Improvement of measuring accuracy of magnetic field strength in single sheet testers by using two H coils

The accuracy of the measured magnetic field strength of single sheet testers using an H coil[1-4] is examined by finite element analysis. An improved measuring method which uses two H coils is proposed from this investigation. It is clarified that the best measuring method of magnetic field strength is the improved two H coil method. The validity of the new method is confirmed by experiments. </p

Improvements of single sheet testers for measurement of 2-D magnetic properties up to high flux density

Due to structural limitation, the currently proposed apparatus based on a single sheet tester (SST) cannot measure magnetic properties along arbitrary directions (so-called 2-D magnetic properties) of silicon steel at high flux densities. In this paper, significant improvements are carried out on magnetizing windings and auxiliary yokes of a double excitation type of SST. Furthermore, crosswise overlapped H-coils are introduced so that even an ordinary single-excitation type of SST can be applicable to the measurements of 2-D properties. It is demonstrated that 2-D magnetization property up to 1.9 T can be measured by using the newly developed SST's</p

A New Application of Transient Recorder to Magnetic Measurements (Part I: Core Loss Measurement at Very Low Frequencies)

A new method have been developed based upon analogue-to-digital conversion techniques and memories. The method involves the scaling of operating frequency from "real" to "optimum" for the power loss measurement. The advantages of using this techniques are as follows: (1) extreme availability at lower frequency region, (2) high accuracy and high stability, (3) simple measuring procedure, (4) digital indication. This method can be measured the power losses over the frequency range 0.1Hz to 1kHz for magnetic circuit and d.c. to 1kHz in such a purely resistive circuit. We estimate the accuracy of this core loss measuring system within 1.0% over all these frequency range. Using this system, specific core losses of the various grades of silicon iron have been measured in the frequency range 0.1Hz to 200Hz

Experimental Studies of Various Factors Affecting Minor Loop Hysteresis Loss

When the distorted flux is induced in a magnetic circuit, the minor loops arise sometimes inside the major hysteresis loop. The area, accordingly the hysteresis loss of the minor loop,is affected by its amplitude and position, by the maximum flux density, by the quality of material, etc.. In this paper, we describe the experimental studies of the factors on the minor loop hysteresis loss. A method of getting the displacement factor of a minor loop which is placed at arbitrary position and has any amplitude is developed from our experimental results. Using this method, the core losses caused by the distorted flux can be calcuLated within the error less than three percent, even if the amplitude of the minor loop becomes near to the amplitude of the major loop

Electro-optical response of reflected light from freely suspended smectic liquid-crystal films

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Kazuyuki Nakano, Masanori Ozaki, and Katsumi Yoshino, Journal of Applied Physics 92, 6384 (2002) and may be found at https://doi.org/10.1063/1.1518761

ライフ ステージ ニ オウジタ キノウテキ コウクウ ケア : シカ エイセイシ ガ ヒラク ケンコウ チョウジュ シャカイ エノ トビラ

In population ageing society the prevention of oral infection disease and the maintenance of chewing function are very important to contribute to enhance the quality of life of individuals and to manifest a healthy long life society in the future. Generally oral care means hygienic oral care to prevent dental disease. On the other hand the term of functional oral care is used as the rehabilitation training to the chewing and swallowing disorders or MFT (Myofunctional therapy) in the orthodontic treatment. I propose to include chewing and nutritious support, and instruction of self care on the posture and oral habits in the term of functional oral care. In this paper I focus on the functional oral care in the life stages and the participation of dental staffs, particularly oral hygienists in the field