Measurement of the Potassium Content of Different Food Samples with High Purity Germanium Detectors

Measurements of the potassium content of samples of food, performed with High Purity Germanium detectors, are presented in this paper. The potassium content was measured by identifying the 1460 keV photons produced in the decay of the isotope 40K. Samples were selected, for which a high potassium content was expected. The measurements confirmed the expectations qualitatively, but not always quantitatively. Especially the expected dependence of the potassium content of chocolate on the listed percentage of cacao could not be confirmed.

确保灵活和可靠生产的高性能板坯连铸机

高连铸比和高产品质量是快速收回设备投资的基础。西门子奥钢联开发了众多技术方案,为此创造了条件。先进的冷却系统确保了全面灵活的生产和稳定的产品质量。西门子奥钢联Dynacs 3D冷却模型加上3DSprays动态喷淋宽度调节,通过位置控制液压缸自动定位喷嘴,沿整个铸流宽度优化了水量分布,避免了板坯角部过冷。利用传统的弧形连铸机浇铸更厚的板坯,是又一个市场趋势。西门子奥钢联于2010年6月投产了秦皇岛首秦连铸机,对这一市场需求作出了回答。这是世界上第一台采用直结晶器生产400 mm厚板坯的弧形连铸机。由于铸流的最终凝固发生在矫直区之后,生产能力远高于采用固态矫直的连铸机,因而在生产成本方面具有明显的优势。之后,西门子奥钢联又于2011年3月在韩国浦项钢铁公司浦项厂投产了一台浇铸厚度达到400mm的双流超厚板坯连铸机。连铸机的设计遵循了Connect&Cast(即连即铸)理念,确保了所有设备功能和模型从投产伊始全部正常发挥作用。因此,达产速度快成为了西门子奥钢联连铸机的标志。本文将介绍西门子奥钢联先进工艺包在亚洲板坯连铸机上的成功应用及其获得的收益。