北极是全球气候敏感区域之一,长期以来极地气象观测资料比较缺乏。为了提高北美及全球天气预报的准确性,加拿大航天局联合加拿大环境、气象、国防等部门多个单位共同启动了极地通信和气象卫星(PCW:PolarCommunication and Weather)计划...北极是全球气候敏感区域之一,长期以来极地气象观测资料比较缺乏。为了提高北美及全球天气预报的准确性,加拿大航天局联合加拿大环境、气象、国防等部门多个单位共同启动了极地通信和气象卫星(PCW:PolarCommunication and Weather)计划,持续提供50°N以北地区的通信服务和气象遥感观测。在气象方面,PCW将提供北极极地附近地区每隔15/30min的多光谱遥感信息,重点用于高纬度风场反演、海/湖冰、积雪和植被监测,云、气溶胶和火山灰信息反演,这些遥感信息在气候变化研究中将发挥重要作用。简要介绍了PCW计划的进展、卫星观测系统设计、轨道设计、遥感仪器、气象和空间天气的监测产品及应用。展开更多
The stability of petroleum coke water slurry（PCWS） is currently a hot topic. The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis ...The stability of petroleum coke water slurry（PCWS） is currently a hot topic. The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis in this work. The results showed that the stability of bubble-PCWS was positively related to the yield stress and that the yield stress could be greatly impacted by the operation conditions during preparation of bubble-PCWS. The main factors affecting the yield stress of bubble-PCWS were solid concentration, aeration time and dosage of frother. However, the effects of aperture size of air distribution plates and type of frother on the yield stress were slight within the experimental range. The optimal conditions for the greatest yield stress were as follows： aeration time of 30 min, solid concentration of 65 wt%, frother dosage of0.030 wt% of the air-dried pulverized petroleum coke, aperture size of air distribution plate of 2-5 lm and AOS frother.The yield stress and the pour rate of bubble-PCWS under this optimum operation condition could reach maxima of more than 0.4 Pa and 96%, respectively.展开更多
文摘北极是全球气候敏感区域之一,长期以来极地气象观测资料比较缺乏。为了提高北美及全球天气预报的准确性,加拿大航天局联合加拿大环境、气象、国防等部门多个单位共同启动了极地通信和气象卫星(PCW:PolarCommunication and Weather)计划,持续提供50°N以北地区的通信服务和气象遥感观测。在气象方面,PCW将提供北极极地附近地区每隔15/30min的多光谱遥感信息,重点用于高纬度风场反演、海/湖冰、积雪和植被监测,云、气溶胶和火山灰信息反演,这些遥感信息在气候变化研究中将发挥重要作用。简要介绍了PCW计划的进展、卫星观测系统设计、轨道设计、遥感仪器、气象和空间天气的监测产品及应用。
基金he financial supports from National Natural Science Foundation of China (Grant No. 51506185)Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ15E060002)
文摘The stability of petroleum coke water slurry（PCWS） is currently a hot topic. The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis in this work. The results showed that the stability of bubble-PCWS was positively related to the yield stress and that the yield stress could be greatly impacted by the operation conditions during preparation of bubble-PCWS. The main factors affecting the yield stress of bubble-PCWS were solid concentration, aeration time and dosage of frother. However, the effects of aperture size of air distribution plates and type of frother on the yield stress were slight within the experimental range. The optimal conditions for the greatest yield stress were as follows： aeration time of 30 min, solid concentration of 65 wt%, frother dosage of0.030 wt% of the air-dried pulverized petroleum coke, aperture size of air distribution plate of 2-5 lm and AOS frother.The yield stress and the pour rate of bubble-PCWS under this optimum operation condition could reach maxima of more than 0.4 Pa and 96%, respectively.
