939 resultados para Designs For Interference And Competition
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The VISIR instrument for the European Southern Observatory (ESO) Very Large Telescope (VLT) is a thermal-infrared imager and spectrometer currently being developed by the French Service d'Astrophysique of CEA Saclay, and Dutch NFRA ASTRON Dwingeloo consortium. This cryogenic instrument will employ precision infrared bandpass filters in the N-( =7.5-14µm) and Q-( =16-28µm) band mid-IR atmospheric windows to study interstellar and circumstellar environments crucial for star and planetary formation theories. As the filters in these mid-IR wavelength ranges are of interest to many astronomical cryogenic instruments, a worldwide astronomical filter consortium was set up with participation from 12 differing institutes, each requiring instrument specific filter operating environments and optical metrology. This paper describes the design and fabrication methods used to manufacture these astronomical consortium filters, including the rationale for the selection of multilayer coating designs, temperature-dependant optical properties of the filter materials and FTIR spectral measurements showing the changes in passband and blocking performance on cooling to <50K. We also describe the development of a 7-14µm broadband antireflection coating deposited on Ge lenses and KRS-5 grisms for cryogenic operation at 40K
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A determinação das relações competitivas entre espécies de plantas requer delineamentos experimentais e métodos de análise apropriados. A hipótese da pesquisa foi que duas espécies crescendo em convivência têm comportamento de crescimento e desenvolvimento distintos em função da sua competitividade relativa. O objetivo desta pesquisa foi quantificar a competitividade relativa da cultura do trigo com o capim-marmelada através da medida dos efeitos da densidade e da proporção de plantas, usando experimentos em série substitutiva. Monoculturas foram cultivadas em densidades de 1, 3, 5, 10 e 15 plantas por caixa e analisadas por regressão dos dados de massa seca, em 2006. Experimento em mistura foi cultivado nas proporções trigo:capim-marmelada de 0:6, 1:5, 2:4, 3:3, 4:2, 5:1 e 6:0 plantas por caixa e analisado através de interpretação gráfica de características de crescimento e produção, em 2007. Ambos os experimentos foram realizados em delineamento completamente casualizado com quatro repetições. Capim-marmelada foi mais sensível que trigo à competição intraespecífica. Capim-marmelada foi levemente mais competitivo que trigo. Número e massa de espigas e número de afilhos foram as características do trigo mais afetadas pela interferência do capim-marmelada.
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The first case of interference competition through soil dumping in South America is documented between Ectatomma quadridens and Pheidole fallax in Amazonian forest clearings. Workers of the diurnally active E. quadridens arrive at nests of P. fallax at dawn, and begin to fill up nest entrances with soil. During the day, E. quadridens workers remain stationary on the closed nest of P. fallax, and fill soil at the first signs of nest openings. Colonies of P. fallax distant from E. quadridens nests are active for 24 hrs; those near E. quadridens nests are limited for foraging nocturnally after opening nest entrances. This pattern was not found between heterospecific colonies at greater distances from the camp midden, according with the prediction that interference competition is more probable as resources become more concentrated. Colonies of P. fallax near E. quadridens nests located near the camp midden had a net forage intake of 60% of those located in areas without E. quadridens. -Author
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[Schematic Design Drawing of East Elevation and] East-West Section. Black ink, colored ink and pencil drawing with marker coloring on two blue-line prints, 8 1/4 x 38 & 15 x 41 1/4 inches [from photographic copy by Lance Burgharrdt]
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[Schematic Design Drawing of] East Elevation. Black and colored ink and pencil drawing with marker coloring on two blue-line prints, 9 1/4 x 38 & 9 1/2 x 41 1/2 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Brown ink sketch on tracing paper, 18x28 iinches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Ink sketch with marker coloring on tracing paper, 18 x 37 1/2 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Blue pencil sketch on tracing paper, 18 x 37 1/2 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Ink and blue, orange and green pencil sketch on tracing paper, 18x37 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketches], untitled. Ink sketches on tracing paper, 12x24 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketches], untitled. Ink sketches on tracing paper, 18x22 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Ink sketch with marker coloring on tracing paper, 18x38 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Ink sketch on tracing paper, 12 x 32 1/4 inches [from photographic copy by Lance Burgharrdt]
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[Conceptual Sketch], untitled. Ink sketch with yellow marker coloring on tracing paper, 12x29 inches [from photographic copy by Lance Burgharrdt]
