ScholarWorks@UMassAmherst

Recent Submissions

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    Code and Sample Data for "Mesoscale Polymer Ribbon Arrays: High Aspect Ratio Surface Structures and their Digital Reconstruction"
    (2024-07-11) Moed, Demi E.; Dimitriyev, Michael S.; Greenvall, Benjamin R.; Grason, Gregory M.; Crosby, Alfred J.
    Mesoscale polymer ribbon arrays are high aspect ratio surface structures that exhibit unique three-dimensional morphologies in aqueous environments. To better correlate the impact of processing and aging on the morphology of these and similar high-aspect ratio surface structures, we have developed a MATLAB code capable of extracting quantitative morphological descriptors from 3D confocal microscopy data. This code was used to produce the results outlined in “Mesoscale Polymer Arrays: High Aspect Ratio Surface Structures and Their Digital Reconstruction.” In addition to this code, we have included instructions for data processing and four test datasets. This process first skeletonizes .tif stacks obtained via confocal microscopy. It then builds a model of individual ribbon positions in 3D space. Finally, it calculates key quantitative morphological descriptors such as the radius of curvature and end-to-end distance of these high aspect ratio structures.
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    A Category of Sample Spaces
    (1971) Collins, Walter Robert
  • Publication
    Consistency Among States in Evaluating the Risk of Nonnative Plants
    (2021) Kesler, Ben
    Invasive plants are non-native species that have self-sustaining populations, are spreading into natural areas, and have negative impacts on native ecosystems. An invasive plant that invades one state could quickly spread to surrounding states, so communication and collaboration between multiple states are needed to reduce risk from plant invasions in the U.S. Variations in weed risk assessments (WRAs) used for different states, however, may hinder consistency if WRAs produce different outcomes about which species are invasive. Additionally, it is more effective to prevent a species from becoming widespread than to manage an already-widespread species, so evaluating and regulating invasive species proactively (before they become widespread) would reduce later control costs. Evaluating new, range-shifting invasive species could lead to proactive regulation in light of climate change, but climate change is rarely considered explicitly in existing WRAs. Here, I assessed the consistency of state WRAs to one another as well as whether WRAs can account for range-shifting species proactively. I compared each state’s WRA to the standards laid out by Roy et al. (2018). My analysis determined whether WRAs for 30 states assess similar risk criteria and whether they have the flexibility to potentially incorporate climate change. Species’ spread, impacts, and potential distribution were included in all WRAs whereas species’ native range, introduction pathways, and potential effects in light of climate change were included in less than ten WRAs. Ten out of the 27 states that did not explicitly consider climate change in their WRAs could provide guidance that enables its consideration.
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    Transit Oriented Development Plan for Palmer, MA
    (2023-04-01) Benoit, Keith
    The purpose of this project is to create a Transit Oriented Development (TOD) plan for Palmer, Massachusetts based on scholarly and professional literature, site visits and a review of case-studies. It begins with a definition of TOD, describes the best TOD practices, analysis of obstacles related to TOD and measures of success. It then moves to a description of the possible TOD site in Palmer and creates an implementation strategy for the town. Palmer was included in the MassDOT East-West Passenger Rail study, that investigated putting a commuter rail stop in the town as part of the extension of the Massachusetts Bay Transit Authority (MBTA) Framingham/Worcester Line, connecting Palmer to Worcester, Boston, Springfield, and New York via rail. Transit Oriented Development has the potential to create the elements that increase the use of transit and capture more of the economic activity generated in the TOD zone.
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    Source Data for: Thermal preconditioning of membrane stress to control the shapes of ultrathin crystals.
    (University of Massachusetts Amherst, 2024) Wan, Hao; Jeon, Geunwoong; Grason, Gregory M.; Santore, Maria M.