| 1. |
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| 2. |
- Rider, Sharon, et al.
(author)
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Crowding out knowledge.
- 2015
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In: Global Financial Crisis and the Restructuring of Education. - : Peter Lang Publishing Group.
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Book chapter (peer-reviewed)
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| 3. |
- James, Jeemol, et al.
(author)
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Optimizing Ti:Sapphire laser for quantitative biomedical imaging
- 2018
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In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 1049824. - : SPIE. - 1605-7422 .- 1996-756X. - 9781510614826
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Conference paper (peer-reviewed)abstract
- Ti:Sapphire lasers are powerful tools in the field of scientific research and industry for a wide range of applications such as spectroscopic studies and microscopic imaging where tunable near-infrared light is required. To push the limits of the applicability of Ti:Sapphire lasers, fundamental understanding of the construction and operation is required. This paper presents two projects, (i) dealing with the building and characterization of custom built tunable narrow linewidth Ti:Sapphire laser for fundamental spectroscopy studies; and the second project (ii) the implementation of a fs-pulsed commercial Ti:Sapphire laser in an experimental multiphoton microscopy platform. For the narrow linewidth laser, a gold-plated diffraction grating with a Littrow geometry was implemented for highresolution wavelength selection. We demonstrate that the laser is tunable between 700 to 950 nm, operating in a pulsed mode with a repetition rate of 1 kHz and maximum average output power around 350 mW. The output linewidth was reduced from 6 GHz to 1.5 GHz by inserting an additional 6 mm thick etalon. The bandwidth was measured by means of a scanning Fabry Perot interferometer. Future work will focus on using a fs-pulsed commercial Ti:Sapphire laser (Tsunami, Spectra physics), operating at 80 MHz and maximum average output power around 1 W, for implementation in an experimental multiphoton microscopy set up dedicated for biomedical applications. Special focus will be on controlling pulse duration and dispersion in the optical components and biological tissue using pulse compression. Furthermore, time correlated analysis of the biological samples will be performed with the help of time correlated single photon counting module (SPCM, Becker & Hickl) which will give a novel dimension in quantitative biomedical imaging.
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| 4. |
- Pinheiro, V. E., et al.
(author)
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Anaerobic digestion of cornmeal : the effect of crude enzyme extract and co-digestion with cow manure
- 2021
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In: Biofuels, Bioproducts and Biorefining. - : John Wiley and Sons Ltd. - 1932-104X .- 1932-1031.
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Journal article (peer-reviewed)abstract
- This study examined the effect of a crude enzyme extract, containing mainly starch-degrading enzymes, on cornmeal (Zea mays) hydrolysis. This was followed by an investigation of the effect of enzymatic treatment for the anaerobic digestion of this biomass. Cornmeal and cow manure were also co-digested, and both batch and semi-continuous experiments were performed. The enzymatic pretreatment of cornmeal resulted in a yield of 65 ± 5% reducing sugars, with 1:10 w/v (grams of dry substrate per mililiters of enzyme extract) enzyme load at 45 °C for 48 h. There was an 8% enhancement of methane production observed during the batch assays, both when cornmeal hydrolysate was digested and when enzymes were added directly to the digester. Synergetic effects were found when co-digesting cornmeal and cow manure, leading to higher methane yield (280 NmL gVS–1) than that (200 NmL gVS–1) calculated based on the methane potential of the individual substrates. Regarding long-term effects, the laboratory-scale semi-continuous experiments also demonstrated that the co-digestion of cornmeal and cow manure (1:1 volatile solid (VS) basis) led to a stable process reaching an organic loading rate of 3 g VS L day–1 and achieving a daily methane production of 1280.12 ± 99.4 NmL CH4/day. However, when cornmeal was investigated in mono-digestion, and the enzyme extract was directly added during semi-continuous digestion of cornmeal, volatile fatty acid (VFA) accumulation was observed, leading to a decrease in pH, and no significant enhancement of the conversion into methane was observed. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd
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| 5. |
- Rotermund, F., et al.
(author)
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Efficient femtosecond travelling-wave parametric amplification in periodically poled KTiOPO4
- 1999
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In: Optics Letters. - : Optical Society of America. - 0146-9592 .- 1539-4794. ; 24, s. 1874-1876
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Journal article (peer-reviewed)abstract
- We report, for the first time to our knowledge, high-power femtosecond traveling-wave optical parametric amplification by use of periodically poled KTiOPO4. With a single pass through a 4-mm-long sample of 1.23-mm thickness we achieved 40% internal conversion efficiency and 5 μJ of single-pulse idler energy near 3.8 μm, using only 75 μJ of energy from the output of a conventional 1-kHz Ti:sapphire regenerative amplifier. The 210-fs-long idler pulses were almost transform limited. We discuss the specific problems encountered in high-power parametric conversion, such as unwanted quasi-phase-matched upconversion processes for polarization configurations that utilize the largest (d33) nonlinear coefficient and the related formation of color centers (gray tracking) in KTiOPO4.
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| 6. |
- Aad, G., et al.
(author)
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- 2012
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swepub:Mat__t (peer-reviewed)
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| 7. |
- Aad, G., et al.
(author)
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- 2014
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Journal article (peer-reviewed)
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| 8. |
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| 9. |
- Kao-Walter, Sharon, et al.
(author)
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Tearing and Delaminating of a Polymer Laminate
- 2011
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In: Key Engineering Materials. - : @scientific.net. - 1013-9826. ; 465, s. 169-174
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Journal article (peer-reviewed)abstract
- The fracture behaviour of laminated materials was studied in this work. The materials used in this work were low-density polyethylene (LDPE) laminated on polyethylene (PET). The thickness of the LDPE was 27 μm and the PET was 100 μm. Experiments were performed by using a 2-leg trousers specimen to analyse the tearing behaviour of the laminate in relation to the delamination. A clear delamination zone was observed during the crack propagation by tearing. Furthermore, a finite element calculation was performed to simulate the behavior around the crack tip during the tearing. A correlation between adhesion and crack propagation was discussed. Finally, the theory of Essential Work of Fracture (EWF) was used for predicting the specific total work of fracture along the tear path across the plastic zones.
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| 10. |
- Keevallik, Leelo
(author)
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Turn organization and bodily-vocal demonstrations
- 2014
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In: Journal of Pragmatics. - : Elsevier. - 0378-2166 .- 1879-1387. ; 65, s. 103-120
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Journal article (peer-reviewed)abstract
- The study focuses on turns in interaction that involve a bodily-vocal demonstration: an embodied demonstration that is accompanied by a non-lexical vocalization. It shows how the temporal organization of these demonstrations contributes to participant treatment of them as a part of a turn-constructional unit, mostly as its completion. It is also suggested that a bodily-vocal demonstration may function as a separate turn-constructional unit, with a transition relevance point before it, and other participants refraining from action before its completion. Vocalizations, occasionally with coherent pitch contours of intonation units, are argued to render bodily displays vocal space within turns-at-talk. After a bodily-vocal demonstration, the turn-constructional unit can be recompleted with verbal devices, displaying further similarity to verbal-only turns. The analysis calls into attention the relevance of embodied behavior to the emergence of units in conversation.
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