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Microstructures and Hardness of 8CrWMoV Steel with Multiple Types of Ultra Fine Carbides

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材料热处理学报 2004年第5期25卷 279-283页

作者： DAIyu-mei ZHANGZhan-ping MAYong-qing QIyu-hong liuyan-xia yuTao Instituteofmaterialsandtechnology DalianMaritimeUniversityDalian116026

The structure and hardness of 8CrWMoV steel with multiple types of ultra fine carbides are studied after annealing, quenching and tempering in this paper. The results show that multiple types of carbides M3C, M7C3, M23C6, M6C and MC were observed in the annealed steel. Nucleation and coalescence of new carbides, partial dissolution of original carbides in γ phase region during annealing at 800～840℃, result in ultra-fine carbides. Average size of the carbides is0.33～0.34μm in the steel annealed at 800～840℃. Because M3C and M23C6 dissolve easily in austenite, the high hardness HRC63～65 can be obtained by quenching at 840～860℃. Un-dissolved carbides M6C and MC (VC) can effectively prevent the coarsening of austenitic grain, and conduce to obtain very fine martensite. The retained austenite can be easy to decompose during tempering at low and middle temperature due to the precipitation of multiple types of carbides and the good tempering-resistance of the steel is obtained. The microstructure and property of the steel after heat treatment can be accurately explained by calculating based on phase equilibrium *** Words: 8CrWMoV steel, ultra-fine carbide, heat treatment, microstructure,

关键词：显微结构 8CrWMoV钢超细硬质合金硬度热处理

高强度循环训练超重人群身体成分、心肺功能及代谢指标的变化

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中国组织工程研究 2019年第11期23卷 1738-1742页

作者：余宏刘琰李波中国民用航空飞行学院四川省广汉市618307

背景:如何利用科学规律的身体活动来降低肥胖率及避免代谢疾病的发生是长时间以来相关学者研究的重点课题之一。目的:12周高强度循环训练对于超重肥胖男性的身体组成、心肺功能及代谢症候指标的影响。方法:23位中年超重男性随机分配至... 详细信息

背景:如何利用科学规律的身体活动来降低肥胖率及避免代谢疾病的发生是长时间以来相关学者研究的重点课题之一。目的:12周高强度循环训练对于超重肥胖男性的身体组成、心肺功能及代谢症候指标的影响。方法:23位中年超重男性随机分配至高强度循环训练组或控制组。接受3min台阶测验以取得受试者的体力指数。高强度循环训练组进行每周6次,为期12周共72次的高强度循环训练,即最大努力完成12个动作,运动30 s,休息15 s;控制组则维持日常身体活动。运动干预前、后受试者接受各项指标测量。结果与结论:(1)与运动前和控制组比较,运动干预后高强度循环训练组的体脂肪百分比、脂肪量、腰围、臀围、收缩压、舒张压、空腹血糖、血浆三酰甘油、胆固醇、低密度脂蛋白胆固醇均显著下降(P <0.05);体力指数、高密度脂蛋白胆固醇显著上升(P <0.05);(2)结果表明,每周运动时间约60 min,为期12周共72次的高强度循环训练可有效改善中年超重肥胖男性的身体成分、心肺功能、代谢症候指标。

关键词：台阶测验体脂肪百分比腰围血压高强度循环训练超重人群心肺功能代谢指数体脂肪率胆固醇甘油三酯类组织工程

Interconnections between diabetic corneal neuropathy and diabetic retinopathy:diagnostic and therapeutic implications

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Neural Regeneration Research 2025年第8期20卷 2169-2180页

作者： Mingyi yu Faith Teo En Ning Chang liu yu-Chi liu Tissue Engineering and Stem Cell Group Singapore Eye Research InstituteSingapore Yong Loo Lin School of Medicine National University of SingaporeSingapore Department of Cornea and External Eye Disease Singapore National Eye CenterSingapore Ophthalmology and Visual Sciences Academic Clinical Program Duke-NUS Medical SchoolSingapore

Diabetic corneal neuropathy and diabetic retinopathy are ocular complications occurring in the context of diabetes *** corneal neuropathy refers to the progressive damage of corneal *** retinopathy has traditionally been considered as damage to the retinal ***,growing evidence suggests that diabetic retinopathy is a complex neurovascular disorder resulting from dysfunction of the neurovascular unit,which includes both the retinal vascular structures and neural *** retinopathy is one of the leading causes of blindness and is frequently screened for as part of diabetic ocular ***,diabetic corneal neuropathy is commonly overlooked and underdiagnosed,leading to severe ocular surface *** studies have found that these two conditions tend to occur together,and they share similarities in their pathogenesis pathways,being triggered by a status of chronic *** review aims to discuss the interconnection between diabetic corneal neuropathy and diabetic retinopathy,whether diabetic corneal neuropathy precedes diabetic retinopathy,as well as the relation between the stage of diabetic retinopathy and the severity of corneal *** also endeavor to explore the relevance of a corneal screening in diabetic eyes and the possibility of using corneal nerve measurements to monitor the progression of diabetic retinopathy.

关键词： cornea corneal nerves diabetes diabetic corneal neuropathy diabetic retinopathy retina

Problems of Quality of Migrant Workers and Countermeasures from the Perspective of Iceberg Model

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Asian Agricultural Research 2012年第5期4卷 48-50页

作者： yan yu-jie,liu yuan The College of Management,Shaanxi University of Science and Technology,Xi’an 710021,China

From the perspective of Iceberg Model,we analyze levels and structures of quality of migrant workers from knowledge,skills,social role, self-cognition,traits and motives. On the basis of these situations,we put forward countermeasures: value rural education and enhance skill training; make clear occupational planning and set up correct sense of value; assist migrant workers in facing the reality and adjusting their state of mind in working; coordinate interest relationship and call upon social care; rebuild mental world and construct harmonious society.

关键词： Iceberg Model Quality of migrant workers Problems

结直肠癌术后化疗患者应用音乐联合芳香疗法的疗效分析

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中国现代医学杂志 2016年第1期26卷 124-127页

作者：王丽刘雨燕河南省中医院肛肠科河南郑州450002

目的评价音乐联合芳香疗法在结直肠癌术后化疗患者中的疗效。方法将该院2012年1月-2014年12月收治的符合纳入标准的220例直肠癌患者随机分为观察组和对照组,每组110例。观察组患者手术后在常规护理的基础上接受音乐(早晚各1次)和芳香(晚... 详细信息

目的评价音乐联合芳香疗法在结直肠癌术后化疗患者中的疗效。方法将该院2012年1月-2014年12月收治的符合纳入标准的220例直肠癌患者随机分为观察组和对照组,每组110例。观察组患者手术后在常规护理的基础上接受音乐(早晚各1次)和芳香(晚1次)辅助治疗,持续至出院;对照组患者仅接受常规护理。采用视觉模拟评分(VAS)记录患者手术后的1、4及7 d及出院前疼痛情况,焦虑自评量表(SAS)、抑郁自评量表(SDS)和匹兹堡睡眠质量指数(PSQI)评估患者化疗前后情绪及睡眠状况;同时记录各组化疗期间出现恶心呕吐患者例数。结果与对照组相比,观察组患者疼痛、焦虑及抑郁水平明显降低(P<0.05);睡眠质量得到明显改善(P<0.05);同时,恶心呕吐发生率显著降低(P<0.05)。结论音乐联合芳香疗法在结直肠癌术后化疗患者护理中效果显著,值得推广。

关键词：直结肠癌化疗音乐疗法芳香疗法护理

Low-cost and fluoride-free synthesis of MFI zeolite nanosheets with enhanced stability for benzene alkylation with ethanol

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Journal of Energy Chemistry 2025年第1期100卷 458-468页

作者： Peng Zhu Cun liu Yiren yu Guoshu Gao yumeng Zhao Xiongfu Zhang Guodong liu Guohui yang State Key Laboratory of Fine Chemicals School of Chemical Engineering Dalian University of Technology State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences

Zeolite nanosheets with a short b-axis thickness are highly desirable in lots of catalytic reactions due to their reduced diffusion resistance. Nevertheless, conventional synthesis methods usually require expensive structure-directing agents(SDAs), pricey raw materials, and eco-unfriendly fluorine-containing additives. Here, we contributed a cost-effective and fluoride-free synthesis method for synthesizing high-quality MFI zeolite nanosheets through a Silicalite-1(Sil-1) seed suspension and urea cooperative strategy, only with inexpensive colloidal silica as the Si source. Our approach was effective for synthesizing both Sil-1 and aluminum-containing ZSM-5 nanosheets. By optimizing key synthesis parameters,including seed aging time, seed quantity, and urea concentration, we achieved precise control over the crystal face aspect ratio and b-axis thickness. We also revealed a non-classical oriented nanosheet growth mechanism, where Sil-1 seeds induced the formation of quasi-ordered precursor particles, and the(010)crystal planes of these particles facilitated urea adsorption, thereby promoting c-axis-oriented *** obtained ZSM-5 nanosheets exhibited exceptional catalytic performance in the benzene alkylation with ethanol, maintaining stability for over 500 h, which is 5 times longer than traditional ZSM-5 catalysts. Furthermore, large-scale production of ZSM-5 nanosheets was successfully carried out in a 3 L highpressure autoclave, yielding samples consistent with those from laboratory-scale synthesis. This work marks a significant step forward in the sustainable and efficient production of MFI nanosheets using inexpensive and environmentally friendly raw materials, offering the broad applicability in catalysis.

关键词： MFI zeolite ZSM-5 Nanosheets Scale-up synthesis Aromatic alkylation

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面向实时海量数据流的数据聚类

北京邮电大学学报 2016年第3期39卷 114-119页

作者：赵金东于彦伟刘惊雷烟台大学计算机与控制工程学院山东烟台264005

针对海量实时数据流,提出了一种基于密度和网格划分相结合的聚类算法.首先对数据空间进行划分,判断每个单元格中数据点的属性.如果单元格内数据点密度高于阈值,则判定这些点为核心点;否则,根据单元格邻居内数据点的数量对数据点进行再... 详细信息

针对海量实时数据流,提出了一种基于密度和网格划分相结合的聚类算法.首先对数据空间进行划分,判断每个单元格中数据点的属性.如果单元格内数据点密度高于阈值,则判定这些点为核心点;否则,根据单元格邻居内数据点的数量对数据点进行再次判断,以确定单元格内的数据点是边界点还是噪声点.算法克服了基于密度的算法运行效率低的缺点,又弥补了基于网格的算法精度较低的不足.通过实验验证了算法的效率和性能,并与经典的DBSCAN和CLIQUE算法进行了对比分析.最后分析了算法在面向海量实时数据流方面所具有的优势,并提出了进一步的研究方向.

关键词：异常检测聚类分析密度聚类网格聚类海量数据流

基于神经网络和模糊理论的电力系统动态安全评估

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四川大学学报（工程科学版） 2004年第1期36卷 106-110页

作者：严宇刘天琪四川大学电气信息学院四川成都610065

在实用动态安全域的基础上提出了实用动态安全域的神经网络和模糊理论方法,构建了用于拟合动态安全域的ANN拟和器和用模糊理论在安全边界上构造一个模糊中间带的模糊识别器,并对该方法中的系统灵敏度和超平面度进行了分析。最后对4机11... 详细信息

在实用动态安全域的基础上提出了实用动态安全域的神经网络和模糊理论方法,构建了用于拟合动态安全域的ANN拟和器和用模糊理论在安全边界上构造一个模糊中间带的模糊识别器,并对该方法中的系统灵敏度和超平面度进行了分析。最后对4机11节点测试系统进行了仿真计算。实验表明,用神经网络拟合的动态安全域其拟和合度和精度均高于传统最小二乘法的拟合,其模糊识别器进一步减少了临界点的误判和在安全域边界上稳定和非稳定点的误判。

关键词：电力系统动态安全评估动态安全域神经网络模糊理论模糊识别器

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GPU并行加速的边折叠简化算法

计算机工程与设计 2016年第11期37卷 3051-3057页

作者：范豪刘峻孙宇陆向艳刘艳广西大学计算机与电子信息学院广西南宁530004 广西信息科学实验中心广西桂林541004 广西大学广西多媒体通信与网络技术重点实验室培育基地广西南宁530004 国家气象中心北京100081

针对目前串行的网格简化算法速度过慢,忽略模型细节特征的问题,提出一种基于GPU的边折叠网格简化算法。将三角网格模型划分为一系列强独立区域,采用二次误差测度计算边折叠代价,将独立区域内的所有强独立边中的最小折叠代价作为强独立... 详细信息

针对目前串行的网格简化算法速度过慢,忽略模型细节特征的问题,提出一种基于GPU的边折叠网格简化算法。将三角网格模型划分为一系列强独立区域,采用二次误差测度计算边折叠代价,将独立区域内的所有强独立边中的最小折叠代价作为强独立区域排序值,取各个强独立区域中折叠代价最小的边并行地进行折叠操作。实验结果表明,该算法具有较快的简化速率,较好的细节特征保持能力,简化模型具有较好的拓扑连接关系和较小的几何误差。

关键词：网格简化边折叠强独立区域二次误差测度图形处理单元