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    Wyświetlanie 1-7 z 7
    Tytuł:
    Międzynarodowy Ranking Uniwersytetów (Academic Ranking of World Universities)- metodologia i problemy
    Academic Ranking of World Universities - Methodology and Problems
    Autorzy:
    Liu, Nian Gai
    Cheng, Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/1365288.pdf
    Data publikacji:
    2016-02-11
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Opis:
    Instytut Szkolnictwa Wyższego (Institute of Higher Education), działający w ramach Shanghai Jiao Tong University, opublikował w Internecie międzynarodowy ranking uniwersytetów (Academic Ranking of World Universities), który odbił się szerokim echem na całym świecie. W rankingu tym szkoły wyższe szereguje się według wyników działalności dydaktycznej i badawczej. Wśród wskaźników stosowanych w rankingu znajdują się m.in. liczba absolwentów oraz pracowników zdobywających prestiżowe nagrody międzynarodowe, często cytowanych badaczy w ważniejszych dziedzinach badań, liczba artykułów publikowanych w wybranych, przodujących czasopismach oraz artykułów uwzględnianych w najważniejszych indeksach cytowań, a także efektywność działania ujęta w przeliczeniu na jedną osobę {performance per capita). Problemy metodologiczne omawiane w niniejszym artykule to m.in. ocena ilościowa i jakościowa, ocena działalności badawczej uczelni oraz oferowanego przez nie kształcenia, różnorodność instytucji szkolnictwa wyższego, język publikacji, kryteria wyboru nagród oraz doświadczenia edukacyjne i zawodowe osób uhonorowanych nagrodami. W artykule omówiono także zagadnienia natury technicznej, takie jak definicja szkoły wyższej, sposób formułowania nazw poszczególnych szkół, kwestia ich fuzji i podziałów, poszukiwanie oraz przypisywanie publikacji do autorów (instytucji).
    The Institute of Higher Education at Shanghai Jiao Tong University has published the Academic Ranking of World Universities on the Internet. The ranking has drawn wide attention worldwide. Within the ranking institutions are ranked according to their academic or research performance. Ranking indicators include the alumni and staff winning major International awards, highly cited researchers in major research fields, articles published in selected top journals and articles indexed by major citation indexes, as well as performance per capita. Methodological problems discussed in the article include quantitative versus qualitative evaluation, evaluation of research versus education, variety of institutions, language of publications, selection of awards and studying and working experience of award winners. The article also discusses technical problems such as definition of institutions, name expression of institutions, merging and splitting of institutions, searching and attribution of publications.
    Źródło:
    Nauka i Szkolnictwo Wyższe; 2005, 2, 26; 7-18
    1231-0298
    Pojawia się w:
    Nauka i Szkolnictwo Wyższe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the Spin-Hamiltonian Parameters and Local Structure of the Orthorhombic $Cu^{2+}$ Center in $PbTiO_3$ Crystal
    Autorzy:
    Chao-Ying, Li
    Li-Bin, Cheng
    Xue-Mei, Zheng
    Powiązania:
    https://bibliotekanauki.pl/articles/1400511.pdf
    Data publikacji:
    2015-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.30.Fc
    75.10.Dg
    71.70.Ch
    Opis:
    The spin-Hamiltonian parameters (the g factors $g_{i}$ and the hyperfine structure constants $A_{i}$, i = x, y, z) and local structure of the $Cu^{2+}$ center in $PbTiO_{3}$ are theoretically studied by using the perturbation formulae of these parameters for a $3d^{9}$ ion in an orthorhombically elongated octahedra. The orthorhombic center is attributed to $Cu^{2+}$ occupying the host $Ti^{4+}$ site associated with a nearest-neighbouring oxygen vacancy $V_{O}$ along the c-axis, and the impurity $Cu^{2+}$ off-center displacement $\Delta Z_{L}$ ( ≈0.18 Å) is smaller than that of the host $Ti^{4+}$ site ($\Delta Z_{H}$≈ 0.3 Å). Meanwhile, the planar $Cu^{2+}-O^{2-}$ bonds are found to experience the relative variation ΔR ( ≈ 0.098 Å) along the a- and b-axes, respectively, due to the Jahn-Teller effect and the size mismatching substitution of $Ti^{4+}$ by $Cu^{2+}$. The theoretical spin-Hamiltonian parameters based on the above defect structure agree well with the observed values.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 6; 1671-1675
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A stereological ubiquitiformal softening model for concrete
    Autorzy:
    Ou, Zhuo-Cheng
    Li, Guan-Ying
    Duan, Zhuo-Ping
    Huang, Feng-Lei
    Powiązania:
    https://bibliotekanauki.pl/articles/281602.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    ubiquitiform
    fractal
    concrete
    softening curve
    Opis:
    A stereological ubiquitiformal softening model for describing the softening behavior of concrete under quasi-static uniaxial tensile loadings is presented in this paper. In the model, both the damage evaluation process of fracture cross-sections and their distribution along the specimens axis are taken into account. The numerical results of a certain kind of full grade concrete made of crushed coarse aggregate are found to be in good agreement with the experimental data. Moreover, an experiental relation between the lower bound to the scale invariance of concrete and its tensile strength is also obtained by data fitting of the experimental data, which provides an effective approach to determine the lower bound to scale invariance of concrete.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 1; 27-35
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Preparation of magnesium hydroxide by modifier-directed hydration and its effect on flame retardancy and mechanical properties of polypropylene
    Autorzy:
    Wang, Mei Jia
    Bai, Li Mei
    Zhang, Meng Ting
    Ma, Yu Xin
    Zhao, Liu Cheng
    Li, Shao Ying
    Powiązania:
    https://bibliotekanauki.pl/articles/27323651.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    modifier
    hydration preparation
    magnesium hydroxide
    polypropylene
    Opis:
    With the rapid development of the polymer materials industry and the improvement of people's environmental awareness, magnesium hydroxide has been widely used in polymer materials due to its high decomposition temperature, non-toxic smoke suppression, and the advantages of neutralizing harmful gases produced by polymer combustion. However, the conventional preparation methods of magnesium hydroxide exhibit several issues, including high hydrophilicity, elevated polarity, and limited compatibility with polymers. This research proposes an improved method by adding sodium stearate and KH560 modifier, controlling the rate of magnesium oxide and preparing magnesium hydroxide flame retardants using a modifier-directed hydration method. Various characterizations confirmed its morphology, particle size and structure. The magnesium hydroxide exhibits low polarity, small particle size, stable structure and excellent hydrophobicity (with a contact angle of 120.32°, and a free energy of 1.34mN/m). In parallel, the magnesium hydroxide/polypropylene composites demonstrate excellent flame retardancy (LOI of 25%, V-1 grade) and simultaneously enhance the dispersion of magnesium hydroxide within the polypropylene matrix, improving the material's toughness and strength.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 175706
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ezetimibe prevents myocardial remodeling in an obese rat model by inhibiting inflammation
    Autorzy:
    Li, Xiao-Xing
    Zhao, Lang
    Chang, Ying
    Liu, Bao-Shan
    Xu, Feng
    Zhang, Cheng
    Ji, Xiao-Ping
    Chen, Yu-Guo
    Li, Chuan-Bao
    Powiązania:
    https://bibliotekanauki.pl/articles/1038380.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    obese
    inflammation
    remodeling
    ezetimibe
    IL-6
    Opis:
    Inflammation plays an important role in the development of many obesity-related diseases. This study aimed to investigate the effect of ezetimibe on inflammation and myocardial remodeling in obese rats. A rat model of obesity was established, and myocardial damage was examined by transmission electron microscopy and Masson staining. Twenty obese rats were divided into two groups (n=10): obese group and ezetimibe group. Ten SD rats were used as controls. Western blot was performed to monitor the expression of P-p38MAPK and interleukin (IL)-6. Immunohistochemical staining was used to monitor the expression of intercellular adhesion molecule-1 and vascular cell adhesion molecule-1. In the obese rats group, we observed increased inflammatory factors and myocardial hypertrophy. In contrast, the ezetimibe group exhibited decreased expression of inflammatory factors and an improvement in myocardial remodeling compared to the obese group. Mechanistically, we found that ezetimibe decreased P-p38MAPK, IL-6, intercellular adhesion molecule-1, and vascular cell adhesion molecule-1 levels in the hearts of the obese rats. Taken together, these results indicate that ezetimibe may improve myocardial remodeling in obese rats by inhibiting inflammation.
    Źródło:
    Acta Biochimica Polonica; 2018, 65, 3; 465-470
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of differential serum expression of three factors and pulmonary function in patients with silicosis
    Autorzy:
    Zhu, Ying
    Duan, Xia Yu
    Cheng, Yun Qi
    Yao, Xin Jing
    Xu, Hong
    Zhang, Kui Sheng
    Li, Feng Shi
    Yang, Fang
    Liu, Liang He
    Yuan, Xiang Ju
    Powiązania:
    https://bibliotekanauki.pl/articles/2086531.pdf
    Data publikacji:
    2021-08-05
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    silicosis
    pulmonary function
    early diagnosis
    ROC
    PTPN2
    factor B
    Opis:
    ObjectivesSilicosis is a chronic occupational lung disease. As was previously found by the authors, some proteins increased in the lung tissue of activated rats, and protein tyrosine phosphatase non-receptor type 2 (PTPN2), factor B, and vaccinia-related kinase 1 (VRK1) showed highly differential expressions.Material and MethodsIn this study, serum and bronchoalveolar lavage fluid samples were collected from patients with silicosis and healthy people to verify the expression of PTPN2, factor B, and VRK1. The diagnostic value of differentially expressed proteins for silicosis was judged.ResultsThe expression levels of serum PTPN2, VRK1, and factor B in patients with silicosis were significantly higher than those in the control group (p < 0.01). Higher serum PTPN2 and factor B concentrations significantly and negatively correlated with the ratio of forced expiratory volume in 1 s to forced vital capacity (FEV1/FVC), maximum vital capacity (VCmax), FEV1, and FVC, suggesting that the high expression of PTPN2 and factor B is associated with decreased pulmonary ventilation function and restrictive ventilatory impairment in patients with silicosis. All area under curve (AUC) measurements generated from single detection events were >0.744, with PTPN2 reaching the highest value (0.858). The AUC, sensitivity, and specificity for the combined diagnosis using factor B and PTPN2 were 0.907, 86.91% and 85.07%, respectively, for factor B and PTPN2. The 3 differentially expressed proteins are potential classes of predictive biomarkers for silicosis.ConclusionsRegarding the economy and test practicality, the best diagnostic combination is factor B and PTPN2 for the analysis of AUC, sensitivity and specificity.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2021, 34, 4; 527-540
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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