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Effect of Artificial Cooling Extrusion on Microstructure and Mechanical Properties of Mg–Zn–Y Alloys

Acta Metallurgica Sinica(English le.ters) 2024年第7期37卷 1115-1127页

作者： Qi-Yu liao Da-Zhi Zhao Qi-Chi le.Wen-Xin Hu Yan-Chao Jiang Wei-Yang Zhou liang Ren Dan-Dan li Zhao-Yang Yin School of Materials Science and Engineering Northeastern UniversityShenyang110819China Key Laboratory of Ele.tromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang110819China Key Laboratory of lightweight Structural Materials Liaoning ProvinceNortheastern UniversityShenyang110819China Baotou Research Institute of Rare Earths Baotou014000China

Microstructure and mechanical properties of Mg–Zn–Y alloys with different Zn/Y atomic ratios with or without artificial cooling (AC) extrusion were systematically investigated in this work. The results show that bimodal microstructure consisting of submicron dynamic recrystallized (DRXed) grains with high fraction of low-angle.grain boundaries (LAGBs) and elongated unDRXed grains was formed in Mg_(98.7)Zn_(1)Y_(0.3) alloy with AC extrusion. The AC process effectively limits the growth of precipitated phases, and large amount of nanoscale.precipitates were dynamically precipitated during the extrusion process. AC extrusion could effectually refine the lamellar 14H LPSO phases and inhibit the transition from stacking faults to LSPO phases in Mg_(98)Zn_(1)Y_(1) alloy and the narrow LPSO phase in Mg_(98)Zn_(1)Y_(1)-AC alloy which could promote the nucle.tion of DRXed grains. The AC extrusion significantly improves the strength of Mg–Zn–Y alloys. Owing to AC extrusion, the strength improvement of Mg_(98.7)Zn_(1)Y_(0.3) alloy is mainly attributed to fine grain strengthening, dislocation strengthening, and nano-phases precipitation strengthening. After AC process, more fine grains and nano-phases jointly strengthen the Mg_(98)Zn_(1)Y_(1) alloy. The Mg_(98)Zn_(1)Y_(1) alloy obtains optimal mechanical properties after extrusion at 623 K, with ultimate tensile.strength (UTS) of 406 MPa, yield strength (YS) of 388 MPa, and elongation (EL) of 5.6%.

关键词： Mg-Zn-Y Artificial cooling Extrusion Microstructure Mechanical properties

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Honeycomb-like MoCo alloy on 3D nitrogen-doped porous graphene for efficient hydrogen evolution reaction

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Rare Metals 2024年第3期43卷 1072-1082页

作者： lin-Ping Wang Kuang li Hua-Long Ding le.Xu Chen Huang Jiao-Jiao Zhou Cong-TaoWen Pei-lin Zhang Wei-Wei Wang Lu-Yang Chen Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and TechnologyShanghai200237China State Key Laboratory of High-Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai200050China State Key Laboratory of Chemical Engineering and School of Chemistry and Mole.ular Engineering East China University of Science and TechnologyShanghai200237China

An efficient ele.trocatalyst is indispensable.to significantly reduce energy consumption and accele.ate the conversion efficiency of water *** this work,the honeycomb-like porous MoCo alloy on nitrogen-doped three-dimensional(3D)porous graphene substrate(Mo_(0.3)Co_(0.7)@NPG)has been synthesized from the annealing of layered double.hydroxide(MoCo-LDH@NPG).Especially,the Mo_(0.3)Co_(0.7)@NPG exhibits low hydrogen evolution overpotential of 75 mV(10 mA·cm^(-2))and a Tafel slope of 69.9 mV·dec^(-1),which can be attributed to highly conductive NPG substrate,the unique nanostructure and the synergistic effect of Mo and ***,the Mo_(0.3)Co_(0.7)@NPG can maintain the original morphology and high catalytic activity after 50-h stability *** work proposes a general strategy to synthesize a multi-ele.ent alloy on conductive substrates with high porosity for ele.trocatalytic reaction.

关键词： MoCo alloy Three-dimensional nitrogen-doped porous graphene Hydrogen evolution reaction(HER)

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In-situ SEM characterization of fracture mechanism of TiB/Ti-2Al-6Sn titanium matrix composites after ele.troshocking treatment

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Rare Metals 2024年第6期43卷 2805-2818页

作者： Ya-Ya Wu Jian Zhou Guo-le. Han Yan Wen Zhou Wang li-Qiang Wang Wei-Jie Lv le.Chun Xie lin Hua Hubei Key Laboratory of Advanced Technology for Automotive Components Wuhan University of TechnologyWuhan 430070China Hubei Collaborative Innovation Center for Automotive Components Technology Wuhan 430070China Faculty of Materials and Manufacturing Beijing University of TechnologyBeijing 100124China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

In this article.in-situ scanning ele.tron microscope characterization of the tensile.properties of TiB/Ti-2Al-6Sn titanium matrix composite(TMC)was conducted before and after ele.troshocking treatment(EST).After EST,the tensile.strength increased by 113.2 *** effect of EST on the tensile.strength and fracture behavior of TiB was investigated using in-situ characterization of the fracture morphology and crack propagation path of the matrix and *** EST,TiB fracture introduced cracks that extended into the matrix,resulting in material *** EST,the refined TiB improved the bearing capacity of the matrix,thereby improving TMC ***,after EST,the cracks were introduced into the matrix,and resulting the fracture of matrix *** an increase in the external load,cracks in the matrix were observed to propagate to TiB,and the refined TiB was fractured,detached,and pulle. out,resulting in the formation of *** the propagation path of the main crack after EST showed that the defle.tion angle.of the main crack *** micro structure of the fracture surface indicated that the fracture of the matrix was plastic,whereas that of TiB was *** EST,the size and area of the dimple. increased,confirming the increase in *** results reveale. that the comprehensive mechanical properties of TiB/Ti-2Al-6Sn improved after ***,EST is an efficient method for tailoring the micro structures and mechanical properties of TMCs.

关键词： TiB/Ti-2Al-6Sn In-situ microstructure characterization Tensile.properties Reinforcement Ele.troshocking treatment(EST)

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Circ_0012152 Accele.ates Acute Myeloid le.kemia Progression through the miR-652-3p/SOX4 Axis

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Current Medical Science 2024年第3期44卷 611-622页

作者： Ying CHEN Bi-xia li Ting-ting NIU Shu-jun YANG li-chao WU le.huai SHI Duo-bing ZOU Ning-ning WU li-xia SHENG Xiao YAN Gui-fang OUYANG Qi-tian MU Laboratory of Stem Cell Transplantation The First Affiliated Hospital of Ningbo UniversityNingbo315300China Ningbo Clinical Research Center For Hematologic Malignancies Ningbo315300China Department of Hematology The First Affiliated Hospital of Ningbo UniversityNingbo315300China School of Medicine Hangzhou City UniversityZhejiang UniversityHangzhou310000China Key Laboratory of Precision Medicine for Atheroscle.otic Diseases of Zhejiang Province Ningbo315300China

Objective Acute myeloid le.kemia(AML)is an aggressive hematological malignancy characterized by abnormal myeloid blast *** studies have demonstrated that circular RNAs play a role.in AML *** this study,we aimed to investigate the clinical significance of circ_0012152 in AML and elucidate its underlying mole.ular mechanism in the pathogenesis of this *** Circ_0012152 expression was detected by quantitative real-time polymerase chain reaction in sample. obtained from 247 patients with AML and 40 healthy controls.A systematic analysis of clinical characteristics and prognostic factors was also *** growth was assessed using the Cell Counting Kit-8(CCK-8)assay,and apoptosis and cell cycle.progression were evaluated by flow ***,RNA pull-down was performed to identify target microRNAs,and transcriptome RNA sequencing and bioinformatics analyses were utilized to identify downstream mRNA *** Circ_0012152 was significantly upregulated in sample. from patients with AML and served as an independent adverse prognostic factor for overall survival(OS)(hazard ratio:2.357;95%confidence interval 1.258–4.415).The circ_0012152 knockdown reduced cell growth,increased apoptosis,and inhibited cell cycle.progression in AML cell *** pull-down and sequencing identified miR-652-3p as a target microRNA of circ_*** growth inhibition by circ_0012152 knockdown was significantly relieved by miR-652-3p *** suggested that miR-652-3p targeted SOX4,as the decrease in SOX4 expression resulting from circ_0012152 knockdown was upregulated by miR-652-3p inhibitors in AML *** Circ_0012152 is an independent poor prognostic factor for OS in AML,and it promotes AML cell growth by upregulating SOX4 through miR-652-3p.

关键词： acute myeloid le.kemia circ_0012152 miR-652-3p SOX4 cell growth

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An Analysis of the Fragmentation of Observing Time At the Muztagh-Ata Site

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Research in Astronomy and Astrophysics 2024年第3期24卷 29-33页

作者： Wen-Bo Gu Jing Xu Guo-Jie Feng Xuan Zhang le.Tian Wang Xin-liang Wang Ali Esamdin li-Xian Shen Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 83001lChina School of Astronomy and Space Science University of Chinese Academy of SciencesBeijing 100049China

Cloud cover plays a pivotal role.in assessing observational conditions for astronomical *** for the fraction of observing time,its fragmentation also wields a significant influence on the quality of nighttime sky *** this article.we introduce the functionΓ∈[0,1],designed to comprehensively capture both the fraction of available.observing time and its *** in situ measurement data gathered at the Muztagh-Ata site between 2017 and 2021,we showcase the effectiveness of our *** statistical result illustrates that the Muztagh-Ata site affords approximately 122 nights that were absolutely cle.r and 205 very good nights annually,corresponding toΓ≥0.9 andΓ≥0.36 respectively.

关键词： site testing-atmospheric effects-methods statistical

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Energy band modulation of N-doped rutile.anatase TiO_(2) photoanode promoting charge separation toward prominent photoele.trochemical performance

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Rare Metals 2024年第8期43卷 3784-3797页

作者： Juan Gao Shi-Xuan Wang Jia-le.Deng Ping-Ping Wei Fu-Zhang Chen ling-Cheng Zheng Yue-Qin Wang Yang li Yin liu Gang He School of Mechanics and Photoele.tric Physics Anhui University of Science and TechnologyHuainan 232001China School of Materials Science and Engineering Anhui UniversityHefei230039China Tianneng Battery(Wuhu)Co. Ltd.Wuhu 241000China School of Materials Science and Engineering Anhui University of Science and TechnologyHuainan 232001China

To solve the proble. of high photogenerated carrier recombination rate and low photoele.tric conversion efficiency of TiO_(2)-based materials,a simple.N-doped anatase/rutile.TiO_(2) heterophase nanorod film was designed by a low-temperature hydrothermal method in this *** enhanced separation and transport of photogenerated charges were facilitated by the smalle. contact barrier and appropriate band matching between anatase TiO_(2)nanoparticle. and rutile.TiO_(2) *** introduction of N doping in anatase TiO_(2) resulted in an upward shift of the vale.ce band and a narrowing of the band gap,consequently enhancing the efficiency of visible.light *** combination of the heterophase junction and N-doping exhibited a synergistic effect,effectively suppressing the recombination of photogenerated charges and enhancing the photoele.tric conversion efficiency of the *** AM 1.5G irradiation,the photocurrent density(J)of the A-TO(N)@R-TONR photoanode reached2.19 mA·cm^(-2)(V_(RHE,1.23 eV)).Additionally,the incident photon-ele.tron conversion efficiency(IPCE)and the charge injection efficiency(η)reached 81.4%and 51.6%at320 ***,the J,IPCE,andηvalues of the A-TO(N)@R-TONR photoanode were 2.96,2.1 and 3.2times those of pure R-TONR photoanode,*** work presents a rational strategy for designing efficient TiO_(2)-based photoanodes.

关键词： TiO_(2) Heterophase junction Photoanode

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Fle.ible.capacitive pressure sensor based on interdigital ele.trodes with porous microneedle.arrays for physiological signal monitoring

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Nanotechnology and Precision Engineering 2024年第1期7卷 18-31页

作者： Jiahui Xu Minghao Wang Minyi Jin Siyan Shang Chuner Ni Yili Hu Xun Sun Jun Xu Bowen Ji le.li Yuhua Cheng Gaofeng Wang School of Ele.tronics&Information MOE Engineering Research Center of Smart Microsensors and MicrosystemsHangzhou Dianzi UniversityHangzhou 310018China Wenzhou Institute of Hangzhou Dianzi University Wenzhou 310018China Key Laboratory of Intelligent Operation and Maintenance Technology&Equipment for Urban Rail Transit of Zhejiang Province College of EngineeringInstitute of Precision Machinery and Smart StructureZhejiang Normal UniversityJinhua 321004China Institute of Guizhou Aerospace Measuring and Testing Technology Guiyang 550009China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

Fle.ible.pressure sensors have many potential applications in the monitoring of physiological signals because of their good biocompatibil-ity and ***,their relatively low sensitivity,linearity,and stability have hindered their large-scale.commercial ***,aﬂexible.capacitive pressure sensor based on an interdigital ele.trode structure with two porous microneedle.arrays(MNAs)is *** porous substrate that constitutes the MNA is a mixed product of polydimethylsiloxane and *** to its porous and interdigital structure,the maximum sensitivity(0.07 kPa-1)of a porous MNA-based pressure sensor was found to be seven times higher than that of an imporous MNA pressure sensor,and it was much greater than that of aﬂat pressure sensor without a porous MNA ***-ele.ent analysis showed that the interdigital MNA structure can greatly increase the strain and improve the sensitivity of the *** addition,the porous MNA-based pressure sensor was found to have good stability over 1500 loading cycle. as a result of its bilayer paryle.e-enhanced conductive ele.trode *** importantly,it was found that the sensor could accurately monitor the motion of aﬁnger,wrist joint,arm,face,abdomen,eye,and Adam’s ***,preliminary semantic recognition was achieved by monitoring the movement of the Adam’s ***,multiple.pressure sensors were integrated into a 33 array to detect a spatial pressure distribu-×*** to the sensors reported in previous works,the interdigital ele.trode structure presented in this work improves sensitivity and stability by modifying the ele.trode layer rather than the diele.tric layer.

关键词： Capacitive pressure sensor Microneedle.array Porous PDMS Interdigital ele.trode

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High recorded color rendering performance of single.structured Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)phosphor ceramics for high-power white le.s/LDs

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Journal of Advanced Ceramics 2024年第6期13卷 810-820页

作者： Xuanchu liu Congcong Yang Yanbin li Chang Min Jian Kang Tianyuan Zhou Chunming Zhou Chaofan Shi Cen Shao Bingheng Sun Wieslaw Strek Hao Chen le.Zhang Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronics EngineeringJiangsu Normal UniversityXuzhou 221116China Jiangsu Xiyi Advanced Materials Research Institute of Industrial Technology Xuzhou 221400China Xuzhou EAGle. Technology Co. Ltd.Xuzhou 221116China Xuzhou Kangna Advanced Materials Technology Co. Ltd.Xuzhou 221116China Shanghai Institute of Optics Fine Mechanics Chinese Academy of SciencesShanghai 201800China Institute of Low Temperature and Structure Research Polish Academy of SciencesWroclaw 50-422Poland State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100China

Achieving a high color rendering index(CRI)and luminous stability in single.structured Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs)is crucial for high-power white light-emitting diodes or laser diodes(le.s/LDs).However,cyan valle.s and insufficient amounts of the red component in the Ce:YAG emission spectra significantly limit their real *** this work,a series of Ce,Mn:Y_(3)(Al,Sc)_(2)Al_(3)O_(12)(Ce,Mn:YSAG)PCs were fabricated by vacuum sintering,and efficient spectral regulation was realized for full-color *** cyan valle. was fille. by the blueshifted emission peak of Ce^(3+)via Sc^(3+)*** orange‒red emission at approximately 580 nm was effectively supple.ented via Mn^(2+)*** particular,CRI of Ce,Mn:YSAG increased from 56.4 to 85.8,a 52%increase compared with that of Ce:YAG under high-power le. excitation,and the operating temperature was stable.at approximately 50℃for long working ***,CRI of 80.9 could still be obtained for PC-based white *** results indicated that Ce,Mn:YSAG PC,which has excelle.t CRI and luminous stability,is an extremely promising color convertor for high-power white le.s/LDs.

关键词： color rendering index(CRI) color converter Ce:Y_(3)Al_(5)O_(12)(Ce:YAG)phosphor ceramics(PCs) high-power white light-emitting diodes or laser diodes(le.s/LDs) luminous stability

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Exploration of the Curriculum Reform Path in the Period of High-Quality Development of University Educational Psychology

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Journal of Contemporary Educational Research 2024年第7期8卷 75-81页

作者： Chunyang Gao le.li Xuetong Zhao Baicheng Normal University Baicheng 137000Jilin ProvinceChina Baicheng Committee of the Chinese People.s Political Consultative Conference Baicheng 137000Jilin ProvinceChina

The theoretical and applied characteristics of educational psychology courses in colle.es and universities are prominent,and actively promoting curriculum reform is more conducive to promoting the imple.entation of tale.t training goals,which is in line with the practical needs of social development for high-quality ***,curriculum reform is a systematic project,which involves the innovation of curriculum content systems,teaching methods,teaching evaluations,and so *** paper mainly expounds on the curriculum reform path in the period of high-quality development of educational psychology in colle.es and universities,hoping to play a reference role.in improving the le.el of education management.

关键词： Educational psychology High-quality development Courses Reform path

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Mutual regulation of microglia and astrocytes after Gas6 inhibits spinal cord injury

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Neural Regeneration Research 2025年第2期20卷 557-573页

作者： Jiewen Chen Xiaolin Zeng le.Wang Wenwu Zhang Gang li Xing Cheng Peiqiang Su Yong Wan Xiang li Department of Spine Surgery The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong ProvinceChina Guangdong Province Key Laboratory of Orthopedics and Traumatology GuangzhouGuangdong ProvinceChina

Invasive inflammation and excessive scar formation are the main reasons for the difficulty in repairing nervous tissue after spinal cord *** and astrocytes play key role. in the spinal cord injury micro-environment and share a close ***,the mechanisms involved remain *** this study,we found that after spinal cord injury,resting microglia(M0)were polarized into pro-inflammatory phenotypes(MG1 and MG3),while.resting astrocytes were polarized into reactive and scar-forming *** expression of growth arrest-specific 6(Gas6)and its receptor Axl were significantly down-regulated in microglia and astrocytes after spinal cord *** vitro experiments showed that Gas6 had negative effects on the polarization of reactive astrocytes and pro-inflammatory microglia,and even inhibited the cross-regulation between *** further demonstrated that Gas6 can inhibit the polarization of reactive astrocytes by suppressing the activation of the Yes-associated protein signaling ***,in turn,inhibited the polarization of pro-inflammatory microglia by suppressing the activation of the nucle.r factor-κB/p65 and Janus kinase/signal transducer and activator of transcription signaling *** vivo experiments showed that Gas6 inhibited the polarization of pro-inflammatory microglia and reactive astrocytes in the injured spinal cord,thereby promoting tissue repair and motor function ***,Gas6 may play a role.in the treatment of spinal cord *** can inhibit the inflammatory pathway of microglia and polarization of astrocytes,attenuate the interaction between microglia and astrocytes in the inflammatory microenvironment,and thereby alle.iate local inflammation and reduce scar formation in the spinal cord.

关键词： astrocytes Axl cell polarization Gas6 Hippo signal inflammatory micro-environment intercellular interaction microglia single.cell sequencing spinal cord injury

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