Studying the relationship between reciprocal services in the supply chain based on the gap model

The purpose of this study is to evaluate expectations and performance of logistic criteria in both supplier and company sections. For this purpose, South Zagros Oil and Gas Exploitation Company and its main suppliers have been selected as statistical population. A sample of 25 couple members were selected from this population and then key gaps were measured through paired comparison test in both direct and inverse manners through a questionnaire. In order to measure the relationship between inverse and direct gap, Pearson correlation coefficient was used. The result of this study revealed that there is no significant relationship between direct and revere gaps

Studying the relationship between reciprocal services in the supply chain based on the gap model

The purpose of this study is to evaluate expectations and performance of logistic criteria in both supplier and company sections. For this purpose, South Zagros Oil and Gas Exploitation Company and its main suppliers have been selected as statistical population. A sample of 25 couple members were selected from this population and then key gaps were measured through paired comparison test in both direct and inverse manners through a questionnaire. In order to measure the relationship between inverse and direct gap, Pearson correlation coefficient was used. The result of this study revealed that there is no significant relationship between direct and revere gaps

Studying the relationship between reciprocal services in the supply chain based on the gap model

The purpose of this study is to evaluate expectations and performance of logistic criteria in both supplier and company sections. For this purpose, South Zagros Oil and Gas Exploitation Company and its main suppliers have been selected as statistical population. A sample of 25 couple members were selected from this population and then key gaps were measured through paired comparison test in both direct and inverse manners through a questionnaire. In order to measure the relationship between inverse and direct gap, Pearson correlation coefficient was used. The result of this study revealed that there is no significant relationship between direct and revere gaps

Characteristics and Assessing Biological Risks of Airborne Bacteria in Waste Sorting Plant

Examining the concentration and types of airborne bacteria in waste paper and cardboard sorting plants (WPCSP) is an urgent matter to inform policy makers about the health impacts on exposed workers. Herein, we collected 20 samples at 9 points of a WPCSP every 6 winter days, and found that the most abundant airborne bacteria were positively and negatively correlated to relative humidity and temperature, respectively. The most abundant airborne bacteria (in units of CFU m−3) were: Staphylococcus sp. (72.4) \u3e Micrococcus sp. (52.2) \u3e Bacillus sp. (30.3) \u3e Enterococcus sp. (24.0) \u3e Serratia marcescens (20.1) \u3e E. coli (19.1) \u3e Pseudomonas sp. (16.0) \u3e Nocardia sp. (1.9). The lifetime average daily dose (LADD) for the inhalation and dermal routes for the intake of airborne bacteria ranged from 3.7 × 10−3 ≤ LADDInhalation ≤ 2.07 × 101 CFU (kg d)−1 and 4.75 × 10−6 ≤ LADDDermal ≤ 1.64 × 10−5 CFU (kg d)−1, respectively. Based on a sensitivity analysis (SA), the concentration of airborne bacteria (C) and the exposure duration (ED) had the most effect on the LADDInhalation and LADDDermal for all sampling locations. Although the Hazard Quotient of airborne bacteria was HQ \u3c 1, an acceptable level, the indoor/outdoor ratio (1.5 ≤ I/O ≤ 6.6) of airborne bacteria typically exceeded the threshold value (I/O \u3e 2), indicating worker’s exposure to an infected environment. Therefore, in the absence of sufficient natural ventilation the indoor ambient conditions of the WPCSP studied should be controlled by supplying mechanical ventilation

Comparision of Chitosan Function as Adsorbent for Nitrate Removal Using Synthetic Aqueous Solution and Drinking Water

Background & Objectives: Nitrate and nitrite compounds pollution of groundwater resources in recent years which recently their mean concentration due to enhancement of different kind of municipal, industrial and agriculture waste water, were increased. The most common source of nitrates entering the water include chemical fertilizers and animal manure in agriculture, septic tank effluent, wastewater, wastewater treatment plants, animal and plant residue analysis on the ground of non-sanitary disposal of solid waste and the use of absorbing wells for sewage disposal. Materials and methods: This experimental study is applied to the nitrate removal using chitosan in laboratory scale at ambient temperature and the design of the system was Batch. Effects of parameters such as pH, contact time, initial concentration and adsorbent concentration of nitrate on nitrate removal from aqueous solution was studied. Results: Function of chitosan in synthetic aqueous solution and drinking water according to the slurry system results, the optimum condition was obtained at pH=4, 20 min contact time and increasing the initial concentration of nitrate enhance the adsorption capacity of chitosan. Also optimum dosage of adsorbent was obtained at 0.5 g/l. The data obtained from the experiments of adsorbent isotherm were analyzed using Langmuir and Freundlich isotherm models. The Langmuir equation was found to be the best fitness with the experimental data (R2>0.93). Conclusion: Although efficiency of Nitrate removal in synthetic aqueous solution was better than drinking water, adsorption process using chitosan as an option for the design and selection nitrate removal should be considered in order to achieve environmental standards