Sharif Digital Repository

In this project rotational barrier around the C-N bond in Ethyl N-(pipyridin carbotioate) has been studied by using DNMR spectroscopy. Spectra were taken at various temperatures , and then with simulation of bandshape broadening pattern at coalescence region, the exchange rate constant of were obtained for all temperatures. For simulation of line-shpe broadening Spinworks software was used, that with two interfaces made possible simulation with two bandshape simulator programs, DNMR and MEXICO. The rate constants obtained from the simulation were used for calculation of thermodynamic activation parameters (... 

Iran is one of the richest historic countries in the world, as extention of cultural heritage and historic building is unique. Infestation of lichens to those heritages for doing strategic actions wants the coordination of systems and organizations and universities. All the actions that do in this field, about the conservation and preservation of heritage made by stone related to architecture, be limited to lasers, electromagnetic waves, and application of jet methods such as sand storm, water jet, and prior to this mechanical and handful methods that approximately all be destructive. Application of nanoparticles of titania, as a smart photocatalytic material with antimicrobial and... 

Non-Orthogonal multiple access (NOMA) has been considered as a promising multiple access technique for the 5th generation (5G) of wireless networks. In contrast to orthogonal multiple access, NOMA supports more than one user in each subchannel and thus, improve spectral efficiency. On the other hand, energy efficiency which is another key consideration in future 5G networks, can be improved by energy harvesting (EH) methods. In the NOMA scheme, the user with the better channel condition performs successive interference cancellation (SIC) to detect the data of the user with the worse channel condition and then subtract it from the received signal to decode its own data. Since the data of the...