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| 1 | Multi-scale modeling of liquid-metal cooling directional solidification and solidification behavior of nickel-based superalloy casting显示文摘Liquid-metal cooling(LMC)process can offer refinement of microstructure and reduce defects due to the increased cooling rate from enhanced heat extraction,and thus an understanding of solidification behavior in nickel-based superalloy casting during LMC process is essential for improving mechanical performance of single crystal(SC)castings.In this effort,an integrated heat transfer model coupling meso grain structure and micro dendrite is developed to predict the temperature distribution and microstructure evolution in LMC process.An interpolation algorithm is used to deal with the macro-micro grids coupling issues.The algorithm of cells capture is also modified,and a deterministic cellular automaton(DCA)model is proposed to describe neighborhood cell tracking.In addition,solute distribution is also considered to describe the dendrite growth.Temperature measuring,EBSD,OM and SEM experiments are implemented to verify the proposed model,and the experiment results agree well with the simulation results.Several simulations are performed with a range of withdrawal rates,and the results indicate that 12 mm·min^(-1)is suitable for LMC process in this work,which can result in a fairly narrow and flat mushy zone and correspondingly exhibited fairly straight grains.The mushy zone length is about 4.8 mm in the steady state and the average deviation angle of grains is about 13.9°at the height 90 mm from the casting base under 12 mm·min^(-1)withdrawal process.The competitive phenomenon of dendrites at different withdrawal rates is also observed,which has a great relevant to the temperature fluctuation. | Xuewei Yan Qjngyan Xu Guoqiang Tian Quanwei Liu Junxing Hou Baicheng Liu | 2021 | Journal of Materials Science & Technology2021，，8： | 4 |
| 2 | Progress in octahedral spherical hohlraum study显示文摘In this paper,we give a review of our theoretical and experimental progress in octahedral spherical hohlraum study.From our theoretical study,the octahedral spherical hohlraums with 6 Laser Entrance Holes(LEHs)of octahedral symmetry have robust high symmetry during the capsule implosion at hohlraum-to-capsule radius ratio larger than 3.7.In addition,the octahedral spherical hohlraums also have potential superiority on low backscattering without supplementary technology.We studied the laser arrangement and constraints of the octahedral spherical hohlraums,and gave a design on the laser arrangement for ignition octahedral hohlraums.As a result,the injection angle of laser beams of 50°-60°was proposed as the optimum candidate range for the octahedral spherical hohlraums.We proposed a novel octahedral spherical hohlraum with cylindrical LEHs and LEH shields,in order to increase the laser coupling efficiency and improve the capsule symmetry and to mitigate the influence of the wall blowoff on laser transport.We studied on the sensitivity of the octahedral spherical hohlraums to random errors and compared the sensitivity among the octahedral spherical hohlraums,the rugby hohlraums and the cylindrical hohlraums,and the results show that the octahedral spherical hohlraums are robust to these random errors while the cylindrical hohlraums are the most sensitive.Up till to now,we have carried out three experiments on the spherical hohlraum with 2 LEHs on Shenguang(SG)laser facilities,including demonstration of improving laser transport by using the cylindrical LEHs in the spherical hohlraums,spherical hohlraum energetics on the SGIII prototype laser facility,and comparisons of laser plasma instabilities between the spherical hohlraums and the cylindrical hohlraums on the SGIII laser facility. | Ke Lan Jie Liu Zhichao Li Xufei Xie Wenyi Huo Yaohua Chen Guoli Ren Chunyang Zheng Dong Yang Sanwei Li Zhiwen Yang Liang Guo Shu Li Mingyu Zhang Xiaoying Han Chuanlei Zhai Lifei Hou Yukun Li Keli Deng Zheng Yuan Xiayu Zhan Feng Wang Guanghui Yuan Haijun Zhang Bobin Jiang Lizhen Huang Wei Zhang Kai Du Runchang Zhao Ping Li Wei Wang Jingqin Su Xuewei Deng Dongxia Hu Wei Zhou Huaiting Jia Yongkun Ding Wanguo Zheng Xiantu He | 2016 | Matter and Radiation at Extremes2016，1，1： | 2 |
| 3 | CoPt-Co hybrid supported on amino modified SiO2 nanospheres as a high performance catalyst for hydrogen generation from ammonia borane显示文摘CoPt-Co hybrids were successfully supported on amino modified SiO2 nanospheres by a chemical reduction method at a temperature of 278 K.The solid carrier i.e.amino modified SiO2,provides numerous anchoring sites for the metal nanoparticles(NPs)to improve the dispersion while reducing the size of metal NPs.The supported NPs displayed a narrow particle size distribution on the SiO2 surface with an average diameter of 12 nm.The XRD results alongside with the binary alloy phase diagram suggest that the resulted NPs are bimetallic,composed of CoPt and amorphous Co.Among the prepared materials,the solid with the specific composition of SiO2@Pt0.1Co0.9was proved to be effective catalyst for ammonia borane(AB)hydrolysis in aqueous solution.The turnover frequency(TOF)value of the supported nanocatalyst was 25.59molH2min^-1·molM^-1,almost twice as that of unsupported Pt0.1Co0.9NPs while the activation energy was 37.05 kJ mol^-1.Furthermore,the SiO2@Pt0.1Co0.9composite manifested high catalytic activity even after five cycles of reuse. | Hongming Zhang Dandan Ke Lina Cheng Xuelei Feng Xuewei Hou Jin Wang Yuan Li Shumin Han | 2019 | Progress in Natural Science:Materials International2019，29，1： | 2 |
| 4 | Open and close-ended CoMoS_(3) nanotubes for hydrogen evolution in acidic and basic conditions显示文摘Electrochemical hydrogen evolution reaction(HER) is a promising route to harvest high-purity hydrogen(H_(2)).Efficient and selective energy transformations rely on the development of novel catalytic materials in terms of compositions and structures that survive under harsh conditions.This study focuses on a unique nanostructured CoMoS_(3) catalyst for HER under strong acidic and basic electrolyte.The morphologies of the catalysts are fine-tuned by altering reaction times in a hydrothermal reaction.Limited reaction time generates twisted thin-sheet CoMoS_(3)(12 h),which spins into a nanotube with an extended synthetic time(16 h).As the reaction time increases to 20 h,the CoMoS_(3) composite creates open-ended nanotubes,facilitating reactants to penetrate and react actively in the inner space of the nanotubes.Further,prolonged reaction time(24 h) results in the formation of the close-ended CoMoS_(3) nanotubes.We find out that the open-ended structure plays an important role in achieving fast kinetics as well as creating more active sites in HER reaction.The catalyst delivers a profound performance under both acidic and basic conditions,with overpotentials of 93 mV and 115 mV(at a current density of 10 mA/cm^(2)) in the acidic and basic electrolytes,respectively.Moreover,it shows superior long-term durability in both solutions.This work will provide a great foundation for understanding the morphology effect with the same composited catalyst towards energy conversion reactions,not limited to HER. | Yuan Li Xuewei Hou Jing Gu Veronika Mikhaylova Kangli Chen Hongming Zhang Shumin Han | 2021 | Journal of Energy Chemistry2021，30，6： | 0 |
| 5 | Cell wall associated immunity in plants显示文摘The plant cell wall is the first physical and defensive barrier against pathogens.The plant cell wall usually undergoes dynamic remodeling as an immune response to prevent infection by pathogens.In this review,we summarize advances on relationship between cell wall and immunity in plants.In particular,we outline current progresses regarding the regulation of the cell wall components,including cellulose,hemicellulose,pectin and lignin,on plant disease resistance.We also discuss the impacts of cell wall-derived cellodextrin,oligogalacturonic acid and xyloglucan/xylan oligosaccharides as potent elicitors or signal molecules to trigger plant immune response.We further propose future studies on dissecting the molecular regulation of cell wall on plant immunity,which have potentials in practical application of crop breeding aiming at improvement of plant disease resistance. | Jiangxue Wan Min He Qingqing Hou Lijuan Zou Yihua Yang Yan Wei Xuewei Chen | 2021 | Stress Biology2021，1，1： | 0 |
| 6 | First experimental comparisons of laser-plasma interactions between spherical and cylindrical hohlraums at SGⅢ laser facility显示文摘We present our recent laser-plasmas instability(LPI)comparison experiment at the SGIII laser facility between the spherical and cylindrical hohlraums.Three kinds of filling are considered:vacuum,gas-filling with or without a capsule inside.A spherical hohlraum of 3.6 mm in diameter,and a cylindrical hohlraum of 2.4 mm?4.3 mm are used.The capsule diameter is 0.96 mm.A flat-top laser pulse with 3 ns duration and up to 92.73 kJ energy is used.The experiment has shown that the LPI level in the spherical hohlraum is close to that of the outer beam in the cylindrical hohlraum,while much lower than that of the inner beam.The experiment is further simulated by using our 2-dimensional radiation hydrodynamic code LARED-Integration,and the laser back-scattering fraction and the stimulated Raman scatter(SRS)spectrum are post-processed by the high efficiency code of laser interaction with plasmas HLIP.According to the simulation,the plasma waves are strongly damped and the SRS is mainly developed at the plasma conditions of electron density from 0.08 n_(c) to 0.1 n_(c) and electron temperature from 1.5 keV to 2.0 keV inside the hohlraums.However,obvious differences between the simulation and experiment are found,such as that the SRS back-scattering is underestimated,and the numerical SRS spectrum peaks at a larger wavelength and at a later time than the data.These dif-ferences indicate that the development of a 3D radiation hydrodynamic code,with more accurate physics models,is mandatory for spherical hohlraum study. | Yaohua Chen Zhichao Li Xufei Xie Chunyang Zheng Chuanlei Zhai Liang Hao Dong Yang Wenyi Huo Guoli Ren Jie Liu Xiaoshi Peng Tao Xu Yulong Li Sanwei Li Zhiwen Yang Liang Guo Lifei Hou Yonggang Liu Huiyue Wei Xiangming Liu Weiyi Cha Yukun Li Keli Deng Zheng Yuan Xiayu Zhan Haijun Zhang Baibin Jiang Wei Zhang Kai Du Xuewei Deng Yongkun Ding Xiaofeng Wei Wanguo Zheng Xiaodong Chen Xiantu He Ke Lan | 2017 | Matter and Radiation at Extremes2017，2，2： | 0 |
| 7 | A novel and powerful approach for designing future crops—target editing promoter overcomes tradeoffs caused by gene pleiotropy显示文摘Over the past decades,crop breeding has undergone genetic improvement through semi-dwarfness,heterosis,and ideal plant architecture,which increases yield tremendously to feed the growing population worldwide.However,crop breeding is still largely constrained by tradeoffs among different agronomic traits,such as negative correlation between seed size and number. | Qingqing Hou Jing Wang Xuewei Chen | 2022 | Science China(Life Sciences)2022，65，10： | 0 |
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