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    Wyświetlanie 1-4 z 4
    Tytuł:
    Heterogeneous polymers degradation – microplastic
    Niejednorodna degradacja polimerów – mikroplastik
    Autorzy:
    Mucha, Maria
    Mucha, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/2202623.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Chemii Przemysłowej
    Tematy:
    thermos-oxidation
    semicrystalline polymers
    chain scission
    structure
    viscosity
    termooksydacja
    polimery częściowo krystaliczne
    pękanie łańcucha
    struktura
    lepkość
    Opis:
    The process of semicrystalline polymers thermo-oxidative degradation was analyzed on the example of isotactic polypropylene (iPP). Oxygen degradation takes place mainly in the amorphous phase into which oxygen diffuses. This leads to oxidation (formation of hydroperoxides) and next the chains scission. The polymer becomes brittle and breaks down into small pieces (e.g. microplastics). The crystalline phase is more difficult to access for oxygen that initiates the thermo-oxidation process. An increase in the crystallinity degree and a decrease in the viscosity of the solutions diluted in p-xylene as a function of the degradation time were observed. The number of iPP chain scission (change in molecular weight) as a function of degradation time was also calculated. These values depend on the polymer initial crystallinity degree and its supermolecular structure.
    Na przykładzie izotaktycznego polipropylenu (iPP) przeprowadzono analizę procesu termooksydacyjnej degradacji polimerów semikrystalicznych. Degradacja z udziałem tlenu obydwa się przede wszystkim w fazie amorficznej, do której dyfunduje tlen. Prowadzi to do utleniania (powstawania wodoronadtlenków), a następnie pękania łańcucha polimerowego. Polimer staje się kruchy i rozpada na małe fragmenty (m.in. mikroplastik). Faza krystaliczna jest trudniej dostępna dla tlenu inicjującego proces termoutleniania. Stwierdzono wzrost stopnia krystaliczności i zmniejszenie lepkości roztworów rozcieńczonych w p-ksylenie w funkcji czasu degradacji. Obliczono również liczbę pęknięć łańcucha iPP (zmianę masy cząsteczkowej) w funkcji czasu degradacji. Wielkości te zależą od początkowego stopnia krystaliczności polimeru i jego struktury nadcząsteczkowej.
    Źródło:
    Polimery; 2022, 67, 7-8; 293--297
    0032-2725
    Pojawia się w:
    Polimery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Variable-Intensity Running Training and Circuit Training on Selected Physiological Parameters of Soccer Players
    Autorzy:
    Ambroży, Tadeusz
    Nowak, Mateusz
    Omorczyk, Jarosław
    Wrześniewski, Krzysztof
    Ozimek, Mariusz
    Duda, Henryk
    Mucha, Dawid
    Ceranowicz, Piotr
    Pałka, Tomasz
    Stanula, Arkadiusz
    Mucha, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1030576.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
    Tematy:
    circuit training
    physiological parameters
    soccer players
    variable-intensity running training
    Opis:
    Proper planning of the training process based on individual LT and AT metabolic thresholds is essential to improve athletic performance. Development of endurance in soccer players is mainly based on continuous runs and variable-intensity runs, supplemented with strength conditioning and sport-specific training. The aim of the study was to analyse selected parameters of physical capacity of soccer players after 8-week variable-intensity running training and circuit training. The experiment was carried out in a group of 34 soccer players aged 21 to 26 years. The athletes were divided into two groups: 17 people in the experimental group and 17 people in the control group. The experimental group was involved in 30-minute tempo runs two times a week for 8 weeks with variable intensity at AT. In the same period, the control group performed two 60-minute continuous runs at the intensity of 70-75%HRmax. The determination of metabolic thresholds used two indirect tests: the multistage shuttle run test (beep test) and maximal lactate steady state test (MLSS) with author's own modification. In order to evaluate maximal heart rate (HRmax), the research procedure was started from the beep test (distance: 20 m). The speed at the first level was 8.5 km/h and increased with each level by 0.5 km/h. Training of the experimental group where variable exercise intensity was used caused a statistically significant increase in HRmax (by 1.9%) and blood lactate levels at the AT (by 20.5%). The training in the experimental group led to the statistically significant (p < 0.05) increase in the parameters of the following variables: HRmax (by 1.9%); lactate level (by 7.85); HR at the AT (by 1,9%); lactate level at the AT (by 20.5%). The assumptions of the experimental training did not cause statistically significant changes in pretest vs. posttest HRmax and blood lactate levels for the LT. Endurance training with high intensity is more effective in soccer players compared to training with moderate intensity. Development of special endurance in soccer should also assume the intensity and method of working similar to the method used during sport competition.
    Źródło:
    Central European Journal of Sport Sciences and Medicine; 2018, 23, 3; 25-35
    2300-9705
    2353-2807
    Pojawia się w:
    Central European Journal of Sport Sciences and Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Distribution of Minimal and Maximal Values of the Location of the Centre of Pressure in the Frontal and Sagittal Planes in Healthy Boys and Boys with Mild Intellectual Disability Participating in 12-Week Equestrian Classes
    Autorzy:
    Mazur-Rylska, Anna
    Ambroży, Tadeusz
    Mucha, Dariusz
    Omorczyk, Jarosław
    Ambroży, Dorota
    Mikuľáková, Wioletta
    Gulak, Stanisław
    Puszczałowska-Lizis, Ewa
    Kendrová, Lucia
    Mucha, Dawid
    Powiązania:
    https://bibliotekanauki.pl/articles/1836597.pdf
    Data publikacji:
    2017
    Wydawca:
    Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
    Tematy:
    stabilographic parameters
    balance
    horse riding
    mild intellectual disability
    correlation
    Opis:
    Humans maintain balance in the vertical position through random movements that result from instability of the body supported in two points. These tracking movements are responsible for the motor activity focused on maintaining body balance. The role of the postural control system is to choose a strategy, that is, the behaviour as a response to stimuli and regaining the balance through coordinated activity of the muscles that stabilize the talocrural and hip joints that perform movements in the frontal and sagittal planes. The aim of this study is to evaluate the effect of equestrian classes on postural balance in the frontal and sagittal balance in healthy boys aged 15 to 17 years and boys at the same age with mild intellectual disability. The study examined 100 randomized boys aged 15 to 17 years with mild intellectual disability and healthy boys. The study participants were divided into two groups: experimental group, who participated for 12 weeks in equestrian classes and the control group, with boys attending outdoor or indoor physical education classes. Before and after completion of the study, both experimental and control groups were diagnosed by means of Accu SwayPlus force plate. Maximum and minimum locations of the position of the centre of pressure (COP) with respect to the base of support on the platform were evaluated in the frontal and sagittal planes. The description of the parameters was based on the arithmetic mean, maximal and minimal value, scatter diagram and percentage distribution of values. Correlation of the parameters was also evaluated. Significant changes were found in the experimental groups after horse-riding classes, which pointed to the improvement in balance response, particularly in the sagittal plane, both in terms of minimal and maximal values. The character of these changes was similar: value of body sway in the sagittal plane was reduced and the higher percentage of minimal values was recorded for each parameter in both planes after the equestrian effect. Correlations were found between maximum position of the centre of pressure (COP) in the frontal plane and minimal and maximal position of the centre of pressure in the sagittal plane. All the significant changes and trends found for the experimental group which occurred after 12 weeks of equestrian classes suggest improved parameters of balance. The lack of changes in balance parameters in the control group shows that the equestrian classes help develop balance abilities in healthy boys aged 15 to 17 years and, to a lesser extent, in those with mild intellectual disability.
    Źródło:
    Security Dimensions; 2017, 21(21); 86-116
    2353-7000
    Pojawia się w:
    Security Dimensions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Proposal for Special Kickboxing Fitness Test
    Autorzy:
    Ambroży, Tadeusz
    Omorczyk, Jarosław
    Stanula, Arkadiusz
    Kwiatkowski, Amadeusz
    Błach, Wiesław
    Mucha, Dariusz
    Kędra, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1836645.pdf
    Data publikacji:
    2016
    Wydawca:
    Wyższa Szkoła Bezpieczeństwa Publicznego i Indywidualnego Apeiron w Krakowie
    Tematy:
    Special fitness
    kickboxing
    fitness tests
    Opis:
    The aim of this study is to evaluate validity and reliability of a new special kickboxing fitness test. The test can be also useful in such combat sports as karate, taekwondo, ju-jitsu and MMA. The study group was 25 elite level athletes from the KS Gladiator club in Grybów. The test was repeated in the same group for three times. In order to evaluate test reliability, test results were compared to the results obtained by study participants in two special fitness tests proposed by Sterkowicz1 . The statistical analysis of the results was also performed. The analysis of the results presented in this study shows that the specific character of the movements typical of the kickboxing fight justifies the introduction of the tests based on kicks and punches to the test battery that evaluates special fitness. Furthermore, the new special fitness test proposed in this study can be used for selection and interpretation of the achievements of kickboxers since it offers a reliable, valid and user-friendly research tool.
    Źródło:
    Security Dimensions; 2016, 20(20); 96-110
    2353-7000
    Pojawia się w:
    Security Dimensions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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