离心泵性能实验设备综合改造及实践

因原有实验装置使用年限太久、仪器设备老化、技术落后等原因已不能满足实验教学改革和发展的要求,通过对离心泵性能实验设备的综合改造,提高其综合性、操作性、多样性及比较性,实现了手动测量和自动测量的一体化操作设备,实现了单泵测量、双泵串联和双泵并联的多种测量模式。通过几年实践表明,改造后的实验设备满足了实验教学和科研的要求。     

可视化离心泵汽蚀实验装置研制与教学应用

汽蚀对离心泵的性能和寿命影响极大,离心泵汽蚀实验是流体机械类课程的核心内容.该文研制了可视化离心泵汽蚀教学实验装置,采用有机玻璃透明泵盖和半开式叶轮设计加工了被测离心泵,利用频闪仪和高速摄像机实现了对离心泵旋转叶轮内汽蚀过程的全程清晰观测,并开发了实验监测系统.该实验装置能够完成离心泵汽蚀性能曲线测试,且能够拍摄到旋转...     

低氧弥散燃烧实验系统的开发

结合传热学、燃烧学、自动控制原理、热工测量及仪表等专业知识,开发了该低氧弥散燃烧实验系统。实验系统主要由高温烧嘴、蓄热室、四通阀、热工检测及控制系统等组成,该系统可以开出热工、自动控制等多个综合性和研究性实验,形成了创新学科、科研项目与实验教学的互动平台,提高了实验室整体科研条件和学科发展水平。     

离心泵内部流动结构、性能优化与故障检测综述（英文）

目的:对离心泵的内部流动机理和外部特性、振动监测和性能优化进行研究,并对新兴研究趋势进行评述,为提高离心泵系统的能效提供参考建议。创新点:1.探讨了最新的用于离心泵数值模拟的湍流模型和空化模型的研究成果以及利用可视化方法揭示离心泵内部复杂流动现象的最新进展。2.对离心泵的外部特性、空化和振动进行了广泛的讨论,并总结出一种提高离心泵在工程应用中的效率和扬程、降低汽蚀余量的适用性强的离心泵叶轮多目标优化方法。方法:1.对离心泵的内部流动机理进行综述,以充分了解离心泵内部复杂的流场结构和能量损失机理。2.对离心泵外部特性进行研究,解释内部非定常流动与外部特性的耦合关系。3.介绍与离心泵在运行过程中压力脉动的监测和测量相关的最新研究进展。4.详细介绍优化离心泵性能的各种方法和措施。结论:1.尽管对离心泵内部流动现象机理及流场结构的研究已经取得了一定进展,但研究中仍存在一些亟待解决的问题,如初生空化的监测与预防、泵内旋转失速现象发生发展的规律、数值模拟和实验之间不可忽视的数据差异等。2.针对这些问题,开发高精度的计算流体动力学仿真模型,结合关键过流部件的优化设计来减少流动不稳定性和提高性能,以及运用现代流动显示技术的最新设备进行大量的仔细繁杂的试验与测量工作,是非常必要和重要的,也是未来泵内流动研究的趋势。     

过控专业“五位一体”特色实验系统研制与探讨

研制了一套过程装备与控制工程专业"五位一体"特色实验系统。该实验系统由离心泵实验模块、管路特性实验模块、反应器实验模块、换热器实验模块、塔设备实验模块组成。各模块即可独立进行各典型设备运行特性实验,又可以联合建立过程工业整套装置的综合实验。部分模块预留了外接设备接口,可进行创新拓展实验的研究。结果表明:该实验系统极大地改善了的实验条件,为学生的工程实践、综合设计及自主创新等能力的培养提供了有力保障。     

形状误差可视化数据处理系统在教学中的应用

形状误差可视化数据处理系统在教师的指导下,由毕业设计学生参与设计完成,并在互换性与测量技术基础课程的课堂教学和实验教学中得到了很好应用.文章论述了可视化数据处理系统的设计和在毕业设计课堂教学、实验教学中的应用效果.该系统既使毕业生得到了本专业综合能力的锻炼,又极大地改进了课程的课堂和实验教学效果,达到了"一箭三雕"的目的.     

基于DCS的管道输送实验系统设计

针对油气储运工程专业实验教学与科研的需要,设计开发了一套以DCS为核心的管道输送实验系统。该系统技术先进、自动化程度高、组态灵活,可模拟长输管道运行工况,实现从泵到泵、从罐到罐、旁接油罐等多种输送工艺,具有丰富多样的实验功能;并可用于专业实习、课程设计、毕业设计和研究生培养等,同时也为科研工作的开展提供了便利条件。     

铜电解精炼综合实验台的研制

研制了铜电解精炼综合实验台.该实验台由电解整流系统、电解液热交换系统及电解温度控制系统等组成.可开设5个与铜冶金相关的本科专业实验,且能改进扩充为电解、电积实验装置.该综合实验台具有可控性强、安全性高、实验数据准确及一机多用等特点,有效改善了冶金学科本科生专业的实验条件.     

中央空调综合测试系统

简述了中央空调综合测试系统的设备及系统组成,详细介绍了该实验系统的功能。该实验系统是为我校建筑环境与设备工程专业本科生和研究生搭建的空气处理综合试验平台,该实验系统技术先进,可以在实验系统上开设多个实验,为学科发展奠定了坚实的基础。     

一种航空摄影测量模拟系统的设计与实现

介绍了一种航空摄影测量模拟系统的设计思想和制作过程,该实验系统能够模拟真实的航空摄影测量工作全过程。模拟系统各个环节的设计是按照外业摄影测量的相关规范要求进行的。该系统能够根据实际需要来调整摄影航线之间的距离,在航向和旁向上实现不同重叠度的航空像片的摄影。模拟系统与专门设计的多要素地形、地物模型及数据处理中心集成在一起,为遥感、摄影测量和工程测量方向的研究人员提供了实用的科研设备,同时还满足了测绘工程、遥感科学与技术等相关专业课程和实验教学的需要。系统的建立解决了长期以来高校在摄影测量与遥感教学过程中实验设备相对落后的现状,节约了该领域科学研究的实验成本,丰富了测绘科学与技术学科的教学和实验手段。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.