Brilliant pebbles won't do
نویسندگان
چکیده
منابع مشابه
Brilliant Pebbles: a Method for Detection of Very Large Interstellar Grains
A photon of wavelength λ ∼ 1μm interacting with a dust grain of radius ap ∼ 1mm – in other words, a “pebble” – undergoes scattering in the forward direction, largely within a small characteristic diffraction angle θs ∼ λ/ap ∼ 100. Though mm-size dust grains contribute negligibly to the interstellar medium’s visual extinction, the signal they produce in scattered light may be detectable for vari...
متن کاملLithophagia: pebbles in and pebbles out.
Fig. 1 : X-ray abdomen of the patient showing pebbles in rectum and the anal canal 35 year old male patient hailing from Sivani, madhya Pradesh had come with complaints of passing watery stools, dull aching pain in the abdomen since 10 to 15 days. Patient had been a case of mental retardation since childhood. he was noticed passing pebbles along with passage of watery stools. On further enquiry...
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We are trying to understand exactly how complicated these orbits are. A moment’s thought reveals that the toggle operation is reversible, so the orbit of any sequence must be a cycle. A few computational experiments suggest that the length of the cycle associated with a sequence of length n is about 2 and thus has exponential length. This leads to a natural computational question that we will r...
متن کاملBrilliant displays.
November 20 07 T he next time you buy a cell phone, take a close look at the display panel. If things go the way Qualcomm hopes, that colorful little rectangle could give a whole new meaning to the expression “butterfly effect.” True, the interferometric modulator (IMOD) displays recently introduced by the San Diego– based firm have nothing to do with the unexpectedly strong effect a wing beat ...
متن کاملNested Pebbles and Transitive Closure
First-order logic with k-ary deterministic transitive closure has the same power as two-way k-head deterministic automata that use a finite set of nested pebbles. This result is valid for strings, ranked trees, and in general for families of graphs having a fixed automaton that can be used to traverse the nodes of each of the graphs in the family. Other examples of such families are grids, toru...
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ژورنال
عنوان ژورنال: Nature
سال: 1990
ISSN: 0028-0836,1476-4687
DOI: 10.1038/346021a0