Browsing Doctoral Theses by Title
Now showing items 21293-21312 of 22097
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U-Pb geochronological constraints on the tectonic and thermal evolution of paleoproterozoic crust in the Grand Canyon, Arizona
(Massachusetts Institute of Technology, 1996) -
U-Th dating of lacustrine carbonates
(Massachusetts Institute of Technology, 2020)Carbonates are prevalent in many modern and ancient lacustrine settings, but reconstructions of past lake levels or environments from such materials have been hindered by poor chronology. Uranium-thorium (U-Th) dating has ... -
The U.S. global AIDS response : norms, interests and the duty to treat
(Massachusetts Institute of Technology, 2009)The dissertation seeks to explain the transformation in the response by the United States to the challenge of global AIDS. Between 1998 and 2008, U.S. spending on global AIDS increased 50-fold to over $6 billion. Most ... -
Ubik--a framework for the development of distributed organizations
(Massachusetts Institute of Technology, 1989) -
Ubiquitous Metadata: Design and Fabrication of Embedded Markers for Real-World Object Identification and Interaction
(Massachusetts Institute of Technology, 2024-02)The convergence of the physical and digital realms has ushered in a new era of immersive experiences and seamless interactions. As the boundaries between the real world and virtual environments blur and result in a "mixed ... -
UIA : a global connectivity architecture for mobile personal devices
(Massachusetts Institute of Technology, 2008)The Internet's architecture, designed in the days of large, stationary computers tended by technically savvy and accountable administrators, fails to meet the demands of the emerging ubiquitous computing era. Nontechnical ... -
An ultra low power implantable neural recording system for brain-machine interfaces
(Massachusetts Institute of Technology, 2011)In the past few decades, direct recordings from different areas of the brain have enabled scientists to gradually understand and unlock the secrets of neural coding. This scientific advancement has shown great promise for ... -
Ultra wide-bandwidth micro energy harvester
(Massachusetts Institute of Technology, 2011)An ultra wide-bandwidth resonating thin film PZT MEMS energy harvester has been designed, modeled, fabricated and tested. It harvests energy from parasitic ambient vibration at a wide range of amplitude and frequency via ... -
Ultra-cold collisions of identcial atoms
(Massachusetts Institute of Technology, 1995) -
Ultra-high precision scanning beam interference lithography and its application : spatial frequency multiplication
(Massachusetts Institute of Technology, 2008)Scanning beam interference lithography (SBIL) is a technique developed at MIT in 2003. The SBIL system, referred to as the Nanoruler, could fabricate grating patterns with around ten-nanometer phase repeatability. There ... -
An ultra-high throughput mutational spectrometer for human genetic diagnostics
(Massachusetts Institute of Technology, 2007)Discovering the genetic causes of common diseases may require scanning for mutations in all of the genes in a million people, a significant undertaking. Such discoveries would revolutionize biotechnology, potentially ... -
Ultra-high-aspect-ratio nanofluidic channels for high-throughput biological applications
(Massachusetts Institute of Technology, 2009)The development of micro/nanofluidics is expected to be the enabling technology for sample preparation of proteomic biosamples, which has been the bottleneck in proteomics. Most microfabricated nanofluidic channels, such ... -
Ultra-lightweight nanorelief networks : photopatterned microframes
(Massachusetts Institute of Technology, 2007)Lightweight nano-network structures in polymers have been fabricated and investigated for their mechanical properties. Fabrication techniques via holographic interference lithography and phase mask lithography were implemented ... -
Ultra-low energy electronics for synthetic biological sensors
(Massachusetts Institute of Technology, 2016)Advances in microelectronics have contributed to the wide availability of wearable sensor nodes for vital signs monitoring. Without additional pieces however, electronics by themselves can perform only basic detection ... -
An ultra-low voltage FFT processor using energy-aware techniques
(Massachusetts Institute of Technology, 2004)In a number of emerging applications such as wireless sensor networks, system lifetime depends on the energy efficiency of computation and communication. The key metric in such applications is the energy dissipated per ... -
Ultra-low-power circuits and systems for wearable and implantable medical devices
(Massachusetts Institute of Technology, 2013)Advances in circuits, sensors, and energy storage elements have opened up many new possibilities in the health industry. In the area of wearable devices, the miniaturization of electronics has spurred the rapid development ... -
Ultra-low-power SRAM design in high variability advanced CMOS
(Massachusetts Institute of Technology, 2009)Embedded SRAMs are a critical component in modern digital systems, and their role is preferentially increasing. As a result, SRAMs strongly impact the overall power, performance, and area, and, in order to manage these ... -
Ultra-rapid 2-D and 3-D laser microprinting of proteins
(Massachusetts Institute of Technology, 2013)When viewed under the microscope, biological tissues reveal an exquisite microarchitecture. These complex patterns arise during development, as cells interact with a multitude of chemical and mechanical cues in the surrounding ... -
Ultra-scaled III-V Vertical Tunneling Transistors
(Massachusetts Institute of Technology, 2023-06)In the quest of reducing the power consumption of transistors, charge carrier transport mechanisms other than thermionic emission over an energy barrier have received considerable attention. Among all possible mechanisms, ... -
Ultra-short nacelles for low fan pressure ratio propulsors
(Massachusetts Institute of Technology, 2014)This thesis addresses the uncharted inlet and nacelle design space for low pressure ratio fans for advanced aeroengines. A key feature in low fan pressure ratio (FPR) propulsors with short inlets and nacelles is the increased ...