Showing 5 results for Kalteh
Volume 10, Issue 4 (Fall 2022)
Abstract
Aims: COVID-19 Vaccination Hesitancy is a public health concern in the world. The present study aimed to determine the prevalence of vaccination hesitancy and its relevant factors using the health belief model among people in northeast Iran.
Instrument & Methods: The present cross-sectional study examined 626 people using convenience sampling. Data were collected through an online survey using a questionnaire based on the health belief model at intervals of 10 September 2021 and 15 October 2021. Data were analyzed by using SPSS 16.
Findings: Overall, 70.6% of the samples reported that they would use the vaccine for free after it becomes available. Health belief model constructs predicted 40% of the variance of vaccination behavioral intention. The results indicated that the perceived barriers were significantly related to using the vaccine, thereby reducing the probability of using the vaccine by 10% (Relative Risk Ratio=0.90, 95% CI: 0.82-0.99). Perceived benefits (Relative Risk Ratio =1.21, 95% CI: 1.11-1.32), perceived susceptibility (Relative Risk Ratio =1.54, 95% Cl: 1.23-1.92), and behavioral intention (Relative Risk Ratio =3.06, 95% CI: 2.23-4.20) had a significant relationship with the probability of using the vaccine.
Conclusion: About one-third of the participants had COVID-19 vaccination hesitancy. Interventions are necessary to increase compliance with vaccination, especially among people with low education levels. The health belief model constructs have a high power of predicting hesitancy and acceptance of COVID-19 vaccination and can be used in intervention programs.
Volume 12, Issue 48 (9-2015)
Abstract
The aim of this study was to evaluate the effect of edible gelatin coating on the quality characteristics and shelf life of fish finger of Hypophthalmichthys molitrix during refrigerated storage. Fish fingers were immersed in coating solutions of gelatin 4% and then dried, packed and stored in refrigerator (4˚C). Chemical (moisture, protein, fat, ash, pH, PV, TBA and TVB-N) and microbial parameters (TVC and PTC) were measured at 0, 3, 6, 9, 12, 15, 18 and 21 days. According to the obtained results by increasing of storage time moisture and fat content decreased and pH value were significantly increased (P < 0.05). While there was no significant difference between the ash content of control and coated samples (P < 0.05). Peroxide value and thiobarbitoric acid of coated samples were lower than the control. The TVB-N value of control and coated samples were 27.80 and 27.46 mg N/100g of flesh fish in 12 days of storage that higher than acceptable value. The total viable count (TVC) and psychrotrophic count (PTC) of fish fingers were significantly increased (P < 0.05) during refrigerated storage. The results of this research indicate that the gelatin coating reduces the oxidation, but has no effect in reducing the value of microbial count.
Volume 13, Issue 52 (4-2016)
Abstract
The purpose of this study was to investigate the effect of different methods of preparation of raw rainbow trout (Oncorhynchus mykis) (full, empty stomach, fillets and fillets of butterflies) on quality and shelf life was over 4 months of storage in home freezers. To this end, rainbow trout transferred to the laboratory and washed, were prepared by the method described and qualitative assessment of fish at the end of each month by measurement of chemical parameters (free fatty acids, thiobarbituric acid, protein, fat, moisture, ash, under pressure moisture, pH, heme iron content) and sensory (flavour, odor, texture, color) were performed. With increasing storage time heme iron content reduced, so that at the end of storage heme iron content was more in treatment of whole fish. Also under pressure moisture, TBA nad FFA increased in different treatments and in the fourth month of storage, the rate of these variables were lower in treatments of whole fish. Sensory analysis results indicate utility of all treatments decreased with increasing storage time but the rate of decline was less than in whole fish. According to the results, as can be fish kept in perfect shape than in other forms it is recommended.
N. Sheikhizad , M. Kalteh ,
Volume 19, Issue 3 (March 2019)
Abstract
In the present study, the electroosmotic and pressure driven flow of nanofluid in a microchannel with homogeneous surface potential is investigated by using the Poisson-Boltzmann equation and the flow field is assumed to be two-dimensional, laminar, incompressible, and steady. Distribution of nanoparticles in the base fluid is assumed to be homogeneous; therefore the nanofluid flow is modeled as a single phase. The thermal conductivity of the nanofluid is modeled by using the Patel model to account for temperature dependency. In order to validate the numerical solution, the results are compared with available analytical solutions and the comparison shows a good match with the results. Then, the effects of different parameters such as ion molar percentage, volume fraction, and nanoparticles’ diameter on the flow field and heat transfer are examined. The results show that by fixing the electric field and increasing the pressure gradient, the local Nusselt number will decrease, and by fixing the pressure gradient and enhancing the electric field, the Nusselt number increases. The average Nusselt number increases about 45, 35 and 25% while nanoparticles’ diameters are 100, 110 and 120nm, respectively. For Γ=0.05, the average Nusselt number increases 10% while ion concentration changes from 10-4 to 10-2. Furthermore, the direction and magnitude of velocity and concavity of the velocity profile can be controlled by choosing a suitable phase angle between electrical and pressure driven flow parameters.
M.a. Yazdanpanah Jahromi , K. Atashkari, M. Kalteh,
Volume 19, Issue 12 (December 2019)
Abstract
Gasification technology is an important part of clean coal technology. Further development of this technology requires understanding the processes and interactions of gas and solid fuel particles injected into the gasifier. In this study, a numerical simulation of an entrained flow coal gasifier has been investigated using experimental operating conditions. The reactions and kinetic parameters of the gasification process have been extracted using coal gasification data obtained from similar published papers. Comparison of the simulation results with experimental data and two other similar studies confirm the accuracy of the developed model. The focus of this study is on the accuracy of the models presented for the devolatilization process and the effect of the oxidizer change from oxygen to air on the gasifier performance. Four devolatilization models including chemical percolation devolatilization, single rate, Kobayashi and constant rate models have been investigated. The predicted trends of species changes are similar in different devolatilization models but the amount of produced syngas is somewhat different depending on the accuracy of each model. The Kobayashi and constant rate models predict the devolatilization rate lower than the other two models. The results obtained from the chemical percolation devolatilization model are more consistent with the experimental data compared to the other models but require higher computational times. The use of air oxidizing agents reduces the concentration of produced syngas rather than oxygen and hence reduces the gasifier efficiency.
