To describe properties of the high frequency gravitational wave （HFGW） propagating through the vacuum gravitational field in Robertson-Walker background space-time, we calculated its energy momentum pseudo-tensor （...To describe properties of the high frequency gravitational wave （HFGW） propagating through the vacuum gravitational field in Robertson-Walker background space-time, we calculated its energy momentum pseudo-tensor （EMPT） in the limit of short wavelengths by taking the Brill-Hartle average on the second order perturbation of the Einstein tensor over several wavelengths. By rewriting the EMPT as a form of perfect fluid, the dynamical back-reaction of HIFGW on the background spacetime was discussed. The result shows that the energy density of HFGW, which is in the gauge we chose, is positive definite. The HFGW serves as a source for curving the background space-time and affects the dynamical evolution and time evolution of the scale factor of the Robertson-Walker metric.展开更多
The temperature of evaporating black holes is usually calculated with a two-dimensional model with the back-reaction effects considered. The following relation which is valid in a static or a stationary space-time is ...The temperature of evaporating black holes is usually calculated with a two-dimensional model with the back-reaction effects considered. The following relation which is valid in a static or a stationary space-time is generalized to a non-static and non-stationary展开更多
[目的]基于“以俞调枢”理论探讨艾灸背俞穴预防恶性肿瘤患者化疗相关性恶心呕吐(chemotherapy-induced nausea and vomiting,CINV)的临床疗效。[方法]选取浙江中医药大学附属第一医院2021年9月至2023年12月接受化疗的恶性肿瘤患者94例...[目的]基于“以俞调枢”理论探讨艾灸背俞穴预防恶性肿瘤患者化疗相关性恶心呕吐(chemotherapy-induced nausea and vomiting,CINV)的临床疗效。[方法]选取浙江中医药大学附属第一医院2021年9月至2023年12月接受化疗的恶性肿瘤患者94例,通过随机数字表法分为试验组和对照组,每组各47例。对照组患者接受常规治疗及护理,试验组在常规治疗护理的基础上接受艾灸背俞穴治疗。比较两组患者在化疗后第1~5天、第7天及第14天恶心、呕吐发生率,以及化疗相关药物不良反应(便秘、头痛、疲乏、嗜睡)的发生率。[结果]化疗后第1~2天,试验组恶心发生率低于对照组,但差异无统计学意义(P>0.05);而化疗后第3~5天及第7天,试验组的恶心发生率显著低于对照组(P<0.05)。化疗后第2~5天及第7天,试验组的呕吐发生率亦低于对照组(P<0.05)。试验组化疗相关不良反应便秘、头痛、疲乏及嗜睡等发生率分别为23.4%、4.3%、34.0%和10.6%,均低于对照组,差异有统计学意义(P<0.05)。[结论]艾灸背俞穴可作为辅助治疗,降低恶性肿瘤患者化疗过程中恶心呕吐症状的发生率,同时也能减轻由化疗相关药物引起的其他不良反应。展开更多
Using Damour-Ruflini＇s method, Hawking radiation from a general stationary black hole is investigated again deeply. Considering the back reaction of the particle to the space-time and energy conservation, we find tha...Using Damour-Ruflini＇s method, Hawking radiation from a general stationary black hole is investigated again deeply. Considering the back reaction of the particle to the space-time and energy conservation, we find that the radiation is not exactly thermal and can take out information from the black hole. This can be used to explain the information loss paradox, and the result is consistent with the works finished before.展开更多
基金the National Basic Research Program of China (No.2003 CB 716300)the National Natural Science Foundation of China (No.10575140)+1 种基金the Nature Science Foundation of Chongqing (No. 8562)the Foundation of China Academy of Engineering Physics.
文摘To describe properties of the high frequency gravitational wave （HFGW） propagating through the vacuum gravitational field in Robertson-Walker background space-time, we calculated its energy momentum pseudo-tensor （EMPT） in the limit of short wavelengths by taking the Brill-Hartle average on the second order perturbation of the Einstein tensor over several wavelengths. By rewriting the EMPT as a form of perfect fluid, the dynamical back-reaction of HIFGW on the background spacetime was discussed. The result shows that the energy density of HFGW, which is in the gauge we chose, is positive definite. The HFGW serves as a source for curving the background space-time and affects the dynamical evolution and time evolution of the scale factor of the Robertson-Walker metric.
基金Project supported by the National Natural Science Foundation of China
文摘The temperature of evaporating black holes is usually calculated with a two-dimensional model with the back-reaction effects considered. The following relation which is valid in a static or a stationary space-time is generalized to a non-static and non-stationary
文摘[目的]基于“以俞调枢”理论探讨艾灸背俞穴预防恶性肿瘤患者化疗相关性恶心呕吐(chemotherapy-induced nausea and vomiting,CINV)的临床疗效。[方法]选取浙江中医药大学附属第一医院2021年9月至2023年12月接受化疗的恶性肿瘤患者94例,通过随机数字表法分为试验组和对照组,每组各47例。对照组患者接受常规治疗及护理,试验组在常规治疗护理的基础上接受艾灸背俞穴治疗。比较两组患者在化疗后第1~5天、第7天及第14天恶心、呕吐发生率,以及化疗相关药物不良反应(便秘、头痛、疲乏、嗜睡)的发生率。[结果]化疗后第1~2天,试验组恶心发生率低于对照组,但差异无统计学意义(P>0.05);而化疗后第3~5天及第7天,试验组的恶心发生率显著低于对照组(P<0.05)。化疗后第2~5天及第7天,试验组的呕吐发生率亦低于对照组(P<0.05)。试验组化疗相关不良反应便秘、头痛、疲乏及嗜睡等发生率分别为23.4%、4.3%、34.0%和10.6%,均低于对照组,差异有统计学意义(P<0.05)。[结论]艾灸背俞穴可作为辅助治疗,降低恶性肿瘤患者化疗过程中恶心呕吐症状的发生率,同时也能减轻由化疗相关药物引起的其他不良反应。
基金the National Basic Research Program of China under Grant No.2003CB716302the National Natural Science Foundation of China under Grant No.10773002
文摘Using Damour-Ruflini＇s method, Hawking radiation from a general stationary black hole is investigated again deeply. Considering the back reaction of the particle to the space-time and energy conservation, we find that the radiation is not exactly thermal and can take out information from the black hole. This can be used to explain the information loss paradox, and the result is consistent with the works finished before.
