The data of short-period (1~18 s) surface waves recorded by 23 stations belonging to the digital seismic network of Yunnan Province of China are used in this paper. From these data, the dispersion curves of phase velo...The data of short-period (1~18 s) surface waves recorded by 23 stations belonging to the digital seismic network of Yunnan Province of China are used in this paper. From these data, the dispersion curves of phase velocities of the fundamental mode Rayleigh wave along 209 paths are determined by using the two-station narrowband filtering cross-correlation method. Adopting tomography method, the distribution maps of phase velocities at various peri-ods in Yunnan region are inverted. The maps of phase velocities on profiles along 24N, 25N, 26N, 27N and 100.5E and the distribution maps of phase velocities at 3 periods in the study region are given. The results show that the phase velocity distribution in Yunnan region has strong variations in horizontal direction, and the phase velocity distribution in short-period range is closely related to the thickness of sedimentary layers in the shallow crust. The phase velocity in southern part of the Sichuan-Yunnan rhombic block encircled by the Honghe fault and Xiaojiang fault is obviously lower than that in surrounding areas. The epicentral locations of strong earthquakes in Yunnan region are mainly distributed in transitional zones between low and high phase velocities.展开更多
An earthquake with M=6.5 happened on January 15, 2000 in Yaoan of Yunnan Province. After the earthquake, a temporary digital network with 6 detectors around the epicenter area was set up. 402 aftershocks were located ...An earthquake with M=6.5 happened on January 15, 2000 in Yaoan of Yunnan Province. After the earthquake, a temporary digital network with 6 detectors around the epicenter area was set up. 402 aftershocks were located more precisely. According to coda short recording observed, the coda averaging quality factor has been acquired via Satos single scattering model analyses, Qc( f )=49f 0.95,f=1.5~20.0 Hz, which has the attenuation characteristics of high structural active region.展开更多
Summary: To investigate the changes in neurological symptoms and signs, as well as serum copper, serum ceruloplasmin after hepatic transplantation in patients with Wilson’s disease, neurological symptoms and signs, s...Summary: To investigate the changes in neurological symptoms and signs, as well as serum copper, serum ceruloplasmin after hepatic transplantation in patients with Wilson’s disease, neurological symptoms and signs, serum copper, serum ceruloplasmin before and after hepatic transplantation in 18 patients with Wilson’s disease were observed, and those changes were followed up in 20 non-operative controls treated with penicillamine. Our results showed that the neurological symptoms and signs, serum copper and serum ceruloplasmin were improved in the operative group but deteriorated in the non-operative control group. Our study showed that hepatic transplantation is better than penicillamine in the treatment of Wilson’s disease.展开更多
Objective: To evaluate the factors influencing success ra te of in vitro fertilization /embryo transfer(IVF/ET).Methods: A retrospective study of 770 consecutive cycles under gone IVF/ET or intracytoplasmic sperm inje...Objective: To evaluate the factors influencing success ra te of in vitro fertilization /embryo transfer(IVF/ET).Methods: A retrospective study of 770 consecutive cycles under gone IVF/ET or intracytoplasmic sperm injection (ICSI) from March 1999 to June 2 001.Estradiol and progesterone concentrations on the day of hCG administration w ere measured. Factors effecting embryo transfer on the effects of clinical pregn ancy rate were evaluated.Results: The overall clinical pregnancy rate in 770 cycles was 40.8%. Take home baby rate was 31%. No significantly differences rate were obse rved between groups with different estradiol levels.If the progesterone concentr ation on the day of hCG administration was >6.36 nmol/L, the implantation and cl inical pregnancy rate was lower(P<0.003). The lowest clinical pregnancy rat e was observed when the duration of infertility was ≥10 years. The average numb er of embryos transferred was 2.23±0.83.Conclusion: This study demonstrated that the most important fac tor on clinical pregnancy rate was low progesterone concentration on the day of hCG administration. The other two important variables influencing success rate o f IVF/ET were the duration of infertility, the number of high-grade embryos tra nsferred.展开更多
In this paper potential seismic sources in coastal region of South China are identified by integration of genetic algorithm (GA) and back propagation (BP algorithm). GA is used for finding the best parameter combinati...In this paper potential seismic sources in coastal region of South China are identified by integration of genetic algorithm (GA) and back propagation (BP algorithm). GA is used for finding the best parameter combination rapidly in an infinite solution space for artificial neural networks (ANN). The results show that the distribution of potential seismic sources with different upper magnitude demarcated by this classifier is mostly satisfied the intrinsic relationship between seismic environment and earthquake occurrence, with less effect from subjective judgment of human being.展开更多
基金Joint Seismological Science Foundation of China (101086) and the key project "Digital Crustal and Mantle Structure of Chinese Mainland" from China Earthquake Administration.
文摘The data of short-period (1~18 s) surface waves recorded by 23 stations belonging to the digital seismic network of Yunnan Province of China are used in this paper. From these data, the dispersion curves of phase velocities of the fundamental mode Rayleigh wave along 209 paths are determined by using the two-station narrowband filtering cross-correlation method. Adopting tomography method, the distribution maps of phase velocities at various peri-ods in Yunnan region are inverted. The maps of phase velocities on profiles along 24N, 25N, 26N, 27N and 100.5E and the distribution maps of phase velocities at 3 periods in the study region are given. The results show that the phase velocity distribution in Yunnan region has strong variations in horizontal direction, and the phase velocity distribution in short-period range is closely related to the thickness of sedimentary layers in the shallow crust. The phase velocity in southern part of the Sichuan-Yunnan rhombic block encircled by the Honghe fault and Xiaojiang fault is obviously lower than that in surrounding areas. The epicentral locations of strong earthquakes in Yunnan region are mainly distributed in transitional zones between low and high phase velocities.
文摘An earthquake with M=6.5 happened on January 15, 2000 in Yaoan of Yunnan Province. After the earthquake, a temporary digital network with 6 detectors around the epicenter area was set up. 402 aftershocks were located more precisely. According to coda short recording observed, the coda averaging quality factor has been acquired via Satos single scattering model analyses, Qc( f )=49f 0.95,f=1.5~20.0 Hz, which has the attenuation characteristics of high structural active region.
文摘Summary: To investigate the changes in neurological symptoms and signs, as well as serum copper, serum ceruloplasmin after hepatic transplantation in patients with Wilson’s disease, neurological symptoms and signs, serum copper, serum ceruloplasmin before and after hepatic transplantation in 18 patients with Wilson’s disease were observed, and those changes were followed up in 20 non-operative controls treated with penicillamine. Our results showed that the neurological symptoms and signs, serum copper and serum ceruloplasmin were improved in the operative group but deteriorated in the non-operative control group. Our study showed that hepatic transplantation is better than penicillamine in the treatment of Wilson’s disease.
文摘Objective: To evaluate the factors influencing success ra te of in vitro fertilization /embryo transfer(IVF/ET).Methods: A retrospective study of 770 consecutive cycles under gone IVF/ET or intracytoplasmic sperm injection (ICSI) from March 1999 to June 2 001.Estradiol and progesterone concentrations on the day of hCG administration w ere measured. Factors effecting embryo transfer on the effects of clinical pregn ancy rate were evaluated.Results: The overall clinical pregnancy rate in 770 cycles was 40.8%. Take home baby rate was 31%. No significantly differences rate were obse rved between groups with different estradiol levels.If the progesterone concentr ation on the day of hCG administration was >6.36 nmol/L, the implantation and cl inical pregnancy rate was lower(P<0.003). The lowest clinical pregnancy rat e was observed when the duration of infertility was ≥10 years. The average numb er of embryos transferred was 2.23±0.83.Conclusion: This study demonstrated that the most important fac tor on clinical pregnancy rate was low progesterone concentration on the day of hCG administration. The other two important variables influencing success rate o f IVF/ET were the duration of infertility, the number of high-grade embryos tra nsferred.
文摘In this paper potential seismic sources in coastal region of South China are identified by integration of genetic algorithm (GA) and back propagation (BP algorithm). GA is used for finding the best parameter combination rapidly in an infinite solution space for artificial neural networks (ANN). The results show that the distribution of potential seismic sources with different upper magnitude demarcated by this classifier is mostly satisfied the intrinsic relationship between seismic environment and earthquake occurrence, with less effect from subjective judgment of human being.
