High-energy GARPUN KrF laser interaction with solid and thin-foil targets in ambient air

2004 ◽  
Author(s):  
Vladimir D. Zvorykin ◽  
Valerii G. Bakaev ◽  
Dimitri Batani ◽  
Ivan G. Lebo ◽  
A. O. Levchenko ◽  
...  
Keyword(s):  
Thin Foil ◽  
Ambient Air ◽  
High Energy ◽  
Laser Interaction ◽  
Krf Laser

Hydrodynamics of high-energy GARPUN KrF laser interaction with solid and thin-film targets in ambient air

2005 ◽  
Vol 38 (12) ◽  
pp. 2031-2044 ◽  
Author(s):  
V G Bakaev ◽  
D Batani ◽  
I A Krasnyuk ◽  
I G Lebo ◽  
A O Levchenko ◽  
...  
Keyword(s):  
Thin Film ◽  
Ambient Air ◽  
High Energy ◽  
Laser Interaction ◽  
Krf Laser

A STUDY ON THE RELATION BETWEEN MORPHOLOGICAL AND CHEMICAL CHANGES AND WETTABILITY MODIFICATION OF POLYETHERSULFONE SURFACE AFTER IRRADIATION WITH A PULSED KrF LASER

2021 ◽  
Author(s):  
HEDIEH PAZOKIAN ◽  
MOHAMMAD REZA RASHIDIAN VAZIRI
Keyword(s):  
High Energy ◽  
Threshold Region ◽  
Morphological Parameter ◽  
Biological Applications ◽  
Chemical Changes ◽  
Polymeric Surface ◽  
Krf Laser ◽  
Wetting Property ◽  
Threshold Regime

Laser irradiation is used for surface modification of polymers aiming to improve their properties for different applications. The wettability of a polymeric surface can significantly affect its performance for biological applications. In this paper, the interaction of high-energy KrF laser photons in the two above- and below-threshold regimes with polyethersulfone polymer is studied. The role of morphological and chemical changes of the irradiated polymer and their correlation in the modification of the wetting property of this polymer is investigated. The obtained results show that the morphological parameter of surface roughness is the dominant mechanism in the below-threshold regime, while in the above-threshold region, the competition between this parameter and the carbonization amount of the surface determines the final hydrophilic response.

scholarly journals Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets

2008 ◽  
Vol 26 (4) ◽  
pp. 591-596 ◽  
Author(s):  
P. McKenna ◽  
D.C. Carroll ◽  
O. Lundh ◽  
F. Nürnberg ◽  
K. Markey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Irradiation ◽  
Proton Energy ◽  
Front Surface ◽  
Picosecond Laser ◽  
Thin Foil ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Maximum Energy ◽  
Incident Laser Pulse

AbstractThe properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients, due to self-focusing of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.

A rechargeable zinc-air battery based on zinc peroxide chemistry

Science ◽  
2020 ◽  
Vol 371 (6524) ◽  
pp. 46-51
Author(s):  
Wei Sun ◽  
Fei Wang ◽  
Bao Zhang ◽  
Mengyi Zhang ◽  
Verena Küpers ◽  
...  
Keyword(s):  
Atmospheric Carbon Dioxide ◽  
Ambient Air ◽  
High Energy ◽  
Zinc Ion ◽  
High Energy Density ◽  
Air Cathode ◽  
Reversible Redox ◽  
Air Battery ◽  
Zinc Peroxide ◽  
Zinc Air Batteries

Rechargeable alkaline zinc-air batteries promise high energy density and safety but suffer from the sluggish 4 electron (e−)/oxygen (O2) chemistry that requires participation of water and from the electrochemical irreversibility originating from parasitic reactions caused by caustic electrolytes and atmospheric carbon dioxide. Here, we report a zinc-O2/zinc peroxide (ZnO2) chemistry that proceeds through a 2e−/O2 process in nonalkaline aqueous electrolytes, which enables highly reversible redox reactions in zinc-air batteries. This ZnO2 chemistry was made possible by a water-poor and zinc ion (Zn2+)–rich inner Helmholtz layer on the air cathode caused by the hydrophobic trifluoromethanesulfonate anions. The nonalkaline zinc-air battery thus constructed not only tolerates stable operations in ambient air but also exhibits substantially better reversibility than its alkaline counterpart.

scholarly journals Magnetic and Microwave Properties of Polycrystalline Gadolinium Iron Garnet

2017 ◽  
Vol 268 ◽  
pp. 287-291 ◽  
Author(s):  
Farah Nabilah Shafiee ◽  
Raba’ah Syahidah Azis ◽  
Ismayadi Ismail ◽  
Rodziah Nazlan ◽  
Idza Riati Ibrahim ◽  
...  
Keyword(s):  
Magnetic Loss ◽  
Ambient Air ◽  
High Energy ◽  
Microwave Properties ◽  
Complex Permeability ◽  
Frequency Range ◽  
Mixed Powder ◽  
Band Frequency ◽  
Suitable Material ◽  
Microwave Loss

The microwave loss in nanosized GdIG particles synthesized using mechanical alloying technique was investigated. There were very few of research on the microwave properties of nanosized particle GdIG and there is no attempt investigating on the material at C-band frequency range and its correlation with the microstructure. Gadolinium (III) iron oxide and iron (III) oxide, α-Fe2O3 were used as the starting materials. The mixed powder was then milled in a high-energy ball mixer/mill SPEX8000D for 3 hours. The samples were sintered at temperature 1200°C for 10 hours in an ambient air environment. The phase formation of the sintered samples was analyzed using a Philips X’Pert Diffractometer with Cu-Kα radiation. Complex permeability constitutes of real permeability and magnetic loss factor were measured using an Agilent HP4291A Impedance Material Analyzer in the frequency range from 10 MHz to 1 GHz. A PNA-N5227 Vector Network Analyzer (VNA) was used to obtain the information on ferromagnetic linewidth broadening, ΔH that represents the microwave loss in the samples in in frequency range of 4 to 8 GHz (C-band). The ΔH value was calculated from the transmission (S21) data acquired from VNA. The single phase GdIG showed low initial permeability and low magnetic loss when applied with low-frequency range energy. From these data, it is validated that GdIG is a suitable material for microwave devices for the high-frequency range.

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