فهرست مطالب f. imani

The reprocessing tailings of iron ore processing plants is important from economic (as a secondary source of iron) and environmental points of view. The aim of the present study is to determine the appropriate method for recovery iron from the tailings of Balestan iron ore processing plant (located in the northwest of Iran). For this purpose, after taking samples from the tail piles of this plant, a representative sample was selected, and chemical, mineralogical, size distribution, and bond’s work index analyses were performed on it. The total iron grade in the tailings was measured to be about 10%, of which 8.5% was identified as magnetite mineral (with a degree of liberation less than 40%). The d80 value of the sample was 7 mm, and the bond index was measured as 11.84 (kWh/ton). To determine the appropriate method for iron recovery, pre-processing with magnetic drum, grinding, and Davis tube tests were performed. With the magnetic pre-processing of tailings with a particle size of 0-10 mm, under a field of 2000 G and in a dry method, about 80% of the load entering the drum with a total iron grade of 5% was transferred to the tailings. 20% of the input load with an iron grade of approximately 24% was recovered to the concentrate. In order to remove the gangue minerals and enrich the pre-processed concentrate, stepwise grinding and separation had the best results. Comminution was done in two stages to produce products with smaller dimensions of 250 and 45 microns, respectively. Magnetic separation was also done in three stages with 3000 G, and two stages of separation with 1000 G, which finally resulted in a concentrate with a total iron grade of more than 66% and iron recovery of 44.88%.

The purpose of this study was to determine the effectiveness of Arch Support insole on vertical GRF variables and time to peak compared to healthy group among handball players with pronated foot during jump and landing three-step shot technique.

The current research was semi-experimental pretest-posttest design. The sample consisted of 20 male handball players with pronated foot.  Participants were purposefully assigned into one of two groups: pronated foot and healthy group.The arch support insole used in this study had a bulge on the medial longitudinal arch part. Bartek's force plate device was used to measure the ground reaction force components during the three step jump. Statistical analysis of variance with repeated measurement was used at a significant level of p≤0.05.

The results showed that there was a significant decrease in the anterior-posterior (p=0.004) and vertical (p>0.001) components of the ground reaction force in the pronated foot group during jumping in the post-test phase compared to the pre-test. There was a significant reduce in the time to pick the vertical component of the ground reaction force in the pronated foot group in the post-test compared to the pre-test (p<0.001). Also, There was a significant reduce in the medio-lateral (p=0.001) and vertical (p>0.001) components of the ground reaction force in the pronated foot group in the post-test compared to the pre-test at the moment of landing. In addition, there was a significant increase in the time to pick the vertical component of the ground reaction force in the pronated foot group in the post-test compared to the pre-test (P=0.001).

According to the results of the research, it can be concluded that the use of arch support insoles might lead to reduce ground reaction forces and increase time to pick the components of the ground reaction force during landing and increase ground reaction forces and time to pick during jumping in handball players with pronated foot, that can lead to reduce injuries and better performance.

The aim of the present study was to investigate the effect of immediate and long-term water and Thera-Band exercises on the ground reaction force in people with pronate foot during walking.

The current research was semi-experimental with a repeated measurement design with a control group. The statistical sample of the present study included 45 male students of Mohaghegh Ardabili University with pronate, with an age range of 18-25 years, who voluntarily and purposefully participated in this study. Subjects were randomly assigned to three groups of exercises in water, exercise with Thera band and control. Walking speed and peak components of ground reaction force were investigated in three pre-test stages, immediately and after 8 weeks of training in water and traband. Bartek force plate with a sampling rate of 1000 Hz was used to record the ground reaction force during walking. Also, analysis of variance with repeated measurements and Bonferroni post hoc test were used to analyze the data at a significance level of p ≤ 0.05.

The results showed that walking speed increased significantly after 8 weeks of training with theraband (p=0.032) and training in water (p=0.025) compared to the pre-test. The vertical component of the ground reaction force in the heel strike phase after 8 weeks of training in water (P=0.002) and theraband (P=0.032) had a significant decrease compared to the pre-test.  Moreover, the vertical component of the ground reaction force in the push-off phase after 8 weeks of training with theraband had a significant increase compared to the pre-test (P=0.015). In addition, the anterior-posterior component of ground reaction force increased significantly in the push-off phase after 8 weeks of water training compared to the pre-test (P=0.001).

According to the results of the research, it can be concluded that the exercises in the water and the traband have long-term clinical and therapeutic effects on people with pronate and can be useful for correcting the walking pattern.

One of the effective educational factors in the new education is the architecture of the educational spaces. In the new education, the physical space of the school is not only a strict and soulless environment in the learning process, but also plays a role as a living and dynamic factor in the quality of students' educational activities. In learning environments, paying attention to design features is not only in order to improve the quality of the environment but also as a tool to increase the impact of the environment on behavioral characteristics. In some recent research, the physical environment is referred to as the "hidden subject in the curriculum." In this interpretation, the meaning of "hidden subject" is anything that, in addition to the common curriculum, by emotionally organizing the educational space, affects the adolescent emotionally and psychologically. This is "hidden" because it does not necessarily have objective and tangible effects or is often overlooked by everyone. Life stresses play a crucial role in mental and physical health and are especially associated with various psychological and social harms. Identifying student stress is the basic basis for designing and developing various preventive programs. In the meantime, school is a special place as a place where teenagers spend a lot of time and should play a role in reducing students' stress with proper design. Stress is a special relationship between a person and the environment in which the person evaluates the environment beyond his or her resources or threatens his or her health. Various factors play a role in stress. One of these factors is environmental factors. The current study has been done with the aim of investigating the effect of natural daylight on students’ stress reduction in the classroom.

This research is a correlational study and in terms of purpose is an applied research. The research method is survey and the data collection instrument includes the standard questionnaire for measuring stress, anxiety, and depression (DASS-21). The reliability of the questionnaire was approved with the Cronbach’s alpha of 0.897. The questionnaires were analyzed by SPSS software version 22.

Hypothesis testing was done by t-statistic, Pearson correlation coefficient, and regression. The Levin test was also used to verify the research hypotheses. The results of this study indicate that there is a relationship between daylight and stress, anxiety, and depression with correlation coefficients of 0.634, 0.742, and 0.698 have been found respectively (p < 0.01)

The results of this study indicate that in environments with unfavorable light, the rate of depression, anxiety and stress is higher than in environments with favorable light. In general, it can be said that due to the effect of daylight in reducing stress, anxiety and depression of students and their better performance, the importance of paying attention to the effects that school design has on building users becomes more clear. Architects have a major role in designing educational spaces and with proper design and tailored to the physical and mental needs of students can improve the level of education in society. In order to properly use daylight in educational spaces, the following should be considered: height of windows (with increasing window height, depth and amount of daylight increases), type of canopy (indoor, outdoor canopy or direct beam control) and the properties of glass are effective factors in the amount of daylight that must be designed correctly. Also, in addition to the right amount of light and natural light, direct sunlight should be controlled so as not to dazzle the eyes and disturb the thermal balance of the spaces.

This study aimed to compare clinical personality patterns using Millon’s Clinical Multiaxial Inventory (MCMI-III) in two groups of women with and without chronic pain. To this end، 202 participants including 119 women with chronic pain and 82 women without chronic pain were selected through simple random sampling. The first group، at first، answered pain medical evaluation questionnaire in an attempt to diagnose the type، intensity، and process of pain. Both groups، then، filled out Millon’ Clinical Multiaxial Inventory. Data was analyzed utilizing one-way ANOVA. The results showed that there was a significant difference among sub-groups with diverse types of chronic pain and between the two main groups of the study in respect to subscales of the clinical patterns.