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Wyświetlanie 1-10 z 11
Tytuł:
Calculation of maximal collision force in kinematic chains based on collision force impulse
Autorzy:
Warzecha, Mariusz
Michalczyk, Jerzy
Tematy:
collision modeling
impact force
kinematic chain
multibody
Pokaż więcej
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:
https://bibliotekanauki.pl/articles/1839656.pdf  Link otwiera się w nowym oknie
Opis:
This paper presents a new method for calculating maximal collision forces in kinematic chains based on their impulses. Its main advantage is its simplicity as it is based on algebraic equations. Collisions between the feed, hammer and rotor in a hammer crusher are used as a case study to show the implementation of the proposed method. The obtained results are then compared with a reference time-domain model. The proposed method can be used by mechanical engineers in early design phases to estimate loads acting on parts during collisions as well as to search for more optimal geometrical parameters.
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The first record of a rare marine tardigrade, Halobiotus crispae Kristensen, 1982 (Eutardigrada : Hypsibiidae), from the Svalbard Archipelago
Autorzy:
Michalczyk, Łukasz
Huzarska, Katarzyna
Kaczmarek, Łukasz
Smykla, Jerzy
Opis:
A rare marine tardigrade Halobiotus crispae Kristensen, 1982 was found abundant in intertidal flats at Josephbukta, Bellsund fiord, West Spitsbergen. This is the first record of this species from the Svalbard Archipelago. So far, the species has been found only in seven other localities in the northern hemisphere (between 56$^{\circ}$ and 69$^{\circ}$N). The present record greatly extends the known geographical range to the north and also indicates a much wider distribution of the species than formerly reported. Moreover, a potential indicative character of this species and of the study area in monitoring climatic changes is discussed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Distribution and diversity of Tardigrada along altitudinal gradients in the Hornsund, Spitsbergen (Arctic)
Autorzy:
Michalczyk, Łukasz
Kaczmarek, Łukasz
Zawierucha, Krzysztof
Gołdyn, Bartłomiej
Smykla, Jerzy
Opis:
Two transects were established and sampled along altitudinal gradients on the slopes of Ariekammen (77 degrees 01'N; 15 degrees 31'E) and Rotjesfjellet (77 degrees 00'N; 15 degrees 22'E) in Hornsund, Spitsbergen. In total 59 moss, lichen, liverwort and mixed moss-lichen samples were collected and 33 tardigrade species of Hetero- and Eutardigrada were found. The alpha diversity ranged from 1 to 8 per sample; the estimated number of species based on all analysed samples was 52±17 for the Chao 2 estimator and 41 for the incidence-based coverage estimator. According to the results of detrended canonical correspondence analysis, altitude and type of substratum were the most important factors influencing tardigrade communities in the investigated area. Macrobiotus crenulatus, M. hufelandi hufelandi and Hypsibius pallidus dominated in the lower elevations, whereas Echiniscus wendti and E. merokensis merokensis prevailed in samples from higher plots. Macrobiotus islandicus islandicus was collected most often from mosses collected from rock whereas Isohypsibius coulsoni from mosses collected from soil. Analyses of covariance were employed to test for differences in species richness between the transects in relation to altitude. Contrary to expectations, there were significant differences in species richness between the transects, but richness was not significantly related to altitude. Interestingly, significant effects of colonies of seabirds, little auk (Alle alle), on the tardigrades communities were detected. Additionally, in one of the samples first ever males of Milnesium asiaticum were found. Their measurements and microphotographs are provided herein.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Liver oxidative status, serum lipids levels after bariatric surgery and high-fat, high-sugar diet in animal model of induced obesity
Autorzy:
Chełmecka, Elżbieta
Rutkowski, Jakub
Kazura, Wojciech
Skrzep-Poloczek, Bronisława
Michalczyk, Katarzyna
Zalejska-Fiolka, Jolanta
Kukla, Michał
Michalski, Marek
Stygar, Dominika
Jochem, Jerzy
Opis:
Nutritional status is a major determinant of hepatocyte injuries associated with changed metabolism and oxidative stress. This study aimed to determine the relations between oxidative stress, bariatric surgery, and a high-fat/high-sugar (HFS) diet in a diet-induced obesity rat model. Male rats were maintained on a control diet (CD) or high-fat/high-sugar diet (HFS) inducing obesity. After 8 weeks, the animals underwent SHAM (n = 14) or DJOS (n = 14) surgery and the diet was either changed or unchanged. Eight weeks after the surgeries, the activity of superoxide dismutase isoforms (total SOD, MnSOD, and CuZnSOD), catalase (CAT), glutathione peroxidase (GPx), glutathione reductase (GR), and lutathione S-transferase, as well as the thiol groups (-SH) concentration, total antioxidant capacity (TAC), total oxidative stress (TOS) levels, and malondialdehyde (MDA) concentration liver tissue were assessed. The total cholesterol, triglycerides (TG), and high-density lipoprotein (HDL) concentrations were measured in the serum. The total SOD and GPX activities were higher in the SHAM-operated rats than in the DJOS-operated rats. The MnSOD activity was higher in the HFS/HFS than the CD/CD groups. Higher CuZnSOD, GST, GR activities, -SH, and MDA concentrations in the liver, and the triglyceride and cholesterol concentrations in the serum were observed in the SHAM-operated rats than in the DJOS-operated rats. The CAT activity was significantly higher in the HFS-fed rats. Lower TAC and higher TOS values were observed in the SHAM-operated rats. Unhealthy habits after bariatric surgery may be responsible for treatment failure and establishing an obesity condition with increased oxidative stress.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A 21-day individual rehabilitation exercise training program changes irisin, chemerin, and BDNF levels in patients after hip or knee replacement surgery
Autorzy:
Kukla, Michał
Bogielski, Bartosz
Stygar, Dominika
Poloczek, Jakub
Skrzep-Poloczek, Bronisława
Michalczyk, Katarzyna
Chełmecka, Elżbieta
Zalejska-Fiolka, Jolanta
Jochem, Jerzy
Nowak, Damian
Idzik, Maciej
Opis:
Osteoarthritis (OA) is the most frequent worldwide cause of adult population disabilities. The study evaluated the effects of a 21-day individual rehabilitation exercise training program focused on improving patients’ functional capacity. The study analyzed the changes in irisin, chemerin, and BDNF serum levels in 36 OA patients subjected to an individually-adjusted rehabilitation program 90 days after surgical hip or knee replacement. The changes in irisin, chemerin, and BDNF serum levels were measured using enzyme-linked immunosorbent assay (ELISA) kits. A 21-day individual rehabilitation exercise training program significantly increased irisin and BDNF, and decreased chemerin serum levels. The presented study indicates that individually-adjusted exercise training is an important modulator influencing serum levels of anti- and pro-inflammatory factors, leading to positive clinical outcomes in osteoarthritis therapy. Selected factors are considered potential markers of various pathophysiological conditions. The presented study brings new details to the discussion.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Psychopathology and integrity of the superior longitudinal fasciculus in deficit and nondeficit schizophrenia
Autorzy:
Tyburski, Ernest
Kucharska-Mazur, Jolanta
Samochowiec, Jerzy
Rudkowski, Krzysztof
Podwalski, Piotr
Szczygieł, Krzysztof
Misiak, Błażej
Michalczyk, Anna
Sagan, Leszek
Cyranka, Katarzyna
Andrusewicz, Wojciech
Waszczuk, Katarzyna
Mak, Monika
Opis:
The superior longitudinal fasciculus (SLF) is a white matter bundle that connects the frontal areas with the parietal areas. As part of the visuospatial attentional network, it may be involved in the development of schizophrenia. Deficit syndrome (DS) is characterized by primary and enduring negative symptoms. The present study assessed SLF integrity in DS and nondeficit schizophrenia (NDS) patients and examined possible relationships between it and psychopathology. Twenty-six DS patients, 42 NDS patients, and 36 healthy controls (HC) underwent psychiatric evaluation and diffusion tensor imaging (DTI). After post-processing, fractional anisotropy (FA) values within the SLF were analyzed. Psychopathology was assessed with the Positive and Negative Syndrome Scale, Brief Negative Symptom Scale, and Self-evaluation of Negative Symptoms. The PANSS proxy for the deficit syndrome was used to diagnose DS. NDS patients had lower FA values than HC. DS patients had greater negative symptoms than NDS patients. After differentiating clinical groups and HC, we found no significant correlations between DTI measures and psychopathological dimensions. These results suggest that changes in SLF integrity are related to schizophrenia, and frontoparietal dysconnection plays a role in its etiopathogenesis. We confirmed that DS patients have greater negative psychopathology than NDS patients. These results are preliminary; further studies are needed.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Wyświetlanie 1-10 z 11

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