施工期碾压混凝土大坝温控防裂分析

高原区由于温差较大、气候影响严重且受日照时间长,混凝土坝建设面临严峻挑战,针对某高原地区碾压混凝土坝水电站建设温控防裂难题,采用仿真模拟利用常规混凝土温控防裂措施如混凝土浇筑温度、混凝土冷却方式、冷却水管布设等进行组合,给出5个施工方案,可为高原区碾压混凝土坝安全建设提供思路。结果表明,增加中期冷却对降低混凝土温度减小最大应力最为显著,减小浇筑温度及减小水冷水管间距同样是高原区混凝土坝温控防裂的有效措施。最后对本工程温控措施给出相应施工标准,可根据具体工程实际调整,该方法可为同类型建设工程提供理论参考。

高速线材轧件不冷段长度失调问题的解决

通过监测现场水箱控制系统的相关数据,对高线水箱控制中出现的线材不冷段长度失调等问题进行研究分析,实施水箱温控系统水冷模式的软硬件调整,达到轧件水冷的精确控制。

Precipitation responses to radiative processes of water- and ice-clouds: an equilibrium cloud-resolving modeling study

Cloud radiative processes are important in regulating weather and climate. Precipitation responses to radiative processes of water- and ice-clouds are investigated by analyzing mean equilibrium simulation data from a series of two-dimensional cloud-resolving model sensitivity experiments in this study. The model is imposed by zero vertical velocity.The exclusion of water radiative processes in the presence of ice radiative processes, as well as the removal of ice radiative processes, enhances tropospheric Iongwave radiative cooling and lowers air temperature and the saturation mixing ratio. The reduction in the saturation mixing ratio leads to an increase in vapor condensation and an associated release of latent heat, which increases rainfall. The elimination of water radiative processes strengthens local atmospheric warming Iongwave radiative cooling. The enhanced warming melting of graupel, which increases rainfa n the upper troposphere via a reduction in ncreases the rain source via an increase in the