منابع مشابه
The Naive Physics Perplex
ion in physical reasoning. Approximation and abstraction in physical reasoning takes many forms: Objects of complex characteristics can be approximated by objects of simpler characteristics (for example, a real resistor by an ideal resistor or a curved object by a polyhedral object), a group of objects can be approximated by a single object (figure 10), and a group of simple objects can be appr...
متن کاملThe Naive Physics Perplex
The \Naive Physics Manifesto" of Pat Hayes (1978) proposes a large-scale project of developing a formal theory encompassing the entire knowledge of physics of naive reasoners, expressed in a declarative symbolic form. The theory is organized in clusters of closely interconnected concepts and axioms. More recent work in the representation of commonsense physical knowledge has followed a somewhat...
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We summarize the results of VLBA and global VLBI observations of SS433 between 1995 and 2000. With these observations we resolve the inner jet of the source and identify an absorption region (∼ 25 AU), the " central radio gap ". The radio gap is caused by free-free absorption of the jet radio emission by a flattened outflow from the binary system. Radio emission is detected on 100 AU scales per...
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As one of the most intensively studied transcription factors, it is unsurprising that p53 is involved in many biological processes, including cell cycle arrest, DNA repair, senescence and apoptosis.1 its activities are mainly regulated by posttranslational modifications and interactions with other cellular components. Over the past few years, p53 has also been linked to redox homeostasis, the b...
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In recent years, numerous groups of investigators have reported primary aldosteronism (PAL) to be much more common than previously thought.1–4 This has followed recognition of the aldosterone/renin ratio (ARR) as an improved, more sensitive method of screening for PAL and the application of ARR testing to a wider population, to include normokalemic, as well as hypokalemic, hypertensive subjects...
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ژورنال
عنوان ژورنال: Nature
سال: 1987
ISSN: 0028-0836,1476-4687
DOI: 10.1038/328293a0