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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of accelerated ageing on some surface properties of UV-coated hackberry (Celtis australis L.) wood parquet
    Autorzy:
    Ayata, Ümit
    Esteves, Bruno
    Gürleyen, Levent
    Çakicier, Nevzat
    Ferreira, Jose
    Domingos, Idalina
    Türk, Mutlu
    Powiązania:
    https://bibliotekanauki.pl/articles/2067426.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    hackberry
    UV varnish
    ageing
    pendulum hardness
    colour
    glossiness
    adhesion
    Opis:
    The importance of UV-curable coatings is currently increasing. In the parquet industry, where UV systems are applied, it is beneficial to investigate new tree species as potential raw materials. This study was carried out to determine the effect of accelerated ageing on some surface properties of hackberry (Celtis australis L.) wood treated with UV system parquet varnish. UV system parquet varnishes were applied to hackberry wood surfaces in three and five layers, according to the requirements of industrial applications. The varnished surfaces were then exposed to UV rays for 252 and 504 h using UVA-340 lamps in a QUV ageing device. Glossiness, colour parameters, pendulum hardness and adhesion strength (pull-off) (MPa) were determined for the coated samples before and after ageing, and the results for the aged and unaged test samples were compared. Analysis of variance showed that the results were significant for all tests. The results for all tests varied by ageing time.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2021, 64, 208; 17--33
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Cradle-to-Grave Life Cycle Assessment Study on a New Countertop Material
    Autorzy:
    Silva, Luiza Fernandes Carneiro
    Silva, Maria Elisabete
    Brás, Isabel
    Domingos, Idalina
    Wessel, Dulcineia
    Ferreira, José Vicente
    Powiązania:
    https://bibliotekanauki.pl/articles/2028044.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    circular economy
    furniture
    life cycle assessment
    recycling
    Opis:
    The life cycle of furniture products has been decreased in the last years as a consequence of the continuous improvement of people’s housing conditions. This behavior increases the waste amount in an urban area. The focus of this study was developing a Life Cycle Assessment (LCA) (cradle-to-grave) of a new countertop product. Two scenarios for countertop waste management were proposed, one considering landfilling and another considering recycling. The functional unit chosen was 1 m2 of finished panel (countertop) and the boundary system involved the study of raw materials, product packaging, the panel production process, the installation process, the panel use, and its end of life. The chosen method for impact assessment was EPD (2018) available in the SimaPro PhD software. The results showed that recycling has a positive effect on the environmental impacts, with the variation ranging from 0.3% on Abiotic Depletion (FF) to 15.9% on Eutrophication. A comparison between the product studied and products with similar functions was also conducted and although this product was not the worst performer, it has a lot of room for improvement.
    Źródło:
    Journal of Ecological Engineering; 2021, 22, 11; 239-245
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of Use of Linden (Tilia tomentosa Moench.) Wood with UV System Varnish Application IN INDOOR Parquet Flooring
    Autorzy:
    Ayata, Ümit
    Esteves, Bruno
    Domingos, Idalina
    Ferreira, José
    Tuncay Efe, Fatih
    Türk, Mutlu
    Çakicier, Nevzat
    Gürleyen, Levent
    Peker, Hüseyin
    Powiązania:
    https://bibliotekanauki.pl/articles/27323543.pdf
    Data publikacji:
    2023
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    linden
    weathering
    UV cured varnish
    color
    pendulum hardness
    adhesion
    glossiness
    Opis:
    Linden wood is used in the making of musical instruments, agricultural hand tools, and in the furniture sector. In this study, the changes in glossiness (parallel (//) and perpendicular (⊥) to the fibers at 20o, 60o, and 85o), the pull-off adhesion test, color parameters (CIEL) and pendulum hardness (König method) of two different UV curable varnishes applied to linden (Tilia tomentosa Moench.) according to industrial application techniques and exposed to artificial weathering were investigated. According to the research results, while L*, ΔH*, and ho decreased with increasing weathering time in both varnish layers, ΔC*, b*, ΔE*, a*, and C* rose. The pendulum hardness grew for Method B but dwindled for Method A. A decrease was found in the adhesion tests for both varnish methods after artificial weathering. The glossiness was generally reduced due to artificial weathering for all the angles and for both directions, with the exception of 85º in Method A. The variance analysis and homogeneity groups showed that the changes in the adhesion, pendulum hardness, L*, a*, ho, C*, perpendicular and parallel to the fibers for 60o and 85o were found to be significantly different with artificial weathering for both methods.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2023, 66, 212; Art. no. 177636
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strategic thinking: The construction and validation of an instrument
    Autorzy:
    Rodrigues, Rosa Isabel
    Ferreira, Aristides
    Neves, José
    Powiązania:
    https://bibliotekanauki.pl/articles/2121835.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Strategic thinking
    psychological evaluation
    construction and validation
    human resources
    Opis:
    The lack of instruments that evaluate strategic thinking and the fact that it is positively related to high levels of professional performance has led us to the development and validation of a questionnaire that allows us to measure it in an organizational context. This was done through three studies. First an exploratory study, in which 272 Human Resources (HR) professionals participated, allowed us to develop its items and analyze its psychometric properties. From it three factors were extracted: (1) systemic thinking, (2) vision towards the future and, (3) identification of new opportunities. Also, the results indicated the existence of a latent overall model of strategic thinking. Secondly, a confirmatory study, where 352 Human Resources professionals participated, intended to validate the results of the previous study. The same three factors, and a latent factor were replicated revealing that the model presented had an excellent adjustment. Furthermore, a third study was carried out in order to study the perceived relationship between strategic thinking, satisfaction, trust and customers’ retention. This study counted with the participation of 273 professionals who held positions of middle and upper management, key employees regarding the use of ST in organizations. The results of the three studies allow us to conclude that the Strategic Thinking Questionnaire is a valid instrument to analyze strategic thinking.
    Źródło:
    Polish Psychological Bulletin; 2021, 52, 3; 241-250
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cod and Tradition. Cultural Effects Of Cod Fisheries in Portugal
    Autorzy:
    Coelho, Manuel Pacheco
    Junqueira Lopes, Rui
    Filipe, José António
    Ferreira, Manuel Alberto
    Powiązania:
    https://bibliotekanauki.pl/articles/520252.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Property rights are in the centre of fisheries management difficulties. In the 90s, Portuguese national fishing fleet lost more than 35% of the tonnage, a third of the fishermen, almost 30% of the production. The segment of distant water fisheries, especially of the cod, is accompanying this crisis. In one decade (1976 to 1986) this segment had to face two new restrictions to the development of fisheries: Extended Fisheries Jurisdiction and the integration in the Common Fisheries Policy. After a profound downsizing process we are still confronted with an overcapacity problem, face to the disposable quotas. Anyway, while the stocks rebuild, Public managers cannot stop defining social and cultural support policies for the affected populations and try to maintain the memory and the important traditions associated. One area mostly affected is Ílhavo. “The Sea for Tradition" is the slogan of the City hall that attests well the strong connection of the municipality to the sea. The guidelines for public management highlight the role of fisheries in the local development (anchored in reasons of geographical and historical nature), and the continuous exaltation of the maritime culture, with its maximum expression in the Maritime Museum and in other cultural manifestations of cod-oriented traditions (as religious festivities). The purpose of our paper is to study the socio-economic and cultural impacts of the institutional change in cod Portuguese fisheries.
    Źródło:
    Roczniki Socjologii Morskiej; 2011, 20; 27-39
    0860-6552
    Pojawia się w:
    Roczniki Socjologii Morskiej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Observed and modelled solar radiation components in sugarcane crop grown under tropical conditions
    Autorzy:
    A. dos Santos, Marcos
    L. de Souza, José
    B. Lyra, Gustavo
    Teodoro, Iêdo
    A. Ferreira Junior, Ricardo
    C. dos Santos Almeida, Alexsandro
    B. Lyra, Guilherme
    C. de Souza, Renan
    A. Maringolo Lemes, Marco
    Powiązania:
    https://bibliotekanauki.pl/articles/972744.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sugarcane
    albedo
    net radiation
    Opis:
    The net radiation over vegetated surfaces is one of the major input variables in many models of soil evaporation, evapotranspiration as well as leaf wetness duration. In the literature there are relatively few studies on net radiation over sugarcane crop in tropical climates. The main objective of the present study was to assess the solar radiation components measured and modelled for two crop stages of a sugarcane crop in the region of Rio Largo, Alagoas, North-eastern Brazil. The measurements of the radiation components were made with a net radiometer during the dry and rainy seasons and two models were used to estimate net radiation: the Ortega-Farias model and the Monteith and Unsworth model. The highest values of net radiation were observed at the crop development stage, due mainly to the high indices of incoming solar radiation. The daily average albedos of sugarcane at the crop development and mid-season stages were 0.16 and 0.20, respectively. Both models showed a better fit for the crop development stage than for the mid-season stage. When they were inter-compared, Monteith and Unsworth model was more efficient than Ortega-Farias model, despite the dispersion of their simulated radiation components which was similar.
    Źródło:
    International Agrophysics; 2017, 31, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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