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71.
天山造山带是古生代多期碰撞增生作用的产物,其确切的造山时代是当前争议较多的热点问题.分布在西南天山的科克苏-穹库什太剖面经历了复杂的构造变形,最明显的两期变形事件分别为朝北的推覆作用和NE-SW韧性走滑作用.本剖面可分为伊犁岩浆岛弧、伊犁结晶基底、高压变质杂岩三个岩石-构造单元.野外可见黑云母花岗闪长岩侵入到绿片岩相变质岩中,岩脉切穿绿片岩中面理构造.通过锆石U-Pb LA-ICPMS测年,科克苏剖面钾长花岗岩的年龄为341±6Ma和338±8Ma,穹库什太黑云母花岗闪长岩的年龄为313±4Ma.其中,花岗闪长岩发生了黑云母定向排列,通过对黑云母进行^40 Ar/^39 Ar测年,获得坪年龄为263.4士0.6Ma,表明该花岗闪长岩受过后期热事件的干扰.地球化学分析表明,黑云母花岗闪长岩属于钙碱性系列,Nb和Ta含量低而Rb,Ba和TH含量很高,与俯冲作用有关的岛弧岩浆岩地球化学组成非常相似.结合前人对该地区高压变质岩、花岗岩和火山岩的研究成果,本文提出,西南天山俯冲-碰撞造山作用发生在晚石炭世之前,研究区后碰撞区域走滑作用标志着西南天山碰撞造山作用在二叠纪之前全部结束. 相似文献
72.
Gamma photon by gamma photon, throughout almost seven years of perfect operation the European satellite COS-B has produced what amounts to a high-energy chart of the sky: this gives a totally new view of the Milky Way, our Galaxy. COS-B discovered new stars, extraordinarily intense sources of gamma radiation, most of which are invisible at other wavelengths. Are they young pulsars, the remains of supernovae, or evidence of black holes? 相似文献
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The thinking processes of 14 adult Anglophone students of French performing challenging reading and summarizing tasks were compared in their first and second languages. Individuals proved to use equivalent proportions of higher-order problem solving strategies while writing and reading in both languages. These varied with people's levels of literate expertise in their mother tongue, correlating with the qualities of written summaries they produced in both languages. Uses of these problem solving strategies appeared unrelated to participants' levels (beginning and intermediate) of second language proficiency. Analyses of the verbal reports reveal thinking processes which are common to reading and summary writing in first and second languages but which appear to vary with people's literate expertise and relevant knowledge. Findings are interpreted in relation to Cummins' (1984) theories of the cross-linguistic interdependence of cognitive-academic skills and Van Dijk and Kintsch's (1983) model of discourse comprehension. Implications are drawn for theories of bilingual cognition, further research, and instruction in second language reading and writing. 相似文献
75.
Jacques H. A. van Rossum 《High Ability Studies》2001,12(2):181-197
Bloom (1985) reported on the careers of a sample of 120 talented individuals from three domains: science, athletics and the arts. His findings are used as a starting point for the research on professional dance students presented in this article. Three issues were studied: the relevance of significant others in a dance career; the issue of detecting dance talent and, also, using Bloom's proposed three career stages in a talent domain, how teachers are described by students, and what the characteristics of a typical dance class are. A questionnaire was constructed and administered to 129 students in the Dance Department at the Amsterdam School of the Arts, the Netherlands. The results indicate that, in addition to the dance teacher and parents (as highlighted in Bloom's study), peers should also be considered. Furthermore, the majority of students have been labelled "talented" at some point in their career, notably by teachers and other dance experts, while in fact parents played no role here. A new measurement format was introduced in an attempt to reveal the peculiarities of teacher and dance class during the three career stages. The results obtained correspond to Bloom's findings. Therefore, the present study not only supports Bloom's findings in a dance sample, but also offers a generalisation from Bloom's male-dominated sample to a female-dominated one. 相似文献
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77.
Jacques Coenen‐Huther 《Higher Education in Europe》1991,16(4):54-62
The true emancipation of women should become a common European concern and a common European goal. Emancipation means that no socio‐cultural or biological constraint should prevent women from obtaining the same chances and opportunities as men. True emancipation, which is still a distant objective in most of the European countries, implies that access to professional life should not have to be paid for by an exhausting cumulation of domestic and professional roles. A recent research programme on the student population of the University of Geneva provides data which are relevant in this respect. Female students are less likely to have internalized norms of behaviour which facilitate adaptation to a competitive environment in which women have to compete with men. Being subject to cross pressures and torn between two sets of behavioural norms, young women are often ambivalent in their attitudes. The conclusions of the Geneva research are consistent with other research results in other countries. The major explanatory factor is early socialization. True emancipation of women requires a long‐range education policy aiming at gradually reducing the differences in the socialization patterns of boys and girls. 相似文献
78.
Numerical competence in young children and in children with mathematics learning disabilities 总被引:1,自引:0,他引:1
A longitudinal study was conducted on 82 children to investigate, firstly the numerical competence of young children and the predictive value of (pre)-numerical tests in kindergarten, and, secondly, whether children's knowledge of the numerical system and representation of the number size is related to their computation and logical knowledge and to their counting skills. In an additional cross-sectional study on 30 children with a clinical diagnosis of mathematical learning disability (MLD) of 8,5 years, age- and ability-matched with 2 × 30 children the same parameters of numerical competence were assessed. The longitudinal data showed individual differences in numerosity, as well as the relationship between a delay in arithmetics in grade l and problems on numerosity in kindergarten. In the cross-sectional results some evidence was found for the independence of numerical abilities in MLD-children. About 13% of them had still severe pre-numerical processing deficits (in number sequence production, cardinality skills and logical knowledge) in grade 3. About 67% had severe difficulties in executing calculation procedures and a lack of conceptual knowledge. A feature of 87% of the MLD-children was severe translation deficits, with a significantly worse knowledge of number words compared with the knowledge of Arab numerals. Finally a severe deficit in subitizing was found to be present in 33% of the MLD children. On a group level the processing deficits were linked to understanding numerosity, since the ability-matched younger children and the MLD-children had the same pre-numerical and numerical profile. Implications for the assessment of mathematical disabilities and the value of TEDI-MATH® as an instrument in this process are discussed. 相似文献
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