降低采矿贫化率是提高矿山经济效益的主要途径

本文根据撰山子金矿极薄矿脉的开采情况，对１９９３年技术经济指标及今后生产安排进行分析，从而得出结论：降低采矿贫化率是提高岩金矿山经济效益的主要途径。     

同位素稀释与元素稀释

根据两种金属离子与同一试剂反应能力相近,导出较普遍适用的元素稀释式,讨论了依反应产物的可测物理量或选择不同反应,从而实现元素稀释。由此导出含同位素效应的同位素稀释式,并用DDTC/CCl_4萃取Cu~(2+),Pb~(2+)混合物加以验证,还模拟同位素效应下稀释实验,结果与理论相符合。     

高纯Eu_2O_3痕量元素的火花源质谱法测定

本文介绍了采用相对灵敏度因子法和同位素稀释法直接定量分析５Ｎ～６Ｎ的高纯Ｅｕ２Ｏ３，中２０多种痕量元素，大多数元素检测限为０．００ｘμｇ／ｇ，相对标准偏差在３０％以内。其中Ｃｕ、Ｚｎ采用同位素稀释法进行测定，相对标准偏差优于１０％。     

岩石中主成分和微量成分X射线荧光分析的低稀释比玻璃融珠方法

采用ｍ样品：ｍ熔剂为１：２的低稀释比玻璃熔融技术，Ｘ射线荧光法测定岩石中的主成分和微量成分，既提高了灵敏度又不均质效应。与粉末压片方法相比，对硫的分析得到了更好的结果。同时，使用基本参数程序建立了一种新的校正方法来校正由于烧失量、烧增量、释释比或熔剂挥发而导致的分析误差。     

~(147)Nd同位素稀释亚化学计量法测定聚乙炔中钕

钕是稀土催化剂法合成聚乙炔过程中所必需的成分,合成后,钕在聚乙炔中的剩余含量会影响聚合物的稳定性。本文介绍了用同位素稀释亚化学计量法测定聚乙炔中的钕,方法的灵敏度为0.05μg钕。     

浓硝酸稀释工业化专有技术应用

介绍了浓硝酸稀释工业化的工艺方法、设备材料选择及装置运行情况。浓硝酸稀释项目已在我公司成功实施,该装置生产运行稳定、安全可靠、操作方便,具有较好经济效益。     

A Replacement Outfall for Peterhead

The paper describes the design and construction of an outfall into Sandford Bay, Peterhead, on a highly-exposed stretch of the NE coast of Scotland.
The outfall forms part of a drainage system that was installed in the early 1970s to reduce pollution in Peterhead Bay and to accommodate increased flows from oil-related development. It replaces the original outfall, which failed in 1979 due to wave action.
Stability of the new steel-pipe outfall, which was installed by the bottom pull method, is ensured by burial within an excavated rock trench, backfilled and armoured with graded stone.
The exposed location of the site was demonstrated during construction work when bad weather and adverse sea conditions delayed completion by one year.
The paper concludes that the full significance of prevailing sea and weather conditions, and consequently reduced working 'windows', should be taken into account in the planning and programming of outfall work, to reduce the risk of damage to a partially completed and unprotected outfall.     

A dilution refrigerator combining low base temperature,high cooling power and low heat leak for use with nuclear cooling

We describe the design philosophy, design, construction and performance of a dilution refrigerator specifically intended for nuclear cooling experiments in the submillikelvin regime. Attention has been paid from the outset to minimizing sources of heat leaks, and to achieving a low base temperature and relatively high cooling power below 10 mK. The refrigerator uses sintered silver heat exchangers similar to those developed at Grenoble. The machine has a base temperature of 3 mK or lower and can precool a copper nuclear specimen in 6.8 T to 8 mK in 70 h. The heat leak to the innermost nuclear stage is < 30 pW after only a few days' running.