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    Wyświetlanie 1-9 z 9
    Tytuł:
    Wpływ siedliska na wybrane właściwości strukturalne i fizyko-mechaniczne drewna brzozy brodawkowatej (Betula pendula Roth.)
    Effect of habitat on the selected structural and physico-mechanical properties of silver birch (Betula pendula Roth.) wood
    Autorzy:
    Lachowicz, H.
    Jednoralski, G.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/990000.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    brzoza brodawkowata
    Betula pendula
    siedliska lesne
    las swiezy
    las mieszany swiezy
    drewno brzozowe
    wlasciwosci strukturalne
    wlasciwosci fizykomechaniczne
    czynniki siedliska
    silver birch
    structural and physical−mechanical properties
    commercial quality
    habitat type
    Opis:
    The aim of the research was to determine the habitat−related variation in the selected structural and physical−mechanical properties of silver birch. Two sample plots were established in the territory of the Biała Podlaska Forest District in eastern Poland. Samples for measurement were taken from the plots with trees aged 45−50 years growing in the fresh deciduous (Lśw) and fresh mixed deciduous (LMśw) forest habitats. The following properties were subjected to statistical analysis: the average width of annual rings, wood density determined for the samples of 20×20×300 mm, 20×20×30 mm, and 30×2.66×0.1 mm in size (the last dimension parallel to grain), tensile strength parallel to grain, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coefficients of tensile strength parallel to grain, compression parallel to grain, static bending, and modulus of elasticity in static bending. The research confirmed a significant effect of the habitat on the mean values of birch wood density for all examined sample sizes, tensile strength parallel to grain, static bending and modulus of elasticity in static bending. No significant effect of the habitat on the mean values of annual ring width, tensile strength parallel to grain and the coefficients of tensile strength parallel to grain, compression strength parallel to grain, static bending and modulus of elasticity in static bending for birch wood samples was found.
    Źródło:
    Sylwan; 2014, 158, 04; 285-291
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jakość techniczna drewna 35-letnich świerków (Picea abies L. H. Karst) rosnących na powierzchni proweniencyjnej w LZD Rogów
    Technical quality of wood of 35 years old Norway spruce (Picea abies L. H. Karst) growing on experimental plot in the Rogow Forest Experimental Station
    Autorzy:
    Bieniasz, A.
    Lachowicz, H.
    Buraczyk, W.
    Moskalik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/986710.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewnictwo
    swierk pospolity
    Picea abies
    proweniencje
    drewno swierkowe
    jakosc techniczna
    wlasciwosci mechaniczne
    wlasciwosci fizyczne
    struktura drewna
    wood properties
    structural
    mechanical and physical parameters
    conifer timber
    Opis:
    The aim of this paper is to investigate and compare structural, mechanical and physical properties of wood of Norway spruce growing on experimental plot in Rogów (central Poland). The planting material consisted of seeds sourced from six selected provenances. Three of them originated from lowlands, while the others have mountain origins (tab. 1). The plot was established in 1975 and the wood was harvested in 2010. Wood samples were prepared and measured according to the Polish Standards describing those procedures. The following properties were subjected to the research and statistical analyses: average tree−ring width, share of latewood, wood density, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coeffi− cients of compression strength parallel to grain, static bending, and modulus of elasticity in static bending. Results of the investigation were correlated in the frame of each provenance. Wood density determines values of compression strength parallel to grain, static bending and modulus of elasticity in static bending. The higher wood density, the higher values of the mechanical properties. Ordering provenances by the wood density demonstrates the same results as ordering by values of compression strength parallel to grain. The high values of density and mechanical properties prove good technical quality of the analysed wood. The structural properties (the average tree−ring width and the share of latewood) are correlated to the wood density as well. They are additional features to describe wood quality, but are not as accurate as the mechanical properties. The quality of wood from all investigated provenances is high, what makes impossible to distinguish wood from selected provenances using applied features. Wood from Nowe Ramuki and Kartuzy (i.e. lowland) provenances has the best quality parameters, while one from Istebna Bukowiec and Stronie Śląskie (mountain) provenances demonstrated the worst properties (tab. 2). The results do not prove the opinion about the best quality of Norway spruce wood originating from the mountains.
    Źródło:
    Sylwan; 2017, 161, 10; 851-860
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Jakość techniczna drewna 35-letnich świerków (Picea abies L. H. Karst) rosnących na powierzchni proweniencyjnej w LZD Rogów
    Technical quality of wood of 35 years old Norway spruce (Picea abies L. H. Karst) growing on experimental plot in the Rogow Forest Experimental Station
    Autorzy:
    Bieniasz, A.
    Lachowicz, H.
    Buraczyk, W.
    Moskalik, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/986716.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewnictwo
    swierk pospolity
    Picea abies
    proweniencje
    drewno swierkowe
    jakosc techniczna
    wlasciwosci mechaniczne
    wlasciwosci fizyczne
    struktura drewna
    wood properties
    structural
    mechanical and physical parameters
    conifer timber
    Opis:
    The aim of this paper is to investigate and compare structural, mechanical and physical properties of wood of Norway spruce growing on experimental plot in Rogów (central Poland). The planting material consisted of seeds sourced from six selected provenances. Three of them originated from lowlands, while the others have mountain origins (tab. 1). The plot was established in 1975 and the wood was harvested in 2010. Wood samples were prepared and measured according to the Polish Standards describing those procedures. The following properties were subjected to the research and statistical analyses: average tree−ring width, share of latewood, wood density, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coeffi− cients of compression strength parallel to grain, static bending, and modulus of elasticity in static bending. Results of the investigation were correlated in the frame of each provenance. Wood density determines values of compression strength parallel to grain, static bending and modulus of elasticity in static bending. The higher wood density, the higher values of the mechanical properties. Ordering provenances by the wood density demonstrates the same results as ordering by values of compression strength parallel to grain. The high values of density and mechanical properties prove good technical quality of the analysed wood. The structural properties (the average tree−ring width and the share of latewood) are correlated to the wood density as well. They are additional features to describe wood quality, but are not as accurate as the mechanical properties. The quality of wood from all investigated provenances is high, what makes impossible to distinguish wood from selected provenances using applied features. Wood from Nowe Ramuki and Kartuzy (i.e. lowland) provenances has the best quality parameters, while one from Istebna Bukowiec and Stronie Śląskie (mountain) provenances demonstrated the worst properties (tab. 2). The results do not prove the opinion about the best quality of Norway spruce wood originating from the mountains.
    Źródło:
    Sylwan; 2017, 161, 10; 851-860
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of physical, mechanical, and structural seed properties of pepper cultivars
    Autorzy:
    Alibas, I.
    Koksal, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/26278.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    determination
    physical property
    mechanical property
    structural property
    seed
    pepper
    plant cultivar
    Opis:
    The aim of the present study was to determine va-rious physical, mechanical, and structural characteristics of seed of pepper cultivars Yağlık Kapya, Demre Sivri, Yalova Carliston, Kandil Dolma, and Cin Sus Yediveren, which are grown extensi-vely in Turkey, with initial moisture content ranging between 7.03 and 7.21% (w.b.). Width, length, and thickness were found to be in the range of 3.00-3.72, 3.43-4.40, and 0.66-0.82 mm, respectively. It was revealed that sphericity of the seeds of Yağlık Kapya, Demre Sivri, Yalova Carliston, Kandil Dolma, and Cin Sus Yediveren were 51, 57, 56, 51 and 57%, respectively. In terms of the roundness which ranges between 76 and 85% depending on pepper cultivars. The aspect ratio of Yağlık Kapya, Demre Sivri, Yalova Carliston, Kandil Dolma, and Cin Sus Yediveren were determined to be 84.60, 88.04, 94.43, 85.55, and 87.67%, respectively.It was also noted that the porosity of the pepper seeds was in the range of 44.94-49.61%. Besides, we found that as the weight of pep-per seeds increased, their terminal velocity increased accordingly, and thus terminal velocities were found to be 2.87-4.66 m s-1. In the current study, the static friction angle and coefficients of the cultivars were determined by means of six different plates including aluminium, stainless steel, galvanized iron, rubber, glass, and plywood. The plywood plate was found to be the least slippery; consequently, the static friction angle and coefficient were determined to be the highest for the plywood plate.
    Źródło:
    International Agrophysics; 2015, 29, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ niejednorodności cech fizykomechanicznych drewna na stan naprężeń w elementach konstrukcyjnych
    The influence of diversity of physical and mechanical properties of wood on the stress distribution in structural elements
    Autorzy:
    Baszeń, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/403049.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    szkieletowe konstrukcje drewniane
    właściwości fizykomechaniczne drewna
    badania eksperymentalne
    light wood framed structures
    physical and mechanical properties of wood
    experimental tests
    Opis:
    W pracy przedstawione zostały analizy wpływu właściwości fizykomechanicznych drewna na rozkład naprężeń oraz przemieszczeń węzłów w elementach ściennych oraz stropowych w szkieletowych konstrukcjach drewnianych. Przedstawiono wartości naprężeń i przemieszczeń konstrukcji otrzymane podczas badań eksperymentalnych przeprowadzonych w Politechnice Białostockiej. Przedstawiono również wartości cech fizykomechanicznych drewna użytego w analizowanych konstrukcjach.
    The influence of physical and mechanical properties of wood on the stress distribution and joint displacements in the wall and floor elements in the light wood framed structures was presented in this paper. There were presented stress values and displacement of construction obtained during the experimental tests in Bialystok Technical University, as well the values of physical and mechanical properties of wood used in the analyzed structures.
    Źródło:
    Budownictwo i Inżynieria Środowiska; 2010, 1, 4; 263-268
    2081-3279
    Pojawia się w:
    Budownictwo i Inżynieria Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of the Structural and Physical Properties of the Thermoplastic Starch Film with Kaolinite and Beeswax Addition
    Autorzy:
    Beer-Lech, Karolina
    Skic, Anna
    Skic, Kamil
    Stropek, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/2204046.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    biocomposites
    starch film
    thermoplastic starch film
    kaolinite
    beeswax
    microstructure
    mechanical properties
    Opis:
    The aim of the study was to investigate the influence of kaolinite (KA) and beeswax (BW) addition on the structural and physical properties of thermoplastic starch (TPS) films. The casting method was applied and glycerol was used as a plasticizer. Microstructure analyzes were made by a stereoscopic and a scanning electron microscope. Tensile tests were carried out under static load conditions at three different deformation velocities of V=0.0001, 0.001, and 0.01 m/s. The studies of surfaces characteristic were performed using water contact angle and water vapor isotherm measurements. The most homogeneous structure of the surface with higher mean values of failure stress and elasticity modulus was observed for thermoplastic starch films with kaolinite addition. The significant reduction in dynamics changes of water contact angle (10%) of BW films in the time 0-20s as well as tensile strength decrease was noted (compared to pure TPS films). The research results suggest the validity of using BW and KA to improve the barrier and mechanical properties of TPS films. Further research should focus on to improve the starch-beeswax-kaolinite combination and increase the homogeneity of the structure of films in order to upswing their simultaneous impact on barrier and mechanical properties.
    Źródło:
    Advances in Science and Technology. Research Journal; 2022, 16, 5; 312--323
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Physical and Mechanical Properties of Steel During Grinding and Sharpening
    Autorzy:
    Biały, Witold
    Ivanova, Tatiana Nikolaevna
    Žarnovský, Jozef
    Ružbarský, Juraj
    Powiązania:
    https://bibliotekanauki.pl/articles/2064901.pdf
    Data publikacji:
    2020
    Wydawca:
    STE GROUP
    Tematy:
    steel 8KHF
    sharpening
    edge
    thermal deformation
    structural transformations
    thermal process
    Opis:
    A direct influence on the physical and mechanical state of the surface layer of wedge-shaped plates made of 8KHF steel is exerted by heat generation processes developing in the zone of a high-speed thermal process. Research on the influence of the parameters of a high-speed thermal process on the change in the structure of 8KHF steel (GOST 5950-2000 Russia, standard PN/H 85023 brand NCV1 Poland) was fulfilled. It allowed studying the nature of the change in the microstructure depending on short-term heating to various temperatures and rapid cooling. As a result, critical points of the beginning and the end of structural transformations during heating were determined. Research on thermal processes in a high-speed thermal process made it possible to establish regularities of influence of cutting speed, source speed, contact area, coolant properties and heat transfer coefficient on the temperature and rate of thermal processes in surface layers, as well as their impact on the depth of heating to a certain temperature. The study also allowed us to show the relationship between temperature and rates of heating and cooling. The solution to this problem, taking into account the action of the cooling fluid, gives the opportunity to bring the picture of the development of thermal processes closer to real conditions and makes it possible to reasonably predict the structural state of the surface layer of wedge-shaped parts made of 8KHF steel under various conditions of a high-speed thermal process.
    Źródło:
    Multidisciplinary Aspects of Production Engineering; 2020, 3, 1; 128--140
    2545-2827
    Pojawia się w:
    Multidisciplinary Aspects of Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ocena zmian wybranych właściwości fizykostrukturalnych mieszaniny Poliamidu 6 z jego regranulatem w aspekcie aplikacyjnym
    Evaluation of the chosen physical and structural properties changes of the waste Polyamide PA6 mixture with its regranulate in applicational aspect
    Autorzy:
    Kapcińska, D.
    Gościański, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/335510.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
    Tematy:
    tworzywo sztuczne
    odpady
    poliamid
    regranulat
    właściwości mechaniczne
    właściwości strukturalne
    plastic
    waste
    polymer
    regranulate
    structural properties
    mechanical properties
    Opis:
    W artykule przedstawiono zmiany wybranych właściwości fizykostrukturalnych mieszanin poliamidu 6 (PA6) z jego regranulatem. Przeprowadzono badania chłonności wody, wytrzymałości, udarności, twardości, lepkości i właściwości strukturalne. W wyniku tych badań stwierdzono niekorzystny wpływ regranulatu na właściwości mechaniczne i strukturalne pierwotnego poliamidu.
    The paper presents the changes of chosen physical and structural properties of the waste polymer PA6 mixtures. Tested were: water absorptivity, strength, impact strength, hardness, stickiness, structural properties. As a result of these testings a generally disadvantageous influence of the waste polymer on mechanical and structural properties of primary polyamide.
    Źródło:
    Journal of Research and Applications in Agricultural Engineering; 2007, 52, 2; 39-42
    1642-686X
    2719-423X
    Pojawia się w:
    Journal of Research and Applications in Agricultural Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strength and structural properties of structural timber
    Właściwości strukturalno-wytrzymałościowe drewna konstrukcyjnego
    Autorzy:
    Rudziński, L.
    Wdowiak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/402209.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
    Tematy:
    timber
    macroscopic and microscopic structure
    physical and mechanical properties
    moisture
    Poland's nature and forest lands
    fresh and dried sawn timber
    artificial drying
    sorting in terms of strength
    drewno
    struktura makroskopowa i mikroskopowa
    właściwości fizyczne i mechaniczne
    wilgotność
    przyrodniczo-leśne tereny Polski
    świeża i suszona tarcica
    suszenie sztuczne
    sortowanie pod względem wytrzymałości
    Opis:
    Taking into account the growing significance of structural timber in the building industry, the paper aims at defining the selected mechanical and physical properties of the Polish pine structural sawn timber from four nature and forest lands: Land A – Mazovian-Podlasian Nature and Forest Land (Forest District Garwolin), Land B – Little Poland Nature and Forest Land (Forest District Przedbórz), Land C – Silesian Nature and Forest Land (Forest District Kedzierzyn Koźle), Land D – Carpathian Nature and Forest Land (Forest District Piwniczna) [4]. The paper presents the definition of timber, its macroscopic and microscopic structure as well as factors affecting the mechanical properties of timber such as moisture or structural defects. The conducted tests involved sorting sawn timber in terms of strength using visual method according to the PN-D-94021 standard as well as characterizing the average moisture of the fresh and artificially dried sortment [6-8].
    Źródło:
    Structure and Environment; 2016, 8, 2; 103-108
    2081-1500
    Pojawia się w:
    Structure and Environment
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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