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R&D Reports

vol. 2011 - II (2011.11.30 issue)

Development of Innovative Diesel Particulate Filters based on Aluminum Titanate: Design and Validation

Diesel particulate filters have contributed to decreasing particulate matter (PM) in the exhaust gas of diesel cars, and they have become standard diesel exhaust gas after-treatment devices. Silicon carbide (SiC) is currently used as a material in these filters due to its high thermal stability. Aluminum titanate (AT) is recognized as a candidate for the next generation of filters due to advantages not only in manufacturing cost but also in superior performance.
We have developed an innovative AT filter, and in this paper we introduce its design concepts and validation results.
( 4-13 by Akiyoshi NEMOTO, Kentaro IWASAKI, Osamu YAMANISHI, Kazuya TSUCHIMOTO, Kousuke UOE, Tetsuro TOMA, Hajime YOSHINO)

Development of a Novel Paddy Rice Herbicide Propyrisulfuron (ZETA-ONE®)

Propyrisulfuron is a novel sulfonylurea herbicide with a fused heterocyclic moiety, developed by Sumitomo Chemical Co., Ltd. Propyrisulfuron is used as a rice herbicide to control annual and perennial paddy weeds, including Echinochloa spp., sedges and broadleaf weeds. Propyrisulfuron controls weed biotypes that have developed resistance to the commercialized sulfonylurea herbicides. Propyrisulfuron shows safer profiles for human health and the environment. The granular formulation, suspension concentrate formulation and jumbo formulation (granules packed in water-soluble film) are available in Japan with the brand name of ZETA-ONE®.
( 14-25 by Hajime IKEDA, Shigeyuki ITO, Yukio OKADA, Kazuki MIKATA, Mariko ENDO, Ichiro KOMOTO)

Application of Plastics CAE: Focusing on Impact Analysis

To review recent topics on impact analysis in the field of plastics, this report outlines the application trends and analysis techniques followed by an explanation of the characteristic physical properties of resins which may be the key points for their practical application. First we introduce how we predict yield stress under a wide range of temperatures and strain rates. Second, for the elastic-plastic model, we explain that it may be appropriate to consider dependence of yield stress on stress state and volume increase due to craze generation. Finally, we show how fracture behavior depends on temperature and strain rate.
( 26-36 by Masaaki TSUTSUBUCHI, Tomoo HIROTA, Yasuhito NIWA, Tai SHIMASAKI)

Present Status and Future Prospect on ULSIs and Related Semiconductor Materials

The performance of ULSIs (Ultra Large Scale Integrated Circuits) has been dramatically enhanced over 30 years by increasing the number of transistors per unit area and the operation speed per single gate simultaneously by the miniaturization technology through the guiding principle of the scaling rule applied to Si CMOSFETs (Complementary Metal-Oxide-Semiconductor Field Effect Transistors). However, miniaturization of the transistors becomes increasingly difficult due to physical limitations, and the conventional scaling rule will not be enough to enhance the performance of the ULSIs. Thus introducing new device structure, new processes, and new materials become increasingly important. The present status of and future prospects for new semiconductor materials for next generation ULSIs are reviewed in this paper.
( 37-53 by Masahiko HATA, Shinichi TAKAGI, Mitsuru TAKENAKA, Tetsuji YASUDA)

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