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Approach for Obtaining Material Mechanical Properties in Local Region of Structure Based on Accurate Analysis of Micro-indentation Test

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Chinese Journal of Mechanical Engineering 2021年第6期34卷 147-158页

作者： He xue Jinxuan He Jianlong Zhang Yuxuan xue School of Mechanical Engineering Xi’an University of Science and TechnologyXi’an710054China Xi’an Special Equipment Inspection Institute Xi’an710065China Department of Industrial and Manufacturing Systems Engineering The University of Hong KongHong Kong999077China

The hot or cold processing would induce the change and the inhomogeneous of the material mechanical properties in the local processing region of the structure,and it is difficult to obtain the specific mechanical properties in these regions by using the traditional material tensile *** accurately get actual material mechanical properties in the local region of structure,a micro-indentation test system incorporated by an electronic universal material test device has been *** indenter displacement sensor and a group of special micro-indenter assemblies are estab-lished.A numerical indentation inversion analysis method by using ABAQUS software is also proposed in this *** on the above test system and analysis platform,an approach to obtaining material mechanical properties in the local region of structures is proposed and *** ball indentation test is performed and combined with the energy method by using various changed mechanical properties of 316L austenitic stainless steel under differ-ent *** investigated results indicate that the material mechanical properties and the micro-indentation morphological changes have evidently *** with the tensile test results,the deviations of material mechanical parameters,such as hardness H,the hardening exponent n,the yield strength σy and others are within 5%obtained through the indentation test and the finite element *** provides an effective and convenient method for obtaining the actual material mechanical properties in the local processing region of the structure.

关键词： Structural integrity assessment Micro-indentation test Numerical testing inversion analysis Local material mechanical property

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A Controlled Phase Gate with Nitrogen-Vacancy Centers in Nanocrystal Coupled to a Silica Microsphere Cavity

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Chinese Physics Letters 2010年第6期27卷 5-8页

作者： xue Peng Department of Physics Southeast University Nanjing 211189

We show how a controlled phase gate, induced by adiabatic passage of dark states, can be implemented with the nitrogen-vacancy defects in nanocrystal coupled to the optical whispering gallery mode in a silica microsphere cavity. The gate presented is robust to the fluctuations of the experimental parameters compared to the dynamical and geometric phases gates. The feasibility of this scheme is characterized by exact numerical simulations that incorporate various sources of experiment noise. The results demonstrate the practicality by way of current experimental technologies.

关键词： GATE array circuits NITROGEN POINT defects NANOCRYSTALS SILICA NUMERICAL analysis SIMULATION methods & models

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超前钻孔直径对高应力巷道卸压及掏槽爆破效果影响研究

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华北理工大学学报（自然科学版） 2025年第1期47卷 53-61页

作者：黄斌胡学龙安徽理工大学安徽省煤矿安全采掘装备制造业创新中心安徽淮南232001 中国矿业大学煤炭精细勘探与智能开发全国重点实验室江苏徐州221116 安徽理工大学矿业工程学院安徽淮南232001

随着煤炭开采逐步向深部推进,巷道开挖过程中应力集中问题日益突显,亟需有效解决。本文采用Ansys/Ls-Dyna数值模拟软件,针对高应力环境下不同超前钻孔直径对巷道卸压效果及掏槽爆破效果的影响进行了系统研究。利用ImageJ图像处理软件对... 详细信息

随着煤炭开采逐步向深部推进,巷道开挖过程中应力集中问题日益突显,亟需有效解决。本文采用Ansys/Ls-Dyna数值模拟软件,针对高应力环境下不同超前钻孔直径对巷道卸压效果及掏槽爆破效果的影响进行了系统研究。利用ImageJ图像处理软件对巷道掏槽爆破损伤云图进行了详细分析。结果表明,随着超前钻孔直径的增加,钻孔孔底至岩石内部区域的有效应力逐渐降低,有效实现了卸压作用;随着超前钻孔直径的增大,掏槽爆破岩石块度逐渐减少,小块度占比显著增加,且在大直径钻孔爆破中岩石块度的分布更为均匀。研究成果对提升高应力巷道掏槽爆破效果具有重要指导意义。

关键词：高应力超前钻孔掏槽爆破数值模拟

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Dehydration, hydrolysis and oxidation of cerium chloride heptahydrate in air atmosphere

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Journal of Rare Earths 2017年第11期35卷 1156-1163页

作者： Shoufeng xue Wenyuan Wu xue Bian Yongfu Wu Metallurgy School of Northeastern University Shenyang 110819 PR China School of Energy and Environmental Engineering Inner Mongolia University of Science and Technology Baotou 014010 PR China

The thermal decomposition of CeCl3·7 H2O was studied from room temperature to 800 ℃. Analysis was performed by applying TG-DTA, XRD, FESEM, EDXS, and TG-MS technologies to investigate the thermal decomposition mechanism of CeCl3·7 H2O in air atmosphere. Multiple forms of hydrated cerium chloride compound were observed in the dehydration products. The CeCl3hydrolysis product was separated by a continuous centrifugation method and the phase composition was identified as CeO2,Ce(OH)3,and CeCl3·4 H2O by XRD analysis. The evolved gas composition was identified as CI2and HCI by TG-MS system. Based on the analysis of the experimental results, the mechanism of thermal decomposition of CeCl3·7 H2O was proposed with completion of the dehydration reaction at 224 ℃,the hydrolysis reaction at 170-480 ℃,and the oxidation reaction of CeCl3above 480 ℃.

关键词： CeCl_3 Hydrolysis Oxidation XRD MS

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新型混编支架的制备与径向支撑力学行为

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中国组织工程研究 2025年第16期29卷 3440-3448页

作者：薛广明木合塔尔·克力木李洪新疆大学机械工程学院新疆维吾尔自治区乌鲁木齐市830047

背景:编织支架因良好的柔顺性被广泛应用于狭窄动脉的治疗,但在提供足够的径向支撑性能方面存在明显局限。目的:针对单一材料制成的编织支架存在径向支撑力不足的问题,采用不同力学参数的生物可降解材料混合编织支架,探究影响混编支架... 详细信息

背景:编织支架因良好的柔顺性被广泛应用于狭窄动脉的治疗,但在提供足够的径向支撑性能方面存在明显局限。目的:针对单一材料制成的编织支架存在径向支撑力不足的问题,采用不同力学参数的生物可降解材料混合编织支架,探究影响混编支架径向力学性能的影响因素。方法:在镁合金支架中引入铁合金纱线,采用有限元分析法对不同编织参数的混编支架进行参数化分析,通过与0.18 mm直径镁合金纱线制备的普通支架进行对比,评估其径向支撑力、径向回弹率和扩张不均匀性。结果与结论:①当铁合金纱线直径为0.18 mm和0.14 mm时,随着铁合金纱线数量的增多,混编支架的径向支撑力增加;此时,尽管直径0.14 mm铁合金纱线提供的径向支撑力小于同数量的0.18 mm铁合金纱线,但增加细铁合金纱线的数量可以达到与较粗铁合金纱线混编支架相媲美的径向支撑力。当铁合金纱丝直径为0.10 mm时,随着铁合金纱线数量的增加,混编支架的径向支撑力降低。②增大编织角度,混编支架的径向支撑力降低,但其径向回弹率和狗骨率得到了改善。通过降低编织角可以改善小直径铁合金纱线造成的支架径向支撑力不足。③结果显示,在镁合金支架中引入铁合金纱线,可以实现在不增加纱线直径的情况下精确地调整支架的径向力学性能,这不仅克服了单一材料支架的局限性,也为多材料支架的设计提供了新思路。

关键词：编织支架生物可降解材料镁合金铁合金支架结构径向支撑性能狗骨率有限元分析

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Galerkin approximation with Legendre polynomials for a continuous-time nonlinear optimal control problem

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Frontiers of Information Technology & Electronic Engineering 2017年第10期18卷 1479-1487页

作者： xue-song CHEN School of Applied Mathematics Guangdong University of TechnologyGuangzhou 510006China

We investigate the use of an approximation method for obtaining near-optimal solutions to a kind of nonlinear continuous-time(CT) system. The approach derived from the Galerkin approximation is used to solve the generalized Hamilton-Jacobi-Bellman(GHJB) equations. The Galerkin approximation with Legendre polynomials(GALP) for GHJB equations has not been applied to nonlinear CT systems. The proposed GALP method solves the GHJB equations in CT systems on some well-defined region of attraction. The integrals that need to be computed are much fewer due to the orthogonal properties of Legendre polynomials, which is a significant advantage of this approach. The stabilization and convergence properties with regard to the iterative variable have been *** examples show that the update control laws converge to the optimal control for nonlinear CT systems.

关键词： Generalized Hamilton-Jacobi-Bellman equation Nonlinear optimal control Galerkin approximation Legendre polynomials

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Experimental Study on Inducement and Development of Flow Instabilities in a Centrifugal Compressor with Different Diffuser Types

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Journal of Thermal Science 2020年第2期29卷 435-444页

作者： xue Xiang WANG Tong Gas Turbine Research Institute Shanghai Jiao Tong UniversityShanghai 200240China

A centrifugal compressor is a typical compressed air energy storage device. In order to ensure the safety of the compressed energy storage process in the compressor, the internal unsteady flow phenomena need to be closely monitored, especially some serious ones like stall and surge. It is necessary to explore the mechanism of flow instabilities under different conditions. A centrifugal air compressor was tested with a vaneless diffuser and a variable vaned diffuser with five different vane setting angles, respectively. Various diffuser types resulted in various modes of flow instabilities prior to surge. The vaneless region between the impeller and the diffuser was focused on. Multiple high-speed sensors were arranged along the circumferential direction. The pressure signals at all these positions were being measured and collected in real time as the compressor was slowly throttled into surge. This paper emphasizes on the influence of matching between the impeller and the diffuser on the flow instability. The experimental results showed that the diffuser vane setting angle affected the stall characteristics. Due to the asymmetry of the volute, the circumferential pressure distribution was always severely distorted prior to surge. A high-pressure region appeared near the volute tongue, and a low-pressure region was formed away from the volute tongue. In the case of the vaned diffuser with non-design installation angle and the vaneless diffuser, the rotating stall signal was originated in the low-pressure region and propagated circumferentially. However, in the case of the vaned diffuser with the design installation angle, the circumferential high-pressure region became the most sensitive region for the generation of stall, and another form of instability occurred there. Both the inducement and development of these flow instabilities have been studied. The dynamic experimental research on the compressor matching different types of diffusers could be a good case supple

关键词： compressed air energy storage centrifugal compressor flow instability stall

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Entangling Gate of Dipolar Molecules Coupled to a Photonic Crystal

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Chinese Physics Letters 2011年第5期28卷 38-41页

作者： xue Peng Department of Physics Southeast UniversityNanjing 211189

A hybrid entangling gate is proposed by using the coherent interaction between dipolar molecules and a photonic crystal microcavity,which is effected by virtual electric dipole *** is included in the present model and... 详细信息

关键词： transitions coherent dipole

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Intelligent Assessment of Active and ReactivePower Flow with Satisfying Accuracy forN-k_(1)-k_(2) Cascading Outages

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Journal of Modern Power Systems and Clean Energy 2021年第5期9卷 986-999页

作者： Yusheng xue Yun Liu NARI Group Corporation(State Grid Electric Power Research Institute) NanjingChina School of Electrical Engineering Shandong UniversityJinanChina

Addressed to the N-k_(1)-k_(2) cascading outages,it is computationally burdensome for the reliable calculation of active and reactive power *** paper builds a comprehensive framework with three algorithms,including the distribution factor(DF),the Newton-Raphson(NR),and the first iteration of NR algorithm(termed as 1J).Classifiers are designed to determine whether the NR algorithm should be employed for *** features are extracted upon the analytical error of *** reactive power is partially considered in the 1J but neglected in the DF algorithm,the deviation between the solutions is taken as one crucial *** support vector machine(SVM)is then utilized for classifier *** the deep integration of the causal inference and the statistical paradigm,this framework calculates active and reactive power flows rapidly,reliably,and *** effectiveness and robustness are fully validated in three typical IEEE systems.

关键词： Active power flow algorithm coordination causal algorithm integration of research paradigms N-k_(1)-k_(2)cascading outage reactive power flow

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A multiscale view in functional materials

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Progress in Natural Science:Materials International 2022年第6期32卷 674-683页

作者： Guoqiang Shi Dongfeng xue Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

Functional materials show various highly demanded performances originating from intrinsic features related to degrees of freedom in a lattice ***,deep physical or chemical insights of quantum materials stimulate researchers to clarify multiscale processes within both materials and devices,which may be understood as functional materials that possess energy origin beyond electron *** is of great significance for the design of functional materials to understand the sources of properties of functional materials from the perspective of multi degrees of freedom via multiscale research *** short review illustrates the importance and explores the energy source of functional materials from multiple degrees of freedom ***,we analyzed the multiple degrees of freedom within lithium niobate single crystals to clarify their multiscale *** short review may,in some cases,provide a perspective for enhancing research scopes of functional materials and recommending some methodologies from multiple degrees of freedom perspectives.

关键词： Degrees of freedom Functional crystals Lithium niobate

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