著者

脇坂 俊幸 松嶋 徹 古賀 久雄 奥村 浩幸 桑原 伸夫 福本 幸弘

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.140, no.12, pp.557-564, 2020-12-01 (Released:2020-12-01)

参考文献数

30

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In this paper, the influence to electromagnetic environment was evaluated on the outside of buildings where power line communication (PLC) systems were installed to a three-wire three-phase power distribution line. The electric field strength was measured at 140 points in five factories, in two office buildings, and in one stadium. Since many radio waves existed in the environment, the electric field strength when PLC system was operated and was not operated was measured. The influence was evaluated by the cumulated occurrence probability because the frequency characteristics of the electric filed strength changed by the measurement points. The results showed that the occurrence probability was not changed when the PLC system was operated and was not operated. The electric field strength was calculated by the common mode current obtained from the test result, and this indicated that the occurrence probability was lower than the measured occurrence probability of electric field strength.

著者

鈴木 譽久 浅野 賢二 間宮 昇 渡部 浩志 堀 吉宏 内原 可治

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.118, no.6, pp.701-705, 1998

被引用文献数

1

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We have investigated a clock generated from a wobbled groove for higher density magneto-optical disk. Neither the readout signal nor the recording signal needs to include a clock element, because a clock derived from the wobbled groove is used for recording and readout. Therefore this clock does not depend on the quality of the readout signal. For this reason, a clock generated from the wobbled groove is effective for higher density recording.

著者

三木 恵 和田 淳

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.114, no.10, pp.727-728, 1994-09-20 (Released:2008-07-15)

参考文献数

3

著者

野坂 隆 増田 陽一郎

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.126, no.8, pp.821-829, 2006 (Released:2006-11-01)

参考文献数

20

被引用文献数

3 3

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To investigate the mechanism of the polarization fatigue of ferroelectric thin films, we analyzed the relationship between the crystalline defects of electrode/ferroelectric interface and fatigue characteristics of PZT thin films. Pt/PZT/Pt thin films were prepared by the chemical solution deposition method, and conditions of Pt/PZT interface were analyzed by TEM-EDX analysis, thermally stimulated current methods and I-V Properties. The PZT layers of about 30nm near the top Pt electrodes became an n-type due to the oxygen vacancies and they formed the contact similar to the top electrode of Pt/n-type PZT/p-type PZT. Because the height and width of the Schottky barrier in the Pt/PZT interface had reduced with the increase of the fatigue, this band structure was observed in the electric field where the Fowler-Nordheim currents were lower than usual. This is considered to be caused by the increase of crystalline defects near the interface due to the impressing of the bipolar pulse. This phenomenon was observed quantitatively by TSC analysis, and the TSC peak of 490K became larger with the increase of the fatigue. The activation energy of the TSC peak was 0.8ev and the defect density was 2.5×1019/cm3, which is consider to be produced by Pb defects.

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.140, no.12, pp.NL12_1-NL12_3, 2020

著者

土江 基夫 宮本 晃男

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.113, no.1, pp.39-42, 1993-01-20 (Released:2008-07-15)

参考文献数

9

被引用文献数

1

---

Solubility of copper in insulating oil depends on sulfur contents and component of insulating oil. As increasing of sulfur contents, the solubility of copper becomes large. When being added di-tert-butylparacrezole and benzotriazole into the insulating oil, solubility of copper becomes small. Evolution of combustible gas is proportional to amount of copper in insulating oil, and type of gas pattern due to results of gas analysis in insulating oil depends on chemical component of insulating oil. In the case of low aromatic content oil, hydrocarbon gas evolves preferentially, but in the case of high aromatic content oil, hydrogen gas evolves preferentially. Although degradation of the insulating oil is effected by solution of copper, breakdown voltage of insulating paper is not falling down.

著者

松村 太陽 小野 隆

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society (ISSN:03854205)

巻号頁・発行日

vol.132, no.10, pp.893-900, 2012-10-01

参考文献数

6

被引用文献数

1

---

At present, there are a variety of measures that are being taken in the face of the lengthening of level crossing closure times, but since these all rely on the intermittent detection of the location and speed of the train, they have not yet shown sufficient effectiveness. Against this backdrop, we will show in our simulation and experimental result the use of inductive wires to continuously detect the location of the train, while also outlining the crossing warning time control system, and how the application of this system. In this paper, warning time optimum control for level crossing with a continuous type train location detector using crossed inductive wires will be proposed and its effect to shorten crossing warning times will be discussed. And we have also confirmed the feasibility of the bidirectional information flow method. As a result, we have demonstrated that the proposed method is effective in delaying the timing of the initiation of warning and it is applicable to a high speed train.

著者

熊澤 孝夫 中川 渡 鶴丸 秀一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.125, no.10, pp.828-834, 2005

被引用文献数

6 9

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Bow-tie tree(BTT) generated from contaminant, <i>e.g.</i>, metal, carbon, amber(over cured resin) or void is a deterioration factor of XLPE cable. In particular, BTT in contact with inner or outer semi-conductive shield could significantly lower residual AC breakdown voltage of HV power cable. To evaluate influence of water and ion diffusion on generation and progress of BTT, we investigated relationship between water content of XLPE and the generation of BTT by various accelerated aging. The number of BTT in XLPE samples with accelerated aging under open condition, involving evaporation of water in which samples were immersed, was very large compared with closed condition. Furthermore, when samples were intermittently immersed in water, the number of BTT in samples was large compared with samples immersed continuously. In these experiments the generation of BTT seemed to have nothing to do with changes in water content before and after accelerated aging. Therefore, it was suggested that diffusion of ions rather than water in XLPE played an important role in the generation of BTT.

著者

藤崎 敬介 玉木 輝幸 安廣 祥一

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society (ISSN:03854205)

巻号頁・発行日

vol.129, no.11, pp.821-826, 2009-11-01

参考文献数

25

被引用文献数

2 1

---

The three-dimensional polycrystal magnetic field analysis method is compared with the distributed magnetic measurement. In the three-dimensional polycrystal magnetic field analysis method, the local coordinates are fixed in each crystal grain and the global coordinates are defined in the polycrystal steel. It is assumed that each crystal grain has the same magnetic characteristics as those of a single crystal grain. When it is applied to the real grain oriented (GO) steel with two crystal grains and with 56 crystal grains in 80-mm &times; 80-mm, and with 0.35 mm thick, their results of the magnetic flux density distribution and the inclination angle are mainly explained by &alpha; angle distribution of the polyctristal steel and seem to be in good agreement.

著者

田中 隆一 田村 直幸

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.100, no.3, pp.141-148, 1980-03-20 (Released:2008-06-30)

参考文献数

14

著者

前野 恭 高田 達雄

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.107, no.8, pp.395-401, 1987-08-20 (Released:2008-06-30)

参考文献数

12

被引用文献数

1 2

著者

菊地 光一 吉村 昇 能登 文敏

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.104, no.9, pp.517-524, 1984-09-20 (Released:2008-06-30)

参考文献数

20

被引用文献数

1 1

著者

細野 敏夫

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. A (ISSN:03854205)

巻号頁・発行日

vol.99, no.10, pp.494-500, 1979-10-20 (Released:2008-06-30)

参考文献数

7

被引用文献数

4 3

著者

中川 晶司 佐保 賢志 馬杉 正男

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.140, no.3, pp.169-170, 2020-03-01 (Released:2020-03-01)

参考文献数

7

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An analysis between the atmospheric state change and lightning discharges in the autumn (from Sep to Nov. 2011 and 2016) seasons in Japan is presented in this paper. In evaluating the number of lightning activities, we calculated SSI which is used to predict thunderstorms. We confirmed that the modified SSI for the winter season can be effective for evaluating the lighting activities in the autumn season, meaning that the lighting discharges in this season tend to be affected by the low-level atmospheric state condition.

著者

熊田 亜紀子 尾崎 浩一 清水 康広 日高 邦彦

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.121, no.7, pp.712-713, 2001-07-01 (Released:2008-07-15)

参考文献数

5

被引用文献数

1 1

著者

八代 健一郎

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.116, no.7, pp.579-585, 1996-06-20 (Released:2008-07-15)

参考文献数

42

著者

劉 源興 浦井 一 石井 彰三

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.113, no.1, pp.17-24, 1993-01-20 (Released:2008-07-15)

参考文献数

8

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X-ray radiation: bremsstrahlung and characteristic X-ray, in electron beam bombarded X-ray source is numerically analyzed with the Monte Carlo technique. In order to calculate the radiation, scattering processes such as bremsstrahlung, plasmon scattering, elastic collision, inner shell ionization, and secondary electron emmission are taken into account.The calculated relation between X-ray intensity and electron energy agrees with the experimental results reported by other groups. The intensity of bremsstrahlung has strong dependence on the angle because of absorption. The thickness of a foil target in which the X-ray intensity is maximized is smaller than electron mean range. Back scattered X-ray intensity in conventional X-ray tubes varies as the target angle. The peak of X-ray intensity angular dependence is obtained when the angle is 20°-40°.

著者

酒井 英男 小林 剛 泉 吉紀 中山 武 服部 克巳

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.136, no.5, pp.291-296, 2016

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Study of the electric self-potential (SP) and the magnetic field was conducted at the explosion seismic experiment in Ooyama, Toyama Prefecture. The explosion was induced by 450 kg gun powder placed at a depth of 32.2-75 m. The SP was measured by four electrodes arranged in a line crossing the explosion point, where the distance of each electrode from the explosion ranged from 10 to 100 m. Induced SP changes consisted of two portions, namely, fluctuations with shorter periods (∼10 ms) and fluctuations with longer periods (∼50 ms). Regarding the latter, the amplitude was in proportion to the span length of electrode couples and the fluctuations arrived faster at the electrode couples nearer to the explosion. Further, the increment of ground level in SP was observed in each electrode couple after the explosion, which was concordant with the distribution of apparent resistivity underground studied by the survey. The magnetic field measured by the fluxgate magnetometer at the site 35 m north from the explosion also showed change of a few nT after the explosion. This may have been caused by change of magnetic properties underground.

著者

笹田 一郎

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.121, no.12, pp.1062-1065, 2001-12-01 (Released:2008-07-15)

参考文献数

15

著者

松本 栄寿

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌A(基礎・材料・共通部門誌) (ISSN:03854205)

巻号頁・発行日

vol.117, no.7, pp.740-748, 1997-06-20 (Released:2008-07-15)

参考文献数

24

被引用文献数

1 1

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Analog Indicating Electrical Instruments were developed in the last half of the nineteenth century. Having searched for the source of precision readings in the measuring such as astrolabes, Tyco's quadrant or surveyng instruments which employed nonious scales, diagonal scales and micrometer driven scales in Europe, the US and Japan from the fourteenth century, the author found that Edward Weston in the US employed diagonal scales for the precision electrical meters.Through the reproduction of old hand-drawing method of Electrical Instruments Scales which have diagonal graduations, he concluded that the diagonal scales were the most appropriate measure for precision analog electrical meters.