The wide-angle seismic profile between Menglian and Malong crosses the Baoshan block (Gondwana-typed), and Simao and southwestern Yangtze blocks (Yangtze-typed). By in-terpreting the wide-angle seismic data, we obtain...The wide-angle seismic profile between Menglian and Malong crosses the Baoshan block (Gondwana-typed), and Simao and southwestern Yangtze blocks (Yangtze-typed). By in-terpreting the wide-angle seismic data, we obtained the seismic crust/upper mantle structure of P-wave velocities together with the seismic reflections of these three blocks, Changning- Menglian and Mojiang suture zones among the mentioned three blocks. Our interpreting results demonstrate that the P-wave crustal velocity of Simao block is slower than that of Baoshan and southwestern Yangtze block and the crustal thickness gradually thickens from the Baoshan block, Simao to southwestern Yangtze block. Crustal reflection patterns of these three blocks have dis-tinct differences too. For the Gondwana-typed blocks, seismic reflections in the upper crust are well developed while in middle-lower crust they are very weak. The crustal reflections in the Yangtze block are very well developed. The crustal reflection patterns in Simao and southwest-ern Yangtze blocks are distinguishable. The average thickness of the crust in the studied area is about 40 km. And we make some discussions on the crustal thickening model of the three blocks in western Yunnan and tectonic setting of seismic developing and interaction of Gondwana and Yangtze blocks.展开更多
The 2D-layer compound ([Na-2(C8H12N2O3)(4)(C2H6SO)(4)(W6O19)](n) 1, M-r = 2133.98) synthesized by the reaction of sodium tungstate and barbitone sodium in the solution of DMSO and water has been characterized by IR an...The 2D-layer compound ([Na-2(C8H12N2O3)(4)(C2H6SO)(4)(W6O19)](n) 1, M-r = 2133.98) synthesized by the reaction of sodium tungstate and barbitone sodium in the solution of DMSO and water has been characterized by IR and Raman spectra, elemental analysis and TGA. X-ray diffraction analysis indicates that Compound 1 crystallizes in the monoclinic system, space group C2/c with a 14.8026(4), b = 17.3012(3), c = 19.6379(5) A, beta = 98.6300 degrees, V = 4972.4(2) angstrom(3), Z = 4, F(000) 3928, D-c = 2.851 and mu = 14.101 mm(-1). 1 has a two-dimensional layer structure with hexapolyoxotungstate building blocks and coordinated sodium chains.展开更多
The coefficients of friction and squeezing of the key blocks comer in the roof structure of underground coalface are key factors to roof structure stability quantitative analysis. In this paper, through the special t...The coefficients of friction and squeezing of the key blocks comer in the roof structure of underground coalface are key factors to roof structure stability quantitative analysis. In this paper, through the special test of three-type corner friction and squeez- ing of real rock specimens, and physical simulation test on the roof key blocks of roof structure as well as the finite element calcula- tion of the corner stress distribution and failure mechanism, the characteristics of friction and squeezing of the roof key blocks comer are revealed. It is found that the friction angle of the roof key blocks corner is the residual friction angle, and the frictional angle of the roof key blocks is 22-32° (average 27°), so the friction coefficient is determined as 0.5. It also found the squeezing strength is less than the uniaxial strength, and the squeezing coefficient of the roof blocks corner is determined as 0.4. Based on the results, the ground control theory can be updated from qualitative analysis to quantitative analysis.展开更多
基金supported by a“973”Project of the Ministry of Science and Technology of China(Grant No.2002CB412604)by the Key Project of the Innovation Program of the Chinese Academy of Sciences(Grant No.KZCX2-109).
文摘The wide-angle seismic profile between Menglian and Malong crosses the Baoshan block (Gondwana-typed), and Simao and southwestern Yangtze blocks (Yangtze-typed). By in-terpreting the wide-angle seismic data, we obtained the seismic crust/upper mantle structure of P-wave velocities together with the seismic reflections of these three blocks, Changning- Menglian and Mojiang suture zones among the mentioned three blocks. Our interpreting results demonstrate that the P-wave crustal velocity of Simao block is slower than that of Baoshan and southwestern Yangtze block and the crustal thickness gradually thickens from the Baoshan block, Simao to southwestern Yangtze block. Crustal reflection patterns of these three blocks have dis-tinct differences too. For the Gondwana-typed blocks, seismic reflections in the upper crust are well developed while in middle-lower crust they are very weak. The crustal reflections in the Yangtze block are very well developed. The crustal reflection patterns in Simao and southwest-ern Yangtze blocks are distinguishable. The average thickness of the crust in the studied area is about 40 km. And we make some discussions on the crustal thickening model of the three blocks in western Yunnan and tectonic setting of seismic developing and interaction of Gondwana and Yangtze blocks.
基金The project was supported by the 973 program of the MOST (001CB108906), the National Natural Science Foundation of China (20425313, 20333070 and 20303021), the Natural Science Foundation of Fujian Province, the Chinese Academy of Sciences and Fujian University of Technology (GY-Z0321)
文摘The 2D-layer compound ([Na-2(C8H12N2O3)(4)(C2H6SO)(4)(W6O19)](n) 1, M-r = 2133.98) synthesized by the reaction of sodium tungstate and barbitone sodium in the solution of DMSO and water has been characterized by IR and Raman spectra, elemental analysis and TGA. X-ray diffraction analysis indicates that Compound 1 crystallizes in the monoclinic system, space group C2/c with a 14.8026(4), b = 17.3012(3), c = 19.6379(5) A, beta = 98.6300 degrees, V = 4972.4(2) angstrom(3), Z = 4, F(000) 3928, D-c = 2.851 and mu = 14.101 mm(-1). 1 has a two-dimensional layer structure with hexapolyoxotungstate building blocks and coordinated sodium chains.
基金This research was financially supported by the National Natural Science Foundation of China (No.50104009) and the Key Scienceand Technology Research Subject of the Ministry of Education of China (No.204183).
文摘The coefficients of friction and squeezing of the key blocks comer in the roof structure of underground coalface are key factors to roof structure stability quantitative analysis. In this paper, through the special test of three-type corner friction and squeez- ing of real rock specimens, and physical simulation test on the roof key blocks of roof structure as well as the finite element calcula- tion of the corner stress distribution and failure mechanism, the characteristics of friction and squeezing of the roof key blocks comer are revealed. It is found that the friction angle of the roof key blocks corner is the residual friction angle, and the frictional angle of the roof key blocks is 22-32° (average 27°), so the friction coefficient is determined as 0.5. It also found the squeezing strength is less than the uniaxial strength, and the squeezing coefficient of the roof blocks corner is determined as 0.4. Based on the results, the ground control theory can be updated from qualitative analysis to quantitative analysis.
