In order to overcome the low precision and weak applicability problems of the current municipal water network state simulation model, the water network structure is studied. Since the telemetry system has been applied...In order to overcome the low precision and weak applicability problems of the current municipal water network state simulation model, the water network structure is studied. Since the telemetry system has been applied increasingly in the water network, and in order to reflect the network operational condition more accurately, a new water network macroscopic model is developed by taking the auto-control adjusting valve opening state into consideration. Then for highly correlated or collinear independent variables in the model, the partial least squares (PLS) regression method provides a model solution which can distinguish between the system information and the noisy data. Finally, a hypothetical water network is introduced for validating the model. The simulation results show that the relative error is less than 5.2%, indicating that the model is efficient and feasible, and has better generalization performance.展开更多
By adjusting the testing condition,we obtained the best pulse hydrodynamic per-formance of aortic valve allograft tested in the duplicator made by Chengdu Universi-ty of Science and Technology.Meanwhile,we regarded th...By adjusting the testing condition,we obtained the best pulse hydrodynamic per-formance of aortic valve allograft tested in the duplicator made by Chengdu Universi-ty of Science and Technology.Meanwhile,we regarded the condition of the duplicatoras the consilience of human left circulation.By comparing the results(comparison)ofthe different periods of the cardiac cycle including beat to beat interval(RR),systolictime(ST),left ventricular eject time(LVET)and the relationship between them,which got from the observation on volunteers with normal or prostheses aortic valveby using two dimensional Doppler echocardiography,with that of the testing condi-展开更多
During the hydrodynamic characteristic testing of aortic valve allograft (AVA),the testing condition was adjusted to obtain the best hydraulic performance of AVA.The testing condition,the character of the circulation ...During the hydrodynamic characteristic testing of aortic valve allograft (AVA),the testing condition was adjusted to obtain the best hydraulic performance of AVA.The testing condition,the character of the circulation duplicator,is regarded as to beconsistent with the human circulation in vivo.Then the comparison among the re-sults of AVA orifice area (AVA) estimated by Gorlin formula,the continuity equa-tion and their modified types,respectively,was performed.展开更多
基金Supported by Tianjin Natural Science Foundation( No. 003611611).
文摘In order to overcome the low precision and weak applicability problems of the current municipal water network state simulation model, the water network structure is studied. Since the telemetry system has been applied increasingly in the water network, and in order to reflect the network operational condition more accurately, a new water network macroscopic model is developed by taking the auto-control adjusting valve opening state into consideration. Then for highly correlated or collinear independent variables in the model, the partial least squares (PLS) regression method provides a model solution which can distinguish between the system information and the noisy data. Finally, a hypothetical water network is introduced for validating the model. The simulation results show that the relative error is less than 5.2%, indicating that the model is efficient and feasible, and has better generalization performance.
文摘By adjusting the testing condition,we obtained the best pulse hydrodynamic per-formance of aortic valve allograft tested in the duplicator made by Chengdu Universi-ty of Science and Technology.Meanwhile,we regarded the condition of the duplicatoras the consilience of human left circulation.By comparing the results(comparison)ofthe different periods of the cardiac cycle including beat to beat interval(RR),systolictime(ST),left ventricular eject time(LVET)and the relationship between them,which got from the observation on volunteers with normal or prostheses aortic valveby using two dimensional Doppler echocardiography,with that of the testing condi-
文摘During the hydrodynamic characteristic testing of aortic valve allograft (AVA),the testing condition was adjusted to obtain the best hydraulic performance of AVA.The testing condition,the character of the circulation duplicator,is regarded as to beconsistent with the human circulation in vivo.Then the comparison among the re-sults of AVA orifice area (AVA) estimated by Gorlin formula,the continuity equa-tion and their modified types,respectively,was performed.
