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Omura, Yukiko,Kyung, Kyu-Hong,Shiratori, Seimei,Kim, Sae-Hoon American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.29
<P>The relationship between solution pH and effects of applied voltage in layer-by-layer (LbL) self-assembly was investigated, using weakly charged polyelectrolytes and nanoparticles. Poly(allylamine hydrochloride) (PAH)/poly(acrylic acid) (PAA) films and PAH/SiO<SUB>2</SUB> nanoparticle films were fabricated at several solution pH conditions, by LbL self-assembly under an applied voltage. Adsorption behavior and surface morphology of films fabricated under applied voltages depended on the solution pH. A textured structure was formed by applied voltage at a specific pH for PAH/PAA films. The effect of applied voltage on film deposition was related to the electrical charge density and polymer chain conformation. The effects of applied voltage were higher, when the polymer electrical charge density was higher, that is, when the polymer chain exhibited a stretched structure. It was found that the amount of adsorption increased at all pH conditions under the applied voltage.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2014/iecred.2014.53.issue-29/ie403736r/production/images/medium/ie-2013-03736r_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie403736r'>ACS Electronic Supporting Info</A></P>
A New Basic Element for Neural Logic Functions and Capability in Circuit Applications
Omura, Yasuhisa The Institute of Electronics and Information Engin 2002 Journal of semiconductor technology and science Vol.2 No.1
This paper describes a new basic element which shows a synaptic operation for neural logic applications and shows function feasibility. A key device for the logic operation is the insulated-gate pn-junction device on SOI substrates. The basic element allows an interface quite compatible to that of conventional CMOS circuits and vMOS circuits.
Impact of Fin Aspect Ratio on Short-Channel Control and Drivability of Multiple-Gate SOI MOSFET's
Omura, Yasuhisa,Konishi, Hideki,Yoshimoto, Kazuhisa The Institute of Electronics and Information Engin 2008 Journal of semiconductor technology and science Vol.8 No.4
This paper puts forward an advanced consideration on the design of scaled multiple-gate FET (MuGFET); the aspect ratio ($R_{h/w}$) of the fin height (h) to fin width (w) of MuGFET is considered with the aid of 3-D device simulations. Since any change in the aspect ratio must consider the trade-off between drivability and short-channel effects, it is shown that optimization of the aspect ratio is essential in designing MuGFET's. It is clearly seen that the triple-gate (TG) FET is superior to the conventional FinFET from the viewpoints of drivability and short-channel effects as was to be expected. It can be concluded that the guideline of w < L/3, where L is the channel length, is essential to suppress the short-channel effects of TG-FET.
Omura, Yasuhisa,Iida, Yukio,Urakawa, Fumio,Ogawa, Yoshifumi The Institute of Electronics and Information Engin 2007 Journal of semiconductor technology and science Vol.7 No.2
We propose and experimentally demonstrate a ring resonator with sharp U-turns fabricated on a silicon-on-insulator (SOI) substrate; the resonator was designed as a key part of an optical, dynamic data storage device. We discuss the optical properties of the fabricated ring resonator from the viewpoint of equi-frequency-contour behavior in a dispersion space. We successfully characterize its optical characteristics on the basis of photonic crystal physics. It is suggested that the photonic ring resonator will be applicable to optical, dynamic memory devices for optical communication systems.
BEHAVIOR OF THE BENTHIC FAUNA IN THE RIVER RECEIVING AN EFFLUENT FROM A SEWAGE TREATMENT PLANT
Omura, Tatsuo,Umita, Teruyuki,Fukushi, Kensuke 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
ABSTRACT The investigation of benthic fauna in the river receiving the effluent of sewage treatment plant was conducted in order to evaluate the impact of the effluent against the river ecosystem. The benthic fauna was significantly influenced by the effluent of sewage treatment plant. The effluent of sewage treatment plant brought the decrease in species of benthic animals so that the diversity of benthic fauna in the natural river. On the other hand, the biomass of benthic animals increased near the outfall of sewage effluent, and chironomidae (R-type) was predominant. The result obtained from investigation showed that the benthic fauna could be used as an effective index in evaluating the impact of sewage effluent from the ecological viewpoint. The investigation of benthic fauna in the river receiving the effluent of sewage treatment plant was conducted in order to evaluate the impact of the effluent against the river ecosystem. The benthic fauna was significantly influenced by the effluent of sewage treatment plant. The effluent of sewage treatment plant brought the decrease in species of benthic animals so that the diversity of benthic fauna in the receiving river would remarkably drop in comparison with that of the natural river. On the other hand, the biomass of benthic animals increased near the outfall of sewage effluent, and chironomidae (R-type) was predominant. The result obtained from investigation showed that the benthic fauna could be used as an effective index in evaluating the impact of sewage effluent from the ecological viewpoint.