The growth in the application of electronic devices across a broad spectrum of military, industrial, commercial and consumer sectors has created a new form of pollution known as noise or radio frequency interference (RFI) or electromagnetic radiation or electromagnetic interference (EMI) that can cause interference or malfunctioning of equipment. Therefore, there is a greater need for the effective shielding of components from its adverse effects. This review surveys the shielding materials like metals, conducting plastics and conducting polymers for the control of electromagnetic radiations.

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Millions of dollars are being spent worldwide on the repair and maintenance of sewer systems and wastewater treatment plants. Microbially-induced corrosion causes damage via micro-organisms. Deterioration is caused by acid excretion which etches the surface of concrete, penetrating the mortar surface, especially in sewer systems. The mechanisms of concrete and reinforcement deterioration in sewer environments and microbially-induced corrosion is discussed in detail in this paper. A comprehensive review is given of the role of hydrogen sulphide and micro-organisms in the deterioration of concrete in sewer environments and of repair and rehabilitation measures, including the following preventative measures: (a) modification of the materials used in construction of sewer pipes; (b) coatings; (c) sewer treatments. A complete review of the microbial deterioration of concrete and its remedies is also included.

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This article reports the synthesis, characterization and supercapacitative properties of dodecyl benzenesulphonic acid (DBSA) doped polyaniline(PAni) and its magnetite composites. The synthesized composites are characterized by Uv-Vis, FT-IR, XRD, SEM, electrochemical methods and are evaluated as electrode material for supercapacitor applications. The composites are partially soluble in methanol and are highly dispersible in water. The pristine polyaniline (PAni-DBSA)showed a specific capacitance of 160 F/g, whereas its magnetite(3.8 wt %) composite (C1) and the symmetrical capacitor derived from C1 showed enhanced capacitance of 228 F/g and 180 F/g respectively, at 1 mA/cm 2 .

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