著者

籏福 寛

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.121, no.8, pp.739-744, 2001-08-01 (Released:2008-07-15)

参考文献数

5

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The magnetic field strength in the nickel rod with an applied uniform external field is studied by transmitting ultrasonic waves. In the non-destructive testing (NDT) longitudinal plane waves are transmitted from a ultrasonic transducer to the object, which is characterized by alternating regions of compression and dilation. If the objects are ferromagnetic materials, the compression waves generate the magnetoelastic energy in magnetic substances, which are equivalent to the magnetic anisotropy field. This field passes through magnetic substances with the velocity of ultrasound and is observed as the electromotive force, emf, induced in the sensing coil. As the ultrasonic waves are transmitted continuously to a rod specimen the ultrasonic stationary wave is formed in it and the high frequency magnetic field is generated in nodes of the stationary state by the inverse effect of magnetostriction and then the emf is induced in the nodes. In this paper the strength of effective magnetic field in the nickel rod is estimated by measuring the electromotive force induced in the sensing coil.

著者

太田 昭男 坂口 広憲 坂本 徹 浅野 恭一

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.123, no.7, pp.611-617, 2003 (Released:2003-10-01)

参考文献数

10

被引用文献数

1

---

Using a scanning Hall-sensor microscope with an active area 25µm×25µm, we measured the magnetic field distributions due to spontaneous magnetization on flat surfaces of low carbon steel SM400B with a yield point of 326N/mm2 and a pulling strength of 469N/mm2 under a static condition of terrestrial magnetism. Referring to the stress-strain curve, we applied a uniaxial stress to the sample and increased the stress level following the pre-scheduled experimental run, while measuring the magnetic profiles both for the stress state and after its release. The magnetic profile in the elastic stress nearly agrees with that after the release, and also agrees with that for the virgin state. However, as the stress level increases beyond the yield point and gives the residual strain after the stress release, there appear marked changes only in the results after the release compared to the others, which are attributed to the occurrence of Lüders bands. The positions with such changes in the magnetic profile move along a length direction of the sample, with extension of the Lüders bands to the whole part. The study shows the possibility to obtain information on a degree of strain progress in steels using magnetic images and to open up a practical way for non-destructive testing.

著者

若林 整

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.121, no.6, pp.590-590, 2001-06-01 (Released:2008-07-15)

著者

Mitsuteru Sato Yukihiro Takahashi Makoto Suzuki Atsushi Yamazaki Tomoo Ushio

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.131, no.12, pp.1000-1005, 2011-12-01 (Released:2011-12-01)

参考文献数

15

被引用文献数

6 10

---

Six-channel spectrophotometers (PH) are the science instruments of JEM-GLIMS to measure absolute intensity of the emission originated from lightning discharges and upper atmospheric transient luminous events (TLEs). PH unit-1 (PH-U1) consists of four spectrophotometer channels named from PH1 to PH4, while PH unit-2 (PH-U2) two spectrophotometer channels named PH5 and PH6. Optical filters of these spectrophotometers are selected to detect TLE emission lines of N2 1PG, N2 2PG, N2+ 1NG, and N2 LBH. Since the bandwidth of the optical filter of PH2, 3, 5, and 6 is 10 nm and since PH1 measures NUV emission, photomultiplier tubes with high-voltage converters are used as a photon detector. To the contrary, PH4 uses a photodiode as a photon detector because the pass-band of the optical filter is enough wide to detect transient optical emission. Though PH does not equip spatial resolution, it can acquire light curve data with a high time resolution of 50 μs with a 12-bit resolution. Thus, the combinational analysis of PH data and Lightning and Sprite Imager (LSI) data, it is possible to clarify the relationship between TLEs and their parent lightning discharges, the occurrence condition of TLEs, and the energy of the electrons which excite TLE emission.

著者

堀 哲也 兼子 一重 水谷 照吉 石岡 貢

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.7, pp.663-668, 2003 (Released:2003-10-01)

参考文献数

14

被引用文献数

1 2

---

The effects of temperature and electrode materials on space charge distributions of Linear Low-Density Polyethylene (LLDPE) polymerized with Ziegler catalyst were measured with the pulsed electro-acoustic (PEA) method. The thickness of a sample was about 100 µm. Positive space charge was dominant and it changed from homo to hetero space charge with temperature. The mobility of positive charge was 8.1×10-15 m2V-1s-1 at 23°C and 1.0×10-14 m2V-1s-1 at 30°C. On the other hand, the mobility of negative charge was 3.7×10-15 m2V-1s-1 at 30°C. The positive space charge accumulating near the cathode enhanced the electron injection and, as a result, the charging current. The electrode materials used were aluminum and semi-conductive polymer. The space charge distribution and the charge injection depended on electrode conditions.

著者

江口 啓 安部 寛二 藤本 邦昭 紅林 秀治

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.135, no.11, pp.690-697, 2015-11-01 (Released:2015-11-01)

参考文献数

23

---

In this paper, a questionnaire survey for idealistic “literacy” and “contents” in technology education was conducted with 177 students, who belong to an institute of technology. Based on questionnaire contents carried out in the Japan Society of Technology Education (JSTE) from 2009, pre-service engineers' perceptions were analyzed by using statistical analysis. The questionnaire result for “literacy” in technology education suggested that it leads to bringing up an engineer to let a student recognize usefulness of the technical work and occupation. Furthermore, the questionnaire result for “contents” in technology education revealed that the student does not feel importance of the learning about “C Technology of Nurturing Living Things” than others.

著者

坂東 靜 野澤 昭雄 松谷 康之

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.12, pp.762-767, 2015-12-01 (Released:2015-12-01)

参考文献数

23

---

The objective of this study is to objectively evaluate the subjective complexity by change in oxygenated hemoglobin and hemodynamics for the developing the relief method of stress based on improving preference by subjective complexity. The change in oxygenated hemoglobin concentration (ΔoxyHb) and hemodynamic parameters as physiological indices and psychological intensity as psychological indices were measured when performing the four auditory stimuli repeatedly. As a result, comfort and subjective complexity indicated the inverted “U” shape function. The tendency of the correlation between ΔoxyHb and subjective complexity was categorized into three main types. Significant differences of stress coping were found by hemodynamics. It was clarified that physiological responses to subjective complexity were assessable objectively.

著者

斎藤 司 地主 真実 南谷 靖史

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.3, pp.155-156, 2009-03-01 (Released:2009-03-01)

参考文献数

2

被引用文献数

6 8

---

We investigated method to osmose water and seasoner to dried soybeans fast by pulsed electric field, in order to make soybeans a processed food fast. By applying the pulsed electric field to the dried soybeans in water, osmosis time of water to the soybean became approximately half. Then the emission of the discharge was observed on dried soybean. The color of coffee permeated more into the soybean treated than no-treated by the pulsed electric field.

著者

布施 則一 福地 哲生 水野 麻弥 福永 香

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.4, pp.241-246, 2015

被引用文献数

4

---

Non-destructive, two-dimensional distribution measurement of rusting under opaque anticorrosion paint was carried out, using a terahertz camera, a quantum cascade laser, and a galvanic scanner. The measurement speed of the present method was found to be 11 times faster than the conventional raster scanning method based on time-domain spectroscopy. A signal to noise ratio exceeding 10² was confirmed for both systems, which enables detection of minor rusting.

著者

蒲原 弘昭 工藤 善則 篠原 功 伊藤 彰

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.119, no.6, pp.814-820, 1999-06-01 (Released:2008-07-15)

参考文献数

10

被引用文献数

1

---

The deterioration diagnosis for XLPE cables using low-frequency voltage has been confirmed that it is able to detect not only bridged water trees but also un-bridged water trees. However, its degraded detecting performance has not been proven.In this paper, we examined the properties of a DC leakage current and a low-frequency loss current through the use of cables with different degrees of deterioration, and studied the performance of each measurement in detecting water-tree deterioration.As a result, it has been confirmed that for a water tree that has bridged an insulator, it is possible to detect deterioration in both the DC leakage-current measurement and the low-frequency loss-current measurement. On the other hand, for a water tree that has not bridged an insulator, although deterioration signals were not obtained in the DC leakage-current measurement, as is generally known, it has been ascertained that deterioration can be detected in the low-frequency loss current measurement.The above results has made it clear that the result obtained by the method of combining low-frequency method with DC leakage current method is high reliability.

著者

藤井 雅治 力石 博司 井堀 春生 有井 清益

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.121, no.6, pp.561-566, 2001-06-01 (Released:2008-07-15)

参考文献数

5

著者

及川 貴瑛 園田 潤 佐藤 源之 本間 規泰 池川 豊年

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.132, no.1, pp.44-50, 2012-01-01 (Released:2012-01-01)

参考文献数

13

被引用文献数

3 8

---

Analysis of lightning electromagnetic field using the FDTD method have been studied in recent year. However, large-scale three-dimensional analysis on real environment have not been considered, because the FDTD method has huge computational cost on large-scale analysis. So we have proposed a three-dimensional moving window FDTD (MW-FDTD) method with parallel computation. Our method use few computational cost than the conventional FDTD method and the original MW-FDTD method. In this paper, we have studied about computation performance of MW-FDTD parallel computation and large-scale three-dimensional analysis of lightning electromagnetic field on a real terrain model using our MW-FDTD with parallel computation.

著者

平田 晃正 丸田 章博 加藤 正史 江龍 修

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.132, no.12, pp.1124-1125, 2012-12-01 (Released:2012-12-01)

参考文献数

7

被引用文献数

1 1

---

The School of Engineering of Osaka University and the Department of electrical and electronic engineering, Nagoya Institute of Technology, coordinated and conducted survey for university students, students and teachers of high schools in order to realize effective activities of enlightenment for high school students. From the results of survey, it was suggested that the high-school teachers the most influential to high-school students. One of the promising contents in open lecture for high school students was the recent advanced technology allowing for the content of the science subjects in high school.

著者

加藤 正史 大原 繁男 江龍 修

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.132, no.12, pp.1122-1123, 2012-12-01 (Released:2012-12-01)

参考文献数

4

---

The Department of Electrical and Electronic Engineering, Nagoya Institute of Technology introduced the recording notebook in the graduation work to understand status of practice and fulfillment of students. Using the recording notebook, the students record practice time and evaluate monthly self-fulfillment. Teachers can guide students based on the record and the self-fulfillment. The system using the recording notebook will help quality assurance of education in the graduation work.

著者

加藤 正史

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.132, no.12, pp.1120-1121, 2012-12-01 (Released:2012-12-01)

参考文献数

4

---

To motivate students in classes by establishment of interactive communication between the students and a teacher, we provided construction-type slides to the students before lectures through a e-learning system and randomly assigned students questions to fill the construction-type slides in the lectures. From comparison between the same classes in two years which were performed with and without this educational method, score in examination was found to be slightly high in the class with this method. In addition, lecture evaluation questionnaires to the students revealed that this method surely motivated students and stimulated participation in the lecture.

著者

照井 康輔 山納 康 小林 信一 齊藤 芳男

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.123, no.5, pp.475-480, 2003 (Released:2003-08-01)

参考文献数

9

被引用文献数

3 4

---

Oxygen-free copper electrodes stored in the atmosphere were used as test samples. Changes of field emission characteristics with 500 repetitive breakdowns and He ion beam sputtering were investigated in conjunction with analyses of electrode surface conditions by X-ray Photoelectron Spectroscopy (XPS). Experiments revealed that field emission currents were detected from electrodes used as the anode after 500 breakdowns, while for electrodes that were heavily contaminated and the cathode after 500 breakdowns field emission currents were not detected. Although anode and cathode surfaces were cleaned by 500 breakdowns, the cathode surfaces were more completely cleaned than the anode surfaces during repetitive 500 breakdowns. Residual carbon may play a role to dominate field emission characteristics and breakdown characteristics.

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

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.2, pp.187-188, 2005 (Released:2005-05-01)

参考文献数

2

被引用文献数

1 1

---

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.