著者

山田 昭彦

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.720-726, 2004 (Released:2004-11-01)

参考文献数

16

---

Switching theory was developed as a theory for relay circuits in early days. In September 1935 Akira Nakashima of NEC delivered his invited speech on synthesis theory of relay networks including de Morgan’s theorem at the technical meeting of the Telegraph and Telephone Society in Tokyo. Since 1934 he had published his ideas in a series of papers “Theory and practice of relay circuits." Akira Nakashima and Masao Hanzawa formulated the design method for switching networks by using algebra in 1936. This is the first paper on switching theory that was applied to the analysis of digital circuits. It was in 1938 that the paper on switching theory was published by Claude E. Shannon. Following Nakashima’s research Kan-ichi Ohashi, Mochinori Goto and Yasuo Komamiya of Electrotechnical Laboratory (ETL) extended the theory to apply to sequential circuits.

著者

原 雅則 末廣 純也 山本 謙治郎

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.111, no.5, pp.440-445, 1991-05-20 (Released:2008-07-15)

参考文献数

12

---

DC corona discharge in gaseous helium under non-uniform electric fields down to 4.2K at atmospheric pressure has been investigated. Although helium is a non-electro negative gas, a negative pulse corona is observed only near the normal boiling point and then negative breakdown voltage increases remarkably. Positive ion space charge modifies the electric field distribution in the gap space considerably. Criteria for corona inception and positive breakdown preceded by corona are proposed, and their availability is confirmed experimentally. The electric field strength, corona current density and space charge density are measured successfully and are analyzed theoretically using a bias probe method and a numerical field calculation technique. Apparent mobilities of charge carriers generated by positive and negative corona discharge are obtained with these discharge parameters. As a result, it is suggested that major ion species in positive corona is He+, and that an electronic bubble plays an important role in the negative pulse corona development near the normal boiling Point.

著者

柳父 悟

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.6, pp.396-402, 2009-06-01 (Released:2009-06-01)

参考文献数

6

被引用文献数

2

---

Japan modernization was very rapidly promoted about 200 years ago. Before that time Japan had national isolation policy but the emperor at that time and the worrier who led society realized that Japan should develop quickly to compete with the US and European countries.Compared with other power stations, the construction of the Keage Hydroelectric Power Station was somewhat delayed, but it was achieved during the development of the Biwako Sosui (Lake Biwa Canal) Project and was the first hydroelectric power generation station for public service in Japan. We can see the history of the development of technology in the world by looking at Keage as it sequentially adopted new technology during its construction.

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.1, pp.NL1_3, 2020-01-01 (Released:2020-01-01)

著者

加藤 正平

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.105, no.8, pp.429-436, 1985-08-20 (Released:2008-06-30)

参考文献数

14

著者

鈴木 智一 Muaffaq Achmad Jani 工藤 昭一 高木 浩一 加藤 昭二 藤原 民也

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.119, no.1, pp.13-18, 1999-01-01 (Released:2008-07-15)

参考文献数

15

被引用文献数

2 2

---

Analysis of NOx removal by a discharge plasma is made with an equivalent circuit. The used NOx reduction system consists of a neon transformer and a plasma reactor based on a dielectric barrier discharge. Impedance of the neon transformer has been determined experimentally, The equivalent circuit based on a series connection of two capacitors is used for the plasma reactor. The capacitances are obtained from experimental V-Q Lissajous diagram. Comparison with experimental data of consumed energy and the dependence of NO removal on gap length is successfully done.

著者

渡邊 昇五 佐藤 愛実 王 祁 山崎 亨

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.115, no.8, pp.737-743, 1995-07-20 (Released:2008-07-15)

参考文献数

6

被引用文献数

1 1

---

A digitized phase sensitive detecting system(DPD)have been developed for precision measurement of voltage ratio. The system is composed of a personal computer, an analog-to-digital converter(ADC)and a software for mesurement and data treatment. Two sinusoidal voltages of a frequency applied to the DPD are converted into discrete data, and expressed as vectors by data treatment following to the principle of usual phase sensitive detector. Then an amplitude ratio and a phase difference of the two input voltages are calculated. Estimeted uncertainties of measured values by the DPD are less than 0.008[%]for amplitude ratio and 0.05 [mrad] for any phase difference at frequency of 50[Hz].The errors of the DPD caused by harmonic distortion of the applied voltages and asynchronus sampling by the ADC are also examined using a two-phase voltage source.

著者

宮下 克己 鎌田 圀尚 酒井 修二 田中 浩樹

出版者

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.115, no.3, pp.257-264, 1995-02-20

参考文献数

12

著者

高橋 信明 杉本 諭 岡田 益男 本間 基文

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.113, no.4, pp.251-260, 1993

被引用文献数

1 6

---

Present work describes the magnetic properties of Nd-Fe-B melt-spun ribbons which have lower Nd content than the Nd₂Fe₁₄B compound. The studied alloys were (1) Nd_xFe_94-xB₆, (2) (Fe₃B)_1-x-(Nd₂Fe₁₄B)_x and (3) Fe_1-x-(Nd₂Fe₁₄B)_x. The grain refinement were underwent by studying the conditions of annealing for crystallization. It results in disappearing noticeable knicks in the demagnetization curves, which is attributed to precipitations of &alpha;-Fe and Fe₃B phases. The Nd₈Fe₈₆B₆ melt-spun ribbon annealed at 650&deg;C for 30 min exhibits the highest (<i>BH</i>)_max of 126kJm^-3(15.8MGOe). The V addition is effective for improving the coercivity.

著者

高原 健爾 中野 美香 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 = 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.130, no.1, pp.87-94, 2010-01-01

参考文献数

18

被引用文献数

8 4

---

The purpose of this study is to suggest the communication education for students in the science and engineering majors. The main characteristic of the curriculum is the process of value and attitude changes of students by debate. It is effective to cultivate well-balanced manner and matter which take significant role in any communication. The lectures provide debate training to match the proficiency of the students in order to foster thinking ability step-by-step. In the department of electrical engineering of Fukuoka Institute of the Technology, the expert of the communication and the expert of the electrical engineering team-teach the course as one of the specialized subjects. This system provides both training of technique of constructing argument and professional assessment on their contents, which it calls &ldquo;two wheels of one cart&rdquo;. The lectures are organized to develop students' incentive to learn with ARCS model. The questionnaires show that the communication skills acquired through debates are applied in the scenes of the real problem solving. 90% of the students reply that the series of lectures are useful and produce satisfactory results. Therefore, the proposed education is confirmed to be effective to enhance the communication skills of students.

著者

廣 三壽 藤井 治久

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.8, pp.805-812, 1997-07-20 (Released:2008-07-15)

参考文献数

13

被引用文献数

2 4

---

We investigated the electrostatic charging phenomena of polymer films used for the thermal control materials of spacecrafts by electron-beam irradiation simulating the hot plasma in space. Three kinds of polymer films, Teflon FEP (flurinated ethylene-propylene), Kapton PI (poly imide) and Mylar PET (poly ethylene telephthalate) of the thickness of 13-75μm, were tested under the irradiation conditions of the electron energy E lower than 50keV and the beam current density Jb lower than 1nA/cm2. The surface potentials Vs of the films were obtained as functions of E and Jb at the constant irradiation time.The obtained experimental results are as follows.(1) Vs increases with increase of Jb. When Vs∞Jbn is assumed, the n value is different during the films: n=1 for FEP film, n_??_0.5 for PI film and 0.5_??_n_??_0.8 for PET film.(2) In Vs-E characteristics, Vs has the peak at some electron energy which is dependent on the material and the thickness.These results were explained by an one-dimensional charging model in which one charge deposition layer is assumed to be formed in the bulk of the film and the volume resistivity and the secondary electron emission coefficient of the material are considered.

著者

伊藤 亮太 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.134, no.6, pp.434-435, 2014

---

This paper describes an analysis of the effects of transient electromagnetic fields on bioelectric potential responses of plant leaves. In our experiment, a single transient electromagnetic field was periodically applied to aloe and pachira for 3 days. The pulse application cycle was set to 1 time per 1 day with charging voltage of 20kV. After the pulse application, we measured bioelectric potential of target leaves for 12 hours. As a result, we found that bioelectric potential energy was increased by application of transient electromagnetic fields.

著者

田口 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.136, no.7, pp.421-426, 2016

---

It is well-known that concentration of generated ozone by ozone generator with dielectric barrier discharge (DBD) using high purity oxygen as a fed gas is decreased with time. The phenomenon is called "Ozone Zero Phenomenon" (OZP). As one of factors responsible for occurrence of this phenomenon is speculated to be an influence from electrode surface, we have focused our investigation on electrode surface heating generated by electrical discharge. In this paper, we studied the behavior of thermal decomposition ozone flowing ozone into the heated stainless steel pipe, and examined the temporal change of the decomposition rate of ozone. In the results, when ozone decomposition in stainless steel pipe that have not been exposed to ozone, decomposition rate of ozone has a momentarily sharp peak after that was stable. Subsequently, it was repeated thermal decomposition of ozone under the same condition we couldn't have the same results of high decomposition rate of ozone. Over 180℃ of heating temperature of stainless steel pipe, when ozone concentration flowing into the stainless steel pipe is high, decomposition rate of ozone is high. And also we found that temperature of stainless steel pipe was increasing. It was thought that cause of the temperature rise that occurs the heat generated in the ozone decomposition.

著者

古森 郁尊 西口 法明 匹田 政幸 水谷 照吉

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.8, pp.586-593, 1993-08-20 (Released:2008-07-15)

参考文献数

12

被引用文献数

1 5

---

We have constructed a prototype of partial discharge (PD) pulse measurement and degradation diagnosis expert system (PDM/ES-I) using a personal computer for insulation degradation diagnosis of materials suffering from PDs. For 0.1 mm-thick low density polyethylene (LDPE) with CIGRE Method II electrode system, temporal change of phase-angle-resolved PD pulse occurrence distribution was measured with PDM/ES- I. We applied the so-called "pattern recognition" of the PD pulse distribution to diagnosis of insulation degradation and assessment of residual life. Experimental results revealed that in spite of large scattering of time to breakdown, i. e. life, from 5 to 43 hours, all the tested samples exhibited similar evolution of the profile of PD pulse occurrence distribution with increasing aging time. The PD pattern measured at a given aging time was compared with five standard normalized PD patterns which had been registered in advance as five representative degradation stages from initial degradation category to final one. The degradation stage determined by the pattern recognition (PR) method proved to vary from the initial degradation category to final one in a correct turn. Consequently, the PR method permitted an exact determination of the degree of degradation at a given aging time. In other words, the PR method was capable of predicting the residual life of LDPE with a CM-II electrode system.

著者

森 幹男 内山 皓貴

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.11, pp.582-583, 2018-11-01 (Released:2018-11-01)

参考文献数

5

被引用文献数

3

---

The embouchure is one of the most important components to playing human whistle. The purpose of this study is to clarify the influence of the embouchure in the whistle on the volume in order to ascertain the validity of the description of the whistle instruction book. When the cross-sectional area and the thickness of the opening of the lip plate of the human whistling are varied each, the air inflow amount per unit time and the pitch and volume of the generated sound were measured. Based on the relationship between the amount of air inflow per unit time and the volume of sound generated, part of whistle teaching method and the whistle instruction book described based on experience was supported by physical experiments.

著者

宮内 肇 川中 淳子 栗栖 佳子

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.7, pp.403-408, 2015

被引用文献数

1

---

"Iwami-kagura" is the traditional dance arts in the western Iwami district of Shimane. It is dance performance about many topics "The Izumo myth". It is special dance with story characteristics and a dynamic movement. The crisis of the tradition by the local depopulation has become a serious problem these days. And young children tend to keep away from a physical science. Therefore we suggest "Iwami-kagura robot performance contest" in this study. This contest is that performance groups of handmade robots compete on the basis of the theme of the Iwami-kagura. In this way we can let young children show an interest in local traditional arts and technology through manufacturing.

著者

西前 順一 吉沢 憲治

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.112, no.1, pp.1-8, 1992-01-20 (Released:2008-07-15)

参考文献数

16

著者

福間 眞澄 内田 孝幸 福島 志斗 小川 仁一 吉野 勝美

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.134, no.5, pp.299-306, 2014 (Released:2014-05-01)

参考文献数

16

被引用文献数

3 3

---

The electric double layer capacitor (EDLC) electrode is made of carbonized and activated materials. The material surface and electrical characteristics of carbon materials produced from low cost organic materials were examined. First, a cotton cloth was carbonized and activated, and its optimal time and temperature of carbonization and activation processing were examined. And, its surface area, pore volume and pore size distributions were analyzed. Second, activated carbons were applied to the electrodes of 1Wh class EDLC cell with water electrolyte solution. The capacitances and internal resistances of the assembled EDLC cell were measured by a charge and discharge circuit using constant voltage source. And, the charge and discharge cycle test was performed on these assembled EDLC cells under practical use condition. As a result, EDLC cells using the activated carbon with large surface area of 1300m2/g showed the high density of capacitance 0.5-1.1F/cm2. The internal resistances of EDLC cells were less than 0.34W. It was also found that the EDLC cells had no deterioration in the charge and discharge cycle test under practical condition. It shows that the activated carbon made of cotton cloth contributes to the low cost and safety electrode of an EDLC.

著者

梅田 耕太郎 小野 靖

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.11, pp.1143-1144, 2003 (Released:2004-02-01)

参考文献数

4

---

The Ballooning mode, which occurs at a region where the plasma pressure gradient exceeds a certain limit, needs to be suppressed to achieve high β. Using a magnetic-probe system with a high spatial resolution, we measured magnetic fluctuations in a very local area to get fluctuations due to the Ballooning mode. As its result, we found that the amount of fluctuation decreased with Itfc while Itfc < 40 kA, but that it increased while Itfc > 40 kA, which agreed with the earlier simulation of the ballooning mode. Analyzing the fluctuation of Itfc > 40 kA, we found that the frequency was 0.4 - 0.8 MHz and the mode number was about 10.

著者

雪田 和人 後藤 時政 水野 勝教 中野 寛之 一柳 勝宏 後藤 泰之 森 豪

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 = 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.130, no.1, pp.95-102, 2010-01-01

被引用文献数

3 2 2

---

Recently the importance of Monozukuri (manufacturing) has been watched with keen interest as a social; problem, which has a relation with schoolchildren's decline of their academic standards, pointed out by the reports of PISA of OECD and TIMSS, etc., and their "losing interest in science" and "dislike of science", some people worry about, which will lead to the decline of technology in the home industry, the top-class personnel shortage, and the decrease of economical power in this country in the future. In order to solve such a problem, science pavilions, universities, and academic societies of science and engineering etc. in various places hold "Monozukuiri Classrooms" or "Science Classrooms". We can say that various activities which try to hold off "losing interest in science" and "dislike of science." in the whole society. Under such a situation, Aichi Institute of Technology (AIT) to which we belong, also tries to contribute to the activity of solving the problem, and holds various engineering education lectures which intend for elementary, junior high school and senior high school students. AIT has held "The Whole Experience World" which tries to bring up a talented person who has a dream and hope towards science and technology, grows his/her originality, intellectual curiosity and spirit of inquiry, and supports the nation based on science and technology in the summer vacation since 2001.<br>This paper reports the result of a questionnaire about what kind of the long-term learning effect on the children who participated in "The Whole Experience World" and "Boys and Girls Robot Lectures". As the conclusion of the study, we can say that the lectures could give the participants who were interested in science and technology more interest. And we could give them the idea of what the study of science and technology is. As a result, we could contribute to the participants' decision of the courses' selection in life.