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B2-CuZr reinforced amorphous alloy matrix composites:A review

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China Foundry 2025年第1期22卷 1-11页

作者： Wei Guo Run-hua Huang Zhen Zhang Mi Zhao jin-cheng Wang yan-qiang qiao Shu-lin Lü Shu-sen Wu State Key Lab of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Aerospace Engineering Huazhong University of Science and TechnologyWuhan 430074China Research Institute of Huazhong University of Science and Technology in Shenzhen Shenzhen 518057GuangdongChina

B2-CuZr phase reinforced amorphous alloy matrix composites has become one of the research hotspots in the field of materials science due to the“transformation-induced plasticity”phenomenon,which makes the composites show better macroscopic plastic deformability and obvious work-hardening behavior compared to the conventional amorphous alloy matrix composites reinforced with ductile ***,the in-situ metastable B2-CuZr phase tends to undergo eutectoid decomposition during solidification,and the volume fraction,size,and distribution of B2-CuZr phase are difficult to control,which limits the development and application of these *** date,much efforts have been made to solve the above problems through composition optimization,casting parameter tailoring,and post-processing *** this study,a review was given based on relevant studies,focusing on the predictive approach,reinforcing mechanism,and microstructure tailoring methods of B2-CuZr phase reinforced amorphous alloy matrix *** research focus and future prospects were also given for the future development of the present composite system.

关键词： amorphous alloy matrix composite B2-CuZr phase plasticity microstructure tailoring

Sex differences in human pre-gastrulation embryos

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Science China(Life Sciences) 2025年第2期68卷 397-415页

作者： Yongjie Lu Meng Qin Xintong Qi Ming yang Fan Zhai Jiaqi Zhang Zhiqiang yan Liying yan Jie qiao Peng Yuan State Key Laboratory of Female Fertility Promotion Center for Reproductive MedicineDepartment of Obstetrics and GynecologyPeking University Third HospitalBeijing 100191China National Clinical Research Center for Obstetrics and Gynecology(Peking University Third Hospital) Beijing 100191China Key Laboratory of Assisted Reproduction(Peking University) Ministry of EducationBeijing 100191China Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology Beijing 100191China Academy for Advanced Interdisciplinary Studies Peking UniversityBeijing 100871China

Human fetuses exhibit notable sex differences in growth rate and response to the intrauterine environment,yet their origins and underlying mechanisms remain ***,we conduct a detailed investigation of sex differences in human pre-gastrulation *** lower methylation and incomplete inactivation of the X chromosome in females,as well as the sex-specific cell-cell communication patterns,contribute to sex-differential *** trophectoderm is more inclined toward syncytiotrophoblast differentiation and exhibits a stronger hormone secretion capacity,while female trophectoderm tends to retain cytotrophoblast program with stronger mitochondrial function as well as higher vasculogenesis and immunotolerance *** primitive endoderm initiates the anterior visceral endoderm transcriptional program earlier than *** cell cycle activities of the epiblast and primitive endoderm are higher in males compared to females,while the situation is opposite in the *** conclusion,our study provides in-depth insights into the sex differences in human pre-gastrulation embryos and contributes to unraveling the origins of the sex differences in human fetal development.

关键词： human embryo sex difference trophectoderm primitive endoderm epiblast

Phonon-mediated superconductivity in orthorhombic XS(X=Nb,Ta or W)

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Chinese Physics B 2025年第2期34卷 419-423页

作者： Guo-Hua Liu Kai-Yue Jiang Yi Wan Shu-Xiang qiao jin-Han Tan Na Jiao Ping Zhang Hong-yan Lu School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China Institute of Applied Physics and Computational Mathematics Beijing 100088China

The unique three-dimensional orthorhombic NbS(o-NbS)compound synthesized in 1969 has recently been experimentally confirmed to be a superconductor[***.B 108174517(2023)].However,there is currently no theoretical research on its superconducting *** this work,we investigate the superconducting properties of o-Nb S from first-principles *** on the Eliashberg equation,it is found that the superconductivity mainly originates from the coupling between the electrons of Nb-4d orbitals and the vibrations of Nb atoms in the low-frequency region and those of S atoms in the high-frequency region.A superconducting transition temperature(T_c)of 10.7 K is obtained,which is close to the experimental value and higher than most transition metal chalcogenides(TMCs).The calculated thermodynamic properties in the superconducting state,such as specific heat,energy gap,isotope coefficient,etc.,also indicate that o-NbS is a conventional phonon-mediated *** results are consistent with recent experimental reports and provide a good understanding of the superconducting mechanism of o-Nb ***,the TMCs of o-TaS and o-WS are also investigated;these belong to the same and neighboring groups of Nb,and we find that o-TaS and o-WS are also phonon-mediated superconductors with T_c of 8.9 K and 7.2 K,respectively.

关键词： first-principles calculations phonon-mediated superconductivity orthorhombic transition metal chalcogenides

Oxygen deficiency mechanism of La3Ni2O7–δunder pressure

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Science China(Physics,Mechanics & Astronomy) 2025年第04期Mechanics & Astronomy) .卷 175-183页

作者： Yu Chen Ke Zhang Minghui Xu yan Zhao Haiyan Xiao Liang qiao School of Physics University of Electronic Science and Technology of China

The recent discovery of superconductivity in pressurized bilayer nickelate La3Ni2O7has triggered tremendous research ***,the experimentally observed oxygen deficiency implies that obtaining perfect stoichiometric single crystals is still *** influence of oxygen deficiency on physical properties remains ***,we construct a chemical potential phase diagram to characterize the stability of *** narrow stable region explains the difficulty of synthesizing pure ***,oxygen defect studies reveal that the interlayer apical oxygen vacancy has the highest defect concentrations and is responsible for oxygen ***,unfolding band structures show as the oxygen-deficient variant increases,Ni 3dz2 bands shift toward a lower energy position under the Fermi level atΓpoint,which is adverse to the metallization of Ni 3dz2 ***,high-pressure calculations indicate that oxygen vacancy would destroy the hybridization of interlayer Ni 3dz2 orbitals,and the larger the oxygen deficiency,the higher the pressure needed to metalize the Ni ***,the oxygen deficiency would suppress the emergence of superconductivity in La3Ni2O7–δ.Our results elucidate the mechanism of oxygen deficiency for superconductivity in La3Ni2O7–δand provide instructive guidance to the experimental research.

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The GECAM ground search system for gamma-ray transients

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Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 161-174页

作者： Ce Cai yan-Qiu Zhang Shao-Lin Xiong Ping Wang Jian-Hui Li Xiao-Bo Li Cheng-Kui Li Yue Huang Shi-Jie Zheng Li-Ming Song Shuo Xiao Qi-Bin Yi Yi Zhao Sheng-Lun Xie Rui qiao yan-Qi Du Zhi-Wei Guo Wang-Chen Xue Chao Zheng Jia-Cong Liu Chen-Wei Wang Wen-Jun Tan Yue Wang jin-Peng Zhang Chao-yang Li Guo-Ying Zhao Xiao-Yun Zhao Xiao-Lu Zhang Zhen Zhang Wen-Xi Peng Xiang Ma jing-yan Shi Dong-Ya Guo jin Wang Xin-qiao Li Xiang-yang Wen Zheng-Hua An Fan Zhang College of Physics and Hebei Key Laboratory of Photophysics Research and Application Hebei Normal UniversityShijiazhuang050024China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing100049China University of Chinese Academy of Sciences Beijing100049China School of Physics and Electronic Science Guizhou Normal UniversityGuiyang550001China Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing Guizhou Normal UniversityGuiyang550001China School of Physics and Optoelectronics Xiangtan UniversityXiangtan411105China School of Computer and Information Dezhou UniversityDezhou253023China Institute of Astrophysics Central China Normal UniversityWuhan430079China

In the era of time-domain,multi-messenger astronomy,the detection of transient events on the high-energy electromagnetic sky has become more important than *** gravitational wave high-energy electromagnetic counterpart all-sky monitor(GECAM)is a dedicated mission to monitor gamma-ray transients,launched in December,2020.A real-time on-board trigger and location software,using the traditional signal-to-noise ratio(SNR)method for blind search,is constrained to relatively bright signals due to the limitations in on-board computing resources and the need for real-time *** this work,we developed a ground-based pipeline for GECAM to search for various transients,especially for weak bursts missed by on-board *** pipeline includes both automatic and manual mode,offering options for blind search and targeted *** targeted search is specifically designed to search for interesting weak bursts,such as gravitational wave-associated gamma-ray bursts(GRBs).From the ground search of the data in the first year,GECAM has been triggered by 54 GRBs and other transients,including soft gamma-ray repeaters,X-ray binaries,solar flares,terrestrial gamma-ray *** report the properties of each type of triggers,such as trigger time and light *** this search pipeline and assuming a soft Band spectrum,the GRB detection sensitivity of GECAM is increased to about 1.1×10^(-8)erg cm^(-2)s^(-1)(10-1000 ke V,burst duration of 20 s).These results demonstrate that the GECAM ground search system(both blind search and targeted search)is a versatile pipeline to recover true astrophysical signals which were too weak to be found in the on-board search.

关键词： gamma-ray sources gravitational waves data analysis gamma-ray telescopes

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Functional abnormalities of the glymphatic system in cognitive disorders

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Neural Regeneration Research 2025年第12期20卷 3430-3447页

作者： Wuyue Shentu Qi Kong Yier Zhang Wenyao Li Qiulu Chen Sicheng yan Junjun Wang Qilun Lai Qi Xu Song qiao The Second Clinical Medical College Zhejiang Chinese Medical UniversityHangzhouZhejiang ProvinceChina Department of Neurology Zhejiang HospitalHangzhouZhejiang ProvinceChina Hangzhou TCM Hospital Affiliated to Zhejiang Chinese Medical University HangzhouZhejiang ProvinceChina Department of Neurology Zhejiang Medical&Health Group Hangzhou HospitalHangzhouZhejiang ProvinceChina Department of Neurology Liuzhou People’s HospitalLiuzhouGuangxi Zhuang Autonomous RegionChina Department of Radiology Zhejiang HospitalHangzhouZhejiang ProvinceChina

Various pathological mechanisms represent distinct therapeutic targets for cognitive disorders,but a balance between clearance and production is essential for maintaining the stability of the brain's internal ***,the glymphatic system may represent a common pathway by which to address cognitive *** the established model of the glymphatic system as our foundation,this review disentangles and analyzes the components of its clearance mechanism,including the initial inflow of cerebrospinal fluid,the mixing of cerebrospinal fluid with interstitial fluid,and the outflow of the mixed fluid and the *** section summarizes evidence from experimental animal models and human studies,highlighting the normal physiological properties of key structures alongside their pathological manifestations in cognitive *** same pathologic manifestations of different cognitive disorders appearing in the glymphatic system and the same upstream influences are main points of interest of this *** conclude this article by discussing new findings and outlining the limitations identified in current research progress.

关键词： aquaporin-4 astrocyte cerebrospinal fluid dynamics cognitive disorders glymphatic system

通络宝治疗仪在治疗慢性支气管炎阻塞性肺气肿中的应用

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中国医疗器械信息 2023年第16期29卷 151-153页

作者：陈昌华颜巧金连江县安凯乡卫生院福建福州350500

目的:针对慢性支气管炎阻塞性肺气肿患者采用通络宝治疗仪进行治疗,分析其应用效果。方法:随机选取本院2020年1月~2022年12月70例慢性支气管炎阻塞性肺气肿患者作为研究对象,随机分成观察组和对照组,各35例。对照组患者采用常规治疗方法... 详细信息

目的:针对慢性支气管炎阻塞性肺气肿患者采用通络宝治疗仪进行治疗,分析其应用效果。方法:随机选取本院2020年1月~2022年12月70例慢性支气管炎阻塞性肺气肿患者作为研究对象,随机分成观察组和对照组,各35例。对照组患者采用常规治疗方法,观察组患者采用通络宝治疗仪治疗,观察两组效果。结果:治疗后,从临床疗效上观察,观察组高于对照组,P<0.05;从肺功能改善上观察,观察组好于对照组,P<0.05;从临床症状恢复中观察,观察组各指标恢复好于对照组,P<0.05;从血常规以及血气分析指标上观察,观察组均好于对照组,P<0.05。结论:在常规治疗的基础上,采用通络宝治疗仪进行治疗,令患者咳嗽、咳痰等临床症状得到改善,临床效果显著,有利于改善患者肺功能指标,对促进患者恢复具有重要作用。

关键词：通络宝治疗仪慢性支气管炎阻塞性肺气肿

Electronic structure,elasticity,magnetism of Mn_(2)XIn(X=Fe,Co)full Heusler compounds under biaxial strain:First-principles calculations

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Chinese Physics B 2025年第1期34卷 438-449页

作者： Shiran Gao Chengyang Zhao Xinzhuo Zhang Wen qiao Shiming yan Ru Bai Tiejun Zhou School of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China

The electronic structure,elasticity,and magnetic properties of the Mn_(2)XIn(X=Fe,Co)full-Heusler compounds are comprehensively investigated via first-principles *** calculated elastic constants indicate that both Mn_(2)FeIn and Mn_(2)Co In possess *** the optimal lattice constants,the magnetic moments are found to be 1.40μB/*** Mn_(2)FeIn and 1.69μB/*** Mn_(2)*** the biaxial strain ranging from-2%to 5%,Mn_(2)FeIn demonstrates a remarkable variation in the spin polarization,spanning from-2%to 74%,positioning it as a promising candidate for applications in spintronic *** of the electronic structure reveals that the change in spin polarization under strain is due to the shift of the spin-down states at the Fermi ***,under biaxial strain,the magnetic anisotropy of Mn_(2)FeIn undergoes a transition of easy-axis *** second-order perturbation theory and electronic structure analysis,the variation in magnetic anisotropy with strain can be attributed to changes of d-orbital states near the Fermi surface.

关键词： magnetic anisotropy biaxial strain electronic band structure mechanical properties

Source localization based on symmetrical MUSIC and its statistical performance analysis

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Science China(Information Sciences) 2013年第6期56卷 74-86页

作者： yan FengGang jin Ming qiao XiaoLin School of Electronics and information Engineering Harbin Institute of Technology Laboratory of Information Engineering Harbin Institute of Technology(Weihai)

In this paper,a new method for fast direction-of-arrival(DOA) estimation with no dependance on array configurations is proposed,which is referred to as the symmetrical multiple signal classification(SMUSIC).Unlike the standard MUSIC,the S-MUSIC spatial spectrum is constructed by the intersection of the noise subspace and the conjugate noise subspace,and it hence generates spectral peaks at the true DOAs and the symmetrical virtual DOAs *** a characteristic allows fast DOA estimation by spectral search over only half of the total angular ***,the new approach has a much lower computational complexity than the standard *** statistical performance of S-MUSIC is studied and a close-form expression for the MSEs(mean square errors) of DOA estimation by the proposed estimator is *** simulations are conducted to demonstrate the effectiveness of the new algorithm and to verify the theoretical analysis,and it is indicated that S-MUSIC makes a trade-off between MSEs and lower computational complexity as well as an improved resolution for closely-spaced sources as compared to the standard MUSIC.

关键词： symmetrical multiple signal classification(S-MUSIC) direction-of-arrival(DOA) estimation alternative projection method(APM) singular value decomposition(SVD) statistical performance analysis