Patiala, India
Patiala, India

Thapar University, formerly Thapar Institute of Engineering and Technology, was founded in 1956 by Karam Chand Thapar and is situated in Patiala. Thapar University has grown in size and activities during the last five decades of its existence. It was granted full autonomy and the status of a University in 1985 by the UGC. It was ranked #28 by the Outlook India Top Engineering Colleges of 2012. It was ranked #5 by the limited participation CSR-GHRDC Engineering Colleges Survey 2011.The Thapar University is today recognized among the leading privately managed engineering institutions of the country. NAAC, an Autonomous Institution of UGC, has reaccredited Thapar University and award A Grade. On 24th November, 2014, Thapar University signed an agreement with Trinity College, Dublin as part of its efforts to impart global standard education at its campus in Patiala. Wikipedia.

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An experimental program was carried out to study the properties of self-compacting concrete (SCC) made with coal bottom ash. The mixes were prepared with three percentages (0, 10, 20 and 30) of coal bottom ash as partial replacement of fine aggregates. Properties investigated were; slump flow, J-ring, V-funnel, L-box and U-box, compressive strength, abrasion resistance, rapid chloride permeability, water absorption, and sorptivity. Tests for compressive strength, abrasion resistance, chloride permeability were conducted up to the age of 365 days whereas water absorption and sorptivity tests were conducted up to the age of 28 days. Test results indicated that SCC mixes developed 28-day compressive strength between 25.8 and 35.2 MPa. SCC mixes made with bottom ash exhibited very low chloride permeability resistance (between 381 and 800 C) at the age of 90 and 365 days respectively. Abrasion resistance, water absorption and sorptivity of SCC mixes increased with the increase in bottom ash content at a particular age, however, it decreased with increase in age. © 2013 Elsevier Ltd. All rights reserved.

Siddique R.,Thapar University
Materials and Design | Year: 2011

An experimental program was carried out to study the properties of self-compacting concrete (SCC) made with Class F fly ash. The mixes were prepared with five percentages of class F fly ash ranging from 15% to 35%. Properties investigated were self-compactability parameters (slump flow, J-ring, V-funnel, L-box and U-box), strength properties (compressive and splitting tensile strength), and durability properties (deicing salt surface scaling, carbonation and rapid chloride penetration resistance). SCC mixes developed 28day compressive strength between 30 and 35MPa and splitting tensile strength between 1.5 and 2.4MPa. The carbonation depth increased with the increase in age for all the SCC mixes. Maximum carbonation depth was observed to be 1.67mm at 90days and 1.85mm at 365days for SCC with 20% fly ash content. Also, the pH value for all the mixes was observed to be greater than 11. Deicing salt surface scaling weight loss increased with the increase in fly ash content except with mix containing 15% fly ash. At 365days age, the weight loss was almost consistent for all percentages of fly ash varying between 0.525 and 0.750kg/m2. SCC mixes made with fly ash exhibited very low chloride permeability resistance (less than 700 and 400 Coulomb) at the age of 90 and 365 days respectively. © 2010 Elsevier Ltd.

Siddique R.,Thapar University
Resources, Conservation and Recycling | Year: 2011

Several types of industrial byproducts are generated. With increased environmental awareness and its potential hazardous effects, utilization of industrial byproducts has become an attractive alternative to disposal. One such by-product is silica fume (SF), which is a byproduct of the smelting process in the silicon and ferrosilicon industry. Silica fume is very effective in the design and development of high strength high performance concrete. This paper covers the physical, chemical properties of silica fume, and its reaction mechanism. It deals with the effect of silica fume on the workability, porosity, compressive strength, splitting tensile strength, flexural strength, creep and shrinkage of concrete. © 2011 Elsevier B.V. All rights reserved.

Siddique R.,Thapar University
Resources, Conservation and Recycling | Year: 2012

Solid waste management is the prime concern globally due to ever increasing quantities of waste materials and industrial by-products. Scarcity of land-filling space and because of its ever increasing cost, recycling and utilization of industrial by-products and waste materials has the only option. There are several types of such materials. The utilization of such materials in concrete not only makes it economical, but also helps in reducing disposal concerns. One such material is wood ash (WA). Wood ash (WA) is the residue generated due to combustion of wood and wood products (chips, saw dust, bark, etc.). It is the inorganic and organic residue remaining after the combustion of wood or unbleached wood fiber. This paper details about the physical, chemical, elemental and mineralogical composition of wood ash. It highlights the influence of wood ash on the slump, water absorption, compressive strength, splitting tensile strength, flexural strength, freezing and thawing resistance, and shrinkage of concrete. It also deals with the leaching behavior of wood ash. © 2012 Elsevier B.V. All rights reserved.

Jiwari R.,Thapar University
Computer Physics Communications | Year: 2012

In this paper, an efficient numerical scheme based on uniform Haar wavelets and the quasilinearization process is proposed for the numerical simulation of time dependent nonlinear Burgers' equation. The equation has great importance in many physical problems such as fluid dynamics, turbulence, sound waves in a viscous medium etc. The Haar wavelet basis permits to enlarge the class of functions used so far in the collocation framework. More accurate solutions are obtained by wavelet decomposition in the form of a multi-resolution analysis of the function which represents a solution of boundary value problems. The accuracy of the proposed method is demonstrated by three test problems. The numerical results are compared with existing numerical solutions found in the literature. The use of the uniform Haar wavelet is found to be accurate, simple, fast, flexible, convenient and has small computation costs. © 2012 Elsevier B.V. All rights reserved.

The static nucleus-nucleus potential and the energy-dependent nucleus-nucleus potential are used to address the sub-barrier fusion reactions. Thestatic nucleus-nucleus potential systematically fails to recover the experimental data of 32;36 16S+90 40Zr systems. However, the energy-dependent Woods-Saxon potential model (EDWSP model) in conjunction with the one-dimen-sional Wong formula accurately addresses the sub-barrier fusion enhancement of these systems. The role of the inelastic surface excitations of collision partners in the fusion dynamics is entertained within the context of coupled channel calculations performed by using coupled channel code CCFULL. It is worth noting here that the energy dependence in nucleus-nucleus potential simulates the effects of inelastic surface excitations of colliding nuclei in the sub-barrier fusion enhancement of 32;3616S+90 40Zr systems.

Gautam M.S.,Thapar University
Canadian Journal of Physics | Year: 2015

This article analyzes the validity of static Woods-Saxon potential and the energy-dependent Woods-Saxon potential (EDWSP) to explore the specific features of fusion dynamics of C 6 12 +P 78 194,198 t and L36i+P82 208 b systems. The intrinsic degrees of freedom, such as inelastic surface excitations, play a crucial role in the enhancement of sub-barrier fusion excitation functions over the expectations of the one-dimensional barrier penetration model. Role of dominant intrinsic degrees of freedom of collision partners are entertained within the context of coupled channel calculations. Furthermore, the one-dimensional Wong formula using static Woods-Saxon potential fails miserably to describe the fusion enhancement ofC6 12 +P78 194,198 t and L36i+P82 208 b systems. However, the Wong formula along with the EDWSP model accurately explains the observed fusion enhancement of C6 12 +P78 194,198 t reactions. In the fusion ofL36i+P82 208 b reaction, the above-barrier fusion data are suppressed by a factor of 0.66 with reference to the EDWSP model calculations while the below-barrier fusion data are adequately addressed by the EDWSP model and the coupled channel calculations. Therefore, the coupled channel calculations and the EDWSP model calculations reasonably describe the observed fusion mechanism ofC6 12 +P78 194,198 t and L36i+P82 208 b reactions. This suggests that the energy dependence in the Woods-Saxon potential model introduces similar kinds of barrier modification effects (barrier height, barrier position, and barrier curvature) as reflected from the coupled channel calculations. In the EDWSP model calculations, significantly larger values of diffuseness ranging from a = 0.86 to 0.94 fm, which is much larger than a value extracted from the elastic scattering analysis, are needed to address the sub-barrier fusion data. © 2015 Published by NRC Research Press.

Kumar R.,Thapar University
Physical Review C - Nuclear Physics | Year: 2012

The systematic study of doubly closed shell 208Pb-daughter cluster radioactivity using different versions of proximity potentials within the preformed cluster-decay model is extended to daughter nuclei other than 208Pb. The nuclear proximity potentials used in the calculation of total interaction potential cover a wide range of barrier characteristics. The decay half-life of the cluster changes significantly with the use of these different potentials because of the corresponding change in the preformation probability (P 0) and penetration probability (P) of the cluster. The cluster radioactivity is worked out at touching as well as at an elongated neck configuration by taking the neck-length parameter ΔR=0.5 fm. In order to observe the effect of deformation, the spherical fragmentation of clusters is also taken into account and the standard root-mean-square (rms) deviation is also compared for the various nuclear proximity potentials. It is observed that Prox 1977 reproduces the experimental half-lives very well at ΔR=0.5 fm and further improves upon the value obtained in previous work. Thus Prox 1977 turns out to be a better option for studying the cluster decay of radioactive nuclei; however, the calculated half-lives of 14C clusters are still poor. With the use of mod-Prox 1988, having stronger isospin and asymmetry dependence, the comparison for 14C clusters improves significantly and the standard rms deviation from experimental half-lives comes out to be 1.01 and 1.46 for spherical and deformed choices of fragmentation, respectively. The standard rms deviation reported for various proximity potentials can be further improved if the precise experimental half-lives of 15, out of the 45 clusters used in present study, are made available. Till now only lower limits are available for these clusters. The barrier characteristics of various interaction potentials obtained using different nuclear proximity potentials are also explored in the context of ground-state cluster radioactivity. The new cases of 34Si decay of 238U and 14C and 15N decays of 223Ac are also included in the present study of 45 clusters. Predictions of half-lives of possible cluster decays in the trans-lead region are also made using Prox 1977. The deformation effect is included with optimum cold orientations. © 2012 American Physical Society.

Singh S.,Thapar University | Kaler R.S.,Thapar University
IEEE Photonics Technology Letters | Year: 2013

An efficient gain-flattened L-band optical amplifier is demonstrated using a hybrid configuration with a distributed Raman amplifier (DRA) and an erbium-doped fiber amplifier (EDFA) for 160 × 10-Gb/s dense wavelength division multiplexed system at 25-GHz interval. With an input signal power of 3 mW, a flat gain of > 10 dB is obtained across the frequency range from 187 to 190.975 THz with a gain variation of < 4.5 dB without using any gain-flattening technique. The output power obtained at 3-mW optimum input power is also the highest value (> 8.9 dBm) ever reported for a DRA-EDFA hybrid optical amplifier at reduced channel spacing. © 2012 IEEE.

This paper addresses the validity of the static Woods-Saxon potential and the energy dependent Woods-Saxon potential (EDWSP) for description of sub-barrier fusion dynamics. The low lying surface vibrations of colliding nuclei and neutron transfer channels are found to be major factors responsible for fusion enhancement at sub-barrier energies. Theoretical calculations based upon the static Woods-Saxon potential obtained using the one-dimensional Wong formula fail to explain the energy dependence of the sub-barrier fusion cross-section of 2040Ca +2246,48,50Ti systems. The role of inelastic surface vibrations is properly entertained within the context of coupled channel calculations performed using the CCFULL code. However, the EDWSP model, in conjunction with the one-dimensional Wong formula, accurately explains the sub-barrier fusion enhancement of 2040Ca + 2246,48,50Ti systems and simulates the influence of nuclear structure degrees of freedom, such as the inelastic surface vibrational states of colliding pairs. In EDWSP model calculations, a wide range of diffuseness parameters, ranging from a = 0.96 fm to a = 0.85 fm, which is much larger than a value (a = 0.65 fm) extracted from the elastic scattering data, is required to bring the observed fusion enhancement. © 2015 The Royal Swedish Academy of Sciences.

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