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Concentration Dependent Optical Properties of Rhodamine B Doped Poly(vinyl alcohol) Solutions
Jitendra Tripathi,Anupam Sharma,Shilpa Tripathi,Kallol Kumar Das 한국고분자학회 2016 Macromolecular Research Vol.24 No.7
The optical properties, namely refractive index (RI) studies, are reported on a series of pure and doped poly(vinyl alcohol) (PVA) in solution form. The PVA solutions were synthesized with 1, 2, 3, 4, and 5 wt% of PVA in distilled water followed by doping with Rhodamine B in concentrations ranging from 0.05 wt% to 2 wt%. The absorption spectra show an observable shift in the band edge position towards higher wavelength with increase in PVA wt%. When the dopant molecules are added, the curves are drastically modified with the occurrence of new peaks arising at higher doping concentrations along with change in the bandgap. These effects are prominent for all the concentration of PVA solution. The RI does not change much for low doping wt%. but when dopant is added in higher concentrations, it increases slightly reaching a maximum of ~1.35 at 2 wt%. It is observed that host polymer properties dominate at low doping while a combination of host polymer and dopant dye properties dominate at higher doping concentrations.
Tales from Fragments: A Review of Indian Human Skeletal Studies
Veena Mushrif-Tripathy 대한체질인류학회 2019 해부·생물인류학 (Anat Biol Anthropol) Vol.32 No.2
India provides large number of skeletal data from the pre- and protohistoric levels covering a time span of almost 10,000 years. Major skeletal collection comes from the cultural phases ranging from the Mesolithic, Harappan, Neolithic, Chalcolithic and Iron Age levels. After the Early Historic phase cremation became the most common method for disposing the dead. Though the relevant documentation is far less than complete, recovery of human burials has been reported from more than 300 sites (Mushrif-Tripathy et al. 2016) and a conservative estimate would lead to imagine approximately 2000 human skeletons. The human skeletal analysis started around 1950s and initial focus of the study was to understand the racial classification of the skulls and to prove the Indo-Aryan invasion theory. Later from 1980s multidisplinary approach including socio-cultural anthropology, growth and nutrition and medical anthropology were considered. The recent development includes the use of new scientific methods like isotope, aDNA, DXA scans, and Scanning Electron Microscope studies etc. are consider to understand ancient inhabitants of Indian Sub-continent.
ON LOCATION OF THE ZEROS OF POLYNOMIAL (LACUNARY TYPE)
Tripathi D.,Hyun H.G.,Hans S. 경남대학교 수학교육과 2019 Nonlinear Functional Analysis and Applications Vol.24 No.3
The aim of this paper is to obtained some extensions and generalizations of well known result on theory of distribution of zeros and related results by relaxing the hypothesis of Enestr\"{o}m-Kakeya theorem for a class of Lacunary type of polynomials $p(z):=a_0+\sum_{\nu=\mu}^{n}a_\nu z^\nu, 1\le \mu\le n$.
Tropical Soil Bacterial Communities in Malaysia: pH Dominates in the Equatorial Tropics Too
Tripathi, Binu M.,Kim, Mincheol,Singh, Dharmesh,Lee-Cruz, Larisa,Lai-Hoe, Ang,Ainuddin, A. N.,Go, Rusea,Rahim, Raha Abdul,Husni, M. H. A.,Chun, Jongsik,Adams, Jonathan M. Springer-Verlag 2012 Microbial ecology Vol.64 No.2
Tailored lysozyme–ZnO nanoparticle conjugates as nanoantibiotics
Tripathy, Nirmalya,Ahmad, Rafiq,Bang, Seung Hyuck,Min, Jiho,Hahn, Yoon-Bong The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.66
<P>Covalently attached lysozyme–ZnO nanoparticle (L–ZNP) conjugates were synthesized by a low temperature solution route. Tailored L–ZNP conjugates exhibit pronounced antibacterial features against <I>Escherichia coli</I> (<I>E. coli</I>) and <I>Staphylococcus aureus</I> (<I>S. aureus</I>).</P> <P>Graphic Abstract</P><P>Covalently attached lysozyme–ZnO nanoparticle conjugates exhibit pronounced antibacterial features against <I>Escherichia coli</I> and <I>Staphylococcus aureus</I>. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc03712j'> </P>
Tripathi, Om P.,Baldwin, Mark,Charlton‐,Perez, Andrew,Charron, Martin,Eckermann, Stephen D.,Gerber, Edwin,Harrison, R. Giles,Jackson, David R.,Kim, Baek‐,Min,Kuroda, Yuhji,Lang, Andrea,Mah John WileySons, Ltd 2015 Quarterly journal of the Royal Meteorological Soci Vol.141 No.689
<P>Extreme variability of the winter‐ and spring‐time stratospheric polar vortex has been shown to affect extratropical tropospheric weather. Therefore, reducing stratospheric forecast error may be one way to improve the skill of tropospheric weather forecasts. In this review, the basis for this idea is examined. A range of studies of different stratospheric extreme vortex events shows that they can be skilfully forecasted beyond 5 days and into the sub‐seasonal range (0–30 days) in some cases. Separate studies show that typical errors in forecasting a stratospheric extreme vortex event can alter tropospheric forecast skill by 5–7% in the extratropics on sub‐seasonal time‐scales. Thus understanding what limits stratospheric predictability is of significant interest to operational forecasting centres. Both limitations in forecasting tropospheric planetary waves and stratospheric model biases have been shown to be important in this context.</P>
Time-Dependent Controlof Hole-Opening Degree of Porous ZnO Hollow Microspheres
Tripathy, Nirmalya,Ahmad, Rafiq,Jeong, Han-Sol,Hahn, Yoon-Bong American ChemicalSociety 2012 Inorganic Chemistry Vol.51 No.2
<P>Well-designed, monodispersed porous ZnO hollow microsphereswithcontrolled hole-opening were successfully synthesized by a faciletwo-step solution route at low temperature. The hollow microsphereshaving average diameter of 3–4 μm showed time-dependenthole-opening, i.e. 4–100% for 15–75 min. The hole-openingpercentage increases linearly with time until complete opening. TheZnO hollow microspheres also exhibited a high surface area (34 m<SUP>2</SUP> g<SUP>–1</SUP>), a large pore volume (0.19 cm<SUP>3</SUP> g<SUP>–1</SUP>) and an average pore diameter of 3.8nm. A plausible growth mechanism for the formation of ZnO hollow microsphereswas also proposed.</P><P>Well-designed, monodispersed porous ZnOhollow microsphereswith controlled hole-opening were synthesized by a facile low temperature,two-step solution route. The hollow microspheres having average diameterof 3−4 μm showed time-dependent hole-opening. The hole-openingpercentage increases linearly with time until complete opening. TheZnO hollow microspheres also exhibited high surface area, large porevolume and average pore diameter of 3.8 nm. A plausible growth mechanismfor the formation of ZnO hollow microspheres was also proposed.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2012/inocaj.2012.51.issue-2/ic2022598/production/images/medium/ic-2011-022598_0005.gif'></P>
Tripathi, Niraj,Saini, Navinder,Tiwari, Sharad 한국작물학회 2013 Journal of crop science and biotechnology Vol.16 No.4
In recent years, Coleus forskohlii has been considered plant as an important medicinal. Because of the continuous collection of roots from the wild sources, this plant has been included in the list of endangered species. This has necessitated the use of biotechnology in conservation and sustainable management of this endangered plant species. Morphological and molecular characterization of this herb will enhance our understanding in improving the optimal yields of Forskolin through breeding. To assess the morphological and molecular genetic diversity in 18 C. forskohlii genotypes collected from different places of central India, RAPD, ISSR, and AFLP marker systems were employed. Eleven RAPD, ten ISSRs and eight AFLP primers produced 101, 80, and 483 fragments, respectively. Among the three marker system used in this study, RAPD and ISSR showed 61.39 and 68.75% polymorphism, respectively, while eight AFLP primer combinations produced 70.81% polymorphism. UPGMA cluster analysis method group genotypes in two clusters with all marker systems separately and after combined analysis. Results show that both morphological and molecular factors are effective in observing variations. Our results also indicate that the RAPD, ISSR, and AFLP approaches, along with pharmaceutically important morphological trait analysis, seemed to be best-suited for assessing the genetic relationships among distinct C. Forskohlii genotypes with high accuracy.