科克苏-穹库什太古生代构造-岩浆作用及其对西南天山造山时代的约束

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.     

Neural Correlates of Self and Its Interaction With Memory in Healthy Adolescents

Adolescence is marked by the development of personal identity and is associated with structural and functional changes in brain regions associated with Self processing. Yet, little is known about the neural correlates of self‐reference processing and self‐reference effect in adolescents. This functional magnetic resonance imaging study consists of a self‐reference paradigm followed by a recognition test proposed to 30 healthy adolescents aged 13–18 years old. Results showed that the rostral anterior cingulate cortex is specifically involved in self‐reference processing and that this specialization develops gradually from 13 to 18 years old. The self‐reference effect is associated with increased brain activation changes during encoding, suggesting that the beneficial effect of Self on memory may occur at encoding of self‐referential information, rather than at retrieval.     

Formation d'ingénieurs et ouverture internationale: une nouvelle exigence pour les écoles d'ingénieurs

La coopération internationale entre établissements d'enseignement supérieur et plus précisément entre établissements formant des ingénieurs relève encore bien souvent du paradoxe: on en parle comme d'une nécessité évidente, mais la désire-t-on vraiment et la pratique-t-on en sachant bien ce que l'on fait?     

Mathématique et affectivité

Summary This article sums up a survey carried out on pupils of 15 to 18 years of age to study the relations existing between mathematics and affectivity. Pupils were considered according to their sex and whether they were in literary or scientific streams.This work has been carried out according to a clinical method based on 60 recorded interviews and also according to an experimental method based on 600 sets of questions. Its objective was to show in which way mathematics can be considered as a support for libidinal cathexis used by the unconscious through various mechanisms.This research work has been published in: Mathématique et Affectivité, Édition Stock, Paris.     

Mastery learning and students' attributions at the college level

This study was designed to determine whether the more favorable learning conditions provided by mastery learning procedures result in higher levels of achievement and more internal attributions on the part of college students. One hundred twenty-two undergraduate students enrolled in a general education course at a large state university participated in the study. Results showed that although students in mastery-taught sections did attain significantly higher levels of achievement no differences in attribution change were identified. Possible reasons for the lack of attribution change are discussed.An earlier version of this paper was presented at the annual meeting of the American Educational Research Association Montreal, Canada, 1983.