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On the Multi-q.Characteristics of Magnetic Ground States of Honeycomb Cobalt Oxides

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Chinese Physics Letters 2025年第02期 76-86页

作者： Yuchen gu Xianghong Jin Yuan Li International Center for q.antum Materials School of PhysicsPeking University Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of Sciences

The Kitaev honeycomb model has received significant attention due to its exactly solvable q.antum spin liq.id ground states and fractionalized excitations. Layered cobalt oxides have been considered as a promising pla...

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[Effects of adipose stem cell-derived exosomes on rat tendon healing and its impact on the periphery neuropeptides expression]

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Zhonghua yi xue za zhi 2025年第7期105卷 544-553页

作者： H T Xu H Zhang K Shen H Zhou H H Song D M guo X Y gu G L Wang q.Wang G Y Yin Department of Orthopedics the First Affiliated Hospital of Nanjing Medical University Nanjing 210029 China. School of Biological Science and Medical Engineering Southeast University Nanjing 210000 China.

To investigate the effect of injectable adipose tissue stem cell-derived exosome-encapsulated hydrogel on the tendon healing in rats and to evaluate the temporal and spatial expressions of periphery neuropeptides at healing site. To generate the injectable exosome-encapsulated hydrogel, the methacryloylchloride solution (GelMA) and the photoinitiator were mixed first, then the exosome solution was added and oscillated together. Followed with exposing in the ultraviolet light in a wave length 405 nm for 30 seconds to form an injectable hydrogel. The Sprague Dawley (SD) rats were performed with full thickness transection and surgical repair administration of Achilles tendon to establish the animal model, including 4 groups: intact control (C group, selected the contralateral side of tendon transection with surgical repair group), tendon transection with surgical repair group (S group), tendon transection with surgical repair and hydrogel implantation group (H group) and tendon transection with surgical repair and exosome-encapsulated hydrogel group (E group). The samples were harvested on Day 7, 14 and 28 after the operation, respectively. Histopathological examination was performed with hematoxylin-eosin staining (HE staining) and immunohistochemistry staining of tenogenesis marker (Tenomodulin, TNMD), periphery neuropeptide markers (growth associated protein-43, GAP43; S100 calcium-binding protein B, S100B; neuropeptide Y, NPY; calcitonin gene-related peptide, CGRP; Substance P, SP). Morphological property was characterized with tendon length, cross-sectional area (CSA), and gastrocnemius weight ratio. Biomechanical testing was measured with maximum failure load, stiffness and tensile modulus. The results of the q.antitative polymerase chain reaction (q.CR) showed that the expression level of the TNMD gene in the E group was 2.12±0.43, which was significantly higher than that in the H group (1.26±0.28) and the S group (1.21±0.39) (both <0.05). Based on the immunoh

关键词：肌腱脂肪干细胞外泌体可注射水凝胶肌腱愈合外周神经肽

Calculation of Point Defects in NiAl Alloy

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Journal of Materials Science & Technology 1997年第4期13卷 280-283页

作者： Wang, BY Wang, YX gu, q.Wang, TM LANZHOU UNIV DEPT MAT SCILANZHOU 730000PEOPLES R CHINA

The potential functions of the F-S model for ordered high-temperature intermetallic compound NiAl with a B-2 structure are constructed. Using the potential, the point defects properties were studied by molecular dynamics method, the results are in good agreement with that by EAM method and the experiment values. Meanwhile, the results clarify the experiments of two recovery stages in q.enched NiAl alloy, and indicate that the two stages are corresponding to the recovery of Ni vacancies and of Al vacancies.

关键词： Nickel alloys

澳门科学一号卫星对闪电诱发电子沉降现象的首次观测结果

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中国科学:地球科学 2025年第1期55卷 1-9页

作者：王庸平孙翌馨宗秋刚陆高鹏顾旭东胡泽骏李斌中国极地研究中心(中国极地研究所)自然资源部极地科学重点实验室上海200136 北京大学空间物理与应用技术研究所北京100871 澳门科技大学月球与行星科学国家重点实验室中国澳门999078 中国科学技术大学地球和空间科学学院合肥230026 武汉大学电子信息学院武汉430072

中能电子探测器(Medium-energy Electron Spectrometers,MES)是澳门科学一号卫星(Macao Science Satellite-1,MSS-1)上载荷的探测仪器,专门用于监测卫星轨道上的典型带电粒子辐射特征及其发生和发展过程,包括闪电诱发电子沉降现象(Light... 详细信息

中能电子探测器(Medium-energy Electron Spectrometers,MES)是澳门科学一号卫星(Macao Science Satellite-1,MSS-1)上载荷的探测仪器,专门用于监测卫星轨道上的典型带电粒子辐射特征及其发生和发展过程,包括闪电诱发电子沉降现象(Lightning-Induced Electron Precipitation,LEP).本文介绍了MSS-1卫星对LEP的首次观测结果.在初期3个月的运行中,MSS-1卫星共识别出47次LEP事件,全部位于1.5

关键词：闪电诱发电子沉降内辐射带高能电子澳门科学一号卫星(MSS-1)

基于标准工时预测的衬衣部件模块生产编排优化

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纺织学报 2025年第1期46卷 154-162页

作者：盛锡彬赵崧灵顾冰菲浙江理工大学服装学院浙江杭州310018 浙江理工大学数智风格与创意设计研究中心浙江杭州310018 丝绸文化传承与产品设计数字化技术文化和旅游部重点实验室浙江杭州310018

针对模块化智能特性下多品种小批量服装生产系统的快速重构需求,提出一种基于反向传播(BP)神经网络进行模块族工时预测,并用于混合模式部件模块生产编排优化的方法。以企业近几年生产的550款典型衬衫款式为例,基于11类衬衣模块族,通过... 详细信息

针对模块化智能特性下多品种小批量服装生产系统的快速重构需求,提出一种基于反向传播(BP)神经网络进行模块族工时预测,并用于混合模式部件模块生产编排优化的方法。以企业近几年生产的550款典型衬衫款式为例,基于11类衬衣模块族,通过对标准工时影响因素权重分析,构建BP神经网络预测模型。最终对标准工时模型预测效果进行验证,并基于模块族针对2款衬衣实现混合生产线的工序分配。结果表明:各模块族平均绝对误差均在9 s内,且其中8个模块族的误差值未超过5 s;混款生产模式相较于单款式生产编制的效率均在90%以上,采用模块优化的编制效率可达95.55%,且平滑指数降低了50.09%,说明工时预测及模块化工序分配应用效果较好。本文研究结果可一定程度上满足企业混款组合加工的应用要求,为快速报价、制定生产计划提供参考。

关键词：衬衣 BP神经网络标准工时工时预测模块生产流水编排

Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with different prestrain levels

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Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.H.Zhang H.Li Z.W.Yang X.Liu q.F.gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Eq.ipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subseq.ent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,after subseq.ent unloading and heating,a higher density of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation twinning

Electron mass enhancement and magnetic phase separation near the Mott transition in double-layer ruthenates

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Frontiers of physics 2018年第4期13卷 159-165页

作者： Jin Peng X. M. gu G. T. Zhou W. Wang J. Y. Liu Yu Wang Z. q. Mao X. S. Wu Shuai Dong School of Physics Southeast University Nanjing 211189 China Collaborative Innovation Center of Advanced Microstrucutres Lab of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China Department of Physics and Engineering Physics Tulane University New Orleans LA 70118 USA

We present a detailed investigation of the specific heat of Ca3（Ru1-xMx）2O7 （M = Ti, Fe, Mn） single crystals. Depending on the dopant and doping level, three distinct regions are present： a q.asi- two-dimensional metallic state with antiferromagnetic （AFM） order formed by ferromagnetic bilayers （AFM-b）, a Mott insulating state with G-type AFM order （G-AFM）, and a localized state with a mixed AFM-b and G-AFM phase. Our specific heat data provide deep insights into the Mort transitions induced by Ti and Mn doping. We observed not only an anomalous large mass enhancement, but also an additional term in the specific heat, i.e., C ∝ T2, in the localized region. The C ∝ T2 term is most likely due to long-wavelength excitations with both FM and AFM components. A decrease in the Debye temperature is observed in the G-type AFM region, indicating lattice softening associated with the Mott transition.

关键词： specific heat ruthenates Mort insulator phase separation

An approach to form the dome shape by 3D laser forming

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Chinese Optics Letters 2013年第2期11卷 58-61页

作者： q. Nadeem S. J. Na Department of Mechanical Engineering KAISTDaejeon Yuseong-guKorea COMSATS Inst. of IT Quaid VenueThe Mall47040 Wah CanttPakistan

Application of a thermal source in non-contact forming of sheet metal is known for some time. Replacement of this thermal source with a laser beam promises the much greater controllability of the process. To date, research focuses on dealing with rectangular plates, and only a few studies are presented for axis-symmetric geometries like circular plates. This study presents the work to get the dish or bowl shape by an initially flat circular plate. Two different scanning strategies circular and radial are attempted to get the desired dish shape. Following the unexpected distortion throughout the plate, a second series of experiments are conducted on a wide range of specimen geometries. An interesting phenomenon is observed. It is suggested that homogeneous dissemination of heat along with combined form of both of the scanning strategies, could have more potential to form dome shape.

关键词： An approach to form the dome shape by 3D laser forming Figure

Effect of grain size on fatigue cracking at twin boundaries in a CoCrFeMnNi high-entropy alloy

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Journal of Materials Science & Technology 2020年第4期39卷 1-6页

作者： A.G.Wang X.H.An J.gu X.G.Wang L.L.Li W.L.Li M.Song q.q.Duan Z.F.Zhang X.Z.Liao School of Aerospace Mechanical&Mechatronic EngineeringThe University of Sydne0ySydneyAustralia State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Materials Fatigue and Fracture Division Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Max-Planck-Institut für Eisenforschung Max-Planck-Stra?e 140237 DüsseldorfGermany

The fatigue cracking behavior at twin boundaries(TBs)in a Co Cr Fe Mn Ni high-entropy alloy with three different grain sizes was systematically investigated under low-cycle *** of grain size,the change from slip band cracking to TB cracking occurred with increasing the difference in the Schmid factors(DSF)between matrix and ***,the req.ired critical DSF for the transition of the dominant cracking mode decreases with decreasing grain size due to the reduced slip band spacing that increases the impingement sites on the TBs and facilitates the coalescence of defects and voids to initiate TB cracks.

关键词： High-entropy alloy Fatigue cracking Twin boundary Slip band Grain size