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Prakash, Jai,Kumar, Vinod,Kroon, R. E.,Asokan, K.,Rigato, V.,Chae, K. H.,Gautam, S.,Swart, H. C. The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.4
<P>Au nanoparticles (NPs) on the surface and embedded in a matrix have been the subject of studies dealing with a variety of spectroscopic and sensing applications. Here, we report on low energy Ar ion induced evolution of the morphology of a thin Au film on a polyethylene terephthalate (PET) substrate along with thermodynamic interpretations, and corresponding unique surface plasmon resonance (SPR) and photoluminescence (PL) properties. These properties are linked to the variation of surface nanostructures and the surface enhanced Raman scattering (SERS) effect of methyl orange (MO) dye molecules adsorbed on the surface. Ion induced thermal spike and sputtering resulted in dewetting of the film with subsequent formation of spherical NPs. This was followed by embedding of the NPs in the modified PET due to the thermodynamic driving forces involved. The surface and interface morphologies were studied using atomic force microscopy and cross-sectional transmission electron microscopy. X-ray photoelectron spectroscopy was used to study the chemical changes in the system upon irradiation. The optical properties were studied by diffuse reflectance UV-Vis spectroscopy and PL using a 325 nm He-Cd laser. The red shift of the SPR absorption and the blue shift of the PL emission have been correlated with the surface morphology. The blue PL emission bands at around 3.0 eV are in good agreement with the literature with respect to the morphological changes and the blue shift is attributed to compressive strain on the embedded Au NPs. Enhancement of the SERS signals is observed and found to be correlated with the SPR response of the Au nanostructures. The SERS analyses indicate that MO molecules may be adsorbed with different orientations on these surfaces i.e. Au NPs located on the surface or embedded in the modified PET. These polymeric substrates modified by NPs can have a potential application in solid-state light emitting devices and can be applied in SERS based sensors for the detection of organic compounds.</P>
On Generalized ø-Recurrent LP-Sasakian Manifolds
Jaiswal, Jai Prakash,Ojha, Ram Hit Department of Mathematics 2009 Kyungpook mathematical journal Vol.49 No.4
In this paper we studied generalized ${\phi}$-recurrent and generalized concircular ${\phi}$-recurrent LP-Sasakian manifolds.
Cervicothoracic Thymic Cyst: An Unusual Presentation
Anjith Prakash Rajakumar,Jai Ganesh,Swaminathan Vaidyanathan,Ravi Agarwal 대한흉부외과학회 2018 Journal of Chest Surgery (J Chest Surg) Vol.51 No.2
Cervicothoracic thymic cysts are rare and difficult to diagnose preoperatively. We report a case of a cervicothoracic thymic cyst presenting as a lateral neck mass and mimicking a laryngocele in a 3-year-old boy and its definitive management.
Kumar, Vinod,Prakash, Jai,Singh, Jitendra Pal,Chae, Keun Hwa,Swart, C.,Ntwaeaborwa, O.M.,Swart, H.C.,Dutta, Viresh Elsevier 2017 Colloids and surfaces Biointerfaces Vol.159 No.-
<P><B>Abstract</B></P> <P>The Ag doped ZnO (ZnO:Ag) NPs with a hexagonal wurtzite structure were synthesized by a solution combustion method. X-ray absorption near edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) were used to study the defects, local electronic and atomic structures before and after Ag doping. XPS and XANES studies confirmed the deficiency of concentration of defects in ZnO after Ag doping. The photoluminescence study showed the deep level emission in the orange-red region in addition to the band to band emission. It was also found that the defect related emission of ZnO was decreased with an increasing in Ag concentration. The antibacterial behaviour of ZnO and ZnO:Ag NPs was studied against the gram positive and gram negative bacteria. The role of Ag doping and defects in the ZnO NPs were discussed for the observed antibacterial and photoluminescence behaviour.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ag doped ZnO. </LI> <LI> Antibacterial study. </LI> <LI> XANES and XPS analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
FRACTIONAL CALCULUS AND INTEGRAL TRANSFORMS OF INCOMPLETE τ-HYPERGEOMETRIC FUNCTION
Pandey, Neelam,Patel, Jai Prakash Korean Mathematical Society 2018 대한수학회논문집 Vol.33 No.1
In the present article, authors obtained certain fractional derivative and integral formulas involving incomplete ${\tau}$-hypergeometric function introduced by Parmar and Saxena [14]. Some interesting special cases and consequences of our main results are also considered.
Woo, Sumin,Singh, Gyan Prakash,Oh, Jai‐,Ho,Lee, Kyoung‐,Min John Wiley Sons, Ltd 2018 International journal of climatology Vol.38 No.12
<P>We provide a broad view of East Asian summer monsoon (EASM) precipitation and their changes in the 21st century under the representative concentration pathway RCP4.5 and RCP8.5 scenarios using a high‐resolution (at 40 km) atmospheric general circulation model (AGCM). The simulated fields are validated against the multiple observational data sets in the reference period (1979–2008). Validation of seasonal simulated global climatology and EASM precipitation, annual cycle and various circulation fields including 25 individual Coupled Model Intercomparison Project phase 5 (CMIP5) and CMIP5 MME suggests that AGCM can be used to study the future projected characteristics of EASM. An investigation of uncertainty in precipitation shows larger values in the regions of high‐precipitation belt and low terrain.</P><P>Future projections are categorized as near (2010–2039), mid (2040–2069) and far (2070–2100) futures. The model projects an increased summer precipitation of about 3.2% (2.3%) in near future, about 4.5% (4.5%) in mid‐future and about 2.4% (2.3%) in far future over East Asia region under RCP4.5 (RCP8.5) scenarios when compared to the reference period. As far as regional landmasses are concerned, model projects a gradual increase in the range of 5–15% over northeast China, coastal regions of southern China, Korea and Japan regions and a decrease of about 5–10% over southeastern and northwest parts of East Asia during the 21st century. The projected increase of EASM can be attributed to an increase in atmospheric moistures (relative humidity) over the east coast of China, Korea and northeast China and north and northwestwards enhancement of eddy geopotential height. Extreme events are examined by using various precipitation indices over EASM regions. Results indicate that the indices of heavy precipitation are projected to increase (both frequency and intensity) over Korea, Japan and northeast China in the range of 5–20%, indicating strong sensitivity of EASM to global warming.</P>
A comparison of the forces on dome and prism for straight and tornadic wind using CFD model
Yousef, Majdi A.A.,Selvam, Panneer R.,Prakash, Jai Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.6
Tornadoes are vertical swirling air formed because of the existence of layers of air with contrasting features of temperature, wind flow, moisture, and density. Tornadoes induce completely different wind forces than a straight-line (SL) wind. A suitably designed building for an SL wind may fail when exposed to a tornado-wind of the same wind speed. It is necessary to design buildings that are more resistant to tornadoes. In tornado-damaged areas, dome buildings seem to have less damage. As a dome structure is naturally wind resistant, domes have been used in back yards, as single family homes, as in-law quarters, man caves, game rooms, storm shelters, etc. However, little attention has been paid to the tornadic wind interactions with dome buildings. In this work, the tornado forces on a dome are computed using Computational Fluid Dynamics (CFD) for tornadic and SL wind. Then, the interaction of a tornado with a dome and a prism building are compared and analyzed. This work describes the results of the tornado wind effect on dome and prism buildings. The conclusions drawn from this study are illustrated in visualizations. The tornado force coefficients on a dome building are larger than SL wind forces, about 120% more in x- and y-directions and 280% more in z-direction. The tornado maximum pressure coefficients are also higher than SL wind by 150%. The tornado force coefficients on the prism are larger than the forces on the dome, about 100% more in x- and y-directions, and about 180% more in z-direction. The tornado maximum pressure coefficients on prism also are greater those on dome by 150% more. Hence, a dome building has less tornadic load than a prism because of its aerodynamic shape.
Some Desmids from Garhwal Region of Uttarakhand, India
Pradeep Kumar Misra,Madhulika Shukla and Jai Prakash,Purnima Misra 한국조류학회I 2008 ALGAE Vol.23 No.3
The present paper consists of 42 taxa belonging to 7 genera of desmids (green algae) collected from two districts of Garhwal region of Uttarakhand (Western Himalayas). The district Haridwar is located 29° 55’ to 29° 59’ N latitude and 68° 5’ to 68° 30’ E longitude covering about 2360 km2 area and Dehradun district is situated between 77°34’ to 78° 18’ E longitude and 29° 58’ to 30° 58’ N latitude. Seven genera of desmids are (with number of taxa in parenthesis): Closterium Nitzsch. (9), Cosmarium Corda ex Ralfs (25), Euastrum Ehr. (2), Spondylosium Breb. (1), Micrasterias Ag. (1), Staurastrum Meyen (3), Arthrodesmus Ehr. (1). All these taxa constitute new records for the area. The algal localities are relatively cleaner than those of majority of urban areas. A rich assemblage of desmids shows that water bodies of these hilly areas are still undisturbed and need protection for preservation of algal biodiversity.