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Atomic-Scale Insights into Damage Mechanisms of GGr15 Bearing Steel Under Cyclic Shear Fatigue

Acta Metallurgica Sinica(English Letters) 2024年第7期37卷 1265-1278页

作者： Qiao-Sheng Xia Dong-Peng Hua qing Zhou ye-Ran Shi Xiang-Tao Deng Kai-Ju Lu Hai-Feng Wang Xiu-Bing Liang Zhao-Dong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang110819China Defense Innovation Institute Academy of Military ScienceBeijing100071China

Alternating shear stress is a critical factor in the accumulation of damage during rolling contact fatigue,severely limiting the service life of ***,the specific mechanisms responsible for the cyclic shear fatigue damage in bearing steel have not been fully *** the mechanical response and microstructural evolution of a model GGr15 bearing steel under cyclic shear loading are investigated through the implementation of molecular dynamics *** samples undergo 30 cycles under three different loading conditions with strains of 6.2%,9.2%,and 12.2%,*** findings indicate that severe cyclic shear deformation results in early cyclic softening and significant accumulation of plastic damage in the bearing ***,samples subjected to higher strain-controlled loading exhibit higher plastic strain energy and shorter fatigue ***,strain localization is identified as the predominant damage mechanism in cyclic shear fatigue of the bearing steel,which accumulates and ultimately results in fatigue ***,simulation results also revealed the microstructural reasons for the strain localization(e.g.,BCC phase transformation into FCC and HCP phase),which well explained the formation of white etching *** study provides fresh atomic-scale insights into the mechanisms of cyclic shear fatigue damage in bearing steels.

关键词： Cyclic shear fatigue Molecular dynamic simulation Bearing steels Plastic damage accumulation

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CNT array-induced nanobubble assembly,nanodisk fabrication and enhanced spectral detection of CNT bundle density

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Nano Research 2024年第8期17卷 7737-7745页

作者： Zhiyuan Xia Ziming ye Bo Zhao Tingsong Zhang Qi Wang Kun Chen Meng Li Xiaobing Kong Yu-qing Zheng Enzheng Shi Yuanyuan Shang Anyuan Cao School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Integrated Circuits Peking UniversityBeijing 100871China School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China School of Engineering Westlake UniversityHangzhou 310024China

Alignment,functionalization and detection of carbon nanotube(CNT)bundles are vital processes for utilizing this onedimensional nanomaterial in ***,we report a polymer-assisted wet shearing method to acquire super-aligned craterpatterned CNT arrays by nanobubble(NB)self-assembly with a"migrate and aggregation"mechanism and use craters to controllably mold even-sized nanodisks periodically along CNT bundles with tunable *** green,low-cost method can be extended to diverse substrates and fabricate different *** an example,the Ag-nanodisk-patterned CNT arrays are utilized as substrates of surface-enhanced Raman scattering(SERS)for rhodamine 6G(R6G)and methylene blue(MB)in which a linear correlation is found between the SERS intensity and the CNT bundle density due to the periodic distribution of hot spots,enabling a spectral detection of CNT bundles and their densities by conventional dye *** from routine morphological characterization,this spectral method possesses an enhanced accuracy and a detection range of 0.1–2μm^(–1),showing its uniqueness in the detection of CNT bundle density since the intensity of traditional spectral merely relates to the quantity of CNTs,exhibiting its potential in future CNT-bundle-based electronics.

关键词： CNT arrays nanobubbles self-assembly nanodisks surface-enhanced Raman scattering(SERS)

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COVID-19 pandemic amplified mortality rates among adolescents with bipolar disorder through family-related factors

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World Journal of Clinical Cases 2024年第11期12卷 1929-1935页

作者： Zhuo-Fan ye Yi-Han Hong Jian-Lin Yang Meng-qing Tan Ju-Min Xie Zu-Cai Xu Department of Neurology The Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Hubei Key Laboratory of Renal Disease Occurrence and Intervention Medical SchoolHubei Polytechnic UniversityHuangshi 435003Hubei ProvinceChina Psychological Children's Ward Mental Health Center of HuangshiHuangshi 435111Hubei ProvinceChina The Collaborative Innovation Center of Tissue Damage Repair and Regeneration Medicine Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina

BACKGROUND Recently,a growing number of adolescents have been afflicted with mental disorders,with annual morbidity rates on the *** trend has been exacerbated by the global coronavirus disease 2019(COVID-19)pandemic,leading to a surge in suicide and self-harm rates among this *** To investigate the impact of the COVID-19 pandemic on adolescent bipolar disorder(BD),along with the underlying factors contributing to heightened rates of suicide and self-harm among *** A comprehensive statistical analysis was conducted utilizing clinical interviews and self-reports obtained from patients or their *** criteria for BDs were based on the Diagnostic and statistical manual of mental disorders,international classification of diseases-11,and the National institute of mental health research domain *** analyses were performed using SPSS 26.0 software,with significance set at Pyears *** factors contributing to adolescent BDs included familial influences,academic stress,genetic predisposition and exposure to school-related ***,a significant increase in suicide attempts and self-harm incidents was observed among adolescents with BD during the COVID-19 *** analysis indicated that the pandemic exacerbated familial discord and heightened academic stress,thereby amplifying the prevalence of suicidal behavior and self-harm among *** The COVID-19 pandemic has exacerbated familial tensions and intensified the incidence of suicide and self-harm among adolescents diagnosed with *** study underscores the urgent need for societal,familial and educational support systems to prioritize the well-being of adolescents and offers valuable insights and guidelines

关键词： Adolescents Bipolar disorder COVID-19 Suicide Self-harm

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Drosophila adhesion GPCR Remoulade regulates axon growth, branching, and guidance by modulating Rac1 GTPase

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Journal of Genetics and Genomics 2024年第4期51卷 458-461页

作者： Xi Yang Changkun Pan Meitong ye Jinshuo Liang Haoyang Cheng qing Liang Shu Huang Jianshu Wang Hoi yee Chow Haihuai He Cancer Center and State Key Laboratory of Biotherapy West China HospitalSichuan UniversityChengduSichuan 610041China National Clinical Research Center for Geriatrics and State Key Laboratory of Biotherapy West China HospitalSichuan UniversityChengduSichuan 610041China Department of Neurosurgery Cancer Center and State Key Laboratory of BiotherapyWest China HospitalSichuan UniversityChengduSichuan 610041China

The assembly of neurons into complex circuits relies upon appropriate axonal navigation to distant *** considerable progress has been made toward understanding the regulation of the guidance and branching of axon extension,the molecular and cellular mechanisms underlying the coordination of the motility of the axon tip,axon growth,and branching remain largely unknown(Sudhof,2017).The Drosophila mushroom body(MB),the major site for associative learning and memory,is a powerful model system to investigate complex axon *** MB is a bilaterally symmetric central brain structure,mainly composed of Kenyon cells,MB output neurons,and dopaminergic neurons(Li et al.,2020).Among the seven neuronal subtypes of~2000 Kenyon cells,Y,a/β,and a/β'subtypes extend axons in a fascicle and bifurcate to produce two sister branches,one projecting into the dorsal lobe and the other into the medial lobe.

关键词： branching medial axon

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Cosmological constraints on neutrino mass within consistent cosmological models

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Chinese Physics C 2024年第6期48卷 191-197页

作者：庞业煌张雪黄庆国 School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Center for Gravitation and Cosmology College of Physical Science and TechnologyYangzhou UniversityYangzhou 225009China

Recently,the emergence of cosmological tension has raised doubts about the consistency of the ACDM *** constrain the neutrino mass within a consistent cosmological framework,we investigate three massive neutrinos with normal hierarchy(NH)and inverted hierarchy(IH)in both the axion-like early dark energy(AxiEDE)and AdS-EDE *** use joint datasets including the cosmic microwave background power spectrum from Plaanck 2018,Pantheon of type la supernova,baryon acoustic oscillation,and H0data from *** the vAxi-EDE model,we obtain∑m_(v),NH<0.152 eV and∑m_(v),IH<0.178 eV,whereas for the vAdS-EDE model,we find∑m_(v),NH<0.135 eV and∑m_(v),IH<0.167 *** results exhibit a preference for NH in both the vAxi-EDE and vAdS-EDE models.

关键词： neutrino mass cosmological tension early dark energy

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Molecular Conformational Isomerization:An Efficient Way to Design Novel Emitters with Dual-Thermally Activated Delayed Fluorescence Characteristics and Their Optoelectronic and Bioimaging Applications

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CCS Chemistry 2024年第4期6卷 912-922页

作者： Yi-Zhong Shi Ya-Fang Xiao Hao Wu Shao-Li Zhang Xiao-Chun Fan ye Tian Chang-qing ye Kai Wang Jia Yu Chun-Sing Lee Xiao-Hong Zhang School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009 Institute of Functional Nano and Soft Materials(FUNSOM) Joint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123Jiangsu Center of Super-Diamond and Advanced Films(COSDAF) Department of ChemistryCity University of Hong KongHong Kong SAR School of Biomedical Engineering The Second Affiliated HospitalGuangzhou Medical UniversityGuangzhou 510260 Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices Soochow UniversitySuzhou 215123Jiangsu Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215123Jiangsu

Single-molecule luminophores with dual-thermally activated delayed fluorescence(TADF)properties are receiving increasing ***,how to achieve these goals requires more in-depth ***,we demonstrate a novel example emitter,10-(5-(2-(pyridin-3-yl)-[4,5′-bipyrimidin]-6-yl)pyridin-2-yl)-10Hphenoxazine(PmPy-PXZ),enabling dual-TADF properties due to its key feature of conformational *** a pyridine bridge can greatly reduce the steric hindrance and facilitate dual-stable conformations in the ground state,where the quasi-axial(QA)forms ***,unlike previously reported TADF molecules with dual confirmations,both theoretical and experimental measurements show that not only the quasi-equatorial(QE)forms but also the QA forms exhibit distinct TADF characteristics,which can be attributed to an additional higher reverse intersystem crossing *** is the first time that dual-TADF properties of single molecules have been achieved based on conformational *** applications in“self-doping”organic light-emitting diode and biomedical imaging have further been *** these results show the good potential of such dual-band TADF emitters based on molecular conformational isomerization.

关键词： dual-thermally activated delayed fluorescence conformational isomerization organic light-emitting diode biomedical imaging self-doping

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Iron oxide/CNT-based artificial nacre for electromagnetic interference shielding

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Nano Research 2024年第7期17卷 6560-6566页

作者： Cheng-Xin Yu Yu-Feng Meng Bo Yang Jun Pang Xiang-Sen Meng Zi-ye Zhao qing-Yue Wang Li-Bo Mao Zhi-Kun Wu Shu-Hong Yu Institute of Physical Science and Information Technology Anhui UniversityHefei 230601China Key Laboratory of Materials Physics Anhui Key Laboratory of Nanomaterials and NanotechnologyCAS Center for Excellence in NanoscienceInstitute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China Department of Chemistry New Cornerstone Science LaboratoryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China

Biological structural materials,despite consisting of limited kinds of compounds,display multifunctionalities due to their complex hierarchical *** some biomimetic strategies have been applied in artificial materials to enhance their mechanical stability,the simultaneous optimization of other functions along with the mechanical properties via biomimetic designs has not been thoroughly ***,iron oxide/carbon nanotube(CNT)-based artificial nacre with both improved mechanical and electromagnetic interference(EMI)shielding performance is fabricated via the mineralization of Fe_(3)O_(4)onto a CNTincorporated *** micro-and nano-structures of the artificial nacre are similar to those of natural nacre,which in turn improves its mechanical *** alternating electromagnetic wave-reflective CNT layers and the wave-absorptive iron oxide layers can improve the multiple reflections of the waves on the surfaces of the reflection layers,which then allows sufficient interactions between the waves and the absorption ***,compared with the reflection-dependent EMI-shielding of the non-structured material,the artificial nacre exhibits strong absorption-dependent shielding behavior even with a very low content of wave-absorptive *** to the high mechanical stability,the shielding effectiveness of the artificial nacre that deeply cut by a blade is still maintained at approximately 70%−96%depending on the incident wave *** present work provides a new way for designing structural materials with concurrently enhanced mechanical and functional properties,and a path to combine structural design and intrinsic properties of specific materials via a biomimetic strategy.

关键词： artificial nacre electromagnetic interference shielding biomineralization biomimetic material hierarchical structure

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文化装置的建造与更新:党领导文艺的“经”与“权”

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文艺理论与批评 2024年第5期 21-31页

作者：叶青中央戏剧学院导演系

中国共产党领导文艺走过了百年历程,在新时代的历史节点重新理解党领导文艺的原则与其不同历史时期因地制宜的方针政策之间的辩证关系,十分必要。通过重新阐释列宁关于“巨大的社会民主主义机器的‘齿轮和螺丝钉’”的论述,以及马克思... 详细信息

中国共产党领导文艺走过了百年历程,在新时代的历史节点重新理解党领导文艺的原则与其不同历史时期因地制宜的方针政策之间的辩证关系,十分必要。通过重新阐释列宁关于“巨大的社会民主主义机器的‘齿轮和螺丝钉’”的论述,以及马克思列宁主义的中国化,可以看到文艺的“党性原则”,意指把关乎社会总体的新文化与社会主体的生成过程、社会主义国家建构过程绑定在一起,而其内含的“经”与“权”的辩证运动的结构,指向了国家机器及其新的文化装置的自我更新的问题。“中国式现代化”的概念则从总体性维度,为综合党领导文艺的百年经验提供了理论视野。

关键词： “齿轮和螺丝钉” 文化装置 “经”与“权” 中国式现代化

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违法立案的检察监督机制研究

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国家检察官学院学报 2024年第1期32卷 53-68页

作者：叶青华东政法大学刑事法学院

立案作为刑事诉讼的启动程序,决定着案件是否被纳入刑事追诉的范围。加强和完善刑事立案监督工作,对于及时发现和纠正违法立案现象,促进严格公正执法,维护司法公正,确保国家法律的统一正确实施,具有重要价值。司法实践中,因立法缺失、... 详细信息

立案作为刑事诉讼的启动程序,决定着案件是否被纳入刑事追诉的范围。加强和完善刑事立案监督工作,对于及时发现和纠正违法立案现象,促进严格公正执法,维护司法公正,确保国家法律的统一正确实施,具有重要价值。司法实践中,因立法缺失、程序不畅、组织保障不足,导致监督机制失衡,对违法立案的监督具有明显滞后性。研究如何修订相关规范、拓宽案件线索的来源渠道、规范化运行监督撤案程序及提供科学有效的组织保障,对建立健全违法立案的检察监督机制大有裨益。

关键词：违法立案检察监督监督机制

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Effects and mechanisms of Helicobacter pylori infection on the occurrence of extra-gastric tumors

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World Journal of Gastroenterology 2024年第37期30卷 4090-4103页

作者： Shi-qing Zhao Hui-Ling Zheng Xiao-Tian Zhong Zi-ye Wang Yi Su Yan-Yan Shi Research Center of Clinical Epidemiology Peking University Third HospitalBeijing 100191China Health Science Center Peking UniversityBeijing 100191China Department of Gastroenterology Peking University Third HospitalBeijing 100191China

Helicobacter pylori(***)colonizes the human stomach and many studies have discussed the mechanisms of *** infection leading to gastric diseases,including gastric ***,increasing data have shown that the infection of *** may contribute to the development of extra-gastric diseases and ***,systemic immune responses,microbiome disorders,and hypergastrinemia caused by *** infection are associated with many extra-gastric *** review highlights recent discoveries;discusses the relationship between *** and various extra-gastric tumors,such as colorectal cancer,lung cancer,cholangiocarcinoma,and gallbladder carcinoma;and explores the mechanisms of extra-gastric carcinogenesis by ***,these findings refine our understanding of the pathogenic processes of ***,provide guidance for the clinical treatment and management of ***-related extra-gastric tumors,and help improve prognosis.

关键词： Helicobacter pylori Extra-gastric tumors Immune system response Mucosal barrier Gut microbiome

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