete convergence and complete moment convergence for a class of random variables satisfying the Rosenthal type inequality are investigated. The sufficient and necessary conditions for the complete convergence and complete moment convergence are provided. As applications, the Baum-Katz type result and the Marcinkiewicz-Zygmund type strong law of large numbers for a class of random variables satisfying the Rosenthal type inequality are established. The results obtained in the paper extend the corresponding ones for some dependent random variables.
MAXIMAL INEQUALITIES AND STRONG LAW OF LARGE NUMBERS FOR AANA SEQUENCES
Xuejun, Wang,Shuhe, Hu,Xiaoqin, Li,Wenzhi, Yang Korean Mathematical Society 2011 대한수학회논문집 Vol.26 No.1
Let {$X_n$, $n{\geq}1$} be a sequence of asymptotically almost negatively associated random variables and $S_n=\sum^n_{i=1}X_i$. In the paper, we get the precise results of H$\acute{a}$jek-R$\acute{e}$nyi type inequalities for the partial sums of asymptotically almost negatively associated sequence, which generalize and improve the results of Theorem 2.4-Theorem 2.6 in Ko et al. ([4]). In addition, the large deviation of $S_n$ for sequence of asymptotically almost negatively associated random variables is studied. At last, the Marcinkiewicz type strong law of large numbers is given.
ON COMPLETE CONVERGENCE AND COMPLETE MOMENT CONVERGENCE FOR A CLASS OF RANDOM VARIABLES
Xuejun Wang,Yi Wu 대한수학회 2017 대한수학회지 Vol.54 No.3
In this paper, the complete convergence and complete moment convergence for a class of random variables satisfying the Rosenthal type inequality are investigated. The sufficient and necessary conditions for the complete convergence and complete moment convergence are provided. As applications, the Baum-Katz type result and the Marcinkie\-wicz-Zygmund type strong law of large numbers for a class of random variables satisfying the Rosenthal type inequality are established. The results obtained in the paper extend the corresponding ones for some dependent random variables.
Exponential inequalities and complete convergence for a LNQD sequence
Wang Xuejun,Hu Shuhe,Yang Wenzhi,Li Xiaoqin 한국통계학회 2010 Journal of the Korean Statistical Society Vol.39 No.4
Some exponential inequalities for a linearly negative quadrant dependent sequence are obtained. By using the exponential inequalities, we give the complete convergence and almost sure convergence for a linearly negative quadrant dependent sequence. In addition,the asymptotic behavior of the probabilities for the partial sums of a linearly negative quadrant dependent sequence is studied.
Miaomiao Wang,Min Wang,Xuejun Wang Korean Mathematical Society 2023 대한수학회보 Vol.60 No.3
In this paper, under some suitable conditions, we study the Spitzer-type law of large numbers for the maximum of partial sums of independent and identically distributed random variables in upper expectation space. Some general results on necessary and sufficient conditions of the Spitzer-type law of large numbers for the maximum of partial sums of independent and identically distributed random variables under sublinear expectations are established, which extend the corresponding ones in classic probability space to the case of sub-linear expectation space.
Study on liquid-solid jet erosion characteristics of 316L stainless steel
Guan Wang,Qianfeng Gao,Linyuan Kou,Pei Zhang,Wenhui Wang,Jianfei Deng,Xuejun Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
The essence of erosion is the dynamic damage and material loss process of a material caused by particle impact. The failure mechanism of erosion is the result of the interaction of multiphase flow, particle characteristics, material properties, particle impact process, and other factors. This paper employs experimental and numerical simulation methods to investigate the erosion behavior of a solid-liquid two-phase flow of 316L stainless steel jet from the angle of erosion, to explain the erosion behavior from both macroscopic and microscopic perspectives. The results discovered that the kinetic energy of the fluid is converted into pressure potential energy, which changes the kinematic characteristics of the particles and influences how they erode. The particles erode the target material by plowing and impacting at various erosion angles, and the erosion rate exhibits an increasing-decreasing-increasing tendency as the erosion angle increases, the 45° corresponds to the maximum erosion rate. Due to the particles to harden the target surface, the erosion effect is diminished in the time dimension. Comparing to high erosion angles, the reduction rate of the erosion rate in the late experiment stage is small for slow erosion angles. In the last 3 hours of the experiment, the total erosion of 316L stainless steel at 90° erosion angle was only 35 %. This provides a theoretical foundation for failure prevention in transport components containing solid particles.