以新疆乌尔禾天然岩沥青作为改性剂,通过对岩沥青改性沥青的性能试验,确定乌尔禾岩沥青改善塔河90A沥青俱佳的搅拌时间和溶入温度,为使乌尔禾岩沥青在道路沥青改性方面的推广应用,提供理论依据。本研究的目的是研究试验参数对乌尔禾岩...以新疆乌尔禾天然岩沥青作为改性剂,通过对岩沥青改性沥青的性能试验,确定乌尔禾岩沥青改善塔河90A沥青俱佳的搅拌时间和溶入温度,为使乌尔禾岩沥青在道路沥青改性方面的推广应用,提供理论依据。本研究的目的是研究试验参数对乌尔禾岩沥青改性沥青路用性能改善效果的影响,为岩沥青改性沥青施工工艺的确定提供依据。研究中进行了乌尔禾岩沥青改性塔河90A沥青的不同搅拌时间和不同溶入温度的针入度、软化点、延度和粘度的性能试验,试验结果表明,融入温度和搅拌时间的不同会使改性沥青性能影响程度不同,产生改性效果的优劣。结果得出,新疆乌尔禾岩沥青改性塔河90A沥青的最佳搅拌时间为25 m in,最佳融入温度为150℃。展开更多
目的对腹部手术全麻苏醒期躁动的相关因素进行分析,筛选出独立危险因素。方法观察腹部手术术后患者意识恢复情况,记录患者性别、年龄、体重、疾病类别、术前睡眠时间、麻醉时间、吸入麻醉用量、吸入麻醉停用时间、术中输液量、输血量、...目的对腹部手术全麻苏醒期躁动的相关因素进行分析,筛选出独立危险因素。方法观察腹部手术术后患者意识恢复情况,记录患者性别、年龄、体重、疾病类别、术前睡眠时间、麻醉时间、吸入麻醉用量、吸入麻醉停用时间、术中输液量、输血量、失血量、尿量。用Logistic回归分析研究影响全麻苏醒期躁动的相关因素。结果共有142例患者纳入分析,全麻苏醒期躁动发生率17.61%。年龄(B=-0.059,P=0.007,OR=0.943,95%CI of OR:0.902～0.986)和术前睡眠时间(B=-0.786,P=0.000,OR=0.455,95%CI of OR:0.317～0.655)对全麻苏醒期躁动具有显著影响。结论年龄和术前睡眠时间是影响腹部手术患者全麻苏醒期躁动的独立危险因素。展开更多
The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computatio...The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics（CFD） software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade-Rushton-turbines（6-DT） are predicted using the detached eddy simulation（DES） method. A sliding mesh（SM） approach is adopted to solve the rotation of the impeller. The simulated flow patterns and liquid velocities in the agitated tank are verified by experimental data in the literature. The simulation results indicate that the DES method can obtain more flow details than Reynolds-averaged Navier-Stokes（RANS） model. Local and global mixing time in the agitated tank is predicted by solving a tracer concentration scalar transport equation. The simulated results show that feeding points have great influence on mixing process and mixing time. Mixing efficiency is the highest for the feeding point at location of midway of the two impellers. Two methods are used to determine global mixing time and get close result. Dimensionless global mixing time remains unchanged with increasing of impeller speed. Parallel, merging and diverging flow pattern form in the agitated tank, respectively, by changing the impeller spacing and clearance of lower impeller from the bottom of the tank. The global mixing time is the shortest for the merging flow, followed by diverging flow, and the longest for parallel flow. The research presents helpful references for design, optimization and scale-up of agitated tanks with multi-impeller.展开更多
文摘以新疆乌尔禾天然岩沥青作为改性剂,通过对岩沥青改性沥青的性能试验,确定乌尔禾岩沥青改善塔河90A沥青俱佳的搅拌时间和溶入温度,为使乌尔禾岩沥青在道路沥青改性方面的推广应用,提供理论依据。本研究的目的是研究试验参数对乌尔禾岩沥青改性沥青路用性能改善效果的影响,为岩沥青改性沥青施工工艺的确定提供依据。研究中进行了乌尔禾岩沥青改性塔河90A沥青的不同搅拌时间和不同溶入温度的针入度、软化点、延度和粘度的性能试验,试验结果表明,融入温度和搅拌时间的不同会使改性沥青性能影响程度不同,产生改性效果的优劣。结果得出,新疆乌尔禾岩沥青改性塔河90A沥青的最佳搅拌时间为25 m in,最佳融入温度为150℃。
基金supported by the National Natural Science Foundation of China(51072043)National Key Basic Research Program of China(973)(2011CBA00700)+2 种基金Anhui Province Science and Technology Plan Project of China(2010AKND0794)College Natural Science Foundation of AnhuiProvince,China(KJ2010A266)Undergraduate Innovation Fund of Hefei University of Technology,China(cxsy102084)~~
文摘目的对腹部手术全麻苏醒期躁动的相关因素进行分析,筛选出独立危险因素。方法观察腹部手术术后患者意识恢复情况,记录患者性别、年龄、体重、疾病类别、术前睡眠时间、麻醉时间、吸入麻醉用量、吸入麻醉停用时间、术中输液量、输血量、失血量、尿量。用Logistic回归分析研究影响全麻苏醒期躁动的相关因素。结果共有142例患者纳入分析,全麻苏醒期躁动发生率17.61%。年龄(B=-0.059,P=0.007,OR=0.943,95%CI of OR:0.902～0.986)和术前睡眠时间(B=-0.786,P=0.000,OR=0.455,95%CI of OR:0.317～0.655)对全麻苏醒期躁动具有显著影响。结论年龄和术前睡眠时间是影响腹部手术患者全麻苏醒期躁动的独立危险因素。
基金Supported by Key Scientific Research Project of Sichuan Provincial Education Department(Grant No.15ZA0107)Doctor Foundation of Southwest University of Science and Technology(Grant No.11zx7162)
文摘The Issue of mixing efficiency in agitated tanks has drawn serious concern in many industrial processes. The turbulence model is very critical to predicting mixing process in agitated tanks. On the basis of computational fluid dynamics（CFD） software package Fluent 6.2, the mixing characteristics in a tank agitated by dual six-blade-Rushton-turbines（6-DT） are predicted using the detached eddy simulation（DES） method. A sliding mesh（SM） approach is adopted to solve the rotation of the impeller. The simulated flow patterns and liquid velocities in the agitated tank are verified by experimental data in the literature. The simulation results indicate that the DES method can obtain more flow details than Reynolds-averaged Navier-Stokes（RANS） model. Local and global mixing time in the agitated tank is predicted by solving a tracer concentration scalar transport equation. The simulated results show that feeding points have great influence on mixing process and mixing time. Mixing efficiency is the highest for the feeding point at location of midway of the two impellers. Two methods are used to determine global mixing time and get close result. Dimensionless global mixing time remains unchanged with increasing of impeller speed. Parallel, merging and diverging flow pattern form in the agitated tank, respectively, by changing the impeller spacing and clearance of lower impeller from the bottom of the tank. The global mixing time is the shortest for the merging flow, followed by diverging flow, and the longest for parallel flow. The research presents helpful references for design, optimization and scale-up of agitated tanks with multi-impeller.
