No abstract

No abstract

In this investigation, the inhibitory effect of a new synthesised tetra‐dentate Schiff‐base, bis‐(2‐hydroxy‐1‐naphthaldehyde) 1,6‐hexadiamine (A1), on the corrosion of carbon steel in 1 M HCl and 0.5 M H2SO4 media solutions was studied using various techniques including electrochemical impedance spectroscopy polarisation curves and weight loss. The new compound was shown to be a very good inhibitor and had better behaviour in 1 M HCl than was the case in 0.5 M H2SO4. Potentiodynamic polarisation tests showed that this inhibitor had both cathodic and anodic action. Changes in Tafel and impedance parameters (Icorr, Rct and Cdl) indicated that the absorbed protective film grows with increasing exposure time and concentration of inhibitor. The maximum inhibition efficiency was approximately 97 per cent and 95 per cent at 100 ppm (A1) in 1 M HCl and 0.5 M H2SO4. The adsorption of this inhibitor on a carbon steel surface in both acidic media followed Langmuir adsorption isotherm behaviour.

No abstract

Introduction: Drug dependence and the resultant problems notably decrease the quality of life (QOL). Measuring the QOL in persons who use drugs (PWUD s) and planning to improve it can be helpful for rehabilitation programs. Given the absence of a standard tool to measure the quality of life of PWUD, the present study is an attempt to validate psychometric and cultural characteristics of non-injection drug users' QOL scale. Method: The study was carried out as a validation and methodological work. The study population consisted of 273 PWUDs in Kermanshah-based drug clinics including outgoing and hospitalized patients. The participants were selected through convenient-quota sampling. After securing the required permission from the copyright owner of the tool, it was forward/backward translated. Face validity and content validity were determined quantitatively and qualitatively. To examine construct validity of the tool, explorative factor analysis and confirmatory factor analysis were used. Internal consistency was measured using Cronbach's alpha and statistical analyses were performed using SPSS (v.25) and LISREL (v.8). Results: Explorative factor analysis (EFA) and confirmatory factor analysis (CFA) results supported the tool with one factor and 22 items. The R2 index in the model was equal to 0.99, which means that 99% of the variation of dependent variable (total score of QOL) is attributed to independent variable (22 statements). In other words, 99% of the variation of dependent variable is due to the independent variables in the model. The main indices of the model based on CFA all were higher than 0.9, which indicates goodness of fit of the model (χ2/DF = 2.18, CFI, NFI, TLI = 0.93 GF = 0.84, REMSEA = 0.066, R2 = 0.99). The correlative coefficient was significant (p < 0.05). The reliability of the tool based on internal consistency (Cronbach's alpha) for the subscales ranged from 0.84 to 0.85 and equal to 0.84 for the whole tool. Conclusion: The Farsi version of non-injection drug users' QOL scale had acceptable indices and it was applicable to assess QOL in the target population. The tool can be used in different fields of drug addiction.