GEANT4 based Monte Carlo sim u la tions have been car ried out for the de ter mi na tion of ef fi ciency and con ver sion fac tors of a gas-flow ion iza tion cham ber for beta par ti cles emit ted by 86 dif fer ent ra dio iso topes cov er ing the av er age-b en ergy range of 5.69 keV-2.061 MeV. Good agree ments were found be tween the GEANT4 pre dicted val ues and cor re spond ing ex per i men ...

Evolutionary relationships among 48 genera of Apiaceae (Umbelliferae) were inferred using maximum parsimony, maximum-likelihood, and neighbor-joining analyses of chloroplast DNA rps16 intron and adjacent rps16 3′ exon sequences. Emphasis was placed on woody members of Apiaceae subfamily Apioideae endemic to southern Africa, a region hypothesized to be the place of origin of this largely herbace...

Real-time access to accurate and reliable timing information is necessary to profile scientific applications, and crucial as simulations become increasingly complex, adaptive, and large-scale. The Cactus Framework provides flexible and extensible capabilities for timing information through a well designed infrastructure and timing API. Applications built with Cactus automatically gain access to...

Let b be a Borel subalgebra of a simple Lie algebra g. LetAb denote the set of all Abelian ideals of b. It is easily seen that any a ∈Ab is actually contained in the nilpotent radical of b. Therefore a is determined by the the corresponding set of roots. More precisely, let t be a Cartan subalgebra of g lying in b and let ∆ be the root system of the pair (g, t). Choose the system of positive ro...

This article analyzes the consequences for risk distribution of the French Flood Prevention Action Programme (PAPI). By redirecting floods from the most vulnerable to the least vulnerable areas, PAPIs expose farmers to greater flood risks. This has led local water management institutions to introduce compensation payments. The article outlines the results of an exhaustive survey of all PAPIs in...

In this paper we present a web based tool for authoring adaptive assessments based on IMS QTI, IMS LIP and IEEE PAPI learning standards. The tool allows authors of assessments to customize the applied adaptation strategies to meet their own teaching experiences and goals. During the assessment procedure the system accumulates knowledge about learners and adapts the exposure of items based on th...

In this paper, we explore the impact of process placement on application performance when using an AMD Opteron bulldozer architecture CPU on a Cray XE6 node. We conduct a low-level analysis of possible resource contention on the Interlagos core modules using application kernels to exemplify target workloads. We will also characterize the performance of OpenMP threads in dual stream or packed mo...

In adaptive hypermedia systems, we distinguish AHAM as the most popular reference model which is based on the Dexter model. Our work consists on building an adaptive system following this model. In this paper, we deal both with the domain and the user’s model. On one hand, the domain model called Semantic Learning Model (SLM) is described taking into account the pedagogical structure resulting ...

Performance monitoring hardware is available on most modern microprocessors in the form of hardware counters and other registers that record data about processor events. This hardware may be used in counting mode, in which aggregate events counts are accumulated, and/or in sampling mode, in which time-based or event-based sampling is used to collect profiling data. This paper discusses uses of ...