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- 저자 : Zhibin Zeng (검색결과 6 건)
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Fatigue study on additional cutout between U shaped rib and floorbeam in orthotropic bridge deck
Xiaochen Ju,Zhibin Zeng,Xinxin Zhao,Xiaoguang Liu 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.3
The field around additional cutout of the floor beam web in orthotropic bridge deck was subjected to high stress concentration, especially the weld toe between floor beam and U shaped rib and the free edge of the additional cutout. Based on different considerations, different geometrical parameters of additional cutout were proposed in European, American and Japanese specifications, and there remained remarkable differences among them. In this study, considering influence of out-ofplane deformation of floor beam web and U shaped rib, parameter analysis for additional cutout under typical load cases was performed by fine finite element method. The influence of additional cutout shape and height to the stress distribution around the additional cutout were investigated and analyzed. Meanwhile, the static and fatigue test on this structure details was carried out. The stress distribution was consistent with the finite element analysis results. The fatigue property for additional cutout height of 95mm was slightly better than that of 61.5 mm.
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Riming Yan,Zhibin Zhang,Qinggui Zeng,Du Zhu,Ju Chu 한국생물공학회 2011 Biotechnology and Bioprocess Engineering Vol.16 No.3
Energy conversion efficiency of photoautotrophic microalgae plays an important role in the utilization of light energy for cell growth and production of metabolites. To understand the utilization of light energy,Synechococcus sp. PCC7942 was cultivated at different incident light intensities of 15.8, 47.3, and 94.6 μmol/m^2/sec in continuous culture. The influence of light on the carbon and energy metabolism of microalgae was investigated by combining metabolic flux analysis (MFA) and chlorophyll fluorescence analysis (CFA). Results showed that the yields of biomass based on ATP (Y_(ATP)) and total light energy (Y_E) both declined with increasing light, and the maximal values of Y_(ATP) and Y_E were estimated to be 4.73 g/mol-ATP, and 17.10 × 10_(−3) g/kJ respectively, at the examined conditions. The overall efficiency of energy conversion against total absorbed energy changed with the varying irradiances. However, the actual conversion efficiency of total energy based on CFA was almost constant,regardless of the different irradiances used in the present study.
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Study on uplift performance of stud connector in steel-concrete composite structures
Xiaochen Ju,Zhibin Zeng 국제구조공학회 2015 Steel and Composite Structures, An International J Vol.18 No.5
The main role of studs, which act as connectors of the steel-concrete composite structures, is to ensure that the steel and the concrete work together as a whole. The studs in steel-concrete composite structures bear the shearing force in the majority of cases, but in certain locations, such as the mid-span of a simply supported composite beam, the studs bear axial uplift force. The previous studies mainly focused on the shearing performance of the stud by some experimental and theoretical effort. However, rare studies involved the uplift performance of studs. In this paper, the single stud uplift test on 10 composite specimens was performed. Meanwhile, based on the test, numerical analysis was introduced to simulate the concrete damage process due to the stud uplifted from concrete. The static ultimate bearing capacity, under which the stud connector was pulled out from the damaged reinforced concrete, is much larger than the cyclic ultimate bearing capacity, under which the weld joint between stud and steel plate fractured. According to the fatigue test results of 7 specimens, the fatigue S-N curve of the construction detail after minus 2 times standard deviation is logN = 24.011 - 9.171 logΔσ, the fatigue strength corresponding to 2 x 10 6 cycles is 85.33 MPa.
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Efficient Bluetooth Video Transmission with Resource Manager
Yindi Yao,Hualian Tang,Zhibin Zeng 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2
A scheme of wireless real video transmission with optimized Quality-of-service is proposed in this paper. It combines H.264 video compression technology with Bluetooth technology to reduce demand of bandwidth and power consumption. Resource manager (RM) is used to smooth video output traffic and to partially eliminate peak of video stream transmitted in Bluetooth channel. The RM monitors status of video transmitters, manipulates and coordinates the being encoded video, and adopts traffic credits to support real-time video services. Measured results show that a maximal speed of transmission can be achieved with a best suitable ACL packets type, rather than the maximum payload packet, according to SNR to achieve. The system can support real-time video transmission with good quality. And more, it can be realized easily in mobile application for its good transportability and robustness.
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Guoxu Wang,Jie Wu,Bifan Zeng,Zhibin Xu,Wanqiang Wu,Xiaoqian Ma 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.1
A well-performed core power control to track load changes is crucial in pressurized waterreactor (PWR) nuclear power stations. It is challenging to keep the core power stable at thedesired value within acceptable error bands for the safety demands of the PWR due to thesensitivity of nuclear reactors. In this paper, a state-space model predictive control (MPC)method was applied to the control of the core power. The model for core power control wasbased on mathematical models of the reactor core, the MPC model, and quadratic programming(QP). The mathematical models of the reactor core were based on neutron dynamicmodels, thermal hydraulic models, and reactivity models. The MPC model waspresented in state-space model form, and QP was introduced for optimization solutionunder system constraints. Simulations of the proposed state-space MPC control system inPWR were designed for control performance analysis, and the simulation results manifestthe effectiveness and the good performance of the proposed control method for core powercontrol.
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Laifa Ding,Binhao Qin,Keke Ge,Zhibin Zeng,Khaskin Vladyslav,Feng Li,Yupeng Zhang,Haiyan Wang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
The butt joint of 30 mm-thick Ti–6Al–3Nb–2Zr–1Mo titanium alloys were achieved by the magnetron-controlled narrow gapTIG welding. Microstructure and mechanical properties of joint were comprehensively explored. Ti6321 base metal (BM)was composed of primary α (accounting for 55%) and structure of β transformation (secondary α + β phase). Fine grainedheat affected zone was composed of primary α, acicular α and β phase. Coarse grained heat affected zone was composed ofacicular α and clusters of α phase with different orientations. The fusion zone (FZ) was composed of acicular α phase, lathα phase and a few β phase. The ratio of high-angle grain boundaries in the HAZ reached the maximum of 94.5% while thoseof the FZ and BM were 78.1% and 59.4%, respectively. Due to the differences in microstructures and grain orientation, thehardness of FZ (286 HV) was lower than those of BM (304 HV) and HAZ (306 HV). The tensile strength of the weldingjoint (838 MPa) reached 95% of the BM (883 MPa), and the joint showed excellent impact performance with great impactenergies of FZ (72 J) and HAZ (75 J), higher than that of BM (51 J). It was owing to the greater ratio of high-angle grainboundaries in FZ and HAZ that could store more grain boundary energies. Thicker phases hinder the growth of cracks, and,therefore, improve the impact performance of the joint.
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