László E. Kollár

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10 The initiation of wet-snow shedding from overhead cables with negligible sag due to 11 natural processes was modeled experimentally and theoretically. The experiments were 12 carried out in a cold chamber where wet-snow sleeves were prepared on a suspended 13 cable, and then exposed to natural processes leading to snow shedding: air temperature 14 above(More)
Three generations of alpha,gamma-diaminobutyric acid modified poly(propyleneimine) dendrimers [DAB(AM)n, n = 4, 8, 16] containing 4, 8, 16 free amino groups were coupled with Boc-protected alpha,gamma-diaminobutyric acid (DABA) moieties in high yields. These modified dendrimers were deprotected and the chiral dendritic amines with 8, 16 and 32 amino groups(More)
In this paper, the dynamics of maps representing classes of controlled sampled systems with backlash are examined. First, a bilinear one-dimensional map is considered, and the analysis shows that, depending on the value of the control parameter, all orbits originating in an attractive set are either periodic or dense on the attractor. Moreover, the dense(More)
The pi-pi interaction-based inclusion complexation of calix[6]arene hexasulfonate as host with neutral aromatic guest molecules was studied in aqueous media. To vary the electron density on the guest's aromatic rings, the phenol parent compound was functionalized in the para-position with different electron-withdrawing groups, such as NO2 and Cl, as well as(More)
A novel 'three-level' deepened cavitand featuring a significantly sizable portal has been synthesized and its interaction with some transition metal ions has been investigated in THF/H2O binary solvent using fluorescence quenching technique. The results suggest that among the used transition metal ions including Ag(+), Cd(2+), Cu(2+), Fe(3+), Cr(3+),(More)
Sudden ice shedding from conductor bundles was modeled numerically and experimentally by improving the approaches proposed formerly for a single cable. The experimental study was carried out on a small-scale laboratory model of one span of a twin bundle. A numerical model of the experimental set-up was developed using the commercial finite element software(More)
The dynamic effects induced by ice shedding propagation on overhead transmission line cables are simulated numerically. The numerical model is validated by comparing simulation results to observations made on the fullscale test line of Hydro-Québec. The uniform ice load is simulated by several concentrated loads acting at constant distances along the loaded(More)