在混凝土坝中利用冷却水管中循环冷水来降低混凝土内部水泥的水化热温升，是混凝土坝温度控制的最有效措施。

The cooling pipe, using circling cooled water to reduce the heat of hydration in concrete DAMS, is the most efficient method for temperature controlling in concrete DAMS.

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因此，无磁杜瓦在使用过程中反复冷却及复温所产生的循环应力载荷，是导致其真空性能下降的一个重要原因。

Therefore, the cyclic stress caused by repeatedly cooling and heating during the usage of non-magnetic Dewar is one of the important reasons that causes the decrease of vacuum performance.

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试验结果表明，焊后炉中冷却始温对焊缝焊接强度影响最大，冷却时间次之，焊前脱水方式对焊接强度影响最小。

The test results indicate that cooling beginning temperature after brazing is most influential to its joint strength, then the cooling hours and finally the way of dehydrating before brazing.

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