1,690 research outputs found

    Short timescale behavior of colliding heavy nuclei at intermediate energies

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    An Antisymmetrized Molecular Dynamics model is used to explore the collision of 114^{114}Cd projectiles with 92^{92}Mo target nuclei at E/A=50 MeV over a broad range in impact parameter. The atomic number (Z), velocity, and emission pattern of the reaction products are examined as a function of the impact parameter and the cluster recognition time. The non-central collisions are found to be essentially binary in character resulting in the formation of an excited projectile-like fragment (PLF∗^*) and target-like fragment (TLF∗^*). The decay of these fragments occurs on a short timescale, 100≀\let≀\le300 fm/c. The average excitation energy deduced for the PLF∗^* and TLF∗^* `saturates for mid-central collisions, 3.5≀\leb≀\le6 fm, with its magnitude depending on the cluster recognition time. For short cluster recognition times (t=150 fm/c), an average excitation energy as high as ≈\approx6 MeV is predicted. Short timescale emission leads to a loss of initial correlations and results in features such as an anisotropic emission pattern of both IMFs and alpha particles emitted from the PLF∗^* and TLF∗^* in peripheral collisions.Comment: 19 pages, 17 figure

    The Burst Mode of Accretion in Primordial Star Formation

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    We present simulation results for the formation and long-term evolution of a primordial protostellar disk harbored by a first star. Using a 2+1D nonaxisymmetric thin disk numerical simulation, together with a barotropic relation for the gas, we are able to probe ~20 kyr of the disk's evolution. During this time period we observe fragmentation leading to loosely bound gaseous clumps within the disk. These are then torqued inward and accreted onto the growing protostar, giving rise to a burst phenomenon. The luminous feedback produced by this mechanism may have important consequences for the subsequent growth of the protostar.Comment: 3 pages, 2 figures, to appear in proceedings of First Stars IV meeting (Kyoto, Japan; 2012

    The Untitled Mapping Project: Case Study Trauma

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    This thesis is my personal exploration of what trauma is and how, if possible, it can be visually represented. The use of data collection, data visualization, and archive methodology is utilized in my project and this document examines how these components come together to understand trauma. This thesis also works through the ideology that everyone has the ability to experience trauma, of some form, in his or her life. Yet, there are different social perceptions for defining and labeling trauma. It is this social fallacy of trauma that I investigate and then seek to eliminate through the visual representation of trauma. Furthermore, this document examines how a visual representation is needed to understand that while everyone experience trauma differently, we should not distinguish traumas, but understand them all as just trauma

    Examining potential benefits and challenges associated with the Internet of Things integration in supply chains

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    Purpose The Internet of Things (IoT) is expected to have a huge impact on businesses and, especially, the way we think about supply chain management. However, there is still a paucity of studies on the impact of IoT adoption on supply chains and on different aspects of the business in general. The research aims to examine the perception of the academic community of the impact of the Internet of Things (IoT) adoption in organizational supply chains with a view to verify potential key benefits and challenges existent in the literature. The research presents the impact on an organization along with the impact across its entire supply chain. Design/methodology/approach Data was collected through the use of an online survey and 87 participants completed the survey. Participants were mainly from the academic community and were university scholars based in different countries located in six continents. Participants were authors, or co-authors, of academic papers published in the Decision Science Institute 2015 and 2016 annual conference proceedings, the 21st International Symposium of Sustainable Transport and Supply Chain Innovations, the Supply Chain Management : An International Journal 2016 issues, and the Operations and Supply Chain Management : an International Journal 2016 issues. Findings We were able to confirm the significance of some of the examined potential benefits to individual organizations and their entire supply chains. However, the study identified other potential benefits that were not seen as a direct impact of IoT adoption. Most of the examined potential benefits were found to contribute to a number of critical success factors for implementing successful supply chain management. We were also able to confirm that some of the examined potential challenges were still perceived as key hinders to IoT adoption but examined potential challenges were not seen as hurdles to IoT adoption. Originality/value To our best knowledge, this is the first study of its kind. Although some literature attempted to provide an overview about the IoT management, no study has specifically explored potential benefits and challenges related to the adoption of IoT in supply chains and ranked them based on their significance. The results can be beneficial to; academic scholars interested in the researched topic, business professionals, organizations within different sectors, and any other party interested in understanding more about the impact of adopting IoT on supply chain management

    Plasticity in Damaged Multisensory Networks

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    This chapter opens by discussing functional and anatomical locations as well as neural networks of unimodal senses: vision, somatosensation, audition, gustation and olfaction. How and where these unimodal sensory systems intersect and interact with multimodal sensory processes to provide a holistic view of how experiencing complex external objects and events lead to a single multimodal percept. Reviews of current neuropsychological research on damage occurring within both unimodal and multimodal sensory networks further explain the association between these networks and how they operate together in perception. Current research reviews on cross-modal plasticity reveal the neural changes that occur in multisensory areas following brain damage and the potential benefits of this plastic reorganization of the cortex

    A formação do conceito cientĂ­fico mediado pela produção escrita de gĂȘnero escolar-cientĂ­fico no currĂ­culo de quĂ­mica

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    Este artigo propĂ”e uma discussĂŁo sobre fundamentos da teoria da cognição na formação do conceito cientĂ­fico proposta por Vigotski e sua relação com aspectos da metalingĂŒĂ­stica proposta por Bakhtin, quando discute as esferas da atividade humana,as noçÔes de enunciado e seus aspectos intimamente ligados, o conteĂșdo temĂĄtico, o estilo e a construção composicional, conformando os gĂȘneros do discurso. As tipologias propostas por Schneuwly & Dolz adquirem importĂąncia relevante na construção dialĂłgica dos gĂȘneros do discurso escrita por estudantes e mediada por modelos padrĂŁo para introdução e aplicação no currĂ­culo formal de quĂ­mica no ensino mĂ©dio

    Deep convective clouds at the tropopause

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    Data from the Atmospheric Infrared Sounder (AIRS) on the EOS Aqua spacecraft each day show tens of thousands of Cold Clouds (CC) in the tropical oceans with 10 ÎŒm window channel brightness temperatures colder than 225 K. These clouds represent a mix of cold anvil clouds and Deep Convective Clouds (DCC). This mix can be separated by computing the difference between two channels, a window channel and a channel with strong CO<sub>2</sub> absorption: for some cold clouds this difference is negative, i.e. the spectra for some cold clouds are inverted. We refer to cold clouds with spectra which are more than 2 K inverted as DCCi2. Associated with DCCi2 is a very high rain rate and a local upward displacement of the tropopause, a cold "bulge", which can be seen directly in the brightness temperatures of AIRS and Advanced Microwave Sounding Unit (AMSU) temperature sounding channels in the lower stratosphere. The very high rain rate and the local distortion of the tropopause indicate that DCCi2 objects are associated with severe storms. Significant long-term trends in the statistical properties of DCCi2 could be interesting indicators of climate change. While the analysis of the nature and physical conditions related to DCCi2 requires hyperspectral infrared and microwave data, the identification of DCCi2 requires only one good window channel and one strong CO<sub>2</sub> sounding channel. This suggests that improved identification of severe storms with future advanced geostationary satellites could be accomplished with the addition of one or two narrow band channels
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