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Impact of Climate Change on Corn Production in Dangbe East District of Ghana
( George Blay Twumasi ),( Ahmad Mirza Junaid ),( Li Ting ),( Taehwa Lee ),( Yongchul Shin ),( Kyung Sook Choi ) 한국농공학회 2016 한국농공학회 학술대회초록집 Vol.2016 No.-
The study was carried out to examine the impact of climate change on corn production in the Dangbe East District of Ghana. Analysis of long-term (1992-2013) trends of rainfall during the growing season (i.e. March and July) in the study area showed that about 70% of the seasons were below the long-term average, with an all-time low occurring in the year 2004. Although the wettest years (1997 and 2009) had relatively higher percentages above the long-term average (169% and 163%) compared to the lower percentages (40% and 57%) of the driest years (2004 and 1992), the latter were relatively lesser in numbers (i.e. 30%). Mean seasonal temperatures however, did not show high variation from the long-term mean implying that rainfall was the main cause of yield variation in the area. Therefore, two climate scenarios were assumed: Scenario A involved reduced rainfall and elevated temperature, while scenario B involved elevated rainfall and reduced temperature. Aquacrop model (Ver. 4) was evaluated using 22 years of observed corn yield and it produced reasonable estimates of grain yield. The model was then used to predict corn yield under 20% depletion of rainfall and 7°C temperature rise (Scenario A) and 20% rise in rainfall and 7°C depletion (Scenario B). Under scenario A, the predicted corn yield ranged between 0.215-1.391 ton/ha which represents a drop of 83% while yield ranged from 1.611 to 2.595 ton/ha representing a yield increase of 61% under Scenario B. Adaptation measures are given as management recommendations in line with the climatic changed scenarios.
Jr, John Blay,Yoloye, Victor The Korean Society for Integrative Biology 1987 동물학회지 Vol.30 No.2
나이제리아의 middle belt지역의 2개 저수지와 3개 하천에서 Aspatharia sinuata의 생장양상을 조사하였다. 가장 생장이 빠른 곳은 Oyun저수지와 Agbuur강이었으며, 가장 느린 곳은 Asa저수지와 Oyun강이었다. Walford plot에 의한 분석결과에 의하면 이 조개의 이론적 최대 길이는 Asa저수지가 7.39, Oyun저수지 9.65, Oyun강 6.75, Odo-Otin강 7.60, Agbuur강 9.86이었다. 일반적으로 생장은 초기 2년 사이가 빨랐고, 그 후는 생장속도가 낮아졌다. Asa저수지에서의 방사실험 결과에 의하면 패각에는 주생장선이 1년에 하나씩 형성되는 것으로 나타났다. 그리고 연례적인 수위저하와 그로 인한 하면 및 투명도의 감소가 이 조개의 생장을 억제하는 주요인이 되는 것으로 보였다.
A Further Generalization of Apostol-Bernoulli Polynomials and Related polynomials
( R Trem Blay ),( S Gab Oury ),( J Fug Ere ) 호남수학회 2012 호남수학학술지 Vol.34 No.3
The purpose of this paper is to introduce and investigate two new classes of generalized Bernoulli and Apostol-Bernoulli polynomials based on the de nition given recently by the authors [29]. In particular, we obtain a new addition formula for the new class of the generalized Bernoulli polynomials. We also give an ex- tension and some analogues of the Srivastava-Pinter addition theorem [28] for both classes. Finally, by making use of the new addition formula, we exhibit several interesting relationships between generalized Bernoulli polynomials and other polynomials or special functions.
Iltis, Xaviere,Drouan, Doris,Blay, Thierry,Zacharie, Isabelle,Sabathier, Catherine,Onofri, Claire,Steyer, Christian,Schwarz, Christian,Baumeister, Bruno,Allenou, Jerome,Stepnik, Bertrand,Petry, Winfri Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8
Within the frame of the EMPIrE test, four monolithic mini-plates were irradiated in the ATR reactor. In two of them, the monolithic U(Mo) foil had been PVD-coated with Zr before the plate manufacturing. Extensive microstructural characterizations were performed on a fresh archive mini-plate, using Optical Microscopy (OM), Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectroscopy (EDS), Electron Backscattered Diffraction (EBSD) and Focused Ion Beam (FIB)/Transmission Electron Microscopy (TEM) with nano EDS. A particular attention was paid to the examination of the U(Mo) foil, the PVD coating, the cladding/Zr and Zr/U(Mo) interfaces. The Zr coating has a thickness around 15 ㎛. It has a columnar microstructure and appears dense. The cohesion of the cladding/Zr and Zr/U(Mo) interfaces seems to be satisfactory. An almost continuous layer with a thickness of the order of 100-300 nm is present at the cladding/Zr interface and corresponds to an oxidized part of the Zr coating. At the Zr/U(Mo) interface, a thin discontinuous layer is observed. It could correspond to locally oxidized U(Mo). This work provides a basis for interpreting the results of characterizations on EMPIrE irradiated plates.
J. Noirot,I. Zacharie-Aubrun,T. Blay 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Focused ion beamescanning electron microscope and electron backscattered diffraction examinationswere conducted in the center of a 73 GWd/tU UO2 fuel. They showed the formation of subdomains withinthe initial grains. The local crystal orientations in these domains were close to that of the original grain. Most of the fission gas bubbles were located on the boundaries. Their shapes were far from spherical andfar from lenticular. No interlinked bubble network was found. These observations shed light on previousunexplained observations. They plead for a revision of the classical description of fission gas releasemechanisms for the center of high burn-up UO2. Yet, complementary detailed observations are needed tobetter understand the mechanisms involved
Moses Adeolu Adebayo,Abebe Menkir,Malaku Gedil,Essie Blay,Vernon Gracen,Eric Danquah,Ladejobi Funmilayo 한국작물학회 2015 Journal of crop science and biotechnology Vol.18 No.3
Knowledge about the genetic diversity within a germplasm allows for a more effective and efficient use of resources for crop improvement programs. Diversity assessment of 48 tropical drought-tolerant maize inbreds, 24 each from CIMMYT and IITA, was carried out with microsatellite markers to determine the genetic divergence between the two groups of maize inbred lines. Eighty-one polymorphic SSR markers were used for the assessment. Results showed that the average number of alleles per locus was 3.7. The mean polymorphic information content (PIC) was 0.51 whereas the average modified Roger’s genetic distance (MRD) was 0.49. The mean genetic distance estimates between the CIMMYT and IITA lines were higher than the mean genetic distance among IITA lines or among CIMMYT lines. The average linkage cluster analysis separated the lines into two broad groups along institutional lines. The observed sub-groups within each main group were reflections of the relationships of the lines based on pedigree records. The FST value of 19.5% reflects a high level of genetic differentiation between the two groups of lines. The results highlighted the presence of appreciable genetic divergence between CIMMYT and IITA lines that can be exploited for superior hybrid maize development.
죠지 블레이 투마시,아흐메드 미르자 주네이드,신용철,최경숙,Twumasi, George Blay,Junaid, Ahmad Mirza,Shin, Yongchul,Choi, Kyung Sook The Korean Society of Agricultural Engineers 2017 한국농공학회논문집 Vol.59 No.1
Climate change phenomenon is posing a serious threat to sustainable corn production in Ghana. This study investigated the impacts of climate change on the rain-fed corn yield in the Dangme East district, Ghana by using Aquacrop model with a daily weather data set of 22-year from 1992 to 2013. Analysis of the weather data showed that the area is facing a warming trend as the numbers of years hotter and drier than the normal seemed to be increasing. Aquacrop model was assessed using the limited observed data to verify model's sufficiency, and showed credible results of $R^2$ and Nash-Sutcliffe efficiency (NSE). In order to simulate the corn yield response to climate variability four climate change scenarios were designed by varying long-term average temperature in the range of ${\pm}1^{\circ}C{\sim}{\pm}3^{\circ}C$ and average annual rainfall to ${\pm}5%{\sim}{\pm}30%$, respectively. Generally, the corn yield was negatively correlated to temperature rise and rainfall reduction. Rainfall variations showed more prominent impacts on the corn yield than that of temperature variations. The reduction in average rainfall would instantly limit the crop growth rate and the corn yield irrespective of the temperature variations.