Electronically preresonant stimulated Raman scattering microscopy in the visible

We report an experimental scheme for stimulated Raman scattering (SRS) microscopy with excitation in the visible spectral region. This allows electronically preresonant (epr) SRS microscopy of a broad range of chromophores with sensitivities as low as 1 μM. Our experiment is based on two synchronously near-infrared pumped optical parametric oscillators (OPO). One of the outputs is modulated at a fourth of the repetition rate with a novel broadband electro-optical modulator. Using a combination of spectral focusing and tuning of the OPO, we show the recording of epr-SRS spectra over the whole range of molecular vibrations at a speed up to 20 times faster than classical wavelength tuning. The imaging capabilities of this setup are demonstrated with material scientific and cellular samples

Multiphoton microscopy and ultrafast spectroscopy: Imaging meets quantum (MUSIQ) roadmap

In April 2019 the EU Marie Skłodowska-Curie Actions (MSCA) Innovative Training Networks (ITN) MUSIQ officially started. The network brought together a unique team of world-leading academics and industrial partners at the forefront of optical micro-spectroscopy and ultrafast laser technology developments merged with fundamental studies of coherent light-matter interaction phenomena, development of quantitative image analysis tools beyond state-of-the-art, and biomedical/pharmaceutical real-world applications. The unique vision of MUSIQ has been to develop and apply the next-generation optical microscopy technologies exploiting quantum coherent nonlinear phenomena. This Roadmap has been written collectively by the MUSIQ early-stage researchers and their supervisors. It provides a summary of the achievements within MUSIQ to date, with an outlook towards future directions

Finite element analysis of e-commerce cushioning in corrugated board

Corrugated board and other paper products are widely used in product packaging due to good mechanical properties, recyclability, price etc. Due to the growing e–commerce industry the dynamical behaviour of corrugated board is of particular interest. Paper exhibits an orthotropic behaviour and is a non–linear material. In this work, corrugated board is analyzed from mechanical point of view,when subjected to a short timespan impactload. Edgecrushtest (ECT),flatcrusttest(FCT),bending stiffness and static deflectiontests which are part of standards used in the industry are performed. Both experimental and numerical approaches are used in the analysis and the results are compared and discussed. The elastic part of a corrugated board material model predicts the physical behaviour well and provides reliable results. Bending stiffness model results have approximately 1% difference from physical experiments and the static deflection test together with FCT has a 6% difference. Dynamicaldroptest gives13%,11% and 27% relative error for different drop heights. Elastic–plastic behaviour requires further investigations, especially in ECT test which has around 45% discrepancy from physical experiment. The possible difference in the dynamical model might arise from the boundary conditions which were not fully controlled during the physical experiment and the difference in the ECT can be possibly explained by layer thickness approximations together with glue line width assumptions between fluting and the liners in the numerical models. Results suggest that the finite element approach is a reliable way to model corrugated board but it poses challenges especially in complex loading conditions. The elastic behaviour of the corrugated board is well predicted by assuming an orthotropical material model. The dynamic behaviour when subjected to an impulse force was well predicted for low drop heights. but requires more investigation for high impulse impacts

Finite element analysis of e-commerce cushioning in corrugated board

Corrugated board and other paper products are widely used in product packaging due to good mechanical properties, recyclability, price etc. Due to the growing e–commerce industry the dynamical behaviour of corrugated board is of particular interest. Paper exhibits an orthotropic behaviour and is a non–linear material. In this work, corrugated board is analyzed from mechanical point of view,when subjected to a short timespan impactload. Edgecrushtest (ECT),flatcrusttest(FCT),bending stiffness and static deflectiontests which are part of standards used in the industry are performed. Both experimental and numerical approaches are used in the analysis and the results are compared and discussed. The elastic part of a corrugated board material model predicts the physical behaviour well and provides reliable results. Bending stiffness model results have approximately 1% difference from physical experiments and the static deflection test together with FCT has a 6% difference. Dynamicaldroptest gives13%,11% and 27% relative error for different drop heights. Elastic–plastic behaviour requires further investigations, especially in ECT test which has around 45% discrepancy from physical experiment. The possible difference in the dynamical model might arise from the boundary conditions which were not fully controlled during the physical experiment and the difference in the ECT can be possibly explained by layer thickness approximations together with glue line width assumptions between fluting and the liners in the numerical models. Results suggest that the finite element approach is a reliable way to model corrugated board but it poses challenges especially in complex loading conditions. The elastic behaviour of the corrugated board is well predicted by assuming an orthotropical material model. The dynamic behaviour when subjected to an impulse force was well predicted for low drop heights. but requires more investigation for high impulse impacts