致命的闪光     

NOAH SHACHTMAN 《科技新时代》2006,(6):54-61

在经过了数十年的时间和无数次的失败，耗费了数以亿计的美元之后，今天，激光武器终于被露端倪。它们能让战场上的硝烟和爆炸成为历史吗？[编者按]  相似文献   

第一次网络战争     

NOAH SHACHTMAN DAVID AXE 《科技新时代》2006,(7):54-63

驻伊拉克的美军正在进行一场史无前例的战争——一场网络化的战争。但是，对手也同样拥有自己的网络。[编者按]  相似文献   

Teachers' Use of Textbooks: Practice in Namibian science classrooms     

FRED LUBBEN  BOB CAMPBELL  CHOSHI KASANDA  HILENI KAPENDA  NOAH GAOSEB  UTJI KANDJEO-MARENGA 《Educational studies》2003,29(2-3):109-125

Incidences of prescribed textbook usage in science classrooms in Namibia have been analysed using an approach adapted from linguistic analysis. Aspects of pedagogic purpose, text genre, and the social interactions between teachers and learners were used to characterise teacher and learner engagement with textbooks, and thus categorise their usage in relation to a national policy of learner-centred education. Results indicate a teacher dominated textbook use and a low frequency and restricted range of textbook references per lesson, with some 40% of the Senior Secondary classes observed making no use of their textbook in class. The major uses of textbooks in class were for diagrams and data, and to verify factual information. Occasionally, questions in textbooks were used as homework to test and/or consolidate knowledge. Pupils rarely initiated a reference to a textbook. It is suggested that if learners are to benefit fully from the investment in textbooks then their teachers need to be helped to use the resource in more constructive ways.  相似文献