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61.
依据二甲氧基羟基苯芴酮与锗的显色原理,用分光光度法对薏米中微量锗进行测定.研究了于HAC-NaAC的缓冲体系,在溴化十六烷基三甲铵(CTMAB)存在下,二甲氧基羟基苯芴酮与Ge(Ⅳ)形成红色络合物,其络合物的最大吸收波长为529nm,Ge(Ⅳ)在0-1.0ug/mL范围内符合比尔定律.拟定方法具有较好的选择性,多数金属离子不干扰检测,用于薏米中微量有机锗的测定,该方法简单可靠,并获得满意的分析结果. 相似文献
62.
来仪 《西南民族大学学报(人文社会科学版)》2007,28(8):1-8
新中国坚持马克思主义民族平等、团结的基本原则,确立了各民族共同繁荣发展的根本立场.国家通过立法、司法、民族政策以及其他行政举措等多种方式和途径,保障各民族的合法权益并形成了相关的保障机制.在此过程中,我国各民族获得了国家主人翁的权利和地位,各民族人民的利益得到了比较有效的保护,为维护国家统一、巩固和发展社会主义民族关系、促进各民族共同团结奋斗和共同繁荣发展提供了基本保证. 相似文献
63.
64.
Two open problems are described for the hyperbolic secant distribution, as a special case of the more general Meixner hypergeomet-ric distribution. The first concerns the completeness of the family of functions sech θ x , θ≥ 0. The second concerns the characterization of the class of canonical correlation sequences in bivariate distributions with marginals sech θ x , sech θ y. In both cases some partial results are put forward. 相似文献
65.
66.
Lai DW 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2006,22(1):121-141
In Canada, there is a lack of research on gambling among the older adults from ethnic minority groups, especially the older Chinese. In this study, two research questions were used to examine gambling among the older Chinese: (1) What is the pattern of gambling among the older Chinese in Canada? (2) What are the predictors associated with gambling among the older Chinese in Canada? The data for this study were collected as part of a multi-site study on health and well-being of 2272 older Chinese in Canada. Four main questions related to gambling were used in this study. Among the 2257 participants who answered the questions on gambling, 26.6% of them reported that they gambled. Results of the hierarchical logistic regression analysis showed that being male, having lived in Canada longer, having a higher level of social support, having more service barriers, and having a stronger level of Chinese ethnic identity would increase the probability for an older Chinese to participate in gambling. Conversely, having a post-secondary and above level of education and having a higher level of life satisfaction would reduce one’s probability of gambling. Although city of residency was also significant in predicting gambling, further analysis showed that its effect was actually caused by other factors including services barriers, social support, life satisfaction, Chinese ethnic identity, and education. 相似文献
67.
消费社会的商业和文化逻辑推动中国电影专注于符号价值的生产,形成了新的美学形态和营销理念。在大众媒介帮助下,围绕电影的符号消费,一个个具有独特气质的排他性文化团体建立了起来。符号价值冲击着中国电影的大众属性,造成了电影文化生态的失衡,影响了中国电影的文化公平。现实主义电影以内容为王,提供共通的体验,是一个有效的解决策略。 相似文献
68.
In this article, we investigate the limitations of traditional quantile function estimators and introduce a new class of quantile function estimators, namely, the semi-parametric tail-extrapolated quantile estimators, which has excellent performance for estimating the extreme tails with finite sample sizes. The smoothed bootstrap and direct density estimation via the characteristic function methods are developed for the estimation of confidence intervals. Through a comprehensive simulation study to compare the confidence interval estimations of various quantile estimators, we discuss the preferred quantile estimator in conjunction with the confidence interval estimation method to use under different circumstances. Data examples are given to illustrate the superiority of the semi-parametric tail-extrapolated quantile estimators. The new class of quantile estimators is obtained by slight modification of traditional quantile estimators, and therefore, should be specifically appealing to researchers in estimating the extreme tails. 相似文献
69.
Brownian motion has been used to derive stopping boundaries for group sequential trials, however, when we observe dependent increment in the data, fractional Brownian motion is an alternative to be considered to model such data. In this article we compared expected sample sizes and stopping times for different stopping boundaries based on the power family alpha spending function under various values of Hurst coefficient. Results showed that the expected sample sizes and stopping times will decrease and power increases when the Hurst coefficient increases. With same Hurst coefficient, the closer the boundaries are to that of O'Brien-Fleming, the higher the expected sample sizes and stopping times are; however, power has a decreasing trend for values start from H = 0.6 (early analysis), 0.7 (equal space), 0.8 (late analysis). We also illustrate study design changes using results from the BHAT study. 相似文献
70.
Lawrence W.C. Lai K. W. Chau Frank T. Lorne Weisheng Lu 《Planning Practice and Research》2020,35(1):51-61
ABSTRACTInformed by a Coasian transaction cost paradigm enriched by the concept of Schumpeterian innovations, this paper discusses the advantages of using experimental coastal reclamation of the sea to build new cities with a policy for fostering innovations. A new development area at the margin of Shenzhen in China, Qianhai, is used to demonstrate how urban expansion by urban sprawling in a megacity can be avoided by reclamation of marginal land as analytically less costly than along intra-marginal land and more suitable for experimentation for the type of megacity concept that Qianhai aims to achieve. 相似文献