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    Wyświetlanie 1-7 z 7
    Tytuł:
    Evaluation of discomfort glare in the 50+ elderly: experimental study
    Autorzy:
    Wolska, Agnieszka
    Sawicki, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/2178853.pdf
    Data publikacji:
    2014-06-21
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    lighting
    glare
    UGR
    50+ elderly
    asthenopia
    discomfort glare evaluation
    Opis:
    Objectives: The aim of the study was to analyze discomfort glare sensation in subjects aged 50 years and more in comparison with younger subjects (i.e. younger than 35 years of age). Material and Methods: The experiments were performed on a computer workstation placed in controlled lighting environment where 2 discomfort glare conditions were modeled. Each participant performed for about 1 h specially designed visual tasks, including the tests with Landolt's rings presented on the screen by a computer program. The glare evaluation method consisted of subjective evaluation of discomfort glare on the semantic glare rating scale, tests of mesopic contrast and glare sensitivity, subjective assessment of lighting quality and asthenopic symptoms. The time needed to perform the task and the number of mistakes were also recorded. The subjective evaluation of glare was compared with the Unified Glare Rating (UGR) index calculated by the DIALux simulation program. Results: A higher percentage of the younger group subjects assessed glare after the experimental session as uncomfortable and intolerable than in the 50+ group, who more often assessed glare as acceptable. The assessment of discomfort glare in the younger group corresponded to higher UGR value compared to UGR value calculated by DIALux. In the 50+ group, such correlation was found only for lower discomfort glare (UGR = 19). The results showed that younger participants more frequently suffered from visual fatigue and assessed lighting as less comfortable. However, the mesopic glare sensitivity increased significantly after the experiments only in the 50+ group under both glare conditions. Conclusions: The obtained results showed that discomfort glare sensation changes with age. The younger population seems to be more sensitive and demanding than the older one in relation to discomfort glare limiting, in spite of the lack of significant objective measures of fatigue. The exposure of the elderly to bigger discomfort glare could adversely affect the objective measures of fatigue like mesopic glare sensitivity and visual performance.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 3; 444-459
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Features of Aluminium Alloys 2024, 6061 and 7075 on the Properties of GLARE-Type Composites
    Wpływ właściwości stopów aluminium 2024, 6061, 7075 na cechy kompozytu typu GLARE
    Autorzy:
    Wilk, M. S.
    Śliwa, R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/355146.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GLARE composites
    aluminium alloy
    mixing rule
    kompozyty GLARE
    stopy aluminium
    reguły mieszania
    Opis:
    The above paper presents the assumptions and results of the research whose aim was to determine the influence of 2024, 6061 and 7075 aluminum alloys on the final properties of GLARE-type composites. GLARE 3 2/1 type composites, made of two layers of the epoxy prepreg, reinforced with unidirectional glass fibers, arranged in the direction of 0°/90°, and two sheets of aluminum with a thickness of 0.4 mm, were investigated. Composites of various stacking configurations of alloy layers, made of one type of aluminum alloy (so-called ‘homogeneous composites’), and two different alloys (mixed composites), were analyzed. The properties of the composites were evaluated with the use of the mixing rule and compared with the test results. The influence of the used aluminum alloys on mechanical properties of GLARE-type composites has been determined. GLARE-type composite made of 7075 alloy sheets had the most favorable mechanical properties in comparison to properties of composites with 2024 and 6061 sheets. It has been shown how the properties of GLARE-type composites depend on the type of the aluminum alloy. It has been also proved that the properties of GLARE-type composites can be evaluated with the use of the mixing rule.
    W pracy przedstawiono założenia i wyniki badań, których celem było określenie wpływu właściwości zastosowanych stopów aluminium 2024, 6061 i 7075 na własności finalne kompozytów typu GLARE. Analizie poddano kompozyty typu GLARE 3 2/1 wykonane z dwóch warstw prepregu epoksydowego, zbrojonego włóknem szklanym, ułożonego w kierunku 0°/90°, oraz z dwóch arkuszy stopu aluminium o grubości 0,4 mm. Przeanalizowano kompozyty o różnych konfiguracjach ułożenia warstw stopów, składające się z jednego gatunku stopu aluminium (tzw. kompozyty jednorodne), oraz z dwóch różnych stopów (kompozyty mieszane). Własności kompozytów oszacowano na podstawie reguły mieszania i porównano je z wynikami badań. Określono wpływ zastosowanego stopu aluminium na własności wytrzymałościowe kompozytów typu GLARE. Najkorzystniejsze własności wytrzymałościowe wykazał kompozyt z udziałem arkuszy stopu 7075 w stosunku do właściwości kompozytów z udziałem arkuszy blach stopów 2024 oraz 6061. Określono jak właściwości kompozytu typu GLARE zależą od rodzaju zastosowanego stopu aluminium. Wykazano również, że cechy kompozytów typu GLARE można oszacować na podstawie reguły mieszania.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 4; 3101-3108
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Method for evaluating discomfort glare based on the analysis of a digital image of an illuminated interior
    Autorzy:
    Błaszczak, U. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/220384.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    discomfort glare
    measurement
    lighting
    analysis
    Opis:
    The article proposes a method for measuring discomfort glare which uses numerical description of the phenomenon in the form of a digital luminance distribution map recorded on a CCD array. Essential procedures for determining partial quantities which are necessary for calculation of UGR index are discussed in detail, along with techniques for measuring position index and size of light sources, with regard to the parameters of the registering system and coordinates of the images of the sources on the array.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 4; 623-634
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Importance of cut - off line in automotive headlamps aiming
    Autorzy:
    Targosiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/246827.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    headlights aiming
    cut-off line
    road illumination
    glare protection
    Opis:
    The basic element of passing beam headlights is the "cut-off line". It was intended in European beam pattern as tool for correct adjustment of passing beam according good road illumination distance and oncoming drive eyes protection of excessive glare. Cut-off line was established on the one hand as a natural part separating bright and dark area in the conventional passing beam, on the other assigned its essential function of the visual aiming of headlights. It is used in laboratory practices as well as in vehicles factories and in services and technical periodical inspection. The most important is that cut-off line was defined visually and subjectively over 50 years ago. But needed aiming precision according guaranteed road visibility and glare protection is much higher than historically moulded practical cut-off performance. In paper is analysed definition of cut-off line, their performance and meaning, historical evolution and influence for technical development of headlamps design. Also, mathematical approximation and modelling of cut-off line visual perception is described. The important is analysis of practical examples of real cut-off lines, their connections with significant beam pattern characteristics and possible ambiguous aiming during type approval and during vehicle exploitation. Also, analyzed are perspectives of future cut-off line use, development or - may be replacement by other means better serving this very important task to guarantee correct adjustment beam pattern according good road illumination and protection against excessive glare.
    Źródło:
    Journal of KONES; 2012, 19, 3; 469-476
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Functional features and hygienic aspects of LED lamps
    Cechy użytkowe i aspekty higieniczne lamp ledowych (LED)
    Autorzy:
    Janosik, Elżbieta
    Marzec, Stanisław
    Marczak, Wojciech
    Nowicka, Jolanta
    Zachara, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/1177514.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    "Correlated Colour Temperature"
    "LED lamp"
    "blue light"
    "glare"
    "lighting conditions"
    Opis:
    Aim of the study: The aim of this study was to identify characteristics of the LED lamps and their influence on perceptual abilities and feeling of a human. Materials and methods: Technical parameters of ten chosen LED sources of light were determined. The sources varied among each other, according to the shape, colour temperature, colour rendering index and also name of the manufacturer. For each of the analysed sources of light, the illuminance, lighting uniformity, lighting luminance and degree of glare were determined. Moreover, also a subjective evaluation of the lighting conditions created by those lighting sources was performed. Results and conclusions: The study results have shown that the majority of the analysed sources of light provided their users with a good visibility and comfort of vision, but on the other hand, if used in an inappropriate way, they may be the reason for the unaccepted glare. It has been stated that the appropriate use and earlier – the well-thought-out choice of the LED sources of light are crucial. One has to consider the luminous flux, the colour temperature, the shape, as well as the manufacturer, who guarantees the quality and the safety class of the LED source of light.
    Cel badań: Celem badań było poznanie właściwości ledowych źródeł oświetleniowych i ich wpływu na możliwości percepcyjne człowieka oraz jego samopoczucie. Materiał i metodyka badań: Określono parametry techniczne dziesięciu, wybranych źródeł LED, różniących się między sobą kształtem, mocą, temperaturą barwową, wskaźnikiem oddawania barw, a nawet marką producenta. Dla każdego, badanego źródła wyznaczono natężenie oświetlenia, równomierność oświetlenia, luminancję świetlną oraz stopień olśnienia, a także dokonano subiektywnej oceny warunków oświetlenia, stwarzanych przez te źródła. Wyniki i wnioski: Wykazano, że większość z badanych źródeł LED zapewnia dobrą widoczność i wygodę widzenia, ale jednocześnie przy nieprawidłowym stosowaniu może być powodem nieakceptowalnego olśnienia. Stwierdzono, że bardzo istotne jest prawidłowe użytkowanie oraz wcześniej – przemyślany wybór źródła LED, biorący pod uwagę strumień świetlny, temperaturę barwową, kształt, a tak- że markę producenta, która gwarantuje jakość i klasę bezpieczeństwa źródła LED.
    Źródło:
    Medycyna Środowiskowa - Environmental Medicine; 2015, 18, 4; 15-22
    1505-7054
    2084-6312
    Pojawia się w:
    Medycyna Środowiskowa - Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital luminance photometry in the context of the human visual system
    Autorzy:
    Słomiński, Sebastian
    Powiązania:
    https://bibliotekanauki.pl/articles/2173705.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    human vision
    luminance distribution measurements
    glare
    lighting technology
    widzenie ludzkie
    pomiar rozkładu luminancji
    blask
    technologia oświetleniowa
    Opis:
    Almost all solutions in modern lighting systems are based on LED technology. Luminance and obvious ease of control are the key characteristics of this light source. At the same time, luminances at the level of 108 cd/m2 are a significant advantage of LED in design applications, where high luminous intensity amplification is important. However, in general and in road lighting applications, LED luminaires represent a source of potential discomfort glare. Unfortunately, lighting technology’s metrology lags behind LED parameter development and optimization. The results of luminance measurements of the same luminaires, made with a luminance camera and meters with a measuring field, differ. The differences even appear for the same imaging luminance measuring devices with different lenses. This article presents the results of experiments and detailed analyzes related to modern digital luminance photometry based on the use of digital image sensors. Luminance tests were conducted on multi-source research models of luminaires. Traditional luminance measuring equipment with a measuring field was used in the experiment. The research was also supplemented with the measurements made using CCD/CMOS luminance cameras with selected components where the angular field of view of each pixel was a 0.45 min arc corresponding to the highest average human sight parameters. The results confirm that the average luminance value for multi-source luminaires depends on the measurement system configuration. It has been proposed to standardize the angular field of view parameters of all measurement systems, where the measurement aims to obtain a value that directly relates to human visual impressions (e.g. glare).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2022, 70, 5; art. no. e143103
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the configuration of the fiber-metal laminates on the dispersion relations of the elastic wave modes
    Autorzy:
    Barski, Marek
    Muc, Aleksander
    Stawiarski, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2146565.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    FML
    fiber metal laminates
    GLARE
    elastic wave modes
    dispersion curves
    stiffness matrix method
    laminaty metalowo-włókniste
    mody fal sprężystych
    krzywa dyspersji
    metoda macierzy sztywności
    Opis:
    The current work is devoted to the determination of dispersion curves for elastic wave modes. The studied elastic waves propagate across metal-fiber hybrid composites. In order to solve the problem, special software has been developed with the use of C++. This software works with the MS Windows operating system and the proposed solution is based on the multi-threading mechanism. It makes possible to significantly speed up the calculations. The relatively new approach is used namely the stiffness matrix method. At the very beginning, the dispersion curves are determined for the traditional composite materials of cross-ply configuration, for which the layers are made of glass fiber/epoxy resin and carbon fiber/epoxy resin. The impact of the total number of layers on the dispersion curves is investigated. Next, the influence of the thickness of the layers, which are made of aluminum alloy, on the dispersion characteristic is studied. In the second case, it is assumed that the total thickness of the composite material wall for all cases is identical.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 2; art. no. 2020202
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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