منابع مشابه
The lonely eye.
A lthough the dinosaurs are gone, extant vertebrates provide clues to the development of photorecep-tion among the clades that probably preceded and then radiated into the dinosaurs. The ancient order Rhyncho-cephalia, which includes Sphenodon as its only family, with two surviving species, had its heyday between 200 million and 100 million years ago. While this order is reptilian, these creatu...
متن کاملLonely receptors kill cells
high-cholesterol diet can be the fast track to a heart attack. But scientists are only now discovering that one of cholesterol’s most damaging effects might stem from its ability to make blood cells self-destruct. The findings appear in a pair of recent studies directed by Ira Tabas (Columbia University, New York, NY). Cholesterol is abundant in atherosclerotic lesions, which become most danger...
متن کاملThe " Lonely Gamer " Revisited Title the " Lonely Gamer " Revisited
World of Warcraft (WoW) is a massively multiplayer online game (MMO) supporting rich and complex social interactions among over 8 million players worldwide. In this study, we explore implications of the pervasive “lonely gamer” stereotype, which portrays online gamers as socially isolated and addicted young people, usually male, with few real-life (RL) social ties. This is the first study to di...
متن کاملWorn Tool Forces Based on Ploughing Stresses
Recent work in modeling of the ploughing mechanism in basic metal machining may provide a means of estimating the additional forces to be expected when cutting with a worn tool. The results predict the rubbing stresses due to the finite radius of an unworn tool edge. Since an unworn tool can be thought of as a worn tool with a wear land width VB = 0, these stresses can make up part of a strateg...
متن کاملA Slip-line Field for Ploughing during Orthogonal Cutting
Under normal machining conditions, the cutting forces are primarily due to the bulk shearing of the workpiece material in a narrow zone called the shear zone. However, under finishing conditions, when the uncut chip thickness is of the order of the cutting edge radius, a ploughing component of the forces becomes significant as compared to the shear forces. Predicting forces under these conditio...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature
سال: 1990
ISSN: 0028-0836,1476-4687
DOI: 10.1038/344606a0