http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Cloning, subcellular localization, and expression analysis of VvRING1a from grapevine
Jing Feng,Yu Huang,Jiang Lu 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.5
Polycomb group (PcG) proteins within polycomb repressive complex 1 (PRC1) and PRC2 are signifi cant epigenetic regulationfactors involved in controlling plant developmental transitions. PRC2 catalyzes H3K27 trimethylation (H3K27me3),and PRC1 recognizes the site of H3K27me3 and catalyzes H2AK119 monoubiquitination to maintain transcription repression. PRC2 components are conserved from plants to animals and have been investigated for a long time. However, thecompositions and functions of PRC1 vary between animals and plants. Plant PRC1 has only been confi rmed in recent years. Very little research has been conducted on PcG in grapevine ( Vitis vinifera ‘Cabernet Sauvignon’). Here, we cloned the fulllengthcoding sequence of the VvRING1a gene, which is homologous with the Arabidopsis thaliana PRC1 core componentAtRING1a . We then analyzed the structure, subcellular localization, and expression pattern. The tissue-specifi c expressionanalysis showed that VvRING1a is expressed in various tissues, including in roots, stems, leaves, fl owers, buds, and fruits. This study will be a useful reference for further study of VvRING1a .
Jing, Feng,He, Feng-You The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.6
In this study, a carrier-based pulse-width modulation (PWM) method for two-level voltage source inverters in the over-modulation region is proposed. Based on the superposition principle, the reference voltage vectors outside the linear modulation boundary are adjusted to relocate to the vector hexagon, while their fundamental magnitudes are retained. In accordance with the adjusted reference vector, the corresponding modulated waves are respectively deduced in over-modulation mode I and II to generate the gate signals of the power switches, guaranteeing the linearity of the fundamental output phase voltage in the over-modulation region. Moreover, due to the linear relationship between the voltage vector and the duty ratios, the complicated sector identification and holding angle calculation found in previous methods are avoided in the modulated wave synthesis, which provides great simplicity for the proposed carrier-based over-modulation strategy. Experimental results demonstrate the effectiveness and validity of the proposed method.
Jingfeng Wang,Qihan Shen,Han Jiang,Xuebei Pan 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
To analyze the axial compressive performance of elliptical concrete-fi lled thin-walled steel tube (ECFTST) columns, fi nite element (FE) modeling was built up by ABAQUS software in this paper. The material nonlinearity and the complex interaction between steel tube wall and core concrete in an elliptical section were considered in this numerical analysis. Failure modes and interaction mechanism of ECFTST stub columns were also studied. Moreover, a modifi ed equivalent circular diameter approach for ellipse feature was proposed to substitute for the constitutive relation of ECFTST columns. The prediction accuracy of this method was verifi ed by the comparison of the FE and test results in terms of failure modes, axial compressive capacities and axial force-axial displacement relation curves. Further, the infl uence of diameter-to-thickness ratio, cross-section slenderness and scale eff ect etc. on the performance of ECFTST stub columns were estimated under axial compressive loading. The results of numerical analysis showed that the axial force-axial displacement curves of the ECFTST stub columns were obviously aff ected by the confi nement factor. Lastly, based on the simple superposition approach and the unifi ed theory approach, two simplifi ed design methods were proposed to predict the axial compressive capacities of ECFTST columns.
Seismic Behavior Investigation on Blind Bolted CFST Frames with Precast SCWPs
Jingfeng Wang,Qihan Shen,Beibei Li 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
To explore seismic behavior of blind bolted concrete-fi lled steel tube (CFST) frames infi lled with precast sandwich composite wall panels (SCWPs), a series tests of blind bolted square CFST frames with precast SCWPs under lateral low-cyclic loading were conducted. The infl uence of the type of wall concrete, wall-to-frame connection and steel brace setting, etc. on the hysteretic curves and failure modes of the type of composite structure was investigated. The seismic behavior of the blind bolted CFST frames with precast SCWPs was evaluated in terms of lateral load–displacement relation curves, strength and stiff ness degradation, crack patterns of SCWPs, energy dissipation capacity and ductility. Then, a fi nite element (FE) analysis modeling using ABAQUS software was developed in considering the nonlinear material properties and complex components interaction. Comparison indicated that the FE analytical results coincided well with the test results. Both the experimental and numerical results indicated that setting the external precast SCWPs could heighten the load carrying capacities and rigidities of the blind bolted CFST frames by using reasonable connectors between frame and SCWPs. These experimental studies and FE analysis would enable improvement in the practical design of the SCWPs in fabricated CFST structure buildings.
Jingfeng Wang,Wanqian Wang,Shuai Pang,Bo Yu 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.5
In order to satisfy the requirements of seismic capacity of cold-formed thin-walled steel structure in low- and multi-rise buildings, an innovative cold-formed thin-walled steel tube truss (CFSTT) shear wall sheathed with both-side oriented strand board (OSB) was proposed in this paper. Five full-scale specimens of CFSTT shear walls which composed of square cold-formed thin-walled steel tubes, tracks, galvanized V-shaped connectors and OSB panels were tested under low-cyclic loading. The seismic performance of CFSTT shear wall was evaluated in terms of hysteretic behavior, envelop curves, ductility and energy dissipation, etc. Then, a practical nonlinear simplifi ed analysis method of CFSTT shear walls under low-cyclic reversed lateral loading was proposed based on the principle of equivalent tie rod model. The double- and fourlimb lattice studs were also simplifi ed as single steel tubes. Besides, a pivot modeling approach was suggested to stimulate the sheathing-to-frame connection. Subsequently, the fi nite element models of CFSTT shear walls were established based on this simplifi ed method and verifi ed by the experimental data. Numerical and experimental results indicated that CFSTT shear walls exhibited excellent seismic performance, and the accuracy of the simplifi ed of lattice stud was verifi ed. Furthermore, the simplifi ed method proposed in this paper will highly facilitate conducting the nonlinear analysis for shear walls.
Cyclic Experimental Behavior of CFST Column to Steel Beam Frames with Blind Bolted Connections
Jingfeng Wang,Haitao Wang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.3
This paper aims to investigate the seismic behavior of blind bolted end plate composite frames between square or circular concrete fi lled steel tubular (CFST) columns and steel beams. Two composite frames were tested under a constant axial load on the CFST columns and a lateral cyclic load on the frame. Each specimen composed of CFST columns and steel beams was selected to represent a plan frame in an assembly building. Failure pattern of the type of frames was analyzed to comprehend the structural response. The seismic resistance ability of the blind bolted CFST frames was also estimated in terms of hysteretic curves, ductility and energy dissipation etc. The eff ect of column section type and end plate type on the type of semi-rigid CFST frames was studied. The test results showed that at the same steel ratio of the column section, the bearing capacity and energy dissipation of square CFST frame were higher than those of circular CFST frame at ultimate state. Strain response of main members in each CFST frame was also estimated. The internal force analysis of the test CFST frames with semi-rigid connections was discussed and evaluated the eff ect of the bending moment distribution. It was concluded that the novel typed CFST frames exhibited excellent seismic performance and structural internal force redistribution. The experimental studies will be useful for design and application of the blind bolted CFST frames in fabricated steel structure building.