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Damage analysis caused by ^(60)Co ions in functionally graded materials

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Defence Technology(防务技术) 2025年第2期44卷 248-256页

作者： z.beyde Öz.an Ugur gökmen Sema Bilge Ocak Department of Advanced Technologies Graduate School of Natural and Applied SciencesGazi UniversityAnkara06560Turkiye Department of Metallurgical and Materials Engineering Faculty of TechnologyGazi UniversityAnkara 06560Turkiye Basic and Engineering Sciences Central Laboratory Application and Research Center Gazi UniversityAnkara 06560Turkiye

Functionally graded composite/hybrid materials(FgCM/FgHCM)were produced by adding B_(4)C,TiO_(2),and B_(4)C+TiO_(2)ceramic materials at various ratios(0-50%)into the AA6082 *** analysis of the damage caused by^(60) ions'(1.173-1.1332 MeV)on the material was examined using the SRIM/TRIM Monte Carlo simulation *** the simulation,the following data regarding the atoms of the target materials were obtained:ion distribution,target ioniz.tion,total displacements,surface binding energy,lattice binding energy,and displacement *** the studied four materials,the one with the highest ion range value was found to be AA6082 with ***_(2)was found to be the reinforcement material that reduced the ion range the most in the *** to its high binding energy,B_(4)C reinforced AA6082+(0-50%)B_(4)C FgCM was found to have the least vacancy with 4782/ion.

关键词： SRIM/TRIM Damage analysis AA6082 ^(60)Co ion

Thermal fracture analysis of two collinear cracks in a functionally graded medium based on the three-phase-lag model

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Applied Mathematics and Mechanics(English Edition) 2025年第3期46卷 501-520页

作者： z.angna XUE Huameng WANg Jianlin liu Minjie WEN z.T.CHEN College of Pipeline and Civil Engineering China University of Petroleum(East China) School of Civil Engineering and Architecture Zhejiang Sci-Tech University Department of Mechanical Engineering University of Alberta

The three-phase-lag(TPL) heat conduction model is an accurate representation of the actual heat transfer process. It would be interesting to investigate how the TPL model affects the thermal fracture behavior when there are defects existing in the medium. This paper aims to analyz. the thermoelastic responses of two collinear cracks within a functionally graded half-space under thermal loadings by means of the TPL model. The thermoelastic problem is transformed into a series of singular integral equations using the integral transformation methods. The transient temperature and stress intensity factors(SIFs) are obtained through the application of Chebyshev *** effects of crack spacing and non-homogeneous parameters on the transient thermoelastic responses are presented, and the results of the TPL model are compared with those of the Fourier model, Cattaneo and Vernotte(CV) model, and dual-phase-lag(DPL)model. It is shown that crack spacing and non-homogeneous parameters have important effects on the thermoelastic responses, and the fluctuation phenomenon under the TPL model is the most pronounced due to the existence of the thermal displacement lag term.

关键词： Chebyshev polynomials

Narrative nursing as a holistic approach in modern healthcare:Integrating emotional and physical care

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World Journal of Psychiatry 2025年第3期15卷 348-352页

作者： güz.l Nur Yıldız.BaharÇiftçi Department of Dialysis MuşAlparslan UniversityMuş40199Türkiye Department of Fundamental Nursing Atatürk UniversityErzurum 25240Türkiye

Narrative nursing(NN)is emerging as a critical approach in modern healthcare,addressing the complex interplay between psychological well-being and physical *** manuscript discusses a study on NN and its role in alleviating psychological distress in patients with acute pancreatitis,published in the World Journal of *** research demonstrates that NN,through structured storytelling,significantly reduces anxiety and depression,thereby enhancing patient satisfaction and fostering emotional *** therapeutic approach extends beyond symptom management,offering a comprehensive strategy that supports the mental and emotional recovery of patients facing severe health *** provides a unique framework for engaging patients in their care journey,promoting a sense of agency,and strengthening the patient-provider *** this manuscript,we explore the broader implications of NN by synthesiz.ng findings from various studies,showing that NN is effective not only in acute settings but also in oncology,chronic illness management,and palliative *** evidence indicates that integrating NN into standard clinical practice could enhance healthcare outcomes by addressing the holistic needs of patients,supporting psychological resilience,and fostering a compassionate healthcare environment.

关键词： Narrative nursing Patient-centered care Psychological distress Emotional resilience Holistic recovery Structured storytelling

NEW VIEW ABOUT BAINITIC TRANSFORMATION IN STEEL

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 229-234页

作者： liu, C.C. liu, z. Chen, g.X. Tsinghua Univ Beijing China

The bainitic transformation was analyz.d according to the factors such as morphology, crystallography, mechanical property of bainite and transformation kinetics. It was found that the bainitic transformation is controlled by displacive mechanism and self-tempering of displacive microstructure, i.e. bainite is the product of such procedure during which undercooled austenite first transforms into one certain displacive microstructure by displacive mechanism and then this microstructure experiences self-tempering. With this idea, several questions that can not be illustrated only by displacive transformation mechanism can be explained successfully.

关键词： Bainite Morphology Steel

Construction of attapulgite-based one-dimensional nanonetwork composites with corrosion resistance for high-efficiency microwave absorption

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 689-698页

作者： Kai Xu Qingqing gao Shaoqi Shi Pei liu Yinxu Ni z.ilei Hao gaojie Xu Yan Fu Fenghua liu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China z.ejiang Key Laboratory of Additive Manufacturing Materials Ningbo Institute of Materials Technology&EngineeringChinese Academy of SciencesNingbo 315201China Northwest Yongxin Coatings Limited Company Lanzhou 730046China

Exploring high-efficiency and broadband microwave absorption(MA)materials with corrosion resistance and low cost is ur-gently needed for wide practical ***,the natural porous attapulgite(ATP)nanorods embedded with TiO_(2)and polyaniline(PANI)nanoparticles are synthesiz.d via heterogeneous precipitation and in-situ *** obtained PANI-TiO_(2)-ATP one-di-mensional(1D)nanostructures can intertwine into three-dimensional(3D)conductive network,which favors energy *** min-imum reflection loss(RL_(min))of the PANI-TiO_(2)-ATP coating(20wt%)reaches-49.36 dB at 9.53 gHz.and the effective absorption band-width(EAB)can reach 6.53 gHz.with a thickness of 2.1 *** excellent MA properties are attributed to interfacial polariz.tion,mul-tiple loss mechanisms,and good impedance matching induced by the synergistic effect of PANI-TiO_(2)nanoparticle shells and ATP *** addition,salt spray and Tafel polariz.tion curve tests reveal that the PANI-TiO_(2)-ATP coating shows outstanding corrosion resist-ance *** study provides a low-cost and high-efficiency strategy for constructing 1D nanonetwork composites for MA and corrosion resistance applications using natural porous ATP nanorods as carriers.

关键词： microwave absorption corrosion resistance attapulgite TiO_(2) polyaniline

Quantum convolution inequalities on Frobenius von Neumann algebras

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Science China Mathematics 2025年第3期68卷 615-636页

作者： Linz.e Huang z.engwei liu Jinsong Wu Beijing Institute of Mathematical Sciences and Applications Yau Mathematical Sciences Center and Department of Mathematics Tsinghua University

In this paper, we introduce Frobenius von Neumann algebras and study quantum convolution inequalities. In this framework, we unify quantum Young's inequality on quantum symmetries such as subfactors,and fusion bi-algebras studied in quantum Fourier analysis. Moreover, we prove quantum entropic convolution inequalities and characteriz. the extremiz.rs in the subfactor case. We also prove quantum smooth entropic convolution inequalities. We obtain the positivity of comultiplications of subfactor planar algebras, which is stronger than the quantum Schur product theorem. All these inequalities provide analytic obstructions of unitary categorification of fusion rings stronger than the Schur product criterion.

关键词： Frobenius von Neumann algebra quantum Young's inequality quantum entropic convolution inequality unitary categorification

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FINITE ELEMENT MODEL AND SIMULATION OF ROTARY FORgINg OF A DISC

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 470-475页

作者： g.liu, S. J. Yuan, z. R. Wang and T. Xie 1) Harbin Institute of Technology, Harbin 150001, China 2) Harbin Huasheng Coorpration, Harbin 150001, China

The rotary forging process of a disc is simulated by 3-D finite element *** motion of the rotary the is described as the combination of a revolution round the machine axis and a spin round the rotary die axis. Therefore, the workpiece can be loaded and unloaded partly and cyclically by the cone surface of the rotary the continuously, according with the practical rotary forging process. From the siumulation rasults, the causes of center-thinning during rotary forging of discs are that the locally loading of rotary die made the workpiece center get high radial and tangential tensile stresses, and then the shortening in axial direction and the elongating in tangential and radial direction occur continuous- ly.

关键词： finite element simulation rotary forging,disc center-thinning

LOW CYCLE FATIgUE BEHAVIOR OF Az.1HP ALLOY IN AS HIgHP RESSURE DIE CASTINg

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 961-966页

作者： liu, z. Xu, Y.Y. Wang, z.g. Wang, Y. liu, z.Y. Inst of Metal Research Chinese Acad of Sciences Shenyang China

Fully reversed total strain-controlled low-cycle fatigue tests were conducted at room temperature in air to study the fatigue behavior of Az.1HP magnesium alloy in as high pressure die casting and subsequently heat treatment. All the specimens in different heat histories exhibit cyclic strain hardening in different degrees. It is difficult to distinguish the fatigue behavior of the die casting specimens from that of the solution aging specimens. The solution treated specimens show longer fatigue life at high strain amplitude and shorter fatigue life at low strain amplitude than the die casting and solution aging specimens though they have the lowest yield strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 show very similar to those found by monotonic tensile tests. The SEM examination reveals that the regions of fatigue crack growth and final fracture can be characteriz.d by quasi-cleavage mechanisms, but some shallow dimples, slip bands and secondary cracks are found on the fracture surface in the fracture crack growth areas.

关键词： Cracks Die casting Fatigue of materials Heat treatment

Constructing Ti_(3)C_(2)T_(x)-MXene-based gradient woodpile structure by direct ink writing 3D printing for efficient microwave absorption

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International Journal of Minerals,Metallurgy and Materials 2025年第3期32卷 657-667页

作者： Changtian z.u Pei liu Jin Chen z.xuan Ding guohui Tang Qingqing gao Yinxu Ni Kai Xu z.ilei Hao gaojie Xu Fenghua liu School of Materials Science and Chemical Engineering Ningbo UniversityNingbo 315211China Ningbo Institute of Materials Technology&Engineering Chinese Academy of SciencesNingbo 315201China

As a novel 2D material,Ti_(3)C_(2)T_(x)-MXene has become a major area of interest in the field of microwave absorption(MA).However,the MA effect of common Ti_(3)C_(2)T_(x)-MXene is not prominent and often requires complex processes or combinations of other ma-terials to achieve enhanced *** this context,a kind of gradient woodpile structure using common Ti_(3)C_(2)T_(x)-MXene as MA ma-terial was designed and manufactured through direct ink writing(DIW)3D *** minimum reflection loss(RL_(min))of the Ti_(3)C_(2)T_(x)-MXene-based gradient woodpile structures with a thickness of less than 3 mm can reach-70 dB,showing considerable improve-ment compared with that of a completely filled *** addition,the effective absorption bandwidth(EAB)reaches 7.73 *** study demonstrates that a Ti_(3)C_(2)T_(x)-MXene material with excellent MA performance and tunable frequency band can be successfully fab-ricated with a macroscopic structural design and through DIW 3D printing without complex material hybridiz.tion and modification,of-fering broad application prospects by reducing electromagnetic wave radiation and interference.

关键词： Ti_(3)C_(2)T_(x)-MXene electromagnetic wave absorption macro-design impedance matching 3D printing ink