توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Image Encryption Using Tent Chaotic Map and Arnold Cat Map
نویسنده(ها): ،
اطلاعات انتشار: International Journal Information and Communication Technology Research، چهارم،شماره۳، Jun ۲۰۱۲، سال
تعداد صفحات: ۸
In this paper, a new algorithm for image encryption using chaotic tent map and Arnold cat map is proposed. This algorithm consists of two major phases, permutation and substitution. In the permutation phase, Arnold cat transform is used. A pseudo random image is produced using the chaotic tent map. In the substitution phase, the permuted image is Exclusively ORed to this pseudo random image in order to generate encrypted images. A computer simulation is used to evaluate the proposed algorithm and to compare its results to encrypted images of other methods. The criteria for these comparisons are chi–square test of histogram, correlation coefficients of pixels, NPCR (number of pixel change rate), UACI (unified average changing intensity), MSE (mean square error) and MAE (mean absolute error). These comparisons show that the proposed chaotic image encryption method has a high performance and security.

۲Structural, Optical and Ultra–Violet Photodetection Properties of ZnO Nanorods with Various Aspect Ratios
نویسنده(ها): ، ،
اطلاعات انتشار: journal of advanced materials and processing، چهارم،شماره۳، ۲۰۱۶، سال
تعداد صفحات: ۹
ZnO nanorods with various lengths were synthesized by a two–stage route (by changing the time of growth between 0–240 min) and were characterized using XRD, SEM, UV–Vis and PL techniques. The SEM and XRD results confirmed a fast growth of (0 0 2) plane in the preferential longitudinal orientation, in contrast to lateral growth and therefore, by increasing the time of hydrothermal growth, nanorods with higher aspect ratios are obtained. Naturally, by increasing the length of nanorods, not only the average transmittance in both near ultraviolet and visible ranges is decreased, but also the PL peaks are red–shifted and extinct. Finally, ultra–violet photodetection of the samples shows that higher active surface area (with respect to the time of growth) is appropriate for photo–induced interactions leading to higher UV–sensitivity.
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