438 research outputs found

    Volume CVI, Number 19, April 14, 1989

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    Institute of High Performance Computing, IHPC;University of Perugia, Italy;University of Calgary, Canada;University of Minnesota, MN, USA;Queen's University BelfastInternational Conference on Computational Science and Its Applications - ICCSA 2005 -- 9 May 2005 through 12 May 2005 -- 65625Discrete mathematics is one of the very basic mathematics courses in computer engineering (CE) and/or computer science (CS) departments. This course covers almost all of the basic concepts for many other courses in the curriculum and requires active learning of students. For this purpose, especially "propositions" concept, which cannot be understood well in prior years, should be covered with every detail. Previous studies show that learning by entertaining activities and competition has positive effect on student motivation. In this study, an Internet-based Discrete Mathematics Package (DMP) for "propositions" that can work in mobile devices and encourages competitive learning between students has been developed within related literature. © Springer-Verlag Berlin Heidelberg 2005

    Generalized Mittag-Leffler Distributions and Processes for Applications in Astrophysics and Time Series Modeling

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    Geometric generalized Mittag-Leffler distributions having the Laplace transform 11+ÎČlog⁥(1+tα),00\frac{1}{1+\beta\log(1+t^\alpha)},00 is introduced and its properties are discussed. Autoregressive processes with Mittag-Leffler and geometric generalized Mittag-Leffler marginal distributions are developed. Haubold and Mathai (2000) derived a closed form representation of the fractional kinetic equation and thermonuclear function in terms of Mittag-Leffler function. Saxena et al (2002, 2004a,b) extended the result and derived the solutions of a number of fractional kinetic equations in terms of generalized Mittag-Leffler functions. These results are useful in explaining various fundamental laws of physics. Here we develop first-order autoregressive time series models and the properties are explored. The results have applications in various areas like astrophysics, space sciences, meteorology, financial modeling and reliability modeling.Comment: 12 pages, LaTe

    The risk of telling : a dyadic perspective on romantic partners' responses to child sexual abuse disclosure and their associations with sexual and relationship satisfaction

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    Essai prĂ©sentĂ© Ă  la FacultĂ© des arts et des sciences en vue de l'obtention du grade de Doctorat en psychologie clinique (D. Psy.)Les survivants d’agression sexuelle Ă  l’enfance (ASE) doivent souvent composer avec les consĂ©quences Ă  long terme de ce trauma. Toutefois, il existe une grande variabilitĂ© quant aux impacts individuels de l’ASE. Certains auteurs croient que la rĂ©ponse obtenue lors du dĂ©voilement de l’ASE aux proches du survivant, pourrait ĂȘtre l’un des dĂ©terminants de cette variabilitĂ©. Cependant, le dĂ©voilement Ă  l’ñge adulte, notamment au partenaire amoureux, a Ă©tĂ© peu Ă©tudiĂ©. La prĂ©sente Ă©tude examine les associations entre les rĂ©ponses des partenaires amoureux au dĂ©voilement, tels que perçues par les survivants, ainsi que la satisfaction sexuelle et conjugale des deux membres du couple, auprĂšs d’un Ă©chantillon de 70 couples de la communautĂ© ayant rapportĂ© une ASE et l’ayant dĂ©voilĂ©e Ă  leur partenaire. Les participants ont complĂ©tĂ© des questionnaires auto-rapportĂ©s en ligne. Les rĂ©sultats d’analyses de trajectoire au sein d’un modĂšle « Actor-Partner Interdependence Model » (APIM) indiquent que les rĂ©ponses de « soutien Ă©motionnel » de la part des partenaires durant le dĂ©voilement, telles que perçues par les survivants, Ă©taient positivement associĂ©es Ă  leur propre satisfaction sexuelle ainsi qu’à celle de leur partenaire. Les rĂ©ponses de « stigmatisation/se sentir traitĂ© diffĂ©remment » de la part des partenaires, telles que perçues par les survivants, Ă©taient associĂ©es Ă  une moins bonne satisfaction conjugale, Ă  la fois pour les survivants et leurs partenaires. Les rĂ©sultats suggĂšrent que les rĂ©ponses des partenaires au dĂ©voilement d’une ASE, tels que perçues par les survivants, peuvent avoir un impact positif autant que nĂ©gatif sur la satisfaction conjugale et sexuelle des deux partenaires.Survivors of childhood sexual abuse (CSA) often experience adverse trauma-related long term consequences, which vary widely among survivors. Some authors argued that this variability might be explained in part by the response of others to survivors’ disclosure of the CSA. However, disclosure during adulthood has received little empirical attention, in particular, disclosure to a romantic partner. Among 70 community couples who reported CSA and disclosure to their partner, this study examined associations between survivors’ perception of partner responses to their disclosure, and both partners’ sexual and relationship satisfaction. Participants completed self-report questionnaires online. Results of path analyses within an actor-partner interdependence model indicated that survivors’ perceived partner responses of emotional support to disclosure were associated with their own and their partners' higher sexual satisfaction. Survivors’ perceived responses of being stigmatized/treated differently by the partner were associated with their own and their partners’ poorer relationship satisfaction. Findings suggest that survivor-perceived partner responses to the disclosure of CSA can have both a positive and a negative impact on the sexual and relationship satisfaction of both partners

    Obesity and the Rate of Time Preference: Is there a Connection?

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    We hypothesize that recent trends in U.S. and worldwide obesity are, in part, related to an increase in the marginal rate of time preference, where time preference refers to the rate at which people are willing to trade current benefit for future benefit. The higher the rate of time preference, the larger is the factor by which individuals discount the future health risks associated with current consumption. Data from the United States, as well as international evidence, suggests that a relationship between these two variables is plausible. We encourage researchers to explore the possible link between obesity and time preference, as important insights are likely to result

    Habitat determinants of golden‐headed lion tamarin (Leontopithecus chrysomelas) occupancy of cacao agroforests: Gloomy conservation prospects for management intensification

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    Organismal distributions in human‐modified landscapes largely depend on the capacity of any given species to adapt to changes in habitat structure and quality. The golden‐headed lion tamarin (GHLT; Leontopithecus chrysomelas) is an Endangered primate from the Brazilian Atlantic Forest whose remaining populations occupy heterogeneous landscapes consisting primarily of shade cacao (Theobroma cacao) agroforestry, locally known as cabrucas. This cash crop can coexist with high densities of native tree species and holds a significant proportion of the native fauna, but its widely extolled wildlife‐friendly status is increasingly threatened by management intensification. Although this potentially threatens to reduce the distribution of GHLTs, the main determinants of tamarin's occupancy of cabrucas remain unknown, thereby limiting our ability to design and implement appropriate conservation practices. We surveyed 16 cabruca patches in southern Bahia, Brazil, and used occupancy modeling to identify the best predictors of GHLT patch occupancy. Key explanatory variables included vegetation structure, critical resources, landscape context, human disturbance, and predation pressure. We found a negative relationship between GHLT occupancy and the prevalence of jackfruit trees (Artocarpus heterophylus), which is likely associated with the low representation of other key food species for GHLTs. Conversely, cabrucas retaining large‐diameter canopy trees have a higher probability of GHLT occupancy, likely because these trees provide preferred sleeping sites. Thus, key large tree resources (food and shelter) are currently the main drivers of GHLT occupancy within cabruca agroecosystems. Since both factors can be directly affected by crop management practices, intensification of cabrucas may induce significant habitat impacts on GHLT populations over much of their remaining range‐wide distribution

    Thermodynamic analysis of the Quantum Critical behavior of Ce-lattice compounds

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    A systematic analysis of low temperature magnetic phase diagrams of Ce compounds is performed in order to recognize the thermodynamic conditions to be fulfilled by those systems to reach a quantum critical regime and, alternatively, to identify other kinds of low temperature behaviors. Based on specific heat (CmC_m) and entropy (SmS_m) results, three different types of phase diagrams are recognized: i) with the entropy involved into the ordered phase (SMOS_{MO}) decreasing proportionally to the ordering temperature (TMOT_{MO}), ii) those showing a transference of degrees of freedom from the ordered phase to a non-magnetic component, with their Cm(TMO)C_m(T_{MO}) jump (ΔCm\Delta C_m) vanishing at finite temperature, and iii) those ending in a critical point at finite temperature because their ΔCm\Delta C_m do not decrease with TMOT_{MO} producing an entropy accumulation at low temperature. Only those systems belonging to the first case, i.e. with SMO→0S_{MO}\to 0 as TMO→0T_{MO}\to 0, can be regarded as candidates for quantum critical behavior. Their magnetic phase boundaries deviate from the classical negative curvature below T≈2.5T\approx 2.5\,K, denouncing frequent misleading extrapolations down to T=0. Different characteristic concentrations are recognized and analyzed for Ce-ligand alloyed systems. Particularly, a pre-critical region is identified, where the nature of the magnetic transition undergoes significant modifications, with its ∂Cm/∂T\partial C_m/\partial T discontinuity strongly affected by magnetic field and showing an increasing remnant entropy at T→0T\to 0. Physical constraints arising from the third law at T→0T\to 0 are discussed and recognized from experimental results
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