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Showing 3 results for Sabeti
Investigation of physicochemical properties of Echium amoenum flower extract produced with different carriers by spray drying method

Volume 20, Issue 139 (September 2023)
Abstract
In this research, the effect of inlet air temperature (130 and 160°C), type and composition of carriers (maltodextrin, Arabic gum and whey protein concentrate (WPC)) on yield, moisture, bulk density and impact, solubility, wettability, flowability (angle of repose) and hygroscopicity of spray dried borage flower extract were investigated. In all tests, atomizer speed, feed flow rate, feed temperature, and atomizer air pressure were kept constant at 18000 rpm, 10 ml/min, 30 ± 1 °C, and 4 ± 0.1 bar, respectively. The minimum significant difference was calculated at less than (P<0.05) using SPSS software. The results showed that the highest production efficiency (48%) was achieved in dried samples with the combination of maltodextrin and WPC. While the use of protein as a carrier led to a decrease in the amount of moisture, mass and impact density, solubility, wettability and hygroscopicity of particles. The optimization results using the estimated models indicated that the highest solubility and the lowest hygroscopicity are created in the powder dried at 130 degrees Celsius with maltodextrin and arabic gum carriers.
 
Estimating of residual load-carrying capacity of CFST stub columns after exposure to elevated temperatures using gene expression programming

Volume 22, Issue 2 (6-2022)
Abstract
Nowadays, the use of composite sections has become a common practice in the construction industry. Concrete is inherently a brittle material, with high stiffness and compressive strength. On the other hand, steel is a material with high tensile strength and ductility. The simultaneous use of steel and concrete in composite sections improves the performance and leads to optimum exploitation of the properties of both steel and concrete materials. Concrete-filled steel tube (CFST) is a type of section often used in high-rise buildings. In addition, the composite action of steel and concrete in CFST columns gives some advantages to these sections during fire incidents. On the one hand, the concrete core prevents the local buckling of the steel tube, and on the other, the steel tube prevents the spalling of concrete at elevated temperatures. The behavior of CFST sections at elevated temperatures is complicated due to interactions between the steel tube and concrete core. Therefore, achieving a correct understanding of the behavior and material properties in CFST columns is required for design and strengthening purposes.
In this research, with the help of the gene expression programming (GEP) technique, a formula was developed to estimate the ultimate load-carrying capacity of CFST columns after exposure to elevated temperatures. To that end, the experimental data of 94 groups of CFST stub columns were employed, of which 80% were used to train the model and the remaining 20% to validate the model. Input variables included the compressive strength of the concrete core ( ), cross-sectional area of the concrete core ( ), yielding stress of steel ( ), cross-sectional area of steel tube ( ), normalized temperature ( ), and the confinement index ( ). The validity of the developed model was assessed using a portion of the data that had not been employed in the training phase. To ensure the correct prediction of the ultimate load-carrying capacity of CFST stub columns by the developed model, a sensitivity analysis and parametric studies were conducted on the model and revealed the complete compatibility of the model with physical facts. The results of this research indicate that increasing the compressive strength of the concrete core, cross-sectional area of the steel tube, yield stress of steel tube, cross-sectional area of the concrete core and the confinement index increases the ultimate load-carrying capacity of the CFST section, while increasing the exposure temperature lowers this parameter.

Assessment of the condition of electrolyte disorder's and their related factors in hospitalized patients in shohada qaen medical education center

Volume 23, Issue 5 (Winter 2021)
Abstract
Background & Aim: Fluid-electrolyte balance is a dynamic process that is necessary for the continuation of life and homeostasis. Disorders in the bodychr('39')s electrolyte balance and renal dysfunction are related factors in aggravation of symptoms, mortality and length of hospital stay and treatment costs, so we decided To conduct a study by examining the status of electrolyte disorders and its related factors in patients admitted to Shohada Ghaen Educational and Medical Center.
Methods: The present study is a descriptive-analytical study that was performed by census method on all patients admitted to Shohada Ghaen Hospital in 2017. The tools used in this research included a researcher-made checklist that had 11 items that were completed by the researcher. For data analysis, descriptive statistics such as mean, standard deviation and frequency tables and chi-square test and Kruskal-Wallis. Significance level was set at (P <0.05).
Results: 873 patients with a mean age of 22.92 ± 58.42 were studied. The results showed that there was a significant relationship between electrolyte disorders and the level of education, type of disease and disease ward (P <0.05).
Conclusion: Increasing knowledge and awareness has a great effect on the prevention of electrolyte disorders. Also, due to the relationship between electrolyte disorders and the type of disease, special attention should be paid to this issue.
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