Magnetic Field Diffusion Through Infinite Conducting Media     

G.F. Nalesso  A. Stella 《Journal of The Franklin Institute》1981,311(2):67-92

The diffusion of the magnetic field due to a step current in an infinitely long ideal conductor, through infinite media is discussed. An analytical solution of the field diffusion through two concentric cylinders of different conductivity is derived using a generalized Ohm's law which considers both solid and fluid conductors. A rigorous mathematical treatment which can be generalized to any number of conducting cylinders is presented.The limiting case of an external superconducting medium is discussed and it is shown that with all the other parameters fixed it represents a lower limit in diffusion time.  相似文献   

Factors that Influence Information-Seeking Behavior: The Case of Greek Graduate Students     

Stella Korobili  Aphrodite Malliari 《The Journal of Academic Librarianship》2011,37(2):155-165

The purpose of this survey is to determine the information-seeking behavior of graduate students of the Faculties of Philosophy (8 Schools) and Engineering (8 Schools) at the Aristotle University of Thessaloniki. Discipline did not seem to affect information-seeking behavior critically. The majority of the sample demonstrated a low to medium level of information-seeking behavior. This survey revealed the need for improving the level of graduate students' information literacy skills.  相似文献   

The Role of Text Memory in Inferencing and in Comprehension Deficits     

Anh N. Hua  Janice M. Keenan 《Scientific Studies of Reading》2014,18(6):415-431

Comprehension tests often compare accuracy on inferential versus literal questions and find inferential harder than literal, and poor comprehenders performing worse than controls. Difficulties in integration are assumed to be the reason. This research explores another reason—differences in memory for the passage information underlying the questions. Thirty-nine poor comprehenders and 39 controls were given multiple-paragraph passages, which they retold before answering questions. Retellings permitted assessing question accuracy as a function of memory for the text underlying each question. Inferential accuracy was poorer than literal, and the expected group effect was obtained. However, when text memory was perfect, group differences disappeared, indicating that poor comprehenders can generate inferences as well as controls, if they have the relevant information in memory. These findings show that text memory is crucial in distinguishing poor comprehension.  相似文献   

ERIC/CUE: Urban education research information     

Eva Oppenheim  Stella Torgoff 《The Urban Review》1980,12(3):163-168

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Ethnic identity and close friendship in Chinese-American college studentsL'identité ethnique et l'amitié intime chez les étudiants chinoisaméricainsIdentidad etnica y amistad intima entre estudiantes chino-americanos     

Stella Ting-Toomey 《Int J Intercult Relat》1981,5(4):383-406

This article reports an empirical study on the relationship between ethnic identity and close friendship communication patterns in Chinese-American students. The friendship communication variables were: proximity, network size, frequency of interaction, perceived similarity, and degree of intimacy between subjects and close friends. Several hypotheses in this study were confirmed. Generation difference was a reliable predictor of ethnic identity on the 1st and 2nd generation subjects. Proximity was found to be a crucial factor that influenced the ethnicity of subjects' close friendship networks. All friendship variables were related on the zero-order correlation analyses. However, the relationship between ethnic identity and the ethnicity of subjects' friendship networks was not supported. This was explained in terms of sample bias, and the variable of friendship as a universal relational bond that transcends culture. The paper concludes with a set of research questions for future work on ethnic identity and cross-cultural friendship communication.  相似文献   

The Impact of an Early Literacy Initiative on the Long Term Academic Success of Diverse Students     

Stella SiWan Zimmerman  Michael C. Rodriguez  Kirsten L. Rewey  Sandra L. Heidemann 《Journal of Education for Students Placed at Risk》2013,18(4):452-481

The primary goal of the Words Work (WW) early literacy initiative was to prepare diverse students to become successful learners in school. Four groups of students were followed over 6 years: students from traditional Head Start (HS) centers, students from augmented HS centers (WW students), students eligible for HS but not enrolled (waitlist or WL), and a random sample of non-Head Start students (NHS). Students received school readiness instruction at approximately 4 years of age, and their performance on standardized tests was followed from 1st grade through 5th grade. WW students significantly outscored HS, WL, and NHS students of similar backgrounds in reading and outscored WL and NHS students in mathematics on 2nd-grade standardized assessments. In addition, WW students were able to maintain their lead through 5th grade in both reading and mathematics. Based on these results, WW is an effective HS enhancement for minimizing the achievement gap often observed between students who may be at risk for academic difficulty and students who are at low risk.  相似文献   

Reading Comprehension Tests Vary in the Skills They Assess: Differential Dependence on Decoding and Oral Comprehension     

Janice M. Keenan  Rebecca S. Betjemann  Richard K. Olson 《Scientific Studies of Reading》2013,17(3):281-300

Comprehension tests are often used interchangeably, suggesting an implicit assumption that they are all measuring the same thing. We examine the validity of this assumption by comparing some of the most popular reading comprehension measures used in research and clinical practice in the United States: the Gray Oral Reading Test (GORT), the two assessments (retellings and comprehension questions) from the Qualitative Reading Inventory (QRI), the Woodcock–Johnson Passage Comprehension subtest (WJPC), and the Reading Comprehension test from the Peabody Individual Achievement Test (PIAT). Modest intercorrelations among the tests suggested that they were measuring different skills. Regression analyses showed that decoding, not listening comprehension, accounts for most of the variance in both the PIAT and the WJPC; the reverse holds for the GORT and both QRI measures. Large developmental differences in what the tests measure were found for the PIAT and the WJPC, but not the other tests, both when development was measured by chronological age and by word reading ability. We discuss the serious implications for research and clinical practice of having different comprehension tests measure different skills and of having the same test assess different skills depending on developmental level.  相似文献   

Choice of Reading Comprehension Test Influences the Outcomes of Genetic Analyses     

Rebecca S. Betjemann  Janice M. Keenan  Richard K. Olson  John C. DeFries 《Scientific Studies of Reading》2013,17(4):363-382

Vowel representations are particularly difficult for children to learn because most vowel phonemes can be spelled in several different ways. Children in Grades 1, 2, and 3 spelled nonwords with an ambiguous vowel and reported their spelling strategies. Analysis of the children's spellings and strategy reports revealed a shift in relying solely on phonological information to considering orthographic information for making vowel letter choices. Implications for vowel spelling development are discussed.  相似文献   

《纸牌屋》:权力制高点的政治游戏     

Stella 《英语沙龙》2013,(5)

剧情梗概 经过数轮激烈角逐,新一届美国总统加勒特·沃克诞生,自称"水管工"的众议院多数党党鞭弗兰西斯·安德伍德在其背后功不可没.然而高傲自大的政客弗兰西斯并未如愿当上国务卿,他为此恼怒不已,发誓要将背叛了自己的沃克拉下宝座.利用新总统拟推的综合教育改革法,弗兰西斯操纵《华盛顿先驱报》女记者佐伊·巴恩斯大做文章.初战告捷,他旋即指派手下对新政府展开新的围剿,同时巧妙化解躲避来自政敌的明枪暗箭.他犹如来自伊甸园的毒蛇,巧舌如簧,紧紧咬住所有人的弱点,以实现自己的目的."没有永远的敌人,只有永远的利益",这句话在弗兰西斯身上得到了最佳体现……  相似文献   

Learning technology and disability—Overcoming barriers to inclusion: Evidence from a multicountry study     

Marion Hersh  Stella Mouroutsou 《British journal of educational technology : journal of the Council for Educational Technology》2019,50(6):3329-3344

The paper uses data from a 15-country study to discuss the factors which affect the use of information and communication technologies (ICT) and learning technologies by disabled people and consequently their access to education. Significant differences were found both between and within countries: income and language were the main factors affecting availability. Thus, the greatest availability was in the higher income English-speaking countries and the richer European countries. The main barriers to technology use included cost, lack of funding and lack of information. A particular disparity in technology access was found between the English-speaking European population and Aboriginal speakers of indigenous languages in Australia, with considerably greater access by the former than the latter group. A number of recommendations are presented to increase access to learning and assistive technologies by disabled people. They include encouragement for developers to produce free of charge (minority language) technologies, research on more effective provision of technologies and personal assistance, assistive technology centres in all learning institutions, simple funding mechanisms and a fund to support technology provision in poorer countries.  相似文献