Mass transfer coefficients are one of the most important parameters for the design of liquid-liquid extraction columns. The mass transfer coefficients of single drops in a pilot structured packed column have been measured using toluene/acetic acid/water and n-butyl acetate/acetic acid/water systems. Current research shows that theoretical models have failed to predict mass transfer coefficient precisely and are not reliable for design. In this work an empirical correlation for prediction of enhancement factor is developed. Dispersed phase mass transfer coefficients predicted by the proposed correlation are in good compatibility with experimental results.Les coefficients de transfert de masse figurent parmi les paramètres les plus importantsà prendre en compte lors de la conception de colonnes d'extraction liquide-liquide. Les coefficients de transfert de masse de chaque goutte dans une colonneà garnissage structuré pilote ontété mesurés grâceà des systèmesà base de toluène/d'acide acétique/d'eau et d'acétate de n-butyle/d'acide acétique/et d'eau. La comparaison entre les modèles théoriques et les résultats expérimentaux de coefficients de transfert de masse a montré que ces modèles ne sont pas assez précis pour etre appliquésà la conception. Dans cette recherche, les facteurs d'accentuation du coefficient de diffusion ontété déterminés expérimentalement et une corrélation empirique aété atteinte pour le facteur d'accentuation. Les coefficients de transfert de masse de la phase dispersée qui avaitété prévus grâceà la corrélation proposée s'harmonisent bien aux résultats des expériences.

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Background: A knowledge-oriented organizational culture (OC) is the cornerstone of the educational environment and is among the most important factors in knowledge management (KM) among the members of an organization. Objectives:This study aimed at investigating the effect of OC on the implementation of KM in teaching hospitals of Qom province, Iran.Methods: This descriptive-analytical study was carried out on 570 staff of teaching hospitals in 2017. A standard researcher-made instrument was used to collect data. The validity and reliability of the questionnaire were confirmed by the CVR and CVI. The mean values of these items were 0.88 and 0.82, respectively, and Cronbach's alpha coefficient for all items was found to be 0.97. In addition, convergent and discriminant validities were used to determine its construct validity. Data were analyzed using exploratory factor analysis, confirmatory factor analysis, and structural equation modeling by SPSS and LISREL 8.8.Results: It was found that 66.7% of the participants were female. The mean scores of KM and OC were 3.35 ± 0.816 and 3.12 ± 1.20, respectively. According to the results of exploratory factor analysis, the Kaiser-Meyer-Olkin measure was 0.962 and the Bartlett test result was significant (P < 0.001). The SEM analysis indicated the good fit of the model (χ 2 /df = 2.12, RMSEA = 0.04, GFI = 0.95, AGFI = 0.93). Moreover, the test results and fit indices showed the significance of trust culture (β = 0.37, t-value = 4.60) and collaboration culture (β = 0.32, t-value = 4.05), whereas learning culture (β = 0.11, t-value = 1.10) was insignificant.Conclusions: Since the mean scores of KM and OC components were moderate, it is suggested that specific programs be implemented in teaching hospitals concerning trust and collaboration culture issues to improve the current culture. Furthermore, the current model proposed a framework for the improvement of KM implementation in teaching hospitals.

Background and Objectives: Tuberculosis is an infectious disease caused by Mycobacterium tuberculosis. It is the tenth leading cause of death in the world. Despite the implementation of an effective prevention and treatment plan, the expected success in reducing and controlling TB cases has not yet been achieved. The aim of this study was to determine the effect of education based on health belief model developed with social support on the promotion of self-care behaviors of patients with smear-positive pulmonary tuberculosis in Qom province in 2019. Methods: 80 patients with smear-positive pulmonary tuberculosis Patient being treated at Qom Health Center were included in this educational intervention study. Patients were randomly divided into experimental (n= 40) and control (n= 40) groups. The educational intervention was performed in three sessions of 45 minutes. Data were collected using a questionnaire and during a direct interview before the educational intervention and three months after the educational intervention. Data analysis using SPSS software version 20 and descriptive tests (frequency and percentage, mean and standard deviation) and analytical tests (paired t-test, independent t-test and Chi-square) at the significance level of 0.05 done. Results: Before educational intervention, there was no significant difference in the mean scores of self-care behavior, perceived sensitivity, perceived barriers, perceived benefits, perceived self-efficacy and perceived social support between the experimental and control groups (P>0.05 ). However, after the educational intervention, a significant difference was observed between the experimental and control groups in terms of the mean scores of self-care behavior, perceived barriers, perceived benefits, perceived self-efficacy and perceived social support (P<0.05). Conclusion: The results of this study showed that education Based on Extended Health Belief Model can be effective on perceived barriers, perceived benefits, perceived self-efficacy, perceived social support, and self-care by increasing and improving the status of structures. Therefore, by designing educational programs based on this model, it is possible to provide the ground for behavior change in target patients.

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