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Elastic three-dimensional phononic topological insulators with Dirac hierarchy

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 54-62页

作者： Shao-Yong Huo Qiu-Shuang Yang Jiu-Jiu Chen Hong-Kang Li Long-Chao Yao fu-chun He chun-Ming fu College of Mechanical Engineering University of South ChinaHengyang 421001China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle EngineeringHunan UniversityChangsha 410082China

Three-dimensional(3D)phononic topological insulators(TIs)featuring two-dimensional(2D)surface states and one-dimensional(1D)hinge states have opened up a new route for multi-dimensional robust wave transport,providing unprecedented methods for integrated acoustic sensors and energy harvesting ***,aiming at the elastic 3D phononic TI with gapless surface states and hinge states,the realization of elastic 3D phononic TIs with gapless surface states and hinge states is a significant challenge due to the complicated multi-mode polarization of elastic waves in 3D *** this study,we demonstrate an elastic 3D phononic TI with a Dirac hierarchy by elaborately operating the corresponding spatial symmetries of the chiral honeycomb ***,a 3D double Dirac cone of elastic wave can be achieved by doubling the lattice along the outof-plane direction to fold two iso-frequency Weyl *** topological phase transitions and 2D gapless two-fold Dirac surface states of elastic wave are realized by breaking the half-lattice spatial translation ***,based on the Brillouin zone folding along the in-plane direction,the 2D gapless two-fold surface Dirac cones are folded into four-fold surface Dirac ***,by inducing the relative radius of adjacent holes to break the in-plane spatial inversion symmetry,the fourfold surface Dirac cones are gapped and associated with a surface state inversion,in which the gapless 1D hinge Dirac dispersion is *** research offers a route for engineering the hierarchies of TIs in 3D elastic wave systems and provides new possibilities for designing 3D ultrasonic devices with unconventional functions.

关键词： Dirac topological hierarchy

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The preface: Interplay of topological and magnetic orders in the Mn-Bi-Te family

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National Science Review 2024年第2期11卷 6-7页

作者： fu-chun Zhang Hai-Zhou Lu X.C.Xie Kavli Institute for Theoretical Sciences University of Chinese Academy of Sciences Department of Physics Southern University of Science and Technology (SUSTech) International Center for Quantum Materials School of Physics Peking University

The discovery and synthesis of MnBi2Te4in 2013 initially garnered little attention [1]. Yet, the revelation of its topological properties in 2019 [2–6] sparked a surge of research into the MnBiTe family. These extensive studies are primarily driven by two objectives:the realization of a high-temperature quantum anomalous Hall effect （QAHE） and the exploration of exotic phases born from the interplay of topological and magnetic orders,

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Surgical treatment of an old avulsion fracture of the ischial tuberosity and ischial ramus: A case report

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World Journal of Orthopedics 2024年第1期15卷 94-100页

作者： Zi-Ru Chen Shi-Jie Liao fu-chun Yang Department of Orthopedic Trauma and Hand Surgery The First Affiliated Hospital of Guangxi Medical UniversityNanning 530021Guangxi Zhuang Autonomous RegionChina

BACKGROUND Avulsion fracture of the ischial tuberosity is a relatively clinically rare type of trauma that is mainly incurred by adolescents during competitive sports *** to previous literature,the most commonly involved sports are soccer,sprinting,and gymnastics,in descending ***-induced avulsion fracture of the ischial tuberosity and ischial ramus is extremely clinically *** SUMMARY A case of a neglected avulsion fracture of the ischial tuberosity and ischial ramus was diagnosed in a young female dancer who complained of pain and restricted movement of her right *** stated that she had suffered the injury while performing a split leap during a dance performance 9 mo ***,she underwent surgery and obtained satisfactory treatment *** Early diagnosis of these fractures is important to ensuring early proper treatment towards a quicker *** old fractures with nonunion and chronic buttock pain,surgery is a preferred therapeutic choice with good treatment outcomes.

关键词： Ischial tuberosity Ischial ramus Avulsion fracture Delayed diagnosis Splitleap injury Case report

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High-Temperature Superconductivity in La_(3)Ni_(2)O_(7)

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Chinese Physics Letters 2024年第1期41卷 85-91页

作者：蒋坤汪自强张富春 Beijing National Laboratory for Condensed Matter Physics and Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Department of Physics Boston CollegeChestnut HillMA 02467USA Kavli Institute of Theoretical Sciences University of Chinese Academy of SciencesBeijing 100190China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China

Motivated by the recent discovery of high-temperature superconductivity in bilayer La_(3)Ni_(2)O_(7) under pressure,we study its electronic properties and superconductivity due to strong electron *** the inversion symmetry,we decouple the low-energy electronic structure into block-diagonal symmetric and antisymmetric *** is found that the antisymmetric sector can be reduced to a one-band system near half filling,while the symmetric bands occupied by about two electrons are heavily overdoped *** the strong coupling mean field theory,we obtain strong superconducting pairing with B_(1g)symmetry in the antisymmetric *** propose that due to the spin-orbital exchange coupling between the two sectors,B_(1g)pairing is induced in the symmetric bands,which in turn boosts the pairing gap in the antisymmetric band and enhances the high-temperature superconductivity with a congruent d-wave symmetry in pressurized La_(3)Ni_(2)O_(7).

关键词： symmetry superconductivity symmetric

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Understanding the Global Identification with China’s Stories: A Cross-Cultural Perspective

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Contemporary Social Sciences 2024年第1期9卷 46-57页

作者： fu chun Deng Da Sichuan Academy of Social Sciences The University of Newcastle Chengdu Polytechnic

Cross-cultural storytelling is a primary way for humankind to seek mutual recognition of value orientations between cultures,which facilitates the ability to jointly address the problems of human existence in the context of *** this study,we conducted an interview survey of 6,130 respondents who were college students or graduates from 107 *** results show that there were a number of cross-cultural values embodied in China’s stories seen by the respondents as part of a common vision for the future of humankind and widely identified guidance on collaborative responses to global *** cross-cultural values are common prosperity,ecological harmony,individual-collective integration,the urgency of global peace,as well as respect for multicultural and indigenous development paths.

关键词： China’s stories global identification cross-cultural communication

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Effect of Platelet-rich Plasma in Stimulating Macrophage Transformation into M2 Type under AMPK Signaling Pathway

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Chinese Journal of Biomedical Engineering 2024年第2期 85-92页

作者： ZHONG Chang-rui fu chun-hua Longyan First Affiliated Hospital of fujian Medical University The Second Hospital of Longyan

Objective: To explore the effect of platelet-rich plasma(RPR) in stimulating the transformation of pro-inflammatory(M1) macrophages into antiinflammatory(M2) under the adenosine-monophosphate-dependent protein kinase(AMPK) signaling pathway. Methods: Rat peritoneal macrophages(RAW264.7) were cultured and randomly divided into 8 groups: blank control group, LPS group, RPR group A, RPR group B, LPS+RPR(12 h) group, LPS+RPR(24 h) group A, LPS+RPR(24 h)group B, LPS+RPR(24 h) group C. RPR was prepared based on blood donors. The expressions of AMPK signaling pathway-related proteins(AMPK, ULK1, m TOR) and macrophage markers(i NOS, Arg-1) in the blank control group, LPS group, LPS+RPR(12 h)group and LPS+RPR(24 h) group were observed and compared. The expressions of macrophage markers in LPS+RPR(24 h) B and C groups were compared, and the expressions of AMPK and TGF-β in RPR A and B groups were compared. Results: The gray values of AMPK and ULK1 in LPS cells decreased significantly, while those in LPS+RPR(12 h) and LPS+RPR(24 h) A cells increased significantly. The gray values of AMPK and ULK1 in LPS+RPR(24 h) A cells were higher than those in LPS+RPR(12 h)cells(P<0.05). The m TOR gray value of LPS cells was significantly higher than that of LPS+RPR(24 h) A cells, and the m TOR gray value of LPS+RPR(24 h) A cells was significantly lower than that of LPS+RPR(12 h) cells(P<0.05). The expression of i NOS in LPS cells was significantly decreased, the expression of i NOS in LPS+RPR(12 h) and LPS+RPR(24 h) cells was significantly increased, and the expression of i NOS in LPS+RPR(24 h) cells was higher than that in LPS+RPR(12 h) cells(P<0.05). The expression of Arg-1 in LPS cells was significantly decreased, the expression of Arg-1 in LPS+RPR(12 h) and LPS+RPR(24 h) A cells was significantly increased, and the expression of Arg-1 in LPS+RPR(24 h) A cells was higher than that in LPS+RPR(12 h)cells(P<0.05). The i NOS expression level of LPS+PRP(24 h) C cells was significantly higher

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Interaction between catechol-O-methyltransferase Val/Met polymorphism and cognitive reserve for negative symptoms in schizophrenia

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World Journal of Psychiatry 2024年第5期14卷 695-703页

作者： Wen-Peng Hou Xiang-Qin Qin Wei-Wei Hou Yun-Yi Han Qi-Jing Bo Fang Dong fu-chun Zhou Xian-Bin Li Chuan-Yue Wang Beijing Key Laboratory of Mental Disorders National Clinical Research Center for Mental Disorders&National Center for Mental DisordersBeijing Anding HospitalCapital Medical UniversityBeijing 100088China Advanced Innovation Center for Human Brain Protection Capital Medical UniversityBeijing 100069China

BACKGROUND Cognitive reserve(CR)and the catechol-O-methyltransferase(COMT)Val/Met polymorphism are reportedly linked to negative symptoms in ***,the regulatory effect of the COMT genotype on the relationship between CR and negative symptoms is still *** To investigate whether the relationship between CR and negative symptoms could be regulated by the COMT Val/Met *** In a cross-sectional study,54 clinically stable patients with schizophrenia underwent assessments for the COMT genotype,CR,and negative *** was estimated using scores in the information and similarities subtests of a short form of the Chinese version of the Wechsler Adult Intelligence *** COMT Met-carriers exhibited fewer negative symptoms than Val *** the total sample,significant negative correlations were found between negative symptoms and information,*** between information,similarities and negative symptoms were observed in Val homozygotes only,with information and similarities showing interaction effects with the COMT genotype in relation to negative symptoms(information,β=-0.282,95%CI:-0.552 to-0.011,P=0.042;similarities,β=-0.250,95%CI:-0.495 to-0.004,P=0.046).CONCLUSION This study provides initial evidence that the association between negative symptoms and CR is under the regulation of the COMT genotype in schizophrenia.

关键词： Catechol-O-methyltransferase Val/Met polymorphism Cognitive reserve Crystallized intelligence Negative symptoms Schizophrenia

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城市轨道交通突发事件风险等级判别方法

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吉林大学学报（工学版） 2024年第2期54卷 427-435页

作者：范博松邵春福中国人民公安大学交通管理学院北京100038 北京交通大学综合交通运输大数据应用技术交通运输行业重点实验室北京100044 新疆大学交通运输工程学院乌鲁木齐830046

为提升风险等级判别的准确性,破解城市轨道交通系统风险实时管控和事件应急处理的关键问题,构建了改进的特征选择算法(Im-F-score+XGB)对突发事件风险因素的特征进行筛选,通过分析城市轨道交通突发事件的基础数据,计算各风险特征的重要... 详细信息

为提升风险等级判别的准确性,破解城市轨道交通系统风险实时管控和事件应急处理的关键问题,构建了改进的特征选择算法(Im-F-score+XGB)对突发事件风险因素的特征进行筛选,通过分析城市轨道交通突发事件的基础数据,计算各风险特征的重要度,挖掘不同特征对突发事件风险等级的影响程度,得到突发事件风险等级判定的重要特征;同时,采用多时间窗循环扫描方法和加权级联残差森林模型相融合的思路,获得突发事件风险等级与风险特征的映射关系,建立了改进的突发事件风险等级判别模型(Im-F-GCF)。通过与RF、HGBDT、GCF、LightGBM 4个代表模型对比分析,显示出本文提出的Im-F-GCF模型的有效性。

关键词：交通运输规划与管理城市轨道交通突发事件风险等级特征选择加权级联残差森林

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阴道内加德纳菌和乳杆菌生物膜的相互影响与意义

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中国微生态学杂志 2024年第4期36卷 473-477页

作者：唐艺嘉符淳中南大学湘雅医学院湖南长沙410013 中南大学湘雅二医院妇产科

乳杆菌通常是健康女性阴道内的优势菌,在阴道内形成生物膜,通过代谢和炎症等机制来维持阴道内的平衡,保持阴道内的酸性环境,抵抗病原体的入侵和定植。当阴道内微生物群平衡被常见病原体如加德纳菌破坏时,将引发细菌性阴道病。加德纳菌... 详细信息

乳杆菌通常是健康女性阴道内的优势菌,在阴道内形成生物膜,通过代谢和炎症等机制来维持阴道内的平衡,保持阴道内的酸性环境,抵抗病原体的入侵和定植。当阴道内微生物群平衡被常见病原体如加德纳菌破坏时,将引发细菌性阴道病。加德纳菌在阴道内形成生物膜后,会增加其耐药性和复发概率,形成难治性细菌性阴道病。本文综述了乳杆菌和加德纳菌生物膜的形成对阴道微环境的影响,探讨两者生物膜的相互作用机制,进一步揭示病原体生物膜对HPV感染的影响,为临床治疗病原体生物膜引起的感染提供新的策略。

关键词：生物膜细菌性阴道病加德纳菌乳杆菌

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学校制度目标的价值取向与体系构建

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教学与管理 2024年第22期 11-15页

作者：王慧妹傅淳华北京科技大学马克思主义学院北京100083 中央民族大学教育学院北京100083

就学校制度目标的本意而言,无疑应在社会性取向和个体性取向之间保持张力,但在很长一段时间内,中国教育界并不能很好地认识与把握这一立场。正是在此意义上,必须积极挖掘教育学术史上的相关思想资源,以此作为教育理论与实践发展的基础... 详细信息

就学校制度目标的本意而言,无疑应在社会性取向和个体性取向之间保持张力,但在很长一段时间内,中国教育界并不能很好地认识与把握这一立场。正是在此意义上,必须积极挖掘教育学术史上的相关思想资源,以此作为教育理论与实践发展的基础。当然,即便是夸美纽斯等先哲的认识,其实在某种程度上也不够全面,如仅仅侧重行为。因此,须从反思前人的相关思想成果出发,进而立足于学生个体发展的立场,整体构建学校制度的目标体系,从而在根本上保证学校制度乃至学校教育的合理发展。

关键词：学校制度学校教育目标体系

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