Vegetable oil paints

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141861/1/aocs0513.pd

Design and Evaluation of Sensor Housing for Boundary Layer Profiling Using Multirotors

Traditional configurations for mounting Temperature–Humidity (TH) sensors on multirotor Unmanned Aerial Systems (UASs) often suffer from insufficient radiation shielding, exposure to mixed and turbulent air from propellers, and inconsistent aspiration while situated in the wake of the UAS. Descent profiles using traditional methods are unreliable (when compared to an ascent profile) due to the turbulent mixing of air by the UAS while descending into that flow field. Consequently, atmospheric boundary layer profiles that rely on such configurations are bias-prone and unreliable in certain flight patterns (such as descent). This article describes and evaluates a novel sensor housing designed to shield airborne sensors from artificial heat sources and artificial wet-bulbing while pulling air from outside the rotor wash influence. The housing is mounted above the propellers to exploit the rotor-induced pressure deficits that passively induce a high-speed laminar airflow to aspirate the sensor consistently. Our design is modular, accommodates a variety of other sensors, and would be compatible with a wide range of commercially available multirotors. Extensive flight tests conducted at altitudes up to 500m Above Ground Level (AGL) show that the housing facilitates reliable measurements of the boundary layer phenomena and is invariant in orientation to the ambient wind, even at high vertical/horizontal speeds (up to 5m/s) for the UAS. A low standard deviation of errors shows a good agreement between the ascent and descent profiles and proves our unique design is reliable for various UAS missions

Design and Evaluation of Sensor Housing for Boundary Layer Profiling Using Multirotors

Traditional configurations for mounting Temperature–Humidity (TH) sensors on multirotor Unmanned Aerial Systems (UASs) often suffer from insufficient radiation shielding, exposure to mixed and turbulent air from propellers, and inconsistent aspiration while situated in the wake of the UAS. Descent profiles using traditional methods are unreliable (when compared to an ascent profile) due to the turbulent mixing of air by the UAS while descending into that flow field. Consequently, atmospheric boundary layer profiles that rely on such configurations are bias-prone and unreliable in certain flight patterns (such as descent). This article describes and evaluates a novel sensor housing designed to shield airborne sensors from artificial heat sources and artificial wet-bulbing while pulling air from outside the rotor wash influence. The housing is mounted above the propellers to exploit the rotor-induced pressure deficits that passively induce a high-speed laminar airflow to aspirate the sensor consistently. Our design is modular, accommodates a variety of other sensors, and would be compatible with a wide range of commercially available multirotors. Extensive flight tests conducted at altitudes up to 500m Above Ground Level (AGL) show that the housing facilitates reliable measurements of the boundary layer phenomena and is invariant in orientation to the ambient wind, even at high vertical/horizontal speeds (up to 5m/s) for the UAS. A low standard deviation of errors shows a good agreement between the ascent and descent profiles and proves our unique design is reliable for various UAS missions

Nuances in Bottom-Up Interpretations: Colombia\u27s and Guatemala\u27s Radically Different Approaches to Transitional Justice

Scholars have treated “bottom-up” transitional justice processes as a non-nuanced whole, situating grassroots actors in direct opposition to large-scale, or “top-down,” approaches to transitional justice. Such an analysis is limited because it fails to take into account complex contextual factors that contribute to the ways in which bottom-up mechanisms manifest. Colombia and Guatemala are two cases in which bottom-up actors have strived to influence the ways in which peace and justice were articulated by their respective governments; however, the methods and outcomes are strikingly different. In Guatemala, grassroots actors sought to achieve ethnic inclusion, neglecting class and land-based demands. Colombia’s grassroots groups, however, have favored an anti-hegemonic approach through which bottom-up actors seek to redefine transitional justice in anti-hegemonic terms, frequently favoring radical land reform and redistribution and opposing neoliberal forms of post-conflict development. I argue that there are three primary variables influencing how bottom-up actors in Colombia and Guatemala responded to civil conflict and articulated transitional justice: 1. The ethnic nature of the conflict and the delineation of victims and perpetrators. 2. The countries’ respective access to resources 3. The role of religion (Catholic Liberation theology vs. conservative evangelism

Public Perceptions of Drones Used for Weather-Related Purposes

The CLOUDMAP Team -- Collaboration Leading Operational UAS Development for Meteorology and Atmospheric Physics. An EPSCOR grant funded by NSF Responsible Innovation & Trust Public Perception Studies to Date Some Major Findings • You can call a drone whatever you want without changing people’s support • Purpose matters • Trust matters… And More Findings • Sensemaking through pop culture, lack of knowledge, questioning, and purpose. • Hopes for societal benefits such as research technology and improved public safety (reduced risk, better forecasting). • Concerns for privacy, public & airspace safety, and pollution. • Recommendations for collaborative regulation creation for safety and security, as well as privacy. Next Steps • Studies 1&2: Wave 3 ▫ MTurk and representative sample • Study 3 Study 4 ▫ Representative sample survey experiment ▫ Varying: Purpose, actor, rural/urban ▫ Examining: Support, trust ▫ Moderation by: Knowledg

Long-Term Observation of the Adirondack Ecosystem - Data from the SUNY ESF Newcomb Campus

The Adirondack Ecological Center (AEC) at ESF’s Newcomb Campus has one of the oldest and broadest records of scientific field research in North America. Located on the Anna and Archer Huntington Wildlife Forest, AEC is a biological field station and multi-disciplinary platform for research, education and outreach where the most pressing environmental challenges facing our society can be directly examined and understood. The Newcomb Campus (www.esf.edu/newcomb) includes the AEC, Northern Forest Institute, public Adirondack Interpretive Center and Forest Operations Adirondack Properties unit. The campus’ professional staff and scientists collectively maintain extensive data archives from a century of observation. This paper provides a “road map” for researchers, students, historians and others on what resources exist and how to access them

The importance of zooplankton‐protozoan trophic couplings in Lake Michigan

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/109824/1/lno19913671335.pd

Autonomous gathering of livestock using a multi-functional sensor network platform

In this paper we develop algorithms and hardware for the autonomous gathering of cattle. We present a comparison of three different autonomous gathering algorithms that employ sound and/or electric stimuli to guide the cattle. We evaluate these algorithms in simulation by extending previous behavioral simulations for cattle. We implemented one of these algorithms and present data from experiments in which cattle were equipped with sensor nodes that allowed cueing with sound and electric stimuli. We discuss the minimum requirements for algorithms and hardware for autonomous gathering