摘要：本文主要依据某市清远御龙城项目分析,对影响前期成本的相关因素、存在的一些问题等进行研究,并在此基础上提出有效的成本管控对策。

摘要：本文以广州白云机场FBO为例,阐述商务航空服务基地规划布局的特殊性及建筑设计的要点,并强调流线、安防设计、绿色建筑及BIM辅助设计在本类项目设计中的重要性。

摘要：随着时代的发展，全球经济水平的日益提高，对于能源的需求与日俱增，所面临的能源危机也日趋严重，而可再生能源逐渐得到了社会的广泛重视，为社会经济的可持续发展奠定了坚实的基础。由于城市化水平的提高，为建筑行业提供了优良的发展空间，建筑物在日常运行中对于能源的消耗占据着较大的比例。为了改善这一现状，需要在建筑设计阶段加强对可再生能源的重视，节能减排，实现社会的可持续发展。本文从可再生能源的概念着手，分析了可再生能源在建筑设计中的利用的意义，探究了建筑设计中可再生能源的利用。

摘要：Quasi-two dimensional(2D)perovskites have emerged as a promising class of materials due to their remarkable photoluminescence efficiency,which stems from their exceptionally high exciton binding *** spatial confinement of excitons within smaller grain sizes could enhance the formation of biexcitons leading to higher radiative recombination ***,the synthesis of high-quality quasi-2D perovskite thin films with controllable grain sizes remains a challenging *** this study,we present a facile method for achieving quasi-2D perovskite thin films with controllable grain sizes ranging from 500 to 900 *** is accomplished by intermediate phase engineering during the film fabrication *** results demonstrate that quasi-2D perovskite films with smaller grain sizes exhibit more efficient bound exciton generation and a reduced stimulated emission threshold down to 15.89µJ cm^(−2).Furthermore,femtosecond transient absorption measurements reveal that the decay time of bound excitons is shorter in quasi-2D perovskites with smaller grain sizes compared to that of those with larger grains at the same pump density,which is 230.5 *** observation suggests a more efficient exciton recombination process in the smaller grain size *** findings would offer a promising approach for the development of efficient bound exciton lasers.