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    Wyświetlanie 1-7 z 7
    Tytuł:
    Incidence of abnormalities in temporomandibular joints in a population of 1,100 urban and rural patients lacking teeth and other parafunctions in 2003-2008. An international problem
    Autorzy:
    Michalak, M.
    Paulo, M.
    Bozyk, A.
    Zadrozny, L.
    Wysokinska-Miszczuk, J.
    Michalak, I.
    Borowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/50352.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction and objective. A hectic lifestyle and everyday stress are direct causes of parafunctions. The objective of the presented study was to examine the relation of sleep disorders, distant pain symptoms, symptoms of pathological tooth wear in rural and urban patients with parafunctions. Materials and methods. The patient group consisted of 836 women and 274 men aged 9-82, and divided into groups taking into account the following criteria: number of patients in certain age groups, number of women and men, place of residence, presence of missing teeth problem, presence of occlusal and non-occlusal parafunctions, symptoms of tooth wear, distant pain symptoms, and sleep disorders. Results. 354 (31.89%) of the patients came from the rural environment. Distant pain symptoms were more frequent in patients performing parafunctions than in those who did not perform parafunctions (n = 1110, RR = 1.10, CI = from 1.04 to 1.16). Sleep disorders were more frequent in patients performing parafunctions than in those who do not perform parafunctions (n = 1110, RR = 1.06, CI = from 1.00 to 1.12). Symptoms of pathological tooth wear were more frequent in patients performing parafunctions than in those who did not perform parafunctions (n = 1110, RR = 1.08, CI = from 1.02 to 1.13). Conclusions. It is extremely important (as it is international problem) to introduce prophylactic care to prevent the occurrence of parafunctional activity in patients from the rural environment. Parafunctions, therefore, should be taken into account in the diagnosing procedure of such disorders and pathological symptoms as pathological tooth wear, sleep disorders, cervicalgia, neck myalgia, shoulder girdle myalgia, and dorsalgia.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2013, 20, 1
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern trade standards for steel raw materials
    Standardy handlowe współczesnych surowców stali
    Autorzy:
    Krzak, M.
    Paulo, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/215916.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
    Tematy:
    cena stali
    ruda żelaza
    koncentrat żelaza
    koks
    złom stalowy
    price of steel
    iron ore
    fruit concentrate
    coke
    steel scrap
    Opis:
    Steel and cast-iron products, due to their low price and beneficial properties, are the most widely used among metals; their consumption has become an indicator of the economic development of countries. The characteristics of iron raw materials, in relation to current metallurgical requirements, are presented in the present this article. The globalization of the trade and development of steelmaking technologies have caused significant changes in the quality of raw materials in the last half-century, forcing improvements in processing technologies. In many countries, standard concentrates (at least 60% Fe) are almost twice as rich as those processed in the mid-20th century. Methods of quality assessment have been improved and quality standards tightened. The quality requirements for the most important raw materials ‒ iron ores and concentrates, steel scrap, major alloy metals, coking coal, and coke, as well as gas and other energy media ‒ are reviewed in the present paper. Particular attention is paid to the quality testing methodology. The quality of many raw materials is evaluated multi-parametrically: both chemical and physical characteristics are important. Lower-quality parameters in raw materials equate to significantly lower prices obtained by suppliers in the market. The markets for these raw materials are diversified and governed by separate sets of newly introduced rules. Price benchmarks (e.g. for standard Australian metallurgical coal) or indices (for iron concentrates) apply. Some raw materials are quoted within the framework of the commodity market system (certain alloying components and steel scrap). The abandonment of the long-established system of multi-annual contracts has led to wide fluctuations in prices, which have reached a scale similar to that of other metals.
    Wyroby stalowe i żeliwne ze względu na niską cenę i korzystne właściwości znajdują najszersze zastosowanie wśród metali w gospodarce, a ich zużycie stało się wskaźnikiem rozwoju gospodarczego. W artykule przedstawiono charakterystykę surowców żelaza w odniesieniu do obecnych wymagań hutnictwa. Globalizacja handlu i rozwój technologii wytwarzania stali w ostatnim półwieczu spowodowały istotne zmiany w jakości wsadowych surowców mineralnych. Wymusiło to usprawnienie technologii przeróbczych przez zakłady górnicze. Przedmiotem światowego handlu są obecnie standardowe koncentraty o zawartości żelaza ponad 60%, tj. niemal dwukrotnie bogatsze niż rudy przetwarzane w połowie XX wieku w wielu krajach. Udoskonalone zostały sposoby oceny jakości surowców wsadowych i zaostrzono normy jakości. W publikacji dokonano przeglądu wymagań jakościowych najbardziej istotnych surowców: rud i koncentratów żelaza, złomu stalowego, głównych metali stopowych, węgla koksowego i koksu oraz gazu i innych nośników energii. Zwrócono szczególną uwagę na metodykę badania jakości surowców oraz standaryzację surowców wsadowych. Jakość surowców oceniana jest wieloparametrycznie; istotne są zarówno cechy chemiczne, jak i fizyczne. Gorsze parametry jakościowe surowców wsadowych skutkują niższymi cenami uzyskiwanymi przez dostawców w obrocie. Rynki tych surowców są zróżnicowane, kierowane odrębnymi i częściowo nowymi regułami. W obrocie handlowym funkcjonują standardy odniesień cenowych (np. ceny węgla metalurgicznego w Australii czy indeksy cenowe koncentratów żelaza). Część surowców kwotowana jest w systemie giełdowym (niektóre składniki stopowe i złom stalowy). Rezygnacja z powszechnych dawniej kontraktów wieloletnich doprowadziła do dużych wahań cen, które osiągnęły podobną skalę jak inne metale.
    Źródło:
    Gospodarka Surowcami Mineralnymi; 2018, 34, 4; 25-50
    0860-0953
    Pojawia się w:
    Gospodarka Surowcami Mineralnymi
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reuse of alum sludge for reducing flocculant addition in water treatment plants
    Autorzy:
    Scalize, Paulo S.
    Souza, Leonora M. D.
    Albuquerque, Antonio
    Powiązania:
    https://bibliotekanauki.pl/articles/207340.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    aluminum sulfate
    chemicals removal
    water treatment
    coagulation
    flocculation
    potable water
    sulfur compounds
    siarczan glinu
    usuwanie chemikaliów
    uzdatnianie wody
    koagulacja
    flokulacja
    woda pitna
    związki siarki
    Opis:
    The recycling of water treatment residues (WTR) inside drinking water treatment plants (DWTP) to be a good option for reusing this type of waste, as well as for reducing the costs with its disposal off and with the acquisition of treatment chemicals. Therefore, a WTR was reused for auxiliary of the coagulation-flocculation processes for reducing the use of aluminium sulfate (coagulant) in a DWTP. Three series of experiments have been conducted involving three water samples with different turbidity and colour, different WTR samples with different total suspended solids (TSS) concentrations and different aluminium sulfate concentrations. The results showed that WTR can efficiently be used for the removal of turbidity between 21 NTU and 218 NTU and colour between 194 HU and 1509 HU for TSS concentration between 1635 mg/dm3 and 5420 mg/dm3, with better results in the range between 1635 mg/dm3 and 2678 mg/dm3. For higher TSS concentrations, the removal of both parameters decrease because there are excess of organics released to water, which demands the use of more coagulant.
    Źródło:
    Environment Protection Engineering; 2019, 45, 1; 57-70
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-core and many-core SPMD parallel algorithms for construction of basins of attraction
    Autorzy:
    Silveira, Marcos
    Gonçalves, Paulo J.P.
    Balthazar, José M.
    Powiązania:
    https://bibliotekanauki.pl/articles/281668.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    basins of attraction
    MPI
    CUDA
    Duffing equation
    Sommerfeld effect
    mmunodynamics
    Opis:
    Construction of basins of attraction, used for the analysis of nonlinear dynamical systems which present multistability, are computationaly very expensive. Because of the long runtime needed, in many cases, the construction of basins does not have any practical use. Numerical time integration is currently the bottleneck of algorithms used for the construction of such basins. The integrations related to each set of initial conditions are independent of each other. The assignment of each integration to a separate thread seems very attractive, and parallel algorithms which use this approach to construct the basins are presented here. Two versions are considered, one for multi-core and another for many-core architectures, both based on a SPMD approach. The algorithm is tested on three systems, the classic nonlinear Duffing system, a non-ideal system exhibiting the Sommerfeld effect and an immunodynamic system. The results for all examples demonstrate the versatility of the proposed parallel algorithm, showing that the multi-core parallel algorithm using MPI has nearly an ideal speedup and efficiency.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1067-1079
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defining a storage-assignment strategy for precedence-constrained order picking
    Autorzy:
    Trindade, Maria A. M.
    Sousa, Paulo S. A.
    Moreira, Maria R. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2099652.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    storage location assignment problem
    SLAP
    correlated policy
    precedence constrains
    Opis:
    A zero-one quadratic assignment model has been proposed for dealing with the storage location assignment problem when there are weight constraints. Our analysis shows that operations can be improved using our model. When comparing the strategy currently used in a real-life company with the designed model, we found that the new placement of products allowed a reduction of up to 22% on the picking distance. This saving is higher than that achieved with the creation of density zones, a procedure commonly used to deal with weight constraints, according to the literature.
    Źródło:
    Operations Research and Decisions; 2021, 31, 2; 147--160
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seroprevalence of SARS-CoV-2 and assessment of epidemiologic determinants in Portuguese municipal workers
    Autorzy:
    Barros Ferreira, Nuno
    Pereira, Helena
    Pereira, Ana M.
    Azevedo, Luís F.
    Santos, Mariana
    Maranhão, Priscila
    Correia, Ricardo
    Fonseca, João A.
    Canedo, Paulo
    da Costa Pereira, Altamiro
    Sousa-Pinto, Bernardo
    Powiązania:
    https://bibliotekanauki.pl/articles/2084912.pdf
    Data publikacji:
    2022-06-08
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    SARS-CoV-2 infection
    COVID-19 pandemic
    COVID-19 virus
    COVID-19 serodiagnosis
    COVID-19 antibody testing
    SARS-CoV-2 infection serological testing
    Opis:
    ObjectivesTo assess the seroprevalence of SARS-CoV-2 antibodies in municipal employees of Northern Portugal during the first pandemic wave (May–June 2020) and its association with potentially related risk factors for infection.Material and MethodsThe authors assessed municipal employees of 2 cities in Northern Portugal, in whom serological tests to SARS-CoV-2 and an epidemiological survey were applied. The authors assessed the proportion of individuals presenting IgM and/or IgG antibodies to SARS-CoV-2, and evaluated the association between having positive serological test results, epidemiologic variables and clinical presentations. Reported symptoms were evaluated on their sensitivity, specificity, and predictive values.ResultsThe authors assessed 1696 employees, of whom 22.0% were firefighters, 10.4% were police officers, 10.3% were maintenance workers, and 8.1% were administrative assistants. The seroprevalence of SARS-CoV-2 infection was 2.9% (95% CI: 2.1–3.7%). Administrative assistants comprised the professional group with highest seroprevalence of SARS-CoV-2 (OR = 1.9 in the comparison with other occupational groups, 95% CI: 0.8–4.3, p = 0.126). The seroprevalence of SARS-CoV-2 infection among those who were in direct contact with COVID-19 patients in their professional activity was 3.9%, compared to 2.7% among those who were not in direct contact with such patients (OR = 1.5, 95% CI: 0.8–2.8, p = 0.222). The highest risk of infection was associated with the presence of a confirmed SARS-CoV-2 infection in the household (OR = 17.4, 95% CI: 8.3–36.8, p < 0.001). Living with a healthcare professional was not associated with a higher risk of infection (OR = 1.0, 95% CI: 0.4–2.5, p = 0.934). Anosmia/dysgeusia was the symptom with the highest positive predictive value (52.2%, 95% CI: 31.8–72.6, p < 0.001) and specificity (99.3%, 95% CI: 98.9–99.7, p < 0.001), while cough was the most prevalent symptom among SARS-CoV-2 seropositive participants (36%).ConclusionsThe authors observed a SARS-CoV-2 seroprevalence of 2.9% among assessed municipal employees. Anosmia/dysgeusia was the COVID-19 symptom which displayed the highest positive predictive value and specificity.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2022, 35, 3; 297-307
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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