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王超 《湖北第二师范学院学报》2011,(2):115-116
医用伽玛刀外罩对外形的美观要求非常高,所以我们在生产过程中,对设计的过程以及玻璃钢外罩与设计外形的尺寸保证要求非常严格,这就要求我们对整个设计过程要有一定的认识,以完成整个设计方案。 相似文献
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医用伽玛刀外罩对外形的美观要求非常高,所以我们在生产过程中,对设计的过程以及玻璃钢外罩与设计外形的尺寸保证要求非常严格,这就要求我们对整个设计过程要有一定的认识,以完成整个设计方案。 相似文献
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工业产品的发展及其参与市场的竞争离不开美学设计。科学技术的发展和人们审美观念的变化,使技术与美学的结合成为时代的特征,美观实用的外形已成为产品竞争的重要手段。许多国内、国际知名企业都把工业设计作为自己的第二核心技术,工业产品美学设计也是重要的生产力。 相似文献
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唐士娟 《济南职业学院学报》2009,(6):108-109,112
近年来,研制开发出性能优良的KYN-40.5,成为了各大电力设备厂家的生存资本和利润方向。鉴于组装柜具有外形美观,手车与柜体的配合精度高等优点,设计者们都将组装柜作为其设计方向。为满足各项环境、功能要求,依据GB3906等标准,提出了组装式开关柜的设计方案与装配技术。 相似文献
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樊秋林 《石家庄铁路职业技术学院学报》2018,(1)
云桂铁路南盘江特大桥为世界最大跨度的客货共线铁路上承式劲性骨架钢筋混凝土拱桥,在设计、施工等方面的难度均前所未有。工程施工前,结合结构受力、便于施工、外形美观等多项因素,针对初步设计方案进行了6个方面的比选及优化,取得了最佳设计方案,简化了施工难度,对后续类似拱桥的设计及施工具有宝贵的借鉴价值。 相似文献
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《黄冈职业技术学院学报》2016,(5):101-102
公共垃圾箱是一种公共设施,用于盛放废弃物和垃圾。人们对生活品质的追求越来越来高,公共环境卫生不可忽视。针对现有的公共垃圾箱内外箱分离困难、容易污染、外观单一等问题,通过市场调研,设计一款结构简单、外形美观、方便清理的新型公共垃圾箱。 相似文献
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计算机是教学多媒体的重要组成部分,目前所有教学多媒体所采用的计算机都是市面上的通用微型计算机,这种通用微型机用在教学多媒体设备中造成整个系统有三个缺点:一是所需的外围设备多、占用空间大;二是需要另外再配备专门的机箱或桌(台);三是耗电量大,不符合低碳环保要求。因此,设计开发一种接口丰富合理、机箱可兼做讲桌(同时也兼作操作台)的教学多媒体专用计算机显得非常必要,而开发教学多媒体专用计算机,机箱的设计尤为必要。 相似文献
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《实验室研究与探索》2015,(12):110-113
针对一种PU在线振摇机设计了基于PLC的气缸驱动的电气控制系统。首先介绍了振摇机的基本机械结构以及它的工作流程和原理,然后根据振摇机的工作原理与工艺过程,完成了系统的硬件配置与软件设计,包括控制电路的分析、PLC的机型选择、I/O地址分配及接线、PLC程序设计。系统实现了全自动、急停、复位等功能,具有操作简单、可靠性高、抗干扰能力强、稳定和维护方便等优点。其次,系统基于MCGS嵌入版组态软件,设计了MCGS触摸屏作为人机交互界面,使其与PLC进行通讯,获取实时监控数据,同时加入了系统手动调试界面,为系统的调试带来了很大的方便。该系统经过一个月的现场运行测试,表明本系统稳定,可靠,能够满足现有的30瓶/次的在线实时振摇。 相似文献
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M—BUS（MeterBus）仪表总线是一种低成本的户用电子系统,可以实现公共事业表的联网和远程抄表功能。公共事业表包括户用电表、水表、热量表等计量仪表。本文讨论仪表总线M—BUS和TTL（Transistor—Transistor Logic）电平之间的接口电路的设计,论述了其通信中的发送和接收机制,并提出了硬件上的设计方案。所设计的接口电路传输距离远、带负载能力强、可靠性高、抗干扰能力强。 相似文献
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Joyce Hwee Ling Koh Ching Sing Chai Huang-Yao Hong Chin-Chung Tsai 《Asia-Pacific Journal of Teacher Education》2015,43(5):378-391
This study investigates 201 Singaporean teachers’ perceptions of their technological pedagogical content knowledge (TPACK), lesson design practices, and design dispositions through a survey instrument. Investigation of these constructs reveal important variables influencing teachers’ perceptions of TPACK which have not yet been explored. The confirmatory factor analysis and reliability analysis confirm the validity and reliability of the instrument. The structural equation model shows that the teachers’ perceptions of design dispositions (orientations towards design) and lesson design practices (approaches used for lesson design) have direct relationships with the teachers’ perceptions of TPACK. The results of this study show that to enhance teachers’ TPACK perceptions, teacher educators need to help teachers develop lesson design practices that support ideation and iteration. They also need to develop teachers’ design dispositions that are amenable to exploring and resolving conflicting lesson design ideas. Going beyond TPACK, understandings of teachers’ lesson design practices and design dispositions are important for teacher educators to better design professional development for integration of information and communications technology. 相似文献
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学习机电专业的课程需要各种类型的机电一体化的实验装置。自动翻包机实验系统以邮包进行自动分拣时需要进行的自动翻转为设计背景,很好地综合了机械、电子、计算机等多学科的知识。该文对如何进行该实验系统的机构设计、接口设计、控制系统的软硬件设计及系统的运行调试进行了全面的表述。 相似文献
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With growing interest in the role of teachers as the key mediators between educational policies and outcomes, the importance of developing good measures of classroom processes has become increasingly apparent. Yet, collecting reliable and valid information about a construct as complex as instruction poses important conceptual and technical challenges. This article summarizes the results of two studies that investigated the properties of measures of instruction based on a teacher‐generated instrument (the Scoop Notebook) that combines features of portfolios and self‐report. Classroom artifacts and teacher reflections were collected from samples of middle school science classrooms and rated along 10 dimensions of science instruction derived from the National Science Education Standards; ratings based on direct classroom observations were used as comparison. The results suggest that instruments that combine artifacts and self‐reports hold promise for measuring science instruction with reliability similar to, and sizeable correlations with, measures based on classroom observation. We discuss the implications and lessons learned from this work for the conceptualization, design, and use of artifact‐based instruments for measuring instructional practice in different contexts and for different purposes. Artifact‐based instruments may illuminate features of instruction not apparent even through direct classroom observation; moreover, the process of structured collection and reflection on artifacts may have value for professional development. However, their potential value and applicability on a larger scale depends on careful consideration of the match between the instrument and the model of instruction, the intended uses of the measures, and the aspects of classroom practice most amenable to reliable scoring through artifacts. We outline a research agenda for addressing unresolved questions and advancing theoretical and practical knowledge around the measurement of instructional practice. © 2011 Wiley Periodicals, Inc. J Res Sci Teach 49: 38–67, 2012 相似文献
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罗英军 《十堰职业技术学院学报》2004,17(2):78-79
PROTEL软件在国内的应用已相当普遍,然而不少设计者对PROTEL软件为适应器件特性的变化所做的改进并未重视,这不仅使得软件资源浪费较为严重,新器件的优异性能也难以发挥。本文针对这些改进介绍PROTEL软件在高频电路布线时的一些技巧。 相似文献
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石振国 《南通职业大学学报》2000,14(3):31-36
本第一个分别利用ASP、PHP,JSP这三个动态网站技术,采用统一的API接口,使用同一个数据库安案例,给出了电子商务网站设计的主要步骤和方法：其核心便是构造操作网络数据库的运行平台和运行环境,其难点便是操纵商务数据流的三种语言代码的编写,至于“登录密码验证”,“网站安全”,“数据库加密”等论题将在其他中给出。 相似文献
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Jenifer O. Corn 《Educational technology research and development : ETR & D》2010,58(4):353-376
Schools and districts should use a well-designed needs assessment to inform important decisions about a range of technology
program areas. Presently, there is a lack of valid and reliable instruments available and accessible to schools to effectively
assess their educational needs to better design and evaluate their projects and initiatives. The School Technology Needs Assessment
(STNA) is a free, user-friendly online survey tool that meets this need for planning and formative evaluation of technology
projects in educational settings. This study used existing data from a robust sample (n = 1918) of educators from across North Carolina to examine the reliability and validity of STNA. A collective review of study
results including the literature review, exploratory factor analysis (EFA), confirmatory factor analysis (CFA), and internal
consistently reliability analysis indicated that STNA was a high-quality instrument. 相似文献
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In this article the authors describe the development of an instrument to measure change in teachers’ beliefs about how children acquire early literacy skills and how these skills should be taught. The questionnaire was originally designed for use in the evaluation of affective outcomes for teachers from literacy inservice training and development programmes. The content of the questionnaire has also proved to be of value as a focus for discussion in school staff meetings. Information is provided here on the design, development, validity and reliability of the instrument. The authors invite comment and feedback from researchers who may use the scale. The instrument may be particularly useful in countries where teachers’ beliefs and practices have been influenced to varying degrees by the ‘whole language’ versus ‘skills-based instruction’ debate. 相似文献
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高凤友 《天津工程师范学院学报》2004,14(2):20-22
讨论了现代电子仪器设计中元器件的优化选择问题。详细介绍了采用加权综合法实现元器件优选的原则、标准及评估方法。针对高可靠性电子仪器设计中的元器件选择问题,给出了基于加权综合法的极值法。 相似文献