منابع مشابه
A new Eocene swift-like bird with a peculiar feathering
A new taxon of swift-like birds is described from the Middle Eocene of Messel (Germany). It is tentatively assigned to the extinct family Jungornithidae and exhibits a completely unexpected feathering, which contrasts sharply with that of recent swifts. The short and rounded wings clearly show that it was not adapted to gliding, but might have caught its prey by sallying flights from a perch. T...
متن کاملThree-dimensional trajectories and network analyses of group behaviour within chimney swift flocks during approaches to the roost
Chimney swifts (Chaetura pelagica) are highly manoeuvrable birds notable for roosting overnight in chimneys, in groups of hundreds or thousands of birds, before and during their autumn migration. At dusk, birds gather in large numbers from surrounding areas near a roost site. The whole flock then employs an orderly, but dynamic, circling approach pattern before rapidly entering a small aperture...
متن کاملBasic Solar Chimney Flow Improvements
Preliminary note This paper deals with the numerical analysis procedure and results of flow simulation through solar chimney. Because of relatively low Reynolds numbers, some aerodynamic improvements could be obtained. The paper links input heat energy with geometry or air flow parameters. Basic solar chimney geometry is carried out and analyzed with CFD application in three dimensional domain....
متن کاملThe use of common swift (Apus apus), an aerial feeder bird, as a bioindicator of persistent organic microcontaminants.
SUMMARY In this study we investigated the accumulation of polychlorobiphenyls (PCBs), polychlorodibenzo-p-dioxins (PCDDs), polychlorodibenzofurans (PCDFs), and the chlorinated pesticides 1,1-dichloro-2,2-bis(4-chlorophenyl)-ethene (DDE), 1,1,1-trichloro-2,2-bis(4-chlorophenyl)-ethane (DDT), and hexachlorobenzene (HCB) in the breast muscle, liver, lung, heart and brain tissues of adult common sw...
متن کاملSpectroscopic SWIFT
INTRODUCTION Often the ability to obtain chemical-shift information is needed and advantageous in MRI. In addition to providing chemical information, the acquired spectral dimension can also be used to reduce image blur resulting from frequency shifts of all types. This work describes a new 3D and 4D spectroscopic technique involving an intrinsic frequency dimension. The method is based on an o...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1958
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay2817