438 research outputs found
Volume CVI, Number 19, April 14, 1989
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
Geometric generalized Mittag-Leffler distributions having the Laplace
transform 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
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 dâagression sexuelle Ă lâenfance (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 lâASE. Certains auteurs croient que la rĂ©ponse obtenue lors du dĂ©voilement de lâASE aux proches du survivant, pourrait ĂȘtre lâun des dĂ©terminants de cette variabilitĂ©. Cependant, le dĂ©voilement Ă lâĂąge 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 dâun Ă©chantillon de 70 couples de la communautĂ© ayant rapportĂ© une ASE et lâayant dĂ©voilĂ©e Ă leur partenaire. Les participants ont complĂ©tĂ© des questionnaires auto-rapportĂ©s en ligne. Les rĂ©sultats dâanalyses de trajectoire au sein dâun 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 quâĂ 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 dâune 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 survivorsâ 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 survivorsâ perception of partner responses to their disclosure, and both partnersâ sexual and relationship satisfaction. Participants completed self-report questionnaires online. Results of path analyses within an actor-partner interdependence model indicated that survivorsâ perceived partner responses of emotional support to disclosure were associated with their own and their partners' higher sexual satisfaction. Survivorsâ perceived responses of being stigmatized/treated differently by the partner were associated with their own and their partnersâ 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?
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
Neurosurgery concepts: Key perspectives on imaging characteristics of spinal metastases, surgery for low back pain, anesthesia for disc surgery, and laminectomy versus laminectomy and fusion for lumbar spondylolisthesis.
The effectiveness of public health interventions to reduce the health impact of climate change:a systematic review of systematic reviews
Climate change is likely to be one of the most important threats to public health in the coming years. Yet despite the large number of papers considering the health impact of climate change, few have considered what public health interventions may be of most value in reducing the disease burden. We aimed to evaluate the effectiveness of public health interventions to reduce the disease burden of high priority climate sensitive diseases
Habitat determinants of goldenâheaded lion tamarin (Leontopithecus chrysomelas) occupancy of cacao agroforests: Gloomy conservation prospects for management intensification
Organismal distributions in humanâmodified landscapes largely depend on the capacity of any given species to adapt to changes in habitat structure and quality. The goldenâheaded 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 wildlifeâfriendly 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 largeâdiameter 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 rangeâwide distribution
Two randomised phase II trials of subcutaneous interleukin-2 and histamine dihydrochloride in patients with metastatic renal cell carcinoma
Histamine inhibits formation and release of phagocyte-derived reactive oxygen species, and thereby protects natural killer and T cells against oxidative damage. Thus, the addition of histamine may potentially improve the efficacy of interleukin-2 (IL-2). Two randomised phase II trials of IL-2 with or without histamine dihydrochloride (HDC) in patients with metastatic renal cell carcinoma (mRCC) were run in parallel. A total of 41 patients were included in Manchester, UK and 63 in Aarhus, Denmark. The self-administered, outpatient regimen included IL-2 as a fixed dose, 18 MIU s.c. once daily, 5 days per week for 3 weeks followed by 2 weeks rest. Histamine dihydrochloride was added twice daily, 1.0âmg s.c., concomitantly with IL-2. A maximum of four cycles were given. The Danish study showed a statistically significant 1-year survival benefit (76 vs 47%, P=0.03), a trend towards benefit in both median survival (18.3 vs 11.4 months, P=0.07), time to PD (4.5 vs 2.2 months, P=0.13) and clinical benefit (CR+PR+SD) (58 vs 37%, P=0.10) in favour of IL-2/HDC, whereas the UK study was negative for all end points. Only three patients had grade 4 toxicity; however, two were fatal. A randomised phase III trial is warranted to clarify the potential role of adding histamine to IL-2 in mRCC
Thermodynamic analysis of the Quantum Critical behavior of Ce-lattice compounds
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 () and entropy () results, three different types of
phase diagrams are recognized: i) with the entropy involved into the ordered
phase () decreasing proportionally to the ordering temperature
(), ii) those showing a transference of degrees of freedom from the
ordered phase to a non-magnetic component, with their jump
() vanishing at finite temperature, and iii) those ending in a
critical point at finite temperature because their do not decrease
with producing an entropy accumulation at low temperature.
Only those systems belonging to the first case, i.e. with as
, can be regarded as candidates for quantum critical behavior.
Their magnetic phase boundaries deviate from the classical negative curvature
below \,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 discontinuity strongly
affected by magnetic field and showing an increasing remnant entropy at . Physical constraints arising from the third law at are discussed
and recognized from experimental results
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