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    Wyświetlanie 1-6 z 6
    Tytuł:
    The Influence of Functional Movement Screen Results on the Frequency of Sports Injuries in Soccer Players
    Autorzy:
    Kryger, Krzysztof
    Wieczorek, Andrzej
    Wieczorek, Jacek
    Śliwowski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/1030757.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    FMS
    junior players
    trauma risk
    Opis:
    Functional Movement Screen (FMS) is a functional screen test of the motor system which is steadily gaining recognition and popularity among individuals interested in prevention of sports injuries. The FMS test battery includes seven mutually related motor activities to analyse the quality of basic movement patterns. An in-depth interpretation of the performed test design provides good conditions to determine the weakest links in the kinematic chain and to estimate the risk of injury. The objective of this study was to determine the effect of the FMS test results on frequency of sports injuries in soccer players. With the main objective of the study in mind the following research hypothesis was formulated: “a group of players in the lowest interval (14–17 FMS test points) will have a high frequency of injuries in comparison to a group in the upper interval (18–21 points in the FMS test)”. The tests were carried out on a group of 102 younger and older junior soccer players representing the Soccer Academy of KKS Lech Poznań. For that the test design with FMS test procedure was used, followed by a six month period in which the injuries of the individuals in the study group were recorded. The research hypothesis was not confirmed. In the analysis of the results no statistical significance was noted between the total number of points obtained in the FMS test and the number of injuries. It was noted that the number of injuries was statistically significantly correlated with the results of the Shoulder Mobility test of the right side (for all participants and for the players in the lower interval), Hurdle Step test of the left side (for a group of players in the lower interval), and the In-line Lunge test of the left side (for upper interval players). The results of the single variable logistic regression showed that injuries occurred more often in players of the lower interval. A forest plot indicates the direction of the increased risk of injury in players in the lower interval of points: OR = 1.14 (95% CL; 0.71 : 1.83).
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2019, 27, 3; 41-53
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sport injuries in elite amputee football players
    Autorzy:
    Wieczorek, Jacek
    Wieczorek, Andrzej
    Bauerfeind, Joanna
    Grzelińska, Paula
    Śliwowski, Robert
    Tasiemski, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/1055034.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    adapted sports
    amputee football
    disability
    sport games
    sport injuries
    Opis:
    Despite many previous studies dealing with various aspects of physical activity in individuals with an amputation, the risk of injury in amputee footballers has not been assessed thus far. The aim of this study was to characterize the incidence and causes of sport injuries experienced by amputee football players. Furthermore, the incidence of injuries was stratified according to the players’ level of competitive aggressiveness and anger, and their role in the field. The study included 21 members of the Polish National Amputee Football Team, who have been followed-up for a period of 6 months. A total of 16 injuries were recorded, including three that required a medical consultation: luxation of the left elbow, adductor strain and ankle sprain. The group of injuries that have not been consulted with a physician included muscle strains (n = 4), abrasions (n = 3), bruising (n = 3), joint subluxations (n = 2) and luxation (n = 1). The injuries turned out to be more frequent in the lower limbs (n = 10) than in the upper ones (n = 6). The risk of injury turned out to be higher during trainings (n = 9) than matches (n = 7). Amputee football seems to be associated with low risk of injury, since only several bodily contusions were documented throughout the study period. The injuries occurred in 38% of the players; this makes amputee football a relatively safe discipline which can be recommended to physically disabled persons.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2017, 18, 2; 13-22
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and characteristics of trypsin inhibitors from the seeds of squash (Cucurbita maxima) and zucchini (Cucurbita pepo, vcir. Giromontia)
    Autorzy:
    Leluk, Jacek
    Otlewski, Jacek
    Wieczorek, Maciej
    Polanowski, Antoni
    Wilusz, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1046066.pdf
    Data publikacji:
    1983
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Źródło:
    Acta Biochimica Polonica; 1983, 30, 2; 127-138
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of calcinated halloysite on structure and properties of rigid poly(vinyl chloride) composites
    Autorzy:
    Wieczorek, Martina
    Tomaszewska, Jolanta
    Bajda, Tomasz
    Długosz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2202880.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polymer composites
    mechanical properties
    thermal properties
    halloysite
    poly(vinyl chloride)
    kompozyty polimerowe
    właściwości mechaniczne
    właściwości termiczne
    haloizyt
    chlorek winylu
    Opis:
    Halloysite is a filler which may be used to produce composites with thermoplastic polymer matrix. This work summarized the results of investigations of processing, structural, mechanical, and thermal properties of the composites with poly(vinyl chloride) (PVC) matrix and raw halloysite (HA) as well as its calcined product (KHA). The effectiveness of calcination was confirmed with X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, and nitrogen adsorption method. The PVC composites with HA as well as KHA were processed in the molten state in the Brabender mixer chamber. The reduction of gelation time and simultaneous increase in maximum torque with filler content were found based on the results of plastographometric analysis. SEM images of PVC/halloysite composites showed a homogeneous distribution of the filler in the polymer matrix. The introduction of halloysite leads to a slight increase in Young’s modulus and tensile strength compared to neat PVC, where the increase of both parameters is greater when KHA is used. The incorporation of 1% KHA led to an increase in impact strength, an effect which may be attributed to toughening of the polymer. A slight improvement of the Vicat softening temperature of 2.7 degrees C for PVC/HA and heat deflection temperature of 2.4 C for PVC/KHA was also ascertained for PVC modified with 10 wt% of filler.
    Źródło:
    Chemical and Process Engineering; 2022, 43, 3; 383--404
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of hard coal and its mixtures with water subjected to friction
    Charakterystyka właściwości węgla kamiennego i jego mieszanin z wodą poddanych tarciu
    Autorzy:
    Jonczy, Iwona
    Wieczorek, Andrzej N.
    Podwórny, Jacek
    Gerle, Anna
    Staszuk, Marcin
    Szweblik, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/216570.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    hard coal
    friction
    wear test
    węgiel kamienny
    tarcie
    proces zużyciowy
    Opis:
    This paper deals with issues related to tribological processes occurring as a result of excessive wear of the surface of scraper conveyor components caused by the impact of the mined material created during drilling of development or exploitation galleries. One of the most common types of tribological wear is abrasive wear. Wear tests were carried out for hard coal – based abrasive using dry carbon abrasive and a hydrated mixture with 76 and 58% hard coal. Based on the conducted research, it was established that the effects of wear processes are associated with damage typical of wear mechanisms: micro-scratching and micro-fatigue. For the wear variant in the presence of dry coal abrasive, individual scratches caused by the abrasive grains were observed on the surface of the samples. The main reason for this type of damage was the aggregation of quartz, which is one of the basic components of the mineral substance present in the tested hard coal. When hydrated carbon mixtures were used as an abrasive, the surface of the samples also displayed scratches characteristic of the aggregate quartz. A small part of the carbon abrasive was pressed into the scratches. Under the influence of the wear caused by friction, small depressions were also formed, where coal penetrated. The effect of coal pressing into micro-scratches is related to its plastic properties. Tests of the abrasive conducted after the conclusion of wear tests have shown that under the influence of the local increase in temperature and pressure, the hard coal contained in the abrasive can undergo transformations. In the abrasive transformed under friction, small, but measurable changes in the content of the C element in relation to the initial hard coal sample were exhibited.
    W artykule poruszono problematykę związaną z procesami tribologicznymi zachodzącymi w wyniku nadmiernego zużycia powierzchni elementów przenośników zgrzebłowych wywołanych oddziaływaniem urobku powstającego w trakcie drążenia korytarzowych wyrobisk udostępniających lub eksploatacji węgla. Jednym z najczęściej spotykanych rodzajów zużycia tribologicznego jest zużycie ścierne. Testy zużyciowe przeprowadzono dla ścierniwa bazującego na węglu kamiennym, stosując suche ścierniwo węglowe oraz uwodnioną mieszaninę z udziałem 76 oraz 58% węgla. Stwierdzono, że efekty procesów zużyciowych związane są z uszkodzeniami typowymi dla mechanizmów zużycia: mikrorysowania i mikrozmęczenia. Dla wariantu zużycia w obecności suchego ścierniwa węglowego na powierzchni próbek zaobserwowano pojedyncze rysy wywołane działaniem ziaren ścierniwa. Główną przyczyną tego typu uszkodzeń była agregacja kwarcu, stanowiącego jeden z podstawowych składników substancji mineralnej występującej w badanym węglu kamiennym. W przypadku zastosowania jako ścierniwa uwodnionych mieszanin węgla, na powierzchni próbek również wytworzyły się charakterystyczne dla oddziaływania zagregowanego kwarcu rysy, w które wprasowywała się niewielka część ścierniwa węglowego. Pod wpływem zużycia wywołanego tarciem powstały również niewielkie wgłębienia, w które przedostał się węgiel. Efekt wprasowywania się węgla w mikrorysy związany jest z jego własnościami plastycznymi. Badania ścierniwa po zakończeniu testów zużyciowych wykazały, że pod wpływem lokalnego wzrostu temperatury i ciśnienia zawarty w ścierniwie węgiel kamienny może ulec przeobrażeniom. W ścierniwie przeobrażonym pod wpływem tarcia wykazano niewielkie, ale mierzalne zmiany zawartości pierwiastka C w stosunku do próbki wyjściowej węgla.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2020, 36, 3; 185-202
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of the health risk associated with exposure to heavy metals present in particulate matter deposition in the Małopolska Province
    Autorzy:
    Wieczorek, Jerzy
    Baran, Agnieszka
    Pawlik, Ewa
    Mądro, Izabela
    Gąsienica, Anna
    Wojtaszek, Iwona
    Antonkiewicz, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1841750.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    air pollution
    particulate matter deposition
    heavy metals
    health risk assessment
    Opis:
    The aim of the study was to investigate the content of trace elements in deposited particulate matter and to estimate the health risk to Kraków inhabitants, caused by the exposure to heavy metals in particulate matter deposition. The qualitative and quantitative assessments of selected heavy metals in deposited particulate matter have been carried out in the city of Kraków (Małopolska, southern Poland, 5 measuring points) for seven months, between February and September 2017. A comparative study was conducted at the same time in Małopolska (5 measuring points). The deposited particulate matter was collected gravitationally, using measurement plates covered with aluminum foil and paraffin jelly. The largest deposition of particulate matter was found in May and June. The highest amount of deposited particulate matter and metals present in it was determined in Kraków. The Hazard Quotient (HQ) evaluation for non-carcinogenic effect showed low risk for each metal. In the case of lead in particulate matter, the carcinogenic risk value did not reach 10−6 hence this risk is acceptable. The total carcinogenic risk for all routes of exposure to cadmium was higher, indicating the risk of cancer in children and adults, with children more exposed. However, the carcinogenic risk for cadmium was also acceptable. The study showed that the problem of poor air quality concerns not only the city of Kraków, but also the entire Małopolska region. Elevated metal concentrations in particulate matter indicate the need for monitoring it in the air.
    Źródło:
    Geology, Geophysics and Environment; 2021, 47, 2; 95-107
    2299-8004
    2353-0790
    Pojawia się w:
    Geology, Geophysics and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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