“金属材料焊接”课堂改革与创新实践

金属材料焊接课程是焊接技术与自动化专业的专业核心课程之一,该文以现代学徒制试点专业建设为契机进行了课程改革,提出以就业为导向的"三引入"教学内容改革、"三联系"的教学方法与教学手段改革以及突出"四个结合"、树立开放的教育教学观。课程改革效果显著,培养了一支优秀的教学团队。     

电阻点焊微机控制系统的研制

本文设计中以8031最小系统为系统的控制核心对电路进行控制。电路中包含有7279显示电路、键盘电路、控制电路等电路,能实现对焊接的四个过程（预压、焊接、保持、停止）的时间、设定和运行,电路中有过零保护功能,并且当焊接温度高于设置的温度时温度采集电路会把温度传输给单片机,当温度高于预设温度时,单片机会发出信号使焊接电路停止运行并进行报警,达到对焊接的控制,设计的多点温度采集系统上位机程序虽结构简单但实用性强,且具有较强的抗干扰能力,基本上实现了电阻点焊的要求,可靠性高。本系统经过初步运行、调试,性能良好,具有应用和推广价值。     

焊管机组焊缝温度的测量与控制

本文根据两个波长下辐射能量的比值是随温度变化这一规律,研制出红外双色单通道温测控温系统,安装在60焊管机组上使用,确保焊缝始终处于最佳焊接温度,以提高焊管质量。     

Motor coordination difficulties in 5–6‐year‐old children with severe behavioural and emotional problems

Incidence, severity and types of motor difficulties in children with severe behavioural and emotional problems were evaluated. A group of 6‐year‐olds (n = 29) with such problems and controls (n = 29) were compared on the Movement Assessment Battery for Children (M‐ABC). The groups were compared on total scores as well as manual dexterity, ball skills and balance. Individual M‐ABC profiles were compared with Teacher's Report Form profiles. It was found that 62.1% in the high‐risk group and 20.7% in the control group showed motor coordination difficulties. In the high‐risk group 55.2% fulfilled the criteria of the DSM‐IV for developmental coordination disorder, compared to 3.4% controls. The high‐risk group showed significant difficulties within all sub‐areas of the M‐ABC. There was a significant relationship between attention problems and manual dexterity difficulties. The combination of problems identified makes these children vulnerable with regard to school inclusion and in need of proper assessment and intervention.     

Surface treatment of 0Cr19Ni9 stainless steel SMAW joint by plasma melting

Micro-plasma arc surface melting of 0Cr19Ni9 shielded metal arc welding joint with a micro-plasma arc welder produced a thin surface melted layer with a refined microstructure. The surface treatment changed the anodic polarization behavior in 0.5 mol/L H2SO4 solution. The polarization tests showed that for the as-welded joint both the heat-affected zone and the weld metal decreased in resistance to corrosion compared with the as-Received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.     

图书馆协会管理什么——解读美国图书馆协会工作手册

对《美国图书馆协会工作手册》进行了解读,介绍了该《手册》的要点,以及美国图书馆协会管理的策略与措施,论述在行业管理方面该手册可借鉴之处。     

《标点符号用法》的不足

标点符号是现代书面语中不可缺少的衔接和连贯标志。在没有多少形态变化的汉语里．在没有实行分词连写的汉语书面中,标点符号使用的规范尤其重要。文章根据标点符号的实际使用情况．探讨了《标点符号用法》的指导作用,并指出了《标点符号用法》的不足,为将来进一步修订和完善《标点符号用法》提供参考。     

人工挖孔灌注桩水下施工工艺

人工挖孔桩具有施工进度快、设备简单、噪音少、震动小,成桩质量容易保证等优点。本文介绍了人工挖孔灌注桩的水下施工工艺,并对施工过程中应注意的问题进行了较为具体的阐述。     

一种新型的机器人分拣工件控制装置的设计

在日常生活中经常需要对货物进行分类、处理,分拣已广泛应用到服装、图书、食品与医药等行业中。本文分析了人工分拣成本高、效率低、人的体力消耗大等因素限制的缺点,设计了一种新型的机器人分拣工件控制装置,将计算机、视觉识别器、行走装置、分拣装置、驱动器、摄像机等工具连接在一起,采用此分拣工件控制装置分拣安全、高效、准确。     

基于分组法的《焊接检验》课程教学方法改革研究

本文在分析《焊接检验》课程课堂教学存在问题的基础上,提出了基于分组法的《焊接检验》课程教学方法改革措施。教学方法改革主要包括以下几个方面：分组讨论法、学生模仿授课法、主动回答问题奖励法、科研反哺教学法、联合撰写学术论文法。给出了每种教学方法改革的实施思路和具体方案,介绍了其实施成效。应用与实践效果表明基于分组法的《焊接检验》课程课堂教学方法改革取得了较好的成效,可为其它课程的课堂教学方法改革提供有益的参考。