Abstract We calculate the cross-section of ionization by free-electron impacts in high or moderate density plasmas. show that so-called potential depression (IPD) strongly affects magnitude high-density domain. use well-known IPD formulas Stewart–Pyatt and Ecker–Kröll. A more recent approach based on classical molecular dynamics simulation is also investigated. The latter provides an alternativ...

0

0

0

Fighting corruption is a vital aspect of good governance. When assessing government performance voters should thus withdraw electoral support from government parties that turn a blind eye to or even engage in corrupt practices. Whereas most accounts of performance-based voting focus on economic outcomes, we analyse whether and to what extent voters punish incumbents for high levels of corruptio...

a positive integer $n$ is called a clt number if every group of order $n$ satisfies the converse of lagrange's theorem. in this note, we find all clt and supersolvable numbers up to $1000$. we also formulate some questions about the distribution of these numbers.

the zarankiewicz number z(b; s) is the maximum size of a subgraph of kb,b which does not contain ks,s as a subgraph. the two-color bipartite ramsey number b(s, t) is the smallest integer b such that any coloring of the edges of kb,b with two colors contains a ks,s in the rst color or a kt,t in the second color.in this work, we design and exploit a computational method for bounding and computin...

a dominating set $d subseteq v$ of a graph $g = (v,e)$ is said to be a connected cototal dominating set if $langle d rangle$ is connected and $langle v-d rangle neq phi$, contains no isolated vertices. a connected cototal dominating set is said to be minimal if no proper subset of $d$ is connected cototal dominating set. the connected cototal domination number $gamma_{ccl}(g)$ of $g$ is the min...