75 research outputs found
Systematic front distortion and presence of consecutive fronts in a precipitation system
A new simple reaction-diffusion system is presented focusing on pattern formation phenomena as consecutive precipitation fronts and distortion of the precipitation front.The chemical system investigated here is based on the amphoteric property of aluminum hydroxide and exhibits two unique phenomena. Both the existence of consecutive precipitation fronts and distortion are reported for the first time. The precipitation patterns could be controlled by the pH field, and the distortion of the precipitation front can be practical for microtechnological applications of reaction-diffusion systems
Mintázatképződés, önszerveződés csapadékrendszerekben és a mintázatok tervezése és vezérlése mikro- és nanoskálán = Pattern formation and self-organization in precipitation systems, design and control of patterns in the micro and nanoscales
A projektben a csapadĂ©kmintázatok kĂ©pzĹ‘dĂ©sĂ©t vizsgáltuk. MintázatkĂ©pzĹ‘dĂ©s változatos tĂ©rbeli skálán mehet vĂ©gbe Ă©s a mintázatkĂ©pzĹ‘dĂ©s dinamikájának megĂ©rtĂ©sre nagyon fontos, mert ezekkel az ismeretekkel kĂĽlönleges Ă©s kĂĽlönfĂ©le tulajdonságĂş anyagot lehet tervezni az anyagtudományokban. Több technikát fejlesztettĂĽnk ki a csapadĂ©kmintázatok tervezĂ©sĂ©re Ă©s vezĂ©rlĂ©sĂ©re reakciĂł-diffĂşziĂł rendszerekben. A kifejlesztett mĂłdszerek a következĹ‘k: (i) a mintázat vezĂ©rlĂ©se elĹ‘re programozott elektromos árammal; (ii) a mintázat kontrollja oldhatĂłsági szorzat változtatásával; (iii) a mintázat kontrollja a gĂ©l struktĂşrájának változtatásával; (iv) a mintázat kontrollja mozgĂł kĂ©miai frontban; a mintázatok vezĂ©rlĂ©se pH mezĹ‘ segĂtsĂ©gĂ©vel. EzenfelĂĽl, egy Ăşj párhuzamosĂtási platformot fejlesztettĂĽnk ki videokártyák használatával CUDA környezetben. Ez az Ăşj technika hasznos lehet számos tudományos problĂ©ma numerikus megoldásának gyorsĂtásában. | During this project important aspects of the pattern formation in precipitation systems were investigated. Spontaneous pattern formation can be observed at all length scales and much effort has been devoted to gaining insight into the dynamics of theses processes because of design of special materials. We proposed and developed several techniques to control precipitation patterns in reaction-diffusion systems. The developed methods are following: (i) pattern control using predesigned electric currents; (ii) pattern control varying the precipitation threshold (solubility product); (iii) pattern control varying the gel structure; (iv) pattern control in a moving reaction front; (v) pattern control by pH field. Moreover, a new parallel computational framework has also been developed using video card with CUDA for simulation reaction-diffusion processes. This new approach can be useful to accelerate numerical simulations of the scientific problems
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