The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of he...The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of heat convection is studied. And based on the conservation principle of energy and the real conditions, such as coal temperature,air temperature, the geometry size of roadway, air flux, the oxygen concentration in the loose coal around the roadway, the threshold parameters resulting coal spontaneous combustion are put forward, and the index determining the danger zone liable to self ignite are evaluated. Finally, the method determining the danger zone liable to spontaneous ignition around coal roadway at fully mechanized long wall top coal caving face is put forward. Based on the determination method and real conditions in the roadway, the coal around roadway can be divided four zones.展开更多
A proposal appealing for harsher punishment legislation for negligent parents and guardians has provoked a long and heated online debate in China. During the 2017 Sessions of the National People＇s Congress and the N...A proposal appealing for harsher punishment legislation for negligent parents and guardians has provoked a long and heated online debate in China. During the 2017 Sessions of the National People＇s Congress and the National Committee of the Chinese People＇s Political Consultative Conference （CPPCC）, Li You and 12 other members of the CPPCC National Committee proposed that parents and guardians who cause bodily harm or death to a child as a result of negligence should be punished by the Criminal Law.展开更多
文摘The intensity of heat output of coal, the rate of oxygen consumption and the influence function of coal size are tested by the big coal spontaneous combustion experiment unit. The independence of the coefficient of heat convection is studied. And based on the conservation principle of energy and the real conditions, such as coal temperature,air temperature, the geometry size of roadway, air flux, the oxygen concentration in the loose coal around the roadway, the threshold parameters resulting coal spontaneous combustion are put forward, and the index determining the danger zone liable to self ignite are evaluated. Finally, the method determining the danger zone liable to spontaneous ignition around coal roadway at fully mechanized long wall top coal caving face is put forward. Based on the determination method and real conditions in the roadway, the coal around roadway can be divided four zones.
文摘A proposal appealing for harsher punishment legislation for negligent parents and guardians has provoked a long and heated online debate in China. During the 2017 Sessions of the National People＇s Congress and the National Committee of the Chinese People＇s Political Consultative Conference （CPPCC）, Li You and 12 other members of the CPPCC National Committee proposed that parents and guardians who cause bodily harm or death to a child as a result of negligence should be punished by the Criminal Law.
