3 research outputs found
Bilingual Researcher Profiles: Modeling Dutch Researchers in both English and Dutch Using the VIVO Ontology
<p>In this poster we describe the process of mapping researcher information from the Dutch National Academic Research and Collaborations Information System (NARCIS) to the VIVO ontology. Our goal is to use the VIVO ontology to accurately represent these researchers and their organizations, while remaining true to the native language and structure of the Dutch university. To achieve this, we first created an extension ontology to account for differences in the Dutch naming structure and differences in university position description and alignment. Secondly, through the use of language attribute tags, we recorded data in both English and Dutch to achieve better access by both the native Dutch population and the larger English based research community. Finally, we leveraged the SKOS ontology to take advantage of a classification structure, already created by NARCIS, to describe researcher expertise uniformly across the system. <em>Presented at ASIST 2013, Nov 1-6, Montreal, Canada</em></p
Determination of Mobile Ion Densities in Halide Perovskites via Low-Frequency Capacitance and Charge Extraction Techniques
Mobile ions in perovskite photovoltaic devices can hinder
performance
and cause degradation by impeding charge extraction and screening
the internal field. Accurately quantifying mobile ion densities remains
a challenge and is a highly debated topic. We assess the suitability
of several experimental methodologies for determining mobile ion densities
by using drift-diffusion simulations. We found that charge extraction
by linearly increasing voltage (CELIV) underestimates ion density,
but bias-assisted charge extraction (BACE) can accurately reproduce
ionic lower than the electrode charge. A modified MottâSchottky
(MS) analysis at low frequencies can provide ion density values for
high excess ionic densities, typical for perovskites. The most significant
contribution to capacitance originates from the ionic depletion layer
rather than the accumulation layer. Using low-frequency MS analysis,
we also demonstrate light-induced generation of mobile ions. These
methods enable accurate tracking of ionic densities during device
aging and a deeper understanding of ionic losses
Mass Spectrometry-Based Visualization of Molecules Associated with Human Habitats
The
cars we drive, the homes we live in, the restaurants we visit, and
the laboratories and offices we work in are all a part of the modern
human habitat. Remarkably, little is known about the diversity of
chemicals present in these environments and to what degree molecules
from our bodies influence the built environment that surrounds us
and vice versa. We therefore set out to visualize the chemical diversity
of five built human habitats together with their occupants, to provide
a snapshot of the various molecules to which humans are exposed on
a daily basis. The molecular inventory was obtained through untargeted
liquid chromatographyâtandem mass spectrometry (LCâMS/MS)
analysis of samples from each human habitat and from the people that
occupy those habitats. Mapping MS-derived data onto 3D models of the
environments showed that frequently touched surfaces, such as handles
(e.g., door, bicycle), resemble the molecular fingerprint of the human
skin more closely than other surfaces that are less frequently in
direct contact with humans (e.g., wall, bicycle frame). Approximately
50% of the MS/MS spectra detected were shared between people and the
environment. Personal care products, plasticizers, cleaning supplies,
food, food additives, and even medications that were found to be a
part of the human habitat. The annotations indicate that significant
transfer of chemicals takes place between us and our built environment.
The workflows applied here will lay the foundation for future studies
of molecular distributions in medical, forensic, architectural, space
exploration, and environmental applications