The Experts below are selected from a list of 303 Experts worldwide ranked by ideXlab platform
Yong Chen - One of the best experts on this subject based on the ideXlab platform.
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continuous ultrasonic Flow Measurement for aerospace small pipelines
Ultrasonics, 2021Co-Authors: Yong Chen, Yi ChenAbstract:Abstract Aerospace explorations stimulate extensive research on innovative propellant Flow Measurement technologies in microgravity conditions. Ultrasonic-based Measurements have advantages of non-invasive and non-moving-component constructions as well as fast responses to bi-directional Flow detection, its applications in aerospace explorations have already been reported. To avoid the shortages of pulse ultrasonic Measurement configurations, Flow Measurement of continuous ultrasonic wave propagation is presented to match the requirements of large Measurement range and high precision. Fabrication process and laboratory validations using water Flow are presented. Ground experiments show that the linearity of the proposed ultrasonic Flow meter is obtained in the Measurement range [0, 80 ml/s] which is typical requirement in aerospace applications. Meanwhile, the fitted linear feature from the experimental data matches well the theoretical prediction except the Flow prediction of stationary fluid. Under specific configurations, the absolute Measurement error is significantly affected by the corresponding Reynolds number. Furthermore, the absolute Measurement error is smaller when excitation signals with higher frequency are used if the phase tracking performance for different frequencies is identical.
A Welz - One of the best experts on this subject based on the ideXlab platform.
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transit time Flow Measurement in on pump and off pump coronary artery surgery
The Journal of Thoracic and Cardiovascular Surgery, 2003Co-Authors: C Schmitz, Osman Ashraf, Wolfgang Schiller, Claus J Preusse, B Esmailzadeh, J Likungu, Rolf Fimmers, A WelzAbstract:Abstract Objective: Transit time Flow Measurement is frequently used during coronary artery bypass with and without cardiopulmonary bypass to detect graft dysfunction resulting from technical errors. Methods Intraoperative transit time Flow Measurement Measurements of 896 patients requiring surgery for double- or triple-vessel disease were reviewed retrospectively. Six-hundred and ninety-five patients were operated on-pump (Group A: coronary artery bypass with cardiopulmonary bypass), and 201 patients off-pump (Group B: coronary artery bypass without cardiopulmonary bypass). Transit time Flow Measurement Measurements were analyzed for mean Flow (mL/min). In total, Measurements of 2247 grafts were analyzed. Results Transit time Flow Measurement Flows were lower in coronary artery bypass without cardiopulmonary bypass patients (left internal thoracic artery to left anterior descending artery: Group A, 37 [31, 40] mL/min vs Group B, 24 [20, 26] mL/min; saphenous vein graft to left anterior descending artery: Group A, 46.5 [40, 56] mL/min vs Group B, 21 [14, 57] mL/min. Troponin I release was reduced in the coronary artery bypass without cardiopulmonary bypass patients, with median values of 7.8 [7.0, 8.3] μg/L in Group A and 1.2 [0.9, 2.3] μg/L in Group B. Conclusion Evaluation of transit time Flow Measurement is valuable in determining coronary graft patency after coronary artery bypass with cardiopulmonary bypass and coronary artery bypass without cardiopulmonary bypass. Decreased troponin I release suggests a myocardial benefit of coronary artery bypass without cardiopulmonary bypass compared to coronary artery bypass with cardiopulmonary bypass, although the intraoperative transit time Flow Measurement Flow Measurements are markedly lower.
Yi Chen - One of the best experts on this subject based on the ideXlab platform.
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continuous ultrasonic Flow Measurement for aerospace small pipelines
Ultrasonics, 2021Co-Authors: Yong Chen, Yi ChenAbstract:Abstract Aerospace explorations stimulate extensive research on innovative propellant Flow Measurement technologies in microgravity conditions. Ultrasonic-based Measurements have advantages of non-invasive and non-moving-component constructions as well as fast responses to bi-directional Flow detection, its applications in aerospace explorations have already been reported. To avoid the shortages of pulse ultrasonic Measurement configurations, Flow Measurement of continuous ultrasonic wave propagation is presented to match the requirements of large Measurement range and high precision. Fabrication process and laboratory validations using water Flow are presented. Ground experiments show that the linearity of the proposed ultrasonic Flow meter is obtained in the Measurement range [0, 80 ml/s] which is typical requirement in aerospace applications. Meanwhile, the fitted linear feature from the experimental data matches well the theoretical prediction except the Flow prediction of stationary fluid. Under specific configurations, the absolute Measurement error is significantly affected by the corresponding Reynolds number. Furthermore, the absolute Measurement error is smaller when excitation signals with higher frequency are used if the phase tracking performance for different frequencies is identical.
E.a. Hammer - One of the best experts on this subject based on the ideXlab platform.
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recent developments in three phase Flow Measurement
Measurement Science and Technology, 1997Co-Authors: R Thorn, G.a. Johansen, E.a. HammerAbstract:The problem of how to meter oil - water - gas mixtures has been a significant one in the oil industry since the early 1980s. Since then, considerable research has been conducted into the development of a three-phase Flowmeter suitable for use in an offshore environment. This work discusses why three-phase Flow Measurement is important, the principal strategies and technologies which may be used to meter three-phase Flows, and reviews the status of some currently available solutions.
C Schmitz - One of the best experts on this subject based on the ideXlab platform.
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transit time Flow Measurement in on pump and off pump coronary artery surgery
The Journal of Thoracic and Cardiovascular Surgery, 2003Co-Authors: C Schmitz, Osman Ashraf, Wolfgang Schiller, Claus J Preusse, B Esmailzadeh, J Likungu, Rolf Fimmers, A WelzAbstract:Abstract Objective: Transit time Flow Measurement is frequently used during coronary artery bypass with and without cardiopulmonary bypass to detect graft dysfunction resulting from technical errors. Methods Intraoperative transit time Flow Measurement Measurements of 896 patients requiring surgery for double- or triple-vessel disease were reviewed retrospectively. Six-hundred and ninety-five patients were operated on-pump (Group A: coronary artery bypass with cardiopulmonary bypass), and 201 patients off-pump (Group B: coronary artery bypass without cardiopulmonary bypass). Transit time Flow Measurement Measurements were analyzed for mean Flow (mL/min). In total, Measurements of 2247 grafts were analyzed. Results Transit time Flow Measurement Flows were lower in coronary artery bypass without cardiopulmonary bypass patients (left internal thoracic artery to left anterior descending artery: Group A, 37 [31, 40] mL/min vs Group B, 24 [20, 26] mL/min; saphenous vein graft to left anterior descending artery: Group A, 46.5 [40, 56] mL/min vs Group B, 21 [14, 57] mL/min. Troponin I release was reduced in the coronary artery bypass without cardiopulmonary bypass patients, with median values of 7.8 [7.0, 8.3] μg/L in Group A and 1.2 [0.9, 2.3] μg/L in Group B. Conclusion Evaluation of transit time Flow Measurement is valuable in determining coronary graft patency after coronary artery bypass with cardiopulmonary bypass and coronary artery bypass without cardiopulmonary bypass. Decreased troponin I release suggests a myocardial benefit of coronary artery bypass without cardiopulmonary bypass compared to coronary artery bypass with cardiopulmonary bypass, although the intraoperative transit time Flow Measurement Flow Measurements are markedly lower.