منابع مشابه
Sinusoid=light bar+dark bar?
A sinusoidal grating can be viewed as a series of light and dark bars. Here we measure the contrast discrimination thresholds for light and dark bars individually, and find that the contrast discrimination thresholds for the whole sinusoid can be explained as ideal summation of the light and dark bar thresholds. We propose a model for light bar, dark bar, and sinusoidal contrast discrimination ...
متن کاملOn Median Graphs and Median Grid Graphs on Median Graphs and Median Grid Graphs
Let e be an edge of a median graph G which is contained in exactly one 4-cycle. Then it is proved that G n e is a median graph. The converse holds as well provided that e is not contained is a subgraph isomorphic to the 3-cube minus a vertex. These results are used to give several characterizations of median grid graphs. (Grid graphs are subgraphs of complete grids, i.e. of the Cartesian produc...
متن کاملDetermination of the (B)over-bar -> D(*)l(nu)over-bar decay width and vertical bar V-cb vertical bar
N. E. Adam, J. P. Alexander, C. Bebek, B. E. Berger, K. Berkelman, F. Blanc, V. Boisvert, D. G. Cassel, P. S. Drell, J. E. Duboscq, K. M. Ecklund, R. Ehrlich, L. Gibbons, B. Gittelman, S. W. Gray, D. L. Hartill, B. K. Heltsley, L. Hsu, C. D. Jones, J. Kandaswamy, D. L. Kreinick, A. Magerkurth, H. Mahlke-Kruger, T. O. Meyer, N. B. Mistry, E. Nordberg, M. Palmer, J. R. Patterson, D. Peterson, J. ...
متن کاملOn median graphs and median grid graphs
Let G be a Q4-free median graph on n vertices and m edges. Let k be the number of equivalence classes of Djoković-Winkler’s relation Θ and let h be the number of Q3’s in G. Then we prove that 2n −m − k + h = 2. We also characterize median grid graphs in several different ways, for instance, they are the grid graphs with m− n + 1 squares. To obtain these results we introduce the notion of square...
متن کاملCricopharyngeal bar
A 65 year gentleman had complaints of difficulty in swallowing primarily for solids along with foreign body sensation in throat for six months duration. Patient also had to do multiple attempts at swallowing the bolus. Occasionally patient also had episodes of coughing during swallowing of liquids. Patient had no loss of weight, fever and hematemesis. Barium swallow revealed narrowing at level ...
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ژورنال
عنوان ژورنال: JAMA: The Journal of the American Medical Association
سال: 1918
ISSN: 0098-7484
DOI: 10.1001/jama.1918.02600110016005