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| 1 | Key Technologies of Ultra-high Voltage Hybrid LCC-VSC MTDC Systems显示文摘The key technologies of ultra-high voltage hybrid LCC-VSC MTDC systems are investigated,focusing on the design of system configurations,converter topologies and the control and protection system.A double converter per pole of VSC connection is proposed along with the design of a 5000 MW VSC valve to develop a±800 kV/5000 MW large-capacity power transmission.The hybrid MMC topology capable of clearing the DC faults and the control strategy are developed to effectively improve the reliability in case of overhead line faults.The control and protection system of the LCC-VSC MTDC system is introduced to offer flexible operations under both normal and abnormal conditions,which includes voltage/current margin-based coordination,converter switch-in and switch-out,re-connection and drop-off of a third station.Simulations of an LCC-VSC MTDC system based on the LCC-VSC MTDC project are performed. | Hong Rao Yuebin Zhou Shukai Xu Xipeng Cai Wanyu Cao Yiliang Xu Chenglin Ren | 2019 | CSEE Journal of Power and Energy Systems2019，5，3： | 14 |
| 2 | Revealing the influence of high magnetic field on the solute distribution during directional solidification of Al-Cu alloy显示文摘The effect of the high magnetic field(MF)on the distribution of solute concentration during directional solidification of Al-Cu alloy under low growth speed was experimentally investigated.The amount of nonequilibrium eutectic is quantified via X-ray computed tomography(XCT)and demonstrated to reduce with the application of MF.Further,experimental results reveal that the MF alleviates the microsegregation and increases the average Cu concentration in solid solution,leading to the increases of the effective partition coefficient ke.It was also found that Cu concentration in solid solution increases continuously with the increasing intensity of MF,following the strengthening of micro-hardness.The change of ke under the MF is demonstrated to attribute to the thermoelectric magnetic convection(TEMC)in the mushy zone and the thermoelectric magnetic force(TEMF)acting on the solid.The TEMC is supposed to cause secondary convection owing to the inequality in flow velocities of circulation in different positions of dendrite stem.And the vacancies created by the proliferation and movement of dislocations induced by TEMF in the matrix is supposed to be able to capture solute atoms and thus enhance the solute concentration in the solid solution. | Pengchuan Wang Sansan Shuai Chenglin Huang Xin Liu Yanan Fu Jiang Wang Zhongming Ren | 2021 | Journal of Materials Science & Technology2021，，29： | 3 |
| 3 | Data-aided synchronization algorithm dispensing with searching procedures for UWB communications显示文摘Rapid and accurate synchronization constitutes a major challenge in deploying Ultra-Wideband impulse radio (UWB-IR) for indoor wireless communications.This paper develops a data-aided (DA) synchro-nization algorithm dispensing with searching procedures for UWB-IR communications.By adopting a stream of alternating orthogonal pulses,frame-level synchronization can be achieved without channel information.With-out utilizing any searching procedure,the timing offset estimator is obtained in a closed form.Because exhaustive search can be avoided,both computational complexity and synchronization time are reduced.Simulations and comparisons are provided to illustrate the advantages of our design over the alternatives. | REN ZhiYuan JIANG Ting ZHONG Yi ZHAO ChengLin | 2012 | Science China(Information Sciences)2012，55，4： | 3 |
| 4 | The effect of pore size and porosity of Ti6Al4V scaffolds on MC3T3-E1 cells and tissue in rabbits显示文摘Electron beam melting(EBM) allows the fabrication of specific porous titanium implants, whereas their in vitro and in vivo biological performance should be further investigated. In this study, we examined the porous Ti6 Al4 V scaffolds(low, 334.1 μm pore size with 55.4% porosity;middle, 383.2 μm pore size with 65.2% porosity;and high, 401.6 μm pore size with 78.1%porosity) fabricated through EBM. The structural characterization and mechanical properties of porous Ti6 Al4 V scaffolds were measured through micro-computed tomography(micro-CT), scanning electron microscopy, and a material testing system.MC3 T3-E1 cells were used to assess the proliferation and differentiation of the cells on different scaffolds at day 7 and day 14 based on the expression levels of genes, including alkaline phosphatase, bone morphogenetic protein-2, osteopontin and runtrelated transcription factor-2. Rabbits with distal femoral defects were utilized to evaluate bone ingrowth in the porous titanium.All of the samples were subjected to micro-CT and histological analysis after 12 weeks. Results showed that compressive Young’s modulus of 0.3–1.1 GPa was similar to the trabecular bone. The three types of porous Ti6 Al4 V scaffolds were inclined to promote cell proliferation, whereas cell differentiation and bone ingrowth into the porous scaffolds were biased to the porous titanium with relatively large pores and porosity(middle and high). This study implied that the present porous implant design,which had the combined advantages of different pore sizes and porosity, might be meaningful and promising for trabecular bone defect restoration. | LUAN HuiQin WANG LiTing REN WeiYan CHU Zhao Wei HUANG YunFei LU ChengLin FAN YuBo | 2019 | Science China(Technological Sciences)2019，62，7： | 2 |
| 5 | The ozone mass transfer characteristics and ozonation of pentachlorophenol in a novel microchannel reactor显示文摘 | Jian Ren Songbo He Chunbo Ye Guangwen Chen Chenglin Sun | 2012 | Chemical Engineering Journal2012，，： | 1 |
| 6 | Gene encoding polygalacturonase inhibitor in apple fruit is developmentally regulated and activated by wounding and fungal infection显示文摘 | Chenglin Yao William S. Conway Ruihua Ren David Smith Gavin S. Ross Carl E. Sams | 1999 | Plant Molecular Biology1999，，6： | 1 |
| 7 | Microstructure and mechanical properties of directionally solidified Al-rich Ni_(3)Al-based alloy under static magnetic field显示文摘The influence of a longitudinal static magnetic field on microstructures and mechanical properties of Ni_(3)Al-based alloy during directional solidification at the growth speed of 25μm/s and 100μm/s has been experimentally investigated.Results reflected that the utilization of a 0.5 T magnetic field refines the Ni Al dendrites at both speeds of growth.When applying a high magnetic field,the columnar-to-equiaxed transition(CET)occurred at growth speed of 25μm/s and dendrite networks formed at growth speed of 100μm/s.Tensile property results indicated that the refinement of dendrites enhanced both plasticity and ultimate tensile strength of Ni-Al alloy.The change of microstructures and mechanical properties should be attributed to the combined action of the thermoelectric magnetic convection(TEMC)in mushy zone together with the thermoelectric magnetic force(TEMF)acting on the solid.When applying a low magnetic field(0.5 T),the TEMF is too small to fragment the dendrites,and the refined dendrites is mainly due to the TEMC in the interdendritic regions.At a lower growth speed,the TEMF is supposed to strong enough to fragment the dendrites and induce the occurrence of CET under 2 or 4 T.When the growth speed increased to 100μm/s,no obvious CET was observed,but a vertical secondary convection is induced by the circulation in the parallel plane,which promotes the growth of secondary and tertiary branches,leading to the formation of abnormally developed high order dendrites.The hierarchical dendritic structure was suggested to provide a channel for rapid crack propagation and thus degraded the mechanical properties. | Xin Liu Sansan Shuai Chenglin Huang Shijun Wu Tao Hu Chaoyue Chen Jiang Wang Zhongming Ren | 2022 | Journal of Materials Science & Technology2022，，15： | 0 |
| 8 | Revealing the Diversity of Dendritic Morphology Evolution During Solidification of Magnesium Alloys using Synchrotron X-ray Imaging:A Review显示文摘In this paper,the diversity of complicated dendrite microstructure and its evolution behavior during solidification in different magnesium alloys under various processing conditions were illustrated using synchrotron X-ray imaging technique.A variety of dendritic morphologies and branching structures were revealed,i.e.,sixfold plate-like symmetric structure in Mg-Al-based structure,12-branch structure in Mg-Zn-based alloys and 18-branch structure in Mg-Sn-and Mg-Ca-based alloys as well as seaweed like hyper-branched structure in Mg-38wt%Zn alloy.In addition,a dendrite morphology and orientation transition with increasing addition of Zn content were also observed in Mg-Zn alloy,with dendrite growth pattern transform from anisotropy(low Zn addition)with sixfold symmetric snow-flake structure to relative isotropy(intermediate Zn addition)where seaweed morphology presented and then back to anisotropy(high Zn addition)when only 12 branches with preferred<11 2 1>orientations were observed.The phase-field model representing the typical dendritic morphologies and branching structures under various conditions was also depicted and discussed.Further,the two-dimensional(2D)real-time dendrite growth dynamics in different Mg-based alloys captured using synchrotron X-ray radiography for unveiling the originate of theα-Mg dendrite was reviewed.Following this,the four-dimensional(3D+time)synchrotron X-ray tomographic in situ observation of dendritic morphology evolution indicating the formation mechanism of the diverse dendritic morphology during Mg-Sn-and Mg-Zn-based alloys was also summarized.Finally,the future study on exploring the complicated dendritic morphologies and their origination during solidification of Mg-based alloys is prospected. | Yanan Wang Sansan Shuai Chenglin Huang Tao Jing Chaoyue Chen Tao Hu Jiang Wang Zhongming Ren | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，2： | 0 |
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