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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:
Biodegradacja związków fosfonowych przez grzyby
Biodegradation of phosphonates by fungi
Autorzy:
Wieczorek, Dorota
Lipok, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/172438.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
związki fosfonowe
biotransformacja
biodegradacja
grzyby
phosphonates
biotransformation
biodegradation
fungi
Opis:
Phosphonates are the group of organophosphorus compounds, which are characterized by the presence of covalent bond(s) between carbon and phosphorus atom in their structure. Both; the natural and synthetic phosphonic compounds, are encountered in various ecosystems, however because of their wide range of applications, the latter ones are considerably more frequently discussed. Regarding the broad spectrum of biological activity, capability to chelate metal cations and environmental stability of direct carbon to phosphorus bond under physiological conditions, phosphonic compounds found a variety of applications e.g. as pesticides, drugs, anticorrosive agents, additives to surfactants and flame resistant (partially)polymers. Such massive use of phosphonates, together with mentioned environmental stability of those compounds, results in their common presence as xenobiotic environmental pollutants. Scientific efforts dedicated to recognising the fate and biodegradation of phosphonic compounds in the environment had begun in 80’s last century. Currently it is known that many microorganisms, mainly bacteria, but also fungi, are able to decompose the C-P bond. Interestingly however, the number of known species of fungi that are able to biodegrade and/or to bio-transform the phosphonates, is relatively low. It seems to be surprising, because especially the fungi are known from their impressive skills to adaptation to various nutritional conditions. Such a thesis may be supported by the fact that the process of biodegradation of phosphonates may occur via several pathways. Enzymes which are known to catalyse this process are phosphonoacetaldehyde hydrolase, phosphonoacetate hydrolase, phosphonopyruvate hydrolase and C-P lyase complex. This article briefly presents the issue of degradation pathways of phosphonates, and the role of phosphonate- degrading fungi.
Źródło:
Wiadomości Chemiczne; 2020, 74, 1-2; 33-55
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Choroby odzwierzęce u ludzi oraz bakteryjne czynniki etiologiczne zoonoz występujące u zwierząt i w żywności w krajach Unii Europejskiej w 2018 r.
Zoonoses and zoonotic bacterial agents presence in animals and in food in EU member states in 2018
Autorzy:
Osek, Jacek
Wieczorek, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/21992760.pdf
Data publikacji:
2020
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
zoonozy
kampylobakterioza
salmoneloza
jersynioza
listerioza
goraczka Q
tularemia
bruceloza
zanieczyszczenia bakteryjne
Unia Europejska
Europejskie Centrum ds. Zapobiegania i Kontroli Chorób
raporty
rok 2018
choroby odzwierzęce
czynniki chorobotwórcze
żywność
Europejski Urząd ds. Bezpieczeństwa Żywności
zoonoses
bacterial agents
food
EFSA
ECDC
European Union
2018 Report
Opis:
In December 2019, the European Food Safety Authority (EFSA), and the European Centre for Disease Prevention and Control (ECDC), published the yearly report on the trends and sources of zoonoses and zoonotic agents in the European Union (EU) in 2018. Campylobacteriosis was the most frequently reported zoonotic disease in the EU, with 246.571 laboratory confirmed cases (including 719 in Poland), which means the same number as in 2017. Poultry meat still appears to be the most important food-borne source of Campylobacter spp. Salmonellosis was the second most frequently recorded zoonosis with 91.857 confirmed human cases (9064 in Poland), which was similar as in the 2017 report. Fresh poultry meat and products thereof followed by fresh pig meat were reported as major sources of Salmonella spp. On the other hand, the prevalence of salmonellae in breeding hens, laying hens, broilers and fattening turkeys decreased, in recent years. VTEC infections in humans were the third, most often reported zoonotic disease in the EU, with a total of 8161 confirmed cases (5 in Poland), which was significantly more than in 2017 (6073 patients). Yersiniosis was diagnosed in 7204 people (170 in Poland), which means the increase as compared to 2017 (6823 cases). The number of cases of listeriosis in humans increased to 2549, including 128 in Poland and among them, in the EU, 229 patients died (56 in our country). The number of Q fever and Francisella tularensis infection cases were 789 and 300, respectively (0 and 16 Poland), whereas the number of Brucella spp. and Mycobacterium bovis infections was 358 and 170, respectively (no cases in Poland).
Źródło:
Życie Weterynaryjne; 2020, 95, 03; 160-165
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bakteryjne choroby odzwierzęce u ludzi oraz ich czynniki etiologiczne u zwierząt i w żywności w krajach Unii Europejskiej w 2019 r.
Bacterial zoonoses and their etiological agents in animals and in food in EU members in 2019
Autorzy:
Osek, Jacek
Wieczorek, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/22180986.pdf
Data publikacji:
2021
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
bakterie
choroby bakteryjne
kampylobakterioza
salmoneloza
jersynioza
Escherichia coli
szczepy werotoksyczne
listerioza
bruceloza
tularemia
etiologia
Europejskie Centrum ds. Zapobiegania i Kontroli Chorób
Unia Europejska
zwierzęta
żywność
choroby człowieka
choroby odzwierzęce
gorączka Q
gruźlica
występowanie
Europejski Urząd ds. Bezpieczeństwa Żywności
zoonoses
bacteria
animals
humans
food
EFSA
ECDC
2019
European Union
Opis:
As in previous years, the European Food Safety Authority (EFSA), and the European Centre for Disease Prevention and Control (ECDC), published Report on the monitoring of zoonoses and zoonotic agents in the European Union (EU), in 2019. Campylobacteriosis still remains the first, most reported zoonotic disease in humans, in the EU, with 220,682 laboratory confirmed cases, including 715 in Poland. This means, that the trend for confirmed human cases of this disease was stable during years 2015–2019. Poultry meat is probably the most important source of food-borne Campylobacter. Salmonellosis was the second, most commonly recorded zoonosis with 87,923 confirmed human cases (8,373 in Poland), which is was at the a slightly lower level when compared to 2018. Salmonella was identified mainly in fresh poultry meat and products thereof. VTEC infections in humans, with regard to frequency, were the third reported zoonosis in the EU, with a total of 7,775 confirmed infections (14 in Poland), which was less than in the previous year (8,161 cases). Yersiniosis was identified in 7,048 people (196 in Poland), which was slightly less as compared to the previous data (7,204 cases). The number of listeriosis cases moderately increased to 2,621, including 121 people in Poland. However, the mortality rate was high and in the EU 300 persons have died, including 54 in our country. On the other hand, Listeria monocytogenes rarely exceeded the EU food safety limits in ready-to-eat food. The number of Francisella tularensis infections and Q fever cases were 1,280 and 950, respectively. For the first time since 2014, Q fever was identified in Poland (4 cases). Then, in 2019, Brucella and Mycobacterium bovis or M. caprae infected people were identified as 310 and 147 (two and 0 in Poland), respectively. This article aims at the presentation of the Report findings.
Źródło:
Życie Weterynaryjne; 2021, 96, 07; 510-516
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Choroby odzwierzęce u ludzi przenoszone drogą pokarmową oraz ich bakteryjne czynniki etiologiczne u zwierząt i w żywności w krajach Unii Europejskiej w 2020 r.
Food-borne bacterial zoonoses and their etiological agents in animals and in food in the European Union Member States in 2020
Autorzy:
Osek, Jacek
Wieczorek, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/22333108.pdf
Data publikacji:
2022
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
choroby bakteryjne
czynniki etiologiczne
kampylobakterioza
salmoneloza
jersynioza
Escherichia coli
szczepy werotoksyczne
listerioza
tularemia
bruceloza
Unia Europejska
rok 2020
Europejskie Centrum ds. Zapobiegania i Kontroli Chorób
choroby odzwierzęce
zwierzęta
żywność
choroby przenoszone drogą pokarmową
bakterie chorobotwórcze
gorączka Q
gruźlica
występowanie
Europejski Urząd ds. Bezpieczeństwa Żywności
zoonoses
bacteria
animals
humans
food
EFSA
ECDC
2020
European Union
Opis:
In November 2021, the European Food Safety Authority (EFSA) and the European Centre for Disease Prevention and Control (ECDC), published the recent report on the monitoring of zoonoses and zoonotic agents in the European Union (EU), in 2020. The number of cases was usually much lower than in 2019, mainly due to lack of the United Kingdom data (non-EU Member State since January 31, 2020). Campylobacteriosis was still the first most reported zoonotic disease in the EU with 120,946 laboratory confirmed cases, including 414 in Poland. Poultry meat is probably still the most important food-borne source of Campylobacter due to remained a high level of these bacteria. Salmonellosis was the second most commonly recorded zoonosis with 52,702 confirmed human cases (5,205 in Poland), and Salmonella was mainly identified in fresh poultry meat and products thereof. In 2020, yersiniosis was the third on the list of reported zoonoses in EU, with a total of 7,048 cases (87 in Poland). VTEC infections in humans were identified in 4,446 people in the EU (only three cases in Poland), whereas the number of listeriosis cases was 1,876, including 62 people in Poland. However, the mortality was still high, since 167 (almost 9%), patients have died. The number of Francisella tularensis infections and Q fever cases were 641 and 523, respectively, which were much lower than in the previous year. Brucella and Mycobacterium bovis or M. caprae infected people identified in 2020 were 128 and 88 (none in Poland), respectively.
Źródło:
Życie Weterynaryjne; 2022, 97, 03; 157-164
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprzedaż substancji przeciwbakteryjnych stosowanych w medycynie weterynaryjnej w krajach europejskich w 2020 r.
Sales of antimicrobial agents used in veterinary medicine in European countries in 2020
Autorzy:
Osek, Jacek
Wieczorek, Kinga
Powiązania:
https://bibliotekanauki.pl/articles/22351638.pdf
Data publikacji:
2022
Wydawca:
Krajowa Izba Lekarsko-Weterynaryjna
Tematy:
Europa
kraje europejskie
substancje przeciwbakteryjne
leki przeciwbakteryjne
handel
raport
rok 2020
weterynaria
sprzedaż
Europejska Agencja Leków
antimicrobials sale
veterinary medicine
food-producing animals
EMA report 2021
Polska
Opis:
At the end of 2021, the European Medicines Agency (EMA), published the 11th report on sales of antimicrobial agents used in veterinary medicine in 31 European countries in years 2019 and 2020. A total of 5,577.8 tons were sold in 2020 for animal treatment, including 5,507.7 tons used for food production animals, which was 5.6% more as compared to 2019. In Poland, 856.7 tons were sold, making 15.4% of total European antimicrobials consumption. EMA has developed a unit of measurement to monitor antibiotic use and sales across Europe as mg/PCU, where PCU means Population Correction Unit, and takes into account the animal population as well as the estimated weight of each particular animal at the time of treatment with antibiotics. Differences of sales of various antimicrobial classes between the countries (mean is 89.0 mg/PCU) in Europe was observed, from 2.3 mg/PCU in Norway to 393.9 mg/PCU in Cyprus (187.9 mg/PCU in Poland). These values show that between 2020 and 2021 in Europe and in Poland antibiotics use has increased 5.9% and 1.9%, respectively The largest proportions of the sold antimicrobials were accounted for penicillins (31.1%; 27.7 mg/PCU), tetracyclines (26.7%; 23.8 mg/PCU), and sulfonamides (8.8%; 6.4 mg/PCU). For the antimicrobials classes from the list of critically important antibiotics with highest priority in human medicine, namely 3rd and 4th generation of cephalosporins, fluoroquinolones, other quinolones, and polymyxins, the sales for food-producing animals accounted for 0,2%, 2.6%, 0.2%, and 2.8%, of the total sales in the 31 countries in 2020, respectively. In Poland, the highest consumption of antimicrobials were noted for penicillins (61.1 mg/PCU), tetracyclines (45.3 mg/ PCU), and macrolides (24.8 mg/PCU). For the period 2011–2020, an overall decline in sales of 43.2% was observed, from 161.4 mg/PCU in 2011 to 91.6 mg/PCU in 2020. During this period, sales decreased by more than 5% in 19 countries, whereas in four others sales increased by more than 5%, including Poland, where a total increase from 126.3 mg/PCU in 2011 to 197.9 mg/PCU in 2020 was noted. This article presents EMA report with critical comments and remarks.
Źródło:
Życie Weterynaryjne; 2022, 97, 04; 265-267
0137-6810
Pojawia się w:
Życie Weterynaryjne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd obszarów badawczych prezentowanych w Studiach Prawno-Ekonomicznych w latach 1968–2019
Overview of research areas presented in Studies in Law and Economics in 1968–2019
Autorzy:
Gad, Jacek
Wieczorek, Agata
Powiązania:
https://bibliotekanauki.pl/articles/1057752.pdf
Data publikacji:
2020-12-28
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
studies in law and economics
research areas
scientific disciplines
economic sciences
studia prawno-ekonomiczne
obszary badawcze
dyscypliny naukowe
nauki ekonomiczne
Opis:
Przedmiot badań: W artykule dokonano analizy obszarów badań podejmowanych przez naukowców publikujących swoje artykuły w części ekonomicznej czasopisma Studia Prawno-Ekonomiczne. Analizie poddano wszystkie numery czasopisma, które funkcjonuje ponad 50 lat. Cel badawczy: Celem głównym artykułu jest zidentyfikowanie obszarów badawczych prezentowanych w części ekonomicznej czasopisma Studia Prawno-Ekonomiczne. W artykule dokonano przyporządkowania zidentyfikowanych obszarów badawczych do trzech dyscyplin naukowych, tj. ekonomii, finansów oraz nauk o zarządzaniu. W artykule uwzględniono artykuły opublikowane w Studiach Prawno-Ekonomicznych w całym okresie funkcjonowania czasopisma, tj. w latach 1968–2019. 1 Metoda badawcza: Treści przedstawione w artykule sformułowano na podstawie studiów literaturowych oraz analizy 832 artykułów opublikowanych w Studiach Prawno-Ekonomicznych. Szeroka formuła czasopisma oraz dostęp do tak dużej bazy artykułów pozwoliły na prześledzenie, jak na przestrzeni ostatnich 50 lat zmieniała się „polska myśl ekonomiczna”. Wyniki: Wyniki badań wskazują, że naukowcy najczęściej publikowali w Studiach Prawno-Ekonomicznych artykuły dotyczące ekonomii. Począwszy od lat dziewięćdziesiątych coraz więcej publikacji dotyczy nauk o zarządzaniu oraz finansów. Obszary badawcze podejmowane przez naukowców zmieniają się w zależności od sytuacji gospodarczo-politycznej Polski, Europy czy świata. Wyniki badań wskazują, że na przestrzeni analizowanych lat nastąpiła dywersyfikacja wybieranych przez autorów obszarów badawczych we wszystkich trzech przywołanych w artykule dyscyplinach. Obszarem badawczym, który w ostatnich latach jest przedmiotem szczególnego zainteresowania naukowców publikujących swoje teksty w Studiach Prawno-Ekonomicznych, jest nadzór korporacyjny. Co ważne, obszar ten podejmowany jest przez naukowców reprezentujących zarówno ekonomię, finanse, jak i nauki o zarządzaniu.
Background: The article analyzes the research areas undertaken by scientists publishing their articles in the economic part of the journal Studies in Law and Economics. All issues of the journal, which have been published for over 50 years, have been analyzed. Research purpose: The main goal of the article is to identify research areas presented in the economic part of the journal Studies in Law and Economics. This article assigns the identified research areas to three scientific disciplines: economics, finance and the management sciences. This paper includes articles published in Studies in Law and Economics throughout the period of the journal’s operation, i.e. in the years 1968–2019. Methods: The content presented in the paper is based on literature studies and analysis of 832 articles published in Studies in Law and Economics. The broad scope of the journal and access to such a large database of articles allowed tracing how the “Polish economic thought” has changed over the past 50 years. Conclusions: Research results indicate that scientists most often published articles on economics in Studies in Law and Economics. Beginning in the nineties, more and more publications concern management and finance sciences. The research areas undertaken by scientists change depending on the economic and political situation of Poland, Europe, or the world. The research results indicate that over the analyzed years there has been a diversification of research areas selected by the authors in all three disciplines cited in the article. Corporate governance is a research area that has become of particular interest to authors publishing in Law and Economics in recent years. Importantly, corporate governance research has been undertaken by scientists representing economics, finance, and management sciences.
Źródło:
Studia Prawno-Ekonomiczne; 2020, 117; 203-222
0081-6841
Pojawia się w:
Studia Prawno-Ekonomiczne
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oznaczanie związków fosforu w matrycach roślinnych
Determination of phosphorus compounds in plant tissues
Autorzy:
Żyszka-Haberecht, Beata
Wieczorek, Dorota
Lipok, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1413210.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Chemiczne
Tematy:
fosfor
tkanki roślinne
oznaczanie
metody analityczne
NMR
phosphorus
plant tissues
determination
analytical methods
Opis:
The variety of the chemical forms of phosphorus compounds occurring in plant tissues, accompanied by the complexity of the chemical composition of plants as the analytical matrices, are the reasons why there is no one, the best answer, how those individual substances may be determined qualitatively and quantitatively. Interestingly, if the subject of determination is the total phosphorus content, the spectrum of effective methods and techniques seems to be impressive. However, in case of spectrophotometric measurements and classical variants of absorption (FAAS) or emission (ICP-AES/ ICP-OES) spectrometry techniques, it is necessary at first to isolate various phosphorus forms from the matrix, and then to mineralize them prior determination. The development of combined methods e.g. ETV-ICP- AES or HR-ETAAS, does allow the isolation of the phosphorus analyte and its detection in a kind of “one step” analytical procedure, directly in plant tissues. Similar benefits, while maintaining the sensitivity of determinations, are brought by the use of XRF, SIMS or nanoSIMS - more expensive techniques of imaging the presence of phosphorus in biological matrices. In turn, the application of nuclear magnetic resonance spectroscopy, especially the 31P NMR technique is thought to be the most universal approach. Using this technique and being aware of higher limit of detection, it is possible to determine various plant phosphorus compounds qualitatively and quantitatively, at the same time.
Źródło:
Wiadomości Chemiczne; 2021, 75, 7-8; 1017-1038
0043-5104
2300-0295
Pojawia się w:
Wiadomości Chemiczne
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
Tytuł:
Finansowanie świadczeń zdrowotnych w Polsce
Financing Of Health Services In Poland
Autorzy:
Wanot, Bartosz
Wilk, Małgorzata
Cichoń, Katarzyna
Morawska, Marzena
Turska, Dorota
Szczerba, Jolanta
Wieczorek, Anna
Wiatrowski, Jacek
Burunowa, Helena
Powiązania:
https://bibliotekanauki.pl/articles/476295.pdf
Data publikacji:
2018
Wydawca:
Wyższa Szkoła Ekonomiczno-Humanistyczna w Bielsku-Białej
Tematy:
finansowanie opieki zdrowotnej
NFZ
organizacja ZOZ
financing of health care
organization of the ZOZ
Opis:
Opieka zdrowotna jest niebywale istotnym, a jednocześnie bardzo trudnym elementem polityki społecznej państwa. Zarówno w Polsce, jak i w wielu innych krajach, kwestia źródeł i sposobu finansowania opieki zdrowotnej to ważny element efektywnej polityki państwa, a jednocześnie jeden z największych problemów społeczno-ekonomicznych. Jednostkami organizacyjnymi systemu finansowania opieki zdrowotnej w Polsce są przede wszystkim instytucje udzielające świadczeń zdrowotnych: Ministerstwo Zdrowia i Narodowy Fundusz Zdrowia. Źródłem finansowania polskiego systemu opieki zdrowotnej są: budżet państwa, ubezpieczenia zdrowotne (dobrowolne lub obowiązkowe) oraz środki własne pacjentów. W Polsce obowiązuje system obowiązkowego, powszechnego ubezpieczenia zdrowotnego.
Health care is an extremely important and at the same time very difficult element of the social policy of the state. Both in Poland and in many other countries, the issue of sources and ways of financing health care is an important element of effective state policy and at the same time one of the largest socio-economic problems. Organizational units of the health financing system in Poland are primarily health care institutions: the Ministry of Health and the National Health Fund. The source of funding for the Polish health care system is the state budget, health insurance (voluntary or compulsory) and patients’ own funds. In Poland, universal health insurance is compulsory.
Źródło:
MIND Journal; 2018, 6; 1-12
2451-4454
Pojawia się w:
MIND Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 19

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