The present study was conducted with the aim of investigating the effect of brainstorming teaching method on reducing reading learning disorder in elementary school students of Hamadan city. The present study was a cross-sectional study in terms of practical purpose, a More
The present study was conducted with the aim of investigating the effect of brainstorming teaching method on reducing reading learning disorder in elementary school students of Hamadan city. The present study was a cross-sectional study in terms of practical purpose, a cross-sectional study in terms of time, a quantitative data type, and a semi-experimental one in terms of research method, with a pre-test-post-test design with a control group. The statistical population of the study consisted of all the students with learning disabilities of the reading type, in the primary level, who had referred to the learning disabilities center in Hamedan city in the academic year of 2001-2001. From the aforementioned statistical population, 30 people were selected by available sampling method and were randomly divided into two experimental and control groups, then the experimental group underwent 8 training sessions (two sessions in one week) for 45 minutes. brainstorming training, but the intervention was not implemented for the control group. Then, both groups were given a post-test using the mentioned questionnaire. The research tools include the brainstorming program based on Le Francois (1991) brainstorming protocol and Shirazi and Nilipour's reading disorder test (2013), in order to analyze the data and examine research hypotheses from multivariate and univariate covariance analysis. used. The results showed that the effects of brainstorming teaching on reading comprehension are significant and the effects of brainstorming teaching do not affect reading speed and reading accuracy. The brainstorming teaching method could not create a significant difference between the experimental and control groups in the components of reading speed and correctness of the material.
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In this paper, cobalt ferrite nanoparticles were synthesized using a co-precipitation method. The properties and characteristics of the cobalt ferrite nanoparticles were studied using XRD, VSM, and FESEM analyses. The FESEM images showed that the cobalt ferrite nanopart More
In this paper, cobalt ferrite nanoparticles were synthesized using a co-precipitation method. The properties and characteristics of the cobalt ferrite nanoparticles were studied using XRD, VSM, and FESEM analyses. The FESEM images showed that the cobalt ferrite nanoparticles had almost spherical morphology, and that the particle size distribution (determined with the help of Digimizer software) was in the range of 25–60 nm. Moreover, the average size of the nanoparticles was calculated to be in the range of 37-47 nm. The VSM results indicated superparamagnetic properties of the cobalt ferrite nanoparticles at room temperature. Besides, the saturation magnetization and coercivity were found to be 30 emu/g and 39 Oe, respectively. The specific loss power (SLP) was investigated by preparing ferrofluid concentrations of 3, 5, and 8 mg/ml under a magnetic field of 400 Oe and at a frequency of 400 kHz. In this case, the rate of the increase in temperature of the cobalt ferrite nanoparticles was measured in a certain period of time, and the related SLP was calculated. The results of the measurements showed that the highest rate of the heat generation occured at the concentration of 8 mg/ml, leading to an SLP value of 162 W/g.
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In this study cadmium doped nickel copper ferrite Ni0.5Cu0.5Fe2O4 (cd doped) nanoparticles with spinel structure were synthesized using co-precipitation method. The nanoparticles were employed as a gas sensing material. X-ray diffraction (XRD), X-ray fluorescence (XRF) More
In this study cadmium doped nickel copper ferrite Ni0.5Cu0.5Fe2O4 (cd doped) nanoparticles with spinel structure were synthesized using co-precipitation method. The nanoparticles were employed as a gas sensing material. X-ray diffraction (XRD), X-ray fluorescence (XRF) and transmission electron microscopy (TEM) techniques were used to characterize the nanoparticles structure. The sensing behavior of the nanoparticles was examined in the presence of different gases including. Acetone, acetonitrile, acrylonitrile, formamide, caron tetrachloride, vinyl acetate, ethanol, ammonia, and methanol. The characterization process was performed for a concentration of a 200 ppm and within a temperature interval from 50 ˚C to 300 ˚C and the best sensing behavior was found to be at 200 ˚C. Furthermore, various concentrations of acetonitrile gas at 200 ˚C within a concentration interval of 20 to 200 ppm were tested and it is found that the higher concentrations will result in a better response.
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