The problems of synthesizing the beam patterns of the linear antenna array (LAA) and the circular antenna array (CAA) are addressed. First, an optimization problem is formulated for reducing the maximum sidelobe level (SLL) of the beam patterns. Then, the formulated problem is solved by using the invasive weed optimization (IWO) algorithm. Various simulations are performed to evaluate the effectiveness of the IWO algorithm for the synthesis of the beam patterns of the LAA and the CAA. The results show that IWO has a better performance in terms of the accuracy, the convergence rate, and the stability compared with other algorithms for the SLL reductions. Moreover, the electromagnetic simulation results also show that IWO achieves the best performance for the beam pattern synthesis of the antenna arrays in practical conditions.
The number of international students attending U.S. colleges and universities has increased considerably over the past decade, and the adaptation of these students is an important concern in cross-cultural research. Using survey data collected from a sample of 169 international students attending a U.S. university, this study examines the temporal patterns of students’ psychological and socio-cultural adaptation. Theresults suggest a two-phase U-curved process of psychological adaptation, with the most obvious culture shock occurring during a student’s first nine to 24 months of residence. Socio-cultural adaptation is found to increase steadily over time, without significant retreat. Interpretations, implications, and limitations of the findings are provided.
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