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    Wyświetlanie 1-6 z 6
    Tytuł:
    Analysis of the possibilities of using composite structural c-channels as lining for an arch support in mining excavation
    Autorzy:
    Rotkegel, Marek
    Korol, Jerzy
    Sobczak, Dagmara
    Powiązania:
    https://bibliotekanauki.pl/articles/2073872.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wyrobisko chodnikowe
    profil konstrukcyjny
    bezpieczeństwo górnicze
    górnicza obudowa powłokowa
    research
    lining
    arch support
    composite c-channels
    Opis:
    The article is the result of a project aimed at developing and implementing a design of composite accessories for support in excavations located in underground hard coal mines. The research team verified the possibility of using elements made of prefabricated composite structural profile as an alternative to steel and reinforced concrete lining elements used to improve support’s stability and protect against rockfall. This paper includes a research experiment on the possibilities of using a composite C-profile element as lining made in the pultrusion technology with a longitudinal position of the roving. The prefabricated structural profiles were adapted to the function by designing seatings for fitting the flanges for arch support’s V-profiles. Prototypes of these elements were subjected to bench tests in compliance with the guidelines for testing mesh linings. In addition, computer simulations using the finite element method were carried out. The values obtained during the tests were compared with the requirements for lightweight mesh and included the Polish standard PN-G-15050 and reinforced A-type concrete lining defined in the standard PN-G-06021. The team determined the areas where material strength exceeded and the structure was damaged. Despite the limited quantity of laboratory tests and lack of field tests in actual mining conditions, it was possible to address the argument of the research and determine whether it is possible to use C-profile made in the pultrusion technology as a lining element.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 3; 437--455
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer simulation of heating properties in wall partition with built-in elements that imitate thermal bridges
    Autorzy:
    Tokarski, Daniel
    Żukiewicz-Sobczak, Wioletta
    Chodyka, Marta
    Grudniewski, Tomasz
    Nitychoruk, Jerzy Antoni
    Tomaszewski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/2065742.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    2D modelling
    thermal permeability
    thermal flows
    point and linear thermal bridges
    modelowanie 2D
    przenikalność cieplna
    właściwości termiczne
    ściana działowa
    symulacja komputerowa
    Opis:
    The article aimed at presenting of the design assumptions of the wall partition built anda results of computer simulation of thermal properties in a heterogeneous wall partition in THERM. Display of the isotherms' distribution, heat flux vectors and temperature distribution in the area of thermal bridges and beyond. The tested partition on the basis of which simulations were created, was equipped with elements imitating thermal bridges, used in construction, to show their influence on the thermal properties of building structures. Thermal bridges can take the form of linear and point bridges. The example described in the article concerns the problem of thermal bridges occurring in wall partitions. The simulation is a preliminary pilot action before the start of non-invasive tests, ie measurement and calculation of the heat transfer coefficient, thermovision measurements on the surface of the barrier.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 37--44
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer simulation of heating properties in wall partition with built-in elements that imitate thermal bridges
    Autorzy:
    Tokarski, Daniel
    Żukiewicz-Sobczak, Wioletta
    Chodyka, Marta
    Grudniewski, Tomasz
    Nitychoruk, Jerzy Antoni
    Tomaszewski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/104321.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    2D modelling
    thermal permeability
    thermal flows
    point and linear thermal bridges
    modelowanie 2D
    przenikalność cieplna
    właściwości termiczne
    ściana działowa
    symulacja komputerowa
    Opis:
    The article aimed at presenting of the design assumptions of the wall partition built anda results of computer simulation of thermal properties in a heterogeneous wall partition in THERM. Display of the isotherms' distribution, heat flux vectors and temperature distribution in the area of thermal bridges and beyond. The tested partition on the basis of which simulations were created, was equipped with elements imitating thermal bridges, used in construction, to show their influence on the thermal properties of building structures. Thermal bridges can take the form of linear and point bridges. The example described in the article concerns the problem of thermal bridges occurring in wall partitions. The simulation is a preliminary pilot action before the start of non-invasive tests, ie measurement and calculation of the heat transfer coefficient, thermovision measurements on the surface of the barrier.
    Źródło:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury; 2019, 66, 1; 37-44
    2300-5130
    2300-8903
    Pojawia się w:
    Czasopismo Inżynierii Lądowej, Środowiska i Architektury
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Authors’ response (December 7, 2017) to the letter to the Editor concerning the paper “Trends in smoking among secondary school and high school students in Poland, 2009 and 2011”
    Autorzy:
    Wojtyła-Buciora, Paulina
    Stawińska-Witoszyńska, Barbara
    Żukiewicz-Sobczak, Wiola
    Wojtyła, Cezary
    Biliński, Piotr
    Urbaniak, Monika
    Wojtyła, Andrzej
    Marcinkowski, Jerzy T.
    Wojciechowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2160042.pdf
    Data publikacji:
    2018-07-04
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    health education
    cigarette smoking
    tobacco epidemiology
    smoking initiation
    secondary school students
    high school students
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2018, 31, 4; 541-542
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Trends in smoking among secondary school and high school students in Poland, 2009 and 2011
    Autorzy:
    Wojtyła-Buciora, Paulina
    Stawińska-Witoszyńska, Barbara
    Żukiewicz-Sobczak, Wiola
    Wojtyła, Cezary
    Biliński, Piotr
    Urbaniak, Monika
    Wojtyła, Andrzej
    Marcinkowski, Jerzy T.
    Wojciechowska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2161891.pdf
    Data publikacji:
    2017-07-14
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    health education
    cigarette smoking
    high school students
    tobacco epidemiology
    smoking initation
    secondary school students
    Opis:
    Objectives To determine the age and the most common circumstances for smoking initiation along with smoking rates and to evaluate smoking trends for secondary and high school students in Poland during 2009 and 2011. Material and Methods In 2009, a pilot study was conducted in districts of Poland on high school students and their parents. For statistical analysis, correctly completed questionnaires from 999 students and 667 parents were qualified for use. After the pilot study, a nationwide study of secondary school students and their parents was also conducted in 2009. For statistical analysis, correctly completed questionnaires were used from 9360 students and 6951 from their parents. The research tool was a questionnaire developed by the Chief Sanitary Inspectorate. These studies were then compared to the nationwide research study from 2011. Questionnaires were obtained from a survey of 3548 students from secondary schools and 4423 of those from high schools. Results Smoking initiation usually begins at ages 12–15 years. Rates of secondary school student smoking at least once in their lifetime were about the same level in the surveyed years (2009 – 9%, 2011 – 11%), whereas rates of high school student smoking increased (2009 – 15%, 2011 – 24%). Moreover, 34% of secondary school student smoked less than once a week, whereas in 2009, only 8% of students had done so. For high school students, a 1/2 smoked every day; similar to 2009. Students usually smoked in parks, on streets or any other open space areas. Conclusions From analyzing the smoking trends over the survey period it can be concluded that the problem of smoking increases with respondent age. Int J Occup Med Environ Health 2017;30(5):763–773
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2017, 30, 5; 763-773
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Longevity of Polish top-class athletes compared to other social elites and well-known people in the years 2001–2021
    Autorzy:
    Śmigielski, Witold
    Małek, Łukasz
    Kwaśniewska, Magdalena
    Gajda, Robert
    Pawlak-Sobczak, Katarzyna
    Korczak, Karol
    Cicha-Mikołajczyk, Alicja
    Piwońska, Aleksandra
    Piwoński, Jerzy
    Śmigielski, Janusz
    Drygas, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/45907870.pdf
    Data publikacji:
    2024-09-10
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    Polska
    lifespan
    athletes
    longevity
    premature mortality
    elites
    Opis:
    Objectives The aim of this work is to initiate or revive a scientific discussion on the impact of professional life on the parameters of human lifespan. Material and Methods Presented analysis is based on 8578 Polish elite or well-known person who died in 2001–2021. Results The results of the conducted analysis indicate that in the case of men the highest values of the median age at death were characteristic of freelancers (median [Me] ± quartile deviation [QD] 85.5±8.5 years), followed by scientists and academic teachers of the biological and medical specialty (Me±QD 84.0±7.5 years) and officers of power structures (Me±QD 83.5±8.5 years). Subsequently, the highest value of the median age at death was recorded for social activists (Me±QD 83.0±9.5 years), clergy (Me±QD 82.0±7.5 years) and scientists and academic teachers of specialties other than biological and medical (Me±QD 82.0±8.0 years). Significantly, at the very end of this list are athletes (Me±QD 77.0±9.0 years). Nevertheless, the results of the analysis confirm that professional athletes are characterized by higher median age at death compared to the general population. Analysis made only within athletes group demonstrated that the parameters of lifespan of athletes of endurance disciplines (Me±QD 78.0±8.0 years) are the most favorable compared to athletes of other disciplines, in particular in compare to team sports athletes (Me±QD 75.0±10.0 years) or combat sports athletes (Me±QD 75.0±7.1 years). Conclusions What is new and innovative in this paper is comparing the lifespan characteristics of athletes in comparison to widely represented group of other professions with higher socio-economic status. Unexpectedly, the lifespan of athletes occurred to be lower than for fast all other analyzed occupational groups, except mainly of entertainment musicians. Finally, the results presented in this paper emphasize the need to analyze the lifespan characteristics of athletes in a broader scope than only in relation to the general population.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2024, 37, 3; 335-350
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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