著者

関野 正樹

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.133, no.3, pp.NL3_2-NL3_2, 2013-03-01 (Released:2013-03-01)

著者

山田 昭彦

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.1, pp.32-38, 2001-01-01 (Released:2008-07-15)

参考文献数

51

---

Research and development of electronic computers started in late 40's in Japan. After the invention of transistors in the US and parametrons in Japan, laboratories and manufacturers started developing computers using transistors or parametrons as logical elements. Therefore only four vacuum tube computers were manufactured in Japan. These are Electronic Computer at Osaka University, FUJIC of Fuji Photo Film Company, TAC of University of Tokyo and ECL RTC. Though the first generation of computers was rather short in Japan, the technical contribution of the development of vacuum tube computers is valuable. This paper reviews the development efforts of the former two vacuum tube computers, Osaka University's and FUJIC.

著者

長山 好夫

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.123, no.4, pp.323-328, 2003 (Released:2003-07-01)

参考文献数

22

---

The tokamak with the aspect ratio less than 2 is called spherical tokamak (ST), since the plasma is naturally elongated and has a spherical shape. It is being theoretically and experimentally shown that ST has a high potential to confine the very high beta plasma (beta=plasma pressure/magnetic pressure). The blanket module can be easily replaced in ST. If the internal transport barrier and the high bootstrap current fraction are established in ST, the economical fusion reactor would be more realistic.

著者

Yoshihito Yagyu Satoshi Tsuji Saburoh Satoh Chobei Yamabe

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.125, no.8, pp.656-662, 2005 (Released:2005-11-01)

参考文献数

13

被引用文献数

1

---

The apple snail, Pomacea canaliculata, brought to Japan from Taiwan for human consumption in the 1980s, has come to be considered as deleterious for rice cultivation. The snail is unable to injure young rice plants while receiving electric shock because the snail retracts its entire body into its shell and shuts its aperture with its operculum. Electric shock should be applied intermittently to reduce the amount of energy that is wasted when the snail is in its shell made of one of the insulator. The minimum electric shock required for controlling snails and the time required for movement after application of electric shock to determine the frequency of each electric shock were investigated using two methods; vertical and horizontal application of the electrical stimulation. The results showed that there is a strong correlation between the strength of electric shock and the reaction of the snails, and electric shock made snails inactive when it was applied 0.35 A/m2 in the horizontal direction and 0.45 A/m2 in the vertical direction with water of 11 mS/m. A positive correlation was also found between electric shock and the reaction of the snails and shell height. In comparison with larger snails, the smaller snails had higher threshold levels against electric current density because their shorter feet tended to have lower voltage dorp. Moreover, the frequency of electric shock should be chosen the minimum duration for the inactive condition, and it was approximately 10 seconds. Consequently the direction of electric current should be in the horizontal direction above 0.35 A/m2 and the frequency of electric shock should be less than 10 seconds for practical use. However, electric shock would have to be maintained at greater than 0.35 A/m2 because snails might become habituated to electric shock and water in paddy field would have high electric conductivity.

著者

鷹野 敏明 山口 潤 阿部 英二 二葉 健一 横手 慎一 河村 洋平 高村 民雄 熊谷 博 大野 裕一 中西 裕治 中島 映至

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.128, no.4, pp.257-262, 2008-04-01 (Released:2008-04-01)

参考文献数

7

被引用文献数

4 6

---

We developed a cloud profiling radar, named FALCON-I, transmitting frequency-modulated continuous wave (FM-CW) at 95 GHz for high sensitivity and high spatial resolution ground-based observations. Millimeter wave at 95 GHz is used to realize high sensitivity to small cloud particles. An FM-CW type radar realizes similar sensitivity with much smaller output power to a pulse type radar. Two 1m-diameter parabolic antennas separated by 1.4m each other are used for transmitting and receiving the wave. The direction of the antennas is fixed at the zenith at this moment. The radar can observe clouds up to 20 km in height with a resolution of 9 m. Beam size of the antenna is as small as 0.2 degree of arc, which corresponds to 15 m at the range of 5 km. Observation results showed that the sensitivity of -34 dBZ is realized at 5 km in range, and good spatial resolutions.

著者

勝野 泰 河崎 善一郎 松浦 虔士

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.111, no.5, pp.496-497, 1991-05-20 (Released:2008-07-15)

参考文献数

5

著者

渡辺 和也

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.1, pp.20-24, 2001-01-01 (Released:2008-07-15)

参考文献数

22

---

The Senju (Thermal) Power Station was constructed by the Tokyo Electric Light Company in 1925 as an auxiliary/emergency plant that supplements the needs of the hydroelectric power plants.Since 1929, the company has successfully operated three 25, 000 kVA Turbo-Generators as synchronous condensers at the Senju Power Station. The generators at the Senju Station produce electrical energy for half of the year.For the remaining half of the year, they are disconnected from turbines and run as synchronous condensers. Used this way, these machines perform double duty. One reason for this arrangement was that the greater capacity of the synchronous condenser was required for the high water season.A second was economic benefits.After the success of the Senju Station, more than 40 utility Turbo-Generators in Japan were altered for use as synchronous condensers, and others were designed and constructed specifically for this purpose. The use of Turbo-Generators as synchronous condensers was an original development of the Japanese electric power companies.This note provides an overview of alterations made to the generators at the Senju Station.

著者

和氣 加奈子 田中 利幸 川澄 正史 多氣 昌生

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.7-8, pp.806-811, 1998-07-01 (Released:2008-07-15)

参考文献数

15

被引用文献数

2

---

Induced current density in human head involved in generation of magnetophosphenes is estimated by numerical analysis using the impedance method to gain insight into the mechanism of magnetophosphenes. Complex shape and electrical heterogeneity of real human head are considered and a magnetic field which can cause magnetophosphenes is used. Calculated current density distributes throughout the head and is relatively high around nose and eyes. Induced current density distribution on retina is higher in the upper and lower parts than in the central part, which is consistent with experimental observations. Maximum induced current density at retina is estimated about 11mA/m2.

著者

佐伯 拓 谷口 誠治 中村 和広 飯田 幸雄

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.135, no.10, pp.559-564, 2015-10-01 (Released:2015-10-01)

参考文献数

19

---

An energy cycle using solar power and metals has been proposed. High repetitive laser pulses are generated by a solar-pumped laser or a laser generated using solar power, and the laser pulses are irradiated to metal oxides in liquid. We can obtain reduced metal nanoparticles with this method, and solar power is effectively stored as chemical energy. We fabricated Li air fuel cells using sintered Iron or Aluminum nanopaste plates as negative electrodes. Electricity was successfully produced from these cells. The observed maximum output voltage of the Al paste Li air cell was 2.9 V when they were connected to a low load. The Fe or Al paste Li air cells are expected to become common power supplies with high-energy density and high output power.

著者

久野 古夫 亀本 一廣

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.124, no.8, pp.695-704, 2004 (Released:2004-11-01)

参考文献数

29

被引用文献数

2 1

---

The report provides a relevant explanation about the advance of the television technology, especially about the systems and the receivers, from the beginning of the television development. (1) From the beginning of TV development to World War II. (2) Resumption of TV development by the end of war. (3) Monochrome TV to color TV. (4) Television technology in New Media, Multimedia and IT era.

著者

早乙女 英夫 川越 博幸 栗田 直幸

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.138, no.12, pp.592-598, 2018

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<p>In this paper, recent topics of low loss technologies of magnetic components for high frequency power converters are discussed. We mainly describe the equivalent circuit model for the ferrite inductor considering high-frequency magnetic loss, new magnetic material technologies for the magnetic components to reduce the loss, and the loss-reduced design technology of high-frequency transformers for the isolated DC-DC converter.</p>

著者

後藤 太一 井上 光輝

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.141, no.5, pp.327-332, 2021-05-01 (Released:2021-05-01)

参考文献数

28

---

Spin-wave integrated circuit using magnetic garnet films attract many interests because of their low Joule heating as well as the wide range of tunability of the wavelength. In this circuit, the phase interference of spin waves plays an important role to show functions. Hence, the control of phase and magnitude of spin waves is an essential technique to realize spin-wave integrated circuits. To control the phase and magnitude of spin waves, we fabricated magnonic crystals using metal periodic structures fabricated on magnetic garnet films. Forward volume spin waves propagated through the magnonic crystal and showed a magnonic bandgap. In this paper, the designing of the magnonic crystal using finite integration technique (FIT) and fabrication of samples using etching were also described.

著者

山崎 健一 河本 正 藤波 秀雄 重光 司

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.120, no.3, pp.369-370, 2000-03-01 (Released:2008-07-15)

参考文献数

19

被引用文献数

2

---

Estimation of induced current inside a human body exposed to ELF (extremely low frequency) magnetic field are still remaining as an important issue. There are many computational studies reporting the relationship between outer magnetic filed and induced current inside the human body. In addition, there are some limit values regarding human exposure to magnetic field based on the induced current density. Here, we investigated and compared the relationship between magnetic field and induced current among existing literatures and guidelines. The result showed that each estimated value of magnetically induced current varied widely.

著者

芹川 正 白井 誠一

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.110, no.10, pp.675-678, 1990-10-20 (Released:2008-07-15)

参考文献数

10

著者

廣田 憲之 北沢 宏一

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.9, pp.769-776, 1996-08-20 (Released:2008-07-15)

参考文献数

38

被引用文献数

1 1

著者

中野 美香 高原 健爾 梶原 寿了

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.129, no.5, pp.379-385, 2009-05-01 (Released:2009-05-01)

参考文献数

6

被引用文献数

7 3

---

This paper describes the instructional design to develop communication ability for students in the electrical engineering majors. It is based on the case of Fukuoka Institute of Technology which started new courses for communication skills in 2007. A series of communication education from the freshman year to the third grade is systematized, considering the developmental process of students' argumentation. In the classes, students continually learn dialogue and cooperation through various styles of discussion, debate, presentation and so on. The first introductory class of all is “Communication Theory I”, which is aimed at developing self-awareness and improving discussion skills for interpersonal relationship. In this course, students acquire skills to construct their arguments about the given issues and to evaluate others' presentation performances each other. To cultivate students' communication ability, education should not be closed in a class, but support system from departmental level is essential.

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.142, no.5, pp.NL5_1-NL5_4, 2022-05-01 (Released:2022-05-01)

著者

Masashi Hayakawa

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.126, no.4, pp.211-214, 2006 (Released:2006-07-01)

参考文献数

5

被引用文献数

3 10

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Electromagnetic phenomena are recently found to take place prior to an earhquake, and they are regarded as the most promising candidate for short-term earthquake prediction. This report reviews the recent findings on seismo electromagnetic phenomena, including ULF emissions, seismo-atmospheric and -ionospheric perturebations, Earth's surface temperature anomaly, in-situ observational results etc.

著者

小川 恭孝 伊藤 精彦

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.116, no.8, pp.671-677, 1996-07-20 (Released:2008-07-15)

参考文献数

18

被引用文献数

2

著者

重松 征史

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.110, no.4, pp.267-274, 1990-04-20 (Released:2008-07-15)

参考文献数

15

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Neural mechanism of the retina may perform the principal role of luminosity transformation. In this paper, non-linearity of the Munsell value function was discussed on the physiological basis. Amplitude response function of the retinal neurons is approximated as a sigmoidal one V=Vmax•X/(X+S). This function may more essentially express the visual process, because it could be shown that this function includes parts well fitting to the well known psychological response functions, Weber-Fechner and Steven's law.Introducing an idea of neural adaptation to this function, the Munsell value function can be more precisely approximated. The conclusive equations were expressed as V=Vmax•X/{X+S(X)} and S(X)=X0{1+5.55•X/(X+1.8•X0)}, where X0 was background light intensity or refrectance, and X was test light one. This equation means that the adaptation level S(X) varied with two components, groval intensity (X0) and local one (X).