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Articles by Majid Lotfalian
Total Records ( 6 ) for Majid Lotfalian
  Aidin Parsakhoo , Seyed Ataollah Hosseini , Majid Lotfalian and Hamid jalilvand
  Problem statement: In this study to evaluate the effects of hillside gradient on forest road cross section components in a loamy clay soil the amount of cut and fill slopes gradient and length, road bed and earthwork width were taken on tangent sections in a lat talar forest roads of Iran. Approach: The objective of this study were: (i) to evaluate the direct effects of hillside gradient on cross section components such as cut and fill slopes, road bed and earthwork width in a loamy clay soil, (ii) to use the model to predict the effect of hillside gradient on cross section components. Results: Results indicated that the regression analysis between hillside gradient and cut slope length had a significant linear relationship (p<0.0001), with equation of Y = 0.046+0.054 X (R2 = 0.60). The equation for the calculation of earthwork width (Y) from hillside gradient was Y = 4.928+0.132 X (R2 = 0.44). A significant linear relationship (p<0.0001), with equation of Y = 0.144x- 2.638 (R2 = 0.64) was found between hillside gradient and fill slope length values. Conclusion: Through analysis of variance it was also found that the hillside gradient had a significant influence (p<0.0001) on the cross section components.
  Majid Lotfalian , Yahya Kooch and Nosratollah Sarikhani
  The aim of this research is to consider roads network quantity by reviewing the effective factors and finally determining the optimal road density. Sangdeh forests of Farim Wood Company were selected for this research that located at Savadkouh region of Mazandaran province (in Iran). In this research it is assumed that the effective factors in costs can be determined by using the mathematical model, as well as by the help of graphical model, less costs of skidding and road construction can be obtained; therefore, optimal road density can be evaluated. Harvesting methods, different types of roads, the ratio of each road to the whole network, stand per hectare, slope, geological conditions, presence of sand mine for constructing surface of roads, capital interest rate, wood exit costs, type of skidding or yarding machinery, slope and length correction coefficient, routes, type and number of load, allowable winching distance, brush and underbrush, condition of the roots, silvicultural methods (cutting form), regional soil, regional height, direction of the slope and morphology of the forest are factors which have been mentioned in this research as affecting determination of roads network density. For this, the model of evaluation and calculation of the time of skidder movement, which determines the skidding costs under the existing conditions in Sangdeh Forest, is as follows: Y = -25.05 + 1.20 X. For the forest region of Sangdeh with 353 cubic meters stand per hectare and skidding in contract method, the roads network density is 23 m in hectare and for skidding by the company, the roads network density is 19 meters in hectare; these numbers are the optimal ones.
  Majid Lotfalian , Zeinab Zadsar , Yahya Kooch and Masomeh Soleiman Nejad
  The objectives of this study were to estimate the quantitative damages on regeneration, comparison of industrial and traditional skidding operations and determine how to reduce utilization damages on regeneration and selection of the best method in North of Iran. In this research, the damages to the regeneration were investigated and compared by using of industrial skidding and traditional methods in Kheirood-Kenar forest (North of Iran). Also, according to this research, rates of damage to the increment groups (cores) of seedling, juvenile and sapling was surveyed. Results from this research showed that the rates of damages were 6.48, 5.34 and 9.57% in industrial skidding and 3.78, 5.34 and 2.13% in traditional skidding, respectively. As perceived, the largest rates of industrial skidding were on sapling group and also rate of the damage to the whole regeneration was 6.45% in industrial skidding and 3.48% in traditional skidding. In these two states most of the damages were in the shape of destroyed and the percentages of wounded samples were the same.
  Hossein Khalilpoor , Seyed Ataollah Hosseini , Majid Lotfalian and Yahya Kooch
  Forest road construction is including high costs as if in operations of road construction the saving be inappropriate thus, it is following more damages. Therefore, this study was performed for estimate of annual sediment mean in a forest road network of forest watershed in southeast of Sari city (North of Iran) using a sediment prediction model with considering to the effective factors. In order to, different data includes: topography, roads and also, precipitation mean were recorded. Result of this research showed that the SEDMODEL model with GIS is appropriate compound for using by road construction managers for prediction of sediment total. This result of it can be used for expansion of road construction in future.
  Aidin Parsakho , Seyed Ataollah Hosseini , Hamid Jalilvand and Majid Lotfalian
  Effects of moisture, porosity and soil bulk density properties, grubbing time and terrain side slopes on pc 220 komatsu hydraulic excavator productivity were investigated in Miana forests road construction project which located in the northern forest of Iran. Soil moisture and porosity determined by samples were taken from undisturbed soil. The elements of daily works were measured with a digital stop watch and video camera in 14 observations (days). The road length and cross section profiles after each 20 m were selected to estimate earthworks volume. Results showed that the mean production rates for the pc 220 komatsu excavators were 60.13 m3 h-1 and earthwork 14.76 m h-1 when the mean depth of excavation or cutting was 4.27 m3 m-1, respectively. There was no significant effects (p = 0.5288) from the slope classes` treatments on productivity, whereas grubbing time, soil moisture, bulk density and porosity had significantly affected on excavator earthworks volume (p < 0.0001). Clear difference was showed between the earthwork length by slope classes (p = 0.0060). Grubbing time (p = 0.2180), soil moisture (p = 0.1622), bulk density (p = 0.2490) and porosity (p = 0.2159) had no significant effect on the excavator earthworks length.
  Aidin Parsakhoo and Majid Lotfalian
  In this study, the AHP and Expert choice software were used for data analysis. The criteria to be used for selecting agents were determined and then scorings were done with authorized engineers. Results indicated that the priorities of the various demolition agents in the case of laminated schist stone was hydraulic hammer>expansive chemicals>dynamite>CARDOX>rock cracker and for dry sandstone, limestone, marl was rock cracker>CARDOX>expansive chemicals>dynamite>hydraulic hammer. Also, the alternatives were arranged as rock cracker>CARDOX>dynamite>hydraulic hammer>expansive chemicals for moist sandstone, limestone and marl. To conclude, this study reveals that decision-making methods can be used in the process of selecting demolition agent for the rock breaking.
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