On Jan.31 of 2010,the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin.It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic e...On Jan.31 of 2010,the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin.It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic environment and a low-level historical seismicity.The macro-epicenter of the earthquake is located at Moxi town of Suining city,Sichuan province,China.The earthquake intensity of the epicenter area is degree VII,and the long axis of the isoseismal line trends in NE orientation.The Suining earthquake caused the collapse or destruction of 460 family houses.The earthquake focal mechanism solution and records of the near-field seismographic stations showed the earthquake occurred at the reverse fault at a depth 34 km.Based on the waveform and focal mechanism,we consider the Suning earthquake is triggered by the reverse fault and not by the gravitational collapse or man-made explosive sources.Basing on seismic refraction profile and borehole,we consider that the earthquake is triggered by the backthrust fault of Moxi anticline rooted in detachments at a depth 3-4 km.Furthermore,we infer that tectonic mechanism of the Suining(Ms5.0) Earthquake is driven by the horizontal crustal shortening and stress adjustment on a shallow detachment after the Wenchuan(Ms 8.0) earthquake.展开更多
Objective. To compare the embolization effects of intracranial aneurysms with mechanical detachable spirals (MDS) and with Guglielmi detachable coils (GDC).Methods. One hundred and twenty cases with 125 intracranial a...Objective. To compare the embolization effects of intracranial aneurysms with mechanical detachable spirals (MDS) and with Guglielmi detachable coils (GDC).Methods. One hundred and twenty cases with 125 intracranial aneurysms were embolized in Beijing Hospital from March 1995 to July 1999. Sixty - six aneurysms in 64 cases were embolized with MDS, 51 in 48 with GDC, and 8 in 8 with both MDS and GDC. Clinical data including sex, age, subarachnoid hemorrhage (SAH), Hunt & Hess grading, diameter and neck width of aneurysms, number and length of coils used per aneurysm, occlusive ratio, and complications were compared between MDS and GDC groups.Results. MDS and GDC groups were comparable (t-test or x2 -test, all P value > 0. 10) in terms of age, sex, diameter of aneurysms [ (8. 46 ± 3. 42) mm vs. (7. 38 ± 3. 45) mm], neck width [ (3. 49 ± 1. 50) mm vs. (3. 26 ± 1. 52) mm], coils number[ (4. 65 ± 3. 01) vs. (4. 24 ± 2. 65) ] and their length[ (460. 2 ± 398. 5) mm vs. (422. 9 ±387. 1) mm] used per aneurysm, occlusive ratio in aneurysms embolized ≥80% [ (95. 00% ± 6. 32% ) vs. (94. 19% ± 7. 63% ) ], mortality and permanent complications (7. 8% vs. 4. 2% ).Conclusions. MDS and GDC are all materials for embolization of intracranial aneurysms. MDS is less expensive, but more difficult to control and of propensity to complications while GDC is more compliant, easier to be used, safer, and have many alternative types for use as well as more extensive indications.展开更多
基金the National Natural Science Foundation of China (Grant No. 40841010,40972083,41172162)the National Science and Technology Support Program (Grant nNo. 2006BAC13B02-107,2006BAC13B01-604) for the funding
文摘On Jan.31 of 2010,the Suining earthquake occurred at Suining City whch is located the center of Sichuan Basin.It is unusual for the strong earthquake to occur at the center of Sichuan Basin with a stable geotectonic environment and a low-level historical seismicity.The macro-epicenter of the earthquake is located at Moxi town of Suining city,Sichuan province,China.The earthquake intensity of the epicenter area is degree VII,and the long axis of the isoseismal line trends in NE orientation.The Suining earthquake caused the collapse or destruction of 460 family houses.The earthquake focal mechanism solution and records of the near-field seismographic stations showed the earthquake occurred at the reverse fault at a depth 34 km.Based on the waveform and focal mechanism,we consider the Suning earthquake is triggered by the reverse fault and not by the gravitational collapse or man-made explosive sources.Basing on seismic refraction profile and borehole,we consider that the earthquake is triggered by the backthrust fault of Moxi anticline rooted in detachments at a depth 3-4 km.Furthermore,we infer that tectonic mechanism of the Suining(Ms5.0) Earthquake is driven by the horizontal crustal shortening and stress adjustment on a shallow detachment after the Wenchuan(Ms 8.0) earthquake.
基金This work was originally published in the Chinese Journal of Neuro-surgery (2001 17(2): 87-90) in Chinese.
文摘Objective. To compare the embolization effects of intracranial aneurysms with mechanical detachable spirals (MDS) and with Guglielmi detachable coils (GDC).Methods. One hundred and twenty cases with 125 intracranial aneurysms were embolized in Beijing Hospital from March 1995 to July 1999. Sixty - six aneurysms in 64 cases were embolized with MDS, 51 in 48 with GDC, and 8 in 8 with both MDS and GDC. Clinical data including sex, age, subarachnoid hemorrhage (SAH), Hunt & Hess grading, diameter and neck width of aneurysms, number and length of coils used per aneurysm, occlusive ratio, and complications were compared between MDS and GDC groups.Results. MDS and GDC groups were comparable (t-test or x2 -test, all P value > 0. 10) in terms of age, sex, diameter of aneurysms [ (8. 46 ± 3. 42) mm vs. (7. 38 ± 3. 45) mm], neck width [ (3. 49 ± 1. 50) mm vs. (3. 26 ± 1. 52) mm], coils number[ (4. 65 ± 3. 01) vs. (4. 24 ± 2. 65) ] and their length[ (460. 2 ± 398. 5) mm vs. (422. 9 ±387. 1) mm] used per aneurysm, occlusive ratio in aneurysms embolized ≥80% [ (95. 00% ± 6. 32% ) vs. (94. 19% ± 7. 63% ) ], mortality and permanent complications (7. 8% vs. 4. 2% ).Conclusions. MDS and GDC are all materials for embolization of intracranial aneurysms. MDS is less expensive, but more difficult to control and of propensity to complications while GDC is more compliant, easier to be used, safer, and have many alternative types for use as well as more extensive indications.
