نتایج جستجو برای: source sink
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In their famous book, Ford and Fulkerson [ 3 ] state that the situation in which there are multiple sources and sinks, with flow permitted from any source to any sink, presents nothing new. They claim that a multiple source, multiple sink network reduces to a single source, single sink network by the adjunction of a supersource, a supersink, and several arcs. That is of course true if only a ma...
[1] Although soil erosion has often been considered a net source of atmospheric carbon (C), several recent studies suggest that erosion serves as a net C sink. We have developed a spreadsheet‐based model of soil organic C dynamics within an eroding profile (Soil Organic Carbon, Erosion, Replacement, and Oxidation (SOrCERO)) that calculates effects of soil organic carbon (SOC) erosion and altere...
A k-ow-graph is a single-source/single-sink acyclic graph which is the union of k arc-disjoint source-sink paths. Arcs have unit capacity and are subject to i.i.d. random failures. It is shown that the problem of computing the probability that the operating arcs support a ow of value at least k ? 2 is #P-complete. This also shows that the \dual" problem of counting the number of subsets of arcs...
The terrestrial carbon sink has been large in recent decades, but its size and location remain uncertain. Using forest inventory data and long-term ecosystem carbon studies, we estimate a total forest sink of 2.4 ± 0.4 petagrams of carbon per year (Pg C year(-1)) globally for 1990 to 2007. We also estimate a source of 1.3 ± 0.7 Pg C year(-1) from tropical land-use change, consisting of a gross ...
Wireless Sensor Networks are made up of small sensor nodes with sensing capability. These sensor nodes have limited power supply, computational capability and storage. Due to constrained energy source in wireless sensor nodes, the design and implementation of energy efficient protocols is one of the most important challenge in Wireless Sensor Networks. Mobility of sink in wireless sensor networ...
effect of source-sink reduction on grain weight at different positions within the spike and spikelet
studies on manipulating the source-sink relationships during postanthesis in wheat have shown inconsistent results, concluding that wheat yield could be either sink- or source-limited. most studies have reported data of grain mass as an average of all grains preventing the recognition of different sensitivities to the availability of assimilates of grains placed at different positions within th...
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