4,283 research outputs found
JANSEN, Martha Mabel Inventory of documents
No full textCOVERAGE 1915-1960; 192 Files; 4,33 Metres.
AUDIO CASSETTES IN ARCA COLLECTION = 6Private papers of M.M. Jansen, founder member of the Afrikaanse Taalbond in Natal and the first woman to become a member of the Academy for Language, Literature and Art. She was editor for the woman's section of Die Landbou Weekblad and columnist for Die Afrikaner [Natal] [1924], Deputy Leader of the National Party Natal [1933] and a founder member of the FAK and the Voortrekkerbeweging. Author of several publications
Fear the Machine?
No full textHealthCareHow do the technological changes caused by increased automation and A.I. affect workers�������� wages and jobs? This article summarizes PERC working paper 1801, PERC��������s Director Dennis W. Jansen and co-author Michael D. Bradley study the effects of automation and artificial intelligence on employment and labor income over multiple gen-erations
Inter-Jurisdiction Migration and the Fiscal Policies of Local Governments
No full textHealthCare|PublicFinanceThe relationship between migration and the economy is of great interest to researchers, especially where migration and local government fiscal policy intersect. In order to attract immigrants or retain current residents, how do local governments choose to spend, and how do they choose to finance their spending? This article summarizes PERC working paper 1901, where Dennis W. Jansen, PERC��������s director, and PERC Research Scientist Liqun Liu, along with co-author Darong Dai analyze the effects of non-tax/debt-driven migration on the fiscal policies of local governments using a two-period model of two identical local governments that are connected by mutual migration
‘A crooked, passion-laden mirror’: ‘Jews’ and ‘Muslims’ as a European question beyond religio-secularism
No full textIn this article, Jansen attempts to demonstrate that addressing the religious practices of Jews and Muslims from the perspective of a religio-secular framework in today’s European context underestimates the complexity of semiotic relations between Muslims, Jews and other Europeans. She discusses this complexity in terms of ‘intercultural semiotics’ between the three groups. In particular, she focuses on what she calls ‘mirroring relations’, drawing on an expression from Yirmiyahu Yovel about a ‘crooked, passion-laden mirror’ characterizing the ways in which modern Europeans imagined their Jewish neighbours in early twentieth-century Europe. In order to further explain this, Jansen analyses a passage from Marcel Proust’s novel In Search of Lost Time, which concerns a group of people in late nineteenth-century France, following the Dreyfus Affair, who are perceived by the narrator as Jewish. Thereafter, drawing on Gil Hochberg’s notion of the ‘re-membering’ of the Semite, Jansen analyses semiotic mirroring in the work Projet Deburkanisation (2017) by the Belgian author Rachida Lamrabet, which she reads as a contemporary meta-reflection, involving Muslims, on the mirroring relations between Jews and other Europeans first discussed via her reading of Proust
On the derivation of closed-form expressions for displacements, strains and stresses inside a poroelastic inclusion
No full textThis note provides the derivation of closed-form expressions for elastic displacements, strains, and stresses inside an inclusion. Jansen et al. (2019) and Wu et al. (2021) obtained correct expressions for the stresses inside an inclusion, but their derivation of these expressions contained mistakes. In this note, the correct derivation of expressions for the stresses inside an inclusion is presented and some of the results of the aforementioned studies are clarified.This note provides corrections to results published in: J.D. Jansen, P. Singhal, and F.C. Vossepoel. Insights from closed-form expressions for injection- and production-induced stresses in displaced faults. Journal of Geophysical Research - Solid Earth, 124:7193{7212, 2019. URL https://doi.org/10.1029/2019JB017932. H. Wu, V. Vilarrasa, S. De Simone, M. Saaltink, and F. Parisio. Analytical solution to assess the induced seismicity potential of faults in pressurized and depleted reservoirs. Journal of Geophysical Research - Solid Earth, 126: e2020JB020436, 2021. URL https://doi.org/10.1029/2020JB020436.Reservoir EngineeringMathematical PhysicsCivil Engineering & Geoscience
Prey tracking and predator avoidance in a Neotropical moist forest: a camera-trapping approach
No full textAbstract
Whether prey species avoid predators and predator species track prey is a poorly understood aspect of predator–prey interactions, given measuring prey tracking by predators and predator avoidance by prey is challenging. A common approach to study these interactions among mammals in field situations is to monitor the spatial proximity of animals at fixed times, using GPS tags fitted to individuals. However, this method is invasive and only allows tracking of a subset of individuals. Here, we use an alternative, noninvasive camera-trapping approach to monitor temporal proximity of predator and prey animals. We deployed camera traps at fixed locations on Barro Colorado Island, Panama, where the ocelot (Leopardus pardalis) is the principal mammalian predator, and tested two hypotheses: (1) prey animals avoid ocelots; and (2) ocelots track prey. We quantified temporal proximity of predators and prey by fitting parametric survival models to the time intervals between subsequent prey and predator captures by camera traps, and then compared the observed intervals to random permutations that retained the spatiotemporal distribution of animal activity. We found that time until a prey animal appeared at a location was significantly longer than expected by chance if an ocelot had passed, and that the time until an ocelot appeared at a location was significantly shorter than expected by chance after prey passage. These findings are indirect evidence for both predator avoidance and prey tracking in this system. Our results show that predator avoidance and prey tracking influence predator and prey distribution over time in a field setting. Moreover, this study demonstrates that camera trapping is a viable and noninvasive alternative to GPS tracking for studying certain predator–prey interactions
Phylogenetic revision of Minyomerus Horn, 1876 sec. Jansen & Franz, 2015 (Coleoptera, Curculionidae) using taxonomic concept annotations and alignments
No full textabstract: This contribution adopts the taxonomic concept annotation and alignment approach. Accordingly, and where indicated, previous and newly inferred meanings of taxonomic names are individuated according to one specific source. Articulations among these concepts and pairwise, logically consistent alignments of original and revisionary classifications are also provided, in addition to conventional nomenclatural provenance information. A phylogenetic revision of the broad-nosed weevil genera Minyomerus Horn, 1876 sec. O’Brien & Wibmer (1982), and Piscatopus Sleeper, 1960 sec. O’Brien & Wibmer (1982) (Curculionidae [non-focal]: Entiminae [non-focal]: Tanymecini [non-focal]) is presented. Prior to this study, Minyomerus sec. O’Brien & Wibmer (1982) contained seven species, whereas the monotypic Piscatopus sec. O’Brien & Wibmer (1982) was comprised solely of P. griseus Sleeper, 1960 sec. O’Brien & Wibmer (1982). We thoroughly redescribe these recognized species-level entities and furthermore describe ten species as new to science: M. bulbifrons sec. Jansen & Franz (2015) (henceforth: [JF2015]), sp. n., M. aeriballux [JF2015], sp. n., M. cracens [JF2015], sp. n., M. gravivultus [JF2015], sp. n., M. imberbus [JF2015], sp. n., M. reburrus [JF2015], sp. n., M. politus [JF2015], sp. n., M. puticulatus [JF2015], sp. n., M. rutellirostris [JF2015], sp. n., and M. trisetosus [JF2015], sp. n. A cladistic analysis using 46 morphological characters of 22 terminal taxa (5/17 outgroup/ingroup) yielded a single most-parsimonious cladogram (L = 82, CI = 65, RI = 82). The analysis strongly supports the monophyly of Minyomerus [JF2015] with eight unreversed synapomorphies, and places P. griseus sec. O’Brien & Wibmer (1982) within the genus as sister to M. rutellirostris [JF2015]. Accordingly, Piscatopus sec. Sleeper (1960), syn. n. is changed to junior synonymy of Minyomerus [JF2015], and its sole member P. griseus sec. Sleeper (1960) is moved to Minyomerus [JF2015] as M. griseus [JF2015], comb. n. In addition, the formerly designated type M. innocuus Horn, 1876 sec. Pierce (1913), syn. n. is changed to junior synonymy of M. microps (Say, 1831) [JF2015] which has priority. The genus is widespread throughout western North America, ranging from Canada to Mexico and Baja California. Apparent patterns of interspecific diversity of exterior and genitalic morphology, varying host plant ranges, overlapping and widely extending species distributions, suggest an early origin for Minyomerus [JF2015], with a diversification that likely followed the development of North American desert biomes. Three species in the genus – i.e., M. languidus Horn, 1876 [JF2015], M. microps [JF2015], and M. trisetosus [JF2015] – are putatively considered parthenogenetic.The final version of this article, as published in ZooKeys, can be viewed online at: https://zookeys.pensoft.net/articles.php?id=600
Consistent Regularization of Induced Coulomb Stresses in Displaced Faults
No full textThis note provides unregularized and regularized closed-form analytical expressions for the depletion-induced or injection-induced pre-slip Coulomb stresses in two-dimensional displaced dip-slip faults. The regularization serves to remove logarithmic singularities and jump-discontinuities in the unregularized formulation. The expressions are identical to those in Appendices A and B of Jansen & Meulenbroek (2022): Netherlands Journal of Geosciences 101 e13, except for the correction of a small error in the regularized formulation. In numerical examples the difference of the correction is hardly noticeable, but it ensures that the corrected formulation is internally consistent in the sense that integrals of stresses and pressure along a fault are identical for the unregularized and regularized expressions
Impact of COVID-19 on Physical Activity, Fatigue, and Frailty in Community-Dwelling Older Adults: A Cross-Sectional Study
No full textThe authors would like to thank Lien de Greve and Ann van den Eynde for review of and help with the data collection. This study was partly funded by an "Interdisciplinary Research Program" grant from the research council of the Vrije Universiteit Brussel (VUB), Belgium. Sponsor's role in the preparation of data or the manuscript: none. Members of the Gerontopole Brussels Study group include the following author groups: Frailty in Aging (FRIA) Research department, Vrije Universiteit Brussel (VUB): Ivan Bautmans. Belgian Aging Studies (BAST), Vrije Universiteit Brussel (VUB): Dominque Verte and Nico de Witte. Geriatric Medicine Department, Universitair Ziekenhuis Brussel: Ingo Beyer. ReFrail, UGent: Mirko Petrovic. Leerstoel Bevordering Active Aging, Vrije Universiteit Brussel (VUB): Tinie Kardol. Clinical and Lifespan Psychology KLEP, Vrije Universiteit Brussel (VUB): Gina Rossi. Physical Activity and Nutrition PANU, Vrije Universiteit Brussel (VUB): Peter Clarys. Experimental Anatomy EXAN, Vrije Universiteit Brussel (VUB): Aldo Scafoglieri and Erik Cattrysse. Fundamental Rights and Constitutionalism Research group FRC, Vrije Universiteit Brussel (VUB): Paul de Hert. Department of Electronics and Informatics ETRO, Vrije Universiteit Brussel (VUB): Bart Jansen
Scp160p is required for translational efficiency of codon-optimized mRNAs in yeast
No full textThe budding yeast multi-K homology domain RNA-binding protein Scp160p binds to > 1000 messenger RNAs (mRNAs) and polyribosomes, and its mammalian homolog vigilin binds transfer RNAs (tRNAs) and translation elongation factor EF1alpha. Despite its implication in translation, studies on Scp160p's molecular function are lacking to date. We applied translational profiling approaches and demonstrate that the association of a specific subset of mRNAs with ribosomes or heavy polysomes depends on Scp160p. Interaction of Scp160p with these mRNAs requires the conserved K homology domains 13 and 14. Transfer RNA pairing index analysis of Scp160p target mRNAs indicates a high degree of consecutive use of iso-decoding codons. As shown for one target mRNA encoding the glycoprotein Pry3p, Scp160p depletion results in translational downregulation but increased association with polysomes, suggesting that it is required for efficient translation elongation. Depletion of Scp160p also decreased the relative abundance of ribosome-associated tRNAs whose codons show low potential for autocorrelation on mRNAs. Conversely, tRNAs with highly autocorrelated codons in mRNAs are less impaired. Our data indicate that Scp160p might increase the efficiency of tRNA recharge, or prevent diffusion of discharged tRNAs, both of which were also proposed to be the likely basis for the translational fitness effect of tRNA pairing
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