05.10.2017 Мы можем комплексно решать проблемы, за которые моновуз просто не возьмётся

Что может дать судостроительной отрасли многопрофильный вуз, и зачем участникам рынка обращаться к научным исследованиям, в рамках прошедшей в Санкт-Петербурге выставки "НЕВА-2017" в интервью порталу Sudostroenie.info рассказали проректор СПбГУ по научной работе Сергей Витальевич Аплонов и директор научного парка СПбГУ Сергей Владимирович Микушев.

19.09.2017 Как создать биобанк: ученые СПбГУ делятся уникальным опытом

В Санкт-Петербургском университете состоялась первая в России школа по биобанкингу, в которой приняли участие медики и биологи со всей страны. Ученые СПбГУ поделились с коллегами опытом создания лаборатории, которая объединяет функции криохранилища и центра персонализированной медицины.

Applied Surface Science Volume 416, September 2017, Pages 988-995

A.A. Ionina, S.I. Kudryashova, A.O. Levchenko, L.V. Nguyen, I.N. Saraev, A.A. Rudenko, E.I. Ageev, D.V. Potorochin, V.P. Veiko, E.V. Borisov, D.V. Pankin, D.A. Kirilenko, P.N. Brunkov

Correlated topographic and structural modification on Si surface during multi-shot femtosecond laser exposures: Si nanopolymorphs as potential local structural nanomarkers

Applied Surface Science Volume 416, September 2017, Pages 988-995

DOI: 10.1016/j.apsusc.2017.04.215

High-pressure Si-XII and Si-III nanocrystalline polymorphs, as well as amorphous Si phase, appear consequently during multi-shot femtosecond-laser exposure of crystalline Si wafer surface above its spallation threshold along with permanently developing quasi-regular surface texture (ripples, microcones), residual hydrostatic stresses and subsurface damage, which are characterized by scanning and transmission electron microscopy, as well as by Raman micro-spectroscopy. The consequent yields of these structural Si phases indicate not only their spatially different appearance, but also potentially enable to track nanoscale, transient laser-induced high-pressure, high-temperature physical processes - local variation of ablation mechanism and rate, pressurization/pressure release, melting/resolidification, amorphization, annealing - versus cumulative laser exposure and the related development of the surface topography.

Optics and Lasers in Engineering Volume 96, September 2017, Pages 63-67

Vadim Veiko, Yulia Karlagina, Mikhail Moskvin, Vladimir Mikhailovskii, Galina Odintsova, Pavel Olshin, Dmitry Pankin, Valery Romanov, Roman Yatsuk

Metal surface coloration by oxide periodic structures formed with nanosecond laser pulses

Optics and Lasers in Engineering Volume 96, September 2017, Pages 63-67

DOI: 10.1016/j.optlaseng.2017.04.014

In this work, we studied a method of laser-induced coloration of metals, where small-scale spatially periodic structures play a key role in the process of color formation. The formation of such structures on a surface of AISI 304 stainless steel was demonstrated for the 1.06 μm fiber laser with nanosecond duration of pulses and random (elliptical) polarization. The color of the surface depends on the period, height and orientation of periodic surface structures. Adjustment of the polarization of the laser radiation or change of laser incidence angle can be used to control the orientation of the structures. The formation of markings that change their color under the different viewing angles becomes possible. The potential application of the method is metal product protection against falsification.