Study of quenched impurities effect on order-disorder phase transition by Monte-Carlo method

We investigate the effect of quenched impurities on phase transition of layer particles. The study is done by means of Monte-Carlo technique on a fixed square lattice in the framework of the lattice gas model. The considered interactions are restricted to first neighboring particles and are of repulsive nature between diffusing particles. Attractive interactions between mobiles particles and impurities are considered. We focus on the behavior of the tracer diffusion coefficient, D*, and the mean square fluctuation of adsorbates particles number /. Our results show that the parameter controlling of phase transition are strongly influenced by the presence of the quenched impurities.We investigate the effect of quenched impurities on phase transition of layer particles. The study is done by means of Monte-Carlo technique on a fixed square lattice in the framework of the lattice gas model. The considered interactions are restricted to first neighboring particles and are of repulsive nature between diffusing particles. Attractive interactions between mobiles particles and impurities are considered. We focus on the behavior of the tracer diffusion coefficient, D*, and the mean square fluctuation of adsorbates particles number /. Our results show that the parameter controlling of phase transition are strongly influenced by the presence of the quenched impurities

Evaluation of 1,4-Benzothiazines in Steel Corrosion Inhibition in 15% HCl: Experimental and Theoretical Perspectives

Corrosion inhibitors are essential for metal protection. In this study, the efficacy of 1,4-Benzothiazine derivatives, particularly ethyl 3-hydroxy-2-(p-tolyl)-3,4-dihydro-2H-benzo[b][1,4]thiazine-3-carboxylate (EHBT) and 2-(4-chlorophenyl)-1,4-benzothiazin-3-one (CBT), was examined for carbon steel corrosion inhibition in 15 wt.% HCl. Techniques such as Electrochemical Impedance Spectroscopy (EIS), Potentiodynamic Polarization (PDP), weight loss measurement, and Scanning Electron Microscopy assessed the inhibitors' performance. Results showed inhibitor efficiency increased with concentration, with CBT and EHBT achieving up to 97% and 98% effectiveness respectively. Both acted as mixed inhibitors, reducing anodic and cathodic reactions. Adsorption of these molecules onto the steel surface was consistent with the Langmuir isotherm model, suggesting physical and chemical interaction. SEM analysis confirmed the protective layer formation by 1,4-Benzothiazine derivatives. Additionally, Quantum Chemical Calculations and Molecular Dynamics simulations provided insights into their interaction mechanisms on the Fe(110) surface. This research highlights the potential of 1,4-Benzothiazine derivatives in corrosion protection and paves the way for their further development

Stock price reaction to profit warnings: The role of time-varying betas

This study investigates the role of time-varying betas, event-induced variance and conditional heteroskedasticity in the estimation of abnormal returns around important news announcements. Our analysis is based on the stock price reaction to profit warnings issued by a sample of firms listed on the Hong Kong Stock Exchange. The standard event study methodology indicates the presence of price reversal patterns following both positive and negative warnings. However, incorporating time-varying betas, event-induced variance and conditional heteroskedasticity in the modelling process results in post-negative-warning price patterns that are consistent with the predictions of the efficient market hypothesis. These adjustments also cause the statistical significance of some post-positive-warning cumulative abnormal returns to disappear and their magnitude to drop to an extent that minor transaction costs would eliminate the profitability of the contrarian strategy

by Monte-Carlo method

of quenched impurities effect on order-disorder phase transitio

Value Gains on Flotation and IPO Underpricing

Utilising a unique dataset of 502 UK IPOs we undertake an empirical analysis of the relationship between underpricing and value gains on flotation. We find support for our hypothesis that IPO underpricing is related to the extent of anticipated value gains on the private to public transition. We analyse alternative driving mechanisms behind this relationship, and our results suggest that the underpricing of IPOs is driven by both underwriters and issuing company directors, each of whom derive net benefits over the longer term from underpricing at the IPO. Copyright 2006 The Authors Journal compilation (c) 2006 Blackwell Publishing Ltd.