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Effect of Sm-Substitution on Structural, Electrical and Magnetic Properties of BiFeO3
Samita Pattanayak,R. N. P. Choudhary,Piyush R. Das 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
Samarium-modified bismuth ferrites (i.e., Bi1-xSmxFeO3 (BSFO; x = 0, 0.05, 0.15, 0.25) were synthesized in a single-phase by a solid-state reaction method. Preliminary x-ray structural analysis suggested that crystal structure of the material is rhombohedral for x = 0.0, 0.05, 0.15 and orthorhombic for x = 0.25 composition. The surface morphology and textures of the pellet samples, recorded by scanning electron microscope at room temperature, show uniform distribution of the different size of plate- and rod-shaped grains on the surface of the samples. The grain size generally decreases with increase of Sm-content in BSFO. Detailed studies of permittivity and impedance parameters of the samples in a wide frequency range (1 kHz - 1 MHz) at different temperatures (30°C - 450°C) provide many new and interesting results about relaxation processes. Room temperature magnetic hysteresis loops revealed that the spontaneous magnetization increases due to structural distortion and partial destruction of spiral spin structure caused by the substitution of Sm in BiFeO3. Enhancement in magneto-electric coupling coefficient of BFO was observed with increase of Sm in BSFO.
Hedging Effectiveness in Energy Market during Economic Crisis: Better Way to Integration
( Aristeidis Samitas ),( Ioannis Tsakalos ),( Nikolaos Eriotis ) 세종대학교 경제통합연구소(구 세종대학교 국제경제연구소) 2011 Journal of Economic Integration Vol.26 No.3
This paper investigates hedging and risk management options in the energy sector. Energy firms tend to adopt risk management tools in order to cover their financial exposure. Taking into consideration that current crisis has a significant effect on their value; we check whether energy firms actually have better output when they use hedging tools. In order to measure the effectiveness of this strategy in the energy industry, we adopt Tobin`s Q methodology. The sample of this study consists energy firms on a worldwide basis. The empirical evidence of this research confirms that energy firms may avoid huge economic problems when they adopt risk management methods. It is better enery market integration.
Emergency department and hospital crowding: causes, consequences, and cures
Peter Mckenna,Samita M Heslin,Peter Viccellio,William K Mallon,Cristina Hernandez,Eric J Morley 대한응급의학회 2019 Clinical and Experimental Emergency Medicine Vol.6 No.3
Overcrowding with associated delays in patient care is a problem faced by emergency departments (EDs) worldwide. ED overcrowding can be the result of poor ED department design and prolonged throughput due to staffing, ancillary service performance, and flow processes. As such, the problem may be addressed by process improvements within the ED. A broad body of literature demonstrates that ED overcrowding can be a function of hospital capacity rather than an ED specific issue. Lack of institutional capacity leads to boarding in the ED with resultant ED crowding. This is a problem not solvable by the ED and must be addressed as an institution-wide problem. This paper discusses the causes of ED overcrowding, provides a brief overview of the drastic consequences, and discusses possible cures that have been successfully implemented.
Financial Market Dynamics in an Enlarged European Union
( Dimitris Kenourgios ),( Aristeidis Samitas ),( Nikos Paltalidis ) 세종대학교 경제통합연구소 2009 Journal of Economic Integration Vol.24 No.2
This paper provides evidence of integration in European equity and bond markets over the period January 2, 1997 to October 1, 2006. Our focus is to examine time-varying correlation dynamics in Euro-area, Central European (CE) and Balkan financial markets, modifying the asymmetric generalized dynamic conditional correlation (AG-DCC) model developed by Cappiello, Engle and Sheppard (Journal of Financial Econometrics, 2006). Using structural breaks, we identify the optimal time decay where financial markets share highest comovement. The results show an increase in the level of dependence during the period of the internet bubble collapse (2000), the Balkan countries start formally discussions to join European Union (2000), the introduction of Euro banknotes and coins (2002) and the entry of CE countries in EU (2004). The CE European and Balkan countries become gradually more integrated with the EMU countries, which is consistent with the interpretation that these countries may be expected to join the Euro in the future.