نتایج جستجو برای: sparrows
تعداد نتایج: 1328 فیلتر نتایج به سال:
A study of the coexistence of sparrows in grassland and woodland habitats of the Research Ranch in southeastern Arizona supports the predictability of current community theory. For each of the habitats studied, the production of seeds and the abundance of seed-eating, winter-resident sparrows were measured. The theory correctly predicts the number of species supported in each of the habitats. I...
The genus Spizella (Bonaparte) contains seven species of North American sparrows in the recently resurrected family Passerellidae (Bock 1994; Barker et al. 2013), formerly placed in the Emberizidae, and includes a few of the region's most common and familiar bird species. Spizella sparrows occupy more or less open habitats; most species are at least partially migratory and form small flocks whe...
Chilled water systems have large time delays and inertia, the traditional PID controller has a poor control effect. In this paper, an improved sparrow search algorithm is proposed to optimize of chilled systems. Firstly, random walk strategy was used randomly perturb sparrows improve searching ability sparrows. Then, Gauss mutation added in iteration process enhance local ability. Finally, valu...
Nasal turbinates or swabs were collected from wild ducks, geese, owls, sparrows, swallows, and starlings and from sentinel ducks placed next to turkey farms experiencing avian pneumovirus (APV) infections and were analyzed for APV genome and infectious particles. APV RNA was detected in samples examined from geese, sparrows, and starlings. APV RNA and antibodies were also detected in two differ...
—We studied wintering grassland bird communities in De Soto National Forest in southern Mississippi, USA to assess differences in bird communities and vegetation structure among different stand types. We also examined which vegetation structure and plant species predicted occurrence of Bachman’s Sparrow (Peucaea aestivalis), Henslow’s Sparrow (Ammodramus henslowii), and Sedge Wren (Cistothorus ...
The Ulm Sparrows team is an student-oriented, interdisciplinary research effort at the University of Ulm. The team is active in both the simulation and the middle-size league, but simulation efforts are targeted towards supporting the middle-size league robot team. We competed in the RoboCup World Championships in Paris (1998) [5] and Stockholm (1999, quarterfinals) [7], the European RoboCup Ch...
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