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The Potential of High Power Lasers for Tube cutting.and Concrete Scabbling in Nuclear Decommissioning

稀有金属材料与工程 2011年第S4期40卷 252-256页

作者： Paul Hilton Ali Khan TWI Ltd.Granta Park Cambridge CB21 6ALUK

Contaminated concrete and metal pipework presents a major nuclear decommissioning challenge in terms of the total volumes of material to be treated,the radiation levels present and the number of facilities *** recently,industrial lasers have often been seen as too unreliable for use in nuclear decommissioning environments and hence their usage has been *** advent of solid state 'fibre' lasers has,however,provided a robust and reliable industrial tool,capable of performing not only concrete scabbling but other laser based decommissioning processes,such as *** concrete scabbling has been demonstrated in the laboratory,to date,no representative scale demonstration has been provided which would give industry confidence in the *** paper will describe the development of a laser scabbling process head,equipped with an integrated debris collection device and adaptive control system for automatic maintenance of the attitude and stand off distance of the head from the concrete *** results of using optical fibre delivered laser power to remove the surface of a range of representative and large scale concrete samples will be *** 5kW of laser power,removal rates up to 7000 cc of concrete per hour have been recorded at a removal depth of the order *** paper will also report on the results of using the same laser source,for single-sided cutting.of various 304L stainless steel tubes,of diameter up to 170mm and wall thickness up to *** results show that with the right optical configuration,it is entirely possible to laser cut tubes from one side,at extremely long and safe standoff distances,if the main objective is simply to sever the tube.

关键词： lasers concrete scabbling tube cutting.

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Developing stages and causes of desertification in the Mu Us sandland

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Chinese Science Bulletin 1999年第9期44卷 845-849页

作者： Bo Wu Longjun Ci Chinese Acad Forestry Chinese Res & Dev Ctr Combating Desertificat Beijing 100091 Peoples R China

Based on historical aerial photography of three periods and together with field investigation, the status of desertification development after the 1950s in the Mu Us sandland was analyzed, the difference of the desertification developing speed at two stages was compared, and its possible causes were explored. The results show that the developing speed of desertification from the late 1970s to the early 1990s is apparently slowed down, compared with that from the late 1950s to the late 1970s and there exists an obvious recovery trend at the second stage. The difference between the two stages accounts for severely over-reclaiming, over-grazing and unrestricted cutting.during the first stage, which are the main causes of desertification development in the semi-arid steppe and arid desert steppe areas.

关键词： Mu Us sandland desertification developing stage over-reclaiming over-grazing unrestricted cutting.

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