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Influence of powder oxidation on powder properties and formability in H13 hot-work steels processed by electron beam melting

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Journal of Iron and Steel Research International 2024年第4期31卷 924-932页

作者： wei Liu Yan Wang Li-xiong Han Ying-kang wei Hui-ping Tang Shi-feng Liu School of Metallurgical engineering Xi'an University of Architecture and TechnologyXi'an 710055ShaanxiChina School of engineering Zhejiang University City CollegeHangzhou 310015ZhejiangChina

The oxygen content of metal powder is decisive for the recyclability of *** research on the effect of oxygen content on powder properties and material formability has practical significance for economical production with additive manufacturing while preventing the waste of ***,we deliberately oxidized the powder by baking at high temperature to increase the oxygen content in the powder and gave the calculation method of the oxygen content in the powder oxidation *** majority of oxygen element was found in the oxide particles in the powder and the oxide flm on the powder surface,which did affect the flowability of the *** is worth noting that the increase in the oxygen content does not change the phase of H13 steel,but it can promote the molten pool flow and obtain a smoother *** increase in the oxygen content in the powder is not the decisive factor for the formability and defects of the printed *** is the combined effect of the powder deformation,the increase in the oxygen content,and the impurity pollution after repeated use,which leads to the limitation of repeated utilization of the powder.

关键词： Additive manufacturing electron beam melting H13 steel powder-Powder oxidation

Cyclohexanol optimizes Pt/ionomer interface in fuel cell cathodes

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Science China Chemistry 2024年第2期67卷 417-419页

作者： Lei Tong Hai-wei Liang Hefei National Research Center for Physical Sciences at the Microscale Department of ChemistryUniversity of Science and Technology of ChinaHefei230026China

This highlight is based on a recent article published in Nature Catalysis, in which wei's group [1] from Chongqing University proposes a novel approach to enhance the performance of proton exchange membrane fuel cells(PeMFCs)by adjusting the interface between Pt and ionomer in the cathode catalyst layer. Their strategy involves adding cyclohexanol to the cathode catalyst ink to impede the adsorption of sulfonate groups from the ionomer onto Pt nanoparticles, which results in the release of Pt activity sites and a significant improvement in the mass transport efficiency.

关键词： interface catalyst adding

Unveiling the intrinsic properties of single NiZnFeO_x entity for promoting electrocatalytic oxygen evolution

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Chinese Chemical Letters 2024年第4期35卷 181-186页

作者： Zhihao Gu Jiabo Le Hehe wei Zehui Sun Mahmoud elsayed Hafez wei Ma Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular engineering Feringa Nobel Prize Scientist Joint Research CenterFrontiers Science Center for Materiobiology and Dynamic ChemistrySchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Ningbo Institute of Materials Technology and engineering Chinese Academy of SciencesNingbo 315201China Department of Chemistry Faculty of ScienceBeni-Suef UniversityBeni-Suef 62511Egypt

Although considerable research efforts have been devoted to the design and development of non-noble electrocatalysts for oxygen evolution reaction(OeR), substantial enhancement of OeR performance with commercial-scale water electrolysis remains a big challenge. This could result from the difficulties in detecting the intrinsic properties and overlooking the assembly process for electrochemical OeR process. Here, we employ a microjet collision method to investigate the intrinsic OeR activities of individual NiZnFeO_x entities with and without a moderate magnetic field. Our results demonstrate that single NiZnFeO_x nanoparticles(NPs) show the excellent OeR performance with a lowest onset potential(~1.35 V vs. RHe) and a greatest magnetic enhancement(~118%) among bulk materials, single agglomerations and NPs. Furthermore, we explore the utility of theoretical investigation by density functional theory(DFT)calculations for studying OeR process on NiZnFeO_x surfaces without and with spin alignment, indicating monodispersed NiZnFeO_xNPs with totally spin alignment facilitates the OeR process under the external magnetic field. It is found that the well-dispersion of NiZnFeO_x NPs would increase the electrical conductivity and the surface spin state, resulting in promoting their OeR activities. This work provides a test for uncovering the essential roles of NPs assembly to a significant promotion of their magnet-assisted OeR.

关键词： Single entity OeR Magnetic enhancement electrocatalysis Well-dispersion

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面向全息视频通信的自适应分块传输方法

电子学报 2024年第4期52卷 1144-1154页

作者：朱原玮黄亚坤乔秀全北京邮电大学网络与交换技术全国重点实验室北京100876

基于分治和按需传输思想的分块传输技术是解决三维全息视频流传输的有效手段.然而,现有的分块方案要么缺乏自适应机制,要么不适用于移动实时通信场景.为此,本文提出了VVSTiler(Volumetric Video Streaming Tiling selector),一种面向全... 详细信息

基于分治和按需传输思想的分块传输技术是解决三维全息视频流传输的有效手段.然而,现有的分块方案要么缺乏自适应机制,要么不适用于移动实时通信场景.为此,本文提出了VVSTiler(Volumetric Video Streaming Tiling selector),一种面向全息视频通信的自适应分块传输方法,能够在动态且有限的计算和带宽资源下最大化视频的观感质量.具体而言,本文对不同粒度的分块方案带来的影响进行了初步研究,发现细粒度的分块方案可提高动态网络资源的利用率,粗粒度的分块方案可保证视频编解码效率和鲁棒性.基于此,本文构建了考虑预测视口、可用计算资源以及网络带宽等上下文信息的视频观感质量优化问题,并设计了一个高效的求解方案以支持在线的分块粒度决策.本文在8iVFB(8i Voxelized Full Bodies)标准数据集上将VVSTiler与当前主流的分块传输方法进行了比较.实验结果表明,VVSTiler在有偏差的视口预测情况下实现了高达60.4%的视频观感质量提升,在较准确的视口预测情况下平均每帧视频节省了27%的带宽资源.

关键词：全息视频通信体积视频流点云视频自适应分块视口预测视频观感质量

Glial progenitor heterogeneity and plasticity in the adult spinal cord

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Neural Regeneration Research 2024年第12期19卷 2567-2568页

作者： Haichao wei Jia Qian Wu Department of Neurosurgery McGovern Medical SchoolThe University of Texas Health Science Center at HoustonHoustonTXUSA Center for Stem Cell and Regenerative Medicine UT Brown Foundation Institute of Molecular MedicineHoustonTXUSA MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences HoustonTXUSA

Glial progenitor cells were reported to have the capacity to generate various types of cells in both the central nervous system(CNS)and peripheral nervous *** progenitor cells can respond to diverse environmental signals and transform into distinct populations,each serving specific ***,the adult spinal cord hosts various populations of glial progenitors,a region integral to the central nervous *** development,glial progenitors express glial fibrillary acidic protein(GFAP;Dimou and Gotz,2014).However,the specific identities of GFAP-expressing progenitors in the adult spinal cord were not thoroughly investigated.

关键词： functions plasticity thoroughly

Hetero-phase zirconia encapsulated with Au nanoparticles for boosting electrocatalytic nitrogen reduction

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Chinese Chemical Letters 2024年第5期35卷 509-513页

作者： Xue Xin Qiming Qu Islam e.Khalil Yuting Huang Mo wei Jie Chen weina Zhang Fengwei Huo Wenjing Liu Key Laboratory of Flexible electronics(KLOFe)&Institute of Advanced Materials(IAM) Nanjing Tech UniversityNanjing 211816China

electrocatalytic nitrogen reduction reaction(NRR)is considered as an attractive approach for ammonia synthesis under mild conditions.A bottleneck of NRR is the exploration of efficient catalysts for accelerating reaction kinetics,among which heterogeneous structures possessing distinct atomic arrangement could modify electronic structure,and therefore altering their NRR ***,we report a facile strategy for fabricating hetero-phase metal oxides derived from metal organic framework that are further integrated with Au nanoparticles as NRR *** phase composition of zirconia can be easily adjusted by simply changing the reaction temperature,where the monoclinic and tetragonal phases with the roughly close proportions have a distinct interface,leading to a strong interaction between Au and ZrO_(2).The enhanced interaction renders Au to be more electropositive and facilitates stronger binding to N_(2).As a result,a remarkable ammonia yield of 22.32μg h^(-1)mg_(cat.)^(-1) and a Faradaic efficiency of 31.92%can be achieved at low *** work is expected to pave the way for the design of heterogeneous structures and the exploration of hetero-phase nanostructures in boosting the electrocatalytic NRR.

关键词： Hetero-phase Metal-organic framework derivatives Zirconia Nitrogen reduction reaction electrochemistry

Lactate-mediated medium-chain fatty acid production from expired dairy and beverage waste

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environmental Science and ecotechnology 2024年第5期21卷 278-286页

作者： Bin Bian Wenxiang Zhang Najiaowa Yu wei Yang Jiajie Xu Bruce e.Logan Pascal e.Saikaly Water Desalination and Reuse Center(WDRC) King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia environmental Science and engineering Program Biological and Environmental Science and Engineering(BESE)DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Kingdom of Saudi Arabia Department of Civil and environmental engineering The Pennsylvania State UniversityUniversity ParkPA16802USA Research Centre of ecology&environment for Coastal Area and Deep Sea Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou511458China School of Marine Science Ningbo UniversityNingbo315211China

Fruits,vegetables,and dairy products are typically the primary sources of household food ***,anaerobic digestion is the most used bioprocess for the treatment of food waste with concomitant generation of ***,to achieve a circular carbon economy,the organics in food waste should be converted to new chemicals with higher value than *** we demonstrate the feasibility of medium-chain carboxylic acid(MCCA)production from expired dairy and beverage waste via a chain elongation platform mediated by *** a two-stage fermentation process,the first stage with optimized operational conditions,including varying temperatures and organic loading rates,transformed expired dairy and beverage waste into lactate at a concentration higher than 900 mM C at 43℃.This lactate was then used to produce>500 mM C caproate and>300 mM C butyrate via microbial chain ***,lactate-producing microbes such as Lactobacillus and Lacticaseibacillus were regulated by temperature and could be highly enriched under mesophilic conditions in the firststage *** the second-stage chain elongation reactor,the dominating microbes were primarily from the genera Megasphaera and Caproiciproducens,shaped by varying feed and inoculum *** network analysis revealed positive correlations among species from the genera Caproiciproducens,Ruminococcus,and CAG-352,as well as Megasphaera,Bacteroides,and Solobacterium,indicating strong microbial interactions that enhance caproate *** findings suggest that producing MCCAs from expired dairy and beverage waste via lactate-mediated chain elongation is a viable method for sustainable waste management and could serve as a chemical production platform in the context of building a circular bioeconomy.

关键词： Microbial chain elongation Medium chain carboxylic acids Food waste Fermentation

Novel Adaptive Memory event-Triggered-Based Fuzzy Robust Control for Nonlinear Networked Systems via the Differential evolution Algorithm

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Ieee/CAA Journal of Automatica Sinica 2024年第8期11卷 1836-1848页

作者： wei Qian Yanmin Wu Bo Shen School of electrical engineering and Automation Henan Polytechnic UniversityJiaozuo 454000China College of Information Science and Technology Donghua UniversityShanghai 201620China

This article mainly investigates the fuzzy optimization robust control issue for nonlinear networked systems characterized by the interval type-2(IT2)fuzzy technique under a differential evolution *** provide a more reasonable utilization of the constrained communication channel,a novel adaptive memory event-triggered(AMeT)mechanism is developed,where two event-triggered thresholds can be dynamically adjusted in the light of the current system information and the transmitted historical *** conditions with less conservative design of the fuzzy imperfect premise matching(IPM)controller are presented by introducing the Wirtinger-based integral inequality,the information of membership functions(MFs)and slack ***,under the IPM policy,a new MFs intelligent optimization technique that takes advantage of the differential evolution algorithm is first provided for IT2 TakagiSugeno(T-S)fuzzy systems to update the fuzzy controller MFs in real-time and achieve a better system control ***,simulation results demonstrate that the proposed control scheme can obtain better system performance in the case of using fewer communication resources.

关键词： Adaptive memory event-triggered(AMeT) differential evolution algorithm fuzzy optimization robust control interval type-2(IT2)fuzzy technique.

Conservation genomics of the critically endangered Chinese pangolin

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Science China(Life Sciences) 2024年第10期67卷 2051-2061页

作者： Shichao wei Huizhong Fan Wenliang Zhou Guangping Huang Yan Hua Shibao Wu Xiao wei Yiting Chen Xinyue Tan Fuwen wei Jiangxi Province Key Laboratory of Conservation Biology College of ForestryJiangxi Agricultural UniversityNanchang 330045China Center for evolution and Conservation Biology Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)Guangzhou 511458China Institute of Zoology Chinese Academy of SciencesBeijing 100101China Guangdong Provincial Key Laboratory of Silviculture Protection and UtilizationGuangdong Academy of ForestryGuangzhou 510520China School of Life Science South China Normal UniversityGuangzhou 510631China Terrestrial Wildlife Rescue and epidemic Diseases Surveillance Center of Guangxi Nanning 530003China

The Chinese pangolin(Manis pentadactyla,MP)has been extensively exploited and is now on the brink of extinction,but its population structure,evolutionary history,and adaptive potential are ***,we analyzed 94 genomes from three subspecies of the Chinese pangolin and identified three distinct genetic clusters(MPA,MPB,and MPC),with MPB further divided into MPB1 and MPB2 *** divergence of these populations was driven by past climate *** MPB2 and MPC,recent human activities have caused dramatic population decline and small population size as well as increased inbreeding,but not decrease in genomic variation and increase in genetic load probably due to strong gene flow;therefore,it is crucial to strengthen in situ habitat management for these two *** contrast,although human activities have a milder impact on MPA,it is at high risk of extinction due to long-term contraction and isolation,and genetic rescue is urgently ***1 exhibited a relatively healthy population status and can potentially serve as a source ***,our findings provide novel insights into the conservation of the Chinese pangolin and biogeography of the mammals of eastern Asia.

关键词： Manis pentadactyla conservation genomics demographic history human activities conservation strategies