语音数字万用表的单片机实现

万用表是一种常见的测量工具,采用凌阳SPCE061A单片机设计的语音数字万用表,具有语音发声功能,测量精确、使用方便、性能可靠;在硬件设计上以普通数字万用表的结构为基础,加入单片微机,设计了自动语音播放单元;在软件设计上采用了树形模块化结构,流程清晰,操作性强;该万用表可以完成基本电气量的测量和常见电气元件检测等各项功能,体现了直观、实用、人性化的特点,提高了仪表的智能化程度。     

智能数字万用表研制

现有的数字万用表存在测量时间长、自动化水平低、操作不便等问题.针对这些问题,提出了自动测试的设计方法,介绍了自动测试系统的软件和硬件组成,阐述了自动测试系统完成测试的过程,并据此研制了一种新型智能数字万用表.该表能够自动识别电压、电流、电阻等被测物理量并进行自动测量,其测量精度符合国家标准,并具有测量时间短、数据准确、自动化程度高、实用性强、可靠性高、体积小等优点,是现代化的智能仪器.与传统数字万用表相比,提高了测试效率和测试结果的准确性,避免了人为因素的影响,保证了测试精度.该表造价低、使用方便,具有广泛的应用前景.     

数字万用表自动关机电路的原理及故障分析

数字万用表作为实验教学中的常用仪器,在使用中经常会出现各种故障,作好仪器设备的维修工作是实验教学顺利进行的根本保证。自动关机功能已在多种数字万用表中应用,它可避免因忘记关电源而空耗电池。现以实验教学中所用的DT9205数字万用表的自动关机电路予以分析。     

数字万用表的设计性实验研究

大学物理实验室为学生提供基本的电学元件与相应的组装器材,学生在掌握数字万用表的理论基础知识之后,自己设计实验方案和实验电路图,制作多量程数字万用表,自己设计实验激发了学生学习的主动性,拓展了学生的思维能力,培养了学生的创新能力。     

电工电子实践测量中数字万用表的巧用

在电工电子实践测量中如能巧妙的利用数字万用表的现有功能,掌握一些测量技巧,就能克服数字万用表现有功能的局限性,扩大其测量功能。     

用数字万用表测低值电阻

阐述用数字万用表测低值电阻的原理及方法,并通过实验说明准确性.     

台式4 位数字万用表故障分析方法

介绍了LED显示的台式4位数字万用表的原理、故障分析和维修方法。     

Metrical stress sensitivity in young children and its relationship to phonological awareness and reading

This paper reports two studies of young English‐speaking children's ability to cope with changes to the metrical stress pattern of spoken words and the relationship between this ability, phonological awareness and early reading development. Initially, 39 children aged 4 and 5 years were assessed on their ability to identify mispronounced words, including words that had their metrical stress pattern reversed. The children were significantly worse at identifying words that had their metrical stress pattern reversed than words that were mispronounced in other ways. The second study was a cross‐sectional comparison of 31 5, 6 and 7‐year‐old children's performance on the metrical stress reversal condition of the mispronunciation task. Measures of the children's written language skills and phonological awareness were also taken. The 7‐year‐old children outperformed the 5‐year‐olds on the metrical stress task. Performance on this measure was associated with most of the measures of phonological awareness and literacy, and was associated with rhyme awareness and spelling ability after age had been taken into account. Moreover, metrical stress sensitivity could account for variance in spelling ability after phonological awareness had been taken into account, and after vocabulary had been taken into account. This suggests that stress sensitivity may influence spelling development in a way that is independent of its contribution to phonological representations.     

“读图时代”与受众的读图心理探究

图像的传播更纪实、更便捷,大众传播媒介的广泛参与使之变得更加“受众化”。探究什么是“读图时代”以及“受众”的读图心理,对传播媒体的发展具有重要意义。     

语文阅读教学新探

语文学科教育对学生阅读行为的要求远高于其他学科，它要经历认读、辨析、提取、概括、类属化等一系列的活动。在阅读教学中要引导学生进行创新阅读，不断提高学生的阅读水平。     

Contextual effects on predicting risk for reading difficulties in first and second grade

This study utilized early reading assessment data from a randomized trial of 210 urban and rural schools in Texas to examine contextual effects on risk prediction in first and second grade. The primary objective was to examine the roles of (a) individual differences, (b) the grade 1 classroom, and (c) the pairing of first and second grade teachers in determining grade 2 outcomes in word reading and fluency. A second objective was to investigate whether the administration format of the assessment (paper, paper plus desktop, handheld plus desktop) or the level of teacher support (web mentoring, no mentoring) moderated the prediction. These moderator variables proved not to be significant. Subsequent analyses found that a combination of student pretest and mean of pretest classroom was a better predictor than student pretest alone. Additionally, the effect of student scores varied by teacher-pair. On average, intraclass correlations (ICCs) ranged from 6% to 17%. Differences in ICCs at the classroom level were much greater than at the school level, and differences in urban schools were twice that of rural schools.     

航管仿真系统中语音技术的应用

分析了在航管雷达模拟系统增加语音识别和合成功能的实现过程。根据航管雷达模拟系统的特点,采用中英文皆可识别且适合连续识别的语音引擎,以及符合人类语言特点的TTS语音库,与系统内部通讯机制相结合,实现语音识别和合成的过程。该系统运行稳定,在识别率和数据传输速度等方面效果比较好。     

阅读课教学与跨文化交际

外语阅读课中的跨化交际是为了跨越不同民族、不同国家的语言及其化的差异,更好地进行思想交流。学习、了解不同化背景及其异同,是避免语用失误、提高化素养的关键。在阅读课教学中,进行化异同的比较研究是加强阅读教学、提高语言运用能力的重要方面。     

个人话语与时代话语的消长——论曹禺的创作道路

曹禺的创作起点很高,逐渐下滑,由一代天才变为平凡的剧作家,这是学术界的共识。其变化原因是什么?从曹禺剧作的内在因素———个人话语与时代话语的消长进行探索,应可提供一种合理的解答。     

无线移动数字图书馆系统中多媒体检索的同步模式

1IntroductionRecent advances in wireless communication,digitallibrary,distributed multi media,massive storage,andmobile computing technologies are sti mulating the de-velopment of mobile multi media digital library systems(M2DLS)that allow mobile clients to access multi me-dia material anywhere and anyti me over a cellular ra-dio network[1,2].In M2DLS,multi media objects,ingeneral,can be composed of multiple media streamssuch as audio and video,whose retrieval must proceedso as to not only …     

The relevance of a connectionist model of reading for “The great debate”

Connectionist models of reading, in particular Seidenberg and McClelland's (1989) parallel distributed processing model of word recognition, are described and contrasted with the top-down, bottom-up, and interactive models of reading from the traditional, symbol-manipulation paradigm of information processing. Connectionism emphasizes: (1) a single, rather than dual, mechanism for processing words, and (2) distributed representations and weighted connections between units rather than symbolic rules for mapping letters and sounds. Implications for the teaching of reading are discussed.     

Phonological processes as predictors of specific reading skills in children at risk for reading failure

Children at risk for reading disability were evaluated as kindergartners and again as first graders to determine (1) intercorrelations among phonological processing tasks and (2) the relationship of such tasks to word identification and word attack. With IQ controlled, there were no intercorrelations among measures of phonological awareness, phonetic recoding in working memory, and phonological recoding in lexical access. Thus, these results failed to substantiate the concept of a general phonological processing ability. Partial correlations controlling for IQ revealed no relationship between reading and phonological awareness or phonetic recoding in working memory. In contrast, lexical access measures were significantly, albeit moderately, correlated with word identification but not word attack. Word attack and word identification were predicted by different combinations of variables. These results suggest that lexical access ability is an important factor in reading acquisition and that different combinations of phonological processes may be related to different aspects of reading.This research was supported by PHS grant HD 21887 to Bowman Gray School of Medicine and by PHS Grant NS 19413 to UNC-Greensboro Subcontract to Bowman Gray School of Medicine.