Singh B.K.,GLA University
High Temperatures - High Pressures | Year: 2017
This paper is to show the significance of Callaway's correction term κc for theoretical analysis of lattice thermal conductivity κ of pure LiF, over the temperature range 2-50 K, by using authors adapted Callaway-Holland model. To study the effect of scattering of phonons by crystal boundary alone, different perspectives have been looked into. That includes samples of various sized crystals cleaved from the same isotopically and chemically pure boule. Different empirical expressions for three phonon relaxation rates τ-13 ph - for the entire temperature range, as have been proposed by the author earlier, have been used. Anisotropic and dispersive point defect as well as boundary scattering relaxation rates are used. The main argument of the paper is that κc cannot be neglected as its contribution is even more or nearly equal to the Callaway's Debye term contribution near the conductivity peak. Hence, its inclusion in the calculation of total lattice thermal conductivity κ is the only way to provide the best fitting of the experimental data for crystals of different sizes with simultaneously taking the same three phonon and point defect parameters. It has also been shown that the effect of boundary scattering is sizable even beyond the conductivity maximum, in the case of isotopically pure LiF. This is in contradiction to other researchers who suggest that boundary scattering is only a low temperature phenomenon. Theoretically justified parameters have been used to obtain excellent agreement with the result reported by Thacher. © 2017 Old City Publishing, Inc.
Murti Y.,GLA University
Indian Drugs | Year: 2016
Calotropis procera (Ait.) R. Br. leaves extract was prepared by maceration with using a ethanol as a solvent for seven days. The dried residue was dissolved in water and partitioned with n-butanol to obtained water and n-butanol fraction. The n-butanol fraction collected was subjected to column chromatography. Chloroform, chloroform:methanol (9:1), chloroform:methanol (7:1), chloroform:methanol (1:1) and methanol elutes of n-butanol fraction of ethanolic extract of Calotropis procera (Ait) R.Br, leaves were tested against human hepatoma cell line (HEPG2) by using SRB assay method of in vitro anticancer activity.
Murti Y.,GLA University |
Mishra P.,GLA University
Indian Journal of Pharmaceutical Sciences | Year: 2014
A few flavanones were synthesised by cyclisation of corresponding 3-(heteroaryl)-1(2-hydroxyphenyl) prop-2-en-1-one with sodium acetate in alcohol-water and evaluated for activity. Synthesised compounds were assayed for their in vitro anticancer activity against three human cancer cell lines, mammary adenocarcinoma (MCF7), human colon adenocarcinoma (HT29) and human kidney adenocarcinoma (A498) using sulforhodamine B dye. Results indicated that most of the compounds exhibited significant in vitro anticancer potential. Among them, compound having furan ring showed most potent activity against all the tested cell lines.
Chauhan A.,GLA University |
Saini R.P.,Alternate Hydro Energy Center
Energy | Year: 2017
In the present context, energy access to remote rural households through local energy generating systems has been recognized as a cost effective and extent efficient option. With increased emphasis on eco-friendly technologies and high fuel cost associated with conventional energy generation, the use of renewable energy resources (small hydro, biomass, solar, wind energy etc.) are being explored. The present paper is focused on the optimal sizing of a stand-alone Integrated Renewable Energy System (IRES) which comprises the resources of micro hydro power (MHP), biogas, biomass, solar and wind energy. Initially, a demand response (DR) strategy based on energy consumption scheduling of appliances has been suggested and modelled in the paper. This strategy aims to minimize the peak hourly energy consumption of the study area. Further, different combinations of system components without and with DR strategy were considered and optimized for power reliability criteria of 0% and 5% unmet load. It has been found that significant amount of savings in system sizes and costs are obtained with DR strategy compared to system without DR. © 2017 Elsevier Ltd
Upadhyay P.K.,GLA University |
Mishra P.,GLA University
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2015
Objective: The purpose of this research is to evaluate the antifungal activity of synthesized conjugates of thiophene with 1, 3, 4-oxadiazoles and 1, 3, 4-thiadiazoles using in vitro methods. Methods: The series of (IVa-e) and (Va-e) compounds were synthesized from thiosemicarbazide (IIIa-e) series by treating with iodine-sodium hydroxide mixture and by phosphoric acid cyclization respectively. Thiosemicarbazides (IIIa-e) were prepared by the reaction of 2–amino-4, 5, 6, 7-tetrahydro-benzo[b]thiophene-3-carbohydrazide (II) with substituted isothiocyanates. Carbohydrazide (II) was synthesized by the reaction of hydrazine hydrate with ethyl 2–amino-4, 5, 6, 7-tetrahydrobenzeno[b]thiophene-3-carboxylate (I), which was prepared by one pot synthesis method. Finally, the synthesized compound series was characterized by physicochemical and spectral data (IR, NMR and Mass) and evaluated for in vitro antifungal activity against Candida albicans and Aspergillus niger using disc diffusion method. The percentage inhibition was calculated with reference to the standard drug. Results: The structures of the synthesized conjugates of thiophene with 1, 3, 4-oxadiazoles and 1, 3, 4–thiadiazoles were confirmed by IR, NMR, and Mass spectroscopic techniques. The results of bioassay were indicated that some synthesized compounds IVd, IVe, Vd, and Ve exhibited moderate antifungal activities against Candida albicans and Aspergillus niger; whereas compounds IVb, IVc, Vb, and Vc showed prominent antifungal activities when compared to standard drug, Fluconazole. Conclusion: Present study demonstrates the synthesis of conjugates of thiophene with 1, 3, 4-oxadiazoles and 1, 3, 4–thiadiazoles. These compounds were evaluated for in vitro antifungal activity against Candida albicans and Aspergillus niger using disc diffusion method. The compounds IVd, IVe, Vd, and Ve exhibited moderate antifungal activities, whereas compounds IVb, IVc, Vb, and Vc showed prominent antifungal activities. © 2015, International Journal of Pharmacy and Pharmaceutical Science. All rights reserved.
Sepehri A.,Shahid Bahonar University of Kerman |
Rahaman F.,Jadavpur University |
Pradhan A.,GLA University |
Sardar I.H.,Jadavpur University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015
Recently, Padmanabhan [. arXiv:1206.4916 [hep-th]] argued that the expansion rate of the universe can be thought of as the emergence of space as cosmic time progresses and is related to the difference between the surface degrees of freedom on the holographic horizon and the bulk degrees of freedom inside. The main question arises as to what is the origin of emergence of space in 4D universe. We answer this question in BIonic system. The BIon is a configuration in flat space of a D-brane and a parallel anti-D-brane connected by a thin shell wormhole with F-string charge. We propose a new model that allows that all degrees of freedom inside and outside the universe are controlled by the evolutions of BIon in extra dimension and tend to degrees of freedom of black F-string in string theory or black M2-brane in M-theory. © 2014 The Authors.
Sharma A.K.,Indian School of Mines |
Tiwari A.K.,GLA University |
Dixit A.R.,Indian School of Mines
Renewable and Sustainable Energy Reviews | Year: 2016
A colloidal mixture of nanometre-sized (<100 nm) metallic and non-metallic particles in conventional fluid is called nanofluid. Nanofluids are considered to be potential heat transfer fluids because of their superior thermal and tribological properties. In recent period, nanofluids have been the focus of attention of the researchers. This paper presents a summary of a number of important research works that have been published on rheological behaviour of nanofluids. This review article not only discusses the influence of particle shape and shear rate range on rheological behaviour of nanofluids but also studies other factors affecting the rheological behaviour. These other factors include nanoparticle type, volumetric concentration in different base fluids, addition of surfactant and externally applied magnetic field. From the literature review, it has been found that particle shape, its concentration, shear rate range, surfactant and magnetic field significantly affect the rheological behaviour of any nanofluid. It has been observed that nanofluids containing spherical nanoparticles are more likely to exhibit Newtonian behaviour and those containing nanotubes show non-Newtonian flow behaviour. Furthermore, nanofluids show Newtonian behaviour at low shear rate values while behave as non-Newtonian fluid at high shear rate values. Authors have also identified the inadequacies in the research works so far which require further investigations. © 2015 Elsevier Ltd. All right sreserved.
Pandey P.,GLA University
International Conference on Advanced Computing and Communication Technologies, ACCT | Year: 2013
One of the most valuable asset in any software industry is the correct estimation of effort and hence cost estimation of the software to be developed by them. Because of the highly dynamic nature of the Software development, it becomes more and more difficult to get a correct software effort estimation and software cost estimation, which is one of the most important factor which makes software more competitive and is essential for controlling Software Development Cost. Software Cost Estimation is one of the challenging managerial activity, because values of many of the variables are not known and not easy to predict at an early stage of Software Development. An ideal Software Cost Estimation Model should provide ample confidence, precision and accuracy from its predictions. In this paper, we have performed an analysis of most of the algorithmic techniques which has been developed till now for Software Cost Estimation. We have also tried to analyze the advantages and shortcomings of every technique. © 2013 IEEE.
Verma S.K.,GLA University |
Tiwari A.K.,GLA University
Energy Conversion and Management | Year: 2015
In recent times solar energy has attracted the attention of scientists to a great deal. On the surface, there are two reasons for it: primarily, the scientists are interested in it with the intent to innovating new devices and secondly, developing new methods to harness it. Miniaturization of devices and energy efficiency are the major focal domains around which new materials are being worked on. The design of solar system may get some basic changes, if the new materials get applied successfully. Albeit, the nanofluids are a comparatively recent innovation which exhibit enhanced heat absorbing and heat transport ability. This paper intends to reinforce the working of nanofluids applied on solar system in the light of works done earlier; it further also explores the variable performance of the solar-system with and without application of nano-fluids. This work has been segmented into two parts: the first part focuses on presenting the experimental and numerical results for the thermal conductivity, viscosity, specific heat and the heat transfer coefficient reported by several authors. The second part deals with the application of nanofluids on different types of solar systems: solar collectors, photovoltaic systems, and solar thermoelectric and energy storage system. A study of the works earlier done seems to be suggesting that the nanofluids have great potential to enhance the functioning of various thermal systems. The recent results of the application of nanofluids in PV/T systems too have been consolidating. It can be safely assumed further that it might enhance the overall performance of the solar energy conversion process. © 2015 Elsevier Ltd. All rights reserved.
Pandey P.,GLA University
Proceedings of the 2013 3rd IEEE International Advance Computing Conference, IACC 2013 | Year: 2013
In today's competitive world consideration of maintaining the security of information is must. Nowadays LAN is generally the most common and popular network domain. Network domains are always prone to number of network attacks. One of the most dangerous form of such network attacks is ARP Cache Poisoning also known as ARP Spoofing. ARP is a stateless protocol and ARP Spoofing takes place mainly because it lacks any mechanism of verifying the identity of sending host. It has been seen that most of the LAN attacks results from ARP Spoofing. So prevention, detection and mitigation of this problem can stop number of network attacks. ARP Spoofing is the act of vindictively changing the IP,MAC associations stored in ARP cache of any network host. In this paper we have proposed a probe based technique with an Enhanced Spoof Detection Engine (E- SDE) which not only detects ARP Spoofing but also identifies the genuine IP,MAC association. ARP and ICMP packets have been used as probe packets. Working of E-SDE is explained with the help of algorithm. We have also proposed an attacking model to clearly understand the incremental development of E-SDE to work effectively against most of the type of attackers. We have also measured the network traffic added by the proposed technique. © 2013 IEEE.