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Niranjan, K.
- A New Spectrophotometric Method for the Estimation of Total Alkaloids in the Stem Bark and Seed of Holarrhena antidysenterica (Linn.) Wall. and in the Ayurvedic Formulation, Kutajarishta
Authors
Source
Journal of Natural Remedies, Vol 2, No 2 (2002), Pagination: 168-172Abstract
Objective: To develop a spectrophotometric method for the estimation of total alkaloids in the stem bark, seed and formulations of Holarrhena antidysenterica. Materials and methods: A spectrophotometric method based on the formation of coloured complex between tropaeolin 'OO' reagent and alkaloids. Results: The developed method shows good accuracy and reproducibility. Conclusion: The method developed is simple, precise and accurate and can be adopted for the routine quality control purposes.Keywords
Holarrhena antidysenterica, Conessine, Spectrophotometric Method- Finite Element Modeling Analysis on In-Situ Al/TiB2 Metal Matrix Composites
Authors
1 Department of Manufacturing Engineering, Annamalai University, Annamalai Nagar - 608002, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 36 (2016), Pagination:Abstract
Background/Objective: Hardness of Al/TiBM2 Metal Matrix Composites (MMCs) fabricated through in-situ reaction technique is indirectly dependent on pouring temperature. The objective is to predict Hardness through FEA and compare with experimental results. Methods/Statistical Analysis: The Al/TiB2 (MMCs) ingots are obtained by melting A356 Aluminium alloy and mixing calculated amounts of KBF4 and K2TiF6 to yield a maximum of 6% TiB2 reinforcements and cast at different pouring temperature, while maintaining the time of stirring and holding time constant. The Brinell hardness of the resulting material is experimentally found and compared with predicated values by FEA in Ansys software package. Findings: The Hardness of the resulting Al/TiB2 MMCs fabricated increases with pouring temperature and also depends on the stirring time as the KBF4 and K2TiF6 salts are mixed and holding time in the mixed condition. In this study the castings were obtained for different pouring temperatures, but the stirring and holding time kept constant. The fundamental concept of this study is that as the pouring temperature increased the formation of % TiB2 reinforcement increased there by resulting in increased hardness with pouring temperature. The tensile strengths of the samples with different pouring temperature are experimentally found and using this in FEA hardness is predicated. FEA predictions and experimentally found values are found to differ between 7.36% to 10.97% only. The novel finding is that it is possible to predict the hardness theoretically by FEA with a reasonable accuracy of over 90% instead of finding through laborious practical work. Applications/ Improvements: Whenever the Hardness of an Al/TiB2 MMCs is needed it is possible to predict the hardness using FEA-Ansys package if the tensile strength of the material is known. There is no need for laborious practical method to be followed.Keywords
Al/TiB2, Brinell Hardness, Finite Element Analysis, In-situ.- Impact of Storm Time Geomagnetic Parameters on Ionosphere during Solar Minimum Period over Visakhapatnam (17.7° N, 83.3° E), a Low Latitude Station
Authors
1 Department of Physics, Andhra University, Visakhapatnam, Andhra Pradesh, IN
2 Department of Physics, GST, GITAM University, Bengaluru, Karnataka, IN
Source
International Journal of Innovative Research and Development, Vol 5, No 10 (2016), Pagination: 304-310Abstract
The primary energy source of the geomagnetic phenomena is the sun which transfers energy to the earth’s magnetosphere by means of solar wind. As we know that the sun and solar wind form a complex system which can influence the system consisting of earth and magnetosphere with wide variations in their parameters. The response of equatorial and low latitude ionosphere to storms varies from event to event and from place to place, studies on geomagnetic storms and space weather research got wide recognition in the scientific community. As the storms offer an excellent opportunity to study plasma dynamics as well as ionosphere – thermosphere coupling, we proposed to make a comprehensive study on the severe magnetic storms and retrieve the most salient ionospheric effects of the geomagnetic storms. The observations of solar wind variances are imperative for human activity; hence a statistical study of solar wind parameters, solar indices and ionospheric parameters which play an important role in the prediction of geomagnetic storms have been presented for a period of 2006 – 07, a solar minimum year.