目的探讨安宫牛黄丸辅助再灌注治疗重症急性缺血性卒中(AIS)的疗效。方法回顾性选取2021年5月至2023年5月绍兴市人民医院收治的60例再灌注治疗时间窗内重症AIS患者为研究对象,采用安宫牛黄丸辅助再灌注治疗30例,为观察组;采用单纯再灌...目的探讨安宫牛黄丸辅助再灌注治疗重症急性缺血性卒中(AIS)的疗效。方法回顾性选取2021年5月至2023年5月绍兴市人民医院收治的60例再灌注治疗时间窗内重症AIS患者为研究对象,采用安宫牛黄丸辅助再灌注治疗30例,为观察组;采用单纯再灌注治疗30例,为对照组。观察并比较两组患者治疗后病情及神经功能指标[包括美国国立卫生研究院卒中量表(NIHSS)、格拉斯哥昏迷量表(GCS)、改良Rankin量表(mRS)评分以及梗死后加重、梗死后出血、脑疝、神经功能恢复、治疗期间2周内死亡比例]、炎症指标[包括C反应蛋白(CRP)、中性粒细胞与淋巴细胞比值(NLR)、血小板与淋巴细胞比值(PLR)、全身免疫炎症指数(SII)]等。结果观察组患者在90 d NIHSS评分,14、30 d GCS评分,90 d mRS评分以及神经功能恢复比例方面均优于对照组(均P<0.05)。两组患者治疗前后CRP、NLR、PLR、SII等炎症指标比较,差异均无统计学意义(均P>0.05)。结论安宫牛黄丸辅助再灌注治疗AIS有助于促进患者早期意识的恢复和远期神经功能缺损的改善,但对炎症指标影响不大。展开更多
The combustion chamber is an important component for the Stifling engine heated by natural gas. In the paper, we develop a combustion chamber for the Stifling engine which aims to generate 3-5 kWe electric power. The ...The combustion chamber is an important component for the Stifling engine heated by natural gas. In the paper, we develop a combustion chamber for the Stifling engine which aims to generate 3-5 kWe electric power. The combustion chamber includes three main components： combustion module, heat exchange cavity and thermal head. Its feature is that the structure can divide ＂combustion＂ process and ＂heat transfer＂ process into two appar- ent individual steps and make them happen one by one. Since natural gas can mix with air fully before burning, the combustion process can be easily completed without the second wind. The flame can avoid contacting the thermal head of Stifling engine, and the temperature fields can be easily controlled. The designed combustion chamber is manufactured and its performance is tested by an experiment which includes two steps. The experi- mental result of the first step proves that the mixture of air and natural gas can be easily ignited and the flame burns stably. In the second step of experiment, the combustion heat flux can reach 20 kW, and the energy utiliza- tion efficiency of thermal head has exceeded 0.5. These test results show that the thermal performance of com- bustion chamber has reached the design goal, The designed combustion chamber can be applied to a real Stifling engine heated by natural gas which is to generate 3-5 kWe electric power.展开更多
Based on theoretical analysis of PCM(Phase Change Material) solidification process, the model of improved void cavity distribution tending to high temperature region is established. Numerical results are compared with...Based on theoretical analysis of PCM(Phase Change Material) solidification process, the model of improved void cavity distribution tending to high temperature region is established. Numerical results are compared with NASA(National Aeronautics and Space Administration) results. Analysis results show that the outer wall temperature, the melting ratio of PCM and the temperature gradient of PCM canister, have great difference in different void cavity distribution. The form of void distribution has a great effect on the process of phase change. Based on simulation results under the model of improved void cavity distribution, phase change heat transfer process in thermal storage container is analyzed. The main goal of the improved designing for PCM canister is to take measures in reducing the concentration distribution of void cavity by adding some foam metal into phase change material.展开更多
The inlet temperatures of gas turbines are generally increasing over time,so conventional cooling methods are likely to approach their useful limits.It is therefore essential to investigate novel cooling methods.Based...The inlet temperatures of gas turbines are generally increasing over time,so conventional cooling methods are likely to approach their useful limits.It is therefore essential to investigate novel cooling methods.Based on the theory of heat transfer enhancement,a novel film cooling method for gas turbine blades using a chemical heat sink is proposed.In this method,the endothermic reaction of an NH 3 cooling stream heated by the main gas stream takes place,reducing the convective heat transfer between the mainstream and the blades.Therefore,film cooling effectiveness is improved.To test the feasibility of the proposed method,numerical simulations were conducted,using the classical flat plate with a 30 degree angled cylindrical hole(diameter,D).Film cooling effectiveness at different blowing ratios(M = 0.5,1.0,and 1.5) were computed and compared with the results of conventional cooling methods.The simulation results show that the proposed method can enhance film cooling effectiveness not only in the stream-wise direction,but also in the span-wise direction.The span-averaged film effectiveness is improved in the presence of a chemical heat sink,with the value of X/D(the ratio of downstream distance from the center of the film hole to the diameter of the film hole) increasing downstream of the film hole.The novel film cooling approach showed the best performance at M = 0.5.展开更多
文摘目的探讨安宫牛黄丸辅助再灌注治疗重症急性缺血性卒中(AIS)的疗效。方法回顾性选取2021年5月至2023年5月绍兴市人民医院收治的60例再灌注治疗时间窗内重症AIS患者为研究对象,采用安宫牛黄丸辅助再灌注治疗30例,为观察组;采用单纯再灌注治疗30例,为对照组。观察并比较两组患者治疗后病情及神经功能指标[包括美国国立卫生研究院卒中量表(NIHSS)、格拉斯哥昏迷量表(GCS)、改良Rankin量表(mRS)评分以及梗死后加重、梗死后出血、脑疝、神经功能恢复、治疗期间2周内死亡比例]、炎症指标[包括C反应蛋白(CRP)、中性粒细胞与淋巴细胞比值(NLR)、血小板与淋巴细胞比值(PLR)、全身免疫炎症指数(SII)]等。结果观察组患者在90 d NIHSS评分,14、30 d GCS评分,90 d mRS评分以及神经功能恢复比例方面均优于对照组(均P<0.05)。两组患者治疗前后CRP、NLR、PLR、SII等炎症指标比较,差异均无统计学意义(均P>0.05)。结论安宫牛黄丸辅助再灌注治疗AIS有助于促进患者早期意识的恢复和远期神经功能缺损的改善,但对炎症指标影响不大。
基金supported by the National Natural Science Foundation of China(Grant No.51161140332)
文摘The combustion chamber is an important component for the Stifling engine heated by natural gas. In the paper, we develop a combustion chamber for the Stifling engine which aims to generate 3-5 kWe electric power. The combustion chamber includes three main components： combustion module, heat exchange cavity and thermal head. Its feature is that the structure can divide ＂combustion＂ process and ＂heat transfer＂ process into two appar- ent individual steps and make them happen one by one. Since natural gas can mix with air fully before burning, the combustion process can be easily completed without the second wind. The flame can avoid contacting the thermal head of Stifling engine, and the temperature fields can be easily controlled. The designed combustion chamber is manufactured and its performance is tested by an experiment which includes two steps. The experi- mental result of the first step proves that the mixture of air and natural gas can be easily ignited and the flame burns stably. In the second step of experiment, the combustion heat flux can reach 20 kW, and the energy utiliza- tion efficiency of thermal head has exceeded 0.5. These test results show that the thermal performance of com- bustion chamber has reached the design goal, The designed combustion chamber can be applied to a real Stifling engine heated by natural gas which is to generate 3-5 kWe electric power.
基金financially supported by National Natural Science Foundation of China(Grant No.51476172)
文摘Based on theoretical analysis of PCM(Phase Change Material) solidification process, the model of improved void cavity distribution tending to high temperature region is established. Numerical results are compared with NASA(National Aeronautics and Space Administration) results. Analysis results show that the outer wall temperature, the melting ratio of PCM and the temperature gradient of PCM canister, have great difference in different void cavity distribution. The form of void distribution has a great effect on the process of phase change. Based on simulation results under the model of improved void cavity distribution, phase change heat transfer process in thermal storage container is analyzed. The main goal of the improved designing for PCM canister is to take measures in reducing the concentration distribution of void cavity by adding some foam metal into phase change material.
基金supported by the National Natural Science Foundation of China (50976118)the National Basic Research Program of China(2010CB227302)
文摘The inlet temperatures of gas turbines are generally increasing over time,so conventional cooling methods are likely to approach their useful limits.It is therefore essential to investigate novel cooling methods.Based on the theory of heat transfer enhancement,a novel film cooling method for gas turbine blades using a chemical heat sink is proposed.In this method,the endothermic reaction of an NH 3 cooling stream heated by the main gas stream takes place,reducing the convective heat transfer between the mainstream and the blades.Therefore,film cooling effectiveness is improved.To test the feasibility of the proposed method,numerical simulations were conducted,using the classical flat plate with a 30 degree angled cylindrical hole(diameter,D).Film cooling effectiveness at different blowing ratios(M = 0.5,1.0,and 1.5) were computed and compared with the results of conventional cooling methods.The simulation results show that the proposed method can enhance film cooling effectiveness not only in the stream-wise direction,but also in the span-wise direction.The span-averaged film effectiveness is improved in the presence of a chemical heat sink,with the value of X/D(the ratio of downstream distance from the center of the film hole to the diameter of the film hole) increasing downstream of the film hole.The novel film cooling approach showed the best performance at M = 0.5.
