All issues
Volume 126, Issue 10
Displaying 1-10 of 10 articles from this issue
- |<
- <
- 1
- >
- >|
Review
-
Ken-ichiro Ota, Akimitsu Ishihara2006 Volume 126 Issue 10 Pages 951-954
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSPolymer electrolyte fuel cells (PEFCs) are expected to be alternative power sources for transportable and residential applications due to their high theoretical efficiency of energy conversion. However, the efficiency on a present technology used platinum as cathode catalyst is not so high because of a large overpotential of the oxygen reduction reaction (ORR). A large overpotential of ORR is needed to be reduced to contribute to the development of a sustainable and clean energy system. Other issues of the Pt usage are the high cost and the limited amount of the resources. Considering the application of PEFCs to fuel cell vehicles, the development of more active cathode catalysts or to further reduce the amount of platinum without losing cell performance is required. In this paper, we summarized the problems of PEFCs and the situation of research and development of more active cathode catalysts. In addition, the trial of non-platinum materials on new cathode catalyst was mentioned.View full abstractDownload PDF (494K)
Paper
-
Masaaki Kurozumi, Michio Iemura2006 Volume 126 Issue 10 Pages 955-962
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSConcerning the plural operating circuits for metal halide lamps, the authors propose plural operating circuits of plural lamps on a common bypass circuit in which current runs nearly sinusoidal. We connect a common bypass circuit to the secondary winding of ballast for the leakage transformer type operating circuit.
We also propose a method for making it possible to light all the lamps at the same time by connecting resistances between the secondary winding and the common bypass circuit. Moreover, by inserting condenser capacity Cs of power factor improvement, it is possible to improve power factor.
It is shown from computer simulation and experiment that it is possible to improve power factor and reduce harmonic current by adjusting these three factors above to the reasonable value.View full abstractDownload PDF (3914K) -
Kenji Ebihara, Masahiro Takayama, Henryka Danuta Strycewska, Tomoaki I ...2006 Volume 126 Issue 10 Pages 963-969
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSWe have developed ozone (O3) generation system suitable to soil sterilization. Wide range concentration control of O3 is required for the sterilization treatment depending on the soil property and plant growth. The dielectric barrier discharges using electrode such as Pyramid type is studied. Surface discharges are also applied to generate high concentration for quick sterilization of the agricultural soil. The treated soil properties under ozone sterilization were evaluated using pH and electrical conductivity. It is shown that ozone distribution in the soil is controlled mostly by the conditions such as concentration and flow rate as well as soil conditions of moisture and compositions.View full abstractDownload PDF (1295K) -
Masashi Ohchi, Noriyuki Aoki, Tatsuya Furukawa, Toshihiro Kawahara2006 Volume 126 Issue 10 Pages 970-976
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSThe student laboratory is an essential subject in the engineering departments of universities. However it is hard for both teachers and students to implement that. In our Department of Electrical and Electronic Engineering in Saga University, the support environment is said to be insufficient to conduct the student laboratory. In order to overcome the problem, it is effective to implement the support system for the student laboratory using database and Web server. In the paper, we will describe the design and the implementation of student laboratory support system based on the Web technology using the Database.View full abstractDownload PDF (1273K) -
Tetsuo Fukuchi, Hideki Ninomiya2006 Volume 126 Issue 10 Pages 977-982
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSUltraviolet absorption spectroscopy was used to measure the absorption cross section of SO3. The measured cross section had a peak value of about 9×10-19 cm2 near wavelength 200 nm. In addition, a method to measure the concentration of SO3 by thermal conversion of SO3 to SO2 at elevated temperatures was developed. Laboratory experiments showed that SO3 can be converted to SO2 at temperatures of about 870K. These methods are potentially applicable to flue gas monitoring in fossil-burning power plants.View full abstractDownload PDF (440K) -
Naoyuki Shimomura, Akemi Teramoto, Hidenori Akiyama2006 Volume 126 Issue 10 Pages 983-989
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSTo replace paper-based textbooks with web-based textbooks has caused several available features. The textbooks which are provided on the internet can always keep the latest information, and it is facile to include not only texts but also contents using multimedia and special functions. The web-based textbook on pulsed power, which is one of technical and science fields, has been prepared. In the textbook, the parts of pulsed power bases are described in classic text style and the chapter of pulsed power applications is provided by lectures with slides and vocal audios. Specialized calculators on pulsed power and virtual pulsed power laboratory consisting of several simulators are served through the web interface. A function of “Who's Who" is a database of the authors, researchers of pulsed power and users of this textbook in order to provide their communication by e-mails. A formation of the community for pulsed power researchers as well as learners is anticipated by using the database. This textbook will be beneficial to the education in graduate schools and to the COE program as a self-learning material.View full abstractDownload PDF (1547K) -
Daisuke Kobayashi2006 Volume 126 Issue 10 Pages 990-996
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSThis article presents the pulse propagation characteristics through the via structures (via, pad, and clearance hole) by using the FDTD method. We investigated the size of the via structures so as to maximize the peak value of pulse responses for the Gaussian pulse incident with the pulse width from 0.2ps to 20.0ps. We showed that the pulse width is limited by the radius of via and the radius of pad. Numerical accuracy is investigated from the points of the sell size, the terminal conditions of microstrip line, and the distance between the exciting point and PML. The peak value of responses becomes smaller as the pulse width is reduced and the via radius is enlarged.View full abstractDownload PDF (752K) -
Takashi Ohinata, Shigeaki Akatsuka, Mineo Kawakami, Kenji Arimatsu, Ka ...2006 Volume 126 Issue 10 Pages 997-1003
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSThis paper describes a new type variable inductor and its applications to power controller for use in electric power system. First, we developed an EIE-core type variable inductor. The EIE-core type variable inductor has good control characteristics without gaps. It is suitable for large capacity variable inductor because the core is made of laminated iron core, and has not any gaps for harmonic current reduction. Next, we present a trial 6.6kV-300kVA Magnetic Flux Control Type Reactor (MFCR) for reactive power compensator based on the EIE-core type variable inductor. The MFCR has good control characteristics, simple structure and high reliability, low level current distortion, high-speed response, and low cost. Last, we demonstrate a Field-Test of the 6.6kV-300kVA MFCR, which is connected to the 6.6kV ac distribution system.View full abstractDownload PDF (1030K) -
Tetsushi Okamoto, Makoto Kawahara, Toshimitsu Yamada, Yoshiyuki Inoue, ...2006 Volume 126 Issue 10 Pages 1004-1012
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSDuring the last three decades, extensive and worldwide research has resulted in progress being made with respect to many aspects of percolation phenomena of composites with one kind of filler. However, composites made with two kinds of filler have not yet been investigated in depth. The percolation phenomena of the potential grading materials made up of silicon carbide, tri-iron oxide and high density polyethylene have been discussed in this study. As a result, a potential grading layer, which has a stable and excellent partial discharge suppression capability, has been developed.View full abstractDownload PDF (991K)
Letter
-
Tomo Tadokoro, Yasuhiro Tanaka, Tastuo Takada, Takashi Maeno2006 Volume 126 Issue 10 Pages 1013-1014
Published: 2006
Released on J-STAGE: January 01, 2007
JOURNAL FREE ACCESSThe pulsed electro-acoustic (PEA) method has been widely used to observe a space charge distribution in various solid dielectric materials. In this report we applied the method to an investigation of the space charge behavior under a high electric filed with a visible light irradiation. It is well known that a property of the conduction in dielectric materials is affected by the irradiation of light. To observe the effect of the light irradiation on the space charge distribution in polyimide, we measured the time dependent space charge distribution under the irradiation of the visible light using three kind of LED.View full abstractDownload PDF (291K)
- |<
- <
- 1
- >
- >|