Since its first edition in 1988,The Arkansas Freedom of Information Acthas become the standard reference for the bench, the bar, and journalists for guidance in interpreting and applying the state's ...open-government law. This sixth edition, published fifty years after the passage of the Act in 1967, builds upon its predecessors, incorporating later legislative enactments, judicial decisions, and Attorney General's opinions to present a synthesis of the law of access to public records and meetings in Arkansas.
Across the board Watkins, John J; Watkins, John J
2004., 20110919, 2011, 2004, 2004-01-01
eBook
Across the Board is the definitive work on chessboard problems. It is not simply about chess but the chessboard itself--that simple grid of squares so common to games around the world. And, more ...importantly, the fascinating mathematics behind it. From the Knight's Tour Problem and Queens Domination to their many variations, John Watkins surveys all the well-known problems in this surprisingly fertile area of recreational mathematics. Can a knight follow a path that covers every square once, ending on the starting square? How many queens are needed so that every square is targeted or occupied by one of the queens?
The resistive-pulse method was used to monitor the pressure-driven translocation of multilamellar liposomes with radii between 190 and 450 nm through a single conical nanopore embedded in a glass ...membrane. Liposomes (0% and 5% 1,2-dioleoyl-sn-glycero-3-phospho-l-serine (sodium salt) in 1,2-dilauroyl-sn-glycero-3-phosphocholine or 0%, 5%, and 9% 1,2-dipalmitoyl-sn-glycero-3-phospho(1'-rac-glycerol) (sodium salt) in 1,2-dipalmitoyl-sn-glycero-3-phosphocholine) were prepared by extrusion through a polycarbonate membrane. Liposome translocation through a glass nanopore was studied as a function of nanopore size and the temperature relative to the lipid bilayer transition temperature, T(c). All translocation events through pores larger than the liposome, regardless of temperature, show translocation times between 30 and 300 μs and current pulse heights between 0.2% and 15% from the open pore baseline. However, liposomes at temperatures below the T(c) were captured at the pore orifice when translocation was attempted through pores of smaller dimensions, but squeezed through the same pores when the temperature was raised above T(c). The results provide insights into the deformation and translocation of individual liposomes through a porous material.
Latin squares form the basis for the recreational puzzles sudoku and KenKen. In this article we show how useful several ideas from number theory are in solving a KenKen puzzle. For example, the ...simple notion of triangular number is surprisingly effective. We also introduce a variation of KenKen that uses the Gaussian integers in order to illustrate the concept of unique factorization.
The kinetics of ion pairing of
IrCl
6
3
-
with K
+, Ca
2+ and tetraethylammonium (TEA
+) were investigated by steady-state voltammetry at disk and hemispherically shaped Pt electrodes. A general ...square-scheme mechanism is employed that allows for redox reactions of both free and ion paired
IrCl
6
3
-
and
IrCl
6
2
-
. Numerical simulations of the voltammetric response employing the ion pairing square scheme suggest that the dissociation rate constant of the reactant ion pair can be determined from the voltammetric wave shape recorded at very small electrodes. No ion-pair kinetic limitation was discernable in K
+ and Ca
2+ solutions using Pt hemispherical electrodes with radii as small as 13 nm, indicating that ion-pair dissociation in these solutions occurs at rates greater than 10
7 s
−1. However, the voltammetric wave in 1 M TEA
+ displays a shoulder at electrodes with radii less than 500 nm, consistent with a slower rate of ion-pair dissociation. The appearance of the shoulder is predicted by the numerical simulations and corresponds to a direct observation of the oxidation of both free and ion paired
IrCl
6
3
-
in the same solution.
