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

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

Surface texturing of steel by femtosecond laser and accompanying structure/ phase transformations

Topography, structure, and phase composition of surface layers of AISI 321 stainless steel textured by 1030-nm 320-fs-laser pulses were studied by scanning electron microscopy and X-ray diffraction analysis. Variation in single-pulse fluence and the number of pulses was found to change the laser-produced surface texture from onedimensional quasi-periodic nanograting to microrelief of various roughnes

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