Taiwanese Junior High School Students’ Understanding about the Validity of Conditional Statements     

Jya-Yi Wu Yu  Erh-Tsung Chin  Chia-Jung Lin 《International Journal of Science and Mathematics Education》2004,2(2):257-285

This research was designed to study Taiwanese junior high school students understanding about the validity of conditional statements. Distinguishing between validity and truth is a crucial topic in mathematical reasoning and argumentation but has been always neglected in the mathematics curriculum at junior high school level of schooling. The aims of the survey were (1) to find out the methods Taiwanese junior high school students used when conducting mathematical justification on conditional statements; (2) to examine whether the students could distinguish between a statement and its converse statement; (3) to analyse whether the correctness of a conditional statement influenced the students to conduct mathematical reasoning and argumentation. Approaching the three aims of the survey is expected to give some insights into the issue of whether the students could distinguish between the validity of conditional statements and the truth of assertions. Several thousand students from different schools which were randomly sampled from within six geographically diverse (regions of Taiwan) were administered a test on either algebra/number-pattern or geometry corresponding to their respective grades. The main results were (1) the methods the students used when conducting mathematical justifications on conditional statements were called producing (supporting- or counter-) example(s), analytical narrative, and analytical formal; (2) over a third of those students, who considered the given conditional statement to be valid or invalid, proposed supporting- or counter-example(s), respectively; (3) over half the students considered the statement and its converse to be the same; (4) students reasoning performance was influenced by their opinions of the correctness of the conditional statements. These results seem to lead to the conclusion that most of these students could not distinguish between the validity of conditional statements and the truth of assertions.  相似文献   

试论康德之道德法则的证成--兼论康德实践哲学的先验特征     

李瑾 《青海师专学报》2002,22(2):39-41

康德哲学之“先验哲学”之名一般指其认识论,本文认为康德实践哲学也具有康德意义上的先验特征,主要体现为道德法则的证成过程中,康德步步追溯,最后达至“理性的事实”这一先验的理由,表现出理论的先验性。  相似文献   

高考考生作答试卷主观感受问卷的编制及其信度、效度检验     

陈畅 《考试研究》2008,(4):91-101

高考考生作答试卷主观感受问卷是命题效度研究中收集资料的重要工具。本文以考生对试题难度、抽样水平的主观感受以及作答时的心理焦虑程度等三个因素为标准编制问卷,并在某市高考考生中进行调查,对调查结果进行验证性因素分析。分析结果表明,该问卷是一个具有较好信度和效度的测量工具,可以为高考命题的效度研究提供一定的依据。  相似文献   

国立科研机构薪酬制度有效性分析   总被引：13，自引：1，他引：13  

赵兰香 《科研管理》2004,25(2):135-139

薪酬制度的有效性直接关系创新效率，有效的薪酬制度需要具有竞争性、公正性和激励性特征。对科研事业单位科研人员薪酬状况的调研结果显示，目前我国的科研事业单位，尚未形成有效的薪酬制度，应引起关注，一些政策应予以调整。  相似文献   

资源型区域协同发展评价研究   总被引：21，自引：0，他引：21  

穆东  杜志平 《中国软科学》2005,(5):106-113

协同发展是区域可持续发展的基础和实现手段，是健康、顺利、快速发展的前提条件，是建设和谐社会的客观要求。资源型区域的协同发展不是即生的，它是通过对原有区域不断诊断、调整、评价，周而复始逐步实现的。本文在对DEA方法进行扩展的基础上，从资源型区域系统的内部和子系统之间，给出“协同”和“发展”的有效程度的评价方法，进而得到区域协同发展的综合评价指标，并提出政策建议。  相似文献   

论物权公信力原则的适用限制     

吴国喆 《科学．经济．社会》2007,25(1):105-109

物权公信力原则是物权变动的基本规则且为善意取得制度的理论基础,其适用受到严格的限制,表见物权和真实物权的背离是公信力原则适用的基本逻辑前提,而能够主张公信力原则保护的,限于基于法律行为而取得物权的善意取得人,表见权利人则并不受其保护。此外,公信力原则只为善意者的利益而存在,不关涉其不利益,且与表见权利本身紧密相关。  相似文献   

青少年个人成长主动性问卷的初步编制与检验          下载免费PDF全文

郭纪昌叶一舵 《宁波大学学报(教育科学版)》2016,(2):15-019

Nine hundred and forty-four effective participants from middle schools are enrolled in this research and divided into two subgroups: sample 1 (N=472) is used in the exploratory factor analysis (EFA), and sample 2 (N=472) in the certified factor analysis (CFA). Results show that an Adolescents’ Personal Growth Initiative Scale contains 24 items in 5 factors, with expected indices of reliability and validity.  相似文献   

An integrative perspective of validating a simplified Chinese version behavioral regulation in exercise questionnaire-2     

Han Chen  Jun Dai  Jiling Liu 《Measurement in physical education and exercise science》2018,22(3):213-223

The study aims to examine psychometric property, measurement invariance, and latent mean difference of a Chinese version instrument of the Behavioral Regulation in Exercise Questionnaire ?2 (C-BREQ-2), which originally includes five constructs. The study also examined the relationship between C-BREQ-2and participants’ weekly moderate to vigorous physical activity (MVPA). Participants were middle and high school students recruited from Shanghai, China. The final sample (N = 437, 49% for boys) was randomly split into two subsamples, where the first subsample (N = 208) was used for exploratory factor analysis (EFA) and the second subsample (N = 229) for confirmatory factor analysis (CFA). Measurement invariance and latent mean difference across gender was examined. Structural equation modeling (SEM) was utilized to explore how different motivation types relate to adolescents’ weekly MVPA. Results showed that the revised 14-item, three-factor model is invariant at both configural, full metric, and full scalar levels across genders. The following latent mean comparison revealed that boys perceived higher introjected regulation than girls. Finally, only introjected regulation significantly and positively related to adolescents’ MVPA.  相似文献   

Kinematic analysis of the standing long jump in children 6- to 12-years-old     

Jorge R. Fernandez-Santos  Jose Luis Gonzalez-Montesinos  Jonatan R Ruiz  David Jiménez-Pavón  Jose Castro-Piñero 《Measurement in physical education and exercise science》2018,22(1):70-78

The purpose of this study was to analyze the kinematic variables that determine the performance of the standing long jump in children 6- to 12-years-old. There were 121 healthy children (58 girls) recorded while they performed the standing long jump test. All kinematic variables showed a significant correlation with calculated jump distance and measured jump distance, except for the knee joint angle at maximum shoulder extension angle, ankle joint angle at maximum shoulder extension angle, and shoulder joint angle at maximum knee flexion angle. Stepwise multiple regression analysis showed that sex, age, and body mass index accounted for 51.1% of the jump distance variance. Among all the kinematic variables, take-off distance and take-off speed were accounted for the most of the variation in the jump distance. Physical education teachers and coaches should consider special attention to these anthropometrics and kinematic aspects in improving the standing long jump performance in children.  相似文献   

基于文本相似度分析的期刊引文有效性识别研究     

鞠秀芳 《现代情报》2018,38(11):14-17

真实性、准确性、直接性与完整性是引用参考文献的首要准则,然而种种研究表明,当前的研究论著中引而不注、过度引用、模糊标注甚至虚假引用等不当引用行为日渐增多,这极大地影响了科学研究领域的学术风气,给读者阅读、期刊审稿及成果评定等工作带来了许多不便。本文利用文本相似度算法建立期刊引文有效性识别方法,试图从海量期刊引文数据中识别出期刊引文的真实有效性。实验表明,本文的期刊引文有效性识别方法在引文有效性方面实现了较好的识别效果,可为虚假引文的识别工作提供可靠的依据,从而为编辑人员发现、修正虚假引用问题提供帮助,彰显科学研究的严谨务实精神。  相似文献