We estimated crustal v p/ v s ratio of Tibetan Plateau by combined inversion of Love and Rayleigh wave dispersion data. It is developed by us that the joint inversion methods using both Love and Rayleigh wave dispersi...We estimated crustal v p/ v s ratio of Tibetan Plateau by combined inversion of Love and Rayleigh wave dispersion data. It is developed by us that the joint inversion methods using both Love and Rayleigh wave dispersion data. Thickness and S\|wave velocity of each sub layer are taken from Love wave dispersion data, then P\|wave velocity structure was deduced using Rayleigh wave dispersion data. Densities of sub layers were estimated by the empirical relationships between seismic velocity and rock density. Having S\| and P\|wave velocities, v p/ v s ratio is calculated for each sub layer. Six sub layers in crust of Tibetan Plateau has been identified, which are 0～8km, 8～30km, 30～40km, 40～62km, 62～68km and 68～75km respectively. The S\|wave velocity structure of the Plateau is 3 13, 3 32, 3 15, 3 92, 3 45 and 3 87 km/s for each sub layer; and P\|wave velocities are 6 00, 6 10, 5 72, 6 35, 6 78 and 6 64km/s respectively v p/ v s ratios in sub layers are 1 92, 1 84, 1 82, 1 62, 1 96 and 1 72; and corresponding Poisson ratios are 0 31, 0 29, 0 28, 0 19, 0 32 and 0 24. Our result on Poisson ratios of Tibetan crust was supported by seismic waveform modelling by Rodgers and Schwartz (1998).展开更多
目的探讨脑室-腹腔(V-P)分流术不同穿刺位置联合同期颅骨修补术在颅脑损伤脑积水患者中的效果及对凝血功能、粒系集落刺激因子(G-CSF)、肿瘤坏死因子-α(TNF-α)的影响。方法回顾性分析2020-06—2022-06晋城市人民医院121例颅脑损伤脑...目的探讨脑室-腹腔(V-P)分流术不同穿刺位置联合同期颅骨修补术在颅脑损伤脑积水患者中的效果及对凝血功能、粒系集落刺激因子(G-CSF)、肿瘤坏死因子-α(TNF-α)的影响。方法回顾性分析2020-06—2022-06晋城市人民医院121例颅脑损伤脑积水患者临床资料,根据手术方案分为A组(n=61)和B组(n=60),分别行V-P分流术(副三角区穿刺)+颅骨修补术、V-P分流术(侧脑室三角区穿刺)+颅骨修补术。统计2组脑积水改善情况、并发症、预后,对比术前、术后凝血功能、G-CSF、TNF-α、脑灌注情况、神经功能评分(NIHSS)。结果A组脑积水改善总有效率81.97%与B组80.00%比较,差异无统计学意义(P>0.05)。术后3 d、7 d A组血清APTT、PT水平低于B组,Fbg水平高于B组(P<0.05)。术后1个月A组血清G-CSF水平高于B组,TNF-α水平低于B组(P<0.05)。术前2组NIHSS评分、ICP、CCP比较,差异无统计学意义(P>0.05),术后1个月、3个月2组NIHSS评分、ICP低于术前,CCP高于术前(P<0.05)。A组并发症发生率(6.56%)低于B组(20.00%,P<0.05)。术后3个月,A组预后优良率(66.67%)与B组(67.24%)比较,差异无统计学意义(P>0.05)。结论V-P分流术不同穿刺位置联合同期颅骨修补术治疗颅脑损伤脑积水疗效相当,特别是副三角区穿刺,可减少并发症,降低血清G-CSF、TNF-α水平,且对凝血功能影响较小。展开更多
In this work, seismic refraction was used to obtain elastic properties (shear modulus (μ), Young modulus (E), Bulk modulus (K) and lithological information in Uyo and its environ as an aid to engineering foundation. ...In this work, seismic refraction was used to obtain elastic properties (shear modulus (μ), Young modulus (E), Bulk modulus (K) and lithological information in Uyo and its environ as an aid to engineering foundation. Using seismic refraction method, the top and weathered layer of the engineering foundation in the study area was investigated to determine the elastic parameters of top soil and also assess the strength of engineering foundation based on the parameter distribution. A 24-channel signal enhancement seismograph, geophones, sledge hammer and a metal plate (source) for generating seismic waves were used. The study area lies between latitudes 4˚45' and 5˚15'N and between longitudes 7˚45' and 8˚30'E in the Niger Delta region of southern Nigeria. Geologically, the area is located in the Tertiary to Quaternary Coastal Plain Sands (CPS) (otherwise called the Benin Formation) and Alluvium environments of the Niger Delta region of southern Nigeria. Shear Modulus had average values of 0.43 × 10<sup>8</sup> N/m<sup>2</sup> and 1.40 × 10<sup>8</sup> N/m<sup>2</sup> for layers 1 and 2 respectively. The average values of the Young Modulus for layers 1 and 2 were determined as 2.32 × 10<sup>8</sup> N/m<sup>2</sup> and 3.84 × 10<sup>8</sup> N/m<sup>2</sup> respectively. The average values of the bulk Modulus for layers 1 and 2 were estimated as 1.52 × 10<sup>8</sup> N/m<sup>2</sup> and 4.93 × 10<sup>8</sup> N/m<sup>2</sup> respectively.展开更多
以西北农林科技大学校园内生长良好的耐旱树种刺槐(R obin ia p seud oacacia L.)、元宝枫(A certrunca tum Bge.)、沙棘(H ipp ophae rham noid es L.)、白榆(U lm us pum ila L.)、油松(P inus tabu laef orm is C arr.)、白皮松(P in...以西北农林科技大学校园内生长良好的耐旱树种刺槐(R obin ia p seud oacacia L.)、元宝枫(A certrunca tum Bge.)、沙棘(H ipp ophae rham noid es L.)、白榆(U lm us pum ila L.)、油松(P inus tabu laef orm is C arr.)、白皮松(P inus bung eana Zucc.ex End l.)及中生树种女贞(L igustrum lucidum A it.)和柳树(S a lix m a tsud ana K o idz.f.p endu la Schne id)为研究对象,用压力套在2.5 M Pa下诱导1年生枝条发生木质部栓塞,研究自然条件下木质部栓塞的恢复特性,探讨木质部栓塞恢复特性与PV曲线水分参数间的关系。结果表明,木质部栓塞恢复的快慢,与其小枝的木质部栓塞脆弱性顺序基本一致;栓塞的发生和恢复与树木木质部的结构密切相关。植物木质部栓塞的发生、恢复,与植物耐旱性一样受多种因素控制,虽然与PV曲线水分参数有一定关系,但任何单一水分参数的排序,均与木质部栓塞的脆弱性和恢复速率不完全一致。木质部水势和树木不同部位间的水势梯度是影响木质部栓塞发生和恢复的最主要因素,蒸腾作用、气孔关闭及植物的渗透调节等可能也与木质部栓塞的恢复有关。展开更多
文摘We estimated crustal v p/ v s ratio of Tibetan Plateau by combined inversion of Love and Rayleigh wave dispersion data. It is developed by us that the joint inversion methods using both Love and Rayleigh wave dispersion data. Thickness and S\|wave velocity of each sub layer are taken from Love wave dispersion data, then P\|wave velocity structure was deduced using Rayleigh wave dispersion data. Densities of sub layers were estimated by the empirical relationships between seismic velocity and rock density. Having S\| and P\|wave velocities, v p/ v s ratio is calculated for each sub layer. Six sub layers in crust of Tibetan Plateau has been identified, which are 0～8km, 8～30km, 30～40km, 40～62km, 62～68km and 68～75km respectively. The S\|wave velocity structure of the Plateau is 3 13, 3 32, 3 15, 3 92, 3 45 and 3 87 km/s for each sub layer; and P\|wave velocities are 6 00, 6 10, 5 72, 6 35, 6 78 and 6 64km/s respectively v p/ v s ratios in sub layers are 1 92, 1 84, 1 82, 1 62, 1 96 and 1 72; and corresponding Poisson ratios are 0 31, 0 29, 0 28, 0 19, 0 32 and 0 24. Our result on Poisson ratios of Tibetan crust was supported by seismic waveform modelling by Rodgers and Schwartz (1998).
文摘目的探讨脑室-腹腔(V-P)分流术不同穿刺位置联合同期颅骨修补术在颅脑损伤脑积水患者中的效果及对凝血功能、粒系集落刺激因子(G-CSF)、肿瘤坏死因子-α(TNF-α)的影响。方法回顾性分析2020-06—2022-06晋城市人民医院121例颅脑损伤脑积水患者临床资料,根据手术方案分为A组(n=61)和B组(n=60),分别行V-P分流术(副三角区穿刺)+颅骨修补术、V-P分流术(侧脑室三角区穿刺)+颅骨修补术。统计2组脑积水改善情况、并发症、预后,对比术前、术后凝血功能、G-CSF、TNF-α、脑灌注情况、神经功能评分(NIHSS)。结果A组脑积水改善总有效率81.97%与B组80.00%比较,差异无统计学意义(P>0.05)。术后3 d、7 d A组血清APTT、PT水平低于B组,Fbg水平高于B组(P<0.05)。术后1个月A组血清G-CSF水平高于B组,TNF-α水平低于B组(P<0.05)。术前2组NIHSS评分、ICP、CCP比较,差异无统计学意义(P>0.05),术后1个月、3个月2组NIHSS评分、ICP低于术前,CCP高于术前(P<0.05)。A组并发症发生率(6.56%)低于B组(20.00%,P<0.05)。术后3个月,A组预后优良率(66.67%)与B组(67.24%)比较,差异无统计学意义(P>0.05)。结论V-P分流术不同穿刺位置联合同期颅骨修补术治疗颅脑损伤脑积水疗效相当,特别是副三角区穿刺,可减少并发症,降低血清G-CSF、TNF-α水平,且对凝血功能影响较小。
文摘In this work, seismic refraction was used to obtain elastic properties (shear modulus (μ), Young modulus (E), Bulk modulus (K) and lithological information in Uyo and its environ as an aid to engineering foundation. Using seismic refraction method, the top and weathered layer of the engineering foundation in the study area was investigated to determine the elastic parameters of top soil and also assess the strength of engineering foundation based on the parameter distribution. A 24-channel signal enhancement seismograph, geophones, sledge hammer and a metal plate (source) for generating seismic waves were used. The study area lies between latitudes 4˚45' and 5˚15'N and between longitudes 7˚45' and 8˚30'E in the Niger Delta region of southern Nigeria. Geologically, the area is located in the Tertiary to Quaternary Coastal Plain Sands (CPS) (otherwise called the Benin Formation) and Alluvium environments of the Niger Delta region of southern Nigeria. Shear Modulus had average values of 0.43 × 10<sup>8</sup> N/m<sup>2</sup> and 1.40 × 10<sup>8</sup> N/m<sup>2</sup> for layers 1 and 2 respectively. The average values of the Young Modulus for layers 1 and 2 were determined as 2.32 × 10<sup>8</sup> N/m<sup>2</sup> and 3.84 × 10<sup>8</sup> N/m<sup>2</sup> respectively. The average values of the bulk Modulus for layers 1 and 2 were estimated as 1.52 × 10<sup>8</sup> N/m<sup>2</sup> and 4.93 × 10<sup>8</sup> N/m<sup>2</sup> respectively.
文摘以西北农林科技大学校园内生长良好的耐旱树种刺槐(R obin ia p seud oacacia L.)、元宝枫(A certrunca tum Bge.)、沙棘(H ipp ophae rham noid es L.)、白榆(U lm us pum ila L.)、油松(P inus tabu laef orm is C arr.)、白皮松(P inus bung eana Zucc.ex End l.)及中生树种女贞(L igustrum lucidum A it.)和柳树(S a lix m a tsud ana K o idz.f.p endu la Schne id)为研究对象,用压力套在2.5 M Pa下诱导1年生枝条发生木质部栓塞,研究自然条件下木质部栓塞的恢复特性,探讨木质部栓塞恢复特性与PV曲线水分参数间的关系。结果表明,木质部栓塞恢复的快慢,与其小枝的木质部栓塞脆弱性顺序基本一致;栓塞的发生和恢复与树木木质部的结构密切相关。植物木质部栓塞的发生、恢复,与植物耐旱性一样受多种因素控制,虽然与PV曲线水分参数有一定关系,但任何单一水分参数的排序,均与木质部栓塞的脆弱性和恢复速率不完全一致。木质部水势和树木不同部位间的水势梯度是影响木质部栓塞发生和恢复的最主要因素,蒸腾作用、气孔关闭及植物的渗透调节等可能也与木质部栓塞的恢复有关。
