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Mechanical properties and failure modes of stratified backfill under triaxial cyclic loading and unloading

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International Journal of Mining Science and Technology 2019年第5期29卷 809-814页

作者： Wang Jie song weidong Cao Shuai Tan Yuye School of Civil and Resource Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education Beijing 100083China

Multiple filling of gobs will lead to a layered structure of the *** explore the influence of layering structure on the mechanical properties and failure modes of backfill,different backfill specimens were prepared with a cement/sand ratio of 1:4,a slurry concentration of 75%,and backfilling times of 1,2,3 and 4,*** cyclic loading and unloading experiments were carried *** results show that with an increase in backfilling time,the peak strength of backfill decreases as a polynomial function and the peak strain increases as an exponential *** cyclic load enhances the linear characteristic of backfill *** loading and unloading deformation moduli have a linear negative correlation with the backfilling *** unloading deformation modulus is always slightly higher than the loading deformation *** failure modes of stratified backfill are mainly characterized by conjugate shear failure at the upper layer and tensile failure across the layer plane,and there is usually no damage in the lower layer away from the loading area.

关键词： Stratified backfill Triaxial cyclic loading and unloading Mechanical properties Failure modes Deformation modulus

基于知识图谱的创新创业教育在“材料科学基础”中的教学实践

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科教导刊 2024年第27期 102-104页

作者：张弛禹庭宋伟东五邑大学应用物理与材料学院广东江门529020

在国家创新创业教育政策的推动下,五邑大学积极改革专业课程的教学内容和方法,致力于培养面向地方产业的应用型卓越人才。文章针对“材料科学基础”课程中存在的知识点多而杂、内容抽象等问题,基于知识图谱,分割知识点并用创新创业案例... 详细信息

在国家创新创业教育政策的推动下,五邑大学积极改革专业课程的教学内容和方法,致力于培养面向地方产业的应用型卓越人才。文章针对“材料科学基础”课程中存在的知识点多而杂、内容抽象等问题,基于知识图谱,分割知识点并用创新创业案例关联每个知识点,旨在通过引入产业案例和科研案例,使学生能在学习过程中直观地理解材料科学知识的实际应用。知识图谱的应用为学生提供了一个结构化的知识框架,有助于他们构建系统化的知识体系。通过“材料科学基础”课程改革实践,不仅提升了学生的学习积极性和创新能力,还为学生提供了一个将理论知识与实践应用相结合的平台,培养了学生的工程实践能力和解决复杂问题的能力。

关键词：材料科学基础知识图谱创新创业能力案例分析

解剖型锁定钛板与髓内钉治疗胫骨远端骨折的疗效比较

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中山大学学报（医学科学版） 2024年第1期45卷 108-113页

作者：马梦君陈彦博曾钢陈宸宋卫东刘文宙中山大学附属第八医院骨外科广东深圳518033 中山大学孙逸仙纪念医院骨外科广东广州510000

【目的】对比应用解剖型锁定钛板与髓内钉治疗胫骨远端骨折的临床疗效与并发症情况。【方法】自2019年9月至2021年9月,于中山大学孙逸仙纪念医院诊断为胫骨远端AO-A型骨折的手术患者纳入本研究,共32例。其中15例采用钛板螺钉治疗,17例... 详细信息

【目的】对比应用解剖型锁定钛板与髓内钉治疗胫骨远端骨折的临床疗效与并发症情况。【方法】自2019年9月至2021年9月,于中山大学孙逸仙纪念医院诊断为胫骨远端AO-A型骨折的手术患者纳入本研究,共32例。其中15例采用钛板螺钉治疗,17例采用髓内钉治疗。比较两组一般手术指标、骨折愈合时间、术后并发症发生情况、手术前后VAS评分及术后踝关节功能。【结果】患者均获得随访,随访时间10~20个月,平均12个月。髓内钉组手术时间、术中透视次数均长于钛板螺钉组,但术前等待时间、住院天数少于钛板螺钉组,统计学差异显著(P0.05);术后6周,两组VAS评分均低于术前,统计学差异显著(P0.05);术后6月AOFAS评分、术后1年踝关节活动度、并发症发生率髓内钉组优于钛板螺钉组,统计学差异显著(P0.05)。【结论】钛板螺钉与髓内钉均是治疗胫骨远端AO-A型骨折的有效术式,远期临床疗效无明显差异。髓内钉的软组织并发症较少,对踝关节活动度影响更小,康复更快,安全性更高,而钛板螺钉发生术后软组织感染的概率较大。我们建议在临床工作中,应该做好患者的术前评估,在把握适应症的前提下,髓内钉并发症更少,有一定优势。

关键词：胫骨远端骨折解剖型锁定钛板髓内钉治疗疗效

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混合储能微电网新能源多时段动态调度方法

电子设计工程 2024年第9期32卷 11-14页

作者：周晓东宋卫东朱柯许继电气股份有限公司河南许昌461000

由于对电量的需求不断增大,混合储能微电网的日常发电成本不断增长,为有效降低发电成本,优化发电的经济效益性,提出混合储能微电网新能源多时段动态调度方法。以柴油发电系统、可再生能源发电系统运行成本与负荷收益为优化目标,设定发... 详细信息

由于对电量的需求不断增大,混合储能微电网的日常发电成本不断增长,为有效降低发电成本,优化发电的经济效益性,提出混合储能微电网新能源多时段动态调度方法。以柴油发电系统、可再生能源发电系统运行成本与负荷收益为优化目标,设定发电容量与系统平衡约束;利用日前优化调度结果,将调度时间区间缩短至15 min,细化预测结果,实现日内循环调度;结合烟花算法和多目标灰熵算法,求解日内循环调度模型,完成新能源多时段动态调度。经实验验证可知,通过该方法调度后的柴发机组在峰时段发电功率得到显著降低,同时风电机组与光伏机组可以在不同时段完成有效配合,使两者调度后的功率降低,能够保障不同时段下的备用容量。

关键词：混合储能微电网新能源多时段动态调度发电功率

Numerical simulation of land subsidence and verification of its character for an iron mine using sublevel caving

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International Journal of Mining Science and Technology 2016年第2期26卷 327-332页

作者： Cao Shuai song weidong Deng Dan Lei Yuankun Lan Jianqiang School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education Beijing 100083China Zhenjiang Institute of Geology for Mineral Resources Zhenjiang 212003China Chengchao Iron Mine Wuhan Iron&Steel Group Minerals Co.Ltd.Wuhan 430080China

Combined with a digital bored photography system and in-situ statistics concerning the joints and fissures of both ore-body and surrounding rock,a 2D discrete model was constructed using *** stress field and displacement field changes of different sublevel stoping systems were also *** in the overlying rock strata settlement pattern has been analyzed and validated by in-situ monitoring *** results show that:in the caving process,there exists an obvious delay and jump for the overlying rock strata displacement over time,and a stable arch can be formed in the process of caving,which leads to hidden *** by the mining activity,a stress increase occurred in both the hanging wall and the foot wall,demonstrating a hump-shaped distribution *** the comparison between simulation results and in-situ monitoring results,land subsidence shows a slow-development,suddenfailure,slow-development cycle pattern,which leads eventually to a stable *** pattern validates the existence of balanced arch and hidden goafs.

关键词： Block caving Joint survey UDEC model Ground settlement Balanced arch Hidden goafs

A Class of Dually Flat Spherically Symmetric Finsler Metrics

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Journal of Mathematical Research with Applications 2021年第2期41卷 171-182页

作者： weidong song Yali CHEN School of General Education and Foreign Languages Anhui Institute of Information Technology School of Mathematics and Statistics Anhui Normal University

In this paper, we study spherically symmetric Finsler metrics. By analysing the solution of the spherically symmetric dually flat equation, we construct several new families of dually flat spherically symmetric Finsle... 详细信息

关键词： spherically symmetric Finsler metrics dually flat

Phase formation,texture evolutions,and mechanical behaviors of Al0.5CoCr0.8FeNi2.5V0.2 high-entropy alloys upon cold rolling

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Progress in Natural Science:Materials International 2022年第2期32卷 196-205页

作者： Tongtong Sun weidong song Feilong Shan Kaikai song Kun Zhang Chuanxiao Peng Honggang Sun Lina Hu School of Mechanical Electrical & Information Engineering Shandong University State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology CAS Key Laboratory of Microgravity (National Microgravity Laboratory) Institute of Mechanics Chinese Academy of Sciences Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education) Shandong University

The cold rolling(CR) reduction dependence of microstructure evolutions and mechanical properties for Al0.5CoCr0.8FeNi2.5V0.2high-entropy alloy(HEA) were *** HEA remains FCC structures consisting of nanoscale ordered L12phase,confirming the phase formation *** increasing CR reduction,the textures transform from random ones to FCC rolling ones accompanied by dense slip bands and deformation *** a 50% CR reduction,the deformation textures started to become evident and were governed by typical {111}F,{110}Goss and {112}Cu texture *** the CR reduction approached 90%,the deformation textures mainly contained the {110}A,{114}X,and {112}Cu texture *** a result,both Vickers hardness and ultimate strength increased,but the ductility decreased *** enhanced strength should be attributed to the anisotropy and work hardening behavior from *** plastic deformation for the samples under low CR reductions was dominated by deformation twins and slip ***,under high CR reductions,the textures severely impeded the further propagation of pre-existing slip bands,leading to the rapid decrease of ***,the CR reduction should be carefully designed before optimal heat treatments to enhance the strength and ductility synergy.

关键词： High-entropy alloys Cold rolling Texture Mechanical property Ductility

A Class of Projectively Flat Spherically Symmetric Finsler Metrics

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Journal of Mathematical Research with Applications 2015年第2期35卷 215-222页

作者： weidong song Yali CHEN School of Mathematics and Computer Science Anhui Normal University

In this paper, we study spherically symmetric Finsler metrics. Analyzing the solution of the projectively flat equation, we construct a new class of projectively flat Finsler metrics.

关键词： projectively flat Finsler metric spherically symmetric

Spherically Symmetric Finsler Metrics with Isotropic E-Curvature

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Journal of Mathematical Research with Applications 2015年第5期35卷 561-567页

作者： Yali CHEN weidong song School of Mathematics and Computer Science Anhui Normal University College of Environmental Science and Engineering Anhui Normal University

In this paper,we obtain a differential equation which characterizes a spherically symmetric Finsler metric with isotropic E-curvature and discuss a particular case using the differential equation we get.

关键词： Finsler metric spherically symmetric E-curvature isotropic E-curvature projectively flat