We have constrained a small-scale,dome-shaped low-velocity structure near the core-mantle boundary(CMB)of Earth beneath Perm(the Perm anomaly)using travel-time analysis and three-dimensional(3-D)forward waveform model...We have constrained a small-scale,dome-shaped low-velocity structure near the core-mantle boundary(CMB)of Earth beneath Perm(the Perm anomaly)using travel-time analysis and three-dimensional(3-D)forward waveform modeling of seismic data sampling of the mantle.The best-fitting dome-shaped model centers at 60.0°E,50.5°N,and has a height of 400 km and a radius that increases from 200 km at the top to 450 km at the CMB.Its velocity reduction varies from 0%at the top to–3.0%at 240km above the CMB to–3.5%at the CMB.A surrounding 240-km-thick high-velocity D''structure has also been detected.The Perm anomaly may represent a stable smallscale chemical pile in the lowermost mantle,although the hypothesis of a developing mantle plume cannot be ruled out.展开更多
On the Penn Territory （Prikamie）, Russia, a systematic study of agarics and aphyllophoroid mushrooms has been conducted since 1975. The territory belongs to taiga. At present about 900 species of agarics and about 3...On the Penn Territory （Prikamie）, Russia, a systematic study of agarics and aphyllophoroid mushrooms has been conducted since 1975. The territory belongs to taiga. At present about 900 species of agarics and about 300 species ofaphyllophoroid mushrooms have been discovered. 139 species of Phylum Basidiomycota （131 species） and Phylum Ascomycota （eight species） can be used for therapeutic purposes. The most common are mushrooms from families Russulaceae （15 species）, Agaricaceae （11 species）, Polyporaceae, Strophariaceae （10 species each）. A considerable part of mushrooms （31 species） has bactericidal properties and 26 species can be used for treating malignant tumors.展开更多
基金the National Natural Science Foundation of China(grant 41474042)the Key Research Program of the Institute of Geology&Geophysics,Chinese Academy of Sciences(IGGCAS)+1 种基金grant IGGCAS-201904the Computer Simulation Lab,IGGCAS and NSF(grants 0911319 and 1214215).
文摘We have constrained a small-scale,dome-shaped low-velocity structure near the core-mantle boundary(CMB)of Earth beneath Perm(the Perm anomaly)using travel-time analysis and three-dimensional(3-D)forward waveform modeling of seismic data sampling of the mantle.The best-fitting dome-shaped model centers at 60.0°E,50.5°N,and has a height of 400 km and a radius that increases from 200 km at the top to 450 km at the CMB.Its velocity reduction varies from 0%at the top to–3.0%at 240km above the CMB to–3.5%at the CMB.A surrounding 240-km-thick high-velocity D''structure has also been detected.The Perm anomaly may represent a stable smallscale chemical pile in the lowermost mantle,although the hypothesis of a developing mantle plume cannot be ruled out.
文摘On the Penn Territory （Prikamie）, Russia, a systematic study of agarics and aphyllophoroid mushrooms has been conducted since 1975. The territory belongs to taiga. At present about 900 species of agarics and about 300 species ofaphyllophoroid mushrooms have been discovered. 139 species of Phylum Basidiomycota （131 species） and Phylum Ascomycota （eight species） can be used for therapeutic purposes. The most common are mushrooms from families Russulaceae （15 species）, Agaricaceae （11 species）, Polyporaceae, Strophariaceae （10 species each）. A considerable part of mushrooms （31 species） has bactericidal properties and 26 species can be used for treating malignant tumors.
