h. asgari

Wheat is considered the most important grain and one of the vital food products in Iran. After nitrogen, phosphorus is the most important nutrient required by plants and holds a high priority for the growth, yield and quality of plants. However, due to the introduction of phosphorus in various reactions in the soil, a small amount of consumed phosphorus fertilizer is removed by the plant and the rest of it is left in a non-absorbable form in the soil. The efficiency of using phosphorus fertilizers and the availability of this nutrient is considered as a limiting factor for the production of agricultural products in calcareous soils with alkaline reaction of Iran. Since graphene and its oxidized form, with large amounts of active oxygen groups and high specific surface area, have been proposed by many studies as non-toxic and biocompatible materials in the production of compounds with improved efficiency of using nutrient, therefore to increase the efficiency of phosphorus consumption in soil, in this study, phosphorus was loaded on graphene oxide (GO-P). The present study aims to assess the influence of this compound as a source of phosphorus and its mixing with triple superphosphate fertilizer (GO-P-TSP) compared to triple superphosphate soluble fertilizer (TSP) on the amount of water retention of fertilizers in soil and phosphorus concentration in aerial parts of wheat plant.

Methods and Materials:

Graphene oxide was prepared based on the modified Hamers method. Then graphene oxide was adjusted to certain pH and iron sulfate as a source of iron ions was added to the graphene oxide suspension with vigorous stirring. The mixture was stirred for one hour and then centrifuged for 30 minutes. Then the supernatant was removed and the residue of the compound was dry frozen. In the next step, pH was adjusted with sodium hydroxide (NaOH) solution. Then a certain weight of potassium dihydrogen phosphate salt (KH2PO4) was added to the above suspension. The mixture was stirred for one hour and centrifuged for 30 minutes. After centrifugation, the supernatant was removed and the remains of the phosphorus composition based on graphene oxide were dry frozen. Loading tests were performed in three replicates. pH, EC, bulk density, total concentration of phosphorus and iron and X-ray diffraction spectroscopy (EDS) analysis were measured in the sample of phosphorus composition based on graphene oxide. Then three fertilizer formulations were selected, which included (1) triple superphosphate fertilizer, (2) synthesized phosphorus fertilizer based on graphene oxide, and (3) mixing graphene oxide-phosphorus compound with triple superphosphate fertilizer in a ratio of 50:50% phosphorus.To investigate the water retention behavior of fertilizers in the soil, dried samples of the three studied fertilizer formulations was added into a sandy soil completely and weighed. At the same time, dried sandy soil without fertilizer was placed in another beaker as a control.Then each beaker was added distilled water and weighed. The beakers were weighed once every three days at room temperature until they reached constant mass. The water-retention behavior of the soil was calculated.In order to investigate the effect of three fertilizer formulations on phosphorus availability, soil with low amount of phosphorus was selected and physical and chemical properties of the soil sample were measured at a depth of 0-30 cm. A greenhouse experiment on wheat planting was conducted using a randomized complete design with 3 replications. The treatments included three fertilizer formulations at three fertilization levels (10, 15, and 20 mg kg-1) with 3 replications. The control treatment was performed without phosphorus fertilizer. Plants were harvested 72 days after planting, washed with distilled water and dry with tissue paper. The samples were air-dried and then oven dried at 70˚C to a constant weight in a forced air-driven oven. After harvesting, the weight of fresh and dry matter and phosphorus concentration in the soil and aerial parts of the plant were measured. Statistical data were analysed using SAS software (9.4) and the mean values were compared using LSD tests (at 1 and 5% level).

The composition of phosphorus based on graphene oxide (GO-P) in powder form had 35.5% of total P2O5, 31.1% of soluble in water P2O5, 19.6 of total iron and 15.28% of total potassium. The result of EDS analysis confirmed the loading of phosphorus on graphene oxide. The pH of the phosphorus composition based on graphene oxide was 5.8, approximately 2.5 units higher than triple superphosphate fertilizer. The bulk density of the compound (GO-P) was significantly lower than triple superphosphate fertilizer. The EC of the compound (GO-P) was similar to the EC of the triple superphosphate fertilizer. Soil water retention with synthesized phosphorus fertilizer based on graphene oxide (GO-P) was higher than soil (control) and other compounds added to soil. Experimental results showed that the addition of prepared fertilizer formulas (GO-P and GO-P-TSP) increased water retention in the soil for a longer period of time, while in the soil without adding fertilizer and triple superphosphate treatment, respectively, from 10 and 11 days, the absorbed water completely evaporated. Therefore, the combination of soil with GO-P and GO-P-TSP compared to the soil without fertilizer and the combination of soil with triple super phosphate (TSP) fertilizer had better water retention behavior. The greenhouse experiment results of wheat planting showed that all treatments were significant (P<0.01). Among all the treatments and measured levels, the control treatment showed the lowest value. The highest concentration of phosphorus in aerial parts of wheat (0.31%) and in soil after harvesting (9.5 mg kg-1), fresh (10.6 g per pot) and dry weight (2.03 g per pot) of aerial wheat plants were related to the treatment of phosphorus compounds based on graphene oxide at the level of 20 mg kg-1.

The highest concentration of phosphorus in aerial parts of wheat was related to the treatment of phosphorus compound based on graphene oxide at the level of 20 mg kg-1. Therefore, with more research in the future to produce "nutritious plants" in sustainable, efficient and flexible agricultural systems, we can benefit from technologies based on carbon materials.

Acceptable seismic performance, ease and low cost in design and implementation are advantages of passive dampers, but fixed performance parameters corresponding to the type and amount of input energy reduce their efficiency. In this research, a new two-level passive damper in rigid connections with variable stiffness, strength, and energy absorption capacity is introduced and its seismic performance in 5, 10, and 15-story steel frames is evaluated with nonlinear dynamic analysis using SAP2000 software. The results show that, despite the different dynamic parameters in the selected seismic records, such as the frequency content and duration of ground motions, the performance of the structures under all earthquakes has improved significantly, which confirms the effectiveness of the proposed damper in rigid connections on improving the seismic performance structures. Besides, results prove the proposed damper effectiveness on decreasing the structural response such as maximum displacement and base shear. The average displacements reduced by 61%, 51% and 16% compared to those of BSEEP-4ES connections for the 5, 10 and 15-story frames, respectively. Besides, maximum base shear forces reduced by average of 29% and 15% compared to those of BSEEP-4ES connections for the 5 and 10-story frames, respectively.

Denitrification bioreactors for nitrate removal from agricultural water effluents have improved in recent years due to their low cost and ease of use. Scientific results and local experience are required for the optimal use of bioreactors. This study aimed to study nitrate removal efficiency and the effectiveness of each of these factors. Thus, 27 pilot bioreactors had the same volume and depth with different cross-sections in a randomized statistical design. Three geometric shapes of the trapezoid, rectangle, and triangle for the cross-section bioreactors and three organic matters including wood chips, corn stem chips, and wheat straw in 3 replications were used. Nitrate concentration at the inlet of the reactor and their outlet was measured at hydraulic retention times of 3, 6, 12, 16, and 24 hours. According to the average nitrate removal from the effluent, wood chips, wheat straw, and corn stem chips with 31.3, 28.6, and 27%, respectively, were prioritized during the 24-hour hydraulic retention time. Therefore, wood chips are the most suitable organic matter for nitrate removal from drainage water in actual biological reactors compared to other organic materials used in this study. The results demonstrated nitrate removal the 25.6, 30.1, and 35.3% for triangular, rectangular, and trapezoidal geometric shapes, respectively, for wood chips organic matters. Also, reactors with trapezoidal cross-sections have higher efficiency. In sum, this study showed that where there is a limit to the supply of wood chips, wheat straw and corn stalk chips can be used in bioreactors to remove nitrate.

Based on the theories of traditional medicine, body temperament can determine physical, mental and emotional characteristics. The purpose of the present study was to survey and compare temperaments in elite, amateur and inactive runners.

In this descriptive survey statistical society consisted of all elite and amateur runners of the Fars Track and Field Commission. Forty runners (20 elite and 20 amateurs) were selected randomly as the sample. Twenty other inactive people were selected for comparison. Data were collected using a self-administered questionnaire. The statistical hypothesis testing methods were used.

The findings of the study indicate that there is a significant relationship between temperament and physical activity level (p<0.05). There was also a direct relationship between the Choleric and Sanguine temperaments and level of physical activity in all three groups of elite and amateur runners and inactive people. There is no significant relationship between Melancholic and Phlegmatic temperaments and physical activity level (P>0.05).

According to the present study, it can be concluded that hot temperament of runners can be an important factor in increasing their participation in physical activity.

Annual a large number of people lose their lives in the accident. In this paper, use death statistics of road accidents between the years 2009 - 2013 to compare the accuracy of forecasting methods Holt Winters multiplicative and cumulative, time series ARIMA, exponential adjusted and intelligent method of artificial neural network has been studied. Criteria for selecting the best forecasting method and the average percentage error have been selected. The results showed that ARIMA time series model more accurately forecast the death rate caused to accidents. . The forecasted values for the years 2014 and 2015 and 2016 show that the number of death caused accidents in the country with gentle slopes on the decline which can be taught and proper management of this number decreased by more slope