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Motion of charged particles in bright squeezed vacuum

Light(Science & Applications) 2024年第2期13卷 347-353页

作者： matan even tzur Oren Cohen Solid State Institute and Physics Department Technion-Israel Institute of TechnologyHaifa3200003Israel

The motion of laser-driven electrons quivers with an average energy termed pondermotive *** explore electron dynamics driven by bright squeezed vacuum(BSV),finding that BSV induces width oscillations,akin to electron quivering in laser light,with an equivalent ponderomotive *** identify closed and open trajectories of the electronic width that are associated with high harmonic generation and above-threshold ionization,respectively,similarly to trajectories of the electron position when its motion is driven by coherent *** the case of bound electrons,the width oscillations may lead to ionization with noisy sub-cycle *** results are foundational for strong-field and free-electron quantum optics,as they shed light on ionization,high harmonic generation,and nonlinear Compton scattering in BSV.

关键词： structure vacuum ionization

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Turning in mid-air allows aphids that flee the plant to avoid reaching the risky ground

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Integrative Zoology 2017年第5期12卷 409-420页

作者： Yonatan MERESMAN matan BEN-ARI Moshe INBAR Department of Evolutionary and Environmental Biology University of HaifaHaifaIsrael Department of Zoology Faculty of Life SciencesTel-Aviv UniversityTel-AvivIsrael

When forced to drop from the plant,flightless arboreal insects can avoid reaching the risky ground by maneuvering their body through the *** wingless pea aphids(Acyrthosiphon pisum)are threatened by natural enemies,they often drop off their host plant while assuming a stereotypic posture that rotates them in mid-air,aligning them with their feet pointing *** position may increase their chances of re-clinging onto lower plant parts and avoid facing the dangers on the ground,although its effectiveness in realistic field conditions has not been *** performed both laboratory and outdoor experiments,in which we dropped aphids upon host plants to quantify clinging success in plants with different characteristics such as height and leaf *** aphids had twofold higher clinging rates than dead ones,indicating that clinging success is indeed affected by the active aerial-righting of dropping *** ability to cling was positively dependent on the plants’foliage cover as viewed in vertical direction from ***,we released aphids in commercial alfalfa(Medicago sativa)fields with varying plant heights and foliage cover and induced them to ***(up to 75%)of the aphids avoided reaching the ground in taller plants(65 cm),and 17%in shorter plants(21 cm),demonstrating the efficiency of the aphids’response in averting risks:both those of an approaching enemy on the plant and the plethora of new risks on the ***,even in complex field environment,the aerial-righting mechanism can substantially reduce the possible risks following escape from a predator.

关键词： Acyrthosiphon pisum aerial righting dropping response escape behavior predator avoidance

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