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dspace.mit.edu 檢索結果共 84617 筆,本頁資料從第 37 筆到第 48 筆

To optimize survival, organisms must be able to learn contingencies between external stimuli and rewards and appropriately respond to these associations. Deficits in reward-related learning or reward-seeking are thought to occur in a host of psychopathologies, including depression (Drevets, 2001), eating disorders (Wagner et al., 2007), and substance abuse (Wrase et al.....

By Christine Eckhardt--Massachusetts Institute of Technology--2016-01-15
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Organisms have a remarkable ability to respond to complex sensory inputs with intricate, tuned motor patterns. How does the brain organize and tune these motor responses, and are certain circuit architectures, or connectivity patterns, optimally suited for certain sensorimotor applications? This thesis presents progress towards this particular problem in three subprojec....

By Michael (Michael Benjamin) Lynn--Massachusetts Institute of Technology--2016-01-15
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This thesis describes the design and development of new methods to functionalize graphitic materials as well as the synthesis and properties of a new triptycene poly(arylether), triptycene- PEEK (Trp-PEEK) and its derivatives. In chapters 1-3, the development of new methods to functionalize graphitic materials with both small molecule functional groups and polymers and ....

By John B. (John Benjamin) Goods--Massachusetts Institute of Technology--2016-01-15
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The technology of modem purely electrical computers requires more electrical wiring for intra-chip and inter-chip communications as the number of cores increases. Consequently, energy consumption increases due to heat dissipation from low bandwidth electric wires. The conversion of electrical signals to optical signals has been proposed in the future electro-optical com....

By Stevan Lj Uros̆ević--Massachusetts Institute of Technology--2016-01-15
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Optical Flow Switching (OFS) that employs agile end-to-end lightpath switching for users with large transactions has been shown to be cost-effective and energy-efficient. However, whether it is possible to coordinate lightpath switching and scheduling at a global scale on a per-session basis, and how the control plane and data plane performance correlate remained un-ans....

By Lei Zhang--Massachusetts Institute of Technology--2016-01-15
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Solar panels are not installed on an off-grid farm to save on home energy bills. Those systems are installed to enable communities to do activities that they could not do before. This thesis studies the application of design for value to distributed solar energy systems by considering how the energy system will enable new income generating activities. The work here coup....

By Kevin Patrick Simon--Massachusetts Institute of Technology--2016-01-15
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We describe the development of a new type of robotic underwater vehicle designed specifically for the inspection of critical infrastructures such as boiling water reactor nuclear power plants. These applications require vehicles that can access confined areas, maneuver precisely, and move easily in several directions. In addition, external appendages such as fins or pro....

By Anirban Mazumdar--Massachusetts Institute of Technology--2016-01-15
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irrigation on small-scale farms (~ 1 acre) in Eastern India. The pump is part of a larger irrigation system powered by 300 watts of solar panels and includes batteries as an energy buffer. The pump was designed for and achieved a performance point of 13 gal/min and a pressure head of 1 bar and surpassed the efficiency of every other pump of its kind currently on the mar....

By Marcos A Esparza--Massachusetts Institute of Technology--2016-01-15
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Using a desktop scale analog for the injection of a thin rod into a horizontal pipe to service wellbores in the oil industry, we perform an experimental investigation of the effect of rotating a thin rod as it undergoes on-off injection into a cylindrical constraint. When a thin rod is injected into a cylindrical constraint, the force required to continue injection incr....

By Ryan A McDermott--Massachusetts Institute of Technology--2016-01-15
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In this thesis, we designed and implemented a machine to dispense and collect helmets for bike-share programs such as Boston's Hubway. Design of the machine was guided under several constraints including size and power for tight integration with existing bikeshare stations. The machine itself is divided into subsystems, including dispensing, reloading, and return compon....

By Arni Aleksi Lehto,Charles Christopher Mills--Massachusetts Institute of Technology--2016-01-15
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A process and physical system were developed to manufacture pharmaceutical tablets through an electrospinning operation and subsequent compaction. Theoretical simulations of the electrospinning were run to predict physical system performance, and a proof-of-concept device was designed, produced and tested. The process was demonstrated to be theoretically scalable to lev....

By Nicholas Matti Sondej--Massachusetts Institute of Technology--2016-01-15
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Car air conditioning systems cool the entire cabin, which is inefficient, as only the air surrounding the passengers needs to be cooled to realize a similar effect. These air conditioning units draw large amounts of power, enough to be detrimental to fuel efficiency. This presents problems for cars with smaller engines and electric cars that lack the battery capacity to....

By John (John Keeler) Queeney--Massachusetts Institute of Technology--2016-01-15
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