零能耗太阳能住宅的工业化建造

当前建筑业正处于向工业化发展转型的重要时期,以中国国际太阳能十项全能竞赛(SD 2013)中的北京交通大学"i-Yard"参赛作品为例,重点从建筑部品系统的划分和工业化建造等方面进行解析,为零能耗、可持续建筑的模数化设计和快速工业化生产提供了有益的参考。     

Expanded and Enhanced Deep‐UV Excitations of Mn2+‐Doped Phosphate Glasses Sensitized by Gd3+ Ions

Mn²⁺‐doped phosphate glasses sensitized by Gd³⁺ ions are investigated. Enhanced photoluminescence (PL) properties of the samples are found with the excitations expanding toward the deep‐UV part of the spectrum. PL emission and excitation spectra correlated with the lifetime data consistently present evidences of the enhanced Mn²⁺ emission in association with the energy transfer from Gd³⁺ ions. In particular, the Gd³⁺ codoping benefits greatly the energy harvesting of Mn²⁺ ions, resulting in the enhanced and tunable excitations of Mn²⁺ ions which expand toward the deep‐UV part of the spectrum at 273 and 311 nm, respectively. Thus by Gd³⁺ sensitizing, the excitation source of the Mn²⁺ emission has covered the broad range of the spectrum from the original blue and near‐UVA to the deep‐UVB and UVC together with the enhanced emission in the green‐to‐red spectral region. The possible energy‐transfer mechanisms involved are discussed.     

碘量法—原子吸收光度法测金的方法对比

总结了目前金矿矿山企业实际生产过程中金含量的测定方法的种类及简单的测定原理,并具有针对性的介绍了实际生产中常用的两种测定方法—活性炭富集碘量法和活性炭富集原子吸收法。因两种测定方式中前期的试样处理及富集过程较为相似,于是将两种测定方法的原理,操作过程,数据结果对比分析等方面做了较为详细的讨论。对两种方法在实际操作中存在的问题给予分析,具有较高的实际生产指导意义。