The price of victory: the Sunflower Ordnance Works and Desoto and Eudora Kansas

Call number: LD2668 .R4 HIST 1989 V36Master of ArtsHistor

Survey Of Canadian Orthodontists Regarding Orthodontic Miniscrew Usage

Purpose: To obtain information on the clinical utilization of orthodontic miniscrews (OMSs) among orthodontists in Canada Methods: Web-based software was used to fabricate a questionnaire in which respondents were asked questions regarding their usage of OMSs in their clinical practice. The survey consisted of between 11 and 39 questions, depending on the respondents’ answers. The survey was distributed via email to the 353 active Canadian members of the American Association of Orthodontists (AAO). Results: A total of 82 Canadian orthodontists responded to the survey, for a response rate of 23.2%. Among them, 65.8% currently used miniscrews in their clinical practice. The most common reason given for not using OMSs was a doctor preference for conventional less invasive mechanics. At the time of the survey, most Canadian orthodontists who were currently using OMSs had been doing so for 6-10 years. Most respondents were placing OMSs personally with the primary reason for referral being the longer chair time required for placement. The most commonly used placement locations were the maxillary and mandibular alveolar buccal areas. The most common applications were posterior intrusion and molar protraction. Most respondents used a panoramic radiograph to plan OMS placement and used local infiltration for anesthesia. The majority of orthodontists never used a surgical guide, drilled a pilot hole, or measured insertion torque during OMS placement. Both direct and indirect forces were frequently applied to OMSs, and the load was usually applied immediately. The most frequently observed complications were screw loosening and soft tissue overgrowth or irritation. The mean self-reported OMS failure rate was 19.6% ± 15.7%, with failures most frequently reported in the maxillary alveolar buccal areas. Most respondents felt that OMSs have increased treatment options, reduced patient compliance required, and decreased the number of cases requiring prosthodontic treatment. A majority of Canadian orthodontists are satisfied with their OMS treatment outcomes with most agreeing that OMSs have made treatment more predictable and better overall. Conclusions: This survey illustrates that while Canadian orthodontists in 2020 have similar opinions in regard to OMS usage with orthodontists surveyed in the past and in other countries, a few differences do exist

The Relationship Between Students\u27 Tracking of Their Learning Data and Overall Academic Achievement in Fifth-Grade Mathematics

Teachers are in a constant cycle of data collection to guide instruction and increase student achievement; however, students are not always involved in the data collection or discussion of their own learning data. The purpose of this correlational study was to explore the relationship between students’ tracking of their own learning data and their academic achievement in fifth-grade mathematics as measured by the aimswebPlus assessment. A convenience sample of 154 students from a middle school in a southern Tennessee school district participated in the study using archival data. A Pearson Product Moment Correlation was used to test the null hypothesis to describe the strength and direction of the relationship between students’ tracking of their own learning data as measured by a researcher-created instrument and their academic achievement as measured by the aimswebPlus assessment. It was discovered that no significant relationship was found between students’ tracking of their own learning data and their academic achievement in fifth-grade mathematics. It was concluded that the relationship between students’ fidelity to data tracking and their overall academic achievement could possibly have been significant if the teachers and students received more training on how to track data and use the data tracker notebooks and if students not only tracked their learning data but set individual learning goals based on the data. Since clearer training and the use of student-focused goals was considered as the next step in the process of using student data to increase their academic achievement and allow students to be leaders in their own learning, it would be helpful to conduct a study that seeks to determine the types of student data tracking tools and processes that are most beneficial to increasing student achievement

Estimating the angle of attack from blade pressure measurements on the National Renewable Energy Laboratory phase VI rotor using a free wake vortex model : yawed conditions

Wind turbine design codes for calculating blade loads are usually based on a blade element momentum (BEM) approach. Since wind turbine rotors often operate in off-design conditions, such as yawed flow, several engineering methods have been developed to take into account such conditions. An essential feature of a BEM code is the coupling of local blade element loads with an external (induced) velocity field determined with momentum theory through the angle of attack. Local blade loads follow directly from blade pressure measurements as performed in the National Renewable Energy Laboratory (NREL) phase IV campaign, but corresponding angles of attack cannot (on principle) be measured. By developing a free wake vortex method using measured local blade loads, time-dependent angle of attack and induced velocity distributions are reconstructed. In a previous paper, a method was described for deriving such distributions in conjunction with blade pressure measurements for the NREL phase VI wind turbine in axial (non-yawed) conditions. In this paper, the same method is applied to investigate yawed conditions on the same turbine. The study considered different operating conditions in yaw in both attached and separated flows over the blades. The derived free wake geometry solutions are used to determine induced velocity distributions at the rotor blade. These are then used to determine the local (azimuth time dependent) angle of attack, as well as the corresponding lift and drag for each blade section. The derived results are helpful to develop better engineering models for wind turbine design codes.peer-reviewe

Pattern and predictability of potential wind assistance for waders and geese migrating from West Africa and the Wadden Sea to Siberia

Analysed published wind data from the period 1979-1991 to evaluate to what extent migrating waders and geese might benefit from tailwind assistance when flying at altitudes ranging from ground level up to 5.5 km from West Africa (Banc d'Arguin, Mauritania) to the Wadden Sea (Netherlands, Germany and Denmark) in late April and early May, and from the Wadden Sea to Taymyr Peninsula (Siberia) in late May and early June. Between West Africa and the Wadden Sea it is usually advantageous to fly high, with an average tailwind of 15 km/h (mean of yearly averages) for those birds flying along the optimal height track. There were large differences between years though, with 36 km/h tailwind (1983) and 2 km/h headwind (1991) as extreme values. Best altitudes for migration were higher along the northwest African coast than over Europe. There was no evidence for consistent seasonal changes in wind favourability, but "bad' years were consistently bad over the whole season. Between the Wadden Sea and the Taymyr Peninsula wind conditions were better still than for the Banc d'Arguin-to-Wadden Sea journey (long term average for flights along optimal height track is 21 km/h tailwind), with the favourable winds found at intermediate altitudes (1.5-3 km). -from Authors</p

HAWT near-wake aerodynamics, part I : axial flow conditions

An improved physical understanding of the rotor aerodynamics of a horizontal axis wind turbine (HAWT) is required to reduce the uncertainties associated with today’s design codes. Wind tunnel experiments contribute to increased knowledge and enable valida- tion and construction of models. The present study focuses on the near-wake of a model HAWT in both axial and yawed flow conditions. At three downstream planes parallel to the rotor plane, single-sensor hot-film traverses are made. The phase-locked unsteady three- dimensional flow velocity vector is determined by a novel data reduction method. A series of two papers discusses the near-wake aerodynamics of a model HAWT. The main goals are to obtain a detailed understanding of the near-wake development and to arrive at a base for model construction and validation. The first paper presents the experimental setup, data reduction and the results for the baseline case (axial flow conditions). In the second paper, the results for the yawed flow cases are presented and the effect of yaw misalignment on the near-wake development is discussed. Copyrightpeer-reviewe

Real-Time Operating System/360

RTOS has a cost savings advantage for real-time applications, such as those with random inputs requiring a flexible data routing facility, display systems simplified by a device independent interface language, and complex applications needing added storage protection and data queuing