Browsing Civil and Environmental Engineering - Ph.D. / Sc.D. by Title
Now showing items 477-496 of 775
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The nanogranular origin of concrete creep : a nanoindentation investigation of microstructure and fundamental properties of calcium-silicate-hydrates
(Massachusetts Institute of Technology, 2008)With an annual per capita consumption of one cubic meter, concrete is the most manufactured material on Earth. But concrete subject to sustained load creeps, like chewing gum, at a rate that deteriorates the durability and ... -
Nanomechanical coupling of mechanomutable polyelectrolytes
(Massachusetts Institute of Technology, 2012)Nanotechnology has advanced to the point where almost any molecular functional group can be introduced into a composite material system. However, emergent properties attained via the combination of arbitrary components - ... -
Nanomechanical properties of hydrated organic thin films
(Massachusetts Institute of Technology, 2007)Hydrated organic thin films are biological or synthetic molecularly thin coatings which impart a particular functionality to an underlying substrate and which have discrete water molecules associated with them. Such films ... -
NAPL (Non Aqueous Phase Liquid) source characterization based on dissolved contaminant concentrations
(Massachusetts Institute of Technology, 2000)Subsurface contamination frequently originates from spatially distributed sources of Non-Aqueous Phase Liquids (NAPLs). Such chemicals are typically persistent sources of groundwater contamination that are difficult to ... -
Natural abundance of ¹⁵N as a tool for assessing patterns of nitrogen loss from forest ecosystems
(Massachusetts Institute of Technology, 1999)Stable isotopes provide an integrated measure of the nitrogen cycling history of a site. Among ecosystems with contrasting nitrate loss patterns, the [delta]15 N of soil and plant material should be higher at sites with ... -
The natural and industrial cycling of indium in the environment
(Massachusetts Institute of Technology, 2012)Indium is an important metal whose production is increasing dramatically due to new uses in the rapidly growing electronics, photovoltaic, and LED industries. Little is known, however, about the natural or industrial cycling ... -
Natural and synthetic estrogens in wastewater treatment plant effuent and the coastal ocean
(Massachusetts Institute of Technology, 2013)Steroidal estrogens are potent endocrine disrupting chemicals that are naturally excreted by vertebrates (e.g., humans and fish) and can enter natural waters through the discharge of treated and raw sewage. Because estrogens ... -
Navigating congested cities : understanding urban mobility using new data sources
(Massachusetts Institute of Technology, 2016)Rapid urbanization and technological innovations sparked the generation of massive volumes of data that is continually improving in resolution. In particular, mobile phones, having reached penetration levels above 97% in ... -
A .net based resource sharing framework
(Massachusetts Institute of Technology, 2006)This thesis presents an Internet resource sharing architecture. It allows users to access and utilize unused computer resources, such as CPU cycles and storage, without an expert's knowledge. It achieves this by providing ... -
Network knowledge and route choice
(Massachusetts Institute of Technology, 2002)Models of urban traveler route choice are reviewed in the context of Intelligent Transportation Systems, particularly Advanced Traveler Information S ystems. Existing models suffer from assumptions of perfect information ... -
A network-based primal-dual solution methodology for the multi-commodity network flow problem
(Massachusetts Institute of Technology, 1988) -
Neural-embedded discrete choice models
(Massachusetts Institute of Technology, 2019)This dissertation is motivated by the possible value of integrating theory-based discrete choice models (DCM) and data-driven neural networks. How to benefit from the strengths of both is the overarching question. I propose ... -
A new elasto-viscoplastic model for rate-dependent behavior of clays
(Massachusetts Institute of Technology, 2016)Viscous properties of clay pertain to numerous geotechnical problems, such as excessive settlements associated with constructed fills on marine clays, or rate-dependent cyclic response of offshore foundations under wave ... -
A new electric strain gauge and its application to structural models subjected to static loads.
(Massachusetts Institute of Technology, 1945) -
The nitrogen cycle and ecohydrology of seasonally dry grasslands
(Massachusetts Institute of Technology, 2013)This thesis addresses the coupling of hydrologic and biogeochemical processes and, specifically, the organization of ecosystem traits with the water, carbon, and nitrogen cycles. Observations from a factorial irrigation- ... -
Non-linear analysis of building frames for earthquake loading.
(Massachusetts Institute of Technology, 1970) -
Non-linear behavior of steel frames.
(Massachusetts Institute of Technology, 1973) -
Non-linear consolidation around driven piles in clays
(Massachusetts Institute of Technology, 1982) -
Nondestructive evaluation of concrete using wideband microwave techniques
(Massachusetts Institute of Technology, 1995) -
Nonlinear diffraction and refraction of regular and random waves
(Massachusetts Institute of Technology, 2006)The mild-slope equation is an effective approximation for treating the combined effects of refraction and diffraction of infinitesimal water waves, for it reduces the spatial dimension of the linear boundary value problem ...
