为了提高瓦斯抽采效果,防治煤与瓦斯突出,探讨了煤孔隙内表面的结构特点,从表面自由能的角度揭示了煤-瓦斯之间的界面作用,构建了煤的表面自由能与瓦斯吸附量之间的表达式;利用OCG方法,测定沙曲煤矿煤样的表面自由能在实验室条件下为43....为了提高瓦斯抽采效果,防治煤与瓦斯突出,探讨了煤孔隙内表面的结构特点,从表面自由能的角度揭示了煤-瓦斯之间的界面作用,构建了煤的表面自由能与瓦斯吸附量之间的表达式;利用OCG方法,测定沙曲煤矿煤样的表面自由能在实验室条件下为43.33 m J/m^(2);利用瓦斯抽采流-固-热耦合控制方程,对沙曲煤矿的瓦斯抽采过程进行了数值模拟。研究表明:煤的孔隙内表面处于不均匀的力场之中,煤孔隙内表面相比煤体相内部具有附加的表面自由能,煤孔隙内表面的表面自由能愈大,其吸附能力愈强;煤的表面自由能随瓦斯抽采作业不断增加,且在抽采钻孔附近区域的表面自由能最高;在瓦斯抽采作业之前,通过有效的技术措施降低煤的表面自由能,有利于提高瓦斯抽采效果。展开更多
In recent years, the Western-led globalization has been on the horns of dilemma with endemic political crises occurring in the United States and European countries. Within the West, liberalism and pluralist ideology h...In recent years, the Western-led globalization has been on the horns of dilemma with endemic political crises occurring in the United States and European countries. Within the West, liberalism and pluralist ideology have begun to be critidzed and rejected. What is wrong with the West today？ Is it periodic oscillation, evolutionary setback or fundamental failure？ Is it decadence of political system, failure of state-building or even failure of civilization model？ The general judgment of this essay is that the current crisis in the West is primarily registered as fundamental political systemic crisis.展开更多
文摘为了提高瓦斯抽采效果,防治煤与瓦斯突出,探讨了煤孔隙内表面的结构特点,从表面自由能的角度揭示了煤-瓦斯之间的界面作用,构建了煤的表面自由能与瓦斯吸附量之间的表达式;利用OCG方法,测定沙曲煤矿煤样的表面自由能在实验室条件下为43.33 m J/m^(2);利用瓦斯抽采流-固-热耦合控制方程,对沙曲煤矿的瓦斯抽采过程进行了数值模拟。研究表明:煤的孔隙内表面处于不均匀的力场之中,煤孔隙内表面相比煤体相内部具有附加的表面自由能,煤孔隙内表面的表面自由能愈大,其吸附能力愈强;煤的表面自由能随瓦斯抽采作业不断增加,且在抽采钻孔附近区域的表面自由能最高;在瓦斯抽采作业之前,通过有效的技术措施降低煤的表面自由能,有利于提高瓦斯抽采效果。
文摘In recent years, the Western-led globalization has been on the horns of dilemma with endemic political crises occurring in the United States and European countries. Within the West, liberalism and pluralist ideology have begun to be critidzed and rejected. What is wrong with the West today？ Is it periodic oscillation, evolutionary setback or fundamental failure？ Is it decadence of political system, failure of state-building or even failure of civilization model？ The general judgment of this essay is that the current crisis in the West is primarily registered as fundamental political systemic crisis.
