Effect of Feeding rate of crushing product was investigated on product particles size distribution by fractal dimension. particle size distribution was calculated according to the cumulative weight of the particles relative to particles size. A comparison between results obtained by Rosin-Rammler distribution and ones obtained by fractal geometry was made by root mean square error (RMSE). Comminution of ore was performed by three jaw, cone and roll crushers, each fed by rates of 0. 5, 1, 1. 5, 2, 3, 4 and 4. 5 kilogram per minute. Fractal dimension of products for jaw, cone and roll crushers were (from 2. 18 to 2. 32), (from 2. 12 to 2. 27), and (from 2. 30 to 2. 43) respectively. Smallness of fractal dimension by cone crusher is due to particles uniformity. Bigness of fractal dimension of roll crusher is due to limited range of particles granulation. Limitation range of particle granulation causes uniformity of product weight distribution. A 2 mm opening sieve was selected as a passing target sieve. Results show that by increasing Feeding rate, amount of material passing through of target sieve is decreased. The RMSE obtained by fractal geometry for jaw, cone and roll crushers were (between 8. 01 to 8. 60), (between 3. 50 to 4. 17) and (between 0. 83 to 2. 62) respectively. These ones obtained by Rosin-Rammler distribution were (between 8. 11 to 8. 60), (between 4. 50 to 4. 93) and (between 3. 91 to 7. 91) respectively. A comparison of results obtained by these two methods reveals that fractal geometry is a better way to particle size distributions description.

Understanding the flow behaviour in a gas well is crucial for future production strategies, obtaining bottomhole conditions from wellhead production data, analyzing production data and estimating reservoir properties. In this work, the pressure profile and flow regime are studied on four wells of a multi-well, multi-layer gas-condensate reservoir, producing at high rate. The wells are deviated and cased-holes, with the gas flowing through tubing to the wellhead. Here, a comprehensive quality assessment of data is presented. An algorithm is proposed to model wellhead Chokes and determine production rates of individual wells from overall, commingled daily flow rates. The pressure profile and flow regime were determined in each well through back-calculation and nodal analysis. The bottomhole pressure is predicted. The best correlations are selected by comparing the model results with reported production logging tool (PLT) data. The rates of produced condensate and water (equivalent to gas) and their PVT properties, e.g. API of condensate, had little impact on Choke calculations, which is due to high flow rate gas. The flow is shown to be gas-like at the bottom, which turns to mist flow near the wellhead. Liquid holdup is subject to the wellhead pressure and well flow rate. It decreases with an increase in wellhead pressure and gas flow rate. The findings here can be extended to other wells in the same reservoir, which can introduce guidelines for gascondensate well modeling.

Dear Editor; Breast Feeding is an important health-promoting behavior, conferring numerous health benefits for both mothers and infants. Mother’s milk is the most appropriate food for infants. There is no other food to replace it. Breast Feeding is the normal way of supplying necessary nutrients of young infants for their health growth and development.

Objective: The ideal nourishment for newborns with low birth-weight is breast milk. The purpose of the study was to determine the effect of natural-Feeding education given to mothers of low-birth-weight infants, on the mothers’ breast-Feeding self-efficacy level, breast-Feeding success, and the growth of the infants.Methods: The study was conducted in a quasi-experimental way. The study group consisted of a total of 85 low-birth-weight infants and their mothers who had been treated in the neonatal clinics of two hospitals. The mothers included in the test group were given breast-Feeding education for half an hour per day, during the first 5 days of their hospitalization. Home visits were carried out at the homes of the participants from both the test and control groups, until the infants reached 6 months of age. For collecting data, the following forms were used: Personal Information Form, Breast-Feeding Self-Efficacy Form, LATCH Breast-Feeding Assessment Tool, and Anthropometric Measurements Form. For analyzing the collected data, percentage, arithmetic mean, standard deviation, and chi-square we used, and, in independent groups, t-tests were employed.Findings: It was determined that natural-Feeding education given to the mothers increases their breast-Feeding self-efficacy levels and success in breast-Feeding (P<0.05). It was found that in the test group, the rate of Feeding the infants exclusively with breast milk is higher in comparison with the control group (P<0.001).Conclusion: Results of the study indicate that natural-Feeding education increases breast-Feeding self-efficacy levels, breast-Feeding success, and the breast-Feeding duration.