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于宝霞 《河南广播电视大学学报》2002,15(4):59-59
滴定分析是通过标准溶液的浓度和体积来计算分析结果的.为使结果符合所要求的准确度,就必须准确地确定标准溶液,准确地测量溶液的体积. 相似文献
53.
研究了时间测度链上的一类具有多时滞变系数的二阶中立型非线性的泛函动态方程的振荡性质,借助时间测度链上的有关理论和一些分析技巧,得到了该类方程所有解振荡的新准则,并同时得到了该方程所有解的△-导数振荡的充分条件,推广和改进了现有文献中的一些已知结果。 相似文献
54.
李致富 《淮南师范学院学报》2014,(3):83-86
运用文献资料、访谈、逻辑分析等研究方法,以合肥市为例,对合肥市近20多年来举办的大型体育赛事进行了梳理,总结了目前合肥市举行大型体育赛事面临的问题。并依此提出合肥市举办大型体育赛事发展定位的短期、中期和长期目标,以及逐步递进、城市战略发展、品牌培育、合作共赢、举市而为、精细运作的赛事举办策略。 相似文献
55.
庞丽艳 《宁夏师范学院学报》2014,35(3):19-24
研究了时标上一类带有无穷时滞的Nicholson型系统的正概周期解的存在性,并给出一个例子说明其结果的可行性. 相似文献
56.
Jeanine L. Romano Jeffrey D. Kromrey Corina M. Owens Heather M. Scott 《Journal of Experimental Education》2013,81(4):382-383
In this study, the authors aimed to examine 8 of the different methods for computing confidence intervals around alpha that have been proposed to determine which of these, if any, is the most accurate and precise. Monte Carlo methods were used to simulate samples under known and controlled population conditions wherein the underlying item distribution is nonnormal and when the items’ responses are those of rating scales rather than dichotomous items. Overall, one can conclude that, despite concerns expressed over the use of Fisher's method for coefficient alpha, in general, it actually outperformed the other methods. Larger sample sizes and larger coefficient alphas also resulted in better band coverage, whereas smaller number of items resulted in poorer band coverage. 相似文献
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Although Likert-type rating scales are used in a great number of early childhood studies, knowledge of how the number of response options affects the psychometric properties of scales used with children is limited. The purpose of this study is to contribute to this knowledge. Data were collected from second grade students and third grade students. Accordingly, 1,092 second- and third-graders completed a 2-point, 3-point, and 4-point version of the School Attachment Scale for Children and Adolescents. Participants came from 11 schools, different in terms of socioeconomic status. The children received the versions approximately three weeks apart. Results revealed that as the number of response options increased, the means tended to decrease and the distribution to be normal. For the 2-point version, most items were below the cut-off point in terms of discrimination indexes. Compared to the 2-point version, there was a significant increase in discrimination indexes for the 3- and 4-point versions, and the items’ discrimination indexes were high. It was concluded that the reliability coefficient increased with an increasing number of response options for all subdimensions of the scale. When the validity estimations of the three subdimensions were examined for the three versions of the scale, it was found that the 3- and 4-point versions were appropriate for the validity and that the validity of the 2-point version was weak. It was observed that using 2-point Likert-type scales with children negatively affected the psychometric properties and that these properties improved with an increased number of response options. 相似文献
59.
杨甲山 《中国科学院大学学报》2012,(6):731-737
研究时间测度链上的一类具有非线性中立项的二阶非线性变时滞动力方程的振动性. 利用时间测度链上的理论和一些分析技巧, 通过引入参数函数和Riccati变换, 得到该方程振动的几个充分条件. 给出了一些例子以说明主要结论. 相似文献
60.
基于非局部理论,建立了受初始拉力的纳米梁的横向自由振动的力学模型。考虑了非局部效应对于固有频率和振动模态的影响,并以两端简支纳米梁为例,运用分离变量法和多尺度分析法考察了梁的线性振动特征。分别讨论了振动模态与无量纲化轴坐标,以及固有频率与非局部参量的关系。两种方法求得结果非常接近,这证明了新建纳米梁横向振动模型的有效性。 相似文献