| 1. |
- Nilsson, R. Henrik, 1976, et al.
(author)
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Mycobiome diversity: high-throughput sequencing and identification of fungi.
- 2019
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In: Nature reviews. Microbiology. - : Springer Science and Business Media LLC. - 1740-1534 .- 1740-1526. ; 17, s. 95-109
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Research review (peer-reviewed)abstract
- Fungi are major ecological players in both terrestrial and aquatic environments by cycling organic matter and channelling nutrients across trophic levels. High-throughput sequencing (HTS) studies of fungal communities are redrawing the map of the fungal kingdom by hinting at its enormous - and largely uncharted - taxonomic and functional diversity. However, HTS approaches come with a range of pitfalls and potential biases, cautioning against unwary application and interpretation of HTS technologies and results. In this Review, we provide an overview and practical recommendations for aspects of HTS studies ranging from sampling and laboratory practices to data processing and analysis. We also discuss upcoming trends and techniques in the field and summarize recent and noteworthy results from HTS studies targeting fungal communities and guilds. Our Review highlights the need for reproducibility and public data availability in the study of fungal communities. If the associated challenges and conceptual barriers are overcome, HTS offers immense possibilities in mycology and elsewhere.
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| 2. |
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Sprickor i fasaden
- 2018
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Editorial collection (other academic/artistic)abstract
- Det råder på sina håll en oro och ett mörker i dagens Sverige. Några grupper ser en värld av kollapsande system och spruckna fasader, där folkvalda fattar beslut som utarmar människors trygghet och livsvillkor. Andra ser hur antide-mokratiska krafter, likt början av förra seklet, växer sig allt större och på sina håll ges legitimitet av världsledare. Somliga går så långt som att tala om en demokrati i kris, om obönhörligt växande sprickbildningar i samhällsbygget i spåren av vilka otrygghetens och rädslans landskap breder ut sig. Sprickor i fasaden knyter an till denna rådande debatt och föreställningar om samhällets tillstånd.Världen som vi en gång kände den tycks långsamt glida ur våra händer. Den välputsade fasaden spricker. Eller gör den det? Kanske skiftar samhällets palett i långt fler nyanser än mörkaste grått? Kanske spirar det rent av en värld med allt godare möjligheter för människor att leva och utvecklas? För i kontrast till bilden av samhällets rämnande grundvalar, kan också skymtas skiftningar i värdegrunden i riktning mot ökad tolerans, öppenhet och jämlikhet. Måhända är dessa skiftningar tecken på sprickor också i föreställningen om den spruck-na fasaden? Sprickor i fasaden är den 72:e forskarantologin från SOM-institutet och bygger på 2017 års nationella SOM-undersökning – den trettioandra i ordningen. Bokens innehåll knyter på många sätt an till frågan om sprickor i det svenska samhällsbygget. Flera kapitel belyser tilltagande polarisering och politisering inom (S)amhälle, (O)pinion och (M)edier. Samtidigt pekar resultaten i andra kapitel på en påtaglig stabilitet och förstärkt uppslutning kring centrala värde-ringar, samhällsfrågor och samhällsinstitutioner.Sprickor i fasaden är skriven av ett 30-tal forskare från olika discipliner vid universitet och högskolor i Sverige.
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| 3. |
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| 4. |
- Grabowski, Alexander, 1993
(author)
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VCSEL Equivalent Circuits and Silicon Photonics Integration
- 2022
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Doctoral thesis (other academic/artistic)abstract
- The vertical-cavity surface-emitting laser (VCSEL) is a light source of great importance for numerous industrial and consumer products. The main application areas are datacom and sensing. The datacom industry uses GaAs-based VCSELs for optical interconnects, the short-reach fiber optical communication links used to transfer large amounts of data at high rates between units within data centers and supercomputers. In the area of sensing, VCSELs are largely used in consumer products such as smart phones (e.g. face ID and camera auto focus), computer mice, and automobiles (e.g. gesture recognition and LIDAR for autonomous driving). In this work, an advanced physics-based equivalent circuit model for datacom VCSELs has been developed. The model lends itself to co-design and co-optimization with driver and receiver ICs, thereby enabling higher data rate transceivers with bandwidth limited VCSELs and photodiodes. The model also facilitates an understanding of how each physical process within the VCSEL affects the VCSEL static and dynamic performance. It has been applied to study the impact of carrier transport and capture on VCSEL dynamics. The work also includes micro-transfer-printing of GaAs-based single-mode VCSELs on silicon nitride photonic integrated circuits (PICs). Such PICs are increasingly used for e.g. compact and highly functional bio-photonic sensors. Transfer printing of VCSELs enables the much-needed on-PIC integration of power efficient light sources. The bottom-emitting VCSELs are printed above grating couplers on the PIC and optical feedback is used to control the polarization for efficient coupling to the silicon nitride waveguide. Wavelength tuning, as required by the bio-sensing application, is achieved by direct current modulation.
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| 5. |
- Sattari, Amir, 1980-, et al.
(author)
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INDUSTRIAL NANOPARTICLES HEALTH RISKS AND ADVANTAGES OF A DECENT INDUSTRIAL VENTILATION SYSTEM IN REDUCING THE RELATED RISKS
- 2012
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In: INDUSTRIAL NANOPARTICLES HEALTH RISKS AND ADVANTAGES OF A DECENT INDUSTRIAL VENTILATION SYSTEM IN REDUCING THE RELATED RISKS. ; , s. -6
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Conference paper (peer-reviewed)abstract
- With the fast-growing use of nanoparticles (NPs) in a wide range of production and manufacturing processes, and great health and environmental risks associated to NPs, it is important to treat the industry-produced NPs in a proper way. Ventilation of industrial workplaces lies within the concept of sustainability challenges for the development of nanoproducts. Due to the decreased grain size of material to nano limits and thus the appearance of either new or changed properties, health risk of workers in such environments is critical concerning the complicated and unknown characteristics of nanoparticles. There is great evidence over the past few years that ultrafine particles and especially NPs in the breathing air are strong toxins. Different mitigation measures for air-borne nanoparticles in industrial workplaces are substitution, engineering controls such as ventilation and provision of personal protective equipment. In this paper selection criteria for ventilation systems and different ventilation methods (hood ventilation and global enclosure/room ventilation systems) as engineering controls of nanoparticles within industrial enclosures will be reviewed. Novel methods for improvement of ventilation efficiency in general and industrial work places with an eye on ventilation of nanoparticles will be presented.
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| 6. |
- Rebolledo Salgado, Israel, 1992, et al.
(author)
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Active Feedback Stabilization of Super-efficient Microcombs
- 2023
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In: 2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC). - : Institute of Electrical and Electronics Engineers (IEEE). - 2833-1052. - 9798350345995
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Conference paper (peer-reviewed)abstract
- We report the long-term operation of a super-efficient microcomb. We use the soliton power to maintain a fixed pump detuning. The microcomb operates over 25 hours using a thermal control in a packaged module.
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| 7. |
- Fu, Qilin, et al.
(author)
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Anti-vibration Engineering in Internal Turning Using a Carbon Nanocomposite Damping Coating Produced by PECVD Process
- 2014
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In: Journal of materials engineering and performance (Print). - : Springer-Verlag New York. - 1059-9495 .- 1544-1024. ; 23:2, s. 506-517
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Journal article (peer-reviewed)abstract
- Machining dynamic stability has been enhanced through a damping coating based on a novel carbon-based nanocomposite material. The coating was synthesized using a plasma enhanced chemical vapor deposition method, and deposited on to the round-shank boring bar used for internal turning and tested during machining. Comparisons between an uncoated and a coated boring bar were carried out at 0.25 mm and 0.5 mm depth of cut using a five times length to diameter ratio overhang, which are typical conditions known to generate detrimental mechanical vibrations. From sound pressure measurement it was found that the measured absolute sound level during process could be reduced by about 90% when using the tool coated with damping layer. Surface roughness measurements of the processed workpiece showed decreased Ra values from approximately 3-6 mu m to less than 2 mu m (and in 50% of the cases < 1 mu m) when comparing an uncoated standard tool with its coated counterpart. Moreover, it was found that the addition of an anti-vibration coating did not adversely affect other tool properties, such as rigidity and modularity.
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| 8. |
- Sieber, Arne Santa, et al.
(author)
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Compact recreational rebreather with innovative gas sensing concept and low work of breathing design
- 2013
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In: Marine Technology Society journal. - : Marine Technology Society Inc.. - 0025-3324 .- 1948-1209. ; 47:6, s. 27-41
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Journal article (peer-reviewed)abstract
- Recreational rebreathers are increasingly popular, and recreational diver training organizations now routinely offer training for rebreather diving. Few rebreathers on the market, however, fulfill the criteria of a dedicated recreational rebreather. These remain based on traditional sensor technology, which may be linked to rebreather use having an estimated 10 times the risk of mortality while diving compared with open circuit breathing systems. In the present work, a new recreational rebreather based on two innovative approaches is described. Firstly, the rebreather uses a novel sensor system including voltammetric and spectroscopic validation of galvanic pO2 sensor cells, a redundant optical pO2 sensor, and a two-wavelength infrared pCO2 sensor. Secondly, a new breathing loop design is introduced, which reduces failure points, improves work of breathing, and can be mass fabricated at a comparatively low cost. Two prototypes were assembled and tested in the laboratory at a notified body for personal protective equipment before both pool and sea water diving trials. Work of breathing was well below the maximum allowed by the European Normative. These trials also demonstrated that optical pO2 sensors can be successfully employed in rebreathers. The pCO2 sensor detected pCO2 from 0.0004 to 0.0024 bar. These new approaches, which include a new concept for simplified mechanical design as well as improved electronic control, may prove useful in future recreational diving apparatus.
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| 9. |
- Koptyug, Andrey, 1956-, et al.
(author)
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Electron Beam Melting: from Shape Freedom to Materials Properties Control at Macro- and Microscale
- 2021
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In: Proceedings of the THERMEC 2020, Graz, Austria. - : Trans Tech Publications. ; , s. 755-759
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Conference paper (peer-reviewed)abstract
- Electron beam melting (EBM) is one of the constantly developing powder bed fusion (PBF) additive manufacturing technologies (AM) offering advanced control over the manufacturing process. Freedom of component shapes is one of the AM competitive advantages already used at industrial and semi- industrial scale. Development of the additive manufacturing today is targeting both widening of the available materials classes, and introducing new enabling modalities. Present research is related to the new possibilities in tailoring different material properties within additively manufactured components effectively adding “fourth dimension to the 3D-printing”. Specific examples are given in relation to the electron beam melting, but majority of the conclusions are valid for the laser-based PBF techniques as well. Through manipulating beam energy deposition it is possible to tailor quite different material properties selectively within each manufactured component, including effective material density as well as thermal, mechanical, electrical and acoustic properties. It is also possible to acquire by choice both metal-metal composite and completely alloyed material, when blends of precursor powder are used together with the beam energy manipulation.
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| 10. |
- Kaline P., Furlan
(author)
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Photonic materials for high-temperature applications: Synthesis and characterization by X-ray ptychographic tomography
- 2018
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In: Applied Materials Today. - : Elsevier BV. - 2352-9407. ; 13, s. 359-369
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Journal article (peer-reviewed)abstract
- Photonic materials for high-temperature applications need to withstand temperatures usually higher than 1000 °C, whilst keeping their function. When exposed to high temperatures, such nanostructured materials are prone to detrimental morphological changes, however the structure evolution pathway of photonic materials and its correlation with the loss of material's function is not yet fully understood. Here we use high-resolution ptychographic X-ray computed tomography (PXCT) and scanning electron microscopy (SEM) to investigate the structural changes in mullite inverse opal photonic crystals produced by a very-low-temperature (95 °C) atomic layer deposition (ALD) super-cycle process. The 3D structural changes caused by the high-temperature exposure were quantified and associated with the distinct structural features of the ceramic photonic crystals. Other than observed in photonic crystals produced via powder colloidal suspensions or sol-gel infiltration, at high temperatures of 1400 °C we detected a mass transport direction from the nano pores to the shells. We relate these different structure evolution pathways to the presence of hollow vertexes in our ALD-based inverse opal photonic crystals. Although the periodically ordered structure is distorted after sintering, the mullite inverse opal photonic crystal presents a photonic stopgap even after heat treatment at 1400 °C for 100 h.
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