International Journal of Advanced Research in

Science and Technology (IJARST)


Volume 6 - Issue 1 | 2017


01. Graphis subregularis A.W. Archer, a new lichen record for India.

G. Swarnalatha*

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Highlights

The species, Graphis subregularis, a member of the family Graphidaceae, collected from Darjeeling district of West Bengal, is reported here as a new distributional record for India.

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02. A Review on Secure Communication in Fiber-Optic Networks.

T. Jyothi, G. Prashanthi and M. Laksmi Nadh*

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Fiber optic systems are important telecommunication infrastructure for world-wide broadband networks. Wide bandwidth signal transmission with low delay is a key requirement in present day applications. Optical fibers provide enormous and unsurpassed transmission bandwidth with negligible latency, and are now the transmission medium of choice for long distance and high data rate transmission in telecommunication networks. This paper gives an overview of fiber optic communication systems including their key technologies, and also discusses their technological trend towards the next generation.

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03. Antirheumatic plants used by indigenous people of Kawal Wildlife Sanctuary region, Telangana.

Adepu Chandra Mohan, Sateesh Suthari*, Ramesh Kandagatla, Lavudi Harikrishna and Ajmeera Ragan

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The main aim of the study is to document the antirheumatic plants used by the indigenous people of Kawal wildlife sanctuary region. The ethnic people utilize the medicinal plants for the treatment of rheumatic plants. The present study was recorded a total of 22 plant taxa pertaining to 22 genera of 17 families. Of these, Fabaceae dominate with four (4) species and 82% of plant taxa are indigenous and native. 128 key informants were interviewed from 43 villages of the area. Some important and widely used antirheumatic plants include Atalantia monophylla, Azima tetracantha, Calotropis gigantea, Dregea volubilis, Lannea coromandelica and Senna occidentalis.

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04. Biosynthesis of silver nanoparticles using Glycyrrhiza glabra L. leaf and stem extracts and their antibacterial activity.

P. Koteswara Rao*, K. Vijaya Babu, N. Hanumantha Rao, K. Siva Kumar, S. Srinivasulu, R. Ganga Raju, B. Satyanarayana, K. Ravi Kumar, K.P.J. Hemalatha

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Plant extracts have been recently used for nanoparticles green synthesis since they are rich in bioactive compounds. The potential of these compounds present in plant extracts to reduce metal ions to nano particles (NPs) in a single step green synthesis process is very important. In this study, we have reported the synthesis of silver nanoparticles by reducing the silver ions present in the solution of silver nitrate by the cell free aqueous extracts of Glycyrrhiza glabra leaves and stem. Silver nanoparticles (AgNPs) were successfully synthesized using G. glabra extract and the nature of synthesized nanoparticles was analysed by UV-Vis spectroscopy, scanning electron microscopy, X-ray diffraction and Fourier transform infrared spectroscopy. The antimicrobial effect of AgNPs produced by G. glabra was studied against pathogenic bacteria such as Gram positive Bacillus subtilis (MTCC211) and Gram negative Escherichia coli (MTCC443). From the disc diffusion results, the synthesized silver nanoparticles showed an excellent antibacterial property.

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05. Notes on the family Graphidaceae in Sikkim, India.

G. Swarnalatha*

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An account of family Graphidaceae (Graphidoid Graphidaceae) of Sikkim is presented here. A total of 30 species of Graphidoid Graphidaceae spread over five genera are enumerated in this paper. Of these, one species, Graphis inversa, is reported here as a new record for India and 16 species are reported here as new records for the state of Sikkim.

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06. Monotonic and cyclic behavior of Cu-Ni-Si precipitation-hardened alloy used for magnetic pulse technologies.

B. Saadouki* and M. Elghorba

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The compromise mechanical characteristics-electrical conductivity comes first to determine the employment possibilities for precipitation hardening copper alloys. The Cu-Ni-Si alloy as a precipitation hardened alloy exhibits high mechanical characteristics and moderate electrical conductivity. The present work is based on two parts, in the first we studied alloy tensile behavior, in the second we are interested in material response at high cycle fatigue. Cu-Ni-Si has a very good tensile strength of 646 MPa; it displays a very wide plasticizing phase in monotonic stress. Furthermore, the Cu-Ni-Si alloy gives good fatigue resistance in law cycle fatigue as well as in high cycle fatigue with a fatigue limit of 210 MPa.

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07. Redox Reactions of Pentaammine Cobalt (III) Complexes of α-Hydroxy Acids by Nicotinium Dichromate in Micealar Medium.

K. Anji Reddy*, V. Seetaramaiah and Mansur Ahmed

Highlights

The kinetics of one electron transfer mode seems to be unavailable for NDC with Cobalt (III) bound and unbound complexes of α- hydroxy acids in surfactant medium, NDC oxidizes Cobalt (III) bound and unbound α- hydroxy acids. It rules out the synchronous C-C bond fission and electron transfer to Cobalt (III) centre. Oxidation of above complexes increases with increase in temperature. The increase in the rate is observed with increase in the concentration of the surfactant. The added DDAC enhances the rate of oxidation of a reaction much more than ALS. Similar trends have been observed in lactato, glycolato and Mandelato Co (III) complexes.

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08. Damage study of Acrylonitrile Butadiene Styrene test pieces subjected to uniaxial loading.

A. Lamarti*, A. Hachim, Kh. El Had, A. Douraid, and M. Elghorba

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In industrial sectors such as: aeronautics, automotive or general mechanical industries, etc. Mechanical components are subjected to several types of stresses: thermal, chemical, mechanical and cyclical. These constraints cause a progressive degradation of the characteristics of the material, leading to a sudden rupture. For this purpose we have studied the mechanical behavior of an amorphous polymer, Acrylonitrile Butadiene Styrene (ABS), thought uniaxial tensile testing on pierced test pieces and with different notch lengths ranging from 1 to 14 mm. The proposed approach consists in analyzing the evolution of the global geometry of the strain curves obtained by considering the zones and the characteristic points of these curves and also taking into account the effect of the damage on the mechanical behavior of the polymers namely the ABS.

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