منابع مشابه
On the redshift cut-off for flat-spectrum radio sources
We use data from the Parkes Half-Jansky Flat-Spectrum (PHJFS) sample (Drinkwater et al. 1997) to constrain the cosmic evolution in the co-moving space density ρ of radio sources in the top decade of the flat-spectrum radio luminosity function (RLF). A consistent picture for the high-redshift evolution is achieved using both simple parametric models, which are the first to allow for distribution...
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We use three samples (3CRR, 6CE and 6C*) selected at low radio frequency to constrain the cosmic evolution in the radio luminosity function (RLF) for the ‘most luminous’ steep-spectrum radio sources. Although intrinsically rare, such sources give the largest possible baseline in redshift for the complete flux-density-limited samples currently available. Using parametric models to describe the R...
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In the open-pit mining, one of the first decisions that must be made in production planning stage, after completing the design of final pit limits, is determining of the processing plant cut-off grade. Since this grade has an essential effect on operations, choosing the optimum cut-off grade is of considerable importance. Different goals may be used for determining optimum cut-off grade. One of...
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We prove that for every 3-edge-connected graph G there exists a partition of E(G) into at most nine sets {X1, X2, . . . , Xm} so that G \ Xi is 2-edge-connected for every 1 ≤ i ≤ m. We then generalize this result, proving that for every (2k+1)-edgeconnected graph G there is a partition of E(G) into a bounded number (depending only on k) of sets {X1, X2, . . . , Xm} so that G \ Xi is 2k-edge-con...
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ژورنال
عنوان ژورنال: Transactions of the American Mathematical Society
سال: 2009
ISSN: 0002-9947,1088-6850
DOI: 10.1090/s0002-9947-09-04916-2