98 research outputs found
Book review: Age of entanglement: German and Indian intellectuals across Empire by Kris Manjapara
No full text"Age of Entanglement: German and Indian Intellectuals across Empire." Kris Manjapara. Harvard University Press. January 2014. --- In this book, Kris Manjapara sets out to explore patterns of connection linking German and Indian intellectuals from the nineteenth century to the years after the Second World War. The author attempts to trace the intersecting ideas and careers of a diverse collection of individuals from South Asia and Central Europe who shared ideas, formed networks, and studied one another’s worlds. Ankit Kumar recommends this book to those studying world history, geopolitics, postcolonialism and development
RETRACTED ARTICLE: Psychological predictors behind the intention to drink and drive among female drivers: Application of extended theory of planned behavior
No full textWe, the Editor and Publisher of Traffic Injury Prevention, have retracted the following article: Ankit Kumar Yadav. Psychological predictors behind the intention to drink and drive among female drivers: Application of extended theory of planned behavior. Traffic Injury Prevention. 2020. https://doi.org/10.1080/15389588.2019.1703961. The author has requested the retraction of his article due to an error in one of the collected psychological measures. During data extraction, the responses for ‘attitude’ and ‘intention’ measures were switched and may have influenced the findings from the developed regression model and its results. As a result, the Editor and Publisher have agreed to retract the article in full. We have investigated and have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines on retractions. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as “Retracted”.</p
Constructing an inclusive vision of sustainable transition to decentralised energy: Local practices, knowledge, values and narratives in the case of community-managed grids in rural India
No full textThis chapter claims that the global North’s vision of sustainable energy transition (SET), which informs policies and infrastructure developments, holds a partial account of diverse energy-related practices and associated values that are endemic to local communities. Referring to the EU directive, this chapter points towards the implicit bias about the role of advanced technologies in SET. The vision of SET expressed in the EU directive has the interlocked relation with market designs, economic growth and underlying rational values that might result in a mismatch with needs, values and practices of local communities. This chapter presents empirical observations from an ethnographic field-research on community-managed solar mini-grids in rural India to hint at alternative possibilities and contribute to a more inclusive vision of SET. In particular, it demonstrates that practices of improvisation, redistribution of energy and adaptation of mini-grid informed by the villagers’ social, cultural and economic needs are entangled with local knowledge and values. By learning from the local practices, knowledge, values and narratives with energy technologies, this chapter proposes to take a step towards a “big picture” of the sustainable transition to decentralised energy.Ethics & Philosophy of TechnologyDesign Conceptualization and Communicatio
Charged participants and their electromagnetic fields in an expanding fluid
No full textWe investigate the space-time dependence of electromagnetic fields produced by charged participants in an expanding fluid. To address this problem, we need to solve the Maxwell's equations coupled to the hydrodynamics conservation equation, specifically the relativistic magnetohydrodynamics (RMHD) equations, since the charged participants move with the flow. To gain analytical insight, we approximate the problem by solving the equations in a fixed background Bjorken flow, onto which we solve Maxwell's equations. The dynamical electromagnetic fields interact with the fluid's kinematic quantities such as the shear tensor and the expansion scalar, leading to additional non-trivial coupling. We use mode decomposition of Green's function to solve the resulting non-linear coupled wave equations. We then use this function to calculate the electromagnetic field for two test cases: a point source and a transverse charge distribution. The results show that the resulting magnetic field vanishes at very early times, grows, and eventually falls at later times
Slicing of Web Applications Using Source Code Analysis
No full textProgram slicing revealed a useful way to limit the search of software defects during debugging and to better understand the decomposition of the application into computations. The web application is very widely used for spreading business throughout the world. To meet the desire of the customers, web applications should have more quality and robustness. Slicing, in the ?eld of web application, helps disclosing relevant information and understanding the internal system structure. This in turn helps in debugging, testing and in improving the program comprehensibility. The system dependence graph is an appropriate data structure for slice computation, in that it explicitly represents all dependencies that have to be taken into account in slice determination. We have extended the system dependence graph to Web-Application Dependence Graph (WADG). We have developed a partial tool for automatic generation of the WADG and computation of slices. In our literature survey, we found that most of the automatic graph generation tools are byte-code based. But, our tool uses the dependency analysis from the source code of the given program. We have presented three case studies by taking open source web programs and applying our techniques and slicing algorithm. We have found that the slices computed is correct and precise, which will be help full for program debugging and testing. Construction of the system dependence graph for Web applications is complicated by the presence of dynamic code. In fact, a Web application builds the HTML code to be transmitted to the browser at run time. Knowledge of such code is essential for slicing
Heat transfer in Sisko fluid past an unsteady stretching surface with heat source/sink and viscous dissipation effects
No full textWave Phenomena In General Relativistic Magnetohydrodynamics
No full textHere we study the wave propagation and stability of general relativistic
non-resistive dissipative second-order magnetohydrodynamic equations in curved
space-time. We solve the Boltzmann equation for a system of particles and
antiparticles using the relaxation time approximation and the
Chapman-Enskog-like gradient expansion for the off-equilibrium distribution
function, truncating beyond second-order in curved space-time in
electromagnetic fields. Unlike holographic calculation~\cite{Baier:2007ix}, we
show that the viscous evolution equations do not explicitly depend on the
curvature of space-time. Also, we have tested the causality and stability of
the second-order theory in curved space-time in the presence of linearised
metric perturbation and derived dispersion relations for various modes.
Interestingly, we found the coupling of gravitational modes with the usual
magneto-sonic modes in the small wave-number limit. Also, we show additional
non-hydrodynamical modes arise due to gravity for a bulk-viscous fluid.Comment: 17 pages, 2 figure
Charged participants and their electromagnetic fields in an expanding fluid
No full textWe investigate the space-time dependence of electromagnetic fields produced
by charged participants in an expanding fluid. To address this problem, we need
to solve the Maxwell's equations coupled to the hydrodynamics conservation
equation, specifically the relativistic magnetohydrodynamics (RMHD) equations,
since the charged participants move with the flow. To gain analytical insight,
we approximate the problem by solving the equations in a fixed background
Bjorken flow, onto which we solve Maxwell's equations. The dynamical
electromagnetic fields interact with the fluid's kinematic quantities such as
the shear tensor and the expansion scalar, leading to additional non-trivial
coupling. We use mode decomposition of Green's function to solve the resulting
non-linear coupled wave equations. We then use this function to calculate the
electromagnetic field for two test cases: a point source and a transverse
charge distribution. The results show that the resulting magnetic field
vanishes at very early times, grows, and eventually falls at later times.Comment: 13 pages, 5 figures. Minor revisions and a new figure showing domain
of influence adde
The Effect of Liquid Film on Cavity Filling
No full textNoise generated due to flow over corrugated pipes has extensively been studied, because of its presence in various engineering applications. Flexible risers used in the oil and gas industry are one of these applications, where noise is produced due to corrugations present at the innermost layer of the riser. Dry-gas flow through a corrugated pipe generates an unstable shear layer over each of the corrugations. Under certain conditions, this shear layer can roll up into discrete vortices, which impinge on the downstream cavity edge, producing pressure pulsations. When the frequency of impingement matches with one of the natural pipe frequencies, a ‘lock-in’ mechanism causes intensification of the associated noise and vibrations, which can have serious implications on the structural integrity of the corrugated pipe. This phenomenon is called Flow Induced Pulsations (FIP). Liquid injection in a corrugated pipe with gas flow has shown the potential to mitigate whistling caused by FIP. A number of mechanisms play a role in the whistling mitigation. It is shown in literature that the filling of cavities due to liquid film or rivulets present on the pipe wall is an important mechanism. The cavity filling results in an altered cavity geometry, which changes the shear layer dynamics. The effect of liquid and gas flow rate on the cavity filling, however, remains unknown. The present work aims to study the liquid filling behaviour of a single cavity, due to a gas flow driven liquid film. An experimental setup is constructed which consists of a rectangular channel containing a cavity. Liquid is injected in the channel as a film at the channel wall, which is driven upward by gas flow. The liquid film thickness upstream of the cavity is measured first, followed by the cavity filling itself. Both measurements are performed using a Laser Induced Fluorescence (LIF) based technique. After several post-processing steps, the film thickness and cavity filling are quantified. At low liquid flow rates, a partial film is created at the channel wall with a dry patch at the center. Increasing the liquid flow rate results in a full film covering the entire channel width. The film thickness varies in the transverse direction due to the presence of localized horseshoe shaped disturbance waves on the liquid film. Overall, the film cross-sectional area increases with increasing liquid flow rate, either due to an increase in film thickness of full films, or an increase in width of the partial films. The liquid film fills up the cavity, accumulating mainly at the upstream edge. The downstream edge remains relatively free from liquid. The amount of filling is found to increase with increasing local film thickness at the measurement position away from the channel side-wall. Changes in the cavity geometry due to liquid filling are estimated based on the cavity effective depth and length. The effective cavity depth does not significantly change and only decreases by 8% with a 25% increase in filling ratio. However, the effective length decreases substantially by 30% with a 25% increase in filling ratio. This could lead to a mode parameter value (ratio of cavity length to incoming gas momentum thickness), such that it does not fall in the range where whistling is observed, resulting in mitigation of whistling
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