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Various thermo mechanical processes have been studied to improve the mechanical properties of 18Ni-Co-Mo steels. In this work, the effect of interpass aneal time on the mechanical properties of the 18Ni-Co-Mo steel was investigated, using the rolling experiments. Hot rolling process was performed in two passes. The reduction of area was 30% in the first pass at 1100 °C. After first pass specimens were air cooled to second pass temperature (900°C) and held for various interpass time (2 sec, 5 min and 10 min). The second pass was performed at 900°C for 20% reduction of area. After that, the specimens were directly water quenched to retain the microstructure present at the second pass. Tensile and charpy tests samples were machined from hot rolled specimens. The results showed that grain size was decreased significantly at these conditions by increasing the interpass time from 2 sec to 5 min. This was attributed to the static recrystallization. With an increase in interpass time to 5 min, tensile strength was increased, without significant change in charpy impact energy. Increasing the interpass time from 5 to 10 min, increased austenite grain size. This was attributed to the grain growth. The results indicated that the interpass time of 5 min can be considered to obtain the maximum tensile strength.

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Comparative study of critical theories of contemporary Arab and Iranian poets can have a unique part in literary analysis. In general, new poetic critical theories are under the influence of the intellectual origins of contemporary German and French philosophies. Adonis and Shafiei Kadkani are two influential critic poets who have discussed poetic concepts and components in their critical articles and books with specific tact. The present study was a descriptive-analytical investigation into analyzing critical views of these two poets based on American school of comparative approach in the fields of definition of poetry, and language and music of poetry. The results of the study showed that the two critics have common intellectual foundations; therefore, they have some similar critical viewpoints. However, their critical approaches are different in terms of both methodology and intellectual depth. Compared to Shafiei Kadkani, Adonis has a deeper, more organized, and more daring view toward poetic categories and poetic language.

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The purpose of this paper is a qualitative evaluation of the mechanical properties of titanium aluminum nitride (TiAlN) hard nanostructured coatings applied on cutting tools using X-ray diffraction (XRD). Deposition of TiAlN and TiN nanostructured coatings were carried out by a pulse DC plasma-assisted vapor deposition (DC-PACVD) and a high power impulse magnetron sputtering (HIPIMS) machines. At first, for enhancement the adhesion of TiAlN nanostructured coating on the steel substrate, TiN inter-layer was deposited for the all samples. Nano-indentation, micro-hardness tester, and field emission scanning electron microscope (FE-SEM) were used in order to measured and compare the qualitative results with the real and experimental values. The results indicate that XRD pattern and their analysis can be a suitable qualitative method to evaluate the mechanical properties of the coatings. The lattice parameter, micro-strain, residual stress, texture coefficient, the crystal grain size and density of dislocation are used to demonstrate the relationship between the mechanical properties of the coatings and the XRD patterns. As a result, this method can be used as non-destructive and inexpensive method for quantitative comparison and evaluation of mechanical properties of thin film materials.

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In this work, joining of 4014 Aluminum tube to 7075 rod is studied using magnetic pulse welding process. The effect of impact angle (4, 6 and 8 degrees) and welding voltage (6 and 7 kV) on the joint are investigated. The microstructure of the weld cross section was evaluated using optical and scanning electron microscopy and mechanical properties of the welds were evaluated by microhardness and tensile tests. The results showed that, for the impact angles of 4 and 6º, the increase of welding voltage from 6 to 7 kV, leads to the change morphology of interfacial from straight to wavy. While, for the impact angle of 8º, the increase of the welding voltage increases local melting and results in the degradation of the interface. At the same angle, increasing the welding voltage increases the hardness due to the higher work hardening and severe plastic deformation. On the other hand, the effect of welding voltage on the hardness is dominant compared to the impact angle. The results of the tensile test showed that, for the low impact angles, increasing the welding voltage increases the shear strength, while, for the higher impact angles, it decreases the shear strength because of creating holes in welding interface. The results showed that joining of aluminum tube/rod with impact angle of 6º and welding voltage of 7 kV leads in uniform and wavy interface with higher shear strength in comparison with other conditions.

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Extension and educational programs use various measures to advise farmers on adapting to climate change. Satisfaction with these programs is a tool to study their effectiveness. In this respect, studying the factors influencing satisfaction with extension and educational programs can help planners and policymakers of the agricultural sector in general, and agricultural extension in particular, to improve the quality of these programs. Therefore, the present paper explores the factors influencing satisfaction and loyalty in extension and educational programs. The statistical population was composed of all participants of these programs in Fars Province, Iran. A total of 150 participants was estimated as the sample size. Participants were selected through random sampling. Data collected from the participants were analyzed by structural equation modeling. The results showed that the research variables had optimal validity and reliability. The variables of appropriate extension packages and perceived value were among the most important factors dictating satisfaction with extension and educational programs. In addition to these two variables, other factors including image, emotions, perceived economic return, and tangibles of the educational programs had direct impacts on satisfaction and indirect impacts on loyalty to these programs. Research findings can help farmers to adapt to climate change.