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    Wyświetlanie 1-7 z 7
    Tytuł:
    Weighted-BMO and the Hilbert transform
    Autorzy:
    Jiang, Hui-Ming
    Powiązania:
    https://bibliotekanauki.pl/articles/1293544.pdf
    Data publikacji:
    1991
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Opis:
    In 1967, E. M. Stein proved that the Hilbert transform is bounded from $L^∞$ to BMO. In 1976, Muckenhoupt and Wheeden gave an analogue of Stein's result. They gave a necessary and sufficient condition for the boundedness of the Hilbert transform from $L^∞_w$. We improve the results of Muckenhoupt and Wheeden's and give a necessary and sufficient condition for the boundedness of the Hilbert transform from $BMO_w$ to $BMO_w$.
    Źródło:
    Studia Mathematica; 1991, 100, 1; 75-80
    0039-3223
    Pojawia się w:
    Studia Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Erdős-Gallai-Type Results for Total Monochromatic Connection of Graphs
    Autorzy:
    Jiang, Hui
    Li, Xueliang
    Zhang, Yingying
    Powiązania:
    https://bibliotekanauki.pl/articles/31343240.pdf
    Data publikacji:
    2019-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    total-colored graph
    total monochromatic connection
    Erdős- Gallai-type problem
    Opis:
    A graph is said to be total-colored if all the edges and the vertices of the graph are colored. A total-coloring of a graph is a total monochromatically-connecting coloring (TMC-coloring, for short) if any two vertices of the graph are connected by a path whose edges and internal vertices have the same color. For a connected graph G, the total monochromatic connection number, denoted by tmc(G), is defined as the maximum number of colors used in a TMC-coloring of G. In this paper, we study two kinds of Erdős-Gallai-type problems for tmc(G) and completely solve them.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2019, 39, 4; 775-785
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On Proper (Strong) Rainbow Connection of Graphs
    Autorzy:
    Jiang, Hui
    Li, Wenjing
    Li, Xueliang
    Magnant, Colton
    Powiązania:
    https://bibliotekanauki.pl/articles/32083886.pdf
    Data publikacji:
    2021-05-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    proper (strong) rainbow connection number
    Cartesian product
    chromatic index
    Opis:
    A path in an edge-colored graph $G$ is called a rainbow path if no two edges on the path have the same color. The graph $G$ is called rainbow connected if between every pair of distinct vertices of $G$, there is a rainbow path. Recently, Johnson et al. considered this concept with the additional requirement that the coloring of $G$ is proper. The proper rainbow connection number of $G$, denoted by $prc(G)$, is the minimum number of colors needed to properly color the edges of $G$ so that $G$ is rainbow connected. Similarly, the proper strong rainbow connection number of $G$, denoted by $psrc(G)$, is the minimum number of colors needed to properly color the edges of $G$ such that for any two distinct vertices of $G$, there is a rainbow geodesic (shortest path) connecting them. In this paper, we characterize those graphs with proper rainbow connection numbers equal to the size or within 1 of the size. Moreover, we completely solve a question proposed by Johnson et al. by proving that if \(G = K_{p1} \Box \dots \Box K_{pn}\), where $n≥ 1$, and $p_1, . . ., p_n>1$ are integers, then $prc(G) = psrc(G) = χ^′(G)$, where $χ^′(G)$ denotes the chromatic index of $G$. Finally, we investigate some suffcient conditions for a graph $G$ to satisfy $prc(G) = rc(G)$, and make some slightly positive progress by using a relation between $rc(G)$ and the girth of the graph.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2021, 41, 2; 469-479
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the cleanliness of super clean coal prepared by water-only cyclone
    Autorzy:
    Liu, Peikun
    Wang, Hui
    Jiang, Lanyue
    Zhang, Yuekan
    Yang, Xinghua
    Li, Xiaoyu
    Li, Feng
    Powiązania:
    https://bibliotekanauki.pl/articles/24085799.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cyclone separating
    chemical deashing
    super clean coal
    surface characteristics
    comparative study
    Opis:
    Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168129
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of spiral vanes width on the separation performance of a hydrocyclone
    Autorzy:
    Liu, Peikun
    Wang, Xiaoguo
    Jiang, Lanyue
    Zhang, Yuekan
    Yang, Xinghua
    Li, Xiaoyu
    Wang, Hui
    Powiązania:
    https://bibliotekanauki.pl/articles/27323656.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    hydrocyclone
    vane width
    numerical simulation
    separation performance
    Opis:
    Aiming at the problem of “entrainment fine particles in underflow” of hydrocyclone in grinding and classification process, a hydrocyclone with spiral vanes (the SV hydrocyclone) was proposed. The CFD techniques were used to study the pressure field, velocity field, turbulence field, particle field and classification efficiency of hydrocyclones with spiral vanes of different widths. The results show that the pressure drop, axial velocity, tangential velocity, turbulence intensity of SV hydrocyclone are reduced in different degrees compared with conventional hydrocyclone, and the reduction becomes more obvious with the increase of vane width. In the case of a vane width of 0.04D, the underflow recovery rate of 5μm and 10μm fine particles was reduced by 16.2% and 15.7%. The selection of spiral vanes with small widths is beneficial to improve the separation accuracy of fine particles and reduce the cut particle size.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 173563
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phyllodulcin Protects PC12 Cells Against the Injury Induced by Oxygen and Glucose Deprivation-Restoration
    Autorzy:
    Hu, Chang-Long
    Ge, Lu
    Tang, Yong
    Li, Jie
    Wu, Chun-Hui
    Hu, Jiang-Hong
    Yuan, Jin-Tao
    Fan, Yong-Zhong
    Powiązania:
    https://bibliotekanauki.pl/articles/895391.pdf
    Data publikacji:
    2019-12-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    apoptosis
    oxidative stress
    PC12 cells
    phyllodulcin
    oxygen and glucose deprivation/restoration
    Opis:
    Phyllodulcin is a natural coumarin derivative found in Hydrangea macrophylla. To discover effective therapeutics for cerebral ischemia-reperfusion injury, we investigated the protective effects of phyllodulcin on PC12 cells injury induced by oxygenation and glucose deprivation/restoration (OGD/R). As a result, phyllodulcin can improve the cell viability and attenuate the extracellular lactate dehydrogenase release. Meanwhile, phyllodulcin can ameliorate the dysfunction of mitochondria through reducing reactive oxygen species production, decreasing the intracellular calcium level and increasing the mitochondrial membrane potential. ROS-associated OGD/R can induce cell apoptosis through the mitochondrial pathway. Phyllodulcin can inhibit apoptosis of PC12 cells through down-regulation of Caspase-3 and Bax as well as up-regulation of Bcl-2. These results indicate phyllodulcin can protect PC12 cells against the damage induced by OGD/R. This investigation gives promising evidences for the therapy of cerebral ischemia-reperfusion injury.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 6; 1043-1050
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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
      Wyświetlanie 1-7 z 7

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