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    Wyświetlanie 1-4 z 4
    Tytuł:
    Mechano-sorptive creep of Portuguese pinewood chemically modified
    Autorzy:
    Lopes, D.B.
    Mai, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/38325.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    creep factor
    Portuguese pine wood
    pine wood
    chemically modified wood
    modified wood
    mechano-sorptive effect
    wax
    resin
    Opis:
    The effect of chemical modification on mechano-sorptive creep in bending was studied by experimental work. Stakes with 20 × 20 × 400 mm RTL of Portuguese wood species (Pinus pinaster Aiton) modified with 1,3-dimethylol-4,5- dihydroxyethyleneurea (DMDHEU), m-methylated melamine resin (MMF), tetraethoxysilane (TEOS) and amid wax (WA) were measured under asymmetric moistening conditions over a period of 42 days (app. 1000 hours) with stress level (SL) of 12 MPa, according to ENV 1156. The cell wall treatments (DMDHEU and MMF resins) had shown significant reduction of creep (creep factors, kc) when compared to untreated wood under similar conditions. Both types of resins and levels of treatments (different WPG) did not shown significant effects. In the lumen fill treatments, deposit material of TEOS did not affected the creep behaviour (kc); Wax treatment was shown a particular compliance of creep due to avoid exchange moisture (by the hydrophobic effect of wax). The anti-creep efficiency (ACE) correlated better than other mechanical or physical properties imparted by the modification process.
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2014, 56, 1
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bending creep of Maritime pine wood (Pinus pinaster Ait.) chemically modified
    Autorzy:
    Lopes, D.B.
    Mai, C.
    Militz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/38551.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    maritime pine
    cluster pine zob.maritime pine
    bending creep behaviour
    creep factor
    wood
    Pinus pinaster
    chemical modification
    Opis:
    The long-term performance of a structural member is determined by its durability and deformation with time. The bending creep behaviour of modified wood was assessed experimentally over a period of 35 days (840 hours). Four chemical modification processes were used: 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU), mmethylated melamine formaldehyde resin (MMF), tetraethoxysilane (TEOS) and amid wax (WA). Wood stakes with 20.10.200 mm RTL dimensions of Portuguese Maritime pine (Pinus pinaster Ait.) from sapwood part of the stem were used for evaluated the primary creep. Experiments were conducted at bending stresses amounting to 0.1, 0.2, 0.4 of the mean immediate wood bending strength obtained at equilibrium moisture content (EMC). Applying the same stress level (SL, 0.2), wood creep was also determined at the constant low and high moisture content. As results: Between low and medium SL (8 and 16 N/mm2), unmodified wood at indoors conditions did not show any effect in the creep factors (kc). However, at high SL (35 N/mm2) a slight increase (not significant) in the kc was found. It seems that the kc was nearly independent of the SL. In the lumen fill modification (TEOS and wax), the deposited material has not affected the creep behaviour under various SL. The cell wall modification (with DMDHEU and MMF resins) did not show any differences in the kc for low and medium SL (8 and 16 N/mm2). However, resin modification under high SL (35 N/mm2) has shown a significant reduction related to unmodified wood. Between both types of resin (DMDHEU and MMF) and levels of modification (WPG), significant effect was not found. At saturated conditions, lumen fill modification (TEOS and wax) did not show any effect on creep. In the cell wall modification (DMDHEU and MMF resin), significant reduction was recorded due to the embrittlement effect imparted by the modification (deposit of resin in the cell wall).
    Źródło:
    Folia Forestalia Polonica. Series A . Forestry; 2013, 55, 3
    0071-6677
    Pojawia się w:
    Folia Forestalia Polonica. Series A . Forestry
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The accumulation of SA- and JA-signaling pathways in the response of Glycine max cv. “Nam Dan” to infestation by Aphis craccivora
    Autorzy:
    Tran, N.T.
    Tran, T.T.H.
    Do, N.D.
    Mai, V.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/66714.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phytohormone
    signal molecule
    physiological process
    plant
    environmental stress
    aphid
    plant protection
    Glycine max
    infestation
    Aphis craccivora
    cowpea aphid
    black legume aphid zob.cowpea aphid
    true bug
    defense response
    jasmonic acid
    salicylic acid
    Opis:
    Phytohormones function as signal molecules that regulate physiological processes to protect plants from environmental stresses, including aphids’ attack. We studied the pattern within the defense mechanisms of soybean [Glycine max (L.) Merr. cv. “Nam Dan”] regarding the signaling pathways of salicylic acid (SA), and jasmonic acid (JA) in response to cowpea aphid (Aphis craccivora Koch). With infestation by cowpea aphid, SA was the first to accumulate and reached high levels 24 hours post-infestation (hpi). An accumulation of SA in the early response of soybean probably triggers inducible specific defense reactions. Following SA, JA was later induced and continuously increased to high levels 96 hpi. An accumulation of JA in the later response may be a critical step in the signaling of the downstream defense cascade. In addition, phenylalanine ammonia-lyase (PAL, EC 4.3.1.24) and benzoic acid 2-hydroylase (BA2H), enzymes involved in the biosynthesis of SA, and lipoxygenase (LOX, EC 1.13.11.12), an important enzyme in the JA biosynthesis pathway, were also induced by cowpea aphid. The changes in the enzymatic activity of PAL, BA2H and LOX, and expression of gene encoding PAL were closely associated with the accumulation of endogenous SA and JA, respectively. The variations in the levels of these defense-related compounds were strongly connected with density and the duration of cowpea aphid infestation. Different accumulations of SA- and JA-signaling pathways may contribute to a coordinated regulation leading to the formation of resistant lines in the defense mechanisms of G. max cv. “Nam Dan” against A. craccivora.
    Źródło:
    Journal of Plant Protection Research; 2017, 57, 4
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hemifacial asymmetries in age perception: the left cheek looks older for females, but not males
    Autorzy:
    Lindell, Annukka K
    Cianchetta, Rhiannon O
    Azim, Sana M
    Freeman, Cody G
    de Oliveira, Nicole C
    Saban, Sakire
    Messina, Julia L
    Wilson, Kira Elise
    Egan, Alanna
    Caspar, Megan D
    Grey, Emma J
    McDonald, Bryce A
    Croxford, Kylie N
    Bui, Thu Trang
    Aiello, Ashley A
    Heywood-Smith, Victoria M
    Kidd, Andrew J
    Stanley, Shenae C
    Wakeling, Alarna
    Hoggan, Stephanie A.L
    Morriss, Ashleigh S
    Trinh, Thi Phuong Mai
    Thai-Nguyen, Hong
    Fonte, Melissa
    Agolli, Franceska
    Powiązania:
    https://bibliotekanauki.pl/articles/2106020.pdf
    Data publikacji:
    2019-12-18
    Wydawca:
    Fundacja Edukacji Medycznej, Promocji Zdrowia, Sztuki i Kultury Ars Medica
    Tematy:
    emotion
    asymmetry
    hemisphere
    laterality
    age
    Opis:
    The left hemiface expresses emotion more intensely than the right. Because emotional expressions contract the facial muscles and wrinkle the skin, theoretically the left hemiface’s greater expressivity should prompt more pronounced expression lines and wrinkles on the left than right side of the face. As wrinkles are the most salient age cue, we investigated whether the left hemiface consequently appears older than the right. Two hundred and sixty participants (F=148; M=112) viewed booklets containing pairs of left-left and right-right chimeric faces of eight models (M=F). For each trial participants were asked to make a two alternative forced choice response indicating which image looked older. Results confirmed a left cheek bias, with participants more likely to select left-left than right-right chimeras. Whilst participant gender did not influence perceptions, model gender predicted cheek selections: responses to female models drive the overall left cheek bias. The left cheek (56.8%) appeared older than the right cheek (43.2%) for female models, whereas there was little difference in perceived age between male models' left (50.8%) and right (49.2%) cheeks. Given that youth influences perceptions of female beauty, these findings complement previous research and offer a potential explanation for why the left side of females’ faces are judged less attractive: the right cheek appears younger.
    Źródło:
    Acta Neuropsychologica; 2019, 17(4); 417-426
    1730-7503
    2084-4298
    Pojawia się w:
    Acta Neuropsychologica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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