Detection on the Pulse Signal of Human Body Based on Piezoelectric Impedance Technique

2014 ◽  
Vol 989-994 ◽  
pp. 1120-1124
Author(s):  
Jun Zhang ◽  
Bang Zeng Guo ◽  
Hong Mei Tang
Keyword(s):  
Human Body ◽  
Pulse Wave ◽  
Pulse Signal ◽  
Experiment Platform ◽  
Impedance Technique ◽  
Piezoelectric Impedance ◽  
Series Of Experiments ◽  
Set Up ◽  
Impedance Sensor ◽  
Physiological Characters

Pulse wave is one of important physiological characters of human body. Detection on pulse sign is helpful for health care and treatment of disease. In order to detect the change of pulse signal of human body, the work principle of detection based on the piezoelectric impedance technique was presented and a new piezoelectric impedance sensor was designed. With an experiment platform set up, detection experiments of pulse signal were created. Two methods were used to deal with the experimental data. Results from a series of experiments intuitively show that with pressure applied to human body bigger and bigger, the pressure index increases gradually. It illustrates that the change of pulse signal is bigger and bigger. The result indicates that this method has good sensitivity and provides a new detection method. The experiment shows that the piezoelectric impedance technique is feasible to detect the change of pulse sign.

Human Physiological Signal Recognition Based on Piezoelectric Impedance Technique

2014 ◽  
Vol 687-691 ◽  
pp. 4089-4092
Author(s):  
Jun Zhang ◽  
Jie Huang ◽  
Hong Mei Tang ◽  
Xian Hua Li ◽  
Qing Yang Cai
Keyword(s):  
Human Body ◽  
Physiological Signals ◽  
Signal Recognition ◽  
Coupling Impedance ◽  
Experiment Platform ◽  
Physiological Signal ◽  
Impedance Technique ◽  
Piezoelectric Coupling ◽  
Piezoelectric Impedance ◽  
Set Up

In order to verify whether the piezoelectric impedance technology can be applied to detect the physiological signals of human body, the principle of piezoelectric coupling impedance theory and piezoelectric impedance technology using for human physiological signal detection was introduced in this paper. With an experiment platform set up, detection experiments based on the piezoelectric impedance technology were created. And the experimental1 was improved to avoid the influence of man-made factors on experiment result. Two methods were used to deal with the experimental data. The results show that the piezoelectric impedance technique can be applied to identify the human body physiological signal, and offers a totally new idea to detect the physiological signals of human body.

Experiments on the flow of heat in liquid helium below 0.7 °K

1958 ◽  
Vol 246 (1246) ◽  
pp. 390-405 ◽  
Keyword(s):  
Thermal Conductivity ◽  
Liquid Helium ◽  
Free Path ◽  
Empirical Relation ◽  
Mean Free Path ◽  
Series Of Experiments ◽  
The Mean ◽  
Set Up ◽  
Low Pressures ◽  
Measured Thermal Conductivity

A series of experiments has been performed to study the steady flow of heat in liquid helium in tubes of diameter 0.05 to 1.0 cm at temperatures between 0.25 and 0.7 °K. The results are interpreted in terms of the flow of a gas of phonons, in which the mean free path λ varies with temperature, and may be either greater or less than the diameter of the tube d . When λ ≫ d the flow is limited by the scattering of the phonons at the walls, and the effect of the surface has been studied, but when λ ≪ d viscous flow is set up in which the measured thermal conductivity is increased above that for wall scattering. This behaviour is very similar to that observed in the flow of gases at low pressures, and by applying kinetic theory to the problem it can be shown that the mean free path of the phonons characterizing viscosity can be expressed by the empirical relation λ = 3.8 x 10 -3 T -4.3 cm. This result is inconsistent with the temperature dependence of λ as T -9 predicted theoretically by Landau & Khalatnikov (1949).

Improved Vibration-Model-Based Analysis for Estimation of Arterial Parameters From Noninvasively Measured Arterial Pulse Signals

2020 ◽  
Author(s):  
Md Mahfuzur Rahman ◽  
Najmin Ara Sultana ◽  
Linda Vahala ◽  
Leryn Reynolds ◽  
Zhili Hao
Keyword(s):  
Arterial Wall ◽  
Pulse Wave ◽  
Pulse Signal ◽  
Arterial Pulse ◽  
Post Exercise ◽  
First Order ◽  
Model Based ◽  
Vibration Model ◽  
Key Features ◽  
Model Based Analysis

Abstract With the goal of achieving consistence in interpretation of an arterial pulse signal between its vibration model and its hemodynamic relations and improving its physiological implications in our previous study, this paper presents an improved vibration-model-based analysis for estimation of arterial parameters: elasticity (E), viscosity (η), and radius (r0) at diastolic blood pressure (DBP) of the arterial wall, from a noninvasively measured arterial pulse signal. The arterial wall is modeled as a unit-mass vibration model, and its spring stiffness (K) and damping coefficient (D) are related to arterial parameters. Key features of a measured pulse signal and its first-order and second-order derivatives are utilized to estimate the values of K and D. These key features are then utilized in hemodynamic relations, where their interpretation is consistent with the vibration model, to estimate the value of r0 from K and D. Consequently, E, η, and pulse wave velocity (PWV) are also estimated from K and D. The improved vibration-model-based analysis was conducted on pulse signals of a few healthy subjects measured under two conditions: at-rest and immediately post-exercise. With E, r0, and PWV at-rest as baseline, their changes immediately post-exercise were found to be consistent with the related findings in the literature. Thus, this improved vibration-model-based analysis is validated and contributes to estimation of arterial parameters with better physiological implications, as compared with its previous counterpart.

Influence of the chemical composition of table salt on gemolysis

1927 ◽  
Vol 23 (4) ◽  
pp. 462-462
Author(s):  
A. Tselischeva
Keyword(s):  
Chemical Composition ◽  
Table Salt ◽  
Series Of Experiments ◽  
Set Up

To find out the influence of the chemical composition of salt on hemolysis, the authors set up a series of experiments with titration of hemolytic sera and complement, and tested a number of physiological NaCl solutions used in the laboratories of Moscow.

Effects of Different Sample Resistances on the Insulator Leakage Current Acquisition Results

2014 ◽  
Vol 644-650 ◽  
pp. 3468-3471
Author(s):  
Peng Chao Miao ◽  
Zhi Niu Xu
Keyword(s):  
Leakage Current ◽  
Pulse Signal ◽  
Porcelain Insulator ◽  
Measurement Result ◽  
Power Frequency ◽  
Series Of Experiments

The sampling resistor method is commonly used in the laboratory to measure the insulator leakage current. To study the effects of different resistance on the leakage current acquisition results, a series of experiments are systematically conducted in laboratory. Leakage current waveforms of a clean porcelain insulator under 9 kV and 27 kV power frequency voltages are acquired respectively through the oscilloscope with sampling resistance of 5 Ω, 10 Ω, 100 Ω, 1 kΩ and 17 kΩ. The results reveal that: rated voltage been applied, weak discharge exits on the surface of the porcelain insulator which leads to the appearance of the pulse in the leakage current waveforms and a larger sampling resistance weakens the pulse signal. When the voltage is 9 kV, the measurement result under 5 Ω sampling resistance is 49.4 times amplitude of the result under 17 kΩ sampling resistance and when the voltage turns to 27 kV, the ratio increased to 131.5.

Effect on Water Leak of Tiled Roofs by Wind Flow Over Japanese Residence

2010 ◽  
Author(s):  
Satoru Okamoto
Keyword(s):  
Wind Tunnel ◽  
Low Frequency ◽  
Video Camera ◽  
Wind Flow ◽  
Leak Test ◽  
Low Velocity ◽  
Artificial Rainfall ◽  
Water Leak ◽  
Series Of Experiments ◽  
Set Up

This paper describes a water leak test of roof tiles. The 100 roof tiles were set up on 10 lines and 10 rows on the pitched roof in the downstream of the flow from the wind tunnel. The flow velocity was increased gradually from the low velocity to the high velocity, and the effects of the wind on the roof tiles were investigated by the water leak test. The situation of the water leak test was filmed by video camera. Two accelerometers were simultaneously used. The roof tiles which showed significant vibration at any velocity were found in a series of experiments and the accelerometers were attached to the two neighboring roof tiles on the model roof. The water leak phenomena in the experiment by using the artificial rainfall apparatus are discussed in this paper. Some mechanisms with relatively large amplitudes at low-frequency vibrations, which caused water leak phenomena were made clear.

A Case Study of Developing SEMI PV Standards in Taiwan (2009~2014)

2017 ◽  
Vol 870 ◽  
pp. 231-236
Author(s):  
Shu Tsung Hsu ◽  
Yean San Long ◽  
Teng Chun Wu
Keyword(s):  
Task Force ◽  
Photovoltaic Cell ◽  
Test Methods ◽  
Technical Committee ◽  
Photovoltaic Module ◽  
Specific Test ◽  
Series Of Experiments ◽  
Set Up ◽  
Cell Module

This work aims to analysis the SEMI PV standards developed in Taiwan during 2009 to 2014. The major technical committee (TC) and task force (TF) include Photovoltaic Technical Committee (2009), Photovoltaic Module Vibration TF (2010), Photovoltaic Cell Vibration TF (2011), Package Performance TF (2012), OPV and DSSC TF (2013), BIPV TF (2013) and Reliability TF (2014). ITRI coordinated these TFs to set up a series of experiments and discussions, which focused on the performance evaluation for PV cell, module and materials. The TFs have developed four standards include SEMI PV23 (2011), SEMI PV38 (2012), SEMI PV56 (2014) and SEMI PV57 (2014). Through these standardizations, some specific test methods and test flows were completed to evaluate the reliability for both c-Si and organic/inorganic PV products, which are helpful to improve the performances of cell and module, and propose the common testing guidelines for PV industry to refer to when desired.

Research and Realization of Simulation for Automobile Steering Resisting Torque

2015 ◽  
Vol 733 ◽  
pp. 745-748 ◽  
Author(s):  
Li Ying Wu ◽  
Tong Qiang Xu ◽  
Tian Luo
Keyword(s):  
Control System ◽  
Simulation Model ◽  
Working Conditions ◽  
Model Simulation ◽  
Steering System ◽  
System Control ◽  
Experiment Platform ◽  
Test Platform ◽  
Loading Device ◽  
Set Up

In this paper, through analyzing the generating mechanism of automobile steering resisting torque, we build MATLAB/SIMULINK torque simulation model and get the steering resisting torque under different working conditions. And the results show that the model has a higher accuracy through comparing it with actual measured steering resisting torque. Design and set up the experiment platform composed of three parts including steering system, control system and torque loading device. Based on the data of steering resisting torque obtained from the model simulation, we manipulate torque loading device to input a certain of resistance for steering system ,thus to realize accurate simulation of various steering condition on test platform ,which has paved the way for the development and debugging of EPS controller.

scholarly journals Human Heart Pulse Wave Responses Measured Simultaneously at Several Sensor Placements by Two MR-Compatible Fibre Optic Methods

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Teemu Myllylä ◽  
Vesa Korhonen ◽  
Erkki Vihriälä ◽  
Hannu Sorvoja ◽  
Tuija Hiltunen ◽  
...  
Keyword(s):  
Magnetic Resonance ◽  
Human Body ◽  
Pulse Wave ◽  
Accurate Determination ◽  
Pulse Transit Time ◽  
Measurement Methods ◽  
University Hospital ◽  
Fibre Optic ◽  
Accelerometer Sensor ◽  
Magnetic Resonance Imaging Mri

This paper presents experimental measurements conducted using two noninvasive fibre optic methods for detecting heart pulse waves in the human body. Both methods can be used in conjunction with magnetic resonance imaging (MRI). For comparison, the paper also performs an MRI-compatible electrocardiogram (ECG) measurement. By the simultaneous use of different measurement methods, the propagation of pressure waves generated by each heart pulse can be sensed extensively in different areas of the human body and at different depths, for example, on the chest and forehead and at the fingertip. An accurate determination of a pulse wave allows calculating the pulse transit time (PTT) of a particular heart pulse in different parts of the human body. This result can then be used to estimate the pulse wave velocity of blood flow in different places. Both measurement methods are realized using magnetic resonance-compatible fibres, which makes the methods applicable to the MRI environment. One of the developed sensors is an extraordinary accelerometer sensor, while the other one is a more common sensor based on photoplethysmography. All measurements, involving several test patients, were performed both inside and outside an MRI room. Measurements inside the MRI room were conducted using a 3-Tesla strength closed MRI scanner in the Department of Diagnostic Radiology at the Oulu University Hospital.

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