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Evaluation of Tensile and Fatigue Properties of Metals Using Small Specimens

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 147-157页

作者： wen‑ke Yang Zhu‑Man Song Xue‑Mei Luo Guang‑Ping zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

Small specimens are increasingly being used in getting mechanical properties directly when there are limited materials to facilitate standard specimens,which play a great role in the rapid measurement of mechanical properties and residual life assessment of in-service reactor *** tensile and fatigue properties of the small specimens are investigated extensively,theoretical models for describing the mechanical properties of small specimens need to be ***,we conduct a systematic investigation of tensile and fatigue properties of pure Cu specimens with thicknesses ranging from 3 to 0.2 *** results show that the decrease in uniform elongation of the 0.2 mm-thick specimens is mainly due to the efects of grain boundary and free surface on the strain hardening rate.A modifed theoretical model correlated with the ratio of the surface grain layer thickness to the grain size is proposed to predict variation in yield strength of the small specimens more ***,the mechanism for the diference in fatigue life between the 0.2 mm-thick specimen and other thicker specimens is *** Basquin equation-based model is presented as a potential way to evaluate the fatigue life of metals using small specimens.

关键词： Size efect Small specimen Tensile property Fatigue life

Is it possible to foot reflexology for infants with sensorineural hearing loss?

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World Journal of Clinical Cases 2025年第2期13卷 1-4页

作者： Min Ai Hang-Hang zhang Jun-Bang Feng Chuan-Ming Li wen-Jing Wang Meng-Die Hu Department of Anesthesiology Nanan District People's Hospital of ChongqingChongqing 400060China Department of Breast and Thyroid Surgery Chongqing Bishan District Maternal and Child Health Care HospitalChongqing 402760China Department of Medical Imaging Chongqing University Central HospitalChongqing 400014China

Foot reflexology is a non-invasive and safe complementary therapy that works by massaging the reflex zones of the feet and exerts systemic or whole-body regulation through meridian nerve *** therapy is commonly used in the treatment of various conditions such as autism and Parkinson's ***,there is limited reporting on the use of foot reflexology therapy for infants with sensorineural hearing loss(SNHL).Currently,there is no definitive conclusion on how foot reflexology therapy can influence *** editorial holds some guiding significance regarding this clinical *** aim is to present physiological evidence of how foot reflexology therapy can impact infants with SNHL,thereby enhancing clinician’s awareness of foot reflexology in treating infants with SNHL.

关键词： Foot reflexology Sensorineural Hearing Loss Future perspectives Limitations Neural conduction

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缺陷对单层硅烯纳米梁振动频率的影响

原子与分子物理学报 2025年第6期42卷 76-82页

作者：张文博王静新疆大学物理科学与技术学院乌鲁木齐830017

由于硅纳米谐振器在量子计算、传感器、医学等方面存在广泛的应用,使其物理性质的研究具有重要意义.本文通过分子动力学模拟方法研究了掺杂元素、空位缺陷、掺杂浓度对单层硅烯纳米梁振动特性的影响.研究结果表明,单层硅烯纳米梁的振动... 详细信息

由于硅纳米谐振器在量子计算、传感器、医学等方面存在广泛的应用,使其物理性质的研究具有重要意义.本文通过分子动力学模拟方法研究了掺杂元素、空位缺陷、掺杂浓度对单层硅烯纳米梁振动特性的影响.研究结果表明,单层硅烯纳米梁的振动频率随着纳米梁长度的增加而减小.单元素、双元素掺杂均会导致单层硅烯纳米梁的振动频率的增加,且随着掺杂浓度的增加纳米梁的振动频率整体呈现增大的趋势.此外,单空位缺陷会导致单层硅烯纳米梁的振动频率随着缺陷浓度的增加而减小.掺杂-单空位缺陷的单层硅烯纳米梁的振动频率则呈现了随着掺杂浓度的增加先减小后增加的变化趋势.这些变化规律均是由掺杂元素、空位缺陷以及它们共同作用的结果.此研究结果对硅烯纳米谐振器,振荡器等纳米器件的设计具有一定的理论指导意义.

关键词：硅烯掺杂振动频率分子动力学

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福建特色农业产业技术创新联盟的构建与发展

台湾农业探索 2017年第2期 69-72页

作者：黄爱萍林海清柯文辉张梅福建省农业科学院农业经济与科技信息研究所福建福州350003

产业技术联盟作为一种新型的产学研合作创新组织,在推动产业持续创新发展中发挥了越来越重要的作用。该文概述了福建省农业产业技术创新联盟的开展情况,探讨了构建农业产业技术创新联盟的必要性,并提出立足福建区域特色农业,构建"福建... 详细信息

产业技术联盟作为一种新型的产学研合作创新组织,在推动产业持续创新发展中发挥了越来越重要的作用。该文概述了福建省农业产业技术创新联盟的开展情况,探讨了构建农业产业技术创新联盟的必要性,并提出立足福建区域特色农业,构建"福建现代种业型"、"福建特色农产品型"、"福建生态型"、"福建现代设施农业型"、"福建农业文化型"、"闽台农业合作型"等6个类型的产业创新联盟。

关键词：福建特色农业产业技术创新联盟构建

Activation Energy for Superplastic Flow Above Critical Temperature of Die Steels

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Journal of Iron and Steel Research International 2006年第5期13卷 4-6页

作者： wen Jiu-ba zhang ke-ke CHEN Fu-xiao YANG Yong-shun School of Materials Science and Engineering Henan University of Science and Technology Luoyang 471003 Henan China

Some commercial cold working die steels C.,Cr15 and CrWMn with ultra fine grain size were chosen as tested materials to research the activation energy for superplastic flow at different temperatures and strain rates above critical temperature. Based on the Arrhenius equation, the activation energy for superplastic flow is evaluated. The activation energy at constant strain rate is estimated by the logσ, vs 1/T relationship. The results show that the ac tivation energy is usually small under the conditions of optimal flow. The characteristics of superplastic deformation of steels above the critical temperature were also analyzed.

关键词： superplasticity superplastic working activation energy

Satellite remote sensing reveals overwhelming recovery of forest from disturbances in Asia

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 46-51页

作者： Yiying Zhu Hesong Wang Anzhi zhang School of Ecology and Nature Conservation Beijing Forestry UniversityBeijingChina key Laboratory of Regional Climate and Environment for Temperate East Asia Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Forestry and Landscape Architecture Xinjiang Agricultural UniversityUrumqiChina

Forest ecosystems play key roles in mitigating human-induced climate change through enhanced carbon uptake;however,frequently occurring climate extremes and human activities have considerably threatened the stability of *** the same time,detailed accounts of disturbances and forest responses are not yet well quantified in *** study employed the Breaks For Additive Seasonal and Trend method-an abrupt-change detection method-to analyze the Enhanced Vegetation Index time series in East Asia,South Asia,and Southeast *** approach allowed us to detect forest disturbance and quantify the resilience after *** showed that 20%of forests experienced disturbance with an increasing trend from 2000 to 2022,and Southeast Asian countries were more severely affected by ***,95%of forests had robust resilience and could recover from disturbance within a few *** resilience of forests suffering from greater magnitude of disturbance tended to be stronger than forests with lower disturbance *** summary,this study investigated the resilience of forests across the low and middle latitudes of Asia over the past two *** authors found that most forests exhibited good resilience after disturbance and about two-thirds had recovered to a better state in *** findings of this study underscore the complex relationship between disturbance and resilience,contributing to comprehension of forest resilience through satellite remote sensing.

关键词： Forest ecosystem Enhanced vegetation index Breaks for additive seasonal and trend method Disturbance Resilience

Synthesis of micron-sized hollow silica spheres with a novel mesoporous shell of MCF

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Chinese Chemical Letters 2009年第7期20卷 852-856页

作者： An Feng zhang Yong Chun zhang Na Xing ke ke Hou Jing Wang Xin wen Guo State key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology Dalian 116012 China

Micron-sized hollow silica spheres whose shells are made up of mesocellular silica foams （MCFs） have been synthesized by one-pot sol-gel method in benzene/water/P123 emulsion. The material is characterized with SEM, TEM, BET and ^29Si MAS NMR. The results show that the MCFs of the unique shell of hollow silica spheres were connected by large windows with a narrow distribution of - 10 nm in diameter, the inner space of the hollow sphere is accessible. And the formation mechanism of the hollow silica spheres is proposed. C 2009 Xin wen Guo. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Hollow spheres MCF Mesoporous material

第一性原理对M@B_(12)N_(12)(M=Sc-Zn)团簇结构和性质的研究

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原子与分子物理学报 2025年第4期42卷 93-99页

作者：张颂程露吴学科凯里学院理学院凯里556011

利用基于密度泛函理论的第一性原理对M@B_(12)N_(12)(M=Sc-Zn)团簇的几何、电子结构,电偶极性和红外吸收光谱进行详细的研究.结果显示:当B_(12)N_(12)团簇内嵌过渡金属原子后,虽然结构稳定性稍稍降低,但其化学活性得到提高,摩尔体积明... 详细信息

利用基于密度泛函理论的第一性原理对M@B_(12)N_(12)(M=Sc-Zn)团簇的几何、电子结构,电偶极性和红外吸收光谱进行详细的研究.结果显示:当B_(12)N_(12)团簇内嵌过渡金属原子后,虽然结构稳定性稍稍降低,但其化学活性得到提高,摩尔体积明显增大.过渡金属原子与B_(12)N_(12)结合的过程中,除Cu和B原子外,剩余金属与N原子的Mulliken电荷出现负值.另外,金属原子的加入,不仅增加电偶极矩和极化率的值,还促使其红外吸收光谱发生红移.

关键词：团簇结构性质第一性原理

Further Results on Mutually Nearly Orthogonal Latin Squares

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 209-220页

作者： ke-jun CHEN Yong zhang Guang-zhou CHEN wen LI Department of Mathematics Taizhou University Department of Mathematics Yancheng Teachers University College of Mathematics and Information Science Hebei Normal University

Nearly orthogonal Latin squares are useful for conducting experiments eliminating heterogeneity in two directions and using different interventions each at each *** this paper,some constructions of mutually nearly orthogonal Latin squares are *** is proved that there exist 3 MNOLS（2m） if and only if m ≥3 nd there exist 4 MNOLS（2m） if and only if m ≥4 with some possible exceptions.

关键词： Latin square orthogonal nearly orthogonal holey