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Wyszukujesz frazę "Crown, E. M." wg kryterium: Wszystkie pola

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    Wyświetlanie 1-5 z 5
    Tytuł:
    How Clean is Clean Enough? Maintaining Thermal Protective Clothing Under Field Conditions in the Oil and Gas Sector
    Autorzy:
    Crown, E. M.
    Feng, A.
    Xu, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/90475.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    protective clothing
    decontamination
    flammability
    przemysł wydobywczy
    gaz kopalniany
    odzież ochronna
    izolacja cieplna
    tkaniny na odzież ochronną
    Opis:
    The purpose of this research was to develop practical care procedures to help maintain the protective quality of flame resistant workwear laundered by workers in the field. Based on observed field conditions, experiments were conducted that simulated domestic laundry procedures. The first experiment involved two flame resistant (FR) fabrics, contaminated or not contaminated with oil. Independent variables also included detergent type and laundry pre-treatment. Other laundry parameters were controlled. Results indicated that it is easier to maintain the FR performance of the FR-treated blend than it is for the aramid fabric. It is hypothesized that energy generated by initial ignition of oil on the specimens triggers the FR mechanism of the treatment, which in turn inhibits further combustion. A second experiment using larger specimens and a domestic washing machine also supported the hypothesized mechanism.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 3; 247-254
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protection From Steam at High Pressures: Development of a Test Device and Protocol
    Autorzy:
    Sati, R.
    Crown, E. M.
    Ackerman, M.
    Gonzalez, J.
    Dale, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/90402.pdf
    Data publikacji:
    2008
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    steam protection
    high pressure steam
    protective materials
    Opis:
    Extensive use of pressurized steam in the oil and gas sectors has led to incidents where workers were seriously injured. In this study a test device and procedure to measure heat transfer through fabrics during steam exposure were developed and evaluated. Several factors were considered while designing the test device to simulate work site conditions. Fabrics were exposed to steam at 2 distances (50 and 100 mm) and 2 pressures (207 and 69 kPa). Theoretical considerations included heat and mass transfer, and fabric structure and performance properties. The test device and procedure differentiated well among both fabric and exposure conditions. For all fabrics, maximum heat transfer was observed at highest steam pressure and shortest distance. Laminated and coated fabrics performed better than a fabric without such treatments.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2008, 14, 1; 29-41
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Moisture Effects in Heat Transfer Through Clothing Systems for Wildland Firefighters
    Autorzy:
    Lawson, L. K.
    Crown, E. M.
    Ackerman, M. Y.
    Dale, J. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/90762.pdf
    Data publikacji:
    2004
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    heat transfer
    moisture
    clothing systems
    ratownictwo
    środki ochrony indywidualnej
    odzież ochronna
    kombinezon
    straż pożarna
    Opis:
    Wildland firefighters work in unfavourable environments involving both heat and moisture. Moisture in clothing systems worn by wildland firefighters may increase or decrease heat transfer, depending on its source and location in the clothing system, location on the body, timing of application and degree of sorption. In this experiment, 4 outerwear/underwear combinations were exposed to 1 of 5 different conditions varying on amount and location of moisture. The fabric systems were then exposed to either a high-heat-flux flame exposure (83 kW/m2) or a low-heat-flux radiant exposure (10 kW/m2). Under high-heat-flux flame exposures, external moisture tended to decrease heat transfer through the fabric systems, while internal moisture tended to increase heat transfer. Under low-heat-flux radiant exposures, internal moisture decreased heat transfer through the fabric systems. The nature and extent of such differences was fabric dependent. Implications for test protocol development are discussed.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2004, 10, 3; 227-238
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The impact of plant shaping on aphid behavior
    Autorzy:
    Cichocka, E.
    Lubiarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/66076.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plant trimming
    plant pruning
    plant shaping
    aphid
    behaviour
    bionomics
    tree crown formation
    plant cutting
    Opis:
    The paper provides a review of the studies focusing on the impact of plant trimming and pruning (especially in tree rows) and tree crown formation (in orchards and urban greenery) on the bionomy and number of aphids and some other hemipterans. The fresh, succulent shoots which appear after any trimming and pruning provide aphids with "eternal spring" conditions, i.e. the availability of young leaves and shoots preferred by aphids as a source of nutrition. The majority of aphid species acquiring nutrition from leaves feed on the top shoots. People shape garden greenery, forming beautiful, decorative tree crowns. Some shoots in orchards are regularly cut off; sometimes even apple trees are planted in rows. Instead of building traditional fences, hedges are planted and regularly trimmed. Trimmed plants have fresh, succulent shoots, which are an attractive source of nutrition for many aphids. Large numbers of aphids inhabit these rejuvenated plants. Cutting and trimming of plants often have an impact not only on the number of aphids, but also on their bionomy.
    Źródło:
    Journal of Plant Protection Research; 2012, 52, 2
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nanomechanical comparison of commonly used dental crown cements to a newly developed one
    Autorzy:
    Kale, E.
    Arslanoğlu, Z.
    Altan, H.
    Bılgıç, F.
    Tuzlali, M.
    Köroğlu, A.
    Özarslan, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054940.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    62.20.-x
    62.20.Qp
    62.20.de
    Opis:
    The main goal of nanoindentation tests is to obtain elastic modulus and hardness of the specimen material from load-displacement measurements. With this study, it was aimed to establish a quantitative relationship between the nanomechanical properties of commonly used dental cements in comparison to a newly developed crown cement and to predict its performance potential. Nanomechanical properties of polycarboxylate cement (PCC), glass-ionomer cement (GIC), dual-cure self-adhesive cement (SAC) and a newly developed glass-carbomer cement (GCC) were investigated by nanoindentation tests. All samples were fabricated according to their respective manufacturer's instructions. Available damage on the surface due to manipulation was removed by grinding with 1200, 2400 and 4000 grit sandpaper, and then polishing on 6, 3, and 1 μm diamond-lap-wheel was performed. Nano-mechanical measurements were done using nanoindenter machine with resolution less than 1 nN and displacement resolution of 0.04 nm. Berkovich diamond indenter tip was used for the nanoindentation tests. For each indentation, a set of nanoindentation tests at least on 6 different locations per specimen surface were performed to obtain more representative mean results. Indentation test load-displacement curves were analysed using Oliver-Pharr method, and one-way ANOVA or Kruskal-Wallis test, following Kolmogorov-Smirnov and Shapiro-Wilk, was used to compare the results. Nanohardness (H_{nano}) values were 0.52± 0.25, 0.45± 0.18, 1.03± 0.82 and 0.43± 0.18 GPa for GIC, GCC, PCC, and SAC, respectively. Reduced elastic modulus (E_{r}) values were 9.51± 6.17, 11.77± 5.04, 27.37± 20.61, 10.33± 5.08 GPa for GIC, GCC, PCC, and SAC, respectively. There was no statistical difference between the tested materials. PCC was the hardest, and GIC was the least hard material, whereas the newly developed GCC was the second, in terms of H_{nano}, before SAC. PCC also had the highest E_{r} mean, compared to the other dental crown cements, suggesting lower elastic properties. SAC was more elastic than GCC and less elastic than GIC. GCC had the second highest E_{r}, standing closer to SAC and GIC. Within the limitations of the current study, it can be concluded that the newly developed glass-carbomer cement is comparable to the other tested commonly used dental crown cements, regarding H_{nano} and E_{r}.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 954-958
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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