Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 147 for “"Minimum Energy"”.
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Minimum energy path planning for ad hoc networks
… in such a way that minimizes the transmission energy used in communication. We characterize this problem and introduce two algorithms. The first is a recursive algorithm useful for problems with one communication node. We show the limitations of this algorithm and how it can find suboptimal …
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Compliant part mating and minimum energy chamfer design
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1982.
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A minimum energy solution for muscle force control during walking.
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1979.
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Desalination of brackish groundwater in the United States : minimum energy requirements
… no national assessment has been conducted on the energy costs required to make brackish groundwater potable. Because the ionic composition of groundwater varies significantly from location to location, unlike seawater, conducting site-specific analyses of the resource across the U.S. is necessary. …
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Minimum Energy Control Strategy for an Uninhabited Airship with a Moving Gondola
… a large pitch angle and of minimizing the total energy consumption required to goal position. The airship in this study is equipped with different actuation tools such as a moving gondola and a vectoring thrust, which can be used for various flight modes. The efficiency of the actuation methods …
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Insights for designing mechanochromic spiropyrans from first principles dynamics and minimum energy pathways
The energy needed for a chemical reaction usually comes in the form of heat or light, which may alter the arrangement of reactant molecules on the ground state or place them on an excited state to surmount an energy barrier. An alternative and less well-explored way of initiating a chemical …
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An energy optimal power supply for digital circuits
The energy efficiency of digital circuits continues to be a major factor in determining the size and weight of battery-operated electronics. Integration of more functionality in a single system has made battery longevity a major problem. Operating circuits at their minimum energy operating voltage …
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Design and Operation of Multi Effect Distillation- Reverse Osmosis based Hybrid Desalination Process. Modelling, Simulation and Optimisation of Design and Operation Parameters of Multi Effect Distillation and Reverse Osmosis Hybrid Desalination Processes for Producing Multi-grade Waters at Minimum Energy and Minimum Cost of Production
… based model. To deploy a sustainable source of energy, this research illustrates the combined system of MED-TVC and wind turbine with attaining a considerable reduction of specific energy consumption. Also, this research presents two novel designs of hybrid system of MED and single and double RO …
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Low energy digital circuit design using sub-threshold operation
… networks or medical applications, low energy operation is the primary concern instead of speed, with the eventual goal of harvesting energy from the environment. Sub-threshold operation offers a promising solution for ultra-low-energy applications because it often achieves the minimum …
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Reliability and energy-efficiency in wireless ad-hoc networks
… we address issues related to reliability and energy-efficiency in wireless ad hoc networks. In the first part of the work, we deal with the problem of simultaneously routing data along multiple disjoint paths from a source to destination in the most energy efficient manner. To this end, we …
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The structure of paired boson superfluids
… superfluid vortices using the Ginsburg Landau energy equation. Specifically, two types of superfluids are considered, ordinary superfluids where single bosons condense to form a strongly correlated system and superfluids where pairs of bosons condense to form a strongly correlated system while …
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Understanding Performance Limits in Wireless Sensor Networks
Finally, we study the minimum energy required for transporting packets between two arbitrarily chosen source and destination in a random wireless network. We prove both an upper bound and a lower bound of the minimum transporting energy. We also show several results of network transport capacity …
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Controlling trace impurities in a dividing wall distillation column
… such as feed composition should be examined. The minimum energy controller was not tested experimentally. A steady state model with heat transfer matching the pilot data was scaled to the size of an industrial tower and used to generate a minimum energy response surface for different vapor and …
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An analysis of quadrotor flight in the urban canopy layer
… the environment and a prevailing wind estimate. Minimum-energy trajectories are then found through the environment using an empirically derived power consumption model for a specific quadrotor platform. It is shown in simulation that a minimum-energy planner aware of the wind field outperforms a …
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Roles of surface interaction on Cryptosporidium parvum oocyst transport in subsurface environment
… observed to be entrapped in the DLVO secondary minimum energy well. The results illustrated that attachment in secondary minimum energy well was reversible and oocysts were either resuspended due to hydrodynamic forces or transferred to more stable primary minimum energy well. Distribution of …
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Improving energy efficiency in a pharmaceutical manufacturing environment -- production facility
… of a pharmaceutical company in Singapore had low energy efficiency in both its office buildings and production facilities. Heating, Ventilation and Air-Conditioning (HVAC) system was identified to be the major energy consumer in the plant. An HVAC specific energy management tool was developed to …
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Exploring the effect of a potential barrier on the molecular rotation-vibration structure
… C̃̃ state and the acetylene (HCCH) Ã state. The minimum-energy geometry of both electronically excited states is qualitatively different from their respective electronic ground state geometry. The SO₂ C state exhibits a barrier (~100 cm-¹) at the C₂u, geometry along the antisymmetric-stretching …
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Interconnect modeling and optimization in deep sub-micron technologies
… transmission speed perspective. A model for the energy consumption associated with data transmission through deep sub-micron technology buses is derived. The capacitive and inductive coupling between the bus lines as well as the distributed nature of the wires is taken into account. The model is …
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Long-duration proximity operations flexibly optimized for efficient inspection and servicing using free-orbit dynamics
… is presented for developing and analyzing fuel-, energy-, and time-optimal trajectories with multiple phases using Gauss pseudospectral collocation software. Emphasis is placed on energy efficiency during inspection, for which accurate dynamical models play a critical role in formationkeeping fuel …
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Cooperative routing in wireless networks
In this thesis, we study the problem of energy efficiency and reliability in wireless ad-hoc networks. First, we introduce the idea of wireless cooperation advantage. We formulate the problem of finding the minimum energy cooperative route for a wireless network under idealized channel and receiver …
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