The Experts below are selected from a list of 111 Experts worldwide ranked by ideXlab platform

M.k. James - One of the best experts on this subject based on the ideXlab platform.

  • Sensitivity enhancement for gas sensing and electronic nose applications
    Sensors and Actuators B: Chemical, 1993
    Co-Authors: H.v. Shurmer, P. Corcoran, M.k. James
    Abstract:

    Abstract The sensitivity of varistor types of gas detector may be severely restricted by conventional techniques of deriving the system input signal from a voltage change arising from a dual-arm Potential Divider. A much more effective means of analogue signal processing for high sensitivity can be achieved through the use of a.c. bridge methods, together with narrow-band filtering to enhance the signal-to-noise ratio. Such methods have been applied to commercial tin dioxide sensing devices intended for use in an electronic nose and we present results showing them to give sensitivity improvements of about two orders of magnitude, with an expectancy of further improvement following circuit refinement. The techniques are equally applicable to the sensing of individual gases, gas mixtures or complex odours.

Madhanagopal J. - One of the best experts on this subject based on the ideXlab platform.

  • New device for intrinsic hand muscle strength measurement: an alternative to strain gauge handheld dynamometer
    'SAGE Publications', 2017
    Co-Authors: Madhanagopal J., Singh O. P., Sathasivam K., Omar A. H., Abdul Kadir M. R.
    Abstract:

    An accurate measurement of intrinsic hand muscle strength (IHMS) is required by clinicians for effective clinical decision-making, diagnosis of certain diseases, and evaluation of the outcome of treatment. In practice, the clinicians use Intrins-o-meter and Rotterdam Intrinsic Hand Myometer for IHMS measurement. These are quite bulky, expensive, and possess poor interobserver reliability (37–52%) and sensitivity. The purpose of this study was to develop an alternative lightweight, accurate, cost-effective force measurement device with a simple electronic circuit and test its suitability for IHMS measurement. The device was constructed with ketjenblack/deproteinized natural rubber sensor, 1-MΩ Potential Divider, and Arduino Uno through the custom-written software. Then, the device was calibrated and tested for accuracy and repeatability within the force range of finger muscles (100 N). The 95% limit of agreement in accuracy from −1.95 N to 2.06 N for 10 to 100 N applied load and repeatability coefficient of ±1.91 N or 6.2% was achieved. Furthermore, the expenditure for the device construction was around US$ 53. For a practical demonstration, the device was tested among 16 participants for isometric strength measurement of the ulnar abductor and dorsal interossei. The results revealed that the performance of the device was suitable for IHMS measurement

  • New Device for Intrinsic Hand Muscle Strength Measurement: An Alternative to Strain Gauge Handheld Dynamometer
    'SAGE Publications', 2017
    Co-Authors: Madhanagopal J., Singh O.p., Sathasivam K.v., Omar A.h., Abdul Kadir M.r.
    Abstract:

    © The Author(s) 2017. An accurate measurement of intrinsic hand muscle strength (IHMS) is required by clinicians for effective clinical decision-making, diagnosis of certain diseases, and evaluation of the outcome of treatment. In practice, the clinicians use Intrins-o-meter and Rotterdam Intrinsic Hand Myometer for IHMS measurement. These are quite bulky, expensive, and possess poor interobserver reliability (37–52%) and sensitivity. The purpose of this study was to develop an alternative lightweight, accurate, cost-effective force measurement device with a simple electronic circuit and test its suitability for IHMS measurement. The device was constructed with ketjenblack/deproteinized natural rubber sensor, 1-MΩ Potential Divider, and Arduino Uno through the custom-written software. Then, the device was calibrated and tested for accuracy and repeatability within the force range of finger muscles (100 N). The 95% limit of agreement in accuracy from −1.95 N to 2.06 N for 10 to 100 N applied load and repeatability coefficient of ±1.91 N or 6.2% was achieved. Furthermore, the expenditure for the device construction was around US$ 53. For a practical demonstration, the device was tested among 16 participants for isometric strength measurement of the ulnar abductor and dorsal interossei. The results revealed that the performance of the device was suitable for IHMS measurement

John Nunn - One of the best experts on this subject based on the ideXlab platform.

  • DIY soundcard based temperature logging system. Part I: design
    Physics Education, 2016
    Co-Authors: John Nunn
    Abstract:

    This paper aims to enable schools to make their own low-cost temperature logging instrument and to learn a something about its calibration in the process. This paper describes how a thermistor can be integrated into a simple Potential Divider circuit which is powered with the sound output of a computer and monitored by the microphone input. The voltage across a fixed resistor is recorded and scaled to convert it into a temperature reading in the range 0–100 °C. The calibration process is described with reference to fixed points and the effects of non-linearity are highlighted. An optimised calibration procedure is described which enables sub degree resolution and a software program was written which makes it possible to log, display and save temperature changes over a user determined period of time.

H.v. Shurmer - One of the best experts on this subject based on the ideXlab platform.

  • Sensitivity enhancement for gas sensing and electronic nose applications
    Sensors and Actuators B: Chemical, 1993
    Co-Authors: H.v. Shurmer, P. Corcoran, M.k. James
    Abstract:

    Abstract The sensitivity of varistor types of gas detector may be severely restricted by conventional techniques of deriving the system input signal from a voltage change arising from a dual-arm Potential Divider. A much more effective means of analogue signal processing for high sensitivity can be achieved through the use of a.c. bridge methods, together with narrow-band filtering to enhance the signal-to-noise ratio. Such methods have been applied to commercial tin dioxide sensing devices intended for use in an electronic nose and we present results showing them to give sensitivity improvements of about two orders of magnitude, with an expectancy of further improvement following circuit refinement. The techniques are equally applicable to the sensing of individual gases, gas mixtures or complex odours.

K. Futamata - One of the best experts on this subject based on the ideXlab platform.

  • Approximating RC distributed circuit in simulating 700 kV Potential Divider for switching impulse voltage
    11th International Symposium on High-Voltage Engineering (ISH 99), 1999
    Co-Authors: Shuji Sato, T. Wakimoto, Tatsuya Harada, M. Saeki, K. Futamata
    Abstract:

    'This paper quantitatively analyses an error in approximating a RC distributed line by discrete elements. It is to be clarified that with a normal RC ladder approximation, error evaluated in the response time does not become negligibly small even when a RC distributed circuit is simulated by as many as 50 small discrete RC elements. In the paper, more e efficient approximation, which makes the error small enough to be neglected even using some ten discrete elements only, is to be introduced. The proposed approximation is applied to the unit step response analysis of the Potential Divider for the switching impulse voltage and its effectiveness is confirmed in comparison to the measured response.