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TIET Articles Published in this Week and Indexed in SCI

(Published On 4th January 2019 )


Record 1 of 11

Effect of addition of silicone oil on the rheology of fumed silica and polyethylene glycol shear thickening suspension

 

Authors: Singh, M; Verma, SK; Biswas, I; Mehta, R

JOURNAL OF POLYMER ENGINEERING 

Volume: 39     Issue: 1     Pages: 48-57     Published: JAN 2019      Language: English       Document type: Article

DOI: 10.1515/polyeng-2018-0054

 

Abstract:

Shear thickening fluids (STF) are stabilized and concentrated colloidal suspensions of hard nano-particles in a liquid medium (polymer) that, under the influence of impact forces, show non-Newtonian fluid behavior (shear thickening) dissipating the energy of impact. The viscosity of the dispersion medium should be optimum to lead to an increase in shear thickening, and at the same time, should also allow proper dispersion of the particles. Herein, an STF based on 20 wt% fractal nano-fumed silica particles of 11 nm suspended in a liquid medium of polyethylene glycol (PEG 200) with different concentrations of silicone oil was prepared. These systems were studied in terms of steady-state and dynamic-state rheological behavior under a wide range of temperature, shear rate, strain rate and frequency. The STF with replacement of up to only 20% of PEG with silicone oil as the liquid medium shows a large increase (about four times) in shear thickening parameters when compared with STF containing only PEG under the same processing conditions. It also shows more elastic behavior at high frequencies which are due to the high cross-linking property of silicone oil, contributing to much-improved properties, which are highly desirable from the view point of many applications.

 

 


 

Record 2 of 11

Thermal degradation kinetics of oxo-degradable PP/PLA blends

 

Authors: Mandal, DK; Bhunia, H; Bajpai, PK

JOURNAL OF POLYMER ENGINEERING 

Volume: 39     Issue: 1     Pages: 58-67     Published: JAN 2019      Language: English       Document type: Article

DOI: 10.1515/polyeng-2018-0073

 

Abstract:

In this article, the influence of polylactide and pro-oxidant on the thermal stability, degradation kinetics, and lifetime of polypropylene has been investigated using thermogravimetric analysis under nitrogen atmosphere at four different heating rates (i.e. 5, 10, 15, and 20 degrees C/min). The kinetic parameters of degradation were studied over a temperature range of 30-550 degrees C. The derivative thermogravimetric curves have indicated single stage and two stage degradation processes. The activation energy was evaluated by using the Kissinger, Kim-Park, and Flynn Wall methods under the nitrogen atmosphere. The activation energy value of polypropylene was much higher than that of polylactide. Addition of polylactide and prooxidant in polypropylene decreased the activation energy. The lifetime of polypropylene has also decreased with the addition of polylactide and pro-oxidant.

 

 


 

Record 3 of 11

UAVs assisted queue scheduling in ground ad hoc networks

 

Authors: Sharma, V; Kumar, R

INTERNATIONAL JOURNAL OF AD HOC AND UBIQUITOUS COMPUTING 

Volume: 30     Issue: 1     Pages: 1-10     Published: 2019      Language: English       Document type: Article

 

Abstract:

Hybrid networks provide a vast range of applications in areas of military and civilian activities. One of the examples of hybrid network formations is unmanned aerial vehicles (UAVs) assisted ground ad hoc networks. Efficient coordination in these networks can resolve complex issues such as coverage, proper connectivity, scalability, and QoS. However, reliable data transmission with enhanced QoS is one of the key challenges in these types of hybrid ad hoc formations. In this paper, an efficient queue scheduling approach is proposed that allows improved QoS to end users. The proposed queue scheduling approach is developed in two parts. The first part utilises the Quaternion based Kalman Filter to find the appropriate locations for placement of each UAV. In the second part, satisfied importance analysis (SIA) is used to find the governing rules for the selection of appropriate queue for transmission. The effectiveness of the proposed model is demonstrated using simulations.

 

 


 

Record 4 of 11

Multimedia big data computing and Internet of Things applications: A taxonomy and process model

 

Authors: Kumari, A; Tanwar, S; Tyagi, S; Kumar, N; Maasberg, M; Choo, KKR

JOURNAL OF NETWORK AND COMPUTER APPLICATIONS 

Volume: 124     Pages: 169-195     Published: DEC 15 2018      Language: English       Document type: Review

DOI: 10.1016/j.jnca.2018.09.014

 

Abstract:

With an exponential increase in the provisioning of multimedia devices over the Internet of Things (IoT), a significant amount of multimedia data (also referred to as multimedia big data - MMBD) is being generated. Current research and development activities focus on scalar sensor data based IoT or general MMBD and overlook the complexity of facilitating MMBD over loT. This paper examines the unique nature and complexity of MMBD computing for loT applications and develops a comprehensive taxonomy for MMBD abstracted into a novel process model reflecting MMBD over IoT. This process model addresses a number of research challenges associated with MMBD, such as scalability, accessibility, reliability, heterogeneity, and Quality of Service (QoS) requirements. A case study is presented to demonstrate the process model.

 

 


 

Record 5 of 11

A computational study of Stillinger-Weber silicon at 0.75 GPa in supercooled region

 

Authors: Gautam, AK; Chandra, A

INTERNATIONAL JOURNAL OF MODERN PHYSICS B 

Volume: 32     Issue: 30     Published: DEC 10 2018      Language: English       Document type: Article

DOI: 10.1142/S0217979218503307

 

Abstract:

We studied the liquid-liquid transition in supercooled silicon modeled by the Stillinger-Weber potential. The Isothermal Isobaric Monte Carlo (NPT-MC) simulation techniques were performed here to compute the free energy difference between the two liquid phases of silicon by Bennett Acceptance Ratio (BAR) method along with a reversible path at 0.75 GPa pressure and 970 K temperature. The thermodynamic properties as energy (phi) and density (rho) of the high-density liquid (HDL) phase have been computed here at different temperatures from 970-990 K. We also computed the entropy difference between the high-density liquid (HDL) and low-density liquid (LDL) phases which indicates that the glass transition temperature for the LDL phase is lower compared to the HDL phase. Further, by using the BAR method, we have computed the excess Gibbs free energy (G(e)) of HDL phase with respect to the crystalline phase at different temperatures in the supercooled region of SW-Silicon potential model. Based on the slope of excess Gibbs free energy with respect to temperature (T), we found that the excess entropy (S-e) of the HDL with respect to crystalline phase shows a nonmonotonic dependence on temperature at the liquid-liquid transition temperature of T-LL( )= 970 K. Our results are in good agreement with the previous observation of a nonmonotonic dependence of the enthalpy on temperature in MD simulations, starting with the HDL phase at a temperature just above T-LL. All these properties are useful to understand the phase behavior of supercooled silicon and can be applicable to identify the better quality of silicon for industrial uses.

 

 


 

Record 6 of 11

A numerical treatment of unsteady three-dimensional hydromagnetic flow of a Casson fluid with Hall and radiation effects

 

Authors: Prashu; Nandkeolyar, R

RESULTS IN PHYSICS 

Volume: 11     Pages: 966-974     Published: DEC 2018      Language: English       Document type: Article

DOI: 10.1016/j.rinp.2018.10.041

 

Abstract:

The study of the unsteady magnetohydrodynamic three-dimensional radiative flow of a viscous incompressible electrically conducting Casson liquid along a stretching surface including the effects of Hall current is presented in this article. The fluid flow model consists of time-dependent partial differential equations which are highly non-linear. Similarity transformations are utilized to obtain ordinary differential equations in similarity form. Further, a numerical approach, namely spectral quasilinearization method (SQLM), is used to solve resulting highly nonlinear ordinary differential equations. A detailed analysis is carried out to study the influences of significant parameters, such as Casson liquid parameter, Hall current parameter, magnetic parameter, unsteadiness parameter, radiative parameter, on the profiles' of the velocity field and temperature field. The behavior of emerging quantities of engineering interest such as skin friction coefficient and the Nusselt number is also studied. Fluid flow model as presented in the paper finds applications in silicon suspensions, blood flow, polymer engineering, and printing industry.

 

 


 

Record 7 of 11

Photocatalytic study of ZnS-Ag2S nanocomposites-effect of thioglycerol

 

Authors: Kaur, J; Gupta, A; Pandey, OP

SOLAR ENERGY 

Volume: 176     Pages: 678-687     Published: DEC 2018      Language: English       Document type: Article

DOI: 10.1016/j.solener.2018.10.077

 

Abstract:

Nanocomposites (NCs) of different band gap semiconductors provide better photocatalytic activity as compared to that of monolithic semiconductor nanoparticles (NPs). With the aim to investigate the effect of organic capping agent (thioglycerol; TG in the present study) on photocatalytic activity, ZnS-Ag2S NCs have been synthesized in the presence of TG using simple chemical precipitation route. For comparative studies, NCs have been synthesized under same synthesis conditions without TG. Structural studies were done using X-Ray diffraction (XRD) technique. Morphological features of as prepared samples were recorded by high resolution transmission electron microscopy (HRTEM). UV-Vis and photoluminescence studies were carried out to study the optical properties of synthesized samples. Photocatalytic studies of as-synthesized NCs have been carried out by selecting crystal violet (CV) as a model organic pollutant. It is observed that NCs (synthesized in absence of TG) exhibit better photocatalytic activity as compared to the TG capped NCs. The results of the present study may helpful in practical application of these composites in the area of photocatalysis and other related optical applications.

 

 


 

Record 8 of 11

Performance prediction of PV module using electrical equivalent model and artificial neural network

 

Authors: Mittal, M; Bora, B; Saxena, S; Gaur, AM

SOLAR ENERGY 

Volume: 176     Pages: 104-117     Published: DEC 2018      Language: English       Document type: Article

DOI: 10.1016/j.solener.2018.10.018

 

Abstract:

Before a photovoltaic (PV) system is installed, a prerequisite modelling and performance analysis are carried out which estimates the performance parameters and reliability in operation of PV system. This paper proposes a neural network approach to performance prediction of PV Modules. Here the feed forward neural networks are used to predict I-V curve parameters as a function on input irradiance and temperature. K Fold cross-validation is used to validate model accuracy for determination of I-V curve parameters for five different technology modules, i.e., CdTe, CIGS, MICROMORPH, MUTICRYSTALLINE, MAXEON. A comparison is also drawn between the neural network predictor and the existing modeling procedures available. Model parameters have been determined following iterative, analytical and regression of known data points for seven and five parameter model of PV Modules. Among the electrical equivalent models, the seven parameter model is the most efficient model for performance prediction however commutation of model parameters in complex and tedious. Neural network model simplifies the computational process at the expense of higher error variance in comparison to electrical equivalent models. Further, a cascade implementation of the above two is designed and tested on Multicrystalline and Maxeon technology modules for higher model accuracy. The results obtained, verify the proposed cascaded model to be the most efficient model in comparison to independent models where mean bias error deviations are less than +/- 1% and error variance is reduced significantly. Also, a MATLAB based graphical user interface (GUI) is developed that can be used to predict the performance based on the analysis carried out. The proposed model is tested against a set of operating conditions and compared to the actual experimental values obtained using outdoor tests.

 

 


 

Record 9 of 11

Crosslinked polymer doped binary coatings for corrosion protection

 

Authors: Kaur, H; Sharma, J; Jindal, D; Arya, RK; Ahuja, SK; Arya, SB

PROGRESS IN ORGANIC COATINGS 

Volume: 125     Pages: 32-39     Published: DEC 2018      Language: English       Document type: Article

DOI: 10.1016/j.porgcoat.2018.08.026

 

Abstract:

Solvent-based polymeric multilayer coatings prepared by ex-situ addition of crosslinked poly(styrene-co-divinyl benzene) in poly(styrene)-ethylbenzene solution were examined for corrosion protection of mild steel in a simulated water environment equivalent to sea water and acid rain. Electrochemical impedance spectroscopy (EIS) technique was used to determine the corrosion resistance behavior of the prepared polymeric coatings in 3.5 wt% of NaCl aqueous solution. EIS analysis suggested that the sample solution prepared by adding 1% crosslinked polymer in poly(styrene)-ethylbenzene solution, has better corrosion resistance as compared to the sample solutions prepared by adding 3% and 2% of crosslinked polymer in poly(styrene)-ethylbenzene solutions. Scanning electron microscopy (SEM) revealed that substrate coated with polymeric solution prepared by adding 1% of crosslinked polymer in poly(styrene)-ethyl benzene solution showed less corrosion as compared to the substrates coated with sample solutions prepared by adding 3% and 2% of crosslinked polymer in poly(styrene)-ethylbenzene solutions.

 

 


 

Record 10 of 11

Surfactant enhanced drying of waterbased poly(vinyl alcohol) coatings

 

Authors: Sharma, D; Sharma, J; Arya, RK; Ahuja, S; Agnihotri, S

PROGRESS IN ORGANIC COATINGS 

Volume: 125     Pages: 443-452     Published: DEC 2018      Language: English       Document type: Article

DOI: 10.1016/j.porgcoat.2018.06.013

 

Abstract:

Coatings of the poly(vinyl alcohol)-water based system have been studied. The effect of various surfactants on drying beavior was investigated. Anionic (SDS), non- ionic (PEG) and fluoro based surfactants (CAPSTONE FS-63) were used to minimize the residual solvent. The results indicate that the anionic surfactant is not much effective in drying of these coatings whereas the non-ionic surfactant changed the drying behavior to a small extent. The fluro based surfactant showed the significant effect on drying behavior of the coatings. The drying rate in the fluoro based surfactant was moderate for a longer time which led to more solvent recovery. Solutions with high polymer concentrations need high amount of surfactant for significant change in the drying behavior.

 

 


 

Record 11 of 11

Design and analysis of a compact WiMAX and WLAN band notched planar monopole antenna for UWB and bluetooth applications

 

Authors: Singh, HS; Kalraiya, S

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING 

Volume: 28     Issue: 9     Published: NOV 2018      Language: English       Document type: Article

DOI: 10.1002/mmce.21432

 

Abstract:

In this manuscript, a compact UWB with dual band-notched planar monopole antenna is investigated. The band notched characteristics at WiMAX and WLAN is obtained by connecting two pairs of stubs to the modified ground plane. The size of proposed antenna is 25(W) x 30(L) x 1.6(H) mm(3) which consists of a fork shaped structure as a main radiating element and excited with a 50-omega microstrip line. The proposed antenna covers Bluetooth frequency band (2.4-2.48 GHz) along with UWB spectrum without increasing the size of the antenna. The measured operating frequency of the proposed antenna is from 2.4 to 12.8 GHz along with WiMAX and WLAN band-notched. Moreover, the measured gain of the proposed antenna varies between 2 and 6 dBi except notched band. At notched frequencies, it is -1 and -6 dBi at WiMAX and WLAN, respectively. The total antenna efficiency varies from 80% to 95% except notched frequency bands. The radiation patterns and time domain characteristics are also analyzed and found suitable for the modern UWB applications. Finally, a prototype of dual band-notched antenna is manufactured and its characteristics are measured using network analyzer. The simulated and measured results are found in close agreement.