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The flutter of a composite wing reinforced with functionally graded carbon nanotubes (CNTs) has been investigated. A rectangular plate models a supersonic wing with cantilever boundary conditions. To determine displacement fields of a moderately thick plate, shear deformation theory is used. Using the Hamilton principle, a first-order piston theory was used to simulate supersonic airflow. This study examines four types of CNT thickness. Also, four different CNT distribution patterns are investigated. In a two-layer asymmetric composite, the effects of patch mass, mass distribution, fiber orientation angle, and distribution of CNTs were examined. Moreover, the results are compared and verified with other studies. A greater mass ratio led to a smaller flutter boundary, while a longer added mass increased the flutter boundary. A variation in the distribution pattern in CNT fiber orientation results in a distinct behavior of the flutter boundary for asymmetric composites with increasing orientation angles. The artificial neural network is utilized to predict the damping ratio, and the results showed great accuracy compared to the study results. Hyperparameter tuning is employed for better optimizing the predictive models.

In this research paper, interference fit was studied in order to verify the change in the thickness of the models used, as well as the value of the interference fit ratio, and to study its effect on the fatigue phenomenon. Three variables were taken for the thickness of the board: 2, 4, and 6 mm, and three ratios of interference fit: 1.5, 2.4, and 4.7, to see its effect on the phenomenon of fatigue. As the results showed, high pressure is required for the process to pass the pin inside the hole. The deformation value increases with the thickness of the sample. The ANSYS program was used for the purpose of simulation. High pressure is required for the pin to pass inside the hole. The deformation value increases with the thickness of the sample. The highest stress value is 0.063mm, which is the highest value compared to other solutions. It is necessary to obtain results that represent the trajectory on the three axes of the mouth of the pin. The interference fit's pressures and deformations must be used to get findings that depict the route along the mouth's three axes. Changes in the route indicated by the edge of the sample along its length to the center of the pin result in x-axis deformations; it is evident that when the interference fit becomes tighter, the deformation value also rises. In the scenario where the ratio fits 4.7%, deformation has reached 0.1mm, which is the largest amount compared to other instances. The maximum stress value of any known solution is 3.7 GPa. The value of the stresses on the y axis varies throughout the track and rises at the second-third of the axis track length. The deformation value in the situation when the ratio fits 4.7 percent has reached 0.27mm, which is the largest value. [ABSTRACT FROM AUTHOR]

The present experiment was conducted to estimate the effect of adding different levels of Annatto seeds (Bixa orellana) (BO) to the laying chicken diets as antioxidants on oxidation indicators in the egg yolk. Two hundred forty, ISA Brown laying hensat the age of 67-week-old(producing brown eggshell) were employed in this experiment. The hens were weighed individually and the hens with weights above and below the standard weights (± 10) wereexcludedaccording to the index of producing company (ACE Brown standard index), randomly and homogeneously distributed into four treatments by three replicates per treatment (20 hens per replicate). The experimental treatments included: T1 basal diet as control, T2 basal diet +1% of the BO powder, T3basal diet + 2% of the BO seed powder, T4 basal diet + 3% of the BO seed powder. The obtained results of the present study indicated that adding 1, 2, 3% of BO seed powder to the diet resulted in a significant difference (P <0.05) between treatments T2, T3 and T4 compared to T1in the oxidation indicators and for all periods of the experiment. The lowest ratio was observed in T4 with a decrease in the levels of free fatty acids (FFA), peroxidevalue (PV) and the amount of dehydrogenate (TBA). It can be concluded that adding Annatto seed powder (BO) seed powder at levels of 1, 2, and 3% to laying chicken diets improved oxidation indicators in the egg yolk. [ABSTRACT FROM AUTHOR]