Objective:To explore the effect of fragmented case teaching in the standardized training of residents in anesthesiology department.Methods:80 doctors who participated in the standardized training of residents in anest...Objective:To explore the effect of fragmented case teaching in the standardized training of residents in anesthesiology department.Methods:80 doctors who participated in the standardized training of residents in anesthesiology department from January 2021 to January 2022 were selected as the research objects,and the 80 doctors were divided into experimental groups according to the clinical teaching mode(n=40,implemented case fragmented teaching method)and the control group(n=40,traditional teaching method).The training lasted for 2 months,and the medical history collection,medical record analysis,practical operation ability,theoretical assessment results,and the degree of satisfaction towards the training of the two groups of doctors were compared.Results:After 2 months of training,the theoretical knowledge and operational ability of the doctors in the two groups have improved to a certain extent,but the medical history collection,medical record analysis,practical operation ability,theoretical assessment results and satisfaction of the doctors in the experimental group were significantly better than those in the control group(P<0.05).Conclusion:The effect of the fragmented case teaching method in the standardized training of anesthesiology residents is significantly better than the traditional teaching mode.The abilities of doctors have significantly improved after the training.Hence,the fragmented case teaching method is worthy of promotion in clinical practice.展开更多
It has been said that,once a bomb casing has fractured, "detonation gases will then stream around the fragments or bypass them,and the acceleration process stops there." However,while apparently copious gas ...It has been said that,once a bomb casing has fractured, "detonation gases will then stream around the fragments or bypass them,and the acceleration process stops there." However,while apparently copious gas flow through casing fractures indicates some pressure release,it is also an indication of significant gas drive pressure,post casing fracture.This paper shows two approaches to the problem of calculating the actual loss of drive.One presents first-order analytical calculations,in cylindrical geometry,of pressure loss to the inside surface of a fractured casing.The second shows the modelling of a selected example in the CTH code.Both approaches reveal that gas escape,while occurring at its own soundspeed relative to the adjacent casing fragments,has to compete with rapid radial expansion of the casing.Together with some historic experiments now publicly available,our calculations indicate that post-fracture casing fragment acceleration is,for most systems,unlikely to be reduced significantly.展开更多
With the technical development of new warhead designs and improvised explosive device protection,irregular casing filled with explosive has been paid more attention recently. In this paper, we studied the fragmentatio...With the technical development of new warhead designs and improvised explosive device protection,irregular casing filled with explosive has been paid more attention recently. In this paper, we studied the fragmentation of a type of D-shaped casing, which is a common asymmetric casing in the field of warhead design. Based on the radiograph technique, static explosive experiments were conducted with D-shaped casings under four different eccentric initiation ratios to explore their fragmentation. A numerical model was then established to simulate the dynamic response of D-shaped casing filled with explosive. The results of numerical simulation were found to agree well with the experimental data.According to the results of numerical simulation and experimental data, the dynamic responses of Dshaped casing were analyzed. The results of the current work pave way for the innovative design of new warhead and for further studying the dynamic response of asymmetric casing.展开更多
文摘Objective:To explore the effect of fragmented case teaching in the standardized training of residents in anesthesiology department.Methods:80 doctors who participated in the standardized training of residents in anesthesiology department from January 2021 to January 2022 were selected as the research objects,and the 80 doctors were divided into experimental groups according to the clinical teaching mode(n=40,implemented case fragmented teaching method)and the control group(n=40,traditional teaching method).The training lasted for 2 months,and the medical history collection,medical record analysis,practical operation ability,theoretical assessment results,and the degree of satisfaction towards the training of the two groups of doctors were compared.Results:After 2 months of training,the theoretical knowledge and operational ability of the doctors in the two groups have improved to a certain extent,but the medical history collection,medical record analysis,practical operation ability,theoretical assessment results and satisfaction of the doctors in the experimental group were significantly better than those in the control group(P<0.05).Conclusion:The effect of the fragmented case teaching method in the standardized training of anesthesiology residents is significantly better than the traditional teaching mode.The abilities of doctors have significantly improved after the training.Hence,the fragmented case teaching method is worthy of promotion in clinical practice.
基金sponsored by the NWIPT Department of the U.K.Ministry of Defence
文摘It has been said that,once a bomb casing has fractured, "detonation gases will then stream around the fragments or bypass them,and the acceleration process stops there." However,while apparently copious gas flow through casing fractures indicates some pressure release,it is also an indication of significant gas drive pressure,post casing fracture.This paper shows two approaches to the problem of calculating the actual loss of drive.One presents first-order analytical calculations,in cylindrical geometry,of pressure loss to the inside surface of a fractured casing.The second shows the modelling of a selected example in the CTH code.Both approaches reveal that gas escape,while occurring at its own soundspeed relative to the adjacent casing fragments,has to compete with rapid radial expansion of the casing.Together with some historic experiments now publicly available,our calculations indicate that post-fracture casing fragment acceleration is,for most systems,unlikely to be reduced significantly.
基金supported by the National Natural Science Foundation of China [grant number 11772059]the National KeyResearch and Development Program of China [grant number 2017yfc0822300]+1 种基金the 111 Project[grant number G20012017001]the Foundation of State Key Laboratory of Explosion Science and Technology of China[grant number KFJJ13-1Z]
文摘With the technical development of new warhead designs and improvised explosive device protection,irregular casing filled with explosive has been paid more attention recently. In this paper, we studied the fragmentation of a type of D-shaped casing, which is a common asymmetric casing in the field of warhead design. Based on the radiograph technique, static explosive experiments were conducted with D-shaped casings under four different eccentric initiation ratios to explore their fragmentation. A numerical model was then established to simulate the dynamic response of D-shaped casing filled with explosive. The results of numerical simulation were found to agree well with the experimental data.According to the results of numerical simulation and experimental data, the dynamic responses of Dshaped casing were analyzed. The results of the current work pave way for the innovative design of new warhead and for further studying the dynamic response of asymmetric casing.
