Further Investigation of Changes in Cometary Rotation
نویسندگان
چکیده
منابع مشابه
Rotation of Cometary Nuclei
The current understanding of cometary rotation is reviewed from both theoretical and observational perspectives. Rigid-body dynamics for principal axis and non-principal-axis rotators are described in terms of an observer’s point of view. Mechanisms for spin-state changes, corresponding timescales, and spin evolution due to outgassing torques are discussed. Different observational techniques an...
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I discuss our current understanding of the spin states of cometary nuclei. Cometary spin influences the temporal and spatial patterns of outgassing from the nucleus (through diurnal and seasonal effects) and is in turn influenced by outgassing-driven torques. The current challenge to cometary astronomers is to quantify the interactions between the spin, the outgassing, and the resultant torques...
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the present study aimed to investigate representation of discourse markers and metadiscourse markers in conversations and readings of general elt coursebook series used in the language centers of iran. to this aim, four elt coursebooks popularly taught in language centers of this country were analyzed based on fung and carter’s (2007) framework regarding discourse markers and hyland’s (2005) fr...
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Ankle rotation changes and its influences in knee osteoarthritis
Background : Biomechanical factors are known to be important in knee osteoarthritis (OA) development and progression. This study was designed to determine changes of hamstrings muscle activation, knee adduction moment and ankle rotation angle in two knee osteoarthritis (mild and moderate) and a healthy control group. Methods: 16 females (10 with mild and 6 with moderate medial knee osteoart...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 2018
ISSN: 1538-3881
DOI: 10.3847/1538-3881/aad0a1