K. Jayaraman - Academia.edu (original) (raw)

Papers by K. Jayaraman

online ordering: http://www.ntis.gov/ordering.htm Printed on paper containing at least 50% wastep... more online ordering: http://www.ntis.gov/ordering.htm Printed on paper containing at least 50% wastepaper, including 20% postconsumer waste i Acknowledgments The editors of this report would like to acknowledge the contributions of a variety of participants, funders, and reviewers. Specifically, we would like to acknowledge the interest and support of Eric Smith of the U.S. Environmental Protection Agency (EPA) and key Department of Energy (DOE) Office of Energy Efficiency and Renewable Energy (EERE) staff, including Darrel Beschen, Sam Baldwin, and Michael Leifman (now with GE Energy). The editors would also like to thank Fred Beck of Sentech for his input.

Indian journal of biochemistry & biophysics, 1981

Flax fibre reinforced polymer tube encased coconut fibre reinforced concrete (FFRP-CFRC) composit... more Flax fibre reinforced polymer tube encased coconut fibre reinforced concrete (FFRP-CFRC) composite is a stay-in-place structural system which exhibited excellent axial and lateral static load carrying capacities. In FFRP-CFRC composites, the pre-fabricated FFRP tubes act as permanent formwork for fresh fibre reinforced concrete and also provide confinement to concrete core to enhance concrete compressive strength and ductility. Coir inclusion in concrete modifies the failure mode of the composite and provides a more ductile behaviour due to fibre bridging effect and also increases the damping of the composite. In this study, FFRP-CFRC column without steel reinforcement was fabricated. The seismic performance of this composite column was investigated to simulate as a scaled bridge pier. Snap back and harmonic load tests were performed to identify the fundamental frequencies and damping ratios. This study demonstrates the potential of using this environmentally-friendly FFRP-CFRC as new structural materials to enhance dynamic performance and reduce seismic impact on structures.

Key Engineering Materials, 1996

Iutam Symposium on Multi-Functional Material Structures and Systems, 2010

Honeycomb core sandwich panels have found extensive applications particularly in the aerospace an... more Honeycomb core sandwich panels have found extensive applications particularly in the aerospace and naval industries. In view of the recent interest in alternative, yet strong and lightweight materials, honeycomb cores are manufactured from sisal fiber-reinforced polypropylene (PP) composites and the out-ofplane compressive behaviour of these cores is investigated. The cell wall material is modeled as a linear elastic, orthotropic plate/lamina and also as a linear elastic, quasi-isotropic material. The failure criteria for the reinforced honeycombs are theoretically developed. Failure maps that can be used for the optimal design of such honeycombs are constructed for a wide range of honeycomb densities. The results indicate a significant improvement in the load carrying capacity of the honeycomb cores after fiber reinforcement.

Nucleosides and Nucleotides, 1993

Preparation of G-rich TFOs containing cholesterol at the end presents challenging problems due to... more Preparation of G-rich TFOs containing cholesterol at the end presents challenging problems due to low yield in synthesis and loss in purification due to aggregation. These compounds also have low solubility which can result in variability in their uptake properties and cellular efficacy. To overcome these problems we have designed and synthesized cholesteryl -CPG (6) and -TentaGel (7) supports and phosphoramidite (8) containing a triglycyl linker.

Tourism Economics, 2011

ABSTRACT The Malaysian tourism industry has flourished considerably over the years due to the gro... more ABSTRACT The Malaysian tourism industry has flourished considerably over the years due to the growth of new tourist landmarks, together with its rich cultural heritage. The industry generated 6.78% of the total income from exports in 2008. This paper focuses on the dynamic relationship between macroeconomic factors and tourism revenue in Malaysia from January 2002 to December 2008. In this context, the authors investigate the presence of seasonal fluctuations in tourism revenue and examine the macroeconomic factors influencing the five top tourist-generating countries for Malaysia.

Tetrahedron Letters, 1993

Abstract Total synthesis of novel DMT-phosphoramidites of thymidine (11 and 15) and 2′-deoxyguano... more Abstract Total synthesis of novel DMT-phosphoramidites of thymidine (11 and 15) and 2′-deoxyguanosine (8 and 20) have been accomplished. The utility of these modified building blocks in the preparation of triple helix forming oligodeoxyribonucleotides with a stretched ...

Proceedings of the Combustion Institute, 2011

... References. [1] K. Jayaraman, KV Anand, DS Bhatt, SR Chakravarthy and R. Sarathi, J. Propul. ... more ... References. [1] K. Jayaraman, KV Anand, DS Bhatt, SR Chakravarthy and R. Sarathi, J. Propul. Power 25 (2) (2009), pp. 471481. Full Text via CrossRef | View Record in Scopus | Cited By in Scopus (1). [2] NS Cohen, AIAA J. 21 (5) (1983), pp. 720725. Full Text via CrossRef |.

Proceedings of the Combustion Institute, 2013

ABSTRACT Sixteen propellant formulations based on ammonium perchlorate (AP), hydroxyl-terminated ... more ABSTRACT Sixteen propellant formulations based on ammonium perchlorate (AP), hydroxyl-terminated polybutadiene, and aluminium particles have been tested for size distribution of aluminium agglomerates emerging from their burning surface. The formulations are based on a bimodal size distribution of AP particles. Ten of the formulations exhibit one or two plateaus/mesa in their burning rate variation with pressure (zero/negative pressure exponent of burning rate). The relevant formulation variables, namely, coarse and fine AP sizes and coarse-to-fine ratio, aluminium size and content, and two different curing agents, have been varied. Tests are performed in the 1–10 MPa pressure range. A direct correlation between burning rate and agglomerate size exists for propellants with normal burning rate trends but a neutral or inverse correlation is observed for those exhibiting plateau burning behaviour. Larger the parent aluminium size, lesser the agglomeration, as expected; but the effect of aluminium content is non-monotonic. The coarse AP size influences the aluminium agglomerate size as expected from the pocket model regardless of plateau burning effects. The agglomerate size decreases with increase in fine AP size, however. A computer model developed earlier at this laboratory for prediction of aluminium agglomerates based on three-dimensional packing of particles and deduction of AP particles with attached leading edge diffusion flames is applied to the present formulations. The model under-predicts the agglomerate size, only marginally for propellants that do not exhibit plateau burning rate trends, but substantially, otherwise. This is because it does not take into account effects of binder melt flow and is independent of the curing agent of the binder.

Polymer Composites, 1993

... condition may be warranted at the interface between a permeable medium and a flowing liquid, ... more ... condition may be warranted at the interface between a permeable medium and a flowing liquid, as pointed out by Beavers and Joseph (18 ... of the lubrication flow model are solved by a semi-implicit Runga-Kutta method with variable step size, follow-ing Villadsen and Michelsen ...

Polymer Composites, 1996

ABSTRACT The consolidation and relaxation characteristics of glass mat reinforcements with a ther... more ABSTRACT The consolidation and relaxation characteristics of glass mat reinforcements with a thermoplastic polyester binder have been studied. Attention has been given to the effect of preforming conditions on binder flow around the fibers, and on the rearrangement of fiber tows making up the preform. An instrumented hydraulic press was used to compress stacks of glass mat over a wide range of temperatures (51.7 to 176.7°C) and a range of platen closing speeds (0.02 to 2.00 mm/s). Scanning electron microscopy was used to examine the fiber tows after deformation. Individual fiber tows were observed to flatten during compression, more so at higher temperatures and slower closing speeds. The scanning electron micrographs also reveal changes in binder distribution around the fiber tows that are closely related to the degree of flattening of the fiber tows. This is because small gaps are opened up within the tow as it is flattened. Flow of binder along such gaps is predominantly due to the squeezing force, with only a minor contribution from capillary forces. The redistribution of binder then facilitates further compaction. The extent of binder redistribution is also governed by the binder viscosity, which was found to be a strong function of strain rate and temperature. The shear thinning viscosity of the binder leads to greater compressibility at the highest closing speed of 2 mm/s, although the compressibility of the mats was lower at moderately higher closing speeds. The compressibility was also higher at higher temperatures as expected. The loft was greater for stacks pressed at higher temperatures; this is a consequence of the lower binder viscosity at higher temperatures allowing more rearrangement of the tows. There was no loss of binder from the stacks in these runs.

$Research paper thumbnail of Search for Excited States in ^{3}He$

Physical Review C, 1971

A search has been made for excited states in 3He by investigating proton-induced reactions on 6Li... more A search has been made for excited states in 3He by investigating proton-induced reactions on 6Li. The investigation consisted of two parts. In the first part, a kinematically incomplete experiment, the 3He and alpha-particle continua from the 6Li(p,3He) and 6Li(p,alpha) reactions at an incident proton energy of 45.0 MeV have been studied for structure due to excited states in 4He

Parasitology International, 1998