Browsing Department of Civil and Environmental Engineering by Title
Now showing items 143-162 of 242
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P3 - Porous Pareto Partition
(2020-02-29)Unsustainable and Misaligned Economics of Technology triggers a Porous Pareto Partition Between the Haves and the Have Nots: Can Democratization of Distributed Data act as a Catalyst for the Dissemination of Digital Dividends? -
Parameterization of Moisture and Heat Fluxes Across the Land Surface for Use in Atmospheric General Circulation Models
(Cambridge, Mass. : Ralph M. Parsons Laboratory, Hydrology and Water Resources Systems , Dept. of Civil Engineering, School of Engineering, Massachusetts Institute of Technology, 1982-06)The response of a bare soil surface to atmospheric forcing -- rain, wind, sunshine, etc. -- may be expressed in terms of the resultant evaporation rate and sensible and radiant heat losses. Examining the earth-atmosphere ... -
PEAS - Making Meaningful Sense of Sensor Data and Information
(2020-02-29)Exploring convergence of ideas to transform data into meaningful information. -
A Physically Based Channel Network and Catchment Evolution Model
(Cambridge, Mass. : Ralph M. Parsons Laboratory Hydrology and Water Resource Systems, Dept. of Civil Engineering, Massachusetts Institute of Technology, 1989-06)A catchment evolution and channel network growth model is presented. Elevations within the catchment are simulated by a sediment transport continuity equation applied over geologic time. Sediment transport may by modelled ... -
Physically-based Parameterization of Spatially Variable Soil and Vegetation Using Satellite Multispectral Data
(Cambridge, Mass. : Ralph M. Parsons Laboratory, Hydrology and Water Resource Systems, Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989-09)A stochastic-geometric landsurface reflectance model is formulated and tested for the parameterization of spatially variable vegetation and soil at subpixel scales using satellite multispectral images without ground truth. ... -
A Physiological Explanation for Vegetation Ecotones in Eastern North America
(Cambridge, Mass. : Ralph M. Parsons Laboratory, Hydrology and Water Resource Systems, Massachusetts Institute of Technology, Dept. of Civil Engineering, 1989-06)Prediction of the vegetative cover of land surfaces as climatic conditions change is an important aspect of general circulation models that has not been adequately explored. In this study, a model is developed for the ... -
Planning and Design of Agricultural Drainage under Uncertainty: A Dynamic Multi-level Approach
(Cambridge, Mass. : Ralph M. Parsons Laboratory, Hydrology and Water Resource Systems, Massachusetts Institute of Technology, Dept. of Civil Engineering, 1982-07)Drainage systems are major capital investments for irrigated agriculture. Therefore,the-goal is to install drainage systems that will be most beneficial to the agricultural economy as a whole. Planning for agricultural ... -
Porous Boundary Effects in Turbulent Shear Flow
(Cambridge, Mass. : Water Resources and Laboratory, Dept. of Civil Engineering, Massachusetts Institute of Technology, 1970-07)A technique of measuring seepage velocities is developed in order to investigate the velocity distribution in a porous boundary exposed to a turbulent shear flow. Measurements are performed in a 1.2 in. thick polyurethane ... -
A Portfolio Approach for Purchasing Systems: Impact of Switching Point
(2008-08-01)In operations management different ordering policies, such as, economic order quantity, lot for lot and periodic ordering, are used in various combinations without deeper considerations for the likely consequences on cash ... -
Potential for Improving Decision Support Catalysed by Semantic Interoperability Between Systems
(2008-07-31)Convergence of systems and intelligent automation may augment the ability of supply chain operations or healthcare networks to rapidly adapt to changes or respond, with minimal human intervention, under ideal conditions. ... -
Potential to Improve Forecasting Accuracy: Advances in Supply Chain Management
(2008-07-31)Forecasting is a necessity almost in any operation. However, the tools of forecasting are still primitive in view of the great strides made by research and the increasing abundance of data made possible by automatic ... -
The Practice of Kriging
(Cambridge, Mass. : Ralph M. Parsons Laboratory, Dept. of Civil Engineering, Massachusetts Institute of Technology, 1981-01)The theory of intrinsic random functions of order k (IRF-K) and its use in optimal linear interpolation is presented using a simple deterministic formulation. Also outlined are the procedures for identification of generalized ... -
A Precipitation Model and Its Use in Real-time River Flow Forecasting
(Cambridge, Mass. : Ralph M. Parsons Laboratory , Hydrology and Water Resources Systems, Massachusetts Institute of Technology, Dept. of Civil Engineering, 1982-07)A one-dimensional, physically based, station precipitation model is proposed and tested. The model state variable is the liquid water equivalent mass in a unit area cloud column. Model inputs are the air temperature, ... -
Prediction of Unsteady Salinity Intrusion in Estuaries: Mathematical Model and User's Manual
(Cambridge, Massachusetts : Ralph M. Parsons Laboratory for Water Resources and Hydrodynamics, Dept. of Civil Engineering, School of Engineering, Massachusetts Institute of Technology, 1972-11)Foreword: This report is intended as a documentation of the computer program and as a user's manual for the implementation of the mathematical model for the prediction of unsteady salinity intrusion in estuaries. The details ... -
A Purified Adenovirus 289-Amino-Acid ElA Protein Activates RNA Polymerase III Transcription In Vitro and Alters Transcription Factor TFIIIC
(American Society for Microbiology, 1991-10)We have previously demonstrated that a purified bacterially synthesized ElA 289-amino-acid protein is capable of stimulating transcription from the promoters of genes transcribed by RNA polymerase II in vitro (R. Spangler, ... -
Reliability of Water Distribution Systems
(Cambridge, Mass : Ralph M. Parsons Laboratory, Hydrology and Water Resource Systems, Dept. of Civil Engineering, School of Engineering, Massachusetts Institute of Technology, 1986-06)Reliability of water distribution systems is becoming of increasing concern to water system designers and operators because of the increasing age of many systems and the decreasing availability of public money for water ... -
Research Brief: A break-even hazard mitigation metric
(2017-01-12)CSHub researchers developed the Break Even Mitigation Percent (BEMP) to answer the question: “How much should be invested in mitigation for a particular building?” -
Research Brief: A Reaction-Diffusion Model to Determine Mesoscale Patterns in Cement Paste
(2018-08)Strength and toughness, two important aspects of the durability of concrete structures, are dramatically influenced by the material’s nanotexture, but the question of how the building blocks of cement paste organize ... -
Research Brief: A Resilience Assessment of Structures Using Molecular Dynamics
(2018-06)Between 1993-ˇ2012, more than 75% of catastrophic losses in the United States were caused by windstorms (1). The Congressional Budget Office estimated an average annual damage amounting to $28 billion (0.16 percent of GDP), ... -
Research Brief: Assessing Road Quality Using Crowdsourced Smartphone Measurements
(2020-07)As the demands on the nation’s roads increase, so too have road maintenance costs. To meet these challenges, agencies must vigilantly monitor road surface quality to properly apportion resources. Traditional methods of ...
