Special Transmission Gear Invalidation Analysis Coupled with Finite Element Method Based on Meshless Local Petrov-Galerkin Method

Bing Dai,J. P Shao,Xuemei Wu,Guangbin Yu,Ye Song,Ge Jianghua 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.10

Aiming at high nonlinear problem of special transmission gear invalidation analysis, provided a method which based on Meshless local Petrov-Galerkin method coupled with finite element method and method to solve fracture problem of special transmission gear. Simulation calculation has been done to non-involute beveloid gear developed by project team. Calculation result verified efficiency of the simulation method. The method has important meaning to novel gear development and research.

Overexpression of the AtSTK Gene Increases Salt, PEG and ABA Tolerance in Arabidopsis

Lei Bing,Cui-Cui Feng,Jing-Lan Li,Xiao-Xu Li,Baocun Zhao,Yin-Zhu Shen,Zhan-Jing Huang,Rong-Chao Ge 한국식물학회 2013 Journal of Plant Biology Vol.56 No.6

AtSTK (At5g02800), which is a serine-threonineprotein kinase gene of Arabidopsis thaliana, was cloned, andits function was studied. The study found that the overexpressionof AtSTK could significantly improve the ability of A. thaliana to tolerate salt, PEG, and ABA stresses. RT-PCRanalysis revealed that the expression of the AtSTK genecould be obviously induced by salt, PEG, and ABA. Theexamination of the physiological characteristics showed thatthe overexpression of AtSTK in Arabidopsis significantlyreduced the plasma membrane permeability, significantlyincreased the proline content, and decreased the MDA content. These changes may reflect the physiological mechanismsthrough which AtSTK overexpression improves stress resistancein Arabidopsis. In addition, the overexpression of the AtSTKgene significantly antagonised the inhibitory effect of highconcentrations of exogenous ABA on Arabidopsis seedgermination. The subcellular localisation results showed thatAtSTK is located in both the cytosol and the nucleus. Theexamination of its tissue-specific expression showed thatAtSTK is expressed in various Arabidopsis tissues and isparticularly strongly expressed in the vessels. The signallingpathway analysis indicated that AtSTK might transfer thesalt stress signal in Arabidopsis through the MAPK pathway.

A rapid modeling method and accuracy criteria for common-cause failures in Risk Monitor PSA model

Zhang, Bing,Chen, Shanqi,Lin, Zhixian,Wang, Shaoxuan,Wang, Zhen,Ge, Daochuan,Guo, Dingqing,Lin, Jian,Wang, Fang,Wang, Jin Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.1

In the development of a Risk Monitor probabilistic safety assessment (PSA) model from the basic PSA model of a nuclear power plant, the modeling of common-cause failure (CCF) is very important. At present, some approximate modeling methods are widely used, but there lacks criterion of modeling accuracy and error analysis. In this paper, aiming at ensuring the accuracy of risk assessment and minimizing the Risk Monitor PSA models size, we present three basic issues of CCF model resulted from the changes of a nuclear power plant configuration, put forward corresponding modeling methods, and derive accuracy criteria of CCF modeling based on minimum cut sets and risk indicators according to the requirements of risk monitoring. Finally, a nuclear power plant Risk Monitor PSA model is taken as an example to demonstrate the effectiveness of the proposed modeling method and accuracy criteria, and the application scope of the idea of this paper is also discussed.

Simulation and experimental test of load-sharing behavior of planetary gear train with flexible ring gear

Haodong Ge,Yunbo Shen,Yuquan Zhu,Yingzhao Xiong,Bing Yuan,Zongde Fang 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

For simulation and calculation of load-sharing behavior of planetary gear train by using the lumped mass method, an exact computational model of time-varying meshing stiffness of inner gear meshing pair with thin-walled sleeve was needed. Therefore, based on analysis of the flexible ring gear structure with thin-walled sleeve, an accurately model is proposed to obtain the time-varying internal meshing stiffness. Then, according to Newton's second law, a group of parametric differential equations of planetary gear system were derived, with which the load-sharing coefficient of the system was obtained. The load-sharing behavior experimental for the planetary gear train with five planetary gears and with flexible ring gear was designed, while the arrangement of the strain gauge was investigated and the test was performed under different working conditions. The test results show that the error of load sharing coefficient calculated by theory and experiment is less than 5 %.

Large-eddy simulation of low-swirl multi-nozzle combustion with co- and counter-swirling arrays

Weijie Liu,Bing Ge,Shusheng Zang,Huiru Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1

Large-eddy simulation (LES) of CH 4 -air low-swirl flame was carried out in a multi-nozzle combustor with two burner configurations by using a premixed flamelet model. The multi-nozzle burner includes a co-swirling array where all five nozzles act in the same direction and a counter-swirling array where the center nozzle is in the opposite swirling direction to the outer nozzles. LES results are in good agreement with OH-planar laser-induced florescence data in terms of OH concentrations and combustion progress variables. Numerical results show that the flow of each nozzle is constant before merging. The neighboring flows interact with each other and generate a highvelocity zone with intensive turbulence. The kinetic energy in the interacting region for the co-swirling array is larger than that for the counter-swirling array. After neighboring flow combining, the flow develops into a unified swirling motion similar to a single swirling flow for the co-swirling array, whereas the flow maintains the individual swirling structures for the counter-swirling arrangement. However, the swirling array exerts minimal effect on multi-nozzle combustion in terms of the temperature distributions and combustion progress of premixed low-swirl multi-nozzle flames.

The Effect of Transformation on the Virulence of Streptococcus pneumoniae

Xue-Mei Zhang,Yi-Bing Yin,Dan Zhu,Bao-De Chen,Jin-Yong Luo,Yi-Ping Deng,Ming-Fang Liu,Shu-Hui Chen,Jiang-Ping Meng,Kai Lan,Yuan-Shuai Huang,Ge-Fei Kang 한국미생물학회 2005 The journal of microbiology Vol.43 No.4

Although pneumococcus is one of the most frequently encountered opportunistic pathogen in the world, the mechanisms responsible for its infectiveness have not yet been fully understood. In this paper, we have attempted to characterize the effects of pneumococcal transformation on the pathogenesis of the organism. We constructed three transformation-deficient pneumococcal strains, which were designated as Nos. 1d, 2d, and 22d. The construction of these altered strains was achieved via the insertion of the inactivated gene, comE, to strains 1, 2 and 22. We then conducted a comparison between the virulence of the transformation-deficient strains and that of the wild-type strains, via an evaluation of the ability of each strain to adhere to endothelial cells, and also assessed psaA mRNA expression, and the survival of hosts after bacterial challenge. Compared to what was observed with the wild-type strains, our results indicated that the ability of all of the transformation-deficient strains to adhere to the ECV304 cells had been significantly reduced (p < 0.05), the expression of psaA mRNA was reduced significantly (p < 0.05) in strains 2d and 22d, and the median survival time of mice infected with strains 1d and 2d was increased significantly after intraperitoneal bacterial challenge (p < 0.05). The results of our study also clearly indicated that transformation exerts significant effects on the virulence characteristics of S. pneumoniae, although the degree to which this effect is noted appears to depend primarily on the genetic background of the bacteria.

Nano-structured and architecturally engineered thin films and optical surfaces

Weiguo LIU,Shaobo GE,Zhili CHEN,Bing SHI 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Characteristic modes and flow structure of non-premixed flame in humid-air combustion

Zang Shusheng,Gu Xin,Ge Bing 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.2

and the flame stability limit in turbulent non-premixed flame. Two-dimensional Particle Image Velocimetry (PIV) meas-urements were made to quantify the velocity field, with and without steam injected. The results indicate the additionof steam decreases the recirculation flow and reduces the distance between the forward and aft stagnation points. Thedetailed stabilization regimes show that the critical fuel-to-air velocity ratios of the central fuel penetration in the humidair case are 16% to 22% lower, and the partially quenching limits are at least 25% lower. The decreased penetrationlimit is due to a reduction in momentum of the humid air. An analysis of flamelet concepts reveals that increased chem-

The Effect of Transformation on the Virulence of Streptococcus pneumoniae

Zhang Xue-Mei,Yin Yi-Bing,Zhu Dan,Chen Bao-De,Luo Jin-Yong,Deng Vi-Ping,Liu Ming-Fang,Chen Shu-Hui,Meng Jiang-Ping,Lan Kai,Huang Yuan-Shuai,Kang Ge-Fei The Microbiological Society of Korea 2005 The journal of microbiology Vol.43 No.4

Although pneumococcus is one of the most frequently encountered opportunistic pathogen in the world, the mechanisms responsible for its infectiveness have not yet been fully understood. In this paper, we have attempted to characterize the effects of pneumococcal transformation on the pathogenesis of the organism. We constructed three transformation-deficient pneumococcal strains, which were designated as Nos. 1d, 2d, and 22d. The construction of these altered strains was achieved via the insertion of the inactivated gene, comE, to strains 1, 2 and 22. We then conducted a comparison between the virulence of the transformation-deficient strains and that of the wild-type strains, via an evaluation of the ability of each strain to adhere to endothelial cells, and also assessed psaA mRNA expression, and the survival of hosts after bacterial challenge. Compared to what was observed with the wild-type strains, our results indicated that the ability of all of the transformation-deficient strains to adhere to the ECV304 cells had been significantly reduced (p < 0.05), the expression of psaA mRNA was reduced significantly (p < 0.05) in strains 2d and 22d, and the median survival time of mice infected with strains Id and 2d was increased significantly after intraperitoneal bacterial challenge (p < 0.05). The results of our study also clearly indicated that transformation exerts significant effects on the virulence characteristics of S. pneumoniae, although the degree to which this effect is noted appears to depend primarily on the genetic background of the bacteria.

Integrated Protection Unit Design for Power Networks

Zhan-feng Fan,Sheng-ming Ge,Z Q Bo,Lin Wang,Feng-quan Zhou,Xing Liu,Guo-bing Song 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.4

This paper presents an hardware design solution for integrated protection of distribution systems (Network Protection Unit) by combining transient polarity comparison technique, which is based on the detection and processing of fault generated transient current signals. The integrated protection relays installed at each substation of a distribution network are communicated with the Network Protection Unit through specially designed Packet Transport Network (PTN) for fast and reliable transmission of transient polarity current signals. The relay detects the faulted generated super-imposed current signals. The transient polarity identification algorithm is then applied to the super-imposed signals to identify the polarity of the signal detected. The Network Protection Unit can collect all the transient polarity current signals under its protection area. Then The direction of a fault is determined by comparison of the polarity of the signals derived from all the line sections connected to the substation. The actual faulted section is identified by the Network Protection Unit through comparing the directional information from various stations. Simulation results presented in the paper demonstrate the feasibility of the scheme.