Nehru Memorial College

Puthanampatti, India

Nehru Memorial College

Puthanampatti, India
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Umadevi M.,Nehru Memorial College | Muthuraj V.,Vhnsn College
Journal of Molecular Structure | Year: 2017

The paper presents a combined experimental and computational study of new compound morpholiniumtetrachloropalladate(II) (MTCP) which has been synthesized and characterized by FT-IR, UV–Vis and single crystal X-ray diffraction studies. The solid phase FT-IR spectra of the complex salt have been recorded in the regions 4000-400 cm−1. Density functional (DFT and TD-DFT) calculations have been carried out for this complex by using DFT/LANL2DZ functional with the basis set of SDD for Palladium and 6-311G+(d,p) for C, N, H, O and Cl atoms. The calculated results show that the predicted geometry can well reproduce the structural parameters. The complex formed by a discrete PdCl4 2− anion and one protonated C4H10NO+ cation and the Pd (II) ion is located on an inversion center and is coordinated by four chlorine in a square planar geometry. © 2017 Elsevier B.V.

Krishnakumar V.,Periyar University | Sangeetha R.,Nehru Memorial College | Mathammal R.,Salem College | Barathi D.,Nkr Government Arts College W
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

This work deals with the vibrational spectra of 2-fluoro 5-nitrotoluene and 2-bromo 5-nitrotoluene by quantum chemical calculations. The solid phase FTIR and FT-Raman spectra of the title compounds were recorded in the regions 4000-400 cm-1 and 4000-50 cm-1 respectively. The spectra were interpreted with the aid of normal co-ordinate analysis based on density functional theory (DFT) using standard B3LYP/6-31G* basis set for the most optimized geometry. The vibrational frequencies are calculated and scaled values are compared with experimental FTIR and FT-Raman spectra. The scaled theoretical wave numbers showed very good agreement with the experimental ones. The complete vibrational assignments are performed on the basis of the total energy distribution (TED) of the vibrational modes, calculated with scaled quantum mechanical (SQM) method. 13C and 1H NMR chemical shifts results are compared with the experimental values. © 2012 Elsevier B.V. All rights reserved.

Viji Saral Elezabeth D.,Nehru Memorial College | Ramachandran P.,Nehru Memorial College
International Journal of Pharmaceutical and Clinical Research | Year: 2014

This study was to evaluate the antimicrobial activity of petroleum ether extract of Bauhinia blakeana (Family-Fabaceae) flowers against selected microbes and it was obtained by continuous hot percolation method: Antimicrobial activity was evaluated by Agar well diffusion method. This investigation revealed the petroleum ether extract showing significant Antimicrobial activity against the selected microbes. Hence, we can conclude that the flower extract of Bauhinia blakeana was possessing Antimicrobial potential.

Seethalakshmi R.,SASTRA University | Saavithri V.,Nehru Memorial College
International Journal of Applied Engineering Research | Year: 2015

A new class of mixture distribution is derived by mixing Normal and Lehmann Type I Exponential distribution. Properties of the distribution are given and the unknown parameters are estimated by the method of maximum likelihood estimation. The distribution is shown to be a better fit than the scale mixture of normal distribution of Andrews and Mallows (1974). © Research India Publications.

Thilagavathi G.,Nehru Memorial College | Arivazhagan M.,Aagovt Arts College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

The solid phase FTIR and FT-Raman spectra of 2-amino-4,6-dimethyl pyrimidine (ADMP) have been recorded in the regions 4000-400 cm-1 and 3500-50 cm-1 respectively. The structure was investigated by utilizing density functional theory (DFT) calculations with the Becke 3-Lee-Yang-Parr (B3LYP) method employing the 6-31+G and 6-311++G basis sets. The optimized geometrical parameters obtained by B3LYP method show good agreement with experimental data. Complete vibrational assignments were made on the basis of normal coordinate analysis (NCA) for the molecule. The infrared and Raman spectra were also predicted from the calculated intensities. The observed and the calculated spectra were found to be in good agreement. The thermodynamic properties like entropies and their correlations with temperatures were also obtained from the harmonic frequencies of the optimized structures. © 2011 Elsevier B.V. All rights reserved.

Chandrasekar V.K.,SASTRA University | Gopal R.,Bharathidasan University | Gopal R.,Nehru Memorial College | Venkatesan A.,Nehru Memorial College | Lakshmanan M.,Bharathidasan University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We identify the mechanism behind the existence of intensity-induced chimera states in globally coupled oscillators. We find that the effect of intensity in the system is to cause multistability by increasing the number of fixed points. This in turn increases the number of multistable attractors, and we find that their stability is determined by the strength of coupling. This causes the coexistence of different collective states in the system depending upon the initial state. We demonstrate that intensity-induced chimera is generic to both periodic and chaotic systems. We discuss possible applications of our results to real-world systems like the brain and spin torque nano-oscillators. © 2014 American Physical Society.

Gopal R.,Bharathidasan University | Chandrasekar V.K.,Bharathidasan University | Venkatesan A.,Nehru Memorial College | Lakshmanan M.,Bharathidasan University
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

By developing the concepts of strength of incoherence and discontinuity measure, we show that a distinct quantitative characterization of chimera and multichimera states which occur in networks of coupled nonlinear dynamical systems admitting nonlocal interactions of finite radius can be made. These measures also clearly distinguish between chimera or multichimera states (both stable and breathing types) and coherent and incoherent as well as cluster states. The measures provide a straightforward and precise characterization of the various dynamical states in coupled chaotic dynamical systems irrespective of the complexity of the underlying attractors. © 2014 American Physical Society.

Viji Saral Elezabeth D.,Nehru Memorial College | Ramachandran P.,H+ Technology
International Journal of Pharma and Bio Sciences | Year: 2015

Indian medicinal plants are playing an important role in the traditional healing system. Vetiveria lawsonii is the most important plant belongs to Poaceae family with great medicinal value. This study was aimed to investigate the microbiological activity of Vetiveria lawsonii. The various extracts of Vetiveria lawsonii were prepared by soxhlet extraction method using acetone, benzene, chloroform, ethanol, methanol and n-Hexane. The results were confirmed methanol extracts of Vetiveria lawsonii showing significant activity against selected microbes than other extracts. We recommend further research on this plant for possible pharmacological investigation of the various chemical active substances.

Thaila T.,Nehru Memorial College | Kumararaman S.,Nehru Memorial College
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2011

The nonlinear optical single crystals of doped sulphamic acid (SA) were grown from aqueous solution by doping with NaCl and KCl using slow evaporation method. Powder X-ray diffraction studies confirm that the grown crystals belong to orthorhombic system. The density and melting point measurements of the grown crystals were determined by floatation technique and capillary tube method, respectively. The range of optical transmittance was ascertained by recording the UV-Vis-NIR spectrum. Atomic absorption study reveals the presence of dopants in the doped crystals. The thermal analyses indicated that the doped SA crystals are more stable than pure crystals. The Vicker's microhardness studies revealed that the dopants increased the hardness of the crystals. SHG efficiency studies of the crystals are found to be increased in the presence of NaCl and KCl dopants. © 2011 Elsevier B.V. All rights reserved.

Amlarethinam D.I.G.,Jamal Mohamed College | Geetha J.S.,Nehru Memorial College
Proceedings - 2014 World Congress on Computing and Communication Technologies, WCCCT 2014 | Year: 2014

The efficiency of cryptographic algorithm is not only based on the time taken for encryption and decryption, but also the number of levels used to get the cipher text from a plain text. The public key cryptosystem RSA is one of the widely used algorithms. However, several attacks are introduced to break this algorithm due to certain limitations. Also, it may not be guaranteed that the cipher text is fully secured. One of such limitations in the past cryptosystem is using ASCII characters for numerical representation of the text. To overcome the above said limitation, an innovative algorithm namely Magic Rectangle Generation Algorithm (MRGA) is being proposed in this work. It is helpful to enhance the security due to its complexity in encryption process. The singly even magic rectangle is formed based on the seed number, start number, row sum and column sum. The value of row sum and column sum is very difficult to be traced. The proposed work introduces one more level of security in public key algorithms such as RSA, ElGAMAL etc. Finally, MRGA helps to overcome the weakness of public key cryptosystem. Cipher text developed by this method can be entirely different when compared to the plain text and will be suitable for the secured transmission over the internet. © 2014 IEEE.

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