The equilibrium structures and cohesive energies of small Cun clusters using the full-potential muffin-tin orbitals (FP-LMTO) based molecular dynamics (MD) have been studied for n ≤ 9. The results obtained have been compared with other chemical methods. We propose the FP-LMTO-MD technique to be a useful starting point of more empirical methods which can efficiently deals with larger cluster sizes relevant for nanoparticles.
Abstract:In the process of analysing and interpreting medical data, various classification techniques have been widely applied with a lot of success. A number of classification algorithms are available for this purpose and many researchers face the problem of choosing the best method for a particular dataset. In this paper, we apply five well-known, rule-based classification techniques on different medical datasets and compare their relative merits and demerits. Subsequently, we interpret their applicability in classifying patients into groups.
We study the structure and electronic properties of small copper clusters using Equivalent Crystal Theory (ECT) and a parametrised LCAO method. The cluster geometry is optimised using ECT with Monte Carlo techniques. The LCAO method, particularly the parametrisation scheme due to Harrison, is then used to study the electronic properties of the optimised clusters.
Purpose
The purpose of this paper is to determine whether foreign exchange markets in India have become more efficient over time. There were two major developments in India’s foreign exchange market since the 1980s: first, a shift in foreign exchange management regime from a basket peg to a free float; and second, a rapid phase of economic liberalization since the mid-1990s. The paper attempts to find out whether the market efficiency of foreign exchange markets is affected by these developments. The paper mainly uses the well-known Hurst exponent calculated through corrected empirical R over S analysis to determine whether the exchange rates possess long memory. The robustness of the method is tested by calculating the Hurst exponent through two other prevalent methods in the literature.
Design/methodology/approach
The authors apply the corrected empirical Hurst exponent which employs the Anis Lloyd correction with the modification suggested by Weron. The sensitivity of the results is then tested by replicating the calculations using the detrended fluctuation analysis and Robinson’s method.
Findings
All the methods show that: first, there is no significant change in the overall efficiency of the foreign exchange market vis a vis the US$ for the time period from 1980 to 2017. Second, neither regime shifts nor calculations over sub-time periods is able to identify significant change in the efficiency level of the market for the US$ exchange rate. Third, efficiency of different exchange rate markets are different over the time period 1999–2017. The US$ market has unequivocally more long run memory compared to the GBP, Yen and EURO markets. Fourth, the results are robust to the method used for calculations.
Originality/value
Does the efficiency of asset markets evolve over time? This paper attempts to answer this question. In the process, the paper studies the effect of regime shifts and progressive globalization on the ability of the market to internalize information.
The structure and electronic properties of small nickel clusters are studied using Equivalent Crystal Theory (ECT) and a parametrised LCAO method. The minimum energy structure is obtained using ECT with Monte Carlo techniques. The LCAO method is then used to study the electronic properties of the optimised clusters.
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