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  1 - The assessment of freezing-thawing index of aggregates in various environments of Northwest Direh catchment, Kermenshah Province
  کاظم  بهرامي Seyed Mahmoud  Fatemi Aghda Ali  Noorzad Mehdi  Talkhablou
  Considering the effects of geological environments of natural aggregates accumulation on the weight loss rate of aggregates resulted from freezing-thawing, the relationship between geological environments and the weight loss rate of aggregates has been investigated in t More

  Considering the effects of geological environments of natural aggregates accumulation on the weight loss rate of aggregates resulted from freezing-thawing, the relationship between geological environments and the weight loss rate of aggregates has been investigated in this study. The lithology of upstream catchment was the same (thick Asmari limestone) for all aggregates samples. Samples were gathered from 2 taluses, 12 fans and 3 river beds. Samples were transferred to laboratory and then the weight loss rate (in accordance with tex-432- A standard) and the jointing intensity were measured. Based on the results, colluvial environments (taluses) have the highest weight loss rate (14% for size of 16-19 mm) and river environments have the lowest weight loss rate (less than 1% for size of 2.36-4.75 mm). The aggregates of alluvial fans have the intermediate amount compared to two previous environments. In alluvial fan aggregates, the weight loss rate decreases when the area and length of main stream of catchments increases. Also, aggregates size affects the weight loss rate so that increase in the size of aggregate causes the rise in weight loss. Relationship between aggregate size and weight loss rate is affected by geological environments. The difference of weight loss between fine and coarse aggregates is high in talus environments as well as alluvial fans with small catchments, while it is less in river beds and fans with large catchments. In fact, the size effect of aggregate on weight loss decreases or eliminated in river beds and fans. Manuscript profile
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  2 - Aggregate Production Planning Of L.M.I Corporation Using Grey Goal Programming Approach
  سید محمد‌علی  خاتمی فیروز‌آبادی وحید  پیری
  Nowadays, the organizations’ success depends on planning. The purpose of medium term production planning is optimum usage of human resource, equipment, and capacity to meet demand during a given period. Always, in the organizations, there are multiple and sometimes con More

  Nowadays, the organizations’ success depends on planning. The purpose of medium term production planning is optimum usage of human resource, equipment, and capacity to meet demand during a given period. Always, in the organizations, there are multiple and sometimes conflicting goals in planning. On the other hand, production planning models should be designed so that to be able to deal with uncertainty and lack of information. Grey goal programming technique is the way that not only consider multiple and conflicting goals but also it is able to deal with uncertainty and lack of information. In this research, in order to develop the L.M.I Company’s medium - term production planning is used grey goal programming model. Manuscript profile