International Journal of Applied Electromagnetics and Mechanics - Volume 14, issue 1-4

Authors: Harano, Hideki | Ito, Chikara | Watanabe, Kenichi | Iguchi, Tetsuo

Article Type: Research Article

Abstract: A series of experiments has been examined the applicability of RIMS to the trace xenon isotopic analysis needed for the tagging gas FFDL. The measurement of the JOYO cover gas equivalent clarified the existence of non-resonantly produced argon ions which could disturb the trace analysis. We proposed to apply the mass gating and solved the problem, which enabled us to succeed in demonstrating that RIMS satisfies the requirement for the FFDL at the MONJU.

DOI: 10.3233/JAE-2002-367

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 307-310, 2002

Authors: Tanimoto, Yoshifumi | Izumi, Syunsuke | Furuta, Koichi | Suzuki, Tomoe | Fujiwara, Yoshihisa | Fujiwara, Masao | Hirata, Toshifumi | Yamada, Sotoshi

Article Type: Research Article

Abstract: The effects of high magnetic field on Euglena gracilis Z were examined. When a horizontal magnetic field gradient (ca. 400 T^2 m^{-1} ) was applied, living E. gracilis moved to a higher field (positive magnetotaxis), whereas dead one gathered in a lower field. Magnetotaxis was not observed in a uniform magnetic field of 8 T. E. gracilis was oriented almost perpendicularly to the magnetic field regardless of life and death. Magnetotaxis of E. gracilis …would be explained by taking into account inhomogeneous magnetic forces on and magnetic orientation of E. gracilis. Show more

DOI: 10.3233/JAE-2002-401

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 311-316, 2002

Authors: Sakamoto, Naoya | Ohashi, Toshiro | Sato, Masaaki

Article Type: Research Article

Abstract: The effect of magnetic field on nitric oxide (NO) production of cultured human umbilical vein endothelial cells (HUVECs) was investigated. Static magnetic fields (30 mT, 300 mT) and an oscillating magnetic field (30 mT, 20 Hz) were applied to HUVECs for 0.5, 1 and 6 hours and intracellular NO was observed using a fluorescent indicator. There was no effect of the static magnetic field on the NO production of the HUVECs. In contrast, the NO production …increased with applying the oscillating magnetic field for 0.5 hour. However, such an increase of NO production was not observed for 1 and 6 hours. We performed a separate experiment to clarify the mechanism of NO synthesis by using an inhibitor of calcium-independent activation of NO synthase. The inhibitor suppressed the increase of NO production caused by the oscillating magnetic field. It can be concluded that oscillating magnetic field may activate calcium-independent pathway of activation for NO synthase. Show more

DOI: 10.3233/JAE-2002-403

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 317-322, 2002

Authors: Miyakawa, Tomokazu | Harada, Shin-ichi | Ishimori, Takayuki | Yamamoto, Hiroshi | Hosono, Ryuji | Yamada, Sotoshi

Article Type: Research Article

Abstract: Responses of the small heat shock protein gene, hsp-16, were examined in transgenic Caenorhabditis elegans exposed to extremly low frequency magnetic fields (ELFMFs). Expression of the hsp-16-lacZ gene was enhanced when transgenic animals were exposed to magnetic fields up to 0.5 T at 60 Hz. The hsp-16 promoter was more efficiently expressed at the embryonic than at the post-embryonic stage irrespective of exposure. Promoter activity was more sensitive to the stimulus in the intestine at the …post-embryonic stage. Evidence is presented that the induction occurs at the transcriptional step of hsp-16. Show more

DOI: 10.3233/JAE-2002-405

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 323-326, 2002

Authors: Iwasaka, M. | Ueno, S. | Shiokawa, K.

Article Type: Research Article

Abstract: In the present study, a possible influence of intense magnetic fields on cleavage patterns during the early embryonic development of frogs was studied. The early cleavages in Xenopus laevis were disordered by horizontal magnetic fields of 10 T order. However, the magnetic field effect did not remain until when they become tadpoles.

DOI: 10.3233/JAE-2002-412

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 327-330, 2002

Authors: Nafalski, Andrew | Roy, Nirmal | Göl, Özdemir

Article Type: Research Article

Abstract: Modelling and prediction of magnetic fields in the vicinity of electrical power lines is an important contribution of electrical engineering to the clarification of uncertainty of the effects of low intensity magnetic fields on the living environment. The paper reports on investigations that use neural networks for the prediction of magnetic fields from power lines. Additional consideration is given to the lateral profile of magnetic fields as a result of asymmetry of the load in transmission …and distribution lines. Results of both assessments can be used in epidemiological and other studies. Show more

DOI: 10.3233/JAE-2002-407

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 331-335, 2002

Authors: Kanda, Hiroyuki | Watanabe, Masami | Fujikado, Takashi | Yagi, Tohru

Article Type: Research Article

Abstract: In a visual prosthesis, the visual nervous system of blind people are stimulated electrically in order to reconstruct their sense of sight. However electrical power supply to an internal device is limited. Therefore, it is very important to study efficient electrical stimulation. In our study, various pulse types were applied to the lateral geniculate nucleus (LGN) to record the neural responses from the visual cortex (V1) of cats. Experimental results revealed that the inversion of polarity …of electric current pulse was effective in electrical stimulation to the LGN. Show more

DOI: 10.3233/JAE-2002-410

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 337-340, 2002

Authors: Huang, Shiann-fong | Iramina, Keiji | Yumoto, Masato | Ueno, Shoogo

Article Type: Research Article

Abstract: In this study, we are interested in the endogenous negativity of the earlier negative component (designated NA) for observing some aspects of cognitive processes. We recorded the visual NA magnetic field with a 204-channel whole-scalp SQUID gradiometer and estimated the equivalent current dipoles (ECD) to clarify the source localization of NA. Visual evoked magnetic fields (EMFs) were recorded during a simple response task (SRT) and a discriminative response task (DRT) to examine the endogenous negative …component, NA. The characters of the NA curves for all subjects were the same [1]. The ECD sources for one subject were localized in the parietal section of the brain. Our data suggest the possibility of visual NA research in evoked magnetic fields. Show more

DOI: 10.3233/JAE-2002-409

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 341-346, 2002

Authors: Ito, Yuichiro | Yagi, Tohru | Ohnishi, Yasushi | Kiuchi, Kazutoshi | Uchikawa, Yoshiki

Article Type: Research Article

Abstract: The purpose of this study is to develop an implantable micro-electrode array, which is made of the conductive polymer, polypyrrole (PPy). For that purpose, we tried to fabricate micro-patterns of PPy using the photochemical reaction of oxidative polymerization agents. Moreover, the conductivity of the micro-pattern was evaluated in terms of pattern width, length and polymerization time. Experimental results showed that we could fabricate the micro-patterns, which had a line width of 3 …μm. This size was small enough for the purpose mentioned above. In addition, the conductivities of the micro-patterns were proportional to their width and length, and could be improved by suitable polymerization time. These results showed that the micro-patterns seemed to be applicable to a neural stimulating electrode. Show more

DOI: 10.3233/JAE-2002-498

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 347-352, 2002

Authors: Funase, Arao | Yagi, Tohru | Barros, Allan K. | Kuno, Yoshiaki | Uchikawa, Yoshiki

Article Type: Research Article

Abstract: The purpose of our study is to analyze the relationship between the fast eye movements, i.e., "saccade", and the electroencephalogram (EEG). The recorded EEG during saccade was analyzed with the independent component analysis (ICA) method. During visually guided saccade experiments, we observed a sharp change of the ICA signals more frequently immediately before eye movement than at other peak point of reference signals, while this was not the case under the condition of no eye movement. …These results indicate that the phenomenon of signal change is possibly related to the motion processing of saccade, or to the attention to the visual stimulus. Show more

DOI: 10.3233/JAE-2002-518

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 14, no. 1-4, pp. 353-358, 2002