著者

Kogoma Masuhiro Takeda Atsushi Tanaka Kunihiko

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.127, no.7, pp.417-422, 2007-07-01

被引用文献数

2

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Fe oxide-coated TiO₂ particles for UV protection cosmetics were produced by means of atmospheric pressure glow discharge using IAA(Iron acethyl acetonato). The particles were also coated by a silica protection layer. To examine the UV catalytic ability of Fe oxide -coated TiO₂, we measured a squalene that contained the powders by GCMS for the gas products after the squalene had been irradiated by a Xe lamp for one hour. Using silica-coated TiO₂ that was coated by Fe oxide, we find almost no signals from any harmful organic oxides in the GC-MS spectra of the UV irradiated squalene. The multi- coated powder shows very fine and flesh like-color with pearl-like glowing.

著者

徳山 貢 太田垣 博一

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.126, no.7, pp.584-590, 2006-07-01

参考文献数

5

被引用文献数

1 1

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In this paper, a method is proposed to education of starting characteristics and stationary characteristics of three phase induction motors based on a direct numerical analysis. At first, a mathematical model is presented to three phase induction motors. Secondly, program codes in C language are shown to simulation studies with results obtained by the program codes. Finally, the results obtained in this paper are shown to the effectiveness of the proposed method to education of starting characteristics and stationary characteristics of various three phase induction motors.

著者

廣岡 伸治 服部 克巳 西橋 政秀 紺 晋平 竹田 辰興

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.131, no.9, pp.691-697, 2011-09-01

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The ionospheric anomaly prior to the 2007 SouthernSumatra earthquake (M8.5) was observed by GPS receivers around Sumatra islands. In this paper, to investigate the three-dimensional structure of electron density in Ionosphere, a tomographic approach (Residual Minimization Training Neural Network; RMTNN) has been performed. The results of the tomographic approach are consistent with those of total electron content (TEC) approaches. We found that the significant decreases take place in the heights of 250-400 km, especially at 330 km height. But the height which gives the maximum electron density is not changed. The obtained structure is that the decreased region exists in the southwest side of Integrated Electron Content (IEC) (400-550 km altitudes) and in the northern side of IEC (250-400 km altitudes). Global tendency of the decreases area is expanded to the east with an altitude and it is concentrated in the southern hemisphere of over the epicenter. These resultsshow that the high capability of RMTNN method for the estimation of the ionospheric electron density distribution possibly associated with earthquake.

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

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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

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 × 80-mm, and with 0.35 mm thick, their results of the magnetic flux density distribution and the inclination angle are mainly explained by α angle distribution of the polyctristal steel and seem to be in good agreement.

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

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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 “two wheels of one cart”. 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

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.

著者

湯浅 克也 鳥居 粛

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.125, no.12, pp.1047-1052, 2005-12-01

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This paper describes the novel scheme of the two-dimensional measurement of the surface magnetic flux density distribution of YBCO melt-processed bulk superconductor exposed in the alternatively changing field. It is well known that the surface flux density distribution is quite important to estimate the current density distribution inside the bulk and the position of the defect. Two-dimensional static field measurements are common and standard in these days, and one-dimensional dynamic ones are reported by many research groups. We tried to measure the two-dimensional dynamic distributions to obtain the further information on the superconducting bulk. The measurement system consists of ten Hall sensors located on straight line, which can be moved toward the perpendicular direction all together. The alternative magnetic field is applied by the external coil, and the sensors are moved in a way synchronized with the field. As the results, we obtain the two-dimensional dynamic surface flux density distribution of YBCO bulk. The specimen has several cracks on the surface, and we are able to find that some of them correspond to the irregular distribution of the results.

著者

須貝 太一 鈴木 智哉 南谷 靖史 能勢 泰祐

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.131, no.5, pp.401-407, 2011-05-01

被引用文献数

3 1

---

In this study, we investigated a water treatment method spraying the droplets of wastewater into pulse discharge space. The water treatment was carried out by applying voltage with different pulse widths to determine the optimum pulse width, and the optimum pulse voltage determined on the basis of the results of the study was analyzed. The rise time of the voltages with pulse widths of 40, 60, and 80 ns was about 12, 19, and 32 ns, respectively, and the discharge current in the case of the faster rise time was higher. The number of streamer discharges is believed to increase with a decrease in the rise time. The energy efficiency in the case of the pulse width of 40 ns is higher than that in the case of the other pulse widths. This is because almost all of active species are generated by early streamer discharge, and longer discharging time by longer pulse width makes more ineffectual energy by thermal loss. These results show that the pulsed voltage of faster rise time and shorter pulse width is optimum for the treatment.

著者

今井 隆浩 澤 史雄 尾崎 多文 中野 俊之 清水 敏夫 吉満 哲夫

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.124, no.11, pp.1065-1072, 2004-11-01

被引用文献数

12 16

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Recent rapid progress in nanotechnology has focused research and development efforts on new high performance materials. Organic-inorganic hybrid materials such as nylon-layered silicate nanocomposites have attracted special interest and various studies continue to be conducted on thermoplastic resins.<br>In this study, we found out the best organic modifier of layered silicate that contributed to an affinity for epoxy resin (thermosetting resin), and succeeded in creating an intercalated-type epoxy-layered silicate nanocomposite. This nanocomposite realized some improvements by the addition of 5 or 6 weight percentage of organically modified layered silicates, which have 20^oC higher thermal resistance, 60% higher fracture toughness, 19% higher flexural strength and 10% higher insulation breakdown strength than these of an epoxy resin without layered silicate fillers. An electrical treeing growth was observed in the nanocomposite. The electrical treeing progress with many branches in the nanocomposite seemed to result in an increase in the insulation breakdown strength. These results suggest the possibility of practical use as an insulating material in heavy apparatuses.

著者

高木 浩一

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 = 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.10, pp.963-971, 2010-10-01

被引用文献数

15 6

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Agricultural and food processing applications of pulsed power and plasma technologies are described in this paper. Repetitively operated compact pulsed power generators with a moderate peak power are developed for the agricultural and the food processing applications. These applications are mainly based on biological effects and can be categorized as germination control of plants such as <i>Basidiomycota</i> and <i>arabidopsis</i>; inactivation of bacteria in soil and liquid medium of hydroponics; extraction of juice from fruits and vegetables; decontamination of air and liquid, etc. Types of pulsed power that have biological effects are caused with gas discharges, water discharges, and electromagnetic fields. The discharges yield free radicals, UV radiation, intense electric field, and shock waves. Biologically based applications of pulsed power and plasma are performed by selecting the type that gives the target objects the adequate result from among these agents or byproducts. For instance, intense electric fields form pores on the cell membrane, which is called electroporation, or influence the nuclei. This paper mainly describes the application of the pulsed power for the germination control of <i>Basidiomycota</i> i.e. mushroom, inactivation of fungi in the soil and the liquid medium in hydroponics, and extraction of polyphenol from skins of grape.

著者

安田 倫己 山田 明宏 田中 武

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.12, pp.1112-1117, 2012-12-01

参考文献数

5

被引用文献数

1

---

LSI systems are used at all places in modern society. A number of different technologies are used to produce LSI systems, therefore it becomes difficult to understand these systems. The education which was consistent from an integrated circuit (IC) design to a printed circuit board mounting was mainly attained at universities and graduate schools. In this study, the training for understanding IC stacked structure and layout design was conducted on the education of a senior high school. Exclusive CAD software for LSI design, &alpha;-SX was used to IC layout design. Each Student had designed an inverter and a NAND circuit. They had designed a full adder circuit in a group. Then with public development equipment, IC chips were actually manufactured along with this layout design. Bare chips were observed with scanning electron microscope (SEM). SEM and Energy Dispersive x-ray Spectroscopy (EDX) analysis were effective to deeply understand between stacked structures and material characteristics of an IC. This project was taken as a cooperation education of a high school and a university. We showed the possibility to take in an integrated circuit structure education to one of the training subjects in a senior high school.

著者

椋橋 清 松田 好司 宮下 芳次 出村 剛 植田 朝喜与 吉野 勝美

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.124, no.4, pp.331-336, 2004-04-01

被引用文献数

2 2

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Having higher melting temperature than polyethylene, polypropylene has been expected as insulation material for power cable. But isotactic polypropylene used generally is unsuitable as cable insulation because it shows poor flexibility, low breakdown strength due to growing spherulites, and so on. But stereoregular syndiotactic polypropylene (s-PP) newly developed with metallocene catalyst shows quite different properties from i-PP.<br>  The authors had investigated the basic properties of s-PP and the initial properties as a cable which was manufactured using s-PP insulation, in the previous paper. As the results of this, it was revealed that s-PP had superior thermal and electrical properties to cross-linked polyethylene and the s-PP insulation cable showed satisfactory initial properties. However, in order to apply to an actual cable, the properties must be maintainable over 30 years after construction.<br>  In this paper, we estimated the long term and remaining properties for s-PP insulation cable.<br>  A series of experiments on long term properties gave following results.<br>    (1) S-PP cable shows longer life over 30 years.<br>    (2) The breakdown strength of s-PP cable after long term experiment equal to 30 years is slightly lower than initial breakdown strength, but it's sufficient as remaining property.<br>  Furthermore, water-tree resistivity of s-PP was investigated and it was revealed that s-PP significantly suppressed the water tree propagation compared with XLPE.<br>  These results suggested that s-PP cable would be available as next generation cable.

著者

島陰 豊成 呉 カイ 加藤 丈佳 岡本 達希 鈴置 保雄

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.124, no.3, pp.277-285, 2004-03-01

被引用文献数

8 8

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Degradation diagnosis is aimed at preventing unexpected failure and extending the service life of electric power apparatuses. It is, however, necessary to investigate the economic feasibility of degradation diagnosis, because the life-cycle cost of cable maintenance changes with the diagnostic parameters such as diagnosis cost, diagnosis interval and replacement criterion. In this paper, based on the actual data of water-tree degradation, we proposed a method of life-cycle-cost evaluation and evaluated the economic effect of degradation diagnosis. We also discussed the economic feasibility of practical nondestructive diagnosis of 6.6 kV XLPE cable, i. e. DC leakage current measurement and residual charge measurement, and compared the economic effects of these methods. As a result, the residual charge measurement is economically feasible and has higher effectiveness than the DC leakage current measurement.

著者

菅原 晃 田中 剛 板垣 厚一 阿部 隼人 座主坊 利人 SAMAULAH Hazairin 喜多村 博

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.123, no.5, pp.443-448, 2003-05-01

参考文献数

14

被引用文献数

1

---

The triggered vacuum gap (TVG) is a closing switch for generating large current pulse and can work in the wide range of voltage for several kV to tens kV. Main electrodes are made of Ag-WC. One of main electrode has a hole for trigger electrode (Mo). The switching time is short, if the polarity of the holed-electrode is negative. It is called polarity effect. We devised a crowbar circuit using the polarity effect of the TVGs. The crowbar current of this circuit was investigated experimentally by varying applied voltage, inductance, capacitance, gap length of TVGs, and trigger current duration. A crowbar current, crest of which is 2.4 kA and 4.9/270µs for example, was observed. The probability of generating the crowbar current was more than about 90 %, in the following condition: the trigger current duration of 6.65 µs and the gap length of 2-6 mm.

著者

小畑 修二 富田 英雄

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 = 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.123, no.10, pp.1002-1009, 2003-10-01

参考文献数

21

被引用文献数

4 9

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Metal foil eddy currents induced with flat (stacked spiral) induction coils are calculated numerically using an almost exact approach. Edge bake phenomena of metal foils are investigated to develop a new all-over heat adhesion method. As our aim, this approach is constructed with basic formulas for theoretically analyzing the induction heating phenomena. Fundamental equations in electromagnetic theory are used and a calculation method of self-inductance is developed using the Neumann's formula. These results can be applied to certification of various computer simulations by software on the market concerned with the eddy current.

著者

高松 衛 中嶋 芳雄 藤井 侃 佐伯 行紀 宮本 博幸 三上 寿枝

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.125, no.2, pp.187-188, 2005-02-01

被引用文献数

1

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Today, many goods are developed using the mental effect by the color. As a typical example, bath salts can be mentioned. In this study, the SD technique was used to quantitatively determine about how the color of solution influence the mental effect by 15 subjects. The results showed that effects by the red shades such as "warmth", and by the blue and purple shades such as "composedness", were high. Also, it clarified about the influence by the white muddiness.

著者

日野 浩二 阿部 晋 串田 正人

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.128, no.2, pp.81-85, 2008-02-01

被引用文献数

2 3

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Energy release from MIM structure of Al / nonpolar LB film / Au had continued for about three years,and temperature around MIM was reduced. In our present study, analyses were carried out on electrical properties of MIM of ultrathin polyimide LB film. Current, voltage and electrical power were analyzed in stationary state.

著者

真木 紘一 田中 照也

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 = 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.9, pp.595-604, 2009-09-01

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Subjects in radiation shielding for the low aspect ratio tokamak commercial reactor VECTOR are discussed and their solutions are presented. The subjects and design criteria of radiation shielding in ITER are consulted to discussion in the present work, because of these in commercial reactors same as those in the ITER.