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A packing k -coloring of a graph G is a partition of V ( G ) into sets V 1 , … , V k such that for each 1 ≤ i ≤ k the distance between any two distinct x , y ∈ V i is at least i + 1 . The packing chromatic number, χ p ( G ) , of a graph G is the minimum k such that G has a packing k -coloring. Sloper showed that there are 4 -regular graphs with arbitrarily...
How loss-of-function of GATA3 contributes to the development of breast cancer is poorly understood. Here, we report that GATA3 nucleates a transcription repression program composed of G9A and MTA3-, but not MTA1- or MTA2-, constituted NuRD complex. Genome-wide analysis of the GATA3/G9A/NuRD(MTA3) targets identified a cohort of genes including ZEB2 that are critically involved in epithelial-to-mesenchymal...
Vertically and neatly arranged crystalline graphitic C3N4 (g-C3N4) nanocone arrays were firstly synthesized on nickel-covered silicon (100) substrates supported on a graphite frame. Synthesis was accomplished using an abnormal glow discharge plasma sputtering reaction deposition method with a feed gas mixture of CH4, N2 and H2. The experimental results show that the morphologies, structures, composition...
The morphology and microstructure of PA46 wear debris and transfer film were studied by using scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FT-IR) and X-ray diffractometer (XRD) for understanding the physical and chemical changes of PA46 caused by friction. An acid-eroding method was used to peel the transfer film from the mated steel ring surface. It was found that...
PA46/HDPE polyblends with different component ratios and the same content of compatibilizer HDPE-g-MAH were prepared to investigate the main influence factors for the tribological properties of the polyblends. Scanning electron microscopy (SEM), differential scanning calorimetry (DSC) and X-ray diffraction (XRD) were used for investigating the phase structure and crystalline characteristics of the...
The friction properties of poly(acrylic acid) (PAAc) hydrogel have been studied under low loads using a ball-on-plate friction tester. And the influences of atmospheres, load, water contents of the polymers and its surface morph have been investigated. It is found that the friction coefficient of hydrogels is obviously lower in water than in air. The friction coefficient of PAAc hydrogel decreases...
Polymer blending is a very important and widely used method for the modification of polymer materials. The mechanical properties, miscibility and modification mechanisms of blends have been investigated earlier. However, studies of their tribological behavior have been few, and little attention has been paid to the friction and wear mechanisms of polymer blends. In this paper, the structure, mechanical...
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