3,986 research outputs found

    Spelling Errors and Social Media Outrage: On the Conservative Party of Canada's Error-Ridden Pamphlet

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    After Elections Canada announced the 2021 Canadian Federal Election in August of the same year, the political parties implemented their campaign strategies. Amongst social media and doorknocking campaigns, one document released by the Conservative Party of Canada attracted attention online due to excessive spelling errors. To better understand whether this mailer was an error or intentional, this paper explores the CPC’s larger social media campaign and the strategic patterns used historically by their marketing company to provide more context to why something as simple as spelling errors can be a piece of effective campaigning. By understanding the firehose of outrage-inducing content implemented by the CPC in the 2021 election, this paper concludes that the spelling errors were part of an intentional plan to build outrage and stoke further divide between Canada’s increasingly polarized political parties

    Resource management implications of ERTS-1 data to Ohio

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    Initial experimental analysis of ERTS-1 imagery has demonstrated that remote sensing from space is a means of delineating and inventorying Ohio's strip-mined areas, detecting power plant smoke plumes, and proving the data necessary for periodically compiling land use maps for the entire state. The nature and extent of these problems throughout Ohio, how ERTS data can contribute to their solution, and estimates of the long term significance of these initial findings to overall resource management interests in Ohio are summarized

    Study of quiet turbofan STOL aircraft for short haul transportation

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    Conceptual designs of Quiet Turbofan STOL Short-Haul Transport Aircraft for the mid-1980 time period are developed and analyzed to determine their technical, operational, and economic feasibility. A matrix of aircraft using various high-lift systems and design parameters are considered. Variations in aircraft characteristics, airport geometry and location, and operational techniques are analyzed systematically to determine their effects on the market, operating economics, and community acceptance. In these studies, the total systems approach is considered to be critically important in analyzing the potential of STOL aircraft to reduce noise pollution and alleviate the increasing air corridor and airport congestion

    Application of aircraft navigation sensors to enhanced vision systems

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    In this presentation, the applicability of various aircraft navigation sensors to enhanced vision system design is discussed. First, the accuracy requirements of the FAA for precision landing systems are presented, followed by the current navigation systems and their characteristics. These systems include Instrument Landing System (ILS), Microwave Landing System (MLS), Inertial Navigation, Altimetry, and Global Positioning System (GPS). Finally, the use of navigation system data to improve enhanced vision systems is discussed. These applications include radar image rectification, motion compensation, and image registration

    Estimation of Time-Varying Pilot Model Parameters

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    Human control behavior is rarely completely stationary over time due to fatigue or loss of attention. In addition, there are many control tasks for which human operators need to adapt their control strategy to vehicle dynamics that vary in time. In previous studies on the identification of time-varying pilot control behavior wavelets were used to estimate the time-varying frequency response functions. However, the estimation of time-varying pilot model parameters was not considered. Estimating these parameters can be a valuable tool for the quantification of different aspects of human time-varying manual control. This paper presents two methods for the estimation of time-varying pilot model parameters, a two-step method using wavelets and a windowed maximum likelihood estimation method. The methods are evaluated using simulations of a closed-loop control task with time-varying pilot equalization and vehicle dynamics. Simulations are performed with and without remnant. Both methods give accurate results when no pilot remnant is present. The wavelet transform is very sensitive to measurement noise, resulting in inaccurate parameter estimates when considerable pilot remnant is present. Maximum likelihood estimation is less sensitive to pilot remnant, but cannot detect fast changes in pilot control behavior

    Me and We: God\u27s New Social Gospel

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    A review of a book by Leonard Sweet that attempts to redefine the old social gospel into a new social gospel that is more evangelical in nature than the recent social justice movement

    Hybrid TiO2 Solar Cells Produced from Aerosolized Nanoparticles of Water-Soluble Polythiophene Electron Donor Layer

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    Hybrid solar cells (HSCs) with water soluble polythiophene sodium poly[2-(3-thienyl)-ethyloxy-4-butylsulfonate] (PTEBS) thin films produced using electrospray deposition (ESD) were fabricated, tested, and modeled and compared to devices produced using conventional spin coating. A single device structure of FTO/TiO2/PTEBS/Au was used to study the effects of ESD of the PTEBS layer on device performance. ESD was found to increase the short circuit current density (Jsc) by a factor of 2 while decreasing the open circuit voltage (Voc) by half compared to spin coated PTEBS films. Comparable efficiencies of 0.009% were achieved from both device construction types. Current-voltage curves were modeled using the characteristic solar cell equation and showed a similar increase in generated photocurrent with an increase by two orders of magnitude in the saturation current in devices from ESD films. Increases in Jsc are attributed to an increase in the interfacial contact area between the TiO2 and PTEBS layers, while decreases in Voc are attributed to incomplete film formation from ESD

    Assessment of Sediment Contamination in Casco Bay

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    EXECUTIVE SUMMARY Contaminant concentrations of sediment samples collected approximately 10 years apart are compared in an attempt to establish current status of contaminant concentrations in Casco Bay, to determine whether contaminant concentrations are increasing, decreasing or remain unchanged, and to examine any changes in the geographical distribution of contaminants. This process is complicated by the potential of re-suspension of older sediment back to the surface, the non-homogeneity of sediments, low concentrations for some analytes and variability of different analytical methods. In spite of these complications several trends are observed. As expected, most of the contaminants appear to be decreasing in concentrations. Total PAH concentrations in the sediment are an exception. When comparing total PAH concentration in 1991 and 2001, there is neither an increase nor a decrease when the analytical uncertainties are considered. The continuing increased use of fossil fuels that may add additional PAH to the sediments appears to be balanced by increasing controls that lower PAH inputs. Total pesticides as well as 4,4-DDE, 4,4-DDD and total DDTs indicate a decrease from 1991 to 2000/2001. Total PCB concentrations also suggest a decrease over this time period. Silver is the only trace element increasing in concentration at most sampling sites from 1991 to 2001. The reason for this difference is not clear. Concentrations decreased at the majority of the sampling sites for cadmium, chromium, mercury, nickel, and selenium with no apparent difference for arsenic, copper lead and zinc. Tributyltin and total butyltin concentrations decreased over the time period from 1994 to 2000/2001. The overall indication for dioxin/furans is no change between sampling periods. The planar PCB indicates no change (PCB 77) or decreasing concentrations (PCB 126). With the many complicating factors, the interpretation of these data needs to be done with care. There is no indication from these data that any of the contaminants measured has increased by more than a factor of 2. At most Casco Bay sites and for most analytes there is either no change or a decrease. There are sites where increases are apparent and many of these sites are at the shallow water sites or at the Inner Bay sites where concentrations are higher and new inputs are more likely Sediments from the Inner Bay region of Casco Bay; closest to Portland, ME; contain the highest levels of trace metals, PCBs, DDTs, and chlordane. For contaminants other than PAH (and these only at a few locations) and PCBs at one location, the levels of contamination in Casco Bay would not be considered high on a national basis, based on Macauley et al. (1994). The geographical distribution of most contaminants remains similar to those determined in 1991/1994. There are generally higher contaminant concentrations in the vicinity of Portland and other populated and industrial areas. Toxicity tests for selected sites and comparison of 2 contamination concentrations to ERL or ERM indicate the sediments are not toxic. The overall conclusion based on the available data is that the contaminant loading for Casco Bay, as a whole, is decreasing or remaining the same and these concentrations are not likely to adversely affect the biota. The geographic distribution of sediment contaminants is generally confirmed in the analysis of mussel tissue by the Casco Bay Estuary Project and the Maine Department of Environmental Protection (DEP) (Doggett, DEP, personal communication)

    Identification of Time-Varying Pilot Control Behavior in Multi-Axis Control Tasks

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    Recent developments in fly-by-wire control architectures for rotorcraft have introduced new interest in the identification of time-varying pilot control behavior in multi-axis control tasks. In this paper a maximum likelihood estimation method is used to estimate the parameters of a pilot model with time-dependent sigmoid functions to characterize time-varying human control behavior. An experiment was performed by 9 general aviation pilots who had to perform a simultaneous roll and pitch control task with time-varying aircraft dynamics. In 8 different conditions, the axis containing the time-varying dynamics and the growth factor of the dynamics were varied, allowing for an analysis of the performance of the estimation method when estimating time-dependent parameter functions. In addition, a detailed analysis of pilots adaptation to the time-varying aircraft dynamics in both the roll and pitch axes could be performed. Pilot control behavior in both axes was significantly affected by the time-varying aircraft dynamics in roll and pitch, and by the growth factor. The main effect was found in the axis that contained the time-varying dynamics. However, pilot control behavior also changed over time in the axis not containing the time-varying aircraft dynamics. This indicates that some cross coupling exists in the perception and control processes between the roll and pitch axes
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