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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.
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.
Fresh-CSMA: A Distributed Protocol for Minimizing Age of Information
Tripathi, Vishrant,Jones, Nicholas,Modiano, Eytan 한국통신학회 2023 Journal of communications and networks Vol.25 No.5
We consider the design of distributed scheduling algorithms that minimize Age of Information (AoI) in single-hop wireless networks. The centralized max-weight policy is known to be nearly optimal in this setting; hence, our goal is to design a distributed Carrier Sense Multiple Access (CSMA) scheme that can mimic its performance. To that end, we propose a distributed protocol called Fresh-CSMA and show that in an idealized setting, Fresh-CSMA can match the scheduling decisions of the max-weight policy with high probability in each frame, and also match the theoretical performance guarantees of the max-weight policy over the entire time horizon. We then consider a more realistic setting and study the impact of protocol parameters on the probability of collisions and the overhead caused by the distributed nature of the protocol. We also consider the monitoring of Markov sources and extend our approach to CSMA protocols that incorporate Age of Incorrect Information (AoII) instead of AoI. Finally, we provide simulations that support our theoretical results and show that the performance gap between the ideal and realistic versions of Fresh-CSMA is small.
Unpaid care work among women in South Asia: A systematic review
Tripathi Saumya,Azhar Sameena,Zhai Fuhua 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.3
The specific aims of this systematic review are to (1) understand the prevalence and context for women's unpaid care work in South Asia, (2) explore factors that affect the prevalence of unpaid care work, and (3) identify gaps in the extant research on unpaid care work that influence women's lives. Using the Cochrane Handbook and PRISMA guidelines for systematic reviews, we searched 18 databases and identified 13 research studies. Drawing on the devaluation framework, we found three main recurring themes in the selected studies. First, women in South Asia disproportionately share the burden of unpaid care work responsibilities. Second, due to sociocultural norms, unpaid care work is unrecognized and devalued as are those who perform it. Third, flexible working arrangements for women are not currently being offered. We conclude that there is a need for care work policies that incorporate the unique cultures, demographics, and labor markets in South Asian contexts.
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
Investigation of root phenotype in soybeans (Glycine max L.) using imagery data
Tripathi Pooja,Kim Yoonha 한국작물학회 2022 Journal of crop science and biotechnology Vol.25 No.2
Roots are the most essential plant part owing to the uptake of water and nutrients. Therefore, phenotyping of root features is vital for improving soybean cultivars. This study evaluated the root morphological and architectural traits of six soybean cultivars using two-dimensional (2D) root imaging. The cultivars were selected from a previous experiment, based on 6 root phenotypes (total root length [TRL], surface area [SA], average diameter [AD], number of tips, number of forks, and main total length [MTL]) in 372 soybean cultivars, (3 each from the highest 5% and lowest 5%). When plants reached two trifoliate leaves stage, both root and shoot parts were harvested and analyzed. According to the analysis of variance, signifcant variability was observed between the two groups (highest 5% and lowest 5%) for root and shoot morphological traits, but no signifcant diference was found regarding most root architectural traits. Among three root phenotypes (TRL, SA, and RV [root volume]), IT 21595 and IT 165432 were the highest and lowest, respectively. TRL exhibited a signifcant positive correlation with other root and shoot morphological traits, such as SA, RV, leaf area, leaf length, and leaf width. Contrastingly, AD showed a signifcant negative correlation with those parameters. TRL and SA of all the cultivars were classifed based on root diameter classes (0–0.5 mm, 0.5–1.0 mm, and 1.0–1.5 mm). A segment of TRL<0.5-mm root diameter was observed from 74.0 to 75.6% in the highest 5% cultivars and 63.7–75.3% in the lowest 5% cultivars. A segment of SA<0.5- mm root diameter was observed from 42.0 to 46.9% in the highest 5% cultivars and a relatively reduced ratio (34.5–44.7%) in the lowest 5% cultivars. Conclusively, this research highlighted the characterization of root morphological and architectural traits and some soybean cultivars
The Millimeter Continuum Size-Frequency Relationship in the UZ Tau E Disk
Tripathi, Anjali,Andrews, Sean M.,Birnstiel, Tilman,Chandler, Claire J.,Isella, Andrea,Pé,rez, Laura M.,Harris, R. J.,Ricci, Luca,Wilner, David J.,Carpenter, John M.,Calvet, N.,Corder, S. A.,Del American Astronomical Society 2018 The Astrophysical journal Vol.861 No.1
<P>We present high spatial resolution observations of the continuum emission from the young multiple star system UZ Tau at frequencies from 6 to 340 GHz. To quantify the spatial variation of dust emission in the UZ Tau E circumbinary disk, the observed interferometric visibilities are modeled with a simple parametric prescription for the radial surface brightnesses at each frequency. We find evidence that the spectrum steepens with radius in the disk, manifested as a positive correlation between the observing frequency and the radius that encircles a fixed fraction of the emission (R-eff proportional to nu(0.34 +/- 0.08)). The origins of this size-frequency relation are explored in the context of a theoretical framework for the growth and migration of disk solids. While that framework can reproduce a similar size-frequency relation, it predicts a steeper spectrum than that observed. Moreover, it comes closest to matching the data only on timescales much shorter (<= 1 Myr) than the putative UZ Tau age (similar to 2-3 Myr). These discrepancies are direct consequences of the rapid radial drift rates predicted by models of dust evolution in a smooth gas disk. One way to mitigate that efficiency problem is to invoke small-scale gas pressure modulations that locally concentrate drifting solids. If such particle traps reach high-continuum optical depths at 30-340 GHz with a similar to 30%-60%. filling fraction in the inner disk (r less than or similar to 20 au), they can also explain the observed spatial gradient in the UZ Tau E disk spectrum.</P>