1,950 research outputs found
A Unified Shell model for Buoyancy-Driven Turbulence
No full textWe construct a unified shell model for stably stratified and convective turbulence. Shell model simulation of stably stratified flow in turbulent regime exhibit Bolgiano-Obukhbov (BO) scaling in which the kinetic energy spectrum varies as . However, simulation of convective turbulence shows Kolmogorov's spectrum. These results are consistent with the direct numerical simulations of Kumar {\em et al.} [Phys. Rev. E {\bf 90}, 023016 (2014)]. We also observe a dual scaling ( and ) for a limited range of parameters in stably stratified flow
Sweeping has no effect on renormalized turbulent viscosity
No full textWe perform renormalization group analysis (RG) of the Navier-Stokes equation in the presence of constant mean velocity field , and show that the renormalized viscosity is unaffected by , thus negating the ``sweeping effect", proposed by Kraichnan [Phys. Fluids {\bf 7}, 1723 (1964)] using random Galilean invariance. Using direct numerical simulation, we show that the correlation functions for and differ from each other, but the renormalized viscosity for the two cases are the same. Our numerical results are consistent with the RG calculations
Energy transfers in small-scale and large-scale dynamos
No full textWe study energy transfers during magnetic energy growth in small-scale and large-scale dynamos. We perform direct numerical simulations for magnetic Prandtl number Pm =20 and 0.2 in a periodic box on 1024^3 grid. Energy fluxes and shell-to-shell energy transfers indicate that in small-scale dynamo for Pm =20, the magnetic energy growth takes place due to a non-local energy transfer from large-scale velocity field to small-scale magnetic field. On the other hand, in large-scale dynamo for Pm =0.2, local energy transfers from large-scale velocity field to large-scale magnetic field takes place
Obituary: Dr M.K. Bhan – A True Leader & Visionary
No full text12The author remembers Dr M.K. Bhan as a true leader, visionary, a passionate scientist, doctor and a wonderful human being, who has given love and affection to everyone around him
M.K. Asante: “It’s Bigger than Hip Hop: Art, Race and Politics”
No full textIncludes descriptive metadata provided by producer in MPEG-4 video file: "Arts and Culture - Video - M.K. Asante: 'It’s Bigger than Hip Hop: Art, Race and Politics.'" By M.K. Asante. Author and filmmaker Asante delivers the annual Walter R. Murray, Jr., Lecture on Oct. 20, 2010 at the Commons Center. He takes questions after his lecture
EVALUATION OF DAIRY AND CARCASS PERFORMANCES OF LESSER KNOWN GANG-FATEHPURI SHEEP OF UTTAR PRADESH
No full textM.K. Verma*1, V.K. Singh1, J. Singh1, A. K. Verma2and Rajesh Kumar
Author Correction: Long-range chiral exchange interaction in synthetic antiferromagnets
No full textIn the version of this Article originally published, the sentence ‘D.-S.H. wrote the paper with K.L., J.H. and M.K.’ in the author contributions was incorrect; it should have read ‘D.-S.H. wrote the paper with K.L., J.H., M.-H.J. and M.K.’ This has been corrected in the online versions of the Article
Implicit large-eddy simulation of the stratocumulus-topped boundary layer: A grid sensitivity study
No full textA range of implicit large-eddy simulations of the stratocumulus-topped boundary layer is performed to study the influence of grid resolution on selected parameters including liquid water path and second and third moments of vertical velocity fluctuations. The simulations are based on two sets of aircraft measurements, which are also used to evaluate the results of the simulations. The specific case presented here indicates that simulations with a grid aspect ratio accounting for the anisotropic nature of the turbulence near the surface and at the top of the boundary layer lead to better agreement with measurements than simulations with an isotropic grid
Author correction: Clear and transparent nanocrystals for infrared-responsive carrier transfer
No full textThe original version of this Article omitted the fourth author Taizo Yoshinaga, who is from the 'Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Japan'. Consequently, the third sentence of the Author Contributions, 'M.S. and M.K. synthesized the ITO NCs and ITO/semiconductor oxides' was revised to 'M.S., M.K. and T.Y. synthesized the ITO NCs and ITO/semiconductor oxides'. This has been corrected in both the PDF and HTML versions of the Article
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No full textVerma V.C., Agrawal S., Tripathi M.K., Kumar A. (2021) Millet Starch: Current Knowledge and Emerging Insights of Structure, Physiology, Glycaemic Attributes and Uses. In: Kumar A., Tripathi M.K., Joshi D., Kumar V. (eds) Millets and Millet Technology. Springer, Singapore.The risk of chronic diseases like diabetes, myocardial infarction, and obesity can be reduced by dietary changes and advance research in nutritional biology. Starch composition of millet grains is very high which almost accounts for 60–70% of millet grains and it tremendously affects the quality of millet-based products. Compared to the major cereals, the hypoglycaemic properties and other superior attributes of millet starch could make it a promising ingredient for the functional food industry. However, scanty knowledge on structural and functional attributes of millet starch seriously hinders further improvement of millets as functional and nutraceutical food. Here, we discussed the current knowledge and emerging insights of the isolation, structure, chemical composition, physicochemical properties, interaction with other constituents, and uses of millet starch. The aim of this chapter is to enlighten the benefits of millet starch and its uses in relation to reduce the risk of chronic disorders and enhance nutritional security.Not Availabl
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