Near-threshold femtosecond laser fabrication of one-dimensional subwavelength nanogratings on a graphite surface

Superimposed one-dimensional quasiperiodic gratings with multiple periods Λ≈110–800 nm well below or comparable to the pump laser wavelength of 744 nm, and ridge orientations perpendicular to the linear polarization of infrared femtosecond laser pulses, were fabricated after multiple near-threshold laser shots on a planar surface of quasimonocrystalline graphite in ambient airyesBelgorod State Universit

Plasma-mediated Nanosecond-Laser Generation of Si Nanoparticles in Water

Plasma-mediated nanosecond IR-laser ablation of Si in water was describe sublinear function mass loss by multi shot ablative and third-power function extinction coefficient of generated colloidal solutions of density laser intensity. The first addiction shows influence subcritical ablative plasma to ablative rate, also fast increase extinction coefficient of 100 nm size particles of silicon in colloidal solution implies plasma-mediated dissociation of the ablation products. Keywords: silicon nanoparticles, nanosecond laser ablation, sub-critical ablative plasma, extinction coefficient, scaling relationships, melt expulsio

АНАЛІТИЧНЕ ПІДГРУНТЯ ЗАБЕЗПЕЧЕННЯ ФІНАНСОВОЇ БЕЗПЕКИ СУБ’ЄКТІВ ГОСПОДАРЮВАННЯ (ANALYTICAL BASIS OF ECONOMIC AGENTS FINANCIAL SECURITY ENSURING)

У статті розглянуті питання аналітичного підґрунтя забезпечення фінансової безпеки суб’єктів господарювання на основі якісних і кількісних параметрів їх фінансового стану, які повинні сигналізувати про можливі загрози існуванню підприємства, відповідно й приймати обґрунтовані управлінські рішення попереджувального характеру. (The article discusses the analytical financial security of business entities on the basis of qualitative and quantitative parameters of their financial situation, which should signal the possible threats to the existence of the company that you can make informed management decisions preventive nature.

Femtosecond laser modification of titanium surfaces: direct imprinting of hydroxylapatite nanopowder and wettability tuning via surface microstructuring

Femtosecond laser modification of titanium surfaces was performed to produce microstructured hydrophilic and biocompatible surface layers. Biocompatible nano/microcoatings were prepared for the first time by dry femtosecond laser imprinting of hydroxylapatite nano/micropowder onto VT6 titanium surfacesyesBelgorod State Universit

Formation of quasi-periodic nano- and microstructures on silicon surface under IR and UV femtosecond laser pulses

Quasi-periodic nano- and microstructures have been formed on silicon surface using IR ( λ ≈ 744 nm) and UV ( λ ≈ 248 nm) femtosecond laser pulses. The influence of the incident laser fluence and the number of pulses on the structured surface topology has been investigatedyesBelgorod State Universit