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Evans, U. R.,Taylor, C. A. J.,장현구 한국부식학회 1972 Corrosion Science and Technology Vol.1 No.1
The present paper describes a research on Atmospheric Rusting, which has been in progress for 5 years in the Department of Metallurgy at Cambridge University. The discussion is designed to present the connection between the electrochemical mechanism of atmospheric corrosion with that of corrosion un her immersed conditions.
Evans, D. F.,Southworth, J.,Smalley, B.,Jørgensen, U. G.,Dominik, M.,Andersen, M. I.,Bozza, V.,Bramich, D. M.,Burgdorf, M. J.,Ciceri, S.,D’Ago, G.,Figuera Jaimes, R.,Gu, S.-H.,Hinse, T. C.,Henning, Th Springer-Verlag 2018 Astronomy and astrophysics Vol.610 No.-
<P><I>Context.</I> The formation and dynamical history of hot Jupiters is currently debated, with wide stellar binaries having been suggested as a potential formation pathway. Additionally, contaminating light from both binary companions and unassociated stars can significantly bias the results of planet characterisation studies, but can be corrected for if the properties of the contaminating star are known.</P><P><I>Aim.</I> We search for binary companions to known transiting exoplanet host stars, in order to determine the multiplicity properties of hot Jupiter host stars. We also search for and characterise unassociated stars along the line of sight, allowing photometric and spectroscopic observations of the planetary system to be corrected for contaminating light.</P><P><I>Methods.</I> We analyse lucky imaging observations of 97 Southern hemisphere exoplanet host stars, using the Two Colour Instrument on the Danish 1.54 m telescope. For each detected companion star, we determine flux ratios relative to the planet host star in two passbands, and measure the relative position of the companion. The probability of each companion being physically associated was determined using our two-colour photometry.</P><P><I>Results.</I> A catalogue of close companion stars is presented, including flux ratios, position measurements, and estimated companion star temperature. For companions that are potential binary companions, we review archival and catalogue data for further evidence. For WASP-77AB and WASP-85AB, we combine our data with historical measurements to determine the binary orbits, showing them to be moderately eccentric and inclined to the line of sight (and hence planetary orbital axis). Combining our survey with the similar Friends of Hot Jupiters survey, we conclude that known hot Jupiter host stars show a deficit of high mass stellar companions compared to the field star population; however, this may be a result of the biases in detection and target selection by ground-based surveys.</P>
Vacuum alignment and phase structure of holographic bi-layers
Evans, N.,Kim, K.Y. North-Holland Pub. Co 2014 Physics letters. Section B Vol.728 No.-
We study the D3/probe D5 system with two domain wall hypermultiplets. The conformal symmetry can be broken by a magnetic field, B (or running coupling), which promotes condensation of the fermions on each individual domain wall. Separation of the domain walls promotes condensation of the fermions between one wall and the other. We study the competition between these two effects showing a first order phase transition when the separation is ~0.56λ<SUP>¼</SUP>B<SUP>-½</SUP>. We identify extremal brane configurations which exhibit both condensations simultaneously but they are not the preferred ground state.
Evans, Joshua R.,Chapuis, Iara S.,Vis, Morgan L. The Korean Society of Phycology 2017 ALGAE Vol.32 No.3
The strictly freshwater red algal order Batrachospermales has undergone numerous taxonomic rearrangements in the recent past to rectify the paraphyly of its largest genus Batrachospermum. These systematic investigations have led to the description of new genera and species as well as re-circumscription of some taxa. Specimens collected from two locations in the southeastern USA were initially identified as being allied to Batrachospermum sensu lato, but could not be assigned to any recognized species. Representative rbcL (plastid) and COI-5P (mitochondrion) sequences showed these specimens to be similar to each other and not closely matching the previously published sequence data for other Batrachospermum taxa. Comparison of sequence variation and morphology with a broader range of batrachospermalean taxa resulted in the proposal of a new monotypic genus Lympha mucosa gen. et sp. nov. to accommodate these specimens. Lympha mucosa is sister to members of a newly described genus Volatus, but the two genera are easily distinguished based on straight versus curved, twisted or spirally coiled carpogonial branch, respectively. This new taxon has morphological similarities to Batrachospermum sections Turfosa and Virescentia, but can be differentiated based on genetic divergence in rbcL and COI-5P as well as a combination of morphological characters: dense, compressed whorls, axial carposporophytes with a single type of gonimoblast filament; cortication of the main axis closely appressed; and short, straight carpogonial branch arising from the pericentral cell and carpogonia with unstalked, lanceolate trichogynes. This new taxon adds to the freshwater red algal diversity of the southeastern USA, a region already known for biodiversity and high endemism of the aquatic flora and fauna. It is also a relevant new addition to the taxonomic knowledge of the freshwater red algal Batrachospermales.
Evans D. Kitcher,Jeremy M. Osborn,Sunil S. Chirayath 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.5
A recently published nuclear forensics methodology for source discrimination of separated weaponsgradeplutonium utilizes intra-element isotope ratios and a maximum likelihood formulation to identifythe most likely source reactor-type, fuel burnup and time since irradiation of unknown material. Sensitivity studies performed here on the effects of random measurement error and the uncertainty inintra-element isotope ratio values show that different intra-element isotope ratios have disproportionatecontributions to the determination of the reactor parameters. The methodology is robust to individualerrors in measured intra-element isotope ratio values and even more so for uniform systematic errorsdue to competing effects on the predictions from the selected intra-element isotope ratios suite. For aunique sample-model pair, simulation uncertainties of up to 28% are acceptable without impedingsuccessful source-reactor discrimination. However, for a generic sample with multiple plausible sourceswithin the reactor library, uncertainties of 7% or less may be required. The results confirm the critical roleof accurate reactor core physics, fuel burnup simulations and experimental measurements in the proposedmethodology where increased simulation uncertainty is found to significantly affect the capabilityto discriminate between the reactors in the library.
( Evans Atuti Atera ),( Kazuyuki Itoh ),( Tetsushi Azuma ),( Takashige Ishii ) 한국잡초학회 2012 Weed Biology and Management Vol.12 No.1
Witchweed, Striga hermonthica (hereafter, referred to as "Striga"), is a major biotic constraint to cereal production in sub-Saharan Africa.The parasitic plant is a socioeconomic problem that has forced some resource-poor farmers to abandon their farms due to high infestation. This study was designed in order to elucidate farmers` perceptions of Striga control measures and to determine their potential adoption in two villages in western Kenya. Participatory rural appraisals and individual interviews were conducted in 2009 and 2010 in a sample of 128 and 120 households in Kaura and Kogweno-Oriang villages in Homabay and Rachuonyo districts, respectively. The results revealed that crop production was the main occupation in most households.The farmers identified Striga as one of the major constraints to maize, sorghum, and finger millet production. According to the farmers, the most popular control measures were hand-pulling, crop rotation, and intercropping, even though rotational systems might need a longer timeframe to reduce the soil seed bank of Striga.Although the level of Striga infestation and damage were increasing in the farmers` fields, the adoption of the control options was limited.The reason for the low adoption level of the control methods by the farmers is because they are "too risky" as there is no guarantee of a direct pay-off in increased crop yield. Farmer-led evaluation and adaptation of the various Striga control technologies in real-life situations will facilitate the choice of appropriate options and facilitate their uptake.