Microstructure Evolution of Extruded Mg-6Gd Alloy Under 175 °C and 150 MPa

The tensile creep behavior of extruded Mg-6Gd alloy, having the tensile yield strength of~110 MPa at 175 °C, has been investigated under 175 °C and 150 MPa. In this study, the extruded Mg-6Gd sample exhibits the total tensile strain of~10.5% after the creep time of 1100 h, and the fast plastic strain of~4.6% at the beginning of the creep test. The microstructure result suggests that the dislocation deformation is the main deformation mode during creep, and the grains with orientation close to〈0001〉|| ED disappear after creep. The creep process containing a low creep strain has no effective promotion for the precipitation compared with the aging process without strain. The origination of creep crack is related to the formation of precipitate-free zone during creep. The work offers an important implication to research the microstructure evolution under an applied stress in a weak aging response Mg alloy.     

Smart City Based Autonomous Water Quality Monitoring System Using WSN

Wireless Personal Communications - Ad-Hoc UWB-IR technology is being researched and exploited in different fields. Some of its potential applications include Military solutions, emergency search...     

Comparative study of catalytic ozonation and Fenton-like processes using iron-loaded rice husk ash as catalyst for the removal of methylene blue in wastewater

This study intends to compare the effectiveness of catalytic ozonation and Fenton-like processes for the decolorization of methylene blue using iron-loaded rice husk ash as catalyst. In both processes, effect of initial pH, adsorption, hydroxyl radical scavenger, and chemical oxygen demand removal was studied. The results revealed that catalytic processes were found to be pH dependent with the highest activity at pH 3.0. Unlike Fenton-like process, catalytic ozonation also found to be effective at pH 7.0. It is therefore, concluded that catalytic ozonation process is more effective than Fenton-like process near wastewater pH values.     

A novel fractional order chaos-based image encryption using Fisher Yates algorithm and 3-D cat map

Multimedia Tools and Applications - This paper presents a novel image encryption scheme using 3-D Arnold cat map and Fisher-Yates shuffling algorithm. A plain image is divided into various slices...     

An experimental investigation to augment the efficiency of photovoltaic panels by using longitudinal fins

The temperature of a photovoltaic (PV) panel has a negative effect on the generated power. As the solar irradiance that falls on the PV increases, the operating PV temperature rises, which leads to a decrease in electrical efficiency. Therefore, there arises a need to introduce a cooling system to minimize PV temperature. In this study, the simple passive cooling method of extending its surfaces with fins was used to reduce the PV temperature. Different numbers of longitudinal aluminum fins were attached to the bottom surface of a PV panel and their effects were examined under realistic weather conditions for Baghdad, Iraq. Results show that the use of the passive cooling method under natural convection will be more effective in reducing PV temperature before solar noon than after solar noon. The maximum power enhancement was about 2.5 W and occurred at solar noon when using 10 aluminum fins. The peak efficiency value of the PV panel with fin cooling was about 15.3% against 14% for the unfinned PV panel.     

Thermal stresses in an infinite circular cylinder

Journal of Mechanical Science and Technology - In the present paper, the problem of dynamic thermal stresses in an infinite elastic cylinder of radius a, with its axis along the z-axis, subject to...