Existing“evaluation indicators”are selected and combined to build a model to support the optimization of shale gas horizontal wells.Towards this end,different“weighting methods”,including AHP and the so-called ent...Existing“evaluation indicators”are selected and combined to build a model to support the optimization of shale gas horizontal wells.Towards this end,different“weighting methods”,including AHP and the so-called entropy method,are combined in the frame of the game theory.Using a relevant test case for the implementation of the model,it is shown that the horizontal section of the considered well is in the middle sweet spot area with good physical properties and fracturing ability.In comparison with the FSI(flow scanner Image)gas production profile,the new model seems to display better abilities for the optimization of horizontal wells.展开更多
This paper investigates Q420 dual-angle cross combined section columns under axial and eccentric compression by conducting experiments.The specimen parameters,experimental setup,and test results are presented.It showe...This paper investigates Q420 dual-angle cross combined section columns under axial and eccentric compression by conducting experiments.The specimen parameters,experimental setup,and test results are presented.It showed that local buckling occurred apparently for single internode specimens(λ<35)under axial compression,while overall bending buckling appeared for others,and no torsional buckling occurred.The theoretical formulas on stability factor were derived by the energy approach.Non-linear finite element models considering residual stress were established using ANSYS which were verified by the corresponding experimental results.The parametric study was to evaluate the effects of slenderness ratio(λ),width to thickness ratio of angles(b/t),the number of filled plate(n),load relative eccentricity(e)and the lateral support stiffness on the ultimate strengths of dual-angle cross combined section columns.Based on above analysis,the design equations are proposed by using curve fitting technique.It is shown from comparison between test results,finite element analysis and related specifications that the ultimate strength from theoretical formulas,proposed equations and finite element models are consistent with experiments results.展开更多
Objective: To discuss the effect of combined spinal and epidural anesthesia on the levels of pain media, stress indicators and inflammatory factors in patients undergoing high altitude cesarean section. Methods: Eight...Objective: To discuss the effect of combined spinal and epidural anesthesia on the levels of pain media, stress indicators and inflammatory factors in patients undergoing high altitude cesarean section. Methods: Eighty patients who underwent cesarean section in our hospital from January 2017 to April 2019 were enrolled in the hospital. They were divided into two groups according to the patient's anesthesia. Fourty patients receiving epidural anesthesia were included in the control group, and another 40 patients received lumbar stiffness. The combined anesthesia patient was included in the observation group. Changes in pain mediators [Serum neuropeptide Y (NPY), endorphin (β-EP), substance P (SP)], stress indicators [Serum cortisol (Cor), C-peptide (C-P), advanced oxidative protein product (AOPP)], inflammatory factor levels [Hypersensitive C-reactive protein (hs-CRP), tumor necrosis factor-alpha (TNF-α)], and immunoglobulin levels [Serum IgA, IgG, IgM] were compared between the two groups. Results: Before anesthesia, there were no significant difference in pain media, stress index, inflammatory factor level and immunoglobulin level between the two groups (P>0.05). At 12 h after operation, the two groups of patients were NPY, β-EP, SP, Cor. The levels of C-P, AOPP, hs-CRP and TNF-α were higher than those before operation (P<0.05). The levels of IgA, IgG and IgM were lower than those before operation (P<0.05). Among them, observation group NPY, β-EP, SP, Cor, C-P, AOPP, hs-CRP and TNF-α were significantly lower than those of the control group (P<0.05). The serum levels of IgA, IgG and IgM were significantly higher than those of the control group (P<0.05). Conclusion: Combined spinal and epidural anesthesia can more effectively alleviate maternal pain in high altitude cesarean section, more effectively reduce the inflammatory stress response of patients, promote the humoral immune function of patients, and is beneficial to the early recovery of maternal postoperative, and has high clinical value.展开更多
目的:探究间羟胺联合腰硬联合麻醉对剖宫产产妇的影响。方法:选取2021年1月—2022年10月泉州市第一医院收治的100例待剖宫产产妇。根据随机数表法将其分为腰硬联合麻醉组和联合治疗组,各50例。腰硬联合麻醉组给予腰硬联合麻醉,联合治疗...目的:探究间羟胺联合腰硬联合麻醉对剖宫产产妇的影响。方法:选取2021年1月—2022年10月泉州市第一医院收治的100例待剖宫产产妇。根据随机数表法将其分为腰硬联合麻醉组和联合治疗组,各50例。腰硬联合麻醉组给予腰硬联合麻醉,联合治疗组给予间羟胺联合腰硬联合麻醉。比较两组麻醉前、术后收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)、心输出量(CO)、心率(HR)、心脏指数(CI),手术指标,新生儿缺氧情况及不良反应。结果:术后,两组DBP、SBP、MAP下降,但联合治疗组DBP、SBP、MAP均高于腰硬联合麻醉组,差异有统计学意义(P<0.05)。术后,两组HR、CO、CI均降低,但联合治疗组HR、CO、CI均高于腰硬联合麻醉组,差异有统计学意义(P<0.05)。两组手术时间、术中失血量、术中液体输注量比较,差异无统计学意义(P>0.05)。两组新生儿1 min和5 min Apgar评分比较,差异无统计学意义(P>0.05)。联合治疗组不良反应发生率低于腰硬联合麻醉组,差异有统计学意义(P<0.05)。结论:间羟胺联合腰硬联合麻醉对剖宫产产妇进行干预,能较好地维护产妇血压、心率水平,调节产妇血流动力学,对新生儿Apgar评分有较小的影响,效果显著。展开更多
基金supported by the National Science and Technology Major Project during the 13th Five-Year Plan under grant(2016ZX05060-019)the National Science and Technology Major Project during the 13th Five-Year Plan under grant(2016ZX05060004).
文摘Existing“evaluation indicators”are selected and combined to build a model to support the optimization of shale gas horizontal wells.Towards this end,different“weighting methods”,including AHP and the so-called entropy method,are combined in the frame of the game theory.Using a relevant test case for the implementation of the model,it is shown that the horizontal section of the considered well is in the middle sweet spot area with good physical properties and fracturing ability.In comparison with the FSI(flow scanner Image)gas production profile,the new model seems to display better abilities for the optimization of horizontal wells.
文摘This paper investigates Q420 dual-angle cross combined section columns under axial and eccentric compression by conducting experiments.The specimen parameters,experimental setup,and test results are presented.It showed that local buckling occurred apparently for single internode specimens(λ<35)under axial compression,while overall bending buckling appeared for others,and no torsional buckling occurred.The theoretical formulas on stability factor were derived by the energy approach.Non-linear finite element models considering residual stress were established using ANSYS which were verified by the corresponding experimental results.The parametric study was to evaluate the effects of slenderness ratio(λ),width to thickness ratio of angles(b/t),the number of filled plate(n),load relative eccentricity(e)and the lateral support stiffness on the ultimate strengths of dual-angle cross combined section columns.Based on above analysis,the design equations are proposed by using curve fitting technique.It is shown from comparison between test results,finite element analysis and related specifications that the ultimate strength from theoretical formulas,proposed equations and finite element models are consistent with experiments results.
基金supported by Scientific Project of Sichuan Hygiene and Family Planning Committee(No.18PJ169).
文摘Objective: To discuss the effect of combined spinal and epidural anesthesia on the levels of pain media, stress indicators and inflammatory factors in patients undergoing high altitude cesarean section. Methods: Eighty patients who underwent cesarean section in our hospital from January 2017 to April 2019 were enrolled in the hospital. They were divided into two groups according to the patient's anesthesia. Fourty patients receiving epidural anesthesia were included in the control group, and another 40 patients received lumbar stiffness. The combined anesthesia patient was included in the observation group. Changes in pain mediators [Serum neuropeptide Y (NPY), endorphin (β-EP), substance P (SP)], stress indicators [Serum cortisol (Cor), C-peptide (C-P), advanced oxidative protein product (AOPP)], inflammatory factor levels [Hypersensitive C-reactive protein (hs-CRP), tumor necrosis factor-alpha (TNF-α)], and immunoglobulin levels [Serum IgA, IgG, IgM] were compared between the two groups. Results: Before anesthesia, there were no significant difference in pain media, stress index, inflammatory factor level and immunoglobulin level between the two groups (P>0.05). At 12 h after operation, the two groups of patients were NPY, β-EP, SP, Cor. The levels of C-P, AOPP, hs-CRP and TNF-α were higher than those before operation (P<0.05). The levels of IgA, IgG and IgM were lower than those before operation (P<0.05). Among them, observation group NPY, β-EP, SP, Cor, C-P, AOPP, hs-CRP and TNF-α were significantly lower than those of the control group (P<0.05). The serum levels of IgA, IgG and IgM were significantly higher than those of the control group (P<0.05). Conclusion: Combined spinal and epidural anesthesia can more effectively alleviate maternal pain in high altitude cesarean section, more effectively reduce the inflammatory stress response of patients, promote the humoral immune function of patients, and is beneficial to the early recovery of maternal postoperative, and has high clinical value.
文摘目的:探究间羟胺联合腰硬联合麻醉对剖宫产产妇的影响。方法:选取2021年1月—2022年10月泉州市第一医院收治的100例待剖宫产产妇。根据随机数表法将其分为腰硬联合麻醉组和联合治疗组,各50例。腰硬联合麻醉组给予腰硬联合麻醉,联合治疗组给予间羟胺联合腰硬联合麻醉。比较两组麻醉前、术后收缩压(SBP)、舒张压(DBP)、平均动脉压(MAP)、心输出量(CO)、心率(HR)、心脏指数(CI),手术指标,新生儿缺氧情况及不良反应。结果:术后,两组DBP、SBP、MAP下降,但联合治疗组DBP、SBP、MAP均高于腰硬联合麻醉组,差异有统计学意义(P<0.05)。术后,两组HR、CO、CI均降低,但联合治疗组HR、CO、CI均高于腰硬联合麻醉组,差异有统计学意义(P<0.05)。两组手术时间、术中失血量、术中液体输注量比较,差异无统计学意义(P>0.05)。两组新生儿1 min和5 min Apgar评分比较,差异无统计学意义(P>0.05)。联合治疗组不良反应发生率低于腰硬联合麻醉组,差异有统计学意义(P<0.05)。结论:间羟胺联合腰硬联合麻醉对剖宫产产妇进行干预,能较好地维护产妇血压、心率水平,调节产妇血流动力学,对新生儿Apgar评分有较小的影响,效果显著。
