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Catalytic synthesis of the ZnO-carbon nanofilament composite for sensor applications
Minoru Kuwata,Koji Iwasaki,Hidenori Gamo,Kiyoharu Nakagawa,Toshihiro Ando,Mikka Nishitani-Gamo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
We have studied to synthesize a ZnO-carbon nanofilament composite (ZnO-CNF) as it is expected to yield an interesting properties for sensor applications. The ZnO-CNF is considered to have a large surface area and a high electrical conductivity. The ZnO-supported Co catalysts were used for the synthesis of the ZnO-CNF. In order to fabricate a pattern of the composite for a biosensor, we have tried to prepare a paste from the composite for a screen-printing. We found that Co loaded catalysts exhibited a high catalytic activity for the carbon yields. SEM observation revealed that fibriform carbon deposits were obtained on the surface of the ZnO powder. In the case of using the Co-loaded ZnO catalyst, we found that the diameter of the fibriform carbon nanomaterial depended on the C2H4 concentration in the reaction gas. The reaction conditions are important to control the diameter of the fibriform carbon nanomaterial. The ZnO-CNF paste consisted of the ZnO-CNF, ethyl cellulose, and 2-(2-Butoxyethoxy) ethanol was prepared. The line patterns having 150μm were successfully fabricated with using the paste by screen-printing method.
A Review of Trends and Tasks of Korea’s Rural Life Improvement Programs: Lessons for Ethiopia
가모 베 렛켓 로바(Bereket Roba Gamo ),최윤지(Yoon-Ji Choi),최정신(Jung-Shin Choi),손주리(Joo-Lee Son) 한국농촌지도학회 2022 농촌지도와 개발 Vol.29 No.4
농촌 생활 개선은 대부분의 개발도상국 정부의 주요 정책 관심사로 남아 있다. 그러나 개발도상국들은 농촌개발정책을 시행하면서 농업생산성과 기술개발에 중점을 두었다. 본 논문은 한국의 농촌생활 개선 프로그램을 통해 구현되는 주요 과제를 파악하고, 제2차 세계대전 이후 에티오피아의 농촌개발 노력에 대해 설명하는 것을 목적으로 하였다. 이 자료는 한국에서의 집중적인 문헌 검토와 포커스 그룹 인터뷰를 통해 생성되었다. 일반적으로 두 나라와 특히 그들의 시골 지역은 가난했고 처음에는 거의 비슷했다. 1960년대 이후 한국 농촌의 상황이 급변한 반면 에티오피아 농촌은 아직 큰 개선을 경험하지 못했다. 에티오피아에서 다양한 농촌 개발 노력이 이루어졌지만, 시간이 지남에 따라 서로 다른 정치 정권이 시행한 변덕스러운 정책들이 농촌 부문의 저조한 실적을 뒷받침하는 주요 요인 중 하나로 나타난다. 또한 우리 정부의 농촌개발정책은 처음부터 농촌생활 개선권뿐만 아니라 농업생산기반 개선에도 동등한 비중을 두고 있었지만, 에티오피아 농촌개발정책은 오히려 농촌생활 개선의 측면을 소홀히 하였다. 농업가공, 농촌관광, 비농업 고용기회를 통한 농촌경제 다변화는 우리나라의 농촌개발정책에서도 또 다른 우선분야였지만 에티오피오티아의 농촌개발정책에서는 그렇지 않았다. 우리는 에티오피아가 농촌 생활 개선 노력에 적응할 수 있는 몇가지 교훈을 제안한다. Rural life improvement has remained a key policy concern for the governments of most developing countries. However, developing countries mostly focused on agricultural productivity and technology development while implementing rural development policies. This paper was aimed at constructing the trends and identify the major tasks implemented through the rural life improvement programs in Korea and describing rural development efforts in Ethiopia after the Second World War. The data was generated through an intensive review of literature and focus group interview in Korea. The two countries in general and their rural areas in particular, were poor and almost similar initially. While the condition of rural Korea rapidly transformed since 1960s, rural Ethiopia has not yet experienced major improvement. Although different rural development efforts have been made in Ethiopia, erratic policies implemented by the different political regimes across time emerge to be one of the main factors behind the poor performance of the of the rural sector. Further, while the Korean government’s rural development policy gave equal emphasis to improvement of agricultural production base as well as rural life improvement right from its inception, the Ethiopian rural development policy has rather neglected the rural life improvement aspect. Diversification of rural economy was also another priority area in Korea’s rural development policy through agro-processing, rural tourism, and non-farm employment opportunities whereas this has not been the case in Ethiopia’s rural development policy. We suggest some lessons that Ethiopia might adapt for its rural life improvement endeavors.
Cathodoluminescence spectroscopic study of the boron-nitrogen co-doping diamond films
Yuko Hatanaka,Sadao Takeuchi,Koji Iwasaki,Hidenori Gamo,Kiyoharu Nakagawa,Toshihiro Ando,Mikka Nishitani-Gamo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
Co-doping diamond is of scientific and technologically interest because a new electrical and/or optical property is expected to obtain. In this study, we have carried out a simultaneous addition of diborane and nitrogen in the gas phase for the growth of co-doping diamonds by microwave plasma-assisted chemical vapor deposition (MPCVD) method. We measured the cathodoluminescence (CL) spectra of the co-doping diamond films. To investigate the effect of boron-nitrogen co-doping addition on the CL spectra, we compared the CL spectra of boron-nitrogen co-doping diamonds with those of nitrogen-doped diamonds. The results revealed that the addition of boron suppressed the nitrogen incorporation into the CVD diamonds.
Kim, Wanjae,Gamo, Yuko,Sani, Yahaya Mohammed,Wusiman, Yimiti,Ogawa, Satoru,Karita, Shuichi,Goto, Masakazu Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.5
The present study examined the effects of Tween 80 on the attachment and hydrolytic activity of a cellulase enzyme against ball-milled cellulose (BMC), using the whole component (native CBH I) and the catalysis module (core CBH I) of carbohydrolase I purified from Trichoderma viride (Meicelase, Meiji Seika, Tokyo, Japan). The effects were evaluated as protein concentrations in the supernatant after mixing enzyme and substrate with Tween 80 at room temperature. Tween 80 decreased the adsorption of native CBH I and core CBH I onto BMC (p<0.001) and increased the amount of reducing sugars released from BMC by native CBH I (p<0.001). However, Tween 80 did not enhance the hydrolytic activity of core CBH I. Observations using SEM revealed that Tween 80 caused cellulose filter paper to swell and enhanced surface cracks and filaments caused by native CBH I but not by core CBH I. These results suggested that Tween 80 decreases enzyme adsorption to its substrate but enhances enzymatic activity.
Sar, C.,Santoso, B.,Gamo, Y.,Kobayashi, T.,Shiozaki, S.,Kimura, K.,Mizukoshi, H.,Arai, I.,Takahashi, J. Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.1
The objective of the present study was to determine whether ${\beta}$1-4 galacto-oligosaccharides (GOS) and Candida kefyr combined with nitrate as manipulators could suppress rumen methanogenesis without nitrate poisoning in sheep. Four rumen fistulated wethers were allocated to a $4{\times}4$ Latin square design. Nitrate (1.3 g $NaNO_3$ $Kg^{-0.75}$body weight) with and without GOS and Candida kefyr were administered into the rumen through fistula as a single dose 30 min after the morning meal. GOS and Candida kefyr were supplemented by sprinkling onto the feed and through rumen fistula, respectively. The four treatments consisted of saline, nitrate, nitrate plus GOS and nitrate plus GOS plus Candida kefyr. Physiological saline was used as the control treatment. Compared to saline treatment, the administration of nitrate alone resulted in a very marked decrease in rumen methanogenesis and an increase in rumen and plasma nitrite production and blood methaemoglobin formation consequently causing a decline in oxygen consumption, carbon dioxide production and metabolic rate. When compared to nitrate alone, the simultaneous administration of nitrate with GOS decreased nitrite accumulation in rumen and plasma and nitrate-induced methaemoglobin, while retaining low methane production. However, GOS could not fully restore metabolic parameters reduced by nitrate. When compared to the simultaneous administration of nitrate with GOS, the simultaneous administration of nitrate with GOS plus Candida kefyr lowered rumen methanogenesis to a negligible level, but did not decrease rumen and plasma nitrite accumulation as well as blood methaemoglobin formation. Thus, these results suggest that combination of nitrate with GOS may be a potent manipulator to suppress rumen methanogenesis with abating the hazards of nitratenitrite toxicity in ruminants.