A novel nitrogen-doped graphene (NG)/nickle oxide (NiO) nanocomposite was synthesized by a facile two-step method, where NiO particles were dispersed on the surface of NG. The NG/NiO nanocomposite is characterized by using field-emission scanning electron microscopy (FE-SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and Raman spectroscopy. The electrochemical properties of NG/NiO nanocomposite have been studied using cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) techniques. Compared with the nitrogen-doped graphene, the electrode prepared by NG/NiO nanocomposite has a mass specific capacitance of 342 F g(-1) at scan rate of 5 mV s(-1), which is much higher than that of nitrogen-doped graphene (NG). The galvanostatic charge/discharge results show this new kind nanocomposite has high specific capacitance with 320 F g(-1) in the range of 0.1-0.5 V at a current density of 1 A g(-1). The enhanced supercapacitive performance of NG/NiO nanocomposite suggesting its promising potential in supercapacitors.

In order to investigate the bearing capacity and ductility of concrete-filled square steel tubular (CFSST) with longitudinal stiffeners in condition of instant steel ratio, six specimens, including 1 CFSST, 3 CFSST with single stiffener and 2 CFSST with double stiffeners, were fabricated and tested. And the FEM was established and simulated by ANSYS. The experimental result showed that when the height-thickness ratio of stiffeners was increased, the bearing capacity would be generally decreased but the ductility could be improved. Besides, the specimens performed identical mechanical characteristics while the thickness of steel was the same. And the results of FEM were basically identical to the experiments. Finally, the confinement ξ played a key role to predict the bearing capacity.

Objective: The aim of this study was to analyze the middle-term results of endovascular treatment for Trans-Atlantic Inter-Society (TASC) II D femoropopliteal arterial disease in elderly patients with ulcer and gangrene.