| 1. |
- Gejl, Kasper D., et al.
(författare)
-
Contractile Properties of MHC I and II Fibers From Highly Trained Arm and Leg Muscles of Cross-Country Skiers
- 2021
-
Ingår i: Frontiers in Physiology. - : Frontiers Media S.A.. - 1664-042X. ; 12
-
Tidskriftsartikel (refereegranskat)abstract
- Little is known about potential differences in contractile properties of muscle fibers of the same type in arms and legs. Accordingly, the present study was designed to compare the force-generating capacity and Ca2+ sensitivity of fibers from arm and leg muscles of highly trained cross-country skiers. Method: Single muscle fibers of m. vastus lateralis and m. triceps brachii of 8 highly trained cross-country skiers were analyzed with respect to maximal Ca2+-activated force, specific force and Ca2+ sensitivity. Result: The maximal Ca2+-activated force was greater for MHC II than MHC I fibers in both the arm (+62 %, P < 0.001) and leg muscle (+77 %, P < 0.001), with no differences between limbs for each MHC isoform. In addition, the specific force of MHC II fibers was higher than that of MHC I fibers in both arms (+41 %, P = 0.002) and legs (+95 %, P < 0.001). The specific force of MHC II fibers was the same in both limbs, whereas MHC I fibers from the m. triceps brachii were, on average, 39% stronger than fibers of the same type from the m. vastus lateralis (P = 0.003). pCa50 was not different between MHC I and II fibers in neither arms nor legs, but the MHC I fibers of m. triceps brachii demonstrated higher Ca2+ sensitivity than fibers of the same type from m. vastus lateralis (P = 0.007). Conclusion: Comparison of muscles in limbs equally well trained revealed that MHC I fibers in the arm muscle exhibited a higher specific force-generating capacity and greater Ca2+ sensitivity than the same type of fiber in the leg, with no such difference in the case of MHC II fibers. These distinct differences in the properties of fibers of the same type in equally well-trained muscles open new perspectives in muscle physiology.
|
|
| 2. |
- Holmberg Runsten, John, Librarian, 1984-, et al.
(författare)
-
Extraction and Analysis of Citation Data from Student Output in Order to Improve Library Instruction
- 2023
-
Konferensbidrag (refereegranskat)abstract
- At the Mid Sweden University (MiUN) students are expected to cite relevant and domain specific intellectual authorities when writing their papers and theses. To help students achieve this, the University Library at MiUN provides instruction. Here, a proposed approach of improving library instruction is to study the sources which students cite.Extracting references manually is labour intensive and thus unrealistic to undertake systematically. We therefore present a method, using Open Source software (AnyStyle and R), that parses, extracts, and compiles citation data from theses stored in pdf format on an institutional repository, making it possible to perform source analysis and study co-citation patterns.Output from researchers affiliated to the same institution and active within the same field of study as the students can act as a baseline by which comparisons can be performed. These researchers are frequently the students’ teachers, and have therefore potentially played a part in assembling their required reading lists.With this approach we propose that library instruction can be revised and improved using methods frequently employed within research evaluation. Findings can also be forwarded to teachers and course administrators, rendering the library an active partner in course development and assessment. In addition, providing information regarding inter-disciplinary influences that impact students as well as revealing differences between research and educational output.
|
|
| 3. |
- Hosseini, Seyed, et al.
(författare)
-
Comparison of machining performance of stainless steel 316L produced by selective laser melting and electron beam melting
- 2022
-
Ingår i: Procedia CIRP. - : Elsevier B.V.. - 2212-8271. ; , s. 72-77
-
Konferensbidrag (refereegranskat)abstract
- Powder bed fusion processes based additively manufactured SS 316L components fall short of surface integrity requirements needed for optimal functional performance. Hence, machining is required to achieve dimensional accuracy and to enhance surface integrity characteristics. This research is focused on comparing the material removal performance of 316L produced by PBF-LB (laser) and PBF-EB (electron beam) in terms of tool wear and surface integrity. The results showed comparable surface topography and residual stress profiles. While the hardness profiles revealed work hardening at the surface where PBF-LB specimens being more susceptible to work hardening. The investigation also revealed differences in the progress of the tool wear when machining specimens produced with either PBF-LB or PBF-EB. .
|
|
