S)-3-Hydroxy-g-butyrolactone was synthesized from L-malic acid by anhydridisation, mono-esterification, and reductive cyclization by NaBH4 and with an overall yield of 79%.
目的观察"护心口服液"治疗气阴两虚型心律失常的临床疗效。方法将80例患者随机分为治疗组和对照组,对照组予稳心颗粒5 g Tid口服,治疗组予护心口服液10ml Tid口服,疗程均为28天。观察两组治疗前后心律失常发作情况、中医证候...目的观察"护心口服液"治疗气阴两虚型心律失常的临床疗效。方法将80例患者随机分为治疗组和对照组,对照组予稳心颗粒5 g Tid口服,治疗组予护心口服液10ml Tid口服,疗程均为28天。观察两组治疗前后心律失常发作情况、中医证候积分及24小时心电图变化情况。结果治疗组临床总有效率为88.10%,较对照组的71.05%更好;治疗组心悸总有效率为90.48%,与对照组的78.95%相当;治疗组动态心电图总有效率为83.33%,与对照组的78.95%相当。两组中医证候积分均显著降低,治疗组降低幅度大于对照组。两组治疗后均未见明显不良反应。结论护心口服液治疗气阴两虚型心律失常疗效确切,并能明显改善中医临床症状,且无明显不良反应。展开更多
The subway is the primary travel tool for urban residents in China. Due to the complex structure of the subway and high personnel density in rush hours, subway evacuation capacity is critical. The subway evacuation mo...The subway is the primary travel tool for urban residents in China. Due to the complex structure of the subway and high personnel density in rush hours, subway evacuation capacity is critical. The subway evacuation model is explored in this work by combining the improved social force model with the view radius using the Vicsek model. The pedestrians are divided into two categories based on different force models. The first category is sensitive pedestrians who have normal responses to emergency signs. The second category is insensitive pedestrians. By simulating different proportions of the insensitive pedestrians, we find that the escape time is directly proportional to the number of insensitive pedestrians and inversely proportional to the view radius. However, when the view radius is large enough, the escape time does not change significantly, and the evacuation of people in a small view radius environment tends to be integrated. With the improvement of view radius conditions, the escape time changes more obviously with the proportion of insensitive pedestrians. A new emergency sign layout is proposed, and the simulations show that the proposed layout can effectively reduce the escape time in a small view radius environment. However, the evacuation effect of the new escape sign layout on the large view radius environment is not apparent. In this case, the exit setting emerges as an additional factor affecting the escape time.展开更多
文摘S)-3-Hydroxy-g-butyrolactone was synthesized from L-malic acid by anhydridisation, mono-esterification, and reductive cyclization by NaBH4 and with an overall yield of 79%.
文摘目的观察"护心口服液"治疗气阴两虚型心律失常的临床疗效。方法将80例患者随机分为治疗组和对照组,对照组予稳心颗粒5 g Tid口服,治疗组予护心口服液10ml Tid口服,疗程均为28天。观察两组治疗前后心律失常发作情况、中医证候积分及24小时心电图变化情况。结果治疗组临床总有效率为88.10%,较对照组的71.05%更好;治疗组心悸总有效率为90.48%,与对照组的78.95%相当;治疗组动态心电图总有效率为83.33%,与对照组的78.95%相当。两组中医证候积分均显著降低,治疗组降低幅度大于对照组。两组治疗后均未见明显不良反应。结论护心口服液治疗气阴两虚型心律失常疗效确切,并能明显改善中医临床症状,且无明显不良反应。
基金supported by the National Natural Science Foundation of China (Grant Nos. 51874183 and 51874182)the National Key Research and Development Program of China (Grant No. 2018YFC0809300)。
文摘The subway is the primary travel tool for urban residents in China. Due to the complex structure of the subway and high personnel density in rush hours, subway evacuation capacity is critical. The subway evacuation model is explored in this work by combining the improved social force model with the view radius using the Vicsek model. The pedestrians are divided into two categories based on different force models. The first category is sensitive pedestrians who have normal responses to emergency signs. The second category is insensitive pedestrians. By simulating different proportions of the insensitive pedestrians, we find that the escape time is directly proportional to the number of insensitive pedestrians and inversely proportional to the view radius. However, when the view radius is large enough, the escape time does not change significantly, and the evacuation of people in a small view radius environment tends to be integrated. With the improvement of view radius conditions, the escape time changes more obviously with the proportion of insensitive pedestrians. A new emergency sign layout is proposed, and the simulations show that the proposed layout can effectively reduce the escape time in a small view radius environment. However, the evacuation effect of the new escape sign layout on the large view radius environment is not apparent. In this case, the exit setting emerges as an additional factor affecting the escape time.
