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Synthesis, structure and tribological performance of tungsten disulphide nanocomposites
Si, Ping-Zhan,Choi, Chul-Jin,Lee, Jae-Wook,Geng, Dian-Yu,Zhang, Zhi-Dong Elsevier Sequoia 2007 Materials science & engineering Structural materia Vol.443 No.1-2
<P><B>Abstract</B></P><P>Tungsten disulphide nanocomposites were prepared in large scale by employing the direct reaction between tungsten nanoparticles and sulphur powders. The nanocomposites include a variety of shapes such as isolated WS<SUB>2</SUB> multi-layered sheets, WS<SUB>2</SUB>-coated WO<SUB>3</SUB> nanoparticles, and enclosed fullerene-like WS<SUB>2</SUB> structures. Pin-on-disc wear tests indicate that the addition of a small amount (5wt%) of these nanoparticles to paraffin decreases significantly the wear loss of the pin. Additives of these WS<SUB>2</SUB>/WO<SUB>3</SUB> nanoparticles possess much better tribological performance than micrometer-sized WS<SUB>2</SUB> powders additives do. The surface topography of wear scar of the pins after wear tests with different additives and different loads were studied by scanning electron microscopy. Small (severe) damage of the pin surface was observed for WS<SUB>2</SUB>/WO<SUB>3</SUB> nanoparticles (WS<SUB>2</SUB> micropowders) additives.</P>
Si, Ping-Zhan,Qian, Hui-Dong,Choi, Chul-Jin,Park, Jihoon,Ge, Hong-Liang North-Holland Pub. Co 2018 Journal of magnetism and magnetic materials Vol.451 No.-
<P><B>Abstract</B></P> <P>The temperature for phase transformation of ε → τ in Mn<SUB>54</SUB>Al<SUB>46</SUB>C<I> <SUB>x</SUB> </I> (hereafter denoted by MnAlC<I> <SUB>x</SUB> </I>, <I>x</I> = 0–5) alloys was systematically studied by using the traditional thermal analysis method and a more precise magnetic measurement method developed in this work. The effect of carbon content and cold-rolling on the magnetic properties of the MnAlC<I> <SUB>x</SUB> </I> alloys was studied. The onset temperature of massive growth of τ- from ε-phase increases with increasing carbon content in MnAlC<I> <SUB>x</SUB> </I>. The carbon content has little effect on the onset temperature of displacive growth of ε → τ but has substantial effect on the displacive growth rate at certain temperature. Pure τ-MnAlC<SUB> <I>x</I> </SUB> with varied <I>x</I> was obtained by annealing the ε-phase at optimum temperatures determined by our method. The Curie temperature of the MnAlC<SUB> <I>x</I> </SUB> decreases significantly first and then increases slightly with increasing carbon content. The coercivity and the remanent magnetization of the as-prepared τ-MnAlC<SUB> <I>x</I> </SUB> increase with increasing <I>x</I> first and become stable at <I>x </I>> 3 and <I>x</I> > 4, respectively. A cold-rolling method was introduced in this work to enhance the magnetic properties of τ-MnAlC<SUB> <I>x</I> </SUB>. The coercivity and remanent magnetization of the τ-MnAl after cold-rolling were enhanced up to 4.3 times and 3.3 times, respectively. The coercivity of the cold-rolled τ-MnAlC<SUB> <I>x</I> </SUB> decreases with increasing <I>x</I> and becomes stable when <I>x</I> > 2. The remanent magnetization and saturation magnetization of the cold-rolled τ-MnAlC<SUB> <I>x</I> </SUB> vary little with <I>x</I>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A method to measure the phase transformation temperature of MnAl-C is reported. </LI> <LI> A cold-rolling method is employed to enhance the magnetic properties of MnAl-C. </LI> <LI> The phase transformation temperature increases with increasing carbon content. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fu, Si-Rui,Zhang, Ying-Qiang,Li, Yong,Hu, Bao-Shan,He, Xu,Huang, Jian-Wen,Zhan, Mei-Xiao,Lu, Li-Gong,Li, Jia-Ping Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.7
Background: Sorafenib is a promising drug for advanced hepatocellular carcinoma (HCC); however, treatment may be discontinued for multiple reasons, such as progressive disease, adverse events, or the cost of treatment. The consequences of sorafenib discontinuation and continuation are uncertain. Materials and Methods: We retrospectively analyzed 88 HCC patients treated with sorafenib from July 2007 to January 2013. Overall survival (OS), post-disease progression overall survival (pOS), and time to disease progression (TTP) were compared for survival analysis. Cox proportional hazard regression was performed to assess the effect of important factors on OS in the overall patient population and on pOS in patients who continued sorafenib treatment. Results: Sorafenib was discontinued and continued in 24 and 64 patients, respectively. The median OS (355 vs 517 days respectively; p=0.015) and median post-PD OS (260 vs 317 days, respectively; p=0.020) were statistically different between the discontinuation and continuation groups. Neither the median time to first PD nor the time to second PD were significantly different between the 2 groups. In the discontinuation group, 3 of the 24 patients (12.5%) suffered disease outbreaks. In Cox proportional hazard regression analysis after correction for confounding factors, BCLC stage (p=0.002) and PD site (p=0.024) were significantly correlated with pOS in patients who continued sorafenib treatment. Conclusions: Sorafenib discontinuation may cause HCC flares or outbreaks. It is advisable to continue sorafenib treatment after first PD, particularly in patients with Barcelona Clinic Liver Cancer stage B disease or only intrahepatic PD.
Ting-Ting Qi,Ping-Zhan Si,Fang Cheng,Zhi-Rui Wang,Hong-Liang Ge,Qiong Wu,Jihoon Park,Chul-Jin Choi 한국자기학회 2023 Journal of Magnetics Vol.28 No.1
Cubic perovskite-type Mn4C is difficult to prepare for its metastable characteristics. In this work, we have obtained high-purity Mn4C successfully by using melt-spinning method. The effects of stoichiometry on the structure and magnetic properties of the samples were studied systematically. We found that x = -0.1 is the optimum composition for the formation of the cubic perovskite phase in Mn4+xC during rapid quenching. Most Mn4+xC melt-spun ribbons with x other than -0.1 are composed of Mn23C6, α-Mn, and Mn4C, while the fraction of different phase in Mn4+xC ribbons varies with x. The Curie temperature of Mn4+xC ribbons increases slightly with decreasing x, which may affect the lattice parameters of cubic Mn4C and thus the Mn-Mn exchange interactions. The magnetization of Mn4+xC (x = -0.1 and 0) increases with increasing temperature in high-temperature region while the onset temperature for such behavior is dependent on the fraction of Mn4C in the samples.