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正古语曰"善治秦者先治水"。2019年初,敖汉旗水利局新一届领导班子针对"十年九旱"严重贫水的旗情,研讨确定并启动实施了"四水"工程,即"蓄住天上水,用好地表水,节约地下水,改优人饮水"。敖汉旗水利局迅速将美好蓝图刻画在山川大地上。一年来,全体水利工程技术人员"不忘初心,牢记使命",宵衣旰食、栉风沐雨奋战在水利工程建设第一线,强化重点项目引领,扎实做好中小河流治理、农村饮水安全、水土保持治理等重点水利工程项目建设,全面推行河长制,开展 相似文献
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形成并成功地实施一套完整的超高真空获得方案,以满足兰州重离子加速器冷却储存环(HIRFL-CSL)6×10-9Pa超高真空度的要求.这套方案包括合理选择和配置真空排气系统及其他设备、合理选择材料、采用真空炉除气及在线烘烤等有效措施及大幅度降低材料出气率等.首先在样机上获得了5×10-10Pa的超高真空度,然后将样机的成功经验应用于HIR-FL-CSR大型超高真空系统.目前,已建成的各子系统真空度达到了(2×10-9~4×10-10)Pa. 相似文献
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The new accelerator project ( HIRFL-CSR ) constructed at the Heavy Ion Research Facility in Lanzhou (HIRFL) is approaching completion. It is a multipurpose cooler-storage-ring system, consisting of a maim ring (CSRm), an experimental ring (CSRe) and two transfer beam lines. The UHV system of CSRm is the most representative subsystem in the project. To minimize the beam loss due to charge exchange of the heavy ions with the residual gas molecules, the pressure of the CSRm vacuum system should reach 3.5 × 10^-9 Pa (N2 equivalent) and the pressure of 8 × 10^-10 Pa is expected for very heavy ion such as uranium to make its lifetime longer than 50 s in the ring. Now, the vacuum system of CSRm has been completed and a pressure less than 5 × 10^-10 Pa has been obtained. In this paper the layout of the CSRm vacuum system, the vacuum equipment in CSRm, the treatment method for the CSRm vacuum chambers, and the installation and operation of the system will be reported. 相似文献
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