A comprehensive numerical study is presented for the fully developed two-dimensional thermal flow of viscous incompressible fluid through a rotating curved rectangular duct of constant curvature 0.1 . Numerical calculations are carried... more
A comprehensive numerical study is presented for the fully developed two-dimensional thermal flow of viscous incompressible fluid through a rotating curved rectangular duct of constant curvature 0.1 . Numerical calculations are carried out by using a spectral method, and covering a wide range of the Taylor number 1000 Tr 3000 and the Dean number 100 Dn 1000 for the Grashof numberGr 100 . The outer wall of the duct is heated while the inner wall cooled. Flow characteristics are investigated for two cases of the duct rotation, Case I: Positive rotation and Case II: Negative rotation. For positive rotation, we investigate the unsteady flow characteristics for the Taylor number 0 Tr 3000 and it is found that the unsteady flow undergoes in the scenario ‘Chaotic multiperiodic periodic steady-state’, if Tr is increased in the positive direction. For negative rotation, however, we investigate the unsteady flow behavior for 1000 Tr 100 , and it is found that the unsteady flow undergoes through various flow instabilities, if Tr is increased in the negative direction. Contours of secondary flow patterns and temperature profiles are also obtained at several values of Tr, and it is found that there exist two- and multi-vortex solutions if the duct rotation is involved in both the directions.
The present study addresses numerical prediction of Dean-Taylor flow through a coiled rectangular duct of curvature 0.1. The spectral method is used as a rudimental tool to solve the system of non-linear partial differential equation of... more
The present study addresses numerical prediction of Dean-Taylor flow through a coiled rectangular duct of curvature 0.1. The spectral method is used as a rudimental tool to solve the system of non-linear partial differential equation of order two. The emerging parameters controlling the flow characteristics are the rotation parameter i.e. Tr, (incorporating Coriolis force), Grashof number (Gr), Prandtl number (Pr=7.0), aspect ratio (a=2), and pressure-driven parameter i.e. Dean number Dn (incorporating centrifugal force). The flow structures are explored for the effects of rotation parameter and pressure-driven parameter. We investigated unsteady flow characteristics for negative rotation of the duct for the Dean numbers Dn = 700 over the Taylor number ranging -500 to -10, and it is found that the unsteady flow undergoes through various flow instabilities, if Tr, is increased in the negative direction. Typical contours of secondary flow patterns and temperature profiles are obtained at several values of Tr, and it is seen that the unsteady flow consists of two-, three-, four-, five-, and six -vortex solutions. Convective heat transfer is also investigated, and it is observed that the chaotic flow enhances heat transfer more significantly than the steady-state or periodic solutions. Axial flow distribution is also calculated that is well-matched with the secondary flow patterns
Numerical study of unsteady fluid flow and heat transfer through a rotating curved rectangular channel with aspect ratio 2 and curvature ratio 0.05 has been performed by using a spectral-based numerical method, and covering a wide range... more
Numerical study of unsteady fluid flow and heat transfer through a rotating curved rectangular channel with aspect ratio 2 and curvature ratio 0.05 has been performed by using a spectral-based numerical method, and covering a wide range of the rotational parameter, the Taylor number Ta, for both the positive and negative rotation of the channel. In this paper, unsteady flow characteristics are investigated under combined action of the centrifugal, Coriolis and buoyancy forces for the Dean number De = 1000. For positive rotation, we investigated unsteady solutions for 0 ≤Ta ≤500, and it is found that the chaotic flow turns into steady-state flow through periodic or multi-periodic flows. For negative rotation, on the other hand, unsteady solutions are investigated for –500 ≤Ta≤0, and it is found that the unsteady flow undergoes through various flow instabilities. Typical contours of secondary flow patterns and temperature profiles are obtained at several values of Ta, and it is found ...
This paper proposes an action recognition framework for depth map sequences using the 3D Space-Time Auto-Correlation of Gradients (STACOG) algorithm. First, each depth map sequence is split into two sets of sub-sequences of two different... more
This paper proposes an action recognition framework for depth map sequences using the 3D Space-Time Auto-Correlation of Gradients (STACOG) algorithm. First, each depth map sequence is split into two sets of sub-sequences of two different frame lengths individually. Second, a number of Depth Motion Maps (DMMs) sequences from every set are generated and are fed into STACOG to find an auto-correlation feature vector. For two distinct sets of sub-sequences, two auto-correlation feature vectors are obtained and applied gradually to L2-regularized Collaborative Representation Classifier (L2-CRC) for computing a pair of sets of residual values. Next, the Logarithmic Opinion Pool (LOGP) rule is used to combine the two different outcomes of L2-CRC and to allocate an action label of the depth map sequence. Finally, our proposed framework is evaluated on three benchmark datasets named MSR-action 3D dataset, DHA dataset, and UTD-MHAD dataset. We compare the experimental results of our proposed ...
RNA silencing is mediated through RNA interference (RNAi) pathway gene families, i.e., Dicer-Like (DCL), Argonaute (AGO), and RNA-dependent RNA polymerase (RDR) and their cis-acting regulatory elements. The RNAi pathway is also directly... more
RNA silencing is mediated through RNA interference (RNAi) pathway gene families, i.e., Dicer-Like (DCL), Argonaute (AGO), and RNA-dependent RNA polymerase (RDR) and their cis-acting regulatory elements. The RNAi pathway is also directly connected with the post-transcriptional gene silencing (PTGS) mechanism, and the pathway controls eukaryotic gene regulation during growth, development, and stress response. Nevertheless, genome-wide identification of RNAi pathway gene families such as DCL, AGO, and RDR and their regulatory network analyses related to transcription factors have not been studied in many fruit crop species, including banana (Musa acuminata). In this study, we studied in silico genome-wide identification and characterization of DCL, AGO, and RDR genes in bananas thoroughly via integrated bioinformatics approaches. A genome-wide analysis identified 3 MaDCL, 13 MaAGO, and 5 MaRDR candidate genes based on multiple sequence alignment and phylogenetic tree related to the RNA...
