فهرست مطالب f. fotovat

As one of the promising approaches, the thermocatalytic hydrogenation of carbon dioxide to methanol through a heterogeneous catalyst has attracted much attention in the past decades. In industry, methanol is produced from the reaction of syngas (H2+CO) and carbon dioxide over CuO/ZnO/Al2O3 (CZA) catalysts. Co-precipitation of Cu/Zn/Al nitrates by sodium carbonate is the dominant and standard technique used for the industrial synthesis of methanol catalysts. This three-component catalyst is very sensitive to slight changes in metal components and synthesis parameters. In this study, the effect of calcination temperatures (300, 350, and 400°C) and aging time (2, 7, and 18 hours) on the structure and textural properties of CuO/ZnO/Al2O3 catalysts have been investigated using the BET, XRD, H2-TPR, and FE-SEM analyses. The results show that the most appropriate catalyst could be synthesized when the calcination temperature and the aging period were set to 350°C and 7 hours, respectively.

The aim of this study is to investigate different style of emotional expressiveness, affective empathy, material satisfaction by the mediation of attachment styles of the mothers of children with ADHD. The research method was descriptive and correlational. The sample includes the total numbers of mothers of children with ADHD in Tehran who referred to one of the counseling centers, specialized clinics, counseling centers of municipal association and counseling centers of Tehran and Shahid Beheshti Universities in the fall and winter of 2016-2017. 150 people were selected as subjects by availability method.The research tool was emotional expressiveness questionnaire (EEQ), Davis empathy questionnaire, Enrich marital satisfaction scale, 15-item scale of Hazen & Shaver to evaluate the attachment style. Tables, charts, frequency, mean and percentages were used in the descriptive method and Pearson correlation coefficient and variance analysis were used for inferential statistics. The result of the study suggested that there is a (correlational) relationship between different styles of emotional expressiveness and attachment styles, between different styles of emotional expressiveness and affective empathy, and between different styles of emotional expressiveness and marital satisfaction of the mothers of children with ADHD, consequently, hypotheses of the present research were confirmed.