Measurements of Flow Rate and Trajectory of Aircraft Tire-Generated Water Spray

An experimental investigation was conducted at the NASA Langley Research Center to measure the flow rate and trajectory of water spray generated by an aircraft tire operating on a flooded runway. Tests were conducted in the Hydrodynamics Research Facility and made use of a partial airframe and a nose tire from a general aviation aircraft. Nose tires from a commercial transport aircraft were also used. The effects of forward speed, tire load, and water depth on water spray patterns were evaluated by measuring the amount and location of water captured by an array of tubes mounted behind the test tire. Water ejected from the side of the tire footprint had the most significant potential for ingestion into engine inlets. A lateral wake created on the water surface by the rolling tire can dominate the shape of the spray pattern as the distance aft of the tire is increased. Forward speed increased flow rates and moved the spray pattern inboard. Increased tire load caused the spray to become less dense. Near the tire, increased water depths caused flow rates to increase. Tests using a fuselage and partial wing along with the nose gear showed that for certain configurations, wing aerodynamics can cause a concentration of spray above the wing

Back to Basics: A New Look at Gate-revenue Sharing and Competitive Balance

Most models with profit maximizing teams conclude that competitive balance is unchanged or reduced in response to gate sharing. We critique these models and then develop three alternatives: adding unshared post-season revenue; modelling the largest market team as a dominant firm with a rising marginal cost of talent; and a new general model that incorporates both a consumer demand for athletic talent and close competition. All three approaches can cause gate sharing to increase competitive balance.Sport, Monopsony, Monopoly Power

Teaching child development principles to parents: A cognitive-developmental approach

Dissertation (Ed.D.)--Boston University, 1983The purpose of this study was to determine if a 12-week course would result in increased parental awareness and improved perceptions of parental behavior. The format included child development information and group problem solving of parent-child conflict dilemmas. A pre/post control group design was used with equivalent voluntary groups. The statistical techniques employed to analyze the data were the analysis of covariance and the t-test for correlated samples. The treatment group consisted of 11 parents and their 16 children while the control group comprised 11 parents and their 14 children. The Newberger (1977) Parental Awareness Scale (PAS) was administered to both sets of parents subsequent to the program and to the treatment group parents four months later. A modified version of the Schaefer (1965) Children's Reports of Parental Behavior Inventory (CRPBI) was administered to the parents and children of both groups. Analysis of the results of the PAS indicated that parents in the treatment group significantly increased their levels of parental awareness upon termination of the program (p<.03) and made further significant gains following a four month hiatus (p<.05). The results of the modified CRPBI indicated that parents perceived themselves as improving in their behavior to a significant level (p<.05) upon completion of the program but did not make likewise gains when retested four months later. The children of the parents of both groups failed to perceive improved behavior on the part of their parents. These results tentatively indicate that cognitive-structural growth can occur over time when the original stimulus conditions which facilitated it have been removed. It also appears that cognitive-developmentally oriented parent intervention is conducive to such growth. [TRUNCATED

Developing Collaborative XML Editing Systems

In many areas the eXtensible Mark-up Language (XML) is becoming the standard exchange and data format. More and more applications not only support XML as an exchange format but also use it as their data model or default file format for graphic, text and database (such as spreadsheet) applications. Computer Supported Cooperative Work is an interdisciplinary field of research dealing with group work, cooperation and their supporting information and communication technologies. One part of it is Real-Time Collaborative Editing, which investigates the design of systems which allow several persons to work simultaneously in real-time on the same document, without the risk of inconsistencies. Existing collaborative editing research applications specialize in one or at best, only a small number of document types; for example graphic, text or spreadsheet documents. This research investigates the development of a software framework which allows collaborative editing of any XML document type in real-time. This presents a more versatile solution to the problems of real-time collaborative editing. This research contributes a new software framework model which will assist software engineers in the development of new collaborative XML editing applications. The devised framework is flexible in the sense that it is easily adaptable to different workflow requirements covering concurrency control, awareness mechanisms and optional locking of document parts. Additionally this thesis contributes a new framework integration strategy that enables enhancements of existing single-user editing applications with real-time collaborative editing features without changing their source code

Spatial judgment in Parkinson's disease: Contributions of attentional and executive dysfunction

Spatial judgment is impaired in Parkinson's disease (PD), with previous research suggesting that disruptions in attention and executive function are likely contributors. If judgment of center places demands on frontal systems, performance on tests of attention/executive function may correlate with extent of bias in PD, and attentional disturbance may predict inconsistency in spatial judgment. The relation of spatial judgment to attention/executive function may differ for those with left-side versus right-side motor onset (LPD, RPD), reflecting effects of attentional lateralization. We assessed 42 RPD, 37 LPD, and 67 healthy control participants with a Landmark task (LM) in which a cursor moved horizontally from the right (right-LM) or left (left-LM). The task was to judge the center of the line. Participants also performed neuropsychological tests of attention and executive function. LM group differences were found on left-LM only, with both PD subgroups biased leftward of the control group (RPD p < .05; LPD p < .01; no RPD-LPD difference). For left-LM trials, extent of bias significantly correlated with performance on the cognitive tasks for PD but not for the control group. PD showed greater variability in perceived center than the control group; this variability correlated with performance on the cognitive tasks. The correlations between performance on the test of spatial judgment and the tests of attention/executive function suggest that frontal-based attentional dysfunction affects dynamic spatial judgment, both in extent of spatial bias and in consistency of response as indexed by intertrial variability. (PsycINFO Database Record (c) 2019 APA, all rights reserved).R01 NS067128 - NINDS NIH HHS; R21 NS043730 - NINDS NIH HHS; National Institute of Neurological Disorders and Stroke; American Parkinson's Disease Association; Massachusetts ChapterAccepted manuscrip

Currents, Vol.5, No.9 (Jan.26, 1987)

Phyllis F. Healy Leads MSNA Into An Exciting Future--Presidential Search Update--Concert Hall Project Completed--Sexual Harassment Policy Restated--Upeat Developments for Patients--Campus Center Hosts Work of New England Artists--Chuck Lamb Reception--Honors Committee Needs Nominees--DFM Regrouping--An Off-Broadway Debuthttps://digitalcommons.usm.maine.edu/currents/1162/thumbnail.jp

Currents, Vol.5, No.11 (Feb.23, 1987)

And the Winners Are...Robert McGurn and Michelle Damato! :American College Theatre Festival--Computer Adventures in Cairo (Bruce MacLeod)--Presidential Fellowship Deadline Nears--Sue Ellen Kuzma in Concert--National Women\u27s History Month Observed at USMhttps://digitalcommons.usm.maine.edu/currents/1164/thumbnail.jp

The stable fixtures problem—A many-to-many extension of stable roommates

AbstractWe study a many-to-many generalisation of the well-known stable roommates problem in which each participant seeks to be matched with a number of others. We present a linear-time algorithm that determines whether a stable matching exists, and if so, returns one such matching

Studying the Child Obesity Epidemic with Natural Experiments

We utilize clinical records of successive visits by children to pediatric clinics in Indianapolis to estimate the effects on their body mass of environmental changes near their homes. We compare results for fixed-residence children with those for cross-sectional data. Our environmental factors are fast food restaurants, supermarkets, parks, trails, and violent crimes, and 13 types of recreational amenities derived from the interpretation of annual aerial photographs. We looked for responses to these factors changing within buffers of 0.1, 0.25, 0.5, and 1 mile. We found that cross-sectional estimates are quite different from the Fixed Effects estimates of the impacts of amenities locating near a child. In cross section nearby fast food restaurants were associated with higher BMI and supermarkets with lower BMI. These results were reversed in the FE estimates. The recreational amenities that appear to lower children's BMI were fitness areas, kickball diamonds, and volleyball courts. We estimated that locating these amenities near their homes could reduce the weight of an overweight eight-year old boy by 3 to 6 pounds