Showing 28 results for ahmadi
Abolghasem Amir Ahmadi, Leila Goli Mokhtari, Naemi Tebar Mahnaz,
Volume 23, Issue 70 (9-2023)
Abstract
The purpose of this study was to identify evidence of late Quaternary glaciers in the northern highlands of Binalood. Topographic maps, satellite imagery and climatic data are the tools and data used in this study. Arc gis 10.4 software was used for data analysis. Quaternary glacier evidences were identified based on four types of evidences including morphic indices, climatic evidences, geomorphological evidences and laboratory indices. Using morphic indexes, the curve lines were identified on topographic maps of satellite imagery, ice-dominated areas, and the effects of 28 glacial circuses. Climatic evidence shows that not only was Quaternary at about 7 degrees cooler than the present time, but its precipitation was almost twice as high as at present. On the other hand, glacier circles, moraines, thales and glacial mounds were the most prominent geomorphologic evidence of glaciers in the Binaloud Heights. Finally, granulometric laboratory indices supplementing the evidence of glaciers have confirmed the existence of glacial sediments at the Binaloud Heights. Also, using Wright's method, the permanent snow boundary line during the reign of Binalood Heights Glaciers was estimated at 2600 m.
Reyhane Salehabadi, Syrus Ahmadi, Afshin Motaghi,
Volume 23, Issue 71 (12-2023)
Abstract
Borders are known as places where government institutions implement their own law in a variety of ways and forms. Given the different approaches to border control and management, it can be seen that this issue is still viewed as a security issue in developing countries, including Iran, and most of the approaches related to this are from a purely security perspective. The boundary view must be multidimensional and comprehensive. In this study, we seek to answer the questions of how land border management can be done. And which of the indicators of border management is more weighty and important? Therefore, the research method is a combination of Kendall, Demetel and AHP methods. The findings of the study show that we have five main components of border management in economic, cultural-social, civil, security-military and integrated management, and each of the seven components. Using these techniques, it can be stated that indicators such as identifying and identifying opportunities and identifying their fertility factors (0.1), studying and understanding the geographical location and spatial conditions of border regions (0.099), can be determined and determined. Identifying threats and identifying their roots and factors (0.098) and excluding border areas of isolation (0.096) are the most important. Therefore, it can be concluded that border management should be considered in combination with other factors, ie the application of only one approach, such as economic or security, cannot solve the problems of the country's border regions.
Akbar Mirahmadi, Hojjatollah Yazdan Panah, Mehdi Momeni,
Volume 24, Issue 72 (3-2024)
Abstract
In recent years, the technology of crop production has been greatly expanded using satellite data. Today, Landsat 8 and OLI sensor data, with a spatial resolution of 30 meters, allow the discovery of factors that control phenology on a local scale. In this study, the remote sensing indices - NDVI, EVI, Greenness, and Brightness - obtained from the OLI sensor and the GCC index obtained from digital camera images were used to estimate the phenological stages of the rapeseed plant. The Savitzky-Goli filter was used to remove outlier data and to produce smooth curves of time series of plant indices. The results showed that the curves obtained from the indices of NDVI, EVI, GCC show all four stages of remote sensing phenology – green-up, dormancy, maturity, and senescence - well, but the Greenness index did not show the dormancy stage well. The Brightness index curve shows the inverse behavior to other curves. According to Pearsonchr('39')s correlation test, GCC index data are correlated with NDVI and Brightness index data .we used the ratio threshold, rate of change and first derivative methods, to estimate "start of season" and "end of season" and the results showed that the first derivative and ratio threshold methods with an average difference of 18 and 19 days in the "start of the season" and the rate of change method, with an average difference of 8 days, has the best performance in estimating the “end of the season”. Also, the Brightness index with an average difference of 16 days and the EVI index with an average difference of 7 days have the best performance in estimating "start of season" and "end of season", respectively.
Sanam Afaridi, Fereshte Ahmadi, Ali Soltani, Mahmood Mohamdi,
Volume 24, Issue 73 (6-2024)
Abstract
Optimal condition of accessibility and rapid, easy, and safe travel to health_ treatment land uses can be performed by the systematic analysis of transportation sub-systems like behavior. Developed countries are in essential need of proper transportation system for better accessibility. This paper aims to develop model, considering mode chains as well as the individual characters. This study benefits the analytic and quantitative research methods in developing mode choice model to evaluate the movement pattern of travel to health care centers in Shiraz central district (district 1). Each mode is the dependent variable whereas the socioeconomic characters are the independent variables. Filled questionnaire and geographical information system is used in collecting data. To generate the model, multinomial logit model was used that shows public transport like metro and bus are not the popular modes in access to hospitals. Movement pattern cognition in accessibility to special urban land uses, has an efficient role in urban policies and planning, which can be generalized and indigenize to healthcare travel behavior in other geographical areas. Results show that car ownership will increased the private car travel rate 8 times according to beta coefficient.. Taxi is the mode which is used in all three travels. People with lowest range of income and education use bus as their mode. Besides metro travel also has significant relation with low level of income and increase the travel rate 9 times.
Keywords: logit Model, Hospital, vehicle, travel mode, Shiraz City.
Ms Parisa Ghorbani Sepehr, Dr Zaki Yashar, Dr Seyed Abbas Ahmadi,
Volume 24, Issue 75 (12-2024)
Abstract
Due to its location in low latitudes, Iran is among the countries that has not been spared from the security consequences of climate change. The present study seeks to answer two questions: 1) What are the security consequences of climate change on Iran and which components have the greatest impact on Iran? 2) Which of the pillars of good governance as a solution has the greatest impact on reducing the effects of climate change on Iran?
In this study, the study population is elites and experts familiar with the subject of the study, 100 of whom were selected for snowball sampling and a researcher-developed questionnaire was used to collect data. Data were evaluated using SPSS and MINITAB software. The results of the studies according to the obtained P-value which is equal to 0.000 and is less than 0.05 alpha, indicate the difference between the natural and human consequences of climate change in Iran. The results of the Tukey test indicate that the natural consequences of climate change with an average of 4.0584 are in group A and the human consequences with an average of 3.4460 are in group B. Also, the results of Friedman test on the effect of good governance in controlling and reducing the security consequences of climate change in Iran show that accountability with an average of 5.79 in the first place, rule of law with an average of 5.62 in the second place. and accountability of officials with an average rating of 5.32 are in third place.
Hamed Heidari, Darush Yarahmadi, Hamid Mirhashemi,
Volume 24, Issue 75 (12-2024)
Abstract
Human interventions in natural areas as a change in land use have led to a domino effect of anomalies and then environmental hazards. These extensive and cumulative changes in land cover and land use have manifested themselves in the form of anomalies such as the formation of severe runoff, soil erosion, the spread of desertification, and salinization of the soil. The main purpose of this study is to reveal the temperature inductions of the land cover structure of Lorestan province and to analyze the effect of land use changes on the temperature structure of the province. In this regard, the data of land cover classes of MCD12Q2 composite product and ground temperature of MOD11A2 product of MODIS sensor were used. Also, in order to detect the temperature inductions of each land cover during the hot and cold seasons, cross-analysis matrix (CTM) technique was used. The results showed that in general in Lorestan province 5 cover classes including: forest lands, pastures, agricultural lands, constructed lands and barren lands could be detected. The results of cross-matrix analysis showed that in hot and cold seasons, forest cover (IGBP code 5) with a temperature of 48 ° C and urban and residential land cover (IGBP code 13) with a temperature of 16 ° C as the hottest land use, respectively. They count. In addition, it was observed that the thermal inductions of land cover in the warm season are minimized and there is no significant difference between the temperature structure of land cover classes; But in the cold season, the thermal impulses of land cover are more pronounced. The results of analysis of variance test showed that in the cold period of the year, unlike the warm period of the year, different land cover classes; Significantly (Sig = 0.026) has created different thermal impressions in the province. Scheffe's post hoc analysis indicated that this was the difference between rangeland cover classes and billet up cover.
Dr Esmaeil Najafi, Mr Abolfazl Faraji Monfared, Dr Mehdi Ahmadi,
Volume 25, Issue 76 (3-2025)
Abstract
The expansion of arid and semi-arid regions in Iran has caused that most of the mentioned phenomena to be seen in the study area. Alluvial Fans are the landforms that are spread in different areas.
Identifying the productive processes and assessment of their effects can help to manage natural hazards, as well as help the land use planning. In the present study, the tectonic activity at the surface of alluvial fans in the south of Kharqan Mountain in the northeast of Hamadan province was studied. The studied Alluvial Fans were located in the south of the Kharqan Mountain in the northeast of Hamadan province. First, the process of development of Alluvial Fans in the area using different maps was investigated (consisting of two Gozel Valley, Celery conifers, and several small Alluvial Fans), and the available evidence on the tectonics of alluvial Fans in the area were studied. The obtained results of the research show that in parts of area such as the eastern of the gozel valley cones the tectonics is active, and the areas such as alluvial Fans that be located between the Gozel Valley was inactive. Other evidence in the bed of the Gozel Alluvial Fans shows the changes in terrain due to the activity of faults in the eastern part of the study area, which changed the pattern of waterway movement in the riverbed and led to the destruction and exploration of the river. Also, the drainage pattern and sediment depth at the surface of alluvial fans were due to tectonic activities in alluvial fans. The prepared geological logos show the slow and active periods in different geological periods in the region. Therefore, it started with a long slow period, then continued with tectonic activities and fluctuations.
Mr Syrous Ahmadi Nohdani, Mr Aziz Nasirzade, Miss Reyhane Salehabadi,
Volume 25, Issue 76 (3-2025)
Abstract
When empires and great nations decline, there are many reasons why there is a connection between them. Empire is considered as a regulating power in the world that by studying history, one can discover the existence of several important empires in different eras. Given that empire is related to geopolitical knowledge and its constituent concepts (power, politics and space), it can be studied and explored from this perspective. The purpose of this study is a geopolitical analysis of the collapse of empires. This descriptive-analytical study uses the field method to investigate the geopolitical factors of the collapse of empires (Persia, Rome, Byzantium, Ottoman, British, Russian, Spanish and Arab). The statistical population is 50 experts in the field of geopolitical studies. To test the conceptual model of the research, Demetel method has been used. Findings show that variables such as incompetence and lust of rulers, collapse of the domestic economy, increase and corruption of the male government, oppression and slavery, internal riots, etc. show high interaction and strong systemic relationship with other variables. That is, as long as a country has faced these challenges in terms of manpower and governance, it has not been able to survive in the face of other problems caused by these factors, and these factors have led to crises and the collapse of the empire.
