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    Wyświetlanie 1-12 z 12
    Tytuł:
    Research on peripheral clamping of large-aperture laser transport mirror
    Autorzy:
    Cao, Tingfen
    Liu, Bowu
    Wang, Hui
    Ni, Wei
    Zhang, Jinli
    Chen, Xiaojuan
    Li, Yingang
    Zhou, Hai
    Jiang, Xiaodong
    Hu, Dongxia
    Zhu, Qihua
    Powiązania:
    https://bibliotekanauki.pl/articles/27310087.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    transport mirror
    peripheral clamping
    surface distortion
    assembly structure
    Opis:
    This article introduces the study of peripheral clamping for large-aperture laser mirrors in high power laser facilities. Some multi-point clamping schemes were experimentally tested, the results of the experiments show that these schemes cannot meet the technical requirements, and in the simulation analysis, we explain the reason for this phenomenon. It is concluded that the additional bending moment caused by the non-ideal process factors in the multi-point clamping is the main cause for the surface distortion. Based on the above conclusions, we carried out research on minor-point clamping. Experimental verification of the minor-point clamping were done, the results show that the minor-point clamping can meet the requirements of technical indicators in whole process. This work can provide a reference for the design of the large-aperture transport mirror clamping structure, which may be used in huge laser devices and telescopes.
    Źródło:
    Optica Applicata; 2023, 53, 2; 227--238
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Experimental Study on Unipolar Induction
    Autorzy:
    Chen, K.
    Li, X.
    Hui, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030345.pdf
    Data publikacji:
    2017-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    01.55.+b
    03.50.De
    06.30.Ka
    41.20.Gz
    Opis:
    Unipolar induction phenomenon is a special kind of electromagnetic induction. There are two quite opposite theoretical explanations for this phenomenon, i.e., the N theory and the M theory. The research of unipolar induction has made significant progress, but there is no final conclusion by now. In this paper, an experiment of inversely rotating double Faraday disks and double magnets are designed, and the unipolar induction phenomenon is verified by means of theoretical calculation and experiment. Comparing and analyzing the theoretical calculation and experiment results, our experimental results support the N theory, that is to say, our experiment shows that the magnetic field does not rotate when the magnet rotates.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 2; 271-274
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elevated-temperature tensile deformation and fracture behavior of particle-reinforced PM 8009Al matrix composite
    Autorzy:
    Chen, Shuang
    Chen, Guoqiang
    Gao, Pingping
    Liu, Chunxuan
    Wu, Anru
    Dong, Lijun
    Huang, Zhonghua
    Ouyang, Chun
    Zhang, Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/2173538.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum matrix composite
    aluminum alloy 8009
    elevated-temperature tensile property
    interface
    fracture behavior
    kompozyt z osnową aluminiową
    stop aluminium 8009
    właściwość rozciągania w podwyższonej temperaturze
    zachowanie pęknięć
    Opis:
    Tensile tests of 8009Al alloy reinforced with SiC and Al₂O₃ particles fabricated by powder metallurgy (PM) were conducted at temperatures of 250–350°C and strain rates of 0.001–0.1 s⁻¹. The ultimate tensile strength and yield strength of the samples decreased while the temperature and strain rate increased. The elongation slightly decreased at first and then increased with growing temperature because of the medium-temperature brittleness of the alloy matrix. When the strain rate was 0.1 s⁻¹, the elongation of the 8009Al/Al₂O₃ composites always decreased with an increase in temperature because of the poorly coordinated deformation and weak bonding between the matrix and Al₂O₃ particles at such a high strain rate. The work-hardening rates of the composites sharply increased to maxima and then decreased rapidly as the strain increased. Meanwhile, the 8009Al/SiCₚ composites displayed superior UTS, YS, elongation, and work-hardening rates than those of the 8009Al/Al₂O₃ composites under the same conditions. Compared to 8009Al alloys reinforced with spherical Al₂O₃ particle, 8009Al alloys reinforced with irregular SiC particles exhibited a better strengthening effect. The fracture mechanism of the 8009Al/SiCₚ composites was mainly ductile, while that of the 8009Al/Al₂O₃ composites was primarily debonding at the matrix–particle interfaces in a brittle mode.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e138846, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unfinished Democracy: Transitional Justice in Taiwan
    Niedokończona demokracja: przejściowa sprawiedliwość na Tajwanie
    Autorzy:
    Chun-hung, Chen
    Han-hui, Chung
    Powiązania:
    https://bibliotekanauki.pl/articles/1185525.pdf
    Data publikacji:
    2016-10-24
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    Transitional Justice
    Human Rights
    Political Reconciliation
    Taiwan
    sprawiedliwość przejściowa
    prawa człowieka
    pojednanie polityczne
    Tajwan
    Opis:
    The article attempts to describe Taiwan's progress and a difficult position in practicing transitional justice during its democratic process. The first section reviews Taiwan's democratic progress and the impact on the implementation of transitional justice caused by a regime transition type. The second section describes Taiwan's authoritarian rule period, from February 28 Incident to the White Terror's political types of political cases. The third section analyses the reasons for Taiwan's unfinished transitional justice. The article claims that during Taiwan's political engineering of transitional justice, compensation for the victims was almost the only act of it and at the same time lacking legal or moral prosecution of the inflictors and the truth discovery. Taiwan has never had an opportunity to reflect on the damage caused by the system of the authoritarian rule, so that many inflictors or cooperators of the system have continued to serve in the democratized government in key positions, which has resulted in the prevailing phenomenon of impunity. Such a handling mode to compensate the victims, not willing to investigate the inflictors and seeking the historical truth, cannot solve the crime left by the authoritarian era alone, but it can also bring about a serious crisis of democratic governance in Taiwan.
    W artykule podjęto próbę opisania postępów Tajwanu i trudnej pozycji w praktykowaniu sprawiedliwości okresu przejściowego podczas jej demokratycznego procesu. W pierwszej części przedstawiono demokratyczne postępy Tajwanu i wpływ na wdrażanie sprawiedliwości okresu przejściowego spowodowanej przez rodzaj reżimu reżimowego. Druga część opisuje okres rządów autorytarnych Tajwanu, od 28 lutego Incydent do politycznych rodzajów politycznych spraw Białego Terroru. Trzecia sekcja analizuje powody niedokończonej przejściowej sprawiedliwości Tajwanu. Artykuł twierdzi, że podczas tajwańskiej inżynierii politycznej sprawiedliwości okresu przejściowego odszkodowanie dla ofiar było prawie jedynym aktem, a jednocześnie brakiem prawnych lub moralnych oskarżeń o napastników i odkrycie prawdy. Tajwan nigdy nie miał okazji do refleksji na temat szkód wyrządzonych przez system rządów autorytarnych, tak że wielu inflictors lub współpracownikami systemu nadal służyć w demokratyzacji rządu w kluczowych pozycjach, co spowodowało w panującym zjawiska bezkarności . Taki tryb manipulacja aby zrekompensować ofiary, bo nie chce, aby zbadać inflictors i poszukiwania prawdy historycznej, nie może rozwiązać przestępstwa pozostawioną przez samych czasach autorytarnych, ale może również doprowadzić do poważnego kryzysu demokratycznych rządów na Tajwanie.
    Źródło:
    Studia z Polityki Publicznej; 2016, 3, 4(12); 13-35
    2391-6389
    2719-7131
    Pojawia się w:
    Studia z Polityki Publicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Image compression and encryption algorithm with wavelet-transform-based 2D compressive sensing
    Autorzy:
    Fan, Jing-Hui
    Liu, Xian-Bao
    Chen, Yan-Bin
    Powiązania:
    https://bibliotekanauki.pl/articles/175122.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    wavelet transform
    compressive sensing
    chaos scrambling
    image encryption
    image compression
    Opis:
    By combining a wavelet transform with chaos scrambling, an image compression and encryption algorithm based on 2D compressive sensing is designed. The wavelet transform is employed to obtain the sparse representation of a plaintext image. The sparse image is measured in two orthogonal directions by compressive sensing. Then, the result of 2D compressive sensing is confused by the Arnold transform and the random pixel scrambling. The combination of four-dimensional chaos and logistic map is exploited to generate the first row of the key-controlled circulant matrix. The proposed algorithm not only carries out image compression and encryption simultaneously, but also reduces the consumption of the key by controlling the generation of measurement matrix. Experimental results reveal that the proposed image compression and encryption algorithm is resistant to noise attacks with good compression performance and high key sensitivity.
    Źródło:
    Optica Applicata; 2019, 49, 3; 461-472
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Defect solitons supported by kagome photonic lattices in biased photovoltaic-photorefractive crystals
    Autorzy:
    Hui, J.
    Lu, K.
    Zhao, C.
    Gao, L.
    Chen, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/173797.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    defect solitons
    photonic lattices
    photorefractive nonlinearity
    nonlinear optics
    Opis:
    We report that defect solitons can be supported by kagome photonic lattices with a defect in biased photovoltaic-photorefractive crystals. For a positive defect, these defect solitons exist only in the semi-infinite bandgap and are stable in the low power region but unstable in the high power region. For a negative defect, these defect solitons exist in both of the semi-infinite bandgaps and the first bandgap. In the semi-infinite bandgap, low-power defect solitons are stable when the negative defect depth is low and unstable when the negative defect depth is high, moderate-power defect solitons are stable when the negative defect depth is high, and high-power defect solitons are unstable for all the negative defect depths. In the first bandgap, defect solitons are stable in all the power regions when the negative defect depth is low. When the negative defect depth is high, defect solitons are stable in the high power region and unstable in the low power region. On the other hand, these defect solitons are those studied previously in kagome photonic lattices with a defect in biased non-photovoltaic-photorefractive crystals when the bulk photovoltaic effect is negligible and those in kagome photonic lattices with a defect in photovoltaic-photorefractive crystals when the external bias field is absent.
    Źródło:
    Optica Applicata; 2018, 48, 3; 349-359
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sp100 interacts with phage ΦC31 integrase to inhibit its recombination activity
    Autorzy:
    Lin, Yun
    Li, Zhi-Hui
    Wang, Jing-Jing
    Xu, Gua-Lan
    Shen, Qi
    Tian, Lin
    Xue, Jin-Lun
    Chen, Jin-Zhong
    Powiązania:
    https://bibliotekanauki.pl/articles/1039951.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    Sp100
    ΦC31 integrase
    recombination
    Opis:
    Phage ΦC31 integrase is a potential vector for the insertion of therapeutic genes into specific sites in the human genome. To understand the mechanism involved in ΦC31 integrase-mediated recombination, it is important to understand the interaction between the integrase and cellular proteins. Using a yeast two-hybrid system with pLexA-ΦC31 integrase as bait, we screened a pB42AD human fetal brain cDNA library for potential interacting cellular proteins. From the 106 independent clones that were screened, 11 potential interacting clones were isolated, of which one encoded C-terminal fragment of Sp100. The interaction between Sp100 and ΦC31 integrase was further confirmed by yeast mating and co-immunoprecipitation assays. The hybridization between a ΦC31 integrase peptide array and an HEK293 cell extract revealed that residues 81RILN84 in the N-terminus of ΦC31 integrase are responsible for the interaction with Sp100. Knocking down endogenous Sp100 with Sp100-specific siRNA increased ΦC31 integrase-mediated recombination but did not impact reporter gene expression. Therefore, endogenous Sp100 may interact with ΦC31 integrase and inhibit the efficiency of ΦC31 integrase-mediated recombination.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 1; 67-73
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of iodine value of sodium fatty acids on flotation of collophanite
    Autorzy:
    Liu, Runzhe
    Zhang, Guofan
    Zhang, Hui
    Liu, Lifen
    He, Lin
    Chen, Yanfei
    Powiązania:
    https://bibliotekanauki.pl/articles/109810.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    vcollophanite
    fatty acid
    iodine value
    Opis:
    The sodium fatty acids were firstly prepared by fatty acids with different iodine values which were from surfactant extraction using soybean oil fatty acid as raw material in this study. Effects of iodine value of sodium fatty acids on the flotation of collophanite were then investigated by flotation tests, contact angle measurements, adsorption tests, Krafft point measurements, foaming ability tests, and the resistance to the hard water measurements. Results show that the final flotation recovery was directly proportional to the iodine value of sodium fatty acid. Sodium fatty acid with higher iodine value has higher solubility and dispersity in the solutions, and stronger foaming ability and resistance to hard water. After interacting with collophanite, sodium fatty acid with higher iodine value made the mineral more hydrophobic, thus contributing to better flotation performances.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2019, 55, 3; 770-778
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Robust dual color images watermarking scheme with hyperchaotic encryption based on quaternion DFrAT and genetic algorithm
    Autorzy:
    Luo, Hui-Xin
    Gong, Li-Hua
    Chen, Su-Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/27310094.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    color image watermarking
    hyperchaotic encryption
    quaternion discrete fractional angular transform
    quaternion singular value decomposition
    genetic algorithm
    Opis:
    A robust dual color images watermarking algorithm is designed based on quaternion discrete fractional angular transform (QDFrAT) and genetic algorithm. To guarantee the watermark security, the original color watermark image is encrypted with a 4D hyperchaotic system. A pure quaternion matrix is acquired by performing the discrete wavelet transform (DWT), the block division and the discrete cosine transform on the original color cover image. The quaternion matrix is operated by the QDFrAT to improve the robustness and the security of the watermarking scheme with the optimal transform angle and the fractional order. Then the singular value matrix is obtained by the quaternion singular value decomposition (QSVD) to further enhance the scheme’s stability. The encryption watermark is also processed by DWT and QSVD. Afterward, the singular value matrix of the encryption watermark is embedded into the singular value matrix of the host image by the optimal scaling factor. Moreover, the values to balance imperceptibility and robustness are optimized with a genetic algorithm. It is shown that the proposed color image watermarking scheme performs well in imperceptibility, security, robustness and embedding capacity.
    Źródło:
    Optica Applicata; 2023, 53, 2; 261--280
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composition of norfloxacin-resistant bacteria and isolation of norfloxacin-degrading bacteria in subtropical aquaculture ponds in China
    Autorzy:
    Mao, Lutian
    Chen, Lifen
    Wang, Xirui
    Xu, Zhongbao
    Ouyang, Hui
    Huang, Biyou
    Zhou, Libin
    Powiązania:
    https://bibliotekanauki.pl/articles/4790189.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    high-throughput sequencing
    norfloxacin
    antibiotic resistant bacterium
    pond culture
    Opis:
    To analyze the composition of norfloxacin-resistant bacteria and norfloxacin-degrading bacteria in pond water and sediment in subtropical China, the composition of antibiotic resistant bacteria in pond water and sediment enriched with norfloxacin-containing medium was analyzed by high-throughput sequencing. Sediment and water samples were collected from 3 fish ponds in subtropical China, and domesticated with norfloxacin, subsequently norfloxacin-resistant bacteria through high-throughput sequencing of 16S rDNA, and isolated norfloxacin--degrading bacteria. Our results showed that the pond sediment and water contain a variety of norfloxacin-resistant bacteria, mainly from Proteobacteria, Bacteroidetes, Actinobacteria, Firmicutes, and Chloroflexi. Moreover, we isolated two norfloxacin-degrading bacteria (NorXu-2 and NorXu-3). The norfloxacin-degrading rate by NorXu-2 and NorXu-3 in the culture mediums with 200 μg/mL was the highest, which was up to 49.71% and 35.79%, respectively. When the norfloxacin concentration was 200 μg/mL, NorXu-2 and NorXu-3 had the best norfloxacin- -degrading effect at pH of 6, and the degradation rates were 53.64% and 45.54%, respectively. Moreover, NorXu-3 exhibited a good tolerance to high NaCl concentration. These results not only provided basic data for the follow-up study of the molecular mechanism of antimicrobial microbial degradation, but also provided potential norfloxacin degrading bacteria for norfloxacin removal and bioremediation in aquaculture environment.
    Źródło:
    Archives of Environmental Protection; 2022, 48, 4; 95--101
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reversal of drug resistance by silencing Survivin gene expression in acute myeloid leukemia cells
    Autorzy:
    Wu, Yao-Hui
    You, Yong
    Chen, Zhi-Chao
    Zou, Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/1040668.pdf
    Data publikacji:
    2008
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    chemotherapeutic resistance
    Survivin
    acute myeloid leukemia
    shRNA
    apoptosis
    Opis:
    The role of Survivin in the pathogenesis of leukemia was explored in order to discover the effective avenues for gene therapy. Most primary leukemia cells isolated from patients as well as three leukemia cell lines (HL-60, K562, and U937) all expressed Survivin gene. To investigate the relationship between Survivin and chemotherapeutic resistance, HL-60 cells were treated with daunorubicin (DNR), mitoxantrone (MIT) or arsenious oxide (As2O3), and it was found that after 24 h the level of Survivin mRNA was decreased by 9.7%, 41.0% and 27.5%, respectively. At 72 h, the level of Survivin mRNA was increased by 21.2% and 65.2% in HL-60 cells treated with DNR or MIT, but decreased by 33.2% in those treated with As2O3 as compared with that in the cells treated for 24 h. These results showed that DNR and MIT could initally decrease the expression of Survivin and then increase it, but As2O3 could decrease the Survivin expression continually. Furthermore, shRNA plasmids targeting the Survivin gene (pEGFP-Survivin), which can silence the expression of Survivin with a high specificity, were constructed. pEGFP-Survivin and pEGFP-H1 were transfected into HL-60 cells via electroporation and selected by G418, and HL-60/Survivin and HL-60/EGFP cells were obtained. After treatment with DNR, the cell survival rate and IC50 of DNR in HL-60/Survivin cells were decreased substantially as compared with those of HL-60/EGFP and HL-60 cells (IC50 of DNR: 18.3 ± 2.45 vs 40.8 ± 6.37 and 39.2 ± 5.91 ng/ml, respectively), and the apoptosis rate was elevated ((84.3 ± 19.7)% vs (45.8 ± 13.8)% and (50.9 ± 12.4)%, respectively). These results suggest that shRNA can down-regulate the expression of Survivin in HL-60 cells substantially and improve their sensitivity to DNR. They also further explain the pathogenesis of leukemia drug resistance and provide new theory in the design of clinical therapies.
    Źródło:
    Acta Biochimica Polonica; 2008, 55, 4; 673-680
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on optimal design of vibration reduction of centrifugal air conditioning chiller based on particle damping
    Autorzy:
    Xiao, Wangqiang
    Shi, Jinsong
    Chen, Hui
    Liu, Hua
    Powiązania:
    https://bibliotekanauki.pl/articles/2200880.pdf
    Data publikacji:
    2023
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    centrifugal air-conditioning chiller
    particle damping
    DEM
    vibration reduction
    optimal scheme
    Opis:
    Considering vibration of centrifugal air-conditioning chillers at working conditions of 300Hz and 386Hz, a vibration reduction method for centrifugal air-conditioning chillers based on particle damping is proposed. Firstly, the vibration transfer path of the chillers is determined based on dynamic characteristics analysis of the chillers. Secondly, the vibration sensitive area of the compressor is determined by finite element analysis. Then the energy dissipation is calculated by the discrete element method (DEM) to determine the optimal installation scheme of the damper. Finally, the vibration reduction effect of the chillers after arranging the damper is verified by experiments.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 189--201
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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