Analysis of the Impact of Removing Meander on Shear Stress and Energy Line Slope by Hec-ras: A Case Study in Krishan Meander of Karun River

Changes and displacements caused by natural or synthetic factors in the track of geometric characteristics of the river is the logical result of river systems' reaction to establishment of a new balance between erosion and deposition process. In this research, the impact of removing Krishan meander on the shear stress and energy line slope of Karun river flow in Ahvaz interval was studied by hec-ras software in two states. In the first state, the current status of Karun river and in the second state Krishan Meander in the downstream of Ahvaz were ignored and shear stress and energy line slope were compared in two states. By comparing two states, it was concluded that ignoring Krishan Meander, average shear stress and energy line slope increased and the increasing level enhanced with the increase of flood discharge. Shear stress increase also reduced the probability of formation of sedimentary hills in city range

Analysis of the Impact of Removing Meander on Shear Stress and Energy Line Slope by Hec-ras: A Case Study in Krishan Meander of Karun River

Changes and displacements caused by natural or synthetic factors in the track of geometric characteristics of the river is the logical result of river systems' reaction to establishment of a new balance between erosion and deposition process. In this research, the impact of removing Krishan meander on the shear stress and energy line slope of Karun river flow in Ahvaz interval was studied by hec-ras software in two states. In the first state, the current status of Karun river and in the second state Krishan Meander in the downstream of Ahvaz were ignored and shear stress and energy line slope were compared in two states. By comparing two states, it was concluded that ignoring Krishan Meander, average shear stress and energy line slope increased and the increasing level enhanced with the increase of flood discharge. Shear stress increase also reduced the probability of formation of sedimentary hills in city range

Evaluating autoimmunity markers (TPO Ab, Tg Ab and TM Ab) in hypothyroid patients of Bushehr province

Background: Chronic autoimmune thyroiditis (Hashimoto's Thyroiditis) is the common cause of primary hypothyroidism in iodine sufficient countries. Iran is named an iodine sufficient country, in this century. Methods: A total of 88 hypothyroid patients, on suppressing dose of levothyroxine who were followed in a university endocrine disorder clinic were evaluated for serum thyroid autoimmunity markers: thyroid peroxidase antibody (TPO Ab), thyroglobulin antibody (Tg Ab) and thyroid microsomal antibody (TM Ab) using ELISA method. Results: The prevalence of TPO Ab, Tg Ab and TM Ab were 73.9%, 45.5% and 71.6%, respectively. Among the patients with high level of TPO Ab (> 75 u/ml), 45.3% had grade 1 or 2 of goiter (P< 0.05). Conclusion: Autoimmune thyroid disease (Hashimoto's thyroiditis) is the most common cause of hypothyroidism in Bushehr province

Helping HSE Team in Learning from Accident by Using the Management Oversight and Risk Tree Analysis Method

Introduction: The effects of accidents vary from minor injuries to fatalities and from insignificant damage to severe damage to the environment and property. In order to prevent accidents in the work place, the root causes of and events should be identified using a systematic method and the results should be published. The current study aims to investigate the given causes of an accident in order to implement preventive actions in accidents and similar organizations. Materials and Methods: In this case study, after choosing the main event; to analyze the accidents, at first a set of questions in Management Oversight and Risk Tree (MORT) were answered. By answering the questions, the final events, and the inappropriate management risks (color-coded red) followed by the leading causes of the accident were identified. Results: After analyzing the given accident, 22 inappropriate final events (color-coded red) and 4 assumed risks were identified. Of the total 12 identified basic causes, about 75 % were classified as the management policies and decision makings group, 17 % as the individual factors, and 18 % as the environmental factors group. Conclusion: The analysis using MORT method helped the organization with learning lessons from the accident especially at the management level. In order to prevent the similar and dissimilar accidents, the inappropriate informational network within the organization, inappropriate operational readiness, lack of proper implementation of work permit, the inappropriate and lack of updated technical information systems regarding equipments and working process, and the inappropriate barriers should be considered in a special way