273 research outputs found
Porous plates at incidence: Dataset
No full textThis dataset corresponds to the manuscript - porous plates at incidence. This paper investigates the effect of permeability on two-dimensional rectangular plates at incidences. The flow topology is investigated for Reynolds number () values between 30 and 90, and the forces on the plate are discussed for , where the wake is found to be steady for any value of the Darcy number () and the flow incidence (). At , for a plate normal to the stream and vanishing , the wake shows a vortex dipole with a stagnation point on the plate surface. With increasing , the separation between the vortex dipole and the plate increases; the vortex dipole shortens and is eventually annihilated at a critical . For any value of below the critical one, the vortex dipole disappears with decreasing . However, at low , the two saddle-node pairs merge at the same , annihilating the dipole; while at high , they merge at different , resulting in a single recirculating region for intermediate incidences. The magnitudes of lift, drag, and torque decrease with . Nevertheless, there exists a range of and , where the magnitude of the plate-wise force component increases with , driven by the shear on the plate's pressure side. Finally, the analysis of the fluid impulse suggests that the lift and drag reduction with are associated with the weakening of the leading and trailing edge shear layer, respectively. The present findings will be directly beneficial in understanding the role of permeability on small permeable bodies
Effect of a fixed downstream cylinder on the flow-induced vibration of an elastically supported primary cylinder
Full text linkThis paper numerically investigates the influence of a fixed downstream control cylinder on the flow-induced vibration of an elastically supported primary cylinder. These two cylinders are situated in a tandem arrangement with small dimensionless center-to-center spacing (L/D, L is the intermediate spacing and D is the cylinder diameter). The present two-dimensional (2D) simulations are carried out in the low Reynolds number (Re) regime. The primary focus of this study is to reveal the underlying flow physics behind the transition from vortex-induced vibration to galloping in the response of the primary cylinder due to the presence of another fixed downstream cylinder. Two distinct flow field regimes, namely, steady flow and alternate attachment regimes, are observed for different L/D and Re values. Depending on the evolution of the near-field flow structures, four different wake patterns, “2S,” “2P,” “2C,” and “aperiodic,” are observed. The corresponding vibration response of the upstream cylinder is characterized as interference galloping and extended vortex-induced vibration. As the L/D ratio increases, the lift enhancement due to flow-induced vibration is seen to be weakened. The detailed correlation between the force generation and the near-wake interactions is investigated. The present findings will augment our understanding of vibration reduction or flow-induced energy harvesting of tandem cylindrical structures.</p
A REVIEW OF CHANDAN BOSE\u27S PERSPECTIVES ON WORK, HOME, AND IDENTITY FROM ARTISANS IN TELANGANA: CONVERSATIONS AROUND CRAFT
No full textThis review considers Chandan Bose’s ethnographic study into arts and crafts practices in Telangana, India. Merits of the book include Bose’s nuanced interrogation of ethical complexities in and around ethnographic work, a centring of artisans’ voices through direct quotes, and an emphasis on knowledge as something crucially formed in and through subjective inter-relational connections. Bose draws links between practices of ethnography, art and storytelling. Broaching the book as a collaboration with rather than a study of the artisan community, Bose offers ways of re-seeing research, knowledge, and cultural engagement that will hold relevance across a wide range of fields and practices in and beyond contemporary academies
Perspectives on Work, Home, and Identity From Artisans in Telangana: Conversations Around Craft.
No full textProviding an ethnographic account of the everyday life of a household of artisans in the Telangana state of southern India, Chandan Bose engages with craft practice beyond the material (in this case, the region's characteristic murals, narrative cloth scrolls, and ritual masks and figurines). In situating the voice of the artisans themselves as the central focus of study, simultaneous and juxtaposing histories of craft practice emerge, through which artisans assemble narratives about work, home, and identity through multiple lenses. These perspectives include: the language artisans use to articulate their experience of materials, materiality, and the physical process of making; the shared and collective memory of practitioners through which they recount the genealogy of the practice; the everyday life of the household and its kinship practices, given the integration of the studio-space and the home-space; the negotiations between practitioners and the nation-state over matters of patronage; and the capacities of artisans to both conform to and affect the practices of the neo-liberal market
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‘Writing practices’ and Writing ‘practices’: observation and struggle in fieldnotes about artisanal work
Full text linkThis chapter presents a series of curated fieldnotes as a way to investigate a tension that is implicit in all ethnographic research on craft and other skilled activities: that what one can observe, and therefore what one records in fieldnotes, is not directly or wholly the subject of study. Through excerpts from fieldnotes that I made during twenty-two months of ethnographic research with woodcarvers and painters in San Martín Tilcajete, in the state of Oaxaca, Mexico, I show how the attempt to ‘get at’ artisanal practice through observation not only is a struggle for understanding and analysis but is also a struggle about how and what to write. Although many researchers have avoided the analytical impasse by utilising ‘apprenticeship’ as a research methodology and technique, the chapter shows that the problems of writing do not necessarily disappear when attention is focused on the researcher’s own practices rather than those of her research participants. The chapter concludes that although apprenticeship as a research method does afford an embodied and perceptive understanding of craft practices, the struggle of writing may signal something important about artisanal work that cannot be so easily captured in notes, photographs, film, or other media
Sir Jagadish Chandra Bose: Tribute on his 160<sup>th</sup> Birth Anniversary
No full text30-31Physicist, Botanist, Biologist, Archaeologist, and Radio & Microwave Technologist – Jagadish Chandra Bose was all this and much more
Introduction to and application of synchronization theory
No full text<p><strong>Abstract of the lecture</strong></p>
<p>In nature, oscillations are one of the main forms of motion and these oscillating systems are not isolated. So, they interact, communicate in different kinds of complex ways. With this, synchronization is the most fundamental phenomenon exhibited by these systems. In the first part this talk, the basics of synchronization theory will be discussed. Applications of synchronization theory will be demonstrated in different engineering and natural systems, in the second part of my lecture. The engineering systems include thermoacoustic system, aeroelastic system, and natural circulation loop. Through these applications, we will discuss how synchronization theory helps not only describing different transitional phenomena but also indicating the possible control measures.</p>
<p><strong>References:</strong></p>
<ol>
<li>Mondal, S., Unni, V. R., & Sujith, R. I. (2017). Onset of thermoacoustic instability in turbulent combustors: an emergence of synchronized periodicity through formation of chimera-like states. Journal of Fluid Mechanics, 811, 659.</li>
<li>Mondal, S., Pawar, S. A., & Sujith, R. I. (2017). Synchronous behaviour of two interacting oscillatory systems undergoing quasiperiodic route to chaos. Chaos: An Interdisciplinary Journal of Nonlinear Science, 27(10), 103119.</li>
<li>Thomas, N., Mondal, S., Pawar, S. A., & Sujith, R. I. (2018). Effect of time-delay and dissipative coupling on amplitude death in coupled thermoacoustic oscillators. Chaos: An Interdisciplinary Journal of Nonlinear Science, 28(3), 033119.</li>
<li>Dange, S., Manoj, K., Banerjee, S., Pawar, S. A., Mondal, S., & Sujith, R. I. (2019). Oscillation quenching and phase-flip bifurcation in coupled thermoacoustic systems. Chaos: An Interdisciplinary Journal of Nonlinear Science, 29(9), 093135.</li>
<li>Raaj, A., Venkatramani, J., & Mondal, S. (2019). Synchronization of pitch and plunge motions during intermittency route to aeroelastic flutter. Chaos: An Interdisciplinary Journal of Nonlinear Science, 29(4), 043129.</li>
<li>Mondal, S., Pawar, S. A., & Sujith, R. I. (2019). Forced synchronization and asynchronous quenching of periodic oscillations in a thermoacoustic system. Journal of Fluid Mechanics, 864, 73-96.</li>
<li>Roy, A., Mondal, S., Pawar, S. A., & Sujith, R. I. (2020). On the mechanism of open-loop control of thermoacoustic instability in a laminar premixed combustor. Journal of Fluid Mechanics, 884.</li>
</ol>
Perspectives on Work, Home, and Identity From Artisans in Telangana [electronic resource] : Conversations Around Craft /
No full textProviding an ethnographic account of the everyday life of a household of artisans in the Telangana state of southern India, Chandan Bose engages with craft practice beyond the material (in this case, the region's characteristic murals, narrative cloth scrolls, and ritual masks and figurines). In situating the voice of the artisans themselves as the central focus of study, simultaneous and juxtaposing histories of craft practice emerge, through which artisans assemble narratives about work, home, and identity through multiple lenses. These perspectives include: the language artisans use to articulate their experience of materials, materiality, and the physical process of making; the shared and collective memory of practitioners through which they recount the genealogy of the practice; the everyday life of the household and its kinship practices, given the integration of the studio-space and the home-space; the negotiations between practitioners and the nation-state over matters of patronage; and the capacities of artisans to both conform to and affect the practices of the neo-liberal market.Providing an ethnographic account of the everyday life of a household of artisans in the Telangana state of southern India, Chandan Bose engages with craft practice beyond the material (in this case, the region's characteristic murals, narrative cloth scrolls, and ritual masks and figurines). In situating the voice of the artisans themselves as the central focus of study, simultaneous and juxtaposing histories of craft practice emerge, through which artisans assemble narratives about work, home, and identity through multiple lenses. These perspectives include: the language artisans use to articulate their experience of materials, materiality, and the physical process of making; the shared and collective memory of practitioners through which they recount the genealogy of the practice; the everyday life of the household and its kinship practices, given the integration of the studio-space and the home-space; the negotiations between practitioners and the nation-state over matters of patronage; and the capacities of artisans to both conform to and affect the practices of the neo-liberal market
How Does Law Prescribe Circulation of Children? Understanding Different Kinds of Movement Within the Adoption Law in India
No full textThis article looks at how adoption law prescribes correct contexts for the legitimate movement of children. It is specifically an analysis of the Adoption Regulation of India, 2017, and the Juvenile Justice Act 2015, and the way in which they warrant three kinds of movement of children through adoption: ‘abandonment’/’surrender’, ‘return’ and ‘giving and taking’. By investigating the precise way in which law formulates definition of these terms, this article attempts to understand how legal terminology comes to affect the kind of sites that the biological family, the state and the adoptive family end up becoming. © The Author(s) 2021
Of the people, by the people, for the people: in defense of American pop culture, its meaning, and its impact
No full textAmerican pop culture has often been subjected to scorn and ridicule, both at home and abroad, often by those who view it as being immoral or who view it as not being “true” culture. This begs the questions of what exactly are the characteristics of American pop culture, why did it develop along the lines it has, and what are its sociological implications. One can examine the issue by delving into American history, and tracing how American mainstream thought has informed cultural practice. The results of such a study show that the characteristics of American pop culture were directly shaped by the ideals expressed in the American Revolution, and that American pop culture has often been at the heart of a generations-long push towards greater social freedom.M.A.Includes bibliographical referencesIncludes vitaby Avinash R. Chanda
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