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Thiruvananthapuram, India

The Indian Institute of Space Science and Technology is a government aided institute and deemed university for the study and research of space science, located at Valiamala, Thiruvananthapuram, Kerala. It is the first university in Asia to be solely dedicated to the study and research of Outer Space. It was inaugurated on 14 September 2007 by G. Madhavan Nair, the then Chairman of ISRO. IIST is sponsored by the Indian Space Research Organisation under the Department of Space, Government of India. A. P. J. Abdul Kalam, former President of India, is the Chancellor of IIST.IIST offers regular engineering undergraduate courses and graduate programs including master's and doctorate degrees. IIST is rated as one of the most prestigious engineering institutes in India admitting a little more than 150 students to its undergraduate courses every year. All undergraduate students are granted full scholarships during the entire four-year period. Complete boarding and lodging are offered to the students inside the campus at no cost, provided they meet prescribed academic standards. The students meeting these standards are then recruited as scientists and engineers in the Department of Space facilities and Indian Space Research Organization centres all over India. Wikipedia.

Ravi V.,Indian Institute of Space Science and Technology
Journal of Cleaner Production | Year: 2012

Primary constituents of e-waste from end-of-life (EOL) computers consist of glass, metals and plastics. Thus the quality of recycling of e-waste is dependent upon individual indicators like cathode ray tube (CRT) recycling, plastics recycling and recovery of metals which in turn is dependent upon various other attributes. The problem of assigning a single overall measure of quality to each system in a set of similar EOL computers recycling systems has not been duly addressed in literature. An aggregate measure of total quality of recycling system for EOL computers would be helpful to top management in accessing overall development where different versions of recycled products are produced. Thus, the central idea in this research is to combine different types of recycling process parameters into an aggregate value representing the overall quality of recycling of each of the systems. In this research, we have used Multi-Attribute Global Inference of Quality (MAGIQ) technique for accomplishing this objective. Results of research conducted in a case company show that application of this technique can provide decision makers with a clear picture on the quality of various recycling systems under evaluation. © 2011 Elsevier Ltd. All rights reserved.

Cyriac J.,Indian Institute of Technology Madras | Cyriac J.,Purdue University | Cyriac J.,Indian Institute of Space Science and Technology | Pradeep T.,Indian Institute of Technology Madras | And 3 more authors.
Chemical Reviews | Year: 2012

A study was conducted to demonstrate low-energy ionic collisions at molecular solids. The investigations were limited to molecular surfaces and associated chemical processes occurring during impact of a hyperthermal energy ion. The term 'molecular solid' comprised the wide range of molecular materials that were used in ion/surface collision experiments. The energy regime considered in the investigations lied in an intermediate range. Primary ion energies of several kiloelectronvolts used in a secondary ion mass spectrometry (SIMS) experiment was considered in the case of condensed molecular solids to allow correlation with the results of chemical sputtering (CS) or other low-energy sputtering (LES) experiments.

Gupta N.,Indian Institute of Space Science and Technology | Gupta N.,Raman Research Institute
Astroparticle Physics | Year: 2012

The PeV gamma ray background produced in the interactions of ultra high energy cosmic rays with the ambient matter and radiations during their propagation in the Milky Way has been calculated in this paper. If the primary ultra high energy cosmic rays are produced from Galactic point sources then those point sources are also emitting PeV gamma rays. We discuss that the detection of galactocentric PeV gamma rays in the future would be a signature of the presence of EeV cosmic accelerators in the Milky Way. © 2011 Elsevier B.V. All rights reserved.

Amarnath M.,Indian Institute of Information Technology, Design and Manufacturing | Praveen Krishna I.R.,Indian Institute of Space Science and Technology
Measurement: Journal of the International Measurement Confederation | Year: 2014

Gear is a vital transmission element, finding numerous applications in small, medium and large machinery. Excessive loads, speeds and improper operating conditions may cause defects on their bearing surfaces, thereby triggering abnormal vibrations in whole machine structures. This paper describes the implementation of empirical mode decomposition (EMD) method for monitoring simulated faults using vibration and acoustic signals in a two stage helical gearbox. By using EMD method, a complicated signal can be decomposed into a number of intrinsic mode functions (IMF) based on the local characteristic time scale of the signal. Vibration and acoustic signals are decomposed to extract higher order statistical parameters. Results demonstrate the effectiveness of EMD based statistical parameters to diagnose severity of local faults on helical gear tooth. Kurtosis values from EMD and that obtained from vibration and acoustic signals are compared to demonstrate the superiority of EMD based technique. © 2014 Elsevier Ltd. All rights reserved.

Mukthar Ali M.,Indian Institute of Space Science and Technology | Sandhya K.Y.,Indian Institute of Space Science and Technology
Carbon | Year: 2014

Titanium dioxide (TiO2)-fullerene (C60) composite is prepared from TiO2 and β-cylcodextrin (CD) encapsulated C 60 using the solar light irradiation. The absorption of the composite extends to the visible light region due to the charge transfer from CD and C60 to TiO2. The composite shows reduced charge recombination compared to that of the bare TiO2 and TiO 2/CD. The rate constant values for the photodegradation reactions of methylene blue and 4-chlorophenol (4-CP) are significantly higher (∼2-5 times) for the composites with 0.5 and 1.5 wt.% C60 compared to that of the bare TiO2. Photocatalytic studies in the presence of scavengers reveal that the composites produce higher amount of reactive oxygen species (ROS). The enhanced photocatalytic activity of the composites is attributed to the visible light responsiveness, reduced charge recombination and increased formation of ROS. The photodegradation of 4-CP is significantly faster in the presence of the composite with 1.5 wt.% C60 and is attributed to the synergistic effect of higher adsorption and increased ROS formation. The ROS formation by C60 is possible because of the non-aggregated state of C60 molecules in the composite and is assigned to the method which employs CD molecules to disperse C60 in the composite. © 2013 Elsevier Ltd. All rights reserved.

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