منابع مشابه
Lithophagia: 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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Glacier retreat is a worldwide phenomenon with important consequences for the hydrological cycle and downstream ecosystem structure and functioning. To determine the effects of glacier retreat on aquatic communities, we conducted a 4-year flow manipulation in a tropical glacier-fed stream. Compared with an adjacent reference stream, meltwater flow reduction induces significant changes in benthi...
متن کاملFlipping Pebbles
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 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...
متن کاملShape and erosion of pebbles.
The shapes of flat pebbles may be characterized in terms of the statistical distribution of curvatures measured along their contours. We illustrate this method for clay pebbles eroded in a controlled laboratory apparatus, and also for naturally occurring rip-up clasts formed and eroded in the Mont St.-Michel bay. We find that the curvature distribution allows finer discrimination than tradition...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1888
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800173947