Australian Throwing-Sticks, Throwing-Clubs, and Boomerangs
نویسندگان
چکیده
منابع مشابه
A study of traditionnal throwing sticks and boomerang tuning
The first thing we could see about throwing sticks1 is their curved shapes. Though, even if their curved shape stabilise their flight by lowering their center of gravity, this seeming parameter isn't the only one to govern their trajectory. Others parameters, like their airfoil cross section, blade wideness, thickness, surface, and mass are also decisive. One another parameter less studied in d...
متن کاملSticks and Clubs
We study combinatorial principles known as stick and club. Several variants of these principles and cardinal invariants connected to them are also considered. We introduce a new kind of side-by-side product of partial orderings which we call pseudo-product. Using such products, we give several generic extensions where some of these principles hold together with ¬CH and Martin’s Axiom for counta...
متن کاملDevelopmental gender differences for overhand throwing in Aboriginal Australian children.
In a review of 46 meta-analyses of gender differences, overhand throwing had the largest gender difference favoring boys (ES > 3.0). Expectations for gender-specific performances may be less pronounced in female Australian Aborigines, because historical accounts state they threw for defense and hunting. Overhand throwing velocities and kinematics were recorded in 30 female and male Aboriginal A...
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Chemokines play a key role in directing and driving leucocyte trafficking. The efficient regulation of leucocyte recruitment by chemokines requires their appropriate localization in functional micro-anatomical domains, as well as setting limits to their effects in space and time. Both processes are influenced by silent chemokine receptors (interceptors), including DARC (Duffy antigen receptor f...
متن کاملSpatial ability and throwing accuracy.
In an attempt to explain the superior spatial skill of males, several studies have investigated the hypothesis that spatial ability is enhanced by an Xlinked recessive gene. Some of the evidence based on intrafamilial correlations supports the X-linkage hypothesis of superior male spatial ability (Stafford, 1961 ; Hartlage, 1970; Bock and Kolakowski, 1973; Yen, 1975) while more recent work, inc...
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ژورنال
عنوان ژورنال: American Anthropologist
سال: 1936
ISSN: 0002-7294,1548-1433
DOI: 10.1525/aa.1936.38.1.02a00080