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Considering the colorful role of sports in raising the level of physical and mental fitness of citizens, sports facilities are considered one of the city's most important uses. The present research was carried out to spatially analyse sports venues in Mashhad using the geographic information system. According to the type of research, the research method is descriptive and analytical of the survey type, and according to the research purpose, it is applied research. The statistical population of the present study includes all sports fields, sports complexes and swimming pools in Mashhad city in 13 areas within the service area, and the research sample is equal to the statistical population (in full). First, the Information and Communication Technology Organization prepared geographical information of sports venues and maps related to population parameters. Spatial statistical analysis and the method of preparing cluster maps were used to examine the spatial distribution, and in the next step, the hot spot analysis method was used to examine the most important area. All these steps are under the category of Spatial Statics Tools. Spatial Analyst Tools was used to prepare density maps and depict layers. According to the results obtained, the sports facilities are somewhat distributed in clusters, and in some areas, they are randomly distributed, which indicates the uneven distribution of sports facilities in Mashhad. Sports have no significant dispersion, and the concentration of sports places in Mashhad is also in Regions 10 and nine.
 

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Culture in the discourse of leadership and its role in the realization of the new Islamic civilization is one of the important issues that need a lot of research. Because culture is very important in the view of the Supreme Leader and has a central position. Accordingly, the importance of the place of culture in the thought of his leadership has led him to develop a cultural engineering perspective. From this perspective, cultural engineering is an effort to strengthen the main components of the Islamic and national culture of the country and protect it against the influence and influence of destructive Western culture, in the light of proper arrangement and determining the correct position of all cultural dimensions and characteristics of society. These efforts require the proper design of cultural engineering. This article seeks to answer the question, what is the relationship between the concept of culture and modern Islamic civilization in the discourse of the leadership of the Islamic Revolution of Iran? The methodology of the present research, which has a descriptive- analytical nature, has provided and collected the required data and information through the library method and by accessing sources such as books, articles and research reports. In the form of the theory of modern Islamic civilization, it is based on the hypothesis that according to the Supreme Leader, culture has provided the basis for the formation and expansion of modern Islamic civilization in society.The results of the research have shown that there is a close and significant relationship between modern Islamic culture and civilization. In such a way that culture is effective in the realization of modern Islamic civilization and according to the most important components of Islamic civilization, which is God-centered based on human dignity and cultural and spiritual values, this statement is confirmed.

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Abstract
Meat and meat products are important component of the diet and provide a large part of the proteins, vitamins and mineral requirements of the human body. However, cooking creates harmful and undesirable compounds in them. Among these, polycyclic aromatic hydrocarbons (PAHs) and volatile N-nitrosamines (VNAs) have received more attention due to their high carcinogenic potential. In this study, samples of smoked beef cocktail (55%) were randomly obtained from three reputable companies (20 samples from each brand) from protein supply centers in Kermanshah. Then, the amounts of three types of nitrosamines including N-nitrosodimethylamine (NDMA), N-nitrosopyrrolidine (NPYR) and N-nitrosopiperidine (NPIP) after extraction by dispersive liquid-liquid micro-extraction (DLLME) and two PAHs including benzo[a] pyrene (Bap) and benzo[a] anthracene (Ban) after separation by solid phase extraction method (SPE) were measured in samples cooked via two methods of boiling and deep frying using gas chromatography equipped with flame ionization detector ( GC-FID ). Based on the results, deep frying led to a significant increase in the amount of both nitrosamines and PAHs. However, the content of these compounds in the samples processed by boiling method was not statistically different from the control sample (p >0.05). Different brands also contained different amounts of nitrosamines and PAHs. Therefore, boiling method can be considered as a suitable and safe method for cooking meat and meat products.

 

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The solidification/stabilization of bentonite and heavy metals is among the conventional methods in geo-environmental projects. Among the various methods used for the solidification/stabilization process, cement-based systems are widely used due to their relatively low cost, availability, and environmental compatibility. Cement-based solidification/stabilization technology is an attractive option for managing heavy metal contaminants and facilitating final transportation and containment, thereby reducing contaminant emissions to the environment. The efficiency of solidification/stabilization technology can be improved through certain modifications. The objective of this paper is to determine the effect of substituting calcium carbonate on improving the solidification/stabilization process of bentonite and heavy metals towards reducing cement consumption.
To achieve this goal, samples of bentonite containing 100 cmol/kg-soil concentration of lead nitrate with different compositions of cement and calcium carbonate were solidified/stabilized. To determine the appropriate concentration of added contamination to the soil, a series of tests for heavy metal retention using the soil suspension equilibrium method, based on EPA standards, has been conducted. These tests were performed on bentonite suspensions at heavy metal lead concentrations ranging from 0 to 250 cmol/kg-soil. In EN197 standard, two types of Portland limestone cement are introduced with the names II/A-L and II/B-L, containing 6 to 20 percent and 21 to 35 percent calcium carbonate, respectively (EN197-1, 2000). Based on this, in the present study, up to 25 percent by weight of calcium carbonate is used as a substitute for ordinary Portland cement, and the combination of cement and calcium carbonate as a binder is used. The mechanism of contaminant retention was evaluated through XRD, TCLP, pH, and UCS tests. In this study, the amount of immobility of heavy metals after stabilization and solidification process using the Toxicity Characteristic Leaching Procedure (TCLP) based on EPA-1311 method has been evaluated. In the first stage of the aforementioned experiment, the solidified/stabilized contaminated sample was adjusted to pH 8.2 with a 0.1 molar hydrochloric acid solution and prepared as a suspension with an S:W ratio (solid:water) of 1:20. All suspensions were continuously shaken for 18 hours using a mechanical shaker, and after measuring the pH of the samples and centrifuging them, the liquid phase was separated and the contaminant concentration was measured using a GBC932 AB Plus atomic absorption spectrophotometer. Unconfined compressive strength (UCS) can be used as a criterion for assessing hydration reaction progress. In this study, samples were subjected to curing for 7 and 28 days in a closed system and placed in a humid chamber at 23 degrees Celsius and 95% humidity according to ASTM D1633-17 standard, with a uniform density of 1.85 g/cm³ for testing unconfined compressive strength. Furthermore, X-ray diffraction (XRD) analysis was utilized to investigate the microstructure of the samples and the progress of the cement hydration process and its interaction with contaminated clay minerals.
According to the results of this study, replacing 15% calcium carbonate instead of cement preserves the necessary conditions for the establishment of stabilization and solidification mechanisms. For instance, for a sample containing 1.4% optimum moisture, the desorption amount of lead ions in the TCLP test is equal to 2 milligrams per liter, and the uniaxial resistance of the sample is equal to 1.45 MPa, meeting both EPA standards. In fact, the achieved results indicate that substituting up to 15% calcium carbonate instead of ordinary Portland cement not only reduces cement consumption but also improves the contaminant retention capability in the cementitious solidification process. The reason for the improvement in these conditions is attributed to the simultaneous role of calcium carbonate filling and nucleation alongside the increase in the range of carbonate compound sedimentation.