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Distribution models of invasive plants are very useful tools for conservation management. There are challenges in modeling expanding populations, especially in a dynamic environment, and when data are limited. In this paper, predictive habitat models were assessed for three invasive plant species, at differing levels of occurrence, using two different habitat modeling techniques: logistic regression and maximum entropy. The influence of disturbance, spatial and temporal heterogeneity, and other landscape characteristics is assessed by creating regional level models based on occurrence records from the USDA Forest Service’s Forest Inventory and Analysis database. Logistic regression and maximum entropy models were assessed independently. Ensemble models were developed to combine the predictions of the two analysis approaches to obtain a...
The 21-micron contour map of M17 is similar to radio maps with three components. Measured flux densities give color temperatures of both 240 and 75 K for the two principal components of M17 and 44 to 63 K for Sgr B2, NGC 2024, and DR-21.
Comment: 19 pages, 13 figures, to be published in the A&A Main Journal
Comment: 6 pages, to appear in the proceedings of the conference "ISO beyond point sources"
Comment: 8 pages, to appear in the proceedings of the conference 'ISO surveys of a dusty universe', held at Ringberg Castle November 1999
Comment: 9 pages. 12 figures, accepted by A&A
Comment: 10 pages, 12 figures. Accepted for publication in Astronomy & Astrophysics
Comment: A&A accepted; FITS files and appendices are available at: http://www.konkoly.hu/staff/pkisscs/confnoise/
A stressed Ge:Ga infrared detector was tested in various operating conditions. Background-limited performance was demonstrated at photon backgrounds down to less than 10 to the 8th photon/s sq cm. The optimal operational parameters were determined.
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