International Journal of Advanced Research in

Science and Technology (IJARST)


Volume 6 - Issue 2 | 2017


01. Mechanical behavior and statistic study of Acrylonitrile Butadiene Styrene (ABS) test pieces.

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

Graphical abstract

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Highlights

Amorphous polymers require a great interest thanks to their important industrial applications. This importance is reflected in many studies about their mechanical responses. Among these polymers, Acrylonitrile butadiene styrene (ABS) which has seen significant industrial development as a result of its proprieties. The combination of the three monomers that constitute it from different chemical and physical proprieties provides a material of interest with higher performance.This study is based on the control of the mechanical behavior of the "ABS" polymer, in order to optimize and enhance the mechanical properties of this polymer, another aspect of the characterization that was taken into account is the statistic study. Through this work, we're going to mainly look at the statistic tests of STUDENT distribution and WEIBULL distribution.

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02. Notes on the family Graphidaceae in Darjeeling District of West Bengal, India.

G. Swarnalatha*

Highlights

A total of 36 species of lichen family Graphidaceae belonging to eight genera are recorded from Darjeeling district of West Bengal. Of these, 15 species are reported for the first time from the state of West Bengal.

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03. Sensor placement in the vibration analysis: application to the case of coupling faults.

A.Lamarti*, Kh. El Had and A.Hachim

Graphical abstract

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Highlights

In practice, the recorded vibratory signals are the result of a mixture of different sources corresponding to the various components of the machine, which makes it difficult to interpret the damage state of a particular component and essentially depends of the location choice of the sensors measurement points, we will focus exclusively on accelerometer sensors because these are the sensors most used in vibratory analysis and also those used throughout this study.The objective of our work is to separate various vibratory sources contribution directly related to a failure of a mechanical component, based on several measurements made using the accelerometers, according to an experimental analysis of coupling defects by vibratory analysis.

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04. Studies on callus cultures of Sterculia urens Roxb. and estimation of secondary metabolites.

B. Satyanarayana and P. Subhashini Devi *

Graphical abstract

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Highlights

Callus cultures were initiated from leaf explants of Sterculia urens on MS (Murashige and Skoog, 1962) basal medium supplemented with 0.2mg/lit TDZ and also on MS+0.5BAP+2NAA after 3 weeks. These callus cultures were used to study phytoactive molecules. Preliminary phytochemical investigation of the callus extract showed the presence of the major secondary metabolites like phenolics, tannins, flavonoids, alkaloids, carbohydrates. Quantative analysis reveals that phenolic content of (132.67±4.81), tannins (44.00±4.16), flavonoids (67.33±3.18), alkaloid (35.00±4.36) and carbohydrate content (66.00±6.43) respectively.

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