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Characteristics on microstructure and mechanical performances of 6111Al influenced by Ce-containing precipitates

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Journal of Rare Earths 2022年第1期40卷 153-160页

作者： xu gao Yutao Zhao Xizhou Kai Wei Qian Liwei Jin Chuang Guan Peng Sheng School of Material Science and Engineering Jiangsu UniversityZhenjiang 212013China

In this work,the effects of Ce addition(0,0.1 wt%,0.3 wt%,0.5 wt%and 0.7 wt%)on the evolution of microstructure and mechanical properties of 6111 Al alloy and strengthening mechanism of 6111 Al-Ce alloy were systematically investigated by a polarizing microscope,a scanning electronic microscope,an energy dispersive spectroscope and a high-resolution transmission electron *** results indicate that with 0.3 wt%Ce addition,theα-Al grains show the equiaxed crystal morphology with the average size decreasing from 137 to 57μm and numerous small AlCeSi phases with lump-like or platelike morphology are distributed closely along the grain *** peak yield strength,ultimate tensile strength and elongation of 6111 Al-Ce alloy reach to 279 MPa,316 MPa and 12.1%,respectively,which is attributed to the grain refinement strengthening and the formation of nanosized Al11Ce3 ***,this investigation gives us instructive suggestion to prepare the new kind of aluminum alloy with high strength and high ductility.

关键词： Grain refinement Precipitation strengthening Orowan strengthening Microstructure Mechanical properties Rare earths

Cu-substitution P2-Na_(0.66)Mn_(1-x)Cu_(x)O_(2) sodium-ion cathode with enhanced interlayer stability

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Journal of Energy Chemistry 2022年第12期75卷 478-485,I0012页

作者： Huanqing Liu xu gao Jun Chen Jinqiang gao Haoji Wang Yu Mei Huan Liu Wentao Deng Guoqiang Zou Hongshuai Hou Xiaobo Ji State Key Laboratory of Powder Metallurgy College of Chemistry and Chemical EngineeringCentral South UniversityChangsha 410083HunanChina School of Materials Science and Engineering Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and ConversionHunan University of Science and TechnologyXiangtan 411201HunanChina

P2-type Mn-based layered oxides are viewed as promising cathode materials for sodium ion battery by virtue of their high theoretical *** that pure Na_(2/3)MnO_(2)suffers from poor cycling performances,Cu-substitution strategy is proposed to effectively alleviate this ***,the structural evolution mechanism of the Cu-containing samples still remains ***,we propose that CuSubstitution P2-type Na_(0.66)Mn_(1-x)Cu_(x)O_(2)with enlarged lattice parameters are conducive to improving the interlayer structure stability through mitigating TMO_(2)slabs *** by synchrotron XAS spectra and ex/in situ XRD,the expansion/contraction of MnO_6 octahedron is dramatically reduced with the increased Cu content,showing the facilitated Na ion ***,when the ratio of Cu to Mn reaches 1:4,the phase transition from P2 to P'2 type at the end of discharge can be suppressed,resulting in the improved interlayer skeleton *** Cu-containing samples with stable interlayer structure exhibit high capacity retention and outstanding rate performances(a capacity of 79.9 m Ah g^(-1)at 5C).This Cu-substitution strategy provides a promising approach to designing highly stable cathodes.

关键词： Sodium-ion battery Manganese-based cathode Cu-substitution In-plane distortion Jahn-Teller effect

有限元法构建退行性脊柱侧弯模型:病因与治疗中的生物力学分析

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中国组织工程研究 2025年第3期29卷 572-578页

作者：贺凯邢文华刘胜祥白贤明周晨高旭乔宇何强高志宇郭圳包阿如汗李查德内蒙古医科大学内蒙古自治区呼和浩特市010110 内蒙古医科大学第二附属医院内蒙古自治区呼和浩特市010020 呼和浩特市第一医院内蒙古自治区呼和浩特市010030

背景:退行性脊柱侧弯是指发生在成年之后,脊柱冠状面Cobb角度>10°伴有矢状面畸形和旋转脱位,常常产生脊髓、神经受压症状,如腰疼、下肢疼痛、麻木、无力、神经源性跛行等。有限元法是一种计算机建模的力学分析技术,通过建立数字化网格... 详细信息

背景:退行性脊柱侧弯是指发生在成年之后,脊柱冠状面Cobb角度>10°伴有矢状面畸形和旋转脱位,常常产生脊髓、神经受压症状,如腰疼、下肢疼痛、麻木、无力、神经源性跛行等。有限元法是一种计算机建模的力学分析技术,通过建立数字化网格模型,能真实还原人类脊柱模型并可进行脊柱力学研究。目的:综述有限元法在退行性脊柱侧弯病因及治疗中的应用。方法:在文献数据库中国知网、PubMed、Web of Science中检索2023年10月之前发表的有关有限元分析法在退行性脊柱侧弯中应用的文献,英文检索词为finite element anaysis,biomechanics,stress analysis,degenerative scoliosis,adult spinal deformity,中文检索词为有限元分析法、生物力学、应力分析、退变性脊柱侧凸、成年性脊柱侧凸。最终纳入文献54篇。结果与结论:①运用有限元法构建的退行性脊柱侧弯模型得出的生物力学研究结果,与体内试验研究结果相同,证明有限元法在退行性脊柱侧弯中具有较高的实用价值;②通过有限元法对退行性脊柱侧弯的病因与治疗进行研究,有利于预防其发生、减缓其进展、制定出更合适的治疗方案、减少手术并发症出现、促进患者术后康复等;③有限元法从材料单一的骨性结构逐渐发展到纳入肌肉韧带等软组织的阶段,且小样本含量越来越无法满足研究需要;④有限元法在退行性脊柱侧弯领域有较大的发展空间。

关键词：退行性脊柱侧弯成人性脊柱侧弯有限元分析法生物力学应力分析综述

Transurethral seminal vesiculoscopy in the diagnosis and treatment of persistent or recurrent hemospermia： a single- institution experience

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Asian Journal of Andrology 2009年第5期11卷 566-570,I0002页

作者： Zhi-Yong Liu Ying-Hao Sun Chuan-Liang xu Jian-Guo Hou xu gao Xin Lu Hua-Mao Ye Lin-Hui Wang Xiao-Feng gao Shanghai Changhai Hospital the Second Military Medical University Shanghai 200433 China

The diagnosis and treatment of hemospermia presents significant difficulty, especially if it persists or recurs. In this retrospective study, we assessed whether transurethral seminal vesiculoscopy is feasible and effective in the diagnosis and treatment of hemospermia. To address this complex condition, we report our experience in a population of patients treated with transurethral seminal vesiculoscopy. From February 2006 to July 2008, 72 hemospermic patients underwent transurethral seminal vesiculoscopy examination and treatment at our urology center. Transurethral seminal vesiculoscopy was performed by a 7-F or 8-F rigid ureteroscope. The endoscopic procedure was conducted through the normal anatomic route of the seminal tracts. In this series, the mean follow-up period was 21.7 months. Definite diagnosis was made for 93.1% patients, and 94.4% patients were cured or showed a decrease in their symptoms. Postoperative complications were not observed in the study. Our study proves that transurethral seminal vesiculoscopy is effective in the diagnosis and treatment of hemospermia with minimal complication.

关键词： diagnosis hemospermia transurethral seminal vesiculoscopy treatment

Fixture Locating Modelling and Optimization Research of Aluminum Alloy Sidewall in a High-Speed Train Body

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Journal of Shanghai Jiaotong university(Science) 2020年第6期25卷 706-713页

作者： WANG Xianjin gao xu YU Kuigang School of Mechanical Engineering Shandong UniversityJinan 250061China Key Laboratory of High Eficiency and Clean Mechanical Manufacturing of Ministry of Education Shandong UniversityJinan 250061China National Demonstration Center for Experimental Mechanical Engineering Education Shandong UniversityJinan 250061China

The high-speed train body is welded with aluminum alloy assemblies or *** to the material properties,the welding deformation is much *** order to control the welding deformation,this paper takes the sidewall welding of a high-speed train body as the research objective,and carries out the fixture locating modelling and optimization research of the aluminum alloy ***,a finite element model of the sidewall is established and verified by the comparison between the analysis results and the actual measurement *** the residual stress and deformation of the sidewall after welding are *** selecting the longitudinal parameters of different fixture locating layouts for welding analysis,models describing the relat ionship between the maximum welding residual stress and maximum welding deformation and the longitudinal fixture locating distance of the sidewall are ***,the fixture locating model of welding deformation is used to optimize the longit udinal fixture locating *** the transverse fixture locating distance is also optimized by comparing different locating *** result shows that the welding residual stress and the welding deformation have been decreased in the optimal fixture locat ing layout.

关键词： aluminum alloy sidewall welding residual stress welding deformation fixture design

Drop strength measurement of green pellet based on drop-rebound mechanism

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Journal of Iron and Steel Research International 2023年第11期30卷 2143-2152页

作者： Jie Lei xu gao Jing-shu An Guang-da Bao Yu-qi Kong Hong-ming Long School of Metallurgical Engineering Anhui University of TechnologyMa’anshan243032AnhuiChina Key Laboratory of Metallurgical Emission Reduction and Resource Comprehensive Utilization Anhui University of TechnologyMa’anshan243032AnhuiChina

The construction of blast furnace charge structure based on pellet and the development of short process from non-blast furnace to electric furnace will be an efficient way to accomplish"carbon peak,carbon neutral".Since drop strength is one of the most crucial quality indexes for green pellet,the crack detection in the collision process is an indispensable segment;however,the present crack determination is basically completed *** to a series of problems including high labor intensity and poor detection conditions,it is urgent to develop an accurate,convenient and fast standardized method for drop strength *** view of the above issues,combined with plenty of experimental studies,it is found that whether rebound occurs after the collision of green ball can be used as the basis for judging if there are cracks on the surface,and the mechanism of this segment is explained by the energy conversion of collision process that the plastic deformation of the collision is a cumulative *** collision will cause a slight displacement of the iron ore particles;until the cumulative displacement exceeds the binding force between the particles,they will slip in a large range,that is,cracks will *** drop strength can be detected based on the drop-rebound mechanism determining crack generation during collision process by high-speed cameras,and the method is fully applicable to oxidized pellets with particle size of 8-16 mm though various pellet plasticities and masses increase the difficulty of bounce height *** on the drop-rebound mechanism of green pellet,three methods for automatically detecting the drop strength are proposed,which are high-speed camera,photoelectric sensor and pressure sensor methods.

关键词： Green pellet Drop strength Collision Rebound Crack

Screening and identification of functional bacterial attachment genes in aerobic granular sludge

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Journal of Environmental Sciences 2024年第7期141卷 205-214页

作者： Kai Qiao Tingting Zhao LeiWang Wei Zhang WeiMeng Fan Liu xu gao Jianrong Zhu School of Environment Beijing Normal UniversityBeijing 100875China State Key Laboratory of Water Simulation Beijing 100875China R&D Centre of Aerobic Granule Technology Beijing 100875China

The screening and identification of attachment genes is important to exploring the formation mechanism of biofilms at the gene *** is helpful to the development of key culture technologies for aerobic granular sludge(AGS).In this study,genome-wide sequencing and gene editing were employed for the first time to investigate the effects and functions of attachment genes in *** the help of whole-genome analysis,ten attachment genes were screened from thirteen genes,and the efficiency of gene screening was greatly ***,two attachment genes were selected as examples to further confirm the gene functions by constructing gene-knockout recombinant mutants of Stenotrophomonas maltophilia;when the two attachment genes were knocked out,the attachment potential was reduced by 50.67%and 43.93%,*** results provide a new theoretical principle and efficient method for the development of AGS from the perspective of attachment genes.

关键词： Attachment gene Genome-wide sequence Gene-knockout Attachment potential Aerobic granular sludge biofilm

A passive wireless surface acoustic wave(SAW)sensor system for detecting warfare agents based on fluoroalcohol polysiloxane film

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Microsystems & Nanoengineering 2024年第1期10卷 67-78页

作者： Yong Pan Cancan Yan xu gao Junchao Yang Tengxiao Guo Lin Zhang Wen Wang State Key Laboratory of NBC Protection for Civil Beijing 102205China Institute of Acoustics Chinese Academy of SciencesBeijing 100190China The School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of SciencesBeijing 100049China

Long-term monitoring of environmental warfare agengts is a challenge for chemical gas *** address this issue,we developed a 433 MHz passive wireless surface acoustic wave(WSAW)gas sensor for dimethyl methylphosphonate(DMMP)*** WSAW gas sensor includes a YZ lithium niobate(LiNbO_(3))substrate with metallic interdigital transducers(IDTs)etched on it,and an antenna was placed near the IDT.A DMMP-sensitive viscoelastic polymer fluoroalcoholpolysiloxane(SXFA)film was prepared on a LiNbO_(3) substrate,and mode modeling coupling was used to optimize the design *** sensor can function properly in an environments between−30℃ and 100℃ with humidity less than 60%*** the wireless transmission distance was within the range of 0-90 cm,the sensor noise increased with distance,and the stability was less than 32°/*** optimizing the film thickness of SXFA,a relationship was observed between sensor sensitivity and film *** the film thickness of SXFA reached 450 nm,the optimal value was *** a distance of 20 cm between the transmitting and receiving antennas,DMMP was detected at different concentrations with the developed WSAW gas *** lower detection limit of DMMP was 0.48 mg/m^(3),the sensitivity of the sensor was 4.63°/(mg/m^(3)),and repeatable performance of the sensor was confirmed.

关键词： film alcohol passive

Inhibition force of precipitates for promoting abnormal grain growth in magnetostrictive Fe83Ga17-(B,NbC) alloy sheets

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Rare Metals 2017年第11期36卷 886-893页

作者： Ji-Heng Li Wen-Lan Zhang Chao Yuan Xiao-Qian Bao xue-xu gao State Key Laboratory of Advanced Metals and Materials University of Science and Technology Beijing 100083 China

Inhibition force of precipitate particles for pro- moting abnormal grain growth in magnetostrictive Feg3Ga17-（B,NbC） alloy sheets was investigated in this study. After a continuous heating and a high-temperature annealing, the Fe83Gat7 ＋ 0.5 at% B alloy sheets do not occur significant abnormal grain growth. Correspondingly, textures of { 111 }〈112〉 and { 100}〈00l〉 in addition to the Goss texture are obtained in the final annealed alloy sheets. By contrast, after the same annealing processes, the size of {110} textured grains is very large in the final annealed Fe83Gaj7 ＋ 0.5 at% NbC alloy sheets due to the abnormal grain growth, which results in a sharp Goss texture. BN precipitates were introduced into Fes3Ga17 ＋ 0.2 at% B alloy sheets by nitriding annealing at 800℃ for 2 min under NH3 atmosphere. The abnormal grain growth of Goss grains is achieved in 0.2 at% B-doped Fe83Ga17 alloy sheets after a high-temperature annealing, which is attributed to the enhanced inhibition force by introducing BN precipitates. During the recrystallization annealing process, Fe2B precipitates is easy to coarsen and decom- pose at high temperature due to the low thermal stability, resulting in a decrease or even disappearance of the inhi- bition force. For NbC and BN precipitates, the thermal stability and hardness of particles are both better than those of Fe2B precipitates, leading to strong inhibition force. Because of the preferred Goss texture, the magnetostriction of 2.05 × 10-4 and 1.81 × 10 4 is obtained in the sec- ondary recrystallized Fe83Gal7 ＋ 0.5 at% NbC and Fes3Gaw ＋ 0.2 at% B alloy sheets, respectively.

关键词： Fe-Ga alloy Magnetostriction Grain growth Inhibition force Precipitates