JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
Year:2021 | Volume:22 | Issue:12 (103)|Papers Count:19

Background and Objective: Considering the importance of environmental issues in public policies of the country and considering the numerous problems in the field of environment, the purpose of this study was to evaluate and fit the proposed model for formulation of public environmental policies in the country. Method: This research is a descriptive and analytical study which was carried out to determine the validity and reliability of the model by designing the basic conceptual model and determining three basic dimensions (structural, content and context) and thirty sub-components. The initial model of the research was investigated and tested using SEM using Smart PLS 2 software. The model was then fitted at three levels: the fitting of the measurement model, the fitting of the structural model, and the general fitting of the model (GOF). Findings: The t-values for all questions were greater than 1. 96 and the significance of the relationships was determined. On the other hand, convergent validity (AVE) model and divergent validity were confirmed with (0. 91 and 0. 8368, respectively). Also, a value of R2 (0. 91) indicates the validation of the model using the above criterion and demonstrates the high power of predicting endogenous variables. Discussion and Conclusion: "Structural dimension" (path coefficient= 0. 5227) has the highest effect on the public environmental policy network of the country and then "Contextual/Environmental dimension" (with path coefficient= 0. 4597) and then "dimension" Content/Behavior (path coefficient= 0. 0397) is in third place. Also, the GOF criterion was found to be equal to 0. 55235, indicating a strong fit to the overall model.

Sovereignty over natural resources as one of the fundamental principles of international public law has been repeatedly recognized in the resolutions of the General Assembly and other organs of the United Nations since the 1950s, especially in Para 1 under Article 2 of the Charter of Economic Rights and Duties of the Nations. The principle is mentioned precisely as "the full permanent sovereignty [of a state] including possession, use and disposal, over all its wealth, natural resources and economic activities", and expresses the issue of the sovereignty of states over their natural resources, so that they have a direct impact on decision-making and economic measures adopted by the states and in relation to other states, to the effect that no other state has priority over the host state with regard to exercising this right. Adopting Resolution 1803 in 1962, the United Nations General Assembly recognized the permanent sovereignty of States over their natural resources to be subject only to compensation. However, as to the compensation, it adopted a moderate solution which was almost close to the views of the capital exporting states. This resolution establishes the appropriate compensation criterion as the prevailing norm of international law. Therefore, the evolution of the notion of sovereignty over natural resources and the exercise of this right by states, which was deemed illegitimate at the beginning of the twentieth century, was ultimately recognized as legitimate but subject to some restrictions.

Background and Objective: Uncontrolled urban expansion in country cause to increasing of waste production in the cities and became to an important issue despite the progress of science and technology. The purpose of this study is to investigate and select a suitable location for landfill in Malekan city. Method: In this study, the required criteria including lithology, land use, vegetation, soil characteristics, topography (slope), distances from urban areas and away from the main road, the main and secondary canals, residential areas, wells and aqueducts, faults have been identified and collected. To form a pair wise comparison matrix and the weight of information layers determined by using of the Expert Choice 11 software and analytic hierarchy process. Then the appropriate zones have been modeled by overlaying of different layers in GIS media. Findings: It was found that the current waste disposal site of Malekan city does not have sufficient conditions for waste disposal and in order to select a suitable location, in addition to addressing the impact of the included criteria, it is necessary to use field visits and environmental assessments to finally select the most suitable place for landfilling. Discussion and Conclusion: As a result, 8 zones have been selected that 4 of them were eliminated based on field visits. Finally in order to planning of the studied area waste, the candidate zones were evaluated by the Leopold matrix and finally the zone number 4 located on the east of Qalejogh village has been selected as a best location for landfill of Malekan urban waste.

Background and Objective: CO2 concentration, as the main greenhouse gas, is growing in atmosphere and many alternatives have been investigated to deal with it. However, harnessing with the aim of biomethanation seems to be more economic. Method: In this study a mass transfer modeling was conducted for a biomethanation process under a batch strategy aiming at maximizing liquid active volume. The accuracy of modeling results was assessed via comparing with experimental data and kinetic results under zero-dimension study. Then one-dimensional study was conducted in order to investigate biomass and hydrogen concentration profiles within liquid phase of the bioreactor and active volume calculation. Response surface method (RSM) was also served to investigate effect of temperature, pressure and as three main factors on active volume followed by response optimization. Findings: Model accuracy was confirmed by zero-dimension study. One-dimensional study was also revealed that biomass growth dispersion within liquid phase depends on hydrogen profile concentration on condition that both hydrogen and biomass diffusion coefficients were assumed to be equal. Their degree of magnification was 10-9 in standard conditions. RSM showed that the three studied factors significantly affected on bioreactor active volume. Meanwhile, pressure and temperature influenced the most, respectively. Discussion and Conclusion: A batch bioreactor with and high pressure and temperature met optimal conditions for biomethanation; however, process economy defines operational limitations.

Background and Objective: Limited fossil energy source and increase of energy demand is always pushed man to search for new energy sources as replacement. In this case the winds always have a special place in the new generation of energy sources. Semnan province with favourable topographical and relativity suitable situation is one of the best places for building a wind farm. Method: Therefore, in this research different criteria and sub criteria have been used to identify the suitable location for building wind farms in Semnan province, As the importance of information fusion, Analytic Hierarchy Process (AHP) method were employed for weighting the layers and the Expert Choice software implemented for this purpose. The Arc GIS program has been used for special analyses and overlapping of layers. After the analysis of information, according to the capacity of building wind farms, province of Semnan has been divided to four parts of great, good, normal and weak. Findings: At last, it is indicated that Geographic Information System as a Supportive Decision making system can be practical both in preparing of data and designing the priorities and giving expert's ideas dealing with different factors and also help the designers to select the proper location for the wind farms. Discussion and Conclusion: In this research, three regions have been determined, considering priority of overlaying and limitation of land and places, survey of priority area also considering the climate condition and personal observation have been determined that this places are Damghan, Nothwestern of Garmsar and and some part of eastern Shahroud.

Background and Objective: The purpose of this study is to identify and investigate the synoptic systems that led to the extensive and destructive flood events in the west and southwest of the country on March 31 and April 1, 2019. Method: In order to study the synoptic conditions in coincided with the event of heavy rainfall leading to the floods, in addition to using NOAA18 satellite images, sea level pressure data, sea level specific humidity, geopotential height and omega at pressure level 850, 700 and 500 hPa, Relative humidity pressure at 700 hPa, U and V component from pressure 1000 to 200 hPa with a resolution of 2. 5 ° to 2. 5° latitude from the National Center for Environmental Prediction and the National Center for Atmospheric Research (NCEP / NCAR) Received and the maps were plotted. Findings: Existence of a deep cyclone at sea level pressure to 500 hPa pressure from eastern Mediterranean to western of Iran and also the establishment of a subtropical jet stream with meridian direction (southwest-northeast) in the southwest and west of the country and finally the intense vertical shear of horizontal wind from sea level pressure to 200 hPa in the study area, It is known as the main factors of cause of instability in the west and southwest of the country. existence Specific humidity of 14 to 18 g / kg at sea level pressure and relative humidity of 95 to 100% at a pressure of 700 hPa have also been identified as suitable moisture conditions in the study area. Discussion and Conclusion: The results of this study show that on March 31 and April 1, 2019, the atmosphere of the western and southwestern regions of the country in all depths of the troposphere layer experienced severe instability due to the establishment eastern part of a deep cyclone. Above the cyclone mentioned above, located meridional flows of subtropical jet stream which has intensificated the instability to the depth of the tropospheric layer. Also moisture advection from the western Arabian Sea, the Red Sea and the Persian Gulf has caused form cells from thick convective clouds throughout the west and southwest of the country. The heavy rains resulting from these convective clouds have caused severe and extensive floods in this area of the country.

Background and Objective: In a natural watershed, most of the surface is impervious and covered with vegetation, so a large amount of precipitation is lost through plant interception, infiltration into soil and evapotranspiration. However, in an urban watershed due to urbanization, impervious surface of the watershed increases, which tends to increase the volume of runoff and peak discharge, the erosion of the bed and the edges in the downward of canals, and decrease in water level as well as degradation of water quality. The purpose of this research is to apply SWMM simulation for estimating runoff and runoff hydrograph and the effects of land cover changes and low impact development tools on hydrologic response of urban watersheds. Method: In this research, implementation of SWMM model in one of the urban areas of Qom was considered. The study area is 256 hectares in northwestern part of Qom. Findings: In this study, it was concluded that in sub watershed of 2 and 6, the increase of 70% and 40% in impervious surfaces resulted in 30% increase in runoff volume. Also, 10% increase in impervious area of upstream and downstream of watershed tends to 6/51% and 6/87% increase in peak discharge volume, respectively. The use of storage devices has also had a significant impact on reducing urban runoff. Discussion and Conclusion: The results of SWMM model in urban runoff estimation indicate that in order to properly manage runoff in arid areas, the status and location effects of land use on urban runoff rate as well as the use of rain storage tools in these areas should be considered.

Economic development and international trade have led to the formation of a global interdependent economic system, which is becoming a unique international system due to the development of human societies and basic needs in the present era, and in this regard, the international institutions have played a major role. If the business rules are clearer and more predictable, they can, at the same time, meet mutual interests of both energy exporting In fact, globalization of energy trading has increased the importance of its role in economic relations between countries through the international investment, deregulation ofdomestic markets of countries, and a new connection between the area of energy in different countries and the political economy in the word. The present studydescriptive way, explored internat ional energy rules as well as energy trade multilateral system and tried to determine whether energy products are different from other products and require certain trade rules. It also examines the obstacles to make regulations in the area of trade energy in wto regarding characteristics of different kinds of energy.

Background and Objective: It is important to determine the ecological capacity of zones for appropriate location of urban places. In zonation these are different factor. The study attempts prioritize these factors and to develop the zonation map of the province of Mazandaran using models of ecological urban development, information value and correlation. Method: At first, effective ecological factors in determining appropriate zonation for urban development in the form of information layers were developed in Arc GIS environment the urban development ecological model was used for determining range of each class. However for calculating the weight of classes in each factor model of information value was used through comparing areas of cities in each class with the whole area. The weight of factors effective on zonation was calculated using the appropriate weight for each layer and implementing the above mentioned models. Findings: Results show that elevation of 0-400 and 1200-1800 meters, slope of 0-6 percents, the northern direction, quaternary fluvial, precipitation of less than 500 and higher 800 millimeters, wet of less than 60 percents and vegetation density of 30-60 percents are appropriate for urban development. Discussion and Conclusion: factors of soil, lithology, elevation, slope, vegetation, wet, rain and aspect received the highest to the lowest priority in location of urban areas and obtaining zonation map respectively. Evaluation of the models indicated the information value is of a higher accuracy.

Background and Objective: Due to the need for citizens to be aware of the value of clean air and the impact of pollution on their assets, as well as the possibility of better analysis of projects and compare them with each other and selecting the best and least expensive project for policy makers and economic planners, this study The value of clean air and the willingness to pay to improve air quality has been estimated by citizens in the metropolis of Tehran. Method: In contrast to the conventional economic method in which the value of a commodity is calculated for all commodity availability, hedonic is a method by which the value of enjoyment is determined by the characteristics of a commodity. The hedonic pricing method is the observed price of a commodity regression On its qualitative attributes, therefore, it can be said that hedonic method considers the demand of a product or input as a function of its characteristics. In this research, we used the data of the transactions carried out in the housing market of Tehran during the period of 1395 and based on the three structural, neighborhood and environmental characteristics we have estimated the price of the Tehran's hedonic price function. Accordingly, 7141 samples of real transactions were collected by simple random sampling from 22 areas of Tehran. Findings: The results show that 81 percent of logarithmic changes in housing prices are explained by selected variables in a two-way logarithmic model. Most of the variables used are meaningful and have an expected sign. Also, using the implicit derivative, the coefficient of air quality index is estimated from the function of the hedonic price. Discussion and Conclusion: The final desire to pay for a unit of air quality index (improvement of air quality index) for each household in Tehran is equal to the figure of about 3 million rials. According to the average purchase area of 72 square meters in Tehran, the final desire to pay per square meter is 42 thousand Rials.

Background and Objective: Inattention to the climatic features of different regions and the absence of sufficient knowledge of the design principles for optimal use of the potentials of the natural environment leads to higher costs and waste of energy in various fields. Accordingly, due to high humidity in Amol and high cost of ventilation and reduction of moisture in summer, the main objective of this research is to examine and analyze the simulated openings of a residential building with a natural ventilation approach. Method: the present study was carried out in the first step by reviewing the subject literature on this issue and identifying the concepts and principles of residential building design in the field of energy. Then, by supplying the climate information file of Amol from the Weather Meteorology Center for the Climate Consultant software, Design elements were presented. Subsequently, the components were analyzed by Expert Choice software based on the AHP method and computation of component weight led to the final decision in choosing the most important component. Finally, with the simulation of the building in the Flow Design software, the impact of natural ventilation on residential slopes was investigated. Findings: seven components were extracted from the above software as principles of the design and tables of climate interpretation. In the following, with the hierarchical analysis method (AHP), a natural ventilation component with a weight of 0. 399 was found to be the main component of the static solar power system. Discussion and conclusion: A natural ventilation pattern was designed in a building with a sloping roof and specific dimensions in the Amol climate. By changing the layout of two 1-square-meter openings on two walls with a height of 2. 7 meters in opposite directions at two heights of 1 and 1. 7 meters from the floor of the building, 4 airflow modes were simulated with regard to the wind speed of the area in the Flow Design software. In this simulation, by placing the wind tunnel perpendicular to two walls, it can be stated that the best natural ventilation efficiency from these four conditions, is the one with two under-roof structures at 1. 7-meter height with the highest wind-suction coefficient of 1. 19, which will make a reasonable ventilation and air flow in the simulated residential building.

The current study was carried out in the form of a survey aimed at identifying factors affecting the consumption of green products among Khoramabad citizens. The statistical population was the people of Khoramabad, out of which a sample of 386 individuals were randomly selected using multistage random cluster sampling. First, the city was divided into 8 blocks with respect to economics and culture, then a street was selected from each block, and finally all the street residents were studied. The data collection tool used in the study was a questionnaire designed by the researcher. Confirmatory factor analysis (CFA) was used to assess the reliability of the questionnaire’ s variables. We attempted to develop a reliable model using structural equation modeling to explore factors affecting the consumption of green products in Khoramabad city. The results of this survey indicated that “ price fitness” and “ product quality” directly (r =0. 35), consumers social responsibility directly (r = 0. 23) and indirectly (r = 0. 06), consumers “ health orientation” directly (r = 0. 23), “ consumers’ environmental knowledge” indirectly (r = 0. 08), and “ product image” indirectly (r = 0. 05) are associated with the consumption of green products. The final model explains 37% of the variance of green consumption. It also became clear that the coefficient of “ health orientation” and “ consumption of green products” among individuals with a history of foreign traveling and use of the Internet was higher.

Background and Objective: According to the concept of desertification, which is land degradation in dry areas, the semi-arid, and dry sub-humid due to many factors such as climate change and human activities, this phenomenon has long been known as a serious problem in terms of economic, social, and environmental in many countries. The purpose of this study was to study the desertification of Faryab city in southern Kerman province using Iranian IMDPA method. Method: The aim of this study was assessed desertification potential of Faryab region in the arid region of south of Kerman province by using the Iranian model of desertification potential assessment (IMDPA) on soil and vegetation cover indicators. Each criterion was assessed based on the selected indices which result in qualitative mapping of each criterion cased on geometric average of the indices. Thematic databases, with a scale of 1: 50000 were integrated and elaborated in Arc GIS 9. 3. By laminate of thematic databases layers and using this formula DM=(VQI×SQI)1/2 to Calculate the geometric mean Criteria. Then Desertification intensity map was obtained with analysis IMDPA Model. Findings: Results indicated that 14. 53% of study area classified as low class, 33. 69% is classified as moderate class and 51. 78% of area classified as a severe class of desertification. Analysis of desertification criteria in Faryab region showed that among study criteria, regeneration of vegetation of vegetation cover is a major problem with a geometric average of 3. 82. Discussion and Conclusion: According to the results of this research, which indicates the importance of vegetation in desertification, it is suggested that a deeper investigation of the appropriate methods of remediation and improvement of the rangelands of the region be undertaken by the Natural Resources Department. In the case of lack of attention from the authorities, about 50% of other (medium and low desertification classes) will be subject to severe destruction, which will lead to damage to other elements of the ecosystem, including wildlife, and so on.

Background and Objective: Studying the extent of change and destruction in resources in previous can contribute to efficient planning and utilization of these resources and limiting similar adverse changes in the future. Since changes in resources occur over large expanses of land, remote sensing technology can serve as a essential and valuable tool for monitoring these changes. The purpose of this study was to monitor the land cover changes in Qaresu watershed in Ardabil province using the remote sensing technique. Methods: In this study land cover changes was consulted in 30 years from 1985 to 2015. Landsat images of the study area pertaining to July 1985, 2000 and 2015 were acquired. After geometric and elevation corrections, the images were classified by the supervised approach using the maximum likelihood method. The NDVI index, DEM, and slope layers were used to enhance the image classification accuracy. Classification accuracy was assessed with Kappa index and overall accuracy indexes. Findings: The results showed 20. 43% change in the watershed’ s land uses over the period from 1985 to 2000, 41. 426% over the period from 2000 to 2015, and 27. 99% over the period from 1985 to 2015. In all three periods, the greatest changes were in dry farming. Discussion and Conclusion: Results showed despite high capability of Landsat images in mapping land use, using additional layers like NDVI, elevation and slope percent can improve separation accuracy of land using.

Background and Objective: Layered double hydroxides are a class of anionic clays that have received many attentions due to their multifunctional properties in numerous fields as drug supports, catalysis application, adsorption and photocatalysts. The main goal of this study is the synthesis and application of nanostructured layered double hydroxides fibers as sorbent for extraction and determination of agriculture pesticides by the headspace solid phase microextraction method. Method: At first part of study, LDH/DABCO/PW fiber was synthesized. The prepared fiber was characterized by SEM, FT-IR and TGA. Then, applicability of fiber for extraction of agriculture pesticides in river water samples by the head space solid phase microextraction method was evaluated. Findings: The results revealed that prepared fiber is appropriate for quantitative determination. Identification of desorbed analytes from the surface of fiber was performed in combination gas chromatography coupled with mass spectrometry. Under the optimized conditions, response was a linear function of concentration over the range0. 001-100 μ g L⁻ ¹ . Correlation coefficients (R2) ranged from 0. 965 to 0. 999. And the limits of detection (LOD) were between 0. 002-0. 03 μ gL⁻ ¹ . The proposed fiber was successfully used for the determination of agriculture pesticides in spiked river water samples and RSD values were obtaine in the range of 4. 9%-11. 1%. Discussion and Conclusion: The results showed that this proposed method has a good Dynamic Linear Range, repeatability and high sensitivity. It can also be used to extract other pesticides. Cheap and green, high sensitivity, no solvent use and low diagnostic limit are the unique advantages of the proposed method.

Background and Objective: Throughout history, mosques have always provided different aspects of body, function and meaning. These three parameters are put together as layers that the lack of each can undermine the performance of contemporary mosques compared to the performance of ancient templates. In this regard, this study will examine and compare contemporary examples of architectural design patterns in line with the "conceptual model of research" based on "criteria influencing architectural design patterns through religious concepts" in mosques. Method: In order to extract the architectural components derived from religious concepts in all three dimensions, library and documentary studies were used to collect data through descriptive-analytical research method. And in the second step, after developing the conceptual model of the research, it payed to the field evaluation (in 1397) and scoring of the architectural components in the sample community (contemporary selected mosques in Tabriz) which were selected by purposeful sampling by experts in the field. Findings: Architectural design components of mosque in line with religious concepts can be divided into 3 functional components (special entrance, neighborhood, location and design of different spaces), semantic components (readability, sense of place and hierarchy) and physical components (orientation, attention to light, and proper design of the mihrab, dome, minaret, and courtyard). Discussion and Conclusion: By assessing the effectiveness of contemporary Tabriz mosques in each of the three dimensions, it can be concluded that the sub-component of "different spaces" in functional dimension, "sense of place" in semantic dimension, and "light" in physical aspect have been most emphasized. Also, the results show that the architecture of the contemporary mosques in Tabriz was more in line with the semantic dimension of the patterns than the other two dimensions. Also, Imam Reza Mosque (AS) has the most conformity with ancient patterns from the point of view of architectural design patterns based on religious concepts.

Background and Objective: In this study, some samples of bed sediments from Rasht rivers were obtained and 19 organochlorine pesticides (OCPs) were determined for specifying the contamination profiles, distribution characteristics, effective factors and hazard of carcinogenic compounds. OCPs as Persistent Organic Pollutants (POPS) haskhown vast distribution, persistence and accumulation in the environment. Their high toxicity to humans and non-target organisms are a significant threat to human health and biodiversity. Method: Identify and determine the concentrations of organochlorine pesticides analysis were conducted on bed sediment samples by liquid-liquid micro extraction method and then by gas chromatography flame ionization (GC-FID) and via external standard calibration curve drawing. Findings: Based on the analysis, total concentration of OCPs is in the range of 2. 6-60. 2 ng/g, with an average of 20 ng/g. The main sources of pollution are Heptachlor, HCHs, DDTs and Endosulfans and highest contamination of the dominant pollutant DDE isomers belonges to sediments of Pir Bazar River. Discussion and Conclusion: The results are showed that there were various amounts of new and past entries. The analysis shows that the potential source of high levels of DDTs and HCHs residues of pesticides returns to the pastconsumptions.

Background and Objective: Using seawater to produce crops is one way to combat this dehydration. For use of seawater, saline species should be selected according to the existing conditions. Species that is able to grow in saline conditions and desirable performance. The purpose of this study was to compare the yield of saline species with seawater so that plants with high forage yield and compatible with the environment can be selected and proposed for cultivation in coastal lands of Mazandaran. Method: In order to survey of halophyte forage plants characteristics, a factorial experiment was conducted at Research Station of Sari Natural Resources Faculty in a randomized complete block design with three replications in 2016. The test factors included four Medicag polymorpha, Medicag scutellata, Medicago litoralis, Medicago truncatula and five sea saline water levels (0. 6, 3. 8, 6. 4, 9. 6, and 14. 2) ds/m. Findings: The result of Analysis of variance showed that germination percentage in electrical conductivity, 3. 8, 6. 4 and 9. 6 ds/m, there was not seen a significant difference (p ≤ 0. 05) between two species (M. polymorpha and M. scutellata) and species (M. truncatula and M. litoralis). During the establishment phase (60 days), there was a significant difference between each species (p ≤ 0. 05). In electrical conductivity of 3. 8 and 6. 4, M. polymorpha species showed a significant difference with other species, but there was no significant difference between the other three species. Discussion and Conclusion: The results of this study indicate that M. polymorha, M. scutellata species show more tolerance in salinity conditions (p≤ 0. 05).

Background and Objective: This is a cross-sectional descriptive study with the aim of Measure and determine the concentration of suspended particles: PM10 PM1; PM2. 5; And NO2 gases; SO2; CO; HC in open air six important passenger terminals and traffic jams in the metropolis of Tehran. Method: Using portable device MET ONE to measure suspended particles and the portable device Aeroqual to measure gases in the course of one year, from autumn 94 to summer 95. Samples were analyzed using software SPSS; EXEL. Findings: The results of this study showed that the highest concentration of suspended particles was PM1 with an average of 1. 20 micrograms per cubic meter; PM2. 5 with average of 6. 72 micrograms per cubic meter; PM10 with an average of 100. 23 micrograms per cubic meter; CO concentration with a mean concentration of 6. 95 ppm, NO2 with a mean concentration of 0. 05 ppm, SO2 with an average of 0. 05 ppm HC, with an average of 2. 56 ppm in winter. Discussion and Conclusion: The reasons for the increase in pollutants include: low temperature, no wind blowing, air reversal, terminal location, surrounding pollutants and type of fuel and technology used on buses. Using the results of this research, we can devise appropriate methods for controlling and reducing air pollutants with the aim of improving the system in these sites.