Mike Taptich mtaptich

Urban Dynamometer Driving Schedule is the standardized dynamometer test on fuel economy that represents city driving conditions for light-duty vehicles.

Intake fraction (iF) is a measurement used to describe the mass of pollution inhaled for some quantity of pollution emitted to the atmosphere. Scientists, engineers, and public health officials use this metric in the process of evaluating the exposure consequences attributable to a given emissions source.

The map above shows iF measurements for particulate matter taken from the Air Pollution Emission Experiments and Policy model. Notice that differences in proximate population density and local meteorology can produce substantial variability in iFs.

The control of contaminant migration in groundwater is a common task for environmental engineers. One way of completing this work is by installing recovery wells downstream of the chemical plume. In this visualization, I illustrate how pumping rates effect the "capture zone" of the recovery well under various groundwater flow rates. The setting assumes that the plume is contained within a confined aquifer that is 30m thick. The coordinates are a plan view of the system and the groundwater flow direction is shown via the moving circles.

A simple way to filter spatial data in d3.js using HTML5 range input slider.

Data: The greenhouse gas emissions needed to ship logs for lumber, pulping, etc. to Chicago by a combination of rail and truck freight modes. We call the spatial extent in which trade is possible given an environmental budget a freightshed. Read more about this concept, DOI: 10.1021/acs.est.5b01697.

Economic Input-Output Life Cycle Assessment (EIO-LCA) is a method to quantify the material, energy, and environmental impacts resulting from activities in our economy. The Economic Input-Output (EIO) method was first formalized by Nobel Prize winning economist, Wassily Leontief, in the 1970s. It took two decades before the computation performance of modern computers was sufficient enough to utilize this model at scale. Since the mid-1990s, EIO-LCA has been used to estimate economy-wide environmental impacts of many products and services, such as automobiles, refrigerators, computers, paper, retail trade, food systems, etc.

In this illustrative example, I model a simple economy consisting of three industrial sectors: steel, electric

A simple interface for visualizing the marginal effects on fuel combustion given a change in vehicle attributes.

A simple example of 0/1 Knapsack Problem Dynamic Programming in d3.js.

Items are first ranked according to weight. Next, at each stage (e.g., item:capacity combination) in the algorithm, the model assesses whether adding a new item (row) improves the solution at that paritcular weight capacity (column). If so, it adds the new item and updates the best solution; otherwise, it obtains the previous best solution. Click the tiles to examine each step.

Once the final solution is found, the model back calculates the optimum item set. Rows with highlighted tiles (blue) correspond to items in this set.

Note: This model purposefully shows only one solution. Can you determine when multiple solutions exist?

Particles flowing along a gradient.

Simple example of displaying a route in Leaflet using d3.js.