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  • 51.
    Hägglund, Håkan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Local optical variations in paper: measurements and analysis2012Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
  • 52.
    Hägglund, Håkan
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Norberg, Ole
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Neuman, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Edström, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Dependence between paper properties and spectral optical response of uncoated paper2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 2, s. 440-444Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This paper presents a method to describe, with good accuracy, the relation between variations in paper properties and variations of the spectral optical response of an uncoated paper. The dependence between density, filler content, grammage, and the spectral optical response is characterized by a multivariate model. The model is based on large-scale measurements data on a set of paper samples that have been produced with different values of grammage, density and filler content, representing the variations within a normal 80 g/m2 uncoated paper. From the optical measurements the light scattering (s) and light absorption (k) coefficients have been estimated according to the Kubelka-Munk theory.The results from this study will give valuable input to optical modeling activities, where the optical variations are predicted from measured small-scale variations in underlying paper properties.The variations in the paper properties can be used to model the light scattering coefficient, s, but there were too small variations in the light absorption coefficient, k, to find any significant dependence to the paper properties for the samples studied in this work. Furthermore, linear models give sufficient accuracy in the intervals studied. Additional findings from this study are the different effects of wet-pressing and calendering on the light scattering coefficient. 

  • 53.
    Hägglund, Rickard
    et al.
    SCA R&D Centre, Sundsvall, Sweden.
    Åslund, Pär
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Carlsson, Leif A.
    Florida Atlantic University, Department of Engineering Physics.
    Isaksson, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Measuring thickness changes of edge-wise compression loaded corrugated board panels using digital image correlation2012Ingår i: Journal of Sandwich Structures and Materials, ISSN 1099-6362, E-ISSN 1530-7972, Vol. 14, nr 1, s. 75-94Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study examines thickness changes in web-core sandwich panels under edgewise compressive loading. Both undamaged and damaged panels were examined. Three-dimensional full-field digital image correlation systems were used to determine deflections on both sides of loaded panels. The change in thickness at any given point in the panel was obtained as the difference between the two displacement fields. It was observed that the thickness was reduced in the post-buckling regime. Damage introduced into the corrugated core by lateral compression proved to significantly reduce the load-carrying capability panels and elevate the thickness reduction of the panels.

  • 54.
    Högberg, Ida
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Zasadowski, Dariusz
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Karlsson, Anette
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Wikman, Bengt
    SCA Rand D Centre, Box 716, SE-851 21 Sundsvall, Sweden.
    Andersson, Fredrik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hedenström, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Edlund, Håkan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Norgren, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Brightness development of a hydrogen peroxide bleached spruce TMP. Comparisons of pre-treatments with DTPA and a separable chelating surfactant2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 1, s. 50-55Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this investigation a new type of recoverable complexing agent (chelating surfactant) has been compared with a conventional complexing agent; diethylenetriamine pentaacetic acid (DTPA), in the metal ion sequestering of thermomechanical pulps (TMP) to be hydrogen peroxide bleached. After different degrees of washing of the pulps, bleaching experiments at different total alkali charges were performed with and without sodium silicate additions, and the ISO brightness of hand-made sheets was measured. The residual hydrogen peroxide in the bleaching liquor was also determined. No significant difference in either the brightness development or the residual hydrogen peroxide content could be detected between the pulps treated with equivalent molar ratios of the different complexing agents. Furthermore, the recovery of the chelating surfactant-manganese complexes from laboratory made white water by froth flotation was also studied. Two different foaming agents; sodium dodecyl sulphonate (SDS) and dimethyldodecylamine oxide (DDAO), were tested in the froth generation. After an addition of 160 ppm of DDAO, more than 80% of the manganese chelates could be recovered in the foam, containing 3% of the initial water mass.

  • 55.
    Ibrahem, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Afewerki, Samson
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Breistein, Palle
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap, teknik och matematik.
    Córdova, Armando
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    One-pot three-component catalytic asymmetric synthesis of homoallylboronates2012Ingår i: ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY. Vol 243, American Chemical Society (ACS), 2012, s. 889-INOR-Konferensbidrag (Refereegranskat)
    Abstract [en]

    1. A novel one-pot three-component catalytic enantioselective reaction between bis(pinacolato)diboron, enals and 2-(triphenylphosphoranylidene)acetate esters employing inexpensive bench stable Cu salts and simple chiral amine as co-catalysts is presented. The reaction proceeds via a tandem catalytic asymmetric conjugate borane addition/Wittig sequence where the b-boration step is 1,4-selective and gives the corresponding homoallylboronate products with high enantiomeric ratios (up to 97.5:2.5 er).

    2. The direct intermolecular regiospecific and highly enantioselective a-allylic alkylation of linear aldehydes by combination of achiral bench stable Pd(0) complexes and simple chiral amines as co-catalysts is disclosed. The co-catalytic asymmetric chemoselective and regiospecific a-allylic alkylation reaction is linked in tandem with in situ reduction to give the corresponding 2-alkyl alcohols with high enantiomeric ratios (up to 98:2 er). It is also an expeditious entry to valuable 2-alkyl substituted hemiacetals and 2-alkyl-butane-1,4-diols.

  • 56.
    Ibrahem, Ismail
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Breistein, Palle
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Córdova, Armando
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    One-pot three-component highly selective synthesis of homoallylboronates by using metal-free catalysis2012Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 18, nr 17, s. 5175-5179Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Metal-free selectivity: The first metal-free one-pot three-component highly chemo- and regioselective catalytic synthesis of homoallylboranes using simple N-heterocyclic carbenes (NHC) and amines is presented. The catalytic reaction between B 2(pin) 2, α,β-unsaturated aldehydes and 2-(triphenylphosphoranylidene)acetate esters proceeds through a catalytic metal-free β-boration/Wittig cascade sequence (see scheme). © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  • 57.
    Ivarsson, Björn
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Kutzschebauch, F.
    Institute of Mathematics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
    On the number of factors in the unipotent factorization of holomorphic mappings into SL2(C)2012Ingår i: Proceedings of the American Mathematical Society, ISSN 0002-9939, E-ISSN 1088-6826, Vol. 140, nr 3, s. 823-838Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    We estimate the number of unipotent elements needed to factor a null-homotopic holomorphic map from a finite dimensional reduced Stein space X into SL2 (C).

  • 58.
    Ivarsson, Björn
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Kutzschebauch, Frank
    Universität Bern.
    Holomorphic factorization of mappings into SL_n(C)2012Ingår i: Annals of Mathematics, ISSN 0003-486X, E-ISSN 1939-8980, Vol. 175, nr 1, s. 45-69Artikel i tidskrift (Refereegranskat)
  • 59.
    Jaradeh, Majed M.
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Carlberg, Torbjörn
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Analysis of Distribution of Nonmetallic Inclusions in Aluminum DC-Cast Billets and Slabs2012Ingår i: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 43, nr 1, s. 82-91Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    Inclusion distribution was studied in commercial aluminum DC-cast billets and slabs using a newly developed deep-etching method. Analyses revealed a nonuniform distribution of nonmetallic inclusions across billet diameters and lengths, and also across slab thicknesses and widths. In as-cast billets, more inclusions were found at the beginning and end of the billet length; more were present near the cross-section center than near the surface. In slabs, inclusions were located mostly within 13 mm of the surface and in a band between the centerline and the surface. Few inclusions were found 60 to 100 mm from the slab surface or at the centerline. In addition, comparing slab quality after casting using three types of ceramic foam filters (CFFs; i.e., 30 ppi, 50 ppi, and 50 ppi + HF) revealed significant differences in inclusion size, number, and distribution. Casting slabs using a finer pore-size filter (50 ppi) reduced the number of non-metallic inclusions greatly. The inclusion distribution patterns observed in the solidified slabs are discussed in terms of melt flow during casting.

  • 60.
    Johansson, Niklas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Andersson, Mattias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Angular variations of reflectance and fluorescence from paper - the influence of fluorescent whitening agents and fillers2012Ingår i: Final Program and Proceedings - IS and T/SID Color Imaging Conference, Springfield, USA: The Society for Imaging Science and Technology, 2012, s. 236-241Konferensbidrag (Refereegranskat)
    Abstract [en]

    It has earlier been shown that light reflected from the bodyof paper exhibit anisotropic behavior. On the other hand, fluores-cence emission is often assumed to be distributed in a Lambertianmanner. The angular behavior of light reflected and fluorescedfrom paper is examined using measurements from a spectral go-niophotometer. The angular dependency of the radiance factorswas measured for a range of excitation wavelengths. Moreover,the influence of fillers and fluorescent whitening agents (FWA)on the anisotropy was studied. The measurements show that theanisotropy of the total radiance factor of paper decreases whenan increasing amount of FWA is added to the paper. The sameeffect was also observed when an increased amount of filler wasadded to the paper. In addition, it was shown that the presenceof fillers reduce the effect of the FWA. The results show that incomparison to the anisotropy of the total radiance factor from thepaper samples, the anisotropy of the fluorescence alone is negligi-ble. Hence, for paper samples containing FWA evenly distributedin the bulk, the fluorescence alone should not induce significantdifferences between color measuring instruments of different mea-surement geometries.

  • 61.
    Karlsson, Anette
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Enberg, Sofia
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Rundlöf, Mats
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Paulsson, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Edström, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Determining optical properties of mechanical pulps: Sheetmaking procedure and investigation of different ways to evaluate light absorption2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 3, s. 531-541Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A method to produce representative sheets for determination of optical properties of mechanical pulps has been developed. It reduces the risk of contamination and discoloration and can be used with small pulp quantities. The deviation from the expected linear behaviour of the light scattering coefficient, s, at wavelengths corresponding to strong light absorption, has been studied using the Kubelka-Munk model and the angular resolved DORT2002 radiative transfer solution method. This decrease in s could not be explained by errors introduced in the Kubelka-Munk modelling by anisotropic scattering. Linear extrapolation of s can therefore not be justified as a way to obtain a more correct light absorption coefficient, k. For thepulps studied, the decrease in s at short wavelengths had little effect on k at 457 nm.

  • 62.
    Kulachenko, Artem
    et al.
    Royal Inst Technol, Dept Solid Mech, S-10044 Stockholm, Sweden.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Direct simulations of fiber network deformation and failure2012Ingår i: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 51, s. 1-14Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A finite element model for 3D random fiber networks was constructed to simulate deformation and failure behavior of networks with dynamic bonding/debonding properties. Such fiber networks are ubiquitous among many living systems, soft matters, bio-materials, and engineering materials (papers and non-woven). A key feature of this new network model is the fiber-fiber interaction model that is based on AFM measurements from our earlier study. A series of simulations have been performed to investigate strain localization behavior, strength statistics, in particular, the variations of strength, strain-to-failure and elastic modulus, and their size dependence. Other variables investigated are fiber geometries. The result showed that, in spite of its disordered structure, strength and elastic modulus of a fiber network varied very little statistically, as long as the average number of fibers in the simulated specimen and the degree of fiber orientation are kept constant. However, strain-to-failure showed very significant statistical variations, and thus more sensitivity to the disordered structures. (C) 2012 Elsevier Ltd. All rights reserved.

  • 63.
    Laurén, Ari
    et al.
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Lappalainen, Mari
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Saari, Paivi
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Kukkonen, Jussi V. K.
    Department of Biology, University of Eastern Finland, P.O. Box 111, Joensuu 80101, Finland.
    Koivusalo, Harri
    Department of Civil and Environmental Engineering, Aalto University School of Engineering, P.O. Box 15200, Aalto 00076, Finland.
    Piirainen, Sirpa
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Setälä, Heikki
    Department of Environmental Sciences, University of Helsinki, Niemenkatu 73, Lahti 15140, Finland.
    Sarjala, Tytti
    Parkano Unit, Finnish Forest Research Institute, Kaironiementie 15, Parkano 39700, Finland.
    Bylund, Dan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Heinonen, Jaakko
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Nieminen, Mika
    Vantaa Unit, Finnish Forest Research Institute, P.O. Box 18, Vantaa 01301, Finland.
    Palviainen, Marjo
    Department of Forest Sciences, University of Helsinki, P.O. Box 27, Helsinki 00014, Finland.
    Launiainen, Samuli
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Finér, Leena
    Joensuu Unit, Finnish Forest Research Institute, P.O. Box 68, Joensuu 80101, Finland.
    Nitrogen and Carbon Dynamics and the Role of Enchytraeid Worms in Decomposition of L, F and H Layers of Boreal Mor2012Ingår i: Water, Air and Soil Pollution, ISSN 0049-6979, E-ISSN 1573-2932, Vol. 223, nr 7, s. 3701-3719Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Decomposition of organic material releases carbon dioxide (CO2) into the atmosphere, and dissolved organic carbon (DOC), dissolved organic nitrogen (DON) and ammonium (NH4-N) into soil water. Each of the decomposition products contributes differently to overall export of carbon (C) and nitrogen (N) to water courses. Our aim was to study the quantity and composition of the released C and N as affected by the organic material and soil fauna, represented by enchytraeid worms. We measured the release rate of carbon dioxide, and calculated the release rates for DOC and dissolved N in soil from repeated measurements of DOC and N pools during laboratory incubation of litter (L), fermented (F) and humus (H) layers of boreal forest mor. The intermediate decomposition products, DOC and DON, were characterised according to the molecule size. The release rate of the decomposition products was higher for fresh than for old organic material. The majority of N and C were released as NH4-N and CO2, respectively. The amount of extractable organic N in soil decreased by time but DON increased. Enchytraeids stimulated N mineralisation and the release of large molecule size DOC, particularly in L layer. The results suggest that organic N in extractable form biodegrades effectively, and that soil fauna have an important role in the decomposition. The results were interpreted from the water quality point of view and the implications of the results to modelling of decomposition and export of DOC and dissolved N to recipient water bodies are discussed. In the modelling context, the novelty of the study is the description of the intermediate decomposition products and the division of the dissolved organic compounds into low molecular weight and high molecular weight fractions.

  • 64.
    Lindqvist, Markus
    et al.
    Department of Laboratory Medicine, Sundsvall County Hospital Sweden.
    Hellström, Anders
    Department of Laboratory Medicine, Sundsvall County Hospital Sweden.
    Henriksson, Anders E.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design. Department of Laboratory Medicine, Sundsvall County Hospital Sweden.
    Abdominal aortic aneurysm and the association with serum levels of Homocysteine, vitamins B6, B12 and Folate.2012Ingår i: American Journal of Cardiovascular Disease, ISSN 2160-200X, Vol. 2, nr 4, s. 318-22Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Previous investigations have shown hyperhomocysteinemi in patients with abdominal aortic aneurysm (AAA). In the present study we evaluated the circulating level of homocysteine (Hcy) in relation to renal function, vitamins B6, B12 and folate status in AAA patients with special regard to aneurysm size, and rupture. Hcy, Creatinine, B6, B12 and folate were measured in 119 patients with AAA and 36 controls without aneurysm matched by age, gender and smoking habit. As expected there was a weak correlation between Hcy and vitamins B6, B12 or folate. We found similar levels of Hcy, B6 and folic acid in patients with nonruptured AAA compared to the control group matched by age, gender and smoking habit. There was no correlation between maximum diameter of the nonruptured AAA (n=78) and Hcy, B6 or folate. However, the present study shows a significant inverse correlation between maximum diameter of the nonruptured AAA (n=78) and B12 (r = -0.304, p=0.007) with significant higher levels in small AAA compared to large AAA. In conclusion, Hcy does not seem to be a useful biomarker in AAA disease. The unexpected finding of B12 levels correlating to aneurysm diameter warrants urgent further investigation of B12 supplement to prevent progression of small AAA.

  • 65.
    Lindqvist, Markus
    et al.
    Department of Clinical Chemistry, Sundsvall County Hospital, Sweden.
    Wallinder, Jonas
    Department of Surgery, Sundsvall County Hospital, Sweden .
    Bergström, Jörgen
    Proteomics Core Facility, University of Gothenburg, Sweden .
    Henriksson, Anders E.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design. Department of Clinical Chemistry, Sundsvall County Hospital, Sweden .
    Plasma glycosylphosphatidylinositol phospholipase D (GPI-PLD) and abdominal aortic aneurysm.2012Ingår i: International Journal of Clinical and Experimental Medicine, ISSN 1940-5901, E-ISSN 1940-5901, Vol. 5, nr 4, s. 306-9Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Recent reviews state that a circulating biomarker predicting aortic rupture risk would be a powerful tool to stratify patients with small screen-detected abdominal aortic aneurysm (AAA). In a current proteomic pilot-study elevated levels of the enzyme Glycosylphosphatidylinositol-specific phospholipase D (GPI-PLD) was shown in patients with small AAA compared with controls without aneurysm. In the present study we investigated the impact of plasma GPI-PLD as a biomarker in patients with AAA in relation to aneurysm size, and rupture. Plasma GPI-PLD was measured in patients with AAA (nonruptured, n=78 and ruptured, n=55) and controls without aneurysm (n=41) matched by age, sex and smoking habit. The plasma GPI-PLD levels were significantly lower in patients with ruptured compared nonruptured AAA which we interpreted as a result of hemodilution due to hemorrhage in patients with ruptured AAA. The plasma GPI-PLD levels were similar in patients with nonruptured AAA compared to the controls without aneurysm. Furthermore, there was no correlation between plasma GPI-PLD and aneurysm size in the group of patients with nonruptured AAA. In conclusion, the present study fails to show a connection between GPI-PLD and AAA. However, the definite role of GPI-PLD as a predictive marker needs to be further clarified in a follow-up cohort study.

  • 66.
    Lindqvist, Markus
    et al.
    Sundsvall Cty Hosp, Dept Clin Chem, SE-85186 Sundsvall, Sweden.
    Wallinder, Jonas
    Department of Surgery, Sundsvall County Hospital, Sweden.
    Henriksson, Anders E.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Soluble urokinase plasminogen activator receptor in patients with abdominal aortic aneurysm2012Ingår i: Thrombosis Research, ISSN 0049-3848, E-ISSN 1879-2472, Vol. 130, nr 3, s. 511-513Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Introduction: In the present study we investigated the impact of soluble urokinase plasminogen activator receptor (suPAR) as a biomarker in patients with abdominal aortic aneurysm (AAA) in relation to conventional inflammatory markers, aneurysm size, and rupture. Methods: suPAR and conventional inflammatory markers were measured in 119 patients with AAA and 36 controls without aneurysm matched by age, gender and smoking habit. Results: The results support earlier studies suggesting a state of activated inflammatory response in patients with nonruptured AAA as expressed by elevated CRP and IL-6 compared with the controls. In contrast, suPAR showed similar levels in patients with nonruptured AAA compared with the controls. Unexpectedly, all follow-up patients (n = 16) have significant (p<0.001) elevated suPAR levels three years postoperatively compared preoperatively. Conclusions: suPAR does not seem to be a useful biomarker in the AAA disease. The role of the postoperative elevation of suPAR needs to be further elucidated. (C) 2012 Elsevier Ltd. All rights reserved.

  • 67.
    Lusth, Helen
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Gradin, Per A
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hellström, Lisbeth M
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    The dependency of energy consumption on cutting angles in the canter chipping process2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 5, s. 886-889Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Canter chippers are used in sawmills to reduce the circular cross section of logs to a rectangular shape before sawing. The canter chipper is a conical disc equipped with knives on its periphery. When rotated at high velocity it transforms the outer parts of a log into sawdust and chips. It is important to be able to predict the energy consumption during canting since it is useful to know whether a particular canting strategy can be employed in situations where there is a limit on the power supply. A theoretical model in which energy consumption can be calculated is necessary for such a prediction. Data concerning the specific cutting energy is needed to develop the model for the canting operation. In this paper the energy consumption during chipping of spruce is determined by using a pilot wood chipper at two different cutting rates and for several cutting angles. The results indicate that the specific energy to cut wood chips increases as the angle between the fibre direction and the cutting plane increases.

  • 68.
    Lönnell, Niklas
    et al.
    Plant Ecology, Department of Botany, Stockholm University, Stockholm, Sweden.
    Hylander, Kristoffer
    Plant Ecology, Department of Botany, Stockholm University, Stockholm, Sweden.
    Jonsson, Bengt Gunnar
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Sundberg, Sebastian
    Swedish Species Information Centre, Swedish University of Agricultural Sciences, Uppsala, Sweden.
    The Fate of the Missing Spores - Patterns of Realized Dispersal beyond the Closest Vicinity of a Sporulating Moss2012Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, nr 7, s. e41987-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    It is well-known that many species with small diaspores can disperse far during extended temporal scales (many years). However, studies on short temporal scales usually only cover short distances (in, e.g., bryophytes up to 15 m). By using a novel experimental design, studying the realized dispersal, we extend this range by almost two orders of magnitude. We recorded establishment of the fast-growing moss Discelium nudum on introduced suitable substrates, placed around a translocated, sporulating mother colony. Around 2,000 pots with acidic clay were placed at different distances between 5 m and 600 m, in four directions, on a raised bog, with increased pot numbers with distance. The experiment was set up in April-May and the realized dispersal (number of colonized pots) was recorded in September. Close to the mother colony (up to 10 m), the mean colonization rates (ratio of colonized pots) exceeded 50%. At distances between 10 and 50 m colonization dropped sharply, but beyond 50 m the mean colonization rates stabilized and hardly changed (1-3%). The estimated density of spores causing establishments at the further distances (2-6 spores/m(2)) was realistic when compared to the estimated spore output from the central colonies. Our study supports calculations from earlier studies, limited to short distances, that a majority of the spores disperse beyond the nearest vicinity of a source. The even colonization pattern at further distances raises interesting questions about under what conditions spores are transported and deposited. However, it is clear that regular establishment is likely at the km-scale for this and many other species with similar spore output and dispersal mechanism.

  • 69.
    Ma, Guangning
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Lin, Shuangzheng
    Stockholm Univ, Dept Organ Chem, Arrhenius Lab, S-10691 Stockholm, Sweden .
    Ibrahem, Ismail
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Kubik, Grzegorz
    Stockholm Univ, Dept Organ Chem, Arrhenius Lab, S-10691 Stockholm, Sweden .
    Liu, Leifeng
    Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, S-10691 Stockholm, Sweden.
    Sun, Junliang
    Stockholm Univ, Dept Mat & Environm Chem, Arrhenius Lab, S-10691 Stockholm, Sweden.
    Cordova, Armando
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Achiral Co-Catalyst Induced Switches in Catalytic Asymmetric Reactions on Racemic Mixtures (RRM): From Stereodivergent RRM to Stereoconvergent Deracemization by Combination of Hydrogen Bond Donating and Chiral Amine Catalysts2012Ingår i: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 354, nr 14-15, s. 2865-2872Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A stereochemical divergent approach for the highly enantioselective synthesis of distinct bicyclic products with multiple stereocenters from a racemate using a single chiral catalyst is disclosed. It is based on switches of the overall reaction pathways in the chiral amine-catalyzed cascade reactions between racemic ?-nitro ketones and a,beta-unsaturated aldehydes using different achiral co-catalysts. The utility of the method is exemplified by the highly diasteroselective switch and stereoconvergent deracemization process by combination of chiral amine and achiral hydrogen-bond-donating catalysts.

  • 70.
    Neubauer, Björn
    et al.
    Sensible Solutions Sweden AB, Sweden.
    Sidén, Johan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Gulliksson, Mikael
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Olofsson, Christopher
    Sensible Solutions Sweden AB, Sweden.
    Koptyug, Andrey
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för teknik och hållbar utveckling.
    Nilsson, Hans-Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Norgren, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    A new thermally activated battery cell-based forest fire detection and monitoring system2012Ingår i: WIT Transactions on Ecology and the Environment, Southampton: WIT Press, 2012, s. 113-124Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Detection of forest wildfires at early stages can significantly improve the success of fire fighting and thus it contributes to the damage and cost reduction. Surface deployed sensor networks linked to global nets are often regarded as technically simple options to achieve forest fire detection and progress monitoring. Straightforward solutions with sensor nodes continuously supplying telemetric information demand heavy duty power supplies and periodic service. They are relatively expensive and commonly not environmentally friendly. We have suggested and currently develop an early warning forest fire detection system based on inexpensive, dormant fire-activated detecting sensors and a number of monitoring nodes in a network configuration. Small deploy-and-forget type sensors contain a radio transmitter with recorded identity number, together with an inactive power element. When activated by high temperature of a developing wildfire, this element produces enough power to support the transmitter, broadcasting the unique identity code until the sensor is completely burnt. Monitoring nodes of such system stand by for sensor activation and forward the alarm information along the monitoring nodes network. Implementation of anti-collision transmission protocols in the sensors allows the monitoring nodes to keep track of fire development and progress. Monitoring nodes and nodes linking the forest fire detection and monitoring net to public networks can be made using conventional technology and utilizing existing communication networks. Thus significant efforts have been directed to the design of the primary sensors, designing them to be cost efficient and minimizing their environmental impact. Cellulose-based materials are widely used in the sensor construction to decrease its environmental impact and cost. The core of the sensor power element is made of laminated and screen-printed cellulose- based substrates. The power element is activated by a small amount of water, trapped in crystal hydrate salts in storage and released by elevated temperatures of the fire. These salt-based sensors can be manufactured in a rollto- roll manner, making them cost effective. Absence of any liquids or gels in the sensor construction will guarantee a good shelf time. © 2012 WIT Press.

  • 71.
    Neuman, Magnus
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Gustafsson Coppel, Ludovic
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Edström, Per
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    A partial explanation of the dependence between light scattering and light absorption in the Kubelka-Munk model2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 2, s. 426-430Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The Kubelka-Munk scattering and absorption coefficients of a set of paper samples are assessed using reflectance measurements in d/0 geometry. The coefficients display the widely studied dependence between light scattering and light absorption, since the light scattering coefficient decreases in regions of high absorption. It is shown using general radiative transfer theory that part of this dependence can be explained and eliminated by taking into account the geometry of the d/0 instrument and the single scattering anisotropy, thus capturing the angular variations of the light reflected from the samples. These findings allow the papermaker to better predict the reflectance from mixtures of pulps, fillers, dye, and FWA, and to better evaluate bleaching efforts. 

  • 72.
    Nieberding, Caroline M
    et al.
    Evolutionary Biology Group, Institute of Biology, Leiden University, 2300 RA Leiden, Netherlands.
    Fischer, Klaus
    Zoological Institute and Museum, Greifswald University, Johann-Sebastian-Bach Str. 11/12, 17489 Greifswald, Germany.
    Saastamoinen, Marjo
    Metapopulation Research Group, Department of BioSciences, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014, Finland.
    Allen, Cerisse E
    Division of Biological Sciences, University of Montana, Missoula MT 59812, United States.
    Wallin, Erika A.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hedenström, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Brakefield, Paul M
    University Museum of Zoology Cambridge, Downing Street, Cambridge, CB2 3EJ, United Kingdom.
    Cracking the olfactory code of a butterfly: the scent of ageing.2012Ingår i: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 15, nr 5, s. 415-424Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Ecology Letters (2012) 15: 415-424 ABSTRACT: Although olfaction is a primary mode of communication, its importance in sexual selection remains understudied. Here, using the butterfly Bicyclus anynana, we address all the parameters of importance to sexual selection for a male olfactory signal. We show that variation in the male sex pheromone composition indicates male identity and male age. Courting males of different ages display small absolute (c. 200 ng) but large relative (100%) change of one specific pheromone component (hexadecanal) which, unlike the other components, showed no heritability. Females prefer to mate with mid-aged over younger males and the pheromone composition is sufficient to determine this preference. Surprisingly refined information is thus present in the male olfactory signal and is used for sexual selection. Our data also reveal that there may be no 'lek paradox' to resolve once the precise signal of importance to females is identified, as hexadecanal is, as expected, depleted in additive genetic variation.

  • 73.
    Niga, Petru
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Örtegren, Jonas
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Alecrim, Viviane
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Klaman, Marianne
    Innventia AB, Stockholm, Sweden.
    Blohm, Erik
    Innventia AB, Stockholm, Sweden.
    Lofthus, Jon
    Innventia AB, Stockholm, Sweden.
    Hybrid printing: paper media for combined flexographic and inkjet printing2012Ingår i: Conference proceedings International Paper Physics Conference, Stockholm: Innventia , 2012, s. 79-81Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    Hybrid printing combining inkjet technology with flexography can be used to add customer specific information into the production of packaging and print. However, in order to improve print quality, a comprehensive understanding of the mechanisms governing print quality is required. In this work, inkjet printing using three aqueous inkjet inks was performed on top of flexographic printouts on four paper substrates. For comparative reasons, inkjet printouts were made on the four papers as well. The flexographic film contained tone values ranging from 0 to 100% ink coverage. Line width and print density of the inkjet printouts were evaluated. It was found that paper characteristics such as surface energy, porosity, absorption coefficient and surface roughness play an important role in defining the final print quality. These findings are further supported by micrograph images.

  • 74.
    Nilson, Tomas
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Schiebold, Cornelia
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    On the noncommutative two-dimensional Toda latticeManuskript (preprint) (Övrigt vetenskapligt)
  • 75.
    Niskanen, Kaarlo
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Mechanics of paper products2012Samlingsverk (redaktörskap) (Övrigt vetenskapligt)
    Abstract [en]

    This graduate level textbook focuses on the mechanical properties and performance of products made of fiber-based materials such as paper and board. The book aims to help students develop effective skills for solving problems of product performance and engineering challenges in new product development. Therefore the material is organized with a problem-based approach - a practical example of product performance is presented and then the relevant mechanics are analyzed to deduce which material properties control the performance.

  • 76.
    Norgren, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Höga värden finns i det termomekaniska massabrukets processvatten. Men vem tar hem vinsten?2012Ingår i: Nordisk papper & massa, ISSN 1651-2995, nr 2, s. 41-41Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
  • 77.
    Norgren, Magnus
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Andersson, Kerstin
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Eriksson, Marie
    SCA R&D Centre, Sundsvall, Sweden.
    Lignin Removal by Adsorption to Fly Ash in Wastewater Generated by Mechanical Pulping2012Ingår i: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 51, nr 8, s. 3444-3451Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Stringent discharge requirements call for advanced methods of wastewater treatment to take on where biological treatment fails to succeed. Here, the adsorption potential of fly ash, an on-site available and cheap material, was tested in batch and continuous flow fixed bed experiments using bleaching effluent from an integrated mill producing mechanical pulp. Various models were fitted to the experimental data to find the best description of the adsorption system and to obtain important model parameters: the Freundlich model yielded the highest correlation and indicated that the process was favorable. The bed depth service time model suggested that the adsorption in the column setup involved more than one rate limiting step, and the Thomas and Clark models generated similar curves which satisfactorily described adsorption at short bed depth. The fly ash showed good adsorptive properties of wood derived substances: both lignin and extractives were effectively separated from the effluent.

  • 78.
    Norgren, Magnus
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Notley, Shannon M
    Department of Applied Mathematics, ANU, Australia.
    Study of thin films of kraft lignin and two DHPs by means of single-molecule force spectroscopy (SMFS)2012Ingår i: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 66, nr 5, s. 615-622Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The adhesion of single and associated lignin chains to a substrate has been studied by means of single-molecule force spectroscopy (SMFS). Softwood kraft lignin (KL) and two lignin polymer models (dehydrogenation polymers, DHPs) based on coniferyl alcohol (DHPc.alc.)and coniferaldehyde (DHPc.ald.) were in focus. The desorption force from the "silicon nitride SMFS tip" for the KL was significantly greater than that of the DHPs. The higher desorption force was interpreted as being due to the interaction of carboxyl groups through hydrogen bonding with the tip as well as to the less compact polymeric layer at the interface. The distribution of the extended chain lengths was determined, and self-association of lignin chains was observed. For both KL and the DHPc.ald., chains were extended significantly beyond the limit that would be expected for polymers with the corresponding degree of polymerization. The alpha-carbon on the DHPc.alc. has a strong intramolecular hydrogen bonding interaction with the adjacent aryl ether, which inhibits the possibility of the ether to participate in intermolecular hydrogen bonding with nearby lignin chains. Thus, the self-association for KL and DHPc.ald. was found to be dominated by intermolecular hydrogen bonding with carboxylic groups and aryl ether functionalities.

  • 79.
    Norström, Sara H
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Bylund, Dan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Vestin, Jenny L. K.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Lundström, Ulla S
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Initial effects of wood ash application to soil and soil solution chemistry in a small, boreal watershed2012Ingår i: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 187, s. 85-93Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    With the conception that whole tree harvesting leads to an impoverishment of forest soils wood ash application is recommended, with the foremost benefits being increased pH in soil and subsequent surface waters, and recycling of nutrients from the wood ash.

    In this investigation a small boreal catchment in central Sweden was studied for two years before and two years after treatment with the maximum recommended dose, 3 tonnes/ha, of crushed, self-hardened wood ash. The sampling area was situated in a slope towards a stream, to include the effect on both recharge- and discharge areas with different soil constitutions. The soil solution chemistry, exchangeable pool of cations and potential heavy metal accumulation in berries were studied. Temporary increases in soil solution concentration were found for K in the recharge area and Ca and SO4 in the discharge area when comparing ashed and control areas. No change in exchangeable cations was observed during the study period, and no increase of heavy metals in bilberries did occur. These small changes in the constitution of the soil solution do not suggest wood ash application as a method to improve soil quality in an initial phase.

  • 80.
    Olsen, Martin
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    The mechanics in two nanosized systems: Size effect and threshold field2012Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [sv]

    I denna avhandling undersöker vi mekaniken i två system av nanostorlek. I Artikel I finner vi en effect av den lilla storleken hos en bladfjäder av nanometerstorlek vilken påverkar dess egensvängningsfrekvens. I Artilel II finner vi ett tröskelvärde hos det pålagda elektriska fältet för att det genom diffusion ska bildas en nanometerstor kulle på substratet under spetsen i ett sveptunnelmikroskop.

    Artikel I: Genom att använda en endimensionell fri elektronmodell där vi bortser från atomstrukturen i metallen och vanlig balkteori beräknar vi fjäderkonstanten hos en vibrerande nanotråd inspänd i ena änden. Vi använder de asymptotiska egenvärdena hos de stående elektronvågorna med vilkas hjälp vi beräknar den storkanoniska (dvs med variabelt elektronantal) potentialen hos elektrongasen. Från denna potential beräknar vi kraften som måste användas för att böja tråden och därmed fjäderkonstanten. När nanotråden böjs ökar dess tvärsnittyta enligt den vanliga balkteorin och fler elektrontillstånd passar i ytan. Detta påverkar ”fjäderkonstanten” vilken oscillerar något med hur mycket tråden är böjd. På detta sätt erhåller vi en amplitudberoende egensvängningsfrekvens hos tråden som borde vara mätbar.

    Artikel II: Genom att lägga på en spänningspuls mellan spetsen på ett sveptunnelmikroskop och substratet under den kan man modifiera substratets yta. I denna artikel har vi tittat närmare på elektrisk fältinducerad ytdiffusion samt också van der Waals inducerad diffusion. Dessa två mekanismer kan skapa en liten kulle på substratet under mikroskopspetsen. Dipolmomentet för en ytadsorberad atom, adatom, på substratets yta är summan av det ytinducerade dipolmomentet (som är oberoende av pålaggd spänning) och det elektriskt inducerade dipolmomentet som beror på styrkan och polariteten hos det pålaggda elektriska fältet. Det elektriska fältet är analytiskt modellerat som fältet av en punktladdning över en oändlig platt elektriskt ledande yta (substratet). Från detta beräknar vi kraften som leder till att adatomerna börjar vandra. Den beräknade kraften är liten, typiskt av storleken pN, men tack vare att adatomerna hoppar omring på substratet på grund av den termiska rörelsen hos kristallen de sitter på kan även en liten nettokraft leda till en drift av adatomer på ytan. På detta sätt erhåller vi en ny formel för en polaritetsberoende tröskelspänning för bildning av en kulle under mikroskopspetsen för positiv spets. Vi erhåller även en formel för radien på kullen. Ur modellen kan vi beräkna ett tröskelfält på 2 V/nm för att en kulle ska bildas. Om fältet är svagare bildas ingen kulle. Vi finner vidare att van der Waalskraften mellan en adatom och spetsen måste tas med i beräkningen för spets-substratavstånd mindre än 1.5 nm.

  • 81.
    Olsen, Martin
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hummelgård, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Olin, Håkan
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Surface modifications by field induced diffusion2012Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 7, nr 1, s. Art. no. e30106-Artikel i tidskrift (Refereegranskat)
    Abstract [sv]

    Genom att lägga på en spänningspuls mellan spetsen på ett sveptunnelmikroskop och substratet under den kan man modifiera substratets ytan. I denna artikel har vi tittat närmare på elektrisk fältinducerad ytdiffusion samt också van der Waals inducerad diffusion. Dessa två mekanismer kan skapa en liten kulle på substratet under mikroskopspetsen. Dipolmomentet för en ytadsorberad atom, adatom, på substratets yta är summan av det ytinducerade dipolmomentet (vilket är oberoende av pålaggd spänning) och det elektriskt inducerade dipolmomentet vilket beror på styrkan och polariteten hos det pålaggda elekriska fältet. Det elektriska fältet är analytiskt modellerat som fältet av en punktladdning över en oändlig platt elektriskt ledande yta (substratet). Från detta beräknar vi kraften vilken leder till att adatomerna börjar vandra. Den beräknade kraften är liten, typiskt av storleken pN, men tack vare att adatomerna hoppar omring på substratet på grund av den termiska rörelsen hos kristallen de sitter på kan även en liten nettokraft leda till en drift av adatomer på ytan. På detta sätt erhåller vi en ny formel för en polaritetsberoende tröskelspänning för bildning av en kulle under mikroskopspetsen för positiv spets. Vi erhåller även en formel för radien på kullen. Ur modellen kan vi beräkna ett tröskelfält på 2 V/nm för att en kulle ska bildas. Om fältet är svagare bildas ingen kulle. Vi finner vidare att van der Waalskraften mellan en adatom och spetsen måste tas med i beräkningen för spets-substratavstånd mindre än 1.5 nm för experimentellt vanligen använda spänningar.

  • 82.
    Olsson, Jörgen
    et al.
    SLU, Dept Wildlife Fish & Environm Studies, SE-90183 Umea, Sweden .
    Johansson, Therese
    SLU, Dept Wildlife Fish & Environm Studies, SE-90183 Umea, Sweden .
    Jonsson, Bengt Gunnar
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hjältén, Joakim
    SLU, Dept Wildlife Fish & Environm Studies, SE-90183 Umea, Sweden .
    Edman, Mattias
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Ericson, Lars
    Umea Univ, Dept Ecol & Environm Sci, SE-90187 Umea, Sweden .
    Landscape and substrate properties affect species richness and community composition of saproxylic beetles2012Ingår i: Forest Ecology and Management, ISSN 0378-1127, E-ISSN 1872-7042, Vol. 286, s. 108-120Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Intensive forest management has dramatically reduced the area of old-growth forest in Fennoscandia. We examined if the proportion of old forest in a landscape affects species composition, richness and abundance of saproxylic beetles. We used tube-shaped window traps in five pairs of sites, selected so that the sites within each pair differed with respect to the proportion of old forest (>125 years) in the surrounding landscape. A landscape level inventory of the wood fungi Fomitopsis rosea, as a proxy for forest with high conservation values, was used to complement the data on old forests. In addition, to testing whether mycelia-colonised wood may attract saproxylic beetles, the tube-shaped window traps were baited with wood colonised by Fomitopsis pinicola or F. rosea. Old-forest-rich landscapes supported significantly more species and a higher abundance of saproxylic beetles than old-forest-poor landscapes. The analysis revealed a clear connection between the community composition of saproxylic beetles and the proportion of old forest and number of F. rosea fruiting bodies in the surrounding landscape (radius 3 km). The local landscape species pool thus appears to be important for the beetle species that are trapped since the composition of saproxylic beetles differed between the two landscape types. The effects of the different baits were less pronounced than the effect of landscape type, although species-specific responses to the two mycelia baits were observed. This indicates that volatiles from mycelia of wood-decaying fungi and the mycelial community may affect colonisation patterns of saproxylic beetles. Our results suggest that forest fragmentation and habitat loss have resulted in depauperate beetle faunas in old-forest-poor landscapes. Our results highlight the need to invoke a landscape scale approach for preserving biodiversity, in this case the need to maintain a sufficient proportion of forest with old growth characteristics in the managed landscape. (C) 2012 Elsevier B.V. All rights reserved.

  • 83.
    Paulsson, Magnus
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Parkås, Jim
    Sodra Innovat, Sodra Cell Varo, SE-43024 Varobacka, Sweden.
    Review: Light-Induced Yellowing Of Lignocellulosic Pulps - Mechanisms And Preventive Methods2012Ingår i: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 7, nr 4, s. 5995-6040Artikel, forskningsöversikt (Refereegranskat)
    Abstract [en]

    This review will focus on recent progress regarding the mechanisms of light-induced discoloration of mechanical and chemimechanical pulps and on the proposed preventive treatments. It is evident that the mechanisms behind photoyellowing of lignin-rich pulps are complex and that several types of reaction pathways may coexist. Photoyellowing proceeds via one initial fast phase and a slower following phase. The fast phase has been ascribed to oxidation of free phenolic groups and/or hydroquinones and catechols to photoproducts of mainly quinonoid character. A multitude of reactions involving several lignin subunits are possible. Important intermediates are phenoxyl radicals, and to some extent ketyl radicals. The importance of the phenacyl aryl ether pathway might be more important than previously thought, even though the original content of such groups is low in lignin. Even though many preventive methods against photoyellowing have been suggested, no cost-efficient treatment is available to hinder photoreversion of lignin-containing paper permanently. Suggested methods for stabilization include chemical modification (etherification and esterification), coating the paper product, addition of radical scavengers, excited state quenchers, or ultraviolet absorbing compounds.

  • 84.
    Porten, Egmont
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    The Hartogs phenomenon on weakly pseudoconcave hypersurfaces2012Ingår i: Mathematische Annalen, ISSN 0025-5831, E-ISSN 1432-1807, Vol. 354, nr 2, s. 659-683Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In 2002, Henkin and Michel proved a local Hartogs phenomenon for real analytic CR functions on real analytic weakly pseudoconcave CR manifolds. The aim of the present article is to remove the assumptions on real analyticity in the case of weakly pseudoconcave hypersurfaces {Mathematical expression} . If M is a graph of class {Mathematical expression} and n ≥ 3, a global theorem is proved for the extension of holomorphic germs along M. If the appearing domains have nicely shaped boundary, a Hartogs theorem even holds for continuous CR functions, where the difference to the case of holomorphic germs relies on the possible presence of lower-dimensional CR orbits. Levi flat hypersurfaces in {Mathematical expression} require a separate treatment. Here an affirmative answer is given to the question of Tomassini, whether 2-spheres bound 3-balls in M. © 2011 Springer-Verlag.

  • 85.
    Reyier Österling, Sofia
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Ferritsius, Olof
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Ferritsius, Rita
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    The influence of fiber dimensions on mechanical pulp long fiber tensile index and density2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 5, s. 844-859Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study discusses how fiber dimensions affect the tensile index and density of long fiber laboratory sheets. Five commercial mechanical pulps (three TMP grades, one SGW and one CTMP) were fractionated into five streams in a hydrocyclone pilot plant. Fiber dimensions and fibrillation were analyzed of the P16/R30 and P30/R50 fractions and compared to the sheet properties. For comparison, samples were also analyzed by SEM cross-sectional image analysis and in a MorFi Lab optical analyzer. Fibrillation index showed a high positive influence on long fiber tensile index and density, whereas fiber wall thickness, fiber width, and collapse resistance index a negative. Fiber width showed the vaguest correlation to long fiber tensile index and density of the analyzed fiber properties, but this increased when combined with fiber wall thickness into collapse resistance index, CRI. The correlations between fiber properties and sheet properties were on different levels for the different mechanical pulping processes, but a combination of collapse resistance index and fibrillation index into the novel factor BIN, Bonding ability INfluence, gave one linear relation of high correlation to long fiber tensile index for all pulps, except the SGW P30/R50 fraction, which showed the same linear correlation on a slightly lower level. BIN should be a useful tool in characterizing mechanical pulp fibers.

  • 86.
    Saleem, Jawad
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Majid, Abdul
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Bertilsson, Kent
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Carlberg, Torbjörn
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Nazar Ul Islam, Muhammad
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
    Nugget Formation During Resistance Spot Welding Using Finite Element Model2012Ingår i: World Academy of Science, Engineering and Technology: An International Journal of Science, Engineering and Technology, ISSN 2010-376X, E-ISSN 2070-3740, Vol. 67Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Resistance spot welding process comprises of electric, thermal and mechanical phenomenon, which makes this process complex and highly non-linear and thus, it becomes difficult to model it. In order to obtain good weld nugget during spot welding, hit and trial welds are usually done which is very costly. Therefore the numerical simulation research has been conducted to understand the whole process. In this paper three different cases were analyzed by varying the tip contact area and it was observed that, with the variation of tip contact area the nugget formation at the faying surface is affected. The tip contact area of the welding electrode becomes large with long welding cycles. Therefore in order to maintain consistency of nugget formation during the welding process, the current compensation in control feedback is required. If the contact area of the welding electrode tip is reduced, a large amount of current flows through the faying surface, as a result of which sputtering occurs.

  • 87.
    Salmi, Ari
    et al.
    VTT Tech Res Ctr Finland, Espoo, Finland.
    Salminen, Lauri I.
    VTT Tech Res Ctr Finland, Espoo, Finland.
    Engberg, Birgitta A.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Bjorkqvist, Tomas
    Tampere Univ Tech, Dept Automat Sci & Eng, Tampere, Finland.
    Haeggstrom, Edward
    Univ Helsinki, Elect Res Lab, Dept Phys, Div Mat Phys, Helsinki, Finland.
    Repetitive impact loading causes local plastic deformation in wood2012Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 111, nr 2, s. Art. no. 024901-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The relationship between the impactor velocity and the amount of strain localization in a single impact compression of cellular solids is known. However, few studies report on the effects of repeated high frequency compression. We therefore studied the mechanical behavior of Norway spruce, a cellular viscoelastic material, before, during, and after cyclic high frequency, high strain rate, compression. A custom made device applied 5000-20 000 unipolar (constrained compression and free relaxation) fatigue cycles with a 0.75 mm peak-to-peak amplitude at 500 Hz frequency. The consequences of this treatment were quantified by pitch-catch ultrasonic measurements and by dynamic material testing using an encapsulated Split-Hopkinson device that incorporated a high-speed camera. The ultrasonic measurements quantified a stiffness modulus drop and revealed the presence of a fatigued low modulus layer near the impacting surface. Such a localized plastic deformation is not predicted by classical mechanics. We introduce a simple model that explains several changes in the mechanical properties caused by fatiguing. The high speed images indicated pronounced strain localization in the weakest (thinnest walls) parts of the earlywood layers, and revealed strain propagation as a function of time. We present a hypothesis explaining why there is a fatigued layer formed in a piece of wood that has sustained cyclic compression and free relaxation. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3676206]

  • 88.
    Shuangzheng, Lin
    et al.
    Stockholm Univ, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden .
    Deiana, Luca
    Stockholm Univ, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden .
    Tseggai, Abrehet
    Stockholm Univ, Arrhenius Lab, Dept Organ Chem, S-10691 Stockholm, Sweden .
    Córdova, Armando
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Concise Total Synthesis of Dihydrocorynanthenol, Protoemetinol, Protoemetine, 3-epi-Protoemetinol and Emetine2012Ingår i: European Journal of Organic Chemistry, ISSN 1434-193X, E-ISSN 1099-0690, nr 2, s. 398-408Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A concise asymmetric assembly of secologanine tryptamine and dopamine alkaloids by means of a one-pot three-component cascade reaction methodology is disclosed. This is demonstrated by the expeditious total syntheses of (-)-dihydrocorynanthenol, (-)-protoemetinol, (-)-protoemetine, (-)-3-epi-protoemetinol, and emetine (3-6 steps). The biomimetic synthetic strategy involved the following key steps: (i) One-pot three-component highly enantioselective catalytic Michael/Pictet-Spengler/lactamization cascade reactions; (ii) One-pot tandem Swern oxidation/Wittig sequences; (iii) One-pot tandem hydrogenation sequences.

  • 89.
    Shuangzheng, Lin
    et al.
    Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden.
    Tseggai, Abrehet
    Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91 Stockholm, Sweden.
    Córdova, Armando
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Concise catalytic asymmetric total synthesis of biologically active tropane alkaloids2012Ingår i: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 354, nr 7, s. 1363-1372Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A general strategy for the total asymmetric synthesis of valuable tropane alkaloids by catalytic stereoselective transformations is disclosed. The power of this approach is exemplified by the concise catalytic enantioselective total syntheses of (+)-methylecgonine, (-)-cocaine and (+)-cocaine as well as the first catalytic asymmetric total syntheses of a cocaine C-1 derivative and (+)-ferruginine starting from 5-oxo-protected-α,β-unsaturated enals using only two and three column chromatographic purification steps, respectively. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  • 90.
    Stage, Jesper
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för samhällsvetenskap.
    Zimmerman, Jenny
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Crayfish management in the Ljungan river: Managing with shocks2012Konferensbidrag (Övrigt vetenskapligt)
  • 91.
    Stage, Jesper
    et al.
    Mittuniversitetet, Fakulteten för humanvetenskap, Institutionen för samhällsvetenskap (-2013).
    Zimmerman, Jenny K M
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design (-2013).
    Crayfish management in the Ljungan river: Managing with shocks2012Ingår i: Visible Possibilities: The Economics of Sustainable Fisheries, Aquaculture and Seafood Trade: Proceedings of the Sixteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 16-20, Dar es Salaam, Tanzania / [ed] Ann L. Shriver, 2012Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]
    • The noble crayfish fishery in the Ljungan river system in Sweden has been subjected to two major shocks; hydropower development in the 1970s, which reduced water flow throughout the system with attendant effects on the crayfish stocks, and an outbreak of crayfish plague in the 1990s which wiped out the noble crayfish in most of the river system. Differing ownership structures for the fishing rights in different parts of the river system have led to different management systems, ranging from sole private ownership through management by fishermen's associations through to effective open access fishing. We study how these different systems of management have affected the crayfish, and compare the outcomes to those from the hydropower development in the 1970s.

  • 92.
    Strand, Anders
    et al.
    Åbo Akademi Finland / Turku.
    Zasadowski, Dariusz
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Norgren, Magnus
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Hedenström, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Willför, Stefan
    Åbo Akademi Finland / Turku.
    Sundberg, Anna
    Åbo Akademi Finland / Turku.
    Selective froth flotation of pitch components from spruce TMP process water2012Ingår i: Appita journal, ISSN 1038-6807, Vol. 65, nr 4, s. 337-346Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Selective removal of dissolved and colloidal pitch components from an unbleached thermomechanical pulp (TMP)

    pressate by addition of a cationic foaming agent, dodecyltrimethylammonium chloride (DoTAC), and subsequent froth

    flotation was assessed. The experiments were conducted with varying pH, temperature, and concentrations of DoTAC

    and calcium. The concentrations of pitch components, lignans, and dissolved polysaccharides were determined

    before and after flotation.

    All pitch components were removed more efficiently by flotation at pH 5 and 3.5 than by flotation at pH 7.6. Resin

    and fatty acids were removed to a higher degree than neutral pitch substances at all the tested pH levels. Most of the

    water-soluble uronic acids and galactoglucomannans stayed in the TMP water after flotation.

    Froth flotation with DoTAC was an effective way of selectively removing colloidal and dissolved pitch. Removal of pitch,

    especially of resin acids, at an early stage should be beneficial to the overall papermaking process.

  • 93.
    Svahn, Carina
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Gylle, Maria
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Ekelund, Nils G. A.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Photosynthetic activity in marine and brackish water strains of Fucus vesiculosus and Fucus radicans (Phaeophyceae) at different light qualities2012Ingår i: Photochemistry and Photobiology, ISSN 0031-8655, E-ISSN 1751-1097, Vol. 88, nr 6, s. 1455-1460Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study investigates the effects of different light qualities on the photosynthetic capacity of the brown algae Fucus vesiculosus, from the Norwegian Sea, and Fucus radicans and F. vesiculosus, from the Bothnian Sea. The electron transport rates (ETR) obtained for F. vesiculosus from the Norwegian Sea showed significantly higher levels of light saturation compared with both species of algae from the Bothnian Sea. The maximum of ETR values for the Norwegian Sea strain showed no significant changes due to varying light quality compared with the initial values. For F. vesiculosus, from the Bothnian Sea, treatment with blue light showed an effect after 1 week of 30 and 90 μmol photons m -2 s -1 (P &lt; 0.01), and for F. radicans from the Bothnian Sea, at the irradiance of 90 μmol photons m -2 s -1 and 1 week (P &lt; 0.01). After 1 week in the Bothnian Sea species and after 2 weeks in F. vesiculosus from the Norwegian Sea, the photosynthetic efficiency (α) was significantly higher regardless of light quality and irradiance compared with the initial values. Variation in light quality and irradiance had minor effects on the F v:F m values of the three algal strains studied. © 2012 Wiley Periodicals, Inc. Photochemistry and Photobiology © 2012 The American Society of Photobiology.

  • 94.
    Svensson, G. P.
    et al.
    Department of Biology, Lund University, Ecology Building, Lund, 223 62, Sweden.
    Liedtke, C.
    Department of Biology, Lund University, Ecology Building, Lund, 223 62, Sweden.
    Hedenström, Erik
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Breistein, Palle
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Bång, Joakim
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Larsson, M. C.
    Department of Plant Protection Biology, Swedish University of Agricultural Sciences, P.O. Box 102, Alnarp, 230 53, Sweden.
    Chemical ecology and insect conservation: optimising pheromone-based monitoring of the threatened saproxylic click beetle Elater ferrugineus2012Ingår i: Journal of Insect Conservation, ISSN 1366-638X, E-ISSN 1572-9753, Vol. 16, nr 4, s. 549-555Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Elater ferrugineus is a saproxylic click beetle inhabiting old deciduous trees in Europe. It is threatened throughout its area of distribution due to habitat loss. No efficient monitoring method has been available for this species, but observed attraction of females to (R)-(+)-γ-decalactone, which is a male-produced sex pheromone of its prey, the scarab beetle Osmoderma eremita, has led to the development of an odour lure for monitoring. In addition, four esters have recently been identified from the pheromone-producing gland in female E. ferrugineus, and a blend of these esters is highly attractive to conspecific males in the field, revealing an alternative odour-based method for monitoring this species. However, no rigorous analysis has been performed to check whether all four esters show biological activity in male E. ferrugineus, and whether its own sex pheromone is a more potent lure than the prey kairomone for monitoring of E. ferrugineus. In this study, we reinvestigated the E. ferrugineus sex pheromone, using electrophysiological and behavioural analyses, and found that only one of the esters, 7-methyloctyl (Z)-4-decenoate, is active. In addition, trapping experiments revealed that 7-methyloctyl (Z)-4-decenoate is a much more efficient attractant for male E. ferrugineus than the prey pheromone is for conspecific females, or any sex of O. eremita. With a very efficient odour lure at hand, novel information about current distribution, local population sizes, and dispersal ranges in E. ferrugineus can now be obtained, which can aid in conservation efforts to protect this threatened insect and its habitat. © 2011 Springer Science+Business Media B.V.

  • 95.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Fibre-fibre bond: What paper physicist sees2012Konferensbidrag (Övrigt vetenskapligt)
  • 96.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Mechanics in printing nip for paper and board2012Ingår i: Mechanics of paper products / [ed] K. Niskanen, Berlin: Mouton de Gruyter, 2012, s. 181-193Kapitel i bok, del av antologi (Refereegranskat)
  • 97.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Statistical aspects of failure of paper and board2012Ingår i: Mechanics of paper products / [ed] K. Niskanen, Berlin: Mouton de Gruyter, 2012, s. 139-159Kapitel i bok, del av antologi (Refereegranskat)
  • 98.
    Uesaka, Tetsu
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Web dynamics in paper transport systems2012Ingår i: Engineering Mechanics of Paper and Board Products / [ed] K. Niskanen, Berlin: Mouton de Gruyter, 2012, s. 93-110Kapitel i bok, del av antologi (Refereegranskat)
  • 99.
    Uesaka, Tetsu
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Juntunen, Janne
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Time-dependent, stochastic failure of paper and box2012Ingår i: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, nr 2, s. 370-374Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Time-dependent, stochastic failure is most common in practical situations where paper and board are used, such as web breaks and box failure. A theoretical treatment has been presented, starting from Coleman's stochastic failure model to the models with structural hierarchy. Creep failure data of box and board published in the literature were analysed from the light of the proposed theoretical model. The results showed that the distribution of life time (not only mean life time) of corrugated boxes changes very sensitively with loading and environmental conditions. Generally the coefficient of variation varied from 6% to 90%. Another important parameter, the load sensitivity of damage growth also varied from 1.7 to 27. Such enormous variation of the key parameters is not a mere fluctuation of experimental condition, but represents the very nature of timedependent, stochastic failure. The stochastic failure model presented provides a framework for analyzing experimental data as well as for predicting life time distributions under general fluctuating loading conditions other than creep.

  • 100.
    Uesaka, Tetsu
    et al.
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Wiklund, Hanna
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Holmvall, Martin
    Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för tillämpad naturvetenskap och design.
    Fluid-Structure Interactions in Random Fibre Networks2012Konferensbidrag (Refereegranskat)
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