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    Tytuł:
    Preparation and cytological study of collagen/nano-hydroxyapatite/graphene oxide composites
    Autorzy:
    Wang, J.
    Wang, Y.
    Liu, D.
    Yang, Q.
    Huang, C.
    Yang, C.
    Zhang, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/307450.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    nanohydroksyapatyt
    tlenek grafitu
    mineralizacja
    kolagen
    nano-hydroxyapatite
    graphene oxide
    biomimetic mineralization
    collagen
    Opis:
    Biomimetic mineralized composite scaffolds are widely used as natural bone substitute materials in tissue engineering by inducing and assembling bonelike apatite. In this study, the single lamellar structure of graphene oxide (GO) powder was prepared via an improved Hummers’ method. Methods: To better mimic natural bone, the collagen (COL)/Nano-hydroxyapatite (nHA)/graphene oxide (GO) composite material was prepared by simulated body fluid (SBF) method using COL/GO as a matrix template. Hydroxyapatite (HA) with calcium ion deficiency was achieved via biomimetic mineralization, and it had properties closer to those of natural bone than pure HA has. Results: The mineralized COL/nHA/GO composites exhibited loose porous structures, and the connectivity of the holes was good and thus beneficial to the exchange of nutrients and excreted metabolites. Conculsions: Antibacterial and MTT experiment confirmed that the COL/nHA/GO composite material had excellent antibacterial property and biocompatibility. Hence, these results strongly suggested the mineralized COL/nHA/GO composite is a good candidate biomaterial to be applied in bone tissue engineering.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 4; 65-74
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organ-level evaluation of the carbon starvation hypothesis in deciduous broad-leaved Catalpa bungei plants undergoing drought-induced mortality
    Autorzy:
    Qiu, Q.
    Wang, J.
    Su, Y.
    Li, J.
    Ma, J.
    He, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078283.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Carbon starvation
    Catalpa bungei
    Drought
    Non-structural carbohydrate (NSC)
    Plant mortal-
    ity
    Opis:
    The carbon starvation hypothesis (CSH) is one of the current leading hypotheses regarding the mechanism of plant death, although it has not been sufficiently validated due to a lack of evidence. To help verify the role of carbon starvation in plant mortality, we measured the non-structural carbohydrate (NSC) concentration ([NSC]) in different organs (roots, stems, and leaves) of plants of Catlapa bungei clone 9-1 after the cessation of photosynthesis and death due to drought and in well-watered controls. Drought in- duced the loss of NSC reserves, which was observed in all organs at death, and carbon starvation appeared to begin after the cessation of photosynthesis. The [NSC] dynamics, occurrence time of carbon starvation, and survival time varied among the organs, and even within the same organs at different stem heights. Overall, our findings are compatible with the CSH in that carbon starvation occurs in roots, stems, and leaves and concurs with plant death during prolonged drought.
    Źródło:
    Dendrobiology; 2018, 80; 48-60
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A machine learning-based mobile robot visual homing approach
    Autorzy:
    Zhu, Q.
    Ji, X.
    Wang, J.
    Cai, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/201706.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    robot navigation
    visual homing
    panoramic vision sensors
    machine learning
    homing performance
    nawigacja robotów
    panoramiczny czujnik wizyjny
    uczenie maszynowe
    Opis:
    Visual homing enables mobile robots to move towards a previously visited location solely based on panoramic vision sensors. In this paper, a SIFT-based visual homing approach incorporating machine learning is presented. The proposed approach can reduce the impact of inaccurate landmarks on the performance, and generate more precise home direction with simple model. The effectiveness of the proposed approach is verified on both panoramic image databases and actual mobile robot, experimental results reveal that compared to some traditional visual homing methods, the proposed approach exhibits better homing performance and adaptability in both static and dynamic environments.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 621-634
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mobile robot visual homing by vector pre-assigned mechanism
    Autorzy:
    Ji, X.
    Zhu, Q.
    Wang, J.
    Cai, C.
    Ma, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201155.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    robot navigation
    visual homing
    panoramic vision
    ALV
    HiSS
    nawigacja robotów
    Opis:
    In this paper, we present an optimization mechanism for two popular landmark-based mobile robot visual homing algorithms (ALV and HiSS), called vector pre-assigned mechanism (VPM). VPM contains two branches, both of which can promote the homing performance effectively. In addition, to make the landmark distribution satisfy the equal distance assumption, a landmark optimization strategy is proposed based on imaging principle of the panoramic vision. Experiments on both panoramic image database and a real mobile robot have confirmed the effectiveness of the proposed methods.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 213-227
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue Behavior and Mechanism of FV520B-I Owing to the Effect of Loading Frequency on the Fatigue Property in HCF and VHCF Regime
    Autorzy:
    Wang, J.
    Zhang, Y.
    Shi, B.
    Zhao, Q.
    Sun, Q.
    Zhang, Z.
    Lu, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/353784.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ultrahigh loading frequency
    FV520B-I
    fatigue strength
    fatigue conversion model
    Opis:
    Fatigue property of FV520B-I is affected by the ultrahigh loading frequency significantly, and the ultrasonic fatigue experimental data can’t be employed directly to analyze the fatigue failure in the actual remanufacturing engineering. However few theories about the effect of loading frequency on the fatigue property of FV520B-I has ever been proposed. In this paper, both ultrasonic experiment and conventional experiment are conducted out to obtain the fatigue data. The effect of loading frequency on the fatigue data distribution is discussed firstly, its fatigue limit declines with the increase of the loading frequency. Then the fracture surface observations are captured, the fatigue property and fatigue behavior mechanism of FV520B-I is examined by analyzing the fracture surface features, crack initiation and failure observations. A new material frequency correction factor is proposed and introduced to eliminate the influence of the loading frequency on the FV520B-I fatigue property. FV520B-I empirical fatigue life conversion model and fatigue strength conversion model are established with comprehensive use of a fitting algorithm based on the combination of experimental data and classic formula. A clear understand of the effect of loading frequency on the fatigue property of FV520B-I is novel and has an important significance in guaranteeing the accuracy of the actual fatigue analysis of FV520B-I in the remanufacturing engineering.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 347-357
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Factors regulating the compositions and distributions of dissolved organic matter in the estuaries of Jiaozhou Bay in North China
    Autorzy:
    Hu, J.
    Zou, L.
    Wang, J.
    Ren, Q.
    Xia, B.
    Yu, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/48070.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    organic matter
    chromophoric dissolved organic matter
    dissolved organic matter
    particulate organic matter
    total carbohydrate
    amino acid
    biogeochemical process
    coastal environment
    chlorophyll a
    North China
    Źródło:
    Oceanologia; 2020, 62, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical evaluation of tendon connection with novel suture techniques
    Autorzy:
    Chen, Z.
    Wang, J.
    Wei, J.- S.
    Hou, Z.-Y.
    Li, M.
    Chen, Q.-X
    Powiązania:
    https://bibliotekanauki.pl/articles/306902.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ścięgno Achillesa
    IFLL
    biomechanika
    internal fixation with limited loop
    Achilles tendon
    biomechanics
    Opis:
    Achilles tendon rupture is a severe injury with poor curative effect due to its anatomical characteristic and mechanical peculiarity. Internal fixation of limited loop (IFLL) with steel-wire has been applied on patients with tendon rupture to fix the broken ends before physical rehabilitation. The purpose of this study is to investigate the biomechanical property and radiological characteristic of such suture technique for the repairment of tendon rupture. Methods: Tendons of pigs’ hint feet were separated for the biomechanical study. Suture surgery was performed according to the protocol of IFLL. Biomechanical Testing Machine was adopted to conduct the biomechanical tensile load examination. The maximal load, elastic modulus and tendon stiffness of the stitched tendons with or without reinforcement were examined. Results: The maximum tensile load of the stitched tendons using IFLL reached 1/4 of the uninjured tendon’s maximum tensile load, indicating that such suture technique is capable of providing enough tension for the ruptured tendon. Surprisingly, tendons fixed with titanium wire showed the highest load tension, which was comparable to the undamaged tendon. Therefore, we found the biomechanical basis of using IFLL in effectively connecting the rupture ends of tendons. Conclusions: In conclusion, we provide biomechanical evidence for the use of IFLL in treatment of Achilles tendon rupture, by providing enough strength for the ankle function. Such suture technique could help the patients with better rehabilitation and reduced in-hospital stay after Achilles tendon injury.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2018, 20, 1; 135-141
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for tracing exogenous DNA uptake in live spermatozoa and embryos
    Autorzy:
    Mu, Y.
    Wang, J.
    Liu, Z.
    Zhao, Y.
    Zhang, X.
    Jiao, M.
    Lv, J.
    Hao, J.
    Kong, Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087751.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    spermatozoa
    SMGT
    exogenous DNA
    IVF
    Źródło:
    Polish Journal of Veterinary Sciences; 2018, 21, 1; 193-202
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comprehensive surveillance of the antibody response to Borrelia burgdorferi s.l. in small ruminants in China
    Autorzy:
    Yang, J.
    Liu, Z.
    Guan, G.
    Li, Y.
    Chen, Z.
    Ma, M.
    Liu, A.
    Ren, Q.
    Wang, J.
    Luo, J.
    Yin, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/49708.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Medycyny Wsi
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2015, 22, 2
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermally induced damage in hexanitrohexaazaisowurtzitane
    Autorzy:
    Tian, Q.
    Yan, G.
    Sun, G.
    Huang, C.
    Xie, L.
    Chen, B.
    Huang, M.
    Li, H.
    Liu, X.
    Wang, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/358735.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    CL-20
    SAXS
    AFM
    thermal effects
    voids
    Opis:
    The evolution of the microstructure of hexanitrohexaazaisowurtzitane (CL-20) after a thermal stimulus plays a key role in the performance of CL-20. In the current work, microstructural variations of CL-20 caused by thermal treatment were investigated by X-ray diffraction, in situ variable-temperature optical microscopy, atom force microscopy, and small-angle X-ray scattering. A wave-like process, an abrupt volume expansion, movement, and fragmentation of CL-20 particles during phase transition were observed. After the phase transition (160 °C) the CL-20 sample acquired a very rough surface with numerous dimple depressions, and during the thermal decomposition stage (200 °C) a large number of voids were produced in both the bulk and the surface of the CL-20.
    Źródło:
    Central European Journal of Energetic Materials; 2013, 10, 3; 359-369
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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