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Spin-bonding is a method for fabrication of bilayer tubes based on flow-forming process. This new method is a process with high potential in production of seamless thin-walled tubes. Utilizing this process, aluminum tube (as the inner layer or clad layer) has been bonded into steel tube (as the outer layer) to fabricate tubular laminate composites. As important parameters for creating a suitable bond, effects of thickness reduction, initial aluminum thickness and strength on bonding strength were investigated. The bond strength was evaluated by peel test and the peeled surfaces were examined using scanning electron microscopy (SEM). The results indicated that thickness reduction has great influence on strength and quality of the bond. After a threshold reduction (about 35%) the bond strength increases rapidly with the amount of deformation, until it approaches the weaker metal strength, and samples fracture from the base metal in the peel test. Approaching the strength of the two metals and decreasing the initial thickness of the clad layer, with a high amount of deformation increased the bonding strength. Fracture surface images showed that the surface fraction of bonding area was increased when deformation increased. It was also increased with the reduction of the initial thickness of the clad layer and when the strength of the two layers approached each other. Additionally, distribution and shape of the fracture area changed from a disordered fibril structure to approximately straight area, with an increase in the deformation.

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Today, paying attention to innovation in achieving economic growth and development is of great importance for researchers and policymakers. Thus, this study investigates the efficiency of the national innovation system of Iran in comparison with the countries subject to the 2046 Vision of Iran as well as China and South Korea (as two successful countries in technology catching-up policies). The study uses a two-stage Data Envelopment Analysis (DEA) over the period 2011-2016. Moreover, a Tobit model is employed to study the impact of environmental factors on the efficiency of the national innovation system. Findings indicate that Iran's national innovation system is inefficient. Although the efficiency trend in the stage of creating inventions and originalities shows a positive slope, when it enters the commercialization stage, the system operates very weekly. To increase the efficiency of the national innovation system, improving the governance indicators and university-industry collaboration are among the most effective policies proposed in this research.

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As a fighting fish and ornamental fish, the growth and color brightness of Betta fish (Betta splendens) are critical to be maintained in good conditions. Spirulina Powder (SP) from a blue-green microalga Arthrospira maxima is a nutrient source that can increase the performance of the fish. The research aimed to determine the effect of A. maxima in increasing brightness and growth in Betta fish. The experiment used a completely randomized design consisting of a control and three treatment groups with the addition of 5, 10, and 15% SP, respectively. The absolute weight, growth rate, and relative growth were assessed to evaluate the growth performance. In addition, the color brightness, blue color relative brightness, and blue chanel ratio were evaluated using image processing software. The results indicated that adding 15% SP significantly increased the growth and color brightness of Beta fish. Meanwhile, the blue-color change in fish is slightly different among all treatments. Based on this research, SP that contained carotenoids is a potential source for enhancing the color brightness of Betta fish.