Rajni Sharma

Assessment of environmental profile in the vicinity of Indian cement industry

The present study focuses on an impact assessment of the cement industry on various social, environmental and public health issues. During the study, various socio-environmental issues, such as sex ratio, literacy rate, availability of basic amenities, disease spectrum, land use pattern, crop production, drinking water quality and the effect of emissions on vegetation were thoroughly addressed. Finally, the study also suggests a viable solution for the sustainable development of the cement industry in the particular area. The results show that socio-economic status (e.g. sex ratio, literacy rate and basic amenities) of study area are comparatively below than national average and the people health condition is also poor in the vicinity. Substantial numbers of asthma and tuberculosis patients have been found in study area during field visit. Study also reveals that leaves of dominating plant species in the study area are suffering from necrosis/chlorosis disease.

Characterization of Plasticized PMMA-LiClO4 Solid Polymer Electrolytes

In the present work, the effect of Li salt i.e. LiClO4 contained in composite plasticizer (PC+DEC) with three different concentrations on ionic transport and other electrochemical properties of PMMA based gel polymer electrolytes synthesized has been investigated. The electrolytes have been synthesized by solution casting technique by varying the wt (%) of salt and plasticizer. The formation of polymer-salt complexes and their structural characterization have been carried out by FTIR spectroscopic and XRD analyses. The room temperature ionic conductivity of the electrolyte composition 0.6PMMA-0.125(PC+DEC)-0.15LiClO4 (wt %) has been found to be maximum whose magnitude is 0.40×10-5 S/cm as determined by ac impedance analysis. The temperature dependent ionic conductivity of electrolyte sample0.6PMMA-0.125(PC+DEC)-0.15LiClO4 has further been investigated. Thermal analyses of electrolyte samples of all three compositions have also been done.

Poly(methyl methacrylate) based nanocomposite gel polymer electrolytes with enhanced safety and performance

The study presents preparation of poly methyl methacrylate (PMMA) based nanocomposite gel polymer electrolytes consisting of, salt lithium perchlorate (LiClO4), plasticizer PC/DEC and different proportions of SiO2 nanofiber by solution casting process. The effect of the composition of the electrolytes on their ionic, mechanical and thermal characteristics was investigated. Morphology of the nanocomposite electrolyte films has been observed by scanning and transmission electron microscopes. Interactions among the constituents of the composite and structural changes of the base polymer were investigated by Fourier Transform Infrared (FTIR) spectroscopy and X-ray diffraction (XRD) techniques. The maximum conductivity i.e. 10−3 Scm−1 at room temperature is obtained with the electrolyte composition of 0.6(PMMA)-0.15(PCxa0+xa0DEC)-0.1LiClO4 (wt%) containing 10xa0wt% SiO2 nanofiber and the temperature dependent conductivity data of the electrolyte follows Vogel-Tamman-Fulcher (VTF) behavior.

Stress effects on fundamental frequency of human voice: a review

The work describes the effect of stress on voice parameters. The human voice is a difficult signal to analyse because it changes much over time and is complex in nature. The fundamental frequency is an important parameter of voice and is considered to be one of the most important features to characterise speech and speaker-specific patterns. Stress analysis and voice disease diagnostics essentially require the measurement and analysis of the fundamental frequency of human voice and after that we can take necessary steps for healthcare management.