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- Dupre, C
(författare)
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How to determine a regional species pool: a study in two Swedish regions
- 2000
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Ingår i: OIKOS. - : MUNKSGAARD INT PUBL LTD. - 0030-1299. ; 89:1, s. 128-136
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Tidskriftsartikel (refereegranskat)abstract
- The species pool hypothesis has been proposed as one of the possible explanations for the local species richness of plant communities. For testing and validating this theory, it is of crucial importance to determine the dimension of the regional pool, whi
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| 2. |
- Clementson, Martin, et al.
(författare)
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Sclerosing injections in midportion Achilles tendinopathy: a retrospective study of 25 patients.
- 2008
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Ingår i: Knee Surgery, Sports Traumatology, Arthroscopy. - : Springer Science and Business Media LLC. - 1433-7347 .- 0942-2056. ; Jun 13, s. 887-890
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Tidskriftsartikel (refereegranskat)abstract
- Sclerosing injections under ultrasonographic guidance is a new method of treatment for persistent pain in Achilles tendinosis. Good results, even superior to those of surgery, have been described. We report the outcome of 25 patients with midportion tendinosis receiving sclerosing treatment. Twenty-eight consecutive patients (29 tendons) with ultrasonographical findings of midportion tendinosis examined during the period November 2004 to November 2005 were identified in the database of the Department of Radiology, Malmö University Hospital. Twenty-five patients (26 tendons) were found suitable for treatment. Follow-up consisted of self-assessment questionnaire or phone interview. In 19 patients (20 tendons), results were good or excellent. Complications were few and mild. We conclude that sclerosing injections is a promising alternative to surgery in chronic Achilles midportion tendinosis. Our results are comparable to those obtained with surgery, but the procedure is less invasive. However, a few cases of tendinosis lack detectable neovessels and may still be candidates for surgery.
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| 3. |
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| 4. |
- Wolf, Michael, 1989-
(författare)
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Energetic processing of complex molecules in the gas phase
- 2018
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Collisions between molecules and gas phase targets often lead to various intriguing processes. Such collisions may induce fragmentation of molecules that can be divided into different subsets depending on the projectile, target, and collision energy. One major part of the present research is the exploration of astrophysical relevant collision mechanisms. In collisions between polycyclic aromatic hydrocarbon (PAH) molecules or fullerenes with, for example, helium, nuclear stopping can lead to the prompt knockout of a carbon atom from the molecule. Such a vacancy in the molecular carbon backbone can be highly reactive, and lead to the formation of larger molecules. The energy dependencies of such processes are important for the understanding of astrochemical molecular growth processes, which in turn may lead to the formation of larger and more complex molecules in space. In addition, hydrogenation of PAHs changes their structures and internal properties, including their resistance against fragmentation. To better understand the effects of hydrogenation on the fragmentation of PAHs, low energy photofragmentation experiments are presented along with the collision experiments, and a detailed comparison is made between the effects of these different types of energy transfer processes.Besides astrophysically relevant research, studies on the response of biomolecules to collisions with gas phase targets are presented. Here, the energy dependence for formation of the protonated n-butyl β-ionone Schiff base through electrocyclization of the protonated n-butylamine Schiff base of all-trans-retinal in collisions is presented. The latter is a model compound for all-trans-retinal, the chromophore of the light sensitive opsin proteins, and such studies are essential for the understanding of the operation of mammal vision.While our collision studies are very successful, they are sometimes also limited by the experimental timescale. Therefore, we have constructed an experimental setup for ion storage and fragmentation analysis. The goal of this new experiment is to store internally hot fragments to investigate their behavior on extended timescales and as functions of internal excitation energies.
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| 5. |
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| 6. |
- Wang, C., et al.
(författare)
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Phase-locking of multiple magnetic droplets by a microwave magnetic field
- 2017
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Ingår i: AIP Advances. - : American Institute of Physics Inc.. - 2158-3226. ; 7:5
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Tidskriftsartikel (refereegranskat)abstract
- Manipulating dissipative magnetic droplet is of great interest for both the fundamental and technological reasons due to its potential applications in the high frequency spin-torque nano-oscillators. In this paper, a magnetic droplet pair localized in two identical or non-identical nano-contacts in a magnetic thin film with perpendicular anisotropy can phase-lock into a single resonance state by using an oscillating microwave magnetic field. This resonance state is a little away from the intrinsic precession frequency of the magnetic droplets. We found that the phase-locking frequency range increases with the increase of the microwave field strength. Furthermore, multiple droplets with a random initial phase can also be synchronized by a microwave field.
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| 7. |
- Carle, Jan, 1955
(författare)
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Blåser det en högervind bland ungdomen
- 1992
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Ingår i: Locus - Tidskrift för barn och ungdomsvetenskap. - 1100-3197. ; Vol 4:4
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Tidskriftsartikel (refereegranskat)
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| 8. |
- Stavropoulos, Andreas, et al.
(författare)
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Timeframe of socket corticalization after tooth extraction : A retrospective radiographic study
- 2017
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Ingår i: Clinical Oral Implants Research. - : John Wiley & Sons. - 0905-7161 .- 1600-0501. ; 28:S14, s. 58-58
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- Background The formation of a hard-tissue bridge covering the tooth extraction socket is termed corticalization. In dogs this process takes >60d, however, this process has hardly been investigated in humans. Recent reports have indicated increased primary implant stability and reduced bone strain after immediate implant loading in the presence of a (thick) cortical layer, thus, knowledge of the timeframe between tooth extraction and hard-tissue bridging of the extraction socket appears clinically relevant in some situations. Aim/Hypothesis To determine the timeframe between tooth extraction and radiographically detectable corticalization of the socket in humans and to evaluate the possible impact of various factors on this process, e.g., history of periodontitis, smoking status, systemic disease, medications, etc. Material and Methods Two-hundred-fifty patients with a CT scan μ 8804, 36 months after tooth extraction and without any manipulation at the extraction site were included. Three orthoradial multiplanar reconstruction slices per extraction socket were scored, by a single calibrated examiner, regarding the degree of corticalization as: (a) healed, i.e., complete/continuous corticalization of the socket entrance, or (b) non-healed. Thereafter, each extraction socket was classified as (1) non-corticalized, i.e., all 3 slices classified as non-healed, (2) partially corticalized, i.e., 1 or 2 slices classified as non-healed, or (3) corticalized, i.e., all 3 slices classified as healed (Figure 1). The possible effect of several independent parameters, i.e., age, gender, timeframe between tooth extraction and CT scan, tooth type, periodontal status, gap dimension, smoking status, presence of any systemic disease, and medication intake, on the corticalization status was statistically evaluated. Results Three to 6 months after tooth extraction, 27% of the sockets were judged as non-corticalized, and 53% were judged as partially corticalized. After 9 to 12 months, >80% of the sockets were corticalized, but some non-corticalized sockets were detected up to 15 months post-extraction (Figure 2). Each additional month after tooth extraction contributed significantly to higher likelihood of a corticalized socket (OR 1.645, 95% CIs 1.471–1.841, P < 0.001). Periodontal attachment loss of μ 8805, 75% significantly prolonged corticalization time, i.e., teeth with <75% attachment loss were judged more often as corticalized (OR 1.984, 95% CIs 1.011–3.896, P = 0.047). No other independent variable had a significant effect on corticalization status. Conclusions and Clinical Implications Three to 6 months after tooth extraction one out of 4 sockets was still completely non corticalized, and only 9 to 12 months after tooth extraction complete corticalization was observed in about 80% of the sockets. The results, indicating a considerably long timeframe until corticalization of extraction sockets, imply that in cases where immediate loading requiring high primary implant stability is considered, waiting μ 8805,9 months post-extraction appears advisable.
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| 9. |
- Chaudhury, Asim, et al.
(författare)
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Low silicon non-grain-oriented electrical steel: Linking magnetic properties with metallurgical factors
- 2007
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Ingår i: Journal of Magnetism and Magnetic Materials. - : Elsevier BV. - 0304-8853 .- 1873-4766. ; 313:1, s. 21-28
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Tidskriftsartikel (refereegranskat)abstract
- Commercial supply, from several steel manufacturers, of low-silicon non-grain-oriented electrical steel was monitored over a span of several years. A total of 51 samples were selected-selected from many hundreds on the basis of large differences in magnetic properties, but absence of significant variations in chemistry (other than differences in silicon percentage). The selected samples were analyzed for crystallographic texture and for grain size. The data were carefully analyzed to bring out the effects of metallurgical variables, namely silicon %, grain size and crystallographic texture, on the magnetic properties using explicit functional relationships as well as artificial neural network (ANN). Among the explicit relationships, power law relationship appears to offer a best fit between magnetic properties and the metallurgical factors. ANN approach to the relationship, however, brought out predicted values with least error
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| 10. |
- Wang, Chunliang, 1980-, et al.
(författare)
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Pelvis segmentation using multi-pass U-Net and iterative shape estimation
- 2018
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Ingår i: Computational Methods and Clinical Applications in Musculoskeletal Imaging. - Cham : Springer. - 9783030111656 ; , s. 49-57
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Konferensbidrag (refereegranskat)abstract
- In this report, an automatic method for segmentation of the pelvis in three-dimensional (3D) computed tomography (CT) images is proposed. The method is based on a 3D U-net which has as input the 3D CT image and estimated volumetric shape models of the targeted structures and which returns the probability maps of each structure. During training, the 3D U-net is initially trained using blank shape context inputs to generate the segmentation masks, i.e. relying only on the image channel of the input. The preliminary segmentation results are used to estimate a new shape model, which is then fed to the same network again, with the input images. With the additional shape context information, the U-net is trained again to generate better segmentation results. During the testing phase, the input image is fed through the same 3D U-net multiple times, first with blank shape context channels and then with iteratively re-estimated shape models. Preliminary results show that the proposed multi-pass U-net with iterative shape estimation outperforms both 2D and 3D conventional U-nets without the shape model.
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