Author
R. R. Reddy
Bio: R. R. Reddy is an academic researcher from Sri Krishnadevaraya University. The author has contributed to research in topics: Liquid crystal & Polarizability. The author has an hindex of 8, co-authored 20 publications receiving 167 citations.
Papers
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TL;DR: From the statistical analysis, the PM mass concentration showed a higher abundance of coarse mode particles than the fine mode during pre-monsoon season, and fine mode particles in the PM concentration showed dominance over coarse mode particle contribution during the winter.
Abstract: To better understand the sources as well as characterization of regional aerosols at a rural semi-arid region Kadapa (India), size-resolved composition of atmospheric particulate matter (PM) mass concentrations was sampled and analysed This was carried out by using the Anderson low-pressure impactor for a period of 2 years during March 2013–February 2015 Also, the variations of organic carbon (OC), elemental carbon (EC) and water-soluble inorganic ion components (WSICs) present in total suspended particulate matter (TSPM) were studied over the measurement site From the statistical analysis, the PM mass concentration showed a higher abundance of coarse mode particles than the fine mode during pre-monsoon season In contrast, fine mode particles in the PM concentration showed dominance over coarse mode particle contribution during the winter During the post-monsoon season, the percentage contributions of coarse and fine fractions were equal, whereas during the monsoon, coarse mode fraction was approximately 26 % higher than the fine mode This distinct feature in the case of fine mode particles during the studied period is mainly attributed to large-scale anthropogenic activities and regional prevailing meteorological conditions Further, the potential sources of PM have been identified qualitatively by using the ratios of certain ions A high sulphate (SO4) concentration at the measurement site was observed during the studied period which is caused by the nearby/surrounding mining activity Carbon fractions (OC and EC) were also analysed from the TSPM, and the results indicated (OC/EC ratio of ~42) the formation of a secondary organic aerosol At last, the cluster backward trajectory analyses were also performed at Kadapa for different seasons to reveal the origin of sources from long-range transport during the study period
33 citations
TL;DR: In this article, the authors used the Classius-Mossotti relation to evaluate electronic polarizabilities in semiconductors and alkali halides, and good agreement was observed between the computed and literature values of electronic polarization.
Abstract: Refractive indices have been evaluated from Duffy's optical electronegativities. The validity of the proposed empirical relation has been tested in the case of II-VI, III-V compound semiconductors and alkali halides by comparing the calculated values of n with those in the literature. The estimated refractive indices are used in Classius-Mossotti relation to evaluate electronic polarizabilities in the above compounds. The nature of the bonding in terms of Δ χ * and n is discussed. Good agreement is observed between the computed and literature values of electronic polarizability
24 citations
TL;DR: In this article, the coefficient of volume expansion of the alkyl-cyano-biphenyl liquid crystal CnH2n+1C6H4C 6H44.
Abstract: Dilatometric studies were performed on the nematic and isotropic phases of the homologous series of alkyl-cyano-biphenyl liquid crystals CnH2n+1C6H4C6H4. CN for n = 5 to 9. From these studies the coefficient of volume expansion (a) of the liquid crystal is estimated. Using this data a number of thermoacoustic and an harmonic parameters of the liquid crystal are evaluated. The temperature dependence of these parameters have also been investigated. All these thermoacoustic and an harmonic parameters evaluated in this case show characteristic change in the immediate vicinity of the phase transition temperature.
22 citations
TL;DR: In this paper, a simple relation between energy gap and electronic polarizability is given, which is in good agreement with the values obtained using the Clausius-Mossotti relation.
19 citations
TL;DR: In this paper, the Lippincot-δ-function potential model has been used to evaluate the parallel, perpendicular and mean polarizabilities of two series of nematogenic homologous series.
Abstract: The parallel, perpendicular and the mean polarizabilities of two series of nematogenic homologous series have been evaluated using modified method of Lippincot-δ-function potential model. The results are discussed in relation to reported values. The fair agreement between calculated and reported value of α lends support to the applicability of Lippincot-δ-function model to liquid crystals.
17 citations
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TL;DR: In this article, a study of emission, absorption and vibrational properties of Sm3+ doped lead fluoroborate glasses (PbO-PbF2-B2O3-Sm2O-3) is presented.
174 citations
TL;DR: Reusability results confirmed that the prepared catalyst could be reemployed up to six times, procreating a potentially applicable avenue in biodiesel synthesis.
162 citations
TL;DR: In this article, a Judd-Ofelt approach has been applied for the f − − f transition of Sm3+ ions to evaluate various intensity parameters (Ω2, Ω4, ǫ6), including variations in intensity parameters, radiative transition probabilities and hypersensitive band positions with composition.
138 citations
TL;DR: In this article, simple correlations between the energy gap, optical electronegativity and the refractive index are given for various classes of materials such as semiconductors, insulators and oxides.
122 citations
TL;DR: In this paper, an excellent agreement has been obtained from modified Herve and Vandamme relation and the literature values for the relationship between energy gap, optical electronegativity and refractive index.
119 citations