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Preparation of tungsten-particle-reinforced Zr-based bulk metallic glass composites by two-step spark plasma sintering:microstructure evolution,densification mechanism and mechanical properties

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Rare Metals 2024年第4期43卷 1793-1808页

作者： Yun-Fei ma Pan Gong mao Zhang Hui-EHu Zhen Peng Xiao Xu Xin Wang Mehdi malekan Xue-Feng Tang Lei Deng Jun-Song Jin Xin-Yun Wang State Key Laboratory of materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen518057China Department of Chemistry and materials Naval University of EngineeringWuhan430032China School of materials Science and Engineering Jiangsu UniversityZhenjiang212013China College of machine Shanghai Dianji UniversityShanghai201306China School of Metallurgy and materials Engineering College of EngineeringUniversity of TehranTehran 11155-4563Iran

A new two-step spark plasma sintering(TSS)process with low-temperature pre-sintering and high-temperature final sintering has been successfully applied to prepare the tungsten-particle(Wp)-reinforced bulk metallic glass composites(Wp/BMGCs).Compared to normal spark plasma sintering(NS),the densification rate and relative density of Wp/BMGCs can be improved by selecting TSS with appropriate sintering pressure in the low temperature pre-sintering ***,the compressive strength and plastic strain of 30%Wp/BMGCs prepared by TSS are both higher than those of the samples prepared by *** TSS process can significantly enhance the compressive strength of 30%Wp/BMGCs by 12%and remarkably increase the plastic strain by 50%,while the trend is completely opposite for 50%Wp/***-in situ experiments and finite element simulations reveal that uneven temperature distribution among particles during low-temperature pre-sintering causes local overheating at contact points between particles,accelerating formation of sintering neck between particles and plastic deformation of *** the volume fraction of Wp is low,TSS can improve the interface bonding between particles by increasing the number of sintering *** makes the fracture mode of Wp/BMGCs being predominantly transgranular ***,as the volume fraction of Wp increases,the adverse effects of Wp plastic deformation are becoming more and more *** aggregated Wp tends to form a solid"cage structure"that hinders the bonding between particles at the interface;correspondingly,the fracture behavior of Wp/BMGCs is mainly dominated by intergranular ***,reducing the sintering pressure during the low-temperature pre-sintering stage of TSS has been shown to effectively decrease plastic deformation in Wp,resulting in a higher degree of densification and better mechanical properties.

关键词： Bulk metallic glass composites Tungsten particle Two-step spark plasma sintering Densification mechanism Mechanical properties

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Co-doped BaFe_(2)As_(2) Josephson junction fabricated with a focused helium ion beam

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Chinese Physics B 2024年第4期33卷 181-186页

作者：陈紫雯张焱马平徐中堂李宇龙王越路建明马衍伟甘子钊 Applied Superconductivity Research Center Peking UniversityBeijing 100871China State Key Laboratory for Artificial Microstructure and Mesoscopic Physics Peking UniversityBeijing 100871China Institute of Condensed matter Physics School of PhysicsPeking UniversityBeijing 100871China Yangtze Delta Institute of Optoelectronics Peking UniversityBeijing 100871China Key Laboratory of Applied Superconductivity Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China

Josephson junction plays a key role not only in studying the basic physics of unconventional iron-based superconductors but also in realizing practical application of thin-film based devices,therefore the preparation of high-quality iron pnictide Josephson junctions is of great *** this work,we have successfully fabricated Josephson junctions from Co-doped BaFe_(2)As_(2)thin films using a direct junction fabrication technique which utilizes high energy focused helium ion beam(FHIB).The electrical transport properties were investigated for junctions fabricated with various He^(+)irradiation *** junctions show sharp superconducting transition around 24 K with a narrow transition width of 2.5 K,and a dose correlated foot-structure resistance which corresponds to the effective tuning of junction properties by He^(+)*** J_c suppression by more than two orders of magnitude can be achieved by increasing the He^(+)irradiation dose,which is advantageous for the realization of low noise ion pnictide thin film *** Shapiro steps are observed under 10 GHz microwave *** above results demonstrate the successful fabrication of high quality and controllable Co-doped BaFe_(2)As_(2)Josephson junction with high reproducibility using the FHIB technique,laying the foundation for future investigating the mechanism of iron-based superconductors,and also the further implementation in various superconducting electronic devices.

关键词： focused helium ion beam Co doped BaFe_(2)As_(2) Josephson junction

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Mode-switchable dual-color infrared quantum cascade detector

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Photonics Research 2024年第2期12卷 253-259页

作者： YIXUAN ZHU SHENQIANG ZHAI KUN LI kai GUO QIANGQIANG GUO JINCHUAN ZHANG SHUmaN LIU LIJUN WANG FENGQI LIU JUNQI LIU Key Laboratory of Semiconductor materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China

In this paper,a patch-antenna-array enhanced quantum cascade detector with freely switchable operating modes among mid-wave,long-wave,and dual-color was proposed and *** dual-color absorption occurs in a single active region through an optimized coupled miniband diagonal-transition subbands arrangement,and a successful separation of the operation regimes was realized by two nested antenna arrays with different patch sizes up to room *** 77 K,the 5.7-μm channel achieved a peak responsivity of 34.6 ma/W and exhibited a detectivity of 2.0×10^(10)Jones,while the 10.0-μm channel achieved a peak responsivity of 87.5 ma/W,giving a detectivity of 5.0×10^(10)*** a polarization modulation of the incident light,the minimum cross talk of the mid-wave and the long-wave operating modes was 1:22.5 and 1:7.6,*** demonstration opens a new prospect for multicolor infrared imaging chip integration technology.

关键词： antenna polarization quantum

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Detecting the core of a network by the centralities of the nodes

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Chinese Physics B 2024年第8期33卷 615-621页

作者：马佩杰任学藻朱军芳蒋艳群 School of mathematics and Science Southwest University of Science and TechnologyMianyang 621010China

many networks exhibit the core/periphery ***/periphery structure is a type of meso-scale structure that consists of densely connected core nodes and sparsely connected peripheral *** nodes tend to be well-connected,both among themselves and to peripheral nodes,which tend not to be well-connected to other *** this brief report,we propose a new method to detect the core of a network by the centrality of each *** is discovered that such nodes with non-negative centralities often consist in the core of the *** simulation is carried out on different real *** results are checked by the objective *** checked results may show the effectiveness of the simulation results by the centralities of the nodes on the real ***,we discuss the characters of networks with the single core/periphery structure and point out the scope of the application of our method at the end of this paper.

关键词： complex network core/periphery structure the objective function

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Risk assessment,fitness cost,cross-resistance,and mechanism of tetraniliprole resistance in the rice stem borer,Chilo suppressalis

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Insect Science 2024年第3期31卷 835-846页

作者： Hao Sun Shuai Wang Chong Liu Wen-kai Hu Jin-Wei Liu Ling-Jun Zheng Meng-Yue Gao Fang-Rui Guo Song-Tao Qiao Jun-Li Liu Bo Sun Cong-Fen Gao Shun-Fan Wu College of Plant Protection Nanjing Agricultural UniversityState&Local Joint Engineering Research Center of Green Pesticide Invention and ApplicationNanjingChina Bayer Cropscience(China)Co. Ltd.HangzhouChina

The rice stem borer(RSB),Chilo suppressalis,a notorious rice pest in China,has evolved a high resistance level to commonly used ***,a new anthranilic diamide insecticide,effectively controls multiple pests,including ***,the potential resistance risk of RSB to tetraniliprole is still *** this study,the tetraniliprole-selection(Tet-R)strain was obtained through 10 continuous generations of selection with tetraniliprole 30%lethal concentration(LC_(30)).The realized heritability(h^(2))of the Tet-R strain was 0.387,indicating that resistance of RSB to tetraniliprole developed rapidly under the continuous selection of *** Tet-R strain had a high fitness cost(relative fitness=0.53).We established the susceptibility baseline of RSB to tetraniliprole(lethal concentration at LC_(50)=0.727 mg/L)and investigated the resistance level of 6 field populations to *** tested strains that had resistance to chlorantraniliprole exhibited moderate-to high-level resistance to tetraniliprole(resistance ratio=27.7-806.8).Detection of ryanodine receptor(RyR)mutations showed that the Y4667C,Y4667D,I4758M,and Y4891F mutations were present in tested RSB field *** mutations were responsible for the cross-resistance between tetraniliprole and ***,the clustered regularly interspaced palindromic repeats(CRISPR)/CRISPR-associated protein 9-mediated genome-modified flies were used to study the contribution of RyR mutations to tetraniliprole *** order of contribution of a single RyR mutation to tetraniliprole resistance was Y4667D>G4915E>Y4667C~~I4758M>*** addition,the I4758M and Y4667C double mutations conferred higher tetraniliprole resistance than single Y4667C *** results can guide resistance management practices for diamides in RSB and other arthropods.

关键词： Chilo suppressalis diamide resistance fitness cost cross-resistance RyR target-site mutations

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氧化石墨烯强化银镀层的耐蚀性和耐磨性研究

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电镀与精饰 2024年第5期46卷 11-19页

作者：刘凯沈喜训马祥孙鹏徐群杰上海电力大学环境与化学工程学院上海200090 上海市电力材料防护与新材料重点实验室上海200090 上海热交换系统节能工程技术研究中心上海200090 上海航天信息研究所上海201109

为满足电连接器在服役过程中对导电银镀层的耐蚀性和耐磨性的需求,本文基于5,5-二甲基乙内酰脲作为主络合剂的无氰镀银溶液,通过添加氧化石墨烯纳米片,采用直流电沉积在铜基材表面制备了银-氧化石墨烯复合镀层。采用光学显微镜、扫描电... 详细信息

为满足电连接器在服役过程中对导电银镀层的耐蚀性和耐磨性的需求,本文基于5,5-二甲基乙内酰脲作为主络合剂的无氰镀银溶液,通过添加氧化石墨烯纳米片,采用直流电沉积在铜基材表面制备了银-氧化石墨烯复合镀层。采用光学显微镜、扫描电子显微镜、能谱仪、X射线衍射仪对镀层表面形貌、成分和晶体结构进行了表征,并通过电化学实验和摩擦磨损试验对复合镀层的耐蚀性和耐磨性进行了测试。结果表明,氧化石墨烯的掺入改变了银的晶体生长方向,并细化了组织,提高了银镀层的硬度、耐蚀性与耐磨性。

关键词：银基复合镀层氧化石墨烯电镀耐磨性耐蚀性

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Hydrogen production from hydrolysis of NaBH_(4) solution over Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst

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Rare Metals 2024年第6期43卷 2648-2659页

作者： Yan Wang Jia-Xin ma Jian Ren Di Zhang Feng-Yan Xu Ke Zhang Zhong-Qiu Cao Qiu-Ju Sun Guo-De Li Shi-Wei Wu Hong-Hui Chen College of Chemistry and Chemical Engineering Shenyang Normal UniversityShenyang 110034China Experimental Center Shenyang Normal UniversityShenyang 110034China Hunan Shande Energy Storage New materials Research Institute Limited Company Changde 415000China

In this study,the double loaded Co-Fe-B@g-C_(3)N_(4)/NF(NF:Ni foam)thin film catalysts were prepared for the first time via chemical deposition method at room *** optimizing the reducing agent concentration to 0.9 mol·L^(-1),the as-obtained Co-Fe-B@g-C_(3)N_(4)/NF exhibited the twisted ribbon structure with more distinct three-dimensional hierarchy and the smaller particle size,showing the good catalytic property for the hydrolysis of NaBH_(4)*** H_(2)generation rate of Co-Fe-B@g-C_(3)N_(4)/NF and binary Co-B@g-C_(3)N_(4)/NF under visible light irradiation surpassed the value under natural *** apparent activation energy of Co-Fe-B@g-C_(3)N_(4)/NF(45.0 kJ·mol^(-1))under visible light irradiation was obviously reduced when compared with the natural condition(48.4 kJ·mol^(-1))and binary Co-B@g-C_(3)N_(4)/NF(60.6 kJ·mol^(-1))under visible light ***,the catalytic performance of the optimized Co-Fe-B@g-C_(3)N_(4)/NF thin film catalyst was superior to most of the reported non-noble metal and even noble metal ***,it illustrated that the catalytic H_(2)production performance of Co-Fe-B@g-C_(3)N_(4)/NF thin film was distinctly improved after the introduction of light and multicomponent recombination.

关键词： Sodium borohydride Co-Fe-B@g-C_(3)N_(4)/NF catalyst Chemical deposition Hydrogen production

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The water-soluble TF3 component from Eupolyphaga sinensis Walker promotes tibial fracture healing in rats by promoting osteoblast proliferation and angiogenesis

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Journal of Traditional Chinese Medical Sciences 2024年第2期11卷 245-254页

作者： Binghao Shao Xing Chen Jin'ge Du Shuang Zou Zhaolong Chen jing Wang Huaying Jiang Ruifang Lu Wenlan Wang Chunmei Wang School of Life Sciences Beijing University of Chinese MedicineBeijing102488China School of materia Medica Beijing University of Chinese MedicineBeijing102488China King's British Heart Foundation Center School of Cardiovascular and Metabolic Medicine and SciencesLondonSE59NUUK

Objective To determine the active components of Eupolyphaga sinensis Walker(Tu Bie Chong)and explore the mechanisms underlying its fracture-healing *** A modified Einhorn method was used to develop a rat tibial fracture *** of bone healing was assessed using radiological *** O/fast green and CD31 immunohistochemical staining were performed to evaluate the growth of bone cells and angiogenesis at the fracture *** blue and wound healing assays were used to analyze cell viability and *** Transwell assay was used to explore the invasion capacity of the *** formation assays were used to assess the angiogenesis capacity of human vascular endothelial cells(HUVECs).qRT-PCR was used to evaluate the changes in gene transcription *** Tu Bie Chong fraction 3(TF3)significantly shortened the fracture healing time in model rats.X-ray results showed that on day 14,fracture healing in the TF3 treatment group was significantly better than that in the control group(P=.0086).Tissue staining showed that cartilage growth and the number of H-shaped blood vessels at the fracture site of the TF3 treatment group were better than those of the control *** vitro,TF3 significantly promoted the proliferation and wound healing of MC3T3-E1s and HUVECs(all Pmation experiments confirmed that TF3 markedly promoted the ability of vascular endothelial cells to form *** expression analysis revealed that TF3 significantly promoted the expression of VEGFA,SPOCD1,NGF,and NGFR in *** MC3T3-E1 cells,the transcript levels of RUNX2 and COL2A1 were significantly elevated following TF3 *** TF3 promotes fracture healing by promoting bone regeneration associated with the RUNX2 pathway and angiogenesis associated with the VEGFA pathway.

关键词： Tu Bie Chong Water-solube component Fracture Rats Osteoblast Angiogenesis

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一种增强型稠密连接网络模型应用于ECT图像重建

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振动与冲击 2024年第10期43卷 82-88页

作者：马敏孙妮中国民航大学电子信息与自动化学院天津300300

针对传统神经网络在电容层析成像图像重建中,存在难以较好地实现电容特征张量的底层位置特征和顶层语义特征融合的问题,提出了一种增强型稠密连接网络模型(enhanced dense connectivity network,EDC-net)。首先,训练全连接神经网络获得... 详细信息

针对传统神经网络在电容层析成像图像重建中,存在难以较好地实现电容特征张量的底层位置特征和顶层语义特征融合的问题,提出了一种增强型稠密连接网络模型(enhanced dense connectivity network,EDC-net)。首先,训练全连接神经网络获得初步介电常数分布,利用全连接神经网络的输出特征图作为补偿型U-net网络的输入。其次,搭建补偿型U-net网络,在编码和解码器间添加类DenseNet结构的稠密跳跃连接机制,以保留大量的底层位置特征信息,减少模型多个输出节点的特征损失;同时利用多尺度密集空洞卷积模块替代补偿型U-net中普通卷积,扩大模型的感受野并丰富多尺度信息。最后采用高效通道注意力机制模块实现子解码器节点的输出特征跨通道交互,增强模型对重要信息的关注度,提高模型的非线性拟合能力。试验结果表明,与Landweber迭代算法、U-net算法对比,基于EDC-net算法的重建图像分辨率高,成像边缘清晰,且更具鲁棒性。

关键词：电容层析成像图像重建稠密跳跃连接特征跨通道交互

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975 nm multimode semiconductor lasers with high-order Bragg diffraction gratings

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Journal of Semiconductors 2024年第3期45卷 38-44页

作者： Zhenwu Liu Li Zhong Suping Liu Xiaoyu ma National Engineering Research Center for Optoelectronic Devices Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of materials Sciences and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

The 975 nm multimode diode lasers with high-order surface Bragg diffraction gratings have been simulated and calcu-lated using the 2D finite difference time domain(FDTD)algorithm and the scattering matrix method(SMM).The periods and etch depth of the grating parameters have been optimized.A board area laser diode(BA-LD)with high-order diffraction grat-ings has been designed and *** output powers up to 10.5 W,the measured spectral width of full width at half maxi-mum(FWHM)is less than 0.5 *** results demonstrate that the designed high-order surface gratings can effectively nar-row the spectral width of multimode semiconductor lasers at high output power.

关键词： laser diodes distributed Bragg reflector high order gratings high power laser diodes narrow spectrum width

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