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Page 850 of 936 Results 8491 - 8500 of 9356

Yuri Chugui, Sergei Plotnikov, Anatoly Potashnikov, Alexander Verkhogliad
3D MEASURING TECHNOLOGIES FOR INDUSTRIAL AND SCIENTIFIC APPLICATIONS

The novel results of the R & D activity of TDI SIE SB RAS in the field of the optical measuring technologies, as well as laser technologies for solving safety problems are presented. To measure the rocks stress and to prevent the mountain impact, as well as for basic investigations, a set of optical-electronic deformers and systems was developed and produced. For permanent noncontact bearing position inspection of oil-drilling platforms on Sakhalin coast (Russia) we have developed optical-electronic method and system SAKHALIN. Multifunctional laser technological system LSP-2000 equipped by two Nd-YAG lasers was developed for cutting, welding and surface micro profiling with ablation process (working range of 3 x 2 x 0.6 m³, positioning error less than 10 mkm). Results of development and testing the specialized high productive laser measuring machine, based on structured illumination, for 3D inspection of grid spacers for Russian nuclear reactors with micron resolution are presented. Using high-speed laser noncontact method on the base of triangulation position sensors, TDI SIE has developed and produced automatic laser diagnostic system COMPLEX for inspection of geometric parameters of wheel pairs (train speed up to 60 km/hr.), which is used successfully on Russian railways.

Flávia Pompéia, Luiz A. P. Gusmão, Carlos R. Hall Barbosa, Elisabeth Costa Monteiro, Lídice A. P. Gonsalves, Fernando L. A. Machado
CHARACTERIZATION OF A MAGNETIC FIELD TRANSDUCER BASED ON THE GMI EFFECT

A magnetic field transducer based on the giant magnetoimpedance (GMI) effect has been developed by the Laboratory of Biometrology at PUC-Rio. It is aimed at biomedical applications, especially three-dimensional localization of needles accidentally inserted in the human body. This manuscript presents some new measurements that led to a better understanding of the prototype’s behavior.

Ireneusz Jabłoński, Janusz Mroczka
MEASUREMENT – MODELING, MODELING – MEASUREMENT: A TRANSITIVE COUPLE OF REALITY AND ABSTRACTION IN EQUIPAGE OF COMPREHENSION AND PREDICTION FOR EXAMPLE OF BREATHING CONTROL

The paper presents the problems of modeling and measurements in the medical sciences in the context of a dynamical system theory. Modeling can be seen here not only by the optics of a concrete object – system of breathing control, but first of all by the features of the tools used during reality reconstruction, which directly transfer to measurement procedure. The article is an introduction to a given research area.

Ireneusz Jablonski, Janusz Mroczka
INTRODUCTION TO RESPIRATORY MECHANICS MEASUREMENT BY ENHANCED INTERRUPTER METHOD

In the paper, there are postulated the basic requirements for the effective modification of a standard scheme of the interrupter technique (IT). The new method dedicated to respiration mechanics measurements, which meets such assumptions, is called enhanced interrupter technique (EIT). Using the idea of indirect measurements, it was showed by computer simulations the possibility to estimate the more number of parameters in EIT than in IT (only airway resistance Raw) for the proposed, modified Dubois’ model. EIT gives the higher accuracy and the reduced dispersion of the measurement results, at the same time. As it follows from the computer simulations, analysing the measurement data in the time domain and the use of as quick as possible occlusion valve (occlusion needs to include both the sudden, postocclusional transient states and the slow rise of the pressure at the mouth Pao) is essential to optimize EIT from the metrological point of view. The worked out problems are a base to construct a portable device, dedicated to measurement of the mechanical properties of the respiratory system.

T. M. Almeida, M. S. Piedade, P. C. Lopes, L. Sousa, J. Germano, F. Cardoso, H. A. Ferreira, P. P. Freitas
MAGNETORESISTIVE BIOSENSOR MODELLING FOR BIOMOLECULAR RECOGNITION

This paper presents the modelling of a magnetic biosensor included on a hand held microsystem based on a fully integrated magnetoresistive biochip for biomolecular recognition (DNA hybridisation, antibody antigen interaction, etc.). The biochip uses magnetic field arraying of magnetically tagged biomolecules and high sensitivity sensors which can be used to detect single or few biomolecules. The biosensor has an matrix-array structure and each biosensor site consists of a thin film diode in series with a magnetic tunnel junction. Schottky and pin diodes are used as temperature sensors and switching devices, although this paper specially emphasises pin diodes characterisation. A complete theoretical model characterising biosensor electrical, temperature and magnetic behaviour is derived and experimental results are provided.

T. Katsumata, H. Aizawa, Y. Kakinuma, E. Matashige, S. Komuro, T. Morikawa
TWO DIMENSIONAL PHOTOLUMINESCENCE IMAGING OF FOOD FOR NON-DESTRUCTIVE QUALITY CONTROL

Non-destructive evaluation technique of the foods including starches has been developed based on photoluminescence from starches in the foods. The visible PL with broad peak at wavelength of λ = 462 nm are observed from various foods including starches, such as polished rice, flour and corn starch, under illumination of ultra-violet (UV) light at λ = 365 nm. Peak intensity is found to vary with the source and the breed of the specimens. PL images from starches also reveal the uniformity of the food products. Two-dimensional images of PL, which revealed the uniformity of foods under UV irradiation, are potentially useful for the evaluation and the quality control of the foods and starchy products.

Vaclav Papez, Stanislava Papezova
INFLUENCE OF A MAGNETIC FIELD ON LIVING TISSUE

This paper describes a system, which enables quantitative monitoring and evaluation of the influence of a pulse magnetic field on a live organism by using of bioimpedance measurement. There are presented results of performed experiments.

Rodrigo P. B. da Costa-Felix, André Victor Alvarenga, Marissa A. Rivera Cardona
THE BRAZILIAN NATIONAL LABORATORY OF ULTRASOUND

Aiming to support the national metrology on ultrasound, Inmetro, the Brazilian National Institute of Metrology (NMI), has been putting effort on its Laboratory of Ultrasound (Labus). In a first approach, Labus is able to offer traceability in basically four general areas: Ultrasonic (US) Transducer Calibration, US Power Measurement, US Field Mapping, and Reference Materials Certification for US applications. The frequency range Labus firstly established its calibration and testing methods is from 0.5 MHz to 20 MHz, being the limits dependent on the particular application considered. So far, Labus most important facilities consist in two water tanks, three manuals and one complete remote-controlled micro-positioning systems, three equipments sets to generate and acquire US signals (arbitrary waveform generators and scopes-like instruments), a set of transducers and primary standards in Power Measurement (a stable US power source) and Hydrophone Calibration (two membrane hydrophones). For while, Labus is traced to others NMI, but the goal is to implement absolute calibration methods in two years time. Within this paper, Labus will be presented in details, particularly outlining its state of art in Transducer Calibration, Power Measurement, and Reference Materials Certification. Join ventures with industry and private and universities laboratories will be outlined, either.

Marissa A. Rivera Cardona, André Victor Alvarenga, Rodrigo P. B. da Costa-Felix
PRIMARY LEVEL ULTRASONIC OUTPUT POWER MEASUREMENT AT LABORATORY OF ULTRASOUND OF INMETRO

The primary level ultrasonic output power measurement service is being set up at the Laboratory of Ultrasound (Labus) of Inmetro, based on the standard IEC 61161. Labus´ main purpose is to provide support, in accordance with procedures developed by its services, to industry, to calibration laboratories, and to final consumers (patients, for instance). Labus’ clients will have means and necessary data to obtain, between other things, pre-market approvals of new models or equipment, laboratory accreditation, and on demand checks of equipment already being in use. These procedures will ensure optimized and safe use of ultrasound technology at all levels. This paper presents the main characteristics of Labus’ primary level ultrasonic output power measurement service.

Luís Pina Soares, Raul Carneiro Martins
NON-LINEAR FIT OF A 6 SKEWED GAUSSIAN TEMPLATE FOR FILTERING, COMPRESSION AND CLINICAL IDENTIFICATION OF THE ECG USING A DSP WIRELESS SETUP

In this paper we present an improved method for the acquisition, filtering, compression and clinical parameter identification of the ECG. The method involves the use of an improved instrumentation setup with high resolution and sample rate, as well as DSP monitored automatic gain and offset control (AGOC) which maximizes the range of the signal. It also involves the fitting of the signal with a nonlinear model consisting of six generalized Gaussians (with skew). The method further includes the use of sinefitting techniques to selectively remove electromagnetic interference such as the power-line (50 Hz or 60 Hz component). We will further describe the experimental setup developed, which is a DSP based portable 3-lead device, and show some experimental and characterization results.

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