| 1. |
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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Hagström, A. L., et al.
(författare)
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An iterative approach to determine the refractive index of 3D printed 60GHz PLA lenses
- 2018
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Ingår i: Proceedings of the 14th Loughborough Antennas and Propagation Conference (LAPC 2018). - Piscataway, N.J. : IEEE. - 9781785619694
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Konferensbidrag (refereegranskat)abstract
- This paper describes an iterative approach to determine quasi-optical properties of standard 3D printer filament material to, in an inexpensive and fast way, construct focusing lenses for millimetre wave systems. Results from three lenses with different focal lengths are shown and discussed. The real part of the permittivity at 60GHz for polylactic acid (PLA) is in this paper determined to be εr=2.74. © 2018 Institution of Engineering and Technology. All rights reserved.
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| 3. |
- Hambäck, Peter A., et al.
(författare)
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Tradeoffs and synergies in wetland multifunctionality : A scaling issue
- 2023
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Ingår i: Science of the Total Environment. - Amsterdam : Elsevier BV. - 0048-9697 .- 1879-1026. ; 862
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Forskningsöversikt (refereegranskat)abstract
- Wetland area in agricultural landscapes has been heavily reduced to gain land for crop production, but in recent years there is increased societal recognition of the negative consequences from wetland loss on nutrient retention, biodiversity and a range of other benefits to humans. The current trend is therefore to re-establish wetlands, often with an aim to achieve the simultaneous delivery of multiple ecosystem services, i.e., multifunctionality. Here we review the literature on key objectives used to motivate wetland re-establishment in temperate agricultural landscapes (provision of flow regulation, nutrient retention, climate mitigation, biodiversity conservation and cultural ecosystem services), and their relationships to environmental properties, in order to identify potential for tradeoffs and synergies concerning the development of multifunctional wetlands. Through this process, we find that there is a need for a change in scale from a focus on single wetlands to wetlandscapes (multiple neighboring wetlands including their catchments and surrounding landscape features) if multiple societal and environmental goals are to be achieved. Finally, we discuss the key factors to be considered when planning for re-establishment of wetlands that can support achievement of a wide range of objectives at the landscape scale.
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| 4. |
- Kristiansson, P., et al.
(författare)
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Optical dot gain on newsprint determined with the Lund nuclear microprobe
- 1997
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - Amsterdam : Elsevier. - 0168-583X .- 1872-9584. ; 130:1-4, s. 303-307
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Tidskriftsartikel (refereegranskat)abstract
- A technique for measuring optical dot gain, i.e. the relative difference between the actual screen dot and the optically perceived one, is presented. By combining measurements from the non-optical nuclear microprobe with data from image analyzing technique the optical dot gain can be determined. The procedure to reach pixel by pixel correlation on a micrometer scale is discussed. In the newsprint sample studied in this investigation a typical optical dot gain between 15 and 20% was deduced. The variation in the optical dot gain was correlated with other characteristic parameters of the print and newsprint and especially a positive correlation to the mass density of the newsprint was observed. (C) 1997 Elsevier Science Ltd.
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| 5. |
- Carlsson, J., et al.
(författare)
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Application of optical fluorescence spectroscopy to paper production
- 1999
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Ingår i: TAPPI INTERNATIONAL PAPER PHYSICS CONFERENCE. - Atlanta : Tappi Press. - 0898529549 ; , s. 429-436
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Konferensbidrag (refereegranskat)abstract
- Fluorescence light emitted from paper following the absorption of either ultraviolet or visible light has a wavelength distribution determined by the chemical composition of the paper. This can be used both for laboratory measurements of paper characteristics and for on-line monitoring of the paper during production. Such measurements can be performed non-intrusively at sampling rates high enough to give a sub-millimetre resolution in the machine direction in a paper machine or rerewinder. In this project two types of fluorescence monitors have been constructed. They are operating at different wavelengths and thereby they monitor different substances in the paper. The monitors have been tested at newsprint producing paper mills together with an optical speedometer. The measurements in the production environment have shown that the equipment is capable of indirectly monitoring paper quality parameters which affect the local abundance of lignin. Examples of such parameters are the number of shives in the paper and wire marks. A fluorescence based method for scanning cross-directional newsprint profiles in the laboratory has been developed. From these measurements the relative shrinkage of the paper during drying can be calculated using time-frequency analysis.
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| 6. |
- Jakovljevic, M., et al.
(författare)
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VDSL Power Back-Off Parameter Optimization for a Cable Bundle
- 2007
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Ingår i: Proceedings European Signal Processing Conference. - Poznan : Poznań University of Technology. - 9788392134022 - 9788392134046 ; , s. 550-554
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Konferensbidrag (refereegranskat)abstract
- To better utilize the capacity of the twisted-pair access networks, operators deploying very high-speed digital subscriber line (VDSL) systems need accurate parameters for power back-off (PBO). However, VDSL standards give almost no guidance on how these parameters should be established for a particular network. In this paper we present a new technique for optimizing PBO parameters for a cable bundle, which is based on the Nelder-Mead simplex search algorithm. In this way each operator can easily calculate PBO parameters that match its actual access network down to the individual cable bundle. Using the properties of the PBO, as defined in the VDSL standard, we show how a normalized FEXT coupling can replace the knowledge of the individual couplings during the optimization of the PBO parameters. By simulations based on measured cable data we show that our approach using cable bundle unique PBO (CUPBO) achieves a significant improvements compared to the performance achieved with the ordinary PBO. © 2007 EURASIP.
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| 7. |
- Liang, B., et al.
(författare)
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The autoantibody response to cyclic citrullinated collagen type II peptides in rheumatoid arthritis
- 2019
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Ingår i: Rheumatology. - Oxford : NLM (Medline). - 1462-0324 .- 1462-0332. ; 58:9, s. 1623-1633
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVES: The detection of anti-citrullinated peptide antibodies (ACPAs) is a serological hallmark of RA. Autoantibodies reactive with collagen type II (CII) are present in RA sera and synovial fluid and are potentially pathogenic. Here, we investigate the prevalence and specificity of the autoantibody responses to defined citrullinated cyclic peptides derived from CII in a China RA cohort. METHODS: Using bead-based multiplex assay, we examined the presence of autoantibodies binding to 54 cyclic 17-mer citrullinated CII peptides, encompassing all citrullinate epitopes in CII, and the corresponding unmodified peptides in 415 RA patients, in addition to 304 patients with OA. Furthermore, the autoantibody responses to a selected set of 10 cyclic citrullinated peptides were also examined in 203 healthy individuals. RESULTS: Autoantibody responses to cyclic citrullinated CII peptides were higher in RA patients as compared with OA patients or healthy individuals, whereas little or negligible antibody responses to cyclic unmodified CII peptides were observed. Interestingly, several novel citrullinated CII epitopes were identified. Antibodies to these novel citrullinated CII epitopes showed not only substantial overlapping reactivities but also had unique specificities. CONCLUSION: We found a high prevalence of autoantibodies against cyclic citrullinated CII in the sera of patients in a China RA cohort. The present study revealed heterogeneous binding patterns against novel citrullinated CII epitopes, which may help to stratify RA patients into different subgroups.
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| 8. |
- Nilsson, C M, et al.
(författare)
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Red fluorescence sensor for noncontact on-line measurements in paper production
- 2001
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Ingår i: Optical Engineering. - : SPIE-Intl Soc Optical Eng. - 0091-3286 .- 1560-2303. ; 40:8, s. 1674-1681
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Tidskriftsartikel (refereegranskat)abstract
- A robust sensor is developed for on-line measurements in paper production. The sensor is designed for optimal response to lignin in paper. A diode laser operating at 630 nm is used for excitation and fluorescence light in the wavelength region 660 to 740 nm is detected. A compact photomultiplier tube is used for fast detection with a high SNR. The measuring spot is 90 mum in diameter. All optical and electronics components are housed in a small 250X140X90 mm(3) box. Because the system can make up to 1.2 million measurements/s the distance between adjacent measuring points can be as short as about 20 mum, even at a paper speed of 25 m/s, as is common with a modern newsprint paper machine. The recording system can store data continuously for 45 min at this sampling rate and data from three more sensors can be recorded simultaneously with the same resolution. This high-capacity sensor system can monitor the behavior of a paper machine at much higher time and space resolution than has traditionally been possible. From test runs on four different newsprint paper machines we observed the existence of small spots of high fluorescence in the paper from one machine, characteristic behavior with a significantly lower level of fluorescence in periodical sections of about 200 m in another machine, and that wire marks and periodical patterns could be very well identified from the fluorescence recordings. Such data have proven to contain important information for the papermaker concerning, for example the relative shrinkage of the paper web in the drying section of the paper machine. © 2001 Society of Photo-Optical Instrumentation Engineers.
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| 9. |
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| 10. |
- Nilsson Tengelin, M., et al.
(författare)
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A Novel Method for Studying Threshold Levels for Positive Phototaxis in Insects
- 2021
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Ingår i: CIE x048. - Vienna : CIE Central Bureau. - 9783902842299 ; , s. 262-268
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- This paper presents a novel method for studying threshold levels for positive phototaxis ofinsects and smaller mobile organisms. Outdoor lighting affects light sensitive species and thereis a need to evaluate the effect of light levels, spectral composition of the light and lightdistribution to mitigate the ecological impacts of the artificial light. For this purpose, a test boxinvestigating the effect of light on insects in a controlled manner has been constructed. The boxis equipped with a luminance source and the light levels can be varied from a maximum valuecontinuously down to zero. The spectral composition of the light can be varied by changing thelamp or using optical filters. For visibility of the insects the box has infrared light emitting diodesin the ceiling and two wide-angle cameras monitor the light response. The functionality of thebox is tested with the species greater wax moth.
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