384 research outputs found
Augmented-space cluster coherent potential approximation for binary random and short-range ordered alloys
No full textWe use the earlier ideas of Razee and Prasad [Phys. Rev. B 45, 3265 (1992); Phys. Rev. B 48, 1349 (1993)], Datta [Phys. Rev. B 48, 8567 (1993)], and Mookerjee and Prasad [Phys. Rev. B 48, 17724 (1993)] to propose and implement a cluster generalization of the coherent potential approximation within a tight-binding linear muffin-tin orbital minimal basis set for binary alloys which are either random or have short-range order. In particular, we shall apply the technique to the CuZn alloys and compare it with other approaches.</p
A phase-stability study of PdRh alloys
No full textThe aim of this communication is to apply the augmented-space recursion technique coupled with the orbital-peeling method, which was introduced by us earlier (Dasgupta I, Saha T and Mookerjee A 1995 Phys. Rev. B 51 3413) as a computationally powerful methodology, to study the phase stability of PdRh alloys
Erratum:Challenges of one-year longitudinal follow-up of a prospective, observational cohort study using an anonymised database: Recommendations for trainee research collaboratives (BMC Medical Research Methodology DOI: 10.1186/s12874-019-0857-y)
No full textIn the original publication of this article [1], the author should be only the collaboration group "STARSurg Collaborative". In the "STARSurg Collaborative", the author S. Mookerjee s name should be shown as the full name Souradip Mookerjee.</p
Content Provision Strategies in the Presence of Content Piracy
No full textWe consider a publisher that earns advertising revenue while providing content to serve a heterogeneous population of consumers. The consumers derive benefit from consuming content but suffer from delivery delays. A publisher's content provision strategy comprises two decisions: (a) the content quality (affecting consumption benefit) and (b) the content distribution delay (affecting consumption cost). The focus here is on how a publisher should choose the content provision strategy in the presence of a content pirate such as a peer-to-peer (P2P) network. Our study sheds light on how a publisher could leverage a pirate's presence to increase profits, even though the pirate essentially encroaches on the demand for the publisher's content. We find that a publisher should sometimes decrease the delivery speed but increase quality in the presence of a pirate (a quality focused strategy). At other times, a distribution focused strategy is better; namely, increase delivery speed, but lower quality. In most cases, however, we show that the publisher should improve at least one dimension of content provision (quality or delay) in the presence of a pirate. © 2012 INFORMS
Erratum:Challenges of one-year longitudinal follow-up of a prospective, observational cohort study using an anonymised database: Recommendations for trainee research collaboratives (BMC Medical Research Methodology DOI: 10.1186/s12874-019-0857-y)
No full textIn the original publication of this article [1], the author should be only the collaboration group "STARSurg Collaborative". In the "STARSurg Collaborative", the author S. Mookerjee s name should be shown as the full name Souradip Mookerjee.</p
Erratum:Challenges of one-year longitudinal follow-up of a prospective, observational cohort study using an anonymised database: Recommendations for trainee research collaboratives (BMC Medical Research Methodology DOI: 10.1186/s12874-019-0857-y)
No full textIn the original publication of this article [1], the author should be only the collaboration group "STARSurg Collaborative". In the "STARSurg Collaborative", the author S. Mookerjee s name should be shown as the full name Souradip Mookerjee.</p
Are New IT-Enabled Investment Opportunities Diminishing for Firms?
No full text Today, few firms could survive for very long without their computer systems. IT has permeated every corner of firms. Firms have reached the current state in their use of IT because IT has provided myriad opportunities for firms to improve performance and, firms have availed themselves of these opportunities. Some have argued, however, that the opportunities for firms to improve their performance through new uses of IT have been declining. Are the opportunities to use IT to improve firm performance diminishing? We sought to answer this question. In this study, we develop a theory and explain the logic behind our empirical analysis; an analysis that employs a different type of event study. Using the volatility of firms' stock prices to news signaling a change in economic conditions, we compare the stock price behavior of firms in the IT industry to firms in the utility and transportation and freight industries. Our analysis of the IT industry as a whole indicates that the opportunities for firms to use IT to improve their performance are not diminishing. However, there are sectors within the IT industry that no longer provide value-enhancing opportunities for firms. We also find that IT products that provided opportunities for firms to create value at one point in time, later become necessities for staying in business. Our results support the key assumption in our work. </jats:p
Dynamical mean-field theory of realistic spin glasses beyond independent-mode approximation. II. Effect of reaction field
No full textThe author extends the previous calculation on a dynamical mean-field theory of realistic spin glasses (Chowdhury and Mookerjee) so as to incorporate the effect of the reaction field. The 'ordering temperature' of a mode is shown to depend not only on the corresponding eigenvalue of the random matrix J but also on the structure of the whole spectrum
Influence of hydrologic and anthropogenic factors on the abundance variability of enteropathogens in the Ganges estuary, a cholera endemic region
No full textThis study deals with the influence of water physico-chemical properties, tides, rainfall and fecal pollution on the abundance of enteropathogens in a main distributary of the Ganges, in the endemic cholera belt of West Bengal. Between January and June 2011, water and sediments were sampled from two sites of the Hooghly River by Kolkata and Diamond Harbour. Counts of cultivable Vibrio (CVC, from ~ 102 to ~ 105 CFU/L) and total bacteria (TBC, from ~ 105 to ~ 109 CFU/L) increased with water temperature (17 °C to 37 °C). A combination of variations in tidal height, salinity and turbidity had a distinct influence on CVC, TBC and coliform counts. At Diamond Harbour, a salinity increase from 0.6 to 7.9 was accompanied by a 1000-fold amplification of initial CVC ~ 102 CFU/L, whereas higher prevalence of coliforms in Kolkata was related to greater disposal of untreated sewage into the river. Turbidity-dependent variation of CVC was noteworthy, particularly at Diamond Harbour, where CVC in intertidal surface sediments showed an analogous trend as in surface waters, suggesting bentho-pelagic coupling of Vibrio dynamics. Besides the influence of salinity variation with tidal cycles, sediment re-suspension from tidal flats can play a role on Vibrio abundance in aquatic ecosystems.Fil: Batabyal, Prasenjit. National Institute For Cholera And Enteric Diseases; IndiaFil: Einsporn, Marc H.. Leibniz Centre For Tropical Marine Ecology; AlemaniaFil: Mookerjee, Subham. National Institute For Cholera And Enteric Diseases; IndiaFil: Palit, Anup. National Institute For Cholera And Enteric Diseases; IndiaFil: Neogi, Sucharit B.. Osaka Prefecture University; Bangladesh. International Centre for Diarrheal Disease Research; BangladeshFil: Nair, Gopinath B.. National Institute For Cholera And Enteric Diseases; India. Translational Health Science and Technology Institute; IndiaFil: Lara, Ruben Jose. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentin
Hamas, Taliban and the Jewish Underground: An Economist's View of Radical Religious Militias
No full textCan rational choice modeling explain destructive behavior among the Taliban, Hama and other radical religious militias? This paper proposes a club good framework which emphasizes the function of voluntary religious organizations as efficient providers of local public goods in the absence of government provision. The sacrifices which these groups demand are economically efficient (as in Iannaccone (1992)) and make them well suited for solving the extreme principal-agent problems present in militia production. Thus the analysis can explain why religious radicals create such effective militias. Seemingly gratuitous acts of violence by group members destroy their outside options, increasing the incentive compatibility of loyalty. The analysis has clear implications for economic policy to contain militias.
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