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Rho, M.S.,Lee, K.P. Pergamon Press 2016 Journal of insect physiology Vol.91 No.-
<P>Recent developments in insect gerontological and nutritional research have suggested that the dietary protein:carbohydrate (P:C) balance is a critical determinant of lifespan and reproduction in many insects. However, most studies investigating this important role of dietary P:C balance have been conducted using dipteran and orthopteran species. In this study, we used the mealworm beetles, Tenebrio molitor L. (Coleoptera: Tenebrionidae), to test the effects of dietary P:C balance on lifespan and reproduction. Regardless of their reproductive status, both male and female beetles had the shortest lifespan at the protein-biased ratio of P:C 5:1. Mean lifespan was the longest at P:C 1:1 for males and at both P:C 1:1 and 1:5 for females. Mating significantly curtailed the lifespan of both males and females, indicating the survival cost of mating. Age-specific egg laying was significantly higher at P:C 1:1 than at the two imbalanced P:C ratios (1:5 or 5:1) at any given age throughout their lives, resulting in the highest lifetime reproductive success at P:C 1:1. When given a choice, beetles actively regulated their intake of protein and carbohydrate to a slightly carbohydrate-biased ratio (P:C 1:1.54-1:1.64 for males and P:C 1:1.31:1.36 for females). The self-selected P:C ratio was significantly higher for females than males, reflecting a higher protein requirement for egg production. Collectively, our results add to a growing body of evidence suggesting the key role played by dietary macronutrient balance in shaping lifespan and reproduction in insects. (C) 2016 Elsevier Ltd. All rights reserved.</P>
Highly conductive and dispersible graphene and its application in P3HT-based solar cells
Mahmoudi, Tahmineh,Rho, Won-Yeop,Yang, Hwa-Young,Silva, S. Ravi P.,Hahn, Yoon-Bong The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.63
<P>A simple reduction method without the need for high-temperature annealing is proposed for highly conductive and dispersible graphene sheets. This method consists of the grafting of graphene oxide (GO) with 1-pyrenecarboxylic acid (PCA) and the exothermic reduction of the PCA-grafted GO, followed by an endothermic decarboxylation with refluxing hot water. The PCA-grafted reduced graphene oxide (PCA-rGO) has a high conductivity of ∼1.52 × 10<SUP>5</SUP> S m<SUP>−1</SUP>. Upon incorporating the rGO-PCA in active and electron transport layers of organic solar cells, compared to P3HT-only devices (0.18%) a 16-fold increase in the power conversion efficiency (2.85%) is obtained, attributed to a substantial increase in the short-circuit current density from 0.017 to 12.09 mA cm<SUP>−2</SUP>.</P> <P>Graphic Abstract</P><P>Structure of an inverted solar cell with the P3HT–PCA-rGO hybrid in the active layer and graphene oxide as the hole transport layer. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc03692a'> </P>
安桂洙,權炳善,盧承杓,五斗一郎 순천대학교 기초과학연구소 1990 基礎科學硏究誌 Vol.1 No.-
In order to obtain basic information for breeding varieties of forage rape which is suitable at the southern part of Korea, seventeen introduced varieties were grown from Sep. 1986 May 1987 at mokpo Branch Station. Crop Experiment Station, and yield components and nutrient quality of plants were observed. The results obtained are summarized as follows: 1. Forage rape cv. Velox showed higher dry matter yield than any other variety in the experiment. It showed relatively high content of crude protein and in vitro dry matter digestibility(IVDMD) and low content of NDF. ADF, cellulose and lignin. Therefore, it was concluded that Velox was the most suitable variety with high yield and high nutrient quality at the southern part of Korea. 2. The heritabilities of all the observed characters but hemicellulose were estimated to be large. 3. Total dry matter yield showed highly significant positive correlations with plant length, stem diameter, number of main stem leaves, fresh yield, stem dry(DDMY). These characters mentioned above showed negative correlations with content of NDF, ADF, cellulose and lignin. 4. According to the result of path coefficient analysis, characters highly correlated with total dry matter yield showed large direct effects on total dry matter yield.
사초용유채 ( Brassica napus Subsp . oleifera ) 의 생산성과 사료가치에 관한 연구 1 . 남부지역에 적응한 사초용유채의 품종선발
안계수(G . S . Ahn),권병선(B . S . Kwon),노승표(S . P . Rho),오두일랑(I . Goto) 한국축산학회 1989 한국축산학회지 Vol.31 No.3
In order to obtain basic information for breeding varieties of forage rape which is suitable at the southern part of Korea, seventeen introduced varieties were grown from Sep. 1986 to May 1987 at Mokpo Branch Station, Crop Experiment Station, and yield components and nutrient quality of plants were observed. The results obtained are summarized as follows: l. Forage rape cv. Velox showed higher dry matter yield than any other variety used in the experiment. It showed relatively high content of crude protein and in vitro dry matter digestibility(IVDMD) and low content of NDF, ADF, cellulose and lignin. Therefore, it was concluded that Velox was the most suitable variety with high yield and high nutrient quality at the southern part of Korea. 2. The heritabilities of all the observed characters but hemicellulose were estimated to be large. 3. Total dry matter yield showed highly significant positive correlations with plant length, stem diameter, number of main stem leaves, fresh yield, stem dry matter yield, leaf dry matter yield, in vitro dry matter digestibility(IVDMD) and digestible dry matter yield(DDMY). These characters mentioned above showed negative correlations with content of NDF, ADF, cellulose and lignin. 4. According to the result of path coefficient analysis, characters highly correlated with total dry matter yield showed large direct effects on total dry matter yield.
Optimum Design of a Non - Destructive Testing System to Maximize Magnetic Flux Leakage
G. S. Park,P. W. Jang,Y. W. Rho 한국자기학회 2001 Journal of Magnetics Vol.6 No.1
This paper describes the design method of a magnetic system to maximize the magnetic flux leakage (MFL) in a non-destructive testing (NDT) system. The defect signals in a MFL type NDT system mainly depend on the change of the magnetic leakage flux in the region of a defect. The characteristics of the B-H curves are analyzed and a design method to define the operating point on B-H curves for maximum leakage is performed. The computed MFL signal by a nonlinear finite element method is verified by measurement using Hall sensors mounted on the 6 legs PIG, the traveling detector unit in gas pipe, in an 8 inch test tube with defects. The rhombic defects could be successfully identified from the defect signals.