基于组态软件的PLC虚拟控制装置开发

组态软件是面向监控与数据采集的软件平台,通过RS232接口与PLC之间进行通讯,可以监控PLC的输入输出状态。利用组态软件可以开发工业级别的虚拟被控对象,用于PLC的实践教学和科研开发,可以节省大量经费,很好地解决PLC实践教学的问题,提高教学效果和教学质量。     

论语篇连贯的显性和隐性衔接机制

语篇应该具有连贯性,语篇连贯是依靠语篇衔接关系建立起来的。实现语篇连贯的衔接机制有显性和隐性之分,其中显性衔接是实现语篇连贯的主要手段,而隐性衔接则是实现语篇连贯的不可缺少的方式。二者相间使用,相互补充,促成整个语篇连贯的建立。     

解决高校扩招后教学质量问题的若干思考

要解决高校扩招后的教学质量问题，应该采取调整高等教育的层次结构，按照学校定位办校提高认识、统一认识；加强师资队伍建设；增加投入、改善办学硬件条件；深化教学改革、强化教学质量管理完善高等教育法规等对策。     

大型精密仪器设备接地保护装置的设计与安装

着重阐述了大型精密仪器设备接地保护的重要性及有关接地的概念、接地类型、接地电阻的计算公式。以大型精密仪器设备D8-X射线衍射仪接地装置的设计与安装为例，介绍了接地电阻值的理论计算、接地体的设计、敷设与安装、接地电阻值的测量及接地装置的检查与维护方法。     

Color control of the multi-color printing device

INTRODUCTION During the development of printing technology, digital printing has played an important role. Now various kinds of multi-color digital inkjet printers are available. Compared with the conventional digital inkjet printer, the multi-color digital inkjet printer has larger color gamut and can faithfully produce more colors. The conventional color printing devices nor- mally use three or four inks, e.g., CMY, CMYK. Although some adopt more than four inks, e.g., CMYKLcLm, the…     

充分发挥投影仪在数学教学中的作用

本文围绕全面提高教学质量和效率，落实素质教育，从四个方面阐述了投影仪在数学教学中的应用。     

时钟设计问题的探讨

本文探讨了PLD设计过程中4个不同的时钟设计方案,对这些不同方案的优点、缺点和在设计过程中需注意的问题进行了分析,并提出了几个合理的建议.     

智慧校园建设中电子文件单轨制管理实现路径

作为全国首批国家示范性高等职业院校和广东省一流高职院校建设计划立项建设单位之一的广州番禺职业技术学院,伴随着智慧校园的建设,从文档一体化到数据档案一体化,一方面,将档案管理渗透到教学、科研、管理等业务活动中,另一方面,将归档流程写入业务环节,通过更新观念、规则前置、协同治理的方式将档案工作深度融入学校信息化整体进程,并结合自身实践,提出了高校业务系统数据电子化归档的具体思路和实现路径。     

Effect of a distal protection device on epicardial blood flow and myocardial perfusion in primary percutaneous coronary intervention

Objective: The beneficial effect of percutaneous coronary intervention (PCI) in patients with acute myocardial infarction (AMI) has been well established, but there is the problem of no-reflow phenomenon which is an adverse prognostic factor in primary PCI. In the present study the effect of a distal protection device (PercuSurge GuardWire; GW) on epicardial blood flow and myocardial perfusion was evaluated. Methods and Results: Patients with AMI were randomly divided into 2 groups, the GW and the control groups. The GW group included 52 patients with AMI who underwent primary PCI with GW protection and the control group included 60 patients who underwent primary PCI without GW protection. Epicardial blood flow in the infarct-related artery (IRA) and myocardial perfusion were evaluated according to the thrombolysis in myocardial infarction (TIMI) flow grade and the myocardial blush grade (MBG). We found TIMI score of 3 was obtained significantly more frequently in the GW group (96%) than in the control group (80%). The MBG score of 3 was obtained also significantly greater in the GW group (65%) than in the control group (33%). Conclusion: Primary PCI with GW protection can significantly improve epicardial blood flow and myocardial perfusion.     

多功能车刀几何角度测量仪的研制

针对工科院校车刀几何角度测量实验中存在的问题,从教学目标出发分析了车刀几何角度测量仪应具有的目标功能,在此基础上研制了多功能车刀几何角度测量仪,并进行了实验验证。该测量仪具有参考坐标系的建立、车刀几何角度测量和车刀纵横方向进给等多种功能,便于学生对金属切削刀具知识的学习、理解和掌握。