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The family Orussidae is a unique parasitoid group belonging to the suborder Symphyta. Members of Orussidae are rare and only a species, Orussus coreanus Takeuchi have been previously recorded from Korea. In this study, we report another species, Stirocorsia tosensis (Tosawa and Sugihara, 1934), for the first time from Korea. The adult characteristics of the species with illustrations and a species key to the Korean Orussidae are provided.
The family Liopteridae (Hymenoptera: Cynipoidea) is reported for the first time in Korea. We described two species, Paramblynotus kosugii Watanabe and Sakagami and Paramblynotus koreanus n. sp. A key to the species,descriptions, photographs of diagnostic characters, and host records are provided.
In an asymmetric two-dimensional electron gas system, the Rashba effective field arises due to the intrinsic electric field. Even without ferromagnetism, the Rashba spin splitting acts as a source of spin polarization and affects the transport property of the two-dimensional electron channel. In this Rashba channel, the magnetoresistance is determined by the vector alignment between the applied field and the bias current. In addition, the channel resistance for the parallel alignment between the applied field and the Rashba field is much smaller than that for the antiparallel alignment between them, which surprisingly agrees with the spin polarization induced by the Edelstein effect. This anisotropic magnetoresistance also allows us to estimate the spin polarization in a two-dimensional quantum well channel.
A sub-millimeter scale catalytic combustor with a simple plate-shaped combustion chamber was fabricated. A porous ceramics support coated with platinum catalyst was placed in the chamber. The combustor has a gallium arsenide window on the top that is transparent to infrared ray. The temperature distribution in the combustion chamber was measured using infrared thermal imager while hydrogen-air premixture is steadily supplied to the combustor. The area where the catalytic reaction took place broaden for higher flow rate and lower equivalence ratio made activated area in the combustion chamber broaden. The amount of coated platinum catalyst did not affect the reaction. Stop of reaction, which is similar to flame quenching of conventional combustion, was investigated. Large content of heat generation and broad activated area are essential criteria to prevent stop of reaction that has a bad effect on the combustor performance.
Background: Calcium phosphate (CaP) ceramics are one of the most valuable biomaterials for uses as the bone scaffold owing to their outstanding biocompatability, bioactivity, and biodegradation nature. In particular, these materials with an open porous structure can stimulate bone ingrowth into their 3-dimensionally interconnected pores. However, the creation of pores in bulk materials would inevitably cause a severe reduction in mechanical properties. Thus, it is a challenge to explore new ways of improving the mechanical properties of porous CaP scaffolds without scarifying their high porosity. Results: Porous CaP ceramic scaffolds with aligned pores were successfully produced using ceramic/camphene-based co-extrusion. This aligned porous structure allowed for the achievement of high compressive strength when tested parallel to the direction of aligned pores. In addition, the overall porosity and mechanical properties of the aligned porous CaP ceramic scaffolds could be tailored simply by adjusting the initial CaP content in the CaP/camphene slurry. The porous CaP scaffolds showed excellent in vitro biocompatibility, suggesting their potential as the bone scaffold. Conclusions: Aligned porous CaP ceramic scaffolds with considerably enhanced mechanical properties and tailorable porosity would find very useful applications as the bone scaffold.
In this study, NiCrAl metal foam was used as the support material. Rh/Al-Ce-Zr-based catalysts were also used as a reforming catalyst, and was coated over a metal foam plate using a rotary vacuum evaporator. The Al-Ce-Zr-based catalytic support material coated over a metal foam plate exhibited a nano-structured morphology. XRD showed that the cerium and zirconium components in the Al-Ce-Zr-based catalytic support material were synthesized in the CeZrO2 crystal structure. CeZrO2 prevents carbon deposition on the catalyst active site due to their high lattice oxygen mobility. The composition of hydrogen by diesel auto-thermal reforming increased with increasing reaction temperature, and 6, 12, and 43% was obtained at 600, 700, and 800oC, respectively. The fuel conversions were 20, 85, and 100%. A long-term activity test of the Rh/Al-Ce-Zr-based catalyst was carried out under the optimal auto-thermal reforming conditions. The composition of hydrogen and carbon monoxide in the dry-product gas was maintained at approximately 45% and 11% during 500 h, respectively. Therefore, the catalytic activity of Rh/Al-Ce-Zr based catalysts for diesel auto-thermal reforming is excellent. The carbon content on the surface of the catalysts after 100, 200, 300, 400, and 500 h reactions was investigated by EDX and no carbon deposition was observed.
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The purpose of this study is to introduce the math-clinic programs which offer to engineering students and to compare the subject satisfaction between participants and non-participants. Five math-clinic programs are operated and 1397 students took part in this study. As a result, the Likert-type scales of satisfaction with three programs; the exercise problems solving class, the tutoring program and the achievement tests, were 4.07, 4.05 and 3.95, respectively(5-point Likert-type scale). And we found that the participants expressed higher subject satisfactions than nonparticipations did.
우리나라는 1970년대 초 통일벼 생산과 더불어 쌀의 자급자족이 이루어지면서 쌀 산업은 매우 안정적으로 유지되어 오고 있다. 그러나 최근 우리나라 매년 의무 수입량이 늘어나면서 중저가 시장을 겨냥한 생산비 절감과 소비처 확대 방안이 시급한 과제로 대두되고 있다. 이에 국립식량과학원에서 육성한 자포니카 초다수 성 “한마음”벼의 최대수량을 위한 재식밀도 및 질소시비량을 구명하고자 시험을 수행한 결과를 요약하면 다음과 같다. 가. 출수기는 8월 14일로 재식밀도 및 질소시비량간에 차이가 없었다. 나. 출수기 벼 생육을 보면 질소시비량이 많을수록 경수는 많았으며, 엽질소 및 엽색은 N11㎏/10a 보다 N14.5㎏/10a 에서는 짙었으 나 그 이상에서는 비슷하였다. 지상부건물중과 엽면적은 질소시비량이 많을수록 많았다. 다. 질소시비량이 많을수록 도복지수가 높아 도복은 N18㎏/10a에서 1, N21.5㎏/10a에서 2 정도 발생되었다. 재식밀도간에는 재 식밀도가 높을수록 도복지수가 높아 도복 발생이 심했다. 라. 쌀수량은 N18㎏/10a까지 질소시비량이 많을수 록 증가하다가 N21.5㎏/10a에서는 감소하였으며, 재식밀도간에는 90>70>50주/3.3㎡ 순으로 많아, 최고수량은 N18㎏/10a에서 재식밀도는 90주/3.3M2 이었다. 이상의 결과로 볼 때, 자포니카 초다수성 “한마음”벼의 최대수 량을 위한 적정 재배법은 질소시비량 18kg/10a에 재식밀도 90주/3.3m2 이었다.