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Islam, A.K.M. Sadrul,Hasan, R.G.M. Techno-Press 2002 Wind and Structures, An International Journal (WAS Vol.5 No.1
This paper reports the numerical calculations of uniform turbulent shear flow around a square cylinder. The predictions are obtained by solving the two-dimensional unsteady Navier-Stokes equations in a finite volume technique. The turbulent fluctuations are simulated by the standard $k-{\varepsilon}$ model and one of its variant which takes care of the realizability constraint in order to suppress the excessive generation of turbulence in a stagnation condition. It has been found that the Strouhal number and the mean drag coefficient are almost unaffected by the shear parameter but the mean lift coefficient is increased. The present predictions are compared with available experimental data.
Supercapacitor and OER activity of transition metal (Mo, Co, Cu) sulphides
Jansi Rani, B.,Pradeepa, S.S.,Hasan, Zinab M.,Ravi, G.,Yuvakkumar, R.,Hong, S.I. Elsevier 2020 The Journal of physics and chemistry of solids Vol.138 No.-
<P><B>Abstract</B></P> <P>Multifunctional transition metal (Mo, Co, Cu) sulphide electrocatalysts were synthesized employing hydrothermal method with stabilization at 180 °C for 24 h for both supercapacitors and water splitting applications. Rhombohedral (MoS<SUB>2</SUB>) and hexagonal (CoS and CuS) structures of the electrocatalysts were identified from the X-ray diffraction patterns. Raman-active modes confirmed the characteristic phonon vibrations. The prepared sulphides optical studies were examined employing photoluminescence spectroscopy and UV spectroscopy. Morphological variations observed for different sulphide nanostructures were confirmed by the scanning electron microscopy images. A comparative electrochemical study of MoS<SUB>2</SUB>, CoS and CuS was performed. Of the three candidates, MoS<SUB>2</SUB> has superior capacitive behaviour, exhibiting very high specific capacitance of 513F/g at 0.5 A/g, and moreover exhibited the highest oxygen evolution reaction current density of 442.7 mA/g at a scan rate of 10 mV/s. Furthermore, it maintained its performance for longer in 1000 cycles of galvanostatic charging and discharging and in 12 h of an oxygen evolution reaction stability test.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High specific capacitance of 513 F/g at 0.5 A/g was achieved for MoS<SUB>2</SUB>. </LI> <LI> Stability of 98% was achieved for MoS<SUB>2</SUB> after 1000 cycles of galvanostatic charging and discharging. </LI> <LI> A high current density of 442 mA/g was achieved at 10 mV/s. </LI> <LI> After a chronoamperometry test for 12 h, 100% oxygen evolution reaction activity was obtained for MoS<SUB>2</SUB>. </LI> <LI> The MoS<SUB>2</SUB> electrode is highly recommended as an efficient electrode for energy applications. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>