154 research outputs found

    The effect of massed followed by evenly spaced practice on learning a motor skill

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    Thesis (M.A.)--Boston University, 1949. This item was digitized by the Internet Archive

    Pitch Perception of Frequency Glides

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    A rising or falling frequency glide at the end of a sustained tone is perceived as being of greater extent and longer duration than the identical physical phenomenon occurring at the beginning of the tone. This is true for both complex and pure tones, with intensity constant or varying

    Central Determinants of Peripheral Manifestations in Reading

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    Numerous investigations have shown that poor reading is accompanied by irregularities in the eye-movements of the reader. The most marked of these is regressive movement, that is, backward movement of the eyes to places previously looked at. Clinicians in remedial reading have been much struck by the presence of these irregularities, and have sometimes attempted to improve reading by treating the eye-movements as such. The question investigated by this research is: Do irregular eye-movements cause poor reading, or does poor reading cause irregular eye-movements? If poor reading is shown to be the cause of poor eye-movements, then it is obviously fallacious to attempt the improvement of reading by working on the eye-movements

    Common and Differential Factors in Reading Vocabulary and Hearing Vocabulary

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    Numerous studies have shown that recognition of word meaning is closely related to reading ability. All of these studies, however, measured reading vocabulary only. This research attempts to determine how recognition of read and heard words compares, and how the two types of vocabulary are related to reading ability. Since material is held constant, but the mode of presentation is varied, this approach should make possible the study of certain common and specific elements in the abilities to recognize words read and heard, and to determine the manner in which this relationship is affected by reading ability

    Galileo in Maritime Applications

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    The past decade has seen the continued growth of GPS and its many different applications. The European Union and the European Space Agency has announced the development of the European Global Navigation Satellite System - Galileo. Clearly acceptance of additional satellite systems into markets that successfully use GPS will require identification of those key areas where Galileo is capable of providing added-value, either standalone or more likely as a component of an overall integrated suite of navigation systems. These key areas are often termed the key differentiators for Galileo. This paper introduces three projects; GALEWAT, MARGAL and GEM. The GALEWAT project is fully funded by the European Space Agency (ESA), while MARGAL is 50% co-funded and GEM fully funded by the European Union (EU) through the Sixth Framework Research and Development Programme which is being administered on behalf of the EU by the Galileo Joint Undertaking (GJU). The overall aim of all three projects is to raise awareness of Galileo. GALEWAT is a project running since 05/2003 with the focus of demonstration the feasibility of the introduction of EGNOS in the upcoming River Information Services (RIS). The MARGAL project focuses on the maritime use of Galileo, whereas GEM is concerned with the standardization of Galileo as part of the World Wide Radio-Navigation Service (WWRNS) as well as performance requirements and testing standards for Galileo receivers; both projects are running over a two-year period, commencing from early 2004. This paper aims to provide an introduction to, and an overview of these projects, informing the reader where they may benefit from the introduction of Galileo. The paper starts by reviewing the perceived benefits of Galileo and demonstrates, through the use of a third party software model, where Galileo will benefit the mariner. The GALEWAT project has analysed the technical feasibility and performance of the introduction of EGNOS in upcoming River Information Services, while the aim of MARGAL is twofold: the demonstration of an end-to-end value added navigation services in the inland waterway domain as well as for port approach and harbour navigation in the maritime domain. For MARGAL, this paper reports on the development of a measurement program to identify where Galileo has the potential to benefit the mariner along with the development of the MARGAL system for harmonised navigation. Finally this paper also details work on the lengthy standardisation procedure that is being undertaken as part of the GEM project. Reprinted with permission from The Institute of Navigation (http://ion.org/) and The Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation, (pp. 779-787). Fairfax, VA: The Institute of Navigation

    An Experimental Study of Auditory Signal Detection in Noise as a Function of Signal Voltage with Special Reference to the Influence of Subject Set

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    Control Systems Laboratory changed its name to Coordinated Science LaboratoryContract DA-11-022-ORD-72

    Fishing For Food: Values and Benefits Associated With Coastal Infrastructure

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    While there is substantial literature about the socio-cultural characteristics and values associated with recreational and commercial fisheries in the U.S., studies directed at those who ‘fish for food’—those who depend on consuming their catch to various degrees—are relatively sparse. Using qualitative data collected through 80 semi-structured interviews with fishers in the summer and fall of 2018 in Carteret County, North Carolina, this study aims to better understand the group of recreational fishers who consume their catch by describing social and cultural dimensions and values associated with fishing for food, examining the role of infrastructure in facilitating access to benefits associated with this activity, and considering how knowledge of existing licensing regulations surrounding subsistence license waivers affect this fishing community. Interviews conducted at free public fishing structures in the region revealed that fishers derive a variety of values and benefits from fishing at these sites, including access to recreation, nutrition, a social community, and mental health benefits, which were found to be negatively impacted by Hurricane Florence in September 2018. We also found an informal economy of sharing catch on- and off-site that extends the reach and benefits facilitated by public infrastructure to people beyond those using it directly. Overall, we call for conceptualizations of ‘fishing for food’ that include aspects that go beyond traditional definitions of ‘subsistence’ or ‘recreational’ fishing such as food security, access, and less obvious social and cultural motivations behind the activity. These findings are a compelling rationalization for the creation and maintenance of formal and informal fishing places locally and, by extension, in other coastal areas, given the array of benefits provided by access to these types of locations

    Photo-active collagen systems with controlled triple helix architecture

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    The design of photo-active collagen systems is presented as a basis for establishing biomimetic materials with varied network architecture and programmable macroscopic properties. Following in-house isolation of type I collagen, reaction with vinyl-bearing compounds of varied backbone rigidity, i.e. 4-vinylbenzyl chloride (4VBC) and glycidyl methacrylate (GMA), was carried out. TNBS colorimetric assay, 1H-NMR and ATR-FTIR confirmed covalent and tunable functionalization of collagen lysines. Depending on the type and extent of functionalization, controlled stability and thermal denaturation of triple helices were observed via circular dichroism (CD), whereby the hydrogen-bonding capability of introduced moieties was shown to play a major role. Full gel formation was observed following photo-activation of functionalized collagen solutions. The presence of a covalent network only slightly affected collagen triple helix conformation (as observed by WAXS and ATR-FTIR), confirming the structural organization of functionalized collagen precursors. Photo-activated hydrogels demonstrated an increased denaturation temperature (DSC) with respect to native collagen, suggesting that the formation of the covalent network successfully stabilized collagen triple helices. Moreover, biocompatibility and mechanical competence of obtained hydrogels were successfully demonstrated under physiologically-relevant conditions. These results demonstrate that this novel synthetic approach enabled the formation of biocompatible collagen systems with defined network architecture and programmable macroscopic properties, which can only partially be obtained with current synthetic methods
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