Girdle round the earth

Puck, in a Shakespearean comedy set in Athens, boasted: ‘I'll put a girdle round the earth in forty minutes’. His claim was never realised, but today—thanks to submarine cable technology—the human voice can make this long journey in a tenth of a second. This article reviews the present state of submarine cable technology; its relationship to communication by satellite; and the implications of optical fibre systems.     

World's roof regulates the earth system

<正>Continuing in the NSR tradition to focus on a speciic topic within each issue,the present volume includes a major section devoted to the study of the Tibetan Plateau.Nearly a halfcentury ago,the geoscience community already started to discuss the timings,amplitudes,mechanisms and efects of the Tibetan Plateau uplit.Since then,these basic research themes have not substantially changed,although some terminology has been renewed.Like many scientiic issues,the Tibetan plateau evolution is so complex that we do need decades to understand he relevant scientiic knowledge is also an indispensable for understanding the operation of the earth system.     

青藏线季节性冻土路基填土密实度控制

季节性冻土路基容易出现冻胀、冰浸等病害现象，在施工前要严格按规范选取填料，施工过程中应严格控制填料粒径、含水率、松铺厚度、碾压次数等，确保路基整体质量。