stepped leader

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stepped leader

[′stept ′lēd·ər]
(geophysics)
The initial streamer of a lightning discharge; an intermittently advancing column of high ion density which established the channel for subsequent return streamers and dart leaders.
References in periodicals archive ?
This optimization algorithm is generalized from the mechanism of step leader propagation using the theory of fast particles known as projectiles.
The transition projectiles create the first step leader population for solutions, the space projectiles engage in exploration and attempt to become the leader, and the lead projectiles attempt to find and exploit the optimal solution [15].
If [P.sup.S.sub.i_new] new provides a good solution at step + 1 and the projectile energy [E.sup.S.sub.p_i] is greater than the step leader [E.sub.sl_i], then [p.sup.S.sub.i] is updated to [P.sup.S.sub.i_new].
Similarly, if [P.sup.L.sub.new] provides a good solution at step + 1 and the projectile energy [P.sup.L.sub.p_i] is greater than the step leader [E.sub.sl_i], then [p.sup.L] is updated to [P.sup.L.sub.new].
In the second type of forking, a channel is assumed to appear at a successful step leader tip because of the energy redistribution of the most unsuccessful leader after several propagation trials.
Elite opposition-based learning (EOBL) [48] is based on the elite step leader using OBL principle to generate elite opposition-based population to participate in competitive evolution, so as to improve population diversity of LSA.
If the elite opposition-based step leader [x'.sub.i,j] exceeds the search boundary, the processing formula is used as follows:
Define an elite step leader [X.sub.e] with the current best fitness value, and then use (12) to generate an elite opposition-based population with size n.
Challenged by a chasing pack including Team Sky's Elia Viviani, Team Katusha's Alexander Porsev and Movistar Team's Juan Jose Lobato, the 29-year-old Etixx-Quick Step leader came up with an extra push at the end to notch his first-ever stage win in Dubai to add to his one win at last week's Tour de San Luis in Argentina.
He is the lea chief but he is als thumb of the real His daughter M triplets Hubert, H his sense of adven But when his threat after the p witch to cast a spel marriage, he step leader. Producer Kathe were delighted th first time of askin She said: "Ferg with Billy in mind "We didn't kno were very pleased "He is fantast great bombas immediately buy sense of importan and his soft side "During some o we would have a li to get through in "I'd be looking a in the middle of o and (director) M tears streaming laughter.
'I held the yellow jersey in my first Tour and now, 11 years later, in what might be the last,' the Quick Step leader said.
Another step leaders could take would be to appoint physician liaisons to work with nurses and other caregivers in their respective departments.