O. Posth, M. F. Hansen, U. Steinhoff, L. Bogart, P. Southern, P. Svedlindh, C. Grüttner, L. Fernández Barquin, W. Szczerba, F. Ludwig, N. Gehrke, O. Kazakova, C. Johansson
CLASSIFICATION OF ANALYSIS METHODS FOR CHARACTERIZATION OF MAGNETIC NANOPARTICLE PROPERTIES

The aim of this paper is to provide a roadmap for the standardization of magnetic nanoparticle (MNP) characterization. We have assessed common MNP analysis techniques under various criteria in order to define the methods that can be used as either standard techniques for magnetic particle characterization or those that can be used to obtain a comprehensive picture of a MNP system. This classification is the first step on the way to develop standards for nanoparticle characterization.

Patchariya Petchpong, Yong Tae Kim
DESIGN AND FABRICATION OF 1 MHZ ULTRASONIC TRANSDUCER FOR TRANSFER STANDARD AT NIMT

The fabrication of a single element transducer made from Lithium Niobate (LiNbO₃) operating at 1 MHz to 10 MHz is focused on this paper. The air-backed immersion type LiNbO₃ transducer is developed to be used as the standard transfer ultrasonic transducer to calibrate the ultrasound power-meter, which is measured the total emitted acoustic power radiated from the medical equipment. To clarify the precision of the acoustic power, the primary standard calibration measurement (radiation force balance, RFB) based on IEC 61161 is used to investigate the fabricated transducer. The geometry of the piezoelectric active element was firstly designed by the prediction of the Krimholtz, Leedom, and Matthaei (KLM) simulation transducer technique. The electrical impedance measurements of the LiNbO₃ element, before and after assembling into the transducer, were checked and compared. The results of electrical impedance show that the operating frequency is in the range from 1 MHz to 10 MHz by forming harmonics. The evaluations of total emitted power and radiation conductance of fabricated transducer were also revealed. Results of acoustic power have been responding up to 2.1 watts, which can be assessed within 6% of measurement uncertainty.

Andrzej Miękina, Paweł Mazurek, Roman Z. Morawski
SPECTRUM-DOMAIN VS. TIME-DOMAIN ESTIMATION OF ECHO PARAMETERS IN IMPULSE RADAR SYSTEMS FOR MONITORING OF HUMAN MOVEMENTS

The research reported in this paper is related to the ultra-wide-band radar technology that may be employed in care services for the elderly. Two algorithms for preprocessing of measurement data from an impulse radar sensor are compared with respect to the uncertainty of estimation of echo parameters. These are: an algorithm based on curve-fitting in the spectrum domain and a modified CLEAN algorithm. Preliminary results of numerical experiments performed on those algorithms are demonstrated.

Yongbum Lee, Mieko Uchiyama, Tomoko Sumiyoshi, Takeshi Hara
MEASUREMENT OF PUPIL SIZE DURING MAMMOGRAPHY

Many women feel the physical burden during mammography as pain. We examined the pain-related pupil dilation response during mammography. The pupil sizes of 24 women were measured during mammography excluding x-ray irradiation. Their mean pupil diameter was 2.9 mm in relaxation phase before mammography, while it was 3.2 mm in a few seconds after breast compression. The difference in pupil diameter between the relaxation and pressure phases was statistically significant.

Asli G. Bulutsuz, M. Emin Yurci, Malgorzata Lewandowska
INFLUENCE OF SEVERE PLASTIC DEFORMATION ON TI13NB13ZR SURFACE MORPHOLOGY

In this study surface behaviour of sand blasted and acid etched ultra-fine grained Ti13Zr13Nb specimens were investigated. Surface characters are a crucial factor that effect osseointegration performance of implants. Ti13Nb13Zr specimens were processed by means of hydrostatic extrusion technique. The effect of the grain size and surface modification on the surface roughness and topography were systematically investigated with stylus-profilometer and scanning electron microscope.