释“焜黄”

古乐府《长歌行》:“常恐秋节至,尡黄华叶衰。”部编中学语文课本初中第二册178页注:“尡（kun）枯。”盖意即“尡黄”乃枯萎也。又朱东润主编《中国历史文学作品选》上编第一册406页注:“尡（hun混上）黄,色衰枯黄貌。”按此误也。其误盖源于《文选》

Study of the interfacial interactions in the molybdenite floatation system

Interfacial interactions involving Van der Waals force, hydrophobic attractive force and hydration exclusive force were investigated in this paper. The interfacial interactive free energy of a series of interfaces occurring between minerals, water, collectors and bubble was calculated. The results show that a Van der Waals attractive force and a hydrophobic attractive force exist between each mineral and water interface. The hydrophobic attractive force between molybdenite and water is markedly weaker than the hydrophobic attractive force between gangue and water. The hydrophobic attractive force between collector molecules and water is the main driving force that causes the collectors to become dispersed in the pulp. The strong hydrophobic attractive force between molybdenite and the bubble interface is the basic reason for the natural floatability of molybdenite. The Van der Waals force between molybdenite and the collectors is attractive in water solution, but it is not the cause of the main force between them. The main force that results in the collection effect is a hydrophobic attractive force caused by the Lewis acid-base interaction at the molybdenite surface. A floatation experiment shows that the adsorption intensity of the collector on the molybdenite surface is not the crucial factor for molybdenite floatation. Rather, the dispersing capability of the collector in the water phase and its selectivity for the various minerals in the floatation system are more important.

Test of subcritical crack growth and fracture toughness under water-rock interaction in three types of rocks

The subcritical crack growth and fracture toughness in peridotite, lherzolite and amphibolite were investigated with double torsion test. The results show that water-rock interaction has a significant influence on subcritical crack growth. With water-rock interaction, the crack velocity increases, while the stress intensity factor declines, which illustrates that water-rock interaction can decrease the strength of rocks and accelerate the subcritical crack growth. Based on Charlse theory and Hilling & Charlse theory, the test data were analyzed by regression and the correlation coefficients were all higher than 0.7, which shows the correlation is significant. This illustrates that both theories can explain the results of tests very well. Therefore, it is believed that the subcritical crack growth attributes to the breaking of chemical bond, which is caused by the combined effect of the tensile stress and the chemical reaction between the material at crack tip and the corrosive agent. Meanwhile, water-rock interaction has a vital effect on fracture toughness. The fracture toughness of samples under atmospheric environment is higher than that of samples immersed in water. And water-rock interaction has larger influence on fracture toughness in amphibolite than that in peridotite and lherzolite.

向战斗在第一线的女专武干部致敬!

开封市顺河回族区4位女武装部长用汗水书写武装工作辉煌诗篇的事迹很动人。值此“三八”国际妇女节之际,本刊刊登这篇通讯,向她们及战斗在武装工作第一线的全体女专武干部致以崇高的敬礼。并道一声:节日好,你们辛苦了！ 武装工作的基础在基层。而基层武装干部则是战斗在第一线的人。他(她)们身处军地结合部,又都身兼数职,工作任务十分繁重,但工作条件、生活待遇又都比较差,有的在专武工作岗位上干了十几年。几十年来,他们无怨无悔,兢兢业业地工作着,奉献着。他(她)们的动力来自哪里?开封4位女部长用行动作出了回答——来自她们对党的无限忠诚,对武装工作的无限热爱。