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    Wyświetlanie 1-10 z 10
    Tytuł:
    Study of Ammonium Perchlorate-based Molecular Perovskite (H2DABCO)[NH4(ClO4)3]/Graphene Energetic Composite with Insensitive Performance
    Autorzy:
    Liu, Yang
    Hu, Li-shuang
    Gong, Shida
    Guang, Chunyu
    Li, Lianqiang
    Hu, Shuangqi
    Deng, Peng
    Powiązania:
    https://bibliotekanauki.pl/articles/1063027.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    ammonium perchlorate
    molecular perovskite
    graphene
    energetic composites
    composite desensitization
    Opis:
    In order to improve the safety properties of molecular perovskite energetic materials, ammonium perchlorate-based molecular perovskite ((H2DABCO)[NH4(ClO4)3], DAP)/graphene composite was prepared and characterized. Molecular perovskite DAP was prepared via a molecular assembly strategy by the facile one-pot reaction of triethylenediamine (TEDA, DABCO), perchloric acid, and ammonium perchlorate, and the DAP/graphene composite was fabricated by mechanical mixing with 10 wt.% graphene. The results demonstrated that impact sensitivity (>120 cm), friction sensitivity (25%) and electrostatic spark sensitivity (7.04 J) of the DAP/graphene composite was less sensitive than raw DAP (impact, friction and electrostatic spark sensitivity: 112.3 cm, 45%, and 5.39 J, respectively), due to the composite desensitization mechanism of graphene. This work may offer new ideas for the design and fabrication of insensitive molecular perovskite-based energetic composites.
    Źródło:
    Central European Journal of Energetic Materials; 2020, 17, 3; 451-469
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Molecular Perovskite (H2dabco)[NH4(ClO4)3]/Carbon Nanotubes Energetic Composite
    Autorzy:
    Hu, Li-shuang
    Liu, Yang
    He, Dan
    Yang, Yajun
    Gong, Shida
    Guang, Chunyu
    Deng, Peng
    Hu, Shuangqi
    Powiązania:
    https://bibliotekanauki.pl/articles/27788083.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    ammonium perchlorate
    (H2dabco)[NH4(ClO4)3]
    carbon nanotubes
    mechanical sensitivity
    thermal stability
    Opis:
    An ammonium perchlorate (AP, NH4(ClO4)3)-based molecular perovskite energetic material (H2dabco)[NH4(ClO4)3]/carbon nanotubes (DAP/CNTs) composite was prepared and characterized. Molecular perovskite DAP samples were synthesized by a facile one-pot reaction of triethylenediamine, perchloric acid (PCA, HClO4), and AP via a molecular assembly strategy. The results showed that the mechanical sensitivity (impact and friction sensitivities: >120 cm and 20%) and electrostatic spark sensitivity (8.90 J) of the DAP/CNTs energetic composite with 10 wt.% CNTs exhibited less sensitivity than that of DAP (impact, friction and electrostatic spark sensitivities: 112.3 cm, 45%, and 5.39 J, respectively), because of the mixing desensitization mechanism of CNTs. Compared with the pure DAP, the DAP/CNTs energetic composite has better performance with respect to thermal stability, exothermic capacity, and excellent continuous combustion properties. The DAP/CNTs energetic composite has potential application in a weapons system.
    Źródło:
    Central European Journal of Energetic Materials; 2022, 19, 1; 91--105
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Finite Element Treatment of Vortex States in 3D Mesoscopic Cylindrical Superconductors in a Tilted Magnetic Field
    Autorzy:
    Peng, Lin
    Hu, Yahua
    Li, Zhijian
    Deng, Ke
    Zhu, Yanyan
    Xu, Li
    Zhou, Yun
    Powiązania:
    https://bibliotekanauki.pl/articles/1030584.pdf
    Data publikacji:
    2018-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    three-dimensional mesoscopic cylinders
    TDGL equations
    finite element method
    vortex states
    Opis:
    The time-dependent Ginzburg-Landau equations have been solved numerically by a finite element analysis for the mesoscopic superconducting samples with cylindrical shape in a uniform axial magnetic field. We obtain the different vortex patterns as a function of the applied field perpendicular to its surface. We find that multi-vortex states are ground state in three-dimensional mesoscopic cylinders. These results show that our approach is an effective and useful to interpret experimental data on vortex states in the mesoscopic superconductors.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 1; 152-156
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on the propagation of laser beams array with coherent and incoherent combination in dynamic atmosphere turbulence
    Autorzy:
    Deng, Wantao
    Wang, Chengcheng
    Gan, Chunquan
    Xue, Liangping
    Xia, Huijun
    Wang, Peng
    Yang, Huan
    Powiązania:
    https://bibliotekanauki.pl/articles/2086761.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    laser propagation
    dynamic atmospheric turbulence
    coherent combination
    incoherent combination
    beam quality
    Opis:
    High-power laser systems mostly use coherent or incoherent combined beams to achieve higher laser output power to satisfy the application. However, the far-field beam quality of laser will be reduced when propagating over atmosphere. Based on the propagation model of laser beams array, we use atmospheric coherence length, laser duration and average wind velocity to construct dynamic atmospheric turbulence which is characterized as a phase screen sequence. Meanwhile, considered as the indexes to evaluate beam quality, peak intensity and intensity in bucket are comparatively analysed in coherent and incoherent combined beams in far-field. The results indicate that in weaker turbulence circumstances, coherent combined beam has an advantage compared with the incoherent combined beams when laser duration is short, and coherent combination is more suitable for pulsed laser. With laser duration is increasing, the beam quality of incoherent and coherent combined beams both decrease and tend to be close. In stronger turbulence circumstances, the corresponding laser duration will be shorter when the beam quality of coherent combined beams is extraordinary close to that of incoherent combined beams. The researches can provide important data for high-power laser system to select the optimal beam combination mode to improve its performance.
    Źródło:
    Optica Applicata; 2022, 52, 2; 243--257
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of calculation method of pure mode II stress intensity factor of fine-grained concrete using different numerical models
    Autorzy:
    Zhou, Changlin
    Peng, Bo
    Deng, An
    Gao, Xiaofeng
    Li, Yaojia
    Zhou, Lei
    Zhu, Zheming
    Powiązania:
    https://bibliotekanauki.pl/articles/1839720.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    fine-grained concrete
    critical stress intensity factor
    J-integral
    anti-symmetrical four-point bending
    FEM
    XFEM
    Opis:
    Measuring and calculating methods of critical stress intensity factors (SIFs) have become hot topics which attracted large attention recently. In this work, anti-symmetrical four-point bending tests of cracked fine-grained concrete specimens were conducted experimentally and numerically by using a computer-controlled universal testing machine and ABAQUS code. A comparative study of the calculation method of pure mode II stress intensity factor of a fine-grained concrete was performed by utilizing the conventional finite element method (FEM) in two and three dimensions as well as the extended finite element method (XFEM) in three dimensions. The results show that in three-dimensional models, the crack mode is closest to the pure mode II at the center of specimen thickness. Pure mode II stress intensity factors obtained by SEAM2D and XFEM3D are 1.013 and 1.0617 times that by SEAM3D, respectively. Pure mode II stress intensity factors of the fine-grained concrete obtained by the conventional FEM are more stable than that by XFEM. The number of mesh circles has slight influence on the calculation results of pure mode II stress intensity factor.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2021, 59, 2; 251-264
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on separation of fine-particle ilmenite and mechanism using flocculation flotation with sodium oleate and polyacrylamide
    Autorzy:
    Peng, Yang
    Xiao, Junhui
    Deng, Bing
    Wang, Zhen
    Liu, Nengyun
    Yang, Daoguang
    Ding, Wei
    Chen, Tao
    Wu, Qiang
    Powiązania:
    https://bibliotekanauki.pl/articles/1450088.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sodium oleate
    polyacrylamide
    synergistic effect
    ilmenite
    flocculation flotation
    Opis:
    In this paper, sodium oleate, polyacrylamide, soluble starch and sodium carboxymethyl cellulose were used as flocculants to study the flocculation and sedimentation behavior of microfine ilmenite. Sedimentation test shows that sodium oleate and polyacrylamide have good flocculation effect on ultrafine ilmenite. The flocculation rate of ilmenite can be further improved by the combination of sodium oleate and polyacrylamide. It was found that both flocculants could generate chemical adsorption with ilmenite surface, and they all react with $Fe^{3+}$ on ilmenite surface. However, sodium oleate reacts with $Fe^{3+}$ to form a water-insoluble iron oleate precipitate which coats the surface of the ilmenite and hinders the action of polyacrylamide and the remaining $Fe^{3+}$. This problem can be avoided by adding polyacrylamide followed by sodium oleate, and the flotation recovery can be increased significantly.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 1; 161-172
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seroprevalence of antibodies to classical swine fever virus and porcine reproductive and respiratory syndrome virus in healthy pigs in Hunan Province, China
    Autorzy:
    Yu, H.
    Zhang, L.
    Cai, Y.
    Hao, Z.
    Luo, Z.
    Peng, T.
    Liu, L.
    Wang, N.
    Wang, G.
    Deng, Z.
    Zhan, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/16539345.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    classical swine fever virus (CSFV)
    porcine reproductive and respiratory syndrome virus (PRRSV)
    pig
    seroprevalence
    antibody
    Opis:
    Classical swine fever (CSF) and porcine reproductive and respiratory syndrome (PRRS) are responsible for major economic losses and represent a threat to the swine industry worldwide. Routine surveillance serology for CSF and PRRS viruses is critical to maintaining the health status of sow farms in Hunan Province, which is one of the top pig production provinces in China. The aim of our study was to investigate the serological statistics of CSF virus (CSFV) and PRRS virus (PRRSV) in Hunan Province. The cohort serum samples were collected from vaccinated and unvaccinated pigs. Our findings showed that the average rates of CSFV and PRRSV antibody seropositivity were 82.2% (95% CI: 80.1-84.3) and 84.8% (95% CI: 82.5-87.1), respectively, in the immunized group and that these rates were higher than those in the unvaccinated group (58.6% for CSFV and 47.8% for PRRSV). Additionally, the level of CSFV antibody in piglet serum declined gradually with age, whereas PRRSV-specific antibody level increased initially (1 to 2 weeks old) and then declined with age (2 to 4 weeks old). In summary, we investigated the difference in CSFV/PRRSV antibody levels among piglets at various weeks old (1 to 4 weeks) to further establish the duration of maternal immunity in piglets. In addition, routine monitoring of CSFV/PRRSV antibodies in immunized pigs was carried out to evaluate the efficacy of vaccination.
    Źródło:
    Polish Journal of Veterinary Sciences; 2022, 25, 3; 375-381
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvements in timber production of Chinese fir (Cunninghamia lanceolata) per unit forest area in China via tree breeding: Status and challenges
    Autorzy:
    Zhou, B.
    Peng, D.
    Zhao, Q.
    Yangnan, S.
    Yang, S.
    Yang, F.
    Qu, G.
    Tang, W.
    Ou, J.
    Xiang, W.
    Xiang, J.
    Deng, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/2077649.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Cunninghamia lanceolata
    genetic improvement
    timber volumes per unit forest area
    wood properties
    proposals
    recommendations
    Opis:
    Chinese fir [Cunninghamia lanceolata (Lamb.) Hook] is a fast-growing tree species that is widely planted for timber production in southern China. Many high-quality breeding systems for Chinese fir have been developed using genetic methods. Here, we systematically review progress in increasing Chinese fir timber volumes per unit forest area in China, using genetic methods. We comprehensively assess the objec- tives, strategies, and primary accomplishments of the first to fourth generations of a Chinese fir breeding program. Furthermore, we propose a genetic improvement program and protocol for Chinese fir, and out- line several recommendations with respect to the main challenges associated with using genetic methods to increase timber yields. Finally, we present a series of proposals to increase Chinese fir timber production in China. This review offers insight into genetic improvements that have increased timber volumes of Chi- nese fir over four generations of breeding, and provides direction for future genetic improvements to wood properties.
    Źródło:
    Dendrobiology; 2020, 83; 43-51
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship of adiponectin, leptin, visfatin and IGF-1 in cow’s venous blood and venous cord blood with calf birth weight
    Autorzy:
    Shen, L.
    Zhu, Y.
    Xiao, J.
    Deng, J.
    Peng, G.
    Zuo, Z.
    Yu, S.
    Ma, X.
    Zhong, Z.
    Ren, Z.
    Zhou, Z.
    Liu, H.
    Zong, X.
    Cao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087491.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adiponectin
    leptin
    IGF-1
    birth weights
    cow
    Źródło:
    Polish Journal of Veterinary Sciences; 2019, 3; 541-548
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of serum adiponectin and leptin in healthy perinatal dairy cows or cows with ketosis, and their effectson ketosis involved indices
    Autorzy:
    Shen, L.
    Qian, B.
    Xiao, J.
    Zhu, Y.
    Hussain, S.
    Deng, J.
    Peng, G.
    Zuo, Z.
    Zou, L.
    Yu, S.
    Ma, X.
    Zhong, Z.
    Ren, Z.
    Wang, Y.
    Liu, H.
    Zhou, Z.
    Cai, D.
    Hu, Y.
    Zong, X.
    Cao, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087289.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    adiponectin
    dairy cows
    ketosis
    leptin
    perinatal period
    Źródło:
    Polish Journal of Veterinary Sciences; 2020, 23, 3; 373-381
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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