2,532 research outputs found
The decays h+- -> W-+ h0(a0) within an extension of the MSSM with one complex Higgs triplet
The vertex H+-W-+h0, involving the gauge bosons W-+, the charged (H+-) and
the lightest neutral (h0) Higgs bosons, arises within the context of many
extensions of the SM, and it can be used to probe the Higgs sector of such
extensions via the decay H+- -> W+- h0. We discuss the strength of this vertex
for an extension of the MSSM with an additional complex Higgs triplet. By using
this model, we find regions of the parameter space where the decay H+- -> W+-
h0 is not only kinematically allowed, but it also becomes an important decay
mode and in some cases the dominant one.Comment: 10 figure
Supporting teachers in collaborative student modeling: a framework and an implementation
Collaborative student modeling in adaptive learning environments allows the learners
to inspect and modify their own student models. It is often considered as a
collaboration between students and the system to promote learners’ reflection and
to collaboratively assess the course. When adaptive learning environments are used
in the classroom, teachers act as a guide through the learning process. Thus, they
need to monitor students’ interactions in order to understand and evaluate their
activities. Although, the knowledge gained through this monitorization can be extremely
useful to student modeling, collaboration between teachers and the system
to achieve this goal has not been considered in the literature. In this paper we
present a framework to support teachers in this task. In order to prove the usefulness
of this framework we have implemented and evaluated it in an adaptive
web-based educational system called PDinamet.Postprint (author's final draft
Gender Differences in Law Enforcement Leadership Style: Implications for Subordinate Job Satisfaction
Undergraduate
Applie
Fast determination of toxic diethylene glycol in toothpaste by ultra-performance liquid chromatography–time of flight mass spectrometry
A rapid method for determining diethylene
glycol (DEG) in toothpaste based on the use of ultraperformance
liquid chromatography (UPLC) coupled to
time-of-flight mass spectrometry (TOF-MS) has been
developed. The method has been validated in toothpaste
samples spiked at different levels, 0.005, 0.1 and 5%,
obtaining satisfactory recoveries (74–98%) and relative
standard deviations (<4%). Quantification was carried out
by using matrix-matched standards calibration. The developed
method was applied to several types of toothpaste,
making identification and quantification of DEG and other
polyethylene glycols (PEG) feasible with very little sample
manipulation, as only extraction with water is required. The
excellent sensitivity of TOF-MS analysis performed in fullscan
acquisition mode allowed the determination of DEG at
concentration levels as low as 0.005% in samples and its
reliable identification via the mass accuracy measurements
provided by this instrument (<5 ppm
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