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61.
Richard L. Allington 《Contemporary educational psychology》1981,6(2):135-139
Thirty educable mentally retarded (EMR) children were presented an item selection task to assess their sensitivity to orthographic structure in printed English words. Analyses of performance indicated that EMR children do acquire implicit knowledge of orthographic rules and that this ability is related to the development of reading skills. 相似文献
62.
A national survey of multicultural and ethnic attitudes in Canada was conducted in 1974 (n = 1849). Data were analysed for the 1244 respondents whose ethnicity could be determined as Angloceltic, French, German, Italian or Ukrainian Canadian, A five group by five group intergroup attitude matrix was created, with each group acting both as attitude object and as holder of attitudes. Analysis indicated the existence of reciprocity or balance in the matrix: groups tended to reflect the attitude held toward them back onto the group holding the attitude. However this structural balance was moderated by the existence of shared attitudes about the position of a group in the national ethnic hierarchy. Further analysis indicated the existence of ethnocentrism in the matrix: attitudes toward ingroup and positive reference groups were more positive than toward out-groups. Perceived intergroup similarity and familiarity were positively correlated with each other and with intergroup acceptance. Results were discussed in relation to attitude balance theory and ethnocentrism theory, and in their implication for intergroup research in multicultural societies. 相似文献
63.
沈洋 《上海海事大学学报》2002,23(1):69-75
计算机分形学是用来描述具有自相似性曲线的一门新学科。这里讨论了集成软件中典型分形曲线和图案的计算机生成方法 :VonKoch曲线、Peano曲线、Sierpinski三角型、Sierpinski地毯、Sierpinski海棉体和Mandelbrot集 ;还介绍了D0L系统的原理和如何用这个系统构造简单植物树木形态以及有关程序的一些特点 相似文献
64.
Fred L. Casmir 《Int J Intercult Relat》1983,7(3):309-324
The thought models and theories of many individuals and disciplines have contributed to the study of human communication. In recent years scholars have become increasingly aware of the fact that methodologies superimposed upon the actual event of human communication have significantly shaped our perceptions of these events. Going beyond methodological approaches or quarrels, a phenomenological basis requires direct encounter with the event and an attempt to let methodology evolve out of that direct encounter, rather than attempting a so-called objective approach. Self, experience, values, and human relationships are of primary concern to the phenomenologist who sees meaning and interpretation as a unitary concept. Phenomenology thus concerns itself with understanding, and the bases for such understanding, rather than with the mere application of methodology. At the same time, phenomenology by its very approach, concerns itself not merely with the discovery of some abstract truth, but must be deeply concerned also with the improvement of the human condition founded in conscious experience. Behavior and meaning thus become conjoined. The ultimate aim of phenomenological studies becomes a concern with the ontological as well as the epistemological bases of human understanding. 相似文献
65.
Major channels of communication are examined for two major functions: providing news of the ethnic community, and linking ethnics to the “mother country.” The four major channels are: interpersonal channels (friends and neighbors), radio, local metropolitan daily newspapers, and ethnic-language newspapers. Size of ethnic group is linked to channel preference, and greater ethnicity is related to a preference for ethnic media for both functions. Lower SES ethnics lend to rely more on interpersonal communication and ethnic media, while higher SES ethnics turn more to metro media and magazines. Channel preference as indicated by respondents is also linked to actual usage patterns. 相似文献
66.
67.
Two experimental procedures for positively modifying the attitudes of regular classroom children towards the handicapped were conducted. In both studies, curriculum and/or experiences with the handicapped were introduced to randomly selected groups of regular class elementary children. The curriculum consisted of literature, filmstrips, and lectures about handicapped children, while the experiences consisted of controlled integrational activities. The results indicated that the procedures were partially successful in modifying the attitudes of regular class children towards the handicapped. It was concluded that techniques must be developed systematically for achieving more positive attitudes in regular class children if “mainstreaming” is to become an effective educational concept. 相似文献
68.
Christian Köhler 《Research Policy》2012,41(8):1344-1356
The shift toward more open and interconnected innovation activities has been a major topic in recent academic and practitioner discussions. Firms must connect their in-house R&D activities with external partners, such as leading customers or universities, to increase the effectiveness of their innovation activities. Hence, management needs to define where to search for valuable knowledge in its environment. In this paper we argue that knowledge search has to reflect the heterogeneity of various knowledge sources with regard to the knowledge they can provide and how these sources can be activated. We hypothesize that search strategies driven by science, suppliers and the product market will contribute differently to innovation success with new-to-market versus imitated products. Moreover, we explore the effect of these types of knowledge search within different sectoral patterns of innovation. Our empirical analysis rests on a sample of almost 5000 firms from five Western European countries. The results support our hypotheses and highlight the potentials and shortcomings of different types of knowledge search. 相似文献
69.
70.
景天三七中总黄酮提取条件和含量分析 总被引:2,自引:0,他引:2
目的:研究不同提取溶剂对景天三七中总黄酮的含量影响及最佳提取条件下总黄酮的含量。方法:采用盐酸一镁粉法和醋酸铅法对景天三七中总黄酮进行检识,并用不同溶剂对景天三七中总黄酮进行了提取,以分光光度法测定总黄酮含量,以芦丁为标准品,以10%AI(NO2)3-5%NaNO2为显色剂,在508nm波长处进行测定。结果:检识试验证明景天三七中含有黄酮类物质,且最佳提取溶剂为80%乙醇(P〈0.05)。在此提取条件下,测得景天三七中总黄酮的含量为18.39mg·g~,RSD为2.2%(n=5)。总黄酮测定线性范围为15.20-45.60beg·mL^-1。(r=0.9997),平均回收率为95.74%,RSD为0.98%(n=6)。结论:景天三七中黄酮类物质的最佳提取溶剂为80%乙醇。本法准确可靠,重现性好,结果稳定,适合于景天三七中总黄酮含量分析。 相似文献