The property of balance (in the sense of Feder and Mihail) is investigated in the context of paving matroids. The following examples are exhibited: (a) a class of “sparse” paving matroids that are balanced, but at the same time rich enough combinatorially to permit the encoding of hard counting problems; and (b) a paving matroid that is not balanced. The computational significance of (a) is the...

The crazy-paving pattern is a linear pattern superimposed on a background of ground-glass opacity, resembling irregularly shaped paving stones. The crazy-paving pattern is initially described as the pathognomonic sign of alveolar proteinosis. Nowadays this pattern is a common finding on high-resolution CT imaging, and can be seen in a number of acute and chronic diseases. The purpose of this pa...

On June 25, 2013, President Obama announced his plan to introduce carbon dioxide emission standards for electricity generation. This paper proposes an efficiency analysis approach that addresses which emission rates (and standards) would be feasible if the existing generating units adopt best practices. A new efficiency measure is introduced and further decomposed to identify different sources’...

The article covers the results of a study adhesive and wetting (wetting edge angle) characteristics road bitumen compositions. New ingredients for have been selected to increase its ability. Based on additives such as oil sludge, gossypol resin technical sulfur, compositions with improved obtained. influence industrial sulfur structural properties has studied. chemical theory that provides adhe...

Three samples of bituminous material with different softening temperatures 321, 332, and 356.4 K were obtained by the method chemical modification tar formaldehyde using sulfuric acid as a catalyst. The determination group hydrocarbon composition was carried out for raw materials process (tar) resulting bitumens. An FTIR study groups hydrocarbons (oil, resins, asphaltenes) also out. structural ...