Showing papers by "Florida State University published in 1995"

Long-term working memory

Abstract: To account for the large demands on working memory during text comprehension and expert performance, the traditional models of working memory involving temporary storage must be extended to include working memory based on storage in long-term memory. In the proposed theoretical framework cognitive processes are viewed as a sequence of stable states representing end products of processing. In skilled activities, acquired memory skills allow these end products to be stored in long-term memory and kept directly accessible by means of retrieval cues in short-term memory, as proposed by skilled memory theory. These theoretical claims are supported by a review of evidence on memory in text comprehension and expert performance in such domains as mental calculation, medical diagnosis, and chess.

The Construction of Situation Models in Narrative Comprehension: An Event-Indexing Model

Abstract: In this article, we propose and test a model of how readers construct representations of the situations described in simple narratives the event-indexing model According to the event-indexing model, events are the focal points of situations conveyed in narratives and are connected in memory along five dimensions time, space, protagonist, causality, and intentionality The results of a verb-clustering task provide strong support for the event-indexing model

Extraction of mid-ocean-ridge basalt from the upwelling mantle by focused flow of melt in dunite channels

Abstract: Like residual peridotites from mid-ocean ridges, peridotites from the mantle section of the Oman ophiolite are far from equilibrium with mid-ocean-ridge basalt (MORB). By contrast, dunites from Oman are close to equilibrium with MORB, indicating that they were conduits for focused melt flow. Formation of dunite conduits by porous flow is sufficient to explain extraction of MORB from the mantle, and fracture mechanisms may not be necessary in this process.

Risk and Religion: An Explanation of Gender Differences in Religiosity

Abstract: De nombreuses etudes ont deja montre qu'il existait une difference entre les sexes du point de vue de la religiosite, les femmes apparaissant plus religieuses que les hommes. Les A.A. proposent d'envisager les differences au sujet du risque en relation avec les differences de religiosite. A partir du concept classique de pari pascalien, ils concoivent l'attitude religieuse comme une repugnance au risque et l'attitude non religieuse comme une prise de risque. Les attitudes adoptees par rapport au risque attenuent fortement les differences de religiosite. C'est egalement un indicateur significatif de la religiosite a l'interieur de chaque sexe

Computational aeroacoustics - Issues and methods

Abstract: Computational fluid dynamics (CFD) has made tremendous progress especially in aerodynamics and aircraft design over the past 20 years. An obvious question to ask is "why not use CFD methods to solve aeroacoustics problems?" Most aerodynamics problems are time independent, whereas aeroacoustics problems are, by definition, time dependent. The nature, characteristics, and objectives of aeroacoustics problems are also quite different from the commonly encountered CFD problems. There are computational issues that are unique to aeroacoustics. For these reasons computational aeroacoustics requires somewhat independent thinking and development. The objectives of this paper are twofold. First, issues pertinent to aeroacoustics that may or may not be relevant to computational aerodynamics are discussed. The second objective is to review computational methods developed recently that are designed especially for computational aeroacoustics applications. Some of the computational methods to be reviewed are quite different from traditional CFD methods. They should be of interest to the CFD and fluid dynamics communities.

Situated cognition and learning environments: roles, structures, and implications for design

Abstract: Situated cognition has emerged as a powerful perspective in providing meaningful learning and promoting the transfer of knowledge to real-life situations. While considerable interest has been generated in situated learning environments, few guidelines exist related to their design. The purpose of this paper is to examine the theoretical underpinnings of situated cognition and to derive implications for the design of situated learning environments. The conceptual framework centers on four basic issues: the role of context, the role of content, the role of facilitation, and the role of assessment.

Sperm limitation in the sea

Abstract: Because sperm outnumber eggs, it is often assumed that variation in female reproductive success has little to do with male or sperm availability. Similarly for males, access to viable eggs and sperm competition are thought to drive variation in male fertilization success. These assumptions result from empirical studies on organisms with internal fertilization. However, recent evidence from free-spawning organisms suggests that sperm can often be limiting. This finding may alter our perspective on mating-system evolution, especially in externally fertilizing organisms.

Predicting patterns of prey use from morphology of fishes

Abstract: Ecomorphological analyses that search for patterns of association between morphological and prey-use data sets will have a greater chance of understanding the causal relationships between form and diet if the morphological variables used have known consequences for feeding performance. We explore the utility of fish body size, mouth gape and jaw-lever mechanics in predicting patterns of prey use in two very different communities of fishes, Caribbean coral reef fishes, and species of the Centrarchidae that live in Lake Opinicon, Ontario. In spite of major differences in the spectrum of potential prey available, the centrarchids of Lake Opinicon show dietary transitions during ontogeny that are very similar to those seen among and within species of Caribbean groupers (Serranidae). The transition from small zooplankton to intermediate sized invertebrates and ultimately to fishes appears to be very general in ram-suction feeding fishes and is probably driven largely by the constraints of mouth size on prey capture ability. The jaw-lever systems for mouth opening and closing represent direct trade-offs for speed and force of jaw movement. The ratio of in-lever to out-lever in the opening system changes during ontogeny in bluegill, indicating that the mechanics and kinematics of jaw movement may change as well. Among 34 species of Caribbean reef fishes, biting species had jaw-closing ratios that favored force translation, while species that employ rapid-strike ram-suction had closing ratios that enhanced speed of closing and mouth opening ratios that favored a more rapid expansion of the mouth during the strike. We suggest that when prey are categorized into functional groups, reflecting the specific performance features that are important in capturing and handling them, and the differences among habitats in the available prey resource are taken into account, general patterns can be found in morphology-diet relations that cross phylogenetic boundaries.

Two-phase binary fluids and immiscible fluids described by an order parameter

Abstract: A unified framework for coupled Navier-Stokes/Cahn-Hilliard equations is developed using, as a basis, a balance law for microforces in conjunction with constitutive equations consistent with a mechanical version of the second law. As a numerical application of the theory, we consider the kinetics of coarsening for a binary fluid in two space-dimensions.

Handbook of perturbative QCD

Abstract: The elements, theoretical basis, and experimental status of perturbative quantum chromodynamics are presented. Relevant field-theoretic methods are introduced at a nonspecialist level, along with a review of the basic ideas and methods of the parton model. This is followed by an account of the fundamental theorems of quantum chromodynamics, which generalize the parton model. Summaries of the theoretical and experimental status of the most important hard-scattering processes are then given, including electron-positron annihilation, deeply inelastic scattering, and hard hadron-hadron scattering, as induced both by electoweak interactions and by quantum chromodynamics directly. In addition, a discussion is presented of the global fitting approach to the determination of parton distributions in nucleons.

Performance of the ALEPH detector at LEP

Abstract: The performance of the ALEPH detector at the LEP e+e− collider is reviewed. The accuracy of the tracking detectors to measure the impact parameter and momentum of charged tracks is specified. Calorimeters are used to measure photons and neutral hadrons, and the accuracy obtained in energy and angle is given. An essential property of the detector is its ability to identify particles; the performance in identification of electrons, muons, neutrinos (from missing energy), charged hadrons, π0's and V0's is described.

Optimization and troubleshooting in PCR.

Abstract: The use of polymerase chain reaction (PCR) to generate large amounts of a desired product can be a double-edged sword. Failure to amplify under optimum conditions can lead to the generation of multiple undefined and unwanted products, even to the exclusion of the desired product. At the other extreme, no product may be produced. A typical response at this point is to vary one or more of the many parameters that are known to contribute to primer-template fidelity and primer extension. High on the list of optimization variables are Mg concentrations, buffer pH, and cycling conditions. With regard to the last, the annealing temperature is most important. The situation is further complicated by the fact that some of the variables are quite interdependent. For example, because dNTPs directly chelate a proportional number of Mg ions, an increase in the concentration of dNTPs decreases the concentration of free Mg available to influence polymerase function. This article discusses various optimization strategies, including touchdown PCR and hot-start PCR.

The Outsourcing of Information Services: Transforming the Nature of Business in the Information Industry:

Abstract: The structure of the decision faced by a firm to outsource or to retain information services is developed in this paper Theory regarding the decision structure is discussed and the results of in-depth interviews with a variety of chief information officers presented Specifically, the forces that drive the outsourcing decision are identified, the incentives and disincentives of outsourcing relationships being addressed in detail A framework for contemplating the outsourcing option is presented, followed by recommendations on managing relationships with outsourcing vendors

Economic context and the health effects of unemployment.

Abstract: Most studies of the health consequences of unemployment ignore the economic context within which job loss occurs. Using data from a subset (N = 1,252) of a national probability sample, this paper compares the effects of current and previous unemployment on depression and subjective physical health status across levels of educational attainment and local job availability. Results show that current unemployment effects among the previously unemployed are strongest in low unemployment areas, particularly among individuals with a college-level education. These findings are interpreted in terms of the two categories of unemployment-related stress most frequently identified in the literature: financial strain, which is thought to be more salient for people in lower socioeconomic statuses, and damage to sense of self, which may primarily characterize higher status victims of job loss.

Teachers Attitudes Toward Increased Mainstreaming: Implementing Effective Instruction for Students with Learning Disabilities

Abstract: To investigate the types of instructional strategies offered in mainstream classes, we asked 127 mainstream teachers in Grades 1 through 8 to complete a self-evaluation concerning instructional strategies used in their general education classes. Also, each teacher completed questionnaires concerning their attitudes toward their own efficacy and toward mainstreaming. ANOVAs comparing teachers with positive attitudes toward mainstreaming and teachers with less positive attitudes indicated that the teachers with less positive attitudes used effective mainstream instructional strategies less frequently. Implications of these results in terms of recent educational initiatives resulting in increased inclusion programs are discussed.

What is phonological awareness

Abstract: Phonological awareness was hypothesized to be composed of at least 3 component skills- IQ, verbal short-term memory, and speech perception. In addition, 4 linguistic manipulations within 3 phonological awareness tasks were theorized to affect item difficulties. Multiple measures of IQ, verbal short-term memory, speech perception, and phonological awareness were administered to 136 3rd and 4th graders. Application of structural equation modeling revealed that IQ, speech perception, and verbal short-term memory each contributed unique variance to the phonological awareness construct. All 4 experimental linguistic manipulations influenced phonological awareness item difficulties as well. Results underscore the importance of speech perception for phonological awareness

Issues in training older adults to use computers

Abstract: Given the aging of the workforce and the general population, it is important to determine how best to train older adults to use computers. Generally, research has shown that training takes significantly more time for older adults compared with younger learners, and that older adults commit more errors in post-training evaluations. This paper reviews research demonstrating age differences in learning to use a computer. We also explore the effects of attitudes, anxiety, and cognitive abilities on computer use, as well as research on training novices to use computers. Finally, we discuss designing the human-computer interface for the advantage of older users.

Structural polymorphism of bacterial adhesion pili

Abstract: Bacterial adhesion pili are designed to bind specifically and maintain attachment of bacteria to target cells. Uropathogenic P-pili are sufficiently mechanically resilient to resist the cleansing action of urine flow that removes most other bacteria. P-pili are 68 A in diameter and approximately 1 micron long, and are composed of approximately 1,000 copies of the principal structural protein, PapA. They are attached to the outer membrane by a minor structural protein, PapH and are terminated by an approximately 20 A diameter fibrillus composed of PapK, PapE and PapF, which presents the host-binding adhesin PapG. The amino-acid sequences of PapA, PapE, and PapF are similar, with highly conserved C-termini being responsible for binding to PapD, the periplasmic chaperone. Our three-dimensional reconstruction indicates that pili are formed by the tight winding of a much thinner structure. A structural transition allows the pilus to unravel without depolymerizing, producing a thin, extended structure five times the length of the original pilus.

An examination of beliefs about older workers: Do stereotypes still exist?

Abstract: This study examined individuals' beliefs about older workers. Of particular interest was the relationship between those beliefs and individuals' (a) interactions with older workers, (b) supervisory status, and (c) demographic variables. Findings indicated that although older workers hold more positive beliefs about older workers than younger workers hold, even younger workers tended to have generally positive beliefs. Chronological age was found to moderate two relationships. First, the number of younger workers' interactions with older workers significantly, positively affected younger workers' beliefs about older workers. Second, an examination of the interaction between supervisory status and age found that older supervisors hold more negative beliefs about older workers than younger supervisors.

Institutionalization of organizational ethics through transformational leadership

Abstract: Concerns regarding corporate ethics have grown steadily throughout the past decade. In order to remain competitive, many organizational leaders are faced with the challenge of creating an ethical environment within their organization. A model is presented showing the process and elements necessary for the institutionalization of organizational ethics. The transformational leadership style lends itself well to the creation of an ethical environment and is suggested as a means to facilitate the institutionalization of corporate ethics. Finally, the benefits of using transformational leadership are demonstrated through the components of a psychological contract, organizational commitment, and ethical culture to institutionalize organizational ethics.