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    Wyświetlanie 1-3 z 3
    Tytuł:
    Experimental study on SHPB cyclic impact of rubber-cement composite with different confine modes
    Autorzy:
    Yang, Rongzhou
    Xu, Ying
    Chen, Peiyuan
    Cheng, Lin
    Ding, Jinfu
    Fu, Hongxin
    Powiązania:
    https://bibliotekanauki.pl/articles/27312124.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    dzielony pręt Hopkinsona
    polimer wzmocniony włóknem węglowym
    kompozyt gumowo-cementowy
    oddziaływanie cykliczne
    energia pękania
    uszkodzenie
    odporność na uderzenia
    split Hopkinson pressure bar
    carbon fibre reinforced polymer
    rubber-cement composite
    cyclic impact
    damage
    fracture energy
    impact resistance
    Opis:
    To promote the application of rubber-cement composites as the main bearing structure and key components in practical engineering under frequent dynamic disturbances, in this work, the split Hopkinson pressure bar (SHPB) cyclic impact tests of rubber-cement composite specimens with four different confine modes were carried out in which the impact load increased sequentially. The relationship between average strain rate, ultimate strain and impact times and the relationship between peak stress, damage energy, ultimate strain and incident energy were analyzed. The results showed that the appropriate confine reinforcement treatment can make rubber-cement composite give full play to its deformation ability when it was completely damaged. Carbon fiber-reinforced polymer (CFRP) sheet and steel cylinder can work together with the rubber-cement composite matrix to resist impact load, which effectively improves the structural strength, damage fracture energy, and cyclic impact resistance of the rubber-cement composite. Finally, based on the effect difference of confine modes, the simplified plane force models of rubber-cement composite specimens with four different confine modes were established, which clearly revealed the completely different impact resistance mechanism of the rubber-cement composites with different constraints under cyclic impact loading.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 517--534
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Tensile Properties and Microstructures of Different Sites in Al-Si Alloy Casting Component
    Autorzy:
    Tao, Jianquan
    Xiang, Lin
    Chen, Xidong
    Sun, Jipeng
    Wang, Yanbin
    Du, Chuanhang
    Peng, Feifei
    Gao, Shiqing
    Chen, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/27765052.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    ZL114A alloy
    plaster-mold casting
    tensile properties
    microstructure
    fracture
    Opis:
    The tensile properties and microstructures of ZL114A alloy component with a complex shape are investigated at room temperature and 200°C, using the tensile tests, scanning electron microscopy and electron backscattering diffraction. Both thin wall and thick structure exhibit excellent properties, of which max ultimate tensile strength and elongation at break reach 314 MPa and 2.5% at room temperature, respectively. The ultimate tensile strengths of thin wall are 40 MPa and 25 MPa greater than those of thick structure at room temperature and 200°C, respectively. Moreover, the eutectic Si phases of thin wall exhibit a predominantly spherical morphology while of the morphology of thick structure are rod-like, resulting in the different mechanical properties between thin wall and thick structure. The fracture morphologies of thin wall and thick structure are studied to explain the difference in performance between thin wall and thick structure.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 585--589
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sire pedigree error estimation and sire verification of the Taiwan dairy cattle population by using SNP markers
    Autorzy:
    Chao, C.H.
    Yeh, Y.H.
    Chen, Y.M.
    Lee, K.H.
    Wang, S.H.
    Lin, T.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539078.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    Holstein cattle
    genetic testing
    sire pedigree
    Opis:
    Information regarding the correct pedigree of and relationship between animals is useful for managing dairy breeding, reducing inbreeding, estimating breeding value, and establishing correct breeding programs. Additionally, the successful implementation of progeny testing is crucial for improving the genetics of dairy cattle, which depends on the availability of correct pedigree information. Incorrect pedigree information leads to bias in bull evaluation. In this study, Neogen GeneSeek Genomic Profiler (GGP) 50K SNP chips were used to identify and verify the sire of Taiwanese Holstein dairy cattle and analyze the reasons that lead to incorrect sire records. Samples were collected from 2,059 cows of 36 dairy farms, and the pedigree information was provided by breeders. The results of sire verification can be divided into three categories: submitted unconfirmed sire, submitted confirmed sire, and incorrectly submitted verified sire. Data on the sires of 1,323 (64.25%) and 572 (27.78%) dairy cows were verified and discovered, respectively. Sires of 1,895 (92.03%) dairy cattle were identified, which showed that the paternal pedigree of dairy cattle could be discovered and verified through genetic testing. An error-like analysis revealed that the data of 37 sires were incorrectly recorded because the bull’s NAAB code number was incorrectly entered into the insemination records: for 19 sires, the wrong bull was recorded because the frozen semen of a bull placed in the wrong storage tank was used, 6 had no sire records, and for 12 sires, the NAAB code of the correct bull was recorded but with a wrong stud code, marketing code, or unique number for the stud or breed. To reduce recorded sire error rates by at least 27.78%, automated identification of the mated bull must be adopted to reduce human error and improve dairy breeding management on dairy farms.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 1; 61-65
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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