《帝国幻景:跨越清宫绘画的边界》(Imperial Illusions:Crossing Pictorial Boundaries in the Qing Palaces,2015)是圣路易斯华盛顿大学艺术史和考古学的副教授李启乐(Kristina Kleutghen)出版的第一本专著。该书采用了一大批之前未曾...《帝国幻景:跨越清宫绘画的边界》(Imperial Illusions:Crossing Pictorial Boundaries in the Qing Palaces,2015)是圣路易斯华盛顿大学艺术史和考古学的副教授李启乐(Kristina Kleutghen)出版的第一本专著。该书采用了一大批之前未曾完整公布的故宫通景画材料,通过对这些画作所处的空间原境进行分析,试图论证欧洲视觉形式在清宫是如何被整合吸收的,并由此探讨由文化交流碰撞所带来的中国画内部体系重组。展开更多
Dense-medium cyclones have been used for beneficiation of fine particles of coal. In this study, the usability of cyclones in the beneficiation of tailings of a coal preparation plant was investigated. For this purpos...Dense-medium cyclones have been used for beneficiation of fine particles of coal. In this study, the usability of cyclones in the beneficiation of tailings of a coal preparation plant was investigated. For this purpose, separation tests were conducted using spiral concentrator and heavy medium cyclones with the specific weight of medium 1.3-1.8 （g/cm^3） on different grading fractions of tailing in an industrial scale （the weight of tail sample was five tons）. Spiral concentrator was utilized to beneficiate particles smaller than 1 mm. In order to evaluate the efficiency of cyclones, sink and float experiments using a specific weight of 1.3, 1.5, 1.7 and 1.9 g/cm^3, were conducted on a pilot scale. Based on the obtained results, the recovery of floated materials in cyclones with the specific weight of 1.40, 1.47 and 1.55 g/cm^3 are 17.75%, 33.80%, and 50%, respectively. Also, the cut point （Pso）, which is the relative density at which particles report equally to the both products are 1.40, 1.67 and 1.86 g/cm^3. The probable errors of separation for defined specific weights for cyclones are 0.080, 0.085 and 0.030, respectively. Also, the coefficients of variation was calculated to be 0.20, 0.12 and 0.03. Finally, it could be said that the performance of a cyclone with a heavy medium of 1.40 g/cm^3 specific weight is desirable compared with other specific weights.展开更多
文摘《帝国幻景:跨越清宫绘画的边界》(Imperial Illusions:Crossing Pictorial Boundaries in the Qing Palaces,2015)是圣路易斯华盛顿大学艺术史和考古学的副教授李启乐(Kristina Kleutghen)出版的第一本专著。该书采用了一大批之前未曾完整公布的故宫通景画材料,通过对这些画作所处的空间原境进行分析,试图论证欧洲视觉形式在清宫是如何被整合吸收的,并由此探讨由文化交流碰撞所带来的中国画内部体系重组。
文摘Dense-medium cyclones have been used for beneficiation of fine particles of coal. In this study, the usability of cyclones in the beneficiation of tailings of a coal preparation plant was investigated. For this purpose, separation tests were conducted using spiral concentrator and heavy medium cyclones with the specific weight of medium 1.3-1.8 （g/cm^3） on different grading fractions of tailing in an industrial scale （the weight of tail sample was five tons）. Spiral concentrator was utilized to beneficiate particles smaller than 1 mm. In order to evaluate the efficiency of cyclones, sink and float experiments using a specific weight of 1.3, 1.5, 1.7 and 1.9 g/cm^3, were conducted on a pilot scale. Based on the obtained results, the recovery of floated materials in cyclones with the specific weight of 1.40, 1.47 and 1.55 g/cm^3 are 17.75%, 33.80%, and 50%, respectively. Also, the cut point （Pso）, which is the relative density at which particles report equally to the both products are 1.40, 1.67 and 1.86 g/cm^3. The probable errors of separation for defined specific weights for cyclones are 0.080, 0.085 and 0.030, respectively. Also, the coefficients of variation was calculated to be 0.20, 0.12 and 0.03. Finally, it could be said that the performance of a cyclone with a heavy medium of 1.40 g/cm^3 specific weight is desirable compared with other specific weights.
