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Exploring the Possibility of Deformation Twinning in Pure Aluminum

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Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 647-651页

作者： Tuo Cai zhen-jun Zhang Jin-Bo Yang Zhe-feng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences

Can aluminum generate deformation twins？ Contradictories exist among the experimental results, theoretical predictions, and molecular dynamics simulations. Our first-principles calculations based on the full-potential linearly augmented plane wave method show that the bonding electron density of aluminum gathers at the tetrahedral interstices, and this specific electronic structure is in agreement with the experimental data from quantitative convergent-beam electron diffraction. In terms of this characteristic, the matching between the cohesive energy of local deformation twins with different thickness and global matrix can shed light on deformation twins in aluminum. This study may give a lane to insight into deformation twins in different metals.

关键词： Metals and alloys Deformation twinning First-principles Density functional theory

Study on the Nonlinear Tension-Torsion Coupled Stiffness of the High-Current Composite Umbilical Considering the Thermal Effect

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China Ocean Engineering 2022年第4期36卷 588-600页

作者： YAN jun SU Qi BU Yu-feng LU Qing-zhen YANG Zhi-xun State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116024China Ningbo Institube of Dalian University of Technology Ningbo 315040China State Key Laboratory of Structural Analysis for Industrial Equipment School of Ocean Science and TechnologyDalian University of TechnologyPanjin 124221China Institute of marine machinery College of Mechanical and ElectricalEngineering Harbin Engineering UniversityHarbin 150001China

The gradual advances of offshore oil and gas exploitation and the development tendency of equipment integration have prompted the design of a new type of the high-current composite umbilical to meet development *** order to study the mechanical behavior of the high-current composite umbilical(HCCU)and provide design suggestions,a theoretical analysis framework of the tension-torsion coupled behavior of the spirally wound structure is proposed,which focuses more on the radial mechanical ***,by considering the mechanical and thermal conditions during the operation of HCCU,a semi-analytical method of the tension and torsion stiffness of the high-current composite umbilical considering the temperature effect is ***,a practical case of HCCU is given,and the thermal effect on the radial and axial mechanical behaviors are *** is found that the thermal effect has a significant influence on the radial stiffness,and shows non-linear variation ***,the sensitivity analysis is carried out to study the influence of the design parameter on the stiffness of tension and *** results indicated that the equivalent radial stiffness and helical angle have obvious effect on the tension-torsion coupled stiffness,which can provide reasonable reference for the design of HCCU.

关键词： high-current composite umbilical tension-torsion coupled thermo-mechanical coupled radial stiffness

Adhesive Contact of Elastic Solids with Self-Affine Fractal Rough Surfaces

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Acta Mechanica Solida Sinica 2024年第2期37卷 265-270页

作者： Xuan-Ming Liang Shi-Wen Chen Si-He Wang zhen-Yuan Gong jun feng Gang-feng Wang Department of Engineering Mechanics SVL and MMMLXi’an Jiaotong UniversityXi’an710049China OPPO Mobile Telecommunications Corporation Ltd. Dongguan523860China

The elastic adhesive contact of self-affine fractal rough surfaces against a rigid flat is simulated using the finite element method. An array of nonlinear springs, of which the force-separation law obeys the Lennard–Jones potential, is introduced to account for the interfacial adhesion. For fractal rough surfaces, the interfacial interaction is generally attractive for large mean gaps, but turns repulsive as the gap continuously shrinks. The interfacial interactions at the turning point corresponding to the spontaneous contact are shown for various surfaces. For relatively smooth surfaces, the probability density distributions of repulsion and attraction are nearly symmetric. However, for rougher surfaces, the simulation results suggest a uniform distribution for attraction but a monotonously decreasing distribution with a long tail for repulsion. The pull-off force rises with increasing ratio of the work of adhesion to the equilibrium distance, whereas decreases for solids with a higher elastic modulus and a larger surface roughness. The current study will be helpful for understanding the adhesion of various types of rough solids.

关键词： Fractal rough surfaces Adhesion Contact mechanics Lennard-Jones potential

Revolutionizing breast cancer detection:Advances in fluorescent probe technology

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Nano Research 2025年第1期18卷 653-674页

作者： Qian Gao Lin Tang jun Zhan Yiyuan Xue feng Luo State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases West China Hospital of StomatologySichuan UniversityChengdu 610041China Emergency Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Obstetrics and Gynecology West China Second University HospitalSichuan UniversityChengdu 610041China Department of Prosthodontics West China School of StomatologySichuan UniversityChengdu 610041China

With the increasing incidence of breast cancer globally,there is an urgent demand for enhanced diagnostic and therapeutic *** comprehensive review explores advancements in fluorescent probe technology for breast cancer imaging and early *** probes offer unparalleled sensitivity and specificity in detecting cancer biomarkers,enabling early diagnosis and delineation of tumor margins during *** categorize these probes into molecular,nano,ratiometric,the second near-infrared window(NIR-II),and multifunctional varieties,each with unique capabilities for targeting specific cancer *** review highlights recent innovations in probe design,emphasizing their applications in pathogenesis studies,drug development,precision medicine,and fluorescence-guided *** their promising clinical potential,challenges such as safety,biomarker targeting accuracy,system compatibility,and clinical translation *** these hurdles is crucial for the integration of fluorescent probes into standard cancer care,aiming to improve treatment outcomes and patient quality of life.

关键词： breast cancer fluorescent probes imaging early diagnosis biomarker

Microstructural evolution and properties of a Cu-Cr-Ag alloy during continuous manufacturing process

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Rare Metals 2021年第8期40卷 2213-2220页

作者： Gao-Lei Xu Li-jun Peng Guo-Jie Huang Hao-feng Xie zhen Yang Xue feng Xiang-Qian Yin Xu-jun Mi State Key Laboratory of Nonferrous Metals and Processes GRIMAT Engineering Institute Co.Ltd.Beijing101417China Zhejiang Libo Industrial Co. Ltd.Shaoxing312050China

Microstructure evolution and properties of a Cu-Cr-Ag alloy during the continuous manufacturing process were investigated in detail by scanning electron microscopy(SEM)and transmission electron microscopy(TEM)in the *** Cu-Cr-Ag alloy rod with uniform compositions is fabricated by upward continuous casting *** of the Cr phases are observed in the ascast *** the continuous extrusion process,the severe shear deformation and the dynamic aging *** average grain size of as-extruded alloy is much smaller than that of as-cast *** fcc and bcc Cr precipitates appear in the *** interaction mode between dislocations and precipitates can be identified as Orowan bypass mode according to the TEM *** overall difference in the yield strength between as-cast and as-extruded Cu-Cr-Ag alloy is attributed to solid solution strengthening,grain refinement strengthening,precipitation hardening and working hardening.

关键词： Cu-Cr-Ag alloy Upward continuous casting Continuous extrusion Microstructure Physical properties

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带扇叶形锚固板钢筋机械锚固性能试验研究

An efficient method to synthesize HMX by nitrolysis of DPT with N_2O_5 and a novel ionic liquid

工程力学 2025年第1期42卷 74-82页

作者：吴琛姚鹏飞陈真锋邓芬福建理工大学福建省土木工程新技术与信息化重点实验室福州350118 锦曦控股集团有限公司福州350017

为避免型钢混凝土节点钢筋锚固时导致的大量型钢穿孔或钢筋焊接，设计一种新型扇叶形锚固板，并通过带扇叶形锚固板钢筋中心拔出试验，分析锚固板形式、钢筋直径、锚固长度对带锚固板钢筋机械锚固性能的影响。试验结果表明：带扇叶型锚... 详细信息

为避免型钢混凝土节点钢筋锚固时导致的大量型钢穿孔或钢筋焊接，设计一种新型扇叶形锚固板，并通过带扇叶形锚固板钢筋中心拔出试验，分析锚固板形式、钢筋直径、锚固长度对带锚固板钢筋机械锚固性能的影响。试验结果表明：带扇叶型锚固板钢筋可避开抗剪栓钉，具有施工方便的优点，同时拥有良好的锚固性能;当钢筋锚固长度为5d~7d时，发生混凝土劈裂破坏，当锚固长度为8d~12d时，发生钢筋拉断破坏，且钢筋的锚固系数大于1.25，具有良好的锚固性能;带扇叶形锚固板钢筋极限粘结强度随钢筋直径、钢筋锚固长度增大而减小，建议钢筋的锚固长度取为8d;提出了适用于带扇叶形锚固板钢筋极限粘结强度的计算公式，能较准确地反映扇叶形锚固板对混凝土产生的挤压和劈裂作用。

关键词：扇叶型锚固板中心拔出试验机械锚固性能极限粘结强度型钢混凝土节点

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Chinese Chemical Letters 2009年第4期20卷 379-382页

作者： Hui zhen Zhi jun Luo Guang An feng Chun Xu Lv School of Chemical Engineering Nanjing University of Science and Technology Nanjing 210094 China

A novel polyethylene glycol （PEG）-200-based dicationic acidic ionic liquid （PEG200-DAIL） was used to synthesize HMX from DPT by nitrolysis with N2O5. It was found that either N2O5 or PEGzoo-DAIL could improve the yield. Furthermore, the combined use of PEG200-DAIL and N2O5 could increase the yield of HMX to 64% with the used quantity of HNO3 decreased dramatically.

关键词： DPT Nitrolysis N2O5 Acidic ionic liquid

A Novel Method for Achieving Gradient Microstructure in a Cu-Al Alloy:Surface Spinning Strengthening (3S)

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Acta Metallurgica Sinica(English Letters) 2017年第3期30卷 212-217页

作者： Chuan-Xi Ren QiangWang zhen-jun Zhang Yan-Kun Zhu Zhe-feng Zhang Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China

A new designed surface strengthening method, surface spinning strengthening （3S）, was applied to achieve gradient microstructure in the surface layer of a Cu-11 at.%A1 alloy. According to the level of grain refinement, the gradient microstructure can be divided into four zones, including nanoscale grain zone, ultra-fine grain zone, fine grain zone and coarse grain zone from the surface to the matrix. Meanwhile, a plenty of grain boundaries and twin boundaries were introduced to inhibit the dislocation motion in the surface layer during the plastic deformation process. Consequently, the hardened layer with a microhardness gradient and high residual compressive stress was produced on the samples, and the yield strength of the Cu-11 at.%A1 alloy was effectively improved after 3S processing due to the strengthening effect caused by the gradient microstructurc.

关键词： Cu-AI alloy Surface spinning strengthening (3S) Strength Microhardness Gradientmicrostructure

Resuscitation therapy for traumatic brain injuryinduced coma in rats:mechanisms of median nerve electrical stimulation

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Neural Regeneration Research 2015年第4期10卷 594-598页

作者： zhen feng Ying-jun Zhong Liang Wang Tian-qi Wei Department of Rehabilitation Medicine the First Affiliated Hospital of Nanchang University

In this study, rats were put into traumatic brain injury-induced coma and treated with median nerve electrical stimulation. We explored the wake-promoting effect, and possible mechanisms, of median nerve electrical stimulation. Electrical stimulation upregulated the expression levels of orexin-A and its receptor OX1R in the rat prefrontal cortex. Orexin-A expression gradually in-creased with increasing stimulation, while OX1R expression reached a peak at 12 hours and then decreased. In addition, after the OX1R antagonist, SB334867, was injected into the brain of rats after traumatic brain injury, fewer rats were restored to consciousness, and orexin-A and OXIR expression in the prefrontal cortex was downregulated. Our ifndings indicate that median nerve electrical stimulation induced an up-regulation of orexin-A and OX1R expression in the pre-frontal cortex of traumatic brain injury-induced coma rats, which may be a potential mechanism involved in the wake-promoting effects of median nerve electrical stimulation.

关键词： nerve regeneration traumatic brain injury coma median nerve electrical stimulation wake-promoting orexin-A OX1R NSFC grants neural regeneration