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Search Results: 1 - 10 of 2206 matches for " Sarmistha Banerjee "
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Radioactive Branching Using Dice  [PDF]
Sarmistha Sahu
Creative Education (CE) , 2012, DOI: 10.4236/ce.2012.35099
Abstract: Dice rolling (Emeric,1997) is a useful pedagogical tool (Arthur & Ian,2012; Todd, Clifton, Ingrid, Zdravko,2006)) to introduce students to the concepts and essential features of radioactivity. It can be extended to explain radioactive branching. In the process, the students learn about half life, decay constant and activity of a radioactive substance. Terms like stochastic processes, probability of decay, statistical fluctuations, and mutually exclusive processes; becomes clear in this process.
Nicotine Promotes Tumor Growth and Metastasis in Mouse Models of Lung Cancer
Rebecca Davis,Wasia Rizwani,Sarmistha Banerjee,Michelle Kovacs,Eric Haura,Domenico Coppola,Srikumar Chellappan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007524
Abstract: Nicotine is the major addictive component of tobacco smoke. Although nicotine is generally thought to have limited ability to initiate cancer, it can induce cell proliferation and angiogenesis in a variety of systems. These properties might enable nicotine to facilitate the growth of tumors already initiated. Here we show that nicotine significantly promotes the progression and metastasis of tumors in mouse models of lung cancer. This effect was observed when nicotine was administered through intraperitoneal injections, or through over-the-counter transdermal patches.
Probing the metastability of protoneutron star with hyperon in core-collapse supernova
Sarmistha Banik
Physics , 2014, DOI: 10.1103/PhysRevC.89.035807
Abstract: We investigate the role of hyperons in the dynamical collapse of a non-rotating massive star to a black hole(BH) using one dimensional general relativistic $GR1D$ code. We follow the dynamical formation and evolution of a protoneutron star (PNS) to a black hole using various progenitor models, adopting a hyperonic equation of state (EoS) generated by Shen et. al. We compare the results with those of nuclear EoS by Shen et. al. and understand the role of strange hyperons in the core collapse supernova. We discuss the neutrino signals that may be used as a probe to core collapse. Further, an exotic EoS can support a much lower maximum mass cold neutron star compared to PNS. In this regard, we also study the metastability of PNS in the presence of hyperon in the long-time evolution of the progenitors, relevant to supernova SN1987A.
Checkpointing with Minimal Recover in Adhocnet based TMR
Sarmistha Neogy
Computer Science , 2015, DOI: 10.5121/iju.2015.6403
Abstract: This paper describes two-fold approach towards utilizing Triple Modular Redundancy (TMR) in Wireless Adhoc Network (AdocNet). A distributed checkpointing and recovery protocol is proposed. The protocol eliminates useless checkpoints and helps in selecting only dependent processes in the concerned checkpointing interval, to recover. A process starts recovery from its last checkpoint only if it finds that it is dependent (directly or indirectly) on the faulty process. The recovery protocol also prevents the occurrence of missing or orphan messages. In AdocNet, a set of three nodes (connected to each other) is considered to form a TMR set, being designated as main, primary and secondary. A main node in one set may serve as primary or secondary in another. Computation is not triplicated, but checkpoint by main is duplicated in its primary so that primary can continue if main fails. Checkpoint by primary is then duplicated in secondary if primary fails too.
A Mobility-Based CheckPointing Protocol for Mobile Computing System
Suparna Biswas,Sarmistha Neogy
International Journal of Computer Science & Information Technology , 2010,
Abstract: A new checkpointing and failure recovery algorithm for mobile computing system is proposed here.Mobile hosts save checkpoints based on mobility and movement patterns.Movement patternsconsidered here are of three types – i) Intercell movement pattern ii) combination movement patternii) Intracell movement pattern. Mobile hosts save checkpoints when number of hand-off exceeds apredefined hand-off threshold value. Disconnection is a frequent phenomenon and is of two types: i)planned disconnection ii) unplanned disconnection.Hence mobile hosts save two types ofcheckpoints - i) permanent checkpoint based on hand-off threshold value covering unplanneddisconnection ii) migration checkpoint covering planned disconnection. Hand-off threshold is afunction mobility rate , movement pattern, message passing frequency and failure rate.
Securing Mobile Agents in MANET against Attacks using Trust
Chandreyee Chowdhury,Sarmistha Neogy
International Journal of Network Security & Its Applications , 2011,
Abstract: The emerging trend of using mobile agents for mobile adhoc network (MANET) applications intensifies the need for protecting them. Here we propose a distributed trust based framework to protect both the agents and the host platforms (running at the nodes) especially against threats of the underlying environment where agents may get killed or rerouted by visiting hosts. The best way to defend against this situation is to prevent both the hosts and agents from communicating with the malicious ones. In this regard this paper develops a distributed reputation model of MANET using concepts from DempsterShafer theory. The agents (deployed for some purposes like service discovery) while roaming in the networkwork collaboratively with the hosts they visit to form a consistent trust view of MANET. An agent may exchange information about suspected nodes with a visiting host. To speed up convergence, information about an unknown node can be solicited from trusted neighborhood. Thus an inactive node, without deploying agents may also get a partial view of the network. The agents can use combination ofencryption and digital signature to provide privacy and authentication services. Node mobility and theeffect of environmental noise are considered. The results show the robustness of our proposed scheme even in bigger networks.
Bose-Einstein condensation in dense matter and the third family of compact stars
Sarmistha Banik,Debades Bandyopadhyay
Physics , 2002, DOI: 10.1088/0954-3899/28/7/351
Abstract: We investigate antikaon condensation in compact star matter using a relativistic mean field model. Antikaon condensates make the equation of state softer resulting in a smaller maximum mass star compared to the case without condensate. It is found that the equation of state including antikaon condensates gives rise to a stable sequence of compact stars called the third family beyond the neutron star branch.
Color superconducting quark matter core in the third family of compact stars
Sarmistha Banik,Debades Bandyopadhyay
Physics , 2002, DOI: 10.1103/PhysRevD.67.123003
Abstract: We investigate first order phase transitions from $\beta$-equilibrated hadronic matter to color flavor locked quark matter in compact star interior. The hadronic phase including hyperons and Bose-Einstein condensate of $K^-$ mesons is described by the relativistic field theoretical model with density dependent meson-baryon couplings. The early appearance of hyperons and/or Bose-Einstein condensate of $K^-$ mesons delays the onset of phase transition to higher density. In the presence of hyperons and/or $K^-$ condensate, the overall equations of state become softer resulting in smaller maximum masses than the cases without hyperons and $K^-$ condensate. We find that the maximum mass neutron stars may contain a mixed phase core of hyperons, $K^-$ condensate and color superconducting quark matter. Depending on the parameter space, we also observe that there is a stable branch of superdense stars called the third family branch beyond the neutron star branch. Compact stars in the third family branch may contain pure color superconducting core and have radii smaller than those of the neutron star branch. Our results are compared with the recent observations on RX J185635-3754 and the recently measured mass-radius relationship by X-ray Multi Mirror-Newton Observatory.
Nucleation of antikaon condensed matter in proto neutron stars
Sarmistha Banik,Rana Nandi
Physics , 2011, DOI: 10.1063/1.3700566
Abstract: A first order phase transition from nuclear matter to antikaon condensed matter may proceed through thermal nucleation of a critical droplet of antikaon condensed matter during the early evolution of proto neutron stars (PNS). Droplets of new phase having radii larger than a critical radius would survive and grow, if the latent heat is transported from the droplet surface to the metastable phase. We investigate the effect of shear viscosity on the thermal nucleation time of the droplets of antikaon condensed matter. In this connection we particularly study the contribution of neutrinos in the shear viscosity and nucleation in PNS.
Exotic phases in compact stars
Sarmistha Banik,Debades Bandyopadhyay
Physics , 2003, DOI: 10.1088/0954-3899/30/1/063
Abstract: We discuss how the co-existence of hyperons, antikaon condensate and color superconducting quark matter in neutron star interior influences the gross properties of compact stars such as, the equation of state and mass-radius relationship. We compare our results with the recent observations. We also discuss about superdense stars in the third family branch which may contain a pure color-flavor-locked (CFL) core.
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