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Wan D, Xia X, Wang H, He S, Dong J, Dai J, Guan D, Zheng J, Yang X, Zi Y. A Compact-Sized Fully Self-Powered Wireless Flowmeter Based on Triboelectric Discharge. Small Methods 2024:e2301670. [PMID: 38634248 DOI: 10.1002/smtd.202301670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/29/2024] [Indexed: 04/19/2024]
Abstract
Flow sensing exhibits significant potential for monitoring, controlling, and optimizing processes in industries, resource management, and environmental protection. However, achieving wireless real-time and omnidirectional sensing of gas/liquid flow on a simple, self-contained device without external power support has remained a formidable challenge. In this study, a compact-sized, fully self-powered wireless sensing flowmeter (CSWF) is introduced with a small size diameter of down to less than 50 mm, which can transmit real-time and omnidirectional wireless signals, as driven by a rotating triboelectric nanogenerator (R-TENG). The R-TENG triggers the breakdown discharge of a gas discharge tube (GDT), which enables flow rate wireless sensing through emitted electromagnetic waves. Importantly, the performance of the CSWF is not affected by the R-TENG's varied output, while the transmission distance is greater than 10 m. Real-time wireless remote monitoring of wind speed and water flow rate is successfully demonstrated. This research introduces an approach to achieve a wireless, self-powered environmental monitoring system with a diverse range of potential applications, including prolonged meteorological observations, marine environment monitoring, early warning systems for natural disasters, and remote ecosystem monitoring.
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Affiliation(s)
- Dong Wan
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
| | - Xin Xia
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
| | - Haoyu Wang
- Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Shaoshuai He
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
| | - Jiadan Dong
- State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan, 430079, China
| | - Jinhong Dai
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
| | - Dong Guan
- College of Mechanical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225127, China
| | - Junyu Zheng
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
| | - Xiya Yang
- Institute of New Energy Technology, College of Information Science and Technology, Jinan University, Guangzhou, 510632, China
| | - Yunlong Zi
- Thrust of Sustainable Energy and Environment, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou, Guangdong, 511400, China
- HKUST Shenzhen-Hong Kong Collaborative Innovation Research Institute, Futian, Shenzhen, Guangdong, 518048, China
- Guangzhou HKUST Fok Ying Tung Research Institute, Guangzhou, Guangdong, 511400, China
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Smyth M, Drapeau DJ, Milne AD. Massive circuit leak due to a hidden cause: a fractured ventilator flow sensor. Can J Anaesth 2023; 70:2016-2017. [PMID: 37789218 DOI: 10.1007/s12630-023-02611-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 07/27/2023] [Accepted: 09/06/2023] [Indexed: 10/05/2023] Open
Affiliation(s)
- Michael Smyth
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS, Canada.
| | - Dennis J Drapeau
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS, Canada
| | - Andrew D Milne
- Department of Anesthesia, Pain Management and Perioperative Medicine, Dalhousie University, Halifax, NS, Canada
- School of Biomedical Engineering, Dalhousie University, Halifax, NS, Canada
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Xu X, Zhang L, Guo H, Wang X, Kong L. Acoustic Characterization of Transmitted and Received Acoustic Properties of Air-Coupled Ultrasonic Transducers Based on Matching Layer of Organosilicon Hollow Glass Microsphere. Micromachines (Basel) 2023; 14:2021. [PMID: 38004877 PMCID: PMC10673132 DOI: 10.3390/mi14112021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2023] [Revised: 10/23/2023] [Accepted: 10/27/2023] [Indexed: 11/26/2023]
Abstract
An air-coupled transducer was developed in this study, utilizing hollow glass microsphere-organosilicon composites as an acoustically matching layer, which demonstrated outstanding acoustic performance. Firstly, a comparison and analysis of the properties and advantages of different substrates was carried out to determine the potential application value of organosilicon substrates. Immediately after, the effect of hollow glass microspheres with different particle sizes and mass fractions on the acoustic properties of the matching layer was analyzed. It also evaluated the mechanical properties of the matching layer before and after optimization. The findings indicate that the optimized composite material attained a characteristic acoustic impedance of 1.04 MRayl and an acoustic attenuation of 0.43 dB/mm, displaying exceptional acoustic performance. After encapsulating the ultrasonic transducer using a 3D-printed shell, we analyzed and compared its emission and reception characteristics to the commercial transducer and found that its emission acoustic pressure amplitude and reception voltage amplitude were 34% and 26% higher, respectively. Finally, the transducer was installed onto a homemade ultrasonic flow meter for practical application verification, resulting in an accuracy rate of 97.4%.
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Affiliation(s)
- Xinhu Xu
- Thermometry Devision, National Institute of Metrology, Beijing 100029, China;
- School of Quality and Technical Supervision, Hebei University, Baoding 071000, China; (X.W.); (L.K.)
| | - Liang Zhang
- Thermometry Devision, National Institute of Metrology, Beijing 100029, China;
- Zhengzhou Institute of Metrology, Zhengzhou 450001, China;
| | - Hulin Guo
- Zhengzhou Institute of Metrology, Zhengzhou 450001, China;
| | - Xiaojie Wang
- School of Quality and Technical Supervision, Hebei University, Baoding 071000, China; (X.W.); (L.K.)
| | - Lingcai Kong
- School of Quality and Technical Supervision, Hebei University, Baoding 071000, China; (X.W.); (L.K.)
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Baek SH, Lee KI, Kim SM. Development of Real-Time Monitoring System Based on IoT Technology for Curing Compound Application Process during Cement Concrete Pavement Construction. Sensors (Basel) 2023; 23:8187. [PMID: 37837017 PMCID: PMC10575022 DOI: 10.3390/s23198187] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 09/25/2023] [Accepted: 09/28/2023] [Indexed: 10/15/2023]
Abstract
Among the construction processes of Portland cement concrete pavement (PCCP), the curing compound spraying process is one of the most important processes. If the curing compound spraying amount does not meet the standard or if the curing compound is not applied evenly, distresses occur at the early age of construction, ultimately causing deterioration in concrete pavement performance. The purpose of this study is to develop a real-time monitoring system for a curing compound spraying process based on the Internet of Things (IoT) and sensing technologies to improve the construction quality of concrete pavement. To achieve the goal of this research, we conducted various laboratory and field experiments. The curing compound spraying amount and sprayed status were measured and analyzed using flowmeters, image acquisition sensors, and an image processing program, and the data were provided to workers in real time and simultaneously transmitted to the IoT cloud to form a database. From this study, it is confirmed that the IoT-technology-based curing compound spraying amount and sprayed status monitoring systems can be successfully established to manage construction quality related to the curing of concrete pavement.
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Affiliation(s)
| | | | - Seong-Min Kim
- Department of Civil Engineering, Kyung Hee University, Gyeonggi 17104, Republic of Korea; (S.H.B.); (K.I.L.)
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Ramakrishnan V, Arsalan M. A Pressure-Based Multiphase Flowmeter: Proof of Concept. Sensors (Basel) 2023; 23:7267. [PMID: 37631803 PMCID: PMC10459965 DOI: 10.3390/s23167267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/16/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023]
Abstract
Multiphase flowmeters (MPFMs) measure the flow rates of oil, gas, and brine in a pipeline. MPFMs provide remote access to real-time well production data that are essential for efficient oil field operations. Most MPFMs are complex systems requiring frequent maintenance. An MPFM that is operationally simple and accurate is highly sought after in the energy industry. This paper describes an MPFM that uses only pressure sensors to measure gas and liquid flow rates. The design is an integration of a previously developed densitometer with an innovative Venturi-type flowmeter. New computing models with strong analytical foundations were developed, aided by empirical correlations and machine-learning-based flow-regime identification. A prototype was experimentally validated in a multiphase flow loop over a wide range of field-like conditions. The accuracy of the MPFM was compared to that of other multiphase metering techniques from similar studies. The results point to a robust, practical MPFM.
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Beltrami FG, Kurz J, Roos E, Spengler CM. Current limits for flowmeter resistance in metabolic carts can negatively affect exercise performance. Physiol Rep 2021; 9:e14814. [PMID: 33904647 PMCID: PMC8077138 DOI: 10.14814/phy2.14814] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 10/30/2020] [Indexed: 12/27/2022] Open
Abstract
PURPOSE To investigate whether a metabolic cart using a flowmeter in the upper range of accepted resistance to airflow (<1.5 cmH2 O∙L-1 ∙s-1 for flows up to 14 L∙s-1 , American Thoracic Society) negatively impacts exercise performance in healthy individuals. METHODS 16 recreationally active males (age 25 ± 1 years, height 180 ± 6 cm, weight 73.5 ± 5.8 kg, all mean ± SD) performed two incremental tests on a bicycle ergometer on each of two visits, using a metabolic cart with a flowmeter of either low (Oxycon Pro) or high (Innocor) airflow resistance. Mouth pressures, gas exchange, blood lactate concentration [La- ], perception of breathlessness, respiratory, and leg exertion were assessed throughout the tests. RESULTS Tests performed with the Innocor were significantly shorter (15.3 ± 3.2 vs. 15.8 ± 3.3 min, p < 0.0001) and showed higher maximal flow resistance (1.3 ± 0.2 vs. 0.3 ± 0.0 cmH2 O∙L-1 ∙s-1 , p < 0.0001). At end-exercise, peak oxygen consumption (-200 ± 220 ml.min-1 , p < 0.0001), minute ventilation (-19.9 ± 10.5 L.min-1 , p < 0.0001), breathing frequency (-5.4 ± 5.2 breaths.min-1 , p < 0.0001), heart rate (-2.1 ± 3.6 bpm, p = 0.002) and [La- ] (-0.7 ± 1.0 mmol.L-1 , p < 0.0001), but not tidal volume (-0.1 ± 0.2 L, p = 0.172) were lower with the Innocor, while the perception of breathlessness was higher (+3.8 ± 5.1 points, p < 0.0001). CONCLUSIONS Airflow resistance in the upper range of current guidelines can significantly affect exercise performance and respiratory pattern in young, healthy males during incremental exercise. The present results indicate the need to revisit guidelines for devices used in ergospirometry.
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Affiliation(s)
- Fernando G. Beltrami
- Exercise Physiology LabInstitute of Human Movement Sciences and SportETH ZurichZurichSwitzerland
| | - Jérôme Kurz
- Exercise Physiology LabInstitute of Human Movement Sciences and SportETH ZurichZurichSwitzerland
| | - Elena Roos
- Exercise Physiology LabInstitute of Human Movement Sciences and SportETH ZurichZurichSwitzerland
| | - Christina M. Spengler
- Exercise Physiology LabInstitute of Human Movement Sciences and SportETH ZurichZurichSwitzerland
- Zurich Center for Integrative Human Physiology (ZIHP)University of ZurichZurichSwitzerland
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Jin J, Chung Y, Park J. Development of a Flowmeter Using Vibration Interaction between Gauge Plate and External Flow Analyzed by LSTM. Sensors (Basel) 2020; 20:E5922. [PMID: 33092213 DOI: 10.3390/s20205922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Revised: 10/08/2020] [Accepted: 10/17/2020] [Indexed: 11/17/2022]
Abstract
(1) Background: This study is aimed at the development of a precise and inexpensive device for flow information measurement for external flow. This novel flowmeter uses an LSTM (long short-term memory) neural network algorithm to analyze the vibration responses of the gauge plate. (2) Methods: A signal processing method using an LSTM neural network is proposed for the development of mass flow rate estimation by sensing the vibration responses of a gauge plate. An FFT (fast Fourier transform) and an STFT (short-time Fourier transform) were used to analyze the vibration characteristics of the gauge plate depending on the mass flow rate. For precise measurements, the vibration level and roughness were computed and used as input features. The actual mass flow rate measured by using a weight transducer was employed as the output features for the LSTM prediction model. (3) Results: The estimated flow rate matched the actual measured mass flow rate very closely. The deviations in measurements for the total mass flow were less than 6%. (4) Conclusions: The estimation of the mass flow rate for external flow through the proposed flowmeter by use of vibration responses analyzed by the LSTM neural network was proposed and verified.
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A Nour M, M Hussain M. A Review of the Real-Time Monitoring of Fluid-Properties in Tubular Architectures for Industrial Applications. Sensors (Basel) 2020; 20:E3907. [PMID: 32674278 DOI: 10.3390/s20143907] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/06/2020] [Accepted: 07/10/2020] [Indexed: 01/30/2023]
Abstract
The real-time monitoring of fluid properties in tubular systems, such as viscosity and flow rate, is essential for industries utilizing liquid mediums. Nowadays, most studies of the fluid characteristics are performed off-line using laboratory facilities that can provide accurate results, yet they do not match the demanded industrial pace. Off-line measurements are ineffective and time-consuming. The available real-time monitoring sensors for fluid properties are generally destructive methods that produce significant and persistent damage to the tubular systems during the installation process. Others use huge and bulky invasive instrument methods that generate considerable pressure reduction and energy loss in tubular systems. For these drawbacks, industries centered their attention on non-invasive and non-destructive testing (NDT) methodologies, which are installed on the outer tubular surface to avoid flow disturbance and desist shutting down systems for installations. Although these sensors showed excellent achievement for monitoring and inspecting pipe health conditions, the performance was not convincing for monitoring the properties of fluids. This review paper presents an overview of the real-time monitoring of fluid properties in tubular systems for industrial applications, particularly for pipe monitoring sensors, viscosity, and flow measurements. Additionally, the different available sensing mechanisms and their advantages, drawbacks, and potentials are discussed.
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9
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Raillard M, Levionnois O, MacFarlane P. Do the Manual or Computer-Controlled Flowmeters Generate Similar Isoflurane Concentrations in Tafonius? Front Vet Sci 2019; 6:160. [PMID: 31192237 PMCID: PMC6549471 DOI: 10.3389/fvets.2019.00160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Accepted: 05/10/2019] [Indexed: 12/03/2022] Open
Abstract
Introduction: Tafonius is an anesthesia machine with computer-controlled monitor and ventilator. We compared the isoflurane fluctuations in the circuit with manual (MF) or computer-driven (CF) flowmeters, investigated the origin of the differences and assessed whether isoflurane concentration time course followed a one-compartment model. Material and Methods: A calibrated TEC-3 isoflurane vaporizer was used. Gas composition and flows were measured using a multiparametric monitor and a digital flowmeter. Measurements included: (1) Effects of various FiO2 with MF/CF on the isoflurane fraction changes in the breathing system during mechanical ventilation of a lung model; wash-in kinetic was fitted to a compartmental model; (2) Gas outflow at the common gas outlet (CGO) with MF/CF at different FiO2; (3) Isoflurane output of the vaporizer at various dial settings with MF/CF set at different flows without and with reduction of the CGO diameter. Results: (1) The 3% targeted isoflurane concentration was not reached; additional time was required to reach specific concentrations with CF (lowest FiO2, longer time). The exponential course fitted a two-compartment model; (2) Set and measured flows were identical with MF. With CF at 0.21 FiO2, flow was intermittently 7.6 L min−1 or zero (mean total: 38% of the set flow); with CF at 1.00 FiO2, flow was 10.6 L min−1 or zero (mean: 4–5.3 L min−1); with 0.21 < FiO2 < 1.00, combined flow was intermittent (maximum output: 15.6 L min−1); (3) With MF, isoflurane output was matching dial setting at 5 L min−1 but was lower at higher flows; with CF generating intermittent flows, isoflurane output was fluctuating. With the 4 mm diameter CGO, isoflurane concentration was close to dial setting with both MF and CF. With a 14 G CGO, isoflurane concentration was lower than dial setting with MF, higher with CF. Conclusions and Clinical Relevance: Using MF or CF led to different isoflurane fraction time course in Tafonius. Flows were lower than set with CF; the TEC-3 did not compensate for high/intermittent flows and pressures; the CGO diameter influenced isoflurane output.
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Affiliation(s)
- Mathieu Raillard
- Bristol Veterinary School, University of Bristol, Bristol, United Kingdom.,Section of Anaesthesiology and Pain Therapy, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Olivier Levionnois
- Section of Anaesthesiology and Pain Therapy, Department of Clinical Veterinary Medicine, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Paul MacFarlane
- Bristol Veterinary School, University of Bristol, Bristol, United Kingdom
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Khan NS, Ghani S, Haider S. Real-Time Analysis of a Sensor's Data for Automated Decision Making in an IoT-Based Smart Home. Sensors (Basel) 2018; 18:E1711. [PMID: 29799478 DOI: 10.3390/s18061711] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/16/2018] [Accepted: 05/19/2018] [Indexed: 11/24/2022]
Abstract
IoT devices frequently generate large volumes of streaming data and in order to take advantage of this data, their temporal patterns must be learned and identified. Streaming data analysis has become popular after being successfully used in many applications including forecasting electricity load, stock market prices, weather conditions, etc. Artificial Neural Networks (ANNs) have been successfully utilized in understanding the embedded interesting patterns/behaviors in the data and forecasting the future values based on it. One such pattern is modelled and learned in the present study to identify the occurrence of a specific pattern in a Water Management System (WMS). This prediction aids in making an automatic decision support system, to switch OFF a hydraulic suction pump at the appropriate time. Three types of ANN, namely Multi-Input Multi-Output (MIMO), Multi-Input Single-Output (MISO), and Recurrent Neural Network (RNN) have been compared, for multi-step-ahead forecasting, on a sensor’s streaming data. Experiments have shown that RNN has the best performance among three models and based on its prediction, a system can be implemented to make the best decision with 86% accuracy.
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11
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Rothfuss MA, Franconi NG, Unadkat JV, Gimbel ML, Star A, Mickle MH, Sejdic E. A System for Simple Real-Time Anastomotic Failure Detection and Wireless Blood Flow Monitoring in the Lower Limbs. IEEE J Transl Eng Health Med 2016; 4:4100114. [PMID: 27730016 PMCID: PMC5052026 DOI: 10.1109/jtehm.2016.2588504] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Revised: 05/27/2016] [Accepted: 06/05/2016] [Indexed: 11/06/2022]
Abstract
Current totally implantable wireless blood flow monitors are large and cannot operate alongside nearby monitors. To alleviate the problems with the current monitors, we developed a system to monitor blood flow wirelessly, with a simple and easily interpretable real-time output. To the best of our knowledge, the implanted electronics are the smallest in reported literature, which reduces bio-burden. Calibration was performed across realistic physiological flow ranges using a syringe pump. The device’s sensors connected directly to the bilateral femoral veins of swine. For each 1 min, blood flow was monitored, then, an occlusion was introduced, and then, the occlusion was removed to resume flow. Each vein of four pigs was monitored four times, totaling 32 data collections. The implant measured 1.70 cm3 without battery/encapsulation. Across its calibrated range, including equipment tolerances, the relative error is less than ±5% above 8 mL/min and between −0.8% and +1.2% at its largest calibrated flow rate, which to the best of our knowledge is the lowest reported in the literature across the measured calibration range. The average standard deviation of the flow waveform amplitude was three times greater than that of no-flow. Establishing the relative amplitude for the flow and no-flow waveforms was found necessary, particularly for noise modulated Doppler signals. Its size and accuracy, compared with other microcontroller-equipped totally implantable monitors, make it a good candidate for future tether-free free flap monitoring studies.
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Affiliation(s)
- Michael A Rothfuss
- Department of Electrical and Computer Engineering Swanson School of Engineering University of Pittsburgh Pittsburgh PA 15261 USA
| | - Nicholas G Franconi
- Department of Electrical and Computer Engineering Swanson School of Engineering University of Pittsburgh Pittsburgh PA 15261 USA
| | - Jignesh V Unadkat
- Department of Plastic Surgery University of Pittsburgh Pittsburgh PA 15261 USA
| | - Michael L Gimbel
- Department of Plastic Surgery University of Pittsburgh Pittsburgh PA 15261 USA
| | - Alexander Star
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Marlin H Mickle
- Department of Electrical and Computer Engineering Swanson School of Engineering University of Pittsburgh Pittsburgh PA 15261 USA
| | - Ervin Sejdic
- Department of Electrical and Computer Engineering Swanson School of Engineering University of Pittsburgh Pittsburgh PA 15261 USA
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Korobiichuk I, Bezvesilna O, Ilchenko A, Shadura V, Nowicki M, Szewczyk R. A Mathematical Model of the Thermo-Anemometric Flowmeter. Sensors (Basel) 2015; 15:22899-913. [PMID: 26378535 DOI: 10.3390/s150922899] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 08/29/2015] [Accepted: 08/31/2015] [Indexed: 11/22/2022]
Abstract
A thermo-anemometric flowmeter design and the principles of its work are presented in the article. A mathematical model of the temperature field in a stream of biofuel is proposed. This model allows one to determine the fuel consumption with high accuracy. Numerical modeling of the heater heat balance in the fuel flow of a thermo-anemometric flowmeter is conducted and the results are analyzed. Methods for increasing the measurement speed and accuracy of a thermo-anemometric flowmeter are proposed.
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13
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Kandemir T, Muslu S, Kandemir E. Sudden Appearance of Water in Flowmeter During Air/Oxygen and Sevoflurane Anaesthesia. Turk J Anaesthesiol Reanim 2015; 43:65-7. [PMID: 27366469 DOI: 10.5152/tjar.2014.57070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Accepted: 04/13/2014] [Indexed: 11/22/2022] Open
Abstract
Endotracheal intubation was performed, and a water bubbling sound was heard from the anaesthesia device immediately after the release of gases to administer the O2-air-sevoflurane mixture. The flowmeter on the anaesthesia device was then found to be filled with water. The breakdown of the dryer in the medical air compressor system was determined as the source of the problem, since a greasy fluid mixture was released from the air-wall outlets in all rooms. Consequently, the anaesthesia team should keep in mind that problems as seen in the current case might emerge and should be alert.
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Affiliation(s)
- Tünay Kandemir
- Clinic of Anaesthesia, Dr. Abdurrahman Yurtaslan Oncology Training and Research Hospital, Ankara, Turkey
| | - Selda Muslu
- Clinic of Anaesthesia, Dr. Abdurrahman Yurtaslan Oncology Training and Research Hospital, Ankara, Turkey
| | - Erbin Kandemir
- Clinic of Anaesthesia, Dr. Abdurrahman Yurtaslan Oncology Training and Research Hospital, Ankara, Turkey
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14
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Pena FL, Diaz AD, Lema MR, Rodriguez SV. A new approach to laminar flowmeters. Sensors (Basel) 2010; 10:10560-10570. [PMID: 22163486 PMCID: PMC3231082 DOI: 10.3390/s101210560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Revised: 11/05/2010] [Accepted: 11/24/2010] [Indexed: 05/31/2023]
Abstract
After studying the performance and characteristics of actual laminar flowmeters a new disposition for this type of sensors is proposed in such a way that the measurement errors introduced by the intrinsic nature of the device can be minimized. The preliminary study shows that the developing entry region introduces non-linearity effects in all these devices. These effects bring about not only errors, but also a change in the slope of the linear calibration respect of the Poiseuille relation. After a subsequent analysis on how these non-linearity errors can be reduced, a new disposition of this type of flowmeters is introduced. This device makes used of flow elements having pressure taps at three locations along its length and connected to three isolated chambers. In this way, the static pressure can be measured at three locations and contributed to by the pressure taps at the level of each chamber. Thus the linearization error is reduced with an additional advantage of producing a reduced pressure drop.
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Affiliation(s)
- Fernando Lopez Pena
- Integrated Group for Engineering Research, University of A Coruña, Escola Politécnica Superior, Mendizábal S/N, 15403 Ferrol, Spain.
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Yanaga K, Makowka L, Shimada M, Esquivel CO, Bowman JS, Todo S, Tzakis AG, Starzl TE. Hepatic artery thrombosis following pediatric liver transplantation: Assessment of blood flow measurement in allografts. Clin Transplant 1989; 3:184-189. [PMID: 21151746 PMCID: PMC3000218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The purpose of this study was to define parameters which could be predictive of hepatic artery thrombosis, which continues to be a major complicating factor in pediatric liver transplantation. The hepatic blood flow of 14 pediatric liver patients (15 grafts) who weighed less than 15 kg was measured electromagnetically during orthotopic liver transplantation. The results of blood flow determination and the clinical data in 7 patients (8 grafts) who developed hepatic artery thrombosis were compared with those of 7 control patients. All patients with a hepatic arterial flow of less than 60 ml/min developed hepatic artery thrombosis (4/8 vs. 0/7; p < 0.05), and the patients with hepatic artery thrombosis exhibited higher total hepatic and portal vein flow per 100 gram of liver tissue (262 vs. 136 ml/min; p < 0.001 and 222 vs. 80 ml/min; p < 0.025, respectively) as well as longer cold preservation time (384 vs. 326 min; p < 0.025). The results of our study suggest that hepatic arterial flows of less than 60 ml/min are critical for the development of hepatic artery thrombosis, and that portal venous overflow and increased preservation times may contribute to the development of hepatic artery thrombosis.
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Affiliation(s)
- Katsuhiko Yanaga
- Department of Surgery, University of Pittsburgh Health Center, Pittsburgh, Pennsylvania, U.S.A
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