从概念范畴角度解析概念结构的普遍性特征     

宁岩 《洛阳师范学院学报》2011,30(7):68-70

杰肯道夫依据乔姆斯基的语法生成性的基本思想创立了一套完整的概念语义学,该学说由本体概念范畴和概念结构构成,句法结构由概念结构按一些规则投射而成。国内外语言学界积极地对概念语义学进行分析及引介,但缺少对作为概念语义学核心的概念结构的本质研究。从概念范畴的来源和组成成分两个方面对概念结构进行分析,进而揭示概念结构具有普遍性本质特征。  相似文献   

数字电度表的设计与制作     

郭慧芳 《大众科技》2011,(10):153-155

这是一款基于单片机的数字电度表,主要由显示模块、CPU模块、cs5460A电能表芯片模块和前端电路调理模块部分组成。前端电路调理模块采用2mA／2mA的电流互感器和5A／2．5mA电流互感器和精密电阻实现对市电的转换,并采用RC滤波网络滤波,然后采用由美国CRYSTAL公司的新型电能计量芯片cs5460芯片实现对电能的测量与转换;显示模块用LCD1602,并利用STC89C52组成的CPU模块控制所有芯片的工作、测量、计算电能,送往显示模块进行显示。  相似文献   

基于波前像差的人眼视网膜像调制度和对比敏感度测定     

王伟 《济宁师范专科学校学报》2010,(6):15-17

提出了一种计算复色光下人眼视网膜空间像调制度AIM的方法.利用Hartmann-Shack波前传感器测量的波前像差数据,求得眼睛光学系统的调制传递函数MTF,利用CSV-1000测试仪和VAF-1000视力仪分别测量同一只眼睛的对比敏感度函数CSF以及视力VA,由MTF,CSF,以及VA之间的关联获得复色光下人眼视网膜空间像调制度AIM曲线.结果表明：视网膜AIM曲线与眼光学系统的MTF无关,并且正常人眼（无视网膜疾病）的AIM值相近,因此多眼AIM曲线的统计平均值可以作为标准.文中演示了基于波前技术和标准AIM曲线的对比敏感度CSF的测定,它具有快速和客观测量的特点.  相似文献   

基于英飞凌的CAN总线数据采集网络节点的设计     

李松  胡玉兰 《大众科技》2008,(7):35-37

文章提出了一种基于英飞凌微控制器XC164CS的CAN总线分布式智能测控节点的设计,给出了系统硬件框图、软件流程图、电路原理图,所设计节点实现方法简单,外扩器件少,结构合理,可靠性高,且节点扩展方便,已用于某工业现场,波特率为10Kbps。  相似文献   

A systematic literature review of K-12 environmental Citizen Science (CS) initiatives: Unveiling the CS pedagogical and participatory aspects contributing to students’ environmental citizenship     

《Educational Research Review》2023

Environmental Citizen Science (CS) initiatives have been largely embraced in K-12 education, as they are often hypothesized to improve students' knowledge, skills, attitudes, and behaviours to act as “environmental citizens” according to the notion of Environmental Citizenship (EC). However, the potential of environmental CS initiatives to promote Education for Environmental Citizenship (EEC) has not been systematically explored. At the same time, environmental CS initiatives for educational purposes are highly heterogenous and learning is enacted in diverse ways, according to the participatory and the pedagogical components underpinning each initiative. To address the complexity of the field, this review study adopts the PRISMA methodology to synthesize thirty-four empirical studies (n = 34) retrieved from a systematic review of the literature covering the last two decades (2000–2020). The reviewed environmental CS initiatives were subjected to a content analysis to identify their impact on students' EC (e.g., EC competences, actions, outcomes), as well as to unveil the CS initiatives' constitutional components in terms of (a) Participation (e.g., types of students' contributions, level of data collection, frequency of students' participation, modes of student engagement, forms of students’ involvement), and (b) Pedagogy (e.g., learning goals, educational contexts, learning mechanisms, EEC pedagogy). Our analysis shed light to the three territories (Participation, Pedagogy, Environmental Citizenship) underpinning the reviewed CS initiatives as well as to their interrelations. We reflect on these findings, and we provide directions for future research to guide the development of more successful environmental CS initiatives in K-12 education, serving as a vehicle for EC.  相似文献