Pressure distribution on a hydrofoil running near the water surface

The effect of the free surface on the pressure distribution on the upper side of a shallow-running hydrofoil is considered from a general point of view. Previous theoretical and experimental work is reviewed in order to compare the range of flow variables for which each treatment of the surface proximity problem is valid. A qualitative theoretical expression for the pressure is developed. This result shows the relative importance of the pertinent parameters and it is shown to agree qualitatively with previous experiments as well as with new pressure measurements made in the Free Surface Water Tunnel. The above considerations reinforce the view generally held in the past, that the methods of potential theory when properly applied to hydrofoils at shallow submergences may be expected to lead to valid and useful results

Detection of ocean color changes from high altitudes

The detection of ocean color changes, thought to be due to chlorophyll concentrations and gelbstoffe variations, is attempted from high altitude (11.3km) and low altitude (0.3km). The atmospheric back scattering is shown to reduce contrast, but not sufficiently to obscure color change detection at high altitudes

Online Fan Communities: Welcoming Behavior, Brand Community Markers, and Multiple Identities in Sports Fandom

Online fan communities have revolutionized the way sport consumers engage with fellow fans and the sports product. The traditional regional boundaries that once characterized sports fandom have been mitigated by the emergence of new media, social media platforms, and online fan communities. This dissertation explores the non-geographically bound nature of contemporary sports fan communities, examining the evolving dynamics of fan behavior in the digital age. In Study 1, an interactional perspective is employed to explore online fan socialization. The focus is on how new fans\u27 self-presentation influences acceptance within NFL team-specific Reddit communities. Utilizing data mining, textual analysis, and qualitative coding, the study reveals that the presentation of new fans significantly impacts community acceptance, shedding light on the foundations of online fan socialization. Study 2 investigates a newly formed online fan community for a professional sports team, aiming to understand how sport fan communities negotiate and establish brand community markers through discourse. Drawing from the communities of practice framework and discursive psychology, the study explores the development of a collective identity over time. Analyzing posts from the team\u27s announcement through their second season, this investigation provides insights into the negotiation of community meaning and the construction of norms and prototypes. In Study 3, a holistic examination of online fan behavior explores how members engage with other communities beyond their primary team\u27s community. Utilizing data mining and content analysis, the study investigates how online sports fans incorporate other online communities (e.g., other teams, sport-related communities) into their broader online fan experience. This exploration offers a nuanced understanding of diverse identities enacted within digital sports spaces, with a focus on sport fan maximizing behavior. Collectively, this dissertation contributes to the expanding body of research on online sports fandom, providing valuable insights into the intricacies of fan socialization, the negotiation of collective identities, and the multifaceted nature of online fan behavior. As the sports landscape continues to evolve in the digital era, this research seeks to deepen our understanding and enhance the scholarship surrounding the online sports fan experience

A Suggested Program of Study in Distributive Education for Sevier Valley Tech

The world of work is constantly changing. New jobs and new job descriptions are constantly being added to the work force. \u27 Since change is inevitable and desirable, the business curriculum, to~ must be altered to bridge the gap between school and the world of work. Constant changes in occupational life result in a need for constant changes in training procedure. New courses must constantly be devised to meet job situations. \u27 When training is given without adequate planning based upon actual occupational needs it is likely to be ineffective. • In the period ahead, further occupational changes will take place resulting in even more adjustments in course-of- study materials. Preparation and planning are basic to meeting the training needs of a changing business community. Rowe said, The development and periodic revision of courses of study or syllabi is the first step toward improvement of instruction

Experiments on Circular Arc and Flat Plate Hydrofoils in Noncavitating and Full Cavity Flows

An investigation in the High Speed Water Tunnel of the two-dimensional hydrodynamic characteristics of sharp-edged hydrofoils is described. The lift, drag, and pitching moment were measured in cavitating and noncavitating flows for flat plate and circular arc profiles. The theory of Wu for the forces on sharp-edged profiles in full cavity flow and the experimental results showed good agreement over a wide range of attack angles

A plan for the characterization, calibration, and evaluation of LAPR-2

A new airborne Linear Array Pushbroom Radiometer (LAPR-II) was built. LAPR-II will use linear arrays of silicon detectors to acquire four channels of digital image data for spectral bands within the visible and near infrared portions of the spectrum (0.4 - 1.0 micrometers). The data will be quantized to 10 bits, and spectral filters for each channel will be changeable in flight. The instrument will initially be flown aboard a NASA/Wallops' aircraft, and off nadir pointing of LAPR-II will be possible. Together, the instrument and its platform will provide a flexible readily available source of digital image data for scientific experiments. If LAPR-II is to serve as a precise scientific instrument, the instrument's characteristics must be quantitatively described and the data must be calibrated with respect to absolute radiometric units. The LAPR-II is described and the work required to characterize the instrument's spectral response, radiometric response, and spatial resolution and to calibrate the response from the many detectors per array is outlined

500-THGC--A 500 NODE TRANSIENT HEAT TRANSFER CODE

This document is a user manual for those who are familiar with problems 500 Node Transient Heat Transfer Code

Water tunnel techniques for force measurements on cavitating hydrofoils

The paper reviews briefly experimental techniques and data-correction procedures developed in connection with studies in the High Speed Water Tunnel, California Institute of Technology, for hydrofoil force measurements. The matters discussed relate chiefly to problems of force measurement in cavitating flow and to procedures devised to solve them. Items considered in this connection are water-tunnel balances, the effects of tip-clearance flows, tare corrections, the importance of cavity-pressure measurements, cavitation scaling, tunnel-wall effects, and hydroelastic effects

Factors Affecting Stakeholders\u27 Willingness to Pay to Prevent the Spread of Aquatic Nuisance Species

Physical separation of the Great Lakes and Mississippi River basins has been identified as the most effective method for preventing the transfer of aquatic nuisance species, particularly Asian carp, from the Mississippi River Basin to the Great Lakes. The U.S. Army Corps of Engineers selected Extension to conduct a study of a key stakeholder group, Great Lakes charter captains, as a first step in assessing public opinion on the issue. Results reveal that the charter captains overwhelmingly support basin separation. Expanded educational outreach related to aquatic nuisance species, basin separation, and so forth would improve the ability of clientele to make informed decisions regarding separation of the basins