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Sutures, Taut Manifolds and the Topology of 3-Manifolds
, M.Sc. Thesis Sharif University of Technology ; Esfahani Zadeh, Mostafa (Supervisor)
Abstract
In this essay we focus on the question of whether a 3-manifold (possibly with bound- ary) like M supports a codimension-1 transversely oriented foliation like F , such that F is transverse to ∂M and does not have Reeb components. If such foliation exists, then ∂M is necessarily a (possibly
empty) union of tori and (based on the works of Novikov, Reeb and Rosenberg) M is either S2 × S1(with F being the prod- uct foliation) or M is irreducible. In a paper by David Gabai, which we discuss, the sufficiency of these conditions is proved in case of non-trivial second homology group.Furthermore, from the works of Thurston it is concluded that compact leaves of such foliation are norm minimizing...
empty) union of tori and (based on the works of Novikov, Reeb and Rosenberg) M is either S2 × S1(with F being the prod- uct foliation) or M is irreducible. In a paper by David Gabai, which we discuss, the sufficiency of these conditions is proved in case of non-trivial second homology group.Furthermore, from the works of Thurston it is concluded that compact leaves of such foliation are norm minimizing...
Energy and Thermoeconomic Modeling CHP System in Order to Choose between Micro-Turbine and Internal Combustion Engine as the prime Mover
, M.Sc. Thesis Sharif University of Technology ; Sattari, Surena (Supervisor)
Abstract
In this project, a co-generation system with the operation capacity of less than 1000 kilowatts has been studied. The main purpose of this project is to help decision makers in order to choose proper combination of micro turbines and/or reciprocating engines, with certain rating capacity, as the prime movers of this co-generation system. Some factors that have been considered in the decision making process are prime mover operation in various ambient temperatures, various altitudes and part-load conditions and also operational restrictions such as power to heat ratio, maintenance cost ratio and prime movers plant factor and also economic characteristics such as investment and operating cost...