All issues
Predecessor
- IEEJ Transactions on Industry Applications
- IEEJ Transactions on Electronics, Information and Systems
- IEEJ Transactions on Power and Energy
- IEEJ Transactions on Fundamentals and Materials
- The Journal of The Institute of Electrical Engineers of Japan
- The transactions of the Institute of Electrical Engineers of Japan.C
- The transactions of the Institute of Electrical Engineers of Japan.B
- The transactions of the Institute of Electrical Engineers of Japan.A
- The Journal of the Institute of Electrical Engineers of Japan
Volume 125, Issue 2
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
Special Issue on Trends of Sensing Technologies for Bad Smell and Environmental Pollution
Special Issue Review
-
Yoshiharu Iwasaki2005 Volume 125 Issue 2 Pages 45-49
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSIt has been said that the measurement of odor is very difficult. Because almost odor samples have a large number of chemicals, and these olfactory thresholds are very low levels. For these reasons, the instrumental measurement method is not good, and the olfactory sensory methods are adopted in the world.
Odor concentration scale had been widely used in the world. But, the measurement methods of odor concentration scale differ depend on the country.
For example, in Japan, Triangle Odor Bag Method has been used from 30 years ago. Dynamic olfactometer is used in European countries. Triangle Odor Bag Method is introduced at the end of this paper.View full abstractDownload PDF (4097K)
Special Issue Paper
-
Kazutoshi Noda, Kunitoshi Matsunobu, Hidenobu Aizawa, Shigeru Kurosawa ...2005 Volume 125 Issue 2 Pages 50-56
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSA highly sensitive detecting method for trichloroethylene using quartz crystal microbalance was newly developed. The method uses oxidizing agents such as PbO2 and H2SO4. TCE is converted into HCl by the reaction with the oxidizing agents and then reacts directly with a copper electrode placed on the quartz crystal surface to forms copper chloride. In case of 100 ppb of trichloroethylene concentration and fundamental frequencies of 9 MHz at 30°C, the frequency response of about -14 Hz was obtained. The new method enables the measurement of very low concentrations of TCE.View full abstractDownload PDF (7720K) -
Gao Wei, Shabbir A. Khan, Liqin shi, Yuki Hasegawa, Teruaki Katsube2005 Volume 125 Issue 2 Pages 57-63
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSIn order to develop a high temperature (200°C˜400°C) and high sensitive NOx gas sensor with SiC based junction structure, a hetero-junction structure, Pt/SnO2/SiC/Ni, was investigated and compared with the catalytic metal gate Schottky structure (Pt/SiC/Ni) sensor. It was found that the hetero-junction device showed much higher sensitivity to NO2 gas compared with the Schottky junction structure sensor, whereas Schottky structure device had better sensitivity to NO gas than a hetero-junction structure sensor. These results suggest that selective detection of NO and NO2 gases may be attained with these different structure devices.View full abstractDownload PDF (5372K) -
Yukinobu Tanaka, Masahiro Yoshioka, Takamichi Nakamoto, Toyosaka Morii ...2005 Volume 125 Issue 2 Pages 64-69
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSRecently, bad smell is deteriorating environment. Although GC/MS (Gas Chromatograph/Mass Spectrum) method is often used to analyze gases, a more rapid and lower-cost method is desired. Since a gas detector tube technique is well known as a simple method for gas measurement, we focused on it to perform bad-smell sensing for monitoring the living environment. A gas concentration is visually obtained by reading the length of the color-changed layer. We developed a simple system for automatically measuring the color change in the gas detector tube using an optical scanner. In the present study, the interference between the target and other substance was studied. The result suggests that the quantitative analysis without the interference is feasible, utilizing the difference of the reaction time between the two analytes. Moreover, the sensitivity of the gas detector tube was studied. We confirmed the cumulative effect of gas detector tube and it was possible to measure methyl merchantman with its concentration less than 32 ppb.View full abstractDownload PDF (5039K) -
Yasuhiro Shimizu, Kenichi Tsumura, Takeo Hyodo, Makoto Egashira2005 Volume 125 Issue 2 Pages 70-74
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSEffect of metal loading on the H2 sensing properties of semiconductor gas sensors prepared by the SnO2 powders modified with a mesoporous SnO2 layer has been investigated. Metal loading on the SnO2 powder prior to the modification with the mesoporous SnO2 layer resulted in larger H2 response than the sensor prepared by loading after the modification. This phenomenon was highlighted in the case of Ru loading, in comparison with Pd, probably due to its moderate catalytic activity. The markedly improved H2 response was considered to arise from a synergistic effect of the diffusion control by the mesoporous SnO2 layer and the chemical sensitization by the Ru loaded on the SnO2 powder surface. The smaller response induced by the Ru loading after the modification with the mesoporous SnO2 layer was attributed to consumption of H2 at the surface of the mesoporous SnO2 layer.View full abstractDownload PDF (6432K) -
Kenshi Hayashi, Hiroki Tanaka, Kosuke Hayama, Ryosuke Izumi, Kiyoshi T ...2005 Volume 125 Issue 2 Pages 75-80
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSAldehyde and carboxylic acid compounds are known as volatile substances with bad smell. It is also said to cause bad smell of tap water. In this study, we tried to detect and analyse aldehyde and carboxylic acid dissolved in water, using a surface-polarity controlled sensor. The sensor measures electrochemical impedance of the electrode surface whose electric potential is dynamically controlled. Adsorption and desorption of target chemicals cause changes in impedance which has constant phase element (CPE) characteristics. The impedance changes depending on the electrode potential are used as a chemical sensor output. As a result, we could detect and distinguish many kinds of aldehyde and carboxylic acids. Furthermore various water pollutant can be detected with high sensitivity. The results suggest that a simple and multi-purposed sensor can be constructed for environmental analysis using the proposed method.View full abstractDownload PDF (373K)
Paper
-
Takaaki Isoda, Satoshi Hasegawa, Kazuhiro Noguchi, Kana Takamatsu, Fuy ...2005 Volume 125 Issue 2 Pages 81-88
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSRecently, a fluid micro electro mechanical system (fluid MEMS), which is composed of a micro pump, mixer, valve, reactor, sensor, an electric circuit, on a chip, is being applied to a biotechnology or a medical analysis. Authors developed a micro sensor mounted on a chip to measure a concentration of one drop of solution (1nL-10μL) which contained nuclear acids. The form of the micro sensor mounted on the chip was a pair of Cu electrode which was a diameter of 2mm and was a thickness of 10μm. The sensing function was evaluated by the changes in a concentration of poly(x) (x=adenine, guanine, uracil, and cytosine) solution which was dropped on a micro sensor.
To increase a recognization against nucleic acid, various adsorbent was added in a droplet. Especially, high recognition against the nucleic acid was observed with the adsorbent which modified the surface of polystyrene micro beads(10μm) using schizophyllan: a kind of polysaccharide. This biosensor recognized a small quantity of total-RNA and m-RNA extracted from the yeast.View full abstractDownload PDF (8006K) -
Yuki Tomita, Ayako Iwasawa, Kohro Takahashi2005 Volume 125 Issue 2 Pages 89-94
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSThe digital micromirror device (DMD) is a new display device fabricated by the micromachining technique and used in projectors. In this paper, the DMD serves as rapid prototyping. In the system, the DMD and a mercury lamp are used as a pattern generator and an UV source, respectively. Since the developed exposure system doesn't need LASER, a simple and low cost system can be realized. By using the DMD with a quartz glass window, all kinds of resins from UV to visible light can be available. Excess growth was suppressed by reduction of unnecessary light length contained in a mercury lamp. It is possible to reduce the design time for non-scanning rapid prototyping by introducing 3DCAD.View full abstractDownload PDF (4921K) -
Hiroshi Asanuma, Hideaki Aso, Hiroaki Niitsuma2005 Volume 125 Issue 2 Pages 95-100
Published: 2005
Released on J-STAGE: May 01, 2005
JOURNAL FREE ACCESSThe effect of the squeeze film to the characteristics of the capacitive micro accelerometers, which the authors have previously fabricated for detection of acoustic signals, has been examined using a model of equivalent circuit. The change in resonant frequency and sensitivity associated with a change of the inside pressure of the sensor have been reasonably simulated by the model. The authors have examined the optimum design of the micro accelerometer using the model, and have found that flat sensitivity up to 1 kHz, which is required to the sensor, can be achieved by changing gap length and size of the moving mass.View full abstractDownload PDF (5175K)
- |<
- <
- 1
- >
- >|