125 research outputs found
Common fixed point theorems for Ï-weakly commuting maps in fuzzy metric space
In this paper we obtain some fixed point and common fixed point theorems for mappings satisfying general contractivity condition in the setting of fuzzy metric spaces. Some recent results are also derived as special cases
Herbal-based Traditional Medicinal Knowledge of Local Inhabitants in Rudraprayag District of Uttarakhand, India
Traditional medicinal knowledge has gained much attention recently due to rejuvenation of faith in traditional system of medicines. The Indian Himalaya is a source of plant based indigenous medicinal knowledge based on local plant diversity. Surveys were conducted in Rudraprayag district of Uttarakhand, India to collect indigenous information on primary health care. 29 formulations using 159 plant species were recorded treating 119 ailments in 13 broad therapeutic classes. Results have been compared with traditional knowledge from other parts of India
Convergence of some general iterative schemes
Abstract Many problems in engineering and applied sciences can be formulated as fixed-point problems
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Strongly bias-dependent tunnel magnetoresistance in manganite spin filter tunnel junctions.
A highly unconventional bias-dependent tunnel magnetoresistance (TMR) response is observed in Sm0.75 Sr0.25 MnO3 -based nanopillar spin filter tunnel junctions (SFTJs) with two different behaviors in two different thickness regimes of the barrier layer. Thinner barrier devices exhibit conventional SFTJ behaviors; however, for larger barrier thicknesses, the TMR-bias dependence is more complex and reverses sign at higher bias.This work was partially supported by the ERC Advanced Integrators Grant âSUPERSPINâ. B.P.
was funded by the Nehru Trust for Cambridge University and St Johnâs College. The TEM work at
Texas A&M was supported by the U.S. National Science Foundation (NSF-DMR 0846504).This is the accepted manuscript. The final version is available at http://onlinelibrary.wiley.com/wol1/doi/10.1002/adma.201405147/abstract
Ecological features and traditional knowledge of Roscoea alpina Royle a medicinal plant in Himalaya
Roscoea alpina Royle (Zingiberaceae) commonly known as Kakoli is a perennial medicinal herb endemic to the Himalayas. It is used in vitality strengthening Ayurveda groups i.e., Astavarga and Jeevaniyagana and in preparation of Ayurvedic formulations e.g., Chyavanprasha and Divya Pidantak Tail. Considering its medicinal uses, high demand and overexploitation, natural habitats were surveyed in subalpine and alpine regions of Garhwal Himalayas for population estimation and to identify elite germplasm. R. alpina frequency was recorded more than 60 % in Tungnath, Dayara, Valley of Flowers and Kedarnath populations. However, plant density and area occupied were low compared to other species of subalpine and alpine region. For threat category assessment, IUCN Red List Categories and criteria were used and conservation status was assigned, based on site to site and for entire Garhwal region of the Western Himalaya. R. alpina, based on extent of occurrence was categorized as Vulnerable and based on number of mature individuals as Endangered for the Garhwal Himalaya. Further, habitat destruction and degradation were the major threats for population reduction in the wild. Morphological variation revealed plants from Tungnath and Kedarnath may be used for future propagation and domestication efforts
Phase Transformation Driven by Oxygen Vacancy Redistribution as the Mechanism of Ferroelectric Hf0.5Zr0.5O2 Fatigue
AbstractAs a promising candidate for nonvolatile memory devices, the hafniaâbased ferroelectric system has recently been a hot research topic. Although significant progress has been made over the past decade, the endurance problem is still an obstacle to its final application. In perovskiteâbased ferroelectrics, such as the wellâstudied Pb[ZrxTi1âx]O3 (PZT) family, polarization fatigue has been discussed within the framework of the interaction of charged defects (such as oxygen vacancies) with the moving domains during the switching process, particularly at the electrodeâferroelectric interface. Armed with this background, a hypothesis is set out to test that a similar mechanism can be in play with the hafniaâbased ferroelectrics. The conducting perovskite LaâSrâMnâO is used as the contact electrode to create La0.67Sr0.33MnO3 / Hf0.5Zr0.5O2 (HZO)/ La0.67Sr0.33MnO3 capacitor structures deposited on SrTiO3âSi substrates. Nanoscale Xâray diffraction is performed on single capacitors, and a structural phase transition from polar oâphase toward nonâpolar mâphase is demonstrated during the bipolar switching process. The energy landscape of multiphase HZO has been calculated at varying oxygen vacancy concentrations. Based on both theoretical and experimental results, it is found that a polar to nonâpolar phase transformation caused by oxygen vacancy redistribution during electric cycling is a likely explanation for fatigue in HZO
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