1,525,440 research outputs found
Recollections of a Hindu Hedonist
No full textNovelist Akhil Sharma grew up in a teetotaling Indian household. Here, he tells how discovering a passion for great wine helped him create a new identity out of a painful past
I Was Addicted to Sex With Married Women
No full textAs a young man, Akhil Sharma revelled in the most dangerous of liaisons, having sex with other men's wives – until the thrill began to pall
Maldives Resorts: Eco-Friendly Vacations
No full textLuxurious, exclusive and remote, the Maldives are the ultimate beach escape. They’re also a case study in the risks of global warming. Writer Akhil Sharma visits the country’s most eco-friendly resorts and discovers a remarkable cuisine worth protecting
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Nasira Sharma Interview
No full textThis interview with Nasira Sharma was recorded by Susham Bedi, a well-known Hindi novelist in her own right, as part of an ongoing project to record a variety of Hindi women writers’ thoughts on their own work. The writers discuss sources of inspiration, methods, and some of their own life stories.Asian Studie
70th Year of Independence: Still a Slave of Health Issues
Full text linkIndependence Day Editorial Comment By Dr. Vatsul Sharma (Editor-in-Chief, IHRJ) 
What’s in a Name?
Full text linkGuest Comment by Dr. Manisha Lakhanpal Sharma, Professor & Head, Department of Oral Medicine and Radiology, ITS Dental College, Hospital and Research Centre, Greater Noid
On the structure and origin of pressure fluctuations in wall turbulence: predictions based on the resolvent analysis
Full text linkWe generate predictions for the fluctuating pressure field in turbulent pipe flow by re-formulating the resolvent analysis of McKeon & Sharma (2010) in terms of the so-called primitive variables. Under this analysis, the nonlinear convective terms in the Fourier-transformed Navier-Stokes equations are treated as a forcing that is mapped to a velocity and pressure response by the resolvent of the linearized Navier-Stokes operator. At each wavenumber-frequency combination, the turbulent velocity and pressure field are represented by the most-amplified (rank-1) response modes, identified via a singular value decomposition of the resolvent. We show that these rank-1 response modes reconcile many of the key relationships between the velocity field, coherent structure (i.e., hairpin vortices), and the high-amplitude wall-pressure events observed in previous experiment and DNS. A Green’s function representation shows that the pressure fields obtained under this analysis correspond primarily to the fast pressure contribution arising from the linear interaction between the mean shear and the turbulent wall-normal velocity. Recovering the slow pressure requires an explicit treatment of the nonlinear interactions between the Fourier response modes. By considering the velocity and pressure fields associated with the triadically-consistent mode combination studied by Sharma & McKeon (2013), we identify the possibility of an apparent amplitude modulation effect in the pressure field, similar to that observed for the streamwise velocity field. However, unlike the streamwise velocity, for which the large scales of the flow are in phase with the envelope of the small-scale activity close to the wall, we expect there to be a ?/2 phase difference between the large scale wall-pressure and the envelope of the small-scale activity. Finally, we generate spectral predictions based on a rank-1 model assuming broadband forcing across all wavenumber-frequency combinations. Despite the significant simplifying assumptions, this approach reproduces trends observed in previous DNS for the wavenumber spectra of velocity and pressure, and for the scale-dependence of wall-pressure propagation speed
Petrobunus Sharma and Giribet 2011
No full textPetrobunus Sharma and Giribet, 2011 Petrobunus Sharma & Giribet, 2011: 112. Type species: Petrobunus schwendingeri Sharma and Giribet, 2011, by original designation. Distribution (Fig. 52). China (Chongqing, Hebei, Taiwan), Philippine (Palawan, Panay), Expansion of Penis (Figs. 37–45). Due the hydraulic pressure the glans exhibit a mix of two movements: The capsula externa have an erection movement changing the position (90–100 degrees) respect to the truncus axis and the capsula interna is everted. As result of the capsula interna movement the parastylar lobes are completely everted and folded against the capsula externa and the stylus fully exposed.Published as part of Zhang, Chao, Zhang, Feng & Sharma, Prashant P., 2018, Two new species of Petrobunus from China (Opiliones: Laniatores: Petrobunidae), pp. 51-64 in Zootaxa 4524 (1) on page 52, DOI: 10.11646/zootaxa.4524.1.3, http://zenodo.org/record/261031
Petrobunus Sharma & Giribet 2011
No full textKey to species of Petrobunus 1 Ocularium armed with a median tubercle (Sharma & Giribet, 2011:119, fig. 11b)............................ P. torosus - Ocularium unarmed.................................................................................... 2 2 Free tergites with conspicuous tubercles (Sharma & Giribet, 2011:116, fig. 7a; 118, fig. 10a)................... P. spinifer - Free tergites with granules or unarmed..................................................................... 3 3 Dorsal scutum or Opisthosomal sternite unarmed in male.......................................... P. hebei sp. nov. - Dorsal scutum or Opisthosomal sternite armed tubercles (Fig. 1) or spines (Sharma & Giribet, 2011:112, fig. 4b) in male... 4 4 Scutal area V and free tergites I and II of male armed with paired enlarged lateral tubercles, opisthosomal sternite 7 of male with two large setose spines............................................................. P. chongqing sp. nov. - Dorsal scutum unmared that of tubercles, opisthosomal sternite 7 of male with four large setose spines..... P. schwendingeriPublished as part of Zhang, Chao, Zhang, Feng & Sharma, Prashant P., 2018, Two new species of Petrobunus from China (Opiliones: Laniatores: Petrobunidae), pp. 51-64 in Zootaxa 4524 (1) on page 52, DOI: 10.11646/zootaxa.4524.1.3, http://zenodo.org/record/261031
Opposition control within the resolvent analysis framework
Full text linkThis paper extends the resolvent analysis of McKeon & Sharma (2010) to consider flow control techniques that employ linear control laws, focusing on opposition control (Choi et al. 1994) as an example. Under this formulation, the velocity field for turbulent pipe flow is decomposed into a series of highly amplified (rank-1) response modes, identified from a gain analysis of the Fourier-transformed Navier-Stokes equations. These rank-1 velocity responses represent propagating structures of given streamwise/spanwise wavelength and temporal frequency, whose wall-normal footprint depends on the phase speed of the mode. Opposition control, introduced via the boundary condition on wall-normal velocity, affects the amplification characteristics (and wall-normal structure) of these response modes; a decrease in gain indicates mode suppression, which leads to a decrease in the drag contribution from that mode. With basic assumptions, this rank-1 model reproduces trends observed in previous DNS and LES, without requiring high-performance computing facilities. Further, a wavenumber-frequency breakdown of control explains the deterioration of opposition control performance with increasing sensor elevation and Reynolds number. It is shown that slower-moving modes localized near the wall (i.e. attached modes) are suppressed by opposition control. Faster-moving detached modes, which are more energetic at higher Reynolds number and more likely to be detected by sensors far from the wall, are further amplified. These faster-moving modes require a phase lag between sensor and actuator velocity for suppression. Thus, the effectiveness of opposition control is determined by a trade-off between the modes detected by the sensor. However, it may be possible to develop control strategies optimized for individual modes. A brief exploration of such mode-optimized control suggests the potential for significant performance improvement
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