Sharif Digital Repository

In the first part, the preparation of metallic, bi-metallic (alloy or mixtures) and metallic oxide nanoparticles on the substrate of carbon nanostructures (carbon nanotube and graphene based nanosheets) has been performed using chemical and electrochemical procedures. Then, the prepared nanostructures were characterized by electron microscopy, spectroscopy and electrochemical techniques. Finally, the nanofilms have been evaluated for sensing applications as a modifier on the electrode surface for accurate determination of trace amounts of some important pharmaceutical and biological compounds. In the first work, multi-walled carbon nanotubes decorated with Fe3O4 nanoparticles... 

In this thesis, partitioning of multi inputs nonlinear dynamical systems into distinct subsystems with the goal of designing decentralized, distributed, and cooperative predictive controllers for reducing the computational load and time in practical implementations has been studied. At first, the concept of dynamical systems graph is introduced and the problem of decomposing nonlinear dynamical systems into distinct subsystems has been converted to the problem of decomposing dynamical systems graph into separate subgraphs. The proposed method for decomposition of the dynamical system graph is represented as a linear integer optimization programing where the separated subgraphs is obtained by... 

The term "data-driven" was first introduced in computer science and has entered the vocabulary of controlled engineering in recent years. So far, several classes of data-driven-control (DDC) methods have been introduced, which are identified by different names in the literature such as data-driven control, data-based control, modeless control, model-free adoptive control, iterative feedback tuning and virtual reference feedback tuning.Data-driven control includes all control theories and methods in which the controller directly and using the input-output data of the control system or knowing the processed data and without explicit knowledge of the mathematical model of the system (unlike... 

Let K, k be two fields and GK be the Galois group of separable closure of K. By a Galois representation of dimension n of GK we mean a homomorphism ρ : GK → GLn(k) of topological groups. In this thesis we want to introduce the theory of Galois representations according to the Taylor’s paper [20] which has written based on his speech in international mathematical conference (ICM 2004). In general we want to build a suitable background for the reader who wants to read the Taylor’s paper with presenting the concepts related to Galois representations such as p-adic and l-adic representations, geometric representations, modular forms, L-function of a Galois representation, Weil-Deligne... 

Due to vast use of Ametryn herbicide in agricultural and even non-agricultural activities and the possibility of contamination of carp and natural water sources by this herbicide, determination of this herbicide in surface and ground water sources is very important. Therefor introducing simple and sensitive method for determination of Ametryn is critical.
This study demonstrate a simple and sensitive colorimetric method for the detection and determination of Ametryn based on aggregation of citrate capped AuNPs. Studied method relies upon shape and distance dependent AuNPs surface plasmon resonance. By replacing the sulfide containing Ametryn herbicide with citrate molecules on AuNPs...