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山田, 外史
概要:
Cancer is the most deadly disease in the world today. There is a variety of different treatment methods for cancer, incl
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uding radiotherapy and chemotherapy with anticancer drugs that have been in use over a long period of time. Hyperthermia is one of the cancer treatment methods that utilizes the property that cancer cells are more sensitive to temperature than normal cells. The control of temperature is an important task in achieving success using this treatment method. This paper reports the development of a novel needle-type nanosensor based on the spin-valve giant magnetoresistive (SV-GMR) technique to measure the magnetic flux density inside the body via pricking the needle. The sensor has been fabricated. The modeling and experimental results of flux density measurement have been reported. From the information of flux density, the temperature rise can be estimated to permit the delivery of controlled heating to precisely defined locations in controlled hyperthermia cancer treatment. The actual experiment with human is under investigation. © 2007, IEEE. All rights reserved.<br />Proceedings of the 1997 2nd International Conference on Power Electronics and Drive Systems, PEDS. Part 2 (of 2); Singapore, Singapore; ; 26 May 1997 through 29 May 1997; Code 47014
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山田, 外史 ; 岩原, 正吉
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This paper describes bare printed circuit board (PCB) inspection based on eddy-current testing (ECT) technique with high
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scanning speed. A high-frequency ECT probe composed of a meander coil as an exciting coil and the spin-valve giant magnetoresistance (SV-GMR) sensor was fabricated and is proposed. The ECT probe was designed based on crack inspection over flat surface, especially suitable for microdefect detection on high-density bare PCB. The ECT signal detected by the SV-GMR sensor was acquired by high-speed A/D converter for applying the signal processing based on digital technique. Harmonic analysis based on Fourier transform was used to analyze the ECT signal at fundamental frequency in order to increase inspection speed and this technique allowed the ECT probe to scan bare PCB, with high sampling frequency and with high-spatial resolution inspection. Experimental results verified the possibility and the performance of the proposed PCB inspection system based on ECT technique. © 2007 IEEE.<br />Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
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岩原, 正吉 ; 山田, 外史
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This paper reports on the development of a new horizontal-shaft hybrid-type magnetic bearing system. The bearing system
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will be used for a horizontal-shaft machine. The rotor is levitated due to the repulsive force between a stator and a rotor permanent magnet (PM). A lower cost and higher radial stiffness have been achieved by using a strontium-ferrite magnet on the rotor and an Nd-Fe-B PM above and below the rotor magnet. A finite-element analysis was performed to calculate the levitation force and radial stiffness. An upper stator magnet subtending an angle of 45° provides the best compromise between a large levitation force and radial stiffness. A model for the horizontal-shaft hybrid magnetic bearing system has been developed and includes the effect of the rotordynamics and the electromagnetic forces. An integral servocontroller was designed to stabilize the axial position. The controller has been implemented in a digital signal processor. Experimental results performed on a prototype system are in agreement with the theoretical results.<br />Third IEEE International Workshop on Electronic Design, Test and Applications, DELTA 2006; Kuala Lumpur; Malaysia; 17 January 2006 through 19 January 2006; Category numberP2500; Code 69206
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山田, 外史 ; 岩原, 正吉
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We present an eddy-current test (ECT) method for detecting conductive microbeads on a non-conductive substrate. A Helmho
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ltz coil is used to generate an exciting magnetic field. The magnetic fields, generated by eddy-currents in a Pb-Sn microbead, are detected by a spin-valve giant magnetoresistive (SV-GMR) sensor. The experimental results are compared to an analytical solution for the magnetic field over the microbead. Early results for the detection of a grid of microbeads are also presented. © 2005 IEEE.
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柿川, 真紀子 ; 山田, 外史
概要:
Miniaturization of electronic devices has making progress, resulting in smaller current flowing in extremely high-densit
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y LSI (large scale integration) or PCB (printed circuit board). However, measurements of such low local current have still been confronted with many difficulties because of the limitation on size of relatively large and cumbersome typical current sensors, lead to detecting general signals of a wide area. In this research, we propose the novel micron size and high sensitivity needle-type GMR probe in applications of non-contact measuring low currents coming from area narrower than 10-6 m2 with small signal crosstalk such as PCB current measurement and low bio magnetic signal detection. Low current of hundreds μA in high-density PCB tracks of 4×10-4 m pitch was measured with the signal crosstalk less than 10% and 5×10-6 A of nerve signal model was possible to be detected by micron size GMR probe.<br />Special Issue on the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics
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山田, 外史 ; 柿川, 真紀子
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Giant magnetostrictive actuator has potential for producing a huge stress and minute stroke unlike electromagnetic actuators using electromagnetic force. We proposed the powerful generation of cavitation in water medium driven by the
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actuator. The collapse of cavitation generates pulse shock wave and also brings about radicals generating by addition of titanium oxide. The previous researches show the generation of cavitation and radicals based on the methylene blue test method, and the destructive influence of both virus and bacteria was recognized. The paper proposes a new apparatus of a circulation type system to aim the large capacity, and discusses the evaluation of sterilization and inactivation quantitatively. And we observed the biological condition of the cell to check the biological effect after sterilization.<br />Special Issue on the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics
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山田, 外史
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The remanence remaining in a volcanic rock is one of important measurement data in geophysics field. The sample of a rock has the remnant magnetization up to 10-9 T. Generally the remote magnetic fields measured by SQUID gradiometer
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presume the remanence of a rock as a sample. We propose a new methodology by measuring a magnetic field inside a cylindrical hole in the rotating sample. We could develop the simple measurement without shield system and high sensitivity sensor. The paper described the measurement system and the measured results of the rock. We could measure the remanence of a volcanic stone quarried from the volcanic rocks at Mt.Aso, Japan. \n<br />Special Issue on the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM2014)
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山田, 外史 ; 池畑, 芳雄
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Induction heating type hyperthermia treatment, as one of cancer therapies, needs both high magnetic fields (> 2 mT) and a few hundred kHz inside of a body. We proposed the double-pancake type coil system sandwiching human body. The
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proposed exciting coils can generate magnetic fields with both magnitude and frequency required to a medical treatment, and also can adjust the distance between two flat coils according to the bodily proportions of a patient. In order to make magnetic fields inside a body further increase, a back yoke as magnetic materials is added to both coils. The paper discussed magnetic- and electrical-circuit characteristics of the exciting coil with a back yoke.<br />Special Issue on the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM2014)
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山田, 外史 ; 岩原, 正吉
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This paper has reported the performance of a tubular linear induction motor based on the principle of flux-concentration by eddy currents. In the developed Flux-Concentration type Linear Induction Motor (FCLIM) the key element is the
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conducting plate inserted between the exciting coils in each slot. In FCLIM the leakage flux is reduced and more flux is concentrated into the air gap . Thrust characteristics are compared using the equivalent circuit parameters and also verified experimentally. Some losses are occurred in the plate but the overall efficiency of the FCLIM is better at higher output force. The developed FCLIM is suitable for short linear motion and lower speed applications.
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山田, 外史 ; 岩原, 正吉
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Ferroresonance is a prolonged overvoltage condition that can damage transformers and other connected equipment. It can occur in the inductive voltage transformers as a result of the disconnecting of a busbar or a line section by
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opening circuit breakers equipped with grading capacitors. Ferroresonance creates highly distorted waveforms, which can cause abnormally high overvoltages. The level of overvoltages depends on the system parameters and the values of those parameters therefore need to be known. Such knowledge is possible either by means of practical experiments or by computer analyses. Due to the fact that it is not possible to do a lot of practical experiments in a real power system, the second possibility prevails. In this paper some outputs of analyses performed in the MATLAB and Simulink environment are shown and results are discussed.
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