Airgun arrays are widely used in marine seismic exploration because signatures excited by airgun arrays have high energy and high-peak bubble ratio, whereas the considerable length and width of the array and ghost ref...Airgun arrays are widely used in marine seismic exploration because signatures excited by airgun arrays have high energy and high-peak bubble ratio, whereas the considerable length and width of the array and ghost reflections make the airgun array signature directional. As a result, the relation of the reflection amplitude with the incident and azimuth angles is variable. This means that the directivity of the airgun array results in a nonstationary wavelet and distorts the relation of the amplitude variation with the incident and azimuth angles. To remove the directivity effect, we propose a nonstationary inversion-based directional deconvolution. At fi rst, the signature as a function of take-off angle and azimuth angle is calculated using the spatial configuration of the airgun array and the near-field signatures. Then, based on the velocity model, the time-variant take-off angles are estimated and directional fi lters are designed using the take-off angles. Finally, the directivity-dependent signatures are shaped to the signature right below the airgun array using nonstationary inversion in the directional deconvolution.展开更多
Density functional theory（DFT） and coupled cluster theory（CCSD（T）） calculations were employed to investigate the structural and electronic properties of Nb S6^- and Nb S6 clusters. Generalized Koopmans＇ theorem...Density functional theory（DFT） and coupled cluster theory（CCSD（T）） calculations were employed to investigate the structural and electronic properties of Nb S6^- and Nb S6 clusters. Generalized Koopmans＇ theorem was applied to predict the vertical detachment energies and simulate the photoelectron spectra（PES）. The current study indicated that various types of sulfur ligands（i.e., S^（2-）, S^（2-）, S2^（2-） and S3^（2-）） were presented in the lowest-energy structures of Nb S6^（-/0）. The ground-state structure of Nb S6^- is shown to be Cs（~1A＇） symmetry with a terminal S^（2-）, a side-on bound S2^（2-） and a S3^（2-） ligands. Molecular orbital analyses were performed to analyze the chemical bonding in NbS6^（-/0） clusters and elucidate their structural and electronic properties.展开更多
目的 观察硫辛酸联合自体富血小板凝胶(PRG)治疗糖尿病足患者创面修复及抗凝血酶的影响。方法 将糖尿病足患者按随机数字表法分为A、B、C组。A组患者给予硫辛酸治疗,B组患者给予PRG治疗,C组给予硫辛酸联合PRG治疗。比较3组糖尿病足患者...目的 观察硫辛酸联合自体富血小板凝胶(PRG)治疗糖尿病足患者创面修复及抗凝血酶的影响。方法 将糖尿病足患者按随机数字表法分为A、B、C组。A组患者给予硫辛酸治疗,B组患者给予PRG治疗,C组给予硫辛酸联合PRG治疗。比较3组糖尿病足患者创面修复情况以及抗凝血酶指标水平。结果 A、B、C组,每组各40例。治疗后,A、B、C组的总有效率分别为42.86%、48.65%和81.82%,C组的总有效率显著高于A组和B组,差异有统计学意义(P<0.05)。治疗后,A组、B组和C组的肉芽组织覆盖率分别为(25.83±4.61)%、(26.17±4.69)%和(29.57±5.12)%,生长厚度分别为(2.70±0.82)、(2.54±0.65)、(3.81±0.79)mm,创面细菌清除率分别为(24.72±5.16)%、(24.13±5.07)%和(30.57±7.13)%,溃疡修复时间分别为(36.72±3.96)、(37.26±4.02)和(27.11±3.65)d,A、B组各指标与C组相比,差异均有统计学意义(均P<0.05)。治疗后,A组、B组和C组的空腹血糖(FBG)分别为(6.85±1.17)、(6.27±1.22)和(5.63±1.06)mmol·L^(-1),餐后2 h血糖(2 h BG)分别为(9.63±2.54)、(9.92±2.61)和(7.45±1.73)mmol·L^(-1),糖化血红蛋白(HbA1c)水平分别为(8.57±1.78)%、(8.73±1.81)%和(7.18±1.24)%,3组患者的FBG、2 h BG、HbA1c水平相较于治疗前有所下降,且C组的FBG、2 h BG、HbA1c均低于A组、B组(均P<0.05),A组与B组差异无统计学意义(P>0.05)。治疗后,A组、B组和C组的肿瘤坏死因子-α(TNF-α)的表达水平分别为(12.83±2.73)、(12.48±2.66)和(9.15±1.82)ng·L^(-1),同型半胱氨酸(Hcy)的表达水平分别为(16.27±4.79)、(15.75±4.30)和(12.36±3.53)μmol·L^(-1),3组患者的TNF-α、Hcy水平均低于治疗前,且C组的TNF-α、Hcy均低于A组、B组(均P<0.05)。3组患者药物不良反应发生率差异无统计学意义(P>0.05)。结论 硫辛酸联合PRG治疗糖尿病足,可以显著增加治疗总有效率,增加组织的再修复能力,降低糖尿病足患者血糖水平以及炎症因子水平,且2种治疗方式联合的安全系数较高。展开更多
基金the National Natural Science Foundation of China (No.41474109)the China National Petroleum Corporation under grant number 2016A-33.
文摘Airgun arrays are widely used in marine seismic exploration because signatures excited by airgun arrays have high energy and high-peak bubble ratio, whereas the considerable length and width of the array and ghost reflections make the airgun array signature directional. As a result, the relation of the reflection amplitude with the incident and azimuth angles is variable. This means that the directivity of the airgun array results in a nonstationary wavelet and distorts the relation of the amplitude variation with the incident and azimuth angles. To remove the directivity effect, we propose a nonstationary inversion-based directional deconvolution. At fi rst, the signature as a function of take-off angle and azimuth angle is calculated using the spatial configuration of the airgun array and the near-field signatures. Then, based on the velocity model, the time-variant take-off angles are estimated and directional fi lters are designed using the take-off angles. Finally, the directivity-dependent signatures are shaped to the signature right below the airgun array using nonstationary inversion in the directional deconvolution.
基金supported by the National Natural Science Foundation of China(21301030,21371034 and 21373048)the Natural Science Foundation of Fujian Province for Distinguished Young Investigator(2013J06004)Foundation of Fuzhou University(2012-XY-6)
文摘Density functional theory（DFT） and coupled cluster theory（CCSD（T）） calculations were employed to investigate the structural and electronic properties of Nb S6^- and Nb S6 clusters. Generalized Koopmans＇ theorem was applied to predict the vertical detachment energies and simulate the photoelectron spectra（PES）. The current study indicated that various types of sulfur ligands（i.e., S^（2-）, S^（2-）, S2^（2-） and S3^（2-）） were presented in the lowest-energy structures of Nb S6^（-/0）. The ground-state structure of Nb S6^- is shown to be Cs（~1A＇） symmetry with a terminal S^（2-）, a side-on bound S2^（2-） and a S3^（2-） ligands. Molecular orbital analyses were performed to analyze the chemical bonding in NbS6^（-/0） clusters and elucidate their structural and electronic properties.
文摘目的 观察硫辛酸联合自体富血小板凝胶(PRG)治疗糖尿病足患者创面修复及抗凝血酶的影响。方法 将糖尿病足患者按随机数字表法分为A、B、C组。A组患者给予硫辛酸治疗,B组患者给予PRG治疗,C组给予硫辛酸联合PRG治疗。比较3组糖尿病足患者创面修复情况以及抗凝血酶指标水平。结果 A、B、C组,每组各40例。治疗后,A、B、C组的总有效率分别为42.86%、48.65%和81.82%,C组的总有效率显著高于A组和B组,差异有统计学意义(P<0.05)。治疗后,A组、B组和C组的肉芽组织覆盖率分别为(25.83±4.61)%、(26.17±4.69)%和(29.57±5.12)%,生长厚度分别为(2.70±0.82)、(2.54±0.65)、(3.81±0.79)mm,创面细菌清除率分别为(24.72±5.16)%、(24.13±5.07)%和(30.57±7.13)%,溃疡修复时间分别为(36.72±3.96)、(37.26±4.02)和(27.11±3.65)d,A、B组各指标与C组相比,差异均有统计学意义(均P<0.05)。治疗后,A组、B组和C组的空腹血糖(FBG)分别为(6.85±1.17)、(6.27±1.22)和(5.63±1.06)mmol·L^(-1),餐后2 h血糖(2 h BG)分别为(9.63±2.54)、(9.92±2.61)和(7.45±1.73)mmol·L^(-1),糖化血红蛋白(HbA1c)水平分别为(8.57±1.78)%、(8.73±1.81)%和(7.18±1.24)%,3组患者的FBG、2 h BG、HbA1c水平相较于治疗前有所下降,且C组的FBG、2 h BG、HbA1c均低于A组、B组(均P<0.05),A组与B组差异无统计学意义(P>0.05)。治疗后,A组、B组和C组的肿瘤坏死因子-α(TNF-α)的表达水平分别为(12.83±2.73)、(12.48±2.66)和(9.15±1.82)ng·L^(-1),同型半胱氨酸(Hcy)的表达水平分别为(16.27±4.79)、(15.75±4.30)和(12.36±3.53)μmol·L^(-1),3组患者的TNF-α、Hcy水平均低于治疗前,且C组的TNF-α、Hcy均低于A组、B组(均P<0.05)。3组患者药物不良反应发生率差异无统计学意义(P>0.05)。结论 硫辛酸联合PRG治疗糖尿病足,可以显著增加治疗总有效率,增加组织的再修复能力,降低糖尿病足患者血糖水平以及炎症因子水平,且2种治疗方式联合的安全系数较高。
