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Microstructure and microsegregation of directionally solidified Ti–45Al–8Nb alloy with different solidification rates

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Rare Metals 2016年第1期35卷 70-76页

作者： Xiang-Jun Xu Lin Song Xiao-ou Jin Dong-Dong Han xin Wang Jun-Pin Lin Materials and Chemistry School Zhongyuan University of Technology State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing School of Architecture and Engineering Heilongjiang University

Microstructure and microsegregation of directionally solidified Ti-45Al-8Nb alloy were investigated by scanning electron microscopy（SEM）,transmission electron microscopy（TEM） and electron probe microanalyzer（EPMA）.For the alloy solidified at the solidification rates（v） ranging from 10 to 400 μm·s^（-1）,the microstructure of the mushy zone exhibits a cellular-dendritic structure at lower growth rate（v=10-50 μm·s^（-1）） and a typical dendritic morphology at higher growth rate（v = 100-400 μm·s^（-1））.The relationship between primary dendrite arm spacing（λ_1）and v is λ_1=1.08×10~3v^（-0.35）.Al and Nb elements segregate at interdendritic zone and in the dendritic core,*** solid of mushy zone,a relatively flat concentration profile is observed for the typical dendrite structure,and Nb enriches in B2 phase induced by β→α＋β*** content of B2 phase is hardly affected by *** extent of microsegregation in steady-state zone decreases at a lower growth rate because holding the samples at higher temperature after solidification for a long time can homogenize the solid effectively.

关键词： Nb-containing TiAl alloy Solidification Microstructure Microsegregation

Yb^(3+) Ion Upconversion Luminescence from YbEr:ZBLAN Glass Excited by 966 nm Laser Light

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Chinese Physics Letters 2001年第2期18卷 280-282页

作者： CHEN Xiao-Bo NIE Yu-xin WEN ou Analysis and Testing Center Key Laboratory of Beam Technology and Materials Modification of Education MinistryBeijing Normal UniversityBeijing 100875 Laboratory of Optical Physics Institute of PhysicsChinese Academy of SciencesBeijing 100080 Beijing Glass Research College Beijing 100062

The upconversion luminescence of several YbEr co-doped Zr-Ba-La-Al-Na(ZBLAN)glass samples(Er(0.5)Yb(3):ZBLAN,Er(0.5)Yb(1):ZBLAN and Er(0.5):ZBLAN)has been studied.A new kind of upconversion cooperative radiation fluorescence,which comes from coupled cluster states of two Yb^(3+)ions has been *** is significant in that it may lead to a new path to achieve blue upconversion luminescence,which has promising upconversion applications.

关键词： ZBLAN luminescence cluster

Role of feline ANP32 proteins in regulating polymerase activity of influenza A virus

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Journal of Integrative Agriculture 2024年第9期23卷 3145-3158页

作者： Gang Lu Feiyan Zheng Yuqing Xiao Ran Shao Jiajun ou xin Yin Shoujun Li Guihong Zhang College of Veterinary Medicine South China Agricultural UniversityGuangzhou 510642China State Key Laboratory for Animal Disease Control and Prevention Harbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150000China Maoming Branch Guangdong Laboratory for Lingnan Modern AgricultureMaoming 525000China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China

Recently,increasing natural infection cases and experimental animal challenge studies demonstrated domestic cats are susceptible to multiple subtypes influenza A virus(IAV)***,some subtype IAV strains could circulate in domestic cats after cross-species transmission and even infected humans,posing a threat to public *** factors related to viral polymerase activity could determine host range of IAV and acidic nuclear phosphoprotein 32(ANP32)is the most important one among ***,role of cat-derived ANP32 on viral polymerase activity and host range of IAV is still *** the present study,a total of 10 feline ANP32(feANP32)splice variants(including 5 feANP32A,3 feANP32B,and 2 feANP32E)were obtained from domestic cats by *** alignment results demonstrated amino acid deletions and/or insertions occurred among feANP32 variants,but all feANP32 proteins were primarily localized to cell *** replication systems for several representative IAV strains were established and the support ability of feANP32 on IAV polymerase activity was *** results indicated that most feANP32A and feANP32B splice variants were able to support all the tested IAV strains,though the support activity of a single feANP32 protein on polymerase activity varied among different IAV *** addition,the role of feANP32 in supporting H3N2 canine influenza virus was determined by investigating viral replication in ***,our study systematically investigated the support activity of feANP32 on IAV,providing a clue for further exploring the mechanism of susceptibility of cats to IAV.

关键词： ANP32 influenza A virus feline cross-species transmission

Isolated Cu-Sn diatomic sites for enhanced electroreduction of CO_(2)to CO

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Nano Research 2023年第7期16卷 8729-8736页

作者： Wei Liu Haoqiang Li Pengfei ou Jing Mao Lili Han Jun Song Jun Luo Huolin L.xin State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Department of Physics and Astronomy University of CaliforniaIrvineCA 92697USA Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Tianjin Key Lab of Photoelectric Materials&DevicesTianjin University of TechnologyTianjin 300384China Department of Mining and Materials Engineering McGill UniversityMontreal H3A 0C5Canada Teaching and Analytical Instrumentation Center School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Electrochemical CO_(2)reduction reaction(CO_(2)RR)to high-value product,CO,not only provides a key feedstock for the wellestablished Fischer-Tropsch process but also mitigates the greenhouse ***,it suffers from sluggish reaction kinetics,competitive hydrogen evolution reaction,and low ***,we report non-precious Cu-Sn diatomic sites anchored on nitrogen-doped porous carbon(CuSn/NPC)as an efficient catalyst for CO_(2)RR to *** catalyst exhibits outstanding selectivity with CO Faradaic efficiency(FE)up to 99.1%,much higher than those of individual Cu(66.2%)and Sn(51.3%)single-atom ***,high stability is confirmed by consecutive 24 h electrolysis with high selectivity from CO_(2)to *** calculations reveal an obvious activation of CO_(2)with weakened C-O bonds and distorted CO_(2)configuration upon chemisorption on the CuSn/NPC *** is also suggested CuSn/NPC is more selective for the CO_(2)RR with dominant CO production during the electrolysis,rather than the competing hydrogen evolution reaction.

关键词： CO_(2)reduction reaction Cu-Sn active site CO product dual-atom electrocatalyst density functional theory(DFT)calculation

Microbial diversity assembled from series-diluted suspensions of disease-suppressive soil determines pathogen invasion resistance

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Pedosphere 2021年第1期31卷 221-225页

作者： Yannan ou Zongzhuan SHEN Beibei WANG Menghui DONG Cece QIAO rong LI Qirong SHEN liangru Provincial Key Lab jor Solid Organic Wase Uilianion Nariomal Engineering Research Ceouer fow Orpanie based FernilisersJiangsne Collaborarive Ionovantion Cener for Solid Organie Wase Resource Uiliaion.Nnpjing Agriculural Univeniy.Naning 210095Chine Hainan key Inahoratory for Sastainable Uilisatiomn of Tropical Blo-reources Colleger of Tropical Crops Hainen Universdry.Haikou 570228China

Dear Editor,Soil microbial biodiversity loss caused by agricultural intensification, climate change, and the application of chemical fertilizer has become a serious problem that threatens humans (Wall et al., 2015). One phenomenon responsible for economic and food security issues is soil-borne diseases(Fisher et al., 2012), which were reported to be associated with microbial diversity loss (Shen et al., 2013;Fu et al.,2017).

关键词： soil diluted resistance

Metasurface-enabled on-chip multiplexed diffractive neural networks in the visible

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Light(Science & Applications) 2022年第7期11卷 1443-1453页

作者： Xuhao Luo Yueqiang Hu Xiangnian ou xin Li Jiajie Lai Na Liu xinbin Cheng Anlian Pan Huigao Duan National Research Center for High-Efficiency Grinding College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China Advanced Manufacturing Laboratory of Micro-Nano Optical Devices Shenzhen Research InstituteHunan UniversityShenzhen 518000China 2nd Physics Institute University of StuttgartPfaffenwaldring 5770569 StuttgartGermany Max Planck Institute for Solid State Research Heisenbergstrasse 170569 StuttgartGermany Greater Bay Area Institute for Innovation Hunan UniversityGuangzhou 511300China

Replacing electrons with photons is a compelling route toward high-speed,massively parallel,and low-power artificial intelligence ***,diffractive networks composed of phase surfaces were trained to perform machine learning tasks through linear optical ***,the existing architectures often comprise bulky components and,most critically,they cannot mimic the human brain for ***,we demonstrate a multi-skilled diffractive neural network based on a metasurface device,which can perform on-chip multi-channel sensing and multitasking in the *** polarization multiplexing scheme of the subwavelength nanostructures is applied to construct a multi-channel classifier framework for simultaneous recognition of digital and fashionable *** areal density of the artificial neurons can reach up to 6.25×10^(6)mm^(-2) multiplied by the number of *** metasurface is integrated with the mature complementary metal-oxide semiconductor imaging sensor,providing a chip-scale architecture to process information directly at physical layers for energy-efficient and ultra-fast image processing in machine vision,autonomous driving,and precision medicine.

关键词： visible autonomous complementary

双侧牙槽嵴裂动物模型的建立及对上颌骨生长发育的影响

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中南大学学报（医学版） 2006年第2期31卷 215-217页

作者：欧新荣翦新春中南大学湘雅医院口腔科

目的:建立双侧牙槽嵴裂大动物模型,研究其对上颌骨发育的影响。方法:选用8只1 2周龄的同窝实验犬,随机分成正常对照组和实验动物模型组,对实验组的动物采用外科手术的方法建立裂隙程度一致的双侧上颌牙槽嵴裂,术后1 2周处死动物,通过实... 详细信息

目的:建立双侧牙槽嵴裂大动物模型,研究其对上颌骨发育的影响。方法:选用8只1 2周龄的同窝实验犬,随机分成正常对照组和实验动物模型组,对实验组的动物采用外科手术的方法建立裂隙程度一致的双侧上颌牙槽嵴裂,术后1 2周处死动物,通过实体标本、三维CT等对两组动物行头颅测量。结果:实验模型组牙槽嵴裂裂隙为(1 0.8 1±0.4 1)mm,其上颌骨长度、前部宽度和前部高度较正常对照组明显缩小(P<0.0 5)。结论:牙槽嵴裂对上颌骨生长发育具有一定的影响。

关键词：牙槽嵴裂模型上颌骨生长发育犬

Silicon carbide,the next-generation integrated platform for quantum technology

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Light(Science & Applications) 2024年第10期13卷 1992-1994页

作者： Haiyan ou Department of Electrical and Photonics Engineering Technical University of DenmarkKgs.Lyngby 2800Denmark

Silicon carbide(SiC)is emerging as a promising material platform for quantum photonic integrated circuits(QPICs).A quantum light source is one of the fundamental building blocks for QPICs.A high-performance quantum li... 详细信息

关键词： carbide quantum Silicon

Phosphate rock reduces the bioavailability of heavy metals by influencing the bacterial communities during aerobic composting

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Journal of Integrative Agriculture 2021年第5期20卷 1137-1146页

作者： CUI Hu ou Yang WANG Li-xia YAN Bai-xing LI Ying-xin DING Da-wei Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102P.R.China Jilin Provincial Engineering Center of CWs Design in Cold Region&Beautiful Country Construction Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China

Available information on the microbial mechanisms associated with heavy metal(HM)passivation during co-composting amended with phosphate rock(PR)remains ***,this study investigated the dynamic changes in bacterial communities and HM-fractions(Zn,Cu,Cd,Cr and Pb)during swine manure composting with maize straw,and ascertained the bacterial influence on *** results demonstrated that the addition of PR improved HM-passivation,especially for Zn and Cd,with their bioavailability factors(BFs)reduced by 247.41 and 176.25%,*** for bacterial communities,the proportion of Firmicutes decreased,while the proportions of Proteobacteria,Bacteroidetes,DeinococcusThermus and Gemmatimonadetes increased in all *** significantly changed the primary bacterial phyla in the thermophilic *** were the main bacterial component controlling the passivation of Zn,Cu and Cr,while Deinococcus-Thermus mainly regulated the mobility of Zn and Pb,and Proteobacteria only dominated the transformation among *** results may provide a reference for the use of HM-passivation techniques during composting.

关键词： aerobic composting heavy metals bacterial community phosphate rock