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    Wyświetlanie 1-10 z 10
    Tytuł:
    Influence of vertical ground motion on seismic responses of triple friction pendulum interlayer isolation structures
    Autorzy:
    Fang, Zhao
    Yan, Ping
    Powiązania:
    https://bibliotekanauki.pl/articles/1852324.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ruch gruntu pionowy
    struktura
    izolacja międzywarstwowa
    odpowiedź sejsmiczna
    wahadło z potrójnym tarciem
    vertical ground motion
    interlayer isolation
    structure
    seismic response
    triple friction pendulum
    Opis:
    In order to investigate the influence of vertical ground motion on seismic responses of story-isolation structures mounted on triple friction pendulum (TFP) bearings, the finite element model of a six-story building with various types of interlayer isolation TFP bearings under far field or near fault ground motions is established and analysed. A discrepancy rate function of peak interlayer shear, acceleration and displacement results is adopted to discuss the influence of the vertical seismic motions on isolation structural responses. Furthermore, the isolation form, the isolation period and the friction coefficient of bearings are changed to study their effect on the vertical seismic component’s influence. The results show that the influence of the vertical seismic component is considerable on the isolation layer especially under near-fault ground motions, so it should not be overlooked during the structural design; The change of isolation forms will greatly affect the influence of the vertical seismic component especially in the isolation layer and isolation systems with isolation devices set on higher stories or with less isolation layers will have less vertical seismic effect on story acceleration; The increase of the isolation period will globally result in the decrease of the influence of vertical seismic components, though in some cases it shows some sort of fluctuation before the final decrease; The increase of the friction coefficient will lead to the global decrease in the influence of the vertical seismic component in single-layer isolation structures, while it does not obviously affect those in the multi-layer isolation systems.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 3; 581-597
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Stab Resistance of Coated UHMWPE Fabric
    Ocena odporności na przebicie powlekanej tkaniny z włókien polietylenowych o ultra wysokiej masie cząsteczkowej (UHMWPE)
    Autorzy:
    Yang, Wan-Qiu
    Liu, Xiao-Yan
    Yu, Yan-Ping
    Yu, Wei-Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/231896.pdf
    Data publikacji:
    2020
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    stab resistance
    fabric
    hard particles
    coating
    odporność na przebicie
    tkanina
    twarde cząstki
    powłoka
    Opis:
    In recent years, individual protection has attracted much attention in the area of personal safety, especially stab resistant clothing. Nowadays, fabrics of high performance fibre are often used in stab-resistant clothing. Therefore, in this paper ultra-high molecular weight polyethylene(UHMWPE) fibre fabrics were used to explore their distribution of boron carbide(B4C) particles. The effect of different processing techniques on stab resistance was discussed. Finally, it was found that when the particle dimension was 5 microns, the coating thickness 100 microns, the coating temperature 64 °C and the particle and binder ratio 2:3, the stab-resistance performance of the fabrics was best. The stab resistance of multi-layer fabrics was also discussed, and it was found that the relationship between energy absorber and the number of layers was changed by hard particles.
    W ostatnich latach ochrona indywidualna przyciągnęła wiele uwagi w zakresie bezpieczeństwa osobistego, zwłaszcza w przypadku odzieży odpornej na przebicie. W dzisiejszych czasach tkaniny z wysokowydajnych włókien są często stosowane w odzieży odpornej na przebicie. Dlatego w artykule wykorzystano tkaniny z włókien polietylenowych o ultra wysokiej masie cząsteczkowej (UHMWPE) do zbadania ich rozkładu cząstek węglika boru (B4C). Omówiono wpływ różnych technik przetwarzania na odporność na przebicie. Stwierdzono, że w przypadku wymiaru cząstek równemu 5 mikronom, grubości powłoki 100 mikronów, temperaturze powlekania 64 °C i stosunku cząstek i spoiwa 2:3, odporność na przebicie tkanin była najlepsza. Omówiono również odporność na przebicie tkanin wielowarstwowych i stwierdzono, że zależność między pochłoniętą energią a liczbą warstw uległa zmianie przez twarde cząstki.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2020, 2 (140); 76-79
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sequence analysis of human cytomegalovirus US28 gene in low-passage clinical isolates from children and AIDS patients
    Autorzy:
    He, Rong
    Xia, Chang
    Ruan, Qiang
    Qi, Ying
    Ma, Yan-Ping
    Ji, Yao-Hua
    Guo, Jin-Jin
    Powiązania:
    https://bibliotekanauki.pl/articles/1039923.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    chemokine receptors
    cytomegalovirus
    genetic polymorphism
    US28
    Opis:
    Human cytomegalovirus (HCMV) is often a dangerous opportunistic pathogen that causes significant morbidity and mortality in newborn children and immunocompromised patients. The different symptoms and tissue tropisms of HCMV infection may result from genetic polymorphism. This study investigated the sequence variability of the HCMV US28 ORF, which shows sequence homology to the G protein-coupled receptor. HCMV isolated from suspected pediatric cases and isolates from AIDS patients were compared in order to examine the possible associations between polymorphisms and pathogenesis. Seventy children with suspected congenital HCMV infection, who suffered from jaundice (47), megacolon (10), and microcephaly (13), and 17 AIDS patients, were studied. Mutation was prevalent among the sequences of US28, with a focus on the two ends of US28. The important functional groups of US28 are highly conserved. An unrooted tree showed that all sequences from suspected congenitally infected infants and AIDS patients were divided into three groups. Comparison showed that most of the sequences (12/17) from pediatric patients were included in the first group (G1), whereas most of the sequences (11/17) from AIDS patients were included in the third group (G3). The specific high mutation sites in US28 from children were located at the C terminus of the protein, whereas those from AIDS patients were located at the N terminus. We demonstrated the existence of polymorphisms among the US28 genes of clinical isolates of HCMV from infants with suspected congenital infection. Comparison of US28 sequences from AIDS patients with those from children showed that both sequences have their own specific high mutation points.
    Źródło:
    Acta Biochimica Polonica; 2011, 58, 2; 231-236
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An approach to suppress low-frequency oscillation in the hybrid multi-Infeed HVDC of mixed H2/H∞ robust-based control theory
    Autorzy:
    Li, Congshan
    Liu, Yan
    Li, Yikai
    He, Ping
    Fang, Yan
    Sheng, Tingyu
    Powiązania:
    https://bibliotekanauki.pl/articles/2042784.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    additional damping controller
    CSP
    HMIDC
    LFO
    mixed 2/∞ control
    TLS-ESPRIT
    Opis:
    A hybrid multi-infeed HVDC (HMIDC) system is composed of line-commutated converter-based high-voltage direct current (LCC-HVDC) and voltage-source converterbased high-voltage direct current (VSC-HVDC), whose receiving ends have electrical coupling. To solve the problem of low-frequency oscillation (LFO) caused by insufficient damping in the HMIDC system, according to the multi-objective mixed 2/∞ output feedback control theory with regional pole assignment, an additional robust damping controller is designed in this paper, which not only has good robustness, but also has strong adaptability to the change of system operation mode. In the paper, the related oscillation modes and transfer function of the controlled plant are obtained, which are identified by the total least squares estimation of signal parameters via rotary invariance technology (TLS-ESPRIT). In addition, the control-sensitive point (CSP) for suppressing LFO based on the small disturbance test method is determined, which is suitable for determining the installation position of the controller. The results show that the control sensitivity factor of VSC-HVDC is greater than that of LCC-HVDC so that adding an additional damping controller to VSC-HVDC is better than LCC-HVDC in suppressing the LFO of HMIDC. Finally, a hybrid double infeed DC transmission system with three receiving terminals is built on PSCAD/EMTDC where the time-domain simulations are performed to verify the correctness of the CSP selection and the effectiveness of the controller.
    Źródło:
    Archives of Electrical Engineering; 2022, 71, 1; 109-124
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Feasibility study of RANS in predicting propeller cavitation in behind-hull conditions
    Autorzy:
    Zhang, Yuxin
    Wu, Xiao-ping
    Lai, Ming-yan
    Zhou, Guo-ping
    Zhang, Jie
    Powiązania:
    https://bibliotekanauki.pl/articles/1573849.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    RANS
    Computational Fluid Dynamics (CFD)
    propeller cavitation
    turbulence model
    grid sensitivity
    Opis:
    The propeller cavitation not only affects the propulsive efficiency of a ship but also can cause vibration and noise. Accurate predictions of propeller cavitation are crucial at the design stage. This paper investigates the feasibility of the Reynolds-averaged Navier–Stokes (RANS) method in predicting propeller cavitation in behind-hull conditions, focusing on four aspects: (i) grid sensitivity; (ii) the time step effect; (iii) the turbulence model effect; and (iv) ability to rank two slightly different propellers. The Schnerr-Sauer model is adopted as the cavitation model. A model test is conducted to validate the numerical results. Good agreement on the cavitation pattern is obtained between the model test and computational fluid dynamics. Two propellers are computed, which have similar geometry but slightly different pitch ratios. The results show that RANS is capable of correctly differentiating the cavitation patterns between the two propellers in terms of the occurrence of face cavitation and the extent of sheet cavitation; moreover, time step size is found to slightly affect sheet cavitation and has a significant impact on the survival of the tip vortex cavitation. It is also observed that grid refinement is crucial for capturing tip vortex cavitation and the two-equation turbulence models used – realizable k-ε and shear stress transport (SST) k-ω – yield similar cavitation results.
    Źródło:
    Polish Maritime Research; 2020, 4; 26-35
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dexamethasone inhibits U937 cell adhesion via the down-regulation of ROCK1 activity
    Autorzy:
    Liu, Dong
    Chen, Xing
    Xiong, Ren
    Ning, Ya
    Li, Ping
    Peng, Yan
    Liu, Ping
    Zhao, Yan
    Yang, Nan
    Zhou, Yuan
    Powiązania:
    https://bibliotekanauki.pl/articles/1039650.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    dexamethasone
    ROCK1
    fasudil
    non-genomic effects
    Opis:
    Objective. To explore the effect of dexamethasone (DEX) on monocyte adhesion function and its underlying mechanism. Methods. The effects of DEX and fasudil on adhesion of cultured U937 monocytes to human umbilical vein endothelial cells (HUVEC) following stimulation with phorbol myristate acetate (PMA) were studied; Changes in the Rho-associated coiled-coil protein kinase 1 (ROCK1) protein content and activity were evaluated. Results. DEX and fasudil significantly inhibited U937 cell adhesion rates under PMA stimulation and inhibited ROCK1 activity. Mifepristone (RU-486) and cycloheximide (CHX) did not alter these effects of DEX. Conclusions. DEX interferes with the adhesion function of U937 cells through the inhibition of ROCK1 activity.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 557-560
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of pH value on effectiveness of biopolymer-based treatment of bauxite mine slurry
    Autorzy:
    Meng, Jian Ping
    Li, Shanmei
    Yan, Rongtao
    Wei, Changfu
    Powiązania:
    https://bibliotekanauki.pl/articles/24085778.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pH
    biopolymer
    xanthan gum
    bauxite mine slurry
    flocculation
    Opis:
    Effective dehydration and flocculation of mine slurries or sludge is important for nonferrous metal industries and environmental engineering. However, the mechanisms for the flocculation of slurry remain largely unclear. This paper presents the results of a series of flocculation tests, which was conducted on the slurry suspensions treated by xanthan gum (flocculant) at different pH values. It is shown that the settlement rate of mine slurry particles can be accelerated by adding xanthan gum, and the maximum sedimentation rate was obtained at a pH value of 5.9, and the final volume of flocs is significantly increased due to the addition of the flocculant. In addition, the settlement rates of xanthan gum-treated slurry suspensions at the pH values of 3, 5 and 7 decrease slightly compared with the reference slurry suspensions with pH=5.9, and the slurries remained stable as suspensions at the pH value of 9 and 11. The zeta potential measurement and SEM image analysis show that flocculation occurs primarily due to electrostatic attraction between slurry particles and the flocculants, and the bridging effect between the carboxylic groups in the side chains of xanthan gum molecule and the suspension particles.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 167949
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    EF1α is a suitable housekeeping gene for RT-qPCR analysis during osteogenic differentiation of mouse bone marrow-derived mesenchymal stem cells
    Autorzy:
    Chen, Xingyun
    Zhang, Bo
    Zhao, Yan
    Liu, Ping
    Zhou, Yuanguo
    Powiązania:
    https://bibliotekanauki.pl/articles/1039535.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    EF1α; RGS4; 18S rRNA; RT-qPCR; RPL 13a; CCG-1986
    Opis:
    The expression of predominant housekeeping genes used in RT-qPCR can vary during development and differentiation. The frequently used housekeeping genes (ACTB, GAPDH, 18S rRNA, EF1α and RPL 13a) were evaluated during an early stage of the osteogenic differentiation of mouse bone marrow-derived mesenchymal stem cells (mMSCs) (under normal conditions or treated with CCG-4986) to identify housekeeping genes whose expression remained constant during osteogenic differentiation. When we used RGS4 mRNA, which was determined as copy number per μg of total RNA, to normalize gene expression, we observed that the relative EF1α expression profile was consistent with RGS4 expression after treatment with CCG-4986. All the relative expression profiles of the EF1α, 18S rRNA, and RPL13a housekeeping genes were consistent with RGS4 profiles determined by measuring mRNA copies under normal osteogenic differentiation conditions. The expression profiles calibrated by ACTB and GAPDH were not consistent with those determined using mRNA copy number in untreated cells or cells treated with CCG-4986 under osteogenic differentiation conditions. Under normal osteogenic differentiation conditions, EF1α, 18S rRNA, and RPL 13a are suitable housekeeping genes for RT-qPCR analysis. However, EF1α is the only suitable gene upon CCG-4986 treatment.
    Źródło:
    Acta Biochimica Polonica; 2013, 60, 3; 381-386
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of socio-economic spatial structure of urban agglomeration in China based on spatial gradient and clustering
    Autorzy:
    He, Li
    Tao, Jian’ge
    Meng, Ping
    Chen, Dan
    Yan, Meng
    Vasa, László
    Powiązania:
    https://bibliotekanauki.pl/articles/19233717.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    economic and social development
    urban agglomeration
    Central Plains Urban Agglomeration (CPUA)
    clustering
    spatial gradient
    Opis:
    Research background: Previous studies on the economic and social development of urban agglomerations mostly focus on a single primacy comparative analysis and efficiency evaluation. Spatial structure differentiation is an important feature of urban agglomeration. The lack of economic and social analysis on the spatial structure makes it impossible to determine the development positioning of each city in the urban agglomeration, which affects the sustainable economic development ability of these areas. Purpose of the article: The objective of the article is to analyze the spatial development law and experience of urban agglomeration, this study explores the practice of economic and population spatial structure of city areas in China. For this purpose, CPUA and its central city Zhengzhou was taken as an example, the spatial gradient structure of example was analyzed. Methods: Using economic and population data of 32 cities in this region, growth pole theory, and pole-axis theory, the economic and population spatial structure of urban agglomeration, the spatial gradient structure of central cities in urban agglomerations were analyzed with the method of cluster about radiation index. Findings & value added: (1) In the process of the formation of CPUA, the geo-graphical spatial pattern plays a decisive role in economic and social development. This is an experience from developing countries. (2) CPUA presents a gradient development pattern with Zhengzhou as the center, and economic and social development gradually radiates to the metropolitan area, the core development area, and the character development demonstration area. (3) The economic and social gradients of Zhengzhou, the central city, present the hierarchy rules and characteristics which are driven by the Beijing-Guangzhou-Railway axis and the Longhai-Railway axis. (4) The central city of Zhengzhou still presents insufficient primacy in regional development, which shows that Zhengzhou accounts for 6% of the population of the Central Plains Economic Zone and 14% of GDP, and insufficient agglomeration. Different countries at different stages of economic development have different urban agglomeration development models. The conclusions from China provide new decision-making ideas and methods for spatial structure research and development strategy analysis of urban agglomerations.
    Źródło:
    Oeconomia Copernicana; 2021, 12, 3; 789-819
    2083-1277
    Pojawia się w:
    Oeconomia Copernicana
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification and tissue distribution of a novel rat glucocorticoid receptor splice variant
    Autorzy:
    Ju, Huiming
    Wang, Xia
    Liu, Zongping
    Liu, Ping
    Zhao, Yan
    Xiong, Renping
    Zhou, Yuanguo
    Chen, Xingyun
    Powiązania:
    https://bibliotekanauki.pl/articles/1040640.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    glucocorticoid
    glucocorticoid receptor
    receptor isoform
    splice variant
    Opis:
    Glucocorticoid receptor (GR) is a steroid hormone receptor that has been shown to play important roles in diverse cellular and physiological processes. More and more evidence has revealed that the effects of glucocorticoids are mediated by the glucocorticoid receptor through genomic or nongenomic mechanisms. A growing number of glucocorticoid receptor splice variants have been identified in human tissues, but few are known in rat tissues. In this work, a novel rGR cDNA, called rGRβ, was cloned from Sprague Dawlay (SD) rat liver. Sequence analysis revealed that the rGRβ mRNA was 39 base pairs (bp) shorter than the rGR mRNA reported earlier. The deleted segment is located in exon 1 and encodes 13 repeated glutamine residues. Both the rGR and rGRβ mRNAs were quantitated by Northern blot hybridization using non-homologous glucocorticoid cDNA probes. Results showed that the rGR and rGRβ mRNAs were most abundant in the lung, the least abundant in the heart, and there were more rGR and rGRβ mRNAs in the kidney than in the liver. The identification of rGRβ may contribute to the understanding of the genomic or nongenomic effects of glucocorticoids.
    Źródło:
    Acta Biochimica Polonica; 2009, 56, 1; 109-113
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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