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1.
蒋尔雄 《上海大学学报(英文版)》2004,8(4):369-377
QL(QR) method is an efficient method to find eigenvalues of a matrix. Especially we use QL(QR) method to find eigenvalues of a symmetric tridiagonal matrix. In this case it only costs O( n^2) flops, to find all eigenvalues. So it is one of the most efficient method for symmetric tridiagonal matrices. Many experts have researched it. Even the method is mature, it still has many problems need to be researched. We put forward five problems here. They are: (1) Convergence and convergence rate; (2) The convergence of diagonal elements; (3) Shift designed to produce the eigenvalues in monotone order; (4) QL algorithm with multi-shift; (5) Error bound. We intoduce our works on these problems, some of them were published and some are new. 相似文献
2.
Robert Lee Mayes Jennifer Harris Forrester Jennifer Schuttlefield Christus Franziska Isabel Peterson Rachel Bonilla Nissa Yestness 《International Journal of Science Education》2013,35(4):635-658
The ability of middle and high school students to reason quantitatively within the context of environmental science was investigated. A quantitative reasoning (QR) learning progression was created with three progress variables: quantification act, quantitative interpretation, and quantitative modeling. An iterative research design was used as it is the standard method for the development of learning progressions. The learning progression was informed by interviews of 39 middle and high school students from 5 schools in the Western USA using QR assessments. To inform the lower anchor, intermediate levels, and upper anchor of achievement for the QR learning progression, an extensive review of the literature on QR was conducted. A learning progression framework was then hypothesized. To confirm the framework, three QR assessments within the context of environmental literacy were constructed. The interviews were conducted using these QR assessments. The results indicated that students do not actively engage in quantitative discourse without prompting and display a low level of QR ability. There were no consistent increases on the QR learning progression either across grade levels or across scales of micro/atomic, macro, and landscape. 相似文献
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AbstractPopular media often reports on the carbon footprint of certain activities, items or people. We were curious to explore how people make sense of these news pieces, and specifically, whether and how carbon literacy (CL) and quantitative literacy (QL) influences their reasoning. We interviewed and surveyed students of various backgrounds using simulated news pieces of three carbon footprints: that of Facebook, that of the US dairy industry, and that of the US chocolate industry. We found that being highly carbon or quantitatively literate influenced participants’ reaction – but only while they were gathering information about the prompts. The effect of literacies disappeared when they were asked to decide whether the carbon footprint was worrisome or which they would tackle first as a policy-maker. We describe and categorize the strategies students used to make sense of carbon footprints, and link the frequency of using particular strategies to their carbon and quantitative literacy. Implications for future research and environmental education are discussed. 相似文献
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Elena Bray Speth Jennifer L. Momsen Gregory A. Moyerbrailean Diane Ebert-May Tammy M. Long Sara Wyse Debra Linton 《CBE life sciences education》2010,9(3):323-332
Biology of the twenty-first century is an increasingly quantitative science. Undergraduate biology education therefore needs to provide opportunities for students to develop fluency in the tools and language of quantitative disciplines. Quantitative literacy (QL) is important for future scientists as well as for citizens, who need to interpret numeric information and data-based claims regarding nearly every aspect of daily life. To address the need for QL in biology education, we incorporated quantitative concepts throughout a semester-long introductory biology course at a large research university. Early in the course, we assessed the quantitative skills that students bring to the introductory biology classroom and found that students had difficulties in performing simple calculations, representing data graphically, and articulating data-driven arguments. In response to students'' learning needs, we infused the course with quantitative concepts aligned with the existing course content and learning objectives. The effectiveness of this approach is demonstrated by significant improvement in the quality of students'' graphical representations of biological data. Infusing QL in introductory biology presents challenges. Our study, however, supports the conclusion that it is feasible in the context of an existing course, consistent with the goals of college biology education, and promotes students'' development of important quantitative skills. 相似文献
5.
相玉红 《宁波职业技术学院学报》2011,(6):93-95
通过对处于知识经济大背景下的图书馆编目工作的研究,引出急需引入知识管理模式．从而实现从定量管理到知识管理的创新的结论。从图书馆编目定量管理人手,分析了编目工作发展的四大趋势及现状,并从知识管理的定义,人性化管理手段,加强培训,提高业务水平;挖掘采编部隐性知识,建立SNS、论坛或QQ群,加强与外界沟通等五个方面对知识管理在编目管理中应用进行了探讨。 相似文献
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Eucharia Onyema Ejechi 《Educational gerontology》2013,39(5):328-337
The quality of life (QL) of retired academics reengaged in some Nigerian Universities was studied using physical health, subjective happiness, life satisfaction and psychological well-being domains and a measure based on control, autonomy, self-realization and pleasure (CASP) as indicators. Satisfactory QL was indicated all respondents (>50% maximum points), but physical health was poor (<30%). Compared to the preretirement period, respondents indicated satisfactory present condition. Significant differences (t test) due to gender, age, living with/without spouse, mandatory/voluntary retirement, and rank occurred in some QL indicators. Except for physical health, the QL indicators were positively associated (r = .31–0.69, p < .05–0.01). Satisfactory location was indicated and was positively related to subjective happiness (r = .52–.76). Thus, the QL of reengaged retired academics did not deteriorate because of continued activity. 相似文献
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在教育科学研究中,究竟该使用定量还是质性的研究方法常常使研究者感到困惑。比较这两种方法可以发现纯粹的定量或质性的研究方法在运用中都有其优势与局限性。教育研究对象的复杂性决定了两种方法整合的必要性,而默会知识论也为其整合提供了新的视角。 相似文献
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在对小型水泥，、化肥、石膏等粉状物料包装机的结构进行分析的基础上，改变了原设计方案，改进后的包装机不但使称量精度、自动化程度、生产效率得到提高，而且可以避免堵料，减少包装时的扬尘。 相似文献
9.
采用文献计量学方法．选取《中国学术期刊网》与《中文维普科技全文数据库》为检索工具,对1994年-2008年15年间所发表的关于“汉水文化研究”的329篇研究论文为分析数据,从文献总量分布、期刊分布、作者分布及论文主题四个方面,分析和探究目前汉水文化的研究状况。 相似文献
10.
我国傩文化文献研究的计量分析 总被引：1，自引：1，他引：0
展春岚 《遵义师范学院学报》2011,13(3):124-129
文章对1977-2009年在期刊上发表的研究傩文化的文献,从年代分布、期刊发布、论文作者分布、核心作者分布、论文合作情况、基金项目、研究主题进行统计分析,揭示了傩文化文献研究的现状。 相似文献
11.
Sreenivasulu Reddy Mogali Ranganath Vallabhajosyula Chee Hon Ng Darren Lim Eng Tat Ang Peter Abrahams 《Anatomical sciences education》2019,12(6):664-672
In the past, medical museums played a significant role in anatomy and pathology training. The attraction of medical museums has declined recently due to the emergence of information technology and innovative medical curricula. An innovative mobile learning platform has been developed using quick response (QR) codes for the museum specimens at the Lee Kong Chain School of Medicine, Singapore. High-quality images of the potted specimens were captured and combined into an album and a video using Adobe Acrobat Pro 9 and Windows Movie Maker, respectively. Subsequently, QR codes were generated linking to PDF documents with annotations, pathology, and clinical history concerning the specimens. Quick response codes were piloted in gastrointestinal teaching module for Year 2 medical students. Survey responses were obtained from students to verify the efficacy of QR as a learning tool. The majority of students either agreed or strongly agreed that it was easy to access the information about the specimen with QR codes (4.47 ± 0.84), while 96% of students agreed that they are able to correlate the specimen with the annotated images (4.56 ± 0.56). The majority of students (78%) agreed that QR codes are useful for their learning (4.22 ± 0.87), while 75% of students felt QR codes motivate them to visit Anatomy Resource Centre. Most of the students agreed that QR codes are useful for revision of materials (4.13 ± 1.07) and independent learning (4.38 ± 0.87). These findings suggest that QR codes are not only effective for students learning but also enhance their exploration experience with the museum specimens. 相似文献
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利用统计方法以及文献计量方法,以中国1999-2008年的高等教育质量保障研究文献为研究对象,对文献量及发表时间、著者、机构、期刊分布、研究内容等进行了定量分析。结论显示,随着我国高等教育大众化的进一步发展,高等教育质量保障研究日趋受到重视,理论研究的主题也日益多元化,具体化,但研究深度还不够,缺乏实践层面的效果分析,且研究方法比较单一。 相似文献
15.
QR分解和Cholesky分解的Rice条件数 总被引：1，自引：0，他引：1
条件数是在计算过程中由于误差引起的放大系数, 所以条件数理论在误差分析中占有非常重要的地位. 本文运用Rice关于条件数的一般理论, 采取一种统一的方式, 在单参数扰动的情况下, 定义了与正定对称矩阵的Cholesky 分解和一般矩阵的QR分解有关的一些矩阵因子的条件数. 利用解析展开和矩阵向量方程的方法, 求出了用Frobenius 范数所定义的Rice条件数的具体表达式. 所得结果与常小文的结果类似. 在Cholesky分解情况下, 与因子矩阵L 相对应的条件数 KL是 Stewart条件数K的一个下界. 相似文献
16.
AbstractThe authors describe working with partner disciplines during the process of updating mathematics courses for the general education quantitative literacy requirement. The conversations resulted in significant changes to the business calculus course and a rich listing of applications to be incorporated into the college algebra course from technical fields such as industrial design, exercise science, and building science. 相似文献
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高校课堂教学质量评价研究文献定量分析 总被引：1，自引：0，他引：1
利用统计方法与文献计量学方法,以我国在1996～2006年间出版的高校课堂教学质量评价领域的文献为研究对象,对文献量及发表时间、著者、机构、期刊分布、主题内容等进行定量分析。 相似文献
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运用文献计量学的方法,从基金论文比例、资助类型、基金论文作者的单位、地域及合作情况、引文数量、文献分布类型以及来源等角度,对1994~2006年《情报杂志》所载的772篇基金资助论文进行定量分析,以期从基金论文这一角度客观地透视《情报杂志》的学术水平和质量。 相似文献
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汪祎 《四川教育学院学报》2011,27(5):69-73
翻译科研的方向在一定程度上反映翻译研究的发展趋势。选取《中国翻译》为分析样本,从期刊特点、作者来源、论文内容三个方面,对刊登在该期刊上2005年至2009年的学术论文进行定量分析。研究发现：（1）翻译研究以理论研究为重点,翻译涉及视角逐年扩展,研究日渐深入;（2）翻译研究的主要力量多集中于经济发达地区的国内知名高等院校;（3）近5年翻译界除了保持对文化、文学、理论的传统研究之外,增加了对翻译实践、翻译方法的探讨。 相似文献