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Material manufacturing from atomic layer

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International Journal of Extreme Manufacturing 2023年第4期5卷 454-460页

作者： Xinwei Wang Rong chen Shuhui Sun School of Advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055People’s Republic of China School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan 430070People’s Republic of China Institut National de la Recherche Scientifique(INRS) Centre Energie Matériaux TélécommunicationsVarennesQuébec J3X 1P7Canada

Atomic scale engineering of materials and interfaces has become increasingly important in material manufacturing.Atomic layer deposition(ALD)is a technology that can offer many unique properties to achieve atomic-scale material manufacturing controllability.Herein,we discuss this ALD technology for its applications,attributes,technology status and challenges.We envision that the ALD technology will continue making significant contributions to various industries and technologies in the coming years.

关键词： atomic-scale manufacturing,atomic layer deposition,area selective deposition,applications

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A water-stable organolead iodide material for overall photocatalytic CO_(2) reduction

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Nano Research 2022年第12期15卷 10084-10089页

作者： Rong chen Guodong Gao Jingshan Luo Institute of Photoelectronic Thin Film Devices and Technology Solar Energy Research CenterKey Laboratory of Photoelectronic Thin Film Devices and Technology of TianjinMinistry of Education Engineering Research Center of Thin Film Photoelectronic TechnologyRenewable Energy Conversion and Storage CenterNankai UniversityTianjin300350China

The utilization of perovskites as photocatalysts to convert CO_(2) into fuels and chemicals has received wide attention recently.However,their instability in water hinders their long-term application for overall photocatalytic CO_(2) reduction.Herein,we integrate the water-stable perovskite-like organolead iodide crystalline material[Pb8I8(H2O)3]8+[-O2C(CH2)4CO_(2)-]4(TJU-16)with Au co-catalyst for photocatalytic CO_(2) reduction in aqueous solution without sacrificial reagent.Under the AM 1.5 G simulated illumination,the TJU-16 with 0.19 wt.‰ Au co-catalyst steadily generated electrons for CO_(2) reduction reaction,which was 2.2 times of pure TJU-16.The Au0.19/TJU-16 catalyzed CO_(2) reduction at a rate of 84.2μmol·g-1·h-1,and achieved a solar-to-fuel(STF)conversion efficiency of 0.034%.Our work will motivate the rational design of water-stable perovskite-like materials for photocatalytic applications.

关键词： water-stable organolead iodide photocatalytic CO_(2)conversion

The winners of rising stars in plant sciences 2022

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Molecular Plant 2022年第10期15卷 1497-1499页

作者： Wenjia Wang Rong chen Xiaofeng Cui On Behalf of the Editorial Team of Molecular Plant and Plant Communications

Aiming to recognize excellnt early-career plant scientists and to encourage new geneations of scientists to conduct cutting-edge plant research,Molecular Plant and Plant Communications were proud to announce the establishment of the Rising Stars in Plant Sciences(RSPS)award and initiated a worldwide campaign to encourage the application for RSPS2022 in the early part of this year.Thanks to the incalculable support from the global plant science community and the scientific comittee,RSPS2022 ended with great success by recognizing five young plant scientists as the winners in July,2022.They are Dr.Yang Bai,Dr.PierreMarc Delaux,Dr.Xiaoqi Feng,Dr.Yangnan Gu,and Dr.Rosa Lozano-Duran.Big congratulations to these five winners of RSPS2022!In this Editorial,we brefly introduce their research interests and scientific achievements to the community.

关键词： Plant initiated stars

Asymmetric virtual machine replication for low latency and high available service

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Science China(Information Sciences) 2018年第9期61卷 141-155页

作者： Rong chen Haibo chen Institute of Parallel and Distributed Systems Shanghai Jiao Tong University

Providing fault tolerance support to client-to-server applications is critical in the data center and cloud computing environments. Virtualization provides a direct way of achieving high availability by encapsulating the protected applications into the virtual machine and by periodically checkpointing the entire virtual machine(VM) state to the backup replication. However, existing VM replication solutions suffer from either excessive checkpointing overhead and network latency or unnecessary CPU resources consumption in backup replication. In this study, we exploit the ingredients of output packets and consider that the replication system maintains external consistency if the pre-released packets originate the already synchronized states.Furthermore, we transform the active-active primary and slave VM combination into an active-semiactive one by shrinking the number of active virtual CPUs(v CPUs) in the slave VM. The former optimization mechanism improves the performance in read-mostly client-to-server networked applications, whereas the latter one relieves the problem of double scheduling in the slave host. Therefore, we proposed the COLO++system which is built over COLO and is a non-stop service solution with coarse-grained lock-stepping VMs for client-to-server systems. The two plus signs represent two of the optimizations. Experimental results using COLO++ implemented on KVM and Linux depict that it achieves nearly native VM performance under read-mostly workloads, as well as lower scheduling overhead in backup replication.

关键词： virtualization fault tolerance VM replication memory CPU scheduling

Gaussian mixture model based adaptive control for uncertain nonlinear systems with complex state constraints

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Chinese Journal of Aeronautics 2022年第5期35卷 361-373页

作者： Yuzhu BAI Rong chen Yong ZHAO Yi WANG College of Aerospace and Engineering National University of Defense TechnologyChangsha 410073China Nanjing Research Institute of Electronics Technology Nanjing 210000China

This paper addresses an uncertain nonlinear control system problem with complex state constraints and mismatched uncertainties.A novel Gaussian Mixture Model(GMM)based adaptive PID-Nonsingular Terminal Sliding Mode Control(NTSMC)(GMM-adaptive-PID-NTSMC)method is proposed.It is achieved by combining a GMM based adaptive potential function with a novel switching surface of PID-NTSMC.Next,the stability of the closed-loop system is proved.The main contribution of this paper is that the GMM method is applied to obtain the analytic description of the complex bounded state constraints,ensuring that the states'constraints are not violated with GMM-based adaptive potential function.The developed potential function can consider the influence of uncertainties.More importantly,the GMM-adaptive-PID-NTSMC can be generalized to control a more representative class of uncertain nonlinear systems with constrained states and mismatched uncertainties.In addition,the proposed controller enhances the robustness,and requires less control cost and reduces the steady state error with respect to the Artificial Potential Function based Nonsingular Terminal Sliding Mode Control(APF-NTSMC),GMM-NTSMC and GMM-adaptive-NTSMC.At last,numerical simulation is performed to validate the superior performance of the proposed controller.

关键词： Gaussian mixture model Nonlinear systems State constrained Terminal sliding mode control Uncertain

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CFD Simulation of a container ship in random waves using a coupled level-set and volume of fluid method

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Journal of Hydrodynamics 2023年第2期35卷 222-231页

作者： Hamn-Ching chen Chia-Rong chen Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTexasUSA

The coupled level-set and volume of fluid(CLSVOF)method is an advanced interface-capturing method that has been extended to handle overset grid systems.However,artificial uneven interface may be observed across block boundaries of different sizes and geometries.We present an improved inter-grid VOF interpolation and mass correction scheme to address the issue.To demonstrate the capability of the improved CLSVOF method,it is applied to the simulation of a container ship in pitch and heave motions under both head sea and following sea irregular wave conditions.Our simulation proves that the improved CLSVOF method is capable of revealing detailed physics difficult to see with other methods.Those phenomena simulated in our work include the extensive greenwater propagation on the ship deck,the breakup of overtopping waves into small droplets,and the formation and collapse of air pockets in sudden bow and stern slamming which cause strong and highly localized impacts on the ship bow,stern,and rudder.

关键词： Computational fluid dynamics(CFD) couple level-set and volume of fluid(CLSVOF)method random waves overset grid system violent free surface flow bow and stern slamming

Dynamic compression behavior of TiZrNbV refractory high-entropy alloys upon ultrahigh strain rate loading

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Journal of Materials Science & Technology 2023年第30期161卷 201-219页

作者： Kerong Ren Hongyang Liu rong Ma Sen chen Siyuan Zhang Ruixin Wang Rong chen Yu Tang Shun Li Fangyun Lu College of Sciences National University of Defense TechnologyChangsha 410008China Aviation Maintenance NCO Academy Air Force Engineering UniversityXinyang 464001China The Peac Institute of Multiscale Sciences Chengdu 610031China College of Aerospace Science and Engineering National University of Defense TechnologyChangsha 410008China

In this study,the dynamic compressive response behavior of a body-centered cubic(BCC)single-phase TiZrNbV refractory high-entropy alloy(RHEA)was investigated under impact at speeds of 313-1584 m s^(-1)using two-stage,gas-gun-driven,high-speed plate-impact experiments;recovery sample analysis;and theoretical calculations.The strain rate and pressure were approximately 10^(7) s^(−1) and 5.07-29.37 GPa,respectively.The results showed that the TiZrNbV RHEA had a Hugoniot elastic limit of 4.12-5.86 GPa and a spall strength of 1.84-2.03 GPa.The initial yield strength of the alloy showed a strong strain-rate dependence and could be described by the modified Zerilli-Armstrong model,while the phonon-damping effect was the main reason for its high strain-rate sensitivity.Microstructural analysis showed that the dynamic deformation of the TiZrNbV RHEA was controlled by the dislocation slip,dislocation proliferation,intersection of the deformation bands,and grain refinement.The analysis also showed that the intergranular,transgranular,and mixed-type cracks dominated the spall failure of the material.The dynamic Hall-Petch effect and pinning from the lattice distortion led to high dynamic yield strength.The critical strain rate for the phonon drag effect was positively related to the relative atomic mass and local strain field of the metals.Within the experimental loading range,the RHEA showed good structural stability,and simultaneously,the theoretical calculation method for the equation of state based on a cold-energy mixture could accurately predict its shock-response behavior.The valence-electron concentration(VEC)had a direct effect on the shock-compression properties of the HEAs;higher VEC implied more difficulty in compressing the HEAs.The findings of this study provide insights into understanding the mechanical response characteristics of RHEAs under extreme conditions such as high-speed impact and ultrahigh strain-rate loading.

关键词： Refractory high-entropy alloys Shock compression Spall Dynamic yield Equation of state Ultrahigh strain rate

Comparative study of the effects of gold and silver nanoparticles on the metabolism of human dermal fibroblasts

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Regenerative Biomaterials 2020年第2期7卷 221-232页

作者： Yan Huang Xiaoying Lü Rong chen Ye chen State Key Laboratory of Bioelectronics School of Biological Science and Medical EngineeringSoutheast UniversityNanjing 210096P.R.China

The purpose of this article was to explore the effects of gold nanoparticles(GNPs)and silver nano-particles(SNPs)with different cytotoxicities on human dermal fibroblasts(HDFs)at the metabolic level.First,~20 nm of GNPs and SNPs were prepared,and their effects on the proliferation of HDFs were evaluated.Then,a metabolomics technique was used to analyse the effects of GNPs and SNPs on the expression profiles of metabolites in HDFs after 4,8 and 24h of treatment.Furthermore,the key metabolites and key metabolic pathways involved in the interaction of GNPs and SNPs with HDFs were identified through expression pattern analysis and metabolic pathway analysis of differentially expressed metabolites and were finally verified by experiments.The results of the cytotoxicity experiments showed that there was no cytotoxicity after the treatment of GNPs for 72 h,while the cytotoxicity of the SNPs reached grade 1 after 72 h.By using metabolomics analysis,29,30 and 27 metabolites were shown to be differentially expressed in HDFs after GNP treatment,while SNPs induced the differential expression of 13,33 and 22 metabolites after 4,8 and 24h of treatment,respectively.Six and four candidate key metabolites in the GNP and SNP groups were identified by expression pattern analysis and metabolic pathway analysis,respec-tively.The key metabolic pathways in the GNP and SNP groups were identified as the glutathione metabolic pathway(the key metabolite of which was glutathione)and the citrate cycle pathway(the key metabolite of which was malic acid).Based on the experiments used to verify the key metabolites and key metabolic pathways,it was found that the increase in glutathione after GNP treatment might trigger an oxidative stress protection mechanism and thus avoid cytotoxicity.After exposure to SNPs,the citric acid content was increased,mainly through the citrate cycle path-way,thereby inhibiting the synthesis of malic acid to affect the formation of ATP and finally leading to cytotoxicity.

关键词： gold and silver nanoparticles human dermal fibroblasts metabolomics and bioinformatics metabolic pathway

The Long-Sought-After Plant Heterochromatin Protein 1

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Molecular Plant 2019年第1期12卷 14-15页

作者： Rong chen Molecular Plant

Heterochromatin,being transcriptionally inactive,is the highly condensed form of chromatin that is associated with Histone H3 lysine 9 methylation (H3K9me)and DNA methylation in eukaryotic cells.In fission yeast and a... 详细信息

关键词： Heterochromatin H3K9me animals