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A Framework For New Generation Transportation Simulation, Daiheng Ni
A Framework For New Generation Transportation Simulation, Daiheng Ni
Daiheng Ni
This paper discussed the evolution and future trend of simulation in general domain and in transportation. Some challenges facing transportation modeling and simulation were identified. As an effort to address these challenges, a framework of new generation transportation simulation was developed. The framework is envisioned to be multi- scale in resolution, parallel in execution, and driven by ob- jects. The paper further discussed strategies of transporta- tion simulation at a nanoscopic level which offers a level of modeling detail beyond the state-of-the-art.
Characterization Of Manganese Oxide Coated Filter Media, Joseph Goodwill
Characterization Of Manganese Oxide Coated Filter Media, Joseph Goodwill
Environmental & Water Resources Engineering Masters Projects
Abstract Several methods for removal of soluble maugauese from drinking water exist. One of these options involves adsorption of the maugauese onto Mn oxide coated filter media. Dissolved maugauese (Mn(H)) is adsorbed to sites on the Mn oxide coating aud then oxidized by free chlorine, thus regenerating the media sites for further Mn adsorption. This method has been successfully used by numerous water treatment plauts, decreasing Mn levels to below treatment goals. A disadvautage to this method is the use of chlorine prior to filtration, which cau lead to increased levels of disinfection by-products as compared to post-filter chlorination. Nine …
Impact Of Chloramines On Disinfection By-Products In Selected Surface Water Supplies, Allan P. Briggs
Impact Of Chloramines On Disinfection By-Products In Selected Surface Water Supplies, Allan P. Briggs
Environmental & Water Resources Engineering Masters Projects
Aquarion Water Company (AWC) of Connecticut owns and operates the Warner, Stamford and Dean's Mill drinking water treatment plants among several other facilities. Bench-scale experiments were conducted to evaluate the impact of secondary disinfection with chloramines on disinfectant by-products (DBP) for these three supplies. The goal was to determine if a significant decrease in DBP formation could be achieved. The final Stage 2 Disinfectants and Disinfection By-Products (DDBP) Rule has prompted A WC to investigate strategies that can help decrease DBP formation in their finished and distributed water. The Stage 2 DDPB Rule regulates two classes of DBPs, the four …
The Relationship Between Pre-Filter Chlorine Addition And Enhanced Disinfection Byproduct Formation, Melissa Brown
The Relationship Between Pre-Filter Chlorine Addition And Enhanced Disinfection Byproduct Formation, Melissa Brown
Environmental & Water Resources Engineering Masters Projects
In this work, the issue of how pre-filter chlorination of drinking water causes an increase in disinfection byproduct (DBP) formation is examined. Chlorination and granular media filtration are two widely used practices in drinking water treatment. It is also common to apply chlorine ahead of the filters. However, this has been shown to elevate disinfection byproducts (DBP) levels. Experiments were performed at full- and bench-scale using filter influent and effluent from working filters and several anthracite/sand filter columns operated in parallel. The filter influent for the bench-scale experiments was clarified water from the Warner Water Treatment Plant operated by the …
Performance Evaluation Of Appropriate In-Home Drinking Water Treatment Options For Developing Countries, Bree Carlson
Performance Evaluation Of Appropriate In-Home Drinking Water Treatment Options For Developing Countries, Bree Carlson
Environmental & Water Resources Engineering Masters Projects
Globally, over one billion people do not have access to safe drinking water. The majority of these people live in developing nations, where large-scale drinking water treatment projects may not provide a viable solution because of a lack of skilled laborers, consistent and reliable electricity, materials, sufficient economic capital, and/or fuel sources. Appropriate non-conventional drinking water treatment technologies may provide a solution to these problems, particularly if such technologies are composed of materials readily accessible to the population. Three treatment technologies whose materials are easily acquired throughout the developed and developing world are sari filtration, solar disinfection, and citrus fruit …
Application Of Microbial Source Tracking To Separate Microbial Sources To A Tributary Of The Wachusett Reservoir, Michael N. Tache
Application Of Microbial Source Tracking To Separate Microbial Sources To A Tributary Of The Wachusett Reservoir, Michael N. Tache
Environmental & Water Resources Engineering Masters Projects
Surface waters used as sources of drinking water can be at risk for pathogen contamination from non-point source pollution. Non-point source pollution is a problem because it can be difficult to detect and quantify. Source water protection is a tool to protect public health by maintaining and improving source water quality. The Long Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR), which aims to improve the control of Cryptosporidium, recognizes watershed protection programs as part of both Cryptosporidium and virus removal requirements. Microbial source tracking (MST) is a tool that is currently being developed to aid in source water protection. …
The Suitability Of Coliphage As An Indicator Of Potential Fecal Contamination In Groundwater Systems, Keith G. Dewar
The Suitability Of Coliphage As An Indicator Of Potential Fecal Contamination In Groundwater Systems, Keith G. Dewar
Environmental & Water Resources Engineering Masters Projects
Over the years aquifers have been considered a clean source of drinking water as the soil acts as a natural filter. It.has been realized that groundwater used as a source of drinking water can be subject to fecal contamination through a number of various sources. With almost half of the United States national domestic water supply originatng from groundwater, a system of monitoring for contamination should be implemented to ensure public health and safety. Monitoring water to assess its microbial safety has long relied on the detection of indicator microorganisms, total and fecal coliforms in particular. Coliform bacteria has exhibited …
Direct Methods Of Determining Traffic Stream Characteristics By Definition, John D. Leonard, Daiheng Ni
Direct Methods Of Determining Traffic Stream Characteristics By Definition, John D. Leonard, Daiheng Ni
Daiheng Ni
There are generally two approaches to derive traffic stream characteristic s (i.e. flow, space mean speed, and density): indirect approach which derives traffic stream characteristics by estimation from correlated variable(s) and direct approach which determines traffic stream characteristics by definition from field observations. A method of the former approach inevitably involves estimation error while a method of the latter provides “the ground truth”. This paper examines and contrasts three direct methods, namely the HCM method, the x-t method, and the n-t method. The HCM method determines traffic stream characteristics based on their definition adopted by Highway Capacity Manual (HCM). The …