Tucson, Arizona, United States

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    ABSTRACT: We describe a formation scenario of Enceladus constrained by the deuterium-to-hydrogen ratio (D/H) in the gas plumes as measured by the Cassini Ion and Neutral Mass Spectrometer. We propose that, similarly to Titan, Enceladus formed from icy planetesimals that were partly devolatilized during their migration within the Kronian subnebula. In our scenario, at least primordial Ar, CO, and N 2 were devolatilized from planetesimals during their drift within the subnebula, due to the increasing temperature and pressure conditions of the gas phase. The origin of methane is still uncertain since it might have been either trapped in the planetesimals of Enceladus during their formation in the solar nebula or produced via serpentinization reactions in the satellite's interior. If the methane of Enceladus originates from the solar nebula, then its D/H ratio should range between ∼4.7 × 10 −5 and 1.5 × 10 −4 . Moreover, Xe/H 2 O and Kr/H 2 O ratios are predicted to be equal to ∼7 × 10 −7 and 7 × 10 −6 , respectively, in the satellite's interior. On the other hand, if the methane of Enceladus results from serpentinization reactions, then its D/H ratio should range between ∼2.1 × 10 −4 and 4.5 × 10 −4 . In this case, Kr/H 2 O should not exceed ∼10 −10 and Xe/H 2 O should range between ∼1 × 10 −7 and 7 × 10 −7 in the satellite's interior. Future spacecraft missions, such as Titan Saturn System Mission, will have the capability to provide new insight into the origin of Enceladus by testing these observational predictions.
    The Astrophysical Journal 03/2016; 701(1):39-42. DOI:10.1088/0004-637X/701/1/L39;
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    ABSTRACT: Future crisis management systems needresilient and trustworthy infrastructures to quickly develop reliable applications and processes, andensure end-to-end security, trust, and privacy. Due to the multiplicity and diversity of involved actors, volumes of data, and heterogeneity of shared information;crisis management systems tend to be highly vulnerable and subjectto unforeseen incidents. As a result, the dependability of crisis management systems can be at risk. This paper presents a cloud-based resilient and trustworthy infrastructure (known as rDaaS) to quickly develop securecrisis management systems. The rDaaSintegrates the Dynamic Data-DrivenApplication Systems (DDDAS) paradigm into a service-oriented architectureover cloud technology andprovidesa set of resilient DDDAS-As-A Service (rDaaS)components to build secure and trusted adaptable crisis processes. The rDaaSalso ensures resilience and security by obfuscating the execution environment andapplying Behavior Software Encryption and Moving Technique Defense. A simulation environment for a nuclear plant crisis managementcase study is illustrated to build resilient and trusted crisis response processes.
    Procedia Computer Science 12/2015; 51(1):2623-2637. DOI:10.1016/j.procs.2015.05.370
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    ABSTRACT: Hippocampus has an extended developmental trajectory, with refinements occurring in the trisynaptic circuit until adolescence. While structural change should suggest a protracted course in behavior, some studies find evidence of precocious hippocampal development in the first postnatal year and continuity in memory processes beyond. However, a number of memory functions, including binding and relational inference, can be cortically supported. Evidence from the animal literature suggests that tasks often associated with hippocampus (visual paired comparison, binding of a visuomotor response) can be mediated by structures external to hippocampus. Thus, a complete examination of memory development will have to rule out cortex as a source of early memory competency. We propose that early memory must show properties associated with full function of the trisynaptic circuit to reflect "adult-like" memory function, mainly (1) rapid encoding of contextual details of overlapping patterns, and (2) retention of these details over sleep-dependent delays. A wealth of evidence suggests that these functions are not apparent until 18-24 months, with behavioral discontinuities reflecting shifts in the neural structures subserving memory beginning approximately at this point in development. We discuss the implications of these observations for theories of memory and for identifying and measuring memory function in populations with typical and atypical hippocampal function.
    Developmental Cognitive Neuroscience 09/2015; DOI:10.1016/j.dcn.2015.08.009


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    1118 E. Fourth Street (PAS 465), 85721, Tucson, Arizona, United States
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Top publications last week by reads

Science Advances 11/2015; 2015(1):1-9. DOI:10.1126/sciadv.1500561
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