The overlying strata spatial structure academic viewpoint thinks the primary factor which controls the stope presses is the overlying strata spatial structure movement; the spatial structure above the later period coa...The overlying strata spatial structure academic viewpoint thinks the primary factor which controls the stope presses is the overlying strata spatial structure movement; the spatial structure above the later period coal pillar surrounded by mined areas is the most complex overlying strata spatial structure and study on its evolution law has the important realistic project significance for strata movement control and production safety. The existing research results indicate that the special structure of the first working face of the mine begins to develop lengthways from stratum movement above mined areas and extends level in the exploitation direction. From existing overlying strata spatial structure fundamental research achievement, the spatial structure above the later period coal column surrounded by mined areas have following characteristic： The spatial structure formation is from the top to the lower and from large to small. According to the findings, a formula with the use of rock layer migration angle delta was put forward to estimate isolated island coal column width on which different stratum structure is gonging to form.展开更多
The exchange bias （EB） has been investigated in magnetic materials with the ferromagnetic （FM）/antiferromagnetic （AFM） contacting interfaces for more than half a century. To date, the significant progress has be...The exchange bias （EB） has been investigated in magnetic materials with the ferromagnetic （FM）/antiferromagnetic （AFM） contacting interfaces for more than half a century. To date, the significant progress has been made in the layered magnetic FM/AFM thin film systems. EB mechanisms have shown substantive research advances. Here some of the new advances are introduced and discussed with the emphasis on the influence of AFlVl layer, the interlayer EB coupling across nonmagnetic spacer, and the interlayer coupling across AFlVl layer, as well as EB related to multiferrioc materials and electrical control.展开更多
文摘The overlying strata spatial structure academic viewpoint thinks the primary factor which controls the stope presses is the overlying strata spatial structure movement; the spatial structure above the later period coal pillar surrounded by mined areas is the most complex overlying strata spatial structure and study on its evolution law has the important realistic project significance for strata movement control and production safety. The existing research results indicate that the special structure of the first working face of the mine begins to develop lengthways from stratum movement above mined areas and extends level in the exploitation direction. From existing overlying strata spatial structure fundamental research achievement, the spatial structure above the later period coal column surrounded by mined areas have following characteristic： The spatial structure formation is from the top to the lower and from large to small. According to the findings, a formula with the use of rock layer migration angle delta was put forward to estimate isolated island coal column width on which different stratum structure is gonging to form.
基金supported by China National Funds for Distinguished Young Scientists (Grant No. 51025103)the National Basic Research Program of China (Grant Nos. 50872118 and 58021001)
文摘The exchange bias （EB） has been investigated in magnetic materials with the ferromagnetic （FM）/antiferromagnetic （AFM） contacting interfaces for more than half a century. To date, the significant progress has been made in the layered magnetic FM/AFM thin film systems. EB mechanisms have shown substantive research advances. Here some of the new advances are introduced and discussed with the emphasis on the influence of AFlVl layer, the interlayer EB coupling across nonmagnetic spacer, and the interlayer coupling across AFlVl layer, as well as EB related to multiferrioc materials and electrical control.
