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A Quantitative Structure-Property Relationship (QSPR) study based on artificial neural network (ANN) was carried out for the prediction of the gas-to-wet butyl acetate partition coefficient of a set of 81 organic compounds of very different chemical nature. The genetic algorithm-partial least squares (GA-PLS) method was applied as a variable selection tool. A PLS method was used to select the best descriptors and the selected descriptors were used as input neurons in neural network model. These descriptors are: Randic index (order 2) ( 2 v), atomic charge weighted partial positively charged surface area (PPSA-3), difference between atomic charge weighted partial positive and negative surface areas (DPSA-3), minimum net atomic charge for a O atom (q min O) and hydrogen bonding donor ability of the molecule (HDSA1). The results obtained showed the ability of developed ANN for prediction of the gas-to-wet butyl acetate partition coefficients of various compounds. Also result reveals the superiority of the ANN over the PLS model.

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Background and Objective: One of the major stressors for families, especially women, is a recurrent pregnancy loss that exposes them to many psychological problems. This research aimed to investigate the effectiveness of positivism training on rumination, body image and sexual satisfaction in women with recurrent pregnancy loss. Methods: This was a semi-experimental research with a pre-test and post-test design and an experimental and control group. Research population was women with recurrent pregnancy loss referring to Imam Khomeini (Rah) and Razi hospitals in Ahvaz city in spring of 2018. Sample research was 40 people that were selected by available sampling method and assigned into two equal groups. The experimental group was trained for 8 sessions of 90 minutes with positivism method and the control group didn't receive any training. The groups completed the questionnaires of rumination, body image and sexual satisfaction in the pretest and post-test stages. Data was analyzed by multivariate analysis of covariance method using SPSS 19. Results: The findings showed that there was a significant difference between the experimental and control groups in terms of rumination, body image and sexual satisfaction. In the other words, positivism training led to a decrease in rumination and positive body image and sexual satisfaction in women with recurrent pregnancy loss (P<0/001). Conclusion: The results indicated the effect of positivism training in improving rumination, body image and sexual satisfaction in women with recurrent pregnancy loss. Therefore, counselors and therapists can use positivism training to intervention in the field of rumination, body image and sexual satisfaction.

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