R. Reihsner, R. J. Beer , M. Gingerl, H. Millesi
Some manufacturing processes of fiber reinforced soft membranes do not provide knowledge neither about the density nor about the orientation of the fairly random distributed fibers. As a consequence, the result of these processes is often an anisotropic membrane with an unknown, in general inhomogeneous, stiffness distribution. In case of soft membranes both the distribution of the stiffness and the degree of anisotropy are in addition a function of the state of deformation. This leads in general to non-linear constitutive laws. For soft membranes which can only bear membran stresses...
XVI IMEKO World Congress
· TC13
· 2000
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A.G. Polak, J. Mroczka
Numerical procedures for detection of deterministic chaos in non-linear time series have been prepared. The procedures include reconstruction of the phase space, estimation of the maximal Lyapunov exponent and calculation of capacity and correlation dimensions. Prepared algorithms have been successfully tested with simulated data of the Hénon map and the logistic equation, and then used for investigation of the respiratory rate variability (RRV). The dimensions of the RRV signal in the phase space reconstructed are rational numbers and the Lyapunov exponent is positive, suggesting that the...
XVI IMEKO World Congress
· TC13
· 2000
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Y. Tomita, S. Honda, Y. Okajima
The distribution of the conduction velocity (DCV) in peripheral nerve fibers is an important parameter in assessing the condition of nerve fibers during the clinical evaluation of the peripheral nerves. We reported a new method of estimating DCV by using regularized-non-negative-least squares and Fibonacci search for conduction length. Giving supramaximal electrical stimulation at two different sites, we recorded compound action potentials at another site. With the method we estimated DCVs, single fiber action potentials (SFAPs), and the distances between stimulation and recording sites....
XVI IMEKO World Congress
· TC13
· 2000
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T. Morito, Y. Hiraki, H. Yamamoto
In this paper, we developed a left ventricular (LV) wall motion analysis method, and developed a display method of the motion on personal computer monitor. To know precise rotation or deformity, identifiable landmarks must be located. The MRI tagging makes it possible to estimate the regional wall motion noninvasively. We tried to estimate the precise LV wall motion by the MRI tagging. Tagging is achieved by selective saturation pulse method. The difference of the signal intensity between tagged and nontagged regions persist for 400-700 milliseconds. We display the tag point movement as...
XVI IMEKO World Congress
· TC13
· 2000
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S. Morita, K. Shibata, X.–Z. Zheng, K. Ito
For the improvement of the amputee’s activity of daily living (ADL), several kinds of electromyogram (EMG) controlled prosthetic hands have been developed so far. But there is still significant difference between the movements of these hands and human ones. In this paper, we propose a direct torque control method for the prosthetic hand. In order to estimate the joint torque from EMG signals, an artificial neural network by the feedback error learning schema is used. 2- DOF motions, i.e. hand grasping/opening and arm flexion/extension, are picked up. Then it is verified that the neural...
XVI IMEKO World Congress
· TC13
· 2000
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L. Mehnen., E. Kaniusas, E. Leiss, H. Pfützner
The present work concerns the application of magnetostrictive soft magnetic amorphous ribbons for the detection of displacements or weak forces. The principle of signal generation is based on permeability changes as a result of mechanical stress acting in band direction. The elastic band is fixed at one end while the second one is displaced or loaded normal to the band axis. For high sensitivity, a bimetal band is used which comprises a non-magnetic carrier ribbon in addition to the magnetic ribbon. The sensitivity can be increased by increased thickness of the carrier ribbon. Further it can...
XVI IMEKO World Congress
· TC13
· 2000
· Download
P. Kumpulainen, T. Rahko, P. Laitila, E. Ojala, H. Ihalainen, P. Karma
Measurement of the transient evoked otoacoustic emissions (TEOAE) is widely used in research of hearing. In this paper we present a study on the timefrequency properties of TEOAE’s. The group under study consists of 257 children of age 14. Time-frequency features of the TEOAE’s are analysed. Examples of some typical results are presented. Relationship of the findings to earlier history of patients and benefits of TEOAE testing are discussed.
XVI IMEKO World Congress
· TC13
· 2000
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G. Jäger, R. Füßl, U. Gerhardt, K. D. Sommer
The exact measurement of the intraocular pressure is of great diagnostic importance in the field of ophthalmology. According to the international standard DIN EN ISO 8612, the tonometers being used are subject to strict type approval and, furthermore, must be checked on a regular basis. For calibration of one of the most widely used and most precise tonometers known as applanation tonometers usually a mechanical cross-beam balance is being employed at present. However, as the use of this type of test equipment requires a lot of time and yields test results of limited accuracy only, it does...
XVI IMEKO World Congress
· TC13
· 2000
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B. K. Juroszek
The spirometer is a measuring instrument which should give information about some mechanical parameters of the respiratory system in a synonymous and precise means. It consists of two main blocks: 1- the spirometric transducer, which converts non electric value, usually gas flow, into electric signal, 2- the electronic block, which measures, converts and presents the results. Their metrological parameters are usually tested by using a calibrating syringe, forced vital capacity simulator or standard waveforms gathered on a diskette. In this article the author proposes a new method of...
XVI IMEKO World Congress
· TC13
· 2000
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K. Futschik, H. Pfützner, N. Baumgartinger
Rapid detection of microorganisms in liquid samples by means of electric impedance measurements has become a world-wide applied hygienic standard method. A so-called raster electrode method, specifically adapted for measurements on microorganism cultures, yielded effective analyses of dielectric properties providing information on both the dielectric properties of the liquid culture medium and the properties of the inserted electrodes. Without the need of reference measurements of electrode characteristics, the method allows for the low frequency determination of a cell culture's...
XVI IMEKO World Congress
· TC13
· 2000
· Download