共查询到19条相似文献，搜索用时 140 毫秒
1.
测量不确定度是对测量结果质量和水平的科学表达,其通用计量名词术语是国际之间、学科之间联系和交往的共同语言。文章从高职人才培养目标及高职的教学现状角度出发,论述了在高职教学中开展不确定度评定教学的必要性和紧迫性,并就如何开展不确定度评定教学提出一些建议。 相似文献
2.
对脉冲惰性气体保护红外吸收法测定钛合金中氧含量的检测结果进行了不确定度评定,采用A类不确定度对称量过程、仪器示值和标准物质的不确定度进行评定,采用B类不确定度对连续测量和建立工作曲线引入的不确定度进行评定,对样品检测过程的不确定度分量进行分析,重点讨论了称量不确定度和线性拟合引入的不确定度进行量化评定,计算了钛合金样品中氧含量的标准不确定度和扩展不确定度,在本试验中,线性拟合过程和标准物质不确定度分量是不确定度的主要来源,对此提出了减小测量不确定度的方法. 相似文献
3.
评定了按照GB/T601-2002方法配制和标定硫代硫酸钠标准溶液浓度的不确定度。主要从实验方法、建立数学模型、确定不确定度的来源、计算相对不确定度分量、合成不确定度、扩展不确定度等入手,介绍了硫代硫酸钠标准溶液的不确定度评定过程。 相似文献
4.
5.
给出了大学物理实验中量的A类分量不确定度、B类分量不确定度、合成标准不确定度的表示方法,并用两个实例讨论了标准不确定度的评定问题。 相似文献
6.
标准溶液稀释不确定度评定 总被引：2，自引：0，他引：2
依据测量不确定度评定与表示的理论,以砷标准溶液为例,对标准溶液稀释的不确定度进行了评定。通过识别稀释过程中的不确定度来源,分析了各个分量的产生,计算了合成标准不确定度。结果表明,移液器的不确定度是影响标准溶液稀释最主要的因素。 相似文献
7.
主要讨论了大学物理实验误差和不确定度的关系以及直接测量不确定度的评估,最后对单次测量的不确定度评估以及不确定度计算过程中数据修约问题进行了讨论。 相似文献
8.
9.
唐重任 《安徽科技学院学报》2008,22(5)
本文以二苯碳酰二肼分光光度法测定水中六价铬为例,阐述校准曲线法不确定度评定与表示的理论,分析了不确定度的主要来源,评定了不确定度分量及总不确定度,为使用校准曲线法这一类型的不确定度分析和计算提供参考. 相似文献
10.
直读光谱仪测量不锈钢中镍含量的不确定度评定 总被引：1，自引：0，他引：1
曾勤 《Journal of Zhangzhou Technical Institute》2011,13(1)
通过对直读谱仪测量不锈钢中镍含量不确定度的评定,分析了不确定度分量的主要来源,对各不确定度分量进行了评定. 相似文献
11.
用数量词进行精确的表达是人类对社会认识的一大进步,但随着社会的发展有的数量词的起始意义(primary meaning)出现了分化现象引申出新的意义,在一些成语,谚语,诗歌和其它的文学作品中它们已经难于反映原始的确切数量含义了。也就是说数词在语言运用中具有多功能：一方面,它们可表示纯数目,具有精确性的特点;另一方面又可言其“多”,具有不确定的特点;在一些文学作品中正是数词的不确定性或气势磅礴,或意犹未尽,使作品充满情趣。 相似文献
12.
罗颖 《赣南师范学院学报》2011,32(6):92-95
分析一元线性回归系数的相关性,导出一元线性回归系数比值不确定度的计算公式,指出了某些文献中有关回归系数比值不确定度评定存在的问题. 相似文献
13.
Paul Oslington 《Distance Education》2004,25(2):233-242
Uncertainty and irreversibility are central to online learning projects, but have been neglected in the existing educational cost-benefit analysis literature. This paper builds some simple illustrative models of the impact of irreversibility and uncertainty, and shows how different types of cost and demand uncertainty can have substantial impacts on investment decisions. The techniques used are drawn from the financial option pricing literature. In some situations uncertainty should lead decision makers to delay projects which would be accepted under the usual rule "invest if the net present value (NPV) is positive," and in other situations it suggests that projects with negative NPVs should be undertaken. The application of one of these models will then be illustrated in relation to a new online course: the Master of Educational Technology offered by the University of British Columbia. 相似文献
14.
陈燕 《四川教育学院学报》2007,23(1):69-71
情态(modality)表示语言使用者本人对某事物认识的估量和不确定性。会话者可以使用情态功能表达能力,强制、愿望、主张、意图、职责、允许、可能性、意愿和不确定性。文章以Halliday的功能语法根据来对比分析英汉表达情态方法的异同,加深对情态的理解。 相似文献
15.
Michelle D. Lazarus Amany Gouda-Vossos Angela Ziebell Gabrielle Brand 《Anatomical sciences education》2023,16(1):128-147
Uncertainty tolerance, individuals' perceptions/responses to uncertain stimuli, is increasingly recognized as critical to effective healthcare practice. While the Covid-19 pandemic generated collective uncertainty, healthcare-related uncertainty is omnipresent. Correspondingly, there is increasing focus on uncertainty tolerance as a health professional graduate “competency,” and a concomitant interest in identifying pedagogy fostering learners' uncertainty tolerance. Despite these calls, practical guidelines for educators are lacking. There is some initial evidence that anatomy education can foster medical students' uncertainty tolerance (e.g., anatomical variation and dissection novelty), however, there remains a knowledge gap regarding robust curriculum-wide uncertainty tolerance teaching strategies. Drawing upon humanities, arts and social sciences (HASS) educators' established uncertainty tolerance pedagogies, this study sought to learn from HASS academics' experiences with, and teaching practices related to, uncertainty pedagogy using a qualitative, exploratory study design. Framework analysis was undertaken using an abductive approach, wherein researchers oscillate between inductive and deductive coding (comparing to the uncertainty tolerance conceptual model). During this analysis, the authors analyzed ~386 min of data from purposively sampled HASS academics' (n = 14) discussions to address the following research questions: (1) What teaching practices do HASS academics' perceive as impacting learners' uncertainty tolerance, and (2) How do HASS academics execute these teaching practices? The results extend current understanding of the moderating effects of education on uncertainty tolerance and supports prior findings that the anatomy learning environment is ripe for supporting learner uncertainty tolerance development. This study adds to growing literature on the powerful moderating effect education has on uncertainty tolerance and proposes translation of HASS uncertainty tolerance teaching practices to enhance anatomy education. 相似文献
16.
苏梽芳 《华侨大学学报(哲学社会科学版)》2010,(2):41-48
基于中国1983.01-2009.02月度CPI数据,应用多种非对称GARCH模型与信息冲击曲线研究通货膨胀冲击的非对称特征,并检验1996年货币供应量中介目标的引入是否明显降低了通货膨胀不确定性的长期成分。结果发现,通货膨胀冲击存在非对称特征,由通货膨胀冲击引发的通货膨胀不确定性高于同等程度通货紧缩冲击引发的通货膨胀不确定性;而1996年中央银行开始实行的货币供应量作为货币政策中介目标的适宜性虽然受到了不断的质疑,但其客观上确实一定程度降低了通货膨胀不确定性的长期成分。 相似文献
17.
模糊数学在环境质量评价中的应用 总被引：1，自引：0，他引：1
现行环境质量评价分级标准存有不确定性，模糊数学评价可以对这一不确定性的变化范围予以精确的界定。结合模糊数学的方法原理，阐述了模糊数学在环境质量评价中的必要性，并结合丽水瓯江流域水质模糊数学评价，剖析了模糊数学评价环境质量的应用程序，并进行了应用探讨。 相似文献
18.
19.
Uncertainty is a key variable in fostering curiosity, which, in turn, is associated with learning. Yet, research in educational contexts rarely takes uncertainty into account, and rarely explores uncertainty and curiosity in the context of complex instructional activities. One concern with uncertainty is that it can provoke negative affect. Providing learners with expectations of future uncertainty may attenuate their feelings of negative affect. In a study with 138 middle school students learning physics concepts, we examined the relationship between uncertainty, curiosity, learning, transfer, and affect. Some students were given an inherently uncertain form of instruction, called Invention, in which information on how to solve the problem was initially withheld, while others were given direct instruction with all the necessary information to solve similar problems beforehand (No Uncertainty condition). Some of the students receiving uncertain instruction were given expectations about feeling uncertain (Expected Uncertainty condition), and some were not (Unexpected Uncertainty condition). Students in the unexpected uncertainty condition were the most curious, while students in the no uncertainty condition were the least curious. However, giving expectations of uncertainty reduced students’ negative affect. All groups learned the content equally well, but the expected and unexpected uncertainty groups exhibited greater transfer. Further, positive affect predicted learning, above and beyond condition, and curiosity predicted transfer, but not above and beyond condition. This study extends existing research on uncertainty and curiosity by studying these constructs in real classrooms, in the context of an exploratory learning paradigm, and by considering curiosity’s effect on transfer, rather than just learning. This work also demonstrates a practical approach for educators to foster students’ curiosity and transfer. 相似文献