Background: Cystic Fibrosis ((CF)) is a systemic autosomal disorderandthe most important chronic lung disease in children. Oxalate is the end product of vitamin C metabolism, which increases the risk of kidney stones, urinary bladder stones, and calcium deposits in (CF) patients. Objectives: Considering the increased mineral excretion and the rate of stone FORMATION in the urinary tract, examining the excretion of minerals will greatly help resolve clinical problems. Methods: This descriptive-analytical study was performed on (CF) and healthy children in Gorgan in 2018-19. In this study, 40 (CF) children and 40 healthy children were randomly selected. After obtaining informed consent from the parents of the children, a random urine sample was collected to evaluate urine minerals. Children with abnormal urinary mineral excretion underwent ultrasonography. The data were analyzed by SPSS 18 using descriptive indices (mean SD, frequency, and percentage) and statistical tests (independent t-test, chi-square test, and nonparametric tests). Results: Out of 80 (CF) and healthy children, 34 were girls, and the rest was boys. The mean age of the patients was 4. 34 3. 38. The age difference was not significant between the groups (P > 0. 05). The mean urinary levels of phosphorus, uric acid, magnesium, and citrate were 0. 87 1. 01, 1. 16 0. 68, 0. 23 0. 18, 2. 37 3. 13 mg/mg of creatinine. In the pediatric patient group, respectively (P < 0. 001). The mean urinary calcium level in (CF) patients was 0. 28 0. 39, which was lower than that in the healthy group. The mean urinary oxalate level was 0. 13  0. 20 in (CF) patients, which was higher than that in the healthy group (P > 0. 05). Hyperoxaluria, hyperuricosuria, hypomagnesiuria, and hypocitraturia occurred in 35, 30, 62, and 7. 5% of the (CF) patients, respectively. Among the urinary minerals studied, hyperoxaluria was found to be a major determinant of stone FORMATION risk in (CF). No correlation was observed between the FORMATION of stones and the rate of excretion of minerals (P > 0. 05). Conclusions: In summary, (CF) patients are at an increased risk of developing citrate and calcium stones compared to the healthy group, which is associated with hyperuricosuria, hypocitraturia, and hyperoxaluria.

The purpose of this research is to investigate the factors affecting the FORMATION of leading schools, so that it can be used in Iran's education. For this purpose, first, according to the research background and theoretical foundations, a conceptual framework was presented in the field of the components of an efficient and progressive school. Due to the nature of the subject, this research is an applied and developmental research and its method is of a mixed type, and includes quantitative and qualitative methods. According to the obtained inFORMATION, the statistical population is about 3000 people. The sample size is estimated to be 344 people using Morgan's table. Stratified sampling method was used for sampling in this research, and 84 managers and 260 teachers participated in this study. The tool of this research is a researcher-made questionnaire. To analyze the data and answer the research questions, the correlation coefficient test and factor analysis were used. The results of the research showed that the components of management and leadership, research factors, educational factors, human resources, budget and infrastructure, technology and equipment are the main components of the FORMATION of leading schools, and the component of educational factors has the largest contribution.

In this research, the aim is to achieve strong and ablation-resistant composite parts C / (CF)-ZrB2-ZrC-SiC and C / (CF)-ZrB2-SiC by non-pressure sintering method. C / (CF)-ZrB2-SiC samples were prepared using synthesized ZrB2 and SiC powders between layers of resin-impregnated carbon fabric. After pressing with pressure 5 times at 1600 وC and heat treatment for 2 hours in a controlled atmosphere furnace under Ar atmosphere. In the next step, C / (CF)-ZrB2-ZrC-SiC composite parts were prepared to investigate the effect of ZrC addition and compare it with C / (CF)-ZrB2-SiC samples. This was done by synthesizing ZrB2-ZrC-SiC ceramic powder between layers of carbon fabrics using zircon (ZrSiO4), B4C, activated carbon, with or without Si, along with shredded carbon fibers. For this purpose, the prepared powders after wetting and drying along with resin were sprayed between carbon fabrics and the resulting samples were pressed 5 times by cold pressing after 20 layers. After pressing and finding the raw strength, the samples were transferred to a control atmosphere furnace under Ar atmosphere and subjected to heat treatment for 2 hours at 1600 .C. Scanning electron microscopy (SEM) and X-ray analysis (XRD) were used to investigate the microstructural and fuzzy properties of the samples, and the three-point flexural strength test and oxytocin flame were used to investigate the mechanical properties and oxidation resistance of composites. The linear erosion rates of C / (CF)-ZrB2-SiC and C / (CF)-ZrB2-SiC-ZrC samples in the oxytocin flame abrasion test were 2.16 and 1.74 μm / s, respectively, and the average erosion rates were 3.28. And 2.41 (4-10 g / s *) were measured. Also, the mean density values ​​for C / (CF)-ZrB2-SiC and C / (CF)-ZrB2-SiC-ZrC samples were 4.67 and 05.03 gr / cm3, respectively, and the flexural strength was 303 and 245 MPa, respectively. .