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Gorantla Shanmukha Srinivas,Pradeep Kumar G N 대한공간정보학회 2021 Spatial Information Research Vol.29 No.3
Due to industrialization and overblown population, the quality of groundwater has become an issue of major concern at global level. Groundwater Quality Index (GWQI), a technique of rating water quality, is an effective tool to assess spatial and temporal changes. Water samples collected from fourteen well locations and analyzed for physico-chemical parameters viz., pH, Alkalinity, Calcium (Ca2?), Magnesium (Mg2?), Total Hardness (TH), Chlorides (Cl-), Nitrates (No3 -), Sulphates (So4 2-), Total Dissolved Solids (TDS). In this study, methodology based on Multi Criterion Decision Making analysis is developed to create a GWQI, with the aim of identifying places with best quality for drinking within the Cheyyeru Watershed, YSR District. Weights proposed through Analytical Hierarchical Process are applied using National Sanitation Foundation method for determining GWQI. Indices revealed that GWQI varied from 117.02 to 408.74. The impact of land use changes has favored the deterioration of groundwater quality in the basin. Overall assessment of the basin reveals that almost all the parameters analyzed are above the desirable limits. The higher concentration of Mg2? during post-monsoon samples exhibits poor quality of water as compared to summer season. Sample test results were cross-correlated and significant influence on GWQI is observed from Mg2?, TH, and TDS. An interpolation technique Inverse Distance Weighted was used to obtain the spatial distribution of GWQI. The analysis revealed that the groundwater in the basin needs some degree of treatment before consumption, and it also needs to be protected from the perils of contamination.
Gorantla, Vasavi R.,Bond, Vernon Jr.,Dorsey, James,Tedesco, Sarah,Kaur, Tanisha,Simpson, Matthew,Pemminati, Sudhakar,Millis, Richard M. KOREAN PHARMACOPUNCTURE INSTITUTE 2019 Journal of pharmacopuncture Vol.22 No.3
Objectives: Attentional and memory functions are important aspects of neural plasticity that, theoretically, should be amenable to pharmacopuncture treatments. A previous study from our laboratory suggested that quantitative electroencephalographic (qEEG) measurements of theta/beta ratio (TBR), an index of attentional control, may be indicative of academic performance in a first-semester medical school course. The present study expands our prior report by extracting and analyzing data on frontal theta and beta asymmetries. We test the hypothesis that the amount of frontal theta and beta asymmetries (fTA, fBA), are correlated with TBR and academic performance, thereby providing novel targets for pharmacopuncture treatments to improve cognitive performance. Methods: Ten healthy male volunteers were subjected to 5-10 min of qEEG measurements under eyes-closed conditions. The qEEG measurements were performed 3 days before each of first two block examinations in anatomy-physiology, separated by five weeks. Amplitudes of the theta and beta waveforms, expressed in ${\mu}V$, were used to compute TBR, fTA and fBA. Significance of changes in theta and beta EEG wave amplitude was assessed by ANOVA with post-hoc t-testing. Correlations between TBR, fTA, fBA and the raw examination scores were evaluated by Pearson's product-moment coefficients and linear regression analysis. Results: fTA and fBA were found to be negatively correlated with TBR (P<0.03, P<0.05, respectively) and were positively correlated with the second examination score (P<0.03, P=0.1, respectively). Conclusion: Smaller fTA and fBA were associated with lower academic performance in the second of two first-semester medical school anatomy-physiology block examination. Future studies should determine whether these qEEG metrics are useful for monitoring changes associated with the brain's cognitive adaptations to academic challenges, for predicting academic performance and for targeting phamacopuncture treatments to improve cognitive performance.
Vasavi R Gorantla,Vernon Bond Jr,James Dorsey,Sarah Tedesco,Tanisha Kaur,Matthew Simpson,Sudhakar Pemminati,Richard M. Millis 대한약침학회 2019 Journal of pharmacopuncture Vol.22 No.3
Objectives: Attentional and memory functions are important aspects of neural plasticity that, theoretically, should be amenable to pharmacopuncture treatments. A previous study from our laboratory suggested that quantitative electroencephalographic (qEEG) measurements of theta/beta ratio (TBR), an index of attentional control, may be indicative of academic performance in a first-semester medical school course. The present study expands our prior report by extracting and analyzing data on frontal theta and beta asymmetries. We test the hypothesis that the amount of frontal theta and beta asymmetries (fTA, fBA), are correlated with TBR and academic performance, thereby providing novel targets for pharmacopuncture treatments to improve cognitive performance. Methods: Ten healthy male volunteers were subjected to 5-10 min of qEEG measurements under eyes-closed conditions. The qEEG measurements were performed 3 days before each of first two block examinations in anatomy-physiology, separated by five weeks. Amplitudes of the theta and beta waveforms, expressed in μV, were used to compute TBR, fTA and fBA. Significance of changes in theta and beta EEG wave amplitude was assessed by ANOVA with post-hoc t-testing. Correlations between TBR, fTA, fBA and the raw examination scores were evaluated by Pearson’s product-moment coefficients and linear regression analysis. Results: fTA and fBA were found to be negatively correlated with TBR (P<0.03, P<0.05, respectively) and were positively correlated with the second examination score (P<0.03, P=0.1, respectively). Conclusion: Smaller fTA and fBA were associated with lower academic performance in the second of two first-semester medical school anatomy-physiology block examination. Future studies should determine whether these qEEG metrics are useful for monitoring changes associated with the brain’s cognitive adaptations to academic challenges, for predicting academic performance and for targeting phamacopuncture treatments to improve cognitive performance.
Criteria for tensile plasticity in Cu–Zr–Al bulk metallic glasses
Pauly, S.,Liu, G.,Gorantla, S.,Wang, G.,Kü,hn, U.,Kim, D.H.,Eckert, J. Elsevier 2010 Acta materialia Vol.58 No.14
<P><B>Abstract</B></P><P>(Cu<SUB>0.5</SUB>Zr<SUB>0.5</SUB>)<SUB>100−</SUB><I><SUB>x</SUB></I>Al<I><SUB>x</SUB></I> (<I>x</I>=5, 6, 8) bulk metallic glasses (BMGs) were deformed in tension. Besides ductility up to 0.5%, the material shows work-hardening behaviour. Both effects are attributed to the deformation-induced precipitation of B2 CuZr nanocrystals and the formation of twins in the nanocrystals larger than 20nm. The precipitation of the nanocrystals alters the stress field in the matrix and is expected to retard shear band propagation, which in turn allows stresses in the nanocrystals to rise. This stress build-up is more severe in the larger grains and might be responsible for the subsequent twinning. Both deformation-induced nanocrystallization and twinning consume energy and avoid crack formation and with it premature failure.</P>
Gonzalez-Martinez, Ignacio G.,Gorantla, Sandeep M.,Bachmatiuk, Alicja,Bezugly, Viktor,Zhao, Jiong,Gemming, Thomas,Kunstmann, Jens,Eckert, Jü,rgen,Cuniberti, Gianaurelio,Rü,mmeli, Mark H. American Chemical Society 2014 NANO LETTERS Vol.14 No.2
<P>Despite significant advances in the synthesis of nanostructures, our understanding of the growth mechanisms of nanowires and nanotubes grown from catalyst particles remains limited. In this study we demonstrate a straightforward route to grow coaxial amorphous B/BO<SUB><I>x</I></SUB> nanowires and BO<SUB><I>x</I></SUB> nanotubes using gold catalyst particles inside a transmission electron microscope at room temperature without the need of any specialized or expensive accessories. Exceedingly high growth rates (over 7 μm/min) are found for the coaxial nanowires, and this is attributed to the highly efficient diffusion of B species along the surface of a nanowire by electrostatic repulsion. On the other hand the O species are shown to be relevant to activate the gold catalysts, and this can occur through volatile O species. The technique could be further developed to study the growth of other nanostructures and holds promise for the room temperature growth of nanostructures as a whole.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-2/nl404147r/production/images/medium/nl-2013-04147r_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl404147r'>ACS Electronic Supporting Info</A></P>
Free-Standing Single-Atom-Thick Iron Membranes Suspended in Graphene Pores
Zhao, Jiong,Deng, Qingming,Bachmatiuk, Alicja,Sandeep, Gorantla,Popov, Alexey,Eckert, Jü,rgen,Rü,mmeli, Mark H. American Association for the Advancement of Scienc 2014 Science Vol.343 No.6176
<P><B>Iron in Graphene</B></P><P>Carbon or other covalently bonded materials, like boron nitride, can form two-dimensional sheets because of the strong bonding between the atoms. In contrast, metals share electrons in a three-dimensional delocalized way, and this could preclude the formation of thin stable sheets. Nevertheless, <B>Zhao <I>et al.</I></B> (p. 1228) observed pure iron membranes suspended across the pores in a graphene sheet. This phenomenon was discovered when an iron chloride solution, used to process the graphene, decomposed to form pure iron films across the pores.</P>
On the Role of Vapor Trapping for Chemical Vapor Deposition (CVD) Grown Graphene over Copper
Rü,mmeli, Mark H.,Gorantla, Sandeep,Bachmatiuk, Alicja,Phieler, Johannes,Geißler, Nicole,Ibrahim, Imad,Pang, Jinbo,Eckert, Jü,rgen American Chemical Society 2013 Chemistry of materials Vol.25 No.24
<P>The role of sample chamber configuration for the chemical vapor deposition of graphene over copper was investigated in detail. A configuration in which the gas flow is unrestricted was shown to lead to graphene with an inhomogeneous number of layers (between 1 and 3). An alternative configuration in which one end of the inner tube (in which the sample is placed) is closed so as to restrict the gas flow leads a homogeneous graphene layer number. Depending on the sample placement, either homogeneous monolayer or bilayer graphene is obtained. Under our growth conditions, the data show local conditions play a role on layer homogeneity such that under quasi-static equilibrium gas conditions not only is the layer number stabilized, but the quality of the graphene improves. In short, our data suggests vapor trapping can trap Cu species leading to higher carbon concentrations, which determines layer number and improved decomposition of the carbon feedstock (CH<SUB>4</SUB>), which leads to higher quality graphene.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2013/cmatex.2013.25.issue-24/cm401669k/production/images/medium/cm-2013-01669k_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm401669k'>ACS Electronic Supporting Info</A></P>
Dominantly epitaxial growth of graphene on Ni (111) substrate
Fogarassy, Z.,Rummeli, M.H.,Gorantla, S.,Bachmatiuk, A.,Dobrik, G.,Kamaras, K.,Biro, L.P.,Havancsak, K.,Labar, J.L. New York] ; North-Holland 2014 APPLIED SURFACE SCIENCE - Vol.314 No.-
Graphene was grown on a Ni (111) thin layer, used as a substrate. The Ni layer itself was grown on single crystal sapphire (0001). Carbon was deposited by chemical vapor deposition using a mixture of methane, argon and hydrogen at atmospheric pressure implementing a constant gas flow (4.8-5l/min) varying both the gas composition and the deposition temperature (900-980<SUP>o</SUP>C) and cooling rate (8-16<SUP>o</SUP>C/min) in the different experiments. Formation of uninterruptedly grown epitaxial single layer graphene was observed over the Ni (111) thin film substrate. Epitaxial growth was proven through STM measurements. Electron diffraction studies, also confirmed by STM, demonstrated that only one dominant orientation exists in the graphene, both results providing evidence of the epitaxial growth. On top of the, continuous, large area graphene flakes were also observed with sizes varying between 10nm and 10μm. Most of the top flakes are turbostratically related to the continuous underlying epitaxial graphene layer. The formation of the graphene layer with constant dominant orientation was observed over millimeter wide areas. Large areas (~20-40μm in diameter) of continuous, epitaxial graphene, free of additional deposits and flakes were obtained for the best set of growth parameters.