m. karimzadeh

The separation of biological particles is a key step in many fields of biological research, including biotechnology, biomedicine, food, and pharmaceutical industries. Isolation of pathogenic bacteria from food, white blood cells from blood, isolation of circulating tumor cells in the early stages of cancer, etc. are examples of the application of isolation. Among the conventional methods of particle separation, we can mention adhesion, filtering, centrifugation, separation using active fluorescence and active magnetism, etc. While conventional separation methods exploit specific particle properties to achieve high-efficiency separations, with the advent of various microfluidics, less efficient methods have been devised that exploit natural principles and use different particle properties, with very high-volume evaluations. Fewer samples improved the speed and accuracy of separation. In general, passive separation methods are based on the use of several "intrinsic" particles and microfluidics, while active separation methods work by applying "external" forces (such as magnetic fields, electric fields, etc.). Among the most important properties of particles are size, density, deformation, and shape, as well as electrical, magnetic, and acoustic properties. The purpose of this article is to review the principles and common applications.

Reservoir dams have had problems despite all the benefits for humans. one of the most important issues is exposing a large amount of water in contact with the air causing a large amount of water to evaporate. Using chemical methods including heavy alcohols is one of the evaporation suppression methods. In this study, three emulsions of octadecanol, hexadecanol, and a combination of octadecanol, and hexadecanol along with Brij-35 and two physical methods of the canopy and floating balls were used to evaluate the performance of different emulsions. A one-way analysis of variance was applied to compare the mean of evaporation in different chemical and physical methods and a two-way analysis of variance was performed to investigate the main and interaction effects of different meteorological parameters on the value of evaporation. The mean comparison of the evaporation in different methods showed that the two physical methods of the canopy and floating balls had better performance than the chemical methods, and the octadecanol was more efficient than the two other chemical methods. The results of one-way ANOVA showed that among the chemical methods, the octadecanol had no significant difference with floating balls at a 99% probability level (P <0.01). Two-way ANOVA indicated that air temperature and relative humidity had the greatest effect on evaporation. Examination of the effect of different levels of meteorological parameters on the performance of evaporation reduction methods showed that at low temperatures, octadecanol had poor performance than the two physical methods but with increasing temperature, its performance improved. In addition, this monolayer had a suitable performance at low wind speeds compared to physical methods. By increasing wind speed, its performance is severely affected and its efficiency decreases. So, at temperatures above 37° C, an increase in wind speed from 3.5 m/s to above 8.7 m/s has increased evaporation by more than 50%. The effects of monolayers and other evaporation suppression methods on the quality characteristics of the water including dissolved oxygen are significant and should be investigated in future research.

Characteristics of most soils in arid and semi-arid regions affected by carbonates. The study aimed to determine the distribution of carbonates in the size components of some soils in Khuzestan province. Upward to the bottom of Karun, Karkheh, and Jarahi rivers were studied at depths of 0-50, 50-100, and 150-100 cm. The results showed that the average amount of carbonates in the soils of the Jarahi river basin (37%) was significantly different from the amount in the soils of the other two rivers (33%). Carbonates were observed in all soil size components but the maximum was present in the clay component. The highest regression relationship between soil particles was in the clay component (0.375). The highest percentage of particle reduction after carbonate removal was related to coarse silt particles (0.75). Therefore, the soil texture changed from clay in Jarahi, from clay and silty clay in Karun, and silty clay in Karkheh due to the removal of carbonates to sandy loam. There was no significant difference in the distribution of carbonates at different depths for river soils and all studied soils. The relatively uniform distribution of carbonates in the four components studied in these soils from the surface to the depth showed that the carbonates originated from the parent material, namely alluvial flood sediments of these rivers.

Education sector and its indicators as one of the most important components of the social dimension of sustainable development, by playing its fundamental and crucial role in the process of comprehensive development, has a very important and key role and it is prerequisite for achieving the development of communities. Education has always been a concern of governments in achieving a fair distribution of facilities and expertise and has therefore been one of the most important public policies. Public education improves the productivity of low-income and poor people; because it improves their position in the labor market, and as a result, through education, income and welfare gaps can be reduced, and these gaps in turn affect the degree of development of the countries. Therefore, the issue of inequality is a major development challenge in many countries, especially for those countries whose sovereignty includes vast geographical areas. These inequalities make a serious threat to the balanced development of the regions and make it difficult to achieve the national unity. The present study aimed to investigate the development level of Sistan and Baluchistan counties in educational facilities and services according to student’s population.

The research method of this study is descriptive - analytical. The statistical population of the research is the counties of the province in 2016. The statistical sample of the study is 19 counties of the province. The required data for this study was obtained from the province's 2015 statistical yearbook. In the present study, 23 effective indicators in the education sector were used to obtain a logical answer to the main research questions. In this way, in order to analyze the data, at first, the Shannon entropy technique was used to weigh the indicators and then, based on TOPSIS technique with the help of TOPSIS Solver and Excel software, the extent of development of counties in terms of their access to educational facilities were analyzed and determined.

The results of the research show that according to the TOPSIS method, the county of Zahedan is the most developed county and Dalgan is the most deprived county in the province. Based on this index, and according to the educational facilities, the counties of Zahedan, Hamoon, Konarak, Zabol and Sarbaz are the most developed counties in the province; and Dalgan, Qasr-e Qand, Mehrestan and Fanoj are the most deprived counties, respectively.

Research findings show that 84.21% of the province counties are at relatively deprived and deprived level of development and none of the counties of the province are at a developed or relatively developed level. The findings of this study indicate the inadequate distribution of educational facilities and services in Sistan and Baluchestan province. Unfair concentration and distribution of educational resources and facilities in different regions of the province will aggravate the underdevelopment of counties and their further backwardness. Therefore, considering the abundant deprivation of the counties of this province in the field of educational indicators, it is necessary for provincial and national officials to make more serious efforts at the national and provincial levels to eliminate these inequalities and under-development of educational development in this vast province. 

Throughout the year, a huge volume of the surface running water as well as sewage flow down into the plantations of the south of Tehran which can have detrimental hygienic and environmental impacts. In this study, people’s views and their willingness to pay for participation in reduction of water pollution in the south of Tehran are investigated by use of Contingent Valuation Method (CVM). The results show that the residents of Tehran incline to pay 860 milliard Rials annually for the sewage filtration, the management of its use, and consequently the decrease in hygienic and environmental damages. According to these results, the most important characteristic of the products irrigated with treated sewage is their hygiene and healthiness. The results showed that, based on the priorities of the citizens, treated sewage in the first stage should be used in irrigating the green spaces then in indirect edible products such as forage and wheat and at a later stages it can also be used as a source of drinking water for animals and irrigating crops such as tomatoes and leafy vegetables.