冷蒸气-原子荧光光谱法测定化探样品中痕量汞

建立了冷蒸气-原子荧光光谱法测定化探样品中痕量汞的方法.研究了仪器的工作条件、试剂浓度等因素对汞原子原子荧光强度的影响,探讨了共存离子对汞测定的干扰和消除方法.方法的检出限为0.04ug.L-1,RSD为0.51%～2.90%,加标回收率为91.8%～107.6%.     

Development of Teaching and Technology Integration: Focus on Pedagogy

The development, implementation, review, and subsequent revision of a capstone assignment during teacher education candidates' field experience and the assignments-related rubric was based on research that points teacher education programs to give candidates experiences in rethinking their views of pedagogy as they integrate technology into the curriculum. The initial development of the rubric came as a result of requirements of national accrediting organizations for licensure programs to have performance assessments of their candidates. The review of the assignment by technology experts as well as education faculty showed a disconnect between the goals of the technology faculty and the mentors helping the candidates implement technology during their field experiences. As a result of this disconnect, we developed a new set of indicators for the technology section of the assignment and provided examples of lessons that showed low and high expectations of technology use.     

Quantification of Helicobacter pylori levels in soil samples from public playgrounds in Spain

Helicobacter pylori are ubiquitous Gram-negative bacteria with a high estimated level of infection in the world populations, but a majority of the infected persons are asymptomatic. This pathogen has been classified by the World Health Organization as a class I carcinogen and recognized as the causal agent of most peptic ulcers and chronic gastritis that might lead to stomach cancer. Although not all the transmission pathways of these bacteria into humans have been properly identified, enough data have suggested that the oral-oral or fecal-oral ones are the main infection routes. Helicobacter pylori have been detected in non-treated water and in drinking water, which suggested that water might be an important infection source. As childhood is the critical period of infection, the aim of the present work was to examine the presence of Helicobacter pylori in soil samples from public playing areas of Spanish parks.     

体育统计资料收集时应注意的几个问题

完整、准确的数据资料是做好统计分析的重要条件，原始数据资料的错误和缺失是难以用统计方法弥补的，因此，必须十分重视资料的收集。数据资料收集时应注意的几个问题，包括资料的完整性、有效性、可靠性及代表性等。     

红外光谱的固体样品制备及应用（Ⅱ）—粉末样品的制备及应用

阐述了红外光谱的固体粉末样品制备技术，并用实例介绍了其在研究工作中的应用。     

煤心煤样制备方法的探究

煤心煤样的制备和一般的商品煤煤样、煤层煤样的制备有较大区别,主要是收到的煤样重量一般无法满足GB/T 474表1中对应粒度与留样质量的要求,而且由于勘察的需要对13mm以下的各种项目的煤样要求较多。本文就围绕如何标准化、规范煤心煤样的制备方法所作的一些探究工作做了比较详尽的论证和论述。     

Apriori算法在物联网(IOT)数据挖掘中的应用

为了提高物联网海量数据的分析处理能力,采用Apriori算法对物联网数据进行规则关联处理。首先对物联网数据进行样本划分,并采用矩阵的方式存储,接着对数据样本进行标准化处理,并得到模糊相似矩阵,最后采用Apriori算法根据频繁项集进行规则关联。本文采用基于物联网的数字图书馆作为仿真对象,对用户行为数据进行数据挖掘,实验证明,该方法完成的物联网数据规则关联,置信度高,具有一定的应用价值。     

The Reliability of Observations of Talkativeness and Social Contact among Nursery School Children by the “Short Time Sample” Technique

In 1958, Page conducted a large multiple experiment: 74 teachers gave one class its normal quiz, scored and graded it in the usual way, assigned three comment treatments to students in stratified-random blocks, and then reported scores from the next objective quiz. There was a highly significant effect of comments. Others have borrowed some study features, with results that have appeared mixed. Here, a critical overall analysis shows much agreement with the ordered hypothesis of comments and with specified comments over no comments (p < .01). Despite great variety of designs and subtlety of effect, results broadly support teachers who comment. A typical effect size is demonstrated for ranks, and lessons are taken about the proper strategies for designs and the future of such research.     

计算机智能辅助评分系统定标集选取和优化方法研究

在计算机智能评分研究中,选取定标样本对建立评分模型至关重要。通过对不同定标集人机评分的对比研究,提出“专家随机抽取+智能挑选样卷+聚类分段补充”的定标集选取方法。这种方法提升了评分模型对于各分数段的建模能力,符合高考等考试环境下考生成绩呈正态分布的特点,拓展了对专家评分和阅卷教师评分的综合学习能力,使得计算机智能辅助评分系统能够通过深度学习的方法,更加全面地理解和掌握评分标准。