Introduction of a near field component level test and application to an automotive communication system

2019 ◽  
Author(s):  
Emanuel Panholzer ◽  
Martin Aidam ◽  
Walter Franz ◽  
Simon Senega ◽  
Stefan Lindenmeier
Keyword(s):  
Communication System ◽  
Field Component ◽  
Near Field ◽  
Component Level

scholarly journals An Implantable Inductive Near-Field Communication System with 64 Channels for Acquisition of Gastrointestinal Bioelectrical Activity

Sensors ◽  
2019 ◽  
Vol 19 (12) ◽  
pp. 2810 ◽  
Author(s):  
Amir Javan-Khoshkholgh ◽  
Aydin Farajidavar
Keyword(s):  
Real Time ◽  
Radio Frequency Identification ◽  
Communication System ◽  
Near Field ◽  
Data Communication ◽  
Near Field Communication ◽  
Bioelectrical Activity ◽  
Real Time Monitoring ◽  
Rf Transceiver

High-resolution (HR) mapping of the gastrointestinal (GI) bioelectrical activity is an emerging method to define the GI dysrhythmias such as gastroparesis and functional dyspepsia. Currently, there is no solution available to conduct HR mapping in long-term studies. We have developed an implantable 64-channel closed-loop near-field communication system for real-time monitoring of gastric electrical activity. The system is composed of an implantable unit (IU), a wearable unit (WU), and a stationary unit (SU) connected to a computer. Simultaneous data telemetry and power transfer between the IU and WU is carried out through a radio-frequency identification (RFID) link operating at 13.56 MHz. Data at the IU are encoded according to a self-clocking differential pulse position algorithm, and load shift keying modulated with only 6.25% duty cycle to be back scattered to the WU over the inductive path. The retrieved data at the WU are then either transmitted to the SU for real-time monitoring through an ISM-band RF transceiver or stored locally on a micro SD memory card. The measurement results demonstrated successful data communication at the rate of 125 kb/s when the distance between the IU and WU is less than 5 cm. The signals recorded in vitro at IU and received by SU were verified by a graphical user interface.

Source properties of a Blue MT. Lake earthquake

1976 ◽  
Vol 66 (3) ◽  
pp. 677-683
Author(s):  
John G. Anderson ◽  
Jon B. Fletcher
Keyword(s):  
New York ◽  
Spectral Analysis ◽  
Field Component ◽  
Near Field ◽  
Earthquake Source ◽  
Dislocation Model ◽  
S Wave ◽  
Wave Pulse ◽  
Hypocentral Distance ◽  
Source Radius

abstract An accelerogram obtained at Blue Mt. Lake, New York is remarkable for the simplicity of its S-wave pulse. This results from (1) a nearly complete absence of scattering and reflections as second arrivals on the accelerogram, and (2) a very elementary earthquake source. The earthquake identified with this accelerogram had a magnitude mb = 2.2 and a hypocentral distance of about 1 km from the accelerometer. Spectral analysis of the S wave indicates the earthquake had a moment of 8 × 1018 dyne-cm, and a source radius of 20 to 40 m. When the accelerogram is integrated to obtain displacement, there is a step offset of about 5μ associated with a near-field component of the S-wave pulse. The S-wave, including the step offset, can be matched in remarkable detail by a dislocation model with a moment of 8.4 × 1018 dyne-cm.

Evaluation of the Wavelike Disturbance in the Kelvin Wave Source Potential

1988 ◽  
Vol 32 (01) ◽  
pp. 44-53 ◽  
Author(s):  
J. J. M. Baar ◽  
W. G. Price
Keyword(s):  
Numerical Evaluation ◽  
Field Component ◽  
Near Field ◽  
Neumann Series ◽  
Series Expansions ◽  
Effective Solution ◽  
Kelvin Wave ◽  
Wave Source ◽  
Series Representations ◽  
Single Integral

This paper discusses the numerical evaluation of the characteristic Kelvin wavelike disturbance trailing downstream from a translating submerged source. Mathematically the function describing the wavelike disturbance is expressed as a single integral with infinite integration limits and a rapidly oscillatory integrand. Numerical integration of such integrals is both cumbersome and time-consuming. Attention is therefore focused on two complementary Neumann-series expansions which were originally derived by Bessho [1].2 Numerically stable algorithms are presented for the accurate and efficient evaluation of the two series representations. When used in combination with the Chebyshev expansions for the nonoscillatory near-field component which were recently obtained by Newman [2], the present algorithms provide an effective solution to the numerical difficulties associated with the evaluation of the Kelvin wave source potential.

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