3,645 research outputs found
Die betekenis van ds. Dirk Postma se bevordering van Christelike onderwys vir negentiende-eeuse Nederland en vir Suid-Afrika vandag
No full textThe Rev. Dirk Postma was not only the founder of the Reformed Church of South Africa (Gereformeerde Kerk), but also made significant contributions in the field of education. In this article the leading role he played with regard to the promotion of Christian education in the Netherlands (IH4H-1859) and in South Africa (1859-1890) is outlined. He was responsible for the establishment of the first Christian school in Zwolle and his dynamic involvement in education in South Africa had the result, among others, that the Potchefstroom University for Christian Higher Education came into being. His worthwhile activities in the sen’icc of Christian education are an example for present-day Christian educators in South Africa to tackle the educational problems which are rife at present and possibly to solve them in a like manner
Groeten uit...???
No full textIn elke editie wordt een studieverslag geplaatst van een B.I.L.-lid die een tijd in het buitenland studeert of heeft gestudeerd. Dit keer is het de beurt aan afgestudeerd masterstudent Wouter Postma. Wouter heeft het tweede semester in Zuid-Afrika gestudeerd
Carbon nanotube junctions and devices
No full textIn this thesis Postma presents transport experiments performed on individual single-wall carbon nanotubes. Carbon nanotubes are molecules entirely made of carbon atoms. The electronic properties are determined by the exact symmetry of the nanotube lattice, resulting in either metallic or semiconducting behaviour. Due to their small diameter, electronic motion is directed in the length direction of the nanotube, making them ideal systems to study e.g. one-dimensional transport phenomena. First, we present mK-temperature current-voltage characteristics of an individual single-wall carbon nanotube showing Coulomb blockade and resonant tunnelling through individual molecular levels. We then report electrical transport measurements on carbon nanotubes with naturally occurring intramolecular junctions. We find that a metal-semiconductor junction behaves like a rectifying diode, whereas the conductance of a metal-metal junction behaves like a tunnel junction with associated power-law dependencies described by a Luttinger liquid model for tunnelling between the two nanotube segments. In order to further study carbon nanotube intramolecular junctions, we developed an atomic force microscope (AFM) manipulation technique, by means of which carbon nanotube junctions such as buckles and crossings are created. The electronic transport properties of these manipulated structures show that they form electronic nanometer-size tunnel junctions. Thereafter, room-temperature single-electron transistors are realized within metallic carbon nanotubes. The devices feature a short (down to 20 nm) nanotube section that is created by AFM manipulation. Coulomb charging is observed at room temperature. We observe unconventional power-law dependencies in the transport properties for which we develop a resonant-tunnelling Luttinger-liquid model. Finally, the low-frequency electronic noise properties of metallic carbon nanotubes are investigated. The noise power exhibits a 1/f frequency dependence that is three orders of magnitude smaller at 8 K than at 300 K. As a demonstration of how these noise properties affect nanotube devices, we present a preliminary investigation of the noise characteristics of an intramolecular carbon nanotube single-electron transistor.Applied Science
Updated healthcare cost estimate for drug-related hepatitis C infections in the European Union
No full textThe era of our lives: The memory of Korsakoff patients for the first Covid-19 pandemic lockdown in the Netherlands
No full textMemories for worldwide and emotional events (such as 9/11) are more vividly relived and recalled than memories for everyday events. Previous studies have shown that flashbulb memories of a single event enhanced the memory strength in severe amnesia. It is currently unknown whether macro-events that stretch out over longer periods of time (weeks, months) strengthen memory even further. Our aim was therefore to investigate to what extent patients with severe amnesia, due to Korsakoff’s syndrome (KS), were able to relive the first Covid-19 lockdown in the Netherlands, and whether experienced emotions enhanced reliving of the participants. We included 22 KS patients and 24 age-, education-, and gender-matched healthy controls. Covid-19 related memories were assessed by measures of autobiographical memory specificity, phenomenological reliving, emotional intensity and semantic-and episodic knowledge about the first lockdown in March 2020 – May 2020 in the Netherlands. Although amnesia patients remembered significantly fewer autobiographical details regarding the Covid-19 lockdown than healthy controls, one fourth of the KS patients recalled specific events. Amnesia patients reported levels of emotional intensity equivalent to those in the control group. Stronger autobiographical reliving was associated with higher emotional intensity. Both amnesia patients and healthy controls had higher recall of episodic than semantic lockdown related information. In conclusion, results demonstrate that information for macro-events can still be memorized and relived, most specifically when emotional valence is high, even by highly amnestic patients
Updated healthcare cost estimate for drug-related hepatitis C infections in the European Union
No full textJubileum Theologiese Skool, 1869-1919 : wat gaan ons doen? / deur W. Postma
No full textDie kommissie, deur die weleerw. here Kuratore benoemd in verband met die aanstaande Jubileum van de Theol. Skool, het onder meer 'n opdrag om 'n boekie uit te gee, waarin belangstelling opgewek word vir de saak van onse Skool, met die oog op die voorgestelde Jubileum-kolekte. Die kommissie gee hierbij gevolg aan sijn opdragen wens meteen te meld, dat aan alle gemeentes gedruk lijste uitgestuur is, waarop die gemeentelede gelieve aan te teken die bedrag, wat hul vir die jubilee-fonds gaan sonder.- Lees, en laat lees, en help
Health economics of infectious diseases
No full textWelte R, Leidl R, Greiner W, Postma M. Health Economics of Infectious Diseases. In: Krämer A, Kretzschmar M, Krickeberg K, eds. Modern Infectious Disease Epidemiology: Concepts, Methods, Mathematical Models And Public Health. Statistics for Biology and Health. New York: Springer; 2010: 249-275
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