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| 1 | Effect of pouring temperature on cooling slope casting of semi-solid Al-Si-Mg alloy显示文摘Present trend of semi-solid processing is directed towards rheocasting route which allows manufacturing of near-net-shape cast components directly from the prepared semi-solid slurry. Generation of globular equi-axed grains during solidification of rheocast components, compared to the columnar dendritic structure of conventional casting routes, facilitates the manufacturing of components with improved mechanical properties and structural integrity. In the present investigation, a cooling slope has been designed and indigenously fabricated to produce semi solid slurry of Al-Si-Mg (A356) alloy and successively cast in a metallic mould. The scope of the present work discusses about development of a numerical model to simulate the liquid metal flow through cooling slope using Eulerian two-phase flow approach and to investigate the effect of pouring temperature on cooling slope semi-solid slurry generation process. The two phases considered in the present model are liquid metal and air. Solid fraction evolution of the solidifying melt is tracked at different locations of the cooling slope, following Schiel s equation. The continuity equation, momentum equation and energy equation are solved considering thin wall boundary condition approach. During solidification of the liquid metal, a modified temperature recovery scheme has been employed taking care of the latent heat release and change of fraction of liquid. The results obtained from simulations are compared with experimental findings and good agreement has been found. | Prosenjit Das Sudip K. Samanta Himadri Chattopadhyay Pradip Dutta | 2012 | Acta Metallurgica Sinica(English Letters)2012，25，5： | 4 |
| 2 | Kinetics of Biodegradation of p-Nitrophenol by Different Bacteria 显示文摘 | Bharat Bhushan Ashvini Chauhan Sudip K Samanta | 2000 | Biochemical and Biophysical Research Communications2000，3，11： | 1 |
| 3 | EFFECT OF KAIROMONE ON PREDATOR-PREY DYNAMICS -- A DELAY MODEL显示文摘 | SUDIP SAMANTA JOYDEV CHATTOPADHYA* | 2013 | International Journal of Biomathematics2013，6，5： | 1 |
| 4 | Propagating disturbances along fan-like coronal loops in an active region显示文摘Propagating disturbances are often observed in active region fan-like coronal loops. They were thought to be due to slow mode magnetohydrodynamic waves based on some of the observed properties. However, recent studies involving spectroscopy indicate that they could be due to high speed quasi-periodic upflows which are difficult to distinguish from upward propagating slow waves. In this context, we have studied a fan loop structure in the active region AR 11465 using simultaneous spectroscopic and imaging observations from the Extreme Ultraviolet Imaging Spectrometer onboard Hinode and Atmospheric Imaging Assembly onboard Solar Dynamics Observatory. Analysis of the data shows significant oscillations at different locations. We explore the variations in different line parameters to determine whether the waves or flows could cause these oscillations to improve the current understanding of the nature of these disturbances. | Sudip Mandal Tanmoy Samanta Dipankar Banerjee S.Krishna Prasad Luca Teriaca | 2015 | Research in Astronomy and Astrophysics2015，15，11： | 0 |
| 5 | Study of a crop-pest-natural enemy model with Z-type control——An approach to pest management显示文摘In this study,the Z-type control method is applied to an intraguild crop-pest-natural enemy model,assuming that the natural enemy can predate on both crop and pest populations.For this purpose,the indirect Z-type controller is considered in the natural enemy population.After providing the design function for the crop-pest-natural enemy model with Z-control,we find the analytical expression of the update parameter.The findings indicate that the uncontrolled system can produce chaos through perioddoubling bifurcation due to crop over-consumption by the pest population.We draw a Poincare map to confirm the occurrence of chaos and compute the maximum Lyapunov exponent.As the observations further indicate that the pest population can be controlled by using an indirect Z-control mechanism in the natural enemy population,we postulate that,if natural enemy abundance can be governed by the update parameter,any desired pest population abundance can be achieved through the proposed Z-type controller,thus controlling the pest.To verify these assertions,extensive numerical simulations are performed to explore the potential for practical application of the proposed Z-type controller. | Dibyendu Sekhar Mandal Sudip Samanta Rana D.Parshad Abdennasser Chekroun Mohamed Helal Joydev Chattopadhyay | 2023 | International Journal of Biomathematics2023，16，4： | 0 |
| 6 | Effect of multiple delays on the dynamics of cannibalistic prey-predator system with disease in both populations显示文摘 | Santosh Biswas Sudip Samanta Qamar J. A. Khan Joydev Chattopadhyayt | 2017 | International Journal of Biomathematics2017，10，4： | 0 |
| 7 | Study of an epidemic model with Z-type control显示文摘In the present paper,an epidemic model with Z-type control mechanism has been pro- posed and analyzed to explore the disease control strategy on an infectious disease outbreak.The uncontrolled model can have a disease-free equilibrium and an endemic equilibrium.The expression of the basic reproduction number and the conditions for the stability of the equilibria are derived.It is also observed that the disease-free equilibrium is globally asymptotically stable if R0<1,whereas the endemic equilibrium is globally asymptotically stable if R0>1.The model is further improved by considering Z-control mechanism and investigated.Disease can be controlled by using Z-control while the basic reproduction of the uncontrolled system is greater than unity.The positivity conditions of the solutions are derived and the basin of attraction for successful implementation of Z-control mechanism is also investigated.To verify the analytical findings,extensive numerical simulations on the model are carried out. | Sudip Samanta | 2018 | International Journal of Biomathematics2018，11，7： | 0 |
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